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/***
This file is part of PulseAudio.
Copyright 2006 Lennart Poettering
PulseAudio 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; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio 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
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <time.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <pulse/xmalloc.h>
#include <pulse/util.h>
#include <pulsecore/core-util.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include <pulsecore/arpa-inet.h>
#include "sdp.h"
#include "rtp.h"
char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, uint16_t port, uint8_t payload, const pa_sample_spec *ss) {
uint32_t ntp;
char buf_src[64], buf_dst[64], un[64];
const char *u, *f;
pa_assert(src);
pa_assert(dst);
#ifdef HAVE_IPV6
pa_assert(af == AF_INET || af == AF_INET6);
#else
pa_assert(af == AF_INET);
#endif
pa_assert_se(f = pa_rtp_format_to_string(ss->format));
if (!(u = pa_get_user_name(un, sizeof(un))))
u = "-";
ntp = (uint32_t) time(NULL) + 2208988800U;
pa_assert_se(inet_ntop(af, src, buf_src, sizeof(buf_src)));
pa_assert_se(inet_ntop(af, dst, buf_dst, sizeof(buf_dst)));
return pa_sprintf_malloc(
PA_SDP_HEADER
"o=%s %lu 0 IN %s %s\n"
"s=%s\n"
"c=IN %s %s\n"
"t=%lu 0\n"
"a=recvonly\n"
"m=audio %u RTP/AVP %i\n"
"a=rtpmap:%i %s/%u/%u\n"
"a=type:broadcast\n",
u, (unsigned long) ntp, af == AF_INET ? "IP4" : "IP6", buf_src,
name,
af == AF_INET ? "IP4" : "IP6", buf_dst,
(unsigned long) ntp,
port, payload,
payload, f, ss->rate, ss->channels);
}
static pa_sample_spec *parse_sdp_sample_spec(pa_sample_spec *ss, char *c) {
unsigned rate, channels;
pa_assert(ss);
pa_assert(c);
if (pa_startswith(c, "L16/")) {
ss->format = PA_SAMPLE_S16BE;
c += 4;
} else
return NULL;
if (sscanf(c, "%u/%u", &rate, &channels) == 2) {
ss->rate = (uint32_t) rate;
ss->channels = (uint8_t) channels;
} else if (sscanf(c, "%u", &rate) == 2) {
ss->rate = (uint32_t) rate;
ss->channels = 1;
} else
return NULL;
if (!pa_sample_spec_valid(ss))
return NULL;
return ss;
}
pa_sdp_info *pa_sdp_parse(const char *t, pa_sdp_info *i, int is_goodbye) {
uint16_t port = 0;
bool ss_valid = false;
pa_assert(t);
pa_assert(i);
i->origin = i->session_name = NULL;
i->salen = 0;
i->payload = 255;
if (!pa_startswith(t, PA_SDP_HEADER)) {
pa_log("Failed to parse SDP data: invalid header.");
goto fail;
}
t += sizeof(PA_SDP_HEADER)-1;
while (*t) {
size_t l;
l = strcspn(t, "\n");
if (l <= 2) {
pa_log("Failed to parse SDP data: line too short: >%s<.", t);
goto fail;
}
if (pa_startswith(t, "o="))
i->origin = pa_xstrndup(t+2, l-2);
else if (pa_startswith(t, "s="))
i->session_name = pa_xstrndup(t+2, l-2);
else if (pa_startswith(t, "c=IN IP4 ")) {
char a[64];
size_t k;
k = l-8 > sizeof(a) ? sizeof(a) : l-8;
pa_strlcpy(a, t+9, k);
a[strcspn(a, "/")] = 0;
if (inet_pton(AF_INET, a, &((struct sockaddr_in*) &i->sa)->sin_addr) <= 0) {
pa_log("Failed to parse SDP data: bad address: >%s<.", a);
goto fail;
}
((struct sockaddr_in*) &i->sa)->sin_family = AF_INET;
((struct sockaddr_in*) &i->sa)->sin_port = 0;
i->salen = sizeof(struct sockaddr_in);
#ifdef HAVE_IPV6
} else if (pa_startswith(t, "c=IN IP6 ")) {
char a[64];
size_t k;
k = l-8 > sizeof(a) ? sizeof(a) : l-8;
pa_strlcpy(a, t+9, k);
a[strcspn(a, "/")] = 0;
if (inet_pton(AF_INET6, a, &((struct sockaddr_in6*) &i->sa)->sin6_addr) <= 0) {
pa_log("Failed to parse SDP data: bad address: >%s<.", a);
goto fail;
}
((struct sockaddr_in6*) &i->sa)->sin6_family = AF_INET6;
((struct sockaddr_in6*) &i->sa)->sin6_port = 0;
i->salen = sizeof(struct sockaddr_in6);
#endif
} else if (pa_startswith(t, "m=audio ")) {
if (i->payload > 127) {
int _port, _payload;
if (sscanf(t+8, "%i RTP/AVP %i", &_port, &_payload) == 2) {
if (_port <= 0 || _port > 0xFFFF) {
pa_log("Failed to parse SDP data: invalid port %i.", _port);
goto fail;
}
if (_payload < 0 || _payload > 127) {
pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
goto fail;
}
port = (uint16_t) _port;
i->payload = (uint8_t) _payload;
if (pa_rtp_sample_spec_from_payload(i->payload, &i->sample_spec))
ss_valid = true;
}
}
} else if (pa_startswith(t, "a=rtpmap:")) {
if (i->payload <= 127) {
char c[64];
int _payload;
int len;
if (sscanf(t + 9, "%i %n", &_payload, &len) == 1) {
if (_payload < 0 || _payload > 127) {
pa_log("Failed to parse SDP data: invalid payload %i.", _payload);
goto fail;
}
if (_payload == i->payload) {
strncpy(c, t + 9 + len, 63);
c[63] = 0;
c[strcspn(c, "\n")] = 0;
if (parse_sdp_sample_spec(&i->sample_spec, c))
ss_valid = true;
}
}
}
}
t += l;
if (*t == '\n')
t++;
}
if (!i->origin || (!is_goodbye && (!i->salen || i->payload > 127 || !ss_valid || port == 0))) {
pa_log("Failed to parse SDP data: missing data.");
goto fail;
}
if (((struct sockaddr*) &i->sa)->sa_family == AF_INET)
((struct sockaddr_in*) &i->sa)->sin_port = htons(port);
else
((struct sockaddr_in6*) &i->sa)->sin6_port = htons(port);
return i;
fail:
pa_xfree(i->origin);
pa_xfree(i->session_name);
return NULL;
}
void pa_sdp_info_destroy(pa_sdp_info *i) {
pa_assert(i);
pa_xfree(i->origin);
pa_xfree(i->session_name);
}
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