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-rw-r--r--print-egp.c198
1 files changed, 106 insertions, 92 deletions
diff --git a/print-egp.c b/print-egp.c
index 4a1d046..8fba9ce 100644
--- a/print-egp.c
+++ b/print-egp.c
@@ -18,35 +18,28 @@
* Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.38 2006-02-11 22:13:24 hannes Exp $ (LBL)";
-#endif
+/* \summary: Exterior Gateway Protocol (EGP) printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
-
-#include <stdio.h>
+#include <netdissect-stdinc.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
-#include "ip.h"
-
struct egp_packet {
- u_int8_t egp_version;
+ uint8_t egp_version;
#define EGP_VERSION 2
- u_int8_t egp_type;
+ uint8_t egp_type;
#define EGPT_ACQUIRE 3
#define EGPT_REACH 5
#define EGPT_POLL 2
#define EGPT_UPDATE 1
#define EGPT_ERROR 8
- u_int8_t egp_code;
+ uint8_t egp_code;
#define EGPC_REQUEST 0
#define EGPC_CONFIRM 1
#define EGPC_REFUSE 2
@@ -54,7 +47,7 @@ struct egp_packet {
#define EGPC_CEASEACK 4
#define EGPC_HELLO 0
#define EGPC_HEARDU 1
- u_int8_t egp_status;
+ uint8_t egp_status;
#define EGPS_UNSPEC 0
#define EGPS_ACTIVE 1
#define EGPS_PASSIVE 2
@@ -67,13 +60,13 @@ struct egp_packet {
#define EGPS_UP 1
#define EGPS_DOWN 2
#define EGPS_UNSOL 0x80
- u_int16_t egp_checksum;
- u_int16_t egp_as;
- u_int16_t egp_sequence;
+ uint16_t egp_checksum;
+ uint16_t egp_as;
+ uint16_t egp_sequence;
union {
- u_int16_t egpu_hello;
- u_int8_t egpu_gws[2];
- u_int16_t egpu_reason;
+ uint16_t egpu_hello;
+ uint8_t egpu_gws[2];
+ uint16_t egpu_reason;
#define EGPR_UNSPEC 0
#define EGPR_BADHEAD 1
#define EGPR_BADDATA 2
@@ -87,14 +80,14 @@ struct egp_packet {
#define egp_extgw egp_handg.egpu_gws[1]
#define egp_reason egp_handg.egpu_reason
union {
- u_int16_t egpu_poll;
- u_int32_t egpu_sourcenet;
+ uint16_t egpu_poll;
+ uint32_t egpu_sourcenet;
} egp_pands;
#define egp_poll egp_pands.egpu_poll
#define egp_sourcenet egp_pands.egpu_sourcenet
};
-const char *egp_acquire_codes[] = {
+static const char *egp_acquire_codes[] = {
"request",
"confirm",
"refuse",
@@ -102,7 +95,7 @@ const char *egp_acquire_codes[] = {
"cease_ack"
};
-const char *egp_acquire_status[] = {
+static const char *egp_acquire_status[] = {
"unspecified",
"active_mode",
"passive_mode",
@@ -113,18 +106,18 @@ const char *egp_acquire_status[] = {
"protocol_violation"
};
-const char *egp_reach_codes[] = {
+static const char *egp_reach_codes[] = {
"hello",
"i-h-u"
};
-const char *egp_status_updown[] = {
+static const char *egp_status_updown[] = {
"indeterminate",
"up",
"down"
};
-const char *egp_reasons[] = {
+static const char *egp_reasons[] = {
"unspecified",
"bad_EGP_header_format",
"bad_EGP_data_field_format",
@@ -135,11 +128,12 @@ const char *egp_reasons[] = {
};
static void
-egpnrprint(register const struct egp_packet *egp)
+egpnrprint(netdissect_options *ndo,
+ register const struct egp_packet *egp, u_int length)
{
- register const u_int8_t *cp;
- u_int32_t addr;
- register u_int32_t net;
+ register const uint8_t *cp;
+ uint32_t addr;
+ register uint32_t net;
register u_int netlen;
int gateways, distances, networks;
int t_gateways;
@@ -159,13 +153,16 @@ egpnrprint(register const struct egp_packet *egp)
net = 0;
netlen = 0;
}
- cp = (u_int8_t *)(egp + 1);
+ cp = (const uint8_t *)(egp + 1);
+ length -= sizeof(*egp);
t_gateways = egp->egp_intgw + egp->egp_extgw;
for (gateways = 0; gateways < t_gateways; ++gateways) {
/* Pickup host part of gateway address */
addr = 0;
- TCHECK2(cp[0], 4 - netlen);
+ if (length < 4 - netlen)
+ goto trunc;
+ ND_TCHECK2(cp[0], 4 - netlen);
switch (netlen) {
case 1:
@@ -178,69 +175,86 @@ egpnrprint(register const struct egp_packet *egp)
addr = (addr << 8) | *cp++;
}
addr |= net;
- TCHECK2(cp[0], 1);
+ length -= 4 - netlen;
+ if (length < 1)
+ goto trunc;
+ ND_TCHECK2(cp[0], 1);
distances = *cp++;
- printf(" %s %s ",
+ length--;
+ ND_PRINT((ndo, " %s %s ",
gateways < (int)egp->egp_intgw ? "int" : "ext",
- ipaddr_string(&addr));
+ ipaddr_string(ndo, &addr)));
comma = "";
- putchar('(');
+ ND_PRINT((ndo, "("));
while (--distances >= 0) {
- TCHECK2(cp[0], 2);
- printf("%sd%d:", comma, (int)*cp++);
+ if (length < 2)
+ goto trunc;
+ ND_TCHECK2(cp[0], 2);
+ ND_PRINT((ndo, "%sd%d:", comma, (int)*cp++));
comma = ", ";
networks = *cp++;
+ length -= 2;
while (--networks >= 0) {
/* Pickup network number */
- TCHECK2(cp[0], 1);
- addr = (u_int32_t)*cp++ << 24;
+ if (length < 1)
+ goto trunc;
+ ND_TCHECK2(cp[0], 1);
+ addr = (uint32_t)*cp++ << 24;
+ length--;
if (IN_CLASSB(addr)) {
- TCHECK2(cp[0], 1);
- addr |= (u_int32_t)*cp++ << 16;
+ if (length < 1)
+ goto trunc;
+ ND_TCHECK2(cp[0], 1);
+ addr |= (uint32_t)*cp++ << 16;
+ length--;
} else if (!IN_CLASSA(addr)) {
- TCHECK2(cp[0], 2);
- addr |= (u_int32_t)*cp++ << 16;
- addr |= (u_int32_t)*cp++ << 8;
+ if (length < 2)
+ goto trunc;
+ ND_TCHECK2(cp[0], 2);
+ addr |= (uint32_t)*cp++ << 16;
+ addr |= (uint32_t)*cp++ << 8;
+ length -= 2;
}
- printf(" %s", ipaddr_string(&addr));
+ ND_PRINT((ndo, " %s", ipaddr_string(ndo, &addr)));
}
}
- putchar(')');
+ ND_PRINT((ndo, ")"));
}
return;
trunc:
- fputs("[|]", stdout);
+ ND_PRINT((ndo, "[|]"));
}
void
-egp_print(register const u_int8_t *bp, register u_int length)
+egp_print(netdissect_options *ndo,
+ register const uint8_t *bp, register u_int length)
{
register const struct egp_packet *egp;
register int status;
register int code;
register int type;
- egp = (struct egp_packet *)bp;
- if (!TTEST2(*egp, length)) {
- printf("[|egp]");
+ egp = (const struct egp_packet *)bp;
+ if (length < sizeof(*egp) || !ND_TTEST(*egp)) {
+ ND_PRINT((ndo, "[|egp]"));
return;
}
- if (!vflag) {
- printf("EGPv%u, AS %u, seq %u, length %u",
+ if (!ndo->ndo_vflag) {
+ ND_PRINT((ndo, "EGPv%u, AS %u, seq %u, length %u",
egp->egp_version,
EXTRACT_16BITS(&egp->egp_as),
EXTRACT_16BITS(&egp->egp_sequence),
- length);
+ length));
return;
} else
- printf("EGPv%u, length %u",
+ ND_PRINT((ndo, "EGPv%u, length %u",
egp->egp_version,
- length);
+ length));
if (egp->egp_version != EGP_VERSION) {
- printf("[version %d]", egp->egp_version);
+ ND_PRINT((ndo, "[version %d]", egp->egp_version));
return;
}
@@ -250,31 +264,31 @@ egp_print(register const u_int8_t *bp, register u_int length)
switch (type) {
case EGPT_ACQUIRE:
- printf(" acquire");
+ ND_PRINT((ndo, " acquire"));
switch (code) {
case EGPC_REQUEST:
case EGPC_CONFIRM:
- printf(" %s", egp_acquire_codes[code]);
+ ND_PRINT((ndo, " %s", egp_acquire_codes[code]));
switch (status) {
case EGPS_UNSPEC:
case EGPS_ACTIVE:
case EGPS_PASSIVE:
- printf(" %s", egp_acquire_status[status]);
+ ND_PRINT((ndo, " %s", egp_acquire_status[status]));
break;
default:
- printf(" [status %d]", status);
+ ND_PRINT((ndo, " [status %d]", status));
break;
}
- printf(" hello:%d poll:%d",
+ ND_PRINT((ndo, " hello:%d poll:%d",
EXTRACT_16BITS(&egp->egp_hello),
- EXTRACT_16BITS(&egp->egp_poll));
+ EXTRACT_16BITS(&egp->egp_poll)));
break;
case EGPC_REFUSE:
case EGPC_CEASE:
case EGPC_CEASEACK:
- printf(" %s", egp_acquire_codes[code]);
+ ND_PRINT((ndo, " %s", egp_acquire_codes[code]));
switch (status ) {
case EGPS_UNSPEC:
case EGPS_NORES:
@@ -282,17 +296,17 @@ egp_print(register const u_int8_t *bp, register u_int length)
case EGPS_GODOWN:
case EGPS_PARAM:
case EGPS_PROTO:
- printf(" %s", egp_acquire_status[status]);
+ ND_PRINT((ndo, " %s", egp_acquire_status[status]));
break;
default:
- printf("[status %d]", status);
+ ND_PRINT((ndo, "[status %d]", status));
break;
}
break;
default:
- printf("[code %d]", code);
+ ND_PRINT((ndo, "[code %d]", code));
break;
}
break;
@@ -302,61 +316,61 @@ egp_print(register const u_int8_t *bp, register u_int length)
case EGPC_HELLO:
case EGPC_HEARDU:
- printf(" %s", egp_reach_codes[code]);
+ ND_PRINT((ndo, " %s", egp_reach_codes[code]));
if (status <= EGPS_DOWN)
- printf(" state:%s", egp_status_updown[status]);
+ ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
else
- printf(" [status %d]", status);
+ ND_PRINT((ndo, " [status %d]", status));
break;
default:
- printf("[reach code %d]", code);
+ ND_PRINT((ndo, "[reach code %d]", code));
break;
}
break;
case EGPT_POLL:
- printf(" poll");
+ ND_PRINT((ndo, " poll"));
if (egp->egp_status <= EGPS_DOWN)
- printf(" state:%s", egp_status_updown[status]);
+ ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
else
- printf(" [status %d]", status);
- printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
+ ND_PRINT((ndo, " [status %d]", status));
+ ND_PRINT((ndo, " net:%s", ipaddr_string(ndo, &egp->egp_sourcenet)));
break;
case EGPT_UPDATE:
- printf(" update");
+ ND_PRINT((ndo, " update"));
if (status & EGPS_UNSOL) {
status &= ~EGPS_UNSOL;
- printf(" unsolicited");
+ ND_PRINT((ndo, " unsolicited"));
}
if (status <= EGPS_DOWN)
- printf(" state:%s", egp_status_updown[status]);
+ ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
else
- printf(" [status %d]", status);
- printf(" %s int %d ext %d",
- ipaddr_string(&egp->egp_sourcenet),
+ ND_PRINT((ndo, " [status %d]", status));
+ ND_PRINT((ndo, " %s int %d ext %d",
+ ipaddr_string(ndo, &egp->egp_sourcenet),
egp->egp_intgw,
- egp->egp_extgw);
- if (vflag)
- egpnrprint(egp);
+ egp->egp_extgw));
+ if (ndo->ndo_vflag)
+ egpnrprint(ndo, egp, length);
break;
case EGPT_ERROR:
- printf(" error");
+ ND_PRINT((ndo, " error"));
if (status <= EGPS_DOWN)
- printf(" state:%s", egp_status_updown[status]);
+ ND_PRINT((ndo, " state:%s", egp_status_updown[status]));
else
- printf(" [status %d]", status);
+ ND_PRINT((ndo, " [status %d]", status));
if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
- printf(" %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]);
+ ND_PRINT((ndo, " %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]));
else
- printf(" [reason %d]", EXTRACT_16BITS(&egp->egp_reason));
+ ND_PRINT((ndo, " [reason %d]", EXTRACT_16BITS(&egp->egp_reason)));
break;
default:
- printf("[type %d]", type);
+ ND_PRINT((ndo, "[type %d]", type));
break;
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 13:04:53 +0000