18
18
* along with this program. If not, see
19
19
* <http://www.gnu.org/licenses/>.
21
* 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/>.
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
#include <errno.h> /* errno */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
67
#define BUFFER_SIZE 256
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
const char *argp_program_version = "plugin-runner 1.0";
73
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*/
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{
89
50
size_t buffer_size;
90
51
size_t buffer_length;
92
volatile bool completed;
55
typedef struct plugin{
56
char *name; /* can be "global" and any plugin name */
94
59
struct plugin *next;
97
static plugin *plugin_list = NULL;
99
/* Gets a 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){
62
plugin *getplugin(char *name, plugin **plugin_list){
63
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
64
if ((p->name == name)
105
65
or (p->name and name and (strcmp(p->name, name) == 0))){
109
69
/* Create a new plugin */
110
70
plugin *new_plugin = malloc(sizeof(plugin));
111
71
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 };
75
new_plugin->name = name;
127
76
new_plugin->argv = malloc(sizeof(char *) * 2);
128
77
if (new_plugin->argv == NULL){
133
new_plugin->argv[0] = copy_name;
81
new_plugin->argv[0] = name;
134
82
new_plugin->argv[1] = NULL;
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
139
free(new_plugin->argv);
143
new_plugin->environ[0] = NULL;
145
84
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
85
new_plugin->next = *plugin_list;
86
*plugin_list = new_plugin;
147
87
return new_plugin;
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));
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)
213
int ret = fcntl(fd, F_GETFD, 0);
214
/* If reading the flags failed, return error indication now. */
218
/* Store modified flag word in the descriptor. */
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
223
/* Mark processes as completed when they exit, and save their exit
225
void handle_sigchld(__attribute__((unused)) int sig){
227
plugin *proc = plugin_list;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
231
/* Only still running child processes */
235
if (errno != ECHILD){
238
/* No child processes */
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
247
/* Process not found in process list */
250
proc->status = status;
251
proc->completed = true;
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
258
if(length>0 and buffer[length-1] == '\n'){
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);
90
void addarguments(plugin *p, char *arg){
91
p->argv[p->argc] = arg;
92
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
98
p->argv[p->argc] = NULL;
101
#define BUFFER_SIZE 256
103
const char *argp_program_version =
104
"plugbasedclient 0.9";
105
const char *argp_program_bug_address =
106
"<mandos@fukt.bsnet.se>";
108
"Mandos plugin runner -- Run Mandos plugins";
109
/* A description of the arguments we accept. */
110
static char args_doc[] = "";
307
112
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
113
char plugindir[] = "plugins.d";
114
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
313
116
struct dirent *dirst;
316
119
int ret, maxfd = 0;
320
int exitstatus = EXIT_SUCCESS;
321
struct sigaction old_sigchld_action;
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
327
/* Establish a signal handler */
328
sigemptyset(&sigchld_action.sa_mask);
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
exitstatus = EXIT_FAILURE;
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
exitstatus = EXIT_FAILURE;
120
process *process_list = NULL;
342
122
/* The options we understand. */
343
123
struct argp_option options[] = {
344
124
{ .name = "global-options", .key = 'g',
345
.arg = "OPTION[,OPTION[,...]]",
346
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
349
.doc = "Environment variable passed to all plugins" },
125
.arg = "option[,option[,...]]", .flags = 0,
126
.doc = "Options effecting all plugins" },
350
127
{ .name = "options-for", .key = 'o',
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
{ .name = "disable", .key = 'd',
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "plugin-dir", .key = 128,
361
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
128
.arg = "plugin:option[,option[,...]]", .flags = 0,
129
.doc = "Options effecting only specified plugins" },
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
378
/* Get the INPUT argument from `argp_parse', which we know is a
379
pointer to our plugin list pointer. */
133
error_t parse_opt (int key, char *arg, struct argp_state *state) {
134
/* Get the INPUT argument from `argp_parse', which we
135
know is a pointer to our arguments structure. */
136
plugin **plugins = state->input;
381
case 'g': /* --global-options */
384
while((p = strsep(&arg, ",")) != NULL){
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
395
case 'e': /* --global-env */
400
char *envdef = strdup(arg);
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
409
case 'o': /* --options-for */
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
415
char *opt = strsep(&arg, ":");
421
while((p = strsep(&opt, ",")) != NULL){
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
433
case 'f': /* --env-for */
438
char *envdef = strchr(arg, ':');
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
452
case 'd': /* --disable */
454
plugin *p = getplugin(arg);
456
return ARGP_ERR_UNKNOWN;
461
case 128: /* --plugin-dir */
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
467
case 129: /* --config-file */
468
argfile = strdup(arg);
473
case 130: /* --userid */
474
uid = (uid_t)strtol(arg, NULL, 10);
476
case 131: /* --groupid */
477
gid = (gid_t)strtol(arg, NULL, 10);
479
case 132: /* --debug */
140
char *p = strtok(arg, ",");
142
addarguments(getplugin(NULL, plugins), p);
143
p = strtok(NULL, ",");
149
char *name = strtok(arg, ":");
150
char *p = strtok(NULL, ":");
153
addarguments(getplugin(name, plugins), p);
154
p = strtok(NULL, ",");
482
158
case ARGP_KEY_ARG:
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
485
161
case ARGP_KEY_END:
169
plugin *plugin_list = NULL;
493
171
struct argp argp = { .options = options, .parser = parse_opt,
495
.doc = "Mandos plugin runner -- Run plugins" };
497
/* Open the configfile if available */
498
if (argfile == NULL){
499
conffp = fopen(AFILE, "r");
501
conffp = fopen(argfile, "r");
504
char *org_line = NULL;
505
char *p, *arg, *new_arg, *line;
508
const char whitespace_delims[] = " \r\t\f\v\n";
509
const char comment_delim[] = "#";
512
custom_argv = malloc(sizeof(char*) * 2);
513
if(custom_argv == NULL){
515
exitstatus = EXIT_FAILURE;
518
custom_argv[0] = argv[0];
519
custom_argv[1] = NULL;
521
/* for each line in the config file, strip whitespace and ignore
524
sret = getline(&org_line, &size, conffp);
530
arg = strsep(&line, comment_delim);
531
while((p = strsep(&arg, whitespace_delims)) != NULL){
538
exitstatus = EXIT_FAILURE;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
548
exitstatus = EXIT_FAILURE;
552
custom_argv[custom_argc-1] = new_arg;
553
custom_argv[custom_argc] = NULL;
558
/* Check for harmful errors and go to fallback. Other errors might
559
not affect opening plugins */
560
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
562
exitstatus = EXIT_FAILURE;
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
568
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
571
if (ret == ARGP_ERR_UNKNOWN){
572
fprintf(stderr, "Unknown error while parsing arguments\n");
573
exitstatus = EXIT_FAILURE;
578
/* Parse actual command line arguments, to let them override the
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
588
for(plugin *p = plugin_list; p != NULL; p=p->next){
589
fprintf(stderr, "Plugin: %s has %d arguments\n",
590
p->name ? p->name : "Global", p->argc - 1);
591
for(char **a = p->argv; *a != NULL; a++){
592
fprintf(stderr, "\tArg: %s\n", *a);
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
595
for(char **a = p->environ; *a != NULL; a++){
596
fprintf(stderr, "\t%s\n", *a);
601
/* Strip permissions down to nobody */
611
if (plugindir == NULL){
614
dir = opendir(plugindir);
172
.args_doc = args_doc, .doc = doc };
174
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
176
/* for(plugin *p = plugin_list; p != NULL; p=p->next){ */
177
/* fprintf(stderr, "Plugin: %s has %d arguments\n", p->name ? p->name : "Global", p->argc); */
178
/* for(char **a = p->argv + 1; *a != NULL; a++){ */
179
/* fprintf(stderr, "\tArg: %s\n", *a); */
185
dir = opendir(plugindir);
618
perror("Could not open plugin dir");
619
exitstatus = EXIT_FAILURE;
623
/* Set the FD_CLOEXEC flag on the directory, if possible */
625
int dir_fd = dirfd(dir);
627
ret = set_cloexec_flag(dir_fd);
629
perror("set_cloexec_flag");
630
exitstatus = EXIT_FAILURE;
638
/* Read and execute any executable in the plugin directory*/
188
fprintf(stderr, "Can not open directory\n");
640
195
dirst = readdir(dir);
642
/* All directory entries have been processed */
197
// All directory entries have been processed
643
198
if(dirst == NULL){
646
exitstatus = EXIT_FAILURE;
652
202
d_name_len = strlen(dirst->d_name);
654
/* Ignore dotfiles, backup files and other junk */
656
bool bad_name = false;
658
const char const *bad_prefixes[] = { ".", "#", NULL };
660
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
662
".dpkg-divert", NULL };
663
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
664
size_t pre_len = strlen(*pre);
665
if((d_name_len >= pre_len)
666
and strncmp((dirst->d_name), *pre, pre_len) == 0){
668
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
669
" with bad prefix %s\n", dirst->d_name, *pre);
678
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
size_t suf_len = strlen(*suf);
680
if((d_name_len >= suf_len)
681
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
684
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
685
" with bad suffix %s\n", dirst->d_name, *suf);
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
704
ret = stat(filename, &st);
711
/* Ignore non-executable files */
712
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
714
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
715
" with bad type or mode\n", filename);
721
plugin *p = getplugin(dirst->d_name);
729
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
736
/* Add global arguments to argument list for this plugin */
737
plugin *g = getplugin(NULL);
204
// Ignore dotfiles and backup files
205
if (dirst->d_name[0] == '.'
206
or dirst->d_name[d_name_len - 1] == '~'){
210
char *filename = malloc(d_name_len + plugindir_len + 2);
211
strcpy(filename, plugindir);
212
strcat(filename, "/");
213
strcat(filename, dirst->d_name);
217
if (S_ISREG(st.st_mode) and (access(filename, X_OK) == 0)){
218
// Starting a new process to be watched
219
process *new_process = malloc(sizeof(process));
226
new_process->pid = fork();
227
if(new_process->pid == 0){
228
/* this is the child process */
230
close(pipefd[0]); /* close unused read end of pipe */
231
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
233
basename = strrchr(filename, '/');
234
if (basename == NULL){
239
plugin *p = getplugin(basename, &plugin_list);
241
plugin *g = getplugin(NULL, &plugin_list);
739
242
for(char **a = g->argv + 1; *a != NULL; a++){
740
if(not add_argument(p, *a)){
741
perror("add_argument");
744
/* Add global environment variables */
745
for(char **e = g->environ; *e != NULL; e++){
746
if(not add_environment(p, *e, false)){
747
perror("add_environment");
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
755
if(p->environ[0] != NULL){
756
for(char **e = environ; *e != NULL; e++){
757
if(not add_environment(p, *e, false)){
758
perror("add_environment");
767
exitstatus = EXIT_FAILURE;
770
/* Ask OS to automatic close the pipe on exec */
771
ret = set_cloexec_flag(pipefd[0]);
773
perror("set_cloexec_flag");
774
exitstatus = EXIT_FAILURE;
777
ret = set_cloexec_flag(pipefd[1]);
779
perror("set_cloexec_flag");
780
exitstatus = EXIT_FAILURE;
783
/* Block SIGCHLD until process is safely in process list */
784
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
786
perror("sigprocmask");
787
exitstatus = EXIT_FAILURE;
790
/* Starting a new process to be watched */
794
exitstatus = EXIT_FAILURE;
798
/* this is the child process */
799
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
804
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
806
perror("sigprocmask");
810
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
817
/* If dir has no file descriptor, we could not set FD_CLOEXEC
818
above and must now close it manually here. */
821
if(p->environ[0] == NULL){
822
245
if(execv(filename, p->argv) < 0){
827
if(execve(filename, p->argv, p->environ) < 0){
835
close(pipefd[1]); /* Close unused write end of pipe */
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
842
perror("sigprocmask");
844
exitstatus = EXIT_FAILURE;
848
new_plugin->pid = pid;
849
new_plugin->fd = pipefd[0];
851
/* Unblock SIGCHLD so signal handler can be run if this process
852
has already completed */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
855
perror("sigprocmask");
856
exitstatus = EXIT_FAILURE;
860
FD_SET(new_plugin->fd, &rfds_all);
862
if (maxfd < new_plugin->fd){
863
maxfd = new_plugin->fd;
252
close(pipefd[1]); /* close unused write end of pipe */
253
new_process->fd = pipefd[0];
254
new_process->buffer = malloc(BUFFER_SIZE);
255
if (new_process->buffer == NULL){
259
new_process->buffer_size = BUFFER_SIZE;
260
new_process->buffer_length = 0;
261
FD_SET(new_process->fd, &rfds_orig);
263
if (maxfd < new_process->fd){
264
maxfd = new_process->fd;
268
new_process->next = process_list;
269
process_list = new_process;
871
for(plugin *p = plugin_list; p != NULL; p = p->next){
275
if (process_list != NULL){
277
fd_set rfds = rfds_orig;
278
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
279
if (select_ret == -1){
283
for(process *process_itr = process_list; process_itr != NULL;
284
process_itr = process_itr->next){
285
if(FD_ISSET(process_itr->fd, &rfds)){
286
if(process_itr->buffer_length + BUFFER_SIZE
287
> process_itr->buffer_size){
288
process_itr->buffer = realloc(process_itr->buffer,
289
process_itr->buffer_size
290
+ (size_t) BUFFER_SIZE);
291
if (process_itr->buffer == NULL){
295
process_itr->buffer_size += BUFFER_SIZE;
297
ret = read(process_itr->fd, process_itr->buffer
298
+ process_itr->buffer_length, BUFFER_SIZE);
300
/* Read error from this process; ignore it */
303
process_itr->buffer_length += (size_t) ret;
306
/* wait for process exit */
308
waitpid(process_itr->pid, &status, 0);
309
if(WIFEXITED(status) and WEXITSTATUS(status) == 0){
310
for(size_t written = 0;
311
written < process_itr->buffer_length;){
312
ret = write(STDOUT_FILENO,
313
process_itr->buffer + written,
314
process_itr->buffer_length - written);
319
written += (size_t)ret;
323
FD_CLR(process_itr->fd, &rfds_orig);
333
for(process *process_itr = process_list; process_itr != NULL;
334
process_itr = process_itr->next){
335
close(process_itr->fd);
336
kill(process_itr->pid, SIGTERM);
337
free(process_itr->buffer);
876
fprintf(stderr, "No plugin processes started. Incorrect plugin"
882
/* Main loop while running plugins exist */
884
fd_set rfds = rfds_all;
885
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
886
if (select_ret == -1){
888
exitstatus = EXIT_FAILURE;
891
/* OK, now either a process completed, or something can be read
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
894
/* Is this process completely done? */
895
if(proc->eof and proc->completed){
896
/* Only accept the plugin output if it exited cleanly */
897
if(not WIFEXITED(proc->status)
898
or WEXITSTATUS(proc->status) != 0){
899
/* Bad exit by plugin */
902
if(WIFEXITED(proc->status)){
903
fprintf(stderr, "Plugin %u exited with status %d\n",
904
(unsigned int) (proc->pid),
905
WEXITSTATUS(proc->status));
906
} else if(WIFSIGNALED(proc->status)) {
907
fprintf(stderr, "Plugin %u killed by signal %d\n",
908
(unsigned int) (proc->pid),
909
WTERMSIG(proc->status));
910
} else if(WCOREDUMP(proc->status)){
911
fprintf(stderr, "Plugin %d dumped core\n",
912
(unsigned int) (proc->pid));
916
/* Remove the plugin */
917
FD_CLR(proc->fd, &rfds_all);
919
/* Block signal while modifying process_list */
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
927
/* We are done modifying process list, so unblock signal */
928
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
931
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
936
if(plugin_list == NULL){
942
/* This process exited nicely, so print its buffer */
944
bool bret = print_out_password(proc->buffer,
945
proc->buffer_length);
947
perror("print_out_password");
948
exitstatus = EXIT_FAILURE;
953
/* This process has not completed. Does it have any output? */
954
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
955
/* This process had nothing to say at this time */
958
/* Before reading, make the process' data buffer large enough */
959
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
960
proc->buffer = realloc(proc->buffer, proc->buffer_size
961
+ (size_t) BUFFER_SIZE);
962
if (proc->buffer == NULL){
964
exitstatus = EXIT_FAILURE;
967
proc->buffer_size += BUFFER_SIZE;
969
/* Read from the process */
970
ret = read(proc->fd, proc->buffer + proc->buffer_length,
973
/* Read error from this process; ignore the error */
980
proc->buffer_length += (size_t) ret;
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
989
/* Fallback if all plugins failed, none are found or an error
992
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
993
char *passwordbuffer = getpass("Password: ");
994
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
996
perror("print_out_password");
997
exitstatus = EXIT_FAILURE;
1001
/* Restore old signal handler */
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1008
if(custom_argv != NULL){
1009
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1019
/* Free the process list and kill the processes */
1020
for(plugin *p = plugin_list; p != NULL; p = p->next){
1023
ret = kill(p->pid, SIGTERM);
1024
if(ret == -1 and errno != ESRCH){
1025
/* Set-uid proccesses might not get closed */
1031
/* Wait for any remaining child processes to terminate */
1035
if(errno != ECHILD){