ad4dda469f
This patch contains changes to NetBSD libc code base to make it compile and work on Minix. Some of them are due to actual NetBSD libc bugs, as we're compiling it in non-reentrant mode and with a.out support, something not exactly frequent in NetBSD. Others are proper fixes to port it to Minix (mostly sa_len parameter missing in socket and a few mmap from files).
375 lines
8.7 KiB
C
375 lines
8.7 KiB
C
/* $NetBSD: yplib.c,v 1.43 2006/11/03 20:18:49 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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*
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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 1.43 2006/11/03 20:18:49 christos Exp $");
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#endif
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#include "namespace.h"
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#include "reentrant.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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#ifdef _REENTRANT
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static mutex_t _ypmutex = MUTEX_INITIALIZER;
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#define YPLOCK() mutex_lock(&_ypmutex)
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#define YPUNLOCK() mutex_unlock(&_ypmutex)
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#else
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#define YPLOCK()
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#define YPUNLOCK()
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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;
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int nerrs = 0;
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ssize_t r;
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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 != (ssize_t)(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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#ifndef __minix
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ysd->dom_server_addr.sin_len =
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sizeof(struct sockaddr_in);
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#endif /* !__minix */
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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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#ifndef __minix
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clnt_sin.sin_len = sizeof(struct sockaddr_in);
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#endif /* !__minix */
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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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#ifndef __minix
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ysd->dom_server_addr.sin_len = sizeof(struct sockaddr_in);
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#endif /* !__minix */
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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)strlcpy(ysd->dom_domain, dom, sizeof(ysd->dom_domain));
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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, FD_CLOEXEC) == -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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int good;
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YPLOCK();
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if (_yp_domain[0] == '\0')
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if (yp_get_default_domain(&unused)) {
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good = 0;
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goto done;
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}
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if (dom)
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*dom = _yp_domain;
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good = yp_bind(_yp_domain) == 0;
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done:
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YPUNLOCK();
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return good;
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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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