tcp_subr.c@ 207

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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 = (tcpiphdrp_32)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 = (struct tcpiphdr *) tp->seg_next;
287	while (t != (struct tcpiphdr *)tp) {
288	t = (struct tcpiphdr *)t->ti_next;
289	m = (struct mbuf ) REASS_MBUF((struct tcpiphdr )t->ti_prev);
290	remque_32((struct tcpiphdr *) t->ti_prev);
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	free(tp);
299	so->so_tcpcb = 0;
300	soisfdisconnected(so);
301	/* clobber input socket cache if we're closing the cached connection */
302	if (so == tcp_last_so)
303	tcp_last_so = &tcb;
304	closesocket(so->s);
305	sbfree(&so->so_rcv);
306	sbfree(&so->so_snd);
307	sofree(so);
308	tcpstat.tcps_closed++;
309	return ((struct tcpcb *)0);
310	}
311
312	void
313	tcp_drain()
314	{
315	/* XXX */
316	}
317
318	/*
319	* When a source quench is received, close congestion window
320	* to one segment. We will gradually open it again as we proceed.
321	*/
322
323	#ifdef notdef
324
325	void
326	tcp_quench(i, errno)
327
328	int errno;
329	{
330	struct tcpcb *tp = intotcpcb(inp);
331
332	if (tp)
333	tp->snd_cwnd = tp->t_maxseg;
334	}
335
336	#endif /* notdef */
337
338	/*
339	* TCP protocol interface to socket abstraction.
340	*/
341
342	/*
343	* User issued close, and wish to trail through shutdown states:
344	* if never received SYN, just forget it. If got a SYN from peer,
345	* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
346	* If already got a FIN from peer, then almost done; go to LAST_ACK
347	* state. In all other cases, have already sent FIN to peer (e.g.
348	* after PRU_SHUTDOWN), and just have to play tedious game waiting
349	* for peer to send FIN or not respond to keep-alives, etc.
350	* We can let the user exit from the close as soon as the FIN is acked.
351	*/
352	void
353	tcp_sockclosed(tp)
354	struct tcpcb *tp;
355	{
356
357	DEBUG_CALL("tcp_sockclosed");
358	DEBUG_ARG("tp = %lx", (long)tp);
359
360	switch (tp->t_state) {
361
362	case TCPS_CLOSED:
363	case TCPS_LISTEN:
364	case TCPS_SYN_SENT:
365	tp->t_state = TCPS_CLOSED;
366	tp = tcp_close(tp);
367	break;
368
369	case TCPS_SYN_RECEIVED:
370	case TCPS_ESTABLISHED:
371	tp->t_state = TCPS_FIN_WAIT_1;
372	break;
373
374	case TCPS_CLOSE_WAIT:
375	tp->t_state = TCPS_LAST_ACK;
376	break;
377	}
378	/* soisfdisconnecting(tp->t_socket); */
379	if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
380	soisfdisconnected(tp->t_socket);
381	if (tp)
382	tcp_output(tp);
383	}
384
385	/*
386	* Connect to a host on the Internet
387	* Called by tcp_input
388	* Only do a connect, the tcp fields will be set in tcp_input
389	* return 0 if there's a result of the connect,
390	* else return -1 means we're still connecting
391	* The return value is almost always -1 since the socket is
392	* nonblocking. Connect returns after the SYN is sent, and does
393	* not wait for ACK+SYN.
394	*/
395	int tcp_fconnect(so)
396	struct socket *so;
397	{
398	int ret=0;
399
400	DEBUG_CALL("tcp_fconnect");
401	DEBUG_ARG("so = %lx", (long )so);
402
403	if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
404	int opt, s=so->s;
405	struct sockaddr_in addr;
406
407	fd_nonblock(s);
408	opt = 1;
409	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
410	opt = 1;
411	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
412
413	addr.sin_family = AF_INET;
414	if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
415	/* It's an alias */
416	switch(ntohl(so->so_faddr.s_addr) & 0xff) {
417	case CTL_DNS:
418	addr.sin_addr = dns_addr;
419	break;
420	case CTL_ALIAS:
421	default:
422	addr.sin_addr = loopback_addr;
423	break;
424	}
425	} else
426	addr.sin_addr = so->so_faddr;
427	addr.sin_port = so->so_fport;
428
429	DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
430	"addr.sin_addr.s_addr=%.16s\n",
431	ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
432	/* We don't care what port we get */
433	ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
434
435	/*
436	* If it's not in progress, it failed, so we just return 0,
437	* without clearing SS_NOFDREF
438	*/
439	soisfconnecting(so);
440	}
441
442	return(ret);
443	}
444
445	/*
446	* Accept the socket and connect to the local-host
447	*
448	* We have a problem. The correct thing to do would be
449	* to first connect to the local-host, and only if the
450	* connection is accepted, then do an accept() here.
451	* But, a) we need to know who's trying to connect
452	* to the socket to be able to SYN the local-host, and
453	* b) we are already connected to the foreign host by
454	* the time it gets to accept(), so... We simply accept
455	* here and SYN the local-host.
456	*/
457	void
458	tcp_connect(inso)
459	struct socket *inso;
460	{
461	struct socket *so;
462	struct sockaddr_in addr;
463	#ifndef VBOX
464	int addrlen = sizeof(struct sockaddr_in);
465	#else /* VBOX */
466	socklen_t addrlen = sizeof(struct sockaddr_in);
467	#endif /* VBOX */
468	struct tcpcb *tp;
469	int s, opt;
470
471	DEBUG_CALL("tcp_connect");
472	DEBUG_ARG("inso = %lx", (long)inso);
473
474	/*
475	* If it's an SS_ACCEPTONCE socket, no need to socreate()
476	* another socket, just use the accept() socket.
477	*/
478	if (inso->so_state & SS_FACCEPTONCE) {
479	/* FACCEPTONCE already have a tcpcb */
480	so = inso;
481	} else {
482	if ((so = socreate()) == NULL) {
483	/* If it failed, get rid of the pending connection */
484	closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
485	return;
486	}
487	if (tcp_attach(so) < 0) {
488	free(so); /* NOT sofree */
489	return;
490	}
491	so->so_laddr = inso->so_laddr;
492	so->so_lport = inso->so_lport;
493	}
494
495	(void) tcp_mss(sototcpcb(so), 0);
496
497	if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
498	tcp_close(sototcpcb(so)); /* This will sofree() as well */
499	return;
500	}
501	fd_nonblock(s);
502	opt = 1;
503	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
504	opt = 1;
505	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
506
507	so->so_fport = addr.sin_port;
508	so->so_faddr = addr.sin_addr;
509	/* Translate connections from localhost to the real hostname */
510	if (so->so_faddr.s_addr == 0 \|\| so->so_faddr.s_addr == loopback_addr.s_addr)
511	so->so_faddr = alias_addr;
512
513	/* Close the accept() socket, set right state */
514	if (inso->so_state & SS_FACCEPTONCE) {
515	closesocket(so->s); /* If we only accept once, close the accept() socket */
516	so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
517	/* if it's not FACCEPTONCE, it's already NOFDREF */
518	}
519	so->s = s;
520
521	so->so_iptos = tcp_tos(so);
522	tp = sototcpcb(so);
523
524	tcp_template(tp);
525
526	/* Compute window scaling to request. */
527	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
528	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
529	* tp->request_r_scale++;
530	*/
531
532	/* soisconnecting(so); / / NOFDREF used instead */
533	tcpstat.tcps_connattempt++;
534
535	tp->t_state = TCPS_SYN_SENT;
536	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
537	tp->iss = tcp_iss;
538	tcp_iss += TCP_ISSINCR/2;
539	tcp_sendseqinit(tp);
540	tcp_output(tp);
541	}
542
543	/*
544	* Attach a TCPCB to a socket.
545	*/
546	int
547	tcp_attach(so)
548	struct socket *so;
549	{
550	if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
551	return -1;
552
553	insque(so, &tcb);
554
555	return 0;
556	}
557
558	/*
559	* Set the socket's type of service field
560	*/
561	struct tos_t tcptos[] = {
562	{0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
563	{21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
564	{0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
565	{0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
566	{0, 513, IPTOS_LOWDELAY, EMU_RLOGIN\|EMU_NOCONNECT}, /* rlogin */
567	{0, 514, IPTOS_LOWDELAY, EMU_RSH\|EMU_NOCONNECT}, /* shell */
568	{0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
569	{0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
570	{0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
571	{0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
572	{0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
573	{0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
574	{0, 0, 0, 0}
575	};
576
577	struct emu_t *tcpemu = 0;
578
579	/*
580	* Return TOS according to the above table
581	*/
582	u_int8_t
583	tcp_tos(so)
584	struct socket *so;
585	{
586	int i = 0;
587	struct emu_t *emup;
588
589	while(tcptos[i].tos) {
590	if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) \|\|
591	(tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
592	so->so_emu = tcptos[i].emu;
593	return tcptos[i].tos;
594	}
595	i++;
596	}
597
598	/* Nope, lets see if there's a user-added one */
599	for (emup = tcpemu; emup; emup = emup->next) {
600	if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) \|\|
601	(emup->lport && (ntohs(so->so_lport) == emup->lport))) {
602	so->so_emu = emup->emu;
603	return emup->tos;
604	}
605	}
606
607	return 0;
608	}
609
610	int do_echo = -1;
611
612	/*
613	* Emulate programs that try and connect to us
614	* This includes ftp (the data connection is
615	* initiated by the server) and IRC (DCC CHAT and
616	* DCC SEND) for now
617	*
618	* NOTE: It's possible to crash SLiRP by sending it
619	* unstandard strings to emulate... if this is a problem,
620	* more checks are needed here
621	*
622	* XXX Assumes the whole command came in one packet
623	*
624	* XXX Some ftp clients will have their TOS set to
625	* LOWDELAY and so Nagel will kick in. Because of this,
626	* we'll get the first letter, followed by the rest, so
627	* we simply scan for ORT instead of PORT...
628	* DCC doesn't have this problem because there's other stuff
629	* in the packet before the DCC command.
630	*
631	* Return 1 if the mbuf m is still valid and should be
632	* sbappend()ed
633	*
634	* NOTE: if you return 0 you MUST m_free() the mbuf!
635	*/
636	int
637	tcp_emu(so, m)
638	struct socket *so;
639	struct mbuf *m;
640	{
641	u_int n1, n2, n3, n4, n5, n6;
642	char buff[256];
643	u_int32_t laddr;
644	u_int lport;
645	char *bptr;
646
647	DEBUG_CALL("tcp_emu");
648	DEBUG_ARG("so = %lx", (long)so);
649	DEBUG_ARG("m = %lx", (long)m);
650
651	switch(so->so_emu) {
652	int x, i;
653
654	case EMU_IDENT:
655	/*
656	* Identification protocol as per rfc-1413
657	*/
658
659	{
660	struct socket *tmpso;
661	struct sockaddr_in addr;
662	#ifndef VBOX
663	int addrlen = sizeof(struct sockaddr_in);
664	#else /* VBOX */
665	socklen_t addrlen = sizeof(struct sockaddr_in);
666	#endif /* VBOX */
667	struct sbuf *so_rcv = &so->so_rcv;
668
669	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
670	so_rcv->sb_wptr += m->m_len;
671	so_rcv->sb_rptr += m->m_len;
672	m->m_data[m->m_len] = 0; /* NULL terminate */
673	if (strchr(m->m_data, '\r') \|\| strchr(m->m_data, '\n')) {
674	#ifdef VBOX
675	if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
676	#else
677	if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) {
678	#endif
679	HTONS(n1);
680	HTONS(n2);
681	/* n2 is the one on our host */
682	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
683	if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
684	tmpso->so_lport == n2 &&
685	tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
686	tmpso->so_fport == n1) {
687	if (getsockname(tmpso->s,
688	(struct sockaddr *)&addr, &addrlen) == 0)
689	n2 = ntohs(addr.sin_port);
690	break;
691	}
692	}
693	}
694	so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
695	so_rcv->sb_rptr = so_rcv->sb_data;
696	so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
697	}
698	m_free(m);
699	return 0;
700	}
701
702	#if 0
703	case EMU_RLOGIN:
704	/*
705	* Rlogin emulation
706	* First we accumulate all the initial option negotiation,
707	* then fork_exec() rlogin according to the options
708	*/
709	{
710	int i, i2, n;
711	char *ptr;
712	char args[100];
713	char term[100];
714	struct sbuf *so_snd = &so->so_snd;
715	struct sbuf *so_rcv = &so->so_rcv;
716
717	/* First check if they have a priveladged port, or too much data has arrived */
718	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
719	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
720	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
721	so_snd->sb_wptr += 18;
722	so_snd->sb_cc += 18;
723	tcp_sockclosed(sototcpcb(so));
724	m_free(m);
725	return 0;
726	}
727
728	/* Append the current data */
729	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
730	so_rcv->sb_wptr += m->m_len;
731	so_rcv->sb_rptr += m->m_len;
732	m_free(m);
733
734	/*
735	* Check if we have all the initial options,
736	* and build argument list to rlogin while we're here
737	*/
738	n = 0;
739	ptr = so_rcv->sb_data;
740	args[0] = 0;
741	term[0] = 0;
742	while (ptr < so_rcv->sb_wptr) {
743	if (*ptr++ == 0) {
744	n++;
745	if (n == 2) {
746	sprintf(args, "rlogin -l %s %s",
747	ptr, inet_ntoa(so->so_faddr));
748	} else if (n == 3) {
749	i2 = so_rcv->sb_wptr - ptr;
750	for (i = 0; i < i2; i++) {
751	if (ptr[i] == '/') {
752	ptr[i] = 0;
753	#ifdef HAVE_SETENV
754	sprintf(term, "%s", ptr);
755	#else
756	sprintf(term, "TERM=%s", ptr);
757	#endif
758	ptr[i] = '/';
759	break;
760	}
761	}
762	}
763	}
764	}
765
766	if (n != 4)
767	return 0;
768
769	/* We have it, set our term variable and fork_exec() */
770	#ifdef HAVE_SETENV
771	setenv("TERM", term, 1);
772	#else
773	putenv(term);
774	#endif
775	fork_exec(so, args, 2);
776	term[0] = 0;
777	so->so_emu = 0;
778
779	/* And finally, send the client a 0 character */
780	so_snd->sb_wptr[0] = 0;
781	so_snd->sb_wptr++;
782	so_snd->sb_cc++;
783
784	return 0;
785	}
786
787	case EMU_RSH:
788	/*
789	* rsh emulation
790	* First we accumulate all the initial option negotiation,
791	* then rsh_exec() rsh according to the options
792	*/
793	{
794	int n;
795	char *ptr;
796	char *user;
797	char *args;
798	struct sbuf *so_snd = &so->so_snd;
799	struct sbuf *so_rcv = &so->so_rcv;
800
801	/* First check if they have a priveladged port, or too much data has arrived */
802	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
803	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
804	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
805	so_snd->sb_wptr += 18;
806	so_snd->sb_cc += 18;
807	tcp_sockclosed(sototcpcb(so));
808	m_free(m);
809	return 0;
810	}
811
812	/* Append the current data */
813	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
814	so_rcv->sb_wptr += m->m_len;
815	so_rcv->sb_rptr += m->m_len;
816	m_free(m);
817
818	/*
819	* Check if we have all the initial options,
820	* and build argument list to rlogin while we're here
821	*/
822	n = 0;
823	ptr = so_rcv->sb_data;
824	user="";
825	args="";
826	if (so->extra==NULL) {
827	struct socket *ns;
828	struct tcpcb* tp;
829	int port=atoi(ptr);
830	if (port <= 0) return 0;
831	if (port > 1023 \|\| port < 512) {
832	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
833	so_snd->sb_wptr += 18;
834	so_snd->sb_cc += 18;
835	tcp_sockclosed(sototcpcb(so));
836	return 0;
837	}
838	if ((ns=socreate()) == NULL)
839	return 0;
840	if (tcp_attach(ns)<0) {
841	free(ns);
842	return 0;
843	}
844
845	ns->so_laddr=so->so_laddr;
846	ns->so_lport=htons(port);
847
848	(void) tcp_mss(sototcpcb(ns), 0);
849
850	ns->so_faddr=so->so_faddr;
851	ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
852
853	if (ns->so_faddr.s_addr == 0 \|\|
854	ns->so_faddr.s_addr == loopback_addr.s_addr)
855	ns->so_faddr = alias_addr;
856
857	ns->so_iptos = tcp_tos(ns);
858	tp = sototcpcb(ns);
859
860	tcp_template(tp);
861
862	/* Compute window scaling to request. */
863	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
864	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
865	* tp->request_r_scale++;
866	*/
867
868	/soisfconnecting(ns);/
869
870	tcpstat.tcps_connattempt++;
871
872	tp->t_state = TCPS_SYN_SENT;
873	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
874	tp->iss = tcp_iss;
875	tcp_iss += TCP_ISSINCR/2;
876	tcp_sendseqinit(tp);
877	tcp_output(tp);
878	so->extra=ns;
879	}
880	while (ptr < so_rcv->sb_wptr) {
881	if (*ptr++ == 0) {
882	n++;
883	if (n == 2) {
884	user=ptr;
885	} else if (n == 3) {
886	args=ptr;
887	}
888	}
889	}
890
891	if (n != 4)
892	return 0;
893
894	rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
895	so->so_emu = 0;
896	so->extra=NULL;
897
898	/* And finally, send the client a 0 character */
899	so_snd->sb_wptr[0] = 0;
900	so_snd->sb_wptr++;
901	so_snd->sb_cc++;
902
903	return 0;
904	}
905
906	case EMU_CTL:
907	{
908	int num;
909	struct sbuf *so_snd = &so->so_snd;
910	struct sbuf *so_rcv = &so->so_rcv;
911
912	/*
913	* If there is binary data here, we save it in so->so_m
914	*/
915	if (!so->so_m) {
916	int rxlen;
917	char *rxdata;
918	rxdata=mtod(m, char *);
919	for (rxlen=m->m_len; rxlen; rxlen--) {
920	if (*rxdata++ & 0x80) {
921	so->so_m = m;
922	return 0;
923	}
924	}
925	} /* if(so->so_m==NULL) */
926
927	/*
928	* Append the line
929	*/
930	sbappendsb(so_rcv, m);
931
932	/* To avoid going over the edge of the buffer, we reset it */
933	if (so_snd->sb_cc == 0)
934	so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
935
936	/*
937	* A bit of a hack:
938	* If the first packet we get here is 1 byte long, then it
939	* was done in telnet character mode, therefore we must echo
940	* the characters as they come. Otherwise, we echo nothing,
941	* because in linemode, the line is already echoed
942	* XXX two or more control connections won't work
943	*/
944	if (do_echo == -1) {
945	if (m->m_len == 1) do_echo = 1;
946	else do_echo = 0;
947	}
948	if (do_echo) {
949	sbappendsb(so_snd, m);
950	m_free(m);
951	tcp_output(sototcpcb(so)); /* XXX */
952	} else
953	m_free(m);
954
955	num = 0;
956	while (num < so->so_rcv.sb_cc) {
957	if (*(so->so_rcv.sb_rptr + num) == '\n' \|\|
958	*(so->so_rcv.sb_rptr + num) == '\r') {
959	int n;
960
961	*(so_rcv->sb_rptr + num) = 0;
962	if (ctl_password && !ctl_password_ok) {
963	/* Need a password */
964	if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
965	if (strcmp(buff, ctl_password) == 0) {
966	ctl_password_ok = 1;
967	n = sprintf(so_snd->sb_wptr,
968	"Password OK.\r\n");
969	goto do_prompt;
970	}
971	}
972	n = sprintf(so_snd->sb_wptr,
973	"Error: Password required, log on with \"pass PASSWORD\"\r\n");
974	goto do_prompt;
975	}
976	cfg_quitting = 0;
977	n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
978	if (!cfg_quitting) {
979	/* Register the printed data */
980	do_prompt:
981	so_snd->sb_cc += n;
982	so_snd->sb_wptr += n;
983	/* Add prompt */
984	n = sprintf(so_snd->sb_wptr, "Slirp> ");
985	so_snd->sb_cc += n;
986	so_snd->sb_wptr += n;
987	}
988	/* Drop so_rcv data */
989	so_rcv->sb_cc = 0;
990	so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
991	tcp_output(sototcpcb(so)); /* Send the reply */
992	}
993	num++;
994	}
995	return 0;
996	}
997	#endif
998	case EMU_FTP: /* ftp */
999	(m->m_data+m->m_len) = 0; / NULL terminate for strstr */
1000	if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
1001	/*
1002	* Need to emulate the PORT command
1003	*/
1004	#ifdef VBOX
1005	x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
1006	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1007	#else
1008	x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
1009	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1010	#endif
1011	if (x < 6)
1012	return 1;
1013
1014	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1015	lport = htons((n5 << 8) \| (n6));
1016
1017	if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1018	return 1;
1019
1020	n6 = ntohs(so->so_fport);
1021
1022	n5 = (n6 >> 8) & 0xff;
1023	n6 &= 0xff;
1024
1025	laddr = ntohl(so->so_faddr.s_addr);
1026
1027	n1 = ((laddr >> 24) & 0xff);
1028	n2 = ((laddr >> 16) & 0xff);
1029	n3 = ((laddr >> 8) & 0xff);
1030	n4 = (laddr & 0xff);
1031
1032	m->m_len = bptr - m->m_data; /* Adjust length */
1033	m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
1034	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1035	return 1;
1036	} else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
1037	/*
1038	* Need to emulate the PASV response
1039	*/
1040	#ifdef VBOX
1041	x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
1042	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1043	#else
1044	x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
1045	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1046	#endif
1047	if (x < 6)
1048	return 1;
1049
1050	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1051	lport = htons((n5 << 8) \| (n6));
1052
1053	if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1054	return 1;
1055
1056	n6 = ntohs(so->so_fport);
1057
1058	n5 = (n6 >> 8) & 0xff;
1059	n6 &= 0xff;
1060
1061	laddr = ntohl(so->so_faddr.s_addr);
1062
1063	n1 = ((laddr >> 24) & 0xff);
1064	n2 = ((laddr >> 16) & 0xff);
1065	n3 = ((laddr >> 8) & 0xff);
1066	n4 = (laddr & 0xff);
1067
1068	m->m_len = bptr - m->m_data; /* Adjust length */
1069	m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1070	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1071
1072	return 1;
1073	}
1074
1075	return 1;
1076
1077	case EMU_KSH:
1078	/*
1079	* The kshell (Kerberos rsh) and shell services both pass
1080	* a local port port number to carry signals to the server
1081	* and stderr to the client. It is passed at the beginning
1082	* of the connection as a NUL-terminated decimal ASCII string.
1083	*/
1084	so->so_emu = 0;
1085	for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1086	if (m->m_data[i] < '0' \|\| m->m_data[i] > '9')
1087	return 1; /* invalid number */
1088	lport *= 10;
1089	lport += m->m_data[i] - '0';
1090	}
1091	if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1092	(so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1093	m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
1094	return 1;
1095
1096	case EMU_IRC:
1097	/*
1098	* Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1099	*/
1100	(m->m_data+m->m_len) = 0; / NULL terminate the string for strstr */
1101	if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1102	return 1;
1103
1104	/* The %256s is for the broken mIRC */
1105	if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1106	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1107	return 1;
1108
1109	m->m_len = bptr - m->m_data; /* Adjust length */
1110	m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
1111	(unsigned long)ntohl(so->so_faddr.s_addr),
1112	ntohs(so->so_fport), 1);
1113	} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1114	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1115	return 1;
1116
1117	m->m_len = bptr - m->m_data; /* Adjust length */
1118	m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
1119	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1120	ntohs(so->so_fport), n1, 1);
1121	} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1122	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1123	return 1;
1124
1125	m->m_len = bptr - m->m_data; /* Adjust length */
1126	m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
1127	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1128	ntohs(so->so_fport), n1, 1);
1129	}
1130	return 1;
1131
1132	case EMU_REALAUDIO:
1133	/*
1134	* RealAudio emulation - JP. We must try to parse the incoming
1135	* data and try to find the two characters that contain the
1136	* port number. Then we redirect an udp port and replace the
1137	* number with the real port we got.
1138	*
1139	* The 1.0 beta versions of the player are not supported
1140	* any more.
1141	*
1142	* A typical packet for player version 1.0 (release version):
1143	*
1144	* 0000:50 4E 41 00 05
1145	* 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....×..gælÜc..P
1146	* 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1147	* 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1148	* 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1149	*
1150	* Now the port number 0x1BD7 is found at offset 0x04 of the
1151	* Now the port number 0x1BD7 is found at offset 0x04 of the
1152	* second packet. This time we received five bytes first and
1153	* then the rest. You never know how many bytes you get.
1154	*
1155	* A typical packet for player version 2.0 (beta):
1156	*
1157	* 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........Á.
1158	* 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..Win2.0.0
1159	* 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1160	* 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1161	* 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1162	*
1163	* Port number 0x1BC1 is found at offset 0x0d.
1164	*
1165	* This is just a horrible switch statement. Variable ra tells
1166	* us where we're going.
1167	*/
1168
1169	bptr = m->m_data;
1170	while (bptr < m->m_data + m->m_len) {
1171	u_short p;
1172	static int ra = 0;
1173	char ra_tbl[4];
1174
1175	ra_tbl[0] = 0x50;
1176	ra_tbl[1] = 0x4e;
1177	ra_tbl[2] = 0x41;
1178	ra_tbl[3] = 0;
1179
1180	switch (ra) {
1181	case 0:
1182	case 2:
1183	case 3:
1184	if (*bptr++ != ra_tbl[ra]) {
1185	ra = 0;
1186	continue;
1187	}
1188	break;
1189
1190	case 1:
1191	/*
1192	* We may get 0x50 several times, ignore them
1193	*/
1194	if (*bptr == 0x50) {
1195	ra = 1;
1196	bptr++;
1197	continue;
1198	} else if (*bptr++ != ra_tbl[ra]) {
1199	ra = 0;
1200	continue;
1201	}
1202	break;
1203
1204	case 4:
1205	/*
1206	* skip version number
1207	*/
1208	bptr++;
1209	break;
1210
1211	case 5:
1212	/*
1213	* The difference between versions 1.0 and
1214	* 2.0 is here. For future versions of
1215	* the player this may need to be modified.
1216	*/
1217	if (*(bptr + 1) == 0x02)
1218	bptr += 8;
1219	else
1220	bptr += 4;
1221	break;
1222
1223	case 6:
1224	/* This is the field containing the port
1225	* number that RA-player is listening to.
1226	*/
1227	lport = (((u_char*)bptr)[0] << 8)
1228	+ ((u_char *)bptr)[1];
1229	if (lport < 6970)
1230	lport += 256; /* don't know why */
1231	if (lport < 6970 \|\| lport > 7170)
1232	return 1; /* failed */
1233
1234	/* try to get udp port between 6970 - 7170 */
1235	for (p = 6970; p < 7071; p++) {
1236	if (udp_listen( htons(p),
1237	so->so_laddr.s_addr,
1238	htons(lport),
1239	SS_FACCEPTONCE)) {
1240	break;
1241	}
1242	}
1243	if (p == 7071)
1244	p = 0;
1245	(u_char )bptr++ = (p >> 8) & 0xff;
1246	(u_char )bptr++ = p & 0xff;
1247	ra = 0;
1248	return 1; /* port redirected, we're done */
1249	break;
1250
1251	default:
1252	ra = 0;
1253	}
1254	ra++;
1255	}
1256	return 1;
1257
1258	default:
1259	/* Ooops, not emulated, won't call tcp_emu again */
1260	so->so_emu = 0;
1261	return 1;
1262	}
1263	}
1264
1265	/*
1266	* Do misc. config of SLiRP while its running.
1267	* Return 0 if this connections is to be closed, 1 otherwise,
1268	* return 2 if this is a command-line connection
1269	*/
1270	int
1271	tcp_ctl(so)
1272	struct socket *so;
1273	{
1274	struct sbuf *sb = &so->so_snd;
1275	int command;
1276	struct ex_list *ex_ptr;
1277	int do_pty;
1278	/* struct socket tmpso; /
1279
1280	DEBUG_CALL("tcp_ctl");
1281	DEBUG_ARG("so = %lx", (long )so);
1282
1283	#if 0
1284	/*
1285	* Check if they're authorised
1286	*/
1287	if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 \|\| (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1288	sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1289	sb->sb_wptr += sb->sb_cc;
1290	return 0;
1291	}
1292	#endif
1293	command = (ntohl(so->so_faddr.s_addr) & 0xff);
1294
1295	switch(command) {
1296	default: /* Check for exec's */
1297
1298	/*
1299	* Check if it's pty_exec
1300	*/
1301	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1302	if (ex_ptr->ex_fport == so->so_fport &&
1303	command == ex_ptr->ex_addr) {
1304	do_pty = ex_ptr->ex_pty;
1305	goto do_exec;
1306	}
1307	}
1308
1309	/*
1310	* Nothing bound..
1311	*/
1312	/* tcp_fconnect(so); */
1313
1314	/* FALLTHROUGH */
1315	case CTL_ALIAS:
1316	sb->sb_cc = sprintf(sb->sb_wptr,
1317	"Error: No application configured.\r\n");
1318	sb->sb_wptr += sb->sb_cc;
1319	return(0);
1320
1321	do_exec:
1322	DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1323	return(fork_exec(so, ex_ptr->ex_exec, do_pty));
1324
1325	#if 0
1326	case CTL_CMD:
1327	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1328	if (tmpso->so_emu == EMU_CTL &&
1329	!(tmpso->so_tcpcb?
1330	(tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT\|TCPS_LAST_ACK))
1331	:0)) {
1332	/* Ooops, control connection already active */
1333	sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1334	sb->sb_wptr += sb->sb_cc;
1335	return 0;
1336	}
1337	}
1338	so->so_emu = EMU_CTL;
1339	ctl_password_ok = 0;
1340	sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1341	sb->sb_wptr += sb->sb_cc;
1342	do_echo=-1;
1343	return(2);
1344	#endif
1345	}
1346	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/tcp_subr.c@ 207

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