tcp_subr.c@ 1052

最後變更在這個檔案從1052是 1052,由 vboxsync 提交於 18 年前
silly typo
屬性 svn:eol-style 設為 `native`
檔案大小: 42.3 KB

行
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	#ifndef VBOX
49	/* patchable/settable parameters for tcp */
50	int tcp_mssdflt = TCP_MSS;
51	int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
52	int tcp_do_rfc1323 = 0; /* Don't do rfc1323 performance enhancements */
53	int tcp_rcvspace; /* You may want to change this */
54	int tcp_sndspace; /* Keep small if you have an error prone link */
55	#endif /* !VBOX */
56
57	/*
58	* Tcp initialization
59	*/
60	void
61	#ifdef VBOX
62	tcp_init(PNATState pData)
63	#else /* !VBOX */
64	tcp_init()
65	#endif /* !VBOX */
66	{
67	tcp_iss = 1; /* wrong */
68	tcb.so_next = tcb.so_prev = &tcb;
69	#ifdef VBOX
70	tcp_last_so = &tcb;
71	#endif /* VBOX */
72
73	#ifndef VBOX
74	/* tcp_rcvspace = our Window we advertise to the remote */
75	tcp_rcvspace = TCP_RCVSPACE;
76	tcp_sndspace = TCP_SNDSPACE;
77
78	/* Make sure tcp_sndspace is at least 2MSS /
79	if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
80	tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
81	#endif /* !VBOX */
82	}
83
84	/*
85	* Create template to be used to send tcp packets on a connection.
86	* Call after host entry created, fills
87	* in a skeletal tcp/ip header, minimizing the amount of work
88	* necessary when the connection is used.
89	*/
90	/* struct tcpiphdr * */
91	void
92	tcp_template(tp)
93	struct tcpcb *tp;
94	{
95	struct socket *so = tp->t_socket;
96	register struct tcpiphdr *n = &tp->t_template;
97
98	n->ti_next = n->ti_prev = 0;
99	n->ti_x1 = 0;
100	n->ti_pr = IPPROTO_TCP;
101	n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
102	n->ti_src = so->so_faddr;
103	n->ti_dst = so->so_laddr;
104	n->ti_sport = so->so_fport;
105	n->ti_dport = so->so_lport;
106
107	n->ti_seq = 0;
108	n->ti_ack = 0;
109	n->ti_x2 = 0;
110	n->ti_off = 5;
111	n->ti_flags = 0;
112	n->ti_win = 0;
113	n->ti_sum = 0;
114	n->ti_urp = 0;
115	}
116
117	/*
118	* Send a single message to the TCP at address specified by
119	* the given TCP/IP header. If m == 0, then we make a copy
120	* of the tcpiphdr at ti and send directly to the addressed host.
121	* This is used to force keep alive messages out using the TCP
122	* template for a connection tp->t_template. If flags are given
123	* then we send a message back to the TCP which originated the
124	* segment ti, and discard the mbuf containing it and any other
125	* attached mbufs.
126	*
127	* In any case the ack and sequence number of the transmitted
128	* segment are as specified by the parameters.
129	*/
130	void
131	#ifdef VBOX
132	tcp_respond(PNATState pData, struct tcpcb tp, struct tcpiphdr ti, struct mbuf *m, tcp_seq ack, tcp_seq seq, int flags)
133	#else /* !VBOX */
134	tcp_respond(tp, ti, m, ack, seq, flags)
135	struct tcpcb *tp;
136	register struct tcpiphdr *ti;
137	register struct mbuf *m;
138	tcp_seq ack, seq;
139	int flags;
140	#endif /* !VBOX */
141	{
142	register int tlen;
143	int win = 0;
144
145	DEBUG_CALL("tcp_respond");
146	DEBUG_ARG("tp = %lx", (long)tp);
147	DEBUG_ARG("ti = %lx", (long)ti);
148	DEBUG_ARG("m = %lx", (long)m);
149	DEBUG_ARG("ack = %u", ack);
150	DEBUG_ARG("seq = %u", seq);
151	DEBUG_ARG("flags = %x", flags);
152
153	if (tp)
154	win = sbspace(&tp->t_socket->so_rcv);
155	if (m == 0) {
156	#ifdef VBOX
157	if ((m = m_get(pData)) == NULL)
158	#else /* !VBOX */
159	if ((m = m_get()) == NULL)
160	#endif /* !VBOX */
161	return;
162	#ifdef TCP_COMPAT_42
163	tlen = 1;
164	#else
165	tlen = 0;
166	#endif
167	m->m_data += if_maxlinkhdr;
168	mtod(m, struct tcpiphdr ) = *ti;
169	ti = mtod(m, struct tcpiphdr *);
170	flags = TH_ACK;
171	} else {
172	/*
173	* ti points into m so the next line is just making
174	* the mbuf point to ti
175	*/
176	m->m_data = (caddr_t)ti;
177
178	m->m_len = sizeof (struct tcpiphdr);
179	tlen = 0;
180	#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
181	xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
182	xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
183	#undef xchg
184	}
185	ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
186	tlen += sizeof (struct tcpiphdr);
187	m->m_len = tlen;
188
189	ti->ti_next = ti->ti_prev = 0;
190	ti->ti_x1 = 0;
191	ti->ti_seq = htonl(seq);
192	ti->ti_ack = htonl(ack);
193	ti->ti_x2 = 0;
194	ti->ti_off = sizeof (struct tcphdr) >> 2;
195	ti->ti_flags = flags;
196	if (tp)
197	ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
198	else
199	ti->ti_win = htons((u_int16_t)win);
200	ti->ti_urp = 0;
201	ti->ti_sum = 0;
202	ti->ti_sum = cksum(m, tlen);
203	((struct ip *)ti)->ip_len = tlen;
204
205	if(flags & TH_RST)
206	((struct ip *)ti)->ip_ttl = MAXTTL;
207	else
208	((struct ip *)ti)->ip_ttl = ip_defttl;
209
210	#ifdef VBOX
211	(void) ip_output(pData, (struct socket *)0, m);
212	#else /* !VBOX */
213	(void) ip_output((struct socket *)0, m);
214	#endif /* !VBOX */
215	}
216
217	/*
218	* Create a new TCP control block, making an
219	* empty reassembly queue and hooking it to the argument
220	* protocol control block.
221	*/
222	struct tcpcb *
223	tcp_newtcpcb(PNATState pData, struct socket *so)
224	{
225	register struct tcpcb *tp;
226
227	tp = (struct tcpcb )malloc(sizeof(tp));
228	if (tp == NULL)
229	return ((struct tcpcb *)0);
230
231	memset((char *) tp, 0, sizeof(struct tcpcb));
232	tp->seg_next = tp->seg_prev = ptr_to_u32(pData, (struct tcpiphdr *)tp);
233	tp->t_maxseg = tcp_mssdflt;
234
235	tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE\|TF_REQ_TSTMP) : 0;
236	tp->t_socket = so;
237
238	/*
239	* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
240	* rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
241	* reasonable initial retransmit time.
242	*/
243	tp->t_srtt = TCPTV_SRTTBASE;
244	tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
245	tp->t_rttmin = TCPTV_MIN;
246
247	TCPT_RANGESET(tp->t_rxtcur,
248	((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
249	TCPTV_MIN, TCPTV_REXMTMAX);
250
251	tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
252	tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
253	tp->t_state = TCPS_CLOSED;
254
255	so->so_tcpcb = tp;
256
257	return (tp);
258	}
259
260	/*
261	* Drop a TCP connection, reporting
262	* the specified error. If connection is synchronized,
263	* then send a RST to peer.
264	*/
265	#ifdef VBOX
266	struct tcpcb tcp_drop(PNATState pData, struct tcpcb tp, int err)
267	#else /* !VBOX */
268	struct tcpcb tcp_drop(struct tcpcb tp, int err)
269	#endif /* !VBOX */
270	{
271	/* tcp_drop(tp, errno)
272	register struct tcpcb *tp;
273	int errno;
274	{
275	*/
276
277	DEBUG_CALL("tcp_drop");
278	DEBUG_ARG("tp = %lx", (long)tp);
279	DEBUG_ARG("errno = %d", errno);
280
281	if (TCPS_HAVERCVDSYN(tp->t_state)) {
282	tp->t_state = TCPS_CLOSED;
283	#ifdef VBOX
284	(void) tcp_output(pData, tp);
285	#else /* !VBOX */
286	(void) tcp_output(tp);
287	#endif /* !VBOX */
288	tcpstat.tcps_drops++;
289	} else
290	tcpstat.tcps_conndrops++;
291	/* if (errno == ETIMEDOUT && tp->t_softerror)
292	* errno = tp->t_softerror;
293	*/
294	/* so->so_error = errno; */
295	#ifdef VBOX
296	return (tcp_close(pData, tp));
297	#else /* !VBOX */
298	return (tcp_close(tp));
299	#endif /* !VBOX */
300	}
301
302	/*
303	* Close a TCP control block:
304	* discard all space held by the tcp
305	* discard internet protocol block
306	* wake up any sleepers
307	*/
308	struct tcpcb *
309	#ifdef VBOX
310	tcp_close(PNATState pData, register struct tcpcb *tp)
311	#else /* !VBOX */
312	tcp_close(tp)
313	register struct tcpcb *tp;
314	#endif /* !VBOX */
315	{
316	register struct tcpiphdr *t;
317	struct socket *so = tp->t_socket;
318	register struct mbuf *m;
319
320	DEBUG_CALL("tcp_close");
321	DEBUG_ARG("tp = %lx", (long )tp);
322
323	/* free the reassembly queue, if any */
324	t = u32_to_ptr(pData, tp->seg_next, struct tcpiphdr *);
325	while (t != (struct tcpiphdr *)tp) {
326	t = u32_to_ptr(pData, t->ti_next, struct tcpiphdr *);
327	m = REASS_MBUF_GET(u32_to_ptr(pData, t->ti_prev, struct tcpiphdr *));
328	remque_32(pData, u32_to_ptr(pData, t->ti_prev, struct tcpiphdr *));
329	#ifdef VBOX
330	m_freem(pData, m);
331	#else /* !VBOX */
332	m_freem(m);
333	#endif /* !VBOX */
334	}
335	/* It's static */
336	/* if (tp->t_template)
337	* (void) m_free(dtom(tp->t_template));
338	*/
339	/* free(tp, M_PCB); */
340	u32ptr_done(pData, ptr_to_u32(pData, tp), tp);
341	free(tp);
342	so->so_tcpcb = 0;
343	soisfdisconnected(so);
344	/* clobber input socket cache if we're closing the cached connection */
345	if (so == tcp_last_so)
346	tcp_last_so = &tcb;
347	closesocket(so->s);
348	sbfree(&so->so_rcv);
349	sbfree(&so->so_snd);
350	#ifdef VBOX
351	sofree(pData, so);
352	#else /* !VBOX */
353	sofree(so);
354	#endif /* !VBOX */
355	tcpstat.tcps_closed++;
356	return ((struct tcpcb *)0);
357	}
358
359	void
360	tcp_drain()
361	{
362	/* XXX */
363	}
364
365	/*
366	* When a source quench is received, close congestion window
367	* to one segment. We will gradually open it again as we proceed.
368	*/
369
370	#ifdef notdef
371
372	void
373	tcp_quench(i, errno)
374
375	int errno;
376	{
377	struct tcpcb *tp = intotcpcb(inp);
378
379	if (tp)
380	tp->snd_cwnd = tp->t_maxseg;
381	}
382
383	#endif /* notdef */
384
385	/*
386	* TCP protocol interface to socket abstraction.
387	*/
388
389	/*
390	* User issued close, and wish to trail through shutdown states:
391	* if never received SYN, just forget it. If got a SYN from peer,
392	* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
393	* If already got a FIN from peer, then almost done; go to LAST_ACK
394	* state. In all other cases, have already sent FIN to peer (e.g.
395	* after PRU_SHUTDOWN), and just have to play tedious game waiting
396	* for peer to send FIN or not respond to keep-alives, etc.
397	* We can let the user exit from the close as soon as the FIN is acked.
398	*/
399	void
400	#ifdef VBOX
401	tcp_sockclosed(PNATState pData, struct tcpcb *tp)
402	#else /* !VBOX */
403	tcp_sockclosed(tp)
404	struct tcpcb *tp;
405	#endif /* !VBOX */
406	{
407
408	DEBUG_CALL("tcp_sockclosed");
409	DEBUG_ARG("tp = %lx", (long)tp);
410
411	switch (tp->t_state) {
412
413	case TCPS_CLOSED:
414	case TCPS_LISTEN:
415	case TCPS_SYN_SENT:
416	tp->t_state = TCPS_CLOSED;
417	#ifdef VBOX
418	tp = tcp_close(pData, tp);
419	#else /* !VBOX */
420	tp = tcp_close(tp);
421	#endif /* !VBOX */
422	break;
423
424	case TCPS_SYN_RECEIVED:
425	case TCPS_ESTABLISHED:
426	tp->t_state = TCPS_FIN_WAIT_1;
427	break;
428
429	case TCPS_CLOSE_WAIT:
430	tp->t_state = TCPS_LAST_ACK;
431	break;
432	}
433	/* soisfdisconnecting(tp->t_socket); */
434	if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
435	soisfdisconnected(tp->t_socket);
436	if (tp)
437	#ifdef VBOX
438	tcp_output(pData, tp);
439	#else /* !VBOX */
440	tcp_output(tp);
441	#endif /* !VBOX */
442	}
443
444	/*
445	* Connect to a host on the Internet
446	* Called by tcp_input
447	* Only do a connect, the tcp fields will be set in tcp_input
448	* return 0 if there's a result of the connect,
449	* else return -1 means we're still connecting
450	* The return value is almost always -1 since the socket is
451	* nonblocking. Connect returns after the SYN is sent, and does
452	* not wait for ACK+SYN.
453	*/
454	#ifdef VBOX
455	int tcp_fconnect(PNATState pData, struct socket *so)
456	#else /* !VBOX */
457	int tcp_fconnect(so)
458	struct socket *so;
459	#endif /* !VBOX */
460	{
461	int ret=0;
462
463	DEBUG_CALL("tcp_fconnect");
464	DEBUG_ARG("so = %lx", (long )so);
465
466	if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
467	int opt, s=so->s;
468	struct sockaddr_in addr;
469
470	fd_nonblock(s);
471	opt = 1;
472	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
473	opt = 1;
474	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
475
476	addr.sin_family = AF_INET;
477	if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
478	/* It's an alias */
479	switch(ntohl(so->so_faddr.s_addr) & 0xff) {
480	case CTL_DNS:
481	addr.sin_addr = dns_addr;
482	break;
483	case CTL_ALIAS:
484	default:
485	addr.sin_addr = loopback_addr;
486	break;
487	}
488	} else
489	addr.sin_addr = so->so_faddr;
490	addr.sin_port = so->so_fport;
491
492	DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
493	"addr.sin_addr.s_addr=%.16s\n",
494	ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
495	/* We don't care what port we get */
496	ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
497
498	/*
499	* If it's not in progress, it failed, so we just return 0,
500	* without clearing SS_NOFDREF
501	*/
502	soisfconnecting(so);
503	}
504
505	return(ret);
506	}
507
508	/*
509	* Accept the socket and connect to the local-host
510	*
511	* We have a problem. The correct thing to do would be
512	* to first connect to the local-host, and only if the
513	* connection is accepted, then do an accept() here.
514	* But, a) we need to know who's trying to connect
515	* to the socket to be able to SYN the local-host, and
516	* b) we are already connected to the foreign host by
517	* the time it gets to accept(), so... We simply accept
518	* here and SYN the local-host.
519	*/
520	void
521	#ifdef VBOX
522	tcp_connect(PNATState pData, struct socket *inso)
523	#else /* !VBOX */
524	tcp_connect(inso)
525	struct socket *inso;
526	#endif /* !VBOX */
527	{
528	struct socket *so;
529	struct sockaddr_in addr;
530	#ifndef VBOX
531	int addrlen = sizeof(struct sockaddr_in);
532	#else /* VBOX */
533	socklen_t addrlen = sizeof(struct sockaddr_in);
534	#endif /* VBOX */
535	struct tcpcb *tp;
536	int s, opt;
537
538	DEBUG_CALL("tcp_connect");
539	DEBUG_ARG("inso = %lx", (long)inso);
540
541	/*
542	* If it's an SS_ACCEPTONCE socket, no need to socreate()
543	* another socket, just use the accept() socket.
544	*/
545	if (inso->so_state & SS_FACCEPTONCE) {
546	/* FACCEPTONCE already have a tcpcb */
547	so = inso;
548	} else {
549	if ((so = socreate()) == NULL) {
550	/* If it failed, get rid of the pending connection */
551	closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
552	return;
553	}
554	#ifdef VBOX
555	if (tcp_attach(pData, so) < 0) {
556	#else /* !VBOX */
557	if (tcp_attach(so) < 0) {
558	#endif /* !VBOX */
559	free(so); /* NOT sofree */
560	return;
561	}
562	so->so_laddr = inso->so_laddr;
563	so->so_lport = inso->so_lport;
564	}
565
566	#ifdef VBOX
567	(void) tcp_mss(pData, sototcpcb(so), 0);
568	#else /* !VBOX */
569	(void) tcp_mss(sototcpcb(so), 0);
570	#endif /* !VBOX */
571
572	if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
573	#ifdef VBOX
574	tcp_close(pData, sototcpcb(so)); /* This will sofree() as well */
575	#else /* !VBOX */
576	tcp_close(sototcpcb(so)); /* This will sofree() as well */
577	#endif /* !VBOX */
578	return;
579	}
580	fd_nonblock(s);
581	opt = 1;
582	setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
583	opt = 1;
584	setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
585	opt = 1;
586	setsockopt(s,IPPROTO_TCP,TCP_NODELAY,(char *)&opt,sizeof(int));
587
588	so->so_fport = addr.sin_port;
589	so->so_faddr = addr.sin_addr;
590	/* Translate connections from localhost to the real hostname */
591	if (so->so_faddr.s_addr == 0 \|\| so->so_faddr.s_addr == loopback_addr.s_addr)
592	so->so_faddr = alias_addr;
593
594	/* Close the accept() socket, set right state */
595	if (inso->so_state & SS_FACCEPTONCE) {
596	closesocket(so->s); /* If we only accept once, close the accept() socket */
597	so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
598	/* if it's not FACCEPTONCE, it's already NOFDREF */
599	}
600	so->s = s;
601
602	so->so_iptos = tcp_tos(so);
603	tp = sototcpcb(so);
604
605	tcp_template(tp);
606
607	/* Compute window scaling to request. */
608	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
609	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
610	* tp->request_r_scale++;
611	*/
612
613	/* soisconnecting(so); / / NOFDREF used instead */
614	tcpstat.tcps_connattempt++;
615
616	tp->t_state = TCPS_SYN_SENT;
617	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
618	tp->iss = tcp_iss;
619	tcp_iss += TCP_ISSINCR/2;
620	tcp_sendseqinit(tp);
621	#ifdef VBOX
622	tcp_output(pData, tp);
623	#else /* !VBOX */
624	tcp_output(tp);
625	#endif /* !VBOX */
626	}
627
628	/*
629	* Attach a TCPCB to a socket.
630	*/
631	int
632	#ifdef VBOX
633	tcp_attach(PNATState pData, struct socket *so)
634	#else /* !VBOX */
635	tcp_attach(so)
636	struct socket *so;
637	#endif /* !VBOX */
638	{
639	if ((so->so_tcpcb = tcp_newtcpcb(pData, so)) == NULL)
640	return -1;
641
642	insque(pData, so, &tcb);
643
644	return 0;
645	}
646
647	/*
648	* Set the socket's type of service field
649	*/
650	#ifdef VBOX
651	static const struct tos_t tcptos[] = {
652	#else /* !VBOX */
653	struct tos_t tcptos[] = {
654	#endif /* !VBOX */
655	{0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
656	{21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
657	{0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
658	{0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
659	{0, 513, IPTOS_LOWDELAY, EMU_RLOGIN\|EMU_NOCONNECT}, /* rlogin */
660	{0, 514, IPTOS_LOWDELAY, EMU_RSH\|EMU_NOCONNECT}, /* shell */
661	{0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
662	{0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
663	{0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
664	{0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
665	{0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
666	{0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
667	{0, 0, 0, 0}
668	};
669
670	#ifndef VBOX
671	struct emu_t *tcpemu = 0;
672	#endif /* !VBOX */
673
674	/*
675	* Return TOS according to the above table
676	*/
677	u_int8_t
678	tcp_tos(so)
679	struct socket *so;
680	{
681	int i = 0;
682	#ifndef VBOX
683	struct emu_t *emup;
684	#endif /* !VBOX */
685
686	while(tcptos[i].tos) {
687	if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) \|\|
688	(tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
689	so->so_emu = tcptos[i].emu;
690	return tcptos[i].tos;
691	}
692	i++;
693	}
694
695	#ifdef VBOX
696	/* No user-added emulators supported. */
697	#else /* !VBOX */
698	/* Nope, lets see if there's a user-added one */
699	for (emup = tcpemu; emup; emup = emup->next) {
700	if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) \|\|
701	(emup->lport && (ntohs(so->so_lport) == emup->lport))) {
702	so->so_emu = emup->emu;
703	return emup->tos;
704	}
705	}
706	#endif /* !VBOX */
707
708	return 0;
709	}
710
711	#ifndef VBOX
712	int do_echo = -1;
713	#endif /* !VBOX */
714
715	/*
716	* Emulate programs that try and connect to us
717	* This includes ftp (the data connection is
718	* initiated by the server) and IRC (DCC CHAT and
719	* DCC SEND) for now
720	*
721	* NOTE: It's possible to crash SLiRP by sending it
722	* unstandard strings to emulate... if this is a problem,
723	* more checks are needed here
724	*
725	* XXX Assumes the whole command came in one packet
726	*
727	* XXX Some ftp clients will have their TOS set to
728	* LOWDELAY and so Nagel will kick in. Because of this,
729	* we'll get the first letter, followed by the rest, so
730	* we simply scan for ORT instead of PORT...
731	* DCC doesn't have this problem because there's other stuff
732	* in the packet before the DCC command.
733	*
734	* Return 1 if the mbuf m is still valid and should be
735	* sbappend()ed
736	*
737	* NOTE: if you return 0 you MUST m_free() the mbuf!
738	*/
739	int
740	#ifdef VBOX
741	tcp_emu(PNATState pData, struct socket so, struct mbuf m)
742	#else /* !VBOX */
743	tcp_emu(so, m)
744	struct socket *so;
745	struct mbuf *m;
746	#endif /* !VBOX */
747	{
748	u_int n1, n2, n3, n4, n5, n6;
749	char buff[256];
750	u_int32_t laddr;
751	u_int lport;
752	char *bptr;
753
754	DEBUG_CALL("tcp_emu");
755	DEBUG_ARG("so = %lx", (long)so);
756	DEBUG_ARG("m = %lx", (long)m);
757
758	switch(so->so_emu) {
759	int x, i;
760
761	case EMU_IDENT:
762	/*
763	* Identification protocol as per rfc-1413
764	*/
765
766	{
767	struct socket *tmpso;
768	struct sockaddr_in addr;
769	#ifndef VBOX
770	int addrlen = sizeof(struct sockaddr_in);
771	#else /* VBOX */
772	socklen_t addrlen = sizeof(struct sockaddr_in);
773	#endif /* VBOX */
774	struct sbuf *so_rcv = &so->so_rcv;
775
776	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
777	so_rcv->sb_wptr += m->m_len;
778	so_rcv->sb_rptr += m->m_len;
779	m->m_data[m->m_len] = 0; /* NULL terminate */
780	if (strchr(m->m_data, '\r') \|\| strchr(m->m_data, '\n')) {
781	#ifdef VBOX
782	if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
783	#else
784	if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) {
785	#endif
786	HTONS(n1);
787	HTONS(n2);
788	/* n2 is the one on our host */
789	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
790	if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
791	tmpso->so_lport == n2 &&
792	tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
793	tmpso->so_fport == n1) {
794	if (getsockname(tmpso->s,
795	(struct sockaddr *)&addr, &addrlen) == 0)
796	n2 = ntohs(addr.sin_port);
797	break;
798	}
799	}
800	}
801	so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
802	so_rcv->sb_rptr = so_rcv->sb_data;
803	so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
804	}
805	#ifdef VBOX
806	m_free(pData, m);
807	#else /* !VBOX */
808	m_free(m);
809	#endif /* !VBOX */
810	return 0;
811	}
812
813	#if 0
814	case EMU_RLOGIN:
815	/*
816	* Rlogin emulation
817	* First we accumulate all the initial option negotiation,
818	* then fork_exec() rlogin according to the options
819	*/
820	{
821	int i, i2, n;
822	char *ptr;
823	char args[100];
824	char term[100];
825	struct sbuf *so_snd = &so->so_snd;
826	struct sbuf *so_rcv = &so->so_rcv;
827
828	/* First check if they have a priveladged port, or too much data has arrived */
829	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
830	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
831	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
832	so_snd->sb_wptr += 18;
833	so_snd->sb_cc += 18;
834	tcp_sockclosed(sototcpcb(so));
835	m_free(m);
836	return 0;
837	}
838
839	/* Append the current data */
840	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
841	so_rcv->sb_wptr += m->m_len;
842	so_rcv->sb_rptr += m->m_len;
843	m_free(m);
844
845	/*
846	* Check if we have all the initial options,
847	* and build argument list to rlogin while we're here
848	*/
849	n = 0;
850	ptr = so_rcv->sb_data;
851	args[0] = 0;
852	term[0] = 0;
853	while (ptr < so_rcv->sb_wptr) {
854	if (*ptr++ == 0) {
855	n++;
856	if (n == 2) {
857	sprintf(args, "rlogin -l %s %s",
858	ptr, inet_ntoa(so->so_faddr));
859	} else if (n == 3) {
860	i2 = so_rcv->sb_wptr - ptr;
861	for (i = 0; i < i2; i++) {
862	if (ptr[i] == '/') {
863	ptr[i] = 0;
864	#ifdef HAVE_SETENV
865	sprintf(term, "%s", ptr);
866	#else
867	sprintf(term, "TERM=%s", ptr);
868	#endif
869	ptr[i] = '/';
870	break;
871	}
872	}
873	}
874	}
875	}
876
877	if (n != 4)
878	return 0;
879
880	/* We have it, set our term variable and fork_exec() */
881	#ifdef HAVE_SETENV
882	setenv("TERM", term, 1);
883	#else
884	putenv(term);
885	#endif
886	fork_exec(so, args, 2);
887	term[0] = 0;
888	so->so_emu = 0;
889
890	/* And finally, send the client a 0 character */
891	so_snd->sb_wptr[0] = 0;
892	so_snd->sb_wptr++;
893	so_snd->sb_cc++;
894
895	return 0;
896	}
897
898	case EMU_RSH:
899	/*
900	* rsh emulation
901	* First we accumulate all the initial option negotiation,
902	* then rsh_exec() rsh according to the options
903	*/
904	{
905	int n;
906	char *ptr;
907	char *user;
908	char *args;
909	struct sbuf *so_snd = &so->so_snd;
910	struct sbuf *so_rcv = &so->so_rcv;
911
912	/* First check if they have a priveladged port, or too much data has arrived */
913	if (ntohs(so->so_lport) > 1023 \|\| ntohs(so->so_lport) < 512 \|\|
914	(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
915	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
916	so_snd->sb_wptr += 18;
917	so_snd->sb_cc += 18;
918	tcp_sockclosed(sototcpcb(so));
919	m_free(m);
920	return 0;
921	}
922
923	/* Append the current data */
924	memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
925	so_rcv->sb_wptr += m->m_len;
926	so_rcv->sb_rptr += m->m_len;
927	m_free(m);
928
929	/*
930	* Check if we have all the initial options,
931	* and build argument list to rlogin while we're here
932	*/
933	n = 0;
934	ptr = so_rcv->sb_data;
935	user="";
936	args="";
937	if (so->extra==NULL) {
938	struct socket *ns;
939	struct tcpcb* tp;
940	int port=atoi(ptr);
941	if (port <= 0) return 0;
942	if (port > 1023 \|\| port < 512) {
943	memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
944	so_snd->sb_wptr += 18;
945	so_snd->sb_cc += 18;
946	tcp_sockclosed(sototcpcb(so));
947	return 0;
948	}
949	if ((ns=socreate()) == NULL)
950	return 0;
951	if (tcp_attach(ns)<0) {
952	free(ns);
953	return 0;
954	}
955
956	ns->so_laddr=so->so_laddr;
957	ns->so_lport=htons(port);
958
959	(void) tcp_mss(sototcpcb(ns), 0);
960
961	ns->so_faddr=so->so_faddr;
962	ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
963
964	if (ns->so_faddr.s_addr == 0 \|\|
965	ns->so_faddr.s_addr == loopback_addr.s_addr)
966	ns->so_faddr = alias_addr;
967
968	ns->so_iptos = tcp_tos(ns);
969	tp = sototcpcb(ns);
970
971	tcp_template(tp);
972
973	/* Compute window scaling to request. */
974	/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
975	* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
976	* tp->request_r_scale++;
977	*/
978
979	/soisfconnecting(ns);/
980
981	tcpstat.tcps_connattempt++;
982
983	tp->t_state = TCPS_SYN_SENT;
984	tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
985	tp->iss = tcp_iss;
986	tcp_iss += TCP_ISSINCR/2;
987	tcp_sendseqinit(tp);
988	tcp_output(tp);
989	so->extra=ns;
990	}
991	while (ptr < so_rcv->sb_wptr) {
992	if (*ptr++ == 0) {
993	n++;
994	if (n == 2) {
995	user=ptr;
996	} else if (n == 3) {
997	args=ptr;
998	}
999	}
1000	}
1001
1002	if (n != 4)
1003	return 0;
1004
1005	rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
1006	so->so_emu = 0;
1007	so->extra=NULL;
1008
1009	/* And finally, send the client a 0 character */
1010	so_snd->sb_wptr[0] = 0;
1011	so_snd->sb_wptr++;
1012	so_snd->sb_cc++;
1013
1014	return 0;
1015	}
1016
1017	case EMU_CTL:
1018	{
1019	int num;
1020	struct sbuf *so_snd = &so->so_snd;
1021	struct sbuf *so_rcv = &so->so_rcv;
1022
1023	/*
1024	* If there is binary data here, we save it in so->so_m
1025	*/
1026	if (!so->so_m) {
1027	int rxlen;
1028	char *rxdata;
1029	rxdata=mtod(m, char *);
1030	for (rxlen=m->m_len; rxlen; rxlen--) {
1031	if (*rxdata++ & 0x80) {
1032	so->so_m = m;
1033	return 0;
1034	}
1035	}
1036	} /* if(so->so_m==NULL) */
1037
1038	/*
1039	* Append the line
1040	*/
1041	sbappendsb(so_rcv, m);
1042
1043	/* To avoid going over the edge of the buffer, we reset it */
1044	if (so_snd->sb_cc == 0)
1045	so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
1046
1047	/*
1048	* A bit of a hack:
1049	* If the first packet we get here is 1 byte long, then it
1050	* was done in telnet character mode, therefore we must echo
1051	* the characters as they come. Otherwise, we echo nothing,
1052	* because in linemode, the line is already echoed
1053	* XXX two or more control connections won't work
1054	*/
1055	if (do_echo == -1) {
1056	if (m->m_len == 1) do_echo = 1;
1057	else do_echo = 0;
1058	}
1059	if (do_echo) {
1060	sbappendsb(so_snd, m);
1061	m_free(m);
1062	tcp_output(sototcpcb(so)); /* XXX */
1063	} else
1064	m_free(m);
1065
1066	num = 0;
1067	while (num < so->so_rcv.sb_cc) {
1068	if (*(so->so_rcv.sb_rptr + num) == '\n' \|\|
1069	*(so->so_rcv.sb_rptr + num) == '\r') {
1070	int n;
1071
1072	*(so_rcv->sb_rptr + num) = 0;
1073	if (ctl_password && !ctl_password_ok) {
1074	/* Need a password */
1075	if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
1076	if (strcmp(buff, ctl_password) == 0) {
1077	ctl_password_ok = 1;
1078	n = sprintf(so_snd->sb_wptr,
1079	"Password OK.\r\n");
1080	goto do_prompt;
1081	}
1082	}
1083	n = sprintf(so_snd->sb_wptr,
1084	"Error: Password required, log on with \"pass PASSWORD\"\r\n");
1085	goto do_prompt;
1086	}
1087	cfg_quitting = 0;
1088	n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
1089	if (!cfg_quitting) {
1090	/* Register the printed data */
1091	do_prompt:
1092	so_snd->sb_cc += n;
1093	so_snd->sb_wptr += n;
1094	/* Add prompt */
1095	n = sprintf(so_snd->sb_wptr, "Slirp> ");
1096	so_snd->sb_cc += n;
1097	so_snd->sb_wptr += n;
1098	}
1099	/* Drop so_rcv data */
1100	so_rcv->sb_cc = 0;
1101	so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
1102	tcp_output(sototcpcb(so)); /* Send the reply */
1103	}
1104	num++;
1105	}
1106	return 0;
1107	}
1108	#endif
1109	case EMU_FTP: /* ftp */
1110	(m->m_data+m->m_len) = 0; / NULL terminate for strstr */
1111	if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
1112	/*
1113	* Need to emulate the PORT command
1114	*/
1115	#ifdef VBOX
1116	x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
1117	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1118	#else
1119	x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
1120	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1121	#endif
1122	if (x < 6)
1123	return 1;
1124
1125	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1126	lport = htons((n5 << 8) \| (n6));
1127
1128	#ifdef VBOX
1129	if ((so = solisten(pData, 0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1130	#else /* !VBOX */
1131	if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1132	#endif /* !VBOX */
1133	return 1;
1134
1135	n6 = ntohs(so->so_fport);
1136
1137	n5 = (n6 >> 8) & 0xff;
1138	n6 &= 0xff;
1139
1140	laddr = ntohl(so->so_faddr.s_addr);
1141
1142	n1 = ((laddr >> 24) & 0xff);
1143	n2 = ((laddr >> 16) & 0xff);
1144	n3 = ((laddr >> 8) & 0xff);
1145	n4 = (laddr & 0xff);
1146
1147	m->m_len = bptr - m->m_data; /* Adjust length */
1148	m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
1149	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1150	return 1;
1151	} else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
1152	/*
1153	* Need to emulate the PASV response
1154	*/
1155	#ifdef VBOX
1156	x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
1157	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1158	#else
1159	x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
1160	&n1, &n2, &n3, &n4, &n5, &n6, buff);
1161	#endif
1162	if (x < 6)
1163	return 1;
1164
1165	laddr = htonl((n1 << 24) \| (n2 << 16) \| (n3 << 8) \| (n4));
1166	lport = htons((n5 << 8) \| (n6));
1167
1168	#ifdef VBOX
1169	if ((so = solisten(pData, 0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1170	#else /* !VBOX */
1171	if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1172	#endif /* !VBOX */
1173	return 1;
1174
1175	n6 = ntohs(so->so_fport);
1176
1177	n5 = (n6 >> 8) & 0xff;
1178	n6 &= 0xff;
1179
1180	laddr = ntohl(so->so_faddr.s_addr);
1181
1182	n1 = ((laddr >> 24) & 0xff);
1183	n2 = ((laddr >> 16) & 0xff);
1184	n3 = ((laddr >> 8) & 0xff);
1185	n4 = (laddr & 0xff);
1186
1187	m->m_len = bptr - m->m_data; /* Adjust length */
1188	m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1189	n1, n2, n3, n4, n5, n6, x==7?buff:"");
1190
1191	return 1;
1192	}
1193
1194	return 1;
1195
1196	case EMU_KSH:
1197	/*
1198	* The kshell (Kerberos rsh) and shell services both pass
1199	* a local port port number to carry signals to the server
1200	* and stderr to the client. It is passed at the beginning
1201	* of the connection as a NUL-terminated decimal ASCII string.
1202	*/
1203	so->so_emu = 0;
1204	for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1205	if (m->m_data[i] < '0' \|\| m->m_data[i] > '9')
1206	return 1; /* invalid number */
1207	lport *= 10;
1208	lport += m->m_data[i] - '0';
1209	}
1210	if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1211	#ifdef VBOX
1212	(so = solisten(pData, 0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1213	#else /* !VBOX */
1214	(so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1215	#endif /* !VBOX */
1216	m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
1217	return 1;
1218
1219	case EMU_IRC:
1220	/*
1221	* Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1222	*/
1223	(m->m_data+m->m_len) = 0; / NULL terminate the string for strstr */
1224	if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1225	return 1;
1226
1227	/* The %256s is for the broken mIRC */
1228	if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1229	#ifdef VBOX
1230	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1231	#else /* !VBOX */
1232	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1233	#endif /* !VBOX */
1234	return 1;
1235
1236	m->m_len = bptr - m->m_data; /* Adjust length */
1237	m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
1238	(unsigned long)ntohl(so->so_faddr.s_addr),
1239	ntohs(so->so_fport), 1);
1240	} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1241	#ifdef VBOX
1242	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1243	#else /* !VBOX */
1244	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1245	#endif /* !VBOX */
1246	return 1;
1247
1248	m->m_len = bptr - m->m_data; /* Adjust length */
1249	m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
1250	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1251	ntohs(so->so_fport), n1, 1);
1252	} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1253	#ifdef VBOX
1254	if ((so = solisten(pData, 0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1255	#else /* !VBOX */
1256	if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1257	#endif /* !VBOX */
1258	return 1;
1259
1260	m->m_len = bptr - m->m_data; /* Adjust length */
1261	m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
1262	buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1263	ntohs(so->so_fport), n1, 1);
1264	}
1265	return 1;
1266
1267	#ifdef VBOX
1268	/** @todo Disabled EMU_REALAUDIO, because it uses a static variable.
1269	* This is not legal when more than one slirp instance is active. */
1270	#else /* !VBOX */
1271	case EMU_REALAUDIO:
1272	/*
1273	* RealAudio emulation - JP. We must try to parse the incoming
1274	* data and try to find the two characters that contain the
1275	* port number. Then we redirect an udp port and replace the
1276	* number with the real port we got.
1277	*
1278	* The 1.0 beta versions of the player are not supported
1279	* any more.
1280	*
1281	* A typical packet for player version 1.0 (release version):
1282	*
1283	* 0000:50 4E 41 00 05
1284	* 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....×..gælÜc..P
1285	* 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1286	* 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1287	* 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1288	*
1289	* Now the port number 0x1BD7 is found at offset 0x04 of the
1290	* Now the port number 0x1BD7 is found at offset 0x04 of the
1291	* second packet. This time we received five bytes first and
1292	* then the rest. You never know how many bytes you get.
1293	*
1294	* A typical packet for player version 2.0 (beta):
1295	*
1296	* 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........Á.
1297	* 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..Win2.0.0
1298	* 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1299	* 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1300	* 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1301	*
1302	* Port number 0x1BC1 is found at offset 0x0d.
1303	*
1304	* This is just a horrible switch statement. Variable ra tells
1305	* us where we're going.
1306	*/
1307
1308	bptr = m->m_data;
1309	while (bptr < m->m_data + m->m_len) {
1310	u_short p;
1311	static int ra = 0;
1312	char ra_tbl[4];
1313
1314	ra_tbl[0] = 0x50;
1315	ra_tbl[1] = 0x4e;
1316	ra_tbl[2] = 0x41;
1317	ra_tbl[3] = 0;
1318
1319	switch (ra) {
1320	case 0:
1321	case 2:
1322	case 3:
1323	if (*bptr++ != ra_tbl[ra]) {
1324	ra = 0;
1325	continue;
1326	}
1327	break;
1328
1329	case 1:
1330	/*
1331	* We may get 0x50 several times, ignore them
1332	*/
1333	if (*bptr == 0x50) {
1334	ra = 1;
1335	bptr++;
1336	continue;
1337	} else if (*bptr++ != ra_tbl[ra]) {
1338	ra = 0;
1339	continue;
1340	}
1341	break;
1342
1343	case 4:
1344	/*
1345	* skip version number
1346	*/
1347	bptr++;
1348	break;
1349
1350	case 5:
1351	/*
1352	* The difference between versions 1.0 and
1353	* 2.0 is here. For future versions of
1354	* the player this may need to be modified.
1355	*/
1356	if (*(bptr + 1) == 0x02)
1357	bptr += 8;
1358	else
1359	bptr += 4;
1360	break;
1361
1362	case 6:
1363	/* This is the field containing the port
1364	* number that RA-player is listening to.
1365	*/
1366	lport = (((u_char*)bptr)[0] << 8)
1367	+ ((u_char *)bptr)[1];
1368	if (lport < 6970)
1369	lport += 256; /* don't know why */
1370	if (lport < 6970 \|\| lport > 7170)
1371	return 1; /* failed */
1372
1373	/* try to get udp port between 6970 - 7170 */
1374	for (p = 6970; p < 7071; p++) {
1375	if (udp_listen( htons(p),
1376	so->so_laddr.s_addr,
1377	htons(lport),
1378	SS_FACCEPTONCE)) {
1379	break;
1380	}
1381	}
1382	if (p == 7071)
1383	p = 0;
1384	(u_char )bptr++ = (p >> 8) & 0xff;
1385	(u_char )bptr++ = p & 0xff;
1386	ra = 0;
1387	return 1; /* port redirected, we're done */
1388	break;
1389
1390	default:
1391	ra = 0;
1392	}
1393	ra++;
1394	}
1395	return 1;
1396	#endif /* !VBOX */
1397
1398	default:
1399	/* Ooops, not emulated, won't call tcp_emu again */
1400	so->so_emu = 0;
1401	return 1;
1402	}
1403	}
1404
1405	/*
1406	* Do misc. config of SLiRP while its running.
1407	* Return 0 if this connections is to be closed, 1 otherwise,
1408	* return 2 if this is a command-line connection
1409	*/
1410	int
1411	#ifdef VBOX
1412	tcp_ctl(PNATState pData, struct socket *so)
1413	#else /* !VBOX */
1414	tcp_ctl(so)
1415	struct socket *so;
1416	#endif /* !VBOX */
1417	{
1418	struct sbuf *sb = &so->so_snd;
1419	int command;
1420	struct ex_list *ex_ptr;
1421	int do_pty;
1422	/* struct socket tmpso; /
1423
1424	DEBUG_CALL("tcp_ctl");
1425	DEBUG_ARG("so = %lx", (long )so);
1426
1427	#if 0
1428	/*
1429	* Check if they're authorised
1430	*/
1431	if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 \|\| (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1432	sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1433	sb->sb_wptr += sb->sb_cc;
1434	return 0;
1435	}
1436	#endif
1437	command = (ntohl(so->so_faddr.s_addr) & 0xff);
1438
1439	switch(command) {
1440	default: /* Check for exec's */
1441
1442	/*
1443	* Check if it's pty_exec
1444	*/
1445	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1446	if (ex_ptr->ex_fport == so->so_fport &&
1447	command == ex_ptr->ex_addr) {
1448	do_pty = ex_ptr->ex_pty;
1449	goto do_exec;
1450	}
1451	}
1452
1453	/*
1454	* Nothing bound..
1455	*/
1456	/* tcp_fconnect(so); */
1457
1458	/* FALLTHROUGH */
1459	case CTL_ALIAS:
1460	sb->sb_cc = sprintf(sb->sb_wptr,
1461	"Error: No application configured.\r\n");
1462	sb->sb_wptr += sb->sb_cc;
1463	return(0);
1464
1465	do_exec:
1466	DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1467	#ifdef VBOX
1468	return(fork_exec(pData, so, ex_ptr->ex_exec, do_pty));
1469	#else /* !VBOX */
1470	return(fork_exec(so, ex_ptr->ex_exec, do_pty));
1471	#endif /* !VBOX */
1472
1473	#if 0
1474	case CTL_CMD:
1475	for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1476	if (tmpso->so_emu == EMU_CTL &&
1477	!(tmpso->so_tcpcb?
1478	(tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT\|TCPS_LAST_ACK))
1479	:0)) {
1480	/* Ooops, control connection already active */
1481	sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1482	sb->sb_wptr += sb->sb_cc;
1483	return 0;
1484	}
1485	}
1486	so->so_emu = EMU_CTL;
1487	ctl_password_ok = 0;
1488	sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1489	sb->sb_wptr += sb->sb_cc;
1490	do_echo=-1;
1491	return(2);
1492	#endif
1493	}
1494	}
1495
1496	#if defined(VBOX) && SIZEOF_CHAR_P != 4
1497	/**
1498	* Slow pointer hashing that deals with automatic inserting and collisions.
1499	*/
1500	uint32_t VBoxU32PtrHashSlow(PNATState pData, void *pv)
1501	{
1502	uint32_t i;
1503	if (pv == NULL)
1504	i = 0;
1505	else
1506	{
1507	const uint32_t i1 = ((uintptr_t)pv >> 3) % RT_ELEMENTS(pData->apvHash);
1508	if (pData->apvHash[i1] == pv)
1509	i = i1;
1510	else
1511	{
1512	/*
1513	* Try up to 10 times then assume it's an insertion.
1514	* If we didn't find a free entry by then, try another 100 times.
1515	* If that fails, give up.
1516	*/
1517	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1518	uint32_t i1stFree = pData->apvHash[i1] ? 0 : i1;
1519	int cTries = 10;
1520	int cTries2 = 100;
1521
1522	i = i1;
1523	for (;;)
1524	{
1525	/* check if we should give in.*/
1526	if (--cTries > 0)
1527	{
1528	if (i1stFree != 0)
1529	{
1530	i = i1stFree;
1531	pData->apvHash[i] = pv;
1532	pData->cpvHashUsed++;
1533	if (i != i1)
1534	pData->cpvHashCollisions++;
1535	pData->cpvHashInserts++;
1536	break;
1537	}
1538	if (!cTries2)
1539	{
1540	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p cpvHashUsed=%d cpvHashCollisions=%u\n",
1541	pv, pData->cpvHashUsed, pData->cpvHashCollisions));
1542	i = 0;
1543	break;
1544	}
1545	cTries = cTries2;
1546	cTries2 = 0;
1547	}
1548
1549	/* advance to the next hash entry and test it. */
1550	i = (i + i2) % RT_ELEMENTS(pData->apvHash);
1551	while (RT_UNLIKELY(!i))
1552	i = (i + i2) % RT_ELEMENTS(pData->apvHash);
1553	if (pData->apvHash[i] == pv)
1554	break;
1555	if (RT_UNLIKELY(!i1stFree && !pData->apvHash[i]))
1556	i1stFree = i;
1557	}
1558	}
1559	}
1560	return i;
1561	}
1562
1563
1564	/**
1565	* Removes the pointer from the hash table.
1566	*/
1567	void VBoxU32PtrDone(PNATState pData, void *pv, uint32_t iHint)
1568	{
1569	/* We don't count NULL pointers. */
1570	if (pv == NULL)
1571	return;
1572	pData->cpvHashDone++;
1573
1574	/* try the hint */
1575	if ( iHint
1576	&& iHint < RT_ELEMENTS(pData->apvHash)
1577	&& pData->apvHash[iHint] == pv)
1578	{
1579	pData->apvHash[iHint] = NULL;
1580	pData->cpvHashUsed--;
1581	return;
1582	}
1583
1584	iHint = ((uintptr_t)pv >> 3) % RT_ELEMENTS(pData->apvHash);
1585	if (RT_UNLIKELY(pData->apvHash[iHint] != pv))
1586	{
1587	/*
1588	* Try up to 120 times then assert.
1589	*/
1590	const uint32_t i2 = ((uintptr_t)pv >> 2) % 7867;
1591	int cTries = 120;
1592	for (;;)
1593	{
1594	/* advance to the next hash entry and test it. */
1595	iHint = (iHint + i2) % RT_ELEMENTS(pData->apvHash);
1596	while (RT_UNLIKELY(!iHint))
1597	iHint = (iHint + i2) % RT_ELEMENTS(pData->apvHash);
1598	if (pData->apvHash[iHint] == pv)
1599	break;
1600
1601	/* check if we should give in.*/
1602	if (--cTries > 0)
1603	{
1604	AssertReleaseMsgFailed(("NAT pointer hash error. pv=%p cpvHashUsed=%u cpvHashCollisions=%u\n",
1605	pv, pData->cpvHashUsed, pData->cpvHashCollisions));
1606	return;
1607	}
1608	}
1609	}
1610
1611	/* found it */
1612	pData->apvHash[iHint] = NULL;
1613	pData->cpvHashUsed--;
1614	}
1615
1616	#endif

注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

source: vbox/trunk/src/VBox/Devices/Network/slirp/tcp_subr.c@ 1052

以其他格式下載: