root / slirp / tcp_subr.c @ d64477af
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/*
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* Copyright (c) 1982, 1986, 1988, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93
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* tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
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*/
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/*
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* Changes and additions relating to SLiRP
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* Copyright (c) 1995 Danny Gasparovski.
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*
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* Please read the file COPYRIGHT for the
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* terms and conditions of the copyright.
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*/
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#define WANT_SYS_IOCTL_H
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#include <slirp.h> |
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/* patchable/settable parameters for tcp */
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int tcp_mssdflt = TCP_MSS;
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int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ;
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int tcp_do_rfc1323 = 0; /* Don't do rfc1323 performance enhancements */ |
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int tcp_rcvspace; /* You may want to change this */ |
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int tcp_sndspace; /* Keep small if you have an error prone link */ |
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/*
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* Tcp initialization
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*/
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void
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tcp_init() |
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{ |
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tcp_iss = 1; /* wrong */ |
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tcb.so_next = tcb.so_prev = &tcb; |
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/* tcp_rcvspace = our Window we advertise to the remote */
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tcp_rcvspace = TCP_RCVSPACE; |
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tcp_sndspace = TCP_SNDSPACE; |
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/* Make sure tcp_sndspace is at least 2*MSS */
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if (tcp_sndspace < 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr))) |
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tcp_sndspace = 2*(min(if_mtu, if_mru) - sizeof(struct tcpiphdr)); |
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} |
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/*
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* Create template to be used to send tcp packets on a connection.
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* Call after host entry created, fills
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* in a skeletal tcp/ip header, minimizing the amount of work
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* necessary when the connection is used.
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*/
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/* struct tcpiphdr * */
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void
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tcp_template(tp) |
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struct tcpcb *tp;
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{ |
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struct socket *so = tp->t_socket;
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register struct tcpiphdr *n = &tp->t_template; |
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n->ti_next = n->ti_prev = 0;
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n->ti_x1 = 0;
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n->ti_pr = IPPROTO_TCP; |
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n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip)); |
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n->ti_src = so->so_faddr; |
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n->ti_dst = so->so_laddr; |
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n->ti_sport = so->so_fport; |
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n->ti_dport = so->so_lport; |
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n->ti_seq = 0;
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n->ti_ack = 0;
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n->ti_x2 = 0;
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n->ti_off = 5;
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n->ti_flags = 0;
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n->ti_win = 0;
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n->ti_sum = 0;
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n->ti_urp = 0;
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} |
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/*
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* Send a single message to the TCP at address specified by
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* the given TCP/IP header. If m == 0, then we make a copy
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* of the tcpiphdr at ti and send directly to the addressed host.
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* This is used to force keep alive messages out using the TCP
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* template for a connection tp->t_template. If flags are given
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* then we send a message back to the TCP which originated the
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* segment ti, and discard the mbuf containing it and any other
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* attached mbufs.
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*
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* In any case the ack and sequence number of the transmitted
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* segment are as specified by the parameters.
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*/
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void
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tcp_respond(tp, ti, m, ack, seq, flags) |
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struct tcpcb *tp;
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register struct tcpiphdr *ti; |
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register struct mbuf *m; |
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tcp_seq ack, seq; |
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int flags;
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{ |
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register int tlen; |
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int win = 0; |
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DEBUG_CALL("tcp_respond");
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DEBUG_ARG("tp = %lx", (long)tp); |
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DEBUG_ARG("ti = %lx", (long)ti); |
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DEBUG_ARG("m = %lx", (long)m); |
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DEBUG_ARG("ack = %u", ack);
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DEBUG_ARG("seq = %u", seq);
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DEBUG_ARG("flags = %x", flags);
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if (tp)
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win = sbspace(&tp->t_socket->so_rcv); |
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if (m == 0) { |
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if ((m = m_get()) == NULL) |
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return;
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#ifdef TCP_COMPAT_42
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tlen = 1;
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#else
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tlen = 0;
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#endif
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m->m_data += if_maxlinkhdr; |
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*mtod(m, struct tcpiphdr *) = *ti;
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ti = mtod(m, struct tcpiphdr *);
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flags = TH_ACK; |
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} else {
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/*
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* ti points into m so the next line is just making
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* the mbuf point to ti
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*/
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m->m_data = (caddr_t)ti; |
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m->m_len = sizeof (struct tcpiphdr); |
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tlen = 0;
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#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
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xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, u_int32_t); |
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xchg(ti->ti_dport, ti->ti_sport, u_int16_t); |
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#undef xchg
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} |
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ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen)); |
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tlen += sizeof (struct tcpiphdr); |
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m->m_len = tlen; |
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ti->ti_next = ti->ti_prev = 0;
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ti->ti_x1 = 0;
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ti->ti_seq = htonl(seq); |
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ti->ti_ack = htonl(ack); |
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ti->ti_x2 = 0;
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ti->ti_off = sizeof (struct tcphdr) >> 2; |
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ti->ti_flags = flags; |
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if (tp)
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ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale)); |
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else
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ti->ti_win = htons((u_int16_t)win); |
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ti->ti_urp = 0;
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ti->ti_sum = 0;
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ti->ti_sum = cksum(m, tlen); |
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((struct ip *)ti)->ip_len = tlen;
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if(flags & TH_RST)
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((struct ip *)ti)->ip_ttl = MAXTTL;
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else
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((struct ip *)ti)->ip_ttl = ip_defttl;
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(void) ip_output((struct socket *)0, m); |
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} |
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/*
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* Create a new TCP control block, making an
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* empty reassembly queue and hooking it to the argument
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* protocol control block.
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*/
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struct tcpcb *
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tcp_newtcpcb(so) |
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struct socket *so;
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{ |
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register struct tcpcb *tp; |
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tp = (struct tcpcb *)malloc(sizeof(*tp)); |
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if (tp == NULL) |
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return ((struct tcpcb *)0); |
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memset((char *) tp, 0, sizeof(struct tcpcb)); |
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tp->seg_next = tp->seg_prev = (tcpiphdrp_32)tp; |
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tp->t_maxseg = tcp_mssdflt; |
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tp->t_flags = tcp_do_rfc1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
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tp->t_socket = so; |
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/*
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* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
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* rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
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* reasonable initial retransmit time.
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*/
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tp->t_srtt = TCPTV_SRTTBASE; |
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tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << 2;
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tp->t_rttmin = TCPTV_MIN; |
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TCPT_RANGESET(tp->t_rxtcur, |
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((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1, |
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TCPTV_MIN, TCPTV_REXMTMAX); |
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tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; |
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tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT; |
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tp->t_state = TCPS_CLOSED; |
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so->so_tcpcb = tp; |
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return (tp);
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} |
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/*
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* Drop a TCP connection, reporting
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* the specified error. If connection is synchronized,
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* then send a RST to peer.
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*/
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struct tcpcb *tcp_drop(struct tcpcb *tp, int errno) |
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{ |
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/* tcp_drop(tp, errno)
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register struct tcpcb *tp;
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int errno;
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{
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*/
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DEBUG_CALL("tcp_drop");
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DEBUG_ARG("tp = %lx", (long)tp); |
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DEBUG_ARG("errno = %d", errno);
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if (TCPS_HAVERCVDSYN(tp->t_state)) {
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tp->t_state = TCPS_CLOSED; |
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(void) tcp_output(tp);
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tcpstat.tcps_drops++; |
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} else
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tcpstat.tcps_conndrops++; |
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/* if (errno == ETIMEDOUT && tp->t_softerror)
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* errno = tp->t_softerror;
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*/
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/* so->so_error = errno; */
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return (tcp_close(tp));
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} |
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/*
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* Close a TCP control block:
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* discard all space held by the tcp
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* discard internet protocol block
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* wake up any sleepers
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*/
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struct tcpcb *
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tcp_close(tp) |
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register struct tcpcb *tp; |
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{ |
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register struct tcpiphdr *t; |
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struct socket *so = tp->t_socket;
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register struct mbuf *m; |
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DEBUG_CALL("tcp_close");
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DEBUG_ARG("tp = %lx", (long )tp); |
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/* free the reassembly queue, if any */
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t = (struct tcpiphdr *) tp->seg_next;
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while (t != (struct tcpiphdr *)tp) { |
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t = (struct tcpiphdr *)t->ti_next;
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m = (struct mbuf *) REASS_MBUF((struct tcpiphdr *)t->ti_prev); |
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remque_32((struct tcpiphdr *) t->ti_prev);
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m_freem(m); |
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} |
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/* It's static */
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/* if (tp->t_template)
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* (void) m_free(dtom(tp->t_template));
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*/
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/* free(tp, M_PCB); */
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free(tp); |
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so->so_tcpcb = 0;
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soisfdisconnected(so); |
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/* clobber input socket cache if we're closing the cached connection */
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if (so == tcp_last_so)
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tcp_last_so = &tcb; |
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close(so->s); |
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sbfree(&so->so_rcv); |
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sbfree(&so->so_snd); |
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sofree(so); |
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tcpstat.tcps_closed++; |
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return ((struct tcpcb *)0); |
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} |
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void
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tcp_drain() |
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{ |
315 |
/* XXX */
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} |
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/*
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* When a source quench is received, close congestion window
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* to one segment. We will gradually open it again as we proceed.
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*/
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#ifdef notdef
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void
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tcp_quench(i, errno) |
327 |
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int errno;
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{ |
330 |
struct tcpcb *tp = intotcpcb(inp);
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if (tp)
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tp->snd_cwnd = tp->t_maxseg; |
334 |
} |
335 |
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#endif /* notdef */ |
337 |
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/*
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* TCP protocol interface to socket abstraction.
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*/
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/*
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* User issued close, and wish to trail through shutdown states:
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* if never received SYN, just forget it. If got a SYN from peer,
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* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
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* If already got a FIN from peer, then almost done; go to LAST_ACK
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* state. In all other cases, have already sent FIN to peer (e.g.
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* after PRU_SHUTDOWN), and just have to play tedious game waiting
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* for peer to send FIN or not respond to keep-alives, etc.
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* We can let the user exit from the close as soon as the FIN is acked.
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*/
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void
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tcp_sockclosed(tp) |
354 |
struct tcpcb *tp;
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{ |
356 |
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DEBUG_CALL("tcp_sockclosed");
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DEBUG_ARG("tp = %lx", (long)tp); |
359 |
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switch (tp->t_state) {
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case TCPS_CLOSED:
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363 |
case TCPS_LISTEN:
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364 |
case TCPS_SYN_SENT:
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tp->t_state = TCPS_CLOSED; |
366 |
tp = tcp_close(tp); |
367 |
break;
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368 |
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369 |
case TCPS_SYN_RECEIVED:
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370 |
case TCPS_ESTABLISHED:
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tp->t_state = TCPS_FIN_WAIT_1; |
372 |
break;
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373 |
|
374 |
case TCPS_CLOSE_WAIT:
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375 |
tp->t_state = TCPS_LAST_ACK; |
376 |
break;
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377 |
} |
378 |
/* soisfdisconnecting(tp->t_socket); */
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379 |
if (tp && tp->t_state >= TCPS_FIN_WAIT_2)
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380 |
soisfdisconnected(tp->t_socket); |
381 |
if (tp)
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382 |
tcp_output(tp); |
383 |
} |
384 |
|
385 |
/*
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386 |
* Connect to a host on the Internet
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387 |
* Called by tcp_input
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388 |
* Only do a connect, the tcp fields will be set in tcp_input
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389 |
* return 0 if there's a result of the connect,
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390 |
* else return -1 means we're still connecting
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391 |
* The return value is almost always -1 since the socket is
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392 |
* nonblocking. Connect returns after the SYN is sent, and does
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393 |
* not wait for ACK+SYN.
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394 |
*/
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395 |
int tcp_fconnect(so)
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396 |
struct socket *so;
|
397 |
{ |
398 |
int ret=0; |
399 |
|
400 |
DEBUG_CALL("tcp_fconnect");
|
401 |
DEBUG_ARG("so = %lx", (long )so); |
402 |
|
403 |
if( (ret=so->s=socket(AF_INET,SOCK_STREAM,0)) >= 0) { |
404 |
int opt, s=so->s;
|
405 |
struct sockaddr_in addr;
|
406 |
|
407 |
fd_nonblock(s); |
408 |
opt = 1;
|
409 |
setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt )); |
410 |
opt = 1;
|
411 |
setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt )); |
412 |
|
413 |
addr.sin_family = AF_INET; |
414 |
if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) { |
415 |
/* It's an alias */
|
416 |
switch(ntohl(so->so_faddr.s_addr) & 0xff) { |
417 |
case CTL_DNS:
|
418 |
addr.sin_addr = dns_addr; |
419 |
break;
|
420 |
case CTL_ALIAS:
|
421 |
default:
|
422 |
addr.sin_addr = loopback_addr; |
423 |
break;
|
424 |
} |
425 |
} else
|
426 |
addr.sin_addr = so->so_faddr; |
427 |
addr.sin_port = so->so_fport; |
428 |
|
429 |
DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
|
430 |
"addr.sin_addr.s_addr=%.16s\n",
|
431 |
ntohs(addr.sin_port), inet_ntoa(addr.sin_addr))); |
432 |
/* We don't care what port we get */
|
433 |
ret = connect(s,(struct sockaddr *)&addr,sizeof (addr)); |
434 |
|
435 |
/*
|
436 |
* If it's not in progress, it failed, so we just return 0,
|
437 |
* without clearing SS_NOFDREF
|
438 |
*/
|
439 |
soisfconnecting(so); |
440 |
} |
441 |
|
442 |
return(ret);
|
443 |
} |
444 |
|
445 |
/*
|
446 |
* Accept the socket and connect to the local-host
|
447 |
*
|
448 |
* We have a problem. The correct thing to do would be
|
449 |
* to first connect to the local-host, and only if the
|
450 |
* connection is accepted, then do an accept() here.
|
451 |
* But, a) we need to know who's trying to connect
|
452 |
* to the socket to be able to SYN the local-host, and
|
453 |
* b) we are already connected to the foreign host by
|
454 |
* the time it gets to accept(), so... We simply accept
|
455 |
* here and SYN the local-host.
|
456 |
*/
|
457 |
void
|
458 |
tcp_connect(inso) |
459 |
struct socket *inso;
|
460 |
{ |
461 |
struct socket *so;
|
462 |
struct sockaddr_in addr;
|
463 |
int addrlen = sizeof(struct sockaddr_in); |
464 |
struct tcpcb *tp;
|
465 |
int s, opt;
|
466 |
|
467 |
DEBUG_CALL("tcp_connect");
|
468 |
DEBUG_ARG("inso = %lx", (long)inso); |
469 |
|
470 |
/*
|
471 |
* If it's an SS_ACCEPTONCE socket, no need to socreate()
|
472 |
* another socket, just use the accept() socket.
|
473 |
*/
|
474 |
if (inso->so_state & SS_FACCEPTONCE) {
|
475 |
/* FACCEPTONCE already have a tcpcb */
|
476 |
so = inso; |
477 |
} else {
|
478 |
if ((so = socreate()) == NULL) { |
479 |
/* If it failed, get rid of the pending connection */
|
480 |
close(accept(inso->s,(struct sockaddr *)&addr,&addrlen));
|
481 |
return;
|
482 |
} |
483 |
if (tcp_attach(so) < 0) { |
484 |
free(so); /* NOT sofree */
|
485 |
return;
|
486 |
} |
487 |
so->so_laddr = inso->so_laddr; |
488 |
so->so_lport = inso->so_lport; |
489 |
} |
490 |
|
491 |
(void) tcp_mss(sototcpcb(so), 0); |
492 |
|
493 |
if ((s = accept(inso->s,(struct sockaddr *)&addr,&addrlen)) < 0) { |
494 |
tcp_close(sototcpcb(so)); /* This will sofree() as well */
|
495 |
return;
|
496 |
} |
497 |
fd_nonblock(s); |
498 |
opt = 1;
|
499 |
setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); |
500 |
opt = 1;
|
501 |
setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); |
502 |
|
503 |
so->so_fport = addr.sin_port; |
504 |
so->so_faddr = addr.sin_addr; |
505 |
/* Translate connections from localhost to the real hostname */
|
506 |
if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr) |
507 |
so->so_faddr = our_addr; |
508 |
|
509 |
/* Close the accept() socket, set right state */
|
510 |
if (inso->so_state & SS_FACCEPTONCE) {
|
511 |
close(so->s); /* If we only accept once, close the accept() socket */
|
512 |
so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */
|
513 |
/* if it's not FACCEPTONCE, it's already NOFDREF */
|
514 |
} |
515 |
so->s = s; |
516 |
|
517 |
so->so_iptos = tcp_tos(so); |
518 |
tp = sototcpcb(so); |
519 |
|
520 |
tcp_template(tp); |
521 |
|
522 |
/* Compute window scaling to request. */
|
523 |
/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
|
524 |
* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
|
525 |
* tp->request_r_scale++;
|
526 |
*/
|
527 |
|
528 |
/* soisconnecting(so); */ /* NOFDREF used instead */ |
529 |
tcpstat.tcps_connattempt++; |
530 |
|
531 |
tp->t_state = TCPS_SYN_SENT; |
532 |
tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT; |
533 |
tp->iss = tcp_iss; |
534 |
tcp_iss += TCP_ISSINCR/2;
|
535 |
tcp_sendseqinit(tp); |
536 |
tcp_output(tp); |
537 |
} |
538 |
|
539 |
/*
|
540 |
* Attach a TCPCB to a socket.
|
541 |
*/
|
542 |
int
|
543 |
tcp_attach(so) |
544 |
struct socket *so;
|
545 |
{ |
546 |
if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) |
547 |
return -1; |
548 |
|
549 |
insque(so, &tcb); |
550 |
|
551 |
return 0; |
552 |
} |
553 |
|
554 |
/*
|
555 |
* Set the socket's type of service field
|
556 |
*/
|
557 |
struct tos_t tcptos[] = {
|
558 |
{0, 20, IPTOS_THROUGHPUT, 0}, /* ftp data */ |
559 |
{21, 21, IPTOS_LOWDELAY, EMU_FTP}, /* ftp control */ |
560 |
{0, 23, IPTOS_LOWDELAY, 0}, /* telnet */ |
561 |
{0, 80, IPTOS_THROUGHPUT, 0}, /* WWW */ |
562 |
{0, 513, IPTOS_LOWDELAY, EMU_RLOGIN|EMU_NOCONNECT}, /* rlogin */ |
563 |
{0, 514, IPTOS_LOWDELAY, EMU_RSH|EMU_NOCONNECT}, /* shell */ |
564 |
{0, 544, IPTOS_LOWDELAY, EMU_KSH}, /* kshell */ |
565 |
{0, 543, IPTOS_LOWDELAY, 0}, /* klogin */ |
566 |
{0, 6667, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC */ |
567 |
{0, 6668, IPTOS_THROUGHPUT, EMU_IRC}, /* IRC undernet */ |
568 |
{0, 7070, IPTOS_LOWDELAY, EMU_REALAUDIO }, /* RealAudio control */ |
569 |
{0, 113, IPTOS_LOWDELAY, EMU_IDENT }, /* identd protocol */ |
570 |
{0, 0, 0, 0} |
571 |
}; |
572 |
|
573 |
struct emu_t *tcpemu = 0; |
574 |
|
575 |
/*
|
576 |
* Return TOS according to the above table
|
577 |
*/
|
578 |
u_int8_t |
579 |
tcp_tos(so) |
580 |
struct socket *so;
|
581 |
{ |
582 |
int i = 0; |
583 |
struct emu_t *emup;
|
584 |
|
585 |
while(tcptos[i].tos) {
|
586 |
if ((tcptos[i].fport && (ntohs(so->so_fport) == tcptos[i].fport)) ||
|
587 |
(tcptos[i].lport && (ntohs(so->so_lport) == tcptos[i].lport))) { |
588 |
so->so_emu = tcptos[i].emu; |
589 |
return tcptos[i].tos;
|
590 |
} |
591 |
i++; |
592 |
} |
593 |
|
594 |
/* Nope, lets see if there's a user-added one */
|
595 |
for (emup = tcpemu; emup; emup = emup->next) {
|
596 |
if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
|
597 |
(emup->lport && (ntohs(so->so_lport) == emup->lport))) { |
598 |
so->so_emu = emup->emu; |
599 |
return emup->tos;
|
600 |
} |
601 |
} |
602 |
|
603 |
return 0; |
604 |
} |
605 |
|
606 |
int do_echo = -1; |
607 |
|
608 |
/*
|
609 |
* Emulate programs that try and connect to us
|
610 |
* This includes ftp (the data connection is
|
611 |
* initiated by the server) and IRC (DCC CHAT and
|
612 |
* DCC SEND) for now
|
613 |
*
|
614 |
* NOTE: It's possible to crash SLiRP by sending it
|
615 |
* unstandard strings to emulate... if this is a problem,
|
616 |
* more checks are needed here
|
617 |
*
|
618 |
* XXX Assumes the whole command came in one packet
|
619 |
*
|
620 |
* XXX Some ftp clients will have their TOS set to
|
621 |
* LOWDELAY and so Nagel will kick in. Because of this,
|
622 |
* we'll get the first letter, followed by the rest, so
|
623 |
* we simply scan for ORT instead of PORT...
|
624 |
* DCC doesn't have this problem because there's other stuff
|
625 |
* in the packet before the DCC command.
|
626 |
*
|
627 |
* Return 1 if the mbuf m is still valid and should be
|
628 |
* sbappend()ed
|
629 |
*
|
630 |
* NOTE: if you return 0 you MUST m_free() the mbuf!
|
631 |
*/
|
632 |
int
|
633 |
tcp_emu(so, m) |
634 |
struct socket *so;
|
635 |
struct mbuf *m;
|
636 |
{ |
637 |
u_int n1, n2, n3, n4, n5, n6; |
638 |
char buff[256]; |
639 |
u_int32_t laddr; |
640 |
u_int lport; |
641 |
char *bptr;
|
642 |
|
643 |
DEBUG_CALL("tcp_emu");
|
644 |
DEBUG_ARG("so = %lx", (long)so); |
645 |
DEBUG_ARG("m = %lx", (long)m); |
646 |
|
647 |
switch(so->so_emu) {
|
648 |
int x, i;
|
649 |
|
650 |
case EMU_IDENT:
|
651 |
/*
|
652 |
* Identification protocol as per rfc-1413
|
653 |
*/
|
654 |
|
655 |
{ |
656 |
struct socket *tmpso;
|
657 |
struct sockaddr_in addr;
|
658 |
int addrlen = sizeof(struct sockaddr_in); |
659 |
struct sbuf *so_rcv = &so->so_rcv;
|
660 |
|
661 |
memcpy(so_rcv->sb_wptr, m->m_data, m->m_len); |
662 |
so_rcv->sb_wptr += m->m_len; |
663 |
so_rcv->sb_rptr += m->m_len; |
664 |
m->m_data[m->m_len] = 0; /* NULL terminate */ |
665 |
if (strchr(m->m_data, '\r') || strchr(m->m_data, '\n')) { |
666 |
if (sscanf(so_rcv->sb_data, "%d%*[ ,]%d", &n1, &n2) == 2) { |
667 |
HTONS(n1); |
668 |
HTONS(n2); |
669 |
/* n2 is the one on our host */
|
670 |
for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
|
671 |
if (tmpso->so_laddr.s_addr == so->so_laddr.s_addr &&
|
672 |
tmpso->so_lport == n2 && |
673 |
tmpso->so_faddr.s_addr == so->so_faddr.s_addr && |
674 |
tmpso->so_fport == n1) { |
675 |
if (getsockname(tmpso->s,
|
676 |
(struct sockaddr *)&addr, &addrlen) == 0) |
677 |
n2 = ntohs(addr.sin_port); |
678 |
break;
|
679 |
} |
680 |
} |
681 |
} |
682 |
so_rcv->sb_cc = sprintf(so_rcv->sb_data, "%d,%d\r\n", n1, n2);
|
683 |
so_rcv->sb_rptr = so_rcv->sb_data; |
684 |
so_rcv->sb_wptr = so_rcv->sb_data + so_rcv->sb_cc; |
685 |
} |
686 |
m_free(m); |
687 |
return 0; |
688 |
} |
689 |
|
690 |
#if 0
|
691 |
case EMU_RLOGIN:
|
692 |
/*
|
693 |
* Rlogin emulation
|
694 |
* First we accumulate all the initial option negotiation,
|
695 |
* then fork_exec() rlogin according to the options
|
696 |
*/
|
697 |
{
|
698 |
int i, i2, n;
|
699 |
char *ptr;
|
700 |
char args[100];
|
701 |
char term[100];
|
702 |
struct sbuf *so_snd = &so->so_snd;
|
703 |
struct sbuf *so_rcv = &so->so_rcv;
|
704 |
|
705 |
/* First check if they have a priveladged port, or too much data has arrived */
|
706 |
if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 ||
|
707 |
(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) {
|
708 |
memcpy(so_snd->sb_wptr, "Permission denied\n", 18);
|
709 |
so_snd->sb_wptr += 18;
|
710 |
so_snd->sb_cc += 18;
|
711 |
tcp_sockclosed(sototcpcb(so));
|
712 |
m_free(m);
|
713 |
return 0;
|
714 |
}
|
715 |
|
716 |
/* Append the current data */
|
717 |
memcpy(so_rcv->sb_wptr, m->m_data, m->m_len);
|
718 |
so_rcv->sb_wptr += m->m_len;
|
719 |
so_rcv->sb_rptr += m->m_len;
|
720 |
m_free(m);
|
721 |
|
722 |
/*
|
723 |
* Check if we have all the initial options,
|
724 |
* and build argument list to rlogin while we're here
|
725 |
*/
|
726 |
n = 0;
|
727 |
ptr = so_rcv->sb_data;
|
728 |
args[0] = 0;
|
729 |
term[0] = 0;
|
730 |
while (ptr < so_rcv->sb_wptr) {
|
731 |
if (*ptr++ == 0) {
|
732 |
n++;
|
733 |
if (n == 2) {
|
734 |
sprintf(args, "rlogin -l %s %s",
|
735 |
ptr, inet_ntoa(so->so_faddr));
|
736 |
} else if (n == 3) {
|
737 |
i2 = so_rcv->sb_wptr - ptr;
|
738 |
for (i = 0; i < i2; i++) {
|
739 |
if (ptr[i] == '/') {
|
740 |
ptr[i] = 0;
|
741 |
#ifdef HAVE_SETENV
|
742 |
sprintf(term, "%s", ptr);
|
743 |
#else
|
744 |
sprintf(term, "TERM=%s", ptr);
|
745 |
#endif
|
746 |
ptr[i] = '/';
|
747 |
break;
|
748 |
} |
749 |
} |
750 |
} |
751 |
} |
752 |
} |
753 |
|
754 |
if (n != 4) |
755 |
return 0; |
756 |
|
757 |
/* We have it, set our term variable and fork_exec() */
|
758 |
#ifdef HAVE_SETENV
|
759 |
setenv("TERM", term, 1); |
760 |
#else
|
761 |
putenv(term); |
762 |
#endif
|
763 |
fork_exec(so, args, 2);
|
764 |
term[0] = 0; |
765 |
so->so_emu = 0;
|
766 |
|
767 |
/* And finally, send the client a 0 character */
|
768 |
so_snd->sb_wptr[0] = 0; |
769 |
so_snd->sb_wptr++; |
770 |
so_snd->sb_cc++; |
771 |
|
772 |
return 0; |
773 |
} |
774 |
|
775 |
case EMU_RSH:
|
776 |
/*
|
777 |
* rsh emulation
|
778 |
* First we accumulate all the initial option negotiation,
|
779 |
* then rsh_exec() rsh according to the options
|
780 |
*/
|
781 |
{ |
782 |
int n;
|
783 |
char *ptr;
|
784 |
char *user;
|
785 |
char *args;
|
786 |
struct sbuf *so_snd = &so->so_snd;
|
787 |
struct sbuf *so_rcv = &so->so_rcv;
|
788 |
|
789 |
/* First check if they have a priveladged port, or too much data has arrived */
|
790 |
if (ntohs(so->so_lport) > 1023 || ntohs(so->so_lport) < 512 || |
791 |
(m->m_len + so_rcv->sb_wptr) > (so_rcv->sb_data + so_rcv->sb_datalen)) { |
792 |
memcpy(so_snd->sb_wptr, "Permission denied\n", 18); |
793 |
so_snd->sb_wptr += 18;
|
794 |
so_snd->sb_cc += 18;
|
795 |
tcp_sockclosed(sototcpcb(so)); |
796 |
m_free(m); |
797 |
return 0; |
798 |
} |
799 |
|
800 |
/* Append the current data */
|
801 |
memcpy(so_rcv->sb_wptr, m->m_data, m->m_len); |
802 |
so_rcv->sb_wptr += m->m_len; |
803 |
so_rcv->sb_rptr += m->m_len; |
804 |
m_free(m); |
805 |
|
806 |
/*
|
807 |
* Check if we have all the initial options,
|
808 |
* and build argument list to rlogin while we're here
|
809 |
*/
|
810 |
n = 0;
|
811 |
ptr = so_rcv->sb_data; |
812 |
user="";
|
813 |
args="";
|
814 |
if (so->extra==NULL) { |
815 |
struct socket *ns;
|
816 |
struct tcpcb* tp;
|
817 |
int port=atoi(ptr);
|
818 |
if (port <= 0) return 0; |
819 |
if (port > 1023 || port < 512) { |
820 |
memcpy(so_snd->sb_wptr, "Permission denied\n", 18); |
821 |
so_snd->sb_wptr += 18;
|
822 |
so_snd->sb_cc += 18;
|
823 |
tcp_sockclosed(sototcpcb(so)); |
824 |
return 0; |
825 |
} |
826 |
if ((ns=socreate()) == NULL) |
827 |
return 0; |
828 |
if (tcp_attach(ns)<0) { |
829 |
free(ns); |
830 |
return 0; |
831 |
} |
832 |
|
833 |
ns->so_laddr=so->so_laddr; |
834 |
ns->so_lport=htons(port); |
835 |
|
836 |
(void) tcp_mss(sototcpcb(ns), 0); |
837 |
|
838 |
ns->so_faddr=so->so_faddr; |
839 |
ns->so_fport=htons(IPPORT_RESERVED-1); /* Use a fake port. */ |
840 |
|
841 |
if (ns->so_faddr.s_addr == 0 || |
842 |
ns->so_faddr.s_addr == loopback_addr.s_addr) |
843 |
ns->so_faddr = our_addr; |
844 |
|
845 |
ns->so_iptos = tcp_tos(ns); |
846 |
tp = sototcpcb(ns); |
847 |
|
848 |
tcp_template(tp); |
849 |
|
850 |
/* Compute window scaling to request. */
|
851 |
/* while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
|
852 |
* (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat)
|
853 |
* tp->request_r_scale++;
|
854 |
*/
|
855 |
|
856 |
/*soisfconnecting(ns);*/
|
857 |
|
858 |
tcpstat.tcps_connattempt++; |
859 |
|
860 |
tp->t_state = TCPS_SYN_SENT; |
861 |
tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT; |
862 |
tp->iss = tcp_iss; |
863 |
tcp_iss += TCP_ISSINCR/2;
|
864 |
tcp_sendseqinit(tp); |
865 |
tcp_output(tp); |
866 |
so->extra=ns; |
867 |
} |
868 |
while (ptr < so_rcv->sb_wptr) {
|
869 |
if (*ptr++ == 0) { |
870 |
n++; |
871 |
if (n == 2) { |
872 |
user=ptr; |
873 |
} else if (n == 3) { |
874 |
args=ptr; |
875 |
} |
876 |
} |
877 |
} |
878 |
|
879 |
if (n != 4) |
880 |
return 0; |
881 |
|
882 |
rsh_exec(so,so->extra, user, inet_ntoa(so->so_faddr), args); |
883 |
so->so_emu = 0;
|
884 |
so->extra=NULL;
|
885 |
|
886 |
/* And finally, send the client a 0 character */
|
887 |
so_snd->sb_wptr[0] = 0; |
888 |
so_snd->sb_wptr++; |
889 |
so_snd->sb_cc++; |
890 |
|
891 |
return 0; |
892 |
} |
893 |
|
894 |
case EMU_CTL:
|
895 |
{ |
896 |
int num;
|
897 |
struct sbuf *so_snd = &so->so_snd;
|
898 |
struct sbuf *so_rcv = &so->so_rcv;
|
899 |
|
900 |
/*
|
901 |
* If there is binary data here, we save it in so->so_m
|
902 |
*/
|
903 |
if (!so->so_m) {
|
904 |
int rxlen;
|
905 |
char *rxdata;
|
906 |
rxdata=mtod(m, char *);
|
907 |
for (rxlen=m->m_len; rxlen; rxlen--) {
|
908 |
if (*rxdata++ & 0x80) { |
909 |
so->so_m = m; |
910 |
return 0; |
911 |
} |
912 |
} |
913 |
} /* if(so->so_m==NULL) */
|
914 |
|
915 |
/*
|
916 |
* Append the line
|
917 |
*/
|
918 |
sbappendsb(so_rcv, m); |
919 |
|
920 |
/* To avoid going over the edge of the buffer, we reset it */
|
921 |
if (so_snd->sb_cc == 0) |
922 |
so_snd->sb_wptr = so_snd->sb_rptr = so_snd->sb_data; |
923 |
|
924 |
/*
|
925 |
* A bit of a hack:
|
926 |
* If the first packet we get here is 1 byte long, then it
|
927 |
* was done in telnet character mode, therefore we must echo
|
928 |
* the characters as they come. Otherwise, we echo nothing,
|
929 |
* because in linemode, the line is already echoed
|
930 |
* XXX two or more control connections won't work
|
931 |
*/
|
932 |
if (do_echo == -1) { |
933 |
if (m->m_len == 1) do_echo = 1; |
934 |
else do_echo = 0; |
935 |
} |
936 |
if (do_echo) {
|
937 |
sbappendsb(so_snd, m); |
938 |
m_free(m); |
939 |
tcp_output(sototcpcb(so)); /* XXX */
|
940 |
} else
|
941 |
m_free(m); |
942 |
|
943 |
num = 0;
|
944 |
while (num < so->so_rcv.sb_cc) {
|
945 |
if (*(so->so_rcv.sb_rptr + num) == '\n' || |
946 |
*(so->so_rcv.sb_rptr + num) == '\r') {
|
947 |
int n;
|
948 |
|
949 |
*(so_rcv->sb_rptr + num) = 0;
|
950 |
if (ctl_password && !ctl_password_ok) {
|
951 |
/* Need a password */
|
952 |
if (sscanf(so_rcv->sb_rptr, "pass %256s", buff) == 1) { |
953 |
if (strcmp(buff, ctl_password) == 0) { |
954 |
ctl_password_ok = 1;
|
955 |
n = sprintf(so_snd->sb_wptr, |
956 |
"Password OK.\r\n");
|
957 |
goto do_prompt;
|
958 |
} |
959 |
} |
960 |
n = sprintf(so_snd->sb_wptr, |
961 |
"Error: Password required, log on with \"pass PASSWORD\"\r\n");
|
962 |
goto do_prompt;
|
963 |
} |
964 |
cfg_quitting = 0;
|
965 |
n = do_config(so_rcv->sb_rptr, so, PRN_SPRINTF); |
966 |
if (!cfg_quitting) {
|
967 |
/* Register the printed data */
|
968 |
do_prompt:
|
969 |
so_snd->sb_cc += n; |
970 |
so_snd->sb_wptr += n; |
971 |
/* Add prompt */
|
972 |
n = sprintf(so_snd->sb_wptr, "Slirp> ");
|
973 |
so_snd->sb_cc += n; |
974 |
so_snd->sb_wptr += n; |
975 |
} |
976 |
/* Drop so_rcv data */
|
977 |
so_rcv->sb_cc = 0;
|
978 |
so_rcv->sb_wptr = so_rcv->sb_rptr = so_rcv->sb_data; |
979 |
tcp_output(sototcpcb(so)); /* Send the reply */
|
980 |
} |
981 |
num++; |
982 |
} |
983 |
return 0; |
984 |
} |
985 |
#endif
|
986 |
case EMU_FTP: /* ftp */ |
987 |
*(m->m_data+m->m_len) = 0; /* NULL terminate for strstr */ |
988 |
if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) { |
989 |
/*
|
990 |
* Need to emulate the PORT command
|
991 |
*/
|
992 |
x = sscanf(bptr, "ORT %d,%d,%d,%d,%d,%d\r\n%256[^\177]",
|
993 |
&n1, &n2, &n3, &n4, &n5, &n6, buff); |
994 |
if (x < 6) |
995 |
return 1; |
996 |
|
997 |
laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4)); |
998 |
lport = htons((n5 << 8) | (n6));
|
999 |
|
1000 |
if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL) |
1001 |
return 1; |
1002 |
|
1003 |
n6 = ntohs(so->so_fport); |
1004 |
|
1005 |
n5 = (n6 >> 8) & 0xff; |
1006 |
n6 &= 0xff;
|
1007 |
|
1008 |
laddr = ntohl(so->so_faddr.s_addr); |
1009 |
|
1010 |
n1 = ((laddr >> 24) & 0xff); |
1011 |
n2 = ((laddr >> 16) & 0xff); |
1012 |
n3 = ((laddr >> 8) & 0xff); |
1013 |
n4 = (laddr & 0xff);
|
1014 |
|
1015 |
m->m_len = bptr - m->m_data; /* Adjust length */
|
1016 |
m->m_len += sprintf(bptr,"ORT %d,%d,%d,%d,%d,%d\r\n%s",
|
1017 |
n1, n2, n3, n4, n5, n6, x==7?buff:""); |
1018 |
return 1; |
1019 |
} else if ((bptr = (char *)strstr(m->m_data, "27 Entering")) != NULL) { |
1020 |
/*
|
1021 |
* Need to emulate the PASV response
|
1022 |
*/
|
1023 |
x = sscanf(bptr, "27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%256[^\177]",
|
1024 |
&n1, &n2, &n3, &n4, &n5, &n6, buff); |
1025 |
if (x < 6) |
1026 |
return 1; |
1027 |
|
1028 |
laddr = htonl((n1 << 24) | (n2 << 16) | (n3 << 8) | (n4)); |
1029 |
lport = htons((n5 << 8) | (n6));
|
1030 |
|
1031 |
if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL) |
1032 |
return 1; |
1033 |
|
1034 |
n6 = ntohs(so->so_fport); |
1035 |
|
1036 |
n5 = (n6 >> 8) & 0xff; |
1037 |
n6 &= 0xff;
|
1038 |
|
1039 |
laddr = ntohl(so->so_faddr.s_addr); |
1040 |
|
1041 |
n1 = ((laddr >> 24) & 0xff); |
1042 |
n2 = ((laddr >> 16) & 0xff); |
1043 |
n3 = ((laddr >> 8) & 0xff); |
1044 |
n4 = (laddr & 0xff);
|
1045 |
|
1046 |
m->m_len = bptr - m->m_data; /* Adjust length */
|
1047 |
m->m_len += sprintf(bptr,"27 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\r\n%s",
|
1048 |
n1, n2, n3, n4, n5, n6, x==7?buff:""); |
1049 |
|
1050 |
return 1; |
1051 |
} |
1052 |
|
1053 |
return 1; |
1054 |
|
1055 |
case EMU_KSH:
|
1056 |
/*
|
1057 |
* The kshell (Kerberos rsh) and shell services both pass
|
1058 |
* a local port port number to carry signals to the server
|
1059 |
* and stderr to the client. It is passed at the beginning
|
1060 |
* of the connection as a NUL-terminated decimal ASCII string.
|
1061 |
*/
|
1062 |
so->so_emu = 0;
|
1063 |
for (lport = 0, i = 0; i < m->m_len-1; ++i) { |
1064 |
if (m->m_data[i] < '0' || m->m_data[i] > '9') |
1065 |
return 1; /* invalid number */ |
1066 |
lport *= 10;
|
1067 |
lport += m->m_data[i] - '0';
|
1068 |
} |
1069 |
if (m->m_data[m->m_len-1] == '\0' && lport != 0 && |
1070 |
(so = solisten(0, so->so_laddr.s_addr, htons(lport), SS_FACCEPTONCE)) != NULL) |
1071 |
m->m_len = sprintf(m->m_data, "%d", ntohs(so->so_fport))+1; |
1072 |
return 1; |
1073 |
|
1074 |
case EMU_IRC:
|
1075 |
/*
|
1076 |
* Need to emulate DCC CHAT, DCC SEND and DCC MOVE
|
1077 |
*/
|
1078 |
*(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */ |
1079 |
if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL) |
1080 |
return 1; |
1081 |
|
1082 |
/* The %256s is for the broken mIRC */
|
1083 |
if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) { |
1084 |
if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL) |
1085 |
return 1; |
1086 |
|
1087 |
m->m_len = bptr - m->m_data; /* Adjust length */
|
1088 |
m->m_len += sprintf(bptr, "DCC CHAT chat %lu %u%c\n",
|
1089 |
(unsigned long)ntohl(so->so_faddr.s_addr), |
1090 |
ntohs(so->so_fport), 1);
|
1091 |
} else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) { |
1092 |
if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL) |
1093 |
return 1; |
1094 |
|
1095 |
m->m_len = bptr - m->m_data; /* Adjust length */
|
1096 |
m->m_len += sprintf(bptr, "DCC SEND %s %lu %u %u%c\n",
|
1097 |
buff, (unsigned long)ntohl(so->so_faddr.s_addr), |
1098 |
ntohs(so->so_fport), n1, 1);
|
1099 |
} else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) { |
1100 |
if ((so = solisten(0, htonl(laddr), htons(lport), SS_FACCEPTONCE)) == NULL) |
1101 |
return 1; |
1102 |
|
1103 |
m->m_len = bptr - m->m_data; /* Adjust length */
|
1104 |
m->m_len += sprintf(bptr, "DCC MOVE %s %lu %u %u%c\n",
|
1105 |
buff, (unsigned long)ntohl(so->so_faddr.s_addr), |
1106 |
ntohs(so->so_fport), n1, 1);
|
1107 |
} |
1108 |
return 1; |
1109 |
|
1110 |
case EMU_REALAUDIO:
|
1111 |
/*
|
1112 |
* RealAudio emulation - JP. We must try to parse the incoming
|
1113 |
* data and try to find the two characters that contain the
|
1114 |
* port number. Then we redirect an udp port and replace the
|
1115 |
* number with the real port we got.
|
1116 |
*
|
1117 |
* The 1.0 beta versions of the player are not supported
|
1118 |
* any more.
|
1119 |
*
|
1120 |
* A typical packet for player version 1.0 (release version):
|
1121 |
*
|
1122 |
* 0000:50 4E 41 00 05
|
1123 |
* 0000:00 01 00 02 1B D7 00 00 67 E6 6C DC 63 00 12 50 .....?..g?l?c..P
|
1124 |
* 0010:4E 43 4C 49 45 4E 54 20 31 30 31 20 41 4C 50 48 NCLIENT 101 ALPH
|
1125 |
* 0020:41 6C 00 00 52 00 17 72 61 66 69 6C 65 73 2F 76 Al..R..rafiles/v
|
1126 |
* 0030:6F 61 2F 65 6E 67 6C 69 73 68 5F 2E 72 61 79 42 oa/english_.rayB
|
1127 |
*
|
1128 |
* Now the port number 0x1BD7 is found at offset 0x04 of the
|
1129 |
* Now the port number 0x1BD7 is found at offset 0x04 of the
|
1130 |
* second packet. This time we received five bytes first and
|
1131 |
* then the rest. You never know how many bytes you get.
|
1132 |
*
|
1133 |
* A typical packet for player version 2.0 (beta):
|
1134 |
*
|
1135 |
* 0000:50 4E 41 00 06 00 02 00 00 00 01 00 02 1B C1 00 PNA...........?.
|
1136 |
* 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .gux?c..Win2.0.0
|
1137 |
* 0020:2E 35 6C 00 00 52 00 1C 72 61 66 69 6C 65 73 2F .5l..R..rafiles/
|
1138 |
* 0030:77 65 62 73 69 74 65 2F 32 30 72 65 6C 65 61 73 website/20releas
|
1139 |
* 0040:65 2E 72 61 79 53 00 00 06 36 42 e.rayS...6B
|
1140 |
*
|
1141 |
* Port number 0x1BC1 is found at offset 0x0d.
|
1142 |
*
|
1143 |
* This is just a horrible switch statement. Variable ra tells
|
1144 |
* us where we're going.
|
1145 |
*/
|
1146 |
|
1147 |
bptr = m->m_data; |
1148 |
while (bptr < m->m_data + m->m_len) {
|
1149 |
u_short p; |
1150 |
static int ra = 0; |
1151 |
char ra_tbl[4]; |
1152 |
|
1153 |
ra_tbl[0] = 0x50; |
1154 |
ra_tbl[1] = 0x4e; |
1155 |
ra_tbl[2] = 0x41; |
1156 |
ra_tbl[3] = 0; |
1157 |
|
1158 |
switch (ra) {
|
1159 |
case 0: |
1160 |
case 2: |
1161 |
case 3: |
1162 |
if (*bptr++ != ra_tbl[ra]) {
|
1163 |
ra = 0;
|
1164 |
continue;
|
1165 |
} |
1166 |
break;
|
1167 |
|
1168 |
case 1: |
1169 |
/*
|
1170 |
* We may get 0x50 several times, ignore them
|
1171 |
*/
|
1172 |
if (*bptr == 0x50) { |
1173 |
ra = 1;
|
1174 |
bptr++; |
1175 |
continue;
|
1176 |
} else if (*bptr++ != ra_tbl[ra]) { |
1177 |
ra = 0;
|
1178 |
continue;
|
1179 |
} |
1180 |
break;
|
1181 |
|
1182 |
case 4: |
1183 |
/*
|
1184 |
* skip version number
|
1185 |
*/
|
1186 |
bptr++; |
1187 |
break;
|
1188 |
|
1189 |
case 5: |
1190 |
/*
|
1191 |
* The difference between versions 1.0 and
|
1192 |
* 2.0 is here. For future versions of
|
1193 |
* the player this may need to be modified.
|
1194 |
*/
|
1195 |
if (*(bptr + 1) == 0x02) |
1196 |
bptr += 8;
|
1197 |
else
|
1198 |
bptr += 4;
|
1199 |
break;
|
1200 |
|
1201 |
case 6: |
1202 |
/* This is the field containing the port
|
1203 |
* number that RA-player is listening to.
|
1204 |
*/
|
1205 |
lport = (((u_char*)bptr)[0] << 8) |
1206 |
+ ((u_char *)bptr)[1];
|
1207 |
if (lport < 6970) |
1208 |
lport += 256; /* don't know why */ |
1209 |
if (lport < 6970 || lport > 7170) |
1210 |
return 1; /* failed */ |
1211 |
|
1212 |
/* try to get udp port between 6970 - 7170 */
|
1213 |
for (p = 6970; p < 7071; p++) { |
1214 |
if (udp_listen( htons(p),
|
1215 |
so->so_laddr.s_addr, |
1216 |
htons(lport), |
1217 |
SS_FACCEPTONCE)) { |
1218 |
break;
|
1219 |
} |
1220 |
} |
1221 |
if (p == 7071) |
1222 |
p = 0;
|
1223 |
*(u_char *)bptr++ = (p >> 8) & 0xff; |
1224 |
*(u_char *)bptr++ = p & 0xff;
|
1225 |
ra = 0;
|
1226 |
return 1; /* port redirected, we're done */ |
1227 |
break;
|
1228 |
|
1229 |
default:
|
1230 |
ra = 0;
|
1231 |
} |
1232 |
ra++; |
1233 |
} |
1234 |
return 1; |
1235 |
|
1236 |
default:
|
1237 |
/* Ooops, not emulated, won't call tcp_emu again */
|
1238 |
so->so_emu = 0;
|
1239 |
return 1; |
1240 |
} |
1241 |
} |
1242 |
|
1243 |
/*
|
1244 |
* Do misc. config of SLiRP while its running.
|
1245 |
* Return 0 if this connections is to be closed, 1 otherwise,
|
1246 |
* return 2 if this is a command-line connection
|
1247 |
*/
|
1248 |
int
|
1249 |
tcp_ctl(so) |
1250 |
struct socket *so;
|
1251 |
{ |
1252 |
#if 0
|
1253 |
struct sbuf *sb = &so->so_snd;
|
1254 |
int command;
|
1255 |
struct ex_list *ex_ptr;
|
1256 |
int do_pty;
|
1257 |
struct socket *tmpso;
|
1258 |
|
1259 |
DEBUG_CALL("tcp_ctl");
|
1260 |
DEBUG_ARG("so = %lx", (long )so);
|
1261 |
|
1262 |
/*
|
1263 |
* Check if they're authorised
|
1264 |
*/
|
1265 |
if (ctl_addr.s_addr && (ctl_addr.s_addr == -1 || (so->so_laddr.s_addr != ctl_addr.s_addr))) {
|
1266 |
sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n");
|
1267 |
sb->sb_wptr += sb->sb_cc;
|
1268 |
return 0;
|
1269 |
}
|
1270 |
|
1271 |
command = (ntohl(so->so_faddr.s_addr) & 0xff);
|
1272 |
|
1273 |
switch(command) {
|
1274 |
default: /* Check for exec's */
|
1275 |
|
1276 |
/*
|
1277 |
* Check if it's pty_exec
|
1278 |
*/
|
1279 |
for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
1280 |
if (ex_ptr->ex_fport == so->so_fport &&
|
1281 |
command == ex_ptr->ex_addr) {
|
1282 |
do_pty = ex_ptr->ex_pty;
|
1283 |
goto do_exec;
|
1284 |
}
|
1285 |
}
|
1286 |
|
1287 |
/*
|
1288 |
* Nothing bound..
|
1289 |
*/
|
1290 |
/* tcp_fconnect(so); */
|
1291 |
|
1292 |
/* FALLTHROUGH */
|
1293 |
case CTL_ALIAS:
|
1294 |
sb->sb_cc = sprintf(sb->sb_wptr,
|
1295 |
"Error: No application configured.\r\n");
|
1296 |
sb->sb_wptr += sb->sb_cc;
|
1297 |
return(0);
|
1298 |
|
1299 |
do_exec:
|
1300 |
DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec));
|
1301 |
return(fork_exec(so, ex_ptr->ex_exec, do_pty));
|
1302 |
|
1303 |
case CTL_CMD:
|
1304 |
for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) {
|
1305 |
if (tmpso->so_emu == EMU_CTL &&
|
1306 |
!(tmpso->so_tcpcb?
|
1307 |
(tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK))
|
1308 |
:0)) {
|
1309 |
/* Ooops, control connection already active */
|
1310 |
sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n");
|
1311 |
sb->sb_wptr += sb->sb_cc;
|
1312 |
return 0;
|
1313 |
}
|
1314 |
}
|
1315 |
so->so_emu = EMU_CTL;
|
1316 |
ctl_password_ok = 0;
|
1317 |
sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> ");
|
1318 |
sb->sb_wptr += sb->sb_cc;
|
1319 |
do_echo=-1;
|
1320 |
return(2);
|
1321 |
}
|
1322 |
#else
|
1323 |
return 0; |
1324 |
#endif
|
1325 |
} |