mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-05 10:16:50 +00:00
2e30230aa9
When forwarding TCP packets, the internal tcpiphdr struct length was wrongly used inside the IP header. This commit changes the behaviour to what is used by tcp_output.c, using the correct full IP header + payload length. Signed-off-by: Sjors Gielen <sjors@sjorsgielen.nl> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
975 lines
27 KiB
C
975 lines
27 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1988, 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)tcp_subr.c 8.1 (Berkeley) 6/10/93
|
|
* tcp_subr.c,v 1.5 1994/10/08 22:39:58 phk Exp
|
|
*/
|
|
|
|
/*
|
|
* Changes and additions relating to SLiRP
|
|
* Copyright (c) 1995 Danny Gasparovski.
|
|
*
|
|
* Please read the file COPYRIGHT for the
|
|
* terms and conditions of the copyright.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "slirp.h"
|
|
|
|
/* patchable/settable parameters for tcp */
|
|
/* Don't do rfc1323 performance enhancements */
|
|
#define TCP_DO_RFC1323 0
|
|
|
|
/*
|
|
* Tcp initialization
|
|
*/
|
|
void
|
|
tcp_init(Slirp *slirp)
|
|
{
|
|
slirp->tcp_iss = 1; /* wrong */
|
|
slirp->tcb.so_next = slirp->tcb.so_prev = &slirp->tcb;
|
|
slirp->tcp_last_so = &slirp->tcb;
|
|
}
|
|
|
|
void tcp_cleanup(Slirp *slirp)
|
|
{
|
|
while (slirp->tcb.so_next != &slirp->tcb) {
|
|
tcp_close(sototcpcb(slirp->tcb.so_next));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create template to be used to send tcp packets on a connection.
|
|
* Call after host entry created, fills
|
|
* in a skeletal tcp/ip header, minimizing the amount of work
|
|
* necessary when the connection is used.
|
|
*/
|
|
void
|
|
tcp_template(struct tcpcb *tp)
|
|
{
|
|
struct socket *so = tp->t_socket;
|
|
register struct tcpiphdr *n = &tp->t_template;
|
|
|
|
n->ti_mbuf = NULL;
|
|
memset(&n->ti, 0, sizeof(n->ti));
|
|
n->ti_x0 = 0;
|
|
switch (so->so_ffamily) {
|
|
case AF_INET:
|
|
n->ti_pr = IPPROTO_TCP;
|
|
n->ti_len = htons(sizeof(struct tcphdr));
|
|
n->ti_src = so->so_faddr;
|
|
n->ti_dst = so->so_laddr;
|
|
n->ti_sport = so->so_fport;
|
|
n->ti_dport = so->so_lport;
|
|
break;
|
|
|
|
case AF_INET6:
|
|
n->ti_nh6 = IPPROTO_TCP;
|
|
n->ti_len = htons(sizeof(struct tcphdr));
|
|
n->ti_src6 = so->so_faddr6;
|
|
n->ti_dst6 = so->so_laddr6;
|
|
n->ti_sport = so->so_fport6;
|
|
n->ti_dport = so->so_lport6;
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
n->ti_seq = 0;
|
|
n->ti_ack = 0;
|
|
n->ti_x2 = 0;
|
|
n->ti_off = 5;
|
|
n->ti_flags = 0;
|
|
n->ti_win = 0;
|
|
n->ti_sum = 0;
|
|
n->ti_urp = 0;
|
|
}
|
|
|
|
/*
|
|
* Send a single message to the TCP at address specified by
|
|
* the given TCP/IP header. If m == 0, then we make a copy
|
|
* of the tcpiphdr at ti and send directly to the addressed host.
|
|
* This is used to force keep alive messages out using the TCP
|
|
* template for a connection tp->t_template. If flags are given
|
|
* then we send a message back to the TCP which originated the
|
|
* segment ti, and discard the mbuf containing it and any other
|
|
* attached mbufs.
|
|
*
|
|
* In any case the ack and sequence number of the transmitted
|
|
* segment are as specified by the parameters.
|
|
*/
|
|
void
|
|
tcp_respond(struct tcpcb *tp, struct tcpiphdr *ti, struct mbuf *m,
|
|
tcp_seq ack, tcp_seq seq, int flags, unsigned short af)
|
|
{
|
|
register int tlen;
|
|
int win = 0;
|
|
|
|
DEBUG_CALL("tcp_respond");
|
|
DEBUG_ARG("tp = %p", tp);
|
|
DEBUG_ARG("ti = %p", ti);
|
|
DEBUG_ARG("m = %p", m);
|
|
DEBUG_ARG("ack = %u", ack);
|
|
DEBUG_ARG("seq = %u", seq);
|
|
DEBUG_ARG("flags = %x", flags);
|
|
|
|
if (tp)
|
|
win = sbspace(&tp->t_socket->so_rcv);
|
|
if (m == NULL) {
|
|
if (!tp || (m = m_get(tp->t_socket->slirp)) == NULL)
|
|
return;
|
|
tlen = 0;
|
|
m->m_data += IF_MAXLINKHDR;
|
|
*mtod(m, struct tcpiphdr *) = *ti;
|
|
ti = mtod(m, struct tcpiphdr *);
|
|
memset(&ti->ti, 0, sizeof(ti->ti));
|
|
flags = TH_ACK;
|
|
} else {
|
|
/*
|
|
* ti points into m so the next line is just making
|
|
* the mbuf point to ti
|
|
*/
|
|
m->m_data = (caddr_t)ti;
|
|
|
|
m->m_len = sizeof (struct tcpiphdr);
|
|
tlen = 0;
|
|
#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
|
|
switch (af) {
|
|
case AF_INET:
|
|
xchg(ti->ti_dst.s_addr, ti->ti_src.s_addr, uint32_t);
|
|
xchg(ti->ti_dport, ti->ti_sport, uint16_t);
|
|
break;
|
|
case AF_INET6:
|
|
xchg(ti->ti_dst6, ti->ti_src6, struct in6_addr);
|
|
xchg(ti->ti_dport, ti->ti_sport, uint16_t);
|
|
break;
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
#undef xchg
|
|
}
|
|
ti->ti_len = htons((u_short)(sizeof (struct tcphdr) + tlen));
|
|
tlen += sizeof (struct tcpiphdr);
|
|
m->m_len = tlen;
|
|
|
|
ti->ti_mbuf = NULL;
|
|
ti->ti_x0 = 0;
|
|
ti->ti_seq = htonl(seq);
|
|
ti->ti_ack = htonl(ack);
|
|
ti->ti_x2 = 0;
|
|
ti->ti_off = sizeof (struct tcphdr) >> 2;
|
|
ti->ti_flags = flags;
|
|
if (tp)
|
|
ti->ti_win = htons((uint16_t) (win >> tp->rcv_scale));
|
|
else
|
|
ti->ti_win = htons((uint16_t)win);
|
|
ti->ti_urp = 0;
|
|
ti->ti_sum = 0;
|
|
ti->ti_sum = cksum(m, tlen);
|
|
|
|
struct tcpiphdr tcpiph_save = *(mtod(m, struct tcpiphdr *));
|
|
struct ip *ip;
|
|
struct ip6 *ip6;
|
|
|
|
switch (af) {
|
|
case AF_INET:
|
|
m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
|
|
- sizeof(struct ip);
|
|
m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
|
|
- sizeof(struct ip);
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_len = m->m_len;
|
|
ip->ip_dst = tcpiph_save.ti_dst;
|
|
ip->ip_src = tcpiph_save.ti_src;
|
|
ip->ip_p = tcpiph_save.ti_pr;
|
|
|
|
if (flags & TH_RST) {
|
|
ip->ip_ttl = MAXTTL;
|
|
} else {
|
|
ip->ip_ttl = IPDEFTTL;
|
|
}
|
|
|
|
ip_output(NULL, m);
|
|
break;
|
|
|
|
case AF_INET6:
|
|
m->m_data += sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
|
|
- sizeof(struct ip6);
|
|
m->m_len -= sizeof(struct tcpiphdr) - sizeof(struct tcphdr)
|
|
- sizeof(struct ip6);
|
|
ip6 = mtod(m, struct ip6 *);
|
|
ip6->ip_pl = tcpiph_save.ti_len;
|
|
ip6->ip_dst = tcpiph_save.ti_dst6;
|
|
ip6->ip_src = tcpiph_save.ti_src6;
|
|
ip6->ip_nh = tcpiph_save.ti_nh6;
|
|
|
|
ip6_output(NULL, m, 0);
|
|
break;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create a new TCP control block, making an
|
|
* empty reassembly queue and hooking it to the argument
|
|
* protocol control block.
|
|
*/
|
|
struct tcpcb *
|
|
tcp_newtcpcb(struct socket *so)
|
|
{
|
|
register struct tcpcb *tp;
|
|
|
|
tp = (struct tcpcb *)malloc(sizeof(*tp));
|
|
if (tp == NULL)
|
|
return ((struct tcpcb *)0);
|
|
|
|
memset((char *) tp, 0, sizeof(struct tcpcb));
|
|
tp->seg_next = tp->seg_prev = (struct tcpiphdr*)tp;
|
|
tp->t_maxseg = (so->so_ffamily == AF_INET) ? TCP_MSS : TCP6_MSS;
|
|
|
|
tp->t_flags = TCP_DO_RFC1323 ? (TF_REQ_SCALE|TF_REQ_TSTMP) : 0;
|
|
tp->t_socket = so;
|
|
|
|
/*
|
|
* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
|
|
* rtt estimate. Set rttvar so that srtt + 2 * rttvar gives
|
|
* reasonable initial retransmit time.
|
|
*/
|
|
tp->t_srtt = TCPTV_SRTTBASE;
|
|
tp->t_rttvar = TCPTV_SRTTDFLT << 2;
|
|
tp->t_rttmin = TCPTV_MIN;
|
|
|
|
TCPT_RANGESET(tp->t_rxtcur,
|
|
((TCPTV_SRTTBASE >> 2) + (TCPTV_SRTTDFLT << 2)) >> 1,
|
|
TCPTV_MIN, TCPTV_REXMTMAX);
|
|
|
|
tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
|
|
tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
|
|
tp->t_state = TCPS_CLOSED;
|
|
|
|
so->so_tcpcb = tp;
|
|
|
|
return (tp);
|
|
}
|
|
|
|
/*
|
|
* Drop a TCP connection, reporting
|
|
* the specified error. If connection is synchronized,
|
|
* then send a RST to peer.
|
|
*/
|
|
struct tcpcb *tcp_drop(struct tcpcb *tp, int err)
|
|
{
|
|
DEBUG_CALL("tcp_drop");
|
|
DEBUG_ARG("tp = %p", tp);
|
|
DEBUG_ARG("errno = %d", errno);
|
|
|
|
if (TCPS_HAVERCVDSYN(tp->t_state)) {
|
|
tp->t_state = TCPS_CLOSED;
|
|
(void) tcp_output(tp);
|
|
}
|
|
return (tcp_close(tp));
|
|
}
|
|
|
|
/*
|
|
* Close a TCP control block:
|
|
* discard all space held by the tcp
|
|
* discard internet protocol block
|
|
* wake up any sleepers
|
|
*/
|
|
struct tcpcb *
|
|
tcp_close(struct tcpcb *tp)
|
|
{
|
|
register struct tcpiphdr *t;
|
|
struct socket *so = tp->t_socket;
|
|
Slirp *slirp = so->slirp;
|
|
register struct mbuf *m;
|
|
|
|
DEBUG_CALL("tcp_close");
|
|
DEBUG_ARG("tp = %p", tp);
|
|
|
|
/* free the reassembly queue, if any */
|
|
t = tcpfrag_list_first(tp);
|
|
while (!tcpfrag_list_end(t, tp)) {
|
|
t = tcpiphdr_next(t);
|
|
m = tcpiphdr_prev(t)->ti_mbuf;
|
|
remque(tcpiphdr2qlink(tcpiphdr_prev(t)));
|
|
m_free(m);
|
|
}
|
|
free(tp);
|
|
so->so_tcpcb = NULL;
|
|
/* clobber input socket cache if we're closing the cached connection */
|
|
if (so == slirp->tcp_last_so)
|
|
slirp->tcp_last_so = &slirp->tcb;
|
|
closesocket(so->s);
|
|
sbfree(&so->so_rcv);
|
|
sbfree(&so->so_snd);
|
|
sofree(so);
|
|
return ((struct tcpcb *)0);
|
|
}
|
|
|
|
/*
|
|
* TCP protocol interface to socket abstraction.
|
|
*/
|
|
|
|
/*
|
|
* User issued close, and wish to trail through shutdown states:
|
|
* if never received SYN, just forget it. If got a SYN from peer,
|
|
* but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
|
|
* If already got a FIN from peer, then almost done; go to LAST_ACK
|
|
* state. In all other cases, have already sent FIN to peer (e.g.
|
|
* after PRU_SHUTDOWN), and just have to play tedious game waiting
|
|
* for peer to send FIN or not respond to keep-alives, etc.
|
|
* We can let the user exit from the close as soon as the FIN is acked.
|
|
*/
|
|
void
|
|
tcp_sockclosed(struct tcpcb *tp)
|
|
{
|
|
|
|
DEBUG_CALL("tcp_sockclosed");
|
|
DEBUG_ARG("tp = %p", tp);
|
|
|
|
if (!tp) {
|
|
return;
|
|
}
|
|
|
|
switch (tp->t_state) {
|
|
|
|
case TCPS_CLOSED:
|
|
case TCPS_LISTEN:
|
|
case TCPS_SYN_SENT:
|
|
tp->t_state = TCPS_CLOSED;
|
|
tp = tcp_close(tp);
|
|
break;
|
|
|
|
case TCPS_SYN_RECEIVED:
|
|
case TCPS_ESTABLISHED:
|
|
tp->t_state = TCPS_FIN_WAIT_1;
|
|
break;
|
|
|
|
case TCPS_CLOSE_WAIT:
|
|
tp->t_state = TCPS_LAST_ACK;
|
|
break;
|
|
}
|
|
tcp_output(tp);
|
|
}
|
|
|
|
/*
|
|
* Connect to a host on the Internet
|
|
* Called by tcp_input
|
|
* Only do a connect, the tcp fields will be set in tcp_input
|
|
* return 0 if there's a result of the connect,
|
|
* else return -1 means we're still connecting
|
|
* The return value is almost always -1 since the socket is
|
|
* nonblocking. Connect returns after the SYN is sent, and does
|
|
* not wait for ACK+SYN.
|
|
*/
|
|
int tcp_fconnect(struct socket *so, unsigned short af)
|
|
{
|
|
int ret=0;
|
|
|
|
DEBUG_CALL("tcp_fconnect");
|
|
DEBUG_ARG("so = %p", so);
|
|
|
|
ret = so->s = qemu_socket(af, SOCK_STREAM, 0);
|
|
if (ret >= 0) {
|
|
int opt, s=so->s;
|
|
struct sockaddr_storage addr;
|
|
|
|
qemu_set_nonblock(s);
|
|
socket_set_fast_reuse(s);
|
|
opt = 1;
|
|
qemu_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(opt));
|
|
|
|
addr = so->fhost.ss;
|
|
DEBUG_CALL(" connect()ing")
|
|
sotranslate_out(so, &addr);
|
|
|
|
/* We don't care what port we get */
|
|
ret = connect(s, (struct sockaddr *)&addr, sockaddr_size(&addr));
|
|
|
|
/*
|
|
* If it's not in progress, it failed, so we just return 0,
|
|
* without clearing SS_NOFDREF
|
|
*/
|
|
soisfconnecting(so);
|
|
}
|
|
|
|
return(ret);
|
|
}
|
|
|
|
/*
|
|
* Accept the socket and connect to the local-host
|
|
*
|
|
* We have a problem. The correct thing to do would be
|
|
* to first connect to the local-host, and only if the
|
|
* connection is accepted, then do an accept() here.
|
|
* But, a) we need to know who's trying to connect
|
|
* to the socket to be able to SYN the local-host, and
|
|
* b) we are already connected to the foreign host by
|
|
* the time it gets to accept(), so... We simply accept
|
|
* here and SYN the local-host.
|
|
*/
|
|
void tcp_connect(struct socket *inso)
|
|
{
|
|
Slirp *slirp = inso->slirp;
|
|
struct socket *so;
|
|
struct sockaddr_storage addr;
|
|
socklen_t addrlen = sizeof(struct sockaddr_storage);
|
|
struct tcpcb *tp;
|
|
int s, opt;
|
|
|
|
DEBUG_CALL("tcp_connect");
|
|
DEBUG_ARG("inso = %p", inso);
|
|
|
|
/*
|
|
* If it's an SS_ACCEPTONCE socket, no need to socreate()
|
|
* another socket, just use the accept() socket.
|
|
*/
|
|
if (inso->so_state & SS_FACCEPTONCE) {
|
|
/* FACCEPTONCE already have a tcpcb */
|
|
so = inso;
|
|
} else {
|
|
so = socreate(slirp);
|
|
if (so == NULL) {
|
|
/* If it failed, get rid of the pending connection */
|
|
closesocket(accept(inso->s, (struct sockaddr *)&addr, &addrlen));
|
|
return;
|
|
}
|
|
if (tcp_attach(so) < 0) {
|
|
free(so); /* NOT sofree */
|
|
return;
|
|
}
|
|
so->lhost = inso->lhost;
|
|
so->so_ffamily = inso->so_ffamily;
|
|
}
|
|
|
|
tcp_mss(sototcpcb(so), 0);
|
|
|
|
s = accept(inso->s, (struct sockaddr *)&addr, &addrlen);
|
|
if (s < 0) {
|
|
tcp_close(sototcpcb(so)); /* This will sofree() as well */
|
|
return;
|
|
}
|
|
qemu_set_nonblock(s);
|
|
socket_set_fast_reuse(s);
|
|
opt = 1;
|
|
qemu_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &opt, sizeof(int));
|
|
socket_set_nodelay(s);
|
|
|
|
so->fhost.ss = addr;
|
|
sotranslate_accept(so);
|
|
|
|
/* Close the accept() socket, set right state */
|
|
if (inso->so_state & SS_FACCEPTONCE) {
|
|
/* If we only accept once, close the accept() socket */
|
|
closesocket(so->s);
|
|
|
|
/* Don't select it yet, even though we have an FD */
|
|
/* if it's not FACCEPTONCE, it's already NOFDREF */
|
|
so->so_state = SS_NOFDREF;
|
|
}
|
|
so->s = s;
|
|
so->so_state |= SS_INCOMING;
|
|
|
|
so->so_iptos = tcp_tos(so);
|
|
tp = sototcpcb(so);
|
|
|
|
tcp_template(tp);
|
|
|
|
tp->t_state = TCPS_SYN_SENT;
|
|
tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
|
|
tp->iss = slirp->tcp_iss;
|
|
slirp->tcp_iss += TCP_ISSINCR/2;
|
|
tcp_sendseqinit(tp);
|
|
tcp_output(tp);
|
|
}
|
|
|
|
/*
|
|
* Attach a TCPCB to a socket.
|
|
*/
|
|
int
|
|
tcp_attach(struct socket *so)
|
|
{
|
|
if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL)
|
|
return -1;
|
|
|
|
insque(so, &so->slirp->tcb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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 = %p", so);
|
|
DEBUG_ARG("m = %p", 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_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_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_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_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_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_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 = %p", 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;
|
|
}
|