1 /*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93
34 * tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
35 */
36
37 /*
38 * Changes and additions relating to SLiRP
39 * Copyright (c) 1995 Danny Gasparovski.
40 *
41 * Please read the file COPYRIGHT for the
42 * terms and conditions of the copyright.
43 */
44
45 #define WANT_SYS_IOCTL_H
46 #include <slirp.h>
47
48 /* patchable/settable parameters for tcp */
49 int tcp_mssdflt = TCP_MSS;
50 int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
51 int tcp_do_rfc1323 = 0; /* Don't do rfc1323 performance enhancements */
52 int tcp_rcvspace; /* You may want to change this */
53 int tcp_sndspace; /* Keep small if you have an error prone link */
54
55 /*
56 * Tcp initialization
57 */
58 void
tcp_init()59 tcp_init()
60 {
61 tcp_iss = 1; /* wrong */
62 tcb.so_next = tcb.so_prev = &tcb;
63
64 /* tcp_rcvspace = our Window we advertise to the remote */
65 tcp_rcvspace = TCP_RCVSPACE;
66 tcp_sndspace = TCP_SNDSPACE;
67
68 /* Make sure tcp_sndspace is at least 2*MSS */
69 if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
70 tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
71 }
72
73 /*
74 * Create template to be used to send tcp packets on a connection.
75 * Call after host entry created, fills
76 * in a skeletal tcp/ip header, minimizing the amount of work
77 * necessary when the connection is used.
78 */
79 /* struct tcpiphdr * */
80 void
tcp_template(tp)81 tcp_template(tp)
82 struct tcpcb *tp;
83 {
84 struct socket *so = tp->t_socket;
85 register struct tcpiphdr *n = &tp->t_template;
86
87 n->ti_next = n->ti_prev = 0;
88 n->ti_x1 = 0;
89 n->ti_pr = IPPROTO_TCP;
90 n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
91 n->ti_src = so->so_faddr;
92 n->ti_dst = so->so_laddr;
93 n->ti_sport = so->so_fport;
94 n->ti_dport = so->so_lport;
95
96 n->ti_seq = 0;
97 n->ti_ack = 0;
98 n->ti_x2 = 0;
99 n->ti_off = 5;
100 n->ti_flags = 0;
101 n->ti_win = 0;
102 n->ti_sum = 0;
103 n->ti_urp = 0;
104 }
105
106 /*
107 * Send a single message to the TCP at address specified by
108 * the given TCP/IP header. If m == 0, then we make a copy
109 * of the tcpiphdr at ti and send directly to the addressed host.
110 * This is used to force keep alive messages out using the TCP
111 * template for a connection tp->t_template. If flags are given
112 * then we send a message back to the TCP which originated the
113 * segment ti, and discard the mbuf containing it and any other
114 * attached mbufs.
115 *
116 * In any case the ack and sequence number of the transmitted
117 * segment are as specified by the parameters.
118 */
119 void
tcp_respond(tp,ti,m,ack,seq,flags)120 tcp_respond(tp, ti, m, ack, seq, flags)
121 struct tcpcb *tp;
122 register struct tcpiphdr *ti;
123 register struct mbuf *m;
124 tcp_seq ack, seq;
125 int flags;
126 {
127 register int tlen;
128 int win = 0;
129
130 DEBUG_CALL("tcp_respond");
131 DEBUG_ARG("tp = %lx", (long)tp);
132 DEBUG_ARG("ti = %lx", (long)ti);
133 DEBUG_ARG("m = %lx", (long)m);
134 DEBUG_ARG("ack = %u", ack);
135 DEBUG_ARG("seq = %u", seq);
136 DEBUG_ARG("flags = %x", flags);
137
138 if (tp)
139 win = sbspace(&tp->t_socket->so_rcv);
140 if (m == 0) {
141 if ((m = m_get()) == NULL)
142 return;
143 #ifdef TCP_COMPAT_42
144 tlen = 1;
145 #else
146 tlen = 0;
147 #endif
148 m->m_data += if_maxlinkhdr;
149 *mtod(m, struct tcpiphdr *) = *ti;
150 ti = mtod(m, struct tcpiphdr *);
151 flags = TH_ACK;
152 } else {
153 /*
154 * ti points into m so the next line is just making
155 * the mbuf point to ti
156 */
157 m->m_data = (caddr_t)ti;
158
159 m->m_len = sizeof (struct tcpiphdr);
160 tlen = 0;
161 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
162 xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
163 xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
164 #undef xchg
165 }
166 ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
167 tlen += sizeof (struct tcpiphdr);
168 m->m_len = tlen;
169
170 ti->ti_next = ti->ti_prev = 0;
171 ti->ti_x1 = 0;
172 ti->ti_seq = htonl(seq);
173 ti->ti_ack = htonl(ack);
174 ti->ti_x2 = 0;
175 ti->ti_off = sizeof (struct tcphdr) >> 2;
176 ti->ti_flags = flags;
177 if (tp)
178 ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
179 else
180 ti->ti_win = htons((u_int16_t)win);
181 ti->ti_urp = 0;
182 ti->ti_sum = 0;
183 ti->ti_sum = cksum(m, tlen);
184 ((struct ip *)ti)->ip_len = tlen;
185
186 if(flags & TH_RST)
187 ((struct ip *)ti)->ip_ttl = MAXTTL;
188 else
189 ((struct ip *)ti)->ip_ttl = ip_defttl;
190
191 (void) ip_output((struct socket *)0, m);
192 }
193
194 /*
195 * Create a new TCP control block, making an
196 * empty reassembly queue and hooking it to the argument
197 * protocol control block.
198 */
199 struct tcpcb *
tcp_newtcpcb(so)200 tcp_newtcpcb(so)
201 struct socket *so;
202 {
203 register struct tcpcb *tp;
204
205 tp = (struct tcpcb *)malloc(sizeof(*tp));
206 if (tp == NULL)
207 return ((struct tcpcb *)0);
208
209 memset((char *) tp, 0, sizeof(struct tcpcb));
210 tp->seg_next = tp->seg_prev = (tcpiphdrp_32)tp;
211 tp->t_maxseg = tcp_mssdflt;
212
213 tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
214 tp->t_socket = so;
215
216 /*
217 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
218 * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
219 * reasonable initial retransmit time.
220 */
221 tp->t_srtt = TCPTV_SRTTBASE;
222 tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
223 tp->t_rttmin = TCPTV_MIN;
224
225 TCPT_RANGESET(tp->t_rxtcur,
226 ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
227 TCPTV_MIN, TCPTV_REXMTMAX);
228
229 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
230 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
231 tp->t_state = TCPS_CLOSED;
232
233 so->so_tcpcb = tp;
234
235 return (tp);
236 }
237
238 /*
239 * Drop a TCP connection, reporting
240 * the specified error. If connection is synchronized,
241 * then send a RST to peer.
242 */
tcp_drop(struct tcpcb * tp,int err)243 struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
244 {
245 /* tcp_drop(tp, errno)
246 register struct tcpcb *tp;
247 int errno;
248 {
249 */
250
251 DEBUG_CALL("tcp_drop");
252 DEBUG_ARG("tp = %lx", (long)tp);
253 DEBUG_ARG("errno = %d", errno);
254
255 if (TCPS_HAVERCVDSYN(tp->t_state)) {
256 tp->t_state = TCPS_CLOSED;
257 (void) tcp_output(tp);
258 tcpstat.tcps_drops++;
259 } else
260 tcpstat.tcps_conndrops++;
261 /* if (errno == ETIMEDOUT && tp->t_softerror)
262 * errno = tp->t_softerror;
263 */
264 /* so->so_error = errno; */
265 return (tcp_close(tp));
266 }
267
268 /*
269 * Close a TCP control block:
270 * discard all space held by the tcp
271 * discard internet protocol block
272 * wake up any sleepers
273 */
274 struct tcpcb *
tcp_close(tp)275 tcp_close(tp)
276 register struct tcpcb *tp;
277 {
278 register struct tcpiphdr *t;
279 struct socket *so = tp->t_socket;
280 register struct mbuf *m;
281
282 DEBUG_CALL("tcp_close");
283 DEBUG_ARG("tp = %lx", (long )tp);
284
285 /* free the reassembly queue, if any */
286 t = (struct tcpiphdr *) tp->seg_next;
287 while (t != (struct tcpiphdr *)tp) {
288 t = (struct tcpiphdr *)t->ti_next;
289 m = (struct mbuf *) REASS_MBUF((struct tcpiphdr *)t->ti_prev);
290 remque_32((struct tcpiphdr *) t->ti_prev);
291 m_freem(m);
292 }
293 /* It's static */
294 /* if (tp->t_template)
295 * (void) m_free(dtom(tp->t_template));
296 */
297 /* free(tp, M_PCB); */
298 free(tp);
299 so->so_tcpcb = 0;
300 soisfdisconnected(so);
301 /* clobber input socket cache if we're closing the cached connection */
302 if (so == tcp_last_so)
303 tcp_last_so = &tcb;
304 close(so->s);
305 sbfree(&so->so_rcv);
306 sbfree(&so->so_snd);
307 sofree(so);
308 tcpstat.tcps_closed++;
309 return ((struct tcpcb *)0);
310 }
311
312 void
tcp_drain()313 tcp_drain()
314 {
315 /* XXX */
316 }
317
318 /*
319 * When a source quench is received, close congestion window
320 * to one segment. We will gradually open it again as we proceed.
321 */
322
323 #ifdef notdef
324
325 void
tcp_quench(i,errno)326 tcp_quench(i, errno)
327
328 int errno;
329 {
330 struct tcpcb *tp = intotcpcb(inp);
331
332 if (tp)
333 tp->snd_cwnd = tp->t_maxseg;
334 }
335
336 #endif /* notdef */
337
338 /*
339 * TCP protocol interface to socket abstraction.
340 */
341
342 /*
343 * User issued close, and wish to trail through shutdown states:
344 * if never received SYN, just forget it. If got a SYN from peer,
345 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
346 * If already got a FIN from peer, then almost done; go to LAST_ACK
347 * state. In all other cases, have already sent FIN to peer (e.g.
348 * after PRU_SHUTDOWN), and just have to play tedious game waiting
349 * for peer to send FIN or not respond to keep-alives, etc.
350 * We can let the user exit from the close as soon as the FIN is acked.
351 */
352 void
tcp_sockclosed(tp)353 tcp_sockclosed(tp)
354 struct tcpcb *tp;
355 {
356
357 DEBUG_CALL("tcp_sockclosed");
358 DEBUG_ARG("tp = %lx", (long)tp);
359
360 switch (tp->t_state) {
361
362 case TCPS_CLOSED:
363 case TCPS_LISTEN:
364 case TCPS_SYN_SENT:
365 tp->t_state = TCPS_CLOSED;
366 tp = tcp_close(tp);
367 break;
368
369 case TCPS_SYN_RECEIVED:
370 case TCPS_ESTABLISHED:
371 tp->t_state = TCPS_FIN_WAIT_1;
372 break;
373
374 case TCPS_CLOSE_WAIT:
375 tp->t_state = TCPS_LAST_ACK;
376 break;
377 }
378 /* soisfdisconnecting(tp->t_socket); */
379 if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
380 soisfdisconnected(tp->t_socket);
381 if (tp)
382 tcp_output(tp);
383 }
384
385 /*
386 * Connect to a host on the Internet
387 * Called by tcp_input
388 * Only do a connect, the tcp fields will be set in tcp_input
389 * return 0 if there's a result of the connect,
390 * else return -1 means we're still connecting
391 * The return value is almost always -1 since the socket is
392 * nonblocking. Connect returns after the SYN is sent, and does
393 * not wait for ACK+SYN.
394 */
tcp_fconnect(so)395 int tcp_fconnect(so)
396 struct socket *so;
397 {
398 int ret=0;
399
400 DEBUG_CALL("tcp_fconnect");
401 DEBUG_ARG("so = %lx", (long )so);
402
403 if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
404 int opt, s=so->s;
405 struct sockaddr_in addr;
406
407 fd_nonblock(s);
408 opt = 1;
409 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
410 opt = 1;
411 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
412
413 addr.sin_family = AF_INET;
414 if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
415 /* It's an alias */
416 switch(ntohl(so->so_faddr.s_addr) & 0xff) {
417 case CTL_DNS:
418 addr.sin_addr = dns_addr;
419 break;
420 case CTL_ALIAS:
421 default:
422 addr.sin_addr = loopback_addr;
423 break;
424 }
425 } else
426 addr.sin_addr = so->so_faddr;
427 addr.sin_port = so->so_fport;
428
429 DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
430 "addr.sin_addr.s_addr=%.16s\n",
431 ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
432 /* We don't care what port we get */
433 ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
434
435 /*
436 * If it's not in progress, it failed, so we just return 0,
437 * without clearing SS_NOFDREF
438 */
439 soisfconnecting(so);
440 }
441
442 return(ret);
443 }
444
445 /*
446 * Accept the socket and connect to the local-host
447 *
448 * We have a problem. The correct thing to do would be
449 * to first connect to the local-host, and only if the
450 * connection is accepted, then do an accept() here.
451 * But, a) we need to know who's trying to connect
452 * to the socket to be able to SYN the local-host, and
453 * b) we are already connected to the foreign host by
454 * the time it gets to accept(), so... We simply accept
455 * here and SYN the local-host.
456 */
457 void
tcp_connect(inso)458 tcp_connect(inso)
459 struct socket *inso;
460 {
461 struct socket *so;
462 struct sockaddr_in addr;
463 int addrlen = sizeof(struct sockaddr_in);
464 struct tcpcb *tp;
465 int s, opt;
466
467 DEBUG_CALL("tcp_connect");
468 DEBUG_ARG("inso = %lx", (long)inso);
469
470 /*
471 * If it's an SS_ACCEPTONCE socket, no need to socreate()
472 * another socket, just use the accept() socket.
473 */
474 if (inso->so_state & SS_FACCEPTONCE) {
475 /* FACCEPTONCE already have a tcpcb */
476 so = inso;
477 } else {
478 if ((so = socreate()) == NULL) {
479 /* If it failed, get rid of the pending connection */
480 close(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
481 return;
482 }
483 if (tcp_attach(so) < 0) {
484 free(so); /* NOT sofree */
485 return;
486 }
487 so->so_laddr = inso->so_laddr;
488 so->so_lport = inso->so_lport;
489 }
490
491 (void) tcp_mss(sototcpcb(so), 0);
492
493 if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
494 tcp_close(sototcpcb(so)); /* This will sofree() as well */
495 return;
496 }
497 fd_nonblock(s);
498 opt = 1;
499 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
500 opt = 1;
501 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
502
503 so->so_fport = addr.sin_port;
504 so->so_faddr = addr.sin_addr;
505 /* Translate connections from localhost to the real hostname */
506 if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr)
507 so->so_faddr = our_addr;
508
509 /* Close the accept() socket, set right state */
510 if (inso->so_state & SS_FACCEPTONCE) {
511 close(so->s); /* If we only accept once, close the accept() socket */
512 so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
513 /* if it's not FACCEPTONCE, it's already NOFDREF */
514 }
515 so->s = s;
516
517 so->so_iptos = tcp_tos(so);
518 tp = sototcpcb(so);
519
520 tcp_template(tp);
521
522 /* Compute window scaling to request. */
523 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
524 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
525 * tp->request_r_scale++;
526 */
527
528 /* soisconnecting(so); */ /* NOFDREF used instead */
529 tcpstat.tcps_connattempt++;
530
531 tp->t_state = TCPS_SYN_SENT;
532 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
533 tp->iss = tcp_iss;
534 tcp_iss += TCP_ISSINCR/2;
535 tcp_sendseqinit(tp);
536 tcp_output(tp);
537 }
538
539 /*
540 * Attach a TCPCB to a socket.
541 */
542 int
tcp_attach(so)543 tcp_attach(so)
544 struct socket *so;
545 {
546 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
547 return -1;
548
549 insque(so, &tcb);
550
551 return 0;
552 }
553
554 /*
555 * Set the socket's type of service field
556 */
557 struct tos_t tcptos[] = {
558 {0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
559 {21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
560 {0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
561 {0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
562 {0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT}, /* rlogin */
563 {0, 514, IPTOS_LOWDELAY, EMU_RSH|EMU_NOCONNECT}, /* shell */
564 {0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
565 {0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
566 {0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
567 {0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
568 {0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
569 {0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
570 {0, 0, 0, 0}
571 };
572
573 struct emu_t *tcpemu = 0;
574
575 /*
576 * Return TOS according to the above table
577 */
578 u_int8_t
tcp_tos(so)579 tcp_tos(so)
580 struct socket *so;
581 {
582 int i = 0;
583 struct emu_t *emup;
584
585 while(tcptos[i].tos) {
586 if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
587 (tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
588 so->so_emu = tcptos[i].emu;
589 return tcptos[i].tos;
590 }
591 i++;
592 }
593
594 /* Nope, lets see if there's a user-added one */
595 for (emup = tcpemu; emup; emup = emup->next) {
596 if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
597 (emup->lport && (ntohs(so->so_lport) == emup->lport))) {
598 so->so_emu = emup->emu;
599 return emup->tos;
600 }
601 }
602
603 return 0;
604 }
605
606 int do_echo = -1;
607
608 /*
609 * Emulate programs that try and connect to us
610 * This includes ftp (the data connection is
611 * initiated by the server) and IRC (DCC CHAT and
612 * DCC SEND) for now
613 *
614 * NOTE: It's possible to crash SLiRP by sending it
615 * unstandard strings to emulate... if this is a problem,
616 * more checks are needed here
617 *
618 * XXX Assumes the whole command came in one packet
619 *
620 * XXX Some ftp clients will have their TOS set to
621 * LOWDELAY and so Nagel will kick in. Because of this,
622 * we'll get the first letter, followed by the rest, so
623 * we simply scan for ORT instead of PORT...
624 * DCC doesn't have this problem because there's other stuff
625 * in the packet before the DCC command.
626 *
627 * Return 1 if the mbuf m is still valid and should be
628 * sbappend()ed
629 *
630 * NOTE: if you return 0 you MUST m_free() the mbuf!
631 */
632 int
tcp_emu(so,m)633 tcp_emu(so, m)
634 struct socket *so;
635 struct mbuf *m;
636 {
637 u_int n1, n2, n3, n4, n5, n6;
638 char buff[256];
639 u_int32_t laddr;
640 u_int lport;
641 char *bptr;
642
643 DEBUG_CALL("tcp_emu");
644 DEBUG_ARG("so = %lx", (long)so);
645 DEBUG_ARG("m = %lx", (long)m);
646
647 switch(so->so_emu) {
648 int x, i;
649
650 case EMU_IDENT:
651 /*
652 * Identification protocol as per rfc-1413
653 */
654
655 {
656 struct socket *tmpso;
657 struct sockaddr_in addr;
658 int addrlen = sizeof(struct sockaddr_in);
659 struct sbuf *so_rcv = &so->so_rcv;
660
661 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
662 so_rcv->sb_wptr += m->m_len;
663 so_rcv->sb_rptr += m->m_len;
664 m->m_data[m->m_len] = 0; /* NULL terminate */
665 if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
666 if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) {
667 HTONS(n1);
668 HTONS(n2);
669 /* n2 is the one on our host */
670 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
671 if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
672 tmpso->so_lport == n2 &&
673 tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
674 tmpso->so_fport == n1) {
675 if (getsockname(tmpso->s,
676 (struct sockaddr *)&addr, &addrlen) == 0)
677 n2 = ntohs(addr.sin_port);
678 break;
679 }
680 }
681 }
682 so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
683 so_rcv->sb_rptr = so_rcv->sb_data;
684 so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
685 }
686 m_free(m);
687 return 0;
688 }
689
690 #if 0
691 case EMU_RLOGIN:
692 /*
693 * Rlogin emulation
694 * First we accumulate all the initial option negotiation,
695 * then fork_exec() rlogin according to the options
696 */
697 {
698 int i, i2, n;
699 char *ptr;
700 char args[100];
701 char term[100];
702 struct sbuf *so_snd = &so->so_snd;
703 struct sbuf *so_rcv = &so->so_rcv;
704
705 /* First check if they have a priveladged port, or too much data has arrived */
706 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
707 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
708 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
709 so_snd->sb_wptr += 18;
710 so_snd->sb_cc += 18;
711 tcp_sockclosed(sototcpcb(so));
712 m_free(m);
713 return 0;
714 }
715
716 /* Append the current data */
717 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
718 so_rcv->sb_wptr += m->m_len;
719 so_rcv->sb_rptr += m->m_len;
720 m_free(m);
721
722 /*
723 * Check if we have all the initial options,
724 * and build argument list to rlogin while we're here
725 */
726 n = 0;
727 ptr = so_rcv->sb_data;
728 args[0] = 0;
729 term[0] = 0;
730 while (ptr < so_rcv->sb_wptr) {
731 if (*ptr++ == 0) {
732 n++;
733 if (n == 2) {
734 sprintf(args, "rlogin -l %s %s",
735 ptr, inet_ntoa(so->so_faddr));
736 } else if (n == 3) {
737 i2 = so_rcv->sb_wptr - ptr;
738 for (i = 0; i < i2; i++) {
739 if (ptr[i] == '/') {
740 ptr[i] = 0;
741 #ifdef HAVE_SETENV
742 sprintf(term, "%s", ptr);
743 #else
744 sprintf(term, "TERM=%s", ptr);
745 #endif
746 ptr[i] = '/';
747 break;
748 }
749 }
750 }
751 }
752 }
753
754 if (n != 4)
755 return 0;
756
757 /* We have it, set our term variable and fork_exec() */
758 #ifdef HAVE_SETENV
759 setenv("TERM", term, 1);
760 #else
761 putenv(term);
762 #endif
763 fork_exec(so, args, 2);
764 term[0] = 0;
765 so->so_emu = 0;
766
767 /* And finally, send the client a 0 character */
768 so_snd->sb_wptr[0] = 0;
769 so_snd->sb_wptr++;
770 so_snd->sb_cc++;
771
772 return 0;
773 }
774
775 case EMU_RSH:
776 /*
777 * rsh emulation
778 * First we accumulate all the initial option negotiation,
779 * then rsh_exec() rsh according to the options
780 */
781 {
782 int n;
783 char *ptr;
784 char *user;
785 char *args;
786 struct sbuf *so_snd = &so->so_snd;
787 struct sbuf *so_rcv = &so->so_rcv;
788
789 /* First check if they have a priveladged port, or too much data has arrived */
790 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
791 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
792 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
793 so_snd->sb_wptr += 18;
794 so_snd->sb_cc += 18;
795 tcp_sockclosed(sototcpcb(so));
796 m_free(m);
797 return 0;
798 }
799
800 /* Append the current data */
801 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
802 so_rcv->sb_wptr += m->m_len;
803 so_rcv->sb_rptr += m->m_len;
804 m_free(m);
805
806 /*
807 * Check if we have all the initial options,
808 * and build argument list to rlogin while we're here
809 */
810 n = 0;
811 ptr = so_rcv->sb_data;
812 user="";
813 args="";
814 if (so->extra==NULL) {
815 struct socket *ns;
816 struct tcpcb* tp;
817 int port=atoi(ptr);
818 if (port <= 0) return 0;
819 if (port > 1023 || port < 512) {
820 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
821 so_snd->sb_wptr += 18;
822 so_snd->sb_cc += 18;
823 tcp_sockclosed(sototcpcb(so));
824 return 0;
825 }
826 if ((ns=socreate()) == NULL)
827 return 0;
828 if (tcp_attach(ns)<0) {
829 free(ns);
830 return 0;
831 }
832
833 ns->so_laddr=so->so_laddr;
834 ns->so_lport=htons(port);
835
836 (void) tcp_mss(sototcpcb(ns), 0);
837
838 ns->so_faddr=so->so_faddr;
839 ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
840
841 if (ns->so_faddr.s_addr == 0 ||
842 ns->so_faddr.s_addr == loopback_addr.s_addr)
843 ns->so_faddr = our_addr;
844
845 ns->so_iptos = tcp_tos(ns);
846 tp = sototcpcb(ns);
847
848 tcp_template(tp);
849
850 /* Compute window scaling to request. */
851 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
852 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
853 * tp->request_r_scale++;
854 */
855
856 /*soisfconnecting(ns);*/
857
858 tcpstat.tcps_connattempt++;
859
860 tp->t_state = TCPS_SYN_SENT;
861 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
862 tp->iss = tcp_iss;
863 tcp_iss += TCP_ISSINCR/2;
864 tcp_sendseqinit(tp);
865 tcp_output(tp);
866 so->extra=ns;
867 }
868 while (ptr < so_rcv->sb_wptr) {
869 if (*ptr++ == 0) {
870 n++;
871 if (n == 2) {
872 user=ptr;
873 } else if (n == 3) {
874 args=ptr;
875 }
876 }
877 }
878
879 if (n != 4)
880 return 0;
881
882 rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
883 so->so_emu = 0;
884 so->extra=NULL;
885
886 /* And finally, send the client a 0 character */
887 so_snd->sb_wptr[0] = 0;
888 so_snd->sb_wptr++;
889 so_snd->sb_cc++;
890
891 return 0;
892 }
893
894 case EMU_CTL:
895 {
896 int num;
897 struct sbuf *so_snd = &so->so_snd;
898 struct sbuf *so_rcv = &so->so_rcv;
899
900 /*
901 * If there is binary data here, we save it in so->so_m
902 */
903 if (!so->so_m) {
904 int rxlen;
905 char *rxdata;
906 rxdata=mtod(m, char *);
907 for (rxlen=m->m_len; rxlen; rxlen--) {
908 if (*rxdata++ & 0x80) {
909 so->so_m = m;
910 return 0;
911 }
912 }
913 } /* if(so->so_m==NULL) */
914
915 /*
916 * Append the line
917 */
918 sbappendsb(so_rcv, m);
919
920 /* To avoid going over the edge of the buffer, we reset it */
921 if (so_snd->sb_cc == 0)
922 so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
923
924 /*
925 * A bit of a hack:
926 * If the first packet we get here is 1 byte long, then it
927 * was done in telnet character mode, therefore we must echo
928 * the characters as they come. Otherwise, we echo nothing,
929 * because in linemode, the line is already echoed
930 * XXX two or more control connections won't work
931 */
932 if (do_echo == -1) {
933 if (m->m_len == 1) do_echo = 1;
934 else do_echo = 0;
935 }
936 if (do_echo) {
937 sbappendsb(so_snd, m);
938 m_free(m);
939 tcp_output(sototcpcb(so)); /* XXX */
940 } else
941 m_free(m);
942
943 num = 0;
944 while (num < so->so_rcv.sb_cc) {
945 if (*(so->so_rcv.sb_rptr + num) == '\n' ||
946 *(so->so_rcv.sb_rptr + num) == '\r') {
947 int n;
948
949 *(so_rcv->sb_rptr + num) = 0;
950 if (ctl_password && !ctl_password_ok) {
951 /* Need a password */
952 if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
953 if (strcmp(buff, ctl_password) == 0) {
954 ctl_password_ok = 1;
955 n = sprintf(so_snd->sb_wptr,
956 "Password OK.\r\n");
957 goto do_prompt;
958 }
959 }
960 n = sprintf(so_snd->sb_wptr,
961 "Error: Password required, log on with \"pass PASSWORD\"\r\n");
962 goto do_prompt;
963 }
964 cfg_quitting = 0;
965 n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
966 if (!cfg_quitting) {
967 /* Register the printed data */
968 do_prompt:
969 so_snd->sb_cc += n;
970 so_snd->sb_wptr += n;
971 /* Add prompt */
972 n = sprintf(so_snd->sb_wptr, "Slirp> ");
973 so_snd->sb_cc += n;
974 so_snd->sb_wptr += n;
975 }
976 /* Drop so_rcv data */
977 so_rcv->sb_cc = 0;
978 so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
979 tcp_output(sototcpcb(so)); /* Send the reply */
980 }
981 num++;
982 }
983 return 0;
984 }
985 #endif
986 case EMU_FTP: /* ftp */
987 *(m->m_data+m->m_len) = 0; /* NULL terminate for strstr */
988 if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
989 /*
990 * Need to emulate the PORT command
991 */
992 x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
993 &n1, &n2, &n3, &n4, &n5, &n6, buff);
994 if (x < 6)
995 return 1;
996
997 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
998 lport = htons((n5 << 8) | (n6));
999
1000 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1001 return 1;
1002
1003 n6 = ntohs(so->so_fport);
1004
1005 n5 = (n6 >> 8) & 0xff;
1006 n6 &= 0xff;
1007
1008 laddr = ntohl(so->so_faddr.s_addr);
1009
1010 n1 = ((laddr >> 24) & 0xff);
1011 n2 = ((laddr >> 16) & 0xff);
1012 n3 = ((laddr >> 8) & 0xff);
1013 n4 = (laddr & 0xff);
1014
1015 m->m_len = bptr - m->m_data; /* Adjust length */
1016 m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
1017 n1, n2, n3, n4, n5, n6, x==7?buff:"");
1018 return 1;
1019 } else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
1020 /*
1021 * Need to emulate the PASV response
1022 */
1023 x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
1024 &n1, &n2, &n3, &n4, &n5, &n6, buff);
1025 if (x < 6)
1026 return 1;
1027
1028 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
1029 lport = htons((n5 << 8) | (n6));
1030
1031 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1032 return 1;
1033
1034 n6 = ntohs(so->so_fport);
1035
1036 n5 = (n6 >> 8) & 0xff;
1037 n6 &= 0xff;
1038
1039 laddr = ntohl(so->so_faddr.s_addr);
1040
1041 n1 = ((laddr >> 24) & 0xff);
1042 n2 = ((laddr >> 16) & 0xff);
1043 n3 = ((laddr >> 8) & 0xff);
1044 n4 = (laddr & 0xff);
1045
1046 m->m_len = bptr - m->m_data; /* Adjust length */
1047 m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1048 n1, n2, n3, n4, n5, n6, x==7?buff:"");
1049
1050 return 1;
1051 }
1052
1053 return 1;
1054
1055 case EMU_KSH:
1056 /*
1057 * The kshell (Kerberos rsh) and shell services both pass
1058 * a local port port number to carry signals to the server
1059 * and stderr to the client. It is passed at the beginning
1060 * of the connection as a NUL-terminated decimal ASCII string.
1061 */
1062 so->so_emu = 0;
1063 for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1064 if (m->m_data[i] < '0' || m->m_data[i] > '9')
1065 return 1; /* invalid number */
1066 lport *= 10;
1067 lport += m->m_data[i] - '0';
1068 }
1069 if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1070 (so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1071 m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
1072 return 1;
1073
1074 case EMU_IRC:
1075 /*
1076 * Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1077 */
1078 *(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */
1079 if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1080 return 1;
1081
1082 /* The %256s is for the broken mIRC */
1083 if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1084 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1085 return 1;
1086
1087 m->m_len = bptr - m->m_data; /* Adjust length */
1088 m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
1089 (unsigned long)ntohl(so->so_faddr.s_addr),
1090 ntohs(so->so_fport), 1);
1091 } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1092 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1093 return 1;
1094
1095 m->m_len = bptr - m->m_data; /* Adjust length */
1096 m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
1097 buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1098 ntohs(so->so_fport), n1, 1);
1099 } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1100 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1101 return 1;
1102
1103 m->m_len = bptr - m->m_data; /* Adjust length */
1104 m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
1105 buff, (unsigned long)ntohl(so->so_faddr.s_addr),
1106 ntohs(so->so_fport), n1, 1);
1107 }
1108 return 1;
1109
1110 case EMU_REALAUDIO:
1111 /*
1112 * RealAudio emulation - JP. We must try to parse the incoming
1113 * data and try to find the two characters that contain the
1114 * port number. Then we redirect an udp port and replace the
1115 * number with the real port we got.
1116 *
1117 * The 1.0 beta versions of the player are not supported
1118 * any more.
1119 *
1120 * A typical packet for player version 1.0 (release version):
1121 *
1122 * 0000:50 4E 41 00 05
1123 * 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....�..g�l�c..P
1124 * 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1125 * 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1126 * 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1127 *
1128 * Now the port number 0x1BD7 is found at offset 0x04 of the
1129 * Now the port number 0x1BD7 is found at offset 0x04 of the
1130 * second packet. This time we received five bytes first and
1131 * then the rest. You never know how many bytes you get.
1132 *
1133 * A typical packet for player version 2.0 (beta):
1134 *
1135 * 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........�.
1136 * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .gux�c..Win2.0.0
1137 * 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1138 * 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1139 * 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1140 *
1141 * Port number 0x1BC1 is found at offset 0x0d.
1142 *
1143 * This is just a horrible switch statement. Variable ra tells
1144 * us where we're going.
1145 */
1146
1147 bptr = m->m_data;
1148 while (bptr < m->m_data + m->m_len) {
1149 u_short p;
1150 static int ra = 0;
1151 char ra_tbl[4];
1152
1153 ra_tbl[0] = 0x50;
1154 ra_tbl[1] = 0x4e;
1155 ra_tbl[2] = 0x41;
1156 ra_tbl[3] = 0;
1157
1158 switch (ra) {
1159 case 0:
1160 case 2:
1161 case 3:
1162 if (*bptr++ != ra_tbl[ra]) {
1163 ra = 0;
1164 continue;
1165 }
1166 break;
1167
1168 case 1:
1169 /*
1170 * We may get 0x50 several times, ignore them
1171 */
1172 if (*bptr == 0x50) {
1173 ra = 1;
1174 bptr++;
1175 continue;
1176 } else if (*bptr++ != ra_tbl[ra]) {
1177 ra = 0;
1178 continue;
1179 }
1180 break;
1181
1182 case 4:
1183 /*
1184 * skip version number
1185 */
1186 bptr++;
1187 break;
1188
1189 case 5:
1190 /*
1191 * The difference between versions 1.0 and
1192 * 2.0 is here. For future versions of
1193 * the player this may need to be modified.
1194 */
1195 if (*(bptr + 1) == 0x02)
1196 bptr += 8;
1197 else
1198 bptr += 4;
1199 break;
1200
1201 case 6:
1202 /* This is the field containing the port
1203 * number that RA-player is listening to.
1204 */
1205 lport = (((u_char*)bptr)[0] << 8)
1206 + ((u_char *)bptr)[1];
1207 if (lport < 6970)
1208 lport += 256; /* don't know why */
1209 if (lport < 6970 || lport > 7170)
1210 return 1; /* failed */
1211
1212 /* try to get udp port between 6970 - 7170 */
1213 for (p = 6970; p < 7071; p++) {
1214 if (udp_listen( htons(p),
1215 so->so_laddr.s_addr,
1216 htons(lport),
1217 SS_FACCEPTONCE)) {
1218 break;
1219 }
1220 }
1221 if (p == 7071)
1222 p = 0;
1223 *(u_char *)bptr++ = (p >> 8) & 0xff;
1224 *(u_char *)bptr++ = p & 0xff;
1225 ra = 0;
1226 return 1; /* port redirected, we're done */
1227 break;
1228
1229 default:
1230 ra = 0;
1231 }
1232 ra++;
1233 }
1234 return 1;
1235
1236 default:
1237 /* Ooops, not emulated, won't call tcp_emu again */
1238 so->so_emu = 0;
1239 return 1;
1240 }
1241 }
1242
1243 /*
1244 * Do misc. config of SLiRP while its running.
1245 * Return 0 if this connections is to be closed, 1 otherwise,
1246 * return 2 if this is a command-line connection
1247 */
1248 int
tcp_ctl(so)1249 tcp_ctl(so)
1250 struct socket *so;
1251 {
1252 #if 0
1253 struct sbuf *sb = &so->so_snd;
1254 int command;
1255 struct ex_list *ex_ptr;
1256 int do_pty;
1257 struct socket *tmpso;
1258
1259 DEBUG_CALL("tcp_ctl");
1260 DEBUG_ARG("so = %lx", (long )so);
1261
1262 /*
1263 * Check if they're authorised
1264 */
1265 if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 || (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1266 sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1267 sb->sb_wptr += sb->sb_cc;
1268 return 0;
1269 }
1270
1271 command = (ntohl(so->so_faddr.s_addr) & 0xff);
1272
1273 switch(command) {
1274 default: /* Check for exec's */
1275
1276 /*
1277 * Check if it's pty_exec
1278 */
1279 for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1280 if (ex_ptr->ex_fport == so->so_fport &&
1281 command == ex_ptr->ex_addr) {
1282 do_pty = ex_ptr->ex_pty;
1283 goto do_exec;
1284 }
1285 }
1286
1287 /*
1288 * Nothing bound..
1289 */
1290 /* tcp_fconnect(so); */
1291
1292 /* FALLTHROUGH */
1293 case CTL_ALIAS:
1294 sb->sb_cc = sprintf(sb->sb_wptr,
1295 "Error: No application configured.\r\n");
1296 sb->sb_wptr += sb->sb_cc;
1297 return(0);
1298
1299 do_exec:
1300 DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1301 return(fork_exec(so, ex_ptr->ex_exec, do_pty));
1302
1303 case CTL_CMD:
1304 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1305 if (tmpso->so_emu == EMU_CTL &&
1306 !(tmpso->so_tcpcb?
1307 (tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK))
1308 :0)) {
1309 /* Ooops, control connection already active */
1310 sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1311 sb->sb_wptr += sb->sb_cc;
1312 return 0;
1313 }
1314 }
1315 so->so_emu = EMU_CTL;
1316 ctl_password_ok = 0;
1317 sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1318 sb->sb_wptr += sb->sb_cc;
1319 do_echo=-1;
1320 return(2);
1321 }
1322 #else
1323 return 0;
1324 #endif
1325 }
1326