File: | src/sbin/dhclient/parse.c |
Warning: | line 101, column 4 Value stored to 'token' is never read |
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1 | /* $OpenBSD: parse.c,v 1.83 2019/07/22 17:20:06 krw Exp $ */ |
2 | |
3 | /* Common parser code for dhcpd and dhclient. */ |
4 | |
5 | /* |
6 | * Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium. |
7 | * All rights reserved. |
8 | * |
9 | * Redistribution and use in source and binary forms, with or without |
10 | * modification, are permitted provided that the following conditions |
11 | * are met: |
12 | * |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * 3. Neither the name of The Internet Software Consortium nor the names |
19 | * of its contributors may be used to endorse or promote products derived |
20 | * from this software without specific prior written permission. |
21 | * |
22 | * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND |
23 | * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
24 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
26 | * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR |
27 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
29 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
30 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
31 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
32 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
33 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
34 | * SUCH DAMAGE. |
35 | * |
36 | * This software has been written for the Internet Software Consortium |
37 | * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie |
38 | * Enterprises. To learn more about the Internet Software Consortium, |
39 | * see ``http://www.vix.com/isc''. To learn more about Vixie |
40 | * Enterprises, see ``http://www.vix.com''. |
41 | */ |
42 | |
43 | #include <sys/queue.h> |
44 | #include <sys/socket.h> |
45 | |
46 | #include <net/if.h> |
47 | |
48 | #include <netinet/in.h> |
49 | #include <netinet/if_ether.h> |
50 | |
51 | #include <errno(*__errno()).h> |
52 | #include <limits.h> |
53 | #include <signal.h> |
54 | #include <stdio.h> |
55 | #include <stdlib.h> |
56 | #include <stdint.h> |
57 | #include <string.h> |
58 | #include <syslog.h> |
59 | #include <unistd.h> |
60 | #include <vis.h> |
61 | |
62 | #include "dhcp.h" |
63 | #include "dhcpd.h" |
64 | #include "dhctoken.h" |
65 | #include "log.h" |
66 | |
67 | /* |
68 | * Skip to the semicolon ending the current statement. If we encounter |
69 | * braces, the matching closing brace terminates the statement. If we |
70 | * encounter a right brace but haven't encountered a left brace, return |
71 | * leaving the brace in the token buffer for the caller. If we see a |
72 | * semicolon and haven't seen a left brace, return. This lets us skip |
73 | * over: |
74 | * |
75 | * statement; |
76 | * statement foo bar { } |
77 | * statement foo bar { statement { } } |
78 | * statement} |
79 | * |
80 | * ...et cetera. |
81 | */ |
82 | void |
83 | skip_to_semi(FILE *cfile) |
84 | { |
85 | int token; |
86 | int brace_count = 0; |
87 | |
88 | do { |
89 | token = peek_token(NULL((void *)0), cfile); |
90 | if (token == '}') { |
91 | if (brace_count > 0) { |
92 | if (--brace_count == 0) { |
93 | token = next_token(NULL((void *)0), cfile); |
94 | return; |
95 | } |
96 | } else |
97 | return; |
98 | } else if (token == '{') { |
99 | brace_count++; |
100 | } else if (token == ';' && brace_count == 0) { |
101 | token = next_token(NULL((void *)0), cfile); |
Value stored to 'token' is never read | |
102 | return; |
103 | } |
104 | token = next_token(NULL((void *)0), cfile); |
105 | } while (token != EOF(-1)); |
106 | } |
107 | |
108 | int |
109 | parse_semi(FILE *cfile) |
110 | { |
111 | int token; |
112 | |
113 | token = next_token(NULL((void *)0), cfile); |
114 | if (token == ';') |
115 | return 1; |
116 | |
117 | parse_warn("expecting semicolon."); |
118 | skip_to_semi(cfile); |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | int |
124 | parse_string(FILE *cfile, char **string) |
125 | { |
126 | static char unvisbuf[1500]; |
127 | char *val; |
128 | int i, token; |
129 | |
130 | token = next_token(&val, cfile); |
131 | if (token == TOK_STRING262) { |
132 | i = strnunvis(unvisbuf, val, sizeof(unvisbuf)); |
133 | if (i >= 0) { |
134 | *string = strdup(unvisbuf); |
135 | if (*string == NULL((void *)0)) |
136 | fatal("strdup(unvisbuf)"); |
137 | return 1; |
138 | } |
139 | } |
140 | |
141 | parse_warn("expecting string."); |
142 | |
143 | if (token != ';') |
144 | skip_to_semi(cfile); |
145 | |
146 | return 0; |
147 | } |
148 | |
149 | /* |
150 | * cidr :== ip-address "/" bit-count |
151 | * ip-address :== NUMBER [ DOT NUMBER [ DOT NUMBER [ DOT NUMBER ] ] ] |
152 | * bit-count :== 0..32 |
153 | */ |
154 | int |
155 | parse_cidr(FILE *cfile, unsigned char *cidr) |
156 | { |
157 | uint8_t buf[5]; |
158 | const char *errstr; |
159 | char *val; |
160 | long long numval; |
161 | unsigned int i; |
162 | int token; |
163 | |
164 | memset(buf, 0, sizeof(buf)); |
165 | i = 1; /* Last four octets hold subnet, first octet the # of bits. */ |
166 | do { |
167 | token = next_token(&val, cfile); |
168 | if (i == 0) |
169 | numval = strtonum(val, 0, 32, &errstr); |
170 | else |
171 | numval = strtonum(val, 0, UINT8_MAX0xff, &errstr); |
172 | if (errstr != NULL((void *)0)) |
173 | break; |
174 | buf[i++] = numval; |
175 | if (i == 1) { |
176 | memcpy(cidr, buf, sizeof(buf)); /* XXX Need cidr_t */ |
177 | return 1; |
178 | } |
179 | token = next_token(NULL((void *)0), cfile); |
180 | if (token == '/') |
181 | i = 0; |
182 | if (i == sizeof(buf)) |
183 | break; |
184 | } while (token == '.' || token == '/'); |
185 | |
186 | parse_warn("expecting IPv4 CIDR block."); |
187 | |
188 | if (token != ';') |
189 | skip_to_semi(cfile); |
190 | |
191 | return 0; |
192 | } |
193 | |
194 | int |
195 | parse_ip_addr(FILE *cfile, struct in_addr *addr) |
196 | { |
197 | struct in_addr buf; |
198 | const char *errstr; |
199 | char *val; |
200 | long long numval; |
201 | unsigned int i; |
202 | int token; |
203 | |
204 | i = 0; |
205 | do { |
206 | token = next_token(&val, cfile); |
207 | numval = strtonum(val, 0, UINT8_MAX0xff, &errstr); |
208 | if (errstr != NULL((void *)0)) |
209 | break; |
210 | ((uint8_t *)&buf)[i++] = numval; |
211 | if (i == sizeof(buf)) { |
212 | memcpy(addr, &buf, sizeof(*addr)); |
213 | return 1; |
214 | } |
215 | token = next_token(NULL((void *)0), cfile); |
216 | } while (token == '.'); |
217 | |
218 | parse_warn("expecting IPv4 address."); |
219 | |
220 | if (token != ';') |
221 | skip_to_semi(cfile); |
222 | |
223 | return 0; |
224 | } |
225 | |
226 | int |
227 | parse_boolean(FILE *cfile, unsigned char *buf) |
228 | { |
229 | char *val; |
230 | int token; |
231 | |
232 | token = next_token(&val, cfile); |
233 | if (is_identifier(token)((token) >= 257 && (token) != 262 && (token ) != 263 && (token) != (-1)) != 0) { |
234 | if (strcasecmp(val, "true") == 0 || |
235 | strcasecmp(val, "on") == 0) { |
236 | buf[0] = 1; |
237 | return 1; |
238 | } |
239 | if (strcasecmp(val, "false") == 0 || |
240 | strcasecmp(val, "off") == 0) { |
241 | buf[0] = 0; |
242 | return 1; |
243 | } |
244 | } |
245 | |
246 | parse_warn("expecting boolean."); |
247 | if (token != ';') |
248 | skip_to_semi(cfile); |
249 | |
250 | return 0; |
251 | } |
252 | |
253 | int |
254 | parse_number(FILE *cfile, long long *number, long long low, long long high) |
255 | { |
256 | const char *errstr; |
257 | char *val, *msg; |
258 | int rslt, token; |
259 | long long numval; |
260 | |
261 | token = next_token(&val, cfile); |
262 | |
263 | numval = strtonum(val, low, high, &errstr); |
264 | if (errstr == NULL((void *)0)) { |
265 | *number = numval; |
266 | return 1; |
267 | } |
268 | |
269 | rslt = asprintf(&msg, "expecting integer between %lld and %lld", low, |
270 | high); |
271 | if (rslt != -1) { |
272 | parse_warn(msg); |
273 | free(msg); |
274 | } |
275 | |
276 | if (token != ';') |
277 | skip_to_semi(cfile); |
278 | |
279 | return 0; |
280 | } |
281 | |
282 | void |
283 | parse_warn(char *msg) |
284 | { |
285 | static char spaces[81]; |
286 | unsigned int i; |
287 | |
288 | log_warnx("%s: %s line %d: %s", log_procname, tlname, lexline, msg); |
289 | log_warnx("%s: %s", log_procname, token_line); |
290 | if ((unsigned int)lexchar < sizeof(spaces)) { |
291 | memset(spaces, 0, sizeof(spaces)); |
292 | for (i = 0; (int)i < lexchar - 1; i++) { |
293 | if (token_line[i] == '\t') |
294 | spaces[i] = '\t'; |
295 | else |
296 | spaces[i] = ' '; |
297 | } |
298 | log_warnx("%s: %s^", log_procname, spaces); |
299 | } |
300 | } |