21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
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{
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>";
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
85
/* Variables used for running processes*/
47
89
size_t buffer_size;
48
90
size_t buffer_length;
52
typedef struct plugin{
53
char *name; /* can be "global" and any plugin name */
92
volatile bool completed;
56
94
struct plugin *next;
59
plugin *getplugin(char *name, plugin **plugin_list){
60
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
99
/* Gets an existing plugin based on name,
100
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){
61
104
if ((p->name == name)
62
105
or (p->name and name and (strcmp(p->name, name) == 0))){
66
109
/* Create a new plugin */
67
110
plugin *new_plugin = malloc(sizeof(plugin));
68
111
if (new_plugin == NULL){
72
new_plugin->name = name;
114
char *copy_name = NULL;
116
copy_name = strdup(name);
117
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
73
127
new_plugin->argv = malloc(sizeof(char *) * 2);
74
128
if (new_plugin->argv == NULL){
78
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
79
134
new_plugin->argv[1] = NULL;
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
139
free(new_plugin->argv);
143
new_plugin->environ[0] = NULL;
81
145
/* Append the new plugin to the list */
82
new_plugin->next = *plugin_list;
83
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
84
147
return new_plugin;
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[] = "";
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
165
/* Insert the copy */
166
(*array)[*len] = copy;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
193
char *new = realloc(*e, strlen(def) + 1);
203
return add_to_char_array(def, &(p->environ), &(p->envc));
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
static int set_cloexec_flag(int fd)
213
int ret = fcntl(fd, F_GETFD, 0);
214
/* 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);
223
/* Mark processes as completed when they exit, and save their exit
225
void handle_sigchld(__attribute__((unused)) int sig){
227
plugin *proc = plugin_list;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
231
/* Only still running child processes */
235
if (errno != ECHILD){
238
/* No child processes */
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
247
/* Process not found in process list */
250
proc->status = status;
251
proc->completed = true;
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
258
for(size_t written = 0; written < length; written += (size_t)ret){
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
109
304
int main(int argc, char *argv[]){
110
char plugindir[] = "plugins.d";
111
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
305
char *plugindir = NULL;
306
char *argfile = NULL;
113
310
struct dirent *dirst;
116
313
int ret, maxfd = 0;
117
process *process_list = NULL;
317
int exitstatus = EXIT_SUCCESS;
318
struct sigaction old_sigchld_action;
319
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
320
.sa_flags = SA_NOCLDSTOP };
321
char **custom_argv = NULL;
324
/* Establish a signal handler */
325
sigemptyset(&sigchld_action.sa_mask);
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
329
exitstatus = EXIT_FAILURE;
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
exitstatus = EXIT_FAILURE;
119
339
/* The options we understand. */
120
340
struct argp_option options[] = {
121
341
{ .name = "global-options", .key = 'g',
122
.arg = "option[,option[,...]]", .flags = 0,
123
.doc = "Options effecting all plugins" },
342
.arg = "OPTION[,OPTION[,...]]",
343
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
346
.doc = "Environment variable passed to all plugins" },
124
347
{ .name = "options-for", .key = 'o',
125
.arg = "plugin:option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting only specified plugins" },
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
349
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
353
{ .name = "disable", .key = 'd',
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
358
.doc = "Enable a specific plugin", .group = 1 },
359
{ .name = "plugin-dir", .key = 128,
361
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
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);
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
379
case 'g': /* --global-options */
382
while((p = strsep(&arg, ",")) != NULL){
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
393
case 'G': /* --global-env */
398
char *envdef = strdup(arg);
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
407
case 'o': /* --options-for */
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0' or arg == NULL){
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0' or opt == NULL){
418
while((p = strsep(&opt, ",")) != NULL){
422
if(not add_argument(getplugin(p_name), p)){
423
perror("add_argument");
424
return ARGP_ERR_UNKNOWN;
429
case 'E': /* --env-for */
434
char *envdef = strchr(arg, ':');
438
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(not add_environment(getplugin(p_name), envdef, true)){
444
perror("add_environment");
448
case 'd': /* --disable */
450
plugin *p = getplugin(arg);
452
return ARGP_ERR_UNKNOWN;
457
case 'e': /* --enable */
459
plugin *p = getplugin(arg);
461
return ARGP_ERR_UNKNOWN;
466
case 128: /* --plugin-dir */
467
plugindir = strdup(arg);
468
if(plugindir == NULL){
472
case 129: /* --config-file */
473
/* This is already done by parse_opt_config_file() */
475
case 130: /* --userid */
476
uid = (uid_t)strtol(arg, NULL, 10);
478
case 131: /* --groupid */
479
gid = (gid_t)strtol(arg, NULL, 10);
481
case 132: /* --debug */
485
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
490
return ARGP_ERR_UNKNOWN;
495
/* This option parser is the same as parse_opt() above, except it
496
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) {
501
case 'g': /* --global-options */
502
case 'G': /* --global-env */
503
case 'o': /* --options-for */
504
case 'E': /* --env-for */
505
case 'd': /* --disable */
506
case 'e': /* --enable */
507
case 128: /* --plugin-dir */
509
case 129: /* --config-file */
510
argfile = strdup(arg);
515
case 130: /* --userid */
516
case 131: /* --groupid */
517
case 132: /* --debug */
522
return ARGP_ERR_UNKNOWN;
527
struct argp argp = { .options = options,
528
.parser = parse_opt_config_file,
530
.doc = "Mandos plugin runner -- Run plugins" };
532
/* Parse using the parse_opt_config_file in order to get the custom
533
config file location, if any. */
534
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
535
if (ret == ARGP_ERR_UNKNOWN){
536
fprintf(stderr, "Unknown error while parsing arguments\n");
537
exitstatus = EXIT_FAILURE;
541
/* Reset to the normal argument parser */
542
argp.parser = parse_opt;
544
/* Open the configfile if available */
545
if (argfile == NULL){
546
conffp = fopen(AFILE, "r");
548
conffp = fopen(argfile, "r");
551
char *org_line = NULL;
552
char *p, *arg, *new_arg, *line;
555
const char whitespace_delims[] = " \r\t\f\v\n";
556
const char comment_delim[] = "#";
559
custom_argv = malloc(sizeof(char*) * 2);
560
if(custom_argv == NULL){
562
exitstatus = EXIT_FAILURE;
565
custom_argv[0] = argv[0];
566
custom_argv[1] = NULL;
568
/* for each line in the config file, strip whitespace and ignore
571
sret = getline(&org_line, &size, conffp);
577
arg = strsep(&line, comment_delim);
578
while((p = strsep(&arg, whitespace_delims)) != NULL){
585
exitstatus = EXIT_FAILURE;
591
custom_argv = realloc(custom_argv, sizeof(char *)
592
* ((unsigned int) custom_argc + 1));
593
if(custom_argv == NULL){
595
exitstatus = EXIT_FAILURE;
599
custom_argv[custom_argc-1] = new_arg;
600
custom_argv[custom_argc] = NULL;
605
/* Check for harmful errors and go to fallback. Other errors might
606
not affect opening plugins */
607
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
609
exitstatus = EXIT_FAILURE;
613
/* If there was any arguments from configuration file,
614
pass them to parser as command arguments */
615
if(custom_argv != NULL){
616
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
618
if (ret == ARGP_ERR_UNKNOWN){
619
fprintf(stderr, "Unknown error while parsing arguments\n");
620
exitstatus = EXIT_FAILURE;
625
/* Parse actual command line arguments, to let them override the
627
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
628
if (ret == ARGP_ERR_UNKNOWN){
629
fprintf(stderr, "Unknown error while parsing arguments\n");
630
exitstatus = EXIT_FAILURE;
635
for(plugin *p = plugin_list; p != NULL; p=p->next){
636
fprintf(stderr, "Plugin: %s has %d arguments\n",
637
p->name ? p->name : "Global", p->argc - 1);
638
for(char **a = p->argv; *a != NULL; a++){
639
fprintf(stderr, "\tArg: %s\n", *a);
641
fprintf(stderr, "...and %u environment variables\n", p->envc);
642
for(char **a = p->environ; *a != NULL; a++){
643
fprintf(stderr, "\t%s\n", *a);
648
/* Strip permissions down to nobody */
658
if (plugindir == NULL){
661
dir = opendir(plugindir);
185
fprintf(stderr, "Can not open directory\n");
665
perror("Could not open plugin dir");
666
exitstatus = EXIT_FAILURE;
670
/* Set the FD_CLOEXEC flag on the directory, if possible */
672
int dir_fd = dirfd(dir);
674
ret = set_cloexec_flag(dir_fd);
676
perror("set_cloexec_flag");
677
exitstatus = EXIT_FAILURE;
685
/* Read and execute any executable in the plugin directory*/
192
687
dirst = readdir(dir);
194
// All directory entries have been processed
689
/* All directory entries have been processed */
195
690
if(dirst == NULL){
693
exitstatus = EXIT_FAILURE;
199
699
d_name_len = strlen(dirst->d_name);
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 */
701
/* Ignore dotfiles, backup files and other junk */
703
bool bad_name = false;
705
const char const *bad_prefixes[] = { ".", "#", NULL };
707
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
709
".dpkg-divert", NULL };
710
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
711
size_t pre_len = strlen(*pre);
712
if((d_name_len >= pre_len)
713
and strncmp((dirst->d_name), *pre, pre_len) == 0){
715
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
716
" with bad prefix %s\n", dirst->d_name, *pre);
725
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
726
size_t suf_len = strlen(*suf);
727
if((d_name_len >= suf_len)
728
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad suffix %s\n", dirst->d_name, *suf);
745
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
751
ret = stat(filename, &st);
758
/* Ignore non-executable files */
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
768
plugin *p = getplugin(dirst->d_name);
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
783
/* Add global arguments to argument list for this plugin */
784
plugin *g = getplugin(NULL);
786
for(char **a = g->argv + 1; *a != NULL; a++){
787
if(not add_argument(p, *a)){
788
perror("add_argument");
791
/* Add global environment variables */
792
for(char **e = g->environ; *e != NULL; e++){
793
if(not add_environment(p, *e, false)){
794
perror("add_environment");
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
802
if(p->environ[0] != NULL){
803
for(char **e = environ; *e != NULL; e++){
804
if(not add_environment(p, *e, false)){
805
perror("add_environment");
814
exitstatus = EXIT_FAILURE;
817
/* Ask OS to automatic close the pipe on exec */
818
ret = set_cloexec_flag(pipefd[0]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
824
ret = set_cloexec_flag(pipefd[1]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
830
/* Block SIGCHLD until process is safely in process list */
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
837
/* Starting a new process to be watched */
841
exitstatus = EXIT_FAILURE;
845
/* this is the child process */
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
851
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
853
perror("sigprocmask");
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
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);
239
for(char **a = g->argv + 1; *a != NULL; a++){
868
if(p->environ[0] == NULL){
242
869
if(execv(filename, p->argv) < 0){
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;
874
if(execve(filename, p->argv, p->environ) < 0){
882
close(pipefd[1]); /* Close unused write end of pipe */
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
889
perror("sigprocmask");
891
exitstatus = EXIT_FAILURE;
895
new_plugin->pid = pid;
896
new_plugin->fd = pipefd[0];
898
/* Unblock SIGCHLD so signal handler can be run if this process
899
has already completed */
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
907
FD_SET(new_plugin->fd, &rfds_all);
909
if (maxfd < new_plugin->fd){
910
maxfd = new_plugin->fd;
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);
918
for(plugin *p = plugin_list; p != NULL; p = p->next){
923
fprintf(stderr, "No plugin processes started. Incorrect plugin"
929
/* Main loop while running plugins exist */
931
fd_set rfds = rfds_all;
932
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
933
if (select_ret == -1){
935
exitstatus = EXIT_FAILURE;
938
/* OK, now either a process completed, or something can be read
940
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
941
/* Is this process completely done? */
942
if(proc->eof and proc->completed){
943
/* Only accept the plugin output if it exited cleanly */
944
if(not WIFEXITED(proc->status)
945
or WEXITSTATUS(proc->status) != 0){
946
/* Bad exit by plugin */
949
if(WIFEXITED(proc->status)){
950
fprintf(stderr, "Plugin %u exited with status %d\n",
951
(unsigned int) (proc->pid),
952
WEXITSTATUS(proc->status));
953
} else if(WIFSIGNALED(proc->status)) {
954
fprintf(stderr, "Plugin %u killed by signal %d\n",
955
(unsigned int) (proc->pid),
956
WTERMSIG(proc->status));
957
} else if(WCOREDUMP(proc->status)){
958
fprintf(stderr, "Plugin %d dumped core\n",
959
(unsigned int) (proc->pid));
963
/* Remove the plugin */
964
FD_CLR(proc->fd, &rfds_all);
966
/* Block signal while modifying process_list */
967
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
969
perror("sigprocmask");
970
exitstatus = EXIT_FAILURE;
974
/* We are done modifying process list, so unblock signal */
975
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
978
perror("sigprocmask");
979
exitstatus = EXIT_FAILURE;
983
if(plugin_list == NULL){
989
/* This process exited nicely, so print its buffer */
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
994
perror("print_out_password");
995
exitstatus = EXIT_FAILURE;
1000
/* This process has not completed. Does it have any output? */
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1002
/* This process had nothing to say at this time */
1005
/* Before reading, make the process' data buffer large enough */
1006
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1007
proc->buffer = realloc(proc->buffer, proc->buffer_size
1008
+ (size_t) BUFFER_SIZE);
1009
if (proc->buffer == NULL){
1011
exitstatus = EXIT_FAILURE;
1014
proc->buffer_size += BUFFER_SIZE;
1016
/* Read from the process */
1017
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1020
/* Read error from this process; ignore the error */
1027
proc->buffer_length += (size_t) ret;
1035
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1036
/* Fallback if all plugins failed, none are found or an error
1039
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1040
char *passwordbuffer = getpass("Password: ");
1041
size_t len = strlen(passwordbuffer);
1042
/* Strip trailing newline */
1043
if(len > 0 and passwordbuffer[len-1] == '\n'){
1044
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1047
bret = print_out_password(passwordbuffer, len);
1049
perror("print_out_password");
1050
exitstatus = EXIT_FAILURE;
1054
/* Restore old signal handler */
1055
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1057
perror("sigaction");
1058
exitstatus = EXIT_FAILURE;
1061
if(custom_argv != NULL){
1062
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1072
/* Free the process list and kill the processes */
1073
for(plugin *p = plugin_list; p != NULL; p = p->next){
1076
ret = kill(p->pid, SIGTERM);
1077
if(ret == -1 and errno != ESRCH){
1078
/* Set-uid proccesses might not get closed */
1084
/* Wait for any remaining child processes to terminate */
1088
if(errno != ECHILD){