9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2013 Teddy Hogeborn
13
* Copyright © 2008-2013 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
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
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
64
65
#include <errno.h> /* perror(), errno,
65
66
program_invocation_short_name */
66
67
#include <time.h> /* nanosleep(), time(), sleep() */
161
163
const char *priority;
163
165
server *current_server;
165
size_t interfaces_size;
166
166
} mandos_context;
168
/* global so signal handler can reach it*/
169
AvahiSimplePoll *simple_poll;
168
/* global context so signal handler can reach it*/
169
mandos_context mc = { .simple_poll = NULL, .server = NULL,
170
.dh_bits = 1024, .priority = "SECURE256"
171
":!CTYPE-X.509:+CTYPE-OPENPGP",
172
.current_server = NULL };
171
174
sig_atomic_t quit_now = 0;
172
175
int signal_received = 0;
188
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
189
192
program_invocation_short_name));
190
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
210
213
/* Add server to set of servers to retry periodically */
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
212
int af, server **current_server){
214
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
214
217
server *new_server = malloc(sizeof(server));
215
218
if(new_server == NULL){
227
230
/* Special case of first server */
228
if(*current_server == NULL){
231
if (mc.current_server == NULL){
229
232
new_server->next = new_server;
230
233
new_server->prev = new_server;
231
*current_server = new_server;
234
mc.current_server = new_server;
232
235
/* Place the new server last in the list */
234
new_server->next = *current_server;
235
new_server->prev = (*current_server)->prev;
237
new_server->next = mc.current_server;
238
new_server->prev = mc.current_server->prev;
236
239
new_server->prev->next = new_server;
237
(*current_server)->prev = new_server;
240
mc.current_server->prev = new_server;
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
242
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
241
244
perror_plus("clock_gettime");
248
251
* Initialize GPGME.
250
253
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
254
const char *tempdir){
252
255
gpgme_error_t rc;
253
256
gpgme_engine_info_t engine_info;
256
260
* Helper function to insert pub and seckey to the engine keyring.
276
rc = gpgme_op_import(mc->ctx, pgp_data);
280
rc = gpgme_op_import(mc.ctx, pgp_data);
277
281
if(rc != GPG_ERR_NO_ERROR){
278
282
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
279
283
gpgme_strsource(rc), gpgme_strerror(rc));
325
329
/* Create new GPGME "context" */
326
rc = gpgme_new(&(mc->ctx));
330
rc = gpgme_new(&(mc.ctx));
327
331
if(rc != GPG_ERR_NO_ERROR){
328
332
fprintf_plus(stderr, "Mandos plugin mandos-client: "
329
333
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
378
381
/* Decrypt data from the cryptotext data buffer to the plaintext
380
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
383
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
381
384
if(rc != GPG_ERR_NO_ERROR){
382
385
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
383
386
gpgme_strsource(rc), gpgme_strerror(rc));
384
387
plaintext_length = -1;
386
389
gpgme_decrypt_result_t result;
387
result = gpgme_op_decrypt_result(mc->ctx);
390
result = gpgme_op_decrypt_result(mc.ctx);
388
391
if(result == NULL){
389
392
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
507
510
/* OpenPGP credentials */
508
ret = gnutls_certificate_allocate_credentials(&mc->cred);
511
ret = gnutls_certificate_allocate_credentials(&mc.cred);
509
512
if(ret != GNUTLS_E_SUCCESS){
510
513
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
511
514
safer_gnutls_strerror(ret));
523
526
ret = gnutls_certificate_set_openpgp_key_file
524
(mc->cred, pubkeyfilename, seckeyfilename,
527
(mc.cred, pubkeyfilename, seckeyfilename,
525
528
GNUTLS_OPENPGP_FMT_BASE64);
526
529
if(ret != GNUTLS_E_SUCCESS){
527
530
fprintf_plus(stderr,
535
538
/* GnuTLS server initialization */
536
ret = gnutls_dh_params_init(&mc->dh_params);
539
ret = gnutls_dh_params_init(&mc.dh_params);
537
540
if(ret != GNUTLS_E_SUCCESS){
538
541
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
539
542
" initialization: %s\n",
540
543
safer_gnutls_strerror(ret));
543
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
546
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
544
547
if(ret != GNUTLS_E_SUCCESS){
545
548
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
546
549
safer_gnutls_strerror(ret));
550
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
553
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
556
gnutls_certificate_free_credentials(mc->cred);
559
gnutls_certificate_free_credentials(mc.cred);
557
560
gnutls_global_deinit();
558
gnutls_dh_params_deinit(mc->dh_params);
561
gnutls_dh_params_deinit(mc.dh_params);
562
static int init_gnutls_session(gnutls_session_t *session,
565
static int init_gnutls_session(gnutls_session_t *session){
565
567
/* GnuTLS session creation */
611
613
/* ignore client certificate if any. */
612
614
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
614
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
616
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
621
623
__attribute__((unused)) const char *txt){}
623
625
/* Called when a Mandos server is found */
624
static int start_mandos_communication(const char *ip, in_port_t port,
626
static int start_mandos_communication(const char *ip, uint16_t port,
625
627
AvahiIfIndex if_index,
626
int af, mandos_context *mc){
627
629
int ret, tcp_sd = -1;
662
/* If the interface is specified and we have a list of interfaces */
663
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
664
/* Check if the interface is one of the interfaces we are using */
667
char *interface = NULL;
668
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
670
if(if_nametoindex(interface) == (unsigned int)if_index){
677
/* This interface does not match any in the list, so we don't
678
connect to the server */
680
char interface[IF_NAMESIZE];
681
if(if_indextoname((unsigned int)if_index, interface) == NULL){
682
perror_plus("if_indextoname");
684
fprintf_plus(stderr, "Skipping server on non-used interface"
686
if_indextoname((unsigned int)if_index,
694
ret = init_gnutls_session(&session, mc);
664
ret = init_gnutls_session(&session);
700
670
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
701
PRIuMAX "\n", ip, (uintmax_t)port);
671
PRIu16 "\n", ip, port);
704
674
tcp_sd = socket(pf, SOCK_STREAM, 0);
737
707
if(af == AF_INET6){
738
to.in6.sin6_port = htons(port);
740
#pragma GCC diagnostic push
741
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
708
to.in6.sin6_port = htons(port); /* Spurious warnings from
710
-Wunreachable-code */
743
712
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
744
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
746
#pragma GCC diagnostic pop
713
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
748
715
if(if_index == AVAHI_IF_UNSPEC){
749
716
fprintf_plus(stderr, "An IPv6 link-local address is"
750
717
" incomplete without a network interface\n");
769
738
if(if_indextoname((unsigned int)if_index, interface) == NULL){
770
739
perror_plus("if_indextoname");
772
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
773
"\n", ip, interface, (uintmax_t)port);
741
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
742
"\n", ip, interface, port);
776
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
777
ip, (uintmax_t)port);
745
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
779
748
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
780
749
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1040
1009
AVAHI_GCC_UNUSED AvahiStringList *txt,
1041
1010
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1012
AVAHI_GCC_UNUSED void* userdata){
1048
1015
/* Called whenever a service has been resolved successfully or
1058
1025
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1059
1026
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1061
avahi_strerror(avahi_server_errno
1062
(((mandos_context*)mc)->server)));
1028
avahi_strerror(avahi_server_errno(mc.server)));
1065
1031
case AVAHI_RESOLVER_FOUND:
1071
1037
PRIdMAX ") on port %" PRIu16 "\n", name,
1072
1038
host_name, ip, (intmax_t)interface, port);
1074
int ret = start_mandos_communication(ip, (in_port_t)port,
1076
avahi_proto_to_af(proto),
1040
int ret = start_mandos_communication(ip, port, interface,
1041
avahi_proto_to_af(proto));
1079
avahi_simple_poll_quit(simple_poll);
1043
avahi_simple_poll_quit(mc.simple_poll);
1081
if(not add_server(ip, (in_port_t)port, interface,
1082
avahi_proto_to_af(proto),
1083
&((mandos_context*)mc)->current_server)){
1045
if(not add_server(ip, port, interface,
1046
avahi_proto_to_af(proto))){
1084
1047
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1085
1048
" list\n", name);
1116
1077
case AVAHI_BROWSER_FAILURE:
1118
1079
fprintf_plus(stderr, "(Avahi browser) %s\n",
1119
avahi_strerror(avahi_server_errno
1120
(((mandos_context*)mc)->server)));
1121
avahi_simple_poll_quit(simple_poll);
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
avahi_simple_poll_quit(mc.simple_poll);
1124
1084
case AVAHI_BROWSER_NEW:
1127
1087
the callback function is called the Avahi server will free the
1128
1088
resolver for us. */
1130
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1131
interface, protocol, name, type,
1132
domain, protocol, 0,
1133
resolve_callback, mc) == NULL)
1090
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1091
name, type, domain, protocol, 0,
1092
resolve_callback, NULL) == NULL)
1134
1093
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1136
avahi_strerror(avahi_server_errno
1137
(((mandos_context*)mc)->server)));
1095
avahi_strerror(avahi_server_errno(mc.server)));
1140
1098
case AVAHI_BROWSER_REMOVE:
1363
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1364
mandos_context *mc){
1321
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1366
1323
struct timespec now;
1367
1324
struct timespec waited_time;
1368
1325
intmax_t block_time;
1371
if(mc->current_server == NULL){
1328
if(mc.current_server == NULL){
1373
1330
fprintf_plus(stderr, "Wait until first server is found."
1374
1331
" No timeout!\n");
1388
1345
/* Calculating in ms how long time between now and server
1389
1346
who we visted longest time ago. Now - last seen. */
1390
1347
waited_time.tv_sec = (now.tv_sec
1391
- mc->current_server->last_seen.tv_sec);
1348
- mc.current_server->last_seen.tv_sec);
1392
1349
waited_time.tv_nsec = (now.tv_nsec
1393
- mc->current_server->last_seen.tv_nsec);
1350
- mc.current_server->last_seen.tv_nsec);
1394
1351
/* total time is 10s/10,000ms.
1395
1352
Converting to s from ms by dividing by 1,000,
1396
1353
and ns to ms by dividing by 1,000,000. */
1406
1363
if(block_time <= 0){
1407
ret = start_mandos_communication(mc->current_server->ip,
1408
mc->current_server->port,
1409
mc->current_server->if_index,
1410
mc->current_server->af, mc);
1364
ret = start_mandos_communication(mc.current_server->ip,
1365
mc.current_server->port,
1366
mc.current_server->if_index,
1367
mc.current_server->af);
1412
avahi_simple_poll_quit(s);
1369
avahi_simple_poll_quit(mc.simple_poll);
1415
1372
ret = clock_gettime(CLOCK_MONOTONIC,
1416
&mc->current_server->last_seen);
1373
&mc.current_server->last_seen);
1418
1375
perror_plus("clock_gettime");
1421
mc->current_server = mc->current_server->next;
1378
mc.current_server = mc.current_server->next;
1422
1379
block_time = 0; /* Call avahi to find new Mandos
1423
1380
servers, but don't block */
1493
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1495
1452
if(numhooks == -1){
1496
if(errno == ENOENT){
1498
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1499
" found\n", hookdir);
1502
perror_plus("scandir");
1453
perror_plus("scandir");
1505
1455
int devnull = open("/dev/null", O_RDONLY);
1506
1456
for(int i = 0; i < numhooks; i++){
1793
1743
int main(int argc, char *argv[]){
1794
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1795
.priority = "SECURE256:!CTYPE-X.509:"
1796
"+CTYPE-OPENPGP", .current_server = NULL,
1797
.interfaces = NULL, .interfaces_size = 0 };
1798
1744
AvahiSServiceBrowser *sb = NULL;
1799
1745
error_t ret_errno;
1801
1747
intmax_t tmpmax;
1803
1749
int exitcode = EXIT_SUCCESS;
1750
char *interfaces = NULL;
1751
size_t interfaces_size = 0;
1804
1752
char *interfaces_to_take_down = NULL;
1805
1753
size_t interfaces_to_take_down_size = 0;
1806
1754
char tempdir[] = "/tmp/mandosXXXXXX";
1906
1854
connect_to = arg;
1908
1856
case 'i': /* --interface */
1909
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1857
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1911
1859
if(ret_errno != 0){
1912
1860
argp_error(state, "%s", strerror(ret_errno));
2042
1990
/* Lower privileges */
1994
perror_plus("seteuid");
2047
/* Remove invalid interface names (except "none") */
1999
/* Remove empty interface names */
2049
2001
char *interface = NULL;
2050
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2002
while((interface = argz_next(interfaces, interfaces_size,
2052
if(strcmp(interface, "none") != 0
2053
and if_nametoindex(interface) == 0){
2054
if(interface[0] != '\0'){
2004
if(if_nametoindex(interface) == 0){
2005
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2055
2006
fprintf_plus(stderr, "Not using nonexisting interface"
2056
2007
" \"%s\"\n", interface);
2058
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2009
argz_delete(&interfaces, &interfaces_size, interface);
2059
2010
interface = NULL;
2064
2015
/* Run network hooks */
2066
if(mc.interfaces != NULL){
2067
interfaces_hooks = malloc(mc.interfaces_size);
2068
if(interfaces_hooks == NULL){
2069
perror_plus("malloc");
2072
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2073
interfaces_hooks_size = mc.interfaces_size;
2074
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2017
ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,
2018
interfaces, interfaces_size);
2021
perror_plus("argz_append");
2077
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2078
interfaces_hooks : "", delay)){
2024
argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');
2025
if(not run_network_hooks("start", interfaces_hooks, delay)){
2088
2035
from the signal handler */
2089
2036
/* Initialize the pseudo-RNG for Avahi */
2090
2037
srand((unsigned int) time(NULL));
2091
simple_poll = avahi_simple_poll_new();
2092
if(simple_poll == NULL){
2038
mc.simple_poll = avahi_simple_poll_new();
2039
if(mc.simple_poll == NULL){
2093
2040
fprintf_plus(stderr,
2094
2041
"Avahi: Failed to create simple poll object.\n");
2095
2042
exitcode = EX_UNAVAILABLE;
2162
2109
/* If no interfaces were specified, make a list */
2163
if(mc.interfaces == NULL){
2110
if(interfaces == NULL){
2164
2111
struct dirent **direntries;
2165
2112
/* Look for any good interfaces */
2166
2113
ret = scandir(sys_class_net, &direntries, good_interface,
2169
2116
/* Add all found interfaces to interfaces list */
2170
2117
for(int i = 0; i < ret; ++i){
2171
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2118
ret_errno = argz_add(&interfaces, &interfaces_size,
2172
2119
direntries[i]->d_name);
2173
2120
if(ret_errno != 0){
2174
2121
perror_plus("argz_add");
2191
/* Bring up interfaces which are down, and remove any "none"s */
2138
/* If we only got one interface, explicitly use only that one */
2139
if(argz_count(interfaces, interfaces_size) == 1){
2141
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2144
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2147
/* Bring up interfaces which are down */
2148
if(not (argz_count(interfaces, interfaces_size) == 1
2149
and strcmp(interfaces, "none") == 0)){
2193
2150
char *interface = NULL;
2194
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2151
while((interface = argz_next(interfaces, interfaces_size,
2196
/* If interface name is "none", stop bringing up interfaces.
2197
Also remove all instances of "none" from the list */
2198
if(strcmp(interface, "none") == 0){
2199
argz_delete(&mc.interfaces, &mc.interfaces_size,
2202
while((interface = argz_next(mc.interfaces,
2203
mc.interfaces_size, interface))){
2204
if(strcmp(interface, "none") == 0){
2205
argz_delete(&mc.interfaces, &mc.interfaces_size,
2212
2153
bool interface_was_up = interface_is_up(interface);
2213
2154
ret = bring_up_interface(interface, delay);
2214
2155
if(not interface_was_up){
2168
interfaces_size = 0;
2225
2169
if(debug and (interfaces_to_take_down == NULL)){
2226
2170
fprintf_plus(stderr, "No interfaces were brought up\n");
2230
/* If we only got one interface, explicitly use only that one */
2231
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2233
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2236
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2243
ret = init_gnutls_global(pubkey, seckey, &mc);
2178
ret = init_gnutls_global(pubkey, seckey);
2245
2180
fprintf_plus(stderr, "init_gnutls_global failed\n");
2246
2181
exitcode = EX_UNAVAILABLE;
2266
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2201
if(not init_gpgme(pubkey, seckey, tempdir)){
2267
2202
fprintf_plus(stderr, "init_gpgme failed\n");
2268
2203
exitcode = EX_UNAVAILABLE;
2295
2230
tmpmax = strtoimax(address+1, &tmp, 10);
2296
2231
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2297
or tmpmax != (in_port_t)tmpmax){
2232
or tmpmax != (uint16_t)tmpmax){
2298
2233
fprintf_plus(stderr, "Bad port number\n");
2299
2234
exitcode = EX_USAGE;
2307
port = (in_port_t)tmpmax;
2242
port = (uint16_t)tmpmax;
2308
2243
*address = '\0';
2309
2244
/* Colon in address indicates IPv6 */
2328
2263
while(not quit_now){
2329
ret = start_mandos_communication(address, port, if_index, af,
2264
ret = start_mandos_communication(address, port, if_index, af);
2331
2265
if(quit_now or ret == 0){
2359
2293
config.publish_domain = 0;
2361
2295
/* Allocate a new server */
2362
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2363
&config, NULL, NULL, &ret_errno);
2296
mc.server = avahi_server_new(avahi_simple_poll_get
2297
(mc.simple_poll), &config, NULL,
2365
2300
/* Free the Avahi configuration data */
2366
2301
avahi_server_config_free(&config);
2381
2316
/* Create the Avahi service browser */
2382
2317
sb = avahi_s_service_browser_new(mc.server, if_index,
2383
2318
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2384
NULL, 0, browse_callback,
2319
NULL, 0, browse_callback, NULL);
2386
2320
if(sb == NULL){
2387
2321
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2388
2322
avahi_strerror(avahi_server_errno(mc.server)));
2400
2334
fprintf_plus(stderr, "Starting Avahi loop search\n");
2403
ret = avahi_loop_with_timeout(simple_poll,
2404
(int)(retry_interval * 1000), &mc);
2337
ret = avahi_loop_with_timeout(mc.simple_poll,
2338
(int)(retry_interval * 1000));
2406
2340
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2407
2341
(ret == 0) ? "successfully" : "with error");
2416
2350
/* Cleanup things */
2417
free(mc.interfaces);
2420
2352
avahi_s_service_browser_free(sb);
2422
2354
if(mc.server != NULL)
2423
2355
avahi_server_free(mc.server);
2425
if(simple_poll != NULL)
2426
avahi_simple_poll_free(simple_poll);
2357
if(mc.simple_poll != NULL)
2358
avahi_simple_poll_free(mc.simple_poll);
2428
2360
if(gnutls_initialized){
2429
2361
gnutls_certificate_free_credentials(mc.cred);
2451
2383
raise_privileges();
2453
2385
/* Run network hooks */
2454
run_network_hooks("stop", interfaces_hooks != NULL ?
2455
interfaces_hooks : "", delay);
2386
run_network_hooks("stop", interfaces_hooks, delay);
2457
2388
/* Take down the network interfaces which were brought up */