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(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
58
61
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
ARGP_KEY_END, ARGP_KEY_ARG,
60
64
#include <signal.h> /* struct sigaction, sigemptyset(),
61
65
sigaddset(), sigaction(),
62
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
64
69
#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() */
66
76
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
typedef struct process{
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*/
78
96
size_t buffer_size;
79
97
size_t buffer_length;
99
volatile sig_atomic_t completed;
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
93
101
struct plugin *next;
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
103
116
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
117
plugin *new_plugin = NULL;
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
108
124
char *copy_name = NULL;
109
125
if(name != NULL){
110
copy_name = strdup(name);
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
111
129
if(copy_name == NULL){
116
*new_plugin = (plugin) { .name = copy_name,
120
.next = *plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
140
.next = plugin_list };
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
125
148
free(new_plugin);
128
152
new_plugin->argv[0] = copy_name;
129
153
new_plugin->argv[1] = NULL;
131
new_plugin->environ = malloc(sizeof(char *));
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
132
158
if(new_plugin->environ == NULL){
134
161
free(new_plugin->argv);
135
162
free(new_plugin);
138
166
new_plugin->environ[0] = NULL;
139
168
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
141
170
return new_plugin;
175
209
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
210
static bool add_environment(plugin *p, const char *def, bool replace){
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
180
234
return add_to_char_array(def, &(p->environ), &(p->envc));
185
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
239
* Descriptor Flags".
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
static int set_cloexec_flag(int fd)
191
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
244
/* If reading the flags failed, return error indication now. */
196
248
/* Store modified flag word in the descriptor. */
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
200
process *process_list = NULL;
202
/* Mark processes as completed when it exits, and save its exit
254
/* Mark processes as completed when they exit, and save their exit
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
259
plugin *proc = plugin_list;
208
261
pid_t pid = waitpid(-1, &status, WNOHANG);
263
/* Only still running child processes */
213
if (errno != ECHILD){
268
/* No child processes */
271
error(0, errno, "waitpid");
274
/* A child exited, find it in process_list */
219
275
while(proc != NULL and proc->pid != pid){
220
276
proc = proc->next;
319
375
{ .name = "global-options", .key = 'g',
320
376
.arg = "OPTION[,OPTION[,...]]",
321
377
.doc = "Options passed to all plugins" },
322
{ .name = "global-envs", .key = 'e',
378
{ .name = "global-env", .key = 'G',
323
379
.arg = "VAR=value",
324
380
.doc = "Environment variable passed to all plugins" },
325
381
{ .name = "options-for", .key = 'o',
326
382
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
327
383
.doc = "Options passed only to specified plugin" },
328
{ .name = "envs-for", .key = 'f',
384
{ .name = "env-for", .key = 'E',
329
385
.arg = "PLUGIN:ENV=value",
330
386
.doc = "Environment variable passed to specified plugin" },
331
387
{ .name = "disable", .key = 'd',
333
389
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
392
.doc = "Enable a specific plugin", .group = 1 },
334
393
{ .name = "plugin-dir", .key = 128,
335
394
.arg = "DIRECTORY",
336
395
.doc = "Specify a different plugin directory", .group = 2 },
337
{ .name = "userid", .key = 129,
338
.arg = "ID", .flags = 0,
339
.doc = "User ID the plugins will run as", .group = 2 },
340
{ .name = "groupid", .key = 130,
341
.arg = "ID", .flags = 0,
342
.doc = "Group ID the plugins will run as", .group = 2 },
343
{ .name = "debug", .key = 131,
344
.doc = "Debug mode", .group = 3 },
396
{ .name = "config-file", .key = 129,
398
.doc = "Specify a different configuration file", .group = 2 },
399
{ .name = "userid", .key = 130,
400
.arg = "ID", .flags = 0,
401
.doc = "User ID the plugins will run as", .group = 3 },
402
{ .name = "groupid", .key = 131,
403
.arg = "ID", .flags = 0,
404
.doc = "Group ID the plugins will run as", .group = 3 },
405
{ .name = "debug", .key = 132,
406
.doc = "Debug mode", .group = 4 },
408
* These reproduce what we would get without ARGP_NO_HELP
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
348
error_t parse_opt (int key, char *arg, struct argp_state *state) {
349
/* Get the INPUT argument from `argp_parse', which we know is a
350
pointer to our plugin list pointer. */
351
plugin **plugins = state->input;
356
while((p = strsep(&arg, ",")) != NULL){
360
if(not add_argument(getplugin(NULL, plugins), p)){
361
perror("add_argument");
362
return ARGP_ERR_UNKNOWN;
372
char *envdef = strdup(arg);
376
if(not add_environment(getplugin(NULL, plugins), envdef)){
377
perror("add_environment");
383
char *p_name = strsep(&arg, ":");
384
if(p_name[0] == '\0'){
387
char *opt = strsep(&arg, ":");
393
while((p = strsep(&opt, ",")) != NULL){
397
if(not add_argument(getplugin(p_name, plugins), p)){
398
perror("add_argument");
399
return ARGP_ERR_UNKNOWN;
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
424
case 'g': /* --global-options */
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
437
case 'o': /* --options-for */
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
448
argp_error(state, "Empty plugin name");
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
460
case 'E': /* --env-for */
410
462
char *envdef = strchr(arg, ':');
411
463
if(envdef == NULL){
414
char *p_name = strndup(arg, (size_t) (envdef-arg));
464
argp_error(state, "No colon in \"%s\"", arg);
419
if(not add_environment(getplugin(p_name, plugins), envdef)){
420
perror("add_environment");
426
plugin *p = getplugin(arg, plugins);
428
return ARGP_ERR_UNKNOWN;
437
uid = (uid_t)strtol(arg, NULL, 10);
440
gid = (gid_t)strtol(arg, NULL, 10);
471
argp_error(state, "Empty plugin name");
475
add_environment(getplugin(arg), envdef, true);
478
case 'd': /* --disable */
480
plugin *p = getplugin(arg);
486
case 'e': /* --enable */
488
plugin *p = getplugin(arg);
494
case 128: /* --plugin-dir */
496
plugindir = strdup(arg);
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
521
case 132: /* --debug */
446
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
return ARGP_ERR_UNKNOWN;
456
plugin *plugin_list = NULL;
458
struct argp argp = { .options = options, .parser = parse_opt,
459
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
* These reproduce what we would get without ARGP_NO_HELP
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
550
return ARGP_ERR_UNKNOWN;
552
return errno; /* Set to 0 at start */
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
570
case 129: /* --config-file */
572
argfile = strdup(arg);
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
583
return ARGP_ERR_UNKNOWN;
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
460
591
.doc = "Mandos plugin runner -- Run plugins" };
462
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
463
if (ret == ARGP_ERR_UNKNOWN){
464
fprintf(stderr, "Unknown error while parsing arguments\n");
465
exitstatus = EXIT_FAILURE;
469
conffp = fopen(argfile, "r");
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
608
exitstatus = EX_USAGE;
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
615
/* Open the configfile if available */
617
conffp = fopen(AFILE, "r");
619
conffp = fopen(argfile, "r");
470
621
if(conffp != NULL){
471
622
char *org_line = NULL;
472
623
char *p, *arg, *new_arg, *line;
475
625
const char whitespace_delims[] = " \r\t\f\v\n";
476
626
const char comment_delim[] = "#";
629
custom_argv = malloc(sizeof(char*) * 2);
630
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
635
custom_argv[0] = argv[0];
636
custom_argv[1] = NULL;
638
/* for each line in the config file, strip whitespace and ignore
479
641
sret = getline(&org_line, &size, conffp);
485
647
arg = strsep(&line, comment_delim);
486
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
490
652
new_arg = strdup(p);
491
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
492
if (custom_argv == NULL){
493
perror("add_to_argv");
494
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
661
custom_argv = realloc(custom_argv, sizeof(char *)
662
* ((unsigned int) custom_argc + 1));
663
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
669
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
501
683
/* Check for harmful errors and go to fallback. Other errors might
502
684
not affect opening plugins */
503
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
505
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
510
693
if(custom_argv != NULL){
511
custom_argv[0] = argv[0];
512
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
513
if (ret == ARGP_ERR_UNKNOWN){
514
fprintf(stderr, "Unknown error while parsing arguments\n");
515
exitstatus = EXIT_FAILURE;
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
707
exitstatus = EX_CONFIG;
712
/* Parse actual command line arguments, to let them override the
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
727
exitstatus = EX_USAGE;
521
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
522
733
fprintf(stderr, "Plugin: %s has %d arguments\n",
524
735
for(char **a = p->argv; *a != NULL; a++){
525
736
fprintf(stderr, "\tArg: %s\n", *a);
527
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
528
739
for(char **a = p->environ; *a != NULL; a++){
529
740
fprintf(stderr, "\t%s\n", *a);
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
754
error(0, errno, "fstat");
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
759
error(0, errno, "fchown");
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
767
/* Lower permissions */
770
error(0, errno, "setgid");
534
772
ret = setuid(uid);
544
dir = opendir(plugindir);
546
perror("Could not open plugin dir");
547
exitstatus = EXIT_FAILURE;
551
/* Set the FD_CLOEXEC flag on the directory, if possible */
774
error(0, errno, "setuid");
777
/* Open plugin directory with close_on_exec flag */
553
int dir_fd = dirfd(dir);
555
ret = set_cloexec_flag(dir_fd);
557
perror("set_cloexec_flag");
558
exitstatus = EXIT_FAILURE;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
784
#else /* not O_CLOEXEC */
786
#endif /* not O_CLOEXEC */
789
dir_fd = open(plugindir, O_RDONLY |
792
#else /* not O_CLOEXEC */
794
#endif /* not O_CLOEXEC */
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
812
#endif /* O_CLOEXEC */
814
dir = fdopendir(dir_fd);
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
564
823
FD_ZERO(&rfds_all);
825
/* Read and execute any executable in the plugin directory*/
567
dirst = readdir(dir);
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
569
// All directory entries have been processed
831
/* All directory entries have been processed */
570
832
if(dirst == NULL){
573
exitstatus = EXIT_FAILURE;
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
682
953
if(p->environ[0] != NULL){
683
954
for(char **e = environ; *e != NULL; e++){
684
char *copy = strdup(*e);
689
if(not add_environment(p, copy)){
690
perror("add_environment");
955
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
699
exitstatus = EXIT_FAILURE;
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
968
/* Ask OS to automatic close the pipe on exec */
702
969
ret = set_cloexec_flag(pipefd[0]);
704
perror("set_cloexec_flag");
705
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
708
975
ret = set_cloexec_flag(pipefd[1]);
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
714
981
/* Block SIGCHLD until process is safely in process list */
715
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
717
perror("sigprocmask");
718
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
721
// Starting a new process to be watched
990
/* Starting a new process to be watched */
994
} while(pid == -1 and errno == EINTR);
725
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
729
1001
/* this is the child process */
730
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1004
error(0, errno, "sigaction");
735
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
737
perror("sigprocmask");
1009
error(0, errno, "sigprocmask");
741
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1015
error(0, errno, "dup2");
747
1019
if(dirfd(dir) < 0){
752
1024
if(p->environ[0] == NULL){
753
1025
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
758
1030
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1037
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
767
close(pipefd[1]); /* close unused write end of pipe */
768
process *new_process = malloc(sizeof(process));
769
if (new_process == NULL){
771
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1041
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
773
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
775
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
779
*new_process = (struct process){ .pid = pid,
781
.next = process_list };
783
process_list = new_process;
1054
new_plugin->pid = pid;
1055
new_plugin->fd = pipefd[0];
784
1057
/* Unblock SIGCHLD so signal handler can be run if this process
785
1058
has already completed */
786
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
788
perror("sigprocmask");
789
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
793
FD_SET(new_process->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
795
if (maxfd < new_process->fd){
796
maxfd = new_process->fd;
1071
if(maxfd < new_plugin->fd){
1072
maxfd = new_plugin->fd;
801
free_plugin_list(plugin_list);
1076
TEMP_FAILURE_RETRY(closedir(dir));
807
if (process_list == NULL){
808
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1078
free_plugin(getplugin(NULL));
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1084
if(p->next == NULL){
1085
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1091
/* Main loop while running plugins exist */
813
1093
fd_set rfds = rfds_all;
814
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
815
if (select_ret == -1){
817
exitstatus = EXIT_FAILURE;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
820
1100
/* OK, now either a process completed, or something can be read
821
1101
from one of them */
822
for(process *proc = process_list; proc ; proc = proc->next){
1102
for(plugin *proc = plugin_list; proc != NULL;){
823
1103
/* Is this process completely done? */
824
if(proc->eof and proc->completed){
1104
if(proc->completed and proc->eof){
825
1105
/* Only accept the plugin output if it exited cleanly */
826
1106
if(not WIFEXITED(proc->status)
827
1107
or WEXITSTATUS(proc->status) != 0){
828
1108
/* Bad exit by plugin */
830
1111
if(WIFEXITED(proc->status)){
831
fprintf(stderr, "Plugin %u exited with status %d\n",
832
(unsigned int) (proc->pid),
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
833
1115
WEXITSTATUS(proc->status));
834
} else if(WIFSIGNALED(proc->status)) {
835
fprintf(stderr, "Plugin %u killed by signal %d\n",
836
(unsigned int) (proc->pid),
837
WTERMSIG(proc->status));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
838
1122
} else if(WCOREDUMP(proc->status)){
839
fprintf(stderr, "Plugin %d dumped core\n",
840
(unsigned int) (proc->pid));
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
843
1128
/* Remove the plugin */
844
FD_CLR(proc->fd, &rfds_all);
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
845
1132
/* Block signal while modifying process_list */
846
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1135
&sigchld_action.sa_mask,
848
perror("sigprocmask");
849
exitstatus = EXIT_FAILURE;
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
852
/* Delete this process entry from the list */
853
if(process_list == proc){
854
/* First one - simple */
855
process_list = proc->next;
857
/* Second one or later */
858
for(process *p = process_list; p != NULL; p = p->next){
860
p->next = proc->next;
1143
plugin *next_plugin = proc->next;
865
1147
/* We are done modifying process list, so unblock signal */
866
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
869
perror("sigprocmask");
873
/* We deleted this process from the list, so we can't go
874
proc->next. Therefore, start over from the beginning of
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1157
if(plugin_list == NULL){
878
1164
/* This process exited nicely, so print its buffer */
880
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1166
bool bret = print_out_password(proc->buffer,
1167
proc->buffer_length);
882
perror("print_out_password");
883
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
887
1175
/* This process has not completed. Does it have any output? */
888
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
889
1179
/* This process had nothing to say at this time */
892
1183
/* Before reading, make the process' data buffer large enough */
893
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
894
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
895
1186
+ (size_t) BUFFER_SIZE);
896
if (proc->buffer == NULL){
898
exitstatus = EXIT_FAILURE;
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
901
1192
proc->buffer_size += BUFFER_SIZE;
903
1194
/* Read from the process */
904
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1197
+ proc->buffer_length,
907
1200
/* Read error from this process; ignore the error */
912
1206
proc->eof = true;
914
proc->buffer_length += (size_t) ret;
1208
proc->buffer_length += (size_t) sret;
922
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
923
/* Fallback if all plugins failed, none are found or an error occured */
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
1218
/* Fallback if all plugins failed, none are found or an error
925
1221
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1222
char *passwordbuffer = getpass("Password: ");
927
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1223
size_t len = strlen(passwordbuffer);
1224
/* Strip trailing newline */
1225
if(len > 0 and passwordbuffer[len-1] == '\n'){
1226
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1229
bret = print_out_password(passwordbuffer, len);
929
perror("print_out_password");
930
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
934
1236
/* Restore old signal handler */
935
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
938
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
941
1243
if(custom_argv != NULL){
942
for(char **arg = custom_argv; *arg != NULL; arg++){
1244
for(char **arg = custom_argv+1; *arg != NULL; arg++){
945
1247
free(custom_argv);
947
free_plugin_list(plugin_list);
949
1250
if(dir != NULL){
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
1254
/* Kill the processes */
1255
for(plugin *p = plugin_list; p != NULL; p = p->next){
1258
ret = kill(p->pid, SIGTERM);
1259
if(ret == -1 and errno != ESRCH){
1260
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
962
free(process_list->buffer);
966
1266
/* Wait for any remaining child processes to terminate */
968
1268
ret = wait(NULL);
969
1269
} while(ret >= 0);
970
1270
if(errno != ECHILD){
1271
error(0, errno, "wait");
974
1279
return exitstatus;