820
499
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
500
__attribute__((unused)) const char *txt){}
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
879
AvahiIfIndex if_index){
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
918
perror_plus("setgid");
921
/* Reset supplementary groups */
923
ret = setgroups(0, NULL);
925
perror_plus("setgroups");
929
ret = dup2(devnull, STDIN_FILENO);
931
perror_plus("dup2(devnull, STDIN_FILENO)");
934
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
936
perror_plus("close");
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
if(helperdir_fd == -1){
951
_exit(EX_UNAVAILABLE);
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
perror_plus("openat");
957
_exit(EX_UNAVAILABLE);
959
TEMP_FAILURE_RETRY(close(helperdir_fd));
961
#pragma GCC diagnostic push
962
#pragma GCC diagnostic ignored "-Wcast-qual"
964
if(fexecve(helper_fd, (char *const [])
965
{ helper, add ? add_arg : delete_arg, (char *)address,
966
interface, debug ? debug_flag : NULL, NULL },
969
#pragma GCC diagnostic pop
971
perror_plus("fexecve");
983
pret = waitpid(pid, &status, 0);
984
if(pret == -1 and errno == EINTR and quit_now){
985
int errno_raising = 0;
986
if((errno = raise_privileges()) != 0){
987
errno_raising = errno;
988
perror_plus("Failed to raise privileges in order to"
989
" kill helper program");
991
if(kill(pid, SIGTERM) == -1){
994
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
995
perror_plus("Failed to lower privileges after killing"
1000
} while(pret == -1 and errno == EINTR);
1002
perror_plus("waitpid");
1005
if(WIFEXITED(status)){
1006
if(WEXITSTATUS(status) != 0){
1007
fprintf_plus(stderr, "Error: iprouteadddel exited"
1008
" with status %d\n", WEXITSTATUS(status));
1013
if(WIFSIGNALED(status)){
1014
fprintf_plus(stderr, "Error: iprouteadddel died by"
1015
" signal %d\n", WTERMSIG(status));
1018
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1022
__attribute__((nonnull, warn_unused_result))
1023
static bool add_local_route(const char *address,
1024
AvahiIfIndex if_index){
1026
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
return add_delete_local_route(true, address, if_index);
1031
__attribute__((nonnull, warn_unused_result))
1032
static bool delete_local_route(const char *address,
1033
AvahiIfIndex if_index){
1035
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
return add_delete_local_route(false, address, if_index);
1040
502
/* Called when a Mandos server is found */
1041
__attribute__((nonnull, warn_unused_result))
1042
static int start_mandos_communication(const char *ip, in_port_t port,
503
static int start_mandos_communication(const char *ip, uint16_t port,
1043
504
AvahiIfIndex if_index,
1044
int af, mandos_context *mc){
1045
int ret, tcp_sd = -1;
1047
struct sockaddr_storage to;
508
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1048
509
char *buffer = NULL;
1049
char *decrypted_buffer = NULL;
510
char *decrypted_buffer;
1050
511
size_t buffer_length = 0;
1051
512
size_t buffer_capacity = 0;
513
ssize_t decrypted_buffer_size;
516
char interface[IF_NAMESIZE];
1054
517
gnutls_session_t session;
1055
int pf; /* Protocol family */
1056
bool route_added = false;
1073
fprintf_plus(stderr, "Bad address family: %d\n", af);
1078
/* If the interface is specified and we have a list of interfaces */
1079
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1080
/* Check if the interface is one of the interfaces we are using */
1083
char *interface = NULL;
1084
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
if(if_nametoindex(interface) == (unsigned int)if_index){
1093
/* This interface does not match any in the list, so we don't
1094
connect to the server */
1096
char interface[IF_NAMESIZE];
1097
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1098
perror_plus("if_indextoname");
1100
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
if_indextoname((unsigned int)if_index,
1110
ret = init_gnutls_session(&session, mc);
519
ret = init_gnutls_session(mc, &session);
1116
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1117
PRIuMAX "\n", ip, (uintmax_t)port);
1120
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1123
perror_plus("socket");
525
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
529
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
536
if(if_indextoname((unsigned int)if_index, interface) == NULL){
537
perror("if_indextoname");
540
fprintf(stderr, "Binding to interface %s\n", interface);
1133
543
memset(&to, 0, sizeof(to));
1135
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1136
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1138
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1139
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
544
to.in6.sin6_family = AF_INET6;
545
/* It would be nice to have a way to detect if we were passed an
546
IPv4 address here. Now we assume an IPv6 address. */
547
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1143
perror_plus("inet_pton");
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1157
if(if_index == AVAHI_IF_UNSPEC){
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
1163
/* Set the network interface number as scope */
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
553
fprintf(stderr, "Bad address: %s\n", ip);
556
to.in6.sin6_port = htons(port); /* Spurious warning */
558
to.in6.sin6_scope_id = (uint32_t)if_index;
1176
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1177
char interface[IF_NAMESIZE];
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1179
perror_plus("if_indextoname");
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1224
if(errno == ENETUNREACH
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1242
Avahi bug reference:
1243
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1251
route_added = add_local_route(ip, if_index);
1257
if(errno != ECONNREFUSED or debug){
1259
perror_plus("connect");
561
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
563
char addrstr[INET6_ADDRSTRLEN] = "";
564
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
565
sizeof(addrstr)) == NULL){
568
if(strcmp(addrstr, ip) != 0){
569
fprintf(stderr, "Canonical address form: %s\n", addrstr);
574
ret = connect(tcp_sd, &to.in, sizeof(to));
1272
580
const char *out = mandos_protocol_version;
1601
806
case AVAHI_BROWSER_ALL_FOR_NOW:
1602
807
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1604
fprintf_plus(stderr, "No Mandos server found, still"
809
fprintf(stderr, "No Mandos server found, still searching...\n");
1611
/* Signal handler that stops main loop after SIGTERM */
1612
static void handle_sigterm(int sig){
1617
signal_received = sig;
1618
int old_errno = errno;
1619
/* set main loop to exit */
1620
if(simple_poll != NULL){
1621
avahi_simple_poll_quit(simple_poll);
1626
__attribute__((nonnull, warn_unused_result))
1627
bool get_flags(const char *ifname, struct ifreq *ifr){
1631
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
perror_plus("socket");
1638
strcpy(ifr->ifr_name, ifname);
1639
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
perror_plus("ioctl SIOCGIFFLAGS");
1651
__attribute__((nonnull, warn_unused_result))
1652
bool good_flags(const char *ifname, const struct ifreq *ifr){
1654
/* Reject the loopback device */
1655
if(ifr->ifr_flags & IFF_LOOPBACK){
1657
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1662
/* Accept point-to-point devices only if connect_to is specified */
1663
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1665
fprintf_plus(stderr, "Accepting point-to-point interface"
1666
" \"%s\"\n", ifname);
1670
/* Otherwise, reject non-broadcast-capable devices */
1671
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1673
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1674
" \"%s\"\n", ifname);
1678
/* Reject non-ARP interfaces (including dummy interfaces) */
1679
if(ifr->ifr_flags & IFF_NOARP){
1681
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1687
/* Accept this device */
1689
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1695
* This function determines if a directory entry in /sys/class/net
1696
* corresponds to an acceptable network device.
1697
* (This function is passed to scandir(3) as a filter function.)
1699
__attribute__((nonnull, warn_unused_result))
1700
int good_interface(const struct dirent *if_entry){
1701
if(if_entry->d_name[0] == '.'){
1706
if(not get_flags(if_entry->d_name, &ifr)){
1708
fprintf_plus(stderr, "Failed to get flags for interface "
1709
"\"%s\"\n", if_entry->d_name);
1714
if(not good_flags(if_entry->d_name, &ifr)){
1721
* This function determines if a network interface is up.
1723
__attribute__((nonnull, warn_unused_result))
1724
bool interface_is_up(const char *interface){
1726
if(not get_flags(interface, &ifr)){
1728
fprintf_plus(stderr, "Failed to get flags for interface "
1729
"\"%s\"\n", interface);
1734
return (bool)(ifr.ifr_flags & IFF_UP);
1738
* This function determines if a network interface is running
1740
__attribute__((nonnull, warn_unused_result))
1741
bool interface_is_running(const char *interface){
1743
if(not get_flags(interface, &ifr)){
1745
fprintf_plus(stderr, "Failed to get flags for interface "
1746
"\"%s\"\n", interface);
1751
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1754
__attribute__((nonnull, pure, warn_unused_result))
1755
int notdotentries(const struct dirent *direntry){
1756
/* Skip "." and ".." */
1757
if(direntry->d_name[0] == '.'
1758
and (direntry->d_name[1] == '\0'
1759
or (direntry->d_name[1] == '.'
1760
and direntry->d_name[2] == '\0'))){
1766
/* Is this directory entry a runnable program? */
1767
__attribute__((nonnull, warn_unused_result))
1768
int runnable_hook(const struct dirent *direntry){
1773
if((direntry->d_name)[0] == '\0'){
1778
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1779
"abcdefghijklmnopqrstuvwxyz"
1782
if((direntry->d_name)[sret] != '\0'){
1783
/* Contains non-allowed characters */
1785
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1791
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1794
perror_plus("Could not stat hook");
1798
if(not (S_ISREG(st.st_mode))){
1799
/* Not a regular file */
1801
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1806
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1807
/* Not executable */
1809
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1815
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1821
__attribute__((nonnull, warn_unused_result))
1822
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1823
mandos_context *mc){
1825
struct timespec now;
1826
struct timespec waited_time;
1827
intmax_t block_time;
1830
if(mc->current_server == NULL){
1832
fprintf_plus(stderr, "Wait until first server is found."
1835
ret = avahi_simple_poll_iterate(s, -1);
1838
fprintf_plus(stderr, "Check current_server if we should run"
1841
/* the current time */
1842
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1844
perror_plus("clock_gettime");
1847
/* Calculating in ms how long time between now and server
1848
who we visted longest time ago. Now - last seen. */
1849
waited_time.tv_sec = (now.tv_sec
1850
- mc->current_server->last_seen.tv_sec);
1851
waited_time.tv_nsec = (now.tv_nsec
1852
- mc->current_server->last_seen.tv_nsec);
1853
/* total time is 10s/10,000ms.
1854
Converting to s from ms by dividing by 1,000,
1855
and ns to ms by dividing by 1,000,000. */
1856
block_time = ((retry_interval
1857
- ((intmax_t)waited_time.tv_sec * 1000))
1858
- ((intmax_t)waited_time.tv_nsec / 1000000));
1861
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1865
if(block_time <= 0){
1866
ret = start_mandos_communication(mc->current_server->ip,
1867
mc->current_server->port,
1868
mc->current_server->if_index,
1869
mc->current_server->af, mc);
1871
avahi_simple_poll_quit(s);
1874
ret = clock_gettime(CLOCK_MONOTONIC,
1875
&mc->current_server->last_seen);
1877
perror_plus("clock_gettime");
1880
mc->current_server = mc->current_server->next;
1881
block_time = 0; /* Call avahi to find new Mandos
1882
servers, but don't block */
1885
ret = avahi_simple_poll_iterate(s, (int)block_time);
1888
if(ret > 0 or errno != EINTR){
1889
return (ret != 1) ? ret : 0;
1895
__attribute__((nonnull))
1896
void run_network_hooks(const char *mode, const char *interface,
1898
struct dirent **direntries = NULL;
1899
if(hookdir_fd == -1){
1900
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1902
if(hookdir_fd == -1){
1903
if(errno == ENOENT){
1905
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1906
" found\n", hookdir);
1909
perror_plus("open");
1915
#if __GLIBC_PREREQ(2, 15)
1916
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1917
runnable_hook, alphasort);
1918
#else /* not __GLIBC_PREREQ(2, 15) */
1919
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1921
#endif /* not __GLIBC_PREREQ(2, 15) */
1922
#else /* not __GLIBC__ */
1923
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1925
#endif /* not __GLIBC__ */
1927
perror_plus("scandir");
1930
struct dirent *direntry;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
pid_t hook_pid = fork();
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1949
perror_plus("Failed to raise privileges");
1956
perror_plus("setgid");
1959
/* Reset supplementary groups */
1961
ret = setgroups(0, NULL);
1963
perror_plus("setgroups");
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
perror_plus("setenv");
1971
ret = setenv("DEVICE", interface, 1);
1973
perror_plus("setenv");
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
perror_plus("setenv");
1981
ret = setenv("MODE", mode, 1);
1983
perror_plus("setenv");
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1989
perror_plus("asprintf");
1992
ret = setenv("DELAY", delaystring, 1);
1995
perror_plus("setenv");
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2002
perror_plus("setenv");
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2013
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2017
ret = dup2(devnull, STDIN_FILENO);
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
2024
perror_plus("close");
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2039
perror_plus("fork");
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2077
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2078
perror_plus("close");
2085
__attribute__((nonnull, warn_unused_result))
2086
error_t bring_up_interface(const char *const interface,
2088
error_t old_errno = errno;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2103
if(not interface_is_up(interface)){
2104
error_t ret_errno = 0, ioctl_errno = 0;
2105
if(not get_flags(interface, &network)){
2107
fprintf_plus(stderr, "Failed to get flags for interface "
2108
"\"%s\"\n", interface);
2112
network.ifr_flags |= IFF_UP; /* set flag */
2114
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
perror_plus("socket");
815
int main(int argc, char *argv[]){
816
AvahiSServiceBrowser *sb = NULL;
819
int exitcode = EXIT_SUCCESS;
820
const char *interface = "eth0";
821
struct ifreq network;
825
char *connect_to = NULL;
826
char tempdir[] = "/tmp/mandosXXXXXX";
827
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
828
const char *seckey = PATHDIR "/" SECKEY;
829
const char *pubkey = PATHDIR "/" PUBKEY;
831
mandos_context mc = { .simple_poll = NULL, .server = NULL,
832
.dh_bits = 1024, .priority = "SECURE256"
833
":!CTYPE-X.509:+CTYPE-OPENPGP" };
834
bool gnutls_initalized = false;
835
bool gpgme_initalized = false;
838
struct argp_option options[] = {
839
{ .name = "debug", .key = 128,
840
.doc = "Debug mode", .group = 3 },
841
{ .name = "connect", .key = 'c',
842
.arg = "ADDRESS:PORT",
843
.doc = "Connect directly to a specific Mandos server",
845
{ .name = "interface", .key = 'i',
847
.doc = "Interface that will be used to search for Mandos"
850
{ .name = "seckey", .key = 's',
852
.doc = "OpenPGP secret key file base name",
854
{ .name = "pubkey", .key = 'p',
856
.doc = "OpenPGP public key file base name",
858
{ .name = "dh-bits", .key = 129,
860
.doc = "Bit length of the prime number used in the"
861
" Diffie-Hellman key exchange",
863
{ .name = "priority", .key = 130,
865
.doc = "GnuTLS priority string for the TLS handshake",
870
error_t parse_opt(int key, char *arg,
871
struct argp_state *state) {
873
case 128: /* --debug */
876
case 'c': /* --connect */
879
case 'i': /* --interface */
882
case 's': /* --seckey */
885
case 'p': /* --pubkey */
888
case 129: /* --dh-bits */
889
ret = sscanf(arg, "%u", &mc.dh_bits);
891
fprintf(stderr, "Bad number of DH bits\n");
895
case 130: /* --priority */
903
return ARGP_ERR_UNKNOWN;
908
struct argp argp = { .options = options, .parser = parse_opt,
910
.doc = "Mandos client -- Get and decrypt"
911
" passwords from a Mandos server" };
912
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
913
if(ret == ARGP_ERR_UNKNOWN){
914
fprintf(stderr, "Unknown error while parsing arguments\n");
915
exitcode = EXIT_FAILURE;
920
/* If the interface is down, bring it up */
922
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
exitcode = EXIT_FAILURE;
928
strcpy(network.ifr_name, interface);
929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
perror("ioctl SIOCGIFFLAGS");
932
exitcode = EXIT_FAILURE;
935
if((network.ifr_flags & IFF_UP) == 0){
936
network.ifr_flags |= IFF_UP;
937
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
perror("ioctl SIOCSIFFLAGS");
940
exitcode = EXIT_FAILURE;
2123
944
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2125
perror_plus("close");
2132
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2136
/* Raise privileges */
2137
ret_errno = raise_privileges();
2140
perror_plus("Failed to raise privileges");
2145
bool restore_loglevel = false;
2147
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2148
messages about the network interface to mess up the prompt */
2149
ret_linux = klogctl(8, NULL, 5);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
963
ret = init_gnutls_global(&mc, pubkey, seckey);
965
fprintf(stderr, "init_gnutls_global failed\n");
966
exitcode = EXIT_FAILURE;
969
gnutls_initalized = true;
972
if(mkdtemp(tempdir) == NULL){
978
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
979
fprintf(stderr, "gpgme_initalized failed\n");
980
exitcode = EXIT_FAILURE;
983
gpgme_initalized = true;
986
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
fprintf(stderr, "No such interface: \"%s\"\n", interface);
992
if(connect_to != NULL){
993
/* Connect directly, do not use Zeroconf */
994
/* (Mainly meant for debugging) */
995
char *address = strrchr(connect_to, ':');
997
fprintf(stderr, "No colon in address\n");
998
exitcode = EXIT_FAILURE;
1002
ret = sscanf(address+1, "%" SCNu16, &port);
1004
fprintf(stderr, "Bad port number\n");
1005
exitcode = EXIT_FAILURE;
1009
address = connect_to;
1010
ret = start_mandos_communication(address, port, if_index, &mc);
1012
exitcode = EXIT_FAILURE;
2153
restore_loglevel = true;
2156
#endif /* __linux__ */
2157
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2158
ioctl_errno = errno;
2160
if(restore_loglevel){
2161
ret_linux = klogctl(7, NULL, 0);
2162
if(ret_linux == -1){
2163
perror_plus("klogctl");
2166
#endif /* __linux__ */
2168
/* If raise_privileges() succeeded above */
2170
/* Lower privileges */
2171
ret_errno = lower_privileges();
2174
perror_plus("Failed to lower privileges");
2178
/* Close the socket */
2179
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2181
perror_plus("close");
2184
if(ret_setflags == -1){
2185
errno = ioctl_errno;
2186
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2191
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2195
/* Sleep checking until interface is running.
2196
Check every 0.25s, up to total time of delay */
2197
for(int i=0; i < delay * 4; i++){
2198
if(interface_is_running(interface)){
2201
struct timespec sleeptime = { .tv_nsec = 250000000 };
2202
ret = nanosleep(&sleeptime, NULL);
2203
if(ret == -1 and errno != EINTR){
2204
perror_plus("nanosleep");
2212
__attribute__((nonnull, warn_unused_result))
2213
error_t take_down_interface(const char *const interface){
2214
error_t old_errno = errno;
2215
struct ifreq network;
2216
unsigned int if_index = if_nametoindex(interface);
2218
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2222
if(interface_is_up(interface)){
2223
error_t ret_errno = 0, ioctl_errno = 0;
2224
if(not get_flags(interface, &network) and debug){
2226
fprintf_plus(stderr, "Failed to get flags for interface "
2227
"\"%s\"\n", interface);
2231
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2233
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2236
perror_plus("socket");
2242
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
/* Raise privileges */
2247
ret_errno = raise_privileges();
2250
perror_plus("Failed to raise privileges");
2253
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2254
ioctl_errno = errno;
2256
/* If raise_privileges() succeeded above */
2258
/* Lower privileges */
2259
ret_errno = lower_privileges();
2262
perror_plus("Failed to lower privileges");
2266
/* Close the socket */
2267
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2269
perror_plus("close");
2272
if(ret_setflags == -1){
2273
errno = ioctl_errno;
2274
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2279
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2287
int main(int argc, char *argv[]){
2288
mandos_context mc = { .server = NULL, .dh_bits = 0,
2289
.priority = "SECURE256:!CTYPE-X.509:"
2290
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2291
.interfaces = NULL, .interfaces_size = 0 };
2292
AvahiSServiceBrowser *sb = NULL;
2297
int exitcode = EXIT_SUCCESS;
2298
char *interfaces_to_take_down = NULL;
2299
size_t interfaces_to_take_down_size = 0;
2300
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2301
char old_tempdir[] = "/tmp/mandosXXXXXX";
2302
char *tempdir = NULL;
2303
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2304
const char *seckey = PATHDIR "/" SECKEY;
2305
const char *pubkey = PATHDIR "/" PUBKEY;
2306
const char *dh_params_file = NULL;
2307
char *interfaces_hooks = NULL;
2309
bool gnutls_initialized = false;
2310
bool gpgme_initialized = false;
2312
double retry_interval = 10; /* 10s between trying a server and
2313
retrying the same server again */
2315
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2316
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2321
/* Lower any group privileges we might have, just to be safe */
2325
perror_plus("setgid");
2328
/* Lower user privileges (temporarily) */
2332
perror_plus("seteuid");
2340
struct argp_option options[] = {
2341
{ .name = "debug", .key = 128,
2342
.doc = "Debug mode", .group = 3 },
2343
{ .name = "connect", .key = 'c',
2344
.arg = "ADDRESS:PORT",
2345
.doc = "Connect directly to a specific Mandos server",
2347
{ .name = "interface", .key = 'i',
2349
.doc = "Network interface that will be used to search for"
2352
{ .name = "seckey", .key = 's',
2354
.doc = "OpenPGP secret key file base name",
2356
{ .name = "pubkey", .key = 'p',
2358
.doc = "OpenPGP public key file base name",
2360
{ .name = "dh-bits", .key = 129,
2362
.doc = "Bit length of the prime number used in the"
2363
" Diffie-Hellman key exchange",
2365
{ .name = "dh-params", .key = 134,
2367
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2368
" for the Diffie-Hellman key exchange",
2370
{ .name = "priority", .key = 130,
2372
.doc = "GnuTLS priority string for the TLS handshake",
2374
{ .name = "delay", .key = 131,
2376
.doc = "Maximum delay to wait for interface startup",
2378
{ .name = "retry", .key = 132,
2380
.doc = "Retry interval used when denied by the Mandos server",
2382
{ .name = "network-hook-dir", .key = 133,
2384
.doc = "Directory where network hooks are located",
2387
* These reproduce what we would get without ARGP_NO_HELP
2389
{ .name = "help", .key = '?',
2390
.doc = "Give this help list", .group = -1 },
2391
{ .name = "usage", .key = -3,
2392
.doc = "Give a short usage message", .group = -1 },
2393
{ .name = "version", .key = 'V',
2394
.doc = "Print program version", .group = -1 },
2398
error_t parse_opt(int key, char *arg,
2399
struct argp_state *state){
2402
case 128: /* --debug */
2405
case 'c': /* --connect */
2408
case 'i': /* --interface */
2409
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2412
argp_error(state, "%s", strerror(ret_errno));
2415
case 's': /* --seckey */
2418
case 'p': /* --pubkey */
2421
case 129: /* --dh-bits */
2423
tmpmax = strtoimax(arg, &tmp, 10);
2424
if(errno != 0 or tmp == arg or *tmp != '\0'
2425
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2426
argp_error(state, "Bad number of DH bits");
2428
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2430
case 134: /* --dh-params */
2431
dh_params_file = arg;
2433
case 130: /* --priority */
2436
case 131: /* --delay */
2438
delay = strtof(arg, &tmp);
2439
if(errno != 0 or tmp == arg or *tmp != '\0'){
2440
argp_error(state, "Bad delay");
2442
case 132: /* --retry */
2444
retry_interval = strtod(arg, &tmp);
2445
if(errno != 0 or tmp == arg or *tmp != '\0'
2446
or (retry_interval * 1000) > INT_MAX
2447
or retry_interval < 0){
2448
argp_error(state, "Bad retry interval");
2451
case 133: /* --network-hook-dir */
2455
* These reproduce what we would get without ARGP_NO_HELP
2457
case '?': /* --help */
2458
argp_state_help(state, state->out_stream,
2459
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2460
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2461
case -3: /* --usage */
2462
argp_state_help(state, state->out_stream,
2463
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2464
case 'V': /* --version */
2465
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2466
exit(argp_err_exit_status);
2469
return ARGP_ERR_UNKNOWN;
2474
struct argp argp = { .options = options, .parser = parse_opt,
2476
.doc = "Mandos client -- Get and decrypt"
2477
" passwords from a Mandos server" };
2478
ret = argp_parse(&argp, argc, argv,
2479
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2486
perror_plus("argp_parse");
2487
exitcode = EX_OSERR;
2490
exitcode = EX_USAGE;
2496
/* Work around Debian bug #633582:
2497
<http://bugs.debian.org/633582> */
2499
/* Re-raise privileges */
2500
ret_errno = raise_privileges();
2503
perror_plus("Failed to raise privileges");
2507
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2508
int seckey_fd = open(seckey, O_RDONLY);
2509
if(seckey_fd == -1){
2510
perror_plus("open");
2512
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2514
perror_plus("fstat");
2516
if(S_ISREG(st.st_mode)
2517
and st.st_uid == 0 and st.st_gid == 0){
2518
ret = fchown(seckey_fd, uid, gid);
2520
perror_plus("fchown");
2524
TEMP_FAILURE_RETRY(close(seckey_fd));
2528
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2529
int pubkey_fd = open(pubkey, O_RDONLY);
2530
if(pubkey_fd == -1){
2531
perror_plus("open");
2533
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2535
perror_plus("fstat");
2537
if(S_ISREG(st.st_mode)
2538
and st.st_uid == 0 and st.st_gid == 0){
2539
ret = fchown(pubkey_fd, uid, gid);
2541
perror_plus("fchown");
2545
TEMP_FAILURE_RETRY(close(pubkey_fd));
2549
/* Lower privileges */
2550
ret_errno = lower_privileges();
2553
perror_plus("Failed to lower privileges");
2558
/* Remove invalid interface names (except "none") */
2560
char *interface = NULL;
2561
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2563
if(strcmp(interface, "none") != 0
2564
and if_nametoindex(interface) == 0){
2565
if(interface[0] != '\0'){
2566
fprintf_plus(stderr, "Not using nonexisting interface"
2567
" \"%s\"\n", interface);
2569
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2575
/* Run network hooks */
2577
if(mc.interfaces != NULL){
2578
interfaces_hooks = malloc(mc.interfaces_size);
2579
if(interfaces_hooks == NULL){
2580
perror_plus("malloc");
2583
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2584
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2586
run_network_hooks("start", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2591
avahi_set_log_function(empty_log);
2594
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2595
from the signal handler */
2596
/* Initialize the pseudo-RNG for Avahi */
2597
srand((unsigned int) time(NULL));
2598
simple_poll = avahi_simple_poll_new();
2599
if(simple_poll == NULL){
2600
fprintf_plus(stderr,
2601
"Avahi: Failed to create simple poll object.\n");
2602
exitcode = EX_UNAVAILABLE;
2606
sigemptyset(&sigterm_action.sa_mask);
2607
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2609
perror_plus("sigaddset");
2610
exitcode = EX_OSERR;
2613
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2615
perror_plus("sigaddset");
2616
exitcode = EX_OSERR;
2619
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2621
perror_plus("sigaddset");
2622
exitcode = EX_OSERR;
2625
/* Need to check if the handler is SIG_IGN before handling:
2626
| [[info:libc:Initial Signal Actions]] |
2627
| [[info:libc:Basic Signal Handling]] |
2629
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2631
perror_plus("sigaction");
2634
if(old_sigterm_action.sa_handler != SIG_IGN){
2635
ret = sigaction(SIGINT, &sigterm_action, NULL);
2637
perror_plus("sigaction");
2638
exitcode = EX_OSERR;
2642
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2644
perror_plus("sigaction");
2647
if(old_sigterm_action.sa_handler != SIG_IGN){
2648
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2650
perror_plus("sigaction");
2651
exitcode = EX_OSERR;
2655
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2657
perror_plus("sigaction");
2660
if(old_sigterm_action.sa_handler != SIG_IGN){
2661
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2663
perror_plus("sigaction");
2664
exitcode = EX_OSERR;
2669
/* If no interfaces were specified, make a list */
2670
if(mc.interfaces == NULL){
2671
struct dirent **direntries = NULL;
2672
/* Look for any good interfaces */
2673
ret = scandir(sys_class_net, &direntries, good_interface,
2676
/* Add all found interfaces to interfaces list */
2677
for(int i = 0; i < ret; ++i){
2678
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2679
direntries[i]->d_name);
2682
perror_plus("argz_add");
2683
free(direntries[i]);
2687
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2688
direntries[i]->d_name);
2690
free(direntries[i]);
2697
fprintf_plus(stderr, "Could not find a network interface\n");
2698
exitcode = EXIT_FAILURE;
2703
/* Bring up interfaces which are down, and remove any "none"s */
2705
char *interface = NULL;
2706
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2708
/* If interface name is "none", stop bringing up interfaces.
2709
Also remove all instances of "none" from the list */
2710
if(strcmp(interface, "none") == 0){
2711
argz_delete(&mc.interfaces, &mc.interfaces_size,
2714
while((interface = argz_next(mc.interfaces,
2715
mc.interfaces_size, interface))){
2716
if(strcmp(interface, "none") == 0){
2717
argz_delete(&mc.interfaces, &mc.interfaces_size,
2724
bool interface_was_up = interface_is_up(interface);
2725
errno = bring_up_interface(interface, delay);
2726
if(not interface_was_up){
2728
perror_plus("Failed to bring up interface");
2730
errno = argz_add(&interfaces_to_take_down,
2731
&interfaces_to_take_down_size,
2734
perror_plus("argz_add");
2739
if(debug and (interfaces_to_take_down == NULL)){
2740
fprintf_plus(stderr, "No interfaces were brought up\n");
2744
/* If we only got one interface, explicitly use only that one */
2745
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2747
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2750
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2757
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2759
fprintf_plus(stderr, "init_gnutls_global failed\n");
2760
exitcode = EX_UNAVAILABLE;
2763
gnutls_initialized = true;
2770
/* Try /run/tmp before /tmp */
2771
tempdir = mkdtemp(run_tempdir);
2772
if(tempdir == NULL and errno == ENOENT){
2774
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2775
run_tempdir, old_tempdir);
2777
tempdir = mkdtemp(old_tempdir);
2779
if(tempdir == NULL){
2780
perror_plus("mkdtemp");
2788
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2789
fprintf_plus(stderr, "init_gpgme failed\n");
2790
exitcode = EX_UNAVAILABLE;
2793
gpgme_initialized = true;
2800
if(connect_to != NULL){
2801
/* Connect directly, do not use Zeroconf */
2802
/* (Mainly meant for debugging) */
2803
char *address = strrchr(connect_to, ':');
2805
if(address == NULL){
2806
fprintf_plus(stderr, "No colon in address\n");
2807
exitcode = EX_USAGE;
2817
tmpmax = strtoimax(address+1, &tmp, 10);
2818
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2819
or tmpmax != (in_port_t)tmpmax){
2820
fprintf_plus(stderr, "Bad port number\n");
2821
exitcode = EX_USAGE;
2829
port = (in_port_t)tmpmax;
2831
/* Colon in address indicates IPv6 */
2833
if(strchr(connect_to, ':') != NULL){
2835
/* Accept [] around IPv6 address - see RFC 5952 */
2836
if(connect_to[0] == '[' and address[-1] == ']')
2844
address = connect_to;
2850
while(not quit_now){
2851
ret = start_mandos_communication(address, port, if_index, af,
2853
if(quit_now or ret == 0){
2857
fprintf_plus(stderr, "Retrying in %d seconds\n",
2858
(int)retry_interval);
2860
sleep((unsigned int)retry_interval);
2864
exitcode = EXIT_SUCCESS;
2875
AvahiServerConfig config;
2876
/* Do not publish any local Zeroconf records */
2877
avahi_server_config_init(&config);
2878
config.publish_hinfo = 0;
2879
config.publish_addresses = 0;
2880
config.publish_workstation = 0;
2881
config.publish_domain = 0;
2883
/* Allocate a new server */
2884
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2885
&config, NULL, NULL, &ret_errno);
2887
/* Free the Avahi configuration data */
2888
avahi_server_config_free(&config);
2891
/* Check if creating the Avahi server object succeeded */
2892
if(mc.server == NULL){
2893
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2894
avahi_strerror(ret_errno));
2895
exitcode = EX_UNAVAILABLE;
2903
/* Create the Avahi service browser */
2904
sb = avahi_s_service_browser_new(mc.server, if_index,
2905
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2906
NULL, 0, browse_callback,
2909
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2910
avahi_strerror(avahi_server_errno(mc.server)));
2911
exitcode = EX_UNAVAILABLE;
2919
/* Run the main loop */
2922
fprintf_plus(stderr, "Starting Avahi loop search\n");
2925
ret = avahi_loop_with_timeout(simple_poll,
2926
(int)(retry_interval * 1000), &mc);
2928
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2929
(ret == 0) ? "successfully" : "with error");
1014
exitcode = EXIT_SUCCESS;
1020
avahi_set_log_function(empty_log);
1023
/* Initialize the pseudo-RNG for Avahi */
1024
srand((unsigned int) time(NULL));
1026
/* Allocate main Avahi loop object */
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL) {
1029
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
exitcode = EXIT_FAILURE;
1036
AvahiServerConfig config;
1037
/* Do not publish any local Zeroconf records */
1038
avahi_server_config_init(&config);
1039
config.publish_hinfo = 0;
1040
config.publish_addresses = 0;
1041
config.publish_workstation = 0;
1042
config.publish_domain = 0;
1044
/* Allocate a new server */
1045
mc.server = avahi_server_new(avahi_simple_poll_get
1046
(mc.simple_poll), &config, NULL,
1049
/* Free the Avahi configuration data */
1050
avahi_server_config_free(&config);
1053
/* Check if creating the Avahi server object succeeded */
1054
if(mc.server == NULL) {
1055
fprintf(stderr, "Failed to create Avahi server: %s\n",
1056
avahi_strerror(error));
1057
exitcode = EXIT_FAILURE;
1061
/* Create the Avahi service browser */
1062
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
"_mandos._tcp", NULL, 0,
1065
browse_callback, &mc);
1067
fprintf(stderr, "Failed to create service browser: %s\n",
1068
avahi_strerror(avahi_server_errno(mc.server)));
1069
exitcode = EXIT_FAILURE;
1073
/* Run the main loop */
1076
fprintf(stderr, "Starting Avahi loop search\n");
1079
avahi_simple_poll_loop(mc.simple_poll);
2935
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2938
/* Cleanup things */
2939
free(mc.interfaces);
2942
avahi_s_service_browser_free(sb);
2944
if(mc.server != NULL)
2945
avahi_server_free(mc.server);
2947
if(simple_poll != NULL)
2948
avahi_simple_poll_free(simple_poll);
2950
if(gnutls_initialized){
2951
gnutls_certificate_free_credentials(mc.cred);
2952
gnutls_global_deinit();
2953
gnutls_dh_params_deinit(mc.dh_params);
2956
if(gpgme_initialized){
2957
gpgme_release(mc.ctx);
2960
/* Cleans up the circular linked list of Mandos servers the client
2962
if(mc.current_server != NULL){
2963
mc.current_server->prev->next = NULL;
2964
while(mc.current_server != NULL){
2965
server *next = mc.current_server->next;
2967
#pragma GCC diagnostic push
2968
#pragma GCC diagnostic ignored "-Wcast-qual"
2970
free((char *)(mc.current_server->ip));
2972
#pragma GCC diagnostic pop
2974
free(mc.current_server);
2975
mc.current_server = next;
2979
/* Re-raise privileges */
2981
ret_errno = raise_privileges();
2984
perror_plus("Failed to raise privileges");
2987
/* Run network hooks */
2988
run_network_hooks("stop", interfaces_hooks != NULL ?
2989
interfaces_hooks : "", delay);
2991
/* Take down the network interfaces which were brought up */
2993
char *interface = NULL;
2994
while((interface=argz_next(interfaces_to_take_down,
2995
interfaces_to_take_down_size,
2997
ret_errno = take_down_interface(interface);
3000
perror_plus("Failed to take down interface");
3003
if(debug and (interfaces_to_take_down == NULL)){
3004
fprintf_plus(stderr, "No interfaces needed to be taken"
3010
ret_errno = lower_privileges_permanently();
3013
perror_plus("Failed to lower privileges permanently");
3017
free(interfaces_to_take_down);
3018
free(interfaces_hooks);
3020
/* Removes the GPGME temp directory and all files inside */
3021
if(tempdir != NULL){
3022
struct dirent **direntries = NULL;
3023
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3027
if(tempdir_fd == -1){
3028
perror_plus("open");
3031
#if __GLIBC_PREREQ(2, 15)
3032
int numentries = scandirat(tempdir_fd, ".", &direntries,
3033
notdotentries, alphasort);
3034
#else /* not __GLIBC_PREREQ(2, 15) */
3035
int numentries = scandir(tempdir, &direntries, notdotentries,
3037
#endif /* not __GLIBC_PREREQ(2, 15) */
3038
#else /* not __GLIBC__ */
3039
int numentries = scandir(tempdir, &direntries, notdotentries,
3041
#endif /* not __GLIBC__ */
3042
if(numentries >= 0){
3043
for(int i = 0; i < numentries; i++){
3044
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3046
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3047
" \"%s\", 0): %s\n", tempdir,
3048
direntries[i]->d_name, strerror(errno));
3050
free(direntries[i]);
3053
/* need to clean even if 0 because man page doesn't specify */
3055
if(numentries == -1){
3056
perror_plus("scandir");
3058
ret = rmdir(tempdir);
3059
if(ret == -1 and errno != ENOENT){
3060
perror_plus("rmdir");
3063
TEMP_FAILURE_RETRY(close(tempdir_fd));
3068
sigemptyset(&old_sigterm_action.sa_mask);
3069
old_sigterm_action.sa_handler = SIG_DFL;
3070
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3071
&old_sigterm_action,
3074
perror_plus("sigaction");
3077
ret = raise(signal_received);
3078
} while(ret != 0 and errno == EINTR);
3080
perror_plus("raise");
3083
TEMP_FAILURE_RETRY(pause());
1084
fprintf(stderr, "%s exiting\n", argv[0]);
1087
/* Cleanup things */
1089
avahi_s_service_browser_free(sb);
1091
if(mc.server != NULL)
1092
avahi_server_free(mc.server);
1094
if(mc.simple_poll != NULL)
1095
avahi_simple_poll_free(mc.simple_poll);
1097
if(gnutls_initalized){
1098
gnutls_certificate_free_credentials(mc.cred);
1099
gnutls_global_deinit();
1100
gnutls_dh_params_deinit(mc.dh_params);
1103
if(gpgme_initalized){
1104
gpgme_release(mc.ctx);
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1113
if(errno != ENOENT){
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);
1141
if(ret == -1 and errno != ENOENT){