external/bsd/tcpdump/dist/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 #include <sys/cdefs.h>
  25 #ifndef lint
  26 __RCSID("$NetBSD: print-rrcp.c,v 1.4 2014/11/20 03:05:03 christos Exp $");
  27 #endif
  28
  29 #define NETDISSECT_REWORKED
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include <tcpdump-stdinc.h>
  35
  36 #include "interface.h"
  37 #include "addrtoname.h"
  38 #include "extract.h"
  39 #include "ether.h"
  40
  41 #define RRCP_OPCODE_MASK        0x7F    /* 0x00 = hello, 0x01 = get, 0x02 = set */
  42 #define RRCP_ISREPLY            0x80    /* 0 = request to switch, 0x80 = reply from switch */
  43
  44 #define RRCP_PROTO_OFFSET               0       /* proto - 1 byte, must be 1 */
  45 #define RRCP_OPCODE_ISREPLY_OFFSET      1       /* opcode and isreply flag - 1 byte */
  46 #define RRCP_AUTHKEY_OFFSET             2       /* authorization key - 2 bytes, 0x2379 by default */
  47
  48 /* most packets */
  49 #define RRCP_REG_ADDR_OFFSET            4       /* register address - 2 bytes */
  50 #define RRCP_REG_DATA_OFFSET            6       /* register data - 4 bytes */
  51 #define RRCP_COOKIE1_OFFSET             10      /* 4 bytes */
  52 #define RRCP_COOKIE2_OFFSET             14      /* 4 bytes */
  53
  54 /* hello reply packets */
  55 #define RRCP_DOWNLINK_PORT_OFFSET       4       /* 1 byte */
  56 #define RRCP_UPLINK_PORT_OFFSET         5       /* 1 byte */
  57 #define RRCP_UPLINK_MAC_OFFSET          6       /* 6 byte MAC address */
  58 #define RRCP_CHIP_ID_OFFSET             12      /* 2 bytes */
  59 #define RRCP_VENDOR_ID_OFFSET           14      /* 4 bytes */
  60
  61 static const struct tok proto_values[] = {
  62         { 1, "RRCP" },
  63         { 2, "RRCP-REP" },
  64         { 0, NULL }
  65 };
  66
  67 static const struct tok opcode_values[] = {
  68         { 0, "hello" },
  69         { 1, "get" },
  70         { 2, "set" },
  71         { 0, NULL }
  72 };
  73
  74 /*
  75  * Print RRCP requests
  76  */
  77 void
  78 rrcp_print(netdissect_options *ndo,
  79           register const u_char *cp,
  80           u_int length _U_)
  81 {
  82         const u_char *rrcp;
  83         uint8_t rrcp_proto;
  84         uint8_t rrcp_opcode;
  85         register const struct ether_header *ep;
  86         char proto_str[16];
  87         char opcode_str[32];
  88
  89         ep = (const struct ether_header *)cp;
  90         rrcp = cp + ETHER_HDRLEN;
  91
  92         ND_TCHECK(*(rrcp + RRCP_PROTO_OFFSET));
  93         rrcp_proto = *(rrcp + RRCP_PROTO_OFFSET);
  94         ND_TCHECK(*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET));
  95         rrcp_opcode = (*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_OPCODE_MASK;
  96         ND_PRINT((ndo, "%s > %s, %s %s",
  97                 etheraddr_string(ndo, ESRC(ep)),
  98                 etheraddr_string(ndo, EDST(ep)),
  99                 tok2strbuf(proto_values,"RRCP-0x%02x",rrcp_proto,proto_str,sizeof(proto_str)),
 100                 ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY) ? "reply" : "query"));
 101         if (rrcp_proto==1){
 102             ND_PRINT((ndo, ": %s",
 103                      tok2strbuf(opcode_values,"unknown opcode (0x%02x)",rrcp_opcode,opcode_str,sizeof(opcode_str))));
 104         }
 105         if (rrcp_opcode==1 || rrcp_opcode==2){
 106             ND_TCHECK2(*(rrcp + RRCP_REG_ADDR_OFFSET), 6);
 107             ND_PRINT((ndo, " addr=0x%04x, data=0x%08x",
 108                      EXTRACT_LE_16BITS(rrcp + RRCP_REG_ADDR_OFFSET),
 109                      EXTRACT_LE_32BITS(rrcp + RRCP_REG_DATA_OFFSET)));
 110         }
 111         if (rrcp_proto==1){
 112             ND_TCHECK2(*(rrcp + RRCP_AUTHKEY_OFFSET), 2);
 113             ND_PRINT((ndo, ", auth=0x%04x",
 114                   EXTRACT_16BITS(rrcp + RRCP_AUTHKEY_OFFSET)));
 115         }
 116         if (rrcp_proto==1 && rrcp_opcode==0 &&
 117              ((*(rrcp + RRCP_OPCODE_ISREPLY_OFFSET)) & RRCP_ISREPLY)){
 118             ND_TCHECK2(*(rrcp + RRCP_VENDOR_ID_OFFSET), 4);
 119             ND_PRINT((ndo, " downlink_port=%d, uplink_port=%d, uplink_mac=%s, vendor_id=%08x ,chip_id=%04x ",
 120                      *(rrcp + RRCP_DOWNLINK_PORT_OFFSET),
 121                      *(rrcp + RRCP_UPLINK_PORT_OFFSET),
 122                      etheraddr_string(ndo, rrcp + RRCP_UPLINK_MAC_OFFSET),
 123                      EXTRACT_32BITS(rrcp + RRCP_VENDOR_ID_OFFSET),
 124                      EXTRACT_16BITS(rrcp + RRCP_CHIP_ID_OFFSET)));
 125         }else if (rrcp_opcode==1 || rrcp_opcode==2 || rrcp_proto==2){
 126             ND_TCHECK2(*(rrcp + RRCP_COOKIE2_OFFSET), 4);
 127             ND_PRINT((ndo, ", cookie=0x%08x%08x ",
 128                     EXTRACT_32BITS(rrcp + RRCP_COOKIE2_OFFSET),
 129                     EXTRACT_32BITS(rrcp + RRCP_COOKIE1_OFFSET)));
 130         }
 131         return;
 132
 133 trunc:
 134         ND_PRINT((ndo, "[|rrcp]"));
 135 }