/*
* dtls_srtp_driver.c
*
* test driver for DTLS-SRTP functions
*
* David McGrew
* Cisco Systems, Inc.
*/
/*
*
* Copyright (c) 2001-2006 Cisco Systems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* Neither the name of the Cisco Systems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <stdio.h> /* for printf() */
#include "getopt_s.h" /* for local getopt() */
#include "srtp_priv.h"
err_status_t
test_dtls_srtp();
srtp_hdr_t *
srtp_create_test_packet(int pkt_octet_len, uint32_t ssrc);
void
usage(char *prog_name) {
printf("usage: %s [ -t ][ -c ][ -v ][-d <debug_module> ]* [ -l ]\n"
" -d <mod> turn on debugging module <mod>\n"
" -l list debugging modules\n", prog_name);
exit(1);
}
int
main(int argc, char *argv[]) {
unsigned do_list_mods = 0;
char q;
err_status_t err;
printf("dtls_srtp_driver\n");
/* initialize srtp library */
err = srtp_init();
if (err) {
printf("error: srtp init failed with error code %d\n", err);
exit(1);
}
/* process input arguments */
while (1) {
q = getopt_s(argc, argv, "ld:");
if (q == -1)
break;
switch (q) {
case 'l':
do_list_mods = 1;
break;
case 'd':
err = crypto_kernel_set_debug_module(optarg_s, 1);
if (err) {
printf("error: set debug module (%s) failed\n", optarg_s);
exit(1);
}
break;
default:
usage(argv[0]);
}
}
if (do_list_mods) {
err = crypto_kernel_list_debug_modules();
if (err) {
printf("error: list of debug modules failed\n");
exit(1);
}
}
printf("testing dtls_srtp...");
err = test_dtls_srtp();
if (err) {
printf("\nerror (code %d)\n", err);
exit(1);
}
printf("passed\n");
return 0;
}
err_status_t
test_dtls_srtp() {
srtp_hdr_t *test_packet;
int test_packet_len = 80;
srtp_t s;
srtp_policy_t policy;
uint8_t key[SRTP_MAX_KEY_LEN];
uint8_t salt[SRTP_MAX_KEY_LEN];
unsigned int key_len, salt_len;
srtp_profile_t profile;
err_status_t err;
/* create a 'null' SRTP session */
err = srtp_create(&s, NULL);
if (err)
return err;
/*
* verify that packet-processing functions behave properly - we
* expect that these functions will return err_status_no_ctx
*/
test_packet = srtp_create_test_packet(80, 0xa5a5a5a5);
if (test_packet == NULL)
return err_status_alloc_fail;
err = srtp_protect(s, test_packet, &test_packet_len);
if (err != err_status_no_ctx) {
printf("wrong return value from srtp_protect() (got code %d)\n",
err);
return err_status_fail;
}
err = srtp_unprotect(s, test_packet, &test_packet_len);
if (err != err_status_no_ctx) {
printf("wrong return value from srtp_unprotect() (got code %d)\n",
err);
return err_status_fail;
}
err = srtp_protect_rtcp(s, test_packet, &test_packet_len);
if (err != err_status_no_ctx) {
printf("wrong return value from srtp_protect_rtcp() (got code %d)\n",
err);
return err_status_fail;
}
err = srtp_unprotect_rtcp(s, test_packet, &test_packet_len);
if (err != err_status_no_ctx) {
printf("wrong return value from srtp_unprotect_rtcp() (got code %d)\n",
err);
return err_status_fail;
}
/*
* set keys to known values for testing
*/
profile = srtp_profile_aes128_cm_sha1_80;
key_len = srtp_profile_get_master_key_length(profile);
salt_len = srtp_profile_get_master_salt_length(profile);
memset(key, 0xff, key_len);
memset(salt, 0xee, salt_len);
append_salt_to_key(key, key_len, salt, salt_len);
policy.key = key;
/* initialize SRTP policy from profile */
err = crypto_policy_set_from_profile_for_rtp(&policy.rtp, profile);
if (err) return err;
err = crypto_policy_set_from_profile_for_rtcp(&policy.rtcp, profile);
if (err) return err;
policy.ssrc.type = ssrc_any_inbound;
policy.ekt = NULL;
policy.window_size = 128;
policy.allow_repeat_tx = 0;
policy.next = NULL;
err = srtp_add_stream(s, &policy);
if (err)
return err;
return err_status_ok;
}
/*
* srtp_create_test_packet(len, ssrc) returns a pointer to a
* (malloced) example RTP packet whose data field has the length given
* by pkt_octet_len and the SSRC value ssrc. The total length of the
* packet is twelve octets longer, since the header is at the
* beginning. There is room at the end of the packet for a trailer,
* and the four octets following the packet are filled with 0xff
* values to enable testing for overwrites.
*
* note that the location of the test packet can (and should) be
* deallocated with the free() call once it is no longer needed.
*/
srtp_hdr_t *
srtp_create_test_packet(int pkt_octet_len, uint32_t ssrc) {
int i;
uint8_t *buffer;
srtp_hdr_t *hdr;
int bytes_in_hdr = 12;
/* allocate memory for test packet */
hdr = malloc(pkt_octet_len + bytes_in_hdr
+ SRTP_MAX_TRAILER_LEN + 4);
if (!hdr)
return NULL;
hdr->version = 2; /* RTP version two */
hdr->p = 0; /* no padding needed */
hdr->x = 0; /* no header extension */
hdr->cc = 0; /* no CSRCs */
hdr->m = 0; /* marker bit */
hdr->pt = 0xf; /* payload type */
hdr->seq = htons(0x1234); /* sequence number */
hdr->ts = htonl(0xdecafbad); /* timestamp */
hdr->ssrc = htonl(ssrc); /* synch. source */
buffer = (uint8_t *)hdr;
buffer += bytes_in_hdr;
/* set RTP data to 0xab */
for (i=0; i < pkt_octet_len; i++)
*buffer++ = 0xab;
/* set post-data value to 0xffff to enable overrun checking */
for (i=0; i < SRTP_MAX_TRAILER_LEN+4; i++)
*buffer++ = 0xff;
return hdr;
}