9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
43
43
stdout, ferror(), remove() */
44
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
48
#include <stdbool.h> /* bool, false, true */
49
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
50
strerror(), asprintf(), strcpy() */
64
64
#include <assert.h> /* assert() */
65
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
68
SIOCSIFFLAGS, if_indextoname(),
69
69
if_nametoindex(), IF_NAMESIZE */
82
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
83
sigaction(), SIGTERM, sig_atomic_t,
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#include <sys/klog.h> /* klogctl() */
975
1024
errno = old_errno;
1028
* This function determines if a directory entry in /sys/class/net
1029
* corresponds to an acceptable network device.
1030
* (This function is passed to scandir(3) as a filter function.)
1032
int good_interface(const struct dirent *if_entry){
1034
char *flagname = NULL;
1035
if(if_entry->d_name[0] == '.'){
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1116
/* Reject non-ARP interfaces (including dummy interfaces) */
1117
if(flags & IFF_NOARP){
1119
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1124
/* Accept this device */
1126
fprintf(stderr, "Interface \"%s\" is acceptable\n",
978
1132
int main(int argc, char *argv[]){
979
1133
AvahiSServiceBrowser *sb = NULL;
982
1136
intmax_t tmpmax;
984
1138
int exitcode = EXIT_SUCCESS;
985
const char *interface = "eth0";
1139
const char *interface = "";
986
1140
struct ifreq network;
988
1142
bool take_down_interface = false;
991
char *connect_to = NULL;
992
1145
char tempdir[] = "/tmp/mandosXXXXXX";
993
1146
bool tempdir_created = false;
994
1147
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1152
1305
avahi_set_log_function(empty_log);
1308
if(interface[0] == '\0'){
1309
struct dirent **direntries;
1310
ret = scandir(sys_class_net, &direntries, good_interface,
1313
/* Pick the first good interface */
1314
interface = strdup(direntries[0]->d_name);
1316
fprintf(stderr, "Using interface \"%s\"\n", interface);
1318
if(interface == NULL){
1321
exitcode = EXIT_FAILURE;
1327
fprintf(stderr, "Could not find a network interface\n");
1328
exitcode = EXIT_FAILURE;
1155
1333
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
1334
from the signal handler */
1167
1345
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1169
1347
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1348
exitcode = EX_OSERR;
1173
1351
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1175
1353
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1354
exitcode = EX_OSERR;
1179
1357
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1181
1359
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1360
exitcode = EX_OSERR;
1185
1363
/* Need to check if the handler is SIG_IGN before handling:
1189
1367
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1191
1369
perror("sigaction");
1192
return EXIT_FAILURE;
1194
1372
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
1373
ret = sigaction(SIGINT, &sigterm_action, NULL);
1197
1375
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1376
exitcode = EX_OSERR;
1202
1380
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1204
1382
perror("sigaction");
1205
return EXIT_FAILURE;
1207
1385
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
1386
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1210
1388
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1389
exitcode = EX_OSERR;
1215
1393
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1217
1395
perror("sigaction");
1218
return EXIT_FAILURE;
1220
1398
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
1399
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1223
1401
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1402
exitcode = EX_OSERR;
1229
1407
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
1408
if(strcmp(interface, "none") != 0){
1231
1409
if_index = (AvahiIfIndex) if_nametoindex(interface);
1232
1410
if(if_index == 0){
1233
1411
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1234
exitcode = EXIT_FAILURE;
1412
exitcode = EX_UNAVAILABLE;
1304
1482
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1306
1484
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1485
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1486
exitcode = EX_OSERR;
1309
1487
#ifdef __linux__
1310
1488
if(restore_loglevel){
1311
1489
ret = klogctl(7, NULL, 0);
1456
ret = start_mandos_communication(address, port, if_index, af);
1458
exitcode = EXIT_FAILURE;
1634
while(not quit_now){
1635
ret = start_mandos_communication(address, port, if_index, af);
1636
if(quit_now or ret == 0){
1460
1643
exitcode = EXIT_SUCCESS;
1561
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1562
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1564
perror("ioctl SIOCSIFFLAGS");
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1567
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));