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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(),
41
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 <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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#include <signal.h> /* struct sigaction, sigemptyset(),
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sigaddset(), sigaction(),
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sigprocmask(), SIG_BLOCK, SIGCHLD,
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SIG_UNBLOCK, kill(), sig_atomic_t
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SIG_UNBLOCK, kill() */
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#include <errno.h> /* errno, EBADF */
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#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
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#define BUFFER_SIZE 256
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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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or (p->name and name and (strcmp(p->name, name) == 0))){
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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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/* Create a new plugin */
113
plugin *new_plugin = NULL;
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new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
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if(new_plugin == NULL){
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plugin *new_plugin = malloc(sizeof(plugin));
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if (new_plugin == NULL){
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113
char *copy_name = NULL;
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if(name != NULL){
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copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
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if(copy_name == NULL){
131
*new_plugin = (plugin){ .name = copy_name,
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.next = plugin_list };
121
*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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new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
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free(new_plugin);
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132
new_plugin->argv[0] = copy_name;
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133
new_plugin->argv[1] = NULL;
148
new_plugin->environ = malloc(sizeof(char *));
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} while(new_plugin->environ == NULL and errno == EINTR);
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new_plugin->environ = malloc(sizeof(char *));
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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static bool add_to_char_array(const char *new, char ***array,
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/* Resize the pointed-to array to hold one more pointer */
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*array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
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} while(*array == NULL and errno == EINTR);
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*array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
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/* Malloc check */
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if(*array == NULL){
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/* Make a copy of the new string */
179
} while(copy == NULL and errno == EINTR);
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char *copy = strdup(new);
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if(copy == NULL){
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if(strncmp(*e, def, namelen + 1) == 0){
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/* It already exists */
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
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char *new = realloc(*e, strlen(def) + 1);
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206
* Based on the example in the GNU LibC manual chapter 13.13 "File
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* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
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static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
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/* If reading the flags failed, return error indication now. */
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/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
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return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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/* Mark processes as completed when they exit, and save their exit
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static void handle_sigchld(__attribute__((unused)) int sig){
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int old_errno = errno;
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plugin *proc = plugin_list;
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error_t parse_opt(int key, char *arg, __attribute__((unused))
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struct argp_state *state){
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
376
struct argp_state *state) {
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case 'g': /* --global-options */
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while((plugin_option = strsep(&arg, ",")) != NULL){
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if(plugin_option[0] == '\0'){
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while((p = strsep(&arg, ",")) != NULL){
412
if(not add_argument(getplugin(NULL), plugin_option)){
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if(not add_argument(getplugin(NULL), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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case 'o': /* --options-for */
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char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
402
char *p_name = strsep(&arg, ":");
403
if(p_name[0] == '\0' or arg == NULL){
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
411
while((p = strsep(&opt, ",")) != NULL){
415
if(not add_argument(getplugin(p_name), p)){
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perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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plugindir = strdup(arg);
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if(plugindir == NULL){
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perror("strdup");
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case 129: /* --config-file */
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/* This is already done by parse_opt_config_file() */
485
465
case 130: /* --userid */
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
466
/* In the GNU C library, uid_t is always unsigned int */
467
ret = sscanf(arg, "%u", &uid);
469
fprintf(stderr, "Bad user ID number: \"%s\", using %u\n", arg,
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case 131: /* --groupid */
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
474
/* In the GNU C library, gid_t is always unsigned int */
475
ret = sscanf(arg, "%u", &gid);
477
fprintf(stderr, "Bad group ID number: \"%s\", using %u\n",
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case 132: /* --debug */
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/* This option parser is the same as parse_opt() above, except it
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ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
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case 'g': /* --global-options */
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case 'G': /* --global-env */
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case 'o': /* --options-for */
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/* Parse using parse_opt_config_file() in order to get the custom
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config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
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ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
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if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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exitstatus = EXIT_FAILURE;
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argp.parser = parse_opt;
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/* Open the configfile if available */
555
if (argfile == NULL){
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conffp = fopen(AFILE, "r");
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conffp = fopen(argfile, "r");
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if(conffp != NULL){
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char *org_line = NULL;
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char *p, *arg, *new_arg, *line;
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const char whitespace_delims[] = " \r\t\f\v\n";
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const char comment_delim[] = "#";
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custom_argv = malloc(sizeof(char*) * 2);
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if(custom_argv == NULL){
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custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
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custom_argv[custom_argc] = NULL;
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ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
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exitstatus = EXIT_FAILURE;
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/* Check for harmful errors and go to fallback. Other errors might
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not affect opening plugins */
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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exitstatus = EXIT_FAILURE;
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/* If there was any arguments from configuration file,
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pass them to parser as command arguments */
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if(custom_argv != NULL){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
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if(ret == ARGP_ERR_UNKNOWN){
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ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
627
if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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629
exitstatus = EXIT_FAILURE;
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/* Parse actual command line arguments, to let them override the
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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exitstatus = EXIT_FAILURE;
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for(char **a = p->argv; *a != NULL; a++){
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fprintf(stderr, "\tArg: %s\n", *a);
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fprintf(stderr, "...and %d environment variables\n", p->envc);
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fprintf(stderr, "...and %u environment variables\n", p->envc);
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for(char **a = p->environ; *a != NULL; a++){
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fprintf(stderr, "\t%s\n", *a);
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if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
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ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
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ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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perror("asprintf");
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
765
ret = stat(filename, &st);
811
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/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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fprintf(stderr, "Ignoring plugin dir entry \"%s\""
816
776
" with bad type or mode\n", filename);
884
844
/* Block SIGCHLD until process is safely in process list */
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
889
847
perror("sigprocmask");
890
848
exitstatus = EXIT_FAILURE;
893
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/* Starting a new process to be watched */
897
} while(pid == -1 and errno == EINTR);
900
855
exitstatus = EXIT_FAILURE;
940
895
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
896
close(pipefd[1]); /* Close unused write end of pipe */
944
898
plugin *new_plugin = getplugin(dirst->d_name);
945
if(new_plugin == NULL){
899
if (new_plugin == NULL){
946
900
perror("getplugin");
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
951
903
perror("sigprocmask");
960
912
/* Unblock SIGCHLD so signal handler can be run if this process
961
913
has already completed */
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
966
916
perror("sigprocmask");
967
917
exitstatus = EXIT_FAILURE;
971
921
FD_SET(new_plugin->fd, &rfds_all);
973
if(maxfd < new_plugin->fd){
923
if (maxfd < new_plugin->fd){
974
924
maxfd = new_plugin->fd;
978
TEMP_FAILURE_RETRY(closedir(dir));
980
free_plugin(getplugin(NULL));
982
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
994
943
while(plugin_list){
995
944
fd_set rfds = rfds_all;
996
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
997
if(select_ret == -1 and errno != EINTR){
946
if (select_ret == -1){
998
947
perror("select");
999
948
exitstatus = EXIT_FAILURE;
1003
952
from one of them */
1004
953
for(plugin *proc = plugin_list; proc != NULL;){
1005
954
/* Is this process completely done? */
1006
if(proc->completed and proc->eof){
955
if(proc->eof and proc->completed){
1007
956
/* Only accept the plugin output if it exited cleanly */
1008
957
if(not WIFEXITED(proc->status)
1009
958
or WEXITSTATUS(proc->status) != 0){
1010
959
/* Bad exit by plugin */
1013
962
if(WIFEXITED(proc->status)){
1014
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1015
" status %d\n", proc->name,
1016
(intmax_t) (proc->pid),
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1017
965
WEXITSTATUS(proc->status));
1018
} else if(WIFSIGNALED(proc->status)){
1019
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1020
" signal %d: %s\n", proc->name,
1021
(intmax_t) (proc->pid),
1022
WTERMSIG(proc->status),
1023
strsignal(WTERMSIG(proc->status)));
966
} else if(WIFSIGNALED(proc->status)) {
967
fprintf(stderr, "Plugin %u killed by signal %d\n",
968
(unsigned int) (proc->pid),
969
WTERMSIG(proc->status));
1024
970
} else if(WCOREDUMP(proc->status)){
1025
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1026
" core\n", proc->name, (intmax_t) (proc->pid));
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1030
976
/* Remove the plugin */
1031
977
FD_CLR(proc->fd, &rfds_all);
1033
979
/* Block signal while modifying process_list */
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1036
&sigchld_action.sa_mask,
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1039
982
perror("sigprocmask");
1040
983
exitstatus = EXIT_FAILURE;
1046
989
proc = next_plugin;
1048
991
/* We are done modifying process list, so unblock signal */
1049
ret = (int)(TEMP_FAILURE_RETRY
1050
(sigprocmask(SIG_UNBLOCK,
1051
&sigchld_action.sa_mask, NULL)));
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1053
995
perror("sigprocmask");
1054
996
exitstatus = EXIT_FAILURE;
1083
1025
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1084
1026
proc->buffer = realloc(proc->buffer, proc->buffer_size
1085
1027
+ (size_t) BUFFER_SIZE);
1086
if(proc->buffer == NULL){
1028
if (proc->buffer == NULL){
1087
1029
perror("malloc");
1088
1030
exitstatus = EXIT_FAILURE;
1091
1033
proc->buffer_size += BUFFER_SIZE;
1093
1035
/* Read from the process */
1094
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1096
+ proc->buffer_length,
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1099
1039
/* Read error from this process; ignore the error */
1100
1040
proc = proc->next;