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#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
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27
#include <stddef.h> /* size_t, NULL */
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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(),
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stderr, STDOUT_FILENO, fclose() */
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#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
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stderr, STDOUT_FILENO */
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#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
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stat, waitpid(), WIFEXITED(),
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WEXITSTATUS(), wait(), pid_t,
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uid_t, gid_t, getuid(), getgid(),
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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, fstat(), S_ISREG() */
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#include <sys/stat.h> /* struct stat, stat(), 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> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, write(), STDOUT_FILENO,
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struct stat, fstat(), close(),
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setgid(), setuid(), S_ISREG(),
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faccessat() pipe(), fork(),
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_exit(), dup2(), fexecve(), read()
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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,
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access(), pipe(), fork(), close()
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dup2(), STDOUT_FILENO, _exit(),
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execv(), write(), read(),
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#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
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FD_CLOEXEC, openat() */
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#include <string.h> /* strsep, strlen(), strsignal(),
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strcmp(), strncmp() */
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#include <string.h> /* strsep, strlen(), asprintf(),
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strsignal(), 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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791
/* Open plugin directory with close_on_exec flag */
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dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
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#else /* not O_CLOEXEC */
819
#endif /* not O_CLOEXEC */
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if(plugindir == NULL){
795
dir_fd = open(PDIR, O_RDONLY |
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#else /* not O_CLOEXEC */
800
#endif /* not O_CLOEXEC */
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dir_fd = open(plugindir, O_RDONLY |
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#else /* not O_CLOEXEC */
808
#endif /* not O_CLOEXEC */
821
811
if(dir_fd == -1){
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error(0, errno, "Could not open plugin dir");
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813
exitstatus = EX_UNAVAILABLE;
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d_name_len = strlen(dirst->d_name);
865
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/* Ignore dotfiles, backup files and other junk */
867
859
bool bad_name = false;
868
const char * const patterns[] = { ".*", "#*#", "*~",
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"*.dpkg-new", "*.dpkg-old",
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"*.dpkg-bak", "*.dpkg-divert",
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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;
877
*pat != NULL; pat++){
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#pragma GCC diagnostic pop
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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);
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const char * const bad_prefixes[] = { ".", "#", NULL };
863
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
866
".dpkg-divert", NULL };
868
#pragma GCC diagnostic push
869
#pragma GCC diagnostic ignored "-Wcast-qual"
871
for(const char **pre = (const char **)bad_prefixes;
872
*pre != NULL; pre++){
874
#pragma GCC diagnostic pop
876
size_t pre_len = strlen(*pre);
877
if((d_name_len >= pre_len)
878
and strncmp((dirst->d_name), *pre, pre_len) == 0){
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
881
" with bad prefix %s\n", dirst->d_name, *pre);
891
#pragma GCC diagnostic push
892
#pragma GCC diagnostic ignored "-Wcast-qual"
894
for(const char **suf = (const char **)bad_suffixes;
895
*suf != NULL; suf++){
897
#pragma GCC diagnostic pop
899
size_t suf_len = strlen(*suf);
900
if((d_name_len >= suf_len)
901
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
904
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
905
" with bad suffix %s\n", dirst->d_name, *suf);
896
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
899
#else /* not O_CLOEXEC */
901
#endif /* not O_CLOEXEC */
904
error(0, errno, "Could not open plugin");
918
if(plugindir == NULL){
919
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
922
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
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));
927
error(0, errno, "asprintf");
915
#endif /* O_CLOEXEC */
916
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
931
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
918
933
error(0, errno, "stat");
919
TEMP_FAILURE_RETRY(close(plugin_fd));
923
938
/* Ignore non-executable files */
924
939
if(not S_ISREG(st.st_mode)
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
940
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
942
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
943
" with bad type or mode\n", filename);
932
TEMP_FAILURE_RETRY(close(plugin_fd));
936
949
plugin *p = getplugin(dirst->d_name);
938
951
error(0, errno, "getplugin");
939
TEMP_FAILURE_RETRY(close(plugin_fd));
981
995
exitstatus = EX_OSERR;
984
if(pipefd[0] >= FD_SETSIZE){
985
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
987
TEMP_FAILURE_RETRY(close(pipefd[0]));
988
TEMP_FAILURE_RETRY(close(pipefd[1]));
989
exitstatus = EX_OSERR;
992
998
/* Ask OS to automatic close the pipe on exec */
993
999
ret = set_cloexec_flag(pipefd[0]);
995
1001
error(0, errno, "set_cloexec_flag");
996
TEMP_FAILURE_RETRY(close(pipefd[0]));
997
TEMP_FAILURE_RETRY(close(pipefd[1]));
998
1002
exitstatus = EX_OSERR;
1001
1005
ret = set_cloexec_flag(pipefd[1]);
1003
1007
error(0, errno, "set_cloexec_flag");
1004
TEMP_FAILURE_RETRY(close(pipefd[0]));
1005
TEMP_FAILURE_RETRY(close(pipefd[1]));
1006
1008
exitstatus = EX_OSERR;
1053
1051
above and must now close it manually here. */
1056
if(fexecve(plugin_fd, p->argv,
1057
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1058
error(0, errno, "fexecve for %s/%s",
1059
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1054
if(p->environ[0] == NULL){
1055
if(execv(filename, p->argv) < 0){
1056
error(0, errno, "execv for %s", filename);
1060
if(execve(filename, p->argv, p->environ) < 0){
1061
error(0, errno, "execve for %s", filename);
1062
1065
/* no return */
1064
1067
/* Parent process */
1065
1068
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1067
TEMP_FAILURE_RETRY(close(plugin_fd));
1068
1071
plugin *new_plugin = getplugin(dirst->d_name);
1069
1072
if(new_plugin == NULL){
1070
1073
error(0, errno, "getplugin");