111
51
#include <avahi-common/malloc.h>
112
52
#include <avahi-common/error.h>
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
118
init_gnutls_session(),
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
125
#include <gpgme.h> /* All GPGME types, constants and
128
GPGME_PROTOCOL_OpenPGP,
72
#include <errno.h> /* perror() */
131
75
#define BUFFER_SIZE 256
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
139
79
static const char mandos_protocol_version[] = "1";
140
const char *argp_program_version = "mandos-client " VERSION;
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;
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
160
83
/* Used for passing in values through the Avahi callback functions */
85
AvahiSimplePoll *simple_poll;
162
86
AvahiServer *server;
163
87
gnutls_certificate_credentials_t cred;
164
88
unsigned int dh_bits;
165
89
gnutls_dh_params_t dh_params;
166
90
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
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));
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
201
96
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
105
buffer_capacity += BUFFER_SIZE;
218
107
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");
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){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
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,
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
117
const char *homedir){
118
gpgme_data_t dh_crypto, dh_plain;
277
120
gpgme_error_t rc;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
278
124
gpgme_engine_info_t engine_info;
281
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
286
gpgme_data_t pgp_data;
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
310
perror_plus("close");
312
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
321
131
gpgme_check_version(NULL);
322
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
329
139
/* Set GPGME home directory for the OpenPGP engine only */
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
140
rc = gpgme_get_engine_info (&engine_info);
141
if (rc != GPG_ERR_NO_ERROR){
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
143
gpgme_strsource(rc), gpgme_strerror(rc));
336
146
while(engine_info != NULL){
337
147
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
338
148
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
339
engine_info->file_name, tempdir);
149
engine_info->file_name, homedir);
342
152
engine_info = engine_info->next;
344
154
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
if(not import_key(pubkey) or not import_key(seckey)){
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
375
gpgme_data_t dh_crypto, dh_plain;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
385
159
/* Create new GPGME data buffer from memory cryptotext */
386
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
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));
162
if (rc != GPG_ERR_NO_ERROR){
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
gpgme_strsource(rc), gpgme_strerror(rc));
394
168
/* Create new empty GPGME data buffer for the plaintext */
395
169
rc = gpgme_data_new(&dh_plain);
396
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));
170
if (rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
400
173
gpgme_data_release(dh_crypto);
177
/* Create new GPGME "context" */
178
rc = gpgme_new(&ctx);
179
if (rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
404
186
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
if (rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
410
192
plaintext_length = -1;
412
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
415
fprintf_plus(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);
421
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
201
gpgme_decrypt_result_t result;
202
result = gpgme_op_decrypt_result(ctx);
204
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
206
fprintf(stderr, "Unsupported algorithm: %s\n",
207
result->unsupported_algorithm);
208
fprintf(stderr, "Wrong key usage: %d\n",
209
result->wrong_key_usage);
210
if(result->file_name != NULL){
211
fprintf(stderr, "File name: %s\n", result->file_name);
213
gpgme_recipient_t recipient;
214
recipient = result->recipients;
426
216
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
217
fprintf(stderr, "Public key algorithm: %s\n",
218
gpgme_pubkey_algo_name(recipient->pubkey_algo));
219
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
220
fprintf(stderr, "Secret key available: %s\n",
221
recipient->status == GPG_ERR_NO_SECKEY
434
223
recipient = recipient->next;
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
445
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
448
232
plaintext_length = -1;
449
233
goto decrypt_end;
452
236
*plaintext = NULL;
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
463
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
465
249
/* Print the data, if any */
471
perror_plus("gpgme_data_read");
255
perror("gpgme_data_read");
472
256
plaintext_length = -1;
473
257
goto decrypt_end;
475
259
plaintext_length += ret;
479
fprintf_plus(stderr, "Decrypted password is: ");
263
fprintf(stderr, "Decrypted password is: ");
480
264
for(ssize_t i = 0; i < plaintext_length; i++){
481
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
650
410
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
651
411
__attribute__((unused)) const char *txt){}
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
705
/* Helper function to add_local_route() and remove_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_remove_local_route(const bool add,
709
AvahiIfIndex if_index){
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char remove_arg[] = "remove";
714
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
715
if(pluginhelperdir == NULL){
717
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
718
" variable not set; cannot run helper\n");
723
char interface[IF_NAMESIZE];
724
if(if_indextoname((unsigned int)if_index, interface) == NULL){
725
perror_plus("if_indextoname");
729
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
731
perror_plus("open(\"/dev/null\", O_RDONLY)");
737
/* Raise privileges */
738
errno = raise_privileges_permanently();
740
perror_plus("Failed to raise privileges");
741
/* _exit(EX_NOPERM); */
747
perror_plus("setgid");
750
/* Reset supplementary groups */
752
ret = setgroups(0, NULL);
754
perror_plus("setgroups");
758
ret = dup2(devnull, STDIN_FILENO);
760
perror_plus("dup2(devnull, STDIN_FILENO)");
763
ret = close(devnull);
765
perror_plus("close");
768
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
770
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
773
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
778
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
780
TEMP_FAILURE_RETRY(close(helperdir_fd));
782
#pragma GCC diagnostic push
783
#pragma GCC diagnostic ignored "-Wcast-qual"
785
if(fexecve(helper_fd, (char *const [])
786
{ helper, add ? add_arg : remove_arg, (char *)address,
787
interface, NULL }, environ) == -1){
789
#pragma GCC diagnostic pop
791
perror_plus("fexecve");
803
pret = waitpid(pid, &status, 0);
804
if(pret == -1 and errno == EINTR and quit_now){
805
int errno_raising = 0;
806
if((errno = raise_privileges()) != 0){
807
errno_raising = errno;
808
perror_plus("Failed to raise privileges in order to"
809
" kill helper program");
811
if(kill(pid, SIGTERM) == -1){
814
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
815
perror_plus("Failed to lower privileges after killing"
820
} while(pret == -1 and errno == EINTR);
822
perror_plus("waitpid");
825
if(WIFEXITED(status)){
826
if(WEXITSTATUS(status) != 0){
827
fprintf_plus(stderr, "Error: iprouteadddel exited"
828
" with status %d\n", WEXITSTATUS(status));
833
if(WIFSIGNALED(status)){
834
fprintf_plus(stderr, "Error: iprouteadddel died by"
835
" signal %d\n", WTERMSIG(status));
838
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
842
__attribute__((nonnull, warn_unused_result))
843
static bool add_local_route(const char *address,
844
AvahiIfIndex if_index){
845
return add_remove_local_route(true, address, if_index);
848
__attribute__((nonnull, warn_unused_result))
849
static bool remove_local_route(const char *address,
850
AvahiIfIndex if_index){
851
return add_remove_local_route(false, address, if_index);
854
413
/* Called when a Mandos server is found */
855
__attribute__((nonnull, warn_unused_result))
856
static int start_mandos_communication(const char *ip, in_port_t port,
414
static int start_mandos_communication(const char *ip, uint16_t port,
857
415
AvahiIfIndex if_index,
858
int af, mandos_context *mc){
859
int ret, tcp_sd = -1;
861
struct sockaddr_storage to;
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
862
419
char *buffer = NULL;
863
char *decrypted_buffer = NULL;
420
char *decrypted_buffer;
864
421
size_t buffer_length = 0;
865
422
size_t buffer_capacity = 0;
423
ssize_t decrypted_buffer_size;
426
char interface[IF_NAMESIZE];
868
427
gnutls_session_t session;
869
int pf; /* Protocol family */
870
bool route_added = false;
887
fprintf_plus(stderr, "Bad address family: %d\n", af);
892
/* If the interface is specified and we have a list of interfaces */
893
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
894
/* Check if the interface is one of the interfaces we are using */
897
char *interface = NULL;
898
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
900
if(if_nametoindex(interface) == (unsigned int)if_index){
907
/* This interface does not match any in the list, so we don't
908
connect to the server */
910
char interface[IF_NAMESIZE];
911
if(if_indextoname((unsigned int)if_index, interface) == NULL){
912
perror_plus("if_indextoname");
914
fprintf_plus(stderr, "Skipping server on non-used interface"
916
if_indextoname((unsigned int)if_index,
429
ret = init_gnutls_session (mc, &session);
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
439
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
447
perror("if_indextoname");
450
fprintf(stderr, "Binding to interface %s\n", interface);
924
ret = init_gnutls_session(&session, mc);
453
memset(&to,0,sizeof(to)); /* Spurious warning */
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
930
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
931
PRIuMAX "\n", ip, (uintmax_t)port);
934
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
937
perror_plus("socket");
947
memset(&to, 0, sizeof(to));
949
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
950
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
952
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
953
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
957
perror_plus("inet_pton");
963
fprintf_plus(stderr, "Bad address: %s\n", ip);
968
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
969
if(IN6_IS_ADDR_LINKLOCAL
970
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
971
if(if_index == AVAHI_IF_UNSPEC){
972
fprintf_plus(stderr, "An IPv6 link-local address is"
973
" incomplete without a network interface\n");
977
/* Set the network interface number as scope */
978
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
981
((struct sockaddr_in *)&to)->sin_port = htons(port);
463
fprintf(stderr, "Bad address: %s\n", ip);
466
to.in6.sin6_port = htons(port); /* Spurious warning */
468
to.in6.sin6_scope_id = (uint32_t)if_index;
990
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
991
char interface[IF_NAMESIZE];
992
if(if_indextoname((unsigned int)if_index, interface) == NULL){
993
perror_plus("if_indextoname");
995
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
996
"\n", ip, interface, (uintmax_t)port);
999
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1000
ip, (uintmax_t)port);
1002
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1003
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1005
ret = getnameinfo((struct sockaddr *)&to,
1006
sizeof(struct sockaddr_in6),
1007
addrstr, sizeof(addrstr), NULL, 0,
1010
ret = getnameinfo((struct sockaddr *)&to,
1011
sizeof(struct sockaddr_in),
1012
addrstr, sizeof(addrstr), NULL, 0,
1015
if(ret == EAI_SYSTEM){
1016
perror_plus("getnameinfo");
1017
} else if(ret != 0) {
1018
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1019
} else if(strcmp(addrstr, ip) != 0){
1020
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1031
ret = connect(tcp_sd, (struct sockaddr *)&to,
1032
sizeof(struct sockaddr_in6));
1034
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1035
sizeof(struct sockaddr_in));
1038
if(errno == ENETUNREACH
1039
and if_index != AVAHI_IF_UNSPEC
1040
and connect_to == NULL
1041
and not route_added and
1042
((af == AF_INET6 and not
1043
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1045
or (af == AF_INET and
1046
/* Not a a IPv4LL address */
1047
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1048
& 0xFFFF0000L) != 0xA9FE0000L))){
1049
/* Work around Avahi bug - Avahi does not announce link-local
1050
addresses if it has a global address, so local hosts with
1051
*only* a link-local address (e.g. Mandos clients) cannot
1052
connect to a Mandos server announced by Avahi on a server
1053
host with a global address. Work around this by retrying
1054
with an explicit route added with the server's address.
1056
Avahi bug reference:
1057
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1058
https://bugs.debian.org/587961
1061
route_added = add_local_route(ip, if_index);
1067
if(errno != ECONNREFUSED or debug){
1069
perror_plus("connect");
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
483
ret = connect(tcp_sd, &to.in, sizeof(to));
1082
489
const char *out = mandos_protocol_version;
1085
492
size_t out_size = strlen(out);
1086
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1087
out_size - written));
1090
perror_plus("write");
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
1092
498
goto mandos_end;
1094
500
written += (size_t)ret;
1095
501
if(written < out_size){
1098
if(out == mandos_protocol_version){
504
if (out == mandos_protocol_version){
1113
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1121
/* This casting via intptr_t is to eliminate warning about casting
1122
an int to a pointer type. This is exactly how the GnuTLS Guile
1123
function "set-session-transport-fd!" does it. */
1124
gnutls_transport_set_ptr(session,
1125
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1133
ret = gnutls_handshake(session);
1138
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1140
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
519
ret = gnutls_handshake (session);
521
if (ret != GNUTLS_E_SUCCESS){
1142
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1146
527
goto mandos_end;
1149
530
/* Read OpenPGP packet that contains the wanted password */
1152
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1163
buffer_capacity = incbuffer(&buffer, buffer_length,
1165
if(buffer_capacity == 0){
1167
perror_plus("incbuffer");
1177
sret = gnutls_record_recv(session, buffer+buffer_length,
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
546
ret = gnutls_record_recv(session, buffer+buffer_length,
1184
553
case GNUTLS_E_INTERRUPTED:
1185
554
case GNUTLS_E_AGAIN:
1187
556
case GNUTLS_E_REHANDSHAKE:
1189
ret = gnutls_handshake(session);
1195
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1197
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
557
ret = gnutls_handshake (session);
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1201
562
goto mandos_end;
1205
fprintf_plus(stderr, "Unknown error while reading data from"
1206
" encrypted session with Mandos server\n");
1207
gnutls_bye(session, GNUTLS_SHUT_RDWR);
566
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1209
570
goto mandos_end;
1212
buffer_length += (size_t) sret;
573
buffer_length += (size_t) ret;
1217
fprintf_plus(stderr, "Closing TLS session\n");
1226
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1231
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1233
if(buffer_length > 0){
1234
ssize_t decrypted_buffer_size;
1235
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1236
&decrypted_buffer, mc);
1237
if(decrypted_buffer_size >= 0){
578
fprintf(stderr, "Closing TLS session\n");
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
583
if (buffer_length > 0){
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
588
if (decrypted_buffer_size >= 0){
1240
590
while(written < (size_t) decrypted_buffer_size){
1246
ret = (int)fwrite(decrypted_buffer + written, 1,
1247
(size_t)decrypted_buffer_size - written,
591
ret = (int)fwrite (decrypted_buffer + written, 1,
592
(size_t)decrypted_buffer_size - written,
1249
594
if(ret == 0 and ferror(stdout)){
1252
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
596
fprintf(stderr, "Error writing encrypted data: %s\n",
1258
602
written += (size_t)ret;
604
free(decrypted_buffer);
1264
610
/* Shutdown procedure */
1269
if(not remove_local_route(ip, if_index)){
1270
fprintf_plus(stderr, "Failed to remove local route to %s on"
1271
" interface %d", ip, if_index);
1275
free(decrypted_buffer);
1278
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1284
perror_plus("close");
1286
gnutls_deinit(session);
615
gnutls_deinit (session);
1296
__attribute__((nonnull))
1297
619
static void resolve_callback(AvahiSServiceResolver *r,
1298
620
AvahiIfIndex interface,
1299
AvahiProtocol proto,
621
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1300
622
AvahiResolverEvent event,
1301
623
const char *name,
1302
624
const char *type,
1411
706
case AVAHI_BROWSER_ALL_FOR_NOW:
1412
707
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1414
fprintf_plus(stderr, "No Mandos server found, still"
709
fprintf(stderr, "No Mandos server found, still searching...\n");
1421
/* Signal handler that stops main loop after SIGTERM */
1422
static void handle_sigterm(int sig){
1427
signal_received = sig;
1428
int old_errno = errno;
1429
/* set main loop to exit */
1430
if(simple_poll != NULL){
1431
avahi_simple_poll_quit(simple_poll);
1436
__attribute__((nonnull, warn_unused_result))
1437
bool get_flags(const char *ifname, struct ifreq *ifr){
1441
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1444
perror_plus("socket");
1448
strcpy(ifr->ifr_name, ifname);
1449
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1453
perror_plus("ioctl SIOCGIFFLAGS");
1461
__attribute__((nonnull, warn_unused_result))
1462
bool good_flags(const char *ifname, const struct ifreq *ifr){
1464
/* Reject the loopback device */
1465
if(ifr->ifr_flags & IFF_LOOPBACK){
1467
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1472
/* Accept point-to-point devices only if connect_to is specified */
1473
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1475
fprintf_plus(stderr, "Accepting point-to-point interface"
1476
" \"%s\"\n", ifname);
1480
/* Otherwise, reject non-broadcast-capable devices */
1481
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1483
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1484
" \"%s\"\n", ifname);
1488
/* Reject non-ARP interfaces (including dummy interfaces) */
1489
if(ifr->ifr_flags & IFF_NOARP){
1491
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1497
/* Accept this device */
1499
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1505
* This function determines if a directory entry in /sys/class/net
1506
* corresponds to an acceptable network device.
1507
* (This function is passed to scandir(3) as a filter function.)
1509
__attribute__((nonnull, warn_unused_result))
1510
int good_interface(const struct dirent *if_entry){
1511
if(if_entry->d_name[0] == '.'){
1516
if(not get_flags(if_entry->d_name, &ifr)){
1518
fprintf_plus(stderr, "Failed to get flags for interface "
1519
"\"%s\"\n", if_entry->d_name);
1524
if(not good_flags(if_entry->d_name, &ifr)){
1531
* This function determines if a network interface is up.
1533
__attribute__((nonnull, warn_unused_result))
1534
bool interface_is_up(const char *interface){
1536
if(not get_flags(interface, &ifr)){
1538
fprintf_plus(stderr, "Failed to get flags for interface "
1539
"\"%s\"\n", interface);
1544
return (bool)(ifr.ifr_flags & IFF_UP);
1548
* This function determines if a network interface is running
1550
__attribute__((nonnull, warn_unused_result))
1551
bool interface_is_running(const char *interface){
1553
if(not get_flags(interface, &ifr)){
1555
fprintf_plus(stderr, "Failed to get flags for interface "
1556
"\"%s\"\n", interface);
1561
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1564
__attribute__((nonnull, pure, warn_unused_result))
1565
int notdotentries(const struct dirent *direntry){
1566
/* Skip "." and ".." */
1567
if(direntry->d_name[0] == '.'
1568
and (direntry->d_name[1] == '\0'
1569
or (direntry->d_name[1] == '.'
1570
and direntry->d_name[2] == '\0'))){
1576
/* Is this directory entry a runnable program? */
1577
__attribute__((nonnull, warn_unused_result))
1578
int runnable_hook(const struct dirent *direntry){
1583
if((direntry->d_name)[0] == '\0'){
1588
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1589
"abcdefghijklmnopqrstuvwxyz"
1592
if((direntry->d_name)[sret] != '\0'){
1593
/* Contains non-allowed characters */
1595
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1601
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1604
perror_plus("Could not stat hook");
1608
if(not (S_ISREG(st.st_mode))){
1609
/* Not a regular file */
1611
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1616
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1617
/* Not executable */
1619
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1625
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1631
__attribute__((nonnull, warn_unused_result))
1632
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1633
mandos_context *mc){
1635
struct timespec now;
1636
struct timespec waited_time;
1637
intmax_t block_time;
1640
if(mc->current_server == NULL){
1642
fprintf_plus(stderr, "Wait until first server is found."
1645
ret = avahi_simple_poll_iterate(s, -1);
1648
fprintf_plus(stderr, "Check current_server if we should run"
1651
/* the current time */
1652
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1654
perror_plus("clock_gettime");
1657
/* Calculating in ms how long time between now and server
1658
who we visted longest time ago. Now - last seen. */
1659
waited_time.tv_sec = (now.tv_sec
1660
- mc->current_server->last_seen.tv_sec);
1661
waited_time.tv_nsec = (now.tv_nsec
1662
- mc->current_server->last_seen.tv_nsec);
1663
/* total time is 10s/10,000ms.
1664
Converting to s from ms by dividing by 1,000,
1665
and ns to ms by dividing by 1,000,000. */
1666
block_time = ((retry_interval
1667
- ((intmax_t)waited_time.tv_sec * 1000))
1668
- ((intmax_t)waited_time.tv_nsec / 1000000));
1671
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1675
if(block_time <= 0){
1676
ret = start_mandos_communication(mc->current_server->ip,
1677
mc->current_server->port,
1678
mc->current_server->if_index,
1679
mc->current_server->af, mc);
1681
avahi_simple_poll_quit(s);
1684
ret = clock_gettime(CLOCK_MONOTONIC,
1685
&mc->current_server->last_seen);
1687
perror_plus("clock_gettime");
1690
mc->current_server = mc->current_server->next;
1691
block_time = 0; /* Call avahi to find new Mandos
1692
servers, but don't block */
1695
ret = avahi_simple_poll_iterate(s, (int)block_time);
1698
if(ret > 0 or errno != EINTR){
1699
return (ret != 1) ? ret : 0;
1705
__attribute__((nonnull))
1706
void run_network_hooks(const char *mode, const char *interface,
1708
struct dirent **direntries = NULL;
1709
if(hookdir_fd == -1){
1710
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1712
if(hookdir_fd == -1){
1713
if(errno == ENOENT){
1715
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1716
" found\n", hookdir);
1719
perror_plus("open");
1725
#if __GLIBC_PREREQ(2, 15)
1726
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1727
runnable_hook, alphasort);
1728
#else /* not __GLIBC_PREREQ(2, 15) */
1729
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1731
#endif /* not __GLIBC_PREREQ(2, 15) */
1732
#else /* not __GLIBC__ */
1733
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1735
#endif /* not __GLIBC__ */
1737
perror_plus("scandir");
1740
struct dirent *direntry;
1742
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1744
perror_plus("open(\"/dev/null\", O_RDONLY)");
1747
for(int i = 0; i < numhooks; i++){
1748
direntry = direntries[i];
1750
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1753
pid_t hook_pid = fork();
1756
/* Raise privileges */
1757
errno = raise_privileges_permanently();
1759
perror_plus("Failed to raise privileges");
1766
perror_plus("setgid");
1769
/* Reset supplementary groups */
1771
ret = setgroups(0, NULL);
1773
perror_plus("setgroups");
1776
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1778
perror_plus("setenv");
1781
ret = setenv("DEVICE", interface, 1);
1783
perror_plus("setenv");
1786
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1788
perror_plus("setenv");
1791
ret = setenv("MODE", mode, 1);
1793
perror_plus("setenv");
1797
ret = asprintf(&delaystring, "%f", (double)delay);
1799
perror_plus("asprintf");
1802
ret = setenv("DELAY", delaystring, 1);
1805
perror_plus("setenv");
1809
if(connect_to != NULL){
1810
ret = setenv("CONNECT", connect_to, 1);
1812
perror_plus("setenv");
1816
int hook_fd = TEMP_FAILURE_RETRY(openat(hookdir_fd,
1820
perror_plus("openat");
1821
_exit(EXIT_FAILURE);
1823
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1824
perror_plus("close");
1825
_exit(EXIT_FAILURE);
1827
ret = dup2(devnull, STDIN_FILENO);
1829
perror_plus("dup2(devnull, STDIN_FILENO)");
1832
ret = close(devnull);
1834
perror_plus("close");
1837
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1839
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1842
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1844
perror_plus("fexecve");
1845
_exit(EXIT_FAILURE);
1849
perror_plus("fork");
1854
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1855
perror_plus("waitpid");
1859
if(WIFEXITED(status)){
1860
if(WEXITSTATUS(status) != 0){
1861
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1862
" with status %d\n", direntry->d_name,
1863
WEXITSTATUS(status));
1867
} else if(WIFSIGNALED(status)){
1868
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1869
" signal %d\n", direntry->d_name,
1874
fprintf_plus(stderr, "Warning: network hook \"%s\""
1875
" crashed\n", direntry->d_name);
1881
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1887
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1888
perror_plus("close");
1895
__attribute__((nonnull, warn_unused_result))
1896
error_t bring_up_interface(const char *const interface,
1898
error_t old_errno = errno;
1900
struct ifreq network;
1901
unsigned int if_index = if_nametoindex(interface);
1903
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1913
if(not interface_is_up(interface)){
1914
error_t ret_errno = 0, ioctl_errno = 0;
1915
if(not get_flags(interface, &network)){
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1922
network.ifr_flags |= IFF_UP; /* set flag */
1924
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1927
perror_plus("socket");
1933
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1935
perror_plus("close");
1942
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1946
/* Raise privileges */
1947
ret_errno = raise_privileges();
1950
perror_plus("Failed to raise privileges");
1955
bool restore_loglevel = false;
1957
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1958
messages about the network interface to mess up the prompt */
1959
ret_linux = klogctl(8, NULL, 5);
1960
if(ret_linux == -1){
1961
perror_plus("klogctl");
1963
restore_loglevel = true;
1966
#endif /* __linux__ */
1967
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1968
ioctl_errno = errno;
1970
if(restore_loglevel){
1971
ret_linux = klogctl(7, NULL, 0);
1972
if(ret_linux == -1){
1973
perror_plus("klogctl");
1976
#endif /* __linux__ */
1978
/* If raise_privileges() succeeded above */
1980
/* Lower privileges */
1981
ret_errno = lower_privileges();
1984
perror_plus("Failed to lower privileges");
1988
/* Close the socket */
1989
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1991
perror_plus("close");
1994
if(ret_setflags == -1){
1995
errno = ioctl_errno;
1996
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2001
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2005
/* Sleep checking until interface is running.
2006
Check every 0.25s, up to total time of delay */
2007
for(int i=0; i < delay * 4; i++){
2008
if(interface_is_running(interface)){
2011
struct timespec sleeptime = { .tv_nsec = 250000000 };
2012
ret = nanosleep(&sleeptime, NULL);
2013
if(ret == -1 and errno != EINTR){
2014
perror_plus("nanosleep");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t take_down_interface(const char *const interface){
2024
error_t old_errno = errno;
2025
struct ifreq network;
2026
unsigned int if_index = if_nametoindex(interface);
2028
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2032
if(interface_is_up(interface)){
2033
error_t ret_errno = 0, ioctl_errno = 0;
2034
if(not get_flags(interface, &network) and debug){
2036
fprintf_plus(stderr, "Failed to get flags for interface "
2037
"\"%s\"\n", interface);
2041
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2043
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2046
perror_plus("socket");
2052
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2056
/* Raise privileges */
2057
ret_errno = raise_privileges();
2060
perror_plus("Failed to raise privileges");
2063
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2064
ioctl_errno = errno;
2066
/* If raise_privileges() succeeded above */
2068
/* Lower privileges */
2069
ret_errno = lower_privileges();
2072
perror_plus("Failed to lower privileges");
2076
/* Close the socket */
2077
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2079
perror_plus("close");
2082
if(ret_setflags == -1){
2083
errno = ioctl_errno;
2084
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2089
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
715
/* Combines file name and path and returns the malloced new
716
string. some sane checks could/should be added */
717
static const char *combinepath(const char *first, const char *second){
718
size_t f_len = strlen(first);
719
size_t s_len = strlen(second);
720
char *tmp = malloc(f_len + s_len + 2);
725
memcpy(tmp, first, f_len); /* Spurious warning */
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
731
tmp[f_len + 1 + s_len] = '\0';
2097
736
int main(int argc, char *argv[]){
2098
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2099
.priority = "SECURE256:!CTYPE-X.509:"
2100
"+CTYPE-OPENPGP", .current_server = NULL,
2101
.interfaces = NULL, .interfaces_size = 0 };
2102
AvahiSServiceBrowser *sb = NULL;
2107
int exitcode = EXIT_SUCCESS;
2108
char *interfaces_to_take_down = NULL;
2109
size_t interfaces_to_take_down_size = 0;
2110
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2111
char old_tempdir[] = "/tmp/mandosXXXXXX";
2112
char *tempdir = NULL;
2113
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2114
const char *seckey = PATHDIR "/" SECKEY;
2115
const char *pubkey = PATHDIR "/" PUBKEY;
2116
char *interfaces_hooks = NULL;
2118
bool gnutls_initialized = false;
2119
bool gpgme_initialized = false;
2121
double retry_interval = 10; /* 10s between trying a server and
2122
retrying the same server again */
2124
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2125
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2130
/* Lower any group privileges we might have, just to be safe */
2134
perror_plus("setgid");
2137
/* Lower user privileges (temporarily) */
2141
perror_plus("seteuid");
2149
struct argp_option options[] = {
2150
{ .name = "debug", .key = 128,
2151
.doc = "Debug mode", .group = 3 },
2152
{ .name = "connect", .key = 'c',
2153
.arg = "ADDRESS:PORT",
2154
.doc = "Connect directly to a specific Mandos server",
2156
{ .name = "interface", .key = 'i',
2158
.doc = "Network interface that will be used to search for"
2161
{ .name = "seckey", .key = 's',
2163
.doc = "OpenPGP secret key file base name",
2165
{ .name = "pubkey", .key = 'p',
2167
.doc = "OpenPGP public key file base name",
2169
{ .name = "dh-bits", .key = 129,
2171
.doc = "Bit length of the prime number used in the"
2172
" Diffie-Hellman key exchange",
2174
{ .name = "priority", .key = 130,
2176
.doc = "GnuTLS priority string for the TLS handshake",
2178
{ .name = "delay", .key = 131,
2180
.doc = "Maximum delay to wait for interface startup",
2182
{ .name = "retry", .key = 132,
2184
.doc = "Retry interval used when denied by the Mandos server",
2186
{ .name = "network-hook-dir", .key = 133,
2188
.doc = "Directory where network hooks are located",
2191
* These reproduce what we would get without ARGP_NO_HELP
2193
{ .name = "help", .key = '?',
2194
.doc = "Give this help list", .group = -1 },
2195
{ .name = "usage", .key = -3,
2196
.doc = "Give a short usage message", .group = -1 },
2197
{ .name = "version", .key = 'V',
2198
.doc = "Print program version", .group = -1 },
2202
error_t parse_opt(int key, char *arg,
2203
struct argp_state *state){
2206
case 128: /* --debug */
2209
case 'c': /* --connect */
2212
case 'i': /* --interface */
2213
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2216
argp_error(state, "%s", strerror(ret_errno));
2219
case 's': /* --seckey */
2222
case 'p': /* --pubkey */
2225
case 129: /* --dh-bits */
2227
tmpmax = strtoimax(arg, &tmp, 10);
2228
if(errno != 0 or tmp == arg or *tmp != '\0'
2229
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2230
argp_error(state, "Bad number of DH bits");
2232
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2234
case 130: /* --priority */
2237
case 131: /* --delay */
2239
delay = strtof(arg, &tmp);
2240
if(errno != 0 or tmp == arg or *tmp != '\0'){
2241
argp_error(state, "Bad delay");
2243
case 132: /* --retry */
2245
retry_interval = strtod(arg, &tmp);
2246
if(errno != 0 or tmp == arg or *tmp != '\0'
2247
or (retry_interval * 1000) > INT_MAX
2248
or retry_interval < 0){
2249
argp_error(state, "Bad retry interval");
2252
case 133: /* --network-hook-dir */
2256
* These reproduce what we would get without ARGP_NO_HELP
2258
case '?': /* --help */
2259
argp_state_help(state, state->out_stream,
2260
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2261
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2262
case -3: /* --usage */
2263
argp_state_help(state, state->out_stream,
2264
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2265
case 'V': /* --version */
2266
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2267
exit(argp_err_exit_status);
2270
return ARGP_ERR_UNKNOWN;
2275
struct argp argp = { .options = options, .parser = parse_opt,
2277
.doc = "Mandos client -- Get and decrypt"
2278
" passwords from a Mandos server" };
2279
ret = argp_parse(&argp, argc, argv,
2280
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2287
perror_plus("argp_parse");
2288
exitcode = EX_OSERR;
2291
exitcode = EX_USAGE;
2297
/* Work around Debian bug #633582:
2298
<http://bugs.debian.org/633582> */
2300
/* Re-raise privileges */
2301
ret_errno = raise_privileges();
2304
perror_plus("Failed to raise privileges");
2308
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2309
int seckey_fd = open(seckey, O_RDONLY);
2310
if(seckey_fd == -1){
2311
perror_plus("open");
2313
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2315
perror_plus("fstat");
2317
if(S_ISREG(st.st_mode)
2318
and st.st_uid == 0 and st.st_gid == 0){
2319
ret = fchown(seckey_fd, uid, gid);
2321
perror_plus("fchown");
2325
TEMP_FAILURE_RETRY(close(seckey_fd));
2329
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2330
int pubkey_fd = open(pubkey, O_RDONLY);
2331
if(pubkey_fd == -1){
2332
perror_plus("open");
2334
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2336
perror_plus("fstat");
2338
if(S_ISREG(st.st_mode)
2339
and st.st_uid == 0 and st.st_gid == 0){
2340
ret = fchown(pubkey_fd, uid, gid);
2342
perror_plus("fchown");
2346
TEMP_FAILURE_RETRY(close(pubkey_fd));
2350
/* Lower privileges */
2351
ret_errno = lower_privileges();
2354
perror_plus("Failed to lower privileges");
2359
/* Remove invalid interface names (except "none") */
2361
char *interface = NULL;
2362
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2364
if(strcmp(interface, "none") != 0
2365
and if_nametoindex(interface) == 0){
2366
if(interface[0] != '\0'){
2367
fprintf_plus(stderr, "Not using nonexisting interface"
2368
" \"%s\"\n", interface);
2370
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2376
/* Run network hooks */
2378
if(mc.interfaces != NULL){
2379
interfaces_hooks = malloc(mc.interfaces_size);
2380
if(interfaces_hooks == NULL){
2381
perror_plus("malloc");
2384
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2385
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2387
run_network_hooks("start", interfaces_hooks != NULL ?
2388
interfaces_hooks : "", delay);
2392
avahi_set_log_function(empty_log);
2395
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2396
from the signal handler */
2397
/* Initialize the pseudo-RNG for Avahi */
2398
srand((unsigned int) time(NULL));
2399
simple_poll = avahi_simple_poll_new();
2400
if(simple_poll == NULL){
2401
fprintf_plus(stderr,
2402
"Avahi: Failed to create simple poll object.\n");
2403
exitcode = EX_UNAVAILABLE;
2407
sigemptyset(&sigterm_action.sa_mask);
2408
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2410
perror_plus("sigaddset");
2411
exitcode = EX_OSERR;
2414
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2416
perror_plus("sigaddset");
2417
exitcode = EX_OSERR;
2420
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2422
perror_plus("sigaddset");
2423
exitcode = EX_OSERR;
2426
/* Need to check if the handler is SIG_IGN before handling:
2427
| [[info:libc:Initial Signal Actions]] |
2428
| [[info:libc:Basic Signal Handling]] |
2430
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2432
perror_plus("sigaction");
2435
if(old_sigterm_action.sa_handler != SIG_IGN){
2436
ret = sigaction(SIGINT, &sigterm_action, NULL);
2438
perror_plus("sigaction");
2439
exitcode = EX_OSERR;
2443
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2445
perror_plus("sigaction");
2448
if(old_sigterm_action.sa_handler != SIG_IGN){
2449
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2451
perror_plus("sigaction");
2452
exitcode = EX_OSERR;
2456
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2458
perror_plus("sigaction");
2461
if(old_sigterm_action.sa_handler != SIG_IGN){
2462
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2464
perror_plus("sigaction");
2465
exitcode = EX_OSERR;
2470
/* If no interfaces were specified, make a list */
2471
if(mc.interfaces == NULL){
2472
struct dirent **direntries = NULL;
2473
/* Look for any good interfaces */
2474
ret = scandir(sys_class_net, &direntries, good_interface,
2477
/* Add all found interfaces to interfaces list */
2478
for(int i = 0; i < ret; ++i){
2479
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2480
direntries[i]->d_name);
2483
perror_plus("argz_add");
2484
free(direntries[i]);
2488
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2489
direntries[i]->d_name);
2491
free(direntries[i]);
2498
fprintf_plus(stderr, "Could not find a network interface\n");
737
AvahiSServiceBrowser *sb = NULL;
740
int exitcode = EXIT_SUCCESS;
741
const char *interface = "eth0";
742
struct ifreq network;
746
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
760
.doc = "Connect directly to a sepcified mandos server",
762
{ .name = "interface", .key = 'i',
764
.doc = "Interface that Avahi will conntect through",
766
{ .name = "keydir", .key = 'd',
768
.doc = "Directory where the openpgp keyring is",
770
{ .name = "seckey", .key = 's',
772
.doc = "Secret openpgp key for gnutls authentication",
774
{ .name = "pubkey", .key = 'p',
776
.doc = "Public openpgp key for gnutls authentication",
778
{ .name = "dh-bits", .key = 129,
780
.doc = "dh-bits to use in gnutls communication",
782
{ .name = "priority", .key = 130,
784
.doc = "GNUTLS priority", .group = 1 },
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
829
return ARGP_ERR_UNKNOWN;
834
struct argp argp = { .options = options, .parser = parse_opt,
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
2499
844
exitcode = EXIT_FAILURE;
2504
/* Bring up interfaces which are down, and remove any "none"s */
2506
char *interface = NULL;
2507
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2509
/* If interface name is "none", stop bringing up interfaces.
2510
Also remove all instances of "none" from the list */
2511
if(strcmp(interface, "none") == 0){
2512
argz_delete(&mc.interfaces, &mc.interfaces_size,
2515
while((interface = argz_next(mc.interfaces,
2516
mc.interfaces_size, interface))){
2517
if(strcmp(interface, "none") == 0){
2518
argz_delete(&mc.interfaces, &mc.interfaces_size,
2525
bool interface_was_up = interface_is_up(interface);
2526
errno = bring_up_interface(interface, delay);
2527
if(not interface_was_up){
2529
perror_plus("Failed to bring up interface");
2531
errno = argz_add(&interfaces_to_take_down,
2532
&interfaces_to_take_down_size,
2535
perror_plus("argz_add");
2540
if(debug and (interfaces_to_take_down == NULL)){
2541
fprintf_plus(stderr, "No interfaces were brought up\n");
2545
/* If we only got one interface, explicitly use only that one */
2546
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2548
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2551
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2558
ret = init_gnutls_global(pubkey, seckey, &mc);
2560
fprintf_plus(stderr, "init_gnutls_global failed\n");
2561
exitcode = EX_UNAVAILABLE;
2564
gnutls_initialized = true;
2571
/* Try /run/tmp before /tmp */
2572
tempdir = mkdtemp(run_tempdir);
2573
if(tempdir == NULL and errno == ENOENT){
2575
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2576
run_tempdir, old_tempdir);
2578
tempdir = mkdtemp(old_tempdir);
2580
if(tempdir == NULL){
2581
perror_plus("mkdtemp");
2589
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2590
fprintf_plus(stderr, "init_gpgme failed\n");
2591
exitcode = EX_UNAVAILABLE;
2594
gpgme_initialized = true;
2601
if(connect_to != NULL){
2602
/* Connect directly, do not use Zeroconf */
2603
/* (Mainly meant for debugging) */
2604
char *address = strrchr(connect_to, ':');
2606
if(address == NULL){
2607
fprintf_plus(stderr, "No colon in address\n");
2608
exitcode = EX_USAGE;
2618
tmpmax = strtoimax(address+1, &tmp, 10);
2619
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2620
or tmpmax != (in_port_t)tmpmax){
2621
fprintf_plus(stderr, "Bad port number\n");
2622
exitcode = EX_USAGE;
2630
port = (in_port_t)tmpmax;
2632
/* Colon in address indicates IPv6 */
2634
if(strchr(connect_to, ':') != NULL){
2636
/* Accept [] around IPv6 address - see RFC 5952 */
2637
if(connect_to[0] == '[' and address[-1] == ']')
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
856
fprintf(stderr, "init_gnutls_global\n");
2645
address = connect_to;
859
gnutls_initalized = true;
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
881
if(connect_to != NULL){
882
/* Connect directly, do not use Zeroconf */
883
/* (Mainly meant for debugging) */
884
char *address = strrchr(connect_to, ':');
886
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
893
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
898
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
901
exitcode = EXIT_FAILURE;
903
exitcode = EXIT_SUCCESS;
2651
while(not quit_now){
2652
ret = start_mandos_communication(address, port, if_index, af,
2654
if(quit_now or ret == 0){
2658
fprintf_plus(stderr, "Retrying in %d seconds\n",
2659
(int)retry_interval);
2661
sleep((unsigned int)retry_interval);
2665
exitcode = EXIT_SUCCESS;
2676
AvahiServerConfig config;
2677
/* Do not publish any local Zeroconf records */
2678
avahi_server_config_init(&config);
2679
config.publish_hinfo = 0;
2680
config.publish_addresses = 0;
2681
config.publish_workstation = 0;
2682
config.publish_domain = 0;
2684
/* Allocate a new server */
2685
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2686
&config, NULL, NULL, &ret_errno);
2688
/* Free the Avahi configuration data */
2689
avahi_server_config_free(&config);
2692
/* Check if creating the Avahi server object succeeded */
2693
if(mc.server == NULL){
2694
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2695
avahi_strerror(ret_errno));
2696
exitcode = EX_UNAVAILABLE;
2704
/* Create the Avahi service browser */
2705
sb = avahi_s_service_browser_new(mc.server, if_index,
2706
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2707
NULL, 0, browse_callback,
2710
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2711
avahi_strerror(avahi_server_errno(mc.server)));
2712
exitcode = EX_UNAVAILABLE;
2720
/* Run the main loop */
2723
fprintf_plus(stderr, "Starting Avahi loop search\n");
2726
ret = avahi_loop_with_timeout(simple_poll,
2727
(int)(retry_interval * 1000), &mc);
2729
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2730
(ret == 0) ? "successfully" : "with error");
908
/* If the interface is down, bring it up */
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
913
exitcode = EXIT_FAILURE;
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
936
avahi_set_log_function(empty_log);
939
/* Initialize the pseudo-RNG for Avahi */
940
srand((unsigned int) time(NULL));
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
947
exitcode = EXIT_FAILURE;
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
972
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
980
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
983
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
989
/* Run the main loop */
992
fprintf(stderr, "Starting Avahi loop search\n");
995
avahi_simple_poll_loop(mc.simple_poll);
2736
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2739
/* Cleanup things */
2740
free(mc.interfaces);
2743
avahi_s_service_browser_free(sb);
2745
if(mc.server != NULL)
2746
avahi_server_free(mc.server);
2748
if(simple_poll != NULL)
2749
avahi_simple_poll_free(simple_poll);
2751
if(gnutls_initialized){
2752
gnutls_certificate_free_credentials(mc.cred);
2753
gnutls_global_deinit();
2754
gnutls_dh_params_deinit(mc.dh_params);
2757
if(gpgme_initialized){
2758
gpgme_release(mc.ctx);
2761
/* Cleans up the circular linked list of Mandos servers the client
2763
if(mc.current_server != NULL){
2764
mc.current_server->prev->next = NULL;
2765
while(mc.current_server != NULL){
2766
server *next = mc.current_server->next;
2768
#pragma GCC diagnostic push
2769
#pragma GCC diagnostic ignored "-Wcast-qual"
2771
free((char *)(mc.current_server->ip));
2773
#pragma GCC diagnostic pop
2775
free(mc.current_server);
2776
mc.current_server = next;
2780
/* Re-raise privileges */
2782
ret_errno = raise_privileges();
2785
perror_plus("Failed to raise privileges");
2788
/* Run network hooks */
2789
run_network_hooks("stop", interfaces_hooks != NULL ?
2790
interfaces_hooks : "", delay);
2792
/* Take down the network interfaces which were brought up */
2794
char *interface = NULL;
2795
while((interface=argz_next(interfaces_to_take_down,
2796
interfaces_to_take_down_size,
2798
ret_errno = take_down_interface(interface);
2801
perror_plus("Failed to take down interface");
2804
if(debug and (interfaces_to_take_down == NULL)){
2805
fprintf_plus(stderr, "No interfaces needed to be taken"
2811
ret_errno = lower_privileges_permanently();
2814
perror_plus("Failed to lower privileges permanently");
2818
free(interfaces_to_take_down);
2819
free(interfaces_hooks);
2821
/* Removes the GPGME temp directory and all files inside */
2822
if(tempdir != NULL){
2823
struct dirent **direntries = NULL;
2824
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2828
if(tempdir_fd == -1){
2829
perror_plus("open");
2832
#if __GLIBC_PREREQ(2, 15)
2833
int numentries = scandirat(tempdir_fd, ".", &direntries,
2834
notdotentries, alphasort);
2835
#else /* not __GLIBC_PREREQ(2, 15) */
2836
int numentries = scandir(tempdir, &direntries, notdotentries,
2838
#endif /* not __GLIBC_PREREQ(2, 15) */
2839
#else /* not __GLIBC__ */
2840
int numentries = scandir(tempdir, &direntries, notdotentries,
2842
#endif /* not __GLIBC__ */
2843
if(numentries >= 0){
2844
for(int i = 0; i < numentries; i++){
2845
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2847
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2848
" \"%s\", 0): %s\n", tempdir,
2849
direntries[i]->d_name, strerror(errno));
2851
free(direntries[i]);
2854
/* need to clean even if 0 because man page doesn't specify */
2856
if(numentries == -1){
2857
perror_plus("scandir");
2859
ret = rmdir(tempdir);
2860
if(ret == -1 and errno != ENOENT){
2861
perror_plus("rmdir");
2864
TEMP_FAILURE_RETRY(close(tempdir_fd));
2869
sigemptyset(&old_sigterm_action.sa_mask);
2870
old_sigterm_action.sa_handler = SIG_DFL;
2871
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2872
&old_sigterm_action,
2875
perror_plus("sigaction");
2878
ret = raise(signal_received);
2879
} while(ret != 0 and errno == EINTR);
2881
perror_plus("raise");
2884
TEMP_FAILURE_RETRY(pause());
1000
fprintf(stderr, "%s exiting\n", argv[0]);
1003
/* Cleanup things */
1005
avahi_s_service_browser_free(sb);
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();