[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 COMMENTS "#;\n"
#define NEWLINES "\n\r"
#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_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
        return 0;
}

/* 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, *b, *c;

        b = l+strspn(l, WHITESPACE);

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

        if (!*b)
                return 0;

        if (strchr(COMMENTS, *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, NULL, 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, FILE *f, const char* const * sections, const ConfigItem *t, void *userdata) {
        unsigned line = 0;
        char *section = NULL;
        int r;

        assert(filename);
        assert(t);

        if (!f) {
                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	14
ed5bcfbe	15	#define COMMENTS "#;\n"
1ea86b18	16	#define NEWLINES "\n\r"
ed5bcfbe LP	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
f1857be0 LP	48	log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
f1857be0 LP	49	return 0;
ed5bcfbe LP	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) {
1ea86b18	81	char e, b, *c;
ed5bcfbe LP	82
	83	b = l+strspn(l, WHITESPACE);
	84
1ea86b18	85	if ((c = strpbrk(b, NEWLINES)))
ed5bcfbe LP	86	*c = 0;
	87
	88	if (!*b)
	89	return 0;
1ea86b18 LP	90
	91	if (strchr(COMMENTS, *b))
	92	return 0;
ed5bcfbe LP	93
	94	if (startswith(b, ".include ")) {
	95	char path = NULL, fn;
	96	int r;
	97
	98	fn = strip(b+9);
	99	if (!is_path_absolute(fn)) {
	100	const char *k;
	101
	102	if ((k = strrchr(filename, '/'))) {
	103	char *dir;
	104
	105	if (!(dir = strndup(filename, k-filename)))
	106	return -ENOMEM;
	107
	108	if (asprintf(&path, "%s/%s", dir, fn) < 0)
	109	return -errno;
	110
	111	fn = path;
	112	free(dir);
	113	}
	114	}
	115
87f0e418	116	r = config_parse(fn, NULL, sections, t, userdata);
ed5bcfbe LP	117	free(path);
	118	return r;
	119	}
	120
	121	if (*b == '[') {
	122	size_t k;
	123	char *n;
	124
	125	k = strlen(b);
	126	assert(k > 0);
	127
	128	if (b[k-1] != ']') {
16354eff	129	log_error("[%s:%u] Invalid section header.", filename, line);
ed5bcfbe LP	130	return -EBADMSG;
	131	}
	132
	133	if (!(n = strndup(b+1, k-2)))
	134	return -ENOMEM;
	135
42f4e3c4 LP	136	if (sections) {
	137	const char * const * i;
	138	bool good = false;
	139	STRV_FOREACH(i, sections)
	140	if (streq(*i, n)) {
	141	good = true;
	142	break;
	143	}
	144
	145	if (!good) {
	146	free(n);
	147	return -EBADMSG;
	148	}
	149	}
	150
ed5bcfbe LP	151	free(*section);
	152	*section = n;
	153
	154	return 0;
	155	}
	156
	157	if (!(e = strchr(b, '='))) {
16354eff	158	log_error("[%s:%u] Missing '='.", filename, line);
ed5bcfbe LP	159	return -EBADMSG;
	160	}
	161
	162	*e = 0;
	163	e++;
	164
	165	return next_assignment(filename, line, *section, t, strip(b), strip(e), userdata);
	166	}
	167
	168	/* Go through the file and parse each line */
87f0e418	169	int config_parse(const char filename, FILE f, const char* const * sections, const ConfigItem t, void userdata) {
ed5bcfbe LP	170	unsigned line = 0;
ed5bcfbe LP	171	char *section = NULL;
ed5bcfbe LP	172	int r;
	173
	174	assert(filename);
	175	assert(t);
	176
87f0e418 LP	177	if (!f) {
	178	if (!(f = fopen(filename, "re"))) {
	179	r = -errno;
	180	log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
	181	goto finish;
	182	}
ed5bcfbe LP	183	}
	184
	185	while (!feof(f)) {
	186	char l[LINE_MAX];
	187
	188	if (!fgets(l, sizeof(l), f)) {
	189	if (feof(f))
	190	break;
	191
	192	r = -errno;
16354eff	193	log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
ed5bcfbe LP	194	goto finish;
	195	}
	196
42f4e3c4	197	if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
ed5bcfbe LP	198	goto finish;
	199	}
	200
	201	r = 0;
	202
	203	finish:
	204	free(section);
	205
	206	if (f)
	207	fclose(f);
	208
	209	return r;
	210	}
	211
	212	int config_parse_int(
	213	const char *filename,
	214	unsigned line,
	215	const char *section,
	216	const char *lvalue,
	217	const char *rvalue,
	218	void *data,
	219	void *userdata) {
	220
	221	int *i = data;
	222	int r;
	223
	224	assert(filename);
	225	assert(lvalue);
	226	assert(rvalue);
	227	assert(data);
	228
	229	if ((r = safe_atoi(rvalue, i)) < 0) {
16354eff	230	log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
ed5bcfbe LP	231	return r;
	232	}
	233
	234	return 0;
	235	}
	236
	237	int config_parse_unsigned(
	238	const char *filename,
	239	unsigned line,
	240	const char *section,
	241	const char *lvalue,
	242	const char *rvalue,
	243	void *data,
	244	void *userdata) {
	245
	246	unsigned *u = data;
	247	int r;
	248
	249	assert(filename);
	250	assert(lvalue);
	251	assert(rvalue);
	252	assert(data);
	253
	254	if ((r = safe_atou(rvalue, u)) < 0) {
16354eff	255	log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
ed5bcfbe LP	256	return r;
	257	}
	258
	259	return 0;
	260	}
	261
	262	int config_parse_size(
	263	const char *filename,
	264	unsigned line,
	265	const char *section,
	266	const char *lvalue,
	267	const char *rvalue,
	268	void *data,
	269	void *userdata) {
	270
	271	size_t *sz = data;
	272	unsigned u;
	273	int r;
	274
	275	assert(filename);
	276	assert(lvalue);
	277	assert(rvalue);
	278	assert(data);
	279
	280	if ((r = safe_atou(rvalue, &u)) < 0) {
16354eff	281	log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
ed5bcfbe LP	282	return r;
	283	}
	284
	285	*sz = (size_t) u;
	286	return 0;
	287	}
	288
	289	int config_parse_bool(
	290	const char *filename,
	291	unsigned line,
	292	const char *section,
	293	const char *lvalue,
	294	const char *rvalue,
	295	void *data,
	296	void *userdata) {
	297
	298	int k;
	299	bool *b = data;
	300
	301	assert(filename);
	302	assert(lvalue);
	303	assert(rvalue);
	304	assert(data);
	305
	306	if ((k = parse_boolean(rvalue)) < 0) {
16354eff	307	log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
ed5bcfbe LP	308	return k;
	309	}
	310
	311	*b = !!k;
	312	return 0;
	313	}
	314
	315	int config_parse_string(
	316	const char *filename,
	317	unsigned line,
	318	const char *section,
	319	const char *lvalue,
	320	const char *rvalue,
	321	void *data,
	322	void *userdata) {
	323
	324	char **s = data;
	325	char *n;
	326
	327	assert(filename);
	328	assert(lvalue);
	329	assert(rvalue);
	330	assert(data);
	331
	332	if (*rvalue) {
	333	if (!(n = strdup(rvalue)))
	334	return -ENOMEM;
	335	} else
	336	n = NULL;
	337
	338	free(*s);
	339	*s = n;
	340
	341	return 0;
	342	}
57d42a5f	343
034c6ed7 LP	344	int config_parse_path(
	345	const char *filename,
	346	unsigned line,
	347	const char *section,
	348	const char *lvalue,
	349	const char *rvalue,
	350	void *data,
	351	void *userdata) {
	352
	353	char **s = data;
	354	char *n;
	355
	356	assert(filename);
	357	assert(lvalue);
	358	assert(rvalue);
	359	assert(data);
	360
	361	if (*rvalue != '/') {
	362	log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
	363	return -EINVAL;
	364	}
	365
	366	if (!(n = strdup(rvalue)))
	367	return -ENOMEM;
	368
	369	free(*s);
	370	*s = n;
	371
	372	return 0;
	373	}
57d42a5f LP	374
	375	int config_parse_strv(
	376	const char *filename,
	377	unsigned line,
	378	const char *section,
	379	const char *lvalue,
	380	const char *rvalue,
	381	void *data,
	382	void *userdata) {
	383
	384	char*** sv = data;
	385	char **n;
	386	char *w;
	387	unsigned k;
	388	size_t l;
	389	char *state;
	390
	391	assert(filename);
	392	assert(lvalue);
	393	assert(rvalue);
	394	assert(data);
	395
	396	k = strv_length(*sv);
034c6ed7	397	FOREACH_WORD_QUOTED(w, l, rvalue, state)
57d42a5f LP	398	k++;
	399
	400	if (!(n = new(char*, k+1)))
	401	return -ENOMEM;
	402
	403	for (k = 0; (*sv)[k]; k++)
	404	n[k] = (*sv)[k];
034c6ed7	405	FOREACH_WORD_QUOTED(w, l, rvalue, state)
57d42a5f LP	406	if (!(n[k++] = strndup(w, l)))
	407	goto fail;
	408
	409	n[k] = NULL;
	410	free(*sv);
	411	*sv = n;
	412
	413	return 0;
	414
	415	fail:
	416	for (; k > 0; k--)
	417	free(n[k-1]);
034c6ed7	418	free(n);
57d42a5f LP	419
	420	return -ENOMEM;
	421	}