1074
/* Signal handler that stops main loop after SIGTERM */
1075
static void handle_sigterm(int sig){
1080
signal_received = sig;
1081
int old_errno = errno;
1082
/* set main loop to exit */
1083
if(mc.simple_poll != NULL){
1084
avahi_simple_poll_quit(mc.simple_poll);
1089
bool get_flags(const char *ifname, struct ifreq *ifr){
1092
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1094
perror_plus("socket");
1097
strcpy(ifr->ifr_name, ifname);
1098
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1101
perror_plus("ioctl SIOCGIFFLAGS");
1108
bool good_flags(const char *ifname, const struct ifreq *ifr){
1110
/* Reject the loopback device */
1111
if(ifr->ifr_flags & IFF_LOOPBACK){
1113
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1118
/* Accept point-to-point devices only if connect_to is specified */
1119
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1121
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1126
/* Otherwise, reject non-broadcast-capable devices */
1127
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1129
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1134
/* Reject non-ARP interfaces (including dummy interfaces) */
1135
if(ifr->ifr_flags & IFF_NOARP){
1137
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1142
/* Accept this device */
1144
fprintf(stderr, "Interface \"%s\" is good\n", ifname);
1150
* This function determines if a directory entry in /sys/class/net
1151
* corresponds to an acceptable network device.
1152
* (This function is passed to scandir(3) as a filter function.)
1154
int good_interface(const struct dirent *if_entry){
1156
if(if_entry->d_name[0] == '.'){
1161
if(not get_flags(if_entry->d_name, &ifr)){
1165
if(not good_flags(if_entry->d_name, &ifr)){
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device which is up.
1174
* (This function is passed to scandir(3) as a filter function.)
1176
int up_interface(const struct dirent *if_entry){
1178
char *flagname = NULL;
1179
if(if_entry->d_name[0] == '.'){
1182
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1185
perror_plus("asprintf");
1188
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1190
perror_plus("open");
1195
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1196
/* read line from flags_fd */
1197
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1198
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1199
flagstring[(size_t)to_read] = '\0';
1200
if(flagstring == NULL){
1201
perror_plus("malloc");
1206
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1209
perror_plus("read");
1223
tmpmax = strtoimax(flagstring, &tmp, 0);
1224
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1225
and not (isspace(*tmp)))
1226
or tmpmax != (ifreq_flags)tmpmax){
1228
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1229
flagstring, if_entry->d_name);
1235
ifreq_flags flags = (ifreq_flags)tmpmax;
1236
/* Reject the loopback device */
1237
if(flags & IFF_LOOPBACK){
1239
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1245
/* Reject down interfaces */
1246
if(not (flags & IFF_UP)){
1250
/* Accept point-to-point devices only if connect_to is specified */
1251
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1253
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1258
/* Otherwise, reject non-broadcast-capable devices */
1259
if(not (flags & IFF_BROADCAST)){
1261
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1266
/* Reject non-ARP interfaces (including dummy interfaces) */
1267
if(flags & IFF_NOARP){
1269
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1274
/* Accept this device */
1276
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1282
int notdotentries(const struct dirent *direntry){
1283
/* Skip "." and ".." */
1284
if(direntry->d_name[0] == '.'
1285
and (direntry->d_name[1] == '\0'
1286
or (direntry->d_name[1] == '.'
1287
and direntry->d_name[2] == '\0'))){
1293
/* Is this directory entry a runnable program? */
1294
int runnable_hook(const struct dirent *direntry){
1298
if((direntry->d_name)[0] == '\0'){
1303
/* Save pointer to last character */
1304
char *end = strchr(direntry->d_name, '\0')-1;
1311
if(((direntry->d_name)[0] == '#')
1313
/* Temporary #name# */
1317
/* XXX more rules here */
1319
ret = stat(direntry->d_name, &st);
1322
perror_plus("Could not stat plugin");
1326
if(not (st.st_mode & S_ISREG)){
1327
/* Not a regular file */
1330
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1331
/* Not executable */
1337
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1339
struct timespec now;
1340
struct timespec waited_time;
1341
intmax_t block_time;
1344
if(mc.current_server == NULL){
1347
"Wait until first server is found. No timeout!\n");
1349
ret = avahi_simple_poll_iterate(s, -1);
1352
fprintf(stderr, "Check current_server if we should run it,"
1355
/* the current time */
1356
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1358
perror_plus("clock_gettime");
1361
/* Calculating in ms how long time between now and server
1362
who we visted longest time ago. Now - last seen. */
1363
waited_time.tv_sec = (now.tv_sec
1364
- mc.current_server->last_seen.tv_sec);
1365
waited_time.tv_nsec = (now.tv_nsec
1366
- mc.current_server->last_seen.tv_nsec);
1367
/* total time is 10s/10,000ms.
1368
Converting to s from ms by dividing by 1,000,
1369
and ns to ms by dividing by 1,000,000. */
1370
block_time = ((retry_interval
1371
- ((intmax_t)waited_time.tv_sec * 1000))
1372
- ((intmax_t)waited_time.tv_nsec / 1000000));
1375
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1378
if(block_time <= 0){
1379
ret = start_mandos_communication(mc.current_server->ip,
1380
mc.current_server->port,
1381
mc.current_server->if_index,
1382
mc.current_server->af);
1384
avahi_simple_poll_quit(mc.simple_poll);
1387
ret = clock_gettime(CLOCK_MONOTONIC,
1388
&mc.current_server->last_seen);
1390
perror_plus("clock_gettime");
1393
mc.current_server = mc.current_server->next;
1394
block_time = 0; /* Call avahi to find new Mandos
1395
servers, but don't block */
1398
ret = avahi_simple_poll_iterate(s, (int)block_time);
1401
if (ret > 0 or errno != EINTR) {
1402
return (ret != 1) ? ret : 0;
810
1408
int main(int argc, char *argv[]){
811
AvahiSServiceBrowser *sb = NULL;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
840
{ .name = "interface", .key = 'i',
842
.doc = "Interface that will be used to search for Mandos"
845
{ .name = "seckey", .key = 's',
847
.doc = "OpenPGP secret key file base name",
849
{ .name = "pubkey", .key = 'p',
851
.doc = "OpenPGP public key file base name",
853
{ .name = "dh-bits", .key = 129,
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
858
{ .name = "priority", .key = 130,
860
.doc = "GnuTLS priority string for the TLS handshake",
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
870
case 128: /* --debug */
873
case 'c': /* --connect */
876
case 'i': /* --interface */
879
case 's': /* --seckey */
882
case 'p': /* --pubkey */
885
case 129: /* --dh-bits */
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
893
case 130: /* --priority */
901
return ARGP_ERR_UNKNOWN;
906
struct argp argp = { .options = options, .parser = parse_opt,
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
918
/* If the interface is down, bring it up */
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
923
exitcode = EXIT_FAILURE;
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
942
ret = TEMP_FAILURE_RETRY(close(sd));
961
ret = init_gnutls_global(&mc, pubkey, seckey);
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
967
gnutls_initalized = true;
970
if(mkdtemp(tempdir) == NULL){
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
981
gpgme_initalized = true;
1409
AvahiSServiceBrowser *sb = NULL;
1414
int exitcode = EXIT_SUCCESS;
1415
const char *interface = "";
1416
struct ifreq network;
1418
bool take_down_interface = false;
1421
char tempdir[] = "/tmp/mandosXXXXXX";
1422
bool tempdir_created = false;
1423
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1424
const char *seckey = PATHDIR "/" SECKEY;
1425
const char *pubkey = PATHDIR "/" PUBKEY;
1427
bool gnutls_initialized = false;
1428
bool gpgme_initialized = false;
1430
double retry_interval = 10; /* 10s between trying a server and
1431
retrying the same server again */
1433
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1434
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1439
/* Lower any group privileges we might have, just to be safe */
1443
perror_plus("setgid");
1446
/* Lower user privileges (temporarily) */
1450
perror_plus("seteuid");
1458
struct argp_option options[] = {
1459
{ .name = "debug", .key = 128,
1460
.doc = "Debug mode", .group = 3 },
1461
{ .name = "connect", .key = 'c',
1462
.arg = "ADDRESS:PORT",
1463
.doc = "Connect directly to a specific Mandos server",
1465
{ .name = "interface", .key = 'i',
1467
.doc = "Network interface that will be used to search for"
1470
{ .name = "seckey", .key = 's',
1472
.doc = "OpenPGP secret key file base name",
1474
{ .name = "pubkey", .key = 'p',
1476
.doc = "OpenPGP public key file base name",
1478
{ .name = "dh-bits", .key = 129,
1480
.doc = "Bit length of the prime number used in the"
1481
" Diffie-Hellman key exchange",
1483
{ .name = "priority", .key = 130,
1485
.doc = "GnuTLS priority string for the TLS handshake",
1487
{ .name = "delay", .key = 131,
1489
.doc = "Maximum delay to wait for interface startup",
1491
{ .name = "retry", .key = 132,
1493
.doc = "Retry interval used when denied by the mandos server",
1496
* These reproduce what we would get without ARGP_NO_HELP
1498
{ .name = "help", .key = '?',
1499
.doc = "Give this help list", .group = -1 },
1500
{ .name = "usage", .key = -3,
1501
.doc = "Give a short usage message", .group = -1 },
1502
{ .name = "version", .key = 'V',
1503
.doc = "Print program version", .group = -1 },
1507
error_t parse_opt(int key, char *arg,
1508
struct argp_state *state){
1511
case 128: /* --debug */
1514
case 'c': /* --connect */
1517
case 'i': /* --interface */
1520
case 's': /* --seckey */
1523
case 'p': /* --pubkey */
1526
case 129: /* --dh-bits */
1528
tmpmax = strtoimax(arg, &tmp, 10);
1529
if(errno != 0 or tmp == arg or *tmp != '\0'
1530
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1531
argp_error(state, "Bad number of DH bits");
1533
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1535
case 130: /* --priority */
1538
case 131: /* --delay */
1540
delay = strtof(arg, &tmp);
1541
if(errno != 0 or tmp == arg or *tmp != '\0'){
1542
argp_error(state, "Bad delay");
1544
case 132: /* --retry */
1546
retry_interval = strtod(arg, &tmp);
1547
if(errno != 0 or tmp == arg or *tmp != '\0'
1548
or (retry_interval * 1000) > INT_MAX
1549
or retry_interval < 0){
1550
argp_error(state, "Bad retry interval");
1554
* These reproduce what we would get without ARGP_NO_HELP
1556
case '?': /* --help */
1557
argp_state_help(state, state->out_stream,
1558
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1559
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1560
case -3: /* --usage */
1561
argp_state_help(state, state->out_stream,
1562
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1563
case 'V': /* --version */
1564
fprintf(state->out_stream, "%s\n", argp_program_version);
1565
exit(argp_err_exit_status);
1568
return ARGP_ERR_UNKNOWN;
1573
struct argp argp = { .options = options, .parser = parse_opt,
1575
.doc = "Mandos client -- Get and decrypt"
1576
" passwords from a Mandos server" };
1577
ret = argp_parse(&argp, argc, argv,
1578
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1585
perror_plus("argp_parse");
1586
exitcode = EX_OSERR;
1589
exitcode = EX_USAGE;
1595
/* Work around Debian bug #633582:
1596
<http://bugs.debian.org/633582> */
1599
/* Re-raise priviliges */
1603
perror_plus("seteuid");
1606
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1607
int seckey_fd = open(seckey, O_RDONLY);
1608
if(seckey_fd == -1){
1609
perror_plus("open");
1611
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1613
perror_plus("fstat");
1615
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1616
ret = fchown(seckey_fd, uid, gid);
1618
perror_plus("fchown");
1622
TEMP_FAILURE_RETRY(close(seckey_fd));
1626
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1627
int pubkey_fd = open(pubkey, O_RDONLY);
1628
if(pubkey_fd == -1){
1629
perror_plus("open");
1631
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1633
perror_plus("fstat");
1635
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1636
ret = fchown(pubkey_fd, uid, gid);
1638
perror_plus("fchown");
1642
TEMP_FAILURE_RETRY(close(pubkey_fd));
1646
/* Lower privileges */
1650
perror_plus("seteuid");
1654
/* Find network hooks and run them */
1656
struct dirent **direntries;
1657
struct dirent *direntry;
1658
int numhooks = scandir(HOOKDIR, &direntries, runnable_hook,
1660
int devnull = open("/dev/null", O_RDONLY);
1661
for(int i = 0; i < numhooks; i++){
1662
direntry = direntries[0];
1663
char *fullname = NULL;
1664
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
perror_plus("asprintf");
1670
pid_t hook_pid = fork();
1673
dup2(devnull, STDIN_FILENO);
1675
dup2(STDERR_FILENO, STDOUT_FILENO);
1676
setenv("DEVICE", interface, 1);
1677
setenv("VERBOSE", debug ? "1" : "0", 1);
1678
setenv("MODE", "start", 1);
1679
/* setenv( XXX more here */
1680
ret = execl(fullname, direntry->d_name, "start");
1681
perror_plus("execl");
1692
avahi_set_log_function(empty_log);
1695
if(interface[0] == '\0'){
1696
struct dirent **direntries;
1697
ret = scandir(sys_class_net, &direntries, good_interface,
1700
/* Pick the first good interface */
1701
interface = strdup(direntries[0]->d_name);
1703
fprintf(stderr, "Using interface \"%s\"\n", interface);
1705
if(interface == NULL){
1706
perror_plus("malloc");
1708
exitcode = EXIT_FAILURE;
1714
fprintf(stderr, "Could not find a network interface\n");
1715
exitcode = EXIT_FAILURE;
1720
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1721
from the signal handler */
1722
/* Initialize the pseudo-RNG for Avahi */
1723
srand((unsigned int) time(NULL));
1724
mc.simple_poll = avahi_simple_poll_new();
1725
if(mc.simple_poll == NULL){
1726
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1727
exitcode = EX_UNAVAILABLE;
1731
sigemptyset(&sigterm_action.sa_mask);
1732
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1734
perror_plus("sigaddset");
1735
exitcode = EX_OSERR;
1738
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1740
perror_plus("sigaddset");
1741
exitcode = EX_OSERR;
1744
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1746
perror_plus("sigaddset");
1747
exitcode = EX_OSERR;
1750
/* Need to check if the handler is SIG_IGN before handling:
1751
| [[info:libc:Initial Signal Actions]] |
1752
| [[info:libc:Basic Signal Handling]] |
1754
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1756
perror_plus("sigaction");
1759
if(old_sigterm_action.sa_handler != SIG_IGN){
1760
ret = sigaction(SIGINT, &sigterm_action, NULL);
1762
perror_plus("sigaction");
1763
exitcode = EX_OSERR;
1767
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1769
perror_plus("sigaction");
1772
if(old_sigterm_action.sa_handler != SIG_IGN){
1773
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1775
perror_plus("sigaction");
1776
exitcode = EX_OSERR;
1780
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1782
perror_plus("sigaction");
1785
if(old_sigterm_action.sa_handler != SIG_IGN){
1786
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1788
perror_plus("sigaction");
1789
exitcode = EX_OSERR;
1794
/* If the interface is down, bring it up */
1795
if(strcmp(interface, "none") != 0){
984
1796
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
1797
if(if_index == 0){
986
1798
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
if(connect_to != NULL){
991
/* Connect directly, do not use Zeroconf */
992
/* (Mainly meant for debugging) */
993
char *address = strrchr(connect_to, ':');
995
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
1007
address = connect_to;
1008
ret = start_mandos_communication(address, port, if_index, &mc);
1010
exitcode = EXIT_FAILURE;
1012
exitcode = EXIT_SUCCESS;
1018
avahi_set_log_function(empty_log);
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1024
/* Allocate main Avahi loop object */
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if (mc.simple_poll == NULL) {
1027
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
exitcode = EXIT_FAILURE;
1034
AvahiServerConfig config;
1035
/* Do not publish any local Zeroconf records */
1036
avahi_server_config_init(&config);
1037
config.publish_hinfo = 0;
1038
config.publish_addresses = 0;
1039
config.publish_workstation = 0;
1040
config.publish_domain = 0;
1042
/* Allocate a new server */
1043
mc.server = avahi_server_new(avahi_simple_poll_get
1044
(mc.simple_poll), &config, NULL,
1047
/* Free the Avahi configuration data */
1048
avahi_server_config_free(&config);
1051
/* Check if creating the Avahi server object succeeded */
1052
if (mc.server == NULL) {
1053
fprintf(stderr, "Failed to create Avahi server: %s\n",
1054
avahi_strerror(error));
1055
exitcode = EXIT_FAILURE;
1059
/* Create the Avahi service browser */
1060
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
"_mandos._tcp", NULL, 0,
1063
browse_callback, &mc);
1065
fprintf(stderr, "Failed to create service browser: %s\n",
1066
avahi_strerror(avahi_server_errno(mc.server)));
1067
exitcode = EXIT_FAILURE;
1071
/* Run the main loop */
1074
fprintf(stderr, "Starting Avahi loop search\n");
1077
avahi_simple_poll_loop(mc.simple_poll);
1799
exitcode = EX_UNAVAILABLE;
1807
/* Re-raise priviliges */
1811
perror_plus("seteuid");
1815
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1816
messages about the network interface to mess up the prompt */
1817
ret = klogctl(8, NULL, 5);
1818
bool restore_loglevel = true;
1820
restore_loglevel = false;
1821
perror_plus("klogctl");
1823
#endif /* __linux__ */
1825
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1827
perror_plus("socket");
1828
exitcode = EX_OSERR;
1830
if(restore_loglevel){
1831
ret = klogctl(7, NULL, 0);
1833
perror_plus("klogctl");
1836
#endif /* __linux__ */
1837
/* Lower privileges */
1841
perror_plus("seteuid");
1845
strcpy(network.ifr_name, interface);
1846
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1848
perror_plus("ioctl SIOCGIFFLAGS");
1850
if(restore_loglevel){
1851
ret = klogctl(7, NULL, 0);
1853
perror_plus("klogctl");
1856
#endif /* __linux__ */
1857
exitcode = EX_OSERR;
1858
/* Lower privileges */
1862
perror_plus("seteuid");
1866
if((network.ifr_flags & IFF_UP) == 0){
1867
network.ifr_flags |= IFF_UP;
1868
take_down_interface = true;
1869
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1871
take_down_interface = false;
1872
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1873
exitcode = EX_OSERR;
1875
if(restore_loglevel){
1876
ret = klogctl(7, NULL, 0);
1878
perror_plus("klogctl");
1881
#endif /* __linux__ */
1882
/* Lower privileges */
1886
perror_plus("seteuid");
1891
/* Sleep checking until interface is running.
1892
Check every 0.25s, up to total time of delay */
1893
for(int i=0; i < delay * 4; i++){
1894
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1896
perror_plus("ioctl SIOCGIFFLAGS");
1897
} else if(network.ifr_flags & IFF_RUNNING){
1900
struct timespec sleeptime = { .tv_nsec = 250000000 };
1901
ret = nanosleep(&sleeptime, NULL);
1902
if(ret == -1 and errno != EINTR){
1903
perror_plus("nanosleep");
1906
if(not take_down_interface){
1907
/* We won't need the socket anymore */
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1910
perror_plus("close");
1914
if(restore_loglevel){
1915
/* Restores kernel loglevel to default */
1916
ret = klogctl(7, NULL, 0);
1918
perror_plus("klogctl");
1921
#endif /* __linux__ */
1922
/* Lower privileges */
1924
if(take_down_interface){
1925
/* Lower privileges */
1928
perror_plus("seteuid");
1931
/* Lower privileges permanently */
1934
perror_plus("setuid");
1943
ret = init_gnutls_global(pubkey, seckey);
1945
fprintf(stderr, "init_gnutls_global failed\n");
1946
exitcode = EX_UNAVAILABLE;
1949
gnutls_initialized = true;
1956
if(mkdtemp(tempdir) == NULL){
1957
perror_plus("mkdtemp");
1960
tempdir_created = true;
1966
if(not init_gpgme(pubkey, seckey, tempdir)){
1967
fprintf(stderr, "init_gpgme failed\n");
1968
exitcode = EX_UNAVAILABLE;
1971
gpgme_initialized = true;
1978
if(connect_to != NULL){
1979
/* Connect directly, do not use Zeroconf */
1980
/* (Mainly meant for debugging) */
1981
char *address = strrchr(connect_to, ':');
1982
if(address == NULL){
1983
fprintf(stderr, "No colon in address\n");
1984
exitcode = EX_USAGE;
1994
tmpmax = strtoimax(address+1, &tmp, 10);
1995
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1996
or tmpmax != (uint16_t)tmpmax){
1997
fprintf(stderr, "Bad port number\n");
1998
exitcode = EX_USAGE;
2006
port = (uint16_t)tmpmax;
2008
/* Colon in address indicates IPv6 */
2010
if(strchr(connect_to, ':') != NULL){
2012
/* Accept [] around IPv6 address - see RFC 5952 */
2013
if(connect_to[0] == '[' and address[-1] == ']')
2021
address = connect_to;
2027
while(not quit_now){
2028
ret = start_mandos_communication(address, port, if_index, af);
2029
if(quit_now or ret == 0){
2033
fprintf(stderr, "Retrying in %d seconds\n",
2034
(int)retry_interval);
2036
sleep((int)retry_interval);
2040
exitcode = EXIT_SUCCESS;
2051
AvahiServerConfig config;
2052
/* Do not publish any local Zeroconf records */
2053
avahi_server_config_init(&config);
2054
config.publish_hinfo = 0;
2055
config.publish_addresses = 0;
2056
config.publish_workstation = 0;
2057
config.publish_domain = 0;
2059
/* Allocate a new server */
2060
mc.server = avahi_server_new(avahi_simple_poll_get
2061
(mc.simple_poll), &config, NULL,
2064
/* Free the Avahi configuration data */
2065
avahi_server_config_free(&config);
2068
/* Check if creating the Avahi server object succeeded */
2069
if(mc.server == NULL){
2070
fprintf(stderr, "Failed to create Avahi server: %s\n",
2071
avahi_strerror(error));
2072
exitcode = EX_UNAVAILABLE;
2080
/* Create the Avahi service browser */
2081
sb = avahi_s_service_browser_new(mc.server, if_index,
2082
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2083
NULL, 0, browse_callback, NULL);
2085
fprintf(stderr, "Failed to create service browser: %s\n",
2086
avahi_strerror(avahi_server_errno(mc.server)));
2087
exitcode = EX_UNAVAILABLE;
2095
/* Run the main loop */
2098
fprintf(stderr, "Starting Avahi loop search\n");
2101
ret = avahi_loop_with_timeout(mc.simple_poll,
2102
(int)(retry_interval * 1000));
2104
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
2105
(ret == 0) ? "successfully" : "with error");
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1085
/* Cleanup things */
1087
avahi_s_service_browser_free(sb);
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1126
ret = unlink(fullname);
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1136
ret = rmdir(tempdir);
2111
fprintf(stderr, "%s exiting\n", argv[0]);
2114
/* Cleanup things */
2116
avahi_s_service_browser_free(sb);
2118
if(mc.server != NULL)
2119
avahi_server_free(mc.server);
2121
if(mc.simple_poll != NULL)
2122
avahi_simple_poll_free(mc.simple_poll);
2124
if(gnutls_initialized){
2125
gnutls_certificate_free_credentials(mc.cred);
2126
gnutls_global_deinit();
2127
gnutls_dh_params_deinit(mc.dh_params);
2130
if(gpgme_initialized){
2131
gpgme_release(mc.ctx);
2134
/* Cleans up the circular linked list of Mandos servers the client
2136
if(mc.current_server != NULL){
2137
mc.current_server->prev->next = NULL;
2138
while(mc.current_server != NULL){
2139
server *next = mc.current_server->next;
2140
free(mc.current_server);
2141
mc.current_server = next;
2145
/* XXX run network hooks "stop" here */
2147
/* Take down the network interface */
2148
if(take_down_interface){
2149
/* Re-raise priviliges */
2153
perror_plus("seteuid");
2156
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2158
perror_plus("ioctl SIOCGIFFLAGS");
2159
} else if(network.ifr_flags & IFF_UP) {
2160
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2161
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2163
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2166
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2168
perror_plus("close");
2170
/* Lower privileges permanently */
2174
perror_plus("setuid");
2179
/* Removes the GPGME temp directory and all files inside */
2180
if(tempdir_created){
2181
struct dirent **direntries = NULL;
2182
struct dirent *direntry = NULL;
2183
int numentries = scandir(tempdir, &direntries, notdotentries,
2185
if (numentries > 0){
2186
for(int i = 0; i < numentries; i++){
2187
direntry = direntries[i];
2188
char *fullname = NULL;
2189
ret = asprintf(&fullname, "%s/%s", tempdir,
2192
perror_plus("asprintf");
2195
ret = remove(fullname);
2197
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2204
/* need to clean even if 0 because man page doesn't specify */
2206
if (numentries == -1){
2207
perror_plus("scandir");
2209
ret = rmdir(tempdir);
2210
if(ret == -1 and errno != ENOENT){
2211
perror_plus("rmdir");
2216
sigemptyset(&old_sigterm_action.sa_mask);
2217
old_sigterm_action.sa_handler = SIG_DFL;
2218
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2219
&old_sigterm_action,
2222
perror_plus("sigaction");
2225
ret = raise(signal_received);
2226
} while(ret != 0 and errno == EINTR);
2228
perror_plus("raise");
2231
TEMP_FAILURE_RETRY(pause());