357 lines
8.6 KiB
C
357 lines
8.6 KiB
C
/* $NetBSD: yplib.c,v 1.37 2000/07/06 03:14:05 christos Exp $ */
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/*
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* Copyright (c) 1992, 1993 Theo de Raadt <deraadt@fsa.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Theo de Raadt.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: yplib.c,v 1.37 2000/07/06 03:14:05 christos Exp $");
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#endif
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#include "namespace.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/uio.h>
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#include <arpa/nameser.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <rpc/rpc.h>
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#include <rpc/xdr.h>
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#include <rpcsvc/yp_prot.h>
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#include <rpcsvc/ypclnt.h>
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#include "local.h"
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#define BINDINGDIR "/var/yp/binding"
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#define YPBINDLOCK "/var/run/ypbind.lock"
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struct dom_binding *_ypbindlist;
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char _yp_domain[MAXHOSTNAMELEN];
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#define YPLIB_TIMEOUT 10
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#define YPLIB_RPC_RETRIES 4
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struct timeval _yplib_timeout = { YPLIB_TIMEOUT, 0 };
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struct timeval _yplib_rpc_timeout = { YPLIB_TIMEOUT / YPLIB_RPC_RETRIES,
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1000000 * (YPLIB_TIMEOUT % YPLIB_RPC_RETRIES) / YPLIB_RPC_RETRIES };
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int _yplib_nerrs = 5;
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#ifdef __weak_alias
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__weak_alias(yp_bind, _yp_bind)
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__weak_alias(yp_unbind, _yp_unbind)
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__weak_alias(yp_get_default_domain, _yp_get_default_domain)
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#endif
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int
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_yp_dobind(dom, ypdb)
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const char *dom;
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struct dom_binding **ypdb;
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{
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static int pid = -1;
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char path[MAXPATHLEN];
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struct dom_binding *ysd, *ysd2;
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struct ypbind_resp ypbr;
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struct sockaddr_in clnt_sin;
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int clnt_sock, fd, gpid;
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CLIENT *client;
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int new = 0, r;
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int nerrs = 0;
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if (dom == NULL || *dom == '\0')
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return YPERR_BADARGS;
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/*
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* test if YP is running or not
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*/
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if ((fd = open(YPBINDLOCK, O_RDONLY)) == -1)
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return YPERR_YPBIND;
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if (!(flock(fd, LOCK_EX | LOCK_NB) == -1 && errno == EWOULDBLOCK)) {
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(void)close(fd);
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return YPERR_YPBIND;
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}
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(void)close(fd);
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gpid = getpid();
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if (!(pid == -1 || pid == gpid)) {
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ysd = _ypbindlist;
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while (ysd) {
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if (ysd->dom_client)
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clnt_destroy(ysd->dom_client);
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ysd2 = ysd->dom_pnext;
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free(ysd);
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ysd = ysd2;
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}
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_ypbindlist = NULL;
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}
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pid = gpid;
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if (ypdb != NULL)
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*ypdb = NULL;
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for (ysd = _ypbindlist; ysd; ysd = ysd->dom_pnext)
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if (strcmp(dom, ysd->dom_domain) == 0)
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break;
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if (ysd == NULL) {
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if ((ysd = malloc(sizeof *ysd)) == NULL)
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return YPERR_YPERR;
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(void)memset(ysd, 0, sizeof *ysd);
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ysd->dom_socket = -1;
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ysd->dom_vers = 0;
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new = 1;
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}
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again:
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if (ysd->dom_vers == 0) {
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(void) snprintf(path, sizeof(path), "%s/%s.%d",
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BINDINGDIR, dom, 2);
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if ((fd = open(path, O_RDONLY)) == -1) {
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/*
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* no binding file, YP is dead, or not yet fully
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* alive.
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*/
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goto trynet;
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}
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if (flock(fd, LOCK_EX | LOCK_NB) == -1 &&
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errno == EWOULDBLOCK) {
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struct iovec iov[2];
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struct ypbind_resp ybr;
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u_short ypb_port;
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struct ypbind_binding *bn;
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iov[0].iov_base = &ypb_port;
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iov[0].iov_len = sizeof ypb_port;
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iov[1].iov_base = &ybr;
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iov[1].iov_len = sizeof ybr;
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r = readv(fd, iov, 2);
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if (r != iov[0].iov_len + iov[1].iov_len) {
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(void)close(fd);
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ysd->dom_vers = -1;
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goto again;
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}
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(void)memset(&ysd->dom_server_addr, 0,
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sizeof ysd->dom_server_addr);
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ysd->dom_server_addr.sin_len =
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sizeof(struct sockaddr_in);
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ysd->dom_server_addr.sin_family = AF_INET;
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bn = &ybr.ypbind_respbody.ypbind_bindinfo;
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ysd->dom_server_addr.sin_port =
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bn->ypbind_binding_port;
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ysd->dom_server_addr.sin_addr =
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bn->ypbind_binding_addr;
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ysd->dom_server_port = ysd->dom_server_addr.sin_port;
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(void)close(fd);
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goto gotit;
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} else {
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/* no lock on binding file, YP is dead. */
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(void)close(fd);
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if (new)
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free(ysd);
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return YPERR_YPBIND;
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}
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}
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trynet:
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if (ysd->dom_vers == -1 || ysd->dom_vers == 0) {
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struct ypbind_binding *bn;
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(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;
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clnt_sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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clnt_sock = RPC_ANYSOCK;
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client = clnttcp_create(&clnt_sin, YPBINDPROG, YPBINDVERS,
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&clnt_sock, 0, 0);
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if (client == NULL) {
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clnt_pcreateerror("clnttcp_create");
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if (new)
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free(ysd);
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return YPERR_YPBIND;
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}
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r = clnt_call(client, (rpcproc_t)YPBINDPROC_DOMAIN,
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(xdrproc_t)xdr_ypdomain_wrap_string, &dom,
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(xdrproc_t)xdr_ypbind_resp, &ypbr, _yplib_timeout);
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if (r != RPC_SUCCESS) {
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if (new == 0 && ++nerrs == _yplib_nerrs) {
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nerrs = 0;
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fprintf(stderr,
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"YP server for domain %s not responding, still trying\n",
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dom);
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}
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clnt_destroy(client);
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ysd->dom_vers = -1;
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goto again;
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}
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clnt_destroy(client);
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(void)memset(&ysd->dom_server_addr, 0,
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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;
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bn = &ypbr.ypbind_respbody.ypbind_bindinfo;
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ysd->dom_server_addr.sin_port =
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bn->ypbind_binding_port;
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ysd->dom_server_addr.sin_addr.s_addr =
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bn->ypbind_binding_addr.s_addr;
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ysd->dom_server_port =
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bn->ypbind_binding_port;
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gotit:
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ysd->dom_vers = YPVERS;
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(void)strncpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain)-1);
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}
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if (ysd->dom_client)
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clnt_destroy(ysd->dom_client);
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ysd->dom_socket = RPC_ANYSOCK;
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ysd->dom_client = clntudp_create(&ysd->dom_server_addr,
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YPPROG, YPVERS, _yplib_rpc_timeout, &ysd->dom_socket);
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if (ysd->dom_client == NULL) {
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clnt_pcreateerror("clntudp_create");
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ysd->dom_vers = -1;
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goto again;
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}
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if (fcntl(ysd->dom_socket, F_SETFD, 1) == -1)
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perror("fcntl: F_SETFD");
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if (new) {
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ysd->dom_pnext = _ypbindlist;
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_ypbindlist = ysd;
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}
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if (ypdb != NULL)
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*ypdb = ysd;
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return 0;
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}
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void
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__yp_unbind(ypb)
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struct dom_binding *ypb;
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{
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_DIAGASSERT(ypb != NULL);
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clnt_destroy(ypb->dom_client);
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ypb->dom_client = NULL;
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ypb->dom_socket = -1;
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}
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int
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yp_bind(dom)
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const char *dom;
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{
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if (_yp_invalid_domain(dom))
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return YPERR_BADARGS;
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return _yp_dobind(dom, NULL);
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}
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void
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yp_unbind(dom)
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const char *dom;
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{
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struct dom_binding *ypb, *ypbp;
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if (_yp_invalid_domain(dom))
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return;
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ypbp = NULL;
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for (ypb = _ypbindlist; ypb; ypb = ypb->dom_pnext) {
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if (strcmp(dom, ypb->dom_domain) == 0) {
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clnt_destroy(ypb->dom_client);
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if (ypbp)
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ypbp->dom_pnext = ypb->dom_pnext;
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else
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_ypbindlist = ypb->dom_pnext;
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free(ypb);
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return;
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}
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ypbp = ypb;
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}
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return;
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}
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int
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yp_get_default_domain(domp)
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char **domp;
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{
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if (domp == NULL)
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return YPERR_BADARGS;
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*domp = NULL;
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if (_yp_domain[0] == '\0')
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if (getdomainname(_yp_domain, sizeof _yp_domain))
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return YPERR_NODOM;
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*domp = _yp_domain;
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return 0;
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}
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int
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_yp_check(dom)
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char **dom;
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{
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char *unused;
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if (_yp_domain[0] == '\0')
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if (yp_get_default_domain(&unused))
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return 0;
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if (dom)
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*dom = _yp_domain;
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if (yp_bind(_yp_domain) == 0)
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return 1;
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return 0;
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}
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/*
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* _yp_invalid_domain: check if given domainname isn't legal.
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* returns non-zero if invalid
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*/
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int
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_yp_invalid_domain(dom)
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const char *dom;
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{
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if (dom == NULL || *dom == '\0')
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return 1;
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if (strlen(dom) > YPMAXDOMAIN)
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return 1;
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if (strchr(dom, '/') != NULL)
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return 1;
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return 0;
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}
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