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My girl would be so proud of me

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This commit is contained in:
XANTRONIX 2019-01-24 01:55:31 -06:00
parent f70d13c541
commit bb0363a1a2
1 changed files with 80 additions and 31 deletions
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111
examples/pcapread.c
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@ -23,10 +23,10 @@ static void usage(int argc, char **argv, const char *message, ...) {
exit(1);
}
static ssize_t handle_options(hexagram_pcapng_stream *stream,
uint32_t type,
uint16_t code,
uint16_t len) {
static ssize_t handle_option(hexagram_pcapng_stream *stream,
uint32_t type,
uint16_t code,
uint16_t len) {
ssize_t readlen;
uint8_t data[65535];
@ -50,40 +50,59 @@ error_io:
return -1;
}
static ssize_t handle_block(hexagram_pcapng_stream *stream,
uint32_t type,
size_t len) {
hexagram_pcapng_packet header;
uint8_t body[65535];
static ssize_t handle_block_if(hexagram_pcapng_stream *stream,
uint32_t type,
size_t len) {
hexagram_pcapng_if iface;
ssize_t readlen,
total = 0;
size_t remaining = len;
ssize_t total = 0,
readlen;
/*
* If we've received anything other than a packet block, then seek past
* that data and move on.
* Read the interface block header.
*/
if (type != HEXAGRAM_PCAPNG_BLOCK_PACKET) {
printf("Read block type %08"PRIx32" len %zu\n",
type, len);
if ((readlen = read(stream->fd, &iface, sizeof(iface))) < 0) {
stream->error = HEXAGRAM_PCAPNG_ERROR_IO;
if ((readlen = lseek(stream->fd, len, SEEK_CUR)) < 0) {
perror("lseek()");
goto error_io;
}
return readlen;
goto error_io;
} else {
remaining -= readlen;
total += readlen;
}
if ((readlen = hexagram_pcapng_read_options(stream, handle_option, type, remaining)) < 0) {
stream->error = HEXAGRAM_PCAPNG_ERROR_IO;
goto error_io;
} else {
total += readlen;
}
return total;
error_io:
return -1;
}
static ssize_t handle_block_packet(hexagram_pcapng_stream *stream,
uint32_t type,
size_t len) {
hexagram_pcapng_packet header;
uint8_t body[65535];
ssize_t readlen,
total = 0;
size_t remaining = len;
/*
* Otherwise, read the packet block header so that we may determine the
* size of the payload to continue to read.
* Read the packet block header so that we may determine the size of the
* payload to continue to read.
*/
if ((readlen = read(stream->fd, &header, sizeof(header))) < 0) {
perror("read()");
stream->error = HEXAGRAM_PCAPNG_ERROR_IO;
goto error_io;
} else {
@ -95,7 +114,7 @@ static ssize_t handle_block(hexagram_pcapng_stream *stream,
* Read the packet body into our scratchpad.
*/
if ((readlen = read(stream->fd, &body, header.caplen)) < 0) {
perror("read()");
stream->error = HEXAGRAM_PCAPNG_ERROR_IO;
goto error_io;
} else {
@ -110,7 +129,7 @@ static ssize_t handle_block(hexagram_pcapng_stream *stream,
size_t padding = sizeof(uint32_t) - (header.caplen % sizeof(uint32_t));
if (lseek(stream->fd, padding, SEEK_CUR) < 0) {
perror("lseek()");
stream->error = HEXAGRAM_PCAPNG_ERROR_IO;
goto error_io;
} else {
@ -123,10 +142,12 @@ static ssize_t handle_block(hexagram_pcapng_stream *stream,
* The remaining data here should be pcapng option values, and since we do
* not presently require them, we can safely seek past them.
*/
if ((readlen = hexagram_pcapng_read_options(stream, handle_options, type, remaining)) < 0) {
if (lseek(stream->fd, remaining, SEEK_CUR) < 0) {
stream->error = HEXAGRAM_PCAPNG_ERROR_IO;
goto error_io;
} else {
total += readlen;
total += remaining;
}
stream->error = HEXAGRAM_PCAPNG_ERROR_OK;
@ -139,6 +160,34 @@ error_io:
return -1;
}
static ssize_t handle_block(hexagram_pcapng_stream *stream,
uint32_t type,
size_t len) {
switch (type) {
case HEXAGRAM_PCAPNG_BLOCK_IF:
return handle_block_if(stream, type, len);
case HEXAGRAM_PCAPNG_BLOCK_PACKET:
return handle_block_packet(stream, type, len);
default: break;
}
printf("Read block type %08"PRIx32" len %zu\n",
type, len);
if (lseek(stream->fd, len, SEEK_CUR) < 0) {
stream->error = HEXAGRAM_PCAPNG_ERROR_IO;
goto error_io;
}
return len;
error_io:
return -1;
}
int main(int argc, char **argv) {
int fd;
hexagram_pcapng_stream *stream;