slirp.c@ 14129

Last change on this file since 14129 was 14129, checked in by vboxsync, 16 years ago
correct definition and declaration of slirp_register_event
Property svn:eol-style set to `native`
File size: 26.6 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, bool fVerbose,
16	struct in_addr *pdns_addr,
17	const char **ppszDomain)
18	{
19	int rc = 0;
20	FIXED_INFO *FixedInfo=NULL;
21	ULONG BufLen;
22	DWORD ret;
23	IP_ADDR_STRING *pIPAddr;
24	struct in_addr tmp_addr;
25
26	FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
27	BufLen = sizeof(FIXED_INFO);
28
29	/** @todo: this API returns all DNS servers, no matter whether the
30	* corresponding network adapter is disabled or not. Maybe replace
31	* this by GetAdapterAddresses(), which is XP/Vista only though. */
32	if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
33	if (FixedInfo) {
34	GlobalFree(FixedInfo);
35	FixedInfo = NULL;
36	}
37	FixedInfo = GlobalAlloc(GPTR, BufLen);
38	}
39
40	if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
41	Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
42	if (FixedInfo) {
43	GlobalFree(FixedInfo);
44	FixedInfo = NULL;
45	}
46	rc = -1;
47	goto get_dns_prefix;
48	}
49
50	pIPAddr = &(FixedInfo->DnsServerList);
51	inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
52	Log(("nat: DNS Servers:\n"));
53	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
54	LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
55	*pdns_addr = tmp_addr;
56
57	pIPAddr = FixedInfo -> DnsServerList.Next;
58	while ( pIPAddr )
59	{
60	if (fVerbose)
61	LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
62	pIPAddr = pIPAddr ->Next;
63	}
64	if (FixedInfo) {
65	GlobalFree(FixedInfo);
66	FixedInfo = NULL;
67	}
68
69	get_dns_prefix:
70	if (ppszDomain)
71	{
72	OSVERSIONINFO ver;
73	char szDnsDomain[256];
74	DWORD dwSize = sizeof(szDnsDomain);
75
76	*ppszDomain = NULL;
77	GetVersionEx(&ver);
78	if (ver.dwMajorVersion >= 5)
79	{
80	/* GetComputerNameEx exists in Windows versions starting with 2000. */
81	if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
82	{
83	if (szDnsDomain[0])
84	{
85	/* Just non-empty strings are valid. */
86	*ppszDomain = RTStrDup(szDnsDomain);
87	if (pData->fPassDomain)
88	{
89	if (fVerbose)
90	LogRel(("NAT: passing domain name %s\n", szDnsDomain));
91	}
92	else
93	Log(("nat: ignoring domain %s\n", szDnsDomain));
94	}
95	}
96	else
97	Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
98	}
99	}
100	return rc;
101	}
102
103	#else
104
105	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
106	struct in_addr *pdns_addr,
107	const char **ppszDomain)
108	{
109	char buff[512];
110	char buff2[256];
111	FILE *f;
112	int found = 0;
113	struct in_addr tmp_addr;
114
115	#ifdef RT_OS_OS2
116	/* Try various locations. */
117	char *etc = getenv("ETC");
118	f = NULL;
119	if (etc)
120	{
121	snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
122	f = fopen(buff, "rt");
123	}
124	if (!f) {
125	snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
126	f = fopen(buff, "rt");
127	}
128	if (!f) {
129	snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
130	f = fopen(buff, "rt");
131	}
132	#else
133	f = fopen("/etc/resolv.conf", "r");
134	#endif
135	if (!f)
136	return -1;
137
138	if (ppszDomain)
139	*ppszDomain = NULL;
140	Log(("nat: DNS Servers:\n"));
141	while (fgets(buff, 512, f) != NULL) {
142	if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
143	if (!inet_aton(buff2, &tmp_addr))
144	continue;
145	if (tmp_addr.s_addr == loopback_addr.s_addr)
146	tmp_addr = our_addr;
147	/* If it's the first one, set it to dns_addr */
148	if (!found)
149	{
150	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
151	LogRel(("NAT: DNS address: %s\n", buff2));
152	*pdns_addr = tmp_addr;
153	}
154	else
155	{
156	if (fVerbose)
157	LogRel(("NAT: ignored DNS address: %s\n", buff2));
158	}
159	found++;
160	}
161	if ( ppszDomain
162	&& (!strncmp(buff, "domain", 6) \|\| !strncmp(buff, "search", 6)))
163	{
164	/* Domain name/search list present. Pick first entry */
165	if (*ppszDomain == NULL)
166	{
167	char *tok;
168	char *saveptr;
169	tok = strtok_r(&buff[6], " \t\n", &saveptr);
170	if (tok)
171	{
172	*ppszDomain = RTStrDup(tok);
173	if (pData->fPassDomain)
174	{
175	if (fVerbose)
176	LogRel(("NAT: passing domain name %s\n", tok));
177	}
178	else
179	Log(("nat: ignoring domain %s\n", tok));
180	}
181	}
182	}
183	}
184	fclose(f);
185	if (!found)
186	return -1;
187	return 0;
188	}
189
190	#endif
191
192	int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
193	{
194	return get_dns_addr_domain(pData, false, pdns_addr, NULL);
195	}
196
197	int slirp_init(PNATState ppData, const char pszNetAddr, uint32_t u32Netmask,
198	bool fPassDomain, const char *pszTFTPPrefix,
199	const char pszBootFile, void pvUser)
200	{
201	int fNATfailed = 0;
202	PNATState pData = malloc(sizeof(NATState));
203	*ppData = pData;
204	if (!pData)
205	return VERR_NO_MEMORY;
206	if (u32Netmask & 0x1f)
207	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
208	return VERR_INVALID_PARAMETER;
209	memset(pData, '\0', sizeof(NATState));
210	pData->fPassDomain = fPassDomain;
211	pData->pvUser = pvUser;
212	#if ARCH_BITS == 64
213	pData->cpvHashUsed = 1;
214	#endif
215	tftp_prefix = pszTFTPPrefix;
216	bootp_filename = pszBootFile;
217	pData->netmask = u32Netmask;
218
219	#ifdef _WIN32
220	{
221	WSADATA Data;
222	WSAStartup(MAKEWORD(2,0), &Data);
223	}
224	#ifdef VBOX_WITH_SIMPLEFIED_SLIRP_SYNC
225	/XXX:probably should be configurable/
226	pData->cMaxEvent = 256;
227	pData->phEvents = malloc(sizeof(HANDLE) * pData->cMaxEvent);
228	#endif
229	#endif
230
231	Assert(sizeof(struct ip) == 20);
232	link_up = 1;
233
234	if_init(pData);
235	ip_init(pData);
236
237	/* Initialise mbufs after setting the MTU */
238	m_init(pData);
239
240	/* set default addresses */
241	inet_aton("127.0.0.1", &loopback_addr);
242	inet_aton("127.0.0.1", &dns_addr);
243
244	if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
245	fNATfailed = 1;
246
247	inet_aton(pszNetAddr, &special_addr);
248	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
249	getouraddr(pData);
250	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
251	}
252
253	/**
254	* Marks the link as up, making it possible to establish new connections.
255	*/
256	void slirp_link_up(PNATState pData)
257	{
258	link_up = 1;
259	}
260
261	/**
262	* Marks the link as down and cleans up the current connections.
263	*/
264	void slirp_link_down(PNATState pData)
265	{
266	struct socket *so;
267
268	while ((so = tcb.so_next) != &tcb)
269	{
270	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
271	sofree(pData, so);
272	else
273	tcp_drop(pData, sototcpcb(so), 0);
274	}
275
276	while ((so = udb.so_next) != &udb)
277	udp_detach(pData, so);
278
279	link_up = 0;
280	}
281
282	/**
283	* Terminates the slirp component.
284	*/
285	void slirp_term(PNATState pData)
286	{
287	if (pData->pszDomain)
288	RTStrFree((char )(void )pData->pszDomain);
289
290	#if ARCH_BITS == 64
291	LogRel(("NAT: cpvHashUsed=%RU32 cpvHashCollisions=%RU32 cpvHashInserts=%RU64 cpvHashDone=%RU64\n",
292	pData->cpvHashUsed, pData->cpvHashCollisions, pData->cpvHashInserts, pData->cpvHashDone));
293	#endif
294
295	slirp_link_down(pData);
296	#ifdef WIN32
297	WSACleanup();
298	#endif
299	#ifdef LOG_ENABLED
300	Log(("\n"
301	"NAT statistics\n"
302	"--------------\n"
303	"\n"));
304	ipstats(pData);
305	tcpstats(pData);
306	udpstats(pData);
307	icmpstats(pData);
308	mbufstats(pData);
309	sockstats(pData);
310	Log(("\n"
311	"\n"
312	"\n"));
313	#endif
314	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
315	free(pData->phEvents);
316	#endif
317	free(pData);
318	}
319
320
321	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
322	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
323	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
324
325	/*
326	* curtime kept to an accuracy of 1ms
327	*/
328	#ifdef _WIN32
329	static void updtime(PNATState pData)
330	{
331	struct _timeb tb;
332
333	_ftime(&tb);
334	curtime = (u_int)tb.time * (u_int)1000;
335	curtime += (u_int)tb.millitm;
336	}
337	#else
338	static void updtime(PNATState pData)
339	{
340	gettimeofday(&tt, 0);
341
342	curtime = (u_int)tt.tv_sec * (u_int)1000;
343	curtime += (u_int)tt.tv_usec / (u_int)1000;
344
345	if ((tt.tv_usec % 1000) >= 500)
346	curtime++;
347	}
348	#endif
349
350	void slirp_select_fill(PNATState pData, int *pnfds,
351	fd_set readfds, fd_set writefds, fd_set *xfds)
352	{
353	struct socket so, so_next;
354	struct timeval timeout;
355	int nfds;
356	int tmp_time;
357	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
358	int rc;
359	/* Number of valid entries.
360	* 1st event for drvNATSend() */
361	int cElements;
362	int cEvents = 1;
363	#endif
364
365	nfds = *pnfds;
366	/*
367	* First, TCP sockets
368	*/
369	do_slowtimo = 0;
370	if (link_up) {
371	/*
372	* *_slowtimo needs calling if there are IP fragments
373	* in the fragment queue, or there are TCP connections active
374	*/
375	do_slowtimo = ((tcb.so_next != &tcb) \|\|
376	((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
377
378	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
379	/*
380	* Make this array static with a fixed maximum
381	* 1st event for drvNATSend()
382	*/
383	cElements = 1;
384	#endif
385
386	for (so = tcb.so_next; so != &tcb; so = so_next) {
387	so_next = so->so_next;
388
389	/*
390	* See if we need a tcp_fasttimo
391	*/
392	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
393	time_fasttimo = curtime; /* Flag when we want a fasttimo */
394
395	/*
396	* NOFDREF can include still connecting to local-host,
397	* newly socreated() sockets etc. Don't want to select these.
398	*/
399	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
400	continue;
401
402	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
403	AssertRelease(cEvents < pData->cMaxEvent);
404	WSAResetEvent(so->hNetworkEvent);
405	#endif
406	/*
407	* Set for reading sockets which are accepting
408	*/
409	if (so->so_state & SS_FACCEPTCONN) {
410	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
411	FD_SET(so->s, readfds);
412	UPD_NFDS(so->s);
413	#else
414	rc = WSAEventSelect(so->s, so->hNetworkEvent, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
415	AssertRelease(rc != SOCKET_ERROR);
416	pData->phEvents[cEvents] = so->hNetworkEvent;
417	cEvents++;
418	#endif
419	continue;
420	}
421
422	/*
423	* Set for writing sockets which are connecting
424	*/
425	if (so->so_state & SS_ISFCONNECTING) {
426	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
427	FD_SET(so->s, writefds);
428	UPD_NFDS(so->s);
429	#else
430	rc = WSAEventSelect(so->s, so->hNetworkEvent, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
431	AssertRelease(rc != SOCKET_ERROR);
432	pData->phEvents[cEvents] = so->hNetworkEvent;
433	cEvents++;
434	#endif
435	continue;
436	}
437
438	/*
439	* Set for writing if we are connected, can send more, and
440	* we have something to send
441	*/
442	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
443	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
444	FD_SET(so->s, writefds);
445	UPD_NFDS(so->s);
446	#else
447	rc = WSAEventSelect(so->s, so->hNetworkEvent, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
448	AssertRelease(rc != SOCKET_ERROR);
449	pData->phEvents[cEvents] = so->hNetworkEvent;
450	cEvents++;
451	continue; /XXX: we're using the widest mask for event/
452	#endif
453	}
454
455	/*
456	* Set for reading (and urgent data) if we are connected, can
457	* receive more, and we have room for it XXX /2 ?
458	*/
459	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
460	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
461	FD_SET(so->s, readfds);
462	FD_SET(so->s, xfds);
463	UPD_NFDS(so->s);
464	#else
465	rc = WSAEventSelect(so->s, so->hNetworkEvent, FD_OOB\|FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT);
466	AssertRelease(rc != SOCKET_ERROR);
467	pData->phEvents[cEvents] = so->hNetworkEvent;
468	cEvents++;
469	continue; /XXX: we're using the widest mask for event/
470	#endif
471	}
472	}
473
474	/*
475	* UDP sockets
476	*/
477	for (so = udb.so_next; so != &udb; so = so_next) {
478	so_next = so->so_next;
479
480	/*
481	* See if it's timed out
482	*/
483	if (so->so_expire) {
484	if (so->so_expire <= curtime) {
485	udp_detach(pData, so);
486	continue;
487	} else
488	do_slowtimo = 1; /* Let socket expire */
489	}
490
491	/*
492	* When UDP packets are received from over the
493	* link, they're sendto()'d straight away, so
494	* no need for setting for writing
495	* Limit the number of packets queued by this session
496	* to 4. Note that even though we try and limit this
497	* to 4 packets, the session could have more queued
498	* if the packets needed to be fragmented
499	* (XXX <= 4 ?)
500	*/
501	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
502	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
503	FD_SET(so->s, readfds);
504	UPD_NFDS(so->s);
505	#else
506	WSAResetEvent(so->hNetworkEvent);
507	AssertRelease(cEvents < pData->cMaxEvent);
508	rc = WSAEventSelect(so->s, so->hNetworkEvent, FD_READ\|FD_WRITE\|FD_OOB\|FD_ACCEPT);
509	AssertRelease(rc != SOCKET_ERROR);
510	pData->phEvents[cEvents] = so->hNetworkEvent;
511	cEvents++;
512	#endif
513	}
514	}
515	}
516
517	/*
518	* Setup timeout to use minimum CPU usage, especially when idle
519	*/
520
521	/*
522	* First, see the timeout needed by *timo
523	*/
524	timeout.tv_sec = 0;
525	timeout.tv_usec = -1;
526	/*
527	* If a slowtimo is needed, set timeout to 500ms from the last
528	* slow timeout. If a fast timeout is needed, set timeout within
529	* 200ms of when it was requested.
530	*/
531	if (do_slowtimo) {
532	/* XXX + 10000 because some select()'s aren't that accurate */
533	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
534	if (timeout.tv_usec < 0)
535	timeout.tv_usec = 0;
536	else if (timeout.tv_usec > 510000)
537	timeout.tv_usec = 510000;
538
539	/* Can only fasttimo if we also slowtimo */
540	if (time_fasttimo) {
541	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
542	if (tmp_time < 0)
543	tmp_time = 0;
544
545	/* Choose the smallest of the 2 */
546	if (tmp_time < timeout.tv_usec)
547	timeout.tv_usec = (u_int)tmp_time;
548	}
549	}
550	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
551	*pnfds = nfds;
552	#else
553	*pnfds = cEvents;
554	#endif
555	}
556
557	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
558	{
559	struct socket so, so_next;
560	int ret;
561	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
562	WSANETWORKEVENTS NetworkEvents;
563	int rc;
564	int timer_update = (readfds == NULL && writefds == NULL && xfds == NULL);
565	#endif
566
567	/* Update time */
568	updtime(pData);
569
570	/*
571	* See if anything has timed out
572	*/
573	if (link_up) {
574	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
575	tcp_fasttimo(pData);
576	time_fasttimo = 0;
577	}
578	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
579	ip_slowtimo(pData);
580	tcp_slowtimo(pData);
581	last_slowtimo = curtime;
582	}
583	}
584	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
585	if (timer_update) return;
586	#endif
587
588	/*
589	* Check sockets
590	*/
591	if (link_up) {
592	/*
593	* Check TCP sockets
594	*/
595	for (so = tcb.so_next; so != &tcb; so = so_next) {
596	so_next = so->so_next;
597
598	/*
599	* FD_ISSET is meaningless on these sockets
600	* (and they can crash the program)
601	*/
602	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
603	continue;
604	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
605	rc = WSAEnumNetworkEvents(so->s, so->hNetworkEvent, &NetworkEvents);
606	AssertRelease(rc != SOCKET_ERROR);
607	#endif
608
609	/*
610	* Check for URG data
611	* This will soread as well, so no need to
612	* test for readfds below if this succeeds
613	*/
614	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
615	if (FD_ISSET(so->s, xfds))
616	#else
617	if ((NetworkEvents.lNetworkEvents & FD_OOB) && NetworkEvents.iErrorCode[FD_OOB_BIT] == 0)
618	#endif
619	sorecvoob(pData, so);
620	/*
621	* Check sockets for reading
622	*/
623	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
624	else if (FD_ISSET(so->s, readfds)) {
625	#else
626	else if ((NetworkEvents.lNetworkEvents & FD_READ) && (NetworkEvents.iErrorCode[FD_READ_BIT] == 0)) {
627	#endif
628	/*
629	* Check for incoming connections
630	*/
631	if (so->so_state & SS_FACCEPTCONN) {
632	tcp_connect(pData, so);
633	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
634	WSAResetEvent(so->hNetworkEvent);
635	#endif
636	continue;
637	} /* else */
638	ret = soread(pData, so);
639
640	/* Output it if we read something */
641	if (ret > 0)
642	tcp_output(pData, sototcpcb(so));
643	}
644
645	/*
646	* Check sockets for writing
647	*/
648	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
649	if (FD_ISSET(so->s, writefds)) {
650	#else
651	if ((NetworkEvents.lNetworkEvents & FD_WRITE) && (NetworkEvents.iErrorCode[FD_WRITE_BIT] == 0)) {
652	#endif
653	/*
654	* Check for non-blocking, still-connecting sockets
655	*/
656	if (so->so_state & SS_ISFCONNECTING) {
657	/* Connected */
658	so->so_state &= ~SS_ISFCONNECTING;
659
660	/*
661	* This should be probably guarded by PROBE_CONN too. Anyway,
662	* we disable it on OS/2 because the below send call returns
663	* EFAULT which causes the opened TCP socket to close right
664	* after it has been opened and connected.
665	*/
666	#ifndef RT_OS_OS2
667	ret = send(so->s, (const char *)&ret, 0, 0);
668	if (ret < 0) {
669	/* XXXXX Must fix, zero bytes is a NOP */
670	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
671	errno == EINPROGRESS \|\| errno == ENOTCONN) {
672	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
673	WSAResetEvent(so->hNetworkEvent);
674	#endif
675	continue;
676	}
677
678	/* else failed */
679	so->so_state = SS_NOFDREF;
680	}
681	/* else so->so_state &= ~SS_ISFCONNECTING; */
682	#endif
683
684	/*
685	* Continue tcp_input
686	*/
687	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
688	/* continue; */
689	} else
690	ret = sowrite(pData, so);
691	/*
692	* XXXXX If we wrote something (a lot), there
693	* could be a need for a window update.
694	* In the worst case, the remote will send
695	* a window probe to get things going again
696	*/
697	}
698
699	/*
700	* Probe a still-connecting, non-blocking socket
701	* to check if it's still alive
702	*/
703	#ifdef PROBE_CONN
704	if (so->so_state & SS_ISFCONNECTING) {
705	ret = recv(so->s, (char *)&ret, 0,0);
706
707	if (ret < 0) {
708	/* XXX */
709	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
710	errno == EINPROGRESS \|\| errno == ENOTCONN) {
711	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
712	WSAResetEvent(so->hNetworkEvent);
713	#endif
714	continue; /* Still connecting, continue */
715	}
716
717	/* else failed */
718	so->so_state = SS_NOFDREF;
719
720	/* tcp_input will take care of it */
721	} else {
722	ret = send(so->s, &ret, 0,0);
723	if (ret < 0) {
724	/* XXX */
725	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
726	errno == EINPROGRESS \|\| errno == ENOTCONN) {
727	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
728	WSAResetEvent(so->hNetworkEvent);
729	#endif
730	continue;
731	}
732	/* else failed */
733	so->so_state = SS_NOFDREF;
734	} else
735	so->so_state &= ~SS_ISFCONNECTING;
736
737	}
738	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
739	} /* SS_ISFCONNECTING */
740	#endif
741	}
742
743	/*
744	* Now UDP sockets.
745	* Incoming packets are sent straight away, they're not buffered.
746	* Incoming UDP data isn't buffered either.
747	*/
748	for (so = udb.so_next; so != &udb; so = so_next) {
749	so_next = so->so_next;
750
751	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
752	rc = WSAEnumNetworkEvents(so->s, so->hNetworkEvent, &NetworkEvents);
753	AssertRelease(rc != SOCKET_ERROR);
754	#endif
755	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
756	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
757	#else
758	if ((NetworkEvents.lNetworkEvents & FD_READ) && (NetworkEvents.iErrorCode[FD_READ_BIT] == 0)) {
759	#endif
760	sorecvfrom(pData, so);
761	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
762	WSAResetEvent(so->hNetworkEvent);
763	#endif
764	}
765	}
766	}
767
768	/*
769	* See if we can start outputting
770	*/
771	if (if_queued && link_up)
772	if_start(pData);
773	}
774
775	#define ETH_ALEN 6
776	#define ETH_HLEN 14
777
778	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
779	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
780
781	#define ARPOP_REQUEST 1 /* ARP request */
782	#define ARPOP_REPLY 2 /* ARP reply */
783
784	struct ethhdr
785	{
786	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
787	unsigned char h_source[ETH_ALEN]; /* source ether addr */
788	unsigned short h_proto; /* packet type ID field */
789	};
790
791	struct arphdr
792	{
793	unsigned short ar_hrd; /* format of hardware address */
794	unsigned short ar_pro; /* format of protocol address */
795	unsigned char ar_hln; /* length of hardware address */
796	unsigned char ar_pln; /* length of protocol address */
797	unsigned short ar_op; /* ARP opcode (command) */
798
799	/*
800	* Ethernet looks like this : This bit is variable sized however...
801	*/
802	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
803	unsigned char ar_sip[4]; /* sender IP address */
804	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
805	unsigned char ar_tip[4]; /* target IP address */
806	};
807
808	static
809	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
810	{
811	struct ethhdr eh = (struct ethhdr )pkt;
812	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
813	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
814	struct ethhdr reh = (struct ethhdr )arp_reply;
815	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
816	int ar_op;
817	struct ex_list *ex_ptr;
818	uint32_t htip = ntohl((uint32_t)ah->ar_tip);
819
820	ar_op = ntohs(ah->ar_op);
821	switch(ar_op) {
822	case ARPOP_REQUEST:
823	if ((htip & pData->netmask) == ntohl(special_addr.s_addr)) {
824	if ( (htip & ~pData->netmask) == CTL_DNS
825	\|\| (htip & ~pData->netmask) == CTL_ALIAS)
826	goto arp_ok;
827	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
828	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
829	goto arp_ok;
830	}
831	return;
832	arp_ok:
833	/* XXX: make an ARP request to have the client address */
834	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
835
836	/* ARP request for alias/dns mac address */
837	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
838	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
839	reh->h_source[5] = ah->ar_tip[3];
840	reh->h_proto = htons(ETH_P_ARP);
841
842	rah->ar_hrd = htons(1);
843	rah->ar_pro = htons(ETH_P_IP);
844	rah->ar_hln = ETH_ALEN;
845	rah->ar_pln = 4;
846	rah->ar_op = htons(ARPOP_REPLY);
847	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
848	memcpy(rah->ar_sip, ah->ar_tip, 4);
849	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
850	memcpy(rah->ar_tip, ah->ar_sip, 4);
851	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
852	}
853	break;
854	default:
855	break;
856	}
857	}
858
859	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
860	{
861	struct mbuf *m;
862	int proto;
863
864	if (pkt_len < ETH_HLEN)
865	return;
866
867	proto = ntohs((uint16_t )(pkt + 12));
868	switch(proto) {
869	case ETH_P_ARP:
870	arp_input(pData, pkt, pkt_len);
871	break;
872	case ETH_P_IP:
873	/* Update time. Important if the network is very quiet, as otherwise
874	* the first outgoing connection gets an incorrect timestamp. */
875	updtime(pData);
876
877	m = m_get(pData);
878	if (!m)
879	return;
880	/* Note: we add to align the IP header */
881	if (M_FREEROOM(m) < pkt_len + 2) {
882	m_inc(m, pkt_len + 2);
883	}
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	ip_input(pData, m);
891	break;
892	default:
893	break;
894	}
895	}
896
897	/* output the IP packet to the ethernet device */
898	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
899	{
900	uint8_t buf[1600];
901	struct ethhdr eh = (struct ethhdr )buf;
902
903	if (ip_data_len + ETH_HLEN > sizeof(buf))
904	return;
905
906	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
907	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
908	/* XXX: not correct */
909	eh->h_source[5] = CTL_ALIAS;
910	eh->h_proto = htons(ETH_P_IP);
911	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
912	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
913	}
914
915	int slirp_redir(PNATState pData, int is_udp, int host_port,
916	struct in_addr guest_addr, int guest_port)
917	{
918	if (is_udp) {
919	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
920	htons(guest_port), 0))
921	return -1;
922	} else {
923	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
924	htons(guest_port), 0))
925	return -1;
926	}
927	return 0;
928	}
929
930	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
931	int guest_port)
932	{
933	return add_exec(&exec_list, do_pty, (char *)args,
934	addr_low_byte, htons(guest_port));
935	}
936
937	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
938	{
939	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
940	}
941
942	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
943	HANDLE *slirp_get_events(PNATState pData)
944	{
945	return (pData->phEvents);
946	}
947	void slirp_register_external_event(PNATState pData, HANDLE hEvent)
948	{
949	pData->phEvents[0] = hEvent;
950	}
951	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 14129

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