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rtp: Accept CRLF delimiters in SDP as required by RFC 4566

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RFC 4566 states that SDP record is terminated with CRLF, and parsers should be
able to accept records terminated with just LF. Pulseaudio only accepts LF here.

Fix this by accepting both CRLF and LF terminators.
This commit is contained in:
Igor V. Kovalenko 2022-05-27 22:41:51 +03:00 • committed by Tanu Kaskinen
parent 237c5a5c36
commit b55bcc3df3
3 changed files with 30 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

4
src/modules/rtp/sap.c
View file

@ -213,7 +213,9 @@ int pa_sap_recv(pa_sap_context *c, bool *goodbye) {
if ((unsigned) size >= sizeof(MIME_TYPE) && pa_streq(e, MIME_TYPE)) {
e += sizeof(MIME_TYPE);
size -= (int) sizeof(MIME_TYPE);
} else if ((unsigned) size < sizeof(PA_SDP_HEADER)-1 || strncmp(e, PA_SDP_HEADER, sizeof(PA_SDP_HEADER)-1)) {
} else if ((unsigned) size < sizeof(PA_SDP_HEADER)-1 || strncmp(e, PA_SDP_HEADER, sizeof(PA_SDP_HEADER)-1)
|| strcspn(e, "\r\n") != sizeof(PA_SDP_HEADER)-1) {
/* SDP header does not start with v=0[\r]\n */
pa_log_warn("Invalid SDP header.");
goto fail;
}

31
src/modules/rtp/sdp.c
View file

@ -73,7 +73,7 @@ char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, u
pa_assert_se(inet_ntop(af, dst, buf_dst, sizeof(buf_dst)));
return pa_sprintf_malloc(
PA_SDP_HEADER
PA_SDP_HEADER "\n"
"o=%s %lu 0 IN %s %s\n"
"s=%s\n"
"c=IN %s %s\n"
@ -130,17 +130,29 @@ pa_sdp_info *pa_sdp_parse(const char *t, pa_sdp_info *i, int is_goodbye) {
i->salen = 0;
i->payload = 255;
if (!pa_startswith(t, PA_SDP_HEADER)) {
if (pa_startswith(t, PA_SDP_HEADER)) {
t += sizeof(PA_SDP_HEADER) - 1;
/* CR delimiter is optional */
if (*t == '\r')
t++;
/* LF delimiter is mandatory */
if (*t == '\n')
t++;
else {
pa_log("Failed to parse SDP data: missing header record terminator LF.");
goto fail;
}
} else {
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");
l = strcspn(t, "\r\n");
if (l <= 2) {
pa_log("Failed to parse SDP data: line too short: >%s<.", t);
@ -240,8 +252,17 @@ pa_sdp_info *pa_sdp_parse(const char *t, pa_sdp_info *i, int is_goodbye) {
t += l;
/* CR delimiter is optional */
if (*t == '\r')
t++;
/* LF delimiter is mandatory */
if (*t == '\n')
t++;
else {
pa_log("Failed to parse SDP data: missing record terminator LF.");
goto fail;
}
}
if (!i->origin || (!is_goodbye && (!i->salen || i->payload > 127 || !ss_valid || port == 0))) {

2
src/modules/rtp/sdp.h
View file

@ -26,7 +26,7 @@
#include <pulse/sample.h>
#define PA_SDP_HEADER "v=0\n"
#define PA_SDP_HEADER "v=0"
typedef struct pa_sdp_info {
char *origin;