STATIC_INLINE VC_CONTAINER_STATUS_T ps_find_start_code( VC_CONTAINER_T *ctx, uint8_t *buffer )
{
unsigned int i;
/* Scan for a pack or PES packet start code prefix */
for (i = 0; i < PS_SYNC_FAIL_MAX; ++i)
{
if(PEEK_BYTES(ctx, buffer, 4) < 4)
return VC_CONTAINER_ERROR_EOS;
if(buffer[0] == 0x0 && buffer[1] == 0x0 && buffer[2] == 0x1 && buffer[3] >= 0xB9)
break;
if (SKIP_BYTES(ctx, 1) != 1)
return VC_CONTAINER_ERROR_EOS;
}
if(i == PS_SYNC_FAIL_MAX) /* We didn't find a valid pack or PES packet */
return VC_CONTAINER_ERROR_FORMAT_NOT_SUPPORTED;
if (buffer[3] == 0xB9) /* MPEG_program_end_code */
return VC_CONTAINER_ERROR_EOS;
return VC_CONTAINER_SUCCESS;
}
static VC_CONTAINER_STATUS_T rv9_read_file_header(VC_CONTAINER_T *p_ctx,
VC_CONTAINER_TRACK_T *track)
{
VC_CONTAINER_STATUS_T status;
VC_CONTAINER_FOURCC_T codec;
uint8_t dummy[12];
uint32_t length;
if(PEEK_BYTES(p_ctx, dummy, sizeof(dummy)) != sizeof(dummy)) return VC_CONTAINER_ERROR_EOS;
length = BI32(dummy);
if(length < 12 || length > 1024) return VC_CONTAINER_ERROR_FORMAT_NOT_SUPPORTED;
if(dummy[4] != 'V' || dummy[5] != 'I' || dummy[6] != 'D' || dummy[7] != 'O' ||
dummy[8] != 'R' || dummy[9] != 'V' || dummy[11] != '0')
return VC_CONTAINER_ERROR_FORMAT_NOT_SUPPORTED;
switch(dummy[10]) {
case '4': codec = VC_CONTAINER_CODEC_RV40; break;
case '3': codec = VC_CONTAINER_CODEC_RV30; break;
case '2': codec = VC_CONTAINER_CODEC_RV20; break;
case '1': codec = VC_CONTAINER_CODEC_RV10; break;
default: return VC_CONTAINER_ERROR_FORMAT_NOT_SUPPORTED;
}
if (!track)
return VC_CONTAINER_SUCCESS;
status = vc_container_track_allocate_extradata(p_ctx, track, length);
if(status != VC_CONTAINER_SUCCESS) return status;
if(READ_BYTES(p_ctx, track->format->extradata, length) != length) return VC_CONTAINER_ERROR_EOS;
track->format->extradata_size = length;
track->format->codec = codec;
return STREAM_STATUS(p_ctx);
}
/* cdp_decode also decodes FDP */
int
cdp_decode(struct lldpd *cfg, char *frame, int s,
struct lldpd_hardware *hardware,
struct lldpd_chassis **newchassis, struct lldpd_port **newport)
{
struct lldpd_chassis *chassis;
struct lldpd_port *port;
#if 0
u_int16_t cksum;
#endif
u_int8_t *software = NULL, *platform = NULL;
int software_len = 0, platform_len = 0, proto, version, nb, caps;
const unsigned char cdpaddr[] = CDP_MULTICAST_ADDR;
#ifdef ENABLE_FDP
const unsigned char fdpaddr[] = CDP_MULTICAST_ADDR;
int fdp = 0;
#endif
u_int8_t *pos, *tlv, *pos_address, *pos_next_address;
int length, len_eth, tlv_type, tlv_len, addresses_len, address_len;
if ((chassis = calloc(1, sizeof(struct lldpd_chassis))) == NULL) {
LLOG_WARN("failed to allocate remote chassis");
return -1;
}
if ((port = calloc(1, sizeof(struct lldpd_port))) == NULL) {
LLOG_WARN("failed to allocate remote port");
free(chassis);
return -1;
}
#ifdef ENABLE_DOT1
TAILQ_INIT(&port->p_vlans);
#endif
length = s;
pos = (u_int8_t*)frame;
if (length < 2*ETH_ALEN + sizeof(u_int16_t) /* Ethernet */ +
8 /* LLC */ + 4 /* CDP header */) {
LLOG_WARNX("too short CDP/FDP frame received on %s", hardware->h_ifname);
goto malformed;
}
if (PEEK_CMP(cdpaddr, sizeof(cdpaddr)) != 0) {
#ifdef ENABLE_FDP
PEEK_RESTORE((u_int8_t*)frame);
if (PEEK_CMP(fdpaddr, sizeof(fdpaddr)) != 0)
fdp = 1;
else {
#endif
LLOG_INFO("frame not targeted at CDP/FDP multicast address received on %s",
hardware->h_ifname);
goto malformed;
#ifdef ENABLE_FDP
}
#endif
}
PEEK_DISCARD(ETH_ALEN); /* Don't care of source address */
len_eth = PEEK_UINT16;
if (len_eth > length) {
LLOG_WARNX("incorrect 802.3 frame size reported on %s",
hardware->h_ifname);
goto malformed;
}
PEEK_DISCARD(6); /* Skip beginning of LLC */
proto = PEEK_UINT16;
if (proto != LLC_PID_CDP) {
if ((proto != LLC_PID_DRIP) &&
(proto != LLC_PID_PAGP) &&
(proto != LLC_PID_PVSTP) &&
(proto != LLC_PID_UDLD) &&
(proto != LLC_PID_VTP) &&
(proto != LLC_PID_DTP) &&
(proto != LLC_PID_STP))
LLOG_DEBUG("incorrect LLC protocol ID received on %s",
hardware->h_ifname);
goto malformed;
}
#if 0
/* Check checksum */
cksum = frame_checksum(pos, len_eth - 8,
#ifdef ENABLE_FDP
!fdp /* fdp = 0 -> cisco checksum */
#else
1 /* cisco checksum */
#endif
);
/* An off-by-one error may happen. Just ignore it */
if ((cksum != 0) && (cksum != 0xfffe)) {
LLOG_INFO("incorrect CDP/FDP checksum for frame received on %s (%d)",
hardware->h_ifname, cksum);
goto malformed;
}
#endif
/* Check version */
version = PEEK_UINT8;
if ((version != 1) && (version != 2)) {
LLOG_WARNX("incorrect CDP/FDP version (%d) for frame received on %s",
version, hardware->h_ifname);
goto malformed;
}
chassis->c_ttl = PEEK_UINT8; /* TTL */
PEEK_DISCARD_UINT16; /* Checksum, already checked */
while (length) {
if (length < 4) {
LLOG_WARNX("CDP/FDP TLV header is too large for "
"frame received on %s",
hardware->h_ifname);
goto malformed;
}
tlv_type = PEEK_UINT16;
tlv_len = PEEK_UINT16 - 4;
PEEK_SAVE(tlv);
if ((tlv_len < 0) || (length < tlv_len)) {
LLOG_WARNX("incorrect size in CDP/FDP TLV header for frame "
"received on %s",
hardware->h_ifname);
goto malformed;
}
switch (tlv_type) {
case CDP_TLV_CHASSIS:
if ((chassis->c_name = (char *)calloc(1, tlv_len + 1)) == NULL) {
LLOG_WARN("unable to allocate memory for chassis name");
goto malformed;
}
PEEK_BYTES(chassis->c_name, tlv_len);
chassis->c_id_subtype = LLDP_CHASSISID_SUBTYPE_LOCAL;
if ((chassis->c_id = (char *)malloc(tlv_len)) == NULL) {
LLOG_WARN("unable to allocate memory for chassis ID");
goto malformed;
}
memcpy(chassis->c_id, chassis->c_name, tlv_len);
chassis->c_id_len = tlv_len;
break;
case CDP_TLV_ADDRESSES:
CHECK_TLV_SIZE(4, "Address");
addresses_len = tlv_len - 4;
for (nb = PEEK_UINT32; nb > 0; nb--) {
PEEK_SAVE(pos_address);
/* We first try to get the real length of the packet */
if (addresses_len < 2) {
LLOG_WARN("too short address subframe "
"received on %s",
hardware->h_ifname);
goto malformed;
}
PEEK_DISCARD_UINT8; addresses_len--;
address_len = PEEK_UINT8; addresses_len--;
if (addresses_len < address_len + 2) {
LLOG_WARN("too short address subframe "
"received on %s",
hardware->h_ifname);
goto malformed;
}
PEEK_DISCARD(address_len);
addresses_len -= address_len;
address_len = PEEK_UINT16; addresses_len -= 2;
if (addresses_len < address_len) {
LLOG_WARN("too short address subframe "
"received on %s",
hardware->h_ifname);
goto malformed;
}
PEEK_DISCARD(address_len);
PEEK_SAVE(pos_next_address);
/* Next, we go back and try to extract
IPv4 address */
PEEK_RESTORE(pos_address);
if ((PEEK_UINT8 == 1) && (PEEK_UINT8 == 1) &&
(PEEK_UINT8 == CDP_ADDRESS_PROTO_IP) &&
(PEEK_UINT16 == sizeof(struct in_addr)) &&
(chassis->c_mgmt.s_addr == INADDR_ANY))
PEEK_BYTES(&chassis->c_mgmt,
sizeof(struct in_addr));
/* Go to the end of the address */
PEEK_RESTORE(pos_next_address);
}
break;
case CDP_TLV_PORT:
if ((port->p_descr = (char *)calloc(1, tlv_len + 1)) == NULL) {
LLOG_WARN("unable to allocate memory for port description");
goto malformed;
}
PEEK_BYTES(port->p_descr, tlv_len);
port->p_id_subtype = LLDP_PORTID_SUBTYPE_IFNAME;
if ((port->p_id = (char *)calloc(1, tlv_len)) == NULL) {
LLOG_WARN("unable to allocate memory for port ID");
goto malformed;
}
memcpy(port->p_id, port->p_descr, tlv_len);
port->p_id_len = tlv_len;
break;
case CDP_TLV_CAPABILITIES:
#ifdef ENABLE_FDP
if (fdp) {
/* Capabilities are string with FDP */
if (!strncmp("Router", (char*)pos, tlv_len))
chassis->c_cap_enabled = LLDP_CAP_ROUTER;
else if (!strncmp("Switch", (char*)pos, tlv_len))
chassis->c_cap_enabled = LLDP_CAP_BRIDGE;
else if (!strncmp("Bridge", (char*)pos, tlv_len))
chassis->c_cap_enabled = LLDP_CAP_REPEATER;
else
chassis->c_cap_enabled = LLDP_CAP_STATION;
chassis->c_cap_available = chassis->c_cap_enabled;
break;
}
#endif
CHECK_TLV_SIZE(4, "Capabilities");
caps = PEEK_UINT32;
if (caps & CDP_CAP_ROUTER)
chassis->c_cap_enabled |= LLDP_CAP_ROUTER;
if (caps & 0x0e)
chassis->c_cap_enabled |= LLDP_CAP_BRIDGE;
if (chassis->c_cap_enabled == 0)
chassis->c_cap_enabled = LLDP_CAP_STATION;
chassis->c_cap_available = chassis->c_cap_enabled;
break;
case CDP_TLV_SOFTWARE:
software_len = tlv_len;
PEEK_SAVE(software);
break;
case CDP_TLV_PLATFORM:
platform_len = tlv_len;
PEEK_SAVE(platform);
break;
default:
LLOG_DEBUG("unknown CDP/FDP TLV type (%d) received on %s",
ntohs(tlv_type), hardware->h_ifname);
hardware->h_rx_unrecognized_cnt++;
}
PEEK_DISCARD(tlv + tlv_len - pos);
}
if (!software && platform) {
if ((chassis->c_descr = (char *)calloc(1,
platform_len + 1)) == NULL) {
LLOG_WARN("unable to allocate memory for chassis description");
goto malformed;
}
memcpy(chassis->c_descr, platform, platform_len);
} else if (software && !platform) {
if ((chassis->c_descr = (char *)calloc(1,
software_len + 1)) == NULL) {
LLOG_WARN("unable to allocate memory for chassis description");
goto malformed;
}
memcpy(chassis->c_descr, software, software_len);
} else if (software && platform) {
#define CONCAT_PLATFORM " running on\n"
if ((chassis->c_descr = (char *)calloc(1,
software_len + platform_len +
strlen(CONCAT_PLATFORM) + 1)) == NULL) {
LLOG_WARN("unable to allocate memory for chassis description");
goto malformed;
}
memcpy(chassis->c_descr, platform, platform_len);
memcpy(chassis->c_descr + platform_len,
CONCAT_PLATFORM, strlen(CONCAT_PLATFORM));
memcpy(chassis->c_descr + platform_len + strlen(CONCAT_PLATFORM),
software, software_len);
}
if ((chassis->c_id == NULL) ||
(port->p_id == NULL) ||
(chassis->c_name == NULL) ||
(chassis->c_descr == NULL) ||
(port->p_descr == NULL) ||
(chassis->c_ttl == 0) ||
(chassis->c_cap_enabled == 0)) {
LLOG_WARNX("some mandatory CDP/FDP tlv are missing for frame received on %s",
hardware->h_ifname);
goto malformed;
}
*newchassis = chassis;
*newport = port;
return 1;
malformed:
lldpd_chassis_cleanup(chassis, 1);
lldpd_port_cleanup(cfg, port, 1);
free(port);
return -1;
}
