contrib/tcpdump/print-rrcp.c

   1 /*
   2  * Copyright (c) 2007 - Andrey "nording" Chernyak <andrew@nording.ru>
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that: (1) source code distributions
   6  * retain the above copyright notice and this paragraph in its entirety, (2)
   7  * distributions including binary code include the above copyright notice and
   8  * this paragraph in its entirety in the documentation or other materials
   9  * provided with the distribution, and (3) all advertising materials mentioning
  10  * features or use of this software display the following acknowledgement:
  11  * ``This product includes software developed by the University of California,
  12  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  13  * the University nor the names of its contributors may be used to endorse
  14  * or promote products derived from this software without specific prior
  15  * written permission.
  16  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  17  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  19  *
  20  * Format and print Realtek Remote Control Protocol (RRCP)
  21  * and Realtek Echo Protocol (RRCP-REP) packets.
  22  */
  23
  24 #ifndef lint
  25 static const char rcsid[] _U_ =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-rrcp.c,v 1.2 2008-04-11 17:21:34 gianluca Exp $";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #include <stdio.h>
  36 #include <string.h>
  37
  38 #include "netdissect.h"
  39 #include "addrtoname.h"
  40 #include "extract.h"
  41 #include "ether.h"
  42
  43 #ifndef ETH_ALEN
  44 #define ETH_ALEN 6
  45 #endif
  46
  47 #define RRCP_OPCODE_MASK        0x7F    /* 0x00 = hello, 0x01 = get, 0x02 = set */
  48 #define RRCP_ISREPLY            0x80    /* 0 = request to switch, 0x80 = reply from switch */
  49
  50 #define RRCP_PROTO_OFFSET               0       /* proto - 1 byte, must be 1 */
  51 #define RRCP_OPCODE_ISREPLY_OFFSET      1       /* opcode and isreply flag - 1 byte */
  52 #define RRCP_AUTHKEY_OFFSET             2       /* authorization key - 2 bytes, 0x2379 by default */
  53
  54 /* most packets */
  55 #define RRCP_REG_ADDR_OFFSET            4       /* register address - 2 bytes */
  56 #define RRCP_REG_DATA_OFFSET            6       /* register data - 4 bytes */
  57 #define RRCP_COOKIE1_OFFSET             10      /* 4 bytes */
  58 #define RRCP_COOKIE2_OFFSET             14      /* 4 bytes */
  59
  60 /* hello reply packets */
  61 #define RRCP_DOWNLINK_PORT_OFFSET       4       /* 1 byte */
  62 #define RRCP_UPLINK_PORT_OFFSET         5       /* 1 byte */
  63 #define RRCP_UPLINK_MAC_OFFSET          6       /* 6 byte MAC address */
  64 #define RRCP_CHIP_ID_OFFSET             12      /* 2 bytes */
  65 #define RRCP_VENDOR_ID_OFFSET           14      /* 4 bytes */
  66
  67 static const struct tok proto_values[] = {
  68         { 1, "RRCP" },
  69         { 2, "RRCP-REP" },
  70         { 0, NULL }
  71 };
  72
  73 static const struct tok opcode_values[] = {
  74         { 0, "hello" },
  75         { 1, "get" },
  76         { 2, "set" },
  77         { 0, NULL }
  78 };
  79
  80 /*
  81  * Print RRCP requests
  82  */
  83 void
  84 rrcp_print(netdissect_options *ndo,
  85           register const u_char *cp,
  86           u_int length _U_)
  87 {
  88         const u_char *rrcp;
  89         u_int8_t rrcp_proto;
  90         u_int8_t rrcp_opcode;
  91         register const struct ether_header *ep;
  92         char proto_str[16];
  93         char opcode_str[32];
  94
  95         ep = (const struct ether_header *)cp;
  96         rrcp = cp + ETHER_HDRLEN;
  97
  98         ND_TCHECK(*(rrcp + RRCP_PROTO_OFFSET));
  99         rrcp_proto = *(rrcp + RRCP_PROTO_OFFSET);
 100         ND_TCHECK(*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET));
 101         rrcp_opcode = (*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_OPCODE_MASK;
 102         ND_PRINT((ndo, "%s > %s, %s %s",
 103                 etheraddr_string(ESRC(ep)),
 104                 etheraddr_string(EDST(ep)),
 105                 tok2strbuf(proto_values,"RRCP-0x%02x",rrcp_proto,proto_str,sizeof(proto_str)),
 106                 ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY) ? "reply" : "query"));
 107         if (rrcp_proto==1){
 108             ND_PRINT((ndo, ": %s",
 109                      tok2strbuf(opcode_values,"unknown opcode (0x%02x)",rrcp_opcode,opcode_str,sizeof(opcode_str))));
 110         }
 111         if (rrcp_opcode==1 || rrcp_opcode==2){
 112             ND_TCHECK2(*(rrcp + RRCP_REG_ADDR_OFFSET), 6);
 113             ND_PRINT((ndo, " addr=0x%04x, data=0x%08x",
 114                      EXTRACT_LE_16BITS(rrcp + RRCP_REG_ADDR_OFFSET),
 115                      EXTRACT_LE_32BITS(rrcp + RRCP_REG_DATA_OFFSET)));
 116         }
 117         if (rrcp_proto==1){
 118             ND_TCHECK2(*(rrcp + RRCP_AUTHKEY_OFFSET), 2);
 119             ND_PRINT((ndo, ", auth=0x%04x",
 120                   EXTRACT_16BITS(rrcp + RRCP_AUTHKEY_OFFSET)));
 121         }
 122         if (rrcp_proto==1 && rrcp_opcode==0 &&
 123              ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY)){
 124             ND_TCHECK2(*(rrcp + RRCP_VENDOR_ID_OFFSET), 4);
 125             ND_PRINT((ndo, " downlink_port=%d, uplink_port=%d, uplink_mac=%s, vendor_id=%08x ,chip_id=%04x ",
 126                      *(rrcp + RRCP_DOWNLINK_PORT_OFFSET),
 127                      *(rrcp + RRCP_UPLINK_PORT_OFFSET),
 128                      etheraddr_string(rrcp + RRCP_UPLINK_MAC_OFFSET),
 129                      EXTRACT_32BITS(rrcp + RRCP_VENDOR_ID_OFFSET),
 130                      EXTRACT_16BITS(rrcp + RRCP_CHIP_ID_OFFSET)));
 131         }else if (rrcp_opcode==1 || rrcp_opcode==2 || rrcp_proto==2){
 132             ND_TCHECK2(*(rrcp + RRCP_COOKIE2_OFFSET), 4);
 133             ND_PRINT((ndo, ", cookie=0x%08x%08x ",
 134                     EXTRACT_32BITS(rrcp + RRCP_COOKIE2_OFFSET),
 135                     EXTRACT_32BITS(rrcp + RRCP_COOKIE1_OFFSET)));
 136         }
 137         if (!ndo->ndo_vflag)
 138             return;
 139         return;
 140
 141 trunc:
 142         ND_PRINT((ndo, "[|rrcp]"));
 143 }