NetBSD/lib/libc/yp/yplib.c

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/* $NetBSD: yplib.c,v 1.27 1997/01/23 14:02:35 mrg Exp $ */
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/*
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* 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.
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* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: yplib.c,v 1.27 1997/01/23 14:02:35 mrg Exp $";
#endif
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#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/uio.h>
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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <unistd.h>
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#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#define BINDINGDIR "/var/yp/binding"
#define YPBINDLOCK "/var/run/ypbind.lock"
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struct dom_binding *_ypbindlist;
char _yp_domain[MAXHOSTNAMELEN];
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#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;
void _yp_unbind __P((struct dom_binding *));
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int
_yp_dobind(dom, ypdb)
const char *dom;
struct dom_binding **ypdb;
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{
static int pid = -1;
char path[MAXPATHLEN];
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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;
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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);
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gpid = getpid();
if (!(pid == -1 || pid == gpid)) {
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ysd = _ypbindlist;
while (ysd) {
if (ysd->dom_client)
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clnt_destroy(ysd->dom_client);
ysd2 = ysd->dom_pnext;
free(ysd);
ysd = ysd2;
}
_ypbindlist = NULL;
}
pid = gpid;
if (ypdb != NULL)
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*ypdb = NULL;
for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
if (strcmp(dom, ysd->dom_domain) == 0)
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break;
if (ysd == NULL) {
if ((ysd = malloc(sizeof *ysd)) == NULL)
return YPERR_YPERR;
(void)memset(ysd, 0, sizeof *ysd);
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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;
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}
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 = (caddr_t) & ypb_port;
iov[0].iov_len = sizeof ypb_port;
iov[1].iov_base = (caddr_t) & 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);
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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);
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ysd->dom_server_addr.sin_family = AF_INET;
bn = &ybr.ypbind_respbody.ypbind_bindinfo;
ysd->dom_server_addr.sin_port =
bn->ypbind_binding_port;
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ysd->dom_server_addr.sin_addr =
bn->ypbind_binding_addr;
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ysd->dom_server_port = ysd->dom_server_addr.sin_port;
(void)close(fd);
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goto gotit;
} else {
/* no lock on binding file, YP is dead. */
(void)close(fd);
if (new)
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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);
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clnt_sin.sin_len = sizeof(struct sockaddr_in);
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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) {
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clnt_pcreateerror("clnttcp_create");
if (new)
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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);
}
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clnt_destroy(client);
ysd->dom_vers = -1;
goto again;
}
clnt_destroy(client);
(void)memset(&ysd->dom_server_addr, 0,
sizeof ysd->dom_server_addr);
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ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
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ysd->dom_server_addr.sin_family = AF_INET;
bn = &ypbr.ypbind_respbody.ypbind_bindinfo;
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ysd->dom_server_addr.sin_port =
bn->ypbind_binding_port;
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ysd->dom_server_addr.sin_addr.s_addr =
bn->ypbind_binding_addr.s_addr;
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ysd->dom_server_port =
bn->ypbind_binding_port;
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gotit:
ysd->dom_vers = YPVERS;
(void)strncpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain)-1);
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}
if (ysd->dom_client)
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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) {
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clnt_pcreateerror("clntudp_create");
ysd->dom_vers = -1;
goto again;
}
if (fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
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perror("fcntl: F_SETFD");
if (new) {
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ysd->dom_pnext = _ypbindlist;
_ypbindlist = ysd;
}
if (ypdb != NULL)
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*ypdb = ysd;
return 0;
}
void
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_yp_unbind(ypb)
struct dom_binding *ypb;
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{
clnt_destroy(ypb->dom_client);
ypb->dom_client = NULL;
ypb->dom_socket = -1;
}
int
yp_bind(dom)
const char *dom;
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{
return _yp_dobind(dom, NULL);
}
void
yp_unbind(dom)
const char *dom;
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{
struct dom_binding *ypb, *ypbp;
ypbp = NULL;
for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
if (strcmp(dom, ypb->dom_domain) == 0) {
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clnt_destroy(ypb->dom_client);
if (ypbp)
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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;
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{
*domp = NULL;
if (_yp_domain[0] == '\0')
if (getdomainname(_yp_domain, sizeof _yp_domain))
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return YPERR_NODOM;
*domp = _yp_domain;
return 0;
}
int
_yp_check(dom)
char **dom;
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{
char *unused;
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if (_yp_domain[0] == '\0')
if (yp_get_default_domain(&unused))
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return 0;
if (dom)
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*dom = _yp_domain;
if (yp_bind(_yp_domain) == 0)
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return 1;
return 0;
}