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1.1 root 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 <stdlib.h>
43: #include <slirp.h>
44:
45: /* patchable/settable parameters for tcp */
46: int tcp_mssdflt = TCP_MSS;
47: int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
48: int tcp_do_rfc1323 = 0; /* Don't do rfc1323 performance enhancements */
49: int tcp_rcvspace; /* You may want to change this */
50: int tcp_sndspace; /* Keep small if you have an error prone link */
51:
52: /*
53: * Tcp initialization
54: */
55: void
56: tcp_init()
57: {
58: tcp_iss = 1; /* wrong */
59: tcb.so_next = tcb.so_prev = &tcb;
60:
61: /* tcp_rcvspace = our Window we advertise to the remote */
62: tcp_rcvspace = TCP_RCVSPACE;
63: tcp_sndspace = TCP_SNDSPACE;
64:
65: /* Make sure tcp_sndspace is at least 2*MSS */
66: if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
67: tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
68: }
69:
70: /*
71: * Create template to be used to send tcp packets on a connection.
72: * Call after host entry created, fills
73: * in a skeletal tcp/ip header, minimizing the amount of work
74: * necessary when the connection is used.
75: */
76: /* struct tcpiphdr * */
77: void
78: tcp_template(tp)
79: struct tcpcb *tp;
80: {
81: struct socket *so = tp->t_socket;
82: register struct tcpiphdr *n = &tp->t_template;
83:
84: n->ti_mbuf = NULL;
85: n->ti_x1 = 0;
86: n->ti_pr = IPPROTO_TCP;
87: n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
88: n->ti_src = so->so_faddr;
89: n->ti_dst = so->so_laddr;
90: n->ti_sport = so->so_fport;
91: n->ti_dport = so->so_lport;
92:
93: n->ti_seq = 0;
94: n->ti_ack = 0;
95: n->ti_x2 = 0;
96: n->ti_off = 5;
97: n->ti_flags = 0;
98: n->ti_win = 0;
99: n->ti_sum = 0;
100: n->ti_urp = 0;
101: }
102:
103: /*
104: * Send a single message to the TCP at address specified by
105: * the given TCP/IP header. If m == 0, then we make a copy
106: * of the tcpiphdr at ti and send directly to the addressed host.
107: * This is used to force keep alive messages out using the TCP
108: * template for a connection tp->t_template. If flags are given
109: * then we send a message back to the TCP which originated the
110: * segment ti, and discard the mbuf containing it and any other
111: * attached mbufs.
112: *
113: * In any case the ack and sequence number of the transmitted
114: * segment are as specified by the parameters.
115: */
116: void
117: tcp_respond(tp, ti, m, ack, seq, flags)
118: struct tcpcb *tp;
119: register struct tcpiphdr *ti;
120: register struct mbuf *m;
121: tcp_seq ack, seq;
122: int flags;
123: {
124: register int tlen;
125: int win = 0;
126:
127: DEBUG_CALL("tcp_respond");
128: DEBUG_ARG("tp = %lx", (long)tp);
129: DEBUG_ARG("ti = %lx", (long)ti);
130: DEBUG_ARG("m = %lx", (long)m);
131: DEBUG_ARG("ack = %u", ack);
132: DEBUG_ARG("seq = %u", seq);
133: DEBUG_ARG("flags = %x", flags);
134:
135: if (tp)
136: win = sbspace(&tp->t_socket->so_rcv);
137: if (m == 0) {
138: if ((m = m_get()) == NULL)
139: return;
140: #ifdef TCP_COMPAT_42
141: tlen = 1;
142: #else
143: tlen = 0;
144: #endif
145: m->m_data += if_maxlinkhdr;
146: *mtod(m, struct tcpiphdr *) = *ti;
147: ti = mtod(m, struct tcpiphdr *);
148: flags = TH_ACK;
149: } else {
150: /*
151: * ti points into m so the next line is just making
152: * the mbuf point to ti
153: */
154: m->m_data = (caddr_t)ti;
155:
156: m->m_len = sizeof (struct tcpiphdr);
157: tlen = 0;
158: #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
159: xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
160: xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
161: #undef xchg
162: }
163: ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
164: tlen += sizeof (struct tcpiphdr);
165: m->m_len = tlen;
166:
167: ti->ti_mbuf = 0;
168: ti->ti_x1 = 0;
169: ti->ti_seq = htonl(seq);
170: ti->ti_ack = htonl(ack);
171: ti->ti_x2 = 0;
172: ti->ti_off = sizeof (struct tcphdr) >> 2;
173: ti->ti_flags = flags;
174: if (tp)
175: ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
176: else
177: ti->ti_win = htons((u_int16_t)win);
178: ti->ti_urp = 0;
179: ti->ti_sum = 0;
180: ti->ti_sum = cksum(m, tlen);
181: ((struct ip *)ti)->ip_len = tlen;
182:
183: if(flags & TH_RST)
184: ((struct ip *)ti)->ip_ttl = MAXTTL;
185: else
186: ((struct ip *)ti)->ip_ttl = ip_defttl;
187:
188: (void) ip_output((struct socket *)0, m);
189: }
190:
191: /*
192: * Create a new TCP control block, making an
193: * empty reassembly queue and hooking it to the argument
194: * protocol control block.
195: */
196: struct tcpcb *
197: tcp_newtcpcb(so)
198: struct socket *so;
199: {
200: register struct tcpcb *tp;
201:
202: tp = (struct tcpcb *)malloc(sizeof(*tp));
203: if (tp == NULL)
204: return ((struct tcpcb *)0);
205:
206: memset((char *) tp, 0, sizeof(struct tcpcb));
207: tp->seg_next = tp->seg_prev = (struct tcpiphdr*)tp;
208: tp->t_maxseg = tcp_mssdflt;
209:
210: tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
211: tp->t_socket = so;
212:
213: /*
214: * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
215: * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
216: * reasonable initial retransmit time.
217: */
218: tp->t_srtt = TCPTV_SRTTBASE;
219: tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
220: tp->t_rttmin = TCPTV_MIN;
221:
222: TCPT_RANGESET(tp->t_rxtcur,
223: ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
224: TCPTV_MIN, TCPTV_REXMTMAX);
225:
226: tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
227: tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
228: tp->t_state = TCPS_CLOSED;
229:
230: so->so_tcpcb = tp;
231:
232: return (tp);
233: }
234:
235: /*
236: * Drop a TCP connection, reporting
237: * the specified error. If connection is synchronized,
238: * then send a RST to peer.
239: */
240: struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
241: {
242: /* tcp_drop(tp, errno)
243: register struct tcpcb *tp;
244: int errno;
245: {
246: */
247:
248: DEBUG_CALL("tcp_drop");
249: DEBUG_ARG("tp = %lx", (long)tp);
250: DEBUG_ARG("errno = %d", errno);
251:
252: if (TCPS_HAVERCVDSYN(tp->t_state)) {
253: tp->t_state = TCPS_CLOSED;
254: (void) tcp_output(tp);
255: tcpstat.tcps_drops++;
256: } else
257: tcpstat.tcps_conndrops++;
258: /* if (errno == ETIMEDOUT && tp->t_softerror)
259: * errno = tp->t_softerror;
260: */
261: /* so->so_error = errno; */
262: return (tcp_close(tp));
263: }
264:
265: /*
266: * Close a TCP control block:
267: * discard all space held by the tcp
268: * discard internet protocol block
269: * wake up any sleepers
270: */
271: struct tcpcb *
272: tcp_close(tp)
273: register struct tcpcb *tp;
274: {
275: register struct tcpiphdr *t;
276: struct socket *so = tp->t_socket;
277: register struct mbuf *m;
278:
279: DEBUG_CALL("tcp_close");
280: DEBUG_ARG("tp = %lx", (long )tp);
281:
282: /* free the reassembly queue, if any */
283: t = tcpfrag_list_first(tp);
284: while (!tcpfrag_list_end(t, tp)) {
285: t = tcpiphdr_next(t);
286: m = tcpiphdr_prev(t)->ti_mbuf;
287: remque(tcpiphdr2qlink(tcpiphdr_prev(t)));
288: m_freem(m);
289: }
290: /* It's static */
291: /* if (tp->t_template)
292: * (void) m_free(dtom(tp->t_template));
293: */
294: /* free(tp, M_PCB); */
295: free(tp);
296: so->so_tcpcb = 0;
297: soisfdisconnected(so);
298: /* clobber input socket cache if we're closing the cached connection */
299: if (so == tcp_last_so)
300: tcp_last_so = &tcb;
301: closesocket(so->s);
302: sbfree(&so->so_rcv);
303: sbfree(&so->so_snd);
304: sofree(so);
305: tcpstat.tcps_closed++;
306: return ((struct tcpcb *)0);
307: }
308:
309: void
310: tcp_drain()
311: {
312: /* XXX */
313: }
314:
315: /*
316: * When a source quench is received, close congestion window
317: * to one segment. We will gradually open it again as we proceed.
318: */
319:
320: #ifdef notdef
321:
322: void
323: tcp_quench(i, errno)
324:
325: int errno;
326: {
327: struct tcpcb *tp = intotcpcb(inp);
328:
329: if (tp)
330: tp->snd_cwnd = tp->t_maxseg;
331: }
332:
333: #endif /* notdef */
334:
335: /*
336: * TCP protocol interface to socket abstraction.
337: */
338:
339: /*
340: * User issued close, and wish to trail through shutdown states:
341: * if never received SYN, just forget it. If got a SYN from peer,
342: * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
343: * If already got a FIN from peer, then almost done; go to LAST_ACK
344: * state. In all other cases, have already sent FIN to peer (e.g.
345: * after PRU_SHUTDOWN), and just have to play tedious game waiting
346: * for peer to send FIN or not respond to keep-alives, etc.
347: * We can let the user exit from the close as soon as the FIN is acked.
348: */
349: void
350: tcp_sockclosed(tp)
351: struct tcpcb *tp;
352: {
353:
354: DEBUG_CALL("tcp_sockclosed");
355: DEBUG_ARG("tp = %lx", (long)tp);
356:
357: switch (tp->t_state) {
358:
359: case TCPS_CLOSED:
360: case TCPS_LISTEN:
361: case TCPS_SYN_SENT:
362: tp->t_state = TCPS_CLOSED;
363: tp = tcp_close(tp);
364: break;
365:
366: case TCPS_SYN_RECEIVED:
367: case TCPS_ESTABLISHED:
368: tp->t_state = TCPS_FIN_WAIT_1;
369: break;
370:
371: case TCPS_CLOSE_WAIT:
372: tp->t_state = TCPS_LAST_ACK;
373: break;
374: }
375: /* soisfdisconnecting(tp->t_socket); */
376: if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
377: soisfdisconnected(tp->t_socket);
378: if (tp)
379: tcp_output(tp);
380: }
381:
382: /*
383: * Connect to a host on the Internet
384: * Called by tcp_input
385: * Only do a connect, the tcp fields will be set in tcp_input
386: * return 0 if there's a result of the connect,
387: * else return -1 means we're still connecting
388: * The return value is almost always -1 since the socket is
389: * nonblocking. Connect returns after the SYN is sent, and does
390: * not wait for ACK+SYN.
391: */
392: int tcp_fconnect(so)
393: struct socket *so;
394: {
395: int ret=0;
396:
397: DEBUG_CALL("tcp_fconnect");
398: DEBUG_ARG("so = %lx", (long )so);
399:
400: if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) {
401: int opt, s=so->s;
402: struct sockaddr_in addr;
403: memset(&addr, 0, sizeof(struct sockaddr_in));
404:
405: fd_nonblock(s);
406: opt = 1;
407: setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
408: opt = 1;
409: setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
410:
411: addr.sin_family = AF_INET;
412: if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
413: /* It's an alias */
414: switch(ntohl(so->so_faddr.s_addr) & 0xff) {
415: case CTL_DNS:
416: addr.sin_addr = dns_addr;
417: break;
418: case CTL_ALIAS:
419: default:
420: addr.sin_addr = loopback_addr;
421: break;
422: }
423: } else
424: addr.sin_addr = so->so_faddr;
425: addr.sin_port = so->so_fport;
426:
427: DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
428: "addr.sin_addr.s_addr=%.16s\n",
429: ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
430: /* We don't care what port we get */
431: ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
432:
433: /*
434: * If it's not in progress, it failed, so we just return 0,
435: * without clearing SS_NOFDREF
436: */
437: soisfconnecting(so);
438: }
439:
440: return(ret);
441: }
442:
443: /*
444: * Accept the socket and connect to the local-host
445: *
446: * We have a problem. The correct thing to do would be
447: * to first connect to the local-host, and only if the
448: * connection is accepted, then do an accept() here.
449: * But, a) we need to know who's trying to connect
450: * to the socket to be able to SYN the local-host, and
451: * b) we are already connected to the foreign host by
452: * the time it gets to accept(), so... We simply accept
453: * here and SYN the local-host.
454: */
455: void
456: tcp_connect(inso)
457: struct socket *inso;
458: {
459: struct socket *so;
460: struct sockaddr_in addr;
461: socklen_t addrlen = sizeof(struct sockaddr_in);
462: struct tcpcb *tp;
463: int s, opt;
464:
465: DEBUG_CALL("tcp_connect");
466: DEBUG_ARG("inso = %lx", (long)inso);
467:
468: /*
469: * If it's an SS_ACCEPTONCE socket, no need to socreate()
470: * another socket, just use the accept() socket.
471: */
472: if (inso->so_state & SS_FACCEPTONCE) {
473: /* FACCEPTONCE already have a tcpcb */
474: so = inso;
475: } else {
476: if ((so = socreate()) == NULL) {
477: /* If it failed, get rid of the pending connection */
478: closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
479: return;
480: }
481: if (tcp_attach(so) < 0) {
482: free(so); /* NOT sofree */
483: return;
484: }
485: so->so_laddr = inso->so_laddr;
486: so->so_lport = inso->so_lport;
487: }
488:
489: (void) tcp_mss(sototcpcb(so), 0);
490:
491: if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
492: tcp_close(sototcpcb(so)); /* This will sofree() as well */
493: return;
494: }
495: fd_nonblock(s);
496: opt = 1;
497: setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
498: opt = 1;
499: setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
500: opt = 1;
501: setsockopt(s,IPPROTO_TCP,TCP_NODELAY,(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 = alias_addr;
508:
509: /* Close the accept() socket, set right state */
510: if (inso->so_state & SS_FACCEPTONCE) {
511: closesocket(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
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
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
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: socklen_t 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 = alias_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
1249: tcp_ctl(so)
1250: struct socket *so;
1251: {
1252: struct sbuf *sb = &so->so_snd;
1253: int command;
1254: struct ex_list *ex_ptr;
1255: int do_pty;
1256: // struct socket *tmpso;
1257:
1258: DEBUG_CALL("tcp_ctl");
1259: DEBUG_ARG("so = %lx", (long )so);
1260:
1261: #if 0
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: #endif
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: #if 0
1304: case CTL_CMD:
1305: for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
1306: if (tmpso->so_emu == EMU_CTL &&
1307: !(tmpso->so_tcpcb?
1308: (tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK))
1309: :0)) {
1310: /* Ooops, control connection already active */
1311: sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
1312: sb->sb_wptr += sb->sb_cc;
1313: return 0;
1314: }
1315: }
1316: so->so_emu = EMU_CTL;
1317: ctl_password_ok = 0;
1318: sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
1319: sb->sb_wptr += sb->sb_cc;
1320: do_echo=-1;
1321: return(2);
1322: #endif
1323: }
1324: }
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