26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
#define _FORTIFY_SOURCE 2
34
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
37
35
#define _FILE_OFFSET_BITS 64
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
93
/* All Avahi types, constants and functions
41
#include <net/if.h> /* if_nametoindex */
96
43
#include <avahi-core/core.h>
97
44
#include <avahi-core/lookup.h>
98
45
#include <avahi-core/log.h>
100
47
#include <avahi-common/malloc.h>
101
48
#include <avahi-common/error.h>
104
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
107
init_gnutls_session(),
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
111
GNUTLS_OPENPGP_FMT_BASE64 */
114
#include <gpgme.h> /* All GPGME types, constants and
117
GPGME_PROTOCOL_OpenPGP,
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
65
#include <errno.h> /* perror() */
72
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
74
#define CERTFILE CERT_ROOT "openpgp-client.txt"
75
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
120
76
#define BUFFER_SIZE 256
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
126
79
bool debug = false;
127
static const char mandos_protocol_version[] = "1";
128
const char *argp_program_version = "mandos-client " VERSION;
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
/* Used for passing in values through the Avahi callback functions */
133
AvahiSimplePoll *simple_poll;
82
gnutls_session_t session;
135
83
gnutls_certificate_credentials_t cred;
136
unsigned int dh_bits;
137
84
gnutls_dh_params_t dh_params;
138
const char *priority;
88
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
89
char **new_packet, const char *homedir){
90
gpgme_data_t dh_crypto, dh_plain;
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
153
* "buffer_length" is how much is already used.
155
size_t incbuffer(char **buffer, size_t buffer_length,
156
size_t buffer_capacity){
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
162
buffer_capacity += BUFFER_SIZE;
164
return buffer_capacity;
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
173
96
gpgme_engine_info_t engine_info;
177
* Helper function to insert pub and seckey to the engine keyring.
179
bool import_key(const char *filename){
182
gpgme_data_t pgp_data;
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
197
rc = gpgme_op_import(mc.ctx, pgp_data);
198
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
208
gpgme_data_release(pgp_data);
213
fprintf(stderr, "Initializing GPGME\n");
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
217
103
gpgme_check_version(NULL);
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
219
if(rc != GPG_ERR_NO_ERROR){
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
221
gpgme_strsource(rc), gpgme_strerror(rc));
104
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
225
/* Set GPGME home directory for the OpenPGP engine only */
226
rc = gpgme_get_engine_info(&engine_info);
227
if(rc != GPG_ERR_NO_ERROR){
106
/* Set GPGME home directory */
107
rc = gpgme_get_engine_info (&engine_info);
108
if (rc != GPG_ERR_NO_ERROR){
228
109
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
229
110
gpgme_strsource(rc), gpgme_strerror(rc));
232
113
while(engine_info != NULL){
233
114
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
234
115
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
235
engine_info->file_name, tempdir);
116
engine_info->file_name, homedir);
238
119
engine_info = engine_info->next;
240
121
if(engine_info == NULL){
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
245
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
247
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
253
if(not import_key(pubkey) or not import_key(seckey)){
261
* Decrypt OpenPGP data.
262
* Returns -1 on error
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
gpgme_data_t dh_crypto, dh_plain;
270
size_t plaintext_capacity = 0;
271
ssize_t plaintext_length = 0;
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
277
/* Create new GPGME data buffer from memory cryptotext */
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
280
if(rc != GPG_ERR_NO_ERROR){
122
fprintf(stderr, "Could not set home dir to %s\n", homedir);
126
/* Create new GPGME data buffer from packet buffer */
127
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
128
if (rc != GPG_ERR_NO_ERROR){
281
129
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
282
130
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
192
/* Delete the GPGME FILE pointer cryptotext data buffer */
193
gpgme_data_release(dh_crypto);
335
195
/* Seek back to the beginning of the GPGME plaintext data buffer */
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
338
plaintext_length = -1;
196
gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET);
344
plaintext_capacity = incbuffer(plaintext,
345
(size_t)plaintext_length,
347
if(plaintext_capacity == 0){
349
plaintext_length = -1;
200
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
201
*new_packet = realloc(*new_packet,
202
(unsigned int)new_packet_capacity
204
if (*new_packet == NULL){
208
new_packet_capacity += BUFFER_SIZE;
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
211
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
355
213
/* Print the data, if any */
361
218
perror("gpgme_data_read");
362
plaintext_length = -1;
365
plaintext_length += ret;
369
fprintf(stderr, "Decrypted password is: ");
370
for(ssize_t i = 0; i < plaintext_length; i++){
371
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
373
fprintf(stderr, "\n");
378
/* Delete the GPGME cryptotext data buffer */
379
gpgme_data_release(dh_crypto);
221
new_packet_length += ret;
224
/* FIXME: check characters before printing to screen so to not print
225
terminal control characters */
227
/* fprintf(stderr, "decrypted password is: "); */
228
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
229
/* fprintf(stderr, "\n"); */
381
232
/* Delete the GPGME plaintext data buffer */
382
233
gpgme_data_release(dh_plain);
383
return plaintext_length;
234
return new_packet_length;
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
237
static const char * safer_gnutls_strerror (int value) {
238
const char *ret = gnutls_strerror (value);
390
240
ret = "(unknown)";
394
/* GnuTLS log function callback */
395
static void debuggnutls(__attribute__((unused)) int level,
397
fprintf(stderr, "GnuTLS: %s", string);
244
void debuggnutls(__attribute__((unused)) int level,
246
fprintf(stderr, "%s", string);
400
static int init_gnutls_global(const char *pubkeyfilename,
401
const char *seckeyfilename){
249
int initgnutls(encrypted_session *es){
405
254
fprintf(stderr, "Initializing GnuTLS\n");
408
ret = gnutls_global_init();
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
257
if ((ret = gnutls_global_init ())
258
!= GNUTLS_E_SUCCESS) {
259
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
416
/* "Use a log level over 10 to enable all debugging options."
419
264
gnutls_global_set_log_level(11);
420
265
gnutls_global_set_log_function(debuggnutls);
423
/* OpenPGP credentials */
424
gnutls_certificate_allocate_credentials(&mc.cred);
425
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
430
safer_gnutls_strerror(ret));
431
gnutls_global_deinit();
268
/* openpgp credentials */
269
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
270
!= GNUTLS_E_SUCCESS) {
271
fprintf (stderr, "memory error: %s\n",
272
safer_gnutls_strerror(ret));
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
277
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
278
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
441
282
ret = gnutls_certificate_set_openpgp_key_file
442
(mc.cred, pubkeyfilename, seckeyfilename,
443
GNUTLS_OPENPGP_FMT_BASE64);
444
if(ret != GNUTLS_E_SUCCESS){
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
449
safer_gnutls_strerror(ret));
453
/* GnuTLS server initialization */
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
473
gnutls_certificate_free_credentials(mc.cred);
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
479
static int init_gnutls_session(gnutls_session_t *session){
481
/* GnuTLS session creation */
483
ret = gnutls_init(session, GNUTLS_SERVER);
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
if(ret != GNUTLS_E_SUCCESS){
283
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
284
if (ret != GNUTLS_E_SUCCESS) {
286
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
288
ret, CERTFILE, KEYFILE);
289
fprintf(stdout, "The Error is: %s\n",
290
safer_gnutls_strerror(ret));
294
//GnuTLS server initialization
295
if ((ret = gnutls_dh_params_init (&es->dh_params))
296
!= GNUTLS_E_SUCCESS) {
297
fprintf (stderr, "Error in dh parameter initialization: %s\n",
298
safer_gnutls_strerror(ret));
302
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in prime generation: %s\n",
305
safer_gnutls_strerror(ret));
309
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
311
// GnuTLS session creation
312
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
313
!= GNUTLS_E_SUCCESS){
489
314
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
490
315
safer_gnutls_strerror(ret));
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
498
gnutls_deinit(*session);
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
if(ret != GNUTLS_E_SUCCESS){
503
fprintf(stderr, "Syntax error at: %s\n", err);
504
fprintf(stderr, "GnuTLS error: %s\n",
505
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
318
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf(stderr, "Syntax error at: %s\n", err);
321
fprintf(stderr, "GnuTLS error: %s\n",
322
safer_gnutls_strerror(ret));
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
gnutls_deinit(*session);
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
326
if ((ret = gnutls_credentials_set
327
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Error setting a credentials set: %s\n",
521
330
safer_gnutls_strerror(ret));
522
gnutls_deinit(*session);
526
334
/* ignore client certificate if any. */
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
335
gnutls_certificate_server_set_request (es->session,
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
338
gnutls_dh_set_prime_bits (es->session, DH_BITS);
534
/* Avahi log function callback */
535
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
536
__attribute__((unused)) const char *txt){}
343
void empty_log(__attribute__((unused)) AvahiLogLevel level,
344
__attribute__((unused)) const char *txt){}
538
/* Called when a Mandos server is found */
539
static int start_mandos_communication(const char *ip, uint16_t port,
540
AvahiIfIndex if_index,
542
int ret, tcp_sd = -1;
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
346
int start_mandos_communication(const char *ip, uint16_t port,
347
unsigned int if_index){
349
struct sockaddr_in6 to;
350
encrypted_session es;
548
351
char *buffer = NULL;
549
char *decrypted_buffer = NULL;
352
char *decrypted_buffer;
550
353
size_t buffer_length = 0;
551
354
size_t buffer_capacity = 0;
554
gnutls_session_t session;
555
int pf; /* Protocol family */
572
fprintf(stderr, "Bad address family: %d\n", af);
577
ret = init_gnutls_session(&session);
355
ssize_t decrypted_buffer_size;
358
char interface[IF_NAMESIZE];
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
361
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
364
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
590
366
perror("socket");
600
memset(&to, 0, sizeof(to));
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
370
if(if_indextoname(if_index, interface) == NULL){
372
perror("if_indextoname");
378
fprintf(stderr, "Binding to interface %s\n", interface);
381
memset(&to,0,sizeof(to)); /* Spurious warning */
382
to.sin6_family = AF_INET6;
383
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
610
385
perror("inet_pton");
616
389
fprintf(stderr, "Bad address: %s\n", ip);
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
623
-Wunreachable-code */
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
628
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
634
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
638
to.in.sin_port = htons(port); /* Spurious warnings from
640
-Wunreachable-code */
392
to.sin6_port = htons(port); /* Spurious warning */
394
to.sin6_scope_id = (uint32_t)if_index;
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
char interface[IF_NAMESIZE];
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
674
if(strcmp(addrstr, ip) != 0){
675
fprintf(stderr, "Canonical address form: %s\n", addrstr);
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
397
fprintf(stderr, "Connection to: %s\n", ip);
400
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
692
402
perror("connect");
702
const char *out = mandos_protocol_version;
705
size_t out_size = strlen(out);
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
707
out_size - written));
714
written += (size_t)ret;
715
if(written < out_size){
718
if(out == mandos_protocol_version){
406
ret = initgnutls (&es);
412
gnutls_transport_set_ptr (es.session,
413
(gnutls_transport_ptr_t) tcp_sd);
733
416
fprintf(stderr, "Establishing TLS session with %s\n", ip);
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
749
ret = gnutls_handshake(session);
754
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
756
if(ret != GNUTLS_E_SUCCESS){
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
765
/* Read OpenPGP packet that contains the wanted password */
419
ret = gnutls_handshake (es.session);
421
if (ret != GNUTLS_E_SUCCESS){
422
fprintf(stderr, "\n*** Handshake failed ***\n");
428
//Retrieve OpenPGP packet that contains the wanted password
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
431
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
779
buffer_capacity = incbuffer(&buffer, buffer_length,
781
if(buffer_capacity == 0){
793
sret = gnutls_record_recv(session, buffer+buffer_length,
436
if (buffer_length + BUFFER_SIZE > buffer_capacity){
437
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
442
buffer_capacity += BUFFER_SIZE;
445
ret = gnutls_record_recv
446
(es.session, buffer+buffer_length, BUFFER_SIZE);
800
452
case GNUTLS_E_INTERRUPTED:
801
453
case GNUTLS_E_AGAIN:
803
455
case GNUTLS_E_REHANDSHAKE:
805
ret = gnutls_handshake(session);
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
456
ret = gnutls_handshake (es.session);
458
fprintf(stderr, "\n*** Handshake failed ***\n");
820
465
fprintf(stderr, "Unknown error while reading data from"
821
" encrypted session with Mandos server\n");
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
466
" encrypted session with mandos server\n");
468
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
827
buffer_length += (size_t) sret;
832
fprintf(stderr, "Closing TLS session\n");
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
848
if(buffer_length > 0){
849
ssize_t decrypted_buffer_size;
472
buffer_length += (size_t) ret;
476
if (buffer_length > 0){
850
477
decrypted_buffer_size = pgp_packet_decrypt(buffer,
853
if(decrypted_buffer_size >= 0){
856
while(written < (size_t) decrypted_buffer_size){
862
ret = (int)fwrite(decrypted_buffer + written, 1,
863
(size_t)decrypted_buffer_size - written,
481
if (decrypted_buffer_size >= 0){
482
while(written < decrypted_buffer_size){
483
ret = (int)fwrite (decrypted_buffer + written, 1,
484
(size_t)decrypted_buffer_size - written,
865
486
if(ret == 0 and ferror(stdout)){
868
488
fprintf(stderr, "Error writing encrypted data: %s\n",
869
489
strerror(errno));
874
494
written += (size_t)ret;
880
/* Shutdown procedure */
885
free(decrypted_buffer);
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
896
gnutls_deinit(session);
496
free(decrypted_buffer);
505
fprintf(stderr, "Closing TLS session\n");
509
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
512
gnutls_deinit (es.session);
513
gnutls_certificate_free_credentials (es.cred);
514
gnutls_global_deinit ();
906
static void resolve_callback(AvahiSServiceResolver *r,
907
AvahiIfIndex interface,
909
AvahiResolverEvent event,
913
const char *host_name,
914
const AvahiAddress *address,
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
919
AVAHI_GCC_UNUSED void* userdata){
518
static AvahiSimplePoll *simple_poll = NULL;
519
static AvahiServer *server = NULL;
521
static void resolve_callback(
522
AvahiSServiceResolver *r,
523
AvahiIfIndex interface,
524
AVAHI_GCC_UNUSED AvahiProtocol protocol,
525
AvahiResolverEvent event,
529
const char *host_name,
530
const AvahiAddress *address,
532
AVAHI_GCC_UNUSED AvahiStringList *txt,
533
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
534
AVAHI_GCC_UNUSED void* userdata) {
536
assert(r); /* Spurious warning */
922
538
/* Called whenever a service has been resolved successfully or
931
543
case AVAHI_RESOLVER_FAILURE:
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
934
avahi_strerror(avahi_server_errno(mc.server)));
544
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
545
" type '%s' in domain '%s': %s\n", name, type, domain,
546
avahi_strerror(avahi_server_errno(server)));
937
549
case AVAHI_RESOLVER_FOUND:
939
551
char ip[AVAHI_ADDRESS_STR_MAX];
940
552
avahi_address_snprint(ip, sizeof(ip), address);
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
554
fprintf(stderr, "Mandos server found on %s (%s) on port %d\n",
555
host_name, ip, port);
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
949
avahi_simple_poll_quit(mc.simple_poll);
557
int ret = start_mandos_communication(ip, port,
558
(unsigned int) interface);
953
566
avahi_s_service_resolver_free(r);
956
static void browse_callback(AvahiSServiceBrowser *b,
957
AvahiIfIndex interface,
958
AvahiProtocol protocol,
959
AvahiBrowserEvent event,
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
965
AVAHI_GCC_UNUSED void* userdata){
968
/* Called whenever a new services becomes available on the LAN or
969
is removed from the LAN */
977
case AVAHI_BROWSER_FAILURE:
979
fprintf(stderr, "(Avahi browser) %s\n",
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
984
case AVAHI_BROWSER_NEW:
985
/* We ignore the returned Avahi resolver object. In the callback
986
function we free it. If the Avahi server is terminated before
987
the callback function is called the Avahi server will free the
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
994
name, avahi_strerror(avahi_server_errno(mc.server)));
997
case AVAHI_BROWSER_REMOVE:
1000
case AVAHI_BROWSER_ALL_FOR_NOW:
1001
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1003
fprintf(stderr, "No Mandos server found, still searching...\n");
1009
/* stop main loop after sigterm has been called */
1010
static void handle_sigterm(int sig){
1015
signal_received = sig;
1016
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1023
int main(int argc, char *argv[]){
1024
AvahiSServiceBrowser *sb = NULL;
1029
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1033
bool take_down_interface = false;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
bool tempdir_created = false;
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
const char *seckey = PATHDIR "/" SECKEY;
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1043
bool gnutls_initialized = false;
1044
bool gpgme_initialized = false;
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1053
/* Lower any group privileges we might have, just to be safe */
1060
/* Lower user privileges (temporarily) */
1072
struct argp_option options[] = {
1073
{ .name = "debug", .key = 128,
1074
.doc = "Debug mode", .group = 3 },
1075
{ .name = "connect", .key = 'c',
1076
.arg = "ADDRESS:PORT",
1077
.doc = "Connect directly to a specific Mandos server",
1079
{ .name = "interface", .key = 'i',
1081
.doc = "Network interface that will be used to search for"
1084
{ .name = "seckey", .key = 's',
1086
.doc = "OpenPGP secret key file base name",
1088
{ .name = "pubkey", .key = 'p',
1090
.doc = "OpenPGP public key file base name",
1092
{ .name = "dh-bits", .key = 129,
1094
.doc = "Bit length of the prime number used in the"
1095
" Diffie-Hellman key exchange",
1097
{ .name = "priority", .key = 130,
1099
.doc = "GnuTLS priority string for the TLS handshake",
1101
{ .name = "delay", .key = 131,
1103
.doc = "Maximum delay to wait for interface startup",
1106
* These reproduce what we would get without ARGP_NO_HELP
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
1117
error_t parse_opt(int key, char *arg,
1118
struct argp_state *state){
1121
case 128: /* --debug */
1124
case 'c': /* --connect */
1127
case 'i': /* --interface */
1130
case 's': /* --seckey */
1133
case 'p': /* --pubkey */
1136
case 129: /* --dh-bits */
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
argp_error(state, "Bad number of DH bits");
1143
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1145
case 130: /* --priority */
1148
case 131: /* --delay */
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad delay");
1156
* These reproduce what we would get without ARGP_NO_HELP
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
1170
return ARGP_ERR_UNKNOWN;
1175
struct argp argp = { .options = options, .parser = parse_opt,
1177
.doc = "Mandos client -- Get and decrypt"
1178
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
569
static void browse_callback(
570
AvahiSServiceBrowser *b,
571
AvahiIfIndex interface,
572
AvahiProtocol protocol,
573
AvahiBrowserEvent event,
577
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
580
AvahiServer *s = userdata;
581
assert(b); /* Spurious warning */
583
/* Called whenever a new services becomes available on the LAN or
584
is removed from the LAN */
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1191
exitcode = EX_USAGE;
1197
avahi_set_log_function(empty_log);
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
from the signal handler */
1202
/* Initialize the pseudo-RNG for Avahi */
1203
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1207
exitcode = EX_UNAVAILABLE;
1211
sigemptyset(&sigterm_action.sa_mask);
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1214
perror("sigaddset");
1215
exitcode = EX_OSERR;
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1220
perror("sigaddset");
1221
exitcode = EX_OSERR;
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1226
perror("sigaddset");
1227
exitcode = EX_OSERR;
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1236
perror("sigaction");
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1249
perror("sigaction");
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1262
perror("sigaction");
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1279
exitcode = EX_UNAVAILABLE;
1287
/* Re-raise priviliges */
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1300
restore_loglevel = false;
1303
#endif /* __linux__ */
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1308
exitcode = EX_OSERR;
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1328
perror("ioctl SIOCGIFFLAGS");
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1403
if(take_down_interface){
1404
/* Lower privileges */
1410
/* Lower privileges permanently */
1422
ret = init_gnutls_global(pubkey, seckey);
1424
fprintf(stderr, "init_gnutls_global failed\n");
1425
exitcode = EX_UNAVAILABLE;
1428
gnutls_initialized = true;
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
1448
exitcode = EX_UNAVAILABLE;
1451
gpgme_initialized = true;
1458
if(connect_to != NULL){
1459
/* Connect directly, do not use Zeroconf */
1460
/* (Mainly meant for debugging) */
1461
char *address = strrchr(connect_to, ':');
1462
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
1464
exitcode = EX_USAGE;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
1478
exitcode = EX_USAGE;
1486
port = (uint16_t)tmpmax;
1488
address = connect_to;
1489
/* Colon in address indicates IPv6 */
1491
if(strchr(address, ':') != NULL){
1501
ret = start_mandos_communication(address, port, if_index, af);
1507
exitcode = EX_NOHOST;
1510
exitcode = EX_USAGE;
1513
exitcode = EX_IOERR;
1516
exitcode = EX_PROTOCOL;
1519
exitcode = EX_OSERR;
1523
exitcode = EXIT_SUCCESS;
588
case AVAHI_BROWSER_FAILURE:
590
fprintf(stderr, "(Browser) %s\n",
591
avahi_strerror(avahi_server_errno(server)));
592
avahi_simple_poll_quit(simple_poll);
595
case AVAHI_BROWSER_NEW:
596
/* We ignore the returned resolver object. In the callback
597
function we free it. If the server is terminated before
598
the callback function is called the server will free
599
the resolver for us. */
601
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
603
AVAHI_PROTO_INET6, 0,
604
resolve_callback, s)))
605
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
606
avahi_strerror(avahi_server_errno(s)));
609
case AVAHI_BROWSER_REMOVE:
612
case AVAHI_BROWSER_ALL_FOR_NOW:
613
case AVAHI_BROWSER_CACHE_EXHAUSTED:
618
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
1533
619
AvahiServerConfig config;
1534
/* Do not publish any local Zeroconf records */
620
AvahiSServiceBrowser *sb = NULL;
623
int returncode = EXIT_SUCCESS;
624
const char *interface = "eth0";
627
static struct option long_options[] = {
628
{"debug", no_argument, (int *)&debug, 1},
629
{"interface", required_argument, 0, 'i'},
632
int option_index = 0;
633
ret = getopt_long (argc, argv, "i:", long_options,
652
avahi_set_log_function(empty_log);
655
/* Initialize the psuedo-RNG */
656
srand((unsigned int) time(NULL));
658
/* Allocate main loop object */
659
if (!(simple_poll = avahi_simple_poll_new())) {
660
fprintf(stderr, "Failed to create simple poll object.\n");
665
/* Do not publish any local records */
1535
666
avahi_server_config_init(&config);
1536
667
config.publish_hinfo = 0;
1537
668
config.publish_addresses = 0;
1538
669
config.publish_workstation = 0;
1539
670
config.publish_domain = 0;
1541
672
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1546
/* Free the Avahi configuration data */
673
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
674
&config, NULL, NULL, &error);
676
/* Free the configuration data */
1547
677
avahi_server_config_free(&config);
1550
/* Check if creating the Avahi server object succeeded */
1551
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
1554
exitcode = EX_UNAVAILABLE;
1562
/* Create the Avahi service browser */
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
1569
exitcode = EX_UNAVAILABLE;
1577
/* Run the main loop */
1580
fprintf(stderr, "Starting Avahi loop search\n");
1583
avahi_simple_poll_loop(mc.simple_poll);
1588
fprintf(stderr, "%s exiting\n", argv[0]);
1591
/* Cleanup things */
1593
avahi_s_service_browser_free(sb);
1595
if(mc.server != NULL)
1596
avahi_server_free(mc.server);
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
1601
if(gnutls_initialized){
1602
gnutls_certificate_free_credentials(mc.cred);
1603
gnutls_global_deinit();
1604
gnutls_dh_params_deinit(mc.dh_params);
1607
if(gpgme_initialized){
1608
gpgme_release(mc.ctx);
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
perror("ioctl SIOCSIFFLAGS");
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1634
/* Lower privileges permanently */
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1649
if(errno != ENOENT){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1672
ret = remove(fullname);
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1694
perror("sigaction");
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1703
TEMP_FAILURE_RETRY(pause());
679
/* Check if creating the server object succeeded */
681
fprintf(stderr, "Failed to create server: %s\n",
682
avahi_strerror(error));
683
returncode = EXIT_FAILURE;
687
/* Create the service browser */
688
sb = avahi_s_service_browser_new(server,
690
if_nametoindex(interface),
692
"_mandos._tcp", NULL, 0,
693
browse_callback, server);
695
fprintf(stderr, "Failed to create service browser: %s\n",
696
avahi_strerror(avahi_server_errno(server)));
697
returncode = EXIT_FAILURE;
701
/* Run the main loop */
704
fprintf(stderr, "Starting avahi loop search\n");
707
avahi_simple_poll_loop(simple_poll);
712
fprintf(stderr, "%s exiting\n", argv[0]);
717
avahi_s_service_browser_free(sb);
720
avahi_server_free(server);
723
avahi_simple_poll_free(simple_poll);