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- Committer: Teddy Hogeborn
- Date: 2012-06-16 22:38:54 UTC
- Revision ID: teddy@recompile.se-20120616223854-mfxkg6fgqr56sma5
* plugins.d/mandos-client (mandos_context): Removed "simple_poll"
member.
(simple_poll): New global variable. All users changed.
member.
(simple_poll): New global variable. All users changed.
added
removed
plugins.d/mandos-client.c
61
61
*/
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
63
strtoimax() */
64
#include <assert.h> /* assert() */
65
64
#include <errno.h> /* perror(), errno,
66
65
program_invocation_short_name */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
88
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
88
WEXITSTATUS(), WTERMSIG() */
90
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
93
argz_count() */
91
94
92
95
#ifdef __linux__
93
96
#include <sys/klog.h> /* klogctl() */
135
138
static const char sys_class_net[] = "/sys/class/net";
136
139
char *connect_to = NULL;
137
140
const char *hookdir = HOOKDIR;
141
uid_t uid = 65534;
142
gid_t gid = 65534;
138
143
139
144
/* Doubly linked list that need to be circularly linked when used */
140
145
typedef struct server{
141
146
const char *ip;
142
uint16_t port;
147
in_port_t port;
143
148
AvahiIfIndex if_index;
144
149
int af;
145
150
struct timespec last_seen;
149
154
150
155
/* Used for passing in values through the Avahi callback functions */
151
156
typedef struct {
152
AvahiSimplePoll *simple_poll;
153
157
AvahiServer *server;
154
158
gnutls_certificate_credentials_t cred;
155
159
unsigned int dh_bits;
159
163
server *current_server;
160
164
} mandos_context;
161
165
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
166
/* global so signal handler can reach it*/
167
AvahiSimplePoll *simple_poll;
168
mandos_context mc = { .server = NULL, .dh_bits = 1024,
169
.priority = "SECURE256:!CTYPE-X.509:"
170
"+CTYPE-OPENPGP", .current_server = NULL };
167
171
168
172
sig_atomic_t quit_now = 0;
169
173
int signal_received = 0;
205
209
}
206
210
207
211
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
212
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
209
213
int af){
210
214
int ret;
211
215
server *new_server = malloc(sizeof(server));
249
253
gpgme_error_t rc;
250
254
gpgme_engine_info_t engine_info;
251
255
252
253
256
/*
254
257
* Helper function to insert pub and seckey to the engine keyring.
255
258
*/
465
468
}
466
469
467
470
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
471
const char *ret = gnutls_strerror(value);
470
472
if(ret == NULL)
471
473
ret = "(unknown)";
472
474
return ret;
617
619
__attribute__((unused)) const char *txt){}
618
620
619
621
/* Called when a Mandos server is found */
620
static int start_mandos_communication(const char *ip, uint16_t port,
622
static int start_mandos_communication(const char *ip, in_port_t port,
621
623
AvahiIfIndex if_index,
622
624
int af){
623
625
int ret, tcp_sd = -1;
662
664
663
665
if(debug){
664
666
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
667
PRIuMAX "\n", ip, (uintmax_t)port);
666
668
}
667
669
668
670
tcp_sd = socket(pf, SOCK_STREAM, 0);
699
701
goto mandos_end;
700
702
}
701
703
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
704
to.in6.sin6_port = htons(port);
706
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
707
-Wunreachable-code*/
732
731
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
732
perror_plus("if_indextoname");
734
733
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
734
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
735
"\n", ip, interface, (uintmax_t)port);
737
736
}
738
737
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
738
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
739
ip, (uintmax_t)port);
741
740
}
742
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1004
1003
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1005
1004
flags,
1006
1005
AVAHI_GCC_UNUSED void* userdata){
1007
assert(r);
1006
if(r == NULL){
1007
return;
1008
}
1008
1009
1009
1010
/* Called whenever a service has been resolved successfully or
1010
1011
timed out */
1031
1032
PRIdMAX ") on port %" PRIu16 "\n", name,
1032
1033
host_name, ip, (intmax_t)interface, port);
1033
1034
}
1034
int ret = start_mandos_communication(ip, port, interface,
1035
int ret = start_mandos_communication(ip, (in_port_t)port,
1036
interface,
1035
1037
avahi_proto_to_af(proto));
1036
1038
if(ret == 0){
1037
avahi_simple_poll_quit(mc.simple_poll);
1039
avahi_simple_poll_quit(simple_poll);
1038
1040
} else {
1039
if(not add_server(ip, port, interface,
1041
if(not add_server(ip, (in_port_t)port, interface,
1040
1042
avahi_proto_to_af(proto))){
1041
1043
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1042
1044
" list\n", name);
1057
1059
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1058
1060
flags,
1059
1061
AVAHI_GCC_UNUSED void* userdata){
1060
assert(b);
1062
if(b == NULL){
1063
return;
1064
}
1061
1065
1062
1066
/* Called whenever a new services becomes available on the LAN or
1063
1067
is removed from the LAN */
1072
1076
1073
1077
fprintf_plus(stderr, "(Avahi browser) %s\n",
1074
1078
avahi_strerror(avahi_server_errno(mc.server)));
1075
avahi_simple_poll_quit(mc.simple_poll);
1079
avahi_simple_poll_quit(simple_poll);
1076
1080
return;
1077
1081
1078
1082
case AVAHI_BROWSER_NEW:
1111
1115
signal_received = sig;
1112
1116
int old_errno = errno;
1113
1117
/* set main loop to exit */
1114
if(mc.simple_poll != NULL){
1115
avahi_simple_poll_quit(mc.simple_poll);
1118
if(simple_poll != NULL){
1119
avahi_simple_poll_quit(simple_poll);
1116
1120
}
1117
1121
errno = old_errno;
1118
1122
}
1119
1123
1120
1124
bool get_flags(const char *ifname, struct ifreq *ifr){
1121
1125
int ret;
1126
error_t ret_errno;
1122
1127
1123
1128
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1124
1129
if(s < 0){
1130
ret_errno = errno;
1125
1131
perror_plus("socket");
1132
errno = ret_errno;
1126
1133
return false;
1127
1134
}
1128
1135
strcpy(ifr->ifr_name, ifname);
1129
1136
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1130
1137
if(ret == -1){
1131
1138
if(debug){
1139
ret_errno = errno;
1132
1140
perror_plus("ioctl SIOCGIFFLAGS");
1141
errno = ret_errno;
1133
1142
}
1134
1143
return false;
1135
1144
}
1204
1213
}
1205
1214
1206
1215
/*
1207
* This function determines if a directory entry in /sys/class/net
1208
* corresponds to an acceptable network device which is up.
1209
* (This function is passed to scandir(3) as a filter function.)
1210
*/
1211
int up_interface(const struct dirent *if_entry){
1212
if(if_entry->d_name[0] == '.'){
1213
return 0;
1214
}
1215
1216
struct ifreq ifr;
1217
if(not get_flags(if_entry->d_name, &ifr)){
1218
if(debug){
1219
fprintf_plus(stderr, "Failed to get flags for interface "
1220
"\"%s\"\n", if_entry->d_name);
1221
}
1222
return 0;
1223
}
1224
1225
/* Reject down interfaces */
1226
if(not (ifr.ifr_flags & IFF_UP)){
1227
if(debug){
1228
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1229
if_entry->d_name);
1230
}
1231
return 0;
1232
}
1233
1234
/* Reject non-running interfaces */
1235
if(not (ifr.ifr_flags & IFF_RUNNING)){
1236
if(debug){
1237
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1238
if_entry->d_name);
1239
}
1240
return 0;
1241
}
1242
1243
if(not good_flags(if_entry->d_name, &ifr)){
1244
return 0;
1245
}
1246
return 1;
1216
* This function determines if a network interface is up.
1217
*/
1218
bool interface_is_up(const char *interface){
1219
struct ifreq ifr;
1220
if(not get_flags(interface, &ifr)){
1221
if(debug){
1222
fprintf_plus(stderr, "Failed to get flags for interface "
1223
"\"%s\"\n", interface);
1224
}
1225
return false;
1226
}
1227
1228
return (bool)(ifr.ifr_flags & IFF_UP);
1229
}
1230
1231
/*
1232
* This function determines if a network interface is running
1233
*/
1234
bool interface_is_running(const char *interface){
1235
struct ifreq ifr;
1236
if(not get_flags(interface, &ifr)){
1237
if(debug){
1238
fprintf_plus(stderr, "Failed to get flags for interface "
1239
"\"%s\"\n", interface);
1240
}
1241
return false;
1242
}
1243
1244
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1247
1245
}
1248
1246
1249
1247
int notdotentries(const struct dirent *direntry){
1366
1364
mc.current_server->if_index,
1367
1365
mc.current_server->af);
1368
1366
if(ret == 0){
1369
avahi_simple_poll_quit(mc.simple_poll);
1367
avahi_simple_poll_quit(simple_poll);
1370
1368
return 0;
1371
1369
}
1372
1370
ret = clock_gettime(CLOCK_MONOTONIC,
1390
1388
}
1391
1389
}
1392
1390
1391
/* Set effective uid to 0, return errno */
1392
error_t raise_privileges(void){
1393
error_t old_errno = errno;
1394
error_t ret_errno = 0;
1395
if(seteuid(0) == -1){
1396
ret_errno = errno;
1397
perror_plus("seteuid");
1398
}
1399
errno = old_errno;
1400
return ret_errno;
1401
}
1402
1403
/* Set effective and real user ID to 0. Return errno. */
1404
error_t raise_privileges_permanently(void){
1405
error_t old_errno = errno;
1406
error_t ret_errno = raise_privileges();
1407
if(ret_errno != 0){
1408
errno = old_errno;
1409
return ret_errno;
1410
}
1411
if(setuid(0) == -1){
1412
ret_errno = errno;
1413
perror_plus("seteuid");
1414
}
1415
errno = old_errno;
1416
return ret_errno;
1417
}
1418
1419
/* Set effective user ID to unprivileged saved user ID */
1420
error_t lower_privileges(void){
1421
error_t old_errno = errno;
1422
error_t ret_errno = 0;
1423
if(seteuid(uid) == -1){
1424
ret_errno = errno;
1425
perror_plus("seteuid");
1426
}
1427
errno = old_errno;
1428
return ret_errno;
1429
}
1430
1431
/* Lower privileges permanently */
1432
error_t lower_privileges_permanently(void){
1433
error_t old_errno = errno;
1434
error_t ret_errno = 0;
1435
if(setuid(uid) == -1){
1436
ret_errno = errno;
1437
perror_plus("setuid");
1438
}
1439
errno = old_errno;
1440
return ret_errno;
1441
}
1442
1393
1443
bool run_network_hooks(const char *mode, const char *interface,
1394
1444
const float delay){
1395
1445
struct dirent **direntries;
1398
1448
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1399
1449
alphasort);
1400
1450
if(numhooks == -1){
1401
perror_plus("scandir");
1451
if(errno == ENOENT){
1452
if(debug){
1453
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1454
" found\n", hookdir);
1455
}
1456
} else {
1457
perror_plus("scandir");
1458
}
1402
1459
} else {
1403
1460
int devnull = open("/dev/null", O_RDONLY);
1404
1461
for(int i = 0; i < numhooks; i++){
1417
1474
if(hook_pid == 0){
1418
1475
/* Child */
1419
1476
/* Raise privileges */
1420
errno = 0;
1421
ret = seteuid(0);
1422
if(ret == -1){
1423
perror_plus("seteuid");
1424
}
1425
/* Raise privileges even more */
1426
errno = 0;
1427
ret = setuid(0);
1428
if(ret == -1){
1429
perror_plus("setuid");
1430
}
1477
raise_privileges_permanently();
1431
1478
/* Set group */
1432
1479
errno = 0;
1433
1480
ret = setgid(0);
1526
1573
return true;
1527
1574
}
1528
1575
1576
error_t bring_up_interface(const char *const interface,
1577
const float delay){
1578
int sd = -1;
1579
error_t old_errno = errno;
1580
error_t ret_errno = 0;
1581
int ret, ret_setflags;
1582
struct ifreq network;
1583
unsigned int if_index = if_nametoindex(interface);
1584
if(if_index == 0){
1585
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1586
errno = old_errno;
1587
return ENXIO;
1588
}
1589
1590
if(quit_now){
1591
errno = old_errno;
1592
return EINTR;
1593
}
1594
1595
if(not interface_is_up(interface)){
1596
if(not get_flags(interface, &network) and debug){
1597
ret_errno = errno;
1598
fprintf_plus(stderr, "Failed to get flags for interface "
1599
"\"%s\"\n", interface);
1600
return ret_errno;
1601
}
1602
network.ifr_flags |= IFF_UP;
1603
1604
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1605
if(sd < 0){
1606
ret_errno = errno;
1607
perror_plus("socket");
1608
errno = old_errno;
1609
return ret_errno;
1610
}
1611
1612
if(quit_now){
1613
close(sd);
1614
errno = old_errno;
1615
return EINTR;
1616
}
1617
1618
if(debug){
1619
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1620
interface);
1621
}
1622
1623
/* Raise priviliges */
1624
raise_privileges();
1625
1626
#ifdef __linux__
1627
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1628
messages about the network interface to mess up the prompt */
1629
int ret_linux = klogctl(8, NULL, 5);
1630
bool restore_loglevel = true;
1631
if(ret_linux == -1){
1632
restore_loglevel = false;
1633
perror_plus("klogctl");
1634
}
1635
#endif /* __linux__ */
1636
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1637
ret_errno = errno;
1638
#ifdef __linux__
1639
if(restore_loglevel){
1640
ret_linux = klogctl(7, NULL, 0);
1641
if(ret_linux == -1){
1642
perror_plus("klogctl");
1643
}
1644
}
1645
#endif /* __linux__ */
1646
1647
/* Lower privileges */
1648
lower_privileges();
1649
1650
/* Close the socket */
1651
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1652
if(ret == -1){
1653
perror_plus("close");
1654
}
1655
1656
if(ret_setflags == -1){
1657
errno = ret_errno;
1658
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1659
errno = old_errno;
1660
return ret_errno;
1661
}
1662
} else if(debug){
1663
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1664
interface);
1665
}
1666
1667
/* Sleep checking until interface is running.
1668
Check every 0.25s, up to total time of delay */
1669
for(int i=0; i < delay * 4; i++){
1670
if(interface_is_running(interface)){
1671
break;
1672
}
1673
struct timespec sleeptime = { .tv_nsec = 250000000 };
1674
ret = nanosleep(&sleeptime, NULL);
1675
if(ret == -1 and errno != EINTR){
1676
perror_plus("nanosleep");
1677
}
1678
}
1679
1680
errno = old_errno;
1681
return 0;
1682
}
1683
1684
error_t take_down_interface(const char *const interface){
1685
int sd = -1;
1686
error_t old_errno = errno;
1687
error_t ret_errno = 0;
1688
int ret, ret_setflags;
1689
struct ifreq network;
1690
unsigned int if_index = if_nametoindex(interface);
1691
if(if_index == 0){
1692
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1693
errno = old_errno;
1694
return ENXIO;
1695
}
1696
if(interface_is_up(interface)){
1697
if(not get_flags(interface, &network) and debug){
1698
ret_errno = errno;
1699
fprintf_plus(stderr, "Failed to get flags for interface "
1700
"\"%s\"\n", interface);
1701
return ret_errno;
1702
}
1703
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1704
1705
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1706
if(sd < 0){
1707
ret_errno = errno;
1708
perror_plus("socket");
1709
errno = old_errno;
1710
return ret_errno;
1711
}
1712
1713
if(debug){
1714
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1715
interface);
1716
}
1717
1718
/* Raise priviliges */
1719
raise_privileges();
1720
1721
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1722
ret_errno = errno;
1723
1724
/* Lower privileges */
1725
lower_privileges();
1726
1727
/* Close the socket */
1728
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1729
if(ret == -1){
1730
perror_plus("close");
1731
}
1732
1733
if(ret_setflags == -1){
1734
errno = ret_errno;
1735
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1736
errno = old_errno;
1737
return ret_errno;
1738
}
1739
} else if(debug){
1740
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1741
interface);
1742
}
1743
1744
errno = old_errno;
1745
return 0;
1746
}
1747
1529
1748
int main(int argc, char *argv[]){
1530
1749
AvahiSServiceBrowser *sb = NULL;
1531
int error;
1750
error_t ret_errno;
1532
1751
int ret;
1533
1752
intmax_t tmpmax;
1534
1753
char *tmp;
1535
1754
int exitcode = EXIT_SUCCESS;
1536
const char *interface = "";
1537
struct ifreq network;
1538
int sd = -1;
1539
bool take_down_interface = false;
1540
uid_t uid;
1541
gid_t gid;
1755
char *interfaces = NULL;
1756
size_t interfaces_size = 0;
1757
char *interfaces_to_take_down = NULL;
1758
size_t interfaces_to_take_down_size = 0;
1542
1759
char tempdir[] = "/tmp/mandosXXXXXX";
1543
1760
bool tempdir_created = false;
1544
1761
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1545
1762
const char *seckey = PATHDIR "/" SECKEY;
1546
1763
const char *pubkey = PATHDIR "/" PUBKEY;
1764
char *interfaces_hooks = NULL;
1765
size_t interfaces_hooks_size = 0;
1547
1766
1548
1767
bool gnutls_initialized = false;
1549
1768
bool gpgme_initialized = false;
1640
1859
connect_to = arg;
1641
1860
break;
1642
1861
case 'i': /* --interface */
1643
interface = arg;
1862
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1863
(int)',');
1864
if(ret_errno != 0){
1865
argp_error(state, "%s", strerror(ret_errno));
1866
}
1644
1867
break;
1645
1868
case 's': /* --seckey */
1646
1869
seckey = arg;
1724
1947
<http://bugs.debian.org/633582> */
1725
1948
1726
1949
/* Re-raise priviliges */
1727
errno = 0;
1728
ret = seteuid(0);
1729
if(ret == -1){
1730
perror_plus("seteuid");
1731
} else {
1950
if(raise_privileges() == 0){
1732
1951
struct stat st;
1733
1952
1734
1953
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1782
2001
}
1783
2002
}
1784
2003
2004
/* Remove empty interface names */
2005
{
2006
char *interface = NULL;
2007
while((interface = argz_next(interfaces, interfaces_size,
2008
interface))){
2009
if(if_nametoindex(interface) == 0){
2010
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2011
fprintf_plus(stderr, "Not using nonexisting interface"
2012
" \"%s\"\n", interface);
2013
}
2014
argz_delete(&interfaces, &interfaces_size, interface);
2015
interface = NULL;
2016
}
2017
}
2018
}
2019
1785
2020
/* Run network hooks */
1786
if(not run_network_hooks("start", interface, delay)){
1787
goto end;
2021
{
2022
2023
if(interfaces != NULL){
2024
interfaces_hooks = malloc(interfaces_size);
2025
if(interfaces_hooks == NULL){
2026
perror_plus("malloc");
2027
goto end;
2028
}
2029
memcpy(interfaces_hooks, interfaces, interfaces_size);
2030
interfaces_hooks_size = interfaces_size;
2031
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2032
(int)',');
2033
}
2034
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2035
interfaces_hooks : "", delay)){
2036
goto end;
2037
}
1788
2038
}
1789
2039
1790
2040
if(not debug){
1791
2041
avahi_set_log_function(empty_log);
1792
2042
}
1793
2043
1794
if(interface[0] == '\0'){
1795
struct dirent **direntries;
1796
/* First look for interfaces that are up */
1797
ret = scandir(sys_class_net, &direntries, up_interface,
1798
alphasort);
1799
if(ret == 0){
1800
/* No up interfaces, look for any good interfaces */
1801
free(direntries);
1802
ret = scandir(sys_class_net, &direntries, good_interface,
1803
alphasort);
1804
}
1805
if(ret >= 1){
1806
/* Pick the first interface returned */
1807
interface = strdup(direntries[0]->d_name);
1808
if(debug){
1809
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1810
}
1811
if(interface == NULL){
1812
perror_plus("malloc");
1813
free(direntries);
1814
exitcode = EXIT_FAILURE;
1815
goto end;
1816
}
1817
free(direntries);
1818
} else {
1819
free(direntries);
1820
fprintf_plus(stderr, "Could not find a network interface\n");
1821
exitcode = EXIT_FAILURE;
1822
goto end;
1823
}
1824
}
1825
1826
2044
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1827
2045
from the signal handler */
1828
2046
/* Initialize the pseudo-RNG for Avahi */
1829
2047
srand((unsigned int) time(NULL));
1830
mc.simple_poll = avahi_simple_poll_new();
1831
if(mc.simple_poll == NULL){
2048
simple_poll = avahi_simple_poll_new();
2049
if(simple_poll == NULL){
1832
2050
fprintf_plus(stderr,
1833
2051
"Avahi: Failed to create simple poll object.\n");
1834
2052
exitcode = EX_UNAVAILABLE;
1898
2116
}
1899
2117
}
1900
2118
1901
/* If the interface is down, bring it up */
1902
if(strcmp(interface, "none") != 0){
1903
if_index = (AvahiIfIndex) if_nametoindex(interface);
1904
if(if_index == 0){
1905
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1906
exitcode = EX_UNAVAILABLE;
1907
goto end;
1908
}
1909
1910
if(quit_now){
1911
goto end;
1912
}
1913
1914
/* Re-raise priviliges */
1915
errno = 0;
1916
ret = seteuid(0);
1917
if(ret == -1){
1918
perror_plus("seteuid");
1919
}
1920
1921
#ifdef __linux__
1922
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1923
messages about the network interface to mess up the prompt */
1924
ret = klogctl(8, NULL, 5);
1925
bool restore_loglevel = true;
1926
if(ret == -1){
1927
restore_loglevel = false;
1928
perror_plus("klogctl");
1929
}
1930
#endif /* __linux__ */
1931
1932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1933
if(sd < 0){
1934
perror_plus("socket");
1935
exitcode = EX_OSERR;
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
ret = klogctl(7, NULL, 0);
1939
if(ret == -1){
1940
perror_plus("klogctl");
1941
}
1942
}
1943
#endif /* __linux__ */
1944
/* Lower privileges */
1945
errno = 0;
1946
ret = seteuid(uid);
1947
if(ret == -1){
1948
perror_plus("seteuid");
1949
}
1950
goto end;
1951
}
1952
strcpy(network.ifr_name, interface);
1953
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1954
if(ret == -1){
1955
perror_plus("ioctl SIOCGIFFLAGS");
1956
#ifdef __linux__
1957
if(restore_loglevel){
1958
ret = klogctl(7, NULL, 0);
1959
if(ret == -1){
1960
perror_plus("klogctl");
1961
}
1962
}
1963
#endif /* __linux__ */
1964
exitcode = EX_OSERR;
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1971
goto end;
1972
}
1973
if((network.ifr_flags & IFF_UP) == 0){
1974
network.ifr_flags |= IFF_UP;
1975
take_down_interface = true;
1976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1977
if(ret == -1){
1978
take_down_interface = false;
1979
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1980
exitcode = EX_OSERR;
1981
#ifdef __linux__
1982
if(restore_loglevel){
1983
ret = klogctl(7, NULL, 0);
1984
if(ret == -1){
1985
perror_plus("klogctl");
1986
}
1987
}
1988
#endif /* __linux__ */
1989
/* Lower privileges */
1990
errno = 0;
1991
ret = seteuid(uid);
1992
if(ret == -1){
1993
perror_plus("seteuid");
1994
}
1995
goto end;
1996
}
1997
}
1998
/* Sleep checking until interface is running.
1999
Check every 0.25s, up to total time of delay */
2000
for(int i=0; i < delay * 4; i++){
2001
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2002
if(ret == -1){
2003
perror_plus("ioctl SIOCGIFFLAGS");
2004
} else if(network.ifr_flags & IFF_RUNNING){
2005
break;
2006
}
2007
struct timespec sleeptime = { .tv_nsec = 250000000 };
2008
ret = nanosleep(&sleeptime, NULL);
2009
if(ret == -1 and errno != EINTR){
2010
perror_plus("nanosleep");
2011
}
2012
}
2013
if(not take_down_interface){
2014
/* We won't need the socket anymore */
2015
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2016
if(ret == -1){
2017
perror_plus("close");
2018
}
2019
}
2020
#ifdef __linux__
2021
if(restore_loglevel){
2022
/* Restores kernel loglevel to default */
2023
ret = klogctl(7, NULL, 0);
2024
if(ret == -1){
2025
perror_plus("klogctl");
2026
}
2027
}
2028
#endif /* __linux__ */
2029
/* Lower privileges */
2030
errno = 0;
2031
/* Lower privileges */
2032
ret = seteuid(uid);
2033
if(ret == -1){
2034
perror_plus("seteuid");
2119
/* If no interfaces were specified, make a list */
2120
if(interfaces == NULL){
2121
struct dirent **direntries;
2122
/* Look for any good interfaces */
2123
ret = scandir(sys_class_net, &direntries, good_interface,
2124
alphasort);
2125
if(ret >= 1){
2126
/* Add all found interfaces to interfaces list */
2127
for(int i = 0; i < ret; ++i){
2128
ret_errno = argz_add(&interfaces, &interfaces_size,
2129
direntries[i]->d_name);
2130
if(ret_errno != 0){
2131
perror_plus("argz_add");
2132
continue;
2133
}
2134
if(debug){
2135
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2136
direntries[i]->d_name);
2137
}
2138
}
2139
free(direntries);
2140
} else {
2141
free(direntries);
2142
fprintf_plus(stderr, "Could not find a network interface\n");
2143
exitcode = EXIT_FAILURE;
2144
goto end;
2145
}
2146
}
2147
2148
/* If we only got one interface, explicitly use only that one */
2149
if(argz_count(interfaces, interfaces_size) == 1){
2150
if(debug){
2151
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2152
interfaces);
2153
}
2154
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2155
}
2156
2157
/* Bring up interfaces which are down */
2158
if(not (argz_count(interfaces, interfaces_size) == 1
2159
and strcmp(interfaces, "none") == 0)){
2160
char *interface = NULL;
2161
while((interface = argz_next(interfaces, interfaces_size,
2162
interface))){
2163
bool interface_was_up = interface_is_up(interface);
2164
ret = bring_up_interface(interface, delay);
2165
if(not interface_was_up){
2166
if(ret != 0){
2167
errno = ret;
2168
perror_plus("Failed to bring up interface");
2169
} else {
2170
ret_errno = argz_add(&interfaces_to_take_down,
2171
&interfaces_to_take_down_size,
2172
interface);
2173
}
2174
}
2175
}
2176
free(interfaces);
2177
interfaces = NULL;
2178
interfaces_size = 0;
2179
if(debug and (interfaces_to_take_down == NULL)){
2180
fprintf_plus(stderr, "No interfaces were brought up\n");
2035
2181
}
2036
2182
}
2037
2183
2078
2224
/* Connect directly, do not use Zeroconf */
2079
2225
/* (Mainly meant for debugging) */
2080
2226
char *address = strrchr(connect_to, ':');
2227
2081
2228
if(address == NULL){
2082
2229
fprintf_plus(stderr, "No colon in address\n");
2083
2230
exitcode = EX_USAGE;
2088
2235
goto end;
2089
2236
}
2090
2237
2091
uint16_t port;
2238
in_port_t port;
2092
2239
errno = 0;
2093
2240
tmpmax = strtoimax(address+1, &tmp, 10);
2094
2241
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2095
or tmpmax != (uint16_t)tmpmax){
2242
or tmpmax != (in_port_t)tmpmax){
2096
2243
fprintf_plus(stderr, "Bad port number\n");
2097
2244
exitcode = EX_USAGE;
2098
2245
goto end;
2102
2249
goto end;
2103
2250
}
2104
2251
2105
port = (uint16_t)tmpmax;
2252
port = (in_port_t)tmpmax;
2106
2253
*address = '\0';
2107
2254
/* Colon in address indicates IPv6 */
2108
2255
int af;
2156
2303
config.publish_domain = 0;
2157
2304
2158
2305
/* Allocate a new server */
2159
mc.server = avahi_server_new(avahi_simple_poll_get
2160
(mc.simple_poll), &config, NULL,
2161
NULL, &error);
2306
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2307
&config, NULL, NULL, &ret_errno);
2162
2308
2163
2309
/* Free the Avahi configuration data */
2164
2310
avahi_server_config_free(&config);
2167
2313
/* Check if creating the Avahi server object succeeded */
2168
2314
if(mc.server == NULL){
2169
2315
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2170
avahi_strerror(error));
2316
avahi_strerror(ret_errno));
2171
2317
exitcode = EX_UNAVAILABLE;
2172
2318
goto end;
2173
2319
}
2197
2343
fprintf_plus(stderr, "Starting Avahi loop search\n");
2198
2344
}
2199
2345
2200
ret = avahi_loop_with_timeout(mc.simple_poll,
2346
ret = avahi_loop_with_timeout(simple_poll,
2201
2347
(int)(retry_interval * 1000));
2202
2348
if(debug){
2203
2349
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2217
2363
if(mc.server != NULL)
2218
2364
avahi_server_free(mc.server);
2219
2365
2220
if(mc.simple_poll != NULL)
2221
avahi_simple_poll_free(mc.simple_poll);
2366
if(simple_poll != NULL)
2367
avahi_simple_poll_free(simple_poll);
2222
2368
2223
2369
if(gnutls_initialized){
2224
2370
gnutls_certificate_free_credentials(mc.cred);
2241
2387
}
2242
2388
}
2243
2389
2244
/* Run network hooks */
2245
run_network_hooks("stop", interface, delay);
2246
2247
2390
/* Re-raise priviliges */
2248
2391
{
2249
errno = 0;
2250
ret = seteuid(0);
2251
if(ret == -1){
2252
perror_plus("seteuid");
2253
}
2254
2255
/* Take down the network interface */
2256
if(take_down_interface and geteuid() == 0){
2257
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2258
if(ret == -1){
2259
perror_plus("ioctl SIOCGIFFLAGS");
2260
} else if(network.ifr_flags & IFF_UP){
2261
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2262
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2263
if(ret == -1){
2264
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2392
raise_privileges();
2393
2394
/* Run network hooks */
2395
run_network_hooks("stop", interfaces_hooks != NULL ?
2396
interfaces_hooks : "", delay);
2397
2398
/* Take down the network interfaces which were brought up */
2399
{
2400
char *interface = NULL;
2401
while((interface=argz_next(interfaces_to_take_down,
2402
interfaces_to_take_down_size,
2403
interface))){
2404
ret_errno = take_down_interface(interface);
2405
if(ret_errno != 0){
2406
errno = ret_errno;
2407
perror_plus("Failed to take down interface");
2265
2408
}
2266
2409
}
2267
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2268
if(ret == -1){
2269
perror_plus("close");
2410
if(debug and (interfaces_to_take_down == NULL)){
2411
fprintf_plus(stderr, "No interfaces needed to be taken"
2412
" down\n");
2270
2413
}
2271
2414
}
2272
}
2273
/* Lower privileges permanently */
2274
errno = 0;
2275
ret = setuid(uid);
2276
if(ret == -1){
2277
perror_plus("setuid");
2278
}
2415
2416
lower_privileges_permanently();
2417
}
2418
2419
free(interfaces_to_take_down);
2420
free(interfaces_hooks);
2279
2421
2280
2422
/* Removes the GPGME temp directory and all files inside */
2281
2423
if(tempdir_created){
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0