config.c revision 263020 
1/*-
2 * Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org>
3 * Copyright (c) 2013 Bryan Drewery <bdrewery@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: stable/10/usr.sbin/pkg/config.c 263020 2014-03-11 13:16:03Z bapt $");
30
31#include <sys/param.h>
32#include <sys/queue.h>
33#include <sys/sbuf.h>
34#include <sys/elf_common.h>
35#include <sys/endian.h>
36#include <sys/types.h>
37
38#include <assert.h>
39#include <dirent.h>
40#include <ucl.h>
41#include <ctype.h>
42#include <err.h>
43#include <errno.h>
44#include <fcntl.h>
45#include <gelf.h>
46#include <inttypes.h>
47#include <paths.h>
48#include <stdbool.h>
49#include <string.h>
50#include <unistd.h>
51
52#include "elf_tables.h"
53#include "config.h"
54
55#define roundup2(x, y)	(((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
56
57struct config_value {
58       char *value;
59       STAILQ_ENTRY(config_value) next;
60};
61
62struct config_entry {
63	uint8_t type;
64	const char *key;
65	const char *val;
66	char *value;
67	STAILQ_HEAD(, config_value) *list;
68	bool envset;
69};
70
71static struct config_entry c[] = {
72	[PACKAGESITE] = {
73		PKG_CONFIG_STRING,
74		"PACKAGESITE",
75		URL_SCHEME_PREFIX "http://pkg.FreeBSD.org/${ABI}/latest",
76		NULL,
77		NULL,
78		false,
79	},
80	[ABI] = {
81		PKG_CONFIG_STRING,
82		"ABI",
83		NULL,
84		NULL,
85		NULL,
86		false,
87	},
88	[MIRROR_TYPE] = {
89		PKG_CONFIG_STRING,
90		"MIRROR_TYPE",
91		"SRV",
92		NULL,
93		NULL,
94		false,
95	},
96	[ASSUME_ALWAYS_YES] = {
97		PKG_CONFIG_BOOL,
98		"ASSUME_ALWAYS_YES",
99		"NO",
100		NULL,
101		NULL,
102		false,
103	},
104	[SIGNATURE_TYPE] = {
105		PKG_CONFIG_STRING,
106		"SIGNATURE_TYPE",
107		NULL,
108		NULL,
109		NULL,
110		false,
111	},
112	[FINGERPRINTS] = {
113		PKG_CONFIG_STRING,
114		"FINGERPRINTS",
115		NULL,
116		NULL,
117		NULL,
118		false,
119	},
120	[REPOS_DIR] = {
121		PKG_CONFIG_LIST,
122		"REPOS_DIR",
123		NULL,
124		NULL,
125		NULL,
126		false,
127	},
128};
129
130static const char *
131elf_corres_to_string(struct _elf_corres *m, int e)
132{
133	int i;
134
135	for (i = 0; m[i].string != NULL; i++)
136		if (m[i].elf_nb == e)
137			return (m[i].string);
138
139	return ("unknown");
140}
141
142static const char *
143aeabi_parse_arm_attributes(void *data, size_t length)
144{
145	uint32_t sect_len;
146	uint8_t *section = data;
147
148#define	MOVE(len) do {            \
149	assert(length >= (len));  \
150	section += (len);         \
151	length -= (len);          \
152} while (0)
153
154	if (length == 0 || *section != 'A')
155		return (NULL);
156
157	MOVE(1);
158
159	/* Read the section length */
160	if (length < sizeof(sect_len))
161		return (NULL);
162
163	memcpy(&sect_len, section, sizeof(sect_len));
164
165	/*
166	 * The section length should be no longer than the section it is within
167	 */
168	if (sect_len > length)
169		return (NULL);
170
171	MOVE(sizeof(sect_len));
172
173	/* Skip the vendor name */
174	while (length != 0) {
175		if (*section == '\0')
176			break;
177		MOVE(1);
178	}
179	if (length == 0)
180		return (NULL);
181	MOVE(1);
182
183	while (length != 0) {
184		uint32_t tag_length;
185
186	switch(*section) {
187	case 1: /* Tag_File */
188		MOVE(1);
189		if (length < sizeof(tag_length))
190			return (NULL);
191		memcpy(&tag_length, section, sizeof(tag_length));
192		break;
193	case 2: /* Tag_Section */
194	case 3: /* Tag_Symbol */
195	default:
196		return (NULL);
197	}
198	/* At least space for the tag and size */
199	if (tag_length <= 5)
200		return (NULL);
201	tag_length--;
202	/* Check the tag fits */
203	if (tag_length > length)
204		return (NULL);
205
206#define  MOVE_TAG(len) do {           \
207	assert(tag_length >= (len));  \
208	MOVE(len);                    \
209	tag_length -= (len);          \
210} while(0)
211
212		MOVE(sizeof(tag_length));
213		tag_length -= sizeof(tag_length);
214
215		while (tag_length != 0) {
216			uint8_t tag;
217
218			assert(tag_length >= length);
219
220			tag = *section;
221			MOVE_TAG(1);
222
223			/*
224			 * These tag values come from:
225			 *
226			 * Addenda to, and Errata in, the ABI for the
227			 * ARM Architecture. Release 2.08, section 2.3.
228			 */
229			if (tag == 6) { /* == Tag_CPU_arch */
230				uint8_t val;
231
232				val = *section;
233				/*
234				 * We don't support values that require
235				 * more than one byte.
236				 */
237				if (val & (1 << 7))
238					return (NULL);
239
240				/* We have an ARMv4 or ARMv5 */
241				if (val <= 5)
242					return ("arm");
243				else /* We have an ARMv6+ */
244					return ("armv6");
245			} else if (tag == 4 || tag == 5 || tag == 32 ||
246			    tag == 65 || tag == 67) {
247				while (*section != '\0' && length != 0)
248					MOVE_TAG(1);
249				if (tag_length == 0)
250					return (NULL);
251				/* Skip the last byte */
252				MOVE_TAG(1);
253			} else if ((tag >= 7 && tag <= 31) || tag == 34 ||
254			    tag == 36 || tag == 38 || tag == 42 || tag == 44 ||
255			    tag == 64 || tag == 66 || tag == 68 || tag == 70) {
256				/* Skip the uleb128 data */
257				while (*section & (1 << 7) && length != 0)
258					MOVE_TAG(1);
259				if (tag_length == 0)
260					return (NULL);
261				/* Skip the last byte */
262				MOVE_TAG(1);
263			} else
264				return (NULL);
265#undef MOVE_TAG
266		}
267
268		break;
269	}
270	return (NULL);
271#undef MOVE
272}
273
274static int
275pkg_get_myabi(char *dest, size_t sz)
276{
277	Elf *elf;
278	Elf_Data *data;
279	Elf_Note note;
280	Elf_Scn *scn;
281	char *src, *osname;
282	const char *arch, *abi, *fpu, *endian_corres_str;
283	const char *wordsize_corres_str;
284	GElf_Ehdr elfhdr;
285	GElf_Shdr shdr;
286	int fd, i, ret;
287	uint32_t version;
288
289	version = 0;
290	ret = -1;
291	scn = NULL;
292	abi = NULL;
293
294	if (elf_version(EV_CURRENT) == EV_NONE) {
295		warnx("ELF library initialization failed: %s",
296		    elf_errmsg(-1));
297		return (-1);
298	}
299
300	if ((fd = open(_PATH_BSHELL, O_RDONLY)) < 0) {
301		warn("open()");
302		return (-1);
303	}
304
305	if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
306		ret = -1;
307		warnx("elf_begin() failed: %s.", elf_errmsg(-1));
308		goto cleanup;
309	}
310
311	if (gelf_getehdr(elf, &elfhdr) == NULL) {
312		ret = -1;
313		warn("getehdr() failed: %s.", elf_errmsg(-1));
314		goto cleanup;
315	}
316	while ((scn = elf_nextscn(elf, scn)) != NULL) {
317		if (gelf_getshdr(scn, &shdr) != &shdr) {
318			ret = -1;
319			warn("getshdr() failed: %s.", elf_errmsg(-1));
320			goto cleanup;
321		}
322
323		if (shdr.sh_type == SHT_NOTE)
324			break;
325	}
326
327	if (scn == NULL) {
328		ret = -1;
329		warn("failed to get the note section");
330		goto cleanup;
331	}
332
333	data = elf_getdata(scn, NULL);
334	src = data->d_buf;
335	for (;;) {
336		memcpy(&note, src, sizeof(Elf_Note));
337		src += sizeof(Elf_Note);
338		if (note.n_type == NT_VERSION)
339			break;
340		src += note.n_namesz + note.n_descsz;
341	}
342	osname = src;
343	src += roundup2(note.n_namesz, 4);
344	if (elfhdr.e_ident[EI_DATA] == ELFDATA2MSB)
345		version = be32dec(src);
346	else
347		version = le32dec(src);
348
349	for (i = 0; osname[i] != '\0'; i++)
350		osname[i] = (char)tolower(osname[i]);
351
352	wordsize_corres_str = elf_corres_to_string(wordsize_corres,
353	    (int)elfhdr.e_ident[EI_CLASS]);
354
355	arch = elf_corres_to_string(mach_corres, (int) elfhdr.e_machine);
356
357	snprintf(dest, sz, "%s:%d",
358	    osname, version / 100000);
359
360	ret = 0;
361
362	switch (elfhdr.e_machine) {
363	case EM_ARM:
364		endian_corres_str = elf_corres_to_string(endian_corres,
365		    (int)elfhdr.e_ident[EI_DATA]);
366
367		/* FreeBSD doesn't support the hard-float ABI yet */
368		fpu = "softfp";
369		if ((elfhdr.e_flags & 0xFF000000) != 0) {
370			const char *sh_name = NULL;
371			size_t shstrndx;
372
373			/* This is an EABI file, the conformance level is set */
374			abi = "eabi";
375			/* Find which TARGET_ARCH we are building for. */
376			elf_getshdrstrndx(elf, &shstrndx);
377			while ((scn = elf_nextscn(elf, scn)) != NULL) {
378				sh_name = NULL;
379				if (gelf_getshdr(scn, &shdr) != &shdr) {
380					scn = NULL;
381					break;
382				}
383
384				sh_name = elf_strptr(elf, shstrndx,
385				    shdr.sh_name);
386				if (sh_name == NULL)
387					continue;
388				if (strcmp(".ARM.attributes", sh_name) == 0)
389					break;
390			}
391			if (scn != NULL && sh_name != NULL) {
392				data = elf_getdata(scn, NULL);
393				/*
394				 * Prior to FreeBSD 10.0 libelf would return
395				 * NULL from elf_getdata on the .ARM.attributes
396				 * section. As this was the first release to
397				 * get armv6 support assume a NULL value means
398				 * arm.
399				 *
400				 * This assumption can be removed when 9.x
401				 * is unsupported.
402				 */
403				if (data != NULL) {
404					arch = aeabi_parse_arm_attributes(
405					    data->d_buf, data->d_size);
406					if (arch == NULL) {
407						ret = 1;
408						warn("unknown ARM ARCH");
409						goto cleanup;
410					}
411				}
412			} else {
413				ret = 1;
414				warn("Unable to find the .ARM.attributes "
415				    "section");
416				goto cleanup;
417			}
418		} else if (elfhdr.e_ident[EI_OSABI] != ELFOSABI_NONE) {
419			/*
420			 * EABI executables all have this field set to
421			 * ELFOSABI_NONE, therefore it must be an oabi file.
422			 */
423			abi = "oabi";
424		} else {
425			ret = 1;
426			warn("unknown ARM ABI");
427			goto cleanup;
428		}
429		snprintf(dest + strlen(dest), sz - strlen(dest),
430		    ":%s:%s:%s:%s:%s", arch, wordsize_corres_str,
431		    endian_corres_str, abi, fpu);
432		break;
433	case EM_MIPS:
434		/*
435		 * this is taken from binutils sources:
436		 * include/elf/mips.h
437		 * mapping is figured out from binutils:
438		 * gas/config/tc-mips.c
439		 */
440		switch (elfhdr.e_flags & EF_MIPS_ABI) {
441		case E_MIPS_ABI_O32:
442			abi = "o32";
443			break;
444		case E_MIPS_ABI_N32:
445			abi = "n32";
446			break;
447		default:
448			if (elfhdr.e_ident[EI_DATA] ==
449			    ELFCLASS32)
450				abi = "o32";
451			else if (elfhdr.e_ident[EI_DATA] ==
452			    ELFCLASS64)
453				abi = "n64";
454			break;
455		}
456		endian_corres_str = elf_corres_to_string(endian_corres,
457		    (int)elfhdr.e_ident[EI_DATA]);
458
459		snprintf(dest + strlen(dest), sz - strlen(dest), ":%s:%s:%s:%s",
460		    arch, wordsize_corres_str, endian_corres_str, abi);
461		break;
462	default:
463		snprintf(dest + strlen(dest), sz - strlen(dest), ":%s:%s",
464		    arch, wordsize_corres_str);
465	}
466
467cleanup:
468	if (elf != NULL)
469		elf_end(elf);
470
471	close(fd);
472	return (ret);
473}
474
475static void
476subst_packagesite(const char *abi)
477{
478	struct sbuf *newval;
479	const char *variable_string;
480	const char *oldval;
481
482	if (c[PACKAGESITE].value != NULL)
483		oldval = c[PACKAGESITE].value;
484	else
485		oldval = c[PACKAGESITE].val;
486
487	if ((variable_string = strstr(oldval, "${ABI}")) == NULL)
488		return;
489
490	newval = sbuf_new_auto();
491	sbuf_bcat(newval, oldval, variable_string - oldval);
492	sbuf_cat(newval, abi);
493	sbuf_cat(newval, variable_string + strlen("${ABI}"));
494	sbuf_finish(newval);
495
496	free(c[PACKAGESITE].value);
497	c[PACKAGESITE].value = strdup(sbuf_data(newval));
498}
499
500static int
501boolstr_to_bool(const char *str)
502{
503	if (str != NULL && (strcasecmp(str, "true") == 0 ||
504	    strcasecmp(str, "yes") == 0 || strcasecmp(str, "on") == 0 ||
505	    str[0] == '1'))
506		return (true);
507
508	return (false);
509}
510
511static void
512config_parse(ucl_object_t *obj, pkg_conf_file_t conftype)
513{
514	struct sbuf *buf = sbuf_new_auto();
515	ucl_object_t *cur, *seq;
516	ucl_object_iter_t it = NULL, itseq = NULL;
517	struct config_entry *temp_config;
518	struct config_value *cv;
519	const char *key;
520	int i;
521	size_t j;
522
523	/* Temporary config for configs that may be disabled. */
524	temp_config = calloc(CONFIG_SIZE, sizeof(struct config_entry));
525
526	while ((cur = ucl_iterate_object(obj, &it, true))) {
527		key = ucl_object_key(cur);
528		if (key == NULL)
529			continue;
530		sbuf_clear(buf);
531
532		if (conftype == CONFFILE_PKG) {
533			for (j = 0; j < strlen(key); ++j)
534				sbuf_putc(buf, key[j]);
535			sbuf_finish(buf);
536		} else if (conftype == CONFFILE_REPO) {
537			if (strcasecmp(key, "url") == 0)
538				sbuf_cpy(buf, "PACKAGESITE");
539			else if (strcasecmp(key, "mirror_type") == 0)
540				sbuf_cpy(buf, "MIRROR_TYPE");
541			else if (strcasecmp(key, "signature_type") == 0)
542				sbuf_cpy(buf, "SIGNATURE_TYPE");
543			else if (strcasecmp(key, "fingerprints") == 0)
544				sbuf_cpy(buf, "FINGERPRINTS");
545			else if (strcasecmp(key, "enabled") == 0) {
546				if ((cur->type != UCL_BOOLEAN) ||
547				    !ucl_object_toboolean(cur))
548					goto cleanup;
549			} else
550				continue;
551			sbuf_finish(buf);
552		}
553
554		for (i = 0; i < CONFIG_SIZE; i++) {
555			if (strcmp(sbuf_data(buf), c[i].key) == 0)
556				break;
557		}
558
559		/* Silently skip unknown keys to be future compatible. */
560		if (i == CONFIG_SIZE)
561			continue;
562
563		/* env has priority over config file */
564		if (c[i].envset)
565			continue;
566
567		/* Parse sequence value ["item1", "item2"] */
568		switch (c[i].type) {
569		case PKG_CONFIG_LIST:
570			if (cur->type != UCL_ARRAY) {
571				warnx("Skipping invalid array "
572				    "value for %s.\n", c[i].key);
573				continue;
574			}
575			temp_config[i].list =
576			    malloc(sizeof(*temp_config[i].list));
577			STAILQ_INIT(temp_config[i].list);
578
579			while ((seq = ucl_iterate_object(cur, &itseq, true))) {
580				if (seq->type != UCL_STRING)
581					continue;
582				cv = malloc(sizeof(struct config_value));
583				cv->value =
584				    strdup(ucl_object_tostring(seq));
585				STAILQ_INSERT_TAIL(temp_config[i].list, cv,
586				    next);
587			}
588			break;
589		default:
590			/* Normal string value. */
591			temp_config[i].value = strdup(ucl_object_tostring(cur));
592			break;
593		}
594	}
595
596	/* Repo is enabled, copy over all settings from temp_config. */
597	for (i = 0; i < CONFIG_SIZE; i++) {
598		if (c[i].envset)
599			continue;
600		switch (c[i].type) {
601		case PKG_CONFIG_LIST:
602			c[i].list = temp_config[i].list;
603			break;
604		default:
605			c[i].value = temp_config[i].value;
606			break;
607		}
608	}
609
610cleanup:
611	free(temp_config);
612	sbuf_delete(buf);
613}
614
615/*-
616 * Parse new repo style configs in style:
617 * Name:
618 *   URL:
619 *   MIRROR_TYPE:
620 * etc...
621 */
622static void
623parse_repo_file(ucl_object_t *obj)
624{
625	ucl_object_iter_t it = NULL;
626	ucl_object_t *cur;
627	const char *key;
628
629	while ((cur = ucl_iterate_object(obj, &it, true))) {
630		key = ucl_object_key(cur);
631
632		if (key == NULL)
633			continue;
634
635		if (cur->type != UCL_OBJECT)
636			continue;
637
638		config_parse(cur, CONFFILE_REPO);
639	}
640}
641
642
643static int
644read_conf_file(const char *confpath, pkg_conf_file_t conftype)
645{
646	struct ucl_parser *p;
647	ucl_object_t *obj = NULL;
648
649	p = ucl_parser_new(0);
650
651	if (!ucl_parser_add_file(p, confpath)) {
652		if (errno != ENOENT)
653			errx(EXIT_FAILURE, "Unable to parse configuration "
654			    "file %s: %s", confpath, ucl_parser_get_error(p));
655		ucl_parser_free(p);
656		/* no configuration present */
657		return (1);
658	}
659
660	obj = ucl_parser_get_object(p);
661	if (obj->type != UCL_OBJECT)
662		warnx("Invalid configuration format, ignoring the "
663		    "configuration file %s", confpath);
664	else {
665		if (conftype == CONFFILE_PKG)
666			config_parse(obj, conftype);
667		else if (conftype == CONFFILE_REPO)
668			parse_repo_file(obj);
669	}
670
671	ucl_object_free(obj);
672	ucl_parser_free(p);
673
674	return (0);
675}
676
677static int
678load_repositories(const char *repodir)
679{
680	struct dirent *ent;
681	DIR *d;
682	char *p;
683	size_t n;
684	char path[MAXPATHLEN];
685	int ret;
686
687	ret = 0;
688
689	if ((d = opendir(repodir)) == NULL)
690		return (1);
691
692	while ((ent = readdir(d))) {
693		/* Trim out 'repos'. */
694		if ((n = strlen(ent->d_name)) <= 5)
695			continue;
696		p = &ent->d_name[n - 5];
697		if (strcmp(p, ".conf") == 0) {
698			snprintf(path, sizeof(path), "%s%s%s",
699			    repodir,
700			    repodir[strlen(repodir) - 1] == '/' ? "" : "/",
701			    ent->d_name);
702			if (access(path, F_OK) == 0 &&
703			    read_conf_file(path, CONFFILE_REPO)) {
704				ret = 1;
705				goto cleanup;
706			}
707		}
708	}
709
710cleanup:
711	closedir(d);
712
713	return (ret);
714}
715
716int
717config_init(void)
718{
719	char *val;
720	int i;
721	const char *localbase;
722	char *env_list_item;
723	char confpath[MAXPATHLEN];
724	struct config_value *cv;
725	char abi[BUFSIZ];
726
727	for (i = 0; i < CONFIG_SIZE; i++) {
728		val = getenv(c[i].key);
729		if (val != NULL) {
730			c[i].envset = true;
731			switch (c[i].type) {
732			case PKG_CONFIG_LIST:
733				/* Split up comma-separated items from env. */
734				c[i].list = malloc(sizeof(*c[i].list));
735				STAILQ_INIT(c[i].list);
736				for (env_list_item = strtok(val, ",");
737				    env_list_item != NULL;
738				    env_list_item = strtok(NULL, ",")) {
739					cv =
740					    malloc(sizeof(struct config_value));
741					cv->value =
742					    strdup(env_list_item);
743					STAILQ_INSERT_TAIL(c[i].list, cv,
744					    next);
745				}
746				break;
747			default:
748				c[i].val = val;
749				break;
750			}
751		}
752	}
753
754	/* Read LOCALBASE/etc/pkg.conf first. */
755	localbase = getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE;
756	snprintf(confpath, sizeof(confpath), "%s/etc/pkg.conf",
757	    localbase);
758
759	if (access(confpath, F_OK) == 0 && read_conf_file(confpath,
760	    CONFFILE_PKG))
761		goto finalize;
762
763	/* Then read in all repos from REPOS_DIR list of directories. */
764	if (c[REPOS_DIR].list == NULL) {
765		c[REPOS_DIR].list = malloc(sizeof(*c[REPOS_DIR].list));
766		STAILQ_INIT(c[REPOS_DIR].list);
767		cv = malloc(sizeof(struct config_value));
768		cv->value = strdup("/etc/pkg");
769		STAILQ_INSERT_TAIL(c[REPOS_DIR].list, cv, next);
770		cv = malloc(sizeof(struct config_value));
771		if (asprintf(&cv->value, "%s/etc/pkg/repos", localbase) < 0)
772			goto finalize;
773		STAILQ_INSERT_TAIL(c[REPOS_DIR].list, cv, next);
774	}
775
776	STAILQ_FOREACH(cv, c[REPOS_DIR].list, next)
777		if (load_repositories(cv->value))
778			goto finalize;
779
780finalize:
781	if (c[ABI].val == NULL && c[ABI].value == NULL) {
782		if (pkg_get_myabi(abi, BUFSIZ) != 0)
783			errx(EXIT_FAILURE, "Failed to determine the system "
784			    "ABI");
785		c[ABI].val = abi;
786	}
787
788	subst_packagesite(c[ABI].value != NULL ? c[ABI].value : c[ABI].val);
789
790	return (0);
791}
792
793int
794config_string(pkg_config_key k, const char **val)
795{
796	if (c[k].type != PKG_CONFIG_STRING)
797		return (-1);
798
799	if (c[k].value != NULL)
800		*val = c[k].value;
801	else
802		*val = c[k].val;
803
804	return (0);
805}
806
807int
808config_bool(pkg_config_key k, bool *val)
809{
810	const char *value;
811
812	if (c[k].type != PKG_CONFIG_BOOL)
813		return (-1);
814
815	*val = false;
816
817	if (c[k].value != NULL)
818		value = c[k].value;
819	else
820		value = c[k].val;
821
822	if (boolstr_to_bool(value))
823		*val = true;
824
825	return (0);
826}
827
828void
829config_finish(void) {
830	int i;
831
832	for (i = 0; i < CONFIG_SIZE; i++)
833		free(c[i].value);
834}
835