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 #ifdef HAVE_CONFIG_H
27 #include <config.h>
28 #endif
29
30 #include "netdissect-stdinc.h"
31
32 #include <stdio.h>
33
34 #define ND_LONGJMP_FROM_TCHECK
35 #include "netdissect.h"
36 #include "addrtoname.h"
37 #include "extract.h"
38
39 /* well-known sockets */
40 #define IPX_SKT_NCP 0x0451
41 #define IPX_SKT_SAP 0x0452
42 #define IPX_SKT_RIP 0x0453
43 #define IPX_SKT_NETBIOS 0x0455
44 #define IPX_SKT_DIAGNOSTICS 0x0456
45 #define IPX_SKT_NWLINK_DGM 0x0553 /* NWLink datagram, may contain SMB */
46 #define IPX_SKT_EIGRP 0x85be /* Cisco EIGRP over IPX */
47
48 /* IPX transport header */
49 struct ipxHdr {
50 nd_uint16_t cksum; /* Checksum */
51 nd_uint16_t length; /* Length, in bytes, including header */
52 nd_uint8_t tCtl; /* Transport Control (i.e. hop count) */
53 nd_uint8_t pType; /* Packet Type (i.e. level 2 protocol) */
54 nd_uint32_t dstNet; /* destination net */
55 nd_mac_addr dstNode; /* destination node */
56 nd_uint16_t dstSkt; /* destination socket */
57 nd_uint32_t srcNet; /* source net */
58 nd_mac_addr srcNode; /* source node */
59 nd_uint16_t srcSkt; /* source socket */
60 };
61
62 #define ipxSize 30
63
64 static const char *ipxaddr_string(netdissect_options *, uint32_t, const u_char *);
65 static void ipx_decode(netdissect_options *, const struct ipxHdr *, const u_char *, u_int);
66 static void ipx_sap_print(netdissect_options *, const u_char *, u_int);
67 static void ipx_rip_print(netdissect_options *, const u_char *, u_int);
68
69 /*
70 * Print IPX datagram packets.
71 */
72 void
ipx_print(netdissect_options * ndo,const u_char * p,u_int length)73 ipx_print(netdissect_options *ndo, const u_char *p, u_int length)
74 {
75 const struct ipxHdr *ipx = (const struct ipxHdr *)p;
76
77 ndo->ndo_protocol = "ipx";
78 if (!ndo->ndo_eflag)
79 ND_PRINT("IPX ");
80
81 ND_PRINT("%s.%04x > ",
82 ipxaddr_string(ndo, GET_BE_U_4(ipx->srcNet), ipx->srcNode),
83 GET_BE_U_2(ipx->srcSkt));
84
85 ND_PRINT("%s.%04x: ",
86 ipxaddr_string(ndo, GET_BE_U_4(ipx->dstNet), ipx->dstNode),
87 GET_BE_U_2(ipx->dstSkt));
88
89 /* take length from ipx header */
90 length = GET_BE_U_2(ipx->length);
91
92 if (length < ipxSize) {
93 ND_PRINT("[length %u < %u]", length, ipxSize);
94 nd_print_invalid(ndo);
95 return;
96 }
97 ipx_decode(ndo, ipx, p + ipxSize, length - ipxSize);
98 }
99
100 static const char *
ipxaddr_string(netdissect_options * ndo,uint32_t net,const u_char * node)101 ipxaddr_string(netdissect_options *ndo, uint32_t net, const u_char *node)
102 {
103 static char line[256];
104
105 snprintf(line, sizeof(line), "%08x.%02x:%02x:%02x:%02x:%02x:%02x",
106 net, GET_U_1(node), GET_U_1(node + 1),
107 GET_U_1(node + 2), GET_U_1(node + 3),
108 GET_U_1(node + 4), GET_U_1(node + 5));
109
110 return line;
111 }
112
113 static void
ipx_decode(netdissect_options * ndo,const struct ipxHdr * ipx,const u_char * datap,u_int length)114 ipx_decode(netdissect_options *ndo, const struct ipxHdr *ipx, const u_char *datap, u_int length)
115 {
116 u_short dstSkt;
117
118 dstSkt = GET_BE_U_2(ipx->dstSkt);
119 switch (dstSkt) {
120 case IPX_SKT_NCP:
121 ND_PRINT("ipx-ncp %u", length);
122 break;
123 case IPX_SKT_SAP:
124 ipx_sap_print(ndo, datap, length);
125 break;
126 case IPX_SKT_RIP:
127 ipx_rip_print(ndo, datap, length);
128 break;
129 case IPX_SKT_NETBIOS:
130 ND_PRINT("ipx-netbios %u", length);
131 #ifdef ENABLE_SMB
132 ipx_netbios_print(ndo, datap, length);
133 #endif
134 break;
135 case IPX_SKT_DIAGNOSTICS:
136 ND_PRINT("ipx-diags %u", length);
137 break;
138 case IPX_SKT_NWLINK_DGM:
139 ND_PRINT("ipx-nwlink-dgm %u", length);
140 #ifdef ENABLE_SMB
141 ipx_netbios_print(ndo, datap, length);
142 #endif
143 break;
144 case IPX_SKT_EIGRP:
145 eigrp_print(ndo, datap, length);
146 break;
147 default:
148 ND_PRINT("ipx-#%x %u", dstSkt, length);
149 break;
150 }
151 }
152
153 static void
ipx_sap_print(netdissect_options * ndo,const u_char * ipx,u_int length)154 ipx_sap_print(netdissect_options *ndo, const u_char *ipx, u_int length)
155 {
156 int command, i;
157
158 command = GET_BE_U_2(ipx);
159 ND_LCHECK_U(length, 2);
160 ipx += 2;
161 length -= 2;
162
163 switch (command) {
164 case 1:
165 case 3:
166 if (command == 1)
167 ND_PRINT("ipx-sap-req");
168 else
169 ND_PRINT("ipx-sap-nearest-req");
170
171 ND_PRINT(" %s", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
172 break;
173
174 case 2:
175 case 4:
176 if (command == 2)
177 ND_PRINT("ipx-sap-resp");
178 else
179 ND_PRINT("ipx-sap-nearest-resp");
180
181 for (i = 0; i < 8 && length != 0; i++) {
182 ND_TCHECK_2(ipx);
183 if (length < 2)
184 goto invalid;
185 ND_PRINT(" %s '", ipxsap_string(ndo, htons(GET_BE_U_2(ipx))));
186 ipx += 2;
187 length -= 2;
188 if (length < 48) {
189 ND_PRINT("'");
190 goto invalid;
191 }
192 nd_printjnp(ndo, ipx, 48);
193 ND_PRINT("'");
194 ipx += 48;
195 length -= 48;
196 /*
197 * 10 bytes of IPX address.
198 */
199 ND_TCHECK_LEN(ipx, 10);
200 if (length < 10)
201 goto invalid;
202 ND_PRINT(" addr %s",
203 ipxaddr_string(ndo, GET_BE_U_4(ipx), ipx + 4));
204 ipx += 10;
205 length -= 10;
206 /*
207 * 2 bytes of socket and 2 bytes of number of intermediate
208 * networks.
209 */
210 ND_TCHECK_4(ipx);
211 if (length < 4)
212 goto invalid;
213 ipx += 4;
214 length -= 4;
215 }
216 break;
217 default:
218 ND_PRINT("ipx-sap-?%x", command);
219 break;
220 }
221 return;
222
223 invalid:
224 nd_print_invalid(ndo);
225 }
226
227 static void
ipx_rip_print(netdissect_options * ndo,const u_char * ipx,u_int length)228 ipx_rip_print(netdissect_options *ndo, const u_char *ipx, u_int length)
229 {
230 int command, i;
231
232 command = GET_BE_U_2(ipx);
233 ND_LCHECK_U(length, 2);
234 ipx += 2;
235 length -= 2;
236
237 switch (command) {
238 case 1:
239 ND_PRINT("ipx-rip-req");
240 if (length != 0) {
241 if (length < 8)
242 goto invalid;
243 ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
244 GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
245 }
246 break;
247 case 2:
248 ND_PRINT("ipx-rip-resp");
249 for (i = 0; i < 50 && length != 0; i++) {
250 if (length < 8)
251 goto invalid;
252 ND_PRINT(" %08x/%u.%u", GET_BE_U_4(ipx),
253 GET_BE_U_2(ipx + 4), GET_BE_U_2(ipx + 6));
254
255 ipx += 8;
256 length -= 8;
257 }
258 break;
259 default:
260 ND_PRINT("ipx-rip-?%x", command);
261 break;
262 }
263 return;
264
265 invalid:
266 nd_print_invalid(ndo);
267 }
268