conf-parser.c revision 2b583ce6576d4a074ce6f1570b3e60b65c64ae7d
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#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"
/* Run the user supplied parser for an assignment */
static int next_assignment(
const char *filename,
unsigned line,
const char *section,
const ConfigItem *t,
bool relaxed,
const char *lvalue,
const char *rvalue,
void *userdata) {
assert(filename);
assert(t);
assert(lvalue);
assert(rvalue);
for (; t->parse || t->lvalue; t++) {
if (t->lvalue && !streq(lvalue, t->lvalue))
continue;
if (t->section && !section)
continue;
if (t->section && !streq(section, t->section))
continue;
if (!t->parse)
return 0;
return t->parse(filename, line, section, lvalue, t->ltype, rvalue, t->data, userdata);
}
/* Warn about unknown non-extension fields. */
if (!relaxed && !startswith(lvalue, "X-"))
log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
return 0;
}
/* Parse a variable assignment line */
static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, bool relaxed, char *l, void *userdata) {
char *e;
l = strstrip(l);
if (!*l)
return 0;
if (strchr(COMMENTS, *l))
return 0;
if (startswith(l, ".include ")) {
char *fn;
int r;
if (!(fn = file_in_same_dir(filename, strstrip(l+9))))
return -ENOMEM;
r = config_parse(fn, NULL, sections, t, relaxed, userdata);
free(fn);
return r;
}
if (*l == '[') {
size_t k;
char *n;
k = strlen(l);
assert(k > 0);
if (l[k-1] != ']') {
log_error("[%s:%u] Invalid section header.", filename, line);
return -EBADMSG;
}
if (!(n = strndup(l+1, k-2)))
return -ENOMEM;
if (!relaxed && sections && !strv_contains((char**) sections, n))
log_info("[%s:%u] Unknown section '%s'. Ignoring.", filename, line, n);
free(*section);
*section = n;
return 0;
}
if (sections && (!*section || !strv_contains((char**) sections, *section)))
return 0;
if (!(e = strchr(l, '='))) {
log_error("[%s:%u] Missing '='.", filename, line);
return -EBADMSG;
}
*e = 0;
e++;
return next_assignment(filename, line, *section, t, relaxed, strstrip(l), strstrip(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, bool relaxed, void *userdata) {
unsigned line = 0;
char *section = NULL;
int r;
bool ours = false;
char *continuation = NULL;
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;
}
ours = true;
}
while (!feof(f)) {
char l[LINE_MAX], *p, *c = NULL, *e;
bool escaped = false;
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;
}
truncate_nl(l);
if (continuation) {
if (!(c = strappend(continuation, l))) {
r = -ENOMEM;
goto finish;
}
free(continuation);
continuation = NULL;
p = c;
} else
p = l;
for (e = p; *e; e++) {
if (escaped)
escaped = false;
else if (*e == '\\')
escaped = true;
}
if (escaped) {
*(e-1) = ' ';
if (c)
continuation = c;
else if (!(continuation = strdup(l))) {
r = -ENOMEM;
goto finish;
}
continue;
}
r = parse_line(filename, ++line, &section, sections, t, relaxed, p, userdata);
free(c);
if (r < 0)
goto finish;
}
r = 0;
finish:
free(section);
free(continuation);
if (f && ours)
fclose(f);
return r;
}
int config_parse_int(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
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_uint64(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
uint64_t *u = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if ((r = safe_atou64(rvalue, u)) < 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,
int ltype,
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,
int ltype,
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,
int ltype,
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,
int ltype,
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,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char **s = data;
char *n;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (!path_is_absolute(rvalue)) {
log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
return -EINVAL;
}
if (!(n = strdup(rvalue)))
return -ENOMEM;
path_kill_slashes(n);
free(*s);
*s = n;
return 0;
}
int config_parse_strv(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
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;
if (*sv)
for (k = 0; (*sv)[k]; k++)
n[k] = (*sv)[k];
else
k = 0;
FOREACH_WORD_QUOTED(w, l, rvalue, state)
if (!(n[k++] = cunescape_length(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;
}
int config_parse_path_strv(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char*** sv = data;
char **n;
char *w;
unsigned k;
size_t l;
char *state;
int r;
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;
k = 0;
if (*sv)
for (; (*sv)[k]; k++)
n[k] = (*sv)[k];
FOREACH_WORD_QUOTED(w, l, rvalue, state) {
if (!(n[k] = cunescape_length(w, l))) {
r = -ENOMEM;
goto fail;
}
if (!path_is_absolute(n[k])) {
log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
r = -EINVAL;
goto fail;
}
path_kill_slashes(n[k]);
k++;
}
n[k] = NULL;
free(*sv);
*sv = n;
return 0;
fail:
free(n[k]);
for (; k > 0; k--)
free(n[k-1]);
free(n);
return r;
}