tcp_subr.c@ 13733

Last change on this file since 13733 was 13733, checked in by vboxsync, 16 years ago
The rest of macro replacment was added
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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	tp->seg_next = tp->seg_prev = ptr_to_u32(pData, (struct tcpiphdr *)tp);
192	tp->t_maxseg = tcp_mssdflt;
193
194	tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE\|TF_REQ_TSTMP) : 0;
195	tp->t_socket = so;
196
197	/*
198	* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
199	* rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
200	* reasonable initial retransmit time.
201	*/
202	tp->t_srtt = TCPTV_SRTTBASE;
203	tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
204	tp->t_rttmin = TCPTV_MIN;
205
206	TCPT_RANGESET(tp->t_rxtcur,
207	((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
208	TCPTV_MIN, TCPTV_REXMTMAX);
209
210	tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
211	tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
212	tp->t_state = TCPS_CLOSED;
213
214	so->so_tcpcb = tp;
215
216	return (tp);
217	}
218
219	/*
220	* Drop a TCP connection, reporting
221	* the specified error. If connection is synchronized,
222	* then send a RST to peer.
223	*/
224	struct tcpcb tcp_drop(PNATState pData, struct tcpcb tp, int err)
225	{
226	/* tcp_drop(tp, errno)
227	register struct tcpcb *tp;
228	int errno;
229	{
230	*/
231
232	DEBUG_CALL("tcp_drop");
233	DEBUG_ARG("tp = %lx", (long)tp);
234	DEBUG_ARG("errno = %d", errno);
235
236	if (TCPS_HAVERCVDSYN(tp->t_state)) {
237	tp->t_state = TCPS_CLOSED;
238	(void) tcp_output(pData, tp);
239	tcpstat.tcps_drops++;
240	} else
241	tcpstat.tcps_conndrops++;
242	/* if (errno == ETIMEDOUT && tp->t_softerror)
243	* errno = tp->t_softerror;
244	*/
245	/* so->so_error = errno; */
246	return (tcp_close(pData, tp));
247	}
248
249	/*
250	* Close a TCP control block:
251	* discard all space held by the tcp
252	* discard internet protocol block
253	* wake up any sleepers
254	*/
255	struct tcpcb *
256	tcp_close(PNATState pData, register struct tcpcb *tp)
257	{
258	register struct tcpiphdr *t;
259	struct socket *so = tp->t_socket;
260	register struct mbuf *m;
261
262	DEBUG_CALL("tcp_close");
263	DEBUG_ARG("tp = %lx", (long )tp);
264
265	/* free the reassembly queue, if any */
266	t = u32_to_ptr(pData, tp->seg_next, struct tcpiphdr *);
267	while (t != (struct tcpiphdr *)tp) {
268	t = u32_to_ptr(pData, t->ti_next, struct tcpiphdr *);
269	m = REASS_MBUF_GET(u32_to_ptr(pData, t->ti_prev, struct tcpiphdr *));
270	remque_32(pData, u32_to_ptr(pData, t->ti_prev, struct tcpiphdr *));
271	m_freem(pData, m);
272	}
273	/* It's static */
274	/* if (tp->t_template)
275	* (void) m_free(dtom(tp->t_template));
276	*/
277	/* free(tp, M_PCB); */
278	VBOX_SLIRP_LOCK(so->so_mutex);
279
280	u32ptr_done(pData, ptr_to_u32(pData, tp), tp);
281	free(tp);
282	so->so_tcpcb = 0;
283	soisfdisconnected(so);
284	VBOX_SLIRP_LOCK(pData->tcp_last_so_mutex);
285	/* clobber input socket cache if we're closing the cached connection */
286	if (so == tcp_last_so)
287	tcp_last_so = &tcb;
288	VBOX_SLIRP_UNLOCK(pData->tcp_last_so_mutex);
289	closesocket(so->s);
290	sbfree(&so->so_rcv);
291	sbfree(&so->so_snd);
292	sofree(pData, so);
293	if(so != NULL) VBOX_SLIRP_LOCK(so->so_mutex);
294	tcpstat.tcps_closed++;
295	return ((struct tcpcb *)0);
296	}
297
298	void
299	tcp_drain()
300	{
301	/* XXX */
302	}
303
304	/*
305	* When a source quench is received, close congestion window
306	* to one segment. We will gradually open it again as we proceed.
307	*/
308
309	#ifdef notdef
310
311	void
312	tcp_quench(i, errno)
313
314	int errno;
315	{
316	struct tcpcb *tp = intotcpcb(inp);
317
318	if (tp)
319	tp->snd_cwnd = tp->t_maxseg;
320	}
321
322	#endif /* notdef */
323
324	/*
325	* TCP protocol interface to socket abstraction.
326	*/
327
328	/*
329	* User issued close, and wish to trail through shutdown states:
330	* if never received SYN, just forget it. If got a SYN from peer,
331	* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
332	* If already got a FIN from peer, then almost done; go to LAST_ACK
333	* state. In all other cases, have already sent FIN to peer (e.g.
334	* after PRU_SHUTDOWN), and just have to play tedious game waiting
335	* for peer to send FIN or not respond to keep-alives, etc.
336	* We can let the user exit from the close as soon as the FIN is acked.
337	*/
338	void
339	tcp_sockclosed(PNATState pData, struct tcpcb *tp)
340	{
341
342	DEBUG_CALL("tcp_sockclosed");
343	DEBUG_ARG("tp = %lx", (long)tp);
344
345	switch (tp->t_state) {
346
347	case TCPS_CLOSED:
348	case TCPS_LISTEN:
349	case TCPS_SYN_SENT:
350	tp->t_state = TCPS_CLOSED;
351	tp = tcp_close(pData, tp);
352	break;
353
354	case TCPS_SYN_RECEIVED:
355	case TCPS_ESTABLISHED:
356	tp->t_state = TCPS_FIN_WAIT_1;
357	break;
358
359	case TCPS_CLOSE_WAIT:
360	tp->t_state = TCPS_LAST_ACK;
361	break;
362	}
363	/* soisfdisconnecting(tp->t_socket); */
364	if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
365	soisfdisconnected(tp->t_socket);
366	if (tp)
367	tcp_output(pData, tp);
368	}
369
370	/*
371	* Connect to a host on the Internet
372	* Called by tcp_input
373	* Only do a connect, the tcp fields will be set in tcp_input
374	* return 0 if there's a result of the connect,
375	* else return -1 means we're still connecting
376	* The return value is almost always -1 since the socket is
377	* nonblocking. Connect returns after the SYN is sent, and does
378	* not wait for ACK+SYN.
379	*/
380	int tcp_fconnect(PNATState pData, struct socket *so)
381	{
382	int ret=0;
383
384	DEBUG_CALL("tcp_fconnect");
385	DEBUG_ARG("so = %lx", (long )so);
386
387	if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
388	int opt, s=so->s;
389	struct sockaddr_in addr;
390
391	fd_nonblock(s);
392	opt = 1;
393	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
394	opt = 1;
395	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
396
397	addr.sin_family = AF_INET;
398	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr) {
399	/* It's an alias */
400	switch(ntohl(so->so_faddr.s_addr) & ~pData->netmask) {
401	case CTL_DNS:
402	if (!get_dns_addr(pData, &dns_addr))
403	addr.sin_addr = dns_addr;
404	else
405	addr.sin_addr = loopback_addr;
406	break;
407	case CTL_ALIAS:
408	default:
409	addr.sin_addr = loopback_addr;
410	break;
411	}
412	} else
413	addr.sin_addr = so->so_faddr;
414	addr.sin_port = so->so_fport;
415
416	DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
417	"addr.sin_addr.s_addr=%.16s\n",
418	ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
419	/* We don't care what port we get */
420	ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
421
422	/*
423	* If it's not in progress, it failed, so we just return 0,
424	* without clearing SS_NOFDREF
425	*/
426	soisfconnecting(so);
427	}
428
429	return(ret);
430	}
431
432	/*
433	* Accept the socket and connect to the local-host
434	*
435	* We have a problem. The correct thing to do would be
436	* to first connect to the local-host, and only if the
437	* connection is accepted, then do an accept() here.
438	* But, a) we need to know who's trying to connect
439	* to the socket to be able to SYN the local-host, and
440	* b) we are already connected to the foreign host by
441	* the time it gets to accept(), so... We simply accept
442	* here and SYN the local-host.
443	*/
444	void
445	tcp_connect(PNATState pData, struct socket *inso)
446	{
447	struct socket *so;
448	struct sockaddr_in addr;
449	socklen_t addrlen = sizeof(struct sockaddr_in);
450	struct tcpcb *tp;
451	int s, opt;
452
453	DEBUG_CALL("tcp_connect");
454	DEBUG_ARG("inso = %lx", (long)inso);
455	VBOX_SLIRP_LOCK(inso->so_mutex);
456
457	/*
458	* If it's an SS_ACCEPTONCE socket, no need to socreate()
459	* another socket, just use the accept() socket.
460	*/
461	if (inso->so_state & SS_FACCEPTONCE) {
462	/* FACCEPTONCE already have a tcpcb */
463	so = inso;
464	} else {
465	VBOX_SLIRP_UNLOCK(inso->so_mutex);
466	if ((so = socreate()) == NULL) {
467	/* If it failed, get rid of the pending connection */
468	closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
469	VBOX_SLIRP_UNLOCK(inso->so_mutex);
470	return;
471	}
472	VBOX_SLIRP_LOCK(so->so_mutex);
473	if (tcp_attach(pData, so) < 0) {
474	if(so != NULL) VBOX_SLIRP_UNLOCK(so->so_mutex);
475	free(so); /* NOT sofree */
476	return;
477	}
478	so->so_laddr = inso->so_laddr;
479	so->so_lport = inso->so_lport;
480	}
481
482	(void) tcp_mss(pData, sototcpcb(so), 0);
483
484	if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
485	tcp_close(pData, sototcpcb(so)); /* This will sofree() as well */
486	if (so != inso) {
487	VBOX_SLIRP_UNLOCK(inso->so_mutex);
488	}
489	VBOX_SLIRP_UNLOCK(so->so_mutex);
490	return;
491	}
492	fd_nonblock(s);
493	opt = 1;
494	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
495	opt = 1;
496	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
497	opt = 1;
498	setsockopt(s,IPPROTO_TCP,TCP_NODELAY,(char *)&opt,sizeof(int));
499
500	so->so_fport = addr.sin_port;
501	so->so_faddr = addr.sin_addr;
502	/* Translate connections from localhost to the real hostname */
503	if (so->so_faddr.s_addr == 0 \|\| so->so_faddr.s_addr == loopback_addr.s_addr)
504	so->so_faddr = alias_addr;
505
506	/* Close the accept() socket, set right state */
507	if (inso->so_state & SS_FACCEPTONCE) {
508	closesocket(so->s); /* If we only accept once, close the accept() socket */
509	so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
510	/* if it's not FACCEPTONCE, it's already NOFDREF */
511	}
512	if (so != inso) {
513	VBOX_SLIRP_UNLOCK(inso->so_mutex);
514	}
515	so->s = s;
516
517	so->so_iptos = tcp_tos(so);
518	tp = sototcpcb(so);
519
520	tcp_template(tp);
521
522	/* Compute window scaling to request. */
523	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
524	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
525	* tp->request_r_scale++;
526	*/
527
528	/* soisconnecting(so); / / NOFDREF used instead */
529	tcpstat.tcps_connattempt++;
530
531	tp->t_state = TCPS_SYN_SENT;
532	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
533	tp->iss = tcp_iss;
534	tcp_iss += TCP_ISSINCR/2;
535	tcp_sendseqinit(tp);
536	tcp_output(pData, tp);
537	VBOX_SLIRP_UNLOCK(so->so_mutex);
538	}
539
540	/*
541	* Attach a TCPCB to a socket.
542	*/
543	int
544	tcp_attach(PNATState pData, struct socket *so)
545	{
546	if ((so->so_tcpcb = tcp_newtcpcb(pData, so)) == NULL){
547	return -1;
548	}
549
550
551	VBOX_SLIRP_LOCK(pData->tcb_mutex);
552	VBOX_SLIRP_LOCK(so->so_mutex);
553	insque(pData, so, &tcb);
554	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
555
556	#ifdef VBOX_WITH_SYNC_SLIRP
557	/we use this field to identify cache socket to lock/unlock/
558	so->so_type = IPPROTO_TCP;
559	#endif
560
561	VBOX_SLIRP_UNLOCK(so->so_mutex);
562	return 0;
563	}
564
565	/*
566	* Set the socket's type of service field
567	*/
568	static const struct tos_t tcptos[] = {
569	{0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
570	{21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
571	{0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
572	{0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
573	{0, 513, IPTOS_LOWDELAY, EMU_RLOGIN\|EMU_NOCONNECT}, /* rlogin */
574	{0, 514, IPTOS_LOWDELAY, EMU_RSH\|EMU_NOCONNECT}, /* shell */
575	{0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
576	{0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
577	{0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
578	{0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
579	{0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
580	{0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
581	{0, 0, 0, 0}
582	};
583
584	/*
585	* Return TOS according to the above table
586	*/
587	u_int8_t
588	tcp_tos(so)
589	struct socket *so;
590	{
591	int i = 0;
592
593	while(tcptos[i].tos) {
594	if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) \|\|
595	(tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
596	so->so_emu = tcptos[i].emu;
597	return tcptos[i].tos;
598	}
599	i++;
600	}
601
602	return 0;
603	}
604
605	/*
606	* Emulate programs that try and connect to us
607	* This includes ftp (the data connection is
608	* initiated by the server) and IRC (DCC CHAT and
609	* DCC SEND) for now
610	*
611	* NOTE: It's possible to crash SLiRP by sending it
612	* unstandard strings to emulate... if this is a problem,
613	* more checks are needed here
614	*
615	* XXX Assumes the whole command came in one packet
616	*
617	* XXX Some ftp clients will have their TOS set to
618	* LOWDELAY and so Nagel will kick in. Because of this,
619	* we'll get the first letter, followed by the rest, so
620	* we simply scan for ORT instead of PORT...
621	* DCC doesn't have this problem because there's other stuff
622	* in the packet before the DCC command.
623	*
624	* Return 1 if the mbuf m is still valid and should be
625	* sbappend()ed
626	*
627	* NOTE: if you return 0 you MUST m_free() the mbuf!
628	*/
629	int
630	tcp_emu(PNATState pData, struct socket so, struct mbuf m)
631	{
632	u_int n1, n2, n3, n4, n5, n6;
633	char buff[256];
634	u_int32_t laddr;
635	u_int lport;
636	char *bptr;
637
638	DEBUG_CALL("tcp_emu");
639	DEBUG_ARG("so = %lx", (long)so);
640	DEBUG_ARG("m = %lx", (long)m);
641
642	switch(so->so_emu) {
643	int x, i;
644
645	case EMU_IDENT:
646	/*
647	* Identification protocol as per rfc-1413
648	*/
649
650	{
651	struct socket *tmpso;
652	struct sockaddr_in addr;
653	socklen_t addrlen = sizeof(struct sockaddr_in);
654	struct sbuf *so_rcv = &so->so_rcv;
655
656	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
657	so_rcv->sb_wptr += m->m_len;
658	so_rcv->sb_rptr += m->m_len;
659	m->m_data[m->m_len] = 0; /* NULL terminate */
660	if (strchr(m->m_data, '\r') \|\| strchr(m->m_data, '\n')) {
661	if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
662	HTONS(n1);
663	HTONS(n2);
664	/* n2 is the one on our host */
665	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
666	if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
667	tmpso->so_lport == n2 &&
668	tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
669	tmpso->so_fport == n1) {
670	if (getsockname(tmpso->s,
671	(struct sockaddr *)&addr, &addrlen) == 0)
672	n2 = ntohs(addr.sin_port);
673	break;
674	}
675	}
676	}
677	so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
678	so_rcv->sb_rptr = so_rcv->sb_data;
679	so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
680	}
681	m_free(pData, m);
682	return 0;
683	}
684
685	#if 0
686	case EMU_RLOGIN:
687	/*
688	* Rlogin emulation
689	* First we accumulate all the initial option negotiation,
690	* then fork_exec() rlogin according to the options
691	*/
692	{
693	int i, i2, n;
694	char *ptr;
695	char args[100];
696	char term[100];
697	struct sbuf *so_snd = &so->so_snd;
698	struct sbuf *so_rcv = &so->so_rcv;
699
700	/* First check if they have a priveladged port, or too much data has arrived */
701	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
702	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
703	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
704	so_snd->sb_wptr += 18;
705	so_snd->sb_cc += 18;
706	tcp_sockclosed(sototcpcb(so));
707	m_free(m);
708	return 0;
709	}
710
711	/* Append the current data */
712	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
713	so_rcv->sb_wptr += m->m_len;
714	so_rcv->sb_rptr += m->m_len;
715	m_free(m);
716
717	/*
718	* Check if we have all the initial options,
719	* and build argument list to rlogin while we're here
720	*/
721	n = 0;
722	ptr = so_rcv->sb_data;
723	args[0] = 0;
724	term[0] = 0;
725	while (ptr < so_rcv->sb_wptr) {
726	if (*ptr++ == 0) {
727	n++;
728	if (n == 2) {
729	sprintf(args, "rlogin -l %s %s",
730	ptr, inet_ntoa(so->so_faddr));
731	} else if (n == 3) {
732	i2 = so_rcv->sb_wptr - ptr;
733	for (i = 0; i < i2; i++) {
734	if (ptr[i] == '/') {
735	ptr[i] = 0;
736	#ifdef HAVE_SETENV
737	sprintf(term, "%s", ptr);
738	#else
739	sprintf(term, "TERM=%s", ptr);
740	#endif
741	ptr[i] = '/';
742	break;
743	}
744	}
745	}
746	}
747	}
748
749	if (n != 4)
750	return 0;
751
752	/* We have it, set our term variable and fork_exec() */
753	#ifdef HAVE_SETENV
754	setenv("TERM", term, 1);
755	#else
756	putenv(term);
757	#endif
758	fork_exec(so, args, 2);
759	term[0] = 0;
760	so->so_emu = 0;
761
762	/* And finally, send the client a 0 character */
763	so_snd->sb_wptr[0] = 0;
764	so_snd->sb_wptr++;
765	so_snd->sb_cc++;
766
767	return 0;
768	}
769
770	case EMU_RSH:
771	/*
772	* rsh emulation
773	* First we accumulate all the initial option negotiation,
774	* then rsh_exec() rsh according to the options
775	*/
776	{
777	int n;
778	char *ptr;
779	char *user;
780	char *args;
781	struct sbuf *so_snd = &so->so_snd;
782	struct sbuf *so_rcv = &so->so_rcv;
783
784	/* First check if they have a priveladged port, or too much data has arrived */
785	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
786	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
787	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
788	so_snd->sb_wptr += 18;
789	so_snd->sb_cc += 18;
790	tcp_sockclosed(sototcpcb(so));
791	m_free(m);
792	return 0;
793	}
794
795	/* Append the current data */
796	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
797	so_rcv->sb_wptr += m->m_len;
798	so_rcv->sb_rptr += m->m_len;
799	m_free(m);
800
801	/*
802	* Check if we have all the initial options,
803	* and build argument list to rlogin while we're here
804	*/
805	n = 0;
806	ptr = so_rcv->sb_data;
807	user="";
808	args="";
809	if (so->extra==NULL) {
810	struct socket *ns;
811	struct tcpcb* tp;
812	int port=atoi(ptr);
813	if (port <= 0) return 0;
814	if (port > 1023 \|\| port < 512) {
815	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
816	so_snd->sb_wptr += 18;
817	so_snd->sb_cc += 18;
818	tcp_sockclosed(sototcpcb(so));
819	return 0;
820	}
821	if ((ns=socreate()) == NULL)
822	return 0;
823	if (tcp_attach(ns)<0) {
824	free(ns);
825	return 0;
826	}
827
828	ns->so_laddr=so->so_laddr;
829	ns->so_lport=htons(port);
830
831	(void) tcp_mss(sototcpcb(ns), 0);
832
833	ns->so_faddr=so->so_faddr;
834	ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
835
836	if (ns->so_faddr.s_addr == 0 \|\|
837	ns->so_faddr.s_addr == loopback_addr.s_addr)
838	ns->so_faddr = alias_addr;
839
840	ns->so_iptos = tcp_tos(ns);
841	tp = sototcpcb(ns);
842
843	tcp_template(tp);
844
845	/* Compute window scaling to request. */
846	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
847	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
848	* tp->request_r_scale++;
849	*/
850
851	/soisfconnecting(ns);/
852
853	tcpstat.tcps_connattempt++;
854
855	tp->t_state = TCPS_SYN_SENT;
856	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
857	tp->iss = tcp_iss;
858	tcp_iss += TCP_ISSINCR/2;
859	tcp_sendseqinit(tp);
860	tcp_output(tp);
861	so->extra=ns;
862	}
863	while (ptr < so_rcv->sb_wptr) {
864	if (*ptr++ == 0) {
865	n++;
866	if (n == 2) {
867	user=ptr;
868	} else if (n == 3) {
869	args=ptr;
870	}
871	}
872	}
873
874	if (n != 4)
875	return 0;
876
877	rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
878	so->so_emu = 0;
879	so->extra=NULL;
880
881	/* And finally, send the client a 0 character */
882	so_snd->sb_wptr[0] = 0;
883	so_snd->sb_wptr++;
884	so_snd->sb_cc++;
885
886	return 0;
887	}
888
889	case EMU_CTL:
890	{
891	int num;
892	struct sbuf *so_snd = &so->so_snd;
893	struct sbuf *so_rcv = &so->so_rcv;
894
895	/*
896	* If there is binary data here, we save it in so->so_m
897	*/
898	if (!so->so_m) {
899	int rxlen;
900	char *rxdata;
901	rxdata=mtod(m, char *);
902	for (rxlen=m->m_len; rxlen; rxlen--) {
903	if (*rxdata++ & 0x80) {
904	so->so_m = m;
905	return 0;
906	}
907	}
908	} /* if(so->so_m==NULL) */
909
910	/*
911	* Append the line
912	*/
913	sbappendsb(so_rcv, m);
914
915	/* To avoid going over the edge of the buffer, we reset it */
916	if (so_snd->sb_cc == 0)
917	so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
918
919	/*
920	* A bit of a hack:
921	* If the first packet we get here is 1 byte long, then it
922	* was done in telnet character mode, therefore we must echo
923	* the characters as they come. Otherwise, we echo nothing,
924	* because in linemode, the line is already echoed
925	* XXX two or more control connections won't work
926	*/
927	if (do_echo == -1) {
928	if (m->m_len == 1) do_echo = 1;
929	else do_echo = 0;
930	}
931	if (do_echo) {
932	sbappendsb(so_snd, m);
933	m_free(m);
934	tcp_output(sototcpcb(so)); /* XXX */
935	} else
936	m_free(m);
937
938	num = 0;
939	while (num < so->so_rcv.sb_cc) {
940	if (*(so->so_rcv.sb_rptr + num) == '\n' \|\|
941	*(so->so_rcv.sb_rptr + num) == '\r') {
942	int n;
943
944	*(so_rcv->sb_rptr + num) = 0;
945	if (ctl_password && !ctl_password_ok) {
946	/* Need a password */
947	if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
948	if (strcmp(buff, ctl_password) == 0) {
949	ctl_password_ok = 1;
950	n = sprintf(so_snd->sb_wptr,
951	"Password OK.\r\n");
952	goto do_prompt;
953	}
954	}
955	n = sprintf(so_snd->sb_wptr,
956	"Error: Password required, log on with \"pass PASSWORD\"\r\n");
957	goto do_prompt;
958	}
959	cfg_quitting = 0;
960	n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
961	if (!cfg_quitting) {
962	/* Register the printed data */
963	do_prompt:
964	so_snd->sb_cc += n;
965	so_snd->sb_wptr += n;
966	/* Add prompt */
967	n = sprintf(so_snd->sb_wptr, "Slirp> ");
968	so_snd->sb_cc += n;
969	so_snd->sb_wptr += n;
970	}
971	/* Drop so_rcv data */
972	so_rcv->sb_cc = 0;
973	so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
974	tcp_output(sototcpcb(so)); /* Send the reply */
975	}
976	num++;
977	}
978	return 0;
979	}
980	#endif
981	case EMU_FTP: /* ftp */
982	(m->m_data+m->m_len) = 0; / NULL terminate for strstr */
983	if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
984	/*
985	* Need to emulate the PORT command
986	*/
987	x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
988	&n1, &n2, &n3, &n4, &n5, &n6, buff);
989	if (x < 6)
990	return 1;
991
992	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
993	lport = htons((n5 << 8) \| (n6));
994
995	if ((so = solisten(pData, 0, laddr, lport, SS_FACCEPTONCE)) == NULL)
996	return 1;
997
998	n6 = ntohs(so->so_fport);
999
1000	n5 = (n6 >> 8) & 0xff;
1001	n6 &= 0xff;
1002
1003	laddr = ntohl(so->so_faddr.s_addr);
1004
1005	n1 = ((laddr >> 24) & 0xff);
1006	n2 = ((laddr >> 16) & 0xff);
1007	n3 = ((laddr >> 8) & 0xff);
1008	n4 = (laddr & 0xff);
1009
1010	m->m_len = bptr - m->m_data; /* Adjust length */
1011	m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
1012	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1013	return 1;
1014	} else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
1015	/*
1016	* Need to emulate the PASV response
1017	*/
1018	x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
1019	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1020	if (x < 6)
1021	return 1;
1022
1023	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1024	lport = htons((n5 << 8) \| (n6));
1025
1026	if ((so = solisten(pData, 0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1027	return 1;
1028
1029	n6 = ntohs(so->so_fport);
1030
1031	n5 = (n6 >> 8) & 0xff;
1032	n6 &= 0xff;
1033
1034	laddr = ntohl(so->so_faddr.s_addr);
1035
1036	n1 = ((laddr >> 24) & 0xff);
1037	n2 = ((laddr >> 16) & 0xff);
1038	n3 = ((laddr >> 8) & 0xff);
1039	n4 = (laddr & 0xff);
1040
1041	m->m_len = bptr - m->m_data; /* Adjust length */
1042	m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1043	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1044
1045	return 1;
1046	}
1047
1048	return 1;
1049
1050	case EMU_KSH:
1051	/*
1052	* The kshell (Kerberos rsh) and shell services both pass
1053	* a local port port number to carry signals to the server
1054	* and stderr to the client. It is passed at the beginning
1055	* of the connection as a NUL-terminated decimal ASCII string.
1056	*/
1057	so->so_emu = 0;
1058	for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1059	if (m->m_data[i] < '0' \|\| m->m_data[i] > '9')
1060	return 1; /* invalid number */
1061	lport *= 10;
1062	lport += m->m_data[i] - '0';
1063	}
1064	if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1065	(so = solisten(pData, 0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1066	m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
1067	return 1;
1068
1069	case EMU_IRC:
1070	/*
1071	* Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1072	*/
1073	(m->m_data+m->m_len) = 0; / NULL terminate the string for strstr */
1074	if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1075	return 1;
1076
1077	/* The %256s is for the broken mIRC */
1078	if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1079	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1080	return 1;
1081
1082	m->m_len = bptr - m->m_data; /* Adjust length */
1083	m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
1084	(unsigned long)ntohl(so->so_faddr.s_addr),
1085	ntohs(so->so_fport), 1);
1086	} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1087	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1088	return 1;
1089
1090	m->m_len = bptr - m->m_data; /* Adjust length */
1091	m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
1092	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1093	ntohs(so->so_fport), n1, 1);
1094	} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1095	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1096	return 1;
1097
1098	m->m_len = bptr - m->m_data; /* Adjust length */
1099	m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
1100	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1101	ntohs(so->so_fport), n1, 1);
1102	}
1103	return 1;
1104
1105	#ifdef VBOX
1106	/** @todo Disabled EMU_REALAUDIO, because it uses a static variable.
1107	* This is not legal when more than one slirp instance is active. */
1108	#else /* !VBOX */
1109	case EMU_REALAUDIO:
1110	/*
1111	* RealAudio emulation - JP. We must try to parse the incoming
1112	* data and try to find the two characters that contain the
1113	* port number. Then we redirect an udp port and replace the
1114	* number with the real port we got.
1115	*
1116	* The 1.0 beta versions of the player are not supported
1117	* any more.
1118	*
1119	* A typical packet for player version 1.0 (release version):
1120	*
1121	* 0000:50 4E 41 00 05
1122	* 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....×..gælÜc..P
1123	* 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1124	* 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1125	* 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1126	*
1127	* Now the port number 0x1BD7 is found at offset 0x04 of the
1128	* Now the port number 0x1BD7 is found at offset 0x04 of the
1129	* second packet. This time we received five bytes first and
1130	* then the rest. You never know how many bytes you get.
1131	*
1132	* A typical packet for player version 2.0 (beta):
1133	*
1134	* 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........Á.
1135	* 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..Win2.0.0
1136	* 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1137	* 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1138	* 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1139	*
1140	* Port number 0x1BC1 is found at offset 0x0d.
1141	*
1142	* This is just a horrible switch statement. Variable ra tells
1143	* us where we're going.
1144	*/
1145
1146	bptr = m->m_data;
1147	while (bptr < m->m_data + m->m_len) {
1148	u_short p;
1149	static int ra = 0;
1150	char ra_tbl[4];
1151
1152	ra_tbl[0] = 0x50;
1153	ra_tbl[1] = 0x4e;
1154	ra_tbl[2] = 0x41;
1155	ra_tbl[3] = 0;
1156
1157	switch (ra) {
1158	case 0:
1159	case 2:
1160	case 3:
1161	if (*bptr++ != ra_tbl[ra]) {
1162	ra = 0;
1163	continue;
1164	}
1165	break;
1166
1167	case 1:
1168	/*
1169	* We may get 0x50 several times, ignore them
1170	*/
1171	if (*bptr == 0x50) {
1172	ra = 1;
1173	bptr++;
1174	continue;
1175	} else if (*bptr++ != ra_tbl[ra]) {
1176	ra = 0;
1177	continue;
1178	}
1179	break;
1180
1181	case 4:
1182	/*
1183	* skip version number
1184	*/
1185	bptr++;
1186	break;
1187
1188	case 5:
1189	/*
1190	* The difference between versions 1.0 and
1191	* 2.0 is here. For future versions of
1192	* the player this may need to be modified.
1193	*/
1194	if (*(bptr + 1) == 0x02)
1195	bptr += 8;
1196	else
1197	bptr += 4;
1198	break;
1199
1200	case 6:
1201	/* This is the field containing the port
1202	* number that RA-player is listening to.
1203	*/
1204	lport = (((u_char*)bptr)[0] << 8)
1205	+ ((u_char *)bptr)[1];
1206	if (lport < 6970)
1207	lport += 256; /* don't know why */
1208	if (lport < 6970 \|\| lport > 7170)
1209	return 1; /* failed */
1210
1211	/* try to get udp port between 6970 - 7170 */
1212	for (p = 6970; p < 7071; p++) {
1213	if (udp_listen( htons(p),
1214	so->so_laddr.s_addr,
1215	htons(lport),
1216	SS_FACCEPTONCE)) {
1217	break;
1218	}
1219	}
1220	if (p == 7071)
1221	p = 0;
1222	(u_char )bptr++ = (p >> 8) & 0xff;
1223	(u_char )bptr++ = p & 0xff;
1224	ra = 0;
1225	return 1; /* port redirected, we're done */
1226	break;
1227
1228	default:
1229	ra = 0;
1230	}
1231	ra++;
1232	}
1233	return 1;
1234	#endif /* !VBOX */
1235
1236	default:
1237	/* Ooops, not emulated, won't call tcp_emu again */
1238	so->so_emu = 0;
1239	return 1;
1240	}
1241	}
1242
1243	/*
1244	* Do misc. config of SLiRP while its running.
1245	* Return 0 if this connections is to be closed, 1 otherwise,
1246	* return 2 if this is a command-line connection
1247	*/
1248	int
1249	tcp_ctl(PNATState pData, struct socket *so)
1250	{
1251	struct sbuf *sb = &so->so_snd;
1252	int command;
1253	struct ex_list *ex_ptr;
1254	int do_pty;
1255	/* struct socket tmpso; /
1256
1257	DEBUG_CALL("tcp_ctl");
1258	DEBUG_ARG("so = %lx", (long )so);
1259
1260	#if 0
1261	/*
1262	* Check if they're authorised
1263	*/
1264	if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 \|\| (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1265	sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1266	sb->sb_wptr += sb->sb_cc;
1267	return 0;
1268	}
1269	#endif
1270	command = (ntohl(so->so_faddr.s_addr) & 0xff);
1271
1272	switch(command) {
1273	default: /* Check for exec's */
1274
1275	/*
1276	* Check if it's pty_exec
1277	*/
1278	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1279	if (ex_ptr->ex_fport == so->so_fport &&
1280	command == ex_ptr->ex_addr) {
1281	do_pty = ex_ptr->ex_pty;
1282	goto do_exec;
1283	}
1284	}
1285
1286	/*
1287	* Nothing bound..
1288	*/
1289	/* tcp_fconnect(so); */
1290
1291	/* FALLTHROUGH */
1292	case CTL_ALIAS:
1293	sb->sb_cc = sprintf(sb->sb_wptr,
1294	"Error: No application configured.\r\n");
1295	sb->sb_wptr += sb->sb_cc;
1296	return(0);
1297
1298	do_exec:
1299	DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1300	return(fork_exec(pData, so, ex_ptr->ex_exec, do_pty));
1301
1302	#if 0
1303	case CTL_CMD:
1304	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1305	if (tmpso->so_emu == EMU_CTL &&
1306	!(tmpso->so_tcpcb?
1307	(tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT\|TCPS_LAST_ACK))
1308	:0)) {
1309	/* Ooops, control connection already active */
1310	sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1311	sb->sb_wptr += sb->sb_cc;
1312	return 0;
1313	}
1314	}
1315	so->so_emu = EMU_CTL;
1316	ctl_password_ok = 0;
1317	sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1318	sb->sb_wptr += sb->sb_cc;
1319	do_echo=-1;
1320	return(2);
1321	#endif
1322	}
1323	}
1324
1325	#if SIZEOF_CHAR_P != 4
1326	/**
1327	* Slow pointer hashing that deals with automatic inserting and collisions.
1328	*/
1329	uint32_t VBoxU32PtrHashSlow(PNATState pData, void *pv)
1330	{
1331	uint32_t i;
1332	if (pv == NULL)
1333	i = 0;
1334	else
1335	{
1336	const uint32_t i1 = ((uintptr_t)pv >> 3) % RT_ELEMENTS(pData->apvHash);
1337	if (pData->apvHash[i1] == pv)
1338	i = i1;
1339	else
1340	{
1341	/*
1342	* Try up to 10 times then assume it's an insertion.
1343	* If we didn't find a free entry by then, try another 100 times.
1344	* If that fails, give up.
1345	*/
1346	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1347	uint32_t i1stFree = pData->apvHash[i1] ? 0 : i1;
1348	int cTries = 10;
1349	int cTries2 = 100;
1350
1351	i = i1;
1352	for (;;)
1353	{
1354	/* check if we should give in.*/
1355	if (--cTries > 0)
1356	{
1357	if (i1stFree != 0)
1358	{
1359	i = i1stFree;
1360	pData->apvHash[i] = pv;
1361	pData->cpvHashUsed++;
1362	if (i != i1)
1363	pData->cpvHashCollisions++;
1364	pData->cpvHashInserts++;
1365	break;
1366	}
1367	if (!cTries2)
1368	{
1369	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p cpvHashUsed=%d cpvHashCollisions=%u\n",
1370	pv, pData->cpvHashUsed, pData->cpvHashCollisions));
1371	i = 0;
1372	break;
1373	}
1374	cTries = cTries2;
1375	cTries2 = 0;
1376	}
1377
1378	/* advance to the next hash entry and test it. */
1379	i = (i + i2) % RT_ELEMENTS(pData->apvHash);
1380	while (RT_UNLIKELY(!i))
1381	i = (i + i2) % RT_ELEMENTS(pData->apvHash);
1382	if (pData->apvHash[i] == pv)
1383	break;
1384	if (RT_UNLIKELY(!i1stFree && !pData->apvHash[i]))
1385	i1stFree = i;
1386	}
1387	}
1388	}
1389	return i;
1390	}
1391
1392
1393	/**
1394	* Removes the pointer from the hash table.
1395	*/
1396	void VBoxU32PtrDone(PNATState pData, void *pv, uint32_t iHint)
1397	{
1398	/* We don't count NULL pointers. */
1399	if (pv == NULL)
1400	return;
1401	pData->cpvHashDone++;
1402
1403	/* try the hint */
1404	if ( iHint
1405	&& iHint < RT_ELEMENTS(pData->apvHash)
1406	&& pData->apvHash[iHint] == pv)
1407	{
1408	pData->apvHash[iHint] = NULL;
1409	pData->cpvHashUsed--;
1410	return;
1411	}
1412
1413	iHint = ((uintptr_t)pv >> 3) % RT_ELEMENTS(pData->apvHash);
1414	if (RT_UNLIKELY(pData->apvHash[iHint] != pv))
1415	{
1416	/*
1417	* Try up to 120 times then assert.
1418	*/
1419	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1420	int cTries = 120;
1421	for (;;)
1422	{
1423	/* advance to the next hash entry and test it. */
1424	iHint = (iHint + i2) % RT_ELEMENTS(pData->apvHash);
1425	while (RT_UNLIKELY(!iHint))
1426	iHint = (iHint + i2) % RT_ELEMENTS(pData->apvHash);
1427	if (pData->apvHash[iHint] == pv)
1428	break;
1429
1430	/* check if we should give in.*/
1431	if (--cTries > 0)
1432	{
1433	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p cpvHashUsed=%u cpvHashCollisions=%u\n",
1434	pv, pData->cpvHashUsed, pData->cpvHashCollisions));
1435	return;
1436	}
1437	}
1438	}
1439
1440	/* found it */
1441	pData->apvHash[iHint] = NULL;
1442	pData->cpvHashUsed--;
1443	}
1444
1445	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/tcp_subr.c@ 13733

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