25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
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#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
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EXIT_SUCCESS, realloc() */
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#include <stdbool.h> /* bool, true, false */
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#include <stdio.h> /* perror, fileno(), fprintf(),
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stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), 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 */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
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#include <dirent.h> /* DIR, struct dirent, opendir(),
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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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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
55
#include <string.h> /* strsep, strlen(), asprintf() */
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56
#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
65
SIG_UNBLOCK, kill() */
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#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
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#define BUFFER_SIZE 256
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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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plugin *new_plugin = malloc(sizeof(plugin));
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if(new_plugin == NULL){
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char *copy_name = NULL;
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115
if(name != NULL){
123
copy_name = strdup(name);
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} while(copy_name == NULL and errno == EINTR);
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copy_name = strdup(name);
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if(copy_name == NULL){
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free(new_plugin);
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new_plugin->argv[0] = copy_name;
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135
new_plugin->argv[1] = NULL;
148
new_plugin->environ = malloc(sizeof(char *));
149
} 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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154
/* Resize the pointed-to array to hold one more pointer */
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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*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
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157
/* Malloc check */
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158
if(*array == NULL){
175
161
/* Make a copy of the new string */
179
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
180
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if(copy == NULL){
208
191
if(strncmp(*e, def, namelen + 1) == 0){
209
192
/* It already exists */
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
194
char *new = realloc(*e, strlen(def) + 1);
228
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
209
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
232
212
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
234
214
/* If reading the flags failed, return error indication now. */
238
218
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
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error_t parse_opt(int key, char *arg, __attribute__((unused))
401
381
struct argp_state *state){
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case 'g': /* --global-options */
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while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
386
while((p = strsep(&arg, ",")) != NULL){
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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;
427
405
case 'o': /* --options-for */
429
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)){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
416
while((p = strsep(&opt, ",")) != NULL){
420
if(not add_argument(getplugin(p_name), p)){
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perror("add_argument");
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422
return ARGP_ERR_UNKNOWN;
477
462
plugindir = strdup(arg);
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463
if(plugindir == NULL){
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perror("strdup");
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467
case 129: /* --config-file */
483
468
/* This is already done by parse_opt_config_file() */
485
470
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){
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
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fprintf(stderr, "Bad user ID number: \"%s\", using %"
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475
PRIdMAX "\n", arg, (intmax_t)uid);
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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){
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
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fprintf(stderr, "Bad group ID number: \"%s\", using %"
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PRIdMAX "\n", arg, (intmax_t)gid);
582
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conffp = fopen(AFILE, "r");
584
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conffp = fopen(argfile, "r");
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569
if(conffp != NULL){
587
570
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[] = "#";
594
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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;
618
custom_argv[custom_argc] = NULL;
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ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
643
exitstatus = EXIT_FAILURE;
648
623
/* Check for harmful errors and go to fallback. Other errors might
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673
perror("setuid");
701
/* Open plugin directory with close_on_exec flag */
676
if(plugindir == NULL){
679
dir = opendir(plugindir);
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
704
if(plugindir == NULL){
705
dir_fd = open(PDIR, O_RDONLY |
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#else /* not O_CLOEXEC */
710
#endif /* not O_CLOEXEC */
713
dir_fd = open(plugindir, O_RDONLY |
716
#else /* not O_CLOEXEC */
718
#endif /* not O_CLOEXEC */
722
perror("Could not open plugin dir");
723
exitstatus = EXIT_FAILURE;
728
/* Set the FD_CLOEXEC flag on the directory */
729
ret = set_cloexec_flag(dir_fd);
731
perror("set_cloexec_flag");
732
TEMP_FAILURE_RETRY(close(dir_fd));
733
exitstatus = EXIT_FAILURE;
736
#endif /* O_CLOEXEC */
738
dir = fdopendir(dir_fd);
740
perror("Could not open plugin dir");
741
TEMP_FAILURE_RETRY(close(dir_fd));
742
exitstatus = EXIT_FAILURE;
690
int dir_fd = dirfd(dir);
692
ret = set_cloexec_flag(dir_fd);
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perror("set_cloexec_flag");
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exitstatus = EXIT_FAILURE;
812
764
if(plugindir == NULL){
813
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
816
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");
825
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
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ret = stat(filename, &st);
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781
/* Ignore non-executable files */
833
if(not S_ISREG(st.st_mode)
834
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
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784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
837
785
" with bad type or mode\n", filename);
905
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/* Block SIGCHLD until process is safely in process list */
906
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
907
&sigchld_action.sa_mask,
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
910
856
perror("sigprocmask");
911
857
exitstatus = EXIT_FAILURE;
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860
/* Starting a new process to be watched */
918
} while(pid == -1 and errno == EINTR);
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864
exitstatus = EXIT_FAILURE;
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904
/* Parent process */
962
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
905
close(pipefd[1]); /* Close unused write end of pipe */
965
907
plugin *new_plugin = getplugin(dirst->d_name);
966
908
if(new_plugin == NULL){
967
909
perror("getplugin");
968
ret = (int)(TEMP_FAILURE_RETRY
969
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
972
912
perror("sigprocmask");
981
921
/* Unblock SIGCHLD so signal handler can be run if this process
982
922
has already completed */
983
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
984
&sigchld_action.sa_mask,
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
987
925
perror("sigprocmask");
988
926
exitstatus = EXIT_FAILURE;
992
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
930
FD_SET(new_plugin->fd, &rfds_all);
995
932
if(maxfd < new_plugin->fd){
996
933
maxfd = new_plugin->fd;
1000
TEMP_FAILURE_RETRY(closedir(dir));
1002
free_plugin(getplugin(NULL));
1004
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
1005
941
if(p->pid != 0){
1016
952
while(plugin_list){
1017
953
fd_set rfds = rfds_all;
1018
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1019
if(select_ret == -1 and errno != EINTR){
955
if(select_ret == -1){
1020
956
perror("select");
1021
957
exitstatus = EXIT_FAILURE;
1030
966
if(not WIFEXITED(proc->status)
1031
967
or WEXITSTATUS(proc->status) != 0){
1032
968
/* Bad exit by plugin */
1035
971
if(WIFEXITED(proc->status)){
1036
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1037
" status %d\n", proc->name,
1038
(intmax_t) (proc->pid),
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
1039
974
WEXITSTATUS(proc->status));
1040
975
} else if(WIFSIGNALED(proc->status)){
1041
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1042
" signal %d: %s\n", proc->name,
1043
(intmax_t) (proc->pid),
1044
WTERMSIG(proc->status),
1045
strsignal(WTERMSIG(proc->status)));
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
1046
979
} else if(WCOREDUMP(proc->status)){
1047
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1048
" core\n", proc->name, (intmax_t) (proc->pid));
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
1052
985
/* Remove the plugin */
1053
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
986
FD_CLR(proc->fd, &rfds_all);
1056
988
/* Block signal while modifying process_list */
1057
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1059
&sigchld_action.sa_mask,
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1062
991
perror("sigprocmask");
1063
992
exitstatus = EXIT_FAILURE;
1069
998
proc = next_plugin;
1071
1000
/* We are done modifying process list, so unblock signal */
1072
ret = (int)(TEMP_FAILURE_RETRY
1073
(sigprocmask(SIG_UNBLOCK,
1074
&sigchld_action.sa_mask, NULL)));
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1076
1004
perror("sigprocmask");
1077
1005
exitstatus = EXIT_FAILURE;
1099
1027
/* This process has not completed. Does it have any output? */
1100
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1103
1029
/* This process had nothing to say at this time */
1104
1030
proc = proc->next;
1116
1042
proc->buffer_size += BUFFER_SIZE;
1118
1044
/* Read from the process */
1119
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1121
+ proc->buffer_length,
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1124
1048
/* Read error from this process; ignore the error */
1125
1049
proc = proc->next;