* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.53 2002-04-25 04:37:31 guy Exp $ (LBL)";
-#endif
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+/* \summary: Address Resolution Protocol (ARP) printer */
-#include <sys/param.h>
-#include <sys/time.h>
+#include <config.h>
-#include <netinet/in.h>
+#include "netdissect-stdinc.h"
-#include <stdio.h>
-#include <string.h>
-
-#include "interface.h"
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
#include "addrtoname.h"
-#include "ether.h"
#include "ethertype.h"
-#include "extract.h" /* must come after interface.h */
+#include "extract.h"
+
/*
* Address Resolution Protocol.
* 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 */
+struct arp_pkthdr {
+ nd_uint16_t 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_ATM2225 19 /* ATM (RFC 2225) */
+#define ARPHRD_STRIP 23 /* Ricochet Starmode Radio hardware format */
+#define ARPHRD_IEEE1394 24 /* IEEE 1394 (FireWire) hardware format */
+#define ARPHRD_INFINIBAND 32 /* InfiniBand RFC 4391 */
+ nd_uint16_t ar_pro; /* format of protocol address */
+ nd_uint8_t ar_hln; /* length of hardware address */
+ nd_uint8_t ar_pln; /* length of protocol address */
+ nd_uint16_t 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 */
+#define ARPOP_NAK 10 /* NAK - only valid for ATM ARP */
+
/*
* 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 */
+ nd_byte ar_sha[]; /* sender hardware address */
+ nd_byte ar_spa[]; /* sender protocol address */
+ nd_byte ar_tha[]; /* target hardware address */
+ nd_byte ar_tpa[]; /* target protocol address */
#endif
-#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 ar_sha(ap) (((const u_char *)((ap)+1))+ 0)
+#define ar_spa(ap) (((const u_char *)((ap)+1))+ GET_U_1((ap)->ar_hln))
+#define ar_tha(ap) (((const u_char *)((ap)+1))+ GET_U_1((ap)->ar_hln)+GET_U_1((ap)->ar_pln))
+#define ar_tpa(ap) (((const u_char *)((ap)+1))+2*GET_U_1((ap)->ar_hln)+GET_U_1((ap)->ar_pln))
};
#define ARP_HDRLEN 8
-#define HRD(ap) ((ap)->ar_hrd)
-#define HLN(ap) ((ap)->ar_hln)
-#define PLN(ap) ((ap)->ar_pln)
-#define OP(ap) ((ap)->ar_op)
-#define PRO(ap) ((ap)->ar_pro)
+#define HRD(ap) GET_BE_U_2((ap)->ar_hrd)
+#define HRD_LEN(ap) GET_U_1((ap)->ar_hln)
+#define PROTO_LEN(ap) GET_U_1((ap)->ar_pln)
+#define OP(ap) GET_BE_U_2((ap)->ar_op)
+#define PRO(ap) GET_BE_U_2((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))
-static u_char ezero[6];
+
+static const struct tok arpop_values[] = {
+ { ARPOP_REQUEST, "Request" },
+ { ARPOP_REPLY, "Reply" },
+ { ARPOP_REVREQUEST, "Reverse Request" },
+ { ARPOP_REVREPLY, "Reverse Reply" },
+ { ARPOP_INVREQUEST, "Inverse Request" },
+ { ARPOP_INVREPLY, "Inverse Reply" },
+ { ARPOP_NAK, "NACK Reply" },
+ { 0, NULL }
+};
+
+static const struct tok arphrd_values[] = {
+ { ARPHRD_ETHER, "Ethernet" },
+ { ARPHRD_IEEE802, "TokenRing" },
+ { ARPHRD_ARCNET, "ArcNet" },
+ { ARPHRD_FRELAY, "FrameRelay" },
+ { ARPHRD_STRIP, "Strip" },
+ { ARPHRD_IEEE1394, "IEEE 1394" },
+ { ARPHRD_ATM2225, "ATM" },
+ { ARPHRD_INFINIBAND, "InfiniBand" },
+ { 0, NULL }
+};
+
+/*
+ * 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 {
+ nd_uint16_t aar_hrd; /* format of hardware address */
+ nd_uint16_t aar_pro; /* format of protocol address */
+ nd_uint8_t aar_shtl; /* length of source ATM number */
+ nd_uint8_t 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 */
+ nd_uint16_t aar_op; /* same as regular ARP */
+ nd_uint8_t aar_spln; /* length of source protocol address */
+ nd_uint8_t aar_thtl; /* length of target ATM number */
+ nd_uint8_t aar_tstl; /* length of target ATM subaddress */
+ nd_uint8_t aar_tpln; /* length of target protocol address */
+/*
+ * The remaining fields are variable in size,
+ * according to the sizes above.
+ */
+#ifdef COMMENT_ONLY
+ nd_byte aar_sha[]; /* source ATM number */
+ nd_byte aar_ssa[]; /* source ATM subaddress */
+ nd_byte aar_spa[]; /* sender protocol address */
+ nd_byte aar_tha[]; /* target ATM number */
+ nd_byte aar_tsa[]; /* target ATM subaddress */
+ nd_byte aar_tpa[]; /* target protocol address */
+#endif
+
+#define ATMHRD(ap) GET_BE_U_2((ap)->aar_hrd)
+#define ATMSHRD_LEN(ap) (GET_U_1((ap)->aar_shtl) & ATMARP_LEN_MASK)
+#define ATMSSLN(ap) (GET_U_1((ap)->aar_sstl) & ATMARP_LEN_MASK)
+#define ATMSPROTO_LEN(ap) GET_U_1((ap)->aar_spln)
+#define ATMOP(ap) GET_BE_U_2((ap)->aar_op)
+#define ATMPRO(ap) GET_BE_U_2((ap)->aar_pro)
+#define ATMTHRD_LEN(ap) (GET_U_1((ap)->aar_thtl) & ATMARP_LEN_MASK)
+#define ATMTSLN(ap) (GET_U_1((ap)->aar_tstl) & ATMARP_LEN_MASK)
+#define ATMTPROTO_LEN(ap) GET_U_1((ap)->aar_tpln)
+#define aar_sha(ap) ((const u_char *)((ap)+1))
+#define aar_ssa(ap) (aar_sha(ap) + ATMSHRD_LEN(ap))
+#define aar_spa(ap) (aar_ssa(ap) + ATMSSLN(ap))
+#define aar_tha(ap) (aar_spa(ap) + ATMSPROTO_LEN(ap))
+#define aar_tsa(ap) (aar_tha(ap) + ATMTHRD_LEN(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 int
+isnonzero(netdissect_options *ndo, const u_char *a, size_t len)
+{
+ while (len != 0) {
+ if (GET_U_1(a) != 0)
+ return (1);
+ a++;
+ len--;
+ }
+ return (0);
+}
+
+static void
+tpaddr_print_ip(netdissect_options *ndo,
+ const struct arp_pkthdr *ap, u_short pro)
+{
+ if (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
+ ND_PRINT("<wrong proto type>");
+ else if (PROTO_LEN(ap) != 4)
+ ND_PRINT("<wrong len>");
+ else
+ ND_PRINT("%s", GET_IPADDR_STRING(TPA(ap)));
+}
+
+static void
+spaddr_print_ip(netdissect_options *ndo,
+ const struct arp_pkthdr *ap, u_short pro)
+{
+ if (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
+ ND_PRINT("<wrong proto type>");
+ else if (PROTO_LEN(ap) != 4)
+ ND_PRINT("<wrong len>");
+ else
+ ND_PRINT("%s", GET_IPADDR_STRING(SPA(ap)));
+}
+
+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("<No address>");
+ else {
+ ND_PRINT("%s", GET_LINKADDR_STRING(ha, LINKADDR_ATM, ha_len));
+ if (srca_len != 0)
+ ND_PRINT(",%s",
+ GET_LINKADDR_STRING(srca, LINKADDR_ATM, srca_len));
+ }
+}
+
+static void
+atmarp_tpaddr_print(netdissect_options *ndo,
+ const struct atmarp_pkthdr *ap, u_short pro)
+{
+ if (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
+ ND_PRINT("<wrong proto type>");
+ else if (ATMTPROTO_LEN(ap) != 4)
+ ND_PRINT("<wrong tplen>");
+ else
+ ND_PRINT("%s", GET_IPADDR_STRING(ATMTPA(ap)));
+}
+
+static void
+atmarp_spaddr_print(netdissect_options *ndo,
+ const struct atmarp_pkthdr *ap, u_short pro)
+{
+ if (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL)
+ ND_PRINT("<wrong proto type>");
+ else if (ATMSPROTO_LEN(ap) != 4)
+ ND_PRINT("<wrong splen>");
+ else
+ ND_PRINT("%s", GET_IPADDR_STRING(ATMSPA(ap)));
+}
+
+static void
+atmarp_print(netdissect_options *ndo,
+ const u_char *bp, u_int length, u_int caplen)
+{
+ const struct atmarp_pkthdr *ap;
+ u_short pro, hrd, op;
+
+ ap = (const struct atmarp_pkthdr *)bp;
+ ND_TCHECK_SIZE(ap);
+
+ hrd = ATMHRD(ap);
+ pro = ATMPRO(ap);
+ op = ATMOP(ap);
+
+ ND_TCHECK_LEN(ATMTPA(ap), ATMTPROTO_LEN(ap));
+
+ if (!ndo->ndo_eflag) {
+ ND_PRINT("ARP, ");
+ }
+
+ if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
+ ATMSPROTO_LEN(ap) != 4 ||
+ ATMTPROTO_LEN(ap) != 4 ||
+ ndo->ndo_vflag) {
+ ND_PRINT("%s, %s (len %u/%u)",
+ tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),
+ tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),
+ ATMSPROTO_LEN(ap),
+ ATMTPROTO_LEN(ap));
+
+ /* don't know about the address formats */
+ if (!ndo->ndo_vflag) {
+ goto out;
+ }
+ }
+
+ /* print operation */
+ ND_PRINT("%s%s ",
+ ndo->ndo_vflag ? ", " : "",
+ tok2str(arpop_values, "Unknown (%u)", op));
+
+ switch (op) {
+
+ case ARPOP_REQUEST:
+ ND_PRINT("who-has ");
+ atmarp_tpaddr_print(ndo, ap, pro);
+ if (ATMTHRD_LEN(ap) != 0) {
+ ND_PRINT(" (");
+ atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap),
+ ATMTSA(ap), ATMTSLN(ap));
+ ND_PRINT(")");
+ }
+ ND_PRINT(" tell ");
+ atmarp_spaddr_print(ndo, ap, pro);
+ break;
+
+ case ARPOP_REPLY:
+ atmarp_spaddr_print(ndo, ap, pro);
+ ND_PRINT(" is-at ");
+ atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
+ ATMSSLN(ap));
+ break;
+
+ case ARPOP_INVREQUEST:
+ ND_PRINT("who-is ");
+ atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap), ATMTSA(ap),
+ ATMTSLN(ap));
+ ND_PRINT(" tell ");
+ atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
+ ATMSSLN(ap));
+ break;
+
+ case ARPOP_INVREPLY:
+ atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),
+ ATMSSLN(ap));
+ ND_PRINT("at ");
+ atmarp_spaddr_print(ndo, ap, pro);
+ break;
+
+ case ARPOP_NAK:
+ ND_PRINT("for ");
+ atmarp_spaddr_print(ndo, ap, pro);
+ break;
+
+ default:
+ ND_DEFAULTPRINT((const u_char *)ap, caplen);
+ return;
+ }
+
+ out:
+ ND_PRINT(", length %u", length);
+}
void
-arp_print(const u_char *bp, u_int length, u_int caplen)
+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;
+ u_short pro, hrd, op, linkaddr;
+ ndo->ndo_protocol = "arp";
ap = (const struct arp_pkthdr *)bp;
- TCHECK(*ap);
- if ((const u_char *)(ar_tpa(ap) + PLN(ap)) > snapend) {
- (void)printf("truncated-arp");
- default_print((const u_char *)ap, length);
- return;
+ ND_TCHECK_SIZE(ap);
+
+ hrd = HRD(ap);
+ pro = PRO(ap);
+ op = OP(ap);
+
+
+ /* if its ATM then call the ATM ARP printer
+ for Frame-relay ARP most of the fields
+ are similar to Ethernet so overload the Ethernet Printer
+ and set the linkaddr type for GET_LINKADDR_STRING() accordingly */
+
+ switch(hrd) {
+ case ARPHRD_ATM2225:
+ atmarp_print(ndo, bp, length, caplen);
+ return;
+ case ARPHRD_FRELAY:
+ linkaddr = LINKADDR_FRELAY;
+ break;
+ default:
+ linkaddr = LINKADDR_MAC48;
+ break;
}
- pro = EXTRACT_16BITS(&PRO(ap));
- hrd = EXTRACT_16BITS(&HRD(ap));
- op = EXTRACT_16BITS(&OP(ap));
+ ND_TCHECK_LEN(TPA(ap), PROTO_LEN(ap));
- if (pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) {
- (void)printf("arp-#%d for proto #%d (%d) hardware #%d (%d)",
- op, pro, PLN(ap), hrd, HLN(ap));
- return;
+ if (!ndo->ndo_eflag) {
+ ND_PRINT("ARP, ");
+ }
+
+ /* print hardware type/len and proto type/len */
+ if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||
+ PROTO_LEN(ap) != 4 ||
+ HRD_LEN(ap) == 0 ||
+ ndo->ndo_vflag) {
+ ND_PRINT("%s (len %u), %s (len %u)",
+ tok2str(arphrd_values, "Unknown Hardware (%u)", hrd),
+ HRD_LEN(ap),
+ tok2str(ethertype_values, "Unknown Protocol (0x%04x)", pro),
+ PROTO_LEN(ap));
+
+ /* don't know about the address formats */
+ if (!ndo->ndo_vflag) {
+ goto out;
+ }
}
- if (pro == ETHERTYPE_TRAIL)
- (void)printf("trailer-");
+
+ /* print operation */
+ ND_PRINT("%s%s ",
+ ndo->ndo_vflag ? ", " : "",
+ tok2str(arpop_values, "Unknown (%u)", op));
+
switch (op) {
case ARPOP_REQUEST:
- (void)printf("arp who-has %s", ipaddr_string(TPA(ap)));
- if (memcmp((const char *)ezero, (const char *)THA(ap), HLN(ap)) != 0)
- (void)printf(" (%s)",
- linkaddr_string(THA(ap), HLN(ap)));
- (void)printf(" tell %s", ipaddr_string(SPA(ap)));
+ ND_PRINT("who-has ");
+ tpaddr_print_ip(ndo, ap, pro);
+ if (isnonzero(ndo, (const u_char *)THA(ap), HRD_LEN(ap)))
+ ND_PRINT(" (%s)",
+ GET_LINKADDR_STRING(THA(ap), linkaddr, HRD_LEN(ap)));
+ ND_PRINT(" tell ");
+ spaddr_print_ip(ndo, ap, pro);
break;
case ARPOP_REPLY:
- (void)printf("arp reply %s", ipaddr_string(SPA(ap)));
- (void)printf(" is-at %s", linkaddr_string(SHA(ap), HLN(ap)));
+ spaddr_print_ip(ndo, ap, pro);
+ ND_PRINT(" is-at %s",
+ GET_LINKADDR_STRING(SHA(ap), linkaddr, HRD_LEN(ap)));
break;
case ARPOP_REVREQUEST:
- (void)printf("rarp who-is %s tell %s",
- linkaddr_string(THA(ap), HLN(ap)),
- linkaddr_string(SHA(ap), HLN(ap)));
+ /*
+ * XXX - GET_LINKADDR_STRING() may return a pointer to
+ * a static buffer, so we only have one call to it per
+ * ND_PRINT() call.
+ *
+ * This should be done in a cleaner fashion.
+ */
+ ND_PRINT("who-is %s",
+ GET_LINKADDR_STRING(THA(ap), linkaddr, HRD_LEN(ap)));
+ ND_PRINT(" tell %s",
+ GET_LINKADDR_STRING(SHA(ap), linkaddr, HRD_LEN(ap)));
break;
case ARPOP_REVREPLY:
- (void)printf("rarp reply %s at %s",
- linkaddr_string(THA(ap), HLN(ap)),
- ipaddr_string(TPA(ap)));
+ ND_PRINT("%s at ",
+ GET_LINKADDR_STRING(THA(ap), linkaddr, HRD_LEN(ap)));
+ tpaddr_print_ip(ndo, ap, pro);
+ break;
+
+ case ARPOP_INVREQUEST:
+ /*
+ * XXX - GET_LINKADDR_STRING() may return a pointer to
+ * a static buffer, so we only have one call to it per
+ * ND_PRINT() call.
+ *
+ * This should be done in a cleaner fashion.
+ */
+ ND_PRINT("who-is %s",
+ GET_LINKADDR_STRING(THA(ap), linkaddr, HRD_LEN(ap)));
+ ND_PRINT(" tell %s",
+ GET_LINKADDR_STRING(SHA(ap), linkaddr, HRD_LEN(ap)));
+ break;
+
+ case ARPOP_INVREPLY:
+ ND_PRINT("%s at ",
+ GET_LINKADDR_STRING(SHA(ap), linkaddr, HRD_LEN(ap)));
+ spaddr_print_ip(ndo, ap, pro);
break;
default:
- (void)printf("arp-#%d", op);
- default_print((const u_char *)ap, caplen);
+ ND_DEFAULTPRINT((const u_char *)ap, caplen);
return;
}
- if (hrd != ARPHRD_ETHER)
- printf(" hardware #%d", hrd);
- return;
-trunc:
- (void)printf("[|arp]");
+
+ out:
+ ND_PRINT(", length %u", length);
}
projects / tcpdump / blobdiff