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> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
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(),
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(),
40
WEXITSTATUS(), WTERMSIG(),
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
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()
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(),
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
64
SIG_UNBLOCK, kill() */
68
65
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
76
67
#define BUFFER_SIZE 256
78
69
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
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 */
97
89
size_t buffer_size;
98
90
size_t buffer_length;
100
volatile sig_atomic_t completed;
92
volatile bool completed;
102
94
struct plugin *next;
105
97
static plugin *plugin_list = NULL;
107
/* Gets an existing plugin based on name,
99
/* Gets a 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 };
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == 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){
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;
241
203
return add_to_char_array(def, &(p->environ), &(p->envc));
246
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
208
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
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);
253
214
/* If reading the flags failed, return error indication now. */
257
218
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
261
#endif /* not O_CLOEXEC */
264
223
/* Mark processes as completed when they exit, and save their exit
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
225
void handle_sigchld(__attribute__((unused)) int sig){
269
227
plugin *proc = plugin_list;
416
373
.doc = "Group ID the plugins will run as", .group = 3 },
417
374
{ .name = "debug", .key = 132,
418
375
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
421
.doc = "Specify a different plugin helper directory",
424
* These reproduce what we would get without ARGP_NO_HELP
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
441
382
case 'g': /* --global-options */
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
385
while((p = strsep(&arg, ",")) != NULL){
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
452
396
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
401
char *envdef = strdup(arg);
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
457
410
case 'o': /* --options-for */
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
468
argp_error(state, "Empty plugin name");
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0'){
416
char *opt = strsep(&arg, ":");
422
while((p = strsep(&opt, ",")) != NULL){
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
481
434
case 'E': /* --env-for */
483
439
char *envdef = strchr(arg, ':');
484
440
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
492
argp_error(state, "Empty plugin name");
496
if(add_environment(getplugin(arg), envdef, true)){
448
if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
501
453
case 'd': /* --disable */
503
455
plugin *p = getplugin(arg);
457
return ARGP_ERR_UNKNOWN;
510
462
case 'e': /* --enable */
512
464
plugin *p = getplugin(arg);
466
return ARGP_ERR_UNKNOWN;
519
471
case 128: /* --plugin-dir */
521
472
plugindir = strdup(arg);
522
if(plugindir != NULL){
473
if(plugindir == NULL){
526
477
case 129: /* --config-file */
527
478
/* This is already done by parse_opt_config_file() */
529
480
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
481
uid = (uid_t)strtol(arg, NULL, 10);
540
483
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
484
gid = (gid_t)strtol(arg, NULL, 10);
551
486
case 132: /* --debug */
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
562
* These reproduce what we would get without ARGP_NO_HELP
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
579
489
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
490
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
587
495
return ARGP_ERR_UNKNOWN;
589
return errno; /* Set to 0 at start */
592
500
/* This option parser is the same as parse_opt() above, except it
593
501
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
599
506
case 'g': /* --global-options */
600
507
case 'G': /* --global-env */
601
508
case 'o': /* --options-for */
693
587
new_arg = strdup(p);
694
588
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
590
exitstatus = EXIT_FAILURE;
701
595
custom_argc += 1;
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
712
custom_argv = new_argv;
596
custom_argv = realloc(custom_argv, sizeof(char *)
597
* ((unsigned int) custom_argc + 1));
598
if(custom_argv == NULL){
600
exitstatus = EXIT_FAILURE;
715
604
custom_argv[custom_argc-1] = new_arg;
716
custom_argv[custom_argc] = NULL;
605
custom_argv[custom_argc] = NULL;
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
729
610
/* Check for harmful errors and go to fallback. Other errors might
730
611
not affect opening plugins */
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
614
exitstatus = EXIT_FAILURE;
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
618
/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
739
620
if(custom_argv != NULL){
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
753
exitstatus = EX_CONFIG;
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
758
630
/* Parse actual command line arguments, to let them override the
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
773
exitstatus = EX_USAGE;
778
char *pluginhelperenv;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
791
free(pluginhelperenv);
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
799
643
for(char **a = p->argv; *a != NULL; a++){
800
644
fprintf(stderr, "\tArg: %s\n", *a);
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
646
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
647
for(char **a = p->environ; *a != NULL; a++){
804
648
fprintf(stderr, "\t%s\n", *a);
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
815
error(0, errno, "open(\"" PDIR "\")");
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
error(0, errno, "fstat");
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
825
error(0, errno, "fchown");
833
/* Lower permissions */
836
error(0, errno, "setgid");
653
/* Strip permissions down to nobody */
838
654
ret = setuid(uid);
840
error(0, errno, "setuid");
843
/* Open plugin directory with close_on_exec flag */
663
if (plugindir == NULL){
666
dir = opendir(plugindir);
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
848
#else /* not O_CLOEXEC */
850
#endif /* not O_CLOEXEC */
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
866
#endif /* O_CLOEXEC */
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
880
#pragma GCC diagnostic pop
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
677
int dir_fd = dirfd(dir);
679
ret = set_cloexec_flag(dir_fd);
681
perror("set_cloexec_flag");
682
exitstatus = EXIT_FAILURE;
895
#if __GLIBC_PREREQ(2, 15)
896
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
#else /* not __GLIBC_PREREQ(2, 15) */
899
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
900
&direntries, good_name, alphasort);
901
#endif /* not __GLIBC_PREREQ(2, 15) */
902
#else /* not __GLIBC__ */
903
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
904
&direntries, good_name, alphasort);
905
#endif /* not __GLIBC__ */
906
if(numplugins == -1){
907
error(0, errno, "Could not scan plugin dir");
909
exitstatus = EX_OSERR;
913
688
FD_ZERO(&rfds_all);
915
690
/* Read and execute any executable in the plugin directory*/
916
for(int i = 0; i < numplugins; i++){
918
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
920
error(0, errno, "Could not open plugin");
924
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
926
error(0, errno, "stat");
692
dirst = readdir(dir);
694
/* All directory entries have been processed */
698
exitstatus = EXIT_FAILURE;
704
d_name_len = strlen(dirst->d_name);
706
/* Ignore dotfiles, backup files and other junk */
708
bool bad_name = false;
710
const char const *bad_prefixes[] = { ".", "#", NULL };
712
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
714
".dpkg-divert", NULL };
715
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
716
size_t pre_len = strlen(*pre);
717
if((d_name_len >= pre_len)
718
and strncmp((dirst->d_name), *pre, pre_len) == 0){
720
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
721
" with bad prefix %s\n", dirst->d_name, *pre);
730
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
731
size_t suf_len = strlen(*suf);
732
if((d_name_len >= suf_len)
733
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
736
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
737
" with bad suffix %s\n", dirst->d_name, *suf);
750
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
756
ret = stat(filename, &st);
932
763
/* Ignore non-executable files */
933
if(not S_ISREG(st.st_mode)
934
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
764
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
937
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
938
" with bad type or mode\n",
939
plugindir != NULL ? plugindir : PDIR,
940
direntries[i]->d_name);
766
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
767
" with bad type or mode\n", filename);
947
plugin *p = getplugin(direntries[i]->d_name);
773
plugin *p = getplugin(dirst->d_name);
949
error(0, errno, "getplugin");
956
781
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
957
direntries[i]->d_name);
967
791
for(char **a = g->argv + 1; *a != NULL; a++){
968
792
if(not add_argument(p, *a)){
969
error(0, errno, "add_argument");
793
perror("add_argument");
972
796
/* Add global environment variables */
973
797
for(char **e = g->environ; *e != NULL; e++){
974
798
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
799
perror("add_environment");
980
/* If this plugin has any environment variables, we need to
981
duplicate the environment from this process, too. */
804
/* If this plugin has any environment variables, we will call
805
using execve and need to duplicate the environment from this
982
807
if(p->environ[0] != NULL){
983
808
for(char **e = environ; *e != NULL; e++){
984
809
if(not add_environment(p, *e, false)){
985
error(0, errno, "add_environment");
810
perror("add_environment");
992
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
993
#else /* O_CLOEXEC */
994
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
995
#endif /* O_CLOEXEC */
997
error(0, errno, "pipe");
998
exitstatus = EX_OSERR;
1002
if(pipefd[0] >= FD_SETSIZE){
1003
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
819
exitstatus = EXIT_FAILURE;
1012
822
/* Ask OS to automatic close the pipe on exec */
1013
823
ret = set_cloexec_flag(pipefd[0]);
1015
error(0, errno, "set_cloexec_flag");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
825
perror("set_cloexec_flag");
826
exitstatus = EXIT_FAILURE;
1022
829
ret = set_cloexec_flag(pipefd[1]);
1024
error(0, errno, "set_cloexec_flag");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
831
perror("set_cloexec_flag");
832
exitstatus = EXIT_FAILURE;
1031
#endif /* not O_CLOEXEC */
1032
835
/* Block SIGCHLD until process is safely in process list */
1033
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1034
&sigchld_action.sa_mask,
836
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1037
error(0, errno, "sigprocmask");
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
838
perror("sigprocmask");
839
exitstatus = EXIT_FAILURE;
1042
842
/* Starting a new process to be watched */
1046
} while(pid == -1 and errno == EINTR);
1048
error(0, errno, "fork");
1049
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1050
&sigchld_action.sa_mask, NULL));
1053
exitstatus = EX_OSERR;
1054
free(direntries[i]);
846
exitstatus = EXIT_FAILURE;
1058
850
/* this is the child process */
1059
851
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
error(0, errno, "sigaction");
1064
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
856
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1066
error(0, errno, "sigprocmask");
858
perror("sigprocmask");
1070
862
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1072
error(0, errno, "dup2");
1076
if(fexecve(plugin_fd, p->argv,
1077
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1078
error(0, errno, "fexecve for %s/%s",
1079
plugindir != NULL ? plugindir : PDIR,
1080
direntries[i]->d_name);
869
/* If dir has no file descriptor, we could not set FD_CLOEXEC
870
above and must now close it manually here. */
873
if(p->environ[0] == NULL){
874
if(execv(filename, p->argv) < 0){
879
if(execve(filename, p->argv, p->environ) < 0){
1085
886
/* Parent process */
1086
887
close(pipefd[1]); /* Close unused write end of pipe */
1088
plugin *new_plugin = getplugin(direntries[i]->d_name);
1089
if(new_plugin == NULL){
1090
error(0, errno, "getplugin");
1091
ret = (int)(TEMP_FAILURE_RETRY
1092
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
889
plugin *new_plugin = getplugin(dirst->d_name);
890
if (new_plugin == NULL){
892
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1095
error(0, errno, "sigprocmask");
894
perror("sigprocmask");
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
896
exitstatus = EXIT_FAILURE;
1101
free(direntries[i]);
1103
900
new_plugin->pid = pid;
1104
901
new_plugin->fd = pipefd[0];
1106
903
/* Unblock SIGCHLD so signal handler can be run if this process
1107
904
has already completed */
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1109
&sigchld_action.sa_mask,
905
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1112
error(0, errno, "sigprocmask");
1113
exitstatus = EX_OSERR;
907
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
1117
#if defined (__GNUC__) and defined (__GLIBC__)
1118
#if not __GLIBC_PREREQ(2, 16)
1119
#pragma GCC diagnostic push
1120
#pragma GCC diagnostic ignored "-Wsign-conversion"
1123
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1124
-Wconversion in GNU libc
1126
#if defined (__GNUC__) and defined (__GLIBC__)
1127
#if not __GLIBC_PREREQ(2, 16)
1128
#pragma GCC diagnostic pop
912
FD_SET(new_plugin->fd, &rfds_all);
1132
if(maxfd < new_plugin->fd){
914
if (maxfd < new_plugin->fd){
1133
915
maxfd = new_plugin->fd;
1141
free_plugin(getplugin(NULL));
1143
923
for(plugin *p = plugin_list; p != NULL; p = p->next){
1144
924
if(p->pid != 0){
1150
930
free_plugin_list();
1154
934
/* Main loop while running plugins exist */
1155
935
while(plugin_list){
1156
936
fd_set rfds = rfds_all;
1157
937
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1158
if(select_ret == -1 and errno != EINTR){
1159
error(0, errno, "select");
1160
exitstatus = EX_OSERR;
938
if (select_ret == -1){
940
exitstatus = EXIT_FAILURE;
1163
943
/* OK, now either a process completed, or something can be read
1164
944
from one of them */
1165
for(plugin *proc = plugin_list; proc != NULL;){
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1166
946
/* Is this process completely done? */
1167
if(proc->completed and proc->eof){
947
if(proc->eof and proc->completed){
1168
948
/* Only accept the plugin output if it exited cleanly */
1169
949
if(not WIFEXITED(proc->status)
1170
950
or WEXITSTATUS(proc->status) != 0){
1171
951
/* Bad exit by plugin */
1174
954
if(WIFEXITED(proc->status)){
1175
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1176
" status %d\n", proc->name,
1177
(intmax_t) (proc->pid),
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1178
957
WEXITSTATUS(proc->status));
1179
} else if(WIFSIGNALED(proc->status)){
1180
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1181
" signal %d: %s\n", proc->name,
1182
(intmax_t) (proc->pid),
1183
WTERMSIG(proc->status),
1184
strsignal(WTERMSIG(proc->status)));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
WTERMSIG(proc->status));
1185
962
} else if(WCOREDUMP(proc->status)){
1186
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1187
" core\n", proc->name, (intmax_t) (proc->pid));
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1191
968
/* Remove the plugin */
1192
#if defined (__GNUC__) and defined (__GLIBC__)
1193
#if not __GLIBC_PREREQ(2, 16)
1194
#pragma GCC diagnostic push
1195
#pragma GCC diagnostic ignored "-Wsign-conversion"
1198
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1199
-Wconversion in GNU libc
1201
#if defined (__GNUC__) and defined (__GLIBC__)
1202
#if not __GLIBC_PREREQ(2, 16)
1203
#pragma GCC diagnostic pop
969
FD_CLR(proc->fd, &rfds_all);
1207
971
/* Block signal while modifying process_list */
1208
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1210
&sigchld_action.sa_mask,
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1213
error(0, errno, "sigprocmask");
1214
exitstatus = EX_OSERR;
974
perror("sigprocmask");
975
exitstatus = EXIT_FAILURE;
1218
plugin *next_plugin = proc->next;
1219
978
free_plugin(proc);
1222
979
/* We are done modifying process list, so unblock signal */
1223
ret = (int)(TEMP_FAILURE_RETRY
1224
(sigprocmask(SIG_UNBLOCK,
1225
&sigchld_action.sa_mask, NULL)));
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1227
error(0, errno, "sigprocmask");
1228
exitstatus = EX_OSERR;
983
perror("sigprocmask");
984
exitstatus = EXIT_FAILURE;
1232
988
if(plugin_list == NULL){
1239
994
/* This process exited nicely, so print its buffer */
1241
996
bool bret = print_out_password(proc->buffer,
1242
997
proc->buffer_length);
1244
error(0, errno, "print_out_password");
1245
exitstatus = EX_IOERR;
999
perror("print_out_password");
1000
exitstatus = EXIT_FAILURE;
1250
1005
/* This process has not completed. Does it have any output? */
1251
#if defined (__GNUC__) and defined (__GLIBC__)
1252
#if not __GLIBC_PREREQ(2, 16)
1253
#pragma GCC diagnostic push
1254
#pragma GCC diagnostic ignored "-Wsign-conversion"
1257
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1263
#if defined (__GNUC__) and defined (__GLIBC__)
1264
#if not __GLIBC_PREREQ(2, 16)
1265
#pragma GCC diagnostic pop
1006
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1268
1007
/* This process had nothing to say at this time */
1272
1010
/* Before reading, make the process' data buffer large enough */
1273
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1274
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1275
+ (size_t) BUFFER_SIZE);
1276
if(new_buffer == NULL){
1277
error(0, errno, "malloc");
1278
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1016
exitstatus = EXIT_FAILURE;
1281
proc->buffer = new_buffer;
1282
1019
proc->buffer_size += BUFFER_SIZE;
1284
1021
/* Read from the process */
1285
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1287
+ proc->buffer_length,
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1290
1025
/* Read error from this process; ignore the error */
1296
1030
proc->eof = true;
1298
proc->buffer_length += (size_t) sret;
1032
proc->buffer_length += (size_t) ret;
1306
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1307
and exitstatus != EX_OK)){
1040
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1308
1041
/* Fallback if all plugins failed, none are found or an error
1311
1044
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1312
1045
char *passwordbuffer = getpass("Password: ");
1313
size_t len = strlen(passwordbuffer);
1314
/* Strip trailing newline */
1315
if(len > 0 and passwordbuffer[len-1] == '\n'){
1316
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1319
bret = print_out_password(passwordbuffer, len);
1046
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1321
error(0, errno, "print_out_password");
1322
exitstatus = EX_IOERR;
1048
perror("print_out_password");
1049
exitstatus = EXIT_FAILURE;
1326
1053
/* Restore old signal handler */
1327
1054
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1329
error(0, errno, "sigaction");
1330
exitstatus = EX_OSERR;
1056
perror("sigaction");
1057
exitstatus = EXIT_FAILURE;
1333
1060
if(custom_argv != NULL){
1334
1061
for(char **arg = custom_argv+1; *arg != NULL; arg++){