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