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- Committer: Teddy Hogeborn
- Date: 2015-05-31 15:29:22 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 325.
- Revision ID: teddy@recompile.se-20150531152922-o1xv6qr3hbj1twm0
mandos: Use codecs.open() and print() for PID file.
Use more Pythonic code, closer to the Python 3 style.
Use more Pythonic code, closer to the Python 3 style.
- files added:
- debian/mandos-client.examples
- debian/upstream
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 Björn Påhlsson
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
O_CLOEXEC, pipe2() */
27
27
#include <stddef.h> /* size_t, NULL */
28
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
29
realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
40
WEXITSTATUS(), WTERMSIG(),
42
41
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
58
57
#include <errno.h> /* errno */
59
58
#include <argp.h> /* struct argp_option, struct
60
59
argp_state, struct argp,
72
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
72
#include <errno.h> /* errno */
74
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
75
76
76
#define BUFFER_SIZE 256
77
77
105
105
106
106
/* Gets an existing plugin based on name,
107
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
108
109
static plugin *getplugin(char *name){
109
110
/* Check for existing plugin with that name */
110
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
171
172
}
172
173
173
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
174
176
static bool add_to_char_array(const char *new, char ***array,
175
177
int *len){
176
178
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
177
180
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
181
184
/* Malloc check */
182
if(*array == NULL){
185
if(new_array == NULL){
183
186
return false;
184
187
}
188
*array = new_array;
185
189
/* Make a copy of the new string */
186
190
char *copy;
187
191
do {
199
203
}
200
204
201
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
202
207
static bool add_argument(plugin *p, const char *arg){
203
208
if(p == NULL){
204
209
return false;
207
212
}
208
213
209
214
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
210
216
static bool add_environment(plugin *p, const char *def, bool replace){
211
217
if(p == NULL){
212
218
return false;
214
220
/* namelen = length of name of environment variable */
215
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
222
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
219
225
/* It already exists */
220
226
if(replace){
221
char *new;
227
char *new_envdef;
222
228
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
226
232
return false;
227
233
}
228
*e = new;
229
strcpy(*e, def);
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
230
236
}
231
237
return true;
232
238
}
234
240
return add_to_char_array(def, &(p->environ), &(p->envc));
235
241
}
236
242
243
#ifndef O_CLOEXEC
237
244
/*
238
245
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
246
* Descriptor Flags".
240
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
241
248
*/
249
__attribute__((warn_unused_result))
242
250
static int set_cloexec_flag(int fd){
243
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
244
252
/* If reading the flags failed, return error indication now. */
249
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
258
ret | FD_CLOEXEC));
251
259
}
260
#endif /* not O_CLOEXEC */
252
261
253
262
254
263
/* Mark processes as completed when they exit, and save their exit
286
295
}
287
296
288
297
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
289
299
static bool print_out_password(const char *buffer, size_t length){
290
300
ssize_t ret;
291
301
for(size_t written = 0; written < length; written += (size_t)ret){
299
309
}
300
310
301
311
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
302
313
static void free_plugin(plugin *plugin_node){
303
314
304
315
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
338
349
char *plugindir = NULL;
339
350
char *argfile = NULL;
340
351
FILE *conffp;
341
size_t d_name_len;
342
DIR *dir = NULL;
343
struct dirent *dirst;
352
struct dirent **direntries = NULL;
344
353
struct stat st;
345
354
fd_set rfds_all;
346
355
int ret, maxfd = 0;
354
363
.sa_flags = SA_NOCLDSTOP };
355
364
char **custom_argv = NULL;
356
365
int custom_argc = 0;
366
int dir_fd = -1;
357
367
358
368
/* Establish a signal handler */
359
369
sigemptyset(&sigchld_action.sa_mask);
416
426
{ .name = NULL }
417
427
};
418
428
429
__attribute__((nonnull(3)))
419
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
431
errno = 0;
421
432
switch(key){
422
433
char *tmp;
423
intmax_t tmpmax;
434
intmax_t tmp_id;
424
435
case 'g': /* --global-options */
425
436
{
426
437
char *plugin_option;
429
440
break;
430
441
}
431
442
}
443
errno = 0;
432
444
}
433
445
break;
434
446
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
436
450
break;
437
451
case 'o': /* --options-for */
438
452
{
455
469
break;
456
470
}
457
471
}
472
errno = 0;
458
473
}
459
474
break;
460
475
case 'E': /* --env-for */
472
487
errno = EINVAL;
473
488
break;
474
489
}
475
add_environment(getplugin(arg), envdef, true);
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
476
493
}
477
494
break;
478
495
case 'd': /* --disable */
480
497
plugin *p = getplugin(arg);
481
498
if(p != NULL){
482
499
p->disabled = true;
500
errno = 0;
483
501
}
484
502
}
485
503
break;
488
506
plugin *p = getplugin(arg);
489
507
if(p != NULL){
490
508
p->disabled = false;
509
errno = 0;
491
510
}
492
511
}
493
512
break;
494
513
case 128: /* --plugin-dir */
495
514
free(plugindir);
496
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
497
519
break;
498
520
case 129: /* --config-file */
499
521
/* This is already done by parse_opt_config_file() */
500
522
break;
501
523
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
524
tmp_id = strtoimax(arg, &tmp, 10);
503
525
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
526
or tmp_id != (uid_t)tmp_id){
505
527
argp_error(state, "Bad user ID number: \"%s\", using %"
506
528
PRIdMAX, arg, (intmax_t)uid);
507
529
break;
508
530
}
509
uid = (uid_t)tmpmax;
531
uid = (uid_t)tmp_id;
532
errno = 0;
510
533
break;
511
534
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
535
tmp_id = strtoimax(arg, &tmp, 10);
513
536
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
537
or tmp_id != (gid_t)tmp_id){
515
538
argp_error(state, "Bad group ID number: \"%s\", using %"
516
539
PRIdMAX, arg, (intmax_t)gid);
517
540
break;
518
541
}
519
gid = (gid_t)tmpmax;
542
gid = (gid_t)tmp_id;
543
errno = 0;
520
544
break;
521
545
case 132: /* --debug */
522
546
debug = true;
570
594
case 129: /* --config-file */
571
595
free(argfile);
572
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
573
600
break;
574
601
case 130: /* --userid */
575
602
case 131: /* --groupid */
658
685
}
659
686
660
687
custom_argc += 1;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
666
free(org_line);
667
goto fallback;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
668
701
}
669
702
custom_argv[custom_argc-1] = new_arg;
670
703
custom_argv[custom_argc] = NULL;
742
775
}
743
776
}
744
777
745
{
778
if(getuid() == 0){
746
779
/* Work around Debian bug #633582:
747
780
<http://bugs.debian.org/633582> */
748
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
782
if(plugindir_fd == -1){
750
error(0, errno, "open");
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
751
786
} else {
752
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
788
if(ret == -1){
765
800
}
766
801
767
802
/* Lower permissions */
768
setgid(gid);
803
ret = setgid(gid);
769
804
if(ret == -1){
770
805
error(0, errno, "setgid");
771
806
}
776
811
777
812
/* Open plugin directory with close_on_exec flag */
778
813
{
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
797
821
if(dir_fd == -1){
798
822
error(0, errno, "Could not open plugin dir");
799
823
exitstatus = EX_UNAVAILABLE;
805
829
ret = set_cloexec_flag(dir_fd);
806
830
if(ret < 0){
807
831
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
832
exitstatus = EX_OSERR;
810
833
goto fallback;
811
834
}
812
835
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
836
}
837
838
int good_name(const struct dirent * const dirent){
839
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
840
"*.dpkg-old", "*.dpkg-bak",
841
"*.dpkg-divert", NULL };
842
#ifdef __GNUC__
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
845
#endif
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
848
#ifdef __GNUC__
849
#pragma GCC diagnostic pop
850
#endif
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
852
!= FNM_NOMATCH){
853
if(debug){
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
856
}
857
return 0;
858
}
820
859
}
860
return 1;
861
}
862
863
#ifdef __GLIBC__
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
866
alphasort);
867
#else /* not __GLIBC_PREREQ(2, 15) */
868
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
869
&direntries, good_name, alphasort);
870
#endif /* not __GLIBC_PREREQ(2, 15) */
871
#else /* not __GLIBC__ */
872
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
873
&direntries, good_name, alphasort);
874
#endif /* not __GLIBC__ */
875
if(numplugins == -1){
876
error(0, errno, "Could not scan plugin dir");
877
direntries = NULL;
878
exitstatus = EX_OSERR;
879
goto fallback;
821
880
}
822
881
823
882
FD_ZERO(&rfds_all);
824
883
825
884
/* Read and execute any executable in the plugin directory*/
826
while(true){
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
830
831
/* All directory entries have been processed */
832
if(dirst == NULL){
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
836
goto fallback;
837
}
838
break;
839
}
840
841
d_name_len = strlen(dirst->d_name);
842
843
/* Ignore dotfiles, backup files and other junk */
844
{
845
bool bad_name = false;
846
847
const char const *bad_prefixes[] = { ".", "#", NULL };
848
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
850
".dpkg-old",
851
".dpkg-bak",
852
".dpkg-divert", NULL };
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
854
size_t pre_len = strlen(*pre);
855
if((d_name_len >= pre_len)
856
and strncmp((dirst->d_name), *pre, pre_len) == 0){
857
if(debug){
858
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
" with bad prefix %s\n", dirst->d_name, *pre);
860
}
861
bad_name = true;
862
break;
863
}
864
}
865
if(bad_name){
866
continue;
867
}
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
size_t suf_len = strlen(*suf);
870
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
872
== 0)){
873
if(debug){
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
875
" with bad suffix %s\n", dirst->d_name, *suf);
876
}
877
bad_name = true;
878
break;
879
}
880
}
881
882
if(bad_name){
883
continue;
884
}
885
}
886
887
char *filename;
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
891
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
895
}
896
if(ret < 0){
897
error(0, errno, "asprintf");
885
for(int i = 0; i < numplugins; i++){
886
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
888
if(plugin_fd == -1){
889
error(0, errno, "Could not open plugin");
890
free(direntries[i]);
898
891
continue;
899
892
}
900
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
893
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
902
894
if(ret == -1){
903
895
error(0, errno, "stat");
904
free(filename);
896
TEMP_FAILURE_RETRY(close(plugin_fd));
897
free(direntries[i]);
905
898
continue;
906
899
}
907
900
908
901
/* Ignore non-executable files */
909
902
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
903
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
904
X_OK, 0)) != 0)){
911
905
if(debug){
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
" with bad type or mode\n", filename);
906
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
907
" with bad type or mode\n",
908
plugindir != NULL ? plugindir : PDIR,
909
direntries[i]->d_name);
914
910
}
915
free(filename);
911
TEMP_FAILURE_RETRY(close(plugin_fd));
912
free(direntries[i]);
916
913
continue;
917
914
}
918
915
919
plugin *p = getplugin(dirst->d_name);
916
plugin *p = getplugin(direntries[i]->d_name);
920
917
if(p == NULL){
921
918
error(0, errno, "getplugin");
922
free(filename);
919
TEMP_FAILURE_RETRY(close(plugin_fd));
920
free(direntries[i]);
923
921
continue;
924
922
}
925
923
if(p->disabled){
926
924
if(debug){
927
925
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
928
dirst->d_name);
926
direntries[i]->d_name);
929
927
}
930
free(filename);
928
TEMP_FAILURE_RETRY(close(plugin_fd));
929
free(direntries[i]);
931
930
continue;
932
931
}
933
932
{
947
946
}
948
947
}
949
948
}
950
/* If this plugin has any environment variables, we will call
951
using execve and need to duplicate the environment from this
952
process, too. */
949
/* If this plugin has any environment variables, we need to
950
duplicate the environment from this process, too. */
953
951
if(p->environ[0] != NULL){
954
952
for(char **e = environ; *e != NULL; e++){
955
953
if(not add_environment(p, *e, false)){
959
957
}
960
958
961
959
int pipefd[2];
960
#ifndef O_CLOEXEC
962
961
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
962
#else /* O_CLOEXEC */
963
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
964
#endif /* O_CLOEXEC */
963
965
if(ret == -1){
964
966
error(0, errno, "pipe");
965
967
exitstatus = EX_OSERR;
966
goto fallback;
967
}
968
free(direntries[i]);
969
goto fallback;
970
}
971
if(pipefd[0] >= FD_SETSIZE){
972
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
973
FD_SETSIZE);
974
TEMP_FAILURE_RETRY(close(pipefd[0]));
975
TEMP_FAILURE_RETRY(close(pipefd[1]));
976
exitstatus = EX_OSERR;
977
free(direntries[i]);
978
goto fallback;
979
}
980
#ifndef O_CLOEXEC
968
981
/* Ask OS to automatic close the pipe on exec */
969
982
ret = set_cloexec_flag(pipefd[0]);
970
983
if(ret < 0){
971
984
error(0, errno, "set_cloexec_flag");
985
TEMP_FAILURE_RETRY(close(pipefd[0]));
986
TEMP_FAILURE_RETRY(close(pipefd[1]));
972
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
973
989
goto fallback;
974
990
}
975
991
ret = set_cloexec_flag(pipefd[1]);
976
992
if(ret < 0){
977
993
error(0, errno, "set_cloexec_flag");
994
TEMP_FAILURE_RETRY(close(pipefd[0]));
995
TEMP_FAILURE_RETRY(close(pipefd[1]));
978
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
979
998
goto fallback;
980
999
}
1000
#endif /* not O_CLOEXEC */
981
1001
/* Block SIGCHLD until process is safely in process list */
982
1002
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
1003
&sigchld_action.sa_mask,
985
1005
if(ret < 0){
986
1006
error(0, errno, "sigprocmask");
987
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
988
1009
goto fallback;
989
1010
}
990
1011
/* Starting a new process to be watched */
994
1015
} while(pid == -1 and errno == EINTR);
995
1016
if(pid == -1){
996
1017
error(0, errno, "fork");
1018
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1019
&sigchld_action.sa_mask, NULL));
1020
TEMP_FAILURE_RETRY(close(pipefd[0]));
1021
TEMP_FAILURE_RETRY(close(pipefd[1]));
997
1022
exitstatus = EX_OSERR;
1023
free(direntries[i]);
998
1024
goto fallback;
999
1025
}
1000
1026
if(pid == 0){
1016
1042
_exit(EX_OSERR);
1017
1043
}
1018
1044
1019
if(dirfd(dir) < 0){
1020
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1021
above and must now close it manually here. */
1022
closedir(dir);
1023
}
1024
if(p->environ[0] == NULL){
1025
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
1028
}
1029
} else {
1030
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
1033
}
1045
if(fexecve(plugin_fd, p->argv,
1046
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1047
error(0, errno, "fexecve for %s/%s",
1048
plugindir != NULL ? plugindir : PDIR,
1049
direntries[i]->d_name);
1050
_exit(EX_OSERR);
1034
1051
}
1035
1052
/* no return */
1036
1053
}
1037
1054
/* Parent process */
1038
1055
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
1056
pipe */
1040
free(filename);
1041
plugin *new_plugin = getplugin(dirst->d_name);
1057
TEMP_FAILURE_RETRY(close(plugin_fd));
1058
plugin *new_plugin = getplugin(direntries[i]->d_name);
1042
1059
if(new_plugin == NULL){
1043
1060
error(0, errno, "getplugin");
1044
1061
ret = (int)(TEMP_FAILURE_RETRY
1048
1065
error(0, errno, "sigprocmask");
1049
1066
}
1050
1067
exitstatus = EX_OSERR;
1068
free(direntries[i]);
1051
1069
goto fallback;
1052
1070
}
1071
free(direntries[i]);
1053
1072
1054
1073
new_plugin->pid = pid;
1055
1074
new_plugin->fd = pipefd[0];
1065
1084
goto fallback;
1066
1085
}
1067
1086
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1091
#endif
1092
#endif
1068
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
1094
-Wconversion in GNU libc
1095
before 2.16 */
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1099
#endif
1100
#endif
1070
1101
1071
1102
if(maxfd < new_plugin->fd){
1072
1103
maxfd = new_plugin->fd;
1073
1104
}
1074
1105
}
1075
1106
1076
TEMP_FAILURE_RETRY(closedir(dir));
1077
dir = NULL;
1107
free(direntries);
1108
direntries = NULL;
1109
TEMP_FAILURE_RETRY(close(dir_fd));
1110
dir_fd = -1;
1078
1111
free_plugin(getplugin(NULL));
1079
1112
1080
1113
for(plugin *p = plugin_list; p != NULL; p = p->next){
1126
1159
}
1127
1160
1128
1161
/* Remove the plugin */
1162
#if defined (__GNUC__) and defined (__GLIBC__)
1163
#if not __GLIBC_PREREQ(2, 16)
1164
#pragma GCC diagnostic push
1165
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
#endif
1167
#endif
1129
1168
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1169
-Wconversion in GNU libc
1170
before 2.16 */
1171
#if defined (__GNUC__) and defined (__GLIBC__)
1172
#if not __GLIBC_PREREQ(2, 16)
1173
#pragma GCC diagnostic pop
1174
#endif
1175
#endif
1131
1176
1132
1177
/* Block signal while modifying process_list */
1133
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
1218
}
1174
1219
1175
1220
/* This process has not completed. Does it have any output? */
1221
#if defined (__GNUC__) and defined (__GLIBC__)
1222
#if not __GLIBC_PREREQ(2, 16)
1223
#pragma GCC diagnostic push
1224
#pragma GCC diagnostic ignored "-Wsign-conversion"
1225
#endif
1226
#endif
1176
1227
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
1228
warning from
1178
-Wconversion */
1229
-Wconversion
1230
in GNU libc
1231
before
1232
2.16 */
1233
#if defined (__GNUC__) and defined (__GLIBC__)
1234
#if not __GLIBC_PREREQ(2, 16)
1235
#pragma GCC diagnostic pop
1236
#endif
1237
#endif
1179
1238
/* This process had nothing to say at this time */
1180
1239
proc = proc->next;
1181
1240
continue;
1182
1241
}
1183
1242
/* Before reading, make the process' data buffer large enough */
1184
1243
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1244
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1245
+ (size_t) BUFFER_SIZE);
1246
if(new_buffer == NULL){
1188
1247
error(0, errno, "malloc");
1189
1248
exitstatus = EX_OSERR;
1190
1249
goto fallback;
1191
1250
}
1251
proc->buffer = new_buffer;
1192
1252
proc->buffer_size += BUFFER_SIZE;
1193
1253
}
1194
1254
/* Read from the process */
1247
1307
free(custom_argv);
1248
1308
}
1249
1309
1250
if(dir != NULL){
1251
closedir(dir);
1310
free(direntries);
1311
1312
if(dir_fd != -1){
1313
TEMP_FAILURE_RETRY(close(dir_fd));
1252
1314
}
1253
1315
1254
1316
/* Kill the processes */
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0