/* * libwebsockets - lib/client/client.c * * Copyright (C) 2010-2018 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 "core/private.h" LWS_VISIBLE LWS_EXTERN void lws_client_http_body_pending(struct lws *wsi, int something_left_to_send) { wsi->client_http_body_pending = !!something_left_to_send; } /* * return self, or queued client wsi we are acting on behalf of * * That is the TAIL of the queue (new queue elements are added at the HEAD) */ struct lws * lws_client_wsi_effective(struct lws *wsi) { struct lws_dll_lws *tail = NULL; if (!wsi->transaction_from_pipeline_queue || !wsi->dll_client_transaction_queue_head.next) return wsi; lws_start_foreach_dll_safe(struct lws_dll_lws *, d, d1, wsi->dll_client_transaction_queue_head.next) { tail = d; } lws_end_foreach_dll_safe(d, d1); return lws_container_of(tail, struct lws, dll_client_transaction_queue); } /* * return self or the guy we are queued under * * REQUIRES VHOST LOCK HELD */ static struct lws * _lws_client_wsi_master(struct lws *wsi) { struct lws *wsi_eff = wsi; struct lws_dll_lws *d; d = wsi->dll_client_transaction_queue.prev; while (d) { wsi_eff = lws_container_of(d, struct lws, dll_client_transaction_queue_head); d = d->prev; } return wsi_eff; } int lws_client_socket_service(struct lws *wsi, struct lws_pollfd *pollfd, struct lws *wsi_conn) { struct lws_context *context = wsi->context; struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi]; char *p = (char *)&pt->serv_buf[0]; struct lws *w; #if defined(LWS_WITH_TLS) char ebuf[128]; #endif const char *cce = NULL; #if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2) ssize_t len = 0; unsigned char c; #endif char *sb = p; int n = 0; #if defined(LWS_WITH_SOCKS5) int conn_mode = 0, pending_timeout = 0; #endif if ((pollfd->revents & LWS_POLLOUT) && wsi->keepalive_active && wsi->dll_client_transaction_queue_head.next) { struct lws *wfound = NULL; lwsl_debug("%s: pollout HANDSHAKE2\n", __func__); /* * We have a transaction queued that wants to pipeline. * * We have to allow it to send headers strictly in the order * that it was queued, ie, tail-first. */ lws_vhost_lock(wsi->vhost); lws_start_foreach_dll_safe(struct lws_dll_lws *, d, d1, wsi->dll_client_transaction_queue_head.next) { struct lws *w = lws_container_of(d, struct lws, dll_client_transaction_queue); lwsl_debug("%s: %p states 0x%x\n", __func__, w, w->wsistate); if (lwsi_state(w) == LRS_H1C_ISSUE_HANDSHAKE2) wfound = w; } lws_end_foreach_dll_safe(d, d1); if (wfound) { /* * pollfd has the master sockfd in it... we * need to use that in HANDSHAKE2 to understand * which wsi to actually write on */ lws_client_socket_service(wfound, pollfd, wsi); lws_callback_on_writable(wsi); } else lwsl_debug("%s: didn't find anything in txn q in HS2\n", __func__); lws_vhost_unlock(wsi->vhost); return 0; } switch (lwsi_state(wsi)) { case LRS_WAITING_CONNECT: /* * we are under PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE * timeout protection set in client-handshake.c */ if (!lws_client_connect_2(wsi)) { /* closed */ lwsl_client("closed\n"); return -1; } /* either still pending connection, or changed mode */ return 0; #if defined(LWS_WITH_SOCKS5) /* SOCKS Greeting Reply */ case LRS_WAITING_SOCKS_GREETING_REPLY: case LRS_WAITING_SOCKS_AUTH_REPLY: case LRS_WAITING_SOCKS_CONNECT_REPLY: /* handle proxy hung up on us */ if (pollfd->revents & LWS_POLLHUP) { lwsl_warn("SOCKS connection %p (fd=%d) dead\n", (void *)wsi, pollfd->fd); goto bail3; } n = recv(wsi->desc.sockfd, sb, context->pt_serv_buf_size, 0); if (n < 0) { if (LWS_ERRNO == LWS_EAGAIN) { lwsl_debug("SOCKS read EAGAIN, retrying\n"); return 0; } lwsl_err("ERROR reading from SOCKS socket\n"); goto bail3; } switch (lwsi_state(wsi)) { case LRS_WAITING_SOCKS_GREETING_REPLY: if (pt->serv_buf[0] != SOCKS_VERSION_5) goto socks_reply_fail; if (pt->serv_buf[1] == SOCKS_AUTH_NO_AUTH) { lwsl_client("SOCKS GR: No Auth Method\n"); socks_generate_msg(wsi, SOCKS_MSG_CONNECT, &len); conn_mode = LRS_WAITING_SOCKS_CONNECT_REPLY; pending_timeout = PENDING_TIMEOUT_AWAITING_SOCKS_CONNECT_REPLY; goto socks_send; } if (pt->serv_buf[1] == SOCKS_AUTH_USERNAME_PASSWORD) { lwsl_client("SOCKS GR: User/Pw Method\n"); socks_generate_msg(wsi, SOCKS_MSG_USERNAME_PASSWORD, &len); conn_mode = LRS_WAITING_SOCKS_AUTH_REPLY; pending_timeout = PENDING_TIMEOUT_AWAITING_SOCKS_AUTH_REPLY; goto socks_send; } goto socks_reply_fail; case LRS_WAITING_SOCKS_AUTH_REPLY: if (pt->serv_buf[0] != SOCKS_SUBNEGOTIATION_VERSION_1 || pt->serv_buf[1] != SOCKS_SUBNEGOTIATION_STATUS_SUCCESS) goto socks_reply_fail; lwsl_client("SOCKS password OK, sending connect\n"); socks_generate_msg(wsi, SOCKS_MSG_CONNECT, &len); conn_mode = LRS_WAITING_SOCKS_CONNECT_REPLY; pending_timeout = PENDING_TIMEOUT_AWAITING_SOCKS_CONNECT_REPLY; socks_send: n = send(wsi->desc.sockfd, (char *)pt->serv_buf, len, MSG_NOSIGNAL); if (n < 0) { lwsl_debug("ERROR writing to socks proxy\n"); goto bail3; } lws_set_timeout(wsi, pending_timeout, AWAITING_TIMEOUT); lwsi_set_state(wsi, conn_mode); break; socks_reply_fail: lwsl_notice("socks reply: v%d, err %d\n", pt->serv_buf[0], pt->serv_buf[1]); goto bail3; case LRS_WAITING_SOCKS_CONNECT_REPLY: if (pt->serv_buf[0] != SOCKS_VERSION_5 || pt->serv_buf[1] != SOCKS_REQUEST_REPLY_SUCCESS) goto socks_reply_fail; lwsl_client("socks connect OK\n"); /* free stash since we are done with it */ lws_client_stash_destroy(wsi); if (lws_hdr_simple_create(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS, wsi->vhost->socks_proxy_address)) goto bail3; wsi->c_port = wsi->vhost->socks_proxy_port; /* clear his proxy connection timeout */ lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); goto start_ws_handshake; default: break; } break; #endif case LRS_WAITING_PROXY_REPLY: /* handle proxy hung up on us */ if (pollfd->revents & LWS_POLLHUP) { lwsl_warn("Proxy connection %p (fd=%d) dead\n", (void *)wsi, pollfd->fd); goto bail3; } n = recv(wsi->desc.sockfd, sb, context->pt_serv_buf_size, 0); if (n < 0) { if (LWS_ERRNO == LWS_EAGAIN) { lwsl_debug("Proxy read EAGAIN... retrying\n"); return 0; } lwsl_err("ERROR reading from proxy socket\n"); goto bail3; } pt->serv_buf[13] = '\0'; if (strcmp(sb, "HTTP/1.0 200 ") && strcmp(sb, "HTTP/1.1 200 ")) { lwsl_err("ERROR proxy: %s\n", sb); goto bail3; } /* clear his proxy connection timeout */ lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); /* fallthru */ case LRS_H1C_ISSUE_HANDSHAKE: /* * we are under PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE * timeout protection set in client-handshake.c * * take care of our lws_callback_on_writable * happening at a time when there's no real connection yet */ #if defined(LWS_WITH_SOCKS5) start_ws_handshake: #endif if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) return -1; #if defined(LWS_WITH_TLS) /* we can retry this... just cook the SSL BIO the first time */ if ((wsi->tls.use_ssl & LCCSCF_USE_SSL) && !wsi->tls.ssl && lws_ssl_client_bio_create(wsi) < 0) { cce = "bio_create failed"; goto bail3; } if (wsi->tls.use_ssl & LCCSCF_USE_SSL) { n = lws_ssl_client_connect1(wsi); if (!n) return 0; if (n < 0) { cce = "lws_ssl_client_connect1 failed"; goto bail3; } } else wsi->tls.ssl = NULL; /* fallthru */ case LRS_WAITING_SSL: if (wsi->tls.use_ssl & LCCSCF_USE_SSL) { n = lws_ssl_client_connect2(wsi, ebuf, sizeof(ebuf)); if (!n) return 0; if (n < 0) { cce = ebuf; goto bail3; } } else wsi->tls.ssl = NULL; #endif #if defined (LWS_WITH_HTTP2) if (wsi->client_h2_alpn) { /* * We connected to the server and set up tls, and * negotiated "h2". * * So this is it, we are an h2 master client connection * now, not an h1 client connection. */ #if defined (LWS_WITH_TLS) lws_tls_server_conn_alpn(wsi); #endif /* send the H2 preface to legitimize the connection */ if (lws_h2_issue_preface(wsi)) { cce = "error sending h2 preface"; goto bail3; } break; } #endif lwsi_set_state(wsi, LRS_H1C_ISSUE_HANDSHAKE2); lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND, context->timeout_secs); /* fallthru */ case LRS_H1C_ISSUE_HANDSHAKE2: p = lws_generate_client_handshake(wsi, p); if (p == NULL) { if (wsi->role_ops == &role_ops_raw_skt || wsi->role_ops == &role_ops_raw_file) return 0; lwsl_err("Failed to generate handshake for client\n"); lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "chs"); return 0; } /* send our request to the server */ lws_latency_pre(context, wsi); w = _lws_client_wsi_master(wsi); lwsl_info("%s: HANDSHAKE2: %p: sending headers on %p " "(wsistate 0x%x 0x%x)\n", __func__, wsi, w, wsi->wsistate, w->wsistate); n = lws_ssl_capable_write(w, (unsigned char *)sb, (int)(p - sb)); lws_latency(context, wsi, "send lws_issue_raw", n, n == p - sb); switch (n) { case LWS_SSL_CAPABLE_ERROR: lwsl_debug("ERROR writing to client socket\n"); lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "cws"); return 0; case LWS_SSL_CAPABLE_MORE_SERVICE: lws_callback_on_writable(wsi); break; } if (wsi->client_http_body_pending) { lwsi_set_state(wsi, LRS_ISSUE_HTTP_BODY); lws_set_timeout(wsi, PENDING_TIMEOUT_CLIENT_ISSUE_PAYLOAD, context->timeout_secs); /* user code must ask for writable callback */ break; } lwsi_set_state(wsi, LRS_WAITING_SERVER_REPLY); wsi->hdr_parsing_completed = 0; if (lwsi_state(w) == LRS_IDLING) { lwsi_set_state(w, LRS_WAITING_SERVER_REPLY); w->hdr_parsing_completed = 0; #if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2) w->http.ah->parser_state = WSI_TOKEN_NAME_PART; w->http.ah->lextable_pos = 0; /* If we're (re)starting on hdr, need other implied init */ wsi->http.ah->ues = URIES_IDLE; #endif } lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, wsi->context->timeout_secs); lws_callback_on_writable(w); goto client_http_body_sent; case LRS_ISSUE_HTTP_BODY: if (wsi->client_http_body_pending) { //lws_set_timeout(wsi, // PENDING_TIMEOUT_CLIENT_ISSUE_PAYLOAD, // context->timeout_secs); /* user code must ask for writable callback */ break; } client_http_body_sent: #if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2) /* prepare ourselves to do the parsing */ wsi->http.ah->parser_state = WSI_TOKEN_NAME_PART; wsi->http.ah->lextable_pos = 0; #endif lwsi_set_state(wsi, LRS_WAITING_SERVER_REPLY); lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, context->timeout_secs); break; case LRS_WAITING_SERVER_REPLY: /* * handle server hanging up on us... * but if there is POLLIN waiting, handle that first */ if ((pollfd->revents & (LWS_POLLIN | LWS_POLLHUP)) == LWS_POLLHUP) { lwsl_debug("Server connection %p (fd=%d) dead\n", (void *)wsi, pollfd->fd); cce = "Peer hung up"; goto bail3; } if (!(pollfd->revents & LWS_POLLIN)) break; #if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2) /* 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->http.ah->parser_state != WSI_PARSING_COMPLETE && len > 0) { int plen = 1; n = lws_ssl_capable_read(wsi, &c, 1); lws_latency(context, wsi, "send lws_issue_raw", n, n == 1); switch (n) { case 0: case LWS_SSL_CAPABLE_ERROR: cce = "read failed"; goto bail3; case LWS_SSL_CAPABLE_MORE_SERVICE: return 0; } if (lws_parse(wsi, &c, &plen)) { lwsl_warn("problems parsing header\n"); 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->http.ah->parser_state != WSI_PARSING_COMPLETE) break; #endif /* * 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(wsi); bail3: lwsl_info("closing conn at LWS_CONNMODE...SERVER_REPLY\n"); if (cce) lwsl_info("reason: %s\n", cce); wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_CONNECTION_ERROR, wsi->user_space, (void *)cce, cce ? strlen(cce) : 0); wsi->already_did_cce = 1; lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS, "cbail3"); return -1; default: break; } return 0; } #if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2) int LWS_WARN_UNUSED_RESULT lws_http_transaction_completed_client(struct lws *wsi) { struct lws *wsi_eff = lws_client_wsi_effective(wsi); lwsl_info("%s: wsi: %p, wsi_eff: %p (%s)\n", __func__, wsi, wsi_eff, wsi_eff->protocol->name); if (user_callback_handle_rxflow(wsi_eff->protocol->callback, wsi_eff, LWS_CALLBACK_COMPLETED_CLIENT_HTTP, wsi_eff->user_space, NULL, 0)) { lwsl_debug("%s: Completed call returned nonzero (role 0x%x)\n", __func__, lwsi_role(wsi_eff)); return -1; } /* * Are we constitutionally capable of having a queue, ie, we are on * the "active client connections" list? * * If not, that's it for us. */ if (lws_dll_is_null(&wsi->dll_active_client_conns)) return -1; /* if this was a queued guy, close him and remove from queue */ if (wsi->transaction_from_pipeline_queue) { lwsl_debug("closing queued wsi %p\n", wsi_eff); /* so the close doesn't trigger a CCE */ wsi_eff->already_did_cce = 1; __lws_close_free_wsi(wsi_eff, LWS_CLOSE_STATUS_CLIENT_TRANSACTION_DONE, "queued client done"); } _lws_header_table_reset(wsi->http.ah); /* after the first one, they can only be coming from the queue */ wsi->transaction_from_pipeline_queue = 1; wsi->http.rx_content_length = 0; wsi->hdr_parsing_completed = 0; /* is there a new tail after removing that one? */ wsi_eff = lws_client_wsi_effective(wsi); /* * Do we have something pipelined waiting? * it's OK if he hasn't managed to send his headers yet... he's next * in line to do that... */ if (wsi_eff == wsi) { /* * Nothing pipelined... we should hang around a bit * in case something turns up... */ lwsl_info("%s: nothing pipelined waiting\n", __func__); lwsi_set_state(wsi, LRS_IDLING); lws_set_timeout(wsi, PENDING_TIMEOUT_CLIENT_CONN_IDLE, 5); return 0; } /* * H1: we can serialize the queued guys into the same ah * H2: everybody needs their own ah until their own STREAM_END */ /* otherwise set ourselves up ready to go again */ lwsi_set_state(wsi, LRS_WAITING_SERVER_REPLY); wsi->http.ah->parser_state = WSI_TOKEN_NAME_PART; wsi->http.ah->lextable_pos = 0; lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, wsi->context->timeout_secs); /* If we're (re)starting on headers, need other implied init */ wsi->http.ah->ues = URIES_IDLE; lwsl_info("%s: %p: new queued transaction as %p\n", __func__, wsi, wsi_eff); lws_callback_on_writable(wsi); return 0; } LWS_VISIBLE LWS_EXTERN unsigned int lws_http_client_http_response(struct lws *_wsi) { struct lws *wsi; unsigned int resp; if (_wsi->http.ah && _wsi->http.ah->http_response) return _wsi->http.ah->http_response; lws_vhost_lock(_wsi->vhost); wsi = _lws_client_wsi_master(_wsi); resp = wsi->http.ah->http_response; lws_vhost_unlock(_wsi->vhost); return resp; } #endif #if defined(LWS_PLAT_OPTEE) char * strrchr(const char *s, int c) { char *hit = NULL; while (*s) if (*(s++) == (char)c) hit = (char *)s - 1; return hit; } #define atoll atoi #endif #if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2) int lws_client_interpret_server_handshake(struct lws *wsi) { int n, port = 0, ssl = 0; int close_reason = LWS_CLOSE_STATUS_PROTOCOL_ERR; const char *prot, *ads = NULL, *path, *cce = NULL; struct allocated_headers *ah; struct lws *w = lws_client_wsi_effective(wsi); char *p, *q; char new_path[300]; lws_client_stash_destroy(wsi); ah = wsi->http.ah; if (!wsi->do_ws) { /* we are being an http client... */ #if defined(LWS_ROLE_H2) if (wsi->client_h2_alpn || wsi->client_h2_substream) { lwsl_debug("%s: %p: transitioning to h2 client\n", __func__, wsi); lws_role_transition(wsi, LWSIFR_CLIENT, LRS_ESTABLISHED, &role_ops_h2); } else #endif { #if defined(LWS_ROLE_H1) { lwsl_debug("%s: %p: transitioning to h1 client\n", __func__, wsi); lws_role_transition(wsi, LWSIFR_CLIENT, LRS_ESTABLISHED, &role_ops_h1); } #else return -1; #endif } wsi->http.ah = ah; ah->http_response = 0; } /* * well, what the server sent looked reasonable for syntax. * Now let's confirm it sent all the necessary headers * * http (non-ws) client will expect something like this * * HTTP/1.0.200 * server:.libwebsockets * content-type:.text/html * content-length:.17703 * set-cookie:.test=LWS_1456736240_336776_COOKIE;Max-Age=360000 */ wsi->http.conn_type = HTTP_CONNECTION_KEEP_ALIVE; if (!wsi->client_h2_substream) { p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP); if (wsi->do_ws && !p) { lwsl_info("no URI\n"); cce = "HS: URI missing"; goto bail3; } if (!p) { p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP1_0); wsi->http.conn_type = HTTP_CONNECTION_CLOSE; } if (!p) { cce = "HS: URI missing"; lwsl_info("no URI\n"); goto bail3; } } else { p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_COLON_STATUS); if (!p) { cce = "HS: :status missing"; lwsl_info("no status\n"); goto bail3; } } n = atoi(p); if (ah) ah->http_response = n; if (n == 301 || n == 302 || n == 303 || n == 307 || n == 308) { p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_LOCATION); if (!p) { cce = "HS: Redirect code but no Location"; goto bail3; } /* Relative reference absolute path */ if (p[0] == '/') { #if defined(LWS_WITH_TLS) ssl = wsi->tls.use_ssl & LCCSCF_USE_SSL; #endif ads = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS); port = wsi->c_port; /* +1 as lws_client_reset expects leading / omitted */ path = p + 1; } /* Absolute (Full) URI */ else if (strchr(p, ':')) { if (lws_parse_uri(p, &prot, &ads, &port, &path)) { cce = "HS: URI did not parse"; goto bail3; } if (!strcmp(prot, "wss") || !strcmp(prot, "https")) ssl = 1; } /* Relative reference relative path */ else { /* This doesn't try to calculate an absolute path, * that will be left to the server */ #if defined(LWS_WITH_TLS) ssl = wsi->tls.use_ssl & LCCSCF_USE_SSL; #endif ads = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS); port = wsi->c_port; /* +1 as lws_client_reset expects leading / omitted */ path = new_path + 1; lws_strncpy(new_path, lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_URI), sizeof(new_path)); q = strrchr(new_path, '/'); if (q) lws_strncpy(q + 1, p, sizeof(new_path) - (q - new_path) - 1); else path = p; } #if defined(LWS_WITH_TLS) if ((wsi->tls.use_ssl & LCCSCF_USE_SSL) && !ssl) { cce = "HS: Redirect attempted SSL downgrade"; goto bail3; } #endif if (!lws_client_reset(&wsi, ssl, ads, port, path, ads)) { /* there are two ways to fail out with NULL return... * simple, early problem where the wsi is intact, or * we went through with the reconnect attempt and the * wsi is already closed. In the latter case, the wsi * has beet set to NULL additionally. */ lwsl_err("Redirect failed\n"); cce = "HS: Redirect failed"; if (wsi) goto bail3; return 1; } return 0; } if (!wsi->do_ws) { /* if h1 KA is allowed, enable the queued pipeline guys */ if (!wsi->client_h2_alpn && !wsi->client_h2_substream && w == wsi) { /* ie, coming to this for the first time */ if (wsi->http.conn_type == HTTP_CONNECTION_KEEP_ALIVE) wsi->keepalive_active = 1; else { /* * Ugh... now the main http connection has seen * both sides, we learn the server doesn't * support keepalive. * * That means any guys queued on us are going * to have to be restarted from connect2 with * their own connections. */ /* * stick around telling any new guys they can't * pipeline to this server */ wsi->keepalive_rejected = 1; lws_vhost_lock(wsi->vhost); lws_start_foreach_dll_safe(struct lws_dll_lws *, d, d1, wsi->dll_client_transaction_queue_head.next) { struct lws *ww = lws_container_of(d, struct lws, dll_client_transaction_queue); /* remove him from our queue */ lws_dll_lws_remove( &ww->dll_client_transaction_queue); /* give up on pipelining */ ww->client_pipeline = 0; /* go back to "trying to connect" state */ lws_role_transition(ww, LWSIFR_CLIENT, LRS_UNCONNECTED, #if defined(LWS_ROLE_H1) &role_ops_h1); #else #if defined (LWS_ROLE_H2) &role_ops_h2); #else &role_ops_raw); #endif #endif ww->user_space = NULL; } lws_end_foreach_dll_safe(d, d1); lws_vhost_unlock(wsi->vhost); } } #ifdef LWS_WITH_HTTP_PROXY wsi->http.perform_rewrite = 0; if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE)) { if (!strncmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE), "text/html", 9)) wsi->http.perform_rewrite = 0; } #endif /* allocate the per-connection user memory (if any) */ if (lws_ensure_user_space(wsi)) { lwsl_err("Problem allocating wsi user mem\n"); cce = "HS: OOM"; goto bail2; } /* he may choose to send us stuff in chunked transfer-coding */ wsi->chunked = 0; wsi->chunk_remaining = 0; /* ie, next thing is chunk size */ if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_TRANSFER_ENCODING)) { wsi->chunked = !strcmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_TRANSFER_ENCODING), "chunked"); /* first thing is hex, after payload there is crlf */ wsi->chunk_parser = ELCP_HEX; } if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) { wsi->http.rx_content_length = atoll(lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)); lwsl_info("%s: incoming content length %llu\n", __func__, (unsigned long long) wsi->http.rx_content_length); wsi->http.rx_content_remain = wsi->http.rx_content_length; } else /* can't do 1.1 without a content length or chunked */ if (!wsi->chunked) wsi->http.conn_type = HTTP_CONNECTION_CLOSE; /* * we seem to be good to go, give client last chance to check * headers and OK it */ if (w->protocol->callback(w, LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH, w->user_space, NULL, 0)) { cce = "HS: disallowed by client filter"; goto bail2; } /* clear his proxy connection timeout */ lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); wsi->rxflow_change_to = LWS_RXFLOW_ALLOW; /* call him back to inform him he is up */ if (w->protocol->callback(w, LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP, w->user_space, NULL, 0)) { cce = "HS: disallowed at ESTABLISHED"; goto bail3; } /* * for pipelining, master needs to keep his ah... guys who * queued on him can drop it now though. */ if (w != wsi) /* free up parsing allocations for queued guy */ lws_header_table_detach(w, 0); lwsl_info("%s: client connection up\n", __func__); /* * Did we get a response from the server with an explicit * content-length of zero? If so, this transaction is already * completed at the end of the header processing... */ if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH) && !wsi->http.rx_content_length) return !!lws_http_transaction_completed_client(wsi); return 0; } #if defined(LWS_ROLE_WS) switch (lws_client_ws_upgrade(wsi, &cce)) { case 2: goto bail2; case 3: goto bail3; } return 0; #endif bail3: close_reason = LWS_CLOSE_STATUS_NOSTATUS; bail2: if (wsi->protocol) { n = 0; if (cce) n = (int)strlen(cce); w->protocol->callback(w, LWS_CALLBACK_CLIENT_CONNECTION_ERROR, w->user_space, (void *)cce, (unsigned int)n); } wsi->already_did_cce = 1; lwsl_info("closing connection (prot %s) " "due to bail2 connection error: %s\n", wsi->protocol ? wsi->protocol->name : "unknown", cce); /* closing will free up his parsing allocations */ lws_close_free_wsi(wsi, close_reason, "c hs interp"); return 1; } #endif char * lws_generate_client_handshake(struct lws *wsi, char *pkt) { char *p = pkt; const char *meth; const char *pp = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_SENT_PROTOCOLS); meth = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_METHOD); if (!meth) { meth = "GET"; wsi->do_ws = 1; } else { wsi->do_ws = 0; } if (!strcmp(meth, "RAW")) { lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0); lwsl_notice("client transition to raw\n"); if (pp) { const struct lws_protocols *pr; pr = lws_vhost_name_to_protocol(wsi->vhost, pp); if (!pr) { lwsl_err("protocol %s not enabled on vhost\n", pp); return NULL; } lws_bind_protocol(wsi, pr, __func__); } if ((wsi->protocol->callback)(wsi, LWS_CALLBACK_RAW_ADOPT, wsi->user_space, NULL, 0)) return NULL; lws_role_transition(wsi, 0, LRS_ESTABLISHED, &role_ops_raw_skt); lws_header_table_detach(wsi, 1); return NULL; } /* * 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, "%s %s HTTP/1.1\x0d\x0a", meth, lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_URI)); p += sprintf(p, "Pragma: no-cache\x0d\x0a" "Cache-Control: no-cache\x0d\x0a"); p += sprintf(p, "Host: %s\x0d\x0a", lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_HOST)); if (lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_ORIGIN)) { if (lws_check_opt(wsi->context->options, LWS_SERVER_OPTION_JUST_USE_RAW_ORIGIN)) p += sprintf(p, "Origin: %s\x0d\x0a", lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_ORIGIN)); else p += sprintf(p, "Origin: http://%s\x0d\x0a", lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_ORIGIN)); } #if defined(LWS_ROLE_WS) if (wsi->do_ws) { const char *conn1 = ""; if (!wsi->client_pipeline) conn1 = "close, "; p = lws_generate_client_ws_handshake(wsi, p, conn1); } else #endif if (!wsi->client_pipeline) p += sprintf(p, "connection: close\x0d\x0a"); /* give userland a chance to append, eg, cookies */ if (wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER, wsi->user_space, &p, (pkt + wsi->context->pt_serv_buf_size) - p - 12)) return NULL; p += sprintf(p, "\x0d\x0a"); return p; } #if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2) LWS_VISIBLE int lws_http_client_read(struct lws *wsi, char **buf, int *len) { int rlen, n; rlen = lws_ssl_capable_read(wsi, (unsigned char *)*buf, *len); *len = 0; // lwsl_notice("%s: rlen %d\n", __func__, rlen); /* allow the source to signal he has data again next time */ lws_change_pollfd(wsi, 0, LWS_POLLIN); if (rlen == LWS_SSL_CAPABLE_ERROR) { lwsl_debug("%s: SSL capable error\n", __func__); return -1; } if (rlen <= 0) return 0; *len = rlen; wsi->client_rx_avail = 0; /* * server may insist on transfer-encoding: chunked, * so http client must deal with it */ spin_chunks: while (wsi->chunked && (wsi->chunk_parser != ELCP_CONTENT) && *len) { switch (wsi->chunk_parser) { case ELCP_HEX: if ((*buf)[0] == '\x0d') { wsi->chunk_parser = ELCP_CR; break; } n = char_to_hex((*buf)[0]); if (n < 0) { lwsl_info("%s: chunking failure\n", __func__); return -1; } wsi->chunk_remaining <<= 4; wsi->chunk_remaining |= n; break; case ELCP_CR: if ((*buf)[0] != '\x0a') { lwsl_info("%s: chunking failure\n", __func__); return -1; } wsi->chunk_parser = ELCP_CONTENT; lwsl_info("chunk %d\n", wsi->chunk_remaining); if (wsi->chunk_remaining) break; lwsl_info("final chunk\n"); goto completed; case ELCP_CONTENT: break; case ELCP_POST_CR: if ((*buf)[0] != '\x0d') { lwsl_info("%s: chunking failure\n", __func__); return -1; } wsi->chunk_parser = ELCP_POST_LF; break; case ELCP_POST_LF: if ((*buf)[0] != '\x0a') { lwsl_info("%s: chunking failure\n", __func__); return -1; } wsi->chunk_parser = ELCP_HEX; wsi->chunk_remaining = 0; break; } (*buf)++; (*len)--; } if (wsi->chunked && !wsi->chunk_remaining) return 0; if (wsi->http.rx_content_remain && wsi->http.rx_content_remain < (unsigned int)*len) n = (int)wsi->http.rx_content_remain; else n = *len; if (wsi->chunked && wsi->chunk_remaining && wsi->chunk_remaining < n) n = wsi->chunk_remaining; #if defined(LWS_WITH_HTTP_PROXY) && defined(LWS_WITH_HUBBUB) /* hubbub */ if (wsi->http.perform_rewrite) lws_rewrite_parse(wsi->http.rw, (unsigned char *)*buf, n); else #endif { struct lws *wsi_eff = lws_client_wsi_effective(wsi); if (user_callback_handle_rxflow(wsi_eff->protocol->callback, wsi_eff, LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ, wsi_eff->user_space, *buf, n)) { lwsl_info("%s: RECEIVE_CLIENT_HTTP_READ returned -1\n", __func__); return -1; } } if (wsi->chunked && wsi->chunk_remaining) { (*buf) += n; wsi->chunk_remaining -= n; *len -= n; } if (wsi->chunked && !wsi->chunk_remaining) wsi->chunk_parser = ELCP_POST_CR; if (wsi->chunked && *len) goto spin_chunks; if (wsi->chunked) return 0; /* if we know the content length, decrement the content remaining */ if (wsi->http.rx_content_length > 0) wsi->http.rx_content_remain -= n; // lwsl_notice("rx_content_remain %lld, rx_content_length %lld\n", // wsi->http.rx_content_remain, wsi->http.rx_content_length); if (wsi->http.rx_content_remain || !wsi->http.rx_content_length) return 0; completed: if (lws_http_transaction_completed_client(wsi)) { lwsl_notice("%s: transaction completed says -1\n", __func__); return -1; } return 0; } #endif