tcp_subr.c@ 549

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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	/* patchable/settable parameters for tcp */
49	int tcp_mssdflt = TCP_MSS;
50	int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
51	int tcp_do_rfc1323 = 0; /* Don't do rfc1323 performance enhancements */
52	int tcp_rcvspace; /* You may want to change this */
53	int tcp_sndspace; /* Keep small if you have an error prone link */
54
55	/*
56	* Tcp initialization
57	*/
58	void
59	tcp_init()
60	{
61	tcp_iss = 1; /* wrong */
62	tcb.so_next = tcb.so_prev = &tcb;
63
64	/* tcp_rcvspace = our Window we advertise to the remote */
65	tcp_rcvspace = TCP_RCVSPACE;
66	tcp_sndspace = TCP_SNDSPACE;
67
68	/* Make sure tcp_sndspace is at least 2MSS /
69	if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
70	tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
71	}
72
73	/*
74	* Create template to be used to send tcp packets on a connection.
75	* Call after host entry created, fills
76	* in a skeletal tcp/ip header, minimizing the amount of work
77	* necessary when the connection is used.
78	*/
79	/* struct tcpiphdr * */
80	void
81	tcp_template(tp)
82	struct tcpcb *tp;
83	{
84	struct socket *so = tp->t_socket;
85	register struct tcpiphdr *n = &tp->t_template;
86
87	n->ti_next = n->ti_prev = 0;
88	n->ti_x1 = 0;
89	n->ti_pr = IPPROTO_TCP;
90	n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
91	n->ti_src = so->so_faddr;
92	n->ti_dst = so->so_laddr;
93	n->ti_sport = so->so_fport;
94	n->ti_dport = so->so_lport;
95
96	n->ti_seq = 0;
97	n->ti_ack = 0;
98	n->ti_x2 = 0;
99	n->ti_off = 5;
100	n->ti_flags = 0;
101	n->ti_win = 0;
102	n->ti_sum = 0;
103	n->ti_urp = 0;
104	}
105
106	/*
107	* Send a single message to the TCP at address specified by
108	* the given TCP/IP header. If m == 0, then we make a copy
109	* of the tcpiphdr at ti and send directly to the addressed host.
110	* This is used to force keep alive messages out using the TCP
111	* template for a connection tp->t_template. If flags are given
112	* then we send a message back to the TCP which originated the
113	* segment ti, and discard the mbuf containing it and any other
114	* attached mbufs.
115	*
116	* In any case the ack and sequence number of the transmitted
117	* segment are as specified by the parameters.
118	*/
119	void
120	tcp_respond(tp, ti, m, ack, seq, flags)
121	struct tcpcb *tp;
122	register struct tcpiphdr *ti;
123	register struct mbuf *m;
124	tcp_seq ack, seq;
125	int flags;
126	{
127	register int tlen;
128	int win = 0;
129
130	DEBUG_CALL("tcp_respond");
131	DEBUG_ARG("tp = %lx", (long)tp);
132	DEBUG_ARG("ti = %lx", (long)ti);
133	DEBUG_ARG("m = %lx", (long)m);
134	DEBUG_ARG("ack = %u", ack);
135	DEBUG_ARG("seq = %u", seq);
136	DEBUG_ARG("flags = %x", flags);
137
138	if (tp)
139	win = sbspace(&tp->t_socket->so_rcv);
140	if (m == 0) {
141	if ((m = m_get()) == NULL)
142	return;
143	#ifdef TCP_COMPAT_42
144	tlen = 1;
145	#else
146	tlen = 0;
147	#endif
148	m->m_data += if_maxlinkhdr;
149	mtod(m, struct tcpiphdr ) = *ti;
150	ti = mtod(m, struct tcpiphdr *);
151	flags = TH_ACK;
152	} else {
153	/*
154	* ti points into m so the next line is just making
155	* the mbuf point to ti
156	*/
157	m->m_data = (caddr_t)ti;
158
159	m->m_len = sizeof (struct tcpiphdr);
160	tlen = 0;
161	#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
162	xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
163	xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
164	#undef xchg
165	}
166	ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
167	tlen += sizeof (struct tcpiphdr);
168	m->m_len = tlen;
169
170	ti->ti_next = ti->ti_prev = 0;
171	ti->ti_x1 = 0;
172	ti->ti_seq = htonl(seq);
173	ti->ti_ack = htonl(ack);
174	ti->ti_x2 = 0;
175	ti->ti_off = sizeof (struct tcphdr) >> 2;
176	ti->ti_flags = flags;
177	if (tp)
178	ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
179	else
180	ti->ti_win = htons((u_int16_t)win);
181	ti->ti_urp = 0;
182	ti->ti_sum = 0;
183	ti->ti_sum = cksum(m, tlen);
184	((struct ip *)ti)->ip_len = tlen;
185
186	if(flags & TH_RST)
187	((struct ip *)ti)->ip_ttl = MAXTTL;
188	else
189	((struct ip *)ti)->ip_ttl = ip_defttl;
190
191	(void) ip_output((struct socket *)0, m);
192	}
193
194	/*
195	* Create a new TCP control block, making an
196	* empty reassembly queue and hooking it to the argument
197	* protocol control block.
198	*/
199	struct tcpcb *
200	tcp_newtcpcb(so)
201	struct socket *so;
202	{
203	register struct tcpcb *tp;
204
205	tp = (struct tcpcb )malloc(sizeof(tp));
206	if (tp == NULL)
207	return ((struct tcpcb *)0);
208
209	memset((char *) tp, 0, sizeof(struct tcpcb));
210	tp->seg_next = tp->seg_prev = ptr_to_u32((struct tcpiphdr *)tp);
211	tp->t_maxseg = tcp_mssdflt;
212
213	tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE\|TF_REQ_TSTMP) : 0;
214	tp->t_socket = so;
215
216	/*
217	* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
218	* rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
219	* reasonable initial retransmit time.
220	*/
221	tp->t_srtt = TCPTV_SRTTBASE;
222	tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
223	tp->t_rttmin = TCPTV_MIN;
224
225	TCPT_RANGESET(tp->t_rxtcur,
226	((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
227	TCPTV_MIN, TCPTV_REXMTMAX);
228
229	tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
230	tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
231	tp->t_state = TCPS_CLOSED;
232
233	so->so_tcpcb = tp;
234
235	return (tp);
236	}
237
238	/*
239	* Drop a TCP connection, reporting
240	* the specified error. If connection is synchronized,
241	* then send a RST to peer.
242	*/
243	struct tcpcb tcp_drop(struct tcpcb tp, int err)
244	{
245	/* tcp_drop(tp, errno)
246	register struct tcpcb *tp;
247	int errno;
248	{
249	*/
250
251	DEBUG_CALL("tcp_drop");
252	DEBUG_ARG("tp = %lx", (long)tp);
253	DEBUG_ARG("errno = %d", errno);
254
255	if (TCPS_HAVERCVDSYN(tp->t_state)) {
256	tp->t_state = TCPS_CLOSED;
257	(void) tcp_output(tp);
258	tcpstat.tcps_drops++;
259	} else
260	tcpstat.tcps_conndrops++;
261	/* if (errno == ETIMEDOUT && tp->t_softerror)
262	* errno = tp->t_softerror;
263	*/
264	/* so->so_error = errno; */
265	return (tcp_close(tp));
266	}
267
268	/*
269	* Close a TCP control block:
270	* discard all space held by the tcp
271	* discard internet protocol block
272	* wake up any sleepers
273	*/
274	struct tcpcb *
275	tcp_close(tp)
276	register struct tcpcb *tp;
277	{
278	register struct tcpiphdr *t;
279	struct socket *so = tp->t_socket;
280	register struct mbuf *m;
281
282	DEBUG_CALL("tcp_close");
283	DEBUG_ARG("tp = %lx", (long )tp);
284
285	/* free the reassembly queue, if any */
286	t = u32_to_ptr(tp->seg_next, struct tcpiphdr *);
287	while (t != (struct tcpiphdr *)tp) {
288	t = u32_to_ptr(t->ti_next, struct tcpiphdr *);
289	m = REASS_MBUF_GET(u32_to_ptr(t->ti_prev, struct tcpiphdr *));
290	remque_32(u32_to_ptr(t->ti_prev, struct tcpiphdr *));
291	m_freem(m);
292	}
293	/* It's static */
294	/* if (tp->t_template)
295	* (void) m_free(dtom(tp->t_template));
296	*/
297	/* free(tp, M_PCB); */
298	u32ptr_done(ptr_to_u32(tp), tp);
299	free(tp);
300	so->so_tcpcb = 0;
301	soisfdisconnected(so);
302	/* clobber input socket cache if we're closing the cached connection */
303	if (so == tcp_last_so)
304	tcp_last_so = &tcb;
305	closesocket(so->s);
306	sbfree(&so->so_rcv);
307	sbfree(&so->so_snd);
308	sofree(so);
309	tcpstat.tcps_closed++;
310	return ((struct tcpcb *)0);
311	}
312
313	void
314	tcp_drain()
315	{
316	/* XXX */
317	}
318
319	/*
320	* When a source quench is received, close congestion window
321	* to one segment. We will gradually open it again as we proceed.
322	*/
323
324	#ifdef notdef
325
326	void
327	tcp_quench(i, errno)
328
329	int errno;
330	{
331	struct tcpcb *tp = intotcpcb(inp);
332
333	if (tp)
334	tp->snd_cwnd = tp->t_maxseg;
335	}
336
337	#endif /* notdef */
338
339	/*
340	* TCP protocol interface to socket abstraction.
341	*/
342
343	/*
344	* User issued close, and wish to trail through shutdown states:
345	* if never received SYN, just forget it. If got a SYN from peer,
346	* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
347	* If already got a FIN from peer, then almost done; go to LAST_ACK
348	* state. In all other cases, have already sent FIN to peer (e.g.
349	* after PRU_SHUTDOWN), and just have to play tedious game waiting
350	* for peer to send FIN or not respond to keep-alives, etc.
351	* We can let the user exit from the close as soon as the FIN is acked.
352	*/
353	void
354	tcp_sockclosed(tp)
355	struct tcpcb *tp;
356	{
357
358	DEBUG_CALL("tcp_sockclosed");
359	DEBUG_ARG("tp = %lx", (long)tp);
360
361	switch (tp->t_state) {
362
363	case TCPS_CLOSED:
364	case TCPS_LISTEN:
365	case TCPS_SYN_SENT:
366	tp->t_state = TCPS_CLOSED;
367	tp = tcp_close(tp);
368	break;
369
370	case TCPS_SYN_RECEIVED:
371	case TCPS_ESTABLISHED:
372	tp->t_state = TCPS_FIN_WAIT_1;
373	break;
374
375	case TCPS_CLOSE_WAIT:
376	tp->t_state = TCPS_LAST_ACK;
377	break;
378	}
379	/* soisfdisconnecting(tp->t_socket); */
380	if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
381	soisfdisconnected(tp->t_socket);
382	if (tp)
383	tcp_output(tp);
384	}
385
386	/*
387	* Connect to a host on the Internet
388	* Called by tcp_input
389	* Only do a connect, the tcp fields will be set in tcp_input
390	* return 0 if there's a result of the connect,
391	* else return -1 means we're still connecting
392	* The return value is almost always -1 since the socket is
393	* nonblocking. Connect returns after the SYN is sent, and does
394	* not wait for ACK+SYN.
395	*/
396	int tcp_fconnect(so)
397	struct socket *so;
398	{
399	int ret=0;
400
401	DEBUG_CALL("tcp_fconnect");
402	DEBUG_ARG("so = %lx", (long )so);
403
404	if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
405	int opt, s=so->s;
406	struct sockaddr_in addr;
407
408	fd_nonblock(s);
409	opt = 1;
410	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
411	opt = 1;
412	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
413
414	addr.sin_family = AF_INET;
415	if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
416	/* It's an alias */
417	switch(ntohl(so->so_faddr.s_addr) & 0xff) {
418	case CTL_DNS:
419	addr.sin_addr = dns_addr;
420	break;
421	case CTL_ALIAS:
422	default:
423	addr.sin_addr = loopback_addr;
424	break;
425	}
426	} else
427	addr.sin_addr = so->so_faddr;
428	addr.sin_port = so->so_fport;
429
430	DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
431	"addr.sin_addr.s_addr=%.16s\n",
432	ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
433	/* We don't care what port we get */
434	ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
435
436	/*
437	* If it's not in progress, it failed, so we just return 0,
438	* without clearing SS_NOFDREF
439	*/
440	soisfconnecting(so);
441	}
442
443	return(ret);
444	}
445
446	/*
447	* Accept the socket and connect to the local-host
448	*
449	* We have a problem. The correct thing to do would be
450	* to first connect to the local-host, and only if the
451	* connection is accepted, then do an accept() here.
452	* But, a) we need to know who's trying to connect
453	* to the socket to be able to SYN the local-host, and
454	* b) we are already connected to the foreign host by
455	* the time it gets to accept(), so... We simply accept
456	* here and SYN the local-host.
457	*/
458	void
459	tcp_connect(inso)
460	struct socket *inso;
461	{
462	struct socket *so;
463	struct sockaddr_in addr;
464	#ifndef VBOX
465	int addrlen = sizeof(struct sockaddr_in);
466	#else /* VBOX */
467	socklen_t addrlen = sizeof(struct sockaddr_in);
468	#endif /* VBOX */
469	struct tcpcb *tp;
470	int s, opt;
471
472	DEBUG_CALL("tcp_connect");
473	DEBUG_ARG("inso = %lx", (long)inso);
474
475	/*
476	* If it's an SS_ACCEPTONCE socket, no need to socreate()
477	* another socket, just use the accept() socket.
478	*/
479	if (inso->so_state & SS_FACCEPTONCE) {
480	/* FACCEPTONCE already have a tcpcb */
481	so = inso;
482	} else {
483	if ((so = socreate()) == NULL) {
484	/* If it failed, get rid of the pending connection */
485	closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
486	return;
487	}
488	if (tcp_attach(so) < 0) {
489	free(so); /* NOT sofree */
490	return;
491	}
492	so->so_laddr = inso->so_laddr;
493	so->so_lport = inso->so_lport;
494	}
495
496	(void) tcp_mss(sototcpcb(so), 0);
497
498	if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
499	tcp_close(sototcpcb(so)); /* This will sofree() as well */
500	return;
501	}
502	fd_nonblock(s);
503	opt = 1;
504	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
505	opt = 1;
506	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
507	opt = 1;
508	setsockopt(s,IPPROTO_TCP,TCP_NODELAY,(char *)&opt,sizeof(int));
509
510	so->so_fport = addr.sin_port;
511	so->so_faddr = addr.sin_addr;
512	/* Translate connections from localhost to the real hostname */
513	if (so->so_faddr.s_addr == 0 \|\| so->so_faddr.s_addr == loopback_addr.s_addr)
514	so->so_faddr = alias_addr;
515
516	/* Close the accept() socket, set right state */
517	if (inso->so_state & SS_FACCEPTONCE) {
518	closesocket(so->s); /* If we only accept once, close the accept() socket */
519	so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
520	/* if it's not FACCEPTONCE, it's already NOFDREF */
521	}
522	so->s = s;
523
524	so->so_iptos = tcp_tos(so);
525	tp = sototcpcb(so);
526
527	tcp_template(tp);
528
529	/* Compute window scaling to request. */
530	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
531	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
532	* tp->request_r_scale++;
533	*/
534
535	/* soisconnecting(so); / / NOFDREF used instead */
536	tcpstat.tcps_connattempt++;
537
538	tp->t_state = TCPS_SYN_SENT;
539	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
540	tp->iss = tcp_iss;
541	tcp_iss += TCP_ISSINCR/2;
542	tcp_sendseqinit(tp);
543	tcp_output(tp);
544	}
545
546	/*
547	* Attach a TCPCB to a socket.
548	*/
549	int
550	tcp_attach(so)
551	struct socket *so;
552	{
553	if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
554	return -1;
555
556	insque(so, &tcb);
557
558	return 0;
559	}
560
561	/*
562	* Set the socket's type of service field
563	*/
564	struct tos_t tcptos[] = {
565	{0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
566	{21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
567	{0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
568	{0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
569	{0, 513, IPTOS_LOWDELAY, EMU_RLOGIN\|EMU_NOCONNECT}, /* rlogin */
570	{0, 514, IPTOS_LOWDELAY, EMU_RSH\|EMU_NOCONNECT}, /* shell */
571	{0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
572	{0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
573	{0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
574	{0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
575	{0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
576	{0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
577	{0, 0, 0, 0}
578	};
579
580	struct emu_t *tcpemu = 0;
581
582	/*
583	* Return TOS according to the above table
584	*/
585	u_int8_t
586	tcp_tos(so)
587	struct socket *so;
588	{
589	int i = 0;
590	struct emu_t *emup;
591
592	while(tcptos[i].tos) {
593	if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) \|\|
594	(tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
595	so->so_emu = tcptos[i].emu;
596	return tcptos[i].tos;
597	}
598	i++;
599	}
600
601	/* Nope, lets see if there's a user-added one */
602	for (emup = tcpemu; emup; emup = emup->next) {
603	if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) \|\|
604	(emup->lport && (ntohs(so->so_lport) == emup->lport))) {
605	so->so_emu = emup->emu;
606	return emup->tos;
607	}
608	}
609
610	return 0;
611	}
612
613	int do_echo = -1;
614
615	/*
616	* Emulate programs that try and connect to us
617	* This includes ftp (the data connection is
618	* initiated by the server) and IRC (DCC CHAT and
619	* DCC SEND) for now
620	*
621	* NOTE: It's possible to crash SLiRP by sending it
622	* unstandard strings to emulate... if this is a problem,
623	* more checks are needed here
624	*
625	* XXX Assumes the whole command came in one packet
626	*
627	* XXX Some ftp clients will have their TOS set to
628	* LOWDELAY and so Nagel will kick in. Because of this,
629	* we'll get the first letter, followed by the rest, so
630	* we simply scan for ORT instead of PORT...
631	* DCC doesn't have this problem because there's other stuff
632	* in the packet before the DCC command.
633	*
634	* Return 1 if the mbuf m is still valid and should be
635	* sbappend()ed
636	*
637	* NOTE: if you return 0 you MUST m_free() the mbuf!
638	*/
639	int
640	tcp_emu(so, m)
641	struct socket *so;
642	struct mbuf *m;
643	{
644	u_int n1, n2, n3, n4, n5, n6;
645	char buff[256];
646	u_int32_t laddr;
647	u_int lport;
648	char *bptr;
649
650	DEBUG_CALL("tcp_emu");
651	DEBUG_ARG("so = %lx", (long)so);
652	DEBUG_ARG("m = %lx", (long)m);
653
654	switch(so->so_emu) {
655	int x, i;
656
657	case EMU_IDENT:
658	/*
659	* Identification protocol as per rfc-1413
660	*/
661
662	{
663	struct socket *tmpso;
664	struct sockaddr_in addr;
665	#ifndef VBOX
666	int addrlen = sizeof(struct sockaddr_in);
667	#else /* VBOX */
668	socklen_t addrlen = sizeof(struct sockaddr_in);
669	#endif /* VBOX */
670	struct sbuf *so_rcv = &so->so_rcv;
671
672	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
673	so_rcv->sb_wptr += m->m_len;
674	so_rcv->sb_rptr += m->m_len;
675	m->m_data[m->m_len] = 0; /* NULL terminate */
676	if (strchr(m->m_data, '\r') \|\| strchr(m->m_data, '\n')) {
677	#ifdef VBOX
678	if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
679	#else
680	if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) {
681	#endif
682	HTONS(n1);
683	HTONS(n2);
684	/* n2 is the one on our host */
685	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
686	if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
687	tmpso->so_lport == n2 &&
688	tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
689	tmpso->so_fport == n1) {
690	if (getsockname(tmpso->s,
691	(struct sockaddr *)&addr, &addrlen) == 0)
692	n2 = ntohs(addr.sin_port);
693	break;
694	}
695	}
696	}
697	so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
698	so_rcv->sb_rptr = so_rcv->sb_data;
699	so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
700	}
701	m_free(m);
702	return 0;
703	}
704
705	#if 0
706	case EMU_RLOGIN:
707	/*
708	* Rlogin emulation
709	* First we accumulate all the initial option negotiation,
710	* then fork_exec() rlogin according to the options
711	*/
712	{
713	int i, i2, n;
714	char *ptr;
715	char args[100];
716	char term[100];
717	struct sbuf *so_snd = &so->so_snd;
718	struct sbuf *so_rcv = &so->so_rcv;
719
720	/* First check if they have a priveladged port, or too much data has arrived */
721	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
722	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
723	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
724	so_snd->sb_wptr += 18;
725	so_snd->sb_cc += 18;
726	tcp_sockclosed(sototcpcb(so));
727	m_free(m);
728	return 0;
729	}
730
731	/* Append the current data */
732	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
733	so_rcv->sb_wptr += m->m_len;
734	so_rcv->sb_rptr += m->m_len;
735	m_free(m);
736
737	/*
738	* Check if we have all the initial options,
739	* and build argument list to rlogin while we're here
740	*/
741	n = 0;
742	ptr = so_rcv->sb_data;
743	args[0] = 0;
744	term[0] = 0;
745	while (ptr < so_rcv->sb_wptr) {
746	if (*ptr++ == 0) {
747	n++;
748	if (n == 2) {
749	sprintf(args, "rlogin -l %s %s",
750	ptr, inet_ntoa(so->so_faddr));
751	} else if (n == 3) {
752	i2 = so_rcv->sb_wptr - ptr;
753	for (i = 0; i < i2; i++) {
754	if (ptr[i] == '/') {
755	ptr[i] = 0;
756	#ifdef HAVE_SETENV
757	sprintf(term, "%s", ptr);
758	#else
759	sprintf(term, "TERM=%s", ptr);
760	#endif
761	ptr[i] = '/';
762	break;
763	}
764	}
765	}
766	}
767	}
768
769	if (n != 4)
770	return 0;
771
772	/* We have it, set our term variable and fork_exec() */
773	#ifdef HAVE_SETENV
774	setenv("TERM", term, 1);
775	#else
776	putenv(term);
777	#endif
778	fork_exec(so, args, 2);
779	term[0] = 0;
780	so->so_emu = 0;
781
782	/* And finally, send the client a 0 character */
783	so_snd->sb_wptr[0] = 0;
784	so_snd->sb_wptr++;
785	so_snd->sb_cc++;
786
787	return 0;
788	}
789
790	case EMU_RSH:
791	/*
792	* rsh emulation
793	* First we accumulate all the initial option negotiation,
794	* then rsh_exec() rsh according to the options
795	*/
796	{
797	int n;
798	char *ptr;
799	char *user;
800	char *args;
801	struct sbuf *so_snd = &so->so_snd;
802	struct sbuf *so_rcv = &so->so_rcv;
803
804	/* First check if they have a priveladged port, or too much data has arrived */
805	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
806	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
807	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
808	so_snd->sb_wptr += 18;
809	so_snd->sb_cc += 18;
810	tcp_sockclosed(sototcpcb(so));
811	m_free(m);
812	return 0;
813	}
814
815	/* Append the current data */
816	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
817	so_rcv->sb_wptr += m->m_len;
818	so_rcv->sb_rptr += m->m_len;
819	m_free(m);
820
821	/*
822	* Check if we have all the initial options,
823	* and build argument list to rlogin while we're here
824	*/
825	n = 0;
826	ptr = so_rcv->sb_data;
827	user="";
828	args="";
829	if (so->extra==NULL) {
830	struct socket *ns;
831	struct tcpcb* tp;
832	int port=atoi(ptr);
833	if (port <= 0) return 0;
834	if (port > 1023 \|\| port < 512) {
835	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
836	so_snd->sb_wptr += 18;
837	so_snd->sb_cc += 18;
838	tcp_sockclosed(sototcpcb(so));
839	return 0;
840	}
841	if ((ns=socreate()) == NULL)
842	return 0;
843	if (tcp_attach(ns)<0) {
844	free(ns);
845	return 0;
846	}
847
848	ns->so_laddr=so->so_laddr;
849	ns->so_lport=htons(port);
850
851	(void) tcp_mss(sototcpcb(ns), 0);
852
853	ns->so_faddr=so->so_faddr;
854	ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
855
856	if (ns->so_faddr.s_addr == 0 \|\|
857	ns->so_faddr.s_addr == loopback_addr.s_addr)
858	ns->so_faddr = alias_addr;
859
860	ns->so_iptos = tcp_tos(ns);
861	tp = sototcpcb(ns);
862
863	tcp_template(tp);
864
865	/* Compute window scaling to request. */
866	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
867	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
868	* tp->request_r_scale++;
869	*/
870
871	/soisfconnecting(ns);/
872
873	tcpstat.tcps_connattempt++;
874
875	tp->t_state = TCPS_SYN_SENT;
876	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
877	tp->iss = tcp_iss;
878	tcp_iss += TCP_ISSINCR/2;
879	tcp_sendseqinit(tp);
880	tcp_output(tp);
881	so->extra=ns;
882	}
883	while (ptr < so_rcv->sb_wptr) {
884	if (*ptr++ == 0) {
885	n++;
886	if (n == 2) {
887	user=ptr;
888	} else if (n == 3) {
889	args=ptr;
890	}
891	}
892	}
893
894	if (n != 4)
895	return 0;
896
897	rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
898	so->so_emu = 0;
899	so->extra=NULL;
900
901	/* And finally, send the client a 0 character */
902	so_snd->sb_wptr[0] = 0;
903	so_snd->sb_wptr++;
904	so_snd->sb_cc++;
905
906	return 0;
907	}
908
909	case EMU_CTL:
910	{
911	int num;
912	struct sbuf *so_snd = &so->so_snd;
913	struct sbuf *so_rcv = &so->so_rcv;
914
915	/*
916	* If there is binary data here, we save it in so->so_m
917	*/
918	if (!so->so_m) {
919	int rxlen;
920	char *rxdata;
921	rxdata=mtod(m, char *);
922	for (rxlen=m->m_len; rxlen; rxlen--) {
923	if (*rxdata++ & 0x80) {
924	so->so_m = m;
925	return 0;
926	}
927	}
928	} /* if(so->so_m==NULL) */
929
930	/*
931	* Append the line
932	*/
933	sbappendsb(so_rcv, m);
934
935	/* To avoid going over the edge of the buffer, we reset it */
936	if (so_snd->sb_cc == 0)
937	so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
938
939	/*
940	* A bit of a hack:
941	* If the first packet we get here is 1 byte long, then it
942	* was done in telnet character mode, therefore we must echo
943	* the characters as they come. Otherwise, we echo nothing,
944	* because in linemode, the line is already echoed
945	* XXX two or more control connections won't work
946	*/
947	if (do_echo == -1) {
948	if (m->m_len == 1) do_echo = 1;
949	else do_echo = 0;
950	}
951	if (do_echo) {
952	sbappendsb(so_snd, m);
953	m_free(m);
954	tcp_output(sototcpcb(so)); /* XXX */
955	} else
956	m_free(m);
957
958	num = 0;
959	while (num < so->so_rcv.sb_cc) {
960	if (*(so->so_rcv.sb_rptr + num) == '\n' \|\|
961	*(so->so_rcv.sb_rptr + num) == '\r') {
962	int n;
963
964	*(so_rcv->sb_rptr + num) = 0;
965	if (ctl_password && !ctl_password_ok) {
966	/* Need a password */
967	if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
968	if (strcmp(buff, ctl_password) == 0) {
969	ctl_password_ok = 1;
970	n = sprintf(so_snd->sb_wptr,
971	"Password OK.\r\n");
972	goto do_prompt;
973	}
974	}
975	n = sprintf(so_snd->sb_wptr,
976	"Error: Password required, log on with \"pass PASSWORD\"\r\n");
977	goto do_prompt;
978	}
979	cfg_quitting = 0;
980	n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
981	if (!cfg_quitting) {
982	/* Register the printed data */
983	do_prompt:
984	so_snd->sb_cc += n;
985	so_snd->sb_wptr += n;
986	/* Add prompt */
987	n = sprintf(so_snd->sb_wptr, "Slirp> ");
988	so_snd->sb_cc += n;
989	so_snd->sb_wptr += n;
990	}
991	/* Drop so_rcv data */
992	so_rcv->sb_cc = 0;
993	so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
994	tcp_output(sototcpcb(so)); /* Send the reply */
995	}
996	num++;
997	}
998	return 0;
999	}
1000	#endif
1001	case EMU_FTP: /* ftp */
1002	(m->m_data+m->m_len) = 0; / NULL terminate for strstr */
1003	if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
1004	/*
1005	* Need to emulate the PORT command
1006	*/
1007	#ifdef VBOX
1008	x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
1009	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1010	#else
1011	x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
1012	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1013	#endif
1014	if (x < 6)
1015	return 1;
1016
1017	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1018	lport = htons((n5 << 8) \| (n6));
1019
1020	if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1021	return 1;
1022
1023	n6 = ntohs(so->so_fport);
1024
1025	n5 = (n6 >> 8) & 0xff;
1026	n6 &= 0xff;
1027
1028	laddr = ntohl(so->so_faddr.s_addr);
1029
1030	n1 = ((laddr >> 24) & 0xff);
1031	n2 = ((laddr >> 16) & 0xff);
1032	n3 = ((laddr >> 8) & 0xff);
1033	n4 = (laddr & 0xff);
1034
1035	m->m_len = bptr - m->m_data; /* Adjust length */
1036	m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
1037	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1038	return 1;
1039	} else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
1040	/*
1041	* Need to emulate the PASV response
1042	*/
1043	#ifdef VBOX
1044	x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
1045	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1046	#else
1047	x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
1048	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1049	#endif
1050	if (x < 6)
1051	return 1;
1052
1053	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1054	lport = htons((n5 << 8) \| (n6));
1055
1056	if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1057	return 1;
1058
1059	n6 = ntohs(so->so_fport);
1060
1061	n5 = (n6 >> 8) & 0xff;
1062	n6 &= 0xff;
1063
1064	laddr = ntohl(so->so_faddr.s_addr);
1065
1066	n1 = ((laddr >> 24) & 0xff);
1067	n2 = ((laddr >> 16) & 0xff);
1068	n3 = ((laddr >> 8) & 0xff);
1069	n4 = (laddr & 0xff);
1070
1071	m->m_len = bptr - m->m_data; /* Adjust length */
1072	m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1073	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1074
1075	return 1;
1076	}
1077
1078	return 1;
1079
1080	case EMU_KSH:
1081	/*
1082	* The kshell (Kerberos rsh) and shell services both pass
1083	* a local port port number to carry signals to the server
1084	* and stderr to the client. It is passed at the beginning
1085	* of the connection as a NUL-terminated decimal ASCII string.
1086	*/
1087	so->so_emu = 0;
1088	for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1089	if (m->m_data[i] < '0' \|\| m->m_data[i] > '9')
1090	return 1; /* invalid number */
1091	lport *= 10;
1092	lport += m->m_data[i] - '0';
1093	}
1094	if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1095	(so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1096	m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
1097	return 1;
1098
1099	case EMU_IRC:
1100	/*
1101	* Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1102	*/
1103	(m->m_data+m->m_len) = 0; / NULL terminate the string for strstr */
1104	if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1105	return 1;
1106
1107	/* The %256s is for the broken mIRC */
1108	if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1109	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1110	return 1;
1111
1112	m->m_len = bptr - m->m_data; /* Adjust length */
1113	m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
1114	(unsigned long)ntohl(so->so_faddr.s_addr),
1115	ntohs(so->so_fport), 1);
1116	} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1117	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1118	return 1;
1119
1120	m->m_len = bptr - m->m_data; /* Adjust length */
1121	m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
1122	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1123	ntohs(so->so_fport), n1, 1);
1124	} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1125	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1126	return 1;
1127
1128	m->m_len = bptr - m->m_data; /* Adjust length */
1129	m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
1130	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1131	ntohs(so->so_fport), n1, 1);
1132	}
1133	return 1;
1134
1135	case EMU_REALAUDIO:
1136	/*
1137	* RealAudio emulation - JP. We must try to parse the incoming
1138	* data and try to find the two characters that contain the
1139	* port number. Then we redirect an udp port and replace the
1140	* number with the real port we got.
1141	*
1142	* The 1.0 beta versions of the player are not supported
1143	* any more.
1144	*
1145	* A typical packet for player version 1.0 (release version):
1146	*
1147	* 0000:50 4E 41 00 05
1148	* 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....×..gælÜc..P
1149	* 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1150	* 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1151	* 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1152	*
1153	* Now the port number 0x1BD7 is found at offset 0x04 of the
1154	* Now the port number 0x1BD7 is found at offset 0x04 of the
1155	* second packet. This time we received five bytes first and
1156	* then the rest. You never know how many bytes you get.
1157	*
1158	* A typical packet for player version 2.0 (beta):
1159	*
1160	* 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........Á.
1161	* 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..Win2.0.0
1162	* 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1163	* 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1164	* 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1165	*
1166	* Port number 0x1BC1 is found at offset 0x0d.
1167	*
1168	* This is just a horrible switch statement. Variable ra tells
1169	* us where we're going.
1170	*/
1171
1172	bptr = m->m_data;
1173	while (bptr < m->m_data + m->m_len) {
1174	u_short p;
1175	static int ra = 0;
1176	char ra_tbl[4];
1177
1178	ra_tbl[0] = 0x50;
1179	ra_tbl[1] = 0x4e;
1180	ra_tbl[2] = 0x41;
1181	ra_tbl[3] = 0;
1182
1183	switch (ra) {
1184	case 0:
1185	case 2:
1186	case 3:
1187	if (*bptr++ != ra_tbl[ra]) {
1188	ra = 0;
1189	continue;
1190	}
1191	break;
1192
1193	case 1:
1194	/*
1195	* We may get 0x50 several times, ignore them
1196	*/
1197	if (*bptr == 0x50) {
1198	ra = 1;
1199	bptr++;
1200	continue;
1201	} else if (*bptr++ != ra_tbl[ra]) {
1202	ra = 0;
1203	continue;
1204	}
1205	break;
1206
1207	case 4:
1208	/*
1209	* skip version number
1210	*/
1211	bptr++;
1212	break;
1213
1214	case 5:
1215	/*
1216	* The difference between versions 1.0 and
1217	* 2.0 is here. For future versions of
1218	* the player this may need to be modified.
1219	*/
1220	if (*(bptr + 1) == 0x02)
1221	bptr += 8;
1222	else
1223	bptr += 4;
1224	break;
1225
1226	case 6:
1227	/* This is the field containing the port
1228	* number that RA-player is listening to.
1229	*/
1230	lport = (((u_char*)bptr)[0] << 8)
1231	+ ((u_char *)bptr)[1];
1232	if (lport < 6970)
1233	lport += 256; /* don't know why */
1234	if (lport < 6970 \|\| lport > 7170)
1235	return 1; /* failed */
1236
1237	/* try to get udp port between 6970 - 7170 */
1238	for (p = 6970; p < 7071; p++) {
1239	if (udp_listen( htons(p),
1240	so->so_laddr.s_addr,
1241	htons(lport),
1242	SS_FACCEPTONCE)) {
1243	break;
1244	}
1245	}
1246	if (p == 7071)
1247	p = 0;
1248	(u_char )bptr++ = (p >> 8) & 0xff;
1249	(u_char )bptr++ = p & 0xff;
1250	ra = 0;
1251	return 1; /* port redirected, we're done */
1252	break;
1253
1254	default:
1255	ra = 0;
1256	}
1257	ra++;
1258	}
1259	return 1;
1260
1261	default:
1262	/* Ooops, not emulated, won't call tcp_emu again */
1263	so->so_emu = 0;
1264	return 1;
1265	}
1266	}
1267
1268	/*
1269	* Do misc. config of SLiRP while its running.
1270	* Return 0 if this connections is to be closed, 1 otherwise,
1271	* return 2 if this is a command-line connection
1272	*/
1273	int
1274	tcp_ctl(so)
1275	struct socket *so;
1276	{
1277	struct sbuf *sb = &so->so_snd;
1278	int command;
1279	struct ex_list *ex_ptr;
1280	int do_pty;
1281	/* struct socket tmpso; /
1282
1283	DEBUG_CALL("tcp_ctl");
1284	DEBUG_ARG("so = %lx", (long )so);
1285
1286	#if 0
1287	/*
1288	* Check if they're authorised
1289	*/
1290	if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 \|\| (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1291	sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1292	sb->sb_wptr += sb->sb_cc;
1293	return 0;
1294	}
1295	#endif
1296	command = (ntohl(so->so_faddr.s_addr) & 0xff);
1297
1298	switch(command) {
1299	default: /* Check for exec's */
1300
1301	/*
1302	* Check if it's pty_exec
1303	*/
1304	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1305	if (ex_ptr->ex_fport == so->so_fport &&
1306	command == ex_ptr->ex_addr) {
1307	do_pty = ex_ptr->ex_pty;
1308	goto do_exec;
1309	}
1310	}
1311
1312	/*
1313	* Nothing bound..
1314	*/
1315	/* tcp_fconnect(so); */
1316
1317	/* FALLTHROUGH */
1318	case CTL_ALIAS:
1319	sb->sb_cc = sprintf(sb->sb_wptr,
1320	"Error: No application configured.\r\n");
1321	sb->sb_wptr += sb->sb_cc;
1322	return(0);
1323
1324	do_exec:
1325	DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1326	return(fork_exec(so, ex_ptr->ex_exec, do_pty));
1327
1328	#if 0
1329	case CTL_CMD:
1330	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1331	if (tmpso->so_emu == EMU_CTL &&
1332	!(tmpso->so_tcpcb?
1333	(tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT\|TCPS_LAST_ACK))
1334	:0)) {
1335	/* Ooops, control connection already active */
1336	sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1337	sb->sb_wptr += sb->sb_cc;
1338	return 0;
1339	}
1340	}
1341	so->so_emu = EMU_CTL;
1342	ctl_password_ok = 0;
1343	sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1344	sb->sb_wptr += sb->sb_cc;
1345	do_echo=-1;
1346	return(2);
1347	#endif
1348	}
1349	}
1350
1351	#if defined(VBOX) && SIZEOF_CHAR_P != 4
1352	/** Hash table used for translating pointers to unique uint32_t entries.
1353	* The 0 entry is reserved for NULL pointers. */
1354	void *g_apvHash[16384];
1355	/** The number of currently used pointer hash entries. */
1356	uint32_t g_cpvHashUsed = 1;
1357	/** The number of insert collisions. */
1358	uint32_t g_cpvHashCollisions = 0;
1359	/** The number of hash inserts. */
1360	uint64_t g_cpvHashInserts = 0;
1361	/** The number of done calls. */
1362	uint64_t g_cpvHashDone = 0;
1363
1364	/**
1365	* Slow pointer hashing that deals with automatic inserting and collisions.
1366	*/
1367	uint32_t VBoxU32PtrHashSlow(void *pv)
1368	{
1369	uint32_t i;
1370	if (pv == NULL)
1371	i = 0;
1372	else
1373	{
1374	const uint32_t i1 = ((uintptr_t)pv >> 3) % RT_ELEMENTS(g_apvHash);
1375	if (g_apvHash[i1] == pv)
1376	i = i1;
1377	else
1378	{
1379	/*
1380	* Try up to 10 times then assume it's an insertion.
1381	* If we didn't find a free entry by then, try another 100 times.
1382	* If that fails, give up.
1383	*/
1384	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1385	uint32_t i1stFree = g_apvHash[i1] ? 0 : i1;
1386	int cTries = 10;
1387	int cTries2 = 100;
1388
1389	i = i1;
1390	for (;;)
1391	{
1392	/* check if we should give in.*/
1393	if (--cTries > 0)
1394	{
1395	if (i1stFree != 0)
1396	{
1397	i = i1stFree;
1398	g_apvHash[i] = pv;
1399	g_cpvHashUsed++;
1400	if (i != i1)
1401	g_cpvHashCollisions++;
1402	g_cpvHashInserts++;
1403	break;
1404	}
1405	if (!cTries2)
1406	{
1407	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p g_cpvHashUsed=%d g_cpvHashCollisions=%u\n",
1408	pv, g_cpvHashUsed, g_cpvHashCollisions));
1409	i = 0;
1410	break;
1411	}
1412	cTries = cTries2;
1413	cTries2 = 0;
1414	}
1415
1416	/* advance to the next hash entry and test it. */
1417	i = (i + i2) % RT_ELEMENTS(g_apvHash);
1418	while (RT_UNLIKELY(!i))
1419	i = (i + i2) % RT_ELEMENTS(g_apvHash);
1420	if (g_apvHash[i] == pv)
1421	break;
1422	if (RT_UNLIKELY(!i1stFree && !g_apvHash[i]))
1423	i1stFree = i;
1424	}
1425	}
1426	}
1427	return i;
1428	}
1429
1430
1431	/**
1432	* Removes the pointer from the hash table.
1433	*/
1434	void VBoxU32PtrDone(void *pv, uint32_t iHint)
1435	{
1436	/* We don't count NULL pointers. */
1437	if (pv == NULL)
1438	return;
1439	g_cpvHashDone++;
1440
1441	/* try the hint */
1442	if ( iHint
1443	&& iHint < RT_ELEMENTS(g_apvHash)
1444	&& g_apvHash[iHint] == pv)
1445	{
1446	g_apvHash[iHint] = NULL;
1447	g_cpvHashUsed--;
1448	return;
1449	}
1450
1451	iHint = ((uintptr_t)pv >> 3) % RT_ELEMENTS(g_apvHash);
1452	if (RT_UNLIKELY(g_apvHash[iHint] != pv))
1453	{
1454	/*
1455	* Try up to 120 times then assert.
1456	*/
1457	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1458	int cTries = 120;
1459	for (;;)
1460	{
1461	/* advance to the next hash entry and test it. */
1462	iHint = (iHint + i2) % RT_ELEMENTS(g_apvHash);
1463	while (RT_UNLIKELY(!iHint))
1464	iHint = (iHint + i2) % RT_ELEMENTS(g_apvHash);
1465	if (g_apvHash[iHint] == pv)
1466	break;
1467
1468	/* check if we should give in.*/
1469	if (--cTries > 0)
1470	{
1471	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p g_cpvHashUsed=%u g_cpvHashCollisions=%u\n",
1472	pv, g_cpvHashUsed, g_cpvHashCollisions));
1473	return;
1474	}
1475	}
1476	}
1477
1478	/* found it */
1479	g_apvHash[iHint] = NULL;
1480	g_cpvHashUsed--;
1481	}
1482
1483	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/tcp_subr.c@ 549

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