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systemd/src/shared/conf-parser.c

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/*-*- 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 Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include "conf-parser.h"
#include "conf-files.h"
#include "util.h"
#include "macro.h"
#include "strv.h"
#include "log.h"
#include "utf8.h"
#include "path-util.h"
#include "sd-messages.h"
int config_item_table_lookup(
const void *table,
const char *section,
const char *lvalue,
ConfigParserCallback *func,
int *ltype,
void **data,
void *userdata) {
const ConfigTableItem *t;
assert(table);
assert(lvalue);
assert(func);
assert(ltype);
assert(data);
for (t = table; t->lvalue; t++) {
if (!streq(lvalue, t->lvalue))
continue;
if (!streq_ptr(section, t->section))
continue;
*func = t->parse;
*ltype = t->ltype;
*data = t->data;
return 1;
}
return 0;
}
int config_item_perf_lookup(
const void *table,
const char *section,
const char *lvalue,
ConfigParserCallback *func,
int *ltype,
void **data,
void *userdata) {
ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
const ConfigPerfItem *p;
assert(table);
assert(lvalue);
assert(func);
assert(ltype);
assert(data);
if (!section)
p = lookup(lvalue, strlen(lvalue));
else {
char *key;
key = strjoin(section, ".", lvalue, NULL);
if (!key)
return -ENOMEM;
p = lookup(key, strlen(key));
free(key);
}
if (!p)
return 0;
*func = p->parse;
*ltype = p->ltype;
*data = (uint8_t*) userdata + p->offset;
return 1;
}
/* Run the user supplied parser for an assignment */
static int next_assignment(const char *unit,
const char *filename,
unsigned line,
ConfigItemLookup lookup,
const void *table,
const char *section,
unsigned section_line,
const char *lvalue,
const char *rvalue,
bool relaxed,
void *userdata) {
ConfigParserCallback func = NULL;
int ltype = 0;
void *data = NULL;
int r;
assert(filename);
assert(line > 0);
assert(lookup);
assert(lvalue);
assert(rvalue);
r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
if (r < 0)
return r;
if (r > 0) {
if (func)
return func(unit, filename, line, section, section_line,
lvalue, ltype, rvalue, data, userdata);
return 0;
}
/* Warn about unknown non-extension fields. */
if (!relaxed && !startswith(lvalue, "X-"))
log_syntax(unit, LOG_WARNING, filename, line, EINVAL,
"Unknown lvalue '%s' in section '%s'", lvalue, section);
return 0;
}
/* Parse a variable assignment line */
static int parse_line(const char* unit,
const char *filename,
unsigned line,
const char *sections,
ConfigItemLookup lookup,
const void *table,
bool relaxed,
bool allow_include,
char **section,
unsigned *section_line,
bool *section_ignored,
char *l,
void *userdata) {
char *e;
assert(filename);
assert(line > 0);
assert(lookup);
assert(l);
l = strstrip(l);
if (!*l)
return 0;
if (strchr(COMMENTS "\n", *l))
return 0;
if (startswith(l, ".include ")) {
_cleanup_free_ char *fn = NULL;
/* .includes are a bad idea, we only support them here
* for historical reasons. They create cyclic include
* problems and make it difficult to detect
* configuration file changes with an easy
* stat(). Better approaches, such as .d/ drop-in
* snippets exist.
*
* Support for them should be eventually removed. */
if (!allow_include) {
log_syntax(unit, LOG_ERR, filename, line, EBADMSG,
".include not allowed here. Ignoring.");
return 0;
}
fn = file_in_same_dir(filename, strstrip(l+9));
if (!fn)
return -ENOMEM;
return config_parse(unit, fn, NULL, sections, lookup, table, relaxed, false, false, userdata);
}
if (*l == '[') {
size_t k;
char *n;
k = strlen(l);
assert(k > 0);
if (l[k-1] != ']') {
log_syntax(unit, LOG_ERR, filename, line, EBADMSG,
"Invalid section header '%s'", l);
return -EBADMSG;
}
n = strndup(l+1, k-2);
if (!n)
return -ENOMEM;
if (sections && !nulstr_contains(sections, n)) {
if (!relaxed && !startswith(n, "X-"))
log_syntax(unit, LOG_WARNING, filename, line, EINVAL,
"Unknown section '%s'. Ignoring.", n);
free(n);
free(*section);
*section = NULL;
*section_line = 0;
*section_ignored = true;
} else {
free(*section);
*section = n;
*section_line = line;
*section_ignored = false;
}
return 0;
}
if (sections && !*section) {
if (!relaxed && !*section_ignored)
log_syntax(unit, LOG_WARNING, filename, line, EINVAL,
"Assignment outside of section. Ignoring.");
return 0;
}
e = strchr(l, '=');
if (!e) {
log_syntax(unit, LOG_WARNING, filename, line, EINVAL, "Missing '='.");
return -EBADMSG;
}
*e = 0;
e++;
return next_assignment(unit,
filename,
line,
lookup,
table,
*section,
*section_line,
strstrip(l),
strstrip(e),
relaxed,
userdata);
}
/* Go through the file and parse each line */
int config_parse(const char *unit,
const char *filename,
FILE *f,
const char *sections,
ConfigItemLookup lookup,
const void *table,
bool relaxed,
bool allow_include,
bool warn,
void *userdata) {
_cleanup_free_ char *section = NULL, *continuation = NULL;
_cleanup_fclose_ FILE *ours = NULL;
unsigned line = 0, section_line = 0;
bool section_ignored = false;
int r;
assert(filename);
assert(lookup);
if (!f) {
f = ours = fopen(filename, "re");
if (!f) {
/* Only log on request, except for ENOENT,
* since we return 0 to the caller. */
if (warn || errno == ENOENT)
log_full(errno == ENOENT ? LOG_DEBUG : LOG_ERR,
"Failed to open configuration file '%s': %m", filename);
return errno == ENOENT ? 0 : -errno;
}
}
fd_warn_permissions(filename, fileno(f));
while (!feof(f)) {
char l[LINE_MAX], *p, *c = NULL, *e;
bool escaped = false;
if (!fgets(l, sizeof(l), f)) {
if (feof(f))
break;
log_error_errno(errno, "Failed to read configuration file '%s': %m", filename);
return -errno;
}
truncate_nl(l);
if (continuation) {
c = strappend(continuation, l);
if (!c) {
if (warn)
log_oom();
return -ENOMEM;
}
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 {
continuation = strdup(l);
if (!continuation) {
if (warn)
log_oom();
return -ENOMEM;
}
}
continue;
}
r = parse_line(unit,
filename,
++line,
sections,
lookup,
table,
relaxed,
allow_include,
&section,
&section_line,
&section_ignored,
p,
userdata);
free(c);
if (r < 0) {
if (warn)
log_warning_errno(r, "Failed to parse file '%s': %m",
filename);
return r;
}
}
return 0;
}
/* Parse each config file in the specified directories. */
int config_parse_many(const char *conf_file,
const char *conf_file_dirs,
const char *sections,
ConfigItemLookup lookup,
const void *table,
bool relaxed,
void *userdata) {
_cleanup_strv_free_ char **files = NULL;
char **fn;
int r;
r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
if (r < 0)
return r;
if (conf_file) {
r = config_parse(NULL, conf_file, NULL, sections, lookup, table, relaxed, false, true, userdata);
if (r < 0)
return r;
}
STRV_FOREACH(fn, files) {
r = config_parse(NULL, *fn, NULL, sections, lookup, table, relaxed, false, true, userdata);
if (r < 0)
return r;
}
return 0;
}
#define DEFINE_PARSER(type, vartype, conv_func) \
int config_parse_##type(const char *unit, \
const char *filename, \
unsigned line, \
const char *section, \
unsigned section_line, \
const char *lvalue, \
int ltype, \
const char *rvalue, \
void *data, \
void *userdata) { \
\
vartype *i = data; \
int r; \
\
assert(filename); \
assert(lvalue); \
assert(rvalue); \
assert(data); \
\
r = conv_func(rvalue, i); \
if (r < 0) \
log_syntax(unit, LOG_ERR, filename, line, -r, \
"Failed to parse %s value, ignoring: %s", \
#vartype, rvalue); \
\
return 0; \
}
DEFINE_PARSER(int, int, safe_atoi)
DEFINE_PARSER(long, long, safe_atoli)
DEFINE_PARSER(uint64, uint64_t, safe_atou64)
DEFINE_PARSER(unsigned, unsigned, safe_atou)
DEFINE_PARSER(double, double, safe_atod)
DEFINE_PARSER(nsec, nsec_t, parse_nsec)
DEFINE_PARSER(sec, usec_t, parse_sec)
int config_parse_iec_size(const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
size_t *sz = data;
off_t o;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = parse_size(rvalue, 1024, &o);
if (r < 0 || (off_t) (size_t) o != o) {
log_syntax(unit, LOG_ERR, filename, line, r < 0 ? -r : ERANGE, "Failed to parse size value, ignoring: %s", rvalue);
return 0;
}
*sz = (size_t) o;
return 0;
}
int config_parse_si_size(const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
size_t *sz = data;
off_t o;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
r = parse_size(rvalue, 1000, &o);
if (r < 0 || (off_t) (size_t) o != o) {
log_syntax(unit, LOG_ERR, filename, line, r < 0 ? -r : ERANGE, "Failed to parse size value, ignoring: %s", rvalue);
return 0;
}
*sz = (size_t) o;
return 0;
}
int config_parse_iec_off(const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
off_t *bytes = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
assert_cc(sizeof(off_t) == sizeof(uint64_t));
r = parse_size(rvalue, 1024, bytes);
if (r < 0)
log_syntax(unit, LOG_ERR, filename, line, -r, "Failed to parse size value, ignoring: %s", rvalue);
return 0;
}
int config_parse_bool(const char* unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
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);
k = parse_boolean(rvalue);
if (k < 0) {
log_syntax(unit, LOG_ERR, filename, line, -k,
"Failed to parse boolean value, ignoring: %s", rvalue);
return 0;
}
*b = !!k;
return 0;
}
int config_parse_string(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char **s = data, *n;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (!utf8_is_valid(rvalue)) {
log_invalid_utf8(unit, LOG_ERR, filename, line, EINVAL, rvalue);
return 0;
}
if (isempty(rvalue))
n = NULL;
else {
n = strdup(rvalue);
if (!n)
return log_oom();
}
free(*s);
*s = n;
return 0;
}
int config_parse_path(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char **s = data, *n;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (!utf8_is_valid(rvalue)) {
log_invalid_utf8(unit, LOG_ERR, filename, line, EINVAL, rvalue);
return 0;
}
if (!path_is_absolute(rvalue)) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Not an absolute path, ignoring: %s", rvalue);
return 0;
}
n = strdup(rvalue);
if (!n)
return log_oom();
path_kill_slashes(n);
free(*s);
*s = n;
return 0;
}
int config_parse_strv(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char ***sv = data;
const char *word, *state;
size_t l;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (isempty(rvalue)) {
char **empty;
/* Empty assignment resets the list. As a special rule
* we actually fill in a real empty array here rather
* than NULL, since some code wants to know if
* something was set at all... */
empty = strv_new(NULL, NULL);
if (!empty)
return log_oom();
strv_free(*sv);
*sv = empty;
return 0;
}
FOREACH_WORD_QUOTED(word, l, rvalue, state) {
char *n;
n = strndup(word, l);
if (!n)
return log_oom();
if (!utf8_is_valid(n)) {
log_invalid_utf8(unit, LOG_ERR, filename, line, EINVAL, rvalue);
free(n);
continue;
}
r = strv_consume(sv, n);
if (r < 0)
return log_oom();
}
if (!isempty(state))
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Trailing garbage, ignoring.");
return 0;
}
int config_parse_mode(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
mode_t *m = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (parse_mode(rvalue, m) < 0) {
log_syntax(unit, LOG_ERR, filename, line, errno, "Failed to parse mode value, ignoring: %s", rvalue);
return 0;
}
return 0;
}
int config_parse_log_facility(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
int *o = data, x;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
x = log_facility_unshifted_from_string(rvalue);
if (x < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Failed to parse log facility, ignoring: %s", rvalue);
return 0;
}
*o = (x << 3) | LOG_PRI(*o);
return 0;
}
int config_parse_log_level(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
int *o = data, x;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
x = log_level_from_string(rvalue);
if (x < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL, "Failed to parse log level, ignoring: %s", rvalue);
return 0;
}
*o = (*o & LOG_FACMASK) | x;
return 0;
}
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