616
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
617
651
__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 delete_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_delete_local_route(const bool add,
709
AvahiIfIndex if_index){
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char debug_flag[] = "--debug";
715
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
716
if(pluginhelperdir == NULL){
718
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
719
" variable not set; cannot run helper\n");
724
char interface[IF_NAMESIZE];
725
if(if_indextoname((unsigned int)if_index, interface) == NULL){
726
perror_plus("if_indextoname");
730
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
732
perror_plus("open(\"/dev/null\", O_RDONLY)");
738
/* Raise privileges */
739
errno = raise_privileges_permanently();
741
perror_plus("Failed to raise privileges");
742
/* _exit(EX_NOPERM); */
748
perror_plus("setgid");
751
/* Reset supplementary groups */
753
ret = setgroups(0, NULL);
755
perror_plus("setgroups");
759
ret = dup2(devnull, STDIN_FILENO);
761
perror_plus("dup2(devnull, STDIN_FILENO)");
764
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
766
perror_plus("close");
769
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
771
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
774
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
779
if(helperdir_fd == -1){
781
_exit(EX_UNAVAILABLE);
783
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
786
perror_plus("openat");
787
_exit(EX_UNAVAILABLE);
789
TEMP_FAILURE_RETRY(close(helperdir_fd));
791
#pragma GCC diagnostic push
792
#pragma GCC diagnostic ignored "-Wcast-qual"
794
if(fexecve(helper_fd, (char *const [])
795
{ helper, add ? add_arg : delete_arg, (char *)address,
796
interface, debug ? debug_flag : NULL, NULL },
799
#pragma GCC diagnostic pop
801
perror_plus("fexecve");
813
pret = waitpid(pid, &status, 0);
814
if(pret == -1 and errno == EINTR and quit_now){
815
int errno_raising = 0;
816
if((errno = raise_privileges()) != 0){
817
errno_raising = errno;
818
perror_plus("Failed to raise privileges in order to"
819
" kill helper program");
821
if(kill(pid, SIGTERM) == -1){
824
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
825
perror_plus("Failed to lower privileges after killing"
830
} while(pret == -1 and errno == EINTR);
832
perror_plus("waitpid");
835
if(WIFEXITED(status)){
836
if(WEXITSTATUS(status) != 0){
837
fprintf_plus(stderr, "Error: iprouteadddel exited"
838
" with status %d\n", WEXITSTATUS(status));
843
if(WIFSIGNALED(status)){
844
fprintf_plus(stderr, "Error: iprouteadddel died by"
845
" signal %d\n", WTERMSIG(status));
848
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
852
__attribute__((nonnull, warn_unused_result))
853
static bool add_local_route(const char *address,
854
AvahiIfIndex if_index){
856
fprintf_plus(stderr, "Adding route to %s\n", address);
858
return add_delete_local_route(true, address, if_index);
861
__attribute__((nonnull, warn_unused_result))
862
static bool delete_local_route(const char *address,
863
AvahiIfIndex if_index){
865
fprintf_plus(stderr, "Removing route to %s\n", address);
867
return add_delete_local_route(false, address, if_index);
619
870
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
871
__attribute__((nonnull, warn_unused_result))
872
static int start_mandos_communication(const char *ip, in_port_t port,
621
873
AvahiIfIndex if_index,
874
int af, mandos_context *mc){
623
875
int ret, tcp_sd = -1;
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
877
struct sockaddr_storage to;
629
878
char *buffer = NULL;
630
879
char *decrypted_buffer = NULL;
631
880
size_t buffer_length = 0;
732
1008
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
1009
perror_plus("if_indextoname");
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
1011
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1012
"\n", ip, interface, (uintmax_t)port);
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
1015
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1016
ip, (uintmax_t)port);
742
1018
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
1019
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
753
perror_plus("inet_ntop");
755
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
774
perror_plus("connect");
1021
ret = getnameinfo((struct sockaddr *)&to,
1022
sizeof(struct sockaddr_in6),
1023
addrstr, sizeof(addrstr), NULL, 0,
1026
ret = getnameinfo((struct sockaddr *)&to,
1027
sizeof(struct sockaddr_in),
1028
addrstr, sizeof(addrstr), NULL, 0,
1031
if(ret == EAI_SYSTEM){
1032
perror_plus("getnameinfo");
1033
} else if(ret != 0) {
1034
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1035
} else if(strcmp(addrstr, ip) != 0){
1036
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1047
ret = connect(tcp_sd, (struct sockaddr *)&to,
1048
sizeof(struct sockaddr_in6));
1050
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1051
sizeof(struct sockaddr_in));
1054
if(errno == ENETUNREACH
1055
and if_index != AVAHI_IF_UNSPEC
1056
and connect_to == NULL
1057
and not route_added and
1058
((af == AF_INET6 and not
1059
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1061
or (af == AF_INET and
1062
/* Not a a IPv4LL address */
1063
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1064
& 0xFFFF0000L) != 0xA9FE0000L))){
1065
/* Work around Avahi bug - Avahi does not announce link-local
1066
addresses if it has a global address, so local hosts with
1067
*only* a link-local address (e.g. Mandos clients) cannot
1068
connect to a Mandos server announced by Avahi on a server
1069
host with a global address. Work around this by retrying
1070
with an explicit route added with the server's address.
1072
Avahi bug reference:
1073
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1074
https://bugs.debian.org/587961
1077
fprintf_plus(stderr, "Mandos server unreachable, trying"
1081
route_added = add_local_route(ip, if_index);
1087
if(errno != ECONNREFUSED or debug){
1089
perror_plus("connect");
785
1102
const char *out = mandos_protocol_version;
1380
1715
ret = avahi_simple_poll_iterate(s, (int)block_time);
1383
if (ret > 0 or errno != EINTR){
1718
if(ret > 0 or errno != EINTR){
1384
1719
return (ret != 1) ? ret : 0;
1390
bool run_network_hooks(const char *mode, const char *interface,
1725
__attribute__((nonnull))
1726
void run_network_hooks(const char *mode, const char *interface,
1391
1727
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1728
struct dirent **direntries = NULL;
1729
if(hookdir_fd == -1){
1730
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1732
if(hookdir_fd == -1){
1733
if(errno == ENOENT){
1735
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1736
" found\n", hookdir);
1739
perror_plus("open");
1745
#if __GLIBC_PREREQ(2, 15)
1746
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1747
runnable_hook, alphasort);
1748
#else /* not __GLIBC_PREREQ(2, 15) */
1749
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1751
#endif /* not __GLIBC_PREREQ(2, 15) */
1752
#else /* not __GLIBC__ */
1753
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1755
#endif /* not __GLIBC__ */
1397
1756
if(numhooks == -1){
1398
1757
perror_plus("scandir");
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1760
struct dirent *direntry;
1762
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1764
perror_plus("open(\"/dev/null\", O_RDONLY)");
1767
for(int i = 0; i < numhooks; i++){
1768
direntry = direntries[i];
1770
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1773
pid_t hook_pid = fork();
1776
/* Raise privileges */
1777
errno = raise_privileges_permanently();
1779
perror_plus("Failed to raise privileges");
1786
perror_plus("setgid");
1789
/* Reset supplementary groups */
1791
ret = setgroups(0, NULL);
1793
perror_plus("setgroups");
1796
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1798
perror_plus("setenv");
1801
ret = setenv("DEVICE", interface, 1);
1803
perror_plus("setenv");
1806
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1808
perror_plus("setenv");
1811
ret = setenv("MODE", mode, 1);
1813
perror_plus("setenv");
1817
ret = asprintf(&delaystring, "%f", (double)delay);
1406
1819
perror_plus("asprintf");
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1413
pid_t hook_pid = fork();
1416
/* Raise privileges */
1420
perror_plus("seteuid");
1422
/* Raise privileges even more */
1426
perror_plus("setuid");
1432
perror_plus("setgid");
1434
/* Reset supplementary groups */
1436
ret = setgroups(0, NULL);
1438
perror_plus("setgroups");
1440
dup2(devnull, STDIN_FILENO);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1445
perror_plus("setenv");
1448
ret = setenv("DEVICE", interface, 1);
1450
perror_plus("setenv");
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1455
perror_plus("setenv");
1458
ret = setenv("MODE", mode, 1);
1460
perror_plus("setenv");
1464
ret = asprintf(&delaystring, "%f", delay);
1466
perror_plus("asprintf");
1469
ret = setenv("DELAY", delaystring, 1);
1472
perror_plus("setenv");
1822
ret = setenv("DELAY", delaystring, 1);
1475
1824
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to);
1479
perror_plus("setenv");
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1825
perror_plus("setenv");
1829
if(connect_to != NULL){
1830
ret = setenv("CONNECT", connect_to, 1);
1832
perror_plus("setenv");
1836
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1840
perror_plus("openat");
1841
_exit(EXIT_FAILURE);
1843
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1844
perror_plus("close");
1845
_exit(EXIT_FAILURE);
1847
ret = dup2(devnull, STDIN_FILENO);
1849
perror_plus("dup2(devnull, STDIN_FILENO)");
1852
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1854
perror_plus("close");
1857
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1859
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1862
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1864
perror_plus("fexecve");
1865
_exit(EXIT_FAILURE);
1869
perror_plus("fork");
1874
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1875
perror_plus("waitpid");
1879
if(WIFEXITED(status)){
1880
if(WEXITSTATUS(status) != 0){
1881
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1882
" with status %d\n", direntry->d_name,
1883
WEXITSTATUS(status));
1887
} else if(WIFSIGNALED(status)){
1888
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1889
" signal %d\n", direntry->d_name,
1894
fprintf_plus(stderr, "Warning: network hook \"%s\""
1895
" crashed\n", direntry->d_name);
1901
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1907
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1908
perror_plus("close");
1915
__attribute__((nonnull, warn_unused_result))
1916
error_t bring_up_interface(const char *const interface,
1918
error_t old_errno = errno;
1920
struct ifreq network;
1921
unsigned int if_index = if_nametoindex(interface);
1923
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1933
if(not interface_is_up(interface)){
1934
error_t ret_errno = 0, ioctl_errno = 0;
1935
if(not get_flags(interface, &network)){
1937
fprintf_plus(stderr, "Failed to get flags for interface "
1938
"\"%s\"\n", interface);
1942
network.ifr_flags |= IFF_UP; /* set flag */
1944
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1947
perror_plus("socket");
1953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1955
perror_plus("close");
1962
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1966
/* Raise privileges */
1967
ret_errno = raise_privileges();
1970
perror_plus("Failed to raise privileges");
1975
bool restore_loglevel = false;
1977
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1978
messages about the network interface to mess up the prompt */
1979
ret_linux = klogctl(8, NULL, 5);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1983
restore_loglevel = true;
1986
#endif /* __linux__ */
1987
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1988
ioctl_errno = errno;
1990
if(restore_loglevel){
1991
ret_linux = klogctl(7, NULL, 0);
1992
if(ret_linux == -1){
1993
perror_plus("klogctl");
1996
#endif /* __linux__ */
1998
/* If raise_privileges() succeeded above */
2000
/* Lower privileges */
2001
ret_errno = lower_privileges();
2004
perror_plus("Failed to lower privileges");
2008
/* Close the socket */
2009
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2011
perror_plus("close");
2014
if(ret_setflags == -1){
2015
errno = ioctl_errno;
2016
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2021
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2025
/* Sleep checking until interface is running.
2026
Check every 0.25s, up to total time of delay */
2027
for(int i=0; i < delay * 4; i++){
2028
if(interface_is_running(interface)){
2031
struct timespec sleeptime = { .tv_nsec = 250000000 };
2032
ret = nanosleep(&sleeptime, NULL);
2033
if(ret == -1 and errno != EINTR){
2034
perror_plus("nanosleep");
2042
__attribute__((nonnull, warn_unused_result))
2043
error_t take_down_interface(const char *const interface){
2044
error_t old_errno = errno;
2045
struct ifreq network;
2046
unsigned int if_index = if_nametoindex(interface);
2048
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2052
if(interface_is_up(interface)){
2053
error_t ret_errno = 0, ioctl_errno = 0;
2054
if(not get_flags(interface, &network) and debug){
2056
fprintf_plus(stderr, "Failed to get flags for interface "
2057
"\"%s\"\n", interface);
2061
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2063
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2066
perror_plus("socket");
2072
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2076
/* Raise privileges */
2077
ret_errno = raise_privileges();
2080
perror_plus("Failed to raise privileges");
2083
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2084
ioctl_errno = errno;
2086
/* If raise_privileges() succeeded above */
2088
/* Lower privileges */
2089
ret_errno = lower_privileges();
2092
perror_plus("Failed to lower privileges");
2096
/* Close the socket */
2097
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2099
perror_plus("close");
2102
if(ret_setflags == -1){
2103
errno = ioctl_errno;
2104
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2109
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1526
2117
int main(int argc, char *argv[]){
2118
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2119
.priority = "SECURE256:!CTYPE-X.509:"
2120
"+CTYPE-OPENPGP", .current_server = NULL,
2121
.interfaces = NULL, .interfaces_size = 0 };
1527
2122
AvahiSServiceBrowser *sb = NULL;
1530
2125
intmax_t tmpmax;
1532
2127
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1536
bool take_down_interface = false;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
2128
char *interfaces_to_take_down = NULL;
2129
size_t interfaces_to_take_down_size = 0;
2130
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2131
char old_tempdir[] = "/tmp/mandosXXXXXX";
2132
char *tempdir = NULL;
1541
2133
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
2134
const char *seckey = PATHDIR "/" SECKEY;
1543
2135
const char *pubkey = PATHDIR "/" PUBKEY;
2136
char *interfaces_hooks = NULL;
1545
2138
bool gnutls_initialized = false;
1546
2139
bool gpgme_initialized = false;
1769
2366
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
2370
/* Lower privileges */
1777
perror_plus("seteuid");
2371
ret_errno = lower_privileges();
2374
perror_plus("Failed to lower privileges");
2379
/* Remove invalid interface names (except "none") */
2381
char *interface = NULL;
2382
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2384
if(strcmp(interface, "none") != 0
2385
and if_nametoindex(interface) == 0){
2386
if(interface[0] != '\0'){
2387
fprintf_plus(stderr, "Not using nonexisting interface"
2388
" \"%s\"\n", interface);
2390
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
1782
2396
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
2398
if(mc.interfaces != NULL){
2399
interfaces_hooks = malloc(mc.interfaces_size);
2400
if(interfaces_hooks == NULL){
2401
perror_plus("malloc");
2404
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2405
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2407
run_network_hooks("start", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
1788
2412
avahi_set_log_function(empty_log);
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1797
/* No up interfaces, look for any good interfaces */
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1808
if(interface == NULL){
1809
perror_plus("malloc");
1811
exitcode = EXIT_FAILURE;
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1823
2415
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
2416
from the signal handler */
1825
2417
/* Initialize the pseudo-RNG for Avahi */
1826
2418
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
2419
simple_poll = avahi_simple_poll_new();
2420
if(simple_poll == NULL){
1829
2421
fprintf_plus(stderr,
1830
2422
"Avahi: Failed to create simple poll object.\n");
1831
2423
exitcode = EX_UNAVAILABLE;
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
1900
if_index = (AvahiIfIndex) if_nametoindex(interface);
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1911
/* Re-raise priviliges */
1915
perror_plus("seteuid");
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1927
#endif /* __linux__ */
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1937
perror_plus("klogctl");
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1945
perror_plus("seteuid");
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1952
perror_plus("ioctl SIOCGIFFLAGS");
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1957
perror_plus("klogctl");
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1966
perror_plus("seteuid");
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1982
perror_plus("klogctl");
2490
/* If no interfaces were specified, make a list */
2491
if(mc.interfaces == NULL){
2492
struct dirent **direntries = NULL;
2493
/* Look for any good interfaces */
2494
ret = scandir(sys_class_net, &direntries, good_interface,
2497
/* Add all found interfaces to interfaces list */
2498
for(int i = 0; i < ret; ++i){
2499
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2500
direntries[i]->d_name);
2503
perror_plus("argz_add");
2504
free(direntries[i]);
2508
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2509
direntries[i]->d_name);
2511
free(direntries[i]);
2518
fprintf_plus(stderr, "Could not find a network interface\n");
2519
exitcode = EXIT_FAILURE;
2524
/* Bring up interfaces which are down, and remove any "none"s */
2526
char *interface = NULL;
2527
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2529
/* If interface name is "none", stop bringing up interfaces.
2530
Also remove all instances of "none" from the list */
2531
if(strcmp(interface, "none") == 0){
2532
argz_delete(&mc.interfaces, &mc.interfaces_size,
2535
while((interface = argz_next(mc.interfaces,
2536
mc.interfaces_size, interface))){
2537
if(strcmp(interface, "none") == 0){
2538
argz_delete(&mc.interfaces, &mc.interfaces_size,
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1990
perror_plus("seteuid");
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2014
perror_plus("close");
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2022
perror_plus("klogctl");
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2028
/* Lower privileges */
2031
perror_plus("seteuid");
2545
bool interface_was_up = interface_is_up(interface);
2546
errno = bring_up_interface(interface, delay);
2547
if(not interface_was_up){
2549
perror_plus("Failed to bring up interface");
2551
errno = argz_add(&interfaces_to_take_down,
2552
&interfaces_to_take_down_size,
2555
perror_plus("argz_add");
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces were brought up\n");
2565
/* If we only got one interface, explicitly use only that one */
2566
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2568
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2571
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2039
ret = init_gnutls_global(pubkey, seckey);
2578
ret = init_gnutls_global(pubkey, seckey, &mc);
2041
2580
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
2581
exitcode = EX_UNAVAILABLE;
2233
2784
mc.current_server->prev->next = NULL;
2234
2785
while(mc.current_server != NULL){
2235
2786
server *next = mc.current_server->next;
2788
#pragma GCC diagnostic push
2789
#pragma GCC diagnostic ignored "-Wcast-qual"
2791
free((char *)(mc.current_server->ip));
2793
#pragma GCC diagnostic pop
2236
2795
free(mc.current_server);
2237
2796
mc.current_server = next;
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2244
/* Re-raise priviliges */
2800
/* Re-raise privileges */
2249
perror_plus("seteuid");
2802
ret_errno = raise_privileges();
2805
perror_plus("Failed to raise privileges");
2808
/* Run network hooks */
2809
run_network_hooks("stop", interfaces_hooks != NULL ?
2810
interfaces_hooks : "", delay);
2812
/* Take down the network interfaces which were brought up */
2814
char *interface = NULL;
2815
while((interface=argz_next(interfaces_to_take_down,
2816
interfaces_to_take_down_size,
2818
ret_errno = take_down_interface(interface);
2821
perror_plus("Failed to take down interface");
2824
if(debug and (interfaces_to_take_down == NULL)){
2825
fprintf_plus(stderr, "No interfaces needed to be taken"
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2266
perror_plus("close");
2831
ret_errno = lower_privileges_permanently();
2834
perror_plus("Failed to lower privileges permanently");
2270
/* Lower privileges permanently */
2274
perror_plus("setuid");
2838
free(interfaces_to_take_down);
2839
free(interfaces_hooks);
2277
2841
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2842
if(tempdir != NULL){
2279
2843
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2290
perror_plus("asprintf");
2293
ret = remove(fullname);
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2844
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2848
if(tempdir_fd == -1){
2849
perror_plus("open");
2852
#if __GLIBC_PREREQ(2, 15)
2853
int numentries = scandirat(tempdir_fd, ".", &direntries,
2854
notdotentries, alphasort);
2855
#else /* not __GLIBC_PREREQ(2, 15) */
2856
int numentries = scandir(tempdir, &direntries, notdotentries,
2858
#endif /* not __GLIBC_PREREQ(2, 15) */
2859
#else /* not __GLIBC__ */
2860
int numentries = scandir(tempdir, &direntries, notdotentries,
2862
#endif /* not __GLIBC__ */
2863
if(numentries >= 0){
2864
for(int i = 0; i < numentries; i++){
2865
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2867
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2868
" \"%s\", 0): %s\n", tempdir,
2869
direntries[i]->d_name, strerror(errno));
2871
free(direntries[i]);
2874
/* need to clean even if 0 because man page doesn't specify */
2876
if(numentries == -1){
2877
perror_plus("scandir");
2879
ret = rmdir(tempdir);
2880
if(ret == -1 and errno != ENOENT){
2881
perror_plus("rmdir");
2302
/* need to clean even if 0 because man page doesn't specify */
2304
if (numentries == -1){
2305
perror_plus("scandir");
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2884
TEMP_FAILURE_RETRY(close(tempdir_fd));