1 /*
2 * Copyright (c) 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * Contributed by Brad Parker (brad@fcr.com).
22 */
23
24 /* \summary: Novell IPX printer */
25
26 #include <config.h>
27
28 #include "netdissect-stdinc.h"
29
30 #include <stdio.h>
31
32 #define ND_LONGJMP_FROM_TCHECK
33 #include "netdissect.h"
34 #include "addrtoname.h"
35 #include "extract.h"
36
37 /* well-known sockets */
38 #define IPX_SKT_NCP 0x0451
39 #define IPX_SKT_SAP 0x0452
40 #define IPX_SKT_RIP 0x0453
41 #define IPX_SKT_NETBIOS 0x0455
42 #define IPX_SKT_DIAGNOSTICS 0x0456
43 #define IPX_SKT_NWLINK_DGM 0x0553 /* NWLink datagram, may contain SMB */
44 #define IPX_SKT_EIGRP 0x85be /* Cisco EIGRP over IPX */
45
46 /* IPX transport header */
47 struct ipxHdr {
48 nd_uint16_t cksum; /* Checksum */
49 nd_uint16_t length; /* Length, in bytes, including header */
50 nd_uint8_t tCtl; /* Transport Control (i.e. hop count) */
51 nd_uint8_t pType; /* Packet Type (i.e. level 2 protocol) */
52 nd_uint32_t dstNet; /* destination net */
53 nd_mac_addr dstNode; /* destination node */
54 nd_uint16_t dstSkt; /* destination socket */
55 nd_uint32_t srcNet; /* source net */
56 nd_mac_addr srcNode; /* source node */
57 nd_uint16_t srcSkt; /* source socket */
58 };
59
60 #define ipxSize 30
61
62 static const char *ipxaddr_string(netdissect_options *, uint32_t, const u_char *);
63 static void ipx_decode(netdissect_options *, const struct ipxHdr *, const u_char *, u_int);
64 static void ipx_sap_print(netdissect_options *, const u_char *, u_int);
65 static void ipx_rip_print(netdissect_options *, const u_char *, u_int);
66
67 /*
68 * Print IPX datagram packets.
69 */
70 void
ipx_print(netdissect_options * ndo,const u_char * p,u_int length)71 ipx_print(netdissect_options *ndo, const u_char *p, u_int length)
72 {
73 const struct ipxHdr *ipx = (const struct ipxHdr *)p;
74
75 ndo->ndo_protocol = "ipx";
76 if (!ndo->ndo_eflag)
77 ND_PRINT("IPX ");
78
79 ND_PRINT("%s.%04x > ",
80 ipxaddr_string(ndo, GET_BE_U_4(ipx->srcNet), ipx->srcNode),
81 GET_BE_U_2(ipx->srcSkt));
82
83 ND_PRINT("%s.%04x: ",
84 ipxaddr_string(ndo, GET_BE_U_4(ipx->dstNet), ipx->dstNode),
85 GET_BE_U_2(ipx->dstSkt));
86
87 /* take length from ipx header */
88 length = GET_BE_U_2(ipx->length);
89
90 if (length < ipxSize) {
91 ND_PRINT("[length %u < %u]", length, ipxSize);
92 nd_print_invalid(ndo);
93 return;
94 }
95 ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
96 }
97
98 static const char *
ipxaddr_string(netdissect_options * ndo,uint32_t net,const u_char * node)99 ipxaddr_string(netdissect_options *ndo, uint32_t net, const u_char *node)
100 {
101 static char line[256];
102
103 snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
104 net, GET_U_1(node), GET_U_1(node + 1),
105 GET_U_1(node + 2), GET_U_1(node + 3),
106 GET_U_1(node + 4), GET_U_1(node + 5));
107
108 return line;
109 }
110
111 static void
ipx_decode(netdissect_options * ndo,const struct ipxHdr * ipx,const u_char * datap,u_int length)112 ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
113 {
114 u_short dstSkt;
115
116 dstSkt = GET_BE_U_2(ipx->dstSkt);
117 switch (dstSkt) {
118 case IPX_SKT_NCP:
119 ND_PRINT("ipx-ncp %u", length);
120 break;
121 case IPX_SKT_SAP:
122 ipx_sap_print(ndo, datap, length);
123 break;
124 case IPX_SKT_RIP:
125 ipx_rip_print(ndo, datap, length);
126 break;
127 case IPX_SKT_NETBIOS:
128 ND_PRINT("ipx-netbios %u", length);
129 #ifdef ENABLE_SMB
130 ipx_netbios_print(ndo, datap, length);
131 #endif
132 break;
133 case IPX_SKT_DIAGNOSTICS:
134 ND_PRINT("ipx-diags %u", length);
135 break;
136 case IPX_SKT_NWLINK_DGM:
137 ND_PRINT("ipx-nwlink-dgm %u", length);
138 #ifdef ENABLE_SMB
139 ipx_netbios_print(ndo, datap, length);
140 #endif
141 break;
142 case IPX_SKT_EIGRP:
143 eigrp_print(ndo, datap, length);
144 break;
145 default:
146 ND_PRINT("ipx-#%x %u", dstSkt, length);
147 break;
148 }
149 }
150
151 static void
ipx_sap_print(netdissect_options * ndo,const u_char * ipx,u_int length)152 ipx_sap_print(netdissect_options *ndo, const u_char *ipx, u_int length)
153 {
154 int command, i;
155
156 command = GET_BE_U_2(ipx);
157 ND_ICHECK_U(length, <, 2);
158 ipx += 2;
159 length -= 2;
160
161 switch (command) {
162 case 1:
163 case 3:
164 if (command == 1)
165 ND_PRINT("ipx-sap-req");
166 else
167 ND_PRINT("ipx-sap-nearest-req");
168
169 ND_PRINT(" %s", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
170 break;
171
172 case 2:
173 case 4:
174 if (command == 2)
175 ND_PRINT("ipx-sap-resp");
176 else
177 ND_PRINT("ipx-sap-nearest-resp");
178
179 for (i = 0; i < 8 && length != 0; i++) {
180 ND_TCHECK_2(ipx);
181 if (length < 2)
182 goto invalid;
183 ND_PRINT(" %s '", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
184 ipx += 2;
185 length -= 2;
186 if (length < 48) {
187 ND_PRINT("'");
188 goto invalid;
189 }
190 nd_printjnp(ndo, ipx, 48);
191 ND_PRINT("'");
192 ipx += 48;
193 length -= 48;
194 /*
195 * 10 bytes of IPX address.
196 */
197 ND_TCHECK_LEN(ipx, 10);
198 if (length < 10)
199 goto invalid;
200 ND_PRINT(" addr %s",
201 ipxaddr_string(ndo, GET_BE_U_4(ipx), ipx + 4));
202 ipx += 10;
203 length -= 10;
204 /*
205 * 2 bytes of socket and 2 bytes of number of intermediate
206 * networks.
207 */
208 ND_TCHECK_4(ipx);
209 if (length < 4)
210 goto invalid;
211 ipx += 4;
212 length -= 4;
213 }
214 break;
215 default:
216 ND_PRINT("ipx-sap-?%x", command);
217 break;
218 }
219 return;
220
221 invalid:
222 nd_print_invalid(ndo);
223 }
224
225 static void
ipx_rip_print(netdissect_options * ndo,const u_char * ipx,u_int length)226 ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
227 {
228 int command, i;
229
230 command = GET_BE_U_2(ipx);
231 ND_ICHECK_U(length, <, 2);
232 ipx += 2;
233 length -= 2;
234
235 switch (command) {
236 case 1:
237 ND_PRINT("ipx-rip-req");
238 if (length != 0) {
239 if (length < 8)
240 goto invalid;
241 ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
242 GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
243 }
244 break;
245 case 2:
246 ND_PRINT("ipx-rip-resp");
247 for (i = 0; i < 50 && length != 0; i++) {
248 if (length < 8)
249 goto invalid;
250 ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
251 GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
252
253 ipx += 8;
254 length -= 8;
255 }
256 break;
257 default:
258 ND_PRINT("ipx-rip-?%x", command);
259 break;
260 }
261 return;
262
263 invalid:
264 nd_print_invalid(ndo);
265 }
266