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Just trundling along

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XANTRONIX Development 2019-01-20 15:55:40 -06:00
parent e7b79a7118
commit a9f5334524
1 changed files with 53 additions and 3 deletions
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56
examples/pcapread.c
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@ -24,10 +24,60 @@ static void usage(int argc, char **argv, const char *message, ...) {
}
static int handle_block(int fd, uint32_t type, size_t len) {
printf("Read block type %08"PRIx32" len %zu\n",
type, len);
hexagram_pcapng_packet header;
uint8_t packet[65535];
if (lseek(fd, len, SEEK_CUR) < 0) {
ssize_t readlen,
remaining = len;
/*
* If we've received anything other than a packet block, then seek past
* that data and move on.
*/
if (type != HEXAGRAM_PCAPNG_BLOCK_PACKET) {
printf("Read block type %08"PRIx32" len %zu\n",
type, len);
if (lseek(fd, len, SEEK_CUR) < 0) {
perror("lseek()");
goto error_io;
}
return 0;
}
/*
* Otherwise, read the packet block header so that we may determine the
* size of the payload to continue to read.
*/
if ((readlen = read(fd, &header, sizeof(header))) < 0) {
perror("read()");
goto error_io;
} else {
remaining -= readlen;
}
/*
* Read the packet data into our scratchpad.
*/
if ((readlen = read(fd, &packet, header.caplen)) < 0) {
perror("read()");
goto error_io;
} else {
remaining -= readlen;
}
printf("Read packet %"PRIu32" bytes time hi %"PRIu32" lo %"PRIu32"\n",
header.caplen, header.timestamp[0], header.timestamp[1]);
/*
* The remaining data here should be pcapng option values, and since we do
* not presently require them, we can safely seek past them.
*/
if (lseek(fd, remaining, SEEK_CUR) < 0) {
perror("lseek()");
goto error_io;