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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/errno.h>
#include <setjmp.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#include <netdb.h>
#include <net/if_types.h>
#include "snoop.h"
extern char *dlc_header;
extern jmp_buf xdr_err;
static char *printip(unsigned char *);
static char *addrtoname_align(unsigned char *);
static char unarp_addr[] = "Unknown";
char *opname[] = {
"",
"ARP Request",
"ARP Reply",
"REVARP Request",
"REVARP Reply",
};
void
interpret_arp(int flags, struct arphdr *ap, int alen)
{
char *line;
extern char *src_name, *dst_name;
unsigned char *sip, *tip, *sha, *tha;
char *smacbuf = NULL, *dmacbuf = NULL;
int maclen;
ushort_t arpop;
boolean_t is_ip = B_FALSE;
/*
* Check that at least the generic ARP header was received.
*/
if (sizeof (struct arphdr) > alen)
goto short_packet;
arpop = ntohs(ap->ar_op);
maclen = ap->ar_hln;
if (ntohs(ap->ar_pro) == ETHERTYPE_IP)
is_ip = B_TRUE;
sha = (unsigned char *)(ap + 1);
sip = sha + maclen;
tha = sip + ap->ar_pln;
tip = tha + maclen;
/*
* Check that the protocol/hardware addresses were received.
*/
if ((tip + ap->ar_pln) > ((unsigned char *)ap + alen))
goto short_packet;
if (maclen == 0) {
smacbuf = dmacbuf = unarp_addr;
} else {
if (((flags & F_DTAIL) && is_ip) || (arpop == ARPOP_REPLY)) {
smacbuf = _link_ntoa(sha, NULL, maclen, IFT_OTHER);
if (smacbuf == NULL)
pr_err("Warning: malloc failure");
}
if (((flags & F_DTAIL) && is_ip) || (arpop ==
REVARP_REQUEST) || (arpop == REVARP_REPLY)) {
dmacbuf = _link_ntoa(tha, NULL, maclen, IFT_OTHER);
if (dmacbuf == NULL)
pr_err("Warning: malloc failure");
}
}
src_name = addrtoname_align(sip);
if (flags & F_SUM) {
line = get_sum_line();
switch (arpop) {
case ARPOP_REQUEST:
(void) snprintf(line, MAXLINE, "ARP C Who is %s ?",
printip(tip));
break;
case ARPOP_REPLY:
(void) snprintf(line, MAXLINE, "ARP R %s is %s",
printip(sip), smacbuf);
dst_name = addrtoname_align(tip);
break;
case REVARP_REQUEST:
(void) snprintf(line, MAXLINE, "RARP C Who is %s ?",
dmacbuf);
break;
case REVARP_REPLY:
(void) snprintf(line, MAXLINE, "RARP R %s is %s",
dmacbuf, printip(tip));
dst_name = addrtoname_align(tip);
break;
}
}
if (flags & F_DTAIL) {
show_header("ARP: ", "ARP/RARP Frame", alen);
show_space();
(void) snprintf(get_line(0, 0), get_line_remain(),
"Hardware type = %d (%s)", ntohs(ap->ar_hrd),
arp_htype(ntohs(ap->ar_hrd)));
(void) snprintf(get_line(0, 0), get_line_remain(),
"Protocol type = %04x (%s)", ntohs(ap->ar_pro),
print_ethertype(ntohs(ap->ar_pro)));
(void) snprintf(get_line(0, 0), get_line_remain(),
"Length of hardware address = %d bytes", ap->ar_hln);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Length of protocol address = %d bytes", ap->ar_pln);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Opcode %d (%s)", arpop,
(arpop > REVARP_REPLY) ? opname[0] : opname[arpop]);
if (is_ip) {
(void) snprintf(get_line(0, 0), get_line_remain(),
"Sender's hardware address = %s", smacbuf);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Sender's protocol address = %s",
printip(sip));
(void) snprintf(get_line(0, 0), get_line_remain(),
"Target hardware address = %s",
arpop == ARPOP_REQUEST ? "?" : dmacbuf);
(void) snprintf(get_line(0, 0), get_line_remain(),
"Target protocol address = %s",
arpop == REVARP_REQUEST ? "?" :
printip(tip));
}
show_trailer();
}
if (maclen != 0) {
free(smacbuf);
free(dmacbuf);
}
return;
short_packet:
if (flags & F_SUM) {
(void) snprintf(get_sum_line(), MAXLINE,
"ARP (short packet)");
} else if (flags & F_DTAIL) {
show_header("ARP: ", "ARP/RARP Frame", alen);
show_space();
(void) snprintf(get_line(0, 0), get_line_remain(),
"ARP (short packet)");
}
}
char *
printip(unsigned char *p)
{
static char buff[MAXHOSTNAMELEN + 32];
char *ap, *np;
struct in_addr a;
memcpy(&a, p, 4);
ap = (char *)inet_ntoa(a);
np = (char *)addrtoname(AF_INET, &a);
(void) snprintf(buff, MAXHOSTNAMELEN, "%s, %s", ap, np);
return (buff);
}
char *
addrtoname_align(unsigned char *p)
{
struct in_addr a;
memcpy(&a, p, 4);
return ((char *)addrtoname(AF_INET, &a));
}
/*
* These numbers are assigned by the IANA. See the arp-parameters registry.
* Only those values that are used within Solaris have #defines.
*/
const char *
arp_htype(int t)
{
switch (t) {
case ARPHRD_ETHER:
return ("Ethernet (10Mb)");
case 2:
return ("Experimental Ethernet (3MB)");
case 3:
return ("Amateur Radio AX.25");
case 4:
return ("Proteon ProNET Token Ring");
case 5:
return ("Chaos");
case ARPHRD_IEEE802:
return ("IEEE 802");
case 7:
return ("ARCNET");
case 8:
return ("Hyperchannel");
case 9:
return ("Lanstar");
case 10:
return ("Autonet");
case 11:
return ("LocalTalk");
case 12:
return ("LocalNet");
case 13:
return ("Ultra Link");
case 14:
return ("SMDS");
case ARPHRD_FRAME:
return ("Frame Relay");
case ARPHRD_ATM:
return ("ATM");
case ARPHRD_HDLC:
return ("HDLC");
case ARPHRD_FC:
return ("Fibre Channel");
case ARPHRD_IPATM:
return ("IP-ATM");
case ARPHRD_TUNNEL:
return ("Tunnel");
case ARPHRD_IB:
return ("IPIB");
};
return ("UNKNOWN");
}
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