discover.c 41.9 KB
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/* discover.c
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   Find and identify the network interfaces. */
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/*
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 * Copyright (c) 2004-2017 by Internet Systems Consortium, Inc. ("ISC")
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 * Copyright (c) 1995-2003 by Internet Software Consortium
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 *
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 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 *
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 *   Internet Systems Consortium, Inc.
 *   950 Charter Street
 *   Redwood City, CA 94063
 *   <info@isc.org>
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 *   https://www.isc.org/
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 *
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 */

#include "dhcpd.h"
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/* length of line we can read from the IF file, 256 is too small in some cases */
#define IF_LINE_LENGTH 1024

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#define BSD_COMP		/* needed on Solaris for SIOCGLIFNUM */
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#include <sys/ioctl.h>
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#include <errno.h>
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#ifdef HAVE_NET_IF6_H
# include <net/if6.h>
#endif

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struct interface_info *interfaces, *dummy_interfaces, *fallback_interface;
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int interfaces_invalidated;
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int quiet_interface_discovery;
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u_int16_t local_port;
u_int16_t remote_port;
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u_int16_t relay_port = 0;
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int dhcpv4_over_dhcpv6 = 0;
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int (*dhcp_interface_setup_hook) (struct interface_info *, struct iaddr *);
int (*dhcp_interface_discovery_hook) (struct interface_info *);
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isc_result_t (*dhcp_interface_startup_hook) (struct interface_info *);
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int (*dhcp_interface_shutdown_hook) (struct interface_info *);
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struct in_addr limited_broadcast;
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int local_family = AF_INET;
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struct in_addr local_address;
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#ifdef DHCPv6
/*
 * Another clear abuse of the fact that undefined IP addresses are all zeroes.
 */
struct in6_addr local_address6;
int bind_local_address6 = 0;
#endif /* DHCPv6 */

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void (*bootp_packet_handler) (struct interface_info *,
			      struct dhcp_packet *, unsigned,
			      unsigned int,
			      struct iaddr, struct hardware *);
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#ifdef DHCPv6
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void (*dhcpv6_packet_handler)(struct interface_info *,
			      const char *, int,
			      int, const struct iaddr *,
			      isc_boolean_t);
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#endif /* DHCPv6 */
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omapi_object_type_t *dhcp_type_interface;
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#if defined (TRACING)
trace_type_t *interface_trace;
trace_type_t *inpacket_trace;
trace_type_t *outpacket_trace;
#endif
struct interface_info **interface_vector;
int interface_count;
int interface_max;
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OMAPI_OBJECT_ALLOC (interface, struct interface_info, dhcp_type_interface)

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isc_result_t interface_setup ()
{
	isc_result_t status;
	status = omapi_object_type_register (&dhcp_type_interface,
					     "interface",
					     dhcp_interface_set_value,
					     dhcp_interface_get_value,
					     dhcp_interface_destroy,
					     dhcp_interface_signal_handler,
					     dhcp_interface_stuff_values,
					     dhcp_interface_lookup, 
					     dhcp_interface_create,
					     dhcp_interface_remove,
					     0, 0, 0,
					     sizeof (struct interface_info),
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					     interface_initialize, RC_MISC);
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	if (status != ISC_R_SUCCESS)
		log_fatal ("Can't register interface object type: %s",
			   isc_result_totext (status));
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	return status;
}

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#if defined (TRACING)
void interface_trace_setup ()
{
	interface_trace = trace_type_register ("interface", (void *)0,
					       trace_interface_input,
					       trace_interface_stop, MDL);
	inpacket_trace = trace_type_register ("inpacket", (void *)0,
					       trace_inpacket_input,
					       trace_inpacket_stop, MDL);
	outpacket_trace = trace_type_register ("outpacket", (void *)0,
					       trace_outpacket_input,
					       trace_outpacket_stop, MDL);
}
#endif

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isc_result_t interface_initialize (omapi_object_t *ipo,
				   const char *file, int line)
{
	struct interface_info *ip = (struct interface_info *)ipo;
	ip -> rfdesc = ip -> wfdesc = -1;
	return ISC_R_SUCCESS;
}

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/* 
 * Scanning for Interfaces
 * -----------------------
 *
 * To find interfaces, we create an iterator that abstracts out most 
 * of the platform specifics. Use is fairly straightforward:
 *
 * - begin_iface_scan() starts the process.
 * - Use next_iface() until it returns 0.
 * - end_iface_scan() performs any necessary cleanup.
 *
 * We check for errors on each call to next_iface(), which returns a
 * description of the error as a string if any occurs.
 *
 * We currently have code for Solaris and Linux. Other systems need
 * to have code written.
 *
 * NOTE: the long-term goal is to use the interface code from BIND 9.
 */

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#if defined(SIOCGLIFCONF) && defined(SIOCGLIFNUM) && defined(SIOCGLIFFLAGS)

/* HP/UX doesn't define struct lifconf, instead they define struct
 * if_laddrconf.  Similarly, 'struct lifreq' and 'struct lifaddrreq'.
 */
#ifdef ISC_PLATFORM_HAVEIF_LADDRCONF
# define lifc_len iflc_len
# define lifc_buf iflc_buf
# define lifc_req iflc_req
# define LIFCONF if_laddrconf
#else
# define ISC_HAVE_LIFC_FAMILY 1
# define ISC_HAVE_LIFC_FLAGS 1
# define LIFCONF lifconf
#endif

#ifdef ISC_PLATFORM_HAVEIF_LADDRREQ
# define lifr_addr iflr_addr
# define lifr_name iflr_name
# define lifr_dstaddr iflr_dstaddr
# define lifr_flags iflr_flags
# define sockaddr_storage sockaddr_ext
# define ss_family sa_family
# define LIFREQ if_laddrreq
#else
# define LIFREQ lifreq
#endif

#ifndef IF_NAMESIZE
# if defined(LIFNAMSIZ)
#  define IF_NAMESIZE	LIFNAMSIZ
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# elif defined(IFNAMSIZ)
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#  define IF_NAMESIZE	IFNAMSIZ
# else
#  define IF_NAMESIZE	16
# endif
#endif
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#elif !defined(__linux) && !defined(HAVE_IFADDRS_H)
# define SIOCGLIFCONF SIOCGIFCONF
# define SIOCGLIFFLAGS SIOCGIFFLAGS
# define LIFREQ ifreq
# define LIFCONF ifconf
# define lifr_name ifr_name
# define lifr_addr ifr_addr
# define lifr_flags ifr_flags
# define lifc_len ifc_len
# define lifc_buf ifc_buf
# define lifc_req ifc_req
#ifdef _AIX
# define ss_family __ss_family
#endif
#endif
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#if defined(SIOCGLIFCONF) && defined(SIOCGLIFFLAGS)
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/* 
 * Solaris support
 * ---------------
 *
 * The SIOCGLIFCONF ioctl() are the extension that you need to use
 * on Solaris to get information about IPv6 addresses.
 *
 * Solaris' extended interface is documented in the if_tcp man page.
 */

/* 
 * Structure holding state about the scan.
 */
struct iface_conf_list {
	int sock;		/* file descriptor used to get information */
	int num;		/* total number of interfaces */
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	struct LIFCONF conf;	/* structure used to get information */
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	int next;		/* next interface to retrieve when iterating */
};

/* 
 * Structure used to return information about a specific interface.
 */
struct iface_info {
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	char name[IF_NAMESIZE+1];	/* name of the interface, e.g. "bge0" */
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	struct sockaddr_storage addr;	/* address information */
	isc_uint64_t flags;		/* interface flags, e.g. IFF_LOOPBACK */
};

/* 
 * Start a scan of interfaces.
 *
 * The iface_conf_list structure maintains state for this process.
 */
int 
begin_iface_scan(struct iface_conf_list *ifaces) {
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#ifdef ISC_PLATFORM_HAVELIFNUM
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	struct lifnum lifnum;
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#else
	int lifnum;
#endif
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	ifaces->sock = socket(local_family, SOCK_DGRAM, IPPROTO_UDP);
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	if (ifaces->sock < 0) {
		log_error("Error creating socket to list interfaces; %m");
		return 0;
	}

	memset(&lifnum, 0, sizeof(lifnum));
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#ifdef ISC_PLATFORM_HAVELIFNUM
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	lifnum.lifn_family = AF_UNSPEC;
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#endif
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#ifdef SIOCGLIFNUM
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	if (ioctl(ifaces->sock, SIOCGLIFNUM, &lifnum) < 0) {
		log_error("Error finding total number of interfaces; %m");
		close(ifaces->sock);
		ifaces->sock = -1;
		return 0;
	}

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#ifdef ISC_PLATFORM_HAVELIFNUM
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	ifaces->num = lifnum.lifn_count;
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#else
	ifaces->num = lifnum;
#endif
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#else
	ifaces->num = 64;
#endif /* SIOCGLIFNUM */
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	memset(&ifaces->conf, 0, sizeof(ifaces->conf));
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#ifdef ISC_HAVE_LIFC_FAMILY
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	ifaces->conf.lifc_family = AF_UNSPEC;
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#endif
	ifaces->conf.lifc_len = ifaces->num * sizeof(struct LIFREQ);
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	ifaces->conf.lifc_buf = dmalloc(ifaces->conf.lifc_len, MDL);
	if (ifaces->conf.lifc_buf == NULL) {
		log_fatal("Out of memory getting interface list.");
	}

	if (ioctl(ifaces->sock, SIOCGLIFCONF, &ifaces->conf) < 0) {
		log_error("Error getting interfaces configuration list; %m");
		dfree(ifaces->conf.lifc_buf, MDL);
		close(ifaces->sock);
		ifaces->sock = -1;
		return 0;
	}

	ifaces->next = 0;

	return 1;
}

/*
 * Retrieve the next interface.
 *
 * Returns information in the info structure. 
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 * Sets err to 1 if there is an error, otherwise 0.
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 */
int
next_iface(struct iface_info *info, int *err, struct iface_conf_list *ifaces) {
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	struct LIFREQ *p;
	struct LIFREQ tmp;
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	isc_boolean_t foundif;
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#if defined(sun) || defined(__linux)
	/* Pointer used to remove interface aliases. */
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	char *s;
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#endif
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	do {
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		foundif = ISC_FALSE;

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		if (ifaces->next >= ifaces->num) {
			*err = 0;
			return 0;
		}
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		p = ifaces->conf.lifc_req;
		p += ifaces->next;
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		if (strlen(p->lifr_name) >= sizeof(info->name)) {
			*err = 1;
			log_error("Interface name '%s' too long", p->lifr_name);
			return 0;
		}
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		/* Reject if interface address family does not match */
		if (p->lifr_addr.ss_family != local_family) {
			ifaces->next++;
			continue;
		}

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		memset(info, 0, sizeof(struct iface_info));
		strncpy(info->name, p->lifr_name, sizeof(info->name) - 1);
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		memcpy(&info->addr, &p->lifr_addr, sizeof(p->lifr_addr));
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#if defined(sun) || defined(__linux)
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		/* interface aliases look like "eth0:1" or "wlan1:3" */
		s = strchr(info->name, ':');
		if (s != NULL) {
			*s = '\0';
		}
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#endif /* defined(sun) || defined(__linux) */
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		foundif = ISC_TRUE;
	} while ((foundif == ISC_FALSE) ||
		 (strncmp(info->name, "dummy", 5) == 0));
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	memset(&tmp, 0, sizeof(tmp));
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	strncpy(tmp.lifr_name, info->name, sizeof(tmp.lifr_name) - 1);
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	if (ioctl(ifaces->sock, SIOCGLIFFLAGS, &tmp) < 0) {
		log_error("Error getting interface flags for '%s'; %m", 
			  p->lifr_name);
		*err = 1;
		return 0;
	}
	info->flags = tmp.lifr_flags;

	ifaces->next++;
	*err = 0;
	return 1;
}

/*
 * End scan of interfaces.
 */
void
end_iface_scan(struct iface_conf_list *ifaces) {
	dfree(ifaces->conf.lifc_buf, MDL);
	close(ifaces->sock);
	ifaces->sock = -1;
}

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#else
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/* 
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 * BSD/Linux support
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 * -----------
 *
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 * FreeBSD, NetBSD, OpenBSD, OS X/macOS and Linux all have the getifaddrs() 
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 * function.
 *
 * The getifaddrs() man page describes the use.
 */

#include <ifaddrs.h>

/* 
 * Structure holding state about the scan.
 */
struct iface_conf_list {
	struct ifaddrs *head;	/* beginning of the list */
	struct ifaddrs *next;	/* current position in the list */
};

/* 
 * Structure used to return information about a specific interface.
 */
struct iface_info {
	char name[IFNAMSIZ];		/* name of the interface, e.g. "bge0" */
	struct sockaddr_storage addr;	/* address information */
	isc_uint64_t flags;		/* interface flags, e.g. IFF_LOOPBACK */
};

/* 
 * Start a scan of interfaces.
 *
 * The iface_conf_list structure maintains state for this process.
 */
int 
begin_iface_scan(struct iface_conf_list *ifaces) {
	if (getifaddrs(&ifaces->head) != 0) {
		log_error("Error getting interfaces; %m");
		return 0;
	}
	ifaces->next = ifaces->head;
	return 1;
}

/*
 * Retrieve the next interface.
 *
 * Returns information in the info structure. 
 * Sets err to 1 if there is an error, otherwise 0.
 */
int
next_iface(struct iface_info *info, int *err, struct iface_conf_list *ifaces) {
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	size_t sa_len = 0;

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	if (ifaces->next == NULL) {
		*err = 0;
		return 0;
	}
	if (strlen(ifaces->next->ifa_name) >= sizeof(info->name)) {
		log_error("Interface name '%s' too long", 
			  ifaces->next->ifa_name);
		*err = 1;
		return 0;
	}
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	memset(info, 0, sizeof(struct iface_info));
	strncpy(info->name, ifaces->next->ifa_name, sizeof(info->name) - 1);
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	memset(&info->addr, 0 , sizeof(info->addr));
	/*
	 * getifaddrs() can on Linux with some interfaces like PPP or TEQL
	 * result in a record with no address (ifa_addr).
	 */
	if (ifaces->next->ifa_addr != NULL) {
/* Linux lacks the sa_len member in struct sockaddr. */
#if defined(__linux)
		if (ifaces->next->ifa_addr->sa_family == AF_INET)
			sa_len = sizeof(struct sockaddr_in);
		else if (ifaces->next->ifa_addr->sa_family == AF_INET6)
			sa_len = sizeof(struct sockaddr_in6);
#else
		sa_len = ifaces->next->ifa_addr->sa_len;
#endif
		memcpy(&info->addr, ifaces->next->ifa_addr, sa_len);
	}
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	info->flags = ifaces->next->ifa_flags;
	ifaces->next = ifaces->next->ifa_next;
	*err = 0;
	return 1;
}

/*
 * End scan of interfaces.
 */
void
end_iface_scan(struct iface_conf_list *ifaces) {
	freeifaddrs(ifaces->head);
	ifaces->head = NULL;
	ifaces->next = NULL;
}
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#endif 

/* XXX: perhaps create drealloc() rather than do it manually */
void
add_ipv4_addr_to_interface(struct interface_info *iface, 
			   const struct in_addr *addr) {
	/*
	 * We don't expect a lot of addresses per IPv4 interface, so
	 * we use 4, as our "chunk size" for collecting addresses.
	 */
	if (iface->addresses == NULL) {
		iface->addresses = dmalloc(4 * sizeof(struct in_addr), MDL);
		if (iface->addresses == NULL) {
			log_fatal("Out of memory saving IPv4 address "
			          "on interface.");
		}
		iface->address_count = 0;
		iface->address_max = 4;
	} else if (iface->address_count >= iface->address_max) {
		struct in_addr *tmp;
		int new_max;

		new_max = iface->address_max + 4;
		tmp = dmalloc(new_max * sizeof(struct in_addr), MDL);
		if (tmp == NULL) {
			log_fatal("Out of memory saving IPv4 address "
			          "on interface.");
		}
		memcpy(tmp, 
		       iface->addresses, 
		       iface->address_max * sizeof(struct in_addr));
		dfree(iface->addresses, MDL);
		iface->addresses = tmp;
		iface->address_max = new_max;
	}
	iface->addresses[iface->address_count++] = *addr;
}

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#ifdef DHCPv6
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/* XXX: perhaps create drealloc() rather than do it manually */
void
add_ipv6_addr_to_interface(struct interface_info *iface, 
			   const struct in6_addr *addr) {
	/*
	 * Each IPv6 interface will have at least two IPv6 addresses,
	 * and likely quite a few more. So we use 8, as our "chunk size" for
	 * collecting addresses.
	 */
	if (iface->v6addresses == NULL) {
		iface->v6addresses = dmalloc(8 * sizeof(struct in6_addr), MDL);
		if (iface->v6addresses == NULL) {
			log_fatal("Out of memory saving IPv6 address "
				  "on interface.");
		}
		iface->v6address_count = 0;
		iface->v6address_max = 8;
	} else if (iface->v6address_count >= iface->v6address_max) {
		struct in6_addr *tmp;
		int new_max;

		new_max = iface->v6address_max + 8;
		tmp = dmalloc(new_max * sizeof(struct in6_addr), MDL);
		if (tmp == NULL) {
			log_fatal("Out of memory saving IPv6 address "
				  "on interface.");
		}
		memcpy(tmp, 
		       iface->v6addresses, 
		       iface->v6address_max * sizeof(struct in6_addr));
		dfree(iface->v6addresses, MDL);
		iface->v6addresses = tmp;
		iface->v6address_max = new_max;
	}
	iface->v6addresses[iface->v6address_count++] = *addr;
}
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#endif /* DHCPv6 */
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/* Use the SIOCGIFCONF ioctl to get a list of all the attached interfaces.
   For each interface that's of type INET and not the loopback interface,
   register that interface with the network I/O software, figure out what
   subnet it's on, and add it to the list of interfaces. */

void 
discover_interfaces(int state) {
	struct iface_conf_list ifaces;
	struct iface_info info;
	int err;

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	struct interface_info *tmp;
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	struct interface_info *last, *next;

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#ifdef DHCPv6
        char abuf[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
#endif /* DHCPv6 */

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	struct subnet *subnet;
	int ir;
	isc_result_t status;
	int wifcount = 0;
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#ifdef RELAY_PORT
	int updone = 0;
	int downdone = 0;
#endif
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	static int setup_fallback = 0;

	if (!begin_iface_scan(&ifaces)) {
		log_fatal("Can't get list of interfaces.");
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	}
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	/* If we already have a list of interfaces, and we're running as
	   a DHCP server, the interfaces were requested. */
	if (interfaces && (state == DISCOVER_SERVER ||
			   state == DISCOVER_RELAY ||
			   state == DISCOVER_REQUESTED))
		ir = 0;
	else if (state == DISCOVER_UNCONFIGURED)
		ir = INTERFACE_REQUESTED | INTERFACE_AUTOMATIC;
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	else {
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		ir = INTERFACE_REQUESTED;
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		if (state == DISCOVER_RELAY && local_family == AF_INET) {
			/* We're a v4 relay without specifically requested
			 * interfaces, so mark them all as bidirectional. */
			ir |= INTERFACE_STREAMS;
		}
	}
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	/* Cycle through the list of interfaces looking for IP addresses. */
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	while (next_iface(&info, &err, &ifaces)) {
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		/* See if we've seen an interface that matches this one. */
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		for (tmp = interfaces; tmp; tmp = tmp->next) {
			if (!strcmp(tmp->name, info.name))
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				break;
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		}
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		/* Skip non broadcast interfaces (plus loopback and
		   point-to-point in case an OS incorrectly marks them
		   as broadcast). Also skip down interfaces unless we're
		   trying to get a list of configurable interfaces. */
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		if ((((local_family == AF_INET &&
		    !(info.flags & IFF_BROADCAST)) ||
#ifdef DHCPv6
		    (local_family == AF_INET6 &&
		    !(info.flags & IFF_MULTICAST)) ||
#endif
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		      info.flags & IFF_LOOPBACK ||
		      info.flags & IFF_POINTOPOINT) && !tmp) ||
		    (!(info.flags & IFF_UP) &&
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		     state != DISCOVER_UNCONFIGURED))
			continue;
		
		/* If there isn't already an interface by this name,
		   allocate one. */
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		if (tmp == NULL) {
			status = interface_allocate(&tmp, MDL);
			if (status != ISC_R_SUCCESS) {
				log_fatal("Error allocating interface %s: %s",
					  info.name, isc_result_totext(status));
			}
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			strncpy(tmp->name, info.name, sizeof(tmp->name) - 1);
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			interface_snorf(tmp, ir);
			interface_dereference(&tmp, MDL);
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			tmp = interfaces; /* XXX */
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		}

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		if (dhcp_interface_discovery_hook) {
			(*dhcp_interface_discovery_hook)(tmp);
		}
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		if ((info.addr.ss_family == AF_INET) && 
		    (local_family == AF_INET)) {
			struct sockaddr_in *a = (struct sockaddr_in*)&info.addr;
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			struct iaddr addr;

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			/* We don't want the loopback interface. */
			if (a->sin_addr.s_addr == htonl(INADDR_LOOPBACK) &&
			    ((tmp->flags & INTERFACE_AUTOMATIC) &&
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			     ((state == DISCOVER_SERVER) ||
			      (state == DISCOVER_SERVER46))))
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				continue;

			/* If the only address we have is 0.0.0.0, we
			   shouldn't consider the interface configured. */
			if (a->sin_addr.s_addr != htonl(INADDR_ANY))
				tmp->configured = 1;

			add_ipv4_addr_to_interface(tmp, &a->sin_addr);

			/* invoke the setup hook */
			addr.len = 4;
			memcpy(addr.iabuf, &a->sin_addr.s_addr, addr.len);
			if (dhcp_interface_setup_hook) {
				(*dhcp_interface_setup_hook)(tmp, &addr);
			}
		}
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#ifdef DHCPv6
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		else if ((info.addr.ss_family == AF_INET6) && 
			 (local_family == AF_INET6)) {
			struct sockaddr_in6 *a = 
					(struct sockaddr_in6*)&info.addr;
			struct iaddr addr;
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			/* We don't want the loopback interface. */
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			if (IN6_IS_ADDR_LOOPBACK(&a->sin6_addr) && 
			    ((tmp->flags & INTERFACE_AUTOMATIC) &&
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			     ((state == DISCOVER_SERVER) ||
			      (state == DISCOVER_SERVER46))))
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			    continue;
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			/* If the only address we have is 0.0.0.0, we
			   shouldn't consider the interface configured. */
			if (IN6_IS_ADDR_UNSPECIFIED(&a->sin6_addr))
				tmp->configured = 1;
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			add_ipv6_addr_to_interface(tmp, &a->sin6_addr);

			/* invoke the setup hook */
			addr.len = 16;
			memcpy(addr.iabuf, &a->sin6_addr, addr.len);
			if (dhcp_interface_setup_hook) {
				(*dhcp_interface_setup_hook)(tmp, &addr);
			}
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		}
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#endif /* DHCPv6 */
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	}

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	if (err) {
		log_fatal("Error getting interface information.");
	}

	end_iface_scan(&ifaces);
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	/* Mock-up an 'ifp' structure which is no longer used in the
	 * new interface-sensing code, but is used in higher layers
	 * (for example to sense fallback interfaces).
	 */
	for (tmp = interfaces ; tmp != NULL ; tmp = tmp->next) {
		if (tmp->ifp == NULL) {
			struct ifreq *tif;

			tif = (struct ifreq *)dmalloc(sizeof(struct ifreq),
						      MDL);
			if (tif == NULL)
				log_fatal("no space for ifp mockup.");
			strcpy(tif->ifr_name, tmp->name);
			tmp->ifp = tif;
		}
	}


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	/* If we're just trying to get a list of interfaces that we might
	   be able to configure, we can quit now. */
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	if (state == DISCOVER_UNCONFIGURED) {
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		return;
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	}
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	/* Weed out the interfaces that did not have IP addresses. */
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	tmp = last = next = NULL;
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	if (interfaces)
		interface_reference (&tmp, interfaces, MDL);
	while (tmp) {
		if (next)
			interface_dereference (&next, MDL);
		if (tmp -> next)
			interface_reference (&next, tmp -> next, MDL);
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		/* skip interfaces that are running already */
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		if (tmp -> flags & INTERFACE_RUNNING) {
			interface_dereference(&tmp, MDL);
			if(next)
				interface_reference(&tmp, next, MDL);
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			continue;
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		}
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		if ((tmp -> flags & INTERFACE_AUTOMATIC) &&
		    state == DISCOVER_REQUESTED)
			tmp -> flags &= ~(INTERFACE_AUTOMATIC |
					  INTERFACE_REQUESTED);
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#ifdef DHCPv6
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		if (!(tmp->flags & INTERFACE_REQUESTED)) {
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#else
		if (!tmp -> ifp || !(tmp -> flags & INTERFACE_REQUESTED)) {
#endif /* DHCPv6 */
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			if ((tmp -> flags & INTERFACE_REQUESTED) != ir)
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				log_fatal ("%s: not found", tmp -> name);
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			if (!last) {
				if (interfaces)
					interface_dereference (&interfaces,
							       MDL);
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				if (next)
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				interface_reference (&interfaces, next, MDL);
			} else {
				interface_dereference (&last -> next, MDL);
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				if (next)
					interface_reference (&last -> next,
							     next, MDL);
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			}
			if (tmp -> next)
				interface_dereference (&tmp -> next, MDL);
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			/* Remember the interface in case we need to know
			   about it later. */
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			if (dummy_interfaces) {
				interface_reference (&tmp -> next,
						     dummy_interfaces, MDL);
				interface_dereference (&dummy_interfaces, MDL);
			}
			interface_reference (&dummy_interfaces, tmp, MDL);
			interface_dereference (&tmp, MDL);
			if (next)
				interface_reference (&tmp, next, MDL);
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			continue;
		}
		last = tmp;

		/* We must have a subnet declaration for each interface. */
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		if (!tmp->shared_network && (state == DISCOVER_SERVER)) {
			log_error("%s", "");
			if (local_family == AF_INET) {
				log_error("No subnet declaration for %s (%s).",
					  tmp->name, 
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					  (tmp->addresses == NULL) ?
					   "no IPv4 addresses" :
					   inet_ntoa(tmp->addresses[0]));
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#ifdef DHCPv6
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			} else {
				if (tmp->v6addresses != NULL) {
					inet_ntop(AF_INET6, 
						  &tmp->v6addresses[0],
						  abuf,
						  sizeof(abuf));
				} else {
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					strcpy(abuf, "no IPv6 addresses");
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				}
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				log_error("No subnet6 declaration for %s (%s).",
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					  tmp->name,
					  abuf);
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#endif /* DHCPv6 */
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			}
			if (supports_multiple_interfaces(tmp)) {
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				log_error ("** Ignoring requests on %s.  %s",
					   tmp -> name, "If this is not what");
				log_error ("   you want, please write %s",
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#ifdef DHCPv6
				           (local_family != AF_INET) ?
					   "a subnet6 declaration" :
#endif
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					   "a subnet declaration");
				log_error ("   in your dhcpd.conf file %s",
					   "for the network segment");
				log_error ("   to %s %s %s",
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					   "which interface",
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					   tmp -> name, "is attached. **");
				log_error ("%s", "");
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				goto next;
			} else {
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				log_error ("You must write a %s",
#ifdef DHCPv6
				           (local_family != AF_INET) ?
					   "subnet6 declaration for this" :
#endif
					   "subnet declaration for this");
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				log_error ("subnet.   You cannot prevent %s",
					   "the DHCP server");
				log_error ("from listening on this subnet %s",
					   "because your");
				log_fatal ("operating system does not %s.",
					   "support this capability");
			}
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		}
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		/* Find subnets that don't have valid interface
		   addresses... */
		for (subnet = (tmp -> shared_network
			       ? tmp -> shared_network -> subnets
			       : (struct subnet *)0);
		     subnet; subnet = subnet -> next_sibling) {
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			/* Set the interface address for this subnet
			   to the first address we found. */
		     	if (subnet->interface_address.len == 0) {
				if (tmp->address_count > 0) {
					subnet->interface_address.len = 4;
					memcpy(subnet->interface_address.iabuf,
					       &tmp->addresses[0].s_addr, 4);
				} else if (tmp->v6address_count > 0) {
					subnet->interface_address.len = 16;
					memcpy(subnet->interface_address.iabuf,
					       &tmp->v6addresses[0].s6_addr, 
					       16);
				} else {
					/* XXX: should be one */
					log_error("%s missing an interface "
						  "address", tmp->name);
					continue;
				}
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			}
		}

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		/* Flag the index as not having been set, so that the
		   interface registerer can set it or not as it chooses. */
		tmp -> index = -1;

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		/* Register the interface... */
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		switch (local_family) {
		case AF_INET:
			if (!dhcpv4_over_dhcpv6) {
				if_register_receive(tmp);
				if_register_send(tmp);
			} else {
				/* get_hw_addr() was called by register. */
				get_hw_addr(tmp->name, &tmp->hw_address);
			}
			break;
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#ifdef DHCPv6
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		case AF_INET6:
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			if ((state == DISCOVER_SERVER) ||
			    (state == DISCOVER_RELAY)) {
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				if_register6(tmp, 1);
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			} else if (state == DISCOVER_SERVER46) {
				/* get_hw_addr() was called by if_register*6
				   so now we have to call it explicitly
				   to not leave the hardware address unknown
				   (some code expects it cannot be. */
				get_hw_addr(tmp->name, &tmp->hw_address);
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			} else {
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				if_register_linklocal6(tmp);
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			}
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			break;
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#endif /* DHCPv6 */
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		}
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		interface_stash (tmp);
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		wifcount++;
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#if defined (F_SETFD)
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		/* if_register*() are no longer always called so
		   descriptors  must be checked. */
		if ((tmp -> rfdesc >= 0) &&
		    (fcntl (tmp -> rfdesc, F_SETFD, 1) < 0))
			log_error ("Can't set close-on-exec on %s: %m",
				   tmp -> name);
		if ((tmp -> wfdesc != tmp -> rfdesc) &&
		    (tmp -> wfdesc >= 0) &&
		    (fcntl (tmp -> wfdesc, F_SETFD, 1) < 0))
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			log_error ("Can't set close-on-exec on %s: %m",
				   tmp -> name);
#endif
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	      next:
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		interface_dereference (&tmp, MDL);
		if (next)
			interface_reference (&tmp, next, MDL);
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	}

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	/*
	 * Now register all the remaining interfaces as protocols.
	 * We register with omapi to allow for control of the interface,
	 * we've already registered the fd or socket with the socket
	 * manager as part of if_register_receive().
	 */
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	for (tmp = interfaces; tmp; tmp = tmp -> next) {
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		/* not if it's been registered before */
		if (tmp -> flags & INTERFACE_RUNNING)
			continue;
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		if (tmp -> rfdesc == -1)
			continue;
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		switch (local_family) {
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#ifdef DHCPv6 
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		case AF_INET6:
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#ifdef RELAY_PORT
#define UPSTREAM(ifp) \
	((ifp->flags & INTERFACE_STREAMS) == INTERFACE_UPSTREAM)
#define DOWNSTREAM(ifp) \
        ((ifp->flags & INTERFACE_STREAMS) == INTERFACE_DOWNSTREAM)

			if (relay_port) {
				/*
				 * The normal IPv6 relay only needs one
				 * socket as long as we find an interface.
				 * When user relay port is defined, and we
				 * have two different UDP ports. One to
				 * receive from DHCP client with port 547,
				 * and the other is user defined for sending
				 * to the server or upstream relay agent.
				 * Thus we need to register sockets for one
				 * upstream and one downstream interfaces.
				 */
				if (updone && UPSTREAM(tmp))
					    continue;
				if (downdone && DOWNSTREAM(tmp))
					    continue;
			}
#endif
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			status = omapi_register_io_object((omapi_object_t *)tmp,
							  if_readsocket, 
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							  0, got_one_v6, 0, 0);
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#ifdef RELAY_PORT
			if (UPSTREAM(tmp))
				updone++;
			else
				downdone++;
#endif
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			break;
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#endif /* DHCPv6 */
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		case AF_INET:
		default:
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			status = omapi_register_io_object((omapi_object_t *)tmp,
							  if_readsocket, 
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							  0, got_one, 0, 0);
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			break;
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		}
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		if (status != ISC_R_SUCCESS)
			log_fatal ("Can't register I/O handle for %s: %s",
				   tmp -> name, isc_result_totext (status));
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#if defined(DHCPv6)
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		/* Only register the first interface for V6, since
		 * servers and relays all use the same socket.
		 * XXX: This has some messy side effects if we start
		 * dynamically adding and removing interfaces, but
		 * we're well beyond that point in terms of mess.
1007
		 */
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		if (((state == DISCOVER_SERVER) || (state == DISCOVER_RELAY))
		    && (local_family == AF_INET6)
#if defined(RELAY_PORT)
		    && ((relay_port == 0) || (updone && downdone))
#endif
		    )
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			break;
#endif
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	} /* for (tmp = interfaces; ... */
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	if (state == DISCOVER_SERVER && wifcount == 0) {
		log_info ("%s", "");
		log_fatal ("Not configured to listen on any interfaces!");
	}

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	if ((local_family == AF_INET) &&
	    !setup_fallback && !dhcpv4_over_dhcpv6) {
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		setup_fallback = 1;
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		maybe_setup_fallback();
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	}

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#if defined (F_SETFD)
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	if (fallback_interface) {
	    if (fcntl (fallback_interface -> rfdesc, F_SETFD, 1) < 0)
		log_error ("Can't set close-on-exec on fallback: %m");
	    if (fallback_interface -> rfdesc != fallback_interface -> wfdesc) {
		if (fcntl (fallback_interface -> wfdesc, F_SETFD, 1) < 0)
		    log_error ("Can't set close-on-exec on fallback: %m");
	    }
	}
1038
#endif /* F_SETFD */
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}

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int if_readsocket (h)
	omapi_object_t *h;
{
	struct interface_info *ip;

	if (h -> type != dhcp_type_interface)
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		return -1;
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	ip = (struct interface_info *)h;
	return ip -> rfdesc;
}

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int setup_fallback (struct interface_info **fp, const char *file, int line)
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{
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	isc_result_t status;

	status = interface_allocate (&fallback_interface, file, line);
	if (status != ISC_R_SUCCESS)
		log_fatal ("Error allocating fallback interface: %s",
			   isc_result_totext (status));
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	strcpy (fallback_interface -> name, "fallback");
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	if (dhcp_interface_setup_hook)
		(*dhcp_interface_setup_hook) (fallback_interface,
					      (struct iaddr *)0);
	status = interface_reference (fp, fallback_interface, file, line);
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	fallback_interface -> index = -1;
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	interface_stash (fallback_interface);
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	return status == ISC_R_SUCCESS;
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}

void reinitialize_interfaces ()
{
	struct interface_info *ip;

	for (ip = interfaces; ip; ip = ip -> next) {
		if_reinitialize_receive (ip);
		if_reinitialize_send (ip);
	}

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	if (fallback_interface)
		if_reinitialize_send (fallback_interface);
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	interfaces_invalidated = 1;
}
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isc_result_t got_one (h)
	omapi_object_t *h;
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{
	struct sockaddr_in from;
	struct hardware hfrom;
	struct iaddr ifrom;
	int result;
	union {
		unsigned char packbuf [4095]; /* Packet input buffer.
					 	 Must be as large as largest
						 possible MTU. */
		struct dhcp_packet packet;
	} u;
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	struct interface_info *ip;

	if (h -> type != dhcp_type_interface)
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		return DHCP_R_INVALIDARG;
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	ip = (struct interface_info *)h;
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1105
      again:
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	if ((result =
	     receive_packet (ip, u.packbuf, sizeof u, &from, &hfrom)) < 0) {
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		log_error ("receive_packet failed on %s: %m", ip -> name);
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		return ISC_R_UNEXPECTED;
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	}
	if (result == 0)
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		return ISC_R_UNEXPECTED;
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	/*
	 * If we didn't at least get the fixed portion of the BOOTP
	 * packet, drop the packet.
	 * Previously we allowed packets with no sname or filename
	 * as we were aware of at least one client that did.  But
	 * a bug caused short packets to not work and nobody has
	 * complained, it seems rational to tighten up that
	 * restriction.
	 */
	if (result < DHCP_FIXED_NON_UDP)
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		return ISC_R_UNEXPECTED;