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_SUCCESS,
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#include <stdbool.h> /* bool, true, false */
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#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
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#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
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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(),
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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 <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
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#include <iso646.h> /* and, or, not */
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#include <dirent.h> /* DIR, struct dirent, fdopendir(),
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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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F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
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dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
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setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_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(),
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strsignal(), strcmp(), strncmp() */
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FD_CLOEXEC, openat(), scandirat(),
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#include <string.h> /* strsep, strlen(), strsignal(),
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strcmp(), strncmp() */
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#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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ret = set_cloexec_flag(dir_fd);
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error(0, errno, "set_cloexec_flag");
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TEMP_FAILURE_RETRY(close(dir_fd));
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exitstatus = EX_OSERR;
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#endif /* O_CLOEXEC */
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dir = fdopendir(dir_fd);
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error(0, errno, "Could not open plugin dir");
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TEMP_FAILURE_RETRY(close(dir_fd));
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exitstatus = EX_OSERR;
870
int good_name(const struct dirent * const dirent){
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const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
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"*.dpkg-old", "*.dpkg-bak",
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"*.dpkg-divert", NULL };
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-qual"
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for(const char **pat = (const char **)patterns;
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*pat != NULL; pat++){
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#pragma GCC diagnostic pop
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if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
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fprintf(stderr, "Ignoring plugin dir entry \"%s\""
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" matching pattern %s\n", dirent->d_name, *pat);
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#if __GLIBC_PREREQ(2, 15)
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int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
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#else /* not __GLIBC_PREREQ(2, 15) */
900
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
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&direntries, good_name, alphasort);
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#endif /* not __GLIBC_PREREQ(2, 15) */
903
#else /* not __GLIBC__ */
904
int numplugins = scandir(plugindir != NULL ? plugindir : PDIR,
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&direntries, good_name, alphasort);
906
#endif /* not __GLIBC__ */
907
if(numplugins == -1){
908
error(0, errno, "Could not scan plugin dir");
910
exitstatus = EX_OSERR;
855
914
FD_ZERO(&rfds_all);
857
916
/* Read and execute any executable in the plugin directory*/
860
dirst = readdir(dir);
861
} while(dirst == NULL and errno == EINTR);
863
/* All directory entries have been processed */
866
error(0, errno, "readdir");
867
exitstatus = EX_IOERR;
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d_name_len = strlen(dirst->d_name);
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/* Ignore dotfiles, backup files and other junk */
877
bool bad_name = false;
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const char * const bad_prefixes[] = { ".", "#", NULL };
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const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
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".dpkg-divert", NULL };
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wcast-qual"
889
for(const char **pre = (const char **)bad_prefixes;
890
*pre != NULL; pre++){
892
#pragma GCC diagnostic pop
894
size_t pre_len = strlen(*pre);
895
if((d_name_len >= pre_len)
896
and strncmp((dirst->d_name), *pre, pre_len) == 0){
898
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
899
" with bad prefix %s\n", dirst->d_name, *pre);
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#pragma GCC diagnostic push
910
#pragma GCC diagnostic ignored "-Wcast-qual"
912
for(const char **suf = (const char **)bad_suffixes;
913
*suf != NULL; suf++){
915
#pragma GCC diagnostic pop
917
size_t suf_len = strlen(*suf);
918
if((d_name_len >= suf_len)
919
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
922
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
923
" with bad suffix %s\n", dirst->d_name, *suf);
936
if(plugindir == NULL){
937
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
940
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
945
error(0, errno, "asprintf");
917
for(int i = 0; i < numplugins; i++){
919
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
921
error(0, errno, "Could not open plugin");
949
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
925
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
951
927
error(0, errno, "stat");
928
TEMP_FAILURE_RETRY(close(plugin_fd));
956
933
/* Ignore non-executable files */
957
934
if(not S_ISREG(st.st_mode)
958
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
935
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
960
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
961
" with bad type or mode\n", filename);
938
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
939
" with bad type or mode\n",
940
plugindir != NULL ? plugindir : PDIR,
941
direntries[i]->d_name);
943
TEMP_FAILURE_RETRY(close(plugin_fd));
967
plugin *p = getplugin(dirst->d_name);
948
plugin *p = getplugin(direntries[i]->d_name);
969
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error(0, errno, "getplugin");
951
TEMP_FAILURE_RETRY(close(plugin_fd));
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fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
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direntries[i]->d_name);
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TEMP_FAILURE_RETRY(close(plugin_fd));
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ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
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#else /* O_CLOEXEC */
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ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
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#endif /* O_CLOEXEC */
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error(0, errno, "pipe");
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exitstatus = EX_OSERR;
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free(direntries[i]);
1003
if(pipefd[0] >= FD_SETSIZE){
1004
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1006
TEMP_FAILURE_RETRY(close(pipefd[0]));
1007
TEMP_FAILURE_RETRY(close(pipefd[1]));
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exitstatus = EX_OSERR;
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free(direntries[i]);
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/* Ask OS to automatic close the pipe on exec */
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ret = set_cloexec_flag(pipefd[0]);
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error(0, errno, "set_cloexec_flag");
1017
TEMP_FAILURE_RETRY(close(pipefd[0]));
1018
TEMP_FAILURE_RETRY(close(pipefd[1]));
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1019
exitstatus = EX_OSERR;
1020
free(direntries[i]);
1023
1023
ret = set_cloexec_flag(pipefd[1]);
1025
1025
error(0, errno, "set_cloexec_flag");
1026
TEMP_FAILURE_RETRY(close(pipefd[0]));
1027
TEMP_FAILURE_RETRY(close(pipefd[1]));
1026
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
1032
#endif /* not O_CLOEXEC */
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1033
/* Block SIGCHLD until process is safely in process list */
1030
1034
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1031
1035
&sigchld_action.sa_mask,
1064
1074
_exit(EX_OSERR);
1068
/* If dir has no file descriptor, we could not set FD_CLOEXEC
1069
above and must now close it manually here. */
1072
if(p->environ[0] == NULL){
1073
if(execv(filename, p->argv) < 0){
1074
error(0, errno, "execv for %s", filename);
1078
if(execve(filename, p->argv, p->environ) < 0){
1079
error(0, errno, "execve for %s", filename);
1077
if(fexecve(plugin_fd, p->argv,
1078
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1079
error(0, errno, "fexecve for %s/%s",
1080
plugindir != NULL ? plugindir : PDIR,
1081
direntries[i]->d_name);
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1084
/* no return */
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1086
/* Parent process */
1086
1087
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1089
plugin *new_plugin = getplugin(dirst->d_name);
1089
TEMP_FAILURE_RETRY(close(plugin_fd));
1090
plugin *new_plugin = getplugin(direntries[i]->d_name);
1090
1091
if(new_plugin == NULL){
1091
1092
error(0, errno, "getplugin");
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1093
ret = (int)(TEMP_FAILURE_RETRY