25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
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
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
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(),
40
WEXITSTATUS(), WTERMSIG() */
43
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() */
43
#include <dirent.h> /* struct dirent, scandirat() */
47
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
45
FD_CLOEXEC, write(), STDOUT_FILENO,
49
46
struct stat, fstat(), close(),
50
47
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
48
faccessat() pipe2(), fork(),
52
49
_exit(), dup2(), fexecve(), read()
54
51
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC, openat() */
52
FD_CLOEXEC, openat(), scandirat(),
56
54
#include <string.h> /* strsep, strlen(), strsignal(),
57
55
strcmp(), strncmp() */
58
56
#include <errno.h> /* errno */
829
859
ret = set_cloexec_flag(dir_fd);
831
861
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
862
exitstatus = EX_OSERR;
836
865
#endif /* O_CLOEXEC */
838
dir = fdopendir(dir_fd);
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
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;
847
902
FD_ZERO(&rfds_all);
849
904
/* Read and execute any executable in the plugin directory*/
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
855
/* All directory entries have been processed */
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
865
/* Ignore dotfiles, backup files and other junk */
867
bool bad_name = false;
868
const char * const patterns[] = { ".*", "#*#", "*~",
869
"*.dpkg-new", "*.dpkg-old",
870
"*.dpkg-bak", "*.dpkg-divert",
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, dirst->d_name,
882
FNM_FILE_NAME | FNM_PERIOD) != FNM_NOMATCH){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirst->d_name, *pat);
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
899
#else /* not O_CLOEXEC */
901
#endif /* not O_CLOEXEC */
905
for(int i = 0; i < numplugins; i++){
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
903
908
if(plugin_fd == -1){
904
909
error(0, errno, "Could not open plugin");
908
/* Set the FD_CLOEXEC flag on the plugin FD */
909
ret = set_cloexec_flag(plugin_fd);
911
error(0, errno, "set_cloexec_flag");
912
TEMP_FAILURE_RETRY(close(plugin_fd));
915
#endif /* O_CLOEXEC */
916
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
918
915
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
923
921
/* Ignore non-executable files */
924
922
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
928
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
927
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
936
plugin *p = getplugin(dirst->d_name);
936
plugin *p = getplugin(direntries[i]->d_name);
938
938
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
944
945
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
947
TEMP_FAILURE_RETRY(close(plugin_fd));
978
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 */
980
986
error(0, errno, "pipe");
981
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;
984
1001
/* Ask OS to automatic close the pipe on exec */
985
1002
ret = set_cloexec_flag(pipefd[0]);
987
1004
error(0, errno, "set_cloexec_flag");
988
TEMP_FAILURE_RETRY(close(pipefd[0]));
989
TEMP_FAILURE_RETRY(close(pipefd[1]));
990
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
993
1011
ret = set_cloexec_flag(pipefd[1]);
995
1013
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1020
#endif /* not O_CLOEXEC */
1001
1021
/* Block SIGCHLD until process is safely in process list */
1002
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1003
1023
&sigchld_action.sa_mask,
1040
1062
_exit(EX_OSERR);
1044
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1045
above and must now close it manually here. */
1048
1065
if(fexecve(plugin_fd, p->argv,
1049
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1050
1067
error(0, errno, "fexecve for %s/%s",
1051
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1052
1070
_exit(EX_OSERR);
1054
1072
/* no return */
1056
1074
/* Parent process */
1057
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1059
TEMP_FAILURE_RETRY(close(plugin_fd));
1060
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);
1061
1078
if(new_plugin == NULL){
1062
1079
error(0, errno, "getplugin");
1063
1080
ret = (int)(TEMP_FAILURE_RETRY
1087
#if defined (__GNUC__) and defined (__GLIBC__)
1088
#if not __GLIBC_PREREQ(2, 16)
1089
#pragma GCC diagnostic push
1090
#pragma GCC diagnostic ignored "-Wsign-conversion"
1093
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1094
-Wconversion in GNU libc
1096
#if defined (__GNUC__) and defined (__GLIBC__)
1097
#if not __GLIBC_PREREQ(2, 16)
1098
#pragma GCC diagnostic pop
1106
FD_SET(new_plugin->fd, &rfds_all);
1102
1108
if(maxfd < new_plugin->fd){
1103
1109
maxfd = new_plugin->fd;
1107
TEMP_FAILURE_RETRY(closedir(dir));
1109
1117
free_plugin(getplugin(NULL));
1111
1119
for(plugin *p = plugin_list; p != NULL; p = p->next){
1150
1158
(intmax_t) (proc->pid),
1151
1159
WTERMSIG(proc->status),
1152
1160
strsignal(WTERMSIG(proc->status)));
1153
} else if(WCOREDUMP(proc->status)){
1154
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1155
" core\n", proc->name, (intmax_t) (proc->pid));
1159
1164
/* Remove the plugin */
1160
#if defined (__GNUC__) and defined (__GLIBC__)
1161
#if not __GLIBC_PREREQ(2, 16)
1162
#pragma GCC diagnostic push
1163
#pragma GCC diagnostic ignored "-Wsign-conversion"
1166
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1167
-Wconversion in GNU libc
1169
#if defined (__GNUC__) and defined (__GLIBC__)
1170
#if not __GLIBC_PREREQ(2, 16)
1171
#pragma GCC diagnostic pop
1165
FD_CLR(proc->fd, &rfds_all);
1175
1167
/* Block signal while modifying process_list */
1176
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask