conffile.c revision 1.13 1 1.13 joerg /* $NetBSD: conffile.c,v 1.13 2020/04/22 23:53:27 joerg Exp $ */
2 1.1 kefren
3 1.1 kefren /*
4 1.1 kefren * Copyright (c) 2010 The NetBSD Foundation, Inc.
5 1.1 kefren * All rights reserved.
6 1.1 kefren *
7 1.1 kefren * This code is derived from software contributed to The NetBSD Foundation
8 1.1 kefren * by Mihai Chelaru <kefren (at) NetBSD.org>
9 1.1 kefren *
10 1.1 kefren * Redistribution and use in source and binary forms, with or without
11 1.1 kefren * modification, are permitted provided that the following conditions
12 1.1 kefren * are met:
13 1.1 kefren * 1. Redistributions of source code must retain the above copyright
14 1.1 kefren * notice, this list of conditions and the following disclaimer.
15 1.1 kefren * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 kefren * notice, this list of conditions and the following disclaimer in the
17 1.1 kefren * documentation and/or other materials provided with the distribution.
18 1.1 kefren *
19 1.1 kefren * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 1.1 kefren * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 1.1 kefren * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 1.1 kefren * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 1.1 kefren * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 1.1 kefren * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 1.1 kefren * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 1.1 kefren * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 1.1 kefren * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 1.1 kefren * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 1.1 kefren * POSSIBILITY OF SUCH DAMAGE.
30 1.1 kefren */
31 1.1 kefren
32 1.12 christos #include <sys/mman.h>
33 1.12 christos #include <sys/stat.h>
34 1.12 christos
35 1.1 kefren #include <arpa/inet.h>
36 1.1 kefren #include <netinet/in.h>
37 1.12 christos
38 1.1 kefren #include <ctype.h>
39 1.1 kefren #include <fcntl.h>
40 1.1 kefren #include <stdlib.h>
41 1.1 kefren #include <string.h>
42 1.1 kefren #include <unistd.h>
43 1.1 kefren
44 1.1 kefren #include "conffile.h"
45 1.1 kefren #include "ldp_errors.h"
46 1.1 kefren
47 1.1 kefren #define NextCommand(x) strsep(&x, " ")
48 1.1 kefren #define LINEMAXSIZE 1024
49 1.1 kefren
50 1.13 joerg struct coifs_head coifs_head;
51 1.13 joerg struct conei_head conei_head;
52 1.13 joerg
53 1.8 kefren char *mapped, *nextline;
54 1.8 kefren size_t mapsize;
55 1.8 kefren
56 1.1 kefren extern int ldp_hello_time, ldp_keepalive_time, ldp_holddown_time, command_port,
57 1.4 kefren min_label, max_label, no_default_route, loop_detection;
58 1.1 kefren struct in_addr conf_ldp_id;
59 1.1 kefren
60 1.1 kefren static int conf_dispatch(char*);
61 1.8 kefren static char * conf_getlinelimit(void);
62 1.1 kefren static int checkeol(char*);
63 1.1 kefren static int Fhellotime(char*);
64 1.1 kefren static int Fport(char*);
65 1.1 kefren static int Fholddown(char*);
66 1.1 kefren static int Fkeepalive(char*);
67 1.1 kefren static int Fmaxlabel(char*);
68 1.1 kefren static int Fminlabel(char*);
69 1.1 kefren static int Fldpid(char*);
70 1.1 kefren static int Fneighbour(char*);
71 1.1 kefren static int Gneighbour(struct conf_neighbour *, char *);
72 1.3 kefren static int Fnodefault(char*);
73 1.4 kefren static int Floopdetection(char*);
74 1.7 kefren static int Finterface(char*);
75 1.7 kefren static int Ginterface(struct conf_interface *, char *);
76 1.7 kefren static int Ipassive(struct conf_interface *, char *);
77 1.7 kefren static int Itaddr(struct conf_interface *, char *);
78 1.1 kefren
79 1.1 kefren struct conf_func {
80 1.1 kefren char com[64];
81 1.1 kefren int (* func)(char *);
82 1.1 kefren };
83 1.1 kefren
84 1.7 kefren struct intf_func {
85 1.7 kefren char com[64];
86 1.7 kefren int (* func)(struct conf_interface *, char *);
87 1.7 kefren };
88 1.7 kefren
89 1.1 kefren struct conf_func main_commands[] = {
90 1.1 kefren { "hello-time", Fhellotime },
91 1.1 kefren { "keepalive-time", Fkeepalive },
92 1.1 kefren { "holddown-time", Fholddown },
93 1.1 kefren { "command-port", Fport },
94 1.1 kefren { "min-label", Fminlabel },
95 1.1 kefren { "max-label", Fmaxlabel },
96 1.7 kefren { "ldp-id", Fldpid },
97 1.1 kefren { "neighbor", Fneighbour },
98 1.1 kefren { "neighbour", Fneighbour },
99 1.3 kefren { "no-default-route", Fnodefault },
100 1.4 kefren { "loop-detection", Floopdetection },
101 1.7 kefren { "interface", Finterface },
102 1.1 kefren { "", NULL },
103 1.1 kefren };
104 1.1 kefren
105 1.7 kefren struct intf_func intf_commands[] = {
106 1.7 kefren { "passive", Ipassive },
107 1.7 kefren { "transport-address", Itaddr },
108 1.7 kefren { "", NULL },
109 1.7 kefren };
110 1.7 kefren
111 1.7 kefren static int parseline;
112 1.7 kefren
113 1.1 kefren /*
114 1.1 kefren * Parses config file
115 1.1 kefren */
116 1.1 kefren int
117 1.6 kefren conf_parsefile(const char *fname)
118 1.1 kefren {
119 1.8 kefren char line[LINEMAXSIZE+1];
120 1.8 kefren struct stat fs;
121 1.1 kefren
122 1.1 kefren SLIST_INIT(&conei_head);
123 1.7 kefren SLIST_INIT(&coifs_head);
124 1.1 kefren conf_ldp_id.s_addr = 0;
125 1.1 kefren
126 1.8 kefren int confh = open(fname, O_RDONLY, 0);
127 1.1 kefren
128 1.8 kefren if (confh == -1 || fstat(confh, &fs) == -1 ||
129 1.8 kefren (mapped = mmap(NULL, fs.st_size, PROT_READ, MAP_SHARED, confh, 0))
130 1.9 christos == MAP_FAILED) {
131 1.11 christos if (confh != -1)
132 1.11 christos close(confh);
133 1.1 kefren return E_CONF_IO;
134 1.9 christos }
135 1.1 kefren
136 1.8 kefren mapsize = fs.st_size;
137 1.8 kefren nextline = mapped;
138 1.8 kefren for (parseline = 1; ; parseline++) {
139 1.8 kefren char *prev = nextline;
140 1.8 kefren if ((nextline = conf_getlinelimit()) == NULL)
141 1.8 kefren break;
142 1.8 kefren while (isspace((int)*prev) != 0 && prev < nextline)
143 1.8 kefren prev++;
144 1.8 kefren if (nextline - prev < 2)
145 1.8 kefren continue;
146 1.8 kefren else if (nextline - prev > LINEMAXSIZE)
147 1.8 kefren goto parerr;
148 1.8 kefren memcpy(line, prev, nextline - prev);
149 1.8 kefren if (line[0] == '#')
150 1.8 kefren continue;
151 1.8 kefren else
152 1.8 kefren line[nextline - prev] = '\0';
153 1.8 kefren if (conf_dispatch(line) != 0)
154 1.8 kefren goto parerr;
155 1.8 kefren }
156 1.8 kefren munmap(mapped, mapsize);
157 1.1 kefren close(confh);
158 1.1 kefren return 0;
159 1.8 kefren parerr:
160 1.8 kefren munmap(mapped, mapsize);
161 1.8 kefren close(confh);
162 1.8 kefren return parseline;
163 1.1 kefren }
164 1.1 kefren
165 1.8 kefren char *
166 1.8 kefren conf_getlinelimit(void)
167 1.1 kefren {
168 1.8 kefren char *p = nextline;
169 1.1 kefren
170 1.8 kefren if (nextline < mapped || (size_t)(nextline - mapped) >= mapsize)
171 1.8 kefren return NULL;
172 1.8 kefren
173 1.8 kefren for (p = nextline; *p != '\n' && (size_t)(p - mapped) < mapsize; p++);
174 1.8 kefren return p + 1;
175 1.1 kefren }
176 1.1 kefren
177 1.1 kefren /*
178 1.1 kefren * Looks for a matching command on a line
179 1.1 kefren */
180 1.1 kefren int
181 1.1 kefren conf_dispatch(char *line)
182 1.1 kefren {
183 1.1 kefren int i, last_match = -1, matched = 0;
184 1.1 kefren char *command, *nline = line;
185 1.1 kefren
186 1.1 kefren if (strlen(line) == 0 || line[0] == '#')
187 1.1 kefren return E_CONF_OK;
188 1.1 kefren command = NextCommand(nline);
189 1.1 kefren for (i = 0; main_commands[i].func != NULL; i++)
190 1.1 kefren if (strncasecmp(main_commands[i].com, command,
191 1.7 kefren strlen(main_commands[i].com)) == 0) {
192 1.1 kefren matched++;
193 1.1 kefren last_match = i;
194 1.1 kefren }
195 1.1 kefren if (matched == 0)
196 1.1 kefren return E_CONF_NOMATCH;
197 1.1 kefren else if (matched > 1)
198 1.1 kefren return E_CONF_AMBIGUOUS;
199 1.1 kefren
200 1.8 kefren if (nline == NULL || checkeol(nline) != 0)
201 1.1 kefren return E_CONF_PARAM;
202 1.1 kefren return main_commands[last_match].func(nline);
203 1.1 kefren }
204 1.1 kefren
205 1.1 kefren /*
206 1.1 kefren * Checks if a line is terminated or else if it contains
207 1.1 kefren * a start block bracket. If it's semicolon terminated
208 1.1 kefren * then trim it.
209 1.1 kefren */
210 1.1 kefren int
211 1.1 kefren checkeol(char *line)
212 1.1 kefren {
213 1.2 christos size_t len = strlen(line);
214 1.8 kefren if (len > 0 && line[len - 1] == '\n') {
215 1.8 kefren line[len - 1] = '\0';
216 1.8 kefren len--;
217 1.8 kefren }
218 1.2 christos if (len > 0 && line[len - 1] == ';') {
219 1.2 christos line[len - 1] = '\0';
220 1.1 kefren return 0;
221 1.1 kefren }
222 1.2 christos for (size_t i = 0; i < len; i++)
223 1.1 kefren if (line[i] == '{')
224 1.1 kefren return 0;
225 1.1 kefren return -1;
226 1.1 kefren }
227 1.1 kefren
228 1.1 kefren /*
229 1.1 kefren * Sets hello time
230 1.1 kefren */
231 1.1 kefren int
232 1.1 kefren Fhellotime(char *line)
233 1.1 kefren {
234 1.1 kefren int ht = atoi(line);
235 1.1 kefren if (ht <= 0)
236 1.1 kefren return E_CONF_PARAM;
237 1.1 kefren ldp_hello_time = ht;
238 1.1 kefren return 0;
239 1.1 kefren }
240 1.1 kefren
241 1.1 kefren /*
242 1.1 kefren * Sets command port
243 1.1 kefren */
244 1.1 kefren int
245 1.1 kefren Fport(char *line)
246 1.1 kefren {
247 1.1 kefren int cp = atoi(line);
248 1.1 kefren if (cp <= 0 || cp > 65535)
249 1.1 kefren return E_CONF_PARAM;
250 1.1 kefren command_port = cp;
251 1.1 kefren return 0;
252 1.1 kefren }
253 1.1 kefren
254 1.1 kefren /*
255 1.1 kefren * Sets neighbour keepalive
256 1.1 kefren */
257 1.1 kefren int
258 1.1 kefren Fkeepalive(char *line)
259 1.1 kefren {
260 1.1 kefren int kt = atoi(line);
261 1.1 kefren if (kt <= 0)
262 1.1 kefren return E_CONF_PARAM;
263 1.1 kefren ldp_keepalive_time = kt;
264 1.1 kefren return 0;
265 1.1 kefren }
266 1.1 kefren
267 1.1 kefren /*
268 1.1 kefren * Sets neighbour holddown timer
269 1.1 kefren */
270 1.1 kefren int
271 1.1 kefren Fholddown(char *line)
272 1.1 kefren {
273 1.1 kefren int hdt = atoi(line);
274 1.1 kefren if (hdt <= 0)
275 1.1 kefren return E_CONF_PARAM;
276 1.1 kefren ldp_holddown_time = hdt;
277 1.1 kefren return 0;
278 1.1 kefren }
279 1.1 kefren
280 1.1 kefren int
281 1.1 kefren Fminlabel(char *line)
282 1.1 kefren {
283 1.1 kefren int ml = atoi(line);
284 1.1 kefren if (ml <= 0)
285 1.1 kefren return E_CONF_PARAM;
286 1.1 kefren min_label = ml;
287 1.1 kefren return 0;
288 1.1 kefren }
289 1.1 kefren
290 1.1 kefren int
291 1.1 kefren Fmaxlabel(char *line)
292 1.1 kefren {
293 1.1 kefren int ml = atoi(line);
294 1.1 kefren if (ml <= 0)
295 1.1 kefren return E_CONF_PARAM;
296 1.1 kefren max_label = ml;
297 1.1 kefren return 0;
298 1.1 kefren }
299 1.1 kefren
300 1.1 kefren int
301 1.1 kefren Fldpid(char *line)
302 1.1 kefren {
303 1.1 kefren if (inet_pton(AF_INET, line, &conf_ldp_id) != 1)
304 1.1 kefren return E_CONF_PARAM;
305 1.1 kefren return 0;
306 1.1 kefren }
307 1.1 kefren
308 1.1 kefren int
309 1.1 kefren Fneighbour(char *line)
310 1.1 kefren {
311 1.1 kefren char *peer;
312 1.1 kefren struct conf_neighbour *nei;
313 1.1 kefren struct in_addr ad;
314 1.8 kefren char buf[LINEMAXSIZE];
315 1.1 kefren
316 1.1 kefren peer = NextCommand(line);
317 1.1 kefren if (inet_pton(AF_INET, peer, &ad) != 1)
318 1.1 kefren return E_CONF_PARAM;
319 1.1 kefren
320 1.1 kefren nei = calloc(1, sizeof(*nei));
321 1.2 christos if (nei == NULL)
322 1.2 christos return E_CONF_MEM;
323 1.1 kefren nei->address.s_addr = ad.s_addr;
324 1.1 kefren SLIST_INSERT_HEAD(&conei_head, nei, neilist);
325 1.1 kefren
326 1.8 kefren for ( ; ; ) {
327 1.8 kefren char *prev = nextline;
328 1.7 kefren parseline++;
329 1.8 kefren nextline = conf_getlinelimit();
330 1.8 kefren if (nextline == NULL || (size_t)(nextline - prev) > LINEMAXSIZE)
331 1.8 kefren return -1;
332 1.8 kefren while (isspace((int)*prev) != 0 && prev < nextline)
333 1.8 kefren prev++;
334 1.8 kefren memcpy(buf, prev, nextline - prev);
335 1.8 kefren if (nextline - prev < 2 || buf[0] == '#')
336 1.8 kefren continue;
337 1.8 kefren else if (buf[0] == '}')
338 1.8 kefren break;
339 1.8 kefren else
340 1.8 kefren buf[nextline - prev] = '\0';
341 1.1 kefren if (Gneighbour(nei, buf) == -1)
342 1.1 kefren return -1;
343 1.1 kefren }
344 1.1 kefren return -1;
345 1.1 kefren }
346 1.1 kefren
347 1.1 kefren /*
348 1.1 kefren * neighbour { } sub-commands
349 1.1 kefren */
350 1.1 kefren int
351 1.1 kefren Gneighbour(struct conf_neighbour *nei, char *line)
352 1.1 kefren {
353 1.1 kefren if (strncasecmp("authenticate", line, 12) == 0) {
354 1.1 kefren nei->authenticate = 1;
355 1.1 kefren return 0;
356 1.1 kefren }
357 1.1 kefren return -1;
358 1.1 kefren }
359 1.3 kefren
360 1.3 kefren int
361 1.3 kefren Fnodefault(char *line)
362 1.3 kefren {
363 1.3 kefren int nd = atoi(line);
364 1.3 kefren if (nd < 0)
365 1.3 kefren return E_CONF_PARAM;
366 1.3 kefren no_default_route = nd;
367 1.3 kefren return 0;
368 1.3 kefren }
369 1.4 kefren
370 1.4 kefren int
371 1.4 kefren Floopdetection(char *line)
372 1.4 kefren {
373 1.4 kefren int loopd = atoi(line);
374 1.4 kefren if (loopd < 0)
375 1.4 kefren return E_CONF_PARAM;
376 1.4 kefren loop_detection = loopd;
377 1.4 kefren return 0;
378 1.4 kefren }
379 1.5 kefren
380 1.7 kefren /*
381 1.7 kefren * Interface sub-commands
382 1.7 kefren */
383 1.5 kefren int
384 1.7 kefren Finterface(char *line)
385 1.5 kefren {
386 1.7 kefren char *ifname;
387 1.10 christos struct conf_interface *conf_if;
388 1.8 kefren char buf[LINEMAXSIZE];
389 1.7 kefren
390 1.10 christos if ((ifname = NextCommand(line)) == NULL)
391 1.7 kefren return -1;
392 1.10 christos if ((conf_if = calloc(1, sizeof(*conf_if))) == NULL)
393 1.10 christos return -1;
394 1.10 christos
395 1.7 kefren strlcpy(conf_if->if_name, ifname, IF_NAMESIZE);
396 1.7 kefren SLIST_INSERT_HEAD(&coifs_head, conf_if, iflist);
397 1.5 kefren
398 1.8 kefren for ( ; ; ) {
399 1.8 kefren char *prev = nextline;
400 1.7 kefren parseline++;
401 1.8 kefren nextline = conf_getlinelimit();
402 1.8 kefren if (nextline == NULL || (size_t)(nextline - prev) > LINEMAXSIZE)
403 1.8 kefren return -1;
404 1.8 kefren while (isspace((int)*prev) != 0 && prev < nextline)
405 1.8 kefren prev++;
406 1.8 kefren memcpy(buf, prev, nextline - prev);
407 1.8 kefren if (nextline - prev < 2 || buf[0] == '#')
408 1.8 kefren continue;
409 1.8 kefren else if (buf[0] == '}')
410 1.8 kefren break;
411 1.8 kefren else
412 1.8 kefren buf[nextline - prev] = '\0';
413 1.7 kefren if (Ginterface(conf_if, buf) == -1)
414 1.7 kefren return -1;
415 1.7 kefren }
416 1.8 kefren return 0;
417 1.7 kefren }
418 1.7 kefren
419 1.7 kefren int
420 1.7 kefren Ginterface(struct conf_interface *conf_if, char *buf)
421 1.7 kefren {
422 1.7 kefren int i;
423 1.7 kefren
424 1.7 kefren for (i = 0; intf_commands[i].func != NULL; i++)
425 1.7 kefren if (strncasecmp(buf, intf_commands[i].com,
426 1.7 kefren strlen(intf_commands[i].com)) == 0)
427 1.7 kefren return intf_commands[i].func(conf_if, buf +
428 1.7 kefren strlen(intf_commands[i].com) + 1);
429 1.7 kefren /* command not found */
430 1.7 kefren return -1;
431 1.7 kefren }
432 1.7 kefren
433 1.7 kefren /* sets transport address */
434 1.7 kefren int
435 1.7 kefren Itaddr(struct conf_interface *conf_if, char *buf)
436 1.7 kefren {
437 1.7 kefren if (inet_pton(AF_INET, buf, &conf_if->tr_addr) != 1)
438 1.7 kefren return -1;
439 1.7 kefren return 0;
440 1.7 kefren }
441 1.7 kefren
442 1.7 kefren /* sets passive-interface on */
443 1.7 kefren int
444 1.7 kefren Ipassive(struct conf_interface *conf_if, char *buf)
445 1.7 kefren {
446 1.7 kefren conf_if->passive = 1;
447 1.5 kefren return 0;
448 1.5 kefren }
449