Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/isakmpd/udp.c	Lines:	0	202	0.0 %
Date:	2016-12-06	Branches:	0	123	0.0 %


/* $OpenBSD: udp.c,v 1.95 2008/07/22 09:45:56 bluhm Exp $	 */
/* $EOM: udp.c,v 1.57 2001/01/26 10:09:57 niklas Exp $	 */

/*
 * Copyright (c) 1998, 1999, 2001 Niklas Hallqvist.  All rights reserved.
 * Copyright (c) 2000 Angelos D. Keromytis.  All rights reserved.
 * Copyright (c) 2003, 2004 H�kan Olsson.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <limits.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "conf.h"
#include "if.h"
#include "isakmp.h"
#include "log.h"
#include "message.h"
#include "monitor.h"
#include "transport.h"
#include "udp.h"
#include "util.h"
#include "virtual.h"

#define UDP_SIZE 65536

/* If a system doesn't have SO_REUSEPORT, SO_REUSEADDR will have to do. */
#ifndef SO_REUSEPORT
#define SO_REUSEPORT SO_REUSEADDR
#endif

/* These are reused by udp_encap.c, thus not 'static' here.  */
struct transport *udp_clone(struct transport *, struct sockaddr *);
int		  udp_fd_set(struct transport *, fd_set *, int);
int		  udp_fd_isset(struct transport *, fd_set *);
void		  udp_get_dst(struct transport *, struct sockaddr **);
void		  udp_get_src(struct transport *, struct sockaddr **);
char		 *udp_decode_ids(struct transport *);
void		  udp_remove(struct transport *);

static struct transport *udp_create(char *);
static void     udp_report(struct transport *);
static void     udp_handle_message(struct transport *);
static struct transport *udp_make(struct sockaddr *);
static int      udp_send_message(struct message *, struct transport *);

static struct transport_vtbl udp_transport_vtbl = {
	{0}, "udp_physical",
	udp_create,
	0,
	udp_remove,
	udp_report,
	udp_fd_set,
	udp_fd_isset,
	udp_handle_message,
	udp_send_message,
	udp_get_dst,
	udp_get_src,
	udp_decode_ids,
	udp_clone,
	0
};

char		*udp_default_port = 0;
int		 bind_family = 0;

void
udp_init(void)
{
	transport_method_add(&udp_transport_vtbl);
}

/* Create a UDP transport structure bound to LADDR just for listening.  */
static struct transport *
udp_make(struct sockaddr *laddr)
{
	struct udp_transport *t = 0;
	int	s, on, wildcardaddress = 0;
	char	*tstr;

	t = calloc(1, sizeof *t);
	if (!t) {
		log_print("udp_make: calloc (1, %lu) failed",
		    (unsigned long)sizeof *t);
		free(laddr);
		return 0;
	}
	t->src = laddr;

	s = socket(laddr->sa_family, SOCK_DGRAM, IPPROTO_UDP);
	if (s == -1) {
		log_error("udp_make: socket (%d, %d, %d)", laddr->sa_family,
		    SOCK_DGRAM, IPPROTO_UDP);
		goto err;
	}
	/* Make sure we don't get our traffic encrypted.  */
	if (sysdep_cleartext(s, laddr->sa_family) == -1)
		goto err;

	/* Wildcard address ?  */
	switch (laddr->sa_family) {
	case AF_INET:
		if (((struct sockaddr_in *)laddr)->sin_addr.s_addr ==
		    INADDR_ANY)
			wildcardaddress = 1;
		break;
	case AF_INET6:
		if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)laddr)->sin6_addr))
			wildcardaddress = 1;
		break;
	}

	/*
	 * In order to have several bound specific address-port combinations
	 * with the same port SO_REUSEADDR is needed.  If this is a wildcard
	 * socket and we are not listening there, but only sending from it
	 * make sure it is entirely reuseable with SO_REUSEPORT.
	 */
	on = 1;
	if (setsockopt(s, SOL_SOCKET,
	    wildcardaddress ? SO_REUSEPORT : SO_REUSEADDR,
	    (void *)&on, sizeof on) == -1) {
		log_error("udp_make: setsockopt (%d, %d, %d, %p, %lu)", s,
		    SOL_SOCKET, wildcardaddress ? SO_REUSEPORT : SO_REUSEADDR,
		    &on, (unsigned long)sizeof on);
		goto err;
	}
	t->transport.vtbl = &udp_transport_vtbl;
	if (monitor_bind(s, t->src, SA_LEN(t->src))) {
		if (sockaddr2text(t->src, &tstr, 0))
			log_error("udp_make: bind (%d, %p, %lu)", s, &t->src,
			    (unsigned long)sizeof t->src);
		else {
			log_error("udp_make: bind (%d, %s, %lu)", s, tstr,
			    (unsigned long)sizeof t->src);
			free(tstr);
		}
		goto err;
	}
	t->s = s;
	if (sockaddr2text(t->src, &tstr, 0))
		LOG_DBG((LOG_MISC, 20, "udp_make: "
		    "transport %p socket %d family %d", t, s,
		    t->src->sa_family == AF_INET ? 4 : 6));
	else {
		LOG_DBG((LOG_MISC, 20, "udp_make: "
		    "transport %p socket %d ip %s port %d", t, s,
		    tstr, ntohs(sockaddr_port(t->src))));
		free (tstr);
	}
	transport_setup(&t->transport, 0);
	t->transport.flags |= TRANSPORT_LISTEN;
	return &t->transport;

err:
	if (s >= 0)
		close(s);
	if (t) {
		/* Already closed.  */
		t->s = -1;
		udp_remove(&t->transport);
	}
	return 0;
}

/* Clone a listen transport U, record a destination RADDR for outbound use.  */
struct transport *
udp_clone(struct transport *ut, struct sockaddr *raddr)
{
	struct udp_transport *u = (struct udp_transport *)ut;
	struct udp_transport *u2;
	struct transport *t;

	t = malloc(sizeof *u);
	if (!t) {
		log_error("udp_clone: malloc (%lu) failed",
		    (unsigned long)sizeof *u);
		return 0;
	}
	u2 = (struct udp_transport *)t;

	memcpy(u2, u, sizeof *u);

	u2->src = malloc(SA_LEN(u->src));
	if (!u2->src) {
		log_error("udp_clone: malloc (%lu) failed",
		    (unsigned long)SA_LEN(u->src));
		free(t);
		return 0;
	}
	memcpy(u2->src, u->src, SA_LEN(u->src));

	u2->dst = malloc(SA_LEN(raddr));
	if (!u2->dst) {
		log_error("udp_clone: malloc (%lu) failed",
		    (unsigned long)SA_LEN(raddr));
		free(u2->src);
		free(t);
		return 0;
	}
	memcpy(u2->dst, raddr, SA_LEN(raddr));

	t->flags &= ~TRANSPORT_LISTEN;
	transport_setup(t, 0);
	return t;
}

/*
 * Initialize an object of the UDP transport class.  Fill in the local
 * IP address and port information and create a server socket bound to
 * that specific port.  Add the polymorphic transport structure to the
 * system-wide pools of known ISAKMP transports.
 */
struct transport *
udp_bind(const struct sockaddr *addr)
{
	struct sockaddr *src;

	src = malloc(SA_LEN(addr));
	if (!src)
		return 0;

	memcpy(src, addr, SA_LEN(addr));
	return udp_make(src);
}

/*
 * NAME is a section name found in the config database.  Setup and return
 * a transport useable to talk to the peer specified by that name.
 */
static struct transport *
udp_create(char *name)
{
	struct virtual_transport *v;
	struct udp_transport *u;
	struct transport *rv = 0;
	struct sockaddr	*dst, *addr;
	char	*addr_str, *port_str;
	struct conf_list *addr_list = 0;
	struct conf_list_node *addr_node;

	port_str = conf_get_str(name, "Port");
	if (!port_str)
		port_str = udp_default_port;
	if (!port_str)
		port_str = UDP_DEFAULT_PORT_STR;

	addr_str = conf_get_str(name, "Address");
	if (!addr_str) {
		log_print("udp_create: no address configured for \"%s\"",
		    name);
		return 0;
	}
	if (text2sockaddr(addr_str, port_str, &dst, 0, 0)) {
		log_print("udp_create: address \"%s\" not understood",
		    addr_str);
		return 0;
	}
	addr_str = conf_get_str(name, "Local-address");
	if (!addr_str)
		addr_list = conf_get_list("General", "Listen-on");
	if (!addr_str && !addr_list) {
		v = virtual_get_default(dst->sa_family);
		if (!v) {
			log_print("udp_create: no virtual default transport "
			    "for address family %d", dst->sa_family);
			goto ret;
		}
		u = (struct udp_transport *)v->main;
		if (!u) {
			log_print("udp_create: no udp default transport "
			    "for address family %d", dst->sa_family);
			goto ret;
		}
		rv = udp_clone((struct transport *)u, dst);
		if (rv)
			rv->vtbl = &udp_transport_vtbl;
		goto ret;
	}

	if (addr_list) {
		for (addr_node = TAILQ_FIRST(&addr_list->fields);
		    addr_node; addr_node = TAILQ_NEXT(addr_node, link))
			if (text2sockaddr(addr_node->field,
			    port_str, &addr, 0, 0) == 0) {
				v = virtual_listen_lookup(addr);
				free(addr);
				if (v) {
					addr_str = addr_node->field;
					break;
				}
			}
		if (!addr_str) {
			log_print("udp_create: no matching listener found");
			goto ret;
		}
	}
	if (text2sockaddr(addr_str, port_str, &addr, 0, 0)) {
		log_print("udp_create: address \"%s\" not understood",
		    addr_str);
		goto ret;
	}

	v = virtual_listen_lookup(addr);
	free(addr);
	if (!v) {
		log_print("udp_create: %s:%s must exist as a listener too",
		    addr_str, port_str);
		goto ret;
	}
	rv = udp_clone(v->main, dst);
	if (rv)
		rv->vtbl = &udp_transport_vtbl;

ret:
	if (addr_list)
		conf_free_list(addr_list);
	free(dst);
	return rv;
}

void
udp_remove(struct transport *t)
{
	struct udp_transport *u = (struct udp_transport *)t;
	struct transport *p;

	free(u->src);
	free(u->dst);
	if ((t->flags & TRANSPORT_LISTEN) && u->s >= 0)
		close(u->s);

	for (p = LIST_FIRST(&transport_list); p && p != t; p =
	    LIST_NEXT(p, link))
		;
	if (p == t)
		LIST_REMOVE(t, link);

	LOG_DBG((LOG_TRANSPORT, 90, "udp_remove: removed transport %p", t));
	free(t);
}

/* Report transport-method specifics of the T transport. */
void
udp_report(struct transport *t)
{
	struct udp_transport *u = (struct udp_transport *)t;
	char		*src = NULL, *dst = NULL;
	in_port_t	 sport, dport;

	if (sockaddr2text(u->src, &src, 0))
		return;
	sport = sockaddr_port(u->src);

	if (!u->dst || sockaddr2text(u->dst, &dst, 0))
		dst = 0;
	dport = dst ? sockaddr_port(u->dst) : 0;

	LOG_DBG((LOG_REPORT, 0, "udp_report: fd %d src %s:%u dst %s:%u", u->s,
	    src, ntohs(sport), dst ? dst : "<none>", ntohs(dport)));

	free(dst);
	free(src);
}

/*
 * A message has arrived on transport T's socket.  If T is single-ended,
 * clone it into a double-ended transport which we will use from now on.
 * Package the message as we want it and continue processing in the message
 * module.
 */
static void
udp_handle_message(struct transport *t)
{
	struct udp_transport *u = (struct udp_transport *)t;
	u_int8_t        buf[UDP_SIZE];
	struct sockaddr_storage from;
	u_int32_t       len = sizeof from;
	ssize_t         n;
	struct message *msg;

	n = recvfrom(u->s, buf, UDP_SIZE, 0, (struct sockaddr *)&from, &len);
	if (n == -1) {
		log_error("recvfrom (%d, %p, %d, %d, %p, %p)", u->s, buf,
		    UDP_SIZE, 0, &from, &len);
		return;
	}

	if (t->virtual == (struct transport *)virtual_get_default(AF_INET) ||
	    t->virtual == (struct transport *)virtual_get_default(AF_INET6)) {
		t->virtual->vtbl->reinit();

		/*
		 * As we don't know the actual destination address of the
		 * packet, we can't really deal with it. So, just ignore it
		 * and hope we catch the retransmission.
		 */
		return;
	}

	/*
	 * Make a specialized UDP transport structure out of the incoming
	 * transport and the address information we got from recvfrom(2).
	 */
	t = t->virtual->vtbl->clone(t->virtual, (struct sockaddr *)&from);
	if (!t)
		return;

	msg = message_alloc(t, buf, n);
	if (!msg) {
		log_error("failed to allocate message structure, dropping "
		    "packet received on transport %p", u);
		t->vtbl->remove(t);
		return;
	}
	message_recv(msg);
}

/* Physically send the message MSG over its associated transport.  */
static int
udp_send_message(struct message *msg, struct transport *t)
{
	struct udp_transport *u = (struct udp_transport *)t;
	ssize_t         n;
	struct msghdr   m;

	/*
	 * Sending on connected sockets requires that no destination address is
	 * given, or else EISCONN will occur.
	 */
	m.msg_name = (caddr_t) u->dst;
	m.msg_namelen = SA_LEN(u->dst);
	m.msg_iov = msg->iov;
	m.msg_iovlen = msg->iovlen;
	m.msg_control = 0;
	m.msg_controllen = 0;
	m.msg_flags = 0;
	n = sendmsg(u->s, &m, 0);
	if (n == -1) {
		/* XXX We should check whether the address has gone away */
		log_error("sendmsg (%d, %p, %d)", u->s, &m, 0);
		return -1;
	}
	return 0;
}

int
udp_fd_set(struct transport *t, fd_set *fds, int bit)
{
	struct udp_transport		*u = (struct udp_transport *)t;

	if (bit)
		FD_SET(u->s, fds);
	else
		FD_CLR(u->s, fds);

	return u->s + 1;
}

int
udp_fd_isset(struct transport *t, fd_set *fds)
{
	struct udp_transport		*u = (struct udp_transport *)t;

	return FD_ISSET(u->s, fds);
}

/*
 * Get transport T's peer address and stuff it into the sockaddr pointed
 * to by DST.
 */
void
udp_get_dst(struct transport *t, struct sockaddr **dst)
{
	*dst = ((struct udp_transport *)t)->dst;
}

/*
 * Get transport T's local address and stuff it into the sockaddr pointed
 * to by SRC.  Put its length into SRC_LEN.
 */
void
udp_get_src(struct transport *t, struct sockaddr **src)
{
	*src = ((struct udp_transport *)t)->src;
}

char *
udp_decode_ids(struct transport *t)
{
	struct sockaddr *src, *dst;
	static char     result[1024];
	char            idsrc[256], iddst[256];

	t->vtbl->get_src(t, &src);
	t->vtbl->get_dst(t, &dst);

	if (getnameinfo(src, SA_LEN(src), idsrc, sizeof idsrc, NULL, 0,
	    NI_NUMERICHOST) != 0) {
		log_print("udp_decode_ids: getnameinfo () failed for 'src'");
		strlcpy(idsrc, "<error>", 256);
	}
	if (getnameinfo(dst, SA_LEN(dst), iddst, sizeof iddst, NULL, 0,
	    NI_NUMERICHOST) != 0) {
		log_print("udp_decode_ids: getnameinfo () failed for 'dst'");
		strlcpy(iddst, "<error>", 256);
	}

	snprintf(result, sizeof result, "src: %s dst: %s", idsrc, iddst);
	return result;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: udp.c,v 1.95 2008/07/22 09:45:56 bluhm Exp $ */
2			/* $EOM: udp.c,v 1.57 2001/01/26 10:09:57 niklas Exp $ */
3
4			/*
5			* Copyright (c) 1998, 1999, 2001 Niklas Hallqvist. All rights reserved.
6			* Copyright (c) 2000 Angelos D. Keromytis. All rights reserved.
7			* Copyright (c) 2003, 2004 H�kan Olsson. All rights reserved.
8			*
9			* Redistribution and use in source and binary forms, with or without
10			* modification, are permitted provided that the following conditions
11			* are met:
12			* 1. Redistributions of source code must retain the above copyright
13			* notice, this list of conditions and the following disclaimer.
14			* 2. Redistributions in binary form must reproduce the above copyright
15			* notice, this list of conditions and the following disclaimer in the
16			* documentation and/or other materials provided with the distribution.
17			*
18			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28			*/
29
30			/*
31			* This code was written under funding by Ericsson Radio Systems.
32			*/
33
34			#include <sys/types.h>
35			#include <sys/ioctl.h>
36			#include <sys/socket.h>
37			#include <sys/sockio.h>
38			#include <net/if.h>
39			#include <netinet/in.h>
40			#include <arpa/inet.h>
41			#include <ctype.h>
42			#include <limits.h>
43			#include <netdb.h>
44			#include <stdlib.h>
45			#include <string.h>
46			#include <unistd.h>
47
48			#include "conf.h"
49			#include "if.h"
50			#include "isakmp.h"
51			#include "log.h"
52			#include "message.h"
53			#include "monitor.h"
54			#include "transport.h"
55			#include "udp.h"
56			#include "util.h"
57			#include "virtual.h"
58
59			#define UDP_SIZE 65536
60
61			/* If a system doesn't have SO_REUSEPORT, SO_REUSEADDR will have to do. */
62			#ifndef SO_REUSEPORT
63			#define SO_REUSEPORT SO_REUSEADDR
64			#endif
65
66			/* These are reused by udp_encap.c, thus not 'static' here. */
67			struct transport udp_clone(struct transport , struct sockaddr *);
68			int udp_fd_set(struct transport , fd_set , int);
69			int udp_fd_isset(struct transport , fd_set );
70			void udp_get_dst(struct transport , struct sockaddr *);
71			void udp_get_src(struct transport , struct sockaddr *);
72			char udp_decode_ids(struct transport );
73			void udp_remove(struct transport *);
74
75			static struct transport udp_create(char );
76			static void udp_report(struct transport *);
77			static void udp_handle_message(struct transport *);
78			static struct transport udp_make(struct sockaddr );
79			static int udp_send_message(struct message , struct transport );
80
81			static struct transport_vtbl udp_transport_vtbl = {
82			{0}, "udp_physical",
83			udp_create,
84			0,
85			udp_remove,
86			udp_report,
87			udp_fd_set,
88			udp_fd_isset,
89			udp_handle_message,
90			udp_send_message,
91			udp_get_dst,
92			udp_get_src,
93			udp_decode_ids,
94			udp_clone,
95			0
96			};
97
98			char *udp_default_port = 0;
99			int bind_family = 0;
100
101			void
102			udp_init(void)
103			{
104			transport_method_add(&udp_transport_vtbl);
105			}
106
107			/* Create a UDP transport structure bound to LADDR just for listening. */
108			static struct transport *
109			udp_make(struct sockaddr *laddr)
110			{
111			struct udp_transport *t = 0;
112			int s, on, wildcardaddress = 0;
113			char *tstr;
114
115			t = calloc(1, sizeof *t);
116			if (!t) {
117			log_print("udp_make: calloc (1, %lu) failed",
118			(unsigned long)sizeof *t);
119			free(laddr);
120			return 0;
121			}
122			t->src = laddr;
123
124			s = socket(laddr->sa_family, SOCK_DGRAM, IPPROTO_UDP);
125			if (s == -1) {
126			log_error("udp_make: socket (%d, %d, %d)", laddr->sa_family,
127			SOCK_DGRAM, IPPROTO_UDP);
128			goto err;
129			}
130			/* Make sure we don't get our traffic encrypted. */
131			if (sysdep_cleartext(s, laddr->sa_family) == -1)
132			goto err;
133
134			/* Wildcard address ? */
135			switch (laddr->sa_family) {
136			case AF_INET:
137			if (((struct sockaddr_in *)laddr)->sin_addr.s_addr ==
138			INADDR_ANY)
139			wildcardaddress = 1;
140			break;
141			case AF_INET6:
142			if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)laddr)->sin6_addr))
143			wildcardaddress = 1;
144			break;
145			}
146
147			/*
148			* In order to have several bound specific address-port combinations
149			* with the same port SO_REUSEADDR is needed. If this is a wildcard
150			* socket and we are not listening there, but only sending from it
151			* make sure it is entirely reuseable with SO_REUSEPORT.
152			*/
153			on = 1;
154			if (setsockopt(s, SOL_SOCKET,
155			wildcardaddress ? SO_REUSEPORT : SO_REUSEADDR,
156			(void *)&on, sizeof on) == -1) {
157			log_error("udp_make: setsockopt (%d, %d, %d, %p, %lu)", s,
158			SOL_SOCKET, wildcardaddress ? SO_REUSEPORT : SO_REUSEADDR,
159			&on, (unsigned long)sizeof on);
160			goto err;
161			}
162			t->transport.vtbl = &udp_transport_vtbl;
163			if (monitor_bind(s, t->src, SA_LEN(t->src))) {
164			if (sockaddr2text(t->src, &tstr, 0))
165			log_error("udp_make: bind (%d, %p, %lu)", s, &t->src,
166			(unsigned long)sizeof t->src);
167			else {
168			log_error("udp_make: bind (%d, %s, %lu)", s, tstr,
169			(unsigned long)sizeof t->src);
170			free(tstr);
171			}
172			goto err;
173			}
174			t->s = s;
175			if (sockaddr2text(t->src, &tstr, 0))
176			LOG_DBG((LOG_MISC, 20, "udp_make: "
177			"transport %p socket %d family %d", t, s,
178			t->src->sa_family == AF_INET ? 4 : 6));
179			else {
180			LOG_DBG((LOG_MISC, 20, "udp_make: "
181			"transport %p socket %d ip %s port %d", t, s,
182			tstr, ntohs(sockaddr_port(t->src))));
183			free (tstr);
184			}
185			transport_setup(&t->transport, 0);
186			t->transport.flags \|= TRANSPORT_LISTEN;
187			return &t->transport;
188
189			err:
190			if (s >= 0)
191			close(s);
192			if (t) {
193			/* Already closed. */
194			t->s = -1;
195			udp_remove(&t->transport);
196			}
197			return 0;
198			}
199
200			/* Clone a listen transport U, record a destination RADDR for outbound use. */
201			struct transport *
202			udp_clone(struct transport ut, struct sockaddr raddr)
203			{
204			struct udp_transport u = (struct udp_transport )ut;
205			struct udp_transport *u2;
206			struct transport *t;
207
208			t = malloc(sizeof *u);
209			if (!t) {
210			log_error("udp_clone: malloc (%lu) failed",
211			(unsigned long)sizeof *u);
212			return 0;
213			}
214			u2 = (struct udp_transport *)t;
215
216			memcpy(u2, u, sizeof *u);
217
218			u2->src = malloc(SA_LEN(u->src));
219			if (!u2->src) {
220			log_error("udp_clone: malloc (%lu) failed",
221			(unsigned long)SA_LEN(u->src));
222			free(t);
223			return 0;
224			}
225			memcpy(u2->src, u->src, SA_LEN(u->src));
226
227			u2->dst = malloc(SA_LEN(raddr));
228			if (!u2->dst) {
229			log_error("udp_clone: malloc (%lu) failed",
230			(unsigned long)SA_LEN(raddr));
231			free(u2->src);
232			free(t);
233			return 0;
234			}
235			memcpy(u2->dst, raddr, SA_LEN(raddr));
236
237			t->flags &= ~TRANSPORT_LISTEN;
238			transport_setup(t, 0);
239			return t;
240			}
241
242			/*
243			* Initialize an object of the UDP transport class. Fill in the local
244			* IP address and port information and create a server socket bound to
245			* that specific port. Add the polymorphic transport structure to the
246			* system-wide pools of known ISAKMP transports.
247			*/
248			struct transport *
249			udp_bind(const struct sockaddr *addr)
250			{
251			struct sockaddr *src;
252
253			src = malloc(SA_LEN(addr));
254			if (!src)
255			return 0;
256
257			memcpy(src, addr, SA_LEN(addr));
258			return udp_make(src);
259			}
260
261			/*
262			* NAME is a section name found in the config database. Setup and return
263			* a transport useable to talk to the peer specified by that name.
264			*/
265			static struct transport *
266			udp_create(char *name)
267			{
268			struct virtual_transport *v;
269			struct udp_transport *u;
270			struct transport *rv = 0;
271			struct sockaddr dst, addr;
272			char addr_str, port_str;
273			struct conf_list *addr_list = 0;
274			struct conf_list_node *addr_node;
275
276			port_str = conf_get_str(name, "Port");
277			if (!port_str)
278			port_str = udp_default_port;
279			if (!port_str)
280			port_str = UDP_DEFAULT_PORT_STR;
281
282			addr_str = conf_get_str(name, "Address");
283			if (!addr_str) {
284			log_print("udp_create: no address configured for \"%s\"",
285			name);
286			return 0;
287			}
288			if (text2sockaddr(addr_str, port_str, &dst, 0, 0)) {
289			log_print("udp_create: address \"%s\" not understood",
290			addr_str);
291			return 0;
292			}
293			addr_str = conf_get_str(name, "Local-address");
294			if (!addr_str)
295			addr_list = conf_get_list("General", "Listen-on");
296			if (!addr_str && !addr_list) {
297			v = virtual_get_default(dst->sa_family);
298			if (!v) {
299			log_print("udp_create: no virtual default transport "
300			"for address family %d", dst->sa_family);
301			goto ret;
302			}
303			u = (struct udp_transport *)v->main;
304			if (!u) {
305			log_print("udp_create: no udp default transport "
306			"for address family %d", dst->sa_family);
307			goto ret;
308			}
309			rv = udp_clone((struct transport *)u, dst);
310			if (rv)
311			rv->vtbl = &udp_transport_vtbl;
312			goto ret;
313			}
314
315			if (addr_list) {
316			for (addr_node = TAILQ_FIRST(&addr_list->fields);
317			addr_node; addr_node = TAILQ_NEXT(addr_node, link))
318			if (text2sockaddr(addr_node->field,
319			port_str, &addr, 0, 0) == 0) {
320			v = virtual_listen_lookup(addr);
321			free(addr);
322			if (v) {
323			addr_str = addr_node->field;
324			break;
325			}
326			}
327			if (!addr_str) {
328			log_print("udp_create: no matching listener found");
329			goto ret;
330			}
331			}
332			if (text2sockaddr(addr_str, port_str, &addr, 0, 0)) {
333			log_print("udp_create: address \"%s\" not understood",
334			addr_str);
335			goto ret;
336			}
337
338			v = virtual_listen_lookup(addr);
339			free(addr);
340			if (!v) {
341			log_print("udp_create: %s:%s must exist as a listener too",
342			addr_str, port_str);
343			goto ret;
344			}
345			rv = udp_clone(v->main, dst);
346			if (rv)
347			rv->vtbl = &udp_transport_vtbl;
348
349			ret:
350			if (addr_list)
351			conf_free_list(addr_list);
352			free(dst);
353			return rv;
354			}
355
356			void
357			udp_remove(struct transport *t)
358			{
359			struct udp_transport u = (struct udp_transport )t;
360			struct transport *p;
361
362			free(u->src);
363			free(u->dst);
364			if ((t->flags & TRANSPORT_LISTEN) && u->s >= 0)
365			close(u->s);
366
367			for (p = LIST_FIRST(&transport_list); p && p != t; p =
368			LIST_NEXT(p, link))
369			;
370			if (p == t)
371			LIST_REMOVE(t, link);
372
373			LOG_DBG((LOG_TRANSPORT, 90, "udp_remove: removed transport %p", t));
374			free(t);
375			}
376
377			/* Report transport-method specifics of the T transport. */
378			void
379			udp_report(struct transport *t)
380			{
381			struct udp_transport u = (struct udp_transport )t;
382			char src = NULL, dst = NULL;
383			in_port_t sport, dport;
384
385			if (sockaddr2text(u->src, &src, 0))
386			return;
387			sport = sockaddr_port(u->src);
388
389			if (!u->dst \|\| sockaddr2text(u->dst, &dst, 0))
390			dst = 0;
391			dport = dst ? sockaddr_port(u->dst) : 0;
392
393			LOG_DBG((LOG_REPORT, 0, "udp_report: fd %d src %s:%u dst %s:%u", u->s,
394			src, ntohs(sport), dst ? dst : "<none>", ntohs(dport)));
395
396			free(dst);
397			free(src);
398			}
399
400			/*
401			* A message has arrived on transport T's socket. If T is single-ended,
402			* clone it into a double-ended transport which we will use from now on.
403			* Package the message as we want it and continue processing in the message
404			* module.
405			*/
406			static void
407			udp_handle_message(struct transport *t)
408			{
409			struct udp_transport u = (struct udp_transport )t;
410			u_int8_t buf[UDP_SIZE];
411			struct sockaddr_storage from;
412			u_int32_t len = sizeof from;
413			ssize_t n;
414			struct message *msg;
415
416			n = recvfrom(u->s, buf, UDP_SIZE, 0, (struct sockaddr *)&from, &len);
417			if (n == -1) {
418			log_error("recvfrom (%d, %p, %d, %d, %p, %p)", u->s, buf,
419			UDP_SIZE, 0, &from, &len);
420			return;
421			}
422
423			if (t->virtual == (struct transport *)virtual_get_default(AF_INET) \|\|
424			t->virtual == (struct transport *)virtual_get_default(AF_INET6)) {
425			t->virtual->vtbl->reinit();
426
427			/*
428			* As we don't know the actual destination address of the
429			* packet, we can't really deal with it. So, just ignore it
430			* and hope we catch the retransmission.
431			*/
432			return;
433			}
434
435			/*
436			* Make a specialized UDP transport structure out of the incoming
437			* transport and the address information we got from recvfrom(2).
438			*/
439			t = t->virtual->vtbl->clone(t->virtual, (struct sockaddr *)&from);
440			if (!t)
441			return;
442
443			msg = message_alloc(t, buf, n);
444			if (!msg) {
445			log_error("failed to allocate message structure, dropping "
446			"packet received on transport %p", u);
447			t->vtbl->remove(t);
448			return;
449			}
450			message_recv(msg);
451			}
452
453			/* Physically send the message MSG over its associated transport. */
454			static int
455			udp_send_message(struct message msg, struct transport t)
456			{
457			struct udp_transport u = (struct udp_transport )t;
458			ssize_t n;
459			struct msghdr m;
460
461			/*
462			* Sending on connected sockets requires that no destination address is
463			* given, or else EISCONN will occur.
464			*/
465			m.msg_name = (caddr_t) u->dst;
466			m.msg_namelen = SA_LEN(u->dst);
467			m.msg_iov = msg->iov;
468			m.msg_iovlen = msg->iovlen;
469			m.msg_control = 0;
470			m.msg_controllen = 0;
471			m.msg_flags = 0;
472			n = sendmsg(u->s, &m, 0);
473			if (n == -1) {
474			/* XXX We should check whether the address has gone away */
475			log_error("sendmsg (%d, %p, %d)", u->s, &m, 0);
476			return -1;
477			}
478			return 0;
479			}
480
481			int
482			udp_fd_set(struct transport t, fd_set fds, int bit)
483			{
484			struct udp_transport u = (struct udp_transport )t;
485
486			if (bit)
487			FD_SET(u->s, fds);
488			else
489			FD_CLR(u->s, fds);
490
491			return u->s + 1;
492			}
493
494			int
495			udp_fd_isset(struct transport t, fd_set fds)
496			{
497			struct udp_transport u = (struct udp_transport )t;
498
499			return FD_ISSET(u->s, fds);
500			}
501
502			/*
503			* Get transport T's peer address and stuff it into the sockaddr pointed
504			* to by DST.
505			*/
506			void
507			udp_get_dst(struct transport t, struct sockaddr *dst)
508			{
509			dst = ((struct udp_transport )t)->dst;
510			}
511
512			/*
513			* Get transport T's local address and stuff it into the sockaddr pointed
514			* to by SRC. Put its length into SRC_LEN.
515			*/
516			void
517			udp_get_src(struct transport t, struct sockaddr *src)
518			{
519			src = ((struct udp_transport )t)->src;
520			}
521
522			char *
523			udp_decode_ids(struct transport *t)
524			{
525			struct sockaddr src, dst;
526			static char result[1024];
527			char idsrc[256], iddst[256];
528
529			t->vtbl->get_src(t, &src);
530			t->vtbl->get_dst(t, &dst);
531
532			if (getnameinfo(src, SA_LEN(src), idsrc, sizeof idsrc, NULL, 0,
533			NI_NUMERICHOST) != 0) {
534			log_print("udp_decode_ids: getnameinfo () failed for 'src'");
535			strlcpy(idsrc, "<error>", 256);
536			}
537			if (getnameinfo(dst, SA_LEN(dst), iddst, sizeof iddst, NULL, 0,
538			NI_NUMERICHOST) != 0) {
539			log_print("udp_decode_ids: getnameinfo () failed for 'dst'");
540			strlcpy(iddst, "<error>", 256);
541			}
542
543			snprintf(result, sizeof result, "src: %s dst: %s", idsrc, iddst);
544			return result;
545			}