157
164
const char *priority;
159
166
server *current_server;
168
size_t interfaces_size;
160
169
} mandos_context;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
168
174
sig_atomic_t quit_now = 0;
169
175
int signal_received = 0;
171
177
/* Function to use when printing errors */
172
178
void perror_plus(const char *print_text){
173
180
fprintf(stderr, "Mandos plugin %s: ",
174
181
program_invocation_short_name);
175
183
perror(print_text);
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
178
187
int fprintf_plus(FILE *stream, const char *format, ...){
180
189
va_start (ap, format);
182
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
192
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
189
198
* bytes. "buffer_capacity" is how much is currently allocated,
190
199
* "buffer_length" is how much is already used.
201
__attribute__((nonnull, warn_unused_result))
192
202
size_t incbuffer(char **buffer, size_t buffer_length,
193
203
size_t buffer_capacity){
194
204
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
int old_errno = errno;
199
214
buffer_capacity += BUFFER_SIZE;
201
216
return buffer_capacity;
204
219
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
220
__attribute__((nonnull, warn_unused_result))
221
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
int af, server **current_server){
208
224
server *new_server = malloc(sizeof(server));
209
225
if(new_server == NULL){
210
226
perror_plus("malloc");
213
229
*new_server = (server){ .ip = strdup(ip),
217
233
if(new_server->ip == NULL){
218
234
perror_plus("strdup");
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
perror_plus("clock_gettime");
221
242
/* Special case of first server */
222
if (mc.current_server == NULL){
243
if(*current_server == NULL){
223
244
new_server->next = new_server;
224
245
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
246
*current_server = new_server;
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
248
/* Place the new server last in the list */
249
new_server->next = *current_server;
250
new_server->prev = (*current_server)->prev;
230
251
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
perror_plus("clock_gettime");
252
(*current_server)->prev = new_server;
242
258
* Initialize GPGME.
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
246
265
gpgme_error_t rc;
247
266
gpgme_engine_info_t engine_info;
251
269
* Helper function to insert pub and seckey to the engine keyring.
253
bool import_key(const char *filename){
271
bool import_key(const char * const filename){
256
274
gpgme_data_t pgp_data;
529
552
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
553
ret = gnutls_dh_params_init(&mc->dh_params);
531
554
if(ret != GNUTLS_E_SUCCESS){
532
555
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
556
" initialization: %s\n",
534
557
safer_gnutls_strerror(ret));
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
560
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
538
561
if(ret != GNUTLS_E_SUCCESS){
539
562
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
563
safer_gnutls_strerror(ret));
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
567
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
550
gnutls_certificate_free_credentials(mc.cred);
573
gnutls_certificate_free_credentials(mc->cred);
551
574
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
575
gnutls_dh_params_deinit(mc->dh_params);
556
static int init_gnutls_session(gnutls_session_t *session){
579
__attribute__((nonnull, warn_unused_result))
580
static int init_gnutls_session(gnutls_session_t *session,
558
583
/* GnuTLS session creation */
655
ret = init_gnutls_session(&session);
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
if(if_nametoindex(interface) == (unsigned int)if_index){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
700
fprintf_plus(stderr, "Skipping server on non-used interface"
702
if_indextoname((unsigned int)if_index,
710
ret = init_gnutls_session(&session, mc);
661
716
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
717
PRIuMAX "\n", ip, (uintmax_t)port);
665
720
tcp_sd = socket(pf, SOCK_STREAM, 0);
729
778
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
779
perror_plus("if_indextoname");
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
781
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
782
"\n", ip, interface, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
785
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
786
ip, (uintmax_t)port);
739
788
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
789
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
790
if(af == AF_INET6){
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
750
perror_plus("inet_ntop");
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1025
1086
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
1087
host_name, ip, (intmax_t)interface, port);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1089
int ret = start_mandos_communication(ip, (in_port_t)port,
1091
avahi_proto_to_af(proto),
1031
avahi_simple_poll_quit(mc.simple_poll);
1094
avahi_simple_poll_quit(simple_poll);
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1096
if(not add_server(ip, (in_port_t)port, interface,
1097
avahi_proto_to_af(proto),
1098
&((mandos_context*)mc)->current_server)){
1099
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1072
1142
the callback function is called the Avahi server will free the
1073
1143
resolver for us. */
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1145
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1146
interface, protocol, name, type,
1147
domain, protocol, 0,
1148
resolve_callback, mc) == NULL)
1078
1149
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1080
avahi_strerror(avahi_server_errno(mc.server)));
1151
avahi_strerror(avahi_server_errno
1152
(((mandos_context*)mc)->server)));
1083
1155
case AVAHI_BROWSER_REMOVE:
1102
1174
signal_received = sig;
1103
1175
int old_errno = errno;
1104
1176
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1177
if(simple_poll != NULL){
1178
avahi_simple_poll_quit(simple_poll);
1108
1180
errno = old_errno;
1183
__attribute__((nonnull, warn_unused_result))
1111
1184
bool get_flags(const char *ifname, struct ifreq *ifr){
1114
1188
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1116
1191
perror_plus("socket");
1119
1195
strcpy(ifr->ifr_name, ifname);
1120
1196
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1123
1200
perror_plus("ioctl SIOCGIFFLAGS");
1208
__attribute__((nonnull, warn_unused_result))
1130
1209
bool good_flags(const char *ifname, const struct ifreq *ifr){
1132
1211
/* Reject the loopback device */
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1208
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1234
if(not good_flags(if_entry->d_name, &ifr)){
1278
* This function determines if a network interface is up.
1280
__attribute__((nonnull, warn_unused_result))
1281
bool interface_is_up(const char *interface){
1283
if(not get_flags(interface, &ifr)){
1285
fprintf_plus(stderr, "Failed to get flags for interface "
1286
"\"%s\"\n", interface);
1291
return (bool)(ifr.ifr_flags & IFF_UP);
1295
* This function determines if a network interface is running
1297
__attribute__((nonnull, warn_unused_result))
1298
bool interface_is_running(const char *interface){
1300
if(not get_flags(interface, &ifr)){
1302
fprintf_plus(stderr, "Failed to get flags for interface "
1303
"\"%s\"\n", interface);
1308
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
__attribute__((nonnull, pure, warn_unused_result))
1240
1312
int notdotentries(const struct dirent *direntry){
1241
1313
/* Skip "." and ".." */
1242
1314
if(direntry->d_name[0] == '.'
1346
1421
- ((intmax_t)waited_time.tv_sec * 1000))
1347
1422
- ((intmax_t)waited_time.tv_nsec / 1000000));
1350
1425
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
1429
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1430
ret = start_mandos_communication(mc->current_server->ip,
1431
mc->current_server->port,
1432
mc->current_server->if_index,
1433
mc->current_server->af, mc);
1360
avahi_simple_poll_quit(mc.simple_poll);
1435
avahi_simple_poll_quit(s);
1363
1438
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1439
&mc->current_server->last_seen);
1366
1441
perror_plus("clock_gettime");
1369
mc.current_server = mc.current_server->next;
1444
mc->current_server = mc->current_server->next;
1370
1445
block_time = 0; /* Call avahi to find new Mandos
1371
1446
servers, but don't block */
1374
1449
ret = avahi_simple_poll_iterate(s, (int)block_time);
1377
if (ret > 0 or errno != EINTR){
1452
if(ret > 0 or errno != EINTR){
1378
1453
return (ret != 1) ? ret : 0;
1384
bool run_network_hooks(const char *mode, const char *interface,
1459
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
error_t raise_privileges(void){
1462
error_t old_errno = errno;
1463
error_t ret_errno = 0;
1464
if(seteuid(0) == -1){
1466
perror_plus("seteuid");
1472
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
error_t raise_privileges_permanently(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = raise_privileges();
1481
if(setuid(0) == -1){
1483
perror_plus("seteuid");
1489
/* Set effective user ID to unprivileged saved user ID */
1490
__attribute__((warn_unused_result))
1491
error_t lower_privileges(void){
1492
error_t old_errno = errno;
1493
error_t ret_errno = 0;
1494
if(seteuid(uid) == -1){
1496
perror_plus("seteuid");
1502
/* Lower privileges permanently */
1503
__attribute__((warn_unused_result))
1504
error_t lower_privileges_permanently(void){
1505
error_t old_errno = errno;
1506
error_t ret_errno = 0;
1507
if(setuid(uid) == -1){
1509
perror_plus("setuid");
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1385
1517
const float delay){
1386
1518
struct dirent **direntries;
1387
struct dirent *direntry;
1389
1519
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1391
1521
if(numhooks == -1){
1392
perror_plus("scandir");
1522
if(errno == ENOENT){
1524
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1525
" found\n", hookdir);
1528
perror_plus("scandir");
1531
struct dirent *direntry;
1394
1533
int devnull = open("/dev/null", O_RDONLY);
1395
1534
for(int i = 0; i < numhooks; i++){
1396
1535
direntry = direntries[i];
1408
1547
if(hook_pid == 0){
1410
1549
/* Raise privileges */
1414
perror_plus("seteuid");
1416
/* Raise privileges even more */
1420
perror_plus("setuid");
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1422
1554
/* Set group */
1424
1556
ret = setgid(0);
1426
1558
perror_plus("setgid");
1428
1561
/* Reset supplementary groups */
1430
1563
ret = setgroups(0, NULL);
1432
1565
perror_plus("setgroups");
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1568
ret = dup2(devnull, STDIN_FILENO);
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1573
ret = close(devnull);
1575
perror_plus("close");
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1439
1583
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
1585
perror_plus("setenv");
1508
1661
close(devnull);
1665
__attribute__((nonnull, warn_unused_result))
1666
error_t bring_up_interface(const char *const interface,
1668
error_t old_errno = errno;
1670
struct ifreq network;
1671
unsigned int if_index = if_nametoindex(interface);
1673
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1683
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1687
fprintf_plus(stderr, "Failed to get flags for interface "
1688
"\"%s\"\n", interface);
1692
network.ifr_flags |= IFF_UP; /* set flag */
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1697
perror_plus("socket");
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
perror_plus("close");
1712
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1720
perror_plus("Failed to raise privileges");
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1731
restore_loglevel = true;
1734
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1738
if(restore_loglevel){
1739
ret_linux = klogctl(7, NULL, 0);
1740
if(ret_linux == -1){
1741
perror_plus("klogctl");
1744
#endif /* __linux__ */
1746
/* If raise_privileges() succeeded above */
1748
/* Lower privileges */
1749
ret_errno = lower_privileges();
1752
perror_plus("Failed to lower privileges");
1756
/* Close the socket */
1757
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1759
perror_plus("close");
1762
if(ret_setflags == -1){
1763
errno = ioctl_errno;
1764
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1769
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1773
/* Sleep checking until interface is running.
1774
Check every 0.25s, up to total time of delay */
1775
for(int i=0; i < delay * 4; i++){
1776
if(interface_is_running(interface)){
1779
struct timespec sleeptime = { .tv_nsec = 250000000 };
1780
ret = nanosleep(&sleeptime, NULL);
1781
if(ret == -1 and errno != EINTR){
1782
perror_plus("nanosleep");
1790
__attribute__((nonnull, warn_unused_result))
1791
error_t take_down_interface(const char *const interface){
1792
error_t old_errno = errno;
1793
struct ifreq network;
1794
unsigned int if_index = if_nametoindex(interface);
1796
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1800
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
if(not get_flags(interface, &network) and debug){
1804
fprintf_plus(stderr, "Failed to get flags for interface "
1805
"\"%s\"\n", interface);
1809
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1814
perror_plus("socket");
1820
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1827
perror_plus("Failed to raise privileges");
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1832
/* If raise_privileges() succeeded above */
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1838
perror_plus("Failed to lower privileges");
1842
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1845
perror_plus("close");
1848
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1855
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1513
1863
int main(int argc, char *argv[]){
1864
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1867
.interfaces = NULL, .interfaces_size = 0 };
1514
1868
AvahiSServiceBrowser *sb = NULL;
1517
1871
intmax_t tmpmax;
1519
1873
int exitcode = EXIT_SUCCESS;
1520
const char *interface = "";
1521
struct ifreq network;
1523
bool take_down_interface = false;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
1874
char *interfaces_to_take_down = NULL;
1875
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
1528
1879
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1529
1880
const char *seckey = PATHDIR "/" SECKEY;
1530
1881
const char *pubkey = PATHDIR "/" PUBKEY;
1882
char *interfaces_hooks = NULL;
1532
1884
bool gnutls_initialized = false;
1533
1885
bool gpgme_initialized = false;
1762
2116
/* Lower privileges */
1766
perror_plus("seteuid");
2117
ret_errno = lower_privileges();
2120
perror_plus("Failed to lower privileges");
2125
/* Remove invalid interface names (except "none") */
2127
char *interface = NULL;
2128
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2130
if(strcmp(interface, "none") != 0
2131
and if_nametoindex(interface) == 0){
2132
if(interface[0] != '\0'){
2133
fprintf_plus(stderr, "Not using nonexisting interface"
2134
" \"%s\"\n", interface);
2136
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1771
2142
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
2144
if(mc.interfaces != NULL){
2145
interfaces_hooks = malloc(mc.interfaces_size);
2146
if(interfaces_hooks == NULL){
2147
perror_plus("malloc");
2150
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
1777
2158
avahi_set_log_function(empty_log);
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1786
/* No up interfaces, look for any good interfaces */
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1797
if(interface == NULL){
1798
perror_plus("malloc");
1800
exitcode = EXIT_FAILURE;
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1812
2161
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
2162
from the signal handler */
1814
2163
/* Initialize the pseudo-RNG for Avahi */
1815
2164
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
2165
simple_poll = avahi_simple_poll_new();
2166
if(simple_poll == NULL){
1818
2167
fprintf_plus(stderr,
1819
2168
"Avahi: Failed to create simple poll object.\n");
1820
2169
exitcode = EX_UNAVAILABLE;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1900
/* Re-raise priviliges */
1904
perror_plus("seteuid");
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1916
#endif /* __linux__ */
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1926
perror_plus("klogctl");
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1934
perror_plus("seteuid");
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
perror_plus("ioctl SIOCGIFFLAGS");
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1946
perror_plus("klogctl");
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1955
perror_plus("seteuid");
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1971
perror_plus("klogctl");
2236
/* If no interfaces were specified, make a list */
2237
if(mc.interfaces == NULL){
2238
struct dirent **direntries;
2239
/* Look for any good interfaces */
2240
ret = scandir(sys_class_net, &direntries, good_interface,
2243
/* Add all found interfaces to interfaces list */
2244
for(int i = 0; i < ret; ++i){
2245
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2246
direntries[i]->d_name);
2249
perror_plus("argz_add");
2253
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2254
direntries[i]->d_name);
2260
fprintf_plus(stderr, "Could not find a network interface\n");
2261
exitcode = EXIT_FAILURE;
2266
/* Bring up interfaces which are down, and remove any "none"s */
2268
char *interface = NULL;
2269
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2271
/* If interface name is "none", stop bringing up interfaces.
2272
Also remove all instances of "none" from the list */
2273
if(strcmp(interface, "none") == 0){
2274
argz_delete(&mc.interfaces, &mc.interfaces_size,
2277
while((interface = argz_next(mc.interfaces,
2278
mc.interfaces_size, interface))){
2279
if(strcmp(interface, "none") == 0){
2280
argz_delete(&mc.interfaces, &mc.interfaces_size,
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1979
perror_plus("seteuid");
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
perror_plus("close");
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2011
perror_plus("klogctl");
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2017
/* Lower privileges */
2020
perror_plus("seteuid");
2287
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2289
if(not interface_was_up){
2291
perror_plus("Failed to bring up interface");
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2297
perror_plus("argz_add");
2302
if(debug and (interfaces_to_take_down == NULL)){
2303
fprintf_plus(stderr, "No interfaces were brought up\n");
2307
/* If we only got one interface, explicitly use only that one */
2308
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2310
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2313
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2028
ret = init_gnutls_global(pubkey, seckey);
2320
ret = init_gnutls_global(pubkey, seckey, &mc);
2030
2322
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
2323
exitcode = EX_UNAVAILABLE;
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2233
/* Re-raise priviliges */
2534
/* Re-raise privileges */
2238
perror_plus("seteuid");
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2255
perror_plus("close");
2259
/* Lower privileges permanently */
2263
perror_plus("setuid");
2536
ret_errno = raise_privileges();
2538
perror_plus("Failed to raise privileges");
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2545
/* Take down the network interfaces which were brought up */
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2551
ret_errno = take_down_interface(interface);
2554
perror_plus("Failed to take down interface");
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2563
ret_errno = lower_privileges_permanently();
2565
perror_plus("Failed to lower privileges permanently");
2569
free(interfaces_to_take_down);
2570
free(interfaces_hooks);
2266
2572
/* Removes the GPGME temp directory and all files inside */
2267
if(tempdir_created){
2573
if(tempdir != NULL){
2268
2574
struct dirent **direntries = NULL;
2269
2575
struct dirent *direntry = NULL;
2270
2576
int numentries = scandir(tempdir, &direntries, notdotentries,
2272
if (numentries > 0){
2273
2579
for(int i = 0; i < numentries; i++){
2274
2580
direntry = direntries[i];
2275
2581
char *fullname = NULL;