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authorJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-31 13:33:18 +0000
commit32c075e1f01849e161724bbd400ba77244e482cc (patch)
tree5f083a3f352104f32bb6c902d57fa3f294bd8d4d /nis/nis_call.c
parentd6220e9ee38c1c9285221b023346201ec5f511b3 (diff)
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Diffstat (limited to 'nis/nis_call.c')
-rw-r--r--nis/nis_call.c400
1 files changed, 316 insertions, 84 deletions
diff --git a/nis/nis_call.c b/nis/nis_call.c
index 928053d..c571e8f 100644
--- a/nis/nis_call.c
+++ b/nis/nis_call.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1997,1998,2001,2004,2005,2006 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1998, 2001, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
@@ -25,8 +26,11 @@
#include <rpc/auth.h>
#include <rpcsvc/nis.h>
#include <sys/socket.h>
+#include <sys/stat.h>
+#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
+#include <bits/libc-lock.h>
#include "nis_xdr.h"
#include "nis_intern.h"
@@ -107,10 +111,79 @@ __nisbind_next (dir_binding *bind)
}
libnsl_hidden_def (__nisbind_next)
+static struct ckey_cache_entry
+{
+ struct in_addr inaddr;
+ in_port_t port;
+ unsigned int protocol;
+ des_block ckey;
+} *ckey_cache;
+static size_t ckey_cache_size;
+static size_t ckey_cache_allocated;
+static pid_t ckey_cache_pid;
+static uid_t ckey_cache_euid;
+__libc_lock_define_initialized (static, ckey_cache_lock)
+
+static bool_t
+get_ckey (des_block *ckey, struct sockaddr_in *addr, unsigned int protocol)
+{
+ size_t i;
+ pid_t pid = getpid ();
+ uid_t euid = geteuid ();
+ bool_t ret = FALSE;
+
+ __libc_lock_lock (ckey_cache_lock);
+
+ if (ckey_cache_pid != pid || ckey_cache_euid != euid)
+ {
+ ckey_cache_size = 0;
+ ckey_cache_pid = pid;
+ ckey_cache_euid = euid;
+ }
+
+ for (i = 0; i < ckey_cache_size; ++i)
+ if (ckey_cache[i].port == addr->sin_port
+ && ckey_cache[i].protocol == protocol
+ && memcmp (&ckey_cache[i].inaddr, &addr->sin_addr,
+ sizeof (addr->sin_addr)) == 0)
+ {
+ *ckey = ckey_cache[i].ckey;
+ ret = TRUE;
+ break;
+ }
+
+ if (!ret && key_gendes (ckey) >= 0)
+ {
+ ret = TRUE;
+ /* Don't grow the cache indefinitely. */
+ if (ckey_cache_size == 256)
+ ckey_cache_size = 0;
+ if (ckey_cache_size == ckey_cache_allocated)
+ {
+ size_t size = ckey_cache_allocated ? ckey_cache_allocated * 2 : 16;
+ struct ckey_cache_entry *new_cache
+ = realloc (ckey_cache, size * sizeof (*ckey_cache));
+ if (new_cache != NULL)
+ {
+ ckey_cache = new_cache;
+ ckey_cache_allocated = size;
+ }
+ }
+ ckey_cache[ckey_cache_size].inaddr = addr->sin_addr;
+ ckey_cache[ckey_cache_size].port = addr->sin_port;
+ ckey_cache[ckey_cache_size].protocol = protocol;
+ ckey_cache[ckey_cache_size++].ckey = *ckey;
+ }
+
+ __libc_lock_unlock (ckey_cache_lock);
+ return ret;
+}
+
nis_error
__nisbind_connect (dir_binding *dbp)
{
nis_server *serv;
+ u_short port;
if (dbp == NULL)
return NIS_FAIL;
@@ -128,9 +201,12 @@ __nisbind_connect (dir_binding *dbp)
/* Check, if the host is online and rpc.nisd is running. Much faster
then the clnt*_create functions: */
- if (__pmap_getnisport (&dbp->addr, NIS_PROG, NIS_VERSION, IPPROTO_UDP) == 0)
+ port = __pmap_getnisport (&dbp->addr, NIS_PROG, NIS_VERSION,
+ dbp->use_udp ? IPPROTO_UDP : IPPROTO_TCP);
+ if (port == 0)
return NIS_RPCERROR;
+ dbp->addr.sin_port = htons (port);
dbp->socket = RPC_ANYSOCK;
if (dbp->use_udp)
dbp->clnt = clntudp_create (&dbp->addr, NIS_PROG, NIS_VERSION,
@@ -153,17 +229,16 @@ __nisbind_connect (dir_binding *dbp)
{
char netname[MAXNETNAMELEN + 1];
char *p;
+ des_block ckey;
- p = stpcpy (netname, "unix.");
+ p = stpcpy (netname, "unix@");
strncpy (p, serv->name, MAXNETNAMELEN - 5);
netname[MAXNETNAMELEN] = '\0';
- // XXX What is this supposed to do? If we really want to replace
- // XXX the first dot, then we might as well use unix@ as the
- // XXX prefix string. --drepper
- p = strchr (netname, '.');
- *p = '@';
- dbp->clnt->cl_auth =
- authdes_pk_create (netname, &serv->pkey, 300, NULL, NULL);
+ dbp->clnt->cl_auth = NULL;
+ if (get_ckey (&ckey, &dbp->addr,
+ dbp->use_udp ? IPPROTO_UDP : IPPROTO_TCP))
+ dbp->clnt->cl_auth =
+ authdes_pk_create (netname, &serv->pkey, 300, NULL, &ckey);
if (!dbp->clnt->cl_auth)
dbp->clnt->cl_auth = authunix_create_default ();
}
@@ -177,7 +252,8 @@ libnsl_hidden_def (__nisbind_connect)
nis_error
__nisbind_create (dir_binding *dbp, const nis_server *serv_val,
- unsigned int serv_len, unsigned int flags)
+ unsigned int serv_len, unsigned int server_used,
+ unsigned int current_ep, unsigned int flags)
{
dbp->clnt = NULL;
@@ -203,8 +279,16 @@ __nisbind_create (dir_binding *dbp, const nis_server *serv_val,
dbp->trys = 1;
dbp->class = -1;
- if (__nis_findfastest (dbp) < 1)
- return NIS_NAMEUNREACHABLE;
+ if (server_used == ~0)
+ {
+ if (__nis_findfastest (dbp) < 1)
+ return NIS_NAMEUNREACHABLE;
+ }
+ else
+ {
+ dbp->server_used = server_used;
+ dbp->current_ep = current_ep;
+ }
return NIS_SUCCESS;
}
@@ -306,7 +390,7 @@ __do_niscall2 (const nis_server *server, u_int server_len, u_long prog,
if (flags & MASTER_ONLY)
server_len = 1;
- status = __nisbind_create (&dbp, server, server_len, flags);
+ status = __nisbind_create (&dbp, server, server_len, ~0, ~0, flags);
if (status != NIS_SUCCESS)
return status;
@@ -338,9 +422,7 @@ rec_dirsearch (const_nis_name name, directory_obj *dir, nis_error *status)
case HIGHER_NAME:
{ /* We need data from a parent domain */
directory_obj *obj;
- char ndomain[strlen (dir->do_name) + 3];
-
- nis_domain_of_r (dir->do_name, ndomain, sizeof (ndomain));
+ const char *ndomain = __nis_domain_of (dir->do_name);
/* The root server of our domain is a replica of the parent
domain ! (Now I understand why a root server must be a
@@ -384,7 +466,7 @@ rec_dirsearch (const_nis_name name, directory_obj *dir, nis_error *status)
size_t namelen = strlen (name);
char leaf[namelen + 3];
char domain[namelen + 3];
- char ndomain[namelen + 3];
+ const char *ndomain;
char *cp;
strcpy (domain, name);
@@ -397,8 +479,8 @@ rec_dirsearch (const_nis_name name, directory_obj *dir, nis_error *status)
return NULL;
}
nis_leaf_of_r (domain, leaf, sizeof (leaf));
- nis_domain_of_r (domain, ndomain, sizeof (ndomain));
- strcpy (domain, ndomain);
+ ndomain = __nis_domain_of (domain);
+ memmove (domain, ndomain, strlen (ndomain) + 1);
}
while (nis_dir_cmp (domain, dir->do_name) != SAME_NAME);
@@ -451,29 +533,16 @@ rec_dirsearch (const_nis_name name, directory_obj *dir, nis_error *status)
/* We try to query the current server for the searched object,
maybe he know about it ? */
static directory_obj *
-first_shoot (const_nis_name name, int search_parent_first, directory_obj *dir)
+first_shoot (const_nis_name name, directory_obj *dir)
{
directory_obj *obj = NULL;
fd_result *fd_res;
XDR xdrs;
- char domain[strlen (name) + 3];
-#if 0
if (nis_dir_cmp (name, dir->do_name) == SAME_NAME)
return dir;
-#endif
- const char *search_name = name;
- if (search_parent_first)
- {
- nis_domain_of_r (name, domain, sizeof (domain));
- search_name = domain;
- }
-
- if (nis_dir_cmp (search_name, dir->do_name) == SAME_NAME)
- return dir;
-
- fd_res = __nis_finddirectory (dir, search_name);
+ fd_res = __nis_finddirectory (dir, name);
if (fd_res == NULL)
return NULL;
if (fd_res->status == NIS_SUCCESS
@@ -499,42 +568,224 @@ first_shoot (const_nis_name name, int search_parent_first, directory_obj *dir)
return obj;
}
+static struct nis_server_cache
+{
+ int search_parent;
+ int uses;
+ unsigned int size;
+ unsigned int server_used;
+ unsigned int current_ep;
+ time_t expires;
+ char name[];
+} *nis_server_cache[16];
+static time_t nis_cold_start_mtime;
+__libc_lock_define_initialized (static, nis_server_cache_lock)
+
+static directory_obj *
+nis_server_cache_search (const_nis_name name, int search_parent,
+ unsigned int *server_used, unsigned int *current_ep,
+ struct timeval *now)
+{
+ directory_obj *ret = NULL;
+ int i;
+ char *addr;
+ XDR xdrs;
+ struct stat64 st;
+
+ if (stat64 ("/var/nis/NIS_COLD_START", &st) < 0)
+ st.st_mtime = nis_cold_start_mtime + 1;
+
+ __libc_lock_lock (nis_server_cache_lock);
+
+ for (i = 0; i < 16; ++i)
+ if (nis_server_cache[i] == NULL)
+ continue;
+ else if (st.st_mtime != nis_cold_start_mtime
+ || now->tv_sec > nis_server_cache[i]->expires)
+ {
+ free (nis_server_cache[i]);
+ nis_server_cache[i] = NULL;
+ }
+ else if (nis_server_cache[i]->search_parent == search_parent
+ && strcmp (nis_server_cache[i]->name, name) == 0)
+ {
+ ret = calloc (1, sizeof (directory_obj));
+ if (ret == NULL)
+ break;
+
+ addr = rawmemchr (nis_server_cache[i]->name, '\0') + 8;
+ addr = (char *) ((uintptr_t) addr & ~(uintptr_t) 7);
+ xdrmem_create (&xdrs, addr, nis_server_cache[i]->size, XDR_DECODE);
+ if (!_xdr_directory_obj (&xdrs, ret))
+ {
+ xdr_destroy (&xdrs);
+ free (ret);
+ ret = NULL;
+ free (nis_server_cache[i]);
+ nis_server_cache[i] = NULL;
+ break;
+ }
+ xdr_destroy (&xdrs);
+ *server_used = nis_server_cache[i]->server_used;
+ *current_ep = nis_server_cache[i]->current_ep;
+ break;
+ }
+
+ nis_cold_start_mtime = st.st_mtime;
+
+ __libc_lock_unlock (nis_server_cache_lock);
+ return ret;
+}
+
+static void
+nis_server_cache_add (const_nis_name name, int search_parent,
+ directory_obj *dir, unsigned int server_used,
+ unsigned int current_ep, struct timeval *now)
+{
+ struct nis_server_cache **loc;
+ struct nis_server_cache *new;
+ struct nis_server_cache *old;
+ int i;
+ char *addr;
+ unsigned int size;
+ XDR xdrs;
+
+ if (dir == NULL)
+ return;
+
+ size = xdr_sizeof ((xdrproc_t) _xdr_directory_obj, (char *) dir);
+ new = calloc (1, sizeof (*new) + strlen (name) + 8 + size);
+ if (new == NULL)
+ return;
+ new->search_parent = search_parent;
+ new->uses = 1;
+ new->expires = now->tv_sec + dir->do_ttl;
+ new->size = size;
+ new->server_used = server_used;
+ new->current_ep = current_ep;
+ addr = stpcpy (new->name, name) + 8;
+ addr = (char *) ((uintptr_t) addr & ~(uintptr_t) 7);
+
+ xdrmem_create(&xdrs, addr, size, XDR_ENCODE);
+ if (!_xdr_directory_obj (&xdrs, dir))
+ {
+ xdr_destroy (&xdrs);
+ free (new);
+ return;
+ }
+ xdr_destroy (&xdrs);
+
+ __libc_lock_lock (nis_server_cache_lock);
+
+ /* Choose which entry should be evicted from the cache. */
+ loc = &nis_server_cache[0];
+ if (*loc != NULL)
+ for (i = 1; i < 16; ++i)
+ if (nis_server_cache[i] == NULL)
+ {
+ loc = &nis_server_cache[i];
+ break;
+ }
+ else if ((*loc)->uses > nis_server_cache[i]->uses
+ || ((*loc)->uses == nis_server_cache[i]->uses
+ && (*loc)->expires > nis_server_cache[i]->expires))
+ loc = &nis_server_cache[i];
+ old = *loc;
+ *loc = new;
+
+ __libc_lock_unlock (nis_server_cache_lock);
+ free (old);
+}
+
nis_error
-__nisfind_server (const_nis_name name, int search_parent_first,
- directory_obj **dir)
+__nisfind_server (const_nis_name name, int search_parent,
+ directory_obj **dir, dir_binding *dbp, unsigned int flags)
{
+ nis_error result = NIS_SUCCESS;
+ nis_error status;
+ directory_obj *obj;
+ struct timeval now;
+ unsigned int server_used = ~0;
+ unsigned int current_ep = ~0;
+
if (name == NULL)
return NIS_BADNAME;
-#if 0
- /* Search in local cache. In the moment, we ignore the fastest server */
- if (!(flags & NO_CACHE))
- dir = __nis_cache_search (name, flags, &cinfo);
-#endif
+ if (*dir != NULL)
+ return NIS_SUCCESS;
- nis_error result = NIS_SUCCESS;
- if (*dir == NULL)
+ (void) gettimeofday (&now, NULL);
+
+ if ((flags & NO_CACHE) == 0)
+ *dir = nis_server_cache_search (name, search_parent, &server_used,
+ &current_ep, &now);
+ if (*dir != NULL)
{
- nis_error status;
- directory_obj *obj;
+ unsigned int server_len = (*dir)->do_servers.do_servers_len;
+ if (flags & MASTER_ONLY)
+ {
+ server_len = 1;
+ if (server_used != 0)
+ {
+ server_used = ~0;
+ current_ep = ~0;
+ }
+ }
+ result = __nisbind_create (dbp, (*dir)->do_servers.do_servers_val,
+ server_len, server_used, current_ep, flags);
+ if (result != NIS_SUCCESS)
+ {
+ nis_free_directory (*dir);
+ *dir = NULL;
+ }
+ return result;
+ }
- *dir = readColdStartFile ();
- if (*dir == NULL)
- /* No /var/nis/NIS_COLD_START->no NIS+ installed. */
- return NIS_UNAVAIL;
+ *dir = readColdStartFile ();
+ if (*dir == NULL)
+ /* No /var/nis/NIS_COLD_START->no NIS+ installed. */
+ return NIS_UNAVAIL;
- /* Try at first, if servers in "dir" know our object */
- obj = first_shoot (name, search_parent_first, *dir);
+ /* Try at first, if servers in "dir" know our object */
+ const char *search_name = name;
+ if (search_parent)
+ search_name = __nis_domain_of (name);
+ obj = first_shoot (search_name, *dir);
+ if (obj == NULL)
+ {
+ obj = rec_dirsearch (search_name, *dir, &status);
if (obj == NULL)
+ result = status;
+ }
+
+ if (result == NIS_SUCCESS)
+ {
+ unsigned int server_len = obj->do_servers.do_servers_len;
+ if (flags & MASTER_ONLY)
+ server_len = 1;
+ result = __nisbind_create (dbp, obj->do_servers.do_servers_val,
+ server_len, ~0, ~0, flags);
+ if (result == NIS_SUCCESS)
{
- obj = rec_dirsearch (name, *dir, &status);
- if (obj == NULL)
- result = status;
+ if ((flags & MASTER_ONLY) == 0
+ || obj->do_servers.do_servers_len == 1)
+ {
+ server_used = dbp->server_used;
+ current_ep = dbp->current_ep;
+ }
+ if ((flags & NO_CACHE) == 0)
+ nis_server_cache_add (name, search_parent, obj,
+ server_used, current_ep, &now);
+ }
+ else
+ {
+ nis_free_directory (obj);
+ obj = NULL;
}
-
- *dir = obj;
}
+ *dir = obj;
+
return result;
}
@@ -543,38 +794,19 @@ nis_error
__prepare_niscall (const_nis_name name, directory_obj **dirp,
dir_binding *bptrp, unsigned int flags)
{
- nis_error retcode = __nisfind_server (name, 1, dirp);
+ nis_error retcode = __nisfind_server (name, 1, dirp, bptrp, flags);
if (__builtin_expect (retcode != NIS_SUCCESS, 0))
return retcode;
- nis_server *server;
- u_int server_len;
-
- if (flags & MASTER_ONLY)
- {
- server = (*dirp)->do_servers.do_servers_val;
- server_len = 1;
- }
- else
- {
- server = (*dirp)->do_servers.do_servers_val;
- server_len = (*dirp)->do_servers.do_servers_len;
- }
-
- retcode = __nisbind_create (bptrp, server, server_len, flags);
- if (retcode == NIS_SUCCESS)
- {
- do
- if (__nisbind_connect (bptrp) == NIS_SUCCESS)
- return NIS_SUCCESS;
- while (__nisbind_next (bptrp) == NIS_SUCCESS);
-
- __nisbind_destroy (bptrp);
- memset (bptrp, '\0', sizeof (*bptrp));
+ do
+ if (__nisbind_connect (bptrp) == NIS_SUCCESS)
+ return NIS_SUCCESS;
+ while (__nisbind_next (bptrp) == NIS_SUCCESS);
- retcode = NIS_NAMEUNREACHABLE;
- }
+ __nisbind_destroy (bptrp);
+ memset (bptrp, '\0', sizeof (*bptrp));
+ retcode = NIS_NAMEUNREACHABLE;
nis_free_directory (*dirp);
*dirp = NULL;