diff options
Diffstat (limited to 'thirdparty/libwebsockets/server/server.c')
| -rw-r--r-- | thirdparty/libwebsockets/server/server.c | 3025 |
1 files changed, 3025 insertions, 0 deletions
diff --git a/thirdparty/libwebsockets/server/server.c b/thirdparty/libwebsockets/server/server.c new file mode 100644 index 0000000000..db05954257 --- /dev/null +++ b/thirdparty/libwebsockets/server/server.c @@ -0,0 +1,3025 @@ +/* + * libwebsockets - small server side websockets and web server implementation + * + * Copyright (C) 2010-2017 Andy Green <andy@warmcat.com> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation: + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301 USA + */ + +#include "private-libwebsockets.h" + +const char * const method_names[] = { + "GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE", "CONNECT", "HEAD", +#ifdef LWS_WITH_HTTP2 + ":path", +#endif + }; + +#if defined (LWS_WITH_ESP8266) +#undef memcpy +void *memcpy(void *dest, const void *src, size_t n) +{ + return ets_memcpy(dest, src, n); +} +#endif + +int +lws_context_init_server(struct lws_context_creation_info *info, + struct lws_vhost *vhost) +{ +#if LWS_POSIX + int n, opt = 1, limit = 1; +#endif + lws_sockfd_type sockfd; + struct lws_vhost *vh; + struct lws *wsi; + int m = 0; + + (void)method_names; + (void)opt; + /* set up our external listening socket we serve on */ + + if (info->port == CONTEXT_PORT_NO_LISTEN || + info->port == CONTEXT_PORT_NO_LISTEN_SERVER) + return 0; + + vh = vhost->context->vhost_list; + while (vh) { + if (vh->listen_port == info->port) { + if ((!info->iface && !vh->iface) || + (info->iface && vh->iface && + !strcmp(info->iface, vh->iface))) { + vhost->listen_port = info->port; + vhost->iface = info->iface; + lwsl_notice(" using listen skt from vhost %s\n", + vh->name); + return 0; + } + } + vh = vh->vhost_next; + } + +#if LWS_POSIX + (void)n; +#if defined(__linux__) + limit = vhost->context->count_threads; +#endif + + for (m = 0; m < limit; m++) { +#ifdef LWS_WITH_UNIX_SOCK + if (LWS_UNIX_SOCK_ENABLED(vhost)) + sockfd = socket(AF_UNIX, SOCK_STREAM, 0); + else +#endif +#ifdef LWS_WITH_IPV6 + if (LWS_IPV6_ENABLED(vhost)) + sockfd = socket(AF_INET6, SOCK_STREAM, 0); + else +#endif + sockfd = socket(AF_INET, SOCK_STREAM, 0); + + if (sockfd == -1) { +#else +#if defined(LWS_WITH_ESP8266) + sockfd = esp8266_create_tcp_listen_socket(vhost); + if (!lws_sockfd_valid(sockfd)) { +#endif +#endif + lwsl_err("ERROR opening socket\n"); + return 1; + } +#if LWS_POSIX && !defined(LWS_WITH_ESP32) + +#if (defined(WIN32) || defined(_WIN32)) && defined(SO_EXCLUSIVEADDRUSE) + /* + * only accept that we are the only listener on the port + * https://msdn.microsoft.com/zh-tw/library/ + * windows/desktop/ms740621(v=vs.85).aspx + * + * for lws, to match Linux, we default to exclusive listen + */ + if (!lws_check_opt(vhost->options, + LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE)) { + if (setsockopt(sockfd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, + (const void *)&opt, sizeof(opt)) < 0) { + lwsl_err("reuseaddr failed\n"); + compatible_close(sockfd); + return 1; + } + } else +#endif + + /* + * allow us to restart even if old sockets in TIME_WAIT + */ + if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, + (const void *)&opt, sizeof(opt)) < 0) { + lwsl_err("reuseaddr failed\n"); + compatible_close(sockfd); + return 1; + } + +#if defined(LWS_WITH_IPV6) && defined(IPV6_V6ONLY) + if (LWS_IPV6_ENABLED(vhost)) { + if (vhost->options & LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY) { + int value = (vhost->options & + LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE) ? 1 : 0; + if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, + (const void*)&value, sizeof(value)) < 0) { + compatible_close(sockfd); + return 1; + } + } + } +#endif + +#if defined(__linux__) && defined(SO_REUSEPORT) + n = lws_check_opt(vhost->options, LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE); +#if LWS_MAX_SMP > 1 + n = 1; +#endif + + if (n) + if (vhost->context->count_threads > 1) + if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT, + (const void *)&opt, sizeof(opt)) < 0) { + compatible_close(sockfd); + return 1; + } +#endif +#endif + lws_plat_set_socket_options(vhost, sockfd); + +#if LWS_POSIX + n = lws_socket_bind(vhost, sockfd, info->port, info->iface); + if (n < 0) + goto bail; + info->port = n; +#endif + vhost->listen_port = info->port; + vhost->iface = info->iface; + + wsi = lws_zalloc(sizeof(struct lws), "listen wsi"); + if (wsi == NULL) { + lwsl_err("Out of mem\n"); + goto bail; + } + wsi->context = vhost->context; + wsi->desc.sockfd = sockfd; + wsi->mode = LWSCM_SERVER_LISTENER; + wsi->protocol = vhost->protocols; + wsi->tsi = m; + wsi->vhost = vhost; + wsi->listener = 1; + +#ifdef LWS_WITH_LIBUV + if (LWS_LIBUV_ENABLED(vhost->context)) + lws_uv_initvhost(vhost, wsi); +#endif + + if (insert_wsi_socket_into_fds(vhost->context, wsi)) + goto bail; + + vhost->context->count_wsi_allocated++; + vhost->lserv_wsi = wsi; + +#if LWS_POSIX + n = listen(wsi->desc.sockfd, LWS_SOMAXCONN); + if (n < 0) { + lwsl_err("listen failed with error %d\n", LWS_ERRNO); + vhost->lserv_wsi = NULL; + vhost->context->count_wsi_allocated--; + remove_wsi_socket_from_fds(wsi); + goto bail; + } + } /* for each thread able to independently listen */ +#else +#if defined(LWS_WITH_ESP8266) + esp8266_tcp_stream_bind(wsi->desc.sockfd, info->port, wsi); +#endif +#endif + if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS)) { +#ifdef LWS_WITH_UNIX_SOCK + if (LWS_UNIX_SOCK_ENABLED(vhost)) + lwsl_info(" Listening on \"%s\"\n", info->iface); + else +#endif + lwsl_info(" Listening on port %d\n", info->port); + } + + return 0; + +bail: + compatible_close(sockfd); + + return 1; +} + +#if defined(LWS_WITH_ESP8266) +#undef strchr +#define strchr ets_strchr +#endif + +struct lws_vhost * +lws_select_vhost(struct lws_context *context, int port, const char *servername) +{ + struct lws_vhost *vhost = context->vhost_list; + const char *p; + int n, m, colon; + + n = strlen(servername); + colon = n; + p = strchr(servername, ':'); + if (p) + colon = p - servername; + + /* Priotity 1: first try exact matches */ + + while (vhost) { + if (port == vhost->listen_port && + !strncmp(vhost->name, servername, colon)) { + lwsl_info("SNI: Found: %s\n", servername); + return vhost; + } + vhost = vhost->vhost_next; + } + + /* + * Priority 2: if no exact matches, try matching *.vhost-name + * unintentional matches are possible but resolve to x.com for *.x.com + * which is reasonable. If exact match exists we already chose it and + * never reach here. SSL will still fail it if the cert doesn't allow + * *.x.com. + */ + vhost = context->vhost_list; + while (vhost) { + m = strlen(vhost->name); + if (port == vhost->listen_port && + m <= (colon - 2) && + servername[colon - m - 1] == '.' && + !strncmp(vhost->name, servername + colon - m, m)) { + lwsl_info("SNI: Found %s on wildcard: %s\n", + servername, vhost->name); + return vhost; + } + vhost = vhost->vhost_next; + } + + /* Priority 3: match the first vhost on our port */ + + vhost = context->vhost_list; + while (vhost) { + if (port == vhost->listen_port) { + lwsl_info("vhost match to %s based on port %d\n", + vhost->name, port); + return vhost; + } + vhost = vhost->vhost_next; + } + + /* no match */ + + return NULL; +} + +LWS_VISIBLE LWS_EXTERN const char * +lws_get_mimetype(const char *file, const struct lws_http_mount *m) +{ + int n = strlen(file); + const struct lws_protocol_vhost_options *pvo = NULL; + + if (m) + pvo = m->extra_mimetypes; + + if (n < 5) + return NULL; + + if (!strcmp(&file[n - 4], ".ico")) + return "image/x-icon"; + + if (!strcmp(&file[n - 4], ".gif")) + return "image/gif"; + + if (!strcmp(&file[n - 3], ".js")) + return "text/javascript"; + + if (!strcmp(&file[n - 4], ".png")) + return "image/png"; + + if (!strcmp(&file[n - 4], ".jpg")) + return "image/jpeg"; + + if (!strcmp(&file[n - 3], ".gz")) + return "application/gzip"; + + if (!strcmp(&file[n - 4], ".JPG")) + return "image/jpeg"; + + if (!strcmp(&file[n - 5], ".html")) + return "text/html"; + + if (!strcmp(&file[n - 4], ".css")) + return "text/css"; + + if (!strcmp(&file[n - 4], ".txt")) + return "text/plain"; + + if (!strcmp(&file[n - 4], ".svg")) + return "image/svg+xml"; + + if (!strcmp(&file[n - 4], ".ttf")) + return "application/x-font-ttf"; + + if (!strcmp(&file[n - 4], ".otf")) + return "application/font-woff"; + + if (!strcmp(&file[n - 5], ".woff")) + return "application/font-woff"; + + if (!strcmp(&file[n - 4], ".xml")) + return "application/xml"; + + while (pvo) { + if (pvo->name[0] == '*') /* ie, match anything */ + return pvo->value; + + if (!strcmp(&file[n - strlen(pvo->name)], pvo->name)) + return pvo->value; + + pvo = pvo->next; + } + + return NULL; +} +static lws_fop_flags_t +lws_vfs_prepare_flags(struct lws *wsi) +{ + lws_fop_flags_t f = 0; + + if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_ACCEPT_ENCODING)) + return f; + + if (strstr(lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_ACCEPT_ENCODING), + "gzip")) { + lwsl_info("client indicates GZIP is acceptable\n"); + f |= LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP; + } + + return f; +} + +static int +lws_http_serve(struct lws *wsi, char *uri, const char *origin, + const struct lws_http_mount *m) +{ + const struct lws_protocol_vhost_options *pvo = m->interpret; + struct lws_process_html_args args; + const char *mimetype; +#if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266) + const struct lws_plat_file_ops *fops; + const char *vpath; + lws_fop_flags_t fflags = LWS_O_RDONLY; +#if defined(WIN32) && defined(LWS_HAVE__STAT32I64) + struct _stat32i64 st; +#else + struct stat st; +#endif + int spin = 0; +#endif + char path[256], sym[512]; + unsigned char *p = (unsigned char *)sym + 32 + LWS_PRE, *start = p; + unsigned char *end = p + sizeof(sym) - 32 - LWS_PRE; +#if !defined(WIN32) && LWS_POSIX && !defined(LWS_WITH_ESP32) + size_t len; +#endif + int n; + + lws_snprintf(path, sizeof(path) - 1, "%s/%s", origin, uri); + +#if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266) + + fflags |= lws_vfs_prepare_flags(wsi); + + do { + spin++; + fops = lws_vfs_select_fops(wsi->context->fops, path, &vpath); + + if (wsi->u.http.fop_fd) + lws_vfs_file_close(&wsi->u.http.fop_fd); + + wsi->u.http.fop_fd = fops->LWS_FOP_OPEN(wsi->context->fops, + path, vpath, &fflags); + if (!wsi->u.http.fop_fd) { + lwsl_err("Unable to open '%s'\n", path); + + return -1; + } + + /* if it can't be statted, don't try */ + if (fflags & LWS_FOP_FLAG_VIRTUAL) + break; +#if defined(LWS_WITH_ESP32) + break; +#endif +#if !defined(WIN32) + if (fstat(wsi->u.http.fop_fd->fd, &st)) { + lwsl_info("unable to stat %s\n", path); + goto bail; + } +#else +#if defined(LWS_HAVE__STAT32I64) + if (_stat32i64(path, &st)) { + lwsl_info("unable to stat %s\n", path); + goto bail; + } +#else + if (stat(path, &st)) { + lwsl_info("unable to stat %s\n", path); + goto bail; + } +#endif +#endif + + wsi->u.http.fop_fd->mod_time = (uint32_t)st.st_mtime; + fflags |= LWS_FOP_FLAG_MOD_TIME_VALID; + +#if !defined(WIN32) && LWS_POSIX && !defined(LWS_WITH_ESP32) + if ((S_IFMT & st.st_mode) == S_IFLNK) { + len = readlink(path, sym, sizeof(sym) - 1); + if (len) { + lwsl_err("Failed to read link %s\n", path); + goto bail; + } + sym[len] = '\0'; + lwsl_debug("symlink %s -> %s\n", path, sym); + lws_snprintf(path, sizeof(path) - 1, "%s", sym); + } +#endif + if ((S_IFMT & st.st_mode) == S_IFDIR) { + lwsl_debug("default filename append to dir\n"); + lws_snprintf(path, sizeof(path) - 1, "%s/%s/index.html", + origin, uri); + } + + } while ((S_IFMT & st.st_mode) != S_IFREG && spin < 5); + + if (spin == 5) + lwsl_err("symlink loop %s \n", path); + + n = sprintf(sym, "%08llX%08lX", + (unsigned long long)lws_vfs_get_length(wsi->u.http.fop_fd), + (unsigned long)lws_vfs_get_mod_time(wsi->u.http.fop_fd)); + + /* disable ranges if IF_RANGE token invalid */ + + if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_RANGE)) + if (strcmp(sym, lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_IF_RANGE))) + /* differs - defeat Range: */ + wsi->u.http.ah->frag_index[WSI_TOKEN_HTTP_RANGE] = 0; + + if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_NONE_MATCH)) { + /* + * he thinks he has some version of it already, + * check if the tag matches + */ + if (!strcmp(sym, lws_hdr_simple_ptr(wsi, + WSI_TOKEN_HTTP_IF_NONE_MATCH))) { + + lwsl_debug("%s: ETAG match %s %s\n", __func__, + uri, origin); + + /* we don't need to send the payload */ + if (lws_add_http_header_status(wsi, + HTTP_STATUS_NOT_MODIFIED, &p, end)) + return -1; + + if (lws_add_http_header_by_token(wsi, + WSI_TOKEN_HTTP_ETAG, + (unsigned char *)sym, n, &p, end)) + return -1; + + if (lws_finalize_http_header(wsi, &p, end)) + return -1; + + n = lws_write(wsi, start, p - start, + LWS_WRITE_HTTP_HEADERS | + LWS_WRITE_H2_STREAM_END); + if (n != (p - start)) { + lwsl_err("_write returned %d from %ld\n", n, + (long)(p - start)); + return -1; + } + + lws_vfs_file_close(&wsi->u.http.fop_fd); + + return lws_http_transaction_completed(wsi); + } + } + + if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ETAG, + (unsigned char *)sym, n, &p, end)) + return -1; +#endif + + mimetype = lws_get_mimetype(path, m); + if (!mimetype) { + lwsl_err("unknown mimetype for %s\n", path); + goto bail; + } + if (!mimetype[0]) + lwsl_debug("sending no mimetype for %s\n", path); + + wsi->sending_chunked = 0; + + /* + * check if this is in the list of file suffixes to be interpreted by + * a protocol + */ + while (pvo) { + n = strlen(path); + if (n > (int)strlen(pvo->name) && + !strcmp(&path[n - strlen(pvo->name)], pvo->name)) { + wsi->sending_chunked = 1; + wsi->protocol_interpret_idx = + (char)(lws_intptr_t)pvo->value; + lwsl_info("want %s interpreted by %s\n", path, + wsi->vhost->protocols[ + (int)(lws_intptr_t)(pvo->value)].name); + wsi->protocol = &wsi->vhost->protocols[ + (int)(lws_intptr_t)(pvo->value)]; + if (lws_ensure_user_space(wsi)) + return -1; + break; + } + pvo = pvo->next; + } + + if (m->protocol) { + const struct lws_protocols *pp = lws_vhost_name_to_protocol( + wsi->vhost, m->protocol); + + if (lws_bind_protocol(wsi, pp)) + return 1; + args.p = (char *)p; + args.max_len = end - p; + if (pp->callback(wsi, LWS_CALLBACK_ADD_HEADERS, + wsi->user_space, &args, 0)) + return -1; + p = (unsigned char *)args.p; + } + + n = lws_serve_http_file(wsi, path, mimetype, (char *)start, p - start); + + if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi))) + return -1; /* error or can't reuse connection: close the socket */ + + return 0; +bail: + + return -1; +} + +const struct lws_http_mount * +lws_find_mount(struct lws *wsi, const char *uri_ptr, int uri_len) +{ + const struct lws_http_mount *hm, *hit = NULL; + int best = 0; + + hm = wsi->vhost->mount_list; + while (hm) { + if (uri_len >= hm->mountpoint_len && + !strncmp(uri_ptr, hm->mountpoint, hm->mountpoint_len) && + (uri_ptr[hm->mountpoint_len] == '\0' || + uri_ptr[hm->mountpoint_len] == '/' || + hm->mountpoint_len == 1) + ) { + if (hm->origin_protocol == LWSMPRO_CALLBACK || + ((hm->origin_protocol == LWSMPRO_CGI || + lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI) || + (wsi->http2_substream && + lws_hdr_total_length(wsi, + WSI_TOKEN_HTTP_COLON_PATH)) || + hm->protocol) && + hm->mountpoint_len > best)) { + best = hm->mountpoint_len; + hit = hm; + } + } + hm = hm->mount_next; + } + + return hit; +} + +#if LWS_POSIX + +static int +lws_find_string_in_file(const char *filename, const char *string, int stringlen) +{ + char buf[128]; + int fd, match = 0, pos = 0, n = 0, hit = 0; + + fd = open(filename, O_RDONLY); + if (fd < 0) { + lwsl_err("can't open auth file: %s\n", filename); + return 1; + } + + while (1) { + if (pos == n) { + n = read(fd, buf, sizeof(buf)); + if (n <= 0) { + if (match == stringlen) + hit = 1; + break; + } + pos = 0; + } + + if (match == stringlen) { + if (buf[pos] == '\r' || buf[pos] == '\n') { + hit = 1; + break; + } + match = 0; + } + + if (buf[pos] == string[match]) + match++; + else + match = 0; + + pos++; + } + + close(fd); + + return hit; +} + +static int +lws_unauthorised_basic_auth(struct lws *wsi) +{ + struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi]; + unsigned char *start = pt->serv_buf + LWS_PRE, + *p = start, *end = p + 512; + char buf[64]; + int n; + + /* no auth... tell him it is required */ + + if (lws_add_http_header_status(wsi, HTTP_STATUS_UNAUTHORIZED, &p, end)) + return -1; + + n = lws_snprintf(buf, sizeof(buf), "Basic realm=\"lwsws\""); + if (lws_add_http_header_by_token(wsi, + WSI_TOKEN_HTTP_WWW_AUTHENTICATE, + (unsigned char *)buf, n, &p, end)) + return -1; + + if (lws_finalize_http_header(wsi, &p, end)) + return -1; + + n = lws_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS | + LWS_WRITE_H2_STREAM_END); + if (n < 0) + return -1; + + return lws_http_transaction_completed(wsi); + +} + +#endif + +int lws_clean_url(char *p) +{ + if (p[0] == 'h' && p[1] == 't' && p[2] == 't' && p[3] == 'p') { + p += 4; + if (*p == 's') + p++; + if (*p == ':') { + p++; + if (*p == '/') + p++; + } + } + + while (*p) { + if (p[0] == '/' && p[1] == '/') { + char *p1 = p; + while (*p1) { + *p1 = p1[1]; + p1++; + } + continue; + } + p++; + } + + return 0; +} + + +static const unsigned char methods[] = { + WSI_TOKEN_GET_URI, + WSI_TOKEN_POST_URI, + WSI_TOKEN_OPTIONS_URI, + WSI_TOKEN_PUT_URI, + WSI_TOKEN_PATCH_URI, + WSI_TOKEN_DELETE_URI, + WSI_TOKEN_CONNECT, + WSI_TOKEN_HEAD_URI, +#ifdef LWS_WITH_HTTP2 + WSI_TOKEN_HTTP_COLON_PATH, +#endif +}; + +static int +lws_http_get_uri_and_method(struct lws *wsi, char **puri_ptr, int *puri_len) +{ + int n, count = 0; + + for (n = 0; n < ARRAY_SIZE(methods); n++) + if (lws_hdr_total_length(wsi, methods[n])) + count++; + if (!count) { + lwsl_warn("Missing URI in HTTP request\n"); + return -1; + } + + if (count != 1 && + !(wsi->http2_substream && + lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COLON_PATH))) { + lwsl_warn("multiple methods?\n"); + return -1; + } + + for (n = 0; n < ARRAY_SIZE(methods); n++) + if (lws_hdr_total_length(wsi, methods[n])) { + *puri_ptr = lws_hdr_simple_ptr(wsi, methods[n]); + *puri_len = lws_hdr_total_length(wsi, methods[n]); + return n; + } + + return -1; +} + +int +lws_http_action(struct lws *wsi) +{ + struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi]; + enum http_connection_type connection_type; + enum http_version request_version; + char content_length_str[32]; + struct lws_process_html_args args; + const struct lws_http_mount *hit = NULL; + unsigned int n; + char http_version_str[10]; + char http_conn_str[20]; + int http_version_len; + char *uri_ptr = NULL, *s; + int uri_len = 0, meth; + static const char * const oprot[] = { + "http://", "https://" + }; + + meth = lws_http_get_uri_and_method(wsi, &uri_ptr, &uri_len); + if (meth < 0 || meth >= ARRAY_SIZE(method_names)) + goto bail_nuke_ah; + + /* we insist on absolute paths */ + + if (!uri_ptr || uri_ptr[0] != '/') { + lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL); + + goto bail_nuke_ah; + } + + lwsl_info("Method: '%s' (%d), request for '%s'\n", method_names[meth], + meth, uri_ptr); + + if (lws_ensure_user_space(wsi)) + goto bail_nuke_ah; + + /* HTTP header had a content length? */ + + wsi->u.http.rx_content_length = 0; + if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI) || + lws_hdr_total_length(wsi, WSI_TOKEN_PATCH_URI) || + lws_hdr_total_length(wsi, WSI_TOKEN_PUT_URI)) + wsi->u.http.rx_content_length = 100 * 1024 * 1024; + + if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) { + lws_hdr_copy(wsi, content_length_str, + sizeof(content_length_str) - 1, + WSI_TOKEN_HTTP_CONTENT_LENGTH); + wsi->u.http.rx_content_length = atoll(content_length_str); + } + + if (wsi->http2_substream) { + wsi->u.http.request_version = HTTP_VERSION_2; + } else { + /* http_version? Default to 1.0, override with token: */ + request_version = HTTP_VERSION_1_0; + + /* Works for single digit HTTP versions. : */ + http_version_len = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP); + if (http_version_len > 7) { + lws_hdr_copy(wsi, http_version_str, + sizeof(http_version_str) - 1, + WSI_TOKEN_HTTP); + if (http_version_str[5] == '1' && + http_version_str[7] == '1') + request_version = HTTP_VERSION_1_1; + } + wsi->u.http.request_version = request_version; + + /* HTTP/1.1 defaults to "keep-alive", 1.0 to "close" */ + if (request_version == HTTP_VERSION_1_1) + connection_type = HTTP_CONNECTION_KEEP_ALIVE; + else + connection_type = HTTP_CONNECTION_CLOSE; + + /* Override default if http "Connection:" header: */ + if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) { + lws_hdr_copy(wsi, http_conn_str, + sizeof(http_conn_str) - 1, + WSI_TOKEN_CONNECTION); + http_conn_str[sizeof(http_conn_str) - 1] = '\0'; + if (!strcasecmp(http_conn_str, "keep-alive")) + connection_type = HTTP_CONNECTION_KEEP_ALIVE; + else + if (!strcasecmp(http_conn_str, "close")) + connection_type = HTTP_CONNECTION_CLOSE; + } + wsi->u.http.connection_type = connection_type; + } + + n = wsi->protocol->callback(wsi, LWS_CALLBACK_FILTER_HTTP_CONNECTION, + wsi->user_space, uri_ptr, uri_len); + if (n) { + lwsl_info("LWS_CALLBACK_HTTP closing\n"); + + return 1; + } + /* + * if there is content supposed to be coming, + * put a timeout on it having arrived + */ + lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT, + wsi->context->timeout_secs); +#ifdef LWS_OPENSSL_SUPPORT + if (wsi->redirect_to_https) { + /* + * we accepted http:// only so we could redirect to + * https://, so issue the redirect. Create the redirection + * URI from the host: header and ignore the path part + */ + unsigned char *start = pt->serv_buf + LWS_PRE, *p = start, + *end = p + 512; + + if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST)) + goto bail_nuke_ah; + + n = sprintf((char *)end, "https://%s/", + lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST)); + + n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY, + end, n, &p, end); + if ((int)n < 0) + goto bail_nuke_ah; + + return lws_http_transaction_completed(wsi); + } +#endif + +#ifdef LWS_WITH_ACCESS_LOG + lws_prepare_access_log_info(wsi, uri_ptr, meth); +#endif + + /* can we serve it from the mount list? */ + + hit = lws_find_mount(wsi, uri_ptr, uri_len); + if (!hit) { + /* deferred cleanup and reset to protocols[0] */ + + lwsl_info("no hit\n"); + + if (lws_bind_protocol(wsi, &wsi->vhost->protocols[0])) + return 1; + + n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP, + wsi->user_space, uri_ptr, uri_len); + + goto after; + } + + s = uri_ptr + hit->mountpoint_len; + + /* + * if we have a mountpoint like https://xxx.com/yyy + * there is an implied / at the end for our purposes since + * we can only mount on a "directory". + * + * But if we just go with that, the browser cannot understand + * that he is actually looking down one "directory level", so + * even though we give him /yyy/abc.html he acts like the + * current directory level is /. So relative urls like "x.png" + * wrongly look outside the mountpoint. + * + * Therefore if we didn't come in on a url with an explicit + * / at the end, we must redirect to add it so the browser + * understands he is one "directory level" down. + */ + if ((hit->mountpoint_len > 1 || + (hit->origin_protocol == LWSMPRO_REDIR_HTTP || + hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) && + (*s != '/' || + (hit->origin_protocol == LWSMPRO_REDIR_HTTP || + hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) && + (hit->origin_protocol != LWSMPRO_CGI && + hit->origin_protocol != LWSMPRO_CALLBACK)) { + unsigned char *start = pt->serv_buf + LWS_PRE, + *p = start, *end = p + 512; + + lwsl_debug("Doing 301 '%s' org %s\n", s, hit->origin); + + /* > at start indicates deal with by redirect */ + if (hit->origin_protocol == LWSMPRO_REDIR_HTTP || + hit->origin_protocol == LWSMPRO_REDIR_HTTPS) + n = lws_snprintf((char *)end, 256, "%s%s", + oprot[hit->origin_protocol & 1], + hit->origin); + else { + if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST)) { + if (!lws_hdr_total_length(wsi, + WSI_TOKEN_HTTP_COLON_AUTHORITY)) + goto bail_nuke_ah; + n = lws_snprintf((char *)end, 256, + "%s%s%s/", oprot[!!lws_is_ssl(wsi)], + lws_hdr_simple_ptr(wsi, + WSI_TOKEN_HTTP_COLON_AUTHORITY), + uri_ptr); + } else + n = lws_snprintf((char *)end, 256, + "%s%s%s/", oprot[!!lws_is_ssl(wsi)], + lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST), + uri_ptr); + } + + lws_clean_url((char *)end); + n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY, + end, n, &p, end); + if ((int)n < 0) + goto bail_nuke_ah; + + return lws_http_transaction_completed(wsi); + } + +#if LWS_POSIX + /* basic auth? */ + + if (hit->basic_auth_login_file) { + char b64[160], plain[(sizeof(b64) * 3) / 4]; + int m; + + /* Did he send auth? */ + if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_AUTHORIZATION)) + return lws_unauthorised_basic_auth(wsi); + + n = HTTP_STATUS_FORBIDDEN; + + m = lws_hdr_copy(wsi, b64, sizeof(b64), + WSI_TOKEN_HTTP_AUTHORIZATION); + if (m < 7) { + lwsl_err("b64 auth too long\n"); + goto transaction_result_n; + } + + b64[5] = '\0'; + if (strcasecmp(b64, "Basic")) { + lwsl_err("auth missing basic: %s\n", b64); + goto transaction_result_n; + } + + /* It'll be like Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l */ + + m = lws_b64_decode_string(b64 + 6, plain, sizeof(plain)); + if (m < 0) { + lwsl_err("plain auth too long\n"); + goto transaction_result_n; + } + + if (!lws_find_string_in_file(hit->basic_auth_login_file, + plain, m)) { + lwsl_err("basic auth lookup failed\n"); + return lws_unauthorised_basic_auth(wsi); + } + + lwsl_notice("basic auth accepted\n"); + + /* accept the auth */ + } +#endif + +#if defined(LWS_WITH_HTTP_PROXY) + /* + * The mount is a reverse proxy? + */ + + if (hit->origin_protocol == LWSMPRO_HTTPS || + hit->origin_protocol == LWSMPRO_HTTP) { + struct lws_client_connect_info i; + char ads[96], rpath[256], *pcolon, *pslash, *p; + int n, na; + + memset(&i, 0, sizeof(i)); + i.context = lws_get_context(wsi); + + pcolon = strchr(hit->origin, ':'); + pslash = strchr(hit->origin, '/'); + if (!pslash) { + lwsl_err("Proxy mount origin '%s' must have /\n", + hit->origin); + return -1; + } + if (pcolon > pslash) + pcolon = NULL; + + if (pcolon) + n = pcolon - hit->origin; + else + n = pslash - hit->origin; + + if (n >= sizeof(ads) - 2) + n = sizeof(ads) - 2; + + memcpy(ads, hit->origin, n); + ads[n] = '\0'; + + i.address = ads; + i.port = 80; + if (hit->origin_protocol == LWSMPRO_HTTPS) { + i.port = 443; + i.ssl_connection = 1; + } + if (pcolon) + i.port = atoi(pcolon + 1); + + lws_snprintf(rpath, sizeof(rpath) - 1, "/%s/%s", pslash + 1, + uri_ptr + hit->mountpoint_len); + lws_clean_url(rpath); + na = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_URI_ARGS); + if (na) { + p = rpath + strlen(rpath); + *p++ = '?'; + lws_hdr_copy(wsi, p, &rpath[sizeof(rpath) - 1] - p, + WSI_TOKEN_HTTP_URI_ARGS); + while (--na) { + if (*p == '\0') + *p = '&'; + p++; + } + } + + + i.path = rpath; + i.host = i.address; + i.origin = NULL; + i.method = "GET"; + i.parent_wsi = wsi; + i.uri_replace_from = hit->origin; + i.uri_replace_to = hit->mountpoint; + + lwsl_notice("proxying to %s port %d url %s, ssl %d, from %s, to %s\n", + i.address, i.port, i.path, i.ssl_connection, + i.uri_replace_from, i.uri_replace_to); + + if (!lws_client_connect_via_info(&i)) { + lwsl_err("proxy connect fail\n"); + return 1; + } + + return 0; + } +#endif + + /* + * A particular protocol callback is mounted here? + * + * For the duration of this http transaction, bind us to the + * associated protocol + */ + if (hit->origin_protocol == LWSMPRO_CALLBACK || hit->protocol) { + const struct lws_protocols *pp; + const char *name = hit->origin; + if (hit->protocol) + name = hit->protocol; + + pp = lws_vhost_name_to_protocol(wsi->vhost, name); + if (!pp) { + n = -1; + lwsl_err("Unable to find plugin '%s'\n", + hit->origin); + return 1; + } + + if (lws_bind_protocol(wsi, pp)) + return 1; + + args.p = uri_ptr; + args.len = uri_len; + args.max_len = hit->auth_mask; + args.final = 0; /* used to signal callback dealt with it */ + + n = wsi->protocol->callback(wsi, LWS_CALLBACK_CHECK_ACCESS_RIGHTS, + wsi->user_space, &args, 0); + if (n) { + lws_return_http_status(wsi, HTTP_STATUS_UNAUTHORIZED, + NULL); + goto bail_nuke_ah; + } + if (args.final) /* callback completely handled it well */ + return 0; + + if (hit->cgienv && wsi->protocol->callback(wsi, + LWS_CALLBACK_HTTP_PMO, + wsi->user_space, (void *)hit->cgienv, 0)) + return 1; + + if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI)) { + n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP, + wsi->user_space, + uri_ptr + hit->mountpoint_len, + uri_len - hit->mountpoint_len); + goto after; + } + } + +#ifdef LWS_WITH_CGI + /* did we hit something with a cgi:// origin? */ + if (hit->origin_protocol == LWSMPRO_CGI) { + const char *cmd[] = { + NULL, /* replace with cgi path */ + NULL + }; + + lwsl_debug("%s: cgi\n", __func__); + cmd[0] = hit->origin; + + n = 5; + if (hit->cgi_timeout) + n = hit->cgi_timeout; + + n = lws_cgi(wsi, cmd, hit->mountpoint_len, n, + hit->cgienv); + if (n) { + lwsl_err("%s: cgi failed\n", __func__); + return -1; + } + + goto deal_body; + } +#endif + + n = strlen(s); + if (s[0] == '\0' || (n == 1 && s[n - 1] == '/')) + s = (char *)hit->def; + if (!s) + s = "index.html"; + + wsi->cache_secs = hit->cache_max_age; + wsi->cache_reuse = hit->cache_reusable; + wsi->cache_revalidate = hit->cache_revalidate; + wsi->cache_intermediaries = hit->cache_intermediaries; + + n = lws_http_serve(wsi, s, hit->origin, hit); + if (n) { + /* + * lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL); + */ + if (hit->protocol) { + const struct lws_protocols *pp = lws_vhost_name_to_protocol( + wsi->vhost, hit->protocol); + + if (lws_bind_protocol(wsi, pp)) + return 1; + + n = pp->callback(wsi, LWS_CALLBACK_HTTP, + wsi->user_space, + uri_ptr + hit->mountpoint_len, + uri_len - hit->mountpoint_len); + } else + n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP, + wsi->user_space, uri_ptr, uri_len); + } + +after: + if (n) { + lwsl_info("LWS_CALLBACK_HTTP closing\n"); + + return 1; + } + +#ifdef LWS_WITH_CGI +deal_body: +#endif + /* + * If we're not issuing a file, check for content_length or + * HTTP keep-alive. No keep-alive header allocation for + * ISSUING_FILE, as this uses HTTP/1.0. + * + * In any case, return 0 and let lws_read decide how to + * proceed based on state + */ + if (wsi->state != LWSS_HTTP_ISSUING_FILE) { + /* Prepare to read body if we have a content length: */ + lwsl_debug("wsi->u.http.rx_content_length %lld %d %d\n", + (long long)wsi->u.http.rx_content_length, + wsi->upgraded_to_http2, wsi->http2_substream); + if (wsi->u.http.rx_content_length > 0) { + lwsl_notice("%s: %p: LWSS_HTTP_BODY state set\n", + __func__, wsi); + wsi->state = LWSS_HTTP_BODY; + wsi->u.http.rx_content_remain = + wsi->u.http.rx_content_length; + } + } + + return 0; + +bail_nuke_ah: + /* we're closing, losing some rx is OK */ + lws_header_table_force_to_detachable_state(wsi); + lws_header_table_detach(wsi, 1); + + return 1; + +#if LWS_POSIX +transaction_result_n: + lws_return_http_status(wsi, n, NULL); + + return lws_http_transaction_completed(wsi); +#endif +} + +static int +lws_server_init_wsi_for_ws(struct lws *wsi) +{ + int n; + + wsi->state = LWSS_ESTABLISHED; + lws_restart_ws_ping_pong_timer(wsi); + + /* + * create the frame buffer for this connection according to the + * size mentioned in the protocol definition. If 0 there, use + * a big default for compatibility + */ + + n = wsi->protocol->rx_buffer_size; + if (!n) + n = wsi->context->pt_serv_buf_size; + n += LWS_PRE; + wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */, "rx_ubuf"); + if (!wsi->u.ws.rx_ubuf) { + lwsl_err("Out of Mem allocating rx buffer %d\n", n); + return 1; + } + wsi->u.ws.rx_ubuf_alloc = n; + lwsl_debug("Allocating RX buffer %d\n", n); + +#if LWS_POSIX && !defined(LWS_WITH_ESP32) + if (!wsi->parent_carries_io) + if (setsockopt(wsi->desc.sockfd, SOL_SOCKET, SO_SNDBUF, + (const char *)&n, sizeof n)) { + lwsl_warn("Failed to set SNDBUF to %d", n); + return 1; + } +#endif + + /* notify user code that we're ready to roll */ + + if (wsi->protocol->callback) + if (wsi->protocol->callback(wsi, LWS_CALLBACK_ESTABLISHED, + wsi->user_space, +#ifdef LWS_OPENSSL_SUPPORT + wsi->ssl, +#else + NULL, +#endif + 0)) + return 1; + + return 0; +} + +int +lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len) +{ + int protocol_len, n = 0, hit, non_space_char_found = 0, m; + struct lws_context *context = lws_get_context(wsi); + struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi]; + struct _lws_header_related hdr; + struct allocated_headers *ah; + unsigned char *obuf = *buf; + char protocol_list[128]; + char protocol_name[64]; + size_t olen = len; + char *p; + + if (len >= 10000000) { + lwsl_err("%s: assert: len %ld\n", __func__, (long)len); + assert(0); + } + + if (!wsi->u.hdr.ah) { + lwsl_err("%s: assert: NULL ah\n", __func__); + assert(0); + } + + lwsl_hexdump(*buf, len); + + while (len--) { + wsi->more_rx_waiting = !!len; + + if (wsi->mode != LWSCM_HTTP_SERVING && + wsi->mode != LWSCM_HTTP2_SERVING && + wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED) { + lwsl_err("%s: bad wsi mode %d\n", __func__, wsi->mode); + goto bail_nuke_ah; + } + + m = lws_parse(wsi, *(*buf)++); + if (m) { + if (m == 2) { + /* + * we are transitioning from http with + * an AH, to raw. Drop the ah and set + * the mode. + */ +raw_transition: + lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); + lws_bind_protocol(wsi, &wsi->vhost->protocols[ + wsi->vhost-> + raw_protocol_index]); + lwsl_info("transition to raw vh %s prot %d\n", + wsi->vhost->name, + wsi->vhost->raw_protocol_index); + if ((wsi->protocol->callback)(wsi, + LWS_CALLBACK_RAW_ADOPT, + wsi->user_space, NULL, 0)) + goto bail_nuke_ah; + + lws_header_table_force_to_detachable_state(wsi); + lws_union_transition(wsi, LWSCM_RAW); + lws_header_table_detach(wsi, 1); + + if (m == 2 && (wsi->protocol->callback)(wsi, + LWS_CALLBACK_RAW_RX, + wsi->user_space, obuf, olen)) + return 1; + + return 0; + } + lwsl_info("lws_parse failed\n"); + goto bail_nuke_ah; + } + + if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE) + continue; + + lwsl_parser("%s: lws_parse sees parsing complete\n", __func__); + lwsl_debug("%s: wsi->more_rx_waiting=%d\n", __func__, + wsi->more_rx_waiting); + + /* select vhost */ + + if (lws_hdr_total_length(wsi, WSI_TOKEN_HOST)) { + struct lws_vhost *vhost = lws_select_vhost( + context, wsi->vhost->listen_port, + lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST)); + + if (vhost) + wsi->vhost = vhost; + } else + lwsl_info("no host\n"); + + if (wsi->mode != LWSCM_HTTP2_SERVING) { + wsi->vhost->conn_stats.h1_trans++; + if (!wsi->conn_stat_done) { + wsi->vhost->conn_stats.h1_conn++; + wsi->conn_stat_done = 1; + } + } + + /* check for unwelcome guests */ + + if (wsi->context->reject_service_keywords) { + const struct lws_protocol_vhost_options *rej = + wsi->context->reject_service_keywords; + char ua[384], *msg = NULL; + + if (lws_hdr_copy(wsi, ua, sizeof(ua) - 1, + WSI_TOKEN_HTTP_USER_AGENT) > 0) { + ua[sizeof(ua) - 1] = '\0'; + while (rej) { + if (strstr(ua, rej->name)) { +#ifdef LWS_WITH_ACCESS_LOG + char *uri_ptr = NULL; + int meth, uri_len; +#endif + + msg = strchr(rej->value, ' '); + if (msg) + msg++; + lws_return_http_status(wsi, + atoi(rej->value), msg); +#ifdef LWS_WITH_ACCESS_LOG + meth = lws_http_get_uri_and_method(wsi, + &uri_ptr, &uri_len); + if (meth >= 0) + lws_prepare_access_log_info(wsi, + uri_ptr, meth); + + /* wsi close will do the log */ +#endif + wsi->vhost->conn_stats.rejected++; + /* + * We don't want anything from + * this rejected guy. Follow + * the close flow, not the + * transaction complete flow. + */ + goto bail_nuke_ah; + } + rej = rej->next; + } + } + } + + + if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECT)) { + lwsl_info("Changing to RAW mode\n"); + m = 0; + goto raw_transition; + } + + wsi->mode = LWSCM_PRE_WS_SERVING_ACCEPT; + lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); + + /* is this websocket protocol or normal http 1.0? */ + + if (lws_hdr_total_length(wsi, WSI_TOKEN_UPGRADE)) { + if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE), + "websocket")) { + wsi->vhost->conn_stats.ws_upg++; + lwsl_info("Upgrade to ws\n"); + goto upgrade_ws; + } +#ifdef LWS_WITH_HTTP2 + if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE), + "h2c")) { + wsi->vhost->conn_stats.h2_upg++; + lwsl_info("Upgrade to h2c\n"); + goto upgrade_h2c; + } +#endif + lwsl_info("Unknown upgrade\n"); + /* dunno what he wanted to upgrade to */ + goto bail_nuke_ah; + } + + /* no upgrade ack... he remained as HTTP */ + + lwsl_info("No upgrade\n"); + ah = wsi->u.hdr.ah; + + lws_union_transition(wsi, LWSCM_HTTP_SERVING_ACCEPTED); + wsi->state = LWSS_HTTP; + wsi->u.http.fop_fd = NULL; + + /* expose it at the same offset as u.hdr */ + wsi->u.http.ah = ah; + lwsl_debug("%s: wsi %p: ah %p\n", __func__, (void *)wsi, + (void *)wsi->u.hdr.ah); + + n = lws_http_action(wsi); + + return n; + +#ifdef LWS_WITH_HTTP2 +upgrade_h2c: + if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) { + lwsl_info("missing http2_settings\n"); + goto bail_nuke_ah; + } + + lwsl_info("h2c upgrade...\n"); + + p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP2_SETTINGS); + /* convert the peer's HTTP-Settings */ + n = lws_b64_decode_string(p, protocol_list, + sizeof(protocol_list)); + if (n < 0) { + lwsl_parser("HTTP2_SETTINGS too long\n"); + return 1; + } + + /* adopt the header info */ + + ah = wsi->u.hdr.ah; + + lws_union_transition(wsi, LWSCM_HTTP2_SERVING); + + /* http2 union member has http union struct at start */ + wsi->u.http.ah = ah; + + if (!wsi->u.h2.h2n) { + wsi->u.h2.h2n = lws_zalloc(sizeof(*wsi->u.h2.h2n), "h2n"); + if (!wsi->u.h2.h2n) + return 1; + } + + lws_h2_init(wsi); + + /* HTTP2 union */ + + lws_h2_settings(wsi, &wsi->u.h2.h2n->set, + (unsigned char *)protocol_list, n); + + lws_hpack_dynamic_size(wsi, wsi->u.h2.h2n->set.s[ + H2SET_HEADER_TABLE_SIZE]); + + strcpy(protocol_list, "HTTP/1.1 101 Switching Protocols\x0d\x0a" + "Connection: Upgrade\x0d\x0a" + "Upgrade: h2c\x0d\x0a\x0d\x0a"); + n = lws_issue_raw(wsi, (unsigned char *)protocol_list, + strlen(protocol_list)); + if (n != strlen(protocol_list)) { + lwsl_debug("http2 switch: ERROR writing to socket\n"); + return 1; + } + + wsi->state = LWSS_HTTP2_AWAIT_CLIENT_PREFACE; + + return 0; +#endif + +upgrade_ws: + if (!wsi->protocol) + lwsl_err("NULL protocol at lws_read\n"); + + /* + * It's websocket + * + * Select the first protocol we support from the list + * the client sent us. + * + * Copy it to remove header fragmentation + */ + + if (lws_hdr_copy(wsi, protocol_list, sizeof(protocol_list) - 1, + WSI_TOKEN_PROTOCOL) < 0) { + lwsl_err("protocol list too long"); + goto bail_nuke_ah; + } + + protocol_len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL); + protocol_list[protocol_len] = '\0'; + p = protocol_list; + hit = 0; + + while (*p && !hit) { + n = 0; + non_space_char_found = 0; + while (n < sizeof(protocol_name) - 1 && + *p && *p != ',') { + /* ignore leading spaces */ + if (!non_space_char_found && *p == ' ') { + n++; + continue; + } + non_space_char_found = 1; + protocol_name[n++] = *p++; + } + protocol_name[n] = '\0'; + if (*p) + p++; + + lwsl_info("checking %s\n", protocol_name); + + n = 0; + while (wsi->vhost->protocols[n].callback) { + lwsl_info("try %s\n", + wsi->vhost->protocols[n].name); + + if (wsi->vhost->protocols[n].name && + !strcmp(wsi->vhost->protocols[n].name, + protocol_name)) { + wsi->protocol = &wsi->vhost->protocols[n]; + hit = 1; + break; + } + + n++; + } + } + + /* we didn't find a protocol he wanted? */ + + if (!hit) { + if (lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL)) { + lwsl_info("No protocol from \"%s\" supported\n", + protocol_list); + goto bail_nuke_ah; + } + /* + * some clients only have one protocol and + * do not send the protocol list header... + * allow it and match to the vhost's default + * protocol (which itself defaults to zero) + */ + lwsl_info("defaulting to prot handler %d\n", + wsi->vhost->default_protocol_index); + n = wsi->vhost->default_protocol_index; + wsi->protocol = &wsi->vhost->protocols[ + (int)wsi->vhost->default_protocol_index]; + } + + /* allocate wsi->user storage */ + if (lws_ensure_user_space(wsi)) + goto bail_nuke_ah; + + /* + * Give the user code a chance to study the request and + * have the opportunity to deny it + */ + if ((wsi->protocol->callback)(wsi, + LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION, + wsi->user_space, + lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL), 0)) { + lwsl_warn("User code denied connection\n"); + goto bail_nuke_ah; + } + + /* + * Perform the handshake according to the protocol version the + * client announced + */ + + switch (wsi->ietf_spec_revision) { + case 13: + lwsl_parser("lws_parse calling handshake_04\n"); + if (handshake_0405(context, wsi)) { + lwsl_info("hs0405 has failed the connection\n"); + goto bail_nuke_ah; + } + break; + + default: + lwsl_info("Unknown client spec version %d\n", + wsi->ietf_spec_revision); + goto bail_nuke_ah; + } + + lws_same_vh_protocol_insert(wsi, n); + + /* we are upgrading to ws, so http/1.1 and keepalive + + * pipelined header considerations about keeping the ah around + * no longer apply. However it's common for the first ws + * protocol data to have been coalesced with the browser + * upgrade request and to already be in the ah rx buffer. + */ + + lwsl_info("%s: %p: inheriting ws ah (rxpos:%d, rxlen:%d)\n", + __func__, wsi, wsi->u.hdr.ah->rxpos, + wsi->u.hdr.ah->rxlen); + lws_pt_lock(pt); + hdr = wsi->u.hdr; + + lws_union_transition(wsi, LWSCM_WS_SERVING); + /* + * first service is WS mode will notice this, use the RX and + * then detach the ah (caution: we are not in u.hdr union + * mode any more then... ah_temp member is at start the same + * though) + * + * Because rxpos/rxlen shows something in the ah, we will get + * service guaranteed next time around the event loop + * + * All union members begin with hdr, so we can use it even + * though we transitioned to ws union mode (the ah detach + * code uses it anyway). + */ + wsi->u.hdr = hdr; + lws_pt_unlock(pt); + + lws_server_init_wsi_for_ws(wsi); + lwsl_parser("accepted v%02d connection\n", + wsi->ietf_spec_revision); + + /* !!! drop ah unreservedly after ESTABLISHED */ + if (!wsi->more_rx_waiting) { + lws_header_table_force_to_detachable_state(wsi); + lws_header_table_detach(wsi, 1); + } + + return 0; + } /* while all chars are handled */ + + return 0; + +bail_nuke_ah: + /* drop the header info */ + /* we're closing, losing some rx is OK */ + lws_header_table_force_to_detachable_state(wsi); + lws_header_table_detach(wsi, 1); + + return 1; +} + + +static int +lws_get_idlest_tsi(struct lws_context *context) +{ + unsigned int lowest = ~0; + int n = 0, hit = -1; + + for (; n < context->count_threads; n++) { + if ((unsigned int)context->pt[n].fds_count != + context->fd_limit_per_thread - 1 && + (unsigned int)context->pt[n].fds_count < lowest) { + lowest = context->pt[n].fds_count; + hit = n; + } + } + + return hit; +} + +struct lws * +lws_create_new_server_wsi(struct lws_vhost *vhost) +{ + struct lws *new_wsi; + int n = lws_get_idlest_tsi(vhost->context); + + if (n < 0) { + lwsl_err("no space for new conn\n"); + return NULL; + } + + new_wsi = lws_zalloc(sizeof(struct lws), "new server wsi"); + if (new_wsi == NULL) { + lwsl_err("Out of memory for new connection\n"); + return NULL; + } + + new_wsi->tsi = n; + lwsl_debug("new wsi %p joining vhost %s, tsi %d\n", new_wsi, + vhost->name, new_wsi->tsi); + + new_wsi->vhost = vhost; + new_wsi->context = vhost->context; + new_wsi->pending_timeout = NO_PENDING_TIMEOUT; + new_wsi->rxflow_change_to = LWS_RXFLOW_ALLOW; + + /* initialize the instance struct */ + + new_wsi->state = LWSS_HTTP; + new_wsi->mode = LWSCM_HTTP_SERVING; + new_wsi->hdr_parsing_completed = 0; + +#ifdef LWS_OPENSSL_SUPPORT + new_wsi->use_ssl = LWS_SSL_ENABLED(vhost); +#endif + + /* + * these can only be set once the protocol is known + * we set an un-established connection's protocol pointer + * to the start of the supported list, so it can look + * for matching ones during the handshake + */ + new_wsi->protocol = vhost->protocols; + new_wsi->user_space = NULL; + new_wsi->ietf_spec_revision = 0; + new_wsi->desc.sockfd = LWS_SOCK_INVALID; + new_wsi->position_in_fds_table = -1; + + vhost->context->count_wsi_allocated++; + + /* + * outermost create notification for wsi + * no user_space because no protocol selection + */ + vhost->protocols[0].callback(new_wsi, LWS_CALLBACK_WSI_CREATE, + NULL, NULL, 0); + + return new_wsi; +} + +LWS_VISIBLE int LWS_WARN_UNUSED_RESULT +lws_http_transaction_completed(struct lws *wsi) +{ + int n = NO_PENDING_TIMEOUT; + + lwsl_info("%s: wsi %p\n", __func__, wsi); + + lws_access_log(wsi); + + if (!wsi->hdr_parsing_completed) { + lwsl_notice("%s: ignoring, ah parsing incomplete\n", __func__); + return 0; + } + + lwsl_debug("%s: wsi %p\n", __func__, wsi); + /* if we can't go back to accept new headers, drop the connection */ + if (wsi->http2_substream) + return 0; + + if (wsi->seen_zero_length_recv) + return 1; + + if (wsi->u.http.connection_type != HTTP_CONNECTION_KEEP_ALIVE) { + lwsl_info("%s: %p: close connection\n", __func__, wsi); + return 1; + } + + if (lws_bind_protocol(wsi, &wsi->vhost->protocols[0])) + return 1; + + /* otherwise set ourselves up ready to go again */ + wsi->state = LWSS_HTTP; + wsi->mode = LWSCM_HTTP_SERVING; + wsi->u.http.tx_content_length = 0; + wsi->u.http.tx_content_remain = 0; + wsi->hdr_parsing_completed = 0; +#ifdef LWS_WITH_ACCESS_LOG + wsi->access_log.sent = 0; +#endif + + if (wsi->vhost->keepalive_timeout) + n = PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE; + lws_set_timeout(wsi, n, wsi->vhost->keepalive_timeout); + + /* + * We already know we are on http1.1 / keepalive and the next thing + * coming will be another header set. + * + * If there is no pending rx and we still have the ah, drop it and + * reacquire a new ah when the new headers start to arrive. (Otherwise + * we needlessly hog an ah indefinitely.) + * + * However if there is pending rx and we know from the keepalive state + * that is already at least the start of another header set, simply + * reset the existing header table and keep it. + */ + if (wsi->u.hdr.ah) { + lwsl_debug("%s: wsi->more_rx_waiting=%d\n", __func__, + wsi->more_rx_waiting); + + if (!wsi->more_rx_waiting) { + lws_header_table_force_to_detachable_state(wsi); + lws_header_table_detach(wsi, 1); +#ifdef LWS_OPENSSL_SUPPORT + /* + * additionally... if we are hogging an SSL instance + * with no pending pipelined headers (or ah now), and + * SSL is scarce, drop this connection without waiting + */ + + if (wsi->vhost->use_ssl && + wsi->context->simultaneous_ssl_restriction && + wsi->context->simultaneous_ssl == + wsi->context->simultaneous_ssl_restriction) { + lwsl_info("%s: simultaneous_ssl_restriction\n", + __func__); + return 1; + } +#endif + } else { + lws_header_table_reset(wsi, 1); + /* + * If we kept the ah, we should restrict the amount + * of time we are willing to keep it. Otherwise it + * will be bound the whole time the connection remains + * open. + */ + lws_set_timeout(wsi, PENDING_TIMEOUT_HOLDING_AH, + wsi->vhost->keepalive_timeout); + } + } + + /* If we're (re)starting on headers, need other implied init */ + wsi->u.hdr.ues = URIES_IDLE; + + lwsl_info("%s: %p: keep-alive await new transaction\n", __func__, wsi); + + return 0; +} + +/* if not a socket, it's a raw, non-ssl file descriptor */ + +LWS_VISIBLE struct lws * +lws_adopt_descriptor_vhost(struct lws_vhost *vh, lws_adoption_type type, + lws_sock_file_fd_type fd, const char *vh_prot_name, + struct lws *parent) +{ + struct lws_context *context = vh->context; + struct lws *new_wsi; + struct lws_context_per_thread *pt; + int n, ssl = 0; + +#if defined(LWS_WITH_PEER_LIMITS) + struct lws_peer *peer = NULL; + + if (type & LWS_ADOPT_SOCKET && !(type & LWS_ADOPT_WS_PARENTIO)) { + peer = lws_get_or_create_peer(vh, fd.sockfd); + + if (!peer) { + lwsl_err("OOM creating peer\n"); + return NULL; + } + if (context->ip_limit_wsi && + peer->count_wsi >= context->ip_limit_wsi) { + lwsl_notice("Peer reached wsi limit %d\n", + context->ip_limit_wsi); + lws_stats_atomic_bump(context, &context->pt[0], + LWSSTATS_C_PEER_LIMIT_WSI_DENIED, 1); + return NULL; + } + } +#endif + + new_wsi = lws_create_new_server_wsi(vh); + if (!new_wsi) { + if (type & LWS_ADOPT_SOCKET && !(type & LWS_ADOPT_WS_PARENTIO)) + compatible_close(fd.sockfd); + return NULL; + } +#if defined(LWS_WITH_PEER_LIMITS) + if (peer) + lws_peer_add_wsi(context, peer, new_wsi); +#endif + pt = &context->pt[(int)new_wsi->tsi]; + lws_stats_atomic_bump(context, pt, LWSSTATS_C_CONNECTIONS, 1); + + if (parent) { + new_wsi->parent = parent; + new_wsi->sibling_list = parent->child_list; + parent->child_list = new_wsi; + + if (type & LWS_ADOPT_WS_PARENTIO) + new_wsi->parent_carries_io = 1; + } + + new_wsi->desc = fd; + + if (vh_prot_name) { + new_wsi->protocol = lws_vhost_name_to_protocol(new_wsi->vhost, + vh_prot_name); + if (!new_wsi->protocol) { + lwsl_err("Protocol %s not enabled on vhost %s\n", + vh_prot_name, new_wsi->vhost->name); + goto bail; + } + if (lws_ensure_user_space(new_wsi)) { + lwsl_notice("OOM trying to get user_space\n"); + goto bail; + } + if (type & LWS_ADOPT_WS_PARENTIO) { + new_wsi->desc.sockfd = LWS_SOCK_INVALID; + lwsl_debug("binding to %s\n", new_wsi->protocol->name); + lws_bind_protocol(new_wsi, new_wsi->protocol); + lws_union_transition(new_wsi, LWSCM_WS_SERVING); + lws_server_init_wsi_for_ws(new_wsi); + + return new_wsi; + } + } else + if (type & LWS_ADOPT_HTTP) /* he will transition later */ + new_wsi->protocol = + &vh->protocols[vh->default_protocol_index]; + else { /* this is the only time he will transition */ + lws_bind_protocol(new_wsi, + &vh->protocols[vh->raw_protocol_index]); + lws_union_transition(new_wsi, LWSCM_RAW); + } + + if (type & LWS_ADOPT_SOCKET) { /* socket desc */ + lwsl_debug("%s: new wsi %p, sockfd %d\n", __func__, new_wsi, + (int)(lws_intptr_t)fd.sockfd); + + if (type & LWS_ADOPT_HTTP) + /* the transport is accepted... + * give him time to negotiate */ + lws_set_timeout(new_wsi, + PENDING_TIMEOUT_ESTABLISH_WITH_SERVER, + context->timeout_secs); + +#if LWS_POSIX == 0 +#if defined(LWS_WITH_ESP8266) + esp8266_tcp_stream_accept(accept_fd, new_wsi); +#endif +#endif + } else /* file desc */ + lwsl_debug("%s: new wsi %p, filefd %d\n", __func__, new_wsi, + (int)(lws_intptr_t)fd.filefd); + + /* + * A new connection was accepted. Give the user a chance to + * set properties of the newly created wsi. There's no protocol + * selected yet so we issue this to the vhosts's default protocol, + * itself by default protocols[0] + */ + n = LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED; + if (!(type & LWS_ADOPT_HTTP)) { + if (!(type & LWS_ADOPT_SOCKET)) + n = LWS_CALLBACK_RAW_ADOPT_FILE; + else + n = LWS_CALLBACK_RAW_ADOPT; + } + + if (!LWS_SSL_ENABLED(new_wsi->vhost) || !(type & LWS_ADOPT_ALLOW_SSL) || + !(type & LWS_ADOPT_SOCKET)) { + /* non-SSL */ + if (!(type & LWS_ADOPT_HTTP)) { + if (!(type & LWS_ADOPT_SOCKET)) + new_wsi->mode = LWSCM_RAW_FILEDESC; + else + new_wsi->mode = LWSCM_RAW; + } + } else { + /* SSL */ + if (!(type & LWS_ADOPT_HTTP)) + new_wsi->mode = LWSCM_SSL_INIT_RAW; + else + new_wsi->mode = LWSCM_SSL_INIT; + + ssl = 1; + } + + lws_libev_accept(new_wsi, new_wsi->desc); + lws_libuv_accept(new_wsi, new_wsi->desc); + lws_libevent_accept(new_wsi, new_wsi->desc); + + if (!ssl) { + if (insert_wsi_socket_into_fds(context, new_wsi)) { + lwsl_err("%s: fail inserting socket\n", __func__); + goto fail; + } + } else + if (lws_server_socket_service_ssl(new_wsi, fd.sockfd)) { + lwsl_info("%s: fail ssl negotiation\n", __func__); + goto fail; + } + + /* + * by deferring callback to this point, after insertion to fds, + * lws_callback_on_writable() can work from the callback + */ + if ((new_wsi->protocol->callback)( + new_wsi, n, new_wsi->user_space, NULL, 0)) + goto fail; + + if (type & LWS_ADOPT_HTTP) { + if (!lws_header_table_attach(new_wsi, 0)) + lwsl_debug("Attached ah immediately\n"); + else + lwsl_info("%s: waiting for ah\n", __func__); + } + + return new_wsi; + +fail: + if (type & LWS_ADOPT_SOCKET) + lws_close_free_wsi(new_wsi, LWS_CLOSE_STATUS_NOSTATUS); + + return NULL; + +bail: + lwsl_notice("%s: exiting on bail\n", __func__); + if (parent) + parent->child_list = new_wsi->sibling_list; + if (new_wsi->user_space) + lws_free(new_wsi->user_space); + lws_free(new_wsi); + compatible_close(fd.sockfd); + + return NULL; +} + +LWS_VISIBLE struct lws * +lws_adopt_socket_vhost(struct lws_vhost *vh, lws_sockfd_type accept_fd) +{ + lws_sock_file_fd_type fd; + + fd.sockfd = accept_fd; + return lws_adopt_descriptor_vhost(vh, LWS_ADOPT_SOCKET | + LWS_ADOPT_HTTP | LWS_ADOPT_ALLOW_SSL, fd, NULL, NULL); +} + +LWS_VISIBLE struct lws * +lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd) +{ + return lws_adopt_socket_vhost(context->vhost_list, accept_fd); +} + +/* Common read-buffer adoption for lws_adopt_*_readbuf */ +static struct lws* +adopt_socket_readbuf(struct lws *wsi, const char *readbuf, size_t len) +{ + struct lws_context_per_thread *pt; + struct allocated_headers *ah; + struct lws_pollfd *pfd; + + if (!wsi) + return NULL; + + if (!readbuf || len == 0) + return wsi; + + if (len > sizeof(ah->rx)) { + lwsl_err("%s: rx in too big\n", __func__); + goto bail; + } + + /* + * we can't process the initial read data until we can attach an ah. + * + * if one is available, get it and place the data in his ah rxbuf... + * wsi with ah that have pending rxbuf get auto-POLLIN service. + * + * no autoservice because we didn't get a chance to attach the + * readbuf data to wsi or ah yet, and we will do it next if we get + * the ah. + */ + if (wsi->u.hdr.ah || !lws_header_table_attach(wsi, 0)) { + ah = wsi->u.hdr.ah; + memcpy(ah->rx, readbuf, len); + ah->rxpos = 0; + ah->rxlen = (int16_t)len; + + lwsl_notice("%s: calling service on readbuf ah\n", __func__); + pt = &wsi->context->pt[(int)wsi->tsi]; + + /* unlike a normal connect, we have the headers already + * (or the first part of them anyway). + * libuv won't come back and service us without a network + * event, so we need to do the header service right here. + */ + pfd = &pt->fds[wsi->position_in_fds_table]; + pfd->revents |= LWS_POLLIN; + lwsl_err("%s: calling service\n", __func__); + if (lws_service_fd_tsi(wsi->context, pfd, wsi->tsi)) + /* service closed us */ + return NULL; + + return wsi; + } + lwsl_err("%s: deferring handling ah\n", __func__); + /* + * hum if no ah came, we are on the wait list and must defer + * dealing with this until the ah arrives. + * + * later successful lws_header_table_attach() will apply the + * below to the rx buffer (via lws_header_table_reset()). + */ + wsi->u.hdr.preamble_rx = lws_malloc(len, "preamble_rx"); + if (!wsi->u.hdr.preamble_rx) { + lwsl_err("OOM\n"); + goto bail; + } + memcpy(wsi->u.hdr.preamble_rx, readbuf, len); + wsi->u.hdr.preamble_rx_len = len; + + return wsi; + +bail: + lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS); + + return NULL; +} + +LWS_VISIBLE struct lws * +lws_adopt_socket_readbuf(struct lws_context *context, lws_sockfd_type accept_fd, + const char *readbuf, size_t len) +{ + return adopt_socket_readbuf(lws_adopt_socket(context, accept_fd), + readbuf, len); +} + +LWS_VISIBLE struct lws * +lws_adopt_socket_vhost_readbuf(struct lws_vhost *vhost, + lws_sockfd_type accept_fd, + const char *readbuf, size_t len) +{ + return adopt_socket_readbuf(lws_adopt_socket_vhost(vhost, accept_fd), + readbuf, len); +} + +LWS_VISIBLE int +lws_server_socket_service(struct lws_context *context, struct lws *wsi, + struct lws_pollfd *pollfd) +{ + struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi]; + lws_sockfd_type accept_fd = LWS_SOCK_INVALID; + struct allocated_headers *ah; + lws_sock_file_fd_type fd; + int opts = LWS_ADOPT_SOCKET | LWS_ADOPT_ALLOW_SSL; +#if LWS_POSIX + struct sockaddr_storage cli_addr; + socklen_t clilen; +#endif + int n, len; + + switch (wsi->mode) { + + case LWSCM_HTTP_SERVING: + case LWSCM_HTTP_SERVING_ACCEPTED: + case LWSCM_HTTP2_SERVING: + case LWSCM_RAW: + + /* handle http headers coming in */ + + /* pending truncated sends have uber priority */ + + if (wsi->trunc_len) { + if (!(pollfd->revents & LWS_POLLOUT)) + break; + + if (lws_issue_raw(wsi, wsi->trunc_alloc + + wsi->trunc_offset, + wsi->trunc_len) < 0) + goto fail; + /* + * we can't afford to allow input processing to send + * something new, so spin around he event loop until + * he doesn't have any partials + */ + break; + } + + /* any incoming data ready? */ + + if (!(pollfd->revents & pollfd->events & LWS_POLLIN)) + goto try_pollout; + + /* + * If we previously just did POLLIN when IN and OUT were + * signalled (because POLLIN processing may have used up + * the POLLOUT), don't let that happen twice in a row... + * next time we see the situation favour POLLOUT + */ +#if !defined(LWS_WITH_ESP8266) + if (wsi->favoured_pollin && + (pollfd->revents & pollfd->events & LWS_POLLOUT)) { + lwsl_notice("favouring pollout\n"); + wsi->favoured_pollin = 0; + goto try_pollout; + } +#endif + + /* these states imply we MUST have an ah attached */ + + if (wsi->mode != LWSCM_RAW && (wsi->state == LWSS_HTTP || + wsi->state == LWSS_HTTP_ISSUING_FILE || + wsi->state == LWSS_HTTP_HEADERS)) { + if (!wsi->u.hdr.ah) { + /* no autoservice beacuse we will do it next */ + if (lws_header_table_attach(wsi, 0)) { + lwsl_info("wsi %p: ah get fail\n", wsi); + goto try_pollout; + } + } + ah = wsi->u.hdr.ah; + + /* if nothing in ah rx buffer, get some fresh rx */ + if (ah->rxpos == ah->rxlen) { + ah->rxlen = lws_ssl_capable_read(wsi, ah->rx, + sizeof(ah->rx)); + ah->rxpos = 0; + switch (ah->rxlen) { + case 0: + lwsl_info("%s: read 0 len a\n", __func__); + wsi->seen_zero_length_recv = 1; + lws_change_pollfd(wsi, LWS_POLLIN, 0); + goto try_pollout; + /* fallthru */ + case LWS_SSL_CAPABLE_ERROR: + goto fail; + case LWS_SSL_CAPABLE_MORE_SERVICE: + ah->rxlen = ah->rxpos = 0; + goto try_pollout; + } + + /* + * make sure ah does not get detached if we + * have live data in the rx + */ + if (ah->rxlen) + wsi->more_rx_waiting = 1; + } + + if (!(ah->rxpos != ah->rxlen && ah->rxlen)) { + lwsl_err("%s: assert: rxpos %d, rxlen %d\n", + __func__, ah->rxpos, ah->rxlen); + + assert(0); + } + + /* just ignore incoming if waiting for close */ + if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE && + wsi->state != LWSS_HTTP_ISSUING_FILE) { + /* + * otherwise give it to whoever wants it + * according to the connection state + */ + + n = lws_read(wsi, ah->rx + ah->rxpos, + ah->rxlen - ah->rxpos); + if (n < 0) /* we closed wsi */ + return 1; + + if (!wsi->u.hdr.ah) + break; + if ( wsi->u.hdr.ah->rxlen) + wsi->u.hdr.ah->rxpos += n; + + lwsl_debug("%s: wsi %p: ah read rxpos %d, rxlen %d\n", + __func__, wsi, wsi->u.hdr.ah->rxpos, + wsi->u.hdr.ah->rxlen); + + if (lws_header_table_is_in_detachable_state(wsi) && + (wsi->mode != LWSCM_HTTP_SERVING && + wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED && + wsi->mode != LWSCM_HTTP2_SERVING)) + lws_header_table_detach(wsi, 1); + + break; + } + + goto try_pollout; + } + + len = lws_ssl_capable_read(wsi, pt->serv_buf, + context->pt_serv_buf_size); + lwsl_debug("%s: wsi %p read %d\r\n", __func__, wsi, len); + switch (len) { + case 0: + lwsl_info("%s: read 0 len b\n", __func__); + + /* fallthru */ + case LWS_SSL_CAPABLE_ERROR: + goto fail; + case LWS_SSL_CAPABLE_MORE_SERVICE: + goto try_pollout; + } + + if (len < 0) /* coverity */ + goto fail; + + if (wsi->mode == LWSCM_RAW) { + n = user_callback_handle_rxflow(wsi->protocol->callback, + wsi, LWS_CALLBACK_RAW_RX, + wsi->user_space, pt->serv_buf, len); + if (n < 0) { + lwsl_info("LWS_CALLBACK_RAW_RX_fail\n"); + goto fail; + } + goto try_pollout; + } + + /* just ignore incoming if waiting for close */ + if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE && + wsi->state != LWSS_HTTP_ISSUING_FILE) { + /* + * this may want to send + * (via HTTP callback for example) + */ + n = lws_read(wsi, pt->serv_buf, len); + if (n < 0) /* we closed wsi */ + return 1; + /* + * he may have used up the + * writability above, if we will defer POLLOUT + * processing in favour of POLLIN, note it + */ + if (pollfd->revents & LWS_POLLOUT) + wsi->favoured_pollin = 1; + break; + } + /* + * he may have used up the + * writability above, if we will defer POLLOUT + * processing in favour of POLLIN, note it + */ + if (pollfd->revents & LWS_POLLOUT) + wsi->favoured_pollin = 1; + +try_pollout: + + /* this handles POLLOUT for http serving fragments */ + + if (!(pollfd->revents & LWS_POLLOUT)) + break; + + /* one shot */ + if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) { + lwsl_notice("%s a\n", __func__); + goto fail; + } + + if (wsi->mode == LWSCM_RAW) { + lws_stats_atomic_bump(wsi->context, pt, + LWSSTATS_C_WRITEABLE_CB, 1); +#if defined(LWS_WITH_STATS) + if (wsi->active_writable_req_us) { + uint64_t ul = time_in_microseconds() - + wsi->active_writable_req_us; + + lws_stats_atomic_bump(wsi->context, pt, + LWSSTATS_MS_WRITABLE_DELAY, ul); + lws_stats_atomic_max(wsi->context, pt, + LWSSTATS_MS_WORST_WRITABLE_DELAY, ul); + wsi->active_writable_req_us = 0; + } +#endif + n = user_callback_handle_rxflow(wsi->protocol->callback, + wsi, LWS_CALLBACK_RAW_WRITEABLE, + wsi->user_space, NULL, 0); + if (n < 0) { + lwsl_info("writeable_fail\n"); + goto fail; + } + break; + } + + if (!wsi->hdr_parsing_completed) + break; + + if (wsi->state != LWSS_HTTP_ISSUING_FILE) { + + lws_stats_atomic_bump(wsi->context, pt, + LWSSTATS_C_WRITEABLE_CB, 1); +#if defined(LWS_WITH_STATS) + if (wsi->active_writable_req_us) { + uint64_t ul = time_in_microseconds() - + wsi->active_writable_req_us; + + lws_stats_atomic_bump(wsi->context, pt, + LWSSTATS_MS_WRITABLE_DELAY, ul); + lws_stats_atomic_max(wsi->context, pt, + LWSSTATS_MS_WORST_WRITABLE_DELAY, ul); + wsi->active_writable_req_us = 0; + } +#endif + + n = user_callback_handle_rxflow(wsi->protocol->callback, + wsi, LWS_CALLBACK_HTTP_WRITEABLE, + wsi->user_space, NULL, 0); + if (n < 0) { + lwsl_info("writeable_fail\n"); + goto fail; + } + break; + } + + /* >0 == completion, <0 == error + * + * We'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when + * it's done. That's the case even if we just completed the + * send, so wait for that. + */ + n = lws_serve_http_file_fragment(wsi); + if (n < 0) + goto fail; + + break; + + case LWSCM_SERVER_LISTENER: + +#if LWS_POSIX + /* pollin means a client has connected to us then */ + + do { + if (!(pollfd->revents & LWS_POLLIN) || + !(pollfd->events & LWS_POLLIN)) + break; + +#ifdef LWS_OPENSSL_SUPPORT + /* + * can we really accept it, with regards to SSL limit? + * another vhost may also have had POLLIN on his listener this + * round and used it up already + */ + + if (wsi->vhost->use_ssl && + context->simultaneous_ssl_restriction && + context->simultaneous_ssl == + context->simultaneous_ssl_restriction) + /* no... ignore it, he won't come again until we are + * below the simultaneous_ssl_restriction limit and + * POLLIN is enabled on him again + */ + break; +#endif + /* listen socket got an unencrypted connection... */ + + clilen = sizeof(cli_addr); + lws_latency_pre(context, wsi); + + /* + * We cannot identify the peer who is in the listen + * socket connect queue before we accept it; even if + * we could, not accepting it due to PEER_LIMITS would + * block the connect queue for other legit peers. + */ + accept_fd = accept(pollfd->fd, (struct sockaddr *)&cli_addr, + &clilen); + lws_latency(context, wsi, "listener accept", accept_fd, + accept_fd >= 0); + if (accept_fd < 0) { + if (LWS_ERRNO == LWS_EAGAIN || + LWS_ERRNO == LWS_EWOULDBLOCK) { + break; + } + lwsl_err("ERROR on accept: %s\n", strerror(LWS_ERRNO)); + break; + } + + lws_plat_set_socket_options(wsi->vhost, accept_fd); + +#if defined(LWS_WITH_IPV6) + lwsl_debug("accepted new conn port %u on fd=%d\n", + ((cli_addr.ss_family == AF_INET6) ? + ntohs(((struct sockaddr_in6 *) &cli_addr)->sin6_port) : + ntohs(((struct sockaddr_in *) &cli_addr)->sin_port)), + accept_fd); +#else + lwsl_debug("accepted new conn port %u on fd=%d\n", + ntohs(((struct sockaddr_in *) &cli_addr)->sin_port), + accept_fd); +#endif + +#else + /* not very beautiful... */ + accept_fd = (lws_sockfd_type)pollfd; +#endif + /* + * look at who we connected to and give user code a chance + * to reject based on client IP. There's no protocol selected + * yet so we issue this to protocols[0] + */ + if ((wsi->vhost->protocols[0].callback)(wsi, + LWS_CALLBACK_FILTER_NETWORK_CONNECTION, + NULL, (void *)(lws_intptr_t)accept_fd, 0)) { + lwsl_debug("Callback denied network connection\n"); + compatible_close(accept_fd); + break; + } + + if (!(wsi->vhost->options & LWS_SERVER_OPTION_ONLY_RAW)) + opts |= LWS_ADOPT_HTTP; + else + opts = LWS_ADOPT_SOCKET; + + fd.sockfd = accept_fd; + if (!lws_adopt_descriptor_vhost(wsi->vhost, opts, fd, + NULL, NULL)) + /* already closed cleanly as necessary */ + return 1; + +#if LWS_POSIX + } while (pt->fds_count < context->fd_limit_per_thread - 1 && + lws_poll_listen_fd(&pt->fds[wsi->position_in_fds_table]) > 0); +#endif + return 0; + + default: + break; + } + + if (!lws_server_socket_service_ssl(wsi, accept_fd)) + return 0; + +fail: + lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS); + + return 1; +} + +LWS_VISIBLE int +lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type, + const char *other_headers, int other_headers_len) +{ + static const char * const intermediates[] = { "private", "public" }; + struct lws_context *context = lws_get_context(wsi); + struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi]; +#if defined(LWS_WITH_RANGES) + struct lws_range_parsing *rp = &wsi->u.http.range; +#endif + char cache_control[50], *cc = "no-store"; + unsigned char *response = pt->serv_buf + LWS_PRE; + unsigned char *p = response; + unsigned char *end = p + context->pt_serv_buf_size - LWS_PRE; + lws_filepos_t computed_total_content_length; + int ret = 0, cclen = 8, n = HTTP_STATUS_OK; + lws_fop_flags_t fflags = LWS_O_RDONLY; +#if defined(LWS_WITH_RANGES) + int ranges; +#endif + const struct lws_plat_file_ops *fops; + const char *vpath; + + /* + * We either call the platform fops .open with first arg platform fops, + * or we call fops_zip .open with first arg platform fops, and fops_zip + * open will decide whether to switch to fops_zip or stay with fops_def. + * + * If wsi->u.http.fop_fd is already set, the caller already opened it + */ + if (!wsi->u.http.fop_fd) { + fops = lws_vfs_select_fops(wsi->context->fops, file, &vpath); + fflags |= lws_vfs_prepare_flags(wsi); + wsi->u.http.fop_fd = fops->LWS_FOP_OPEN(wsi->context->fops, + file, vpath, &fflags); + if (!wsi->u.http.fop_fd) { + lwsl_err("Unable to open '%s'\n", file); + + return -1; + } + } + wsi->u.http.filelen = lws_vfs_get_length(wsi->u.http.fop_fd); + computed_total_content_length = wsi->u.http.filelen; + +#if defined(LWS_WITH_RANGES) + ranges = lws_ranges_init(wsi, rp, wsi->u.http.filelen); + + lwsl_debug("Range count %d\n", ranges); + /* + * no ranges -> 200; + * 1 range -> 206 + Content-Type: normal; Content-Range; + * more -> 206 + Content-Type: multipart/byteranges + * Repeat the true Content-Type in each multipart header + * along with Content-Range + */ + if (ranges < 0) { + /* it means he expressed a range in Range:, but it was illegal */ + lws_return_http_status(wsi, HTTP_STATUS_REQ_RANGE_NOT_SATISFIABLE, + NULL); + if (lws_http_transaction_completed(wsi)) + return -1; /* <0 means just hang up */ + + lws_vfs_file_close(&wsi->u.http.fop_fd); + + return 0; /* == 0 means we dealt with the transaction complete */ + } + if (ranges) + n = HTTP_STATUS_PARTIAL_CONTENT; +#endif + + if (lws_add_http_header_status(wsi, n, &p, end)) + return -1; + + if ((wsi->u.http.fop_fd->flags & (LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP | + LWS_FOP_FLAG_COMPR_IS_GZIP)) == + (LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP | LWS_FOP_FLAG_COMPR_IS_GZIP)) { + if (lws_add_http_header_by_token(wsi, + WSI_TOKEN_HTTP_CONTENT_ENCODING, + (unsigned char *)"gzip", 4, &p, end)) + return -1; + lwsl_info("file is being provided in gzip\n"); + } + + if ( +#if defined(LWS_WITH_RANGES) + ranges < 2 && +#endif + content_type && content_type[0]) + if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE, + (unsigned char *)content_type, + strlen(content_type), &p, end)) + return -1; + +#if defined(LWS_WITH_RANGES) + if (ranges >= 2) { /* multipart byteranges */ + strncpy(wsi->u.http.multipart_content_type, content_type, + sizeof(wsi->u.http.multipart_content_type) - 1); + wsi->u.http.multipart_content_type[ + sizeof(wsi->u.http.multipart_content_type) - 1] = '\0'; + if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE, + (unsigned char *)"multipart/byteranges; boundary=_lws", + 20, &p, end)) + return -1; + + /* + * our overall content length has to include + * + * - (n + 1) x "_lws\r\n" + * - n x Content-Type: xxx/xxx\r\n + * - n x Content-Range: bytes xxx-yyy/zzz\r\n + * - n x /r/n + * - the actual payloads (aggregated in rp->agg) + * + * Precompute it for the main response header + */ + + computed_total_content_length = (lws_filepos_t)rp->agg + + 6 /* final _lws\r\n */; + + lws_ranges_reset(rp); + while (lws_ranges_next(rp)) { + n = lws_snprintf(cache_control, sizeof(cache_control), + "bytes %llu-%llu/%llu", + rp->start, rp->end, rp->extent); + + computed_total_content_length += + 6 /* header _lws\r\n */ + + /* Content-Type: xxx/xxx\r\n */ + 14 + strlen(content_type) + 2 + + /* Content-Range: xxxx\r\n */ + 15 + n + 2 + + 2; /* /r/n */ + } + + lws_ranges_reset(rp); + lws_ranges_next(rp); + } + + if (ranges == 1) { + computed_total_content_length = (lws_filepos_t)rp->agg; + n = lws_snprintf(cache_control, sizeof(cache_control), + "bytes %llu-%llu/%llu", + rp->start, rp->end, rp->extent); + + if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_RANGE, + (unsigned char *)cache_control, + n, &p, end)) + return -1; + } + + wsi->u.http.range.inside = 0; + + if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ACCEPT_RANGES, + (unsigned char *)"bytes", 5, &p, end)) + return -1; +#endif + + if (!wsi->sending_chunked) { + if (lws_add_http_header_content_length(wsi, + computed_total_content_length, + &p, end)) + return -1; + } else { + if (lws_add_http_header_by_token(wsi, + WSI_TOKEN_HTTP_TRANSFER_ENCODING, + (unsigned char *)"chunked", + 7, &p, end)) + return -1; + } + + if (wsi->cache_secs && wsi->cache_reuse) { + if (wsi->cache_revalidate) { + cc = cache_control; + cclen = sprintf(cache_control, "%s max-age: %u", + intermediates[wsi->cache_intermediaries], + wsi->cache_secs); + } else { + cc = "no-cache"; + cclen = 8; + } + } + + if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CACHE_CONTROL, + (unsigned char *)cc, cclen, &p, end)) + return -1; + + if (wsi->u.http.connection_type == HTTP_CONNECTION_KEEP_ALIVE) + if (lws_add_http_header_by_token(wsi, WSI_TOKEN_CONNECTION, + (unsigned char *)"keep-alive", 10, &p, end)) + return -1; + + if (other_headers) { + if ((end - p) < other_headers_len) + return -1; + memcpy(p, other_headers, other_headers_len); + p += other_headers_len; + } + + if (lws_finalize_http_header(wsi, &p, end)) + return -1; + + ret = lws_write(wsi, response, p - response, LWS_WRITE_HTTP_HEADERS); + if (ret != (p - response)) { + lwsl_err("_write returned %d from %ld\n", ret, + (long)(p - response)); + return -1; + } + + wsi->u.http.filepos = 0; + wsi->state = LWSS_HTTP_ISSUING_FILE; + + lws_callback_on_writable(wsi); + + return 0; +} + +int +lws_interpret_incoming_packet(struct lws *wsi, unsigned char **buf, size_t len) +{ + int m; + + lwsl_parser("%s: received %d byte packet\n", __func__, (int)len); +#if 0 + lwsl_hexdump(*buf, len); +#endif + + /* let the rx protocol state machine have as much as it needs */ + + while (len) { + /* + * we were accepting input but now we stopped doing so + */ + if (wsi->rxflow_bitmap) { + lws_rxflow_cache(wsi, *buf, 0, len); + lwsl_parser("%s: cached %ld\n", __func__, (long)len); + return 1; + } + + if (wsi->u.ws.rx_draining_ext) { + m = lws_rx_sm(wsi, 0); + if (m < 0) + return -1; + continue; + } + + /* account for what we're using in rxflow buffer */ + if (wsi->rxflow_buffer) { + wsi->rxflow_pos++; + if (wsi->rxflow_pos > wsi->rxflow_len) { + lwsl_err("bumped rxflow buffer too far (%d / %d)", wsi->rxflow_pos, wsi->rxflow_len); + assert(0); + } + } + + /* consume payload bytes efficiently */ + if (wsi->lws_rx_parse_state == + LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED) { + m = lws_payload_until_length_exhausted(wsi, buf, &len); + if (wsi->rxflow_buffer) + wsi->rxflow_pos += m; + } + + if (wsi->rxflow_buffer && wsi->rxflow_pos == wsi->rxflow_len) { + lwsl_debug("%s: %p flow buf: drained\n", __func__, wsi); + lws_free_set_NULL(wsi->rxflow_buffer); + /* having drained the rxflow buffer, can rearm POLLIN */ +#ifdef LWS_NO_SERVER + m = +#endif + _lws_rx_flow_control(wsi); + /* m ignored, needed for NO_SERVER case */ + } + + /* process the byte */ + m = lws_rx_sm(wsi, *(*buf)++); + if (m < 0) + return -1; + len--; + } + + lwsl_parser("%s: exit with %d unused\n", __func__, (int)len); + + return 0; +} + +LWS_VISIBLE void +lws_server_get_canonical_hostname(struct lws_context *context, + struct lws_context_creation_info *info) +{ + if (lws_check_opt(info->options, + LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME)) + return; +#if LWS_POSIX && !defined(LWS_WITH_ESP32) + /* find canonical hostname */ + gethostname((char *)context->canonical_hostname, + sizeof(context->canonical_hostname) - 1); + + lwsl_info(" canonical_hostname = %s\n", context->canonical_hostname); +#else + (void)context; +#endif +} + + +LWS_VISIBLE LWS_EXTERN int +lws_chunked_html_process(struct lws_process_html_args *args, + struct lws_process_html_state *s) +{ + char *sp, buffer[32]; + const char *pc; + int old_len, n; + + /* do replacements */ + sp = args->p; + old_len = args->len; + args->len = 0; + s->start = sp; + while (sp < args->p + old_len) { + + if (args->len + 7 >= args->max_len) { + lwsl_err("Used up interpret padding\n"); + return -1; + } + + if ((!s->pos && *sp == '$') || s->pos) { + int hits = 0, hit = 0; + + if (!s->pos) + s->start = sp; + s->swallow[s->pos++] = *sp; + if (s->pos == sizeof(s->swallow) - 1) + goto skip; + for (n = 0; n < s->count_vars; n++) + if (!strncmp(s->swallow, s->vars[n], s->pos)) { + hits++; + hit = n; + } + if (!hits) { +skip: + s->swallow[s->pos] = '\0'; + memcpy(s->start, s->swallow, s->pos); + args->len++; + s->pos = 0; + sp = s->start + 1; + continue; + } + if (hits == 1 && s->pos == strlen(s->vars[hit])) { + pc = s->replace(s->data, hit); + if (!pc) + pc = "NULL"; + n = strlen(pc); + s->swallow[s->pos] = '\0'; + if (n != s->pos) { + memmove(s->start + n, + s->start + s->pos, + old_len - (sp - args->p)); + old_len += (n - s->pos) + 1; + } + memcpy(s->start, pc, n); + args->len++; + sp = s->start + 1; + + s->pos = 0; + } + sp++; + continue; + } + + args->len++; + sp++; + } + + /* no space left for final chunk trailer */ + if (args->final && args->len + 7 >= args->max_len) + return -1; + + n = sprintf(buffer, "%X\x0d\x0a", args->len); + + args->p -= n; + memcpy(args->p, buffer, n); + args->len += n; + + if (args->final) { + sp = args->p + args->len; + *sp++ = '\x0d'; + *sp++ = '\x0a'; + *sp++ = '0'; + *sp++ = '\x0d'; + *sp++ = '\x0a'; + *sp++ = '\x0d'; + *sp++ = '\x0a'; + args->len += 7; + } else { + sp = args->p + args->len; + *sp++ = '\x0d'; + *sp++ = '\x0a'; + args->len += 2; + } + + return 0; +} |