udp.c@ 15792

Last change on this file since 15792 was 15792, checked in by vboxsync, 16 years ago
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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
48
49	/*
50	* UDP protocol implementation.
51	* Per RFC 768, August, 1980.
52	*/
53	#define udpcksum 1
54
55	void
56	udp_init(PNATState pData)
57	{
58	udp_last_so = &udb;
59	udb.so_next = udb.so_prev = &udb;
60	}
61
62	/* m->m_data points at ip packet header
63	* m->m_len length ip packet
64	* ip->ip_len length data (IPDU)
65	*/
66	void
67	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
68	{
69	register struct ip *ip;
70	register struct udphdr *uh;
71	int len;
72	struct ip save_ip;
73	struct socket *so;
74	int ret;
75	int ttl;
76
77	DEBUG_CALL("udp_input");
78	DEBUG_ARG("m = %lx", (long)m);
79	DEBUG_ARG("iphlen = %d", iphlen);
80
81	udpstat.udps_ipackets++;
82
83	/*
84	* Strip IP options, if any; should skip this,
85	* make available to user, and use on returned packets,
86	* but we don't yet have a way to check the checksum
87	* with options still present.
88	*/
89	if (iphlen > sizeof(struct ip))
90	{
91	ip_stripoptions(m, (struct mbuf *)0);
92	iphlen = sizeof(struct ip);
93	}
94
95	/*
96	* Get IP and UDP header together in first mbuf.
97	*/
98	ip = mtod(m, struct ip *);
99	uh = (struct udphdr *)((caddr_t)ip + iphlen);
100
101	/*
102	* Make mbuf data length reflect UDP length.
103	* If not enough data to reflect UDP length, drop.
104	*/
105	len = ntohs((u_int16_t)uh->uh_ulen);
106
107	if (ip->ip_len != len)
108	{
109	if (len > ip->ip_len)
110	{
111	udpstat.udps_badlen++;
112	goto bad;
113	}
114	m_adj(m, len - ip->ip_len);
115	ip->ip_len = len;
116	}
117
118	/*
119	* Save a copy of the IP header in case we want restore it
120	* for sending an ICMP error message in response.
121	*/
122	save_ip = *ip;
123	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
124
125	/*
126	* Checksum extended UDP header and data.
127	*/
128	if (udpcksum && uh->uh_sum)
129	{
130	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
131	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
132	#if 0
133	/* keep uh_sum for ICMP reply */
134	uh->uh_sum = cksum(m, len + sizeof (struct ip));
135	if (uh->uh_sum)
136	{
137
138	#endif
139	if(cksum(m, len + sizeof(struct ip)))
140	{
141	udpstat.udps_badsum++;
142	goto bad;
143	}
144	}
145	#if 0
146	}
147	#endif
148
149	/*
150	* handle DHCP/BOOTP
151	*/
152	if (ntohs(uh->uh_dport) == BOOTP_SERVER)
153	{
154	bootp_input(pData, m);
155	goto bad;
156	}
157
158	/*
159	* handle TFTP
160	*/
161	if (ntohs(uh->uh_dport) == TFTP_SERVER)
162	{
163	tftp_input(pData, m);
164	goto bad;
165	}
166
167	/*
168	* Locate pcb for datagram.
169	*/
170	so = udp_last_so;
171	if ( so->so_lport != uh->uh_sport
172	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
173	{
174	struct socket *tmp;
175
176	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
177	{
178	if ( tmp->so_lport == uh->uh_sport
179	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
180	{
181	so = tmp;
182	break;
183	}
184	}
185	if (tmp == &udb)
186	so = NULL;
187	else
188	{
189	udpstat.udpps_pcbcachemiss++;
190	udp_last_so = so;
191	}
192	}
193
194	if (so == NULL)
195	{
196	/*
197	* If there's no socket for this packet,
198	* create one
199	*/
200	if ((so = socreate()) == NULL)
201	goto bad;
202	if (udp_attach(pData, so) == -1)
203	{
204	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
205	errno,strerror(errno)));
206	sofree(pData, so);
207	goto bad;
208	}
209
210	/*
211	* Setup fields
212	*/
213	/* udp_last_so = so; */
214	so->so_laddr = ip->ip_src;
215	so->so_lport = uh->uh_sport;
216
217	if ((so->so_iptos = udp_tos(so)) == 0)
218	so->so_iptos = ip->ip_tos;
219
220	/*
221	* XXXXX Here, check if it's in udpexec_list,
222	* and if it is, do the fork_exec() etc.
223	*/
224	}
225
226	so->so_faddr = ip->ip_dst; /* XXX */
227	so->so_fport = uh->uh_dport; /* XXX */
228
229	iphlen += sizeof(struct udphdr);
230	m->m_len -= iphlen;
231	m->m_data += iphlen;
232
233	/*
234	* Now we sendto() the packet.
235	*/
236	if (so->so_emu)
237	udp_emu(pData, so, m);
238
239	ttl = ip->ip_ttl = save_ip.ip_ttl;
240	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
241	if (ret < 0) {
242	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
243	}
244
245	if (sosendto(pData, so, m) == -1)
246	{
247	m->m_len += iphlen;
248	m->m_data -= iphlen;
249	*ip = save_ip;
250	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n", errno, strerror(errno)));
251	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0, strerror(errno));
252	}
253
254	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
255
256	/* restore the orig mbuf packet */
257	m->m_len += iphlen;
258	m->m_data -= iphlen;
259	*ip = save_ip;
260	so->so_m = m; /* ICMP backup */
261
262	return;
263
264	bad:
265	m_freem(pData, m);
266	return;
267	}
268
269	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
270	struct sockaddr_in saddr, struct sockaddr_in daddr,
271	int iptos)
272	{
273	register struct udpiphdr *ui;
274	int error = 0;
275
276	DEBUG_CALL("udp_output");
277	DEBUG_ARG("so = %lx", (long)so);
278	DEBUG_ARG("m = %lx", (long)m);
279	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
280	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
281
282	/*
283	* Adjust for header
284	*/
285	m->m_data -= sizeof(struct udpiphdr);
286	m->m_len += sizeof(struct udpiphdr);
287
288	/*
289	* Fill in mbuf with extended UDP header
290	* and addresses and length put into network format.
291	*/
292	ui = mtod(m, struct udpiphdr *);
293	memset(ui->ui_x1, 0, 9);
294	ui->ui_pr = IPPROTO_UDP;
295	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
296	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
297	ui->ui_src = saddr->sin_addr;
298	ui->ui_dst = daddr->sin_addr;
299	ui->ui_sport = saddr->sin_port;
300	ui->ui_dport = daddr->sin_port;
301	ui->ui_ulen = ui->ui_len;
302
303	/*
304	* Stuff checksum and output datagram.
305	*/
306	ui->ui_sum = 0;
307	if (udpcksum)
308	{
309	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
310	ui->ui_sum = 0xffff;
311	}
312	((struct ip *)ui)->ip_len = m->m_len;
313	((struct ip *)ui)->ip_ttl = ip_defttl;
314	((struct ip *)ui)->ip_tos = iptos;
315
316	udpstat.udps_opackets++;
317
318	error = ip_output(pData, so, m);
319
320	return error;
321	}
322
323	int udp_output(PNATState pData, struct socket so, struct mbuf m,
324	struct sockaddr_in *addr)
325	{
326	struct sockaddr_in saddr, daddr;
327
328	saddr = *addr;
329	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
330	{
331	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
332	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
333	saddr.sin_addr.s_addr = alias_addr.s_addr;
334	}
335
336	/* Any UDP packet to the loopback address must be translated to be from
337	* the forwarding address, i.e. 10.0.2.2. */
338	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
339	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
340	saddr.sin_addr.s_addr = alias_addr.s_addr;
341
342	daddr.sin_addr = so->so_laddr;
343	daddr.sin_port = so->so_lport;
344
345	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
346	}
347
348	int
349	udp_attach(PNATState pData, struct socket *so)
350	{
351	struct sockaddr_in addr;
352	struct sockaddr sa_addr;
353	socklen_t socklen = sizeof(struct sockaddr);
354	int status;
355
356	if ((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1)
357	{
358	/*
359	* Here, we bind() the socket. Although not really needed
360	* (sendto() on an unbound socket will bind it), it's done
361	* here so that emulation of ytalk etc. don't have to do it
362	*/
363	addr.sin_family = AF_INET;
364	addr.sin_port = 0;
365	addr.sin_addr.s_addr = INADDR_ANY;
366	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
367	{
368	int lasterrno = errno;
369	closesocket(so->s);
370	so->s = -1;
371	#ifdef RT_OS_WINDOWS
372	WSASetLastError(lasterrno);
373	#else
374	errno = lasterrno;
375	#endif
376	}
377	else
378	{
379	int opt = 1;
380	/* success, insert in queue */
381	so->so_expire = curtime + SO_EXPIRE;
382	/* enable broadcast for later use */
383	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
384	insque(pData, so,&udb);
385	status = getsockname(so->s, &sa_addr, &socklen);
386	Assert(status == 0 && sa_addr.sa_family == AF_INET);
387	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
388	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
389	}
390	}
391	return so->s;
392	}
393
394	void
395	udp_detach(PNATState pData, struct socket *so)
396	{
397	if (so != &pData->icmp_socket)
398	{
399	closesocket(so->s);
400	sofree(pData, so);
401	}
402	}
403
404	static const struct tos_t udptos[] =
405	{
406	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
407	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
408	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
409	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
410	{ 0, 0, 0, 0 }
411	};
412
413	u_int8_t
414	udp_tos(struct socket *so)
415	{
416	int i = 0;
417
418	while(udptos[i].tos)
419	{
420	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
421	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
422	{
423	so->so_emu = udptos[i].emu;
424	return udptos[i].tos;
425	}
426	i++;
427	}
428
429	return 0;
430	}
431
432	#ifdef EMULATE_TALK
433	#include "talkd.h"
434	#endif
435
436	/*
437	* Here, talk/ytalk/ntalk requests must be emulated
438	*/
439	void
440	udp_emu(PNATState pData, struct socket so, struct mbuf m)
441	{
442	struct sockaddr_in addr;
443	socklen_t addrlen = sizeof(addr);
444	#ifdef EMULATE_TALK
445	CTL_MSG_OLD *omsg;
446	CTL_MSG *nmsg;
447	char buff[sizeof(CTL_MSG)];
448	u_char type;
449
450	struct talk_request
451	{
452	struct talk_request *next;
453	struct socket *udp_so;
454	struct socket *tcp_so;
455	} *req;
456
457	static struct talk_request *req_tbl = 0;
458
459	#endif
460
461	struct cu_header
462	{
463	uint16_t d_family; /* destination family */
464	uint16_t d_port; /* destination port */
465	uint32_t d_addr; /* destination address */
466	uint16_t s_family; /* source family */
467	uint16_t s_port; /* source port */
468	uint32_t so_addr; /* source address */
469	uint32_t seqn; /* sequence number */
470	uint16_t message; /* message */
471	uint16_t data_type; /* data type */
472	uint16_t pkt_len; /* packet length */
473	} *cu_head;
474
475	switch(so->so_emu)
476	{
477	#ifdef EMULATE_TALK
478	case EMU_TALK:
479	case EMU_NTALK:
480	/*
481	* Talk emulation. We always change the ctl_addr to get
482	* some answers from the daemon. When an ANNOUNCE comes,
483	* we send LEAVE_INVITE to the local daemons. Also when a
484	* DELETE comes, we send copies to the local daemons.
485	*/
486	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
487	return;
488
489	#define IS_OLD (so->so_emu == EMU_TALK)
490
491	#define COPY_MSG(dest, src) \
492	do { \
493	dest->type = src->type; \
494	dest->id_num = src->id_num; \
495	dest->pid = src->pid; \
496	dest->addr = src->addr; \
497	dest->ctl_addr = src->ctl_addr; \
498	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
499	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
500	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
501	} while (0)
502
503	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
504	/* old_sockaddr to sockaddr_in */
505
506
507	if (IS_OLD)
508	{
509	/* old talk */
510	omsg = mtod(m, CTL_MSG_OLD*);
511	nmsg = (CTL_MSG *) buff;
512	type = omsg->type;
513	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
514	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
515	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
516	}
517	else
518	{
519	/* new talk */
520	omsg = (CTL_MSG_OLD *) buff;
521	nmsg = mtod(m, CTL_MSG *);
522	type = nmsg->type;
523	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
524	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
525	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
526	}
527
528	if (type == LOOK_UP)
529	return; /* for LOOK_UP this is enough */
530
531	if (IS_OLD)
532	{
533	/* make a copy of the message */
534	COPY_MSG(nmsg, omsg);
535	nmsg->vers = 1;
536	nmsg->answer = 0;
537	}
538	else
539	COPY_MSG(omsg, nmsg);
540
541	/*
542	* If if is an ANNOUNCE message, we go through the
543	* request table to see if a tcp port has already
544	* been redirected for this socket. If not, we solisten()
545	* a new socket and add this entry to the table.
546	* The port number of the tcp socket and our IP
547	* are put to the addr field of the message structures.
548	* Then a LEAVE_INVITE is sent to both local daemon
549	* ports, 517 and 518. This is why we have two copies
550	* of the message, one in old talk and one in new talk
551	* format.
552	*/
553
554	if (type == ANNOUNCE)
555	{
556	int s;
557	u_short temp_port;
558
559	for(req = req_tbl; req; req = req->next)
560	if (so == req->udp_so)
561	break; /* found it */
562
563	if (!req)
564	{
565	/* no entry for so, create new */
566	req = (struct talk_request *)RTMemAlloc(sizeof(struct talk_request));
567	req->udp_so = so;
568	req->tcp_so = solisten(0,
569	OTOSIN(omsg, addr)->sin_addr.s_addr,
570	OTOSIN(omsg, addr)->sin_port,
571	SS_FACCEPTONCE);
572	req->next = req_tbl;
573	req_tbl = req;
574	}
575
576	/* replace port number in addr field */
577	addrlen = sizeof(addr);
578	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
579	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
580	OTOSIN(omsg, addr)->sin_addr = our_addr;
581	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
582	OTOSIN(nmsg, addr)->sin_addr = our_addr;
583
584	/* send LEAVE_INVITEs */
585	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
586	OTOSIN(omsg, ctl_addr)->sin_port = 0;
587	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
588	omsg->type = nmsg->type = LEAVE_INVITE;
589
590	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
591	addr.sin_addr = our_addr;
592	addr.sin_family = AF_INET;
593	addr.sin_port = htons(517);
594	sendto(s, (char )omsg, sizeof(omsg), 0,
595	(struct sockaddr *)&addr, sizeof(addr));
596	addr.sin_port = htons(518);
597	sendto(s, (char )nmsg, sizeof(nmsg), 0,
598	(struct sockaddr *) &addr, sizeof(addr));
599	closesocket(s) ;
600
601	omsg->type = nmsg->type = ANNOUNCE;
602	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
603	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
604	}
605
606	/*
607	* If it is a DELETE message, we send a copy to the
608	* local daemons. Then we delete the entry corresponding
609	* to our socket from the request table.
610	*/
611
612	if (type == DELETE)
613	{
614	struct talk_request temp_req, req_next;
615	int s;
616	u_short temp_port;
617
618	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
619	OTOSIN(omsg, ctl_addr)->sin_port = 0;
620	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
621
622	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
623	addr.sin_addr = our_addr;
624	addr.sin_family = AF_INET;
625	addr.sin_port = htons(517);
626	sendto(s, (char )omsg, sizeof(omsg), 0,
627	(struct sockaddr *)&addr, sizeof(addr));
628	addr.sin_port = htons(518);
629	sendto(s, (char )nmsg, sizeof(nmsg), 0,
630	(struct sockaddr *)&addr, sizeof(addr));
631	closesocket(s);
632
633	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
634	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
635
636	/* delete table entry */
637	if (so == req_tbl->udp_so)
638	{
639	temp_req = req_tbl;
640	req_tbl = req_tbl->next;
641	RTMemFree(temp_req);
642	}
643	else
644	{
645	temp_req = req_tbl;
646	for (req = req_tbl->next; req; req = req_next)
647	{
648	req_next = req->next;
649	if (so == req->udp_so)
650	{
651	temp_req->next = req_next;
652	RTMemFree(req);
653	break;
654	}
655	else
656	temp_req = req;
657	}
658	}
659	}
660
661	return;
662	#endif
663
664	case EMU_CUSEEME:
665	/*
666	* Cu-SeeMe emulation.
667	* Hopefully the packet is more that 16 bytes long. We don't
668	* do any other tests, just replace the address and port
669	* fields.
670	*/
671	if (m->m_len >= sizeof (*cu_head))
672	{
673	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
674	return;
675	cu_head = mtod(m, struct cu_header *);
676	cu_head->s_port = addr.sin_port;
677	cu_head->so_addr = our_addr.s_addr;
678	}
679	return;
680	}
681	}
682
683	struct socket *
684	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
685	{
686	struct sockaddr_in addr;
687	struct socket *so;
688	socklen_t addrlen = sizeof(struct sockaddr_in);
689	int opt = 1;
690
691	if ((so = socreate()) == NULL)
692	return NULL;
693
694	so->s = socket(AF_INET,SOCK_DGRAM,0);
695	so->so_expire = curtime + SO_EXPIRE;
696	insque(pData, so,&udb);
697
698	addr.sin_family = AF_INET;
699	addr.sin_addr.s_addr = INADDR_ANY;
700	addr.sin_port = port;
701
702	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
703	{
704	udp_detach(pData, so);
705	return NULL;
706	}
707	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
708	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
709
710	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
711	so->so_fport = addr.sin_port;
712	/* The original check was completely broken, as the commented out
713	* if statement was always true (INADDR_ANY=0). */
714	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
715	if (1 == 0) /* always use the else part */
716	so->so_faddr = alias_addr;
717	else
718	so->so_faddr = addr.sin_addr;
719
720	so->so_lport = lport;
721	so->so_laddr.s_addr = laddr;
722	if (flags != SS_FACCEPTONCE)
723	so->so_expire = 0;
724
725	so->so_state = SS_ISFCONNECTED;
726
727	return so;
728	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 15792

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