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