udp.c@ 15444

Last change on this file since 15444 was 15443, checked in by vboxsync, 16 years ago
slirp:icmp: Fix of ttl setting on Darwin
Property svn:eol-style set to `native`
File size: 22.5 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	#if !defined(VBOX_WITH_BSD_REASS)
133	((struct ipovly *)ip)->ih_next = 0;
134	((struct ipovly *)ip)->ih_prev = 0;
135	((struct ipovly *)ip)->ih_x1 = 0;
136	#else
137	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
138	#endif
139	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
140	#if 0
141	/* keep uh_sum for ICMP reply */
142	uh->uh_sum = cksum(m, len + sizeof (struct ip));
143	if (uh->uh_sum)
144	{
145
146	#endif
147	if(cksum(m, len + sizeof(struct ip)))
148	{
149	udpstat.udps_badsum++;
150	goto bad;
151	}
152	}
153	#if 0
154	}
155	#endif
156
157	/*
158	* handle DHCP/BOOTP
159	*/
160	if (ntohs(uh->uh_dport) == BOOTP_SERVER)
161	{
162	bootp_input(pData, m);
163	goto bad;
164	}
165
166	/*
167	* handle TFTP
168	*/
169	if (ntohs(uh->uh_dport) == TFTP_SERVER)
170	{
171	tftp_input(pData, m);
172	goto bad;
173	}
174
175	/*
176	* Locate pcb for datagram.
177	*/
178	so = udp_last_so;
179	if ( so->so_lport != uh->uh_sport
180	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
181	{
182	struct socket *tmp;
183
184	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
185	{
186	if ( tmp->so_lport == uh->uh_sport
187	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
188	{
189	so = tmp;
190	break;
191	}
192	}
193	if (tmp == &udb)
194	so = NULL;
195	else
196	{
197	udpstat.udpps_pcbcachemiss++;
198	udp_last_so = so;
199	}
200	}
201
202	if (so == NULL)
203	{
204	/*
205	* If there's no socket for this packet,
206	* create one
207	*/
208	if ((so = socreate()) == NULL)
209	goto bad;
210	if (udp_attach(pData, so) == -1)
211	{
212	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
213	errno,strerror(errno)));
214	sofree(pData, so);
215	goto bad;
216	}
217
218	/*
219	* Setup fields
220	*/
221	/* udp_last_so = so; */
222	so->so_laddr = ip->ip_src;
223	so->so_lport = uh->uh_sport;
224
225	if ((so->so_iptos = udp_tos(so)) == 0)
226	so->so_iptos = ip->ip_tos;
227
228	/*
229	* XXXXX Here, check if it's in udpexec_list,
230	* and if it is, do the fork_exec() etc.
231	*/
232	}
233
234	so->so_faddr = ip->ip_dst; /* XXX */
235	so->so_fport = uh->uh_dport; /* XXX */
236
237	iphlen += sizeof(struct udphdr);
238	m->m_len -= iphlen;
239	m->m_data += iphlen;
240
241	/*
242	* Now we sendto() the packet.
243	*/
244	if (so->so_emu)
245	udp_emu(pData, so, m);
246
247	#ifdef VBOX_WITH_SLIRP_ICMP
248	ttl = ip->ip_ttl = save_ip.ip_ttl;
249	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
250	if (ret < 0) {
251	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
252	}
253	#endif
254	if(sosendto(pData, so,m) == -1)
255	{
256	m->m_len += iphlen;
257	m->m_data -= iphlen;
258	*ip = save_ip;
259	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
260	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
261	}
262
263	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
264
265	/* restore the orig mbuf packet */
266	m->m_len += iphlen;
267	m->m_data -= iphlen;
268	*ip = save_ip;
269	so->so_m = m; /* ICMP backup */
270
271	return;
272
273	bad:
274	m_freem(pData, m);
275	return;
276	}
277
278	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
279	struct sockaddr_in saddr, struct sockaddr_in daddr,
280	int iptos)
281	{
282	register struct udpiphdr *ui;
283	int error = 0;
284
285	DEBUG_CALL("udp_output");
286	DEBUG_ARG("so = %lx", (long)so);
287	DEBUG_ARG("m = %lx", (long)m);
288	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
289	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
290
291	/*
292	* Adjust for header
293	*/
294	m->m_data -= sizeof(struct udpiphdr);
295	m->m_len += sizeof(struct udpiphdr);
296
297	/*
298	* Fill in mbuf with extended UDP header
299	* and addresses and length put into network format.
300	*/
301	ui = mtod(m, struct udpiphdr *);
302	#if !defined(VBOX_WITH_BSD_REASS)
303	ui->ui_next = ui->ui_prev = 0;
304	ui->ui_x1 = 0;
305	#else
306	memset(ui->ui_x1, 0, 9);
307	#endif
308	ui->ui_pr = IPPROTO_UDP;
309	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
310	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
311	ui->ui_src = saddr->sin_addr;
312	ui->ui_dst = daddr->sin_addr;
313	ui->ui_sport = saddr->sin_port;
314	ui->ui_dport = daddr->sin_port;
315	ui->ui_ulen = ui->ui_len;
316
317	/*
318	* Stuff checksum and output datagram.
319	*/
320	ui->ui_sum = 0;
321	if (udpcksum)
322	{
323	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
324	ui->ui_sum = 0xffff;
325	}
326	((struct ip *)ui)->ip_len = m->m_len;
327	((struct ip *)ui)->ip_ttl = ip_defttl;
328	((struct ip *)ui)->ip_tos = iptos;
329
330	udpstat.udps_opackets++;
331
332	error = ip_output(pData, so, m);
333
334	return error;
335	}
336
337	int udp_output(PNATState pData, struct socket so, struct mbuf m,
338	struct sockaddr_in *addr)
339	{
340	struct sockaddr_in saddr, daddr;
341
342	saddr = *addr;
343	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
344	{
345	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
346	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
347	saddr.sin_addr.s_addr = alias_addr.s_addr;
348	}
349
350	/* Any UDP packet to the loopback address must be translated to be from
351	* the forwarding address, i.e. 10.0.2.2. */
352	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
353	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
354	saddr.sin_addr.s_addr = alias_addr.s_addr;
355
356	daddr.sin_addr = so->so_laddr;
357	daddr.sin_port = so->so_lport;
358
359	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
360	}
361
362	int
363	udp_attach(PNATState pData, struct socket *so)
364	{
365	struct sockaddr_in addr;
366	#ifdef VBOX_WITH_SLIRP_ICMP
367	struct sockaddr sa_addr;
368	socklen_t socklen = sizeof(struct sockaddr);
369	int status;
370	#endif
371
372	if ((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1)
373	{
374	/*
375	* Here, we bind() the socket. Although not really needed
376	* (sendto() on an unbound socket will bind it), it's done
377	* here so that emulation of ytalk etc. don't have to do it
378	*/
379	addr.sin_family = AF_INET;
380	addr.sin_port = 0;
381	addr.sin_addr.s_addr = INADDR_ANY;
382	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
383	{
384	int lasterrno = errno;
385	closesocket(so->s);
386	so->s = -1;
387	#ifdef RT_OS_WINDOWS
388	WSASetLastError(lasterrno);
389	#else
390	errno = lasterrno;
391	#endif
392	}
393	else
394	{
395	int opt = 1;
396	/* success, insert in queue */
397	so->so_expire = curtime + SO_EXPIRE;
398	/* enable broadcast for later use */
399	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
400	insque(pData, so,&udb);
401	#ifdef VBOX_WITH_SLIRP_ICMP
402	status = getsockname(so->s, &sa_addr, &socklen);
403	Assert(status == 0 && sa_addr.sa_family == AF_INET);
404	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
405	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
406	#endif
407	}
408	}
409	return so->s;
410	}
411
412	void
413	udp_detach(PNATState pData, struct socket *so)
414	{
415	#ifndef VBOX_WITH_SLIRP_ICMP
416	closesocket(so->s);
417	sofree(pData, so);
418	#else /! VBOX_WITH_SLIRP_ICMP /
419	if (so != &pData->icmp_socket)
420	{
421	closesocket(so->s);
422	sofree(pData, so);
423	}
424	#endif /* VBOX_WITH_SLIRP_ICMP */
425	}
426
427	static const struct tos_t udptos[] =
428	{
429	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
430	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
431	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
432	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
433	{ 0, 0, 0, 0 }
434	};
435
436	u_int8_t
437	udp_tos(struct socket *so)
438	{
439	int i = 0;
440
441	while(udptos[i].tos)
442	{
443	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
444	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
445	{
446	so->so_emu = udptos[i].emu;
447	return udptos[i].tos;
448	}
449	i++;
450	}
451
452	return 0;
453	}
454
455	#ifdef EMULATE_TALK
456	#include "talkd.h"
457	#endif
458
459	/*
460	* Here, talk/ytalk/ntalk requests must be emulated
461	*/
462	void
463	udp_emu(PNATState pData, struct socket so, struct mbuf m)
464	{
465	struct sockaddr_in addr;
466	socklen_t addrlen = sizeof(addr);
467	#ifdef EMULATE_TALK
468	CTL_MSG_OLD *omsg;
469	CTL_MSG *nmsg;
470	char buff[sizeof(CTL_MSG)];
471	u_char type;
472
473	struct talk_request
474	{
475	struct talk_request *next;
476	struct socket *udp_so;
477	struct socket *tcp_so;
478	} *req;
479
480	static struct talk_request *req_tbl = 0;
481
482	#endif
483
484	struct cu_header
485	{
486	uint16_t d_family; /* destination family */
487	uint16_t d_port; /* destination port */
488	uint32_t d_addr; /* destination address */
489	uint16_t s_family; /* source family */
490	uint16_t s_port; /* source port */
491	uint32_t so_addr; /* source address */
492	uint32_t seqn; /* sequence number */
493	uint16_t message; /* message */
494	uint16_t data_type; /* data type */
495	uint16_t pkt_len; /* packet length */
496	} *cu_head;
497
498	switch(so->so_emu)
499	{
500	#ifdef EMULATE_TALK
501	case EMU_TALK:
502	case EMU_NTALK:
503	/*
504	* Talk emulation. We always change the ctl_addr to get
505	* some answers from the daemon. When an ANNOUNCE comes,
506	* we send LEAVE_INVITE to the local daemons. Also when a
507	* DELETE comes, we send copies to the local daemons.
508	*/
509	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
510	return;
511
512	#define IS_OLD (so->so_emu == EMU_TALK)
513
514	#define COPY_MSG(dest, src) \
515	do { \
516	dest->type = src->type; \
517	dest->id_num = src->id_num; \
518	dest->pid = src->pid; \
519	dest->addr = src->addr; \
520	dest->ctl_addr = src->ctl_addr; \
521	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
522	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
523	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
524	} while (0)
525
526	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
527	/* old_sockaddr to sockaddr_in */
528
529
530	if (IS_OLD)
531	{
532	/* old talk */
533	omsg = mtod(m, CTL_MSG_OLD*);
534	nmsg = (CTL_MSG *) buff;
535	type = omsg->type;
536	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
537	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
538	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
539	}
540	else
541	{
542	/* new talk */
543	omsg = (CTL_MSG_OLD *) buff;
544	nmsg = mtod(m, CTL_MSG *);
545	type = nmsg->type;
546	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
547	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
548	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
549	}
550
551	if (type == LOOK_UP)
552	return; /* for LOOK_UP this is enough */
553
554	if (IS_OLD)
555	{
556	/* make a copy of the message */
557	COPY_MSG(nmsg, omsg);
558	nmsg->vers = 1;
559	nmsg->answer = 0;
560	}
561	else
562	COPY_MSG(omsg, nmsg);
563
564	/*
565	* If if is an ANNOUNCE message, we go through the
566	* request table to see if a tcp port has already
567	* been redirected for this socket. If not, we solisten()
568	* a new socket and add this entry to the table.
569	* The port number of the tcp socket and our IP
570	* are put to the addr field of the message structures.
571	* Then a LEAVE_INVITE is sent to both local daemon
572	* ports, 517 and 518. This is why we have two copies
573	* of the message, one in old talk and one in new talk
574	* format.
575	*/
576
577	if (type == ANNOUNCE)
578	{
579	int s;
580	u_short temp_port;
581
582	for(req = req_tbl; req; req = req->next)
583	if (so == req->udp_so)
584	break; /* found it */
585
586	if (!req)
587	{
588	/* no entry for so, create new */
589	req = (struct talk_request *)malloc(sizeof(struct talk_request));
590	req->udp_so = so;
591	req->tcp_so = solisten(0,
592	OTOSIN(omsg, addr)->sin_addr.s_addr,
593	OTOSIN(omsg, addr)->sin_port,
594	SS_FACCEPTONCE);
595	req->next = req_tbl;
596	req_tbl = req;
597	}
598
599	/* replace port number in addr field */
600	addrlen = sizeof(addr);
601	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
602	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
603	OTOSIN(omsg, addr)->sin_addr = our_addr;
604	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
605	OTOSIN(nmsg, addr)->sin_addr = our_addr;
606
607	/* send LEAVE_INVITEs */
608	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
609	OTOSIN(omsg, ctl_addr)->sin_port = 0;
610	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
611	omsg->type = nmsg->type = LEAVE_INVITE;
612
613	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
614	addr.sin_addr = our_addr;
615	addr.sin_family = AF_INET;
616	addr.sin_port = htons(517);
617	sendto(s, (char )omsg, sizeof(omsg), 0,
618	(struct sockaddr *)&addr, sizeof(addr));
619	addr.sin_port = htons(518);
620	sendto(s, (char )nmsg, sizeof(nmsg), 0,
621	(struct sockaddr *) &addr, sizeof(addr));
622	closesocket(s) ;
623
624	omsg->type = nmsg->type = ANNOUNCE;
625	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
626	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
627	}
628
629	/*
630	* If it is a DELETE message, we send a copy to the
631	* local daemons. Then we delete the entry corresponding
632	* to our socket from the request table.
633	*/
634
635	if (type == DELETE)
636	{
637	struct talk_request temp_req, req_next;
638	int s;
639	u_short temp_port;
640
641	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
642	OTOSIN(omsg, ctl_addr)->sin_port = 0;
643	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
644
645	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
646	addr.sin_addr = our_addr;
647	addr.sin_family = AF_INET;
648	addr.sin_port = htons(517);
649	sendto(s, (char )omsg, sizeof(omsg), 0,
650	(struct sockaddr *)&addr, sizeof(addr));
651	addr.sin_port = htons(518);
652	sendto(s, (char )nmsg, sizeof(nmsg), 0,
653	(struct sockaddr *)&addr, sizeof(addr));
654	closesocket(s);
655
656	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
657	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
658
659	/* delete table entry */
660	if (so == req_tbl->udp_so)
661	{
662	temp_req = req_tbl;
663	req_tbl = req_tbl->next;
664	free(temp_req);
665	}
666	else
667	{
668	temp_req = req_tbl;
669	for (req = req_tbl->next; req; req = req_next)
670	{
671	req_next = req->next;
672	if (so == req->udp_so)
673	{
674	temp_req->next = req_next;
675	free(req);
676	break;
677	}
678	else
679	temp_req = req;
680	}
681	}
682	}
683
684	return;
685	#endif
686
687	case EMU_CUSEEME:
688	/*
689	* Cu-SeeMe emulation.
690	* Hopefully the packet is more that 16 bytes long. We don't
691	* do any other tests, just replace the address and port
692	* fields.
693	*/
694	if (m->m_len >= sizeof (*cu_head))
695	{
696	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
697	return;
698	cu_head = mtod(m, struct cu_header *);
699	cu_head->s_port = addr.sin_port;
700	cu_head->so_addr = our_addr.s_addr;
701	}
702	return;
703	}
704	}
705
706	struct socket *
707	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
708	{
709	struct sockaddr_in addr;
710	struct socket *so;
711	socklen_t addrlen = sizeof(struct sockaddr_in);
712	int opt = 1;
713
714	if ((so = socreate()) == NULL)
715	{
716	free(so);
717	return NULL;
718	}
719	so->s = socket(AF_INET,SOCK_DGRAM,0);
720	so->so_expire = curtime + SO_EXPIRE;
721	insque(pData, so,&udb);
722
723	addr.sin_family = AF_INET;
724	addr.sin_addr.s_addr = INADDR_ANY;
725	addr.sin_port = port;
726
727	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
728	{
729	udp_detach(pData, so);
730	return NULL;
731	}
732	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
733	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
734
735	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
736	so->so_fport = addr.sin_port;
737	/* The original check was completely broken, as the commented out
738	* if statement was always true (INADDR_ANY=0). */
739	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
740	if (1 == 0) /* always use the else part */
741	so->so_faddr = alias_addr;
742	else
743	so->so_faddr = addr.sin_addr;
744
745	so->so_lport = lport;
746	so->so_laddr.s_addr = laddr;
747	if (flags != SS_FACCEPTONCE)
748	so->so_expire = 0;
749
750	so->so_state = SS_ISFCONNECTED;
751
752	return so;
753	}

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

source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 15444

Download in other formats: