120
133
#define PATHDIR "/conf/conf.d/mandos"
121
134
#define SECKEY "seckey.txt"
122
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
124
138
bool debug = false;
125
139
static const char mandos_protocol_version[] = "1";
126
140
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
129
160
/* Used for passing in values through the Avahi callback functions */
131
AvahiSimplePoll *simple_poll;
132
162
AvahiServer *server;
133
163
gnutls_certificate_credentials_t cred;
134
164
unsigned int dh_bits;
135
165
gnutls_dh_params_t dh_params;
136
166
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
138
171
} mandos_context;
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
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));
146
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
200
* bytes. "buffer_capacity" is how much is currently allocated,
148
201
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
150
204
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
205
size_t buffer_capacity){
152
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
157
216
buffer_capacity += BUFFER_SIZE;
159
218
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){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
perror_plus("clock_gettime");
244
/* Special case of first server */
245
if(*current_server == NULL){
246
new_server->next = new_server;
247
new_server->prev = new_server;
248
*current_server = new_server;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
253
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
163
260
* Initialize GPGME.
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
167
267
gpgme_error_t rc;
168
268
gpgme_engine_info_t engine_info;
172
271
* Helper function to insert pub and seckey to the engine keyring.
174
bool import_key(const char *filename){
273
bool import_key(const char * const filename){
177
276
gpgme_data_t pgp_data;
179
278
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
285
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
192
rc = gpgme_op_import(mc.ctx, pgp_data);
291
rc = gpgme_op_import(mc->ctx, pgp_data);
193
292
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
199
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
300
perror_plus("close");
203
302
gpgme_data_release(pgp_data);
208
fprintf(stderr, "Initializing GPGME\n");
307
fprintf_plus(stderr, "Initializing GPGME\n");
212
311
gpgme_check_version(NULL);
213
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
313
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
220
/* Set GPGME home directory for the OpenPGP engine only */
319
/* Set GPGME home directory for the OpenPGP engine only */
221
320
rc = gpgme_get_engine_info(&engine_info);
222
321
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
227
326
while(engine_info != NULL){
266
369
ssize_t plaintext_length = 0;
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
272
375
/* Create new GPGME data buffer from memory cryptotext */
273
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
275
378
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
281
384
/* Create new empty GPGME data buffer for the plaintext */
282
385
rc = gpgme_data_new(&dh_plain);
283
386
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
286
390
gpgme_data_release(dh_crypto);
290
394
/* Decrypt data from the cryptotext data buffer to the plaintext
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
397
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
296
400
plaintext_length = -1;
298
402
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
403
result = gpgme_op_decrypt_result(mc->ctx);
300
404
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
307
411
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
310
414
gpgme_recipient_t recipient;
311
415
recipient = result->recipients;
312
416
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
319
424
recipient = recipient->next;
418
526
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
527
ret = gnutls_certificate_allocate_credentials(&mc->cred);
420
528
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
safer_gnutls_strerror(ret));
529
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
530
safer_gnutls_strerror(ret));
426
531
gnutls_global_deinit();
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
536
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
537
" secret key %s as GnuTLS credentials\n",
436
542
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
543
(mc->cred, pubkeyfilename, seckeyfilename,
438
544
GNUTLS_OPENPGP_FMT_BASE64);
439
545
if(ret != GNUTLS_E_SUCCESS){
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
547
"Error[%d] while reading the OpenPGP key pair ('%s',"
548
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
549
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
550
safer_gnutls_strerror(ret));
448
554
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
555
ret = gnutls_dh_params_init(&mc->dh_params);
450
556
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
557
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
558
" initialization: %s\n",
559
safer_gnutls_strerror(ret));
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
562
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
456
563
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
564
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
565
safer_gnutls_strerror(ret));
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
468
gnutls_certificate_free_credentials(mc.cred);
575
gnutls_certificate_free_credentials(mc->cred);
469
576
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
577
gnutls_dh_params_deinit(mc->dh_params);
474
static int init_gnutls_session(gnutls_session_t *session){
581
__attribute__((nonnull, warn_unused_result))
582
static int init_gnutls_session(gnutls_session_t *session,
476
585
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
587
ret = gnutls_init(session, GNUTLS_SERVER);
591
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
478
592
if(ret != GNUTLS_E_SUCCESS){
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
594
"Error in GnuTLS session initialization: %s\n",
595
safer_gnutls_strerror(ret));
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
601
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
603
gnutls_deinit(*session);
606
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
607
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
608
fprintf_plus(stderr, "Syntax error at: %s\n", err);
609
fprintf_plus(stderr, "GnuTLS error: %s\n",
610
safer_gnutls_strerror(ret));
490
611
gnutls_deinit(*session);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
617
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
620
gnutls_deinit(*session);
623
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
497
624
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
625
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
626
safer_gnutls_strerror(ret));
500
627
gnutls_deinit(*session);
504
631
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
632
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
634
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
966
1176
signal_received = sig;
967
1177
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
1178
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1185
__attribute__((nonnull, warn_unused_result))
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1193
perror_plus("socket");
1197
strcpy(ifr->ifr_name, ifname);
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
perror_plus("ioctl SIOCGIFFLAGS");
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1213
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1221
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1229
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1246
/* Accept this device */
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1254
* This function determines if a directory entry in /sys/class/net
1255
* corresponds to an acceptable network device.
1256
* (This function is passed to scandir(3) as a filter function.)
1258
__attribute__((nonnull, warn_unused_result))
1259
int good_interface(const struct dirent *if_entry){
1260
if(if_entry->d_name[0] == '.'){
1265
if(not get_flags(if_entry->d_name, &ifr)){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1273
if(not good_flags(if_entry->d_name, &ifr)){
1280
* This function determines if a network interface is up.
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1285
if(not get_flags(interface, &ifr)){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1297
* This function determines if a network interface is running
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1302
if(not get_flags(interface, &ifr)){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
int notdotentries(const struct dirent *direntry){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
int runnable_hook(const struct dirent *direntry){
1332
if((direntry->d_name)[0] == '\0'){
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1353
perror_plus("Could not stat hook");
1357
if(not (S_ISREG(st.st_mode))){
1358
/* Not a regular file */
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
/* Not executable */
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1384
struct timespec now;
1385
struct timespec waited_time;
1386
intmax_t block_time;
1389
if(mc->current_server == NULL){
1391
fprintf_plus(stderr, "Wait until first server is found."
1394
ret = avahi_simple_poll_iterate(s, -1);
1397
fprintf_plus(stderr, "Check current_server if we should run"
1400
/* the current time */
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1403
perror_plus("clock_gettime");
1406
/* Calculating in ms how long time between now and server
1407
who we visted longest time ago. Now - last seen. */
1408
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1410
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1412
/* total time is 10s/10,000ms.
1413
Converting to s from ms by dividing by 1,000,
1414
and ns to ms by dividing by 1,000,000. */
1415
block_time = ((retry_interval
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1430
avahi_simple_poll_quit(s);
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1436
perror_plus("clock_gettime");
1439
mc->current_server = mc->current_server->next;
1440
block_time = 0; /* Call avahi to find new Mandos
1441
servers, but don't block */
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1447
if(ret > 0 or errno != EINTR){
1448
return (ret != 1) ? ret : 0;
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1461
perror_plus("seteuid");
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1476
if(setuid(0) == -1){
1478
perror_plus("seteuid");
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1491
perror_plus("seteuid");
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1504
perror_plus("setuid");
1512
* Based on the example in the GNU LibC manual chapter 13.13 "File
1513
* Descriptor Flags".
1514
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1516
__attribute__((warn_unused_result))
1517
static int set_cloexec_flag(int fd){
1518
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1519
/* If reading the flags failed, return error indication now. */
1523
/* Store modified flag word in the descriptor. */
1524
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1527
#endif /* not O_CLOEXEC */
1529
__attribute__((nonnull))
1530
void run_network_hooks(const char *mode, const char *interface,
1532
struct dirent **direntries;
1533
if(hookdir_fd == -1){
1534
hookdir_fd = open(hookdir, O_RDONLY |
1537
#else /* not O_CLOEXEC */
1539
#endif /* not O_CLOEXEC */
1541
if(hookdir_fd == -1){
1542
if(errno == ENOENT){
1544
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1545
" found\n", hookdir);
1548
perror_plus("open");
1553
if(set_cloexec_flag(hookdir_fd) < 0){
1554
perror_plus("set_cloexec_flag");
1555
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1556
perror_plus("close");
1562
#endif /* not O_CLOEXEC */
1565
#if __GLIBC_PREREQ(2, 15)
1566
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1567
runnable_hook, alphasort);
1568
#else /* not __GLIBC_PREREQ(2, 15) */
1569
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1571
#endif /* not __GLIBC_PREREQ(2, 15) */
1572
#else /* not __GLIBC__ */
1573
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1575
#endif /* not __GLIBC__ */
1577
perror_plus("scandir");
1580
struct dirent *direntry;
1582
int devnull = open("/dev/null", O_RDONLY);
1583
for(int i = 0; i < numhooks; i++){
1584
direntry = direntries[i];
1586
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1589
pid_t hook_pid = fork();
1592
/* Raise privileges */
1593
if(raise_privileges_permanently() != 0){
1594
perror_plus("Failed to raise privileges");
1601
perror_plus("setgid");
1604
/* Reset supplementary groups */
1606
ret = setgroups(0, NULL);
1608
perror_plus("setgroups");
1611
ret = dup2(devnull, STDIN_FILENO);
1613
perror_plus("dup2(devnull, STDIN_FILENO)");
1616
ret = close(devnull);
1618
perror_plus("close");
1621
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1623
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1626
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1628
perror_plus("setenv");
1631
ret = setenv("DEVICE", interface, 1);
1633
perror_plus("setenv");
1636
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1638
perror_plus("setenv");
1641
ret = setenv("MODE", mode, 1);
1643
perror_plus("setenv");
1647
ret = asprintf(&delaystring, "%f", (double)delay);
1649
perror_plus("asprintf");
1652
ret = setenv("DELAY", delaystring, 1);
1655
perror_plus("setenv");
1659
if(connect_to != NULL){
1660
ret = setenv("CONNECT", connect_to, 1);
1662
perror_plus("setenv");
1666
if(fexecve(hookdir_fd, (char *const [])
1667
{ direntry->d_name, NULL }, environ) == -1){
1668
perror_plus("fexecve");
1669
_exit(EXIT_FAILURE);
1673
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1674
perror_plus("waitpid");
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1684
} else if(WIFSIGNALED(status)){
1685
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1686
" signal %d\n", direntry->d_name,
1690
fprintf_plus(stderr, "Warning: network hook \"%s\""
1691
" crashed\n", direntry->d_name);
1696
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1700
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1701
perror_plus("close");
1708
__attribute__((nonnull, warn_unused_result))
1709
error_t bring_up_interface(const char *const interface,
1711
error_t old_errno = errno;
1713
struct ifreq network;
1714
unsigned int if_index = if_nametoindex(interface);
1716
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1726
if(not interface_is_up(interface)){
1727
error_t ret_errno = 0, ioctl_errno = 0;
1728
if(not get_flags(interface, &network)){
1730
fprintf_plus(stderr, "Failed to get flags for interface "
1731
"\"%s\"\n", interface);
1735
network.ifr_flags |= IFF_UP; /* set flag */
1737
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1740
perror_plus("socket");
1746
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1748
perror_plus("close");
1755
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1759
/* Raise privileges */
1760
ret_errno = raise_privileges();
1762
perror_plus("Failed to raise privileges");
1767
bool restore_loglevel = false;
1769
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1770
messages about the network interface to mess up the prompt */
1771
ret_linux = klogctl(8, NULL, 5);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1775
restore_loglevel = true;
1778
#endif /* __linux__ */
1779
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1780
ioctl_errno = errno;
1782
if(restore_loglevel){
1783
ret_linux = klogctl(7, NULL, 0);
1784
if(ret_linux == -1){
1785
perror_plus("klogctl");
1788
#endif /* __linux__ */
1790
/* If raise_privileges() succeeded above */
1792
/* Lower privileges */
1793
ret_errno = lower_privileges();
1796
perror_plus("Failed to lower privileges");
1800
/* Close the socket */
1801
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1803
perror_plus("close");
1806
if(ret_setflags == -1){
1807
errno = ioctl_errno;
1808
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1813
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1817
/* Sleep checking until interface is running.
1818
Check every 0.25s, up to total time of delay */
1819
for(int i=0; i < delay * 4; i++){
1820
if(interface_is_running(interface)){
1823
struct timespec sleeptime = { .tv_nsec = 250000000 };
1824
ret = nanosleep(&sleeptime, NULL);
1825
if(ret == -1 and errno != EINTR){
1826
perror_plus("nanosleep");
1834
__attribute__((nonnull, warn_unused_result))
1835
error_t take_down_interface(const char *const interface){
1836
error_t old_errno = errno;
1837
struct ifreq network;
1838
unsigned int if_index = if_nametoindex(interface);
1840
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1844
if(interface_is_up(interface)){
1845
error_t ret_errno = 0, ioctl_errno = 0;
1846
if(not get_flags(interface, &network) and debug){
1848
fprintf_plus(stderr, "Failed to get flags for interface "
1849
"\"%s\"\n", interface);
1853
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1855
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1858
perror_plus("socket");
1864
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1868
/* Raise privileges */
1869
ret_errno = raise_privileges();
1871
perror_plus("Failed to raise privileges");
1874
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1875
ioctl_errno = errno;
1877
/* If raise_privileges() succeeded above */
1879
/* Lower privileges */
1880
ret_errno = lower_privileges();
1883
perror_plus("Failed to lower privileges");
1887
/* Close the socket */
1888
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1890
perror_plus("close");
1893
if(ret_setflags == -1){
1894
errno = ioctl_errno;
1895
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1900
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
974
1908
int main(int argc, char *argv[]){
1909
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1910
.priority = "SECURE256:!CTYPE-X.509:"
1911
"+CTYPE-OPENPGP", .current_server = NULL,
1912
.interfaces = NULL, .interfaces_size = 0 };
975
1913
AvahiSServiceBrowser *sb = NULL;
978
1916
intmax_t tmpmax;
980
1918
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
982
struct ifreq network;
984
bool take_down_interface = false;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
1919
char *interfaces_to_take_down = NULL;
1920
size_t interfaces_to_take_down_size = 0;
1921
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1922
char old_tempdir[] = "/tmp/mandosXXXXXX";
1923
char *tempdir = NULL;
990
1924
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
991
1925
const char *seckey = PATHDIR "/" SECKEY;
992
1926
const char *pubkey = PATHDIR "/" PUBKEY;
1927
char *interfaces_hooks = NULL;
994
1929
bool gnutls_initialized = false;
995
1930
bool gpgme_initialized = false;
996
1931
float delay = 2.5f;
1932
double retry_interval = 10; /* 10s between trying a server and
1933
retrying the same server again */
998
struct sigaction old_sigterm_action;
1935
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
999
1936
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1941
/* Lower any group privileges we might have, just to be safe */
1945
perror_plus("setgid");
1948
/* Lower user privileges (temporarily) */
1952
perror_plus("seteuid");
1002
1960
struct argp_option options[] = {
1003
1961
{ .name = "debug", .key = 128,
1071
2050
delay = strtof(arg, &tmp);
1072
2051
if(errno != 0 or tmp == arg or *tmp != '\0'){
1073
fprintf(stderr, "Bad delay\n");
2052
argp_error(state, "Bad delay");
2054
case 132: /* --retry */
2056
retry_interval = strtod(arg, &tmp);
2057
if(errno != 0 or tmp == arg or *tmp != '\0'
2058
or (retry_interval * 1000) > INT_MAX
2059
or retry_interval < 0){
2060
argp_error(state, "Bad retry interval");
2063
case 133: /* --network-hook-dir */
2067
* These reproduce what we would get without ARGP_NO_HELP
2069
case '?': /* --help */
2070
argp_state_help(state, state->out_stream,
2071
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2072
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2073
case -3: /* --usage */
2074
argp_state_help(state, state->out_stream,
2075
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2076
case 'V': /* --version */
2077
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2078
exit(argp_err_exit_status);
1082
2081
return ARGP_ERR_UNKNOWN;
1087
2086
struct argp argp = { .options = options, .parser = parse_opt,
1088
2087
.args_doc = "",
1089
2088
.doc = "Mandos client -- Get and decrypt"
1090
2089
" passwords from a Mandos server" };
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
2090
ret = argp_parse(&argp, argc, argv,
2091
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2098
perror_plus("argp_parse");
2099
exitcode = EX_OSERR;
2102
exitcode = EX_USAGE;
2108
/* Work around Debian bug #633582:
2109
<http://bugs.debian.org/633582> */
2111
/* Re-raise privileges */
2112
ret_errno = raise_privileges();
2115
perror_plus("Failed to raise privileges");
2119
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2120
int seckey_fd = open(seckey, O_RDONLY);
2121
if(seckey_fd == -1){
2122
perror_plus("open");
2124
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2126
perror_plus("fstat");
2128
if(S_ISREG(st.st_mode)
2129
and st.st_uid == 0 and st.st_gid == 0){
2130
ret = fchown(seckey_fd, uid, gid);
2132
perror_plus("fchown");
2136
TEMP_FAILURE_RETRY(close(seckey_fd));
2140
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2141
int pubkey_fd = open(pubkey, O_RDONLY);
2142
if(pubkey_fd == -1){
2143
perror_plus("open");
2145
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2147
perror_plus("fstat");
2149
if(S_ISREG(st.st_mode)
2150
and st.st_uid == 0 and st.st_gid == 0){
2151
ret = fchown(pubkey_fd, uid, gid);
2153
perror_plus("fchown");
2157
TEMP_FAILURE_RETRY(close(pubkey_fd));
2161
/* Lower privileges */
2162
ret_errno = lower_privileges();
2165
perror_plus("Failed to lower privileges");
2170
/* Remove invalid interface names (except "none") */
2172
char *interface = NULL;
2173
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2175
if(strcmp(interface, "none") != 0
2176
and if_nametoindex(interface) == 0){
2177
if(interface[0] != '\0'){
2178
fprintf_plus(stderr, "Not using nonexisting interface"
2179
" \"%s\"\n", interface);
2181
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2187
/* Run network hooks */
2189
if(mc.interfaces != NULL){
2190
interfaces_hooks = malloc(mc.interfaces_size);
2191
if(interfaces_hooks == NULL){
2192
perror_plus("malloc");
2195
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2196
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2198
run_network_hooks("start", interfaces_hooks != NULL ?
2199
interfaces_hooks : "", delay);
1137
2241
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1139
perror("sigaction");
1140
return EXIT_FAILURE;
2243
perror_plus("sigaction");
1142
2246
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
2247
ret = sigaction(SIGINT, &sigterm_action, NULL);
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
2249
perror_plus("sigaction");
2250
exitcode = EX_OSERR;
1150
2254
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1152
perror("sigaction");
1153
return EXIT_FAILURE;
2256
perror_plus("sigaction");
1155
2259
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
2260
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
2262
perror_plus("sigaction");
2263
exitcode = EX_OSERR;
1163
2267
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2269
perror_plus("sigaction");
1168
2272
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
2273
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1196
restore_loglevel = false;
1199
#endif /* __linux__ */
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1204
exitcode = EXIT_FAILURE;
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1212
#endif /* __linux__ */
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1218
perror("ioctl SIOCGIFFLAGS");
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
2275
perror_plus("sigaction");
2276
exitcode = EX_OSERR;
2281
/* If no interfaces were specified, make a list */
2282
if(mc.interfaces == NULL){
2283
struct dirent **direntries;
2284
/* Look for any good interfaces */
2285
ret = scandir(sys_class_net, &direntries, good_interface,
2288
/* Add all found interfaces to interfaces list */
2289
for(int i = 0; i < ret; ++i){
2290
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2291
direntries[i]->d_name);
2294
perror_plus("argz_add");
2298
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2299
direntries[i]->d_name);
2305
fprintf_plus(stderr, "Could not find a network interface\n");
2306
exitcode = EXIT_FAILURE;
2311
/* Bring up interfaces which are down, and remove any "none"s */
2313
char *interface = NULL;
2314
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2316
/* If interface name is "none", stop bringing up interfaces.
2317
Also remove all instances of "none" from the list */
2318
if(strcmp(interface, "none") == 0){
2319
argz_delete(&mc.interfaces, &mc.interfaces_size,
2322
while((interface = argz_next(mc.interfaces,
2323
mc.interfaces_size, interface))){
2324
if(strcmp(interface, "none") == 0){
2325
argz_delete(&mc.interfaces, &mc.interfaces_size,
1245
#endif /* __linux__ */
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1278
#endif /* __linux__ */
1303
ret = init_gnutls_global(pubkey, seckey);
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
2332
bool interface_was_up = interface_is_up(interface);
2333
errno = bring_up_interface(interface, delay);
2334
if(not interface_was_up){
2336
perror_plus("Failed to bring up interface");
2338
errno = argz_add(&interfaces_to_take_down,
2339
&interfaces_to_take_down_size,
2342
perror_plus("argz_add");
2347
if(debug and (interfaces_to_take_down == NULL)){
2348
fprintf_plus(stderr, "No interfaces were brought up\n");
2352
/* If we only got one interface, explicitly use only that one */
2353
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2355
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2358
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2365
ret = init_gnutls_global(pubkey, seckey, &mc);
2367
fprintf_plus(stderr, "init_gnutls_global failed\n");
2368
exitcode = EX_UNAVAILABLE;
1309
2371
gnutls_initialized = true;
1471
2565
gpgme_release(mc.ctx);
1474
/* Take down the network interface */
1475
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1483
perror("ioctl SIOCSIFFLAGS");
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1492
/* Removes the temp directory used by GPGME */
1493
if(tempdir_created){
1495
struct dirent *direntry;
1496
d = opendir(tempdir);
1498
if(errno != ENOENT){
1503
direntry = readdir(d);
1504
if(direntry == NULL){
1507
/* Skip "." and ".." */
1508
if(direntry->d_name[0] == '.'
1509
and (direntry->d_name[1] == '\0'
1510
or (direntry->d_name[1] == '.'
1511
and direntry->d_name[2] == '\0'))){
1514
char *fullname = NULL;
1515
ret = asprintf(&fullname, "%s/%s", tempdir,
1521
ret = remove(fullname);
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1530
ret = rmdir(tempdir);
1531
if(ret == -1 and errno != ENOENT){
2568
/* Cleans up the circular linked list of Mandos servers the client
2570
if(mc.current_server != NULL){
2571
mc.current_server->prev->next = NULL;
2572
while(mc.current_server != NULL){
2573
server *next = mc.current_server->next;
2574
free(mc.current_server);
2575
mc.current_server = next;
2579
/* Re-raise privileges */
2581
ret_errno = raise_privileges();
2583
perror_plus("Failed to raise privileges");
2586
/* Run network hooks */
2587
run_network_hooks("stop", interfaces_hooks != NULL ?
2588
interfaces_hooks : "", delay);
2590
/* Take down the network interfaces which were brought up */
2592
char *interface = NULL;
2593
while((interface=argz_next(interfaces_to_take_down,
2594
interfaces_to_take_down_size,
2596
ret_errno = take_down_interface(interface);
2599
perror_plus("Failed to take down interface");
2602
if(debug and (interfaces_to_take_down == NULL)){
2603
fprintf_plus(stderr, "No interfaces needed to be taken"
2609
ret_errno = lower_privileges_permanently();
2611
perror_plus("Failed to lower privileges permanently");
2615
free(interfaces_to_take_down);
2616
free(interfaces_hooks);
2618
/* Removes the GPGME temp directory and all files inside */
2619
if(tempdir != NULL){
2620
struct dirent **direntries = NULL;
2621
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2622
if(tempdir_fd == -1){
2623
perror_plus("open");
2626
#if __GLIBC_PREREQ(2, 15)
2627
int numentries = scandirat(tempdir_fd, ".", &direntries,
2628
notdotentries, alphasort);
2629
#else /* not __GLIBC_PREREQ(2, 15) */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2632
#endif /* not __GLIBC_PREREQ(2, 15) */
2633
#else /* not __GLIBC__ */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2636
#endif /* not __GLIBC__ */
2638
for(int i = 0; i < numentries; i++){
2639
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2641
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2642
" \"%s\", 0): %s\n", tempdir,
2643
direntries[i]->d_name, strerror(errno));
2647
/* need to clean even if 0 because man page doesn't specify */
2649
if(numentries == -1){
2650
perror_plus("scandir");
2652
ret = rmdir(tempdir);
2653
if(ret == -1 and errno != ENOENT){
2654
perror_plus("rmdir");
2657
TEMP_FAILURE_RETRY(close(tempdir_fd));
1537
2662
sigemptyset(&old_sigterm_action.sa_mask);
1538
2663
old_sigterm_action.sa_handler = SIG_DFL;
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
2664
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2665
&old_sigterm_action,
1541
perror("sigaction");
1543
raise(signal_received);
2668
perror_plus("sigaction");
2671
ret = raise(signal_received);
2672
} while(ret != 0 and errno == EINTR);
2674
perror_plus("raise");
2677
TEMP_FAILURE_RETRY(pause());
1546
2680
return exitcode;