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/*
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* Copyright (c) 1982, 1986, 1988, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
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* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 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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#include "ip_icmp.h" |
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#ifdef LOG_ENABLED
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struct udpstat udpstat;
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#endif
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|
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struct socket udb;
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|
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/*
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* UDP protocol implementation.
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* Per RFC 768, August, 1980.
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*/
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#ifndef COMPAT_42
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int udpcksum = 1; |
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#else
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int udpcksum = 0; /* XXX */ |
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#endif
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struct socket *udp_last_so = &udb;
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void
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udp_init() |
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{
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udb.so_next = udb.so_prev = &udb; |
| 70 |
} |
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/* m->m_data points at ip packet header
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* m->m_len length ip packet
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* ip->ip_len length data (IPDU)
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*/
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void
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udp_input(m, iphlen) |
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register struct mbuf *m; |
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int iphlen;
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{
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register struct ip *ip; |
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register struct udphdr *uh; |
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/* struct mbuf *opts = 0;*/
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int len;
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struct ip save_ip;
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struct socket *so;
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|
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DEBUG_CALL("udp_input");
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DEBUG_ARG("m = %lx", (long)m); |
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DEBUG_ARG("iphlen = %d", iphlen);
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STAT(udpstat.udps_ipackets++); |
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|
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/*
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* Strip IP options, if any; should skip this,
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* make available to user, and use on returned packets,
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* but we don't yet have a way to check the checksum
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* with options still present.
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*/
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if(iphlen > sizeof(struct ip)) { |
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ip_stripoptions(m, (struct mbuf *)0); |
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iphlen = sizeof(struct ip); |
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} |
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|
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/*
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* Get IP and UDP header together in first mbuf.
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*/
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ip = mtod(m, struct ip *);
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uh = (struct udphdr *)((caddr_t)ip + iphlen);
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/*
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* Make mbuf data length reflect UDP length.
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* If not enough data to reflect UDP length, drop.
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*/
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len = ntohs((u_int16_t)uh->uh_ulen); |
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if (ip->ip_len != len) {
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if (len > ip->ip_len) {
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STAT(udpstat.udps_badlen++); |
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goto bad;
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} |
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m_adj(m, len - ip->ip_len); |
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ip->ip_len = len; |
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} |
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|
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/*
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* Save a copy of the IP header in case we want restore it
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* for sending an ICMP error message in response.
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*/
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save_ip = *ip; |
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save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
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/*
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* Checksum extended UDP header and data.
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*/
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if (udpcksum && uh->uh_sum) {
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((struct ipovly *)ip)->ih_next = 0; |
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((struct ipovly *)ip)->ih_prev = 0; |
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((struct ipovly *)ip)->ih_x1 = 0; |
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((struct ipovly *)ip)->ih_len = uh->uh_ulen;
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/* keep uh_sum for ICMP reply
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* uh->uh_sum = cksum(m, len + sizeof (struct ip));
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* if (uh->uh_sum) {
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*/
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if(cksum(m, len + sizeof(struct ip))) { |
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STAT(udpstat.udps_badsum++); |
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goto bad;
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} |
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} |
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/*
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* handle DHCP/BOOTP
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*/
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if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
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bootp_input(m); |
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goto bad;
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} |
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/*
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* handle TFTP
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*/
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if (ntohs(uh->uh_dport) == TFTP_SERVER) {
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tftp_input(m); |
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goto bad;
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} |
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/*
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* Locate pcb for datagram.
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*/
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so = udp_last_so; |
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if (so->so_lport != uh->uh_sport ||
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so->so_laddr.s_addr != ip->ip_src.s_addr) {
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struct socket *tmp;
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for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
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if (tmp->so_lport == uh->uh_sport &&
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tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
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tmp->so_faddr.s_addr = ip->ip_dst.s_addr; |
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tmp->so_fport = uh->uh_dport; |
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so = tmp; |
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break;
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} |
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} |
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if (tmp == &udb) {
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so = NULL;
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} else {
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STAT(udpstat.udpps_pcbcachemiss++); |
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udp_last_so = so; |
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} |
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} |
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if (so == NULL) { |
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/*
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* If there's no socket for this packet,
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* create one
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*/
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if ((so = socreate()) == NULL) goto bad; |
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if(udp_attach(so) == -1) { |
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DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
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errno,strerror(errno))); |
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sofree(so); |
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goto bad;
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} |
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/*
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* Setup fields
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*/
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/* udp_last_so = so; */
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so->so_laddr = ip->ip_src; |
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so->so_lport = uh->uh_sport; |
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if ((so->so_iptos = udp_tos(so)) == 0) |
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so->so_iptos = ip->ip_tos; |
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/*
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* XXXXX Here, check if it's in udpexec_list,
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* and if it is, do the fork_exec() etc.
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*/
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} |
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so->so_faddr = ip->ip_dst; /* XXX */
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so->so_fport = uh->uh_dport; /* XXX */
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iphlen += sizeof(struct udphdr); |
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m->m_len -= iphlen; |
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m->m_data += iphlen; |
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/*
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* Now we sendto() the packet.
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*/
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if (so->so_emu)
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udp_emu(so, m); |
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if(sosendto(so,m) == -1) { |
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m->m_len += iphlen; |
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m->m_data -= iphlen; |
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*ip=save_ip; |
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DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
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icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
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} |
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m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
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/* restore the orig mbuf packet */
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m->m_len += iphlen; |
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m->m_data -= iphlen; |
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*ip=save_ip; |
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so->so_m=m; /* ICMP backup */
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return;
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bad:
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m_freem(m); |
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/* if (opts) m_freem(opts); */
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return;
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} |
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|
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int udp_output2(struct socket *so, struct mbuf *m, |
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struct sockaddr_in *saddr, struct sockaddr_in *daddr, |
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int iptos)
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{
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register struct udpiphdr *ui; |
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int error = 0; |
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|
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DEBUG_CALL("udp_output");
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DEBUG_ARG("so = %lx", (long)so); |
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DEBUG_ARG("m = %lx", (long)m); |
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DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr); |
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DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr); |
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|
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/*
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* Adjust for header
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*/
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m->m_data -= sizeof(struct udpiphdr); |
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m->m_len += sizeof(struct udpiphdr); |
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|
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/*
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* Fill in mbuf with extended UDP header
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* and addresses and length put into network format.
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*/
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ui = mtod(m, struct udpiphdr *);
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ui->ui_next = ui->ui_prev = 0;
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ui->ui_x1 = 0;
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ui->ui_pr = IPPROTO_UDP; |
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ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */ |
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/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
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ui->ui_src = saddr->sin_addr; |
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ui->ui_dst = daddr->sin_addr; |
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ui->ui_sport = saddr->sin_port; |
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ui->ui_dport = daddr->sin_port; |
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ui->ui_ulen = ui->ui_len; |
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|
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/*
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* Stuff checksum and output datagram.
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*/
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ui->ui_sum = 0;
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if (udpcksum) {
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if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0) |
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ui->ui_sum = 0xffff;
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} |
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((struct ip *)ui)->ip_len = m->m_len;
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|
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((struct ip *)ui)->ip_ttl = ip_defttl;
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((struct ip *)ui)->ip_tos = iptos;
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|
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STAT(udpstat.udps_opackets++); |
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|
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error = ip_output(so, m); |
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|
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return (error);
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} |
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|
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int udp_output(struct socket *so, struct mbuf *m, |
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struct sockaddr_in *addr)
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|
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{
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struct sockaddr_in saddr, daddr;
|
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|
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saddr = *addr; |
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if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) { |
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saddr.sin_addr.s_addr = so->so_faddr.s_addr; |
| 320 |
if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff)) |
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saddr.sin_addr.s_addr = alias_addr.s_addr; |
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} |
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daddr.sin_addr = so->so_laddr; |
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daddr.sin_port = so->so_lport; |
| 325 |
|
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return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
|
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} |
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|
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int
|
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udp_attach(so) |
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struct socket *so;
|
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{
|
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struct sockaddr_in addr;
|
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|
| 335 |
if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) { |
| 336 |
/*
|
| 337 |
* Here, we bind() the socket. Although not really needed
|
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* (sendto() on an unbound socket will bind it), it's done
|
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* here so that emulation of ytalk etc. don't have to do it
|
| 340 |
*/
|
| 341 |
addr.sin_family = AF_INET; |
| 342 |
addr.sin_port = 0;
|
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addr.sin_addr.s_addr = INADDR_ANY; |
| 344 |
if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) { |
| 345 |
int lasterrno=errno;
|
| 346 |
closesocket(so->s); |
| 347 |
so->s=-1;
|
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#ifdef _WIN32
|
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WSASetLastError(lasterrno); |
| 350 |
#else
|
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errno=lasterrno; |
| 352 |
#endif
|
| 353 |
} else {
|
| 354 |
/* success, insert in queue */
|
| 355 |
so->so_expire = curtime + SO_EXPIRE; |
| 356 |
insque(so,&udb); |
| 357 |
} |
| 358 |
} |
| 359 |
return(so->s);
|
| 360 |
} |
| 361 |
|
| 362 |
void
|
| 363 |
udp_detach(so) |
| 364 |
struct socket *so;
|
| 365 |
{
|
| 366 |
closesocket(so->s); |
| 367 |
/* if (so->so_m) m_free(so->so_m); done by sofree */
|
| 368 |
|
| 369 |
sofree(so); |
| 370 |
} |
| 371 |
|
| 372 |
struct tos_t udptos[] = {
|
| 373 |
{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
|
| 374 |
{517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
|
| 375 |
{518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
|
| 376 |
{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
|
| 377 |
{0, 0, 0, 0}
|
| 378 |
}; |
| 379 |
|
| 380 |
u_int8_t |
| 381 |
udp_tos(so) |
| 382 |
struct socket *so;
|
| 383 |
{
|
| 384 |
int i = 0; |
| 385 |
|
| 386 |
while(udptos[i].tos) {
|
| 387 |
if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
|
| 388 |
(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
|
| 389 |
so->so_emu = udptos[i].emu; |
| 390 |
return udptos[i].tos;
|
| 391 |
} |
| 392 |
i++; |
| 393 |
} |
| 394 |
|
| 395 |
return 0; |
| 396 |
} |
| 397 |
|
| 398 |
#ifdef EMULATE_TALK
|
| 399 |
#include "talkd.h" |
| 400 |
#endif
|
| 401 |
|
| 402 |
/*
|
| 403 |
* Here, talk/ytalk/ntalk requests must be emulated
|
| 404 |
*/
|
| 405 |
void
|
| 406 |
udp_emu(so, m) |
| 407 |
struct socket *so;
|
| 408 |
struct mbuf *m;
|
| 409 |
{
|
| 410 |
struct sockaddr_in addr;
|
| 411 |
int addrlen = sizeof(addr); |
| 412 |
#ifdef EMULATE_TALK
|
| 413 |
CTL_MSG_OLD *omsg; |
| 414 |
CTL_MSG *nmsg; |
| 415 |
char buff[sizeof(CTL_MSG)]; |
| 416 |
u_char type; |
| 417 |
|
| 418 |
struct talk_request {
|
| 419 |
struct talk_request *next;
|
| 420 |
struct socket *udp_so;
|
| 421 |
struct socket *tcp_so;
|
| 422 |
} *req; |
| 423 |
|
| 424 |
static struct talk_request *req_tbl = 0; |
| 425 |
|
| 426 |
#endif
|
| 427 |
|
| 428 |
struct cu_header {
|
| 429 |
uint16_t d_family; // destination family
|
| 430 |
uint16_t d_port; // destination port
|
| 431 |
uint32_t d_addr; // destination address
|
| 432 |
uint16_t s_family; // source family
|
| 433 |
uint16_t s_port; // source port
|
| 434 |
uint32_t so_addr; // source address
|
| 435 |
uint32_t seqn; // sequence number
|
| 436 |
uint16_t message; // message
|
| 437 |
uint16_t data_type; // data type
|
| 438 |
uint16_t pkt_len; // packet length
|
| 439 |
} *cu_head; |
| 440 |
|
| 441 |
switch(so->so_emu) {
|
| 442 |
|
| 443 |
#ifdef EMULATE_TALK
|
| 444 |
case EMU_TALK:
|
| 445 |
case EMU_NTALK:
|
| 446 |
/*
|
| 447 |
* Talk emulation. We always change the ctl_addr to get
|
| 448 |
* some answers from the daemon. When an ANNOUNCE comes,
|
| 449 |
* we send LEAVE_INVITE to the local daemons. Also when a
|
| 450 |
* DELETE comes, we send copies to the local daemons.
|
| 451 |
*/
|
| 452 |
if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) |
| 453 |
return;
|
| 454 |
|
| 455 |
#define IS_OLD (so->so_emu == EMU_TALK)
|
| 456 |
|
| 457 |
#define COPY_MSG(dest, src) { dest->type = src->type; \
|
| 458 |
dest->id_num = src->id_num; \ |
| 459 |
dest->pid = src->pid; \ |
| 460 |
dest->addr = src->addr; \ |
| 461 |
dest->ctl_addr = src->ctl_addr; \ |
| 462 |
memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \ |
| 463 |
memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \ |
| 464 |
memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); } |
| 465 |
|
| 466 |
#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field) |
| 467 |
/* old_sockaddr to sockaddr_in */
|
| 468 |
|
| 469 |
|
| 470 |
if (IS_OLD) { /* old talk */ |
| 471 |
omsg = mtod(m, CTL_MSG_OLD*); |
| 472 |
nmsg = (CTL_MSG *) buff; |
| 473 |
type = omsg->type; |
| 474 |
OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port; |
| 475 |
OTOSIN(omsg, ctl_addr)->sin_addr = our_addr; |
| 476 |
strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD); |
| 477 |
} else { /* new talk */ |
| 478 |
omsg = (CTL_MSG_OLD *) buff; |
| 479 |
nmsg = mtod(m, CTL_MSG *); |
| 480 |
type = nmsg->type; |
| 481 |
OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port; |
| 482 |
OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr; |
| 483 |
strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD); |
| 484 |
} |
| 485 |
|
| 486 |
if (type == LOOK_UP)
|
| 487 |
return; /* for LOOK_UP this is enough */ |
| 488 |
|
| 489 |
if (IS_OLD) { /* make a copy of the message */ |
| 490 |
COPY_MSG(nmsg, omsg); |
| 491 |
nmsg->vers = 1;
|
| 492 |
nmsg->answer = 0;
|
| 493 |
} else
|
| 494 |
COPY_MSG(omsg, nmsg); |
| 495 |
|
| 496 |
/*
|
| 497 |
* If if is an ANNOUNCE message, we go through the
|
| 498 |
* request table to see if a tcp port has already
|
| 499 |
* been redirected for this socket. If not, we solisten()
|
| 500 |
* a new socket and add this entry to the table.
|
| 501 |
* The port number of the tcp socket and our IP
|
| 502 |
* are put to the addr field of the message structures.
|
| 503 |
* Then a LEAVE_INVITE is sent to both local daemon
|
| 504 |
* ports, 517 and 518. This is why we have two copies
|
| 505 |
* of the message, one in old talk and one in new talk
|
| 506 |
* format.
|
| 507 |
*/
|
| 508 |
|
| 509 |
if (type == ANNOUNCE) {
|
| 510 |
int s;
|
| 511 |
u_short temp_port; |
| 512 |
|
| 513 |
for(req = req_tbl; req; req = req->next)
|
| 514 |
if (so == req->udp_so)
|
| 515 |
break; /* found it */ |
| 516 |
|
| 517 |
if (!req) { /* no entry for so, create new */ |
| 518 |
req = (struct talk_request *)
|
| 519 |
malloc(sizeof(struct talk_request)); |
| 520 |
req->udp_so = so; |
| 521 |
req->tcp_so = solisten(0,
|
| 522 |
OTOSIN(omsg, addr)->sin_addr.s_addr, |
| 523 |
OTOSIN(omsg, addr)->sin_port, |
| 524 |
SS_FACCEPTONCE); |
| 525 |
req->next = req_tbl; |
| 526 |
req_tbl = req; |
| 527 |
} |
| 528 |
|
| 529 |
/* replace port number in addr field */
|
| 530 |
addrlen = sizeof(addr);
|
| 531 |
getsockname(req->tcp_so->s, |
| 532 |
(struct sockaddr *) &addr,
|
| 533 |
&addrlen); |
| 534 |
OTOSIN(omsg, addr)->sin_port = addr.sin_port; |
| 535 |
OTOSIN(omsg, addr)->sin_addr = our_addr; |
| 536 |
OTOSIN(nmsg, addr)->sin_port = addr.sin_port; |
| 537 |
OTOSIN(nmsg, addr)->sin_addr = our_addr; |
| 538 |
|
| 539 |
/* send LEAVE_INVITEs */
|
| 540 |
temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
| 541 |
OTOSIN(omsg, ctl_addr)->sin_port = 0;
|
| 542 |
OTOSIN(nmsg, ctl_addr)->sin_port = 0;
|
| 543 |
omsg->type = nmsg->type = LEAVE_INVITE; |
| 544 |
|
| 545 |
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
| 546 |
addr.sin_addr = our_addr; |
| 547 |
addr.sin_family = AF_INET; |
| 548 |
addr.sin_port = htons(517);
|
| 549 |
sendto(s, (char *)omsg, sizeof(*omsg), 0, |
| 550 |
(struct sockaddr *)&addr, sizeof(addr)); |
| 551 |
addr.sin_port = htons(518);
|
| 552 |
sendto(s, (char *)nmsg, sizeof(*nmsg), 0, |
| 553 |
(struct sockaddr *) &addr, sizeof(addr)); |
| 554 |
closesocket(s) ; |
| 555 |
|
| 556 |
omsg->type = nmsg->type = ANNOUNCE; |
| 557 |
OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
| 558 |
OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; |
| 559 |
} |
| 560 |
|
| 561 |
/*
|
| 562 |
* If it is a DELETE message, we send a copy to the
|
| 563 |
* local daemons. Then we delete the entry corresponding
|
| 564 |
* to our socket from the request table.
|
| 565 |
*/
|
| 566 |
|
| 567 |
if (type == DELETE) {
|
| 568 |
struct talk_request *temp_req, *req_next;
|
| 569 |
int s;
|
| 570 |
u_short temp_port; |
| 571 |
|
| 572 |
temp_port = OTOSIN(omsg, ctl_addr)->sin_port; |
| 573 |
OTOSIN(omsg, ctl_addr)->sin_port = 0;
|
| 574 |
OTOSIN(nmsg, ctl_addr)->sin_port = 0;
|
| 575 |
|
| 576 |
s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP); |
| 577 |
addr.sin_addr = our_addr; |
| 578 |
addr.sin_family = AF_INET; |
| 579 |
addr.sin_port = htons(517);
|
| 580 |
sendto(s, (char *)omsg, sizeof(*omsg), 0, |
| 581 |
(struct sockaddr *)&addr, sizeof(addr)); |
| 582 |
addr.sin_port = htons(518);
|
| 583 |
sendto(s, (char *)nmsg, sizeof(*nmsg), 0, |
| 584 |
(struct sockaddr *)&addr, sizeof(addr)); |
| 585 |
closesocket(s); |
| 586 |
|
| 587 |
OTOSIN(omsg, ctl_addr)->sin_port = temp_port; |
| 588 |
OTOSIN(nmsg, ctl_addr)->sin_port = temp_port; |
| 589 |
|
| 590 |
/* delete table entry */
|
| 591 |
if (so == req_tbl->udp_so) {
|
| 592 |
temp_req = req_tbl; |
| 593 |
req_tbl = req_tbl->next; |
| 594 |
free(temp_req); |
| 595 |
} else {
|
| 596 |
temp_req = req_tbl; |
| 597 |
for(req = req_tbl->next; req; req = req_next) {
|
| 598 |
req_next = req->next; |
| 599 |
if (so == req->udp_so) {
|
| 600 |
temp_req->next = req_next; |
| 601 |
free(req); |
| 602 |
break;
|
| 603 |
} else {
|
| 604 |
temp_req = req; |
| 605 |
} |
| 606 |
} |
| 607 |
} |
| 608 |
} |
| 609 |
|
| 610 |
return;
|
| 611 |
#endif
|
| 612 |
|
| 613 |
case EMU_CUSEEME:
|
| 614 |
|
| 615 |
/*
|
| 616 |
* Cu-SeeMe emulation.
|
| 617 |
* Hopefully the packet is more that 16 bytes long. We don't
|
| 618 |
* do any other tests, just replace the address and port
|
| 619 |
* fields.
|
| 620 |
*/
|
| 621 |
if (m->m_len >= sizeof (*cu_head)) { |
| 622 |
if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0) |
| 623 |
return;
|
| 624 |
cu_head = mtod(m, struct cu_header *);
|
| 625 |
cu_head->s_port = addr.sin_port; |
| 626 |
cu_head->so_addr = our_addr.s_addr; |
| 627 |
} |
| 628 |
|
| 629 |
return;
|
| 630 |
} |
| 631 |
} |
| 632 |
|
| 633 |
struct socket *
|
| 634 |
udp_listen(port, laddr, lport, flags) |
| 635 |
u_int port; |
| 636 |
u_int32_t laddr; |
| 637 |
u_int lport; |
| 638 |
int flags;
|
| 639 |
{
|
| 640 |
struct sockaddr_in addr;
|
| 641 |
struct socket *so;
|
| 642 |
int addrlen = sizeof(struct sockaddr_in), opt = 1; |
| 643 |
|
| 644 |
if ((so = socreate()) == NULL) { |
| 645 |
free(so); |
| 646 |
return NULL; |
| 647 |
} |
| 648 |
so->s = socket(AF_INET,SOCK_DGRAM,0);
|
| 649 |
so->so_expire = curtime + SO_EXPIRE; |
| 650 |
insque(so,&udb); |
| 651 |
|
| 652 |
addr.sin_family = AF_INET; |
| 653 |
addr.sin_addr.s_addr = INADDR_ANY; |
| 654 |
addr.sin_port = port; |
| 655 |
|
| 656 |
if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { |
| 657 |
udp_detach(so); |
| 658 |
return NULL; |
| 659 |
} |
| 660 |
setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); |
| 661 |
/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */
|
| 662 |
|
| 663 |
getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
|
| 664 |
so->so_fport = addr.sin_port; |
| 665 |
if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) |
| 666 |
so->so_faddr = alias_addr; |
| 667 |
else
|
| 668 |
so->so_faddr = addr.sin_addr; |
| 669 |
|
| 670 |
so->so_lport = lport; |
| 671 |
so->so_laddr.s_addr = laddr; |
| 672 |
if (flags != SS_FACCEPTONCE)
|
| 673 |
so->so_expire = 0;
|
| 674 |
|
| 675 |
so->so_state = SS_ISFCONNECTED; |
| 676 |
|
| 677 |
return so;
|
| 678 |
} |