hostap/wlantest/readpcap.c
Jouni Malinen 0321bcdfa8 wlantest: Add radiotap header when re-writing DLT_IEEE802_11 file
When using DLT_IEEE802_11 datalink type in a pcap file, wlantest will now
add a radiotap header to the re-written pcap file to make sure all frames
in the output file will include the radiotap header.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
2013-01-17 16:31:19 +02:00

180 lines
4 KiB
C

/*
* PCAP capture file reader
* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include <pcap.h>
#include "utils/common.h"
#include "wlantest.h"
static void write_pcap_with_radiotap(struct wlantest *wt,
const u8 *data, size_t data_len)
{
struct pcap_pkthdr h;
u8 rtap[] = {
0x00 /* rev */,
0x00 /* pad */,
0x0a, 0x00, /* header len */
0x02, 0x00, 0x00, 0x00, /* present flags */
0x00, /* flags */
0x00 /* pad */
};
u8 *buf;
size_t len;
if (wt->assume_fcs)
rtap[8] |= 0x10;
os_memset(&h, 0, sizeof(h));
h.ts = wt->write_pcap_time;
len = sizeof(rtap) + data_len;
buf = os_malloc(len);
if (buf == NULL)
return;
os_memcpy(buf, rtap, sizeof(rtap));
os_memcpy(buf + sizeof(rtap), data, data_len);
h.caplen = len;
h.len = len;
pcap_dump(wt->write_pcap_dumper, &h, buf);
os_free(buf);
}
int read_cap_file(struct wlantest *wt, const char *fname)
{
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *pcap;
unsigned int count = 0;
struct pcap_pkthdr *hdr;
const u_char *data;
int res;
int dlt;
pcap = pcap_open_offline(fname, errbuf);
if (pcap == NULL) {
wpa_printf(MSG_ERROR, "Failed to read pcap file '%s': %s",
fname, errbuf);
return -1;
}
dlt = pcap_datalink(pcap);
if (dlt != DLT_IEEE802_11_RADIO && dlt != DLT_PRISM_HEADER &&
dlt != DLT_IEEE802_11) {
wpa_printf(MSG_ERROR, "Unsupported pcap datalink type: %d",
dlt);
pcap_close(pcap);
return -1;
}
wpa_printf(MSG_DEBUG, "pcap datalink type: %d", dlt);
for (;;) {
res = pcap_next_ex(pcap, &hdr, &data);
if (res == -2)
break; /* No more packets */
if (res == -1) {
wpa_printf(MSG_INFO, "pcap_next_ex failure: %s",
pcap_geterr(pcap));
break;
}
if (res != 1) {
wpa_printf(MSG_INFO, "Unexpected pcap_next_ex return "
"value %d", res);
break;
}
/* Packet was read without problems */
wpa_printf(MSG_EXCESSIVE, "pcap hdr: ts=%d.%06d "
"len=%u/%u",
(int) hdr->ts.tv_sec, (int) hdr->ts.tv_usec,
hdr->caplen, hdr->len);
if (wt->write_pcap_dumper) {
wt->write_pcap_time = hdr->ts;
if (dlt == DLT_IEEE802_11)
write_pcap_with_radiotap(wt, data, hdr->caplen);
else
pcap_dump(wt->write_pcap_dumper, hdr, data);
}
if (hdr->caplen < hdr->len) {
wpa_printf(MSG_DEBUG, "pcap: Dropped incomplete frame "
"(%u/%u captured)",
hdr->caplen, hdr->len);
continue;
}
count++;
switch (dlt) {
case DLT_IEEE802_11_RADIO:
wlantest_process(wt, data, hdr->caplen);
break;
case DLT_PRISM_HEADER:
wlantest_process_prism(wt, data, hdr->caplen);
break;
case DLT_IEEE802_11:
wlantest_process_80211(wt, data, hdr->caplen);
}
}
pcap_close(pcap);
wpa_printf(MSG_DEBUG, "Read %s: %u packets", fname, count);
return 0;
}
int read_wired_cap_file(struct wlantest *wt, const char *fname)
{
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *pcap;
unsigned int count = 0;
struct pcap_pkthdr *hdr;
const u_char *data;
int res;
pcap = pcap_open_offline(fname, errbuf);
if (pcap == NULL) {
wpa_printf(MSG_ERROR, "Failed to read pcap file '%s': %s",
fname, errbuf);
return -1;
}
for (;;) {
res = pcap_next_ex(pcap, &hdr, &data);
if (res == -2)
break; /* No more packets */
if (res == -1) {
wpa_printf(MSG_INFO, "pcap_next_ex failure: %s",
pcap_geterr(pcap));
break;
}
if (res != 1) {
wpa_printf(MSG_INFO, "Unexpected pcap_next_ex return "
"value %d", res);
break;
}
/* Packet was read without problems */
wpa_printf(MSG_EXCESSIVE, "pcap hdr: ts=%d.%06d "
"len=%u/%u",
(int) hdr->ts.tv_sec, (int) hdr->ts.tv_usec,
hdr->caplen, hdr->len);
if (hdr->caplen < hdr->len) {
wpa_printf(MSG_DEBUG, "pcap: Dropped incomplete frame "
"(%u/%u captured)",
hdr->caplen, hdr->len);
continue;
}
count++;
wlantest_process_wired(wt, data, hdr->caplen);
}
pcap_close(pcap);
wpa_printf(MSG_DEBUG, "Read %s: %u packets", fname, count);
return 0;
}