/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ***************************************************************************/ #include "curl_setup.h" #ifndef CURL_DISABLE_RTSP #include "urldata.h" #include <curl/curl.h> #include "transfer.h" #include "sendf.h" #include "multiif.h" #include "http.h" #include "url.h" #include "progress.h" #include "rtsp.h" #include "rawstr.h" #include "curl_memory.h" #include "select.h" #include "connect.h" #define _MPRINTF_REPLACE /* use our functions only */ #include <curl/mprintf.h> /* The last #include file should be: */ #include "memdebug.h" /* * TODO (general) * -incoming server requests * -server CSeq counter * -digest authentication * -connect thru proxy * -pipelining? */ #define RTP_PKT_CHANNEL(p) ((int)((unsigned char)((p)[1]))) #define RTP_PKT_LENGTH(p) ((((int)((unsigned char)((p)[2]))) << 8) | \ ((int)((unsigned char)((p)[3])))) /* protocol-specific functions set up to be called by the main engine */ static CURLcode rtsp_do(struct connectdata *conn, bool *done); static CURLcode rtsp_done(struct connectdata *conn, CURLcode, bool premature); static CURLcode rtsp_connect(struct connectdata *conn, bool *done); static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead); static int rtsp_getsock_do(struct connectdata *conn, curl_socket_t *socks, int numsocks); /* * Parse and write out any available RTP data. * * nread: amount of data left after k->str. will be modified if RTP * data is parsed and k->str is moved up * readmore: whether or not the RTP parser needs more data right away */ static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data, struct connectdata *conn, ssize_t *nread, bool *readmore); static CURLcode rtsp_setup_connection(struct connectdata *conn); /* this returns the socket to wait for in the DO and DOING state for the multi interface and then we're always _sending_ a request and thus we wait for the single socket to become writable only */ static int rtsp_getsock_do(struct connectdata *conn, curl_socket_t *socks, int numsocks) { /* write mode */ (void)numsocks; /* unused, we trust it to be at least 1 */ socks[0] = conn->sock[FIRSTSOCKET]; return GETSOCK_WRITESOCK(0); } static CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len); /* * RTSP handler interface. */ const struct Curl_handler Curl_handler_rtsp = { "RTSP", /* scheme */ rtsp_setup_connection, /* setup_connection */ rtsp_do, /* do_it */ rtsp_done, /* done */ ZERO_NULL, /* do_more */ rtsp_connect, /* connect_it */ ZERO_NULL, /* connecting */ ZERO_NULL, /* doing */ ZERO_NULL, /* proto_getsock */ rtsp_getsock_do, /* doing_getsock */ ZERO_NULL, /* domore_getsock */ ZERO_NULL, /* perform_getsock */ rtsp_disconnect, /* disconnect */ rtsp_rtp_readwrite, /* readwrite */ PORT_RTSP, /* defport */ CURLPROTO_RTSP, /* protocol */ PROTOPT_NONE /* flags */ }; static CURLcode rtsp_setup_connection(struct connectdata *conn) { struct RTSP *rtsp; conn->data->req.protop = rtsp = calloc(1, sizeof(struct RTSP)); if(!rtsp) return CURLE_OUT_OF_MEMORY; return CURLE_OK; } /* * The server may send us RTP data at any point, and RTSPREQ_RECEIVE does not * want to block the application forever while receiving a stream. Therefore, * we cannot assume that an RTSP socket is dead just because it is readable. * * Instead, if it is readable, run Curl_getconnectinfo() to peek at the socket * and distinguish between closed and data. */ bool Curl_rtsp_connisdead(struct connectdata *check) { int sval; bool ret_val = TRUE; sval = Curl_socket_ready(check->sock[FIRSTSOCKET], CURL_SOCKET_BAD, 0); if(sval == 0) { /* timeout */ ret_val = FALSE; } else if(sval & CURL_CSELECT_ERR) { /* socket is in an error state */ ret_val = TRUE; } else if((sval & CURL_CSELECT_IN) && check->data) { /* readable with no error. could be closed or could be alive but we can only check if we have a proper SessionHandle for the connection */ curl_socket_t connectinfo = Curl_getconnectinfo(check->data, &check); if(connectinfo != CURL_SOCKET_BAD) ret_val = FALSE; } return ret_val; } static CURLcode rtsp_connect(struct connectdata *conn, bool *done) { CURLcode httpStatus; struct SessionHandle *data = conn->data; httpStatus = Curl_http_connect(conn, done); /* Initialize the CSeq if not already done */ if(data->state.rtsp_next_client_CSeq == 0) data->state.rtsp_next_client_CSeq = 1; if(data->state.rtsp_next_server_CSeq == 0) data->state.rtsp_next_server_CSeq = 1; conn->proto.rtspc.rtp_channel = -1; return httpStatus; } static CURLcode rtsp_disconnect(struct connectdata *conn, bool dead) { (void) dead; Curl_safefree(conn->proto.rtspc.rtp_buf); return CURLE_OK; } static CURLcode rtsp_done(struct connectdata *conn, CURLcode status, bool premature) { struct SessionHandle *data = conn->data; struct RTSP *rtsp = data->req.protop; CURLcode httpStatus; long CSeq_sent; long CSeq_recv; /* Bypass HTTP empty-reply checks on receive */ if(data->set.rtspreq == RTSPREQ_RECEIVE) premature = TRUE; httpStatus = Curl_http_done(conn, status, premature); if(rtsp) { /* Check the sequence numbers */ CSeq_sent = rtsp->CSeq_sent; CSeq_recv = rtsp->CSeq_recv; if((data->set.rtspreq != RTSPREQ_RECEIVE) && (CSeq_sent != CSeq_recv)) { failf(data, "The CSeq of this request %ld did not match the response %ld", CSeq_sent, CSeq_recv); return CURLE_RTSP_CSEQ_ERROR; } else if(data->set.rtspreq == RTSPREQ_RECEIVE && (conn->proto.rtspc.rtp_channel == -1)) { infof(data, "Got an RTP Receive with a CSeq of %ld\n", CSeq_recv); /* TODO CPC: Server -> Client logic here */ } } return httpStatus; } static CURLcode rtsp_do(struct connectdata *conn, bool *done) { struct SessionHandle *data = conn->data; CURLcode result=CURLE_OK; Curl_RtspReq rtspreq = data->set.rtspreq; struct RTSP *rtsp = data->req.protop; struct HTTP *http; Curl_send_buffer *req_buffer; curl_off_t postsize = 0; /* for ANNOUNCE and SET_PARAMETER */ curl_off_t putsize = 0; /* for ANNOUNCE and SET_PARAMETER */ const char *p_request = NULL; const char *p_session_id = NULL; const char *p_accept = NULL; const char *p_accept_encoding = NULL; const char *p_range = NULL; const char *p_referrer = NULL; const char *p_stream_uri = NULL; const char *p_transport = NULL; const char *p_uagent = NULL; *done = TRUE; http = &(rtsp->http_wrapper); /* Assert that no one has changed the RTSP struct in an evil way */ DEBUGASSERT((void *)http == (void *)rtsp); rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq; rtsp->CSeq_recv = 0; /* Setup the 'p_request' pointer to the proper p_request string * Since all RTSP requests are included here, there is no need to * support custom requests like HTTP. **/ DEBUGASSERT((rtspreq > RTSPREQ_NONE && rtspreq < RTSPREQ_LAST)); data->set.opt_no_body = TRUE; /* most requests don't contain a body */ switch(rtspreq) { case RTSPREQ_NONE: failf(data, "Got invalid RTSP request: RTSPREQ_NONE"); return CURLE_BAD_FUNCTION_ARGUMENT; case RTSPREQ_OPTIONS: p_request = "OPTIONS"; break; case RTSPREQ_DESCRIBE: p_request = "DESCRIBE"; data->set.opt_no_body = FALSE; break; case RTSPREQ_ANNOUNCE: p_request = "ANNOUNCE"; break; case RTSPREQ_SETUP: p_request = "SETUP"; break; case RTSPREQ_PLAY: p_request = "PLAY"; break; case RTSPREQ_PAUSE: p_request = "PAUSE"; break; case RTSPREQ_TEARDOWN: p_request = "TEARDOWN"; break; case RTSPREQ_GET_PARAMETER: /* GET_PARAMETER's no_body status is determined later */ p_request = "GET_PARAMETER"; data->set.opt_no_body = FALSE; break; case RTSPREQ_SET_PARAMETER: p_request = "SET_PARAMETER"; break; case RTSPREQ_RECORD: p_request = "RECORD"; break; case RTSPREQ_RECEIVE: p_request = ""; /* Treat interleaved RTP as body*/ data->set.opt_no_body = FALSE; break; case RTSPREQ_LAST: failf(data, "Got invalid RTSP request: RTSPREQ_LAST"); return CURLE_BAD_FUNCTION_ARGUMENT; } if(rtspreq == RTSPREQ_RECEIVE) { Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount, -1, NULL); return result; } p_session_id = data->set.str[STRING_RTSP_SESSION_ID]; if(!p_session_id && (rtspreq & ~(RTSPREQ_OPTIONS | RTSPREQ_DESCRIBE | RTSPREQ_SETUP))) { failf(data, "Refusing to issue an RTSP request [%s] without a session ID.", p_request ? p_request : ""); return CURLE_BAD_FUNCTION_ARGUMENT; } /* TODO: auth? */ /* TODO: proxy? */ /* Stream URI. Default to server '*' if not specified */ if(data->set.str[STRING_RTSP_STREAM_URI]) { p_stream_uri = data->set.str[STRING_RTSP_STREAM_URI]; } else { p_stream_uri = "*"; } /* Transport Header for SETUP requests */ p_transport = Curl_checkheaders(conn, "Transport:"); if(rtspreq == RTSPREQ_SETUP && !p_transport) { /* New Transport: setting? */ if(data->set.str[STRING_RTSP_TRANSPORT]) { Curl_safefree(conn->allocptr.rtsp_transport); conn->allocptr.rtsp_transport = aprintf("Transport: %s\r\n", data->set.str[STRING_RTSP_TRANSPORT]); if(!conn->allocptr.rtsp_transport) return CURLE_OUT_OF_MEMORY; } else { failf(data, "Refusing to issue an RTSP SETUP without a Transport: header."); return CURLE_BAD_FUNCTION_ARGUMENT; } p_transport = conn->allocptr.rtsp_transport; } /* Accept Headers for DESCRIBE requests */ if(rtspreq == RTSPREQ_DESCRIBE) { /* Accept Header */ p_accept = Curl_checkheaders(conn, "Accept:")? NULL:"Accept: application/sdp\r\n"; /* Accept-Encoding header */ if(!Curl_checkheaders(conn, "Accept-Encoding:") && data->set.str[STRING_ENCODING]) { Curl_safefree(conn->allocptr.accept_encoding); conn->allocptr.accept_encoding = aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]); if(!conn->allocptr.accept_encoding) return CURLE_OUT_OF_MEMORY; p_accept_encoding = conn->allocptr.accept_encoding; } } /* The User-Agent string might have been allocated in url.c already, because it might have been used in the proxy connect, but if we have got a header with the user-agent string specified, we erase the previously made string here. */ if(Curl_checkheaders(conn, "User-Agent:") && conn->allocptr.uagent) { Curl_safefree(conn->allocptr.uagent); conn->allocptr.uagent = NULL; } else if(!Curl_checkheaders(conn, "User-Agent:") && data->set.str[STRING_USERAGENT]) { p_uagent = conn->allocptr.uagent; } /* Referrer */ Curl_safefree(conn->allocptr.ref); if(data->change.referer && !Curl_checkheaders(conn, "Referer:")) conn->allocptr.ref = aprintf("Referer: %s\r\n", data->change.referer); else conn->allocptr.ref = NULL; p_referrer = conn->allocptr.ref; /* * Range Header * Only applies to PLAY, PAUSE, RECORD * * Go ahead and use the Range stuff supplied for HTTP */ if(data->state.use_range && (rtspreq & (RTSPREQ_PLAY | RTSPREQ_PAUSE | RTSPREQ_RECORD))) { /* Check to see if there is a range set in the custom headers */ if(!Curl_checkheaders(conn, "Range:") && data->state.range) { Curl_safefree(conn->allocptr.rangeline); conn->allocptr.rangeline = aprintf("Range: %s\r\n", data->state.range); p_range = conn->allocptr.rangeline; } } /* * Sanity check the custom headers */ if(Curl_checkheaders(conn, "CSeq:")) { failf(data, "CSeq cannot be set as a custom header."); return CURLE_RTSP_CSEQ_ERROR; } if(Curl_checkheaders(conn, "Session:")) { failf(data, "Session ID cannot be set as a custom header."); return CURLE_BAD_FUNCTION_ARGUMENT; } /* Initialize a dynamic send buffer */ req_buffer = Curl_add_buffer_init(); if(!req_buffer) return CURLE_OUT_OF_MEMORY; result = Curl_add_bufferf(req_buffer, "%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */ "CSeq: %ld\r\n", /* CSeq */ (p_request ? p_request : ""), p_stream_uri, rtsp->CSeq_sent); if(result) return result; /* * Rather than do a normal alloc line, keep the session_id unformatted * to make comparison easier */ if(p_session_id) { result = Curl_add_bufferf(req_buffer, "Session: %s\r\n", p_session_id); if(result) return result; } /* * Shared HTTP-like options */ result = Curl_add_bufferf(req_buffer, "%s" /* transport */ "%s" /* accept */ "%s" /* accept-encoding */ "%s" /* range */ "%s" /* referrer */ "%s" /* user-agent */ , p_transport ? p_transport : "", p_accept ? p_accept : "", p_accept_encoding ? p_accept_encoding : "", p_range ? p_range : "", p_referrer ? p_referrer : "", p_uagent ? p_uagent : ""); if(result) return result; if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) { result = Curl_add_timecondition(data, req_buffer); if(result) return result; } result = Curl_add_custom_headers(conn, FALSE, req_buffer); if(result) return result; if(rtspreq == RTSPREQ_ANNOUNCE || rtspreq == RTSPREQ_SET_PARAMETER || rtspreq == RTSPREQ_GET_PARAMETER) { if(data->set.upload) { putsize = data->state.infilesize; data->set.httpreq = HTTPREQ_PUT; } else { postsize = (data->set.postfieldsize != -1)? data->set.postfieldsize: (data->set.postfields? (curl_off_t)strlen(data->set.postfields):0); data->set.httpreq = HTTPREQ_POST; } if(putsize > 0 || postsize > 0) { /* As stated in the http comments, it is probably not wise to * actually set a custom Content-Length in the headers */ if(!Curl_checkheaders(conn, "Content-Length:")) { result = Curl_add_bufferf(req_buffer, "Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n", (data->set.upload ? putsize : postsize)); if(result) return result; } if(rtspreq == RTSPREQ_SET_PARAMETER || rtspreq == RTSPREQ_GET_PARAMETER) { if(!Curl_checkheaders(conn, "Content-Type:")) { result = Curl_add_bufferf(req_buffer, "Content-Type: text/parameters\r\n"); if(result) return result; } } if(rtspreq == RTSPREQ_ANNOUNCE) { if(!Curl_checkheaders(conn, "Content-Type:")) { result = Curl_add_bufferf(req_buffer, "Content-Type: application/sdp\r\n"); if(result) return result; } } data->state.expect100header = FALSE; /* RTSP posts are simple/small */ } else if(rtspreq == RTSPREQ_GET_PARAMETER) { /* Check for an empty GET_PARAMETER (heartbeat) request */ data->set.httpreq = HTTPREQ_HEAD; data->set.opt_no_body = TRUE; } } /* RTSP never allows chunked transfer */ data->req.forbidchunk = TRUE; /* Finish the request buffer */ result = Curl_add_buffer(req_buffer, "\r\n", 2); if(result) return result; if(postsize > 0) { result = Curl_add_buffer(req_buffer, data->set.postfields, (size_t)postsize); if(result) return result; } /* issue the request */ result = Curl_add_buffer_send(req_buffer, conn, &data->info.request_size, 0, FIRSTSOCKET); if(result) { failf(data, "Failed sending RTSP request"); return result; } Curl_setup_transfer(conn, FIRSTSOCKET, -1, TRUE, &http->readbytecount, putsize?FIRSTSOCKET:-1, putsize?&http->writebytecount:NULL); /* Increment the CSeq on success */ data->state.rtsp_next_client_CSeq++; if(http->writebytecount) { /* if a request-body has been sent off, we make sure this progress is noted properly */ Curl_pgrsSetUploadCounter(data, http->writebytecount); if(Curl_pgrsUpdate(conn)) result = CURLE_ABORTED_BY_CALLBACK; } return result; } static CURLcode rtsp_rtp_readwrite(struct SessionHandle *data, struct connectdata *conn, ssize_t *nread, bool *readmore) { struct SingleRequest *k = &data->req; struct rtsp_conn *rtspc = &(conn->proto.rtspc); char *rtp; /* moving pointer to rtp data */ ssize_t rtp_dataleft; /* how much data left to parse in this round */ char *scratch; CURLcode result; if(rtspc->rtp_buf) { /* There was some leftover data the last time. Merge buffers */ char *newptr = realloc(rtspc->rtp_buf, rtspc->rtp_bufsize + *nread); if(!newptr) { Curl_safefree(rtspc->rtp_buf); rtspc->rtp_buf = NULL; rtspc->rtp_bufsize = 0; return CURLE_OUT_OF_MEMORY; } rtspc->rtp_buf = newptr; memcpy(rtspc->rtp_buf + rtspc->rtp_bufsize, k->str, *nread); rtspc->rtp_bufsize += *nread; rtp = rtspc->rtp_buf; rtp_dataleft = rtspc->rtp_bufsize; } else { /* Just parse the request buffer directly */ rtp = k->str; rtp_dataleft = *nread; } while((rtp_dataleft > 0) && (rtp[0] == '$')) { if(rtp_dataleft > 4) { int rtp_length; /* Parse the header */ /* The channel identifier immediately follows and is 1 byte */ rtspc->rtp_channel = RTP_PKT_CHANNEL(rtp); /* The length is two bytes */ rtp_length = RTP_PKT_LENGTH(rtp); if(rtp_dataleft < rtp_length + 4) { /* Need more - incomplete payload*/ *readmore = TRUE; break; } else { /* We have the full RTP interleaved packet * Write out the header including the leading '$' */ DEBUGF(infof(data, "RTP write channel %d rtp_length %d\n", rtspc->rtp_channel, rtp_length)); result = rtp_client_write(conn, &rtp[0], rtp_length + 4); if(result) { failf(data, "Got an error writing an RTP packet"); *readmore = FALSE; Curl_safefree(rtspc->rtp_buf); rtspc->rtp_buf = NULL; rtspc->rtp_bufsize = 0; return result; } /* Move forward in the buffer */ rtp_dataleft -= rtp_length + 4; rtp += rtp_length + 4; if(data->set.rtspreq == RTSPREQ_RECEIVE) { /* If we are in a passive receive, give control back * to the app as often as we can. */ k->keepon &= ~KEEP_RECV; } } } else { /* Need more - incomplete header */ *readmore = TRUE; break; } } if(rtp_dataleft != 0 && rtp[0] == '$') { DEBUGF(infof(data, "RTP Rewinding %zd %s\n", rtp_dataleft, *readmore ? "(READMORE)" : "")); /* Store the incomplete RTP packet for a "rewind" */ scratch = malloc(rtp_dataleft); if(!scratch) { Curl_safefree(rtspc->rtp_buf); rtspc->rtp_buf = NULL; rtspc->rtp_bufsize = 0; return CURLE_OUT_OF_MEMORY; } memcpy(scratch, rtp, rtp_dataleft); Curl_safefree(rtspc->rtp_buf); rtspc->rtp_buf = scratch; rtspc->rtp_bufsize = rtp_dataleft; /* As far as the transfer is concerned, this data is consumed */ *nread = 0; return CURLE_OK; } else { /* Fix up k->str to point just after the last RTP packet */ k->str += *nread - rtp_dataleft; /* either all of the data has been read or... * rtp now points at the next byte to parse */ if(rtp_dataleft > 0) DEBUGASSERT(k->str[0] == rtp[0]); DEBUGASSERT(rtp_dataleft <= *nread); /* sanity check */ *nread = rtp_dataleft; } /* If we get here, we have finished with the leftover/merge buffer */ Curl_safefree(rtspc->rtp_buf); rtspc->rtp_buf = NULL; rtspc->rtp_bufsize = 0; return CURLE_OK; } static CURLcode rtp_client_write(struct connectdata *conn, char *ptr, size_t len) { struct SessionHandle *data = conn->data; size_t wrote; curl_write_callback writeit; if(len == 0) { failf (data, "Cannot write a 0 size RTP packet."); return CURLE_WRITE_ERROR; } writeit = data->set.fwrite_rtp?data->set.fwrite_rtp:data->set.fwrite_func; wrote = writeit(ptr, 1, len, data->set.rtp_out); if(CURL_WRITEFUNC_PAUSE == wrote) { failf (data, "Cannot pause RTP"); return CURLE_WRITE_ERROR; } if(wrote != len) { failf (data, "Failed writing RTP data"); return CURLE_WRITE_ERROR; } return CURLE_OK; } CURLcode Curl_rtsp_parseheader(struct connectdata *conn, char *header) { struct SessionHandle *data = conn->data; long CSeq = 0; if(checkprefix("CSeq:", header)) { /* Store the received CSeq. Match is verified in rtsp_done */ int nc = sscanf(&header[4], ": %ld", &CSeq); if(nc == 1) { struct RTSP *rtsp = data->req.protop; rtsp->CSeq_recv = CSeq; /* mark the request */ data->state.rtsp_CSeq_recv = CSeq; /* update the handle */ } else { failf(data, "Unable to read the CSeq header: [%s]", header); return CURLE_RTSP_CSEQ_ERROR; } } else if(checkprefix("Session:", header)) { char *start; /* Find the first non-space letter */ start = header + 8; while(*start && ISSPACE(*start)) start++; if(!*start) { failf(data, "Got a blank Session ID"); } else if(data->set.str[STRING_RTSP_SESSION_ID]) { /* If the Session ID is set, then compare */ if(strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], strlen(data->set.str[STRING_RTSP_SESSION_ID])) != 0) { failf(data, "Got RTSP Session ID Line [%s], but wanted ID [%s]", start, data->set.str[STRING_RTSP_SESSION_ID]); return CURLE_RTSP_SESSION_ERROR; } } else { /* If the Session ID is not set, and we find it in a response, then set it */ /* The session ID can be an alphanumeric or a 'safe' character * * RFC 2326 15.1 Base Syntax: * safe = "\$" | "-" | "_" | "." | "+" * */ char *end = start; while(*end && (ISALNUM(*end) || *end == '-' || *end == '_' || *end == '.' || *end == '+' || (*end == '\\' && *(end + 1) && *(end + 1) == '$' && (++end, 1)))) end++; /* Copy the id substring into a new buffer */ data->set.str[STRING_RTSP_SESSION_ID] = malloc(end - start + 1); if(data->set.str[STRING_RTSP_SESSION_ID] == NULL) return CURLE_OUT_OF_MEMORY; memcpy(data->set.str[STRING_RTSP_SESSION_ID], start, end - start); (data->set.str[STRING_RTSP_SESSION_ID])[end - start] = '\0'; } } return CURLE_OK; } #endif /* CURL_DISABLE_RTSP */