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/*
* (C) 2012 by Pablo Neira Ayuso <pablo@gnumonks.org>
* (C) 2012 by On Waves ehf <http://www.on-waves.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdio.h>
#include <pcap.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <string.h>
#include <dlfcn.h>
#include <unistd.h>
#include <sys/time.h>
#include <linux/if_ether.h>
#include "proto.h"
#include "osmo_pcap.h"
#include <osmocom/core/msgb.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/timer_compat.h>
#include <osmocom/core/select.h>
#include <osmocom/netif/osmux.h>
struct osmo_pcap_test_stats {
uint32_t pkts;
uint32_t skip;
uint32_t processed;
uint32_t unsupported_l2;
uint32_t unsupported_l3;
uint32_t unsupported_l4;
} osmo_pcap_test_stats;
static int
osmo_pcap_process_packet(struct msgb **msgptr,
const uint8_t *pkt, uint32_t pktlen,
struct osmo_pcap_proto_l2 *l2h,
struct osmo_pcap_proto_l3 *l3h,
struct osmo_pcap_proto_l4 *l4h,
int (*cb)(struct msgb *msgb))
{
unsigned int l2hdr_len, l3hdr_len, skip_hdr_len;
struct msgb *msgb;
/* skip layer 2, 3 and 4 headers */
l2hdr_len = l2h->l2pkt_hdr_len(pkt);
l3hdr_len = l3h->l3pkt_hdr_len(pkt + l2hdr_len);
skip_hdr_len = l2hdr_len + l3hdr_len +
l4h->l4pkt_hdr_len(pkt + l2hdr_len + l3hdr_len);
/* This packet contains no data, skip it. */
if (l4h->l4pkt_no_data(pkt + l2hdr_len + l3hdr_len)) {
osmo_pcap_test_stats.skip++;
return -1;
}
/* get application layer data. */
pkt += skip_hdr_len;
pktlen -= skip_hdr_len;
/* Create the fake network buffer. */
msgb = msgb_alloc(pktlen, "OSMO/PCAP test");
if (msgb == NULL) {
fprintf(stderr, "Not enough memory\n");
return -1;
}
memcpy(msgb->data, pkt, pktlen);
msgb_put(msgb, pktlen);
*msgptr = msgb;
return 0;
}
pcap_t *osmo_pcap_test_open(const char *pcapfile)
{
pcap_t *handle;
char errbuf[PCAP_ERRBUF_SIZE];
handle = pcap_open_offline(pcapfile, errbuf);
if (handle == NULL) {
fprintf(stderr, "couldn't open pcap file %s: %s\n",
pcapfile, errbuf);
return NULL;
}
return handle;
}
void osmo_pcap_test_close(pcap_t *handle)
{
pcap_close(handle);
}
int
osmo_pcap_test_run(struct osmo_pcap *p, uint8_t pnum, int (*cb)(struct msgb *msgb))
{
struct osmo_pcap_proto_l2 *l2h;
struct osmo_pcap_proto_l3 *l3h;
struct osmo_pcap_proto_l4 *l4h;
struct pcap_pkthdr pcaph;
const u_char *l2pkt, *l3pkt;
struct timespec now_ts, elapsed_sys_ts;
struct timeval res, elapsed_pcap, elapsed_sys;
uint8_t l4protonum;
if (p->deliver_msg) {
if (cb(p->deliver_msg) == 0)
osmo_pcap_test_stats.processed++;
p->deliver_msg = 0;
}
retry:
l2pkt = pcap_next(p->h, &pcaph);
if (l2pkt == NULL)
return -1;
osmo_pcap_test_stats.pkts++;
int linktype = pcap_datalink(p->h);
l2h = osmo_pcap_proto_l2_find(linktype);
if (l2h == NULL) {
osmo_pcap_test_stats.unsupported_l2++;
goto retry;
}
l3h = osmo_pcap_proto_l3_find(l2h->l3pkt_proto(l2pkt));
if (l3h == NULL) {
osmo_pcap_test_stats.unsupported_l3++;
goto retry;
}
l3pkt = l2pkt + l2h->l2pkt_hdr_len(l2pkt);
l4protonum = l3h->l4pkt_proto(l3pkt);
/* filter l4 protocols we are not interested in */
if (l4protonum != pnum) {
osmo_pcap_test_stats.skip++;
goto retry;
}
l4h = osmo_pcap_proto_l4_find(l4protonum);
if (l4h == NULL) {
osmo_pcap_test_stats.unsupported_l4++;
goto retry;
}
/* first packet that is going to be processed */
if (osmo_pcap_test_stats.processed == 0) {
if (clock_gettime(CLOCK_MONOTONIC, &p->start_sys) < 0)
return -1;
memcpy(&p->start_pcap, &pcaph.ts, sizeof(struct timeval));
}
/* retry with next packet if this has been skipped. */
if (osmo_pcap_process_packet(&p->deliver_msg, l2pkt, pcaph.caplen, l2h, l3h, l4h, cb) < 0)
goto retry;
/* calculate waiting time */
timersub(&pcaph.ts, &p->start_pcap, &elapsed_pcap);
if (clock_gettime(CLOCK_MONOTONIC, &now_ts) < 0)
return -1;
timespecsub(&now_ts, &p->start_sys, &elapsed_sys_ts);
elapsed_sys.tv_sec = elapsed_sys_ts.tv_sec;
elapsed_sys.tv_usec = elapsed_sys_ts.tv_nsec / 1000;
if (timercmp(&elapsed_sys, &elapsed_pcap, >)) {
printf("We are late!\n");
res.tv_sec = 0;
res.tv_usec = 0;
} else {
timersub(&elapsed_pcap, &elapsed_sys, &res);
}
printf("next packet comes in %lu.%.6lu seconds\n",
res.tv_sec, res.tv_usec);
osmo_timer_schedule(&p->timer, res.tv_sec, res.tv_usec);
return 0;
}
void osmo_pcap_stats_printf(void)
{
printf("pkts=%d processed=%d skip=%d unsupported_l2=%d "
"unsupported_l3=%d unsupported_l4=%d\n",
osmo_pcap_test_stats.pkts,
osmo_pcap_test_stats.processed,
osmo_pcap_test_stats.skip,
osmo_pcap_test_stats.unsupported_l2,
osmo_pcap_test_stats.unsupported_l3,
osmo_pcap_test_stats.unsupported_l4);
}
void osmo_pcap_init(void)
{
/* Initialization of supported layer 2, 3 and 4 protocols here. */
l2_eth_init();
l2_sll_init();
l3_ipv4_init();
l4_tcp_init();
l4_udp_init();
}
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