udp.c@ 16226

Last change on this file since 16226 was 16213, checked in by vboxsync, 16 years ago

NAT:

introduces TFTP special_address | CTL_TFTP(4) for built-in address
can connect to other then built-in tftp

Property svn:eol-style set to native

File size: 22.1 KB

Line
1	/*
2	* Copyright (c) 1982, 1986, 1988, 1990, 1993
3	* The Regents of the University of California. All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions
7	* are met:
8	* 1. Redistributions of source code must retain the above copyright
9	* notice, this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	* 3. All advertising materials mentioning features or use of this software
14	* must display the following acknowledgement:
15	* This product includes software developed by the University of
16	* California, Berkeley and its contributors.
17	* 4. Neither the name of the University nor the names of its contributors
18	* may be used to endorse or promote products derived from this software
19	* without specific prior written permission.
20	*
21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31	* SUCH DAMAGE.
32	*
33	* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
34	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
35	*/
36
37	/*
38	* Changes and additions relating to SLiRP
39	* Copyright (c) 1995 Danny Gasparovski.
40	*
41	* Please read the file COPYRIGHT for the
42	* terms and conditions of the copyright.
43	*/
44
45	#include <slirp.h>
46	#include "ip_icmp.h"
47	#include "ctl.h"
48
49
50	/*
51	* UDP protocol implementation.
52	* Per RFC 768, August, 1980.
53	*/
54	#define udpcksum 1
55
56	void
57	udp_init(PNATState pData)
58	{
59	udp_last_so = &udb;
60	udb.so_next = udb.so_prev = &udb;
61	}
62
63	/* m->m_data points at ip packet header
64	* m->m_len length ip packet
65	* ip->ip_len length data (IPDU)
66	*/
67	void
68	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
69	{
70	register struct ip *ip;
71	register struct udphdr *uh;
72	int len;
73	struct ip save_ip;
74	struct socket *so;
75	int ret;
76	int ttl;
77
78	DEBUG_CALL("udp_input");
79	DEBUG_ARG("m = %lx", (long)m);
80	DEBUG_ARG("iphlen = %d", iphlen);
81
82	udpstat.udps_ipackets++;
83
84	/*
85	* Strip IP options, if any; should skip this,
86	* make available to user, and use on returned packets,
87	* but we don't yet have a way to check the checksum
88	* with options still present.
89	*/
90	if (iphlen > sizeof(struct ip))
91	{
92	ip_stripoptions(m, (struct mbuf *)0);
93	iphlen = sizeof(struct ip);
94	}
95
96	/*
97	* Get IP and UDP header together in first mbuf.
98	*/
99	ip = mtod(m, struct ip *);
100	uh = (struct udphdr *)((caddr_t)ip + iphlen);
101
102	/*
103	* Make mbuf data length reflect UDP length.
104	* If not enough data to reflect UDP length, drop.
105	*/
106	len = ntohs((u_int16_t)uh->uh_ulen);
107
108	if (ip->ip_len != len)
109	{
110	if (len > ip->ip_len)
111	{
112	udpstat.udps_badlen++;
113	goto bad;
114	}
115	m_adj(m, len - ip->ip_len);
116	ip->ip_len = len;
117	}
118
119	/*
120	* Save a copy of the IP header in case we want restore it
121	* for sending an ICMP error message in response.
122	*/
123	save_ip = *ip;
124	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
125
126	/*
127	* Checksum extended UDP header and data.
128	*/
129	if (udpcksum && uh->uh_sum)
130	{
131	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
132	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
133	#if 0
134	/* keep uh_sum for ICMP reply */
135	uh->uh_sum = cksum(m, len + sizeof (struct ip));
136	if (uh->uh_sum)
137	{
138
139	#endif
140	if(cksum(m, len + sizeof(struct ip)))
141	{
142	udpstat.udps_badsum++;
143	goto bad;
144	}
145	}
146	#if 0
147	}
148	#endif
149
150	/*
151	* handle DHCP/BOOTP
152	*/
153	if (ntohs(uh->uh_dport) == BOOTP_SERVER)
154	{
155	bootp_input(pData, m);
156	goto bad;
157	}
158
159	/*
160	* handle TFTP
161	*/
162	if ( ntohs(uh->uh_dport) == TFTP_SERVER
163	&& CTL_CHECK(ntohl(ip->ip_dst.s_addr), CTL_TFTP))
164	{
165	tftp_input(pData, m);
166	goto bad;
167	}
168
169	/*
170	* Locate pcb for datagram.
171	*/
172	so = udp_last_so;
173	if ( so->so_lport != uh->uh_sport
174	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
175	{
176	struct socket *tmp;
177
178	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
179	{
180	if ( tmp->so_lport == uh->uh_sport
181	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
182	{
183	so = tmp;
184	break;
185	}
186	}
187	if (tmp == &udb)
188	so = NULL;
189	else
190	{
191	udpstat.udpps_pcbcachemiss++;
192	udp_last_so = so;
193	}
194	}
195
196	if (so == NULL)
197	{
198	/*
199	* If there's no socket for this packet,
200	* create one
201	*/
202	if ((so = socreate()) == NULL)
203	goto bad;
204	if (udp_attach(pData, so) == -1)
205	{
206	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
207	errno,strerror(errno)));
208	sofree(pData, so);
209	goto bad;
210	}
211
212	/*
213	* Setup fields
214	*/
215	/* udp_last_so = so; */
216	so->so_laddr = ip->ip_src;
217	so->so_lport = uh->uh_sport;
218
219	if ((so->so_iptos = udp_tos(so)) == 0)
220	so->so_iptos = ip->ip_tos;
221
222	/*
223	* XXXXX Here, check if it's in udpexec_list,
224	* and if it is, do the fork_exec() etc.
225	*/
226	}
227
228	so->so_faddr = ip->ip_dst; /* XXX */
229	so->so_fport = uh->uh_dport; /* XXX */
230
231	iphlen += sizeof(struct udphdr);
232	m->m_len -= iphlen;
233	m->m_data += iphlen;
234
235	/*
236	* Now we sendto() the packet.
237	*/
238	if (so->so_emu)
239	udp_emu(pData, so, m);
240
241	ttl = ip->ip_ttl = save_ip.ip_ttl;
242	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
243	if (ret < 0)
244	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
245	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
246
247	if (sosendto(pData, so, m) == -1)
248	{
249	m->m_len += iphlen;
250	m->m_data -= iphlen;
251	*ip = save_ip;
252	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n", errno, strerror(errno)));
253	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0, strerror(errno));
254	}
255
256	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
257
258	/* restore the orig mbuf packet */
259	m->m_len += iphlen;
260	m->m_data -= iphlen;
261	*ip = save_ip;
262	so->so_m = m; /* ICMP backup */
263
264	return;
265
266	bad:
267	m_freem(pData, m);
268	return;
269	}
270
271	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
272	struct sockaddr_in saddr, struct sockaddr_in daddr,
273	int iptos)
274	{
275	register struct udpiphdr *ui;
276	int error = 0;
277
278	DEBUG_CALL("udp_output");
279	DEBUG_ARG("so = %lx", (long)so);
280	DEBUG_ARG("m = %lx", (long)m);
281	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
282	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
283
284	/*
285	* Adjust for header
286	*/
287	m->m_data -= sizeof(struct udpiphdr);
288	m->m_len += sizeof(struct udpiphdr);
289
290	/*
291	* Fill in mbuf with extended UDP header
292	* and addresses and length put into network format.
293	*/
294	ui = mtod(m, struct udpiphdr *);
295	memset(ui->ui_x1, 0, 9);
296	ui->ui_pr = IPPROTO_UDP;
297	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
298	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
299	ui->ui_src = saddr->sin_addr;
300	ui->ui_dst = daddr->sin_addr;
301	ui->ui_sport = saddr->sin_port;
302	ui->ui_dport = daddr->sin_port;
303	ui->ui_ulen = ui->ui_len;
304
305	/*
306	* Stuff checksum and output datagram.
307	*/
308	ui->ui_sum = 0;
309	if (udpcksum)
310	{
311	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
312	ui->ui_sum = 0xffff;
313	}
314	((struct ip *)ui)->ip_len = m->m_len;
315	((struct ip *)ui)->ip_ttl = ip_defttl;
316	((struct ip *)ui)->ip_tos = iptos;
317
318	udpstat.udps_opackets++;
319
320	error = ip_output(pData, so, m);
321
322	return error;
323	}
324
325	int udp_output(PNATState pData, struct socket so, struct mbuf m,
326	struct sockaddr_in *addr)
327	{
328	struct sockaddr_in saddr, daddr;
329
330	saddr = *addr;
331	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
332	{
333	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
334	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
335	saddr.sin_addr.s_addr = alias_addr.s_addr;
336	}
337
338	/* Any UDP packet to the loopback address must be translated to be from
339	* the forwarding address, i.e. 10.0.2.2. */
340	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
341	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
342	saddr.sin_addr.s_addr = alias_addr.s_addr;
343
344	daddr.sin_addr = so->so_laddr;
345	daddr.sin_port = so->so_lport;
346
347	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
348	}
349
350	int
351	udp_attach(PNATState pData, struct socket *so)
352	{
353	struct sockaddr_in addr;
354	struct sockaddr sa_addr;
355	socklen_t socklen = sizeof(struct sockaddr);
356	int status;
357
358	if ((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1)
359	{
360	/*
361	* Here, we bind() the socket. Although not really needed
362	* (sendto() on an unbound socket will bind it), it's done
363	* here so that emulation of ytalk etc. don't have to do it
364	*/
365	addr.sin_family = AF_INET;
366	addr.sin_port = 0;
367	addr.sin_addr.s_addr = INADDR_ANY;
368	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
369	{
370	int lasterrno = errno;
371	closesocket(so->s);
372	so->s = -1;
373	#ifdef RT_OS_WINDOWS
374	WSASetLastError(lasterrno);
375	#else
376	errno = lasterrno;
377	#endif
378	}
379	else
380	{
381	int opt = 1;
382	/* success, insert in queue */
383	so->so_expire = curtime + SO_EXPIRE;
384	/* enable broadcast for later use */
385	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
386	insque(pData, so,&udb);
387	status = getsockname(so->s, &sa_addr, &socklen);
388	Assert(status == 0 && sa_addr.sa_family == AF_INET);
389	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
390	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
391	}
392	}
393	return so->s;
394	}
395
396	void
397	udp_detach(PNATState pData, struct socket *so)
398	{
399	if (so != &pData->icmp_socket)
400	{
401	closesocket(so->s);
402	sofree(pData, so);
403	}
404	}
405
406	static const struct tos_t udptos[] =
407	{
408	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
409	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
410	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
411	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
412	{ 0, 0, 0, 0 }
413	};
414
415	u_int8_t
416	udp_tos(struct socket *so)
417	{
418	int i = 0;
419
420	while(udptos[i].tos)
421	{
422	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
423	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
424	{
425	so->so_emu = udptos[i].emu;
426	return udptos[i].tos;
427	}
428	i++;
429	}
430
431	return 0;
432	}
433
434	#ifdef EMULATE_TALK
435	#include "talkd.h"
436	#endif
437
438	/*
439	* Here, talk/ytalk/ntalk requests must be emulated
440	*/
441	void
442	udp_emu(PNATState pData, struct socket so, struct mbuf m)
443	{
444	struct sockaddr_in addr;
445	socklen_t addrlen = sizeof(addr);
446	#ifdef EMULATE_TALK
447	CTL_MSG_OLD *omsg;
448	CTL_MSG *nmsg;
449	char buff[sizeof(CTL_MSG)];
450	u_char type;
451
452	struct talk_request
453	{
454	struct talk_request *next;
455	struct socket *udp_so;
456	struct socket *tcp_so;
457	} *req;
458
459	static struct talk_request *req_tbl = 0;
460
461	#endif
462
463	struct cu_header
464	{
465	uint16_t d_family; /* destination family */
466	uint16_t d_port; /* destination port */
467	uint32_t d_addr; /* destination address */
468	uint16_t s_family; /* source family */
469	uint16_t s_port; /* source port */
470	uint32_t so_addr; /* source address */
471	uint32_t seqn; /* sequence number */
472	uint16_t message; /* message */
473	uint16_t data_type; /* data type */
474	uint16_t pkt_len; /* packet length */
475	} *cu_head;
476
477	switch(so->so_emu)
478	{
479	#ifdef EMULATE_TALK
480	case EMU_TALK:
481	case EMU_NTALK:
482	/*
483	* Talk emulation. We always change the ctl_addr to get
484	* some answers from the daemon. When an ANNOUNCE comes,
485	* we send LEAVE_INVITE to the local daemons. Also when a
486	* DELETE comes, we send copies to the local daemons.
487	*/
488	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
489	return;
490
491	#define IS_OLD (so->so_emu == EMU_TALK)
492
493	#define COPY_MSG(dest, src) \
494	do { \
495	dest->type = src->type; \
496	dest->id_num = src->id_num; \
497	dest->pid = src->pid; \
498	dest->addr = src->addr; \
499	dest->ctl_addr = src->ctl_addr; \
500	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
501	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
502	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
503	} while (0)
504
505	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
506	/* old_sockaddr to sockaddr_in */
507
508
509	if (IS_OLD)
510	{
511	/* old talk */
512	omsg = mtod(m, CTL_MSG_OLD*);
513	nmsg = (CTL_MSG *) buff;
514	type = omsg->type;
515	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
516	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
517	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
518	}
519	else
520	{
521	/* new talk */
522	omsg = (CTL_MSG_OLD *) buff;
523	nmsg = mtod(m, CTL_MSG *);
524	type = nmsg->type;
525	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
526	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
527	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
528	}
529
530	if (type == LOOK_UP)
531	return; /* for LOOK_UP this is enough */
532
533	if (IS_OLD)
534	{
535	/* make a copy of the message */
536	COPY_MSG(nmsg, omsg);
537	nmsg->vers = 1;
538	nmsg->answer = 0;
539	}
540	else
541	COPY_MSG(omsg, nmsg);
542
543	/*
544	* If if is an ANNOUNCE message, we go through the
545	* request table to see if a tcp port has already
546	* been redirected for this socket. If not, we solisten()
547	* a new socket and add this entry to the table.
548	* The port number of the tcp socket and our IP
549	* are put to the addr field of the message structures.
550	* Then a LEAVE_INVITE is sent to both local daemon
551	* ports, 517 and 518. This is why we have two copies
552	* of the message, one in old talk and one in new talk
553	* format.
554	*/
555
556	if (type == ANNOUNCE)
557	{
558	int s;
559	u_short temp_port;
560
561	for(req = req_tbl; req; req = req->next)
562	if (so == req->udp_so)
563	break; /* found it */
564
565	if (!req)
566	{
567	/* no entry for so, create new */
568	req = (struct talk_request *)RTMemAlloc(sizeof(struct talk_request));
569	req->udp_so = so;
570	req->tcp_so = solisten(0,
571	OTOSIN(omsg, addr)->sin_addr.s_addr,
572	OTOSIN(omsg, addr)->sin_port,
573	SS_FACCEPTONCE);
574	req->next = req_tbl;
575	req_tbl = req;
576	}
577
578	/* replace port number in addr field */
579	addrlen = sizeof(addr);
580	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
581	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
582	OTOSIN(omsg, addr)->sin_addr = our_addr;
583	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
584	OTOSIN(nmsg, addr)->sin_addr = our_addr;
585
586	/* send LEAVE_INVITEs */
587	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
588	OTOSIN(omsg, ctl_addr)->sin_port = 0;
589	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
590	omsg->type = nmsg->type = LEAVE_INVITE;
591
592	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
593	addr.sin_addr = our_addr;
594	addr.sin_family = AF_INET;
595	addr.sin_port = htons(517);
596	sendto(s, (char )omsg, sizeof(omsg), 0,
597	(struct sockaddr *)&addr, sizeof(addr));
598	addr.sin_port = htons(518);
599	sendto(s, (char )nmsg, sizeof(nmsg), 0,
600	(struct sockaddr *) &addr, sizeof(addr));
601	closesocket(s) ;
602
603	omsg->type = nmsg->type = ANNOUNCE;
604	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
605	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
606	}
607
608	/*
609	* If it is a DELETE message, we send a copy to the
610	* local daemons. Then we delete the entry corresponding
611	* to our socket from the request table.
612	*/
613
614	if (type == DELETE)
615	{
616	struct talk_request temp_req, req_next;
617	int s;
618	u_short temp_port;
619
620	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
621	OTOSIN(omsg, ctl_addr)->sin_port = 0;
622	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
623
624	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
625	addr.sin_addr = our_addr;
626	addr.sin_family = AF_INET;
627	addr.sin_port = htons(517);
628	sendto(s, (char )omsg, sizeof(omsg), 0,
629	(struct sockaddr *)&addr, sizeof(addr));
630	addr.sin_port = htons(518);
631	sendto(s, (char )nmsg, sizeof(nmsg), 0,
632	(struct sockaddr *)&addr, sizeof(addr));
633	closesocket(s);
634
635	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
636	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
637
638	/* delete table entry */
639	if (so == req_tbl->udp_so)
640	{
641	temp_req = req_tbl;
642	req_tbl = req_tbl->next;
643	RTMemFree(temp_req);
644	}
645	else
646	{
647	temp_req = req_tbl;
648	for (req = req_tbl->next; req; req = req_next)
649	{
650	req_next = req->next;
651	if (so == req->udp_so)
652	{
653	temp_req->next = req_next;
654	RTMemFree(req);
655	break;
656	}
657	else
658	temp_req = req;
659	}
660	}
661	}
662
663	return;
664	#endif
665
666	case EMU_CUSEEME:
667	/*
668	* Cu-SeeMe emulation.
669	* Hopefully the packet is more that 16 bytes long. We don't
670	* do any other tests, just replace the address and port
671	* fields.
672	*/
673	if (m->m_len >= sizeof (*cu_head))
674	{
675	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
676	return;
677	cu_head = mtod(m, struct cu_header *);
678	cu_head->s_port = addr.sin_port;
679	cu_head->so_addr = our_addr.s_addr;
680	}
681	return;
682	}
683	}
684
685	struct socket *
686	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
687	{
688	struct sockaddr_in addr;
689	struct socket *so;
690	socklen_t addrlen = sizeof(struct sockaddr_in);
691	int opt = 1;
692
693	if ((so = socreate()) == NULL)
694	return NULL;
695
696	so->s = socket(AF_INET,SOCK_DGRAM,0);
697	so->so_expire = curtime + SO_EXPIRE;
698	insque(pData, so,&udb);
699
700	addr.sin_family = AF_INET;
701	addr.sin_addr.s_addr = INADDR_ANY;
702	addr.sin_port = port;
703
704	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
705	{
706	udp_detach(pData, so);
707	return NULL;
708	}
709	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
710	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
711
712	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
713	so->so_fport = addr.sin_port;
714	/* The original check was completely broken, as the commented out
715	* if statement was always true (INADDR_ANY=0). */
716	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
717	if (1 == 0) /* always use the else part */
718	so->so_faddr = alias_addr;
719	else
720	so->so_faddr = addr.sin_addr;
721
722	so->so_lport = lport;
723	so->so_laddr.s_addr = laddr;
724	if (flags != SS_FACCEPTONCE)
725	so->so_expire = 0;
726
727	so->so_state = SS_ISFCONNECTED;
728
729	return so;
730	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 16226

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