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 #define NETDISSECT_REWORKED
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include "interface.h"
  32 #include "addrtoname.h"
  33 #include "extract.h"
  34 #include "ether.h"
  35
  36 #define RRCP_OPCODE_MASK        0x7F    /* 0x00 = hello, 0x01 = get, 0x02 = set */
  37 #define RRCP_ISREPLY            0x80    /* 0 = request to switch, 0x80 = reply from switch */
  38
  39 #define RRCP_PROTO_OFFSET               0       /* proto - 1 byte, must be 1 */
  40 #define RRCP_OPCODE_ISREPLY_OFFSET      1       /* opcode and isreply flag - 1 byte */
  41 #define RRCP_AUTHKEY_OFFSET             2       /* authorization key - 2 bytes, 0x2379 by default */
  42
  43 /* most packets */
  44 #define RRCP_REG_ADDR_OFFSET            4       /* register address - 2 bytes */
  45 #define RRCP_REG_DATA_OFFSET            6       /* register data - 4 bytes */
  46 #define RRCP_COOKIE1_OFFSET             10      /* 4 bytes */
  47 #define RRCP_COOKIE2_OFFSET             14      /* 4 bytes */
  48
  49 /* hello reply packets */
  50 #define RRCP_DOWNLINK_PORT_OFFSET       4       /* 1 byte */
  51 #define RRCP_UPLINK_PORT_OFFSET         5       /* 1 byte */
  52 #define RRCP_UPLINK_MAC_OFFSET          6       /* 6 byte MAC address */
  53 #define RRCP_CHIP_ID_OFFSET             12      /* 2 bytes */
  54 #define RRCP_VENDOR_ID_OFFSET           14      /* 4 bytes */
  55
  56 static const struct tok proto_values[] = {
  57         { 1, "RRCP" },
  58         { 2, "RRCP-REP" },
  59         { 0, NULL }
  60 };
  61
  62 static const struct tok opcode_values[] = {
  63         { 0, "hello" },
  64         { 1, "get" },
  65         { 2, "set" },
  66         { 0, NULL }
  67 };
  68
  69 /*
  70  * Print RRCP requests
  71  */
  72 void
  73 rrcp_print(netdissect_options *ndo,
  74           register const u_char *cp,
  75           u_int length _U_)
  76 {
  77         const u_char *rrcp;
  78         u_int8_t rrcp_proto;
  79         u_int8_t rrcp_opcode;
  80         register const struct ether_header *ep;
  81         char proto_str[16];
  82         char opcode_str[32];
  83
  84         ep = (const struct ether_header *)cp;
  85         rrcp = cp + ETHER_HDRLEN;
  86
  87         ND_TCHECK(*(rrcp + RRCP_PROTO_OFFSET));
  88         rrcp_proto = *(rrcp + RRCP_PROTO_OFFSET);
  89         ND_TCHECK(*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET));
  90         rrcp_opcode = (*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_OPCODE_MASK;
  91         ND_PRINT((ndo, "%s > %s, %s %s",
  92                 etheraddr_string(ndo, ESRC(ep)),
  93                 etheraddr_string(ndo, EDST(ep)),
  94                 tok2strbuf(proto_values,"RRCP-0x%02x",rrcp_proto,proto_str,sizeof(proto_str)),
  95                 ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY) ? "reply" : "query"));
  96         if (rrcp_proto==1){
  97             ND_PRINT((ndo, ": %s",
  98                      tok2strbuf(opcode_values,"unknown opcode (0x%02x)",rrcp_opcode,opcode_str,sizeof(opcode_str))));
  99         }
 100         if (rrcp_opcode==1 || rrcp_opcode==2){
 101             ND_TCHECK2(*(rrcp + RRCP_REG_ADDR_OFFSET), 6);
 102             ND_PRINT((ndo, " addr=0x%04x, data=0x%08x",
 103                      EXTRACT_LE_16BITS(rrcp + RRCP_REG_ADDR_OFFSET),
 104                      EXTRACT_LE_32BITS(rrcp + RRCP_REG_DATA_OFFSET)));
 105         }
 106         if (rrcp_proto==1){
 107             ND_TCHECK2(*(rrcp + RRCP_AUTHKEY_OFFSET), 2);
 108             ND_PRINT((ndo, ", auth=0x%04x",
 109                   EXTRACT_16BITS(rrcp + RRCP_AUTHKEY_OFFSET)));
 110         }
 111         if (rrcp_proto==1 && rrcp_opcode==0 &&
 112              ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY)){
 113             ND_TCHECK2(*(rrcp + RRCP_VENDOR_ID_OFFSET), 4);
 114             ND_PRINT((ndo, " downlink_port=%d, uplink_port=%d, uplink_mac=%s, vendor_id=%08x ,chip_id=%04x ",
 115                      *(rrcp + RRCP_DOWNLINK_PORT_OFFSET),
 116                      *(rrcp + RRCP_UPLINK_PORT_OFFSET),
 117                      etheraddr_string(ndo, rrcp + RRCP_UPLINK_MAC_OFFSET),
 118                      EXTRACT_32BITS(rrcp + RRCP_VENDOR_ID_OFFSET),
 119                      EXTRACT_16BITS(rrcp + RRCP_CHIP_ID_OFFSET)));
 120         }else if (rrcp_opcode==1 || rrcp_opcode==2 || rrcp_proto==2){
 121             ND_TCHECK2(*(rrcp + RRCP_COOKIE2_OFFSET), 4);
 122             ND_PRINT((ndo, ", cookie=0x%08x%08x ",
 123                     EXTRACT_32BITS(rrcp + RRCP_COOKIE2_OFFSET),
 124                     EXTRACT_32BITS(rrcp + RRCP_COOKIE1_OFFSET)));
 125         }
 126         return;
 127
 128 trunc:
 129         ND_PRINT((ndo, "[|rrcp]"));
 130 }