18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
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 */
42
#include <argp.h> /* argp */
46
typedef struct process{
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() */
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
69
#define BUFFER_SIZE 256
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
const char *argp_program_version = "plugin-runner " VERSION;
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
85
/* Variables used for running processes*/
50
89
size_t buffer_size;
51
90
size_t buffer_length;
55
typedef struct plugin{
56
char *name; /* can be "global" and any plugin name */
92
volatile bool completed;
60
94
struct plugin *next;
63
plugin *getplugin(char *name, plugin **plugin_list){
64
for (plugin *p = *plugin_list; p != NULL; p = p->next){
66
or (p->name and name and (strcmp(p->name, name) == 0))){
97
static plugin *plugin_list = NULL;
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
or (p->name and name and (strcmp(p->name, name) == 0))){
70
109
/* Create a new plugin */
71
110
plugin *new_plugin = malloc(sizeof(plugin));
72
if (new_plugin == NULL){
76
new_plugin->name = name;
111
if(new_plugin == NULL){
114
char *copy_name = NULL;
116
copy_name = strdup(name);
117
if(copy_name == NULL){
122
*new_plugin = (plugin) { .name = copy_name,
125
.next = plugin_list };
77
127
new_plugin->argv = malloc(sizeof(char *) * 2);
78
if (new_plugin->argv == NULL){
128
if(new_plugin->argv == NULL){
82
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
83
134
new_plugin->argv[1] = NULL;
85
new_plugin->disable = false;
86
new_plugin->next = *plugin_list;
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
139
free(new_plugin->argv);
143
new_plugin->environ[0] = NULL;
87
145
/* Append the new plugin to the list */
88
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
89
147
return new_plugin;
92
void addarguments(plugin *p, char *arg){
93
p->argv[p->argc] = arg;
94
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
100
p->argv[p->argc] = NULL;
103
#define BUFFER_SIZE 256
105
const char *argp_program_version =
106
"plugbasedclient 0.9";
107
const char *argp_program_bug_address =
108
"<mandos@fukt.bsnet.se>";
110
"Mandos plugin runner -- Run Mandos plugins";
111
/* A description of the arguments we accept. */
112
static char args_doc[] = "";
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
165
/* Insert the copy */
166
(*array)[*len] = copy;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
193
char *new = realloc(*e, strlen(def) + 1);
203
return add_to_char_array(def, &(p->environ), &(p->envc));
207
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
static int set_cloexec_flag(int fd){
212
int ret = fcntl(fd, F_GETFD, 0);
213
/* If reading the flags failed, return error indication now. */
217
/* Store modified flag word in the descriptor. */
218
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
222
/* Mark processes as completed when they exit, and save their exit
224
static void handle_sigchld(__attribute__((unused)) int sig){
226
plugin *proc = plugin_list;
228
pid_t pid = waitpid(-1, &status, WNOHANG);
230
/* Only still running child processes */
237
/* No child processes */
241
/* A child exited, find it in process_list */
242
while(proc != NULL and proc->pid != pid){
246
/* Process not found in process list */
249
proc->status = status;
250
proc->completed = true;
254
/* Prints out a password to stdout */
255
static bool print_out_password(const char *buffer, size_t length){
257
for(size_t written = 0; written < length; written += (size_t)ret){
258
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
267
/* Removes and free a plugin from the plugin list */
268
static void free_plugin(plugin *plugin_node){
270
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
273
free(plugin_node->argv);
274
for(char **env = plugin_node->environ; *env != NULL; env++){
277
free(plugin_node->environ);
278
free(plugin_node->buffer);
280
/* Removes the plugin from the singly-linked list */
281
if(plugin_node == plugin_list){
282
/* First one - simple */
283
plugin_list = plugin_list->next;
285
/* Second one or later */
286
for(plugin *p = plugin_list; p != NULL; p = p->next){
287
if(p->next == plugin_node){
288
p->next = plugin_node->next;
297
static void free_plugin_list(void){
298
while(plugin_list != NULL){
299
free_plugin(plugin_list);
114
303
int main(int argc, char *argv[]){
115
const char *plugindir = "plugins.d";
304
char *plugindir = NULL;
305
char *argfile = NULL;
116
307
size_t d_name_len;
118
309
struct dirent *dirst;
122
process *process_list = NULL;
312
int ret, numchars, maxfd = 0;
318
int exitstatus = EXIT_SUCCESS;
319
struct sigaction old_sigchld_action;
320
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
321
.sa_flags = SA_NOCLDSTOP };
322
char **custom_argv = NULL;
325
/* Establish a signal handler */
326
sigemptyset(&sigchld_action.sa_mask);
327
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
exitstatus = EXIT_FAILURE;
333
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
exitstatus = EXIT_FAILURE;
124
340
/* The options we understand. */
125
341
struct argp_option options[] = {
126
342
{ .name = "global-options", .key = 'g',
127
.arg = "option[,option[,...]]", .flags = 0,
128
.doc = "Options effecting all plugins" },
343
.arg = "OPTION[,OPTION[,...]]",
344
.doc = "Options passed to all plugins" },
345
{ .name = "global-env", .key = 'G',
347
.doc = "Environment variable passed to all plugins" },
129
348
{ .name = "options-for", .key = 'o',
130
.arg = "plugin:option[,option[,...]]", .flags = 0,
131
.doc = "Options effecting only specified plugins" },
132
{ .name = "disable-plugin", .key = 'd',
133
.arg = "Plugin[,Plugin[,...]]", .flags = 0,
134
.doc = "Option to disable specififed plugins" },
349
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
350
.doc = "Options passed only to specified plugin" },
351
{ .name = "env-for", .key = 'E',
352
.arg = "PLUGIN:ENV=value",
353
.doc = "Environment variable passed to specified plugin" },
354
{ .name = "disable", .key = 'd',
356
.doc = "Disable a specific plugin", .group = 1 },
357
{ .name = "enable", .key = 'e',
359
.doc = "Enable a specific plugin", .group = 1 },
135
360
{ .name = "plugin-dir", .key = 128,
136
.arg = "Directory", .flags = 0,
137
.doc = "Option to change directory to search for plugins" },
362
.doc = "Specify a different plugin directory", .group = 2 },
363
{ .name = "config-file", .key = 129,
365
.doc = "Specify a different configuration file", .group = 2 },
366
{ .name = "userid", .key = 130,
367
.arg = "ID", .flags = 0,
368
.doc = "User ID the plugins will run as", .group = 3 },
369
{ .name = "groupid", .key = 131,
370
.arg = "ID", .flags = 0,
371
.doc = "Group ID the plugins will run as", .group = 3 },
372
{ .name = "debug", .key = 132,
373
.doc = "Debug mode", .group = 4 },
141
error_t parse_opt (int key, char *arg, struct argp_state *state) {
142
/* Get the INPUT argument from `argp_parse', which we
143
know is a pointer to our arguments structure. */
144
plugin **plugins = state->input;
148
char *p = strtok(arg, ",");
150
addarguments(getplugin(NULL, plugins), p);
151
p = strtok(NULL, ",");
157
char *name = strtok(arg, ":");
158
char *p = strtok(NULL, ":");
161
addarguments(getplugin(name, plugins), p);
162
p = strtok(NULL, ",");
168
char *p = strtok(arg, ",");
170
getplugin(p, plugins)->disable = true;
171
p = strtok(NULL, ",");
184
return ARGP_ERR_UNKNOWN;
189
plugin *plugin_list = NULL;
191
struct argp argp = { .options = options, .parser = parse_opt,
192
.args_doc = args_doc, .doc = doc };
194
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
196
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
197
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
198
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
199
/* fprintf(stderr, "\tArg: %s\n", *a); */
205
dir = opendir(plugindir);
377
error_t parse_opt(int key, char *arg, __attribute__((unused))
378
struct argp_state *state) {
380
case 'g': /* --global-options */
383
while((p = strsep(&arg, ",")) != NULL){
387
if(not add_argument(getplugin(NULL), p)){
388
perror("add_argument");
389
return ARGP_ERR_UNKNOWN;
394
case 'G': /* --global-env */
398
if(not add_environment(getplugin(NULL), arg, true)){
399
perror("add_environment");
402
case 'o': /* --options-for */
404
char *p_name = strsep(&arg, ":");
405
if(p_name[0] == '\0' or arg == NULL){
408
char *opt = strsep(&arg, ":");
409
if(opt[0] == '\0' or opt == NULL){
413
while((p = strsep(&opt, ",")) != NULL){
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
424
case 'E': /* --env-for */
429
char *envdef = strchr(arg, ':');
434
if(not add_environment(getplugin(arg), envdef+1, true)){
435
perror("add_environment");
439
case 'd': /* --disable */
441
plugin *p = getplugin(arg);
443
return ARGP_ERR_UNKNOWN;
448
case 'e': /* --enable */
450
plugin *p = getplugin(arg);
452
return ARGP_ERR_UNKNOWN;
457
case 128: /* --plugin-dir */
459
plugindir = strdup(arg);
460
if(plugindir == NULL){
464
case 129: /* --config-file */
465
/* This is already done by parse_opt_config_file() */
467
case 130: /* --userid */
468
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
469
if(ret < 1 or tmpmax != (uid_t)tmpmax
470
or arg[numchars] != '\0'){
471
fprintf(stderr, "Bad user ID number: \"%s\", using %"
472
PRIdMAX "\n", arg, (intmax_t)uid);
477
case 131: /* --groupid */
478
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
479
if(ret < 1 or tmpmax != (gid_t)tmpmax
480
or arg[numchars] != '\0'){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
487
case 132: /* --debug */
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
505
return ARGP_ERR_UNKNOWN;
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state) {
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
524
case 129: /* --config-file */
526
argfile = strdup(arg);
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
538
return ARGP_ERR_UNKNOWN;
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
546
.doc = "Mandos plugin runner -- Run plugins" };
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
560
/* Open the configfile if available */
562
conffp = fopen(AFILE, "r");
564
conffp = fopen(argfile, "r");
567
char *org_line = NULL;
568
char *p, *arg, *new_arg, *line;
570
const char whitespace_delims[] = " \r\t\f\v\n";
571
const char comment_delim[] = "#";
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
577
exitstatus = EXIT_FAILURE;
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
583
/* for each line in the config file, strip whitespace and ignore
586
sret = getline(&org_line, &size, conffp);
592
arg = strsep(&line, comment_delim);
593
while((p = strsep(&arg, whitespace_delims)) != NULL){
600
exitstatus = EXIT_FAILURE;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
610
exitstatus = EXIT_FAILURE;
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
620
/* Check for harmful errors and go to fallback. Other errors might
621
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
exitstatus = EXIT_FAILURE;
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
630
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
640
/* Parse actual command line arguments, to let them override the
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
650
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
fprintf(stderr, "Plugin: %s has %d arguments\n",
652
p->name ? p->name : "Global", p->argc - 1);
653
for(char **a = p->argv; *a != NULL; a++){
654
fprintf(stderr, "\tArg: %s\n", *a);
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
657
for(char **a = p->environ; *a != NULL; a++){
658
fprintf(stderr, "\t%s\n", *a);
663
/* Strip permissions down to nobody */
673
if(plugindir == NULL){
676
dir = opendir(plugindir);
208
fprintf(stderr, "Can not open directory\n");
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
687
int dir_fd = dirfd(dir);
689
ret = set_cloexec_flag(dir_fd);
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
700
/* Read and execute any executable in the plugin directory*/
215
702
dirst = readdir(dir);
217
// All directory entries have been processed
704
/* All directory entries have been processed */
218
705
if(dirst == NULL){
708
exitstatus = EXIT_FAILURE;
222
714
d_name_len = strlen(dirst->d_name);
224
// Ignore dotfiles and backup files
225
if (dirst->d_name[0] == '.'
226
or dirst->d_name[d_name_len - 1] == '~'){
230
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
231
strcpy(filename, plugindir);
232
strcat(filename, "/");
233
strcat(filename, dirst->d_name);
237
if (S_ISREG(st.st_mode)
238
and (access(filename, X_OK) == 0)
239
and not (getplugin(dirst->d_name, &plugin_list)->disable)){
240
// Starting a new process to be watched
241
process *new_process = malloc(sizeof(process));
248
new_process->pid = fork();
249
if(new_process->pid == 0){
250
/* this is the child process */
716
/* Ignore dotfiles, backup files and other junk */
718
bool bad_name = false;
720
const char const *bad_prefixes[] = { ".", "#", NULL };
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
725
".dpkg-divert", NULL };
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
size_t pre_len = strlen(*pre);
728
if((d_name_len >= pre_len)
729
and strncmp((dirst->d_name), *pre, pre_len) == 0){
731
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
732
" with bad prefix %s\n", dirst->d_name, *pre);
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
size_t suf_len = strlen(*suf);
743
if((d_name_len >= suf_len)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
748
" with bad suffix %s\n", dirst->d_name, *suf);
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
771
ret = stat(filename, &st);
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
" with bad type or mode\n", filename);
788
plugin *p = getplugin(dirst->d_name);
796
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
803
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
806
for(char **a = g->argv + 1; *a != NULL; a++){
807
if(not add_argument(p, *a)){
808
perror("add_argument");
811
/* Add global environment variables */
812
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
814
perror("add_environment");
819
/* If this plugin has any environment variables, we will call
820
using execve and need to duplicate the environment from this
822
if(p->environ[0] != NULL){
823
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
825
perror("add_environment");
834
exitstatus = EXIT_FAILURE;
837
/* Ask OS to automatic close the pipe on exec */
838
ret = set_cloexec_flag(pipefd[0]);
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
844
ret = set_cloexec_flag(pipefd[1]);
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
850
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
857
/* Starting a new process to be watched */
861
exitstatus = EXIT_FAILURE;
865
/* this is the child process */
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
perror("sigprocmask");
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
884
/* If dir has no file descriptor, we could not set FD_CLOEXEC
885
above and must now close it manually here. */
252
close(pipefd[0]); /* close unused read end of pipe */
253
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
255
plugin *p = getplugin(dirst->d_name, &plugin_list);
256
plugin *g = getplugin(NULL, &plugin_list);
257
for(char **a = g->argv + 1; *a != NULL; a++){
888
if(p->environ[0] == NULL){
260
889
if(execv(filename, p->argv) < 0){
267
close(pipefd[1]); /* close unused write end of pipe */
268
new_process->fd = pipefd[0];
269
new_process->buffer = malloc(BUFFER_SIZE);
270
if (new_process->buffer == NULL){
274
new_process->buffer_size = BUFFER_SIZE;
275
new_process->buffer_length = 0;
276
FD_SET(new_process->fd, &rfds_orig);
278
if (maxfd < new_process->fd){
279
maxfd = new_process->fd;
283
new_process->next = process_list;
284
process_list = new_process;
894
if(execve(filename, p->argv, p->environ) < 0){
902
close(pipefd[1]); /* Close unused write end of pipe */
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
perror("sigprocmask");
911
exitstatus = EXIT_FAILURE;
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
918
/* Unblock SIGCHLD so signal handler can be run if this process
919
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
927
FD_SET(new_plugin->fd, &rfds_all);
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
290
if (process_list != NULL){
292
fd_set rfds = rfds_orig;
293
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
294
if (select_ret == -1){
298
for(process *process_itr = process_list; process_itr != NULL;
299
process_itr = process_itr->next){
300
if(FD_ISSET(process_itr->fd, &rfds)){
301
if(process_itr->buffer_length + BUFFER_SIZE
302
> process_itr->buffer_size){
303
process_itr->buffer = realloc(process_itr->buffer,
304
process_itr->buffer_size
305
+ (size_t) BUFFER_SIZE);
306
if (process_itr->buffer == NULL){
310
process_itr->buffer_size += BUFFER_SIZE;
312
ret = read(process_itr->fd, process_itr->buffer
313
+ process_itr->buffer_length, BUFFER_SIZE);
315
/* Read error from this process; ignore it */
318
process_itr->buffer_length += (size_t) ret;
321
/* wait for process exit */
323
waitpid(process_itr->pid, &status, 0);
324
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
325
for(size_t written = 0;
326
written < process_itr->buffer_length;){
327
ret = write(STDOUT_FILENO,
328
process_itr->buffer + written,
329
process_itr->buffer_length - written);
334
written += (size_t)ret;
338
FD_CLR(process_itr->fd, &rfds_orig);
348
for(process *process_itr = process_list; process_itr != NULL;
349
process_itr = process_itr->next){
350
close(process_itr->fd);
351
kill(process_itr->pid, SIGTERM);
352
free(process_itr->buffer);
937
for(plugin *p = plugin_list; p != NULL; p = p->next){
942
fprintf(stderr, "No plugin processes started. Incorrect plugin"
948
/* Main loop while running plugins exist */
950
fd_set rfds = rfds_all;
951
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
952
if(select_ret == -1){
954
exitstatus = EXIT_FAILURE;
957
/* OK, now either a process completed, or something can be read
959
for(plugin *proc = plugin_list; proc != NULL;){
960
/* Is this process completely done? */
961
if(proc->eof and proc->completed){
962
/* Only accept the plugin output if it exited cleanly */
963
if(not WIFEXITED(proc->status)
964
or WEXITSTATUS(proc->status) != 0){
965
/* Bad exit by plugin */
968
if(WIFEXITED(proc->status)){
969
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
970
" %d\n", (intmax_t) (proc->pid),
971
WEXITSTATUS(proc->status));
972
} else if(WIFSIGNALED(proc->status)) {
973
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
974
" %d\n", (intmax_t) (proc->pid),
975
WTERMSIG(proc->status));
976
} else if(WCOREDUMP(proc->status)){
977
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
978
(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){