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-rw-r--r--libcurl/src/lib/rtsp.c807
1 files changed, 807 insertions, 0 deletions
diff --git a/libcurl/src/lib/rtsp.c b/libcurl/src/lib/rtsp.c
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+++ b/libcurl/src/lib/rtsp.c
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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, 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 "select.h"
+#include "connect.h"
+#include "curl_printf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#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.
+ */
+CURL_STATIC 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;
+}
+
+CURL_STATIC 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 */