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 */
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#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
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stat, waitpid(), WIFEXITED(),
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WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
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40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG(),
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
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#include <iso646.h> /* and, or, not */
45
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
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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
execve(), write(), read(),
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
54
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
58
58
#include <errno.h> /* errno */
59
59
#include <argp.h> /* struct argp_option, struct
60
60
argp_state, struct argp,
779
780
<http://bugs.debian.org/633582> */
780
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
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if(plugindir_fd == -1){
782
error(0, errno, "open(\"" PDIR "\")");
784
error(0, errno, "open(\"" PDIR "\")");
784
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
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812
/* Open plugin directory with close_on_exec flag */
812
if(plugindir == NULL){
813
dir_fd = open(PDIR, O_RDONLY |
816
#else /* not O_CLOEXEC */
818
#endif /* not O_CLOEXEC */
821
dir_fd = open(plugindir, O_RDONLY |
824
#else /* not O_CLOEXEC */
826
#endif /* not O_CLOEXEC */
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
817
#else /* not O_CLOEXEC */
819
#endif /* not O_CLOEXEC */
829
821
if(dir_fd == -1){
830
822
error(0, errno, "Could not open plugin dir");
831
823
exitstatus = EX_UNAVAILABLE;
936
if(plugindir == NULL){
937
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
940
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
927
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
930
#else /* not O_CLOEXEC */
932
#endif /* not O_CLOEXEC */
935
error(0, errno, "Could not open plugin");
939
/* Set the FD_CLOEXEC flag on the plugin FD */
940
ret = set_cloexec_flag(plugin_fd);
945
error(0, errno, "asprintf");
942
error(0, errno, "set_cloexec_flag");
943
TEMP_FAILURE_RETRY(close(plugin_fd));
949
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
946
#endif /* O_CLOEXEC */
947
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
951
949
error(0, errno, "stat");
950
TEMP_FAILURE_RETRY(close(plugin_fd));
956
954
/* Ignore non-executable files */
957
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if(not S_ISREG(st.st_mode)
958
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
956
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
960
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
961
" with bad type or mode\n", filename);
959
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
960
" with bad type or mode\n",
961
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
963
TEMP_FAILURE_RETRY(close(plugin_fd));
967
967
plugin *p = getplugin(dirst->d_name);
969
969
error(0, errno, "getplugin");
970
TEMP_FAILURE_RETRY(close(plugin_fd));
998
/* If this plugin has any environment variables, we will call
999
using execve and need to duplicate the environment from this
998
/* If this plugin has any environment variables, we need to
999
duplicate the environment from this process, too. */
1001
1000
if(p->environ[0] != NULL){
1002
1001
for(char **e = environ; *e != NULL; e++){
1003
1002
if(not add_environment(p, *e, false)){
1069
1068
above and must now close it manually here. */
1072
if(execve(filename, p->argv,
1071
if(fexecve(plugin_fd, p->argv,
1073
1072
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1074
error(0, errno, "execve for %s", filename);
1073
error(0, errno, "fexecve for %s/%s",
1074
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1075
1075
_exit(EX_OSERR);
1077
1077
/* no return */