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1 office 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 uint8_t rrcp_proto;
79 uint8_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 }