22
21
* Contact the authors at <mandos@fukt.bsnet.se>.
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
32
25
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
26
#include <iso646.h> /* and, or, not */
27
#include <sys/types.h> /* DIR, opendir(), stat(), struct stat,
28
waitpid(), WIFEXITED(),
29
WEXITSTATUS(), wait() */
30
#include <sys/wait.h> /* wait() */
44
31
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
46
34
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
#include <string.h> /* strsep, strlen(), asprintf() */
36
#include <fcntl.h> /* fcntl() */
37
#include <stddef.h> /* NULL */
38
#include <stdlib.h> /* EXIT_FAILURE */
39
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
40
FD_SET(), FD_ISSET() */
41
#include <string.h> /* strlen(), strcpy(), strcat() */
42
#include <stdbool.h> /* true */
43
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
56
45
#include <errno.h> /* errno */
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
sigaddset(), sigaction(),
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill() */
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
69
#define BUFFER_SIZE 256
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
52
typedef struct process{
77
61
typedef struct plugin{
78
62
char *name; /* can be NULL or any plugin name */
85
/* Variables used for running processes*/
92
volatile sig_atomic_t completed;
94
66
struct plugin *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){
105
or (p->name and name and (strcmp(p->name, name) == 0))){
69
plugin *getplugin(char *name, plugin **plugin_list){
70
for (plugin *p = *plugin_list; p != NULL; p = p->next){
72
or (p->name and name and (strcmp(p->name, name) == 0))){
109
76
/* Create a new plugin */
110
77
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
114
char *copy_name = NULL;
116
copy_name = strdup(name);
117
if(copy_name == NULL){
123
*new_plugin = (plugin){ .name = copy_name,
126
.next = plugin_list };
78
if (new_plugin == NULL){
82
new_plugin->name = name;
128
83
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
84
if (new_plugin->argv == NULL){
134
new_plugin->argv[0] = copy_name;
88
new_plugin->argv[0] = name;
135
89
new_plugin->argv[1] = NULL;
137
new_plugin->environ = malloc(sizeof(char *));
138
if(new_plugin->environ == NULL){
140
free(new_plugin->argv);
144
new_plugin->environ[0] = NULL;
91
new_plugin->disabled = false;
92
new_plugin->next = *plugin_list;
146
93
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
94
*plugin_list = new_plugin;
148
95
return new_plugin;
151
/* Helper function for add_argument and add_environment */
152
static bool add_to_char_array(const char *new, char ***array,
154
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
161
/* Make a copy of the new string */
162
char *copy = strdup(new);
166
/* Insert the copy */
167
(*array)[*len] = copy;
169
/* Add a new terminating NULL pointer to the last element */
170
(*array)[*len] = NULL;
174
/* Add to a plugin's argument vector */
175
static bool add_argument(plugin *p, const char *arg){
179
return add_to_char_array(arg, &(p->argv), &(p->argc));
182
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
194
char *new = realloc(*e, strlen(def) + 1);
204
return add_to_char_array(def, &(p->environ), &(p->envc));
98
void addargument(plugin *p, char *arg){
99
p->argv[p->argc] = arg;
100
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
101
if (p->argv == NULL){
106
p->argv[p->argc] = NULL;
223
/* 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);
232
/* 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){
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
288
/* Second one or later */
289
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);
126
#define BUFFER_SIZE 256
128
const char *argp_program_version =
129
"plugbasedclient 0.9";
130
const char *argp_program_bug_address =
131
"<mandos@fukt.bsnet.se>";
306
133
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
134
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
310
135
size_t d_name_len;
312
137
struct dirent *dirst;
315
int ret, numchars, maxfd = 0;
141
process *process_list = NULL;
320
142
bool debug = false;
321
143
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
145
/* The options we understand. */
344
146
struct argp_option options[] = {
345
147
{ .name = "global-options", .key = 'g',
346
148
.arg = "OPTION[,OPTION[,...]]",
347
149
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
350
.doc = "Environment variable passed to all plugins" },
351
150
{ .name = "options-for", .key = 'o',
352
151
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
152
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
355
.arg = "PLUGIN:ENV=value",
356
.doc = "Environment variable passed to specified plugin" },
357
153
{ .name = "disable", .key = 'd',
359
155
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
362
.doc = "Enable a specific plugin", .group = 1 },
363
156
{ .name = "plugin-dir", .key = 128,
364
157
.arg = "DIRECTORY",
365
158
.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,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
159
{ .name = "debug", .key = 129,
160
.doc = "Debug mode", .group = 3 },
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
383
case 'g': /* --global-options */
386
while((p = strsep(&arg, ",")) != NULL){
390
if(not add_argument(getplugin(NULL), p)){
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 *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
416
while((p = strsep(&opt, ",")) != NULL){
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
427
case 'E': /* --env-for */
432
char *envdef = strchr(arg, ':');
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
442
case 'd': /* --disable */
444
plugin *p = getplugin(arg);
446
return ARGP_ERR_UNKNOWN;
451
case 'e': /* --enable */
453
plugin *p = getplugin(arg);
455
return ARGP_ERR_UNKNOWN;
460
case 128: /* --plugin-dir */
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
490
case 132: /* --debug */
164
error_t parse_opt (int key, char *arg, struct argp_state *state) {
165
/* Get the INPUT argument from `argp_parse', which we
166
know is a pointer to our plugin list pointer. */
167
plugin **plugins = state->input;
171
char *p = strtok(arg, ",");
173
addargument(getplugin(NULL, plugins), p);
174
p = strtok(NULL, ",");
180
char *name = strtok(arg, ":");
181
char *p = strtok(NULL, ":");
185
addargument(getplugin(name, plugins), p);
186
p = strtok(NULL, ",");
193
getplugin(arg, plugins)->disabled = true;
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
508
return ARGP_ERR_UNKNOWN;
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
527
case 129: /* --config-file */
529
argfile = strdup(arg);
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
541
return ARGP_ERR_UNKNOWN;
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
208
return ARGP_ERR_UNKNOWN;
213
plugin *plugin_list = NULL;
215
struct argp argp = { .options = options, .parser = parse_opt,
549
217
.doc = "Mandos plugin runner -- Run plugins" };
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
563
/* Open the configfile if available */
565
conffp = fopen(AFILE, "r");
567
conffp = fopen(argfile, "r");
570
char *org_line = NULL;
571
char *p, *arg, *new_arg, *line;
573
const char whitespace_delims[] = " \r\t\f\v\n";
574
const char comment_delim[] = "#";
577
custom_argv = malloc(sizeof(char*) * 2);
578
if(custom_argv == NULL){
580
exitstatus = EXIT_FAILURE;
583
custom_argv[0] = argv[0];
584
custom_argv[1] = NULL;
586
/* for each line in the config file, strip whitespace and ignore
589
sret = getline(&org_line, &size, conffp);
595
arg = strsep(&line, comment_delim);
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
603
exitstatus = EXIT_FAILURE;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
613
exitstatus = EXIT_FAILURE;
617
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
623
/* Check for harmful errors and go to fallback. Other errors might
624
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
627
exitstatus = EXIT_FAILURE;
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
633
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
643
/* Parse actual command line arguments, to let them override the
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
219
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
653
222
for(plugin *p = plugin_list; p != NULL; p=p->next){
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
774
ret = stat(filename, &st);
301
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
302
if (filename == NULL){
304
exitstatus =EXIT_FAILURE;
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
307
strcpy(filename, plugindir);
308
strcat(filename, "/");
309
strcat(filename, dirst->d_name);
313
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
315
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
785
316
" with bad type or mode\n", filename);
791
plugin *p = getplugin(dirst->d_name);
320
if(getplugin(dirst->d_name, &plugin_list)->disabled){
799
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
322
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
806
/* Add global arguments to argument list for this plugin */
807
plugin *g = getplugin(NULL);
809
for(char **a = g->argv + 1; *a != NULL; a++){
810
if(not add_argument(p, *a)){
811
perror("add_argument");
814
/* Add global environment variables */
815
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
817
perror("add_environment");
822
/* If this plugin has any environment variables, we will call
823
using execve and need to duplicate the environment from this
825
if(p->environ[0] != NULL){
826
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
828
perror("add_environment");
327
// Starting a new process to be watched
834
329
ret = pipe(pipefd);
837
exitstatus = EXIT_FAILURE;
840
/* Ask OS to automatic close the pipe on exec */
841
ret = set_cloexec_flag(pipefd[0]);
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
847
ret = set_cloexec_flag(pipefd[1]);
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
853
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
860
/* Starting a new process to be watched */
334
plugin *p = getplugin(dirst->d_name, &plugin_list);
336
/* Add global arguments to argument list for this plugin */
337
plugin *g = getplugin(NULL, &plugin_list);
338
for(char **a = g->argv + 1; *a != NULL; a++){
861
342
pid_t pid = fork();
864
exitstatus = EXIT_FAILURE;
868
344
/* this is the child process */
869
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
876
perror("sigprocmask");
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
887
/* If dir has no file descriptor, we could not set FD_CLOEXEC
888
above and must now close it manually here. */
891
if(p->environ[0] == NULL){
892
if(execv(filename, p->argv) < 0){
897
if(execve(filename, p->argv, p->environ) < 0){
346
close(pipefd[0]); /* close unused read end of pipe */
347
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
352
if(execv(filename, p->argv) < 0){
905
close(pipefd[1]); /* Close unused write end of pipe */
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
912
perror("sigprocmask");
914
exitstatus = EXIT_FAILURE;
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
921
/* Unblock SIGCHLD so signal handler can be run if this process
922
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
930
FD_SET(new_plugin->fd, &rfds_all);
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
359
close(pipefd[1]); /* close unused write end of pipe */
360
process *new_process = malloc(sizeof(process));
361
if (new_process == NULL){
363
exitstatus = EXIT_FAILURE;
367
new_process->fd = pipefd[0];
368
new_process->buffer = malloc(BUFFER_SIZE);
369
if (new_process->buffer == NULL){
371
exitstatus = EXIT_FAILURE;
374
new_process->buffer_size = BUFFER_SIZE;
375
new_process->buffer_length = 0;
376
FD_SET(new_process->fd, &rfds_all);
378
if (maxfd < new_process->fd){
379
maxfd = new_process->fd;
383
new_process->next = process_list;
384
process_list = new_process;
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
389
if (process_list != NULL){
391
fd_set rfds = rfds_all;
392
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
393
if (select_ret == -1){
397
for(process *process_itr = process_list; process_itr != NULL;
398
process_itr = process_itr->next){
399
if(FD_ISSET(process_itr->fd, &rfds)){
400
if(process_itr->buffer_length + BUFFER_SIZE
401
> process_itr->buffer_size){
402
process_itr->buffer = realloc(process_itr->buffer,
403
process_itr->buffer_size
404
+ (size_t) BUFFER_SIZE);
405
if (process_itr->buffer == NULL){
409
process_itr->buffer_size += BUFFER_SIZE;
411
ret = read(process_itr->fd, process_itr->buffer
412
+ process_itr->buffer_length, BUFFER_SIZE);
414
/* Read error from this process; ignore it */
417
process_itr->buffer_length += (size_t) ret;
420
/* wait for process exit */
422
waitpid(process_itr->pid, &status, 0);
423
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
424
for(size_t written = 0;
425
written < process_itr->buffer_length;){
426
ret = write(STDOUT_FILENO,
427
process_itr->buffer + written,
428
process_itr->buffer_length - written);
433
written += (size_t)ret;
437
FD_CLR(process_itr->fd, &rfds_all);
447
for(process *process_itr = process_list; process_itr != NULL;
448
process_itr = process_itr->next){
449
close(process_itr->fd);
450
kill(process_itr->pid, SIGTERM);
451
free(process_itr->buffer);
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
951
/* Main loop while running plugins exist */
953
fd_set rfds = rfds_all;
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
957
exitstatus = EXIT_FAILURE;
960
/* OK, now either a process completed, or something can be read
962
for(plugin *proc = plugin_list; proc != NULL;){
963
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
965
/* Only accept the plugin output if it exited cleanly */
966
if(not WIFEXITED(proc->status)
967
or WEXITSTATUS(proc->status) != 0){
968
/* Bad exit by plugin */
971
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
974
WEXITSTATUS(proc->status));
975
} else if(WIFSIGNALED(proc->status)){
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
979
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
985
/* Remove the plugin */
986
FD_CLR(proc->fd, &rfds_all);
988
/* Block signal while modifying process_list */
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
996
plugin *next_plugin = proc->next;
1000
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1009
if(plugin_list == NULL){
1016
/* This process exited nicely, so print its buffer */
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1027
/* This process has not completed. Does it have any output? */
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
/* This process had nothing to say at this time */
1033
/* Before reading, make the process' data buffer large enough */
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
1039
exitstatus = EXIT_FAILURE;
1042
proc->buffer_size += BUFFER_SIZE;
1044
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
/* Read error from this process; ignore the error */
1056
proc->buffer_length += (size_t) sret;
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1076
bret = print_out_password(passwordbuffer, len);
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1083
/* Restore old signal handler */
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1090
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1113
/* Wait for any remaining child processes to terminate */
1117
if(errno != ECHILD){
1126
464
return exitstatus;