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(),
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 */
68
#define BUFFER_SIZE 256
70
#define PDIR "/lib/mandos/plugins.d"
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
const char *argp_program_version = "plugin-runner " VERSION;
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
typedef struct plugin{
77
char *name; /* can be NULL or any plugin name */
84
/* Variables used for running processes*/
24
#include <stdio.h> /* popen, fileno */
25
#include <iso646.h> /* and, or, not */
26
#include <sys/types.h> /* DIR, opendir, stat, struct stat, waitpid,
27
WIFEXITED, WEXITSTATUS, wait */
28
#include <sys/wait.h> /* wait */
29
#include <dirent.h> /* DIR, opendir */
30
#include <sys/stat.h> /* stat, struct stat */
31
#include <unistd.h> /* stat, struct stat, chdir */
32
#include <stdlib.h> /* EXIT_FAILURE */
33
#include <sys/select.h> /* fd_set, select, FD_ZERO, FD_SET,
35
#include <string.h> /* strlen, strcpy, strcat */
36
#include <stdbool.h> /* true */
37
#include <sys/wait.h> /* waitpid, WIFEXITED, WEXITSTATUS */
38
#include <errno.h> /* errno */
39
#include <argp.h> /* argp */
43
typedef struct process{
88
47
size_t buffer_size;
89
48
size_t buffer_length;
91
volatile bool completed;
52
typedef struct plugin{
53
char *name; /* can be "global" and any plugin name */
93
56
struct plugin *next;
96
static plugin *plugin_list = NULL;
98
/* Gets an existing plugin based on name,
99
or if none is found, creates a new one */
100
static plugin *getplugin(char *name){
101
/* Check for exiting plugin with that name */
102
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
or (p->name and name and (strcmp(p->name, name) == 0))){
59
plugin *getplugin(char *name, plugin **plugin_list){
60
for (plugin *p = *plugin_list; p != NULL; p = p->next){
62
or (p->name and name and (strcmp(p->name, name) == 0))){
108
66
/* Create a new plugin */
109
67
plugin *new_plugin = malloc(sizeof(plugin));
110
if(new_plugin == NULL){
113
char *copy_name = NULL;
115
copy_name = strdup(name);
116
if(copy_name == NULL){
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
68
if (new_plugin == NULL){
72
new_plugin->name = name;
126
73
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if(new_plugin->argv == NULL){
74
if (new_plugin->argv == NULL){
132
new_plugin->argv[0] = copy_name;
78
new_plugin->argv[0] = name;
133
79
new_plugin->argv[1] = NULL;
135
new_plugin->environ = malloc(sizeof(char *));
136
if(new_plugin->environ == NULL){
138
free(new_plugin->argv);
142
new_plugin->environ[0] = NULL;
144
81
/* Append the new plugin to the list */
145
plugin_list = new_plugin;
82
new_plugin->next = *plugin_list;
83
*plugin_list = new_plugin;
146
84
return new_plugin;
149
/* Helper function for add_argument and add_environment */
150
static bool add_to_char_array(const char *new, char ***array,
152
/* Resize the pointed-to array to hold one more pointer */
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
159
/* Make a copy of the new string */
160
char *copy = strdup(new);
164
/* Insert the copy */
165
(*array)[*len] = copy;
167
/* Add a new terminating NULL pointer to the last element */
168
(*array)[*len] = NULL;
172
/* Add to a plugin's argument vector */
173
static bool add_argument(plugin *p, const char *arg){
177
return add_to_char_array(arg, &(p->argv), &(p->argc));
180
/* Add to a plugin's environment */
181
static bool add_environment(plugin *p, const char *def, bool replace){
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
192
char *new = realloc(*e, strlen(def) + 1);
202
return add_to_char_array(def, &(p->environ), &(p->envc));
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
210
static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
212
/* If reading the flags failed, return error indication now. */
216
/* Store modified flag word in the descriptor. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
/* Mark processes as completed when they exit, and save their exit
223
static void handle_sigchld(__attribute__((unused)) int sig){
225
plugin *proc = plugin_list;
227
pid_t pid = waitpid(-1, &status, WNOHANG);
229
/* Only still running child processes */
236
/* No child processes */
240
/* A child exited, find it in process_list */
241
while(proc != NULL and proc->pid != pid){
245
/* Process not found in process list */
248
proc->status = status;
249
proc->completed = true;
253
/* Prints out a password to stdout */
254
static bool print_out_password(const char *buffer, size_t length){
256
for(size_t written = 0; written < length; written += (size_t)ret){
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
266
/* Removes and free a plugin from the plugin list */
267
static void free_plugin(plugin *plugin_node){
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(plugin_node->argv);
273
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(plugin_node->environ);
277
free(plugin_node->buffer);
279
/* Removes the plugin from the singly-linked list */
280
if(plugin_node == plugin_list){
281
/* First one - simple */
282
plugin_list = plugin_list->next;
284
/* Second one or later */
285
for(plugin *p = plugin_list; p != NULL; p = p->next){
286
if(p->next == plugin_node){
287
p->next = plugin_node->next;
296
static void free_plugin_list(void){
297
while(plugin_list != NULL){
298
free_plugin(plugin_list);
87
void addarguments(plugin *p, char *arg){
88
p->argv[p->argc] = arg;
89
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
95
p->argv[p->argc] = NULL;
98
#define BUFFER_SIZE 256
100
const char *argp_program_version =
101
"plugbasedclient 0.9";
102
const char *argp_program_bug_address =
103
"<mandos@fukt.bsnet.se>";
105
"Mandos plugin runner -- Run Mandos plugins";
106
/* A description of the arguments we accept. */
107
static char args_doc[] = "";
302
109
int main(int argc, char *argv[]){
303
char *plugindir = NULL;
304
char *argfile = NULL;
110
char plugindir[] = "plugins.d";
111
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
308
113
struct dirent *dirst;
311
116
int ret, maxfd = 0;
316
int exitstatus = EXIT_SUCCESS;
317
struct sigaction old_sigchld_action;
318
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
319
.sa_flags = SA_NOCLDSTOP };
320
char **custom_argv = NULL;
323
/* Establish a signal handler */
324
sigemptyset(&sigchld_action.sa_mask);
325
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
328
exitstatus = EXIT_FAILURE;
331
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
334
exitstatus = EXIT_FAILURE;
117
process *process_list = NULL;
338
119
/* The options we understand. */
339
120
struct argp_option options[] = {
340
121
{ .name = "global-options", .key = 'g',
341
.arg = "OPTION[,OPTION[,...]]",
342
.doc = "Options passed to all plugins" },
343
{ .name = "global-env", .key = 'G',
345
.doc = "Environment variable passed to all plugins" },
122
.arg = "option[,option[,...]]", .flags = 0,
123
.doc = "Options effecting all plugins" },
346
124
{ .name = "options-for", .key = 'o',
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
348
.doc = "Options passed only to specified plugin" },
349
{ .name = "env-for", .key = 'E',
350
.arg = "PLUGIN:ENV=value",
351
.doc = "Environment variable passed to specified plugin" },
352
{ .name = "disable", .key = 'd',
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
357
.doc = "Enable a specific plugin", .group = 1 },
358
{ .name = "plugin-dir", .key = 128,
360
.doc = "Specify a different plugin directory", .group = 2 },
361
{ .name = "config-file", .key = 129,
363
.doc = "Specify a different configuration file", .group = 2 },
364
{ .name = "userid", .key = 130,
365
.arg = "ID", .flags = 0,
366
.doc = "User ID the plugins will run as", .group = 3 },
367
{ .name = "groupid", .key = 131,
368
.arg = "ID", .flags = 0,
369
.doc = "Group ID the plugins will run as", .group = 3 },
370
{ .name = "debug", .key = 132,
371
.doc = "Debug mode", .group = 4 },
125
.arg = "plugin:option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting only specified plugins" },
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
378
case 'g': /* --global-options */
381
while((p = strsep(&arg, ",")) != NULL){
385
if(not add_argument(getplugin(NULL), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
392
case 'G': /* --global-env */
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
400
case 'o': /* --options-for */
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
411
while((p = strsep(&opt, ",")) != NULL){
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
422
case 'E': /* --env-for */
427
char *envdef = strchr(arg, ':');
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
437
case 'd': /* --disable */
439
plugin *p = getplugin(arg);
441
return ARGP_ERR_UNKNOWN;
446
case 'e': /* --enable */
448
plugin *p = getplugin(arg);
450
return ARGP_ERR_UNKNOWN;
455
case 128: /* --plugin-dir */
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
465
case 130: /* --userid */
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
473
case 131: /* --groupid */
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
481
case 132: /* --debug */
485
* When adding more options before this line, remember to also add a
486
* "case" to the "parse_opt_config_file" function below.
489
/* Cryptsetup always passes an argument, which is an empty
490
string if "none" was specified in /etc/crypttab. So if
491
argument was empty, we ignore it silently. */
493
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
499
return ARGP_ERR_UNKNOWN;
504
/* This option parser is the same as parse_opt() above, except it
505
ignores everything but the --config-file option. */
506
error_t parse_opt_config_file(int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
510
case 'g': /* --global-options */
511
case 'G': /* --global-env */
512
case 'o': /* --options-for */
513
case 'E': /* --env-for */
514
case 'd': /* --disable */
515
case 'e': /* --enable */
516
case 128: /* --plugin-dir */
518
case 129: /* --config-file */
520
argfile = strdup(arg);
525
case 130: /* --userid */
526
case 131: /* --groupid */
527
case 132: /* --debug */
532
return ARGP_ERR_UNKNOWN;
537
struct argp argp = { .options = options,
538
.parser = parse_opt_config_file,
540
.doc = "Mandos plugin runner -- Run plugins" };
542
/* Parse using parse_opt_config_file() in order to get the custom
543
config file location, if any. */
544
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
545
if(ret == ARGP_ERR_UNKNOWN){
546
fprintf(stderr, "Unknown error while parsing arguments\n");
547
exitstatus = EXIT_FAILURE;
551
/* Reset to the normal argument parser */
552
argp.parser = parse_opt;
554
/* Open the configfile if available */
556
conffp = fopen(AFILE, "r");
558
conffp = fopen(argfile, "r");
561
char *org_line = NULL;
562
char *p, *arg, *new_arg, *line;
564
const char whitespace_delims[] = " \r\t\f\v\n";
565
const char comment_delim[] = "#";
568
custom_argv = malloc(sizeof(char*) * 2);
569
if(custom_argv == NULL){
571
exitstatus = EXIT_FAILURE;
574
custom_argv[0] = argv[0];
575
custom_argv[1] = NULL;
577
/* for each line in the config file, strip whitespace and ignore
580
sret = getline(&org_line, &size, conffp);
586
arg = strsep(&line, comment_delim);
587
while((p = strsep(&arg, whitespace_delims)) != NULL){
594
exitstatus = EXIT_FAILURE;
600
custom_argv = realloc(custom_argv, sizeof(char *)
601
* ((unsigned int) custom_argc + 1));
602
if(custom_argv == NULL){
604
exitstatus = EXIT_FAILURE;
608
custom_argv[custom_argc-1] = new_arg;
609
custom_argv[custom_argc] = NULL;
614
/* Check for harmful errors and go to fallback. Other errors might
615
not affect opening plugins */
616
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
618
exitstatus = EXIT_FAILURE;
622
/* If there was any arguments from configuration file,
623
pass them to parser as command arguments */
624
if(custom_argv != NULL){
625
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
627
if(ret == ARGP_ERR_UNKNOWN){
628
fprintf(stderr, "Unknown error while parsing arguments\n");
629
exitstatus = EXIT_FAILURE;
634
/* Parse actual command line arguments, to let them override the
636
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if(ret == ARGP_ERR_UNKNOWN){
638
fprintf(stderr, "Unknown error while parsing arguments\n");
639
exitstatus = EXIT_FAILURE;
644
for(plugin *p = plugin_list; p != NULL; p=p->next){
645
fprintf(stderr, "Plugin: %s has %d arguments\n",
646
p->name ? p->name : "Global", p->argc - 1);
647
for(char **a = p->argv; *a != NULL; a++){
648
fprintf(stderr, "\tArg: %s\n", *a);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
651
for(char **a = p->environ; *a != NULL; a++){
652
fprintf(stderr, "\t%s\n", *a);
657
/* Strip permissions down to nobody */
667
if(plugindir == NULL){
670
dir = opendir(plugindir);
130
error_t parse_opt (int key, char *arg, struct argp_state *state) {
131
/* Get the INPUT argument from `argp_parse', which we
132
know is a pointer to our arguments structure. */
133
plugin **plugins = state->input;
137
char *p = strtok(arg, ",");
139
addarguments(getplugin(NULL, plugins), p);
140
p = strtok(NULL, ",");
146
char *name = strtok(arg, ":");
147
char *p = strtok(NULL, ":");
150
addarguments(getplugin(name, plugins), p);
151
p = strtok(NULL, ",");
161
return ARGP_ERR_UNKNOWN;
166
plugin *plugin_list = NULL;
168
struct argp argp = { .options = options, .parser = parse_opt,
169
.args_doc = args_doc, .doc = doc };
171
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
173
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
174
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
175
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
176
/* fprintf(stderr, "\tArg: %s\n", *a); */
182
dir = opendir(plugindir);
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
681
int dir_fd = dirfd(dir);
683
ret = set_cloexec_flag(dir_fd);
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
694
/* Read and execute any executable in the plugin directory*/
185
fprintf(stderr, "Can not open directory\n");
696
192
dirst = readdir(dir);
698
/* All directory entries have been processed */
194
// All directory entries have been processed
699
195
if(dirst == NULL){
702
exitstatus = EXIT_FAILURE;
708
199
d_name_len = strlen(dirst->d_name);
710
/* Ignore dotfiles, backup files and other junk */
712
bool bad_name = false;
714
const char const *bad_prefixes[] = { ".", "#", NULL };
716
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
719
".dpkg-divert", NULL };
720
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
721
size_t pre_len = strlen(*pre);
722
if((d_name_len >= pre_len)
723
and strncmp((dirst->d_name), *pre, pre_len) == 0){
725
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
726
" with bad prefix %s\n", dirst->d_name, *pre);
735
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
736
size_t suf_len = strlen(*suf);
737
if((d_name_len >= suf_len)
738
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
741
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
742
" with bad suffix %s\n", dirst->d_name, *suf);
755
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
ret = stat(filename, &st);
772
/* Ignore non-executable files */
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
" with bad type or mode\n", filename);
782
plugin *p = getplugin(dirst->d_name);
790
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
797
/* Add global arguments to argument list for this plugin */
798
plugin *g = getplugin(NULL);
201
// Ignore dotfiles and backup files
202
if (dirst->d_name[0] == '.'
203
or dirst->d_name[d_name_len - 1] == '~'){
207
char *filename = malloc(d_name_len + plugindir_len + 2);
208
strcpy(filename, plugindir);
209
strcat(filename, "/");
210
strcat(filename, dirst->d_name);
214
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
215
// Starting a new process to be watched
216
process *new_process = malloc(sizeof(process));
223
new_process->pid = fork();
224
if(new_process->pid == 0){
225
/* this is the child process */
227
close(pipefd[0]); /* close unused read end of pipe */
228
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
230
basename = strrchr(filename, '/');
231
if (basename == NULL){
236
plugin *p = getplugin(basename, &plugin_list);
238
plugin *g = getplugin(NULL, &plugin_list);
800
239
for(char **a = g->argv + 1; *a != NULL; a++){
801
if(not add_argument(p, *a)){
802
perror("add_argument");
805
/* Add global environment variables */
806
for(char **e = g->environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
808
perror("add_environment");
813
/* If this plugin has any environment variables, we will call
814
using execve and need to duplicate the environment from this
816
if(p->environ[0] != NULL){
817
for(char **e = environ; *e != NULL; e++){
818
if(not add_environment(p, *e, false)){
819
perror("add_environment");
828
exitstatus = EXIT_FAILURE;
831
/* Ask OS to automatic close the pipe on exec */
832
ret = set_cloexec_flag(pipefd[0]);
834
perror("set_cloexec_flag");
835
exitstatus = EXIT_FAILURE;
838
ret = set_cloexec_flag(pipefd[1]);
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
844
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
847
perror("sigprocmask");
848
exitstatus = EXIT_FAILURE;
851
/* Starting a new process to be watched */
855
exitstatus = EXIT_FAILURE;
859
/* this is the child process */
860
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
865
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
867
perror("sigprocmask");
871
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
/* If dir has no file descriptor, we could not set FD_CLOEXEC
879
above and must now close it manually here. */
882
if(p->environ[0] == NULL){
883
242
if(execv(filename, p->argv) < 0){
888
if(execve(filename, p->argv, p->environ) < 0){
896
close(pipefd[1]); /* Close unused write end of pipe */
898
plugin *new_plugin = getplugin(dirst->d_name);
899
if(new_plugin == NULL){
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
903
perror("sigprocmask");
905
exitstatus = EXIT_FAILURE;
909
new_plugin->pid = pid;
910
new_plugin->fd = pipefd[0];
912
/* Unblock SIGCHLD so signal handler can be run if this process
913
has already completed */
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
916
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
921
FD_SET(new_plugin->fd, &rfds_all);
923
if(maxfd < new_plugin->fd){
924
maxfd = new_plugin->fd;
249
close(pipefd[1]); /* close unused write end of pipe */
250
new_process->fd = pipefd[0];
251
new_process->buffer = malloc(BUFFER_SIZE);
252
if (new_process->buffer == NULL){
256
new_process->buffer_size = BUFFER_SIZE;
257
new_process->buffer_length = 0;
258
FD_SET(new_process->fd, &rfds_orig);
260
if (maxfd < new_process->fd){
261
maxfd = new_process->fd;
265
new_process->next = process_list;
266
process_list = new_process;
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
272
if (process_list != NULL){
274
fd_set rfds = rfds_orig;
275
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
276
if (select_ret == -1){
280
for(process *process_itr = process_list; process_itr != NULL;
281
process_itr = process_itr->next){
282
if(FD_ISSET(process_itr->fd, &rfds)){
283
if(process_itr->buffer_length + BUFFER_SIZE
284
> process_itr->buffer_size){
285
process_itr->buffer = realloc(process_itr->buffer,
286
process_itr->buffer_size
287
+ (size_t) BUFFER_SIZE);
288
if (process_itr->buffer == NULL){
292
process_itr->buffer_size += BUFFER_SIZE;
294
ret = read(process_itr->fd, process_itr->buffer
295
+ process_itr->buffer_length, BUFFER_SIZE);
297
/* Read error from this process; ignore it */
300
process_itr->buffer_length += (size_t) ret;
303
/* wait for process exit */
305
waitpid(process_itr->pid, &status, 0);
306
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
307
for(size_t written = 0;
308
written < process_itr->buffer_length;){
309
ret = write(STDOUT_FILENO,
310
process_itr->buffer + written,
311
process_itr->buffer_length - written);
316
written += (size_t)ret;
320
FD_CLR(process_itr->fd, &rfds_orig);
330
for(process *process_itr = process_list; process_itr != NULL;
331
process_itr = process_itr->next){
332
close(process_itr->fd);
333
kill(process_itr->pid, SIGTERM);
334
free(process_itr->buffer);
936
fprintf(stderr, "No plugin processes started. Incorrect plugin"
942
/* Main loop while running plugins exist */
944
fd_set rfds = rfds_all;
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if(select_ret == -1){
948
exitstatus = EXIT_FAILURE;
951
/* OK, now either a process completed, or something can be read
953
for(plugin *proc = plugin_list; proc != NULL;){
954
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
956
/* Only accept the plugin output if it exited cleanly */
957
if(not WIFEXITED(proc->status)
958
or WEXITSTATUS(proc->status) != 0){
959
/* Bad exit by plugin */
962
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
965
WEXITSTATUS(proc->status));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
970
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
976
/* Remove the plugin */
977
FD_CLR(proc->fd, &rfds_all);
979
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
perror("sigprocmask");
983
exitstatus = EXIT_FAILURE;
987
plugin *next_plugin = proc->next;
991
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
995
perror("sigprocmask");
996
exitstatus = EXIT_FAILURE;
1000
if(plugin_list == NULL){
1007
/* This process exited nicely, so print its buffer */
1009
bool bret = print_out_password(proc->buffer,
1010
proc->buffer_length);
1012
perror("print_out_password");
1013
exitstatus = EXIT_FAILURE;
1018
/* This process has not completed. Does it have any output? */
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1020
/* This process had nothing to say at this time */
1024
/* Before reading, make the process' data buffer large enough */
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
+ (size_t) BUFFER_SIZE);
1028
if(proc->buffer == NULL){
1030
exitstatus = EXIT_FAILURE;
1033
proc->buffer_size += BUFFER_SIZE;
1035
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1039
/* Read error from this process; ignore the error */
1047
proc->buffer_length += (size_t) sret;
1055
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1056
/* Fallback if all plugins failed, none are found or an error
1059
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1060
char *passwordbuffer = getpass("Password: ");
1061
size_t len = strlen(passwordbuffer);
1062
/* Strip trailing newline */
1063
if(len > 0 and passwordbuffer[len-1] == '\n'){
1064
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1067
bret = print_out_password(passwordbuffer, len);
1069
perror("print_out_password");
1070
exitstatus = EXIT_FAILURE;
1074
/* Restore old signal handler */
1075
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1077
perror("sigaction");
1078
exitstatus = EXIT_FAILURE;
1081
if(custom_argv != NULL){
1082
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
/* Kill the processes */
1093
for(plugin *p = plugin_list; p != NULL; p = p->next){
1096
ret = kill(p->pid, SIGTERM);
1097
if(ret == -1 and errno != ESRCH){
1098
/* Set-uid proccesses might not get closed */
1104
/* Wait for any remaining child processes to terminate */
1108
if(errno != ECHILD){