19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
106
98
/* Gets an existing plugin based on name,
107
99
or if none is found, creates a new one */
108
100
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
or (p->name and name and (strcmp(p->name, name) == 0))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
116
108
/* Create a new plugin */
117
plugin *new_plugin = NULL;
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
124
113
char *copy_name = NULL;
125
114
if(name != NULL){
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
129
116
if(copy_name == NULL){
137
*new_plugin = (plugin){ .name = copy_name,
140
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
148
129
free(new_plugin);
152
132
new_plugin->argv[0] = copy_name;
153
133
new_plugin->argv[1] = NULL;
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
158
136
if(new_plugin->environ == NULL){
161
138
free(new_plugin->argv);
162
139
free(new_plugin);
166
142
new_plugin->environ[0] = NULL;
409
369
.doc = "Group ID the plugins will run as", .group = 3 },
410
370
{ .name = "debug", .key = 132,
411
371
.doc = "Debug mode", .group = 4 },
413
* These reproduce what we would get without ARGP_NO_HELP
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
430
378
case 'g': /* --global-options */
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
381
while((p = strsep(&arg, ",")) != NULL){
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
440
392
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
443
400
case 'o': /* --options-for */
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
454
argp_error(state, "Empty plugin name");
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
411
while((p = strsep(&opt, ",")) != NULL){
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
466
422
case 'E': /* --env-for */
468
427
char *envdef = strchr(arg, ':');
469
428
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
477
argp_error(state, "Empty plugin name");
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
481
add_environment(getplugin(arg), envdef, true);
484
437
case 'd': /* --disable */
486
439
plugin *p = getplugin(arg);
441
return ARGP_ERR_UNKNOWN;
492
446
case 'e': /* --enable */
494
448
plugin *p = getplugin(arg);
450
return ARGP_ERR_UNKNOWN;
500
455
case 128: /* --plugin-dir */
502
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
504
462
case 129: /* --config-file */
505
463
/* This is already done by parse_opt_config_file() */
507
465
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
517
473
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
527
481
case 132: /* --debug */
531
* These reproduce what we would get without ARGP_NO_HELP
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
545
485
* When adding more options before this line, remember to also add a
546
486
* "case" to the "parse_opt_config_file" function below.
667
600
custom_argv = realloc(custom_argv, sizeof(char *)
668
601
* ((unsigned int) custom_argc + 1));
669
602
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
604
exitstatus = EXIT_FAILURE;
675
608
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
609
custom_argv[custom_argc] = NULL;
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
689
614
/* Check for harmful errors and go to fallback. Other errors might
690
615
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
618
exitstatus = EXIT_FAILURE;
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
699
624
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
713
exitstatus = EX_CONFIG;
625
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
627
if (ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
718
634
/* Parse actual command line arguments, to let them override the
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
733
exitstatus = EX_USAGE;
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
741
647
for(char **a = p->argv; *a != NULL; a++){
742
648
fprintf(stderr, "\tArg: %s\n", *a);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
745
651
for(char **a = p->environ; *a != NULL; a++){
746
652
fprintf(stderr, "\t%s\n", *a);
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
760
error(0, errno, "fstat");
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
765
error(0, errno, "fchown");
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
773
/* Lower permissions */
776
error(0, errno, "setgid");
657
/* Strip permissions down to nobody */
778
658
ret = setuid(uid);
780
error(0, errno, "setuid");
783
/* Open plugin directory with close_on_exec flag */
667
if (plugindir == NULL){
670
dir = opendir(plugindir);
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
790
#else /* not O_CLOEXEC */
792
#endif /* not O_CLOEXEC */
795
dir_fd = open(plugindir, O_RDONLY |
798
#else /* not O_CLOEXEC */
800
#endif /* not O_CLOEXEC */
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
818
#endif /* O_CLOEXEC */
820
dir = fdopendir(dir_fd);
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
681
int dir_fd = dirfd(dir);
683
ret = set_cloexec_flag(dir_fd);
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
902
755
if(plugindir == NULL){
903
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
906
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
911
error(0, errno, "asprintf");
915
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
917
error(0, errno, "stat");
765
ret = stat(filename, &st);
922
772
/* Ignore non-executable files */
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
926
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
927
776
" with bad type or mode\n", filename);
967
816
if(p->environ[0] != NULL){
968
817
for(char **e = environ; *e != NULL; e++){
969
818
if(not add_environment(p, *e, false)){
970
error(0, errno, "add_environment");
819
perror("add_environment");
976
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
978
error(0, errno, "pipe");
979
exitstatus = EX_OSERR;
828
exitstatus = EXIT_FAILURE;
982
831
/* Ask OS to automatic close the pipe on exec */
983
832
ret = set_cloexec_flag(pipefd[0]);
985
error(0, errno, "set_cloexec_flag");
986
exitstatus = EX_OSERR;
834
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
989
838
ret = set_cloexec_flag(pipefd[1]);
991
error(0, errno, "set_cloexec_flag");
992
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
995
844
/* Block SIGCHLD until process is safely in process list */
996
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
997
&sigchld_action.sa_mask,
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1000
error(0, errno, "sigprocmask");
1001
exitstatus = EX_OSERR;
847
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
1004
851
/* Starting a new process to be watched */
1008
} while(pid == -1 and errno == EINTR);
1010
error(0, errno, "fork");
1011
exitstatus = EX_OSERR;
855
exitstatus = EXIT_FAILURE;
1015
859
/* this is the child process */
1016
860
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1018
error(0, errno, "sigaction");
1021
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
error(0, errno, "sigprocmask");
867
perror("sigprocmask");
1027
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1029
error(0, errno, "dup2");
1033
877
if(dirfd(dir) < 0){
1038
882
if(p->environ[0] == NULL){
1039
883
if(execv(filename, p->argv) < 0){
1040
error(0, errno, "execv for %s", filename);
1044
888
if(execve(filename, p->argv, p->environ) < 0){
1045
error(0, errno, "execve for %s", filename);
1051
895
/* Parent process */
1052
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
896
close(pipefd[1]); /* Close unused write end of pipe */
1055
898
plugin *new_plugin = getplugin(dirst->d_name);
1056
if(new_plugin == NULL){
1057
error(0, errno, "getplugin");
1058
ret = (int)(TEMP_FAILURE_RETRY
1059
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
899
if (new_plugin == NULL){
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
error(0, errno, "sigprocmask");
903
perror("sigprocmask");
1064
exitstatus = EX_OSERR;
905
exitstatus = EXIT_FAILURE;
1071
912
/* Unblock SIGCHLD so signal handler can be run if this process
1072
913
has already completed */
1073
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1074
&sigchld_action.sa_mask,
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1077
error(0, errno, "sigprocmask");
1078
exitstatus = EX_OSERR;
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
1082
#if defined (__GNUC__) and defined (__GLIBC__)
1083
#if not __GLIBC_PREREQ(2, 16)
1084
#pragma GCC diagnostic push
1085
#pragma GCC diagnostic ignored "-Wsign-conversion"
1088
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1089
-Wconversion in GNU libc
1091
#if defined (__GNUC__) and defined (__GLIBC__)
1092
#if not __GLIBC_PREREQ(2, 16)
1093
#pragma GCC diagnostic pop
921
FD_SET(new_plugin->fd, &rfds_all);
1097
if(maxfd < new_plugin->fd){
923
if (maxfd < new_plugin->fd){
1098
924
maxfd = new_plugin->fd;
1102
TEMP_FAILURE_RETRY(closedir(dir));
1104
free_plugin(getplugin(NULL));
1106
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
1107
932
if(p->pid != 0){
1118
943
while(plugin_list){
1119
944
fd_set rfds = rfds_all;
1120
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1121
if(select_ret == -1 and errno != EINTR){
1122
error(0, errno, "select");
1123
exitstatus = EX_OSERR;
946
if (select_ret == -1){
948
exitstatus = EXIT_FAILURE;
1126
951
/* OK, now either a process completed, or something can be read
1127
952
from one of them */
1128
953
for(plugin *proc = plugin_list; proc != NULL;){
1129
954
/* Is this process completely done? */
1130
if(proc->completed and proc->eof){
955
if(proc->eof and proc->completed){
1131
956
/* Only accept the plugin output if it exited cleanly */
1132
957
if(not WIFEXITED(proc->status)
1133
958
or WEXITSTATUS(proc->status) != 0){
1134
959
/* Bad exit by plugin */
1137
962
if(WIFEXITED(proc->status)){
1138
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1139
" status %d\n", proc->name,
1140
(intmax_t) (proc->pid),
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1141
965
WEXITSTATUS(proc->status));
1142
} else if(WIFSIGNALED(proc->status)){
1143
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1144
" signal %d: %s\n", proc->name,
1145
(intmax_t) (proc->pid),
1146
WTERMSIG(proc->status),
1147
strsignal(WTERMSIG(proc->status)));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1148
970
} else if(WCOREDUMP(proc->status)){
1149
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1150
" core\n", proc->name, (intmax_t) (proc->pid));
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1154
976
/* Remove the plugin */
1155
#if defined (__GNUC__) and defined (__GLIBC__)
1156
#if not __GLIBC_PREREQ(2, 16)
1157
#pragma GCC diagnostic push
1158
#pragma GCC diagnostic ignored "-Wsign-conversion"
1161
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1162
-Wconversion in GNU libc
1164
#if defined (__GNUC__) and defined (__GLIBC__)
1165
#if not __GLIBC_PREREQ(2, 16)
1166
#pragma GCC diagnostic pop
977
FD_CLR(proc->fd, &rfds_all);
1170
979
/* Block signal while modifying process_list */
1171
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
&sigchld_action.sa_mask,
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1176
error(0, errno, "sigprocmask");
1177
exitstatus = EX_OSERR;
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;