* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+/* \summary: Address Resolution Protocol (ARP) printer */
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.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 */
+#include "extract.h"
static const char tstr[] = "[|ARP]";
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_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(ap) EXTRACT_BE_U_2(&(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 OP(ap) EXTRACT_BE_U_2(&(ap)->ar_op)
+#define PRO(ap) EXTRACT_BE_U_2(&(ap)->ar_pro)
#define SHA(ap) (ar_sha(ap))
#define SPA(ap) (ar_spa(ap))
#define THA(ap) (ar_tha(ap))
u_char aar_tpa[]; /* target protocol address */
#endif
-#define ATMHRD(ap) EXTRACT_16BITS(&(ap)->aar_hrd)
+#define ATMHRD(ap) EXTRACT_BE_U_2(&(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 ATMOP(ap) EXTRACT_BE_U_2(&(ap)->aar_op)
+#define ATMPRO(ap) EXTRACT_BE_U_2(&(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 ATMTSA(ap) (aar_tsa(ap))
#define ATMTPA(ap) (aar_tpa(ap))
-static u_char ezero[6];
+static int
+isnonzero(const u_char *a, size_t len)
+{
+ while (len > 0) {
+ if (EXTRACT_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((ndo, "<wrong proto type>"));
+ else if (PROTO_LEN(ap) != 4)
+ ND_PRINT((ndo, "<wrong len>"));
+ else
+ ND_PRINT((ndo, "%s", ipaddr_string(ndo, 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((ndo, "<wrong proto type>"));
+ else if (PROTO_LEN(ap) != 4)
+ ND_PRINT((ndo, "<wrong len>"));
+ else
+ ND_PRINT((ndo, "%s", ipaddr_string(ndo, SPA(ap))));
+}
static void
atmarp_addr_print(netdissect_options *ndo,
}
}
+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((ndo, "<wrong proto type>"));
+ else if (ATMTPROTO_LEN(ap) != 4)
+ ND_PRINT((ndo, "<wrong tplen>"));
+ else
+ ND_PRINT((ndo, "%s", ipaddr_string(ndo, 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((ndo, "<wrong proto type>"));
+ else if (ATMSPROTO_LEN(ap) != 4)
+ ND_PRINT((ndo, "<wrong splen>"));
+ else
+ ND_PRINT((ndo, "%s", ipaddr_string(ndo, ATMSPA(ap))));
+}
+
static void
atmarp_print(netdissect_options *ndo,
const u_char *bp, u_int length, u_int caplen)
pro = ATMPRO(ap);
op = ATMOP(ap);
- if (!ND_TTEST2(*aar_tpa(ap), ATMTPROTO_LEN(ap))) {
+ if (!ND_TTEST_LEN(aar_tpa(ap), ATMTPROTO_LEN(ap))) {
ND_PRINT((ndo, "%s", tstr));
ND_DEFAULTPRINT((const u_char *)ap, length);
return;
switch (op) {
case ARPOP_REQUEST:
- ND_PRINT((ndo, "who-has %s", ipaddr_string(ndo, ATMTPA(ap))));
+ ND_PRINT((ndo, "who-has "));
+ atmarp_tpaddr_print(ndo, ap, pro);
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))));
+ ND_PRINT((ndo, " tell "));
+ atmarp_spaddr_print(ndo, ap, pro);
break;
case ARPOP_REPLY:
- ND_PRINT((ndo, "%s is-at ", ipaddr_string(ndo, ATMSPA(ap))));
+ atmarp_spaddr_print(ndo, ap, pro);
+ ND_PRINT((ndo, " is-at "));
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))));
+ ND_PRINT((ndo, "at "));
+ atmarp_spaddr_print(ndo, ap, pro);
break;
case ARPOP_NAK:
- ND_PRINT((ndo, "for %s", ipaddr_string(ndo, ATMSPA(ap))));
+ ND_PRINT((ndo, "for "));
+ atmarp_spaddr_print(ndo, ap, pro);
break;
default:
break;
}
- if (!ND_TTEST2(*ar_tpa(ap), PROTO_LEN(ap))) {
+ if (!ND_TTEST_LEN(TPA(ap), PROTO_LEN(ap))) {
ND_PRINT((ndo, "%s", tstr));
ND_DEFAULTPRINT((const u_char *)ap, length);
return;
switch (op) {
case ARPOP_REQUEST:
- 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, "who-has "));
+ tpaddr_print_ip(ndo, ap, pro);
+ if (isnonzero((const u_char *)THA(ap), HRD_LEN(ap)))
ND_PRINT((ndo, " (%s)",
linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap))));
- ND_PRINT((ndo, " tell %s", ipaddr_string(ndo, SPA(ap))));
+ ND_PRINT((ndo, " tell "));
+ spaddr_print_ip(ndo, ap, pro);
break;
case ARPOP_REPLY:
- ND_PRINT((ndo, "%s is-at %s",
- ipaddr_string(ndo, SPA(ap)),
+ spaddr_print_ip(ndo, ap, pro);
+ ND_PRINT((ndo, " is-at %s",
linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
break;
break;
case ARPOP_REVREPLY:
- ND_PRINT((ndo, "%s at %s",
- linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap)),
- ipaddr_string(ndo, TPA(ap))));
+ ND_PRINT((ndo, "%s at ",
+ linkaddr_string(ndo, THA(ap), linkaddr, HRD_LEN(ap))));
+ tpaddr_print_ip(ndo, ap, pro);
break;
case ARPOP_INVREQUEST:
break;
case ARPOP_INVREPLY:
- ND_PRINT((ndo,"%s at %s",
- linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap)),
- ipaddr_string(ndo, SPA(ap))));
+ ND_PRINT((ndo,"%s at ",
+ linkaddr_string(ndo, SHA(ap), linkaddr, HRD_LEN(ap))));
+ spaddr_print_ip(ndo, ap, pro);
break;
default:
projects / tcpdump / blobdiff