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authorGünther Deschner <gd@samba.org>2009-06-04 11:59:32 +0200
committerGünther Deschner <gd@samba.org>2009-06-05 23:04:10 +0200
commit6985f3995f74d081cb8f2256a1c6fc2d80166713 (patch)
tree8324407474740f987fda59ea33de68bc814f4e2e /lib/nss_wrapper
parent47b5a55239fe21e24d47ce56e752a0ee328b697f (diff)
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nss_wrapper: add capability to load nss modules.
Guenther
Diffstat (limited to 'lib/nss_wrapper')
-rw-r--r--lib/nss_wrapper/nss_wrapper.c116
1 files changed, 115 insertions, 1 deletions
diff --git a/lib/nss_wrapper/nss_wrapper.c b/lib/nss_wrapper/nss_wrapper.c
index cffa04401f..a2cd0ac52e 100644
--- a/lib/nss_wrapper/nss_wrapper.c
+++ b/lib/nss_wrapper/nss_wrapper.c
@@ -37,6 +37,7 @@
#include "../replace/replace.h"
#include "system/passwd.h"
#include "system/filesys.h"
+#include "../nsswitch/nsstest.h"
#else /* _SAMBA_BUILD_ */
@@ -139,9 +140,33 @@
#define NWRAP_VERBOSE(args)
#endif
+struct nwrap_module_nss_fns {
+ NSS_STATUS (*_nss_getpwnam_r)(const char *name, struct passwd *result, char *buffer,
+ size_t buflen, int *errnop);
+ NSS_STATUS (*_nss_getpwuid_r)(uid_t uid, struct passwd *result, char *buffer,
+ size_t buflen, int *errnop);
+ NSS_STATUS (*_nss_setpwent)(void);
+ NSS_STATUS (*_nss_getpwent_r)(struct passwd *result, char *buffer,
+ size_t buflen, int *errnop);
+ NSS_STATUS (*_nss_endpwent)(void);
+ NSS_STATUS (*_nss_initgroups)(const char *user, gid_t group, long int *start,
+ long int *size, gid_t **groups, long int limit, int *errnop);
+ NSS_STATUS (*_nss_getgrnam_r)(const char *name, struct group *result, char *buffer,
+ size_t buflen, int *errnop);
+ NSS_STATUS (*_nss_getgrgid_r)(gid_t gid, struct group *result, char *buffer,
+ size_t buflen, int *errnop);
+ NSS_STATUS (*_nss_setgrent)(void);
+ NSS_STATUS (*_nss_getgrent_r)(struct group *result, char *buffer,
+ size_t buflen, int *errnop);
+ NSS_STATUS (*_nss_endgrent)(void);
+};
+
struct nwrap_backend {
const char *name;
+ const char *so_path;
+ void *so_handle;
struct nwrap_ops *ops;
+ struct nwrap_module_nss_fns *fns;
};
struct nwrap_ops {
@@ -286,8 +311,94 @@ struct nwrap_gr nwrap_gr_global;
static bool nwrap_gr_parse_line(struct nwrap_cache *nwrap, char *line);
static void nwrap_gr_unload(struct nwrap_cache *nwrap);
+static void *nwrap_load_module_fn(struct nwrap_backend *b,
+ const char *fn_name)
+{
+ void *res;
+ char *s;
+
+ if (!b->so_handle) {
+ NWRAP_ERROR(("%s: no handle\n",
+ __location__));
+ return NULL;
+ }
+
+ if (asprintf(&s, "_nss_%s_%s", b->name, fn_name) == -1) {
+ NWRAP_ERROR(("%s: out of memory\n",
+ __location__));
+ return NULL;
+ }
+
+ res = dlsym(b->so_handle, s);
+ if (!res) {
+ NWRAP_ERROR(("%s: cannot find function %s in %s\n",
+ __location__, s, b->so_path));
+ }
+ free(s);
+ s = NULL;
+ return res;
+}
+
+static struct nwrap_module_nss_fns *nwrap_load_module_fns(struct nwrap_backend *b)
+{
+ struct nwrap_module_nss_fns *fns;
+
+ if (!b->so_handle) {
+ return NULL;
+ }
+
+ fns = (struct nwrap_module_nss_fns *)malloc(sizeof(struct nwrap_module_nss_fns));
+ if (!fns) {
+ return NULL;
+ }
+
+ fns->_nss_getpwnam_r = (NSS_STATUS (*)(const char *, struct passwd *, char *, size_t, int *))
+ nwrap_load_module_fn(b, "getpwnam_r");
+ fns->_nss_getpwuid_r = (NSS_STATUS (*)(uid_t, struct passwd *, char *, size_t, int *))
+ nwrap_load_module_fn(b, "getpwuid_r");
+ fns->_nss_setpwent = (NSS_STATUS(*)(void))
+ nwrap_load_module_fn(b, "setpwent");
+ fns->_nss_getpwent_r = (NSS_STATUS (*)(struct passwd *, char *, size_t, int *))
+ nwrap_load_module_fn(b, "getpwent_r");
+ fns->_nss_endpwent = (NSS_STATUS(*)(void))
+ nwrap_load_module_fn(b, "endpwent");
+ fns->_nss_initgroups = (NSS_STATUS (*)(const char *, gid_t, long int *, long int *, gid_t **, long int, int *))
+ nwrap_load_module_fn(b, "initgroups_dyn");
+ fns->_nss_getgrnam_r = (NSS_STATUS (*)(const char *, struct group *, char *, size_t, int *))
+ nwrap_load_module_fn(b, "getgrnam_r");
+ fns->_nss_getgrgid_r = (NSS_STATUS (*)(gid_t, struct group *, char *, size_t, int *))
+ nwrap_load_module_fn(b, "getgrgid_r");
+ fns->_nss_setgrent = (NSS_STATUS(*)(void))
+ nwrap_load_module_fn(b, "setgrent");
+ fns->_nss_getgrent_r = (NSS_STATUS (*)(struct group *, char *, size_t, int *))
+ nwrap_load_module_fn(b, "getgrent_r");
+ fns->_nss_endgrent = (NSS_STATUS(*)(void))
+ nwrap_load_module_fn(b, "endgrent");
+
+ return fns;
+}
+
+static void *nwrap_load_module(const char *so_path)
+{
+ void *h;
+
+ if (!so_path || !strlen(so_path)) {
+ return NULL;
+ }
+
+ h = dlopen(so_path, RTLD_LAZY);
+ if (!h) {
+ NWRAP_ERROR(("%s: cannot open shared library %s\n",
+ __location__, so_path));
+ return NULL;
+ }
+
+ return h;
+}
+
static bool nwrap_module_init(const char *name,
struct nwrap_ops *ops,
+ const char *so_path,
int *num_backends,
struct nwrap_backend **backends)
{
@@ -300,6 +411,9 @@ static bool nwrap_module_init(const char *name,
(*backends)[*num_backends].name = name;
(*backends)[*num_backends].ops = ops;
+ (*backends)[*num_backends].so_path = so_path;
+ (*backends)[*num_backends].so_handle = nwrap_load_module(so_path);
+ (*backends)[*num_backends].fns = nwrap_load_module_fns(&((*backends)[*num_backends]));
(*num_backends)++;
@@ -311,7 +425,7 @@ static void nwrap_backend_init(struct nwrap_main *r)
r->num_backends = 0;
r->backends = NULL;
- if (!nwrap_module_init("files", &nwrap_files_ops,
+ if (!nwrap_module_init("files", &nwrap_files_ops, NULL,
&r->num_backends,
&r->backends)) {
NWRAP_ERROR(("%s: failed to initialize 'files' backend\n",