38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
54
#include <string.h> /* strsep, strlen(), strcpy(),
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
61
59
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
64
SIG_UNBLOCK, kill() */
69
65
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
76
67
#define BUFFER_SIZE 256
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
typedef struct plugin{
85
char *name; /* can be NULL or any plugin name */
92
/* Variables used for running processes*/
68
#define ARGFILE "/conf/conf.d/mandos/plugins.conf"
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
75
typedef struct process{
96
79
size_t buffer_size;
97
80
size_t buffer_length;
99
volatile sig_atomic_t completed;
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
101
92
struct plugin *next;
104
static plugin *plugin_list = NULL;
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
116
102
/* Create a new plugin */
117
plugin *new_plugin = NULL;
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
124
char *copy_name = NULL;
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
129
if(copy_name == NULL){
137
*new_plugin = (plugin){ .name = copy_name,
140
.next = plugin_list };
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
152
new_plugin->argv[0] = copy_name;
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;
153
115
new_plugin->argv[1] = NULL;
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
158
if(new_plugin->environ == NULL){
161
free(new_plugin->argv);
166
new_plugin->environ[0] = NULL;
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
168
119
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
120
*plugin_list = new_plugin;
170
121
return new_plugin;
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
175
static bool add_to_char_array(const char *new, char ***array,
177
/* Resize the pointed-to array to hold one more pointer */
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
186
/* Make a copy of the new string */
190
} while(copy == NULL and errno == EINTR);
194
/* Insert the copy */
195
(*array)[*len] = copy;
197
/* Add a new terminating NULL pointer to the last element */
198
(*array)[*len] = NULL;
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
204
static bool add_argument(plugin *p, const char *arg){
208
return add_to_char_array(arg, &(p->argv), &(p->argc));
211
/* Add to a plugin's environment */
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
237
return add_to_char_array(def, &(p->environ), &(p->envc));
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;
241
136
* Based on the example in the GNU LibC manual chapter 13.13 "File
242
137
* Descriptor Flags".
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
138
* *Note File Descriptor Flags:(libc)Descriptor Flags.
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
140
static int set_cloexec_flag(int fd)
142
int ret = fcntl(fd, F_GETFD, 0);
247
143
/* If reading the flags failed, return error indication now. */
251
147
/* Store modified flag word in the descriptor. */
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
151
process *process_list = NULL;
257
/* Mark processes as completed when they exit, and save their exit
153
/* Mark a process as completed when it exits, and save its exit
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
262
plugin *proc = plugin_list;
264
pid_t pid = waitpid(-1, &status, WNOHANG);
266
/* Only still running child processes */
271
/* No child processes */
274
error(0, errno, "waitpid");
277
/* A child exited, find it in process_list */
278
while(proc != NULL and proc->pid != pid){
282
/* Process not found in process list */
285
proc->status = status;
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;
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
174
bool print_out_password(const char *buffer, size_t length){
176
if(length>0 and buffer[length-1] == '\n'){
295
179
for(size_t written = 0; written < length; written += (size_t)ret){
296
180
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
297
181
length - written));
380
246
{ .name = "global-options", .key = 'g',
381
247
.arg = "OPTION[,OPTION[,...]]",
382
248
.doc = "Options passed to all plugins" },
383
{ .name = "global-env", .key = 'G',
385
.doc = "Environment variable passed to all plugins" },
386
249
{ .name = "options-for", .key = 'o',
387
250
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
388
251
.doc = "Options passed only to specified plugin" },
389
{ .name = "env-for", .key = 'E',
390
.arg = "PLUGIN:ENV=value",
391
.doc = "Environment variable passed to specified plugin" },
392
252
{ .name = "disable", .key = 'd',
394
254
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
397
.doc = "Enable a specific plugin", .group = 1 },
398
255
{ .name = "plugin-dir", .key = 128,
399
256
.arg = "DIRECTORY",
400
257
.doc = "Specify a different plugin directory", .group = 2 },
401
{ .name = "config-file", .key = 129,
403
.doc = "Specify a different configuration file", .group = 2 },
404
{ .name = "userid", .key = 130,
405
.arg = "ID", .flags = 0,
406
.doc = "User ID the plugins will run as", .group = 3 },
407
{ .name = "groupid", .key = 131,
408
.arg = "ID", .flags = 0,
409
.doc = "Group ID the plugins will run as", .group = 3 },
410
{ .name = "debug", .key = 132,
411
.doc = "Debug mode", .group = 4 },
413
* These reproduce what we would get without ARGP_NO_HELP
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
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 },
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
430
case 'g': /* --global-options */
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
443
case 'o': /* --options-for */
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
454
argp_error(state, "Empty plugin name");
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
466
case 'E': /* --env-for */
468
char *envdef = strchr(arg, ':');
470
argp_error(state, "No colon in \"%s\"", arg);
477
argp_error(state, "Empty plugin name");
481
add_environment(getplugin(arg), envdef, true);
484
case 'd': /* --disable */
486
plugin *p = getplugin(arg);
492
case 'e': /* --enable */
494
plugin *p = getplugin(arg);
500
case 128: /* --plugin-dir */
502
plugindir = strdup(arg);
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
507
case 130: /* --userid */
508
tmpmax = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmpmax != (uid_t)tmpmax){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
517
case 131: /* --groupid */
518
tmpmax = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmpmax != (gid_t)tmpmax){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
527
case 132: /* --debug */
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);
531
* These reproduce what we would get without ARGP_NO_HELP
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
556
return ARGP_ERR_UNKNOWN;
558
return errno; /* Set to 0 at start */
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
576
case 129: /* --config-file */
578
argfile = strdup(arg);
580
case 130: /* --userid */
581
case 131: /* --groupid */
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
589
return ARGP_ERR_UNKNOWN;
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
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]",
597
338
.doc = "Mandos plugin runner -- Run plugins" };
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
614
exitstatus = EX_USAGE;
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
621
/* Open the configfile if available */
623
conffp = fopen(AFILE, "r");
625
conffp = fopen(argfile, "r");
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");
627
348
if(conffp != NULL){
628
349
char *org_line = NULL;
629
352
char *p, *arg, *new_arg, *line;
631
353
const char whitespace_delims[] = " \r\t\f\v\n";
632
354
const char comment_delim[] = "#";
635
custom_argv = malloc(sizeof(char*) * 2);
636
if(custom_argv == NULL){
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
641
custom_argv[0] = argv[0];
642
custom_argv[1] = NULL;
644
/* for each line in the config file, strip whitespace and ignore
647
357
sret = getline(&org_line, &size, conffp);
653
363
arg = strsep(&line, comment_delim);
654
364
while((p = strsep(&arg, whitespace_delims)) != NULL){
658
368
new_arg = strdup(p);
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
667
custom_argv = realloc(custom_argv, sizeof(char *)
668
* ((unsigned int) custom_argc + 1));
669
if(custom_argv == NULL){
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
675
custom_argv[custom_argc-1] = new_arg;
676
custom_argv[custom_argc] = NULL;
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
689
379
/* Check for harmful errors and go to fallback. Other errors might
690
380
not affect opening plugins */
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
381
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
383
exitstatus = EXIT_FAILURE;
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
699
388
if(custom_argv != NULL){
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
713
exitstatus = EX_CONFIG;
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;
718
/* Parse actual command line arguments, to let them override the
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
733
exitstatus = EX_USAGE;
738
399
for(plugin *p = plugin_list; p != NULL; p=p->next){
739
400
fprintf(stderr, "Plugin: %s has %d arguments\n",
741
402
for(char **a = p->argv; *a != NULL; a++){
742
403
fprintf(stderr, "\tArg: %s\n", *a);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
745
for(char **a = p->environ; *a != NULL; a++){
746
fprintf(stderr, "\t%s\n", *a);
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
760
error(0, errno, "fstat");
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
765
error(0, errno, "fchown");
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
773
/* Lower permissions */
776
error(0, errno, "setgid");
780
error(0, errno, "setuid");
783
/* Open plugin directory with close_on_exec flag */
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 */
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
790
#else /* not O_CLOEXEC */
792
#endif /* not O_CLOEXEC */
795
dir_fd = open(plugindir, O_RDONLY |
798
#else /* not O_CLOEXEC */
800
#endif /* not O_CLOEXEC */
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
818
#endif /* O_CLOEXEC */
820
dir = fdopendir(dir_fd);
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
427
int dir_fd = dirfd(dir);
429
ret = set_cloexec_flag(dir_fd);
431
perror("set_cloexec_flag");
432
exitstatus = EXIT_FAILURE;
829
438
FD_ZERO(&rfds_all);
831
/* Read and execute any executable in the plugin directory*/
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
441
dirst = readdir(dir);
837
/* All directory entries have been processed */
443
// All directory entries have been processed
838
444
if(dirst == NULL){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
447
exitstatus = EXIT_FAILURE;
847
453
d_name_len = strlen(dirst->d_name);
849
/* Ignore dotfiles, backup files and other junk */
455
// Ignore dotfiles, backup files and other junk
851
457
bool bad_name = false;
532
plugin *p = getplugin(dirst->d_name, &plugin_list);
940
534
/* Add global arguments to argument list for this plugin */
941
plugin *g = getplugin(NULL);
943
for(char **a = g->argv + 1; *a != NULL; a++){
944
if(not add_argument(p, *a)){
945
error(0, errno, "add_argument");
948
/* Add global environment variables */
949
for(char **e = g->environ; *e != NULL; e++){
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
956
/* If this plugin has any environment variables, we will call
957
using execve and need to duplicate the environment from this
959
if(p->environ[0] != NULL){
960
for(char **e = environ; *e != NULL; e++){
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
974
/* Ask OS to automatic close the pipe on exec */
535
plugin *g = getplugin(NULL, &plugin_list);
536
for(char **a = g->argv + 1; *a != NULL; a++){
544
exitstatus = EXIT_FAILURE;
975
547
ret = set_cloexec_flag(pipefd[0]);
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
549
perror("set_cloexec_flag");
550
exitstatus = EXIT_FAILURE;
981
553
ret = set_cloexec_flag(pipefd[1]);
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
555
perror("set_cloexec_flag");
556
exitstatus = EXIT_FAILURE;
987
559
/* Block SIGCHLD until process is safely in process list */
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
560
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
562
perror("sigprocmask");
563
exitstatus = EXIT_FAILURE;
996
/* Starting a new process to be watched */
1000
} while(pid == -1 and errno == EINTR);
566
// Starting a new process to be watched
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
570
exitstatus = EXIT_FAILURE;
1007
574
/* this is the child process */
1008
575
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1010
error(0, errno, "sigaction");
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1015
error(0, errno, "sigprocmask");
582
perror("sigprocmask");
1019
586
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1021
error(0, errno, "dup2");
1025
592
if(dirfd(dir) < 0){
1027
594
above and must now close it manually here. */
1030
if(p->environ[0] == NULL){
1031
if(execv(filename, p->argv) < 0){
1032
error(0, errno, "execv for %s", filename);
1036
if(execve(filename, p->argv, p->environ) < 0){
1037
error(0, errno, "execve for %s", filename);
597
if(execv(filename, p->argv) < 0){
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1047
plugin *new_plugin = getplugin(dirst->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
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);
1054
error(0, errno, "sigprocmask");
611
perror("sigprocmask");
1056
exitstatus = EX_OSERR;
613
exitstatus = EXIT_FAILURE;
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
617
*new_process = (struct process){ .pid = pid,
619
.next = process_list };
621
process_list = new_process;
1063
622
/* Unblock SIGCHLD so signal handler can be run if this process
1064
623
has already completed */
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
624
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1077
if(maxfd < new_plugin->fd){
1078
maxfd = new_plugin->fd;
1082
TEMP_FAILURE_RETRY(closedir(dir));
626
perror("sigprocmask");
627
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);
1084
free_plugin(getplugin(NULL));
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1090
if(p->next == NULL){
1091
fprintf(stderr, "No plugin processes started. Incorrect plugin"
649
if (process_list == NULL){
650
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1097
/* Main loop while running plugins exist */
1099
655
fd_set rfds = rfds_all;
1100
656
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
657
if (select_ret == -1){
659
exitstatus = EXIT_FAILURE;
1106
662
/* OK, now either a process completed, or something can be read
1107
663
from one of them */
1108
for(plugin *proc = plugin_list; proc != NULL;){
664
for(process *proc = process_list; proc ; proc = proc->next){
1109
665
/* Is this process completely done? */
1110
if(proc->completed and proc->eof){
666
if(proc->eof and proc->completed){
1111
667
/* Only accept the plugin output if it exited cleanly */
1112
668
if(not WIFEXITED(proc->status)
1113
669
or WEXITSTATUS(proc->status) != 0){
1114
670
/* Bad exit by plugin */
1117
672
if(WIFEXITED(proc->status)){
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
673
fprintf(stderr, "Plugin %u exited with status %d\n",
674
(unsigned int) (proc->pid),
1121
675
WEXITSTATUS(proc->status));
1122
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(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));
1128
680
} else if(WCOREDUMP(proc->status)){
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
681
fprintf(stderr, "Plugin %d dumped core\n",
682
(unsigned int) (proc->pid));
1134
685
/* Remove the plugin */
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
686
FD_CLR(proc->fd, &rfds_all);
1138
687
/* Block signal while modifying process_list */
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1141
&sigchld_action.sa_mask,
688
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
1149
plugin *next_plugin = proc->next;
690
perror("sigprocmask");
691
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;
1153
707
/* We are done modifying process list, so unblock signal */
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
708
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1163
if(plugin_list == NULL){
711
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
1170
720
/* This process exited nicely, so print its buffer */
1172
bool bret = print_out_password(proc->buffer,
1173
proc->buffer_length);
722
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
724
perror("print_out_password");
725
exitstatus = EXIT_FAILURE;
1181
729
/* This process has not completed. Does it have any output? */
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
730
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1185
731
/* This process had nothing to say at this time */
1189
734
/* Before reading, make the process' data buffer large enough */
1190
735
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1191
736
proc->buffer = realloc(proc->buffer, proc->buffer_size
1192
737
+ (size_t) BUFFER_SIZE);
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
738
if (proc->buffer == NULL){
740
exitstatus = EXIT_FAILURE;
1198
743
proc->buffer_size += BUFFER_SIZE;
1200
745
/* Read from the process */
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1203
+ proc->buffer_length,
746
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1206
749
/* Read error from this process; ignore the error */
1212
754
proc->eof = true;
1214
proc->buffer_length += (size_t) sret;
756
proc->buffer_length += (size_t) ret;
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
1224
/* Fallback if all plugins failed, none are found or an error
764
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
765
/* Fallback if all plugins failed, none are found or an error occured */
1227
767
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1228
768
char *passwordbuffer = getpass("Password: ");
1229
size_t len = strlen(passwordbuffer);
1230
/* Strip trailing newline */
1231
if(len > 0 and passwordbuffer[len-1] == '\n'){
1232
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1235
bret = print_out_password(passwordbuffer, len);
769
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
771
perror("print_out_password");
772
exitstatus = EXIT_FAILURE;
1242
777
/* Restore old signal handler */
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
1249
if(custom_argv != NULL){
1250
for(char **arg = custom_argv+1; *arg != NULL; arg++){
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);
1256
789
if(dir != NULL){
1260
/* Kill the processes */
1261
for(plugin *p = plugin_list; p != NULL; p = p->next){
1264
ret = kill(p->pid, SIGTERM);
1265
if(ret == -1 and errno != ESRCH){
1266
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
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 */
802
free(process_list->buffer);
1272
806
/* Wait for any remaining child processes to terminate */
1274
808
ret = wait(NULL);
1275
809
} while(ret >= 0);
1276
810
if(errno != ECHILD){
1277
error(0, errno, "wait");
1285
814
return exitstatus;