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- /* ARP packet tracing routines
- * Copyright 1991 Phil Karn, KA9Q
- */
- #include <stdio.h>
- #include "global.h"
- #include "mbuf.h"
- #include "arp.h"
- #include "netuser.h"
- #include "trace.h"
-
- void
- arp_dump(fp,bpp)
- FILE *fp;
- struct mbuf **bpp;
- {
- struct arp arp;
- struct arp_type *at;
- int is_ip = 0;
- char tmp[25];
-
- if(bpp == NULLBUFP || *bpp == NULLBUF)
- return;
- fprintf(fp,"ARP: len %d",len_p(*bpp));
- if(ntoharp(&arp,bpp) == -1){
- fprintf(fp," bad packet\n");
- return;
- }
- if(arp.hardware < NHWTYPES)
- at = &Arp_type[arp.hardware];
- else
- at = NULLATYPE;
-
- /* Print hardware type in Ascii if known, numerically if not */
- fprintf(fp," hwtype %s",smsg(Arptypes,NHWTYPES,arp.hardware));
-
- /* Print hardware length only if unknown type, or if it doesn't match
- * the length in the known types table
- */
- if(at == NULLATYPE || arp.hwalen != at->hwalen)
- fprintf(fp," hwlen %u",arp.hwalen);
-
- /* Check for most common case -- upper level protocol is IP */
- if(at != NULLATYPE && arp.protocol == at->iptype){
- fprintf(fp," prot IP");
- is_ip = 1;
- } else {
- fprintf(fp," prot 0x%x prlen %u",arp.protocol,arp.pralen);
- }
- switch(arp.opcode){
- case ARP_REQUEST:
- fprintf(fp," op REQUEST");
- break;
- case ARP_REPLY:
- fprintf(fp," op REPLY");
- break;
- case REVARP_REQUEST:
- fprintf(fp," op REVERSE REQUEST");
- break;
- case REVARP_REPLY:
- fprintf(fp," op REVERSE REPLY");
- break;
- default:
- fprintf(fp," op %u",arp.opcode);
- break;
- }
- fprintf(fp,"\n");
- fprintf(fp,"sender");
- if(is_ip)
- fprintf(fp," IPaddr %s",inet_ntoa(arp.sprotaddr));
- fprintf(fp," hwaddr %s\n",at->format(tmp,arp.shwaddr));
-
- fprintf(fp,"target");
- if(is_ip)
- fprintf(fp," IPaddr %s",inet_ntoa(arp.tprotaddr));
- fprintf(fp," hwaddr %s\n",at->format(tmp,arp.thwaddr));
- }
-