udp.c@ 19748

Last change on this file since 19748 was 17363, checked in by vboxsync, 16 years ago
NAT: dns proxy functions fine. the time out and switch to next server should be bit tested
Property svn:eol-style set to `native`
File size: 23.2 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	#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	#ifdef VBOX_WITH_SLIRP_DNS_PROXY
232	if ( (ip->ip_dst.s_addr == htonl(ntohl(special_addr.s_addr) \| CTL_DNS))
233	&& (ntohs(uh->uh_dport) == 53))
234	{
235	dnsproxy_query(pData, so, m, iphlen);
236	goto bad; /* it isn't bad, probably better to add additional label done for boot/tftf :) */
237	}
238	#endif
239
240	iphlen += sizeof(struct udphdr);
241	m->m_len -= iphlen;
242	m->m_data += iphlen;
243
244	/*
245	* Now we sendto() the packet.
246	*/
247	if (so->so_emu)
248	udp_emu(pData, so, m);
249
250	ttl = ip->ip_ttl = save_ip.ip_ttl;
251	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
252	if (ret < 0)
253	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
254	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
255
256	if (sosendto(pData, so, m) == -1)
257	{
258	m->m_len += iphlen;
259	m->m_data -= iphlen;
260	*ip = save_ip;
261	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n", errno, strerror(errno)));
262	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
263	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
264	so->so_m = NULL;
265	}
266
267	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
268
269	/* restore the orig mbuf packet */
270	m->m_len += iphlen;
271	m->m_data -= iphlen;
272	*ip = save_ip;
273	so->so_m = m; /* ICMP backup */
274
275	return;
276
277	bad:
278	m_freem(pData, m);
279	return;
280	}
281
282	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
283	struct sockaddr_in saddr, struct sockaddr_in daddr,
284	int iptos)
285	{
286	register struct udpiphdr *ui;
287	int error = 0;
288
289	DEBUG_CALL("udp_output");
290	DEBUG_ARG("so = %lx", (long)so);
291	DEBUG_ARG("m = %lx", (long)m);
292	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
293	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
294
295	/*
296	* Adjust for header
297	*/
298	m->m_data -= sizeof(struct udpiphdr);
299	m->m_len += sizeof(struct udpiphdr);
300
301	/*
302	* Fill in mbuf with extended UDP header
303	* and addresses and length put into network format.
304	*/
305	ui = mtod(m, struct udpiphdr *);
306	memset(ui->ui_x1, 0, 9);
307	ui->ui_pr = IPPROTO_UDP;
308	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
309	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
310	ui->ui_src = saddr->sin_addr;
311	ui->ui_dst = daddr->sin_addr;
312	ui->ui_sport = saddr->sin_port;
313	ui->ui_dport = daddr->sin_port;
314	ui->ui_ulen = ui->ui_len;
315
316	/*
317	* Stuff checksum and output datagram.
318	*/
319	ui->ui_sum = 0;
320	if (udpcksum)
321	{
322	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
323	ui->ui_sum = 0xffff;
324	}
325	((struct ip *)ui)->ip_len = m->m_len;
326	((struct ip *)ui)->ip_ttl = ip_defttl;
327	((struct ip *)ui)->ip_tos = iptos;
328
329	udpstat.udps_opackets++;
330
331	error = ip_output(pData, so, m);
332
333	return error;
334	}
335
336	int udp_output(PNATState pData, struct socket so, struct mbuf m,
337	struct sockaddr_in *addr)
338	{
339	struct sockaddr_in saddr, daddr;
340
341	saddr = *addr;
342	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
343	{
344	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
345	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
346	saddr.sin_addr.s_addr = alias_addr.s_addr;
347	}
348
349	/* Any UDP packet to the loopback address must be translated to be from
350	* the forwarding address, i.e. 10.0.2.2. */
351	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
352	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
353	saddr.sin_addr.s_addr = alias_addr.s_addr;
354
355	daddr.sin_addr = so->so_laddr;
356	daddr.sin_port = so->so_lport;
357
358	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
359	}
360
361	int
362	udp_attach(PNATState pData, struct socket *so, int service_port)
363	{
364	struct sockaddr_in addr;
365	struct sockaddr sa_addr;
366	socklen_t socklen = sizeof(struct sockaddr);
367	int status;
368
369	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) != -1)
370	{
371	/*
372	* Here, we bind() the socket. Although not really needed
373	* (sendto() on an unbound socket will bind it), it's done
374	* here so that emulation of ytalk etc. don't have to do it
375	*/
376	addr.sin_family = AF_INET;
377	addr.sin_port = service_port;
378	addr.sin_addr.s_addr = INADDR_ANY;
379	fd_nonblock(so->s);
380	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
381	{
382	int lasterrno = errno;
383	closesocket(so->s);
384	so->s = -1;
385	#ifdef RT_OS_WINDOWS
386	WSASetLastError(lasterrno);
387	#else
388	errno = lasterrno;
389	#endif
390	}
391	else
392	{
393	int opt = 1;
394	/* success, insert in queue */
395	so->so_expire = curtime + SO_EXPIRE;
396	/* enable broadcast for later use */
397	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
398	status = getsockname(so->s, &sa_addr, &socklen);
399	Assert(status == 0 && sa_addr.sa_family == AF_INET);
400	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
401	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
402	SOCKET_LOCK_CREATE(so);
403	QSOCKET_LOCK(udb);
404	insque(pData, so, &udb);
405	NSOCK_INC();
406	QSOCKET_UNLOCK(udb);
407	}
408	}
409	else
410	{
411	LogRel(("NAT: can't create datagramm socket\n"));
412	}
413	return so->s;
414	}
415
416	void
417	udp_detach(PNATState pData, struct socket *so)
418	{
419	if (so != &pData->icmp_socket)
420	{
421	QSOCKET_LOCK(udb);
422	SOCKET_LOCK(so);
423	QSOCKET_UNLOCK(udb);
424	closesocket(so->s);
425	sofree(pData, so);
426	SOCKET_UNLOCK(so);
427	}
428	}
429
430	static const struct tos_t udptos[] =
431	{
432	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
433	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
434	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
435	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
436	{ 0, 0, 0, 0 }
437	};
438
439	u_int8_t
440	udp_tos(struct socket *so)
441	{
442	int i = 0;
443
444	while(udptos[i].tos)
445	{
446	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
447	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
448	{
449	so->so_emu = udptos[i].emu;
450	return udptos[i].tos;
451	}
452	i++;
453	}
454
455	return 0;
456	}
457
458	#ifdef EMULATE_TALK
459	#include "talkd.h"
460	#endif
461
462	/*
463	* Here, talk/ytalk/ntalk requests must be emulated
464	*/
465	void
466	udp_emu(PNATState pData, struct socket so, struct mbuf m)
467	{
468	struct sockaddr_in addr;
469	socklen_t addrlen = sizeof(addr);
470	#ifdef EMULATE_TALK
471	CTL_MSG_OLD *omsg;
472	CTL_MSG *nmsg;
473	char buff[sizeof(CTL_MSG)];
474	u_char type;
475
476	struct talk_request
477	{
478	struct talk_request *next;
479	struct socket *udp_so;
480	struct socket *tcp_so;
481	} *req;
482
483	static struct talk_request *req_tbl = 0;
484
485	#endif
486
487	struct cu_header
488	{
489	uint16_t d_family; /* destination family */
490	uint16_t d_port; /* destination port */
491	uint32_t d_addr; /* destination address */
492	uint16_t s_family; /* source family */
493	uint16_t s_port; /* source port */
494	uint32_t so_addr; /* source address */
495	uint32_t seqn; /* sequence number */
496	uint16_t message; /* message */
497	uint16_t data_type; /* data type */
498	uint16_t pkt_len; /* packet length */
499	} *cu_head;
500
501	switch(so->so_emu)
502	{
503	#ifdef EMULATE_TALK
504	case EMU_TALK:
505	case EMU_NTALK:
506	/*
507	* Talk emulation. We always change the ctl_addr to get
508	* some answers from the daemon. When an ANNOUNCE comes,
509	* we send LEAVE_INVITE to the local daemons. Also when a
510	* DELETE comes, we send copies to the local daemons.
511	*/
512	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
513	return;
514
515	#define IS_OLD (so->so_emu == EMU_TALK)
516
517	#define COPY_MSG(dest, src) \
518	do { \
519	dest->type = src->type; \
520	dest->id_num = src->id_num; \
521	dest->pid = src->pid; \
522	dest->addr = src->addr; \
523	dest->ctl_addr = src->ctl_addr; \
524	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
525	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
526	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
527	} while (0)
528
529	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
530	/* old_sockaddr to sockaddr_in */
531
532
533	if (IS_OLD)
534	{
535	/* old talk */
536	omsg = mtod(m, CTL_MSG_OLD*);
537	nmsg = (CTL_MSG *) buff;
538	type = omsg->type;
539	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
540	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
541	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
542	}
543	else
544	{
545	/* new talk */
546	omsg = (CTL_MSG_OLD *) buff;
547	nmsg = mtod(m, CTL_MSG *);
548	type = nmsg->type;
549	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
550	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
551	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
552	}
553
554	if (type == LOOK_UP)
555	return; /* for LOOK_UP this is enough */
556
557	if (IS_OLD)
558	{
559	/* make a copy of the message */
560	COPY_MSG(nmsg, omsg);
561	nmsg->vers = 1;
562	nmsg->answer = 0;
563	}
564	else
565	COPY_MSG(omsg, nmsg);
566
567	/*
568	* If if is an ANNOUNCE message, we go through the
569	* request table to see if a tcp port has already
570	* been redirected for this socket. If not, we solisten()
571	* a new socket and add this entry to the table.
572	* The port number of the tcp socket and our IP
573	* are put to the addr field of the message structures.
574	* Then a LEAVE_INVITE is sent to both local daemon
575	* ports, 517 and 518. This is why we have two copies
576	* of the message, one in old talk and one in new talk
577	* format.
578	*/
579
580	if (type == ANNOUNCE)
581	{
582	int s;
583	u_short temp_port;
584
585	for(req = req_tbl; req; req = req->next)
586	if (so == req->udp_so)
587	break; /* found it */
588
589	if (!req)
590	{
591	/* no entry for so, create new */
592	req = (struct talk_request *)RTMemAlloc(sizeof(struct talk_request));
593	req->udp_so = so;
594	req->tcp_so = solisten(0,
595	OTOSIN(omsg, addr)->sin_addr.s_addr,
596	OTOSIN(omsg, addr)->sin_port,
597	SS_FACCEPTONCE);
598	req->next = req_tbl;
599	req_tbl = req;
600	}
601
602	/* replace port number in addr field */
603	addrlen = sizeof(addr);
604	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
605	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
606	OTOSIN(omsg, addr)->sin_addr = our_addr;
607	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
608	OTOSIN(nmsg, addr)->sin_addr = our_addr;
609
610	/* send LEAVE_INVITEs */
611	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
612	OTOSIN(omsg, ctl_addr)->sin_port = 0;
613	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
614	omsg->type = nmsg->type = LEAVE_INVITE;
615
616	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
617	addr.sin_addr = our_addr;
618	addr.sin_family = AF_INET;
619	addr.sin_port = htons(517);
620	sendto(s, (char )omsg, sizeof(omsg), 0,
621	(struct sockaddr *)&addr, sizeof(addr));
622	addr.sin_port = htons(518);
623	sendto(s, (char )nmsg, sizeof(nmsg), 0,
624	(struct sockaddr *) &addr, sizeof(addr));
625	closesocket(s) ;
626
627	omsg->type = nmsg->type = ANNOUNCE;
628	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
629	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
630	}
631
632	/*
633	* If it is a DELETE message, we send a copy to the
634	* local daemons. Then we delete the entry corresponding
635	* to our socket from the request table.
636	*/
637
638	if (type == DELETE)
639	{
640	struct talk_request temp_req, req_next;
641	int s;
642	u_short temp_port;
643
644	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
645	OTOSIN(omsg, ctl_addr)->sin_port = 0;
646	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
647
648	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
649	addr.sin_addr = our_addr;
650	addr.sin_family = AF_INET;
651	addr.sin_port = htons(517);
652	sendto(s, (char )omsg, sizeof(omsg), 0,
653	(struct sockaddr *)&addr, sizeof(addr));
654	addr.sin_port = htons(518);
655	sendto(s, (char )nmsg, sizeof(nmsg), 0,
656	(struct sockaddr *)&addr, sizeof(addr));
657	closesocket(s);
658
659	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
660	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
661
662	/* delete table entry */
663	if (so == req_tbl->udp_so)
664	{
665	temp_req = req_tbl;
666	req_tbl = req_tbl->next;
667	RTMemFree(temp_req);
668	}
669	else
670	{
671	temp_req = req_tbl;
672	for (req = req_tbl->next; req; req = req_next)
673	{
674	req_next = req->next;
675	if (so == req->udp_so)
676	{
677	temp_req->next = req_next;
678	RTMemFree(req);
679	break;
680	}
681	else
682	temp_req = req;
683	}
684	}
685	}
686
687	return;
688	#endif
689
690	case EMU_CUSEEME:
691	/*
692	* Cu-SeeMe emulation.
693	* Hopefully the packet is more that 16 bytes long. We don't
694	* do any other tests, just replace the address and port
695	* fields.
696	*/
697	if (m->m_len >= sizeof (*cu_head))
698	{
699	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
700	return;
701	cu_head = mtod(m, struct cu_header *);
702	cu_head->s_port = addr.sin_port;
703	cu_head->so_addr = our_addr.s_addr;
704	}
705	return;
706	}
707	}
708
709	struct socket *
710	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
711	{
712	struct sockaddr_in addr;
713	struct socket *so;
714	socklen_t addrlen = sizeof(struct sockaddr_in);
715	int opt = 1;
716
717	if ((so = socreate()) == NULL)
718	return NULL;
719
720	so->s = socket(AF_INET, SOCK_DGRAM, 0);
721	if (so->s == -1)
722	{
723	LogRel(("NAT: can't create datagram socket\n"));
724	RTMemFree(so);
725	return NULL;
726	}
727	so->so_expire = curtime + SO_EXPIRE;
728	fd_nonblock(so->s);
729	SOCKET_LOCK_CREATE(so);
730	QSOCKET_LOCK(udb);
731	insque(pData, so,&udb);
732	NSOCK_INC();
733	QSOCKET_UNLOCK(udb);
734
735	addr.sin_family = AF_INET;
736	addr.sin_addr.s_addr = INADDR_ANY;
737	addr.sin_port = port;
738
739	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
740	{
741	udp_detach(pData, so);
742	return NULL;
743	}
744	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
745	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
746
747	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
748	so->so_fport = addr.sin_port;
749	/* The original check was completely broken, as the commented out
750	* if statement was always true (INADDR_ANY=0). */
751	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
752	if (1 == 0) /* always use the else part */
753	so->so_faddr = alias_addr;
754	else
755	so->so_faddr = addr.sin_addr;
756
757	so->so_lport = lport;
758	so->so_laddr.s_addr = laddr;
759	if (flags != SS_FACCEPTONCE)
760	so->so_expire = 0;
761
762	so->so_state = SS_ISFCONNECTED;
763
764	return so;
765	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 19748

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