udp.c@ 15232

Last change on this file since 15232 was 15231, checked in by vboxsync, 16 years ago
slirp:icmp: udp stored bind parameters to slirp socket structure
Property svn:eol-style set to `native`
File size: 23.6 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
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	/* struct mbuf opts = 0;/
72	int len;
73	struct ip save_ip;
74	struct socket *so;
75
76	DEBUG_CALL("udp_input");
77	DEBUG_ARG("m = %lx", (long)m);
78	DEBUG_ARG("iphlen = %d", iphlen);
79
80	udpstat.udps_ipackets++;
81
82	/*
83	* Strip IP options, if any; should skip this,
84	* make available to user, and use on returned packets,
85	* but we don't yet have a way to check the checksum
86	* with options still present.
87	*/
88	if(iphlen > sizeof(struct ip)) {
89	ip_stripoptions(m, (struct mbuf *)0);
90	iphlen = sizeof(struct ip);
91	}
92
93	/*
94	* Get IP and UDP header together in first mbuf.
95	*/
96	ip = mtod(m, struct ip *);
97	uh = (struct udphdr *)((caddr_t)ip + iphlen);
98
99	/*
100	* Make mbuf data length reflect UDP length.
101	* If not enough data to reflect UDP length, drop.
102	*/
103	len = ntohs((u_int16_t)uh->uh_ulen);
104
105	if (ip->ip_len != len) {
106	if (len > ip->ip_len) {
107	udpstat.udps_badlen++;
108	goto bad;
109	}
110	m_adj(m, len - ip->ip_len);
111	ip->ip_len = len;
112	}
113
114	/*
115	* Save a copy of the IP header in case we want restore it
116	* for sending an ICMP error message in response.
117	*/
118	save_ip = *ip;
119	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
120
121	/*
122	* Checksum extended UDP header and data.
123	*/
124	if (udpcksum && uh->uh_sum) {
125	#if !defined(VBOX_WITH_BSD_REASS)
126	((struct ipovly *)ip)->ih_next = 0;
127	((struct ipovly *)ip)->ih_prev = 0;
128	((struct ipovly *)ip)->ih_x1 = 0;
129	#else
130	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
131	#endif
132	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
133	/* keep uh_sum for ICMP reply
134	* uh->uh_sum = cksum(m, len + sizeof (struct ip));
135	* if (uh->uh_sum) {
136	*/
137	if(cksum(m, len + sizeof(struct ip))) {
138	udpstat.udps_badsum++;
139	goto bad;
140	}
141	}
142
143	/*
144	* handle DHCP/BOOTP
145	*/
146	if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
147	bootp_input(pData, m);
148	goto bad;
149	}
150
151	/*
152	* handle TFTP
153	*/
154	if (ntohs(uh->uh_dport) == TFTP_SERVER) {
155	tftp_input(pData, m);
156	goto bad;
157	}
158
159	/*
160	* Locate pcb for datagram.
161	*/
162	so = udp_last_so;
163	if (so->so_lport != uh->uh_sport \|\|
164	so->so_laddr.s_addr != ip->ip_src.s_addr) {
165	struct socket *tmp;
166
167	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
168	if (tmp->so_lport == uh->uh_sport &&
169	tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
170	so = tmp;
171	break;
172	}
173	}
174	if (tmp == &udb) {
175	so = NULL;
176	} else {
177	udpstat.udpps_pcbcachemiss++;
178	udp_last_so = so;
179	}
180	}
181
182	if (so == NULL) {
183	/*
184	* If there's no socket for this packet,
185	* create one
186	*/
187	if ((so = socreate()) == NULL) goto bad;
188	if(udp_attach(pData, so) == -1) {
189	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
190	errno,strerror(errno)));
191	sofree(pData, so);
192	goto bad;
193	}
194
195	/*
196	* Setup fields
197	*/
198	/* udp_last_so = so; */
199	so->so_laddr = ip->ip_src;
200	so->so_lport = uh->uh_sport;
201
202	if ((so->so_iptos = udp_tos(so)) == 0)
203	so->so_iptos = ip->ip_tos;
204
205	/*
206	* XXXXX Here, check if it's in udpexec_list,
207	* and if it is, do the fork_exec() etc.
208	*/
209	}
210
211	so->so_faddr = ip->ip_dst; /* XXX */
212	so->so_fport = uh->uh_dport; /* XXX */
213
214	iphlen += sizeof(struct udphdr);
215	m->m_len -= iphlen;
216	m->m_data += iphlen;
217
218	/*
219	* Now we sendto() the packet.
220	*/
221	if (so->so_emu)
222	udp_emu(pData, so, m);
223
224	if(sosendto(pData, so,m) == -1) {
225	m->m_len += iphlen;
226	m->m_data -= iphlen;
227	*ip=save_ip;
228	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
229	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
230	}
231
232	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
233
234	/* restore the orig mbuf packet */
235	m->m_len += iphlen;
236	m->m_data -= iphlen;
237	*ip=save_ip;
238	so->so_m=m; /* ICMP backup */
239
240	return;
241	bad:
242	m_freem(pData, m);
243	/* if (opts) m_freem(opts); */
244	return;
245	}
246
247	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
248	struct sockaddr_in saddr, struct sockaddr_in daddr,
249	int iptos)
250	{
251	register struct udpiphdr *ui;
252	int error = 0;
253
254	DEBUG_CALL("udp_output");
255	DEBUG_ARG("so = %lx", (long)so);
256	DEBUG_ARG("m = %lx", (long)m);
257	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
258	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
259
260	/*
261	* Adjust for header
262	*/
263	m->m_data -= sizeof(struct udpiphdr);
264	m->m_len += sizeof(struct udpiphdr);
265
266	/*
267	* Fill in mbuf with extended UDP header
268	* and addresses and length put into network format.
269	*/
270	ui = mtod(m, struct udpiphdr *);
271	#if !defined(VBOX_WITH_BSD_REASS)
272	ui->ui_next = ui->ui_prev = 0;
273	ui->ui_x1 = 0;
274	#else
275	memset(ui->ui_x1, 0, 9);
276	#endif
277	ui->ui_pr = IPPROTO_UDP;
278	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
279	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
280	ui->ui_src = saddr->sin_addr;
281	ui->ui_dst = daddr->sin_addr;
282	ui->ui_sport = saddr->sin_port;
283	ui->ui_dport = daddr->sin_port;
284	ui->ui_ulen = ui->ui_len;
285
286	/*
287	* Stuff checksum and output datagram.
288	*/
289	ui->ui_sum = 0;
290	if (udpcksum) {
291	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
292	ui->ui_sum = 0xffff;
293	}
294	((struct ip *)ui)->ip_len = m->m_len;
295
296	((struct ip *)ui)->ip_ttl = ip_defttl;
297	((struct ip *)ui)->ip_tos = iptos;
298
299	udpstat.udps_opackets++;
300
301	error = ip_output(pData, so, m);
302
303	return (error);
304	}
305
306	int udp_output(PNATState pData, struct socket so, struct mbuf m,
307	struct sockaddr_in *addr)
308	{
309	struct sockaddr_in saddr, daddr;
310
311	saddr = *addr;
312	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr) {
313	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
314	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
315	saddr.sin_addr.s_addr = alias_addr.s_addr;
316	}
317	/* Any UDP packet to the loopback address must be translated to be from
318	* the forwarding address, i.e. 10.0.2.2. */
319	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
320	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
321	saddr.sin_addr.s_addr = alias_addr.s_addr;
322
323	daddr.sin_addr = so->so_laddr;
324	daddr.sin_port = so->so_lport;
325
326	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
327	}
328
329	int
330	udp_attach(PNATState pData, struct socket *so)
331	{
332	struct sockaddr_in addr;
333
334	if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
335	/*
336	* Here, we bind() the socket. Although not really needed
337	* (sendto() on an unbound socket will bind it), it's done
338	* here so that emulation of ytalk etc. don't have to do it
339	*/
340	addr.sin_family = AF_INET;
341	addr.sin_port = 0;
342	addr.sin_addr.s_addr = INADDR_ANY;
343	if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
344	int lasterrno=errno;
345	closesocket(so->s);
346	so->s=-1;
347	#ifdef RT_OS_WINDOWS
348	WSASetLastError(lasterrno);
349	#else
350	errno=lasterrno;
351	#endif
352	} else {
353	int opt = 1;
354	/* success, insert in queue */
355	so->so_expire = curtime + SO_EXPIRE;
356	/* enable broadcast for later use */
357	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
358	insque(pData, so,&udb);
359	#ifdef VBOX_WITH_SLIRP_ICMP
360	so->so_hlport = addr.sin_port;
361	so->so_hladdr.s_addr = addr.sin_addr.s_addr;
362	#endif
363	}
364	}
365	return(so->s);
366	}
367
368	void
369	udp_detach(PNATState pData, struct socket *so)
370	{
371	/* Correctly update list if detaching last socket in list. */
372	if (so == udp_last_so) udp_last_so = &udb;
373	closesocket(so->s);
374	/* if (so->so_m) m_free(so->so_m); done by sofree */
375
376	sofree(pData, so);
377	}
378
379	static const struct tos_t udptos[] = {
380	{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
381	{517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
382	{518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
383	{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
384	{0, 0, 0, 0}
385	};
386
387	u_int8_t
388	udp_tos(so)
389	struct socket *so;
390	{
391	int i = 0;
392
393	while(udptos[i].tos) {
394	if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) \|\|
395	(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
396	so->so_emu = udptos[i].emu;
397	return udptos[i].tos;
398	}
399	i++;
400	}
401
402	return 0;
403	}
404
405	#ifdef EMULATE_TALK
406	#include "talkd.h"
407	#endif
408
409	/*
410	* Here, talk/ytalk/ntalk requests must be emulated
411	*/
412	void
413	udp_emu(PNATState pData, struct socket so, struct mbuf m)
414	{
415	struct sockaddr_in addr;
416	socklen_t addrlen = sizeof(addr);
417	#ifdef EMULATE_TALK
418	CTL_MSG_OLD *omsg;
419	CTL_MSG *nmsg;
420	char buff[sizeof(CTL_MSG)];
421	u_char type;
422
423	struct talk_request {
424	struct talk_request *next;
425	struct socket *udp_so;
426	struct socket *tcp_so;
427	} *req;
428
429	static struct talk_request *req_tbl = 0;
430
431	#endif
432
433	struct cu_header {
434	uint16_t d_family; /* destination family */
435	uint16_t d_port; /* destination port */
436	uint32_t d_addr; /* destination address */
437	uint16_t s_family; /* source family */
438	uint16_t s_port; /* source port */
439	uint32_t so_addr; /* source address */
440	uint32_t seqn; /* sequence number */
441	uint16_t message; /* message */
442	uint16_t data_type; /* data type */
443	uint16_t pkt_len; /* packet length */
444	} *cu_head;
445
446	switch(so->so_emu) {
447
448	#ifdef EMULATE_TALK
449	case EMU_TALK:
450	case EMU_NTALK:
451	/*
452	* Talk emulation. We always change the ctl_addr to get
453	* some answers from the daemon. When an ANNOUNCE comes,
454	* we send LEAVE_INVITE to the local daemons. Also when a
455	* DELETE comes, we send copies to the local daemons.
456	*/
457	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
458	return;
459
460	#define IS_OLD (so->so_emu == EMU_TALK)
461
462	#define COPY_MSG(dest, src) { dest->type = src->type; \
463	dest->id_num = src->id_num; \
464	dest->pid = src->pid; \
465	dest->addr = src->addr; \
466	dest->ctl_addr = src->ctl_addr; \
467	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
468	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
469	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
470
471	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
472	/* old_sockaddr to sockaddr_in */
473
474
475	if (IS_OLD) { /* old talk */
476	omsg = mtod(m, CTL_MSG_OLD*);
477	nmsg = (CTL_MSG *) buff;
478	type = omsg->type;
479	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
480	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
481	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
482	} else { /* new talk */
483	omsg = (CTL_MSG_OLD *) buff;
484	nmsg = mtod(m, CTL_MSG *);
485	type = nmsg->type;
486	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
487	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
488	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
489	}
490
491	if (type == LOOK_UP)
492	return; /* for LOOK_UP this is enough */
493
494	if (IS_OLD) { /* make a copy of the message */
495	COPY_MSG(nmsg, omsg);
496	nmsg->vers = 1;
497	nmsg->answer = 0;
498	} else
499	COPY_MSG(omsg, nmsg);
500
501	/*
502	* If if is an ANNOUNCE message, we go through the
503	* request table to see if a tcp port has already
504	* been redirected for this socket. If not, we solisten()
505	* a new socket and add this entry to the table.
506	* The port number of the tcp socket and our IP
507	* are put to the addr field of the message structures.
508	* Then a LEAVE_INVITE is sent to both local daemon
509	* ports, 517 and 518. This is why we have two copies
510	* of the message, one in old talk and one in new talk
511	* format.
512	*/
513
514	if (type == ANNOUNCE) {
515	int s;
516	u_short temp_port;
517
518	for(req = req_tbl; req; req = req->next)
519	if (so == req->udp_so)
520	break; /* found it */
521
522	if (!req) { /* no entry for so, create new */
523	req = (struct talk_request *)
524	malloc(sizeof(struct talk_request));
525	req->udp_so = so;
526	req->tcp_so = solisten(0,
527	OTOSIN(omsg, addr)->sin_addr.s_addr,
528	OTOSIN(omsg, addr)->sin_port,
529	SS_FACCEPTONCE);
530	req->next = req_tbl;
531	req_tbl = req;
532	}
533
534	/* replace port number in addr field */
535	addrlen = sizeof(addr);
536	getsockname(req->tcp_so->s,
537	(struct sockaddr *) &addr,
538	&addrlen);
539	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
540	OTOSIN(omsg, addr)->sin_addr = our_addr;
541	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
542	OTOSIN(nmsg, addr)->sin_addr = our_addr;
543
544	/* send LEAVE_INVITEs */
545	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
546	OTOSIN(omsg, ctl_addr)->sin_port = 0;
547	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
548	omsg->type = nmsg->type = LEAVE_INVITE;
549
550	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
551	addr.sin_addr = our_addr;
552	addr.sin_family = AF_INET;
553	addr.sin_port = htons(517);
554	sendto(s, (char )omsg, sizeof(omsg), 0,
555	(struct sockaddr *)&addr, sizeof(addr));
556	addr.sin_port = htons(518);
557	sendto(s, (char )nmsg, sizeof(nmsg), 0,
558	(struct sockaddr *) &addr, sizeof(addr));
559	closesocket(s) ;
560
561	omsg->type = nmsg->type = ANNOUNCE;
562	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
563	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
564	}
565
566	/*
567	* If it is a DELETE message, we send a copy to the
568	* local daemons. Then we delete the entry corresponding
569	* to our socket from the request table.
570	*/
571
572	if (type == DELETE) {
573	struct talk_request temp_req, req_next;
574	int s;
575	u_short temp_port;
576
577	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
578	OTOSIN(omsg, ctl_addr)->sin_port = 0;
579	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
580
581	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
582	addr.sin_addr = our_addr;
583	addr.sin_family = AF_INET;
584	addr.sin_port = htons(517);
585	sendto(s, (char )omsg, sizeof(omsg), 0,
586	(struct sockaddr *)&addr, sizeof(addr));
587	addr.sin_port = htons(518);
588	sendto(s, (char )nmsg, sizeof(nmsg), 0,
589	(struct sockaddr *)&addr, sizeof(addr));
590	closesocket(s);
591
592	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
593	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
594
595	/* delete table entry */
596	if (so == req_tbl->udp_so) {
597	temp_req = req_tbl;
598	req_tbl = req_tbl->next;
599	free(temp_req);
600	} else {
601	temp_req = req_tbl;
602	for(req = req_tbl->next; req; req = req_next) {
603	req_next = req->next;
604	if (so == req->udp_so) {
605	temp_req->next = req_next;
606	free(req);
607	break;
608	} else {
609	temp_req = req;
610	}
611	}
612	}
613	}
614
615	return;
616	#endif
617
618	case EMU_CUSEEME:
619
620	/*
621	* Cu-SeeMe emulation.
622	* Hopefully the packet is more that 16 bytes long. We don't
623	* do any other tests, just replace the address and port
624	* fields.
625	*/
626	if (m->m_len >= sizeof (*cu_head)) {
627	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
628	return;
629	cu_head = mtod(m, struct cu_header *);
630	cu_head->s_port = addr.sin_port;
631	cu_head->so_addr = our_addr.s_addr;
632	}
633
634	return;
635	}
636	}
637
638	struct socket *
639	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
640	{
641	struct sockaddr_in addr;
642	struct socket *so;
643	socklen_t addrlen = sizeof(struct sockaddr_in);
644	int opt = 1;
645
646	if ((so = socreate()) == NULL) {
647	free(so);
648	return NULL;
649	}
650	so->s = socket(AF_INET,SOCK_DGRAM,0);
651	so->so_expire = curtime + SO_EXPIRE;
652	insque(pData, so,&udb);
653
654	addr.sin_family = AF_INET;
655	addr.sin_addr.s_addr = INADDR_ANY;
656	addr.sin_port = port;
657
658	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
659	udp_detach(pData, so);
660	return NULL;
661	}
662	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
663	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
664
665	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
666	so->so_fport = addr.sin_port;
667	/* The original check was completely broken, as the commented out
668	* if statement was always true (INADDR_ANY=0). */
669	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
670	if (1 == 0) /* always use the else part */
671	so->so_faddr = alias_addr;
672	else
673	so->so_faddr = addr.sin_addr;
674
675	so->so_lport = lport;
676	so->so_laddr.s_addr = laddr;
677	if (flags != SS_FACCEPTONCE)
678	so->so_expire = 0;
679
680	so->so_state = SS_ISFCONNECTED;
681
682	return so;
683	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 15232

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