21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
26
#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(),
27
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(),
41
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
44
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
33
#include <sys/wait.h> /* wait() */
34
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
46
readdir(), closedir(), dirfd() */
37
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
48
58
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
53
72
#define BUFFER_SIZE 256
57
typedef struct process{
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
typedef struct plugin{
81
char *name; /* can be NULL or any plugin name */
88
/* Variables used for running processes*/
61
92
size_t buffer_size;
62
93
size_t buffer_length;
95
volatile sig_atomic_t completed;
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
74
97
struct plugin *next;
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
80
or (p->name and name and (strcmp(p->name, name) == 0))){
100
static plugin *plugin_list = NULL;
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
or (p->name and name and (strcmp(p->name, name) == 0))){
84
112
/* Create a new plugin */
85
plugin *new_plugin = malloc(sizeof(plugin));
86
if (new_plugin == NULL){
90
new_plugin->name = name;
91
new_plugin->argv = malloc(sizeof(char *) * 2);
92
if (new_plugin->argv == NULL){
96
new_plugin->argv[0] = name;
113
plugin *new_plugin = NULL;
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
120
char *copy_name = NULL;
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
125
if(copy_name == NULL){
131
*new_plugin = (plugin){ .name = copy_name,
134
.next = plugin_list };
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
144
new_plugin->argv[0] = copy_name;
97
145
new_plugin->argv[1] = NULL;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
150
if(new_plugin->environ == NULL){
152
free(new_plugin->argv);
156
new_plugin->environ[0] = NULL;
101
158
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
159
plugin_list = new_plugin;
103
160
return new_plugin;
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
114
p->argv[p->argc] = NULL;
163
/* Helper function for add_argument and add_environment */
164
static bool add_to_char_array(const char *new, char ***array,
166
/* Resize the pointed-to array to hold one more pointer */
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
175
/* Make a copy of the new string */
179
} while(copy == NULL and errno == EINTR);
183
/* Insert the copy */
184
(*array)[*len] = copy;
186
/* Add a new terminating NULL pointer to the last element */
187
(*array)[*len] = NULL;
191
/* Add to a plugin's argument vector */
192
static bool add_argument(plugin *p, const char *arg){
196
return add_to_char_array(arg, &(p->argv), &(p->argc));
199
/* Add to a plugin's environment */
200
static bool add_environment(plugin *p, const char *def, bool replace){
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
224
return add_to_char_array(def, &(p->environ), &(p->envc));
118
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
119
229
* Descriptor Flags".
120
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
122
static int set_cloexec_flag(int fd)
124
int ret = fcntl(fd, F_GETFD, 0);
232
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
125
234
/* If reading the flags failed, return error indication now. */
129
238
/* Store modified flag word in the descriptor. */
130
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
136
process *process_list = NULL;
138
/* Mark a process as completed when it exits, and save its exit
243
/* Mark processes as completed when they exit, and save their exit
140
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
148
/* Process not found in process list */
151
proc->status = status;
152
proc->completed = true;
245
static void handle_sigchld(__attribute__((unused)) int sig){
246
int old_errno = errno;
248
plugin *proc = plugin_list;
250
pid_t pid = waitpid(-1, &status, WNOHANG);
252
/* Only still running child processes */
257
/* No child processes */
263
/* A child exited, find it in process_list */
264
while(proc != NULL and proc->pid != pid){
268
/* Process not found in process list */
271
proc->status = status;
277
/* Prints out a password to stdout */
278
static bool print_out_password(const char *buffer, size_t length){
280
for(size_t written = 0; written < length; written += (size_t)ret){
281
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
290
/* Removes and free a plugin from the plugin list */
291
static void free_plugin(plugin *plugin_node){
293
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
296
free(plugin_node->argv);
297
for(char **env = plugin_node->environ; *env != NULL; env++){
300
free(plugin_node->environ);
301
free(plugin_node->buffer);
303
/* Removes the plugin from the singly-linked list */
304
if(plugin_node == plugin_list){
305
/* First one - simple */
306
plugin_list = plugin_list->next;
308
/* Second one or later */
309
for(plugin *p = plugin_list; p != NULL; p = p->next){
310
if(p->next == plugin_node){
311
p->next = plugin_node->next;
320
static void free_plugin_list(void){
321
while(plugin_list != NULL){
322
free_plugin(plugin_list);
155
326
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
327
char *plugindir = NULL;
328
char *argfile = NULL;
157
330
size_t d_name_len;
159
332
struct dirent *dirst;
162
335
int ret, maxfd = 0;
163
337
uid_t uid = 65534;
164
338
gid_t gid = 65534;
165
339
bool debug = false;
188
364
{ .name = "global-options", .key = 'g',
189
365
.arg = "OPTION[,OPTION[,...]]",
190
366
.doc = "Options passed to all plugins" },
367
{ .name = "global-env", .key = 'G',
369
.doc = "Environment variable passed to all plugins" },
191
370
{ .name = "options-for", .key = 'o',
192
371
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
372
.doc = "Options passed only to specified plugin" },
373
{ .name = "env-for", .key = 'E',
374
.arg = "PLUGIN:ENV=value",
375
.doc = "Environment variable passed to specified plugin" },
194
376
{ .name = "disable", .key = 'd',
196
378
.doc = "Disable a specific plugin", .group = 1 },
379
{ .name = "enable", .key = 'e',
381
.doc = "Enable a specific plugin", .group = 1 },
197
382
{ .name = "plugin-dir", .key = 128,
198
383
.arg = "DIRECTORY",
199
384
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
385
{ .name = "config-file", .key = 129,
387
.doc = "Specify a different configuration file", .group = 2 },
388
{ .name = "userid", .key = 130,
389
.arg = "ID", .flags = 0,
390
.doc = "User ID the plugins will run as", .group = 3 },
391
{ .name = "groupid", .key = 131,
392
.arg = "ID", .flags = 0,
393
.doc = "Group ID the plugins will run as", .group = 3 },
394
{ .name = "debug", .key = 132,
395
.doc = "Debug mode", .group = 4 },
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
218
char *p = strtok(arg, ",");
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
240
getplugin(arg, plugins)->disabled = true;
247
uid = (uid_t)strtol(arg, NULL, 10);
250
gid = (gid_t)strtol(arg, NULL, 10);
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
404
case 'g': /* --global-options */
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
411
if(not add_argument(getplugin(NULL), plugin_option)){
412
perror("add_argument");
413
return ARGP_ERR_UNKNOWN;
418
case 'G': /* --global-env */
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
426
case 'o': /* --options-for */
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
441
case 'E': /* --env-for */
446
char *envdef = strchr(arg, ':');
451
if(not add_environment(getplugin(arg), envdef+1, true)){
452
perror("add_environment");
456
case 'd': /* --disable */
458
plugin *p = getplugin(arg);
460
return ARGP_ERR_UNKNOWN;
465
case 'e': /* --enable */
467
plugin *p = getplugin(arg);
469
return ARGP_ERR_UNKNOWN;
474
case 128: /* --plugin-dir */
476
plugindir = strdup(arg);
477
if(plugindir == NULL){
481
case 129: /* --config-file */
482
/* This is already done by parse_opt_config_file() */
484
case 130: /* --userid */
486
tmpmax = strtoimax(arg, &tmp, 10);
487
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
495
case 131: /* --groupid */
497
tmpmax = strtoimax(arg, &tmp, 10);
498
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
506
case 132: /* --debug */
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
264
return ARGP_ERR_UNKNOWN;
269
plugin *plugin_list = NULL;
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
510
* When adding more options before this line, remember to also add a
511
* "case" to the "parse_opt_config_file" function below.
514
/* Cryptsetup always passes an argument, which is an empty
515
string if "none" was specified in /etc/crypttab. So if
516
argument was empty, we ignore it silently. */
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
524
return ARGP_ERR_UNKNOWN;
529
/* This option parser is the same as parse_opt() above, except it
530
ignores everything but the --config-file option. */
531
error_t parse_opt_config_file(int key, char *arg,
532
__attribute__((unused))
533
struct argp_state *state){
535
case 'g': /* --global-options */
536
case 'G': /* --global-env */
537
case 'o': /* --options-for */
538
case 'E': /* --env-for */
539
case 'd': /* --disable */
540
case 'e': /* --enable */
541
case 128: /* --plugin-dir */
543
case 129: /* --config-file */
545
argfile = strdup(arg);
550
case 130: /* --userid */
551
case 131: /* --groupid */
552
case 132: /* --debug */
557
return ARGP_ERR_UNKNOWN;
562
struct argp argp = { .options = options,
563
.parser = parse_opt_config_file,
273
565
.doc = "Mandos plugin runner -- Run plugins" };
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
567
/* Parse using parse_opt_config_file() in order to get the custom
568
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
571
fprintf(stderr, "Unknown error while parsing arguments\n");
572
exitstatus = EXIT_FAILURE;
576
/* Reset to the normal argument parser */
577
argp.parser = parse_opt;
579
/* Open the configfile if available */
581
conffp = fopen(AFILE, "r");
583
conffp = fopen(argfile, "r");
586
char *org_line = NULL;
587
char *p, *arg, *new_arg, *line;
589
const char whitespace_delims[] = " \r\t\f\v\n";
590
const char comment_delim[] = "#";
593
custom_argv = malloc(sizeof(char*) * 2);
594
if(custom_argv == NULL){
287
595
perror("malloc");
288
596
exitstatus = EXIT_FAILURE;
291
plus_argv[0] = argv[0];
293
arg = strtok(plus_options, delims); /* Get first argument */
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
300
exitstatus = EXIT_FAILURE;
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
599
custom_argv[0] = argv[0];
600
custom_argv[1] = NULL;
602
/* for each line in the config file, strip whitespace and ignore
605
sret = getline(&org_line, &size, conffp);
611
arg = strsep(&line, comment_delim);
612
while((p = strsep(&arg, whitespace_delims)) != NULL){
619
exitstatus = EXIT_FAILURE;
625
custom_argv = realloc(custom_argv, sizeof(char *)
626
* ((unsigned int) custom_argc + 1));
627
if(custom_argv == NULL){
629
exitstatus = EXIT_FAILURE;
633
custom_argv[custom_argc-1] = new_arg;
634
custom_argv[custom_argc] = NULL;
638
ret = fclose(conffp);
639
} while(ret == EOF and errno == EINTR);
642
exitstatus = EXIT_FAILURE;
647
/* Check for harmful errors and go to fallback. Other errors might
648
not affect opening plugins */
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
exitstatus = EXIT_FAILURE;
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
657
if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
if(ret == ARGP_ERR_UNKNOWN){
661
fprintf(stderr, "Unknown error while parsing arguments\n");
662
exitstatus = EXIT_FAILURE;
667
/* Parse actual command line arguments, to let them override the
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
475
905
perror("sigaction");
476
906
_exit(EXIT_FAILURE);
478
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
480
910
perror("sigprocmask");
481
911
_exit(EXIT_FAILURE);
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
914
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
485
920
if(dirfd(dir) < 0){
486
921
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
922
above and must now close it manually here. */
490
if(execv(filename, p->argv) < 0){
925
if(p->environ[0] == NULL){
926
if(execv(filename, p->argv) < 0){
931
if(execve(filename, p->argv, p->environ) < 0){
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
502
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
942
plugin *new_plugin = getplugin(dirst->d_name);
943
if(new_plugin == NULL){
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
504
perror("sigprocmask");
949
perror("sigprocmask");
506
951
exitstatus = EXIT_FAILURE;
510
*new_process = (struct process){ .pid = pid,
512
.next = process_list };
514
process_list = new_process;
955
new_plugin->pid = pid;
956
new_plugin->fd = pipefd[0];
515
958
/* Unblock SIGCHLD so signal handler can be run if this process
516
959
has already completed */
517
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
519
964
perror("sigprocmask");
520
965
exitstatus = EXIT_FAILURE;
524
FD_SET(new_process->fd, &rfds_all);
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
969
FD_SET(new_plugin->fd, &rfds_all);
971
if(maxfd < new_plugin->fd){
972
maxfd = new_plugin->fd;
976
TEMP_FAILURE_RETRY(closedir(dir));
978
free_plugin(getplugin(NULL));
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
980
for(plugin *p = plugin_list; p != NULL; p = p->next){
985
fprintf(stderr, "No plugin processes started. Incorrect plugin"
991
/* Main loop while running plugins exist */
548
993
fd_set rfds = rfds_all;
549
994
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
if (select_ret == -1){
995
if(select_ret == -1 and errno != EINTR){
551
996
perror("select");
552
997
exitstatus = EXIT_FAILURE;
555
1000
/* OK, now either a process completed, or something can be read
556
1001
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
1002
for(plugin *proc = plugin_list; proc != NULL;){
558
1003
/* Is this process completely done? */
559
if(proc->eof and proc->completed){
1004
if(proc->completed and proc->eof){
560
1005
/* Only accept the plugin output if it exited cleanly */
561
1006
if(not WIFEXITED(proc->status)
562
1007
or WEXITSTATUS(proc->status) != 0){
563
1008
/* Bad exit by plugin */
565
1011
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
568
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
1015
WEXITSTATUS(proc->status));
1016
} else if(WIFSIGNALED(proc->status)){
1017
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1018
" signal %d: %s\n", proc->name,
1019
(intmax_t) (proc->pid),
1020
WTERMSIG(proc->status),
1021
strsignal(WTERMSIG(proc->status)));
571
1022
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
575
1028
/* Remove the plugin */
576
1029
FD_CLR(proc->fd, &rfds_all);
577
1031
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
580
1036
perror("sigprocmask");
581
1037
exitstatus = EXIT_FAILURE;
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
592
p->next = proc->next;
1041
plugin *next_plugin = proc->next;
597
1045
/* We are done modifying process list, so unblock signal */
598
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
601
1050
perror("sigprocmask");
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
1051
exitstatus = EXIT_FAILURE;
1055
if(plugin_list == NULL){
610
1062
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
619
exitstatus = EXIT_FAILURE;
1064
bool bret = print_out_password(proc->buffer,
1065
proc->buffer_length);
1067
perror("print_out_password");
1068
exitstatus = EXIT_FAILURE;
625
1073
/* This process has not completed. Does it have any output? */
626
1074
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
1075
/* This process had nothing to say at this time */
630
1079
/* Before reading, make the process' data buffer large enough */
631
1080
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
632
1081
proc->buffer = realloc(proc->buffer, proc->buffer_size
633
1082
+ (size_t) BUFFER_SIZE);
634
if (proc->buffer == NULL){
1083
if(proc->buffer == NULL){
635
1084
perror("malloc");
636
1085
exitstatus = EXIT_FAILURE;
639
1088
proc->buffer_size += BUFFER_SIZE;
641
1090
/* Read from the process */
642
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1093
+ proc->buffer_length,
645
1096
/* Read error from this process; ignore the error */
650
1102
proc->eof = true;
652
proc->buffer_length += (size_t) ret;
1104
proc->buffer_length += (size_t) sret;
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1113
/* Fallback if all plugins failed, none are found or an error
1116
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1117
char *passwordbuffer = getpass("Password: ");
1118
size_t len = strlen(passwordbuffer);
1119
/* Strip trailing newline */
1120
if(len > 0 and passwordbuffer[len-1] == '\n'){
1121
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1124
bret = print_out_password(passwordbuffer, len);
1126
perror("print_out_password");
1127
exitstatus = EXIT_FAILURE;
662
1131
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
1132
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1134
perror("sigaction");
1135
exitstatus = EXIT_FAILURE;
1138
if(custom_argv != NULL){
1139
for(char **arg = custom_argv+1; *arg != NULL; arg++){
674
1145
if(dir != NULL){
678
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
1149
/* Kill the processes */
1150
for(plugin *p = plugin_list; p != NULL; p = p->next){
1153
ret = kill(p->pid, SIGTERM);
1154
if(ret == -1 and errno != ESRCH){
1155
/* Set-uid proccesses might not get closed */
687
1161
/* Wait for any remaining child processes to terminate */
689
1163
ret = wait(NULL);
690
1164
} while(ret >= 0);
691
1165
if(errno != ECHILD){
695
1174
return exitstatus;