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gre: add support for MikroTik Ethernet-over-IP hack.
[tcpdump] / print-egp.c
diff --git a/print-egp.c b/print-egp.c
index 90fa6c5b6efb311b276c58cd5cabf18333d7d9c1..526e36dde6563167559d04dbfca20b06d5d85445 100644 (file)
--- a/print-egp.c
+++ b/print-egp.c
@@ -18,40 +18,31 @@
  * Initial contribution from Jeff Honig ([email protected]).
  */
 
  * Initial contribution from Jeff Honig ([email protected]).
  */
 
-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.28 2001-09-17 21:58:01 fenner Exp $ (LBL)";
-#endif
+/* \summary: Exterior Gateway Protocol (EGP) printer */
+
+/* specification: RFC 827 */
 
 #ifdef HAVE_CONFIG_H
 
 #ifdef HAVE_CONFIG_H
-#include "config.h"
+#include <config.h>
 #endif
 
 #endif
 
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/uio.h>
-#include <sys/socket.h>
-
-#include <netinet/in.h>
+#include "netdissect-stdinc.h"
 
 
-#include <netdb.h>
-#include <stdio.h>
-
-#include "interface.h"
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
 #include "addrtoname.h"
 #include "addrtoname.h"
-
-#include "ip.h"
+#include "extract.h"
 
 struct egp_packet {
 
 struct egp_packet {
-       u_char  egp_version;
+       nd_uint8_t  egp_version;
 #define        EGP_VERSION     2
 #define        EGP_VERSION     2
-       u_char  egp_type;
+       nd_uint8_t  egp_type;
 #define  EGPT_ACQUIRE  3
 #define  EGPT_REACH    5
 #define  EGPT_POLL     2
 #define  EGPT_UPDATE   1
 #define  EGPT_ERROR    8
 #define  EGPT_ACQUIRE  3
 #define  EGPT_REACH    5
 #define  EGPT_POLL     2
 #define  EGPT_UPDATE   1
 #define  EGPT_ERROR    8
-       u_char  egp_code;
+       nd_uint8_t  egp_code;
 #define  EGPC_REQUEST  0
 #define  EGPC_CONFIRM  1
 #define  EGPC_REFUSE   2
 #define  EGPC_REQUEST  0
 #define  EGPC_CONFIRM  1
 #define  EGPC_REFUSE   2
@@ -59,7 +50,7 @@ struct egp_packet {
 #define  EGPC_CEASEACK 4
 #define  EGPC_HELLO    0
 #define  EGPC_HEARDU   1
 #define  EGPC_CEASEACK 4
 #define  EGPC_HELLO    0
 #define  EGPC_HEARDU   1
-       u_char  egp_status;
+       nd_uint8_t  egp_status;
 #define  EGPS_UNSPEC   0
 #define  EGPS_ACTIVE   1
 #define  EGPS_PASSIVE  2
 #define  EGPS_UNSPEC   0
 #define  EGPS_ACTIVE   1
 #define  EGPS_PASSIVE  2
@@ -72,13 +63,13 @@ struct egp_packet {
 #define  EGPS_UP       1
 #define  EGPS_DOWN     2
 #define  EGPS_UNSOL    0x80
 #define  EGPS_UP       1
 #define  EGPS_DOWN     2
 #define  EGPS_UNSOL    0x80
-       u_short  egp_checksum;
-       u_short  egp_as;
-       u_short  egp_sequence;
+       nd_uint16_t  egp_checksum;
+       nd_uint16_t  egp_as;
+       nd_uint16_t  egp_sequence;
        union {
        union {
-               u_short  egpu_hello;
-               u_char egpu_gws[2];
-               u_short  egpu_reason;
+               nd_uint16_t egpu_hello;
+               nd_uint8_t  egpu_gws[2];
+               nd_uint16_t egpu_reason;
 #define  EGPR_UNSPEC   0
 #define  EGPR_BADHEAD  1
 #define  EGPR_BADDATA  2
 #define  EGPR_UNSPEC   0
 #define  EGPR_BADHEAD  1
 #define  EGPR_BADDATA  2
@@ -92,65 +83,80 @@ struct egp_packet {
 #define  egp_extgw  egp_handg.egpu_gws[1]
 #define  egp_reason  egp_handg.egpu_reason
        union {
 #define  egp_extgw  egp_handg.egpu_gws[1]
 #define  egp_reason  egp_handg.egpu_reason
        union {
-               u_short  egpu_poll;
-               u_int32_t egpu_sourcenet;
+               nd_uint16_t egpu_poll;
+               nd_ipv4 egpu_sourcenet;
        } egp_pands;
 #define  egp_poll  egp_pands.egpu_poll
 #define  egp_sourcenet  egp_pands.egpu_sourcenet
 };
 
        } egp_pands;
 #define  egp_poll  egp_pands.egpu_poll
 #define  egp_sourcenet  egp_pands.egpu_sourcenet
 };
 
-const char *egp_acquire_codes[] = {
-       "request",
-       "confirm",
-       "refuse",
-       "cease",
-       "cease_ack"
+static const struct tok egp_type_str[] = {
+       { EGPT_ACQUIRE, "acquire" },
+       { EGPT_REACH,   "reach"   },
+       { EGPT_POLL,    "poll"    },
+       { EGPT_UPDATE,  "update"  },
+       { EGPT_ERROR,   "error"   },
+       { 0, NULL }
 };
 
 };
 
-const char *egp_acquire_status[] = {
-       "unspecified",
-       "active_mode",
-       "passive_mode",
-       "insufficient_resources",
-       "administratively_prohibited",
-       "going_down",
-       "parameter_violation",
-       "protocol_violation"
+static const struct tok egp_acquire_codes_str[] = {
+       { EGPC_REQUEST,  "request"   },
+       { EGPC_CONFIRM,  "confirm"   },
+       { EGPC_REFUSE,   "refuse"    },
+       { EGPC_CEASE,    "cease"     },
+       { EGPC_CEASEACK, "cease_ack" },
+       { 0, NULL }
 };
 
 };
 
-const char *egp_reach_codes[] = {
-       "hello",
-       "i-h-u"
+static const struct tok egp_acquire_status_str[] = {
+       { EGPS_UNSPEC,  "unspecified"                 },
+       { EGPS_ACTIVE,  "active_mode"                 },
+       { EGPS_PASSIVE, "passive_mode"                },
+       { EGPS_NORES,   "insufficient_resources"      },
+       { EGPS_ADMIN,   "administratively_prohibited" },
+       { EGPS_GODOWN,  "going_down"                  },
+       { EGPS_PARAM,   "parameter_violation"         },
+       { EGPS_PROTO,   "protocol_violation"          },
+       { 0, NULL }
 };
 
 };
 
-const char *egp_status_updown[] = {
-       "indeterminate",
-       "up",
-       "down"
+static const struct tok egp_reach_codes_str[] = {
+       { EGPC_HELLO,  "hello" },
+       { EGPC_HEARDU, "i-h-u" },
+       { 0, NULL }
 };
 
 };
 
-const char *egp_reasons[] = {
-       "unspecified",
-       "bad_EGP_header_format",
-       "bad_EGP_data_field_format",
-       "reachability_info_unavailable",
-       "excessive_polling_rate",
-       "no_response",
-       "unsupported_version"
+static const struct tok egp_status_updown_str[] = {
+       { EGPS_INDET, "indeterminate" },
+       { EGPS_UP,    "up"            },
+       { EGPS_DOWN,  "down"          },
+       { 0, NULL }
+};
+
+static const struct tok egp_reasons_str[] = {
+       { EGPR_UNSPEC,   "unspecified"                   },
+       { EGPR_BADHEAD,  "bad_EGP_header_format"         },
+       { EGPR_BADDATA,  "bad_EGP_data_field_format"     },
+       { EGPR_NOREACH,  "reachability_info_unavailable" },
+       { EGPR_XSPOLL,   "excessive_polling_rate"        },
+       { EGPR_NORESP,   "no_response"                   },
+       { EGPR_UVERSION, "unsupported_version"           },
+       { 0, NULL }
 };
 
 static void
 };
 
 static void
-egpnrprint(register const struct egp_packet *egp, register u_int length)
+egpnr_print(netdissect_options *ndo,
+           const struct egp_packet *egp, u_int length)
 {
 {
-       register const u_char *cp;
-       u_int32_t addr;
-       register u_int32_t net;
-       register u_int netlen;
-       int gateways, distances, networks;
-       int t_gateways;
-       char *comma;
-
-       addr = egp->egp_sourcenet;
+       const uint8_t *cp;
+       uint32_t addr;
+       uint32_t net;
+       u_int netlen;
+       u_int gateways, distances, networks;
+       u_int intgw, extgw, t_gateways;
+       const char *comma;
+
+       addr = GET_IPV4_TO_NETWORK_ORDER(egp->egp_sourcenet);
        if (IN_CLASSA(addr)) {
                net = addr & IN_CLASSA_NET;
                netlen = 1;
        if (IN_CLASSA(addr)) {
                net = addr & IN_CLASSA_NET;
                netlen = 1;
@@ -164,111 +170,152 @@ egpnrprint(register const struct egp_packet *egp, register u_int length)
                net = 0;
                netlen = 0;
        }
                net = 0;
                netlen = 0;
        }
-       cp = (u_char *)(egp + 1);
+       cp = (const uint8_t *)(egp + 1);
+       length -= sizeof(*egp);
 
 
-       t_gateways = egp->egp_intgw + egp->egp_extgw;
+       intgw = GET_U_1(egp->egp_intgw);
+       extgw = GET_U_1(egp->egp_extgw);
+       t_gateways = intgw + extgw;
        for (gateways = 0; gateways < t_gateways; ++gateways) {
                /* Pickup host part of gateway address */
                addr = 0;
        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 invalid;
+               ND_TCHECK_LEN(cp, 4 - netlen);
                switch (netlen) {
 
                case 1:
                switch (netlen) {
 
                case 1:
-                       addr = *cp++;
+                       addr = GET_U_1(cp);
+                       cp++;
                        /* fall through */
                case 2:
                        /* fall through */
                case 2:
-                       addr = (addr << 8) | *cp++;
+                       addr = (addr << 8) | GET_U_1(cp);
+                       cp++;
                        /* fall through */
                case 3:
                        /* fall through */
                case 3:
-                       addr = (addr << 8) | *cp++;
+                       addr = (addr << 8) | GET_U_1(cp);
+                       cp++;
+                       break;
                }
                addr |= net;
                }
                addr |= net;
-               TCHECK2(cp[0], 1);
-               distances = *cp++;
-               printf(" %s %s ",
-                      gateways < (int)egp->egp_intgw ? "int" : "ext",
-                      ipaddr_string(&addr));
+               length -= 4 - netlen;
+               if (length < 1)
+                       goto invalid;
+               distances = GET_U_1(cp);
+               cp++;
+               length--;
+               ND_PRINT(" %s %s ",
+                      gateways < intgw ? "int" : "ext",
+                      ipaddr_string(ndo, (const u_char *)&addr)); /* local buffer, not packet data; don't use GET_IPADDR_STRING() */
 
                comma = "";
 
                comma = "";
-               putchar('(');
-               while (--distances >= 0) {
-                       TCHECK2(cp[0], 2);
-                       printf("%sd%d:", comma, (int)*cp++);
+               ND_PRINT("(");
+               while (distances != 0) {
+                       if (length < 2)
+                               goto invalid;
+                       ND_PRINT("%sd%u:", comma, GET_U_1(cp));
+                       cp++;
                        comma = ", ";
                        comma = ", ";
-                       networks = *cp++;
-                       while (--networks >= 0) {
+                       networks = GET_U_1(cp);
+                       cp++;
+                       length -= 2;
+                       while (networks != 0) {
                                /* Pickup network number */
                                /* Pickup network number */
-                               TCHECK2(cp[0], 1);
-                               addr = (u_int32_t)*cp++ << 24;
+                               if (length < 1)
+                                       goto invalid;
+                               addr = ((uint32_t) GET_U_1(cp)) << 24;
+                               cp++;
+                               length--;
                                if (IN_CLASSB(addr)) {
                                if (IN_CLASSB(addr)) {
-                                       TCHECK2(cp[0], 1);
-                                       addr |= (u_int32_t)*cp++ << 16;
+                                       if (length < 1)
+                                               goto invalid;
+                                       addr |= ((uint32_t) GET_U_1(cp)) << 16;
+                                       cp++;
+                                       length--;
                                } else if (!IN_CLASSA(addr)) {
                                } 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 invalid;
+                                       addr |= ((uint32_t) GET_U_1(cp)) << 16;
+                                       cp++;
+                                       addr |= ((uint32_t) GET_U_1(cp)) << 8;
+                                       cp++;
+                                       length -= 2;
                                }
                                }
-                               printf(" %s", ipaddr_string(&addr));
+                               ND_PRINT(" %s", ipaddr_string(ndo, (const u_char *)&addr)); /* local buffer, not packet data; don't use GET_IPADDR_STRING() */
+                               networks--;
                        }
                        }
+                       distances--;
                }
                }
-               putchar(')');
+               ND_PRINT(")");
        }
        return;
        }
        return;
-trunc:
-       fputs("[|]", stdout);
+invalid:
+       nd_print_invalid(ndo);
 }
 
 void
 }
 
 void
-egp_print(register const u_char *bp, register u_int length,
-         register const u_char *bp2)
+egp_print(netdissect_options *ndo,
+          const uint8_t *bp, u_int length)
 {
 {
-       register const struct egp_packet *egp;
-       register const struct ip *ip;
-       register int status;
-       register int code;
-       register int type;
-
-       egp = (struct egp_packet *)bp;
-       ip = (struct ip *)bp2;
-       (void)printf("egp: ");
-
-       if (egp->egp_version != EGP_VERSION) {
-               printf("[version %d]", egp->egp_version);
+       const struct egp_packet *egp;
+       u_int version;
+       u_int type;
+       u_int code;
+       u_int status;
+
+       ndo->ndo_protocol = "egp";
+       egp = (const struct egp_packet *)bp;
+       ND_ICHECKMSG_ZU("packet length", length, <, sizeof(*egp));
+       ND_TCHECK_SIZE(egp);
+
+       version = GET_U_1(egp->egp_version);
+        if (!ndo->ndo_vflag) {
+            ND_PRINT("EGPv%u, AS %u, seq %u, length %u",
+                   version,
+                   GET_BE_U_2(egp->egp_as),
+                   GET_BE_U_2(egp->egp_sequence),
+                   length);
+            return;
+        } else
+            ND_PRINT("EGPv%u, length %u",
+                   version,
+                   length);
+
+       if (version != EGP_VERSION) {
+               ND_PRINT("[version %u]", version);
                return;
        }
                return;
        }
-       printf("as:%d seq:%d", ntohs(egp->egp_as), ntohs(egp->egp_sequence));
 
 
-       type = egp->egp_type;
-       code = egp->egp_code;
-       status = egp->egp_status;
+       type = GET_U_1(egp->egp_type);
+       ND_PRINT(" %s", tok2str(egp_type_str, "[type %u]", type));
+       code = GET_U_1(egp->egp_code);
+       status = GET_U_1(egp->egp_status);
 
        switch (type) {
        case EGPT_ACQUIRE:
 
        switch (type) {
        case EGPT_ACQUIRE:
-               printf(" acquire");
+               ND_PRINT(" %s", tok2str(egp_acquire_codes_str, "[code %u]", code));
                switch (code) {
                case EGPC_REQUEST:
                case EGPC_CONFIRM:
                switch (code) {
                case EGPC_REQUEST:
                case EGPC_CONFIRM:
-                       printf(" %s", egp_acquire_codes[code]);
                        switch (status) {
                        case EGPS_UNSPEC:
                        case EGPS_ACTIVE:
                        case EGPS_PASSIVE:
                        switch (status) {
                        case EGPS_UNSPEC:
                        case EGPS_ACTIVE:
                        case EGPS_PASSIVE:
-                               printf(" %s", egp_acquire_status[status]);
+                               ND_PRINT(" %s", tok2str(egp_acquire_status_str, "%u", status));
                                break;
 
                        default:
                                break;
 
                        default:
-                               printf(" [status %d]", status);
+                               ND_PRINT(" [status %u]", status);
                                break;
                        }
                                break;
                        }
-                       printf(" hello:%d poll:%d",
-                              ntohs(egp->egp_hello),
-                              ntohs(egp->egp_poll));
+                       ND_PRINT(" hello:%u poll:%u",
+                              GET_BE_U_2(egp->egp_hello),
+                              GET_BE_U_2(egp->egp_poll));
                        break;
 
                case EGPC_REFUSE:
                case EGPC_CEASE:
                case EGPC_CEASEACK:
                        break;
 
                case EGPC_REFUSE:
                case EGPC_CEASE:
                case EGPC_CEASEACK:
-                       printf(" %s", egp_acquire_codes[code]);
                        switch (status ) {
                        case EGPS_UNSPEC:
                        case EGPS_NORES:
                        switch (status ) {
                        case EGPS_UNSPEC:
                        case EGPS_NORES:
@@ -276,81 +323,52 @@ egp_print(register const u_char *bp, register u_int length,
                        case EGPS_GODOWN:
                        case EGPS_PARAM:
                        case EGPS_PROTO:
                        case EGPS_GODOWN:
                        case EGPS_PARAM:
                        case EGPS_PROTO:
-                               printf(" %s", egp_acquire_status[status]);
+                               ND_PRINT(" %s", tok2str(egp_acquire_status_str, "%u", status));
                                break;
 
                        default:
                                break;
 
                        default:
-                               printf("[status %d]", status);
+                               ND_PRINT("[status %u]", status);
                                break;
                        }
                        break;
                                break;
                        }
                        break;
-
-               default:
-                       printf("[code %d]", code);
-                       break;
                }
                break;
 
        case EGPT_REACH:
                }
                break;
 
        case EGPT_REACH:
+               ND_PRINT(" %s", tok2str(egp_reach_codes_str, "[reach code %u]", code));
                switch (code) {
                switch (code) {
-
                case EGPC_HELLO:
                case EGPC_HEARDU:
                case EGPC_HELLO:
                case EGPC_HEARDU:
-                       printf(" %s", egp_reach_codes[code]);
-                       if (status <= EGPS_DOWN)
-                               printf(" state:%s", egp_status_updown[status]);
-                       else
-                               printf(" [status %d]", status);
-                       break;
-
-               default:
-                       printf("[reach code %d]", code);
+                       ND_PRINT(" state:%s", tok2str(egp_status_updown_str, "%u", status));
                        break;
                }
                break;
 
        case EGPT_POLL:
                        break;
                }
                break;
 
        case EGPT_POLL:
-               printf(" poll");
-               if (egp->egp_status <= EGPS_DOWN)
-                       printf(" state:%s", egp_status_updown[status]);
-               else
-                       printf(" [status %d]", status);
-               printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
+               ND_PRINT(" state:%s", tok2str(egp_status_updown_str, "%u", status));
+               ND_PRINT(" net:%s", GET_IPADDR_STRING(egp->egp_sourcenet));
                break;
 
        case EGPT_UPDATE:
                break;
 
        case EGPT_UPDATE:
-               printf(" update");
                if (status & EGPS_UNSOL) {
                        status &= ~EGPS_UNSOL;
                if (status & EGPS_UNSOL) {
                        status &= ~EGPS_UNSOL;
-                       printf(" unsolicited");
+                       ND_PRINT(" unsolicited");
                }
                }
-               if (status <= EGPS_DOWN)
-                       printf(" state:%s", egp_status_updown[status]);
-               else
-                       printf(" [status %d]", status);
-               printf(" %s int %d ext %d",
-                      ipaddr_string(&egp->egp_sourcenet),
-                      egp->egp_intgw,
-                      egp->egp_extgw);
-               if (vflag)
-                       egpnrprint(egp, length);
+               ND_PRINT(" state:%s", tok2str(egp_status_updown_str, "%u", status));
+               ND_PRINT(" %s int %u ext %u",
+                      GET_IPADDR_STRING(egp->egp_sourcenet),
+                      GET_U_1(egp->egp_intgw),
+                      GET_U_1(egp->egp_extgw));
+               if (ndo->ndo_vflag)
+                       egpnr_print(ndo, egp, length);
                break;
 
        case EGPT_ERROR:
                break;
 
        case EGPT_ERROR:
-               printf(" error");
-               if (status <= EGPS_DOWN)
-                       printf(" state:%s", egp_status_updown[status]);
-               else
-                       printf(" [status %d]", status);
-
-               if (ntohs(egp->egp_reason) <= EGPR_UVERSION)
-                       printf(" %s", egp_reasons[ntohs(egp->egp_reason)]);
-               else
-                       printf(" [reason %d]", ntohs(egp->egp_reason));
-               break;
-
-       default:
-               printf("[type %d]", type);
+               ND_PRINT(" state:%s", tok2str(egp_status_updown_str, "%u", status));
+               ND_PRINT(" %s", tok2str(egp_reasons_str, "[reason %u]", GET_BE_U_2(egp->egp_reason)));
                break;
        }
                break;
        }
+       return;
+invalid:
+       nd_print_invalid(ndo);
 }
 }
[mirror] the TCPdump network dissector