636 lines
15 KiB
C
636 lines
15 KiB
C
/*
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* This tool requests configuration info from a multicast router
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* and prints the reply (if any). Invoke it as:
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*
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* mrinfo router-name-or-address
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*
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* Written Wed Mar 24 1993 by Van Jacobson (adapted from the
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* multicast mapper written by Pavel Curtis).
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*
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* The lawyers insist we include the following UC copyright notice.
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* The mapper from which this is derived contained a Xerox copyright
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* notice which follows the UC one. Try not to get depressed noting
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* that the legal gibberish is larger than the program.
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*
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* Copyright (c) 1993 Regents of the University of California.
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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 the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* 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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* Copyright (c) Xerox Corporation 1992. All rights reserved.
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*
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* License is granted to copy, to use, and to make and to use derivative works
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* for research and evaluation purposes, provided that Xerox is acknowledged
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* in all documentation pertaining to any such copy or derivative work. Xerox
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* grants no other licenses expressed or implied. The Xerox trade name should
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* not be used in any advertising without its written permission.
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*
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* XEROX CORPORATION MAKES NO REPRESENTATIONS CONCERNING EITHER THE
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* MERCHANTABILITY OF THIS SOFTWARE OR THE SUITABILITY OF THIS SOFTWARE FOR
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* ANY PARTICULAR PURPOSE. The software is provided "as is" without express
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* or implied warranty of any kind.
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*
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* These notices must be retained in any copies of any part of this software.
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*/
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#ifndef lint
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static char rcsid[] =
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"@(#) $Id$";
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/* original rcsid:
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"@(#) Header: mrinfo.c,v 1.6 93/04/08 15:14:16 van Exp (LBL)";
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*/
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#endif
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#include <netdb.h>
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#include <sys/time.h>
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#include "defs.h"
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#include <arpa/inet.h>
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#ifdef __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#define DEFAULT_TIMEOUT 4 /* How long to wait before retrying requests */
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#define DEFAULT_RETRIES 3 /* How many times to ask each router */
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u_int32 our_addr, target_addr = 0; /* in NET order */
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int debug = 0;
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int nflag = 0;
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int retries = DEFAULT_RETRIES;
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int timeout = DEFAULT_TIMEOUT;
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int target_level = 0;
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vifi_t numvifs; /* to keep loader happy */
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/* (see COPY_TABLES macro called in kern.c) */
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char * inet_name __P((u_int32 addr));
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void ask __P((u_int32 dst));
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void ask2 __P((u_int32 dst));
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int get_number __P((int *var, int deflt, char ***pargv,
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int *pargc));
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u_int32 host_addr __P((char *name));
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void usage __P((void));
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/* to shut up -Wstrict-prototypes */
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int main __P((int argc, char *argv[]));
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char *
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inet_name(addr)
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u_int32 addr;
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{
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struct hostent *e;
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struct in_addr in;
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if (addr == 0)
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return "local";
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if (nflag ||
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(e = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET)) == NULL) {
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in.s_addr = addr;
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return (inet_ntoa(in));
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}
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return (e->h_name);
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}
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/*
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* Log errors and other messages to stderr, according to the severity of the
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* message and the current debug level. For errors of severity LOG_ERR or
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* worse, terminate the program.
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*/
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#ifdef __STDC__
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void
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log(int severity, int syserr, char *format, ...)
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{
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va_list ap;
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char fmt[100];
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va_start(ap, format);
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#else
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void
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log(severity, syserr, format, va_alist)
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int severity, syserr;
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char *format;
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va_dcl
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{
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va_list ap;
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char fmt[100];
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va_start(ap);
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#endif
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switch (debug) {
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case 0:
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if (severity > LOG_WARNING)
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return;
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case 1:
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if (severity > LOG_NOTICE)
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return;
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case 2:
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if (severity > LOG_INFO)
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return;
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default:
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fmt[0] = '\0';
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if (severity == LOG_WARNING)
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strcat(fmt, "warning - ");
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strncat(fmt, format, 80);
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vfprintf(stderr, fmt, ap);
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if (syserr == 0)
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fprintf(stderr, "\n");
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else if (syserr < sys_nerr)
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fprintf(stderr, ": %s\n", sys_errlist[syserr]);
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else
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fprintf(stderr, ": errno %d\n", syserr);
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}
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if (severity <= LOG_ERR)
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exit(-1);
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}
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/*
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* Send a neighbors-list request.
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*/
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void
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ask(dst)
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u_int32 dst;
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{
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send_igmp(our_addr, dst, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS,
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htonl(MROUTED_LEVEL), 0);
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}
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void
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ask2(dst)
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u_int32 dst;
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{
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send_igmp(our_addr, dst, IGMP_DVMRP, DVMRP_ASK_NEIGHBORS2,
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htonl(MROUTED_LEVEL), 0);
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}
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/*
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* Process an incoming neighbor-list message.
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*/
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void
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accept_neighbors(src, dst, p, datalen, level)
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u_int32 src, dst, level;
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u_char *p;
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int datalen;
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{
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u_char *ep = p + datalen;
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#define GET_ADDR(a) (a = ((u_int32)*p++ << 24), a += ((u_int32)*p++ << 16),\
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a += ((u_int32)*p++ << 8), a += *p++)
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printf("%s (%s):\n", inet_fmt(src, s1), inet_name(src));
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while (p < ep) {
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register u_int32 laddr;
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register u_char metric;
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register u_char thresh;
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register int ncount;
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GET_ADDR(laddr);
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laddr = htonl(laddr);
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metric = *p++;
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thresh = *p++;
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ncount = *p++;
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while (--ncount >= 0) {
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register u_int32 neighbor;
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GET_ADDR(neighbor);
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neighbor = htonl(neighbor);
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printf(" %s -> ", inet_fmt(laddr, s1));
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printf("%s (%s) [%d/%d]\n", inet_fmt(neighbor, s1),
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inet_name(neighbor), metric, thresh);
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}
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}
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}
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void
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accept_neighbors2(src, dst, p, datalen, level)
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u_int32 src, dst, level;
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u_char *p;
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int datalen;
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{
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u_char *ep = p + datalen;
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u_int broken_cisco = ((level & 0xffff) == 0x020a); /* 10.2 */
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/* well, only possibly_broken_cisco, but that's too long to type. */
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printf("%s (%s) [version %d.%d", inet_fmt(src, s1), inet_name(src),
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level & 0xff, (level >> 8) & 0xff);
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if ((level >> 16) & NF_LEAF) { printf (",leaf"); }
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if ((level >> 16) & NF_PRUNE) { printf (",prune"); }
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if ((level >> 16) & NF_GENID) { printf (",genid"); }
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if ((level >> 16) & NF_MTRACE) { printf (",mtrace"); }
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printf ("]:\n");
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while (p < ep) {
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register u_char metric;
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register u_char thresh;
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register u_char flags;
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register int ncount;
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register u_int32 laddr = *(u_int32*)p;
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p += 4;
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metric = *p++;
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thresh = *p++;
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flags = *p++;
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ncount = *p++;
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if (broken_cisco && ncount == 0) /* dumb Ciscos */
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ncount = 1;
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if (broken_cisco && ncount > 15) /* dumb Ciscos */
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ncount = ncount & 0xf;
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while (--ncount >= 0 && p < ep) {
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register u_int32 neighbor = *(u_int32*)p;
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p += 4;
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printf(" %s -> ", inet_fmt(laddr, s1));
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printf("%s (%s) [%d/%d", inet_fmt(neighbor, s1),
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inet_name(neighbor), metric, thresh);
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if (flags & DVMRP_NF_TUNNEL)
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printf("/tunnel");
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if (flags & DVMRP_NF_SRCRT)
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printf("/srcrt");
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if (flags & DVMRP_NF_PIM)
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printf("/pim");
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if (flags & DVMRP_NF_QUERIER)
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printf("/querier");
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if (flags & DVMRP_NF_DISABLED)
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printf("/disabled");
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if (flags & DVMRP_NF_DOWN)
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printf("/down");
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if (flags & DVMRP_NF_LEAF)
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printf("/leaf");
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printf("]\n");
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}
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}
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}
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int
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get_number(var, deflt, pargv, pargc)
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int *var, *pargc, deflt;
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char ***pargv;
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{
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if ((*pargv)[0][2] == '\0') { /* Get the value from the next
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* argument */
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if (*pargc > 1 && isdigit((*pargv)[1][0])) {
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(*pargv)++, (*pargc)--;
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*var = atoi((*pargv)[0]);
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return 1;
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} else if (deflt >= 0) {
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*var = deflt;
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return 1;
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} else
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return 0;
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} else { /* Get value from the rest of this argument */
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if (isdigit((*pargv)[0][2])) {
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*var = atoi((*pargv)[0] + 2);
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return 1;
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} else {
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return 0;
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}
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}
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}
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void
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usage()
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{
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fprintf(stderr,
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"Usage: mrinfo [-n] [-t timeout] [-r retries] [router]\n");
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exit(1);
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}
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int tries;
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int trynew;
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struct timeval et;
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struct hostent *hp;
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struct hostent bogus;
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char *host;
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int curaddr;
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if (geteuid() != 0) {
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fprintf(stderr, "mrinfo: must be root\n");
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exit(1);
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}
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init_igmp();
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setuid(getuid());
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setlinebuf(stderr);
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argv++, argc--;
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while (argc > 0 && argv[0][0] == '-') {
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switch (argv[0][1]) {
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case 'd':
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if (!get_number(&debug, DEFAULT_DEBUG, &argv, &argc))
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usage();
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break;
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case 'n':
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++nflag;
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break;
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case 'r':
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if (!get_number(&retries, -1, &argv, &argc))
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usage();
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break;
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case 't':
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if (!get_number(&timeout, -1, &argv, &argc))
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usage();
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break;
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default:
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usage();
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}
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argv++, argc--;
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}
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if (argc > 1)
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usage();
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if (argc == 1)
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host = argv[0];
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else
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host = "127.0.0.1";
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if ((target_addr = inet_addr(host)) != -1) {
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hp = &bogus;
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hp->h_length = sizeof(target_addr);
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hp->h_addr_list = (char **)malloc(2 * sizeof(char *));
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hp->h_addr_list[0] = malloc(hp->h_length);
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memcpy(hp->h_addr_list[0], &target_addr, hp->h_length);
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hp->h_addr_list[1] = 0;
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} else
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hp = gethostbyname(host);
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if (hp == NULL || hp->h_length != sizeof(target_addr)) {
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fprintf(stderr, "mrinfo: %s: no such host\n", argv[0]);
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exit(1);
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}
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if (debug)
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fprintf(stderr, "Debug level %u\n", debug);
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/* Check all addresses; mrouters often have unreachable interfaces */
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for (curaddr = 0; hp->h_addr_list[curaddr] != NULL; curaddr++) {
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memcpy(&target_addr, hp->h_addr_list[curaddr], hp->h_length);
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{ /* Find a good local address for us. */
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int udp;
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struct sockaddr_in addr;
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int addrlen = sizeof(addr);
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addr.sin_family = AF_INET;
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#if (defined(BSD) && (BSD >= 199103))
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addr.sin_len = sizeof addr;
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#endif
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addr.sin_addr.s_addr = target_addr;
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addr.sin_port = htons(2000); /* any port over 1024 will
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* do... */
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if ((udp = socket(AF_INET, SOCK_DGRAM, 0)) < 0
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|| connect(udp, (struct sockaddr *) & addr, sizeof(addr)) < 0
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|| getsockname(udp, (struct sockaddr *) & addr, &addrlen) < 0) {
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perror("Determining local address");
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exit(-1);
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}
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close(udp);
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our_addr = addr.sin_addr.s_addr;
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}
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tries = 0;
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trynew = 1;
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/*
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* New strategy: send 'ask2' for two timeouts, then fall back
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* to 'ask', since it's not very likely that we are going to
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* find someone who only responds to 'ask' these days
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*/
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ask2(target_addr);
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gettimeofday(&et, 0);
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et.tv_sec += timeout;
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/* Main receive loop */
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for (;;) {
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fd_set fds;
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struct timeval tv, now;
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int count, recvlen, dummy = 0;
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register u_int32 src, dst, group;
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struct ip *ip;
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struct igmp *igmp;
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int ipdatalen, iphdrlen, igmpdatalen;
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FD_ZERO(&fds);
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FD_SET(igmp_socket, &fds);
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gettimeofday(&now, 0);
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tv.tv_sec = et.tv_sec - now.tv_sec;
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tv.tv_usec = et.tv_usec - now.tv_usec;
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if (tv.tv_usec < 0) {
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tv.tv_usec += 1000000L;
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--tv.tv_sec;
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}
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if (tv.tv_sec < 0)
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tv.tv_sec = tv.tv_usec = 0;
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count = select(igmp_socket + 1, &fds, 0, 0, &tv);
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if (count < 0) {
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if (errno != EINTR)
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perror("select");
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continue;
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} else if (count == 0) {
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log(LOG_DEBUG, 0, "Timed out receiving neighbor lists");
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if (++tries > retries)
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break;
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/* If we've tried ASK_NEIGHBORS2 twice with
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* no response, fall back to ASK_NEIGHBORS
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*/
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if (tries == 2 && target_level == 0)
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trynew = 0;
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if (target_level == 0 && trynew == 0)
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ask(target_addr);
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else
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ask2(target_addr);
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gettimeofday(&et, 0);
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et.tv_sec += timeout;
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continue;
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}
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recvlen = recvfrom(igmp_socket, recv_buf, RECV_BUF_SIZE,
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0, NULL, &dummy);
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if (recvlen <= 0) {
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if (recvlen && errno != EINTR)
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perror("recvfrom");
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continue;
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}
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if (recvlen < sizeof(struct ip)) {
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log(LOG_WARNING, 0,
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"packet too short (%u bytes) for IP header",
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recvlen);
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continue;
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}
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ip = (struct ip *) recv_buf;
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if (ip->ip_p == 0)
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continue; /* Request to install cache entry */
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src = ip->ip_src.s_addr;
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dst = ip->ip_dst.s_addr;
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iphdrlen = ip->ip_hl << 2;
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ipdatalen = ip->ip_len;
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if (iphdrlen + ipdatalen != recvlen) {
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log(LOG_WARNING, 0,
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"packet shorter (%u bytes) than hdr+data length (%u+%u)",
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recvlen, iphdrlen, ipdatalen);
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continue;
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}
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igmp = (struct igmp *) (recv_buf + iphdrlen);
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group = igmp->igmp_group.s_addr;
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igmpdatalen = ipdatalen - IGMP_MINLEN;
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if (igmpdatalen < 0) {
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log(LOG_WARNING, 0,
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"IP data field too short (%u bytes) for IGMP, from %s",
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ipdatalen, inet_fmt(src, s1));
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continue;
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}
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if (igmp->igmp_type != IGMP_DVMRP)
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continue;
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|
|
switch (igmp->igmp_code) {
|
|
case DVMRP_NEIGHBORS:
|
|
case DVMRP_NEIGHBORS2:
|
|
if (src != target_addr) {
|
|
fprintf(stderr, "mrinfo: got reply from %s",
|
|
inet_fmt(src, s1));
|
|
fprintf(stderr, " instead of %s\n",
|
|
inet_fmt(target_addr, s1));
|
|
/*continue;*/
|
|
}
|
|
break;
|
|
default:
|
|
continue; /* ignore all other DVMRP messages */
|
|
}
|
|
|
|
switch (igmp->igmp_code) {
|
|
|
|
case DVMRP_NEIGHBORS:
|
|
if (group) {
|
|
/* knows about DVMRP_NEIGHBORS2 msg */
|
|
if (target_level == 0) {
|
|
target_level = ntohl(group);
|
|
ask2(target_addr);
|
|
}
|
|
} else {
|
|
accept_neighbors(src, dst, (u_char *)(igmp + 1),
|
|
igmpdatalen, ntohl(group));
|
|
exit(0);
|
|
}
|
|
break;
|
|
|
|
case DVMRP_NEIGHBORS2:
|
|
accept_neighbors2(src, dst, (u_char *)(igmp + 1),
|
|
igmpdatalen, ntohl(group));
|
|
exit(0);
|
|
}
|
|
}
|
|
}
|
|
exit(1);
|
|
}
|
|
|
|
/* dummies */
|
|
void accept_probe(src, dst, p, datalen, level)
|
|
u_int32 src, dst, level;
|
|
char *p;
|
|
int datalen;
|
|
{
|
|
}
|
|
void accept_group_report(src, dst, group, r_type)
|
|
u_int32 src, dst, group;
|
|
int r_type;
|
|
{
|
|
}
|
|
void accept_neighbor_request2(src, dst)
|
|
u_int32 src, dst;
|
|
{
|
|
}
|
|
void accept_report(src, dst, p, datalen, level)
|
|
u_int32 src, dst, level;
|
|
char *p;
|
|
int datalen;
|
|
{
|
|
}
|
|
void accept_neighbor_request(src, dst)
|
|
u_int32 src, dst;
|
|
{
|
|
}
|
|
void accept_prune(src, dst, p, datalen)
|
|
u_int32 src, dst;
|
|
char *p;
|
|
int datalen;
|
|
{
|
|
}
|
|
void accept_graft(src, dst, p, datalen)
|
|
u_int32 src, dst;
|
|
char *p;
|
|
int datalen;
|
|
{
|
|
}
|
|
void accept_g_ack(src, dst, p, datalen)
|
|
u_int32 src, dst;
|
|
char *p;
|
|
int datalen;
|
|
{
|
|
}
|
|
void add_table_entry(origin, mcastgrp)
|
|
u_int32 origin, mcastgrp;
|
|
{
|
|
}
|
|
void check_vif_state()
|
|
{
|
|
}
|
|
void accept_leave_message(src, dst, group)
|
|
u_int32 src, dst, group;
|
|
{
|
|
}
|
|
void accept_mtrace(src, dst, group, data, no, datalen)
|
|
u_int32 src, dst, group;
|
|
char *data;
|
|
u_int no;
|
|
int datalen;
|
|
{
|
|
}
|
|
void accept_membership_query(src, dst, group, tmo)
|
|
u_int32 src, dst, group;
|
|
int tmo;
|
|
{
|
|
}
|
|
void accept_info_request(src, dst, p, datalen)
|
|
u_int32 src, dst;
|
|
u_char *p;
|
|
int datalen;
|
|
{
|
|
}
|
|
void accept_info_reply(src, dst, p, datalen)
|
|
u_int32 src, dst;
|
|
u_char *p;
|
|
int datalen;
|
|
{
|
|
}
|