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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() */
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SIG_UNBLOCK, kill(), sig_atomic_t
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#include <errno.h> /* errno, EBADF */
70
#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 */
102
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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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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112
/* Create a new plugin */
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plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
113
plugin *new_plugin = NULL;
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
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120
char *copy_name = NULL;
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121
if(name != NULL){
115
copy_name = strdup(name);
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copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
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if(copy_name == NULL){
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
131
*new_plugin = (plugin){ .name = copy_name,
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.next = plugin_list };
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
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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 *));
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
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if(new_plugin->environ == NULL){
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free(new_plugin->argv);
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164
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));
168
*array = realloc(*array, sizeof(char *)
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* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
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/* Malloc check */
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if(*array == NULL){
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/* Make a copy of the new string */
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char *copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
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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 */
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char *new = realloc(*e, strlen(def) + 1);
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new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
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228
* Based on the example in the GNU LibC manual chapter 13.13 "File
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* Descriptor Flags".
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
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static int set_cloexec_flag(int fd){
211
int ret = fcntl(fd, F_GETFD, 0);
233
int ret = TEMP_FAILURE_RETRY(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. */
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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return TEMP_FAILURE_RETRY(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) {
399
error_t parse_opt(int key, char *arg, __attribute__((unused))
400
struct argp_state *state){
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404
case 'g': /* --global-options */
381
while((p = strsep(&arg, ",")) != NULL){
407
while((plugin_option = strsep(&arg, ",")) != NULL){
408
if(plugin_option[0] == '\0'){
385
if(not add_argument(getplugin(NULL), p)){
411
if(not add_argument(getplugin(NULL), plugin_option)){
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412
perror("add_argument");
387
413
return ARGP_ERR_UNKNOWN;
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426
case 'o': /* --options-for */
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)){
428
char *plugin_name = strsep(&arg, ":");
429
if(plugin_name[0] == '\0'){
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(plugin_name), plugin_option)){
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435
perror("add_argument");
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return ARGP_ERR_UNKNOWN;
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476
plugindir = strdup(arg);
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477
if(plugindir == NULL){
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perror("strdup");
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481
case 129: /* --config-file */
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/* This is already done by parse_opt_config_file() */
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484
case 130: /* --userid */
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,
486
tmpmax = strtoimax(arg, &tmp, 10);
487
if(errno != 0 or tmp == arg or *tmp != '\0'
488
or tmpmax != (uid_t)tmpmax){
489
fprintf(stderr, "Bad user ID number: \"%s\", using %"
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PRIdMAX "\n", arg, (intmax_t)uid);
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case 131: /* --groupid */
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/* 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",
497
tmpmax = strtoimax(arg, &tmp, 10);
498
if(errno != 0 or tmp == arg or *tmp != '\0'
499
or tmpmax != (gid_t)tmpmax){
500
fprintf(stderr, "Bad group ID number: \"%s\", using %"
501
PRIdMAX "\n", arg, (intmax_t)gid);
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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. */
506
error_t parse_opt_config_file (int key, char *arg,
507
__attribute__((unused))
508
struct argp_state *state) {
531
error_t parse_opt_config_file(int key, char *arg,
532
__attribute__((unused))
533
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. */
544
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
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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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579
/* Open the configfile if available */
555
if (argfile == NULL){
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581
conffp = fopen(AFILE, "r");
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583
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;
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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);
639
} 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 */
616
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
649
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
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exitstatus = EXIT_FAILURE;
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655
/* If there was any arguments from configuration file,
623
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pass them to parser as command arguments */
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if(custom_argv != NULL){
625
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
627
if (ret == ARGP_ERR_UNKNOWN){
658
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
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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;
634
667
/* Parse actual command line arguments, to let them override the
636
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
637
if (ret == ARGP_ERR_UNKNOWN){
669
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
670
if(ret == ARGP_ERR_UNKNOWN){
638
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fprintf(stderr, "Unknown error while parsing arguments\n");
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672
exitstatus = EXIT_FAILURE;
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680
for(char **a = p->argv; *a != NULL; a++){
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fprintf(stderr, "\tArg: %s\n", *a);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
683
fprintf(stderr, "...and %d environment variables\n", p->envc);
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684
for(char **a = p->environ; *a != NULL; a++){
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fprintf(stderr, "\t%s\n", *a);
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790
if(plugindir == NULL){
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
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ret = TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
794
ret = TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s", plugindir,
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perror("asprintf");
765
ret = stat(filename, &st);
802
ret = TEMP_FAILURE_RETRY(stat(filename, &st));
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809
/* Ignore non-executable files */
773
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
810
if(not S_ISREG(st.st_mode)
811
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
775
813
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
776
814
" with bad type or mode\n", filename);
844
882
/* Block SIGCHLD until process is safely in process list */
845
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
883
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
884
&sigchld_action.sa_mask,
847
887
perror("sigprocmask");
848
888
exitstatus = EXIT_FAILURE;
851
891
/* Starting a new process to be watched */
895
} while(pid == -1 and errno == EINTR);
855
898
exitstatus = EXIT_FAILURE;
895
938
/* Parent process */
896
close(pipefd[1]); /* Close unused write end of pipe */
939
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
898
942
plugin *new_plugin = getplugin(dirst->d_name);
899
if (new_plugin == NULL){
943
if(new_plugin == NULL){
900
944
perror("getplugin");
901
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
945
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
946
&sigchld_action.sa_mask,
903
949
perror("sigprocmask");
912
958
/* Unblock SIGCHLD so signal handler can be run if this process
913
959
has already completed */
914
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
960
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
961
&sigchld_action.sa_mask,
916
964
perror("sigprocmask");
917
965
exitstatus = EXIT_FAILURE;
921
969
FD_SET(new_plugin->fd, &rfds_all);
923
if (maxfd < new_plugin->fd){
971
if(maxfd < new_plugin->fd){
924
972
maxfd = new_plugin->fd;
976
TEMP_FAILURE_RETRY(closedir(dir));
978
free_plugin(getplugin(NULL));
931
980
for(plugin *p = plugin_list; p != NULL; p = p->next){
943
992
while(plugin_list){
944
993
fd_set rfds = rfds_all;
945
994
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
946
if (select_ret == -1){
995
if(select_ret == -1 and errno != EINTR){
947
996
perror("select");
948
997
exitstatus = EXIT_FAILURE;
952
1001
from one of them */
953
1002
for(plugin *proc = plugin_list; proc != NULL;){
954
1003
/* Is this process completely done? */
955
if(proc->eof and proc->completed){
1004
if(proc->completed and proc->eof){
956
1005
/* Only accept the plugin output if it exited cleanly */
957
1006
if(not WIFEXITED(proc->status)
958
1007
or WEXITSTATUS(proc->status) != 0){
959
1008
/* Bad exit by plugin */
962
1011
if(WIFEXITED(proc->status)){
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1012
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1013
" status %d\n", proc->name,
1014
(intmax_t) (proc->pid),
965
1015
WEXITSTATUS(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));
1016
} else if(WIFSIGNALED(proc->status)){
1017
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1018
" signal %d: %s\n", proc->name,
1019
(intmax_t) (proc->pid),
1020
WTERMSIG(proc->status),
1021
strsignal(WTERMSIG(proc->status)));
970
1022
} else if(WCOREDUMP(proc->status)){
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1023
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1024
" core\n", proc->name, (intmax_t) (proc->pid));
976
1028
/* Remove the plugin */
977
1029
FD_CLR(proc->fd, &rfds_all);
979
1031
/* Block signal while modifying process_list */
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1032
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1033
&sigchld_action.sa_mask,
982
1036
perror("sigprocmask");
983
1037
exitstatus = EXIT_FAILURE;
989
1043
proc = next_plugin;
991
1045
/* We are done modifying process list, so unblock signal */
992
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
ret = TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1047
&sigchld_action.sa_mask,
995
1050
perror("sigprocmask");
996
1051
exitstatus = EXIT_FAILURE;
1025
1080
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1026
1081
proc->buffer = realloc(proc->buffer, proc->buffer_size
1027
1082
+ (size_t) BUFFER_SIZE);
1028
if (proc->buffer == NULL){
1083
if(proc->buffer == NULL){
1029
1084
perror("malloc");
1030
1085
exitstatus = EXIT_FAILURE;
1033
1088
proc->buffer_size += BUFFER_SIZE;
1035
1090
/* Read from the process */
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1091
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1093
+ proc->buffer_length,
1039
1096
/* Read error from this process; ignore the error */
1040
1097
proc = proc->next;