500
640
__attribute__((unused)) const char *txt){}
502
642
/* Called when a Mandos server is found */
503
static int start_mandos_communication(const char *ip, uint16_t port,
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
504
645
AvahiIfIndex if_index,
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
646
int af, mandos_context *mc){
647
int ret, tcp_sd = -1;
649
struct sockaddr_storage to;
508
650
char *buffer = NULL;
509
char *decrypted_buffer;
651
char *decrypted_buffer = NULL;
510
652
size_t buffer_length = 0;
511
653
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
515
char interface[IF_NAMESIZE];
516
656
gnutls_session_t session;
518
ret = init_gnutls_session (mc, &session);
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
657
int pf; /* Protocol family */
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
if(if_nametoindex(interface) == (unsigned int)if_index){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
701
fprintf_plus(stderr, "Skipping server on non-used interface"
703
if_indextoname((unsigned int)if_index,
539
fprintf(stderr, "Binding to interface %s\n", interface);
711
ret = init_gnutls_session(&session, mc);
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
724
perror_plus("socket");
542
734
memset(&to, 0, sizeof(to));
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
744
perror_plus("inet_pton");
552
fprintf(stderr, "Bad address: %s\n", ip);
555
to.in6.sin6_port = htons(port); /* Spurious warning */
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
758
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
764
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
768
((struct sockaddr_in *)&to)->sin_port = htons(port);
557
to.in6.sin6_scope_id = (uint32_t)if_index;
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
567
if(strcmp(addrstr, ip) != 0){
568
fprintf(stderr, "Canonical address form: %s\n", addrstr);
777
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
778
char interface[IF_NAMESIZE];
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
perror_plus("if_indextoname");
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\n", ip, interface, (uintmax_t)port);
573
ret = connect(tcp_sd, &to.in, sizeof(to));
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
perror_plus("connect");
579
837
const char *out = mandos_protocol_version;
582
840
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
out_size - written));
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
845
perror_plus("write");
590
849
written += (size_t)ret;
591
850
if(written < out_size){
594
if (out == mandos_protocol_version){
853
if(out == mandos_protocol_version){
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
610
ret = gnutls_handshake (session);
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
888
ret = gnutls_handshake(session);
611
893
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
613
if (ret != GNUTLS_E_SUCCESS){
895
if(ret != GNUTLS_E_SUCCESS){
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
622
904
/* Read OpenPGP packet that contains the wanted password */
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
638
ret = gnutls_record_recv(session, buffer+buffer_length,
918
buffer_capacity = incbuffer(&buffer, buffer_length,
920
if(buffer_capacity == 0){
922
perror_plus("incbuffer");
932
sret = gnutls_record_recv(session, buffer+buffer_length,
645
939
case GNUTLS_E_INTERRUPTED:
646
940
case GNUTLS_E_AGAIN:
648
942
case GNUTLS_E_REHANDSHAKE:
650
ret = gnutls_handshake (session);
944
ret = gnutls_handshake(session);
651
950
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
660
fprintf(stderr, "Unknown error while reading data from"
661
" encrypted session with Mandos server\n");
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
962
gnutls_bye(session, GNUTLS_SHUT_RDWR);
667
buffer_length += (size_t) ret;
967
buffer_length += (size_t) sret;
672
fprintf(stderr, "Closing TLS session\n");
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
681
if (decrypted_buffer_size >= 0){
972
fprintf_plus(stderr, "Closing TLS session\n");
981
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
986
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
988
if(buffer_length > 0){
989
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
992
if(decrypted_buffer_size >= 0){
683
995
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
1001
ret = (int)fwrite(decrypted_buffer + written, 1,
1002
(size_t)decrypted_buffer_size - written,
687
1004
if(ret == 0 and ferror(stdout)){
689
fprintf(stderr, "Error writing encrypted data: %s\n",
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
695
1013
written += (size_t)ret;
697
free(decrypted_buffer);
705
1019
/* Shutdown procedure */
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
1024
free(decrypted_buffer);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1033
perror_plus("close");
1035
gnutls_deinit(session);
713
gnutls_deinit (session);
1045
__attribute__((nonnull))
717
1046
static void resolve_callback(AvahiSServiceResolver *r,
718
1047
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1048
AvahiProtocol proto,
720
1049
AvahiResolverEvent event,
721
1050
const char *name,
722
1051
const char *type,
805
1159
case AVAHI_BROWSER_ALL_FOR_NOW:
806
1160
case AVAHI_BROWSER_CACHE_EXHAUSTED:
808
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
fprintf_plus(stderr, "No Mandos server found, still"
1169
/* Signal handler that stops main loop after SIGTERM */
1170
static void handle_sigterm(int sig){
1175
signal_received = sig;
1176
int old_errno = errno;
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1192
perror_plus("socket");
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1201
perror_plus("ioctl SIOCGIFFLAGS");
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1245
/* Accept this device */
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1264
if(not get_flags(if_entry->d_name, &ifr)){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1272
if(not good_flags(if_entry->d_name, &ifr)){
1279
* This function determines if a network interface is up.
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1284
if(not get_flags(interface, &ifr)){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1296
* This function determines if a network interface is running
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1301
if(not get_flags(interface, &ifr)){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1331
if((direntry->d_name)[0] == '\0'){
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1349
char *fullname = NULL;
1350
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1352
perror_plus("asprintf");
1356
ret = stat(fullname, &st);
1359
perror_plus("Could not stat hook");
1364
if(not (S_ISREG(st.st_mode))){
1365
/* Not a regular file */
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1372
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1373
/* Not executable */
1375
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1381
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1387
__attribute__((nonnull, warn_unused_result))
1388
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1389
mandos_context *mc){
1391
struct timespec now;
1392
struct timespec waited_time;
1393
intmax_t block_time;
1396
if(mc->current_server == NULL){
1398
fprintf_plus(stderr, "Wait until first server is found."
1401
ret = avahi_simple_poll_iterate(s, -1);
1404
fprintf_plus(stderr, "Check current_server if we should run"
1407
/* the current time */
1408
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1410
perror_plus("clock_gettime");
1413
/* Calculating in ms how long time between now and server
1414
who we visted longest time ago. Now - last seen. */
1415
waited_time.tv_sec = (now.tv_sec
1416
- mc->current_server->last_seen.tv_sec);
1417
waited_time.tv_nsec = (now.tv_nsec
1418
- mc->current_server->last_seen.tv_nsec);
1419
/* total time is 10s/10,000ms.
1420
Converting to s from ms by dividing by 1,000,
1421
and ns to ms by dividing by 1,000,000. */
1422
block_time = ((retry_interval
1423
- ((intmax_t)waited_time.tv_sec * 1000))
1424
- ((intmax_t)waited_time.tv_nsec / 1000000));
1427
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1431
if(block_time <= 0){
1432
ret = start_mandos_communication(mc->current_server->ip,
1433
mc->current_server->port,
1434
mc->current_server->if_index,
1435
mc->current_server->af, mc);
1437
avahi_simple_poll_quit(s);
1440
ret = clock_gettime(CLOCK_MONOTONIC,
1441
&mc->current_server->last_seen);
1443
perror_plus("clock_gettime");
1446
mc->current_server = mc->current_server->next;
1447
block_time = 0; /* Call avahi to find new Mandos
1448
servers, but don't block */
1451
ret = avahi_simple_poll_iterate(s, (int)block_time);
1454
if(ret > 0 or errno != EINTR){
1455
return (ret != 1) ? ret : 0;
1461
/* Set effective uid to 0, return errno */
1462
__attribute__((warn_unused_result))
1463
error_t raise_privileges(void){
1464
error_t old_errno = errno;
1465
error_t ret_errno = 0;
1466
if(seteuid(0) == -1){
1468
perror_plus("seteuid");
1474
/* Set effective and real user ID to 0. Return errno. */
1475
__attribute__((warn_unused_result))
1476
error_t raise_privileges_permanently(void){
1477
error_t old_errno = errno;
1478
error_t ret_errno = raise_privileges();
1483
if(setuid(0) == -1){
1485
perror_plus("seteuid");
1491
/* Set effective user ID to unprivileged saved user ID */
1492
__attribute__((warn_unused_result))
1493
error_t lower_privileges(void){
1494
error_t old_errno = errno;
1495
error_t ret_errno = 0;
1496
if(seteuid(uid) == -1){
1498
perror_plus("seteuid");
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1511
perror_plus("setuid");
1519
* Based on the example in the GNU LibC manual chapter 13.13 "File
1520
* Descriptor Flags".
1521
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1523
__attribute__((warn_unused_result))
1524
static int set_cloexec_flag(int fd){
1525
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1526
/* If reading the flags failed, return error indication now. */
1530
/* Store modified flag word in the descriptor. */
1531
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1534
#endif /* not O_CLOEXEC */
1536
__attribute__((nonnull))
1537
void run_network_hooks(const char *mode, const char *interface,
1539
struct dirent **direntries;
1540
if(hookdir_fd == -1){
1541
hookdir_fd = open(hookdir, O_RDONLY |
1544
#else /* not O_CLOEXEC */
1546
#endif /* not O_CLOEXEC */
1548
if(hookdir_fd == -1){
1549
if(errno == ENOENT){
1551
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1552
" found\n", hookdir);
1555
perror_plus("open");
1560
if(set_cloexec_flag(hookdir_fd) < 0){
1561
perror_plus("set_cloexec_flag");
1562
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1563
perror_plus("close");
1569
#endif /* not O_CLOEXEC */
1572
#if __GLIBC_PREREQ(2, 15)
1573
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1574
runnable_hook, alphasort);
1575
#else /* not __GLIBC_PREREQ(2, 15) */
1576
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1578
#endif /* not __GLIBC_PREREQ(2, 15) */
1579
#else /* not __GLIBC__ */
1580
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1582
#endif /* not __GLIBC__ */
1584
perror_plus("scandir");
1587
struct dirent *direntry;
1589
int devnull = open("/dev/null", O_RDONLY);
1590
for(int i = 0; i < numhooks; i++){
1591
direntry = direntries[i];
1593
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1596
pid_t hook_pid = fork();
1599
/* Raise privileges */
1600
if(raise_privileges_permanently() != 0){
1601
perror_plus("Failed to raise privileges");
1608
perror_plus("setgid");
1611
/* Reset supplementary groups */
1613
ret = setgroups(0, NULL);
1615
perror_plus("setgroups");
1618
ret = dup2(devnull, STDIN_FILENO);
1620
perror_plus("dup2(devnull, STDIN_FILENO)");
1623
ret = close(devnull);
1625
perror_plus("close");
1628
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1630
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1633
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1635
perror_plus("setenv");
1638
ret = setenv("DEVICE", interface, 1);
1640
perror_plus("setenv");
1643
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1645
perror_plus("setenv");
1648
ret = setenv("MODE", mode, 1);
1650
perror_plus("setenv");
1654
ret = asprintf(&delaystring, "%f", (double)delay);
1656
perror_plus("asprintf");
1659
ret = setenv("DELAY", delaystring, 1);
1662
perror_plus("setenv");
1666
if(connect_to != NULL){
1667
ret = setenv("CONNECT", connect_to, 1);
1669
perror_plus("setenv");
1673
if(fexecve(hookdir_fd, (char *const [])
1674
{ direntry->d_name, NULL }, environ) == -1){
1675
perror_plus("fexecve");
1676
_exit(EXIT_FAILURE);
1680
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1681
perror_plus("waitpid");
1684
if(WIFEXITED(status)){
1685
if(WEXITSTATUS(status) != 0){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1687
" with status %d\n", direntry->d_name,
1688
WEXITSTATUS(status));
1691
} else if(WIFSIGNALED(status)){
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1693
" signal %d\n", direntry->d_name,
1697
fprintf_plus(stderr, "Warning: network hook \"%s\""
1698
" crashed\n", direntry->d_name);
1703
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1707
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1708
perror_plus("close");
1715
__attribute__((nonnull, warn_unused_result))
1716
error_t bring_up_interface(const char *const interface,
1718
error_t old_errno = errno;
1720
struct ifreq network;
1721
unsigned int if_index = if_nametoindex(interface);
1723
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1733
if(not interface_is_up(interface)){
1734
error_t ret_errno = 0, ioctl_errno = 0;
1735
if(not get_flags(interface, &network)){
1737
fprintf_plus(stderr, "Failed to get flags for interface "
1738
"\"%s\"\n", interface);
1742
network.ifr_flags |= IFF_UP; /* set flag */
1744
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1747
perror_plus("socket");
1753
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1755
perror_plus("close");
1762
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1766
/* Raise privileges */
1767
ret_errno = raise_privileges();
1769
perror_plus("Failed to raise privileges");
1774
bool restore_loglevel = false;
1776
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1777
messages about the network interface to mess up the prompt */
1778
ret_linux = klogctl(8, NULL, 5);
1779
if(ret_linux == -1){
1780
perror_plus("klogctl");
1782
restore_loglevel = true;
1785
#endif /* __linux__ */
1786
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1787
ioctl_errno = errno;
1789
if(restore_loglevel){
1790
ret_linux = klogctl(7, NULL, 0);
1791
if(ret_linux == -1){
1792
perror_plus("klogctl");
1795
#endif /* __linux__ */
1797
/* If raise_privileges() succeeded above */
1799
/* Lower privileges */
1800
ret_errno = lower_privileges();
1803
perror_plus("Failed to lower privileges");
1807
/* Close the socket */
1808
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1810
perror_plus("close");
1813
if(ret_setflags == -1){
1814
errno = ioctl_errno;
1815
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1820
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1824
/* Sleep checking until interface is running.
1825
Check every 0.25s, up to total time of delay */
1826
for(int i=0; i < delay * 4; i++){
1827
if(interface_is_running(interface)){
1830
struct timespec sleeptime = { .tv_nsec = 250000000 };
1831
ret = nanosleep(&sleeptime, NULL);
1832
if(ret == -1 and errno != EINTR){
1833
perror_plus("nanosleep");
1841
__attribute__((nonnull, warn_unused_result))
1842
error_t take_down_interface(const char *const interface){
1843
error_t old_errno = errno;
1844
struct ifreq network;
1845
unsigned int if_index = if_nametoindex(interface);
1847
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1851
if(interface_is_up(interface)){
1852
error_t ret_errno = 0, ioctl_errno = 0;
1853
if(not get_flags(interface, &network) and debug){
1855
fprintf_plus(stderr, "Failed to get flags for interface "
1856
"\"%s\"\n", interface);
1860
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1862
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1865
perror_plus("socket");
1871
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1875
/* Raise privileges */
1876
ret_errno = raise_privileges();
1878
perror_plus("Failed to raise privileges");
1881
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1882
ioctl_errno = errno;
1884
/* If raise_privileges() succeeded above */
1886
/* Lower privileges */
1887
ret_errno = lower_privileges();
1890
perror_plus("Failed to lower privileges");
1894
/* Close the socket */
1895
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1897
perror_plus("close");
1900
if(ret_setflags == -1){
1901
errno = ioctl_errno;
1902
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1907
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
814
1915
int main(int argc, char *argv[]){
815
AvahiSServiceBrowser *sb = NULL;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
844
{ .name = "interface", .key = 'i',
846
.doc = "Interface that will be used to search for Mandos"
849
{ .name = "seckey", .key = 's',
851
.doc = "OpenPGP secret key file base name",
853
{ .name = "pubkey", .key = 'p',
855
.doc = "OpenPGP public key file base name",
857
{ .name = "dh-bits", .key = 129,
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
862
{ .name = "priority", .key = 130,
864
.doc = "GnuTLS priority string for the TLS handshake",
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
874
case 128: /* --debug */
877
case 'c': /* --connect */
880
case 'i': /* --interface */
883
case 's': /* --seckey */
886
case 'p': /* --pubkey */
889
case 129: /* --dh-bits */
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
897
case 130: /* --priority */
905
return ARGP_ERR_UNKNOWN;
910
struct argp argp = { .options = options, .parser = parse_opt,
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
922
ret = init_gnutls_global(&mc, pubkey, seckey);
924
fprintf(stderr, "init_gnutls_global failed\n");
925
exitcode = EXIT_FAILURE;
928
gnutls_initalized = true;
931
if(mkdtemp(tempdir) == NULL){
937
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
938
fprintf(stderr, "gpgme_initalized failed\n");
939
exitcode = EXIT_FAILURE;
942
gpgme_initalized = true;
945
/* If the interface is down, bring it up */
947
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
950
exitcode = EXIT_FAILURE;
953
strcpy(network.ifr_name, interface);
954
ret = ioctl(sd, SIOCGIFFLAGS, &network);
956
perror("ioctl SIOCGIFFLAGS");
957
exitcode = EXIT_FAILURE;
960
if((network.ifr_flags & IFF_UP) == 0){
961
network.ifr_flags |= IFF_UP;
962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
964
perror("ioctl SIOCSIFFLAGS");
965
exitcode = EXIT_FAILURE;
969
ret = TEMP_FAILURE_RETRY(close(sd));
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1916
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1917
.priority = "SECURE256:!CTYPE-X.509:"
1918
"+CTYPE-OPENPGP", .current_server = NULL,
1919
.interfaces = NULL, .interfaces_size = 0 };
1920
AvahiSServiceBrowser *sb = NULL;
1925
int exitcode = EXIT_SUCCESS;
1926
char *interfaces_to_take_down = NULL;
1927
size_t interfaces_to_take_down_size = 0;
1928
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1929
char old_tempdir[] = "/tmp/mandosXXXXXX";
1930
char *tempdir = NULL;
1931
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1932
const char *seckey = PATHDIR "/" SECKEY;
1933
const char *pubkey = PATHDIR "/" PUBKEY;
1934
char *interfaces_hooks = NULL;
1936
bool gnutls_initialized = false;
1937
bool gpgme_initialized = false;
1939
double retry_interval = 10; /* 10s between trying a server and
1940
retrying the same server again */
1942
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1943
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1948
/* Lower any group privileges we might have, just to be safe */
1952
perror_plus("setgid");
1955
/* Lower user privileges (temporarily) */
1959
perror_plus("seteuid");
1967
struct argp_option options[] = {
1968
{ .name = "debug", .key = 128,
1969
.doc = "Debug mode", .group = 3 },
1970
{ .name = "connect", .key = 'c',
1971
.arg = "ADDRESS:PORT",
1972
.doc = "Connect directly to a specific Mandos server",
1974
{ .name = "interface", .key = 'i',
1976
.doc = "Network interface that will be used to search for"
1979
{ .name = "seckey", .key = 's',
1981
.doc = "OpenPGP secret key file base name",
1983
{ .name = "pubkey", .key = 'p',
1985
.doc = "OpenPGP public key file base name",
1987
{ .name = "dh-bits", .key = 129,
1989
.doc = "Bit length of the prime number used in the"
1990
" Diffie-Hellman key exchange",
1992
{ .name = "priority", .key = 130,
1994
.doc = "GnuTLS priority string for the TLS handshake",
1996
{ .name = "delay", .key = 131,
1998
.doc = "Maximum delay to wait for interface startup",
2000
{ .name = "retry", .key = 132,
2002
.doc = "Retry interval used when denied by the Mandos server",
2004
{ .name = "network-hook-dir", .key = 133,
2006
.doc = "Directory where network hooks are located",
2009
* These reproduce what we would get without ARGP_NO_HELP
2011
{ .name = "help", .key = '?',
2012
.doc = "Give this help list", .group = -1 },
2013
{ .name = "usage", .key = -3,
2014
.doc = "Give a short usage message", .group = -1 },
2015
{ .name = "version", .key = 'V',
2016
.doc = "Print program version", .group = -1 },
2020
error_t parse_opt(int key, char *arg,
2021
struct argp_state *state){
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
2024
case 128: /* --debug */
2027
case 'c': /* --connect */
2030
case 'i': /* --interface */
2031
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2034
argp_error(state, "%s", strerror(ret_errno));
2037
case 's': /* --seckey */
2040
case 'p': /* --pubkey */
2043
case 129: /* --dh-bits */
2045
tmpmax = strtoimax(arg, &tmp, 10);
2046
if(errno != 0 or tmp == arg or *tmp != '\0'
2047
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2048
argp_error(state, "Bad number of DH bits");
2050
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2052
case 130: /* --priority */
2055
case 131: /* --delay */
2057
delay = strtof(arg, &tmp);
2058
if(errno != 0 or tmp == arg or *tmp != '\0'){
2059
argp_error(state, "Bad delay");
2061
case 132: /* --retry */
2063
retry_interval = strtod(arg, &tmp);
2064
if(errno != 0 or tmp == arg or *tmp != '\0'
2065
or (retry_interval * 1000) > INT_MAX
2066
or retry_interval < 0){
2067
argp_error(state, "Bad retry interval");
2070
case 133: /* --network-hook-dir */
2074
* These reproduce what we would get without ARGP_NO_HELP
2076
case '?': /* --help */
2077
argp_state_help(state, state->out_stream,
2078
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2079
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2080
case -3: /* --usage */
2081
argp_state_help(state, state->out_stream,
2082
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2083
case 'V': /* --version */
2084
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2085
exit(argp_err_exit_status);
2088
return ARGP_ERR_UNKNOWN;
2093
struct argp argp = { .options = options, .parser = parse_opt,
2095
.doc = "Mandos client -- Get and decrypt"
2096
" passwords from a Mandos server" };
2097
ret = argp_parse(&argp, argc, argv,
2098
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2105
perror_plus("argp_parse");
2106
exitcode = EX_OSERR;
2109
exitcode = EX_USAGE;
2115
/* Work around Debian bug #633582:
2116
<http://bugs.debian.org/633582> */
2118
/* Re-raise privileges */
2119
ret_errno = raise_privileges();
2122
perror_plus("Failed to raise privileges");
2126
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2127
int seckey_fd = open(seckey, O_RDONLY);
2128
if(seckey_fd == -1){
2129
perror_plus("open");
2131
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2133
perror_plus("fstat");
2135
if(S_ISREG(st.st_mode)
2136
and st.st_uid == 0 and st.st_gid == 0){
2137
ret = fchown(seckey_fd, uid, gid);
2139
perror_plus("fchown");
2143
TEMP_FAILURE_RETRY(close(seckey_fd));
2147
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2148
int pubkey_fd = open(pubkey, O_RDONLY);
2149
if(pubkey_fd == -1){
2150
perror_plus("open");
2152
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2154
perror_plus("fstat");
2156
if(S_ISREG(st.st_mode)
2157
and st.st_uid == 0 and st.st_gid == 0){
2158
ret = fchown(pubkey_fd, uid, gid);
2160
perror_plus("fchown");
2164
TEMP_FAILURE_RETRY(close(pubkey_fd));
2168
/* Lower privileges */
2169
ret_errno = lower_privileges();
2172
perror_plus("Failed to lower privileges");
2177
/* Remove invalid interface names (except "none") */
2179
char *interface = NULL;
2180
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2182
if(strcmp(interface, "none") != 0
2183
and if_nametoindex(interface) == 0){
2184
if(interface[0] != '\0'){
2185
fprintf_plus(stderr, "Not using nonexisting interface"
2186
" \"%s\"\n", interface);
2188
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2194
/* Run network hooks */
2196
if(mc.interfaces != NULL){
2197
interfaces_hooks = malloc(mc.interfaces_size);
2198
if(interfaces_hooks == NULL){
2199
perror_plus("malloc");
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1014
exitcode = EXIT_FAILURE;
1016
exitcode = EXIT_SUCCESS;
1022
avahi_set_log_function(empty_log);
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1033
exitcode = EXIT_FAILURE;
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1075
/* Run the main loop */
1078
fprintf(stderr, "Starting Avahi loop search\n");
1081
avahi_simple_poll_loop(mc.simple_poll);
2202
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2203
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2205
run_network_hooks("start", interfaces_hooks != NULL ?
2206
interfaces_hooks : "", delay);
2210
avahi_set_log_function(empty_log);
2213
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2214
from the signal handler */
2215
/* Initialize the pseudo-RNG for Avahi */
2216
srand((unsigned int) time(NULL));
2217
simple_poll = avahi_simple_poll_new();
2218
if(simple_poll == NULL){
2219
fprintf_plus(stderr,
2220
"Avahi: Failed to create simple poll object.\n");
2221
exitcode = EX_UNAVAILABLE;
2225
sigemptyset(&sigterm_action.sa_mask);
2226
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2228
perror_plus("sigaddset");
2229
exitcode = EX_OSERR;
2232
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2234
perror_plus("sigaddset");
2235
exitcode = EX_OSERR;
2238
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2240
perror_plus("sigaddset");
2241
exitcode = EX_OSERR;
2244
/* Need to check if the handler is SIG_IGN before handling:
2245
| [[info:libc:Initial Signal Actions]] |
2246
| [[info:libc:Basic Signal Handling]] |
2248
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2250
perror_plus("sigaction");
2253
if(old_sigterm_action.sa_handler != SIG_IGN){
2254
ret = sigaction(SIGINT, &sigterm_action, NULL);
2256
perror_plus("sigaction");
2257
exitcode = EX_OSERR;
2261
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2263
perror_plus("sigaction");
2266
if(old_sigterm_action.sa_handler != SIG_IGN){
2267
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2269
perror_plus("sigaction");
2270
exitcode = EX_OSERR;
2274
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2276
perror_plus("sigaction");
2279
if(old_sigterm_action.sa_handler != SIG_IGN){
2280
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2282
perror_plus("sigaction");
2283
exitcode = EX_OSERR;
2288
/* If no interfaces were specified, make a list */
2289
if(mc.interfaces == NULL){
2290
struct dirent **direntries;
2291
/* Look for any good interfaces */
2292
ret = scandir(sys_class_net, &direntries, good_interface,
2295
/* Add all found interfaces to interfaces list */
2296
for(int i = 0; i < ret; ++i){
2297
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2298
direntries[i]->d_name);
2301
perror_plus("argz_add");
2305
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2306
direntries[i]->d_name);
2312
fprintf_plus(stderr, "Could not find a network interface\n");
2313
exitcode = EXIT_FAILURE;
2318
/* Bring up interfaces which are down, and remove any "none"s */
2320
char *interface = NULL;
2321
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2323
/* If interface name is "none", stop bringing up interfaces.
2324
Also remove all instances of "none" from the list */
2325
if(strcmp(interface, "none") == 0){
2326
argz_delete(&mc.interfaces, &mc.interfaces_size,
2329
while((interface = argz_next(mc.interfaces,
2330
mc.interfaces_size, interface))){
2331
if(strcmp(interface, "none") == 0){
2332
argz_delete(&mc.interfaces, &mc.interfaces_size,
2339
bool interface_was_up = interface_is_up(interface);
2340
errno = bring_up_interface(interface, delay);
2341
if(not interface_was_up){
2343
perror_plus("Failed to bring up interface");
2345
errno = argz_add(&interfaces_to_take_down,
2346
&interfaces_to_take_down_size,
2349
perror_plus("argz_add");
2354
if(debug and (interfaces_to_take_down == NULL)){
2355
fprintf_plus(stderr, "No interfaces were brought up\n");
2359
/* If we only got one interface, explicitly use only that one */
2360
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2362
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2365
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2372
ret = init_gnutls_global(pubkey, seckey, &mc);
2374
fprintf_plus(stderr, "init_gnutls_global failed\n");
2375
exitcode = EX_UNAVAILABLE;
2378
gnutls_initialized = true;
2385
/* Try /run/tmp before /tmp */
2386
tempdir = mkdtemp(run_tempdir);
2387
if(tempdir == NULL and errno == ENOENT){
2389
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2390
run_tempdir, old_tempdir);
2392
tempdir = mkdtemp(old_tempdir);
2394
if(tempdir == NULL){
2395
perror_plus("mkdtemp");
2403
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2404
fprintf_plus(stderr, "init_gpgme failed\n");
2405
exitcode = EX_UNAVAILABLE;
2408
gpgme_initialized = true;
2415
if(connect_to != NULL){
2416
/* Connect directly, do not use Zeroconf */
2417
/* (Mainly meant for debugging) */
2418
char *address = strrchr(connect_to, ':');
2420
if(address == NULL){
2421
fprintf_plus(stderr, "No colon in address\n");
2422
exitcode = EX_USAGE;
2432
tmpmax = strtoimax(address+1, &tmp, 10);
2433
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2434
or tmpmax != (in_port_t)tmpmax){
2435
fprintf_plus(stderr, "Bad port number\n");
2436
exitcode = EX_USAGE;
2444
port = (in_port_t)tmpmax;
2446
/* Colon in address indicates IPv6 */
2448
if(strchr(connect_to, ':') != NULL){
2450
/* Accept [] around IPv6 address - see RFC 5952 */
2451
if(connect_to[0] == '[' and address[-1] == ']')
2459
address = connect_to;
2465
while(not quit_now){
2466
ret = start_mandos_communication(address, port, if_index, af,
2468
if(quit_now or ret == 0){
2472
fprintf_plus(stderr, "Retrying in %d seconds\n",
2473
(int)retry_interval);
2475
sleep((unsigned int)retry_interval);
2479
exitcode = EXIT_SUCCESS;
2490
AvahiServerConfig config;
2491
/* Do not publish any local Zeroconf records */
2492
avahi_server_config_init(&config);
2493
config.publish_hinfo = 0;
2494
config.publish_addresses = 0;
2495
config.publish_workstation = 0;
2496
config.publish_domain = 0;
2498
/* Allocate a new server */
2499
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2500
&config, NULL, NULL, &ret_errno);
2502
/* Free the Avahi configuration data */
2503
avahi_server_config_free(&config);
2506
/* Check if creating the Avahi server object succeeded */
2507
if(mc.server == NULL){
2508
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2509
avahi_strerror(ret_errno));
2510
exitcode = EX_UNAVAILABLE;
2518
/* Create the Avahi service browser */
2519
sb = avahi_s_service_browser_new(mc.server, if_index,
2520
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2521
NULL, 0, browse_callback,
2524
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2525
avahi_strerror(avahi_server_errno(mc.server)));
2526
exitcode = EX_UNAVAILABLE;
2534
/* Run the main loop */
2537
fprintf_plus(stderr, "Starting Avahi loop search\n");
2540
ret = avahi_loop_with_timeout(simple_poll,
2541
(int)(retry_interval * 1000), &mc);
2543
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2544
(ret == 0) ? "successfully" : "with error");
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1089
/* Cleanup things */
1091
avahi_s_service_browser_free(sb);
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1130
ret = unlink(fullname);
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1140
ret = rmdir(tempdir);
2550
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2553
/* Cleanup things */
2554
free(mc.interfaces);
2557
avahi_s_service_browser_free(sb);
2559
if(mc.server != NULL)
2560
avahi_server_free(mc.server);
2562
if(simple_poll != NULL)
2563
avahi_simple_poll_free(simple_poll);
2565
if(gnutls_initialized){
2566
gnutls_certificate_free_credentials(mc.cred);
2567
gnutls_global_deinit();
2568
gnutls_dh_params_deinit(mc.dh_params);
2571
if(gpgme_initialized){
2572
gpgme_release(mc.ctx);
2575
/* Cleans up the circular linked list of Mandos servers the client
2577
if(mc.current_server != NULL){
2578
mc.current_server->prev->next = NULL;
2579
while(mc.current_server != NULL){
2580
server *next = mc.current_server->next;
2581
free(mc.current_server);
2582
mc.current_server = next;
2586
/* Re-raise privileges */
2588
ret_errno = raise_privileges();
2590
perror_plus("Failed to raise privileges");
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2597
/* Take down the network interfaces which were brought up */
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2603
ret_errno = take_down_interface(interface);
2606
perror_plus("Failed to take down interface");
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
2616
ret_errno = lower_privileges_permanently();
2618
perror_plus("Failed to lower privileges permanently");
2622
free(interfaces_to_take_down);
2623
free(interfaces_hooks);
2625
/* Removes the GPGME temp directory and all files inside */
2626
if(tempdir != NULL){
2627
struct dirent **direntries = NULL;
2628
struct dirent *direntry = NULL;
2629
int numentries = scandir(tempdir, &direntries, notdotentries,
2632
for(int i = 0; i < numentries; i++){
2633
direntry = direntries[i];
2634
char *fullname = NULL;
2635
ret = asprintf(&fullname, "%s/%s", tempdir,
2638
perror_plus("asprintf");
2641
ret = remove(fullname);
2643
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2650
/* need to clean even if 0 because man page doesn't specify */
2652
if(numentries == -1){
2653
perror_plus("scandir");
2655
ret = rmdir(tempdir);
2656
if(ret == -1 and errno != ENOENT){
2657
perror_plus("rmdir");
2662
sigemptyset(&old_sigterm_action.sa_mask);
2663
old_sigterm_action.sa_handler = SIG_DFL;
2664
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2665
&old_sigterm_action,
2668
perror_plus("sigaction");
2671
ret = raise(signal_received);
2672
} while(ret != 0 and errno == EINTR);
2674
perror_plus("raise");
2677
TEMP_FAILURE_RETRY(pause());