349 lines
8.5 KiB
C
349 lines
8.5 KiB
C
/* $NetBSD: yplib.c,v 1.32 1998/07/27 12:29:21 mycroft Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1992, 1993 Theo de Raadt <deraadt@fsa.ca>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Theo de Raadt.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: yplib.c,v 1.32 1998/07/27 12:29:21 mycroft Exp $");
|
|
#endif
|
|
|
|
#include "namespace.h"
|
|
#include <sys/param.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/file.h>
|
|
#include <sys/uio.h>
|
|
#include <arpa/nameser.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <rpc/rpc.h>
|
|
#include <rpc/xdr.h>
|
|
#include <rpcsvc/yp_prot.h>
|
|
#include <rpcsvc/ypclnt.h>
|
|
#include "local.h"
|
|
|
|
#define BINDINGDIR "/var/yp/binding"
|
|
#define YPBINDLOCK "/var/run/ypbind.lock"
|
|
|
|
struct dom_binding *_ypbindlist;
|
|
char _yp_domain[MAXHOSTNAMELEN];
|
|
|
|
#define YPLIB_TIMEOUT 10
|
|
#define YPLIB_RPC_RETRIES 4
|
|
|
|
struct timeval _yplib_timeout = { YPLIB_TIMEOUT, 0 };
|
|
struct timeval _yplib_rpc_timeout = { YPLIB_TIMEOUT / YPLIB_RPC_RETRIES,
|
|
1000000 * (YPLIB_TIMEOUT % YPLIB_RPC_RETRIES) / YPLIB_RPC_RETRIES };
|
|
int _yplib_nerrs = 5;
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(yp_bind, _yp_bind);
|
|
__weak_alias(yp_unbind, _yp_unbind);
|
|
__weak_alias(yp_get_default_domain, _yp_get_default_domain);
|
|
#endif
|
|
|
|
int
|
|
_yp_dobind(dom, ypdb)
|
|
const char *dom;
|
|
struct dom_binding **ypdb;
|
|
{
|
|
static int pid = -1;
|
|
char path[MAXPATHLEN];
|
|
struct dom_binding *ysd, *ysd2;
|
|
struct ypbind_resp ypbr;
|
|
struct sockaddr_in clnt_sin;
|
|
int clnt_sock, fd, gpid;
|
|
CLIENT *client;
|
|
int new = 0, r;
|
|
int nerrs = 0;
|
|
|
|
if (dom == NULL || *dom == '\0')
|
|
return YPERR_BADARGS;
|
|
|
|
/*
|
|
* test if YP is running or not
|
|
*/
|
|
if ((fd = open(YPBINDLOCK, O_RDONLY)) == -1)
|
|
return YPERR_YPBIND;
|
|
if (!(flock(fd, LOCK_EX | LOCK_NB) == -1 && errno == EWOULDBLOCK)) {
|
|
(void)close(fd);
|
|
return YPERR_YPBIND;
|
|
}
|
|
(void)close(fd);
|
|
|
|
gpid = getpid();
|
|
if (!(pid == -1 || pid == gpid)) {
|
|
ysd = _ypbindlist;
|
|
while (ysd) {
|
|
if (ysd->dom_client)
|
|
clnt_destroy(ysd->dom_client);
|
|
ysd2 = ysd->dom_pnext;
|
|
free(ysd);
|
|
ysd = ysd2;
|
|
}
|
|
_ypbindlist = NULL;
|
|
}
|
|
pid = gpid;
|
|
|
|
if (ypdb != NULL)
|
|
*ypdb = NULL;
|
|
|
|
for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
|
|
if (strcmp(dom, ysd->dom_domain) == 0)
|
|
break;
|
|
if (ysd == NULL) {
|
|
if ((ysd = malloc(sizeof *ysd)) == NULL)
|
|
return YPERR_YPERR;
|
|
(void)memset(ysd, 0, sizeof *ysd);
|
|
ysd->dom_socket = -1;
|
|
ysd->dom_vers = 0;
|
|
new = 1;
|
|
}
|
|
again:
|
|
if (ysd->dom_vers == 0) {
|
|
(void) snprintf(path, sizeof(path), "%s/%s.%d",
|
|
BINDINGDIR, dom, 2);
|
|
if ((fd = open(path, O_RDONLY)) == -1) {
|
|
/*
|
|
* no binding file, YP is dead, or not yet fully
|
|
* alive.
|
|
*/
|
|
goto trynet;
|
|
}
|
|
if (flock(fd, LOCK_EX | LOCK_NB) == -1 &&
|
|
errno == EWOULDBLOCK) {
|
|
struct iovec iov[2];
|
|
struct ypbind_resp ybr;
|
|
u_short ypb_port;
|
|
struct ypbind_binding *bn;
|
|
|
|
iov[0].iov_base = &ypb_port;
|
|
iov[0].iov_len = sizeof ypb_port;
|
|
iov[1].iov_base = &ybr;
|
|
iov[1].iov_len = sizeof ybr;
|
|
|
|
r = readv(fd, iov, 2);
|
|
if (r != iov[0].iov_len + iov[1].iov_len) {
|
|
(void)close(fd);
|
|
ysd->dom_vers = -1;
|
|
goto again;
|
|
}
|
|
(void)memset(&ysd->dom_server_addr, 0,
|
|
sizeof ysd->dom_server_addr);
|
|
ysd->dom_server_addr.sin_len =
|
|
sizeof(struct sockaddr_in);
|
|
ysd->dom_server_addr.sin_family = AF_INET;
|
|
bn = &ybr.ypbind_respbody.ypbind_bindinfo;
|
|
ysd->dom_server_addr.sin_port =
|
|
bn->ypbind_binding_port;
|
|
|
|
ysd->dom_server_addr.sin_addr =
|
|
bn->ypbind_binding_addr;
|
|
|
|
ysd->dom_server_port = ysd->dom_server_addr.sin_port;
|
|
(void)close(fd);
|
|
goto gotit;
|
|
} else {
|
|
/* no lock on binding file, YP is dead. */
|
|
(void)close(fd);
|
|
if (new)
|
|
free(ysd);
|
|
return YPERR_YPBIND;
|
|
}
|
|
}
|
|
trynet:
|
|
if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
|
|
struct ypbind_binding *bn;
|
|
(void)memset(&clnt_sin, 0, sizeof clnt_sin);
|
|
clnt_sin.sin_len = sizeof(struct sockaddr_in);
|
|
clnt_sin.sin_family = AF_INET;
|
|
clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
|
|
|
|
clnt_sock = RPC_ANYSOCK;
|
|
client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS,
|
|
&clnt_sock, 0, 0);
|
|
if (client == NULL) {
|
|
clnt_pcreateerror("clnttcp_create");
|
|
if (new)
|
|
free(ysd);
|
|
return YPERR_YPBIND;
|
|
}
|
|
r = clnt_call(client, YPBINDPROC_DOMAIN,
|
|
xdr_ypdomain_wrap_string, &dom, xdr_ypbind_resp,
|
|
&ypbr, _yplib_timeout);
|
|
if (r != RPC_SUCCESS) {
|
|
if (new == 0 && ++nerrs == _yplib_nerrs) {
|
|
nerrs = 0;
|
|
fprintf(stderr,
|
|
"YP server for domain %s not responding, still trying\n",
|
|
dom);
|
|
}
|
|
clnt_destroy(client);
|
|
ysd->dom_vers = -1;
|
|
goto again;
|
|
}
|
|
clnt_destroy(client);
|
|
|
|
(void)memset(&ysd->dom_server_addr, 0,
|
|
sizeof ysd->dom_server_addr);
|
|
ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
|
|
ysd->dom_server_addr.sin_family = AF_INET;
|
|
bn = &ypbr.ypbind_respbody.ypbind_bindinfo;
|
|
ysd->dom_server_addr.sin_port =
|
|
bn->ypbind_binding_port;
|
|
ysd->dom_server_addr.sin_addr.s_addr =
|
|
bn->ypbind_binding_addr.s_addr;
|
|
ysd->dom_server_port =
|
|
bn->ypbind_binding_port;
|
|
gotit:
|
|
ysd->dom_vers = YPVERS;
|
|
(void)strncpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain)-1);
|
|
}
|
|
if (ysd->dom_client)
|
|
clnt_destroy(ysd->dom_client);
|
|
ysd->dom_socket = RPC_ANYSOCK;
|
|
ysd->dom_client = clntudp_create(&ysd->dom_server_addr,
|
|
YPPROG, YPVERS, _yplib_rpc_timeout, &ysd->dom_socket);
|
|
if (ysd->dom_client == NULL) {
|
|
clnt_pcreateerror("clntudp_create");
|
|
ysd->dom_vers = -1;
|
|
goto again;
|
|
}
|
|
if (fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
|
|
perror("fcntl: F_SETFD");
|
|
|
|
if (new) {
|
|
ysd->dom_pnext = _ypbindlist;
|
|
_ypbindlist = ysd;
|
|
}
|
|
if (ypdb != NULL)
|
|
*ypdb = ysd;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
__yp_unbind(ypb)
|
|
struct dom_binding *ypb;
|
|
{
|
|
clnt_destroy(ypb->dom_client);
|
|
ypb->dom_client = NULL;
|
|
ypb->dom_socket = -1;
|
|
}
|
|
|
|
int
|
|
yp_bind(dom)
|
|
const char *dom;
|
|
{
|
|
if (_yp_invalid_domain(dom))
|
|
return YPERR_BADARGS;
|
|
|
|
return _yp_dobind(dom, NULL);
|
|
}
|
|
|
|
void
|
|
yp_unbind(dom)
|
|
const char *dom;
|
|
{
|
|
struct dom_binding *ypb, *ypbp;
|
|
|
|
if (_yp_invalid_domain(dom))
|
|
return;
|
|
|
|
ypbp = NULL;
|
|
for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
|
|
if (strcmp(dom, ypb->dom_domain) == 0) {
|
|
clnt_destroy(ypb->dom_client);
|
|
if (ypbp)
|
|
ypbp->dom_pnext = ypb->dom_pnext;
|
|
else
|
|
_ypbindlist = ypb->dom_pnext;
|
|
free(ypb);
|
|
return;
|
|
}
|
|
ypbp = ypb;
|
|
}
|
|
return;
|
|
}
|
|
|
|
int
|
|
yp_get_default_domain(domp)
|
|
char **domp;
|
|
{
|
|
*domp = NULL;
|
|
if (_yp_domain[0] == '\0')
|
|
if (getdomainname(_yp_domain, sizeof _yp_domain))
|
|
return YPERR_NODOM;
|
|
*domp = _yp_domain;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
_yp_check(dom)
|
|
char **dom;
|
|
{
|
|
char *unused;
|
|
|
|
if (_yp_domain[0] == '\0')
|
|
if (yp_get_default_domain(&unused))
|
|
return 0;
|
|
|
|
if (dom)
|
|
*dom = _yp_domain;
|
|
|
|
if (yp_bind(_yp_domain) == 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* _yp_invalid_domain: check if given domainname isn't legal.
|
|
* returns non-zero if invalid
|
|
*/
|
|
int
|
|
_yp_invalid_domain(dom)
|
|
const char *dom;
|
|
{
|
|
if (dom == NULL || *dom == '\0')
|
|
return 1;
|
|
|
|
if (strlen(dom) > YPMAXDOMAIN)
|
|
return 1;
|
|
|
|
if (strchr(dom, '/') != NULL)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|