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(),
404
393
.doc = "Group ID the plugins will run as", .group = 3 },
405
394
{ .name = "debug", .key = 132,
406
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.doc = "Debug mode", .group = 4 },
408
* These reproduce what we would get without ARGP_NO_HELP
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
424
404
case 'g': /* --global-options */
426
406
char *plugin_option;
427
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
428
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if(not add_argument(getplugin(NULL), plugin_option)){
412
perror("add_argument");
413
return ARGP_ERR_UNKNOWN;
434
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case 'G': /* --global-env */
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add_environment(getplugin(NULL), arg, true);
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
437
426
case 'o': /* --options-for */
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
448
argp_error(state, "Empty plugin name");
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
460
441
case 'E': /* --env-for */
462
446
char *envdef = strchr(arg, ':');
463
447
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
471
argp_error(state, "Empty plugin name");
451
if(not add_environment(getplugin(arg), envdef+1, true)){
452
perror("add_environment");
475
add_environment(getplugin(arg), envdef, true);
478
456
case 'd': /* --disable */
480
458
plugin *p = getplugin(arg);
460
return ARGP_ERR_UNKNOWN;
486
465
case 'e': /* --enable */
488
467
plugin *p = getplugin(arg);
469
return ARGP_ERR_UNKNOWN;
494
474
case 128: /* --plugin-dir */
496
476
plugindir = strdup(arg);
477
if(plugindir == NULL){
498
481
case 129: /* --config-file */
499
482
/* This is already done by parse_opt_config_file() */
501
484
case 130: /* --userid */
502
486
tmpmax = strtoimax(arg, &tmp, 10);
503
487
if(errno != 0 or tmp == arg or *tmp != '\0'
504
488
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
511
495
case 131: /* --groupid */
512
497
tmpmax = strtoimax(arg, &tmp, 10);
513
498
if(errno != 0 or tmp == arg or *tmp != '\0'
514
499
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
521
506
case 132: /* --debug */
525
* These reproduce what we would get without ARGP_NO_HELP
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
539
510
* When adding more options before this line, remember to also add a
540
511
* "case" to the "parse_opt_config_file" function below.
683
647
/* Check for harmful errors and go to fallback. Other errors might
684
648
not affect opening plugins */
685
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
651
exitstatus = EXIT_FAILURE;
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
693
657
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
707
exitstatus = EX_CONFIG;
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
if(ret == ARGP_ERR_UNKNOWN){
661
fprintf(stderr, "Unknown error while parsing arguments\n");
662
exitstatus = EXIT_FAILURE;
712
667
/* Parse actual command line arguments, to let them override the
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
727
exitstatus = EX_USAGE;
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
754
error(0, errno, "fstat");
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
759
error(0, errno, "fchown");
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
767
/* Lower permissions */
690
/* Strip permissions down to nobody */
770
error(0, errno, "setgid");
772
695
ret = setuid(uid);
774
error(0, errno, "setuid");
777
/* Open plugin directory with close_on_exec flag */
700
if(plugindir == NULL){
703
dir = opendir(plugindir);
707
perror("Could not open plugin dir");
708
exitstatus = EXIT_FAILURE;
712
/* Set the FD_CLOEXEC flag on the directory, if possible */
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
784
#else /* not O_CLOEXEC */
786
#endif /* not O_CLOEXEC */
789
dir_fd = open(plugindir, O_RDONLY |
792
#else /* not O_CLOEXEC */
794
#endif /* not O_CLOEXEC */
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
812
#endif /* O_CLOEXEC */
814
dir = fdopendir(dir_fd);
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
714
int dir_fd = dirfd(dir);
716
ret = set_cloexec_flag(dir_fd);
718
perror("set_cloexec_flag");
719
exitstatus = EXIT_FAILURE;
953
854
if(p->environ[0] != NULL){
954
855
for(char **e = environ; *e != NULL; e++){
955
856
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
857
perror("add_environment");
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
866
exitstatus = EXIT_FAILURE;
968
869
/* Ask OS to automatic close the pipe on exec */
969
870
ret = set_cloexec_flag(pipefd[0]);
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
872
perror("set_cloexec_flag");
873
exitstatus = EXIT_FAILURE;
975
876
ret = set_cloexec_flag(pipefd[1]);
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
878
perror("set_cloexec_flag");
879
exitstatus = EXIT_FAILURE;
981
882
/* Block SIGCHLD until process is safely in process list */
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
887
perror("sigprocmask");
888
exitstatus = EXIT_FAILURE;
990
891
/* Starting a new process to be watched */
994
} while(pid == -1 and errno == EINTR);
895
}while(pid == -1 and errno == EINTR);
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
898
exitstatus = EXIT_FAILURE;
1001
902
/* this is the child process */
1002
903
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1004
error(0, errno, "sigaction");
1007
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1009
error(0, errno, "sigprocmask");
910
perror("sigprocmask");
1013
914
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1015
error(0, errno, "dup2");
1019
920
if(dirfd(dir) < 0){