minix/lib/libc/yp/yplib.c

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/* $NetBSD: yplib.c,v 1.43 2006/11/03 20:18:49 christos 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.
*
* 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 1.43 2006/11/03 20:18:49 christos Exp $");
#endif
#include "namespace.h"
#include "reentrant.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <arpa/nameser.h>
#include <assert.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
#ifdef _REENTRANT
static mutex_t _ypmutex = MUTEX_INITIALIZER;
#define YPLOCK() mutex_lock(&_ypmutex)
#define YPUNLOCK() mutex_unlock(&_ypmutex)
#else
#define YPLOCK()
#define YPUNLOCK()
#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;
int nerrs = 0;
ssize_t r;
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 != (ssize_t)(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);
#ifndef __minix
ysd->dom_server_addr.sin_len =
sizeof(struct sockaddr_in);
#endif /* !__minix */
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);
#ifndef __minix
clnt_sin.sin_len = sizeof(struct sockaddr_in);
#endif /* !__minix */
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, (rpcproc_t)YPBINDPROC_DOMAIN,
(xdrproc_t)xdr_ypdomain_wrap_string, &dom,
(xdrproc_t)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);
#ifndef __minix
ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
#endif /* !__minix */
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)strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
}
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, FD_CLOEXEC) == -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;
{
_DIAGASSERT(ypb != NULL);
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;
{
if (domp == NULL)
return YPERR_BADARGS;
*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;
int good;
YPLOCK();
if (_yp_domain[0] == '\0')
if (yp_get_default_domain(&unused)) {
good = 0;
goto done;
}
if (dom)
*dom = _yp_domain;
good = yp_bind(_yp_domain) == 0;
done:
YPUNLOCK();
return good;
}
/*
* _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;
}