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-rw-r--r--slirp/tcp_subr.c1011
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diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
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--- a/slirp/tcp_subr.c
+++ /dev/null
@@ -1,1011 +0,0 @@
-/*
- * Copyright (c) 1982, 1986, 1988, 1990, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93
- * tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
- */
-
-/*
- * Changes and additions relating to SLiRP
- * Copyright (c) 1995 Danny Gasparovski.
- *
- * Please read the file COPYRIGHT for the
- * terms and conditions of the copyright.
- */
-
-#define WANT_SYS_IOCTL_H
-#include <slirp.h>
-#define SLIRP_COMPILATION
-#include "sockets.h"
-#include "proxy_common.h"
-
-/* patchable/settable parameters for tcp */
-int tcp_mssdflt = TCP_MSS;
-int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
-int tcp_do_rfc1323 = 0; /* Don't do rfc1323 performance enhancements */
-int tcp_rcvspace; /* You may want to change this */
-int tcp_sndspace; /* Keep small if you have an error prone link */
-
-/*
- * Tcp initialization
- */
-void
-tcp_init()
-{
- tcp_iss = 1; /* wrong */
- tcb.so_next = tcb.so_prev = &tcb;
-
- /* tcp_rcvspace = our Window we advertise to the remote */
- tcp_rcvspace = TCP_RCVSPACE;
- tcp_sndspace = TCP_SNDSPACE;
-
- /* Make sure tcp_sndspace is at least 2*MSS */
- if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)))
- tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr));
-}
-
-/*
- * Create template to be used to send tcp packets on a connection.
- * Call after host entry created, fills
- * in a skeletal tcp/ip header, minimizing the amount of work
- * necessary when the connection is used.
- */
-/* struct tcpiphdr * */
-void
-tcp_template(tp)
- struct tcpcb *tp;
-{
- struct socket *so = tp->t_socket;
- register struct tcpiphdr *n = &tp->t_template;
-
- n->ti_next = n->ti_prev = 0;
- n->ti_x1 = 0;
- n->ti_pr = IPPROTO_TCP;
- n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip));
- n->ti_src = so->so_faddr;
- n->ti_dst = so->so_laddr;
- n->ti_sport = so->so_fport;
- n->ti_dport = so->so_lport;
-
- n->ti_seq = 0;
- n->ti_ack = 0;
- n->ti_x2 = 0;
- n->ti_off = 5;
- n->ti_flags = 0;
- n->ti_win = 0;
- n->ti_sum = 0;
- n->ti_urp = 0;
-}
-
-/*
- * Send a single message to the TCP at address specified by
- * the given TCP/IP header. If m == 0, then we make a copy
- * of the tcpiphdr at ti and send directly to the addressed host.
- * This is used to force keep alive messages out using the TCP
- * template for a connection tp->t_template. If flags are given
- * then we send a message back to the TCP which originated the
- * segment ti, and discard the mbuf containing it and any other
- * attached mbufs.
- *
- * In any case the ack and sequence number of the transmitted
- * segment are as specified by the parameters.
- */
-void
-tcp_respond(tp, ti, m, ack, seq, flags)
- struct tcpcb *tp;
- register struct tcpiphdr *ti;
- register MBuf m;
- tcp_seq ack, seq;
- int flags;
-{
- register int tlen;
- int win = 0;
-
- DEBUG_CALL("tcp_respond");
- DEBUG_ARG("tp = %lx", (long)tp);
- DEBUG_ARG("ti = %lx", (long)ti);
- DEBUG_ARG("m = %lx", (long)m);
- DEBUG_ARG("ack = %u", ack);
- DEBUG_ARG("seq = %u", seq);
- DEBUG_ARG("flags = %x", flags);
-
- if (tp)
- win = sbuf_space(&tp->t_socket->so_rcv);
- if (m == 0) {
- if ((m = mbuf_alloc()) == NULL)
- return;
-#ifdef TCP_COMPAT_42
- tlen = 1;
-#else
- tlen = 0;
-#endif
- m->m_data += if_maxlinkhdr;
- *MBUF_TO(m, struct tcpiphdr *) = *ti;
- ti = MBUF_TO(m, struct tcpiphdr *);
- flags = TH_ACK;
- } else {
- /*
- * ti points into m so the next line is just making
- * the mbuf point to ti
- */
- m->m_data = (caddr_t)ti;
-
- m->m_len = sizeof (struct tcpiphdr);
- tlen = 0;
-#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
- xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t);
- xchg(ti->ti_dport, ti->ti_sport, u_int16_t);
-#undef xchg
- }
- ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
- tlen += sizeof (struct tcpiphdr);
- m->m_len = tlen;
-
- ti->ti_next = ti->ti_prev = 0;
- ti->ti_x1 = 0;
- ti->ti_seq = htonl(seq);
- ti->ti_ack = htonl(ack);
- ti->ti_x2 = 0;
- ti->ti_off = sizeof (struct tcphdr) >> 2;
- ti->ti_flags = flags;
- if (tp)
- ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale));
- else
- ti->ti_win = htons((u_int16_t)win);
- ti->ti_urp = 0;
- ti->ti_sum = 0;
- ti->ti_sum = cksum(m, tlen);
- ((struct ip *)ti)->ip_len = tlen;
-
- if(flags & TH_RST)
- ((struct ip *)ti)->ip_ttl = MAXTTL;
- else
- ((struct ip *)ti)->ip_ttl = ip_defttl;
-
- (void) ip_output((struct socket *)0, m);
-}
-
-/*
- * Create a new TCP control block, making an
- * empty reassembly queue and hooking it to the argument
- * protocol control block.
- */
-struct tcpcb *
-tcp_newtcpcb(so)
- struct socket *so;
-{
- register struct tcpcb *tp;
-
- tp = (struct tcpcb *)malloc(sizeof(*tp));
- if (tp == NULL)
- return ((struct tcpcb *)0);
-
- memset((char *) tp, 0, sizeof(struct tcpcb));
- tp->seg_next = tp->seg_prev = (tcpiphdrp_32)tp;
- tp->t_maxseg = tcp_mssdflt;
-
- tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
- tp->t_socket = so;
-
- /*
- * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
- * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
- * reasonable initial retransmit time.
- */
- tp->t_srtt = TCPTV_SRTTBASE;
- tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
- tp->t_rttmin = TCPTV_MIN;
-
- TCPT_RANGESET(tp->t_rxtcur,
- ((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
- TCPTV_MIN, TCPTV_REXMTMAX);
-
- tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
- tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
- tp->t_state = TCPS_CLOSED;
-
- so->so_tcpcb = tp;
-
- return (tp);
-}
-
-/*
- * Drop a TCP connection, reporting
- * the specified error. If connection is synchronized,
- * then send a RST to peer.
- */
-struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
-{
-/* tcp_drop(tp, errno)
- register struct tcpcb *tp;
- int errno;
-{
-*/
-
- DEBUG_CALL("tcp_drop");
- DEBUG_ARG("tp = %lx", (long)tp);
- DEBUG_ARG("errno = %d", errno);
-
- if (TCPS_HAVERCVDSYN(tp->t_state)) {
- tp->t_state = TCPS_CLOSED;
- (void) tcp_output(tp);
- tcpstat.tcps_drops++;
- } else
- tcpstat.tcps_conndrops++;
-/* if (errno == ETIMEDOUT && tp->t_softerror)
- * errno = tp->t_softerror;
- */
-/* so->so_error = errno; */
- return (tcp_close(tp));
-}
-
-/*
- * Close a TCP control block:
- * discard all space held by the tcp
- * discard internet protocol block
- * wake up any sleepers
- */
-struct tcpcb *
-tcp_close(tp)
- register struct tcpcb *tp;
-{
- register struct tcpiphdr *t;
- struct socket *so = tp->t_socket;
- register MBuf m;
-
- DEBUG_CALL("tcp_close");
- DEBUG_ARG("tp = %lx", (long )tp);
-
- /* free the reassembly queue, if any */
- t = (struct tcpiphdr *) tp->seg_next;
- while (t != (struct tcpiphdr *)tp) {
- t = (struct tcpiphdr *)t->ti_next;
- m = (MBuf ) REASS_MBUF((struct tcpiphdr *)t->ti_prev);
- remque_32((struct tcpiphdr *) t->ti_prev);
- mbuf_free(m);
- }
- /* It's static */
-/* if (tp->t_template)
- * (void) mbuf_free(MBUF_FROM(tp->t_template));
- */
-/* free(tp, M_PCB); */
- free(tp);
- so->so_tcpcb = 0;
- soisfdisconnected(so);
- /* clobber input socket cache if we're closing the cached connection */
- if (so == tcp_last_so)
- tcp_last_so = &tcb;
- closesocket(so->s);
- sbuf_free(&so->so_rcv);
- sbuf_free(&so->so_snd);
- sofree(so);
- tcpstat.tcps_closed++;
- return ((struct tcpcb *)0);
-}
-
-void
-tcp_drain()
-{
- /* XXX */
-}
-
-/*
- * When a source quench is received, close congestion window
- * to one segment. We will gradually open it again as we proceed.
- */
-
-#ifdef notdef
-
-void
-tcp_quench(i, errno)
-
- int errno;
-{
- struct tcpcb *tp = intotcpcb(inp);
-
- if (tp)
- tp->snd_cwnd = tp->t_maxseg;
-}
-
-#endif /* notdef */
-
-/*
- * TCP protocol interface to socket abstraction.
- */
-
-/*
- * User issued close, and wish to trail through shutdown states:
- * if never received SYN, just forget it. If got a SYN from peer,
- * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
- * If already got a FIN from peer, then almost done; go to LAST_ACK
- * state. In all other cases, have already sent FIN to peer (e.g.
- * after PRU_SHUTDOWN), and just have to play tedious game waiting
- * for peer to send FIN or not respond to keep-alives, etc.
- * We can let the user exit from the close as soon as the FIN is acked.
- */
-void
-tcp_sockclosed(tp)
- struct tcpcb *tp;
-{
-
- DEBUG_CALL("tcp_sockclosed");
- DEBUG_ARG("tp = %lx", (long)tp);
-
- switch (tp->t_state) {
-
- case TCPS_CLOSED:
- case TCPS_LISTEN:
- case TCPS_SYN_SENT:
- tp->t_state = TCPS_CLOSED;
- tp = tcp_close(tp);
- break;
-
- case TCPS_SYN_RECEIVED:
- case TCPS_ESTABLISHED:
- tp->t_state = TCPS_FIN_WAIT_1;
- break;
-
- case TCPS_CLOSE_WAIT:
- tp->t_state = TCPS_LAST_ACK;
- break;
- }
-/* soisfdisconnecting(tp->t_socket); */
- if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
- soisfdisconnected(tp->t_socket);
- if (tp)
- tcp_output(tp);
-}
-
-static void
-tcp_proxy_event( struct socket* so,
- int s,
- ProxyEvent event )
-{
- so->so_state &= ~SS_PROXIFIED;
-
- if (event == PROXY_EVENT_CONNECTED) {
- so->s = s;
- so->so_state &= ~(SS_ISFCONNECTING);
- }
- else {
- so->so_state = SS_NOFDREF;
- }
-
- /* continue the connect */
- tcp_input(NULL, sizeof(struct ip), so);
-}
-
-/*
- * Connect to a host on the Internet
- * Called by tcp_input
- * Only do a connect, the tcp fields will be set in tcp_input
- * return 0 if there's a result of the connect,
- * else return -1 means we're still connecting
- * The return value is almost always -1 since the socket is
- * nonblocking. Connect returns after the SYN is sent, and does
- * not wait for ACK+SYN.
- */
-int tcp_fconnect(so)
- struct socket *so;
-{
- int ret=0;
- int try_proxy = 1;
- struct sockaddr_in addr;
-
- DEBUG_CALL("tcp_fconnect");
- DEBUG_ARG("so = %lx", (long )so);
-
- addr.sin_family = AF_INET;
- addr.sin_addr = so->so_faddr;
- addr.sin_port = so->so_fport;
-
- if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
- /* It's an alias */
- int last_byte = ntohl(so->so_faddr.s_addr) & 0xff;
-
- if (CTL_IS_DNS(last_byte))
- addr.sin_addr = dns_addr[last_byte - CTL_DNS];
- else
- addr.sin_addr = loopback_addr;
- try_proxy = 0;
- }
-
- DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
- "addr.sin_addr.s_addr=%.16s proxy=%d\n",
- ntohs(addr.sin_port), inet_ntoa(addr.sin_addr),
- try_proxy));
-
- if (try_proxy) {
- if (!proxy_manager_add(&addr, SOCK_STREAM, (ProxyEventFunc) tcp_proxy_event, so)) {
- soisfconnecting(so);
- so->s = -1;
- so->so_state |= SS_PROXIFIED;
- return 0;
- }
- }
-
- if ((ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0)
- {
- int s = so->s;
-
- socket_set_nonblock(s);
- socket_set_xreuseaddr(s);
- socket_set_oobinline(s);
-
- /* We don't care what port we get */
- ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
-
- /*
- * If it's not in progress, it failed, so we just return 0,
- * without clearing SS_NOFDREF
- */
- soisfconnecting(so);
- }
-
- return(ret);
-}
-
-/*
- * Accept the socket and connect to the local-host
- *
- * We have a problem. The correct thing to do would be
- * to first connect to the local-host, and only if the
- * connection is accepted, then do an accept() here.
- * But, a) we need to know who's trying to connect
- * to the socket to be able to SYN the local-host, and
- * b) we are already connected to the foreign host by
- * the time it gets to accept(), so... We simply accept
- * here and SYN the local-host.
- */
-void
-tcp_connect(inso)
- struct socket *inso;
-{
- struct socket *so;
- struct sockaddr_in addr;
- int addrlen = sizeof(struct sockaddr_in);
- struct tcpcb *tp;
- int s;
-
- DEBUG_CALL("tcp_connect");
- DEBUG_ARG("inso = %lx", (long)inso);
-
- /*
- * If it's an SS_ACCEPTONCE socket, no need to socreate()
- * another socket, just use the accept() socket.
- */
- if (inso->so_state & SS_FACCEPTONCE) {
- /* FACCEPTONCE already have a tcpcb */
- so = inso;
- } else {
- if ((so = socreate()) == NULL) {
- /* If it failed, get rid of the pending connection */
- closesocket(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
- return;
- }
- if (tcp_attach(so) < 0) {
- free(so); /* NOT sofree */
- return;
- }
- so->so_laddr = inso->so_laddr;
- so->so_lport = inso->so_lport;
- }
-
- (void) tcp_mss(sototcpcb(so), 0);
-
- if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) {
- tcp_close(sototcpcb(so)); /* This will sofree() as well */
- return;
- }
- socket_set_nonblock(s);
- socket_set_xreuseaddr(s);
- socket_set_oobinline(s);
- socket_set_lowlatency(s);
-
- so->so_fport = addr.sin_port;
- so->so_faddr = addr.sin_addr;
- /* Translate connections from localhost to the real hostname */
- if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr)
- so->so_faddr = alias_addr;
-
- /* Close the accept() socket, set right state */
- if (inso->so_state & SS_FACCEPTONCE) {
- socket_close(so->s); /* If we only accept once, close the accept() socket */
- so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
- /* if it's not FACCEPTONCE, it's already NOFDREF */
- }
- so->s = s;
-
- so->so_iptos = tcp_tos(so);
- tp = sototcpcb(so);
-
- tcp_template(tp);
-
- /* Compute window scaling to request. */
-/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
- * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
- * tp->request_r_scale++;
- */
-
-/* soisconnecting(so); */ /* NOFDREF used instead */
- tcpstat.tcps_connattempt++;
-
- tp->t_state = TCPS_SYN_SENT;
- tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
- tp->iss = tcp_iss;
- tcp_iss += TCP_ISSINCR/2;
- tcp_sendseqinit(tp);
- tcp_output(tp);
-}
-
-/*
- * Attach a TCPCB to a socket.
- */
-int
-tcp_attach(so)
- struct socket *so;
-{
- if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
- return -1;
-
- insque(so, &tcb);
-
- return 0;
-}
-
-/*
- * Set the socket's type of service field
- */
-struct tos_t tcptos[] = {
- {0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */
- {21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */
- {0, 23, IPTOS_LOWDELAY, 0}, /* telnet */
- {0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */
- {0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT}, /* rlogin */
- {0, 514, IPTOS_LOWDELAY, EMU_RSH|EMU_NOCONNECT}, /* shell */
- {0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */
- {0, 543, IPTOS_LOWDELAY, 0}, /* klogin */
- {0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */
- {0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */
- {0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */
- {0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */
- {0, 0, 0, 0}
-};
-
-
-/*
- * Return TOS according to the above table
- */
-u_int8_t
-tcp_tos(so)
- struct socket *so;
-{
- int i = 0;
- struct emu_t *emup;
-
- while(tcptos[i].tos) {
- if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
- (tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) {
- so->so_emu = tcptos[i].emu;
- return tcptos[i].tos;
- }
- i++;
- }
-
- return 0;
-}
-
-int do_echo = -1;
-
-/*
- * Emulate programs that try and connect to us
- * This includes ftp (the data connection is
- * initiated by the server) and IRC (DCC CHAT and
- * DCC SEND) for now
- *
- * NOTE: It's possible to crash SLiRP by sending it
- * unstandard strings to emulate... if this is a problem,
- * more checks are needed here
- *
- * XXX Assumes the whole command came in one packet
- *
- * XXX Some ftp clients will have their TOS set to
- * LOWDELAY and so Nagel will kick in. Because of this,
- * we'll get the first letter, followed by the rest, so
- * we simply scan for ORT instead of PORT...
- * DCC doesn't have this problem because there's other stuff
- * in the packet before the DCC command.
- *
- * Return 1 if the mbuf m is still valid and should be
- * sbuf_append()ed
- *
- * NOTE: if you return 0 you MUST mbuf_free() the mbuf!
- */
-int
-tcp_emu(so, m)
- struct socket *so;
- MBuf m;
-{
- u_int n1, n2, n3, n4, n5, n6;
- char buff[256];
- u_int32_t laddr;
- u_int lport;
- char *bptr;
-
- DEBUG_CALL("tcp_emu");
- DEBUG_ARG("so = %lx", (long)so);
- DEBUG_ARG("m = %lx", (long)m);
-
- switch(so->so_emu) {
- int x, i;
-
- case EMU_IDENT:
- /*
- * Identification protocol as per rfc-1413
- */
-
- {
- struct socket *tmpso;
- struct sockaddr_in addr;
- int addrlen = sizeof(struct sockaddr_in);
- SBuf so_rcv = &so->so_rcv;
-
- memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
- so_rcv->sb_wptr += m->m_len;
- so_rcv->sb_rptr += m->m_len;
- m->m_data[m->m_len] = 0; /* NULL terminate */
- if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) {
- if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) {
- HTONS(n1);
- HTONS(n2);
- /* n2 is the one on our host */
- for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
- if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
- tmpso->so_lport == n2 &&
- tmpso->so_faddr.s_addr == so->so_faddr.s_addr &&
- tmpso->so_fport == n1) {
- if (getsockname(tmpso->s,
- (struct sockaddr *)&addr, &addrlen) == 0)
- n2 = ntohs(addr.sin_port);
- break;
- }
- }
- }
- so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
- so_rcv->sb_rptr = so_rcv->sb_data;
- so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc;
- }
- mbuf_free(m);
- return 0;
- }
-
- case EMU_FTP: /* ftp */
- *(m->m_data+m->m_len) = 0; /* NULL terminate for strstr */
- if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
- /*
- * Need to emulate the PORT command
- */
- x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
- &n1, &n2, &n3, &n4, &n5, &n6, buff);
- if (x < 6)
- return 1;
-
- laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
- lport = htons((n5 << 8) | (n6));
-
- if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
- return 1;
-
- n6 = ntohs(so->so_fport);
-
- n5 = (n6 >> 8) & 0xff;
- n6 &= 0xff;
-
- laddr = ntohl(so->so_faddr.s_addr);
-
- n1 = ((laddr >> 24) & 0xff);
- n2 = ((laddr >> 16) & 0xff);
- n3 = ((laddr >> 8) & 0xff);
- n4 = (laddr & 0xff);
-
- m->m_len = bptr - m->m_data; /* Adjust length */
- m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
- n1, n2, n3, n4, n5, n6, x==7?buff:"");
- return 1;
- } else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) {
- /*
- * Need to emulate the PASV response
- */
- x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
- &n1, &n2, &n3, &n4, &n5, &n6, buff);
- if (x < 6)
- return 1;
-
- laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4));
- lport = htons((n5 << 8) | (n6));
-
- if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL)
- return 1;
-
- n6 = ntohs(so->so_fport);
-
- n5 = (n6 >> 8) & 0xff;
- n6 &= 0xff;
-
- laddr = ntohl(so->so_faddr.s_addr);
-
- n1 = ((laddr >> 24) & 0xff);
- n2 = ((laddr >> 16) & 0xff);
- n3 = ((laddr >> 8) & 0xff);
- n4 = (laddr & 0xff);
-
- m->m_len = bptr - m->m_data; /* Adjust length */
- m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
- n1, n2, n3, n4, n5, n6, x==7?buff:"");
-
- return 1;
- }
-
- return 1;
-
- case EMU_KSH:
- /*
- * The kshell (Kerberos rsh) and shell services both pass
- * a local port port number to carry signals to the server
- * and stderr to the client. It is passed at the beginning
- * of the connection as a NUL-terminated decimal ASCII string.
- */
- so->so_emu = 0;
- for (lport = 0, i = 0; i < m->m_len-1; ++i) {
- if (m->m_data[i] < '0' || m->m_data[i] > '9')
- return 1; /* invalid number */
- lport *= 10;
- lport += m->m_data[i] - '0';
- }
- if (m->m_data[m->m_len-1] == '\0' && lport != 0 &&
- (so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL)
- m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1;
- return 1;
-
- case EMU_IRC:
- /*
- * Need to emulate DCC CHAT, DCC SEND and DCC MOVE
- */
- *(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */
- if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL)
- return 1;
-
- /* The %256s is for the broken mIRC */
- if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) {
- if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
- return 1;
-
- m->m_len = bptr - m->m_data; /* Adjust length */
- m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
- (unsigned long)ntohl(so->so_faddr.s_addr),
- ntohs(so->so_fport), 1);
- } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
- if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
- return 1;
-
- m->m_len = bptr - m->m_data; /* Adjust length */
- m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
- buff, (unsigned long)ntohl(so->so_faddr.s_addr),
- ntohs(so->so_fport), n1, 1);
- } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) {
- if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL)
- return 1;
-
- m->m_len = bptr - m->m_data; /* Adjust length */
- m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
- buff, (unsigned long)ntohl(so->so_faddr.s_addr),
- ntohs(so->so_fport), n1, 1);
- }
- return 1;
-
- case EMU_REALAUDIO:
- /*
- * RealAudio emulation - JP. We must try to parse the incoming
- * data and try to find the two characters that contain the
- * port number. Then we redirect an udp port and replace the
- * number with the real port we got.
- *
- * The 1.0 beta versions of the player are not supported
- * any more.
- *
- * A typical packet for player version 1.0 (release version):
- *
- * 0000:50 4E 41 00 05
- * 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....�..g�l�c..P
- * 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
- * 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
- * 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
- *
- * Now the port number 0x1BD7 is found at offset 0x04 of the
- * Now the port number 0x1BD7 is found at offset 0x04 of the
- * second packet. This time we received five bytes first and
- * then the rest. You never know how many bytes you get.
- *
- * A typical packet for player version 2.0 (beta):
- *
- * 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........�.
- * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .gux�c..Win2.0.0
- * 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
- * 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
- * 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
- *
- * Port number 0x1BC1 is found at offset 0x0d.
- *
- * This is just a horrible switch statement. Variable ra tells
- * us where we're going.
- */
-
- bptr = m->m_data;
- while (bptr < m->m_data + m->m_len) {
- u_short p;
- static int ra = 0;
- char ra_tbl[4];
-
- ra_tbl[0] = 0x50;
- ra_tbl[1] = 0x4e;
- ra_tbl[2] = 0x41;
- ra_tbl[3] = 0;
-
- switch (ra) {
- case 0:
- case 2:
- case 3:
- if (*bptr++ != ra_tbl[ra]) {
- ra = 0;
- continue;
- }
- break;
-
- case 1:
- /*
- * We may get 0x50 several times, ignore them
- */
- if (*bptr == 0x50) {
- ra = 1;
- bptr++;
- continue;
- } else if (*bptr++ != ra_tbl[ra]) {
- ra = 0;
- continue;
- }
- break;
-
- case 4:
- /*
- * skip version number
- */
- bptr++;
- break;
-
- case 5:
- /*
- * The difference between versions 1.0 and
- * 2.0 is here. For future versions of
- * the player this may need to be modified.
- */
- if (*(bptr + 1) == 0x02)
- bptr += 8;
- else
- bptr += 4;
- break;
-
- case 6:
- /* This is the field containing the port
- * number that RA-player is listening to.
- */
- lport = (((u_char*)bptr)[0] << 8)
- + ((u_char *)bptr)[1];
- if (lport < 6970)
- lport += 256; /* don't know why */
- if (lport < 6970 || lport > 7170)
- return 1; /* failed */
-
- /* try to get udp port between 6970 - 7170 */
- for (p = 6970; p < 7071; p++) {
- if (udp_listen( htons(p),
- so->so_laddr.s_addr,
- htons(lport),
- SS_FACCEPTONCE)) {
- break;
- }
- }
- if (p == 7071)
- p = 0;
- *(u_char *)bptr++ = (p >> 8) & 0xff;
- *(u_char *)bptr++ = p & 0xff;
- ra = 0;
- return 1; /* port redirected, we're done */
- break;
-
- default:
- ra = 0;
- }
- ra++;
- }
- return 1;
-
- default:
- /* Ooops, not emulated, won't call tcp_emu again */
- so->so_emu = 0;
- return 1;
- }
-}
-
-/*
- * Do misc. config of SLiRP while its running.
- * Return 0 if this connections is to be closed, 1 otherwise,
- * return 2 if this is a command-line connection
- */
-int
-tcp_ctl(so)
- struct socket *so;
-{
- SBuf sb = &so->so_snd;
- int command;
- struct ex_list *ex_ptr;
- int do_pty;
- // struct socket *tmpso;
-
- DEBUG_CALL("tcp_ctl");
- DEBUG_ARG("so = %lx", (long )so);
-
-#if 0
- /*
- * Check if they're authorised
- */
- if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 || (so->so_laddr.s_addr != ctl_addr.s_addr))) {
- sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
- sb->sb_wptr += sb->sb_cc;
- return 0;
- }
-#endif
- command = (ntohl(so->so_faddr.s_addr) & 0xff);
-
- switch(command) {
- default:
- /*
- * Nothing bound..
- */
- /* tcp_fconnect(so); */
-
- case CTL_ALIAS:
- sb->sb_cc = sprintf(sb->sb_wptr,
- "Error: No application configured.\r\n");
- sb->sb_wptr += sb->sb_cc;
- return(0);
- }
-}
generated by cgit v1.1 at 2025-08-17 17:47:09 +0000