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 */
45
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(),
41
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
72
#define BUFFER_SIZE 256
74
#define PDIR "/lib/mandos/plugins.d"
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
const char *argp_program_version = "plugin-runner " VERSION;
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
80
typedef struct plugin{
81
char *name; /* can be NULL or any plugin name */
88
/* Variables used for running processes*/
49
92
size_t buffer_size;
50
93
size_t buffer_length;
54
#define BUFFER_SIZE 256
95
volatile sig_atomic_t completed;
100
static plugin *plugin_list = NULL;
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
108
or (p->name and name and (strcmp(p->name, name) == 0))){
112
/* Create a new plugin */
113
plugin *new_plugin = NULL;
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
120
char *copy_name = NULL;
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
125
if(copy_name == NULL){
131
*new_plugin = (plugin){ .name = copy_name,
134
.next = plugin_list };
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
144
new_plugin->argv[0] = copy_name;
145
new_plugin->argv[1] = NULL;
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
150
if(new_plugin->environ == NULL){
152
free(new_plugin->argv);
156
new_plugin->environ[0] = NULL;
158
/* Append the new plugin to the list */
159
plugin_list = new_plugin;
163
/* Helper function for add_argument and add_environment */
164
static bool add_to_char_array(const char *new, char ***array,
166
/* Resize the pointed-to array to hold one more pointer */
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
175
/* Make a copy of the new string */
179
} while(copy == NULL and errno == EINTR);
183
/* Insert the copy */
184
(*array)[*len] = copy;
186
/* Add a new terminating NULL pointer to the last element */
187
(*array)[*len] = NULL;
191
/* Add to a plugin's argument vector */
192
static bool add_argument(plugin *p, const char *arg){
196
return add_to_char_array(arg, &(p->argv), &(p->argc));
199
/* Add to a plugin's environment */
200
static bool add_environment(plugin *p, const char *def, bool replace){
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
224
return add_to_char_array(def, &(p->environ), &(p->envc));
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
232
static int set_cloexec_flag(int fd){
233
int ret = TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
234
/* If reading the flags failed, return error indication now. */
238
/* Store modified flag word in the descriptor. */
239
return TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD, ret | FD_CLOEXEC));
243
/* Mark processes as completed when they exit, and save their exit
245
static void handle_sigchld(__attribute__((unused)) int sig){
246
int old_errno = errno;
248
plugin *proc = plugin_list;
250
pid_t pid = waitpid(-1, &status, WNOHANG);
252
/* Only still running child processes */
257
/* No child processes */
263
/* A child exited, find it in process_list */
264
while(proc != NULL and proc->pid != pid){
268
/* Process not found in process list */
271
proc->status = status;
277
/* Prints out a password to stdout */
278
static bool print_out_password(const char *buffer, size_t length){
280
for(size_t written = 0; written < length; written += (size_t)ret){
281
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
290
/* Removes and free a plugin from the plugin list */
291
static void free_plugin(plugin *plugin_node){
293
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
296
free(plugin_node->argv);
297
for(char **env = plugin_node->environ; *env != NULL; env++){
300
free(plugin_node->environ);
301
free(plugin_node->buffer);
303
/* Removes the plugin from the singly-linked list */
304
if(plugin_node == plugin_list){
305
/* First one - simple */
306
plugin_list = plugin_list->next;
308
/* Second one or later */
309
for(plugin *p = plugin_list; p != NULL; p = p->next){
310
if(p->next == plugin_node){
311
p->next = plugin_node->next;
320
static void free_plugin_list(void){
321
while(plugin_list != NULL){
322
free_plugin(plugin_list);
56
326
int main(int argc, char *argv[]){
57
char plugindir[] = "plugins.d";
58
size_t d_name_len, plugindir_len = sizeof(plugindir)-1;
327
char *plugindir = NULL;
328
char *argfile = NULL;
60
332
struct dirent *dirst;
63
335
int ret, maxfd = 0;
64
process *process_list = NULL;
66
dir = opendir(plugindir);
340
int exitstatus = EXIT_SUCCESS;
341
struct sigaction old_sigchld_action;
342
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
343
.sa_flags = SA_NOCLDSTOP };
344
char **custom_argv = NULL;
347
/* Establish a signal handler */
348
sigemptyset(&sigchld_action.sa_mask);
349
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
352
exitstatus = EXIT_FAILURE;
355
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
358
exitstatus = EXIT_FAILURE;
362
/* The options we understand. */
363
struct argp_option options[] = {
364
{ .name = "global-options", .key = 'g',
365
.arg = "OPTION[,OPTION[,...]]",
366
.doc = "Options passed to all plugins" },
367
{ .name = "global-env", .key = 'G',
369
.doc = "Environment variable passed to all plugins" },
370
{ .name = "options-for", .key = 'o',
371
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
372
.doc = "Options passed only to specified plugin" },
373
{ .name = "env-for", .key = 'E',
374
.arg = "PLUGIN:ENV=value",
375
.doc = "Environment variable passed to specified plugin" },
376
{ .name = "disable", .key = 'd',
378
.doc = "Disable a specific plugin", .group = 1 },
379
{ .name = "enable", .key = 'e',
381
.doc = "Enable a specific plugin", .group = 1 },
382
{ .name = "plugin-dir", .key = 128,
384
.doc = "Specify a different plugin directory", .group = 2 },
385
{ .name = "config-file", .key = 129,
387
.doc = "Specify a different configuration file", .group = 2 },
388
{ .name = "userid", .key = 130,
389
.arg = "ID", .flags = 0,
390
.doc = "User ID the plugins will run as", .group = 3 },
391
{ .name = "groupid", .key = 131,
392
.arg = "ID", .flags = 0,
393
.doc = "Group ID the plugins will run as", .group = 3 },
394
{ .name = "debug", .key = 132,
395
.doc = "Debug mode", .group = 4 },
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
404
case 'g': /* --global-options */
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
411
if(not add_argument(getplugin(NULL), plugin_option)){
412
perror("add_argument");
413
return ARGP_ERR_UNKNOWN;
418
case 'G': /* --global-env */
422
if(not add_environment(getplugin(NULL), arg, true)){
423
perror("add_environment");
426
case 'o': /* --options-for */
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
435
perror("add_argument");
436
return ARGP_ERR_UNKNOWN;
441
case 'E': /* --env-for */
446
char *envdef = strchr(arg, ':');
451
if(not add_environment(getplugin(arg), envdef+1, true)){
452
perror("add_environment");
456
case 'd': /* --disable */
458
plugin *p = getplugin(arg);
460
return ARGP_ERR_UNKNOWN;
465
case 'e': /* --enable */
467
plugin *p = getplugin(arg);
469
return ARGP_ERR_UNKNOWN;
474
case 128: /* --plugin-dir */
476
plugindir = strdup(arg);
477
if(plugindir == NULL){
481
case 129: /* --config-file */
482
/* This is already done by parse_opt_config_file() */
484
case 130: /* --userid */
486
tmpmax = strtoimax(arg, &tmp, 10);
487
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
490
PRIdMAX "\n", arg, (intmax_t)uid);
495
case 131: /* --groupid */
497
tmpmax = strtoimax(arg, &tmp, 10);
498
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
506
case 132: /* --debug */
510
* When adding more options before this line, remember to also add a
511
* "case" to the "parse_opt_config_file" function below.
514
/* Cryptsetup always passes an argument, which is an empty
515
string if "none" was specified in /etc/crypttab. So if
516
argument was empty, we ignore it silently. */
518
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
524
return ARGP_ERR_UNKNOWN;
529
/* This option parser is the same as parse_opt() above, except it
530
ignores everything but the --config-file option. */
531
error_t parse_opt_config_file(int key, char *arg,
532
__attribute__((unused))
533
struct argp_state *state){
535
case 'g': /* --global-options */
536
case 'G': /* --global-env */
537
case 'o': /* --options-for */
538
case 'E': /* --env-for */
539
case 'd': /* --disable */
540
case 'e': /* --enable */
541
case 128: /* --plugin-dir */
543
case 129: /* --config-file */
545
argfile = strdup(arg);
550
case 130: /* --userid */
551
case 131: /* --groupid */
552
case 132: /* --debug */
557
return ARGP_ERR_UNKNOWN;
562
struct argp argp = { .options = options,
563
.parser = parse_opt_config_file,
565
.doc = "Mandos plugin runner -- Run plugins" };
567
/* Parse using parse_opt_config_file() in order to get the custom
568
config file location, if any. */
569
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
570
if(ret == ARGP_ERR_UNKNOWN){
571
fprintf(stderr, "Unknown error while parsing arguments\n");
572
exitstatus = EXIT_FAILURE;
576
/* Reset to the normal argument parser */
577
argp.parser = parse_opt;
579
/* Open the configfile if available */
581
conffp = fopen(AFILE, "r");
583
conffp = fopen(argfile, "r");
586
char *org_line = NULL;
587
char *p, *arg, *new_arg, *line;
589
const char whitespace_delims[] = " \r\t\f\v\n";
590
const char comment_delim[] = "#";
593
custom_argv = malloc(sizeof(char*) * 2);
594
if(custom_argv == NULL){
596
exitstatus = EXIT_FAILURE;
599
custom_argv[0] = argv[0];
600
custom_argv[1] = NULL;
602
/* for each line in the config file, strip whitespace and ignore
605
sret = getline(&org_line, &size, conffp);
611
arg = strsep(&line, comment_delim);
612
while((p = strsep(&arg, whitespace_delims)) != NULL){
619
exitstatus = EXIT_FAILURE;
625
custom_argv = realloc(custom_argv, sizeof(char *)
626
* ((unsigned int) custom_argc + 1));
627
if(custom_argv == NULL){
629
exitstatus = EXIT_FAILURE;
633
custom_argv[custom_argc-1] = new_arg;
634
custom_argv[custom_argc] = NULL;
638
ret = fclose(conffp);
639
} while(ret == EOF and errno == EINTR);
642
exitstatus = EXIT_FAILURE;
647
/* Check for harmful errors and go to fallback. Other errors might
648
not affect opening plugins */
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
651
exitstatus = EXIT_FAILURE;
655
/* If there was any arguments from configuration file,
656
pass them to parser as command arguments */
657
if(custom_argv != NULL){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
if(ret == ARGP_ERR_UNKNOWN){
661
fprintf(stderr, "Unknown error while parsing arguments\n");
662
exitstatus = EXIT_FAILURE;
667
/* Parse actual command line arguments, to let them override the
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
671
fprintf(stderr, "Unknown error while parsing arguments\n");
672
exitstatus = EXIT_FAILURE;
677
for(plugin *p = plugin_list; p != NULL; p=p->next){
678
fprintf(stderr, "Plugin: %s has %d arguments\n",
679
p->name ? p->name : "Global", p->argc - 1);
680
for(char **a = p->argv; *a != NULL; a++){
681
fprintf(stderr, "\tArg: %s\n", *a);
683
fprintf(stderr, "...and %d environment variables\n", p->envc);
684
for(char **a = p->environ; *a != NULL; a++){
685
fprintf(stderr, "\t%s\n", *a);
690
/* Strip permissions down to nobody */
700
if(plugindir == NULL){
703
dir = opendir(plugindir);
69
fprintf(stderr, "Can not open directory\n");
707
perror("Could not open plugin dir");
708
exitstatus = EXIT_FAILURE;
712
/* Set the FD_CLOEXEC flag on the directory, if possible */
714
int dir_fd = dirfd(dir);
716
ret = set_cloexec_flag(dir_fd);
718
perror("set_cloexec_flag");
719
exitstatus = EXIT_FAILURE;
727
/* Read and execute any executable in the plugin directory*/
730
dirst = readdir(dir);
731
} while(dirst == NULL and errno == EINTR);
78
// All directory entries have been processed
733
/* All directory entries have been processed */
79
734
if(dirst == NULL){
737
exitstatus = EXIT_FAILURE;
83
743
d_name_len = strlen(dirst->d_name);
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 */
745
/* Ignore dotfiles, backup files and other junk */
747
bool bad_name = false;
749
const char const *bad_prefixes[] = { ".", "#", NULL };
751
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
754
".dpkg-divert", NULL };
755
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
756
size_t pre_len = strlen(*pre);
757
if((d_name_len >= pre_len)
758
and strncmp((dirst->d_name), *pre, pre_len) == 0){
760
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
761
" with bad prefix %s\n", dirst->d_name, *pre);
770
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
771
size_t suf_len = strlen(*suf);
772
if((d_name_len >= suf_len)
773
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
776
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
777
" with bad suffix %s\n", dirst->d_name, *suf);
790
if(plugindir == NULL){
791
ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
809
/* Ignore non-executable files */
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
813
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
814
" with bad type or mode\n", filename);
820
plugin *p = getplugin(dirst->d_name);
828
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
835
/* Add global arguments to argument list for this plugin */
836
plugin *g = getplugin(NULL);
838
for(char **a = g->argv + 1; *a != NULL; a++){
839
if(not add_argument(p, *a)){
840
perror("add_argument");
843
/* Add global environment variables */
844
for(char **e = g->environ; *e != NULL; e++){
845
if(not add_environment(p, *e, false)){
846
perror("add_environment");
851
/* If this plugin has any environment variables, we will call
852
using execve and need to duplicate the environment from this
854
if(p->environ[0] != NULL){
855
for(char **e = environ; *e != NULL; e++){
856
if(not add_environment(p, *e, false)){
857
perror("add_environment");
863
ret = TEMP_FAILURE_RETRY(pipe(pipefd));
866
exitstatus = EXIT_FAILURE;
869
/* Ask OS to automatic close the pipe on exec */
870
ret = set_cloexec_flag(pipefd[0]);
872
perror("set_cloexec_flag");
873
exitstatus = EXIT_FAILURE;
876
ret = set_cloexec_flag(pipefd[1]);
878
perror("set_cloexec_flag");
879
exitstatus = EXIT_FAILURE;
882
/* Block SIGCHLD until process is safely in process list */
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
887
perror("sigprocmask");
888
exitstatus = EXIT_FAILURE;
891
/* Starting a new process to be watched */
895
} while(pid == -1 and errno == EINTR);
898
exitstatus = EXIT_FAILURE;
902
/* this is the child process */
903
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
perror("sigprocmask");
914
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
921
/* If dir has no file descriptor, we could not set FD_CLOEXEC
922
above and must now close it manually here. */
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;
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);
925
if(p->environ[0] == NULL){
926
if(execv(filename, p->argv) < 0){
931
if(execve(filename, p->argv, p->environ) < 0){
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
plugin *new_plugin = getplugin(dirst->d_name);
943
if(new_plugin == NULL){
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
949
perror("sigprocmask");
951
exitstatus = EXIT_FAILURE;
955
new_plugin->pid = pid;
956
new_plugin->fd = pipefd[0];
958
/* Unblock SIGCHLD so signal handler can be run if this process
959
has already completed */
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
964
perror("sigprocmask");
965
exitstatus = EXIT_FAILURE;
969
FD_SET(new_plugin->fd, &rfds_all);
971
if(maxfd < new_plugin->fd){
972
maxfd = new_plugin->fd;
976
TEMP_FAILURE_RETRY(closedir(dir));
978
free_plugin(getplugin(NULL));
980
for(plugin *p = plugin_list; p != NULL; p = p->next){
985
fprintf(stderr, "No plugin processes started. Incorrect plugin"
991
/* Main loop while running plugins exist */
993
fd_set rfds = rfds_all;
994
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
995
if(select_ret == -1 and errno != EINTR){
997
exitstatus = EXIT_FAILURE;
1000
/* OK, now either a process completed, or something can be read
1002
for(plugin *proc = plugin_list; proc != NULL;){
1003
/* Is this process completely done? */
1004
if(proc->completed and proc->eof){
1005
/* Only accept the plugin output if it exited cleanly */
1006
if(not WIFEXITED(proc->status)
1007
or WEXITSTATUS(proc->status) != 0){
1008
/* Bad exit by plugin */
1011
if(WIFEXITED(proc->status)){
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
1015
WEXITSTATUS(proc->status));
1016
} else if(WIFSIGNALED(proc->status)){
1017
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1018
" signal %d: %s\n", proc->name,
1019
(intmax_t) (proc->pid),
1020
WTERMSIG(proc->status),
1021
strsignal(WTERMSIG(proc->status)));
1022
} else if(WCOREDUMP(proc->status)){
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
1028
/* Remove the plugin */
1029
FD_CLR(proc->fd, &rfds_all);
1031
/* Block signal while modifying process_list */
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
1036
perror("sigprocmask");
1037
exitstatus = EXIT_FAILURE;
1041
plugin *next_plugin = proc->next;
1045
/* We are done modifying process list, so unblock signal */
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
1050
perror("sigprocmask");
1051
exitstatus = EXIT_FAILURE;
1055
if(plugin_list == NULL){
1062
/* This process exited nicely, so print its buffer */
1064
bool bret = print_out_password(proc->buffer,
1065
proc->buffer_length);
1067
perror("print_out_password");
1068
exitstatus = EXIT_FAILURE;
1073
/* This process has not completed. Does it have any output? */
1074
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1075
/* This process had nothing to say at this time */
1079
/* Before reading, make the process' data buffer large enough */
1080
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1081
proc->buffer = realloc(proc->buffer, proc->buffer_size
1082
+ (size_t) BUFFER_SIZE);
1083
if(proc->buffer == NULL){
1085
exitstatus = EXIT_FAILURE;
1088
proc->buffer_size += BUFFER_SIZE;
1090
/* Read from the process */
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1093
+ proc->buffer_length,
1096
/* Read error from this process; ignore the error */
1104
proc->buffer_length += (size_t) sret;
1112
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1113
/* Fallback if all plugins failed, none are found or an error
1116
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1117
char *passwordbuffer = getpass("Password: ");
1118
size_t len = strlen(passwordbuffer);
1119
/* Strip trailing newline */
1120
if(len > 0 and passwordbuffer[len-1] == '\n'){
1121
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1124
bret = print_out_password(passwordbuffer, len);
1126
perror("print_out_password");
1127
exitstatus = EXIT_FAILURE;
1131
/* Restore old signal handler */
1132
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1134
perror("sigaction");
1135
exitstatus = EXIT_FAILURE;
1138
if(custom_argv != NULL){
1139
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1149
/* Kill the processes */
1150
for(plugin *p = plugin_list; p != NULL; p = p->next){
1153
ret = kill(p->pid, SIGTERM);
1154
if(ret == -1 and errno != ESRCH){
1155
/* Set-uid proccesses might not get closed */
1161
/* Wait for any remaining child processes to terminate */
1165
if(errno != ECHILD){