slirp.c@ 14194

Last change on this file since 14194 was 14194, checked in by vboxsync, 16 years ago
introduced new event for handling link state changings (need some testing)
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	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
225	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
226	#endif
227	#endif
228
229	Assert(sizeof(struct ip) == 20);
230	link_up = 1;
231
232	if_init(pData);
233	ip_init(pData);
234
235	/* Initialise mbufs after setting the MTU */
236	m_init(pData);
237
238	/* set default addresses */
239	inet_aton("127.0.0.1", &loopback_addr);
240	inet_aton("127.0.0.1", &dns_addr);
241
242	if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
243	fNATfailed = 1;
244
245	inet_aton(pszNetAddr, &special_addr);
246	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
247	getouraddr(pData);
248	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
249	}
250
251	/**
252	* Marks the link as up, making it possible to establish new connections.
253	*/
254	void slirp_link_up(PNATState pData)
255	{
256	link_up = 1;
257	}
258
259	/**
260	* Marks the link as down and cleans up the current connections.
261	*/
262	void slirp_link_down(PNATState pData)
263	{
264	struct socket *so;
265
266	while ((so = tcb.so_next) != &tcb)
267	{
268	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
269	sofree(pData, so);
270	else
271	tcp_drop(pData, sototcpcb(so), 0);
272	}
273
274	while ((so = udb.so_next) != &udb)
275	udp_detach(pData, so);
276
277	link_up = 0;
278	}
279
280	/**
281	* Terminates the slirp component.
282	*/
283	void slirp_term(PNATState pData)
284	{
285	if (pData->pszDomain)
286	RTStrFree((char )(void )pData->pszDomain);
287
288	#if ARCH_BITS == 64
289	LogRel(("NAT: cpvHashUsed=%RU32 cpvHashCollisions=%RU32 cpvHashInserts=%RU64 cpvHashDone=%RU64\n",
290	pData->cpvHashUsed, pData->cpvHashCollisions, pData->cpvHashInserts, pData->cpvHashDone));
291	#endif
292
293	slirp_link_down(pData);
294	#ifdef WIN32
295	WSACleanup();
296	#endif
297	#ifdef LOG_ENABLED
298	Log(("\n"
299	"NAT statistics\n"
300	"--------------\n"
301	"\n"));
302	ipstats(pData);
303	tcpstats(pData);
304	udpstats(pData);
305	icmpstats(pData);
306	mbufstats(pData);
307	sockstats(pData);
308	Log(("\n"
309	"\n"
310	"\n"));
311	#endif
312	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
313	free(pData->phEvents);
314	#endif
315	free(pData);
316	}
317
318
319	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
320	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
321	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
322
323	/*
324	* curtime kept to an accuracy of 1ms
325	*/
326	#ifdef _WIN32
327	static void updtime(PNATState pData)
328	{
329	struct _timeb tb;
330
331	_ftime(&tb);
332	curtime = (u_int)tb.time * (u_int)1000;
333	curtime += (u_int)tb.millitm;
334	}
335	#else
336	static void updtime(PNATState pData)
337	{
338	gettimeofday(&tt, 0);
339
340	curtime = (u_int)tt.tv_sec * (u_int)1000;
341	curtime += (u_int)tt.tv_usec / (u_int)1000;
342
343	if ((tt.tv_usec % 1000) >= 500)
344	curtime++;
345	}
346	#endif
347
348	void slirp_select_fill(PNATState pData, int *pnfds,
349	fd_set readfds, fd_set writefds, fd_set *xfds)
350	{
351	struct socket so, so_next;
352	struct timeval timeout;
353	int nfds;
354	int tmp_time;
355	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
356	int rc;
357	int error;
358	#endif
359
360	nfds = *pnfds;
361	/*
362	* First, TCP sockets
363	*/
364	do_slowtimo = 0;
365	if (link_up) {
366	/*
367	* *_slowtimo needs calling if there are IP fragments
368	* in the fragment queue, or there are TCP connections active
369	*/
370	do_slowtimo = ((tcb.so_next != &tcb) \|\|
371	((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
372
373	for (so = tcb.so_next; so != &tcb; so = so_next) {
374	so_next = so->so_next;
375
376	/*
377	* See if we need a tcp_fasttimo
378	*/
379	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
380	time_fasttimo = curtime; /* Flag when we want a fasttimo */
381
382	/*
383	* NOFDREF can include still connecting to local-host,
384	* newly socreated() sockets etc. Don't want to select these.
385	*/
386	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
387	continue;
388
389	/*
390	* Set for reading sockets which are accepting
391	*/
392	if (so->so_state & SS_FACCEPTCONN) {
393	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
394	FD_SET(so->s, readfds);
395	UPD_NFDS(so->s);
396	#else
397	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
398	if (rc == SOCKET_ERROR)
399	{
400	socket_error:
401	error = WSAGetLastError();
402	LogRel(("WSAEventSelector error %d (so=%x, socket=%s, event=%x)\n", error, so, so->s, VBOX_SOCKET_EVENT));
403	}
404	#endif
405	continue;
406	}
407
408	/*
409	* Set for writing sockets which are connecting
410	*/
411	if (so->so_state & SS_ISFCONNECTING) {
412	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
413	FD_SET(so->s, writefds);
414	UPD_NFDS(so->s);
415	#else
416	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
417	if (rc == SOCKET_ERROR)
418	goto socket_error;
419	#endif
420	continue;
421	}
422
423	/*
424	* Set for writing if we are connected, can send more, and
425	* we have something to send
426	*/
427	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
428	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
429	FD_SET(so->s, writefds);
430	UPD_NFDS(so->s);
431	#else
432	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
433	if (rc == SOCKET_ERROR)
434	goto socket_error;
435	continue; /XXX: we're using the widest mask for event/
436	#endif
437	}
438
439	/*
440	* Set for reading (and urgent data) if we are connected, can
441	* receive more, and we have room for it XXX /2 ?
442	*/
443	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
444	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
445	FD_SET(so->s, readfds);
446	FD_SET(so->s, xfds);
447	UPD_NFDS(so->s);
448	#else
449	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_OOB\|FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT);
450	if (rc == SOCKET_ERROR)
451	goto socket_error;
452	continue; /XXX: we're using the widest mask for event/
453	#endif
454	}
455	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
456	rc = WSAEventSelect(so->s, NULL, 0);
457	if (rc == SOCKET_ERROR)
458	goto socket_error;
459	#endif
460	}
461
462	/*
463	* UDP sockets
464	*/
465	for (so = udb.so_next; so != &udb; so = so_next) {
466	so_next = so->so_next;
467
468	/*
469	* See if it's timed out
470	*/
471	if (so->so_expire) {
472	if (so->so_expire <= curtime) {
473	udp_detach(pData, so);
474	continue;
475	} else
476	do_slowtimo = 1; /* Let socket expire */
477	}
478
479	/*
480	* When UDP packets are received from over the
481	* link, they're sendto()'d straight away, so
482	* no need for setting for writing
483	* Limit the number of packets queued by this session
484	* to 4. Note that even though we try and limit this
485	* to 4 packets, the session could have more queued
486	* if the packets needed to be fragmented
487	* (XXX <= 4 ?)
488	*/
489	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
490	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
491	FD_SET(so->s, readfds);
492	UPD_NFDS(so->s);
493	#else
494	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_OOB\|FD_ACCEPT);
495	if (rc == SOCKET_ERROR)
496	goto socket_error;
497	continue;
498	#endif
499	}
500	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
501	else
502	{
503	rc = WSAEventSelect(so->s, NULL, 0);
504	if (rc != SOCKET_ERROR)
505	goto socket_error;
506	}
507	#endif
508	}
509	}
510
511	/*
512	* Setup timeout to use minimum CPU usage, especially when idle
513	*/
514
515	/*
516	* First, see the timeout needed by *timo
517	*/
518	timeout.tv_sec = 0;
519	timeout.tv_usec = -1;
520	/*
521	* If a slowtimo is needed, set timeout to 500ms from the last
522	* slow timeout. If a fast timeout is needed, set timeout within
523	* 200ms of when it was requested.
524	*/
525	if (do_slowtimo) {
526	/* XXX + 10000 because some select()'s aren't that accurate */
527	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
528	if (timeout.tv_usec < 0)
529	timeout.tv_usec = 0;
530	else if (timeout.tv_usec > 510000)
531	timeout.tv_usec = 510000;
532
533	/* Can only fasttimo if we also slowtimo */
534	if (time_fasttimo) {
535	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
536	if (tmp_time < 0)
537	tmp_time = 0;
538
539	/* Choose the smallest of the 2 */
540	if (tmp_time < timeout.tv_usec)
541	timeout.tv_usec = (u_int)tmp_time;
542	}
543	}
544	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
545	*pnfds = nfds;
546	#else
547	*pnfds = VBOX_EVENT_COUNT;
548	#endif
549	}
550
551	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
552	{
553	struct socket so, so_next;
554	int ret;
555	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
556	WSANETWORKEVENTS NetworkEvents;
557	int rc;
558	int error;
559	int timer_update = (readfds == NULL && writefds == NULL && xfds == NULL);
560	#endif
561
562	/* Update time */
563	updtime(pData);
564
565	/*
566	* See if anything has timed out
567	*/
568	if (link_up) {
569	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
570	tcp_fasttimo(pData);
571	time_fasttimo = 0;
572	}
573	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
574	ip_slowtimo(pData);
575	tcp_slowtimo(pData);
576	last_slowtimo = curtime;
577	}
578	}
579	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
580	if (timer_update) return;
581	#endif
582
583	/*
584	* Check sockets
585	*/
586	if (link_up) {
587	/*
588	* Check TCP sockets
589	*/
590	for (so = tcb.so_next; so != &tcb; so = so_next) {
591	so_next = so->so_next;
592
593	/*
594	* FD_ISSET is meaningless on these sockets
595	* (and they can crash the program)
596	*/
597	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
598	continue;
599	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
600	rc = WSAEnumNetworkEvents(so->s, VBOX_SOCKET_EVENT, &NetworkEvents);
601	if (rc == SOCKET_ERROR)
602	{
603	error = WSAGetLastError();
604	LogRel(("WSAEnumNetworkEvents TCP error %d\n", error));
605	continue;
606	}
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	continue;
634	} /* else */
635	ret = soread(pData, so);
636
637	/* Output it if we read something */
638	if (ret > 0)
639	tcp_output(pData, sototcpcb(so));
640	}
641
642	/*
643	* Check sockets for writing
644	*/
645	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
646	if (FD_ISSET(so->s, writefds)) {
647	#else
648	if ((NetworkEvents.lNetworkEvents & FD_WRITE) && (NetworkEvents.iErrorCode[FD_WRITE_BIT] == 0)) {
649	#endif
650	/*
651	* Check for non-blocking, still-connecting sockets
652	*/
653	if (so->so_state & SS_ISFCONNECTING) {
654	/* Connected */
655	so->so_state &= ~SS_ISFCONNECTING;
656
657	/*
658	* This should be probably guarded by PROBE_CONN too. Anyway,
659	* we disable it on OS/2 because the below send call returns
660	* EFAULT which causes the opened TCP socket to close right
661	* after it has been opened and connected.
662	*/
663	#ifndef RT_OS_OS2
664	ret = send(so->s, (const char *)&ret, 0, 0);
665	if (ret < 0) {
666	/* XXXXX Must fix, zero bytes is a NOP */
667	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
668	errno == EINPROGRESS \|\| errno == ENOTCONN) {
669	continue;
670	}
671
672	/* else failed */
673	so->so_state = SS_NOFDREF;
674	}
675	/* else so->so_state &= ~SS_ISFCONNECTING; */
676	#endif
677
678	/*
679	* Continue tcp_input
680	*/
681	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
682	/* continue; */
683	} else
684	ret = sowrite(pData, so);
685	/*
686	* XXXXX If we wrote something (a lot), there
687	* could be a need for a window update.
688	* In the worst case, the remote will send
689	* a window probe to get things going again
690	*/
691	}
692
693	/*
694	* Probe a still-connecting, non-blocking socket
695	* to check if it's still alive
696	*/
697	#ifdef PROBE_CONN
698	if (so->so_state & SS_ISFCONNECTING) {
699	ret = recv(so->s, (char *)&ret, 0,0);
700
701	if (ret < 0) {
702	/* XXX */
703	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
704	errno == EINPROGRESS \|\| errno == ENOTCONN) {
705	continue; /* Still connecting, continue */
706	}
707
708	/* else failed */
709	so->so_state = SS_NOFDREF;
710
711	/* tcp_input will take care of it */
712	} else {
713	ret = send(so->s, &ret, 0,0);
714	if (ret < 0) {
715	/* XXX */
716	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
717	errno == EINPROGRESS \|\| errno == ENOTCONN) {
718	continue;
719	}
720	/* else failed */
721	so->so_state = SS_NOFDREF;
722	} else
723	so->so_state &= ~SS_ISFCONNECTING;
724
725	}
726	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
727	} /* SS_ISFCONNECTING */
728	#endif
729	}
730
731	/*
732	* Now UDP sockets.
733	* Incoming packets are sent straight away, they're not buffered.
734	* Incoming UDP data isn't buffered either.
735	*/
736	for (so = udb.so_next; so != &udb; so = so_next) {
737	so_next = so->so_next;
738
739	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
740	rc = WSAEnumNetworkEvents(so->s, VBOX_SOCKET_EVENT, &NetworkEvents);
741	if (rc == SOCKET_ERROR)
742	{
743	error = WSAGetLastError();
744	LogRel(("WSAEnumNetworkEvents TCP error %d\n", error));
745	continue;
746	}
747	#endif
748	#if !defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
749	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
750	#else
751	if ((NetworkEvents.lNetworkEvents & FD_READ) && (NetworkEvents.iErrorCode[FD_READ_BIT] == 0)) {
752	#endif
753	sorecvfrom(pData, so);
754	}
755	}
756	}
757
758	/*
759	* See if we can start outputting
760	*/
761	if (if_queued && link_up)
762	if_start(pData);
763	}
764
765	#define ETH_ALEN 6
766	#define ETH_HLEN 14
767
768	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
769	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
770
771	#define ARPOP_REQUEST 1 /* ARP request */
772	#define ARPOP_REPLY 2 /* ARP reply */
773
774	struct ethhdr
775	{
776	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
777	unsigned char h_source[ETH_ALEN]; /* source ether addr */
778	unsigned short h_proto; /* packet type ID field */
779	};
780
781	struct arphdr
782	{
783	unsigned short ar_hrd; /* format of hardware address */
784	unsigned short ar_pro; /* format of protocol address */
785	unsigned char ar_hln; /* length of hardware address */
786	unsigned char ar_pln; /* length of protocol address */
787	unsigned short ar_op; /* ARP opcode (command) */
788
789	/*
790	* Ethernet looks like this : This bit is variable sized however...
791	*/
792	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
793	unsigned char ar_sip[4]; /* sender IP address */
794	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
795	unsigned char ar_tip[4]; /* target IP address */
796	};
797
798	static
799	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
800	{
801	struct ethhdr eh = (struct ethhdr )pkt;
802	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
803	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
804	struct ethhdr reh = (struct ethhdr )arp_reply;
805	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
806	int ar_op;
807	struct ex_list *ex_ptr;
808	uint32_t htip = ntohl((uint32_t)ah->ar_tip);
809
810	ar_op = ntohs(ah->ar_op);
811	switch(ar_op) {
812	case ARPOP_REQUEST:
813	if ((htip & pData->netmask) == ntohl(special_addr.s_addr)) {
814	if ( (htip & ~pData->netmask) == CTL_DNS
815	\|\| (htip & ~pData->netmask) == CTL_ALIAS)
816	goto arp_ok;
817	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
818	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
819	goto arp_ok;
820	}
821	return;
822	arp_ok:
823	/* XXX: make an ARP request to have the client address */
824	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
825
826	/* ARP request for alias/dns mac address */
827	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
828	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
829	reh->h_source[5] = ah->ar_tip[3];
830	reh->h_proto = htons(ETH_P_ARP);
831
832	rah->ar_hrd = htons(1);
833	rah->ar_pro = htons(ETH_P_IP);
834	rah->ar_hln = ETH_ALEN;
835	rah->ar_pln = 4;
836	rah->ar_op = htons(ARPOP_REPLY);
837	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
838	memcpy(rah->ar_sip, ah->ar_tip, 4);
839	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
840	memcpy(rah->ar_tip, ah->ar_sip, 4);
841	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
842	}
843	break;
844	default:
845	break;
846	}
847	}
848
849	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
850	{
851	struct mbuf *m;
852	int proto;
853
854	if (pkt_len < ETH_HLEN)
855	return;
856
857	proto = ntohs((uint16_t )(pkt + 12));
858	switch(proto) {
859	case ETH_P_ARP:
860	arp_input(pData, pkt, pkt_len);
861	break;
862	case ETH_P_IP:
863	/* Update time. Important if the network is very quiet, as otherwise
864	* the first outgoing connection gets an incorrect timestamp. */
865	updtime(pData);
866
867	m = m_get(pData);
868	if (!m)
869	return;
870	/* Note: we add to align the IP header */
871	if (M_FREEROOM(m) < pkt_len + 2) {
872	m_inc(m, pkt_len + 2);
873	}
874	m->m_len = pkt_len + 2;
875	memcpy(m->m_data + 2, pkt, pkt_len);
876
877	m->m_data += 2 + ETH_HLEN;
878	m->m_len -= 2 + ETH_HLEN;
879
880	ip_input(pData, m);
881	break;
882	default:
883	break;
884	}
885	}
886
887	/* output the IP packet to the ethernet device */
888	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
889	{
890	uint8_t buf[1600];
891	struct ethhdr eh = (struct ethhdr )buf;
892
893	if (ip_data_len + ETH_HLEN > sizeof(buf))
894	return;
895
896	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
897	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
898	/* XXX: not correct */
899	eh->h_source[5] = CTL_ALIAS;
900	eh->h_proto = htons(ETH_P_IP);
901	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
902	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
903	}
904
905	int slirp_redir(PNATState pData, int is_udp, int host_port,
906	struct in_addr guest_addr, int guest_port)
907	{
908	if (is_udp) {
909	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
910	htons(guest_port), 0))
911	return -1;
912	} else {
913	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
914	htons(guest_port), 0))
915	return -1;
916	}
917	return 0;
918	}
919
920	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
921	int guest_port)
922	{
923	return add_exec(&exec_list, do_pty, (char *)args,
924	addr_low_byte, htons(guest_port));
925	}
926
927	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
928	{
929	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
930	}
931
932	#if defined(VBOX_WITH_SIMPLEFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
933	HANDLE *slirp_get_events(PNATState pData)
934	{
935	return pData->phEvents;
936	}
937	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
938	{
939	pData->phEvents[index] = hEvent;
940	}
941	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 14194

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