*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.43 1999-10-07 23:47:11 mcr Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.64 2004-04-30 16:42:14 mcr Exp $ (LBL)";
#endif
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/socket.h>
-
-#if __STDC__
-struct mbuf;
-struct rtentry;
+#ifdef HAVE_CONFIG_H
+#include "config.h"
#endif
-#include <net/if.h>
-#include <netinet/in.h>
-#include <netinet/if_ether.h>
+#include <tcpdump-stdinc.h>
-#ifdef HAVE_MEMORY_H
-#include <memory.h>
-#endif
#include <stdio.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
+#include "ether.h"
#include "ethertype.h"
#include "extract.h" /* must come after interface.h */
-/* Compatibility */
-#ifndef REVARP_REQUEST
-#define REVARP_REQUEST 3
+/*
+ * Address Resolution Protocol.
+ *
+ * See RFC 826 for protocol description. ARP packets are variable
+ * in size; the arphdr structure defines the fixed-length portion.
+ * Protocol type values are the same as those for 10 Mb/s Ethernet.
+ * It is followed by the variable-sized fields ar_sha, arp_spa,
+ * arp_tha and arp_tpa in that order, according to the lengths
+ * specified. Field names used correspond to RFC 826.
+ */
+struct arp_pkthdr {
+ u_short ar_hrd; /* format of hardware address */
+#define ARPHRD_ETHER 1 /* ethernet hardware format */
+#define ARPHRD_IEEE802 6 /* token-ring hardware format */
+#define ARPHRD_ARCNET 7 /* arcnet hardware format */
+#define ARPHRD_FRELAY 15 /* frame relay hardware format */
+#define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
+#define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
+ u_short ar_pro; /* format of protocol address */
+ u_char ar_hln; /* length of hardware address */
+ u_char ar_pln; /* length of protocol address */
+ u_short ar_op; /* one of: */
+#define ARPOP_REQUEST 1 /* request to resolve address */
+#define ARPOP_REPLY 2 /* response to previous request */
+#define ARPOP_REVREQUEST 3 /* request protocol address given hardware */
+#define ARPOP_REVREPLY 4 /* response giving protocol address */
+#define ARPOP_INVREQUEST 8 /* request to identify peer */
+#define ARPOP_INVREPLY 9 /* response identifying peer */
+/*
+ * The remaining fields are variable in size,
+ * according to the sizes above.
+ */
+#ifdef COMMENT_ONLY
+ u_char ar_sha[]; /* sender hardware address */
+ u_char ar_spa[]; /* sender protocol address */
+ u_char ar_tha[]; /* target hardware address */
+ u_char ar_tpa[]; /* target protocol address */
#endif
-#ifndef REVARP_REPLY
-#define REVARP_REPLY 4
+#define ar_sha(ap) (((const u_char *)((ap)+1))+0)
+#define ar_spa(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln)
+#define ar_tha(ap) (((const u_char *)((ap)+1))+ (ap)->ar_hln+(ap)->ar_pln)
+#define ar_tpa(ap) (((const u_char *)((ap)+1))+2*(ap)->ar_hln+(ap)->ar_pln)
+};
+
+#define ARP_HDRLEN 8
+
+#define HRD(ap) EXTRACT_16BITS(&(ap)->ar_hrd)
+#define HLN(ap) ((ap)->ar_hln)
+#define PLN(ap) ((ap)->ar_pln)
+#define OP(ap) EXTRACT_16BITS(&(ap)->ar_op)
+#define PRO(ap) EXTRACT_16BITS(&(ap)->ar_pro)
+#define SHA(ap) (ar_sha(ap))
+#define SPA(ap) (ar_spa(ap))
+#define THA(ap) (ar_tha(ap))
+#define TPA(ap) (ar_tpa(ap))
+
+/*
+ * ATM Address Resolution Protocol.
+ *
+ * See RFC 2225 for protocol description. ATMARP packets are similar
+ * to ARP packets, except that there are no length fields for the
+ * protocol address - instead, there are type/length fields for
+ * the ATM number and subaddress - and the hardware addresses consist
+ * of an ATM number and an ATM subaddress.
+ */
+struct atmarp_pkthdr {
+ u_short aar_hrd; /* format of hardware address */
+#define ARPHRD_ATM2225 19 /* ATM (RFC 2225) */
+ u_short aar_pro; /* format of protocol address */
+ u_char aar_shtl; /* length of source ATM number */
+ u_char aar_sstl; /* length of source ATM subaddress */
+#define ATMARP_IS_E164 0x40 /* bit in type/length for E.164 format */
+#define ATMARP_LEN_MASK 0x3F /* length of {sub}address in type/length */
+ u_short aar_op; /* same as regular ARP */
+#define ATMARPOP_NAK 10 /* NAK */
+ u_char aar_spln; /* length of source protocol address */
+ u_char aar_thtl; /* length of target ATM number */
+ u_char aar_tstl; /* length of target ATM subaddress */
+ u_char aar_tpln; /* length of target protocol address */
+/*
+ * The remaining fields are variable in size,
+ * according to the sizes above.
+ */
+#ifdef COMMENT_ONLY
+ u_char aar_sha[]; /* source ATM number */
+ u_char aar_ssa[]; /* source ATM subaddress */
+ u_char aar_spa[]; /* sender protocol address */
+ u_char aar_tha[]; /* target ATM number */
+ u_char aar_tsa[]; /* target ATM subaddress */
+ u_char aar_tpa[]; /* target protocol address */
#endif
+#define ATMHRD(ap) EXTRACT_16BITS(&(ap)->aar_hrd)
+#define ATMSHLN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK)
+#define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK)
+#define ATMSPLN(ap) ((ap)->aar_spln)
+#define ATMOP(ap) EXTRACT_16BITS(&(ap)->aar_op)
+#define ATMPRO(ap) EXTRACT_16BITS(&(ap)->aar_pro)
+#define ATMTHLN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK)
+#define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK)
+#define ATMTPLN(ap) ((ap)->aar_tpln)
+#define aar_sha(ap) ((const u_char *)((ap)+1))
+#define aar_ssa(ap) (aar_sha(ap) + ATMSHLN(ap))
+#define aar_spa(ap) (aar_ssa(ap) + ATMSSLN(ap))
+#define aar_tha(ap) (aar_spa(ap) + ATMSPLN(ap))
+#define aar_tsa(ap) (aar_tha(ap) + ATMTHLN(ap))
+#define aar_tpa(ap) (aar_tsa(ap) + ATMTSLN(ap))
+};
+
+#define ATMSHA(ap) (aar_sha(ap))
+#define ATMSSA(ap) (aar_ssa(ap))
+#define ATMSPA(ap) (aar_spa(ap))
+#define ATMTHA(ap) (aar_tha(ap))
+#define ATMTSA(ap) (aar_tsa(ap))
+#define ATMTPA(ap) (aar_tpa(ap))
+
static u_char ezero[6];
-void
-arp_print(register const u_char *bp, u_int length, u_int caplen)
+static void
+atmarp_addr_print(netdissect_options *ndo,
+ const u_char *ha, u_int ha_len, const u_char *srca,
+ u_int srca_len)
+{
+ if (ha_len == 0)
+ ND_PRINT((ndo, "<No address>"));
+ else {
+ ND_PRINT((ndo, "%s", linkaddr_string(ha, ha_len)));
+ if (srca_len != 0)
+ ND_PRINT((ndo, ",%s",
+ linkaddr_string(srca, srca_len)));
+ }
+}
+
+static void
+atmarp_print(netdissect_options *ndo,
+ const u_char *bp, u_int length, u_int caplen)
{
- register const struct ether_arp *ap;
- register const struct ether_header *eh;
- register u_short pro, hrd, op;
+ const struct atmarp_pkthdr *ap;
+ u_short pro, hrd, op;
+
+ ap = (const struct atmarp_pkthdr *)bp;
+ ND_TCHECK(*ap);
+
+ hrd = ATMHRD(ap);
+ pro = ATMPRO(ap);
+ op = ATMOP(ap);
+
+ if (!ND_TTEST2(*aar_tpa(ap), ATMTPLN(ap))) {
+ ND_PRINT((ndo, "truncated-atmarp"));
+ ND_DEFAULTPRINT((const u_char *)ap, length);
+ return;
+ }
+
+ if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
+ ATMSPLN(ap) != 4 || ATMTPLN(ap) != 4) {
+ ND_PRINT((ndo, "atmarp-#%d for proto #%d (%d/%d) hardware #%d",
+ op, pro, ATMSPLN(ap), ATMTPLN(ap), hrd));
+ return;
+ }
+ if (pro == ETHERTYPE_TRAIL)
+ ND_PRINT((ndo, "trailer-"));
+ switch (op) {
+
+ case ARPOP_REQUEST:
+ ND_PRINT((ndo, "arp who-has %s", ipaddr_string(ATMTPA(ap))));
+ if (ATMTHLN(ap) != 0) {
+ ND_PRINT((ndo, " ("));
+ atmarp_addr_print(ndo, ATMTHA(ap), ATMTHLN(ap),
+ ATMTSA(ap), ATMTSLN(ap));
+ ND_PRINT((ndo, ")"));
+ }
+ ND_PRINT((ndo, " tell %s", ipaddr_string(ATMSPA(ap))));
+ break;
+
+ case ARPOP_REPLY:
+ ND_PRINT((ndo, "arp reply %s", ipaddr_string(ATMSPA(ap))));
+ ND_PRINT((ndo, " is-at "));
+ atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
+ ATMSSLN(ap));
+ break;
- ap = (struct ether_arp *)bp;
- if ((u_char *)(ap + 1) > snapend) {
- printf("[|arp]");
+ case ARPOP_INVREQUEST:
+ ND_PRINT((ndo, "invarp who-is "));
+ atmarp_addr_print(ndo, ATMTHA(ap), ATMTHLN(ap), ATMTSA(ap),
+ ATMTSLN(ap));
+ ND_PRINT((ndo, " tell "));
+ atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
+ ATMSSLN(ap));
+ break;
+
+ case ARPOP_INVREPLY:
+ ND_PRINT((ndo, "invarp reply "));
+ atmarp_addr_print(ndo, ATMSHA(ap), ATMSHLN(ap), ATMSSA(ap),
+ ATMSSLN(ap));
+ ND_PRINT((ndo, " at %s", ipaddr_string(ATMSPA(ap))));
+ break;
+
+ case ATMARPOP_NAK:
+ ND_PRINT((ndo, "nak reply for %s",
+ ipaddr_string(ATMSPA(ap))));
+ break;
+
+ default:
+ ND_PRINT((ndo, "atmarp-#%d", op));
+ ND_DEFAULTPRINT((const u_char *)ap, caplen);
return;
}
- if (length < sizeof(struct ether_arp)) {
- (void)printf("truncated-arp");
- default_print((u_char *)ap, length);
+ return;
+trunc:
+ ND_PRINT((ndo, "[|atmarp]"));
+}
+
+void
+arp_print(netdissect_options *ndo,
+ const u_char *bp, u_int length, u_int caplen)
+{
+ const struct arp_pkthdr *ap;
+ u_short pro, hrd, op;
+
+ ap = (const struct arp_pkthdr *)bp;
+ ND_TCHECK(*ap);
+ hrd = HRD(ap);
+ if (hrd == ARPHRD_ATM2225) {
+ atmarp_print(ndo, bp, length, caplen);
return;
}
+ pro = PRO(ap);
+ op = OP(ap);
- pro = EXTRACT_16BITS(&ap->arp_pro);
- hrd = EXTRACT_16BITS(&ap->arp_hrd);
- op = EXTRACT_16BITS(&ap->arp_op);
+ if (!ND_TTEST2(*ar_tpa(ap), PLN(ap))) {
+ ND_PRINT((ndo, "truncated-arp"));
+ ND_DEFAULTPRINT((const u_char *)ap, length);
+ return;
+ }
- if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
- || ap->arp_hln != sizeof(SHA(ap))
- || ap->arp_pln != sizeof(SPA(ap))) {
- (void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
- op, pro, ap->arp_pln,
- hrd, ap->arp_hln);
+ if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
+ PLN(ap) != 4 || HLN(ap) == 0) {
+ ND_PRINT((ndo, "arp-#%d for proto #%d (%d) hardware #%d (%d)",
+ op, pro, PLN(ap), hrd, HLN(ap)));
return;
}
if (pro == ETHERTYPE_TRAIL)
- (void)printf("trailer-");
- eh = (struct ether_header *)packetp;
+ ND_PRINT((ndo, "trailer-"));
switch (op) {
case ARPOP_REQUEST:
- (void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
- if (memcmp((char *)ezero, (char *)THA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(THA(ap)));
- (void)printf(" tell %s", ipaddr_string(SPA(ap)));
- if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(SHA(ap)));
+ ND_PRINT((ndo, "arp who-has %s", ipaddr_string(TPA(ap))));
+ if (memcmp((const char *)ezero, (const char *)THA(ap), HLN(ap)) != 0)
+ ND_PRINT((ndo, " (%s)",
+ linkaddr_string(THA(ap), HLN(ap))));
+ ND_PRINT((ndo, " tell %s", ipaddr_string(SPA(ap))));
break;
case ARPOP_REPLY:
- (void)printf("arp reply %s", ipaddr_string(SPA(ap)));
- if (memcmp((char *)ESRC(eh), (char *)SHA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(SHA(ap)));
- (void)printf(" is-at %s", etheraddr_string(SHA(ap)));
- if (memcmp((char *)EDST(eh), (char *)THA(ap), 6) != 0)
- (void)printf(" (%s)", etheraddr_string(THA(ap)));
+ ND_PRINT((ndo, "arp reply %s", ipaddr_string(SPA(ap))));
+ ND_PRINT((ndo, " is-at %s", linkaddr_string(SHA(ap), HLN(ap))));
break;
- case REVARP_REQUEST:
- (void)printf("rarp who-is %s tell %s",
- etheraddr_string(THA(ap)),
- etheraddr_string(SHA(ap)));
+ case ARPOP_REVREQUEST:
+ ND_PRINT((ndo, "rarp who-is %s tell %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ linkaddr_string(SHA(ap), HLN(ap))));
break;
- case REVARP_REPLY:
- (void)printf("rarp reply %s at %s",
- etheraddr_string(THA(ap)),
- ipaddr_string(TPA(ap)));
+ case ARPOP_REVREPLY:
+ ND_PRINT((ndo, "rarp reply %s at %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ ipaddr_string(TPA(ap))));
+ break;
+
+ case ARPOP_INVREQUEST:
+ ND_PRINT((ndo, "invarp who-is %s tell %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ linkaddr_string(SHA(ap), HLN(ap))));
+ break;
+
+ case ARPOP_INVREPLY:
+ ND_PRINT((ndo,"invarp reply %s at %s",
+ linkaddr_string(THA(ap), HLN(ap)),
+ ipaddr_string(TPA(ap))));
break;
default:
- (void)printf("arp-#%d", op);
- default_print((u_char *)ap, caplen);
+ ND_PRINT((ndo, "arp-#%d", op));
+ ND_DEFAULTPRINT((const u_char *)ap, caplen);
return;
}
if (hrd != ARPHRD_ETHER)
- printf(" hardware #%d", hrd);
+ ND_PRINT((ndo, " hardware #%d", hrd));
+ return;
+trunc:
+ ND_PRINT((ndo, "[|arp]"));
}
+
+/*
+ * Local Variables:
+ * c-style: bsd
+ * End:
+ */
+
projects / tcpdump / blobdiff