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/*
* Traceroute using libevent, libdnet and libpcap
*
* 2012 Laurent Ghigonis <laurent@p1sec.com>
*
* Inspired from jtrace (http://monkey.org/~jose/software/jtrace/)
* Copyright (c) 2003-2004 Jose Nazario <jose@monkey.org>
* All rights reserved.
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "libggnet_traceroute.h"
static void _req_free(struct ggnet_traceroute_req *);
static void _cb_recv(evutil_socket_t, short, void *);
static void _cb_send(evutil_socket_t, short, void *);
static int pcap_dloff(pcap_t *); // XXX move to libggnet_utils ?
struct ggnet_traceroute *
ggnet_traceroute_new(struct event_base *ev_base, char *iface)
{
struct ggnet_traceroute *ggtr;
char ebuff[PCAP_ERRBUF_SIZE];
ggtr = calloc(1, sizeof(struct ggnet_traceroute));
if (!ggtr) {
printf("could not allocate ggnet_traceroute\n");
exit(1);
}
ggtr->ev_base = ev_base;
ggtr->pkt_ip = ip_open();
if (!ggtr->pkt_ip) {
printf("ip_open() failed\n");
ggnet_traceroute_free(ggtr);
return NULL;
}
ggtr->pkt_rand = rand_open();
/* XXX get iface from route_open, route_get and pcap_lookupnet.
* will need to do so in ggnet_traceroute_trace() so user privs, so will need
* to prefetch the routes / interfaces, maybe */
ggtr->pcap = pcap_open_live(iface, 1500, 1, 500, ebuff);
if (ggtr->pcap == NULL)
err(1, "pcap_open_live()");
ggtr->pcap_dllen = pcap_dloff(ggtr->pcap);
ggtr->pcap_fd = pcap_fileno(ggtr->pcap);
return ggtr;
}
void
ggnet_traceroute_free(struct ggnet_traceroute *ggtr)
{
struct ggnet_traceroute_req *req;
if (ggtr->pcap)
pcap_close(ggtr->pcap);
if (ggtr->pkt_ip)
ip_close(ggtr->pkt_ip);
if (ggtr->pkt_rand)
rand_close(ggtr->pkt_rand);
LIST_FOREACH(req, &ggtr->req_list, entry)
_req_free(req);
free(ggtr);
}
struct ggnet_traceroute_req *
ggnet_traceroute_trace(struct ggnet_traceroute *ggtr,
struct in_addr *ip,
void (*cb_usr)(struct in_addr *, struct ggnet_traceroute_req *, void *),
void *data)
{
struct ggnet_traceroute_req *req;
req = calloc(1, sizeof(struct ggnet_traceroute_req));
if (!req) {
printf("could not allocate ggnet_traceroute_req\n");
exit(1);
}
addr_aton("127.0.0.1", &req->srcip);
addr_aton("127.0.0.1", &req->ip);
req->ev_recv = event_new(ggtr->ev_base,
ggtr->pcap_fd, EV_READ, _cb_recv, req);
event_add(req->ev_recv, NULL);
req->ev_send = event_new(ggtr->ev_base,
ggtr->pcap_fd, EV_WRITE, _cb_send, req);
event_add(req->ev_send, NULL);
LIST_INSERT_HEAD(&ggtr->req_list, req, entry);
return req;
}
void
ggnet_traceroute_cancel(struct ggnet_traceroute *ggtr,
struct ggnet_traceroute_req *req)
{
LIST_REMOVE(req, entry);
ggtr->req_pending--;
_req_free(req);
}
static void
_req_free(struct ggnet_traceroute_req *req)
{
if (req->ev_recv)
event_free(req->ev_recv);
if (req->ev_send)
event_free(req->ev_send);
free(req);
}
static void
_cb_recv(evutil_socket_t fd, short what, void *arg)
{
struct ggnet_traceroute_req *req;
req = arg;
printf("cbggnet_traceroute cb_recv %s\n", addr_ntoa(&req->ip));
}
static void
_cb_send(evutil_socket_t fd, short what, void *arg)
{
struct ggnet_traceroute_req *req;
req = arg;
printf("cbggnet_traceroute cb_send %s\n", addr_ntoa(&req->ip));
}
static int
pcap_dloff(pcap_t *pd)
{
int i;
i = pcap_datalink(pd);
switch (i) {
case DLT_EN10MB:
i = 14;
break;
case DLT_IEEE802:
i = 22;
break;
case DLT_FDDI:
i = 21;
break;
case DLT_NULL:
i = 4;
break;
default:
i = -1;
break;
}
return (i);
}
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