[people/ms/systemd.git] / conf-parser.c

/*-*- Mode: C; c-basic-offset: 8 -*-*/

#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <stdlib.h>

#include "conf-parser.h"
#include "util.h"
#include "macro.h"
#include "strv.h"
#include "log.h"

#define WHITESPACE " \t\n"
#define COMMENTS "#;\n"
#define LINE_MAX 4096

/* Run the user supplied parser for an assignment */
static int next_assignment(
                const char *filename,
                unsigned line,
                const char *section,
                const ConfigItem *t,
                const char *lvalue,
                const char *rvalue,
                void *userdata) {

        assert(filename);
        assert(t);
        assert(lvalue);
        assert(rvalue);

        for (; t->parse; t++) {

                if (t->lvalue && !streq(lvalue, t->lvalue))
                        continue;

                if (t->section && !section)
                        continue;

                if (t->section && !streq(section, t->section))
                        continue;

                return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata);
        }

        log_error("[%s:%u] Unknown lvalue '%s' in section '%s'.", filename, line, lvalue, strna(section));
        return -EBADMSG;
}

/* Returns non-zero when c is contained in s */
static int in_string(char c, const char *s) {
        assert(s);

        for (; *s; s++)
                if (*s == c)
                        return 1;

        return 0;
}

/* Remove all whitepsapce from the beginning and the end of *s. *s may
 * be modified. */
static char *strip(char *s) {
        char *b = s+strspn(s, WHITESPACE);
        char *e, *l = NULL;

        for (e = b; *e; e++)
                if (!in_string(*e, WHITESPACE))
                        l = e;

        if (l)
                *(l+1) = 0;

        return b;
}

/* Parse a variable assignment line */
static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, char *l, void *userdata) {
        char *e, *c, *b;

        b = l+strspn(l, WHITESPACE);

        if ((c = strpbrk(b, COMMENTS)))
                *c = 0;

        if (!*b)
                return 0;

        if (startswith(b, ".include ")) {
                char *path = NULL, *fn;
                int r;

                fn = strip(b+9);
                if (!is_path_absolute(fn)) {
                        const char *k;

                        if ((k = strrchr(filename, '/'))) {
                                char *dir;

                                if (!(dir = strndup(filename, k-filename)))
                                        return -ENOMEM;

                                if (asprintf(&path, "%s/%s", dir, fn) < 0)
                                        return -errno;

                                fn = path;
                                free(dir);
                        }
                }

                r = config_parse(fn, sections, t, userdata);
                free(path);
                return r;
        }

        if (*b == '[') {
                size_t k;
                char *n;

                k = strlen(b);
                assert(k > 0);

                if (b[k-1] != ']') {
                        log_error("[%s:%u] Invalid section header.", filename, line);
                        return -EBADMSG;
                }

                if (!(n = strndup(b+1, k-2)))
                        return -ENOMEM;

                if (sections) {
                        const char * const * i;
                        bool good = false;
                        STRV_FOREACH(i, sections)
                                if (streq(*i, n)) {
                                        good = true;
                                        break;
                                }

                        if (!good) {
                                free(n);
                                return -EBADMSG;
                        }
                }

                free(*section);
                *section = n;

                return 0;
        }

        if (!(e = strchr(b, '='))) {
                log_error("[%s:%u] Missing '='.", filename, line);
                return -EBADMSG;
        }

        *e = 0;
        e++;

        return next_assignment(filename, line, *section, t, strip(b), strip(e), userdata);
}

/* Go through the file and parse each line */
int config_parse(const char *filename, const char* const * sections, const ConfigItem *t, void *userdata) {
        unsigned line = 0;
        char *section = NULL;
        FILE *f;
        int r;

        assert(filename);
        assert(t);

        if (!(f = fopen(filename, "re"))) {
                r = -errno;
                log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
                goto finish;
        }

        while (!feof(f)) {
                char l[LINE_MAX];

                if (!fgets(l, sizeof(l), f)) {
                        if (feof(f))
                                break;

                        r = -errno;
                        log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
                        goto finish;
                }

                if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
                        goto finish;
        }

        r = 0;

finish:
        free(section);

        if (f)
                fclose(f);

        return r;
}

int config_parse_int(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        int *i = data;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if ((r = safe_atoi(rvalue, i)) < 0) {
                log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
                return r;
        }

        return 0;
}

int config_parse_unsigned(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        unsigned *u = data;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if ((r = safe_atou(rvalue, u)) < 0) {
                log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
                return r;
        }

        return 0;
}

int config_parse_size(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        size_t *sz = data;
        unsigned u;
        int r;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if ((r = safe_atou(rvalue, &u)) < 0) {
                log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
                return r;
        }

        *sz = (size_t) u;
        return 0;
}

int config_parse_bool(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        int k;
        bool *b = data;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if ((k = parse_boolean(rvalue)) < 0) {
                log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
                return k;
        }

        *b = !!k;
        return 0;
}

int config_parse_string(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        char **s = data;
        char *n;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if (*rvalue) {
                if (!(n = strdup(rvalue)))
                        return -ENOMEM;
        } else
                n = NULL;

        free(*s);
        *s = n;

        return 0;
}

int config_parse_path(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        char **s = data;
        char *n;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        if (*rvalue != '/') {
                log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
                return -EINVAL;
        }

        if (!(n = strdup(rvalue)))
                return -ENOMEM;

        free(*s);
        *s = n;

        return 0;
}

int config_parse_strv(
                const char *filename,
                unsigned line,
                const char *section,
                const char *lvalue,
                const char *rvalue,
                void *data,
                void *userdata) {

        char*** sv = data;
        char **n;
        char *w;
        unsigned k;
        size_t l;
        char *state;

        assert(filename);
        assert(lvalue);
        assert(rvalue);
        assert(data);

        k = strv_length(*sv);
        FOREACH_WORD_QUOTED(w, l, rvalue, state)
                k++;

        if (!(n = new(char*, k+1)))
                return -ENOMEM;

        for (k = 0; (*sv)[k]; k++)
                n[k] = (*sv)[k];
        FOREACH_WORD_QUOTED(w, l, rvalue, state)
                if (!(n[k++] = strndup(w, l)))
                        goto fail;

        n[k] = NULL;
        free(*sv);
        *sv = n;

        return 0;

fail:
        for (; k > 0; k--)
                free(n[k-1]);
        free(n);

        return -ENOMEM;
}
Commit	Line	Data
ed5bcfbe LP	1	/-- Mode: C; c-basic-offset: 8 --/
	2
	3	#include <string.h>
	4	#include <stdio.h>
	5	#include <errno.h>
	6	#include <assert.h>
	7	#include <stdlib.h>
	8
	9	#include "conf-parser.h"
	10	#include "util.h"
	11	#include "macro.h"
57d42a5f	12	#include "strv.h"
16354eff	13	#include "log.h"
ed5bcfbe LP	14
	15	#define WHITESPACE " \t\n"
	16	#define COMMENTS "#;\n"
	17	#define LINE_MAX 4096
	18
	19	/* Run the user supplied parser for an assignment */
	20	static int next_assignment(
	21	const char *filename,
	22	unsigned line,
	23	const char *section,
	24	const ConfigItem *t,
	25	const char *lvalue,
	26	const char *rvalue,
	27	void *userdata) {
	28
	29	assert(filename);
	30	assert(t);
	31	assert(lvalue);
	32	assert(rvalue);
	33
	34	for (; t->parse; t++) {
	35
	36	if (t->lvalue && !streq(lvalue, t->lvalue))
	37	continue;
	38
	39	if (t->section && !section)
	40	continue;
	41
	42	if (t->section && !streq(section, t->section))
	43	continue;
	44
	45	return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata);
	46	}
	47
16354eff	48	log_error("[%s:%u] Unknown lvalue '%s' in section '%s'.", filename, line, lvalue, strna(section));
ed5bcfbe LP	49	return -EBADMSG;
	50	}
	51
	52	/* Returns non-zero when c is contained in s */
	53	static int in_string(char c, const char *s) {
	54	assert(s);
	55
	56	for (; *s; s++)
	57	if (*s == c)
	58	return 1;
	59
	60	return 0;
	61	}
	62
	63	/* Remove all whitepsapce from the beginning and the end of s. s may
	64	* be modified. */
	65	static char strip(char s) {
	66	char *b = s+strspn(s, WHITESPACE);
	67	char e, l = NULL;
	68
	69	for (e = b; *e; e++)
	70	if (!in_string(*e, WHITESPACE))
	71	l = e;
	72
	73	if (l)
	74	*(l+1) = 0;
	75
	76	return b;
	77	}
	78
	79	/* Parse a variable assignment line */
42f4e3c4	80	static int parse_line(const char filename, unsigned line, char section, const char const * sections, const ConfigItem t, char l, void *userdata) {
ed5bcfbe LP	81	char e, c, *b;
	82
	83	b = l+strspn(l, WHITESPACE);
	84
	85	if ((c = strpbrk(b, COMMENTS)))
	86	*c = 0;
	87
	88	if (!*b)
	89	return 0;
	90
	91	if (startswith(b, ".include ")) {
	92	char path = NULL, fn;
	93	int r;
	94
	95	fn = strip(b+9);
	96	if (!is_path_absolute(fn)) {
	97	const char *k;
	98
	99	if ((k = strrchr(filename, '/'))) {
	100	char *dir;
	101
	102	if (!(dir = strndup(filename, k-filename)))
	103	return -ENOMEM;
	104
	105	if (asprintf(&path, "%s/%s", dir, fn) < 0)
	106	return -errno;
	107
	108	fn = path;
	109	free(dir);
	110	}
	111	}
	112
42f4e3c4	113	r = config_parse(fn, sections, t, userdata);
ed5bcfbe LP	114	free(path);
	115	return r;
	116	}
	117
	118	if (*b == '[') {
	119	size_t k;
	120	char *n;
	121
	122	k = strlen(b);
	123	assert(k > 0);
	124
	125	if (b[k-1] != ']') {
16354eff	126	log_error("[%s:%u] Invalid section header.", filename, line);
ed5bcfbe LP	127	return -EBADMSG;
	128	}
	129
	130	if (!(n = strndup(b+1, k-2)))
	131	return -ENOMEM;
	132
42f4e3c4 LP	133	if (sections) {
	134	const char * const * i;
	135	bool good = false;
	136	STRV_FOREACH(i, sections)
	137	if (streq(*i, n)) {
	138	good = true;
	139	break;
	140	}
	141
	142	if (!good) {
	143	free(n);
	144	return -EBADMSG;
	145	}
	146	}
	147
ed5bcfbe LP	148	free(*section);
	149	*section = n;
	150
	151	return 0;
	152	}
	153
	154	if (!(e = strchr(b, '='))) {
16354eff	155	log_error("[%s:%u] Missing '='.", filename, line);
ed5bcfbe LP	156	return -EBADMSG;
	157	}
	158
	159	*e = 0;
	160	e++;
	161
	162	return next_assignment(filename, line, *section, t, strip(b), strip(e), userdata);
	163	}
	164
	165	/* Go through the file and parse each line */
42f4e3c4	166	int config_parse(const char filename, const char const * sections, const ConfigItem t, void userdata) {
ed5bcfbe LP	167	unsigned line = 0;
	168	char *section = NULL;
	169	FILE *f;
	170	int r;
	171
	172	assert(filename);
	173	assert(t);
	174
	175	if (!(f = fopen(filename, "re"))) {
	176	r = -errno;
16354eff	177	log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
ed5bcfbe LP	178	goto finish;
	179	}
	180
	181	while (!feof(f)) {
	182	char l[LINE_MAX];
	183
	184	if (!fgets(l, sizeof(l), f)) {
	185	if (feof(f))
	186	break;
	187
	188	r = -errno;
16354eff	189	log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
ed5bcfbe LP	190	goto finish;
	191	}
	192
42f4e3c4	193	if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
ed5bcfbe LP	194	goto finish;
	195	}
	196
	197	r = 0;
	198
	199	finish:
	200	free(section);
	201
	202	if (f)
	203	fclose(f);
	204
	205	return r;
	206	}
	207
	208	int config_parse_int(
	209	const char *filename,
	210	unsigned line,
	211	const char *section,
	212	const char *lvalue,
	213	const char *rvalue,
	214	void *data,
	215	void *userdata) {
	216
	217	int *i = data;
	218	int r;
	219
	220	assert(filename);
	221	assert(lvalue);
	222	assert(rvalue);
	223	assert(data);
	224
	225	if ((r = safe_atoi(rvalue, i)) < 0) {
16354eff	226	log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
ed5bcfbe LP	227	return r;
	228	}
	229
	230	return 0;
	231	}
	232
	233	int config_parse_unsigned(
	234	const char *filename,
	235	unsigned line,
	236	const char *section,
	237	const char *lvalue,
	238	const char *rvalue,
	239	void *data,
	240	void *userdata) {
	241
	242	unsigned *u = data;
	243	int r;
	244
	245	assert(filename);
	246	assert(lvalue);
	247	assert(rvalue);
	248	assert(data);
	249
	250	if ((r = safe_atou(rvalue, u)) < 0) {
16354eff	251	log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
ed5bcfbe LP	252	return r;
	253	}
	254
	255	return 0;
	256	}
	257
	258	int config_parse_size(
	259	const char *filename,
	260	unsigned line,
	261	const char *section,
	262	const char *lvalue,
	263	const char *rvalue,
	264	void *data,
	265	void *userdata) {
	266
	267	size_t *sz = data;
	268	unsigned u;
	269	int r;
	270
	271	assert(filename);
	272	assert(lvalue);
	273	assert(rvalue);
	274	assert(data);
	275
	276	if ((r = safe_atou(rvalue, &u)) < 0) {
16354eff	277	log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
ed5bcfbe LP	278	return r;
	279	}
	280
	281	*sz = (size_t) u;
	282	return 0;
	283	}
	284
	285	int config_parse_bool(
	286	const char *filename,
	287	unsigned line,
	288	const char *section,
	289	const char *lvalue,
	290	const char *rvalue,
	291	void *data,
	292	void *userdata) {
	293
	294	int k;
	295	bool *b = data;
	296
	297	assert(filename);
	298	assert(lvalue);
	299	assert(rvalue);
	300	assert(data);
	301
	302	if ((k = parse_boolean(rvalue)) < 0) {
16354eff	303	log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
ed5bcfbe LP	304	return k;
	305	}
	306
	307	*b = !!k;
	308	return 0;
	309	}
	310
	311	int config_parse_string(
	312	const char *filename,
	313	unsigned line,
	314	const char *section,
	315	const char *lvalue,
	316	const char *rvalue,
	317	void *data,
	318	void *userdata) {
	319
	320	char **s = data;
	321	char *n;
	322
	323	assert(filename);
	324	assert(lvalue);
	325	assert(rvalue);
	326	assert(data);
	327
	328	if (*rvalue) {
	329	if (!(n = strdup(rvalue)))
	330	return -ENOMEM;
	331	} else
	332	n = NULL;
	333
	334	free(*s);
	335	*s = n;
	336
	337	return 0;
	338	}
57d42a5f	339
034c6ed7 LP	340	int config_parse_path(
	341	const char *filename,
	342	unsigned line,
	343	const char *section,
	344	const char *lvalue,
	345	const char *rvalue,
	346	void *data,
	347	void *userdata) {
	348
	349	char **s = data;
	350	char *n;
	351
	352	assert(filename);
	353	assert(lvalue);
	354	assert(rvalue);
	355	assert(data);
	356
	357	if (*rvalue != '/') {
	358	log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
	359	return -EINVAL;
	360	}
	361
	362	if (!(n = strdup(rvalue)))
	363	return -ENOMEM;
	364
	365	free(*s);
	366	*s = n;
	367
	368	return 0;
	369	}
57d42a5f LP	370
	371	int config_parse_strv(
	372	const char *filename,
	373	unsigned line,
	374	const char *section,
	375	const char *lvalue,
	376	const char *rvalue,
	377	void *data,
	378	void *userdata) {
	379
	380	char*** sv = data;
	381	char **n;
	382	char *w;
	383	unsigned k;
	384	size_t l;
	385	char *state;
	386
	387	assert(filename);
	388	assert(lvalue);
	389	assert(rvalue);
	390	assert(data);
	391
	392	k = strv_length(*sv);
034c6ed7	393	FOREACH_WORD_QUOTED(w, l, rvalue, state)
57d42a5f LP	394	k++;
	395
	396	if (!(n = new(char*, k+1)))
	397	return -ENOMEM;
	398
	399	for (k = 0; (*sv)[k]; k++)
	400	n[k] = (*sv)[k];
034c6ed7	401	FOREACH_WORD_QUOTED(w, l, rvalue, state)
57d42a5f LP	402	if (!(n[k++] = strndup(w, l)))
	403	goto fail;
	404
	405	n[k] = NULL;
	406	free(*sv);
	407	*sv = n;
	408
	409	return 0;
	410
	411	fail:
	412	for (; k > 0; k--)
	413	free(n[k-1]);
034c6ed7	414	free(n);
57d42a5f LP	415
	416	return -ENOMEM;
	417	}