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