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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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asprintf(), O_CLOEXEC */
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#include <stddef.h> /* size_t, NULL */
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#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
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EXIT_SUCCESS, realloc() */
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#include <stdbool.h> /* bool, true, false */
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#include <stdio.h> /* perror, fileno(), fprintf(),
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stderr, STDOUT_FILENO */
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#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
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#include <sys/types.h> /* DIR, opendir(), 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, fdopendir(),
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#include <dirent.h> /* DIR, struct dirent, opendir(),
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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(),
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.doc = "Group ID the plugins will run as", .group = 3 },
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{ .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
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{ .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 },
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error_t parse_opt(int key, char *arg, struct argp_state *state){
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error_t parse_opt(int key, char *arg, __attribute__((unused))
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struct argp_state *state){
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case 'g': /* --global-options */
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char *plugin_option;
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(plugin_option[0] == '\0'){
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if(not add_argument(getplugin(NULL), plugin_option)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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case 'G': /* --global-env */
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add_environment(getplugin(NULL), arg, true);
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if(not add_environment(getplugin(NULL), arg, true)){
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perror("add_environment");
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case 'o': /* --options-for */
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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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char *plugin_name = strsep(&arg, ":");
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if(plugin_name[0] == '\0'){
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(plugin_name), plugin_option)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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case 'E': /* --env-for */
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char *envdef = strchr(arg, ':');
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if(envdef == 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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if(not add_environment(getplugin(arg), envdef+1, true)){
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perror("add_environment");
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add_environment(getplugin(arg), envdef, true);
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case 'd': /* --disable */
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plugin *p = getplugin(arg);
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return ARGP_ERR_UNKNOWN;
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case 'e': /* --enable */
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plugin *p = getplugin(arg);
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return ARGP_ERR_UNKNOWN;
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case 128: /* --plugin-dir */
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plugindir = strdup(arg);
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if(plugindir == NULL){
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case 129: /* --config-file */
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/* This is already done by parse_opt_config_file() */
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case 130: /* --userid */
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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 != (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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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'){
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fprintf(stderr, "Bad user ID number: \"%s\", using %"
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PRIdMAX "\n", arg, (intmax_t)uid);
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case 131: /* --groupid */
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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 %"
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PRIdMAX, arg, (intmax_t)gid);
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ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
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if(ret < 1 or tmpmax != (gid_t)tmpmax
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or arg[numchars] != '\0'){
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fprintf(stderr, "Bad group ID number: \"%s\", using %"
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PRIdMAX "\n", 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
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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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* 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.
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/* If there were any arguments from the configuration file, pass
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them to parser as command line arguments */
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/* If there was any arguments from configuration file,
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pass them to parser as command arguments */
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if(custom_argv != NULL){
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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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perror("argp_parse");
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exitstatus = EX_OSERR;
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exitstatus = EX_CONFIG;
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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;
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/* Parse actual command line arguments, to let them override the
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ret = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
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perror("argp_parse");
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exitstatus = EX_OSERR;
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exitstatus = EX_USAGE;
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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");
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exitstatus = EXIT_FAILURE;
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perror("setuid");
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/* Open plugin directory with close_on_exec flag */
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if(plugindir == NULL){
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dir = opendir(plugindir);
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perror("Could not open plugin dir");
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exitstatus = EXIT_FAILURE;
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/* Set the FD_CLOEXEC flag on the directory, if possible */
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if(plugindir == NULL){
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dir_fd = open(PDIR, O_RDONLY |
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#else /* not O_CLOEXEC */
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#endif /* not O_CLOEXEC */
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dir_fd = open(plugindir, O_RDONLY |
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#else /* not O_CLOEXEC */
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#endif /* not O_CLOEXEC */
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perror("Could not open plugin dir");
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exitstatus = EXIT_FAILURE;
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/* Set the FD_CLOEXEC flag on the directory */
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ret = set_cloexec_flag(dir_fd);
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perror("set_cloexec_flag");
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TEMP_FAILURE_RETRY(close(dir_fd));
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exitstatus = EXIT_FAILURE;
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#endif /* O_CLOEXEC */
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dir = fdopendir(dir_fd);
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perror("Could not open plugin dir");
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TEMP_FAILURE_RETRY(close(dir_fd));
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exitstatus = EXIT_FAILURE;
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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;
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if(plugindir == NULL){
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ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
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ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
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ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
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ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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perror("asprintf");
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ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
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ret = stat(filename, &st);
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/* Ignore non-executable files */
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if(not S_ISREG(st.st_mode)
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or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
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if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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fprintf(stderr, "Ignoring plugin dir entry \"%s\""
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" with bad type or mode\n", filename);