/* * libwebsockets - small server side websockets and web server implementation * * Copyright (C) 2010-2017 Andy Green * * 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; }