proxy.c@ 94068

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1	/* $Id: proxy.c 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* NAT Network - proxy setup and utilities.
4	*/
5
6	/*
7	* Copyright (C) 2013-2022 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	#define LOG_GROUP LOG_GROUP_NAT_SERVICE
19
20	#include "winutils.h"
21
22	#include "proxy.h"
23	#include "proxy_pollmgr.h"
24	#include "portfwd.h"
25
26	#include "lwip/opt.h"
27
28	#include "lwip/sys.h"
29	#include "lwip/tcpip.h"
30
31	#ifndef RT_OS_WINDOWS
32	#include <sys/poll.h>
33	#include <sys/socket.h>
34	#include <netinet/in.h>
35	#include <netinet/tcp.h>
36	#include <arpa/inet.h>
37	#include <fcntl.h>
38	#include <stdio.h>
39	#include <iprt/string.h>
40	#include <unistd.h>
41	#include <err.h>
42	#else
43	# include <iprt/string.h>
44	#endif
45
46	#if defined(SOCK_NONBLOCK) && defined(RT_OS_NETBSD) /* XXX: PR kern/47569 */
47	# undef SOCK_NONBLOCK
48	#endif
49
50	#ifndef __arraycount
51	# define __arraycount(a) (sizeof(a)/sizeof(a[0]))
52	#endif
53
54	static FNRTSTRFORMATTYPE proxy_sockerr_rtstrfmt;
55
56	static SOCKET proxy_create_socket(int, int);
57
58	volatile struct proxy_options *g_proxy_options;
59	static sys_thread_t pollmgr_tid;
60
61	/* XXX: for mapping loopbacks to addresses in our network (ip4) */
62	struct netif *g_proxy_netif;
63
64
65	/*
66	* Called on the lwip thread (aka tcpip thread) from tcpip_init() via
67	* its "tcpip_init_done" callback. Raw API is ok to use here
68	* (e.g. rtadvd), but netconn API is not.
69	*/
70	void
71	proxy_init(struct netif proxy_netif, struct proxy_options opts)
72	{
73	int status;
74
75	LWIP_ASSERT1(opts != NULL);
76	LWIP_UNUSED_ARG(proxy_netif);
77
78	status = RTStrFormatTypeRegister("sockerr", proxy_sockerr_rtstrfmt, NULL);
79	AssertRC(status);
80
81	g_proxy_options = opts;
82	g_proxy_netif = proxy_netif;
83
84	#if 1
85	proxy_rtadvd_start(proxy_netif);
86	#endif
87
88	/*
89	* XXX: We use stateless DHCPv6 only to report IPv6 address(es) of
90	* nameserver(s). Since we don't yet support IPv6 addresses in
91	* HostDnsService, there's no point in running DHCPv6.
92	*/
93	#if 0
94	dhcp6ds_init(proxy_netif);
95	#endif
96
97	if (opts->tftp_root != NULL) {
98	tftpd_init(proxy_netif, opts->tftp_root);
99	}
100
101	status = pollmgr_init();
102	if (status < 0) {
103	errx(EXIT_FAILURE, "failed to initialize poll manager");
104	/* NOTREACHED */
105	}
106
107	pxtcp_init();
108	pxudp_init();
109
110	portfwd_init();
111
112	pxdns_init(proxy_netif);
113
114	pxping_init(proxy_netif, opts->icmpsock4, opts->icmpsock6);
115
116	pollmgr_tid = sys_thread_new("pollmgr_thread",
117	pollmgr_thread, NULL,
118	DEFAULT_THREAD_STACKSIZE,
119	DEFAULT_THREAD_PRIO);
120	if (!pollmgr_tid) {
121	errx(EXIT_FAILURE, "failed to create poll manager thread");
122	/* NOTREACHED */
123	}
124	}
125
126
127	#if !defined(RT_OS_WINDOWS)
128	/**
129	* Formatter for %R[sockerr] - unix strerror_r() version.
130	*/
131	static DECLCALLBACK(size_t)
132	proxy_sockerr_rtstrfmt(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput,
133	const char pszType, const void pvValue,
134	int cchWidth, int cchPrecision, unsigned int fFlags,
135	void *pvUser)
136	{
137	const int error = (int)(intptr_t)pvValue;
138
139	const char *msg;
140	char buf[128];
141
142	NOREF(cchWidth);
143	NOREF(cchPrecision);
144	NOREF(fFlags);
145	NOREF(pvUser);
146
147	AssertReturn(strcmp(pszType, "sockerr") == 0, 0);
148
149	/* make sure return type mismatch is caught */
150	buf[0] = '\0';
151	#if defined(RT_OS_LINUX) && defined(_GNU_SOURCE)
152	msg = strerror_r(error, buf, sizeof(buf));
153	#else
154	strerror_r(error, buf, sizeof(buf));
155	msg = buf;
156	#endif
157	return RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL, "%s", msg);
158	}
159
160	#else /* RT_OS_WINDOWS */
161
162	/**
163	* Formatter for %R[sockerr] - windows FormatMessage() version.
164	*/
165	static DECLCALLBACK(size_t)
166	proxy_sockerr_rtstrfmt(PFNRTSTROUTPUT pfnOutput, void *pvArgOutput,
167	const char pszType, const void pvValue,
168	int cchWidth, int cchPrecision, unsigned int fFlags,
169	void *pvUser)
170	{
171	const int error = (int)(intptr_t)pvValue;
172	size_t cb = 0;
173
174	NOREF(cchWidth);
175	NOREF(cchPrecision);
176	NOREF(fFlags);
177	NOREF(pvUser);
178
179	AssertReturn(strcmp(pszType, "sockerr") == 0, 0);
180
181	/*
182	* XXX: Windows strerror() doesn't handle posix error codes, but
183	* since winsock uses its own, it shouldn't be much of a problem.
184	* If you see a strange error message, it's probably from
185	* FormatMessage() for an error from <WinError.h> that has the
186	* same numeric value.
187	*/
188	if (error < _sys_nerr) {
189	char buf[128] = "";
190	int status;
191
192	status = strerror_s(buf, sizeof(buf), error);
193	if (status == 0) {
194	if (strcmp(buf, "Unknown error") == 0) {
195	/* windows strerror() doesn't add the numeric value */
196	cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL,
197	"Unknown error: %d", error);
198	}
199	else {
200	cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL,
201	"%s", buf);
202	}
203	}
204	else {
205	cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL,
206	"Unknown error: %d", error);
207	}
208	}
209	else {
210	DWORD nchars;
211	char *msg = NULL;
212
213	nchars = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM
214	\| FORMAT_MESSAGE_ALLOCATE_BUFFER,
215	NULL, error, LANG_NEUTRAL,
216	(LPSTR)&msg, 0,
217	NULL);
218	if (nchars == 0 \|\| msg == NULL) {
219	cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL,
220	"Unknown error: %d", error);
221	}
222	else {
223	/* FormatMessage() "helpfully" adds newline; get rid of it */
224	char *crpos = strchr(msg, '\r');
225	if (crpos != NULL) {
226	*crpos = '\0';
227	}
228
229	cb += RTStrFormat(pfnOutput, pvArgOutput, NULL, NULL,
230	"%s", msg);
231	}
232
233	if (msg != NULL) {
234	LocalFree(msg);
235	}
236	}
237
238	return cb;
239	}
240	#endif /* RT_OS_WINDOWS */
241
242
243	/**
244	* Send static callback message from poll manager thread to lwip
245	* thread, scheduling a function call in lwip thread context.
246	*
247	* XXX: Existing lwip api only provides non-blocking version for this.
248	* It may fail when lwip thread is not running (mbox invalid) or if
249	* post failed (mbox full). How to handle these?
250	*/
251	void
252	proxy_lwip_post(struct tcpip_msg *msg)
253	{
254	struct tcpip_callback_msg *m;
255	err_t error;
256
257	LWIP_ASSERT1(msg != NULL);
258
259	/*
260	* lwip plays games with fake incomplete struct tag to enforce API
261	*/
262	m = (struct tcpip_callback_msg *)msg;
263	error = tcpip_callbackmsg(m);
264
265	if (error == ERR_VAL) {
266	/* XXX: lwip thread is not running (mbox invalid) */
267	LWIP_ASSERT1(error != ERR_VAL);
268	}
269
270	LWIP_ASSERT1(error == ERR_OK);
271	}
272
273
274	/**
275	* Create a non-blocking socket. Disable SIGPIPE for TCP sockets if
276	* possible. On Linux it's not possible and should be disabled for
277	* each send(2) individually.
278	*/
279	static SOCKET
280	proxy_create_socket(int sdom, int stype)
281	{
282	SOCKET s;
283	int stype_and_flags;
284	int status;
285
286	LWIP_UNUSED_ARG(status); /* depends on ifdefs */
287
288
289	stype_and_flags = stype;
290
291	#if defined(SOCK_NONBLOCK)
292	stype_and_flags \|= SOCK_NONBLOCK;
293	#endif
294
295	/*
296	* Disable SIGPIPE on disconnected socket. It might be easier to
297	* forgo it and just use MSG_NOSIGNAL on each send*(2), since we
298	* have to do it for Linux anyway, but Darwin does NOT have that
299	* flag (but has SO_NOSIGPIPE socket option).
300	*/
301	#if !defined(SOCK_NOSIGPIPE) && !defined(SO_NOSIGPIPE) && !defined(MSG_NOSIGNAL)
302	#if 0 /* XXX: Solaris has neither, the program should ignore SIGPIPE globally */
303	#error Need a way to disable SIGPIPE on connection oriented sockets!
304	#endif
305	#endif
306
307	#if defined(SOCK_NOSIGPIPE)
308	if (stype == SOCK_STREAM) {
309	stype_and_flags \|= SOCK_NOSIGPIPE;
310	}
311	#endif
312
313	s = socket(sdom, stype_and_flags, 0);
314	if (s == INVALID_SOCKET) {
315	DPRINTF(("socket: %R[sockerr]\n", SOCKERRNO()));
316	return INVALID_SOCKET;
317	}
318
319	#if defined(RT_OS_WINDOWS)
320	{
321	u_long mode = 1;
322	status = ioctlsocket(s, FIONBIO, &mode);
323	if (status == SOCKET_ERROR) {
324	DPRINTF(("FIONBIO: %R[sockerr]\n", SOCKERRNO()));
325	closesocket(s);
326	return INVALID_SOCKET;
327	}
328	}
329	#elif !defined(SOCK_NONBLOCK)
330	{
331	int sflags;
332
333	sflags = fcntl(s, F_GETFL, 0);
334	if (sflags < 0) {
335	DPRINTF(("F_GETFL: %R[sockerr]\n", SOCKERRNO()));
336	closesocket(s);
337	return INVALID_SOCKET;
338	}
339
340	status = fcntl(s, F_SETFL, sflags \| O_NONBLOCK);
341	if (status < 0) {
342	DPRINTF(("O_NONBLOCK: %R[sockerr]\n", SOCKERRNO()));
343	closesocket(s);
344	return INVALID_SOCKET;
345	}
346	}
347	#endif
348
349	#if !defined(SOCK_NOSIGPIPE) && defined(SO_NOSIGPIPE)
350	if (stype == SOCK_STREAM) {
351	int on = 1;
352	const socklen_t onlen = sizeof(on);
353
354	status = setsockopt(s, SOL_SOCKET, SO_NOSIGPIPE, &on, onlen);
355	if (status < 0) {
356	DPRINTF(("SO_NOSIGPIPE: %R[sockerr]\n", SOCKERRNO()));
357	closesocket(s);
358	return INVALID_SOCKET;
359	}
360	}
361	#endif
362
363	/*
364	* Disable the Nagle algorithm. Otherwise the host may hold back
365	* packets that the guest wants to go out, causing potentially
366	* horrible performance. The guest is already applying the Nagle
367	* algorithm (or not) the way it wants.
368	*/
369	if (stype == SOCK_STREAM) {
370	int on = 1;
371	const socklen_t onlen = sizeof(on);
372
373	status = setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *)&on, onlen);
374	if (status < 0) {
375	DPRINTF(("TCP_NODELAY: %R[sockerr]\n", SOCKERRNO()));
376	}
377	}
378
379	#if defined(RT_OS_WINDOWS)
380	/*
381	* lwIP only holds one packet of "refused data" for us. Proxy
382	* relies on OS socket send buffer and doesn't do its own
383	* buffering. Unfortunately on Windows send buffer is very small
384	* (8K by default) and is not dynamically adpated by the OS it
385	* seems. So a single large write will fill it up and that will
386	* make lwIP drop segments, causing guest TCP into pathologic
387	* resend patterns. As a quick and dirty fix just bump it up.
388	*/
389	if (stype == SOCK_STREAM) {
390	int sndbuf;
391	socklen_t optlen = sizeof(sndbuf);
392
393	status = getsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&sndbuf, &optlen);
394	if (status == 0) {
395	if (sndbuf < 64 * 1024) {
396	sndbuf = 64 * 1024;
397	status = setsockopt(s, SOL_SOCKET, SO_SNDBUF,
398	(char *)&sndbuf, optlen);
399	if (status != 0) {
400	DPRINTF(("SO_SNDBUF: setsockopt: %R[sockerr]\n", SOCKERRNO()));
401	}
402	}
403	}
404	else {
405	DPRINTF(("SO_SNDBUF: getsockopt: %R[sockerr]\n", SOCKERRNO()));
406	}
407	}
408	#endif
409
410	return s;
411	}
412
413
414	#ifdef RT_OS_LINUX
415	/**
416	* Fixup a socket returned by accept(2).
417	*
418	* On Linux a socket returned by accept(2) does NOT inherit the socket
419	* options from the listening socket! We need to repeat parts of the
420	* song and dance we did above to make it non-blocking.
421	*/
422	int
423	proxy_fixup_accepted_socket(SOCKET s)
424	{
425	int sflags;
426	int status;
427
428	sflags = fcntl(s, F_GETFL, 0);
429	if (sflags < 0) {
430	DPRINTF(("F_GETFL: %R[sockerr]\n", SOCKERRNO()));
431	return -1;
432	}
433
434	status = fcntl(s, F_SETFL, sflags \| O_NONBLOCK);
435	if (status < 0) {
436	DPRINTF(("O_NONBLOCK: %R[sockerr]\n", SOCKERRNO()));
437	return -1;
438	}
439
440	return 0;
441	}
442	#endif /* RT_OS_LINUX */
443
444
445	/**
446	* Create a socket for outbound connection to dst_addr:dst_port.
447	*
448	* The socket is non-blocking and TCP sockets has SIGPIPE disabled if
449	* possible. On Linux it's not possible and should be disabled for
450	* each send(2) individually.
451	*/
452	SOCKET
453	proxy_connected_socket(int sdom, int stype,
454	ipX_addr_t *dst_addr, u16_t dst_port)
455	{
456	struct sockaddr_in6 dst_sin6;
457	struct sockaddr_in dst_sin;
458	struct sockaddr *pdst_sa;
459	socklen_t dst_sa_len;
460	void *pdst_addr;
461	const struct sockaddr *psrc_sa;
462	socklen_t src_sa_len;
463	int status;
464	int sockerr;
465	SOCKET s;
466
467	LWIP_ASSERT1(sdom == PF_INET \|\| sdom == PF_INET6);
468	LWIP_ASSERT1(stype == SOCK_STREAM \|\| stype == SOCK_DGRAM);
469
470	DPRINTF(("---> %s ", stype == SOCK_STREAM ? "TCP" : "UDP"));
471	if (sdom == PF_INET6) {
472	pdst_sa = (struct sockaddr *)&dst_sin6;
473	pdst_addr = (void *)&dst_sin6.sin6_addr;
474
475	memset(&dst_sin6, 0, sizeof(dst_sin6));
476	#if HAVE_SA_LEN
477	dst_sin6.sin6_len =
478	#endif
479	dst_sa_len = sizeof(dst_sin6);
480	dst_sin6.sin6_family = AF_INET6;
481	memcpy(&dst_sin6.sin6_addr, &dst_addr->ip6, sizeof(ip6_addr_t));
482	dst_sin6.sin6_port = htons(dst_port);
483
484	DPRINTF(("[%RTnaipv6]:%d ", &dst_sin6.sin6_addr, dst_port));
485	}
486	else { /* sdom = PF_INET */
487	pdst_sa = (struct sockaddr *)&dst_sin;
488	pdst_addr = (void *)&dst_sin.sin_addr;
489
490	memset(&dst_sin, 0, sizeof(dst_sin));
491	#if HAVE_SA_LEN
492	dst_sin.sin_len =
493	#endif
494	dst_sa_len = sizeof(dst_sin);
495	dst_sin.sin_family = AF_INET;
496	dst_sin.sin_addr.s_addr = dst_addr->ip4.addr; /* byte-order? */
497	dst_sin.sin_port = htons(dst_port);
498
499	DPRINTF(("%RTnaipv4:%d ", dst_sin.sin_addr.s_addr, dst_port));
500	}
501
502	s = proxy_create_socket(sdom, stype);
503	if (s == INVALID_SOCKET) {
504	return INVALID_SOCKET;
505	}
506	DPRINTF(("socket %d\n", s));
507
508	/** @todo needs locking if dynamic modifyvm is allowed */
509	if (sdom == PF_INET6) {
510	psrc_sa = (const struct sockaddr *)g_proxy_options->src6;
511	src_sa_len = sizeof(struct sockaddr_in6);
512	}
513	else {
514	psrc_sa = (const struct sockaddr *)g_proxy_options->src4;
515	src_sa_len = sizeof(struct sockaddr_in);
516	}
517	if (psrc_sa != NULL) {
518	status = bind(s, psrc_sa, src_sa_len);
519	if (status == SOCKET_ERROR) {
520	sockerr = SOCKERRNO();
521	DPRINTF(("socket %d: bind: %R[sockerr]\n", s, sockerr));
522	closesocket(s);
523	SET_SOCKERRNO(sockerr);
524	return INVALID_SOCKET;
525	}
526	}
527
528	status = connect(s, pdst_sa, dst_sa_len);
529	if (status == SOCKET_ERROR
530	#if !defined(RT_OS_WINDOWS)
531	&& SOCKERRNO() != EINPROGRESS
532	#else
533	&& SOCKERRNO() != EWOULDBLOCK
534	#endif
535	)
536	{
537	sockerr = SOCKERRNO();
538	DPRINTF(("socket %d: connect: %R[sockerr]\n", s, sockerr));
539	closesocket(s);
540	SET_SOCKERRNO(sockerr);
541	return INVALID_SOCKET;
542	}
543
544	return s;
545	}
546
547
548	/**
549	* Create a socket for inbound (port-forwarded) connections to
550	* src_addr (port is part of sockaddr, so not a separate argument).
551	*
552	* The socket is non-blocking and TCP sockets has SIGPIPE disabled if
553	* possible. On Linux it's not possible and should be disabled for
554	* each send(2) individually.
555	*
556	* TODO?: Support v6-mapped v4 so that user can specify she wants
557	* "udp" and get both versions?
558	*/
559	SOCKET
560	proxy_bound_socket(int sdom, int stype, struct sockaddr *src_addr)
561	{
562	SOCKET s;
563	int on;
564	const socklen_t onlen = sizeof(on);
565	int status;
566	int sockerr;
567
568	s = proxy_create_socket(sdom, stype);
569	if (s == INVALID_SOCKET) {
570	return INVALID_SOCKET;
571	}
572	DPRINTF(("socket %d\n", s));
573
574	on = 1;
575	status = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&on, onlen);
576	if (status < 0) { /* not good, but not fatal */
577	DPRINTF(("SO_REUSEADDR: %R[sockerr]\n", SOCKERRNO()));
578	}
579
580	status = bind(s, src_addr,
581	sdom == PF_INET ?
582	sizeof(struct sockaddr_in)
583	: sizeof(struct sockaddr_in6));
584	if (status == SOCKET_ERROR) {
585	sockerr = SOCKERRNO();
586	DPRINTF(("bind: %R[sockerr]\n", sockerr));
587	closesocket(s);
588	SET_SOCKERRNO(sockerr);
589	return INVALID_SOCKET;
590	}
591
592	if (stype == SOCK_STREAM) {
593	status = listen(s, 5);
594	if (status == SOCKET_ERROR) {
595	sockerr = SOCKERRNO();
596	DPRINTF(("listen: %R[sockerr]\n", sockerr));
597	closesocket(s);
598	SET_SOCKERRNO(sockerr);
599	return INVALID_SOCKET;
600	}
601	}
602
603	return s;
604	}
605
606
607	void
608	proxy_reset_socket(SOCKET s)
609	{
610	struct linger linger;
611
612	linger.l_onoff = 1;
613	linger.l_linger = 0;
614
615	/* On Windows we can run into issue here, perhaps SO_LINGER isn't enough, and
616	* we should use WSA{Send,Recv}Disconnect instead.
617	*
618	* Links for the reference:
619	* http://msdn.microsoft.com/en-us/library/windows/desktop/ms738547%28v=vs.85%29.aspx
620	* http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4468997
621	*/
622	setsockopt(s, SOL_SOCKET, SO_LINGER, (char *)&linger, sizeof(linger));
623
624	closesocket(s);
625	}
626
627
628	int
629	proxy_sendto(SOCKET sock, struct pbuf p, void name, size_t namelen)
630	{
631	struct pbuf *q;
632	size_t i, clen;
633	#ifndef RT_OS_WINDOWS
634	struct msghdr mh;
635	ssize_t nsent;
636	#else
637	DWORD nsent;
638	#endif
639	int rc;
640	IOVEC fixiov[8]; /* fixed size (typical case) */
641	const size_t fixiovsize = sizeof(fixiov)/sizeof(fixiov[0]);
642	IOVEC dyniov; / dynamically sized */
643	IOVEC *iov;
644	int error = 0;
645
646	/*
647	* Static iov[] is usually enough since UDP protocols use small
648	* datagrams to avoid fragmentation, but be prepared.
649	*/
650	clen = pbuf_clen(p);
651	if (clen > fixiovsize) {
652	/*
653	* XXX: TODO: check that clen is shorter than IOV_MAX
654	*/
655	dyniov = (IOVEC )malloc(clen sizeof(*dyniov));
656	if (dyniov == NULL) {
657	error = -errno; /* sic: not a socket error */
658	goto out;
659	}
660	iov = dyniov;
661	}
662	else {
663	dyniov = NULL;
664	iov = fixiov;
665	}
666
667
668	for (q = p, i = 0; i < clen; q = q->next, ++i) {
669	LWIP_ASSERT1(q != NULL);
670
671	IOVEC_SET_BASE(iov[i], q->payload);
672	IOVEC_SET_LEN(iov[i], q->len);
673	}
674
675	#ifndef RT_OS_WINDOWS
676	memset(&mh, 0, sizeof(mh));
677	mh.msg_name = name;
678	mh.msg_namelen = namelen;
679	mh.msg_iov = iov;
680	mh.msg_iovlen = clen;
681
682	nsent = sendmsg(sock, &mh, 0);
683	rc = (nsent >= 0) ? 0 : SOCKET_ERROR;
684	#else
685	rc = WSASendTo(sock, iov, (DWORD)clen, &nsent, 0,
686	name, (int)namelen, NULL, NULL);
687	#endif
688	if (rc == SOCKET_ERROR) {
689	error = SOCKERRNO();
690	DPRINTF(("%s: socket %d: sendmsg: %R[sockerr]\n",
691	__func__, sock, error));
692	error = -error;
693	}
694
695	out:
696	if (dyniov != NULL) {
697	free(dyniov);
698	}
699	return error;
700	}
701
702
703	static const char *lwiperr[] = {
704	"ERR_OK",
705	"ERR_MEM",
706	"ERR_BUF",
707	"ERR_TIMEOUT",
708	"ERR_RTE",
709	"ERR_INPROGRESS",
710	"ERR_VAL",
711	"ERR_WOULDBLOCK",
712	"ERR_USE",
713	"ERR_ISCONN",
714	"ERR_ABRT",
715	"ERR_RST",
716	"ERR_CLSD",
717	"ERR_CONN",
718	"ERR_ARG",
719	"ERR_IF"
720	};
721
722
723	const char *
724	proxy_lwip_strerr(err_t error)
725	{
726	static char buf[32];
727	int e = -error;
728
729	if (0 <= e && e < (int)__arraycount(lwiperr)) {
730	return lwiperr[e];
731	}
732	else {
733	RTStrPrintf(buf, sizeof(buf), "unknown error %d", error);
734	return buf;
735	}
736	}

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source: vbox/trunk/src/VBox/NetworkServices/NAT/proxy.c@ 94068

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