/* \summary: Distance Vector Multicast Routing Protocol printer */
#ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
#endif
-#include <netdissect-stdinc.h>
+#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "extract.h"
#define DVMRP_PRUNE 7 /* prune message */
#define DVMRP_GRAFT 8 /* graft message */
#define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */
+static const struct tok dvmrp_msgtype_str[] = {
+ { DVMRP_PROBE, "Probe" },
+ { DVMRP_REPORT, "Report" },
+ { DVMRP_ASK_NEIGHBORS, "Ask-neighbors(old)" },
+ { DVMRP_NEIGHBORS, "Neighbors(old)" },
+ { DVMRP_ASK_NEIGHBORS2, "Ask-neighbors2" },
+ { DVMRP_NEIGHBORS2, "Neighbors2" },
+ { DVMRP_PRUNE, "Prune" },
+ { DVMRP_GRAFT, "Graft" },
+ { DVMRP_GRAFT_ACK, "Graft-ACK" },
+ { 0, NULL }
+};
/*
* 'flags' byte values in DVMRP_NEIGHBORS2 reply.
#define DVMRP_NF_DISABLED 0x20 /* administratively disabled */
#define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */
-static int print_probe(netdissect_options *, const u_char *, const u_char *, u_int);
-static int print_report(netdissect_options *, const u_char *, const u_char *, u_int);
-static int print_neighbors(netdissect_options *, const u_char *, const u_char *, u_int);
-static int print_neighbors2(netdissect_options *, const u_char *, const u_char *, u_int, uint8_t, uint8_t);
-static int print_prune(netdissect_options *, const u_char *);
-static int print_graft(netdissect_options *, const u_char *);
-static int print_graft_ack(netdissect_options *, const u_char *);
+static void print_probe(netdissect_options *, const u_char *, u_int);
+static void print_report(netdissect_options *, const u_char *, u_int);
+static void print_neighbors(netdissect_options *, const u_char *, u_int);
+static void print_neighbors2(netdissect_options *, const u_char *, u_int, uint8_t, uint8_t);
void
dvmrp_print(netdissect_options *ndo,
const u_char *bp, u_int len)
{
- const u_char *ep;
u_char type;
uint8_t major_version, minor_version;
- ep = ndo->ndo_snapend;
- if (bp >= ep)
- return;
+ ndo->ndo_protocol = "dvmrp";
+ if (len < 8) {
+ ND_PRINT(" [length %u < 8]", len);
+ goto invalid;
+ }
- ND_TCHECK_1(bp + 1);
- type = EXTRACT_U_1(bp + 1);
+ type = GET_U_1(bp + 1);
/* Skip IGMP header */
bp += 8;
len -= 8;
+ ND_PRINT(" %s", tok2str(dvmrp_msgtype_str, "[type %u]", type));
switch (type) {
case DVMRP_PROBE:
- ND_PRINT(" Probe");
if (ndo->ndo_vflag) {
- if (print_probe(ndo, bp, ep, len) < 0)
- goto trunc;
+ print_probe(ndo, bp, len);
}
break;
case DVMRP_REPORT:
- ND_PRINT(" Report");
if (ndo->ndo_vflag > 1) {
- if (print_report(ndo, bp, ep, len) < 0)
- goto trunc;
+ print_report(ndo, bp, len);
}
break;
- case DVMRP_ASK_NEIGHBORS:
- ND_PRINT(" Ask-neighbors(old)");
- break;
-
case DVMRP_NEIGHBORS:
- ND_PRINT(" Neighbors(old)");
- if (print_neighbors(ndo, bp, ep, len) < 0)
- goto trunc;
- break;
-
- case DVMRP_ASK_NEIGHBORS2:
- ND_PRINT(" Ask-neighbors2");
+ print_neighbors(ndo, bp, len);
break;
case DVMRP_NEIGHBORS2:
- ND_PRINT(" Neighbors2");
/*
* extract version from IGMP group address field
*/
bp -= 4;
- ND_TCHECK_4(bp);
- major_version = EXTRACT_U_1(bp + 3);
- minor_version = EXTRACT_U_1(bp + 2);
+ major_version = GET_U_1(bp + 3);
+ minor_version = GET_U_1(bp + 2);
bp += 4;
- if (print_neighbors2(ndo, bp, ep, len, major_version,
- minor_version) < 0)
- goto trunc;
+ print_neighbors2(ndo, bp, len, major_version, minor_version);
break;
case DVMRP_PRUNE:
- ND_PRINT(" Prune");
- if (print_prune(ndo, bp) < 0)
- goto trunc;
+ ND_PRINT(" src %s grp %s", GET_IPADDR_STRING(bp), GET_IPADDR_STRING(bp + 4));
+ ND_PRINT(" timer ");
+ unsigned_relts_print(ndo, GET_BE_U_4(bp + 8));
break;
case DVMRP_GRAFT:
- ND_PRINT(" Graft");
- if (print_graft(ndo, bp) < 0)
- goto trunc;
+ ND_PRINT(" src %s grp %s", GET_IPADDR_STRING(bp), GET_IPADDR_STRING(bp + 4));
break;
case DVMRP_GRAFT_ACK:
- ND_PRINT(" Graft-ACK");
- if (print_graft_ack(ndo, bp) < 0)
- goto trunc;
- break;
-
- default:
- ND_PRINT(" [type %u]", type);
+ ND_PRINT(" src %s grp %s", GET_IPADDR_STRING(bp), GET_IPADDR_STRING(bp + 4));
break;
}
return;
-trunc:
- ND_PRINT("[|dvmrp]");
- return;
+invalid:
+ nd_print_invalid(ndo);
}
-static int
+static void
print_report(netdissect_options *ndo,
- const u_char *bp, const u_char *ep,
+ const u_char *bp,
u_int len)
{
uint32_t mask, origin;
while (len > 0) {
if (len < 3) {
- ND_PRINT(" [|]");
- return (0);
+ ND_PRINT(" [length %u < 3]", len);
+ goto invalid;
}
- ND_TCHECK_3(bp);
- mask = (uint32_t)0xff << 24 | EXTRACT_U_1(bp) << 16 |
- EXTRACT_U_1(bp + 1) << 8 | EXTRACT_U_1(bp + 2);
+ mask = (uint32_t)0xff << 24 | GET_U_1(bp) << 16 |
+ GET_U_1(bp + 1) << 8 | GET_U_1(bp + 2);
width = 1;
- if (EXTRACT_U_1(bp))
+ if (GET_U_1(bp))
width = 2;
- if (EXTRACT_U_1(bp + 1))
+ if (GET_U_1(bp + 1))
width = 3;
- if (EXTRACT_U_1(bp + 2))
+ if (GET_U_1(bp + 2))
width = 4;
ND_PRINT("\n\tMask %s", intoa(htonl(mask)));
bp += 3;
len -= 3;
do {
- if (bp + width + 1 > ep) {
- ND_PRINT(" [|]");
- return (0);
- }
if (len < width + 1) {
ND_PRINT("\n\t [Truncated Report]");
- return (0);
+ goto invalid;
}
origin = 0;
for (i = 0; i < width; ++i) {
- ND_TCHECK_1(bp);
- origin = origin << 8 | EXTRACT_U_1(bp);
+ origin = origin << 8 | GET_U_1(bp);
bp++;
}
for ( ; i < 4; ++i)
origin <<= 8;
- ND_TCHECK_1(bp);
- metric = EXTRACT_U_1(bp);
+ metric = GET_U_1(bp);
bp++;
done = metric & 0x80;
metric &= 0x7f;
len -= width + 1;
} while (!done);
}
- return (0);
-trunc:
- return (-1);
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
}
-static int
+static void
print_probe(netdissect_options *ndo,
- const u_char *bp, const u_char *ep,
+ const u_char *bp,
u_int len)
{
- uint32_t genid;
-
- ND_TCHECK_4(bp);
- if ((len < 4) || ((bp + 4) > ep)) {
- /* { (ctags) */
- ND_PRINT(" [|}");
- return (0);
+ if (len < 4) {
+ ND_PRINT(" [full length %u < 4]", len);
+ goto invalid;
}
- genid = (EXTRACT_U_1(bp) << 24) | (EXTRACT_U_1(bp + 1) << 16) |
- (EXTRACT_U_1(bp + 2) << 8) | EXTRACT_U_1(bp + 3);
- bp += 4;
- len -= 4;
ND_PRINT(ndo->ndo_vflag > 1 ? "\n\t" : " ");
- ND_PRINT("genid %u", genid);
+ ND_PRINT("genid %u", GET_BE_U_4(bp));
if (ndo->ndo_vflag < 2)
- return (0);
+ return;
- while ((len > 0) && (bp < ep)) {
- ND_TCHECK_4(bp);
- ND_PRINT("\n\tneighbor %s", ipaddr_string(ndo, bp));
+ bp += 4;
+ len -= 4;
+ while (len > 0) {
+ if (len < 4) {
+ ND_PRINT("[remaining length %u < 4]", len);
+ goto invalid;
+ }
+ ND_PRINT("\n\tneighbor %s", GET_IPADDR_STRING(bp));
bp += 4; len -= 4;
}
- return (0);
-trunc:
- return (-1);
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
}
-static int
+static void
print_neighbors(netdissect_options *ndo,
- const u_char *bp, const u_char *ep,
+ const u_char *bp,
u_int len)
{
const u_char *laddr;
u_char thresh;
int ncount;
- while (len > 0 && bp < ep) {
- ND_TCHECK_7(bp);
+ while (len > 0) {
+ if (len < 7) {
+ ND_PRINT(" [length %u < 7]", len);
+ goto invalid;
+ }
laddr = bp;
bp += 4;
- metric = EXTRACT_U_1(bp);
+ metric = GET_U_1(bp);
bp++;
- thresh = EXTRACT_U_1(bp);
+ thresh = GET_U_1(bp);
bp++;
- ncount = EXTRACT_U_1(bp);
+ ncount = GET_U_1(bp);
bp++;
len -= 7;
while (--ncount >= 0) {
- ND_TCHECK_4(bp);
- ND_PRINT(" [%s ->", ipaddr_string(ndo, laddr));
+ if (len < 4) {
+ ND_PRINT(" [length %u < 4]", len);
+ goto invalid;
+ }
+ ND_PRINT(" [%s ->", GET_IPADDR_STRING(laddr));
ND_PRINT(" %s, (%u/%u)]",
- ipaddr_string(ndo, bp), metric, thresh);
+ GET_IPADDR_STRING(bp), metric, thresh);
bp += 4;
len -= 4;
}
}
- return (0);
-trunc:
- return (-1);
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
}
-static int
+static void
print_neighbors2(netdissect_options *ndo,
- const u_char *bp, const u_char *ep,
+ const u_char *bp,
u_int len, uint8_t major_version,
uint8_t minor_version)
{
ND_PRINT(" (v %u.%u):", major_version, minor_version);
- while (len > 0 && bp < ep) {
- ND_TCHECK_8(bp);
+ while (len > 0) {
+ if (len < 8) {
+ ND_PRINT(" [length %u < 8]", len);
+ goto invalid;
+ }
laddr = bp;
bp += 4;
- metric = EXTRACT_U_1(bp);
+ metric = GET_U_1(bp);
bp++;
- thresh = EXTRACT_U_1(bp);
+ thresh = GET_U_1(bp);
bp++;
- flags = EXTRACT_U_1(bp);
+ flags = GET_U_1(bp);
bp++;
- ncount = EXTRACT_U_1(bp);
+ ncount = GET_U_1(bp);
bp++;
len -= 8;
- while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
- ND_PRINT(" [%s -> ", ipaddr_string(ndo, laddr));
- ND_PRINT("%s (%u/%u", ipaddr_string(ndo, bp),
+ while (--ncount >= 0 && len > 0) {
+ if (len < 4) {
+ ND_PRINT(" [length %u < 4]", len);
+ goto invalid;
+ }
+ ND_PRINT(" [%s -> ", GET_IPADDR_STRING(laddr));
+ ND_PRINT("%s (%u/%u", GET_IPADDR_STRING(bp),
metric, thresh);
if (flags & DVMRP_NF_TUNNEL)
ND_PRINT("/tunnel");
len -= 4;
}
if (ncount != -1) {
- ND_PRINT(" [|]");
- return (0);
+ ND_PRINT(" [invalid ncount]");
+ goto invalid;
}
}
- return (0);
-trunc:
- return (-1);
-}
-
-static int
-print_prune(netdissect_options *ndo,
- const u_char *bp)
-{
- ND_TCHECK_LEN(bp, 12);
- ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
- bp += 8;
- ND_PRINT(" timer ");
- unsigned_relts_print(ndo, EXTRACT_BE_U_4(bp));
- return (0);
-trunc:
- return (-1);
-}
-
-static int
-print_graft(netdissect_options *ndo,
- const u_char *bp)
-{
- ND_TCHECK_8(bp);
- ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
- return (0);
-trunc:
- return (-1);
-}
+ return;
-static int
-print_graft_ack(netdissect_options *ndo,
- const u_char *bp)
-{
- ND_TCHECK_8(bp);
- ND_PRINT(" src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4));
- return (0);
-trunc:
- return (-1);
+invalid:
+ nd_print_invalid(ndo);
}
projects / tcpdump / blobdiff