udp.c@ 15435

Last change on this file since 15435 was 15355, checked in by vboxsync, 16 years ago
slirp:icmp: enabling UDP traceroute on Unix
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File size: 22.5 KB

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

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 15435

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