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glibc/nis/nis_call.c

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/* Copyright (C) 1997-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <libintl.h>
#include <rpc/rpc.h>
#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"
#include <libnsl.h>
static const struct timeval RPCTIMEOUT = {10, 0};
static const struct timeval UDPTIMEOUT = {5, 0};
extern u_short __pmap_getnisport (struct sockaddr_in *address, u_long program,
u_long version, u_int protocol);
unsigned long int
inetstr2int (const char *str)
{
size_t j = 0;
for (size_t i = 0; str[i] != '\0'; ++i)
if (str[i] == '.' && __builtin_expect (++j == 4, 0))
{
char buffer[i + 1];
buffer[i] = '\0';
return inet_addr (memcpy (buffer, str, i));
}
return inet_addr (str);
}
void
__nisbind_destroy (dir_binding *bind)
{
if (bind->clnt != NULL)
{
if (bind->use_auth)
auth_destroy (bind->clnt->cl_auth);
clnt_destroy (bind->clnt);
}
}
libnsl_hidden_def (__nisbind_destroy)
nis_error
__nisbind_next (dir_binding *bind)
{
if (bind->clnt != NULL)
{
if (bind->use_auth)
auth_destroy (bind->clnt->cl_auth);
clnt_destroy (bind->clnt);
bind->clnt = NULL;
}
if (bind->trys >= bind->server_len)
return NIS_FAIL;
for (u_int j = bind->current_ep + 1;
j < bind->server_val[bind->server_used].ep.ep_len; ++j)
if (strcmp (bind->server_val[bind->server_used].ep.ep_val[j].family,
"inet") == 0)
if (bind->server_val[bind->server_used].ep.ep_val[j].proto[0] == '-')
{
bind->current_ep = j;
return NIS_SUCCESS;
}
++bind->trys;
++bind->server_used;
if (bind->server_used >= bind->server_len)
bind->server_used = 0;
for (u_int j = 0; j < bind->server_val[bind->server_used].ep.ep_len; ++j)
if (strcmp (bind->server_val[bind->server_used].ep.ep_val[j].family,
"inet") == 0)
if (bind->server_val[bind->server_used].ep.ep_val[j].proto[0] == '-')
{
bind->current_ep = j;
return NIS_SUCCESS;
}
return NIS_FAIL;
}
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;
serv = &dbp->server_val[dbp->server_used];
memset (&dbp->addr, '\0', sizeof (dbp->addr));
dbp->addr.sin_family = AF_INET;
dbp->addr.sin_addr.s_addr =
inetstr2int (serv->ep.ep_val[dbp->current_ep].uaddr);
if (dbp->addr.sin_addr.s_addr == INADDR_NONE)
return NIS_FAIL;
/* Check, if the host is online and rpc.nisd is running. Much faster
then the clnt*_create functions: */
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,
UDPTIMEOUT, &dbp->socket);
else
dbp->clnt = clnttcp_create (&dbp->addr, NIS_PROG, NIS_VERSION,
&dbp->socket, 0, 0);
if (dbp->clnt == NULL)
return NIS_RPCERROR;
clnt_control (dbp->clnt, CLSET_TIMEOUT, (caddr_t) &RPCTIMEOUT);
/* If the program exists, close the socket */
if (fcntl (dbp->socket, F_SETFD, 1) == -1)
perror ("fcntl: F_SETFD");
if (dbp->use_auth)
{
if (serv->key_type == NIS_PK_DH)
{
char netname[MAXNETNAMELEN + 1];
char *p;
des_block ckey;
p = stpcpy (netname, "unix@");
strncpy (p, serv->name, MAXNETNAMELEN - 5);
netname[MAXNETNAMELEN] = '\0';
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 ();
}
else
dbp->clnt->cl_auth = authunix_create_default ();
}
return NIS_SUCCESS;
}
libnsl_hidden_def (__nisbind_connect)
nis_error
__nisbind_create (dir_binding *dbp, const nis_server *serv_val,
unsigned int serv_len, unsigned int server_used,
unsigned int current_ep, unsigned int flags)
{
dbp->clnt = NULL;
dbp->server_len = serv_len;
dbp->server_val = (nis_server *)serv_val;
if (flags & USE_DGRAM)
dbp->use_udp = TRUE;
else
dbp->use_udp = FALSE;
if (flags & NO_AUTHINFO)
dbp->use_auth = FALSE;
else
dbp->use_auth = TRUE;
if (flags & MASTER_ONLY)
dbp->master_only = TRUE;
else
dbp->master_only = FALSE;
/* We try the first server */
dbp->trys = 1;
dbp->class = -1;
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;
}
libnsl_hidden_def (__nisbind_create)
/* __nisbind_connect (dbp) must be run before calling this function !
So we could use the same binding twice */
nis_error
__do_niscall3 (dir_binding *dbp, u_long prog, xdrproc_t xargs, caddr_t req,
xdrproc_t xres, caddr_t resp, unsigned int flags, nis_cb *cb)
{
enum clnt_stat result;
nis_error retcode;
if (dbp == NULL)
return NIS_NAMEUNREACHABLE;
do
{
again:
result = clnt_call (dbp->clnt, prog, xargs, req, xres, resp, RPCTIMEOUT);
if (result != RPC_SUCCESS)
retcode = NIS_RPCERROR;
else
{
switch (prog)
{
case NIS_IBLIST:
if ((((nis_result *)resp)->status == NIS_CBRESULTS) &&
(cb != NULL))
{
__nis_do_callback (dbp, &((nis_result *) resp)->cookie, cb);
break;
}
/* Yes, the missing break is correct. If we doesn't have to
start a callback, look if we have to search another server */
case NIS_LOOKUP:
case NIS_ADD:
case NIS_MODIFY:
case NIS_REMOVE:
case NIS_IBADD:
case NIS_IBMODIFY:
case NIS_IBREMOVE:
case NIS_IBFIRST:
case NIS_IBNEXT:
if (((nis_result *)resp)->status == NIS_SYSTEMERROR
|| ((nis_result *)resp)->status == NIS_NOSUCHNAME
|| ((nis_result *)resp)->status == NIS_NOT_ME)
{
next_server:
if (__nisbind_next (dbp) == NIS_SUCCESS)
{
while (__nisbind_connect (dbp) != NIS_SUCCESS)
{
if (__nisbind_next (dbp) != NIS_SUCCESS)
return NIS_SUCCESS;
}
}
else
break; /* No more servers to search in */
goto again;
}
break;
case NIS_FINDDIRECTORY:
if (((fd_result *)resp)->status == NIS_SYSTEMERROR
|| ((fd_result *)resp)->status == NIS_NOSUCHNAME
|| ((fd_result *)resp)->status == NIS_NOT_ME)
goto next_server;
break;
case NIS_DUMPLOG: /* log_result */
case NIS_DUMP:
if (((log_result *)resp)->lr_status == NIS_SYSTEMERROR
|| ((log_result *)resp)->lr_status == NIS_NOSUCHNAME
|| ((log_result *)resp)->lr_status == NIS_NOT_ME)
goto next_server;
break;
default:
break;
}
retcode = NIS_SUCCESS;
}
}
while ((flags & HARD_LOOKUP) && retcode == NIS_RPCERROR);
return retcode;
}
libnsl_hidden_def (__do_niscall3)
nis_error
__do_niscall2 (const nis_server *server, u_int server_len, u_long prog,
xdrproc_t xargs, caddr_t req, xdrproc_t xres, caddr_t resp,
unsigned int flags, nis_cb *cb)
{
dir_binding dbp;
nis_error status;
if (flags & MASTER_ONLY)
server_len = 1;
status = __nisbind_create (&dbp, server, server_len, ~0, ~0, flags);
if (status != NIS_SUCCESS)
return status;
while (__nisbind_connect (&dbp) != NIS_SUCCESS)
if (__nisbind_next (&dbp) != NIS_SUCCESS)
return NIS_NAMEUNREACHABLE;
status = __do_niscall3 (&dbp, prog, xargs, req, xres, resp, flags, cb);
__nisbind_destroy (&dbp);
return status;
}
static directory_obj *
rec_dirsearch (const_nis_name name, directory_obj *dir, nis_error *status)
{
fd_result *fd_res;
XDR xdrs;
switch (nis_dir_cmp (name, dir->do_name))
{
case SAME_NAME:
*status = NIS_SUCCESS;
return dir;
case NOT_SEQUENTIAL:
/* NOT_SEQUENTIAL means, go one up and try it there ! */
case HIGHER_NAME:
{ /* We need data from a parent domain */
directory_obj *obj;
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
replica of the parent domain) */
fd_res = __nis_finddirectory (dir, ndomain);
if (fd_res == NULL)
{
nis_free_directory (dir);
*status = NIS_NOMEMORY;
return NULL;
}
*status = fd_res->status;
if (fd_res->status != NIS_SUCCESS)
{
/* Try the current directory obj, maybe it works */
__free_fdresult (fd_res);
return dir;
}
nis_free_directory (dir);
obj = calloc (1, sizeof (directory_obj));
if (obj == NULL)
{
__free_fdresult (fd_res);
*status = NIS_NOMEMORY;
return NULL;
}
xdrmem_create (&xdrs, fd_res->dir_data.dir_data_val,
fd_res->dir_data.dir_data_len, XDR_DECODE);
_xdr_directory_obj (&xdrs, obj);
xdr_destroy (&xdrs);
__free_fdresult (fd_res);
/* We have found a NIS+ server serving ndomain, now
let us search for "name" */
return rec_dirsearch (name, obj, status);
}
break;
case LOWER_NAME:
{
directory_obj *obj;
size_t namelen = strlen (name);
char leaf[namelen + 3];
char domain[namelen + 3];
const char *ndomain;
char *cp;
strcpy (domain, name);
do
{
if (domain[0] == '\0')
{
nis_free_directory (dir);
return NULL;
}
nis_leaf_of_r (domain, leaf, sizeof (leaf));
ndomain = __nis_domain_of (domain);
memmove (domain, ndomain, strlen (ndomain) + 1);
}
while (nis_dir_cmp (domain, dir->do_name) != SAME_NAME);
cp = rawmemchr (leaf, '\0');
*cp++ = '.';
strcpy (cp, domain);
fd_res = __nis_finddirectory (dir, leaf);
if (fd_res == NULL)
{
nis_free_directory (dir);
*status = NIS_NOMEMORY;
return NULL;
}
*status = fd_res->status;
if (fd_res->status != NIS_SUCCESS)
{
/* Try the current directory object, maybe it works */
__free_fdresult (fd_res);
return dir;
}
nis_free_directory (dir);
obj = calloc (1, sizeof(directory_obj));
if (obj == NULL)
{
__free_fdresult (fd_res);
*status = NIS_NOMEMORY;
return NULL;
}
xdrmem_create (&xdrs, fd_res->dir_data.dir_data_val,
fd_res->dir_data.dir_data_len, XDR_DECODE);
_xdr_directory_obj (&xdrs, obj);
xdr_destroy (&xdrs);
__free_fdresult (fd_res);
/* We have found a NIS+ server serving ndomain, now
let us search for "name" */
return rec_dirsearch (name, obj, status);
}
break;
case BAD_NAME:
nis_free_directory (dir);
*status = NIS_BADNAME;
return NULL;
}
nis_free_directory (dir);
*status = NIS_FAIL;
return NULL;
}
/* 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, directory_obj *dir)
{
directory_obj *obj = NULL;
fd_result *fd_res;
XDR xdrs;
if (nis_dir_cmp (name, dir->do_name) == SAME_NAME)
return dir;
fd_res = __nis_finddirectory (dir, name);
if (fd_res == NULL)
return NULL;
if (fd_res->status == NIS_SUCCESS
&& (obj = calloc (1, sizeof (directory_obj))) != NULL)
{
xdrmem_create (&xdrs, fd_res->dir_data.dir_data_val,
fd_res->dir_data.dir_data_len, XDR_DECODE);
_xdr_directory_obj (&xdrs, obj);
xdr_destroy (&xdrs);
if (strcmp (dir->do_name, obj->do_name) != 0)
{
nis_free_directory (obj);
obj = NULL;
}
}
__free_fdresult (fd_res);
if (obj != NULL)
nis_free_directory (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;
int saved_errno = errno;
if (stat64 ("/var/nis/NIS_COLD_START", &st) < 0)
st.st_mtime = nis_cold_start_mtime + 1;
__set_errno (saved_errno);
__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,
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 (*dir != NULL)
return NIS_SUCCESS;
(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)
{
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;
}
int saved_errno = errno;
*dir = readColdStartFile ();
__set_errno (saved_errno);
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 */
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)
{
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;
return result;
}
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, bptrp, flags);
if (__builtin_expect (retcode != NIS_SUCCESS, 0))
return retcode;
do
if (__nisbind_connect (bptrp) == NIS_SUCCESS)
return NIS_SUCCESS;
while (__nisbind_next (bptrp) == NIS_SUCCESS);
__nisbind_destroy (bptrp);
memset (bptrp, '\0', sizeof (*bptrp));
retcode = NIS_NAMEUNREACHABLE;
nis_free_directory (*dirp);
*dirp = NULL;
return retcode;
}
libnsl_hidden_def (__prepare_niscall)
nis_error
__do_niscall (const_nis_name name, u_long prog, xdrproc_t xargs,
caddr_t req, xdrproc_t xres, caddr_t resp, unsigned int flags,
nis_cb *cb)
{
dir_binding bptr;
directory_obj *dir = NULL;
int saved_errno = errno;
nis_error retcode = __prepare_niscall (name, &dir, &bptr, flags);
if (retcode == NIS_SUCCESS)
{
retcode = __do_niscall3 (&bptr, prog, xargs, req, xres, resp, flags, cb);
__nisbind_destroy (&bptr);
nis_free_directory (dir);
}
__set_errno (saved_errno);
return retcode;
}
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