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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
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* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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* <https://www.fukt.bsnet.se/~teddy/>.
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#include <stdio.h> /* popen(), fileno(), fprintf(),
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stderr, STDOUT_FILENO */
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#include <iso646.h> /* and, or, not */
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#include <sys/types.h> /* DIR, opendir(), stat(), struct stat,
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waitpid(), WIFEXITED(),
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WEXITSTATUS(), wait() */
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#include <sys/wait.h> /* wait() */
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#include <dirent.h> /* DIR, struct dirent, opendir(),
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readdir(), closedir() */
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#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
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#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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#include <fcntl.h> /* fcntl() */
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#include <stddef.h> /* NULL */
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#include <stdlib.h> /* EXIT_FAILURE */
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#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
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FD_SET(), FD_ISSET() */
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#include <string.h> /* strlen(), strcpy(), strcat() */
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#include <stdbool.h> /* true */
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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#include <errno.h> /* errno */
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#include <argp.h> /* struct argp_option,
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struct argp_state, struct argp,
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#define _FORTIFY_SOURCE 2
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#include <stdio.h> /* popen, fileno */
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#include <iso646.h> /* and, or, not */
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#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
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WIFEXITED, WEXITSTATUS, wait */
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#include <sys/wait.h> /* wait */
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#include <dirent.h> /* DIR, opendir */
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#include <sys/stat.h> /* stat, struct stat */
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#include <unistd.h> /* stat, struct stat, chdir */
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#include <stdlib.h> /* EXIT_FAILURE */
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#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
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#include <string.h> /* strlen, strcpy, strcat */
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#include <stdbool.h> /* true */
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#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
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#include <errno.h> /* errno */
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struct process *next;
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typedef struct plugin{
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char *name; /* can be NULL or any plugin name */
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plugin *getplugin(char *name, plugin **plugin_list){
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for (plugin *p = *plugin_list; p != NULL; p = p->next){
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or (p->name and name and (strcmp(p->name, name) == 0))){
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/* Create a new plugin */
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plugin *new_plugin = malloc(sizeof(plugin));
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if (new_plugin == NULL){
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new_plugin->name = name;
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new_plugin->argv = malloc(sizeof(char *) * 2);
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if (new_plugin->argv == NULL){
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new_plugin->argv[0] = name;
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new_plugin->argv[1] = NULL;
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new_plugin->disabled = false;
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new_plugin->next = *plugin_list;
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/* Append the new plugin to the list */
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*plugin_list = new_plugin;
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void addargument(plugin *p, char *arg){
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p->argv[p->argc] = arg;
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p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
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if (p->argv == NULL){
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p->argv[p->argc] = NULL;
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* Based on the example in the GNU LibC manual chapter 13.13 "File
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* *Note File Descriptor Flags:(libc)Descriptor Flags.
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int set_cloexec_flag(int fd)
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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 fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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#define BUFFER_SIZE 256
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const char *argp_program_version =
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"plugbasedclient 0.9";
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const char *argp_program_bug_address =
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"<mandos@fukt.bsnet.se>";
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int main(int argc, char *argv[]){
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const char *plugindir = "/conf/conf.d/mandos/plugins.d";
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char plugindir[] = "plugins.d";
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size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
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struct dirent *dirst;
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int ret, maxfd = 0;
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process *process_list = NULL;
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int exitstatus = EXIT_SUCCESS;
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/* The options we understand. */
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struct argp_option options[] = {
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{ .name = "global-options", .key = 'g',
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.arg = "OPTION[,OPTION[,...]]",
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.doc = "Options passed to all plugins" },
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{ .name = "options-for", .key = 'o',
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.arg = "PLUGIN:OPTION[,OPTION[,...]]",
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.doc = "Options passed only to specified plugin" },
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{ .name = "disable", .key = 'd',
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.doc = "Disable a specific plugin", .group = 1 },
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{ .name = "plugin-dir", .key = 128,
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.doc = "Specify a different plugin directory", .group = 2 },
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{ .name = "debug", .key = 129,
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.doc = "Debug mode", .group = 3 },
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error_t parse_opt (int key, char *arg, struct argp_state *state) {
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/* Get the INPUT argument from `argp_parse', which we
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know is a pointer to our plugin list pointer. */
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plugin **plugins = state->input;
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char *p = strtok(arg, ",");
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addargument(getplugin(NULL, plugins), p);
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p = strtok(NULL, ",");
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char *name = strtok(arg, ":");
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char *p = strtok(NULL, ":");
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addargument(getplugin(name, plugins), p);
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p = strtok(NULL, ",");
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getplugin(arg, plugins)->disabled = true;
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return ARGP_ERR_UNKNOWN;
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plugin *plugin_list = NULL;
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struct argp argp = { .options = options, .parser = parse_opt,
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.doc = "Mandos plugin runner -- Run plugins" };
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argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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for(plugin *p = plugin_list; p != NULL; p=p->next){
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fprintf(stderr, "Plugin: %s has %d arguments\n",
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p->name ? p->name : "Global", p->argc - 1);
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for(char **a = p->argv; *a != NULL; a++){
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fprintf(stderr, "\tArg: %s\n", *a);
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dir = opendir(plugindir);
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/* Set the FD_CLOEXEC flag on the directory */
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ret = set_cloexec_flag(dirfd(dir));
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perror("set_cloexec_flag");
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fprintf(stderr, "Can not open directory\n");
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return EXIT_FAILURE;
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dirst = readdir(dir);
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d_name_len = strlen(dirst->d_name);
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// Ignore dotfiles, backup files and other junk
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bool bad_name = false;
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const char const *bad_prefixes[] = { ".", "#", NULL };
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const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
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".dpkg-divert", NULL };
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for(const char **pre = bad_prefixes; *pre != NULL; pre++){
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size_t pre_len = strlen(*pre);
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if((d_name_len >= pre_len)
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and strncmp((dirst->d_name), *pre, pre_len) == 0){
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fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
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" with bad prefix %s\n", dirst->d_name, *pre);
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for(const char **suf = bad_suffixes; *suf != NULL; suf++){
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size_t suf_len = strlen(*suf);
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if((d_name_len >= suf_len)
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and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
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fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
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" with bad suffix %s\n", dirst->d_name, *suf);
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char *filename = malloc(d_name_len + strlen(plugindir) + 2);
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if (filename == NULL){
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exitstatus =EXIT_FAILURE;
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// Ignore dotfiles and backup files
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if (dirst->d_name[0] == '.'
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or dirst->d_name[d_name_len - 1] == '~'){
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char *filename = malloc(d_name_len + plugindir_len + 2);
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strcpy(filename, plugindir);
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strcat(filename, "/");
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strcat(filename, dirst->d_name);
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stat(filename, &st);
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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 name \"%s\""
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" with bad type or mode\n", filename);
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if(getplugin(dirst->d_name, &plugin_list)->disabled){
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fprintf(stderr, "Ignoring disabled plugin \"%s\"",
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// Starting a new process to be watched
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plugin *p = getplugin(dirst->d_name, &plugin_list);
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/* Add global arguments to argument list for this plugin */
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plugin *g = getplugin(NULL, &plugin_list);
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for(char **a = g->argv + 1; *a != NULL; a++){
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/* this is the child process */
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close(pipefd[0]); /* close unused read end of pipe */
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dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
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if(execv(filename, p->argv) < 0){
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if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
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// Starting a new process to be watched
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process *new_process = malloc(sizeof(process));
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new_process->pid = fork();
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if(new_process->pid == 0){
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/* this is the child process */
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close(pipefd[0]); /* close unused read end of pipe */
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dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
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/* create a new modified argument list */
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char **new_argv = malloc(sizeof(char *)
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* ((unsigned int) argc + 1));
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new_argv[0] = filename;
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for(int i = 1; i < argc; i++){
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new_argv[i] = argv[i];
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new_argv[argc] = NULL;
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if(execv(filename, new_argv) < 0){
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close(pipefd[1]); /* close unused write end of pipe */
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new_process->fd = pipefd[0];
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new_process->buffer = malloc(BUFFER_SIZE);
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if (new_process->buffer == NULL){
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close(pipefd[1]); /* close unused write end of pipe */
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process *new_process = malloc(sizeof(process));
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if (new_process == NULL){
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exitstatus = EXIT_FAILURE;
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new_process->fd = pipefd[0];
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new_process->buffer = malloc(BUFFER_SIZE);
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if (new_process->buffer == NULL){
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exitstatus = EXIT_FAILURE;
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new_process->buffer_size = BUFFER_SIZE;
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new_process->buffer_length = 0;
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FD_SET(new_process->fd, &rfds_all);
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if (maxfd < new_process->fd){
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maxfd = new_process->fd;
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new_process->next = process_list;
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process_list = new_process;
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new_process->buffer_size = BUFFER_SIZE;
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new_process->buffer_length = 0;
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FD_SET(new_process->fd, &rfds_orig);
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if (maxfd < new_process->fd){
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maxfd = new_process->fd;
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new_process->next = process_list;
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process_list = new_process;
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if (process_list != NULL){
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fd_set rfds = rfds_all;
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fd_set rfds = rfds_orig;
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int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
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if (select_ret == -1){