19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
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_SUCCESS,
30
30
#include <stdbool.h> /* bool, true, false */
31
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
54
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
52
FD_CLOEXEC, openat(), scandirat(),
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
488
511
plugin *p = getplugin(arg);
490
513
p->disabled = false;
494
518
case 128: /* --plugin-dir */
496
520
plugindir = strdup(arg);
521
if(plugindir != NULL){
498
525
case 129: /* --config-file */
499
526
/* This is already done by parse_opt_config_file() */
501
528
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
529
tmp_id = strtoimax(arg, &tmp, 10);
503
530
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
531
or tmp_id != (uid_t)tmp_id){
505
532
argp_error(state, "Bad user ID number: \"%s\", using %"
506
533
PRIdMAX, arg, (intmax_t)uid);
511
539
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
540
tmp_id = strtoimax(arg, &tmp, 10);
513
541
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
542
or tmp_id != (gid_t)tmp_id){
515
543
argp_error(state, "Bad group ID number: \"%s\", using %"
516
544
PRIdMAX, arg, (intmax_t)gid);
521
550
case 132: /* --debug */
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
525
561
* These reproduce what we would get without ARGP_NO_HELP
805
859
ret = set_cloexec_flag(dir_fd);
807
861
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
862
exitstatus = EX_OSERR;
812
865
#endif /* O_CLOEXEC */
814
dir = fdopendir(dir_fd);
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
879
#pragma GCC diagnostic pop
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
898
exitstatus = EX_OSERR;
823
902
FD_ZERO(&rfds_all);
825
904
/* Read and execute any executable in the plugin directory*/
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
831
/* All directory entries have been processed */
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
841
d_name_len = strlen(dirst->d_name);
843
/* Ignore dotfiles, backup files and other junk */
845
bool bad_name = false;
847
const char const *bad_prefixes[] = { ".", "#", NULL };
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
852
".dpkg-divert", NULL };
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
854
size_t pre_len = strlen(*pre);
855
if((d_name_len >= pre_len)
856
and strncmp((dirst->d_name), *pre, pre_len) == 0){
858
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
" with bad prefix %s\n", dirst->d_name, *pre);
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
869
size_t suf_len = strlen(*suf);
870
if((d_name_len >= suf_len)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
875
" with bad suffix %s\n", dirst->d_name, *suf);
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
897
error(0, errno, "asprintf");
905
for(int i = 0; i < numplugins; i++){
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
error(0, errno, "Could not open plugin");
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
903
915
error(0, errno, "stat");
908
921
/* Ignore non-executable files */
909
922
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
913
" with bad type or mode\n", filename);
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
919
plugin *p = getplugin(dirst->d_name);
936
plugin *p = getplugin(direntries[i]->d_name);
921
938
error(0, errno, "getplugin");
927
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
962
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
964
986
error(0, errno, "pipe");
965
987
exitstatus = EX_OSERR;
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
996
exitstatus = EX_OSERR;
968
1001
/* Ask OS to automatic close the pipe on exec */
969
1002
ret = set_cloexec_flag(pipefd[0]);
971
1004
error(0, errno, "set_cloexec_flag");
972
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
975
1011
ret = set_cloexec_flag(pipefd[1]);
977
1013
error(0, errno, "set_cloexec_flag");
978
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1020
#endif /* not O_CLOEXEC */
981
1021
/* Block SIGCHLD until process is safely in process list */
982
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
1023
&sigchld_action.sa_mask,
1016
1062
_exit(EX_OSERR);
1020
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1021
above and must now close it manually here. */
1024
if(p->environ[0] == NULL){
1025
if(execv(filename, p->argv) < 0){
1026
error(0, errno, "execv for %s", filename);
1030
if(execve(filename, p->argv, p->environ) < 0){
1031
error(0, errno, "execve for %s", filename);
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1035
1072
/* no return */
1037
1074
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1041
plugin *new_plugin = getplugin(dirst->d_name);
1075
close(pipefd[1]); /* Close unused write end of pipe */
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
1042
1078
if(new_plugin == NULL){
1043
1079
error(0, errno, "getplugin");
1044
1080
ret = (int)(TEMP_FAILURE_RETRY
1175
1210
/* This process has not completed. Does it have any output? */
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1211
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1179
1212
/* This process had nothing to say at this time */
1180
1213
proc = proc->next;
1183
1216
/* Before reading, make the process' data buffer large enough */
1184
1217
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
1186
+ (size_t) BUFFER_SIZE);
1187
if(proc->buffer == NULL){
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1188
1221
error(0, errno, "malloc");
1189
1222
exitstatus = EX_OSERR;
1225
proc->buffer = new_buffer;
1192
1226
proc->buffer_size += BUFFER_SIZE;
1194
1228
/* Read from the process */