1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * CDDL HEADER START 3*0Sstevel@tonic-gate * 4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*0Sstevel@tonic-gate * with the License. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*0Sstevel@tonic-gate * See the License for the specific language governing permissions 12*0Sstevel@tonic-gate * and limitations under the License. 13*0Sstevel@tonic-gate * 14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*0Sstevel@tonic-gate * 20*0Sstevel@tonic-gate * CDDL HEADER END 21*0Sstevel@tonic-gate */ 22*0Sstevel@tonic-gate /* 23*0Sstevel@tonic-gate * Copyright 1991-2001, 2003 Sun Microsystems, Inc. All rights reserved. 24*0Sstevel@tonic-gate * Use is subject to license terms. 25*0Sstevel@tonic-gate */ 26*0Sstevel@tonic-gate 27*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*0Sstevel@tonic-gate 29*0Sstevel@tonic-gate #include <sys/types.h> 30*0Sstevel@tonic-gate #include <sys/errno.h> 31*0Sstevel@tonic-gate #include <setjmp.h> 32*0Sstevel@tonic-gate #include <sys/socket.h> 33*0Sstevel@tonic-gate #include <net/if.h> 34*0Sstevel@tonic-gate #include <net/if_arp.h> 35*0Sstevel@tonic-gate #include <netinet/in_systm.h> 36*0Sstevel@tonic-gate #include <netinet/in.h> 37*0Sstevel@tonic-gate #include <netinet/ip.h> 38*0Sstevel@tonic-gate #include <netinet/if_ether.h> 39*0Sstevel@tonic-gate #include <netdb.h> 40*0Sstevel@tonic-gate #include <net/if_types.h> 41*0Sstevel@tonic-gate 42*0Sstevel@tonic-gate #include "snoop.h" 43*0Sstevel@tonic-gate 44*0Sstevel@tonic-gate extern char *dlc_header; 45*0Sstevel@tonic-gate extern jmp_buf xdr_err; 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate static char *printip(unsigned char *); 48*0Sstevel@tonic-gate static char *addrtoname_align(unsigned char *); 49*0Sstevel@tonic-gate 50*0Sstevel@tonic-gate static char unarp_addr[] = "Unknown"; 51*0Sstevel@tonic-gate char *opname[] = { 52*0Sstevel@tonic-gate "", 53*0Sstevel@tonic-gate "ARP Request", 54*0Sstevel@tonic-gate "ARP Reply", 55*0Sstevel@tonic-gate "REVARP Request", 56*0Sstevel@tonic-gate "REVARP Reply", 57*0Sstevel@tonic-gate }; 58*0Sstevel@tonic-gate 59*0Sstevel@tonic-gate void 60*0Sstevel@tonic-gate interpret_arp(int flags, struct arphdr *ap, int alen) 61*0Sstevel@tonic-gate { 62*0Sstevel@tonic-gate char *line; 63*0Sstevel@tonic-gate extern char *src_name, *dst_name; 64*0Sstevel@tonic-gate unsigned char *sip, *tip, *sha, *tha; 65*0Sstevel@tonic-gate char *smacbuf = NULL, *dmacbuf = NULL; 66*0Sstevel@tonic-gate int maclen; 67*0Sstevel@tonic-gate ushort_t arpop; 68*0Sstevel@tonic-gate boolean_t is_ip = B_FALSE; 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate /* 71*0Sstevel@tonic-gate * Check that at least the generic ARP header was received. 72*0Sstevel@tonic-gate */ 73*0Sstevel@tonic-gate if (sizeof (struct arphdr) > alen) 74*0Sstevel@tonic-gate goto short_packet; 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate arpop = ntohs(ap->ar_op); 77*0Sstevel@tonic-gate maclen = ap->ar_hln; 78*0Sstevel@tonic-gate if (ntohs(ap->ar_pro) == ETHERTYPE_IP) 79*0Sstevel@tonic-gate is_ip = B_TRUE; 80*0Sstevel@tonic-gate 81*0Sstevel@tonic-gate sha = (unsigned char *)(ap + 1); 82*0Sstevel@tonic-gate sip = sha + maclen; 83*0Sstevel@tonic-gate tha = sip + ap->ar_pln; 84*0Sstevel@tonic-gate tip = tha + maclen; 85*0Sstevel@tonic-gate 86*0Sstevel@tonic-gate /* 87*0Sstevel@tonic-gate * Check that the protocol/hardware addresses were received. 88*0Sstevel@tonic-gate */ 89*0Sstevel@tonic-gate if ((tip + ap->ar_pln) > ((unsigned char *)ap + alen)) 90*0Sstevel@tonic-gate goto short_packet; 91*0Sstevel@tonic-gate 92*0Sstevel@tonic-gate if (maclen == 0) { 93*0Sstevel@tonic-gate smacbuf = dmacbuf = unarp_addr; 94*0Sstevel@tonic-gate } else { 95*0Sstevel@tonic-gate if (((flags & F_DTAIL) && is_ip) || (arpop == ARPOP_REPLY)) { 96*0Sstevel@tonic-gate smacbuf = _link_ntoa(sha, NULL, maclen, IFT_OTHER); 97*0Sstevel@tonic-gate if (smacbuf == NULL) 98*0Sstevel@tonic-gate pr_err("Warning: malloc failure"); 99*0Sstevel@tonic-gate } 100*0Sstevel@tonic-gate 101*0Sstevel@tonic-gate if (((flags & F_DTAIL) && is_ip) || (arpop == 102*0Sstevel@tonic-gate REVARP_REQUEST) || (arpop == REVARP_REPLY)) { 103*0Sstevel@tonic-gate dmacbuf = _link_ntoa(tha, NULL, maclen, IFT_OTHER); 104*0Sstevel@tonic-gate if (dmacbuf == NULL) 105*0Sstevel@tonic-gate pr_err("Warning: malloc failure"); 106*0Sstevel@tonic-gate } 107*0Sstevel@tonic-gate } 108*0Sstevel@tonic-gate 109*0Sstevel@tonic-gate src_name = addrtoname_align(sip); 110*0Sstevel@tonic-gate 111*0Sstevel@tonic-gate if (flags & F_SUM) { 112*0Sstevel@tonic-gate 113*0Sstevel@tonic-gate line = get_sum_line(); 114*0Sstevel@tonic-gate 115*0Sstevel@tonic-gate switch (arpop) { 116*0Sstevel@tonic-gate case ARPOP_REQUEST: 117*0Sstevel@tonic-gate (void) snprintf(line, MAXLINE, "ARP C Who is %s ?", 118*0Sstevel@tonic-gate printip(tip)); 119*0Sstevel@tonic-gate break; 120*0Sstevel@tonic-gate case ARPOP_REPLY: 121*0Sstevel@tonic-gate (void) snprintf(line, MAXLINE, "ARP R %s is %s", 122*0Sstevel@tonic-gate printip(sip), smacbuf); 123*0Sstevel@tonic-gate dst_name = addrtoname_align(tip); 124*0Sstevel@tonic-gate break; 125*0Sstevel@tonic-gate case REVARP_REQUEST: 126*0Sstevel@tonic-gate (void) snprintf(line, MAXLINE, "RARP C Who is %s ?", 127*0Sstevel@tonic-gate dmacbuf); 128*0Sstevel@tonic-gate break; 129*0Sstevel@tonic-gate case REVARP_REPLY: 130*0Sstevel@tonic-gate (void) snprintf(line, MAXLINE, "RARP R %s is %s", 131*0Sstevel@tonic-gate dmacbuf, printip(tip)); 132*0Sstevel@tonic-gate dst_name = addrtoname_align(tip); 133*0Sstevel@tonic-gate break; 134*0Sstevel@tonic-gate } 135*0Sstevel@tonic-gate } 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate if (flags & F_DTAIL) { 138*0Sstevel@tonic-gate show_header("ARP: ", "ARP/RARP Frame", alen); 139*0Sstevel@tonic-gate show_space(); 140*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 141*0Sstevel@tonic-gate "Hardware type = %d", ntohs(ap->ar_hrd)); 142*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 143*0Sstevel@tonic-gate "Protocol type = %04x (%s)", ntohs(ap->ar_pro), 144*0Sstevel@tonic-gate print_ethertype(ntohs(ap->ar_pro))); 145*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 146*0Sstevel@tonic-gate "Length of hardware address = %d bytes", ap->ar_hln); 147*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 148*0Sstevel@tonic-gate "Length of protocol address = %d bytes", ap->ar_pln); 149*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 150*0Sstevel@tonic-gate "Opcode %d (%s)", arpop, 151*0Sstevel@tonic-gate (arpop > REVARP_REPLY) ? opname[0] : opname[arpop]); 152*0Sstevel@tonic-gate 153*0Sstevel@tonic-gate if (is_ip) { 154*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 155*0Sstevel@tonic-gate "Sender's hardware address = %s", smacbuf); 156*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 157*0Sstevel@tonic-gate "Sender's protocol address = %s", 158*0Sstevel@tonic-gate printip(sip)); 159*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 160*0Sstevel@tonic-gate "Target hardware address = %s", 161*0Sstevel@tonic-gate arpop == ARPOP_REQUEST ? "?" : dmacbuf); 162*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 163*0Sstevel@tonic-gate "Target protocol address = %s", 164*0Sstevel@tonic-gate arpop == REVARP_REQUEST ? "?" : 165*0Sstevel@tonic-gate printip(tip)); 166*0Sstevel@tonic-gate } 167*0Sstevel@tonic-gate show_trailer(); 168*0Sstevel@tonic-gate } 169*0Sstevel@tonic-gate 170*0Sstevel@tonic-gate if (maclen != 0) { 171*0Sstevel@tonic-gate free(smacbuf); 172*0Sstevel@tonic-gate free(dmacbuf); 173*0Sstevel@tonic-gate } 174*0Sstevel@tonic-gate return; 175*0Sstevel@tonic-gate 176*0Sstevel@tonic-gate short_packet: 177*0Sstevel@tonic-gate if (flags & F_SUM) { 178*0Sstevel@tonic-gate (void) snprintf(get_sum_line(), MAXLINE, 179*0Sstevel@tonic-gate "ARP (short packet)"); 180*0Sstevel@tonic-gate } else if (flags & F_DTAIL) { 181*0Sstevel@tonic-gate show_header("ARP: ", "ARP/RARP Frame", alen); 182*0Sstevel@tonic-gate show_space(); 183*0Sstevel@tonic-gate (void) snprintf(get_line(0, 0), get_line_remain(), 184*0Sstevel@tonic-gate "ARP (short packet)"); 185*0Sstevel@tonic-gate } 186*0Sstevel@tonic-gate } 187*0Sstevel@tonic-gate 188*0Sstevel@tonic-gate char * 189*0Sstevel@tonic-gate printip(unsigned char *p) 190*0Sstevel@tonic-gate { 191*0Sstevel@tonic-gate static char buff[MAXHOSTNAMELEN + 32]; 192*0Sstevel@tonic-gate char *ap, *np; 193*0Sstevel@tonic-gate struct in_addr a; 194*0Sstevel@tonic-gate 195*0Sstevel@tonic-gate memcpy(&a, p, 4); 196*0Sstevel@tonic-gate ap = (char *)inet_ntoa(a); 197*0Sstevel@tonic-gate np = (char *)addrtoname(AF_INET, &a); 198*0Sstevel@tonic-gate (void) snprintf(buff, MAXHOSTNAMELEN, "%s, %s", ap, np); 199*0Sstevel@tonic-gate return (buff); 200*0Sstevel@tonic-gate } 201*0Sstevel@tonic-gate 202*0Sstevel@tonic-gate char * 203*0Sstevel@tonic-gate addrtoname_align(unsigned char *p) 204*0Sstevel@tonic-gate { 205*0Sstevel@tonic-gate struct in_addr a; 206*0Sstevel@tonic-gate 207*0Sstevel@tonic-gate memcpy(&a, p, 4); 208*0Sstevel@tonic-gate return ((char *)addrtoname(AF_INET, &a)); 209*0Sstevel@tonic-gate } 210