21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
#include <stdio.h> /* popen(), fileno(), fprintf(),
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(),
25
32
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() */
26
43
#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() */
31
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
45
readdir(), closedir(), dirfd() */
34
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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(),
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() */
45
56
#include <errno.h> /* errno */
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
52
typedef struct process{
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 */
68
#define BUFFER_SIZE 256
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
const char *argp_program_version = "plugin-runner " VERSION;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
84
/* Variables used for running processes*/
56
88
size_t buffer_size;
57
89
size_t buffer_length;
61
typedef struct plugin{
62
char *name; /* can be NULL or any plugin name */
91
volatile bool completed;
66
93
struct plugin *next;
69
plugin *getplugin(char *name, plugin **plugin_list){
70
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
static plugin *plugin_list = NULL;
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
71
103
if ((p->name == name)
72
104
or (p->name and name and (strcmp(p->name, name) == 0))){
76
108
/* Create a new plugin */
77
109
plugin *new_plugin = malloc(sizeof(plugin));
78
110
if (new_plugin == NULL){
82
new_plugin->name = name;
113
char *copy_name = NULL;
115
copy_name = strdup(name);
116
if(copy_name == NULL){
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
83
126
new_plugin->argv = malloc(sizeof(char *) * 2);
84
127
if (new_plugin->argv == NULL){
88
new_plugin->argv[0] = name;
132
new_plugin->argv[0] = copy_name;
89
133
new_plugin->argv[1] = NULL;
91
new_plugin->disabled = false;
92
new_plugin->next = *plugin_list;
135
new_plugin->environ = malloc(sizeof(char *));
136
if(new_plugin->environ == NULL){
138
free(new_plugin->argv);
142
new_plugin->environ[0] = NULL;
93
144
/* Append the new plugin to the list */
94
*plugin_list = new_plugin;
145
plugin_list = new_plugin;
95
146
return new_plugin;
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;
149
/* Helper function for add_argument and add_environment */
150
static bool add_to_char_array(const char *new, char ***array,
152
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
159
/* Make a copy of the new string */
160
char *copy = strdup(new);
164
/* Insert the copy */
165
(*array)[*len] = copy;
167
/* Add a new terminating NULL pointer to the last element */
168
(*array)[*len] = NULL;
172
/* Add to a plugin's argument vector */
173
static bool add_argument(plugin *p, const char *arg){
177
return add_to_char_array(arg, &(p->argv), &(p->argc));
180
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
192
char *new = realloc(*e, strlen(def) + 1);
202
return add_to_char_array(def, &(p->environ), &(p->envc));
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>";
221
/* Mark processes as completed when they exit, and save their exit
223
static void handle_sigchld(__attribute__((unused)) int sig){
225
plugin *proc = plugin_list;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
229
/* Only still running child processes */
233
if (errno != ECHILD){
236
/* No child processes */
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
245
/* Process not found in process list */
248
proc->status = status;
249
proc->completed = true;
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
256
for(size_t written = 0; written < length; written += (size_t)ret){
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
133
302
int main(int argc, char *argv[]){
134
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
303
char *plugindir = NULL;
304
char *argfile = NULL;
135
306
size_t d_name_len;
137
308
struct dirent *dirst;
140
311
int ret, maxfd = 0;
141
process *process_list = NULL;
142
314
bool debug = false;
143
315
int exitstatus = EXIT_SUCCESS;
316
struct sigaction old_sigchld_action;
317
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
318
.sa_flags = SA_NOCLDSTOP };
319
char **custom_argv = NULL;
322
/* Establish a signal handler */
323
sigemptyset(&sigchld_action.sa_mask);
324
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
327
exitstatus = EXIT_FAILURE;
330
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
333
exitstatus = EXIT_FAILURE;
145
337
/* The options we understand. */
146
338
struct argp_option options[] = {
147
339
{ .name = "global-options", .key = 'g',
148
340
.arg = "OPTION[,OPTION[,...]]",
149
341
.doc = "Options passed to all plugins" },
342
{ .name = "global-env", .key = 'G',
344
.doc = "Environment variable passed to all plugins" },
150
345
{ .name = "options-for", .key = 'o',
151
346
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
152
347
.doc = "Options passed only to specified plugin" },
348
{ .name = "env-for", .key = 'E',
349
.arg = "PLUGIN:ENV=value",
350
.doc = "Environment variable passed to specified plugin" },
153
351
{ .name = "disable", .key = 'd',
155
353
.doc = "Disable a specific plugin", .group = 1 },
354
{ .name = "enable", .key = 'e',
356
.doc = "Enable a specific plugin", .group = 1 },
156
357
{ .name = "plugin-dir", .key = 128,
157
358
.arg = "DIRECTORY",
158
359
.doc = "Specify a different plugin directory", .group = 2 },
159
{ .name = "debug", .key = 129,
160
.doc = "Debug mode", .group = 3 },
360
{ .name = "config-file", .key = 129,
362
.doc = "Specify a different configuration file", .group = 2 },
363
{ .name = "userid", .key = 130,
364
.arg = "ID", .flags = 0,
365
.doc = "User ID the plugins will run as", .group = 3 },
366
{ .name = "groupid", .key = 131,
367
.arg = "ID", .flags = 0,
368
.doc = "Group ID the plugins will run as", .group = 3 },
369
{ .name = "debug", .key = 132,
370
.doc = "Debug mode", .group = 4 },
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;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
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;
377
case 'g': /* --global-options */
380
while((p = strsep(&arg, ",")) != NULL){
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
391
case 'G': /* --global-env */
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
399
case 'o': /* --options-for */
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
410
while((p = strsep(&opt, ",")) != NULL){
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
421
case 'E': /* --env-for */
426
char *envdef = strchr(arg, ':');
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
436
case 'd': /* --disable */
438
plugin *p = getplugin(arg);
440
return ARGP_ERR_UNKNOWN;
445
case 'e': /* --enable */
447
plugin *p = getplugin(arg);
449
return ARGP_ERR_UNKNOWN;
454
case 128: /* --plugin-dir */
456
plugindir = strdup(arg);
457
if(plugindir == NULL){
461
case 129: /* --config-file */
462
/* This is already done by parse_opt_config_file() */
464
case 130: /* --userid */
465
uid = (uid_t)strtol(arg, NULL, 10);
467
case 131: /* --groupid */
468
gid = (gid_t)strtol(arg, NULL, 10);
470
case 132: /* --debug */
202
473
case ARGP_KEY_ARG:
208
return ARGP_ERR_UNKNOWN;
213
plugin *plugin_list = NULL;
215
struct argp argp = { .options = options, .parser = parse_opt,
474
/* Cryptsetup always passes an argument, which is an empty
475
string if "none" was specified in /etc/crypttab. So if
476
argument was empty, we ignore it silently. */
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
484
return ARGP_ERR_UNKNOWN;
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
503
case 129: /* --config-file */
505
argfile = strdup(arg);
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
517
return ARGP_ERR_UNKNOWN;
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
217
525
.doc = "Mandos plugin runner -- Run plugins" };
219
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
exitstatus = EXIT_FAILURE;
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
543
conffp = fopen(argfile, "r");
546
char *org_line = NULL;
547
char *p, *arg, *new_arg, *line;
550
const char whitespace_delims[] = " \r\t\f\v\n";
551
const char comment_delim[] = "#";
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
557
exitstatus = EXIT_FAILURE;
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
563
/* for each line in the config file, strip whitespace and ignore
566
sret = getline(&org_line, &size, conffp);
572
arg = strsep(&line, comment_delim);
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
580
exitstatus = EXIT_FAILURE;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
590
exitstatus = EXIT_FAILURE;
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
600
/* Check for harmful errors and go to fallback. Other errors might
601
not affect opening plugins */
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
604
exitstatus = EXIT_FAILURE;
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
610
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
620
/* Parse actual command line arguments, to let them override the
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
222
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
301
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
302
if (filename == NULL){
304
exitstatus =EXIT_FAILURE;
751
ret = stat(filename, &st);
307
strcpy(filename, plugindir);
308
strcat(filename, "/");
309
strcat(filename, dirst->d_name);
758
/* Ignore non-executable files */
313
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
315
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
316
762
" with bad type or mode\n", filename);
320
if(getplugin(dirst->d_name, &plugin_list)->disabled){
768
plugin *p = getplugin(dirst->d_name);
322
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
327
// Starting a new process to be watched
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");
329
811
ret = pipe(pipefd);
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++){
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 */
342
838
pid_t pid = fork();
841
exitstatus = EXIT_FAILURE;
344
845
/* this is the child process */
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){
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. */
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
874
if(execve(filename, p->argv, p->environ) < 0){
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;
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;
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);
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
fprintf(stderr, "No plugin processes started. Incorrect plugin"
928
/* Main loop while running plugins exist */
930
fd_set rfds = rfds_all;
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
932
if (select_ret == -1){
934
exitstatus = EXIT_FAILURE;
937
/* OK, now either a process completed, or something can be read
939
for(plugin *proc = plugin_list; proc != NULL;){
940
/* Is this process completely done? */
941
if(proc->eof and proc->completed){
942
/* Only accept the plugin output if it exited cleanly */
943
if(not WIFEXITED(proc->status)
944
or WEXITSTATUS(proc->status) != 0){
945
/* Bad exit by plugin */
948
if(WIFEXITED(proc->status)){
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
951
WEXITSTATUS(proc->status));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
962
/* Remove the plugin */
963
FD_CLR(proc->fd, &rfds_all);
965
/* Block signal while modifying process_list */
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
973
plugin *next_plugin = proc->next;
977
/* We are done modifying process list, so unblock signal */
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
986
if(plugin_list == NULL){
993
/* This process exited nicely, so print its buffer */
995
bool bret = print_out_password(proc->buffer,
996
proc->buffer_length);
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1004
/* This process has not completed. Does it have any output? */
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1006
/* This process had nothing to say at this time */
1010
/* Before reading, make the process' data buffer large enough */
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1016
exitstatus = EXIT_FAILURE;
1019
proc->buffer_size += BUFFER_SIZE;
1021
/* Read from the process */
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1025
/* Read error from this process; ignore the error */
1033
proc->buffer_length += (size_t) ret;
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1042
/* Fallback if all plugins failed, none are found or an error
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1046
char *passwordbuffer = getpass("Password: ");
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1053
bret = print_out_password(passwordbuffer, len);
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1060
/* Restore old signal handler */
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1067
if(custom_argv != NULL){
1068
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1078
/* Kill the processes */
1079
for(plugin *p = plugin_list; p != NULL; p = p->next){
1082
ret = kill(p->pid, SIGTERM);
1083
if(ret == -1 and errno != ESRCH){
1084
/* Set-uid proccesses might not get closed */
1090
/* Wait for any remaining child processes to terminate */
1094
if(errno != ECHILD){
464
1103
return exitstatus;