File: | src/usr.sbin/tcpdump/print-lldp.c |
Warning: | line 283, column 4 Value stored to 'v' is never read |
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1 | /* $OpenBSD: print-lldp.c,v 1.9 2016/11/28 17:47:15 jca Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2006 Reyk Floeter <reyk@openbsd.org> |
5 | * |
6 | * Permission to use, copy, modify, and distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above |
8 | * copyright notice and this permission notice appear in all copies. |
9 | * |
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | */ |
18 | |
19 | #include <sys/time.h> |
20 | #include <sys/socket.h> |
21 | |
22 | #include <net/if.h> |
23 | |
24 | #include <netinet/in.h> |
25 | #include <netinet/if_ether.h> |
26 | #include <arpa/inet.h> |
27 | |
28 | #include <ctype.h> |
29 | #include <stdio.h> |
30 | #include <string.h> |
31 | |
32 | #include "addrtoname.h" |
33 | #include "extract.h" |
34 | #include "interface.h" |
35 | #include "afnum.h" |
36 | |
37 | enum { |
38 | LLDP_TLV_END = 0, |
39 | LLDP_TLV_CHASSIS_ID = 1, |
40 | LLDP_TLV_PORT_ID = 2, |
41 | LLDP_TLV_TTL = 3, |
42 | LLDP_TLV_PORT_DESCR = 4, |
43 | LLDP_TLV_SYSTEM_NAME = 5, |
44 | LLDP_TLV_SYSTEM_DESCR = 6, |
45 | LLDP_TLV_SYSTEM_CAP = 7, |
46 | LLDP_TLV_MANAGEMENT_ADDR = 8, |
47 | LLDP_TLV_ORG = 127 |
48 | }; |
49 | |
50 | enum { |
51 | LLDP_CHASSISID_SUBTYPE_CHASSIS = 1, |
52 | LLDP_CHASSISID_SUBTYPE_IFALIAS = 2, |
53 | LLDP_CHASSISID_SUBTYPE_PORT = 3, |
54 | LLDP_CHASSISID_SUBTYPE_LLADDR = 4, |
55 | LLDP_CHASSISID_SUBTYPE_ADDR = 5, |
56 | LLDP_CHASSISID_SUBTYPE_IFNAME = 6, |
57 | LLDP_CHASSISID_SUBTYPE_LOCAL = 7 |
58 | }; |
59 | |
60 | enum { |
61 | LLDP_PORTID_SUBTYPE_IFALIAS = 1, |
62 | LLDP_PORTID_SUBTYPE_PORT = 2, |
63 | LLDP_PORTID_SUBTYPE_LLADDR = 3, |
64 | LLDP_PORTID_SUBTYPE_ADDR = 4, |
65 | LLDP_PORTID_SUBTYPE_IFNAME = 5, |
66 | LLDP_PORTID_SUBTYPE_AGENTCID = 6, |
67 | LLDP_PORTID_SUBTYPE_LOCAL = 7 |
68 | }; |
69 | |
70 | #define LLDP_CAP_OTHER0x01 0x01 |
71 | #define LLDP_CAP_REPEATER0x02 0x02 |
72 | #define LLDP_CAP_BRIDGE0x04 0x04 |
73 | #define LLDP_CAP_WLAN0x08 0x08 |
74 | #define LLDP_CAP_ROUTER0x10 0x10 |
75 | #define LLDP_CAP_TELEPHONE0x20 0x20 |
76 | #define LLDP_CAP_DOCSIS0x40 0x40 |
77 | #define LLDP_CAP_STATION0x80 0x80 |
78 | #define LLDP_CAP_BITS"\20\01OTHER\02REPEATER\03BRIDGE\04WLAN\05ROUTER\06TELEPHONE" "\07DOCSIS\10STATION" \ |
79 | "\20\01OTHER\02REPEATER\03BRIDGE\04WLAN\05ROUTER\06TELEPHONE" \ |
80 | "\07DOCSIS\10STATION" |
81 | |
82 | enum { |
83 | LLDP_MGMT_IFACE_UNKNOWN = 1, |
84 | LLDP_MGMT_IFACE_IFINDEX = 2, |
85 | LLDP_MGMT_IFACE_SYSPORT = 3 |
86 | }; |
87 | |
88 | static const char *afnumber[] = AFNUM_NAME_STR{ "Reserved", "IPv4", "IPv6", "NSAP", "HDLC", "BBN 1822", "802" , "E.163", "E.164", "F.69", "X.121", "IPX", "Appletalk", "Decnet IV" , "Banyan Vines", "E.164 with NSAP subaddress", "DNS", "AS Number" , "XTP over IPv4", "XTP over IPv6", "XTP native mode", "Fibre Channel WWPN" , "Fibre Channel WWNN", "GWID" }; |
89 | |
90 | void lldp_print_str(u_int8_t *, int); |
91 | const char *lldp_print_addr(int, const void *); |
92 | void lldp_print_id(int, u_int8_t *, int); |
93 | |
94 | void |
95 | lldp_print_str(u_int8_t *str, int len) |
96 | { |
97 | int i; |
98 | printf("\""); |
99 | for (i = 0; i < len; i++) |
100 | printf("%c", isprint(str[i]) ? str[i] : '.'); |
101 | printf("\""); |
102 | } |
103 | |
104 | const char * |
105 | lldp_print_addr(int af, const void *addr) |
106 | { |
107 | static char buf[48]; |
108 | if (inet_ntop(af, addr, buf, sizeof(buf)) == NULL((void *)0)) |
109 | return ("?"); |
110 | return (buf); |
111 | } |
112 | |
113 | void |
114 | lldp_print_id(int type, u_int8_t *ptr, int len) |
115 | { |
116 | u_int8_t id; |
117 | u_int8_t *data; |
118 | |
119 | id = *(u_int8_t *)ptr; |
120 | len -= sizeof(u_int8_t); |
121 | data = ptr + sizeof(u_int8_t); |
122 | if (len <= 0) |
123 | return; |
124 | |
125 | if (type == LLDP_TLV_CHASSIS_ID) { |
126 | switch (id) { |
127 | case LLDP_CHASSISID_SUBTYPE_CHASSIS: |
128 | printf("chassis "); |
129 | lldp_print_str(data, len); |
130 | break; |
131 | case LLDP_CHASSISID_SUBTYPE_IFALIAS: |
132 | printf("ifalias"); |
133 | break; |
134 | case LLDP_CHASSISID_SUBTYPE_PORT: |
135 | printf("port"); |
136 | break; |
137 | case LLDP_CHASSISID_SUBTYPE_LLADDR: |
138 | printf("lladdr %s", etheraddr_string(data)); |
139 | break; |
140 | case LLDP_CHASSISID_SUBTYPE_ADDR: |
141 | printf("addr"); |
142 | break; |
143 | case LLDP_CHASSISID_SUBTYPE_IFNAME: |
144 | printf("ifname "); |
145 | lldp_print_str(data, len); |
146 | break; |
147 | case LLDP_CHASSISID_SUBTYPE_LOCAL: |
148 | printf("local "); |
149 | lldp_print_str(data, len); |
150 | break; |
151 | default: |
152 | printf("unknown 0x%02x", id); |
153 | break; |
154 | } |
155 | |
156 | } else if (type == LLDP_TLV_PORT_ID) { |
157 | switch (id) { |
158 | case LLDP_PORTID_SUBTYPE_IFALIAS: |
159 | printf("ifalias"); |
160 | break; |
161 | case LLDP_PORTID_SUBTYPE_PORT: |
162 | printf("port"); |
163 | break; |
164 | case LLDP_PORTID_SUBTYPE_LLADDR: |
165 | printf("lladdr %s", etheraddr_string(data)); |
166 | break; |
167 | case LLDP_PORTID_SUBTYPE_ADDR: |
168 | printf("addr"); |
169 | break; |
170 | case LLDP_PORTID_SUBTYPE_IFNAME: |
171 | printf("ifname "); |
172 | lldp_print_str(data, len); |
173 | break; |
174 | case LLDP_PORTID_SUBTYPE_AGENTCID: |
175 | printf("agentcid"); |
176 | break; |
177 | case LLDP_PORTID_SUBTYPE_LOCAL: |
178 | printf("local "); |
179 | lldp_print_str(data, len); |
180 | break; |
181 | default: |
182 | printf("unknown 0x%02x", id); |
183 | break; |
184 | } |
185 | } |
186 | } |
187 | |
188 | void |
189 | lldp_print(const u_char *p, u_int len) |
190 | { |
191 | u_int16_t tlv; |
192 | u_int8_t *ptr = (u_int8_t *)p, v = 0; |
193 | int n, type, vlen, alen; |
194 | |
195 | printf("LLDP"); |
196 | |
197 | #define _ptrinc(_v)ptr += (_v); vlen -= (_v); ptr += (_v); vlen -= (_v); |
198 | |
199 | for (n = 0; n < len;) { |
200 | TCHECK2(*ptr, sizeof(tlv))if (!(snapend - (sizeof(tlv)) <= snapend && (const u_char *)&(*ptr) <= snapend - (sizeof(tlv)))) goto trunc; |
201 | |
202 | tlv = EXTRACT_16BITS(ptr)((u_int16_t)*((const u_int8_t *)(ptr) + 0) << 8 | (u_int16_t )*((const u_int8_t *)(ptr) + 1)); |
203 | type = (tlv & 0xfe00) >> 9; |
204 | vlen = tlv & 0x1ff; |
205 | n += vlen; |
206 | |
207 | ptr += sizeof(tlv); |
208 | TCHECK2(*ptr, vlen)if (!(snapend - (vlen) <= snapend && (const u_char *)&(*ptr) <= snapend - (vlen))) goto trunc; |
209 | |
210 | switch (type) { |
211 | case LLDP_TLV_END: |
212 | goto done; |
213 | break; |
214 | |
215 | case LLDP_TLV_CHASSIS_ID: |
216 | printf(", ChassisId: "); |
217 | lldp_print_id(type, ptr, vlen); |
218 | break; |
219 | |
220 | case LLDP_TLV_PORT_ID: |
221 | printf(", PortId: "); |
222 | lldp_print_id(type, ptr, vlen); |
223 | break; |
224 | |
225 | case LLDP_TLV_TTL: |
226 | printf(", TTL: "); |
227 | TCHECK2(*ptr, 2)if (!(snapend - (2) <= snapend && (const u_char *) &(*ptr) <= snapend - (2))) goto trunc; |
228 | printf("%ds", EXTRACT_16BITS(ptr)((u_int16_t)*((const u_int8_t *)(ptr) + 0) << 8 | (u_int16_t )*((const u_int8_t *)(ptr) + 1))); |
229 | break; |
230 | |
231 | case LLDP_TLV_PORT_DESCR: |
232 | printf(", PortDescr: "); |
233 | lldp_print_str(ptr, vlen); |
234 | break; |
235 | |
236 | case LLDP_TLV_SYSTEM_NAME: |
237 | printf(", SysName: "); |
238 | lldp_print_str(ptr, vlen); |
239 | break; |
240 | |
241 | case LLDP_TLV_SYSTEM_DESCR: |
242 | printf(", SysDescr: "); |
243 | lldp_print_str(ptr, vlen); |
244 | break; |
245 | |
246 | case LLDP_TLV_SYSTEM_CAP: |
247 | printf(", CAP:"); |
248 | TCHECK2(*ptr, 4)if (!(snapend - (4) <= snapend && (const u_char *) &(*ptr) <= snapend - (4))) goto trunc; |
249 | printb(" available", EXTRACT_16BITS(ptr)((u_int16_t)*((const u_int8_t *)(ptr) + 0) << 8 | (u_int16_t )*((const u_int8_t *)(ptr) + 1)), |
250 | LLDP_CAP_BITS"\20\01OTHER\02REPEATER\03BRIDGE\04WLAN\05ROUTER\06TELEPHONE" "\07DOCSIS\10STATION"); |
251 | _ptrinc(sizeof(u_int16_t))ptr += (sizeof(u_int16_t)); vlen -= (sizeof(u_int16_t));; |
252 | printb(" enabled", EXTRACT_16BITS(ptr)((u_int16_t)*((const u_int8_t *)(ptr) + 0) << 8 | (u_int16_t )*((const u_int8_t *)(ptr) + 1)), |
253 | LLDP_CAP_BITS"\20\01OTHER\02REPEATER\03BRIDGE\04WLAN\05ROUTER\06TELEPHONE" "\07DOCSIS\10STATION"); |
254 | break; |
255 | |
256 | case LLDP_TLV_MANAGEMENT_ADDR: |
257 | printf(", MgmtAddr:"); |
258 | TCHECK2(*ptr, 2)if (!(snapend - (2) <= snapend && (const u_char *) &(*ptr) <= snapend - (2))) goto trunc; |
259 | alen = *ptr - sizeof(u_int8_t); |
260 | _ptrinc(sizeof(u_int8_t))ptr += (sizeof(u_int8_t)); vlen -= (sizeof(u_int8_t));; |
261 | v = *ptr; |
262 | _ptrinc(sizeof(u_int8_t))ptr += (sizeof(u_int8_t)); vlen -= (sizeof(u_int8_t));; |
263 | if (v < AFNUM_MAX24) |
264 | printf(" %s", afnumber[v]); |
265 | else |
266 | printf(" type %d", v); |
267 | TCHECK2(*ptr, alen)if (!(snapend - (alen) <= snapend && (const u_char *)&(*ptr) <= snapend - (alen))) goto trunc; |
268 | switch (v) { |
269 | case AFNUM_INET1: |
270 | if (alen != sizeof(struct in_addr)) |
271 | goto trunc; |
272 | printf(" %s", |
273 | lldp_print_addr(AF_INET2, ptr)); |
274 | break; |
275 | case AFNUM_INET62: |
276 | if (alen != sizeof(struct in6_addr)) |
277 | goto trunc; |
278 | printf(" %s", |
279 | lldp_print_addr(AF_INET624, ptr)); |
280 | break; |
281 | } |
282 | _ptrinc(alen)ptr += (alen); vlen -= (alen);; |
283 | v = *(u_int8_t *)ptr; |
Value stored to 'v' is never read | |
284 | break; |
285 | |
286 | case LLDP_TLV_ORG: |
287 | printf(", Org"); |
288 | break; |
289 | |
290 | default: |
291 | printf(", type %d length %d", type, vlen); |
292 | break; |
293 | } |
294 | ptr += vlen; |
295 | } |
296 | |
297 | done: |
298 | return; |
299 | |
300 | trunc: |
301 | printf(" [|LLDP]"); |
302 | } |
303 |