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f786fce914
curl/lib/rtsp.c
Viktor Szakats 72abf7c13a
lib: tidy up types and casts 
Cherry-picked from #13489
Closes #13862
2024-06-05 14:02:39 +02:00

1043 lines
32 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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 https://curl.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_RTSP) && !defined(USE_HYPER)
#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 "strcase.h"
#include "select.h"
#include "connect.h"
#include "cfilters.h"
#include "strdup.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#define RTP_PKT_LENGTH(p) ((((unsigned int)((unsigned char)((p)[2]))) << 8) | \
((unsigned int)((unsigned char)((p)[3]))))
/* protocol-specific functions set up to be called by the main engine */
static CURLcode rtsp_do(struct Curl_easy *data, bool *done);
static CURLcode rtsp_done(struct Curl_easy *data, CURLcode, bool premature);
static CURLcode rtsp_connect(struct Curl_easy *data, bool *done);
static CURLcode rtsp_disconnect(struct Curl_easy *data,
struct connectdata *conn, bool dead);
static int rtsp_getsock_do(struct Curl_easy *data,
struct connectdata *conn, curl_socket_t *socks);
/*
* Parse and write out an RTSP response.
* @param data the transfer
* @param conn the connection
* @param buf data read from connection
* @param blen amount of data in buf
* @param is_eos TRUE iff this is the last write
* @param readmore out, TRUE iff complete buf was consumed and more data
* is needed
*/
static CURLcode rtsp_rtp_write_resp(struct Curl_easy *data,
const char *buf,
size_t blen,
bool is_eos);
static CURLcode rtsp_setup_connection(struct Curl_easy *data,
struct connectdata *conn);
static unsigned int rtsp_conncheck(struct Curl_easy *data,
struct connectdata *check,
unsigned int checks_to_perform);
/* 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 Curl_easy *data, struct connectdata *conn,
curl_socket_t *socks)
{
/* write mode */
(void)data;
socks[0] = conn->sock[FIRSTSOCKET];
return GETSOCK_WRITESOCK(0);
}
static
CURLcode rtp_client_write(struct Curl_easy *data, const char *ptr, size_t len);
static
CURLcode rtsp_parse_transport(struct Curl_easy *data, const char *transport);
/*
* 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_write_resp, /* write_resp */
ZERO_NULL, /* write_resp_hd */
rtsp_conncheck, /* connection_check */
ZERO_NULL, /* attach connection */
PORT_RTSP, /* defport */
CURLPROTO_RTSP, /* protocol */
CURLPROTO_RTSP, /* family */
PROTOPT_NONE /* flags */
};
#define MAX_RTP_BUFFERSIZE 1000000 /* arbitrary */
static CURLcode rtsp_setup_connection(struct Curl_easy *data,
struct connectdata *conn)
{
struct RTSP *rtsp;
(void)conn;
data->req.p.rtsp = rtsp = calloc(1, sizeof(struct RTSP));
if(!rtsp)
return CURLE_OUT_OF_MEMORY;
Curl_dyn_init(&conn->proto.rtspc.buf, MAX_RTP_BUFFERSIZE);
return CURLE_OK;
}
/*
* Function to check on various aspects of a connection.
*/
static unsigned int rtsp_conncheck(struct Curl_easy *data,
struct connectdata *conn,
unsigned int checks_to_perform)
{
unsigned int ret_val = CONNRESULT_NONE;
(void)data;
if(checks_to_perform & CONNCHECK_ISDEAD) {
bool input_pending;
if(!Curl_conn_is_alive(data, conn, &input_pending))
ret_val |= CONNRESULT_DEAD;
}
return ret_val;
}
static CURLcode rtsp_connect(struct Curl_easy *data, bool *done)
{
CURLcode httpStatus;
httpStatus = Curl_http_connect(data, 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;
data->conn->proto.rtspc.rtp_channel = -1;
return httpStatus;
}
static CURLcode rtsp_disconnect(struct Curl_easy *data,
struct connectdata *conn, bool dead)
{
(void) dead;
(void) data;
Curl_dyn_free(&conn->proto.rtspc.buf);
return CURLE_OK;
}
static CURLcode rtsp_done(struct Curl_easy *data,
CURLcode status, bool premature)
{
struct RTSP *rtsp = data->req.p.rtsp;
CURLcode httpStatus;
/* Bypass HTTP empty-reply checks on receive */
if(data->set.rtspreq == RTSPREQ_RECEIVE)
premature = TRUE;
httpStatus = Curl_http_done(data, status, premature);
if(rtsp && !status && !httpStatus) {
/* Check the sequence numbers */
long CSeq_sent = rtsp->CSeq_sent;
long 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;
}
if(data->set.rtspreq == RTSPREQ_RECEIVE &&
(data->conn->proto.rtspc.rtp_channel == -1)) {
infof(data, "Got an RTP Receive with a CSeq of %ld", CSeq_recv);
}
}
return httpStatus;
}
static CURLcode rtsp_do(struct Curl_easy *data, bool *done)
{
struct connectdata *conn = data->conn;
CURLcode result = CURLE_OK;
Curl_RtspReq rtspreq = data->set.rtspreq;
struct RTSP *rtsp = data->req.p.rtsp;
struct dynbuf req_buffer;
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;
const char *p_proxyuserpwd = NULL;
const char *p_userpwd = NULL;
*done = TRUE;
/* Initialize a dynamic send buffer */
Curl_dyn_init(&req_buffer, DYN_RTSP_REQ_HEADER);
rtsp->CSeq_sent = data->state.rtsp_next_client_CSeq;
rtsp->CSeq_recv = 0;
/* Setup the first_* fields to allow auth details get sent
to this origin */
if(!data->state.first_host) {
data->state.first_host = strdup(conn->host.name);
if(!data->state.first_host)
return CURLE_OUT_OF_MEMORY;
data->state.first_remote_port = conn->remote_port;
data->state.first_remote_protocol = conn->handler->protocol;
}
/* 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.
**/
data->req.no_body = TRUE; /* most requests don't contain a body */
switch(rtspreq) {
default:
failf(data, "Got invalid RTSP request");
return CURLE_BAD_FUNCTION_ARGUMENT;
case RTSPREQ_OPTIONS:
p_request = "OPTIONS";
break;
case RTSPREQ_DESCRIBE:
p_request = "DESCRIBE";
data->req.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->req.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->req.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_xfer_setup(data, FIRSTSOCKET, -1, TRUE, -1);
goto out;
}
p_session_id = data->set.str[STRING_RTSP_SESSION_ID];
if(!p_session_id &&
(rtspreq & ~(Curl_RtspReq)(RTSPREQ_OPTIONS |
RTSPREQ_DESCRIBE |
RTSPREQ_SETUP))) {
failf(data, "Refusing to issue an RTSP request [%s] without a session ID.",
p_request);
result = CURLE_BAD_FUNCTION_ARGUMENT;
goto out;
}
/* 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(data, STRCONST("Transport"));
if(rtspreq == RTSPREQ_SETUP && !p_transport) {
/* New Transport: setting? */
if(data->set.str[STRING_RTSP_TRANSPORT]) {
Curl_safefree(data->state.aptr.rtsp_transport);
data->state.aptr.rtsp_transport =
aprintf("Transport: %s\r\n",
data->set.str[STRING_RTSP_TRANSPORT]);
if(!data->state.aptr.rtsp_transport)
return CURLE_OUT_OF_MEMORY;
}
else {
failf(data,
"Refusing to issue an RTSP SETUP without a Transport: header.");
result = CURLE_BAD_FUNCTION_ARGUMENT;
goto out;
}
p_transport = data->state.aptr.rtsp_transport;
}
/* Accept Headers for DESCRIBE requests */
if(rtspreq == RTSPREQ_DESCRIBE) {
/* Accept Header */
p_accept = Curl_checkheaders(data, STRCONST("Accept"))?
NULL:"Accept: application/sdp\r\n";
/* Accept-Encoding header */
if(!Curl_checkheaders(data, STRCONST("Accept-Encoding")) &&
data->set.str[STRING_ENCODING]) {
Curl_safefree(data->state.aptr.accept_encoding);
data->state.aptr.accept_encoding =
aprintf("Accept-Encoding: %s\r\n", data->set.str[STRING_ENCODING]);
if(!data->state.aptr.accept_encoding) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
p_accept_encoding = data->state.aptr.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(data, STRCONST("User-Agent")) &&
data->state.aptr.uagent) {
Curl_safefree(data->state.aptr.uagent);
}
else if(!Curl_checkheaders(data, STRCONST("User-Agent")) &&
data->set.str[STRING_USERAGENT]) {
p_uagent = data->state.aptr.uagent;
}
/* setup the authentication headers */
result = Curl_http_output_auth(data, conn, p_request, HTTPREQ_GET,
p_stream_uri, FALSE);
if(result)
goto out;
#ifndef CURL_DISABLE_PROXY
p_proxyuserpwd = data->state.aptr.proxyuserpwd;
#endif
p_userpwd = data->state.aptr.userpwd;
/* Referrer */
Curl_safefree(data->state.aptr.ref);
if(data->state.referer && !Curl_checkheaders(data, STRCONST("Referer")))
data->state.aptr.ref = aprintf("Referer: %s\r\n", data->state.referer);
p_referrer = data->state.aptr.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(data, STRCONST("Range")) && data->state.range) {
Curl_safefree(data->state.aptr.rangeline);
data->state.aptr.rangeline = aprintf("Range: %s\r\n", data->state.range);
p_range = data->state.aptr.rangeline;
}
}
/*
* Sanity check the custom headers
*/
if(Curl_checkheaders(data, STRCONST("CSeq"))) {
failf(data, "CSeq cannot be set as a custom header.");
result = CURLE_RTSP_CSEQ_ERROR;
goto out;
}
if(Curl_checkheaders(data, STRCONST("Session"))) {
failf(data, "Session ID cannot be set as a custom header.");
result = CURLE_BAD_FUNCTION_ARGUMENT;
goto out;
}
result =
Curl_dyn_addf(&req_buffer,
"%s %s RTSP/1.0\r\n" /* Request Stream-URI RTSP/1.0 */
"CSeq: %ld\r\n", /* CSeq */
p_request, p_stream_uri, rtsp->CSeq_sent);
if(result)
goto out;
/*
* Rather than do a normal alloc line, keep the session_id unformatted
* to make comparison easier
*/
if(p_session_id) {
result = Curl_dyn_addf(&req_buffer, "Session: %s\r\n", p_session_id);
if(result)
goto out;
}
/*
* Shared HTTP-like options
*/
result = Curl_dyn_addf(&req_buffer,
"%s" /* transport */
"%s" /* accept */
"%s" /* accept-encoding */
"%s" /* range */
"%s" /* referrer */
"%s" /* user-agent */
"%s" /* proxyuserpwd */
"%s" /* userpwd */
,
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 : "",
p_proxyuserpwd ? p_proxyuserpwd : "",
p_userpwd ? p_userpwd : "");
/*
* Free userpwd now --- cannot reuse this for Negotiate and possibly NTLM
* with basic and digest, it will be freed anyway by the next request
*/
Curl_safefree(data->state.aptr.userpwd);
if(result)
goto out;
if((rtspreq == RTSPREQ_SETUP) || (rtspreq == RTSPREQ_DESCRIBE)) {
result = Curl_add_timecondition(data, &req_buffer);
if(result)
goto out;
}
result = Curl_add_custom_headers(data, FALSE, &req_buffer);
if(result)
goto out;
if(rtspreq == RTSPREQ_ANNOUNCE ||
rtspreq == RTSPREQ_SET_PARAMETER ||
rtspreq == RTSPREQ_GET_PARAMETER) {
curl_off_t req_clen; /* request content length */
if(data->state.upload) {
req_clen = data->state.infilesize;
data->state.httpreq = HTTPREQ_PUT;
result = Curl_creader_set_fread(data, req_clen);
if(result)
goto out;
}
else {
if(data->set.postfields) {
size_t plen = strlen(data->set.postfields);
req_clen = (curl_off_t)plen;
result = Curl_creader_set_buf(data, data->set.postfields, plen);
}
else if(data->state.infilesize >= 0) {
req_clen = data->state.infilesize;
result = Curl_creader_set_fread(data, req_clen);
}
else {
req_clen = 0;
result = Curl_creader_set_null(data);
}
if(result)
goto out;
}
if(req_clen > 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(data, STRCONST("Content-Length"))) {
result =
Curl_dyn_addf(&req_buffer,
"Content-Length: %" CURL_FORMAT_CURL_OFF_T"\r\n",
req_clen);
if(result)
goto out;
}
if(rtspreq == RTSPREQ_SET_PARAMETER ||
rtspreq == RTSPREQ_GET_PARAMETER) {
if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
result = Curl_dyn_addn(&req_buffer,
STRCONST("Content-Type: "
"text/parameters\r\n"));
if(result)
goto out;
}
}
if(rtspreq == RTSPREQ_ANNOUNCE) {
if(!Curl_checkheaders(data, STRCONST("Content-Type"))) {
result = Curl_dyn_addn(&req_buffer,
STRCONST("Content-Type: "
"application/sdp\r\n"));
if(result)
goto out;
}
}
}
else if(rtspreq == RTSPREQ_GET_PARAMETER) {
/* Check for an empty GET_PARAMETER (heartbeat) request */
data->state.httpreq = HTTPREQ_HEAD;
data->req.no_body = TRUE;
}
}
else {
result = Curl_creader_set_null(data);
if(result)
goto out;
}
/* Finish the request buffer */
result = Curl_dyn_addn(&req_buffer, STRCONST("\r\n"));
if(result)
goto out;
Curl_xfer_setup(data, FIRSTSOCKET, -1, TRUE, FIRSTSOCKET);
/* issue the request */
result = Curl_req_send(data, &req_buffer);
if(result) {
failf(data, "Failed sending RTSP request");
goto out;
}
/* Increment the CSeq on success */
data->state.rtsp_next_client_CSeq++;
if(data->req.writebytecount) {
/* if a request-body has been sent off, we make sure this progress is
noted properly */
Curl_pgrsSetUploadCounter(data, data->req.writebytecount);
if(Curl_pgrsUpdate(data))
result = CURLE_ABORTED_BY_CALLBACK;
}
out:
Curl_dyn_free(&req_buffer);
return result;
}
/**
* write any BODY bytes missing to the client, ignore the rest.
*/
static CURLcode rtp_write_body_junk(struct Curl_easy *data,
const char *buf,
size_t blen)
{
struct rtsp_conn *rtspc = &(data->conn->proto.rtspc);
curl_off_t body_remain;
bool in_body;
in_body = (data->req.headerline && !rtspc->in_header) &&
(data->req.size >= 0) &&
(data->req.bytecount < data->req.size);
body_remain = in_body? (data->req.size - data->req.bytecount) : 0;
DEBUGASSERT(body_remain >= 0);
if(body_remain) {
if((curl_off_t)blen > body_remain)
blen = (size_t)body_remain;
return Curl_client_write(data, CLIENTWRITE_BODY, (char *)buf, blen);
}
return CURLE_OK;
}
static CURLcode rtsp_filter_rtp(struct Curl_easy *data,
const char *buf,
size_t blen,
size_t *pconsumed)
{
struct rtsp_conn *rtspc = &(data->conn->proto.rtspc);
CURLcode result = CURLE_OK;
size_t skip_len = 0;
*pconsumed = 0;
while(blen) {
bool in_body = (data->req.headerline && !rtspc->in_header) &&
(data->req.size >= 0) &&
(data->req.bytecount < data->req.size);
switch(rtspc->state) {
case RTP_PARSE_SKIP: {
DEBUGASSERT(Curl_dyn_len(&rtspc->buf) == 0);
while(blen && buf[0] != '$') {
if(!in_body && buf[0] == 'R' &&
data->set.rtspreq != RTSPREQ_RECEIVE) {
if(strncmp(buf, "RTSP/", (blen < 5) ? blen : 5) == 0) {
/* This could be the next response, no consume and return */
if(*pconsumed) {
DEBUGF(infof(data, "RTP rtsp_filter_rtp[SKIP] RTSP/ prefix, "
"skipping %zd bytes of junk", *pconsumed));
}
rtspc->state = RTP_PARSE_SKIP;
rtspc->in_header = TRUE;
goto out;
}
}
/* junk/BODY, consume without buffering */
*pconsumed += 1;
++buf;
--blen;
++skip_len;
}
if(blen && buf[0] == '$') {
/* possible start of an RTP message, buffer */
if(skip_len) {
/* end of junk/BODY bytes, flush */
result = rtp_write_body_junk(data,
(char *)(buf - skip_len), skip_len);
skip_len = 0;
if(result)
goto out;
}
if(Curl_dyn_addn(&rtspc->buf, buf, 1)) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
*pconsumed += 1;
++buf;
--blen;
rtspc->state = RTP_PARSE_CHANNEL;
}
break;
}
case RTP_PARSE_CHANNEL: {
int idx = ((unsigned char)buf[0]) / 8;
int off = ((unsigned char)buf[0]) % 8;
DEBUGASSERT(Curl_dyn_len(&rtspc->buf) == 1);
if(!(data->state.rtp_channel_mask[idx] & (1 << off))) {
/* invalid channel number, junk or BODY data */
rtspc->state = RTP_PARSE_SKIP;
DEBUGASSERT(skip_len == 0);
/* we do not consume this byte, it is BODY data */
DEBUGF(infof(data, "RTSP: invalid RTP channel %d, skipping", idx));
if(*pconsumed == 0) {
/* We did not consume the initial '$' in our buffer, but had
* it from an earlier call. We cannot un-consume it and have
* to write it directly as BODY data */
result = rtp_write_body_junk(data, Curl_dyn_ptr(&rtspc->buf), 1);
if(result)
goto out;
}
else {
/* count the '$' as skip and continue */
skip_len = 1;
}
Curl_dyn_free(&rtspc->buf);
break;
}
/* a valid channel, so we expect this to be a real RTP message */
rtspc->rtp_channel = (unsigned char)buf[0];
if(Curl_dyn_addn(&rtspc->buf, buf, 1)) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
*pconsumed += 1;
++buf;
--blen;
rtspc->state = RTP_PARSE_LEN;
break;
}
case RTP_PARSE_LEN: {
size_t rtp_len = Curl_dyn_len(&rtspc->buf);
const char *rtp_buf;
DEBUGASSERT(rtp_len >= 2 && rtp_len < 4);
if(Curl_dyn_addn(&rtspc->buf, buf, 1)) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
*pconsumed += 1;
++buf;
--blen;
if(rtp_len == 2)
break;
rtp_buf = Curl_dyn_ptr(&rtspc->buf);
rtspc->rtp_len = RTP_PKT_LENGTH(rtp_buf) + 4;
rtspc->state = RTP_PARSE_DATA;
break;
}
case RTP_PARSE_DATA: {
size_t rtp_len = Curl_dyn_len(&rtspc->buf);
size_t needed;
DEBUGASSERT(rtp_len < rtspc->rtp_len);
needed = rtspc->rtp_len - rtp_len;
if(needed <= blen) {
if(Curl_dyn_addn(&rtspc->buf, buf, needed)) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
*pconsumed += needed;
buf += needed;
blen -= needed;
/* complete RTP message in buffer */
DEBUGF(infof(data, "RTP write channel %d rtp_len %zu",
rtspc->rtp_channel, rtspc->rtp_len));
result = rtp_client_write(data, Curl_dyn_ptr(&rtspc->buf),
rtspc->rtp_len);
Curl_dyn_free(&rtspc->buf);
rtspc->state = RTP_PARSE_SKIP;
if(result)
goto out;
}
else {
if(Curl_dyn_addn(&rtspc->buf, buf, blen)) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
*pconsumed += blen;
buf += blen;
blen = 0;
}
break;
}
default:
DEBUGASSERT(0);
return CURLE_RECV_ERROR;
}
}
out:
if(!result && skip_len)
result = rtp_write_body_junk(data, (char *)(buf - skip_len), skip_len);
return result;
}
static CURLcode rtsp_rtp_write_resp(struct Curl_easy *data,
const char *buf,
size_t blen,
bool is_eos)
{
struct rtsp_conn *rtspc = &(data->conn->proto.rtspc);
CURLcode result = CURLE_OK;
size_t consumed = 0;
if(!data->req.header)
rtspc->in_header = FALSE;
if(!blen) {
goto out;
}
DEBUGF(infof(data, "rtsp_rtp_write_resp(len=%zu, in_header=%d, eos=%d)",
blen, rtspc->in_header, is_eos));
/* If header parsing is not ongoing, extract RTP messages */
if(!rtspc->in_header) {
result = rtsp_filter_rtp(data, buf, blen, &consumed);
if(result)
goto out;
buf += consumed;
blen -= consumed;
/* either we consumed all or are at the start of header parsing */
if(blen && !data->req.header)
DEBUGF(infof(data, "RTSP: %zu bytes, possibly excess in response body",
blen));
}
/* we want to parse headers, do so */
if(data->req.header && blen) {
rtspc->in_header = TRUE;
result = Curl_http_write_resp_hds(data, buf, blen, &consumed);
if(result)
goto out;
buf += consumed;
blen -= consumed;
if(!data->req.header)
rtspc->in_header = FALSE;
if(!rtspc->in_header) {
/* If header parsing is done, extract interleaved RTP messages */
if(data->req.size <= -1) {
/* Respect section 4.4 of rfc2326: If the Content-Length header is
absent, a length 0 must be assumed. */
data->req.size = 0;
data->req.download_done = TRUE;
}
result = rtsp_filter_rtp(data, buf, blen, &consumed);
if(result)
goto out;
blen -= consumed;
}
}
if(rtspc->state != RTP_PARSE_SKIP)
data->req.done = FALSE;
/* we SHOULD have consumed all bytes, unless the response is borked.
* In which case we write out the left over bytes, letting the client
* writer deal with it (it will report EXCESS and fail the transfer). */
DEBUGF(infof(data, "rtsp_rtp_write_resp(len=%zu, in_header=%d, done=%d "
" rtspc->state=%d, req.size=%" CURL_FORMAT_CURL_OFF_T ")",
blen, rtspc->in_header, data->req.done, rtspc->state,
data->req.size));
if(!result && (is_eos || blen)) {
result = Curl_client_write(data, CLIENTWRITE_BODY|
(is_eos? CLIENTWRITE_EOS:0),
(char *)buf, blen);
}
out:
if((data->set.rtspreq == RTSPREQ_RECEIVE) &&
(rtspc->state == RTP_PARSE_SKIP)) {
/* In special mode RECEIVE, we just process one chunk of network
* data, so we stop the transfer here, if we have no incomplete
* RTP message pending. */
data->req.download_done = TRUE;
}
return result;
}
static
CURLcode rtp_client_write(struct Curl_easy *data, const char *ptr, size_t len)
{
size_t wrote;
curl_write_callback writeit;
void *user_ptr;
if(len == 0) {
failf(data, "Cannot write a 0 size RTP packet.");
return CURLE_WRITE_ERROR;
}
/* If the user has configured CURLOPT_INTERLEAVEFUNCTION then use that
function and any configured CURLOPT_INTERLEAVEDATA to write out the RTP
data. Otherwise, use the CURLOPT_WRITEFUNCTION with the CURLOPT_WRITEDATA
pointer to write out the RTP data. */
if(data->set.fwrite_rtp) {
writeit = data->set.fwrite_rtp;
user_ptr = data->set.rtp_out;
}
else {
writeit = data->set.fwrite_func;
user_ptr = data->set.out;
}
Curl_set_in_callback(data, true);
wrote = writeit((char *)ptr, 1, len, user_ptr);
Curl_set_in_callback(data, false);
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 Curl_easy *data, const char *header)
{
if(checkprefix("CSeq:", header)) {
long CSeq = 0;
char *endp;
const char *p = &header[5];
while(ISBLANK(*p))
p++;
CSeq = strtol(p, &endp, 10);
if(p != endp) {
struct RTSP *rtsp = data->req.p.rtsp;
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)) {
const char *start, *end;
size_t idlen;
/* Find the first non-space letter */
start = header + 8;
while(*start && ISBLANK(*start))
start++;
if(!*start) {
failf(data, "Got a blank Session ID");
return CURLE_RTSP_SESSION_ERROR;
}
/* Find the end of Session ID
*
* Allow any non whitespace content, up to the field separator or end of
* line. RFC 2326 isn't 100% clear on the session ID and for example
* gstreamer does url-encoded session ID's not covered by the standard.
*/
end = start;
while(*end && *end != ';' && !ISSPACE(*end))
end++;
idlen = end - start;
if(data->set.str[STRING_RTSP_SESSION_ID]) {
/* If the Session ID is set, then compare */
if(strlen(data->set.str[STRING_RTSP_SESSION_ID]) != idlen ||
strncmp(start, data->set.str[STRING_RTSP_SESSION_ID], idlen)) {
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.
*/
/* Copy the id substring into a new buffer */
data->set.str[STRING_RTSP_SESSION_ID] = Curl_memdup0(start, idlen);
if(!data->set.str[STRING_RTSP_SESSION_ID])
return CURLE_OUT_OF_MEMORY;
}
}
else if(checkprefix("Transport:", header)) {
CURLcode result;
result = rtsp_parse_transport(data, header + 10);
if(result)
return result;
}
return CURLE_OK;
}
static
CURLcode rtsp_parse_transport(struct Curl_easy *data, const char *transport)
{
/* If we receive multiple Transport response-headers, the linterleaved
channels of each response header is recorded and used together for
subsequent data validity checks.*/
/* e.g.: ' RTP/AVP/TCP;unicast;interleaved=5-6' */
const char *start, *end;
start = transport;
while(start && *start) {
while(*start && ISBLANK(*start) )
start++;
end = strchr(start, ';');
if(checkprefix("interleaved=", start)) {
long chan1, chan2, chan;
char *endp;
const char *p = start + 12;
chan1 = strtol(p, &endp, 10);
if(p != endp && chan1 >= 0 && chan1 <= 255) {
unsigned char *rtp_channel_mask = data->state.rtp_channel_mask;
chan2 = chan1;
if(*endp == '-') {
p = endp + 1;
chan2 = strtol(p, &endp, 10);
if(p == endp || chan2 < 0 || chan2 > 255) {
infof(data, "Unable to read the interleaved parameter from "
"Transport header: [%s]", transport);
chan2 = chan1;
}
}
for(chan = chan1; chan <= chan2; chan++) {
long idx = chan / 8;
long off = chan % 8;
rtp_channel_mask[idx] |= (unsigned char)(1 << off);
}
}
else {
infof(data, "Unable to read the interleaved parameter from "
"Transport header: [%s]", transport);
}
break;
}
/* skip to next parameter */
start = (!end) ? end : (end + 1);
}
return CURLE_OK;
}
#endif /* CURL_DISABLE_RTSP or using Hyper */
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