650
613
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
614
__attribute__((unused)) const char *txt){}
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
709
AvahiIfIndex if_index){
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char remove_arg[] = "remove";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
747
perror_plus("setgid");
750
/* Reset supplementary groups */
752
ret = setgroups(0, NULL);
754
perror_plus("setgroups");
758
ret = dup2(devnull, STDIN_FILENO);
760
perror_plus("dup2(devnull, STDIN_FILENO)");
763
ret = close(devnull);
765
perror_plus("close");
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
778
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
780
TEMP_FAILURE_RETRY(close(helperdir_fd));
782
#pragma GCC diagnostic push
783
#pragma GCC diagnostic ignored "-Wcast-qual"
785
if(fexecve(helper_fd, (char *const [])
786
{ helper, add ? add_arg : remove_arg, (char *)address,
787
interface, NULL }, environ) == -1){
789
#pragma GCC diagnostic pop
791
perror_plus("fexecve");
803
pret = waitpid(pid, &status, 0);
804
if(pret == -1 and errno == EINTR and quit_now){
805
int errno_raising = 0;
806
if((errno = raise_privileges()) != 0){
807
errno_raising = errno;
808
perror_plus("Failed to raise privileges in order to"
809
" kill helper program");
811
if(kill(pid, SIGTERM) == -1){
814
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
815
perror_plus("Failed to lower privileges after killing"
820
} while(pret == -1 and errno == EINTR);
822
perror_plus("waitpid");
825
if(WIFEXITED(status)){
826
if(WEXITSTATUS(status) != 0){
827
fprintf_plus(stderr, "Error: iprouteadddel exited"
828
" with status %d\n", WEXITSTATUS(status));
833
if(WIFSIGNALED(status)){
834
fprintf_plus(stderr, "Error: iprouteadddel died by"
835
" signal %d\n", WTERMSIG(status));
838
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
842
__attribute__((nonnull, warn_unused_result))
843
static bool add_local_route(const char *address,
844
AvahiIfIndex if_index){
845
return add_remove_local_route(true, address, if_index);
848
__attribute__((nonnull, warn_unused_result))
849
static bool remove_local_route(const char *address,
850
AvahiIfIndex if_index){
851
return add_remove_local_route(false, address, if_index);
854
616
/* Called when a Mandos server is found */
855
__attribute__((nonnull, warn_unused_result))
856
static int start_mandos_communication(const char *ip, in_port_t port,
617
static int start_mandos_communication(const char *ip, uint16_t port,
857
618
AvahiIfIndex if_index,
858
int af, mandos_context *mc){
859
620
int ret, tcp_sd = -1;
861
struct sockaddr_storage to;
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
862
626
char *buffer = NULL;
863
627
char *decrypted_buffer = NULL;
864
628
size_t buffer_length = 0;
992
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
993
730
perror_plus("if_indextoname");
995
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
996
"\n", ip, interface, (uintmax_t)port);
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
999
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1000
ip, (uintmax_t)port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1002
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1003
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1005
ret = getnameinfo((struct sockaddr *)&to,
1006
sizeof(struct sockaddr_in6),
1007
addrstr, sizeof(addrstr), NULL, 0,
1010
ret = getnameinfo((struct sockaddr *)&to,
1011
sizeof(struct sockaddr_in),
1012
addrstr, sizeof(addrstr), NULL, 0,
1015
if(ret == EAI_SYSTEM){
1016
perror_plus("getnameinfo");
1017
} else if(ret != 0) {
1018
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1019
} else if(strcmp(addrstr, ip) != 0){
1020
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1031
ret = connect(tcp_sd, (struct sockaddr *)&to,
1032
sizeof(struct sockaddr_in6));
1034
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1035
sizeof(struct sockaddr_in));
1038
if(errno == ENETUNREACH
1039
and if_index != AVAHI_IF_UNSPEC
1040
and connect_to == NULL
1041
and not route_added and
1042
((af == AF_INET6 and not
1043
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1045
or (af == AF_INET and
1046
/* Not a a IPv4LL address */
1047
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1048
& 0xFFFF0000L) != 0xA9FE0000L))){
1049
/* Work around Avahi bug - Avahi does not announce link-local
1050
addresses if it has a global address, so local hosts with
1051
*only* a link-local address (e.g. Mandos clients) cannot
1052
connect to a Mandos server announced by Avahi on a server
1053
host with a global address. Work around this by retrying
1054
with an explicit route added with the server's address.
1056
Avahi bug reference:
1057
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1058
https://bugs.debian.org/587961
1061
route_added = add_local_route(ip, if_index);
1067
if(errno != ECONNREFUSED or debug){
1069
perror_plus("connect");
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
perror_plus("inet_ntop");
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
perror_plus("connect");
1082
782
const char *out = mandos_protocol_version;
1695
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1698
if(ret > 0 or errno != EINTR){
1377
if (ret > 0 or errno != EINTR){
1699
1378
return (ret != 1) ? ret : 0;
1705
__attribute__((nonnull))
1706
void run_network_hooks(const char *mode, const char *interface,
1384
bool run_network_hooks(const char *mode, const char *interface,
1707
1385
const float delay){
1708
struct dirent **direntries = NULL;
1709
if(hookdir_fd == -1){
1710
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1712
if(hookdir_fd == -1){
1713
if(errno == ENOENT){
1715
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1716
" found\n", hookdir);
1719
perror_plus("open");
1725
#if __GLIBC_PREREQ(2, 15)
1726
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1727
runnable_hook, alphasort);
1728
#else /* not __GLIBC_PREREQ(2, 15) */
1729
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1731
#endif /* not __GLIBC_PREREQ(2, 15) */
1732
#else /* not __GLIBC__ */
1733
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1735
#endif /* not __GLIBC__ */
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1736
1391
if(numhooks == -1){
1737
1392
perror_plus("scandir");
1740
struct dirent *direntry;
1742
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1744
perror_plus("open(\"/dev/null\", O_RDONLY)");
1747
for(int i = 0; i < numhooks; i++){
1748
direntry = direntries[i];
1750
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1753
pid_t hook_pid = fork();
1756
/* Raise privileges */
1757
errno = raise_privileges_permanently();
1759
perror_plus("Failed to raise privileges");
1766
perror_plus("setgid");
1769
/* Reset supplementary groups */
1771
ret = setgroups(0, NULL);
1773
perror_plus("setgroups");
1776
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1778
perror_plus("setenv");
1781
ret = setenv("DEVICE", interface, 1);
1783
perror_plus("setenv");
1786
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1788
perror_plus("setenv");
1791
ret = setenv("MODE", mode, 1);
1793
perror_plus("setenv");
1797
ret = asprintf(&delaystring, "%f", (double)delay);
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1799
1400
perror_plus("asprintf");
1802
ret = setenv("DELAY", delaystring, 1);
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1407
pid_t hook_pid = fork();
1410
/* Raise privileges */
1414
perror_plus("seteuid");
1416
/* Raise privileges even more */
1420
perror_plus("setuid");
1426
perror_plus("setgid");
1428
/* Reset supplementary groups */
1430
ret = setgroups(0, NULL);
1432
perror_plus("setgroups");
1434
dup2(devnull, STDIN_FILENO);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
perror_plus("setenv");
1442
ret = setenv("DEVICE", interface, 1);
1444
perror_plus("setenv");
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1449
perror_plus("setenv");
1452
ret = setenv("MODE", mode, 1);
1454
perror_plus("setenv");
1458
ret = asprintf(&delaystring, "%f", delay);
1460
perror_plus("asprintf");
1463
ret = setenv("DELAY", delaystring, 1);
1466
perror_plus("setenv");
1804
1469
free(delaystring);
1805
perror_plus("setenv");
1809
if(connect_to != NULL){
1810
ret = setenv("CONNECT", connect_to, 1);
1812
perror_plus("setenv");
1816
int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,
1820
perror_plus("openat");
1821
_exit(EXIT_FAILURE);
1823
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1824
perror_plus("close");
1825
_exit(EXIT_FAILURE);
1827
ret = dup2(devnull, STDIN_FILENO);
1829
perror_plus("dup2(devnull, STDIN_FILENO)");
1832
ret = close(devnull);
1834
perror_plus("close");
1837
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1839
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1842
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1844
perror_plus("fexecve");
1845
_exit(EXIT_FAILURE);
1849
perror_plus("fork");
1854
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1855
perror_plus("waitpid");
1859
if(WIFEXITED(status)){
1860
if(WEXITSTATUS(status) != 0){
1861
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1862
" with status %d\n", direntry->d_name,
1863
WEXITSTATUS(status));
1867
} else if(WIFSIGNALED(status)){
1868
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1869
" signal %d\n", direntry->d_name,
1874
fprintf_plus(stderr, "Warning: network hook \"%s\""
1875
" crashed\n", direntry->d_name);
1881
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1887
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1888
perror_plus("close");
1895
__attribute__((nonnull, warn_unused_result))
1896
error_t bring_up_interface(const char *const interface,
1898
error_t old_errno = errno;
1900
struct ifreq network;
1901
unsigned int if_index = if_nametoindex(interface);
1903
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1913
if(not interface_is_up(interface)){
1914
error_t ret_errno = 0, ioctl_errno = 0;
1915
if(not get_flags(interface, &network)){
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1922
network.ifr_flags |= IFF_UP; /* set flag */
1924
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1927
perror_plus("socket");
1933
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1935
perror_plus("close");
1942
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1946
/* Raise privileges */
1947
ret_errno = raise_privileges();
1950
perror_plus("Failed to raise privileges");
1955
bool restore_loglevel = false;
1957
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1958
messages about the network interface to mess up the prompt */
1959
ret_linux = klogctl(8, NULL, 5);
1960
if(ret_linux == -1){
1961
perror_plus("klogctl");
1963
restore_loglevel = true;
1966
#endif /* __linux__ */
1967
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1968
ioctl_errno = errno;
1970
if(restore_loglevel){
1971
ret_linux = klogctl(7, NULL, 0);
1972
if(ret_linux == -1){
1973
perror_plus("klogctl");
1976
#endif /* __linux__ */
1978
/* If raise_privileges() succeeded above */
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1984
perror_plus("Failed to lower privileges");
1988
/* Close the socket */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
perror_plus("close");
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2001
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2005
/* Sleep checking until interface is running.
2006
Check every 0.25s, up to total time of delay */
2007
for(int i=0; i < delay * 4; i++){
2008
if(interface_is_running(interface)){
2011
struct timespec sleeptime = { .tv_nsec = 250000000 };
2012
ret = nanosleep(&sleeptime, NULL);
2013
if(ret == -1 and errno != EINTR){
2014
perror_plus("nanosleep");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t take_down_interface(const char *const interface){
2024
error_t old_errno = errno;
2025
struct ifreq network;
2026
unsigned int if_index = if_nametoindex(interface);
2028
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2032
if(interface_is_up(interface)){
2033
error_t ret_errno = 0, ioctl_errno = 0;
2034
if(not get_flags(interface, &network) and debug){
2036
fprintf_plus(stderr, "Failed to get flags for interface "
2037
"\"%s\"\n", interface);
2041
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2043
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2046
perror_plus("socket");
2052
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2056
/* Raise privileges */
2057
ret_errno = raise_privileges();
2060
perror_plus("Failed to raise privileges");
2063
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2064
ioctl_errno = errno;
2066
/* If raise_privileges() succeeded above */
2068
/* Lower privileges */
2069
ret_errno = lower_privileges();
2072
perror_plus("Failed to lower privileges");
2076
/* Close the socket */
2077
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2079
perror_plus("close");
2082
if(ret_setflags == -1){
2083
errno = ioctl_errno;
2084
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2089
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2097
1511
int main(int argc, char *argv[]){
2098
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2099
.priority = "SECURE256:!CTYPE-X.509:"
2100
"+CTYPE-OPENPGP", .current_server = NULL,
2101
.interfaces = NULL, .interfaces_size = 0 };
2102
1512
AvahiSServiceBrowser *sb = NULL;
2105
1515
intmax_t tmpmax;
2107
1517
int exitcode = EXIT_SUCCESS;
2108
char *interfaces_to_take_down = NULL;
2109
size_t interfaces_to_take_down_size = 0;
2110
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2111
char old_tempdir[] = "/tmp/mandosXXXXXX";
2112
char *tempdir = NULL;
1518
const char *interface = "";
1519
struct ifreq network;
1521
bool take_down_interface = false;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
2113
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2114
1527
const char *seckey = PATHDIR "/" SECKEY;
2115
1528
const char *pubkey = PATHDIR "/" PUBKEY;
2116
char *interfaces_hooks = NULL;
2118
1530
bool gnutls_initialized = false;
2119
1531
bool gpgme_initialized = false;
2346
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
2350
1760
/* Lower privileges */
2351
ret_errno = lower_privileges();
2354
perror_plus("Failed to lower privileges");
2359
/* Remove invalid interface names (except "none") */
2361
char *interface = NULL;
2362
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2364
if(strcmp(interface, "none") != 0
2365
and if_nametoindex(interface) == 0){
2366
if(interface[0] != '\0'){
2367
fprintf_plus(stderr, "Not using nonexisting interface"
2368
" \"%s\"\n", interface);
2370
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1764
perror_plus("seteuid");
2376
1769
/* Run network hooks */
2378
if(mc.interfaces != NULL){
2379
interfaces_hooks = malloc(mc.interfaces_size);
2380
if(interfaces_hooks == NULL){
2381
perror_plus("malloc");
2384
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2385
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2387
run_network_hooks("start", interfaces_hooks != NULL ?
2388
interfaces_hooks : "", delay);
1770
if(not run_network_hooks("start", interface, delay)){
2392
1775
avahi_set_log_function(empty_log);
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
if(interface == NULL){
1796
perror_plus("malloc");
1798
exitcode = EXIT_FAILURE;
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
2395
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2396
1811
from the signal handler */
2397
1812
/* Initialize the pseudo-RNG for Avahi */
2398
1813
srand((unsigned int) time(NULL));
2399
simple_poll = avahi_simple_poll_new();
2400
if(simple_poll == NULL){
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
2401
1816
fprintf_plus(stderr,
2402
1817
"Avahi: Failed to create simple poll object.\n");
2403
1818
exitcode = EX_UNAVAILABLE;
2470
/* If no interfaces were specified, make a list */
2471
if(mc.interfaces == NULL){
2472
struct dirent **direntries = NULL;
2473
/* Look for any good interfaces */
2474
ret = scandir(sys_class_net, &direntries, good_interface,
2477
/* Add all found interfaces to interfaces list */
2478
for(int i = 0; i < ret; ++i){
2479
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2480
direntries[i]->d_name);
2483
perror_plus("argz_add");
2484
free(direntries[i]);
2488
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2489
direntries[i]->d_name);
2491
free(direntries[i]);
2498
fprintf_plus(stderr, "Could not find a network interface\n");
2499
exitcode = EXIT_FAILURE;
2504
/* Bring up interfaces which are down, and remove any "none"s */
2506
char *interface = NULL;
2507
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2509
/* If interface name is "none", stop bringing up interfaces.
2510
Also remove all instances of "none" from the list */
2511
if(strcmp(interface, "none") == 0){
2512
argz_delete(&mc.interfaces, &mc.interfaces_size,
2515
while((interface = argz_next(mc.interfaces,
2516
mc.interfaces_size, interface))){
2517
if(strcmp(interface, "none") == 0){
2518
argz_delete(&mc.interfaces, &mc.interfaces_size,
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1898
/* Re-raise priviliges */
1902
perror_plus("seteuid");
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1914
#endif /* __linux__ */
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1924
perror_plus("klogctl");
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1932
perror_plus("seteuid");
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
perror_plus("ioctl SIOCGIFFLAGS");
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1944
perror_plus("klogctl");
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1953
perror_plus("seteuid");
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1969
perror_plus("klogctl");
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1977
perror_plus("seteuid");
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
2525
bool interface_was_up = interface_is_up(interface);
2526
errno = bring_up_interface(interface, delay);
2527
if(not interface_was_up){
2529
perror_plus("Failed to bring up interface");
2531
errno = argz_add(&interfaces_to_take_down,
2532
&interfaces_to_take_down_size,
2535
perror_plus("argz_add");
2540
if(debug and (interfaces_to_take_down == NULL)){
2541
fprintf_plus(stderr, "No interfaces were brought up\n");
2545
/* If we only got one interface, explicitly use only that one */
2546
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2548
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2551
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
perror_plus("close");
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2009
perror_plus("klogctl");
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2015
/* Lower privileges */
2018
perror_plus("seteuid");
2558
ret = init_gnutls_global(pubkey, seckey, &mc);
2026
ret = init_gnutls_global(pubkey, seckey);
2560
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2561
2029
exitcode = EX_UNAVAILABLE;
2764
2220
mc.current_server->prev->next = NULL;
2765
2221
while(mc.current_server != NULL){
2766
2222
server *next = mc.current_server->next;
2768
#pragma GCC diagnostic push
2769
#pragma GCC diagnostic ignored "-Wcast-qual"
2771
free((char *)(mc.current_server->ip));
2773
#pragma GCC diagnostic pop
2775
2223
free(mc.current_server);
2776
2224
mc.current_server = next;
2780
/* Re-raise privileges */
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2231
/* Re-raise priviliges */
2782
ret_errno = raise_privileges();
2785
perror_plus("Failed to raise privileges");
2788
/* Run network hooks */
2789
run_network_hooks("stop", interfaces_hooks != NULL ?
2790
interfaces_hooks : "", delay);
2792
/* Take down the network interfaces which were brought up */
2794
char *interface = NULL;
2795
while((interface=argz_next(interfaces_to_take_down,
2796
interfaces_to_take_down_size,
2798
ret_errno = take_down_interface(interface);
2801
perror_plus("Failed to take down interface");
2804
if(debug and (interfaces_to_take_down == NULL)){
2805
fprintf_plus(stderr, "No interfaces needed to be taken"
2236
perror_plus("seteuid");
2811
ret_errno = lower_privileges_permanently();
2814
perror_plus("Failed to lower privileges permanently");
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
perror_plus("close");
2818
free(interfaces_to_take_down);
2819
free(interfaces_hooks);
2257
/* Lower privileges permanently */
2261
perror_plus("setuid");
2821
2264
/* Removes the GPGME temp directory and all files inside */
2822
if(tempdir != NULL){
2265
if(tempdir_created){
2823
2266
struct dirent **direntries = NULL;
2824
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2828
if(tempdir_fd == -1){
2829
perror_plus("open");
2832
#if __GLIBC_PREREQ(2, 15)
2833
int numentries = scandirat(tempdir_fd, ".", &direntries,
2834
notdotentries, alphasort);
2835
#else /* not __GLIBC_PREREQ(2, 15) */
2836
int numentries = scandir(tempdir, &direntries, notdotentries,
2838
#endif /* not __GLIBC_PREREQ(2, 15) */
2839
#else /* not __GLIBC__ */
2840
int numentries = scandir(tempdir, &direntries, notdotentries,
2842
#endif /* not __GLIBC__ */
2843
if(numentries >= 0){
2844
for(int i = 0; i < numentries; i++){
2845
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2847
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2848
" \"%s\", 0): %s\n", tempdir,
2849
direntries[i]->d_name, strerror(errno));
2851
free(direntries[i]);
2854
/* need to clean even if 0 because man page doesn't specify */
2856
if(numentries == -1){
2857
perror_plus("scandir");
2859
ret = rmdir(tempdir);
2860
if(ret == -1 and errno != ENOENT){
2861
perror_plus("rmdir");
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
2273
char *fullname = NULL;
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
perror_plus("asprintf");
2280
ret = remove(fullname);
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2864
TEMP_FAILURE_RETRY(close(tempdir_fd));
2289
/* need to clean even if 0 because man page doesn't specify */
2291
if (numentries == -1){
2292
perror_plus("scandir");
2294
ret = rmdir(tempdir);
2295
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");