/* snifftest.c
*
* Copyright (C) 2006-2012 Sawtooth Consulting Ltd.
*
* This file is part of CyaSSL.
*
* CyaSSL 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.
*
* CyaSSL 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef _WIN32
#define CYASSL_SNIFFER
#endif
#ifndef CYASSL_SNIFFER
/* blank build */
#include <stdio.h>
#include <stdlib.h>
int main()
{
printf("do ./configure --enable-sniffer to enable build support\n");
return EXIT_SUCCESS;
}
#else
/* do a full build */
#ifdef _MSC_VER
/* builds on *nix too, for scanf device and port */
#define _CRT_SECURE_NO_WARNINGS
#endif
#include <pcap/pcap.h> /* pcap stuff */
#include <stdio.h> /* printf */
#include <stdlib.h> /* EXIT_SUCCESS */
#include <string.h> /* strcmp */
#include <signal.h> /* signal */
#include <cyassl/sniffer.h>
#ifndef _WIN32
#include <arpa/inet.h>
#endif
typedef unsigned char byte;
enum {
ETHER_IF_FRAME_LEN = 14, /* ethernet interface frame length */
NULL_IF_FRAME_LEN = 4, /* no link interface frame length */
};
pcap_t* pcap = 0;
pcap_if_t *alldevs;
static void sig_handler(const int sig)
{
printf("SIGINT handled = %d.\n", sig);
if (pcap)
pcap_close(pcap);
pcap_freealldevs(alldevs);
#ifndef _WIN32
ssl_FreeSniffer();
#endif
exit(EXIT_SUCCESS);
}
static void err_sys(const char* msg)
{
fprintf(stderr, "%s\n", msg);
exit(EXIT_FAILURE);
}
#ifdef _WIN32
#define SNPRINTF _snprintf
#else
#define SNPRINTF snprintf
#endif
static char* iptos(unsigned int addr)
{
static char output[32];
byte *p = (byte*)&addr;
SNPRINTF(output, sizeof(output), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
return output;
}
int main(int argc, char** argv)
{
int ret;
int inum;
int port;
int saveFile = 0;
int i = 0;
int frame = ETHER_IF_FRAME_LEN;
char err[PCAP_ERRBUF_SIZE];
char filter[32];
const char *server = NULL;
struct bpf_program fp;
pcap_if_t *d;
pcap_addr_t *a;
signal(SIGINT, sig_handler);
#ifndef _WIN32
ssl_InitSniffer(); /* dll load on Windows */
#endif
ssl_Trace("./tracefile.txt", err);
if (argc == 1) {
/* normal case, user chooses device and port */
if (pcap_findalldevs(&alldevs, err) == -1)
err_sys("Error in pcap_findalldevs");
for (d = alldevs; d; d=d->next) {
printf("%d. %s", ++i, d->name);
if (d->description)
printf(" (%s)\n", d->description);
else
printf(" (No description available)\n");
}
if (i == 0)
err_sys("No interfaces found! Make sure pcap or WinPcap is"
" installed correctly and you have sufficient permissions");
printf("Enter the interface number (1-%d): ", i);
scanf("%d", &inum);
if (inum < 1 || inum > i)
err_sys("Interface number out of range");
/* Jump to the selected adapter */
for (d = alldevs, i = 0; i < inum - 1; d = d->next, i++);
pcap = pcap_create(d->name, err);
if (pcap == NULL) printf("pcap_create failed %s\n", err);
/* get an IPv4 address */
for (a = d->addresses; a; a = a->next) {
switch(a->addr->sa_family)
{
case AF_INET:
server =
iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr);
printf("server = %s\n", server);
break;
default:
break;
}
}
if (server == NULL)
err_sys("Unable to get device IPv4 address");
ret = pcap_set_snaplen(pcap, 65536);
if (ret != 0) printf("pcap_set_snaplen failed %s\n", pcap_geterr(pcap));
ret = pcap_set_timeout(pcap, 1000);
if (ret != 0) printf("pcap_set_timeout failed %s\n", pcap_geterr(pcap));
ret = pcap_set_buffer_size(pcap, 1000000);
if (ret != 0)
printf("pcap_set_buffer_size failed %s\n", pcap_geterr(pcap));
ret = pcap_set_promisc(pcap, 1);
if (ret != 0) printf("pcap_set_promisc failed %s\n", pcap_geterr(pcap));
ret = pcap_activate(pcap);
if (ret != 0) printf("pcap_activate failed %s\n", pcap_geterr(pcap));
printf("Enter the port to scan: ");
scanf("%d", &port);
SNPRINTF(filter, sizeof(filter), "tcp and port %d", port);
ret = pcap_compile(pcap, &fp, filter, 0, 0);
if (ret != 0) printf("pcap_compile failed %s\n", pcap_geterr(pcap));
ret = pcap_setfilter(pcap, &fp);
if (ret != 0) printf("pcap_setfilter failed %s\n", pcap_geterr(pcap));
ret = ssl_SetPrivateKey(server, port, "../../certs/server-key.pem",
FILETYPE_PEM, NULL, err);
}
else if (argc >= 3) {
saveFile = 1;
pcap = pcap_open_offline(argv[1], err);
if (pcap == NULL) {
printf("pcap_open_offline failed %s\n", err);
ret = -1;
}
else {
/* defaults for server and port */
port = 443;
server = "127.0.0.1";
if (argc >= 4)
server = argv[3];
if (argc >= 5)
port = atoi(argv[4]);
ret = ssl_SetPrivateKey(server, port, argv[2],
FILETYPE_PEM, NULL, err);
}
}
else {
/* usage error */
printf(
"usage: ./snifftest or ./snifftest dump pemKey [server] [port]\n");
exit(EXIT_FAILURE);
}
if (ret != 0)
err_sys(err);
if (pcap_datalink(pcap) == DLT_NULL)
frame = NULL_IF_FRAME_LEN;
while (1) {
struct pcap_pkthdr header;
const unsigned char* packet = pcap_next(pcap, &header);
if (packet) {
byte data[65535];
if (header.caplen > 40) { /* min ip(20) + min tcp(20) */
packet += frame;
header.caplen -= frame;
}
else
continue;
ret = ssl_DecodePacket(packet, header.caplen, data, err);
if (ret < 0)
printf("ssl_Decode ret = %d, %s\n", ret, err);
if (ret > 0) {
data[ret] = 0;
printf("SSL App Data:%s\n", data);
}
}
else if (saveFile)
break; /* we're done reading file */
}
return EXIT_SUCCESS;
}
#endif /* full build */