1
/* -*- coding: utf-8 -*- */
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* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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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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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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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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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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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, 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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#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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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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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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execv(), write(), read(),
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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argp_parse(), ARGP_ERR_UNKNOWN,
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ARGP_KEY_END, ARGP_KEY_ARG,
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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() */
66
#include <errno.h> /* errno, EBADF */
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#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
69
#define BUFFER_SIZE 256
71
#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 " VERSION;
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
typedef struct plugin{
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char *name; /* can be NULL or any plugin name */
85
/* Variables used for running processes*/
1
#include <stdio.h> /* popen, fileno */
2
#include <iso646.h> /* and, or, not */
3
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
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WIFEXITED, WEXITSTATUS, wait */
5
#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, 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, WEXITSTATUS */
14
#include <errno.h> /* errno */
18
typedef struct process{
92
volatile sig_atomic_t completed;
97
static plugin *plugin_list = NULL;
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/* Gets an existing plugin based on name,
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or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
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 */
110
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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copy_name = strdup(name);
117
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->argv = malloc(sizeof(char *) * 2);
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if(new_plugin->argv == 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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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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new_plugin->environ[0] = NULL;
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/* Append the new plugin to the list */
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plugin_list = new_plugin;
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/* Helper function for add_argument and add_environment */
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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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/* Make a copy of the new string */
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char *copy = strdup(new);
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/* Insert the copy */
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(*array)[*len] = copy;
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/* Add a new terminating NULL pointer to the last element */
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(*array)[*len] = NULL;
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/* Add to a plugin's argument vector */
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static bool add_argument(plugin *p, const char *arg){
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return add_to_char_array(arg, &(p->argv), &(p->argc));
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/* Add to a plugin's environment */
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static bool add_environment(plugin *p, const char *def, bool replace){
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/* namelen = length of name of environment variable */
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size_t namelen = (size_t)(strchrnul(def, '=') - def);
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/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
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if(strncmp(*e, def, namelen + 1) == 0){
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/* It already exists */
194
char *new = realloc(*e, strlen(def) + 1);
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return add_to_char_array(def, &(p->environ), &(p->envc));
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
static int set_cloexec_flag(int fd){
213
int ret = fcntl(fd, F_GETFD, 0);
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/* If reading the flags failed, return error indication now. */
218
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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/* Mark processes as completed when they exit, and save their exit
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
228
plugin *proc = plugin_list;
230
pid_t pid = waitpid(-1, &status, WNOHANG);
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/* Only still running child processes */
237
/* No child processes */
243
/* A child exited, find it in process_list */
244
while(proc != NULL and proc->pid != pid){
248
/* Process not found in process list */
251
proc->status = status;
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
260
for(size_t written = 0; written < length; written += (size_t)ret){
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
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for(char **arg = plugin_node->argv; *arg != NULL; arg++){
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free(plugin_node->argv);
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for(char **env = plugin_node->environ; *env != NULL; env++){
280
free(plugin_node->environ);
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free(plugin_node->buffer);
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
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/* First one - simple */
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plugin_list = plugin_list->next;
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/* Second one or later */
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for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
27
#define BUFFER_SIZE 256
306
29
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
30
char plugindir[] = "plugins.d";
31
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
312
33
struct dirent *dirst;
315
int ret, numchars, maxfd = 0;
321
int exitstatus = EXIT_SUCCESS;
322
struct sigaction old_sigchld_action;
323
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
324
.sa_flags = SA_NOCLDSTOP };
325
char **custom_argv = NULL;
328
/* Establish a signal handler */
329
sigemptyset(&sigchld_action.sa_mask);
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
333
exitstatus = EXIT_FAILURE;
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
339
exitstatus = EXIT_FAILURE;
343
/* The options we understand. */
344
struct argp_option options[] = {
345
{ .name = "global-options", .key = 'g',
346
.arg = "OPTION[,OPTION[,...]]",
347
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
350
.doc = "Environment variable passed to all plugins" },
351
{ .name = "options-for", .key = 'o',
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
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.arg = "PLUGIN:ENV=value",
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.doc = "Environment variable passed to specified plugin" },
357
{ .name = "disable", .key = 'd',
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.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
362
.doc = "Enable a specific plugin", .group = 1 },
363
{ .name = "plugin-dir", .key = 128,
365
.doc = "Specify a different plugin directory", .group = 2 },
366
{ .name = "config-file", .key = 129,
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
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.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
383
case 'g': /* --global-options */
386
while((plugin_option = strsep(&arg, ",")) != NULL){
387
if(plugin_option[0] == '\0'){
390
if(not add_argument(getplugin(NULL), plugin_option)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
397
case 'G': /* --global-env */
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
405
case 'o': /* --options-for */
407
char *plugin_name = strsep(&arg, ":");
408
if(plugin_name[0] == '\0'){
412
while((plugin_option = strsep(&arg, ",")) != NULL){
413
if(not add_argument(getplugin(plugin_name), plugin_option)){
414
perror("add_argument");
415
return ARGP_ERR_UNKNOWN;
420
case 'E': /* --env-for */
425
char *envdef = strchr(arg, ':');
430
if(not add_environment(getplugin(arg), envdef+1, true)){
431
perror("add_environment");
435
case 'd': /* --disable */
437
plugin *p = getplugin(arg);
439
return ARGP_ERR_UNKNOWN;
444
case 'e': /* --enable */
446
plugin *p = getplugin(arg);
448
return ARGP_ERR_UNKNOWN;
453
case 128: /* --plugin-dir */
455
plugindir = strdup(arg);
456
if(plugindir == NULL){
460
case 129: /* --config-file */
461
/* This is already done by parse_opt_config_file() */
463
case 130: /* --userid */
464
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
465
if(ret < 1 or tmpmax != (uid_t)tmpmax
466
or arg[numchars] != '\0'){
467
fprintf(stderr, "Bad user ID number: \"%s\", using %"
468
PRIdMAX "\n", arg, (intmax_t)uid);
473
case 131: /* --groupid */
474
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
475
if(ret < 1 or tmpmax != (gid_t)tmpmax
476
or arg[numchars] != '\0'){
477
fprintf(stderr, "Bad group ID number: \"%s\", using %"
478
PRIdMAX "\n", arg, (intmax_t)gid);
483
case 132: /* --debug */
487
* When adding more options before this line, remember to also add a
488
* "case" to the "parse_opt_config_file" function below.
491
/* Cryptsetup always passes an argument, which is an empty
492
string if "none" was specified in /etc/crypttab. So if
493
argument was empty, we ignore it silently. */
495
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
return ARGP_ERR_UNKNOWN;
506
/* This option parser is the same as parse_opt() above, except it
507
ignores everything but the --config-file option. */
508
error_t parse_opt_config_file(int key, char *arg,
509
__attribute__((unused))
510
struct argp_state *state){
512
case 'g': /* --global-options */
513
case 'G': /* --global-env */
514
case 'o': /* --options-for */
515
case 'E': /* --env-for */
516
case 'd': /* --disable */
517
case 'e': /* --enable */
518
case 128: /* --plugin-dir */
520
case 129: /* --config-file */
522
argfile = strdup(arg);
527
case 130: /* --userid */
528
case 131: /* --groupid */
529
case 132: /* --debug */
534
return ARGP_ERR_UNKNOWN;
539
struct argp argp = { .options = options,
540
.parser = parse_opt_config_file,
542
.doc = "Mandos plugin runner -- Run plugins" };
544
/* Parse using parse_opt_config_file() in order to get the custom
545
config file location, if any. */
546
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
547
if(ret == ARGP_ERR_UNKNOWN){
548
fprintf(stderr, "Unknown error while parsing arguments\n");
549
exitstatus = EXIT_FAILURE;
553
/* Reset to the normal argument parser */
554
argp.parser = parse_opt;
556
/* Open the configfile if available */
558
conffp = fopen(AFILE, "r");
560
conffp = fopen(argfile, "r");
563
char *org_line = NULL;
564
char *p, *arg, *new_arg, *line;
566
const char whitespace_delims[] = " \r\t\f\v\n";
567
const char comment_delim[] = "#";
570
custom_argv = malloc(sizeof(char*) * 2);
571
if(custom_argv == NULL){
573
exitstatus = EXIT_FAILURE;
576
custom_argv[0] = argv[0];
577
custom_argv[1] = NULL;
579
/* for each line in the config file, strip whitespace and ignore
582
sret = getline(&org_line, &size, conffp);
588
arg = strsep(&line, comment_delim);
589
while((p = strsep(&arg, whitespace_delims)) != NULL){
596
exitstatus = EXIT_FAILURE;
602
custom_argv = realloc(custom_argv, sizeof(char *)
603
* ((unsigned int) custom_argc + 1));
604
if(custom_argv == NULL){
606
exitstatus = EXIT_FAILURE;
610
custom_argv[custom_argc-1] = new_arg;
611
custom_argv[custom_argc] = NULL;
616
/* Check for harmful errors and go to fallback. Other errors might
617
not affect opening plugins */
618
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
620
exitstatus = EXIT_FAILURE;
624
/* If there was any arguments from configuration file,
625
pass them to parser as command arguments */
626
if(custom_argv != NULL){
627
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
629
if(ret == ARGP_ERR_UNKNOWN){
630
fprintf(stderr, "Unknown error while parsing arguments\n");
631
exitstatus = EXIT_FAILURE;
636
/* Parse actual command line arguments, to let them override the
638
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
639
if(ret == ARGP_ERR_UNKNOWN){
640
fprintf(stderr, "Unknown error while parsing arguments\n");
641
exitstatus = EXIT_FAILURE;
646
for(plugin *p = plugin_list; p != NULL; p=p->next){
647
fprintf(stderr, "Plugin: %s has %d arguments\n",
648
p->name ? p->name : "Global", p->argc - 1);
649
for(char **a = p->argv; *a != NULL; a++){
650
fprintf(stderr, "\tArg: %s\n", *a);
652
fprintf(stderr, "...and %d environment variables\n", p->envc);
653
for(char **a = p->environ; *a != NULL; a++){
654
fprintf(stderr, "\t%s\n", *a);
659
/* Strip permissions down to nobody */
669
if(plugindir == NULL){
672
dir = opendir(plugindir);
37
process *process_list = NULL;
39
dir = opendir(plugindir);
676
perror("Could not open plugin dir");
677
exitstatus = EXIT_FAILURE;
681
/* Set the FD_CLOEXEC flag on the directory, if possible */
683
int dir_fd = dirfd(dir);
685
ret = set_cloexec_flag(dir_fd);
687
perror("set_cloexec_flag");
688
exitstatus = EXIT_FAILURE;
696
/* Read and execute any executable in the plugin directory*/
42
fprintf(stderr, "Can not open directory\n");
698
49
dirst = readdir(dir);
700
/* All directory entries have been processed */
51
// All directory entries have been processed
701
52
if(dirst == NULL){
704
exitstatus = EXIT_FAILURE;
710
56
d_name_len = strlen(dirst->d_name);
712
/* Ignore dotfiles, backup files and other junk */
714
bool bad_name = false;
716
const char const *bad_prefixes[] = { ".", "#", NULL };
718
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
721
".dpkg-divert", NULL };
722
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
723
size_t pre_len = strlen(*pre);
724
if((d_name_len >= pre_len)
725
and strncmp((dirst->d_name), *pre, pre_len) == 0){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad prefix %s\n", dirst->d_name, *pre);
737
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
738
size_t suf_len = strlen(*suf);
739
if((d_name_len >= suf_len)
740
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
743
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
744
" with bad suffix %s\n", dirst->d_name, *suf);
757
if(plugindir == NULL){
758
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
760
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
ret = stat(filename, &st);
774
/* Ignore non-executable files */
775
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
777
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
778
" with bad type or mode\n", filename);
784
plugin *p = getplugin(dirst->d_name);
792
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
799
/* Add global arguments to argument list for this plugin */
800
plugin *g = getplugin(NULL);
802
for(char **a = g->argv + 1; *a != NULL; a++){
803
if(not add_argument(p, *a)){
804
perror("add_argument");
807
/* Add global environment variables */
808
for(char **e = g->environ; *e != NULL; e++){
809
if(not add_environment(p, *e, false)){
810
perror("add_environment");
815
/* If this plugin has any environment variables, we will call
816
using execve and need to duplicate the environment from this
818
if(p->environ[0] != NULL){
819
for(char **e = environ; *e != NULL; e++){
820
if(not add_environment(p, *e, false)){
821
perror("add_environment");
830
exitstatus = EXIT_FAILURE;
833
/* Ask OS to automatic close the pipe on exec */
834
ret = set_cloexec_flag(pipefd[0]);
836
perror("set_cloexec_flag");
837
exitstatus = EXIT_FAILURE;
840
ret = set_cloexec_flag(pipefd[1]);
842
perror("set_cloexec_flag");
843
exitstatus = EXIT_FAILURE;
846
/* Block SIGCHLD until process is safely in process list */
847
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
849
perror("sigprocmask");
850
exitstatus = EXIT_FAILURE;
853
/* Starting a new process to be watched */
857
exitstatus = EXIT_FAILURE;
861
/* this is the child process */
862
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
867
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
869
perror("sigprocmask");
873
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
880
/* If dir has no file descriptor, we could not set FD_CLOEXEC
881
above and must now close it manually here. */
58
// Ignore dotfiles and backup files
59
if (dirst->d_name[0] == '.'
60
or dirst->d_name[d_name_len - 1] == '~'){
64
char *filename = malloc(d_name_len + plugindir_len + 2);
65
strcpy(filename, plugindir);
66
strcat(filename, "/");
67
strcat(filename, dirst->d_name);
71
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
72
// Starting a new process to be watched
73
process *new_process = malloc(sizeof(process));
76
new_process->pid = fork();
77
if(new_process->pid == 0){
78
/* this is the child process */
884
if(p->environ[0] == NULL){
885
if(execv(filename, p->argv) < 0){
890
if(execve(filename, p->argv, p->environ) < 0){
898
close(pipefd[1]); /* Close unused write end of pipe */
900
plugin *new_plugin = getplugin(dirst->d_name);
901
if(new_plugin == NULL){
903
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
905
perror("sigprocmask");
907
exitstatus = EXIT_FAILURE;
911
new_plugin->pid = pid;
912
new_plugin->fd = pipefd[0];
914
/* Unblock SIGCHLD so signal handler can be run if this process
915
has already completed */
916
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
918
perror("sigprocmask");
919
exitstatus = EXIT_FAILURE;
923
FD_SET(new_plugin->fd, &rfds_all);
925
if(maxfd < new_plugin->fd){
926
maxfd = new_plugin->fd;
80
close(pipefd[0]); /* close unused read end of pipe */
81
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
82
/* create a new modified argument list */
83
char **new_argv = malloc(sizeof(char *) * (argc + 1));
84
new_argv[0] = filename;
85
for(int i = 1; i < argc; i++){
86
new_argv[i] = argv[i];
88
new_argv[argc] = NULL;
89
if(execv(filename, new_argv) < 0){
96
close(pipefd[1]); /* close unused write end of pipe */
97
new_process->fd = pipefd[0];
98
new_process->buffer = malloc(BUFFER_SIZE);
99
if (new_process->buffer == NULL){
103
new_process->buffer_size = BUFFER_SIZE;
104
new_process->buffer_length = 0;
105
FD_SET(new_process->fd, &rfds_orig);
107
if (maxfd < new_process->fd){
108
maxfd = new_process->fd;
112
new_process->next = process_list;
113
process_list = new_process;
932
free_plugin(getplugin(NULL));
934
for(plugin *p = plugin_list; p != NULL; p = p->next){
119
if (process_list != NULL){
121
fd_set rfds = rfds_orig;
122
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
123
if (select_ret == -1){
127
for(process *process_itr = process_list; process_itr != NULL;
128
process_itr = process_itr->next){
129
if(FD_ISSET(process_itr->fd, &rfds)){
130
if(process_itr->buffer_length + BUFFER_SIZE
131
> process_itr->buffer_size){
132
process_itr->buffer = realloc(process_itr->buffer,
133
process_itr->buffer_size
135
if (process_itr->buffer == NULL){
139
process_itr->buffer_size += BUFFER_SIZE;
141
ret = read(process_itr->fd, process_itr->buffer
142
+ process_itr->buffer_length, BUFFER_SIZE);
143
process_itr->buffer_length+=ret;
146
/* wait for process exit */
148
waitpid(process_itr->pid, &status, 0);
149
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
150
write(STDOUT_FILENO, process_itr->buffer,
151
process_itr->buffer_length);
154
FD_CLR(process_itr->fd, &rfds_orig);
164
for(process *process_itr = process_list; process_itr != NULL;
165
process_itr = process_itr->next){
166
close(process_itr->fd);
167
kill(process_itr->pid, SIGTERM);
168
free(process_itr->buffer);
939
fprintf(stderr, "No plugin processes started. Incorrect plugin"
945
/* Main loop while running plugins exist */
947
fd_set rfds = rfds_all;
948
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
949
if(select_ret == -1){
951
exitstatus = EXIT_FAILURE;
954
/* OK, now either a process completed, or something can be read
956
for(plugin *proc = plugin_list; proc != NULL;){
957
/* Is this process completely done? */
958
if(proc->completed and proc->eof){
959
/* Only accept the plugin output if it exited cleanly */
960
if(not WIFEXITED(proc->status)
961
or WEXITSTATUS(proc->status) != 0){
962
/* Bad exit by plugin */
965
if(WIFEXITED(proc->status)){
966
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
967
" status %d\n", proc->name,
968
(intmax_t) (proc->pid),
969
WEXITSTATUS(proc->status));
970
} else if(WIFSIGNALED(proc->status)){
971
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
972
" signal %d\n", proc->name,
973
(intmax_t) (proc->pid),
974
WTERMSIG(proc->status));
975
} else if(WCOREDUMP(proc->status)){
976
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
977
" core\n", proc->name, (intmax_t) (proc->pid));
981
/* Remove the plugin */
982
FD_CLR(proc->fd, &rfds_all);
984
/* Block signal while modifying process_list */
985
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
perror("sigprocmask");
988
exitstatus = EXIT_FAILURE;
992
plugin *next_plugin = proc->next;
996
/* We are done modifying process list, so unblock signal */
997
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
perror("sigprocmask");
1001
exitstatus = EXIT_FAILURE;
1005
if(plugin_list == NULL){
1012
/* This process exited nicely, so print its buffer */
1014
bool bret = print_out_password(proc->buffer,
1015
proc->buffer_length);
1017
perror("print_out_password");
1018
exitstatus = EXIT_FAILURE;
1023
/* This process has not completed. Does it have any output? */
1024
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1025
/* This process had nothing to say at this time */
1029
/* Before reading, make the process' data buffer large enough */
1030
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1031
proc->buffer = realloc(proc->buffer, proc->buffer_size
1032
+ (size_t) BUFFER_SIZE);
1033
if(proc->buffer == NULL){
1035
exitstatus = EXIT_FAILURE;
1038
proc->buffer_size += BUFFER_SIZE;
1040
/* Read from the process */
1041
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
/* Read error from this process; ignore the error */
1052
proc->buffer_length += (size_t) sret;
1060
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1061
/* Fallback if all plugins failed, none are found or an error
1064
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1065
char *passwordbuffer = getpass("Password: ");
1066
size_t len = strlen(passwordbuffer);
1067
/* Strip trailing newline */
1068
if(len > 0 and passwordbuffer[len-1] == '\n'){
1069
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
bret = print_out_password(passwordbuffer, len);
1074
perror("print_out_password");
1075
exitstatus = EXIT_FAILURE;
1079
/* Restore old signal handler */
1080
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1082
perror("sigaction");
1083
exitstatus = EXIT_FAILURE;
1086
if(custom_argv != NULL){
1087
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1097
/* Kill the processes */
1098
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
ret = kill(p->pid, SIGTERM);
1102
if(ret == -1 and errno != ESRCH){
1103
/* Set-uid proccesses might not get closed */
1109
/* Wait for any remaining child processes to terminate */
1113
if(errno != ECHILD){