166
152
const char *priority;
168
154
server *current_server;
170
size_t interfaces_size;
171
155
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
176
163
sig_atomic_t quit_now = 0;
177
164
int signal_received = 0;
179
166
/* Function to use when printing errors */
180
167
void perror_plus(const char *print_text){
182
168
fprintf(stderr, "Mandos plugin %s: ",
183
169
program_invocation_short_name);
185
170
perror(print_text);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
175
* bytes. "buffer_capacity" is how much is currently allocated,
201
176
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
178
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
179
size_t buffer_capacity){
206
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
185
buffer_capacity += BUFFER_SIZE;
218
187
return buffer_capacity;
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
226
194
server *new_server = malloc(sizeof(server));
227
195
if(new_server == NULL){
228
196
perror_plus("malloc");
231
199
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
201
.if_index = if_index,
235
203
if(new_server->ip == NULL){
236
204
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
/* Special case of first server */
255
if(*current_server == NULL){
207
/* unique case of first server */
208
if (mc.current_server == NULL){
256
209
new_server->next = new_server;
257
210
new_server->prev = new_server;
258
*current_server = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
263
216
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
217
mc.current_server->prev = new_server;
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
perror_plus("clock_gettime");
270
228
* Initialize GPGME.
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
277
232
gpgme_error_t rc;
278
233
gpgme_engine_info_t engine_info;
281
237
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
239
bool import_key(const char *filename){
286
242
gpgme_data_t pgp_data;
379
331
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
385
337
/* Create new GPGME data buffer from memory cryptotext */
386
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
340
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
394
346
/* Create new empty GPGME data buffer for the plaintext */
395
347
rc = gpgme_data_new(&dh_plain);
396
348
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
400
351
gpgme_data_release(dh_crypto);
404
355
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
358
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
410
361
plaintext_length = -1;
412
363
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
364
result = gpgme_op_decrypt_result(mc.ctx);
414
365
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
421
372
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
373
fprintf(stderr, "File name: %s\n", result->file_name);
424
375
gpgme_recipient_t recipient;
425
376
recipient = result->recipients;
426
377
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
434
384
recipient = recipient->next;
536
483
/* OpenPGP credentials */
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
538
485
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
541
488
gnutls_global_deinit();
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
552
498
ret = gnutls_certificate_set_openpgp_key_file
553
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
554
500
GNUTLS_OPENPGP_FMT_BASE64);
555
501
if(ret != GNUTLS_E_SUCCESS){
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
564
510
/* GnuTLS server initialization */
565
ret = gnutls_dh_params_init(&mc->dh_params);
511
ret = gnutls_dh_params_init(&mc.dh_params);
566
512
if(ret != GNUTLS_E_SUCCESS){
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
573
518
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
585
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
586
531
gnutls_global_deinit();
587
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
536
static int init_gnutls_session(gnutls_session_t *session){
595
538
/* GnuTLS session creation */
790
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
709
perror_plus("if_indextoname");
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
800
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
802
721
if(af == AF_INET6){
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
729
perror_plus("inet_ntop");
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
1187
1078
signal_received = sig;
1188
1079
int old_errno = errno;
1189
1080
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1193
1084
errno = old_errno;
1196
__attribute__((nonnull, warn_unused_result))
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1204
perror_plus("socket");
1208
strcpy(ifr->ifr_name, ifname);
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1092
int good_interface(const struct dirent *if_entry){
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1101
perror_plus("asprintf");
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
perror_plus("open");
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1125
perror_plus("read");
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1213
perror_plus("ioctl SIOCGIFFLAGS");
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1221
__attribute__((nonnull, warn_unused_result))
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1224
1152
/* Reject the loopback device */
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1153
if(flags & IFF_LOOPBACK){
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1232
1160
/* Accept point-to-point devices only if connect_to is specified */
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1240
1168
/* Otherwise, reject non-broadcast-capable devices */
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1169
if(not (flags & IFF_BROADCAST)){
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1248
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1249
if(ifr->ifr_flags & IFF_NOARP){
1177
if(flags & IFF_NOARP){
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1257
1184
/* Accept this device */
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1265
* This function determines if a directory entry in /sys/class/net
1266
* corresponds to an acceptable network device.
1267
* (This function is passed to scandir(3) as a filter function.)
1269
__attribute__((nonnull, warn_unused_result))
1270
int good_interface(const struct dirent *if_entry){
1271
if(if_entry->d_name[0] == '.'){
1276
if(not get_flags(if_entry->d_name, &ifr)){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1284
if(not good_flags(if_entry->d_name, &ifr)){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1291
* This function determines if a network interface is up.
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1296
if(not get_flags(interface, &ifr)){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1308
* This function determines if a network interface is running
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1313
if(not get_flags(interface, &ifr)){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1324
__attribute__((nonnull, pure, warn_unused_result))
1325
1192
int notdotentries(const struct dirent *direntry){
1326
1193
/* Skip "." and ".." */
1327
1194
if(direntry->d_name[0] == '.'
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
int runnable_hook(const struct dirent *direntry){
1343
if((direntry->d_name)[0] == '\0'){
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
"abcdefghijklmnopqrstuvwxyz"
1352
if((direntry->d_name)[sret] != '\0'){
1353
/* Contains non-allowed characters */
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1364
perror_plus("Could not stat hook");
1368
if(not (S_ISREG(st.st_mode))){
1369
/* Not a regular file */
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1377
/* Not executable */
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1395
1205
struct timespec now;
1396
1206
struct timespec waited_time;
1397
1207
intmax_t block_time;
1400
if(mc->current_server == NULL){
1402
fprintf_plus(stderr, "Wait until first server is found."
1210
if(mc.current_server == NULL){
1213
"Wait until first server is found. No timeout!\n");
1405
1215
ret = avahi_simple_poll_iterate(s, -1);
1408
fprintf_plus(stderr, "Check current_server if we should run"
1218
fprintf(stderr, "Check current_server if we should run it,"
1411
1221
/* the current time */
1412
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1417
1227
/* Calculating in ms how long time between now and server
1418
1228
who we visted longest time ago. Now - last seen. */
1419
1229
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1230
- mc.current_server->last_seen.tv_sec);
1421
1231
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1232
- mc.current_server->last_seen.tv_nsec);
1423
1233
/* total time is 10s/10,000ms.
1424
1234
Converting to s from ms by dividing by 1,000,
1425
1235
and ns to ms by dividing by 1,000,000. */
1426
1236
block_time = ((retry_interval
1427
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1428
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1435
1244
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1441
avahi_simple_poll_quit(s);
1250
avahi_simple_poll_quit(mc.simple_poll);
1444
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1254
&mc.current_server->last_seen);
1447
1256
perror_plus("clock_gettime");
1450
mc->current_server = mc->current_server->next;
1259
mc.current_server = mc.current_server->next;
1451
1260
block_time = 0; /* Call avahi to find new Mandos
1452
1261
servers, but don't block */
1455
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1458
if(ret > 0 or errno != EINTR){
1267
if (ret > 0 or errno != EINTR) {
1459
1268
return (ret != 1) ? ret : 0;
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1486
if(setuid(0) == -1){
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1530
perror_plus("open");
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1546
#endif /* not __GLIBC__ */
1548
perror_plus("scandir");
1551
struct dirent *direntry;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1560
pid_t hook_pid = fork();
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1566
perror_plus("Failed to raise privileges");
1573
perror_plus("setgid");
1576
/* Reset supplementary groups */
1578
ret = setgroups(0, NULL);
1580
perror_plus("setgroups");
1583
ret = dup2(devnull, STDIN_FILENO);
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1588
ret = close(devnull);
1590
perror_plus("close");
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1600
perror_plus("setenv");
1603
ret = setenv("DEVICE", interface, 1);
1605
perror_plus("setenv");
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1610
perror_plus("setenv");
1613
ret = setenv("MODE", mode, 1);
1615
perror_plus("setenv");
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1621
perror_plus("asprintf");
1624
ret = setenv("DELAY", delaystring, 1);
1627
perror_plus("setenv");
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1634
perror_plus("setenv");
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1654
perror_plus("fork");
1659
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1660
perror_plus("waitpid");
1664
if(WIFEXITED(status)){
1665
if(WEXITSTATUS(status) != 0){
1666
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1667
" with status %d\n", direntry->d_name,
1668
WEXITSTATUS(status));
1672
} else if(WIFSIGNALED(status)){
1673
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1674
" signal %d\n", direntry->d_name,
1679
fprintf_plus(stderr, "Warning: network hook \"%s\""
1680
" crashed\n", direntry->d_name);
1686
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1692
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1693
perror_plus("close");
1700
__attribute__((nonnull, warn_unused_result))
1701
error_t bring_up_interface(const char *const interface,
1703
error_t old_errno = errno;
1705
struct ifreq network;
1706
unsigned int if_index = if_nametoindex(interface);
1708
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1718
if(not interface_is_up(interface)){
1719
error_t ret_errno = 0, ioctl_errno = 0;
1720
if(not get_flags(interface, &network)){
1722
fprintf_plus(stderr, "Failed to get flags for interface "
1723
"\"%s\"\n", interface);
1727
network.ifr_flags |= IFF_UP; /* set flag */
1729
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1732
perror_plus("socket");
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1740
perror_plus("close");
1747
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1751
/* Raise privileges */
1752
ret_errno = raise_privileges();
1755
perror_plus("Failed to raise privileges");
1760
bool restore_loglevel = false;
1762
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1763
messages about the network interface to mess up the prompt */
1764
ret_linux = klogctl(8, NULL, 5);
1765
if(ret_linux == -1){
1766
perror_plus("klogctl");
1768
restore_loglevel = true;
1771
#endif /* __linux__ */
1772
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1773
ioctl_errno = errno;
1775
if(restore_loglevel){
1776
ret_linux = klogctl(7, NULL, 0);
1777
if(ret_linux == -1){
1778
perror_plus("klogctl");
1781
#endif /* __linux__ */
1783
/* If raise_privileges() succeeded above */
1785
/* Lower privileges */
1786
ret_errno = lower_privileges();
1789
perror_plus("Failed to lower privileges");
1793
/* Close the socket */
1794
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1796
perror_plus("close");
1799
if(ret_setflags == -1){
1800
errno = ioctl_errno;
1801
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1806
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1810
/* Sleep checking until interface is running.
1811
Check every 0.25s, up to total time of delay */
1812
for(int i=0; i < delay * 4; i++){
1813
if(interface_is_running(interface)){
1816
struct timespec sleeptime = { .tv_nsec = 250000000 };
1817
ret = nanosleep(&sleeptime, NULL);
1818
if(ret == -1 and errno != EINTR){
1819
perror_plus("nanosleep");
1827
__attribute__((nonnull, warn_unused_result))
1828
error_t take_down_interface(const char *const interface){
1829
error_t old_errno = errno;
1830
struct ifreq network;
1831
unsigned int if_index = if_nametoindex(interface);
1833
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1837
if(interface_is_up(interface)){
1838
error_t ret_errno = 0, ioctl_errno = 0;
1839
if(not get_flags(interface, &network) and debug){
1841
fprintf_plus(stderr, "Failed to get flags for interface "
1842
"\"%s\"\n", interface);
1846
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1848
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1851
perror_plus("socket");
1857
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1861
/* Raise privileges */
1862
ret_errno = raise_privileges();
1865
perror_plus("Failed to raise privileges");
1868
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1869
ioctl_errno = errno;
1871
/* If raise_privileges() succeeded above */
1873
/* Lower privileges */
1874
ret_errno = lower_privileges();
1877
perror_plus("Failed to lower privileges");
1881
/* Close the socket */
1882
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1884
perror_plus("close");
1887
if(ret_setflags == -1){
1888
errno = ioctl_errno;
1889
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1894
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1902
1274
int main(int argc, char *argv[]){
1903
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1904
.priority = "SECURE256:!CTYPE-X.509:"
1905
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
1906
.interfaces = NULL, .interfaces_size = 0 };
1907
1275
AvahiSServiceBrowser *sb = NULL;
1910
1278
intmax_t tmpmax;
1912
1280
int exitcode = EXIT_SUCCESS;
1913
char *interfaces_to_take_down = NULL;
1914
size_t interfaces_to_take_down_size = 0;
1915
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1916
char old_tempdir[] = "/tmp/mandosXXXXXX";
1917
char *tempdir = NULL;
1281
const char *interface = "";
1282
struct ifreq network;
1284
bool take_down_interface = false;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
1918
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1919
1290
const char *seckey = PATHDIR "/" SECKEY;
1920
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1921
char *interfaces_hooks = NULL;
1923
1293
bool gnutls_initialized = false;
1924
1294
bool gpgme_initialized = false;
2102
1460
/* Work around Debian bug #633582:
2103
1461
<http://bugs.debian.org/633582> */
2105
/* Re-raise privileges */
2106
ret_errno = raise_privileges();
2109
perror_plus("Failed to raise privileges");
2113
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2114
int seckey_fd = open(seckey, O_RDONLY);
2115
if(seckey_fd == -1){
2116
perror_plus("open");
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2120
perror_plus("fstat");
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(seckey_fd, uid, gid);
2126
perror_plus("fchown");
2130
TEMP_FAILURE_RETRY(close(seckey_fd));
2134
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2135
int pubkey_fd = open(pubkey, O_RDONLY);
2136
if(pubkey_fd == -1){
2137
perror_plus("open");
2139
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2141
perror_plus("fstat");
2143
if(S_ISREG(st.st_mode)
2144
and st.st_uid == 0 and st.st_gid == 0){
2145
ret = fchown(pubkey_fd, uid, gid);
2147
perror_plus("fchown");
2151
TEMP_FAILURE_RETRY(close(pubkey_fd));
2155
/* Lower privileges */
2156
ret_errno = lower_privileges();
2159
perror_plus("Failed to lower privileges");
2164
/* Remove invalid interface names (except "none") */
2166
char *interface = NULL;
2167
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2169
if(strcmp(interface, "none") != 0
2170
and if_nametoindex(interface) == 0){
2171
if(interface[0] != '\0'){
2172
fprintf_plus(stderr, "Not using nonexisting interface"
2173
" \"%s\"\n", interface);
2175
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2181
/* Run network hooks */
2183
if(mc.interfaces != NULL){
2184
interfaces_hooks = malloc(mc.interfaces_size);
2185
if(interfaces_hooks == NULL){
2186
perror_plus("malloc");
2189
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2190
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2192
run_network_hooks("start", interfaces_hooks != NULL ?
2193
interfaces_hooks : "", delay);
1464
/* Re-raise priviliges */
1468
perror_plus("seteuid");
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1477
perror_plus("fstat");
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1482
perror_plus("fchown");
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1495
perror_plus("fstat");
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1500
perror_plus("fchown");
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1507
/* Lower privileges */
1511
perror_plus("seteuid");
2197
1516
avahi_set_log_function(empty_log);
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1529
if(interface == NULL){
1530
perror_plus("malloc");
1532
exitcode = EXIT_FAILURE;
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
2200
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2201
1545
from the signal handler */
2202
1546
/* Initialize the pseudo-RNG for Avahi */
2203
1547
srand((unsigned int) time(NULL));
2204
simple_poll = avahi_simple_poll_new();
2205
if(simple_poll == NULL){
2206
fprintf_plus(stderr,
2207
"Avahi: Failed to create simple poll object.\n");
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2208
1551
exitcode = EX_UNAVAILABLE;
2275
/* If no interfaces were specified, make a list */
2276
if(mc.interfaces == NULL){
2277
struct dirent **direntries = NULL;
2278
/* Look for any good interfaces */
2279
ret = scandir(sys_class_net, &direntries, good_interface,
2282
/* Add all found interfaces to interfaces list */
2283
for(int i = 0; i < ret; ++i){
2284
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2285
direntries[i]->d_name);
2288
perror_plus("argz_add");
2289
free(direntries[i]);
2293
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2294
direntries[i]->d_name);
2296
free(direntries[i]);
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1631
/* Re-raise priviliges */
1635
perror_plus("seteuid");
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1647
#endif /* __linux__ */
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1657
perror_plus("klogctl");
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1665
perror_plus("seteuid");
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1672
perror_plus("ioctl SIOCGIFFLAGS");
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1677
perror_plus("klogctl");
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1686
perror_plus("seteuid");
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1702
perror_plus("klogctl");
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1710
perror_plus("seteuid");
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
perror_plus("close");
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1742
perror_plus("klogctl");
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1748
if(take_down_interface){
1749
/* Lower privileges */
1752
perror_plus("seteuid");
2303
fprintf_plus(stderr, "Could not find a network interface\n");
2304
exitcode = EXIT_FAILURE;
2309
/* Bring up interfaces which are down, and remove any "none"s */
2311
char *interface = NULL;
2312
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2314
/* If interface name is "none", stop bringing up interfaces.
2315
Also remove all instances of "none" from the list */
2316
if(strcmp(interface, "none") == 0){
2317
argz_delete(&mc.interfaces, &mc.interfaces_size,
2320
while((interface = argz_next(mc.interfaces,
2321
mc.interfaces_size, interface))){
2322
if(strcmp(interface, "none") == 0){
2323
argz_delete(&mc.interfaces, &mc.interfaces_size,
2330
bool interface_was_up = interface_is_up(interface);
2331
errno = bring_up_interface(interface, delay);
2332
if(not interface_was_up){
2334
perror_plus("Failed to bring up interface");
2336
errno = argz_add(&interfaces_to_take_down,
2337
&interfaces_to_take_down_size,
2340
perror_plus("argz_add");
2345
if(debug and (interfaces_to_take_down == NULL)){
2346
fprintf_plus(stderr, "No interfaces were brought up\n");
2350
/* If we only got one interface, explicitly use only that one */
2351
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2353
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2356
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1755
/* Lower privileges permanently */
1758
perror_plus("setuid");
2363
ret = init_gnutls_global(pubkey, seckey, &mc);
1767
ret = init_gnutls_global(pubkey, seckey);
2365
fprintf_plus(stderr, "init_gnutls_global failed\n");
1769
fprintf(stderr, "init_gnutls_global failed\n");
2366
1770
exitcode = EX_UNAVAILABLE;
2562
1944
if(gpgme_initialized){
2563
1945
gpgme_release(mc.ctx);
2566
1948
/* Cleans up the circular linked list of Mandos servers the client
2568
1950
if(mc.current_server != NULL){
2569
1951
mc.current_server->prev->next = NULL;
2570
1952
while(mc.current_server != NULL){
2571
1953
server *next = mc.current_server->next;
2573
#pragma GCC diagnostic push
2574
#pragma GCC diagnostic ignored "-Wcast-qual"
2576
free((char *)(mc.current_server->ip));
2578
#pragma GCC diagnostic pop
2580
1954
free(mc.current_server);
2581
1955
mc.current_server = next;
2585
/* Re-raise privileges */
2587
ret_errno = raise_privileges();
2590
perror_plus("Failed to raise privileges");
2593
/* Run network hooks */
2594
run_network_hooks("stop", interfaces_hooks != NULL ?
2595
interfaces_hooks : "", delay);
2597
/* Take down the network interfaces which were brought up */
2599
char *interface = NULL;
2600
while((interface=argz_next(interfaces_to_take_down,
2601
interfaces_to_take_down_size,
2603
ret_errno = take_down_interface(interface);
2606
perror_plus("Failed to take down interface");
2609
if(debug and (interfaces_to_take_down == NULL)){
2610
fprintf_plus(stderr, "No interfaces needed to be taken"
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1965
perror_plus("seteuid");
2616
ret_errno = lower_privileges_permanently();
2619
perror_plus("Failed to lower privileges permanently");
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1980
perror_plus("close");
1982
/* Lower privileges permanently */
1986
perror_plus("setuid");
2623
free(interfaces_to_take_down);
2624
free(interfaces_hooks);
2626
1991
/* Removes the GPGME temp directory and all files inside */
2627
if(tempdir != NULL){
1992
if(tempdir_created){
2628
1993
struct dirent **direntries = NULL;
2629
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2631
if(tempdir_fd == -1){
2632
perror_plus("open");
2635
#if __GLIBC_PREREQ(2, 15)
2636
int numentries = scandirat(tempdir_fd, ".", &direntries,
2637
notdotentries, alphasort);
2638
#else /* not __GLIBC_PREREQ(2, 15) */
2639
int numentries = scandir(tempdir, &direntries, notdotentries,
2641
#endif /* not __GLIBC_PREREQ(2, 15) */
2642
#else /* not __GLIBC__ */
2643
int numentries = scandir(tempdir, &direntries, notdotentries,
2645
#endif /* not __GLIBC__ */
2646
if(numentries >= 0){
2647
for(int i = 0; i < numentries; i++){
2648
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2650
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2651
" \"%s\", 0): %s\n", tempdir,
2652
direntries[i]->d_name, strerror(errno));
2654
free(direntries[i]);
2657
/* need to clean even if 0 because man page doesn't specify */
2659
if(numentries == -1){
2660
perror_plus("scandir");
2662
ret = rmdir(tempdir);
2663
if(ret == -1 and errno != ENOENT){
2664
perror_plus("rmdir");
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1999
char *fullname = NULL;
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2003
perror_plus("asprintf");
2006
ret = remove(fullname);
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2667
TEMP_FAILURE_RETRY(close(tempdir_fd));
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2019
perror_plus("scandir");
2021
ret = rmdir(tempdir);
2022
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");