udp.c@ 15453

Last change on this file since 15453 was 15453, checked in by vboxsync, 16 years ago
slirp: removed the old 64-bit incompatible reassemble code
Property svn:eol-style set to `native`
File size: 22.2 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	int len;
72	struct ip save_ip;
73	struct socket *so;
74	#ifdef VBOX_WITH_SLIRP_ICMP
75	int ret;
76	int ttl;
77	#endif
78
79	DEBUG_CALL("udp_input");
80	DEBUG_ARG("m = %lx", (long)m);
81	DEBUG_ARG("iphlen = %d", iphlen);
82
83	udpstat.udps_ipackets++;
84
85	/*
86	* Strip IP options, if any; should skip this,
87	* make available to user, and use on returned packets,
88	* but we don't yet have a way to check the checksum
89	* with options still present.
90	*/
91	if (iphlen > sizeof(struct ip))
92	{
93	ip_stripoptions(m, (struct mbuf *)0);
94	iphlen = sizeof(struct ip);
95	}
96
97	/*
98	* Get IP and UDP header together in first mbuf.
99	*/
100	ip = mtod(m, struct ip *);
101	uh = (struct udphdr *)((caddr_t)ip + iphlen);
102
103	/*
104	* Make mbuf data length reflect UDP length.
105	* If not enough data to reflect UDP length, drop.
106	*/
107	len = ntohs((u_int16_t)uh->uh_ulen);
108
109	if (ip->ip_len != len)
110	{
111	if (len > ip->ip_len)
112	{
113	udpstat.udps_badlen++;
114	goto bad;
115	}
116	m_adj(m, len - ip->ip_len);
117	ip->ip_len = len;
118	}
119
120	/*
121	* Save a copy of the IP header in case we want restore it
122	* for sending an ICMP error message in response.
123	*/
124	save_ip = *ip;
125	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
126
127	/*
128	* Checksum extended UDP header and data.
129	*/
130	if (udpcksum && uh->uh_sum)
131	{
132	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
133	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
134	#if 0
135	/* keep uh_sum for ICMP reply */
136	uh->uh_sum = cksum(m, len + sizeof (struct ip));
137	if (uh->uh_sum)
138	{
139
140	#endif
141	if(cksum(m, len + sizeof(struct ip)))
142	{
143	udpstat.udps_badsum++;
144	goto bad;
145	}
146	}
147	#if 0
148	}
149	#endif
150
151	/*
152	* handle DHCP/BOOTP
153	*/
154	if (ntohs(uh->uh_dport) == BOOTP_SERVER)
155	{
156	bootp_input(pData, m);
157	goto bad;
158	}
159
160	/*
161	* handle TFTP
162	*/
163	if (ntohs(uh->uh_dport) == TFTP_SERVER)
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	#ifdef VBOX_WITH_SLIRP_ICMP
242	ttl = ip->ip_ttl = save_ip.ip_ttl;
243	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
244	if (ret < 0) {
245	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
246	}
247	#endif
248	if(sosendto(pData, so,m) == -1)
249	{
250	m->m_len += iphlen;
251	m->m_data -= iphlen;
252	*ip = save_ip;
253	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
254	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
255	}
256
257	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
258
259	/* restore the orig mbuf packet */
260	m->m_len += iphlen;
261	m->m_data -= iphlen;
262	*ip = save_ip;
263	so->so_m = m; /* ICMP backup */
264
265	return;
266
267	bad:
268	m_freem(pData, m);
269	return;
270	}
271
272	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
273	struct sockaddr_in saddr, struct sockaddr_in daddr,
274	int iptos)
275	{
276	register struct udpiphdr *ui;
277	int error = 0;
278
279	DEBUG_CALL("udp_output");
280	DEBUG_ARG("so = %lx", (long)so);
281	DEBUG_ARG("m = %lx", (long)m);
282	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
283	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
284
285	/*
286	* Adjust for header
287	*/
288	m->m_data -= sizeof(struct udpiphdr);
289	m->m_len += sizeof(struct udpiphdr);
290
291	/*
292	* Fill in mbuf with extended UDP header
293	* and addresses and length put into network format.
294	*/
295	ui = mtod(m, struct udpiphdr *);
296	memset(ui->ui_x1, 0, 9);
297	ui->ui_pr = IPPROTO_UDP;
298	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
299	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
300	ui->ui_src = saddr->sin_addr;
301	ui->ui_dst = daddr->sin_addr;
302	ui->ui_sport = saddr->sin_port;
303	ui->ui_dport = daddr->sin_port;
304	ui->ui_ulen = ui->ui_len;
305
306	/*
307	* Stuff checksum and output datagram.
308	*/
309	ui->ui_sum = 0;
310	if (udpcksum)
311	{
312	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
313	ui->ui_sum = 0xffff;
314	}
315	((struct ip *)ui)->ip_len = m->m_len;
316	((struct ip *)ui)->ip_ttl = ip_defttl;
317	((struct ip *)ui)->ip_tos = iptos;
318
319	udpstat.udps_opackets++;
320
321	error = ip_output(pData, so, m);
322
323	return error;
324	}
325
326	int udp_output(PNATState pData, struct socket so, struct mbuf m,
327	struct sockaddr_in *addr)
328	{
329	struct sockaddr_in saddr, daddr;
330
331	saddr = *addr;
332	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
333	{
334	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
335	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
336	saddr.sin_addr.s_addr = alias_addr.s_addr;
337	}
338
339	/* Any UDP packet to the loopback address must be translated to be from
340	* the forwarding address, i.e. 10.0.2.2. */
341	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
342	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
343	saddr.sin_addr.s_addr = alias_addr.s_addr;
344
345	daddr.sin_addr = so->so_laddr;
346	daddr.sin_port = so->so_lport;
347
348	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
349	}
350
351	int
352	udp_attach(PNATState pData, struct socket *so)
353	{
354	struct sockaddr_in addr;
355	#ifdef VBOX_WITH_SLIRP_ICMP
356	struct sockaddr sa_addr;
357	socklen_t socklen = sizeof(struct sockaddr);
358	int status;
359	#endif
360
361	if ((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1)
362	{
363	/*
364	* Here, we bind() the socket. Although not really needed
365	* (sendto() on an unbound socket will bind it), it's done
366	* here so that emulation of ytalk etc. don't have to do it
367	*/
368	addr.sin_family = AF_INET;
369	addr.sin_port = 0;
370	addr.sin_addr.s_addr = INADDR_ANY;
371	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
372	{
373	int lasterrno = errno;
374	closesocket(so->s);
375	so->s = -1;
376	#ifdef RT_OS_WINDOWS
377	WSASetLastError(lasterrno);
378	#else
379	errno = lasterrno;
380	#endif
381	}
382	else
383	{
384	int opt = 1;
385	/* success, insert in queue */
386	so->so_expire = curtime + SO_EXPIRE;
387	/* enable broadcast for later use */
388	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
389	insque(pData, so,&udb);
390	#ifdef VBOX_WITH_SLIRP_ICMP
391	status = getsockname(so->s, &sa_addr, &socklen);
392	Assert(status == 0 && sa_addr.sa_family == AF_INET);
393	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
394	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
395	#endif
396	}
397	}
398	return so->s;
399	}
400
401	void
402	udp_detach(PNATState pData, struct socket *so)
403	{
404	#ifndef VBOX_WITH_SLIRP_ICMP
405	closesocket(so->s);
406	sofree(pData, so);
407	#else /! VBOX_WITH_SLIRP_ICMP /
408	if (so != &pData->icmp_socket)
409	{
410	closesocket(so->s);
411	sofree(pData, so);
412	}
413	#endif /* VBOX_WITH_SLIRP_ICMP */
414	}
415
416	static const struct tos_t udptos[] =
417	{
418	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
419	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
420	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
421	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
422	{ 0, 0, 0, 0 }
423	};
424
425	u_int8_t
426	udp_tos(struct socket *so)
427	{
428	int i = 0;
429
430	while(udptos[i].tos)
431	{
432	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
433	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
434	{
435	so->so_emu = udptos[i].emu;
436	return udptos[i].tos;
437	}
438	i++;
439	}
440
441	return 0;
442	}
443
444	#ifdef EMULATE_TALK
445	#include "talkd.h"
446	#endif
447
448	/*
449	* Here, talk/ytalk/ntalk requests must be emulated
450	*/
451	void
452	udp_emu(PNATState pData, struct socket so, struct mbuf m)
453	{
454	struct sockaddr_in addr;
455	socklen_t addrlen = sizeof(addr);
456	#ifdef EMULATE_TALK
457	CTL_MSG_OLD *omsg;
458	CTL_MSG *nmsg;
459	char buff[sizeof(CTL_MSG)];
460	u_char type;
461
462	struct talk_request
463	{
464	struct talk_request *next;
465	struct socket *udp_so;
466	struct socket *tcp_so;
467	} *req;
468
469	static struct talk_request *req_tbl = 0;
470
471	#endif
472
473	struct cu_header
474	{
475	uint16_t d_family; /* destination family */
476	uint16_t d_port; /* destination port */
477	uint32_t d_addr; /* destination address */
478	uint16_t s_family; /* source family */
479	uint16_t s_port; /* source port */
480	uint32_t so_addr; /* source address */
481	uint32_t seqn; /* sequence number */
482	uint16_t message; /* message */
483	uint16_t data_type; /* data type */
484	uint16_t pkt_len; /* packet length */
485	} *cu_head;
486
487	switch(so->so_emu)
488	{
489	#ifdef EMULATE_TALK
490	case EMU_TALK:
491	case EMU_NTALK:
492	/*
493	* Talk emulation. We always change the ctl_addr to get
494	* some answers from the daemon. When an ANNOUNCE comes,
495	* we send LEAVE_INVITE to the local daemons. Also when a
496	* DELETE comes, we send copies to the local daemons.
497	*/
498	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
499	return;
500
501	#define IS_OLD (so->so_emu == EMU_TALK)
502
503	#define COPY_MSG(dest, src) \
504	do { \
505	dest->type = src->type; \
506	dest->id_num = src->id_num; \
507	dest->pid = src->pid; \
508	dest->addr = src->addr; \
509	dest->ctl_addr = src->ctl_addr; \
510	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
511	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
512	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
513	} while (0)
514
515	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
516	/* old_sockaddr to sockaddr_in */
517
518
519	if (IS_OLD)
520	{
521	/* old talk */
522	omsg = mtod(m, CTL_MSG_OLD*);
523	nmsg = (CTL_MSG *) buff;
524	type = omsg->type;
525	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
526	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
527	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
528	}
529	else
530	{
531	/* new talk */
532	omsg = (CTL_MSG_OLD *) buff;
533	nmsg = mtod(m, CTL_MSG *);
534	type = nmsg->type;
535	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
536	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
537	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
538	}
539
540	if (type == LOOK_UP)
541	return; /* for LOOK_UP this is enough */
542
543	if (IS_OLD)
544	{
545	/* make a copy of the message */
546	COPY_MSG(nmsg, omsg);
547	nmsg->vers = 1;
548	nmsg->answer = 0;
549	}
550	else
551	COPY_MSG(omsg, nmsg);
552
553	/*
554	* If if is an ANNOUNCE message, we go through the
555	* request table to see if a tcp port has already
556	* been redirected for this socket. If not, we solisten()
557	* a new socket and add this entry to the table.
558	* The port number of the tcp socket and our IP
559	* are put to the addr field of the message structures.
560	* Then a LEAVE_INVITE is sent to both local daemon
561	* ports, 517 and 518. This is why we have two copies
562	* of the message, one in old talk and one in new talk
563	* format.
564	*/
565
566	if (type == ANNOUNCE)
567	{
568	int s;
569	u_short temp_port;
570
571	for(req = req_tbl; req; req = req->next)
572	if (so == req->udp_so)
573	break; /* found it */
574
575	if (!req)
576	{
577	/* no entry for so, create new */
578	req = (struct talk_request *)malloc(sizeof(struct talk_request));
579	req->udp_so = so;
580	req->tcp_so = solisten(0,
581	OTOSIN(omsg, addr)->sin_addr.s_addr,
582	OTOSIN(omsg, addr)->sin_port,
583	SS_FACCEPTONCE);
584	req->next = req_tbl;
585	req_tbl = req;
586	}
587
588	/* replace port number in addr field */
589	addrlen = sizeof(addr);
590	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
591	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
592	OTOSIN(omsg, addr)->sin_addr = our_addr;
593	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
594	OTOSIN(nmsg, addr)->sin_addr = our_addr;
595
596	/* send LEAVE_INVITEs */
597	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
598	OTOSIN(omsg, ctl_addr)->sin_port = 0;
599	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
600	omsg->type = nmsg->type = LEAVE_INVITE;
601
602	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
603	addr.sin_addr = our_addr;
604	addr.sin_family = AF_INET;
605	addr.sin_port = htons(517);
606	sendto(s, (char )omsg, sizeof(omsg), 0,
607	(struct sockaddr *)&addr, sizeof(addr));
608	addr.sin_port = htons(518);
609	sendto(s, (char )nmsg, sizeof(nmsg), 0,
610	(struct sockaddr *) &addr, sizeof(addr));
611	closesocket(s) ;
612
613	omsg->type = nmsg->type = ANNOUNCE;
614	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
615	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
616	}
617
618	/*
619	* If it is a DELETE message, we send a copy to the
620	* local daemons. Then we delete the entry corresponding
621	* to our socket from the request table.
622	*/
623
624	if (type == DELETE)
625	{
626	struct talk_request temp_req, req_next;
627	int s;
628	u_short temp_port;
629
630	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
631	OTOSIN(omsg, ctl_addr)->sin_port = 0;
632	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
633
634	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
635	addr.sin_addr = our_addr;
636	addr.sin_family = AF_INET;
637	addr.sin_port = htons(517);
638	sendto(s, (char )omsg, sizeof(omsg), 0,
639	(struct sockaddr *)&addr, sizeof(addr));
640	addr.sin_port = htons(518);
641	sendto(s, (char )nmsg, sizeof(nmsg), 0,
642	(struct sockaddr *)&addr, sizeof(addr));
643	closesocket(s);
644
645	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
646	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
647
648	/* delete table entry */
649	if (so == req_tbl->udp_so)
650	{
651	temp_req = req_tbl;
652	req_tbl = req_tbl->next;
653	free(temp_req);
654	}
655	else
656	{
657	temp_req = req_tbl;
658	for (req = req_tbl->next; req; req = req_next)
659	{
660	req_next = req->next;
661	if (so == req->udp_so)
662	{
663	temp_req->next = req_next;
664	free(req);
665	break;
666	}
667	else
668	temp_req = req;
669	}
670	}
671	}
672
673	return;
674	#endif
675
676	case EMU_CUSEEME:
677	/*
678	* Cu-SeeMe emulation.
679	* Hopefully the packet is more that 16 bytes long. We don't
680	* do any other tests, just replace the address and port
681	* fields.
682	*/
683	if (m->m_len >= sizeof (*cu_head))
684	{
685	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
686	return;
687	cu_head = mtod(m, struct cu_header *);
688	cu_head->s_port = addr.sin_port;
689	cu_head->so_addr = our_addr.s_addr;
690	}
691	return;
692	}
693	}
694
695	struct socket *
696	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
697	{
698	struct sockaddr_in addr;
699	struct socket *so;
700	socklen_t addrlen = sizeof(struct sockaddr_in);
701	int opt = 1;
702
703	if ((so = socreate()) == NULL)
704	return NULL;
705
706	so->s = socket(AF_INET,SOCK_DGRAM,0);
707	so->so_expire = curtime + SO_EXPIRE;
708	insque(pData, so,&udb);
709
710	addr.sin_family = AF_INET;
711	addr.sin_addr.s_addr = INADDR_ANY;
712	addr.sin_port = port;
713
714	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
715	{
716	udp_detach(pData, so);
717	return NULL;
718	}
719	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
720	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
721
722	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
723	so->so_fport = addr.sin_port;
724	/* The original check was completely broken, as the commented out
725	* if statement was always true (INADDR_ANY=0). */
726	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
727	if (1 == 0) /* always use the else part */
728	so->so_faddr = alias_addr;
729	else
730	so->so_faddr = addr.sin_addr;
731
732	so->so_lport = lport;
733	so->so_laddr.s_addr = laddr;
734	if (flags != SS_FACCEPTONCE)
735	so->so_expire = 0;
736
737	so->so_state = SS_ISFCONNECTED;
738
739	return so;
740	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 15453

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