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added some comments in wirefilter
[vde.git] / vde-2 / slirpvde / tcp_subr.c
blob516eb4592f3a41329808fcd80c722a4ca58bef1c
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 <config.h>
47 #include <slirp.h>
48
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
56 /*
57 * Tcp initialization
58 */
59 void
60 tcp_init()
61 {
62 tcp_iss = 1; /* wrong */
63 tcb.so_next = tcb.so_prev = &tcb;
64
65 /* tcp_rcvspace = our Window we advertise to the remote */
66 tcp_rcvspace = TCP_RCVSPACE;
67 tcp_sndspace = TCP_SNDSPACE;
68
69 /* Make sure tcp_sndspace is at least 2*MSS */
70 if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
71 tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
72 }
73
74 /*
75 * Create template to be used to send tcp packets on a connection.
76 * Call after host entry created, fills
77 * in a skeletal tcp/ip header, minimizing the amount of work
78 * necessary when the connection is used.
79 */
80 /* struct tcpiphdr * */
81 void
82 tcp_template(tp)
83 struct tcpcb *tp;
84 {
85 struct socket *so = tp->t_socket;
86 register struct tcpiphdr *n = &tp->t_template;
87
88 n->ti_next = n->ti_prev = 0;
89 n->ti_x1 = 0;
90 n->ti_pr = IPPROTO_TCP;
91 n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
92 n->ti_src = so->so_faddr;
93 n->ti_dst = so->so_laddr;
94 n->ti_sport = so->so_fport;
95 n->ti_dport = so->so_lport;
96
97 n->ti_seq = 0;
98 n->ti_ack = 0;
99 n->ti_x2 = 0;
100 n->ti_off = 5;
101 n->ti_flags = 0;
102 n->ti_win = 0;
103 n->ti_sum = 0;
104 n->ti_urp = 0;
105 }
106
107 /*
108 * Send a single message to the TCP at address specified by
109 * the given TCP/IP header. If m == 0, then we make a copy
110 * of the tcpiphdr at ti and send directly to the addressed host.
111 * This is used to force keep alive messages out using the TCP
112 * template for a connection tp->t_template. If flags are given
113 * then we send a message back to the TCP which originated the
114 * segment ti, and discard the mbuf containing it and any other
115 * attached mbufs.
116 *
117 * In any case the ack and sequence number of the transmitted
118 * segment are as specified by the parameters.
119 */
120 void
121 tcp_respond(tp, ti, m, ack, seq, flags)
122 struct tcpcb *tp;
123 register struct tcpiphdr *ti;
124 register struct mbuf *m;
125 tcp_seq ack, seq;
126 int flags;
127 {
128 register int tlen;
129 int win = 0;
130
131 DEBUG_CALL("tcp_respond");
132 DEBUG_ARG("tp = %lx", (long)tp);
133 DEBUG_ARG("ti = %lx", (long)ti);
134 DEBUG_ARG("m = %lx", (long)m);
135 DEBUG_ARG("ack = %u", ack);
136 DEBUG_ARG("seq = %u", seq);
137 DEBUG_ARG("flags = %x", flags);
138
139 if (tp)
140 win = sbspace(&tp->t_socket->so_rcv);
141 if (m == 0) {
142 if ((m = m_get()) == NULL)
143 return;
144 #ifdef TCP_COMPAT_42
145 tlen = 1;
146 #else
147 tlen = 0;
148 #endif
149 m->m_data += if_maxlinkhdr;
150 *mtod(m, struct tcpiphdr *) = *ti;
151 ti = mtod(m, struct tcpiphdr *);
152 flags = TH_ACK;
153 } else {
154 /*
155 * ti points into m so the next line is just making
156 * the mbuf point to ti
157 */
158 m->m_data = (caddr_t)ti;
159
160 m->m_len = sizeof (struct tcpiphdr);
161 tlen = 0;
162 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
163 xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
164 xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
165 #undef xchg
166 }
167 ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
168 tlen += sizeof (struct tcpiphdr);
169 m->m_len = tlen;
170
171 ti->ti_next = ti->ti_prev = 0;
172 ti->ti_x1 = 0;
173 ti->ti_seq = htonl(seq);
174 ti->ti_ack = htonl(ack);
175 ti->ti_x2 = 0;
176 ti->ti_off = sizeof (struct tcphdr) >> 2;
177 ti->ti_flags = flags;
178 if (tp)
179 ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
180 else
181 ti->ti_win = htons((u_int16_t)win);
182 ti->ti_urp = 0;
183 ti->ti_sum = 0;
184 ti->ti_sum = cksum(m, tlen);
185 ((struct ip *)ti)->ip_len = tlen;
186
187 if(flags & TH_RST)
188 ((struct ip *)ti)->ip_ttl = MAXTTL;
189 else
190 ((struct ip *)ti)->ip_ttl = ip_defttl;
191
192 (void) ip_output((struct socket *)0, m);
193 }
194
195 /*
196 * Create a new TCP control block, making an
197 * empty reassembly queue and hooking it to the argument
198 * protocol control block.
199 */
200 struct tcpcb *
201 tcp_newtcpcb(so)
202 struct socket *so;
203 {
204 register struct tcpcb *tp;
205
206 tp = (struct tcpcb *)malloc(sizeof(*tp));
207 if (tp == NULL)
208 return ((struct tcpcb *)0);
209
210 memset((char *) tp, 0, sizeof(struct tcpcb));
211 tp->seg_next = tp->seg_prev = (tcpiphdrp_32)tp;
212 tp->t_maxseg = tcp_mssdflt;
213
214 tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
215 tp->t_socket = so;
216
217 /*
218 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
219 * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
220 * reasonable initial retransmit time.
221 */
222 tp->t_srtt = TCPTV_SRTTBASE;
223 tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
224 tp->t_rttmin = TCPTV_MIN;
225
226 TCPT_RANGESET(tp->t_rxtcur,
227 ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
228 TCPTV_MIN, TCPTV_REXMTMAX);
229
230 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
231 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
232 tp->t_state = TCPS_CLOSED;
233
234 so->so_tcpcb = tp;
235
236 return (tp);
237 }
238
239 /*
240 * Drop a TCP connection, reporting
241 * the specified error. If connection is synchronized,
242 * then send a RST to peer.
243 */
244 struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
245 {
246 /* tcp_drop(tp, errno)
247 register struct tcpcb *tp;
248 int errno;
249 {
250 */
251
252 DEBUG_CALL("tcp_drop");
253 DEBUG_ARG("tp = %lx", (long)tp);
254 DEBUG_ARG("errno = %d", errno);
255
256 if (TCPS_HAVERCVDSYN(tp->t_state)) {
257 tp->t_state = TCPS_CLOSED;
258 (void) tcp_output(tp);
259 tcpstat.tcps_drops++;
260 } else
261 tcpstat.tcps_conndrops++;
262 /* if (errno == ETIMEDOUT && tp->t_softerror)
263 * errno = tp->t_softerror;
264 */
265 /* so->so_error = errno; */
266 return (tcp_close(tp));
267 }
268
269 /*
270 * Close a TCP control block:
271 * discard all space held by the tcp
272 * discard internet protocol block
273 * wake up any sleepers
274 */
275 struct tcpcb *
276 tcp_close(tp)
277 register struct tcpcb *tp;
278 {
279 register struct tcpiphdr *t;
280 struct socket *so = tp->t_socket;
281 register struct mbuf *m;
282
283 DEBUG_CALL("tcp_close");
284 DEBUG_ARG("tp = %lx", (long )tp);
285
286 /* free the reassembly queue, if any */
287 t = (struct tcpiphdr *) tp->seg_next;
288 while (t != (struct tcpiphdr *)tp) {
289 t = (struct tcpiphdr *)t->ti_next;
290 m = (struct mbuf *) REASS_MBUF((struct tcpiphdr *)t->ti_prev);
291 remque_32((struct tcpiphdr *) t->ti_prev);
292 m_freem(m);
293 }
294 /* It's static */
295 /* if (tp->t_template)
296 * (void) m_free(dtom(tp->t_template));
297 */
298 /* free(tp, M_PCB); */
299 free(tp);
300 so->so_tcpcb = 0;
301 soisfdisconnected(so);
302 /* clobber input socket cache if we're closing the cached connection */
303 if (so == tcp_last_so)
304 tcp_last_so = &tcb;
305 close(so->s);
306 sbfree(&so->so_rcv);
307 sbfree(&so->so_snd);
308 sofree(so);
309 tcpstat.tcps_closed++;
310 return ((struct tcpcb *)0);
311 }
312
313 void
314 tcp_drain()
315 {
316 /* XXX */
317 }
318
319 /*
320 * When a source quench is received, close congestion window
321 * to one segment. We will gradually open it again as we proceed.
322 */
323
324 #ifdef notdef
325
326 void
327 tcp_quench(i, errno)
328
329 int errno;
330 {
331 struct tcpcb *tp = intotcpcb(inp);
332
333 if (tp)
334 tp->snd_cwnd = tp->t_maxseg;
335 }
336
337 #endif /* notdef */
338
339 /*
340 * TCP protocol interface to socket abstraction.
341 */
342
343 /*
344 * User issued close, and wish to trail through shutdown states:
345 * if never received SYN, just forget it. If got a SYN from peer,
346 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
347 * If already got a FIN from peer, then almost done; go to LAST_ACK
348 * state. In all other cases, have already sent FIN to peer (e.g.
349 * after PRU_SHUTDOWN), and just have to play tedious game waiting
350 * for peer to send FIN or not respond to keep-alives, etc.
351 * We can let the user exit from the close as soon as the FIN is acked.
352 */
353 void
354 tcp_sockclosed(tp)
355 struct tcpcb *tp;
356 {
357
358 DEBUG_CALL("tcp_sockclosed");
359 DEBUG_ARG("tp = %lx", (long)tp);
360
361 switch (tp->t_state) {
362
363 case TCPS_CLOSED:
364 case TCPS_LISTEN:
365 case TCPS_SYN_SENT:
366 tp->t_state = TCPS_CLOSED;
367 tp = tcp_close(tp);
368 break;
369
370 case TCPS_SYN_RECEIVED:
371 case TCPS_ESTABLISHED:
372 tp->t_state = TCPS_FIN_WAIT_1;
373 break;
374
375 case TCPS_CLOSE_WAIT:
376 tp->t_state = TCPS_LAST_ACK;
377 break;
378 }
379 /* soisfdisconnecting(tp->t_socket); */
380 if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
381 soisfdisconnected(tp->t_socket);
382 if (tp)
383 tcp_output(tp);
384 }
385
386 /*
387 * Connect to a host on the Internet
388 * Called by tcp_input
389 * Only do a connect, the tcp fields will be set in tcp_input
390 * return 0 if there's a result of the connect,
391 * else return -1 means we're still connecting
392 * The return value is almost always -1 since the socket is
393 * nonblocking. Connect returns after the SYN is sent, and does
394 * not wait for ACK+SYN.
395 */
396 int tcp_fconnect(so)
397 struct socket *so;
398 {
399 int ret=0;
400
401 DEBUG_CALL("tcp_fconnect");
402 DEBUG_ARG("so = %lx", (long )so);
403
404 if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
405 int opt, s=so->s;
406 struct sockaddr_in addr;
407
408 fd_nonblock(s);
409 opt = 1;
410 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
411 opt = 1;
412 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
413
414 addr.sin_family = AF_INET;
415 if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
416 /* It's an alias */
417 switch(ntohl(so->so_faddr.s_addr) & 0xff) {
418 case CTL_DNS:
419 addr.sin_addr = dns_addr;
420 break;
421 case CTL_ALIAS:
422 default:
423 addr.sin_addr = loopback_addr;
424 break;
425 }
426 } else
427 addr.sin_addr = so->so_faddr;
428 addr.sin_port = so->so_fport;
429
430 DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
431 "addr.sin_addr.s_addr=%.16s\n",
432 ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
433 /* We don't care what port we get */
434 ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
435
436 /*
437 * If it's not in progress, it failed, so we just return 0,
438 * without clearing SS_NOFDREF
439 */
440 soisfconnecting(so);
441 }
442
443 return(ret);
444 }
445
446 /*
447 * Accept the socket and connect to the local-host
448 *
449 * We have a problem. The correct thing to do would be
450 * to first connect to the local-host, and only if the
451 * connection is accepted, then do an accept() here.
452 * But, a) we need to know who's trying to connect
453 * to the socket to be able to SYN the local-host, and
454 * b) we are already connected to the foreign host by
455 * the time it gets to accept(), so... We simply accept
456 * here and SYN the local-host.
457 */
458 void
459 tcp_connect(inso)
460 struct socket *inso;
461 {
462 struct socket *so;
463 struct sockaddr_in addr;
464 int addrlen = sizeof(struct sockaddr_in);
465 struct tcpcb *tp;
466 int s, opt;
467
468 DEBUG_CALL("tcp_connect");
469 DEBUG_ARG("inso = %lx", (long)inso);
470
471 /*
472 * If it's an SS_ACCEPTONCE socket, no need to socreate()
473 * another socket, just use the accept() socket.
474 */
475 if (inso->so_state & SS_FACCEPTONCE) {
476 /* FACCEPTONCE already have a tcpcb */
477 so = inso;
478 } else {
479 if ((so = socreate()) == NULL) {
480 /* If it failed, get rid of the pending connection */
481 close(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
482 return;
483 }
484 if (tcp_attach(so) < 0) {
485 free(so); /* NOT sofree */
486 return;
487 }
488 so->so_laddr = inso->so_laddr;
489 so->so_lport = inso->so_lport;
490 }
491
492 (void) tcp_mss(sototcpcb(so), 0);
493
494 if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
495 tcp_close(sototcpcb(so)); /* This will sofree() as well */
496 return;
497 }
498 fd_nonblock(s);
499 opt = 1;
500 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
501 opt = 1;
502 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
503
504 so->so_fport = addr.sin_port;
505 so->so_faddr = addr.sin_addr;
506 /* Translate connections from localhost to the real hostname */
507 if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr)
508 so->so_faddr = our_addr;
509
510 /* Close the accept() socket, set right state */
511 if (inso->so_state & SS_FACCEPTONCE) {
512 close(so->s); /* If we only accept once, close the accept() socket */
513 so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
514 /* if it's not FACCEPTONCE, it's already NOFDREF */
515 }
516 so->s = s;
517
518 so->so_iptos = tcp_tos(so);
519 tp = sototcpcb(so);
520
521 tcp_template(tp);
522
523 /* Compute window scaling to request. */
524 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
525 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
526 * tp->request_r_scale++;
527 */
528
529 /* soisconnecting(so); */ /* NOFDREF used instead */
530 tcpstat.tcps_connattempt++;
531
532 tp->t_state = TCPS_SYN_SENT;
533 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
534 tp->iss = tcp_iss;
535 tcp_iss += TCP_ISSINCR/2;
536 tcp_sendseqinit(tp);
537 tcp_output(tp);
538 }
539
540 /*
541 * Attach a TCPCB to a socket.
542 */
543 int
544 tcp_attach(so)
545 struct socket *so;
546 {
547 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
548 return -1;
549
550 insque(so, &tcb);
551
552 return 0;
553 }
554
555 /*
556 * Set the socket's type of service field
557 */
558 struct tos_t tcptos[] = {
559 {0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
560 {21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
561 {0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
562 {0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
563 {0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT}, /* rlogin */
564 {0, 514, IPTOS_LOWDELAY, EMU_RSH|EMU_NOCONNECT}, /* shell */
565 {0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
566 {0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
567 {0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
568 {0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
569 {0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
570 {0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
571 {0, 0, 0, 0}
572 };
573
574 struct emu_t *tcpemu = 0;
575
576 /*
577 * Return TOS according to the above table
578 */
579 u_int8_t
580 tcp_tos(so)
581 struct socket *so;
582 {
583 int i = 0;
584 struct emu_t *emup;
585
586 while(tcptos[i].tos) {
587 if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
588 (tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
589 so->so_emu = tcptos[i].emu;
590 return tcptos[i].tos;
591 }
592 i++;
593 }
594
595 /* Nope, lets see if there's a user-added one */
596 for (emup = tcpemu; emup; emup = emup->next) {
597 if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
598 (emup->lport && (ntohs(so->so_lport) == emup->lport))) {
599 so->so_emu = emup->emu;
600 return emup->tos;
601 }
602 }
603
604 return 0;
605 }
606
607 int do_echo = -1;
608
609 /*
610 * Emulate programs that try and connect to us
611 * This includes ftp (the data connection is
612 * initiated by the server) and IRC (DCC CHAT and
613 * DCC SEND) for now
614 *
615 * NOTE: It's possible to crash SLiRP by sending it
616 * unstandard strings to emulate... if this is a problem,
617 * more checks are needed here
618 *
619 * XXX Assumes the whole command came in one packet
620 *
621 * XXX Some ftp clients will have their TOS set to
622 * LOWDELAY and so Nagel will kick in. Because of this,
623 * we'll get the first letter, followed by the rest, so
624 * we simply scan for ORT instead of PORT...
625 * DCC doesn't have this problem because there's other stuff
626 * in the packet before the DCC command.
627 *
628 * Return 1 if the mbuf m is still valid and should be
629 * sbappend()ed
630 *
631 * NOTE: if you return 0 you MUST m_free() the mbuf!
632 */
633 int
634 tcp_emu(so, m)
635 struct socket *so;
636 struct mbuf *m;
637 {
638 u_int n1, n2, n3, n4, n5, n6;
639 char buff[256];
640 u_int32_t laddr;
641 u_int lport;
642 char *bptr;
643
644 DEBUG_CALL("tcp_emu");
645 DEBUG_ARG("so = %lx", (long)so);
646 DEBUG_ARG("m = %lx", (long)m);
647
648 switch(so->so_emu) {
649 int x, i;
650
651 case EMU_IDENT:
652 /*
653 * Identification protocol as per rfc-1413
654 */
655
656 {
657 struct socket *tmpso;
658 struct sockaddr_in addr;
659 int addrlen = sizeof(struct sockaddr_in);
660 struct sbuf *so_rcv = &so->so_rcv;
661
662 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
663 so_rcv->sb_wptr += m->m_len;
664 so_rcv->sb_rptr += m->m_len;
665 m->m_data[m->m_len] = 0; /* NULL terminate */
666 if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
667 if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) {
668 HTONS(n1);
669 HTONS(n2);
670 /* n2 is the one on our host */
671 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
672 if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
673 tmpso->so_lport == n2 &&
674 tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
675 tmpso->so_fport == n1) {
676 if (getsockname(tmpso->s,
677 (struct sockaddr *)&addr, &addrlen) == 0)
678 n2 = ntohs(addr.sin_port);
679 break;
680 }
681 }
682 }
683 so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
684 so_rcv->sb_rptr = so_rcv->sb_data;
685 so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
686 }
687 m_free(m);
688 return 0;
689 }
690
691 #if 0
692 case EMU_RLOGIN:
693 /*
694 * Rlogin emulation
695 * First we accumulate all the initial option negotiation,
696 * then fork_exec() rlogin according to the options
697 */
698 {
699 int i, i2, n;
700 char *ptr;
701 char args[100];
702 char term[100];
703 struct sbuf *so_snd = &so->so_snd;
704 struct sbuf *so_rcv = &so->so_rcv;
705
706 /* First check if they have a priveladged port, or too much data has arrived */
707 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
708 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
709 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
710 so_snd->sb_wptr += 18;
711 so_snd->sb_cc += 18;
712 tcp_sockclosed(sototcpcb(so));
713 m_free(m);
714 return 0;
715 }
716
717 /* Append the current data */
718 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
719 so_rcv->sb_wptr += m->m_len;
720 so_rcv->sb_rptr += m->m_len;
721 m_free(m);
722
723 /*
724 * Check if we have all the initial options,
725 * and build argument list to rlogin while we're here
726 */
727 n = 0;
728 ptr = so_rcv->sb_data;
729 args[0] = 0;
730 term[0] = 0;
731 while (ptr < so_rcv->sb_wptr) {
732 if (*ptr++ == 0) {
733 n++;
734 if (n == 2) {
735 sprintf(args, "rlogin -l %s %s",
736 ptr, inet_ntoa(so->so_faddr));
737 } else if (n == 3) {
738 i2 = so_rcv->sb_wptr - ptr;
739 for (i = 0; i < i2; i++) {
740 if (ptr[i] == '/') {
741 ptr[i] = 0;
742 #ifdef HAVE_SETENV
743 sprintf(term, "%s", ptr);
744 #else
745 sprintf(term, "TERM=%s", ptr);
746 #endif
747 ptr[i] = '/';
748 break;
749 }
750 }
751 }
752 }
753 }
754
755 if (n != 4)
756 return 0;
757
758 /* We have it, set our term variable and fork_exec() */
759 #ifdef HAVE_SETENV
760 setenv("TERM", term, 1);
761 #else
762 putenv(term);
763 #endif
764 fork_exec(so, args, 2);
765 term[0] = 0;
766 so->so_emu = 0;
767
768 /* And finally, send the client a 0 character */
769 so_snd->sb_wptr[0] = 0;
770 so_snd->sb_wptr++;
771 so_snd->sb_cc++;
772
773 return 0;
774 }
775
776 case EMU_RSH:
777 /*
778 * rsh emulation
779 * First we accumulate all the initial option negotiation,
780 * then rsh_exec() rsh according to the options
781 */
782 {
783 int n;
784 char *ptr;
785 char *user;
786 char *args;
787 struct sbuf *so_snd = &so->so_snd;
788 struct sbuf *so_rcv = &so->so_rcv;
789
790 /* First check if they have a priveladged port, or too much data has arrived */
791 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
792 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
793 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
794 so_snd->sb_wptr += 18;
795 so_snd->sb_cc += 18;
796 tcp_sockclosed(sototcpcb(so));
797 m_free(m);
798 return 0;
799 }
800
801 /* Append the current data */
802 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
803 so_rcv->sb_wptr += m->m_len;
804 so_rcv->sb_rptr += m->m_len;
805 m_free(m);
806
807 /*
808 * Check if we have all the initial options,
809 * and build argument list to rlogin while we're here
810 */
811 n = 0;
812 ptr = so_rcv->sb_data;
813 user="";
814 args="";
815 if (so->extra==NULL) {
816 struct socket *ns;
817 struct tcpcb* tp;
818 int port=atoi(ptr);
819 if (port <= 0) return 0;
820 if (port > 1023 || port < 512) {
821 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
822 so_snd->sb_wptr += 18;
823 so_snd->sb_cc += 18;
824 tcp_sockclosed(sototcpcb(so));
825 return 0;
826 }
827 if ((ns=socreate()) == NULL)
828 return 0;
829 if (tcp_attach(ns)<0) {
830 free(ns);
831 return 0;
832 }
833
834 ns->so_laddr=so->so_laddr;
835 ns->so_lport=htons(port);
836
837 (void) tcp_mss(sototcpcb(ns), 0);
838
839 ns->so_faddr=so->so_faddr;
840 ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
841
842 if (ns->so_faddr.s_addr == 0 ||
843 ns->so_faddr.s_addr == loopback_addr.s_addr)
844 ns->so_faddr = our_addr;
845
846 ns->so_iptos = tcp_tos(ns);
847 tp = sototcpcb(ns);
848
849 tcp_template(tp);
850
851 /* Compute window scaling to request. */
852 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
853 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
854 * tp->request_r_scale++;
855 */
856
857 /*soisfconnecting(ns);*/
858
859 tcpstat.tcps_connattempt++;
860
861 tp->t_state = TCPS_SYN_SENT;
862 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
863 tp->iss = tcp_iss;
864 tcp_iss += TCP_ISSINCR/2;
865 tcp_sendseqinit(tp);
866 tcp_output(tp);
867 so->extra=ns;
868 }
869 while (ptr < so_rcv->sb_wptr) {
870 if (*ptr++ == 0) {
871 n++;
872 if (n == 2) {
873 user=ptr;
874 } else if (n == 3) {
875 args=ptr;
876 }
877 }
878 }
879
880 if (n != 4)
881 return 0;
882
883 rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
884 so->so_emu = 0;
885 so->extra=NULL;
886
887 /* And finally, send the client a 0 character */
888 so_snd->sb_wptr[0] = 0;
889 so_snd->sb_wptr++;
890 so_snd->sb_cc++;
891
892 return 0;
893 }
894
895 case EMU_CTL:
896 {
897 int num;
898 struct sbuf *so_snd = &so->so_snd;
899 struct sbuf *so_rcv = &so->so_rcv;
900
901 /*
902 * If there is binary data here, we save it in so->so_m
903 */
904 if (!so->so_m) {
905 int rxlen;
906 char *rxdata;
907 rxdata=mtod(m, char *);
908 for (rxlen=m->m_len; rxlen; rxlen--) {
909 if (*rxdata++ & 0x80) {
910 so->so_m = m;
911 return 0;
912 }
913 }
914 } /* if(so->so_m==NULL) */
915
916 /*
917 * Append the line
918 */
919 sbappendsb(so_rcv, m);
920
921 /* To avoid going over the edge of the buffer, we reset it */
922 if (so_snd->sb_cc == 0)
923 so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
924
925 /*
926 * A bit of a hack:
927 * If the first packet we get here is 1 byte long, then it
928 * was done in telnet character mode, therefore we must echo
929 * the characters as they come. Otherwise, we echo nothing,
930 * because in linemode, the line is already echoed
931 * XXX two or more control connections won't work
932 */
933 if (do_echo == -1) {
934 if (m->m_len == 1) do_echo = 1;
935 else do_echo = 0;
936 }
937 if (do_echo) {
938 sbappendsb(so_snd, m);
939 m_free(m);
940 tcp_output(sototcpcb(so)); /* XXX */
941 } else
942 m_free(m);
943
944 num = 0;
945 while (num < so->so_rcv.sb_cc) {
946 if (*(so->so_rcv.sb_rptr + num) == '\n' ||
947 *(so->so_rcv.sb_rptr + num) == '\r') {
948 int n;
949
950 *(so_rcv->sb_rptr + num) = 0;
951 if (ctl_password && !ctl_password_ok) {
952 /* Need a password */
953 if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
954 if (strcmp(buff, ctl_password) == 0) {
955 ctl_password_ok = 1;
956 n = sprintf(so_snd->sb_wptr,
957 "Password OK.\r\n");
958 goto do_prompt;
959 }
960 }
961 n = sprintf(so_snd->sb_wptr,
962 "Error: Password required, log on with \"pass PASSWORD\"\r\n");
963 goto do_prompt;
964 }
965 cfg_quitting = 0;
966 n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
967 if (!cfg_quitting) {
968 /* Register the printed data */
969 do_prompt:
970 so_snd->sb_cc += n;
971 so_snd->sb_wptr += n;
972 /* Add prompt */
973 n = sprintf(so_snd->sb_wptr, "Slirp> ");
974 so_snd->sb_cc += n;
975 so_snd->sb_wptr += n;
976 }
977 /* Drop so_rcv data */
978 so_rcv->sb_cc = 0;
979 so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
980 tcp_output(sototcpcb(so)); /* Send the reply */
981 }
982 num++;
983 }
984 return 0;
985 }
986 #endif
987 case EMU_FTP: /* ftp */
988 *(m->m_data+m->m_len) = 0; /* NULL terminate for strstr */
989 if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
990 /*
991 * Need to emulate the PORT command
992 */
993 x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
994 &n1, &n2, &n3, &n4, &n5, &n6, buff);
995 if (x < 6)
996 return 1;
997
998 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
999 lport = htons((n5 << 8) | (n6));
1000
1001 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1002 return 1;
1003
1004 n6 = ntohs(so->so_fport);
1005
1006 n5 = (n6 >> 8) & 0xff;
1007 n6 &= 0xff;
1008
1009 laddr = ntohl(so->so_faddr.s_addr);
1010
1011 n1 = ((laddr >> 24) & 0xff);
1012 n2 = ((laddr >> 16) & 0xff);
1013 n3 = ((laddr >> 8) & 0xff);
1014 n4 = (laddr & 0xff);
1015
1016 m->m_len = bptr - m->m_data; /* Adjust length */
1017 m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
1018 n1, n2, n3, n4, n5, n6, x==7?buff:"");
1019 return 1;
1020 } else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
1021 /*
1022 * Need to emulate the PASV response
1023 */
1024 x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
1025 &n1, &n2, &n3, &n4, &n5, &n6, buff);
1026 if (x < 6)
1027 return 1;
1028
1029 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
1030 lport = htons((n5 << 8) | (n6));
1031
1032 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1033 return 1;
1034
1035 n6 = ntohs(so->so_fport);
1036
1037 n5 = (n6 >> 8) & 0xff;
1038 n6 &= 0xff;
1039
1040 laddr = ntohl(so->so_faddr.s_addr);
1041
1042 n1 = ((laddr >> 24) & 0xff);
1043 n2 = ((laddr >> 16) & 0xff);
1044 n3 = ((laddr >> 8) & 0xff);
1045 n4 = (laddr & 0xff);
1046
1047 m->m_len = bptr - m->m_data; /* Adjust length */
1048 m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1049 n1, n2, n3, n4, n5, n6, x==7?buff:"");
1050
1051 return 1;
1052 }
1053
1054 return 1;
1055
1056 case EMU_KSH:
1057 /*
1058 * The kshell (Kerberos rsh) and shell services both pass
1059 * a local port port number to carry signals to the server
1060 * and stderr to the client. It is passed at the beginning
1061 * of the connection as a NUL-terminated decimal ASCII string.
1062 */
1063 so->so_emu = 0;
1064 for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1065 if (m->m_data[i] < '0' || m->m_data[i] > '9')
1066 return 1; /* invalid number */
1067 lport *= 10;
1068 lport += m->m_data[i] - '0';
1069 }
1070 if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1071 (so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1072 m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
1073 return 1;
1074
1075 case EMU_IRC:
1076 /*
1077 * Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1078 */
1079 *(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */
1080 if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1081 return 1;
1082
1083 /* The %256s is for the broken mIRC */
1084 if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1085 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1086 return 1;
1087
1088 m->m_len = bptr - m->m_data; /* Adjust length */
1089 m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
1090 (unsigned long)ntohl(so->so_faddr.s_addr),
1091 ntohs(so->so_fport), 1);
1092 } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1093 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1094 return 1;
1095
1096 m->m_len = bptr - m->m_data; /* Adjust length */
1097 m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
1098 buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1099 ntohs(so->so_fport), n1, 1);
1100 } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1101 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1102 return 1;
1103
1104 m->m_len = bptr - m->m_data; /* Adjust length */
1105 m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
1106 buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1107 ntohs(so->so_fport), n1, 1);
1108 }
1109 return 1;
1110
1111 case EMU_REALAUDIO:
1112 /*
1113 * RealAudio emulation - JP. We must try to parse the incoming
1114 * data and try to find the two characters that contain the
1115 * port number. Then we redirect an udp port and replace the
1116 * number with the real port we got.
1117 *
1118 * The 1.0 beta versions of the player are not supported
1119 * any more.
1120 *
1121 * A typical packet for player version 1.0 (release version):
1122 *
1123 * 0000:50 4E 41 00 05
1124 * 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....×..gælÜc..P
1125 * 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1126 * 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1127 * 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1128 *
1129 * Now the port number 0x1BD7 is found at offset 0x04 of the
1130 * Now the port number 0x1BD7 is found at offset 0x04 of the
1131 * second packet. This time we received five bytes first and
1132 * then the rest. You never know how many bytes you get.
1133 *
1134 * A typical packet for player version 2.0 (beta):
1135 *
1136 * 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........Á.
1137 * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..Win2.0.0
1138 * 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1139 * 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1140 * 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1141 *
1142 * Port number 0x1BC1 is found at offset 0x0d.
1143 *
1144 * This is just a horrible switch statement. Variable ra tells
1145 * us where we're going.
1146 */
1147
1148 bptr = m->m_data;
1149 while (bptr < m->m_data + m->m_len) {
1150 u_short p;
1151 static int ra = 0;
1152 char ra_tbl[4];
1153
1154 ra_tbl[0] = 0x50;
1155 ra_tbl[1] = 0x4e;
1156 ra_tbl[2] = 0x41;
1157 ra_tbl[3] = 0;
1158
1159 switch (ra) {
1160 case 0:
1161 case 2:
1162 case 3:
1163 if (*bptr++ != ra_tbl[ra]) {
1164 ra = 0;
1165 continue;
1166 }
1167 break;
1168
1169 case 1:
1170 /*
1171 * We may get 0x50 several times, ignore them
1172 */
1173 if (*bptr == 0x50) {
1174 ra = 1;
1175 bptr++;
1176 continue;
1177 } else if (*bptr++ != ra_tbl[ra]) {
1178 ra = 0;
1179 continue;
1180 }
1181 break;
1182
1183 case 4:
1184 /*
1185 * skip version number
1186 */
1187 bptr++;
1188 break;
1189
1190 case 5:
1191 /*
1192 * The difference between versions 1.0 and
1193 * 2.0 is here. For future versions of
1194 * the player this may need to be modified.
1195 */
1196 if (*(bptr + 1) == 0x02)
1197 bptr += 8;
1198 else
1199 bptr += 4;
1200 break;
1201
1202 case 6:
1203 /* This is the field containing the port
1204 * number that RA-player is listening to.
1205 */
1206 lport = (((u_char*)bptr)[0] << 8)
1207 + ((u_char *)bptr)[1];
1208 if (lport < 6970)
1209 lport += 256; /* don't know why */
1210 if (lport < 6970 || lport > 7170)
1211 return 1; /* failed */
1212
1213 /* try to get udp port between 6970 - 7170 */
1214 for (p = 6970; p < 7071; p++) {
1215 if (udp_listen( htons(p),
1216 so->so_laddr.s_addr,
1217 htons(lport),
1218 SS_FACCEPTONCE)) {
1219 break;
1220 }
1221 }
1222 if (p == 7071)
1223 p = 0;
1224 *(u_char *)bptr++ = (p >> 8) & 0xff;
1225 *(u_char *)bptr++ = p & 0xff;
1226 ra = 0;
1227 return 1; /* port redirected, we're done */
1228 break;
1229
1230 default:
1231 ra = 0;
1232 }
1233 ra++;
1234 }
1235 return 1;
1236
1237 default:
1238 /* Ooops, not emulated, won't call tcp_emu again */
1239 so->so_emu = 0;
1240 return 1;
1241 }
1242 }
1243
1244 /*
1245 * Do misc. config of SLiRP while its running.
1246 * Return 0 if this connections is to be closed, 1 otherwise,
1247 * return 2 if this is a command-line connection
1248 */
1249 int
1250 tcp_ctl(so)
1251 struct socket *so;
1252 {
1253 #if 0
1254 struct sbuf *sb = &so->so_snd;
1255 int command;
1256 struct ex_list *ex_ptr;
1257 int do_pty;
1258 struct socket *tmpso;
1259
1260 DEBUG_CALL("tcp_ctl");
1261 DEBUG_ARG("so = %lx", (long )so);
1262
1263 /*
1264 * Check if they're authorised
1265 */
1266 if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 || (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1267 sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1268 sb->sb_wptr += sb->sb_cc;
1269 return 0;
1270 }
1271
1272 command = (ntohl(so->so_faddr.s_addr) & 0xff);
1273
1274 switch(command) {
1275 default: /* Check for exec's */
1276
1277 /*
1278 * Check if it's pty_exec
1279 */
1280 for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1281 if (ex_ptr->ex_fport == so->so_fport &&
1282 command == ex_ptr->ex_addr) {
1283 do_pty = ex_ptr->ex_pty;
1284 goto do_exec;
1285 }
1286 }
1287
1288 /*
1289 * Nothing bound..
1290 */
1291 /* tcp_fconnect(so); */
1292
1293 /* FALLTHROUGH */
1294 case CTL_ALIAS:
1295 sb->sb_cc = sprintf(sb->sb_wptr,
1296 "Error: No application configured.\r\n");
1297 sb->sb_wptr += sb->sb_cc;
1298 return(0);
1299
1300 do_exec:
1301 DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1302 return(fork_exec(so, ex_ptr->ex_exec, do_pty));
1303
1304 case CTL_CMD:
1305 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1306 if (tmpso->so_emu == EMU_CTL &&
1307 !(tmpso->so_tcpcb?
1308 (tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK))
1309 :0)) {
1310 /* Ooops, control connection already active */
1311 sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1312 sb->sb_wptr += sb->sb_cc;
1313 return 0;
1314 }
1315 }
1316 so->so_emu = EMU_CTL;
1317 ctl_password_ok = 0;
1318 sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1319 sb->sb_wptr += sb->sb_cc;
1320 do_echo=-1;
1321 return(2);
1322 }
1323 #else
1324 return 0;
1325 #endif
1326 }
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