287 lines
7.2 KiB
C
Executable File
287 lines
7.2 KiB
C
Executable File
/* snifftest.c
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*
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* Copyright (C) 2006-2012 Sawtooth Consulting Ltd.
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*
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* This file is part of CyaSSL.
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*
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* CyaSSL is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* CyaSSL 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef _WIN32
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#define CYASSL_SNIFFER
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#endif
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#ifndef CYASSL_SNIFFER
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/* blank build */
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#include <stdio.h>
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#include <stdlib.h>
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int main(void)
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{
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printf("do ./configure --enable-sniffer to enable build support\n");
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return EXIT_SUCCESS;
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}
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#else
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/* do a full build */
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#ifdef _MSC_VER
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/* builds on *nix too, for scanf device and port */
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#define _CRT_SECURE_NO_WARNINGS
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#endif
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#include <pcap/pcap.h> /* pcap stuff */
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#include <stdio.h> /* printf */
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#include <stdlib.h> /* EXIT_SUCCESS */
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#include <string.h> /* strcmp */
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#include <signal.h> /* signal */
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#include <cyassl/sniffer.h>
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#ifndef _WIN32
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#include <arpa/inet.h>
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#endif
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typedef unsigned char byte;
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enum {
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ETHER_IF_FRAME_LEN = 14, /* ethernet interface frame length */
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NULL_IF_FRAME_LEN = 4, /* no link interface frame length */
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};
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pcap_t* pcap = 0;
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pcap_if_t *alldevs;
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static void sig_handler(const int sig)
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{
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printf("SIGINT handled = %d.\n", sig);
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if (pcap)
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pcap_close(pcap);
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pcap_freealldevs(alldevs);
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#ifndef _WIN32
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ssl_FreeSniffer();
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#endif
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if (sig)
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exit(EXIT_SUCCESS);
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}
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static void err_sys(const char* msg)
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{
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fprintf(stderr, "%s\n", msg);
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if (msg)
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exit(EXIT_FAILURE);
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}
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#ifdef _WIN32
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#define SNPRINTF _snprintf
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#else
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#define SNPRINTF snprintf
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#endif
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static char* iptos(unsigned int addr)
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{
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static char output[32];
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byte *p = (byte*)&addr;
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SNPRINTF(output, sizeof(output), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]);
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return output;
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}
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int main(int argc, char** argv)
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{
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int ret;
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int inum;
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int port;
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int saveFile = 0;
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int i = 0;
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int frame = ETHER_IF_FRAME_LEN;
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char err[PCAP_ERRBUF_SIZE];
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char filter[32];
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const char *server = NULL;
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struct bpf_program fp;
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pcap_if_t *d;
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pcap_addr_t *a;
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signal(SIGINT, sig_handler);
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#ifndef _WIN32
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ssl_InitSniffer(); /* dll load on Windows */
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#endif
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ssl_Trace("./tracefile.txt", err);
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if (argc == 1) {
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/* normal case, user chooses device and port */
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if (pcap_findalldevs(&alldevs, err) == -1)
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err_sys("Error in pcap_findalldevs");
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for (d = alldevs; d; d=d->next) {
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printf("%d. %s", ++i, d->name);
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if (d->description)
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printf(" (%s)\n", d->description);
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else
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printf(" (No description available)\n");
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}
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if (i == 0)
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err_sys("No interfaces found! Make sure pcap or WinPcap is"
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" installed correctly and you have sufficient permissions");
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printf("Enter the interface number (1-%d): ", i);
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ret = scanf("%d", &inum);
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if (ret != 1)
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printf("scanf port failed\n");
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if (inum < 1 || inum > i)
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err_sys("Interface number out of range");
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/* Jump to the selected adapter */
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for (d = alldevs, i = 0; i < inum - 1; d = d->next, i++);
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pcap = pcap_create(d->name, err);
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if (pcap == NULL) printf("pcap_create failed %s\n", err);
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/* get an IPv4 address */
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for (a = d->addresses; a; a = a->next) {
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switch(a->addr->sa_family)
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{
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case AF_INET:
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server =
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iptos(((struct sockaddr_in *)a->addr)->sin_addr.s_addr);
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printf("server = %s\n", server);
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break;
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default:
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break;
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}
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}
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if (server == NULL)
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err_sys("Unable to get device IPv4 address");
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ret = pcap_set_snaplen(pcap, 65536);
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if (ret != 0) printf("pcap_set_snaplen failed %s\n", pcap_geterr(pcap));
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ret = pcap_set_timeout(pcap, 1000);
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if (ret != 0) printf("pcap_set_timeout failed %s\n", pcap_geterr(pcap));
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ret = pcap_set_buffer_size(pcap, 1000000);
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if (ret != 0)
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printf("pcap_set_buffer_size failed %s\n", pcap_geterr(pcap));
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ret = pcap_set_promisc(pcap, 1);
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if (ret != 0) printf("pcap_set_promisc failed %s\n", pcap_geterr(pcap));
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ret = pcap_activate(pcap);
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if (ret != 0) printf("pcap_activate failed %s\n", pcap_geterr(pcap));
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printf("Enter the port to scan: ");
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ret = scanf("%d", &port);
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if (ret != 1)
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printf("scanf port failed\n");
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SNPRINTF(filter, sizeof(filter), "tcp and port %d", port);
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ret = pcap_compile(pcap, &fp, filter, 0, 0);
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if (ret != 0) printf("pcap_compile failed %s\n", pcap_geterr(pcap));
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ret = pcap_setfilter(pcap, &fp);
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if (ret != 0) printf("pcap_setfilter failed %s\n", pcap_geterr(pcap));
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ret = ssl_SetPrivateKey(server, port, "../../certs/server-key.pem",
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FILETYPE_PEM, NULL, err);
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}
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else if (argc >= 3) {
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saveFile = 1;
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pcap = pcap_open_offline(argv[1], err);
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if (pcap == NULL) {
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printf("pcap_open_offline failed %s\n", err);
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ret = -1;
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}
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else {
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const char* passwd = NULL;
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/* defaults for server and port */
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port = 443;
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server = "127.0.0.1";
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if (argc >= 4)
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server = argv[3];
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if (argc >= 5)
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port = atoi(argv[4]);
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if (argc >= 6)
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passwd = argv[5];
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ret = ssl_SetPrivateKey(server, port, argv[2],
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FILETYPE_PEM, passwd, err);
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}
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}
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else {
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/* usage error */
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printf( "usage: ./snifftest or ./snifftest dump pemKey"
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" [server] [port] [password]\n");
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exit(EXIT_FAILURE);
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}
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if (ret != 0)
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err_sys(err);
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if (pcap_datalink(pcap) == DLT_NULL)
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frame = NULL_IF_FRAME_LEN;
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while (1) {
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struct pcap_pkthdr header;
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const unsigned char* packet = pcap_next(pcap, &header);
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if (packet) {
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byte data[65535];
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if (header.caplen > 40) { /* min ip(20) + min tcp(20) */
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packet += frame;
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header.caplen -= frame;
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}
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else
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continue;
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ret = ssl_DecodePacket(packet, header.caplen, data, err);
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if (ret < 0)
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printf("ssl_Decode ret = %d, %s\n", ret, err);
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if (ret > 0) {
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data[ret] = 0;
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printf("SSL App Data:%s\n", data);
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}
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}
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else if (saveFile)
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break; /* we're done reading file */
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}
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return EXIT_SUCCESS;
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}
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#endif /* full build */
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