21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
67
#define BUFFER_SIZE 256
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
typedef struct plugin{
76
char *name; /* can be NULL or any plugin name */
83
/* Variables used for running processes*/
24
#include <stdio.h> /* popen, fileno */
25
#include <iso646.h> /* and, or, not */
26
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
27
WIFEXITED, WEXITSTATUS, wait */
28
#include <sys/wait.h> /* wait */
29
#include <dirent.h> /* DIR, opendir */
30
#include <sys/stat.h> /* stat, struct stat */
31
#include <unistd.h> /* stat, struct stat, chdir */
32
#include <stdlib.h> /* EXIT_FAILURE */
33
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
35
#include <string.h> /* strlen, strcpy, strcat */
36
#include <stdbool.h> /* true */
37
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
38
#include <errno.h> /* errno */
39
#include <argp.h> /* argp */
43
typedef struct process{
87
47
size_t buffer_size;
88
48
size_t buffer_length;
90
volatile bool completed;
52
typedef struct plugin{
53
char *name; /* can be "global" and any plugin name */
92
56
struct plugin *next;
95
static plugin *plugin_list = NULL;
97
/* Gets an existing plugin based on name,
98
or if none is found, creates a new one */
99
static plugin *getplugin(char *name){
100
/* Check for exiting plugin with that name */
101
for (plugin *p = plugin_list; p != NULL; p = p->next){
59
plugin *getplugin(char *name, plugin **plugin_list){
60
for (plugin *p = *plugin_list; p != NULL; p = p->next){
102
61
if ((p->name == name)
103
62
or (p->name and name and (strcmp(p->name, name) == 0))){
107
66
/* Create a new plugin */
108
67
plugin *new_plugin = malloc(sizeof(plugin));
109
68
if (new_plugin == NULL){
112
char *copy_name = NULL;
114
copy_name = strdup(name);
115
if(copy_name == NULL){
120
*new_plugin = (plugin) { .name = copy_name,
123
.next = plugin_list };
72
new_plugin->name = name;
125
73
new_plugin->argv = malloc(sizeof(char *) * 2);
126
74
if (new_plugin->argv == NULL){
131
new_plugin->argv[0] = copy_name;
78
new_plugin->argv[0] = name;
132
79
new_plugin->argv[1] = NULL;
134
new_plugin->environ = malloc(sizeof(char *));
135
if(new_plugin->environ == NULL){
137
free(new_plugin->argv);
141
new_plugin->environ[0] = NULL;
143
81
/* Append the new plugin to the list */
144
plugin_list = new_plugin;
82
new_plugin->next = *plugin_list;
83
*plugin_list = new_plugin;
145
84
return new_plugin;
148
/* Helper function for add_argument and add_environment */
149
static bool add_to_char_array(const char *new, char ***array,
151
/* Resize the pointed-to array to hold one more pointer */
152
*array = realloc(*array, sizeof(char *)
153
* (size_t) ((*len) + 2));
158
/* Make a copy of the new string */
159
char *copy = strdup(new);
163
/* Insert the copy */
164
(*array)[*len] = copy;
166
/* Add a new terminating NULL pointer to the last element */
167
(*array)[*len] = NULL;
171
/* Add to a plugin's argument vector */
172
static bool add_argument(plugin *p, const char *arg){
176
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
/* Add to a plugin's environment */
180
static bool add_environment(plugin *p, const char *def, bool replace){
184
/* namelen = length of name of environment variable */
185
size_t namelen = (size_t)(strchrnul(def, '=') - def);
186
/* Search for this environment variable */
187
for(char **e = p->environ; *e != NULL; e++){
188
if(strncmp(*e, def, namelen + 1) == 0){
189
/* It already exists */
191
char *new = realloc(*e, strlen(def) + 1);
201
return add_to_char_array(def, &(p->environ), &(p->envc));
205
* Based on the example in the GNU LibC manual chapter 13.13 "File
207
* *Note File Descriptor Flags:(libc)Descriptor Flags.
209
static int set_cloexec_flag(int fd){
210
int ret = fcntl(fd, F_GETFD, 0);
211
/* If reading the flags failed, return error indication now. */
215
/* Store modified flag word in the descriptor. */
216
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
/* Mark processes as completed when they exit, and save their exit
222
static void handle_sigchld(__attribute__((unused)) int sig){
224
plugin *proc = plugin_list;
226
pid_t pid = waitpid(-1, &status, WNOHANG);
228
/* Only still running child processes */
232
if (errno != ECHILD){
235
/* No child processes */
239
/* A child exited, find it in process_list */
240
while(proc != NULL and proc->pid != pid){
244
/* Process not found in process list */
247
proc->status = status;
248
proc->completed = true;
252
/* Prints out a password to stdout */
253
static bool print_out_password(const char *buffer, size_t length){
255
for(size_t written = 0; written < length; written += (size_t)ret){
256
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
265
/* Removes and free a plugin from the plugin list */
266
static void free_plugin(plugin *plugin_node){
268
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
271
free(plugin_node->argv);
272
for(char **env = plugin_node->environ; *env != NULL; env++){
275
free(plugin_node->environ);
276
free(plugin_node->buffer);
278
/* Removes the plugin from the singly-linked list */
279
if(plugin_node == plugin_list){
280
/* First one - simple */
281
plugin_list = plugin_list->next;
283
/* Second one or later */
284
for(plugin *p = plugin_list; p != NULL; p = p->next){
285
if(p->next == plugin_node){
286
p->next = plugin_node->next;
295
static void free_plugin_list(void){
296
while(plugin_list != NULL){
297
free_plugin(plugin_list);
87
void addarguments(plugin *p, char *arg){
88
p->argv[p->argc] = arg;
89
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
95
p->argv[p->argc] = NULL;
98
#define BUFFER_SIZE 256
100
const char *argp_program_version =
101
"plugbasedclient 0.9";
102
const char *argp_program_bug_address =
103
"<mandos@fukt.bsnet.se>";
105
"Mandos plugin runner -- Run Mandos plugins";
106
/* A description of the arguments we accept. */
107
static char args_doc[] = "";
301
109
int main(int argc, char *argv[]){
302
char *plugindir = NULL;
303
char *argfile = NULL;
110
char plugindir[] = "plugins.d";
111
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
307
113
struct dirent *dirst;
310
116
int ret, maxfd = 0;
314
int exitstatus = EXIT_SUCCESS;
315
struct sigaction old_sigchld_action;
316
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
317
.sa_flags = SA_NOCLDSTOP };
318
char **custom_argv = NULL;
321
/* Establish a signal handler */
322
sigemptyset(&sigchld_action.sa_mask);
323
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
326
exitstatus = EXIT_FAILURE;
329
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
332
exitstatus = EXIT_FAILURE;
117
process *process_list = NULL;
336
119
/* The options we understand. */
337
120
struct argp_option options[] = {
338
121
{ .name = "global-options", .key = 'g',
339
.arg = "OPTION[,OPTION[,...]]",
340
.doc = "Options passed to all plugins" },
341
{ .name = "global-env", .key = 'G',
343
.doc = "Environment variable passed to all plugins" },
122
.arg = "option[,option[,...]]", .flags = 0,
123
.doc = "Options effecting all plugins" },
344
124
{ .name = "options-for", .key = 'o',
345
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
346
.doc = "Options passed only to specified plugin" },
347
{ .name = "env-for", .key = 'E',
348
.arg = "PLUGIN:ENV=value",
349
.doc = "Environment variable passed to specified plugin" },
350
{ .name = "disable", .key = 'd',
352
.doc = "Disable a specific plugin", .group = 1 },
353
{ .name = "enable", .key = 'e',
355
.doc = "Enable a specific plugin", .group = 1 },
356
{ .name = "plugin-dir", .key = 128,
358
.doc = "Specify a different plugin directory", .group = 2 },
359
{ .name = "config-file", .key = 129,
361
.doc = "Specify a different configuration file", .group = 2 },
362
{ .name = "userid", .key = 130,
363
.arg = "ID", .flags = 0,
364
.doc = "User ID the plugins will run as", .group = 3 },
365
{ .name = "groupid", .key = 131,
366
.arg = "ID", .flags = 0,
367
.doc = "Group ID the plugins will run as", .group = 3 },
368
{ .name = "debug", .key = 132,
369
.doc = "Debug mode", .group = 4 },
125
.arg = "plugin:option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting only specified plugins" },
373
error_t parse_opt (int key, char *arg, __attribute__((unused))
374
struct argp_state *state) {
376
case 'g': /* --global-options */
379
while((p = strsep(&arg, ",")) != NULL){
383
if(not add_argument(getplugin(NULL), p)){
384
perror("add_argument");
385
return ARGP_ERR_UNKNOWN;
390
case 'G': /* --global-env */
394
if(not add_environment(getplugin(NULL), arg, true)){
395
perror("add_environment");
398
case 'o': /* --options-for */
400
char *p_name = strsep(&arg, ":");
401
if(p_name[0] == '\0' or arg == NULL){
404
char *opt = strsep(&arg, ":");
405
if(opt[0] == '\0' or opt == NULL){
409
while((p = strsep(&opt, ",")) != NULL){
413
if(not add_argument(getplugin(p_name), p)){
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
uid = (uid_t)strtol(arg, NULL, 10);
466
case 131: /* --groupid */
467
gid = (gid_t)strtol(arg, NULL, 10);
469
case 132: /* --debug */
473
/* Cryptsetup always passes an argument, which is an empty
474
string if "none" was specified in /etc/crypttab. So if
475
argument was empty, we ignore it silently. */
477
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
483
return ARGP_ERR_UNKNOWN;
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
494
case 'g': /* --global-options */
495
case 'G': /* --global-env */
496
case 'o': /* --options-for */
497
case 'E': /* --env-for */
498
case 'd': /* --disable */
499
case 'e': /* --enable */
500
case 128: /* --plugin-dir */
502
case 129: /* --config-file */
504
argfile = strdup(arg);
509
case 130: /* --userid */
510
case 131: /* --groupid */
511
case 132: /* --debug */
516
return ARGP_ERR_UNKNOWN;
521
struct argp argp = { .options = options,
522
.parser = parse_opt_config_file,
524
.doc = "Mandos plugin runner -- Run plugins" };
526
/* Parse using the parse_opt_config_file in order to get the custom
527
config file location, if any. */
528
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
529
if (ret == ARGP_ERR_UNKNOWN){
530
fprintf(stderr, "Unknown error while parsing arguments\n");
531
exitstatus = EXIT_FAILURE;
535
/* Reset to the normal argument parser */
536
argp.parser = parse_opt;
538
/* Open the configfile if available */
539
if (argfile == NULL){
540
conffp = fopen(AFILE, "r");
542
conffp = fopen(argfile, "r");
545
char *org_line = NULL;
546
char *p, *arg, *new_arg, *line;
549
const char whitespace_delims[] = " \r\t\f\v\n";
550
const char comment_delim[] = "#";
553
custom_argv = malloc(sizeof(char*) * 2);
554
if(custom_argv == NULL){
556
exitstatus = EXIT_FAILURE;
559
custom_argv[0] = argv[0];
560
custom_argv[1] = NULL;
562
/* for each line in the config file, strip whitespace and ignore
565
sret = getline(&org_line, &size, conffp);
571
arg = strsep(&line, comment_delim);
572
while((p = strsep(&arg, whitespace_delims)) != NULL){
579
exitstatus = EXIT_FAILURE;
585
custom_argv = realloc(custom_argv, sizeof(char *)
586
* ((unsigned int) custom_argc + 1));
587
if(custom_argv == NULL){
589
exitstatus = EXIT_FAILURE;
593
custom_argv[custom_argc-1] = new_arg;
594
custom_argv[custom_argc] = NULL;
599
/* Check for harmful errors and go to fallback. Other errors might
600
not affect opening plugins */
601
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
exitstatus = EXIT_FAILURE;
607
/* If there was any arguments from configuration file,
608
pass them to parser as command arguments */
609
if(custom_argv != NULL){
610
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
if (ret == ARGP_ERR_UNKNOWN){
613
fprintf(stderr, "Unknown error while parsing arguments\n");
614
exitstatus = EXIT_FAILURE;
619
/* Parse actual command line arguments, to let them override the
621
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
622
if (ret == ARGP_ERR_UNKNOWN){
623
fprintf(stderr, "Unknown error while parsing arguments\n");
624
exitstatus = EXIT_FAILURE;
629
for(plugin *p = plugin_list; p != NULL; p=p->next){
630
fprintf(stderr, "Plugin: %s has %d arguments\n",
631
p->name ? p->name : "Global", p->argc - 1);
632
for(char **a = p->argv; *a != NULL; a++){
633
fprintf(stderr, "\tArg: %s\n", *a);
635
fprintf(stderr, "...and %u environment variables\n", p->envc);
636
for(char **a = p->environ; *a != NULL; a++){
637
fprintf(stderr, "\t%s\n", *a);
642
/* Strip permissions down to nobody */
652
if (plugindir == NULL){
655
dir = opendir(plugindir);
130
error_t parse_opt (int key, char *arg, struct argp_state *state) {
131
/* Get the INPUT argument from `argp_parse', which we
132
know is a pointer to our arguments structure. */
133
plugin **plugins = state->input;
137
char *p = strtok(arg, ",");
139
addarguments(getplugin(NULL, plugins), p);
140
p = strtok(NULL, ",");
146
char *name = strtok(arg, ":");
147
char *p = strtok(NULL, ":");
150
addarguments(getplugin(name, plugins), p);
151
p = strtok(NULL, ",");
161
return ARGP_ERR_UNKNOWN;
166
plugin *plugin_list = NULL;
168
struct argp argp = { .options = options, .parser = parse_opt,
169
.args_doc = args_doc, .doc = doc };
171
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
173
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
174
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
175
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
176
/* fprintf(stderr, "\tArg: %s\n", *a); */
182
dir = opendir(plugindir);
659
perror("Could not open plugin dir");
660
exitstatus = EXIT_FAILURE;
664
/* Set the FD_CLOEXEC flag on the directory, if possible */
666
int dir_fd = dirfd(dir);
668
ret = set_cloexec_flag(dir_fd);
670
perror("set_cloexec_flag");
671
exitstatus = EXIT_FAILURE;
679
/* Read and execute any executable in the plugin directory*/
185
fprintf(stderr, "Can not open directory\n");
681
192
dirst = readdir(dir);
683
/* All directory entries have been processed */
194
// All directory entries have been processed
684
195
if(dirst == NULL){
687
exitstatus = EXIT_FAILURE;
693
199
d_name_len = strlen(dirst->d_name);
695
/* Ignore dotfiles, backup files and other junk */
697
bool bad_name = false;
699
const char const *bad_prefixes[] = { ".", "#", NULL };
701
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-divert", NULL };
704
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
705
size_t pre_len = strlen(*pre);
706
if((d_name_len >= pre_len)
707
and strncmp((dirst->d_name), *pre, pre_len) == 0){
709
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
710
" with bad prefix %s\n", dirst->d_name, *pre);
719
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
720
size_t suf_len = strlen(*suf);
721
if((d_name_len >= suf_len)
722
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
726
" with bad suffix %s\n", dirst->d_name, *suf);
739
if(plugindir == NULL){
740
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
742
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
ret = stat(filename, &st);
756
/* Ignore non-executable files */
757
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
759
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
760
" with bad type or mode\n", filename);
766
plugin *p = getplugin(dirst->d_name);
774
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
781
/* Add global arguments to argument list for this plugin */
782
plugin *g = getplugin(NULL);
201
// Ignore dotfiles and backup files
202
if (dirst->d_name[0] == '.'
203
or dirst->d_name[d_name_len - 1] == '~'){
207
char *filename = malloc(d_name_len + plugindir_len + 2);
208
strcpy(filename, plugindir);
209
strcat(filename, "/");
210
strcat(filename, dirst->d_name);
214
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
215
// Starting a new process to be watched
216
process *new_process = malloc(sizeof(process));
223
new_process->pid = fork();
224
if(new_process->pid == 0){
225
/* this is the child process */
227
close(pipefd[0]); /* close unused read end of pipe */
228
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
230
basename = strrchr(filename, '/');
231
if (basename == NULL){
236
plugin *p = getplugin(basename, &plugin_list);
238
plugin *g = getplugin(NULL, &plugin_list);
784
239
for(char **a = g->argv + 1; *a != NULL; a++){
785
if(not add_argument(p, *a)){
786
perror("add_argument");
789
/* Add global environment variables */
790
for(char **e = g->environ; *e != NULL; e++){
791
if(not add_environment(p, *e, false)){
792
perror("add_environment");
797
/* If this plugin has any environment variables, we will call
798
using execve and need to duplicate the environment from this
800
if(p->environ[0] != NULL){
801
for(char **e = environ; *e != NULL; e++){
802
if(not add_environment(p, *e, false)){
803
perror("add_environment");
812
exitstatus = EXIT_FAILURE;
815
/* Ask OS to automatic close the pipe on exec */
816
ret = set_cloexec_flag(pipefd[0]);
818
perror("set_cloexec_flag");
819
exitstatus = EXIT_FAILURE;
822
ret = set_cloexec_flag(pipefd[1]);
824
perror("set_cloexec_flag");
825
exitstatus = EXIT_FAILURE;
828
/* Block SIGCHLD until process is safely in process list */
829
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
831
perror("sigprocmask");
832
exitstatus = EXIT_FAILURE;
835
/* Starting a new process to be watched */
839
exitstatus = EXIT_FAILURE;
843
/* this is the child process */
844
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
849
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
perror("sigprocmask");
855
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
862
/* If dir has no file descriptor, we could not set FD_CLOEXEC
863
above and must now close it manually here. */
866
if(p->environ[0] == NULL){
867
242
if(execv(filename, p->argv) < 0){
872
if(execve(filename, p->argv, p->environ) < 0){
880
close(pipefd[1]); /* Close unused write end of pipe */
882
plugin *new_plugin = getplugin(dirst->d_name);
883
if (new_plugin == NULL){
885
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
887
perror("sigprocmask");
889
exitstatus = EXIT_FAILURE;
893
new_plugin->pid = pid;
894
new_plugin->fd = pipefd[0];
896
/* Unblock SIGCHLD so signal handler can be run if this process
897
has already completed */
898
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
900
perror("sigprocmask");
901
exitstatus = EXIT_FAILURE;
905
FD_SET(new_plugin->fd, &rfds_all);
907
if (maxfd < new_plugin->fd){
908
maxfd = new_plugin->fd;
249
close(pipefd[1]); /* close unused write end of pipe */
250
new_process->fd = pipefd[0];
251
new_process->buffer = malloc(BUFFER_SIZE);
252
if (new_process->buffer == NULL){
256
new_process->buffer_size = BUFFER_SIZE;
257
new_process->buffer_length = 0;
258
FD_SET(new_process->fd, &rfds_orig);
260
if (maxfd < new_process->fd){
261
maxfd = new_process->fd;
265
new_process->next = process_list;
266
process_list = new_process;
916
for(plugin *p = plugin_list; p != NULL; p = p->next){
272
if (process_list != NULL){
274
fd_set rfds = rfds_orig;
275
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
276
if (select_ret == -1){
280
for(process *process_itr = process_list; process_itr != NULL;
281
process_itr = process_itr->next){
282
if(FD_ISSET(process_itr->fd, &rfds)){
283
if(process_itr->buffer_length + BUFFER_SIZE
284
> process_itr->buffer_size){
285
process_itr->buffer = realloc(process_itr->buffer,
286
process_itr->buffer_size
287
+ (size_t) BUFFER_SIZE);
288
if (process_itr->buffer == NULL){
292
process_itr->buffer_size += BUFFER_SIZE;
294
ret = read(process_itr->fd, process_itr->buffer
295
+ process_itr->buffer_length, BUFFER_SIZE);
297
/* Read error from this process; ignore it */
300
process_itr->buffer_length += (size_t) ret;
303
/* wait for process exit */
305
waitpid(process_itr->pid, &status, 0);
306
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
307
for(size_t written = 0;
308
written < process_itr->buffer_length;){
309
ret = write(STDOUT_FILENO,
310
process_itr->buffer + written,
311
process_itr->buffer_length - written);
316
written += (size_t)ret;
320
FD_CLR(process_itr->fd, &rfds_orig);
330
for(process *process_itr = process_list; process_itr != NULL;
331
process_itr = process_itr->next){
332
close(process_itr->fd);
333
kill(process_itr->pid, SIGTERM);
334
free(process_itr->buffer);
921
fprintf(stderr, "No plugin processes started. Incorrect plugin"
927
/* Main loop while running plugins exist */
929
fd_set rfds = rfds_all;
930
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
931
if (select_ret == -1){
933
exitstatus = EXIT_FAILURE;
936
/* OK, now either a process completed, or something can be read
938
for(plugin *proc = plugin_list; proc != NULL;){
939
/* Is this process completely done? */
940
if(proc->eof and proc->completed){
941
/* Only accept the plugin output if it exited cleanly */
942
if(not WIFEXITED(proc->status)
943
or WEXITSTATUS(proc->status) != 0){
944
/* Bad exit by plugin */
947
if(WIFEXITED(proc->status)){
948
fprintf(stderr, "Plugin %u exited with status %d\n",
949
(unsigned int) (proc->pid),
950
WEXITSTATUS(proc->status));
951
} else if(WIFSIGNALED(proc->status)) {
952
fprintf(stderr, "Plugin %u killed by signal %d\n",
953
(unsigned int) (proc->pid),
954
WTERMSIG(proc->status));
955
} else if(WCOREDUMP(proc->status)){
956
fprintf(stderr, "Plugin %d dumped core\n",
957
(unsigned int) (proc->pid));
961
/* Remove the plugin */
962
FD_CLR(proc->fd, &rfds_all);
964
/* Block signal while modifying process_list */
965
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
967
perror("sigprocmask");
968
exitstatus = EXIT_FAILURE;
972
/* We are done modifying process list, so unblock signal */
973
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
976
perror("sigprocmask");
977
exitstatus = EXIT_FAILURE;
981
if(plugin_list == NULL){
985
plugin *next_plugin = proc->next;
991
/* This process exited nicely, so print its buffer */
993
bool bret = print_out_password(proc->buffer,
994
proc->buffer_length);
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1002
/* This process has not completed. Does it have any output? */
1003
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1004
/* This process had nothing to say at this time */
1008
/* Before reading, make the process' data buffer large enough */
1009
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1010
proc->buffer = realloc(proc->buffer, proc->buffer_size
1011
+ (size_t) BUFFER_SIZE);
1012
if (proc->buffer == NULL){
1014
exitstatus = EXIT_FAILURE;
1017
proc->buffer_size += BUFFER_SIZE;
1019
/* Read from the process */
1020
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
/* Read error from this process; ignore the error */
1031
proc->buffer_length += (size_t) ret;
1039
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1040
/* Fallback if all plugins failed, none are found or an error
1043
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1044
char *passwordbuffer = getpass("Password: ");
1045
size_t len = strlen(passwordbuffer);
1046
/* Strip trailing newline */
1047
if(len > 0 and passwordbuffer[len-1] == '\n'){
1048
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1051
bret = print_out_password(passwordbuffer, len);
1053
perror("print_out_password");
1054
exitstatus = EXIT_FAILURE;
1058
/* Restore old signal handler */
1059
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1061
perror("sigaction");
1062
exitstatus = EXIT_FAILURE;
1065
if(custom_argv != NULL){
1066
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1076
/* Free the process list and kill the processes */
1077
for(plugin *p = plugin_list; p != NULL; p = p->next){
1080
ret = kill(p->pid, SIGTERM);
1081
if(ret == -1 and errno != ESRCH){
1082
/* Set-uid proccesses might not get closed */
1088
/* Wait for any remaining child processes to terminate */
1092
if(errno != ECHILD){