19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), 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
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
#include <fnmatch.h> /* fnmatch() */
77
67
#define BUFFER_SIZE 256
79
69
#define PDIR "/lib/mandos/plugins.d"
80
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
85
77
typedef struct plugin{
86
78
char *name; /* can be NULL or any plugin name */
107
99
/* Gets an existing plugin based on name,
108
100
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
101
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
114
or (p->name and name and (strcmp(p->name, name) == 0))){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
104
if ((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
118
109
/* Create a new plugin */
119
plugin *new_plugin = NULL;
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
126
114
char *copy_name = NULL;
127
115
if(name != NULL){
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
131
117
if(copy_name == NULL){
139
*new_plugin = (plugin){ .name = copy_name,
142
.next = plugin_list };
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
150
130
free(new_plugin);
154
133
new_plugin->argv[0] = copy_name;
155
134
new_plugin->argv[1] = NULL;
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
136
new_plugin->environ = malloc(sizeof(char *));
160
137
if(new_plugin->environ == NULL){
163
139
free(new_plugin->argv);
164
140
free(new_plugin);
168
143
new_plugin->environ[0] = NULL;
245
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
208
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
__attribute__((warn_unused_result))
250
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
static int set_cloexec_flag(int fd)
213
int ret = fcntl(fd, F_GETFD, 0);
252
214
/* If reading the flags failed, return error indication now. */
256
218
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
262
223
/* Mark processes as completed when they exit, and save their exit
264
static void handle_sigchld(__attribute__((unused)) int sig){
265
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
267
227
plugin *proc = plugin_list;
414
370
.doc = "Group ID the plugins will run as", .group = 3 },
415
371
{ .name = "debug", .key = 132,
416
372
.doc = "Debug mode", .group = 4 },
418
* These reproduce what we would get without ARGP_NO_HELP
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
435
379
case 'g': /* --global-options */
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
382
while((p = strsep(&arg, ",")) != NULL){
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
446
393
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
451
401
case 'o': /* --options-for */
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
462
argp_error(state, "Empty plugin name");
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0' or opt == NULL){
412
while((p = strsep(&opt, ",")) != NULL){
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
475
423
case 'E': /* --env-for */
477
428
char *envdef = strchr(arg, ':');
478
429
if(envdef == NULL){
479
argp_error(state, "No colon in \"%s\"", arg);
486
argp_error(state, "Empty plugin name");
490
if(add_environment(getplugin(arg), envdef, true)){
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
495
438
case 'd': /* --disable */
497
440
plugin *p = getplugin(arg);
442
return ARGP_ERR_UNKNOWN;
504
447
case 'e': /* --enable */
506
449
plugin *p = getplugin(arg);
451
return ARGP_ERR_UNKNOWN;
513
456
case 128: /* --plugin-dir */
515
458
plugindir = strdup(arg);
516
if(plugindir != NULL){
459
if(plugindir == NULL){
520
463
case 129: /* --config-file */
521
464
/* This is already done by parse_opt_config_file() */
523
466
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
467
uid = (uid_t)strtol(arg, NULL, 10);
534
469
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
470
gid = (gid_t)strtol(arg, NULL, 10);
545
472
case 132: /* --debug */
549
* These reproduce what we would get without ARGP_NO_HELP
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
566
475
case ARGP_KEY_ARG:
567
476
/* Cryptsetup always passes an argument, which is an empty
568
477
string if "none" was specified in /etc/crypttab. So if
569
478
argument was empty, we ignore it silently. */
480
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
574
486
return ARGP_ERR_UNKNOWN;
576
return errno; /* Set to 0 at start */
579
491
/* This option parser is the same as parse_opt() above, except it
580
492
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
493
error_t parse_opt_config_file (int key, char *arg,
494
__attribute__((unused))
495
struct argp_state *state) {
586
497
case 'g': /* --global-options */
587
498
case 'G': /* --global-env */
588
499
case 'o': /* --options-for */
679
579
new_arg = strdup(p);
680
580
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
582
exitstatus = EXIT_FAILURE;
687
587
custom_argc += 1;
689
char **new_argv = realloc(custom_argv, sizeof(char *)
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
699
custom_argv = new_argv;
588
custom_argv = realloc(custom_argv, sizeof(char *)
589
* ((unsigned int) custom_argc + 1));
590
if(custom_argv == NULL){
592
exitstatus = EXIT_FAILURE;
702
596
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
597
custom_argv[custom_argc] = NULL;
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
716
602
/* Check for harmful errors and go to fallback. Other errors might
717
603
not affect opening plugins */
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
604
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
606
exitstatus = EXIT_FAILURE;
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
610
/* If there was any arguments from configuration file,
611
pass them to parser as command arguments */
726
612
if(custom_argv != NULL){
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
740
exitstatus = EX_CONFIG;
613
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
615
if (ret == ARGP_ERR_UNKNOWN){
616
fprintf(stderr, "Unknown error while parsing arguments\n");
617
exitstatus = EXIT_FAILURE;
745
622
/* Parse actual command line arguments, to let them override the
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
760
exitstatus = EX_USAGE;
624
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
625
if (ret == ARGP_ERR_UNKNOWN){
626
fprintf(stderr, "Unknown error while parsing arguments\n");
627
exitstatus = EXIT_FAILURE;
768
635
for(char **a = p->argv; *a != NULL; a++){
769
636
fprintf(stderr, "\tArg: %s\n", *a);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
638
fprintf(stderr, "...and %u environment variables\n", p->envc);
772
639
for(char **a = p->environ; *a != NULL; a++){
773
640
fprintf(stderr, "\t%s\n", *a);
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
784
error(0, errno, "open(\"" PDIR "\")");
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
789
error(0, errno, "fstat");
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
794
error(0, errno, "fchown");
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
802
/* Lower permissions */
805
error(0, errno, "setgid");
645
/* Strip permissions down to nobody */
807
646
ret = setuid(uid);
809
error(0, errno, "setuid");
812
/* Open plugin directory with close_on_exec flag */
655
if (plugindir == NULL){
658
dir = opendir(plugindir);
662
perror("Could not open plugin dir");
663
exitstatus = EXIT_FAILURE;
667
/* Set the FD_CLOEXEC flag on the directory, if possible */
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
817
#else /* not O_CLOEXEC */
819
#endif /* not O_CLOEXEC */
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
836
#endif /* O_CLOEXEC */
838
dir = fdopendir(dir_fd);
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
669
int dir_fd = dirfd(dir);
671
ret = set_cloexec_flag(dir_fd);
673
perror("set_cloexec_flag");
674
exitstatus = EXIT_FAILURE;
849
682
/* Read and execute any executable in the plugin directory*/
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
684
dirst = readdir(dir);
855
686
/* All directory entries have been processed */
856
687
if(dirst == NULL){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
690
exitstatus = EXIT_FAILURE;
696
d_name_len = strlen(dirst->d_name);
865
698
/* Ignore dotfiles, backup files and other junk */
867
700
bool bad_name = false;
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
879
#pragma GCC diagnostic pop
881
if(fnmatch(*pat, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
899
#else /* not O_CLOEXEC */
901
#endif /* not O_CLOEXEC */
904
error(0, errno, "Could not open plugin");
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
702
const char const *bad_prefixes[] = { ".", "#", NULL };
704
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
706
".dpkg-divert", NULL };
707
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
708
size_t pre_len = strlen(*pre);
709
if((d_name_len >= pre_len)
710
and strncmp((dirst->d_name), *pre, pre_len) == 0){
712
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
713
" with bad prefix %s\n", dirst->d_name, *pre);
722
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
723
size_t suf_len = strlen(*suf);
724
if((d_name_len >= suf_len)
725
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad suffix %s\n", dirst->d_name, *suf);
742
if(plugindir == NULL){
743
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
918
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
752
ret = stat(filename, &st);
923
759
/* Ignore non-executable files */
924
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
760
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
762
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
763
" with bad type or mode\n", filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
936
769
plugin *p = getplugin(dirst->d_name);
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
954
787
for(char **a = g->argv + 1; *a != NULL; a++){
955
788
if(not add_argument(p, *a)){
956
error(0, errno, "add_argument");
789
perror("add_argument");
959
792
/* Add global environment variables */
960
793
for(char **e = g->environ; *e != NULL; e++){
961
794
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
795
perror("add_environment");
967
/* If this plugin has any environment variables, we need to
968
duplicate the environment from this process, too. */
800
/* If this plugin has any environment variables, we will call
801
using execve and need to duplicate the environment from this
969
803
if(p->environ[0] != NULL){
970
804
for(char **e = environ; *e != NULL; e++){
971
805
if(not add_environment(p, *e, false)){
972
error(0, errno, "add_environment");
806
perror("add_environment");
978
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
980
error(0, errno, "pipe");
981
exitstatus = EX_OSERR;
984
if(pipefd[0] >= FD_SETSIZE){
985
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
987
TEMP_FAILURE_RETRY(close(pipefd[0]));
988
TEMP_FAILURE_RETRY(close(pipefd[1]));
989
exitstatus = EX_OSERR;
815
exitstatus = EXIT_FAILURE;
992
818
/* Ask OS to automatic close the pipe on exec */
993
819
ret = set_cloexec_flag(pipefd[0]);
995
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
exitstatus = EX_OSERR;
821
perror("set_cloexec_flag");
822
exitstatus = EXIT_FAILURE;
1001
825
ret = set_cloexec_flag(pipefd[1]);
1003
error(0, errno, "set_cloexec_flag");
1004
TEMP_FAILURE_RETRY(close(pipefd[0]));
1005
TEMP_FAILURE_RETRY(close(pipefd[1]));
1006
exitstatus = EX_OSERR;
827
perror("set_cloexec_flag");
828
exitstatus = EXIT_FAILURE;
1009
831
/* Block SIGCHLD until process is safely in process list */
1010
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1011
&sigchld_action.sa_mask,
832
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1014
error(0, errno, "sigprocmask");
1015
exitstatus = EX_OSERR;
834
perror("sigprocmask");
835
exitstatus = EXIT_FAILURE;
1018
838
/* Starting a new process to be watched */
1022
} while(pid == -1 and errno == EINTR);
1024
error(0, errno, "fork");
1025
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1026
&sigchld_action.sa_mask, NULL));
1027
TEMP_FAILURE_RETRY(close(pipefd[0]));
1028
TEMP_FAILURE_RETRY(close(pipefd[1]));
1029
exitstatus = EX_OSERR;
842
exitstatus = EXIT_FAILURE;
1033
846
/* this is the child process */
1034
847
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1036
error(0, errno, "sigaction");
1039
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1041
error(0, errno, "sigprocmask");
854
perror("sigprocmask");
1045
858
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1047
error(0, errno, "dup2");
1051
864
if(dirfd(dir) < 0){
1053
866
above and must now close it manually here. */
1056
if(fexecve(plugin_fd, p->argv,
1057
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1058
error(0, errno, "fexecve for %s/%s",
1059
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
869
if(p->environ[0] == NULL){
870
if(execv(filename, p->argv) < 0){
875
if(execve(filename, p->argv, p->environ) < 0){
1064
882
/* Parent process */
1065
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1067
TEMP_FAILURE_RETRY(close(plugin_fd));
883
close(pipefd[1]); /* Close unused write end of pipe */
1068
885
plugin *new_plugin = getplugin(dirst->d_name);
1069
if(new_plugin == NULL){
1070
error(0, errno, "getplugin");
1071
ret = (int)(TEMP_FAILURE_RETRY
1072
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
886
if (new_plugin == NULL){
888
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1075
error(0, errno, "sigprocmask");
890
perror("sigprocmask");
1077
exitstatus = EX_OSERR;
892
exitstatus = EXIT_FAILURE;
1084
899
/* Unblock SIGCHLD so signal handler can be run if this process
1085
900
has already completed */
1086
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1087
&sigchld_action.sa_mask,
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1090
error(0, errno, "sigprocmask");
1091
exitstatus = EX_OSERR;
903
perror("sigprocmask");
904
exitstatus = EXIT_FAILURE;
1095
#if defined (__GNUC__) and defined (__GLIBC__)
1096
#if not __GLIBC_PREREQ(2, 16)
1097
#pragma GCC diagnostic push
1098
#pragma GCC diagnostic ignored "-Wsign-conversion"
1101
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1102
-Wconversion in GNU libc
1104
#if defined (__GNUC__) and defined (__GLIBC__)
1105
#if not __GLIBC_PREREQ(2, 16)
1106
#pragma GCC diagnostic pop
908
FD_SET(new_plugin->fd, &rfds_all);
1110
if(maxfd < new_plugin->fd){
910
if (maxfd < new_plugin->fd){
1111
911
maxfd = new_plugin->fd;
1115
TEMP_FAILURE_RETRY(closedir(dir));
1117
free_plugin(getplugin(NULL));
1119
919
for(plugin *p = plugin_list; p != NULL; p = p->next){
1120
920
if(p->pid != 0){
1126
926
free_plugin_list();
1130
930
/* Main loop while running plugins exist */
1131
931
while(plugin_list){
1132
932
fd_set rfds = rfds_all;
1133
933
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
934
if (select_ret == -1){
936
exitstatus = EXIT_FAILURE;
1139
939
/* OK, now either a process completed, or something can be read
1140
940
from one of them */
1141
941
for(plugin *proc = plugin_list; proc != NULL;){
1142
942
/* Is this process completely done? */
1143
if(proc->completed and proc->eof){
943
if(proc->eof and proc->completed){
1144
944
/* Only accept the plugin output if it exited cleanly */
1145
945
if(not WIFEXITED(proc->status)
1146
946
or WEXITSTATUS(proc->status) != 0){
1147
947
/* Bad exit by plugin */
1150
950
if(WIFEXITED(proc->status)){
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
951
fprintf(stderr, "Plugin %u exited with status %d\n",
952
(unsigned int) (proc->pid),
1154
953
WEXITSTATUS(proc->status));
1155
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
954
} else if(WIFSIGNALED(proc->status)) {
955
fprintf(stderr, "Plugin %u killed by signal %d\n",
956
(unsigned int) (proc->pid),
957
WTERMSIG(proc->status));
1161
958
} else if(WCOREDUMP(proc->status)){
1162
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1163
" core\n", proc->name, (intmax_t) (proc->pid));
959
fprintf(stderr, "Plugin %d dumped core\n",
960
(unsigned int) (proc->pid));
1167
964
/* Remove the plugin */
1168
#if defined (__GNUC__) and defined (__GLIBC__)
1169
#if not __GLIBC_PREREQ(2, 16)
1170
#pragma GCC diagnostic push
1171
#pragma GCC diagnostic ignored "-Wsign-conversion"
1174
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1175
-Wconversion in GNU libc
1177
#if defined (__GNUC__) and defined (__GLIBC__)
1178
#if not __GLIBC_PREREQ(2, 16)
1179
#pragma GCC diagnostic pop
965
FD_CLR(proc->fd, &rfds_all);
1183
967
/* Block signal while modifying process_list */
1184
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1186
&sigchld_action.sa_mask,
1189
error(0, errno, "sigprocmask");
1190
exitstatus = EX_OSERR;
968
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
970
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
975
/* We are done modifying process list, so unblock signal */
976
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
perror("sigprocmask");
980
exitstatus = EXIT_FAILURE;
984
if(plugin_list == NULL){
1194
988
plugin *next_plugin = proc->next;
1195
989
free_plugin(proc);
1196
990
proc = next_plugin;
1198
/* We are done modifying process list, so unblock signal */
1199
ret = (int)(TEMP_FAILURE_RETRY
1200
(sigprocmask(SIG_UNBLOCK,
1201
&sigchld_action.sa_mask, NULL)));
1203
error(0, errno, "sigprocmask");
1204
exitstatus = EX_OSERR;
1208
if(plugin_list == NULL){
1215
994
/* This process exited nicely, so print its buffer */
1217
996
bool bret = print_out_password(proc->buffer,
1218
997
proc->buffer_length);
1220
error(0, errno, "print_out_password");
1221
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1226
1005
/* This process has not completed. Does it have any output? */
1227
#if defined (__GNUC__) and defined (__GLIBC__)
1228
#if not __GLIBC_PREREQ(2, 16)
1229
#pragma GCC diagnostic push
1230
#pragma GCC diagnostic ignored "-Wsign-conversion"
1233
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1239
#if defined (__GNUC__) and defined (__GLIBC__)
1240
#if not __GLIBC_PREREQ(2, 16)
1241
#pragma GCC diagnostic pop
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1244
1007
/* This process had nothing to say at this time */
1245
1008
proc = proc->next;
1248
1011
/* Before reading, make the process' data buffer large enough */
1249
1012
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1250
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1251
+ (size_t) BUFFER_SIZE);
1252
if(new_buffer == NULL){
1253
error(0, errno, "malloc");
1254
exitstatus = EX_OSERR;
1013
proc->buffer = realloc(proc->buffer, proc->buffer_size
1014
+ (size_t) BUFFER_SIZE);
1015
if (proc->buffer == NULL){
1017
exitstatus = EXIT_FAILURE;
1257
proc->buffer = new_buffer;
1258
1020
proc->buffer_size += BUFFER_SIZE;
1260
1022
/* Read from the process */
1261
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1263
+ proc->buffer_length,
1023
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1266
1026
/* Read error from this process; ignore the error */
1267
1027
proc = proc->next;
1272
1032
proc->eof = true;
1274
proc->buffer_length += (size_t) sret;
1034
proc->buffer_length += (size_t) ret;
1282
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1283
and exitstatus != EX_OK)){
1042
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1284
1043
/* Fallback if all plugins failed, none are found or an error