18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
31
#include <stdio.h> /* fileno(), fprintf(),
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(),
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG(),
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
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(),
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()
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
89
96
size_t buffer_size;
90
97
size_t buffer_length;
92
volatile bool completed;
99
volatile sig_atomic_t completed;
94
101
struct plugin *next;
97
104
static plugin *plugin_list = NULL;
99
/* Gets a existing plugin based on name,
106
/* Gets an existing plugin based on name,
100
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
101
109
static plugin *getplugin(char *name){
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))){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
or (p->name and name and (strcmp(p->name, name) == 0))){
109
117
/* Create a new plugin */
110
plugin *new_plugin = malloc(sizeof(plugin));
111
if (new_plugin == NULL){
118
plugin *new_plugin = NULL;
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
114
125
char *copy_name = NULL;
115
126
if(name != NULL){
116
copy_name = strdup(name);
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
117
130
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
127
new_plugin->argv = malloc(sizeof(char *) * 2);
128
if (new_plugin->argv == NULL){
138
*new_plugin = (plugin){ .name = copy_name,
141
.next = plugin_list };
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
130
149
free(new_plugin);
133
153
new_plugin->argv[0] = copy_name;
134
154
new_plugin->argv[1] = NULL;
136
new_plugin->environ = malloc(sizeof(char *));
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
137
159
if(new_plugin->environ == NULL){
139
162
free(new_plugin->argv);
140
163
free(new_plugin);
143
167
new_plugin->environ[0] = NULL;
344
385
{ .name = "global-options", .key = 'g',
345
386
.arg = "OPTION[,OPTION[,...]]",
346
387
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
388
{ .name = "global-env", .key = 'G',
348
389
.arg = "VAR=value",
349
390
.doc = "Environment variable passed to all plugins" },
350
391
{ .name = "options-for", .key = 'o',
351
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
393
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
394
{ .name = "env-for", .key = 'E',
354
395
.arg = "PLUGIN:ENV=value",
355
396
.doc = "Environment variable passed to specified plugin" },
356
397
{ .name = "disable", .key = 'd',
358
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
402
.doc = "Enable a specific plugin", .group = 1 },
359
403
{ .name = "plugin-dir", .key = 128,
360
404
.arg = "DIRECTORY",
361
405
.doc = "Specify a different plugin directory", .group = 2 },
370
414
.doc = "Group ID the plugins will run as", .group = 3 },
371
415
{ .name = "debug", .key = 132,
372
416
.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 },
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
/* Get the INPUT argument from `argp_parse', which we know is a
379
pointer to our plugin list pointer. */
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
381
435
case 'g': /* --global-options */
384
while((p = strsep(&arg, ",")) != NULL){
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
395
case 'e': /* --global-env */
400
char *envdef = strdup(arg);
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
409
451
case 'o': /* --options-for */
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
415
char *opt = strsep(&arg, ":");
421
while((p = strsep(&opt, ",")) != NULL){
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
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)){
433
case 'f': /* --env-for */
475
case 'E': /* --env-for */
438
477
char *envdef = strchr(arg, ':');
439
478
if(envdef == NULL){
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
479
argp_error(state, "No colon in \"%s\"", arg);
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
486
argp_error(state, "Empty plugin name");
490
if(add_environment(getplugin(arg), envdef, true)){
452
495
case 'd': /* --disable */
454
plugin *p = getplugin(arg);
456
return ARGP_ERR_UNKNOWN;
497
plugin *p = getplugin(arg);
504
case 'e': /* --enable */
506
plugin *p = getplugin(arg);
461
513
case 128: /* --plugin-dir */
462
515
plugindir = strdup(arg);
463
if(plugindir == NULL){
467
case 129: /* --config-file */
516
if(plugindir != NULL){
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
523
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);
534
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);
545
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.
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
574
return ARGP_ERR_UNKNOWN;
576
return errno; /* Set to 0 at start */
579
/* This option parser is the same as parse_opt() above, except it
580
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){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
594
case 129: /* --config-file */
468
596
argfile = strdup(arg);
473
601
case 130: /* --userid */
474
uid = (uid_t)strtol(arg, NULL, 10);
476
602
case 131: /* --groupid */
477
gid = (gid_t)strtol(arg, NULL, 10);
479
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
482
607
case ARGP_KEY_ARG:
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
488
610
return ARGP_ERR_UNKNOWN;
493
struct argp argp = { .options = options, .parser = parse_opt,
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
495
618
.doc = "Mandos plugin runner -- Run plugins" };
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
635
exitstatus = EX_USAGE;
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
497
642
/* Open the configfile if available */
498
if (argfile == NULL){
499
644
conffp = fopen(AFILE, "r");
501
646
conffp = fopen(argfile, "r");
503
648
if(conffp != NULL){
504
649
char *org_line = NULL;
505
650
char *p, *arg, *new_arg, *line;
508
652
const char whitespace_delims[] = " \r\t\f\v\n";
509
653
const char comment_delim[] = "#";
512
656
custom_argv = malloc(sizeof(char*) * 2);
513
657
if(custom_argv == NULL){
515
exitstatus = EXIT_FAILURE;
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
518
662
custom_argv[0] = argv[0];
519
663
custom_argv[1] = NULL;
521
665
/* for each line in the config file, strip whitespace and ignore
522
666
commented text */
535
679
new_arg = strdup(p);
536
680
if(new_arg == NULL){
538
exitstatus = EXIT_FAILURE;
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
543
687
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
548
exitstatus = EXIT_FAILURE;
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;
552
702
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
703
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;
558
716
/* Check for harmful errors and go to fallback. Other errors might
559
717
not affect opening plugins */
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
562
exitstatus = EXIT_FAILURE;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
568
726
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
571
if (ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
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;
578
745
/* Parse actual command line arguments, to let them override the
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
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;
591
768
for(char **a = p->argv; *a != NULL; a++){
592
769
fprintf(stderr, "\tArg: %s\n", *a);
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
595
772
for(char **a = p->environ; *a != NULL; a++){
596
773
fprintf(stderr, "\t%s\n", *a);
601
/* Strip permissions down to nobody */
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");
602
807
ret = setuid(uid);
611
if (plugindir == NULL){
614
dir = opendir(plugindir);
618
perror("Could not open plugin dir");
619
exitstatus = EXIT_FAILURE;
623
/* Set the FD_CLOEXEC flag on the directory, if possible */
809
error(0, errno, "setuid");
812
/* Open plugin directory with close_on_exec flag */
625
int dir_fd = dirfd(dir);
627
ret = set_cloexec_flag(dir_fd);
629
perror("set_cloexec_flag");
630
exitstatus = EXIT_FAILURE;
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
exitstatus = EX_OSERR;
835
#endif /* O_CLOEXEC */
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 };
843
#pragma GCC diagnostic push
844
#pragma GCC diagnostic ignored "-Wcast-qual"
846
for(const char **pat = (const char **)patterns;
847
*pat != NULL; pat++){
849
#pragma GCC diagnostic pop
851
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
854
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
855
" matching pattern %s\n", dirent->d_name, *pat);
864
#if __GLIBC_PREREQ(2, 15)
865
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
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");
878
exitstatus = EX_OSERR;
636
882
FD_ZERO(&rfds_all);
638
884
/* Read and execute any executable in the plugin directory*/
640
dirst = readdir(dir);
642
/* All directory entries have been processed */
646
exitstatus = EXIT_FAILURE;
652
d_name_len = strlen(dirst->d_name);
654
/* Ignore dotfiles, backup files and other junk */
656
bool bad_name = false;
658
const char const *bad_prefixes[] = { ".", "#", NULL };
660
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
662
".dpkg-divert", NULL };
663
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
664
size_t pre_len = strlen(*pre);
665
if((d_name_len >= pre_len)
666
and strncmp((dirst->d_name), *pre, pre_len) == 0){
668
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
669
" with bad prefix %s\n", dirst->d_name, *pre);
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
size_t suf_len = strlen(*suf);
680
if((d_name_len >= suf_len)
681
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
684
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
685
" with bad suffix %s\n", dirst->d_name, *suf);
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
704
ret = stat(filename, &st);
885
for(int i = 0; i < numplugins; i++){
887
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
889
error(0, errno, "Could not open plugin");
892
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
894
error(0, errno, "stat");
895
TEMP_FAILURE_RETRY(close(plugin_fd));
711
899
/* Ignore non-executable files */
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
900
if(not S_ISREG(st.st_mode)
901
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
715
" with bad type or mode\n", filename);
904
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
905
" with bad type or mode\n",
906
plugindir != NULL ? plugindir : PDIR,
907
direntries[i]->d_name);
909
TEMP_FAILURE_RETRY(close(plugin_fd));
721
plugin *p = getplugin(dirst->d_name);
913
plugin *p = getplugin(direntries[i]->d_name);
915
error(0, errno, "getplugin");
916
TEMP_FAILURE_RETRY(close(plugin_fd));
729
921
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
922
direntries[i]->d_name);
924
TEMP_FAILURE_RETRY(close(plugin_fd));
739
931
for(char **a = g->argv + 1; *a != NULL; a++){
740
932
if(not add_argument(p, *a)){
741
perror("add_argument");
933
error(0, errno, "add_argument");
744
936
/* Add global environment variables */
745
937
for(char **e = g->environ; *e != NULL; e++){
746
938
if(not add_environment(p, *e, false)){
747
perror("add_environment");
939
error(0, errno, "add_environment");
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
944
/* If this plugin has any environment variables, we need to
945
duplicate the environment from this process, too. */
755
946
if(p->environ[0] != NULL){
756
947
for(char **e = environ; *e != NULL; e++){
757
948
if(not add_environment(p, *e, false)){
758
perror("add_environment");
949
error(0, errno, "add_environment");
767
exitstatus = EXIT_FAILURE;
956
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
957
#else /* O_CLOEXEC */
958
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
959
#endif /* O_CLOEXEC */
961
error(0, errno, "pipe");
962
exitstatus = EX_OSERR;
965
if(pipefd[0] >= FD_SETSIZE){
966
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
968
TEMP_FAILURE_RETRY(close(pipefd[0]));
969
TEMP_FAILURE_RETRY(close(pipefd[1]));
970
exitstatus = EX_OSERR;
770
974
/* Ask OS to automatic close the pipe on exec */
771
975
ret = set_cloexec_flag(pipefd[0]);
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
TEMP_FAILURE_RETRY(close(pipefd[0]));
979
TEMP_FAILURE_RETRY(close(pipefd[1]));
980
exitstatus = EX_OSERR;
777
983
ret = set_cloexec_flag(pipefd[1]);
779
perror("set_cloexec_flag");
780
exitstatus = EXIT_FAILURE;
985
error(0, errno, "set_cloexec_flag");
986
TEMP_FAILURE_RETRY(close(pipefd[0]));
987
TEMP_FAILURE_RETRY(close(pipefd[1]));
988
exitstatus = EX_OSERR;
991
#endif /* not O_CLOEXEC */
783
992
/* Block SIGCHLD until process is safely in process list */
784
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
993
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
994
&sigchld_action.sa_mask,
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
997
error(0, errno, "sigprocmask");
998
exitstatus = EX_OSERR;
790
1001
/* Starting a new process to be watched */
1005
} while(pid == -1 and errno == EINTR);
794
exitstatus = EXIT_FAILURE;
1007
error(0, errno, "fork");
1008
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1009
&sigchld_action.sa_mask, NULL));
1010
TEMP_FAILURE_RETRY(close(pipefd[0]));
1011
TEMP_FAILURE_RETRY(close(pipefd[1]));
1012
exitstatus = EX_OSERR;
798
1016
/* this is the child process */
799
1017
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1019
error(0, errno, "sigaction");
804
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1022
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
806
perror("sigprocmask");
1024
error(0, errno, "sigprocmask");
810
1028
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1030
error(0, errno, "dup2");
817
/* If dir has no file descriptor, we could not set FD_CLOEXEC
818
above and must now close it manually here. */
821
if(p->environ[0] == NULL){
822
if(execv(filename, p->argv) < 0){
827
if(execve(filename, p->argv, p->environ) < 0){
1034
if(fexecve(plugin_fd, p->argv,
1035
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1036
error(0, errno, "fexecve for %s/%s",
1037
plugindir != NULL ? plugindir : PDIR,
1038
direntries[i]->d_name);
834
1043
/* Parent process */
835
close(pipefd[1]); /* Close unused write end of pipe */
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1046
TEMP_FAILURE_RETRY(close(plugin_fd));
1047
plugin *new_plugin = getplugin(direntries[i]->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
842
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
844
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
878
1107
free_plugin_list();
882
1111
/* Main loop while running plugins exist */
883
1112
while(plugin_list){
884
1113
fd_set rfds = rfds_all;
885
1114
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
886
if (select_ret == -1){
888
exitstatus = EXIT_FAILURE;
1115
if(select_ret == -1 and errno != EINTR){
1116
error(0, errno, "select");
1117
exitstatus = EX_OSERR;
891
1120
/* OK, now either a process completed, or something can be read
892
1121
from one of them */
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1122
for(plugin *proc = plugin_list; proc != NULL;){
894
1123
/* Is this process completely done? */
895
if(proc->eof and proc->completed){
1124
if(proc->completed and proc->eof){
896
1125
/* Only accept the plugin output if it exited cleanly */
897
1126
if(not WIFEXITED(proc->status)
898
1127
or WEXITSTATUS(proc->status) != 0){
899
1128
/* Bad exit by plugin */
902
1131
if(WIFEXITED(proc->status)){
903
fprintf(stderr, "Plugin %u exited with status %d\n",
904
(unsigned int) (proc->pid),
1132
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1133
" status %d\n", proc->name,
1134
(intmax_t) (proc->pid),
905
1135
WEXITSTATUS(proc->status));
906
} else if(WIFSIGNALED(proc->status)) {
907
fprintf(stderr, "Plugin %u killed by signal %d\n",
908
(unsigned int) (proc->pid),
909
WTERMSIG(proc->status));
1136
} else if(WIFSIGNALED(proc->status)){
1137
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1138
" signal %d: %s\n", proc->name,
1139
(intmax_t) (proc->pid),
1140
WTERMSIG(proc->status),
1141
strsignal(WTERMSIG(proc->status)));
910
1142
} else if(WCOREDUMP(proc->status)){
911
fprintf(stderr, "Plugin %d dumped core\n",
912
(unsigned int) (proc->pid));
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1144
" core\n", proc->name, (intmax_t) (proc->pid));
916
1148
/* Remove the plugin */
917
FD_CLR(proc->fd, &rfds_all);
1149
#if defined (__GNUC__) and defined (__GLIBC__)
1150
#if not __GLIBC_PREREQ(2, 16)
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wsign-conversion"
1155
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1156
-Wconversion in GNU libc
1158
#if defined (__GNUC__) and defined (__GLIBC__)
1159
#if not __GLIBC_PREREQ(2, 16)
1160
#pragma GCC diagnostic pop
919
1164
/* Block signal while modifying process_list */
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1165
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1167
&sigchld_action.sa_mask,
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1170
error(0, errno, "sigprocmask");
1171
exitstatus = EX_OSERR;
1175
plugin *next_plugin = proc->next;
926
1176
free_plugin(proc);
927
1179
/* We are done modifying process list, so unblock signal */
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1180
ret = (int)(TEMP_FAILURE_RETRY
1181
(sigprocmask(SIG_UNBLOCK,
1182
&sigchld_action.sa_mask, NULL)));
931
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
1184
error(0, errno, "sigprocmask");
1185
exitstatus = EX_OSERR;
936
1189
if(plugin_list == NULL){
942
1196
/* This process exited nicely, so print its buffer */
944
1198
bool bret = print_out_password(proc->buffer,
945
1199
proc->buffer_length);
947
perror("print_out_password");
948
exitstatus = EXIT_FAILURE;
1201
error(0, errno, "print_out_password");
1202
exitstatus = EX_IOERR;
953
1207
/* This process has not completed. Does it have any output? */
954
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1208
#if defined (__GNUC__) and defined (__GLIBC__)
1209
#if not __GLIBC_PREREQ(2, 16)
1210
#pragma GCC diagnostic push
1211
#pragma GCC diagnostic ignored "-Wsign-conversion"
1214
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1220
#if defined (__GNUC__) and defined (__GLIBC__)
1221
#if not __GLIBC_PREREQ(2, 16)
1222
#pragma GCC diagnostic pop
955
1225
/* This process had nothing to say at this time */
958
1229
/* Before reading, make the process' data buffer large enough */
959
1230
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
960
proc->buffer = realloc(proc->buffer, proc->buffer_size
961
+ (size_t) BUFFER_SIZE);
962
if (proc->buffer == NULL){
964
exitstatus = EXIT_FAILURE;
1231
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1232
+ (size_t) BUFFER_SIZE);
1233
if(new_buffer == NULL){
1234
error(0, errno, "malloc");
1235
exitstatus = EX_OSERR;
1238
proc->buffer = new_buffer;
967
1239
proc->buffer_size += BUFFER_SIZE;
969
1241
/* Read from the process */
970
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1242
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
+ proc->buffer_length,
973
1247
/* Read error from this process; ignore the error */
978
1253
proc->eof = true;
980
proc->buffer_length += (size_t) ret;
1255
proc->buffer_length += (size_t) sret;
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1263
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1264
and exitstatus != EX_OK)){
989
1265
/* Fallback if all plugins failed, none are found or an error
992
1268
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
993
1269
char *passwordbuffer = getpass("Password: ");
994
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1270
size_t len = strlen(passwordbuffer);
1271
/* Strip trailing newline */
1272
if(len > 0 and passwordbuffer[len-1] == '\n'){
1273
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1276
bret = print_out_password(passwordbuffer, len);
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1278
error(0, errno, "print_out_password");
1279
exitstatus = EX_IOERR;
1001
1283
/* Restore old signal handler */
1002
1284
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1286
error(0, errno, "sigaction");
1287
exitstatus = EX_OSERR;
1008
1290
if(custom_argv != NULL){
1009
1291
for(char **arg = custom_argv+1; *arg != NULL; arg++){