25
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#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_FAILURE,
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EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
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#include <stdbool.h> /* bool, true, false */
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#include <stdio.h> /* perror, fileno(), fprintf(),
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#include <stdio.h> /* fileno(), fprintf(),
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stderr, STDOUT_FILENO */
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#include <sys/types.h> /* DIR, opendir(), stat(), struct
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#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
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stat, waitpid(), WIFEXITED(),
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WEXITSTATUS(), wait(), pid_t,
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uid_t, gid_t, getuid(), getgid(),
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#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
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FD_SET(), FD_ISSET(), FD_CLR */
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#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG(),
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#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
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#include <iso646.h> /* and, or, not */
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#include <dirent.h> /* DIR, struct dirent, opendir(),
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#include <dirent.h> /* DIR, struct dirent, fdopendir(),
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readdir(), closedir(), dirfd() */
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#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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fcntl(), setuid(), setgid(),
374
404
.doc = "Group ID the plugins will run as", .group = 3 },
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405
{ .name = "debug", .key = 132,
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.doc = "Debug mode", .group = 4 },
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* These reproduce what we would get without ARGP_NO_HELP
410
{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
383
424
case 'g': /* --global-options */
386
while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), plugin_option)){
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434
case 'G': /* --global-env */
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if(not add_environment(getplugin(NULL), arg, true)){
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perror("add_environment");
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add_environment(getplugin(NULL), arg, true);
405
437
case 'o': /* --options-for */
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char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
416
while((p = strsep(&opt, ",")) != NULL){
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if(not add_argument(getplugin(p_name), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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char *option_list = strchr(arg, ':');
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if(option_list == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
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argp_error(state, "Empty plugin name");
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while((option = strsep(&option_list, ",")) != NULL){
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if(not add_argument(getplugin(arg), option)){
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460
case 'E': /* --env-for */
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char *envdef = strchr(arg, ':');
433
463
if(envdef == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
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if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
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argp_error(state, "Empty plugin name");
475
add_environment(getplugin(arg), envdef, true);
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478
case 'd': /* --disable */
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480
plugin *p = getplugin(arg);
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return ARGP_ERR_UNKNOWN;
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486
case 'e': /* --enable */
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488
plugin *p = getplugin(arg);
455
return ARGP_ERR_UNKNOWN;
460
494
case 128: /* --plugin-dir */
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496
plugindir = strdup(arg);
463
if(plugindir == NULL){
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498
case 129: /* --config-file */
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499
/* This is already done by parse_opt_config_file() */
470
501
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
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if(ret < 1 or tmpmax != (uid_t)tmpmax
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or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
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PRIdMAX "\n", arg, (intmax_t)uid);
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tmpmax = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
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argp_error(state, "Bad user ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)uid);
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511
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
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tmpmax = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmpmax != (gid_t)tmpmax){
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argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
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case 132: /* --debug */
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* These reproduce what we would get without ARGP_NO_HELP
527
case '?': /* --help */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
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argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
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case -3: /* --usage */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
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case 'V': /* --version */
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fprintf(state->out_stream, "%s\n", argp_program_version);
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539
* When adding more options before this line, remember to also add a
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* "case" to the "parse_opt_config_file" function below.
609
661
custom_argv = realloc(custom_argv, sizeof(char *)
610
662
* ((unsigned int) custom_argc + 1));
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663
if(custom_argv == NULL){
613
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
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669
custom_argv[custom_argc-1] = new_arg;
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custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
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ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
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error(0, errno, "fclose");
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exitstatus = EX_IOERR;
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/* Check for harmful errors and go to fallback. Other errors might
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not affect opening plugins */
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if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
627
exitstatus = EXIT_FAILURE;
686
error(0, errno, "fopen");
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exitstatus = EX_OSERR;
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
633
693
if(custom_argv != NULL){
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ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
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if(ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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exitstatus = EXIT_FAILURE;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
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ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
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error(0, errno, "argp_parse");
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exitstatus = EX_OSERR;
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exitstatus = EX_CONFIG;
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/* Parse actual command line arguments, to let them override the
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ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
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if(ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
714
ret = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
727
exitstatus = EX_USAGE;
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745
/* Strip permissions down to nobody */
748
error(0, errno, "setgid");
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ret = setuid(uid);
676
if(plugindir == NULL){
679
dir = opendir(plugindir);
683
perror("Could not open plugin dir");
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exitstatus = EXIT_FAILURE;
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
752
error(0, errno, "setuid");
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/* Open plugin directory with close_on_exec flag */
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int dir_fd = dirfd(dir);
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ret = set_cloexec_flag(dir_fd);
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perror("set_cloexec_flag");
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exitstatus = EXIT_FAILURE;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
762
#else /* not O_CLOEXEC */
764
#endif /* not O_CLOEXEC */
767
dir_fd = open(plugindir, O_RDONLY |
770
#else /* not O_CLOEXEC */
772
#endif /* not O_CLOEXEC */
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error(0, errno, "Could not open plugin dir");
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exitstatus = EX_UNAVAILABLE;
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/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
790
#endif /* O_CLOEXEC */
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dir = fdopendir(dir_fd);
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error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
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exitstatus = EX_OSERR;
764
866
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
875
error(0, errno, "asprintf");
774
ret = stat(filename, &st);
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
881
error(0, errno, "stat");
781
886
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
784
890
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
891
" with bad type or mode\n", filename);
825
931
if(p->environ[0] != NULL){
826
932
for(char **e = environ; *e != NULL; e++){
827
933
if(not add_environment(p, *e, false)){
828
perror("add_environment");
934
error(0, errno, "add_environment");
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
837
exitstatus = EXIT_FAILURE;
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
840
946
/* Ask OS to automatic close the pipe on exec */
841
947
ret = set_cloexec_flag(pipefd[0]);
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
847
953
ret = set_cloexec_flag(pipefd[1]);
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
853
959
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
860
968
/* Starting a new process to be watched */
972
} while(pid == -1 and errno == EINTR);
864
exitstatus = EXIT_FAILURE;
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
868
979
/* this is the child process */
869
980
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
982
error(0, errno, "sigaction");
874
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
876
perror("sigprocmask");
987
error(0, errno, "sigprocmask");
880
991
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
993
error(0, errno, "dup2");
886
997
if(dirfd(dir) < 0){
891
1002
if(p->environ[0] == NULL){
892
1003
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
897
1008
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
904
1015
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
907
1019
plugin *new_plugin = getplugin(dirst->d_name);
908
1020
if(new_plugin == NULL){
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
912
perror("sigprocmask");
1026
error(0, errno, "sigprocmask");
914
exitstatus = EXIT_FAILURE;
1028
exitstatus = EX_OSERR;
966
1084
if(not WIFEXITED(proc->status)
967
1085
or WEXITSTATUS(proc->status) != 0){
968
1086
/* Bad exit by plugin */
971
1089
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
974
1093
WEXITSTATUS(proc->status));
975
1094
} else if(WIFSIGNALED(proc->status)){
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
979
1100
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
985
1106
/* Remove the plugin */
986
FD_CLR(proc->fd, &rfds_all);
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
988
1110
/* Block signal while modifying process_list */
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1113
&sigchld_action.sa_mask,
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;