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initial version, copy-pasted from janus rtcp.c/rtcp.h
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#include <stdlib.h> | ||
#include <stdint.h> | ||
#include <arpa/inet.h> | ||
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/*! \brief RTCP Packet Types (http://www.networksorcery.com/enp/protocol/rtcp.htm) */ | ||
typedef enum { | ||
RTCP_FIR = 192, | ||
RTCP_SR = 200, | ||
RTCP_RR = 201, | ||
RTCP_SDES = 202, | ||
RTCP_BYE = 203, | ||
RTCP_APP = 204, | ||
RTCP_RTPFB = 205, | ||
RTCP_PSFB = 206, | ||
RTCP_XR = 207, | ||
} rtcp_type; | ||
typedef rtcp_type janus_rtcp_type; | ||
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/*! \brief RTCP Header (http://tools.ietf.org/html/rfc3550#section-6.1) */ | ||
typedef struct rtcp_header | ||
{ | ||
#if __BYTE_ORDER == __BIG_ENDIAN | ||
uint16_t version:2; | ||
uint16_t padding:1; | ||
uint16_t rc:5; | ||
uint16_t type:8; | ||
#elif __BYTE_ORDER == __LITTLE_ENDIAN | ||
uint16_t rc:5; | ||
uint16_t padding:1; | ||
uint16_t version:2; | ||
uint16_t type:8; | ||
#endif | ||
uint16_t length:16; | ||
} rtcp_header; | ||
typedef rtcp_header janus_rtcp_header; | ||
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/*! \brief RTCP REMB (http://tools.ietf.org/html/draft-alvestrand-rmcat-remb-03) */ | ||
typedef struct rtcp_remb | ||
{ | ||
/*! \brief Unique identifier ('R' 'E' 'M' 'B') */ | ||
char id[4]; | ||
/*! \brief Num SSRC, Br Exp, Br Mantissa (bit mask) */ | ||
uint32_t bitrate; | ||
/*! \brief SSRC feedback (we expect at max three SSRCs in there) */ | ||
uint32_t ssrc[3]; | ||
} rtcp_remb; | ||
typedef rtcp_remb janus_rtcp_fb_remb; | ||
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/*! \brief RTCP-FB (http://tools.ietf.org/html/rfc4585) */ | ||
typedef struct rtcp_fb | ||
{ | ||
/*! \brief Common header */ | ||
rtcp_header header; | ||
/*! \brief Sender SSRC */ | ||
uint32_t ssrc; | ||
/*! \brief Media source */ | ||
uint32_t media; | ||
/*! \brief Feedback Control Information */ | ||
char fci[1]; | ||
} rtcp_fb; | ||
typedef rtcp_fb janus_rtcp_fb; | ||
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/* Query an existing REMB message */ | ||
uint32_t janus_rtcp_get_remb(char *packet, int len) { | ||
if(packet == NULL || len == 0) | ||
return 0; | ||
janus_rtcp_header *rtcp = (janus_rtcp_header *)packet; | ||
if(rtcp->version != 2) | ||
return 0; | ||
/* Get REMB bitrate, if any */ | ||
int total = len; | ||
while(rtcp) { | ||
if(rtcp->type == RTCP_PSFB) { | ||
int fmt = rtcp->rc; | ||
if(fmt == 15) { | ||
janus_rtcp_fb *rtcpfb = (janus_rtcp_fb *)rtcp; | ||
janus_rtcp_fb_remb *remb = (janus_rtcp_fb_remb *)rtcpfb->fci; | ||
if(remb->id[0] == 'R' && remb->id[1] == 'E' && remb->id[2] == 'M' && remb->id[3] == 'B') { | ||
/* FIXME From rtcp_utility.cc */ | ||
unsigned char *_ptrRTCPData = (unsigned char *)remb; | ||
_ptrRTCPData += 4; /* Skip unique identifier and num ssrc */ | ||
//~ JANUS_LOG(LOG_VERB, " %02X %02X %02X %02X\n", _ptrRTCPData[0], _ptrRTCPData[1], _ptrRTCPData[2], _ptrRTCPData[3]); | ||
uint8_t brExp = (_ptrRTCPData[1] >> 2) & 0x3F; | ||
uint32_t brMantissa = (_ptrRTCPData[1] & 0x03) << 16; | ||
brMantissa += (_ptrRTCPData[2] << 8); | ||
brMantissa += (_ptrRTCPData[3]); | ||
uint32_t bitrate = brMantissa << brExp; | ||
// JANUS_LOG(LOG_HUGE, "Got REMB bitrate %"SCNu32"\n", bitrate); | ||
return bitrate; | ||
} | ||
} | ||
} | ||
/* Is this a compound packet? */ | ||
int length = ntohs(rtcp->length); | ||
if(length == 0) | ||
break; | ||
total -= length*4+4; | ||
if(total <= 0) | ||
break; | ||
rtcp = (janus_rtcp_header *)((uint32_t*)rtcp + length + 1); | ||
} | ||
return 0; | ||
} | ||
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// clang -g -fsanitize=address,fuzzer jrtcp.c -o jrtcp | ||
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { | ||
janus_rtcp_get_remb((char *) data, size); | ||
return 0; | ||
} |