tcp_subr.c@ 14275

Last change on this file since 14275 was 14275, checked in by vboxsync, 16 years ago
TCP reassembling (compilable, but not working version)
Property svn:eol-style set to `native`
File size: 38.1 KB

Line
1	/*
2	* Copyright (c) 1982, 1986, 1988, 1990, 1993
3	* The Regents of the University of California. All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions
7	* are met:
8	* 1. Redistributions of source code must retain the above copyright
9	* notice, this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	* 3. All advertising materials mentioning features or use of this software
14	* must display the following acknowledgement:
15	* This product includes software developed by the University of
16	* California, Berkeley and its contributors.
17	* 4. Neither the name of the University nor the names of its contributors
18	* may be used to endorse or promote products derived from this software
19	* without specific prior written permission.
20	*
21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31	* SUCH DAMAGE.
32	*
33	* @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93
34	* tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
35	*/
36
37	/*
38	* Changes and additions relating to SLiRP
39	* Copyright (c) 1995 Danny Gasparovski.
40	*
41	* Please read the file COPYRIGHT for the
42	* terms and conditions of the copyright.
43	*/
44
45	#define WANT_SYS_IOCTL_H
46	#include <slirp.h>
47
48
49	/*
50	* Tcp initialization
51	*/
52	void
53	tcp_init(PNATState pData)
54	{
55	tcp_iss = 1; /* wrong */
56	tcb.so_next = tcb.so_prev = &tcb;
57	tcp_last_so = &tcb;
58	}
59
60	/*
61	* Create template to be used to send tcp packets on a connection.
62	* Call after host entry created, fills
63	* in a skeletal tcp/ip header, minimizing the amount of work
64	* necessary when the connection is used.
65	*/
66	/* struct tcpiphdr * */
67	void
68	tcp_template(tp)
69	struct tcpcb *tp;
70	{
71	struct socket *so = tp->t_socket;
72	register struct tcpiphdr *n = &tp->t_template;
73
74	n->ti_next = n->ti_prev = 0;
75	n->ti_x1 = 0;
76	n->ti_pr = IPPROTO_TCP;
77	n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
78	n->ti_src = so->so_faddr;
79	n->ti_dst = so->so_laddr;
80	n->ti_sport = so->so_fport;
81	n->ti_dport = so->so_lport;
82
83	n->ti_seq = 0;
84	n->ti_ack = 0;
85	n->ti_x2 = 0;
86	n->ti_off = 5;
87	n->ti_flags = 0;
88	n->ti_win = 0;
89	n->ti_sum = 0;
90	n->ti_urp = 0;
91	}
92
93	/*
94	* Send a single message to the TCP at address specified by
95	* the given TCP/IP header. If m == 0, then we make a copy
96	* of the tcpiphdr at ti and send directly to the addressed host.
97	* This is used to force keep alive messages out using the TCP
98	* template for a connection tp->t_template. If flags are given
99	* then we send a message back to the TCP which originated the
100	* segment ti, and discard the mbuf containing it and any other
101	* attached mbufs.
102	*
103	* In any case the ack and sequence number of the transmitted
104	* segment are as specified by the parameters.
105	*/
106	void
107	tcp_respond(PNATState pData, struct tcpcb tp, struct tcpiphdr ti, struct mbuf *m, tcp_seq ack, tcp_seq seq, int flags)
108	{
109	register int tlen;
110	int win = 0;
111
112	DEBUG_CALL("tcp_respond");
113	DEBUG_ARG("tp = %lx", (long)tp);
114	DEBUG_ARG("ti = %lx", (long)ti);
115	DEBUG_ARG("m = %lx", (long)m);
116	DEBUG_ARG("ack = %u", ack);
117	DEBUG_ARG("seq = %u", seq);
118	DEBUG_ARG("flags = %x", flags);
119
120	if (tp)
121	win = sbspace(&tp->t_socket->so_rcv);
122	if (m == 0) {
123	if ((m = m_get(pData)) == NULL)
124	return;
125	#ifdef TCP_COMPAT_42
126	tlen = 1;
127	#else
128	tlen = 0;
129	#endif
130	m->m_data += if_maxlinkhdr;
131	mtod(m, struct tcpiphdr ) = *ti;
132	ti = mtod(m, struct tcpiphdr *);
133	flags = TH_ACK;
134	} else {
135	/*
136	* ti points into m so the next line is just making
137	* the mbuf point to ti
138	*/
139	m->m_data = (caddr_t)ti;
140
141	m->m_len = sizeof (struct tcpiphdr);
142	tlen = 0;
143	#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
144	xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
145	xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
146	#undef xchg
147	}
148	ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
149	tlen += sizeof (struct tcpiphdr);
150	m->m_len = tlen;
151
152	ti->ti_next = ti->ti_prev = 0;
153	ti->ti_x1 = 0;
154	ti->ti_seq = htonl(seq);
155	ti->ti_ack = htonl(ack);
156	ti->ti_x2 = 0;
157	ti->ti_off = sizeof (struct tcphdr) >> 2;
158	ti->ti_flags = flags;
159	if (tp)
160	ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
161	else
162	ti->ti_win = htons((u_int16_t)win);
163	ti->ti_urp = 0;
164	ti->ti_sum = 0;
165	ti->ti_sum = cksum(m, tlen);
166	((struct ip *)ti)->ip_len = tlen;
167
168	if(flags & TH_RST)
169	((struct ip *)ti)->ip_ttl = MAXTTL;
170	else
171	((struct ip *)ti)->ip_ttl = ip_defttl;
172
173	(void) ip_output(pData, (struct socket *)0, m);
174	}
175
176	/*
177	* Create a new TCP control block, making an
178	* empty reassembly queue and hooking it to the argument
179	* protocol control block.
180	*/
181	struct tcpcb *
182	tcp_newtcpcb(PNATState pData, struct socket *so)
183	{
184	register struct tcpcb *tp;
185
186	tp = (struct tcpcb )malloc(sizeof(tp));
187	if (tp == NULL)
188	return ((struct tcpcb *)0);
189
190	memset((char *) tp, 0, sizeof(struct tcpcb));
191	#ifndef VBOX_WITH_BSD_TCP_REASS
192	tp->seg_next = tp->seg_prev = ptr_to_u32(pData, (struct tcpiphdr *)tp);
193	#else /* !VBOX_WITH_BSD_TCP_REASS */
194	/XXX: inject initialization here/
195	#endif /* VBOX_WITH_BSD_TCP_REASS */
196	tp->t_maxseg = tcp_mssdflt;
197
198	tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE\|TF_REQ_TSTMP) : 0;
199	tp->t_socket = so;
200
201	/*
202	* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
203	* rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
204	* reasonable initial retransmit time.
205	*/
206	tp->t_srtt = TCPTV_SRTTBASE;
207	tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
208	tp->t_rttmin = TCPTV_MIN;
209
210	TCPT_RANGESET(tp->t_rxtcur,
211	((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
212	TCPTV_MIN, TCPTV_REXMTMAX);
213
214	tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
215	tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
216	tp->t_state = TCPS_CLOSED;
217
218	so->so_tcpcb = tp;
219
220	return (tp);
221	}
222
223	/*
224	* Drop a TCP connection, reporting
225	* the specified error. If connection is synchronized,
226	* then send a RST to peer.
227	*/
228	struct tcpcb tcp_drop(PNATState pData, struct tcpcb tp, int err)
229	{
230	/* tcp_drop(tp, errno)
231	register struct tcpcb *tp;
232	int errno;
233	{
234	*/
235
236	DEBUG_CALL("tcp_drop");
237	DEBUG_ARG("tp = %lx", (long)tp);
238	DEBUG_ARG("errno = %d", errno);
239
240	if (TCPS_HAVERCVDSYN(tp->t_state)) {
241	tp->t_state = TCPS_CLOSED;
242	(void) tcp_output(pData, tp);
243	tcpstat.tcps_drops++;
244	} else
245	tcpstat.tcps_conndrops++;
246	/* if (errno == ETIMEDOUT && tp->t_softerror)
247	* errno = tp->t_softerror;
248	*/
249	/* so->so_error = errno; */
250	return (tcp_close(pData, tp));
251	}
252
253	/*
254	* Close a TCP control block:
255	* discard all space held by the tcp
256	* discard internet protocol block
257	* wake up any sleepers
258	*/
259	struct tcpcb *
260	tcp_close(PNATState pData, register struct tcpcb *tp)
261	{
262	register struct tcpiphdr *t;
263	struct socket *so = tp->t_socket;
264	register struct mbuf *m;
265
266	DEBUG_CALL("tcp_close");
267	DEBUG_ARG("tp = %lx", (long )tp);
268
269	#ifndef VBOX_WITH_BSD_TCP_REASS
270	/* free the reassembly queue, if any */
271	t = u32_to_ptr(pData, tp->seg_next, struct tcpiphdr *);
272	while (t != (struct tcpiphdr *)tp) {
273	t = u32_to_ptr(pData, t->ti_next, struct tcpiphdr *);
274	m = REASS_MBUF_GET(u32_to_ptr(pData, t->ti_prev, struct tcpiphdr *));
275	remque_32(pData, u32_to_ptr(pData, t->ti_prev, struct tcpiphdr *));
276	m_freem(pData, m);
277	}
278	#else /* !VBOX_WITH_BSD_TCP_REASS */
279	/XXX: freeing the reassembly queue /
280	#endif /* VBOX_WITH_BSD_TCP_REASS */
281	/* It's static */
282	/* if (tp->t_template)
283	* (void) m_free(dtom(tp->t_template));
284	*/
285	/* free(tp, M_PCB); */
286	u32ptr_done(pData, ptr_to_u32(pData, tp), tp);
287	free(tp);
288	so->so_tcpcb = 0;
289	soisfdisconnected(so);
290	/* clobber input socket cache if we're closing the cached connection */
291	if (so == tcp_last_so)
292	tcp_last_so = &tcb;
293	closesocket(so->s);
294	sbfree(&so->so_rcv);
295	sbfree(&so->so_snd);
296	sofree(pData, so);
297	tcpstat.tcps_closed++;
298	return ((struct tcpcb *)0);
299	}
300
301	void
302	tcp_drain()
303	{
304	/* XXX */
305	}
306
307	/*
308	* When a source quench is received, close congestion window
309	* to one segment. We will gradually open it again as we proceed.
310	*/
311
312	#ifdef notdef
313
314	void
315	tcp_quench(i, errno)
316
317	int errno;
318	{
319	struct tcpcb *tp = intotcpcb(inp);
320
321	if (tp)
322	tp->snd_cwnd = tp->t_maxseg;
323	}
324
325	#endif /* notdef */
326
327	/*
328	* TCP protocol interface to socket abstraction.
329	*/
330
331	/*
332	* User issued close, and wish to trail through shutdown states:
333	* if never received SYN, just forget it. If got a SYN from peer,
334	* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
335	* If already got a FIN from peer, then almost done; go to LAST_ACK
336	* state. In all other cases, have already sent FIN to peer (e.g.
337	* after PRU_SHUTDOWN), and just have to play tedious game waiting
338	* for peer to send FIN or not respond to keep-alives, etc.
339	* We can let the user exit from the close as soon as the FIN is acked.
340	*/
341	void
342	tcp_sockclosed(PNATState pData, struct tcpcb *tp)
343	{
344
345	DEBUG_CALL("tcp_sockclosed");
346	DEBUG_ARG("tp = %lx", (long)tp);
347
348	switch (tp->t_state) {
349
350	case TCPS_CLOSED:
351	case TCPS_LISTEN:
352	case TCPS_SYN_SENT:
353	tp->t_state = TCPS_CLOSED;
354	tp = tcp_close(pData, tp);
355	break;
356
357	case TCPS_SYN_RECEIVED:
358	case TCPS_ESTABLISHED:
359	tp->t_state = TCPS_FIN_WAIT_1;
360	break;
361
362	case TCPS_CLOSE_WAIT:
363	tp->t_state = TCPS_LAST_ACK;
364	break;
365	}
366	/* soisfdisconnecting(tp->t_socket); */
367	if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
368	soisfdisconnected(tp->t_socket);
369	if (tp)
370	tcp_output(pData, tp);
371	}
372
373	/*
374	* Connect to a host on the Internet
375	* Called by tcp_input
376	* Only do a connect, the tcp fields will be set in tcp_input
377	* return 0 if there's a result of the connect,
378	* else return -1 means we're still connecting
379	* The return value is almost always -1 since the socket is
380	* nonblocking. Connect returns after the SYN is sent, and does
381	* not wait for ACK+SYN.
382	*/
383	int tcp_fconnect(PNATState pData, struct socket *so)
384	{
385	int ret=0;
386
387	DEBUG_CALL("tcp_fconnect");
388	DEBUG_ARG("so = %lx", (long )so);
389
390	if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
391	int opt, s=so->s;
392	struct sockaddr_in addr;
393
394	fd_nonblock(s);
395	opt = 1;
396	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
397	opt = 1;
398	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
399
400	addr.sin_family = AF_INET;
401	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr) {
402	/* It's an alias */
403	switch(ntohl(so->so_faddr.s_addr) & ~pData->netmask) {
404	case CTL_DNS:
405	if (!get_dns_addr(pData, &dns_addr))
406	addr.sin_addr = dns_addr;
407	else
408	addr.sin_addr = loopback_addr;
409	break;
410	case CTL_ALIAS:
411	default:
412	addr.sin_addr = loopback_addr;
413	break;
414	}
415	} else
416	addr.sin_addr = so->so_faddr;
417	addr.sin_port = so->so_fport;
418
419	DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
420	"addr.sin_addr.s_addr=%.16s\n",
421	ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
422	/* We don't care what port we get */
423	ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
424
425	/*
426	* If it's not in progress, it failed, so we just return 0,
427	* without clearing SS_NOFDREF
428	*/
429	soisfconnecting(so);
430	}
431
432	return(ret);
433	}
434
435	/*
436	* Accept the socket and connect to the local-host
437	*
438	* We have a problem. The correct thing to do would be
439	* to first connect to the local-host, and only if the
440	* connection is accepted, then do an accept() here.
441	* But, a) we need to know who's trying to connect
442	* to the socket to be able to SYN the local-host, and
443	* b) we are already connected to the foreign host by
444	* the time it gets to accept(), so... We simply accept
445	* here and SYN the local-host.
446	*/
447	void
448	tcp_connect(PNATState pData, struct socket *inso)
449	{
450	struct socket *so;
451	struct sockaddr_in addr;
452	socklen_t addrlen = sizeof(struct sockaddr_in);
453	struct tcpcb *tp;
454	int s, opt;
455
456	DEBUG_CALL("tcp_connect");
457	DEBUG_ARG("inso = %lx", (long)inso);
458
459	/*
460	* If it's an SS_ACCEPTONCE socket, no need to socreate()
461	* another socket, just use the accept() socket.
462	*/
463	if (inso->so_state & SS_FACCEPTONCE) {
464	/* FACCEPTONCE already have a tcpcb */
465	so = inso;
466	} else {
467	if ((so = socreate()) == NULL) {
468	/* If it failed, get rid of the pending connection */
469	closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
470	return;
471	}
472	if (tcp_attach(pData, so) < 0) {
473	free(so); /* NOT sofree */
474	return;
475	}
476	so->so_laddr = inso->so_laddr;
477	so->so_lport = inso->so_lport;
478	}
479
480	(void) tcp_mss(pData, sototcpcb(so), 0);
481
482	if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
483	tcp_close(pData, sototcpcb(so)); /* This will sofree() as well */
484	return;
485	}
486	fd_nonblock(s);
487	opt = 1;
488	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
489	opt = 1;
490	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
491	opt = 1;
492	setsockopt(s,IPPROTO_TCP,TCP_NODELAY,(char *)&opt,sizeof(int));
493
494	so->so_fport = addr.sin_port;
495	so->so_faddr = addr.sin_addr;
496	/* Translate connections from localhost to the real hostname */
497	if (so->so_faddr.s_addr == 0 \|\| so->so_faddr.s_addr == loopback_addr.s_addr)
498	so->so_faddr = alias_addr;
499
500	/* Close the accept() socket, set right state */
501	if (inso->so_state & SS_FACCEPTONCE) {
502	closesocket(so->s); /* If we only accept once, close the accept() socket */
503	so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
504	/* if it's not FACCEPTONCE, it's already NOFDREF */
505	}
506	so->s = s;
507
508	so->so_iptos = tcp_tos(so);
509	tp = sototcpcb(so);
510
511	tcp_template(tp);
512
513	/* Compute window scaling to request. */
514	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
515	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
516	* tp->request_r_scale++;
517	*/
518
519	/* soisconnecting(so); / / NOFDREF used instead */
520	tcpstat.tcps_connattempt++;
521
522	tp->t_state = TCPS_SYN_SENT;
523	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
524	tp->iss = tcp_iss;
525	tcp_iss += TCP_ISSINCR/2;
526	tcp_sendseqinit(tp);
527	tcp_output(pData, tp);
528	}
529
530	/*
531	* Attach a TCPCB to a socket.
532	*/
533	int
534	tcp_attach(PNATState pData, struct socket *so)
535	{
536	if ((so->so_tcpcb = tcp_newtcpcb(pData, so)) == NULL)
537	return -1;
538
539	insque(pData, so, &tcb);
540
541	return 0;
542	}
543
544	/*
545	* Set the socket's type of service field
546	*/
547	static const struct tos_t tcptos[] = {
548	{0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
549	{21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
550	{0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
551	{0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
552	{0, 513, IPTOS_LOWDELAY, EMU_RLOGIN\|EMU_NOCONNECT}, /* rlogin */
553	{0, 514, IPTOS_LOWDELAY, EMU_RSH\|EMU_NOCONNECT}, /* shell */
554	{0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
555	{0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
556	{0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
557	{0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
558	{0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
559	{0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
560	{0, 0, 0, 0}
561	};
562
563	/*
564	* Return TOS according to the above table
565	*/
566	u_int8_t
567	tcp_tos(so)
568	struct socket *so;
569	{
570	int i = 0;
571
572	while(tcptos[i].tos) {
573	if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) \|\|
574	(tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
575	so->so_emu = tcptos[i].emu;
576	return tcptos[i].tos;
577	}
578	i++;
579	}
580
581	return 0;
582	}
583
584	/*
585	* Emulate programs that try and connect to us
586	* This includes ftp (the data connection is
587	* initiated by the server) and IRC (DCC CHAT and
588	* DCC SEND) for now
589	*
590	* NOTE: It's possible to crash SLiRP by sending it
591	* unstandard strings to emulate... if this is a problem,
592	* more checks are needed here
593	*
594	* XXX Assumes the whole command came in one packet
595	*
596	* XXX Some ftp clients will have their TOS set to
597	* LOWDELAY and so Nagel will kick in. Because of this,
598	* we'll get the first letter, followed by the rest, so
599	* we simply scan for ORT instead of PORT...
600	* DCC doesn't have this problem because there's other stuff
601	* in the packet before the DCC command.
602	*
603	* Return 1 if the mbuf m is still valid and should be
604	* sbappend()ed
605	*
606	* NOTE: if you return 0 you MUST m_free() the mbuf!
607	*/
608	int
609	tcp_emu(PNATState pData, struct socket so, struct mbuf m)
610	{
611	u_int n1, n2, n3, n4, n5, n6;
612	char buff[256];
613	u_int32_t laddr;
614	u_int lport;
615	char *bptr;
616
617	DEBUG_CALL("tcp_emu");
618	DEBUG_ARG("so = %lx", (long)so);
619	DEBUG_ARG("m = %lx", (long)m);
620
621	switch(so->so_emu) {
622	int x, i;
623
624	case EMU_IDENT:
625	/*
626	* Identification protocol as per rfc-1413
627	*/
628
629	{
630	struct socket *tmpso;
631	struct sockaddr_in addr;
632	socklen_t addrlen = sizeof(struct sockaddr_in);
633	struct sbuf *so_rcv = &so->so_rcv;
634
635	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
636	so_rcv->sb_wptr += m->m_len;
637	so_rcv->sb_rptr += m->m_len;
638	m->m_data[m->m_len] = 0; /* NULL terminate */
639	if (strchr(m->m_data, '\r') \|\| strchr(m->m_data, '\n')) {
640	if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
641	HTONS(n1);
642	HTONS(n2);
643	/* n2 is the one on our host */
644	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
645	if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
646	tmpso->so_lport == n2 &&
647	tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
648	tmpso->so_fport == n1) {
649	if (getsockname(tmpso->s,
650	(struct sockaddr *)&addr, &addrlen) == 0)
651	n2 = ntohs(addr.sin_port);
652	break;
653	}
654	}
655	}
656	so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
657	so_rcv->sb_rptr = so_rcv->sb_data;
658	so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
659	}
660	m_free(pData, m);
661	return 0;
662	}
663
664	#if 0
665	case EMU_RLOGIN:
666	/*
667	* Rlogin emulation
668	* First we accumulate all the initial option negotiation,
669	* then fork_exec() rlogin according to the options
670	*/
671	{
672	int i, i2, n;
673	char *ptr;
674	char args[100];
675	char term[100];
676	struct sbuf *so_snd = &so->so_snd;
677	struct sbuf *so_rcv = &so->so_rcv;
678
679	/* First check if they have a priveladged port, or too much data has arrived */
680	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
681	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
682	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
683	so_snd->sb_wptr += 18;
684	so_snd->sb_cc += 18;
685	tcp_sockclosed(sototcpcb(so));
686	m_free(m);
687	return 0;
688	}
689
690	/* Append the current data */
691	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
692	so_rcv->sb_wptr += m->m_len;
693	so_rcv->sb_rptr += m->m_len;
694	m_free(m);
695
696	/*
697	* Check if we have all the initial options,
698	* and build argument list to rlogin while we're here
699	*/
700	n = 0;
701	ptr = so_rcv->sb_data;
702	args[0] = 0;
703	term[0] = 0;
704	while (ptr < so_rcv->sb_wptr) {
705	if (*ptr++ == 0) {
706	n++;
707	if (n == 2) {
708	sprintf(args, "rlogin -l %s %s",
709	ptr, inet_ntoa(so->so_faddr));
710	} else if (n == 3) {
711	i2 = so_rcv->sb_wptr - ptr;
712	for (i = 0; i < i2; i++) {
713	if (ptr[i] == '/') {
714	ptr[i] = 0;
715	#ifdef HAVE_SETENV
716	sprintf(term, "%s", ptr);
717	#else
718	sprintf(term, "TERM=%s", ptr);
719	#endif
720	ptr[i] = '/';
721	break;
722	}
723	}
724	}
725	}
726	}
727
728	if (n != 4)
729	return 0;
730
731	/* We have it, set our term variable and fork_exec() */
732	#ifdef HAVE_SETENV
733	setenv("TERM", term, 1);
734	#else
735	putenv(term);
736	#endif
737	fork_exec(so, args, 2);
738	term[0] = 0;
739	so->so_emu = 0;
740
741	/* And finally, send the client a 0 character */
742	so_snd->sb_wptr[0] = 0;
743	so_snd->sb_wptr++;
744	so_snd->sb_cc++;
745
746	return 0;
747	}
748
749	case EMU_RSH:
750	/*
751	* rsh emulation
752	* First we accumulate all the initial option negotiation,
753	* then rsh_exec() rsh according to the options
754	*/
755	{
756	int n;
757	char *ptr;
758	char *user;
759	char *args;
760	struct sbuf *so_snd = &so->so_snd;
761	struct sbuf *so_rcv = &so->so_rcv;
762
763	/* First check if they have a priveladged port, or too much data has arrived */
764	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
765	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
766	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
767	so_snd->sb_wptr += 18;
768	so_snd->sb_cc += 18;
769	tcp_sockclosed(sototcpcb(so));
770	m_free(m);
771	return 0;
772	}
773
774	/* Append the current data */
775	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
776	so_rcv->sb_wptr += m->m_len;
777	so_rcv->sb_rptr += m->m_len;
778	m_free(m);
779
780	/*
781	* Check if we have all the initial options,
782	* and build argument list to rlogin while we're here
783	*/
784	n = 0;
785	ptr = so_rcv->sb_data;
786	user="";
787	args="";
788	if (so->extra==NULL) {
789	struct socket *ns;
790	struct tcpcb* tp;
791	int port=atoi(ptr);
792	if (port <= 0) return 0;
793	if (port > 1023 \|\| port < 512) {
794	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
795	so_snd->sb_wptr += 18;
796	so_snd->sb_cc += 18;
797	tcp_sockclosed(sototcpcb(so));
798	return 0;
799	}
800	if ((ns=socreate()) == NULL)
801	return 0;
802	if (tcp_attach(ns)<0) {
803	free(ns);
804	return 0;
805	}
806
807	ns->so_laddr=so->so_laddr;
808	ns->so_lport=htons(port);
809
810	(void) tcp_mss(sototcpcb(ns), 0);
811
812	ns->so_faddr=so->so_faddr;
813	ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
814
815	if (ns->so_faddr.s_addr == 0 \|\|
816	ns->so_faddr.s_addr == loopback_addr.s_addr)
817	ns->so_faddr = alias_addr;
818
819	ns->so_iptos = tcp_tos(ns);
820	tp = sototcpcb(ns);
821
822	tcp_template(tp);
823
824	/* Compute window scaling to request. */
825	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
826	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
827	* tp->request_r_scale++;
828	*/
829
830	/soisfconnecting(ns);/
831
832	tcpstat.tcps_connattempt++;
833
834	tp->t_state = TCPS_SYN_SENT;
835	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
836	tp->iss = tcp_iss;
837	tcp_iss += TCP_ISSINCR/2;
838	tcp_sendseqinit(tp);
839	tcp_output(tp);
840	so->extra=ns;
841	}
842	while (ptr < so_rcv->sb_wptr) {
843	if (*ptr++ == 0) {
844	n++;
845	if (n == 2) {
846	user=ptr;
847	} else if (n == 3) {
848	args=ptr;
849	}
850	}
851	}
852
853	if (n != 4)
854	return 0;
855
856	rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
857	so->so_emu = 0;
858	so->extra=NULL;
859
860	/* And finally, send the client a 0 character */
861	so_snd->sb_wptr[0] = 0;
862	so_snd->sb_wptr++;
863	so_snd->sb_cc++;
864
865	return 0;
866	}
867
868	case EMU_CTL:
869	{
870	int num;
871	struct sbuf *so_snd = &so->so_snd;
872	struct sbuf *so_rcv = &so->so_rcv;
873
874	/*
875	* If there is binary data here, we save it in so->so_m
876	*/
877	if (!so->so_m) {
878	int rxlen;
879	char *rxdata;
880	rxdata=mtod(m, char *);
881	for (rxlen=m->m_len; rxlen; rxlen--) {
882	if (*rxdata++ & 0x80) {
883	so->so_m = m;
884	return 0;
885	}
886	}
887	} /* if(so->so_m==NULL) */
888
889	/*
890	* Append the line
891	*/
892	sbappendsb(so_rcv, m);
893
894	/* To avoid going over the edge of the buffer, we reset it */
895	if (so_snd->sb_cc == 0)
896	so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
897
898	/*
899	* A bit of a hack:
900	* If the first packet we get here is 1 byte long, then it
901	* was done in telnet character mode, therefore we must echo
902	* the characters as they come. Otherwise, we echo nothing,
903	* because in linemode, the line is already echoed
904	* XXX two or more control connections won't work
905	*/
906	if (do_echo == -1) {
907	if (m->m_len == 1) do_echo = 1;
908	else do_echo = 0;
909	}
910	if (do_echo) {
911	sbappendsb(so_snd, m);
912	m_free(m);
913	tcp_output(sototcpcb(so)); /* XXX */
914	} else
915	m_free(m);
916
917	num = 0;
918	while (num < so->so_rcv.sb_cc) {
919	if (*(so->so_rcv.sb_rptr + num) == '\n' \|\|
920	*(so->so_rcv.sb_rptr + num) == '\r') {
921	int n;
922
923	*(so_rcv->sb_rptr + num) = 0;
924	if (ctl_password && !ctl_password_ok) {
925	/* Need a password */
926	if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
927	if (strcmp(buff, ctl_password) == 0) {
928	ctl_password_ok = 1;
929	n = sprintf(so_snd->sb_wptr,
930	"Password OK.\r\n");
931	goto do_prompt;
932	}
933	}
934	n = sprintf(so_snd->sb_wptr,
935	"Error: Password required, log on with \"pass PASSWORD\"\r\n");
936	goto do_prompt;
937	}
938	cfg_quitting = 0;
939	n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
940	if (!cfg_quitting) {
941	/* Register the printed data */
942	do_prompt:
943	so_snd->sb_cc += n;
944	so_snd->sb_wptr += n;
945	/* Add prompt */
946	n = sprintf(so_snd->sb_wptr, "Slirp> ");
947	so_snd->sb_cc += n;
948	so_snd->sb_wptr += n;
949	}
950	/* Drop so_rcv data */
951	so_rcv->sb_cc = 0;
952	so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
953	tcp_output(sototcpcb(so)); /* Send the reply */
954	}
955	num++;
956	}
957	return 0;
958	}
959	#endif
960	case EMU_FTP: /* ftp */
961	(m->m_data+m->m_len) = 0; / NULL terminate for strstr */
962	if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
963	/*
964	* Need to emulate the PORT command
965	*/
966	x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
967	&n1, &n2, &n3, &n4, &n5, &n6, buff);
968	if (x < 6)
969	return 1;
970
971	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
972	lport = htons((n5 << 8) \| (n6));
973
974	if ((so = solisten(pData, 0, laddr, lport, SS_FACCEPTONCE)) == NULL)
975	return 1;
976
977	n6 = ntohs(so->so_fport);
978
979	n5 = (n6 >> 8) & 0xff;
980	n6 &= 0xff;
981
982	laddr = ntohl(so->so_faddr.s_addr);
983
984	n1 = ((laddr >> 24) & 0xff);
985	n2 = ((laddr >> 16) & 0xff);
986	n3 = ((laddr >> 8) & 0xff);
987	n4 = (laddr & 0xff);
988
989	m->m_len = bptr - m->m_data; /* Adjust length */
990	m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
991	n1, n2, n3, n4, n5, n6, x==7?buff:"");
992	return 1;
993	} else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
994	/*
995	* Need to emulate the PASV response
996	*/
997	x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
998	&n1, &n2, &n3, &n4, &n5, &n6, buff);
999	if (x < 6)
1000	return 1;
1001
1002	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1003	lport = htons((n5 << 8) \| (n6));
1004
1005	if ((so = solisten(pData, 0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1006	return 1;
1007
1008	n6 = ntohs(so->so_fport);
1009
1010	n5 = (n6 >> 8) & 0xff;
1011	n6 &= 0xff;
1012
1013	laddr = ntohl(so->so_faddr.s_addr);
1014
1015	n1 = ((laddr >> 24) & 0xff);
1016	n2 = ((laddr >> 16) & 0xff);
1017	n3 = ((laddr >> 8) & 0xff);
1018	n4 = (laddr & 0xff);
1019
1020	m->m_len = bptr - m->m_data; /* Adjust length */
1021	m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1022	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1023
1024	return 1;
1025	}
1026
1027	return 1;
1028
1029	case EMU_KSH:
1030	/*
1031	* The kshell (Kerberos rsh) and shell services both pass
1032	* a local port port number to carry signals to the server
1033	* and stderr to the client. It is passed at the beginning
1034	* of the connection as a NUL-terminated decimal ASCII string.
1035	*/
1036	so->so_emu = 0;
1037	for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1038	if (m->m_data[i] < '0' \|\| m->m_data[i] > '9')
1039	return 1; /* invalid number */
1040	lport *= 10;
1041	lport += m->m_data[i] - '0';
1042	}
1043	if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1044	(so = solisten(pData, 0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1045	m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
1046	return 1;
1047
1048	case EMU_IRC:
1049	/*
1050	* Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1051	*/
1052	(m->m_data+m->m_len) = 0; / NULL terminate the string for strstr */
1053	if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1054	return 1;
1055
1056	/* The %256s is for the broken mIRC */
1057	if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1058	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1059	return 1;
1060
1061	m->m_len = bptr - m->m_data; /* Adjust length */
1062	m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
1063	(unsigned long)ntohl(so->so_faddr.s_addr),
1064	ntohs(so->so_fport), 1);
1065	} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1066	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1067	return 1;
1068
1069	m->m_len = bptr - m->m_data; /* Adjust length */
1070	m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
1071	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1072	ntohs(so->so_fport), n1, 1);
1073	} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1074	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1075	return 1;
1076
1077	m->m_len = bptr - m->m_data; /* Adjust length */
1078	m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
1079	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1080	ntohs(so->so_fport), n1, 1);
1081	}
1082	return 1;
1083
1084	#ifdef VBOX
1085	/** @todo Disabled EMU_REALAUDIO, because it uses a static variable.
1086	* This is not legal when more than one slirp instance is active. */
1087	#else /* !VBOX */
1088	case EMU_REALAUDIO:
1089	/*
1090	* RealAudio emulation - JP. We must try to parse the incoming
1091	* data and try to find the two characters that contain the
1092	* port number. Then we redirect an udp port and replace the
1093	* number with the real port we got.
1094	*
1095	* The 1.0 beta versions of the player are not supported
1096	* any more.
1097	*
1098	* A typical packet for player version 1.0 (release version):
1099	*
1100	* 0000:50 4E 41 00 05
1101	* 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....×..gælÜc..P
1102	* 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1103	* 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1104	* 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1105	*
1106	* Now the port number 0x1BD7 is found at offset 0x04 of the
1107	* Now the port number 0x1BD7 is found at offset 0x04 of the
1108	* second packet. This time we received five bytes first and
1109	* then the rest. You never know how many bytes you get.
1110	*
1111	* A typical packet for player version 2.0 (beta):
1112	*
1113	* 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........Á.
1114	* 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..Win2.0.0
1115	* 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1116	* 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1117	* 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1118	*
1119	* Port number 0x1BC1 is found at offset 0x0d.
1120	*
1121	* This is just a horrible switch statement. Variable ra tells
1122	* us where we're going.
1123	*/
1124
1125	bptr = m->m_data;
1126	while (bptr < m->m_data + m->m_len) {
1127	u_short p;
1128	static int ra = 0;
1129	char ra_tbl[4];
1130
1131	ra_tbl[0] = 0x50;
1132	ra_tbl[1] = 0x4e;
1133	ra_tbl[2] = 0x41;
1134	ra_tbl[3] = 0;
1135
1136	switch (ra) {
1137	case 0:
1138	case 2:
1139	case 3:
1140	if (*bptr++ != ra_tbl[ra]) {
1141	ra = 0;
1142	continue;
1143	}
1144	break;
1145
1146	case 1:
1147	/*
1148	* We may get 0x50 several times, ignore them
1149	*/
1150	if (*bptr == 0x50) {
1151	ra = 1;
1152	bptr++;
1153	continue;
1154	} else if (*bptr++ != ra_tbl[ra]) {
1155	ra = 0;
1156	continue;
1157	}
1158	break;
1159
1160	case 4:
1161	/*
1162	* skip version number
1163	*/
1164	bptr++;
1165	break;
1166
1167	case 5:
1168	/*
1169	* The difference between versions 1.0 and
1170	* 2.0 is here. For future versions of
1171	* the player this may need to be modified.
1172	*/
1173	if (*(bptr + 1) == 0x02)
1174	bptr += 8;
1175	else
1176	bptr += 4;
1177	break;
1178
1179	case 6:
1180	/* This is the field containing the port
1181	* number that RA-player is listening to.
1182	*/
1183	lport = (((u_char*)bptr)[0] << 8)
1184	+ ((u_char *)bptr)[1];
1185	if (lport < 6970)
1186	lport += 256; /* don't know why */
1187	if (lport < 6970 \|\| lport > 7170)
1188	return 1; /* failed */
1189
1190	/* try to get udp port between 6970 - 7170 */
1191	for (p = 6970; p < 7071; p++) {
1192	if (udp_listen( htons(p),
1193	so->so_laddr.s_addr,
1194	htons(lport),
1195	SS_FACCEPTONCE)) {
1196	break;
1197	}
1198	}
1199	if (p == 7071)
1200	p = 0;
1201	(u_char )bptr++ = (p >> 8) & 0xff;
1202	(u_char )bptr++ = p & 0xff;
1203	ra = 0;
1204	return 1; /* port redirected, we're done */
1205	break;
1206
1207	default:
1208	ra = 0;
1209	}
1210	ra++;
1211	}
1212	return 1;
1213	#endif /* !VBOX */
1214
1215	default:
1216	/* Ooops, not emulated, won't call tcp_emu again */
1217	so->so_emu = 0;
1218	return 1;
1219	}
1220	}
1221
1222	/*
1223	* Do misc. config of SLiRP while its running.
1224	* Return 0 if this connections is to be closed, 1 otherwise,
1225	* return 2 if this is a command-line connection
1226	*/
1227	int
1228	tcp_ctl(PNATState pData, struct socket *so)
1229	{
1230	struct sbuf *sb = &so->so_snd;
1231	int command;
1232	struct ex_list *ex_ptr;
1233	int do_pty;
1234	/* struct socket tmpso; /
1235
1236	DEBUG_CALL("tcp_ctl");
1237	DEBUG_ARG("so = %lx", (long )so);
1238
1239	#if 0
1240	/*
1241	* Check if they're authorised
1242	*/
1243	if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 \|\| (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1244	sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1245	sb->sb_wptr += sb->sb_cc;
1246	return 0;
1247	}
1248	#endif
1249	command = (ntohl(so->so_faddr.s_addr) & 0xff);
1250
1251	switch(command) {
1252	default: /* Check for exec's */
1253
1254	/*
1255	* Check if it's pty_exec
1256	*/
1257	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1258	if (ex_ptr->ex_fport == so->so_fport &&
1259	command == ex_ptr->ex_addr) {
1260	do_pty = ex_ptr->ex_pty;
1261	goto do_exec;
1262	}
1263	}
1264
1265	/*
1266	* Nothing bound..
1267	*/
1268	/* tcp_fconnect(so); */
1269
1270	/* FALLTHROUGH */
1271	case CTL_ALIAS:
1272	sb->sb_cc = sprintf(sb->sb_wptr,
1273	"Error: No application configured.\r\n");
1274	sb->sb_wptr += sb->sb_cc;
1275	return(0);
1276
1277	do_exec:
1278	DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1279	return(fork_exec(pData, so, ex_ptr->ex_exec, do_pty));
1280
1281	#if 0
1282	case CTL_CMD:
1283	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1284	if (tmpso->so_emu == EMU_CTL &&
1285	!(tmpso->so_tcpcb?
1286	(tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT\|TCPS_LAST_ACK))
1287	:0)) {
1288	/* Ooops, control connection already active */
1289	sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1290	sb->sb_wptr += sb->sb_cc;
1291	return 0;
1292	}
1293	}
1294	so->so_emu = EMU_CTL;
1295	ctl_password_ok = 0;
1296	sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1297	sb->sb_wptr += sb->sb_cc;
1298	do_echo=-1;
1299	return(2);
1300	#endif
1301	}
1302	}
1303
1304	#if SIZEOF_CHAR_P != 4
1305	/**
1306	* Slow pointer hashing that deals with automatic inserting and collisions.
1307	*/
1308	uint32_t VBoxU32PtrHashSlow(PNATState pData, void *pv)
1309	{
1310	uint32_t i;
1311	if (pv == NULL)
1312	i = 0;
1313	else
1314	{
1315	const uint32_t i1 = ((uintptr_t)pv >> 3) % RT_ELEMENTS(pData->apvHash);
1316	if (pData->apvHash[i1] == pv)
1317	i = i1;
1318	else
1319	{
1320	/*
1321	* Try up to 10 times then assume it's an insertion.
1322	* If we didn't find a free entry by then, try another 100 times.
1323	* If that fails, give up.
1324	*/
1325	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1326	uint32_t i1stFree = pData->apvHash[i1] ? 0 : i1;
1327	int cTries = 10;
1328	int cTries2 = 100;
1329
1330	i = i1;
1331	for (;;)
1332	{
1333	/* check if we should give in.*/
1334	if (--cTries > 0)
1335	{
1336	if (i1stFree != 0)
1337	{
1338	i = i1stFree;
1339	pData->apvHash[i] = pv;
1340	pData->cpvHashUsed++;
1341	if (i != i1)
1342	pData->cpvHashCollisions++;
1343	pData->cpvHashInserts++;
1344	break;
1345	}
1346	if (!cTries2)
1347	{
1348	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p cpvHashUsed=%d cpvHashCollisions=%u\n",
1349	pv, pData->cpvHashUsed, pData->cpvHashCollisions));
1350	i = 0;
1351	break;
1352	}
1353	cTries = cTries2;
1354	cTries2 = 0;
1355	}
1356
1357	/* advance to the next hash entry and test it. */
1358	i = (i + i2) % RT_ELEMENTS(pData->apvHash);
1359	while (RT_UNLIKELY(!i))
1360	i = (i + i2) % RT_ELEMENTS(pData->apvHash);
1361	if (pData->apvHash[i] == pv)
1362	break;
1363	if (RT_UNLIKELY(!i1stFree && !pData->apvHash[i]))
1364	i1stFree = i;
1365	}
1366	}
1367	}
1368	return i;
1369	}
1370
1371
1372	/**
1373	* Removes the pointer from the hash table.
1374	*/
1375	void VBoxU32PtrDone(PNATState pData, void *pv, uint32_t iHint)
1376	{
1377	/* We don't count NULL pointers. */
1378	if (pv == NULL)
1379	return;
1380	pData->cpvHashDone++;
1381
1382	/* try the hint */
1383	if ( iHint
1384	&& iHint < RT_ELEMENTS(pData->apvHash)
1385	&& pData->apvHash[iHint] == pv)
1386	{
1387	pData->apvHash[iHint] = NULL;
1388	pData->cpvHashUsed--;
1389	return;
1390	}
1391
1392	iHint = ((uintptr_t)pv >> 3) % RT_ELEMENTS(pData->apvHash);
1393	if (RT_UNLIKELY(pData->apvHash[iHint] != pv))
1394	{
1395	/*
1396	* Try up to 120 times then assert.
1397	*/
1398	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1399	int cTries = 120;
1400	for (;;)
1401	{
1402	/* advance to the next hash entry and test it. */
1403	iHint = (iHint + i2) % RT_ELEMENTS(pData->apvHash);
1404	while (RT_UNLIKELY(!iHint))
1405	iHint = (iHint + i2) % RT_ELEMENTS(pData->apvHash);
1406	if (pData->apvHash[iHint] == pv)
1407	break;
1408
1409	/* check if we should give in.*/
1410	if (--cTries > 0)
1411	{
1412	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p cpvHashUsed=%u cpvHashCollisions=%u\n",
1413	pv, pData->cpvHashUsed, pData->cpvHashCollisions));
1414	return;
1415	}
1416	}
1417	}
1418
1419	/* found it */
1420	pData->apvHash[iHint] = NULL;
1421	pData->cpvHashUsed--;
1422	}
1423
1424	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/tcp_subr.c@ 14275

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