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Merge "res_rtp_asterisk: Trim trailing byte off of SDES packet"

This commit is contained in:
Joshua Colp 2017-09-28 06:45:28 -05:00 committed by Gerrit Code Review
parent a6dc0527a2 c9e972a26a
commit 4ea4364eef
1 changed files with 29 additions and 5 deletions
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34
res/res_rtp_asterisk.c
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@ -3771,6 +3771,7 @@ static int ast_rtcp_write_report(struct ast_rtp_instance *instance, int sr)
RAII_VAR(struct ast_json *, message_blob, NULL, ast_json_unref);
int res;
int len = 0;
uint16_t sdes_packet_len_bytes, sdes_packet_len_rounded;
struct timeval now;
unsigned int now_lsw;
unsigned int now_msw;
@ -3778,7 +3779,7 @@ static int ast_rtcp_write_report(struct ast_rtp_instance *instance, int sr)
unsigned int lost_packets;
int fraction_lost;
struct timeval dlsr = { 0, };
unsigned char bdata[512] = "";
unsigned char bdata[AST_UUID_STR_LEN + 128] = ""; /* More than enough */
int rate = rtp_get_rate(rtp->f.subclass.format);
int ice;
struct ast_sockaddr remote_address = { { 0, } };
@ -3858,12 +3859,35 @@ static int ast_rtcp_write_report(struct ast_rtp_instance *instance, int sr)
put_unaligned_uint32(rtcpheader, htonl((2 << 30) | (rtcp_report->reception_report_count << 24)
| ((sr ? RTCP_PT_SR : RTCP_PT_RR) << 16) | ((len/4)-1)));
put_unaligned_uint32(rtcpheader + len, htonl((2 << 30) | (1 << 24) | (RTCP_PT_SDES << 16) | (2 + (AST_UUID_STR_LEN / 4))));
sdes_packet_len_bytes =
4 + /* RTCP Header */
4 + /* SSRC */
1 + /* Type (CNAME) */
1 + /* Text Length */
AST_UUID_STR_LEN /* Text and NULL terminator */
;
/* Round to 32 bit boundary */
sdes_packet_len_rounded = (sdes_packet_len_bytes + 3) & ~0x3;
put_unaligned_uint32(rtcpheader + len, htonl((2 << 30) | (1 << 24) | (RTCP_PT_SDES << 16) | ((sdes_packet_len_rounded / 4) - 1)));
put_unaligned_uint32(rtcpheader + len + 4, htonl(rtcp_report->ssrc));
put_unaligned_uint16(rtcpheader + len + 8, htonl(0x01 << 24));
put_unaligned_uint16(rtcpheader + len + 9, htonl(AST_UUID_STR_LEN << 24));
rtcpheader[len + 8] = 0x01; /* CNAME */
rtcpheader[len + 9] = AST_UUID_STR_LEN - 1; /* Number of bytes of text */
memcpy(rtcpheader + len + 10, rtp->cname, AST_UUID_STR_LEN);
len += 12 + AST_UUID_STR_LEN;
len += 10 + AST_UUID_STR_LEN;
/* Padding - Note that we don't set the padded bit on the packet. From
* RFC 3550 Section 6.5:
*
* No length octet follows the null item type octet, but additional null
* octets MUST be included if needed to pad until the next 32-bit
* boundary. Note that this padding is separate from that indicated by
* the P bit in the RTCP header.
*
* These bytes will already be zeroed out during array initialization.
*/
len += (sdes_packet_len_rounded - sdes_packet_len_bytes);
if (rtp->bundled) {
ast_rtp_instance_get_remote_address(instance, &remote_address);