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Diffstat (limited to 'slirp-android/tcp_subr.c')
| -rw-r--r-- | slirp-android/tcp_subr.c | 1041 |
1 files changed, 1041 insertions, 0 deletions
diff --git a/slirp-android/tcp_subr.c b/slirp-android/tcp_subr.c new file mode 100644 index 0000000..b8b680c --- /dev/null +++ b/slirp-android/tcp_subr.c @@ -0,0 +1,1041 @@ +/* + * 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. + */ + +#define WANT_SYS_IOCTL_H +#include <slirp.h> +#include "proxy_common.h" + +/* patchable/settable parameters for tcp */ +/* Don't do rfc1323 performance enhancements */ +#define TCP_DO_RFC1323 0 + +/* + * Tcp initialization + */ +void +tcp_init(void) +{ + tcp_iss = 1; /* wrong */ + tcb.so_next = tcb.so_prev = &tcb; +} + +/* + * Create template to be used to send tcp packets on a connection. + * Call after host entry created, fills + * in a skeletal tcp/ip header, minimizing the amount of work + * necessary when the connection is used. + */ +/* struct tcpiphdr * */ +void +tcp_template(struct tcpcb *tp) +{ + struct socket *so = tp->t_socket; + register struct tcpiphdr *n = &tp->t_template; + + n->ti_mbuf = NULL; + n->ti_x1 = 0; + n->ti_pr = IPPROTO_TCP; + n->ti_len = htons(sizeof (struct tcpiphdr) - sizeof (struct ip)); + n->ti_src = ip_seth(so->so_faddr_ip); + n->ti_dst = ip_seth(so->so_laddr_ip); + n->ti_sport = port_seth(so->so_faddr_port); + n->ti_dport = port_seth(so->so_laddr_port); + + 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) +{ + register int tlen; + int win = 0; + + DEBUG_CALL("tcp_respond"); + DEBUG_ARG("tp = %lx", (long)tp); + DEBUG_ARG("ti = %lx", (long)ti); + DEBUG_ARG("m = %lx", (long)m); + DEBUG_ARG("ack = %u", ack); + DEBUG_ARG("seq = %u", seq); + DEBUG_ARG("flags = %x", flags); + + if (tp) + win = sbspace(&tp->t_socket->so_rcv); + if (m == NULL) { + if ((m = m_get()) == NULL) + return; +#ifdef TCP_COMPAT_42 + tlen = 1; +#else + tlen = 0; +#endif + m->m_data += IF_MAXLINKHDR; + *mtod(m, struct tcpiphdr *) = *ti; + ti = mtod(m, struct tcpiphdr *); + flags = TH_ACK; + } else { + /* + * ti points into m so the next line is just making + * the mbuf point to ti + */ + m->m_data = (caddr_t)ti; + + m->m_len = sizeof (struct tcpiphdr); + tlen = 0; +#define xchg(a,b,type) { type t; t=a; a=b; b=t; } + xchg(ti->ti_dst, ti->ti_src, ipaddr_t); + xchg(ti->ti_dport, ti->ti_sport, port_t); +#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_x1 = 0; + ti->ti_seq = htonl(seq); + ti->ti_ack = htonl(ack); + ti->ti_x2 = 0; + ti->ti_off = sizeof (struct tcphdr) >> 2; + ti->ti_flags = flags; + if (tp) + ti->ti_win = htons((u_int16_t) (win >> tp->rcv_scale)); + else + ti->ti_win = htons((u_int16_t)win); + ti->ti_urp = 0; + ti->ti_sum = 0; + ti->ti_sum = cksum(m, tlen); + ((struct ip *)ti)->ip_len = tlen; + + if(flags & TH_RST) + ((struct ip *)ti)->ip_ttl = MAXTTL; + else + ((struct ip *)ti)->ip_ttl = IPDEFTTL; + + (void) ip_output((struct socket *)0, m); +} + +/* + * Create a new TCP control block, making an + * empty reassembly queue and hooking it to the argument + * protocol control block. + */ +struct tcpcb * +tcp_newtcpcb(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 = TCP_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) +{ +/* tcp_drop(tp, errno) + register struct tcpcb *tp; + int errno; +{ +*/ + + DEBUG_CALL("tcp_drop"); + DEBUG_ARG("tp = %lx", (long)tp); + DEBUG_ARG("errno = %d", errno); + + if (TCPS_HAVERCVDSYN(tp->t_state)) { + tp->t_state = TCPS_CLOSED; + (void) tcp_output(tp); + STAT(tcpstat.tcps_drops++); + } else + STAT(tcpstat.tcps_conndrops++); +/* if (errno == ETIMEDOUT && tp->t_softerror) + * errno = tp->t_softerror; + */ +/* so->so_error = errno; */ + return (tcp_close(tp)); +} + +/* + * Close a TCP control block: + * discard all space held by the tcp + * discard internet protocol block + * wake up any sleepers + */ +struct tcpcb * +tcp_close(struct tcpcb *tp) +{ + register struct tcpiphdr *t; + struct socket *so = tp->t_socket; + register struct mbuf *m; + + DEBUG_CALL("tcp_close"); + DEBUG_ARG("tp = %lx", (long )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_freem(m); + } + /* It's static */ +/* if (tp->t_template) + * (void) m_free(dtom(tp->t_template)); + */ +/* free(tp, M_PCB); */ + free(tp); + so->so_tcpcb = NULL; + soisfdisconnected(so); + /* clobber input socket cache if we're closing the cached connection */ + if (so == tcp_last_so) + tcp_last_so = &tcb; + socket_close(so->s); + sbfree(&so->so_rcv); + sbfree(&so->so_snd); + sofree(so); + STAT(tcpstat.tcps_closed++); + return ((struct tcpcb *)0); +} + +#ifdef notdef +void +tcp_drain() +{ + /* XXX */ +} + +/* + * When a source quench is received, close congestion window + * to one segment. We will gradually open it again as we proceed. + */ +void +tcp_quench(i, errno) + + int errno; +{ + struct tcpcb *tp = intotcpcb(inp); + + if (tp) + tp->snd_cwnd = tp->t_maxseg; +} + +#endif /* notdef */ + +/* + * TCP protocol interface to socket abstraction. + */ + +/* + * User issued close, and wish to trail through shutdown states: + * if never received SYN, just forget it. If got a SYN from peer, + * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN. + * If already got a FIN from peer, then almost done; go to LAST_ACK + * state. In all other cases, have already sent FIN to peer (e.g. + * after PRU_SHUTDOWN), and just have to play tedious game waiting + * for peer to send FIN or not respond to keep-alives, etc. + * We can let the user exit from the close as soon as the FIN is acked. + */ +void +tcp_sockclosed(struct tcpcb *tp) +{ + + DEBUG_CALL("tcp_sockclosed"); + DEBUG_ARG("tp = %lx", (long)tp); + + switch (tp->t_state) { + + case TCPS_CLOSED: + case TCPS_LISTEN: + case TCPS_SYN_SENT: + tp->t_state = TCPS_CLOSED; + tp = tcp_close(tp); + break; + + case TCPS_SYN_RECEIVED: + case TCPS_ESTABLISHED: + tp->t_state = TCPS_FIN_WAIT_1; + break; + + case TCPS_CLOSE_WAIT: + tp->t_state = TCPS_LAST_ACK; + break; + } +/* soisfdisconnecting(tp->t_socket); */ + if (tp && tp->t_state >= TCPS_FIN_WAIT_2) + soisfdisconnected(tp->t_socket); + if (tp) + tcp_output(tp); +} + +static void +tcp_proxy_event( struct socket* so, + int s, + ProxyEvent event ) +{ + so->so_state &= ~SS_PROXIFIED; + + if (event == PROXY_EVENT_CONNECTED) { + so->s = s; + so->so_state &= ~(SS_ISFCONNECTING); + } + else { + so->so_state = SS_NOFDREF; + } + + /* continue the connect */ + tcp_input(NULL, sizeof(struct ip), so); +} + +/* + * Connect to a host on the Internet + * Called by tcp_input + * Only do a connect, the tcp fields will be set in tcp_input + * return 0 if there's a result of the connect, + * else return -1 means we're still connecting + * The return value is almost always -1 since the socket is + * nonblocking. Connect returns after the SYN is sent, and does + * not wait for ACK+SYN. + */ +int tcp_fconnect(struct socket *so) +{ + int ret=0; + int try_proxy = 1; + SockAddress sockaddr; + uint32_t sock_ip; + uint16_t sock_port; + + DEBUG_CALL("tcp_fconnect"); + DEBUG_ARG("so = %lx", (long )so); + + sock_ip = so->so_faddr_ip; + sock_port = so->so_faddr_port; + + if ((sock_ip & 0xffffff00) == special_addr_ip) { + /* It's an alias */ + int last_byte = sock_ip & 0xff; + + if (CTL_IS_DNS(last_byte)) + sock_ip = dns_addr[last_byte - CTL_DNS]; + else + sock_ip = loopback_addr_ip; + try_proxy = 0; + } + + sock_address_init_inet( &sockaddr, sock_ip, sock_port ); + + DEBUG_MISC((dfd, " connect()ing, addr=%s, proxy=%d\n", + sock_address_to_string(&sockaddr), try_proxy)); + + if (try_proxy) { + if (!proxy_manager_add(&sockaddr, SOCKET_STREAM, (ProxyEventFunc) tcp_proxy_event, so)) { + soisfconnecting(so); + so->s = -1; + so->so_state |= SS_PROXIFIED; + return 0; + } + } + + if ((ret=so->s=socket_create_inet(SOCKET_STREAM)) >= 0) + { + int s = so->s; + + socket_set_nonblock(s); + socket_set_xreuseaddr(s); + socket_set_oobinline(s); + + /* We don't care what port we get */ + socket_connect(s, &sockaddr); + + /* + * 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) +{ + struct socket *so; + SockAddress addr; + uint32_t addr_ip; + struct tcpcb *tp; + int s; + + DEBUG_CALL("tcp_connect"); + DEBUG_ARG("inso = %lx", (long)inso); + + /* + * If it's an SS_ACCEPTONCE socket, no need to socreate() + * another socket, just use the accept() socket. + */ + if (inso->so_state & SS_FACCEPTONCE) { + /* FACCEPTONCE already have a tcpcb */ + so = inso; + } else { + if ((so = socreate()) == NULL) { + /* If it failed, get rid of the pending connection */ + socket_close(socket_accept(inso->s, NULL)); + return; + } + if (tcp_attach(so) < 0) { + free(so); /* NOT sofree */ + return; + } + so->so_laddr_ip = inso->so_laddr_ip; + so->so_laddr_port = inso->so_laddr_port; + } + + (void) tcp_mss(sototcpcb(so), 0); + + if ((s = socket_accept(inso->s, &addr)) < 0) { + tcp_close(sototcpcb(so)); /* This will sofree() as well */ + return; + } + socket_set_nonblock(s); + socket_set_xreuseaddr(s); + socket_set_oobinline(s); + socket_set_nodelay(s); + + so->so_faddr_port = sock_address_get_port(&addr); + + addr_ip = sock_address_get_ip(&addr); + + so->so_faddr_ip = addr_ip; + /* Translate connections from localhost to the real hostname */ + if (addr_ip == 0 || addr_ip == loopback_addr_ip) + so->so_faddr_ip = alias_addr_ip; + + /* Close the accept() socket, set right state */ + if (inso->so_state & SS_FACCEPTONCE) { + socket_close(so->s); /* If we only accept once, close the accept() socket */ + so->so_state = SS_NOFDREF; /* Don't select it yet, even though we have an FD */ + /* if it's not FACCEPTONCE, it's already NOFDREF */ + } + so->s = s; + + so->so_iptos = tcp_tos(so); + tp = sototcpcb(so); + + tcp_template(tp); + + /* Compute window scaling to request. */ +/* while (tp->request_r_scale < TCP_MAX_WINSHIFT && + * (TCP_MAXWIN << tp->request_r_scale) < so->so_rcv.sb_hiwat) + * tp->request_r_scale++; + */ + +/* soisconnecting(so); */ /* NOFDREF used instead */ + STAT(tcpstat.tcps_connattempt++); + + tp->t_state = TCPS_SYN_SENT; + tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT; + tp->iss = tcp_iss; + tcp_iss += TCP_ISSINCR/2; + tcp_sendseqinit(tp); + tcp_output(tp); +} + +/* + * Attach a TCPCB to a socket. + */ +int +tcp_attach(struct socket *so) +{ + if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) + return -1; + + insque(so, &tcb); + + return 0; +} + +/* + * Set the socket's type of service field + */ +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} +}; + +#ifdef CONFIG_QEMU +static +#endif +struct emu_t *tcpemu = NULL; + +/* + * Return TOS according to the above table + */ +u_int8_t +tcp_tos(struct socket *so) +{ + int i = 0; + struct emu_t *emup; + + while(tcptos[i].tos) { + if ((tcptos[i].fport && so->so_faddr_port == tcptos[i].fport) || + (tcptos[i].lport && so->so_laddr_port == 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 && (so->so_faddr_port == emup->fport)) || + (emup->lport && (so->so_laddr_port == emup->lport))) { + so->so_emu = emup->emu; + return emup->tos; + } + } + return 0; +} + +#if 0 +int do_echo = -1; +#endif + +/* + * 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) +{ + u_int n1, n2, n3, n4, n5, n6; + char buff[257]; + u_int32_t laddr; + u_int lport; + char *bptr; + + DEBUG_CALL("tcp_emu"); + DEBUG_ARG("so = %lx", (long)so); + DEBUG_ARG("m = %lx", (long)m); + + switch(so->so_emu) { + int x, i; + + case EMU_IDENT: + /* + * Identification protocol as per rfc-1413 + */ + + { + struct socket *tmpso; + SockAddress addr; + 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) { + /* n2 is the one on our host */ + for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) { + if (tmpso->so_laddr_ip == so->so_laddr_ip && + tmpso->so_laddr_port == n2 && + tmpso->so_faddr_ip == so->so_faddr_ip && + tmpso->so_faddr_port == n1) { + if (socket_get_address(tmpso->s, &addr) == 0) + n2 = sock_address_get_port(&addr); + 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 = (n1 << 24) | (n2 << 16) | (n3 << 8) | (n4); + lport = (n5 << 8) | (n6); + + if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL) + return 1; + + n6 = so->so_faddr_port; + + n5 = (n6 >> 8) & 0xff; + n6 &= 0xff; + + laddr = so->so_faddr_ip; + + 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 = (n1 << 24) | (n2 << 16) | (n3 << 8) | (n4); + lport = (n5 << 8) | (n6); + + if ((so = solisten(0, laddr, lport, SS_FACCEPTONCE)) == NULL) + return 1; + + n6 = so->so_faddr_port; + + n5 = (n6 >> 8) & 0xff; + n6 &= 0xff; + + laddr = so->so_faddr_ip; + + 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 = solisten(0, so->so_laddr_ip, lport, SS_FACCEPTONCE)) != NULL) + m->m_len = snprintf(m->m_data, m->m_hdr.mh_size, "%d", + so->so_faddr_port) + 1; + return 1; + + case EMU_IRC: + /* + * Need to emulate DCC CHAT, DCC SEND and DCC MOVE + */ + *(m->m_data+m->m_len) = 0; /* NULL terminate the string for strstr */ + if ((bptr = (char *)strstr(m->m_data, "DCC")) == NULL) + return 1; + + /* The %256s is for the broken mIRC */ + if (sscanf(bptr, "DCC CHAT %256s %u %u", buff, &laddr, &lport) == 3) { + if ((so = solisten(0, laddr, 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) so->so_faddr_ip, + so->so_faddr_port, 1); + } else if (sscanf(bptr, "DCC SEND %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) { + if ((so = solisten(0, laddr, 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 %u %u %u%c\n", buff, + so->so_faddr_ip, so->so_faddr_port, n1, 1); + } else if (sscanf(bptr, "DCC MOVE %256s %u %u %u", buff, &laddr, &lport, &n1) == 4) { + if ((so = solisten(0, laddr, 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)so->so_faddr_ip, + so->so_faddr_port, 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 .....×..gælÜc..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...........Á. + * 0010:00 67 75 78 F5 63 00 0A 57 69 6E 32 2E 30 2E 30 .guxõc..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( p, + so->so_laddr_ip, + 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) +{ + struct sbuf *sb = &so->so_snd; + int command; + struct ex_list *ex_ptr; + int do_pty; + // struct socket *tmpso; + + DEBUG_CALL("tcp_ctl"); + DEBUG_ARG("so = %lx", (long )so); + +#if 0 + /* + * Check if they're authorised + */ + if (ctl_addr_ip && (ctl_addr_ip == -1 || (so->so_laddr_ip != ctl_addr_ip))) { + sb->sb_cc = sprintf(sb->sb_wptr,"Error: Permission denied.\r\n"); + sb->sb_wptr += sb->sb_cc; + return 0; + } +#endif + command = (so->so_faddr_ip & 0xff); + + switch(command) { + default: /* Check for exec's */ + + /* + * Check if it's pty_exec + */ + for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { + if (ex_ptr->ex_fport == so->so_faddr_port && + command == ex_ptr->ex_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; + goto do_exec; + } + } + + /* + * Nothing bound.. + */ + /* tcp_fconnect(so); */ + + /* FALLTHROUGH */ + case CTL_ALIAS: + 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); + + do_exec: + DEBUG_MISC((dfd, " executing %s \n",ex_ptr->ex_exec)); + return(fork_exec(so, ex_ptr->ex_exec, do_pty)); + +#if 0 + case CTL_CMD: + for (tmpso = tcb.so_next; tmpso != &tcb; tmpso = tmpso->so_next) { + if (tmpso->so_emu == EMU_CTL && + !(tmpso->so_tcpcb? + (tmpso->so_tcpcb->t_state & (TCPS_TIME_WAIT|TCPS_LAST_ACK)) + :0)) { + /* Ooops, control connection already active */ + sb->sb_cc = sprintf(sb->sb_wptr,"Sorry, already connected.\r\n"); + sb->sb_wptr += sb->sb_cc; + return 0; + } + } + so->so_emu = EMU_CTL; + ctl_password_ok = 0; + sb->sb_cc = sprintf(sb->sb_wptr, "Slirp command-line ready (type \"help\" for help).\r\nSlirp> "); + sb->sb_wptr += sb->sb_cc; + do_echo=-1; + return(2); +#endif + } +} |