| /* |
| * libwebsockets - small server side websockets and web server implementation |
| * |
| * Copyright (C) 2010-2013 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 <sys/un.h> |
| #include <sys/socket.h> |
| #include <netdb.h> |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| extern int openssl_websocket_private_data_index; |
| #endif |
| |
| int lws_client_socket_service(struct libwebsocket_context *context, struct libwebsocket *wsi, struct pollfd *pollfd) |
| { |
| int n; |
| char pkt[1024]; |
| char *p = &pkt[0]; |
| int len; |
| char c; |
| #ifdef LWS_OPENSSL_SUPPORT |
| char ssl_err_buf[512]; |
| #endif |
| |
| switch (wsi->mode) { |
| |
| case LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY: |
| |
| /* handle proxy hung up on us */ |
| |
| if (pollfd->revents & (POLLERR | POLLHUP)) { |
| |
| lwsl_warn("Proxy connection %p (fd=%d) dead\n", |
| (void *)wsi, pollfd->fd); |
| |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| |
| n = recv(wsi->sock, pkt, sizeof pkt, 0); |
| if (n < 0) { |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| lwsl_err("ERROR reading from proxy socket\n"); |
| return 0; |
| } |
| |
| pkt[13] = '\0'; |
| if (strcmp(pkt, "HTTP/1.0 200 ") != 0) { |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| lwsl_err("ERROR from proxy: %s\n", pkt); |
| return 0; |
| } |
| |
| /* clear his proxy connection timeout */ |
| |
| libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); |
| |
| /* fallthru */ |
| |
| case LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE: |
| |
| /* |
| * we are under PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE |
| * timeout protection set in client-handshake.c |
| */ |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| |
| /* |
| * take care of our libwebsocket_callback_on_writable |
| * happening at a time when there's no real connection yet |
| */ |
| |
| 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); |
| |
| /* we can retry this... so just cook the SSL BIO the first time */ |
| |
| if (wsi->use_ssl && !wsi->ssl) { |
| |
| wsi->ssl = SSL_new(context->ssl_client_ctx); |
| |
| #ifdef USE_CYASSL |
| /* CyaSSL does certificate verification differently from OpenSSL. |
| * If we should ignore the certificate, we need to set this before |
| * SSL_new and SSL_connect is called. Otherwise the connect will |
| * simply fail with error code -155 */ |
| if (wsi->use_ssl == 2) { |
| CyaSSL_set_verify(wsi->ssl, SSL_VERIFY_NONE, NULL); |
| } |
| #endif // USE_CYASSL |
| |
| wsi->client_bio = BIO_new_socket(wsi->sock, BIO_NOCLOSE); |
| |
| SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio); |
| |
| #ifdef USE_CYASSL |
| CyaSSL_set_using_nonblock(wsi->ssl, 1); |
| #else |
| BIO_set_nbio(wsi->client_bio, 1); /* nonblocking */ |
| #endif |
| |
| SSL_set_ex_data(wsi->ssl, |
| openssl_websocket_private_data_index, |
| context); |
| } |
| |
| if (wsi->use_ssl) { |
| lws_latency_pre(context, wsi); |
| n = SSL_connect(wsi->ssl); |
| lws_latency(context, wsi, "SSL_connect LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE", n, n > 0); |
| |
| if (n < 0) { |
| n = SSL_get_error(wsi->ssl, n); |
| |
| if (n == SSL_ERROR_WANT_READ || |
| n == SSL_ERROR_WANT_WRITE) { |
| /* |
| * wants us to retry connect due to state of the |
| * underlying ssl layer... but since it may be |
| * stalled on blocked write, no incoming data may |
| * arrive to trigger the retry. Force (possibly |
| * many if the SSL state persists in returning the |
| * condition code, but other sockets are getting |
| * serviced inbetweentimes) us to get called back |
| * when writable. |
| */ |
| |
| lwsl_info("SSL_connect -> SSL_ERROR_WANT_... retrying\n"); |
| libwebsocket_callback_on_writable(context, wsi); |
| |
| return 0; /* no error */ |
| } |
| n = -1; |
| } |
| |
| if (n <= 0) { |
| /* |
| * retry if new data comes until we |
| * run into the connection timeout or win |
| */ |
| |
| lwsl_err("SSL connect error %s\n", |
| ERR_error_string(ERR_get_error(), |
| ssl_err_buf)); |
| return 0; |
| } |
| |
| #ifndef USE_CYASSL |
| /* See note above about CyaSSL certificate verification */ |
| lws_latency_pre(context, wsi); |
| n = SSL_get_verify_result(wsi->ssl); |
| lws_latency(context, wsi, "SSL_get_verify_result LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE", n, n > 0); |
| if ((n != X509_V_OK) && ( |
| n != X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT || |
| wsi->use_ssl != 2)) { |
| |
| lwsl_err("server's cert didn't " |
| "look good %d\n", n); |
| libwebsocket_close_and_free_session(context, |
| wsi, LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| #endif // USE_CYASSL |
| } else |
| wsi->ssl = NULL; |
| #endif |
| |
| p = libwebsockets_generate_client_handshake(context, wsi, p); |
| if (p == NULL) { |
| lwsl_err("Failed to generate handshake for client, closing it\n"); |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| |
| /* send our request to the server */ |
| |
| lws_latency_pre(context, wsi); |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (wsi->use_ssl) |
| n = SSL_write(wsi->ssl, pkt, p - pkt); |
| else |
| #endif |
| n = send(wsi->sock, pkt, p - pkt, 0); |
| lws_latency(context, wsi, "send or SSL_write LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE", n, n >= 0); |
| |
| if (n < 0) { |
| lwsl_debug("ERROR writing to client socket\n"); |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| } |
| |
| wsi->u.hdr.parser_state = WSI_TOKEN_NAME_PART; |
| wsi->u.hdr.lextable_pos = 0; |
| wsi->mode = LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY; |
| libwebsocket_set_timeout(wsi, |
| PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, AWAITING_TIMEOUT); |
| |
| break; |
| |
| case LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY: |
| |
| /* handle server hung up on us */ |
| |
| if (pollfd->revents & (POLLERR | POLLHUP)) { |
| |
| lwsl_debug("Server connection %p (fd=%d) dead\n", |
| (void *)wsi, pollfd->fd); |
| |
| goto bail3; |
| } |
| |
| if (!(pollfd->revents & POLLIN)) |
| goto bail3; |
| |
| /* interpret the server response */ |
| |
| /* |
| * HTTP/1.1 101 Switching Protocols |
| * Upgrade: websocket |
| * Connection: Upgrade |
| * Sec-WebSocket-Accept: me89jWimTRKTWwrS3aRrL53YZSo= |
| * Sec-WebSocket-Nonce: AQIDBAUGBwgJCgsMDQ4PEC== |
| * Sec-WebSocket-Protocol: chat |
| */ |
| |
| /* |
| * we have to take some care here to only take from the |
| * socket bytewise. The browser may (and has been seen to |
| * in the case that onopen() performs websocket traffic) |
| * coalesce both handshake response and websocket traffic |
| * in one packet, since at that point the connection is |
| * definitively ready from browser pov. |
| */ |
| |
| len = 1; |
| while (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE && len > 0) { |
| #ifdef LWS_OPENSSL_SUPPORT |
| if (wsi->use_ssl) { |
| len = SSL_read(wsi->ssl, &c, 1); |
| if (len < 0) { |
| n = SSL_get_error(wsi->ssl, len); |
| if (n == SSL_ERROR_WANT_READ || |
| n == SSL_ERROR_WANT_WRITE) |
| return 0; |
| } |
| } else |
| #endif |
| len = recv(wsi->sock, &c, 1, 0); |
| |
| if (len < 0) |
| goto bail3; |
| |
| if (libwebsocket_parse(wsi, c)) { |
| /* problems */ |
| goto bail3; |
| } |
| } |
| |
| /* |
| * hs may also be coming in multiple packets, there is a 5-sec |
| * libwebsocket timeout still active here too, so if parsing did |
| * not complete just wait for next packet coming in this state |
| */ |
| |
| if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE) |
| break; |
| |
| /* |
| * otherwise deal with the handshake. If there's any |
| * packet traffic already arrived we'll trigger poll() again |
| * right away and deal with it that way |
| */ |
| |
| return lws_client_interpret_server_handshake(context, wsi); |
| |
| bail3: |
| if (wsi->c_protocol) |
| free(wsi->c_protocol); |
| lwsl_info("closing connection at LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY\n"); |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return 0; |
| |
| case LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT: |
| lwsl_ext("LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT\n"); |
| break; |
| |
| case LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD: |
| lwsl_ext("LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD\n"); |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| |
| /* |
| * In-place str to lower case |
| */ |
| |
| static void |
| strtolower(char *s) |
| { |
| while (*s) { |
| *s = tolower(*s); |
| s++; |
| } |
| } |
| |
| int |
| lws_client_interpret_server_handshake(struct libwebsocket_context *context, |
| struct libwebsocket *wsi) |
| { |
| const char *pc; |
| int okay = 0; |
| #ifndef LWS_NO_EXTENSIONS |
| char ext_name[128]; |
| struct libwebsocket_extension *ext; |
| void *v; |
| int more = 1; |
| const char *c; |
| #endif |
| int n; |
| |
| /* |
| * well, what the server sent looked reasonable for syntax. |
| * Now let's confirm it sent all the necessary headers |
| */ |
| #if 0 |
| lwsl_parser("WSI_TOKEN_HTTP: %d\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_HTTP].token_len); |
| lwsl_parser("WSI_TOKEN_UPGRADE: %d\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_UPGRADE].token_len); |
| lwsl_parser("WSI_TOKEN_CONNECTION: %d\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_CONNECTION].token_len); |
| lwsl_parser("WSI_TOKEN_ACCEPT: %d\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_ACCEPT].token_len); |
| lwsl_parser("WSI_TOKEN_NONCE: %d\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_NONCE].token_len); |
| lwsl_parser("WSI_TOKEN_PROTOCOL: %d\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token_len); |
| #endif |
| |
| strtolower(wsi->u.hdr.hdrs[WSI_TOKEN_HTTP].token); |
| if (strncmp(wsi->u.hdr.hdrs[WSI_TOKEN_HTTP].token, "101", 3)) { |
| lwsl_warn("libwebsocket_client_handshake " |
| "server sent bad HTTP response '%s'\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_HTTP].token); |
| goto bail3; |
| } |
| |
| strtolower(wsi->u.hdr.hdrs[WSI_TOKEN_UPGRADE].token); |
| if (strcmp(wsi->u.hdr.hdrs[WSI_TOKEN_UPGRADE].token, |
| "websocket")) { |
| lwsl_warn("libwebsocket_client_handshake server " |
| "sent bad Upgrade header '%s'\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_UPGRADE].token); |
| goto bail3; |
| } |
| |
| strtolower(wsi->u.hdr.hdrs[WSI_TOKEN_CONNECTION].token); |
| if (strcmp(wsi->u.hdr.hdrs[WSI_TOKEN_CONNECTION].token, |
| "upgrade")) { |
| lwsl_warn("libwebsocket_client_handshake server " |
| "sent bad Connection hdr '%s'\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_CONNECTION].token); |
| goto bail3; |
| } |
| |
| pc = wsi->c_protocol; |
| if (pc == NULL) |
| lwsl_parser("lws_client_interpret_server_handshake: " |
| "NULL c_protocol\n"); |
| else |
| lwsl_parser("lws_client_interpret_server_handshake: " |
| "cPprotocol='%s'\n", pc); |
| |
| /* |
| * confirm the protocol the server wants to talk was in the list |
| * of protocols we offered |
| */ |
| |
| if (!wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token_len) { |
| |
| lwsl_info("lws_client_interpret_server_handshake " |
| "WSI_TOKEN_PROTOCOL is null\n"); |
| /* |
| * no protocol name to work from, |
| * default to first protocol |
| */ |
| wsi->protocol = &context->protocols[0]; |
| wsi->c_callback = wsi->protocol->callback; |
| free(wsi->c_protocol); |
| |
| goto check_extensions; |
| } |
| |
| while (*pc && !okay) { |
| if ((!strncmp(pc, wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token, |
| wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token_len)) && |
| (pc[wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token_len] == ',' || |
| pc[wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token_len] == '\0')) { |
| okay = 1; |
| continue; |
| } |
| while (*pc && *pc != ',') |
| pc++; |
| while (*pc && *pc != ' ') |
| pc++; |
| } |
| |
| /* done with him now */ |
| |
| if (wsi->c_protocol) |
| free(wsi->c_protocol); |
| |
| if (!okay) { |
| lwsl_err("libwebsocket_client_handshake server " |
| "sent bad protocol '%s'\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token); |
| goto bail2; |
| } |
| |
| /* |
| * identify the selected protocol struct and set it |
| */ |
| n = 0; |
| wsi->protocol = NULL; |
| while (context->protocols[n].callback && !wsi->protocol) { /* Stop after finding first one?? */ |
| if (strcmp(wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token, |
| context->protocols[n].name) == 0) { |
| wsi->protocol = &context->protocols[n]; |
| wsi->c_callback = wsi->protocol->callback; |
| } |
| n++; |
| } |
| |
| if (wsi->protocol == NULL) { |
| lwsl_err("libwebsocket_client_handshake server " |
| "requested protocol '%s', which we " |
| "said we supported but we don't!\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_PROTOCOL].token); |
| goto bail2; |
| } |
| |
| |
| check_extensions: |
| #ifndef LWS_NO_EXTENSIONS |
| /* instantiate the accepted extensions */ |
| |
| if (!wsi->u.hdr.hdrs[WSI_TOKEN_EXTENSIONS].token_len) { |
| lwsl_ext("no client extenstions allowed by server\n"); |
| goto check_accept; |
| } |
| |
| /* |
| * break down the list of server accepted extensions |
| * and go through matching them or identifying bogons |
| */ |
| |
| c = wsi->u.hdr.hdrs[WSI_TOKEN_EXTENSIONS].token; |
| n = 0; |
| while (more) { |
| |
| if (*c && (*c != ',' && *c != ' ' && *c != '\t')) { |
| ext_name[n] = *c++; |
| if (n < sizeof(ext_name) - 1) |
| n++; |
| continue; |
| } |
| ext_name[n] = '\0'; |
| if (!*c) |
| more = 0; |
| else { |
| c++; |
| if (!n) |
| continue; |
| } |
| |
| /* check we actually support it */ |
| |
| lwsl_ext("checking client ext %s\n", ext_name); |
| |
| n = 0; |
| ext = wsi->protocol->owning_server->extensions; |
| while (ext && ext->callback) { |
| |
| if (strcmp(ext_name, ext->name)) { |
| ext++; |
| continue; |
| } |
| |
| n = 1; |
| |
| lwsl_ext("instantiating client ext %s\n", ext_name); |
| |
| /* instantiate the extension on this conn */ |
| |
| wsi->active_extensions_user[ |
| wsi->count_active_extensions] = |
| malloc(ext->per_session_data_size); |
| if (wsi->active_extensions_user[ |
| wsi->count_active_extensions] == NULL) { |
| lwsl_err("Out of mem\n"); |
| goto bail2; |
| } |
| memset(wsi->active_extensions_user[ |
| wsi->count_active_extensions], 0, |
| ext->per_session_data_size); |
| wsi->active_extensions[ |
| wsi->count_active_extensions] = ext; |
| |
| /* allow him to construct his context */ |
| |
| ext->callback(wsi->protocol->owning_server, |
| ext, wsi, |
| LWS_EXT_CALLBACK_CLIENT_CONSTRUCT, |
| wsi->active_extensions_user[ |
| wsi->count_active_extensions], |
| NULL, 0); |
| |
| wsi->count_active_extensions++; |
| |
| ext++; |
| } |
| |
| if (n == 0) { |
| lwsl_warn("Server said we should use" |
| "an unknown extension '%s'!\n", ext_name); |
| goto bail2; |
| } |
| |
| n = 0; |
| } |
| |
| check_accept: |
| #endif |
| |
| /* |
| * Confirm his accept token is the one we precomputed |
| */ |
| |
| if (strcmp(wsi->u.hdr.hdrs[WSI_TOKEN_ACCEPT].token, |
| wsi->u.hdr.initial_handshake_hash_base64)) { |
| lwsl_warn("libwebsocket_client_handshake server " |
| "sent bad ACCEPT '%s' vs computed '%s'\n", |
| wsi->u.hdr.hdrs[WSI_TOKEN_ACCEPT].token, |
| wsi->u.hdr.initial_handshake_hash_base64); |
| goto bail2; |
| } |
| |
| /* allocate the per-connection user memory (if any) */ |
| if (wsi->protocol->per_session_data_size && |
| !libwebsocket_ensure_user_space(wsi)) |
| goto bail2; |
| |
| /* |
| * we seem to be good to go, give client last chance to check |
| * headers and OK it |
| */ |
| |
| wsi->protocol->callback(context, wsi, |
| LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH, |
| wsi->user_space, NULL, 0); |
| |
| /* clear his proxy connection timeout */ |
| |
| libwebsocket_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); |
| |
| /* free up his parsing allocations */ |
| |
| for (n = 0; n < WSI_TOKEN_COUNT; n++) |
| if (wsi->u.hdr.hdrs[n].token) |
| free(wsi->u.hdr.hdrs[n].token); |
| |
| /* mark him as being alive */ |
| |
| wsi->state = WSI_STATE_ESTABLISHED; |
| wsi->mode = LWS_CONNMODE_WS_CLIENT; |
| |
| /* union transition */ |
| memset(&wsi->u, 0, sizeof wsi->u); |
| |
| /* |
| * create the frame buffer for this connection according to the |
| * size mentioned in the protocol definition. If 0 there, then |
| * use a big default for compatibility |
| */ |
| |
| n = wsi->protocol->rx_buffer_size; |
| if (!n) |
| n = LWS_MAX_SOCKET_IO_BUF; |
| n += LWS_SEND_BUFFER_PRE_PADDING + LWS_SEND_BUFFER_POST_PADDING; |
| wsi->u.ws.rx_user_buffer = malloc(n); |
| if (!wsi->u.ws.rx_user_buffer) { |
| lwsl_err("Out of Mem allocating rx buffer %d\n", n); |
| goto bail3; |
| } |
| lwsl_info("Allocating client RX buffer %d\n", n); |
| |
| lwsl_debug("handshake OK for protocol %s\n", wsi->protocol->name); |
| |
| /* call him back to inform him he is up */ |
| |
| wsi->protocol->callback(context, wsi, |
| LWS_CALLBACK_CLIENT_ESTABLISHED, |
| wsi->user_space, NULL, 0); |
| #ifndef LWS_NO_EXTENSIONS |
| /* |
| * inform all extensions, not just active ones since they |
| * already know |
| */ |
| |
| ext = context->extensions; |
| |
| while (ext && ext->callback) { |
| v = NULL; |
| for (n = 0; n < wsi->count_active_extensions; n++) |
| if (wsi->active_extensions[n] == ext) |
| v = wsi->active_extensions_user[n]; |
| |
| ext->callback(context, ext, wsi, |
| LWS_EXT_CALLBACK_ANY_WSI_ESTABLISHED, v, NULL, 0); |
| ext++; |
| } |
| #endif |
| |
| return 0; |
| |
| bail3: |
| if (wsi->c_protocol) |
| free(wsi->c_protocol); |
| |
| bail2: |
| if (wsi->c_callback) wsi->c_callback(context, wsi, |
| LWS_CALLBACK_CLIENT_CONNECTION_ERROR, |
| wsi->user_space, |
| NULL, 0); |
| lwsl_info("closing connection due to bail2 connection error\n"); |
| /* free up his parsing allocations */ |
| |
| for (n = 0; n < WSI_TOKEN_COUNT; n++) |
| if (wsi->u.hdr.hdrs[n].token) |
| free(wsi->u.hdr.hdrs[n].token); |
| |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_PROTOCOL_ERR); |
| |
| return 1; |
| } |
| |
| |
| char * |
| libwebsockets_generate_client_handshake(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, char *pkt) |
| { |
| char hash[20]; |
| char key_b64[40]; |
| char *p = pkt; |
| int n; |
| #ifndef LWS_NO_EXTENSIONS |
| struct libwebsocket_extension *ext; |
| struct libwebsocket_extension *ext1; |
| int ext_count = 0; |
| #endif |
| static const char magic_websocket_guid[] = |
| "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; |
| |
| /* |
| * create the random key |
| */ |
| |
| n = libwebsockets_get_random(context, hash, 16); |
| if (n != 16) { |
| lwsl_err("Unable to read from random dev %s\n", |
| SYSTEM_RANDOM_FILEPATH); |
| free(wsi->c_path); |
| free(wsi->c_host); |
| if (wsi->c_origin) |
| free(wsi->c_origin); |
| if (wsi->c_protocol) |
| free(wsi->c_protocol); |
| libwebsocket_close_and_free_session(context, wsi, |
| LWS_CLOSE_STATUS_NOSTATUS); |
| return NULL; |
| } |
| |
| lws_b64_encode_string(hash, 16, key_b64, sizeof key_b64); |
| |
| /* |
| * 00 example client handshake |
| * |
| * GET /socket.io/websocket HTTP/1.1 |
| * Upgrade: WebSocket |
| * Connection: Upgrade |
| * Host: 127.0.0.1:9999 |
| * Origin: http://127.0.0.1 |
| * Sec-WebSocket-Key1: 1 0 2#0W 9 89 7 92 ^ |
| * Sec-WebSocket-Key2: 7 7Y 4328 B2v[8(z1 |
| * Cookie: socketio=websocket |
| * |
| * (Á®Ä0¶†≥ |
| * |
| * 04 example client handshake |
| * |
| * GET /chat HTTP/1.1 |
| * Host: server.example.com |
| * Upgrade: websocket |
| * Connection: Upgrade |
| * Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ== |
| * Sec-WebSocket-Origin: http://example.com |
| * Sec-WebSocket-Protocol: chat, superchat |
| * Sec-WebSocket-Version: 4 |
| */ |
| |
| p += sprintf(p, "GET %s HTTP/1.1\x0d\x0a", wsi->c_path); |
| |
| p += sprintf(p, "Pragma: no-cache\x0d\x0a" |
| "Cache-Control: no-cache\x0d\x0a"); |
| |
| p += sprintf(p, "Host: %s\x0d\x0a", wsi->c_host); |
| p += sprintf(p, "Upgrade: websocket\x0d\x0a" |
| "Connection: Upgrade\x0d\x0a" |
| "Sec-WebSocket-Key: "); |
| strcpy(p, key_b64); |
| p += strlen(key_b64); |
| p += sprintf(p, "\x0d\x0a"); |
| if (wsi->c_origin) { |
| if (wsi->ietf_spec_revision == 13) |
| p += sprintf(p, "Origin: %s\x0d\x0a", wsi->c_origin); |
| else |
| p += sprintf(p, "Sec-WebSocket-Origin: %s\x0d\x0a", |
| wsi->c_origin); |
| } |
| if (wsi->c_protocol) |
| p += sprintf(p, "Sec-WebSocket-Protocol: %s\x0d\x0a", |
| wsi->c_protocol); |
| |
| /* tell the server what extensions we could support */ |
| |
| p += sprintf(p, "Sec-WebSocket-Extensions: "); |
| #ifndef LWS_NO_EXTENSIONS |
| ext = context->extensions; |
| while (ext && ext->callback) { |
| |
| n = 0; |
| ext1 = context->extensions; |
| |
| while (ext1 && ext1->callback) { |
| n |= ext1->callback(context, ext1, wsi, |
| LWS_EXT_CALLBACK_CHECK_OK_TO_PROPOSE_EXTENSION, |
| NULL, (char *)ext->name, 0); |
| |
| ext1++; |
| } |
| |
| if (n) { /* an extension vetos us */ |
| lwsl_ext("ext %s vetoed\n", (char *)ext->name); |
| ext++; |
| continue; |
| } |
| |
| n = context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED, |
| wsi->user_space, (char *)ext->name, 0); |
| |
| /* |
| * zero return from callback means |
| * go ahead and allow the extension, |
| * it's what we get if the callback is |
| * unhandled |
| */ |
| |
| if (n) { |
| ext++; |
| continue; |
| } |
| |
| /* apply it */ |
| |
| if (ext_count) |
| *p++ = ','; |
| p += sprintf(p, "%s", ext->name); |
| ext_count++; |
| |
| ext++; |
| } |
| #endif |
| p += sprintf(p, "\x0d\x0a"); |
| |
| if (wsi->ietf_spec_revision) |
| p += sprintf(p, "Sec-WebSocket-Version: %d\x0d\x0a", |
| wsi->ietf_spec_revision); |
| |
| /* give userland a chance to append, eg, cookies */ |
| |
| context->protocols[0].callback(context, wsi, |
| LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER, |
| NULL, &p, (pkt + sizeof(pkt)) - p - 12); |
| |
| p += sprintf(p, "\x0d\x0a"); |
| |
| /* prepare the expected server accept response */ |
| |
| strcpy((char *)context->service_buffer, key_b64); |
| strcpy((char *)&context->service_buffer[strlen((char *)context->service_buffer)], magic_websocket_guid); |
| |
| SHA1(context->service_buffer, strlen((char *)context->service_buffer), (unsigned char *)hash); |
| |
| lws_b64_encode_string(hash, 20, |
| wsi->u.hdr.initial_handshake_hash_base64, |
| sizeof wsi->u.hdr.initial_handshake_hash_base64); |
| |
| /* done with these now */ |
| |
| free(wsi->c_path); |
| free(wsi->c_host); |
| if (wsi->c_origin) |
| free(wsi->c_origin); |
| |
| return p; |
| } |
| |