conf.c revision 1.87 
1/* $OpenBSD: conf.c,v 1.87 2006/05/27 17:01:46 hshoexer Exp $	 */
2/* $EOM: conf.c,v 1.48 2000/12/04 02:04:29 angelos Exp $	 */
3
4/*
5 * Copyright (c) 1998, 1999, 2000, 2001 Niklas Hallqvist.  All rights reserved.
6 * Copyright (c) 2000, 2001, 2002 H�kan Olsson.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/*
30 * This code was written under funding by Ericsson Radio Systems.
31 */
32
33#include <sys/param.h>
34#include <sys/mman.h>
35#include <sys/queue.h>
36#include <sys/socket.h>
37#include <sys/stat.h>
38#include <netinet/in.h>
39#include <arpa/inet.h>
40#include <ctype.h>
41#include <fcntl.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46#include <errno.h>
47
48#include "app.h"
49#include "conf.h"
50#include "log.h"
51#include "monitor.h"
52#include "util.h"
53
54static char    *conf_get_trans_str(int, char *, char *);
55static void     conf_load_defaults(int);
56#if 0
57static int      conf_find_trans_xf(int, char *);
58#endif
59
60struct conf_trans {
61	TAILQ_ENTRY(conf_trans) link;
62	int	 trans;
63	enum conf_op {
64		CONF_SET, CONF_REMOVE, CONF_REMOVE_SECTION
65	}	 op;
66	char	*section;
67	char	*tag;
68	char	*value;
69	int	 override;
70	int	 is_default;
71};
72
73#define CONF_SECT_MAX 256
74
75TAILQ_HEAD(conf_trans_head, conf_trans) conf_trans_queue;
76
77struct conf_binding {
78	LIST_ENTRY(conf_binding) link;
79	char	*section;
80	char	*tag;
81	char	*value;
82	int	 is_default;
83};
84
85char	*conf_path = CONFIG_FILE;
86LIST_HEAD(conf_bindings, conf_binding) conf_bindings[256];
87
88static char	*conf_addr;
89static __inline__ u_int8_t
90conf_hash(char *s)
91{
92	u_int8_t hash = 0;
93
94	while (*s) {
95		hash = ((hash << 1) | (hash >> 7)) ^ tolower(*s);
96		s++;
97	}
98	return hash;
99}
100
101/*
102 * Insert a tag-value combination from LINE (the equal sign is at POS)
103 */
104static int
105conf_remove_now(char *section, char *tag)
106{
107	struct conf_binding *cb, *next;
108
109	for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
110	    cb = next) {
111		next = LIST_NEXT(cb, link);
112		if (strcasecmp(cb->section, section) == 0 &&
113		    strcasecmp(cb->tag, tag) == 0) {
114			LIST_REMOVE(cb, link);
115			LOG_DBG((LOG_MISC, 95, "[%s]:%s->%s removed", section,
116			    tag, cb->value));
117			free(cb->section);
118			free(cb->tag);
119			free(cb->value);
120			free(cb);
121			return 0;
122		}
123	}
124	return 1;
125}
126
127static int
128conf_remove_section_now(char *section)
129{
130	struct conf_binding *cb, *next;
131	int	unseen = 1;
132
133	for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
134	    cb = next) {
135		next = LIST_NEXT(cb, link);
136		if (strcasecmp(cb->section, section) == 0) {
137			unseen = 0;
138			LIST_REMOVE(cb, link);
139			LOG_DBG((LOG_MISC, 95, "[%s]:%s->%s removed", section,
140			    cb->tag, cb->value));
141			free(cb->section);
142			free(cb->tag);
143			free(cb->value);
144			free(cb);
145		}
146	}
147	return unseen;
148}
149
150/*
151 * Insert a tag-value combination from LINE (the equal sign is at POS)
152 * into SECTION of our configuration database.
153 */
154static int
155conf_set_now(char *section, char *tag, char *value, int override,
156    int is_default)
157{
158	struct conf_binding *node = 0;
159
160	if (override)
161		conf_remove_now(section, tag);
162	else if (conf_get_str(section, tag)) {
163		if (!is_default)
164			log_print("conf_set_now: duplicate tag [%s]:%s, "
165			    "ignoring...\n", section, tag);
166		return 1;
167	}
168	node = calloc(1, sizeof *node);
169	if (!node) {
170		log_error("conf_set_now: calloc (1, %lu) failed",
171		    (unsigned long)sizeof *node);
172		return 1;
173	}
174	node->section = node->tag = node->value = NULL;
175	if ((node->section = strdup(section)) == NULL)
176		goto fail;
177	if ((node->tag = strdup(tag)) == NULL)
178		goto fail;
179	if ((node->value = strdup(value)) == NULL)
180		goto fail;
181	node->is_default = is_default;
182
183	LIST_INSERT_HEAD(&conf_bindings[conf_hash(section)], node, link);
184	LOG_DBG((LOG_MISC, 95, "conf_set_now: [%s]:%s->%s", node->section,
185	    node->tag, node->value));
186	return 0;
187fail:
188	if (node->value) {
189		free(node->value);
190		node->value = NULL;
191	}
192	if (node->tag) {
193		free(node->tag);
194		node->tag = NULL;
195	}
196	if (node->section) {
197		free(node->section);
198		node->section = NULL;
199	}
200	return 1;
201}
202
203/*
204 * Parse the line LINE of SZ bytes.  Skip Comments, recognize section
205 * headers and feed tag-value pairs into our configuration database.
206 */
207static void
208conf_parse_line(int trans, char *line, int ln, size_t sz)
209{
210	char	*val;
211	size_t	 i;
212	int	 j;
213	static char *section = 0;
214
215	/* Lines starting with '#' or ';' are comments.  */
216	if (*line == '#' || *line == ';')
217		return;
218
219	/* '[section]' parsing...  */
220	if (*line == '[') {
221		for (i = 1; i < sz; i++)
222			if (line[i] == ']')
223				break;
224		if (section)
225			free(section);
226		if (i == sz) {
227			log_print("conf_parse_line: %d:"
228			    "unmatched ']', ignoring until next section", ln);
229			section = 0;
230			return;
231		}
232		section = malloc(i);
233		if (!section) {
234			log_print("conf_parse_line: %d: malloc (%lu) failed",
235			    ln, (unsigned long)i);
236			return;
237		}
238		strlcpy(section, line + 1, i);
239		return;
240	}
241	/* Deal with assignments.  */
242	for (i = 0; i < sz; i++)
243		if (line[i] == '=') {
244			/* If no section, we are ignoring the lines.  */
245			if (!section) {
246				log_print("conf_parse_line: %d: ignoring line "
247				    "due to no section", ln);
248				return;
249			}
250			line[strcspn(line, " \t=")] = '\0';
251			val = line + i + 1 + strspn(line + i + 1, " \t");
252			/* Skip trailing whitespace, if any */
253			for (j = sz - (val - line) - 1; j > 0 &&
254			    isspace(val[j]); j--)
255				val[j] = '\0';
256			/* XXX Perhaps should we not ignore errors?  */
257			conf_set(trans, section, line, val, 0, 0);
258			return;
259		}
260	/* Other non-empty lines are weird.  */
261	i = strspn(line, " \t");
262	if (line[i])
263		log_print("conf_parse_line: %d: syntax error", ln);
264}
265
266/* Parse the mapped configuration file.  */
267static void
268conf_parse(int trans, char *buf, size_t sz)
269{
270	char	*cp = buf;
271	char	*bufend = buf + sz;
272	char	*line;
273	int	ln = 1;
274
275	line = cp;
276	while (cp < bufend) {
277		if (*cp == '\n') {
278			/* Check for escaped newlines.  */
279			if (cp > buf && *(cp - 1) == '\\')
280				*(cp - 1) = *cp = ' ';
281			else {
282				*cp = '\0';
283				conf_parse_line(trans, line, ln, cp - line);
284				line = cp + 1;
285			}
286			ln++;
287		}
288		cp++;
289	}
290	if (cp != line)
291		log_print("conf_parse: last line unterminated, ignored.");
292}
293
294/*
295 * Auto-generate default configuration values for the transforms and
296 * suites the user wants.
297 *
298 * Resulting section names can be:
299 *  For main mode:
300 *     {DES,BLF,3DES,CAST,AES}-{MD5,SHA}[-GRP{1,2,5,14,15}][-{DSS,RSA_SIG}]
301 *  For quick mode:
302 *     QM-{proto}[-TRP]-{cipher}[-{hash}][-PFS[-{group}]]-SUITE
303 *     where
304 *       {proto}  = ESP, AH
305 *       {cipher} = DES, 3DES, CAST, BLF, AES
306 *       {hash}   = MD5, SHA, RIPEMD, SHA2-{-256,384,512}
307 *       {group}  = GRP1, GRP2, GRP5, GRP14, GRP15
308 *
309 * DH group defaults to MODP_1024.
310 *
311 * XXX We may want to support USE_TRIPLEDES, etc...
312 * XXX No EC2N DH support here yet.
313 */
314
315/* Find the value for a section+tag in the transaction list.  */
316static char *
317conf_get_trans_str(int trans, char *section, char *tag)
318{
319	struct conf_trans *node, *nf = 0;
320
321	for (node = TAILQ_FIRST(&conf_trans_queue); node;
322	    node = TAILQ_NEXT(node, link))
323		if (node->trans == trans && strcasecmp(section, node->section)
324		    == 0 && strcasecmp(tag, node->tag) == 0) {
325			if (!nf)
326				nf = node;
327			else if (node->override)
328				nf = node;
329		}
330	return nf ? nf->value : 0;
331}
332
333#if 0
334/* XXX Currently unused.  */
335static int
336conf_find_trans_xf(int phase, char *xf)
337{
338	struct conf_trans *node;
339	char	*p;
340
341	/* Find the relevant transforms and suites, if any.  */
342	for (node = TAILQ_FIRST(&conf_trans_queue); node;
343	    node = TAILQ_NEXT(node, link))
344		if ((phase == 1 && strcmp("Transforms", node->tag) == 0) ||
345		    (phase == 2 && strcmp("Suites", node->tag) == 0)) {
346			p = node->value;
347			while ((p = strstr(p, xf)) != NULL)
348				if (*(p + strlen(p)) &&
349				    *(p + strlen(p)) != ',')
350					p += strlen(p);
351				else
352					return 1;
353		}
354	return 0;
355}
356#endif
357
358static void
359conf_load_defaults_mm(int tr, char *mme, char *mmh, char *mma, char *dhg,
360    char *mme_p, char *mma_p, char *dhg_p)
361{
362	char sect[CONF_SECT_MAX];
363
364	snprintf(sect, sizeof sect, "%s-%s%s%s", mme_p, mmh, dhg_p, mma_p);
365
366	LOG_DBG((LOG_MISC, 95, "conf_load_defaults_mm: main mode %s", sect));
367
368	conf_set(tr, sect, "ENCRYPTION_ALGORITHM", mme, 0, 1);
369	if (strcmp(mme, "BLOWFISH_CBC") == 0)
370		conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_BLF_KEYLEN, 0,
371		    1);
372	else if (strcmp(mme, "AES_CBC") == 0)
373		conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_AES_KEYLEN, 0,
374		    1);
375
376	conf_set(tr, sect, "HASH_ALGORITHM", mmh, 0, 1);
377	conf_set(tr, sect, "AUTHENTICATION_METHOD", mma, 0, 1);
378	conf_set(tr, sect, "GROUP_DESCRIPTION", dhg, 0, 1);
379	conf_set(tr, sect, "Life", CONF_DFLT_TAG_LIFE_MAIN_MODE, 0, 1);
380}
381
382static void
383conf_load_defaults_qm(int tr, char *qme, char *qmh, char *dhg, char *qme_p,
384    char *qmh_p, char *dhg_p, int proto, int mode, int pfs)
385{
386	char sect[CONF_SECT_MAX], tmp[CONF_SECT_MAX];
387
388	/* Helper #defines, incl abbreviations.  */
389#define PROTO(x)  ((x) ? "AH" : "ESP")
390#define PFS(x)    ((x) ? "-PFS" : "")
391#define MODE(x)   ((x) ? "TRANSPORT" : "TUNNEL")
392#define MODE_p(x) ((x) ? "-TRP" : "")
393
394	if (proto == 1 && strcmp(qmh, "NONE") == 0) /* AH */
395		return;
396
397	snprintf(tmp, sizeof tmp, "QM-%s%s%s%s%s%s", PROTO(proto),
398	    MODE_p(mode), qme_p, qmh_p, PFS(pfs), dhg_p);
399
400	strlcpy(sect, tmp, CONF_SECT_MAX);
401	strlcat(sect, "-SUITE",	CONF_SECT_MAX);
402
403	LOG_DBG((LOG_MISC, 95, "conf_load_defaults_qm: quick mode %s", sect));
404
405	conf_set(tr, sect, "Protocols", tmp, 0, 1);
406	snprintf(sect, sizeof sect, "IPSEC_%s", PROTO(proto));
407	conf_set(tr, tmp, "PROTOCOL_ID", sect, 0, 1);
408	strlcpy(sect, tmp, CONF_SECT_MAX);
409	strlcat(sect, "-XF", CONF_SECT_MAX);
410	conf_set(tr, tmp, "Transforms", sect, 0, 1);
411
412	/*
413	 * XXX For now, defaults
414	 * contain one xf per protocol.
415	 */
416	conf_set(tr, sect, "TRANSFORM_ID", qme, 0, 1);
417	if (strcmp(qme ,"BLOWFISH") == 0)
418		conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_BLF_KEYLEN, 0,
419			 1);
420	else if (strcmp(qme ,"AES") == 0)
421		conf_set(tr, sect, "KEY_LENGTH", CONF_DFLT_VAL_AES_KEYLEN, 0,
422			 1);
423	conf_set(tr, sect, "ENCAPSULATION_MODE", MODE(mode), 0, 1);
424	if (strcmp(qmh, "NONE")) {
425		conf_set(tr, sect, "AUTHENTICATION_ALGORITHM", qmh, 0, 1);
426
427		/* XXX Another shortcut to keep length down */
428		if (pfs)
429			conf_set(tr, sect, "GROUP_DESCRIPTION", dhg, 0, 1);
430	}
431
432	/* XXX Lifetimes depending on enc/auth strength? */
433	conf_set(tr, sect, "Life", CONF_DFLT_TAG_LIFE_QUICK_MODE, 0, 1);
434}
435
436static void
437conf_load_defaults(int tr)
438{
439	int	 enc, auth, hash, group, proto, mode, pfs;
440	char	*dflt;
441
442	char	*mm_auth[] = {"PRE_SHARED", "DSS", "RSA_SIG", 0};
443	char	*mm_auth_p[] = {"", "-DSS", "-RSA_SIG", 0};
444	char	*mm_hash[] = {"MD5", "SHA", 0};
445	char	*mm_enc[] = {"DES_CBC", "BLOWFISH_CBC", "3DES_CBC", "CAST_CBC",
446		    "AES_CBC", 0};
447	char	*mm_enc_p[] = {"DES", "BLF", "3DES", "CAST", "AES", 0};
448	char	*dhgroup[] = {"MODP_1024", "MODP_768", "MODP_1024",
449		    "MODP_1536", "MODP_2048", "MODP_3072", 0};
450	char	*dhgroup_p[] = {"", "-GRP1", "-GRP2", "-GRP5", "-GRP14",
451		    "-GRP15", 0};
452	char	*qm_enc[] = {"DES", "3DES", "CAST", "BLOWFISH", "AES", 0};
453	char	*qm_enc_p[] = {"-DES", "-3DES", "-CAST", "-BLF", "-AES", 0};
454	char	*qm_hash[] = {"HMAC_MD5", "HMAC_SHA", "HMAC_RIPEMD",
455		    "HMAC_SHA2_256", "HMAC_SHA2_384", "HMAC_SHA2_512", "NONE",
456		    0};
457	char	*qm_hash_p[] = {"-MD5", "-SHA", "-RIPEMD", "-SHA2-256",
458		    "-SHA2-384", "-SHA2-512", "", 0};
459
460	/* General and X509 defaults */
461	conf_set(tr, "General", "Retransmits", CONF_DFLT_RETRANSMITS, 0, 1);
462	conf_set(tr, "General", "Exchange-max-time", CONF_DFLT_EXCH_MAX_TIME,
463	    0, 1);
464	conf_set(tr, "General", "Use-Keynote", CONF_DFLT_USE_KEYNOTE, 0, 1);
465	conf_set(tr, "General", "Policy-file", CONF_DFLT_POLICY_FILE, 0, 1);
466	conf_set(tr, "General", "Pubkey-directory", CONF_DFLT_PUBKEY_DIR, 0,
467	    1);
468
469	conf_set(tr, "X509-certificates", "CA-directory",
470	    CONF_DFLT_X509_CA_DIR, 0, 1);
471	conf_set(tr, "X509-certificates", "Cert-directory",
472	    CONF_DFLT_X509_CERT_DIR, 0, 1);
473	conf_set(tr, "X509-certificates", "Private-key",
474	    CONF_DFLT_X509_PRIVATE_KEY, 0, 1);
475	conf_set(tr, "X509-certificates", "CRL-directory",
476	    CONF_DFLT_X509_CRL_DIR, 0, 1);
477
478	conf_set(tr, "KeyNote", "Credential-directory",
479	    CONF_DFLT_KEYNOTE_CRED_DIR, 0, 1);
480
481	/* Lifetimes. XXX p1/p2 vs main/quick mode may be unclear.  */
482	dflt = conf_get_trans_str(tr, "General", "Default-phase-1-lifetime");
483	conf_set(tr, CONF_DFLT_TAG_LIFE_MAIN_MODE, "LIFE_TYPE",
484	    CONF_DFLT_TYPE_LIFE_MAIN_MODE, 0, 1);
485	conf_set(tr, CONF_DFLT_TAG_LIFE_MAIN_MODE, "LIFE_DURATION",
486	    (dflt ? dflt : CONF_DFLT_VAL_LIFE_MAIN_MODE), 0, 1);
487
488	dflt = conf_get_trans_str(tr, "General", "Default-phase-2-lifetime");
489	conf_set(tr, CONF_DFLT_TAG_LIFE_QUICK_MODE, "LIFE_TYPE",
490	    CONF_DFLT_TYPE_LIFE_QUICK_MODE, 0, 1);
491	conf_set(tr, CONF_DFLT_TAG_LIFE_QUICK_MODE, "LIFE_DURATION",
492	    (dflt ? dflt : CONF_DFLT_VAL_LIFE_QUICK_MODE), 0, 1);
493
494	/* Default Phase-1 Configuration section */
495	conf_set(tr, CONF_DFLT_TAG_PHASE1_CONFIG, "EXCHANGE_TYPE",
496	    CONF_DFLT_PHASE1_EXCH_TYPE, 0, 1);
497	conf_set(tr, CONF_DFLT_TAG_PHASE1_CONFIG, "Transforms",
498	    CONF_DFLT_PHASE1_TRANSFORMS, 0, 1);
499
500	/* Main modes */
501	for (enc = 0; mm_enc[enc]; enc++)
502		for (hash = 0; mm_hash[hash]; hash++)
503			for (auth = 0; mm_auth[auth]; auth++)
504				for (group = 0; dhgroup_p[group]; group++)
505					conf_load_defaults_mm (tr, mm_enc[enc],
506					    mm_hash[hash], mm_auth[auth],
507					    dhgroup[group], mm_enc_p[enc],
508					    mm_auth_p[auth], dhgroup_p[group]);
509
510	/* Setup a default Phase 1 entry */
511	conf_set(tr, "Phase 1", "Default", "Default-phase-1", 0, 1);
512	conf_set(tr, "Default-phase-1", "Phase", "1", 0, 1);
513	conf_set(tr, "Default-phase-1", "Configuration",
514	    "Default-phase-1-configuration", 0, 1);
515	dflt = conf_get_trans_str(tr, "General", "Default-phase-1-ID");
516	if (dflt)
517		conf_set(tr, "Default-phase-1", "ID", dflt, 0, 1);
518
519	/* Quick modes */
520	for (enc = 0; qm_enc[enc]; enc++)
521		for (proto = 0; proto < 2; proto++)
522			for (mode = 0; mode < 2; mode++)
523				for (pfs = 0; pfs < 2; pfs++)
524					for (hash = 0; qm_hash[hash]; hash++)
525						for (group = 0;
526						    dhgroup_p[group]; group++)
527							conf_load_defaults_qm(
528							    tr, qm_enc[enc],
529							    qm_hash[hash],
530							    dhgroup[group],
531							    qm_enc_p[enc],
532							    qm_hash_p[hash],
533							    dhgroup_p[group],
534							    proto, mode, pfs);
535}
536
537void
538conf_init(void)
539{
540	unsigned int i;
541
542	for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
543		LIST_INIT(&conf_bindings[i]);
544	TAILQ_INIT(&conf_trans_queue);
545	conf_reinit();
546}
547
548/* Open the config file and map it into our address space, then parse it.  */
549void
550conf_reinit(void)
551{
552	struct conf_binding *cb = 0;
553	int	 fd, trans;
554	unsigned int i;
555	size_t	 sz;
556	char	*new_conf_addr = 0;
557
558	fd = monitor_open(conf_path, O_RDONLY, 0);
559	if (fd == -1 || check_file_secrecy_fd(fd, conf_path, &sz) == -1) {
560		if (fd == -1 && errno != ENOENT)
561			log_error("conf_reinit: open(\"%s\", O_RDONLY, 0) "
562			    "failed", conf_path);
563		if (fd != -1)
564			close(fd);
565
566		trans = conf_begin();
567	} else {
568		new_conf_addr = malloc(sz);
569		if (!new_conf_addr) {
570			log_error("conf_reinit: malloc (%lu) failed",
571			    (unsigned long)sz);
572			goto fail;
573		}
574		/* XXX I assume short reads won't happen here.  */
575		if (read(fd, new_conf_addr, sz) != (int)sz) {
576			log_error("conf_reinit: read (%d, %p, %lu) failed",
577			    fd, new_conf_addr, (unsigned long)sz);
578			goto fail;
579		}
580		close(fd);
581
582		trans = conf_begin();
583
584		/* XXX Should we not care about errors and rollback?  */
585		conf_parse(trans, new_conf_addr, sz);
586	}
587
588	/* Load default configuration values.  */
589	conf_load_defaults(trans);
590
591	/* Free potential existing configuration.  */
592	if (conf_addr) {
593		for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0];
594		    i++)
595			for (cb = LIST_FIRST(&conf_bindings[i]); cb;
596			    cb = LIST_FIRST(&conf_bindings[i]))
597				conf_remove_now(cb->section, cb->tag);
598		free(conf_addr);
599	}
600	conf_end(trans, 1);
601	conf_addr = new_conf_addr;
602	return;
603
604fail:
605	if (new_conf_addr)
606		free(new_conf_addr);
607	close(fd);
608}
609
610/*
611 * Return the numeric value denoted by TAG in section SECTION or DEF
612 * if that tag does not exist.
613 */
614int
615conf_get_num(char *section, char *tag, int def)
616{
617	char	*value = conf_get_str(section, tag);
618
619	if (value)
620		return atoi(value);
621	return def;
622}
623
624/*
625 * Return the socket endpoint address denoted by TAG in SECTION as a
626 * struct sockaddr.  It is the callers responsibility to deallocate
627 * this structure when it is finished with it.
628 */
629struct sockaddr *
630conf_get_address(char *section, char *tag)
631{
632	char	*value = conf_get_str(section, tag);
633	struct sockaddr *sa;
634
635	if (!value)
636		return 0;
637	if (text2sockaddr(value, 0, &sa, 0, 0) == -1)
638		return 0;
639	return sa;
640}
641
642/* Validate X according to the range denoted by TAG in section SECTION.  */
643int
644conf_match_num(char *section, char *tag, int x)
645{
646	char	*value = conf_get_str(section, tag);
647	int	 val, min, max, n;
648
649	if (!value)
650		return 0;
651	n = sscanf(value, "%d,%d:%d", &val, &min, &max);
652	switch (n) {
653	case 1:
654		LOG_DBG((LOG_MISC, 95, "conf_match_num: %s:%s %d==%d?",
655		    section, tag, val, x));
656		return x == val;
657	case 3:
658		LOG_DBG((LOG_MISC, 95, "conf_match_num: %s:%s %d<=%d<=%d?",
659		    section, tag, min, x, max));
660		return min <= x && max >= x;
661	default:
662		log_error("conf_match_num: section %s tag %s: invalid number "
663		    "spec %s", section, tag, value);
664	}
665	return 0;
666}
667
668/* Return the string value denoted by TAG in section SECTION.  */
669char *
670conf_get_str(char *section, char *tag)
671{
672	struct conf_binding *cb;
673
674	for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
675	    cb = LIST_NEXT(cb, link))
676		if (strcasecmp(section, cb->section) == 0 &&
677		    strcasecmp(tag, cb->tag) == 0) {
678			LOG_DBG((LOG_MISC, 95, "conf_get_str: [%s]:%s->%s",
679			    section, tag, cb->value));
680			return cb->value;
681		}
682	LOG_DBG((LOG_MISC, 95,
683	    "conf_get_str: configuration value not found [%s]:%s", section,
684	    tag));
685	return 0;
686}
687
688/*
689 * Build a list of string values out of the comma separated value denoted by
690 * TAG in SECTION.
691 */
692struct conf_list *
693conf_get_list(char *section, char *tag)
694{
695	char	*liststr = 0, *p, *field, *t;
696	struct conf_list *list = 0;
697	struct conf_list_node *node = 0;
698
699	list = malloc(sizeof *list);
700	if (!list)
701		goto cleanup;
702	TAILQ_INIT(&list->fields);
703	list->cnt = 0;
704	liststr = conf_get_str(section, tag);
705	if (!liststr)
706		goto cleanup;
707	liststr = strdup(liststr);
708	if (!liststr)
709		goto cleanup;
710	p = liststr;
711	while ((field = strsep(&p, ",")) != NULL) {
712		/* Skip leading whitespace */
713		while (isspace(*field))
714			field++;
715		/* Skip trailing whitespace */
716		if (p)
717			for (t = p - 1; t > field && isspace(*t); t--)
718				*t = '\0';
719		if (*field == '\0') {
720			log_print("conf_get_list: empty field, ignoring...");
721			continue;
722		}
723		list->cnt++;
724		node = calloc(1, sizeof *node);
725		if (!node)
726			goto cleanup;
727		node->field = strdup(field);
728		if (!node->field)
729			goto cleanup;
730		TAILQ_INSERT_TAIL(&list->fields, node, link);
731	}
732	free(liststr);
733	return list;
734
735cleanup:
736	if (node)
737		free(node);
738	if (list)
739		conf_free_list(list);
740	if (liststr)
741		free(liststr);
742	return 0;
743}
744
745struct conf_list *
746conf_get_tag_list(char *section)
747{
748	struct conf_list *list = 0;
749	struct conf_list_node *node = 0;
750	struct conf_binding *cb;
751
752	list = malloc(sizeof *list);
753	if (!list)
754		goto cleanup;
755	TAILQ_INIT(&list->fields);
756	list->cnt = 0;
757	for (cb = LIST_FIRST(&conf_bindings[conf_hash(section)]); cb;
758	    cb = LIST_NEXT(cb, link))
759		if (strcasecmp(section, cb->section) == 0) {
760			list->cnt++;
761			node = calloc(1, sizeof *node);
762			if (!node)
763				goto cleanup;
764			node->field = strdup(cb->tag);
765			if (!node->field)
766				goto cleanup;
767			TAILQ_INSERT_TAIL(&list->fields, node, link);
768		}
769	return list;
770
771cleanup:
772	if (node)
773		free(node);
774	if (list)
775		conf_free_list(list);
776	return 0;
777}
778
779void
780conf_free_list(struct conf_list *list)
781{
782	struct conf_list_node *node = TAILQ_FIRST(&list->fields);
783
784	while (node) {
785		TAILQ_REMOVE(&list->fields, node, link);
786		if (node->field)
787			free(node->field);
788		free(node);
789		node = TAILQ_FIRST(&list->fields);
790	}
791	free(list);
792}
793
794int
795conf_begin(void)
796{
797	static int	seq = 0;
798
799	return ++seq;
800}
801
802static struct conf_trans *
803conf_trans_node(int transaction, enum conf_op op)
804{
805	struct conf_trans *node;
806
807	node = calloc(1, sizeof *node);
808	if (!node) {
809		log_error("conf_trans_node: calloc (1, %lu) failed",
810		    (unsigned long)sizeof *node);
811		return 0;
812	}
813	node->trans = transaction;
814	node->op = op;
815	TAILQ_INSERT_TAIL(&conf_trans_queue, node, link);
816	return node;
817}
818
819/* Queue a set operation.  */
820int
821conf_set(int transaction, char *section, char *tag, char *value, int override,
822    int is_default)
823{
824	struct conf_trans *node;
825
826	node = conf_trans_node(transaction, CONF_SET);
827	if (!node)
828		return 1;
829	node->section = strdup(section);
830	if (!node->section) {
831		log_error("conf_set: strdup (\"%s\") failed", section);
832		goto fail;
833	}
834	node->tag = strdup(tag);
835	if (!node->tag) {
836		log_error("conf_set: strdup (\"%s\") failed", tag);
837		goto fail;
838	}
839	node->value = strdup(value);
840	if (!node->value) {
841		log_error("conf_set: strdup (\"%s\") failed", value);
842		goto fail;
843	}
844	node->override = override;
845	node->is_default = is_default;
846	return 0;
847
848fail:
849	if (node->tag)
850		free(node->tag);
851	if (node->section)
852		free(node->section);
853	if (node)
854		free(node);
855	return 1;
856}
857
858/* Queue a remove operation.  */
859int
860conf_remove(int transaction, char *section, char *tag)
861{
862	struct conf_trans *node;
863
864	node = conf_trans_node(transaction, CONF_REMOVE);
865	if (!node)
866		goto fail;
867	node->section = strdup(section);
868	if (!node->section) {
869		log_error("conf_remove: strdup (\"%s\") failed", section);
870		goto fail;
871	}
872	node->tag = strdup(tag);
873	if (!node->tag) {
874		log_error("conf_remove: strdup (\"%s\") failed", tag);
875		goto fail;
876	}
877	return 0;
878
879fail:
880	if (node->section)
881		free(node->section);
882	if (node)
883		free(node);
884	return 1;
885}
886
887/* Queue a remove section operation.  */
888int
889conf_remove_section(int transaction, char *section)
890{
891	struct conf_trans *node;
892
893	node = conf_trans_node(transaction, CONF_REMOVE_SECTION);
894	if (!node)
895		goto fail;
896	node->section = strdup(section);
897	if (!node->section) {
898		log_error("conf_remove_section: strdup (\"%s\") failed",
899		    section);
900		goto fail;
901	}
902	return 0;
903
904fail:
905	if (node)
906		free(node);
907	return 1;
908}
909
910/* Execute all queued operations for this transaction.  Cleanup.  */
911int
912conf_end(int transaction, int commit)
913{
914	struct conf_trans *node, *next;
915
916	for (node = TAILQ_FIRST(&conf_trans_queue); node; node = next) {
917		next = TAILQ_NEXT(node, link);
918		if (node->trans == transaction) {
919			if (commit)
920				switch (node->op) {
921				case CONF_SET:
922					conf_set_now(node->section, node->tag,
923					    node->value, node->override,
924					    node->is_default);
925					break;
926				case CONF_REMOVE:
927					conf_remove_now(node->section,
928					    node->tag);
929					break;
930				case CONF_REMOVE_SECTION:
931					conf_remove_section_now(node->section);
932					break;
933				default:
934					log_print("conf_end: unknown "
935					    "operation: %d", node->op);
936				}
937			TAILQ_REMOVE(&conf_trans_queue, node, link);
938			if (node->section)
939				free(node->section);
940			if (node->tag)
941				free(node->tag);
942			if (node->value)
943				free(node->value);
944			free(node);
945		}
946	}
947	return 0;
948}
949
950/*
951 * Dump running configuration upon SIGUSR1.
952 * Configuration is "stored in reverse order", so reverse it again.
953 */
954struct dumper {
955	char	*s, *v;
956	struct dumper *next;
957};
958
959static void
960conf_report_dump(struct dumper *node)
961{
962	/* Recursive, cleanup when we're done.  */
963
964	if (node->next)
965		conf_report_dump(node->next);
966
967	if (node->v)
968		LOG_DBG((LOG_REPORT, 0, "%s=\t%s", node->s, node->v));
969	else if (node->s) {
970		LOG_DBG((LOG_REPORT, 0, "%s", node->s));
971		if (strlen(node->s) > 0)
972			free(node->s);
973	}
974	free(node);
975}
976
977void
978conf_report(void)
979{
980	struct conf_binding *cb, *last = 0;
981	unsigned int	i;
982	char           *current_section = (char *)0;
983	struct dumper  *dumper, *dnode;
984
985	dumper = dnode = (struct dumper *)calloc(1, sizeof *dumper);
986	if (!dumper)
987		goto mem_fail;
988
989	LOG_DBG((LOG_REPORT, 0, "conf_report: dumping running configuration"));
990
991	for (i = 0; i < sizeof conf_bindings / sizeof conf_bindings[0]; i++)
992		for (cb = LIST_FIRST(&conf_bindings[i]); cb;
993		    cb = LIST_NEXT(cb, link)) {
994			if (!cb->is_default) {
995				/* Dump this entry.  */
996				if (!current_section || strcmp(cb->section,
997				    current_section)) {
998					if (current_section) {
999						if (asprintf(&dnode->s, "[%s]",
1000						    current_section) == -1)
1001							goto mem_fail;
1002						dnode->next = (struct dumper *)
1003						    calloc(1,
1004							sizeof(struct dumper));
1005						dnode = dnode->next;
1006						if (!dnode)
1007							goto mem_fail;
1008
1009						dnode->s = "";
1010						dnode->next = (struct dumper *)
1011						    calloc(1,
1012							sizeof(struct dumper));
1013						dnode = dnode->next;
1014						if (!dnode)
1015							goto mem_fail;
1016					}
1017					current_section = cb->section;
1018				}
1019				dnode->s = cb->tag;
1020				dnode->v = cb->value;
1021				dnode->next = (struct dumper *)
1022				    calloc(1, sizeof(struct dumper));
1023				dnode = dnode->next;
1024				if (!dnode)
1025					goto mem_fail;
1026				last = cb;
1027			}
1028		}
1029
1030	if (last)
1031		if (asprintf(&dnode->s, "[%s]", last->section) == -1)
1032			goto mem_fail;
1033	conf_report_dump(dumper);
1034
1035	return;
1036
1037mem_fail:
1038	log_error("conf_report: malloc/calloc failed");
1039	while ((dnode = dumper) != 0) {
1040		dumper = dumper->next;
1041		if (dnode->s)
1042			free(dnode->s);
1043		free(dnode);
1044	}
1045}
1046