| /* |
| * libwebsockets - small server side websockets and web server implementation |
| * |
| * Copyright (C) 2010 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" |
| |
| #ifdef WIN32 |
| #include <tchar.h> |
| #include <io.h> |
| #else |
| #ifdef LWS_BUILTIN_GETIFADDRS |
| #include <getifaddrs.h> |
| #else |
| #include <ifaddrs.h> |
| #endif |
| #include <syslog.h> |
| #include <sys/un.h> |
| #include <sys/socket.h> |
| #include <netdb.h> |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| int openssl_websocket_private_data_index; |
| #endif |
| |
| #ifdef __MINGW32__ |
| #include "../win32port/win32helpers/websock-w32.c" |
| #else |
| #ifdef __MINGW64__ |
| #include "../win32port/win32helpers/websock-w32.c" |
| #endif |
| #endif |
| |
| #ifndef LWS_BUILD_HASH |
| #define LWS_BUILD_HASH "unknown-build-hash" |
| #endif |
| |
| static int log_level = LLL_ERR | LLL_WARN | LLL_NOTICE; |
| static void lwsl_emit_stderr(int level, const char *line); |
| static void (*lwsl_emit)(int level, const char *line) = lwsl_emit_stderr; |
| |
| static const char *library_version = LWS_LIBRARY_VERSION " " LWS_BUILD_HASH; |
| |
| static const char *log_level_names[] = { |
| "ERR", |
| "WARN", |
| "NOTICE", |
| "INFO", |
| "DEBUG", |
| "PARSER", |
| "HEADER", |
| "EXTENSION", |
| "CLIENT", |
| "LATENCY", |
| }; |
| |
| /** |
| * lws_get_library_version: get version and git hash library built from |
| * |
| * returns a const char * to a string like "1.1 178d78c" |
| * representing the library version followed by the git head hash it |
| * was built from |
| */ |
| |
| const char * |
| lws_get_library_version(void) |
| { |
| return library_version; |
| } |
| |
| int |
| insert_wsi_socket_into_fds(struct libwebsocket_context *context, struct libwebsocket *wsi) |
| { |
| if (context->fds_count >= context->max_fds) { |
| lwsl_err("Reached limit of fds tracking (%d)\n", context->max_fds); |
| return 1; |
| } |
| |
| if (wsi->sock > context->max_fds) { |
| lwsl_err("Socket fd %d is beyond what we can index (%d)\n", wsi->sock, context->max_fds); |
| return 1; |
| } |
| |
| assert(wsi); |
| assert(wsi->sock); |
| |
| lwsl_info("insert_wsi_socket_into_fds: wsi=%p, sock=%d, fds pos=%d\n", wsi, wsi->sock, context->fds_count); |
| |
| context->lws_lookup[wsi->sock] = wsi; |
| wsi->position_in_fds_table = context->fds_count; |
| context->fds[context->fds_count].fd = wsi->sock; |
| context->fds[context->fds_count].events = POLLIN; |
| context->fds[context->fds_count++].revents = 0; |
| |
| /* external POLL support via protocol 0 */ |
| context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_ADD_POLL_FD, |
| (void *)(long)wsi->sock, NULL, POLLIN); |
| |
| return 0; |
| } |
| |
| static int |
| remove_wsi_socket_from_fds(struct libwebsocket_context *context, struct libwebsocket *wsi) |
| { |
| int m; |
| |
| if (!--context->fds_count) |
| goto do_ext; |
| |
| if (wsi->sock > context->max_fds) { |
| lwsl_err("Socket fd %d is beyond what we can index (%d)\n", wsi->sock, context->max_fds); |
| return 1; |
| } |
| |
| lwsl_info("remove_wsi_socket_from_fds: wsi=%p, sock=%d, fds pos=%d\n", wsi, wsi->sock, wsi->position_in_fds_table); |
| |
| m = wsi->position_in_fds_table; /* replace the contents for this */ |
| |
| /* have the last guy take up the vacant slot */ |
| context->fds[m] = context->fds[context->fds_count]; /* vacant fds slot filled with end one */ |
| /* end guy's fds_lookup entry remains unchanged (still same fd pointing to same wsi) */ |
| /* end guy's "position in fds table" changed */ |
| context->lws_lookup[context->fds[context->fds_count].fd]->position_in_fds_table = m; |
| /* deletion guy's lws_lookup entry needs nuking */ |
| context->lws_lookup[wsi->sock] = NULL; /* no WSI for the socket of the wsi being removed*/ |
| wsi->position_in_fds_table = -1; /* removed wsi has no position any more */ |
| |
| do_ext: |
| /* remove also from external POLL support via protocol 0 */ |
| if (wsi->sock) |
| context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_DEL_POLL_FD, (void *)(long)wsi->sock, NULL, 0); |
| |
| return 0; |
| } |
| |
| |
| void |
| libwebsocket_close_and_free_session(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, enum lws_close_status reason) |
| { |
| int n; |
| int old_state; |
| unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 2 + |
| LWS_SEND_BUFFER_POST_PADDING]; |
| #ifndef LWS_NO_EXTENSIONS |
| int ret; |
| int m; |
| struct lws_tokens eff_buf; |
| struct libwebsocket_extension *ext; |
| #endif |
| |
| if (!wsi) |
| return; |
| |
| old_state = wsi->state; |
| |
| if (old_state == WSI_STATE_DEAD_SOCKET) |
| return; |
| |
| wsi->u.ws.close_reason = reason; |
| |
| if (wsi->mode == LWS_CONNMODE_HTTP_SERVING && wsi->u.http.fd) { |
| close(wsi->u.http.fd); |
| wsi->u.http.fd = 0; |
| } |
| |
| #ifndef LWS_NO_EXTENSIONS |
| /* |
| * are his extensions okay with him closing? Eg he might be a mux |
| * parent and just his ch1 aspect is closing? |
| */ |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) { |
| if (!wsi->active_extensions[n]->callback) |
| continue; |
| |
| m = wsi->active_extensions[n]->callback(context, |
| wsi->active_extensions[n], wsi, |
| LWS_EXT_CALLBACK_CHECK_OK_TO_REALLY_CLOSE, |
| wsi->active_extensions_user[n], NULL, 0); |
| |
| /* |
| * if somebody vetoed actually closing him at this time.... |
| * up to the extension to track the attempted close, let's |
| * just bail |
| */ |
| |
| if (m) { |
| lwsl_ext("extension vetoed close\n"); |
| return; |
| } |
| } |
| |
| /* |
| * flush any tx pending from extensions, since we may send close packet |
| * if there are problems with send, just nuke the connection |
| */ |
| |
| ret = 1; |
| while (ret == 1) { |
| |
| /* default to nobody has more to spill */ |
| |
| ret = 0; |
| eff_buf.token = NULL; |
| eff_buf.token_len = 0; |
| |
| /* show every extension the new incoming data */ |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) { |
| m = wsi->active_extensions[n]->callback( |
| wsi->protocol->owning_server, |
| wsi->active_extensions[n], wsi, |
| LWS_EXT_CALLBACK_FLUSH_PENDING_TX, |
| wsi->active_extensions_user[n], &eff_buf, 0); |
| if (m < 0) { |
| lwsl_ext("Extension reports fatal error\n"); |
| goto just_kill_connection; |
| } |
| if (m) |
| /* |
| * at least one extension told us he has more |
| * to spill, so we will go around again after |
| */ |
| ret = 1; |
| } |
| |
| /* assuming they left us something to send, send it */ |
| |
| if (eff_buf.token_len) |
| if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token, |
| eff_buf.token_len)) { |
| lwsl_debug("close: sending final extension spill had problems\n"); |
| goto just_kill_connection; |
| } |
| } |
| #endif |
| |
| /* |
| * signal we are closing, libsocket_write will |
| * add any necessary version-specific stuff. If the write fails, |
| * no worries we are closing anyway. If we didn't initiate this |
| * close, then our state has been changed to |
| * WSI_STATE_RETURNED_CLOSE_ALREADY and we will skip this. |
| * |
| * Likewise if it's a second call to close this connection after we |
| * sent the close indication to the peer already, we are in state |
| * WSI_STATE_AWAITING_CLOSE_ACK and will skip doing this a second time. |
| */ |
| |
| if (old_state == WSI_STATE_ESTABLISHED && |
| reason != LWS_CLOSE_STATUS_NOSTATUS) { |
| |
| lwsl_debug("sending close indication...\n"); |
| |
| n = libwebsocket_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING], |
| 0, LWS_WRITE_CLOSE); |
| if (!n) { |
| /* |
| * we have sent a nice protocol level indication we |
| * now wish to close, we should not send anything more |
| */ |
| |
| wsi->state = WSI_STATE_AWAITING_CLOSE_ACK; |
| |
| /* and we should wait for a reply for a bit out of politeness */ |
| |
| libwebsocket_set_timeout(wsi, |
| PENDING_TIMEOUT_CLOSE_ACK, 1); |
| |
| lwsl_debug("sent close indication, awaiting ack\n"); |
| |
| return; |
| } |
| |
| lwsl_info("close: sending the close packet failed, hanging up\n"); |
| |
| /* else, the send failed and we should just hang up */ |
| } |
| |
| #ifndef LWS_NO_EXTENSIONS |
| just_kill_connection: |
| #endif |
| |
| lwsl_debug("libwebsocket_close_and_free_session: just_kill_connection\n"); |
| |
| /* |
| * we won't be servicing or receiving anything further from this guy |
| * delete socket from the internal poll list if still present |
| */ |
| |
| remove_wsi_socket_from_fds(context, wsi); |
| |
| wsi->state = WSI_STATE_DEAD_SOCKET; |
| |
| if (old_state == WSI_STATE_ESTABLISHED && wsi->u.ws.rx_user_buffer) { |
| free(wsi->u.ws.rx_user_buffer); |
| wsi->u.ws.rx_user_buffer = NULL; |
| } |
| |
| /* tell the user it's all over for this guy */ |
| |
| if (wsi->protocol && wsi->protocol->callback && |
| ((old_state == WSI_STATE_ESTABLISHED) || |
| (old_state == WSI_STATE_RETURNED_CLOSE_ALREADY) || |
| (old_state == WSI_STATE_AWAITING_CLOSE_ACK))) { |
| lwsl_debug("calling back CLOSED\n"); |
| wsi->protocol->callback(context, wsi, LWS_CALLBACK_CLOSED, |
| wsi->user_space, NULL, 0); |
| } else |
| lwsl_debug("not calling back closed, old_state=%d\n", old_state); |
| |
| #ifndef LWS_NO_EXTENSIONS |
| /* deallocate any active extension contexts */ |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) { |
| if (!wsi->active_extensions[n]->callback) |
| continue; |
| |
| wsi->active_extensions[n]->callback(context, |
| wsi->active_extensions[n], wsi, |
| LWS_EXT_CALLBACK_DESTROY, |
| wsi->active_extensions_user[n], NULL, 0); |
| |
| free(wsi->active_extensions_user[n]); |
| } |
| |
| /* |
| * inform all extensions in case they tracked this guy out of band |
| * even though not active on him specifically |
| */ |
| |
| ext = context->extensions; |
| while (ext && ext->callback) { |
| ext->callback(context, ext, wsi, |
| LWS_EXT_CALLBACK_DESTROY_ANY_WSI_CLOSING, |
| NULL, NULL, 0); |
| ext++; |
| } |
| #endif |
| |
| #ifndef LWS_NO_CLIENT |
| if (wsi->c_address) |
| free(wsi->c_address); |
| #endif |
| if (wsi->u.ws.rxflow_buffer) |
| free(wsi->u.ws.rxflow_buffer); |
| |
| /* lwsl_info("closing fd=%d\n", wsi->sock); */ |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (wsi->ssl) { |
| n = SSL_get_fd(wsi->ssl); |
| SSL_shutdown(wsi->ssl); |
| compatible_close(n); |
| SSL_free(wsi->ssl); |
| } else { |
| #endif |
| if (wsi->sock) { |
| n = shutdown(wsi->sock, SHUT_RDWR); |
| if (n) |
| lwsl_debug("closing: shutdown returned %d\n", errno); |
| |
| n = compatible_close(wsi->sock); |
| if (n) |
| lwsl_debug("closing: close returned %d\n", errno); |
| } |
| #ifdef LWS_OPENSSL_SUPPORT |
| } |
| #endif |
| if (wsi->protocol && wsi->protocol->per_session_data_size && wsi->user_space) /* user code may own */ |
| free(wsi->user_space); |
| |
| free(wsi); |
| } |
| |
| /** |
| * libwebsockets_hangup_on_client() - Server calls to terminate client |
| * connection |
| * @context: libwebsockets context |
| * @fd: Connection socket descriptor |
| */ |
| |
| void |
| libwebsockets_hangup_on_client(struct libwebsocket_context *context, int fd) |
| { |
| struct libwebsocket *wsi = context->lws_lookup[fd]; |
| |
| if (wsi) { |
| lwsl_info("closing connection at libwebsockets_hangup_on_client:\n"); |
| libwebsocket_close_and_free_session(context, |
| wsi, LWS_CLOSE_STATUS_NOSTATUS); |
| } else |
| close(fd); |
| } |
| |
| |
| /** |
| * libwebsockets_get_peer_addresses() - Get client address information |
| * @context: Libwebsockets context |
| * @wsi: Local struct libwebsocket associated with |
| * @fd: Connection socket descriptor |
| * @name: Buffer to take client address name |
| * @name_len: Length of client address name buffer |
| * @rip: Buffer to take client address IP qotted quad |
| * @rip_len: Length of client address IP buffer |
| * |
| * This function fills in @name and @rip with the name and IP of |
| * the client connected with socket descriptor @fd. Names may be |
| * truncated if there is not enough room. If either cannot be |
| * determined, they will be returned as valid zero-length strings. |
| */ |
| |
| void |
| libwebsockets_get_peer_addresses(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, int fd, char *name, int name_len, |
| char *rip, int rip_len) |
| { |
| unsigned int len; |
| struct sockaddr_in sin; |
| struct hostent *host; |
| struct hostent *host1; |
| char ip[128]; |
| unsigned char *p; |
| int n; |
| int ret = -1; |
| #ifdef AF_LOCAL |
| struct sockaddr_un *un; |
| #endif |
| |
| rip[0] = '\0'; |
| name[0] = '\0'; |
| |
| lws_latency_pre(context, wsi); |
| |
| len = sizeof sin; |
| if (getpeername(fd, (struct sockaddr *) &sin, &len) < 0) { |
| perror("getpeername"); |
| goto bail; |
| } |
| |
| host = gethostbyaddr((char *) &sin.sin_addr, sizeof sin.sin_addr, |
| AF_INET); |
| if (host == NULL) { |
| perror("gethostbyaddr"); |
| goto bail; |
| } |
| |
| strncpy(name, host->h_name, name_len); |
| name[name_len - 1] = '\0'; |
| |
| host1 = gethostbyname(host->h_name); |
| if (host1 == NULL) |
| goto bail; |
| p = (unsigned char *)host1; |
| n = 0; |
| while (p != NULL) { |
| p = (unsigned char *)host1->h_addr_list[n++]; |
| if (p == NULL) |
| continue; |
| if ((host1->h_addrtype != AF_INET) |
| #ifdef AF_LOCAL |
| && (host1->h_addrtype != AF_LOCAL) |
| #endif |
| ) |
| continue; |
| |
| if (host1->h_addrtype == AF_INET) |
| sprintf(ip, "%u.%u.%u.%u", p[0], p[1], p[2], p[3]); |
| #ifdef AF_LOCAL |
| else { |
| un = (struct sockaddr_un *)p; |
| strncpy(ip, un->sun_path, sizeof(ip) - 1); |
| ip[sizeof(ip) - 1] = '\0'; |
| } |
| #endif |
| p = NULL; |
| strncpy(rip, ip, rip_len); |
| rip[rip_len - 1] = '\0'; |
| } |
| |
| ret = 0; |
| bail: |
| lws_latency(context, wsi, "libwebsockets_get_peer_addresses", ret, 1); |
| } |
| |
| int libwebsockets_get_random(struct libwebsocket_context *context, |
| void *buf, int len) |
| { |
| int n; |
| char *p = (char *)buf; |
| |
| #ifdef WIN32 |
| for (n = 0; n < len; n++) |
| p[n] = (unsigned char)rand(); |
| #else |
| n = read(context->fd_random, p, len); |
| #endif |
| |
| return n; |
| } |
| |
| int lws_set_socket_options(struct libwebsocket_context *context, int fd) |
| { |
| int optval = 1; |
| socklen_t optlen = sizeof(optval); |
| #ifdef WIN32 |
| unsigned long optl = 0; |
| #endif |
| #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) |
| struct protoent *tcp_proto; |
| #endif |
| |
| if (context->ka_time) { |
| /* enable keepalive on this socket */ |
| optval = 1; |
| if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, |
| (const void *)&optval, optlen) < 0) |
| return 1; |
| |
| #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) |
| |
| /* |
| * didn't find a way to set these per-socket, need to |
| * tune kernel systemwide values |
| */ |
| |
| #else |
| /* set the keepalive conditions we want on it too */ |
| optval = context->ka_time; |
| if (setsockopt(fd, IPPROTO_IP, TCP_KEEPIDLE, |
| (const void *)&optval, optlen) < 0) |
| return 1; |
| |
| optval = context->ka_probes; |
| if (setsockopt(fd, IPPROTO_IP, TCP_KEEPINTVL, |
| (const void *)&optval, optlen) < 0) |
| return 1; |
| |
| optval = context->ka_interval; |
| if (setsockopt(fd, IPPROTO_IP, TCP_KEEPCNT, |
| (const void *)&optval, optlen) < 0) |
| return 1; |
| #endif |
| } |
| |
| /* Disable Nagle */ |
| optval = 1; |
| #if !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__NetBSD__) |
| setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen); |
| #else |
| tcp_proto = getprotobyname("TCP"); |
| setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen); |
| #endif |
| |
| /* We are nonblocking... */ |
| #ifdef WIN32 |
| ioctlsocket(fd, FIONBIO, &optl); |
| #else |
| fcntl(fd, F_SETFL, O_NONBLOCK); |
| #endif |
| |
| return 0; |
| } |
| |
| int lws_send_pipe_choked(struct libwebsocket *wsi) |
| { |
| struct pollfd fds; |
| |
| fds.fd = wsi->sock; |
| fds.events = POLLOUT; |
| fds.revents = 0; |
| |
| if (poll(&fds, 1, 0) != 1) |
| return 1; |
| |
| if ((fds.revents & POLLOUT) == 0) |
| return 1; |
| |
| /* okay to send another packet without blocking */ |
| |
| return 0; |
| } |
| |
| int |
| lws_handle_POLLOUT_event(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, struct pollfd *pollfd) |
| { |
| int n; |
| |
| #ifndef LWS_NO_EXTENSIONS |
| struct lws_tokens eff_buf; |
| int ret; |
| int m; |
| int handled = 0; |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) { |
| if (!wsi->active_extensions[n]->callback) |
| continue; |
| |
| m = wsi->active_extensions[n]->callback(context, |
| wsi->active_extensions[n], wsi, |
| LWS_EXT_CALLBACK_IS_WRITEABLE, |
| wsi->active_extensions_user[n], NULL, 0); |
| if (m > handled) |
| handled = m; |
| } |
| |
| if (handled == 1) |
| goto notify_action; |
| |
| if (!wsi->extension_data_pending || handled == 2) |
| goto user_service; |
| |
| /* |
| * check in on the active extensions, see if they |
| * had pending stuff to spill... they need to get the |
| * first look-in otherwise sequence will be disordered |
| * |
| * NULL, zero-length eff_buf means just spill pending |
| */ |
| |
| ret = 1; |
| while (ret == 1) { |
| |
| /* default to nobody has more to spill */ |
| |
| ret = 0; |
| eff_buf.token = NULL; |
| eff_buf.token_len = 0; |
| |
| /* give every extension a chance to spill */ |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) { |
| m = wsi->active_extensions[n]->callback( |
| wsi->protocol->owning_server, |
| wsi->active_extensions[n], wsi, |
| LWS_EXT_CALLBACK_PACKET_TX_PRESEND, |
| wsi->active_extensions_user[n], &eff_buf, 0); |
| if (m < 0) { |
| lwsl_err("ext reports fatal error\n"); |
| return -1; |
| } |
| if (m) |
| /* |
| * at least one extension told us he has more |
| * to spill, so we will go around again after |
| */ |
| ret = 1; |
| } |
| |
| /* assuming they gave us something to send, send it */ |
| |
| if (eff_buf.token_len) { |
| if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token, |
| eff_buf.token_len)) |
| return -1; |
| } else |
| continue; |
| |
| /* no extension has more to spill */ |
| |
| if (!ret) |
| continue; |
| |
| /* |
| * There's more to spill from an extension, but we just sent |
| * something... did that leave the pipe choked? |
| */ |
| |
| if (!lws_send_pipe_choked(wsi)) |
| /* no we could add more */ |
| continue; |
| |
| lwsl_info("choked in POLLOUT service\n"); |
| |
| /* |
| * Yes, he's choked. Leave the POLLOUT masked on so we will |
| * come back here when he is unchoked. Don't call the user |
| * callback to enforce ordering of spilling, he'll get called |
| * when we come back here and there's nothing more to spill. |
| */ |
| |
| return 0; |
| } |
| |
| wsi->extension_data_pending = 0; |
| |
| user_service: |
| #endif |
| /* one shot */ |
| |
| if (pollfd) { |
| pollfd->events &= ~POLLOUT; |
| |
| /* external POLL support via protocol 0 */ |
| context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_CLEAR_MODE_POLL_FD, |
| (void *)(long)wsi->sock, NULL, POLLOUT); |
| } |
| #ifndef LWS_NO_EXTENSIONS |
| notify_action: |
| #endif |
| |
| if (wsi->mode == LWS_CONNMODE_WS_CLIENT) |
| n = LWS_CALLBACK_CLIENT_WRITEABLE; |
| else |
| n = LWS_CALLBACK_SERVER_WRITEABLE; |
| |
| return user_callback_handle_rxflow(wsi->protocol->callback, context, |
| wsi, (enum libwebsocket_callback_reasons) n, wsi->user_space, NULL, 0); |
| } |
| |
| |
| |
| void |
| libwebsocket_service_timeout_check(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, unsigned int sec) |
| { |
| #ifndef LWS_NO_EXTENSIONS |
| int n; |
| |
| /* |
| * if extensions want in on it (eg, we are a mux parent) |
| * give them a chance to service child timeouts |
| */ |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) |
| wsi->active_extensions[n]->callback( |
| context, wsi->active_extensions[n], |
| wsi, LWS_EXT_CALLBACK_1HZ, |
| wsi->active_extensions_user[n], NULL, sec); |
| |
| #endif |
| if (!wsi->pending_timeout) |
| return; |
| |
| /* |
| * if we went beyond the allowed time, kill the |
| * connection |
| */ |
| |
| if (sec > wsi->pending_timeout_limit) { |
| lwsl_info("TIMEDOUT WAITING\n"); |
| libwebsocket_close_and_free_session(context, |
| wsi, LWS_CLOSE_STATUS_NOSTATUS); |
| } |
| } |
| |
| /** |
| * libwebsocket_service_fd() - Service polled socket with something waiting |
| * @context: Websocket context |
| * @pollfd: The pollfd entry describing the socket fd and which events |
| * happened. |
| * |
| * This function takes a pollfd that has POLLIN or POLLOUT activity and |
| * services it according to the state of the associated struct libwebsocket. |
| * |
| * The one call deals with all "service" that might happen on a socket |
| * including listen accepts, http files as well as websocket protocol. |
| */ |
| |
| int |
| libwebsocket_service_fd(struct libwebsocket_context *context, |
| struct pollfd *pollfd) |
| { |
| struct libwebsocket *wsi; |
| int n; |
| int m; |
| int listen_socket_fds_index = 0; |
| struct timeval tv; |
| |
| #ifndef LWS_NO_EXTENSIONS |
| int more = 1; |
| #endif |
| struct lws_tokens eff_buf; |
| #ifndef LWS_NO_CLIENT |
| extern int lws_client_socket_service(struct libwebsocket_context *context, struct libwebsocket *wsi, struct pollfd *pollfd); |
| #endif |
| #ifndef LWS_NO_SERVER |
| extern int lws_server_socket_service(struct libwebsocket_context *context, struct libwebsocket *wsi, struct pollfd *pollfd); |
| #endif |
| |
| if (context->listen_service_fd) |
| listen_socket_fds_index = context->lws_lookup[ |
| context->listen_service_fd]->position_in_fds_table; |
| |
| /* |
| * you can call us with pollfd = NULL to just allow the once-per-second |
| * global timeout checks; if less than a second since the last check |
| * it returns immediately then. |
| */ |
| |
| gettimeofday(&tv, NULL); |
| |
| if (context->last_timeout_check_s != tv.tv_sec) { |
| context->last_timeout_check_s = tv.tv_sec; |
| |
| #ifndef WIN32 |
| /* if our parent went down, don't linger around */ |
| if (context->started_with_parent && kill(context->started_with_parent, 0) < 0) |
| kill(getpid(), SIGTERM); |
| #endif |
| |
| /* global timeout check once per second */ |
| |
| for (n = 0; n < context->fds_count; n++) { |
| struct libwebsocket *new_wsi = context->lws_lookup[context->fds[n].fd]; |
| if (!new_wsi) |
| continue; |
| libwebsocket_service_timeout_check(context, |
| new_wsi, tv.tv_sec); |
| } |
| } |
| |
| /* just here for timeout management? */ |
| |
| if (pollfd == NULL) |
| return 0; |
| |
| /* no, here to service a socket descriptor */ |
| |
| /* |
| * deal with listen service piggybacking |
| * every listen_service_modulo services of other fds, we |
| * sneak one in to service the listen socket if there's anything waiting |
| * |
| * To handle connection storms, as found in ab, if we previously saw a |
| * pending connection here, it causes us to check again next time. |
| */ |
| |
| if (context->listen_service_fd && pollfd != &context->fds[listen_socket_fds_index]) { |
| context->listen_service_count++; |
| if (context->listen_service_extraseen || |
| context->listen_service_count == context->listen_service_modulo) { |
| context->listen_service_count = 0; |
| m = 1; |
| if (context->listen_service_extraseen > 5) |
| m = 2; |
| while (m--) { |
| /* even with extpoll, we prepared this internal fds for listen */ |
| n = poll(&context->fds[listen_socket_fds_index], 1, 0); |
| if (n > 0) { /* there's a connection waiting for us */ |
| libwebsocket_service_fd(context, &context->fds[listen_socket_fds_index]); |
| context->listen_service_extraseen++; |
| } else { |
| if (context->listen_service_extraseen) |
| context->listen_service_extraseen--; |
| break; |
| } |
| } |
| } |
| |
| } |
| |
| /* okay, what we came here to do... */ |
| |
| wsi = context->lws_lookup[pollfd->fd]; |
| if (wsi == NULL) { |
| if (pollfd->fd > 11) |
| lwsl_err("unexpected NULL wsi fd=%d fds_count=%d\n", pollfd->fd, context->fds_count); |
| return 0; |
| } |
| |
| switch (wsi->mode) { |
| |
| #ifndef LWS_NO_SERVER |
| case LWS_CONNMODE_HTTP_SERVING: |
| case LWS_CONNMODE_SERVER_LISTENER: |
| case LWS_CONNMODE_SSL_ACK_PENDING: |
| return lws_server_socket_service(context, wsi, pollfd); |
| #endif |
| |
| case LWS_CONNMODE_WS_SERVING: |
| case LWS_CONNMODE_WS_CLIENT: |
| |
| /* handle session socket closed */ |
| |
| if (pollfd->revents & (POLLERR | POLLHUP)) { |
| |
| lwsl_debug("Session Socket %p (fd=%d) dead\n", |
| (void *)wsi, pollfd->fd); |
| |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| |
| /* the guy requested a callback when it was OK to write */ |
| |
| if ((pollfd->revents & POLLOUT) && |
| wsi->state == WSI_STATE_ESTABLISHED) |
| if (lws_handle_POLLOUT_event(context, wsi, |
| pollfd) < 0) { |
| libwebsocket_close_and_free_session( |
| context, wsi, LWS_CLOSE_STATUS_NORMAL); |
| return 0; |
| } |
| |
| |
| /* any incoming data ready? */ |
| |
| if (!(pollfd->revents & POLLIN)) |
| break; |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| read_pending: |
| if (wsi->ssl) { |
| eff_buf.token_len = SSL_read(wsi->ssl, |
| context->service_buffer, |
| sizeof context->service_buffer); |
| if (!eff_buf.token_len) { |
| n = SSL_get_error(wsi->ssl, eff_buf.token_len); |
| lwsl_err("SSL_read returned 0 with reason %s\n", |
| ERR_error_string(n, (char *)context->service_buffer)); |
| } |
| } else |
| #endif |
| eff_buf.token_len = recv(pollfd->fd, |
| context->service_buffer, |
| sizeof context->service_buffer, 0); |
| |
| if (eff_buf.token_len < 0) { |
| lwsl_debug("Socket read returned %d\n", |
| eff_buf.token_len); |
| if (errno != EINTR && errno != EAGAIN) |
| libwebsocket_close_and_free_session(context, |
| wsi, LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| if (!eff_buf.token_len) { |
| lwsl_info("closing connection due to zero length read\n"); |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| |
| /* |
| * give any active extensions a chance to munge the buffer |
| * before parse. We pass in a pointer to an lws_tokens struct |
| * prepared with the default buffer and content length that's in |
| * there. Rather than rewrite the default buffer, extensions |
| * that expect to grow the buffer can adapt .token to |
| * point to their own per-connection buffer in the extension |
| * user allocation. By default with no extensions or no |
| * extension callback handling, just the normal input buffer is |
| * used then so it is efficient. |
| */ |
| |
| eff_buf.token = (char *)context->service_buffer; |
| #ifndef LWS_NO_EXTENSIONS |
| more = 1; |
| while (more) { |
| |
| more = 0; |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) { |
| m = wsi->active_extensions[n]->callback(context, |
| wsi->active_extensions[n], wsi, |
| LWS_EXT_CALLBACK_PACKET_RX_PREPARSE, |
| wsi->active_extensions_user[n], |
| &eff_buf, 0); |
| if (m < 0) { |
| lwsl_ext( |
| "Extension reports fatal error\n"); |
| libwebsocket_close_and_free_session( |
| context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| if (m) |
| more = 1; |
| } |
| #endif |
| /* service incoming data */ |
| |
| if (eff_buf.token_len) { |
| n = libwebsocket_read(context, wsi, |
| (unsigned char *)eff_buf.token, |
| eff_buf.token_len); |
| if (n < 0) |
| /* we closed wsi */ |
| return 0; |
| } |
| #ifndef LWS_NO_EXTENSIONS |
| eff_buf.token = NULL; |
| eff_buf.token_len = 0; |
| } |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (wsi->ssl && SSL_pending(wsi->ssl)) |
| goto read_pending; |
| #endif |
| break; |
| |
| default: |
| #ifdef LWS_NO_CLIENT |
| break; |
| #else |
| return lws_client_socket_service(context, wsi, pollfd); |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| |
| /** |
| * libwebsocket_context_destroy() - Destroy the websocket context |
| * @context: Websocket context |
| * |
| * This function closes any active connections and then frees the |
| * context. After calling this, any further use of the context is |
| * undefined. |
| */ |
| void |
| libwebsocket_context_destroy(struct libwebsocket_context *context) |
| { |
| #ifndef LWS_NO_EXTENSIONS |
| int n; |
| int m; |
| struct libwebsocket_extension *ext; |
| |
| #ifdef LWS_LATENCY |
| if (context->worst_latency_info[0]) |
| lwsl_notice("Worst latency: %s\n", context->worst_latency_info); |
| #endif |
| |
| for (n = 0; n < context->fds_count; n++) { |
| struct libwebsocket *wsi = context->lws_lookup[context->fds[n].fd]; |
| libwebsocket_close_and_free_session(context, |
| wsi, LWS_CLOSE_STATUS_GOINGAWAY); |
| } |
| |
| /* |
| * give all extensions a chance to clean up any per-context |
| * allocations they might have made |
| */ |
| |
| ext = context->extensions; |
| m = LWS_EXT_CALLBACK_CLIENT_CONTEXT_DESTRUCT; |
| if (context->listen_port) |
| m = LWS_EXT_CALLBACK_SERVER_CONTEXT_DESTRUCT; |
| while (ext && ext->callback) { |
| ext->callback(context, ext, NULL, (enum libwebsocket_extension_callback_reasons)m, NULL, NULL, 0); |
| ext++; |
| } |
| #endif |
| |
| #ifdef WIN32 |
| #else |
| close(context->fd_random); |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (context->ssl_ctx) |
| SSL_CTX_free(context->ssl_ctx); |
| if (context->ssl_client_ctx) |
| SSL_CTX_free(context->ssl_client_ctx); |
| #endif |
| |
| free(context); |
| |
| #ifdef WIN32 |
| WSACleanup(); |
| #endif |
| } |
| |
| /** |
| * libwebsocket_context_user() - get the user data associated with the whole context |
| * @context: Websocket context |
| * |
| * This returns the optional user allocation that can be attached to |
| * the context the sockets live in at context_create time. It's a way |
| * to let all sockets serviced in the same context share data without |
| * using globals statics in the user code. |
| */ |
| |
| |
| LWS_EXTERN void * |
| libwebsocket_context_user(struct libwebsocket_context *context) |
| { |
| return context->user_space; |
| } |
| |
| /** |
| * libwebsocket_service() - Service any pending websocket activity |
| * @context: Websocket context |
| * @timeout_ms: Timeout for poll; 0 means return immediately if nothing needed |
| * service otherwise block and service immediately, returning |
| * after the timeout if nothing needed service. |
| * |
| * This function deals with any pending websocket traffic, for three |
| * kinds of event. It handles these events on both server and client |
| * types of connection the same. |
| * |
| * 1) Accept new connections to our context's server |
| * |
| * 2) Call the receive callback for incoming frame data received by |
| * server or client connections. |
| * |
| * You need to call this service function periodically to all the above |
| * functions to happen; if your application is single-threaded you can |
| * just call it in your main event loop. |
| * |
| * Alternatively you can fork a new process that asynchronously handles |
| * calling this service in a loop. In that case you are happy if this |
| * call blocks your thread until it needs to take care of something and |
| * would call it with a large nonzero timeout. Your loop then takes no |
| * CPU while there is nothing happening. |
| * |
| * If you are calling it in a single-threaded app, you don't want it to |
| * wait around blocking other things in your loop from happening, so you |
| * would call it with a timeout_ms of 0, so it returns immediately if |
| * nothing is pending, or as soon as it services whatever was pending. |
| */ |
| |
| |
| int |
| libwebsocket_service(struct libwebsocket_context *context, int timeout_ms) |
| { |
| int n; |
| |
| /* stay dead once we are dead */ |
| |
| if (context == NULL) |
| return 1; |
| |
| /* wait for something to need service */ |
| |
| n = poll(context->fds, context->fds_count, timeout_ms); |
| if (n == 0) /* poll timeout */ |
| return 0; |
| |
| if (n < 0) |
| return -1; |
| |
| /* any socket with events to service? */ |
| |
| for (n = 0; n < context->fds_count; n++) |
| if (context->fds[n].revents) |
| if (libwebsocket_service_fd(context, |
| &context->fds[n]) < 0) |
| return -1; |
| return 0; |
| } |
| |
| #ifndef LWS_NO_EXTENSIONS |
| int |
| lws_any_extension_handled(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, |
| enum libwebsocket_extension_callback_reasons r, |
| void *v, size_t len) |
| { |
| int n; |
| int handled = 0; |
| |
| /* maybe an extension will take care of it for us */ |
| |
| for (n = 0; n < wsi->count_active_extensions && !handled; n++) { |
| if (!wsi->active_extensions[n]->callback) |
| continue; |
| |
| handled |= wsi->active_extensions[n]->callback(context, |
| wsi->active_extensions[n], wsi, |
| r, wsi->active_extensions_user[n], v, len); |
| } |
| |
| return handled; |
| } |
| |
| |
| void * |
| lws_get_extension_user_matching_ext(struct libwebsocket *wsi, |
| struct libwebsocket_extension *ext) |
| { |
| int n = 0; |
| |
| if (wsi == NULL) |
| return NULL; |
| |
| while (n < wsi->count_active_extensions) { |
| if (wsi->active_extensions[n] != ext) { |
| n++; |
| continue; |
| } |
| return wsi->active_extensions_user[n]; |
| } |
| |
| return NULL; |
| } |
| #endif |
| |
| /** |
| * libwebsocket_callback_on_writable() - Request a callback when this socket |
| * becomes able to be written to without |
| * blocking |
| * |
| * @context: libwebsockets context |
| * @wsi: Websocket connection instance to get callback for |
| */ |
| |
| int |
| libwebsocket_callback_on_writable(struct libwebsocket_context *context, |
| struct libwebsocket *wsi) |
| { |
| #ifndef LWS_NO_EXTENSIONS |
| int n; |
| int handled = 0; |
| |
| /* maybe an extension will take care of it for us */ |
| |
| for (n = 0; n < wsi->count_active_extensions; n++) { |
| if (!wsi->active_extensions[n]->callback) |
| continue; |
| |
| handled |= wsi->active_extensions[n]->callback(context, |
| wsi->active_extensions[n], wsi, |
| LWS_EXT_CALLBACK_REQUEST_ON_WRITEABLE, |
| wsi->active_extensions_user[n], NULL, 0); |
| } |
| |
| if (handled) |
| return 1; |
| #endif |
| if (wsi->position_in_fds_table < 0) { |
| lwsl_err("libwebsocket_callback_on_writable: " |
| "failed to find socket %d\n", wsi->sock); |
| return -1; |
| } |
| |
| context->fds[wsi->position_in_fds_table].events |= POLLOUT; |
| |
| /* external POLL support via protocol 0 */ |
| context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_SET_MODE_POLL_FD, |
| (void *)(long)wsi->sock, NULL, POLLOUT); |
| |
| return 1; |
| } |
| |
| /** |
| * libwebsocket_callback_on_writable_all_protocol() - Request a callback for |
| * all connections using the given protocol when it |
| * becomes possible to write to each socket without |
| * blocking in turn. |
| * |
| * @protocol: Protocol whose connections will get callbacks |
| */ |
| |
| int |
| libwebsocket_callback_on_writable_all_protocol( |
| const struct libwebsocket_protocols *protocol) |
| { |
| struct libwebsocket_context *context = protocol->owning_server; |
| int n; |
| struct libwebsocket *wsi; |
| |
| for (n = 0; n < context->fds_count; n++) { |
| wsi = context->lws_lookup[context->fds[n].fd]; |
| if (!wsi) |
| continue; |
| if (wsi->protocol == protocol) |
| libwebsocket_callback_on_writable(context, wsi); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * libwebsocket_set_timeout() - marks the wsi as subject to a timeout |
| * |
| * You will not need this unless you are doing something special |
| * |
| * @wsi: Websocket connection instance |
| * @reason: timeout reason |
| * @secs: how many seconds |
| */ |
| |
| void |
| libwebsocket_set_timeout(struct libwebsocket *wsi, |
| enum pending_timeout reason, int secs) |
| { |
| struct timeval tv; |
| |
| gettimeofday(&tv, NULL); |
| |
| wsi->pending_timeout_limit = tv.tv_sec + secs; |
| wsi->pending_timeout = reason; |
| } |
| |
| |
| /** |
| * libwebsocket_get_socket_fd() - returns the socket file descriptor |
| * |
| * You will not need this unless you are doing something special |
| * |
| * @wsi: Websocket connection instance |
| */ |
| |
| int |
| libwebsocket_get_socket_fd(struct libwebsocket *wsi) |
| { |
| return wsi->sock; |
| } |
| |
| #ifdef LWS_LATENCY |
| void |
| lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi, const char *action, int ret, int completed) |
| { |
| struct timeval tv; |
| unsigned long u; |
| char buf[256]; |
| |
| gettimeofday(&tv, NULL); |
| |
| u = (tv.tv_sec * 1000000) + tv.tv_usec; |
| |
| if (action) { |
| if (completed) { |
| if (wsi->action_start == wsi->latency_start) |
| sprintf(buf, "Completion first try lat %luus: %p: ret %d: %s\n", u - wsi->latency_start, (void *)wsi, ret, action); |
| else |
| sprintf(buf, "Completion %luus: lat %luus: %p: ret %d: %s\n", u - wsi->action_start, u - wsi->latency_start, (void *)wsi, ret, action); |
| wsi->action_start = 0; |
| } else |
| sprintf(buf, "lat %luus: %p: ret %d: %s\n", u - wsi->latency_start, (void *)wsi, ret, action); |
| if (u - wsi->latency_start > context->worst_latency) { |
| context->worst_latency = u - wsi->latency_start; |
| strcpy(context->worst_latency_info, buf); |
| } |
| lwsl_latency("%s", buf); |
| } else { |
| wsi->latency_start = u; |
| if (!wsi->action_start) |
| wsi->action_start = u; |
| } |
| } |
| #endif |
| |
| #ifdef LWS_NO_SERVER |
| int |
| _libwebsocket_rx_flow_control(struct libwebsocket *wsi) |
| { |
| return 0; |
| } |
| #else |
| int |
| _libwebsocket_rx_flow_control(struct libwebsocket *wsi) |
| { |
| struct libwebsocket_context *context = wsi->protocol->owning_server; |
| int n; |
| |
| if (!(wsi->u.ws.rxflow_change_to & 2)) |
| return 0; |
| |
| wsi->u.ws.rxflow_change_to &= ~2; |
| |
| lwsl_info("rxflow: wsi %p change_to %d\n", wsi, wsi->u.ws.rxflow_change_to); |
| |
| /* if we're letting it come again, did we interrupt anything? */ |
| if ((wsi->u.ws.rxflow_change_to & 1) && wsi->u.ws.rxflow_buffer) { |
| n = libwebsocket_interpret_incoming_packet(wsi, NULL, 0); |
| if (n < 0) { |
| lwsl_info("returning that we want to close connection at libwebsocket_rx_flow_control:\n"); |
| return -1; |
| } |
| if (n) |
| /* oh he stuck again, do nothing */ |
| return 0; |
| } |
| |
| if (wsi->u.ws.rxflow_change_to & 1) |
| context->fds[wsi->position_in_fds_table].events |= POLLIN; |
| else |
| context->fds[wsi->position_in_fds_table].events &= ~POLLIN; |
| |
| if (wsi->u.ws.rxflow_change_to & 1) |
| /* external POLL support via protocol 0 */ |
| context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_SET_MODE_POLL_FD, |
| (void *)(long)wsi->sock, NULL, POLLIN); |
| else |
| /* external POLL support via protocol 0 */ |
| context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_CLEAR_MODE_POLL_FD, |
| (void *)(long)wsi->sock, NULL, POLLIN); |
| |
| return 1; |
| } |
| #endif |
| |
| /** |
| * libwebsocket_rx_flow_control() - Enable and disable socket servicing for |
| * receieved packets. |
| * |
| * If the output side of a server process becomes choked, this allows flow |
| * control for the input side. |
| * |
| * @wsi: Websocket connection instance to get callback for |
| * @enable: 0 = disable read servicing for this connection, 1 = enable |
| */ |
| |
| int |
| libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable) |
| { |
| wsi->u.ws.rxflow_change_to = 2 | !!enable; |
| |
| return 0; |
| } |
| |
| |
| /** |
| * libwebsocket_canonical_hostname() - returns this host's hostname |
| * |
| * This is typically used by client code to fill in the host parameter |
| * when making a client connection. You can only call it after the context |
| * has been created. |
| * |
| * @context: Websocket context |
| */ |
| |
| |
| extern const char * |
| libwebsocket_canonical_hostname(struct libwebsocket_context *context) |
| { |
| return (const char *)context->canonical_hostname; |
| } |
| |
| |
| static void sigpipe_handler(int x) |
| { |
| } |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| static int |
| OpenSSL_verify_callback(int preverify_ok, X509_STORE_CTX *x509_ctx) |
| { |
| |
| SSL *ssl; |
| int n; |
| struct libwebsocket_context *context; |
| |
| ssl = X509_STORE_CTX_get_ex_data(x509_ctx, |
| SSL_get_ex_data_X509_STORE_CTX_idx()); |
| |
| /* |
| * !!! nasty openssl requires the index to come as a library-scope |
| * static |
| */ |
| context = SSL_get_ex_data(ssl, openssl_websocket_private_data_index); |
| |
| n = context->protocols[0].callback(NULL, NULL, |
| LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION, |
| x509_ctx, ssl, preverify_ok); |
| |
| /* convert return code from 0 = OK to 1 = OK */ |
| |
| if (!n) |
| n = 1; |
| else |
| n = 0; |
| |
| return n; |
| } |
| #endif |
| |
| int user_callback_handle_rxflow(callback_function callback_function, |
| struct libwebsocket_context * context, |
| struct libwebsocket *wsi, |
| enum libwebsocket_callback_reasons reason, void *user, |
| void *in, size_t len) |
| { |
| int n; |
| |
| n = callback_function(context, wsi, reason, user, in, len); |
| if (!n) |
| n = _libwebsocket_rx_flow_control(wsi); |
| |
| return n; |
| } |
| |
| |
| /** |
| * libwebsocket_create_context() - Create the websocket handler |
| * @info: pointer to struct with parameters |
| * |
| * This function creates the listening socket (if serving) and takes care |
| * of all initialization in one step. |
| * |
| * After initialization, it returns a struct libwebsocket_context * that |
| * represents this server. After calling, user code needs to take care |
| * of calling libwebsocket_service() with the context pointer to get the |
| * server's sockets serviced. This can be done in the same process context |
| * or a forked process, or another thread, |
| * |
| * The protocol callback functions are called for a handful of events |
| * including http requests coming in, websocket connections becoming |
| * established, and data arriving; it's also called periodically to allow |
| * async transmission. |
| * |
| * HTTP requests are sent always to the FIRST protocol in @protocol, since |
| * at that time websocket protocol has not been negotiated. Other |
| * protocols after the first one never see any HTTP callack activity. |
| * |
| * The server created is a simple http server by default; part of the |
| * websocket standard is upgrading this http connection to a websocket one. |
| * |
| * This allows the same server to provide files like scripts and favicon / |
| * images or whatever over http and dynamic data over websockets all in |
| * one place; they're all handled in the user callback. |
| */ |
| |
| struct libwebsocket_context * |
| libwebsocket_create_context(struct lws_context_creation_info *info) |
| { |
| int n; |
| struct libwebsocket_context *context = NULL; |
| char *p; |
| #ifndef LWS_NO_SERVER |
| int opt = 1; |
| struct libwebsocket *wsi; |
| struct sockaddr_in serv_addr; |
| #endif |
| #ifndef LWS_NO_EXTENSIONS |
| int m; |
| struct libwebsocket_extension *ext; |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| SSL_METHOD *method; |
| #endif |
| |
| #ifndef LWS_NO_DAEMONIZE |
| extern int get_daemonize_pid(); |
| int pid_daemon = get_daemonize_pid(); |
| #endif |
| |
| lwsl_notice("Initial logging level %d\n", log_level); |
| lwsl_notice("Library version: %s\n", library_version); |
| lwsl_info(" LWS_MAX_HEADER_NAME_LENGTH: %u\n", LWS_MAX_HEADER_NAME_LENGTH); |
| lwsl_info(" LWS_MAX_HEADER_LEN: %u\n", LWS_MAX_HEADER_LEN); |
| lwsl_info(" LWS_INITIAL_HDR_ALLOC: %u\n", LWS_INITIAL_HDR_ALLOC); |
| lwsl_info(" LWS_ADDITIONAL_HDR_ALLOC: %u\n", LWS_ADDITIONAL_HDR_ALLOC); |
| lwsl_info(" LWS_MAX_PROTOCOLS: %u\n", LWS_MAX_PROTOCOLS); |
| #ifndef LWS_NO_EXTENSIONS |
| lwsl_info(" LWS_MAX_EXTENSIONS_ACTIVE: %u\n", LWS_MAX_EXTENSIONS_ACTIVE); |
| #else |
| lwsl_notice(" Configured without extension support\n"); |
| #endif |
| lwsl_info(" SPEC_LATEST_SUPPORTED: %u\n", SPEC_LATEST_SUPPORTED); |
| lwsl_info(" AWAITING_TIMEOUT: %u\n", AWAITING_TIMEOUT); |
| lwsl_info(" CIPHERS_LIST_STRING: '%s'\n", CIPHERS_LIST_STRING); |
| lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH); |
| lwsl_info(" LWS_MAX_ZLIB_CONN_BUFFER: %u\n", LWS_MAX_ZLIB_CONN_BUFFER); |
| |
| #ifdef _WIN32 |
| { |
| WORD wVersionRequested; |
| WSADATA wsaData; |
| int err; |
| HMODULE wsdll; |
| |
| /* Use the MAKEWORD(lowbyte, highbyte) macro from Windef.h */ |
| wVersionRequested = MAKEWORD(2, 2); |
| |
| err = WSAStartup(wVersionRequested, &wsaData); |
| if (err != 0) { |
| /* Tell the user that we could not find a usable */ |
| /* Winsock DLL. */ |
| lwsl_err("WSAStartup failed with error: %d\n", err); |
| return NULL; |
| } |
| |
| /* default to a poll() made out of select() */ |
| poll = emulated_poll; |
| |
| /* if windows socket lib available, use his WSAPoll */ |
| wsdll = GetModuleHandle(_T("Ws2_32.dll")); |
| if (wsdll) |
| poll = (PFNWSAPOLL)GetProcAddress(wsdll, "WSAPoll"); |
| |
| /* Finally fall back to emulated poll if all else fails */ |
| if (!poll) |
| poll = emulated_poll; |
| } |
| #endif |
| |
| context = (struct libwebsocket_context *) malloc(sizeof(struct libwebsocket_context)); |
| if (!context) { |
| lwsl_err("No memory for websocket context\n"); |
| return NULL; |
| } |
| memset(context, 0, sizeof(*context)); |
| #ifndef LWS_NO_DAEMONIZE |
| context->started_with_parent = pid_daemon; |
| lwsl_notice(" Started with daemon pid %d\n", pid_daemon); |
| #endif |
| |
| context->listen_service_extraseen = 0; |
| context->protocols = info->protocols; |
| context->listen_port = info->port; |
| context->http_proxy_port = 0; |
| context->http_proxy_address[0] = '\0'; |
| context->options = info->options; |
| /* to reduce this allocation, */ |
| context->max_fds = getdtablesize(); |
| lwsl_notice(" max fd tracked: %u\n", context->max_fds); |
| lwsl_notice(" static allocation: %u bytes\n", |
| sizeof(struct libwebsocket_context) + |
| (sizeof(struct pollfd) * context->max_fds) + |
| (sizeof(struct libwebsocket *) * context->max_fds)); |
| |
| context->fds = (struct pollfd *)malloc(sizeof(struct pollfd) * context->max_fds); |
| if (context->fds == NULL) { |
| lwsl_err("Unable to allocate fds array for %d connections\n", context->max_fds); |
| free(context); |
| return NULL; |
| } |
| context->lws_lookup = (struct libwebsocket **)malloc(sizeof(struct libwebsocket *) * context->max_fds); |
| if (context->lws_lookup == NULL) { |
| lwsl_err("Unable to allocate lws_lookup array for %d connections\n", context->max_fds); |
| free(context->fds); |
| free(context); |
| return NULL; |
| } |
| |
| context->fds_count = 0; |
| #ifndef LWS_NO_EXTENSIONS |
| context->extensions = info->extensions; |
| #endif |
| context->last_timeout_check_s = 0; |
| context->user_space = info->user; |
| |
| #ifdef WIN32 |
| context->fd_random = 0; |
| #else |
| context->fd_random = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY); |
| if (context->fd_random < 0) { |
| lwsl_err("Unable to open random device %s %d\n", |
| SYSTEM_RANDOM_FILEPATH, context->fd_random); |
| goto bail; |
| } |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| context->use_ssl = 0; |
| context->ssl_ctx = NULL; |
| context->ssl_client_ctx = NULL; |
| openssl_websocket_private_data_index = 0; |
| #endif |
| |
| strcpy(context->canonical_hostname, "unknown"); |
| |
| #ifndef LWS_NO_SERVER |
| if (!(info->options & LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME)) { |
| struct sockaddr sa; |
| context->service_buffer[0] = '\0'; |
| |
| /* find canonical hostname */ |
| |
| context->service_buffer[(sizeof context->service_buffer) - 1] = '\0'; |
| memset(&sa, 0, sizeof(sa)); |
| sa.sa_family = AF_INET; |
| sa.sa_data[(sizeof sa.sa_data) - 1] = '\0'; |
| gethostname((char *)context->service_buffer, (sizeof context->service_buffer) - 1); |
| |
| n = 0; |
| |
| if (strlen((char *)context->service_buffer) < sizeof(sa.sa_data) - 1) { |
| strcpy(sa.sa_data, (char *)context->service_buffer); |
| lwsl_debug("my host name is %s\n", sa.sa_data); |
| n = getnameinfo(&sa, sizeof(sa), (char *)context->service_buffer, |
| (sizeof context->service_buffer) - 1, NULL, 0, NI_NAMEREQD); |
| } |
| |
| if (!n) { |
| strncpy(context->canonical_hostname, (char *)context->service_buffer, |
| sizeof context->canonical_hostname - 1); |
| context->canonical_hostname[ |
| sizeof context->canonical_hostname - 1] = '\0'; |
| } else |
| strncpy(context->canonical_hostname, (char *)context->service_buffer, |
| sizeof context->canonical_hostname - 1); |
| |
| lwsl_notice(" canonical_hostname = %s\n", context->canonical_hostname); |
| } |
| #endif |
| |
| /* split the proxy ads:port if given */ |
| |
| p = getenv("http_proxy"); |
| if (p) { |
| strncpy(context->http_proxy_address, p, |
| sizeof context->http_proxy_address - 1); |
| context->http_proxy_address[ |
| sizeof context->http_proxy_address - 1] = '\0'; |
| |
| p = strchr(context->http_proxy_address, ':'); |
| if (p == NULL) { |
| lwsl_err("http_proxy needs to be ads:port\n"); |
| goto bail; |
| } |
| *p = '\0'; |
| context->http_proxy_port = atoi(p + 1); |
| |
| lwsl_notice(" Proxy %s:%u\n", |
| context->http_proxy_address, |
| context->http_proxy_port); |
| } |
| |
| #ifndef LWS_NO_SERVER |
| if (info->port) { |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| context->use_ssl = info->ssl_cert_filepath != NULL && |
| info->ssl_private_key_filepath != NULL; |
| #ifdef USE_CYASSL |
| lwsl_notice(" Compiled with CYASSL support\n"); |
| #else |
| lwsl_notice(" Compiled with OpenSSL support\n"); |
| #endif |
| if (context->use_ssl) |
| lwsl_notice(" Using SSL mode\n"); |
| else |
| lwsl_notice(" Using non-SSL mode\n"); |
| |
| #else |
| if (info->ssl_cert_filepath != NULL && |
| info->ssl_private_key_filepath != NULL) { |
| lwsl_notice(" Not compiled for OpenSSl support!\n"); |
| goto bail; |
| } |
| lwsl_notice(" Compiled without SSL support, " |
| "serving unencrypted\n"); |
| #endif |
| |
| lwsl_notice(" per-connection allocation: %u + headers during handshake + frame buffer set by protocol\n", sizeof(struct libwebsocket)); |
| } |
| #endif |
| |
| /* ignore SIGPIPE */ |
| #ifdef WIN32 |
| #else |
| signal(SIGPIPE, sigpipe_handler); |
| #endif |
| |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| |
| /* basic openssl init */ |
| |
| SSL_library_init(); |
| |
| OpenSSL_add_all_algorithms(); |
| SSL_load_error_strings(); |
| |
| openssl_websocket_private_data_index = |
| SSL_get_ex_new_index(0, "libwebsockets", NULL, NULL, NULL); |
| |
| /* |
| * Firefox insists on SSLv23 not SSLv3 |
| * Konq disables SSLv2 by default now, SSLv23 works |
| */ |
| |
| method = (SSL_METHOD *)SSLv23_server_method(); |
| if (!method) { |
| lwsl_err("problem creating ssl method: %s\n", |
| ERR_error_string(ERR_get_error(), (char *)context->service_buffer)); |
| goto bail; |
| } |
| context->ssl_ctx = SSL_CTX_new(method); /* create context */ |
| if (!context->ssl_ctx) { |
| lwsl_err("problem creating ssl context: %s\n", |
| ERR_error_string(ERR_get_error(), (char *)context->service_buffer)); |
| goto bail; |
| } |
| |
| #ifdef SSL_OP_NO_COMPRESSION |
| SSL_CTX_set_options(context->ssl_ctx, SSL_OP_NO_COMPRESSION); |
| #endif |
| SSL_CTX_set_options(context->ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE); |
| SSL_CTX_set_cipher_list(context->ssl_ctx, CIPHERS_LIST_STRING); |
| |
| #ifndef LWS_NO_CLIENT |
| |
| /* client context */ |
| |
| if (info->port == CONTEXT_PORT_NO_LISTEN) { |
| method = (SSL_METHOD *)SSLv23_client_method(); |
| if (!method) { |
| lwsl_err("problem creating ssl method: %s\n", |
| ERR_error_string(ERR_get_error(), (char *)context->service_buffer)); |
| goto bail; |
| } |
| /* create context */ |
| context->ssl_client_ctx = SSL_CTX_new(method); |
| if (!context->ssl_client_ctx) { |
| lwsl_err("problem creating ssl context: %s\n", |
| ERR_error_string(ERR_get_error(), (char *)context->service_buffer)); |
| goto bail; |
| } |
| |
| #ifdef SSL_OP_NO_COMPRESSION |
| SSL_CTX_set_options(context->ssl_client_ctx, SSL_OP_NO_COMPRESSION); |
| #endif |
| SSL_CTX_set_options(context->ssl_client_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE); |
| SSL_CTX_set_cipher_list(context->ssl_client_ctx, CIPHERS_LIST_STRING); |
| |
| /* openssl init for cert verification (for client sockets) */ |
| if (!info->ssl_ca_filepath) { |
| if (!SSL_CTX_load_verify_locations( |
| context->ssl_client_ctx, NULL, |
| LWS_OPENSSL_CLIENT_CERTS)) |
| lwsl_err( |
| "Unable to load SSL Client certs from %s " |
| "(set by --with-client-cert-dir= in configure) -- " |
| " client ssl isn't going to work", |
| LWS_OPENSSL_CLIENT_CERTS); |
| } else |
| if (!SSL_CTX_load_verify_locations( |
| context->ssl_client_ctx, info->ssl_ca_filepath, |
| NULL)) |
| lwsl_err( |
| "Unable to load SSL Client certs " |
| "file from %s -- client ssl isn't " |
| "going to work", info->ssl_ca_filepath); |
| |
| /* |
| * callback allowing user code to load extra verification certs |
| * helping the client to verify server identity |
| */ |
| |
| context->protocols[0].callback(context, NULL, |
| LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS, |
| context->ssl_client_ctx, NULL, 0); |
| } |
| #endif |
| |
| /* as a server, are we requiring clients to identify themselves? */ |
| |
| if (info->options & LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT) { |
| |
| /* absolutely require the client cert */ |
| |
| SSL_CTX_set_verify(context->ssl_ctx, |
| SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, |
| OpenSSL_verify_callback); |
| |
| /* |
| * give user code a chance to load certs into the server |
| * allowing it to verify incoming client certs |
| */ |
| |
| context->protocols[0].callback(context, NULL, |
| LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS, |
| context->ssl_ctx, NULL, 0); |
| } |
| |
| if (context->use_ssl) { |
| |
| /* openssl init for server sockets */ |
| |
| /* set the local certificate from CertFile */ |
| n = SSL_CTX_use_certificate_chain_file(context->ssl_ctx, |
| info->ssl_cert_filepath); |
| if (n != 1) { |
| lwsl_err("problem getting cert '%s': %s\n", |
| info->ssl_cert_filepath, |
| ERR_error_string(ERR_get_error(), (char *)context->service_buffer)); |
| goto bail; |
| } |
| /* set the private key from KeyFile */ |
| if (SSL_CTX_use_PrivateKey_file(context->ssl_ctx, |
| info->ssl_private_key_filepath, |
| SSL_FILETYPE_PEM) != 1) { |
| lwsl_err("ssl problem getting key '%s': %s\n", |
| info->ssl_private_key_filepath, |
| ERR_error_string(ERR_get_error(), (char *)context->service_buffer)); |
| goto bail; |
| } |
| /* verify private key */ |
| if (!SSL_CTX_check_private_key(context->ssl_ctx)) { |
| lwsl_err("Private SSL key doesn't match cert\n"); |
| goto bail; |
| } |
| |
| /* SSL is happy and has a cert it's content with */ |
| } |
| #endif |
| |
| /* selftest */ |
| |
| if (lws_b64_selftest()) |
| goto bail; |
| |
| #ifndef LWS_NO_SERVER |
| /* set up our external listening socket we serve on */ |
| |
| if (info->port) { |
| extern int interface_to_sa(const char *ifname, struct sockaddr_in *addr, size_t addrlen); |
| int sockfd; |
| |
| sockfd = socket(AF_INET, SOCK_STREAM, 0); |
| if (sockfd < 0) { |
| lwsl_err("ERROR opening socket\n"); |
| goto bail; |
| } |
| |
| #ifndef WIN32 |
| /* allow us to restart even if old sockets in TIME_WAIT |
| * (REUSEADDR on Unix means, "don't hang on to this address after the |
| * listener is closed." On Windows, though, it means "don't keep other |
| * processes from binding to this address while we're using it) */ |
| setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, |
| (const void *)&opt, sizeof(opt)); |
| #endif |
| |
| /* Disable Nagle */ |
| opt = 1; |
| setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, |
| (const void *)&opt, sizeof(opt)); |
| |
| #ifdef WIN32 |
| opt = 0; |
| ioctlsocket(sockfd, FIONBIO, (unsigned long *)&opt ); |
| #else |
| fcntl(sockfd, F_SETFL, O_NONBLOCK); |
| #endif |
| |
| bzero((char *) &serv_addr, sizeof(serv_addr)); |
| serv_addr.sin_family = AF_INET; |
| if (info->interface == NULL) |
| serv_addr.sin_addr.s_addr = INADDR_ANY; |
| else |
| interface_to_sa(info->interface, &serv_addr, |
| sizeof(serv_addr)); |
| serv_addr.sin_port = htons(info->port); |
| |
| n = bind(sockfd, (struct sockaddr *) &serv_addr, |
| sizeof(serv_addr)); |
| if (n < 0) { |
| lwsl_err("ERROR on binding to port %d (%d %d)\n", |
| info->port, n, errno); |
| close(sockfd); |
| goto bail; |
| } |
| |
| wsi = (struct libwebsocket *)malloc(sizeof(struct libwebsocket)); |
| if (wsi == NULL) { |
| lwsl_err("Out of mem\n"); |
| close(sockfd); |
| goto bail; |
| } |
| memset(wsi, 0, sizeof (struct libwebsocket)); |
| wsi->sock = sockfd; |
| #ifndef LWS_NO_EXTENSIONS |
| wsi->count_active_extensions = 0; |
| #endif |
| wsi->mode = LWS_CONNMODE_SERVER_LISTENER; |
| |
| insert_wsi_socket_into_fds(context, wsi); |
| |
| context->listen_service_modulo = LWS_LISTEN_SERVICE_MODULO; |
| context->listen_service_count = 0; |
| context->listen_service_fd = sockfd; |
| |
| listen(sockfd, LWS_SOMAXCONN); |
| lwsl_notice(" Listening on port %d\n", info->port); |
| } |
| #endif |
| |
| /* |
| * drop any root privs for this process |
| * to listen on port < 1023 we would have needed root, but now we are |
| * listening, we don't want the power for anything else |
| */ |
| #ifdef WIN32 |
| #else |
| if (info->gid != -1) |
| if (setgid(info->gid)) |
| lwsl_warn("setgid: %s\n", strerror(errno)); |
| if (info->uid != -1) |
| if (setuid(info->uid)) |
| lwsl_warn("setuid: %s\n", strerror(errno)); |
| #endif |
| |
| /* initialize supported protocols */ |
| |
| for (context->count_protocols = 0; |
| info->protocols[context->count_protocols].callback; |
| context->count_protocols++) { |
| |
| lwsl_parser(" Protocol: %s\n", |
| info->protocols[context->count_protocols].name); |
| |
| info->protocols[context->count_protocols].owning_server = |
| context; |
| info->protocols[context->count_protocols].protocol_index = |
| context->count_protocols; |
| } |
| |
| #ifndef LWS_NO_EXTENSIONS |
| /* |
| * give all extensions a chance to create any per-context |
| * allocations they need |
| */ |
| |
| m = LWS_EXT_CALLBACK_CLIENT_CONTEXT_CONSTRUCT; |
| if (info->port) |
| m = LWS_EXT_CALLBACK_SERVER_CONTEXT_CONSTRUCT; |
| |
| if (info->extensions) { |
| ext = info->extensions; |
| while (ext->callback) { |
| lwsl_ext(" Extension: %s\n", ext->name); |
| ext->callback(context, ext, NULL, |
| (enum libwebsocket_extension_callback_reasons)m, |
| NULL, NULL, 0); |
| ext++; |
| } |
| } |
| #endif |
| return context; |
| |
| bail: |
| libwebsocket_context_destroy(context); |
| return NULL; |
| } |
| |
| /** |
| * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket |
| * connection. |
| * @wsi: pointer to struct websocket you want to know the protocol of |
| * |
| * |
| * Some apis can act on all live connections of a given protocol, |
| * this is how you can get a pointer to the active protocol if needed. |
| */ |
| |
| const struct libwebsocket_protocols * |
| libwebsockets_get_protocol(struct libwebsocket *wsi) |
| { |
| return wsi->protocol; |
| } |
| |
| int |
| libwebsocket_is_final_fragment(struct libwebsocket *wsi) |
| { |
| return wsi->u.ws.final; |
| } |
| |
| unsigned char |
| libwebsocket_get_reserved_bits(struct libwebsocket *wsi) |
| { |
| return wsi->u.ws.rsv; |
| } |
| |
| void * |
| libwebsocket_ensure_user_space(struct libwebsocket *wsi) |
| { |
| /* allocate the per-connection user memory (if any) */ |
| |
| if (wsi->protocol->per_session_data_size && !wsi->user_space) { |
| wsi->user_space = malloc( |
| wsi->protocol->per_session_data_size); |
| if (wsi->user_space == NULL) { |
| lwsl_err("Out of memory for conn user space\n"); |
| return NULL; |
| } |
| memset(wsi->user_space, 0, |
| wsi->protocol->per_session_data_size); |
| } |
| return wsi->user_space; |
| } |
| |
| static void lwsl_emit_stderr(int level, const char *line) |
| { |
| char buf[300]; |
| struct timeval tv; |
| int n; |
| |
| gettimeofday(&tv, NULL); |
| |
| buf[0] = '\0'; |
| for (n = 0; n < LLL_COUNT; n++) |
| if (level == (1 << n)) { |
| sprintf(buf, "[%ld:%04d] %s: ", tv.tv_sec, |
| (int)(tv.tv_usec / 100), log_level_names[n]); |
| break; |
| } |
| |
| fprintf(stderr, "%s%s", buf, line); |
| } |
| |
| #ifdef WIN32 |
| void lwsl_emit_syslog(int level, const char *line) |
| { |
| lwsl_emit_stderr(level, line); |
| } |
| #else |
| void lwsl_emit_syslog(int level, const char *line) |
| { |
| int syslog_level = LOG_DEBUG; |
| |
| switch (level) { |
| case LLL_ERR: |
| syslog_level = LOG_ERR; |
| break; |
| case LLL_WARN: |
| syslog_level = LOG_WARNING; |
| break; |
| case LLL_NOTICE: |
| syslog_level = LOG_NOTICE; |
| break; |
| case LLL_INFO: |
| syslog_level = LOG_INFO; |
| break; |
| } |
| syslog(syslog_level, "%s", line); |
| } |
| #endif |
| |
| void _lws_log(int filter, const char *format, ...) |
| { |
| char buf[256]; |
| va_list ap; |
| |
| if (!(log_level & filter)) |
| return; |
| |
| va_start(ap, format); |
| vsnprintf(buf, (sizeof buf), format, ap); |
| buf[(sizeof buf) - 1] = '\0'; |
| va_end(ap); |
| |
| lwsl_emit(filter, buf); |
| } |
| |
| /** |
| * lws_set_log_level() - Set the logging bitfield |
| * @level: OR together the LLL_ debug contexts you want output from |
| * @log_emit_function: NULL to leave it as it is, or a user-supplied |
| * function to perform log string emission instead of |
| * the default stderr one. |
| * |
| * log level defaults to "err" and "warn" contexts enabled only and |
| * emission on stderr. |
| */ |
| |
| void lws_set_log_level(int level, void (*log_emit_function)(int level, const char *line)) |
| { |
| log_level = level; |
| if (log_emit_function) |
| lwsl_emit = log_emit_function; |
| } |