mirror of https://github.com/proxmox/mirror_qemu
929 lines
26 KiB
C
929 lines
26 KiB
C
/*
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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. 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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#include <slirp.h>
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/* patchable/settable parameters for tcp */
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/* Don't do rfc1323 performance enhancements */
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#define TCP_DO_RFC1323 0
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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(Slirp *slirp)
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{
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slirp->tcp_iss = 1; /* wrong */
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slirp->tcb.so_next = slirp->tcb.so_prev = &slirp->tcb;
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slirp->tcp_last_so = &slirp->tcb;
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}
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void tcp_cleanup(Slirp *slirp)
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{
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while (slirp->tcb.so_next != &slirp->tcb) {
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tcp_close(sototcpcb(slirp->tcb.so_next));
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}
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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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void
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tcp_template(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_mbuf = NULL;
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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(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
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tcp_seq ack, tcp_seq seq, 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 = %p", tp);
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DEBUG_ARG("ti = %p", ti);
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DEBUG_ARG("m = %p", 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 == NULL) {
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if (!tp || (m = m_get(tp->t_socket->slirp)) == NULL)
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return;
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tlen = 0;
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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, uint32_t);
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xchg(ti->ti_dport, ti->ti_sport, uint16_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_mbuf = NULL;
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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((uint16_t) (win >> tp->rcv_scale));
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else
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ti->ti_win = htons((uint16_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 = IPDEFTTL;
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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(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 = (struct tcpiphdr*)tp;
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tp->t_maxseg = TCP_MSS;
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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 = TCPTV_SRTTDFLT << 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 err)
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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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}
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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(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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Slirp *slirp = so->slirp;
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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 = tcpfrag_list_first(tp);
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while (!tcpfrag_list_end(t, tp)) {
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t = tcpiphdr_next(t);
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m = tcpiphdr_prev(t)->ti_mbuf;
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remque(tcpiphdr2qlink(tcpiphdr_prev(t)));
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m_free(m);
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}
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free(tp);
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so->so_tcpcb = NULL;
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/* clobber input socket cache if we're closing the cached connection */
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if (so == slirp->tcp_last_so)
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slirp->tcp_last_so = &slirp->tcb;
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closesocket(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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return ((struct tcpcb *)0);
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}
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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(struct tcpcb *tp)
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{
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DEBUG_CALL("tcp_sockclosed");
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DEBUG_ARG("tp = %lx", (long)tp);
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switch (tp->t_state) {
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case TCPS_CLOSED:
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case TCPS_LISTEN:
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case TCPS_SYN_SENT:
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tp->t_state = TCPS_CLOSED;
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tp = tcp_close(tp);
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break;
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case TCPS_SYN_RECEIVED:
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case TCPS_ESTABLISHED:
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tp->t_state = TCPS_FIN_WAIT_1;
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break;
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case TCPS_CLOSE_WAIT:
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tp->t_state = TCPS_LAST_ACK;
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break;
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}
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if (tp)
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tcp_output(tp);
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}
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/*
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* Connect to a host on the Internet
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* Called by tcp_input
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* Only do a connect, the tcp fields will be set in tcp_input
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* return 0 if there's a result of the connect,
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* else return -1 means we're still connecting
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* The return value is almost always -1 since the socket is
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* nonblocking. Connect returns after the SYN is sent, and does
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* not wait for ACK+SYN.
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*/
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int tcp_fconnect(struct socket *so)
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{
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Slirp *slirp = so->slirp;
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int ret=0;
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DEBUG_CALL("tcp_fconnect");
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DEBUG_ARG("so = %lx", (long )so);
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if( (ret = so->s = qemu_socket(AF_INET,SOCK_STREAM,0)) >= 0) {
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int opt, s=so->s;
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struct sockaddr_in addr;
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socket_set_nonblock(s);
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opt = 1;
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setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(opt ));
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opt = 1;
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setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
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addr.sin_family = AF_INET;
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if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
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slirp->vnetwork_addr.s_addr) {
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/* It's an alias */
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if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
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if (get_dns_addr(&addr.sin_addr) < 0)
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addr.sin_addr = loopback_addr;
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} else {
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addr.sin_addr = loopback_addr;
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}
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} else
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addr.sin_addr = so->so_faddr;
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addr.sin_port = so->so_fport;
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DEBUG_MISC((dfd, " connect()ing, addr.sin_port=%d, "
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"addr.sin_addr.s_addr=%.16s\n",
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ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
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/* We don't care what port we get */
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ret = connect(s,(struct sockaddr *)&addr,sizeof (addr));
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/*
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* If it's not in progress, it failed, so we just return 0,
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* without clearing SS_NOFDREF
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*/
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soisfconnecting(so);
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}
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return(ret);
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}
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/*
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* Accept the socket and connect to the local-host
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*
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* We have a problem. The correct thing to do would be
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* to first connect to the local-host, and only if the
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* connection is accepted, then do an accept() here.
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* But, a) we need to know who's trying to connect
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* to the socket to be able to SYN the local-host, and
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* b) we are already connected to the foreign host by
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* the time it gets to accept(), so... We simply accept
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* here and SYN the local-host.
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*/
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void tcp_connect(struct socket *inso)
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{
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Slirp *slirp = inso->slirp;
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struct socket *so;
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struct sockaddr_in addr;
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socklen_t addrlen = sizeof(struct sockaddr_in);
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struct tcpcb *tp;
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int s, opt;
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DEBUG_CALL("tcp_connect");
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DEBUG_ARG("inso = %lx", (long)inso);
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/*
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* If it's an SS_ACCEPTONCE socket, no need to socreate()
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* another socket, just use the accept() socket.
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*/
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if (inso->so_state & SS_FACCEPTONCE) {
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/* FACCEPTONCE already have a tcpcb */
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so = inso;
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} else {
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so = socreate(slirp);
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if (so == NULL) {
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/* If it failed, get rid of the pending connection */
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closesocket(accept(inso->s, (struct sockaddr *)&addr, &addrlen));
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return;
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}
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if (tcp_attach(so) < 0) {
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free(so); /* NOT sofree */
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return;
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}
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so->so_laddr = inso->so_laddr;
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so->so_lport = inso->so_lport;
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}
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tcp_mss(sototcpcb(so), 0);
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s = accept(inso->s, (struct sockaddr *)&addr, &addrlen);
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if (s < 0) {
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tcp_close(sototcpcb(so)); /* This will sofree() as well */
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return;
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}
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socket_set_nonblock(s);
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opt = 1;
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(int));
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opt = 1;
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setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char *)&opt, sizeof(int));
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socket_set_nodelay(s);
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so->so_fport = addr.sin_port;
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so->so_faddr = addr.sin_addr;
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/* Translate connections from localhost to the real hostname */
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if (so->so_faddr.s_addr == 0 ||
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(so->so_faddr.s_addr & loopback_mask) ==
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(loopback_addr.s_addr & loopback_mask)) {
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so->so_faddr = slirp->vhost_addr;
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}
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/* Close the accept() socket, set right state */
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if (inso->so_state & SS_FACCEPTONCE) {
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/* If we only accept once, close the accept() socket */
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closesocket(so->s);
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/* Don't select it yet, even though we have an FD */
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/* if it's not FACCEPTONCE, it's already NOFDREF */
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so->so_state = SS_NOFDREF;
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}
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so->s = s;
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so->so_state |= SS_INCOMING;
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so->so_iptos = tcp_tos(so);
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tp = sototcpcb(so);
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tcp_template(tp);
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tp->t_state = TCPS_SYN_SENT;
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tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
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tp->iss = slirp->tcp_iss;
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slirp->tcp_iss += TCP_ISSINCR/2;
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tcp_sendseqinit(tp);
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tcp_output(tp);
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}
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|
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/*
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* Attach a TCPCB to a socket.
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|
*/
|
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int
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tcp_attach(struct socket *so)
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{
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if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
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return -1;
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insque(so, &so->slirp->tcb);
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return 0;
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}
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|
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/*
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|
* Set the socket's type of service field
|
|
*/
|
|
static const 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}
|
|
};
|
|
|
|
static struct emu_t *tcpemu = NULL;
|
|
|
|
/*
|
|
* Return TOS according to the above table
|
|
*/
|
|
uint8_t
|
|
tcp_tos(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++;
|
|
}
|
|
|
|
/* Nope, lets see if there's a user-added one */
|
|
for (emup = tcpemu; emup; emup = emup->next) {
|
|
if ((emup->fport && (ntohs(so->so_fport) == emup->fport)) ||
|
|
(emup->lport && (ntohs(so->so_lport) == emup->lport))) {
|
|
so->so_emu = emup->emu;
|
|
return emup->tos;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
* sbappend()ed
|
|
*
|
|
* NOTE: if you return 0 you MUST m_free() the mbuf!
|
|
*/
|
|
int
|
|
tcp_emu(struct socket *so, struct mbuf *m)
|
|
{
|
|
Slirp *slirp = so->slirp;
|
|
u_int n1, n2, n3, n4, n5, n6;
|
|
char buff[257];
|
|
uint32_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;
|
|
socklen_t addrlen = sizeof(struct sockaddr_in);
|
|
struct 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, "%u%*[ ,]%u", &n1, &n2) == 2) {
|
|
HTONS(n1);
|
|
HTONS(n2);
|
|
/* n2 is the one on our host */
|
|
for (tmpso = slirp->tcb.so_next;
|
|
tmpso != &slirp->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 = snprintf(so_rcv->sb_data,
|
|
so_rcv->sb_datalen,
|
|
"%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;
|
|
}
|
|
m_free(m);
|
|
return 0;
|
|
}
|
|
|
|
case EMU_FTP: /* ftp */
|
|
*(m->m_data+m->m_len) = 0; /* NUL terminate for strstr */
|
|
if ((bptr = (char *)strstr(m->m_data, "ORT")) != NULL) {
|
|
/*
|
|
* Need to emulate the PORT command
|
|
*/
|
|
x = sscanf(bptr, "ORT %u,%u,%u,%u,%u,%u\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 = tcp_listen(slirp, INADDR_ANY, 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 += snprintf(bptr, m->m_hdr.mh_size - m->m_len,
|
|
"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 (%u,%u,%u,%u,%u,%u)\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 = tcp_listen(slirp, INADDR_ANY, 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 += snprintf(bptr, m->m_hdr.mh_size - m->m_len,
|
|
"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 = tcp_listen(slirp, INADDR_ANY, 0, so->so_laddr.s_addr,
|
|
htons(lport), SS_FACCEPTONCE)) != NULL)
|
|
m->m_len = snprintf(m->m_data, m->m_hdr.mh_size, "%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 = tcp_listen(slirp, INADDR_ANY, 0,
|
|
htonl(laddr), htons(lport),
|
|
SS_FACCEPTONCE)) == NULL) {
|
|
return 1;
|
|
}
|
|
m->m_len = bptr - m->m_data; /* Adjust length */
|
|
m->m_len += snprintf(bptr, m->m_hdr.mh_size,
|
|
"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 = tcp_listen(slirp, INADDR_ANY, 0,
|
|
htonl(laddr), htons(lport),
|
|
SS_FACCEPTONCE)) == NULL) {
|
|
return 1;
|
|
}
|
|
m->m_len = bptr - m->m_data; /* Adjust length */
|
|
m->m_len += snprintf(bptr, m->m_hdr.mh_size,
|
|
"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 = tcp_listen(slirp, INADDR_ANY, 0,
|
|
htonl(laddr), htons(lport),
|
|
SS_FACCEPTONCE)) == NULL) {
|
|
return 1;
|
|
}
|
|
m->m_len = bptr - m->m_data; /* Adjust length */
|
|
m->m_len += snprintf(bptr, m->m_hdr.mh_size,
|
|
"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(slirp, INADDR_ANY,
|
|
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(struct socket *so)
|
|
{
|
|
Slirp *slirp = so->slirp;
|
|
struct sbuf *sb = &so->so_snd;
|
|
struct ex_list *ex_ptr;
|
|
int do_pty;
|
|
|
|
DEBUG_CALL("tcp_ctl");
|
|
DEBUG_ARG("so = %lx", (long )so);
|
|
|
|
if (so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
|
|
/* Check if it's pty_exec */
|
|
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
|
if (ex_ptr->ex_fport == so->so_fport &&
|
|
so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr) {
|
|
if (ex_ptr->ex_pty == 3) {
|
|
so->s = -1;
|
|
so->extra = (void *)ex_ptr->ex_exec;
|
|
return 1;
|
|
}
|
|
do_pty = ex_ptr->ex_pty;
|
|
DEBUG_MISC((dfd, " executing %s\n", ex_ptr->ex_exec));
|
|
return fork_exec(so, ex_ptr->ex_exec, do_pty);
|
|
}
|
|
}
|
|
}
|
|
sb->sb_cc =
|
|
snprintf(sb->sb_wptr, sb->sb_datalen - (sb->sb_wptr - sb->sb_data),
|
|
"Error: No application configured.\r\n");
|
|
sb->sb_wptr += sb->sb_cc;
|
|
return 0;
|
|
}
|