861 lines
20 KiB
C
861 lines
20 KiB
C
/*
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* Copyright (C) 1993-1996 Wolfgang Solfrank.
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* Copyright (C) 1993-1996 TooLs GmbH.
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* 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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/mbuf.h>
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#include <sys/reboot.h>
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#include <sys/systm.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/if_ether.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/udp.h>
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#include <machine/stdarg.h>
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#include <machine/cpu.h>
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#include <machine/psl.h>
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#include <machine/reg.h>
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#include <ipkdb/ipkdb.h>
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#include "debuggers.h"
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#include <machine/ipkdb.h>
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int ipkdbpanic = 0;
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#ifdef IPKDBUSER
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char ipkdbuser = 0; /* allows debugging of user processes by IPKDB when set */
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#endif
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static struct ipkdb_if ipkdb_if;
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#ifdef IPKDBTEST
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static struct ipkdb_if new_if;
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static int ipkdb_test = 0;
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#endif
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static u_char *ipkdbaddr __P((u_char *, int *, void **));
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static void peekmem __P((struct ipkdb_if *, u_char *, void *, long));
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static void pokemem __P((struct ipkdb_if *, u_char *, void *, long));
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static u_int32_t getnl __P((void *));
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static u_int getns __P((void *));
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static void setnl __P((void *, u_int32_t));
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static void setns __P((void *, int));
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static u_short cksum __P((u_short, void *, int));
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static int assemble __P((struct ipkdb_if *, void *));
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static char *inpkt __P((struct ipkdb_if *, char *, int));
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static void outpkt __P((struct ipkdb_if *, char *, int, int, int));
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static void init __P((struct ipkdb_if *));
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static int chksum __P((char *, int));
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static void getpkt __P((struct ipkdb_if *, char *, int *));
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static void putpkt __P((struct ipkdb_if *, char *, int));
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static int maskcmp __P((void *, void *, void *));
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static int check_ipkdb __P((struct ipkdb_if *, struct in_addr *, u_short, u_short, char *, int));
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static int connectipkdb __P((struct ipkdb_if *, char *));
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void
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ipkdb_init()
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{
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ipkdb_if.connect = IPKDB_DEF;
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ipkdbinit();
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if ( ipkdbifinit(&ipkdb_if, 0) < 0
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|| !(ipkdb_if.flags&IPKDB_MYHW)) {
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/* Interface not found, drop IPKDB */
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printf("IPKDB: No interface found!\n");
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ipkdb_if.connect = IPKDB_NOIF;
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boothowto &= ~RB_KDB;
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}
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}
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void
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ipkdb_connect(when)
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int when;
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{
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boothowto |= RB_KDB;
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if (when == 0)
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printf("waiting for remote debugger\n");
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ipkdb_trap();
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#ifdef IPKDBTEST
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new_if.connect = IPKDB_ALL;
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if ( ipkdbifinit(&new_if, 1) < 0
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|| !(new_if.flags&IPKDB_MYHW)) {
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/* Interface not found, no test */
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return;
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}
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init(&new_if);
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putpkt(&new_if, "s", 1);
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for (ipkdb_test = 1; ipkdb_test;) {
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static char buf[512];
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int plen;
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getpkt(&new_if, buf, &plen);
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if (!plen)
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continue;
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putpkt(&new_if, "eunknown command", 16);
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}
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#endif
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}
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void
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ipkdb_panic()
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{
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if (ipkdb_if.connect == IPKDB_NOIF)
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return;
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ipkdbpanic = 1;
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ipkdb_trap();
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}
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int
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ipkdbcmds()
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{
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static char buf[512];
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char *cp;
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int plen;
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if (!(ipkdb_if.flags&IPKDB_MYHW)) /* no interface */
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return 2;
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init(&ipkdb_if);
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if (ipkdbpanic > 1) {
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ipkdb_if.leave(&ipkdb_if);
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return 0;
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}
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putpkt(&ipkdb_if, "s", 1);
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while (1) {
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getpkt(&ipkdb_if, buf, &plen);
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if (!plen) {
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if (ipkdbpanic && ipkdb_poll()) {
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ipkdb_if.leave(&ipkdb_if);
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return 0;
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} else
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continue;
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} else
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ipkdbpanic = 0;
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switch (*buf) {
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default:
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putpkt(&ipkdb_if, "eunknown command", 16);
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break;
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case 'O':
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/* This is an allowed reconnect, ack it */
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putpkt(&ipkdb_if, "s", 1);
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break;
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case 'R':
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peekmem(&ipkdb_if, buf, ipkdbregs, sizeof ipkdbregs);
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break;
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case 'W':
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if (plen != sizeof ipkdbregs + 1) {
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putpkt(&ipkdb_if, "einvalid register size", 22);
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break;
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}
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pokemem(&ipkdb_if, buf + 1, ipkdbregs, sizeof ipkdbregs);
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break;
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case 'M':
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{
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void *addr, *len;
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plen--;
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if ( !(cp = ipkdbaddr(buf + 1, &plen, &addr))
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|| !ipkdbaddr(cp, &plen, &len)) {
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putpkt(&ipkdb_if, "einvalid peek format", 20);
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break;
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}
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peekmem(&ipkdb_if, buf, addr, (long)len);
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break;
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}
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case 'N':
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{
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void *addr, *len;
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plen--;
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if ( !(cp = ipkdbaddr(buf + 1, &plen, &addr))
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|| !(cp = ipkdbaddr(cp, &plen, &len))
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|| plen < (long)len) {
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putpkt(&ipkdb_if, "einvalid poke format", 20);
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break;
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}
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pokemem(&ipkdb_if, cp, addr, (long)len);
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break;
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}
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case 'S':
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ipkdb_if.leave(&ipkdb_if);
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return 1;
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case 'X':
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putpkt(&ipkdb_if, "ok",2);
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#ifdef IPKDBUSER
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ipkdbuser = 0;
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#endif
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ipkdb_if.connect = IPKDB_DEF; /* ??? */
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ipkdb_if.leave(&ipkdb_if);
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return 2;
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case 'C':
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ipkdb_if.leave(&ipkdb_if);
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return 0;
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}
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}
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}
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static u_char *
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ipkdbaddr(cp, pl, dp)
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u_char *cp;
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int *pl;
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void **dp;
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{
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/* Assume that sizeof(void *) <= sizeof(u_long) */
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u_long l;
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int i;
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if ((*pl -= sizeof *dp) < 0)
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return 0;
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for (i = sizeof *dp, l = 0; --i >= 0;) {
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l <<= 8;
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l |= *cp++;
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}
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*dp = (void *)l;
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return cp;
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}
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static void
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peekmem(ifp, buf, addr, len)
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struct ipkdb_if *ifp;
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u_char *buf;
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void *addr;
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long len;
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{
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u_char *cp, *p = addr;
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int l;
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cp = buf;
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*cp++ = 'p';
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for (l = len; --l >= 0;)
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*cp++ = ipkdbfbyte(p++);
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putpkt(ifp, buf, len + 1);
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}
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static void
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pokemem(ifp, cp, addr, len)
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struct ipkdb_if *ifp;
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u_char *cp;
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void *addr;
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long len;
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{
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int c;
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u_char *p = addr;
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while (--len >= 0)
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ipkdbsbyte(p++, *cp++);
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putpkt(ifp, "ok", 2);
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}
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__inline static u_int32_t
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getnl(vs)
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void *vs;
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{
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u_char *s = vs;
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return (*s << 24)|(s[1] << 16)|(s[2] << 8)|s[3];
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}
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__inline static u_int
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getns(vs)
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void *vs;
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{
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u_char *s = vs;
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return (*s << 8)|s[1];
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}
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__inline static void
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setnl(vs, l)
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void *vs;
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u_int32_t l;
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{
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u_char *s = vs;
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*s++ = l >> 24;
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*s++ = l >> 16;
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*s++ = l >> 8;
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*s = l;
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}
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__inline static void
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setns(vs, l)
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void *vs;
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int l;
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{
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u_char *s = vs;
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*s++ = l >> 8;
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*s = l;
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}
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static u_short
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cksum(st, vcp, l)
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u_short st;
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void *vcp;
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int l;
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{
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u_char *cp = vcp;
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u_long s;
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for (s = st; (l -= 2) >= 0; cp += 2)
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s += (*cp << 8) + cp[1];
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if (l == -1)
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s += *cp << 8;
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while (s&0xffff0000)
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s = (s&0xffff) + (s >> 16);
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return s == 0xffff ? 0 : s;
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}
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static int
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assemble(ifp, buf)
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struct ipkdb_if *ifp;
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void *buf;
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{
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struct ip *ip, iph;
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int off, len, i;
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u_char *cp, *ecp;
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ip = (struct ip *)buf;
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ipkdbcopy(ip, &iph, sizeof iph);
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iph.ip_hl = 5;
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iph.ip_tos = 0;
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iph.ip_len = 0;
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iph.ip_off = 0;
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iph.ip_ttl = 0;
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iph.ip_sum = 0;
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if (ifp->asslen) {
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if (ipkdbcmp(&iph, ifp->ass, sizeof iph)) {
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/*
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* different packet
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* decide whether to keep the old
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* or start a new one
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*/
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i = getns(&ip->ip_id)^getns(&((struct ip *)ifp->ass)->ip_id);
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i ^= (i >> 2)^(i >> 4)^(i >> 8)^(i >> 12);
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if (i&1)
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/* keep the old */
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return 0;
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ifp->asslen = 0;
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}
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}
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if (!ifp->asslen) {
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ipkdbzero(ifp->assbit, sizeof ifp->assbit);
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ipkdbcopy(&iph, ifp->ass, sizeof iph);
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}
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off = getns(&ip->ip_off);
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len = ((off&IP_OFFMASK) << 3) + getns(&ip->ip_len) - ip->ip_hl * 4;
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if (ifp->asslen < len)
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ifp->asslen = len;
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if (ifp->asslen + sizeof *ip > sizeof ifp->ass) {
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/* packet too long */
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ifp->asslen = 0;
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return 0;
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}
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if (!(off&IP_MF)) {
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off &= IP_OFFMASK;
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cp = ifp->assbit + (off >> 3);
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for (i = off & 7; i < 8; *cp |= 1 << i++);
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for (; cp < ifp->assbit + sizeof ifp->assbit; *cp++ = -1);
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} else {
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off &= IP_OFFMASK;
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cp = ifp->assbit + (off >> 3);
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ecp = ifp->assbit + (len >> 6);
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if (cp == ecp)
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for (i = off & 7; i <= (len >> 3)&7; *cp |= 1 << i++);
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else {
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for (i = off & 7; i < 8; *cp |= 1 << i++);
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for (; ++cp < ecp; *cp = -1);
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for (i = 0; i < ((len >> 3)&7); *cp |= 1 << i++);
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}
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}
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ipkdbcopy(buf + ip->ip_hl * 4,
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ifp->ass + sizeof *ip + (off << 3),
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len - (off << 3));
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for (cp = ifp->assbit; cp < ifp->assbit + sizeof ifp->assbit;)
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if (*cp++ != (u_char)-1)
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/* not complete */
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return 0;
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ip = (struct ip *)ifp->ass;
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setns(&ip->ip_len, sizeof *ip + ifp->asslen);
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/* complete */
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return 1;
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}
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static char *
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inpkt(ifp, ibuf, poll)
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struct ipkdb_if *ifp;
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char *ibuf;
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int poll;
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{
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int cnt = 1000000;
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int l, ul;
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struct ether_header *eh;
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struct ether_arp *ah;
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struct ip *ip;
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struct udphdr *udp;
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struct ipovly ipo;
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while (1) {
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l = ifp->receive(ifp, ibuf, poll != 0);
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if (!l) {
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if (poll == 1 || (poll == 2 && --cnt <= 0))
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break;
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else
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continue;
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}
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eh = (struct ether_header *)ibuf;
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switch (getns(&eh->ether_type)) {
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case ETHERTYPE_ARP:
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ah = (struct ether_arp *)(ibuf + 14);
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if ( getns(&ah->arp_hrd) != ARPHRD_ETHER
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|| getns(&ah->arp_pro) != ETHERTYPE_IP
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|| ah->arp_hln != 6
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|| ah->arp_pln != 4)
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/* unsupported arp packet */
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break;
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switch (getns(&ah->arp_op)) {
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case ARPOP_REQUEST:
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if ( (ifp->flags&IPKDB_MYIP)
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&& !ipkdbcmp(ah->arp_tpa,
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ifp->myinetaddr,
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sizeof ifp->myinetaddr)) {
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/* someone requested my address */
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ipkdbcopy(eh->ether_shost,
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eh->ether_dhost,
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sizeof eh->ether_dhost);
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ipkdbcopy(ifp->myenetaddr,
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eh->ether_shost,
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sizeof eh->ether_shost);
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setns(&ah->arp_op, ARPOP_REPLY);
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ipkdbcopy(ah->arp_sha,
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ah->arp_tha,
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sizeof ah->arp_tha);
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ipkdbcopy(ah->arp_spa,
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ah->arp_tpa,
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sizeof ah->arp_tpa);
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ipkdbcopy(ifp->myenetaddr,
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ah->arp_sha,
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sizeof ah->arp_sha);
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ipkdbcopy(ifp->myinetaddr,
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ah->arp_spa,
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sizeof ah->arp_spa);
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ifp->send(ifp, ibuf, 74);
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continue;
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}
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break;
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default:
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break;
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}
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break;
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case ETHERTYPE_IP:
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if (ipkdbcmp(eh->ether_dhost,
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ifp->myenetaddr,
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sizeof ifp->myenetaddr))
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/* not only for us */
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break;
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ip = (struct ip *)(ibuf + 14);
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if ( ip->ip_v != IPVERSION
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|| ip->ip_hl < 5
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|| getns(&ip->ip_len) + 14 > l)
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/* invalid packet */
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break;
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if (cksum(0, ip, ip->ip_hl * 4))
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/* wrong checksum */
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break;
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if (ip->ip_p != IPPROTO_UDP)
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break;
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if (getns(&ip->ip_off)&~IP_DF) {
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if (!assemble(ifp, ip))
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break;
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ip = (struct ip *)ifp->ass;
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ifp->asslen = 0;
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}
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udp = (struct udphdr *)((char *)ip + ip->ip_hl * 4);
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ul = getns(&ip->ip_len) - ip->ip_hl * 4;
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if (getns(&udp->uh_ulen) != ul)
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/* invalid UDP packet length */
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break;
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ipkdbcopy(ip, &ipo, sizeof ipo);
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ipkdbzero(ipo.ih_x1, sizeof ipo.ih_x1);
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ipo.ih_len = udp->uh_ulen;
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if ( udp->uh_sum
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&& cksum(cksum(0, &ipo, sizeof ipo), udp, ul))
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|
/* wrong checksum */
|
|
break;
|
|
if (!(ifp->flags&IPKDB_MYIP)) {
|
|
if ( getns(&udp->uh_sport) == 67
|
|
&& getns(&udp->uh_dport) == 68
|
|
&& *(char *)(udp + 1) == 2) {
|
|
/* this is a BOOTP reply to our ethernet address */
|
|
/* should check a bit more? XXX */
|
|
ipkdbcopy(&ip->ip_dst,
|
|
ifp->myinetaddr,
|
|
sizeof ifp->myinetaddr);
|
|
ifp->flags |= IPKDB_MYIP;
|
|
}
|
|
/* give caller a chance to resend his request */
|
|
return 0;
|
|
}
|
|
if ( ipkdbcmp(&ip->ip_dst, ifp->myinetaddr, sizeof ifp->myinetaddr)
|
|
|| getns(&udp->uh_sport) != IPKDBPORT
|
|
|| getns(&udp->uh_dport) != IPKDBPORT)
|
|
break;
|
|
/* so now it's a UDP packet for the debugger */
|
|
{
|
|
/* Check for reconnect packet */
|
|
u_char *p;
|
|
|
|
p = (u_char *)(udp + 1);
|
|
if (!getnl(p) && p[6] == 'O') {
|
|
l = getns(p + 4);
|
|
if ( l <= ul - sizeof *udp - 6
|
|
&& check_ipkdb(ifp, &ip->ip_src, udp->uh_sport,
|
|
udp->uh_dport, p + 6, l)) {
|
|
ipkdbcopy(&ip->ip_src,
|
|
ifp->hisinetaddr,
|
|
sizeof ifp->hisinetaddr);
|
|
ipkdbcopy(eh->ether_shost,
|
|
ifp->hisenetaddr,
|
|
sizeof ifp->hisenetaddr);
|
|
ifp->flags |= IPKDB_HISHW|IPKDB_HISIP;
|
|
return p;
|
|
}
|
|
}
|
|
}
|
|
if ( (ifp->flags&IPKDB_HISIP)
|
|
&& ipkdbcmp(&ip->ip_src,
|
|
ifp->hisinetaddr, sizeof ifp->hisinetaddr))
|
|
/* It's a packet from someone else */
|
|
break;
|
|
if (!(ifp->flags&IPKDB_HISIP)) {
|
|
ifp->flags |= IPKDB_HISIP;
|
|
ipkdbcopy(&ip->ip_src,
|
|
ifp->hisinetaddr, sizeof ifp->hisinetaddr);
|
|
}
|
|
if (!(ifp->flags&IPKDB_HISHW)) {
|
|
ifp->flags |= IPKDB_HISHW;
|
|
ipkdbcopy(eh->ether_shost,
|
|
ifp->hisenetaddr, sizeof ifp->hisenetaddr);
|
|
}
|
|
return (char *)(udp + 1);
|
|
default:
|
|
/* unknown type */
|
|
break;
|
|
}
|
|
if (l)
|
|
ipkdbgotpkt(ifp, ibuf, l);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static short ipkdb_ipid = 0;
|
|
|
|
static void
|
|
outpkt(ifp, in, l, srcport, dstport)
|
|
struct ipkdb_if *ifp;
|
|
char *in;
|
|
int l;
|
|
int srcport, dstport;
|
|
{
|
|
u_char *sp;
|
|
struct ether_header *eh;
|
|
struct ip *ip;
|
|
struct udphdr *udp;
|
|
u_char *cp;
|
|
char obuf[ETHERMTU+14];
|
|
struct ipovly ipo;
|
|
int i, off;
|
|
|
|
ipkdbzero(obuf, sizeof obuf);
|
|
eh = (struct ether_header *)obuf;
|
|
if (!(ifp->flags&IPKDB_HISHW))
|
|
for (cp = eh->ether_dhost; cp < eh->ether_dhost + sizeof eh->ether_dhost;)
|
|
*cp++ = -1;
|
|
else
|
|
ipkdbcopy(ifp->hisenetaddr, eh->ether_dhost, sizeof eh->ether_dhost);
|
|
ipkdbcopy(ifp->myenetaddr, eh->ether_shost, sizeof eh->ether_shost);
|
|
setns(&eh->ether_type, ETHERTYPE_IP);
|
|
ip = (struct ip *)(obuf + 14);
|
|
ip->ip_v = IPVERSION;
|
|
ip->ip_hl = 5;
|
|
setns(&ip->ip_id, ipkdb_ipid++);
|
|
ip->ip_ttl = 255;
|
|
ip->ip_p = IPPROTO_UDP;
|
|
ipkdbcopy(ifp->myinetaddr, &ip->ip_src, sizeof ip->ip_src);
|
|
ipkdbcopy(ifp->hisinetaddr, &ip->ip_dst, sizeof ip->ip_dst);
|
|
udp = (struct udphdr *)(ip + 1);
|
|
setns(&udp->uh_sport, srcport);
|
|
setns(&udp->uh_dport, dstport);
|
|
setns(&udp->uh_ulen, l + sizeof *udp);
|
|
ipkdbcopy(ip, &ipo, sizeof ipo);
|
|
ipkdbzero(ipo.ih_x1, sizeof ipo.ih_x1);
|
|
ipo.ih_len = udp->uh_ulen;
|
|
setns(&udp->uh_sum,
|
|
~cksum(cksum(cksum(0, &ipo, sizeof ipo),
|
|
udp, sizeof *udp),
|
|
in, l));
|
|
for (cp = (u_char *)(udp + 1), l += sizeof *udp, off = 0;
|
|
l > 0;
|
|
l -= i, in += i, off += i, cp = (u_char *)udp) {
|
|
i = l > ifp->mtu - sizeof *ip ? ((ifp->mtu - sizeof *ip)&~7) : l;
|
|
ipkdbcopy(in, cp, i);
|
|
setns(&ip->ip_len, i + sizeof *ip);
|
|
setns(&ip->ip_off, (l > i ? IP_MF : 0)|(off >> 3));
|
|
ip->ip_sum = 0;
|
|
setns(&ip->ip_sum, ~cksum(0, ip, sizeof *ip));
|
|
if (i + sizeof *ip < ETHERMIN)
|
|
i = ETHERMIN - sizeof *ip;
|
|
ifp->send(ifp, obuf, i + sizeof *ip + 14);
|
|
}
|
|
}
|
|
|
|
static void
|
|
init(ifp)
|
|
struct ipkdb_if *ifp;
|
|
{
|
|
u_char *cp;
|
|
struct ether_header *eh;
|
|
struct ip *ip;
|
|
struct udphdr *udp;
|
|
u_char buf[ETHERMTU+14];
|
|
struct ipovly ipo;
|
|
int secs = 0;
|
|
|
|
ifp->start(ifp);
|
|
#ifdef __notyet__
|
|
if (!(ifp->flags&IPKDB_MYIP))
|
|
ipkdbinet(ifp);
|
|
#endif
|
|
if (ifp->flags&IPKDB_MYIP)
|
|
return;
|
|
|
|
while (!(ifp->flags&IPKDB_MYIP)) {
|
|
ipkdbzero(buf, sizeof buf);
|
|
cp = buf;
|
|
*cp++ = 1; /* BOOTP_REQUEST */
|
|
*cp++ = 1; /* Ethernet hardware */
|
|
*cp++ = 6; /* length of address */
|
|
setnl(++cp, 0x12345678); /* some random number? */
|
|
setns(cp + 4, secs++);
|
|
ipkdbcopy(ifp->myenetaddr, cp + 24, sizeof ifp->myenetaddr);
|
|
outpkt(ifp, buf, 300, 68, 67);
|
|
inpkt(ifp, buf, 2);
|
|
if (ipkdbpanic && ipkdb_poll()) {
|
|
ipkdbpanic++;
|
|
return;
|
|
}
|
|
}
|
|
cp = ifp->myinetaddr;
|
|
printf("My IP address is %d.%d.%d.%d\n",
|
|
cp[0], cp[1], cp[2], cp[3]);
|
|
}
|
|
|
|
static int
|
|
chksum(p, l)
|
|
char *p;
|
|
int l;
|
|
{
|
|
char csum;
|
|
|
|
for (csum = 0; --l >= 0; csum += *p++);
|
|
return csum;
|
|
}
|
|
|
|
static void
|
|
getpkt(ifp, buf, lp)
|
|
struct ipkdb_if *ifp;
|
|
char *buf;
|
|
int *lp;
|
|
{
|
|
char *got;
|
|
int l;
|
|
char ibuf[ETHERMTU+14];
|
|
|
|
*lp = 0;
|
|
while (1) {
|
|
if (!(got = inpkt(ifp, ibuf, ipkdbpanic != 0))) {
|
|
*lp = 0;
|
|
return;
|
|
}
|
|
if ( ifp->seq == getnl(got)
|
|
&& got[6] >= 'A'
|
|
&& got[6] <= 'Z'
|
|
&& (l = getns(got + 4))
|
|
&& (got[6] == 'O' || chksum(got + 6, l) == got[l + 6])) {
|
|
ipkdbcopy(got + 6, buf, *lp = l);
|
|
return;
|
|
}
|
|
if ( ifp->pktlen
|
|
&& ((ifp->flags&(IPKDB_MYIP|IPKDB_HISIP|IPKDB_CONNECTED))
|
|
== (IPKDB_MYIP|IPKDB_HISIP|IPKDB_CONNECTED)))
|
|
outpkt(ifp, ifp->pkt, ifp->pktlen, IPKDBPORT, IPKDBPORT);
|
|
}
|
|
}
|
|
|
|
static void
|
|
putpkt(ifp, buf, l)
|
|
struct ipkdb_if *ifp;
|
|
char *buf;
|
|
int l;
|
|
{
|
|
setnl(ifp->pkt, ifp->seq++);
|
|
setns(ifp->pkt + 4, l);
|
|
ipkdbcopy(buf, ifp->pkt + 6, l);
|
|
ifp->pkt[l + 6] = chksum(ifp->pkt + 6, l);
|
|
ifp->pktlen = l + 7;
|
|
if ( (ifp->flags&(IPKDB_MYIP|IPKDB_HISIP|IPKDB_CONNECTED))
|
|
!= (IPKDB_MYIP|IPKDB_HISIP|IPKDB_CONNECTED))
|
|
return;
|
|
outpkt(ifp, ifp->pkt, ifp->pktlen, IPKDBPORT, IPKDBPORT);
|
|
}
|
|
|
|
static __inline int
|
|
maskcmp(vin, vmask, vmatch)
|
|
void *vin, *vmask, *vmatch;
|
|
{
|
|
int i;
|
|
u_char *in = vin, *mask = vmask, *match = vmatch;
|
|
|
|
for (i = 4; --i >= 0;)
|
|
if ((*in++&*mask++) != *match++)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
check_ipkdb(ifp, shost, sport, dport, p, l)
|
|
struct ipkdb_if *ifp;
|
|
struct in_addr *shost;
|
|
u_short sport, dport;
|
|
char *p;
|
|
int l;
|
|
{
|
|
u_char hisenet[6];
|
|
u_char hisinet[4];
|
|
char save;
|
|
struct ipkdb_allow *kap;
|
|
|
|
if (chksum(p, l) != p[l])
|
|
return 0;
|
|
p[l] = 0;
|
|
switch (ifp->connect) {
|
|
default:
|
|
return 0;
|
|
case IPKDB_SAME:
|
|
if (ipkdbcmp(shost, ifp->hisinetaddr, sizeof ifp->hisinetaddr))
|
|
return 0;
|
|
if (getns(&sport) != IPKDBPORT || getns(&dport) != IPKDBPORT)
|
|
return 0;
|
|
bzero(&hisinet, sizeof hisinet);
|
|
break;
|
|
case IPKDB_ALL:
|
|
for (kap = ipkdballow; kap < ipkdballow + ipkdbcount; kap++) {
|
|
if (maskcmp(shost, kap->mask, kap->match))
|
|
break;
|
|
}
|
|
if (kap >= ipkdballow + ipkdbcount)
|
|
return 0;
|
|
if (getns(&sport) != IPKDBPORT || getns(&dport) != IPKDBPORT)
|
|
return 0;
|
|
ipkdbcopy(ifp->hisenetaddr, hisenet, sizeof hisenet);
|
|
ipkdbcopy(ifp->hisinetaddr, hisinet, sizeof hisinet);
|
|
save = ifp->flags;
|
|
ipkdbcopy(shost, ifp->hisinetaddr, sizeof ifp->hisinetaddr);
|
|
ifp->flags &= ~IPKDB_HISHW;
|
|
ifp->flags |= IPKDB_HISIP;
|
|
break;
|
|
}
|
|
if (connectipkdb(ifp, p) < 0) {
|
|
if (ifp->connect == IPKDB_ALL) {
|
|
ipkdbcopy(hisenet, ifp->hisenetaddr, sizeof ifp->hisenetaddr);
|
|
ipkdbcopy(hisinet, ifp->hisinetaddr, sizeof ifp->hisinetaddr);
|
|
ipkdb_if.flags = save;
|
|
}
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Should check whether packet came across the correct interface
|
|
*/
|
|
int
|
|
checkipkdb(shost, sport, dport, m, off, len)
|
|
struct in_addr *shost;
|
|
u_short sport, dport;
|
|
struct mbuf *m;
|
|
{
|
|
char *p;
|
|
int l;
|
|
char ibuf[ETHERMTU+50];
|
|
|
|
m_copydata(m, off, len, ibuf);
|
|
p = ibuf;
|
|
if (getnl(p) || p[6] != 'O')
|
|
return 0;
|
|
l = getns(p + 4);
|
|
if (l > len - 6 || !check_ipkdb(&ipkdb_if, shost, sport, dport, p + 6, l))
|
|
return 0;
|
|
ipkdb_connect(1);
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
connectipkdb(ifp, buf)
|
|
struct ipkdb_if *ifp;
|
|
char *buf;
|
|
{
|
|
char *cp;
|
|
u_char *ip;
|
|
|
|
if (*buf != 'O')
|
|
return -1;
|
|
if (getnl(buf + 1) == ifp->id)
|
|
/* It's a retry of a connect packet, ignore it */
|
|
return -1;
|
|
for (cp = buf + 1 + sizeof(u_int32_t); *cp && *cp != ':'; cp++);
|
|
if (!*cp)
|
|
return -1;
|
|
*cp++ = 0;
|
|
ip = ifp->hisinetaddr;
|
|
printf("debugged by %s@%s (%d.%d.%d.%d)\n", buf + 1 + sizeof(u_int32_t), cp,
|
|
ip[0], ip[1], ip[2], ip[3]);
|
|
ifp->connect = IPKDB_SAME; /* if someone once connected, he may do so again */
|
|
ifp->flags |= IPKDB_CONNECTED;
|
|
ifp->seq = 0;
|
|
ifp->pktlen = 0;
|
|
ifp->id = getnl(buf + 1);
|
|
return 0;
|
|
}
|