slirp: API is extern C
[qemu/ar7.git] / slirp / tcp_subr.c
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1 /*
2 * Copyright (c) 1982, 1986, 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
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.
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.
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
34 * Changes and additions relating to SLiRP
35 * Copyright (c) 1995 Danny Gasparovski.
37 * Please read the file COPYRIGHT for the
38 * terms and conditions of the copyright.
41 #include "slirp.h"
43 /* patchable/settable parameters for tcp */
44 /* Don't do rfc1323 performance enhancements */
45 #define TCP_DO_RFC1323 0
48 * Tcp initialization
50 void
51 tcp_init(Slirp *slirp)
53 slirp->tcp_iss = 1; /* wrong */
54 slirp->tcb.so_next = slirp->tcb.so_prev = &slirp->tcb;
55 slirp->tcp_last_so = &slirp->tcb;
58 void tcp_cleanup(Slirp *slirp)
60 while (slirp->tcb.so_next != &slirp->tcb) {
61 tcp_close(sototcpcb(slirp->tcb.so_next));
66 * Create template to be used to send tcp packets on a connection.
67 * Call after host entry created, fills
68 * in a skeletal tcp/ip header, minimizing the amount of work
69 * necessary when the connection is used.
71 void
72 tcp_template(struct tcpcb *tp)
74 struct socket *so = tp->t_socket;
75 register struct tcpiphdr *n = &tp->t_template;
77 n->ti_mbuf = NULL;
78 memset(&n->ti, 0, sizeof(n->ti));
79 n->ti_x0 = 0;
80 switch (so->so_ffamily) {
81 case AF_INET:
82 n->ti_pr = IPPROTO_TCP;
83 n->ti_len = htons(sizeof(struct tcphdr));
84 n->ti_src = so->so_faddr;
85 n->ti_dst = so->so_laddr;
86 n->ti_sport = so->so_fport;
87 n->ti_dport = so->so_lport;
88 break;
90 case AF_INET6:
91 n->ti_nh6 = IPPROTO_TCP;
92 n->ti_len = htons(sizeof(struct tcphdr));
93 n->ti_src6 = so->so_faddr6;
94 n->ti_dst6 = so->so_laddr6;
95 n->ti_sport = so->so_fport6;
96 n->ti_dport = so->so_lport6;
97 break;
99 default:
100 g_assert_not_reached();
103 n->ti_seq = 0;
104 n->ti_ack = 0;
105 n->ti_x2 = 0;
106 n->ti_off = 5;
107 n->ti_flags = 0;
108 n->ti_win = 0;
109 n->ti_sum = 0;
110 n->ti_urp = 0;
114 * Send a single message to the TCP at address specified by
115 * the given TCP/IP header. If m == 0, then we make a copy
116 * of the tcpiphdr at ti and send directly to the addressed host.
117 * This is used to force keep alive messages out using the TCP
118 * template for a connection tp->t_template. If flags are given
119 * then we send a message back to the TCP which originated the
120 * segment ti, and discard the mbuf containing it and any other
121 * attached mbufs.
123 * In any case the ack and sequence number of the transmitted
124 * segment are as specified by the parameters.
126 void
127 tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
128 tcp_seq ack, tcp_seq seq, int flags, unsigned short af)
130 register int tlen;
131 int win = 0;
133 DEBUG_CALL("tcp_respond");
134 DEBUG_ARG("tp = %p", tp);
135 DEBUG_ARG("ti = %p", ti);
136 DEBUG_ARG("m = %p", m);
137 DEBUG_ARG("ack = %u", ack);
138 DEBUG_ARG("seq = %u", seq);
139 DEBUG_ARG("flags = %x", flags);
141 if (tp)
142 win = sbspace(&tp->t_socket->so_rcv);
143 if (m == NULL) {
144 if (!tp || (m = m_get(tp->t_socket->slirp)) == NULL)
145 return;
146 tlen = 0;
147 m->m_data += IF_MAXLINKHDR;
148 *mtod(m, struct tcpiphdr *) = *ti;
149 ti = mtod(m, struct tcpiphdr *);
150 switch (af) {
151 case AF_INET:
152 ti->ti.ti_i4.ih_x1 = 0;
153 break;
154 case AF_INET6:
155 ti->ti.ti_i6.ih_x1 = 0;
156 break;
157 default:
158 g_assert_not_reached();
160 flags = TH_ACK;
161 } else {
163 * ti points into m so the next line is just making
164 * the mbuf point to ti
166 m->m_data = (char *)ti;
168 m->m_len = sizeof (struct tcpiphdr);
169 tlen = 0;
170 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
171 switch (af) {
172 case AF_INET:
173 xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, uint32_t);
174 xchg(ti->ti_dport, ti->ti_sport, uint16_t);
175 break;
176 case AF_INET6:
177 xchg(ti->ti_dst6, ti->ti_src6, struct in6_addr);
178 xchg(ti->ti_dport, ti->ti_sport, uint16_t);
179 break;
180 default:
181 g_assert_not_reached();
183 #undef xchg
185 ti->ti_len = htons((uint16_t)(sizeof (struct tcphdr) + tlen));
186 tlen += sizeof (struct tcpiphdr);
187 m->m_len = tlen;
189 ti->ti_mbuf = NULL;
190 ti->ti_x0 = 0;
191 ti->ti_seq = htonl(seq);
192 ti->ti_ack = htonl(ack);
193 ti->ti_x2 = 0;
194 ti->ti_off = sizeof (struct tcphdr) >> 2;
195 ti->ti_flags = flags;
196 if (tp)
197 ti->ti_win = htons((uint16_t) (win >> tp->rcv_scale));
198 else
199 ti->ti_win = htons((uint16_t)win);
200 ti->ti_urp = 0;
201 ti->ti_sum = 0;
202 ti->ti_sum = cksum(m, tlen);
204 struct tcpiphdr tcpiph_save = *(mtod(m, struct tcpiphdr *));
205 struct ip *ip;
206 struct ip6 *ip6;
208 switch (af) {
209 case AF_INET:
210 m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
211 - sizeof(struct ip);
212 m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
213 - sizeof(struct ip);
214 ip = mtod(m, struct ip *);
215 ip->ip_len = m->m_len;
216 ip->ip_dst = tcpiph_save.ti_dst;
217 ip->ip_src = tcpiph_save.ti_src;
218 ip->ip_p = tcpiph_save.ti_pr;
220 if (flags & TH_RST) {
221 ip->ip_ttl = MAXTTL;
222 } else {
223 ip->ip_ttl = IPDEFTTL;
226 ip_output(NULL, m);
227 break;
229 case AF_INET6:
230 m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
231 - sizeof(struct ip6);
232 m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
233 - sizeof(struct ip6);
234 ip6 = mtod(m, struct ip6 *);
235 ip6->ip_pl = tcpiph_save.ti_len;
236 ip6->ip_dst = tcpiph_save.ti_dst6;
237 ip6->ip_src = tcpiph_save.ti_src6;
238 ip6->ip_nh = tcpiph_save.ti_nh6;
240 ip6_output(NULL, m, 0);
241 break;
243 default:
244 g_assert_not_reached();
249 * Create a new TCP control block, making an
250 * empty reassembly queue and hooking it to the argument
251 * protocol control block.
253 struct tcpcb *
254 tcp_newtcpcb(struct socket *so)
256 register struct tcpcb *tp;
258 tp = (struct tcpcb *)malloc(sizeof(*tp));
259 if (tp == NULL)
260 return ((struct tcpcb *)0);
262 memset((char *) tp, 0, sizeof(struct tcpcb));
263 tp->seg_next = tp->seg_prev = (struct tcpiphdr*)tp;
264 tp->t_maxseg = (so->so_ffamily == AF_INET) ? TCP_MSS : TCP6_MSS;
266 tp->t_flags = TCP_DO_RFC1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
267 tp->t_socket = so;
270 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
271 * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
272 * reasonable initial retransmit time.
274 tp->t_srtt = TCPTV_SRTTBASE;
275 tp->t_rttvar = TCPTV_SRTTDFLT << 2;
276 tp->t_rttmin = TCPTV_MIN;
278 TCPT_RANGESET(tp->t_rxtcur,
279 ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
280 TCPTV_MIN, TCPTV_REXMTMAX);
282 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
283 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
284 tp->t_state = TCPS_CLOSED;
286 so->so_tcpcb = tp;
288 return (tp);
292 * Drop a TCP connection, reporting
293 * the specified error. If connection is synchronized,
294 * then send a RST to peer.
296 struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
298 DEBUG_CALL("tcp_drop");
299 DEBUG_ARG("tp = %p", tp);
300 DEBUG_ARG("errno = %d", errno);
302 if (TCPS_HAVERCVDSYN(tp->t_state)) {
303 tp->t_state = TCPS_CLOSED;
304 (void) tcp_output(tp);
306 return (tcp_close(tp));
310 * Close a TCP control block:
311 * discard all space held by the tcp
312 * discard internet protocol block
313 * wake up any sleepers
315 struct tcpcb *
316 tcp_close(struct tcpcb *tp)
318 register struct tcpiphdr *t;
319 struct socket *so = tp->t_socket;
320 Slirp *slirp = so->slirp;
321 register struct mbuf *m;
323 DEBUG_CALL("tcp_close");
324 DEBUG_ARG("tp = %p", tp);
326 /* free the reassembly queue, if any */
327 t = tcpfrag_list_first(tp);
328 while (!tcpfrag_list_end(t, tp)) {
329 t = tcpiphdr_next(t);
330 m = tcpiphdr_prev(t)->ti_mbuf;
331 remque(tcpiphdr2qlink(tcpiphdr_prev(t)));
332 m_free(m);
334 free(tp);
335 so->so_tcpcb = NULL;
336 /* clobber input socket cache if we're closing the cached connection */
337 if (so == slirp->tcp_last_so)
338 slirp->tcp_last_so = &slirp->tcb;
339 so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
340 slirp_closesocket(so->s);
341 sbfree(&so->so_rcv);
342 sbfree(&so->so_snd);
343 sofree(so);
344 return ((struct tcpcb *)0);
348 * TCP protocol interface to socket abstraction.
352 * User issued close, and wish to trail through shutdown states:
353 * if never received SYN, just forget it. If got a SYN from peer,
354 * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
355 * If already got a FIN from peer, then almost done; go to LAST_ACK
356 * state. In all other cases, have already sent FIN to peer (e.g.
357 * after PRU_SHUTDOWN), and just have to play tedious game waiting
358 * for peer to send FIN or not respond to keep-alives, etc.
359 * We can let the user exit from the close as soon as the FIN is acked.
361 void
362 tcp_sockclosed(struct tcpcb *tp)
365 DEBUG_CALL("tcp_sockclosed");
366 DEBUG_ARG("tp = %p", tp);
368 if (!tp) {
369 return;
372 switch (tp->t_state) {
374 case TCPS_CLOSED:
375 case TCPS_LISTEN:
376 case TCPS_SYN_SENT:
377 tp->t_state = TCPS_CLOSED;
378 tp = tcp_close(tp);
379 break;
381 case TCPS_SYN_RECEIVED:
382 case TCPS_ESTABLISHED:
383 tp->t_state = TCPS_FIN_WAIT_1;
384 break;
386 case TCPS_CLOSE_WAIT:
387 tp->t_state = TCPS_LAST_ACK;
388 break;
390 tcp_output(tp);
394 * Connect to a host on the Internet
395 * Called by tcp_input
396 * Only do a connect, the tcp fields will be set in tcp_input
397 * return 0 if there's a result of the connect,
398 * else return -1 means we're still connecting
399 * The return value is almost always -1 since the socket is
400 * nonblocking. Connect returns after the SYN is sent, and does
401 * not wait for ACK+SYN.
403 int tcp_fconnect(struct socket *so, unsigned short af)
405 int ret=0;
407 DEBUG_CALL("tcp_fconnect");
408 DEBUG_ARG("so = %p", so);
410 ret = so->s = slirp_socket(af, SOCK_STREAM, 0);
411 if (ret >= 0) {
412 int opt, s=so->s;
413 struct sockaddr_storage addr;
415 slirp_set_nonblock(s);
416 so->slirp->cb->register_poll_fd(so->s, so->slirp->opaque);
417 slirp_socket_set_fast_reuse(s);
418 opt = 1;
419 slirp_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
420 opt = 1;
421 slirp_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
423 addr = so->fhost.ss;
424 DEBUG_CALL(" connect()ing");
425 sotranslate_out(so, &addr);
427 /* We don't care what port we get */
428 ret = connect(s, (struct sockaddr *)&addr, sockaddr_size(&addr));
431 * If it's not in progress, it failed, so we just return 0,
432 * without clearing SS_NOFDREF
434 soisfconnecting(so);
437 return(ret);
441 * Accept the socket and connect to the local-host
443 * We have a problem. The correct thing to do would be
444 * to first connect to the local-host, and only if the
445 * connection is accepted, then do an accept() here.
446 * But, a) we need to know who's trying to connect
447 * to the socket to be able to SYN the local-host, and
448 * b) we are already connected to the foreign host by
449 * the time it gets to accept(), so... We simply accept
450 * here and SYN the local-host.
452 void tcp_connect(struct socket *inso)
454 Slirp *slirp = inso->slirp;
455 struct socket *so;
456 struct sockaddr_storage addr;
457 socklen_t addrlen = sizeof(struct sockaddr_storage);
458 struct tcpcb *tp;
459 int s, opt;
461 DEBUG_CALL("tcp_connect");
462 DEBUG_ARG("inso = %p", inso);
465 * If it's an SS_ACCEPTONCE socket, no need to socreate()
466 * another socket, just use the accept() socket.
468 if (inso->so_state & SS_FACCEPTONCE) {
469 /* FACCEPTONCE already have a tcpcb */
470 so = inso;
471 } else {
472 so = socreate(slirp);
473 if (tcp_attach(so) < 0) {
474 g_free(so); /* NOT sofree */
475 return;
477 so->lhost = inso->lhost;
478 so->so_ffamily = inso->so_ffamily;
481 tcp_mss(sototcpcb(so), 0);
483 s = accept(inso->s, (struct sockaddr *)&addr, &addrlen);
484 if (s < 0) {
485 tcp_close(sototcpcb(so)); /* This will sofree() as well */
486 return;
488 slirp_set_nonblock(s);
489 so->slirp->cb->register_poll_fd(so->s, so->slirp->opaque);
490 slirp_socket_set_fast_reuse(s);
491 opt = 1;
492 slirp_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
493 slirp_socket_set_nodelay(s);
495 so->fhost.ss = addr;
496 sotranslate_accept(so);
498 /* Close the accept() socket, set right state */
499 if (inso->so_state & SS_FACCEPTONCE) {
500 /* If we only accept once, close the accept() socket */
501 so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
502 slirp_closesocket(so->s);
504 /* Don't select it yet, even though we have an FD */
505 /* if it's not FACCEPTONCE, it's already NOFDREF */
506 so->so_state = SS_NOFDREF;
508 so->s = s;
509 so->so_state |= SS_INCOMING;
511 so->so_iptos = tcp_tos(so);
512 tp = sototcpcb(so);
514 tcp_template(tp);
516 tp->t_state = TCPS_SYN_SENT;
517 tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
518 tp->iss = slirp->tcp_iss;
519 slirp->tcp_iss += TCP_ISSINCR/2;
520 tcp_sendseqinit(tp);
521 tcp_output(tp);
525 * Attach a TCPCB to a socket.
528 tcp_attach(struct socket *so)
530 if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
531 return -1;
533 insque(so, &so->slirp->tcb);
535 return 0;
539 * Set the socket's type of service field
541 static const struct tos_t tcptos[] = {
542 {0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
543 {21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
544 {0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
545 {0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
546 {0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT}, /* rlogin */
547 {0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
548 {0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
549 {0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
550 {0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
551 {0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
552 {0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
553 {0, 0, 0, 0}
556 static struct emu_t *tcpemu = NULL;
559 * Return TOS according to the above table
561 uint8_t
562 tcp_tos(struct socket *so)
564 int i = 0;
565 struct emu_t *emup;
567 while(tcptos[i].tos) {
568 if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
569 (tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
570 so->so_emu = tcptos[i].emu;
571 return tcptos[i].tos;
573 i++;
576 /* Nope, lets see if there's a user-added one */
577 for (emup = tcpemu; emup; emup = emup->next) {
578 if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
579 (emup->lport && (ntohs(so->so_lport) == emup->lport))) {
580 so->so_emu = emup->emu;
581 return emup->tos;
585 return 0;
589 * Emulate programs that try and connect to us
590 * This includes ftp (the data connection is
591 * initiated by the server) and IRC (DCC CHAT and
592 * DCC SEND) for now
594 * NOTE: It's possible to crash SLiRP by sending it
595 * unstandard strings to emulate... if this is a problem,
596 * more checks are needed here
598 * XXX Assumes the whole command came in one packet
600 * XXX Some ftp clients will have their TOS set to
601 * LOWDELAY and so Nagel will kick in. Because of this,
602 * we'll get the first letter, followed by the rest, so
603 * we simply scan for ORT instead of PORT...
604 * DCC doesn't have this problem because there's other stuff
605 * in the packet before the DCC command.
607 * Return 1 if the mbuf m is still valid and should be
608 * sbappend()ed
610 * NOTE: if you return 0 you MUST m_free() the mbuf!
613 tcp_emu(struct socket *so, struct mbuf *m)
615 Slirp *slirp = so->slirp;
616 unsigned n1, n2, n3, n4, n5, n6;
617 char buff[257];
618 uint32_t laddr;
619 unsigned lport;
620 char *bptr;
622 DEBUG_CALL("tcp_emu");
623 DEBUG_ARG("so = %p", so);
624 DEBUG_ARG("m = %p", m);
626 switch(so->so_emu) {
627 int x, i;
629 case EMU_IDENT:
631 * Identification protocol as per rfc-1413
635 struct socket *tmpso;
636 struct sockaddr_in addr;
637 socklen_t addrlen = sizeof(struct sockaddr_in);
638 struct sbuf *so_rcv = &so->so_rcv;
640 if (m->m_len > so_rcv->sb_datalen
641 - (so_rcv->sb_wptr - so_rcv->sb_data)) {
642 return 1;
645 memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
646 so_rcv->sb_wptr += m->m_len;
647 so_rcv->sb_rptr += m->m_len;
648 m->m_data[m->m_len] = 0; /* NULL terminate */
649 if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
650 if (sscanf(so_rcv->sb_data, "%u%*[ ,]%u", &n1, &n2) == 2) {
651 HTONS(n1);
652 HTONS(n2);
653 /* n2 is the one on our host */
654 for (tmpso = slirp->tcb.so_next;
655 tmpso != &slirp->tcb;
656 tmpso = tmpso->so_next) {
657 if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
658 tmpso->so_lport == n2 &&
659 tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
660 tmpso->so_fport == n1) {
661 if (getsockname(tmpso->s,
662 (struct sockaddr *)&addr, &addrlen) == 0)
663 n2 = ntohs(addr.sin_port);
664 break;
668 so_rcv->sb_cc = snprintf(so_rcv->sb_data,
669 so_rcv->sb_datalen,
670 "%d,%d\r\n", n1, n2);
671 so_rcv->sb_rptr = so_rcv->sb_data;
672 so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
674 m_free(m);
675 return 0;
678 case EMU_FTP: /* ftp */
679 *(m->m_data+m->m_len) = 0; /* NUL terminate for strstr */
680 if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
682 * Need to emulate the PORT command
684 x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\r\n%256[^\177]",
685 &n1, &n2, &n3, &n4, &n5, &n6, buff);
686 if (x < 6)
687 return 1;
689 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
690 lport = htons((n5 << 8) | (n6));
692 if ((so = tcp_listen(slirp, INADDR_ANY, 0, laddr,
693 lport, SS_FACCEPTONCE)) == NULL) {
694 return 1;
696 n6 = ntohs(so->so_fport);
698 n5 = (n6 >> 8) & 0xff;
699 n6 &= 0xff;
701 laddr = ntohl(so->so_faddr.s_addr);
703 n1 = ((laddr >> 24) & 0xff);
704 n2 = ((laddr >> 16) & 0xff);
705 n3 = ((laddr >> 8) & 0xff);
706 n4 = (laddr & 0xff);
708 m->m_len = bptr - m->m_data; /* Adjust length */
709 m->m_len += snprintf(bptr, m->m_size - m->m_len,
710 "ORT %d,%d,%d,%d,%d,%d\r\n%s",
711 n1, n2, n3, n4, n5, n6, x==7?buff:"");
712 return 1;
713 } else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
715 * Need to emulate the PASV response
717 x = sscanf(bptr, "27 Entering Passive Mode (%u,%u,%u,%u,%u,%u)\r\n%256[^\177]",
718 &n1, &n2, &n3, &n4, &n5, &n6, buff);
719 if (x < 6)
720 return 1;
722 laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
723 lport = htons((n5 << 8) | (n6));
725 if ((so = tcp_listen(slirp, INADDR_ANY, 0, laddr,
726 lport, SS_FACCEPTONCE)) == NULL) {
727 return 1;
729 n6 = ntohs(so->so_fport);
731 n5 = (n6 >> 8) & 0xff;
732 n6 &= 0xff;
734 laddr = ntohl(so->so_faddr.s_addr);
736 n1 = ((laddr >> 24) & 0xff);
737 n2 = ((laddr >> 16) & 0xff);
738 n3 = ((laddr >> 8) & 0xff);
739 n4 = (laddr & 0xff);
741 m->m_len = bptr - m->m_data; /* Adjust length */
742 m->m_len += snprintf(bptr, m->m_size - m->m_len,
743 "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
744 n1, n2, n3, n4, n5, n6, x==7?buff:"");
746 return 1;
749 return 1;
751 case EMU_KSH:
753 * The kshell (Kerberos rsh) and shell services both pass
754 * a local port port number to carry signals to the server
755 * and stderr to the client. It is passed at the beginning
756 * of the connection as a NUL-terminated decimal ASCII string.
758 so->so_emu = 0;
759 for (lport = 0, i = 0; i < m->m_len-1; ++i) {
760 if (m->m_data[i] < '0' || m->m_data[i] > '9')
761 return 1; /* invalid number */
762 lport *= 10;
763 lport += m->m_data[i] - '0';
765 if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
766 (so = tcp_listen(slirp, INADDR_ANY, 0, so->so_laddr.s_addr,
767 htons(lport), SS_FACCEPTONCE)) != NULL)
768 m->m_len = snprintf(m->m_data, m->m_size, "%d",
769 ntohs(so->so_fport)) + 1;
770 return 1;
772 case EMU_IRC:
774 * Need to emulate DCC CHAT, DCC SEND and DCC MOVE
776 *(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */
777 if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
778 return 1;
780 /* The %256s is for the broken mIRC */
781 if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
782 if ((so = tcp_listen(slirp, INADDR_ANY, 0,
783 htonl(laddr), htons(lport),
784 SS_FACCEPTONCE)) == NULL) {
785 return 1;
787 m->m_len = bptr - m->m_data; /* Adjust length */
788 m->m_len += snprintf(bptr, m->m_size,
789 "DCC CHAT chat %lu %u%c\n",
790 (unsigned long)ntohl(so->so_faddr.s_addr),
791 ntohs(so->so_fport), 1);
792 } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
793 if ((so = tcp_listen(slirp, INADDR_ANY, 0,
794 htonl(laddr), htons(lport),
795 SS_FACCEPTONCE)) == NULL) {
796 return 1;
798 m->m_len = bptr - m->m_data; /* Adjust length */
799 m->m_len += snprintf(bptr, m->m_size,
800 "DCC SEND %s %lu %u %u%c\n", buff,
801 (unsigned long)ntohl(so->so_faddr.s_addr),
802 ntohs(so->so_fport), n1, 1);
803 } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
804 if ((so = tcp_listen(slirp, INADDR_ANY, 0,
805 htonl(laddr), htons(lport),
806 SS_FACCEPTONCE)) == NULL) {
807 return 1;
809 m->m_len = bptr - m->m_data; /* Adjust length */
810 m->m_len += snprintf(bptr, m->m_size,
811 "DCC MOVE %s %lu %u %u%c\n", buff,
812 (unsigned long)ntohl(so->so_faddr.s_addr),
813 ntohs(so->so_fport), n1, 1);
815 return 1;
817 case EMU_REALAUDIO:
819 * RealAudio emulation - JP. We must try to parse the incoming
820 * data and try to find the two characters that contain the
821 * port number. Then we redirect an udp port and replace the
822 * number with the real port we got.
824 * The 1.0 beta versions of the player are not supported
825 * any more.
827 * A typical packet for player version 1.0 (release version):
829 * 0000:50 4E 41 00 05
830 * 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 ........g.l.c..P
831 * 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
832 * 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
833 * 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
835 * Now the port number 0x1BD7 is found at offset 0x04 of the
836 * Now the port number 0x1BD7 is found at offset 0x04 of the
837 * second packet. This time we received five bytes first and
838 * then the rest. You never know how many bytes you get.
840 * A typical packet for player version 2.0 (beta):
842 * 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA.............
843 * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .gux.c..Win2.0.0
844 * 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
845 * 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
846 * 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
848 * Port number 0x1BC1 is found at offset 0x0d.
850 * This is just a horrible switch statement. Variable ra tells
851 * us where we're going.
854 bptr = m->m_data;
855 while (bptr < m->m_data + m->m_len) {
856 uint16_t p;
857 static int ra = 0;
858 char ra_tbl[4];
860 ra_tbl[0] = 0x50;
861 ra_tbl[1] = 0x4e;
862 ra_tbl[2] = 0x41;
863 ra_tbl[3] = 0;
865 switch (ra) {
866 case 0:
867 case 2:
868 case 3:
869 if (*bptr++ != ra_tbl[ra]) {
870 ra = 0;
871 continue;
873 break;
875 case 1:
877 * We may get 0x50 several times, ignore them
879 if (*bptr == 0x50) {
880 ra = 1;
881 bptr++;
882 continue;
883 } else if (*bptr++ != ra_tbl[ra]) {
884 ra = 0;
885 continue;
887 break;
889 case 4:
891 * skip version number
893 bptr++;
894 break;
896 case 5:
898 * The difference between versions 1.0 and
899 * 2.0 is here. For future versions of
900 * the player this may need to be modified.
902 if (*(bptr + 1) == 0x02)
903 bptr += 8;
904 else
905 bptr += 4;
906 break;
908 case 6:
909 /* This is the field containing the port
910 * number that RA-player is listening to.
912 lport = (((uint8_t*)bptr)[0] << 8)
913 + ((uint8_t *)bptr)[1];
914 if (lport < 6970)
915 lport += 256; /* don't know why */
916 if (lport < 6970 || lport > 7170)
917 return 1; /* failed */
919 /* try to get udp port between 6970 - 7170 */
920 for (p = 6970; p < 7071; p++) {
921 if (udp_listen(slirp, INADDR_ANY,
922 htons(p),
923 so->so_laddr.s_addr,
924 htons(lport),
925 SS_FACCEPTONCE)) {
926 break;
929 if (p == 7071)
930 p = 0;
931 *(uint8_t *)bptr++ = (p >> 8) & 0xff;
932 *(uint8_t *)bptr = p & 0xff;
933 ra = 0;
934 return 1; /* port redirected, we're done */
935 break;
937 default:
938 ra = 0;
940 ra++;
942 return 1;
944 default:
945 /* Ooops, not emulated, won't call tcp_emu again */
946 so->so_emu = 0;
947 return 1;
952 * Do misc. config of SLiRP while its running.
953 * Return 0 if this connections is to be closed, 1 otherwise,
954 * return 2 if this is a command-line connection
956 int tcp_ctl(struct socket *so)
958 Slirp *slirp = so->slirp;
959 struct sbuf *sb = &so->so_snd;
960 struct gfwd_list *ex_ptr;
962 DEBUG_CALL("tcp_ctl");
963 DEBUG_ARG("so = %p", so);
965 if (so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
966 /* Check if it's pty_exec */
967 for (ex_ptr = slirp->guestfwd_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
968 if (ex_ptr->ex_fport == so->so_fport &&
969 so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr) {
970 if (ex_ptr->write_cb) {
971 so->s = -1;
972 so->guestfwd = ex_ptr;
973 return 1;
975 DEBUG_MISC(" executing %s", ex_ptr->ex_exec);
976 return fork_exec(so, ex_ptr->ex_exec);
980 sb->sb_cc =
981 snprintf(sb->sb_wptr, sb->sb_datalen - (sb->sb_wptr - sb->sb_data),
982 "Error: No application configured.\r\n");
983 sb->sb_wptr += sb->sb_cc;
984 return 0;