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237.25.1
(compared to revision 237.7.150)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2015-06-28 16:35:27 UTC
- mto: (237.7.307 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150628163527-cky0ec59zew7teua
Add a plugin helper directory, available to all plugins.
* Makefile (PLUGIN_HELPERS): New; list of plugin helpers.
(CPROGS): Appended "$(PLUGIN_HELPERS)".
* initramfs-tools-hook: Create new plugin helper directory, and copy
plugin helpers provided by the system and/or
by the local administrator.
(PLUGINHELPERDIR): New.
* plugin-runner.c: Take new --plugin-helper-dir option and provide
environment variable to all plugins.
(PHDIR): New; set to "/lib/mandos/plugin-helpers".
(main/pluginhelperdir): New.
(main/options): New option "--plugin-helper-dir".
(main/parse_opt, main/parse_opt_config_file): Accept new option.
(main): Use new option to set MANDOSPLUGINHELPERDIR environment
variable as if using --global-env MANDOSPLUGINHELPERDIR=...
* plugin-runner.xml: Document new --plugin-helper-dir option.
(SYNOPSIS, OPTIONS): Add "--plugin-helper-dir" option.
(PLUGINS/WRITING PLUGINS): Document new environment variable
available to plugins.
(ENVIRONMENT): Document new environment variable
"MANDOSPLUGINHELPERDIR" affected by the new
--plugin-helper-dir option.
* Makefile (PLUGIN_HELPERS): New; list of plugin helpers.
(CPROGS): Appended "$(PLUGIN_HELPERS)".
* initramfs-tools-hook: Create new plugin helper directory, and copy
plugin helpers provided by the system and/or
by the local administrator.
(PLUGINHELPERDIR): New.
* plugin-runner.c: Take new --plugin-helper-dir option and provide
environment variable to all plugins.
(PHDIR): New; set to "/lib/mandos/plugin-helpers".
(main/pluginhelperdir): New.
(main/options): New option "--plugin-helper-dir".
(main/parse_opt, main/parse_opt_config_file): Accept new option.
(main): Use new option to set MANDOSPLUGINHELPERDIR environment
variable as if using --global-env MANDOSPLUGINHELPERDIR=...
* plugin-runner.xml: Document new --plugin-helper-dir option.
(SYNOPSIS, OPTIONS): Add "--plugin-helper-dir" option.
(PLUGINS/WRITING PLUGINS): Document new environment variable
available to plugins.
(ENVIRONMENT): Document new environment variable
"MANDOSPLUGINHELPERDIR" affected by the new
--plugin-helper-dir option.
- files added:
- debian/upstream
- plugin-helpers
- files modified:
- DBUS-API
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
43
stdout, ferror() */
44
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
55
55
opendir(), DIR */
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
60
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
62
*/
62
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
72
73
*/
73
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
75
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
77
79
#include <iso646.h> /* not, or, and */
78
80
#include <argp.h> /* struct argp_option, error_t, struct
79
81
argp_state, struct argp,
91
93
argz_delete(), argz_append(),
92
94
argz_stringify(), argz_add(),
93
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
94
98
95
99
#ifdef __linux__
96
100
#include <sys/klog.h> /* klogctl() */
138
142
static const char sys_class_net[] = "/sys/class/net";
139
143
char *connect_to = NULL;
140
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
141
146
uid_t uid = 65534;
142
147
gid_t gid = 65534;
143
148
161
166
const char *priority;
162
167
gpgme_ctx_t ctx;
163
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
164
171
} mandos_context;
165
172
166
173
/* global so signal handler can reach it*/
178
185
perror(print_text);
179
186
}
180
187
181
__attribute__((format (gnu_printf, 2, 3)))
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
182
189
int fprintf_plus(FILE *stream, const char *format, ...){
183
190
va_list ap;
184
191
va_start (ap, format);
185
192
186
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
187
194
program_invocation_short_name));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
196
}
190
197
191
198
/*
193
200
* bytes. "buffer_capacity" is how much is currently allocated,
194
201
* "buffer_length" is how much is already used.
195
202
*/
203
__attribute__((nonnull, warn_unused_result))
196
204
size_t incbuffer(char **buffer, size_t buffer_length,
197
205
size_t buffer_capacity){
198
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
200
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
201
213
return 0;
202
214
}
215
*buffer = new_buf;
203
216
buffer_capacity += BUFFER_SIZE;
204
217
}
205
218
return buffer_capacity;
206
219
}
207
220
208
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
209
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
210
224
int af, server **current_server){
211
225
int ret;
220
234
.af = af };
221
235
if(new_server->ip == NULL){
222
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
223
252
return false;
224
253
}
225
254
/* Special case of first server */
227
256
new_server->next = new_server;
228
257
new_server->prev = new_server;
229
258
*current_server = new_server;
230
/* Place the new server last in the list */
231
259
} else {
260
/* Place the new server last in the list */
232
261
new_server->next = *current_server;
233
262
new_server->prev = (*current_server)->prev;
234
263
new_server->prev->next = new_server;
235
264
(*current_server)->prev = new_server;
236
265
}
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
238
if(ret == -1){
239
perror_plus("clock_gettime");
240
return false;
241
}
242
266
return true;
243
267
}
244
268
245
269
/*
246
270
* Initialize GPGME.
247
271
*/
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
250
277
gpgme_error_t rc;
251
278
gpgme_engine_info_t engine_info;
252
279
253
280
/*
254
281
* Helper function to insert pub and seckey to the engine keyring.
255
282
*/
256
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
257
284
int ret;
258
285
int fd;
259
286
gpgme_data_t pgp_data;
340
367
* Decrypt OpenPGP data.
341
368
* Returns -1 on error
342
369
*/
370
__attribute__((nonnull, warn_unused_result))
343
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
372
size_t crypto_size,
345
373
char **plaintext,
465
493
return plaintext_length;
466
494
}
467
495
468
static const char * safer_gnutls_strerror(int value){
496
__attribute__((warn_unused_result))
497
static const char *safer_gnutls_strerror(int value){
469
498
const char *ret = gnutls_strerror(value);
470
499
if(ret == NULL)
471
500
ret = "(unknown)";
473
502
}
474
503
475
504
/* GnuTLS log function callback */
505
__attribute__((nonnull))
476
506
static void debuggnutls(__attribute__((unused)) int level,
477
507
const char* string){
478
508
fprintf_plus(stderr, "GnuTLS: %s", string);
479
509
}
480
510
511
__attribute__((nonnull, warn_unused_result))
481
512
static int init_gnutls_global(const char *pubkeyfilename,
482
513
const char *seckeyfilename,
483
514
mandos_context *mc){
557
588
return -1;
558
589
}
559
590
591
__attribute__((nonnull, warn_unused_result))
560
592
static int init_gnutls_session(gnutls_session_t *session,
561
593
mandos_context *mc){
562
594
int ret;
619
651
__attribute__((unused)) const char *txt){}
620
652
621
653
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
622
655
static int start_mandos_communication(const char *ip, in_port_t port,
623
656
AvahiIfIndex if_index,
624
657
int af, mandos_context *mc){
625
658
int ret, tcp_sd = -1;
626
659
ssize_t sret;
627
union {
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
630
} to;
660
struct sockaddr_storage to;
631
661
char *buffer = NULL;
632
662
char *decrypted_buffer = NULL;
633
663
size_t buffer_length = 0;
657
687
return -1;
658
688
}
659
689
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
693
bool match = false;
694
{
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
697
interface))){
698
if(if_nametoindex(interface) == (unsigned int)if_index){
699
match = true;
700
break;
701
}
702
}
703
}
704
if(not match){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
707
if(debug){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf_plus(stderr, "Skipping server on non-used interface"
713
" \"%s\"\n",
714
if_indextoname((unsigned int)if_index,
715
interface));
716
}
717
}
718
return -1;
719
}
720
}
721
660
722
ret = init_gnutls_session(&session, mc);
661
723
if(ret != 0){
662
724
return -1;
682
744
683
745
memset(&to, 0, sizeof(to));
684
746
if(af == AF_INET6){
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
687
749
} else { /* IPv4 */
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
690
752
}
691
753
if(ret < 0 ){
692
754
int e = errno;
701
763
goto mandos_end;
702
764
}
703
765
if(af == AF_INET6){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
707
-Wunreachable-code*/
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
708
769
if(if_index == AVAHI_IF_UNSPEC){
709
770
fprintf_plus(stderr, "An IPv6 link-local address is"
710
771
" incomplete without a network interface\n");
712
773
goto mandos_end;
713
774
}
714
775
/* Set the network interface number as scope */
715
to.in6.sin6_scope_id = (uint32_t)if_index;
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
716
777
}
717
778
} else {
718
to.in.sin_port = htons(port); /* Spurious warnings from
719
-Wconversion and
720
-Wunreachable-code */
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
721
780
}
722
781
723
782
if(quit_now){
740
799
}
741
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
742
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
const char *pcret;
744
802
if(af == AF_INET6){
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
sizeof(addrstr));
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
806
NI_NUMERICHOST);
747
807
} else {
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
sizeof(addrstr));
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
811
NI_NUMERICHOST);
750
812
}
751
if(pcret == NULL){
752
perror_plus("inet_ntop");
753
} else {
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
756
}
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
757
819
}
758
820
}
759
821
763
825
}
764
826
765
827
if(af == AF_INET6){
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
767
830
} else {
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
769
833
}
770
834
if(ret < 0){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
772
836
int e = errno;
773
837
perror_plus("connect");
774
838
errno = e;
989
1053
return retval;
990
1054
}
991
1055
1056
__attribute__((nonnull))
992
1057
static void resolve_callback(AvahiSServiceResolver *r,
993
1058
AvahiIfIndex interface,
994
1059
AvahiProtocol proto,
1002
1067
AVAHI_GCC_UNUSED AvahiStringList *txt,
1003
1068
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1004
1069
flags,
1005
void* mc){
1070
void *mc){
1006
1071
if(r == NULL){
1007
1072
return;
1008
1073
}
1011
1076
timed out */
1012
1077
1013
1078
if(quit_now){
1079
avahi_s_service_resolver_free(r);
1014
1080
return;
1015
1081
}
1016
1082
1061
1127
const char *domain,
1062
1128
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1063
1129
flags,
1064
void* mc){
1130
void *mc){
1065
1131
if(b == NULL){
1066
1132
return;
1067
1133
}
1127
1193
errno = old_errno;
1128
1194
}
1129
1195
1196
__attribute__((nonnull, warn_unused_result))
1130
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1131
1198
int ret;
1132
1199
error_t ret_errno;
1151
1218
return true;
1152
1219
}
1153
1220
1221
__attribute__((nonnull, warn_unused_result))
1154
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1155
1223
1156
1224
/* Reject the loopback device */
1198
1266
* corresponds to an acceptable network device.
1199
1267
* (This function is passed to scandir(3) as a filter function.)
1200
1268
*/
1269
__attribute__((nonnull, warn_unused_result))
1201
1270
int good_interface(const struct dirent *if_entry){
1202
1271
if(if_entry->d_name[0] == '.'){
1203
1272
return 0;
1221
1290
/*
1222
1291
* This function determines if a network interface is up.
1223
1292
*/
1293
__attribute__((nonnull, warn_unused_result))
1224
1294
bool interface_is_up(const char *interface){
1225
1295
struct ifreq ifr;
1226
1296
if(not get_flags(interface, &ifr)){
1237
1307
/*
1238
1308
* This function determines if a network interface is running
1239
1309
*/
1310
__attribute__((nonnull, warn_unused_result))
1240
1311
bool interface_is_running(const char *interface){
1241
1312
struct ifreq ifr;
1242
1313
if(not get_flags(interface, &ifr)){
1250
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1251
1322
}
1252
1323
1324
__attribute__((nonnull, pure, warn_unused_result))
1253
1325
int notdotentries(const struct dirent *direntry){
1254
1326
/* Skip "." and ".." */
1255
1327
if(direntry->d_name[0] == '.'
1262
1334
}
1263
1335
1264
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1265
1338
int runnable_hook(const struct dirent *direntry){
1266
1339
int ret;
1267
1340
size_t sret;
1275
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1276
1349
"abcdefghijklmnopqrstuvwxyz"
1277
1350
"0123456789"
1278
"_-");
1351
"_.-");
1279
1352
if((direntry->d_name)[sret] != '\0'){
1280
1353
/* Contains non-allowed characters */
1281
1354
if(debug){
1285
1358
return 0;
1286
1359
}
1287
1360
1288
char *fullname = NULL;
1289
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1290
if(ret < 0){
1291
perror_plus("asprintf");
1292
return 0;
1293
}
1294
1295
ret = stat(fullname, &st);
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1296
1362
if(ret == -1){
1297
1363
if(debug){
1298
1364
perror_plus("Could not stat hook");
1322
1388
return 1;
1323
1389
}
1324
1390
1391
__attribute__((nonnull, warn_unused_result))
1325
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1326
1393
mandos_context *mc){
1327
1394
int ret;
1331
1398
1332
1399
while(true){
1333
1400
if(mc->current_server == NULL){
1334
if (debug){
1401
if(debug){
1335
1402
fprintf_plus(stderr, "Wait until first server is found."
1336
1403
" No timeout!\n");
1337
1404
}
1338
1405
ret = avahi_simple_poll_iterate(s, -1);
1339
1406
} else {
1340
if (debug){
1407
if(debug){
1341
1408
fprintf_plus(stderr, "Check current_server if we should run"
1342
1409
" it, or wait\n");
1343
1410
}
1360
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1361
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1362
1429
1363
if (debug){
1430
if(debug){
1364
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1365
1432
block_time);
1366
1433
}
1388
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1389
1456
}
1390
1457
if(ret != 0){
1391
if (ret > 0 or errno != EINTR){
1458
if(ret > 0 or errno != EINTR){
1392
1459
return (ret != 1) ? ret : 0;
1393
1460
}
1394
1461
}
1396
1463
}
1397
1464
1398
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1399
1467
error_t raise_privileges(void){
1400
1468
error_t old_errno = errno;
1401
1469
error_t ret_errno = 0;
1402
1470
if(seteuid(0) == -1){
1403
1471
ret_errno = errno;
1404
perror_plus("seteuid");
1405
1472
}
1406
1473
errno = old_errno;
1407
1474
return ret_errno;
1408
1475
}
1409
1476
1410
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1411
1479
error_t raise_privileges_permanently(void){
1412
1480
error_t old_errno = errno;
1413
1481
error_t ret_errno = raise_privileges();
1417
1485
}
1418
1486
if(setuid(0) == -1){
1419
1487
ret_errno = errno;
1420
perror_plus("seteuid");
1421
1488
}
1422
1489
errno = old_errno;
1423
1490
return ret_errno;
1424
1491
}
1425
1492
1426
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1427
1495
error_t lower_privileges(void){
1428
1496
error_t old_errno = errno;
1429
1497
error_t ret_errno = 0;
1430
1498
if(seteuid(uid) == -1){
1431
1499
ret_errno = errno;
1432
perror_plus("seteuid");
1433
1500
}
1434
1501
errno = old_errno;
1435
1502
return ret_errno;
1436
1503
}
1437
1504
1438
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1439
1507
error_t lower_privileges_permanently(void){
1440
1508
error_t old_errno = errno;
1441
1509
error_t ret_errno = 0;
1442
1510
if(setuid(uid) == -1){
1443
1511
ret_errno = errno;
1444
perror_plus("setuid");
1445
1512
}
1446
1513
errno = old_errno;
1447
1514
return ret_errno;
1448
1515
}
1449
1516
1450
bool run_network_hooks(const char *mode, const char *interface,
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1451
1519
const float delay){
1452
struct dirent **direntries;
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1525
if(debug){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1528
}
1529
} else {
1530
perror_plus("open");
1531
}
1532
return;
1533
}
1534
}
1535
#ifdef __GLIBC__
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
alphasort);
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
alphasort);
1546
#endif /* not __GLIBC__ */
1547
if(numhooks == -1){
1548
perror_plus("scandir");
1549
return;
1550
}
1453
1551
struct dirent *direntry;
1454
1552
int ret;
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1456
alphasort);
1457
if(numhooks == -1){
1458
if(errno == ENOENT){
1459
if(debug){
1460
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1461
" found\n", hookdir);
1462
}
1463
} else {
1464
perror_plus("scandir");
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1556
if(debug){
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1558
direntry->d_name);
1465
1559
}
1466
} else {
1467
int devnull = open("/dev/null", O_RDONLY);
1468
for(int i = 0; i < numhooks; i++){
1469
direntry = direntries[i];
1470
char *fullname = NULL;
1471
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1472
if(ret < 0){
1560
pid_t hook_pid = fork();
1561
if(hook_pid == 0){
1562
/* Child */
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1565
if(errno != 0){
1566
perror_plus("Failed to raise privileges");
1567
_exit(EX_NOPERM);
1568
}
1569
/* Set group */
1570
errno = 0;
1571
ret = setgid(0);
1572
if(ret == -1){
1573
perror_plus("setgid");
1574
_exit(EX_NOPERM);
1575
}
1576
/* Reset supplementary groups */
1577
errno = 0;
1578
ret = setgroups(0, NULL);
1579
if(ret == -1){
1580
perror_plus("setgroups");
1581
_exit(EX_NOPERM);
1582
}
1583
ret = dup2(devnull, STDIN_FILENO);
1584
if(ret == -1){
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1586
_exit(EX_OSERR);
1587
}
1588
ret = close(devnull);
1589
if(ret == -1){
1590
perror_plus("close");
1591
_exit(EX_OSERR);
1592
}
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
if(ret == -1){
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1596
_exit(EX_OSERR);
1597
}
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
if(ret == -1){
1600
perror_plus("setenv");
1601
_exit(EX_OSERR);
1602
}
1603
ret = setenv("DEVICE", interface, 1);
1604
if(ret == -1){
1605
perror_plus("setenv");
1606
_exit(EX_OSERR);
1607
}
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
if(ret == -1){
1610
perror_plus("setenv");
1611
_exit(EX_OSERR);
1612
}
1613
ret = setenv("MODE", mode, 1);
1614
if(ret == -1){
1615
perror_plus("setenv");
1616
_exit(EX_OSERR);
1617
}
1618
char *delaystring;
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1620
if(ret == -1){
1473
1621
perror_plus("asprintf");
1474
continue;
1475
}
1476
if(debug){
1477
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1478
direntry->d_name);
1479
}
1480
pid_t hook_pid = fork();
1481
if(hook_pid == 0){
1482
/* Child */
1483
/* Raise privileges */
1484
raise_privileges_permanently();
1485
/* Set group */
1486
errno = 0;
1487
ret = setgid(0);
1488
if(ret == -1){
1489
perror_plus("setgid");
1490
}
1491
/* Reset supplementary groups */
1492
errno = 0;
1493
ret = setgroups(0, NULL);
1494
if(ret == -1){
1495
perror_plus("setgroups");
1496
}
1497
dup2(devnull, STDIN_FILENO);
1498
close(devnull);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1501
if(ret == -1){
1502
perror_plus("setenv");
1503
_exit(EX_OSERR);
1504
}
1505
ret = setenv("DEVICE", interface, 1);
1506
if(ret == -1){
1507
perror_plus("setenv");
1508
_exit(EX_OSERR);
1509
}
1510
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1511
if(ret == -1){
1512
perror_plus("setenv");
1513
_exit(EX_OSERR);
1514
}
1515
ret = setenv("MODE", mode, 1);
1516
if(ret == -1){
1517
perror_plus("setenv");
1518
_exit(EX_OSERR);
1519
}
1520
char *delaystring;
1521
ret = asprintf(&delaystring, "%f", delay);
1522
if(ret == -1){
1523
perror_plus("asprintf");
1524
_exit(EX_OSERR);
1525
}
1526
ret = setenv("DELAY", delaystring, 1);
1527
if(ret == -1){
1528
free(delaystring);
1529
perror_plus("setenv");
1530
_exit(EX_OSERR);
1531
}
1622
_exit(EX_OSERR);
1623
}
1624
ret = setenv("DELAY", delaystring, 1);
1625
if(ret == -1){
1532
1626
free(delaystring);
1533
if(connect_to != NULL){
1534
ret = setenv("CONNECT", connect_to, 1);
1535
if(ret == -1){
1536
perror_plus("setenv");
1537
_exit(EX_OSERR);
1538
}
1539
}
1540
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1541
perror_plus("execl");
1542
_exit(EXIT_FAILURE);
1543
}
1627
perror_plus("setenv");
1628
_exit(EX_OSERR);
1629
}
1630
free(delaystring);
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1633
if(ret == -1){
1634
perror_plus("setenv");
1635
_exit(EX_OSERR);
1636
}
1637
}
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
if(hook_fd == -1){
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1642
}
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1646
}
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
environ) == -1){
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1651
}
1652
} else {
1653
if(hook_pid == -1){
1654
perror_plus("fork");
1655
free(direntry);
1656
continue;
1657
}
1658
int status;
1659
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
perror_plus("waitpid");
1661
free(direntry);
1662
continue;
1663
}
1664
if(WIFEXITED(status)){
1665
if(WEXITSTATUS(status) != 0){
1666
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1667
" with status %d\n", direntry->d_name,
1668
WEXITSTATUS(status));
1669
free(direntry);
1670
continue;
1671
}
1672
} else if(WIFSIGNALED(status)){
1673
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1674
" signal %d\n", direntry->d_name,
1675
WTERMSIG(status));
1676
free(direntry);
1677
continue;
1544
1678
} else {
1545
int status;
1546
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1547
perror_plus("waitpid");
1548
free(fullname);
1549
continue;
1550
}
1551
if(WIFEXITED(status)){
1552
if(WEXITSTATUS(status) != 0){
1553
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1554
" with status %d\n", direntry->d_name,
1555
WEXITSTATUS(status));
1556
free(fullname);
1557
continue;
1558
}
1559
} else if(WIFSIGNALED(status)){
1560
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1561
" signal %d\n", direntry->d_name,
1562
WTERMSIG(status));
1563
free(fullname);
1564
continue;
1565
} else {
1566
fprintf_plus(stderr, "Warning: network hook \"%s\""
1567
" crashed\n", direntry->d_name);
1568
free(fullname);
1569
continue;
1570
}
1571
}
1572
free(fullname);
1573
if(debug){
1574
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1575
direntry->d_name);
1576
}
1577
}
1578
close(devnull);
1579
}
1580
return true;
1679
fprintf_plus(stderr, "Warning: network hook \"%s\""
1680
" crashed\n", direntry->d_name);
1681
free(direntry);
1682
continue;
1683
}
1684
}
1685
if(debug){
1686
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
direntry->d_name);
1688
}
1689
free(direntry);
1690
}
1691
free(direntries);
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1693
perror_plus("close");
1694
} else {
1695
hookdir_fd = -1;
1696
}
1697
close(devnull);
1581
1698
}
1582
1699
1700
__attribute__((nonnull, warn_unused_result))
1583
1701
error_t bring_up_interface(const char *const interface,
1584
1702
const float delay){
1585
int sd = -1;
1586
1703
error_t old_errno = errno;
1587
error_t ret_errno = 0;
1588
int ret, ret_setflags;
1704
int ret;
1589
1705
struct ifreq network;
1590
1706
unsigned int if_index = if_nametoindex(interface);
1591
1707
if(if_index == 0){
1600
1716
}
1601
1717
1602
1718
if(not interface_is_up(interface)){
1603
if(not get_flags(interface, &network) and debug){
1719
error_t ret_errno = 0, ioctl_errno = 0;
1720
if(not get_flags(interface, &network)){
1604
1721
ret_errno = errno;
1605
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1606
1723
"\"%s\"\n", interface);
1724
errno = old_errno;
1607
1725
return ret_errno;
1608
1726
}
1609
network.ifr_flags |= IFF_UP;
1727
network.ifr_flags |= IFF_UP; /* set flag */
1610
1728
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1612
if(sd < 0){
1729
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1730
if(sd == -1){
1613
1731
ret_errno = errno;
1614
1732
perror_plus("socket");
1615
1733
errno = old_errno;
1616
1734
return ret_errno;
1617
1735
}
1618
1736
1619
1737
if(quit_now){
1620
close(sd);
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1621
1742
errno = old_errno;
1622
1743
return EINTR;
1623
1744
}
1627
1748
interface);
1628
1749
}
1629
1750
1630
/* Raise priviliges */
1631
raise_privileges();
1751
/* Raise privileges */
1752
ret_errno = raise_privileges();
1753
if(ret_errno != 0){
1754
errno = ret_errno;
1755
perror_plus("Failed to raise privileges");
1756
}
1632
1757
1633
1758
#ifdef __linux__
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1759
int ret_linux;
1760
bool restore_loglevel = false;
1761
if(ret_errno == 0){
1762
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1763
messages about the network interface to mess up the prompt */
1764
ret_linux = klogctl(8, NULL, 5);
1765
if(ret_linux == -1){
1766
perror_plus("klogctl");
1767
} else {
1768
restore_loglevel = true;
1769
}
1641
1770
}
1642
1771
#endif /* __linux__ */
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1644
ret_errno = errno;
1772
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1773
ioctl_errno = errno;
1645
1774
#ifdef __linux__
1646
1775
if(restore_loglevel){
1647
1776
ret_linux = klogctl(7, NULL, 0);
1651
1780
}
1652
1781
#endif /* __linux__ */
1653
1782
1654
/* Lower privileges */
1655
lower_privileges();
1783
/* If raise_privileges() succeeded above */
1784
if(ret_errno == 0){
1785
/* Lower privileges */
1786
ret_errno = lower_privileges();
1787
if(ret_errno != 0){
1788
errno = ret_errno;
1789
perror_plus("Failed to lower privileges");
1790
}
1791
}
1656
1792
1657
1793
/* Close the socket */
1658
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1661
1797
}
1662
1798
1663
1799
if(ret_setflags == -1){
1664
errno = ret_errno;
1800
errno = ioctl_errno;
1665
1801
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1666
1802
errno = old_errno;
1667
return ret_errno;
1803
return ioctl_errno;
1668
1804
}
1669
1805
} else if(debug){
1670
1806
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1688
1824
return 0;
1689
1825
}
1690
1826
1827
__attribute__((nonnull, warn_unused_result))
1691
1828
error_t take_down_interface(const char *const interface){
1692
int sd = -1;
1693
1829
error_t old_errno = errno;
1694
error_t ret_errno = 0;
1695
int ret, ret_setflags;
1696
1830
struct ifreq network;
1697
1831
unsigned int if_index = if_nametoindex(interface);
1698
1832
if(if_index == 0){
1701
1835
return ENXIO;
1702
1836
}
1703
1837
if(interface_is_up(interface)){
1838
error_t ret_errno = 0, ioctl_errno = 0;
1704
1839
if(not get_flags(interface, &network) and debug){
1705
1840
ret_errno = errno;
1706
1841
fprintf_plus(stderr, "Failed to get flags for interface "
1707
1842
"\"%s\"\n", interface);
1843
errno = old_errno;
1708
1844
return ret_errno;
1709
1845
}
1710
1846
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1711
1847
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
if(sd < 0){
1848
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd == -1){
1714
1850
ret_errno = errno;
1715
1851
perror_plus("socket");
1716
1852
errno = old_errno;
1722
1858
interface);
1723
1859
}
1724
1860
1725
/* Raise priviliges */
1726
raise_privileges();
1727
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1729
ret_errno = errno;
1730
1731
/* Lower privileges */
1732
lower_privileges();
1861
/* Raise privileges */
1862
ret_errno = raise_privileges();
1863
if(ret_errno != 0){
1864
errno = ret_errno;
1865
perror_plus("Failed to raise privileges");
1866
}
1867
1868
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1869
ioctl_errno = errno;
1870
1871
/* If raise_privileges() succeeded above */
1872
if(ret_errno == 0){
1873
/* Lower privileges */
1874
ret_errno = lower_privileges();
1875
if(ret_errno != 0){
1876
errno = ret_errno;
1877
perror_plus("Failed to lower privileges");
1878
}
1879
}
1733
1880
1734
1881
/* Close the socket */
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1736
1883
if(ret == -1){
1737
1884
perror_plus("close");
1738
1885
}
1739
1886
1740
1887
if(ret_setflags == -1){
1741
errno = ret_errno;
1888
errno = ioctl_errno;
1742
1889
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1743
1890
errno = old_errno;
1744
return ret_errno;
1891
return ioctl_errno;
1745
1892
}
1746
1893
} else if(debug){
1747
1894
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1755
1902
int main(int argc, char *argv[]){
1756
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1757
1904
.priority = "SECURE256:!CTYPE-X.509:"
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1905
"+CTYPE-OPENPGP", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
1759
1907
AvahiSServiceBrowser *sb = NULL;
1760
1908
error_t ret_errno;
1761
1909
int ret;
1762
1910
intmax_t tmpmax;
1763
1911
char *tmp;
1764
1912
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1767
1913
char *interfaces_to_take_down = NULL;
1768
1914
size_t interfaces_to_take_down_size = 0;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
1915
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1916
char old_tempdir[] = "/tmp/mandosXXXXXX";
1917
char *tempdir = NULL;
1771
1918
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1772
1919
const char *seckey = PATHDIR "/" SECKEY;
1773
1920
const char *pubkey = PATHDIR "/" PUBKEY;
1774
1921
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1776
1922
1777
1923
bool gnutls_initialized = false;
1778
1924
bool gpgme_initialized = false;
1869
2015
connect_to = arg;
1870
2016
break;
1871
2017
case 'i': /* --interface */
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1873
(int)',');
2018
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2019
arg, (int)',');
1874
2020
if(ret_errno != 0){
1875
2021
argp_error(state, "%s", strerror(ret_errno));
1876
2022
}
1956
2102
/* Work around Debian bug #633582:
1957
2103
<http://bugs.debian.org/633582> */
1958
2104
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
2105
/* Re-raise privileges */
2106
ret_errno = raise_privileges();
2107
if(ret_errno != 0){
2108
errno = ret_errno;
2109
perror_plus("Failed to raise privileges");
2110
} else {
1961
2111
struct stat st;
1962
2112
1963
2113
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2003
2153
}
2004
2154
2005
2155
/* Lower privileges */
2006
errno = 0;
2007
ret = seteuid(uid);
2008
if(ret == -1){
2009
perror_plus("seteuid");
2156
ret_errno = lower_privileges();
2157
if(ret_errno != 0){
2158
errno = ret_errno;
2159
perror_plus("Failed to lower privileges");
2010
2160
}
2011
2161
}
2012
2162
}
2013
2163
2014
/* Remove empty interface names */
2164
/* Remove invalid interface names (except "none") */
2015
2165
{
2016
2166
char *interface = NULL;
2017
while((interface = argz_next(interfaces, interfaces_size,
2167
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2018
2168
interface))){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2169
if(strcmp(interface, "none") != 0
2170
and if_nametoindex(interface) == 0){
2171
if(interface[0] != '\0'){
2021
2172
fprintf_plus(stderr, "Not using nonexisting interface"
2022
2173
" \"%s\"\n", interface);
2023
2174
}
2024
argz_delete(&interfaces, &interfaces_size, interface);
2175
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2025
2176
interface = NULL;
2026
2177
}
2027
2178
}
2029
2180
2030
2181
/* Run network hooks */
2031
2182
{
2032
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2183
if(mc.interfaces != NULL){
2184
interfaces_hooks = malloc(mc.interfaces_size);
2035
2185
if(interfaces_hooks == NULL){
2036
2186
perror_plus("malloc");
2037
2187
goto end;
2038
2188
}
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2042
(int)',');
2043
}
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2046
goto end;
2047
}
2189
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2190
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2191
}
2192
run_network_hooks("start", interfaces_hooks != NULL ?
2193
interfaces_hooks : "", delay);
2048
2194
}
2049
2195
2050
2196
if(not debug){
2127
2273
}
2128
2274
2129
2275
/* If no interfaces were specified, make a list */
2130
if(interfaces == NULL){
2131
struct dirent **direntries;
2276
if(mc.interfaces == NULL){
2277
struct dirent **direntries = NULL;
2132
2278
/* Look for any good interfaces */
2133
2279
ret = scandir(sys_class_net, &direntries, good_interface,
2134
2280
alphasort);
2135
2281
if(ret >= 1){
2136
2282
/* Add all found interfaces to interfaces list */
2137
2283
for(int i = 0; i < ret; ++i){
2138
ret_errno = argz_add(&interfaces, &interfaces_size,
2284
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2139
2285
direntries[i]->d_name);
2140
2286
if(ret_errno != 0){
2287
errno = ret_errno;
2141
2288
perror_plus("argz_add");
2289
free(direntries[i]);
2142
2290
continue;
2143
2291
}
2144
2292
if(debug){
2145
2293
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2146
2294
direntries[i]->d_name);
2147
2295
}
2296
free(direntries[i]);
2148
2297
}
2149
2298
free(direntries);
2150
2299
} else {
2151
free(direntries);
2300
if(ret == 0){
2301
free(direntries);
2302
}
2152
2303
fprintf_plus(stderr, "Could not find a network interface\n");
2153
2304
exitcode = EXIT_FAILURE;
2154
2305
goto end;
2155
2306
}
2156
2307
}
2157
2308
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2160
if(debug){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2162
interfaces);
2163
}
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2165
}
2166
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2309
/* Bring up interfaces which are down, and remove any "none"s */
2310
{
2170
2311
char *interface = NULL;
2171
while((interface = argz_next(interfaces, interfaces_size,
2312
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2172
2313
interface))){
2314
/* If interface name is "none", stop bringing up interfaces.
2315
Also remove all instances of "none" from the list */
2316
if(strcmp(interface, "none") == 0){
2317
argz_delete(&mc.interfaces, &mc.interfaces_size,
2318
interface);
2319
interface = NULL;
2320
while((interface = argz_next(mc.interfaces,
2321
mc.interfaces_size, interface))){
2322
if(strcmp(interface, "none") == 0){
2323
argz_delete(&mc.interfaces, &mc.interfaces_size,
2324
interface);
2325
interface = NULL;
2326
}
2327
}
2328
break;
2329
}
2173
2330
bool interface_was_up = interface_is_up(interface);
2174
ret = bring_up_interface(interface, delay);
2331
errno = bring_up_interface(interface, delay);
2175
2332
if(not interface_was_up){
2176
if(ret != 0){
2177
errno = ret;
2333
if(errno != 0){
2178
2334
perror_plus("Failed to bring up interface");
2179
2335
} else {
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2182
interface);
2336
errno = argz_add(&interfaces_to_take_down,
2337
&interfaces_to_take_down_size,
2338
interface);
2339
if(errno != 0){
2340
perror_plus("argz_add");
2341
}
2183
2342
}
2184
2343
}
2185
2344
}
2186
free(interfaces);
2187
interfaces = NULL;
2188
interfaces_size = 0;
2189
2345
if(debug and (interfaces_to_take_down == NULL)){
2190
2346
fprintf_plus(stderr, "No interfaces were brought up\n");
2191
2347
}
2192
2348
}
2193
2349
2350
/* If we only got one interface, explicitly use only that one */
2351
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2352
if(debug){
2353
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2354
mc.interfaces);
2355
}
2356
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2357
}
2358
2194
2359
if(quit_now){
2195
2360
goto end;
2196
2361
}
2208
2373
goto end;
2209
2374
}
2210
2375
2211
if(mkdtemp(tempdir) == NULL){
2376
/* Try /run/tmp before /tmp */
2377
tempdir = mkdtemp(run_tempdir);
2378
if(tempdir == NULL and errno == ENOENT){
2379
if(debug){
2380
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2381
run_tempdir, old_tempdir);
2382
}
2383
tempdir = mkdtemp(old_tempdir);
2384
}
2385
if(tempdir == NULL){
2212
2386
perror_plus("mkdtemp");
2213
2387
goto end;
2214
2388
}
2215
tempdir_created = true;
2216
2389
2217
2390
if(quit_now){
2218
2391
goto end;
2254
2427
exitcode = EX_USAGE;
2255
2428
goto end;
2256
2429
}
2257
2430
2258
2431
if(quit_now){
2259
2432
goto end;
2260
2433
}
2290
2463
fprintf_plus(stderr, "Retrying in %d seconds\n",
2291
2464
(int)retry_interval);
2292
2465
}
2293
sleep((int)retry_interval);
2466
sleep((unsigned int)retry_interval);
2294
2467
}
2295
2468
2296
if (not quit_now){
2469
if(not quit_now){
2297
2470
exitcode = EXIT_SUCCESS;
2298
2471
}
2299
2472
2354
2527
if(debug){
2355
2528
fprintf_plus(stderr, "Starting Avahi loop search\n");
2356
2529
}
2357
2530
2358
2531
ret = avahi_loop_with_timeout(simple_poll,
2359
2532
(int)(retry_interval * 1000), &mc);
2360
2533
if(debug){
2369
2542
}
2370
2543
2371
2544
/* Cleanup things */
2545
free(mc.interfaces);
2546
2372
2547
if(sb != NULL)
2373
2548
avahi_s_service_browser_free(sb);
2374
2549
2394
2569
mc.current_server->prev->next = NULL;
2395
2570
while(mc.current_server != NULL){
2396
2571
server *next = mc.current_server->next;
2572
#ifdef __GNUC__
2573
#pragma GCC diagnostic push
2574
#pragma GCC diagnostic ignored "-Wcast-qual"
2575
#endif
2576
free((char *)(mc.current_server->ip));
2577
#ifdef __GNUC__
2578
#pragma GCC diagnostic pop
2579
#endif
2397
2580
free(mc.current_server);
2398
2581
mc.current_server = next;
2399
2582
}
2400
2583
}
2401
2584
2402
/* Re-raise priviliges */
2585
/* Re-raise privileges */
2403
2586
{
2404
raise_privileges();
2405
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2409
2410
/* Take down the network interfaces which were brought up */
2411
{
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2415
interface))){
2416
ret_errno = take_down_interface(interface);
2417
if(ret_errno != 0){
2418
errno = ret_errno;
2419
perror_plus("Failed to take down interface");
2420
}
2421
}
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2424
" down\n");
2425
}
2426
}
2427
2428
lower_privileges_permanently();
2587
ret_errno = raise_privileges();
2588
if(ret_errno != 0){
2589
errno = ret_errno;
2590
perror_plus("Failed to raise privileges");
2591
} else {
2592
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2596
2597
/* Take down the network interfaces which were brought up */
2598
{
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2602
interface))){
2603
ret_errno = take_down_interface(interface);
2604
if(ret_errno != 0){
2605
errno = ret_errno;
2606
perror_plus("Failed to take down interface");
2607
}
2608
}
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
" down\n");
2612
}
2613
}
2614
}
2615
2616
ret_errno = lower_privileges_permanently();
2617
if(ret_errno != 0){
2618
errno = ret_errno;
2619
perror_plus("Failed to lower privileges permanently");
2620
}
2429
2621
}
2430
2622
2431
2623
free(interfaces_to_take_down);
2432
2624
free(interfaces_hooks);
2433
2625
2434
2626
/* Removes the GPGME temp directory and all files inside */
2435
if(tempdir_created){
2627
if(tempdir != NULL){
2436
2628
struct dirent **direntries = NULL;
2437
struct dirent *direntry = NULL;
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2439
alphasort);
2440
if (numentries > 0){
2441
for(int i = 0; i < numentries; i++){
2442
direntry = direntries[i];
2443
char *fullname = NULL;
2444
ret = asprintf(&fullname, "%s/%s", tempdir,
2445
direntry->d_name);
2446
if(ret < 0){
2447
perror_plus("asprintf");
2448
continue;
2449
}
2450
ret = remove(fullname);
2451
if(ret == -1){
2452
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2453
strerror(errno));
2454
}
2455
free(fullname);
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2630
O_NOFOLLOW));
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2633
} else {
2634
#ifdef __GLIBC__
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
alphasort);
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2644
alphasort);
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2649
if(ret == -1){
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2653
}
2654
free(direntries[i]);
2655
}
2656
2657
/* need to clean even if 0 because man page doesn't specify */
2658
free(direntries);
2659
if(numentries == -1){
2660
perror_plus("scandir");
2661
}
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
2665
}
2456
2666
}
2457
}
2458
2459
/* need to clean even if 0 because man page doesn't specify */
2460
free(direntries);
2461
if (numentries == -1){
2462
perror_plus("scandir");
2463
}
2464
ret = rmdir(tempdir);
2465
if(ret == -1 and errno != ENOENT){
2466
perror_plus("rmdir");
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
2467
2668
}
2468
2669
}
2469
2670
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0