741 lines
20 KiB
C
741 lines
20 KiB
C
/* $NetBSD: getnetconfig.c,v 1.3 2000/07/06 03:10:34 christos Exp $ */
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/*-
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* Copyright (c) 2009, Sun Microsystems, Inc.
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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 are met:
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of Sun Microsystems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getnetconfig.c 1.12 91/12/19 SMI";
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Copyright (c) 1989 by Sun Microsystems, Inc.
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*/
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#include "namespace.h"
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#include "reentrant.h"
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#include <stdio.h>
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#include <errno.h>
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#include <netconfig.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include "rpc_com.h"
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/*
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* The five library routines in this file provide application access to the
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* system network configuration database, /etc/netconfig. In addition to the
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* netconfig database and the routines for accessing it, the environment
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* variable NETPATH and its corresponding routines in getnetpath.c may also be
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* used to specify the network transport to be used.
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*/
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/*
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* netconfig errors
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*/
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#define NC_NONETCONFIG ENOENT
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#define NC_NOMEM ENOMEM
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#define NC_NOTINIT EINVAL /* setnetconfig was not called first */
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#define NC_BADFILE EBADF /* format for netconfig file is bad */
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#define NC_NOTFOUND ENOPROTOOPT /* specified netid was not found */
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/*
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* semantics as strings (should be in netconfig.h)
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*/
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#define NC_TPI_CLTS_S "tpi_clts"
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#define NC_TPI_COTS_S "tpi_cots"
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#define NC_TPI_COTS_ORD_S "tpi_cots_ord"
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#define NC_TPI_RAW_S "tpi_raw"
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/*
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* flags as characters (also should be in netconfig.h)
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*/
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#define NC_NOFLAG_C '-'
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#define NC_VISIBLE_C 'v'
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#define NC_BROADCAST_C 'b'
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/*
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* Character used to indicate there is no name-to-address lookup library
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*/
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#define NC_NOLOOKUP "-"
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static const char * const _nc_errors[] = {
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"Netconfig database not found",
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"Not enough memory",
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"Not initialized",
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"Netconfig database has invalid format",
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"Netid not found in netconfig database"
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};
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struct netconfig_info {
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int eof; /* all entries has been read */
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int ref; /* # of times setnetconfig() has been called */
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struct netconfig_list *head; /* head of the list */
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struct netconfig_list *tail; /* last of the list */
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};
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struct netconfig_list {
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char *linep; /* hold line read from netconfig */
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struct netconfig *ncp;
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struct netconfig_list *next;
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};
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struct netconfig_vars {
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int valid; /* token that indicates a valid netconfig_vars */
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int flag; /* first time flag */
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struct netconfig_list *nc_configs; /* pointer to the current netconfig entry */
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};
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#define NC_VALID 0xfeed
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#define NC_STORAGE 0xf00d
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#define NC_INVALID 0
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static int *__nc_error(void);
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static int parse_ncp(char *, struct netconfig *);
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static struct netconfig *dup_ncp(struct netconfig *);
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static FILE *nc_file; /* for netconfig db */
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static mutex_t nc_file_lock = MUTEX_INITIALIZER;
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static struct netconfig_info ni = { 0, 0, NULL, NULL};
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static mutex_t ni_lock = MUTEX_INITIALIZER;
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static thread_key_t nc_key;
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static once_t nc_once = ONCE_INITIALIZER;
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static int nc_key_error;
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static void
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nc_key_init(void)
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{
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nc_key_error = thr_keycreate(&nc_key, free);
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}
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#define MAXNETCONFIGLINE 1000
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static int *
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__nc_error()
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{
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static int nc_error = 0;
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int *nc_addr;
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/*
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* Use the static `nc_error' if we are the main thread
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* (including non-threaded programs), or if an allocation
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* fails.
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*/
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if (thr_main())
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return (&nc_error);
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if (thr_once(&nc_once, nc_key_init) != 0 || nc_key_error != 0)
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return (&nc_error);
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if ((nc_addr = (int *)thr_getspecific(nc_key)) == NULL) {
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nc_addr = (int *)malloc(sizeof (int));
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if (thr_setspecific(nc_key, (void *) nc_addr) != 0) {
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if (nc_addr)
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free(nc_addr);
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return (&nc_error);
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}
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*nc_addr = 0;
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}
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return (nc_addr);
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}
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#define nc_error (*(__nc_error()))
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/*
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* A call to setnetconfig() establishes a /etc/netconfig "session". A session
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* "handle" is returned on a successful call. At the start of a session (after
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* a call to setnetconfig()) searches through the /etc/netconfig database will
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* proceed from the start of the file. The session handle must be passed to
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* getnetconfig() to parse the file. Each call to getnetconfig() using the
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* current handle will process one subsequent entry in /etc/netconfig.
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* setnetconfig() must be called before the first call to getnetconfig().
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* (Handles are used to allow for nested calls to setnetpath()).
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*
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* A new session is established with each call to setnetconfig(), with a new
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* handle being returned on each call. Previously established sessions remain
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* active until endnetconfig() is called with that session's handle as an
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* argument.
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*
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* setnetconfig() need *not* be called before a call to getnetconfigent().
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* setnetconfig() returns a NULL pointer on failure (for example, if
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* the netconfig database is not present).
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*/
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void *
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setnetconfig()
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{
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struct netconfig_vars *nc_vars;
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if ((nc_vars = (struct netconfig_vars *)malloc(sizeof
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(struct netconfig_vars))) == NULL) {
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return(NULL);
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}
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/*
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* For multiple calls, i.e. nc_file is not NULL, we just return the
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* handle without reopening the netconfig db.
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*/
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mutex_lock(&ni_lock);
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ni.ref++;
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mutex_unlock(&ni_lock);
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mutex_lock(&nc_file_lock);
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if ((nc_file != NULL) || (nc_file = fopen(NETCONFIG, "r")) != NULL) {
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nc_vars->valid = NC_VALID;
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nc_vars->flag = 0;
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nc_vars->nc_configs = ni.head;
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mutex_unlock(&nc_file_lock);
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return ((void *)nc_vars);
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}
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mutex_unlock(&nc_file_lock);
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mutex_lock(&ni_lock);
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ni.ref--;
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mutex_unlock(&ni_lock);
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nc_error = NC_NONETCONFIG;
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free(nc_vars);
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return (NULL);
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}
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/*
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* When first called, getnetconfig() returns a pointer to the first entry in
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* the netconfig database, formatted as a struct netconfig. On each subsequent
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* call, getnetconfig() returns a pointer to the next entry in the database.
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* getnetconfig() can thus be used to search the entire netconfig file.
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* getnetconfig() returns NULL at end of file.
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*/
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struct netconfig *
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getnetconfig(handlep)
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void *handlep;
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{
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struct netconfig_vars *ncp = (struct netconfig_vars *)handlep;
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char *stringp; /* tmp string pointer */
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struct netconfig_list *list;
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struct netconfig *np;
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struct netconfig *result;
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/*
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* Verify that handle is valid
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*/
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mutex_lock(&nc_file_lock);
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if (ncp == NULL || nc_file == NULL) {
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nc_error = NC_NOTINIT;
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mutex_unlock(&nc_file_lock);
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return (NULL);
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}
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mutex_unlock(&nc_file_lock);
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switch (ncp->valid) {
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case NC_VALID:
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/*
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* If entry has already been read into the list,
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* we return the entry in the linked list.
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* If this is the first time call, check if there are any entries in
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* linked list. If no entries, we need to read the netconfig db.
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* If we have been here and the next entry is there, we just return
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* it.
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*/
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if (ncp->flag == 0) { /* first time */
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ncp->flag = 1;
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mutex_lock(&ni_lock);
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ncp->nc_configs = ni.head;
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mutex_unlock(&ni_lock);
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if (ncp->nc_configs != NULL) /* entry already exist */
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return(ncp->nc_configs->ncp);
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}
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else if (ncp->nc_configs != NULL && ncp->nc_configs->next != NULL) {
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ncp->nc_configs = ncp->nc_configs->next;
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return(ncp->nc_configs->ncp);
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}
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/*
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* If we cannot find the entry in the list and is end of file,
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* we give up.
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*/
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mutex_lock(&ni_lock);
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if (ni.eof == 1) {
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mutex_unlock(&ni_lock);
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return(NULL);
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}
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mutex_unlock(&ni_lock);
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break;
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default:
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nc_error = NC_NOTINIT;
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return (NULL);
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}
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stringp = (char *) malloc(MAXNETCONFIGLINE);
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if (stringp == NULL)
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return (NULL);
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#ifdef MEM_CHK
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if (malloc_verify() == 0) {
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fprintf(stderr, "memory heap corrupted in getnetconfig\n");
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exit(1);
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}
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#endif
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/*
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* Read a line from netconfig file.
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*/
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mutex_lock(&nc_file_lock);
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do {
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if (fgets(stringp, MAXNETCONFIGLINE, nc_file) == NULL) {
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free(stringp);
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mutex_lock(&ni_lock);
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ni.eof = 1;
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mutex_unlock(&ni_lock);
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mutex_unlock(&nc_file_lock);
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return (NULL);
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}
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} while (*stringp == '#');
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mutex_unlock(&nc_file_lock);
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list = (struct netconfig_list *) malloc(sizeof (struct netconfig_list));
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if (list == NULL) {
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free(stringp);
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return(NULL);
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}
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np = (struct netconfig *) malloc(sizeof (struct netconfig));
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if (np == NULL) {
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free(stringp);
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free(list);
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return(NULL);
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}
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list->ncp = np;
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list->next = NULL;
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list->ncp->nc_lookups = NULL;
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list->linep = stringp;
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if (parse_ncp(stringp, list->ncp) == -1) {
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free(stringp);
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free(np);
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free(list);
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return (NULL);
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}
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else {
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/*
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* If this is the first entry that's been read, it is the head of
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* the list. If not, put the entry at the end of the list.
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* Reposition the current pointer of the handle to the last entry
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* in the list.
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*/
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mutex_lock(&ni_lock);
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if (ni.head == NULL) { /* first entry */
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ni.head = ni.tail = list;
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}
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else {
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ni.tail->next = list;
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ni.tail = ni.tail->next;
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}
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ncp->nc_configs = ni.tail;
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result = ni.tail->ncp;
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mutex_unlock(&ni_lock);
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return(result);
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}
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}
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/*
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* endnetconfig() may be called to "unbind" or "close" the netconfig database
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* when processing is complete, releasing resources for reuse. endnetconfig()
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* may not be called before setnetconfig(). endnetconfig() returns 0 on
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* success and -1 on failure (for example, if setnetconfig() was not called
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* previously).
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*/
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int
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endnetconfig(handlep)
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void *handlep;
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{
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struct netconfig_vars *nc_handlep = (struct netconfig_vars *)handlep;
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struct netconfig_list *q, *p;
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/*
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* Verify that handle is valid
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*/
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if (nc_handlep == NULL || (nc_handlep->valid != NC_VALID &&
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nc_handlep->valid != NC_STORAGE)) {
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nc_error = NC_NOTINIT;
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return (-1);
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}
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/*
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* Return 0 if anyone still needs it.
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*/
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nc_handlep->valid = NC_INVALID;
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nc_handlep->flag = 0;
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nc_handlep->nc_configs = NULL;
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mutex_lock(&ni_lock);
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if (--ni.ref > 0) {
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mutex_unlock(&ni_lock);
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free(nc_handlep);
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return(0);
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}
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/*
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* Noone needs these entries anymore, then frees them.
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* Make sure all info in netconfig_info structure has been reinitialized.
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*/
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q = ni.head;
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ni.eof = ni.ref = 0;
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ni.head = NULL;
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ni.tail = NULL;
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mutex_unlock(&ni_lock);
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while (q != NULL) {
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p = q->next;
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if (q->ncp->nc_lookups != NULL) free(q->ncp->nc_lookups);
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free(q->ncp);
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free(q->linep);
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free(q);
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q = p;
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}
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free(nc_handlep);
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mutex_lock(&nc_file_lock);
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fclose(nc_file);
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nc_file = NULL;
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mutex_unlock(&nc_file_lock);
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return (0);
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}
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/*
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* getnetconfigent(netid) returns a pointer to the struct netconfig structure
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* corresponding to netid. It returns NULL if netid is invalid (that is, does
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* not name an entry in the netconfig database). It returns NULL and sets
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* errno in case of failure (for example, if the netconfig database cannot be
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* opened).
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*/
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struct netconfig *
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getnetconfigent(netid)
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const char *netid;
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{
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FILE *file; /* NETCONFIG db's file pointer */
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char *linep; /* holds current netconfig line */
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char *stringp; /* temporary string pointer */
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struct netconfig *ncp = NULL; /* returned value */
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struct netconfig_list *list; /* pointer to cache list */
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nc_error = NC_NOTFOUND; /* default error. */
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if (netid == NULL || strlen(netid) == 0) {
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return (NULL);
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}
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/*
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* Look up table if the entries have already been read and parsed in
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* getnetconfig(), then copy this entry into a buffer and return it.
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* If we cannot find the entry in the current list and there are more
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* entries in the netconfig db that has not been read, we then read the
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* db and try find the match netid.
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* If all the netconfig db has been read and placed into the list and
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* there is no match for the netid, return NULL.
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*/
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mutex_lock(&ni_lock);
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if (ni.head != NULL) {
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for (list = ni.head; list; list = list->next) {
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if (strcmp(list->ncp->nc_netid, netid) == 0) {
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mutex_unlock(&ni_lock);
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return(dup_ncp(list->ncp));
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}
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}
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if (ni.eof == 1) { /* that's all the entries */
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mutex_unlock(&ni_lock);
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return(NULL);
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}
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}
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mutex_unlock(&ni_lock);
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if ((file = fopen(NETCONFIG, "r")) == NULL) {
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nc_error = NC_NONETCONFIG;
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return (NULL);
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}
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if ((linep = malloc(MAXNETCONFIGLINE)) == NULL) {
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fclose(file);
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nc_error = NC_NOMEM;
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return (NULL);
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}
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do {
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ptrdiff_t len;
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char *tmpp; /* tmp string pointer */
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do {
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if ((stringp = fgets(linep, MAXNETCONFIGLINE, file)) == NULL) {
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break;
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}
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} while (*stringp == '#');
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if (stringp == NULL) { /* eof */
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break;
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}
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if ((tmpp = strpbrk(stringp, "\t ")) == NULL) { /* can't parse file */
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nc_error = NC_BADFILE;
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break;
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}
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if (strlen(netid) == (size_t) (len = tmpp - stringp) && /* a match */
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strncmp(stringp, netid, (size_t)len) == 0) {
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if ((ncp = (struct netconfig *)
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malloc(sizeof (struct netconfig))) == NULL) {
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break;
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}
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ncp->nc_lookups = NULL;
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if (parse_ncp(linep, ncp) == -1) {
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free(ncp);
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ncp = NULL;
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}
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break;
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}
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} while (stringp != NULL);
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if (ncp == NULL) {
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free(linep);
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|
}
|
|
fclose(file);
|
|
return(ncp);
|
|
}
|
|
|
|
/*
|
|
* freenetconfigent(netconfigp) frees the netconfig structure pointed to by
|
|
* netconfigp (previously returned by getnetconfigent()).
|
|
*/
|
|
|
|
void
|
|
freenetconfigent(netconfigp)
|
|
struct netconfig *netconfigp;
|
|
{
|
|
if (netconfigp != NULL) {
|
|
free(netconfigp->nc_netid); /* holds all netconfigp's strings */
|
|
if (netconfigp->nc_lookups != NULL)
|
|
free(netconfigp->nc_lookups);
|
|
free(netconfigp);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Parse line and stuff it in a struct netconfig
|
|
* Typical line might look like:
|
|
* udp tpi_cots vb inet udp /dev/udp /usr/lib/ip.so,/usr/local/ip.so
|
|
*
|
|
* We return -1 if any of the tokens don't parse, or malloc fails.
|
|
*
|
|
* Note that we modify stringp (putting NULLs after tokens) and
|
|
* we set the ncp's string field pointers to point to these tokens within
|
|
* stringp.
|
|
*/
|
|
|
|
static int
|
|
parse_ncp(stringp, ncp)
|
|
char *stringp; /* string to parse */
|
|
struct netconfig *ncp; /* where to put results */
|
|
{
|
|
char *tokenp; /* for processing tokens */
|
|
char *lasts;
|
|
char **nc_lookups;
|
|
|
|
nc_error = NC_BADFILE; /* nearly anything that breaks is for this reason */
|
|
stringp[strlen(stringp)-1] = '\0'; /* get rid of newline */
|
|
/* netid */
|
|
if ((ncp->nc_netid = strtok_r(stringp, "\t ", &lasts)) == NULL) {
|
|
return (-1);
|
|
}
|
|
|
|
/* semantics */
|
|
if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) {
|
|
return (-1);
|
|
}
|
|
if (strcmp(tokenp, NC_TPI_COTS_ORD_S) == 0)
|
|
ncp->nc_semantics = NC_TPI_COTS_ORD;
|
|
else if (strcmp(tokenp, NC_TPI_COTS_S) == 0)
|
|
ncp->nc_semantics = NC_TPI_COTS;
|
|
else if (strcmp(tokenp, NC_TPI_CLTS_S) == 0)
|
|
ncp->nc_semantics = NC_TPI_CLTS;
|
|
else if (strcmp(tokenp, NC_TPI_RAW_S) == 0)
|
|
ncp->nc_semantics = NC_TPI_RAW;
|
|
else
|
|
return (-1);
|
|
|
|
/* flags */
|
|
if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) {
|
|
return (-1);
|
|
}
|
|
for (ncp->nc_flag = NC_NOFLAG; *tokenp != '\0';
|
|
tokenp++) {
|
|
switch (*tokenp) {
|
|
case NC_NOFLAG_C:
|
|
break;
|
|
case NC_VISIBLE_C:
|
|
ncp->nc_flag |= NC_VISIBLE;
|
|
break;
|
|
case NC_BROADCAST_C:
|
|
ncp->nc_flag |= NC_BROADCAST;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
}
|
|
/* protocol family */
|
|
if ((ncp->nc_protofmly = strtok_r(NULL, "\t ", &lasts)) == NULL) {
|
|
return (-1);
|
|
}
|
|
/* protocol name */
|
|
if ((ncp->nc_proto = strtok_r(NULL, "\t ", &lasts)) == NULL) {
|
|
return (-1);
|
|
}
|
|
/* network device */
|
|
if ((ncp->nc_device = strtok_r(NULL, "\t ", &lasts)) == NULL) {
|
|
return (-1);
|
|
}
|
|
if ((tokenp = strtok_r(NULL, "\t ", &lasts)) == NULL) {
|
|
return (-1);
|
|
}
|
|
if (strcmp(tokenp, NC_NOLOOKUP) == 0) {
|
|
ncp->nc_nlookups = 0;
|
|
ncp->nc_lookups = NULL;
|
|
} else {
|
|
char *cp; /* tmp string */
|
|
|
|
if (ncp->nc_lookups != NULL) /* from last visit */
|
|
free(ncp->nc_lookups);
|
|
ncp->nc_lookups = NULL;
|
|
ncp->nc_nlookups = 0;
|
|
while ((cp = tokenp) != NULL) {
|
|
if ((nc_lookups = realloc(ncp->nc_lookups,
|
|
(ncp->nc_nlookups + 1) * sizeof *ncp->nc_lookups)) == NULL) {
|
|
free(ncp->nc_lookups);
|
|
ncp->nc_lookups = NULL;
|
|
return (-1);
|
|
}
|
|
tokenp = _get_next_token(cp, ',');
|
|
ncp->nc_lookups = nc_lookups;
|
|
ncp->nc_lookups[ncp->nc_nlookups++] = cp;
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Returns a string describing the reason for failure.
|
|
*/
|
|
char *
|
|
nc_sperror()
|
|
{
|
|
const char *message;
|
|
|
|
switch(nc_error) {
|
|
case NC_NONETCONFIG:
|
|
message = _nc_errors[0];
|
|
break;
|
|
case NC_NOMEM:
|
|
message = _nc_errors[1];
|
|
break;
|
|
case NC_NOTINIT:
|
|
message = _nc_errors[2];
|
|
break;
|
|
case NC_BADFILE:
|
|
message = _nc_errors[3];
|
|
break;
|
|
case NC_NOTFOUND:
|
|
message = _nc_errors[4];
|
|
break;
|
|
default:
|
|
message = "Unknown network selection error";
|
|
}
|
|
/* LINTED const castaway */
|
|
return ((char *)message);
|
|
}
|
|
|
|
/*
|
|
* Prints a message onto standard error describing the reason for failure.
|
|
*/
|
|
void
|
|
nc_perror(s)
|
|
const char *s;
|
|
{
|
|
fprintf(stderr, "%s: %s\n", s, nc_sperror());
|
|
}
|
|
|
|
/*
|
|
* Duplicates the matched netconfig buffer.
|
|
*/
|
|
static struct netconfig *
|
|
dup_ncp(ncp)
|
|
struct netconfig *ncp;
|
|
{
|
|
struct netconfig *p;
|
|
char *tmp;
|
|
u_int i;
|
|
|
|
if ((tmp=malloc(MAXNETCONFIGLINE)) == NULL)
|
|
return(NULL);
|
|
if ((p=(struct netconfig *)malloc(sizeof(struct netconfig))) == NULL) {
|
|
free(tmp);
|
|
return(NULL);
|
|
}
|
|
/*
|
|
* First we dup all the data from matched netconfig buffer. Then we
|
|
* adjust some of the member pointer to a pre-allocated buffer where
|
|
* contains part of the data.
|
|
* To follow the convention used in parse_ncp(), we store all the
|
|
* necessary information in the pre-allocated buffer and let each
|
|
* of the netconfig char pointer member point to the right address
|
|
* in the buffer.
|
|
*/
|
|
*p = *ncp;
|
|
p->nc_netid = (char *)strcpy(tmp,ncp->nc_netid);
|
|
tmp = strchr(tmp, '\0') + 1;
|
|
p->nc_protofmly = (char *)strcpy(tmp,ncp->nc_protofmly);
|
|
tmp = strchr(tmp, '\0') + 1;
|
|
p->nc_proto = (char *)strcpy(tmp,ncp->nc_proto);
|
|
tmp = strchr(tmp, '\0') + 1;
|
|
p->nc_device = (char *)strcpy(tmp,ncp->nc_device);
|
|
p->nc_lookups = (char **)malloc((size_t)(p->nc_nlookups+1) * sizeof(char *));
|
|
if (p->nc_lookups == NULL) {
|
|
free(p->nc_netid);
|
|
free(p);
|
|
return(NULL);
|
|
}
|
|
for (i=0; i < p->nc_nlookups; i++) {
|
|
tmp = strchr(tmp, '\0') + 1;
|
|
p->nc_lookups[i] = (char *)strcpy(tmp,ncp->nc_lookups[i]);
|
|
}
|
|
return(p);
|
|
}
|