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 } 137