19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
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(),
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() */
43
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#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() */
56
#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(), sig_atomic_t
67
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
70
#define BUFFER_SIZE 256
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
75
const char *argp_program_version = "plugin-runner " VERSION;
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
78
typedef struct plugin{
79
char *name; /* can be NULL or any plugin name */
86
/* Variables used for running processes*/
25
#define _FORTIFY_SOURCE 2
27
#include <stdio.h> /* popen, fileno */
28
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
30
WIFEXITED, WEXITSTATUS, wait */
31
#include <sys/wait.h> /* wait */
32
#include <dirent.h> /* DIR, opendir */
33
#include <sys/stat.h> /* stat, struct stat */
34
#include <unistd.h> /* stat, struct stat, chdir */
35
#include <stdlib.h> /* EXIT_FAILURE */
36
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
38
#include <string.h> /* strlen, strcpy, strcat */
39
#include <stdbool.h> /* true */
40
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
41
#include <errno.h> /* errno */
45
typedef struct process{
90
49
size_t buffer_size;
91
50
size_t buffer_length;
93
volatile sig_atomic_t completed;
98
static plugin *plugin_list = NULL;
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
106
or (p->name and name and (strcmp(p->name, name) == 0))){
110
/* Create a new plugin */
111
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
115
char *copy_name = NULL;
117
copy_name = strdup(name);
118
if(copy_name == NULL){
124
*new_plugin = (plugin){ .name = copy_name,
127
.next = plugin_list };
129
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
135
new_plugin->argv[0] = copy_name;
136
new_plugin->argv[1] = NULL;
138
new_plugin->environ = malloc(sizeof(char *));
139
if(new_plugin->environ == NULL){
141
free(new_plugin->argv);
145
new_plugin->environ[0] = NULL;
147
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
152
/* Helper function for add_argument and add_environment */
153
static bool add_to_char_array(const char *new, char ***array,
155
/* Resize the pointed-to array to hold one more pointer */
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
162
/* Make a copy of the new string */
163
char *copy = strdup(new);
167
/* Insert the copy */
168
(*array)[*len] = copy;
170
/* Add a new terminating NULL pointer to the last element */
171
(*array)[*len] = NULL;
175
/* Add to a plugin's argument vector */
176
static bool add_argument(plugin *p, const char *arg){
180
return add_to_char_array(arg, &(p->argv), &(p->argc));
183
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
195
char *new = realloc(*e, strlen(def) + 1);
205
return add_to_char_array(def, &(p->environ), &(p->envc));
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
213
static int set_cloexec_flag(int fd){
214
int ret = fcntl(fd, F_GETFD, 0);
215
/* If reading the flags failed, return error indication now. */
219
/* Store modified flag word in the descriptor. */
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
224
/* Mark processes as completed when they exit, and save their exit
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
229
plugin *proc = plugin_list;
231
pid_t pid = waitpid(-1, &status, WNOHANG);
233
/* Only still running child processes */
238
/* No child processes */
244
/* A child exited, find it in process_list */
245
while(proc != NULL and proc->pid != pid){
249
/* Process not found in process list */
252
proc->status = status;
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
54
#define BUFFER_SIZE 256
307
56
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
57
char plugindir[] = "plugins.d";
58
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
313
60
struct dirent *dirst;
316
int ret, numchars, maxfd = 0;
322
int exitstatus = EXIT_SUCCESS;
323
struct sigaction old_sigchld_action;
324
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
325
.sa_flags = SA_NOCLDSTOP };
326
char **custom_argv = NULL;
329
/* Establish a signal handler */
330
sigemptyset(&sigchld_action.sa_mask);
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
334
exitstatus = EXIT_FAILURE;
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
340
exitstatus = EXIT_FAILURE;
344
/* The options we understand. */
345
struct argp_option options[] = {
346
{ .name = "global-options", .key = 'g',
347
.arg = "OPTION[,OPTION[,...]]",
348
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
351
.doc = "Environment variable passed to all plugins" },
352
{ .name = "options-for", .key = 'o',
353
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
356
.arg = "PLUGIN:ENV=value",
357
.doc = "Environment variable passed to specified plugin" },
358
{ .name = "disable", .key = 'd',
360
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
363
.doc = "Enable a specific plugin", .group = 1 },
364
{ .name = "plugin-dir", .key = 128,
366
.doc = "Specify a different plugin directory", .group = 2 },
367
{ .name = "config-file", .key = 129,
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
384
case 'g': /* --global-options */
387
while((plugin_option = strsep(&arg, ",")) != NULL){
388
if(plugin_option[0] == '\0'){
391
if(not add_argument(getplugin(NULL), plugin_option)){
392
perror("add_argument");
393
return ARGP_ERR_UNKNOWN;
398
case 'G': /* --global-env */
402
if(not add_environment(getplugin(NULL), arg, true)){
403
perror("add_environment");
406
case 'o': /* --options-for */
408
char *plugin_name = strsep(&arg, ":");
409
if(plugin_name[0] == '\0'){
413
while((plugin_option = strsep(&arg, ",")) != NULL){
414
if(not add_argument(getplugin(plugin_name), plugin_option)){
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
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
466
if(ret < 1 or tmpmax != (uid_t)tmpmax
467
or arg[numchars] != '\0'){
468
fprintf(stderr, "Bad user ID number: \"%s\", using %"
469
PRIdMAX "\n", arg, (intmax_t)uid);
474
case 131: /* --groupid */
475
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
476
if(ret < 1 or tmpmax != (gid_t)tmpmax
477
or arg[numchars] != '\0'){
478
fprintf(stderr, "Bad group ID number: \"%s\", using %"
479
PRIdMAX "\n", arg, (intmax_t)gid);
484
case 132: /* --debug */
488
* When adding more options before this line, remember to also add a
489
* "case" to the "parse_opt_config_file" function below.
492
/* Cryptsetup always passes an argument, which is an empty
493
string if "none" was specified in /etc/crypttab. So if
494
argument was empty, we ignore it silently. */
496
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
502
return ARGP_ERR_UNKNOWN;
507
/* This option parser is the same as parse_opt() above, except it
508
ignores everything but the --config-file option. */
509
error_t parse_opt_config_file(int key, char *arg,
510
__attribute__((unused))
511
struct argp_state *state){
513
case 'g': /* --global-options */
514
case 'G': /* --global-env */
515
case 'o': /* --options-for */
516
case 'E': /* --env-for */
517
case 'd': /* --disable */
518
case 'e': /* --enable */
519
case 128: /* --plugin-dir */
521
case 129: /* --config-file */
523
argfile = strdup(arg);
528
case 130: /* --userid */
529
case 131: /* --groupid */
530
case 132: /* --debug */
535
return ARGP_ERR_UNKNOWN;
540
struct argp argp = { .options = options,
541
.parser = parse_opt_config_file,
543
.doc = "Mandos plugin runner -- Run plugins" };
545
/* Parse using parse_opt_config_file() in order to get the custom
546
config file location, if any. */
547
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
548
if(ret == ARGP_ERR_UNKNOWN){
549
fprintf(stderr, "Unknown error while parsing arguments\n");
550
exitstatus = EXIT_FAILURE;
554
/* Reset to the normal argument parser */
555
argp.parser = parse_opt;
557
/* Open the configfile if available */
559
conffp = fopen(AFILE, "r");
561
conffp = fopen(argfile, "r");
564
char *org_line = NULL;
565
char *p, *arg, *new_arg, *line;
567
const char whitespace_delims[] = " \r\t\f\v\n";
568
const char comment_delim[] = "#";
571
custom_argv = malloc(sizeof(char*) * 2);
572
if(custom_argv == NULL){
574
exitstatus = EXIT_FAILURE;
577
custom_argv[0] = argv[0];
578
custom_argv[1] = NULL;
580
/* for each line in the config file, strip whitespace and ignore
583
sret = getline(&org_line, &size, conffp);
589
arg = strsep(&line, comment_delim);
590
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
exitstatus = EXIT_FAILURE;
603
custom_argv = realloc(custom_argv, sizeof(char *)
604
* ((unsigned int) custom_argc + 1));
605
if(custom_argv == NULL){
607
exitstatus = EXIT_FAILURE;
611
custom_argv[custom_argc-1] = new_arg;
612
custom_argv[custom_argc] = NULL;
617
/* Check for harmful errors and go to fallback. Other errors might
618
not affect opening plugins */
619
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
621
exitstatus = EXIT_FAILURE;
625
/* If there was any arguments from configuration file,
626
pass them to parser as command arguments */
627
if(custom_argv != NULL){
628
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
630
if(ret == ARGP_ERR_UNKNOWN){
631
fprintf(stderr, "Unknown error while parsing arguments\n");
632
exitstatus = EXIT_FAILURE;
637
/* Parse actual command line arguments, to let them override the
639
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
640
if(ret == ARGP_ERR_UNKNOWN){
641
fprintf(stderr, "Unknown error while parsing arguments\n");
642
exitstatus = EXIT_FAILURE;
647
for(plugin *p = plugin_list; p != NULL; p=p->next){
648
fprintf(stderr, "Plugin: %s has %d arguments\n",
649
p->name ? p->name : "Global", p->argc - 1);
650
for(char **a = p->argv; *a != NULL; a++){
651
fprintf(stderr, "\tArg: %s\n", *a);
653
fprintf(stderr, "...and %d environment variables\n", p->envc);
654
for(char **a = p->environ; *a != NULL; a++){
655
fprintf(stderr, "\t%s\n", *a);
660
/* Strip permissions down to nobody */
670
if(plugindir == NULL){
673
dir = opendir(plugindir);
64
process *process_list = NULL;
66
dir = opendir(plugindir);
677
perror("Could not open plugin dir");
678
exitstatus = EXIT_FAILURE;
682
/* Set the FD_CLOEXEC flag on the directory, if possible */
684
int dir_fd = dirfd(dir);
686
ret = set_cloexec_flag(dir_fd);
688
perror("set_cloexec_flag");
689
exitstatus = EXIT_FAILURE;
697
/* Read and execute any executable in the plugin directory*/
69
fprintf(stderr, "Can not open directory\n");
699
76
dirst = readdir(dir);
701
/* All directory entries have been processed */
78
// All directory entries have been processed
702
79
if(dirst == NULL){
705
exitstatus = EXIT_FAILURE;
711
83
d_name_len = strlen(dirst->d_name);
713
/* Ignore dotfiles, backup files and other junk */
715
bool bad_name = false;
717
const char const *bad_prefixes[] = { ".", "#", NULL };
719
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
722
".dpkg-divert", NULL };
723
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
724
size_t pre_len = strlen(*pre);
725
if((d_name_len >= pre_len)
726
and strncmp((dirst->d_name), *pre, pre_len) == 0){
728
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
729
" with bad prefix %s\n", dirst->d_name, *pre);
738
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
739
size_t suf_len = strlen(*suf);
740
if((d_name_len >= suf_len)
741
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
744
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
745
" with bad suffix %s\n", dirst->d_name, *suf);
758
if(plugindir == NULL){
759
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
761
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
ret = stat(filename, &st);
775
/* Ignore non-executable files */
776
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
779
" with bad type or mode\n", filename);
785
plugin *p = getplugin(dirst->d_name);
793
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
800
/* Add global arguments to argument list for this plugin */
801
plugin *g = getplugin(NULL);
803
for(char **a = g->argv + 1; *a != NULL; a++){
804
if(not add_argument(p, *a)){
805
perror("add_argument");
808
/* Add global environment variables */
809
for(char **e = g->environ; *e != NULL; e++){
810
if(not add_environment(p, *e, false)){
811
perror("add_environment");
816
/* If this plugin has any environment variables, we will call
817
using execve and need to duplicate the environment from this
819
if(p->environ[0] != NULL){
820
for(char **e = environ; *e != NULL; e++){
821
if(not add_environment(p, *e, false)){
822
perror("add_environment");
831
exitstatus = EXIT_FAILURE;
834
/* Ask OS to automatic close the pipe on exec */
835
ret = set_cloexec_flag(pipefd[0]);
837
perror("set_cloexec_flag");
838
exitstatus = EXIT_FAILURE;
841
ret = set_cloexec_flag(pipefd[1]);
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
847
/* Block SIGCHLD until process is safely in process list */
848
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
850
perror("sigprocmask");
851
exitstatus = EXIT_FAILURE;
854
/* Starting a new process to be watched */
858
exitstatus = EXIT_FAILURE;
862
/* this is the child process */
863
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
868
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
870
perror("sigprocmask");
874
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
/* If dir has no file descriptor, we could not set FD_CLOEXEC
882
above and must now close it manually here. */
85
// Ignore dotfiles and backup files
86
if (dirst->d_name[0] == '.'
87
or dirst->d_name[d_name_len - 1] == '~'){
91
char *filename = malloc(d_name_len + plugindir_len + 2);
92
strcpy(filename, plugindir);
93
strcat(filename, "/");
94
strcat(filename, dirst->d_name);
98
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
99
// Starting a new process to be watched
100
process *new_process = malloc(sizeof(process));
103
new_process->pid = fork();
104
if(new_process->pid == 0){
105
/* this is the child process */
885
if(p->environ[0] == NULL){
886
if(execv(filename, p->argv) < 0){
891
if(execve(filename, p->argv, p->environ) < 0){
899
close(pipefd[1]); /* Close unused write end of pipe */
901
plugin *new_plugin = getplugin(dirst->d_name);
902
if(new_plugin == NULL){
904
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
906
perror("sigprocmask");
908
exitstatus = EXIT_FAILURE;
912
new_plugin->pid = pid;
913
new_plugin->fd = pipefd[0];
915
/* Unblock SIGCHLD so signal handler can be run if this process
916
has already completed */
917
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
919
perror("sigprocmask");
920
exitstatus = EXIT_FAILURE;
924
FD_SET(new_plugin->fd, &rfds_all);
926
if(maxfd < new_plugin->fd){
927
maxfd = new_plugin->fd;
107
close(pipefd[0]); /* close unused read end of pipe */
108
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
109
/* create a new modified argument list */
110
char **new_argv = malloc(sizeof(char *)
111
* ((unsigned int) argc + 1));
112
new_argv[0] = filename;
113
for(int i = 1; i < argc; i++){
114
new_argv[i] = argv[i];
116
new_argv[argc] = NULL;
117
if(execv(filename, new_argv) < 0){
124
close(pipefd[1]); /* close unused write end of pipe */
125
new_process->fd = pipefd[0];
126
new_process->buffer = malloc(BUFFER_SIZE);
127
if (new_process->buffer == NULL){
131
new_process->buffer_size = BUFFER_SIZE;
132
new_process->buffer_length = 0;
133
FD_SET(new_process->fd, &rfds_orig);
135
if (maxfd < new_process->fd){
136
maxfd = new_process->fd;
140
new_process->next = process_list;
141
process_list = new_process;
933
free_plugin(getplugin(NULL));
935
for(plugin *p = plugin_list; p != NULL; p = p->next){
147
if (process_list != NULL){
149
fd_set rfds = rfds_orig;
150
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
151
if (select_ret == -1){
155
for(process *process_itr = process_list; process_itr != NULL;
156
process_itr = process_itr->next){
157
if(FD_ISSET(process_itr->fd, &rfds)){
158
if(process_itr->buffer_length + BUFFER_SIZE
159
> process_itr->buffer_size){
160
process_itr->buffer = realloc(process_itr->buffer,
161
process_itr->buffer_size
162
+ (size_t) BUFFER_SIZE);
163
if (process_itr->buffer == NULL){
167
process_itr->buffer_size += BUFFER_SIZE;
169
ret = read(process_itr->fd, process_itr->buffer
170
+ process_itr->buffer_length, BUFFER_SIZE);
172
/* Read error from this process; ignore it */
175
process_itr->buffer_length += (size_t) ret;
178
/* wait for process exit */
180
waitpid(process_itr->pid, &status, 0);
181
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
182
write(STDOUT_FILENO, process_itr->buffer,
183
process_itr->buffer_length);
186
FD_CLR(process_itr->fd, &rfds_orig);
196
for(process *process_itr = process_list; process_itr != NULL;
197
process_itr = process_itr->next){
198
close(process_itr->fd);
199
kill(process_itr->pid, SIGTERM);
200
free(process_itr->buffer);
940
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
/* Main loop while running plugins exist */
948
fd_set rfds = rfds_all;
949
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
950
if(select_ret == -1){
952
exitstatus = EXIT_FAILURE;
955
/* OK, now either a process completed, or something can be read
957
for(plugin *proc = plugin_list; proc != NULL;){
958
/* Is this process completely done? */
959
if(proc->completed and proc->eof){
960
/* Only accept the plugin output if it exited cleanly */
961
if(not WIFEXITED(proc->status)
962
or WEXITSTATUS(proc->status) != 0){
963
/* Bad exit by plugin */
966
if(WIFEXITED(proc->status)){
967
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
968
" status %d\n", proc->name,
969
(intmax_t) (proc->pid),
970
WEXITSTATUS(proc->status));
971
} else if(WIFSIGNALED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
973
" signal %d\n", proc->name,
974
(intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
978
" core\n", proc->name, (intmax_t) (proc->pid));
982
/* Remove the plugin */
983
FD_CLR(proc->fd, &rfds_all);
985
/* Block signal while modifying process_list */
986
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
perror("sigprocmask");
989
exitstatus = EXIT_FAILURE;
993
plugin *next_plugin = proc->next;
997
/* We are done modifying process list, so unblock signal */
998
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1001
perror("sigprocmask");
1002
exitstatus = EXIT_FAILURE;
1006
if(plugin_list == NULL){
1013
/* This process exited nicely, so print its buffer */
1015
bool bret = print_out_password(proc->buffer,
1016
proc->buffer_length);
1018
perror("print_out_password");
1019
exitstatus = EXIT_FAILURE;
1024
/* This process has not completed. Does it have any output? */
1025
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1026
/* This process had nothing to say at this time */
1030
/* Before reading, make the process' data buffer large enough */
1031
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1032
proc->buffer = realloc(proc->buffer, proc->buffer_size
1033
+ (size_t) BUFFER_SIZE);
1034
if(proc->buffer == NULL){
1036
exitstatus = EXIT_FAILURE;
1039
proc->buffer_size += BUFFER_SIZE;
1041
/* Read from the process */
1042
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1045
/* Read error from this process; ignore the error */
1053
proc->buffer_length += (size_t) sret;
1061
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1062
/* Fallback if all plugins failed, none are found or an error
1065
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1066
char *passwordbuffer = getpass("Password: ");
1067
size_t len = strlen(passwordbuffer);
1068
/* Strip trailing newline */
1069
if(len > 0 and passwordbuffer[len-1] == '\n'){
1070
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1073
bret = print_out_password(passwordbuffer, len);
1075
perror("print_out_password");
1076
exitstatus = EXIT_FAILURE;
1080
/* Restore old signal handler */
1081
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
perror("sigaction");
1084
exitstatus = EXIT_FAILURE;
1087
if(custom_argv != NULL){
1088
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1098
/* Kill the processes */
1099
for(plugin *p = plugin_list; p != NULL; p = p->next){
1102
ret = kill(p->pid, SIGTERM);
1103
if(ret == -1 and errno != ESRCH){
1104
/* Set-uid proccesses might not get closed */
1110
/* Wait for any remaining child processes to terminate */
1114
if(errno != ECHILD){