config.c

DHCPv6协议在Linux操作系统下的一个客户端实现。

/*	$Id: config.c,v 1.9 2003/04/12 00:25:32 shirleyma Exp $	*/
/*	ported from KAME: config.c,v 1.21 2002/09/24 14:20:49 itojun Exp */

/*
 * Copyright (C) 2002 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
#include <sys/types.h>
#include <sys/socket.h>

#include <net/if.h>

#include <netinet/in.h>

#include <syslog.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ifaddrs.h>

#include "queue.h"
#include "dhcp6.h"
#include "config.h"
#include "common.h"

extern int errno;

static struct dhcp6_ifconf *dhcp6_ifconflist;
static struct host_conf *host_conflist0, *host_conflist;
static struct dhcp6_list dnslist0; 

enum { DHCPOPTCODE_SEND, DHCPOPTCODE_REQUEST, DHCPOPTCODE_ALLOW };

static int add_options __P((int, struct dhcp6_ifconf *, struct cf_list *));
static int add_address __P((struct dhcp6_list *, struct dhcp6_addr *));
static void clear_ifconf __P((struct dhcp6_ifconf *));
static void clear_hostconf __P((struct host_conf *));
static void clear_options __P((struct dhcp6_optconf *));

int
configure_interface(const struct cf_namelist *iflist)
{
	const struct cf_namelist *ifp;
	struct dhcp6_ifconf *ifc;

	for (ifp = iflist; ifp; ifp = ifp->next) {
		struct cf_list *cfl;

		if ((ifc = malloc(sizeof(*ifc))) == NULL) {
			dprintf(LOG_ERR, "%s"
				"memory allocation for %s failed", FNAME,
				ifp->name);
			goto bad;
		}
		memset(ifc, 0, sizeof(*ifc));
		ifc->next = dhcp6_ifconflist;
		dhcp6_ifconflist = ifc;

		if ((ifc->ifname = strdup(ifp->name)) == NULL) {
			dprintf(LOG_ERR, "%s" "failed to copy ifname", FNAME);
			goto bad;
		}

		ifc->server_pref = DH6OPT_PREF_UNDEF;
		TAILQ_INIT(&ifc->reqopt_list);
		TAILQ_INIT(&ifc->addr_list);

		for (cfl = ifp->params; cfl; cfl = cfl->next) {
			switch(cfl->type) {
			case DECL_REQUEST:
				if (dhcp6_mode != DHCP6_MODE_CLIENT) {
					dprintf(LOG_INFO, "%s" "%s:%d "
						"client-only configuration",
						FNAME, configfilename,
						cfl->line);
					goto bad;
				}
				if (add_options(DHCPOPTCODE_REQUEST,
						ifc, cfl->list)) {
					goto bad;
				}
				break;
			case DECL_SEND:
				if (add_options(DHCPOPTCODE_SEND,
						ifc, cfl->list)) {
					goto bad;
				}
				break;
			case DECL_ALLOW:
				if (add_options(DHCPOPTCODE_ALLOW,
						ifc, cfl->list)) {
					goto bad;
				}
				break;
			case DECL_INFO_ONLY:
				if (dhcp6_mode == DHCP6_MODE_CLIENT)
					ifc->send_flags |= DHCIFF_INFO_ONLY;
				break;
			case DECL_TEMP_ADDR:
				if (dhcp6_mode == DHCP6_MODE_CLIENT)
					ifc->send_flags |= DHCIFF_TEMP_ADDRS;
				break;
			case DECL_PREFERENCE:
				if (dhcp6_mode != DHCP6_MODE_SERVER) {
					dprintf(LOG_INFO, "%s" "%s:%d "
						"server-only configuration",
						FNAME, configfilename,
						cfl->line);
					goto bad;
				}
				ifc->server_pref = (int)cfl->num;
				if (ifc->server_pref < 0 ||
				    ifc->server_pref > 255) {
					dprintf(LOG_INFO, "%s" "%s:%d "
						"bad value: %d", FNAME,
						configfilename, cfl->line,
						ifc->server_pref);
					goto bad;
				}
				break;
			case DECL_IAID:
				if (ifc->iaidinfo.iaid) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated IAID for %s",
						FNAME, configfilename,
						cfl->line, ifc->ifname);
					goto bad;
				} else
					ifc->iaidinfo.iaid = (u_int32_t)cfl->num;
				break;
			case DECL_RENEWTIME:
				if (ifc->iaidinfo.renewtime) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated renewtime for %s",
						FNAME, configfilename,
						cfl->line, ifc->ifname);
					goto bad;
				} else
					ifc->iaidinfo.renewtime = (u_int32_t)cfl->num;
				break;
			case DECL_REBINDTIME:
				if (ifc->iaidinfo.iaid) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated rebindtime for %s",
						FNAME, configfilename,
						cfl->line, ifc->ifname);
					goto bad;
				} else 
					ifc->iaidinfo.rebindtime = (u_int32_t)cfl->num;
				break;
			case DECL_ADDRESS:
				if (add_address(&ifc->addr_list, cfl->ptr)) {
					dprintf(LOG_ERR, "%s" "failed "
						"to configure ipv6address for %s",
						FNAME, ifc->ifname);
					goto bad;
				}
				break;
			case DECL_PREFIX_REQ:
				/* XX: ToDo */
				break;
			case DECL_PREFIX_INFO:
				break;
			default:
				dprintf(LOG_ERR, "%s" "%s:%d "
					"invalid interface configuration",
					FNAME, configfilename, cfl->line);
				goto bad;
			}
		}
	}
	
	return (0);

  bad:
	clear_ifconf(dhcp6_ifconflist);
	dhcp6_ifconflist = NULL;
	return (-1);
}

int
configure_host(const struct cf_namelist *hostlist)
{
	const struct cf_namelist *host;
	struct host_conf *hconf;
	
	for (host = hostlist; host; host = host->next) {
		struct cf_list *cfl;

		if ((hconf = malloc(sizeof(*hconf))) == NULL) {
			dprintf(LOG_ERR, "%s" "memory allocation failed "
				"for host %s", FNAME, host->name);
			goto bad;
		}
		memset(hconf, 0, sizeof(*hconf));
		TAILQ_INIT(&hconf->addr_list);
		TAILQ_INIT(&hconf->addr_binding_list);
		TAILQ_INIT(&hconf->prefix_list);
		TAILQ_INIT(&hconf->prefix_binding_list);
		hconf->next = host_conflist0;
		host_conflist0 = hconf;

		if ((hconf->name = strdup(host->name)) == NULL) {
			dprintf(LOG_ERR, "%s" "failed to copy host name: %s",
				FNAME, host->name);
			goto bad;
		}

		for (cfl = host->params; cfl; cfl = cfl->next) {
			switch(cfl->type) {
			case DECL_DUID:
				if (hconf->duid.duid_id) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated DUID for %s",
						FNAME, configfilename,
						cfl->line, host->name);
					goto bad;
				}
				if ((configure_duid((char *)cfl->ptr,
						    &hconf->duid)) != 0) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"failed to configure "
						"DUID for %s", FNAME,
						configfilename, cfl->line,
						host->name);
					goto bad;
				}
				dprintf(LOG_DEBUG, "%s"
					"configure DUID for %s: %s", FNAME,
					host->name, duidstr(&hconf->duid));
				break;
			case DECL_PREFIX:
				if (add_address(&hconf->prefix_list, cfl->ptr)) {
					dprintf(LOG_ERR, "%s" "failed "
						"to configure prefix for %s",
						FNAME, host->name);
					goto bad;
				}
				break;
			case DECL_IAID:
				if (hconf->iaidinfo.iaid) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated IAID for %s",
						FNAME, configfilename,
						cfl->line, host->name);
					goto bad;
				} else
					hconf->iaidinfo.iaid = (u_int32_t)cfl->num;
				break;
			case DECL_RENEWTIME:
				if (hconf->iaidinfo.renewtime) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated renewtime for %s",
						FNAME, configfilename,
						cfl->line, host->name);
					goto bad;
				} else
					hconf->iaidinfo.renewtime = (u_int32_t)cfl->num;
				break;
			case DECL_REBINDTIME:
				if (hconf->iaidinfo.rebindtime) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated rebindtime for %s",
						FNAME, configfilename,
						cfl->line, host->name);
					goto bad;
				} else 
					hconf->iaidinfo.rebindtime = (u_int32_t)cfl->num;
				break;
			case DECL_ADDRESS:
				if (add_address(&hconf->addr_list, cfl->ptr)) {
					dprintf(LOG_ERR, "%s" "failed "
						"to configure ipv6address for %s",
						FNAME, host->name);
					goto bad;
				}
				break;
			case DECL_LINKLOCAL:
				if (IN6_IS_ADDR_UNSPECIFIED(&hconf->linklocal)) {
					dprintf(LOG_ERR, "%s" "%s:%d "
						"duplicated linklocal for %s",
						FNAME, configfilename,
						cfl->line, host->name);
					goto bad;
				} else 
					memcpy(&hconf->linklocal, cfl->ptr, 
							sizeof(hconf->linklocal) );
				break;
			default:
				dprintf(LOG_ERR, "%s: %d invalid host configuration for %s",
					configfilename, cfl->line, host->name);
				goto bad;
			}
		}
	}

	return (0);

  bad:
	/* there is currently nothing special to recover the error */
	return (-1);