24
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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
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28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
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EXIT_SUCCESS, realloc() */
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#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
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fprintf(), stderr, STDOUT_FILENO */
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#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* perror, fileno(), fprintf(),
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stderr, STDOUT_FILENO */
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#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
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stat, waitpid(), WIFEXITED(),
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WEXITSTATUS(), wait(), pid_t,
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uid_t, gid_t, getuid(), getgid(),
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#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
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FD_SET(), FD_ISSET(), FD_CLR */
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#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG(),
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#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
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#include <iso646.h> /* and, or, not */
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#include <dirent.h> /* DIR, struct dirent, opendir(),
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#include <dirent.h> /* DIR, struct dirent, fdopendir(),
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readdir(), closedir(), dirfd() */
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#include <unistd.h> /* struct stat, stat(), S_ISREG(),
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fcntl(), setuid(), setgid(),
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F_GETFD, F_SETFD, FD_CLOEXEC,
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access(), pipe(), fork(), close()
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dup2, STDOUT_FILENO, _exit(),
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dup2(), STDOUT_FILENO, _exit(),
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execv(), write(), read(),
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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#include <string.h> /* strsep, strlen(), asprintf() */
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#include <string.h> /* strsep, strlen(), asprintf(),
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#include <errno.h> /* errno */
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#include <argp.h> /* struct argp_option, struct
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argp_state, struct argp,
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size_t buffer_size;
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size_t buffer_length;
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volatile bool completed;
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volatile sig_atomic_t completed;
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struct plugin *next;
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101
static plugin *plugin_list = NULL;
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/* Gets a existing plugin based on name,
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/* Gets an existing plugin based on name,
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or if none is found, creates a new one */
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static plugin *getplugin(char *name){
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/* Check for exiting plugin with that name */
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for (plugin *p = plugin_list; p != NULL; p = p->next){
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if ((p->name == name)
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or (p->name and name and (strcmp(p->name, name) == 0))){
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/* Check for existing plugin with that name */
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for(plugin *p = plugin_list; p != NULL; p = p->next){
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or (p->name and name and (strcmp(p->name, name) == 0))){
109
113
/* Create a new plugin */
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plugin *new_plugin = malloc(sizeof(plugin));
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if (new_plugin == NULL){
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plugin *new_plugin = NULL;
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new_plugin = malloc(sizeof(plugin));
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} while(new_plugin == NULL and errno == EINTR);
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if(new_plugin == NULL){
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char *copy_name = NULL;
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if(name != NULL){
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copy_name = strdup(name);
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copy_name = strdup(name);
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} while(copy_name == NULL and errno == EINTR);
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126
if(copy_name == NULL){
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*new_plugin = (plugin) { .name = copy_name,
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.next = plugin_list };
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new_plugin->argv = malloc(sizeof(char *) * 2);
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if (new_plugin->argv == NULL){
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*new_plugin = (plugin){ .name = copy_name,
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.next = plugin_list };
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new_plugin->argv = malloc(sizeof(char *) * 2);
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} while(new_plugin->argv == NULL and errno == EINTR);
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if(new_plugin->argv == NULL){
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free(new_plugin);
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new_plugin->argv[0] = copy_name;
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new_plugin->argv[1] = NULL;
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new_plugin->environ = malloc(sizeof(char *));
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new_plugin->environ = malloc(sizeof(char *));
154
} while(new_plugin->environ == NULL and errno == EINTR);
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if(new_plugin->environ == NULL){
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158
free(new_plugin->argv);
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159
free(new_plugin);
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163
new_plugin->environ[0] = NULL;
373
401
.doc = "Group ID the plugins will run as", .group = 3 },
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402
{ .name = "debug", .key = 132,
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.doc = "Debug mode", .group = 4 },
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* These reproduce what we would get without ARGP_NO_HELP
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{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
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struct argp_state *state) {
416
error_t parse_opt(int key, char *arg, struct argp_state *state){
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421
case 'g': /* --global-options */
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while((p = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), p)){
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perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(not add_argument(getplugin(NULL), plugin_option)){
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431
case 'G': /* --global-env */
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char *envdef = strdup(arg);
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if(not add_environment(getplugin(NULL), envdef, true)){
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perror("add_environment");
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add_environment(getplugin(NULL), arg, true);
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434
case 'o': /* --options-for */
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char *p_name = strsep(&arg, ":");
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if(p_name[0] == '\0'){
416
char *opt = strsep(&arg, ":");
422
while((p = strsep(&opt, ",")) != NULL){
426
if(not add_argument(getplugin(p_name), p)){
427
perror("add_argument");
428
return ARGP_ERR_UNKNOWN;
436
char *option_list = strchr(arg, ':');
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if(option_list == NULL){
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argp_error(state, "No colon in \"%s\"", arg);
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argp_error(state, "Empty plugin name");
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while((option = strsep(&option_list, ",")) != NULL){
451
if(not add_argument(getplugin(arg), option)){
434
457
case 'E': /* --env-for */
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459
char *envdef = strchr(arg, ':');
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460
if(envdef == NULL){
443
char *p_name = strndup(arg, (size_t) (envdef-arg));
461
argp_error(state, "No colon in \"%s\"", arg);
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if(not add_environment(getplugin(p_name), envdef, true)){
449
perror("add_environment");
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argp_error(state, "Empty plugin name");
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add_environment(getplugin(arg), envdef, true);
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475
case 'd': /* --disable */
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477
plugin *p = getplugin(arg);
457
return ARGP_ERR_UNKNOWN;
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483
case 'e': /* --enable */
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485
plugin *p = getplugin(arg);
466
return ARGP_ERR_UNKNOWN;
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case 128: /* --plugin-dir */
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plugindir = strdup(arg);
473
if(plugindir == NULL){
477
495
case 129: /* --config-file */
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/* This is already done by parse_opt_config_file() */
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case 130: /* --userid */
481
uid = (uid_t)strtol(arg, NULL, 10);
499
tmpmax = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmpmax != (uid_t)tmpmax){
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argp_error(state, "Bad user ID number: \"%s\", using %"
503
PRIdMAX, arg, (intmax_t)uid);
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case 131: /* --groupid */
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gid = (gid_t)strtol(arg, NULL, 10);
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tmpmax = strtoimax(arg, &tmp, 10);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or tmpmax != (gid_t)tmpmax){
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argp_error(state, "Bad group ID number: \"%s\", using %"
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PRIdMAX, arg, (intmax_t)gid);
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case 132: /* --debug */
522
* These reproduce what we would get without ARGP_NO_HELP
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case '?': /* --help */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
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argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
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case -3: /* --usage */
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state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
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argp_state_help(state, state->out_stream,
530
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
531
case 'V': /* --version */
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fprintf(state->out_stream, "%s\n", argp_program_version);
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* When adding more options before this line, remember to also add a
537
* "case" to the "parse_opt_config_file" function below.
489
539
case ARGP_KEY_ARG:
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fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
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. */
495
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return ARGP_ERR_UNKNOWN;
549
return errno; /* Set to 0 at start */
500
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/* This option parser is the same as parse_opt() above, except it
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553
ignores everything but the --config-file option. */
502
error_t parse_opt_config_file (int key, char *arg,
503
__attribute__((unused))
504
struct argp_state *state) {
554
error_t parse_opt_config_file(int key, char *arg,
555
__attribute__((unused))
556
struct argp_state *state){
506
559
case 'g': /* --global-options */
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560
case 'G': /* --global-env */
508
561
case 'o': /* --options-for */
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666
custom_argv[custom_argc-1] = new_arg;
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custom_argv[custom_argc] = NULL;
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custom_argv[custom_argc] = NULL;
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ret = fclose(conffp);
672
} while(ret == EOF and errno == EINTR);
675
exitstatus = EXIT_FAILURE;
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/* Check for harmful errors and go to fallback. Other errors might
611
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not affect opening plugins */
612
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
682
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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684
exitstatus = EXIT_FAILURE;
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/* If there was any arguments from configuration file,
619
pass them to parser as command arguments */
688
/* If there were any arguments from the configuration file, pass
689
them to parser as command line arguments */
620
690
if(custom_argv != NULL){
621
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
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;
630
709
/* Parse actual command line arguments, to let them override the
632
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
633
if (ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
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;
653
742
/* Strip permissions down to nobody */
654
747
ret = setuid(uid);
656
749
perror("setuid");
663
if (plugindir == NULL){
666
dir = opendir(plugindir);
670
perror("Could not open plugin dir");
671
exitstatus = EXIT_FAILURE;
675
/* Set the FD_CLOEXEC flag on the directory, if possible */
752
/* Open plugin directory with close_on_exec flag */
677
int dir_fd = dirfd(dir);
679
ret = set_cloexec_flag(dir_fd);
681
perror("set_cloexec_flag");
682
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;
930
1062
free_plugin_list();
934
1066
/* Main loop while running plugins exist */
935
1067
while(plugin_list){
936
1068
fd_set rfds = rfds_all;
937
1069
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
938
if (select_ret == -1){
1070
if(select_ret == -1 and errno != EINTR){
939
1071
perror("select");
940
1072
exitstatus = EXIT_FAILURE;
943
1075
/* OK, now either a process completed, or something can be read
944
1076
from one of them */
945
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
1077
for(plugin *proc = plugin_list; proc != NULL;){
946
1078
/* Is this process completely done? */
947
if(proc->eof and proc->completed){
1079
if(proc->completed and proc->eof){
948
1080
/* Only accept the plugin output if it exited cleanly */
949
1081
if(not WIFEXITED(proc->status)
950
1082
or WEXITSTATUS(proc->status) != 0){
951
1083
/* Bad exit by plugin */
954
1086
if(WIFEXITED(proc->status)){
955
fprintf(stderr, "Plugin %u exited with status %d\n",
956
(unsigned int) (proc->pid),
1087
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1088
" status %d\n", proc->name,
1089
(intmax_t) (proc->pid),
957
1090
WEXITSTATUS(proc->status));
958
} else if(WIFSIGNALED(proc->status)) {
959
fprintf(stderr, "Plugin %u killed by signal %d\n",
960
(unsigned int) (proc->pid),
961
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)));
962
1097
} else if(WCOREDUMP(proc->status)){
963
fprintf(stderr, "Plugin %d dumped core\n",
964
(unsigned int) (proc->pid));
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
968
1103
/* Remove the plugin */
969
FD_CLR(proc->fd, &rfds_all);
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
971
1107
/* Block signal while modifying process_list */
972
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1108
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
&sigchld_action.sa_mask,
974
1113
perror("sigprocmask");
975
1114
exitstatus = EXIT_FAILURE;
1118
plugin *next_plugin = proc->next;
978
1119
free_plugin(proc);
979
1122
/* We are done modifying process list, so unblock signal */
980
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1123
ret = (int)(TEMP_FAILURE_RETRY
1124
(sigprocmask(SIG_UNBLOCK,
1125
&sigchld_action.sa_mask, NULL)));
983
1127
perror("sigprocmask");
984
1128
exitstatus = EXIT_FAILURE;