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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 <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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#include <string.h> /* strsep, strlen(), asprintf(),
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#include <string.h> /* strsep, strlen(), asprintf() */
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#include <errno.h> /* errno */
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#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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#include <signal.h> /* struct sigaction, sigemptyset(),
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sigaddset(), sigaction(),
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sigprocmask(), SIG_BLOCK, SIGCHLD,
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SIG_UNBLOCK, kill(), sig_atomic_t
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SIG_UNBLOCK, kill() */
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#include <errno.h> /* errno, EBADF */
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#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
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#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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#define BUFFER_SIZE 256
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/* Create a new plugin */
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plugin *new_plugin = NULL;
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new_plugin = malloc(sizeof(plugin));
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} while(new_plugin == NULL and errno == EINTR);
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plugin *new_plugin = malloc(sizeof(plugin));
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if(new_plugin == NULL){
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char *copy_name = NULL;
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if(name != NULL){
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copy_name = strdup(name);
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} while(copy_name == NULL and errno == EINTR);
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copy_name = strdup(name);
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if(copy_name == NULL){
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*new_plugin = (plugin){ .name = copy_name,
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.next = plugin_list };
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*new_plugin = (plugin) { .name = copy_name,
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.next = plugin_list };
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new_plugin->argv = malloc(sizeof(char *) * 2);
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} while(new_plugin->argv == NULL and errno == EINTR);
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new_plugin->argv = malloc(sizeof(char *) * 2);
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if(new_plugin->argv == NULL){
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free(new_plugin);
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new_plugin->argv[0] = copy_name;
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new_plugin->argv[1] = NULL;
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new_plugin->environ = malloc(sizeof(char *));
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} while(new_plugin->environ == NULL and errno == EINTR);
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new_plugin->environ = malloc(sizeof(char *));
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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static bool add_to_char_array(const char *new, char ***array,
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/* Resize the pointed-to array to hold one more pointer */
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*array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
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} while(*array == NULL and errno == EINTR);
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*array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
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/* Malloc check */
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if(*array == NULL){
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/* Make a copy of the new string */
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} while(copy == NULL and errno == EINTR);
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char *copy = strdup(new);
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if(copy == NULL){
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if(strncmp(*e, def, namelen + 1) == 0){
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/* It already exists */
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new = realloc(*e, strlen(def) + 1);
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} while(new == NULL and errno == EINTR);
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char *new = realloc(*e, strlen(def) + 1);
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* Based on the example in the GNU LibC manual chapter 13.13 "File
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* Descriptor Flags".
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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
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* *Note File Descriptor Flags:(libc)Descriptor Flags.
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static int set_cloexec_flag(int fd){
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int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
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int ret = fcntl(fd, F_GETFD, 0);
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/* If reading the flags failed, return error indication now. */
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/* Store modified flag word in the descriptor. */
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return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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/* Mark processes as completed when they exit, and save their exit
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static void handle_sigchld(__attribute__((unused)) int sig){
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int old_errno = errno;
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plugin *proc = plugin_list;
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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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struct argp_state *state) {
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case 'g': /* --global-options */
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(plugin_option[0] == '\0'){
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while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), plugin_option)){
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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;
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case 'o': /* --options-for */
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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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char *p_name = strsep(&arg, ":");
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if(p_name[0] == '\0' or arg == NULL){
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char *opt = strsep(&arg, ":");
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if(opt[0] == '\0' or opt == NULL){
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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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plugindir = strdup(arg);
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if(plugindir == NULL){
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perror("strdup");
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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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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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477
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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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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ignores everything but the --config-file option. */
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error_t parse_opt_config_file(int key, char *arg,
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__attribute__((unused))
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struct argp_state *state){
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struct argp_state *state) {
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case 'g': /* --global-options */
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case 'G': /* --global-env */
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case 'o': /* --options-for */
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conffp = fopen(AFILE, "r");
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conffp = fopen(argfile, "r");
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if(conffp != NULL){
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char *org_line = NULL;
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char *p, *arg, *new_arg, *line;
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const char whitespace_delims[] = " \r\t\f\v\n";
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const char comment_delim[] = "#";
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custom_argv = malloc(sizeof(char*) * 2);
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if(custom_argv == NULL){
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custom_argv[custom_argc-1] = new_arg;
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custom_argv[custom_argc] = NULL;
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custom_argv[custom_argc] = NULL;
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ret = fclose(conffp);
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} while(ret == EOF and errno == EINTR);
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exitstatus = EXIT_FAILURE;
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/* Check for harmful errors and go to fallback. Other errors might
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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);
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/* Block SIGCHLD until process is safely in process list */
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ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
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&sigchld_action.sa_mask,
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ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
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perror("sigprocmask");
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exitstatus = EXIT_FAILURE;
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/* Starting a new process to be watched */
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} while(pid == -1 and errno == EINTR);
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exitstatus = EXIT_FAILURE;
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/* Parent process */
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TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
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close(pipefd[1]); /* Close unused write end of pipe */
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plugin *new_plugin = getplugin(dirst->d_name);
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if(new_plugin == NULL){
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perror("getplugin");
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ret = (int)(TEMP_FAILURE_RETRY
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(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
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ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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perror("sigprocmask");
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/* Unblock SIGCHLD so signal handler can be run if this process
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has already completed */
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ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
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&sigchld_action.sa_mask,
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ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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perror("sigprocmask");
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exitstatus = EXIT_FAILURE;
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FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
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FD_SET(new_plugin->fd, &rfds_all);
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if(maxfd < new_plugin->fd){
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maxfd = new_plugin->fd;
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TEMP_FAILURE_RETRY(closedir(dir));
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free_plugin(getplugin(NULL));
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for(plugin *p = plugin_list; p != NULL; p = p->next){
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while(plugin_list){
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fd_set rfds = rfds_all;
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int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
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if(select_ret == -1 and errno != EINTR){
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if(select_ret == -1){
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perror("select");
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exitstatus = EXIT_FAILURE;
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from one of them */
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for(plugin *proc = plugin_list; proc != NULL;){
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/* Is this process completely done? */
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if(proc->completed and proc->eof){
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if(proc->eof and proc->completed){
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/* Only accept the plugin output if it exited cleanly */
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if(not WIFEXITED(proc->status)
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or WEXITSTATUS(proc->status) != 0){
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/* Bad exit by plugin */
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if(WIFEXITED(proc->status)){
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fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1016
" status %d\n", proc->name,
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(intmax_t) (proc->pid),
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fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
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" %d\n", (intmax_t) (proc->pid),
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WEXITSTATUS(proc->status));
1019
} else if(WIFSIGNALED(proc->status)){
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fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
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" signal %d: %s\n", proc->name,
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(intmax_t) (proc->pid),
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WTERMSIG(proc->status),
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strsignal(WTERMSIG(proc->status)));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
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" %d\n", (intmax_t) (proc->pid),
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WTERMSIG(proc->status));
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} else if(WCOREDUMP(proc->status)){
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fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
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" core\n", proc->name, (intmax_t) (proc->pid));
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fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
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(intmax_t) (proc->pid));
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/* Remove the plugin */
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FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
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FD_CLR(proc->fd, &rfds_all);
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/* Block signal while modifying process_list */
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ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1038
&sigchld_action.sa_mask,
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
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perror("sigprocmask");
1042
989
exitstatus = EXIT_FAILURE;
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995
proc = next_plugin;
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/* We are done modifying process list, so unblock signal */
1051
ret = (int)(TEMP_FAILURE_RETRY
1052
(sigprocmask(SIG_UNBLOCK,
1053
&sigchld_action.sa_mask, NULL)));
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1055
1001
perror("sigprocmask");
1056
1002
exitstatus = EXIT_FAILURE;
1078
1024
/* This process has not completed. Does it have any output? */
1079
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
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1026
/* This process had nothing to say at this time */
1083
1027
proc = proc->next;
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1039
proc->buffer_size += BUFFER_SIZE;
1097
1041
/* Read from the process */
1098
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1100
+ proc->buffer_length,
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1103
1045
/* Read error from this process; ignore the error */
1104
1046
proc = proc->next;