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Diffstat (limited to 'drivers/opus/http.c')
| -rw-r--r-- | drivers/opus/http.c | 3391 |
1 files changed, 3391 insertions, 0 deletions
diff --git a/drivers/opus/http.c b/drivers/opus/http.c new file mode 100644 index 0000000000..803db044af --- /dev/null +++ b/drivers/opus/http.c @@ -0,0 +1,3391 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE libopusfile SOFTWARE CODEC SOURCE CODE. * + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * + * * + * THE libopusfile SOURCE CODE IS (C) COPYRIGHT 2012 * + * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * + * * + ********************************************************************/ +#ifdef OPUS_HAVE_CONFIG_H +#include "opus_config.h" +#endif + +#include "internal.h" +#include <ctype.h> +#include <errno.h> +#include <limits.h> +#include <string.h> + +/*RFCs referenced in this file: + RFC 761: DOD Standard Transmission Control Protocol + RFC 1535: A Security Problem and Proposed Correction With Widely Deployed DNS + Software + RFC 1738: Uniform Resource Locators (URL) + RFC 1945: Hypertext Transfer Protocol -- HTTP/1.0 + RFC 2068: Hypertext Transfer Protocol -- HTTP/1.1 + RFC 2145: Use and Interpretation of HTTP Version Numbers + RFC 2246: The TLS Protocol Version 1.0 + RFC 2459: Internet X.509 Public Key Infrastructure Certificate and + Certificate Revocation List (CRL) Profile + RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1 + RFC 2617: HTTP Authentication: Basic and Digest Access Authentication + RFC 2817: Upgrading to TLS Within HTTP/1.1 + RFC 2818: HTTP Over TLS + RFC 3492: Punycode: A Bootstring encoding of Unicode for Internationalized + Domain Names in Applications (IDNA) + RFC 3986: Uniform Resource Identifier (URI): Generic Syntax + RFC 3987: Internationalized Resource Identifiers (IRIs) + RFC 4343: Domain Name System (DNS) Case Insensitivity Clarification + RFC 5894: Internationalized Domain Names for Applications (IDNA): + Background, Explanation, and Rationale + RFC 6066: Transport Layer Security (TLS) Extensions: Extension Definitions + RFC 6125: Representation and Verification of Domain-Based Application Service + Identity within Internet Public Key Infrastructure Using X.509 (PKIX) + Certificates in the Context of Transport Layer Security (TLS) + RFC 6555: Happy Eyeballs: Success with Dual-Stack Hosts*/ + +typedef struct OpusParsedURL OpusParsedURL; +typedef struct OpusStringBuf OpusStringBuf; +typedef struct OpusHTTPConn OpusHTTPConn; +typedef struct OpusHTTPStream OpusHTTPStream; + +static char *op_string_range_dup(const char *_start,const char *_end){ + size_t len; + char *ret; + OP_ASSERT(_start<=_end); + len=_end-_start; + /*This is to help avoid overflow elsewhere, later.*/ + if(OP_UNLIKELY(len>=INT_MAX))return NULL; + ret=(char *)_ogg_malloc(sizeof(*ret)*(len+1)); + if(OP_LIKELY(ret!=NULL)){ + ret=(char *)memcpy(ret,_start,sizeof(*ret)*(len)); + ret[len]='\0'; + } + return ret; +} + +static char *op_string_dup(const char *_s){ + return op_string_range_dup(_s,_s+strlen(_s)); +} + +static char *op_string_tolower(char *_s){ + int i; + for(i=0;_s[i]!='\0';i++){ + int c; + c=_s[i]; + if(c>='A'&&c<='Z')c+='a'-'A'; + _s[i]=(char)c; + } + return _s; +} + +/*URI character classes (from RFC 3986).*/ +#define OP_URL_ALPHA \ + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" +#define OP_URL_DIGIT "0123456789" +#define OP_URL_HEXDIGIT "0123456789ABCDEFabcdef" +/*Not a character class, but the characters allowed in <scheme>.*/ +#define OP_URL_SCHEME OP_URL_ALPHA OP_URL_DIGIT "+-." +#define OP_URL_GEN_DELIMS "#/:?@[]" +#define OP_URL_SUB_DELIMS "!$&'()*+,;=" +#define OP_URL_RESERVED OP_URL_GEN_DELIMS OP_URL_SUB_DELIMS +#define OP_URL_UNRESERVED OP_URL_ALPHA OP_URL_DIGIT "-._~" +/*Not a character class, but the characters allowed in <pct-encoded>.*/ +#define OP_URL_PCT_ENCODED "%" +/*Not a character class or production rule, but for convenience.*/ +#define OP_URL_PCHAR_BASE \ + OP_URL_UNRESERVED OP_URL_PCT_ENCODED OP_URL_SUB_DELIMS +#define OP_URL_PCHAR OP_URL_PCHAR_BASE ":@" +/*Not a character class, but the characters allowed in <userinfo> and + <IP-literal>.*/ +#define OP_URL_PCHAR_NA OP_URL_PCHAR_BASE ":" +/*Not a character class, but the characters allowed in <segment-nz-nc>.*/ +#define OP_URL_PCHAR_NC OP_URL_PCHAR_BASE "@" +/*Not a character clsss, but the characters allowed in <path>.*/ +#define OP_URL_PATH OP_URL_PCHAR "/" +/*Not a character class, but the characters allowed in <query> / <fragment>.*/ +#define OP_URL_QUERY_FRAG OP_URL_PCHAR "/?" + +/*Check the <% HEXDIG HEXDIG> escapes of a URL for validity. + Return: 0 if valid, or a negative value on failure.*/ +static int op_validate_url_escapes(const char *_s){ + int i; + for(i=0;_s[i];i++){ + if(_s[i]=='%'){ + if(OP_UNLIKELY(!isxdigit(_s[i+1])) + ||OP_UNLIKELY(!isxdigit(_s[i+2])) + /*RFC 3986 says %00 "should be rejected if the application is not + expecting to receive raw data within a component."*/ + ||OP_UNLIKELY(_s[i+1]=='0'&&_s[i+2]=='0')){ + return OP_FALSE; + } + i+=2; + } + } + return 0; +} + +/*Convert a hex digit to its actual value. + _c: The hex digit to convert. + Presumed to be valid ('0'...'9', 'A'...'F', or 'a'...'f'). + Return: The value of the digit, in the range [0,15].*/ +static int op_hex_value(int _c){ + return _c>='a'?_c-'a'+10:_c>='A'?_c-'A'+10:_c-'0'; +} + +/*Unescape all the <% HEXDIG HEXDIG> sequences in a string in-place. + This does no validity checking.*/ +static char *op_unescape_url_component(char *_s){ + int i; + int j; + for(i=j=0;_s[i];i++,j++){ + if(_s[i]=='%'){ + _s[i]=(char)(op_hex_value(_s[i+1])<<4|op_hex_value(_s[i+2])); + i+=2; + } + } + return _s; +} + +/*Parse a file: URL. + This code is not meant to be fast: strspn() with large sets is likely to be + slow, but it is very convenient. + It is meant to be RFC 1738-compliant (as updated by RFC 3986).*/ +static const char *op_parse_file_url(const char *_src){ + const char *scheme_end; + const char *path; + const char *path_end; + scheme_end=_src+strspn(_src,OP_URL_SCHEME); + if(OP_UNLIKELY(*scheme_end!=':') + ||scheme_end-_src!=4||op_strncasecmp(_src,"file",4)!=0){ + /*Unsupported protocol.*/ + return NULL; + } + /*Make sure all escape sequences are valid to simplify unescaping later.*/ + if(OP_UNLIKELY(op_validate_url_escapes(scheme_end+1)<0))return NULL; + if(scheme_end[1]=='/'&&scheme_end[2]=='/'){ + const char *host; + /*file: URLs can have a host! + Yeah, I was surprised, too, but that's what RFC 1738 says. + It also says, "The file URL scheme is unusual in that it does not specify + an Internet protocol or access method for such files; as such, its + utility in network protocols between hosts is limited," which is a mild + understatement.*/ + host=scheme_end+3; + /*The empty host is what we expect.*/ + if(OP_LIKELY(*host=='/'))path=host; + else{ + const char *host_end; + char host_buf[28]; + /*RFC 1738 says localhost "is interpreted as `the machine from which the + URL is being interpreted,'" so let's check for it.*/ + host_end=host+strspn(host,OP_URL_PCHAR_BASE); + /*No <port> allowed. + This also rejects IP-Literals.*/ + if(*host_end!='/')return NULL; + /*An escaped "localhost" can take at most 27 characters.*/ + if(OP_UNLIKELY(host_end-host>27))return NULL; + memcpy(host_buf,host,sizeof(*host_buf)*(host_end-host)); + host_buf[host_end-host]='\0'; + op_unescape_url_component(host_buf); + op_string_tolower(host_buf); + /*Some other host: give up.*/ + if(OP_UNLIKELY(strcmp(host_buf,"localhost")!=0))return NULL; + path=host_end; + } + } + else path=scheme_end+1; + path_end=path+strspn(path,OP_URL_PATH); + /*This will reject a <query> or <fragment> component, too. + I don't know what to do with queries, but a temporal fragment would at + least make sense. + RFC 1738 pretty clearly defines a <searchpart> that's equivalent to the + RFC 3986 <query> component for other schemes, but not the file: scheme, + so I'm going to just reject it.*/ + if(*path_end!='\0')return NULL; + return path; +} + +#if defined(OP_ENABLE_HTTP) +# if defined(_WIN32) +# include <winsock2.h> +# include <ws2tcpip.h> +# include <openssl/ssl.h> +# include "winerrno.h" + +typedef SOCKET op_sock; + +# define OP_INVALID_SOCKET (INVALID_SOCKET) + +/*Vista and later support WSAPoll(), but we don't want to rely on that. + Instead we re-implement it badly using select(). + Unfortunately, they define a conflicting struct pollfd, so we only define our + own if it looks like that one has not already been defined.*/ +# if !defined(POLLIN) +/*Equivalent to POLLIN.*/ +# define POLLRDNORM (0x0100) +/*Priority band data can be read.*/ +# define POLLRDBAND (0x0200) +/*There is data to read.*/ +# define POLLIN (POLLRDNORM|POLLRDBAND) +/* There is urgent data to read.*/ +# define POLLPRI (0x0400) +/*Equivalent to POLLOUT.*/ +# define POLLWRNORM (0x0010) +/*Writing now will not block.*/ +# define POLLOUT (POLLWRNORM) +/*Priority data may be written.*/ +# define POLLWRBAND (0x0020) +/*Error condition (output only).*/ +# define POLLERR (0x0001) +/*Hang up (output only).*/ +# define POLLHUP (0x0002) +/*Invalid request: fd not open (output only).*/ +# define POLLNVAL (0x0004) + +struct pollfd{ + /*File descriptor.*/ + op_sock fd; + /*Requested events.*/ + short events; + /*Returned events.*/ + short revents; +}; +# endif + +/*But Winsock never defines nfds_t (it's simply hard-coded to ULONG).*/ +typedef unsigned long nfds_t; + +/*The usage of FD_SET() below is O(N^2). + This is okay because select() is limited to 64 sockets in Winsock, anyway. + In practice, we only ever call it with one or two sockets.*/ +static int op_poll_win32(struct pollfd *_fds,nfds_t _nfds,int _timeout){ + struct timeval tv; + fd_set ifds; + fd_set ofds; + fd_set efds; + nfds_t i; + int ret; + FD_ZERO(&ifds); + FD_ZERO(&ofds); + FD_ZERO(&efds); + for(i=0;i<_nfds;i++){ + _fds[i].revents=0; + if(_fds[i].events&POLLIN)FD_SET(_fds[i].fd,&ifds); + if(_fds[i].events&POLLOUT)FD_SET(_fds[i].fd,&ofds); + FD_SET(_fds[i].fd,&efds); + } + if(_timeout>=0){ + tv.tv_sec=_timeout/1000; + tv.tv_usec=(_timeout%1000)*1000; + } + ret=select(-1,&ifds,&ofds,&efds,_timeout<0?NULL:&tv); + if(ret>0){ + for(i=0;i<_nfds;i++){ + if(FD_ISSET(_fds[i].fd,&ifds))_fds[i].revents|=POLLIN; + if(FD_ISSET(_fds[i].fd,&ofds))_fds[i].revents|=POLLOUT; + /*This isn't correct: there are several different things that might have + happened to a fd in efds, but I don't know a good way to distinguish + them without more context from the caller. + It's okay, because we don't actually check any of these bits, we just + need _some_ bit set.*/ + if(FD_ISSET(_fds[i].fd,&efds))_fds[i].revents|=POLLHUP; + } + } + return ret; +} + +/*We define op_errno() to make it clear that it's not an l-value like normal + errno is.*/ +# define op_errno() (WSAGetLastError()?WSAGetLastError()-WSABASEERR:0) +# define op_reset_errno() (WSASetLastError(0)) + +/*The remaining functions don't get an op_ prefix even though they only + operate on sockets, because we don't use non-socket I/O here, and this + minimizes the changes needed to deal with Winsock.*/ +# define close(_fd) closesocket(_fd) +/*This relies on sizeof(u_long)==sizeof(int), which is always true on both + Win32 and Win64.*/ +# define ioctl(_fd,_req,_arg) ioctlsocket(_fd,_req,(u_long *)(_arg)) +# define getsockopt(_fd,_level,_name,_val,_len) \ + getsockopt(_fd,_level,_name,(char *)(_val),_len) +# define setsockopt(_fd,_level,_name,_val,_len) \ + setsockopt(_fd,_level,_name,(const char *)(_val),_len) +# define poll(_fds,_nfds,_timeout) op_poll_win32(_fds,_nfds,_timeout) + +# if defined(_MSC_VER) +typedef ptrdiff_t ssize_t; +# endif + +/*Load certificates from the built-in certificate store.*/ +int SSL_CTX_set_default_verify_paths_win32(SSL_CTX *_ssl_ctx); +# define SSL_CTX_set_default_verify_paths \ + SSL_CTX_set_default_verify_paths_win32 + +# else +/*Normal Berkeley sockets.*/ +# include <sys/ioctl.h> +# include <sys/types.h> +# include <sys/socket.h> +# include <arpa/inet.h> +# include <netinet/in.h> +# include <netinet/tcp.h> +# include <fcntl.h> +# include <netdb.h> +# include <poll.h> +# include <unistd.h> +# include <openssl/ssl.h> + +typedef int op_sock; + +# define OP_INVALID_SOCKET (-1) + +# define op_errno() (errno) +# define op_reset_errno() (errno=0) + +# endif +# include <sys/timeb.h> +# include <openssl/x509v3.h> + +/*The maximum number of simultaneous connections. + RFC 2616 says this SHOULD NOT be more than 2, but everyone on the modern web + ignores that (e.g., IE 8 bumped theirs up from 2 to 6, Firefox uses 15). + If it makes you feel better, we'll only ever actively read from one of these + at a time. + The others are kept around mainly to avoid slow-starting a new connection + when seeking, and time out rapidly.*/ +# define OP_NCONNS_MAX (4) + +/*The amount of time before we attempt to re-resolve the host. + This is 10 minutes, as recommended in RFC 6555 for expiring cached connection + results for dual-stack hosts.*/ +# define OP_RESOLVE_CACHE_TIMEOUT_MS (10*60*(opus_int32)1000) + +/*The number of redirections at which we give up. + The value here is the current default in Firefox. + RFC 2068 mandated a maximum of 5, but RFC 2616 relaxed that to "a client + SHOULD detect infinite redirection loops." + Fortunately, 20 is less than infinity.*/ +# define OP_REDIRECT_LIMIT (20) + +/*The initial size of the buffer used to read a response message (before the + body).*/ +# define OP_RESPONSE_SIZE_MIN (510) +/*The maximum size of a response message (before the body). + Responses larger than this will be discarded. + I've seen a real server return 20 kB of data for a 302 Found response. + Increasing this beyond 32kB will cause problems on platforms with a 16-bit + int.*/ +# define OP_RESPONSE_SIZE_MAX (32766) + +/*The number of milliseconds we will allow a connection to sit idle before we + refuse to resurrect it. + Apache as of 2.2 has reduced its default timeout to 5 seconds (from 15), so + that's what we'll use here.*/ +# define OP_CONNECTION_IDLE_TIMEOUT_MS (5*1000) + +/*The number of milliseconds we will wait to send or receive data before giving + up.*/ +# define OP_POLL_TIMEOUT_MS (30*1000) + +/*We will always attempt to read ahead at least this much in preference to + opening a new connection.*/ +# define OP_READAHEAD_THRESH_MIN (32*(opus_int32)1024) + +/*The amount of data to request after a seek. + This is a trade-off between read throughput after a seek vs. the the ability + to quickly perform another seek with the same connection.*/ +# define OP_PIPELINE_CHUNK_SIZE (32*(opus_int32)1024) +/*Subsequent chunks are requested with larger and larger sizes until they pass + this threshold, after which we just ask for the rest of the resource.*/ +# define OP_PIPELINE_CHUNK_SIZE_MAX (1024*(opus_int32)1024) +/*This is the maximum number of requests we'll make with a single connection. + Many servers will simply disconnect after we attempt some number of requests, + possibly without sending a Connection: close header, meaning we won't + discover it until we try to read beyond the end of the current chunk. + We can reconnect when that happens, but this is slow. + Instead, we impose a limit ourselves (set to the default for Apache + installations and thus likely the most common value in use).*/ +# define OP_PIPELINE_MAX_REQUESTS (100) +/*This should be the number of requests, starting from a chunk size of + OP_PIPELINE_CHUNK_SIZE and doubling each time, until we exceed + OP_PIPELINE_CHUNK_SIZE_MAX and just request the rest of the file. + We won't reuse a connection when seeking unless it has at least this many + requests left, to reduce the chances we'll have to open a new connection + while reading forward afterwards.*/ +# define OP_PIPELINE_MIN_REQUESTS (7) + +/*Is this an https URL? + For now we can simply check the last letter of the scheme.*/ +# define OP_URL_IS_SSL(_url) ((_url)->scheme[4]=='s') + +/*Does this URL use the default port for its scheme?*/ +# define OP_URL_IS_DEFAULT_PORT(_url) \ + (!OP_URL_IS_SSL(_url)&&(_url)->port==80 \ + ||OP_URL_IS_SSL(_url)&&(_url)->port==443) + +struct OpusParsedURL{ + /*Either "http" or "https".*/ + char *scheme; + /*The user name from the <userinfo> component, or NULL.*/ + char *user; + /*The password from the <userinfo> component, or NULL.*/ + char *pass; + /*The <host> component. + This may not be NULL.*/ + char *host; + /*The <path> and <query> components. + This may not be NULL.*/ + char *path; + /*The <port> component. + This is set to the default port if the URL did not contain one.*/ + unsigned port; +}; + +/*Parse a URL. + This code is not meant to be fast: strspn() with large sets is likely to be + slow, but it is very convenient. + It is meant to be RFC 3986-compliant. + We currently do not support IRIs (Internationalized Resource Identifiers, + RFC 3987). + Callers should translate them to URIs first.*/ +static int op_parse_url_impl(OpusParsedURL *_dst,const char *_src){ + const char *scheme_end; + const char *authority; + const char *userinfo_end; + const char *user; + const char *user_end; + const char *pass; + const char *hostport; + const char *hostport_end; + const char *host_end; + const char *port; + opus_int32 port_num; + const char *port_end; + const char *path; + const char *path_end; + const char *uri_end; + scheme_end=_src+strspn(_src,OP_URL_SCHEME); + if(OP_UNLIKELY(*scheme_end!=':') + ||OP_UNLIKELY(scheme_end-_src<4)||OP_UNLIKELY(scheme_end-_src>5) + ||OP_UNLIKELY(op_strncasecmp(_src,"https",scheme_end-_src)!=0)){ + /*Unsupported protocol.*/ + return OP_EIMPL; + } + if(OP_UNLIKELY(scheme_end[1]!='/')||OP_UNLIKELY(scheme_end[2]!='/')){ + /*We require an <authority> component.*/ + return OP_EINVAL; + } + authority=scheme_end+3; + /*Make sure all escape sequences are valid to simplify unescaping later.*/ + if(OP_UNLIKELY(op_validate_url_escapes(authority)<0))return OP_EINVAL; + /*Look for a <userinfo> component.*/ + userinfo_end=authority+strspn(authority,OP_URL_PCHAR_NA); + if(*userinfo_end=='@'){ + /*Found one.*/ + user=authority; + /*Look for a password (yes, clear-text passwords are deprecated, I know, + but what else are people supposed to use? use SSL if you care).*/ + user_end=authority+strspn(authority,OP_URL_PCHAR_BASE); + if(*user_end==':')pass=user_end+1; + else pass=NULL; + hostport=userinfo_end+1; + } + else{ + /*We shouldn't have to initialize user_end, but gcc is too dumb to figure + out that user!=NULL below means we didn't take this else branch.*/ + user=user_end=NULL; + pass=NULL; + hostport=authority; + } + /*Try to figure out where the <host> component ends.*/ + if(hostport[0]=='['){ + hostport++; + /*We have an <IP-literal>, which can contain colons.*/ + hostport_end=host_end=hostport+strspn(hostport,OP_URL_PCHAR_NA); + if(OP_UNLIKELY(*hostport_end++!=']'))return OP_EINVAL; + } + /*Currently we don't support IDNA (RFC 5894), because I don't want to deal + with the policy about which domains should not be internationalized to + avoid confusing similarities. + Give this API Punycode (RFC 3492) domain names instead.*/ + else hostport_end=host_end=hostport+strspn(hostport,OP_URL_PCHAR_BASE); + /*TODO: Validate host.*/ + /*Is there a port number?*/ + port_num=-1; + if(*hostport_end==':'){ + int i; + port=hostport_end+1; + port_end=port+strspn(port,OP_URL_DIGIT); + path=port_end; + /*Not part of RFC 3986, but require port numbers in the range 0...65535.*/ + if(OP_LIKELY(port_end-port>0)){ + while(*port=='0')port++; + if(OP_UNLIKELY(port_end-port>5))return OP_EINVAL; + port_num=0; + for(i=0;i<port_end-port;i++)port_num=port_num*10+port[i]-'0'; + if(OP_UNLIKELY(port_num>65535))return OP_EINVAL; + } + } + else path=hostport_end; + path_end=path+strspn(path,OP_URL_PATH); + /*If the path is not empty, it must begin with a '/'.*/ + if(OP_LIKELY(path_end>path)&&OP_UNLIKELY(path[0]!='/'))return OP_EINVAL; + /*Consume the <query> component, if any (right now we don't split this out + from the <path> component).*/ + if(*path_end=='?')path_end=path_end+strspn(path_end,OP_URL_QUERY_FRAG); + /*Discard the <fragment> component, if any. + This doesn't get sent to the server. + Some day we should add support for Media Fragment URIs + <http://www.w3.org/TR/media-frags/>.*/ + if(*path_end=='#')uri_end=path_end+1+strspn(path_end+1,OP_URL_QUERY_FRAG); + else uri_end=path_end; + /*If there's anything left, this was not a valid URL.*/ + if(OP_UNLIKELY(*uri_end!='\0'))return OP_EINVAL; + _dst->scheme=op_string_range_dup(_src,scheme_end); + if(OP_UNLIKELY(_dst->scheme==NULL))return OP_EFAULT; + op_string_tolower(_dst->scheme); + if(user!=NULL){ + _dst->user=op_string_range_dup(user,user_end); + if(OP_UNLIKELY(_dst->user==NULL))return OP_EFAULT; + op_unescape_url_component(_dst->user); + /*Unescaping might have created a ':' in the username. + That's not allowed by RFC 2617's Basic Authentication Scheme.*/ + if(OP_UNLIKELY(strchr(_dst->user,':')!=NULL))return OP_EINVAL; + } + else _dst->user=NULL; + if(pass!=NULL){ + _dst->pass=op_string_range_dup(pass,userinfo_end); + if(OP_UNLIKELY(_dst->pass==NULL))return OP_EFAULT; + op_unescape_url_component(_dst->pass); + } + else _dst->pass=NULL; + _dst->host=op_string_range_dup(hostport,host_end); + if(OP_UNLIKELY(_dst->host==NULL))return OP_EFAULT; + if(port_num<0){ + if(_src[4]=='s')port_num=443; + else port_num=80; + } + _dst->port=(unsigned)port_num; + /*RFC 2616 says an empty <abs-path> component is equivalent to "/", and we + MUST use the latter in the Request-URI. + Reserve space for the slash here.*/ + if(path==path_end||path[0]=='?')path--; + _dst->path=op_string_range_dup(path,path_end); + if(OP_UNLIKELY(_dst->path==NULL))return OP_EFAULT; + /*And force-set it here.*/ + _dst->path[0]='/'; + return 0; +} + +static void op_parsed_url_init(OpusParsedURL *_url){ + memset(_url,0,sizeof(*_url)); +} + +static void op_parsed_url_clear(OpusParsedURL *_url){ + _ogg_free(_url->scheme); + _ogg_free(_url->user); + _ogg_free(_url->pass); + _ogg_free(_url->host); + _ogg_free(_url->path); +} + +static int op_parse_url(OpusParsedURL *_dst,const char *_src){ + OpusParsedURL url; + int ret; + op_parsed_url_init(&url); + ret=op_parse_url_impl(&url,_src); + if(OP_UNLIKELY(ret<0))op_parsed_url_clear(&url); + else *_dst=*&url; + return ret; +} + +/*A buffer to hold growing strings. + The main purpose of this is to consolidate allocation checks and simplify + cleanup on a failed allocation.*/ +struct OpusStringBuf{ + char *buf; + int nbuf; + int cbuf; +}; + +static void op_sb_init(OpusStringBuf *_sb){ + _sb->buf=NULL; + _sb->nbuf=0; + _sb->cbuf=0; +} + +static void op_sb_clear(OpusStringBuf *_sb){ + _ogg_free(_sb->buf); +} + +/*Make sure we have room for at least _capacity characters (plus 1 more for the + terminating NUL).*/ +static int op_sb_ensure_capacity(OpusStringBuf *_sb,int _capacity){ + char *buf; + int cbuf; + buf=_sb->buf; + cbuf=_sb->cbuf; + if(_capacity>=cbuf-1){ + if(OP_UNLIKELY(cbuf>INT_MAX-1>>1))return OP_EFAULT; + if(OP_UNLIKELY(_capacity>=INT_MAX-1))return OP_EFAULT; + cbuf=OP_MAX(2*cbuf+1,_capacity+1); + buf=_ogg_realloc(buf,sizeof(*buf)*cbuf); + if(OP_UNLIKELY(buf==NULL))return OP_EFAULT; + _sb->buf=buf; + _sb->cbuf=cbuf; + } + return 0; +} + +/*Increase the capacity of the buffer, but not to more than _max_size + characters (plus 1 more for the terminating NUL).*/ +static int op_sb_grow(OpusStringBuf *_sb,int _max_size){ + char *buf; + int cbuf; + buf=_sb->buf; + cbuf=_sb->cbuf; + OP_ASSERT(_max_size<=INT_MAX-1); + cbuf=cbuf<=_max_size-1>>1?2*cbuf+1:_max_size+1; + buf=_ogg_realloc(buf,sizeof(*buf)*cbuf); + if(OP_UNLIKELY(buf==NULL))return OP_EFAULT; + _sb->buf=buf; + _sb->cbuf=cbuf; + return 0; +} + +static int op_sb_append(OpusStringBuf *_sb,const char *_s,int _len){ + char *buf; + int nbuf; + int ret; + nbuf=_sb->nbuf; + if(OP_UNLIKELY(nbuf>INT_MAX-_len))return OP_EFAULT; + ret=op_sb_ensure_capacity(_sb,nbuf+_len); + if(OP_UNLIKELY(ret<0))return ret; + buf=_sb->buf; + memcpy(buf+nbuf,_s,sizeof(*buf)*_len); + nbuf+=_len; + buf[nbuf]='\0'; + _sb->nbuf=nbuf; + return 0; +} + +static int op_sb_append_string(OpusStringBuf *_sb,const char *_s){ + return op_sb_append(_sb,_s,strlen(_s)); +} + +static int op_sb_append_port(OpusStringBuf *_sb,unsigned _port){ + char port_buf[7]; + OP_ASSERT(_port<=65535U); + sprintf(port_buf,":%u",_port); + return op_sb_append_string(_sb,port_buf); +} + +static int op_sb_append_nonnegative_int64(OpusStringBuf *_sb,opus_int64 _i){ + char digit; + int nbuf_start; + int ret; + OP_ASSERT(_i>=0); + nbuf_start=_sb->nbuf; + ret=0; + do{ + digit='0'+_i%10; + ret|=op_sb_append(_sb,&digit,1); + _i/=10; + } + while(_i>0); + if(OP_LIKELY(ret>=0)){ + char *buf; + int nbuf_end; + buf=_sb->buf; + nbuf_end=_sb->nbuf-1; + /*We've added the digits backwards. + Reverse them.*/ + while(nbuf_start<nbuf_end){ + digit=buf[nbuf_start]; + buf[nbuf_start]=buf[nbuf_end]; + buf[nbuf_end]=digit; + nbuf_start++; + nbuf_end--; + } + } + return ret; +} + +static struct addrinfo *op_resolve(const char *_host,unsigned _port){ + struct addrinfo *addrs; + struct addrinfo hints; + char service[6]; + memset(&hints,0,sizeof(hints)); + hints.ai_socktype=SOCK_STREAM; +#if !defined(_WIN32) + hints.ai_flags=AI_NUMERICSERV; +#endif + OP_ASSERT(_port<=65535U); + sprintf(service,"%u",_port); + if(OP_LIKELY(!getaddrinfo(_host,service,&hints,&addrs)))return addrs; + return NULL; +} + +static int op_sock_set_nonblocking(op_sock _fd,int _nonblocking){ +#if !defined(_WIN32) + int flags; + flags=fcntl(_fd,F_GETFL); + if(OP_UNLIKELY(flags<0))return flags; + if(_nonblocking)flags|=O_NONBLOCK; + else flags&=~O_NONBLOCK; + return fcntl(_fd,F_SETFL,flags); +#else + return ioctl(_fd,FIONBIO,&_nonblocking); +#endif +} + +/*Disable/enable write coalescing if we can. + We always send whole requests at once and always parse the response headers + before sending another one, so normally write coalescing just causes added + delay.*/ +static void op_sock_set_tcp_nodelay(op_sock _fd,int _nodelay){ +# if defined(TCP_NODELAY)&&(defined(IPPROTO_TCP)||defined(SOL_TCP)) +# if defined(IPPROTO_TCP) +# define OP_SO_LEVEL IPPROTO_TCP +# else +# define OP_SO_LEVEL SOL_TCP +# endif + /*It doesn't really matter if this call fails, but it would be interesting + to hit a case where it does.*/ + OP_ALWAYS_TRUE(!setsockopt(_fd,OP_SO_LEVEL,TCP_NODELAY, + &_nodelay,sizeof(_nodelay))); +# endif +} + +#if defined(_WIN32) +static void op_init_winsock(){ + static LONG count; + static WSADATA wsadata; + if(InterlockedIncrement(&count)==1)WSAStartup(0x0202,&wsadata); +} +#endif + +/*A single physical connection to an HTTP server. + We may have several of these open at once.*/ +struct OpusHTTPConn{ + /*The current position indicator for this connection.*/ + opus_int64 pos; + /*The position where the current request will end, or -1 if we're reading + until EOF (an unseekable stream or the initial HTTP/1.0 request).*/ + opus_int64 end_pos; + /*The position where next request we've sent will start, or -1 if we haven't + sent the next request yet.*/ + opus_int64 next_pos; + /*The end of the next request or -1 if we requested the rest of the resource. + This is only set to a meaningful value if next_pos is not -1.*/ + opus_int64 next_end; + /*The SSL connection, if this is https.*/ + SSL *ssl_conn; + /*The next connection in either the LRU or free list.*/ + OpusHTTPConn *next; + /*The last time we blocked for reading from this connection.*/ + struct timeb read_time; + /*The number of bytes we've read since the last time we blocked.*/ + opus_int64 read_bytes; + /*The estimated throughput of this connection, in bytes/s.*/ + opus_int64 read_rate; + /*The socket we're reading from.*/ + op_sock fd; + /*The number of remaining requests we are allowed on this connection.*/ + int nrequests_left; + /*The chunk size to use for pipelining requests.*/ + opus_int32 chunk_size; +}; + +static void op_http_conn_init(OpusHTTPConn *_conn){ + _conn->next_pos=-1; + _conn->ssl_conn=NULL; + _conn->next=NULL; + _conn->fd=OP_INVALID_SOCKET; +} + +static void op_http_conn_clear(OpusHTTPConn *_conn){ + if(_conn->ssl_conn!=NULL)SSL_free(_conn->ssl_conn); + /*SSL frees the BIO for us.*/ + if(_conn->fd!=OP_INVALID_SOCKET)close(_conn->fd); +} + +/*The global stream state.*/ +struct OpusHTTPStream{ + /*The list of connections.*/ + OpusHTTPConn conns[OP_NCONNS_MAX]; + /*The context object used as a framework for TLS/SSL functions.*/ + SSL_CTX *ssl_ctx; + /*The cached session to reuse for future connections.*/ + SSL_SESSION *ssl_session; + /*The LRU list (ordered from MRU to LRU) of currently connected + connections.*/ + OpusHTTPConn *lru_head; + /*The free list.*/ + OpusHTTPConn *free_head; + /*The URL to connect to.*/ + OpusParsedURL url; + /*Information about the address we connected to.*/ + struct addrinfo addr_info; + /*The address we connected to.*/ + union{ + struct sockaddr s; + struct sockaddr_in v4; + struct sockaddr_in6 v6; + } addr; + /*The last time we re-resolved the host.*/ + struct timeb resolve_time; + /*A buffer used to build HTTP requests.*/ + OpusStringBuf request; + /*A buffer used to build proxy CONNECT requests.*/ + OpusStringBuf proxy_connect; + /*A buffer used to receive the response headers.*/ + OpusStringBuf response; + /*The Content-Length, if specified, or -1 otherwise. + This will always be specified for seekable streams.*/ + opus_int64 content_length; + /*The position indicator used when no connection is active.*/ + opus_int64 pos; + /*The host we actually connected to.*/ + char *connect_host; + /*The port we actually connected to.*/ + unsigned connect_port; + /*The connection we're currently reading from. + This can be -1 if no connection is active.*/ + int cur_conni; + /*Whether or not the server supports range requests.*/ + int seekable; + /*Whether or not the server supports HTTP/1.1 with persistent connections.*/ + int pipeline; + /*Whether or not we should skip certificate checks.*/ + int skip_certificate_check; + /*The offset of the tail of the request. + Only the offset in the Range: header appears after this, allowing us to + quickly edit the request to ask for a new range.*/ + int request_tail; + /*The estimated time required to open a new connection, in milliseconds.*/ + opus_int32 connect_rate; +}; + +static void op_http_stream_init(OpusHTTPStream *_stream){ + OpusHTTPConn **pnext; + int ci; + pnext=&_stream->free_head; + for(ci=0;ci<OP_NCONNS_MAX;ci++){ + op_http_conn_init(_stream->conns+ci); + *pnext=_stream->conns+ci; + pnext=&_stream->conns[ci].next; + } + _stream->ssl_ctx=NULL; + _stream->ssl_session=NULL; + _stream->lru_head=NULL; + op_parsed_url_init(&_stream->url); + op_sb_init(&_stream->request); + op_sb_init(&_stream->proxy_connect); + op_sb_init(&_stream->response); + _stream->connect_host=NULL; + _stream->seekable=0; +} + +/*Close the connection and move it to the free list. + _stream: The stream containing the free list. + _conn: The connection to close. + _penxt: The linked-list pointer currently pointing to this connection. + _gracefully: Whether or not to shut down cleanly.*/ +static void op_http_conn_close(OpusHTTPStream *_stream,OpusHTTPConn *_conn, + OpusHTTPConn **_pnext,int _gracefully){ + /*If we don't shut down gracefully, the server MUST NOT re-use our session + according to RFC 2246, because it can't tell the difference between an + abrupt close and a truncation attack. + So we shut down gracefully if we can. + However, we will not wait if this would block (it's not worth the savings + from session resumption to do so). + Clients (that's us) MAY resume a TLS session that ended with an incomplete + close, according to RFC 2818, so there's no reason to make sure the server + shut things down gracefully.*/ + if(_gracefully&&_conn->ssl_conn!=NULL)SSL_shutdown(_conn->ssl_conn); + op_http_conn_clear(_conn); + _conn->next_pos=-1; + _conn->ssl_conn=NULL; + _conn->fd=OP_INVALID_SOCKET; + OP_ASSERT(*_pnext==_conn); + *_pnext=_conn->next; + _conn->next=_stream->free_head; + _stream->free_head=_conn; +} + +static void op_http_stream_clear(OpusHTTPStream *_stream){ + while(_stream->lru_head!=NULL){ + op_http_conn_close(_stream,_stream->lru_head,&_stream->lru_head,0); + } + if(_stream->ssl_session!=NULL)SSL_SESSION_free(_stream->ssl_session); + if(_stream->ssl_ctx!=NULL)SSL_CTX_free(_stream->ssl_ctx); + op_sb_clear(&_stream->response); + op_sb_clear(&_stream->proxy_connect); + op_sb_clear(&_stream->request); + if(_stream->connect_host!=_stream->url.host)_ogg_free(_stream->connect_host); + op_parsed_url_clear(&_stream->url); +} + +static int op_http_conn_write_fully(OpusHTTPConn *_conn, + const char *_buf,int _buf_size){ + struct pollfd fd; + SSL *ssl_conn; + fd.fd=_conn->fd; + ssl_conn=_conn->ssl_conn; + while(_buf_size>0){ + int err; + if(ssl_conn!=NULL){ + int ret; + ret=SSL_write(ssl_conn,_buf,_buf_size); + if(ret>0){ + /*Wrote some data.*/ + _buf+=ret; + _buf_size-=ret; + continue; + } + /*Connection closed.*/ + else if(ret==0)return OP_FALSE; + err=SSL_get_error(ssl_conn,ret); + /*Yes, renegotiations can cause SSL_write() to block for reading.*/ + if(err==SSL_ERROR_WANT_READ)fd.events=POLLIN; + else if(err==SSL_ERROR_WANT_WRITE)fd.events=POLLOUT; + else return OP_FALSE; + } + else{ + ssize_t ret; + op_reset_errno(); + ret=send(fd.fd,_buf,_buf_size,0); + if(ret>0){ + _buf+=ret; + _buf_size-=ret; + continue; + } + err=op_errno(); + if(err!=EAGAIN&&err!=EWOULDBLOCK)return OP_FALSE; + fd.events=POLLOUT; + } + if(poll(&fd,1,OP_POLL_TIMEOUT_MS)<=0)return OP_FALSE; + } + return 0; +} + +static int op_http_conn_estimate_available(OpusHTTPConn *_conn){ + int available; + int ret; + ret=ioctl(_conn->fd,FIONREAD,&available); + if(ret<0)available=0; + /*This requires the SSL read_ahead flag to be unset to work. + We ignore partial records as well as the protocol overhead for any pending + bytes. + This means we might return somewhat less than can truly be read without + blocking (if there's a partial record). + This is okay, because we're using this value to estimate network transfer + time, and we _have_ already received those bytes. + We also might return slightly more (due to protocol overhead), but that's + small enough that it probably doesn't matter.*/ + if(_conn->ssl_conn!=NULL)available+=SSL_pending(_conn->ssl_conn); + return available; +} + +static opus_int32 op_time_diff_ms(const struct timeb *_end, + const struct timeb *_start){ + opus_int64 dtime; + dtime=_end->time-(opus_int64)_start->time; + OP_ASSERT(_end->millitm<1000); + OP_ASSERT(_start->millitm<1000); + if(OP_UNLIKELY(dtime>(OP_INT32_MAX-1000)/1000))return OP_INT32_MAX; + if(OP_UNLIKELY(dtime<(OP_INT32_MIN+1000)/1000))return OP_INT32_MIN; + return (opus_int32)dtime*1000+_end->millitm-_start->millitm; +} + +/*Update the read rate estimate for this connection.*/ +static void op_http_conn_read_rate_update(OpusHTTPConn *_conn){ + struct timeb read_time; + opus_int32 read_delta_ms; + opus_int64 read_delta_bytes; + opus_int64 read_rate; + read_delta_bytes=_conn->read_bytes; + if(read_delta_bytes<=0)return; + ftime(&read_time); + read_delta_ms=op_time_diff_ms(&read_time,&_conn->read_time); + read_rate=_conn->read_rate; + read_delta_ms=OP_MAX(read_delta_ms,1); + read_rate+=read_delta_bytes*1000/read_delta_ms-read_rate+4>>3; + *&_conn->read_time=*&read_time; + _conn->read_bytes=0; + _conn->read_rate=read_rate; +} + +/*Tries to read from the given connection. + [out] _buf: Returns the data read. + _buf_size: The size of the buffer. + _blocking: Whether or not to block until some data is retrieved. + Return: A positive number of bytes read on success. + 0: The read would block, or the connection was closed. + OP_EREAD: There was a fatal read error.*/ +static int op_http_conn_read(OpusHTTPConn *_conn, + char *_buf,int _buf_size,int _blocking){ + struct pollfd fd; + SSL *ssl_conn; + int nread; + int nread_unblocked; + fd.fd=_conn->fd; + ssl_conn=_conn->ssl_conn; + nread=nread_unblocked=0; + /*RFC 2818 says "client implementations MUST treat any premature closes as + errors and the data received as potentially truncated," so we make very + sure to report read errors upwards.*/ + do{ + int err; + if(ssl_conn!=NULL){ + int ret; + ret=SSL_read(ssl_conn,_buf+nread,_buf_size-nread); + OP_ASSERT(ret<=_buf_size-nread); + if(ret>0){ + /*Read some data. + Keep going to see if there's more.*/ + nread+=ret; + nread_unblocked+=ret; + continue; + } + /*If we already read some data, return it right now.*/ + if(nread>0)break; + err=SSL_get_error(ssl_conn,ret); + if(ret==0){ + /*Connection close. + Check for a clean shutdown to prevent truncation attacks. + This check always succeeds for SSLv2, as it has no "close notify" + message and thus can't verify an orderly shutdown.*/ + return err==SSL_ERROR_ZERO_RETURN?0:OP_EREAD; + } + if(err==SSL_ERROR_WANT_READ)fd.events=POLLIN; + /*Yes, renegotiations can cause SSL_read() to block for writing.*/ + else if(err==SSL_ERROR_WANT_WRITE)fd.events=POLLOUT; + /*Some other error.*/ + else return OP_EREAD; + } + else{ + ssize_t ret; + op_reset_errno(); + ret=recv(fd.fd,_buf+nread,_buf_size-nread,0); + OP_ASSERT(ret<=_buf_size-nread); + if(ret>0){ + /*Read some data. + Keep going to see if there's more.*/ + nread+=ret; + nread_unblocked+=ret; + continue; + } + /*If we already read some data or the connection was closed, return + right now.*/ + if(ret==0||nread>0)break; + err=op_errno(); + if(err!=EAGAIN&&err!=EWOULDBLOCK)return OP_EREAD; + fd.events=POLLIN; + } + _conn->read_bytes+=nread_unblocked; + op_http_conn_read_rate_update(_conn); + nread_unblocked=0; + if(!_blocking)break; + /*Need to wait to get any data at all.*/ + if(poll(&fd,1,OP_POLL_TIMEOUT_MS)<=0)return OP_EREAD; + } + while(nread<_buf_size); + _conn->read_bytes+=nread_unblocked; + return nread; +} + +/*Tries to look at the pending data for a connection without consuming it. + [out] _buf: Returns the data at which we're peeking. + _buf_size: The size of the buffer.*/ +static int op_http_conn_peek(OpusHTTPConn *_conn,char *_buf,int _buf_size){ + struct pollfd fd; + SSL *ssl_conn; + int ret; + fd.fd=_conn->fd; + ssl_conn=_conn->ssl_conn; + for(;;){ + int err; + if(ssl_conn!=NULL){ + ret=SSL_peek(ssl_conn,_buf,_buf_size); + /*Either saw some data or the connection was closed.*/ + if(ret>=0)return ret; + err=SSL_get_error(ssl_conn,ret); + if(err==SSL_ERROR_WANT_READ)fd.events=POLLIN; + /*Yes, renegotiations can cause SSL_peek() to block for writing.*/ + else if(err==SSL_ERROR_WANT_WRITE)fd.events=POLLOUT; + else return 0; + } + else{ + op_reset_errno(); + ret=(int)recv(fd.fd,_buf,_buf_size,MSG_PEEK); + /*Either saw some data or the connection was closed.*/ + if(ret>=0)return ret; + err=op_errno(); + if(err!=EAGAIN&&err!=EWOULDBLOCK)return 0; + fd.events=POLLIN; + } + /*Need to wait to get any data at all.*/ + if(poll(&fd,1,OP_POLL_TIMEOUT_MS)<=0)return 0; + } +} + +/*When parsing response headers, RFC 2616 mandates that all lines end in CR LF. + However, even in the year 2012, I have seen broken servers use just a LF. + This is the evil that Postel's advice from RFC 761 breeds.*/ + +/*Reads the entirety of a response to an HTTP request into the response buffer. + Actual parsing and validation is done later. + Return: The number of bytes in the response on success, OP_EREAD if the + connection was closed before reading any data, or another negative + value on any other error.*/ +static int op_http_conn_read_response(OpusHTTPConn *_conn, + OpusStringBuf *_response){ + int ret; + _response->nbuf=0; + ret=op_sb_ensure_capacity(_response,OP_RESPONSE_SIZE_MIN); + if(OP_UNLIKELY(ret<0))return ret; + for(;;){ + char *buf; + int size; + int capacity; + int read_limit; + int terminated; + size=_response->nbuf; + capacity=_response->cbuf-1; + if(OP_UNLIKELY(size>=capacity)){ + ret=op_sb_grow(_response,OP_RESPONSE_SIZE_MAX); + if(OP_UNLIKELY(ret<0))return ret; + capacity=_response->cbuf-1; + /*The response was too large. + This prevents a bad server from running us out of memory.*/ + if(OP_UNLIKELY(size>=capacity))return OP_EIMPL; + } + buf=_response->buf; + ret=op_http_conn_peek(_conn,buf+size,capacity-size); + if(OP_UNLIKELY(ret<=0))return size<=0?OP_EREAD:OP_FALSE; + /*We read some data.*/ + /*Make sure the starting characters are "HTTP". + Otherwise we could wind up waiting forever for a response from + something that is not an HTTP server.*/ + if(size<4&&op_strncasecmp(buf,"HTTP",OP_MIN(size+ret,4))!=0){ + return OP_FALSE; + } + /*How far can we read without passing the "\r\n\r\n" terminator?*/ + buf[size+ret]='\0'; + terminated=0; + for(read_limit=OP_MAX(size-3,0);read_limit<size+ret;read_limit++){ + /*We don't look for the leading '\r' thanks to broken servers.*/ + if(buf[read_limit]=='\n'){ + if(buf[read_limit+1]=='\r'&&OP_LIKELY(buf[read_limit+2]=='\n')){ + terminated=3; + break; + } + /*This case is for broken servers.*/ + else if(OP_UNLIKELY(buf[read_limit+1]=='\n')){ + terminated=2; + break; + } + } + } + read_limit+=terminated; + OP_ASSERT(size<=read_limit); + OP_ASSERT(read_limit<=size+ret); + /*Actually consume that data.*/ + ret=op_http_conn_read(_conn,buf+size,read_limit-size,1); + if(OP_UNLIKELY(ret<=0))return OP_FALSE; + size+=ret; + buf[size]='\0'; + _response->nbuf=size; + /*We found the terminator and read all the data up to and including it.*/ + if(terminated&&OP_LIKELY(size>=read_limit))return size; + } + return OP_EIMPL; +} + +# define OP_HTTP_DIGIT "0123456789" + +/*The Reason-Phrase is not allowed to contain control characters, except + horizontal tab (HT: \011).*/ +# define OP_HTTP_CREASON_PHRASE \ + "\001\002\003\004\005\006\007\010\012\013\014\015\016\017\020\021" \ + "\022\023\024\025\026\027\030\031\032\033\034\035\036\037\177" + +# define OP_HTTP_CTLS \ + "\001\002\003\004\005\006\007\010\011\012\013\014\015\016\017\020" \ + "\021\022\023\024\025\026\027\030\031\032\033\034\035\036\037\177" + +/*This also includes '\t', but we get that from OP_HTTP_CTLS.*/ +# define OP_HTTP_SEPARATORS " \"(),/:;<=>?@[\\]{}" + +/*TEXT can also include LWS, but that has structure, so we parse it + separately.*/ +# define OP_HTTP_CTOKEN OP_HTTP_CTLS OP_HTTP_SEPARATORS + +/*Return: The amount of linear white space (LWS) at the start of _s.*/ +static int op_http_lwsspn(const char *_s){ + int i; + for(i=0;;){ + if(_s[0]=='\r'&&_s[1]=='\n'&&(_s[2]=='\t'||_s[2]==' '))i+=3; + /*This case is for broken servers.*/ + else if(_s[0]=='\n'&&(_s[1]=='\t'||_s[1]==' '))i+=2; + else if(_s[i]=='\t'||_s[i]==' ')i++; + else return i; + } +} + +static char *op_http_parse_status_line(int *_v1_1_compat, + char **_status_code,char *_response){ + char *next; + char *status_code; + int v1_1_compat; + size_t d; + /*RFC 2616 Section 6.1 does not say that the tokens in the Status-Line cannot + be separated by optional LWS, but since it specifically calls out where + spaces are to be placed and that CR and LF are not allowed except at the + end, I am assuming this to be true.*/ + /*We already validated that this starts with "HTTP"*/ + OP_ASSERT(op_strncasecmp(_response,"HTTP",4)==0); + next=_response+4; + if(OP_UNLIKELY(*next++!='/'))return NULL; + d=strspn(next,OP_HTTP_DIGIT); + /*"Leading zeros MUST be ignored by recipients."*/ + while(*next=='0'){ + next++; + OP_ASSERT(d>0); + d--; + } + /*We only support version 1.x*/ + if(OP_UNLIKELY(d!=1)||OP_UNLIKELY(*next++!='1'))return NULL; + if(OP_UNLIKELY(*next++!='.'))return NULL; + d=strspn(next,OP_HTTP_DIGIT); + if(OP_UNLIKELY(d<=0))return NULL; + /*"Leading zeros MUST be ignored by recipients."*/ + while(*next=='0'){ + next++; + OP_ASSERT(d>0); + d--; + } + /*We don't need to parse the version number. + Any non-zero digit means it's greater than 1.*/ + v1_1_compat=d>0; + next+=d; + if(OP_UNLIKELY(*next++!=' '))return NULL; + status_code=next; + d=strspn(next,OP_HTTP_DIGIT); + if(OP_UNLIKELY(d!=3))return NULL; + next+=d; + /*The Reason-Phrase can be empty, but the space must be here.*/ + if(OP_UNLIKELY(*next++!=' '))return NULL; + next+=strcspn(next,OP_HTTP_CREASON_PHRASE); + /*We are not mandating this be present thanks to broken servers.*/ + if(OP_LIKELY(*next=='\r'))next++; + if(OP_UNLIKELY(*next++!='\n'))return NULL; + if(_v1_1_compat!=NULL)*_v1_1_compat=v1_1_compat; + *_status_code=status_code; + return next; +} + +/*Get the next response header. + [out] _header: The header token, NUL-terminated, with leading and trailing + whitespace stripped, and converted to lower case (to simplify + case-insensitive comparisons), or NULL if there are no more + response headers. + [out] _cdr: The remaining contents of the header, excluding the initial + colon (':') and the terminating CRLF ("\r\n"), + NUL-terminated, and with leading and trailing whitespace + stripped, or NULL if there are no more response headers. + [inout] _s: On input, this points to the start of the current line of the + response headers. + On output, it points to the start of the first line following + this header, or NULL if there are no more response headers. + Return: 0 on success, or a negative value on failure.*/ +static int op_http_get_next_header(char **_header,char **_cdr,char **_s){ + char *header; + char *header_end; + char *cdr; + char *cdr_end; + char *next; + size_t d; + next=*_s; + /*The second case is for broken servers.*/ + if(next[0]=='\r'&&next[1]=='\n'||OP_UNLIKELY(next[0]=='\n')){ + /*No more headers.*/ + *_header=NULL; + *_cdr=NULL; + *_s=NULL; + return 0; + } + header=next+op_http_lwsspn(next); + d=strcspn(header,OP_HTTP_CTOKEN); + if(OP_UNLIKELY(d<=0))return OP_FALSE; + header_end=header+d; + next=header_end+op_http_lwsspn(header_end); + if(OP_UNLIKELY(*next++!=':'))return OP_FALSE; + next+=op_http_lwsspn(next); + cdr=next; + do{ + cdr_end=next+strcspn(next,OP_HTTP_CTLS); + next=cdr_end+op_http_lwsspn(cdr_end); + } + while(next>cdr_end); + /*We are not mandating this be present thanks to broken servers.*/ + if(OP_LIKELY(*next=='\r'))next++; + if(OP_UNLIKELY(*next++!='\n'))return OP_FALSE; + *header_end='\0'; + *cdr_end='\0'; + /*Field names are case-insensitive.*/ + op_string_tolower(header); + *_header=header; + *_cdr=cdr; + *_s=next; + return 0; +} + +static opus_int64 op_http_parse_nonnegative_int64(const char **_next, + const char *_cdr){ + const char *next; + opus_int64 ret; + int i; + next=_cdr+strspn(_cdr,OP_HTTP_DIGIT); + *_next=next; + if(OP_UNLIKELY(next<=_cdr))return OP_FALSE; + while(*_cdr=='0')_cdr++; + if(OP_UNLIKELY(next-_cdr>19))return OP_EIMPL; + ret=0; + for(i=0;i<next-_cdr;i++){ + int digit; + digit=_cdr[i]-'0'; + /*Check for overflow.*/ + if(OP_UNLIKELY(ret>(OP_INT64_MAX-9)/10+(digit<=7)))return OP_EIMPL; + ret=ret*10+digit; + } + return ret; +} + +static opus_int64 op_http_parse_content_length(const char *_cdr){ + const char *next; + opus_int64 content_length; + content_length=op_http_parse_nonnegative_int64(&next,_cdr); + if(OP_UNLIKELY(*next!='\0'))return OP_FALSE; + return content_length; +} + +static int op_http_parse_content_range(opus_int64 *_first,opus_int64 *_last, + opus_int64 *_length,const char *_cdr){ + opus_int64 first; + opus_int64 last; + opus_int64 length; + size_t d; + if(OP_UNLIKELY(op_strncasecmp(_cdr,"bytes",5)!=0))return OP_FALSE; + _cdr+=5; + d=op_http_lwsspn(_cdr); + if(OP_UNLIKELY(d<=0))return OP_FALSE; + _cdr+=d; + if(*_cdr!='*'){ + first=op_http_parse_nonnegative_int64(&_cdr,_cdr); + if(OP_UNLIKELY(first<0))return (int)first; + _cdr+=op_http_lwsspn(_cdr); + if(*_cdr++!='-')return OP_FALSE; + _cdr+=op_http_lwsspn(_cdr); + last=op_http_parse_nonnegative_int64(&_cdr,_cdr); + if(OP_UNLIKELY(last<0))return (int)last; + _cdr+=op_http_lwsspn(_cdr); + } + else{ + /*This is for a 416 response (Requested range not satisfiable).*/ + first=last=-1; + _cdr++; + } + if(OP_UNLIKELY(*_cdr++!='/'))return OP_FALSE; + if(*_cdr!='*'){ + length=op_http_parse_nonnegative_int64(&_cdr,_cdr); + if(OP_UNLIKELY(length<0))return (int)length; + } + else{ + /*The total length is unspecified.*/ + _cdr++; + length=-1; + } + if(OP_UNLIKELY(*_cdr!='\0'))return OP_FALSE; + if(OP_UNLIKELY(last<first))return OP_FALSE; + if(length>=0&&OP_UNLIKELY(last>=length))return OP_FALSE; + *_first=first; + *_last=last; + *_length=length; + return 0; +} + +/*Parse the Connection response header and look for a "close" token. + Return: 1 if a "close" token is found, 0 if it's not found, and a negative + value on error.*/ +static int op_http_parse_connection(char *_cdr){ + size_t d; + int ret; + ret=0; + for(;;){ + d=strcspn(_cdr,OP_HTTP_CTOKEN); + if(OP_UNLIKELY(d<=0))return OP_FALSE; + if(op_strncasecmp(_cdr,"close",(int)d)==0)ret=1; + /*We're supposed to strip and ignore any headers mentioned in the + Connection header if this response is from an HTTP/1.0 server (to + work around forwarding of hop-by-hop headers by old proxies), but the + only hop-by-hop header we look at is Connection itself. + Everything else is a well-defined end-to-end header, and going back and + undoing the things we did based on already-examined headers would be + hard (since we only scan them once, in a destructive manner). + Therefore we just ignore all the other tokens.*/ + _cdr+=d; + d=op_http_lwsspn(_cdr); + if(d<=0)break; + _cdr+=d; + } + return OP_UNLIKELY(*_cdr!='\0')?OP_FALSE:ret; +} + +typedef int (*op_ssl_step_func)(SSL *_ssl_conn); + +/*Try to run an SSL function to completion (blocking if necessary).*/ +static int op_do_ssl_step(SSL *_ssl_conn,op_sock _fd,op_ssl_step_func _step){ + struct pollfd fd; + fd.fd=_fd; + for(;;){ + int ret; + int err; + ret=(*_step)(_ssl_conn); + if(ret>=0)return ret; + err=SSL_get_error(_ssl_conn,ret); + if(err==SSL_ERROR_WANT_READ)fd.events=POLLIN; + else if(err==SSL_ERROR_WANT_WRITE)fd.events=POLLOUT; + else return OP_FALSE; + if(poll(&fd,1,OP_POLL_TIMEOUT_MS)<=0)return OP_FALSE; + } +} + +/*Implement a BIO type that just indicates every operation should be retried. + We use this when initializing an SSL connection via a proxy to allow the + initial handshake to proceed all the way up to the first read attempt, and + then return. + This allows the TLS client hello message to be pipelined with the HTTP + CONNECT request.*/ + +static int op_bio_retry_write(BIO *_b,const char *_buf,int _num){ + (void)_buf; + (void)_num; + BIO_clear_retry_flags(_b); + BIO_set_retry_write(_b); + return -1; +} + +static int op_bio_retry_read(BIO *_b,char *_buf,int _num){ + (void)_buf; + (void)_num; + BIO_clear_retry_flags(_b); + BIO_set_retry_read(_b); + return -1; +} + +static int op_bio_retry_puts(BIO *_b,const char *_str){ + return op_bio_retry_write(_b,_str,0); +} + +static long op_bio_retry_ctrl(BIO *_b,int _cmd,long _num,void *_ptr){ + long ret; + (void)_b; + (void)_num; + (void)_ptr; + ret=0; + switch(_cmd){ + case BIO_CTRL_RESET: + case BIO_C_RESET_READ_REQUEST:{ + BIO_clear_retry_flags(_b); + /*Fall through.*/ + } + case BIO_CTRL_EOF: + case BIO_CTRL_SET: + case BIO_CTRL_SET_CLOSE: + case BIO_CTRL_FLUSH: + case BIO_CTRL_DUP:{ + ret=1; + }break; + } + return ret; +} + +static int op_bio_retry_new(BIO *_b){ + _b->init=1; + _b->num=0; + _b->ptr=NULL; + return 1; +} + +static int op_bio_retry_free(BIO *_b){ + return _b!=NULL; +} + +/*This is not const because OpenSSL doesn't allow it, even though it won't + write to it.*/ +static BIO_METHOD op_bio_retry_method={ + BIO_TYPE_NULL, + "retry", + op_bio_retry_write, + op_bio_retry_read, + op_bio_retry_puts, + NULL, + op_bio_retry_ctrl, + op_bio_retry_new, + op_bio_retry_free, + NULL +}; + +/*Establish a CONNECT tunnel and pipeline the start of the TLS handshake for + proxying https URL requests.*/ +static int op_http_conn_establish_tunnel(OpusHTTPStream *_stream, + OpusHTTPConn *_conn,op_sock _fd,SSL *_ssl_conn,BIO *_ssl_bio){ + BIO *retry_bio; + char *status_code; + char *next; + int ret; + _conn->ssl_conn=NULL; + _conn->fd=_fd; + OP_ASSERT(_stream->proxy_connect.nbuf>0); + ret=op_http_conn_write_fully(_conn, + _stream->proxy_connect.buf,_stream->proxy_connect.nbuf); + if(OP_UNLIKELY(ret<0))return ret; + retry_bio=BIO_new(&op_bio_retry_method); + if(OP_UNLIKELY(retry_bio==NULL))return OP_EFAULT; + SSL_set_bio(_ssl_conn,retry_bio,_ssl_bio); + SSL_set_connect_state(_ssl_conn); + /*This shouldn't succeed, since we can't read yet.*/ + OP_ALWAYS_TRUE(SSL_connect(_ssl_conn)<0); + SSL_set_bio(_ssl_conn,_ssl_bio,_ssl_bio); + /*Only now do we disable write coalescing, to allow the CONNECT + request and the start of the TLS handshake to be combined.*/ + op_sock_set_tcp_nodelay(_fd,1); + ret=op_http_conn_read_response(_conn,&_stream->response); + if(OP_UNLIKELY(ret<0))return ret; + next=op_http_parse_status_line(NULL,&status_code,_stream->response.buf); + /*According to RFC 2817, "Any successful (2xx) response to a + CONNECT request indicates that the proxy has established a + connection to the requested host and port.*/ + if(OP_UNLIKELY(next==NULL)||OP_UNLIKELY(status_code[0]!='2'))return OP_FALSE; + return 0; +} + +/*Match a host name against a host with a possible wildcard pattern according + to the rules of RFC 6125 Section 6.4.3. + Return: 0 if the pattern doesn't match, and a non-zero value if it does.*/ +static int op_http_hostname_match(const char *_host,size_t _host_len, + ASN1_STRING *_pattern){ + const char *pattern; + size_t host_label_len; + size_t host_suffix_len; + size_t pattern_len; + size_t pattern_label_len; + size_t pattern_prefix_len; + size_t pattern_suffix_len; + pattern=(const char *)ASN1_STRING_data(_pattern); + pattern_len=strlen(pattern); + /*Check the pattern for embedded NULs.*/ + if(OP_UNLIKELY(pattern_len!=(size_t)ASN1_STRING_length(_pattern)))return 0; + pattern_label_len=strcspn(pattern,"."); + OP_ASSERT(pattern_label_len<=pattern_len); + pattern_prefix_len=strcspn(pattern,"*"); + if(pattern_prefix_len>=pattern_label_len){ + /*"The client SHOULD NOT attempt to match a presented identifier in which + the wildcard character comprises a label other than the left-most label + (e.g., do not match bar.*.example.net)." [RFC 6125 Section 6.4.3]*/ + if(pattern_prefix_len<pattern_len)return 0; + /*If the pattern does not contain a wildcard in the first element, do an + exact match. + Don't use the system strcasecmp here, as that uses the locale and + RFC 4343 makes clear that DNS's case-insensitivity only applies to + the ASCII range.*/ + return _host_len==pattern_len&&op_strncasecmp(_host,pattern,_host_len)==0; + } + /*"However, the client SHOULD NOT attempt to match a presented identifier + where the wildcard character is embedded within an A-label or U-label of + an internationalized domain name." [RFC 6125 Section 6.4.3]*/ + if(op_strncasecmp(pattern,"xn--",4)==0)return 0; + host_label_len=strcspn(_host,"."); + /*Make sure the host has at least two dots, to prevent the wildcard match + from being ridiculously wide. + We should have already checked to ensure it had at least one.*/ + if(OP_UNLIKELY(_host[host_label_len]!='.') + ||strchr(_host+host_label_len+1,'.')==NULL){ + return 0; + } + OP_ASSERT(host_label_len<_host_len); + /*"If the wildcard character is the only character of the left-most label in + the presented identifier, the client SHOULD NOT compare against anything + but the left-most label of the reference identifier (e.g., *.example.com + would match foo.example.com but not bar.foo.example.com)." [RFC 6125 + Section 6.4.3] + This is really confusingly worded, as we check this by actually comparing + the rest of the pattern for an exact match. + We also use the fact that the wildcard must match at least one character, + so the left-most label of the hostname must be at least as large as the + left-most label of the pattern.*/ + if(host_label_len<pattern_label_len)return 0; + OP_ASSERT(pattern[pattern_prefix_len]=='*'); + /*"The client MAY match a presented identifier in which the wildcard + character is not the only character of the label (e.g., baz*.example.net + and *baz.example.net and b*z.example.net would be taken to match + baz1.example.net and foobaz.example.net and buzz.example.net, + respectively)." [RFC 6125 Section 6.4.3]*/ + pattern_suffix_len=pattern_len-pattern_prefix_len-1; + host_suffix_len=_host_len-host_label_len + +pattern_label_len-pattern_prefix_len-1; + return pattern_suffix_len==host_suffix_len + &&op_strncasecmp(_host,pattern,pattern_prefix_len)==0 + &&op_strncasecmp(_host+_host_len-host_suffix_len, + pattern+pattern_prefix_len+1,host_suffix_len)==0; +} + +/*Convert a host to a numeric address, if possible. + Return: A struct addrinfo containing the address, if it was numeric, and NULL + otherise.*/ +static struct addrinfo *op_inet_pton(const char *_host){ + struct addrinfo *addrs; + struct addrinfo hints; + memset(&hints,0,sizeof(hints)); + hints.ai_socktype=SOCK_STREAM; + hints.ai_flags=AI_NUMERICHOST; + if(!getaddrinfo(_host,NULL,&hints,&addrs))return addrs; + return NULL; +} + +/*Verify the server's hostname matches the certificate they presented using + the procedure from Section 6 of RFC 6125. + Return: 0 if the certificate doesn't match, and a non-zero value if it does.*/ +static int op_http_verify_hostname(OpusHTTPStream *_stream,SSL *_ssl_conn){ + X509 *peer_cert; + STACK_OF(GENERAL_NAME) *san_names; + char *host; + size_t host_len; + int ret; + host=_stream->url.host; + host_len=strlen(host); + peer_cert=SSL_get_peer_certificate(_ssl_conn); + /*We set VERIFY_PEER, so we shouldn't get here without a certificate.*/ + if(OP_UNLIKELY(peer_cert==NULL))return 0; + ret=0; + OP_ASSERT(host_len<INT_MAX); + /*RFC 2818 says (after correcting for Eratta 1077): "If a subjectAltName + extension of type dNSName is present, that MUST be used as the identity. + Otherwise, the (most specific) Common Name field in the Subject field of + the certificate MUST be used. + Although the use of the Common Name is existing practice, it is deprecated + and Certification Authorities are encouraged to use the dNSName + instead." + "Matching is performed using the matching rules specified by RFC 2459. + If more than one identity of a given type is present in the certificate + (e.g., more than one dNSName name), a match in any one of the set is + considered acceptable. + Names may contain the wildcard character * which is condered to match any + single domain name component or component fragment. + E.g., *.a.com matches foo.a.com but not bar.foo.a.com. + f*.com matches foo.com but not bar.com." + "In some cases, the URI is specified as an IP address rather than a + hostname. + In this case, the iPAddress subjectAltName must be present in the + certificate and must exactly match the IP in the URI."*/ + san_names=X509_get_ext_d2i(peer_cert,NID_subject_alt_name,NULL,NULL); + if(san_names!=NULL){ + struct addrinfo *addr; + unsigned char *ip; + int ip_len; + int nsan_names; + int sni; + /*Check to see if the host was specified as a simple IP address.*/ + addr=op_inet_pton(host); + ip=NULL; + ip_len=0; + if(addr!=NULL){ + switch(addr->ai_family){ + case AF_INET:{ + struct sockaddr_in *s; + s=(struct sockaddr_in *)addr->ai_addr; + OP_ASSERT(addr->ai_addrlen>=sizeof(*s)); + ip=(unsigned char *)&s->sin_addr; + ip_len=sizeof(s->sin_addr); + }break; + case AF_INET6:{ + struct sockaddr_in6 *s; + s=(struct sockaddr_in6 *)addr->ai_addr; + OP_ASSERT(addr->ai_addrlen>=sizeof(*s)); + ip=(unsigned char *)&s->sin6_addr; + ip_len=sizeof(s->sin6_addr); + }break; + } + } + /*We can only verify fully-qualified domain names. + To quote RFC 6125: "The extracted data MUST include only information that + can be securely parsed out of the inputs (e.g., parsing the fully + qualified DNS domain name out of the "host" component (or its + equivalent) of a URI or deriving the application service type from the + scheme of a URI) ..." + We don't have a way to check (without relying on DNS records, which might + be subverted) if this address is fully-qualified. + This is particularly problematic when using a CONNECT tunnel, as it is + the server that does DNS lookup, not us. + However, we are certain that if the hostname has no '.', it is definitely + not a fully-qualified domain name (with the exception of crazy TLDs that + actually resolve, like "uz", but I am willing to ignore those). + RFC 1535 says "...in any event where a '.' exists in a specified name it + should be assumed to be a fully qualified domain name (FQDN) and SHOULD + be tried as a rooted name first." + That doesn't give us any security guarantees, of course (a subverted DNS + could fail the original query and our resolver might still retry with a + local domain appended). + If we don't have a FQDN, just set the number of names to 0, so we'll fail + and clean up any resources we allocated.*/ + if(ip==NULL&&strchr(host,'.')==NULL)nsan_names=0; + /*RFC 2459 says there MUST be at least one, but we don't depend on it.*/ + else nsan_names=sk_GENERAL_NAME_num(san_names); + for(sni=0;sni<nsan_names;sni++){ + const GENERAL_NAME *name; + name=sk_GENERAL_NAME_value(san_names,sni); + if(ip==NULL){ + if(name->type==GEN_DNS + &&op_http_hostname_match(host,host_len,name->d.dNSName)){ + ret=1; + break; + } + } + else if(name->type==GEN_IPADD){ + unsigned char *cert_ip; + /*If we do have an IP address, compare it directly. + RFC 6125: "When the reference identity is an IP address, the identity + MUST be converted to the 'network byte order' octet string + representation. + For IP Version 4, as specified in RFC 791, the octet string will + contain exactly four octets. + For IP Version 6, as specified in RFC 2460, the octet string will + contain exactly sixteen octets. + This octet string is then compared against subjectAltName values of + type iPAddress. + A match occurs if the reference identity octet string and the value + octet strings are identical."*/ + cert_ip=ASN1_STRING_data(name->d.iPAddress); + if(ip_len==ASN1_STRING_length(name->d.iPAddress) + &&memcmp(ip,cert_ip,ip_len)==0){ + ret=1; + break; + } + } + } + sk_GENERAL_NAME_pop_free(san_names,GENERAL_NAME_free); + if(addr!=NULL)freeaddrinfo(addr); + } + /*Do the same FQDN check we did above. + We don't do this once in advance for both cases, because in the + subjectAltName case we might have an IPv6 address without a dot.*/ + else if(strchr(host,'.')!=NULL){ + int last_cn_loc; + int cn_loc; + /*If there is no subjectAltName, match against commonName. + RFC 6125 says that at least one significant CA is known to issue certs + with multiple CNs, although it SHOULD NOT. + It also says: "The server's identity may also be verified by comparing + the reference identity to the Common Name (CN) value in the last + Relative Distinguished Name (RDN) of the subject field of the server's + certificate (where "last" refers to the DER-encoded order...)." + So find the last one and check it.*/ + cn_loc=-1; + do{ + last_cn_loc=cn_loc; + cn_loc=X509_NAME_get_index_by_NID(X509_get_subject_name(peer_cert), + NID_commonName,last_cn_loc); + } + while(cn_loc>=0); + ret=last_cn_loc>=0 + &&op_http_hostname_match(host,host_len, + X509_NAME_ENTRY_get_data( + X509_NAME_get_entry(X509_get_subject_name(peer_cert),last_cn_loc))); + } + X509_free(peer_cert); + return ret; +} + +/*Perform the TLS handshake on a new connection.*/ +static int op_http_conn_start_tls(OpusHTTPStream *_stream,OpusHTTPConn *_conn, + op_sock _fd,SSL *_ssl_conn){ + SSL_SESSION *ssl_session; + BIO *ssl_bio; + int skip_certificate_check; + int ret; + ssl_bio=BIO_new_socket(_fd,BIO_NOCLOSE); + if(OP_LIKELY(ssl_bio==NULL))return OP_FALSE; +# if !defined(OPENSSL_NO_TLSEXT) + /*Support for RFC 6066 Server Name Indication.*/ + SSL_set_tlsext_host_name(_ssl_conn,_stream->url.host); +# endif + /*Resume a previous session if available.*/ + if(_stream->ssl_session!=NULL){ + SSL_set_session(_ssl_conn,_stream->ssl_session); + } + /*If we're proxying, establish the CONNECT tunnel.*/ + if(_stream->proxy_connect.nbuf>0){ + ret=op_http_conn_establish_tunnel(_stream,_conn, + _fd,_ssl_conn,ssl_bio); + if(OP_UNLIKELY(ret<0))return ret; + } + else{ + /*Otherwise, just use this socket directly.*/ + op_sock_set_tcp_nodelay(_fd,1); + SSL_set_bio(_ssl_conn,ssl_bio,ssl_bio); + SSL_set_connect_state(_ssl_conn); + } + ret=op_do_ssl_step(_ssl_conn,_fd,SSL_connect); + if(OP_UNLIKELY(ret<=0))return OP_FALSE; + ssl_session=_stream->ssl_session; + skip_certificate_check=_stream->skip_certificate_check; + if(ssl_session==NULL||!skip_certificate_check){ + ret=op_do_ssl_step(_ssl_conn,_fd,SSL_do_handshake); + if(OP_UNLIKELY(ret<=0))return OP_FALSE; + /*OpenSSL does not do hostname verification, despite the fact that we just + passed it the hostname above in the call to SSL_set_tlsext_host_name(), + because they are morons. + Do it for them.*/ + if(!skip_certificate_check&&!op_http_verify_hostname(_stream,_ssl_conn)){ + return OP_FALSE; + } + if(ssl_session==NULL){ + /*Save the session for later resumption.*/ + _stream->ssl_session=SSL_get1_session(_ssl_conn); + } + } + _conn->ssl_conn=_ssl_conn; + _conn->fd=_fd; + _conn->nrequests_left=OP_PIPELINE_MAX_REQUESTS; + return 0; +} + +/*Try to start a connection to the next address in the given list of a given + type. + _fd: The socket to connect with. + [inout] _addr: A pointer to the list of addresses. + This will be advanced to the first one that matches the given + address family (possibly the current one). + _ai_family: The address family to connect to. + Return: 1 If the connection was successful. + 0 If the connection is in progress. + OP_FALSE If the connection failed and there were no more addresses + left to try. + *_addr will be set to NULL in this case.*/ +static int op_sock_connect_next(op_sock _fd, + const struct addrinfo **_addr,int _ai_family){ + const struct addrinfo *addr; + int err; + addr=*_addr; + for(;;){ + /*Move to the next address of the requested type.*/ + for(;addr!=NULL&&addr->ai_family!=_ai_family;addr=addr->ai_next); + *_addr=addr; + /*No more: failure.*/ + if(addr==NULL)return OP_FALSE; + if(connect(_fd,addr->ai_addr,addr->ai_addrlen)>=0)return 1; + err=op_errno(); + /*Winsock will set WSAEWOULDBLOCK.*/ + if(OP_LIKELY(err==EINPROGRESS||err==EWOULDBLOCK))return 0; + addr=addr->ai_next; + } +} + +/*The number of address families to try connecting to simultaneously.*/ +# define OP_NPROTOS (2) + +static int op_http_connect_impl(OpusHTTPStream *_stream,OpusHTTPConn *_conn, + const struct addrinfo *_addrs,struct timeb *_start_time){ + const struct addrinfo *addr; + const struct addrinfo *addrs[OP_NPROTOS]; + struct pollfd fds[OP_NPROTOS]; + int ai_family; + int nprotos; + int ret; + int pi; + int pj; + for(pi=0;pi<OP_NPROTOS;pi++)addrs[pi]=NULL; + /*Try connecting via both IPv4 and IPv6 simultaneously, and keep the first + one that succeeds. + Start by finding the first address from each family. + We order the first connection attempts in the same order the address + families were returned in the DNS records in accordance with RFC 6555.*/ + for(addr=_addrs,nprotos=0;addr!=NULL&&nprotos<OP_NPROTOS;addr=addr->ai_next){ + if(addr->ai_family==AF_INET6||addr->ai_family==AF_INET){ + OP_ASSERT(addr->ai_addrlen<=sizeof(struct sockaddr_in6)); + OP_ASSERT(addr->ai_addrlen<=sizeof(struct sockaddr_in)); + /*If we've seen this address family before, skip this address for now.*/ + for(pi=0;pi<nprotos;pi++)if(addrs[pi]->ai_family==addr->ai_family)break; + if(pi<nprotos)continue; + addrs[nprotos++]=addr; + } + } + /*Pop the connection off the free list and put it on the LRU list.*/ + OP_ASSERT(_stream->free_head==_conn); + _stream->free_head=_conn->next; + _conn->next=_stream->lru_head; + _stream->lru_head=_conn; + ftime(_start_time); + *&_conn->read_time=*_start_time; + _conn->read_bytes=0; + _conn->read_rate=0; + /*Try to start a connection to each protocol. + RFC 6555 says it is RECOMMENDED that connection attempts be paced + 150...250 ms apart "to balance human factors against network load", but + that "stateful algorithms" (that's us) "are expected to be more + aggressive". + We are definitely more aggressive: we don't pace at all.*/ + for(pi=0;pi<nprotos;pi++){ + ai_family=addrs[pi]->ai_family; + fds[pi].fd=socket(ai_family,SOCK_STREAM,addrs[pi]->ai_protocol); + fds[pi].events=POLLOUT; + if(OP_LIKELY(fds[pi].fd!=OP_INVALID_SOCKET)){ + if(OP_LIKELY(op_sock_set_nonblocking(fds[pi].fd,1)>=0)){ + ret=op_sock_connect_next(fds[pi].fd,addrs+pi,ai_family); + if(OP_UNLIKELY(ret>0)){ + /*It succeeded right away (technically possible), so stop.*/ + nprotos=pi+1; + break; + } + /*Otherwise go on to the next protocol, and skip the clean-up below.*/ + else if(ret==0)continue; + /*Tried all the addresses for this protocol.*/ + } + /*Clean up the socket.*/ + close(fds[pi].fd); + } + /*Remove this protocol from the list.*/ + memmove(addrs+pi,addrs+pi+1,sizeof(*addrs)*(nprotos-pi-1)); + nprotos--; + pi--; + } + /*Wait for one of the connections to finish.*/ + while(pi>=nprotos&&nprotos>0&&poll(fds,nprotos,OP_POLL_TIMEOUT_MS)>0){ + for(pi=0;pi<nprotos;pi++){ + socklen_t errlen; + int err; + /*Still waiting...*/ + if(!fds[pi].revents)continue; + errlen=sizeof(err); + /*Some platforms will return the pending error in &err and return 0. + Others will put it in errno and return -1.*/ + ret=getsockopt(fds[pi].fd,SOL_SOCKET,SO_ERROR,&err,&errlen); + if(ret<0)err=op_errno(); + /*Success!*/ + if(err==0||err==EISCONN)break; + /*Move on to the next address for this protocol.*/ + ai_family=addrs[pi]->ai_family; + addrs[pi]=addrs[pi]->ai_next; + ret=op_sock_connect_next(fds[pi].fd,addrs+pi,ai_family); + /*It succeeded right away, so stop.*/ + if(ret>0)break; + /*Otherwise go on to the next protocol, and skip the clean-up below.*/ + else if(ret==0)continue; + /*Tried all the addresses for this protocol. + Remove it from the list.*/ + close(fds[pi].fd); + memmove(fds+pi,fds+pi+1,sizeof(*fds)*(nprotos-pi-1)); + memmove(addrs+pi,addrs+pi+1,sizeof(*addrs)*(nprotos-pi-1)); + nprotos--; + pi--; + } + } + /*Close all the other sockets.*/ + for(pj=0;pj<nprotos;pj++)if(pi!=pj)close(fds[pj].fd); + /*If none of them succeeded, we're done.*/ + if(pi>=nprotos)return OP_FALSE; + /*Save this address for future connection attempts.*/ + if(addrs[pi]!=&_stream->addr_info){ + memcpy(&_stream->addr_info,addrs[pi],sizeof(_stream->addr_info)); + _stream->addr_info.ai_addr=&_stream->addr.s; + _stream->addr_info.ai_next=NULL; + memcpy(&_stream->addr,addrs[pi]->ai_addr,addrs[pi]->ai_addrlen); + } + if(OP_URL_IS_SSL(&_stream->url)){ + SSL *ssl_conn; + /*Start the SSL connection.*/ + OP_ASSERT(_stream->ssl_ctx!=NULL); + ssl_conn=SSL_new(_stream->ssl_ctx); + if(OP_LIKELY(ssl_conn!=NULL)){ + ret=op_http_conn_start_tls(_stream,_conn,fds[pi].fd,ssl_conn); + if(OP_LIKELY(ret>=0))return ret; + SSL_free(ssl_conn); + } + close(fds[pi].fd); + _conn->fd=OP_INVALID_SOCKET; + return OP_FALSE; + } + /*Just a normal non-SSL connection.*/ + _conn->ssl_conn=NULL; + _conn->fd=fds[pi].fd; + _conn->nrequests_left=OP_PIPELINE_MAX_REQUESTS; + /*Disable write coalescing. + We always send whole requests at once and always parse the response headers + before sending another one.*/ + op_sock_set_tcp_nodelay(fds[pi].fd,1); + return 0; +} + +static int op_http_connect(OpusHTTPStream *_stream,OpusHTTPConn *_conn, + const struct addrinfo *_addrs,struct timeb *_start_time){ + struct timeb resolve_time; + struct addrinfo *new_addrs; + int ret; + /*Re-resolve the host if we need to (RFC 6555 says we MUST do so + occasionally).*/ + new_addrs=NULL; + ftime(&resolve_time); + if(_addrs!=&_stream->addr_info||op_time_diff_ms(&resolve_time, + &_stream->resolve_time)>=OP_RESOLVE_CACHE_TIMEOUT_MS){ + new_addrs=op_resolve(_stream->connect_host,_stream->connect_port); + if(OP_LIKELY(new_addrs!=NULL)){ + _addrs=new_addrs; + *&_stream->resolve_time=*&resolve_time; + } + else if(OP_LIKELY(_addrs==NULL))return OP_FALSE; + } + ret=op_http_connect_impl(_stream,_conn,_addrs,_start_time); + if(new_addrs!=NULL)freeaddrinfo(new_addrs); + return ret; +} + +# define OP_BASE64_LENGTH(_len) (((_len)+2)/3*4) + +static const char BASE64_TABLE[64]={ + 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P', + 'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f', + 'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v', + 'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' +}; + +static char *op_base64_encode(char *_dst,const char *_src,int _len){ + unsigned s0; + unsigned s1; + unsigned s2; + int ngroups; + int i; + ngroups=_len/3; + for(i=0;i<ngroups;i++){ + s0=_src[3*i+0]; + s1=_src[3*i+1]; + s2=_src[3*i+2]; + _dst[4*i+0]=BASE64_TABLE[s0>>2]; + _dst[4*i+1]=BASE64_TABLE[(s0&3)<<4|s1>>4]; + _dst[4*i+2]=BASE64_TABLE[(s1&15)<<2|s2>>6]; + _dst[4*i+3]=BASE64_TABLE[s2&63]; + } + _len-=3*i; + if(_len==1){ + s0=_src[3*i+0]; + _dst[4*i+0]=BASE64_TABLE[s0>>2]; + _dst[4*i+1]=BASE64_TABLE[(s0&3)<<4]; + _dst[4*i+2]='='; + _dst[4*i+3]='='; + i++; + } + else if(_len==2){ + s0=_src[3*i+0]; + s1=_src[3*i+1]; + _dst[4*i+0]=BASE64_TABLE[s0>>2]; + _dst[4*i+1]=BASE64_TABLE[(s0&3)<<4|s1>>4]; + _dst[4*i+2]=BASE64_TABLE[(s1&15)<<2]; + _dst[4*i+3]='='; + i++; + } + _dst[4*i]='\0'; + return _dst+4*i; +} + +/*Construct an HTTP authorization header using RFC 2617's Basic Authentication + Scheme and append it to the given string buffer.*/ +static int op_sb_append_basic_auth_header(OpusStringBuf *_sb, + const char *_header,const char *_user,const char *_pass){ + int user_len; + int pass_len; + int user_pass_len; + int base64_len; + int nbuf_total; + int ret; + ret=op_sb_append_string(_sb,_header); + ret|=op_sb_append(_sb,": Basic ",8); + user_len=strlen(_user); + pass_len=strlen(_pass); + if(OP_UNLIKELY(pass_len>INT_MAX-user_len))return OP_EFAULT; + if(OP_UNLIKELY(user_len+pass_len>(INT_MAX>>2)*3-3))return OP_EFAULT; + user_pass_len=user_len+1+pass_len; + base64_len=OP_BASE64_LENGTH(user_pass_len); + /*Stick "user:pass" at the end of the buffer so we can Base64 encode it + in-place.*/ + nbuf_total=_sb->nbuf; + if(OP_UNLIKELY(base64_len>INT_MAX-nbuf_total))return OP_EFAULT; + nbuf_total+=base64_len; + ret|=op_sb_ensure_capacity(_sb,nbuf_total); + if(OP_UNLIKELY(ret<0))return ret; + _sb->nbuf=nbuf_total-user_pass_len; + OP_ALWAYS_TRUE(!op_sb_append(_sb,_user,user_len)); + OP_ALWAYS_TRUE(!op_sb_append(_sb,":",1)); + OP_ALWAYS_TRUE(!op_sb_append(_sb,_pass,pass_len)); + op_base64_encode(_sb->buf+nbuf_total-base64_len, + _sb->buf+nbuf_total-user_pass_len,user_pass_len); + return op_sb_append(_sb,"\r\n",2); +} + +static int op_http_allow_pipelining(const char *_server){ + /*Servers known to do bad things with pipelined requests. + This list is taken from Gecko's nsHttpConnection::SupportsPipelining() (in + netwerk/protocol/http/nsHttpConnection.cpp).*/ + static const char *BAD_SERVERS[]={ + "EFAServer/", + "Microsoft-IIS/4.", + "Microsoft-IIS/5.", + "Netscape-Enterprise/3.", + "Netscape-Enterprise/4.", + "Netscape-Enterprise/5.", + "Netscape-Enterprise/6.", + "WebLogic 3.", + "WebLogic 4.", + "WebLogic 5.", + "WebLogic 6.", + "Winstone Servlet Engine v0." + }; +# define NBAD_SERVERS ((int)(sizeof(BAD_SERVERS)/sizeof(*BAD_SERVERS))) + if(*_server>='E'&&*_server<='W'){ + int si; + for(si=0;si<NBAD_SERVERS;si++){ + if(strncmp(_server,BAD_SERVERS[si],strlen(BAD_SERVERS[si]))==0){ + return 0; + } + } + } + return 1; +# undef NBAD_SERVERS +} + +static int op_http_stream_open(OpusHTTPStream *_stream,const char *_url, + int _skip_certificate_check,const char *_proxy_host,unsigned _proxy_port, + const char *_proxy_user,const char *_proxy_pass,OpusServerInfo *_info){ + struct addrinfo *addrs; + int nredirs; + int ret; +#if defined(_WIN32) + op_init_winsock(); +#endif + ret=op_parse_url(&_stream->url,_url); + if(OP_UNLIKELY(ret<0))return ret; + if(_proxy_host!=NULL){ + if(OP_UNLIKELY(_proxy_port>65535U))return OP_EINVAL; + _stream->connect_host=op_string_dup(_proxy_host); + _stream->connect_port=_proxy_port; + } + else{ + _stream->connect_host=_stream->url.host; + _stream->connect_port=_stream->url.port; + } + addrs=NULL; + for(nredirs=0;nredirs<OP_REDIRECT_LIMIT;nredirs++){ + OpusParsedURL next_url; + struct timeb start_time; + struct timeb end_time; + char *next; + char *status_code; + int minor_version_pos; + int v1_1_compat; + /*Initialize the SSL library if necessary.*/ + if(OP_URL_IS_SSL(&_stream->url)&&_stream->ssl_ctx==NULL){ + SSL_CTX *ssl_ctx; +# if !defined(OPENSSL_NO_LOCKING) + /*The documentation says SSL_library_init() is not reentrant. + We don't want to add our own depenencies on a threading library, and it + appears that it's safe to call OpenSSL's locking functions before the + library is initialized, so that's what we'll do (really OpenSSL should + do this for us). + This doesn't guarantee that _other_ threads in the application aren't + calling SSL_library_init() at the same time, but there's not much we + can do about that.*/ + CRYPTO_w_lock(CRYPTO_LOCK_SSL); +# endif + SSL_library_init(); + /*Needed to get SHA2 algorithms with old OpenSSL versions.*/ + OpenSSL_add_ssl_algorithms(); +# if !defined(OPENSSL_NO_LOCKING) + CRYPTO_w_unlock(CRYPTO_LOCK_SSL); +# endif + ssl_ctx=SSL_CTX_new(SSLv23_client_method()); + if(ssl_ctx==NULL)return OP_EFAULT; + if(!_skip_certificate_check){ + /*We don't do anything if this fails, since it just means we won't load + any certificates (and thus all checks will fail). + However, as that is probably the result of a system + mis-configuration, assert here to make it easier to identify.*/ + OP_ALWAYS_TRUE(SSL_CTX_set_default_verify_paths(ssl_ctx)); + SSL_CTX_set_verify(ssl_ctx,SSL_VERIFY_PEER,NULL); + } + _stream->ssl_ctx=ssl_ctx; + _stream->skip_certificate_check=_skip_certificate_check; + if(_proxy_host!=NULL){ + /*We need to establish a CONNECT tunnel to handle https proxying. + Build the request we'll send to do so.*/ + _stream->proxy_connect.nbuf=0; + ret=op_sb_append(&_stream->proxy_connect,"CONNECT ",8); + ret|=op_sb_append_string(&_stream->proxy_connect,_stream->url.host); + ret|=op_sb_append_port(&_stream->proxy_connect,_stream->url.port); + /*CONNECT requires at least HTTP 1.1.*/ + ret|=op_sb_append(&_stream->proxy_connect," HTTP/1.1\r\n",11); + ret|=op_sb_append(&_stream->proxy_connect,"Host: ",6); + ret|=op_sb_append_string(&_stream->proxy_connect,_stream->url.host); + /*The example in RFC 2817 Section 5.2 specifies an explicit port even + when connecting to the default port. + Given that the proxy doesn't know whether we're trying to connect to + an http or an https URL except by the port number, this seems like a + good idea.*/ + ret|=op_sb_append_port(&_stream->proxy_connect,_stream->url.port); + ret|=op_sb_append(&_stream->proxy_connect,"\r\n",2); + ret|=op_sb_append(&_stream->proxy_connect,"User-Agent: .\r\n",15); + if(_proxy_user!=NULL&&_proxy_pass!=NULL){ + ret|=op_sb_append_basic_auth_header(&_stream->proxy_connect, + "Proxy-Authorization",_proxy_user,_proxy_pass); + } + /*For backwards compatibility.*/ + ret|=op_sb_append(&_stream->proxy_connect, + "Proxy-Connection: keep-alive\r\n",30); + ret|=op_sb_append(&_stream->proxy_connect,"\r\n",2); + if(OP_UNLIKELY(ret<0))return ret; + } + } + /*Actually make the connection.*/ + ret=op_http_connect(_stream,_stream->conns+0,addrs,&start_time); + if(OP_UNLIKELY(ret<0))return ret; + /*Build the request to send.*/ + _stream->request.nbuf=0; + ret=op_sb_append(&_stream->request,"GET ",4); + ret|=op_sb_append_string(&_stream->request, + _proxy_host!=NULL?_url:_stream->url.path); + /*Send HTTP/1.0 by default for maximum compatibility (so we don't have to + re-try if HTTP/1.1 fails, though it shouldn't, even for a 1.0 server). + This means we aren't conditionally compliant with RFC 2145, because we + violate the requirement that "An HTTP client SHOULD send a request + version equal to the highest version for which the client is at least + conditionally compliant...". + According to RFC 2145, that means we can't claim any compliance with any + IETF HTTP specification.*/ + ret|=op_sb_append(&_stream->request," HTTP/1.0\r\n",11); + /*Remember where this is so we can upgrade to HTTP/1.1 if the server + supports it.*/ + minor_version_pos=_stream->request.nbuf-3; + ret|=op_sb_append(&_stream->request,"Host: ",6); + ret|=op_sb_append_string(&_stream->request,_stream->url.host); + if(!OP_URL_IS_DEFAULT_PORT(&_stream->url)){ + ret|=op_sb_append_port(&_stream->request,_stream->url.port); + } + ret|=op_sb_append(&_stream->request,"\r\n",2); + /*User-Agents have been a bad idea, so send as little as possible. + RFC 2616 requires at least one token in the User-Agent, which must have + at least one character.*/ + ret|=op_sb_append(&_stream->request,"User-Agent: .\r\n",15); + if(_proxy_host!=NULL&&!OP_URL_IS_SSL(&_stream->url) + &&_proxy_user!=NULL&&_proxy_pass!=NULL){ + ret|=op_sb_append_basic_auth_header(&_stream->request, + "Proxy-Authorization",_proxy_user,_proxy_pass); + } + if(_stream->url.user!=NULL&&_stream->url.pass!=NULL){ + ret|=op_sb_append_basic_auth_header(&_stream->request, + "Authorization",_stream->url.user,_stream->url.pass); + } + /*Always send a Referer [sic] header. + It's common to refuse to serve a resource unless one is present. + We just use the relative "/" URI to suggest we came from the same domain, + as this is the most common check. + This might violate RFC 2616's mandate that the field "MUST NOT be sent if + the Request-URI was obtained from a source that does not have its own + URI, such as input from the user keyboard," but we don't really have any + way to know.*/ + /*TODO: Should we update this on redirects?*/ + ret|=op_sb_append(&_stream->request,"Referer: /\r\n",12); + /*Always send a Range request header to find out if we're seekable. + This requires an HTTP/1.1 server to succeed, but we'll still get what we + want with an HTTP/1.0 server that ignores this request header.*/ + ret|=op_sb_append(&_stream->request,"Range: bytes=0-\r\n",17); + /*Remember where this is so we can append offsets to it later.*/ + _stream->request_tail=_stream->request.nbuf-4; + ret|=op_sb_append(&_stream->request,"\r\n",2); + if(OP_UNLIKELY(ret<0))return ret; + ret=op_http_conn_write_fully(_stream->conns+0, + _stream->request.buf,_stream->request.nbuf); + if(OP_UNLIKELY(ret<0))return ret; + ret=op_http_conn_read_response(_stream->conns+0,&_stream->response); + if(OP_UNLIKELY(ret<0))return ret; + ftime(&end_time); + next=op_http_parse_status_line(&v1_1_compat,&status_code, + _stream->response.buf); + if(OP_UNLIKELY(next==NULL))return OP_FALSE; + if(status_code[0]=='2'){ + opus_int64 content_length; + opus_int64 range_length; + int pipeline_supported; + int pipeline_disabled; + /*We only understand 20x codes.*/ + if(status_code[1]!='0')return OP_FALSE; + content_length=-1; + range_length=-1; + /*Pipelining must be explicitly enabled.*/ + pipeline_supported=0; + pipeline_disabled=0; + for(;;){ + char *header; + char *cdr; + ret=op_http_get_next_header(&header,&cdr,&next); + if(OP_UNLIKELY(ret<0))return ret; + if(header==NULL)break; + if(strcmp(header,"content-length")==0){ + /*Two Content-Length headers?*/ + if(OP_UNLIKELY(content_length>=0))return OP_FALSE; + content_length=op_http_parse_content_length(cdr); + if(OP_UNLIKELY(content_length<0))return (int)content_length; + /*Make sure the Content-Length and Content-Range headers match.*/ + if(range_length>=0&&OP_UNLIKELY(content_length!=range_length)){ + return OP_FALSE; + } + } + else if(strcmp(header,"content-range")==0){ + opus_int64 range_first; + opus_int64 range_last; + /*Two Content-Range headers?*/ + if(OP_UNLIKELY(range_length>=0))return OP_FALSE; + ret=op_http_parse_content_range(&range_first,&range_last, + &range_length,cdr); + if(OP_UNLIKELY(ret<0))return ret; + /*"A response with satus code 206 (Partial Content) MUST NOT + include a Content-Range field with a byte-range-resp-spec of + '*'."*/ + if(status_code[2]=='6' + &&(OP_UNLIKELY(range_first<0)||OP_UNLIKELY(range_last<0))){ + return OP_FALSE; + } + /*We asked for the entire resource.*/ + if(range_length>=0){ + /*Quit if we didn't get it.*/ + if(range_last>=0&&OP_UNLIKELY(range_last!=range_length-1)){ + return OP_FALSE; + } + } + /*If there was no length, use the end of the range.*/ + else if(range_last>=0)range_length=range_last+1; + /*Make sure the Content-Length and Content-Range headers match.*/ + if(content_length>=0&&OP_UNLIKELY(content_length!=range_length)){ + return OP_FALSE; + } + } + else if(strcmp(header,"connection")==0){ + /*According to RFC 2616, if an HTTP/1.1 application does not support + pipelining, it "MUST include the 'close' connection option in + every message." + Therefore, if we receive one in the initial response, disable + pipelining entirely. + The server still might support it (e.g., we might just have hit the + request limit for a temporary child process), but if it doesn't + and we assume it does, every time we cross a chunk boundary we'll + error out and reconnect, adding lots of latency.*/ + ret=op_http_parse_connection(cdr); + if(OP_UNLIKELY(ret<0))return ret; + pipeline_disabled|=ret; + } + else if(strcmp(header,"server")==0){ + /*If we got a Server response header, and it wasn't from a known-bad + server, enable pipelining, as long as it's at least HTTP/1.1. + According to RFC 2145, the server is supposed to respond with the + highest minor version number it supports unless it is known or + suspected that we incorrectly implement the HTTP specification. + So it should send back at least HTTP/1.1, despite our HTTP/1.0 + request.*/ + pipeline_supported=v1_1_compat; + if(v1_1_compat)pipeline_disabled|=!op_http_allow_pipelining(cdr); + if(_info!=NULL&&_info->server==NULL)_info->server=op_string_dup(cdr); + } + /*Collect station information headers if the caller requested it. + If there's more than one copy of a header, the first one wins.*/ + else if(_info!=NULL){ + if(strcmp(header,"content-type")==0){ + if(_info->content_type==NULL){ + _info->content_type=op_string_dup(cdr); + } + } + else if(header[0]=='i'&&header[1]=='c' + &&(header[2]=='e'||header[2]=='y')&&header[3]=='-'){ + if(strcmp(header+4,"name")==0){ + if(_info->name==NULL)_info->name=op_string_dup(cdr); + } + else if(strcmp(header+4,"description")==0){ + if(_info->description==NULL)_info->description=op_string_dup(cdr); + } + else if(strcmp(header+4,"genre")==0){ + if(_info->genre==NULL)_info->genre=op_string_dup(cdr); + } + else if(strcmp(header+4,"url")==0){ + if(_info->url==NULL)_info->url=op_string_dup(cdr); + } + else if(strcmp(header,"icy-br")==0 + ||strcmp(header,"ice-bitrate")==0){ + if(_info->bitrate_kbps<0){ + opus_int64 bitrate_kbps; + /*Just re-using this function to parse a random unsigned + integer field.*/ + bitrate_kbps=op_http_parse_content_length(cdr); + if(bitrate_kbps>=0&&bitrate_kbps<=OP_INT32_MAX){ + _info->bitrate_kbps=(opus_int32)bitrate_kbps; + } + } + } + else if(strcmp(header,"icy-pub")==0 + ||strcmp(header,"ice-public")==0){ + if(_info->is_public<0&&(cdr[0]=='0'||cdr[0]=='1')&&cdr[1]=='\0'){ + _info->is_public=cdr[0]-'0'; + } + } + } + } + } + switch(status_code[2]){ + /*200 OK*/ + case '0':break; + /*203 Non-Authoritative Information*/ + case '3':break; + /*204 No Content*/ + case '4':{ + if(content_length>=0&&OP_UNLIKELY(content_length!=0)){ + return OP_FALSE; + } + }break; + /*206 Partial Content*/ + case '6':{ + /*No Content-Range header.*/ + if(OP_UNLIKELY(range_length<0))return OP_FALSE; + content_length=range_length; + /*The server supports range requests for this resource. + We can seek.*/ + _stream->seekable=1; + }break; + /*201 Created: the response "SHOULD include an entity containing a list + of resource characteristics and location(s)," but not an Opus file. + 202 Accepted: the response "SHOULD include an indication of request's + current status and either a pointer to a status monitor or some + estimate of when the user can expect the request to be fulfilled," + but not an Opus file. + 205 Reset Content: this "MUST NOT include an entity," meaning no Opus + file. + 207...209 are not yet defined, so we don't know how to handle them.*/ + default:return OP_FALSE; + } + _stream->content_length=content_length; + _stream->pipeline=pipeline_supported&&!pipeline_disabled; + /*Pipelining requires HTTP/1.1 persistent connections.*/ + if(_stream->pipeline)_stream->request.buf[minor_version_pos]='1'; + _stream->conns[0].pos=0; + _stream->conns[0].end_pos=_stream->seekable?content_length:-1; + _stream->conns[0].chunk_size=-1; + _stream->cur_conni=0; + _stream->connect_rate=op_time_diff_ms(&end_time,&start_time); + _stream->connect_rate=OP_MAX(_stream->connect_rate,1); + if(_info!=NULL)_info->is_ssl=OP_URL_IS_SSL(&_stream->url); + /*The URL has been successfully opened.*/ + return 0; + } + /*Shouldn't get 1xx; 4xx and 5xx are both failures (and we don't retry). + Everything else is undefined.*/ + else if(status_code[0]!='3')return OP_FALSE; + /*We have some form of redirect request.*/ + /*We only understand 30x codes.*/ + if(status_code[1]!='0')return OP_FALSE; + switch(status_code[2]){ + /*300 Multiple Choices: "If the server has a preferred choice of + representation, it SHOULD include the specific URI for that + representation in the Location field," otherwise we'll fail.*/ + case '0': + /*301 Moved Permanently*/ + case '1': + /*302 Found*/ + case '2': + /*307 Temporary Redirect*/ + case '7': + /*308 Permanent Redirect (defined by draft-reschke-http-status-308-07).*/ + case '8':break; + /*305 Use Proxy: "The Location field gives the URI of the proxy." + TODO: This shouldn't actually be that hard to do.*/ + case '5':return OP_EIMPL; + /*303 See Other: "The new URI is not a substitute reference for the + originally requested resource." + 304 Not Modified: "The 304 response MUST NOT contain a message-body." + 306 (Unused) + 309 is not yet defined, so we don't know how to handle it.*/ + default:return OP_FALSE; + } + _url=NULL; + for(;;){ + char *header; + char *cdr; + ret=op_http_get_next_header(&header,&cdr,&next); + if(OP_UNLIKELY(ret<0))return ret; + if(header==NULL)break; + if(strcmp(header,"location")==0&&OP_LIKELY(_url==NULL))_url=cdr; + } + if(OP_UNLIKELY(_url==NULL))return OP_FALSE; + ret=op_parse_url(&next_url,_url); + if(OP_UNLIKELY(ret<0))return ret; + if(_proxy_host==NULL||_stream->ssl_session!=NULL){ + if(strcmp(_stream->url.host,next_url.host)==0 + &&_stream->url.port==next_url.port){ + /*Try to skip re-resolve when connecting to the same host.*/ + addrs=&_stream->addr_info; + } + else{ + if(_stream->ssl_session!=NULL){ + /*Forget any cached SSL session from the last host.*/ + SSL_SESSION_free(_stream->ssl_session); + _stream->ssl_session=NULL; + } + } + } + if(_proxy_host==NULL){ + OP_ASSERT(_stream->connect_host==_stream->url.host); + _stream->connect_host=next_url.host; + _stream->connect_port=next_url.port; + } + /*Always try to skip re-resolve for proxy connections.*/ + else addrs=&_stream->addr_info; + op_parsed_url_clear(&_stream->url); + *&_stream->url=*&next_url; + /*TODO: On servers/proxies that support pipelining, we might be able to + re-use this connection.*/ + op_http_conn_close(_stream,_stream->conns+0,&_stream->lru_head,1); + } + /*Redirection limit reached.*/ + return OP_FALSE; +} + +static int op_http_conn_send_request(OpusHTTPStream *_stream, + OpusHTTPConn *_conn,opus_int64 _pos,opus_int32 _chunk_size, + int _try_not_to_block){ + opus_int64 next_end; + int ret; + /*We shouldn't have another request outstanding.*/ + OP_ASSERT(_conn->next_pos<0); + /*Build the request to send.*/ + OP_ASSERT(_stream->request.nbuf>=_stream->request_tail); + _stream->request.nbuf=_stream->request_tail; + ret=op_sb_append_nonnegative_int64(&_stream->request,_pos); + ret|=op_sb_append(&_stream->request,"-",1); + if(_chunk_size>0&&OP_ADV_OFFSET(_pos,2*_chunk_size)<_stream->content_length){ + /*We shouldn't be pipelining requests with non-HTTP/1.1 servers.*/ + OP_ASSERT(_stream->pipeline); + next_end=_pos+_chunk_size; + ret|=op_sb_append_nonnegative_int64(&_stream->request,next_end-1); + /*Use a larger chunk size for our next request.*/ + _chunk_size<<=1; + /*But after a while, just request the rest of the resource.*/ + if(_chunk_size>OP_PIPELINE_CHUNK_SIZE_MAX)_chunk_size=-1; + } + else{ + /*Either this was a non-pipelined request or we were close enough to the + end to just ask for the rest.*/ + next_end=-1; + _chunk_size=-1; + } + ret|=op_sb_append(&_stream->request,"\r\n\r\n",4); + if(OP_UNLIKELY(ret<0))return ret; + /*If we don't want to block, check to see if there's enough space in the send + queue. + There's still a chance we might block, even if there is enough space, but + it's a much slimmer one. + Blocking at all is pretty unlikely, as we won't have any requests queued + when _try_not_to_block is set, so if FIONSPACE isn't available (e.g., on + Linux), just skip the test.*/ + if(_try_not_to_block){ +# if defined(FIONSPACE) + int available; + ret=ioctl(_conn->fd,FIONSPACE,&available); + if(ret<0||available<_stream->request.nbuf)return 1; +# endif + } + ret=op_http_conn_write_fully(_conn, + _stream->request.buf,_stream->request.nbuf); + if(OP_UNLIKELY(ret<0))return ret; + _conn->next_pos=_pos; + _conn->next_end=next_end; + /*Save the chunk size to use for the next request.*/ + _conn->chunk_size=_chunk_size; + _conn->nrequests_left--; + return ret; +} + +/*Handles the response to all requests after the first one. + Return: 1 if the connection was closed or timed out, 0 on success, or a + negative value on any other error.*/ +static int op_http_conn_handle_response(OpusHTTPStream *_stream, + OpusHTTPConn *_conn){ + char *next; + char *status_code; + opus_int64 range_length; + opus_int64 next_pos; + opus_int64 next_end; + int ret; + ret=op_http_conn_read_response(_conn,&_stream->response); + /*If the server just closed the connection on us, we may have just hit a + connection re-use limit, so we might want to retry.*/ + if(OP_UNLIKELY(ret<0))return ret==OP_EREAD?1:ret; + next=op_http_parse_status_line(NULL,&status_code,_stream->response.buf); + if(OP_UNLIKELY(next==NULL))return OP_FALSE; + /*We _need_ a 206 Partial Content response. + Nothing else will do.*/ + if(strncmp(status_code,"206",3)!=0){ + /*But on a 408 Request Timeout, we might want to re-try.*/ + return strncmp(status_code,"408",3)==0?1:OP_FALSE; + } + next_pos=_conn->next_pos; + next_end=_conn->next_end; + range_length=-1; + for(;;){ + char *header; + char *cdr; + ret=op_http_get_next_header(&header,&cdr,&next); + if(OP_UNLIKELY(ret<0))return ret; + if(header==NULL)break; + if(strcmp(header,"content-range")==0){ + opus_int64 range_first; + opus_int64 range_last; + /*Two Content-Range headers?*/ + if(OP_UNLIKELY(range_length>=0))return OP_FALSE; + ret=op_http_parse_content_range(&range_first,&range_last, + &range_length,cdr); + if(OP_UNLIKELY(ret<0))return ret; + /*"A response with satus code 206 (Partial Content) MUST NOT + include a Content-Range field with a byte-range-resp-spec of + '*'."*/ + if(OP_UNLIKELY(range_first<0)||OP_UNLIKELY(range_last<0))return OP_FALSE; + /*We also don't want range_last to overflow.*/ + if(OP_UNLIKELY(range_last>=OP_INT64_MAX))return OP_FALSE; + range_last++; + /*Quit if we didn't get the offset we asked for.*/ + if(range_first!=next_pos)return OP_FALSE; + if(next_end<0){ + /*We asked for the rest of the resource.*/ + if(range_length>=0){ + /*Quit if we didn't get it.*/ + if(OP_UNLIKELY(range_last!=range_length))return OP_FALSE; + } + /*If there was no length, use the end of the range.*/ + else range_length=range_last; + next_end=range_last; + } + else{ + if(range_last!=next_end)return OP_FALSE; + /*If there was no length, use the larger of the content length or the + end of this chunk.*/ + if(range_length<0){ + range_length=OP_MAX(range_last,_stream->content_length); + } + } + } + else if(strcmp(header,"content-length")==0){ + opus_int64 content_length; + /*Validate the Content-Length header, if present, against the request we + made.*/ + content_length=op_http_parse_content_length(cdr); + if(OP_UNLIKELY(content_length<0))return (int)content_length; + if(next_end<0){ + /*If we haven't seen the Content-Range header yet and we asked for the + rest of the resource, set next_end, so we can make sure they match + when we do find the Content-Range header.*/ + if(OP_UNLIKELY(next_pos>OP_INT64_MAX-content_length))return OP_FALSE; + next_end=next_pos+content_length; + } + /*Otherwise, make sure they match now.*/ + else if(OP_UNLIKELY(next_end-next_pos!=content_length))return OP_FALSE; + } + else if(strcmp(header,"connection")==0){ + ret=op_http_parse_connection(cdr); + if(OP_UNLIKELY(ret<0))return ret; + /*If the server told us it was going to close the connection, don't make + any more requests.*/ + if(OP_UNLIKELY(ret>0))_conn->nrequests_left=0; + } + } + /*No Content-Range header.*/ + if(OP_UNLIKELY(range_length<0))return OP_FALSE; + /*Update the content_length if necessary.*/ + _stream->content_length=range_length; + _conn->pos=next_pos; + _conn->end_pos=next_end; + _conn->next_pos=-1; + return 0; +} + +/*Open a new connection that will start reading at byte offset _pos. + _pos: The byte offset to start reading from. + _chunk_size: The number of bytes to ask for in the initial request, or -1 to + request the rest of the resource. + This may be more bytes than remain, in which case it will be + converted into a request for the rest.*/ +static int op_http_conn_open_pos(OpusHTTPStream *_stream, + OpusHTTPConn *_conn,opus_int64 _pos,opus_int32 _chunk_size){ + struct timeb start_time; + struct timeb end_time; + opus_int32 connect_rate; + opus_int32 connect_time; + int ret; + ret=op_http_connect(_stream,_conn,&_stream->addr_info,&start_time); + if(OP_UNLIKELY(ret<0))return ret; + ret=op_http_conn_send_request(_stream,_conn,_pos,_chunk_size,0); + if(OP_UNLIKELY(ret<0))return ret; + ret=op_http_conn_handle_response(_stream,_conn); + if(OP_UNLIKELY(ret!=0))return OP_FALSE; + ftime(&end_time); + _stream->cur_conni=_conn-_stream->conns; + OP_ASSERT(_stream->cur_conni>=0&&_stream->cur_conni<OP_NCONNS_MAX); + /*The connection has been successfully opened. + Update the connection time estimate.*/ + connect_time=op_time_diff_ms(&end_time,&start_time); + connect_rate=_stream->connect_rate; + connect_rate+=OP_MAX(connect_time,1)-connect_rate+8>>4; + _stream->connect_rate=connect_rate; + return 0; +} + +/*Read data from the current response body. + If we're pipelining and we get close to the end of this response, queue + another request. + If we've reached the end of this response body, parse the next response and + keep going. + [out] _buf: Returns the data read. + _buf_size: The size of the buffer. + Return: A positive number of bytes read on success. + 0: The connection was closed. + OP_EREAD: There was a fatal read error.*/ +static int op_http_conn_read_body(OpusHTTPStream *_stream, + OpusHTTPConn *_conn,unsigned char *_buf,int _buf_size){ + opus_int64 pos; + opus_int64 end_pos; + opus_int64 next_pos; + opus_int64 content_length; + int nread; + int pipeline; + int ret; + /*Currently this function can only be called on the LRU head. + Otherwise, we'd need a _pnext pointer if we needed to close the connection, + and re-opening it would re-organize the lists.*/ + OP_ASSERT(_stream->lru_head==_conn); + /*We should have filterd out empty reads by this point.*/ + OP_ASSERT(_buf_size>0); + pos=_conn->pos; + end_pos=_conn->end_pos; + next_pos=_conn->next_pos; + pipeline=_stream->pipeline; + content_length=_stream->content_length; + if(end_pos>=0){ + /*Have we reached the end of the current response body?*/ + if(pos>=end_pos){ + OP_ASSERT(content_length>=0); + /*If this was the end of the stream, we're done. + Also return early if a non-blocking read was requested (regardless of + whether we might be able to parse the next response without + blocking).*/ + if(content_length<=end_pos)return 0; + /*Otherwise, start on the next response.*/ + if(next_pos<0){ + /*We haven't issued another request yet.*/ + if(!pipeline||_conn->nrequests_left<=0){ + /*There are two ways to get here: either the server told us it was + going to close the connection after the last request, or we + thought we were reading the whole resource, but it grew while we + were reading it. + The only way the latter could have happened is if content_length + changed while seeking. + Open a new request to read the rest.*/ + OP_ASSERT(_stream->seekable); + /*Try to open a new connection to read another chunk.*/ + op_http_conn_close(_stream,_conn,&_stream->lru_head,1); + /*If we're not pipelining, we should be requesting the rest.*/ + OP_ASSERT(pipeline||_conn->chunk_size==-1); + ret=op_http_conn_open_pos(_stream,_conn,end_pos,_conn->chunk_size); + if(OP_UNLIKELY(ret<0))return OP_EREAD; + } + else{ + /*Issue the request now (better late than never).*/ + ret=op_http_conn_send_request(_stream,_conn,pos,_conn->chunk_size,0); + if(OP_UNLIKELY(ret<0))return OP_EREAD; + next_pos=_conn->next_pos; + OP_ASSERT(next_pos>=0); + } + } + if(next_pos>=0){ + /*We shouldn't be trying to read past the current request body if we're + seeking somewhere else.*/ + OP_ASSERT(next_pos==end_pos); + ret=op_http_conn_handle_response(_stream,_conn); + if(OP_UNLIKELY(ret<0))return OP_EREAD; + if(OP_UNLIKELY(ret>0)&&pipeline){ + opus_int64 next_end; + next_end=_conn->next_end; + /*Our request timed out or the server closed the connection. + Try re-connecting.*/ + op_http_conn_close(_stream,_conn,&_stream->lru_head,1); + /*Unless there's a bug, we should be able to convert + (next_pos,next_end) into valid (_pos,_chunk_size) parameters.*/ + OP_ASSERT(next_end<0 + ||next_end-next_pos>=0&&next_end-next_pos<=OP_INT32_MAX); + ret=op_http_conn_open_pos(_stream,_conn,next_pos, + next_end<0?-1:(opus_int32)(next_end-next_pos)); + if(OP_UNLIKELY(ret<0))return OP_EREAD; + } + else if(OP_UNLIKELY(ret!=0))return OP_EREAD; + } + pos=_conn->pos; + end_pos=_conn->end_pos; + content_length=_stream->content_length; + } + OP_ASSERT(end_pos>pos); + _buf_size=OP_MIN(_buf_size,end_pos-pos); + } + nread=op_http_conn_read(_conn,(char *)_buf,_buf_size,1); + if(OP_UNLIKELY(nread<0))return nread; + pos+=nread; + _conn->pos=pos; + OP_ASSERT(end_pos<0||content_length>=0); + /*TODO: If nrequests_left<=0, we can't make a new request, and there will be + a big pause after we hit the end of the chunk while we open a new + connection. + It would be nice to be able to start that process now, but we have no way + to do it in the background without blocking (even if we could start it, we + have no guarantee the application will return control to us in a + sufficiently timely manner to allow us to complete it, and this is + uncommon enough that it's not worth using threads just for this).*/ + if(end_pos>=0&&end_pos<content_length&&next_pos<0 + &&pipeline&&OP_LIKELY(_conn->nrequests_left>0)){ + opus_int64 request_thresh; + opus_int32 chunk_size; + /*Are we getting close to the end of the current response body? + If so, we should request more data.*/ + request_thresh=_stream->connect_rate*_conn->read_rate>>12; + /*But don't commit ourselves too quickly.*/ + chunk_size=_conn->chunk_size; + if(chunk_size>=0)request_thresh=OP_MIN(chunk_size>>2,request_thresh); + if(end_pos-pos<request_thresh){ + ret=op_http_conn_send_request(_stream,_conn,end_pos,_conn->chunk_size,1); + if(OP_UNLIKELY(ret<0))return OP_EREAD; + } + } + return nread; +} + +static int op_http_stream_read(void *_stream, + unsigned char *_ptr,int _buf_size){ + OpusHTTPStream *stream; + ptrdiff_t nread; + opus_int64 size; + opus_int64 pos; + int ci; + stream=(OpusHTTPStream *)_stream; + /*Check for an empty read.*/ + if(_buf_size<=0)return 0; + ci=stream->cur_conni; + /*No current connection => EOF.*/ + if(ci<0)return 0; + pos=stream->conns[ci].pos; + size=stream->content_length; + /*Check for EOF.*/ + if(size>=0){ + if(pos>=size)return 0; + /*Check for a short read.*/ + if(_buf_size>size-pos)_buf_size=(int)(size-pos); + } + nread=op_http_conn_read_body(stream,stream->conns+ci,_ptr,_buf_size); + if(OP_UNLIKELY(nread<=0)){ + /*We hit an error or EOF. + Either way, we're done with this connection.*/ + op_http_conn_close(stream,stream->conns+ci,&stream->lru_head,1); + stream->cur_conni=-1; + stream->pos=pos; + } + return nread; +} + +/*Discard data until we reach the _target position. + This destroys the contents of _stream->response.buf, as we need somewhere to + read this data, and that is a convenient place. + _just_read_ahead: Whether or not this is a plain fast-forward. + If 0, we need to issue a new request for a chunk at _target + and discard all the data from our current request(s). + Otherwise, we should be able to reach _target without + issuing any new requests. + _target: The stream position to which to read ahead.*/ +static int op_http_conn_read_ahead(OpusHTTPStream *_stream, + OpusHTTPConn *_conn,int _just_read_ahead,opus_int64 _target){ + opus_int64 pos; + opus_int64 end_pos; + opus_int64 next_pos; + opus_int64 next_end; + ptrdiff_t nread; + int ret; + pos=_conn->pos; + end_pos=_conn->end_pos; + next_pos=_conn->next_pos; + next_end=_conn->next_end; + if(!_just_read_ahead){ + /*We need to issue a new pipelined request. + This is the only case where we allow more than one outstanding request + at a time, so we need to reset next_pos (we'll restore it below if we + did have an outstanding request).*/ + OP_ASSERT(_stream->pipeline); + _conn->next_pos=-1; + ret=op_http_conn_send_request(_stream,_conn,_target, + OP_PIPELINE_CHUNK_SIZE,0); + if(OP_UNLIKELY(ret<0))return ret; + } + /*We can reach the target position by reading forward in the current chunk.*/ + if(_just_read_ahead&&(end_pos<0||_target<end_pos))end_pos=_target; + else if(next_pos>=0){ + opus_int64 next_next_pos; + opus_int64 next_next_end; + /*We already have a request outstanding. + Finish off the current chunk.*/ + while(pos<end_pos){ + nread=op_http_conn_read(_conn,_stream->response.buf, + (int)OP_MIN(end_pos-pos,_stream->response.cbuf),1); + /*We failed to read ahead.*/ + if(nread<=0)return OP_FALSE; + pos+=nread; + } + OP_ASSERT(pos==end_pos); + if(_just_read_ahead){ + next_next_pos=next_next_end=-1; + end_pos=_target; + } + else{ + OP_ASSERT(_conn->next_pos==_target); + next_next_pos=_target; + next_next_end=_conn->next_end; + _conn->next_pos=next_pos; + _conn->next_end=next_end; + end_pos=next_end; + } + ret=op_http_conn_handle_response(_stream,_conn); + if(OP_UNLIKELY(ret!=0))return OP_FALSE; + _conn->next_pos=next_next_pos; + _conn->next_end=next_next_end; + } + while(pos<end_pos){ + nread=op_http_conn_read(_conn,_stream->response.buf, + (int)OP_MIN(end_pos-pos,_stream->response.cbuf),1); + /*We failed to read ahead.*/ + if(nread<=0)return OP_FALSE; + pos+=nread; + } + OP_ASSERT(pos==end_pos); + if(!_just_read_ahead){ + ret=op_http_conn_handle_response(_stream,_conn); + if(OP_UNLIKELY(ret!=0))return OP_FALSE; + } + else _conn->pos=end_pos; + OP_ASSERT(_conn->pos==_target); + return 0; +} + +static int op_http_stream_seek(void *_stream,opus_int64 _offset,int _whence){ + struct timeb seek_time; + OpusHTTPStream *stream; + OpusHTTPConn *conn; + OpusHTTPConn **pnext; + OpusHTTPConn *close_conn; + OpusHTTPConn **close_pnext; + opus_int64 content_length; + opus_int64 pos; + int pipeline; + int ci; + int ret; + stream=(OpusHTTPStream *)_stream; + if(!stream->seekable)return -1; + content_length=stream->content_length; + /*If we're seekable, we should have gotten a Content-Length.*/ + OP_ASSERT(content_length>=0); + ci=stream->cur_conni; + pos=ci<0?content_length:stream->conns[ci].pos; + switch(_whence){ + case SEEK_SET:{ + /*Check for overflow:*/ + if(_offset<0)return -1; + pos=_offset; + }break; + case SEEK_CUR:{ + /*Check for overflow:*/ + if(_offset<-pos||_offset>OP_INT64_MAX-pos)return -1; + pos+=_offset; + }break; + case SEEK_END:{ + /*Check for overflow:*/ + if(_offset>content_length||_offset<content_length-OP_INT64_MAX)return -1; + pos=content_length-_offset; + }break; + default:return -1; + } + /*Mark when we deactivated the active connection.*/ + if(ci>=0){ + op_http_conn_read_rate_update(stream->conns+ci); + *&seek_time=*&stream->conns[ci].read_time; + } + else ftime(&seek_time); + /*If we seeked past the end of the stream, just disable the active + connection.*/ + if(pos>=content_length){ + stream->cur_conni=-1; + stream->pos=pos; + return 0; + } + /*First try to find a connection we can use without waiting.*/ + pnext=&stream->lru_head; + conn=stream->lru_head; + while(conn!=NULL){ + opus_int64 conn_pos; + opus_int64 end_pos; + int available; + /*If this connection has been dormant too long or has made too many + requests, close it. + This is to prevent us from hitting server limits/firewall timeouts.*/ + if(op_time_diff_ms(&seek_time,&conn->read_time)> + OP_CONNECTION_IDLE_TIMEOUT_MS + ||conn->nrequests_left<OP_PIPELINE_MIN_REQUESTS){ + op_http_conn_close(stream,conn,pnext,1); + conn=*pnext; + continue; + } + available=op_http_conn_estimate_available(conn); + conn_pos=conn->pos; + end_pos=conn->end_pos; + if(conn->next_pos>=0){ + OP_ASSERT(end_pos>=0); + OP_ASSERT(conn->next_pos==end_pos); + end_pos=conn->next_end; + } + OP_ASSERT(end_pos<0||conn_pos<=end_pos); + /*Can we quickly read ahead without issuing a new request or waiting for + any more data? + If we have an oustanding request, we'll over-estimate the amount of data + it has available (because we'll count the response headers, too), but + that probably doesn't matter.*/ + if(conn_pos<=pos&&pos-conn_pos<=available&&(end_pos<0||pos<end_pos)){ + /*Found a suitable connection to re-use.*/ + ret=op_http_conn_read_ahead(stream,conn,1,pos); + if(OP_UNLIKELY(ret<0)){ + /*The connection might have become stale, so close it and keep going.*/ + op_http_conn_close(stream,conn,pnext,1); + conn=*pnext; + continue; + } + /*Sucessfully resurrected this connection.*/ + *pnext=conn->next; + conn->next=stream->lru_head; + stream->lru_head=conn; + stream->cur_conni=conn-stream->conns; + return 0; + } + pnext=&conn->next; + conn=conn->next; + } + /*Chances are that didn't work, so now try to find one we can use by reading + ahead a reasonable amount and/or by issuing a new request.*/ + close_pnext=NULL; + close_conn=NULL; + pnext=&stream->lru_head; + conn=stream->lru_head; + pipeline=stream->pipeline; + while(conn!=NULL){ + opus_int64 conn_pos; + opus_int64 end_pos; + opus_int64 read_ahead_thresh; + int available; + int just_read_ahead; + /*Dividing by 2048 instead of 1000 scales this by nearly 1/2, biasing away + from connection re-use (and roughly compensating for the lag required to + reopen the TCP window of a connection that's been idle). + There's no overflow checking here, because it's vanishingly unlikely, and + all it would do is cause us to make poor decisions.*/ + read_ahead_thresh=OP_MAX(OP_READAHEAD_THRESH_MIN, + stream->connect_rate*conn->read_rate>>11); + available=op_http_conn_estimate_available(conn); + conn_pos=conn->pos; + end_pos=conn->end_pos; + if(conn->next_pos>=0){ + OP_ASSERT(end_pos>=0); + OP_ASSERT(conn->next_pos==end_pos); + end_pos=conn->next_end; + } + OP_ASSERT(end_pos<0||conn_pos<=end_pos); + /*Can we quickly read ahead without issuing a new request?*/ + just_read_ahead=conn_pos<=pos&&pos-conn_pos-available<=read_ahead_thresh + &&(end_pos<0||pos<end_pos); + if(just_read_ahead||pipeline&&end_pos>=0 + &&end_pos-conn_pos-available<=read_ahead_thresh){ + /*Found a suitable connection to re-use.*/ + ret=op_http_conn_read_ahead(stream,conn,just_read_ahead,pos); + if(OP_UNLIKELY(ret<0)){ + /*The connection might have become stale, so close it and keep going.*/ + op_http_conn_close(stream,conn,pnext,1); + conn=*pnext; + continue; + } + /*Sucessfully resurrected this connection.*/ + *pnext=conn->next; + conn->next=stream->lru_head; + stream->lru_head=conn; + stream->cur_conni=conn-stream->conns; + return 0; + } + close_pnext=pnext; + close_conn=conn; + pnext=&conn->next; + conn=conn->next; + } + /*No suitable connections. + Open a new one.*/ + if(stream->free_head==NULL){ + /*All connections in use. + Expire one of them (we should have already picked which one when scanning + the list).*/ + OP_ASSERT(close_conn!=NULL); + OP_ASSERT(close_pnext!=NULL); + op_http_conn_close(stream,close_conn,close_pnext,1); + } + OP_ASSERT(stream->free_head!=NULL); + conn=stream->free_head; + /*If we can pipeline, only request a chunk of data. + If we're seeking now, there's a good chance we will want to seek again + soon, and this avoids committing this connection to reading the rest of + the stream. + Particularly with SSL or proxies, issuing a new request on the same + connection can be substantially faster than opening a new one. + This also limits the amount of data the server will blast at us on this + connection if we later seek elsewhere and start reading from a different + connection.*/ + ret=op_http_conn_open_pos(stream,conn,pos, + pipeline?OP_PIPELINE_CHUNK_SIZE:-1); + if(OP_UNLIKELY(ret<0)){ + op_http_conn_close(stream,conn,&stream->lru_head,1); + return -1; + } + return 0; +} + +static opus_int64 op_http_stream_tell(void *_stream){ + OpusHTTPStream *stream; + int ci; + stream=(OpusHTTPStream *)_stream; + ci=stream->cur_conni; + return ci<0?stream->pos:stream->conns[ci].pos; +} + +static int op_http_stream_close(void *_stream){ + OpusHTTPStream *stream; + stream=(OpusHTTPStream *)_stream; + if(OP_LIKELY(stream!=NULL)){ + op_http_stream_clear(stream); + _ogg_free(stream); + } + return 0; +} + +static const OpusFileCallbacks OP_HTTP_CALLBACKS={ + op_http_stream_read, + op_http_stream_seek, + op_http_stream_tell, + op_http_stream_close +}; +#endif + +void opus_server_info_init(OpusServerInfo *_info){ + _info->name=NULL; + _info->description=NULL; + _info->genre=NULL; + _info->url=NULL; + _info->server=NULL; + _info->content_type=NULL; + _info->bitrate_kbps=-1; + _info->is_public=-1; + _info->is_ssl=0; +} + +void opus_server_info_clear(OpusServerInfo *_info){ + _ogg_free(_info->content_type); + _ogg_free(_info->server); + _ogg_free(_info->url); + _ogg_free(_info->genre); + _ogg_free(_info->description); + _ogg_free(_info->name); +} + +/*The actual URL stream creation function. + This one isn't extensible like the application-level interface, but because + it isn't public, we're free to change it in the future.*/ +static void *op_url_stream_create_impl(OpusFileCallbacks *_cb,const char *_url, + int _skip_certificate_check,const char *_proxy_host,unsigned _proxy_port, + const char *_proxy_user,const char *_proxy_pass,OpusServerInfo *_info){ + const char *path; + /*Check to see if this is a valid file: URL.*/ + path=op_parse_file_url(_url); + if(path!=NULL){ + char *unescaped_path; + void *ret; + unescaped_path=op_string_dup(path); + if(OP_UNLIKELY(unescaped_path==NULL))return NULL; + ret=op_fopen(_cb,op_unescape_url_component(unescaped_path),"rb"); + _ogg_free(unescaped_path); + return ret; + } +#if defined(OP_ENABLE_HTTP) + /*If not, try http/https.*/ + else{ + OpusHTTPStream *stream; + int ret; + stream=(OpusHTTPStream *)_ogg_malloc(sizeof(*stream)); + if(OP_UNLIKELY(stream==NULL))return NULL; + op_http_stream_init(stream); + ret=op_http_stream_open(stream,_url,_skip_certificate_check, + _proxy_host,_proxy_port,_proxy_user,_proxy_pass,_info); + if(OP_UNLIKELY(ret<0)){ + op_http_stream_clear(stream); + _ogg_free(stream); + return NULL; + } + *_cb=*&OP_HTTP_CALLBACKS; + return stream; + } +#else + (void)_skip_certificate_check; + (void)_proxy_host; + (void)_proxy_port; + (void)_proxy_user; + (void)_proxy_pass; + (void)_info; + return NULL; +#endif +} + +void *op_url_stream_vcreate(OpusFileCallbacks *_cb, + const char *_url,va_list _ap){ + int skip_certificate_check; + const char *proxy_host; + opus_int32 proxy_port; + const char *proxy_user; + const char *proxy_pass; + OpusServerInfo *pinfo; + skip_certificate_check=0; + proxy_host=NULL; + proxy_port=8080; + proxy_user=NULL; + proxy_pass=NULL; + pinfo=NULL; + for(;;){ + ptrdiff_t request; + request=va_arg(_ap,char *)-(char *)NULL; + /*If we hit NULL, we're done processing options.*/ + if(!request)break; + switch(request){ + case OP_SSL_SKIP_CERTIFICATE_CHECK_REQUEST:{ + skip_certificate_check=!!va_arg(_ap,opus_int32); + }break; + case OP_HTTP_PROXY_HOST_REQUEST:{ + proxy_host=va_arg(_ap,const char *); + }break; + case OP_HTTP_PROXY_PORT_REQUEST:{ + proxy_port=va_arg(_ap,opus_int32); + if(proxy_port<0||proxy_port>(opus_int32)65535)return NULL; + }break; + case OP_HTTP_PROXY_USER_REQUEST:{ + proxy_user=va_arg(_ap,const char *); + }break; + case OP_HTTP_PROXY_PASS_REQUEST:{ + proxy_pass=va_arg(_ap,const char *); + }break; + case OP_GET_SERVER_INFO_REQUEST:{ + pinfo=va_arg(_ap,OpusServerInfo *); + }break; + /*Some unknown option.*/ + default:return NULL; + } + } + /*If the caller has requested server information, proxy it to a local copy to + simplify error handling.*/ + if(pinfo!=NULL){ + OpusServerInfo info; + void *ret; + opus_server_info_init(&info); + ret=op_url_stream_create_impl(_cb,_url,skip_certificate_check, + proxy_host,proxy_port,proxy_user,proxy_pass,&info); + if(ret!=NULL)*pinfo=*&info; + else opus_server_info_clear(&info); + return ret; + } + return op_url_stream_create_impl(_cb,_url,skip_certificate_check, + proxy_host,proxy_port,proxy_user,proxy_pass,NULL); +} + +void *op_url_stream_create(OpusFileCallbacks *_cb, + const char *_url,...){ + va_list ap; + void *ret; + va_start(ap,_url); + ret=op_url_stream_vcreate(_cb,_url,ap); + va_end(ap); + return ret; +} + +/*Convenience routines to open/test URLs in a single step.*/ + +OggOpusFile *op_vopen_url(const char *_url,int *_error,va_list _ap){ + OpusFileCallbacks cb; + OggOpusFile *of; + void *source; + source=op_url_stream_vcreate(&cb,_url,_ap); + if(OP_UNLIKELY(source==NULL)){ + if(_error!=NULL)*_error=OP_EFAULT; + return NULL; + } + of=op_open_callbacks(source,&cb,NULL,0,_error); + if(OP_UNLIKELY(of==NULL))(*cb.close)(source); + return of; +} + +OggOpusFile *op_open_url(const char *_url,int *_error,...){ + OggOpusFile *ret; + va_list ap; + va_start(ap,_error); + ret=op_vopen_url(_url,_error,ap); + va_end(ap); + return ret; +} + +OggOpusFile *op_vtest_url(const char *_url,int *_error,va_list _ap){ + OpusFileCallbacks cb; + OggOpusFile *of; + void *source; + source=op_url_stream_vcreate(&cb,_url,_ap); + if(OP_UNLIKELY(source==NULL)){ + if(_error!=NULL)*_error=OP_EFAULT; + return NULL; + } + of=op_test_callbacks(source,&cb,NULL,0,_error); + if(OP_UNLIKELY(of==NULL))(*cb.close)(source); + return of; +} + +OggOpusFile *op_test_url(const char *_url,int *_error,...){ + OggOpusFile *ret; + va_list ap; + va_start(ap,_error); + ret=op_vtest_url(_url,_error,ap); + va_end(ap); + return ret; +} |