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 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include "netdissect.h"
  31 #include "addrtoname.h"
  32 #include "extract.h"
  33 #include "ether.h"
  34
  35 #define RRCP_OPCODE_MASK        0x7F    /* 0x00 = hello, 0x01 = get, 0x02 = set */
  36 #define RRCP_ISREPLY            0x80    /* 0 = request to switch, 0x80 = reply from switch */
  37
  38 #define RRCP_PROTO_OFFSET               0       /* proto - 1 byte, must be 1 */
  39 #define RRCP_OPCODE_ISREPLY_OFFSET      1       /* opcode and isreply flag - 1 byte */
  40 #define RRCP_AUTHKEY_OFFSET             2       /* authorization key - 2 bytes, 0x2379 by default */
  41
  42 /* most packets */
  43 #define RRCP_REG_ADDR_OFFSET            4       /* register address - 2 bytes */
  44 #define RRCP_REG_DATA_OFFSET            6       /* register data - 4 bytes */
  45 #define RRCP_COOKIE1_OFFSET             10      /* 4 bytes */
  46 #define RRCP_COOKIE2_OFFSET             14      /* 4 bytes */
  47
  48 /* hello reply packets */
  49 #define RRCP_DOWNLINK_PORT_OFFSET       4       /* 1 byte */
  50 #define RRCP_UPLINK_PORT_OFFSET         5       /* 1 byte */
  51 #define RRCP_UPLINK_MAC_OFFSET          6       /* 6 byte MAC address */
  52 #define RRCP_CHIP_ID_OFFSET             12      /* 2 bytes */
  53 #define RRCP_VENDOR_ID_OFFSET           14      /* 4 bytes */
  54
  55 static const struct tok proto_values[] = {
  56         { 1, "RRCP" },
  57         { 2, "RRCP-REP" },
  58         { 0, NULL }
  59 };
  60
  61 static const struct tok opcode_values[] = {
  62         { 0, "hello" },
  63         { 1, "get" },
  64         { 2, "set" },
  65         { 0, NULL }
  66 };
  67
  68 /*
  69  * Print RRCP requests
  70  */
  71 void
  72 rrcp_print(netdissect_options *ndo,
  73           register const u_char *cp,
  74           u_int length _U_)
  75 {
  76         const u_char *rrcp;
  77         uint8_t rrcp_proto;
  78         uint8_t rrcp_opcode;
  79         register const struct ether_header *ep;
  80
  81         ep = (const struct ether_header *)cp;
  82         rrcp = cp + ETHER_HDRLEN;
  83
  84         ND_TCHECK(*(rrcp + RRCP_PROTO_OFFSET));
  85         rrcp_proto = *(rrcp + RRCP_PROTO_OFFSET);
  86         ND_TCHECK(*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET));
  87         rrcp_opcode = (*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_OPCODE_MASK;
  88         ND_PRINT((ndo, "%s > %s, %s %s",
  89                 etheraddr_string(ndo, ESRC(ep)),
  90                 etheraddr_string(ndo, EDST(ep)),
  91                 tok2str(proto_values,"RRCP-0x%02x",rrcp_proto),
  92                 ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY) ? "reply" : "query"));
  93         if (rrcp_proto==1){
  94             ND_PRINT((ndo, ": %s",
  95                      tok2str(opcode_values,"unknown opcode (0x%02x)",rrcp_opcode)));
  96         }
  97         if (rrcp_opcode==1 || rrcp_opcode==2){
  98             ND_TCHECK2(*(rrcp + RRCP_REG_ADDR_OFFSET), 6);
  99             ND_PRINT((ndo, " addr=0x%04x, data=0x%08x",
 100                      EXTRACT_LE_16BITS(rrcp + RRCP_REG_ADDR_OFFSET),
 101                      EXTRACT_LE_32BITS(rrcp + RRCP_REG_DATA_OFFSET)));
 102         }
 103         if (rrcp_proto==1){
 104             ND_TCHECK2(*(rrcp + RRCP_AUTHKEY_OFFSET), 2);
 105             ND_PRINT((ndo, ", auth=0x%04x",
 106                   EXTRACT_16BITS(rrcp + RRCP_AUTHKEY_OFFSET)));
 107         }
 108         if (rrcp_proto==1 && rrcp_opcode==0 &&
 109              ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY)){
 110             ND_TCHECK2(*(rrcp + RRCP_VENDOR_ID_OFFSET), 4);
 111             ND_PRINT((ndo, " downlink_port=%d, uplink_port=%d, uplink_mac=%s, vendor_id=%08x ,chip_id=%04x ",
 112                      *(rrcp + RRCP_DOWNLINK_PORT_OFFSET),
 113                      *(rrcp + RRCP_UPLINK_PORT_OFFSET),
 114                      etheraddr_string(ndo, rrcp + RRCP_UPLINK_MAC_OFFSET),
 115                      EXTRACT_32BITS(rrcp + RRCP_VENDOR_ID_OFFSET),
 116                      EXTRACT_16BITS(rrcp + RRCP_CHIP_ID_OFFSET)));
 117         }else if (rrcp_opcode==1 || rrcp_opcode==2 || rrcp_proto==2){
 118             ND_TCHECK2(*(rrcp + RRCP_COOKIE2_OFFSET), 4);
 119             ND_PRINT((ndo, ", cookie=0x%08x%08x ",
 120                     EXTRACT_32BITS(rrcp + RRCP_COOKIE2_OFFSET),
 121                     EXTRACT_32BITS(rrcp + RRCP_COOKIE1_OFFSET)));
 122         }
 123         return;
 124
 125 trunc:
 126         ND_PRINT((ndo, "[|rrcp]"));
 127 }