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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93
30 * tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
31 */
32
33 /*
34 * Changes and additions relating to SLiRP
35 * Copyright (c) 1995 Danny Gasparovski.
36 *
37 * Please read the file COPYRIGHT for the
38 * terms and conditions of the copyright.
39 */
40
41 #include <slirp.h>
42
43 /* patchable/settable parameters for tcp */
44 /* Don't do rfc1323 performance enhancements */
45 #define TCP_DO_RFC1323 0
46
47 /*
48 * Tcp initialization
49 */
50 void
tcp_init(void)51 tcp_init(void)
52 {
53 tcp_iss = 1; /* wrong */
54 tcb.so_next = tcb.so_prev = &tcb;
55 }
56
57 /*
58 * Create template to be used to send tcp packets on a connection.
59 * Call after host entry created, fills
60 * in a skeletal tcp/ip header, minimizing the amount of work
61 * necessary when the connection is used.
62 */
63 /* struct tcpiphdr * */
64 void
tcp_template(struct tcpcb * tp)65 tcp_template(struct tcpcb *tp)
66 {
67 struct socket *so = tp->t_socket;
68 register struct tcpiphdr *n = &tp->t_template;
69
70 n->ti_mbuf = NULL;
71 n->ti_x1 = 0;
72 n->ti_pr = IPPROTO_TCP;
73 n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
74 n->ti_src = so->so_faddr;
75 n->ti_dst = so->so_laddr;
76 n->ti_sport = so->so_fport;
77 n->ti_dport = so->so_lport;
78
79 n->ti_seq = 0;
80 n->ti_ack = 0;
81 n->ti_x2 = 0;
82 n->ti_off = 5;
83 n->ti_flags = 0;
84 n->ti_win = 0;
85 n->ti_sum = 0;
86 n->ti_urp = 0;
87 }
88
89 /*
90 * Send a single message to the TCP at address specified by
91 * the given TCP/IP header. If m == 0, then we make a copy
92 * of the tcpiphdr at ti and send directly to the addressed host.
93 * This is used to force keep alive messages out using the TCP
94 * template for a connection tp->t_template. If flags are given
95 * then we send a message back to the TCP which originated the
96 * segment ti, and discard the mbuf containing it and any other
97 * attached mbufs.
98 *
99 * In any case the ack and sequence number of the transmitted
100 * segment are as specified by the parameters.
101 */
102 void
tcp_respond(struct tcpcb * tp,struct tcpiphdr * ti,struct mbuf * m,tcp_seq ack,tcp_seq seq,int flags)103 tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
104 tcp_seq ack, tcp_seq seq, int flags)
105 {
106 register int tlen;
107 int win = 0;
108
109 DEBUG_CALL("tcp_respond");
110 DEBUG_ARG("tp = %lx", (long)tp);
111 DEBUG_ARG("ti = %lx", (long)ti);
112 DEBUG_ARG("m = %lx", (long)m);
113 DEBUG_ARG("ack = %u", ack);
114 DEBUG_ARG("seq = %u", seq);
115 DEBUG_ARG("flags = %x", flags);
116
117 if (tp)
118 win = sbspace(&tp->t_socket->so_rcv);
119 if (m == NULL) {
120 if ((m = m_get()) == NULL)
121 return;
122 #ifdef TCP_COMPAT_42
123 tlen = 1;
124 #else
125 tlen = 0;
126 #endif
127 m->m_data += IF_MAXLINKHDR;
128 *mtod(m, struct tcpiphdr *) = *ti;
129 ti = mtod(m, struct tcpiphdr *);
130 flags = TH_ACK;
131 } else {
132 /*
133 * ti points into m so the next line is just making
134 * the mbuf point to ti
135 */
136 m->m_data = (caddr_t)ti;
137
138 m->m_len = sizeof (struct tcpiphdr);
139 tlen = 0;
140 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
141 xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
142 xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
143 #undef xchg
144 }
145 ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
146 tlen += sizeof (struct tcpiphdr);
147 m->m_len = tlen;
148
149 ti->ti_mbuf = NULL;
150 ti->ti_x1 = 0;
151 ti->ti_seq = htonl(seq);
152 ti->ti_ack = htonl(ack);
153 ti->ti_x2 = 0;
154 ti->ti_off = sizeof (struct tcphdr) >> 2;
155 ti->ti_flags = flags;
156 if (tp)
157 ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
158 else
159 ti->ti_win = htons((u_int16_t)win);
160 ti->ti_urp = 0;
161 ti->ti_sum = 0;
162 ti->ti_sum = cksum(m, tlen);
163 ((struct ip *)ti)->ip_len = tlen;
164
165 if(flags & TH_RST)
166 ((struct ip *)ti)->ip_ttl = MAXTTL;
167 else
168 ((struct ip *)ti)->ip_ttl = IPDEFTTL;
169
170 (void) ip_output((struct socket *)0, m);
171 }
172
173 /*
174 * Create a new TCP control block, making an
175 * empty reassembly queue and hooking it to the argument
176 * protocol control block.
177 */
178 struct tcpcb *
tcp_newtcpcb(struct socket * so)179 tcp_newtcpcb(struct socket *so)
180 {
181 register struct tcpcb *tp;
182
183 tp = (struct tcpcb *)malloc(sizeof(*tp));
184 if (tp == NULL)
185 return ((struct tcpcb *)0);
186
187 memset((char *) tp, 0, sizeof(struct tcpcb));
188 tp->seg_next = tp->seg_prev = (struct tcpiphdr*)tp;
189 tp->t_maxseg = TCP_MSS;
190
191 tp->t_flags = TCP_DO_RFC1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
192 tp->t_socket = so;
193
194 /*
195 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
196 * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
197 * reasonable initial retransmit time.
198 */
199 tp->t_srtt = TCPTV_SRTTBASE;
200 tp->t_rttvar = TCPTV_SRTTDFLT << 2;
201 tp->t_rttmin = TCPTV_MIN;
202
203 TCPT_RANGESET(tp->t_rxtcur,
204 ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
205 TCPTV_MIN, TCPTV_REXMTMAX);
206
207 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
208 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
209 tp->t_state = TCPS_CLOSED;
210
211 so->so_tcpcb = tp;
212
213 return (tp);
214 }
215
216 /*
217 * Drop a TCP connection, reporting
218 * the specified error. If connection is synchronized,
219 * then send a RST to peer.
220 */
tcp_drop(struct tcpcb * tp,int err)221 struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
222 {
223 /* tcp_drop(tp, errno)
224 register struct tcpcb *tp;
225 int errno;
226 {
227 */
228
229 DEBUG_CALL("tcp_drop");
230 DEBUG_ARG("tp = %lx", (long)tp);
231 DEBUG_ARG("errno = %d", errno);
232
233 if (TCPS_HAVERCVDSYN(tp->t_state)) {
234 tp->t_state = TCPS_CLOSED;
235 (void) tcp_output(tp);
236 STAT(tcpstat.tcps_drops++);
237 } else
238 STAT(tcpstat.tcps_conndrops++);
239 /* if (errno == ETIMEDOUT && tp->t_softerror)
240 * errno = tp->t_softerror;
241 */
242 /* so->so_error = errno; */
243 return (tcp_close(tp));
244 }
245
246 /*
247 * Close a TCP control block:
248 * discard all space held by the tcp
249 * discard internet protocol block
250 * wake up any sleepers
251 */
252 struct tcpcb *
tcp_close(struct tcpcb * tp)253 tcp_close(struct tcpcb *tp)
254 {
255 register struct tcpiphdr *t;
256 struct socket *so = tp->t_socket;
257 register struct mbuf *m;
258
259 DEBUG_CALL("tcp_close");
260 DEBUG_ARG("tp = %lx", (long )tp);
261
262 /* free the reassembly queue, if any */
263 t = tcpfrag_list_first(tp);
264 while (!tcpfrag_list_end(t, tp)) {
265 t = tcpiphdr_next(t);
266 m = tcpiphdr_prev(t)->ti_mbuf;
267 remque(tcpiphdr2qlink(tcpiphdr_prev(t)));
268 m_freem(m);
269 }
270 /* It's static */
271 /* if (tp->t_template)
272 * (void) m_free(dtom(tp->t_template));
273 */
274 /* free(tp, M_PCB); */
275 free(tp);
276 so->so_tcpcb = NULL;
277 soisfdisconnected(so);
278 /* clobber input socket cache if we're closing the cached connection */
279 if (so == tcp_last_so)
280 tcp_last_so = &tcb;
281 closesocket(so->s);
282 sbfree(&so->so_rcv);
283 sbfree(&so->so_snd);
284 sofree(so);
285 STAT(tcpstat.tcps_closed++);
286 return ((struct tcpcb *)0);
287 }
288
289 #ifdef notdef
290 void
tcp_drain()291 tcp_drain()
292 {
293 /* XXX */
294 }
295
296 /*
297 * When a source quench is received, close congestion window
298 * to one segment. We will gradually open it again as we proceed.
299 */
300 void
tcp_quench(i,errno)301 tcp_quench(i, errno)
302
303 int errno;
304 {
305 struct tcpcb *tp = intotcpcb(inp);
306
307 if (tp)
308 tp->snd_cwnd = tp->t_maxseg;
309 }
310
311 #endif /* notdef */
312
313 /*
314 * TCP protocol interface to socket abstraction.
315 */
316
317 /*
318 * User issued close, and wish to trail through shutdown states:
319 * if never received SYN, just forget it. If got a SYN from peer,
320 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
321 * If already got a FIN from peer, then almost done; go to LAST_ACK
322 * state. In all other cases, have already sent FIN to peer (e.g.
323 * after PRU_SHUTDOWN), and just have to play tedious game waiting
324 * for peer to send FIN or not respond to keep-alives, etc.
325 * We can let the user exit from the close as soon as the FIN is acked.
326 */
327 void
tcp_sockclosed(struct tcpcb * tp)328 tcp_sockclosed(struct tcpcb *tp)
329 {
330
331 DEBUG_CALL("tcp_sockclosed");
332 DEBUG_ARG("tp = %lx", (long)tp);
333
334 switch (tp->t_state) {
335
336 case TCPS_CLOSED:
337 case TCPS_LISTEN:
338 case TCPS_SYN_SENT:
339 tp->t_state = TCPS_CLOSED;
340 tp = tcp_close(tp);
341 break;
342
343 case TCPS_SYN_RECEIVED:
344 case TCPS_ESTABLISHED:
345 tp->t_state = TCPS_FIN_WAIT_1;
346 break;
347
348 case TCPS_CLOSE_WAIT:
349 tp->t_state = TCPS_LAST_ACK;
350 break;
351 }
352 /* soisfdisconnecting(tp->t_socket); */
353 if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
354 soisfdisconnected(tp->t_socket);
355 if (tp)
356 tcp_output(tp);
357 }
358
359 /*
360 * Connect to a host on the Internet
361 * Called by tcp_input
362 * Only do a connect, the tcp fields will be set in tcp_input
363 * return 0 if there's a result of the connect,
364 * else return -1 means we're still connecting
365 * The return value is almost always -1 since the socket is
366 * nonblocking. Connect returns after the SYN is sent, and does
367 * not wait for ACK+SYN.
368 */
tcp_fconnect(struct socket * so)369 int tcp_fconnect(struct socket *so)
370 {
371 int ret=0;
372
373 DEBUG_CALL("tcp_fconnect");
374 DEBUG_ARG("so = %lx", (long )so);
375
376 if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
377 int opt, s=so->s;
378 struct sockaddr_in addr;
379
380 fd_nonblock(s);
381 opt = 1;
382 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
383 opt = 1;
384 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
385
386 addr.sin_family = AF_INET;
387 if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
388 /* It's an alias */
389 switch(ntohl(so->so_faddr.s_addr) & 0xff) {
390 case CTL_DNS:
391 addr.sin_addr = dns_addr;
392 break;
393 case CTL_ALIAS:
394 default:
395 addr.sin_addr = loopback_addr;
396 break;
397 }
398 } else
399 addr.sin_addr = so->so_faddr;
400 addr.sin_port = so->so_fport;
401
402 DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
403 "addr.sin_addr.s_addr=%.16s\n",
404 ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
405 /* We don't care what port we get */
406 ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
407
408 /*
409 * If it's not in progress, it failed, so we just return 0,
410 * without clearing SS_NOFDREF
411 */
412 soisfconnecting(so);
413 }
414
415 return(ret);
416 }
417
418 /*
419 * Accept the socket and connect to the local-host
420 *
421 * We have a problem. The correct thing to do would be
422 * to first connect to the local-host, and only if the
423 * connection is accepted, then do an accept() here.
424 * But, a) we need to know who's trying to connect
425 * to the socket to be able to SYN the local-host, and
426 * b) we are already connected to the foreign host by
427 * the time it gets to accept(), so... We simply accept
428 * here and SYN the local-host.
429 */
430 void
tcp_connect(struct socket * inso)431 tcp_connect(struct socket *inso)
432 {
433 struct socket *so;
434 struct sockaddr_in addr;
435 socklen_t addrlen = sizeof(struct sockaddr_in);
436 struct tcpcb *tp;
437 int s, opt;
438
439 DEBUG_CALL("tcp_connect");
440 DEBUG_ARG("inso = %lx", (long)inso);
441
442 /*
443 * If it's an SS_ACCEPTONCE socket, no need to socreate()
444 * another socket, just use the accept() socket.
445 */
446 if (inso->so_state & SS_FACCEPTONCE) {
447 /* FACCEPTONCE already have a tcpcb */
448 so = inso;
449 } else {
450 if ((so = socreate()) == NULL) {
451 /* If it failed, get rid of the pending connection */
452 closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
453 return;
454 }
455 if (tcp_attach(so) < 0) {
456 free(so); /* NOT sofree */
457 return;
458 }
459 so->so_laddr = inso->so_laddr;
460 so->so_lport = inso->so_lport;
461 }
462
463 (void) tcp_mss(sototcpcb(so), 0);
464
465 if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
466 tcp_close(sototcpcb(so)); /* This will sofree() as well */
467 return;
468 }
469 fd_nonblock(s);
470 opt = 1;
471 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
472 opt = 1;
473 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
474 opt = 1;
475 setsockopt(s,IPPROTO_TCP,TCP_NODELAY,(char *)&opt,sizeof(int));
476
477 so->so_fport = addr.sin_port;
478 so->so_faddr = addr.sin_addr;
479 /* Translate connections from localhost to the real hostname */
480 if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr)
481 so->so_faddr = alias_addr;
482
483 /* Close the accept() socket, set right state */
484 if (inso->so_state & SS_FACCEPTONCE) {
485 closesocket(so->s); /* If we only accept once, close the accept() socket */
486 so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
487 /* if it's not FACCEPTONCE, it's already NOFDREF */
488 }
489 so->s = s;
490
491 so->so_iptos = tcp_tos(so);
492 tp = sototcpcb(so);
493
494 tcp_template(tp);
495
496 /* Compute window scaling to request. */
497 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
498 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
499 * tp->request_r_scale++;
500 */
501
502 /* soisconnecting(so); */ /* NOFDREF used instead */
503 STAT(tcpstat.tcps_connattempt++);
504
505 tp->t_state = TCPS_SYN_SENT;
506 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
507 tp->iss = tcp_iss;
508 tcp_iss += TCP_ISSINCR/2;
509 tcp_sendseqinit(tp);
510 tcp_output(tp);
511 }
512
513 /*
514 * Attach a TCPCB to a socket.
515 */
516 int
tcp_attach(struct socket * so)517 tcp_attach(struct socket *so)
518 {
519 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
520 return -1;
521
522 insque(so, &tcb);
523
524 return 0;
525 }
526
527 /*
528 * Set the socket's type of service field
529 */
530 static const struct tos_t tcptos[] = {
531 {0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
532 {21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
533 {0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
534 {0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
535 {0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT}, /* rlogin */
536 {0, 514, IPTOS_LOWDELAY, EMU_RSH|EMU_NOCONNECT}, /* shell */
537 {0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
538 {0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
539 {0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
540 {0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
541 {0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
542 {0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
543 {0, 0, 0, 0}
544 };
545
546 #ifdef CONFIG_QEMU
547 static
548 #endif
549 struct emu_t *tcpemu = NULL;
550
551 /*
552 * Return TOS according to the above table
553 */
554 u_int8_t
tcp_tos(struct socket * so)555 tcp_tos(struct socket *so)
556 {
557 int i = 0;
558 struct emu_t *emup;
559
560 while(tcptos[i].tos) {
561 if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
562 (tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
563 so->so_emu = tcptos[i].emu;
564 return tcptos[i].tos;
565 }
566 i++;
567 }
568
569 /* Nope, lets see if there's a user-added one */
570 for (emup = tcpemu; emup; emup = emup->next) {
571 if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
572 (emup->lport && (ntohs(so->so_lport) == emup->lport))) {
573 so->so_emu = emup->emu;
574 return emup->tos;
575 }
576 }
577
578 return 0;
579 }
580
581 #if 0
582 int do_echo = -1;
583 #endif
584
585 /*
586 * Emulate programs that try and connect to us
587 * This includes ftp (the data connection is
588 * initiated by the server) and IRC (DCC CHAT and
589 * DCC SEND) for now
590 *
591 * NOTE: It's possible to crash SLiRP by sending it
592 * unstandard strings to emulate... if this is a problem,
593 * more checks are needed here
594 *
595 * XXX Assumes the whole command came in one packet
596 *
597 * XXX Some ftp clients will have their TOS set to
598 * LOWDELAY and so Nagel will kick in. Because of this,
599 * we'll get the first letter, followed by the rest, so
600 * we simply scan for ORT instead of PORT...
601 * DCC doesn't have this problem because there's other stuff
602 * in the packet before the DCC command.
603 *
604 * Return 1 if the mbuf m is still valid and should be
605 * sbappend()ed
606 *
607 * NOTE: if you return 0 you MUST m_free() the mbuf!
608 */
609 int
tcp_emu(struct socket * so,struct mbuf * m)610 tcp_emu(struct socket *so, struct mbuf *m)
611 {
612 u_int n1, n2, n3, n4, n5, n6;
613 char buff[257];
614 u_int32_t laddr;
615 u_int lport;
616 char *bptr;
617
618 DEBUG_CALL("tcp_emu");
619 DEBUG_ARG("so = %lx", (long)so);
620 DEBUG_ARG("m = %lx", (long)m);
621
622 switch(so->so_emu) {
623 int x, i;
624
625 case EMU_IDENT:
626 /*
627 * Identification protocol as per rfc-1413
628 */
629
630 {
631 struct socket *tmpso;
632 struct sockaddr_in addr;
633 socklen_t addrlen = sizeof(struct sockaddr_in);
634 struct sbuf *so_rcv = &so->so_rcv;
635
636 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
637 so_rcv->sb_wptr += m->m_len;
638 so_rcv->sb_rptr += m->m_len;
639 m->m_data[m->m_len] = 0; /* NULL terminate */
640 if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
641 if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
642 HTONS(n1);
643 HTONS(n2);
644 /* n2 is the one on our host */
645 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
646 if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
647 tmpso->so_lport == n2 &&
648 tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
649 tmpso->so_fport == n1) {
650 if (getsockname(tmpso->s,
651 (struct sockaddr *)&addr, &addrlen) == 0)
652 n2 = ntohs(addr.sin_port);
653 break;
654 }
655 }
656 }
657 so_rcv->sb_cc = snprintf(so_rcv->sb_data,
658 so_rcv->sb_datalen,
659 "%d,%d\r\n", n1, n2);
660 so_rcv->sb_rptr = so_rcv->sb_data;
661 so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
662 }
663 m_free(m);
664 return 0;
665 }
666
667 #if 0
668 case EMU_RLOGIN:
669 /*
670 * Rlogin emulation
671 * First we accumulate all the initial option negotiation,
672 * then fork_exec() rlogin according to the options
673 */
674 {
675 int i, i2, n;
676 char *ptr;
677 char args[100];
678 char term[100];
679 struct sbuf *so_snd = &so->so_snd;
680 struct sbuf *so_rcv = &so->so_rcv;
681
682 /* First check if they have a priveladged port, or too much data has arrived */
683 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
684 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
685 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
686 so_snd->sb_wptr += 18;
687 so_snd->sb_cc += 18;
688 tcp_sockclosed(sototcpcb(so));
689 m_free(m);
690 return 0;
691 }
692
693 /* Append the current data */
694 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
695 so_rcv->sb_wptr += m->m_len;
696 so_rcv->sb_rptr += m->m_len;
697 m_free(m);
698
699 /*
700 * Check if we have all the initial options,
701 * and build argument list to rlogin while we're here
702 */
703 n = 0;
704 ptr = so_rcv->sb_data;
705 args[0] = 0;
706 term[0] = 0;
707 while (ptr < so_rcv->sb_wptr) {
708 if (*ptr++ == 0) {
709 n++;
710 if (n == 2) {
711 sprintf(args, "rlogin -l %s %s",
712 ptr, inet_ntoa(so->so_faddr));
713 } else if (n == 3) {
714 i2 = so_rcv->sb_wptr - ptr;
715 for (i = 0; i < i2; i++) {
716 if (ptr[i] == '/') {
717 ptr[i] = 0;
718 #ifdef HAVE_SETENV
719 sprintf(term, "%s", ptr);
720 #else
721 sprintf(term, "TERM=%s", ptr);
722 #endif
723 ptr[i] = '/';
724 break;
725 }
726 }
727 }
728 }
729 }
730
731 if (n != 4)
732 return 0;
733
734 /* We have it, set our term variable and fork_exec() */
735 #ifdef HAVE_SETENV
736 setenv("TERM", term, 1);
737 #else
738 putenv(term);
739 #endif
740 fork_exec(so, args, 2);
741 term[0] = 0;
742 so->so_emu = 0;
743
744 /* And finally, send the client a 0 character */
745 so_snd->sb_wptr[0] = 0;
746 so_snd->sb_wptr++;
747 so_snd->sb_cc++;
748
749 return 0;
750 }
751
752 case EMU_RSH:
753 /*
754 * rsh emulation
755 * First we accumulate all the initial option negotiation,
756 * then rsh_exec() rsh according to the options
757 */
758 {
759 int n;
760 char *ptr;
761 char *user;
762 char *args;
763 struct sbuf *so_snd = &so->so_snd;
764 struct sbuf *so_rcv = &so->so_rcv;
765
766 /* First check if they have a priveladged port, or too much data has arrived */
767 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
768 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
769 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
770 so_snd->sb_wptr += 18;
771 so_snd->sb_cc += 18;
772 tcp_sockclosed(sototcpcb(so));
773 m_free(m);
774 return 0;
775 }
776
777 /* Append the current data */
778 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
779 so_rcv->sb_wptr += m->m_len;
780 so_rcv->sb_rptr += m->m_len;
781 m_free(m);
782
783 /*
784 * Check if we have all the initial options,
785 * and build argument list to rlogin while we're here
786 */
787 n = 0;
788 ptr = so_rcv->sb_data;
789 user="";
790 args="";
791 if (so->extra==NULL) {
792 struct socket *ns;
793 struct tcpcb* tp;
794 int port=atoi(ptr);
795 if (port <= 0) return 0;
796 if (port > 1023 || port < 512) {
797 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
798 so_snd->sb_wptr += 18;
799 so_snd->sb_cc += 18;
800 tcp_sockclosed(sototcpcb(so));
801 return 0;
802 }
803 if ((ns=socreate()) == NULL)
804 return 0;
805 if (tcp_attach(ns)<0) {
806 free(ns);
807 return 0;
808 }
809
810 ns->so_laddr=so->so_laddr;
811 ns->so_lport=htons(port);
812
813 (void) tcp_mss(sototcpcb(ns), 0);
814
815 ns->so_faddr=so->so_faddr;
816 ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
817
818 if (ns->so_faddr.s_addr == 0 ||
819 ns->so_faddr.s_addr == loopback_addr.s_addr)
820 ns->so_faddr = alias_addr;
821
822 ns->so_iptos = tcp_tos(ns);
823 tp = sototcpcb(ns);
824
825 tcp_template(tp);
826
827 /* Compute window scaling to request. */
828 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
829 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
830 * tp->request_r_scale++;
831 */
832
833 /*soisfconnecting(ns);*/
834
835 STAT(tcpstat.tcps_connattempt++);
836
837 tp->t_state = TCPS_SYN_SENT;
838 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
839 tp->iss = tcp_iss;
840 tcp_iss += TCP_ISSINCR/2;
841 tcp_sendseqinit(tp);
842 tcp_output(tp);
843 so->extra=ns;
844 }
845 while (ptr < so_rcv->sb_wptr) {
846 if (*ptr++ == 0) {
847 n++;
848 if (n == 2) {
849 user=ptr;
850 } else if (n == 3) {
851 args=ptr;
852 }
853 }
854 }
855
856 if (n != 4)
857 return 0;
858
859 rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
860 so->so_emu = 0;
861 so->extra=NULL;
862
863 /* And finally, send the client a 0 character */
864 so_snd->sb_wptr[0] = 0;
865 so_snd->sb_wptr++;
866 so_snd->sb_cc++;
867
868 return 0;
869 }
870
871 case EMU_CTL:
872 {
873 int num;
874 struct sbuf *so_snd = &so->so_snd;
875 struct sbuf *so_rcv = &so->so_rcv;
876
877 /*
878 * If there is binary data here, we save it in so->so_m
879 */
880 if (!so->so_m) {
881 int rxlen;
882 char *rxdata;
883 rxdata=mtod(m, char *);
884 for (rxlen=m->m_len; rxlen; rxlen--) {
885 if (*rxdata++ & 0x80) {
886 so->so_m = m;
887 return 0;
888 }
889 }
890 } /* if(so->so_m==NULL) */
891
892 /*
893 * Append the line
894 */
895 sbappendsb(so_rcv, m);
896
897 /* To avoid going over the edge of the buffer, we reset it */
898 if (so_snd->sb_cc == 0)
899 so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
900
901 /*
902 * A bit of a hack:
903 * If the first packet we get here is 1 byte long, then it
904 * was done in telnet character mode, therefore we must echo
905 * the characters as they come. Otherwise, we echo nothing,
906 * because in linemode, the line is already echoed
907 * XXX two or more control connections won't work
908 */
909 if (do_echo == -1) {
910 if (m->m_len == 1) do_echo = 1;
911 else do_echo = 0;
912 }
913 if (do_echo) {
914 sbappendsb(so_snd, m);
915 m_free(m);
916 tcp_output(sototcpcb(so)); /* XXX */
917 } else
918 m_free(m);
919
920 num = 0;
921 while (num < so->so_rcv.sb_cc) {
922 if (*(so->so_rcv.sb_rptr + num) == '\n' ||
923 *(so->so_rcv.sb_rptr + num) == '\r') {
924 int n;
925
926 *(so_rcv->sb_rptr + num) = 0;
927 if (ctl_password && !ctl_password_ok) {
928 /* Need a password */
929 if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
930 if (strcmp(buff, ctl_password) == 0) {
931 ctl_password_ok = 1;
932 n = sprintf(so_snd->sb_wptr,
933 "Password OK.\r\n");
934 goto do_prompt;
935 }
936 }
937 n = sprintf(so_snd->sb_wptr,
938 "Error: Password required, log on with \"pass PASSWORD\"\r\n");
939 goto do_prompt;
940 }
941 cfg_quitting = 0;
942 n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
943 if (!cfg_quitting) {
944 /* Register the printed data */
945 do_prompt:
946 so_snd->sb_cc += n;
947 so_snd->sb_wptr += n;
948 /* Add prompt */
949 n = sprintf(so_snd->sb_wptr, "Slirp> ");
950 so_snd->sb_cc += n;
951 so_snd->sb_wptr += n;
952 }
953 /* Drop so_rcv data */
954 so_rcv->sb_cc = 0;
955 so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
956 tcp_output(sototcpcb(so)); /* Send the reply */
957 }
958 num++;
959 }
960 return 0;
961 }
962 #endif
963 case EMU_FTP: /* ftp */
964 *(m->m_data+m->m_len) = 0; /* NUL terminate for strstr */
965 if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
966 /*
967 * Need to emulate the PORT command
968 */
969 x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
970 &n1, &n2, &n3, &n4, &n5, &n6, buff);
971 if (x < 6)
972 return 1;
973
974 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
975 lport = htons((n5 << 8) | (n6));
976
977 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
978 return 1;
979
980 n6 = ntohs(so->so_fport);
981
982 n5 = (n6 >> 8) & 0xff;
983 n6 &= 0xff;
984
985 laddr = ntohl(so->so_faddr.s_addr);
986
987 n1 = ((laddr >> 24) & 0xff);
988 n2 = ((laddr >> 16) & 0xff);
989 n3 = ((laddr >> 8) & 0xff);
990 n4 = (laddr & 0xff);
991
992 m->m_len = bptr - m->m_data; /* Adjust length */
993 m->m_len += snprintf(bptr, m->m_hdr.mh_size - m->m_len,
994 "ORT %d,%d,%d,%d,%d,%d\r\n%s",
995 n1, n2, n3, n4, n5, n6, x==7?buff:"");
996 return 1;
997 } else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
998 /*
999 * Need to emulate the PASV response
1000 */
1001 x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
1002 &n1, &n2, &n3, &n4, &n5, &n6, buff);
1003 if (x < 6)
1004 return 1;
1005
1006 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
1007 lport = htons((n5 << 8) | (n6));
1008
1009 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1010 return 1;
1011
1012 n6 = ntohs(so->so_fport);
1013
1014 n5 = (n6 >> 8) & 0xff;
1015 n6 &= 0xff;
1016
1017 laddr = ntohl(so->so_faddr.s_addr);
1018
1019 n1 = ((laddr >> 24) & 0xff);
1020 n2 = ((laddr >> 16) & 0xff);
1021 n3 = ((laddr >> 8) & 0xff);
1022 n4 = (laddr & 0xff);
1023
1024 m->m_len = bptr - m->m_data; /* Adjust length */
1025 m->m_len += snprintf(bptr, m->m_hdr.mh_size - m->m_len,
1026 "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1027 n1, n2, n3, n4, n5, n6, x==7?buff:"");
1028
1029 return 1;
1030 }
1031
1032 return 1;
1033
1034 case EMU_KSH:
1035 /*
1036 * The kshell (Kerberos rsh) and shell services both pass
1037 * a local port port number to carry signals to the server
1038 * and stderr to the client. It is passed at the beginning
1039 * of the connection as a NUL-terminated decimal ASCII string.
1040 */
1041 so->so_emu = 0;
1042 for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1043 if (m->m_data[i] < '0' || m->m_data[i] > '9')
1044 return 1; /* invalid number */
1045 lport *= 10;
1046 lport += m->m_data[i] - '0';
1047 }
1048 if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1049 (so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1050 m->m_len = snprintf(m->m_data, m->m_hdr.mh_size, "%d",
1051 ntohs(so->so_fport)) + 1;
1052 return 1;
1053
1054 case EMU_IRC:
1055 /*
1056 * Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1057 */
1058 *(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */
1059 if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1060 return 1;
1061
1062 /* The %256s is for the broken mIRC */
1063 if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1064 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1065 return 1;
1066
1067 m->m_len = bptr - m->m_data; /* Adjust length */
1068 m->m_len += snprintf(bptr, m->m_hdr.mh_size,
1069 "DCC CHAT chat %lu %u%c\n",
1070 (unsigned long)ntohl(so->so_faddr.s_addr),
1071 ntohs(so->so_fport), 1);
1072 } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1073 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1074 return 1;
1075
1076 m->m_len = bptr - m->m_data; /* Adjust length */
1077 m->m_len += snprintf(bptr, m->m_hdr.mh_size,
1078 "DCC SEND %s %lu %u %u%c\n", buff,
1079 (unsigned long)ntohl(so->so_faddr.s_addr),
1080 ntohs(so->so_fport), n1, 1);
1081 } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1082 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1083 return 1;
1084
1085 m->m_len = bptr - m->m_data; /* Adjust length */
1086 m->m_len += snprintf(bptr, m->m_hdr.mh_size,
1087 "DCC MOVE %s %lu %u %u%c\n", buff,
1088 (unsigned long)ntohl(so->so_faddr.s_addr),
1089 ntohs(so->so_fport), n1, 1);
1090 }
1091 return 1;
1092
1093 case EMU_REALAUDIO:
1094 /*
1095 * RealAudio emulation - JP. We must try to parse the incoming
1096 * data and try to find the two characters that contain the
1097 * port number. Then we redirect an udp port and replace the
1098 * number with the real port we got.
1099 *
1100 * The 1.0 beta versions of the player are not supported
1101 * any more.
1102 *
1103 * A typical packet for player version 1.0 (release version):
1104 *
1105 * 0000:50 4E 41 00 05
1106 * 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....�..g�l�c..P
1107 * 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1108 * 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1109 * 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1110 *
1111 * Now the port number 0x1BD7 is found at offset 0x04 of the
1112 * Now the port number 0x1BD7 is found at offset 0x04 of the
1113 * second packet. This time we received five bytes first and
1114 * then the rest. You never know how many bytes you get.
1115 *
1116 * A typical packet for player version 2.0 (beta):
1117 *
1118 * 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........�.
1119 * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .gux�c..Win2.0.0
1120 * 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1121 * 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1122 * 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1123 *
1124 * Port number 0x1BC1 is found at offset 0x0d.
1125 *
1126 * This is just a horrible switch statement. Variable ra tells
1127 * us where we're going.
1128 */
1129
1130 bptr = m->m_data;
1131 while (bptr < m->m_data + m->m_len) {
1132 u_short p;
1133 static int ra = 0;
1134 char ra_tbl[4];
1135
1136 ra_tbl[0] = 0x50;
1137 ra_tbl[1] = 0x4e;
1138 ra_tbl[2] = 0x41;
1139 ra_tbl[3] = 0;
1140
1141 switch (ra) {
1142 case 0:
1143 case 2:
1144 case 3:
1145 if (*bptr++ != ra_tbl[ra]) {
1146 ra = 0;
1147 continue;
1148 }
1149 break;
1150
1151 case 1:
1152 /*
1153 * We may get 0x50 several times, ignore them
1154 */
1155 if (*bptr == 0x50) {
1156 ra = 1;
1157 bptr++;
1158 continue;
1159 } else if (*bptr++ != ra_tbl[ra]) {
1160 ra = 0;
1161 continue;
1162 }
1163 break;
1164
1165 case 4:
1166 /*
1167 * skip version number
1168 */
1169 bptr++;
1170 break;
1171
1172 case 5:
1173 /*
1174 * The difference between versions 1.0 and
1175 * 2.0 is here. For future versions of
1176 * the player this may need to be modified.
1177 */
1178 if (*(bptr + 1) == 0x02)
1179 bptr += 8;
1180 else
1181 bptr += 4;
1182 break;
1183
1184 case 6:
1185 /* This is the field containing the port
1186 * number that RA-player is listening to.
1187 */
1188 lport = (((u_char*)bptr)[0] << 8)
1189 + ((u_char *)bptr)[1];
1190 if (lport < 6970)
1191 lport += 256; /* don't know why */
1192 if (lport < 6970 || lport > 7170)
1193 return 1; /* failed */
1194
1195 /* try to get udp port between 6970 - 7170 */
1196 for (p = 6970; p < 7071; p++) {
1197 if (udp_listen( htons(p),
1198 so->so_laddr.s_addr,
1199 htons(lport),
1200 SS_FACCEPTONCE)) {
1201 break;
1202 }
1203 }
1204 if (p == 7071)
1205 p = 0;
1206 *(u_char *)bptr++ = (p >> 8) & 0xff;
1207 *(u_char *)bptr++ = p & 0xff;
1208 ra = 0;
1209 return 1; /* port redirected, we're done */
1210 break;
1211
1212 default:
1213 ra = 0;
1214 }
1215 ra++;
1216 }
1217 return 1;
1218
1219 default:
1220 /* Ooops, not emulated, won't call tcp_emu again */
1221 so->so_emu = 0;
1222 return 1;
1223 }
1224 }
1225
1226 /*
1227 * Do misc. config of SLiRP while its running.
1228 * Return 0 if this connections is to be closed, 1 otherwise,
1229 * return 2 if this is a command-line connection
1230 */
1231 int
tcp_ctl(struct socket * so)1232 tcp_ctl(struct socket *so)
1233 {
1234 struct sbuf *sb = &so->so_snd;
1235 int command;
1236 struct ex_list *ex_ptr;
1237 int do_pty;
1238 // struct socket *tmpso;
1239
1240 DEBUG_CALL("tcp_ctl");
1241 DEBUG_ARG("so = %lx", (long )so);
1242
1243 #if 0
1244 /*
1245 * Check if they're authorised
1246 */
1247 if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 || (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1248 sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1249 sb->sb_wptr += sb->sb_cc;
1250 return 0;
1251 }
1252 #endif
1253 command = (ntohl(so->so_faddr.s_addr) & 0xff);
1254
1255 switch(command) {
1256 default: /* Check for exec's */
1257
1258 /*
1259 * Check if it's pty_exec
1260 */
1261 for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1262 if (ex_ptr->ex_fport == so->so_fport &&
1263 command == ex_ptr->ex_addr) {
1264 if (ex_ptr->ex_pty == 3) {
1265 so->s = -1;
1266 so->extra = (void *)ex_ptr->ex_exec;
1267 return 1;
1268 }
1269 do_pty = ex_ptr->ex_pty;
1270 goto do_exec;
1271 }
1272 }
1273
1274 /*
1275 * Nothing bound..
1276 */
1277 /* tcp_fconnect(so); */
1278
1279 /* FALLTHROUGH */
1280 case CTL_ALIAS:
1281 sb->sb_cc = snprintf(sb->sb_wptr, sb->sb_datalen - (sb->sb_wptr - sb->sb_data),
1282 "Error: No application configured.\r\n");
1283 sb->sb_wptr += sb->sb_cc;
1284 return(0);
1285
1286 do_exec:
1287 DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1288 return(fork_exec(so, ex_ptr->ex_exec, do_pty));
1289
1290 #if 0
1291 case CTL_CMD:
1292 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1293 if (tmpso->so_emu == EMU_CTL &&
1294 !(tmpso->so_tcpcb?
1295 (tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK))
1296 :0)) {
1297 /* Ooops, control connection already active */
1298 sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1299 sb->sb_wptr += sb->sb_cc;
1300 return 0;
1301 }
1302 }
1303 so->so_emu = EMU_CTL;
1304 ctl_password_ok = 0;
1305 sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1306 sb->sb_wptr += sb->sb_cc;
1307 do_echo=-1;
1308 return(2);
1309 #endif
1310 }
1311 }
1312