25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
27
#include <stddef.h> /* size_t, NULL */
28
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
64
62
#include <signal.h> /* struct sigaction, sigemptyset(),
65
63
sigaddset(), sigaction(),
66
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
65
SIG_UNBLOCK, kill() */
69
66
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
72
68
#define BUFFER_SIZE 256
112
108
/* Create a new plugin */
113
plugin *new_plugin = NULL;
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
109
plugin *new_plugin = malloc(sizeof(plugin));
117
110
if(new_plugin == NULL){
120
113
char *copy_name = NULL;
121
114
if(name != NULL){
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
125
116
if(copy_name == NULL){
131
*new_plugin = (plugin){ .name = copy_name,
134
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
124
.next = plugin_list };
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
126
new_plugin->argv = malloc(sizeof(char *) * 2);
139
127
if(new_plugin->argv == NULL){
141
129
free(new_plugin);
144
132
new_plugin->argv[0] = copy_name;
145
133
new_plugin->argv[1] = NULL;
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
150
136
if(new_plugin->environ == NULL){
152
138
free(new_plugin->argv);
164
150
static bool add_to_char_array(const char *new, char ***array,
166
152
/* Resize the pointed-to array to hold one more pointer */
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
171
155
/* Malloc check */
172
156
if(*array == NULL){
175
159
/* Make a copy of the new string */
179
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
180
161
if(copy == NULL){
208
189
if(strncmp(*e, def, namelen + 1) == 0){
209
190
/* It already exists */
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
192
char *new = realloc(*e, strlen(def) + 1);
228
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
229
207
* Descriptor Flags".
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
232
210
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);
234
212
/* If reading the flags failed, return error indication now. */
238
216
/* Store modified flag word in the descriptor. */
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
244
221
/* Mark processes as completed when they exit, and save their exit
246
223
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
249
225
plugin *proc = plugin_list;
400
375
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
376
struct argp_state *state) {
405
378
case 'g': /* --global-options */
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
381
while((p = strsep(&arg, ",")) != NULL){
412
if(not add_argument(getplugin(NULL), plugin_option)){
385
if(not add_argument(getplugin(NULL), p)){
413
386
perror("add_argument");
414
387
return ARGP_ERR_UNKNOWN;
427
400
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)){
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)){
436
416
perror("add_argument");
437
417
return ARGP_ERR_UNKNOWN;
477
457
plugindir = strdup(arg);
478
458
if(plugindir == NULL){
479
459
perror("strdup");
482
462
case 129: /* --config-file */
483
463
/* 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,
496
473
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",
507
481
case 132: /* --debug */
531
505
ignores everything but the --config-file option. */
532
506
error_t parse_opt_config_file(int key, char *arg,
533
507
__attribute__((unused))
534
struct argp_state *state){
508
struct argp_state *state) {
536
510
case 'g': /* --global-options */
537
511
case 'G': /* --global-env */
538
512
case 'o': /* --options-for */
582
556
conffp = fopen(AFILE, "r");
584
558
conffp = fopen(argfile, "r");
586
560
if(conffp != NULL){
587
561
char *org_line = NULL;
588
562
char *p, *arg, *new_arg, *line;
590
564
const char whitespace_delims[] = " \r\t\f\v\n";
591
565
const char comment_delim[] = "#";
594
568
custom_argv = malloc(sizeof(char*) * 2);
595
569
if(custom_argv == NULL){
634
608
custom_argv[custom_argc-1] = new_arg;
635
custom_argv[custom_argc] = NULL;
609
custom_argv[custom_argc] = NULL;
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
643
exitstatus = EXIT_FAILURE;
648
614
/* Check for harmful errors and go to fallback. Other errors might
681
647
for(char **a = p->argv; *a != NULL; a++){
682
648
fprintf(stderr, "\tArg: %s\n", *a);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
650
fprintf(stderr, "...and %u environment variables\n", p->envc);
685
651
for(char **a = p->environ; *a != NULL; a++){
686
652
fprintf(stderr, "\t%s\n", *a);
691
657
/* Strip permissions down to nobody */
694
664
perror("setgid");
701
/* Open plugin directory with close_on_exec flag */
667
if(plugindir == NULL){
670
dir = opendir(plugindir);
674
perror("Could not open plugin dir");
675
exitstatus = EXIT_FAILURE;
679
/* Set the FD_CLOEXEC flag on the directory, if possible */
704
if(plugindir == NULL){
705
dir_fd = open(PDIR, O_RDONLY |
708
#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;
681
int dir_fd = dirfd(dir);
683
ret = set_cloexec_flag(dir_fd);
685
perror("set_cloexec_flag");
686
exitstatus = EXIT_FAILURE;
812
755
if(plugindir == NULL){
813
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
756
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
816
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
758
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
821
761
perror("asprintf");
825
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
765
ret = stat(filename, &st);
832
772
/* Ignore non-executable files */
833
if(not S_ISREG(st.st_mode)
834
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
773
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
836
775
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
837
776
" with bad type or mode\n", filename);
905
844
/* Block SIGCHLD until process is safely in process list */
906
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
907
&sigchld_action.sa_mask,
845
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
910
847
perror("sigprocmask");
911
848
exitstatus = EXIT_FAILURE;
914
851
/* Starting a new process to be watched */
918
} while(pid == -1 and errno == EINTR);
921
855
exitstatus = EXIT_FAILURE;
961
895
/* Parent process */
962
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
896
close(pipefd[1]); /* Close unused write end of pipe */
965
898
plugin *new_plugin = getplugin(dirst->d_name);
966
899
if(new_plugin == NULL){
967
900
perror("getplugin");
968
ret = (int)(TEMP_FAILURE_RETRY
969
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
901
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
972
903
perror("sigprocmask");
981
912
/* Unblock SIGCHLD so signal handler can be run if this process
982
913
has already completed */
983
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
984
&sigchld_action.sa_mask,
914
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
987
916
perror("sigprocmask");
988
917
exitstatus = EXIT_FAILURE;
992
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
921
FD_SET(new_plugin->fd, &rfds_all);
995
923
if(maxfd < new_plugin->fd){
996
924
maxfd = new_plugin->fd;
1000
TEMP_FAILURE_RETRY(closedir(dir));
1002
free_plugin(getplugin(NULL));
1004
931
for(plugin *p = plugin_list; p != NULL; p = p->next){
1005
932
if(p->pid != 0){
1016
943
while(plugin_list){
1017
944
fd_set rfds = rfds_all;
1018
945
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1019
if(select_ret == -1 and errno != EINTR){
946
if(select_ret == -1){
1020
947
perror("select");
1021
948
exitstatus = EXIT_FAILURE;
1025
952
from one of them */
1026
953
for(plugin *proc = plugin_list; proc != NULL;){
1027
954
/* Is this process completely done? */
1028
if(proc->completed and proc->eof){
955
if(proc->eof and proc->completed){
1029
956
/* Only accept the plugin output if it exited cleanly */
1030
957
if(not WIFEXITED(proc->status)
1031
958
or WEXITSTATUS(proc->status) != 0){
1032
959
/* Bad exit by plugin */
1035
962
if(WIFEXITED(proc->status)){
1036
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1037
" status %d\n", proc->name,
1038
(intmax_t) (proc->pid),
963
fprintf(stderr, "Plugin %u exited with status %d\n",
964
(unsigned int) (proc->pid),
1039
965
WEXITSTATUS(proc->status));
1040
} 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)));
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));
1046
970
} else if(WCOREDUMP(proc->status)){
1047
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1048
" core\n", proc->name, (intmax_t) (proc->pid));
971
fprintf(stderr, "Plugin %u dumped core\n",
972
(unsigned int) (proc->pid));
1052
976
/* Remove the plugin */
1053
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
977
FD_CLR(proc->fd, &rfds_all);
1056
979
/* Block signal while modifying process_list */
1057
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1059
&sigchld_action.sa_mask,
980
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1062
982
perror("sigprocmask");
1063
983
exitstatus = EXIT_FAILURE;
1069
989
proc = next_plugin;
1071
991
/* 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)));
992
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1076
995
perror("sigprocmask");
1077
996
exitstatus = EXIT_FAILURE;
1099
1018
/* This process has not completed. Does it have any output? */
1100
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1019
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1103
1020
/* This process had nothing to say at this time */
1104
1021
proc = proc->next;
1116
1033
proc->buffer_size += BUFFER_SIZE;
1118
1035
/* Read from the process */
1119
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1121
+ proc->buffer_length,
1036
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1124
1039
/* Read error from this process; ignore the error */
1125
1040
proc = proc->next;