udp.c@ 1016

Last change on this file since 1016 was 1010, checked in by vboxsync, 18 years ago
Disable built-in TFTP service in slirp. Needs to be configured properly before reenabling it.
Property svn:eol-style set to `native`
File size: 17.8 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	struct udpstat udpstat;
49
50	struct socket udb;
51
52	/*
53	* UDP protocol implementation.
54	* Per RFC 768, August, 1980.
55	*/
56	#ifndef COMPAT_42
57	int udpcksum = 1;
58	#else
59	int udpcksum = 0; /* XXX */
60	#endif
61
62	struct socket *udp_last_so = &udb;
63
64	void
65	udp_init()
66	{
67	udb.so_next = udb.so_prev = &udb;
68	}
69	/* m->m_data points at ip packet header
70	* m->m_len length ip packet
71	* ip->ip_len length data (IPDU)
72	*/
73	void
74	udp_input(m, iphlen)
75	register struct mbuf *m;
76	int iphlen;
77	{
78	register struct ip *ip;
79	register struct udphdr *uh;
80	/* struct mbuf opts = 0;/
81	int len;
82	struct ip save_ip;
83	struct socket *so;
84
85	DEBUG_CALL("udp_input");
86	DEBUG_ARG("m = %lx", (long)m);
87	DEBUG_ARG("iphlen = %d", iphlen);
88
89	udpstat.udps_ipackets++;
90
91	/*
92	* Strip IP options, if any; should skip this,
93	* make available to user, and use on returned packets,
94	* but we don't yet have a way to check the checksum
95	* with options still present.
96	*/
97	if(iphlen > sizeof(struct ip)) {
98	ip_stripoptions(m, (struct mbuf *)0);
99	iphlen = sizeof(struct ip);
100	}
101
102	/*
103	* Get IP and UDP header together in first mbuf.
104	*/
105	ip = mtod(m, struct ip *);
106	uh = (struct udphdr *)((caddr_t)ip + iphlen);
107
108	/*
109	* Make mbuf data length reflect UDP length.
110	* If not enough data to reflect UDP length, drop.
111	*/
112	len = ntohs((u_int16_t)uh->uh_ulen);
113
114	if (ip->ip_len != len) {
115	if (len > ip->ip_len) {
116	udpstat.udps_badlen++;
117	goto bad;
118	}
119	m_adj(m, len - ip->ip_len);
120	ip->ip_len = len;
121	}
122
123	/*
124	* Save a copy of the IP header in case we want restore it
125	* for sending an ICMP error message in response.
126	*/
127	save_ip = *ip;
128	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
129
130	/*
131	* Checksum extended UDP header and data.
132	*/
133	if (udpcksum && uh->uh_sum) {
134	((struct ipovly *)ip)->ih_next = 0;
135	((struct ipovly *)ip)->ih_prev = 0;
136	((struct ipovly *)ip)->ih_x1 = 0;
137	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
138	/* keep uh_sum for ICMP reply
139	* uh->uh_sum = cksum(m, len + sizeof (struct ip));
140	* if (uh->uh_sum) {
141	*/
142	if(cksum(m, len + sizeof(struct ip))) {
143	udpstat.udps_badsum++;
144	goto bad;
145	}
146	}
147
148	/*
149	* handle DHCP/BOOTP
150	*/
151	if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
152	bootp_input(m);
153	goto bad;
154	}
155
156	#ifndef VBOX
157	/* Disable this for now (security leak, allows the guest to read any file
158	* from the current directory and the directories in it on the host).
159	* Reenable it after adding a way to optionally configure the tftp root
160	* directory (the existing tftp prefix setting is not sufficient). */
161	/*
162	* handle TFTP
163	*/
164	if (ntohs(uh->uh_dport) == TFTP_SERVER) {
165	tftp_input(m);
166	goto bad;
167	}
168	#endif /* !VBOX */
169
170	/*
171	* Locate pcb for datagram.
172	*/
173	so = udp_last_so;
174	if (so->so_lport != uh->uh_sport \|\|
175	so->so_laddr.s_addr != ip->ip_src.s_addr) {
176	struct socket *tmp;
177
178	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
179	if (tmp->so_lport == uh->uh_sport &&
180	tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
181	#ifndef VBOX /* Move this further down, as it must be done also for the cache hit case. */
182	tmp->so_faddr.s_addr = ip->ip_dst.s_addr;
183	tmp->so_fport = uh->uh_dport;
184	#endif /* !VBOX */
185	so = tmp;
186	break;
187	}
188	}
189	if (tmp == &udb) {
190	so = NULL;
191	} else {
192	udpstat.udpps_pcbcachemiss++;
193	udp_last_so = so;
194	}
195	}
196
197	if (so == NULL) {
198	/*
199	* If there's no socket for this packet,
200	* create one
201	*/
202	if ((so = socreate()) == NULL) goto bad;
203	if(udp_attach(so) == -1) {
204	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
205	errno,strerror(errno)));
206	sofree(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(so, m);
238
239	if(sosendto(so,m) == -1) {
240	m->m_len += iphlen;
241	m->m_data -= iphlen;
242	*ip=save_ip;
243	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
244	icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
245	}
246
247	m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
248
249	/* restore the orig mbuf packet */
250	m->m_len += iphlen;
251	m->m_data -= iphlen;
252	*ip=save_ip;
253	so->so_m=m; /* ICMP backup */
254
255	return;
256	bad:
257	m_freem(m);
258	/* if (opts) m_freem(opts); */
259	return;
260	}
261
262	int udp_output2(struct socket so, struct mbuf m,
263	struct sockaddr_in saddr, struct sockaddr_in daddr,
264	int iptos)
265	{
266	register struct udpiphdr *ui;
267	int error = 0;
268
269	DEBUG_CALL("udp_output");
270	DEBUG_ARG("so = %lx", (long)so);
271	DEBUG_ARG("m = %lx", (long)m);
272	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
273	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
274
275	/*
276	* Adjust for header
277	*/
278	m->m_data -= sizeof(struct udpiphdr);
279	m->m_len += sizeof(struct udpiphdr);
280
281	/*
282	* Fill in mbuf with extended UDP header
283	* and addresses and length put into network format.
284	*/
285	ui = mtod(m, struct udpiphdr *);
286	ui->ui_next = ui->ui_prev = 0;
287	ui->ui_x1 = 0;
288	ui->ui_pr = IPPROTO_UDP;
289	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
290	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
291	ui->ui_src = saddr->sin_addr;
292	ui->ui_dst = daddr->sin_addr;
293	ui->ui_sport = saddr->sin_port;
294	ui->ui_dport = daddr->sin_port;
295	ui->ui_ulen = ui->ui_len;
296
297	/*
298	* Stuff checksum and output datagram.
299	*/
300	ui->ui_sum = 0;
301	if (udpcksum) {
302	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
303	ui->ui_sum = 0xffff;
304	}
305	((struct ip *)ui)->ip_len = m->m_len;
306
307	((struct ip *)ui)->ip_ttl = ip_defttl;
308	((struct ip *)ui)->ip_tos = iptos;
309
310	udpstat.udps_opackets++;
311
312	error = ip_output(so, m);
313
314	return (error);
315	}
316
317	int udp_output(struct socket so, struct mbuf m,
318	struct sockaddr_in *addr)
319
320	{
321	struct sockaddr_in saddr, daddr;
322
323	saddr = *addr;
324	if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
325	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
326	if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff))
327	saddr.sin_addr.s_addr = alias_addr.s_addr;
328	}
329	daddr.sin_addr = so->so_laddr;
330	daddr.sin_port = so->so_lport;
331
332	return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
333	}
334
335	int
336	udp_attach(so)
337	struct socket *so;
338	{
339	struct sockaddr_in addr;
340
341	if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
342	/*
343	* Here, we bind() the socket. Although not really needed
344	* (sendto() on an unbound socket will bind it), it's done
345	* here so that emulation of ytalk etc. don't have to do it
346	*/
347	addr.sin_family = AF_INET;
348	addr.sin_port = 0;
349	addr.sin_addr.s_addr = INADDR_ANY;
350	if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
351	int lasterrno=errno;
352	closesocket(so->s);
353	so->s=-1;
354	#ifdef _WIN32
355	WSASetLastError(lasterrno);
356	#else
357	errno=lasterrno;
358	#endif
359	} else {
360	/* success, insert in queue */
361	so->so_expire = curtime + SO_EXPIRE;
362	insque(so,&udb);
363	}
364	}
365	return(so->s);
366	}
367
368	void
369	udp_detach(so)
370	struct socket *so;
371	{
372	#ifdef VBOX
373	/* Correctly update list if detaching last socket in list. */
374	if (so == udp_last_so) udp_last_so = &udb;
375	#endif /* VBOX */
376	closesocket(so->s);
377	/* if (so->so_m) m_free(so->so_m); done by sofree */
378
379	sofree(so);
380	}
381
382	struct tos_t udptos[] = {
383	{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
384	{517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
385	{518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
386	{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
387	{0, 0, 0, 0}
388	};
389
390	u_int8_t
391	udp_tos(so)
392	struct socket *so;
393	{
394	int i = 0;
395
396	while(udptos[i].tos) {
397	if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) \|\|
398	(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
399	so->so_emu = udptos[i].emu;
400	return udptos[i].tos;
401	}
402	i++;
403	}
404
405	return 0;
406	}
407
408	#ifdef EMULATE_TALK
409	#include "talkd.h"
410	#endif
411
412	/*
413	* Here, talk/ytalk/ntalk requests must be emulated
414	*/
415	void
416	udp_emu(so, m)
417	struct socket *so;
418	struct mbuf *m;
419	{
420	struct sockaddr_in addr;
421	#ifndef VBOX
422	int addrlen = sizeof(addr);
423	#else /* VBOX */
424	socklen_t addrlen = sizeof(addr);
425	#endif /* VBOX */
426	#ifdef EMULATE_TALK
427	CTL_MSG_OLD *omsg;
428	CTL_MSG *nmsg;
429	char buff[sizeof(CTL_MSG)];
430	u_char type;
431
432	struct talk_request {
433	struct talk_request *next;
434	struct socket *udp_so;
435	struct socket *tcp_so;
436	} *req;
437
438	static struct talk_request *req_tbl = 0;
439
440	#endif
441
442	struct cu_header {
443	uint16_t d_family; /* destination family */
444	uint16_t d_port; /* destination port */
445	uint32_t d_addr; /* destination address */
446	uint16_t s_family; /* source family */
447	uint16_t s_port; /* source port */
448	uint32_t so_addr; /* source address */
449	uint32_t seqn; /* sequence number */
450	uint16_t message; /* message */
451	uint16_t data_type; /* data type */
452	uint16_t pkt_len; /* packet length */
453	} *cu_head;
454
455	switch(so->so_emu) {
456
457	#ifdef EMULATE_TALK
458	case EMU_TALK:
459	case EMU_NTALK:
460	/*
461	* Talk emulation. We always change the ctl_addr to get
462	* some answers from the daemon. When an ANNOUNCE comes,
463	* we send LEAVE_INVITE to the local daemons. Also when a
464	* DELETE comes, we send copies to the local daemons.
465	*/
466	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
467	return;
468
469	#define IS_OLD (so->so_emu == EMU_TALK)
470
471	#define COPY_MSG(dest, src) { dest->type = src->type; \
472	dest->id_num = src->id_num; \
473	dest->pid = src->pid; \
474	dest->addr = src->addr; \
475	dest->ctl_addr = src->ctl_addr; \
476	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
477	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
478	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
479
480	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
481	/* old_sockaddr to sockaddr_in */
482
483
484	if (IS_OLD) { /* old talk */
485	omsg = mtod(m, CTL_MSG_OLD*);
486	nmsg = (CTL_MSG *) buff;
487	type = omsg->type;
488	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
489	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
490	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
491	} else { /* new talk */
492	omsg = (CTL_MSG_OLD *) buff;
493	nmsg = mtod(m, CTL_MSG *);
494	type = nmsg->type;
495	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
496	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
497	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
498	}
499
500	if (type == LOOK_UP)
501	return; /* for LOOK_UP this is enough */
502
503	if (IS_OLD) { /* make a copy of the message */
504	COPY_MSG(nmsg, omsg);
505	nmsg->vers = 1;
506	nmsg->answer = 0;
507	} else
508	COPY_MSG(omsg, nmsg);
509
510	/*
511	* If if is an ANNOUNCE message, we go through the
512	* request table to see if a tcp port has already
513	* been redirected for this socket. If not, we solisten()
514	* a new socket and add this entry to the table.
515	* The port number of the tcp socket and our IP
516	* are put to the addr field of the message structures.
517	* Then a LEAVE_INVITE is sent to both local daemon
518	* ports, 517 and 518. This is why we have two copies
519	* of the message, one in old talk and one in new talk
520	* format.
521	*/
522
523	if (type == ANNOUNCE) {
524	int s;
525	u_short temp_port;
526
527	for(req = req_tbl; req; req = req->next)
528	if (so == req->udp_so)
529	break; /* found it */
530
531	if (!req) { /* no entry for so, create new */
532	req = (struct talk_request *)
533	malloc(sizeof(struct talk_request));
534	req->udp_so = so;
535	req->tcp_so = solisten(0,
536	OTOSIN(omsg, addr)->sin_addr.s_addr,
537	OTOSIN(omsg, addr)->sin_port,
538	SS_FACCEPTONCE);
539	req->next = req_tbl;
540	req_tbl = req;
541	}
542
543	/* replace port number in addr field */
544	addrlen = sizeof(addr);
545	getsockname(req->tcp_so->s,
546	(struct sockaddr *) &addr,
547	&addrlen);
548	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
549	OTOSIN(omsg, addr)->sin_addr = our_addr;
550	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
551	OTOSIN(nmsg, addr)->sin_addr = our_addr;
552
553	/* send LEAVE_INVITEs */
554	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
555	OTOSIN(omsg, ctl_addr)->sin_port = 0;
556	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
557	omsg->type = nmsg->type = LEAVE_INVITE;
558
559	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
560	addr.sin_addr = our_addr;
561	addr.sin_family = AF_INET;
562	addr.sin_port = htons(517);
563	sendto(s, (char )omsg, sizeof(omsg), 0,
564	(struct sockaddr *)&addr, sizeof(addr));
565	addr.sin_port = htons(518);
566	sendto(s, (char )nmsg, sizeof(nmsg), 0,
567	(struct sockaddr *) &addr, sizeof(addr));
568	closesocket(s) ;
569
570	omsg->type = nmsg->type = ANNOUNCE;
571	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
572	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
573	}
574
575	/*
576	* If it is a DELETE message, we send a copy to the
577	* local daemons. Then we delete the entry corresponding
578	* to our socket from the request table.
579	*/
580
581	if (type == DELETE) {
582	struct talk_request temp_req, req_next;
583	int s;
584	u_short temp_port;
585
586	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
587	OTOSIN(omsg, ctl_addr)->sin_port = 0;
588	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
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	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
602	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
603
604	/* delete table entry */
605	if (so == req_tbl->udp_so) {
606	temp_req = req_tbl;
607	req_tbl = req_tbl->next;
608	free(temp_req);
609	} else {
610	temp_req = req_tbl;
611	for(req = req_tbl->next; req; req = req_next) {
612	req_next = req->next;
613	if (so == req->udp_so) {
614	temp_req->next = req_next;
615	free(req);
616	break;
617	} else {
618	temp_req = req;
619	}
620	}
621	}
622	}
623
624	return;
625	#endif
626
627	case EMU_CUSEEME:
628
629	/*
630	* Cu-SeeMe emulation.
631	* Hopefully the packet is more that 16 bytes long. We don't
632	* do any other tests, just replace the address and port
633	* fields.
634	*/
635	if (m->m_len >= sizeof (*cu_head)) {
636	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
637	return;
638	cu_head = mtod(m, struct cu_header *);
639	cu_head->s_port = addr.sin_port;
640	cu_head->so_addr = our_addr.s_addr;
641	}
642
643	return;
644	}
645	}
646
647	struct socket *
648	udp_listen(port, laddr, lport, flags)
649	u_int port;
650	u_int32_t laddr;
651	u_int lport;
652	int flags;
653	{
654	struct sockaddr_in addr;
655	struct socket *so;
656	#ifndef VBOX
657	int addrlen = sizeof(struct sockaddr_in), opt = 1;
658	#else /* VBOX */
659	socklen_t addrlen = sizeof(struct sockaddr_in);
660	int opt = 1;
661	#endif /* VBOX */
662
663	if ((so = socreate()) == NULL) {
664	free(so);
665	return NULL;
666	}
667	so->s = socket(AF_INET,SOCK_DGRAM,0);
668	so->so_expire = curtime + SO_EXPIRE;
669	insque(so,&udb);
670
671	addr.sin_family = AF_INET;
672	addr.sin_addr.s_addr = INADDR_ANY;
673	addr.sin_port = port;
674
675	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
676	udp_detach(so);
677	return NULL;
678	}
679	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
680	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
681
682	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
683	so->so_fport = addr.sin_port;
684	if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr)
685	so->so_faddr = alias_addr;
686	else
687	so->so_faddr = addr.sin_addr;
688
689	so->so_lport = lport;
690	so->so_laddr.s_addr = laddr;
691	if (flags != SS_FACCEPTONCE)
692	so->so_expire = 0;
693
694	so->so_state = SS_ISFCONNECTED;
695
696	return so;
697	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 1016

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