udp.c@ 21610

Last change on this file since 21610 was 21049, checked in by vboxsync, 16 years ago
NAT: BSD(darwin) specifics of binding
Property svn:eol-style set to `native`
File size: 23.8 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	#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	ip = mtod(m, struct ip *);
81	DEBUG_ARG("iphlen = %d", iphlen);
82	Log2(("%R[IP4] iphlen = %d\n", &ip->ip_dst, iphlen));
83
84	udpstat.udps_ipackets++;
85
86	/*
87	* Strip IP options, if any; should skip this,
88	* make available to user, and use on returned packets,
89	* but we don't yet have a way to check the checksum
90	* with options still present.
91	*/
92	if (iphlen > sizeof(struct ip))
93	{
94	ip_stripoptions(m, (struct mbuf *)0);
95	iphlen = sizeof(struct ip);
96	}
97
98	/*
99	* Get IP and UDP header together in first mbuf.
100	*/
101	ip = mtod(m, struct ip *);
102	uh = (struct udphdr *)((caddr_t)ip + iphlen);
103
104	/*
105	* Make mbuf data length reflect UDP length.
106	* If not enough data to reflect UDP length, drop.
107	*/
108	len = ntohs((u_int16_t)uh->uh_ulen);
109
110	if (ip->ip_len != len)
111	{
112	if (len > ip->ip_len)
113	{
114	udpstat.udps_badlen++;
115	goto bad;
116	}
117	m_adj(m, len - ip->ip_len);
118	ip->ip_len = len;
119	}
120
121	/*
122	* Save a copy of the IP header in case we want restore it
123	* for sending an ICMP error message in response.
124	*/
125	save_ip = *ip;
126	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
127
128	/*
129	* Checksum extended UDP header and data.
130	*/
131	if (udpcksum && uh->uh_sum)
132	{
133	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
134	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
135	#if 0
136	/* keep uh_sum for ICMP reply */
137	uh->uh_sum = cksum(m, len + sizeof (struct ip));
138	if (uh->uh_sum)
139	{
140
141	#endif
142	if(cksum(m, len + sizeof(struct ip)))
143	{
144	udpstat.udps_badsum++;
145	goto bad;
146	}
147	}
148	#if 0
149	}
150	#endif
151
152	/*
153	* handle DHCP/BOOTP
154	*/
155	if (ntohs(uh->uh_dport) == BOOTP_SERVER)
156	{
157	bootp_input(pData, m);
158	goto bad;
159	}
160
161	/*
162	* handle TFTP
163	*/
164	if ( ntohs(uh->uh_dport) == TFTP_SERVER
165	&& CTL_CHECK(ntohl(ip->ip_dst.s_addr), CTL_TFTP))
166	{
167	tftp_input(pData, m);
168	goto bad;
169	}
170
171	/*
172	* Locate pcb for datagram.
173	*/
174	so = udp_last_so;
175	if ( so->so_lport != uh->uh_sport
176	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
177	{
178	struct socket *tmp;
179
180	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
181	{
182	if ( tmp->so_lport == uh->uh_sport
183	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
184	{
185	so = tmp;
186	break;
187	}
188	}
189	if (tmp == &udb)
190	so = NULL;
191	else
192	{
193	udpstat.udpps_pcbcachemiss++;
194	udp_last_so = so;
195	}
196	}
197
198	if (so == NULL)
199	{
200	/*
201	* If there's no socket for this packet,
202	* create one
203	*/
204	if ((so = socreate()) == NULL)
205	goto bad;
206	if (udp_attach(pData, so, slirp_get_service(IPPROTO_UDP, uh->uh_dport, uh->uh_sport)) == -1)
207	{
208	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
209	errno, strerror(errno)));
210	sofree(pData, so);
211	goto bad;
212	}
213
214	/*
215	* Setup fields
216	*/
217	/* udp_last_so = so; */
218	so->so_laddr = ip->ip_src;
219	so->so_lport = uh->uh_sport;
220
221	if ((so->so_iptos = udp_tos(so)) == 0)
222	so->so_iptos = ip->ip_tos;
223
224	/*
225	* XXXXX Here, check if it's in udpexec_list,
226	* and if it is, do the fork_exec() etc.
227	*/
228	}
229
230	so->so_faddr = ip->ip_dst; /* XXX */
231	so->so_fport = uh->uh_dport; /* XXX */
232
233	/*
234	* DNS proxy
235	*/
236	if ( (ip->ip_dst.s_addr == htonl(ntohl(special_addr.s_addr) \| CTL_DNS))
237	&& (ntohs(uh->uh_dport) == 53))
238	{
239	dnsproxy_query(pData, so, m, iphlen);
240	goto bad; /* it isn't bad, probably better to add additional label done for boot/tftf :) */
241	}
242
243	iphlen += sizeof(struct udphdr);
244	m->m_len -= iphlen;
245	m->m_data += iphlen;
246
247	/*
248	* Now we sendto() the packet.
249	*/
250	if (so->so_emu)
251	udp_emu(pData, so, m);
252
253	ttl = ip->ip_ttl = save_ip.ip_ttl;
254	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
255	if (ret < 0)
256	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
257	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
258
259	if (sosendto(pData, so, m) == -1)
260	{
261	m->m_len += iphlen;
262	m->m_data -= iphlen;
263	*ip = save_ip;
264	DEBUG_MISC((dfd,"NAT: UDP tx errno = %d-%s (on sent to %R[IP4])\n", errno,
265	strerror(errno), &ip->ip_dst));
266	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
267	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
268	so->so_m = NULL;
269	}
270
271	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
272
273	/* restore the orig mbuf packet */
274	m->m_len += iphlen;
275	m->m_data -= iphlen;
276	*ip = save_ip;
277	so->so_m = m; /* ICMP backup */
278
279	return;
280
281	bad:
282	Log2(("NAT: UDP datagram to %R[IP4] with size(%d) claimed as bad\n",
283	&ip->ip_dst, ip->ip_len));
284	m_freem(pData, m);
285	return;
286	}
287
288	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
289	struct sockaddr_in saddr, struct sockaddr_in daddr,
290	int iptos)
291	{
292	register struct udpiphdr *ui;
293	int error = 0;
294
295	DEBUG_CALL("udp_output");
296	DEBUG_ARG("so = %lx", (long)so);
297	DEBUG_ARG("m = %lx", (long)m);
298	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
299	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
300
301	/*
302	* Adjust for header
303	*/
304	m->m_data -= sizeof(struct udpiphdr);
305	m->m_len += sizeof(struct udpiphdr);
306
307	/*
308	* Fill in mbuf with extended UDP header
309	* and addresses and length put into network format.
310	*/
311	ui = mtod(m, struct udpiphdr *);
312	memset(ui->ui_x1, 0, 9);
313	ui->ui_pr = IPPROTO_UDP;
314	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
315	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
316	ui->ui_src = saddr->sin_addr;
317	ui->ui_dst = daddr->sin_addr;
318	ui->ui_sport = saddr->sin_port;
319	ui->ui_dport = daddr->sin_port;
320	ui->ui_ulen = ui->ui_len;
321
322	/*
323	* Stuff checksum and output datagram.
324	*/
325	ui->ui_sum = 0;
326	if (udpcksum)
327	{
328	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
329	ui->ui_sum = 0xffff;
330	}
331	((struct ip *)ui)->ip_len = m->m_len;
332	((struct ip *)ui)->ip_ttl = ip_defttl;
333	((struct ip *)ui)->ip_tos = iptos;
334
335	udpstat.udps_opackets++;
336
337	error = ip_output(pData, so, m);
338
339	return error;
340	}
341
342	int udp_output(PNATState pData, struct socket so, struct mbuf m,
343	struct sockaddr_in *addr)
344	{
345	struct sockaddr_in saddr, daddr;
346
347	saddr = *addr;
348	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
349	{
350	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
351	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
352	saddr.sin_addr.s_addr = alias_addr.s_addr;
353	}
354
355	/* Any UDP packet to the loopback address must be translated to be from
356	* the forwarding address, i.e. 10.0.2.2. */
357	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
358	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
359	saddr.sin_addr.s_addr = alias_addr.s_addr;
360
361	daddr.sin_addr = so->so_laddr;
362	daddr.sin_port = so->so_lport;
363
364	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
365	}
366
367	int
368	udp_attach(PNATState pData, struct socket *so, int service_port)
369	{
370	struct sockaddr_in addr;
371	struct sockaddr sa_addr;
372	socklen_t socklen = sizeof(struct sockaddr);
373	int status;
374
375	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) != -1)
376	{
377	/*
378	* Here, we bind() the socket. Although not really needed
379	* (sendto() on an unbound socket will bind it), it's done
380	* here so that emulation of ytalk etc. don't have to do it
381	*/
382	memset(&addr, 0, sizeof(addr));
383	#ifdef RT_OS_DARWIN
384	addr.sin_len = sizeof(addr);
385	#endif
386	addr.sin_family = AF_INET;
387	addr.sin_port = service_port;
388	addr.sin_addr.s_addr = pData->bindIP.s_addr;
389	fd_nonblock(so->s);
390	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
391	{
392	int lasterrno = errno;
393	closesocket(so->s);
394	so->s = -1;
395	#ifdef RT_OS_WINDOWS
396	WSASetLastError(lasterrno);
397	#else
398	errno = lasterrno;
399	#endif
400	}
401	else
402	{
403	int opt = 1;
404	/* success, insert in queue */
405	so->so_expire = curtime + SO_EXPIRE;
406	/* enable broadcast for later use */
407	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
408	status = getsockname(so->s, &sa_addr, &socklen);
409	Assert(status == 0 && sa_addr.sa_family == AF_INET);
410	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
411	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
412	SOCKET_LOCK_CREATE(so);
413	QSOCKET_LOCK(udb);
414	insque(pData, so, &udb);
415	NSOCK_INC();
416	QSOCKET_UNLOCK(udb);
417	}
418	}
419	else
420	{
421	LogRel(("NAT: can't create datagramm socket\n"));
422	}
423	return so->s;
424	}
425
426	void
427	udp_detach(PNATState pData, struct socket *so)
428	{
429	if (so != &pData->icmp_socket)
430	{
431	QSOCKET_LOCK(udb);
432	SOCKET_LOCK(so);
433	QSOCKET_UNLOCK(udb);
434	closesocket(so->s);
435	sofree(pData, so);
436	SOCKET_UNLOCK(so);
437	}
438	}
439
440	static const struct tos_t udptos[] =
441	{
442	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
443	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
444	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
445	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
446	{ 0, 0, 0, 0 }
447	};
448
449	u_int8_t
450	udp_tos(struct socket *so)
451	{
452	int i = 0;
453
454	while(udptos[i].tos)
455	{
456	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
457	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
458	{
459	so->so_emu = udptos[i].emu;
460	return udptos[i].tos;
461	}
462	i++;
463	}
464
465	return 0;
466	}
467
468	#ifdef EMULATE_TALK
469	#include "talkd.h"
470	#endif
471
472	/*
473	* Here, talk/ytalk/ntalk requests must be emulated
474	*/
475	void
476	udp_emu(PNATState pData, struct socket so, struct mbuf m)
477	{
478	#ifndef VBOX_WITH_SLIRP_ALIAS
479	struct sockaddr_in addr;
480	socklen_t addrlen = sizeof(addr);
481	#ifdef EMULATE_TALK
482	CTL_MSG_OLD *omsg;
483	CTL_MSG *nmsg;
484	char buff[sizeof(CTL_MSG)];
485	u_char type;
486
487	struct talk_request
488	{
489	struct talk_request *next;
490	struct socket *udp_so;
491	struct socket *tcp_so;
492	} *req;
493
494	static struct talk_request *req_tbl = 0;
495
496	#endif
497
498	struct cu_header
499	{
500	uint16_t d_family; /* destination family */
501	uint16_t d_port; /* destination port */
502	uint32_t d_addr; /* destination address */
503	uint16_t s_family; /* source family */
504	uint16_t s_port; /* source port */
505	uint32_t so_addr; /* source address */
506	uint32_t seqn; /* sequence number */
507	uint16_t message; /* message */
508	uint16_t data_type; /* data type */
509	uint16_t pkt_len; /* packet length */
510	} *cu_head;
511
512	switch(so->so_emu)
513	{
514	#ifdef EMULATE_TALK
515	case EMU_TALK:
516	case EMU_NTALK:
517	/*
518	* Talk emulation. We always change the ctl_addr to get
519	* some answers from the daemon. When an ANNOUNCE comes,
520	* we send LEAVE_INVITE to the local daemons. Also when a
521	* DELETE comes, we send copies to the local daemons.
522	*/
523	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
524	return;
525
526	#define IS_OLD (so->so_emu == EMU_TALK)
527
528	#define COPY_MSG(dest, src) \
529	do { \
530	dest->type = src->type; \
531	dest->id_num = src->id_num; \
532	dest->pid = src->pid; \
533	dest->addr = src->addr; \
534	dest->ctl_addr = src->ctl_addr; \
535	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
536	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
537	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
538	} while (0)
539
540	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
541	/* old_sockaddr to sockaddr_in */
542
543
544	if (IS_OLD)
545	{
546	/* old talk */
547	omsg = mtod(m, CTL_MSG_OLD*);
548	nmsg = (CTL_MSG *) buff;
549	type = omsg->type;
550	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
551	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
552	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
553	}
554	else
555	{
556	/* new talk */
557	omsg = (CTL_MSG_OLD *) buff;
558	nmsg = mtod(m, CTL_MSG *);
559	type = nmsg->type;
560	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
561	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
562	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
563	}
564
565	if (type == LOOK_UP)
566	return; /* for LOOK_UP this is enough */
567
568	if (IS_OLD)
569	{
570	/* make a copy of the message */
571	COPY_MSG(nmsg, omsg);
572	nmsg->vers = 1;
573	nmsg->answer = 0;
574	}
575	else
576	COPY_MSG(omsg, nmsg);
577
578	/*
579	* If if is an ANNOUNCE message, we go through the
580	* request table to see if a tcp port has already
581	* been redirected for this socket. If not, we solisten()
582	* a new socket and add this entry to the table.
583	* The port number of the tcp socket and our IP
584	* are put to the addr field of the message structures.
585	* Then a LEAVE_INVITE is sent to both local daemon
586	* ports, 517 and 518. This is why we have two copies
587	* of the message, one in old talk and one in new talk
588	* format.
589	*/
590
591	if (type == ANNOUNCE)
592	{
593	int s;
594	u_short temp_port;
595
596	for (req = req_tbl; req; req = req->next)
597	if (so == req->udp_so)
598	break; /* found it */
599
600	if (!req)
601	{
602	/* no entry for so, create new */
603	req = (struct talk_request *)RTMemAlloc(sizeof(struct talk_request));
604	req->udp_so = so;
605	req->tcp_so = solisten(0,
606	OTOSIN(omsg, addr)->sin_addr.s_addr,
607	OTOSIN(omsg, addr)->sin_port,
608	SS_FACCEPTONCE);
609	req->next = req_tbl;
610	req_tbl = req;
611	}
612
613	/* replace port number in addr field */
614	addrlen = sizeof(addr);
615	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
616	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
617	OTOSIN(omsg, addr)->sin_addr = our_addr;
618	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
619	OTOSIN(nmsg, addr)->sin_addr = our_addr;
620
621	/* send LEAVE_INVITEs */
622	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
623	OTOSIN(omsg, ctl_addr)->sin_port = 0;
624	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
625	omsg->type = nmsg->type = LEAVE_INVITE;
626
627	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
628	addr.sin_addr = our_addr;
629	addr.sin_family = AF_INET;
630	addr.sin_port = htons(517);
631	sendto(s, (char )omsg, sizeof(omsg), 0,
632	(struct sockaddr *)&addr, sizeof(addr));
633	addr.sin_port = htons(518);
634	sendto(s, (char )nmsg, sizeof(nmsg), 0,
635	(struct sockaddr *) &addr, sizeof(addr));
636	closesocket(s) ;
637
638	omsg->type = nmsg->type = ANNOUNCE;
639	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
640	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
641	}
642
643	/*
644	* If it is a DELETE message, we send a copy to the
645	* local daemons. Then we delete the entry corresponding
646	* to our socket from the request table.
647	*/
648
649	if (type == DELETE)
650	{
651	struct talk_request temp_req, req_next;
652	int s;
653	u_short temp_port;
654
655	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
656	OTOSIN(omsg, ctl_addr)->sin_port = 0;
657	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
658
659	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
660	addr.sin_addr = our_addr;
661	addr.sin_family = AF_INET;
662	addr.sin_port = htons(517);
663	sendto(s, (char )omsg, sizeof(omsg), 0,
664	(struct sockaddr *)&addr, sizeof(addr));
665	addr.sin_port = htons(518);
666	sendto(s, (char )nmsg, sizeof(nmsg), 0,
667	(struct sockaddr *)&addr, sizeof(addr));
668	closesocket(s);
669
670	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
671	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
672
673	/* delete table entry */
674	if (so == req_tbl->udp_so)
675	{
676	temp_req = req_tbl;
677	req_tbl = req_tbl->next;
678	RTMemFree(temp_req);
679	}
680	else
681	{
682	temp_req = req_tbl;
683	for (req = req_tbl->next; req; req = req_next)
684	{
685	req_next = req->next;
686	if (so == req->udp_so)
687	{
688	temp_req->next = req_next;
689	RTMemFree(req);
690	break;
691	}
692	else
693	temp_req = req;
694	}
695	}
696	}
697
698	return;
699	#endif
700
701	case EMU_CUSEEME:
702	/*
703	* Cu-SeeMe emulation.
704	* Hopefully the packet is more that 16 bytes long. We don't
705	* do any other tests, just replace the address and port
706	* fields.
707	*/
708	if (m->m_len >= sizeof (*cu_head))
709	{
710	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
711	return;
712	cu_head = mtod(m, struct cu_header *);
713	cu_head->s_port = addr.sin_port;
714	cu_head->so_addr = our_addr.s_addr;
715	}
716	return;
717	}
718	#else /!VBOX_WITH_SLIRP_ALIAS/
719	so->so_emu = 0;
720	#endif /* VBOX_WITH_SLIRP_ALIAS */
721	}
722
723	struct socket *
724	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
725	{
726	struct sockaddr_in addr;
727	struct socket *so;
728	socklen_t addrlen = sizeof(struct sockaddr_in);
729	int opt = 1;
730
731	if ((so = socreate()) == NULL)
732	return NULL;
733
734	so->s = socket(AF_INET, SOCK_DGRAM, 0);
735	if (so->s == -1)
736	{
737	LogRel(("NAT: can't create datagram socket\n"));
738	RTMemFree(so);
739	return NULL;
740	}
741	so->so_expire = curtime + SO_EXPIRE;
742	fd_nonblock(so->s);
743	SOCKET_LOCK_CREATE(so);
744	QSOCKET_LOCK(udb);
745	insque(pData, so,&udb);
746	NSOCK_INC();
747	QSOCKET_UNLOCK(udb);
748
749	memset(&addr, 0, sizeof(addr));
750	#ifdef RT_OS_DARWIN
751	addr.sin_len = sizeof(addr);
752	#endif
753	addr.sin_family = AF_INET;
754	addr.sin_addr.s_addr = bind_addr;
755	addr.sin_port = port;
756
757	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
758	{
759	LogRel(("NAT: bind to %R[IP4] has been failed\n", &addr.sin_addr));
760	udp_detach(pData, so);
761	return NULL;
762	}
763	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
764	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
765
766	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
767	so->so_fport = addr.sin_port;
768	/* The original check was completely broken, as the commented out
769	* if statement was always true (INADDR_ANY=0). */
770	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
771	if (1 == 0) /* always use the else part */
772	so->so_faddr = alias_addr;
773	else
774	so->so_faddr = addr.sin_addr;
775
776	so->so_lport = lport;
777	so->so_laddr.s_addr = laddr;
778	if (flags != SS_FACCEPTONCE)
779	so->so_expire = 0;
780
781	so->so_state = SS_ISFCONNECTED;
782
783	return so;
784	}

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 21610

Download in other formats: