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(),
409
377
.doc = "Group ID the plugins will run as", .group = 3 },
410
378
{ .name = "debug", .key = 132,
411
379
.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){
383
error_t parse_opt(int key, char *arg, __attribute__((unused))
384
struct argp_state *state){
430
387
case 'g': /* --global-options */
432
389
char *plugin_option;
433
390
while((plugin_option = strsep(&arg, ",")) != NULL){
391
if(plugin_option[0] == '\0'){
434
394
if(not add_argument(getplugin(NULL), plugin_option)){
395
perror("add_argument");
396
return ARGP_ERR_UNKNOWN;
440
401
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
405
if(not add_environment(getplugin(NULL), arg, true)){
406
perror("add_environment");
443
409
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)){
411
char *plugin_name = strsep(&arg, ":");
412
if(plugin_name[0] == '\0'){
416
while((plugin_option = strsep(&arg, ",")) != NULL){
417
if(not add_argument(getplugin(plugin_name), plugin_option)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
466
424
case 'E': /* --env-for */
468
429
char *envdef = strchr(arg, ':');
469
430
if(envdef == NULL){
470
argp_error(state, "No colon in \"%s\"", arg);
477
argp_error(state, "Empty plugin name");
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
481
add_environment(getplugin(arg), envdef, true);
484
439
case 'd': /* --disable */
486
441
plugin *p = getplugin(arg);
443
return ARGP_ERR_UNKNOWN;
492
448
case 'e': /* --enable */
494
450
plugin *p = getplugin(arg);
452
return ARGP_ERR_UNKNOWN;
500
457
case 128: /* --plugin-dir */
502
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
504
464
case 129: /* --config-file */
505
465
/* This is already done by parse_opt_config_file() */
507
467
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
469
tmpmax = strtoimax(arg, &tmp, 10);
509
470
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);
471
or tmpmax != (uid_t)tmpmax){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
517
478
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
480
tmpmax = strtoimax(arg, &tmp, 10);
519
481
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);
482
or tmpmax != (gid_t)tmpmax){
483
fprintf(stderr, "Bad group ID number: \"%s\", using %"
484
PRIdMAX "\n", arg, (intmax_t)gid);
527
489
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
493
* When adding more options before this line, remember to also add a
546
494
* "case" to the "parse_opt_config_file" function below.
676
617
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
622
/* Check for harmful errors and go to fallback. Other errors might
690
623
not affect opening plugins */
691
624
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
626
exitstatus = EXIT_FAILURE;
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
630
/* If there was any arguments from configuration file,
631
pass them to parser as command arguments */
699
632
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;
633
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
if(ret == ARGP_ERR_UNKNOWN){
636
fprintf(stderr, "Unknown error while parsing arguments\n");
637
exitstatus = EXIT_FAILURE;
718
642
/* 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;
644
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
645
if(ret == ARGP_ERR_UNKNOWN){
646
fprintf(stderr, "Unknown error while parsing arguments\n");
647
exitstatus = EXIT_FAILURE;
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 */
665
/* Strip permissions down to nobody */
776
error(0, errno, "setgid");
778
670
ret = setuid(uid);
780
error(0, errno, "setuid");
783
/* Open plugin directory with close_on_exec flag */
675
if(plugindir == NULL){
678
dir = opendir(plugindir);
682
perror("Could not open plugin dir");
683
exitstatus = EXIT_FAILURE;
687
/* 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;
689
int dir_fd = dirfd(dir);
691
ret = set_cloexec_flag(dir_fd);
693
perror("set_cloexec_flag");
694
exitstatus = EXIT_FAILURE;
894
763
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
764
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
766
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
903
error(0, errno, "asprintf");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
773
ret = stat(filename, &st);
909
error(0, errno, "stat");
914
780
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
781
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
918
783
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
919
784
" with bad type or mode\n", filename);
959
824
if(p->environ[0] != NULL){
960
825
for(char **e = environ; *e != NULL; e++){
961
826
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
827
perror("add_environment");
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
836
exitstatus = EXIT_FAILURE;
974
839
/* Ask OS to automatic close the pipe on exec */
975
840
ret = set_cloexec_flag(pipefd[0]);
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
981
846
ret = set_cloexec_flag(pipefd[1]);
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
848
perror("set_cloexec_flag");
849
exitstatus = EXIT_FAILURE;
987
852
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
853
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
996
859
/* Starting a new process to be watched */
1000
} while(pid == -1 and errno == EINTR);
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
863
exitstatus = EXIT_FAILURE;
1007
867
/* this is the child process */
1008
868
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1010
error(0, errno, "sigaction");
1013
873
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1015
error(0, errno, "sigprocmask");
875
perror("sigprocmask");
1019
879
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1021
error(0, errno, "dup2");
1025
885
if(dirfd(dir) < 0){
1030
890
if(p->environ[0] == NULL){
1031
891
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1036
896
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
1043
903
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
904
close(pipefd[1]); /* Close unused write end of pipe */
1047
906
plugin *new_plugin = getplugin(dirst->d_name);
1048
907
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
909
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
error(0, errno, "sigprocmask");
911
perror("sigprocmask");
1056
exitstatus = EX_OSERR;
913
exitstatus = EXIT_FAILURE;