udp.c@ 17224

Last change on this file since 17224 was 17191, 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	#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, slirp_get_service(IPPROTO_UDP, uh->uh_dport, uh->uh_sport)) == -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	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
255	so->so_m = NULL;
256	}
257
258	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
259
260	/* restore the orig mbuf packet */
261	m->m_len += iphlen;
262	m->m_data -= iphlen;
263	*ip = save_ip;
264	so->so_m = m; /* ICMP backup */
265
266	return;
267
268	bad:
269	m_freem(pData, m);
270	return;
271	}
272
273	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
274	struct sockaddr_in saddr, struct sockaddr_in daddr,
275	int iptos)
276	{
277	register struct udpiphdr *ui;
278	int error = 0;
279
280	DEBUG_CALL("udp_output");
281	DEBUG_ARG("so = %lx", (long)so);
282	DEBUG_ARG("m = %lx", (long)m);
283	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
284	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
285
286	/*
287	* Adjust for header
288	*/
289	m->m_data -= sizeof(struct udpiphdr);
290	m->m_len += sizeof(struct udpiphdr);
291
292	/*
293	* Fill in mbuf with extended UDP header
294	* and addresses and length put into network format.
295	*/
296	ui = mtod(m, struct udpiphdr *);
297	memset(ui->ui_x1, 0, 9);
298	ui->ui_pr = IPPROTO_UDP;
299	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
300	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
301	ui->ui_src = saddr->sin_addr;
302	ui->ui_dst = daddr->sin_addr;
303	ui->ui_sport = saddr->sin_port;
304	ui->ui_dport = daddr->sin_port;
305	ui->ui_ulen = ui->ui_len;
306
307	/*
308	* Stuff checksum and output datagram.
309	*/
310	ui->ui_sum = 0;
311	if (udpcksum)
312	{
313	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
314	ui->ui_sum = 0xffff;
315	}
316	((struct ip *)ui)->ip_len = m->m_len;
317	((struct ip *)ui)->ip_ttl = ip_defttl;
318	((struct ip *)ui)->ip_tos = iptos;
319
320	udpstat.udps_opackets++;
321
322	error = ip_output(pData, so, m);
323
324	return error;
325	}
326
327	int udp_output(PNATState pData, struct socket so, struct mbuf m,
328	struct sockaddr_in *addr)
329	{
330	struct sockaddr_in saddr, daddr;
331
332	saddr = *addr;
333	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
334	{
335	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
336	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
337	saddr.sin_addr.s_addr = alias_addr.s_addr;
338	}
339
340	/* Any UDP packet to the loopback address must be translated to be from
341	* the forwarding address, i.e. 10.0.2.2. */
342	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
343	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
344	saddr.sin_addr.s_addr = alias_addr.s_addr;
345
346	daddr.sin_addr = so->so_laddr;
347	daddr.sin_port = so->so_lport;
348
349	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
350	}
351
352	int
353	udp_attach(PNATState pData, struct socket *so, int service_port)
354	{
355	struct sockaddr_in addr;
356	struct sockaddr sa_addr;
357	socklen_t socklen = sizeof(struct sockaddr);
358	int status;
359
360	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) != -1)
361	{
362	/*
363	* Here, we bind() the socket. Although not really needed
364	* (sendto() on an unbound socket will bind it), it's done
365	* here so that emulation of ytalk etc. don't have to do it
366	*/
367	addr.sin_family = AF_INET;
368	addr.sin_port = service_port;
369	addr.sin_addr.s_addr = INADDR_ANY;
370	fd_nonblock(so->s);
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	status = getsockname(so->s, &sa_addr, &socklen);
390	Assert(status == 0 && sa_addr.sa_family == AF_INET);
391	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
392	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
393	SOCKET_LOCK_CREATE(so);
394	QSOCKET_LOCK(udb);
395	insque(pData, so,&udb);
396	NSOCK_INC();
397	QSOCKET_UNLOCK(udb);
398	}
399	}
400	else
401	{
402	LogRel(("NAT: can't create datagramm socket\n"));
403	}
404	return so->s;
405	}
406
407	void
408	udp_detach(PNATState pData, struct socket *so)
409	{
410	if (so != &pData->icmp_socket)
411	{
412	QSOCKET_LOCK(udb);
413	SOCKET_LOCK(so);
414	QSOCKET_UNLOCK(udb);
415	closesocket(so->s);
416	sofree(pData, so);
417	SOCKET_UNLOCK(so);
418	}
419	}
420
421	static const struct tos_t udptos[] =
422	{
423	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
424	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
425	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
426	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
427	{ 0, 0, 0, 0 }
428	};
429
430	u_int8_t
431	udp_tos(struct socket *so)
432	{
433	int i = 0;
434
435	while(udptos[i].tos)
436	{
437	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
438	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
439	{
440	so->so_emu = udptos[i].emu;
441	return udptos[i].tos;
442	}
443	i++;
444	}
445
446	return 0;
447	}
448
449	#ifdef EMULATE_TALK
450	#include "talkd.h"
451	#endif
452
453	/*
454	* Here, talk/ytalk/ntalk requests must be emulated
455	*/
456	void
457	udp_emu(PNATState pData, struct socket so, struct mbuf m)
458	{
459	struct sockaddr_in addr;
460	socklen_t addrlen = sizeof(addr);
461	#ifdef EMULATE_TALK
462	CTL_MSG_OLD *omsg;
463	CTL_MSG *nmsg;
464	char buff[sizeof(CTL_MSG)];
465	u_char type;
466
467	struct talk_request
468	{
469	struct talk_request *next;
470	struct socket *udp_so;
471	struct socket *tcp_so;
472	} *req;
473
474	static struct talk_request *req_tbl = 0;
475
476	#endif
477
478	struct cu_header
479	{
480	uint16_t d_family; /* destination family */
481	uint16_t d_port; /* destination port */
482	uint32_t d_addr; /* destination address */
483	uint16_t s_family; /* source family */
484	uint16_t s_port; /* source port */
485	uint32_t so_addr; /* source address */
486	uint32_t seqn; /* sequence number */
487	uint16_t message; /* message */
488	uint16_t data_type; /* data type */
489	uint16_t pkt_len; /* packet length */
490	} *cu_head;
491
492	switch(so->so_emu)
493	{
494	#ifdef EMULATE_TALK
495	case EMU_TALK:
496	case EMU_NTALK:
497	/*
498	* Talk emulation. We always change the ctl_addr to get
499	* some answers from the daemon. When an ANNOUNCE comes,
500	* we send LEAVE_INVITE to the local daemons. Also when a
501	* DELETE comes, we send copies to the local daemons.
502	*/
503	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
504	return;
505
506	#define IS_OLD (so->so_emu == EMU_TALK)
507
508	#define COPY_MSG(dest, src) \
509	do { \
510	dest->type = src->type; \
511	dest->id_num = src->id_num; \
512	dest->pid = src->pid; \
513	dest->addr = src->addr; \
514	dest->ctl_addr = src->ctl_addr; \
515	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
516	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
517	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
518	} while (0)
519
520	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
521	/* old_sockaddr to sockaddr_in */
522
523
524	if (IS_OLD)
525	{
526	/* old talk */
527	omsg = mtod(m, CTL_MSG_OLD*);
528	nmsg = (CTL_MSG *) buff;
529	type = omsg->type;
530	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
531	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
532	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
533	}
534	else
535	{
536	/* new talk */
537	omsg = (CTL_MSG_OLD *) buff;
538	nmsg = mtod(m, CTL_MSG *);
539	type = nmsg->type;
540	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
541	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
542	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
543	}
544
545	if (type == LOOK_UP)
546	return; /* for LOOK_UP this is enough */
547
548	if (IS_OLD)
549	{
550	/* make a copy of the message */
551	COPY_MSG(nmsg, omsg);
552	nmsg->vers = 1;
553	nmsg->answer = 0;
554	}
555	else
556	COPY_MSG(omsg, nmsg);
557
558	/*
559	* If if is an ANNOUNCE message, we go through the
560	* request table to see if a tcp port has already
561	* been redirected for this socket. If not, we solisten()
562	* a new socket and add this entry to the table.
563	* The port number of the tcp socket and our IP
564	* are put to the addr field of the message structures.
565	* Then a LEAVE_INVITE is sent to both local daemon
566	* ports, 517 and 518. This is why we have two copies
567	* of the message, one in old talk and one in new talk
568	* format.
569	*/
570
571	if (type == ANNOUNCE)
572	{
573	int s;
574	u_short temp_port;
575
576	for(req = req_tbl; req; req = req->next)
577	if (so == req->udp_so)
578	break; /* found it */
579
580	if (!req)
581	{
582	/* no entry for so, create new */
583	req = (struct talk_request *)RTMemAlloc(sizeof(struct talk_request));
584	req->udp_so = so;
585	req->tcp_so = solisten(0,
586	OTOSIN(omsg, addr)->sin_addr.s_addr,
587	OTOSIN(omsg, addr)->sin_port,
588	SS_FACCEPTONCE);
589	req->next = req_tbl;
590	req_tbl = req;
591	}
592
593	/* replace port number in addr field */
594	addrlen = sizeof(addr);
595	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
596	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
597	OTOSIN(omsg, addr)->sin_addr = our_addr;
598	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
599	OTOSIN(nmsg, addr)->sin_addr = our_addr;
600
601	/* send LEAVE_INVITEs */
602	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
603	OTOSIN(omsg, ctl_addr)->sin_port = 0;
604	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
605	omsg->type = nmsg->type = LEAVE_INVITE;
606
607	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
608	addr.sin_addr = our_addr;
609	addr.sin_family = AF_INET;
610	addr.sin_port = htons(517);
611	sendto(s, (char )omsg, sizeof(omsg), 0,
612	(struct sockaddr *)&addr, sizeof(addr));
613	addr.sin_port = htons(518);
614	sendto(s, (char )nmsg, sizeof(nmsg), 0,
615	(struct sockaddr *) &addr, sizeof(addr));
616	closesocket(s) ;
617
618	omsg->type = nmsg->type = ANNOUNCE;
619	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
620	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
621	}
622
623	/*
624	* If it is a DELETE message, we send a copy to the
625	* local daemons. Then we delete the entry corresponding
626	* to our socket from the request table.
627	*/
628
629	if (type == DELETE)
630	{
631	struct talk_request temp_req, req_next;
632	int s;
633	u_short temp_port;
634
635	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
636	OTOSIN(omsg, ctl_addr)->sin_port = 0;
637	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
638
639	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
640	addr.sin_addr = our_addr;
641	addr.sin_family = AF_INET;
642	addr.sin_port = htons(517);
643	sendto(s, (char )omsg, sizeof(omsg), 0,
644	(struct sockaddr *)&addr, sizeof(addr));
645	addr.sin_port = htons(518);
646	sendto(s, (char )nmsg, sizeof(nmsg), 0,
647	(struct sockaddr *)&addr, sizeof(addr));
648	closesocket(s);
649
650	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
651	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
652
653	/* delete table entry */
654	if (so == req_tbl->udp_so)
655	{
656	temp_req = req_tbl;
657	req_tbl = req_tbl->next;
658	RTMemFree(temp_req);
659	}
660	else
661	{
662	temp_req = req_tbl;
663	for (req = req_tbl->next; req; req = req_next)
664	{
665	req_next = req->next;
666	if (so == req->udp_so)
667	{
668	temp_req->next = req_next;
669	RTMemFree(req);
670	break;
671	}
672	else
673	temp_req = req;
674	}
675	}
676	}
677
678	return;
679	#endif
680
681	case EMU_CUSEEME:
682	/*
683	* Cu-SeeMe emulation.
684	* Hopefully the packet is more that 16 bytes long. We don't
685	* do any other tests, just replace the address and port
686	* fields.
687	*/
688	if (m->m_len >= sizeof (*cu_head))
689	{
690	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
691	return;
692	cu_head = mtod(m, struct cu_header *);
693	cu_head->s_port = addr.sin_port;
694	cu_head->so_addr = our_addr.s_addr;
695	}
696	return;
697	}
698	}
699
700	struct socket *
701	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
702	{
703	struct sockaddr_in addr;
704	struct socket *so;
705	socklen_t addrlen = sizeof(struct sockaddr_in);
706	int opt = 1;
707
708	if ((so = socreate()) == NULL)
709	return NULL;
710
711	so->s = socket(AF_INET, SOCK_DGRAM, 0);
712	if (so->s == -1)
713	{
714	LogRel(("NAT: can't create datagram socket\n"));
715	RTMemFree(so);
716	return NULL;
717	}
718	so->so_expire = curtime + SO_EXPIRE;
719	fd_nonblock(so->s);
720	SOCKET_LOCK_CREATE(so);
721	QSOCKET_LOCK(udb);
722	insque(pData, so,&udb);
723	NSOCK_INC();
724	QSOCKET_UNLOCK(udb);
725
726	addr.sin_family = AF_INET;
727	addr.sin_addr.s_addr = INADDR_ANY;
728	addr.sin_port = port;
729
730	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
731	{
732	udp_detach(pData, so);
733	return NULL;
734	}
735	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
736	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
737
738	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
739	so->so_fport = addr.sin_port;
740	/* The original check was completely broken, as the commented out
741	* if statement was always true (INADDR_ANY=0). */
742	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
743	if (1 == 0) /* always use the else part */
744	so->so_faddr = alias_addr;
745	else
746	so->so_faddr = addr.sin_addr;
747
748	so->so_lport = lport;
749	so->so_laddr.s_addr = laddr;
750	if (flags != SS_FACCEPTONCE)
751	so->so_expire = 0;
752
753	so->so_state = SS_ISFCONNECTED;
754
755	return so;
756	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 17224

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