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 /* \summary: Realtek Remote Control Protocol (RRCP) printer */
  25
  26 /*
  27  * See, for example, section 8.20 "Realtek Remote Control Protocol" of
  28  *
  29  *    http://realtek.info/pdf/rtl8324.pdf
  30  *
  31  * and section 7.22 "Realtek Remote Control Protocol" of
  32  *
  33  *    http://realtek.info/pdf/rtl8326.pdf
  34  *
  35  * and this page on the OpenRRCP Wiki:
  36  *
  37  *    http://openrrcp.org.ru/wiki/rrcp_protocol
  38  *
  39  * NOTE: none of them indicate the byte order of multi-byte fields in any
  40  * obvious fashion.
  41  */
  42
  43 #ifdef HAVE_CONFIG_H
  44 #include <config.h>
  45 #endif
  46
  47 #include "netdissect-stdinc.h"
  48
  49 #include "netdissect.h"
  50 #include "addrtoname.h"
  51 #include "extract.h"
  52
  53 #define RRCP_OPCODE_MASK        0x7F    /* 0x00 = hello, 0x01 = get, 0x02 = set */
  54 #define RRCP_ISREPLY            0x80    /* 0 = request to switch, 0x80 = reply from switch */
  55
  56 #define RRCP_PROTO_OFFSET               0       /* proto - 1 byte, must be 1 */
  57 #define RRCP_OPCODE_ISREPLY_OFFSET      1       /* opcode and isreply flag - 1 byte */
  58 #define RRCP_AUTHKEY_OFFSET             2       /* authorization key - 2 bytes, 0x2379 by default */
  59
  60 /* most packets */
  61 #define RRCP_REG_ADDR_OFFSET            4       /* register address - 2 bytes */
  62 #define RRCP_REG_DATA_OFFSET            6       /* register data - 4 bytes */
  63 #define RRCP_COOKIE1_OFFSET             10      /* 4 bytes */
  64 #define RRCP_COOKIE2_OFFSET             14      /* 4 bytes */
  65
  66 /* hello reply packets */
  67 #define RRCP_DOWNLINK_PORT_OFFSET       4       /* 1 byte */
  68 #define RRCP_UPLINK_PORT_OFFSET         5       /* 1 byte */
  69 #define RRCP_UPLINK_MAC_OFFSET          6       /* 6 byte MAC address */
  70 #define RRCP_CHIP_ID_OFFSET             12      /* 2 bytes */
  71 #define RRCP_VENDOR_ID_OFFSET           14      /* 4 bytes */
  72
  73 static const struct tok proto_values[] = {
  74         { 1, "RRCP" },
  75         { 2, "RRCP-REP" },
  76         { 0, NULL }
  77 };
  78
  79 static const struct tok opcode_values[] = {
  80         { 0, "hello" },
  81         { 1, "get" },
  82         { 2, "set" },
  83         { 0, NULL }
  84 };
  85
  86 /*
  87  * Print RRCP requests
  88  */
  89 void
  90 rrcp_print(netdissect_options *ndo,
  91           const u_char *cp,
  92           u_int length _U_,
  93           const struct lladdr_info *src,
  94           const struct lladdr_info *dst)
  95 {
  96         uint8_t rrcp_proto;
  97         uint8_t rrcp_opcode;
  98
  99         ndo->ndo_protocol = "rrcp";
 100         rrcp_proto = GET_U_1(cp + RRCP_PROTO_OFFSET);
 101         rrcp_opcode = GET_U_1((cp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_OPCODE_MASK;
 102         if (src != NULL && dst != NULL) {
 103                 ND_PRINT("%s > %s, ",
 104                         (src->addr_string)(ndo, src->addr),
 105                         (dst->addr_string)(ndo, dst->addr));
 106         }
 107         ND_PRINT("%s %s",
 108                 tok2str(proto_values,"RRCP-0x%02x",rrcp_proto),
 109                 ((GET_U_1(cp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY) ? "reply" : "query");
 110         if (rrcp_proto==1){
 111             ND_PRINT(": %s",
 112                      tok2str(opcode_values,"unknown opcode (0x%02x)",rrcp_opcode));
 113         }
 114         if (rrcp_opcode==1 || rrcp_opcode==2){
 115             ND_PRINT(" addr=0x%04x, data=0x%08x",
 116                      GET_LE_U_2(cp + RRCP_REG_ADDR_OFFSET),
 117                      GET_LE_U_4(cp + RRCP_REG_DATA_OFFSET));
 118         }
 119         if (rrcp_proto==1){
 120             ND_PRINT(", auth=0x%04x",
 121                   GET_BE_U_2(cp + RRCP_AUTHKEY_OFFSET));
 122         }
 123         if (rrcp_proto==1 && rrcp_opcode==0 &&
 124              ((GET_U_1(cp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY)){
 125             ND_PRINT(" downlink_port=%u, uplink_port=%u, uplink_mac=%s, vendor_id=%08x ,chip_id=%04x ",
 126                      GET_U_1(cp + RRCP_DOWNLINK_PORT_OFFSET),
 127                      GET_U_1(cp + RRCP_UPLINK_PORT_OFFSET),
 128                      GET_ETHERADDR_STRING(cp + RRCP_UPLINK_MAC_OFFSET),
 129                      GET_BE_U_4(cp + RRCP_VENDOR_ID_OFFSET),
 130                      GET_BE_U_2(cp + RRCP_CHIP_ID_OFFSET));
 131         }else if (rrcp_opcode==1 || rrcp_opcode==2 || rrcp_proto==2){
 132             ND_PRINT(", cookie=0x%08x%08x ",
 133                     GET_BE_U_4(cp + RRCP_COOKIE2_OFFSET),
 134                     GET_BE_U_4(cp + RRCP_COOKIE1_OFFSET));
 135         }
 136 }