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This file is part of avahi.
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avahi is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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avahi is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with avahi; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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/* -*- coding: utf-8 -*- */
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* Mandos client - get and decrypt data from a Mandos server
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* This program is partly derived from an example program for an Avahi
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* service browser, downloaded from
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* <http://avahi.org/browser/examples/core-browse-services.c>. This
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* includes the following functions: "resolve_callback",
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* "browse_callback", and parts of "main".
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* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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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, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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/* Needed by GPGME, specifically gpgme_data_seek() */
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#define _LARGEFILE_SOURCE
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#define _FILE_OFFSET_BITS 64
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void debuggnutls(int level, const char* string){
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static void debuggnutls(__attribute__((unused)) int level,
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fprintf(stderr, "%s", string);
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int initgnutls(encrypted_session *es){
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static int initgnutls(mandos_context *mc, gnutls_session_t *session,
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gnutls_dh_params_t *dh_params){
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fprintf(stderr, "Initializing gnutls\n");
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fprintf(stderr, "Initializing GnuTLS\n");
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if ((ret = gnutls_global_init ())
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!= GNUTLS_E_SUCCESS) {
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fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
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gnutls_global_set_log_level(11);
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gnutls_global_set_log_function(debuggnutls);
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/* openpgp credentials */
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if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
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if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
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!= GNUTLS_E_SUCCESS) {
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fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
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fprintf (stderr, "memory error: %s\n",
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safer_gnutls_strerror(ret));
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fprintf(stderr, "Attempting to use openpgp certificate %s"
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" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
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fprintf(stderr, "Attempting to use OpenPGP certificate %s"
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" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
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ret = gnutls_certificate_set_openpgp_key_file
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(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
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(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
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if (ret != GNUTLS_E_SUCCESS) {
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(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
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ret, CERTFILE, KEYFILE);
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(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
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ret, pubkeyfile, seckeyfile);
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fprintf(stdout, "The Error is: %s\n",
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safer_gnutls_strerror(ret));
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//Gnutls server initialization
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if ((ret = gnutls_dh_params_init (&es->dh_params))
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//GnuTLS server initialization
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if ((ret = gnutls_dh_params_init(dh_params))
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!= GNUTLS_E_SUCCESS) {
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fprintf (stderr, "Error in dh parameter initialization: %s\n",
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safer_gnutls_strerror(ret));
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if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
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if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
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!= GNUTLS_E_SUCCESS) {
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fprintf (stderr, "Error in prime generation: %s\n",
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safer_gnutls_strerror(ret));
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gnutls_certificate_set_dh_params (es->cred, es->dh_params);
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// Gnutls session creation
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if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
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gnutls_certificate_set_dh_params(mc->cred, *dh_params);
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// GnuTLS session creation
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if ((ret = gnutls_init(session, GNUTLS_SERVER))
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!= GNUTLS_E_SUCCESS){
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fprintf(stderr, "Error in gnutls session initialization: %s\n",
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fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
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safer_gnutls_strerror(ret));
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if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
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if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
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!= GNUTLS_E_SUCCESS) {
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fprintf(stderr, "Syntax error at: %s\n", err);
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fprintf(stderr, "Gnutls error: %s\n",
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fprintf(stderr, "GnuTLS error: %s\n",
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safer_gnutls_strerror(ret));
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if ((ret = gnutls_credentials_set
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(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
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if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
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!= GNUTLS_E_SUCCESS) {
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fprintf(stderr, "Error setting a credentials set: %s\n",
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safer_gnutls_strerror(ret));
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/* ignore client certificate if any. */
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gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
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gnutls_certificate_server_set_request (*session,
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gnutls_dh_set_prime_bits (es->session, DH_BITS);
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gnutls_dh_set_prime_bits (*session, mc->dh_bits);
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void empty_log(AvahiLogLevel level, const char *txt){}
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static void empty_log(__attribute__((unused)) AvahiLogLevel level,
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__attribute__((unused)) const char *txt){}
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int start_mandos_communcation(char *ip, uint16_t port){
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static int start_mandos_communication(const char *ip, uint16_t port,
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AvahiIfIndex if_index,
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struct sockaddr_in6 to;
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struct in6_addr ip_addr;
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encrypted_session es;
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char *buffer = NULL;
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char *decrypted_buffer;
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size_t buffer_length = 0;
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size_t buffer_capacity = 0;
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ssize_t decrypted_buffer_size;
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const char interface[] = "eth0";
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char interface[IF_NAMESIZE];
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gnutls_session_t session;
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gnutls_dh_params_t dh_params;
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fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
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fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
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tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
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//shutdown procedure
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fprintf(stderr, "Closing tls session\n");
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fprintf(stderr, "Closing TLS session\n");
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gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
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gnutls_bye (session, GNUTLS_SHUT_RDWR);
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gnutls_deinit (es.session);
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gnutls_certificate_free_credentials (es.cred);
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gnutls_deinit (session);
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gnutls_certificate_free_credentials (mc->cred);
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gnutls_global_deinit ();
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static AvahiSimplePoll *simple_poll = NULL;
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static AvahiServer *server = NULL;
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static void resolve_callback(
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AvahiSServiceResolver *r,
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AVAHI_GCC_UNUSED AvahiIfIndex interface,
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AVAHI_GCC_UNUSED AvahiProtocol protocol,
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AvahiResolverEvent event,
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const char *host_name,
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const AvahiAddress *address,
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AvahiStringList *txt,
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AvahiLookupResultFlags flags,
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AVAHI_GCC_UNUSED void* userdata) {
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/* Called whenever a service has been resolved successfully or timed out */
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case AVAHI_RESOLVER_FAILURE:
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fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
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case AVAHI_RESOLVER_FOUND: {
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char ip[AVAHI_ADDRESS_STR_MAX];
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avahi_address_snprint(ip, sizeof(ip), address);
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fprintf(stderr, "Mandos server found at %s on port %d\n", ip, port);
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int ret = start_mandos_communcation(ip, port);
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avahi_s_service_resolver_free(r);
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static void browse_callback(
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AvahiSServiceBrowser *b,
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AvahiIfIndex interface,
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AvahiProtocol protocol,
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AvahiBrowserEvent event,
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AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
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AvahiServer *s = userdata;
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/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
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case AVAHI_BROWSER_FAILURE:
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fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
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avahi_simple_poll_quit(simple_poll);
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case AVAHI_BROWSER_NEW:
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/* We ignore the returned resolver object. In the callback
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function we free it. If the server is terminated before
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the callback function is called the server will free
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the resolver for us. */
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if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
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fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
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case AVAHI_BROWSER_REMOVE:
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case AVAHI_BROWSER_ALL_FOR_NOW:
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case AVAHI_BROWSER_CACHE_EXHAUSTED:
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static void resolve_callback( AvahiSServiceResolver *r,
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AvahiIfIndex interface,
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AVAHI_GCC_UNUSED AvahiProtocol protocol,
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AvahiResolverEvent event,
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const char *host_name,
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const AvahiAddress *address,
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AVAHI_GCC_UNUSED AvahiStringList *txt,
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AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
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mandos_context *mc = userdata;
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assert(r); /* Spurious warning */
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/* Called whenever a service has been resolved successfully or
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case AVAHI_RESOLVER_FAILURE:
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fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
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" type '%s' in domain '%s': %s\n", name, type, domain,
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avahi_strerror(avahi_server_errno(mc->server)));
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case AVAHI_RESOLVER_FOUND:
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char ip[AVAHI_ADDRESS_STR_MAX];
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avahi_address_snprint(ip, sizeof(ip), address);
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fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
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" port %d\n", name, host_name, ip, port);
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int ret = start_mandos_communication(ip, port, interface, mc);
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avahi_s_service_resolver_free(r);
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static void browse_callback( AvahiSServiceBrowser *b,
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AvahiIfIndex interface,
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AvahiProtocol protocol,
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AvahiBrowserEvent event,
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AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
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mandos_context *mc = userdata;
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assert(b); /* Spurious warning */
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/* Called whenever a new services becomes available on the LAN or
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is removed from the LAN */
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case AVAHI_BROWSER_FAILURE:
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fprintf(stderr, "(Browser) %s\n",
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avahi_strerror(avahi_server_errno(mc->server)));
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avahi_simple_poll_quit(mc->simple_poll);
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case AVAHI_BROWSER_NEW:
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/* We ignore the returned resolver object. In the callback
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function we free it. If the server is terminated before
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the callback function is called the server will free
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the resolver for us. */
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if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
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AVAHI_PROTO_INET6, 0,
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resolve_callback, mc)))
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fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
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avahi_strerror(avahi_server_errno(mc->server)));
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case AVAHI_BROWSER_REMOVE:
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case AVAHI_BROWSER_ALL_FOR_NOW:
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case AVAHI_BROWSER_CACHE_EXHAUSTED:
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/* Combines file name and path and returns the malloced new
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string. some sane checks could/should be added */
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static const char *combinepath(const char *first, const char *second){
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size_t f_len = strlen(first);
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size_t s_len = strlen(second);
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char *tmp = malloc(f_len + s_len + 2);
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memcpy(tmp, first, f_len); /* Spurious warning */
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memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
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tmp[f_len + 1 + s_len] = '\0';
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int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
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AvahiServerConfig config;
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AvahiSServiceBrowser *sb = NULL;
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const char db[] = "--debug";
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int returncode = EXIT_SUCCESS;
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char *basename = rindex(argv[0], '/');
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if(basename == NULL){
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char *program_name = malloc(strlen(basename) + sizeof(db));
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if (program_name == NULL){
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program_name[0] = '\0';
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for (int i = 1; i < argc; i++){
577
if (not strncmp(argv[i], db, 5)){
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strcat(strcat(strcat(program_name, db ), "="), basename);
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if(not strcmp(argv[i], db) or not strcmp(argv[i], program_name)){
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const char *interface = "eth0";
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struct ifreq network;
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char *connect_to = NULL;
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AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
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mandos_context mc = { .simple_poll = NULL, .server = NULL,
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.dh_bits = 1024, .priority = "SECURE256"};
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debug_int = debug ? 1 : 0;
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struct option long_options[] = {
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{"debug", no_argument, &debug_int, 1},
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{"connect", required_argument, NULL, 'c'},
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{"interface", required_argument, NULL, 'i'},
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{"keydir", required_argument, NULL, 'd'},
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{"seckey", required_argument, NULL, 's'},
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{"pubkey", required_argument, NULL, 'p'},
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{"dh-bits", required_argument, NULL, 'D'},
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{"priority", required_argument, NULL, 'P'},
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int option_index = 0;
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ret = getopt_long (argc, argv, "i:", long_options,
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mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
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mc.priority = optarg;
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debug = debug_int ? true : false;
721
pubkeyfile = combinepath(keydir, pubkeyfile);
722
if (pubkeyfile == NULL){
723
perror("combinepath");
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returncode = EXIT_FAILURE;
728
seckeyfile = combinepath(keydir, seckeyfile);
729
if (seckeyfile == NULL){
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perror("combinepath");
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if_index = (AvahiIfIndex) if_nametoindex(interface);
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fprintf(stderr, "No such interface: \"%s\"\n", interface);
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if(connect_to != NULL){
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/* Connect directly, do not use Zeroconf */
742
/* (Mainly meant for debugging) */
743
char *address = strrchr(connect_to, ':');
745
fprintf(stderr, "No colon in address\n");
749
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
751
perror("Bad port number");
755
address = connect_to;
756
ret = start_mandos_communication(address, port, if_index, &mc);
764
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
767
returncode = EXIT_FAILURE;
770
strcpy(network.ifr_name, interface); /* Spurious warning */
771
ret = ioctl(sd, SIOCGIFFLAGS, &network);
774
perror("ioctl SIOCGIFFLAGS");
775
returncode = EXIT_FAILURE;
778
if((network.ifr_flags & IFF_UP) == 0){
779
network.ifr_flags |= IFF_UP;
780
ret = ioctl(sd, SIOCSIFFLAGS, &network);
782
perror("ioctl SIOCSIFFLAGS");
783
returncode = EXIT_FAILURE;
587
790
avahi_set_log_function(empty_log);
590
793
/* Initialize the psuedo-RNG */
794
srand((unsigned int) time(NULL));
593
796
/* Allocate main loop object */
594
if (!(simple_poll = avahi_simple_poll_new())) {
797
if (!(mc.simple_poll = avahi_simple_poll_new())) {
595
798
fprintf(stderr, "Failed to create simple poll object.\n");
799
returncode = EXIT_FAILURE;