char *buffer, size_t buflen, int *errnop);
-static service_user *
-nss_group_nonlocal_database(void)
+static service_user *__nss_group_nonlocal_database;
+
+static int
+internal_function
+__nss_group_nonlocal_lookup(service_user **ni, const char *fct_name,
+ void **fctp)
{
- static service_user *nip = NULL;
- if (nip == NULL)
- __nss_database_lookup("group_nonlocal", NULL, "", &nip);
+ if (__nss_group_nonlocal_database == NULL
+ && __nss_database_lookup("group_nonlocal", NULL, NULL,
+ &__nss_group_nonlocal_database) < 0)
+ return -1;
+
+ *ni = __nss_group_nonlocal_database;
- return nip;
+ *fctp = __nss_lookup_function(*ni, fct_name);
+ return 0;
}
enum nss_status
check_nonlocal_gid(const char *user, gid_t gid, int *errnop)
{
- static const char *fct_name = "getgrgid_r";
- static service_user *startp = NULL;
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(gid_t gid, struct group *grp,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
struct group gbuf;
- int old_errno = errno;
-
+ char *buf;
size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
- char *buf = malloc(buflen);
- errno = old_errno;
- if (buf == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
-
- if (fct_start == NULL &&
- __nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
- free(buf);
- return NSS_STATUS_UNAVAIL;
- }
- nip = startp;
- fct.ptr = fct_start;
- do {
- morebuf:
- if (fct.l == _nss_nonlocal_getgrgid_r)
- status = NSS_STATUS_NOTFOUND;
- else
- status = DL_CALL_FCT(fct.l, (gid, &gbuf, buf, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
- free(buf);
- buflen *= 2;
- buf = malloc(buflen);
- errno = old_errno;
- if (buf == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
- goto morebuf;
- }
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+ const struct walk_nss w = {
+ .lookup = &__nss_group_lookup, .fct_name = "getgrgid_r",
+ .status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
+ };
+ const __typeof__(&_nss_nonlocal_getgrgid_r) self = &_nss_nonlocal_getgrgid_r;
+#define args (gid, &gbuf, buf, buflen, errnop)
+#include "walk_nss.h"
+#undef args
if (status == NSS_STATUS_SUCCESS) {
syslog(LOG_DEBUG, "nss_nonlocal: removing local group %u (%s) from non-local user %s\n", gbuf.gr_gid, gbuf.gr_name, user);
+ free(buf);
status = NSS_STATUS_NOTFOUND;
} else if (status != NSS_STATUS_TRYAGAIN) {
status = NSS_STATUS_SUCCESS;
}
- free(buf);
return status;
}
enum nss_status
get_local_group(const char *name, struct group *grp, char **buffer, int *errnop)
{
- static const char *fct_name = "getgrnam_r";
- static service_user *startp = NULL;
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(const char *name, struct group *grp,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
- size_t buflen;
- int old_errno = errno;
-
- buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
- *buffer = malloc(buflen);
- errno = old_errno;
- if (*buffer == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
-
- if (fct_start == NULL &&
- __nss_group_lookup(&startp, fct_name, &fct_start) != 0) {
- free(*buffer);
- *buffer = NULL;
- return NSS_STATUS_UNAVAIL;
- }
- nip = startp;
- fct.ptr = fct_start;
- do {
- morebuf:
- if (fct.l == _nss_nonlocal_getgrnam_r)
- status = NSS_STATUS_NOTFOUND;
- else
- status = DL_CALL_FCT(fct.l, (name, grp, *buffer, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
- free(*buffer);
- buflen *= 2;
- *buffer = malloc(buflen);
- errno = old_errno;
- if (*buffer == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
- goto morebuf;
- }
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
-
- if (status != NSS_STATUS_SUCCESS) {
- free(*buffer);
- *buffer = NULL;
- }
-
+ size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
+ const struct walk_nss w = {
+ .lookup = &__nss_group_lookup, .fct_name = "getgrnam_r",
+ .status = &status, .errnop = errnop, .buf = buffer, .buflen = &buflen
+ };
+ const __typeof__(&_nss_nonlocal_getgrnam_r) self = &_nss_nonlocal_getgrnam_r;
+#define args (name, grp, *buffer, buflen, errnop)
+#include "walk_nss.h"
+#undef args
return status;
}
-static service_user *grent_nip = NULL;
+static service_user *grent_startp, *grent_nip;
static void *grent_fct_start;
static union {
enum nss_status (*l)(struct group *grp, char *buffer, size_t buflen,
enum nss_status
_nss_nonlocal_setgrent(int stayopen)
{
- static const char *fct_name = "setgrent";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(int stayopen);
- void *ptr;
- } fct;
-
- nip = nss_group_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (stayopen));
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+ const struct walk_nss w = {
+ .lookup = &__nss_group_nonlocal_lookup, .fct_name = "setgrent",
+ .status = &status
+ };
+ const __typeof__(&_nss_nonlocal_setgrent) self = NULL;
+#define args (stayopen)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
- grent_nip = nip;
if (grent_fct_start == NULL)
- grent_fct_start = __nss_lookup_function(nip, grent_fct_name);
+ __nss_group_nonlocal_lookup(&grent_startp, grent_fct_name,
+ &grent_fct_start);
+ grent_nip = grent_startp;
grent_fct.ptr = grent_fct_start;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nonlocal_endgrent(void)
{
- static const char *fct_name = "endgrent";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(void);
- void *ptr;
- } fct;
+ const struct walk_nss w = {
+ .lookup = &__nss_group_nonlocal_lookup, .fct_name = "endgrent",
+ .status = &status
+ };
+ const __typeof__(&_nss_nonlocal_endgrent) self = NULL;
grent_nip = NULL;
- nip = nss_group_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, ());
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args ()
+#include "walk_nss.h"
+#undef args
return status;
}
_nss_nonlocal_getgrnam_r(const char *name, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
- static const char *fct_name = "getgrnam_r";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(const char *name, struct group *grp,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
+ const struct walk_nss w = {
+ .lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrnam_r",
+ .status = &status, .errnop = errnop
+ };
+ const __typeof__(&_nss_nonlocal_getgrnam_r) self = NULL;
char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
return NSS_STATUS_UNAVAIL;
- nip = nss_group_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (name, grp, buffer, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
- break;
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args (name, grp, buffer, buflen, errnop)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
_nss_nonlocal_getgrgid_r(gid_t gid, struct group *grp,
char *buffer, size_t buflen, int *errnop)
{
- static const char *fct_name = "getgrgid_r";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(gid_t gid, struct group *grp,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
+ const struct walk_nss w = {
+ .lookup = &__nss_group_nonlocal_lookup, .fct_name = "getgrgid_r",
+ .status = &status, .errnop = errnop
+ };
+ const __typeof__(&_nss_nonlocal_getgrgid_r) self = NULL;
char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
return NSS_STATUS_UNAVAIL;
- nip = nss_group_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (gid, grp, buffer, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
- break;
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args (gid, grp, buffer, buflen, errnop)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
long int *size, gid_t **groupsp, long int limit,
int *errnop)
{
- static const char *fct_name = "initgroups_dyn";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(const char *user, gid_t group, long int *start,
- long int *size, gid_t **groupsp, long int limit,
- int *errnop);
- void *ptr;
- } fct;
+ const struct walk_nss w = {
+ .lookup = &__nss_group_nonlocal_lookup, .fct_name = "initgroups_dyn",
+ .status = &status, .errnop = errnop
+ };
+ const __typeof__(&_nss_nonlocal_initgroups_dyn) self = NULL;
struct group local_users_group, nonlocal_users_group;
gid_t local_users_gid, gid;
in = out = *start;
- nip = nss_group_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
-
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (user, group, start, size, groupsp, limit, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
- break;
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args (user, group, start, size, groupsp, limit, errnop)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
char *buffer, size_t buflen, int *errnop);
-static service_user *
-nss_passwd_nonlocal_database(void)
+static service_user *__nss_passwd_nonlocal_database;
+
+static int
+internal_function
+__nss_passwd_nonlocal_lookup(service_user **ni, const char *fct_name,
+ void **fctp)
{
- static service_user *nip = NULL;
- if (nip == NULL)
- __nss_database_lookup("passwd_nonlocal", NULL, "", &nip);
+ if (__nss_passwd_nonlocal_database == NULL
+ && __nss_database_lookup("passwd_nonlocal", NULL, NULL,
+ &__nss_passwd_nonlocal_database) < 0)
+ return -1;
+
+ *ni = __nss_passwd_nonlocal_database;
- return nip;
+ *fctp = __nss_lookup_function(*ni, fct_name);
+ return 0;
}
enum nss_status
check_nonlocal_uid(const char *user, uid_t uid, int *errnop)
{
- static const char *fct_name = "getpwuid_r";
- static service_user *startp = NULL;
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(uid_t uid, struct passwd *pwd,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
struct passwd pwbuf;
- int old_errno = errno;
-
+ char *buf;
size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
- char *buf = malloc(buflen);
- errno = old_errno;
- if (buf == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
-
- if (fct_start == NULL &&
- __nss_passwd_lookup(&startp, fct_name, &fct_start) != 0) {
- free(buf);
- return NSS_STATUS_UNAVAIL;
- }
- nip = startp;
- fct.ptr = fct_start;
- do {
- morebuf:
- if (fct.l == _nss_nonlocal_getpwuid_r)
- status = NSS_STATUS_NOTFOUND;
- else
- status = DL_CALL_FCT(fct.l, (uid, &pwbuf, buf, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
- free(buf);
- buflen *= 2;
- buf = malloc(buflen);
- errno = old_errno;
- if (buf == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
- goto morebuf;
- }
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+ const struct walk_nss w = {
+ .lookup = &__nss_passwd_lookup, .fct_name = "getpwuid_r",
+ .status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
+ };
+ const __typeof__(&_nss_nonlocal_getpwuid_r) self = &_nss_nonlocal_getpwuid_r;
+#define args (uid, &pwbuf, buf, buflen, errnop)
+#include "walk_nss.h"
+#undef args
if (status == NSS_STATUS_SUCCESS) {
syslog(LOG_ERR, "nss_nonlocal: possible spoofing attack: non-local user %s has same UID as local user %s!\n", user, pwbuf.pw_name);
+ free(buf);
status = NSS_STATUS_NOTFOUND;
} else if (status != NSS_STATUS_TRYAGAIN) {
status = NSS_STATUS_SUCCESS;
}
- free(buf);
return status;
}
enum nss_status
check_nonlocal_user(const char *user, int *errnop)
{
- static const char *fct_name = "getpwnam_r";
- static service_user *startp = NULL;
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(const char *name, struct passwd *pwd,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
struct passwd pwbuf;
- int old_errno = errno;
-
+ char *buf;
size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
- char *buf = malloc(buflen);
- errno = old_errno;
- if (buf == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
+ const struct walk_nss w = {
+ .lookup = __nss_passwd_lookup, .fct_name = "getpwnam_r",
+ .status = &status, .errnop = errnop, .buf = &buf, .buflen = &buflen
+ };
+ const __typeof__(&_nss_nonlocal_getpwnam_r) self = &_nss_nonlocal_getpwnam_r;
+#define args (user, &pwbuf, buf, buflen, errnop)
+#include "walk_nss.h"
+#undef args
- if (fct_start == NULL &&
- __nss_passwd_lookup(&startp, fct_name, &fct_start) != 0) {
+ if (status == NSS_STATUS_SUCCESS) {
free(buf);
- return NSS_STATUS_UNAVAIL;
- }
- nip = startp;
- fct.ptr = fct_start;
- do {
- morebuf:
- if (fct.l == _nss_nonlocal_getpwnam_r)
- status = NSS_STATUS_NOTFOUND;
- else
- status = DL_CALL_FCT(fct.l, (user, &pwbuf, buf, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE) {
- free(buf);
- buflen *= 2;
- buf = malloc(buflen);
- errno = old_errno;
- if (buf == NULL) {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
- goto morebuf;
- }
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
-
- if (status == NSS_STATUS_SUCCESS)
status = NSS_STATUS_NOTFOUND;
- else if (status != NSS_STATUS_TRYAGAIN)
+ } else if (status != NSS_STATUS_TRYAGAIN) {
status = NSS_STATUS_SUCCESS;
+ }
- free(buf);
return status;
}
-static service_user *pwent_nip = NULL;
+static service_user *pwent_startp, *pwent_nip;
static void *pwent_fct_start;
static union {
enum nss_status (*l)(struct passwd *pwd, char *buffer, size_t buflen,
enum nss_status
_nss_nonlocal_setpwent(int stayopen)
{
- static const char *fct_name = "setpwent";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(int stayopen);
- void *ptr;
- } fct;
-
- nip = nss_passwd_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (stayopen));
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+ const struct walk_nss w = {
+ .lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "setpwent",
+ .status = &status
+ };
+ const __typeof__(&_nss_nonlocal_setpwent) self = NULL;
+#define args (stayopen)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
- pwent_nip = nip;
if (pwent_fct_start == NULL)
- pwent_fct_start = __nss_lookup_function(nip, pwent_fct_name);
+ __nss_passwd_nonlocal_lookup(&pwent_startp, pwent_fct_name,
+ &pwent_fct_start);
+ pwent_nip = pwent_startp;
pwent_fct.ptr = pwent_fct_start;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nonlocal_endpwent(void)
{
- static const char *fct_name = "endpwent";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(void);
- void *ptr;
- } fct;
+ const struct walk_nss w = {
+ .lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "endpwent",
+ .status = &status
+ };
+ const __typeof__(&_nss_nonlocal_endpwent) self = NULL;
pwent_nip = NULL;
- nip = nss_passwd_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, ());
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args ()
+#include "walk_nss.h"
+#undef args
return status;
}
_nss_nonlocal_getpwnam_r(const char *name, struct passwd *pwd,
char *buffer, size_t buflen, int *errnop)
{
- static const char *fct_name = "getpwnam_r";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(const char *name, struct passwd *pwd,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
int group_errno;
+ const struct walk_nss w = {
+ .lookup = __nss_passwd_nonlocal_lookup, .fct_name = "getpwnam_r",
+ .status = &status, .errnop = errnop
+ };
+ const __typeof__(&_nss_nonlocal_getpwnam_r) self = NULL;
char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
return NSS_STATUS_UNAVAIL;
- nip = nss_passwd_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
- break;
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args (name, pwd, buffer, buflen, errnop)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
_nss_nonlocal_getpwuid_r(uid_t uid, struct passwd *pwd,
char *buffer, size_t buflen, int *errnop)
{
- static const char *fct_name = "getpwuid_r";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(uid_t uid, struct passwd *pwd,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
int group_errno;
+ const struct walk_nss w = {
+ .lookup = &__nss_passwd_nonlocal_lookup, .fct_name = "getpwuid_r",
+ .status = &status, .errnop = errnop
+ };
+ const __typeof__(&_nss_nonlocal_getpwuid_r) self = NULL;
char *nonlocal_ignore = getenv(NONLOCAL_IGNORE_ENV);
if (nonlocal_ignore != NULL && nonlocal_ignore[0] != '\0')
return NSS_STATUS_UNAVAIL;
- nip = nss_passwd_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (uid, pwd, buffer, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
- break;
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args (uid, pwd, buffer, buflen, errnop)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
#include "nonlocal.h"
-static service_user *
-nss_shadow_nonlocal_database(void)
+static service_user *__nss_shadow_nonlocal_database;
+
+static int
+internal_function
+__nss_shadow_nonlocal_lookup(service_user **ni, const char *fct_name,
+ void **fctp)
{
- static service_user *nip = NULL;
- if (nip == NULL)
- __nss_database_lookup("shadow_nonlocal", NULL, "", &nip);
+ if (__nss_shadow_nonlocal_database == NULL
+ && __nss_database_lookup("shadow_nonlocal", NULL, NULL,
+ &__nss_shadow_nonlocal_database) < 0)
+ return -1;
+
+ *ni = __nss_shadow_nonlocal_database;
- return nip;
+ *fctp = __nss_lookup_function(*ni, fct_name);
+ return 0;
}
-static service_user *spent_nip = NULL;
+static service_user *spent_startp, *spent_nip;
static void *spent_fct_start;
static union {
enum nss_status (*l)(struct spwd *pwd, char *buffer, size_t buflen,
enum nss_status
_nss_nonlocal_setspent(int stayopen)
{
- static const char *fct_name = "setspent";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(int stayopen);
- void *ptr;
- } fct;
-
- nip = nss_shadow_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (stayopen));
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+ const struct walk_nss w = {
+ .lookup = &__nss_shadow_nonlocal_lookup, .fct_name = "setspent",
+ .status = &status
+ };
+ const __typeof__(&_nss_nonlocal_setspent) self = NULL;
+#define args (stayopen)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
- spent_nip = nip;
if (spent_fct_start == NULL)
- spent_fct_start = __nss_lookup_function(nip, spent_fct_name);
+ __nss_shadow_nonlocal_lookup(&spent_startp, spent_fct_name,
+ &spent_fct_start);
+ spent_nip = spent_startp;
spent_fct.ptr = spent_fct_start;
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nonlocal_endspent(void)
{
- static const char *fct_name = "endspent";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(void);
- void *ptr;
- } fct;
+ const struct walk_nss w = {
+ .lookup = &__nss_shadow_nonlocal_lookup, .fct_name = "endspent",
+ .status = &status
+ };
+ const __typeof__(&_nss_nonlocal_endspent) self = NULL;
spent_nip = NULL;
- nip = nss_shadow_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, ());
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+#define args ()
+#include "walk_nss.h"
+#undef args
return status;
}
_nss_nonlocal_getspnam_r(const char *name, struct spwd *pwd,
char *buffer, size_t buflen, int *errnop)
{
- static const char *fct_name = "getspnam_r";
- static void *fct_start = NULL;
enum nss_status status;
- service_user *nip;
- union {
- enum nss_status (*l)(const char *name, struct spwd *pwd,
- char *buffer, size_t buflen, int *errnop);
- void *ptr;
- } fct;
-
- nip = nss_shadow_nonlocal_database();
- if (nip == NULL)
- return NSS_STATUS_UNAVAIL;
- if (fct_start == NULL)
- fct_start = __nss_lookup_function(nip, fct_name);
- fct.ptr = fct_start;
- do {
- if (fct.ptr == NULL)
- status = NSS_STATUS_UNAVAIL;
- else
- status = DL_CALL_FCT(fct.l, (name, pwd, buffer, buflen, errnop));
- if (status == NSS_STATUS_TRYAGAIN && *errnop == ERANGE)
- break;
- } while (__nss_next(&nip, fct_name, &fct.ptr, status, 0) == 0);
+ const struct walk_nss w = {
+ .lookup = __nss_shadow_nonlocal_lookup, .fct_name = "getspnam_r",
+ .status = &status, .errnop = errnop
+ };
+ const __typeof__(&_nss_nonlocal_getspnam_r) self = NULL;
+#define args (name, pwd, buffer, buflen, errnop)
+#include "walk_nss.h"
+#undef args
if (status != NSS_STATUS_SUCCESS)
return status;
#define NONLOCAL_H
#include "config.h"
+#include "nsswitch-internal.h"
+
+struct walk_nss {
+ enum nss_status *status;
+ int (*lookup)(service_user **ni, const char *fct_name,
+ void **fctp) internal_function;
+ const char *fct_name;
+ int *errnop;
+ char **buf;
+ size_t *buflen;
+};
enum nss_status check_nonlocal_uid(const char *user, uid_t uid, int *errnop);
enum nss_status check_nonlocal_gid(const char *user, gid_t gid, int *errnop);
--- /dev/null
+/*
+ * walk_nss.h
+ * NSS walking template for nss_nonlocal proxy
+ *
+ * Copyright © 2011 Anders Kaseorg <andersk@mit.edu> and Tim Abbott
+ * <tabbott@mit.edu>
+ *
+ * This file is part of nss_nonlocal.
+ *
+ * nss_nonlocal is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * nss_nonlocal is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with nss_nonlocal; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+{
+ static service_user *startp = NULL;
+ static void *fct_start = NULL;
+
+ service_user *nip;
+ union {
+ __typeof__(self) l;
+ void *ptr;
+ } fct;
+ int old_errno = errno;
+
+ if (fct_start == NULL &&
+ w.lookup(&startp, w.fct_name, &fct_start) != 0) {
+ *w.status = NSS_STATUS_UNAVAIL;
+ goto walk_nss_out;
+ }
+
+ nip = startp;
+ fct.ptr = fct_start;
+
+ if (w.buf != NULL) {
+ *w.buf = malloc(*w.buflen);
+ errno = old_errno;
+ if (*w.buf == NULL) {
+ *w.status = NSS_STATUS_TRYAGAIN;
+ *w.errnop = ENOMEM;
+ goto walk_nss_out;
+ }
+ }
+
+ do {
+ walk_nss_morebuf:
+ if (fct.ptr == NULL)
+ *w.status = NSS_STATUS_UNAVAIL;
+ else if (self != NULL && fct.l == self)
+ *w.status = NSS_STATUS_NOTFOUND;
+ else
+ *w.status = DL_CALL_FCT(fct.l, args);
+ if (*w.status == NSS_STATUS_TRYAGAIN &&
+ w.errnop != NULL && *w.errnop == ERANGE) {
+ if (w.buf == NULL)
+ break;
+ free(*w.buf);
+ *w.buflen *= 2;
+ *w.buf = malloc(*w.buflen);
+ errno = old_errno;
+ if (*w.buf == NULL) {
+ *w.errnop = ENOMEM;
+ goto walk_nss_out;
+ }
+ goto walk_nss_morebuf;
+ }
+ } while (__nss_next(&nip, w.fct_name, &fct.ptr, *w.status, 0) == 0);
+
+ if (w.buf != NULL && *w.status != NSS_STATUS_SUCCESS) {
+ free(*w.buf);
+ *w.buf = NULL;
+ }
+
+ walk_nss_out:
+ ;
+}
andersk / nss_nonlocal.git / commitdiff
