37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
54
#include <string.h> /* strsep, strlen(), strcpy(),
56
#include <string.h> /* strsep, strlen(), asprintf(),
56
58
#include <errno.h> /* errno */
57
59
#include <argp.h> /* struct argp_option, struct
58
60
argp_state, struct argp,
59
61
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
67
73
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
70
const char *argp_program_version = "plugin-runner 1.0";
75
#define PDIR "/lib/mandos/plugins.d"
76
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
const char *argp_program_version = "plugin-runner " VERSION;
71
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
typedef struct process{
81
typedef struct plugin{
82
char *name; /* can be NULL or any plugin name */
89
/* Variables used for running processes*/
79
93
size_t buffer_size;
80
94
size_t buffer_length;
96
volatile sig_atomic_t completed;
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
92
98
struct plugin *next;
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
or (p->name and name and (strcmp(p->name, name) == 0))){
101
static plugin *plugin_list = NULL;
103
/* Gets an existing plugin based on name,
104
or if none is found, creates a new one */
105
static plugin *getplugin(char *name){
106
/* Check for existing plugin with that name */
107
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
or (p->name and name and (strcmp(p->name, name) == 0))){
102
113
/* Create a new plugin */
103
plugin *new_plugin = malloc(sizeof(plugin));
104
if (new_plugin == NULL){
108
new_plugin->name = name;
109
new_plugin->argv = malloc(sizeof(char *) * 2);
110
if (new_plugin->argv == NULL){
114
new_plugin->argv[0] = name;
114
plugin *new_plugin = NULL;
116
new_plugin = malloc(sizeof(plugin));
117
} while(new_plugin == NULL and errno == EINTR);
118
if(new_plugin == NULL){
121
char *copy_name = NULL;
124
copy_name = strdup(name);
125
} while(copy_name == NULL and errno == EINTR);
126
if(copy_name == NULL){
134
*new_plugin = (plugin){ .name = copy_name,
137
.next = plugin_list };
140
new_plugin->argv = malloc(sizeof(char *) * 2);
141
} while(new_plugin->argv == NULL and errno == EINTR);
142
if(new_plugin->argv == NULL){
149
new_plugin->argv[0] = copy_name;
115
150
new_plugin->argv[1] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
153
new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
155
if(new_plugin->environ == NULL){
158
free(new_plugin->argv);
163
new_plugin->environ[0] = NULL;
119
165
/* Append the new plugin to the list */
120
*plugin_list = new_plugin;
166
plugin_list = new_plugin;
121
167
return new_plugin;
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
132
p->argv[p->argc] = NULL;
170
/* Helper function for add_argument and add_environment */
171
static bool add_to_char_array(const char *new, char ***array,
173
/* Resize the pointed-to array to hold one more pointer */
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
182
/* Make a copy of the new string */
186
} while(copy == NULL and errno == EINTR);
190
/* Insert the copy */
191
(*array)[*len] = copy;
193
/* Add a new terminating NULL pointer to the last element */
194
(*array)[*len] = NULL;
198
/* Add to a plugin's argument vector */
199
static bool add_argument(plugin *p, const char *arg){
203
return add_to_char_array(arg, &(p->argv), &(p->argc));
206
/* Add to a plugin's environment */
207
static bool add_environment(plugin *p, const char *def, bool replace){
211
/* namelen = length of name of environment variable */
212
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
216
/* It already exists */
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
231
return add_to_char_array(def, &(p->environ), &(p->envc));
136
235
* Based on the example in the GNU LibC manual chapter 13.13 "File
137
236
* Descriptor Flags".
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
237
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
140
static int set_cloexec_flag(int fd)
142
int ret = fcntl(fd, F_GETFD, 0);
239
static int set_cloexec_flag(int fd){
240
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
143
241
/* If reading the flags failed, return error indication now. */
147
245
/* Store modified flag word in the descriptor. */
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
246
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
151
process *process_list = NULL;
153
/* Mark a process as completed when it exits, and save its exit
251
/* Mark processes as completed when they exit, and save their exit
155
void handle_sigchld(__attribute__((unused)) int sig){
156
process *proc = process_list;
158
pid_t pid = wait(&status);
163
while(proc != NULL and proc->pid != pid){
167
/* Process not found in process list */
170
proc->status = status;
171
proc->completed = true;
253
static void handle_sigchld(__attribute__((unused)) int sig){
254
int old_errno = errno;
256
plugin *proc = plugin_list;
258
pid_t pid = waitpid(-1, &status, WNOHANG);
260
/* Only still running child processes */
265
/* No child processes */
271
/* A child exited, find it in process_list */
272
while(proc != NULL and proc->pid != pid){
276
/* Process not found in process list */
279
proc->status = status;
174
bool print_out_password(const char *buffer, size_t length){
285
/* Prints out a password to stdout */
286
static bool print_out_password(const char *buffer, size_t length){
176
if(length>0 and buffer[length-1] == '\n'){
179
288
for(size_t written = 0; written < length; written += (size_t)ret){
180
289
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
181
290
length - written));
246
372
{ .name = "global-options", .key = 'g',
247
373
.arg = "OPTION[,OPTION[,...]]",
248
374
.doc = "Options passed to all plugins" },
375
{ .name = "global-env", .key = 'G',
377
.doc = "Environment variable passed to all plugins" },
249
378
{ .name = "options-for", .key = 'o',
250
379
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
251
380
.doc = "Options passed only to specified plugin" },
381
{ .name = "env-for", .key = 'E',
382
.arg = "PLUGIN:ENV=value",
383
.doc = "Environment variable passed to specified plugin" },
252
384
{ .name = "disable", .key = 'd',
254
386
.doc = "Disable a specific plugin", .group = 1 },
387
{ .name = "enable", .key = 'e',
389
.doc = "Enable a specific plugin", .group = 1 },
255
390
{ .name = "plugin-dir", .key = 128,
256
391
.arg = "DIRECTORY",
257
392
.doc = "Specify a different plugin directory", .group = 2 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
393
{ .name = "config-file", .key = 129,
395
.doc = "Specify a different configuration file", .group = 2 },
396
{ .name = "userid", .key = 130,
397
.arg = "ID", .flags = 0,
398
.doc = "User ID the plugins will run as", .group = 3 },
399
{ .name = "groupid", .key = 131,
400
.arg = "ID", .flags = 0,
401
.doc = "Group ID the plugins will run as", .group = 3 },
402
{ .name = "debug", .key = 132,
403
.doc = "Debug mode", .group = 4 },
405
* These reproduce what we would get without ARGP_NO_HELP
407
{ .name = "help", .key = '?',
408
.doc = "Give this help list", .group = -1 },
409
{ .name = "usage", .key = -3,
410
.doc = "Give a short usage message", .group = -1 },
411
{ .name = "version", .key = 'V',
412
.doc = "Print program version", .group = -1 },
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
277
while((p = strsep(&arg, ",")) != NULL){
281
addargument(getplugin(NULL, plugins), p);
287
char *name = strsep(&arg, ":");
291
char *opt = strsep(&arg, ":");
297
while((p = strsep(&opt, ",")) != NULL){
301
addargument(getplugin(name, plugins), p);
308
getplugin(arg, plugins)->disabled = true;
315
uid = (uid_t)strtol(arg, NULL, 10);
318
gid = (gid_t)strtol(arg, NULL, 10);
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
421
case 'g': /* --global-options */
424
while((plugin_option = strsep(&arg, ",")) != NULL){
425
if(not add_argument(getplugin(NULL), plugin_option)){
431
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
434
case 'o': /* --options-for */
436
char *option_list = strchr(arg, ':');
437
if(option_list == NULL){
438
argp_error(state, "No colon in \"%s\"", arg);
445
argp_error(state, "Empty plugin name");
450
while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
457
case 'E': /* --env-for */
459
char *envdef = strchr(arg, ':');
461
argp_error(state, "No colon in \"%s\"", arg);
468
argp_error(state, "Empty plugin name");
472
add_environment(getplugin(arg), envdef, true);
475
case 'd': /* --disable */
477
plugin *p = getplugin(arg);
483
case 'e': /* --enable */
485
plugin *p = getplugin(arg);
491
case 128: /* --plugin-dir */
493
plugindir = strdup(arg);
495
case 129: /* --config-file */
496
/* This is already done by parse_opt_config_file() */
498
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
500
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
502
argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
508
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
510
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
512
argp_error(state, "Bad group ID number: \"%s\", using %"
513
PRIdMAX, arg, (intmax_t)gid);
518
case 132: /* --debug */
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
329
return ARGP_ERR_UNKNOWN;
334
plugin *plugin_list = NULL;
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
522
* These reproduce what we would get without ARGP_NO_HELP
524
case '?': /* --help */
525
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
527
case -3: /* --usage */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
532
fprintf(state->out_stream, "%s\n", argp_program_version);
536
* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
540
/* Cryptsetup always passes an argument, which is an empty
541
string if "none" was specified in /etc/crypttab. So if
542
argument was empty, we ignore it silently. */
547
return ARGP_ERR_UNKNOWN;
549
return errno; /* Set to 0 at start */
552
/* This option parser is the same as parse_opt() above, except it
553
ignores everything but the --config-file option. */
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
559
case 'g': /* --global-options */
560
case 'G': /* --global-env */
561
case 'o': /* --options-for */
562
case 'E': /* --env-for */
563
case 'd': /* --disable */
564
case 'e': /* --enable */
565
case 128: /* --plugin-dir */
567
case 129: /* --config-file */
569
argfile = strdup(arg);
571
case 130: /* --userid */
572
case 131: /* --groupid */
573
case 132: /* --debug */
574
case '?': /* --help */
575
case -3: /* --usage */
576
case 'V': /* --version */
580
return ARGP_ERR_UNKNOWN;
585
struct argp argp = { .options = options,
586
.parser = parse_opt_config_file,
338
588
.doc = "Mandos plugin runner -- Run plugins" };
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
342
fprintf(stderr, "Unknown error while parsing arguments\n");
343
exitstatus = EXIT_FAILURE;
347
conffp = fopen(argfile, "r");
590
/* Parse using parse_opt_config_file() in order to get the custom
591
config file location, if any. */
592
ret = argp_parse(&argp, argc, argv,
593
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
601
perror("argp_parse");
602
exitstatus = EX_OSERR;
605
exitstatus = EX_USAGE;
609
/* Reset to the normal argument parser */
610
argp.parser = parse_opt;
612
/* Open the configfile if available */
614
conffp = fopen(AFILE, "r");
616
conffp = fopen(argfile, "r");
348
618
if(conffp != NULL){
349
619
char *org_line = NULL;
620
char *p, *arg, *new_arg, *line;
352
char *p, *arg, *new_arg, *line;
353
622
const char whitespace_delims[] = " \r\t\f\v\n";
354
623
const char comment_delim[] = "#";
626
custom_argv = malloc(sizeof(char*) * 2);
627
if(custom_argv == NULL){
629
exitstatus = EXIT_FAILURE;
632
custom_argv[0] = argv[0];
633
custom_argv[1] = NULL;
635
/* for each line in the config file, strip whitespace and ignore
357
638
sret = getline(&org_line, &size, conffp);
363
644
arg = strsep(&line, comment_delim);
364
645
while((p = strsep(&arg, whitespace_delims)) != NULL){
368
649
new_arg = strdup(p);
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
652
exitstatus = EXIT_FAILURE;
658
custom_argv = realloc(custom_argv, sizeof(char *)
659
* ((unsigned int) custom_argc + 1));
660
if(custom_argv == NULL){
662
exitstatus = EXIT_FAILURE;
666
custom_argv[custom_argc-1] = new_arg;
667
custom_argv[custom_argc] = NULL;
671
ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
675
exitstatus = EXIT_FAILURE;
379
680
/* Check for harmful errors and go to fallback. Other errors might
380
681
not affect opening plugins */
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
383
684
exitstatus = EXIT_FAILURE;
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
388
690
if(custom_argv != NULL){
389
custom_argv[0] = argv[0];
390
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
391
if (ret == ARGP_ERR_UNKNOWN){
392
fprintf(stderr, "Unknown error while parsing arguments\n");
393
exitstatus = EXIT_FAILURE;
691
ret = argp_parse(&argp, custom_argc, custom_argv,
692
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
700
perror("argp_parse");
701
exitstatus = EX_OSERR;
704
exitstatus = EX_CONFIG;
709
/* Parse actual command line arguments, to let them override the
711
ret = argp_parse(&argp, argc, argv,
712
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
720
perror("argp_parse");
721
exitstatus = EX_OSERR;
724
exitstatus = EX_USAGE;
399
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
400
730
fprintf(stderr, "Plugin: %s has %d arguments\n",
402
732
for(char **a = p->argv; *a != NULL; a++){
403
733
fprintf(stderr, "\tArg: %s\n", *a);
735
fprintf(stderr, "...and %d environment variables\n", p->envc);
736
for(char **a = p->environ; *a != NULL; a++){
737
fprintf(stderr, "\t%s\n", *a);
742
/* Strip permissions down to nobody */
408
747
ret = setuid(uid);
410
749
perror("setuid");
418
dir = opendir(plugindir);
420
perror("Could not open plugin dir");
421
exitstatus = EXIT_FAILURE;
425
/* Set the FD_CLOEXEC flag on the directory, if possible */
752
/* Open plugin directory with close_on_exec flag */
427
int dir_fd = dirfd(dir);
429
ret = set_cloexec_flag(dir_fd);
431
perror("set_cloexec_flag");
432
exitstatus = EXIT_FAILURE;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
759
#else /* not O_CLOEXEC */
761
#endif /* not O_CLOEXEC */
764
dir_fd = open(plugindir, O_RDONLY |
767
#else /* not O_CLOEXEC */
769
#endif /* not O_CLOEXEC */
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
779
/* Set the FD_CLOEXEC flag on the directory */
780
ret = set_cloexec_flag(dir_fd);
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
787
#endif /* O_CLOEXEC */
789
dir = fdopendir(dir_fd);
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
438
798
FD_ZERO(&rfds_all);
800
/* Read and execute any executable in the plugin directory*/
441
dirst = readdir(dir);
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
443
// All directory entries have been processed
806
/* All directory entries have been processed */
444
807
if(dirst == NULL){
446
809
perror("readdir");
447
810
exitstatus = EXIT_FAILURE;
453
816
d_name_len = strlen(dirst->d_name);
455
// Ignore dotfiles, backup files and other junk
818
/* Ignore dotfiles, backup files and other junk */
457
820
bool bad_name = false;
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
534
909
/* Add global arguments to argument list for this plugin */
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
910
plugin *g = getplugin(NULL);
912
for(char **a = g->argv + 1; *a != NULL; a++){
913
if(not add_argument(p, *a)){
914
perror("add_argument");
917
/* Add global environment variables */
918
for(char **e = g->environ; *e != NULL; e++){
919
if(not add_environment(p, *e, false)){
920
perror("add_environment");
925
/* If this plugin has any environment variables, we will call
926
using execve and need to duplicate the environment from this
928
if(p->environ[0] != NULL){
929
for(char **e = environ; *e != NULL; e++){
930
if(not add_environment(p, *e, false)){
931
perror("add_environment");
937
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
544
940
exitstatus = EXIT_FAILURE;
943
/* Ask OS to automatic close the pipe on exec */
547
944
ret = set_cloexec_flag(pipefd[0]);
549
946
perror("set_cloexec_flag");
550
947
exitstatus = EXIT_FAILURE;
553
950
ret = set_cloexec_flag(pipefd[1]);
555
952
perror("set_cloexec_flag");
556
953
exitstatus = EXIT_FAILURE;
559
956
/* Block SIGCHLD until process is safely in process list */
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
957
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
&sigchld_action.sa_mask,
562
961
perror("sigprocmask");
563
962
exitstatus = EXIT_FAILURE;
566
// Starting a new process to be watched
965
/* Starting a new process to be watched */
969
} while(pid == -1 and errno == EINTR);
570
972
exitstatus = EXIT_FAILURE;
574
976
/* this is the child process */
594
996
above and must now close it manually here. */
597
if(execv(filename, p->argv) < 0){
999
if(p->environ[0] == NULL){
1000
if(execv(filename, p->argv) < 0){
1002
_exit(EXIT_FAILURE);
1005
if(execve(filename, p->argv, p->environ) < 0){
1007
_exit(EXIT_FAILURE);
1012
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
605
close(pipefd[1]); /* close unused write end of pipe */
606
process *new_process = malloc(sizeof(process));
607
if (new_process == NULL){
609
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1016
plugin *new_plugin = getplugin(dirst->d_name);
1017
if(new_plugin == NULL){
1018
perror("getplugin");
1019
ret = (int)(TEMP_FAILURE_RETRY
1020
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
611
perror("sigprocmask");
1023
perror("sigprocmask");
613
1025
exitstatus = EXIT_FAILURE;
617
*new_process = (struct process){ .pid = pid,
619
.next = process_list };
621
process_list = new_process;
1029
new_plugin->pid = pid;
1030
new_plugin->fd = pipefd[0];
622
1032
/* Unblock SIGCHLD so signal handler can be run if this process
623
1033
has already completed */
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
&sigchld_action.sa_mask,
626
1038
perror("sigprocmask");
627
1039
exitstatus = EXIT_FAILURE;
631
FD_SET(new_process->fd, &rfds_all);
633
if (maxfd < new_process->fd){
634
maxfd = new_process->fd;
639
/* Free the plugin list */
640
for(plugin *next; plugin_list != NULL; plugin_list = next){
641
next = plugin_list->next;
642
free(plugin_list->argv);
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1046
if(maxfd < new_plugin->fd){
1047
maxfd = new_plugin->fd;
1051
TEMP_FAILURE_RETRY(closedir(dir));
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1053
free_plugin(getplugin(NULL));
1055
for(plugin *p = plugin_list; p != NULL; p = p->next){
1059
if(p->next == NULL){
1060
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1066
/* Main loop while running plugins exist */
655
1068
fd_set rfds = rfds_all;
656
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
657
if (select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
658
1071
perror("select");
659
1072
exitstatus = EXIT_FAILURE;
662
1075
/* OK, now either a process completed, or something can be read
663
1076
from one of them */
664
for(process *proc = process_list; proc ; proc = proc->next){
1077
for(plugin *proc = plugin_list; proc != NULL;){
665
1078
/* Is this process completely done? */
666
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
667
1080
/* Only accept the plugin output if it exited cleanly */
668
1081
if(not WIFEXITED(proc->status)
669
1082
or WEXITSTATUS(proc->status) != 0){
670
1083
/* Bad exit by plugin */
672
1086
if(WIFEXITED(proc->status)){
673
fprintf(stderr, "Plugin %u exited with status %d\n",
674
(unsigned int) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
675
1090
WEXITSTATUS(proc->status));
676
} else if(WIFSIGNALED(proc->status)) {
677
fprintf(stderr, "Plugin %u killed by signal %d\n",
678
(unsigned int) (proc->pid),
679
WTERMSIG(proc->status));
1091
} else if(WIFSIGNALED(proc->status)){
1092
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1093
" signal %d: %s\n", proc->name,
1094
(intmax_t) (proc->pid),
1095
WTERMSIG(proc->status),
1096
strsignal(WTERMSIG(proc->status)));
680
1097
} else if(WCOREDUMP(proc->status)){
681
fprintf(stderr, "Plugin %d dumped core\n",
682
(unsigned int) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
685
1103
/* Remove the plugin */
686
FD_CLR(proc->fd, &rfds_all);
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
687
1107
/* Block signal while modifying process_list */
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
&sigchld_action.sa_mask,
690
1113
perror("sigprocmask");
691
1114
exitstatus = EXIT_FAILURE;
694
/* Delete this process entry from the list */
695
if(process_list == proc){
696
/* First one - simple */
697
process_list = proc->next;
699
/* Second one or later */
700
for(process *p = process_list; p != NULL; p = p->next){
702
p->next = proc->next;
1118
plugin *next_plugin = proc->next;
707
1122
/* We are done modifying process list, so unblock signal */
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
711
1127
perror("sigprocmask");
715
/* We deleted this process from the list, so we can't go
716
proc->next. Therefore, start over from the beginning of
1128
exitstatus = EXIT_FAILURE;
1132
if(plugin_list == NULL){
720
1139
/* This process exited nicely, so print its buffer */
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1141
bool bret = print_out_password(proc->buffer,
1142
proc->buffer_length);
724
1144
perror("print_out_password");
725
1145
exitstatus = EXIT_FAILURE;
729
1150
/* This process has not completed. Does it have any output? */
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
731
1154
/* This process had nothing to say at this time */
734
1158
/* Before reading, make the process' data buffer large enough */
735
1159
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
736
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
737
1161
+ (size_t) BUFFER_SIZE);
738
if (proc->buffer == NULL){
1162
if(proc->buffer == NULL){
739
1163
perror("malloc");
740
1164
exitstatus = EXIT_FAILURE;
743
1167
proc->buffer_size += BUFFER_SIZE;
745
1169
/* Read from the process */
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1170
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
+ proc->buffer_length,
749
1175
/* Read error from this process; ignore the error */
754
1181
proc->eof = true;
756
proc->buffer_length += (size_t) ret;
1183
proc->buffer_length += (size_t) sret;
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1192
/* Fallback if all plugins failed, none are found or an error
767
1195
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
768
1196
char *passwordbuffer = getpass("Password: ");
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1197
size_t len = strlen(passwordbuffer);
1198
/* Strip trailing newline */
1199
if(len > 0 and passwordbuffer[len-1] == '\n'){
1200
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
bret = print_out_password(passwordbuffer, len);
771
1205
perror("print_out_password");
772
1206
exitstatus = EXIT_FAILURE;
777
1210
/* Restore old signal handler */
778
sigaction(SIGCHLD, &old_sigchld_action, NULL);
782
/* Free the plugin list */
783
for(plugin *next; plugin_list != NULL; plugin_list = next){
784
next = plugin_list->next;
785
free(plugin_list->argv);
1211
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1217
if(custom_argv != NULL){
1218
for(char **arg = custom_argv+1; *arg != NULL; arg++){
789
1224
if(dir != NULL){
793
/* Free the process list and kill the processes */
794
for(process *next; process_list != NULL; process_list = next){
795
next = process_list->next;
796
close(process_list->fd);
797
ret = kill(process_list->pid, SIGTERM);
798
if(ret == -1 and errno != ESRCH){
799
/* set-uid proccesses migth not get closed */
1228
/* Kill the processes */
1229
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
ret = kill(p->pid, SIGTERM);
1233
if(ret == -1 and errno != ESRCH){
1234
/* Set-uid proccesses might not get closed */
802
free(process_list->buffer);
806
1240
/* Wait for any remaining child processes to terminate */
808
1242
ret = wait(NULL);
809
1243
} while(ret >= 0);
810
1244
if(errno != ECHILD){
814
1253
return exitstatus;