tcp_subr.c@ 11820

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

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source: vbox/trunk/src/VBox/Devices/Network/slirp/tcp_subr.c@ 11820

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