The Tcpdump Group git mirrors - tcpdump/blobdiff

* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

*/

* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

*/

-#ifndef lint

-static const char rcsid[] =

- "@(#) $Header: /tcpdump/master/tcpdump/print-arp.c,v 1.46 2000-09-23 08:03:31 guy Exp $ (LBL)";

-#endif

-

+#define NETDISSECT_REWORKED

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

-#include <sys/param.h>

-#include <sys/time.h>

-#include <sys/socket.h>

-

-struct mbuf;

-struct rtentry;

-#include <net/if.h>

+#include <tcpdump-stdinc.h>

-#include <netinet/in.h>

-

-#include <stdio.h>

#include <string.h>

#include "interface.h"

#include <string.h>

#include "interface.h"

#include "ethertype.h"

#include "extract.h" /* must come after interface.h */

#include "ethertype.h"

#include "extract.h" /* must come after interface.h */

+static const char tstr[] = "[|ARP]";

+

/*

* Address Resolution Protocol.

*

/*

* Address Resolution Protocol.

*

* arp_tha and arp_tpa in that order, according to the lengths

* specified. Field names used correspond to RFC 826.

*/

* arp_tha and arp_tpa in that order, according to the lengths

* specified. Field names used correspond to RFC 826.

*/

-struct arphdr {

- 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_FRELAY 15 /* frame relay 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 {

+ 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_ATM2225 19 /* ATM (RFC 2225) */

+#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 */

+#define ARPOP_NAK 10 /* NAK - only valif for ATM ARP */

+

/*

* The remaining fields are variable in size,

* according to the sizes above.

/*

* The remaining fields are variable in size,

* according to the sizes above.

u_char ar_tha[]; /* target hardware address */

u_char ar_tpa[]; /* target protocol address */

#endif

u_char ar_tha[]; /* target hardware address */

u_char 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 ARP_HDRLEN 8

+

+#define HRD(ap) EXTRACT_16BITS(&(ap)->ar_hrd)

+#define HRD_LEN(ap) ((ap)->ar_hln)

+#define PROTO_LEN(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))

+

+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" },

+ { 0, NULL }

};

/*

};

/*

- * Ethernet Address Resolution Protocol.

+ * ATM Address Resolution Protocol.

*

- * See RFC 826 for protocol description. Structure below is adapted

- * to resolving internet addresses. Field names used correspond to

- * RFC 826.

+ * 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 ether_arp {

- struct arphdr ea_hdr; /* fixed-size header */

- u_char arp_sha[6]; /* sender hardware address */

- u_char arp_spa[4]; /* sender protocol address */

- u_char arp_tha[6]; /* target hardware address */

- u_char arp_tpa[4]; /* target protocol address */

-};

-#define arp_hrd ea_hdr.ar_hrd

-#define arp_pro ea_hdr.ar_pro

-#define arp_hln ea_hdr.ar_hln

-#define arp_pln ea_hdr.ar_pln

-#define arp_op ea_hdr.ar_op

-

-#define SHA(ap) ((ap)->arp_sha)

-#define THA(ap) ((ap)->arp_tha)

-#define SPA(ap) ((ap)->arp_spa)

-#define TPA(ap) ((ap)->arp_tpa)

-

-/* Compatibility */

-#ifndef REVARP_REQUEST

-#define REVARP_REQUEST 3

-#endif

-#ifndef REVARP_REPLY

-#define REVARP_REPLY 4

+struct atmarp_pkthdr {

+ u_short aar_hrd; /* format of hardware address */

+ 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 */

+ 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 ATMSHRD_LEN(ap) ((ap)->aar_shtl & ATMARP_LEN_MASK)

+#define ATMSSLN(ap) ((ap)->aar_sstl & ATMARP_LEN_MASK)

+#define ATMSPROTO_LEN(ap) ((ap)->aar_spln)

+#define ATMOP(ap) EXTRACT_16BITS(&(ap)->aar_op)

+#define ATMPRO(ap) EXTRACT_16BITS(&(ap)->aar_pro)

+#define ATMTHRD_LEN(ap) ((ap)->aar_thtl & ATMARP_LEN_MASK)

+#define ATMTSLN(ap) ((ap)->aar_tstl & ATMARP_LEN_MASK)

+#define ATMTPROTO_LEN(ap) ((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 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(ndo, ha, LINKADDR_ATM, ha_len)));

+ if (srca_len != 0)

+ ND_PRINT((ndo, ",%s",

+ linkaddr_string(ndo, srca, LINKADDR_ATM, 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);

- ap = (struct ether_arp *)bp;

- if ((u_char *)(ap + 1) > snapend) {

- printf("[|arp]");

+ if (!ND_TTEST2(*aar_tpa(ap), ATMTPROTO_LEN(ap))) {

+ ND_PRINT((ndo, "%s", tstr));

+ ND_DEFAULTPRINT((const u_char *)ap, length);

return;

}

return;

}

- if (length < sizeof(struct ether_arp)) {

- (void)printf("truncated-arp");

- default_print((u_char *)ap, length);

+

+ if (!ndo->ndo_eflag) {

+ ND_PRINT((ndo, "ARP, "));

+ }

+

+ if ((pro != ETHERTYPE_IP && pro != ETHERTYPE_TRAIL) ||

+ ATMSPROTO_LEN(ap) != 4 ||

+ ATMTPROTO_LEN(ap) != 4 ||

+ ndo->ndo_vflag) {

+ ND_PRINT((ndo, "%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 know about the address formats */

+ if (!ndo->ndo_vflag) {

+ goto out;

+ }

+

+ /* print operation */

+ ND_PRINT((ndo, "%s%s ",

+ ndo->ndo_vflag ? ", " : "",

+ tok2str(arpop_values, "Unknown (%u)", op)));

+

+ switch (op) {

+

+ case ARPOP_REQUEST:

+ ND_PRINT((ndo, "who-has %s", ipaddr_string(ndo, ATMTPA(ap))));

+ if (ATMTHRD_LEN(ap) != 0) {

+ ND_PRINT((ndo, " ("));

+ atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap),

+ ATMTSA(ap), ATMTSLN(ap));

+ ND_PRINT((ndo, ")"));

+ }

+ ND_PRINT((ndo, "tell %s", ipaddr_string(ndo, ATMSPA(ap))));

+ break;

+

+ case ARPOP_REPLY:

+ ND_PRINT((ndo, "%s is-at ", ipaddr_string(ndo, ATMSPA(ap))));

+ atmarp_addr_print(ndo, ATMSHA(ap), ATMSHRD_LEN(ap), ATMSSA(ap),

+ ATMSSLN(ap));

+ break;

+

+ case ARPOP_INVREQUEST:

+ ND_PRINT((ndo, "who-is "));

+ atmarp_addr_print(ndo, ATMTHA(ap), ATMTHRD_LEN(ap), ATMTSA(ap),

+ ATMTSLN(ap));

+ ND_PRINT((ndo, " 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((ndo, "at %s", ipaddr_string(ndo, ATMSPA(ap))));

+ break;

+

+ case ARPOP_NAK:

+ ND_PRINT((ndo, "for %s", ipaddr_string(ndo, ATMSPA(ap))));

+ break;

+

+ default:

+ ND_DEFAULTPRINT((const u_char *)ap, caplen);

return;

}

return;

}

- pro = EXTRACT_16BITS(&ap->arp_pro);

- hrd = EXTRACT_16BITS(&ap->arp_hrd);

- op = EXTRACT_16BITS(&ap->arp_op);

+ out:

+ ND_PRINT((ndo, ", length %u", length));

+ return;

+

+trunc:

+ ND_PRINT((ndo, "%s", tstr));

+}

+

+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, linkaddr;

+

+ ap = (const struct arp_pkthdr *)bp;

+ ND_TCHECK(*ap);

+

+ hrd = HRD(ap);

+ pro = PRO(ap);

+ op = OP(ap);

+

- 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 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 linkaddr_string(ndo, ) accordingly */

+

+ switch(hrd) {

+ case ARPHRD_ATM2225:

+ atmarp_print(ndo, bp, length, caplen);

+ return;

+ case ARPHRD_FRELAY:

+ linkaddr = LINKADDR_FRELAY;

+ break;

+ default:

+ linkaddr = LINKADDR_ETHER;

+ break;

+ }

+

+ if (!ND_TTEST2(*ar_tpa(ap), PROTO_LEN(ap))) {

+ ND_PRINT((ndo, "%s", tstr));

+ ND_DEFAULTPRINT((const u_char *)ap, length);

return;

}

return;

}

- if (pro == ETHERTYPE_TRAIL)

- (void)printf("trailer-");

- eh = (struct ether_header *)packetp;

+

+ if (!ndo->ndo_eflag) {

+ ND_PRINT((ndo, "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((ndo, "%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 know about the address formats */

+ if (!ndo->ndo_vflag) {

+ goto out;

+ }

+

+ /* print operation */

+ ND_PRINT((ndo, "%s%s ",

+ ndo->ndo_vflag ? ", " : "",

+ tok2str(arpop_values, "Unknown (%u)", op)));

+

switch (op) {

case ARPOP_REQUEST:

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, "who-has %s", ipaddr_string(ndo, TPA(ap))));

+ if (memcmp((const char *)ezero, (const char *)THA(ap), HRD_LEN(ap)) != 0)

+ ND_PRINT((ndo, " (%s)",

+ linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap))));

+ ND_PRINT((ndo, " tell %s", ipaddr_string(ndo, SPA(ap))));

break;

case ARPOP_REPLY:

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, "%s is-at %s",

+ ipaddr_string(ndo, SPA(ap)),

+ linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(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, "who-is %s tell %s",

+ linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),

+ linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(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, "%s at %s",

+ linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),

+ ipaddr_string(ndo, TPA(ap))));

+ break;

+

+ case ARPOP_INVREQUEST:

+ ND_PRINT((ndo, "who-is %s tell %s",

+ linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),

+ linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));

+ break;

+

+ case ARPOP_INVREPLY:

+ ND_PRINT((ndo,"%s at %s",

+ linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap)),

+ ipaddr_string(ndo, SPA(ap))));

break;

default:

break;

default:

- (void)printf("arp-#%d", op);

- default_print((u_char *)ap, caplen);

+ ND_DEFAULTPRINT((const u_char *)ap, caplen);

return;

}

return;

}

- if (hrd != ARPHRD_ETHER)

- printf(" hardware #%d", hrd);

+

+ out:

+ ND_PRINT((ndo, ", length %u", length));

+

+ return;

+trunc:

+ ND_PRINT((ndo, "%s", tstr));

}

+

+/*

+ * Local Variables:

+ * c-style: bsd

+ * End:

+ */

+