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(),
41
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
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() */
45
31
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
readdir(), closedir(), dirfd() */
32
readdir(), closedir() */
33
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
47
34
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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(),
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(),
58
45
#include <errno.h> /* errno */
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() */
72
#define BUFFER_SIZE 256
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>";
46
#include <argp.h> /* struct argp_option,
47
struct argp_state, struct argp,
52
typedef struct process{
80
61
typedef struct plugin{
81
62
char *name; /* can be NULL or any plugin name */
88
/* Variables used for running processes*/
95
volatile sig_atomic_t completed;
97
66
struct plugin *next;
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))){
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))){
112
76
/* Create a new plugin */
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;
77
plugin *new_plugin = malloc(sizeof(plugin));
78
if (new_plugin == NULL){
82
new_plugin->name = name;
83
new_plugin->argv = malloc(sizeof(char *) * 2);
84
if (new_plugin->argv == NULL){
88
new_plugin->argv[0] = name;
145
89
new_plugin->argv[1] = NULL;
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;
91
new_plugin->disabled = false;
92
new_plugin->next = *plugin_list;
158
93
/* Append the new plugin to the list */
159
plugin_list = new_plugin;
94
*plugin_list = new_plugin;
160
95
return new_plugin;
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));
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
234
/* If reading the flags failed, return error indication now. */
238
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
244
/* Mark processes as completed when they exit, and save their exit
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
249
plugin *proc = plugin_list;
251
pid_t pid = waitpid(-1, &status, WNOHANG);
253
/* Only still running child processes */
258
/* No child processes */
264
/* A child exited, find it in process_list */
265
while(proc != NULL and proc->pid != pid){
269
/* Process not found in process list */
272
proc->status = status;
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
281
for(size_t written = 0; written < length; written += (size_t)ret){
282
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
/* Removes and free a plugin from the plugin list */
292
static void free_plugin(plugin *plugin_node){
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
297
free(plugin_node->argv);
298
for(char **env = plugin_node->environ; *env != NULL; env++){
301
free(plugin_node->environ);
302
free(plugin_node->buffer);
304
/* Removes the plugin from the singly-linked list */
305
if(plugin_node == plugin_list){
306
/* First one - simple */
307
plugin_list = plugin_list->next;
309
/* Second one or later */
310
for(plugin *p = plugin_list; p != NULL; p = p->next){
311
if(p->next == plugin_node){
312
p->next = plugin_node->next;
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
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;
109
#define BUFFER_SIZE 256
111
const char *argp_program_version =
112
"plugbasedclient 0.9";
113
const char *argp_program_bug_address =
114
"<mandos@fukt.bsnet.se>";
327
116
int main(int argc, char *argv[]){
328
char *plugindir = NULL;
329
char *argfile = NULL;
117
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
331
118
size_t d_name_len;
333
120
struct dirent *dirst;
336
123
int ret, maxfd = 0;
124
process *process_list = NULL;
340
125
bool debug = false;
341
126
int exitstatus = EXIT_SUCCESS;
342
struct sigaction old_sigchld_action;
343
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
344
.sa_flags = SA_NOCLDSTOP };
345
char **custom_argv = NULL;
348
/* Establish a signal handler */
349
sigemptyset(&sigchld_action.sa_mask);
350
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
353
exitstatus = EXIT_FAILURE;
356
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
359
exitstatus = EXIT_FAILURE;
363
128
/* The options we understand. */
364
129
struct argp_option options[] = {
365
130
{ .name = "global-options", .key = 'g',
366
131
.arg = "OPTION[,OPTION[,...]]",
367
132
.doc = "Options passed to all plugins" },
368
{ .name = "global-env", .key = 'G',
370
.doc = "Environment variable passed to all plugins" },
371
133
{ .name = "options-for", .key = 'o',
372
134
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
373
135
.doc = "Options passed only to specified plugin" },
374
{ .name = "env-for", .key = 'E',
375
.arg = "PLUGIN:ENV=value",
376
.doc = "Environment variable passed to specified plugin" },
377
136
{ .name = "disable", .key = 'd',
379
138
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
382
.doc = "Enable a specific plugin", .group = 1 },
383
139
{ .name = "plugin-dir", .key = 128,
384
140
.arg = "DIRECTORY",
385
141
.doc = "Specify a different plugin directory", .group = 2 },
386
{ .name = "config-file", .key = 129,
388
.doc = "Specify a different configuration file", .group = 2 },
389
{ .name = "userid", .key = 130,
390
.arg = "ID", .flags = 0,
391
.doc = "User ID the plugins will run as", .group = 3 },
392
{ .name = "groupid", .key = 131,
393
.arg = "ID", .flags = 0,
394
.doc = "Group ID the plugins will run as", .group = 3 },
395
{ .name = "debug", .key = 132,
396
.doc = "Debug mode", .group = 4 },
142
{ .name = "debug", .key = 129,
143
.doc = "Debug mode", .group = 3 },
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
405
case 'g': /* --global-options */
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
412
if(not add_argument(getplugin(NULL), plugin_option)){
413
perror("add_argument");
414
return ARGP_ERR_UNKNOWN;
419
case 'G': /* --global-env */
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
427
case 'o': /* --options-for */
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
442
case 'E': /* --env-for */
447
char *envdef = strchr(arg, ':');
452
if(not add_environment(getplugin(arg), envdef+1, true)){
453
perror("add_environment");
457
case 'd': /* --disable */
459
plugin *p = getplugin(arg);
461
return ARGP_ERR_UNKNOWN;
466
case 'e': /* --enable */
468
plugin *p = getplugin(arg);
470
return ARGP_ERR_UNKNOWN;
475
case 128: /* --plugin-dir */
477
plugindir = strdup(arg);
478
if(plugindir == NULL){
482
case 129: /* --config-file */
483
/* This is already done by parse_opt_config_file() */
485
case 130: /* --userid */
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
496
case 131: /* --groupid */
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
507
case 132: /* --debug */
147
error_t parse_opt (int key, char *arg, struct argp_state *state) {
148
/* Get the INPUT argument from `argp_parse', which we
149
know is a pointer to our plugin list pointer. */
150
plugin **plugins = state->input;
154
char *p = strtok(arg, ",");
156
addargument(getplugin(NULL, plugins), p);
157
p = strtok(NULL, ",");
163
char *name = strtok(arg, ":");
164
char *p = strtok(NULL, ":");
168
addargument(getplugin(name, plugins), p);
169
p = strtok(NULL, ",");
176
getplugin(arg, plugins)->disabled = true;
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
525
return ARGP_ERR_UNKNOWN;
530
/* This option parser is the same as parse_opt() above, except it
531
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
536
case 'g': /* --global-options */
537
case 'G': /* --global-env */
538
case 'o': /* --options-for */
539
case 'E': /* --env-for */
540
case 'd': /* --disable */
541
case 'e': /* --enable */
542
case 128: /* --plugin-dir */
544
case 129: /* --config-file */
546
argfile = strdup(arg);
551
case 130: /* --userid */
552
case 131: /* --groupid */
553
case 132: /* --debug */
558
return ARGP_ERR_UNKNOWN;
563
struct argp argp = { .options = options,
564
.parser = parse_opt_config_file,
191
return ARGP_ERR_UNKNOWN;
196
plugin *plugin_list = NULL;
198
struct argp argp = { .options = options, .parser = parse_opt,
566
200
.doc = "Mandos plugin runner -- Run plugins" };
568
/* Parse using parse_opt_config_file() in order to get the custom
569
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
577
/* Reset to the normal argument parser */
578
argp.parser = parse_opt;
580
/* Open the configfile if available */
582
conffp = fopen(AFILE, "r");
584
conffp = fopen(argfile, "r");
587
char *org_line = NULL;
588
char *p, *arg, *new_arg, *line;
590
const char whitespace_delims[] = " \r\t\f\v\n";
591
const char comment_delim[] = "#";
594
custom_argv = malloc(sizeof(char*) * 2);
595
if(custom_argv == NULL){
597
exitstatus = EXIT_FAILURE;
600
custom_argv[0] = argv[0];
601
custom_argv[1] = NULL;
603
/* for each line in the config file, strip whitespace and ignore
606
sret = getline(&org_line, &size, conffp);
612
arg = strsep(&line, comment_delim);
613
while((p = strsep(&arg, whitespace_delims)) != NULL){
620
exitstatus = EXIT_FAILURE;
626
custom_argv = realloc(custom_argv, sizeof(char *)
627
* ((unsigned int) custom_argc + 1));
628
if(custom_argv == NULL){
630
exitstatus = EXIT_FAILURE;
634
custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
643
exitstatus = EXIT_FAILURE;
648
/* Check for harmful errors and go to fallback. Other errors might
649
not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
652
exitstatus = EXIT_FAILURE;
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
658
if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
661
if(ret == ARGP_ERR_UNKNOWN){
662
fprintf(stderr, "Unknown error while parsing arguments\n");
663
exitstatus = EXIT_FAILURE;
668
/* Parse actual command line arguments, to let them override the
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
202
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
678
205
for(plugin *p = plugin_list; p != NULL; p=p->next){
679
206
fprintf(stderr, "Plugin: %s has %d arguments\n",
680
p->name ? p->name : "Global", p->argc - 1);
207
p->name ? p->name : "Global", p->argc);
681
208
for(char **a = p->argv; *a != NULL; a++){
682
209
fprintf(stderr, "\tArg: %s\n", *a);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
685
for(char **a = p->environ; *a != NULL; a++){
686
fprintf(stderr, "\t%s\n", *a);
691
/* Strip permissions down to nobody */
701
if(plugindir == NULL){
704
dir = opendir(plugindir);
214
dir = opendir(plugindir);
216
/* Set the FD_CLOEXEC flag on the directory */
218
ret = fcntl (fd, F_GETFD, 0);
220
perror("fcntl F_GETFD");
223
ret = fcntl(fd, F_SETFD, FD_CLOEXEC | ret);
225
perror("fcntl F_SETFD");
708
perror("Could not open plugin dir");
709
exitstatus = EXIT_FAILURE;
713
/* Set the FD_CLOEXEC flag on the directory, if possible */
715
int dir_fd = dirfd(dir);
717
ret = set_cloexec_flag(dir_fd);
719
perror("set_cloexec_flag");
720
exitstatus = EXIT_FAILURE;
231
fprintf(stderr, "Can not open directory\n");
726
235
FD_ZERO(&rfds_all);
728
/* Read and execute any executable in the plugin directory*/
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
238
dirst = readdir(dir);
734
/* All directory entries have been processed */
240
// All directory entries have been processed
735
241
if(dirst == NULL){
738
exitstatus = EXIT_FAILURE;
744
245
d_name_len = strlen(dirst->d_name);
746
/* Ignore dotfiles, backup files and other junk */
247
// Ignore dotfiles, backup files and other junk
748
249
bool bad_name = false;
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
292
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
293
if (filename == NULL){
295
exitstatus =EXIT_FAILURE;
298
strcpy(filename, plugindir);
299
strcat(filename, "/");
300
strcat(filename, dirst->d_name);
304
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
306
fprintf(stderr, "Ignoring plugin dir entry name \"%s\""
816
307
" with bad type or mode\n", filename);
822
plugin *p = getplugin(dirst->d_name);
311
if(getplugin(dirst->d_name, &plugin_list)->disabled){
830
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
313
fprintf(stderr, "Ignoring disabled plugin \"%s\"",
837
/* Add global arguments to argument list for this plugin */
838
plugin *g = getplugin(NULL);
840
for(char **a = g->argv + 1; *a != NULL; a++){
841
if(not add_argument(p, *a)){
842
perror("add_argument");
845
/* Add global environment variables */
846
for(char **e = g->environ; *e != NULL; e++){
847
if(not add_environment(p, *e, false)){
848
perror("add_environment");
853
/* If this plugin has any environment variables, we will call
854
using execve and need to duplicate the environment from this
856
if(p->environ[0] != NULL){
857
for(char **e = environ; *e != NULL; e++){
858
if(not add_environment(p, *e, false)){
859
perror("add_environment");
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
868
exitstatus = EXIT_FAILURE;
871
/* Ask OS to automatic close the pipe on exec */
872
ret = set_cloexec_flag(pipefd[0]);
874
perror("set_cloexec_flag");
875
exitstatus = EXIT_FAILURE;
878
ret = set_cloexec_flag(pipefd[1]);
880
perror("set_cloexec_flag");
881
exitstatus = EXIT_FAILURE;
884
/* Block SIGCHLD until process is safely in process list */
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
889
perror("sigprocmask");
890
exitstatus = EXIT_FAILURE;
893
/* Starting a new process to be watched */
897
} while(pid == -1 and errno == EINTR);
900
exitstatus = EXIT_FAILURE;
318
// Starting a new process to be watched
904
327
/* this is the child process */
905
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
912
perror("sigprocmask");
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
923
/* If dir has no file descriptor, we could not set FD_CLOEXEC
924
above and must now close it manually here. */
927
if(p->environ[0] == NULL){
928
if(execv(filename, p->argv) < 0){
933
if(execve(filename, p->argv, p->environ) < 0){
329
close(pipefd[0]); /* close unused read end of pipe */
330
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
332
plugin *p = getplugin(dirst->d_name, &plugin_list);
333
plugin *g = getplugin(NULL, &plugin_list);
334
for(char **a = g->argv + 1; *a != NULL; a++){
337
if(execv(filename, p->argv) < 0){
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
944
plugin *new_plugin = getplugin(dirst->d_name);
945
if(new_plugin == NULL){
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
951
perror("sigprocmask");
953
exitstatus = EXIT_FAILURE;
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
960
/* Unblock SIGCHLD so signal handler can be run if this process
961
has already completed */
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
966
perror("sigprocmask");
967
exitstatus = EXIT_FAILURE;
971
FD_SET(new_plugin->fd, &rfds_all);
973
if(maxfd < new_plugin->fd){
974
maxfd = new_plugin->fd;
978
TEMP_FAILURE_RETRY(closedir(dir));
980
free_plugin(getplugin(NULL));
982
for(plugin *p = plugin_list; p != NULL; p = p->next){
344
close(pipefd[1]); /* close unused write end of pipe */
345
process *new_process = malloc(sizeof(process));
346
if (new_process == NULL){
348
exitstatus = EXIT_FAILURE;
352
new_process->fd = pipefd[0];
353
new_process->buffer = malloc(BUFFER_SIZE);
354
if (new_process->buffer == NULL){
356
exitstatus = EXIT_FAILURE;
359
new_process->buffer_size = BUFFER_SIZE;
360
new_process->buffer_length = 0;
361
FD_SET(new_process->fd, &rfds_all);
363
if (maxfd < new_process->fd){
364
maxfd = new_process->fd;
368
new_process->next = process_list;
369
process_list = new_process;
374
if (process_list != NULL){
376
fd_set rfds = rfds_all;
377
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
378
if (select_ret == -1){
382
for(process *process_itr = process_list; process_itr != NULL;
383
process_itr = process_itr->next){
384
if(FD_ISSET(process_itr->fd, &rfds)){
385
if(process_itr->buffer_length + BUFFER_SIZE
386
> process_itr->buffer_size){
387
process_itr->buffer = realloc(process_itr->buffer,
388
process_itr->buffer_size
389
+ (size_t) BUFFER_SIZE);
390
if (process_itr->buffer == NULL){
394
process_itr->buffer_size += BUFFER_SIZE;
396
ret = read(process_itr->fd, process_itr->buffer
397
+ process_itr->buffer_length, BUFFER_SIZE);
399
/* Read error from this process; ignore it */
402
process_itr->buffer_length += (size_t) ret;
405
/* wait for process exit */
407
waitpid(process_itr->pid, &status, 0);
408
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
409
for(size_t written = 0;
410
written < process_itr->buffer_length;){
411
ret = write(STDOUT_FILENO,
412
process_itr->buffer + written,
413
process_itr->buffer_length - written);
418
written += (size_t)ret;
422
FD_CLR(process_itr->fd, &rfds_all);
432
for(process *process_itr = process_list; process_itr != NULL;
433
process_itr = process_itr->next){
434
close(process_itr->fd);
435
kill(process_itr->pid, SIGTERM);
436
free(process_itr->buffer);
987
fprintf(stderr, "No plugin processes started. Incorrect plugin"
993
/* Main loop while running plugins exist */
995
fd_set rfds = rfds_all;
996
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
997
if(select_ret == -1 and errno != EINTR){
999
exitstatus = EXIT_FAILURE;
1002
/* OK, now either a process completed, or something can be read
1004
for(plugin *proc = plugin_list; proc != NULL;){
1005
/* Is this process completely done? */
1006
if(proc->completed and proc->eof){
1007
/* Only accept the plugin output if it exited cleanly */
1008
if(not WIFEXITED(proc->status)
1009
or WEXITSTATUS(proc->status) != 0){
1010
/* Bad exit by plugin */
1013
if(WIFEXITED(proc->status)){
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
1017
WEXITSTATUS(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
1024
} else if(WCOREDUMP(proc->status)){
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
1030
/* Remove the plugin */
1031
FD_CLR(proc->fd, &rfds_all);
1033
/* Block signal while modifying process_list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1036
&sigchld_action.sa_mask,
1039
perror("sigprocmask");
1040
exitstatus = EXIT_FAILURE;
1044
plugin *next_plugin = proc->next;
1048
/* We are done modifying process list, so unblock signal */
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
1053
perror("sigprocmask");
1054
exitstatus = EXIT_FAILURE;
1058
if(plugin_list == NULL){
1065
/* This process exited nicely, so print its buffer */
1067
bool bret = print_out_password(proc->buffer,
1068
proc->buffer_length);
1070
perror("print_out_password");
1071
exitstatus = EXIT_FAILURE;
1076
/* This process has not completed. Does it have any output? */
1077
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1078
/* This process had nothing to say at this time */
1082
/* Before reading, make the process' data buffer large enough */
1083
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1084
proc->buffer = realloc(proc->buffer, proc->buffer_size
1085
+ (size_t) BUFFER_SIZE);
1086
if(proc->buffer == NULL){
1088
exitstatus = EXIT_FAILURE;
1091
proc->buffer_size += BUFFER_SIZE;
1093
/* Read from the process */
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1096
+ proc->buffer_length,
1099
/* Read error from this process; ignore the error */
1107
proc->buffer_length += (size_t) sret;
1115
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1116
/* Fallback if all plugins failed, none are found or an error
1119
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1120
char *passwordbuffer = getpass("Password: ");
1121
size_t len = strlen(passwordbuffer);
1122
/* Strip trailing newline */
1123
if(len > 0 and passwordbuffer[len-1] == '\n'){
1124
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1127
bret = print_out_password(passwordbuffer, len);
1129
perror("print_out_password");
1130
exitstatus = EXIT_FAILURE;
1134
/* Restore old signal handler */
1135
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1137
perror("sigaction");
1138
exitstatus = EXIT_FAILURE;
1141
if(custom_argv != NULL){
1142
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1152
/* Kill the processes */
1153
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
ret = kill(p->pid, SIGTERM);
1157
if(ret == -1 and errno != ESRCH){
1158
/* Set-uid proccesses might not get closed */
1164
/* Wait for any remaining child processes to terminate */
1168
if(errno != ECHILD){
1177
449
return exitstatus;