/mandos/trunk : revision 376

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/* -*- coding: utf-8 -*- */

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/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */

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/*

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* Mandos plugin runner - Run Mandos plugins

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*

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*

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* This program is free software: you can redistribute it and/or

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* modify it under the terms of the GNU General Public License as

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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, popen(), fileno(),

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fprintf(), stderr, STDOUT_FILENO */

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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, opendir(), stat(), struct

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stat, waitpid(), WIFEXITED(),

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WEXITSTATUS(), wait(), pid_t,

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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() */

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WEXITSTATUS(), WTERMSIG(),

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WCOREDUMP() */

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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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fcntl(), setuid(), setgid(),

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F_GETFD, F_SETFD, FD_CLOEXEC,

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access(), pipe(), fork(), close()

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dup2, STDOUT_FILENO, _exit(),

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dup2(), STDOUT_FILENO, _exit(),

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execv(), write(), read(),

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close() */

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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,

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FD_CLOEXEC */

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#include <string.h> /* strsep, strlen(), asprintf() */

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#include <string.h> /* strsep, strlen(), asprintf(),

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strsignal() */

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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() */

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SIG_UNBLOCK, kill(), sig_atomic_t

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*/

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#include <errno.h> /* errno, EBADF */

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#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */

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#define BUFFER_SIZE 256

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#define PDIR "/lib/mandos/plugins.d"

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#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"

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const char *argp_program_version = "plugin-runner 1.0";

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const char *argp_program_version = "plugin-runner " VERSION;

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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

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struct plugin;

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typedef struct plugin{

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char *name; /* can be NULL or any plugin name */

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char **argv;

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char **environ;

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int envc;

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bool disabled;

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/* Variables used for running processes*/

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pid_t pid;

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int fd;

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size_t buffer_size;

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size_t buffer_length;

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bool eof;

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volatile bool completed;

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volatile int status;

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volatile sig_atomic_t completed;

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int status;

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struct plugin *next;

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} plugin;

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or if none is found, creates a new one */

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static plugin *getplugin(char *name){

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/* Check for exiting plugin with that name */

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for (plugin *p = plugin_list; p != NULL; p = p->next){

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if ((p->name == name)

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or (p->name and name and (strcmp(p->name, name) == 0))){

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for(plugin *p = plugin_list; p != NULL; p = p->next){

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if((p->name == name)

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or (p->name and name and (strcmp(p->name, name) == 0))){

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return p;

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}

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}

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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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plugin *new_plugin = NULL;

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do {

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new_plugin = malloc(sizeof(plugin));

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} while(new_plugin == NULL and errno == EINTR);

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if(new_plugin == NULL){

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return NULL;

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}

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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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do {

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copy_name = strdup(name);

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} while(copy_name == NULL and errno == EINTR);

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if(copy_name == NULL){

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free(new_plugin);

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return NULL;

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}

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}

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*new_plugin = (plugin) { .name = copy_name,

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.argc = 1,

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.disabled = false,

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.next = plugin_list };

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*new_plugin = (plugin){ .name = copy_name,

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.argc = 1,

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.disabled = false,

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.next = plugin_list };

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new_plugin->argv = malloc(sizeof(char *) * 2);

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if (new_plugin->argv == NULL){

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do {

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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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if(new_plugin->argv == NULL){

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free(copy_name);

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free(new_plugin);

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return NULL;

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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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do {

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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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if(new_plugin->environ == NULL){

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free(copy_name);

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free(new_plugin->argv);

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164

static bool add_to_char_array(const char *new, char ***array,

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int *len){

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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));

167

do {

168

*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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/* Malloc check */

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if(*array == NULL){

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return false;

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}

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/* Make a copy of the new string */

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char *copy = strdup(new);

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char *copy;

177

do {

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copy = strdup(new);

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} while(copy == NULL and errno == EINTR);

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if(copy == NULL){

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return false;

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}

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if(strncmp(*e, def, namelen + 1) == 0){

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/* It already exists */

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if(replace){

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char *new = realloc(*e, strlen(def) + 1);

211

char *new;

212

do {

213

new = realloc(*e, strlen(def) + 1);

214

} while(new == NULL and errno == EINTR);

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if(new == NULL){

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return false;

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}

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/*

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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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* *Note File Descriptor Flags:(libc)Descriptor Flags.

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| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |

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*/

211

static int set_cloexec_flag(int fd)

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{

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int ret = fcntl(fd, F_GETFD, 0);

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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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/* If reading the flags failed, return error indication now. */

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if(ret < 0){

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return ret;

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}

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/* Store modified flag word in the descriptor. */

219

return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);

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return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,

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ret | FD_CLOEXEC));

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}

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223

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/* Mark processes as completed when they exit, and save their exit

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status. */

225

void handle_sigchld(__attribute__((unused)) int sig){

246

static void handle_sigchld(__attribute__((unused)) int sig){

247

int old_errno = errno;

226

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while(true){

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plugin *proc = plugin_list;

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int status;

232

254

break;

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}

234

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if(pid == -1){

235

if (errno != ECHILD){

236

perror("waitpid");

257

if(errno == ECHILD){

258

/* No child processes */

259

break;

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260

}

238

/* No child processes */

239

break;

261

perror("waitpid");

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}

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/* A child exited, find it in process_list */

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continue;

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}

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proc->status = status;

251

proc->completed = true;

273

proc->completed = 1;

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}

275

errno = old_errno;

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}

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277

255

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/* Prints out a password to stdout */

256

bool print_out_password(const char *buffer, size_t length){

279

static bool print_out_password(const char *buffer, size_t length){

257

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ssize_t ret;

258

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for(size_t written = 0; written < length; written += (size_t)ret){

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ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,

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}

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free(plugin_node->environ);

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free(plugin_node->buffer);

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/* Removes the plugin from the singly-linked list */

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if(plugin_node == plugin_list){

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/* First one - simple */

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struct stat st;

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fd_set rfds_all;

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int ret, maxfd = 0;

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ssize_t sret;

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uid_t uid = 65534;

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gid_t gid = 65534;

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bool debug = false;

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{ .name = NULL }

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};

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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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switch (key) {

400

error_t parse_opt(int key, char *arg, __attribute__((unused))

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struct argp_state *state){

402

switch(key){

403

char *tmp;

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intmax_t tmpmax;

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405

case 'g': /* --global-options */

380

if (arg != NULL){

381

char *p;

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while((p = strsep(&arg, ",")) != NULL){

383

if(p[0] == '\0'){

406

if(arg != NULL){

407

char *plugin_option;

408

while((plugin_option = strsep(&arg, ",")) != NULL){

409

if(plugin_option[0] == '\0'){

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410

continue;

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411

}

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if(not add_argument(getplugin(NULL), p)){

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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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}

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if(arg == NULL){

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421

break;

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}

397

{

398

char *envdef = strdup(arg);

399

if(envdef == NULL){

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break;

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}

402

if(not add_environment(getplugin(NULL), envdef, true)){

403

perror("add_environment");

404

}

423

if(not add_environment(getplugin(NULL), arg, true)){

424

perror("add_environment");

405

425

}

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426

break;

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427

case 'o': /* --options-for */

408

if (arg != NULL){

409

char *p_name = strsep(&arg, ":");

410

if(p_name[0] == '\0' or arg == NULL){

411

break;

412

}

413

char *opt = strsep(&arg, ":");

414

if(opt[0] == '\0' or opt == NULL){

415

break;

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}

417

char *p;

418

while((p = strsep(&opt, ",")) != NULL){

419

if(p[0] == '\0'){

420

continue;

421

}

422

if(not add_argument(getplugin(p_name), p)){

428

if(arg != NULL){

429

char *plugin_name = strsep(&arg, ":");

430

if(plugin_name[0] == '\0'){

431

break;

432

}

433

char *plugin_option;

434

while((plugin_option = strsep(&arg, ",")) != NULL){

435

if(not add_argument(getplugin(plugin_name), plugin_option)){

423

436

perror("add_argument");

424

437

return ARGP_ERR_UNKNOWN;

425

438

}

435

448

if(envdef == NULL){

436

449

break;

437

450

}

438

char *p_name = strndup(arg, (size_t) (envdef-arg));

439

if(p_name == NULL){

440

break;

441

}

442

envdef++;

443

if(not add_environment(getplugin(p_name), envdef, true)){

451

*envdef = '\0';

452

if(not add_environment(getplugin(arg), envdef+1, true)){

444

453

perror("add_environment");

445

454

}

446

455

}

447

456

break;

448

457

case 'd': /* --disable */

449

if (arg != NULL){

458

if(arg != NULL){

450

459

plugin *p = getplugin(arg);

451

460

if(p == NULL){

452

461

return ARGP_ERR_UNKNOWN;

455

464

}

456

465

break;

457

466

case 'e': /* --enable */

458

if (arg != NULL){

467

if(arg != NULL){

459

468

plugin *p = getplugin(arg);

460

469

if(p == NULL){

461

470

return ARGP_ERR_UNKNOWN;

464

473

}

465

474

break;

466

475

case 128: /* --plugin-dir */

476

free(plugindir);

467

477

plugindir = strdup(arg);

468

478

if(plugindir == NULL){

469

479

perror("strdup");

470

}

480

}

471

481

break;

472

482

case 129: /* --config-file */

473

483

/* This is already done by parse_opt_config_file() */

474

484

break;

475

485

case 130: /* --userid */

476

uid = (uid_t)strtol(arg, NULL, 10);

486

errno = 0;

487

tmpmax = strtoimax(arg, &tmp, 10);

488

if(errno != 0 or tmp == arg or *tmp != '\0'

489

or tmpmax != (uid_t)tmpmax){

490

fprintf(stderr, "Bad user ID number: \"%s\", using %"

491

PRIdMAX "\n", arg, (intmax_t)uid);

492

} else {

493

uid = (uid_t)tmpmax;

494

}

477

495

break;

478

496

case 131: /* --groupid */

479

gid = (gid_t)strtol(arg, NULL, 10);

497

errno = 0;

498

tmpmax = strtoimax(arg, &tmp, 10);

499

if(errno != 0 or tmp == arg or *tmp != '\0'

500

or tmpmax != (gid_t)tmpmax){

501

fprintf(stderr, "Bad group ID number: \"%s\", using %"

502

PRIdMAX "\n", arg, (intmax_t)gid);

503

} else {

504

gid = (gid_t)tmpmax;

505

}

480

506

break;

481

507

case 132: /* --debug */

482

508

debug = true;

483

509

break;

510

/*

511

* When adding more options before this line, remember to also add a

512

* "case" to the "parse_opt_config_file" function below.

513

*/

484

514

case ARGP_KEY_ARG:

485

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

515

/* Cryptsetup always passes an argument, which is an empty

516

string if "none" was specified in /etc/crypttab. So if

517

argument was empty, we ignore it silently. */

518

if(arg[0] != '\0'){

519

fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);

520

}

486

521

break;

487

522

case ARGP_KEY_END:

488

523

break;

494

529

495

530

/* This option parser is the same as parse_opt() above, except it

496

531

ignores everything but the --config-file option. */

497

error_t parse_opt_config_file (int key, char *arg,

498

__attribute__((unused))

499

struct argp_state *state) {

500

switch (key) {

532

error_t parse_opt_config_file(int key, char *arg,

533

__attribute__((unused))

534

struct argp_state *state){

535

switch(key){

501

536

case 'g': /* --global-options */

502

537

case 'G': /* --global-env */

503

538

case 'o': /* --options-for */

507

542

case 128: /* --plugin-dir */

508

543

break;

509

544

case 129: /* --config-file */

545

free(argfile);

510

546

argfile = strdup(arg);

511

547

if(argfile == NULL){

512

548

perror("strdup");

513

549

}

514

break;

550

break;

515

551

case 130: /* --userid */

516

552

case 131: /* --groupid */

517

553

case 132: /* --debug */

529

565

.args_doc = "",

530

566

.doc = "Mandos plugin runner -- Run plugins" };

531

567

532

/* Parse using the parse_opt_config_file in order to get the custom

568

/* Parse using parse_opt_config_file() in order to get the custom

533

569

config file location, if any. */

534

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

535

if (ret == ARGP_ERR_UNKNOWN){

570

ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

571

if(ret == ARGP_ERR_UNKNOWN){

536

572

fprintf(stderr, "Unknown error while parsing arguments\n");

537

573

exitstatus = EXIT_FAILURE;

538

574

goto fallback;

542

578

argp.parser = parse_opt;

543

579

544

580

/* Open the configfile if available */

545

if (argfile == NULL){

581

if(argfile == NULL){

546

582

conffp = fopen(AFILE, "r");

547

583

} else {

548

584

conffp = fopen(argfile, "r");

549

}

585

}

550

586

if(conffp != NULL){

551

587

char *org_line = NULL;

552

588

char *p, *arg, *new_arg, *line;

553

589

size_t size = 0;

554

ssize_t sret;

555

590

const char whitespace_delims[] = " \r\t\f\v\n";

556

591

const char comment_delim[] = "#";

557

592

558

593

custom_argc = 1;

559

594

custom_argv = malloc(sizeof(char*) * 2);

560

595

if(custom_argv == NULL){

564

599

}

565

600

custom_argv[0] = argv[0];

566

601

custom_argv[1] = NULL;

567

602

568

603

/* for each line in the config file, strip whitespace and ignore

569

604

commented text */

570

605

while(true){

572

607

if(sret == -1){

573

608

break;

574

609

}

575

610

576

611

line = org_line;

577

612

arg = strsep(&line, comment_delim);

578

613

while((p = strsep(&arg, whitespace_delims)) != NULL){

597

632

goto fallback;

598

633

}

599

634

custom_argv[custom_argc-1] = new_arg;

600

custom_argv[custom_argc] = NULL;

635

custom_argv[custom_argc] = NULL;

601

636

}

602

637

}

638

do {

639

ret = fclose(conffp);

640

} while(ret == EOF and errno == EINTR);

641

if(ret == EOF){

642

perror("fclose");

643

exitstatus = EXIT_FAILURE;

644

goto fallback;

645

}

603

646

free(org_line);

604

647

} else {

605

648

/* Check for harmful errors and go to fallback. Other errors might

606

649

not affect opening plugins */

607

if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){

650

if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){

608

651

perror("fopen");

609

652

exitstatus = EXIT_FAILURE;

610

653

goto fallback;

613

656

/* If there was any arguments from configuration file,

614

657

pass them to parser as command arguments */

615

658

if(custom_argv != NULL){

616

ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,

617

0, NULL);

618

if (ret == ARGP_ERR_UNKNOWN){

659

ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,

660

0, NULL);

661

if(ret == ARGP_ERR_UNKNOWN){

619

662

fprintf(stderr, "Unknown error while parsing arguments\n");

620

663

exitstatus = EXIT_FAILURE;

621

664

goto fallback;

624

667

625

668

/* Parse actual command line arguments, to let them override the

626

669

config file */

627

ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

628

if (ret == ARGP_ERR_UNKNOWN){

670

ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);

671

if(ret == ARGP_ERR_UNKNOWN){

629

672

fprintf(stderr, "Unknown error while parsing arguments\n");

630

673

exitstatus = EXIT_FAILURE;

631

674

goto fallback;

638

681

for(char **a = p->argv; *a != NULL; a++){

639

682

fprintf(stderr, "\tArg: %s\n", *a);

640

683

}

641

fprintf(stderr, "...and %u environment variables\n", p->envc);

684

fprintf(stderr, "...and %d environment variables\n", p->envc);

642

685

for(char **a = p->environ; *a != NULL; a++){

643

686

fprintf(stderr, "\t%s\n", *a);

644

687

}

646

689

}

647

690

648

691

/* Strip permissions down to nobody */

692

setgid(gid);

693

if(ret == -1){

694

perror("setgid");

695

}

649

696

ret = setuid(uid);

650

if (ret == -1){

697

if(ret == -1){

651

698

perror("setuid");

652

}

653

setgid(gid);

654

if (ret == -1){

655

perror("setgid");

656

699

}

657

700

658

if (plugindir == NULL){

701

if(plugindir == NULL){

659

702

dir = opendir(PDIR);

660

703

} else {

661

704

dir = opendir(plugindir);

684

727

685

728

/* Read and execute any executable in the plugin directory*/

686

729

while(true){

687

dirst = readdir(dir);

730

do {

731

dirst = readdir(dir);

732

} while(dirst == NULL and errno == EINTR);

688

733

689

734

/* All directory entries have been processed */

690

735

if(dirst == NULL){

691

if (errno == EBADF){

736

if(errno == EBADF){

692

737

perror("readdir");

693

738

exitstatus = EXIT_FAILURE;

694

739

goto fallback;

706

751

707

752

const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",

708

753

".dpkg-old",

754

".dpkg-bak",

709

755

".dpkg-divert", NULL };

710

756

for(const char **pre = bad_prefixes; *pre != NULL; pre++){

711

757

size_t pre_len = strlen(*pre);

740

786

continue;

741

787

}

742

788

}

743

789

744

790

char *filename;

745

791

if(plugindir == NULL){

746

ret = asprintf(&filename, PDIR "/%s", dirst->d_name);

792

ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",

793

dirst->d_name));

747

794

} else {

748

ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);

795

ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",

796

plugindir,

797

dirst->d_name));

749

798

}

750

799

if(ret < 0){

751

800

perror("asprintf");

752

801

continue;

753

802

}

754

803

755

ret = stat(filename, &st);

756

if (ret == -1){

804

ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));

805

if(ret == -1){

757

806

perror("stat");

758

807

free(filename);

759

808

continue;

760

809

}

761

810

762

811

/* Ignore non-executable files */

763

if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){

812

if(not S_ISREG(st.st_mode)

813

or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){

764

814

if(debug){

765

815

fprintf(stderr, "Ignoring plugin dir entry \"%s\""

766

816

" with bad type or mode\n", filename);

812

862

}

813

863

814

864

int pipefd[2];

815

ret = pipe(pipefd);

816

if (ret == -1){

865

ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));

866

if(ret == -1){

817

867

perror("pipe");

818

868

exitstatus = EXIT_FAILURE;

819

869

goto fallback;

832

882

goto fallback;

833

883

}

834

884

/* Block SIGCHLD until process is safely in process list */

835

ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);

885

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,

886

&sigchld_action.sa_mask,

887

NULL));

836

888

if(ret < 0){

837

889

perror("sigprocmask");

838

890

exitstatus = EXIT_FAILURE;

839

891

goto fallback;

840

892

}

841

893

/* Starting a new process to be watched */

842

pid_t pid = fork();

894

pid_t pid;

895

do {

896

pid = fork();

897

} while(pid == -1 and errno == EINTR);

843

898

if(pid == -1){

844

899

perror("fork");

845

900

exitstatus = EXIT_FAILURE;

852

907

perror("sigaction");

853

908

_exit(EXIT_FAILURE);

854

909

}

855

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

910

ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

856

911

if(ret < 0){

857

912

perror("sigprocmask");

858

913

_exit(EXIT_FAILURE);

859

914

}

860

915

861

916

ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */

862

917

if(ret == -1){

863

918

perror("dup2");

883

938

/* no return */

884

939

}

885

940

/* Parent process */

886

close(pipefd[1]); /* Close unused write end of pipe */

941

TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of

942

pipe */

887

943

free(filename);

888

944

plugin *new_plugin = getplugin(dirst->d_name);

889

if (new_plugin == NULL){

945

if(new_plugin == NULL){

890

946

perror("getplugin");

891

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

947

ret = (int)(TEMP_FAILURE_RETRY

948

(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,

949

NULL)));

892

950

if(ret < 0){

893

951

perror("sigprocmask");

894

952

}

901

959

902

960

/* Unblock SIGCHLD so signal handler can be run if this process

903

961

has already completed */

904

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);

962

ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,

963

&sigchld_action.sa_mask,

964

NULL));

905

965

if(ret < 0){

906

966

perror("sigprocmask");

907

967

exitstatus = EXIT_FAILURE;

910

970

911

971

FD_SET(new_plugin->fd, &rfds_all);

912

972

913

if (maxfd < new_plugin->fd){

973

if(maxfd < new_plugin->fd){

914

974

maxfd = new_plugin->fd;

915

975

}

916

917

976

}

918

977

919

closedir(dir);

978

TEMP_FAILURE_RETRY(closedir(dir));

920

979

dir = NULL;

921

980

free_plugin(getplugin(NULL));

981

922

982

for(plugin *p = plugin_list; p != NULL; p = p->next){

923

983

if(p->pid != 0){

924

984

break;

929

989

free_plugin_list();

930

990

}

931

991

}

932

992

933

993

/* Main loop while running plugins exist */

934

994

while(plugin_list){

935

995

fd_set rfds = rfds_all;

936

996

int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);

937

if (select_ret == -1){

997

if(select_ret == -1 and errno != EINTR){

938

998

perror("select");

939

999

exitstatus = EXIT_FAILURE;

940

1000

goto fallback;

941

1001

}

942

1002

/* OK, now either a process completed, or something can be read

943

1003

from one of them */

944

for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){

1004

for(plugin *proc = plugin_list; proc != NULL;){

945

1005

/* Is this process completely done? */

946

if(proc->eof and proc->completed){

1006

if(proc->completed and proc->eof){

947

1007

/* Only accept the plugin output if it exited cleanly */

948

1008

if(not WIFEXITED(proc->status)

949

1009

or WEXITSTATUS(proc->status) != 0){

950

1010

/* Bad exit by plugin */

951

1011

952

1012

if(debug){

953

1013

if(WIFEXITED(proc->status)){

954

fprintf(stderr, "Plugin %u exited with status %d\n",

955

(unsigned int) (proc->pid),

1014

fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"

1015

" status %d\n", proc->name,

1016

(intmax_t) (proc->pid),

956

1017

WEXITSTATUS(proc->status));

957

} else if(WIFSIGNALED(proc->status)) {

958

fprintf(stderr, "Plugin %u killed by signal %d\n",

959

(unsigned int) (proc->pid),

960

WTERMSIG(proc->status));

1018

} else if(WIFSIGNALED(proc->status)){

1019

fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"

1020

" signal %d: %s\n", proc->name,

1021

(intmax_t) (proc->pid),

1022

WTERMSIG(proc->status),

1023

strsignal(WTERMSIG(proc->status)));

961

1024

} else if(WCOREDUMP(proc->status)){

962

fprintf(stderr, "Plugin %d dumped core\n",

963

(unsigned int) (proc->pid));

1025

fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"

1026

" core\n", proc->name, (intmax_t) (proc->pid));

964

1027

}

965

1028

}

966

1029

967

1030

/* Remove the plugin */

968

1031

FD_CLR(proc->fd, &rfds_all);

969

1032

970

1033

/* Block signal while modifying process_list */

971

ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);

1034

ret = (int)TEMP_FAILURE_RETRY(sigprocmask

1035

(SIG_BLOCK,

1036

&sigchld_action.sa_mask,

1037

NULL));

972

1038

if(ret < 0){

973

1039

perror("sigprocmask");

974

1040

exitstatus = EXIT_FAILURE;

975

1041

goto fallback;

976

1042

}

1043

1044

plugin *next_plugin = proc->next;

977

1045

free_plugin(proc);

1046

proc = next_plugin;

1047

978

1048

/* We are done modifying process list, so unblock signal */

979

ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,

980

NULL);

1049

ret = (int)(TEMP_FAILURE_RETRY

1050

(sigprocmask(SIG_UNBLOCK,

1051

&sigchld_action.sa_mask, NULL)));

981

1052

if(ret < 0){

982

1053

perror("sigprocmask");

983

1054

exitstatus = EXIT_FAILURE;

987

1058

if(plugin_list == NULL){

988

1059

break;

989

1060

}

1061

990

1062

continue;

991

1063

}

992

1064

993

1065

/* This process exited nicely, so print its buffer */

994

1066

995

1067

bool bret = print_out_password(proc->buffer,

996

1068

proc->buffer_length);

997

1069

if(not bret){

1004

1076

/* This process has not completed. Does it have any output? */

1005

1077

if(proc->eof or not FD_ISSET(proc->fd, &rfds)){

1006

1078

/* This process had nothing to say at this time */

1079

proc = proc->next;

1007

1080

continue;

1008

1081

}

1009

1082

/* Before reading, make the process' data buffer large enough */

1010

1083

if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){

1011

1084

proc->buffer = realloc(proc->buffer, proc->buffer_size

1012

1085

+ (size_t) BUFFER_SIZE);

1013

if (proc->buffer == NULL){

1086

if(proc->buffer == NULL){

1014

1087

perror("malloc");

1015

1088

exitstatus = EXIT_FAILURE;

1016

1089

goto fallback;

1018

1091

proc->buffer_size += BUFFER_SIZE;

1019

1092

}

1020

1093

/* Read from the process */

1021

ret = read(proc->fd, proc->buffer + proc->buffer_length,

1022

BUFFER_SIZE);

1023

if(ret < 0){

1094

sret = TEMP_FAILURE_RETRY(read(proc->fd,

1095

proc->buffer

1096

+ proc->buffer_length,

1097

BUFFER_SIZE));

1098

if(sret < 0){

1024

1099

/* Read error from this process; ignore the error */

1100

proc = proc->next;

1025

1101

continue;

1026

1102

}

1027

if(ret == 0){

1103

if(sret == 0){

1028

1104

/* got EOF */

1029

1105

proc->eof = true;

1030

1106

} else {

1031

proc->buffer_length += (size_t) ret;

1107

proc->buffer_length += (size_t) sret;

1032

1108

}

1033

1109

}

1034

1110

}

1035

1036

1111

1112

1037

1113

fallback:

1038

1114

1039

1115

if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){

1061

1137

perror("sigaction");

1062

1138

exitstatus = EXIT_FAILURE;

1063

1139

}

1064

1140

1065

1141

if(custom_argv != NULL){

1066

1142

for(char **arg = custom_argv+1; *arg != NULL; arg++){

1067

1143

free(*arg);

1073

1149

closedir(dir);

1074

1150

}

1075

1151

1076

/* Free the process list and kill the processes */

1152

/* Kill the processes */

1077

1153

for(plugin *p = plugin_list; p != NULL; p = p->next){

1078

1154

if(p->pid != 0){

1079

1155

close(p->fd);

1086

1162

}

1087

1163

1088

1164

/* Wait for any remaining child processes to terminate */

1089

do{

1165

do {

1090

1166

ret = wait(NULL);

1091

1167

} while(ret >= 0);

1092

1168

if(errno != ECHILD){

1093

1169

perror("wait");

1094

1170

}

1095

1171

1096

1172

free_plugin_list();

1097

1173

1098

1174

free(plugindir);