slirp.c@ 1036

最後變更在這個檔案從1036是 1036,由 vboxsync 提交於 18 年前
Fixed Windows part of slirp, too.
屬性 svn:eol-style 設為 `native`
檔案大小: 22.9 KB

行
1	#include "slirp.h"
2	#ifdef __OS2__
3	# include <paths.h>
4	#endif
5	#ifdef VBOX
6	# include <VBox/err.h>
7	# include <iprt/assert.h>
8	#endif
9
10	#ifndef VBOX
11	/* host address */
12	struct in_addr our_addr;
13	/* host dns address */
14	struct in_addr dns_addr;
15	/* host loopback address */
16	struct in_addr loopback_addr;
17
18	/* address for slirp virtual addresses */
19	struct in_addr special_addr;
20	/* virtual address alias for host */
21	struct in_addr alias_addr;
22	#endif /* !VBOX */
23
24	#ifdef VBOX
25	static const uint8_t special_ethaddr[6] = {
26	#else /* !VBOX */
27	const uint8_t special_ethaddr[6] = {
28	#endif /* !VBOX */
29	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
30	};
31
32	#ifndef VBOX
33	uint8_t client_ethaddr[6];
34
35	int do_slowtimo;
36	int link_up;
37	struct timeval tt;
38	FILE *lfd;
39	struct ex_list *exec_list;
40	#endif /* !VBOX */
41
42	#ifndef VBOX
43	/* XXX: suppress those select globals */
44	fd_set global_readfds, global_writefds, *global_xfds;
45
46	char slirp_hostname[33];
47	#endif /* !VBOX */
48
49	#ifdef _WIN32
50
51	#ifdef VBOX
52	static int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
53	#else /* !VBOX */
54	static int get_dns_addr(struct in_addr *pdns_addr)
55	#endif /* !VBOX */
56	{
57	FIXED_INFO *FixedInfo=NULL;
58	ULONG BufLen;
59	DWORD ret;
60	IP_ADDR_STRING *pIPAddr;
61	struct in_addr tmp_addr;
62
63	FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
64	BufLen = sizeof(FIXED_INFO);
65
66	if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
67	if (FixedInfo) {
68	GlobalFree(FixedInfo);
69	FixedInfo = NULL;
70	}
71	FixedInfo = GlobalAlloc(GPTR, BufLen);
72	}
73
74	if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
75	#ifndef VBOX
76	printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
77	#else /* VBOX */
78	Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
79	#endif /* VBOX */
80	if (FixedInfo) {
81	GlobalFree(FixedInfo);
82	FixedInfo = NULL;
83	}
84	return -1;
85	}
86
87	pIPAddr = &(FixedInfo->DnsServerList);
88	inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
89	*pdns_addr = tmp_addr;
90	#ifndef VBOX
91	#if 0
92	printf( "DNS Servers:\n" );
93	printf( "DNS Addr:%s\n", pIPAddr->IpAddress.String );
94
95	pIPAddr = FixedInfo -> DnsServerList.Next;
96	while ( pIPAddr ) {
97	printf( "DNS Addr:%s\n", pIPAddr ->IpAddress.String );
98	pIPAddr = pIPAddr ->Next;
99	}
100	#endif
101	#else /* VBOX */
102	Log(("nat: DNS Servers:\n"));
103	Log(("nat: DNS Addr:%s\n", pIPAddr->IpAddress.String));
104
105	pIPAddr = FixedInfo -> DnsServerList.Next;
106	while ( pIPAddr ) {
107	Log(("nat: DNS Addr:%s\n", pIPAddr ->IpAddress.String));
108	pIPAddr = pIPAddr ->Next;
109	}
110	#endif /* VBOX */
111	if (FixedInfo) {
112	GlobalFree(FixedInfo);
113	FixedInfo = NULL;
114	}
115	return 0;
116	}
117
118	#else
119
120	#ifdef VBOX
121	static int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
122	#else /* !VBOX */
123	static int get_dns_addr(struct in_addr *pdns_addr)
124	#endif /* !VBOX */
125	{
126	char buff[512];
127	char buff2[256];
128	FILE *f;
129	int found = 0;
130	struct in_addr tmp_addr;
131
132	#ifdef __OS2__
133	/* Try various locations. */
134	char *etc = getenv("ETC");
135	f = NULL;
136	if (etc)
137	{
138	snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
139	f = fopen(buff, "rt");
140	}
141	if (!f) {
142	snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
143	f = fopen(buff, "rt");
144	}
145	if (!f) {
146	snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
147	f = fopen(buff, "rt");
148	}
149	#else
150	f = fopen("/etc/resolv.conf", "r");
151	#endif
152	if (!f)
153	return -1;
154
155	#ifndef VBOX
156	lprint("IP address of your DNS(s): ");
157	#else /* VBOX */
158	Log(("nat: IP address of your DNS(s): \n"));
159	#endif /* VBOX */
160	while (fgets(buff, 512, f) != NULL) {
161	if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
162	if (!inet_aton(buff2, &tmp_addr))
163	continue;
164	if (tmp_addr.s_addr == loopback_addr.s_addr)
165	tmp_addr = our_addr;
166	/* If it's the first one, set it to dns_addr */
167	if (!found)
168	*pdns_addr = tmp_addr;
169	#ifndef VBOX
170	else
171	lprint(", ");
172	#endif /* !VBOX */
173	if (++found > 3) {
174	#ifndef VBOX
175	lprint("(more)");
176	#else /* VBOX */
177	Log(("nat: (more)\n"));
178	#endif /* VBOX */
179	break;
180	} else
181	#ifndef VBOX
182	lprint("%s", inet_ntoa(tmp_addr));
183	#else /* VBOX */
184	Log(("nat: %s\n", inet_ntoa(tmp_addr)));
185	#endif /* VBOX */
186	}
187	}
188	fclose(f);
189	if (!found)
190	return -1;
191	return 0;
192	}
193
194	#endif
195
196	#ifndef VBOX
197	#ifdef _WIN32
198	void slirp_cleanup(void)
199	{
200	WSACleanup();
201	}
202	#endif
203	#endif /* !VBOX (see slirp_term) */
204
205	#ifndef VBOX
206	void slirp_init(void)
207	{
208	/* debug_init("/tmp/slirp.log", DEBUG_DEFAULT); */
209	#else /* VBOX */
210	/** Number of slirp users. Used for making sure init and term are only executed once. */
211	int slirp_init(PNATState ppData, const char pszNetAddr, void *pvUser)
212	{
213	PNATState pData = malloc(sizeof(NATState));
214	*ppData = pData;
215	if (!pData)
216	return VERR_NO_MEMORY;
217	memset(pData, '\0', sizeof(NATState));
218	pData->pvUser = pvUser;
219	#endif /* VBOX */
220
221	#ifdef _WIN32
222	{
223	WSADATA Data;
224	WSAStartup(MAKEWORD(2,0), &Data);
225	#ifndef VBOX
226	atexit(slirp_cleanup);
227	#endif /* !VBOX */
228	}
229	#endif
230
231	#ifdef VBOX
232	Assert(sizeof(struct ip) == 20);
233	#endif /* VBOX */
234	link_up = 1;
235
236	#ifdef VBOX
237	if_init(pData);
238	ip_init(pData);
239	#else /* !VBOX */
240	if_init();
241	ip_init();
242	#endif /* !VBOX */
243
244	/* Initialise mbufs after setting the MTU */
245	#ifdef VBOX
246	m_init(pData);
247	#else /* !VBOX */
248	m_init();
249	#endif /* !VBOX */
250
251	/* set default addresses */
252	inet_aton("127.0.0.1", &loopback_addr);
253
254	#ifdef VBOX
255	if (get_dns_addr(pData, &dns_addr) < 0) {
256	#else /* !VBOX */
257	if (get_dns_addr(&dns_addr) < 0) {
258	#endif /* !VBOX */
259	#ifndef VBOX
260	dns_addr = loopback_addr;
261	fprintf (stderr, "Warning: No DNS servers found\n");
262	#else
263	return VERR_NAT_DNS;
264	#endif
265	}
266
267	#ifdef VBOX
268	inet_aton(pszNetAddr, &special_addr);
269	#else /* !VBOX */
270	inet_aton(CTL_SPECIAL, &special_addr);
271	#endif /* !VBOX */
272	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
273	#ifdef VBOX
274	getouraddr(pData);
275	return VINF_SUCCESS;
276	#else /* !VBOX */
277	getouraddr();
278	#endif /* !VBOX */
279	}
280
281	#ifdef VBOX
282	/**
283	* Marks the link as up, making it possible to establish new connections.
284	*/
285	void slirp_link_up(PNATState pData)
286	{
287	link_up = 1;
288	}
289
290	/**
291	* Marks the link as down and cleans up the current connections.
292	*/
293	void slirp_link_down(PNATState pData)
294	{
295	struct socket *so;
296
297	while ((so = tcb.so_next) != &tcb)
298	{
299	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
300	sofree(pData, so);
301	else
302	tcp_drop(pData, sototcpcb(so), 0);
303	}
304
305	while ((so = udb.so_next) != &udb)
306	udp_detach(pData, so);
307
308	link_up = 0;
309	}
310
311	/**
312	* Terminates the slirp component.
313	*/
314	void slirp_term(PNATState pData)
315	{
316	slirp_link_down(pData);
317	#ifdef WIN32
318	WSACleanup();
319	#endif
320	#ifdef LOG_ENABLED
321	Log(("\n"
322	"NAT statistics\n"
323	"--------------\n"
324	"\n"));
325	ipstats(pData);
326	tcpstats(pData);
327	udpstats(pData);
328	icmpstats(pData);
329	mbufstats(pData);
330	sockstats(pData);
331	Log(("\n"
332	"\n"
333	"\n"));
334	#endif
335	free(pData);
336	}
337	#endif /* VBOX */
338
339
340	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
341	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
342	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
343
344	/*
345	* curtime kept to an accuracy of 1ms
346	*/
347	#ifdef _WIN32
348	#ifdef VBOX
349	static void updtime(PNATState pData)
350	#else /* !VBOX */
351	static void updtime(void)
352	#endif /* !VBOX */
353	{
354	struct _timeb tb;
355
356	_ftime(&tb);
357	curtime = (u_int)tb.time * (u_int)1000;
358	curtime += (u_int)tb.millitm;
359	}
360	#else
361	#ifdef VBOX
362	static void updtime(PNATState pData)
363	#else /* !VBOX */
364	static void updtime(void)
365	#endif /* !VBOX */
366	{
367	gettimeofday(&tt, 0);
368
369	curtime = (u_int)tt.tv_sec * (u_int)1000;
370	curtime += (u_int)tt.tv_usec / (u_int)1000;
371
372	if ((tt.tv_usec % 1000) >= 500)
373	curtime++;
374	}
375	#endif
376
377	#ifdef VBOX
378	void slirp_select_fill(PNATState pData, int *pnfds,
379	fd_set readfds, fd_set writefds, fd_set *xfds)
380	#else /* !VBOX */
381	void slirp_select_fill(int *pnfds,
382	fd_set readfds, fd_set writefds, fd_set *xfds)
383	#endif /* !VBOX */
384	{
385	struct socket so, so_next;
386	struct timeval timeout;
387	int nfds;
388	int tmp_time;
389
390	#ifndef VBOX
391	/* fail safe */
392	global_readfds = NULL;
393	global_writefds = NULL;
394	global_xfds = NULL;
395	#endif /* !VBOX */
396
397	nfds = *pnfds;
398	/*
399	* First, TCP sockets
400	*/
401	do_slowtimo = 0;
402	if (link_up) {
403	/*
404	* *_slowtimo needs calling if there are IP fragments
405	* in the fragment queue, or there are TCP connections active
406	*/
407	do_slowtimo = ((tcb.so_next != &tcb) \|\|
408	((struct ipasfrag )&ipq != u32_to_ptr(ipq.next, struct ipasfrag )));
409
410	for (so = tcb.so_next; so != &tcb; so = so_next) {
411	so_next = so->so_next;
412
413	/*
414	* See if we need a tcp_fasttimo
415	*/
416	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
417	time_fasttimo = curtime; /* Flag when we want a fasttimo */
418
419	/*
420	* NOFDREF can include still connecting to local-host,
421	* newly socreated() sockets etc. Don't want to select these.
422	*/
423	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
424	continue;
425
426	/*
427	* Set for reading sockets which are accepting
428	*/
429	if (so->so_state & SS_FACCEPTCONN) {
430	FD_SET(so->s, readfds);
431	UPD_NFDS(so->s);
432	continue;
433	}
434
435	/*
436	* Set for writing sockets which are connecting
437	*/
438	if (so->so_state & SS_ISFCONNECTING) {
439	FD_SET(so->s, writefds);
440	UPD_NFDS(so->s);
441	continue;
442	}
443
444	/*
445	* Set for writing if we are connected, can send more, and
446	* we have something to send
447	*/
448	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
449	FD_SET(so->s, writefds);
450	UPD_NFDS(so->s);
451	}
452
453	/*
454	* Set for reading (and urgent data) if we are connected, can
455	* receive more, and we have room for it XXX /2 ?
456	*/
457	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
458	FD_SET(so->s, readfds);
459	FD_SET(so->s, xfds);
460	UPD_NFDS(so->s);
461	}
462	}
463
464	/*
465	* UDP sockets
466	*/
467	for (so = udb.so_next; so != &udb; so = so_next) {
468	so_next = so->so_next;
469
470	/*
471	* See if it's timed out
472	*/
473	if (so->so_expire) {
474	if (so->so_expire <= curtime) {
475	#ifdef VBOX
476	udp_detach(pData, so);
477	#else /* !VBOX */
478	udp_detach(so);
479	#endif /* !VBOX */
480	continue;
481	} else
482	do_slowtimo = 1; /* Let socket expire */
483	}
484
485	/*
486	* When UDP packets are received from over the
487	* link, they're sendto()'d straight away, so
488	* no need for setting for writing
489	* Limit the number of packets queued by this session
490	* to 4. Note that even though we try and limit this
491	* to 4 packets, the session could have more queued
492	* if the packets needed to be fragmented
493	* (XXX <= 4 ?)
494	*/
495	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
496	FD_SET(so->s, readfds);
497	UPD_NFDS(so->s);
498	}
499	}
500	}
501
502	/*
503	* Setup timeout to use minimum CPU usage, especially when idle
504	*/
505
506	/*
507	* First, see the timeout needed by *timo
508	*/
509	timeout.tv_sec = 0;
510	timeout.tv_usec = -1;
511	/*
512	* If a slowtimo is needed, set timeout to 500ms from the last
513	* slow timeout. If a fast timeout is needed, set timeout within
514	* 200ms of when it was requested.
515	*/
516	if (do_slowtimo) {
517	/* XXX + 10000 because some select()'s aren't that accurate */
518	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
519	if (timeout.tv_usec < 0)
520	timeout.tv_usec = 0;
521	else if (timeout.tv_usec > 510000)
522	timeout.tv_usec = 510000;
523
524	/* Can only fasttimo if we also slowtimo */
525	if (time_fasttimo) {
526	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
527	if (tmp_time < 0)
528	tmp_time = 0;
529
530	/* Choose the smallest of the 2 */
531	if (tmp_time < timeout.tv_usec)
532	timeout.tv_usec = (u_int)tmp_time;
533	}
534	}
535	*pnfds = nfds;
536	}
537
538	#ifdef VBOX
539	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
540	#else /* !VBOX */
541	void slirp_select_poll(fd_set readfds, fd_set writefds, fd_set *xfds)
542	#endif /* !VBOX */
543	{
544	struct socket so, so_next;
545	int ret;
546
547	#ifndef VBOX
548	global_readfds = readfds;
549	global_writefds = writefds;
550	global_xfds = xfds;
551	#endif /* !VBOX */
552
553	/* Update time */
554	#ifdef VBOX
555	updtime(pData);
556	#else /* !VBOX */
557	updtime();
558	#endif /* !VBOX */
559
560	/*
561	* See if anything has timed out
562	*/
563	if (link_up) {
564	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
565	#ifdef VBOX
566	tcp_fasttimo(pData);
567	#else /* !VBOX */
568	tcp_fasttimo();
569	#endif /* !VBOX */
570	time_fasttimo = 0;
571	}
572	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
573	#ifdef VBOX
574	ip_slowtimo(pData);
575	tcp_slowtimo(pData);
576	#else /* !VBOX */
577	ip_slowtimo();
578	tcp_slowtimo();
579	#endif /* !VBOX */
580	last_slowtimo = curtime;
581	}
582	}
583
584	/*
585	* Check sockets
586	*/
587	if (link_up) {
588	/*
589	* Check TCP sockets
590	*/
591	for (so = tcb.so_next; so != &tcb; so = so_next) {
592	so_next = so->so_next;
593
594	/*
595	* FD_ISSET is meaningless on these sockets
596	* (and they can crash the program)
597	*/
598	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
599	continue;
600
601	/*
602	* Check for URG data
603	* This will soread as well, so no need to
604	* test for readfds below if this succeeds
605	*/
606	if (FD_ISSET(so->s, xfds))
607	#ifdef VBOX
608	sorecvoob(pData, so);
609	#else /* !VBOX */
610	sorecvoob(so);
611	#endif /* !VBOX */
612	/*
613	* Check sockets for reading
614	*/
615	else if (FD_ISSET(so->s, readfds)) {
616	/*
617	* Check for incoming connections
618	*/
619	if (so->so_state & SS_FACCEPTCONN) {
620	#ifdef VBOX
621	tcp_connect(pData, so);
622	#else /* !VBOX */
623	tcp_connect(so);
624	#endif /* !VBOX */
625	continue;
626	} /* else */
627	#ifdef VBOX
628	ret = soread(pData, so);
629	#else /* !VBOX */
630	ret = soread(so);
631	#endif /* !VBOX */
632
633	/* Output it if we read something */
634	if (ret > 0)
635	#ifdef VBOX
636	tcp_output(pData, sototcpcb(so));
637	#else /* !VBOX */
638	tcp_output(sototcpcb(so));
639	#endif /* !VBOX */
640	}
641
642	/*
643	* Check sockets for writing
644	*/
645	if (FD_ISSET(so->s, writefds)) {
646	/*
647	* Check for non-blocking, still-connecting sockets
648	*/
649	if (so->so_state & SS_ISFCONNECTING) {
650	/* Connected */
651	so->so_state &= ~SS_ISFCONNECTING;
652
653	ret = send(so->s, &ret, 0, 0);
654	if (ret < 0) {
655	/* XXXXX Must fix, zero bytes is a NOP */
656	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
657	errno == EINPROGRESS \|\| errno == ENOTCONN)
658	continue;
659
660	/* else failed */
661	so->so_state = SS_NOFDREF;
662	}
663	/* else so->so_state &= ~SS_ISFCONNECTING; */
664
665	/*
666	* Continue tcp_input
667	*/
668	#ifdef VBOX
669	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
670	#else /* !VBOX */
671	tcp_input((struct mbuf *)NULL, sizeof(struct ip), so);
672	#endif /* !VBOX */
673	/* continue; */
674	} else
675	#ifdef VBOX
676	ret = sowrite(pData, so);
677	#else /* !VBOX */
678	ret = sowrite(so);
679	#endif /* !VBOX */
680	/*
681	* XXXXX If we wrote something (a lot), there
682	* could be a need for a window update.
683	* In the worst case, the remote will send
684	* a window probe to get things going again
685	*/
686	}
687
688	/*
689	* Probe a still-connecting, non-blocking socket
690	* to check if it's still alive
691	*/
692	#ifdef PROBE_CONN
693	if (so->so_state & SS_ISFCONNECTING) {
694	ret = recv(so->s, (char *)&ret, 0,0);
695
696	if (ret < 0) {
697	/* XXX */
698	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
699	errno == EINPROGRESS \|\| errno == ENOTCONN)
700	continue; /* Still connecting, continue */
701
702	/* else failed */
703	so->so_state = SS_NOFDREF;
704
705	/* tcp_input will take care of it */
706	} else {
707	ret = send(so->s, &ret, 0,0);
708	if (ret < 0) {
709	/* XXX */
710	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
711	errno == EINPROGRESS \|\| errno == ENOTCONN)
712	continue;
713	/* else failed */
714	so->so_state = SS_NOFDREF;
715	} else
716	so->so_state &= ~SS_ISFCONNECTING;
717
718	}
719	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
720	} /* SS_ISFCONNECTING */
721	#endif
722	}
723
724	/*
725	* Now UDP sockets.
726	* Incoming packets are sent straight away, they're not buffered.
727	* Incoming UDP data isn't buffered either.
728	*/
729	for (so = udb.so_next; so != &udb; so = so_next) {
730	so_next = so->so_next;
731
732	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
733	#ifdef VBOX
734	sorecvfrom(pData, so);
735	#else /* !VBOX */
736	sorecvfrom(so);
737	#endif /* !VBOX */
738	}
739	}
740	}
741
742	/*
743	* See if we can start outputting
744	*/
745	if (if_queued && link_up)
746	#ifdef VBOX
747	if_start(pData);
748	#else /* !VBOX */
749	if_start();
750	#endif /* !VBOX */
751
752	#ifndef VBOX
753	/* clear global file descriptor sets.
754	* these reside on the stack in vl.c
755	* so they're unusable if we're not in
756	* slirp_select_fill or slirp_select_poll.
757	*/
758	global_readfds = NULL;
759	global_writefds = NULL;
760	global_xfds = NULL;
761	#endif /* !VBOX */
762	}
763
764	#define ETH_ALEN 6
765	#define ETH_HLEN 14
766
767	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
768	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
769
770	#define ARPOP_REQUEST 1 /* ARP request */
771	#define ARPOP_REPLY 2 /* ARP reply */
772
773	struct ethhdr
774	{
775	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
776	unsigned char h_source[ETH_ALEN]; /* source ether addr */
777	unsigned short h_proto; /* packet type ID field */
778	};
779
780	struct arphdr
781	{
782	unsigned short ar_hrd; /* format of hardware address */
783	unsigned short ar_pro; /* format of protocol address */
784	unsigned char ar_hln; /* length of hardware address */
785	unsigned char ar_pln; /* length of protocol address */
786	unsigned short ar_op; /* ARP opcode (command) */
787
788	/*
789	* Ethernet looks like this : This bit is variable sized however...
790	*/
791	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
792	unsigned char ar_sip[4]; /* sender IP address */
793	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
794	unsigned char ar_tip[4]; /* target IP address */
795	};
796
797	#ifdef VBOX
798	static
799	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
800	#else /* !VBOX */
801	void arp_input(const uint8_t *pkt, int pkt_len)
802	#endif /* !VBOX */
803	{
804	struct ethhdr eh = (struct ethhdr )pkt;
805	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
806	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
807	struct ethhdr reh = (struct ethhdr )arp_reply;
808	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
809	int ar_op;
810	struct ex_list *ex_ptr;
811
812	ar_op = ntohs(ah->ar_op);
813	switch(ar_op) {
814	case ARPOP_REQUEST:
815	if (!memcmp(ah->ar_tip, &special_addr, 3)) {
816	if (ah->ar_tip[3] == CTL_DNS \|\| ah->ar_tip[3] == CTL_ALIAS)
817	goto arp_ok;
818	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
819	if (ex_ptr->ex_addr == ah->ar_tip[3])
820	goto arp_ok;
821	}
822	return;
823	arp_ok:
824	/* XXX: make an ARP request to have the client address */
825	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
826
827	/* ARP request for alias/dns mac address */
828	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
829	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
830	reh->h_source[5] = ah->ar_tip[3];
831	reh->h_proto = htons(ETH_P_ARP);
832
833	rah->ar_hrd = htons(1);
834	rah->ar_pro = htons(ETH_P_IP);
835	rah->ar_hln = ETH_ALEN;
836	rah->ar_pln = 4;
837	rah->ar_op = htons(ARPOP_REPLY);
838	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
839	memcpy(rah->ar_sip, ah->ar_tip, 4);
840	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
841	memcpy(rah->ar_tip, ah->ar_sip, 4);
842	#ifdef VBOX
843	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
844	#else /* !VBOX */
845	slirp_output(arp_reply, sizeof(arp_reply));
846	#endif /* !VBOX */
847	}
848	break;
849	default:
850	break;
851	}
852	}
853
854	#ifdef VBOX
855	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
856	#else /* !VBOX */
857	void slirp_input(const uint8_t *pkt, int pkt_len)
858	#endif /* !VBOX */
859	{
860	struct mbuf *m;
861	int proto;
862
863	if (pkt_len < ETH_HLEN)
864	return;
865
866	proto = ntohs((uint16_t )(pkt + 12));
867	switch(proto) {
868	case ETH_P_ARP:
869	#ifdef VBOX
870	arp_input(pData, pkt, pkt_len);
871	#else /* !VBOX */
872	arp_input(pkt, pkt_len);
873	#endif /* !VBOX */
874	break;
875	case ETH_P_IP:
876	#ifdef VBOX
877	m = m_get(pData);
878	#else /* !VBOX */
879	m = m_get();
880	#endif /* !VBOX */
881	if (!m)
882	return;
883	/* Note: we add to align the IP header */
884	m->m_len = pkt_len + 2;
885	memcpy(m->m_data + 2, pkt, pkt_len);
886
887	m->m_data += 2 + ETH_HLEN;
888	m->m_len -= 2 + ETH_HLEN;
889
890	#ifdef VBOX
891	ip_input(pData, m);
892	#else /* !VBOX */
893	ip_input(m);
894	#endif /* !VBOX */
895	break;
896	default:
897	break;
898	}
899	}
900
901	/* output the IP packet to the ethernet device */
902	#ifdef VBOX
903	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
904	#else /* !VBOX */
905	void if_encap(const uint8_t *ip_data, int ip_data_len)
906	#endif /* !VBOX */
907	{
908	uint8_t buf[1600];
909	struct ethhdr eh = (struct ethhdr )buf;
910
911	if (ip_data_len + ETH_HLEN > sizeof(buf))
912	return;
913
914	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
915	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
916	/* XXX: not correct */
917	eh->h_source[5] = CTL_ALIAS;
918	eh->h_proto = htons(ETH_P_IP);
919	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
920	#ifdef VBOX
921	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
922	#else /* !VBOX */
923	slirp_output(buf, ip_data_len + ETH_HLEN);
924	#endif /* !VBOX */
925	}
926
927	int slirp_redir(PNATState pData, int is_udp, int host_port,
928	struct in_addr guest_addr, int guest_port)
929	{
930	if (is_udp) {
931	#ifdef VBOX
932	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
933	htons(guest_port), 0))
934	#else /* !VBOX */
935	if (!udp_listen(htons(host_port), guest_addr.s_addr,
936	htons(guest_port), 0))
937	#endif /* !VBOX */
938	return -1;
939	} else {
940	#ifdef VBOX
941	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
942	htons(guest_port), 0))
943	#else /* !VBOX */
944	if (!solisten(htons(host_port), guest_addr.s_addr,
945	htons(guest_port), 0))
946	#endif /* !VBOX */
947	return -1;
948	}
949	return 0;
950	}
951
952	#ifdef VBOX
953	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
954	int guest_port)
955	#else /* !VBOX */
956	int slirp_add_exec(int do_pty, const char *args, int addr_low_byte,
957	int guest_port)
958	#endif /* !VBOX */
959	{
960	return add_exec(&exec_list, do_pty, (char *)args,
961	addr_low_byte, htons(guest_port));
962	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 1036

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