/* Extracts DUCK information from the DAG card and produces a DUCK packet */
static int dag_get_duckinfo(libtrace_t *libtrace,
libtrace_packet_t *packet) {
dag_inf lt_dag_inf;
/* Allocate memory for the DUCK data */
if (packet->buf_control == TRACE_CTRL_EXTERNAL ||
!packet->buffer) {
packet->buffer = malloc(LIBTRACE_PACKET_BUFSIZE);
packet->buf_control = TRACE_CTRL_PACKET;
if (!packet->buffer) {
trace_set_err(libtrace, errno,
"Cannot allocate packet buffer");
return -1;
}
}
/* DUCK doesn't actually have a format header, as such */
packet->header = 0;
packet->payload = packet->buffer;
/* Check that the DAG card supports DUCK */
if ((ioctl(FORMAT_DATA->fd, DAG_IOINF, <_dag_inf) < 0)) {
trace_set_err(libtrace, errno,
"Error using DAG_IOINF");
return -1;
}
if (!IsDUCK(<_dag_inf)) {
printf("WARNING: %s does not have modern clock support - No DUCK information will be gathered\n", libtrace->uridata);
return 0;
}
/* Get the DUCK information from the card */
if ((ioctl(FORMAT_DATA->fd, DAG_IOGETDUCK, (duck_inf *)packet->payload)
< 0)) {
trace_set_err(libtrace, errno, "Error using DAG_IOGETDUCK");
return -1;
}
/* Set the type */
packet->type = TRACE_RT_DUCK_2_4;
/* Set the packet's trace to point at a DUCK trace, so that the
* DUCK format functions will be called on the packet rather than the
* DAG ones */
if (!DUCK.dummy_duck)
DUCK.dummy_duck = trace_create_dead("duck:dummy");
packet->trace = DUCK.dummy_duck;
return sizeof(duck_inf);
}
/* Sets the trace format for the packet to match the format it was originally
* captured in, rather than the RT format */
static int rt_set_format(libtrace_t *libtrace, libtrace_packet_t *packet)
{
/* We need to assign the packet to a "dead" trace */
/* Try to minimize the number of corrupt packets that slip through
* while making it easy to identify new pcap DLTs */
if (packet->type > TRACE_RT_DATA_DLT &&
packet->type < TRACE_RT_DATA_DLT_END) {
if (!RT_INFO->dummy_pcap) {
RT_INFO->dummy_pcap = trace_create_dead("pcap:-");
}
packet->trace = RT_INFO->dummy_pcap;
return 0;
}
if (packet->type > TRACE_RT_DATA_BPF &&
packet->type < TRACE_RT_DATA_BPF_END) {
if (!RT_INFO->dummy_bpf) {
RT_INFO->dummy_bpf = trace_create_dead("bpf:-");
/* This may fail on a non-BSD machine */
if (trace_is_err(RT_INFO->dummy_bpf)) {
trace_perror(RT_INFO->dummy_bpf, "Creating dead bpf trace");
return -1;
}
}
packet->trace = RT_INFO->dummy_bpf;
return 0;
}
switch (packet->type) {
case TRACE_RT_DUCK_2_4:
case TRACE_RT_DUCK_2_5:
if (!RT_INFO->dummy_duck) {
RT_INFO->dummy_duck = trace_create_dead("duck:dummy");
}
packet->trace = RT_INFO->dummy_duck;
break;
case TRACE_RT_DATA_ERF:
if (!RT_INFO->dummy_erf) {
RT_INFO->dummy_erf = trace_create_dead("erf:-");
}
packet->trace = RT_INFO->dummy_erf;
break;
case TRACE_RT_DATA_LINUX_NATIVE:
if (!RT_INFO->dummy_linux) {
RT_INFO->dummy_linux = trace_create_dead("int:");
/* This may fail on a non-Linux machine */
if (trace_is_err(RT_INFO->dummy_linux)) {
trace_perror(RT_INFO->dummy_linux, "Creating dead int trace");
return -1;
}
}
packet->trace = RT_INFO->dummy_linux;
break;
case TRACE_RT_DATA_LINUX_RING:
if (!RT_INFO->dummy_ring) {
RT_INFO->dummy_ring = trace_create_dead("ring:");
/* This may fail on a non-Linux machine */
if (trace_is_err(RT_INFO->dummy_ring)) {
trace_perror(RT_INFO->dummy_ring, "Creating dead int trace");
return -1;
}
}
packet->trace = RT_INFO->dummy_ring;
break;
case TRACE_RT_STATUS:
case TRACE_RT_METADATA:
/* Just use the RT trace! */
packet->trace = libtrace;
break;
case TRACE_RT_DATA_LEGACY_ETH:
case TRACE_RT_DATA_LEGACY_ATM:
case TRACE_RT_DATA_LEGACY_POS:
printf("Sending legacy over RT is currently not supported\n");
trace_set_err(libtrace, TRACE_ERR_BAD_PACKET, "Legacy packet cannot be sent over rt");
return -1;
default:
printf("Unrecognised format: %u\n", packet->type);
trace_set_err(libtrace, TRACE_ERR_BAD_PACKET, "Unrecognised packet format");
return -1;
}
return 0; /* success */
}
