slirp.c@ 3728

Last change on this file since 3728 was 3693, checked in by vboxsync, 18 years ago
OS2 -> RT_OS_OS2 (for the sake of completeness).
Property svn:eol-style set to `native`
File size: 19.8 KB

Line
1	#include "slirp.h"
2	#ifdef RT_OS_OS2
3	# include <paths.h>
4	#endif
5
6	#include <VBox/err.h>
7	#include <iprt/assert.h>
8
9	static const uint8_t special_ethaddr[6] = {
10	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
11	};
12
13	#ifdef _WIN32
14
15	static int get_dns_addr_domain(PNATState pData, struct in_addr *pdns_addr,
16	const char **ppszDomain)
17	{
18	int rc = 0;
19	FIXED_INFO *FixedInfo=NULL;
20	ULONG BufLen;
21	DWORD ret;
22	IP_ADDR_STRING *pIPAddr;
23	struct in_addr tmp_addr;
24
25	FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
26	BufLen = sizeof(FIXED_INFO);
27
28	if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
29	if (FixedInfo) {
30	GlobalFree(FixedInfo);
31	FixedInfo = NULL;
32	}
33	FixedInfo = GlobalAlloc(GPTR, BufLen);
34	}
35
36	if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
37	Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
38	if (FixedInfo) {
39	GlobalFree(FixedInfo);
40	FixedInfo = NULL;
41	}
42	rc = -1;
43	goto get_dns_prefix;
44	}
45
46	pIPAddr = &(FixedInfo->DnsServerList);
47	inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
48	*pdns_addr = tmp_addr;
49	Log(("nat: DNS Servers:\n"));
50	LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
51
52	pIPAddr = FixedInfo -> DnsServerList.Next;
53	while ( pIPAddr )
54	{
55	LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
56	pIPAddr = pIPAddr ->Next;
57	}
58	if (FixedInfo) {
59	GlobalFree(FixedInfo);
60	FixedInfo = NULL;
61	}
62
63	get_dns_prefix:
64	*ppszDomain = NULL;
65	{
66	OSVERSIONINFO ver;
67	char szDnsDomain[256];
68	DWORD dwSize = sizeof(szDnsDomain);
69
70	GetVersionEx(&ver);
71	if (ver.dwMajorVersion >= 5)
72	{
73	/* GetComputerNameEx exists in Windows versions starting with 2000. */
74	if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
75	{
76	if (szDnsDomain[0])
77	{
78	/* Just non-empty strings are valid. */
79	*ppszDomain = RTStrDup(szDnsDomain);
80	if (pData->fPassDomain)
81	LogRel(("NAT: passing domain name %s\n", szDnsDomain));
82	else
83	Log(("nat: ignoring domain %s\n", szDnsDomain));
84	}
85	}
86	else
87	Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
88	}
89	}
90	return rc;
91	}
92
93	#else
94
95	static int get_dns_addr_domain(PNATState pData, struct in_addr *pdns_addr,
96	const char **ppszDomain)
97	{
98	char buff[512];
99	char buff2[256];
100	FILE *f;
101	int found = 0;
102	struct in_addr tmp_addr;
103
104	#ifdef RT_OS_OS2
105	/* Try various locations. */
106	char *etc = getenv("ETC");
107	f = NULL;
108	if (etc)
109	{
110	snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
111	f = fopen(buff, "rt");
112	}
113	if (!f) {
114	snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
115	f = fopen(buff, "rt");
116	}
117	if (!f) {
118	snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
119	f = fopen(buff, "rt");
120	}
121	#else
122	f = fopen("/etc/resolv.conf", "r");
123	#endif
124	if (!f)
125	return -1;
126
127	*ppszDomain = NULL;
128	Log(("nat: DNS Servers:\n"));
129	while (fgets(buff, 512, f) != NULL) {
130	if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
131	if (!inet_aton(buff2, &tmp_addr))
132	continue;
133	if (tmp_addr.s_addr == loopback_addr.s_addr)
134	tmp_addr = our_addr;
135	/* If it's the first one, set it to dns_addr */
136	if (!found)
137	{
138	*pdns_addr = tmp_addr;
139	LogRel(("NAT: DNS address: %s\n", buff2));
140	}
141	else
142	LogRel(("NAT: ignored DNS address: %s\n", buff2));
143	found++;
144	}
145	if (!strncmp(buff, "domain", 6) \|\| !strncmp(buff, "search", 6))
146	{
147	/* Domain name/search list present. Pick first entry */
148	if (*ppszDomain == NULL)
149	{
150	char *tok;
151	tok = strtok(&buff[6], " \t\n");
152	if (tok)
153	{
154	*ppszDomain = RTStrDup(tok);
155	if (pData->fPassDomain)
156	LogRel(("NAT: passing domain name %s\n", tok));
157	else
158	Log(("nat: ignoring domain %s\n", tok));
159	}
160	}
161	}
162	}
163	fclose(f);
164	if (!found)
165	return -1;
166	return 0;
167	}
168
169	#endif
170
171	int slirp_init(PNATState ppData, const char pszNetAddr, bool fPassDomain, void *pvUser)
172	{
173	int fNATfailed = 0;
174	PNATState pData = malloc(sizeof(NATState));
175	*ppData = pData;
176	if (!pData)
177	return VERR_NO_MEMORY;
178	memset(pData, '\0', sizeof(NATState));
179	pData->fPassDomain = fPassDomain;
180	pData->pvUser = pvUser;
181	#if ARCH_BITS == 64
182	pData->cpvHashUsed = 1;
183	#endif
184
185	#ifdef _WIN32
186	{
187	WSADATA Data;
188	WSAStartup(MAKEWORD(2,0), &Data);
189	}
190	#endif
191
192	Assert(sizeof(struct ip) == 20);
193	link_up = 1;
194
195	if_init(pData);
196	ip_init(pData);
197
198	/* Initialise mbufs after setting the MTU */
199	m_init(pData);
200
201	/* set default addresses */
202	inet_aton("127.0.0.1", &loopback_addr);
203	inet_aton("127.0.0.1", &dns_addr);
204
205	if (get_dns_addr_domain(pData, &dns_addr, &pData->pszDomain) < 0)
206	fNATfailed = 1;
207
208	inet_aton(pszNetAddr, &special_addr);
209	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
210	getouraddr(pData);
211	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
212	}
213
214	/**
215	* Marks the link as up, making it possible to establish new connections.
216	*/
217	void slirp_link_up(PNATState pData)
218	{
219	link_up = 1;
220	}
221
222	/**
223	* Marks the link as down and cleans up the current connections.
224	*/
225	void slirp_link_down(PNATState pData)
226	{
227	struct socket *so;
228
229	while ((so = tcb.so_next) != &tcb)
230	{
231	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
232	sofree(pData, so);
233	else
234	tcp_drop(pData, sototcpcb(so), 0);
235	}
236
237	while ((so = udb.so_next) != &udb)
238	udp_detach(pData, so);
239
240	link_up = 0;
241	}
242
243	/**
244	* Terminates the slirp component.
245	*/
246	void slirp_term(PNATState pData)
247	{
248	if (pData->pszDomain)
249	RTStrFree((char )(void )pData->pszDomain);
250
251	#if ARCH_BITS == 64
252	LogRel(("NAT: cpvHashUsed=%RU32 cpvHashCollisions=%RU32 cpvHashInserts=%RU64 cpvHashDone=%RU64\n",
253	pData->cpvHashUsed, pData->cpvHashCollisions, pData->cpvHashInserts, pData->cpvHashDone));
254	#endif
255
256	slirp_link_down(pData);
257	#ifdef WIN32
258	WSACleanup();
259	#endif
260	#ifdef LOG_ENABLED
261	Log(("\n"
262	"NAT statistics\n"
263	"--------------\n"
264	"\n"));
265	ipstats(pData);
266	tcpstats(pData);
267	udpstats(pData);
268	icmpstats(pData);
269	mbufstats(pData);
270	sockstats(pData);
271	Log(("\n"
272	"\n"
273	"\n"));
274	#endif
275	free(pData);
276	}
277
278
279	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
280	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
281	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
282
283	/*
284	* curtime kept to an accuracy of 1ms
285	*/
286	#ifdef _WIN32
287	static void updtime(PNATState pData)
288	{
289	struct _timeb tb;
290
291	_ftime(&tb);
292	curtime = (u_int)tb.time * (u_int)1000;
293	curtime += (u_int)tb.millitm;
294	}
295	#else
296	static void updtime(PNATState pData)
297	{
298	gettimeofday(&tt, 0);
299
300	curtime = (u_int)tt.tv_sec * (u_int)1000;
301	curtime += (u_int)tt.tv_usec / (u_int)1000;
302
303	if ((tt.tv_usec % 1000) >= 500)
304	curtime++;
305	}
306	#endif
307
308	void slirp_select_fill(PNATState pData, int *pnfds,
309	fd_set readfds, fd_set writefds, fd_set *xfds)
310	{
311	struct socket so, so_next;
312	struct timeval timeout;
313	int nfds;
314	int tmp_time;
315
316	nfds = *pnfds;
317	/*
318	* First, TCP sockets
319	*/
320	do_slowtimo = 0;
321	if (link_up) {
322	/*
323	* *_slowtimo needs calling if there are IP fragments
324	* in the fragment queue, or there are TCP connections active
325	*/
326	do_slowtimo = ((tcb.so_next != &tcb) \|\|
327	((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
328
329	for (so = tcb.so_next; so != &tcb; so = so_next) {
330	so_next = so->so_next;
331
332	/*
333	* See if we need a tcp_fasttimo
334	*/
335	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
336	time_fasttimo = curtime; /* Flag when we want a fasttimo */
337
338	/*
339	* NOFDREF can include still connecting to local-host,
340	* newly socreated() sockets etc. Don't want to select these.
341	*/
342	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
343	continue;
344
345	/*
346	* Set for reading sockets which are accepting
347	*/
348	if (so->so_state & SS_FACCEPTCONN) {
349	FD_SET(so->s, readfds);
350	UPD_NFDS(so->s);
351	continue;
352	}
353
354	/*
355	* Set for writing sockets which are connecting
356	*/
357	if (so->so_state & SS_ISFCONNECTING) {
358	FD_SET(so->s, writefds);
359	UPD_NFDS(so->s);
360	continue;
361	}
362
363	/*
364	* Set for writing if we are connected, can send more, and
365	* we have something to send
366	*/
367	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
368	FD_SET(so->s, writefds);
369	UPD_NFDS(so->s);
370	}
371
372	/*
373	* Set for reading (and urgent data) if we are connected, can
374	* receive more, and we have room for it XXX /2 ?
375	*/
376	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
377	FD_SET(so->s, readfds);
378	FD_SET(so->s, xfds);
379	UPD_NFDS(so->s);
380	}
381	}
382
383	/*
384	* UDP sockets
385	*/
386	for (so = udb.so_next; so != &udb; so = so_next) {
387	so_next = so->so_next;
388
389	/*
390	* See if it's timed out
391	*/
392	if (so->so_expire) {
393	if (so->so_expire <= curtime) {
394	udp_detach(pData, so);
395	continue;
396	} else
397	do_slowtimo = 1; /* Let socket expire */
398	}
399
400	/*
401	* When UDP packets are received from over the
402	* link, they're sendto()'d straight away, so
403	* no need for setting for writing
404	* Limit the number of packets queued by this session
405	* to 4. Note that even though we try and limit this
406	* to 4 packets, the session could have more queued
407	* if the packets needed to be fragmented
408	* (XXX <= 4 ?)
409	*/
410	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
411	FD_SET(so->s, readfds);
412	UPD_NFDS(so->s);
413	}
414	}
415	}
416
417	/*
418	* Setup timeout to use minimum CPU usage, especially when idle
419	*/
420
421	/*
422	* First, see the timeout needed by *timo
423	*/
424	timeout.tv_sec = 0;
425	timeout.tv_usec = -1;
426	/*
427	* If a slowtimo is needed, set timeout to 500ms from the last
428	* slow timeout. If a fast timeout is needed, set timeout within
429	* 200ms of when it was requested.
430	*/
431	if (do_slowtimo) {
432	/* XXX + 10000 because some select()'s aren't that accurate */
433	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
434	if (timeout.tv_usec < 0)
435	timeout.tv_usec = 0;
436	else if (timeout.tv_usec > 510000)
437	timeout.tv_usec = 510000;
438
439	/* Can only fasttimo if we also slowtimo */
440	if (time_fasttimo) {
441	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
442	if (tmp_time < 0)
443	tmp_time = 0;
444
445	/* Choose the smallest of the 2 */
446	if (tmp_time < timeout.tv_usec)
447	timeout.tv_usec = (u_int)tmp_time;
448	}
449	}
450	*pnfds = nfds;
451	}
452
453	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
454	{
455	struct socket so, so_next;
456	int ret;
457
458	/* Update time */
459	updtime(pData);
460
461	/*
462	* See if anything has timed out
463	*/
464	if (link_up) {
465	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
466	tcp_fasttimo(pData);
467	time_fasttimo = 0;
468	}
469	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
470	ip_slowtimo(pData);
471	tcp_slowtimo(pData);
472	last_slowtimo = curtime;
473	}
474	}
475
476	/*
477	* Check sockets
478	*/
479	if (link_up) {
480	/*
481	* Check TCP sockets
482	*/
483	for (so = tcb.so_next; so != &tcb; so = so_next) {
484	so_next = so->so_next;
485
486	/*
487	* FD_ISSET is meaningless on these sockets
488	* (and they can crash the program)
489	*/
490	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
491	continue;
492
493	/*
494	* Check for URG data
495	* This will soread as well, so no need to
496	* test for readfds below if this succeeds
497	*/
498	if (FD_ISSET(so->s, xfds))
499	sorecvoob(pData, so);
500	/*
501	* Check sockets for reading
502	*/
503	else if (FD_ISSET(so->s, readfds)) {
504	/*
505	* Check for incoming connections
506	*/
507	if (so->so_state & SS_FACCEPTCONN) {
508	tcp_connect(pData, so);
509	continue;
510	} /* else */
511	ret = soread(pData, so);
512
513	/* Output it if we read something */
514	if (ret > 0)
515	tcp_output(pData, sototcpcb(so));
516	}
517
518	/*
519	* Check sockets for writing
520	*/
521	if (FD_ISSET(so->s, writefds)) {
522	/*
523	* Check for non-blocking, still-connecting sockets
524	*/
525	if (so->so_state & SS_ISFCONNECTING) {
526	/* Connected */
527	so->so_state &= ~SS_ISFCONNECTING;
528
529	ret = send(so->s, (const char *)&ret, 0, 0);
530	if (ret < 0) {
531	/* XXXXX Must fix, zero bytes is a NOP */
532	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
533	errno == EINPROGRESS \|\| errno == ENOTCONN)
534	continue;
535
536	/* else failed */
537	so->so_state = SS_NOFDREF;
538	}
539	/* else so->so_state &= ~SS_ISFCONNECTING; */
540
541	/*
542	* Continue tcp_input
543	*/
544	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
545	/* continue; */
546	} else
547	ret = sowrite(pData, so);
548	/*
549	* XXXXX If we wrote something (a lot), there
550	* could be a need for a window update.
551	* In the worst case, the remote will send
552	* a window probe to get things going again
553	*/
554	}
555
556	/*
557	* Probe a still-connecting, non-blocking socket
558	* to check if it's still alive
559	*/
560	#ifdef PROBE_CONN
561	if (so->so_state & SS_ISFCONNECTING) {
562	ret = recv(so->s, (char *)&ret, 0,0);
563
564	if (ret < 0) {
565	/* XXX */
566	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
567	errno == EINPROGRESS \|\| errno == ENOTCONN)
568	continue; /* Still connecting, continue */
569
570	/* else failed */
571	so->so_state = SS_NOFDREF;
572
573	/* tcp_input will take care of it */
574	} else {
575	ret = send(so->s, &ret, 0,0);
576	if (ret < 0) {
577	/* XXX */
578	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
579	errno == EINPROGRESS \|\| errno == ENOTCONN)
580	continue;
581	/* else failed */
582	so->so_state = SS_NOFDREF;
583	} else
584	so->so_state &= ~SS_ISFCONNECTING;
585
586	}
587	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
588	} /* SS_ISFCONNECTING */
589	#endif
590	}
591
592	/*
593	* Now UDP sockets.
594	* Incoming packets are sent straight away, they're not buffered.
595	* Incoming UDP data isn't buffered either.
596	*/
597	for (so = udb.so_next; so != &udb; so = so_next) {
598	so_next = so->so_next;
599
600	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
601	sorecvfrom(pData, so);
602	}
603	}
604	}
605
606	/*
607	* See if we can start outputting
608	*/
609	if (if_queued && link_up)
610	if_start(pData);
611	}
612
613	#define ETH_ALEN 6
614	#define ETH_HLEN 14
615
616	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
617	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
618
619	#define ARPOP_REQUEST 1 /* ARP request */
620	#define ARPOP_REPLY 2 /* ARP reply */
621
622	struct ethhdr
623	{
624	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
625	unsigned char h_source[ETH_ALEN]; /* source ether addr */
626	unsigned short h_proto; /* packet type ID field */
627	};
628
629	struct arphdr
630	{
631	unsigned short ar_hrd; /* format of hardware address */
632	unsigned short ar_pro; /* format of protocol address */
633	unsigned char ar_hln; /* length of hardware address */
634	unsigned char ar_pln; /* length of protocol address */
635	unsigned short ar_op; /* ARP opcode (command) */
636
637	/*
638	* Ethernet looks like this : This bit is variable sized however...
639	*/
640	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
641	unsigned char ar_sip[4]; /* sender IP address */
642	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
643	unsigned char ar_tip[4]; /* target IP address */
644	};
645
646	static
647	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
648	{
649	struct ethhdr eh = (struct ethhdr )pkt;
650	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
651	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
652	struct ethhdr reh = (struct ethhdr )arp_reply;
653	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
654	int ar_op;
655	struct ex_list *ex_ptr;
656
657	ar_op = ntohs(ah->ar_op);
658	switch(ar_op) {
659	case ARPOP_REQUEST:
660	if (!memcmp(ah->ar_tip, &special_addr, 3)) {
661	if (ah->ar_tip[3] == CTL_DNS \|\| ah->ar_tip[3] == CTL_ALIAS)
662	goto arp_ok;
663	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
664	if (ex_ptr->ex_addr == ah->ar_tip[3])
665	goto arp_ok;
666	}
667	return;
668	arp_ok:
669	/* XXX: make an ARP request to have the client address */
670	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
671
672	/* ARP request for alias/dns mac address */
673	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
674	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
675	reh->h_source[5] = ah->ar_tip[3];
676	reh->h_proto = htons(ETH_P_ARP);
677
678	rah->ar_hrd = htons(1);
679	rah->ar_pro = htons(ETH_P_IP);
680	rah->ar_hln = ETH_ALEN;
681	rah->ar_pln = 4;
682	rah->ar_op = htons(ARPOP_REPLY);
683	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
684	memcpy(rah->ar_sip, ah->ar_tip, 4);
685	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
686	memcpy(rah->ar_tip, ah->ar_sip, 4);
687	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
688	}
689	break;
690	default:
691	break;
692	}
693	}
694
695	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
696	{
697	struct mbuf *m;
698	int proto;
699
700	if (pkt_len < ETH_HLEN)
701	return;
702
703	proto = ntohs((uint16_t )(pkt + 12));
704	switch(proto) {
705	case ETH_P_ARP:
706	arp_input(pData, pkt, pkt_len);
707	break;
708	case ETH_P_IP:
709	/* Update time. Important if the network is very quiet, as otherwise
710	* the first outgoing connection gets an incorrect timestamp. */
711	updtime(pData);
712
713	m = m_get(pData);
714	if (!m)
715	return;
716	/* Note: we add to align the IP header */
717	if (M_FREEROOM(m) < pkt_len + 2) {
718	m_inc(m, pkt_len + 2);
719	}
720	m->m_len = pkt_len + 2;
721	memcpy(m->m_data + 2, pkt, pkt_len);
722
723	m->m_data += 2 + ETH_HLEN;
724	m->m_len -= 2 + ETH_HLEN;
725
726	ip_input(pData, m);
727	break;
728	default:
729	break;
730	}
731	}
732
733	/* output the IP packet to the ethernet device */
734	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
735	{
736	uint8_t buf[1600];
737	struct ethhdr eh = (struct ethhdr )buf;
738
739	if (ip_data_len + ETH_HLEN > sizeof(buf))
740	return;
741
742	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
743	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
744	/* XXX: not correct */
745	eh->h_source[5] = CTL_ALIAS;
746	eh->h_proto = htons(ETH_P_IP);
747	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
748	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
749	}
750
751	int slirp_redir(PNATState pData, int is_udp, int host_port,
752	struct in_addr guest_addr, int guest_port)
753	{
754	if (is_udp) {
755	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
756	htons(guest_port), 0))
757	return -1;
758	} else {
759	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
760	htons(guest_port), 0))
761	return -1;
762	}
763	return 0;
764	}
765
766	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
767	int guest_port)
768	{
769	return add_exec(&exec_list, do_pty, (char *)args,
770	addr_low_byte, htons(guest_port));
771	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 3728

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