The Tcpdump Group git mirrors - tcpdump/blob - 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 #define RRCP_OPCODE_MASK        0x7F    /* 0x00 = hello, 0x01 = get, 0x02 = set */
  44 #define RRCP_ISREPLY            0x80    /* 0 = request to switch, 0x80 = reply from switch */
  45
  46 #define RRCP_PROTO_OFFSET               0       /* proto - 1 byte, must be 1 */
  47 #define RRCP_OPCODE_ISREPLY_OFFSET      1       /* opcode and isreply flag - 1 byte */
  48 #define RRCP_AUTHKEY_OFFSET             2       /* authorization key - 2 bytes, 0x2379 by default */
  49
  50 /* most packets */
  51 #define RRCP_REG_ADDR_OFFSET            4       /* register address - 2 bytes */
  52 #define RRCP_REG_DATA_OFFSET            6       /* register data - 4 bytes */
  53 #define RRCP_COOKIE1_OFFSET             10      /* 4 bytes */
  54 #define RRCP_COOKIE2_OFFSET             14      /* 4 bytes */
  55
  56 /* hello reply packets */
  57 #define RRCP_DOWNLINK_PORT_OFFSET       4       /* 1 byte */
  58 #define RRCP_UPLINK_PORT_OFFSET         5       /* 1 byte */
  59 #define RRCP_UPLINK_MAC_OFFSET          6       /* 6 byte MAC address */
  60 #define RRCP_CHIP_ID_OFFSET             12      /* 2 bytes */
  61 #define RRCP_VENDOR_ID_OFFSET           14      /* 4 bytes */
  62
  63 static const struct tok proto_values[] = {
  64         { 1, "RRCP" },
  65         { 2, "RRCP-REP" },
  66         { 0, NULL }
  67 };
  68
  69 static const struct tok opcode_values[] = {
  70         { 0, "hello" },
  71         { 1, "get" },
  72         { 2, "set" },
  73         { 0, NULL }
  74 };
  75
  76 /*
  77  * Print RRCP requests
  78  */
  79 void
  80 rrcp_print(netdissect_options *ndo,
  81           register const u_char *cp,
  82           u_int length _U_)
  83 {
  84         const u_char *rrcp;
  85         u_int8_t rrcp_proto;
  86         u_int8_t rrcp_opcode;
  87         register const struct ether_header *ep;
  88         char proto_str[16];
  89         char opcode_str[32];
  90
  91         ep = (const struct ether_header *)cp;
  92         rrcp = cp + ETHER_HDRLEN;
  93
  94         ND_TCHECK(*(rrcp + RRCP_PROTO_OFFSET));
  95         rrcp_proto = *(rrcp + RRCP_PROTO_OFFSET);
  96         ND_TCHECK(*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET));
  97         rrcp_opcode = (*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_OPCODE_MASK;
  98         ND_PRINT((ndo, "%s > %s, %s %s",
  99                 etheraddr_string(ESRC(ep)),
 100                 etheraddr_string(EDST(ep)),
 101                 tok2strbuf(proto_values,"RRCP-0x%02x",rrcp_proto,proto_str,sizeof(proto_str)),
 102                 ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY) ? "reply" : "query"));
 103         if (rrcp_proto==1){
 104             ND_PRINT((ndo, ": %s",
 105                      tok2strbuf(opcode_values,"unknown opcode (0x%02x)",rrcp_opcode,opcode_str,sizeof(opcode_str))));
 106         }
 107         if (rrcp_opcode==1 || rrcp_opcode==2){
 108             ND_TCHECK2(*(rrcp + RRCP_REG_ADDR_OFFSET), 6);
 109             ND_PRINT((ndo, " addr=0x%04x, data=0x%08x",
 110                      EXTRACT_LE_16BITS(rrcp + RRCP_REG_ADDR_OFFSET),
 111                      EXTRACT_LE_32BITS(rrcp + RRCP_REG_DATA_OFFSET)));
 112         }
 113         if (rrcp_proto==1){
 114             ND_TCHECK2(*(rrcp + RRCP_AUTHKEY_OFFSET), 2);
 115             ND_PRINT((ndo, ", auth=0x%04x",
 116                   EXTRACT_16BITS(rrcp + RRCP_AUTHKEY_OFFSET)));
 117         }
 118         if (rrcp_proto==1 && rrcp_opcode==0 &&
 119              ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY)){
 120             ND_TCHECK2(*(rrcp + RRCP_VENDOR_ID_OFFSET), 4);
 121             ND_PRINT((ndo, " downlink_port=%d, uplink_port=%d, uplink_mac=%s, vendor_id=%08x ,chip_id=%04x ",
 122                      *(rrcp + RRCP_DOWNLINK_PORT_OFFSET),
 123                      *(rrcp + RRCP_UPLINK_PORT_OFFSET),
 124                      etheraddr_string(rrcp + RRCP_UPLINK_MAC_OFFSET),
 125                      EXTRACT_32BITS(rrcp + RRCP_VENDOR_ID_OFFSET),
 126                      EXTRACT_16BITS(rrcp + RRCP_CHIP_ID_OFFSET)));
 127         }else if (rrcp_opcode==1 || rrcp_opcode==2 || rrcp_proto==2){
 128             ND_TCHECK2(*(rrcp + RRCP_COOKIE2_OFFSET), 4);
 129             ND_PRINT((ndo, ", cookie=0x%08x%08x ",
 130                     EXTRACT_32BITS(rrcp + RRCP_COOKIE2_OFFSET),
 131                     EXTRACT_32BITS(rrcp + RRCP_COOKIE1_OFFSET)));
 132         }
 133         if (!ndo->ndo_vflag)
 134             return;
 135         return;
 136
 137 trunc:
 138         ND_PRINT((ndo, "[|rrcp]"));
 139 }