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/* PCAP code from OpenBSC done by Holger Freyther */
/*
* (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by On-Waves
* All Rights Reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <mtp_pcap.h>
#include <sys/time.h>
#include <unistd.h>
#define static_assert(exp, name) typedef int dummy##name [(exp) ? 1 : -1];
/*
* pcap writing of the misdn load
* pcap format is from http://wiki.wireshark.org/Development/LibpcapFileFormat
*/
struct pcap_hdr {
uint32_t magic_number;
uint16_t version_major;
uint16_t version_minor;
int32_t thiszone;
uint32_t sigfigs;
uint32_t snaplen;
uint32_t network;
} __attribute__((packed));
struct pcaprec_hdr {
uint32_t ts_sec;
uint32_t ts_usec;
uint32_t incl_len;
uint32_t orig_len;
} __attribute__((packed));
int mtp_pcap_write_header(int fd)
{
static struct pcap_hdr hdr = {
.magic_number = 0xa1b2c3d4,
.version_major = 2,
.version_minor = 4,
.thiszone = 0,
.sigfigs = 0,
.snaplen = 65535,
.network = 141,
};
return write(fd, &hdr, sizeof(hdr));
}
int mtp_pcap_write_msu(int fd, const uint8_t *data, int length)
{
int rc_h, rc_d;
struct timeval tv;
struct pcaprec_hdr payload_header = {
.ts_sec = 0,
.ts_usec = 0,
.incl_len = length,
.orig_len = length,
};
gettimeofday(&tv, NULL);
payload_header.ts_sec = tv.tv_sec;
payload_header.ts_usec = tv.tv_usec;
rc_h = write(fd, &payload_header, sizeof(payload_header));
rc_d = write(fd, data, length);
return rc_h == sizeof(payload_header) && rc_d == length;
}
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