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Move the framebuffer update package out (Alexander Graf)
[qemu/mini2440/sniper_sniper_test.git] / slirp / tcp_subr.c
blobb30dffdc67dfc5653b373d1f69786065bcc71a1e
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 #define WANT_SYS_IOCTL_H
42 #include <slirp.h>
43
44 /* patchable/settable parameters for tcp */
45 /* Don't do rfc1323 performance enhancements */
46 #define TCP_DO_RFC1323 0
47
48 /*
49 * Tcp initialization
50 */
51 void
52 tcp_init()
53 {
54 tcp_iss = 1; /* wrong */
55 tcb.so_next = tcb.so_prev = &tcb;
56 }
57
58 /*
59 * Create template to be used to send tcp packets on a connection.
60 * Call after host entry created, fills
61 * in a skeletal tcp/ip header, minimizing the amount of work
62 * necessary when the connection is used.
63 */
64 /* struct tcpiphdr * */
65 void
66 tcp_template(tp)
67 struct tcpcb *tp;
68 {
69 struct socket *so = tp->t_socket;
70 register struct tcpiphdr *n = &tp->t_template;
71
72 n->ti_mbuf = NULL;
73 n->ti_x1 = 0;
74 n->ti_pr = IPPROTO_TCP;
75 n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
76 n->ti_src = so->so_faddr;
77 n->ti_dst = so->so_laddr;
78 n->ti_sport = so->so_fport;
79 n->ti_dport = so->so_lport;
80
81 n->ti_seq = 0;
82 n->ti_ack = 0;
83 n->ti_x2 = 0;
84 n->ti_off = 5;
85 n->ti_flags = 0;
86 n->ti_win = 0;
87 n->ti_sum = 0;
88 n->ti_urp = 0;
89 }
90
91 /*
92 * Send a single message to the TCP at address specified by
93 * the given TCP/IP header. If m == 0, then we make a copy
94 * of the tcpiphdr at ti and send directly to the addressed host.
95 * This is used to force keep alive messages out using the TCP
96 * template for a connection tp->t_template. If flags are given
97 * then we send a message back to the TCP which originated the
98 * segment ti, and discard the mbuf containing it and any other
99 * attached mbufs.
100 *
101 * In any case the ack and sequence number of the transmitted
102 * segment are as specified by the parameters.
103 */
104 void
105 tcp_respond(tp, ti, m, ack, seq, flags)
106 struct tcpcb *tp;
107 register struct tcpiphdr *ti;
108 register struct mbuf *m;
109 tcp_seq ack, seq;
110 int flags;
111 {
112 register int tlen;
113 int win = 0;
114
115 DEBUG_CALL("tcp_respond");
116 DEBUG_ARG("tp = %lx", (long)tp);
117 DEBUG_ARG("ti = %lx", (long)ti);
118 DEBUG_ARG("m = %lx", (long)m);
119 DEBUG_ARG("ack = %u", ack);
120 DEBUG_ARG("seq = %u", seq);
121 DEBUG_ARG("flags = %x", flags);
122
123 if (tp)
124 win = sbspace(&tp->t_socket->so_rcv);
125 if (m == 0) {
126 if ((m = m_get()) == NULL)
127 return;
128 #ifdef TCP_COMPAT_42
129 tlen = 1;
130 #else
131 tlen = 0;
132 #endif
133 m->m_data += IF_MAXLINKHDR;
134 *mtod(m, struct tcpiphdr *) = *ti;
135 ti = mtod(m, struct tcpiphdr *);
136 flags = TH_ACK;
137 } else {
138 /*
139 * ti points into m so the next line is just making
140 * the mbuf point to ti
141 */
142 m->m_data = (caddr_t)ti;
143
144 m->m_len = sizeof (struct tcpiphdr);
145 tlen = 0;
146 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
147 xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
148 xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
149 #undef xchg
150 }
151 ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
152 tlen += sizeof (struct tcpiphdr);
153 m->m_len = tlen;
154
155 ti->ti_mbuf = 0;
156 ti->ti_x1 = 0;
157 ti->ti_seq = htonl(seq);
158 ti->ti_ack = htonl(ack);
159 ti->ti_x2 = 0;
160 ti->ti_off = sizeof (struct tcphdr) >> 2;
161 ti->ti_flags = flags;
162 if (tp)
163 ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
164 else
165 ti->ti_win = htons((u_int16_t)win);
166 ti->ti_urp = 0;
167 ti->ti_sum = 0;
168 ti->ti_sum = cksum(m, tlen);
169 ((struct ip *)ti)->ip_len = tlen;
170
171 if(flags & TH_RST)
172 ((struct ip *)ti)->ip_ttl = MAXTTL;
173 else
174 ((struct ip *)ti)->ip_ttl = IPDEFTTL;
175
176 (void) ip_output((struct socket *)0, m);
177 }
178
179 /*
180 * Create a new TCP control block, making an
181 * empty reassembly queue and hooking it to the argument
182 * protocol control block.
183 */
184 struct tcpcb *
185 tcp_newtcpcb(so)
186 struct socket *so;
187 {
188 register struct tcpcb *tp;
189
190 tp = (struct tcpcb *)malloc(sizeof(*tp));
191 if (tp == NULL)
192 return ((struct tcpcb *)0);
193
194 memset((char *) tp, 0, sizeof(struct tcpcb));
195 tp->seg_next = tp->seg_prev = (struct tcpiphdr*)tp;
196 tp->t_maxseg = TCP_MSS;
197
198 tp->t_flags = TCP_DO_RFC1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
199 tp->t_socket = so;
200
201 /*
202 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
203 * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
204 * reasonable initial retransmit time.
205 */
206 tp->t_srtt = TCPTV_SRTTBASE;
207 tp->t_rttvar = TCPTV_SRTTDFLT << 2;
208 tp->t_rttmin = TCPTV_MIN;
209
210 TCPT_RANGESET(tp->t_rxtcur,
211 ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
212 TCPTV_MIN, TCPTV_REXMTMAX);
213
214 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
215 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
216 tp->t_state = TCPS_CLOSED;
217
218 so->so_tcpcb = tp;
219
220 return (tp);
221 }
222
223 /*
224 * Drop a TCP connection, reporting
225 * the specified error. If connection is synchronized,
226 * then send a RST to peer.
227 */
228 struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
229 {
230 /* tcp_drop(tp, errno)
231 register struct tcpcb *tp;
232 int errno;
233 {
234 */
235
236 DEBUG_CALL("tcp_drop");
237 DEBUG_ARG("tp = %lx", (long)tp);
238 DEBUG_ARG("errno = %d", errno);
239
240 if (TCPS_HAVERCVDSYN(tp->t_state)) {
241 tp->t_state = TCPS_CLOSED;
242 (void) tcp_output(tp);
243 STAT(tcpstat.tcps_drops++);
244 } else
245 STAT(tcpstat.tcps_conndrops++);
246 /* if (errno == ETIMEDOUT && tp->t_softerror)
247 * errno = tp->t_softerror;
248 */
249 /* so->so_error = errno; */
250 return (tcp_close(tp));
251 }
252
253 /*
254 * Close a TCP control block:
255 * discard all space held by the tcp
256 * discard internet protocol block
257 * wake up any sleepers
258 */
259 struct tcpcb *
260 tcp_close(tp)
261 register struct tcpcb *tp;
262 {
263 register struct tcpiphdr *t;
264 struct socket *so = tp->t_socket;
265 register struct mbuf *m;
266
267 DEBUG_CALL("tcp_close");
268 DEBUG_ARG("tp = %lx", (long )tp);
269
270 /* free the reassembly queue, if any */
271 t = tcpfrag_list_first(tp);
272 while (!tcpfrag_list_end(t, tp)) {
273 t = tcpiphdr_next(t);
274 m = tcpiphdr_prev(t)->ti_mbuf;
275 remque(tcpiphdr2qlink(tcpiphdr_prev(t)));
276 m_freem(m);
277 }
278 /* It's static */
279 /* if (tp->t_template)
280 * (void) m_free(dtom(tp->t_template));
281 */
282 /* free(tp, M_PCB); */
283 free(tp);
284 so->so_tcpcb = 0;
285 soisfdisconnected(so);
286 /* clobber input socket cache if we're closing the cached connection */
287 if (so == tcp_last_so)
288 tcp_last_so = &tcb;
289 closesocket(so->s);
290 sbfree(&so->so_rcv);
291 sbfree(&so->so_snd);
292 sofree(so);
293 STAT(tcpstat.tcps_closed++);
294 return ((struct tcpcb *)0);
295 }
296
297 #ifdef notdef
298 void
299 tcp_drain()
300 {
301 /* XXX */
302 }
303
304 /*
305 * When a source quench is received, close congestion window
306 * to one segment. We will gradually open it again as we proceed.
307 */
308 void
309 tcp_quench(i, errno)
310
311 int errno;
312 {
313 struct tcpcb *tp = intotcpcb(inp);
314
315 if (tp)
316 tp->snd_cwnd = tp->t_maxseg;
317 }
318
319 #endif /* notdef */
320
321 /*
322 * TCP protocol interface to socket abstraction.
323 */
324
325 /*
326 * User issued close, and wish to trail through shutdown states:
327 * if never received SYN, just forget it. If got a SYN from peer,
328 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
329 * If already got a FIN from peer, then almost done; go to LAST_ACK
330 * state. In all other cases, have already sent FIN to peer (e.g.
331 * after PRU_SHUTDOWN), and just have to play tedious game waiting
332 * for peer to send FIN or not respond to keep-alives, etc.
333 * We can let the user exit from the close as soon as the FIN is acked.
334 */
335 void
336 tcp_sockclosed(tp)
337 struct tcpcb *tp;
338 {
339
340 DEBUG_CALL("tcp_sockclosed");
341 DEBUG_ARG("tp = %lx", (long)tp);
342
343 switch (tp->t_state) {
344
345 case TCPS_CLOSED:
346 case TCPS_LISTEN:
347 case TCPS_SYN_SENT:
348 tp->t_state = TCPS_CLOSED;
349 tp = tcp_close(tp);
350 break;
351
352 case TCPS_SYN_RECEIVED:
353 case TCPS_ESTABLISHED:
354 tp->t_state = TCPS_FIN_WAIT_1;
355 break;
356
357 case TCPS_CLOSE_WAIT:
358 tp->t_state = TCPS_LAST_ACK;
359 break;
360 }
361 /* soisfdisconnecting(tp->t_socket); */
362 if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
363 soisfdisconnected(tp->t_socket);
364 if (tp)
365 tcp_output(tp);
366 }
367
368 /*
369 * Connect to a host on the Internet
370 * Called by tcp_input
371 * Only do a connect, the tcp fields will be set in tcp_input
372 * return 0 if there's a result of the connect,
373 * else return -1 means we're still connecting
374 * The return value is almost always -1 since the socket is
375 * nonblocking. Connect returns after the SYN is sent, and does
376 * not wait for ACK+SYN.
377 */
378 int tcp_fconnect(so)
379 struct socket *so;
380 {
381 int ret=0;
382
383 DEBUG_CALL("tcp_fconnect");
384 DEBUG_ARG("so = %lx", (long )so);
385
386 if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
387 int opt, s=so->s;
388 struct sockaddr_in addr;
389
390 fd_nonblock(s);
391 opt = 1;
392 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
393 opt = 1;
394 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
395
396 addr.sin_family = AF_INET;
397 if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
398 /* It's an alias */
399 switch(ntohl(so->so_faddr.s_addr) & 0xff) {
400 case CTL_DNS:
401 addr.sin_addr = dns_addr;
402 break;
403 case CTL_ALIAS:
404 default:
405 addr.sin_addr = loopback_addr;
406 break;
407 }
408 } else
409 addr.sin_addr = so->so_faddr;
410 addr.sin_port = so->so_fport;
411
412 DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
413 "addr.sin_addr.s_addr=%.16s\n",
414 ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
415 /* We don't care what port we get */
416 ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
417
418 /*
419 * If it's not in progress, it failed, so we just return 0,
420 * without clearing SS_NOFDREF
421 */
422 soisfconnecting(so);
423 }
424
425 return(ret);
426 }
427
428 /*
429 * Accept the socket and connect to the local-host
430 *
431 * We have a problem. The correct thing to do would be
432 * to first connect to the local-host, and only if the
433 * connection is accepted, then do an accept() here.
434 * But, a) we need to know who's trying to connect
435 * to the socket to be able to SYN the local-host, and
436 * b) we are already connected to the foreign host by
437 * the time it gets to accept(), so... We simply accept
438 * here and SYN the local-host.
439 */
440 void
441 tcp_connect(inso)
442 struct socket *inso;
443 {
444 struct socket *so;
445 struct sockaddr_in addr;
446 socklen_t addrlen = sizeof(struct sockaddr_in);
447 struct tcpcb *tp;
448 int s, opt;
449
450 DEBUG_CALL("tcp_connect");
451 DEBUG_ARG("inso = %lx", (long)inso);
452
453 /*
454 * If it's an SS_ACCEPTONCE socket, no need to socreate()
455 * another socket, just use the accept() socket.
456 */
457 if (inso->so_state & SS_FACCEPTONCE) {
458 /* FACCEPTONCE already have a tcpcb */
459 so = inso;
460 } else {
461 if ((so = socreate()) == NULL) {
462 /* If it failed, get rid of the pending connection */
463 closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
464 return;
465 }
466 if (tcp_attach(so) < 0) {
467 free(so); /* NOT sofree */
468 return;
469 }
470 so->so_laddr = inso->so_laddr;
471 so->so_lport = inso->so_lport;
472 }
473
474 (void) tcp_mss(sototcpcb(so), 0);
475
476 if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
477 tcp_close(sototcpcb(so)); /* This will sofree() as well */
478 return;
479 }
480 fd_nonblock(s);
481 opt = 1;
482 setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
483 opt = 1;
484 setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
485 opt = 1;
486 setsockopt(s,IPPROTO_TCP,TCP_NODELAY,(char *)&opt,sizeof(int));
487
488 so->so_fport = addr.sin_port;
489 so->so_faddr = addr.sin_addr;
490 /* Translate connections from localhost to the real hostname */
491 if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr)
492 so->so_faddr = alias_addr;
493
494 /* Close the accept() socket, set right state */
495 if (inso->so_state & SS_FACCEPTONCE) {
496 closesocket(so->s); /* If we only accept once, close the accept() socket */
497 so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
498 /* if it's not FACCEPTONCE, it's already NOFDREF */
499 }
500 so->s = s;
501
502 so->so_iptos = tcp_tos(so);
503 tp = sototcpcb(so);
504
505 tcp_template(tp);
506
507 /* Compute window scaling to request. */
508 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
509 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
510 * tp->request_r_scale++;
511 */
512
513 /* soisconnecting(so); */ /* NOFDREF used instead */
514 STAT(tcpstat.tcps_connattempt++);
515
516 tp->t_state = TCPS_SYN_SENT;
517 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
518 tp->iss = tcp_iss;
519 tcp_iss += TCP_ISSINCR/2;
520 tcp_sendseqinit(tp);
521 tcp_output(tp);
522 }
523
524 /*
525 * Attach a TCPCB to a socket.
526 */
527 int
528 tcp_attach(so)
529 struct socket *so;
530 {
531 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
532 return -1;
533
534 insque(so, &tcb);
535
536 return 0;
537 }
538
539 /*
540 * Set the socket's type of service field
541 */
542 static const struct tos_t tcptos[] = {
543 {0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
544 {21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
545 {0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
546 {0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
547 {0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT}, /* rlogin */
548 {0, 514, IPTOS_LOWDELAY, EMU_RSH|EMU_NOCONNECT}, /* shell */
549 {0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
550 {0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
551 {0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
552 {0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
553 {0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
554 {0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
555 {0, 0, 0, 0}
556 };
557
558 #ifdef CONFIG_QEMU
559 static
560 #endif
561 struct emu_t *tcpemu = 0;
562
563 /*
564 * Return TOS according to the above table
565 */
566 u_int8_t
567 tcp_tos(so)
568 struct socket *so;
569 {
570 int i = 0;
571 struct emu_t *emup;
572
573 while(tcptos[i].tos) {
574 if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
575 (tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
576 so->so_emu = tcptos[i].emu;
577 return tcptos[i].tos;
578 }
579 i++;
580 }
581
582 /* Nope, lets see if there's a user-added one */
583 for (emup = tcpemu; emup; emup = emup->next) {
584 if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
585 (emup->lport && (ntohs(so->so_lport) == emup->lport))) {
586 so->so_emu = emup->emu;
587 return emup->tos;
588 }
589 }
590
591 return 0;
592 }
593
594 #if 0
595 int do_echo = -1;
596 #endif
597
598 /*
599 * Emulate programs that try and connect to us
600 * This includes ftp (the data connection is
601 * initiated by the server) and IRC (DCC CHAT and
602 * DCC SEND) for now
603 *
604 * NOTE: It's possible to crash SLiRP by sending it
605 * unstandard strings to emulate... if this is a problem,
606 * more checks are needed here
607 *
608 * XXX Assumes the whole command came in one packet
609 *
610 * XXX Some ftp clients will have their TOS set to
611 * LOWDELAY and so Nagel will kick in. Because of this,
612 * we'll get the first letter, followed by the rest, so
613 * we simply scan for ORT instead of PORT...
614 * DCC doesn't have this problem because there's other stuff
615 * in the packet before the DCC command.
616 *
617 * Return 1 if the mbuf m is still valid and should be
618 * sbappend()ed
619 *
620 * NOTE: if you return 0 you MUST m_free() the mbuf!
621 */
622 int
623 tcp_emu(so, m)
624 struct socket *so;
625 struct mbuf *m;
626 {
627 u_int n1, n2, n3, n4, n5, n6;
628 char buff[257];
629 u_int32_t laddr;
630 u_int lport;
631 char *bptr;
632
633 DEBUG_CALL("tcp_emu");
634 DEBUG_ARG("so = %lx", (long)so);
635 DEBUG_ARG("m = %lx", (long)m);
636
637 switch(so->so_emu) {
638 int x, i;
639
640 case EMU_IDENT:
641 /*
642 * Identification protocol as per rfc-1413
643 */
644
645 {
646 struct socket *tmpso;
647 struct sockaddr_in addr;
648 socklen_t addrlen = sizeof(struct sockaddr_in);
649 struct sbuf *so_rcv = &so->so_rcv;
650
651 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
652 so_rcv->sb_wptr += m->m_len;
653 so_rcv->sb_rptr += m->m_len;
654 m->m_data[m->m_len] = 0; /* NULL terminate */
655 if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
656 if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
657 HTONS(n1);
658 HTONS(n2);
659 /* n2 is the one on our host */
660 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
661 if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
662 tmpso->so_lport == n2 &&
663 tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
664 tmpso->so_fport == n1) {
665 if (getsockname(tmpso->s,
666 (struct sockaddr *)&addr, &addrlen) == 0)
667 n2 = ntohs(addr.sin_port);
668 break;
669 }
670 }
671 }
672 so_rcv->sb_cc = snprintf(so_rcv->sb_data,
673 so_rcv->sb_datalen,
674 "%d,%d\r\n", n1, n2);
675 so_rcv->sb_rptr = so_rcv->sb_data;
676 so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
677 }
678 m_free(m);
679 return 0;
680 }
681
682 #if 0
683 case EMU_RLOGIN:
684 /*
685 * Rlogin emulation
686 * First we accumulate all the initial option negotiation,
687 * then fork_exec() rlogin according to the options
688 */
689 {
690 int i, i2, n;
691 char *ptr;
692 char args[100];
693 char term[100];
694 struct sbuf *so_snd = &so->so_snd;
695 struct sbuf *so_rcv = &so->so_rcv;
696
697 /* First check if they have a priveladged port, or too much data has arrived */
698 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
699 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
700 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
701 so_snd->sb_wptr += 18;
702 so_snd->sb_cc += 18;
703 tcp_sockclosed(sototcpcb(so));
704 m_free(m);
705 return 0;
706 }
707
708 /* Append the current data */
709 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
710 so_rcv->sb_wptr += m->m_len;
711 so_rcv->sb_rptr += m->m_len;
712 m_free(m);
713
714 /*
715 * Check if we have all the initial options,
716 * and build argument list to rlogin while we're here
717 */
718 n = 0;
719 ptr = so_rcv->sb_data;
720 args[0] = 0;
721 term[0] = 0;
722 while (ptr < so_rcv->sb_wptr) {
723 if (*ptr++ == 0) {
724 n++;
725 if (n == 2) {
726 sprintf(args, "rlogin -l %s %s",
727 ptr, inet_ntoa(so->so_faddr));
728 } else if (n == 3) {
729 i2 = so_rcv->sb_wptr - ptr;
730 for (i = 0; i < i2; i++) {
731 if (ptr[i] == '/') {
732 ptr[i] = 0;
733 #ifdef HAVE_SETENV
734 sprintf(term, "%s", ptr);
735 #else
736 sprintf(term, "TERM=%s", ptr);
737 #endif
738 ptr[i] = '/';
739 break;
740 }
741 }
742 }
743 }
744 }
745
746 if (n != 4)
747 return 0;
748
749 /* We have it, set our term variable and fork_exec() */
750 #ifdef HAVE_SETENV
751 setenv("TERM", term, 1);
752 #else
753 putenv(term);
754 #endif
755 fork_exec(so, args, 2);
756 term[0] = 0;
757 so->so_emu = 0;
758
759 /* And finally, send the client a 0 character */
760 so_snd->sb_wptr[0] = 0;
761 so_snd->sb_wptr++;
762 so_snd->sb_cc++;
763
764 return 0;
765 }
766
767 case EMU_RSH:
768 /*
769 * rsh emulation
770 * First we accumulate all the initial option negotiation,
771 * then rsh_exec() rsh according to the options
772 */
773 {
774 int n;
775 char *ptr;
776 char *user;
777 char *args;
778 struct sbuf *so_snd = &so->so_snd;
779 struct sbuf *so_rcv = &so->so_rcv;
780
781 /* First check if they have a priveladged port, or too much data has arrived */
782 if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
783 (m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
784 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
785 so_snd->sb_wptr += 18;
786 so_snd->sb_cc += 18;
787 tcp_sockclosed(sototcpcb(so));
788 m_free(m);
789 return 0;
790 }
791
792 /* Append the current data */
793 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
794 so_rcv->sb_wptr += m->m_len;
795 so_rcv->sb_rptr += m->m_len;
796 m_free(m);
797
798 /*
799 * Check if we have all the initial options,
800 * and build argument list to rlogin while we're here
801 */
802 n = 0;
803 ptr = so_rcv->sb_data;
804 user="";
805 args="";
806 if (so->extra==NULL) {
807 struct socket *ns;
808 struct tcpcb* tp;
809 int port=atoi(ptr);
810 if (port <= 0) return 0;
811 if (port > 1023 || port < 512) {
812 memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
813 so_snd->sb_wptr += 18;
814 so_snd->sb_cc += 18;
815 tcp_sockclosed(sototcpcb(so));
816 return 0;
817 }
818 if ((ns=socreate()) == NULL)
819 return 0;
820 if (tcp_attach(ns)<0) {
821 free(ns);
822 return 0;
823 }
824
825 ns->so_laddr=so->so_laddr;
826 ns->so_lport=htons(port);
827
828 (void) tcp_mss(sototcpcb(ns), 0);
829
830 ns->so_faddr=so->so_faddr;
831 ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */
832
833 if (ns->so_faddr.s_addr == 0 ||
834 ns->so_faddr.s_addr == loopback_addr.s_addr)
835 ns->so_faddr = alias_addr;
836
837 ns->so_iptos = tcp_tos(ns);
838 tp = sototcpcb(ns);
839
840 tcp_template(tp);
841
842 /* Compute window scaling to request. */
843 /* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
844 * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
845 * tp->request_r_scale++;
846 */
847
848 /*soisfconnecting(ns);*/
849
850 STAT(tcpstat.tcps_connattempt++);
851
852 tp->t_state = TCPS_SYN_SENT;
853 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
854 tp->iss = tcp_iss;
855 tcp_iss += TCP_ISSINCR/2;
856 tcp_sendseqinit(tp);
857 tcp_output(tp);
858 so->extra=ns;
859 }
860 while (ptr < so_rcv->sb_wptr) {
861 if (*ptr++ == 0) {
862 n++;
863 if (n == 2) {
864 user=ptr;
865 } else if (n == 3) {
866 args=ptr;
867 }
868 }
869 }
870
871 if (n != 4)
872 return 0;
873
874 rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args);
875 so->so_emu = 0;
876 so->extra=NULL;
877
878 /* And finally, send the client a 0 character */
879 so_snd->sb_wptr[0] = 0;
880 so_snd->sb_wptr++;
881 so_snd->sb_cc++;
882
883 return 0;
884 }
885
886 case EMU_CTL:
887 {
888 int num;
889 struct sbuf *so_snd = &so->so_snd;
890 struct sbuf *so_rcv = &so->so_rcv;
891
892 /*
893 * If there is binary data here, we save it in so->so_m
894 */
895 if (!so->so_m) {
896 int rxlen;
897 char *rxdata;
898 rxdata=mtod(m, char *);
899 for (rxlen=m->m_len; rxlen; rxlen--) {
900 if (*rxdata++ & 0x80) {
901 so->so_m = m;
902 return 0;
903 }
904 }
905 } /* if(so->so_m==NULL) */
906
907 /*
908 * Append the line
909 */
910 sbappendsb(so_rcv, m);
911
912 /* To avoid going over the edge of the buffer, we reset it */
913 if (so_snd->sb_cc == 0)
914 so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data;
915
916 /*
917 * A bit of a hack:
918 * If the first packet we get here is 1 byte long, then it
919 * was done in telnet character mode, therefore we must echo
920 * the characters as they come. Otherwise, we echo nothing,
921 * because in linemode, the line is already echoed
922 * XXX two or more control connections won't work
923 */
924 if (do_echo == -1) {
925 if (m->m_len == 1) do_echo = 1;
926 else do_echo = 0;
927 }
928 if (do_echo) {
929 sbappendsb(so_snd, m);
930 m_free(m);
931 tcp_output(sototcpcb(so)); /* XXX */
932 } else
933 m_free(m);
934
935 num = 0;
936 while (num < so->so_rcv.sb_cc) {
937 if (*(so->so_rcv.sb_rptr + num) == '\n' ||
938 *(so->so_rcv.sb_rptr + num) == '\r') {
939 int n;
940
941 *(so_rcv->sb_rptr + num) = 0;
942 if (ctl_password && !ctl_password_ok) {
943 /* Need a password */
944 if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) {
945 if (strcmp(buff, ctl_password) == 0) {
946 ctl_password_ok = 1;
947 n = sprintf(so_snd->sb_wptr,
948 "Password OK.\r\n");
949 goto do_prompt;
950 }
951 }
952 n = sprintf(so_snd->sb_wptr,
953 "Error: Password required, log on with \"pass PASSWORD\"\r\n");
954 goto do_prompt;
955 }
956 cfg_quitting = 0;
957 n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF);
958 if (!cfg_quitting) {
959 /* Register the printed data */
960 do_prompt:
961 so_snd->sb_cc += n;
962 so_snd->sb_wptr += n;
963 /* Add prompt */
964 n = sprintf(so_snd->sb_wptr, "Slirp> ");
965 so_snd->sb_cc += n;
966 so_snd->sb_wptr += n;
967 }
968 /* Drop so_rcv data */
969 so_rcv->sb_cc = 0;
970 so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data;
971 tcp_output(sototcpcb(so)); /* Send the reply */
972 }
973 num++;
974 }
975 return 0;
976 }
977 #endif
978 case EMU_FTP: /* ftp */
979 *(m->m_data+m->m_len) = 0; /* NULL terminate for strstr */
980 if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
981 /*
982 * Need to emulate the PORT command
983 */
984 x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
985 &n1, &n2, &n3, &n4, &n5, &n6, buff);
986 if (x < 6)
987 return 1;
988
989 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
990 lport = htons((n5 << 8) | (n6));
991
992 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
993 return 1;
994
995 n6 = ntohs(so->so_fport);
996
997 n5 = (n6 >> 8) & 0xff;
998 n6 &= 0xff;
999
1000 laddr = ntohl(so->so_faddr.s_addr);
1001
1002 n1 = ((laddr >> 24) & 0xff);
1003 n2 = ((laddr >> 16) & 0xff);
1004 n3 = ((laddr >> 8) & 0xff);
1005 n4 = (laddr & 0xff);
1006
1007 m->m_len = bptr - m->m_data; /* Adjust length */
1008 m->m_len += snprintf(bptr, m->m_hdr.mh_size - m->m_len,
1009 "ORT %d,%d,%d,%d,%d,%d\r\n%s",
1010 n1, n2, n3, n4, n5, n6, x==7?buff:"");
1011 return 1;
1012 } else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
1013 /*
1014 * Need to emulate the PASV response
1015 */
1016 x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
1017 &n1, &n2, &n3, &n4, &n5, &n6, buff);
1018 if (x < 6)
1019 return 1;
1020
1021 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
1022 lport = htons((n5 << 8) | (n6));
1023
1024 if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
1025 return 1;
1026
1027 n6 = ntohs(so->so_fport);
1028
1029 n5 = (n6 >> 8) & 0xff;
1030 n6 &= 0xff;
1031
1032 laddr = ntohl(so->so_faddr.s_addr);
1033
1034 n1 = ((laddr >> 24) & 0xff);
1035 n2 = ((laddr >> 16) & 0xff);
1036 n3 = ((laddr >> 8) & 0xff);
1037 n4 = (laddr & 0xff);
1038
1039 m->m_len = bptr - m->m_data; /* Adjust length */
1040 m->m_len += snprintf(bptr, m->m_hdr.mh_size - m->m_len,
1041 "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
1042 n1, n2, n3, n4, n5, n6, x==7?buff:"");
1043
1044 return 1;
1045 }
1046
1047 return 1;
1048
1049 case EMU_KSH:
1050 /*
1051 * The kshell (Kerberos rsh) and shell services both pass
1052 * a local port port number to carry signals to the server
1053 * and stderr to the client. It is passed at the beginning
1054 * of the connection as a NUL-terminated decimal ASCII string.
1055 */
1056 so->so_emu = 0;
1057 for (lport = 0, i = 0; i < m->m_len-1; ++i) {
1058 if (m->m_data[i] < '0' || m->m_data[i] > '9')
1059 return 1; /* invalid number */
1060 lport *= 10;
1061 lport += m->m_data[i] - '0';
1062 }
1063 if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
1064 (so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
1065 m->m_len = snprintf(m->m_data, m->m_hdr.mh_size, "%d",
1066 ntohs(so->so_fport)) + 1;
1067 return 1;
1068
1069 case EMU_IRC:
1070 /*
1071 * Need to emulate DCC CHAT, DCC SEND and DCC MOVE
1072 */
1073 *(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */
1074 if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
1075 return 1;
1076
1077 /* The %256s is for the broken mIRC */
1078 if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
1079 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1080 return 1;
1081
1082 m->m_len = bptr - m->m_data; /* Adjust length */
1083 m->m_len += snprintf(bptr, m->m_hdr.mh_size,
1084 "DCC CHAT chat %lu %u%c\n",
1085 (unsigned long)ntohl(so->so_faddr.s_addr),
1086 ntohs(so->so_fport), 1);
1087 } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1088 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1089 return 1;
1090
1091 m->m_len = bptr - m->m_data; /* Adjust length */
1092 m->m_len += snprintf(bptr, m->m_hdr.mh_size,
1093 "DCC SEND %s %lu %u %u%c\n", buff,
1094 (unsigned long)ntohl(so->so_faddr.s_addr),
1095 ntohs(so->so_fport), n1, 1);
1096 } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
1097 if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
1098 return 1;
1099
1100 m->m_len = bptr - m->m_data; /* Adjust length */
1101 m->m_len += snprintf(bptr, m->m_hdr.mh_size,
1102 "DCC MOVE %s %lu %u %u%c\n", buff,
1103 (unsigned long)ntohl(so->so_faddr.s_addr),
1104 ntohs(so->so_fport), n1, 1);
1105 }
1106 return 1;
1107
1108 case EMU_REALAUDIO:
1109 /*
1110 * RealAudio emulation - JP. We must try to parse the incoming
1111 * data and try to find the two characters that contain the
1112 * port number. Then we redirect an udp port and replace the
1113 * number with the real port we got.
1114 *
1115 * The 1.0 beta versions of the player are not supported
1116 * any more.
1117 *
1118 * A typical packet for player version 1.0 (release version):
1119 *
1120 * 0000:50 4E 41 00 05
1121 * 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....×..gælÜc..P
1122 * 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
1123 * 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
1124 * 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
1125 *
1126 * Now the port number 0x1BD7 is found at offset 0x04 of the
1127 * Now the port number 0x1BD7 is found at offset 0x04 of the
1128 * second packet. This time we received five bytes first and
1129 * then the rest. You never know how many bytes you get.
1130 *
1131 * A typical packet for player version 2.0 (beta):
1132 *
1133 * 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........Á.
1134 * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..Win2.0.0
1135 * 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
1136 * 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
1137 * 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
1138 *
1139 * Port number 0x1BC1 is found at offset 0x0d.
1140 *
1141 * This is just a horrible switch statement. Variable ra tells
1142 * us where we're going.
1143 */
1144
1145 bptr = m->m_data;
1146 while (bptr < m->m_data + m->m_len) {
1147 u_short p;
1148 static int ra = 0;
1149 char ra_tbl[4];
1150
1151 ra_tbl[0] = 0x50;
1152 ra_tbl[1] = 0x4e;
1153 ra_tbl[2] = 0x41;
1154 ra_tbl[3] = 0;
1155
1156 switch (ra) {
1157 case 0:
1158 case 2:
1159 case 3:
1160 if (*bptr++ != ra_tbl[ra]) {
1161 ra = 0;
1162 continue;
1163 }
1164 break;
1165
1166 case 1:
1167 /*
1168 * We may get 0x50 several times, ignore them
1169 */
1170 if (*bptr == 0x50) {
1171 ra = 1;
1172 bptr++;
1173 continue;
1174 } else if (*bptr++ != ra_tbl[ra]) {
1175 ra = 0;
1176 continue;
1177 }
1178 break;
1179
1180 case 4:
1181 /*
1182 * skip version number
1183 */
1184 bptr++;
1185 break;
1186
1187 case 5:
1188 /*
1189 * The difference between versions 1.0 and
1190 * 2.0 is here. For future versions of
1191 * the player this may need to be modified.
1192 */
1193 if (*(bptr + 1) == 0x02)
1194 bptr += 8;
1195 else
1196 bptr += 4;
1197 break;
1198
1199 case 6:
1200 /* This is the field containing the port
1201 * number that RA-player is listening to.
1202 */
1203 lport = (((u_char*)bptr)[0] << 8)
1204 + ((u_char *)bptr)[1];
1205 if (lport < 6970)
1206 lport += 256; /* don't know why */
1207 if (lport < 6970 || lport > 7170)
1208 return 1; /* failed */
1209
1210 /* try to get udp port between 6970 - 7170 */
1211 for (p = 6970; p < 7071; p++) {
1212 if (udp_listen( htons(p),
1213 so->so_laddr.s_addr,
1214 htons(lport),
1215 SS_FACCEPTONCE)) {
1216 break;
1217 }
1218 }
1219 if (p == 7071)
1220 p = 0;
1221 *(u_char *)bptr++ = (p >> 8) & 0xff;
1222 *(u_char *)bptr++ = p & 0xff;
1223 ra = 0;
1224 return 1; /* port redirected, we're done */
1225 break;
1226
1227 default:
1228 ra = 0;
1229 }
1230 ra++;
1231 }
1232 return 1;
1233
1234 default:
1235 /* Ooops, not emulated, won't call tcp_emu again */
1236 so->so_emu = 0;
1237 return 1;
1238 }
1239 }
1240
1241 /*
1242 * Do misc. config of SLiRP while its running.
1243 * Return 0 if this connections is to be closed, 1 otherwise,
1244 * return 2 if this is a command-line connection
1245 */
1246 int
1247 tcp_ctl(so)
1248 struct socket *so;
1249 {
1250 struct sbuf *sb = &so->so_snd;
1251 int command;
1252 struct ex_list *ex_ptr;
1253 int do_pty;
1254 // struct socket *tmpso;
1255
1256 DEBUG_CALL("tcp_ctl");
1257 DEBUG_ARG("so = %lx", (long )so);
1258
1259 #if 0
1260 /*
1261 * Check if they're authorised
1262 */
1263 if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 || (so->so_laddr.s_addr != ctl_addr.s_addr))) {
1264 sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
1265 sb->sb_wptr += sb->sb_cc;
1266 return 0;
1267 }
1268 #endif
1269 command = (ntohl(so->so_faddr.s_addr) & 0xff);
1270
1271 switch(command) {
1272 default: /* Check for exec's */
1273
1274 /*
1275 * Check if it's pty_exec
1276 */
1277 for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
1278 if (ex_ptr->ex_fport == so->so_fport &&
1279 command == ex_ptr->ex_addr) {
1280 if (ex_ptr->ex_pty == 3) {
1281 so->s = -1;
1282 so->extra = (void *)ex_ptr->ex_exec;
1283 return 1;
1284 }
1285 do_pty = ex_ptr->ex_pty;
1286 goto do_exec;
1287 }
1288 }
1289
1290 /*
1291 * Nothing bound..
1292 */
1293 /* tcp_fconnect(so); */
1294
1295 /* FALLTHROUGH */
1296 case CTL_ALIAS:
1297 sb->sb_cc = snprintf(sb->sb_wptr, sb->sb_datalen - (sb->sb_wptr - sb->sb_data),
1298 "Error: No application configured.\r\n");
1299 sb->sb_wptr += sb->sb_cc;
1300 return(0);
1301
1302 do_exec:
1303 DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
1304 return(fork_exec(so, ex_ptr->ex_exec, do_pty));
1305
1306 #if 0
1307 case CTL_CMD:
1308 for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1309 if (tmpso->so_emu == EMU_CTL &&
1310 !(tmpso->so_tcpcb?
1311 (tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK))
1312 :0)) {
1313 /* Ooops, control connection already active */
1314 sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1315 sb->sb_wptr += sb->sb_cc;
1316 return 0;
1317 }
1318 }
1319 so->so_emu = EMU_CTL;
1320 ctl_password_ok = 0;
1321 sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1322 sb->sb_wptr += sb->sb_cc;
1323 do_echo=-1;
1324 return(2);
1325 #endif
1326 }
1327 }