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- Committer: teddy at bsnet
- Date: 2010-09-09 18:16:14 UTC
- mfrom: (237.2.35 mandos-empty-device)
- Revision ID: teddy@fukt.bsnet.se-20100909181614-oanlmvkzsiodbo3c
Merge in branch to interpret an empty device name to mean
"autodetect".
"autodetect".
added
removed
plugins.d/mandos-client.c
127
127
static const char mandos_protocol_version[] = "1";
128
128
const char *argp_program_version = "mandos-client " VERSION;
129
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
130
132
131
133
/* Used for passing in values through the Avahi callback functions */
132
134
typedef struct {
1020
1022
errno = old_errno;
1021
1023
}
1022
1024
1025
/*
1026
* This function determines if a directory entry in /sys/class/net
1027
* corresponds to an acceptable network device.
1028
* (This function is passed to scandir(3) as a filter function.)
1029
*/
1030
int good_interface(const struct dirent *if_entry){
1031
ssize_t ssret;
1032
char *flagname = NULL;
1033
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1034
if_entry->d_name);
1035
if(ret < 0){
1036
perror("asprintf");
1037
return 0;
1038
}
1039
if(if_entry->d_name[0] == '.'){
1040
return 0;
1041
}
1042
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1043
if(flags_fd == -1){
1044
perror("open");
1045
return 0;
1046
}
1047
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1048
/* read line from flags_fd */
1049
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1050
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1051
flagstring[(size_t)to_read] = '\0';
1052
if(flagstring == NULL){
1053
perror("malloc");
1054
close(flags_fd);
1055
return 0;
1056
}
1057
while(to_read > 0){
1058
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1059
(size_t)to_read));
1060
if(ssret == -1){
1061
perror("read");
1062
free(flagstring);
1063
close(flags_fd);
1064
return 0;
1065
}
1066
to_read -= ssret;
1067
if(ssret == 0){
1068
break;
1069
}
1070
}
1071
close(flags_fd);
1072
intmax_t tmpmax;
1073
char *tmp;
1074
errno = 0;
1075
tmpmax = strtoimax(flagstring, &tmp, 0);
1076
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1077
and not (isspace(*tmp)))
1078
or tmpmax != (ifreq_flags)tmpmax){
1079
if(debug){
1080
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1081
flagstring, if_entry->d_name);
1082
}
1083
free(flagstring);
1084
return 0;
1085
}
1086
free(flagstring);
1087
ifreq_flags flags = (ifreq_flags)tmpmax;
1088
/* Reject the loopback device */
1089
if(flags & IFF_LOOPBACK){
1090
if(debug){
1091
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1092
if_entry->d_name);
1093
}
1094
return 0;
1095
}
1096
/* Accept point-to-point devices only if connect_to is specified */
1097
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1098
if(debug){
1099
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1100
if_entry->d_name);
1101
}
1102
return 1;
1103
}
1104
/* Otherwise, reject non-broadcast-capable devices */
1105
if(not (flags & IFF_BROADCAST)){
1106
if(debug){
1107
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1108
if_entry->d_name);
1109
}
1110
return 0;
1111
}
1112
/* Accept this device */
1113
if(debug){
1114
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1115
if_entry->d_name);
1116
}
1117
return 1;
1118
}
1119
1023
1120
int main(int argc, char *argv[]){
1024
1121
AvahiSServiceBrowser *sb = NULL;
1025
1122
int error;
1027
1124
intmax_t tmpmax;
1028
1125
char *tmp;
1029
1126
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1127
const char *interface = "";
1031
1128
struct ifreq network;
1032
1129
int sd = -1;
1033
1130
bool take_down_interface = false;
1034
1131
uid_t uid;
1035
1132
gid_t gid;
1036
char *connect_to = NULL;
1037
1133
char tempdir[] = "/tmp/mandosXXXXXX";
1038
1134
bool tempdir_created = false;
1039
1135
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1196
1292
if(not debug){
1197
1293
avahi_set_log_function(empty_log);
1198
1294
}
1295
1296
if(interface[0] == '\0'){
1297
struct dirent **direntries;
1298
ret = scandir(sys_class_net, &direntries, good_interface,
1299
alphasort);
1300
if(ret >= 1){
1301
/* Pick the first good interface */
1302
interface = strdup(direntries[0]->d_name);
1303
if(debug){
1304
fprintf(stderr, "Using interface \"%s\"\n", interface);
1305
}
1306
if(interface == NULL){
1307
perror("malloc");
1308
free(direntries);
1309
exitcode = EXIT_FAILURE;
1310
goto end;
1311
}
1312
free(direntries);
1313
} else {
1314
free(direntries);
1315
fprintf(stderr, "Could not find a network interface\n");
1316
exitcode = EXIT_FAILURE;
1317
goto end;
1318
}
1319
}
1199
1320
1200
1321
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
1322
from the signal handler */
1272
1393
}
1273
1394
1274
1395
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
1396
if(strcmp(interface, "none") != 0){
1276
1397
if_index = (AvahiIfIndex) if_nametoindex(interface);
1277
1398
if(if_index == 0){
1278
1399
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1349
1470
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
1471
if(ret == -1){
1351
1472
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1473
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1353
1474
exitcode = EX_OSERR;
1354
1475
#ifdef __linux__
1355
1476
if(restore_loglevel){
1624
1745
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
1746
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
1747
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1748
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1628
1749
}
1629
1750
}
1630
1751
ret = (int)TEMP_FAILURE_RETRY(close(sd));
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