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src.rivoreo.one / systemd-stable / v41 / . / src / 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 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"
int config_item_table_lookup(
void *table,
const char *section,
const char *lvalue,
ConfigParserCallback *func,
int *ltype,
void **data,
void *userdata) {
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(
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 = join(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 *filename,
unsigned line,
ConfigItemLookup lookup,
void *table,
const char *section,
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(filename, line, section, lvalue, ltype, rvalue, data, userdata);
return 0;
}
/* 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, section);
return 0;
}
/* Parse a variable assignment line */
static int parse_line(
const char *filename,
unsigned line,
const char *sections,
ConfigItemLookup lookup,
void *table,
bool relaxed,
char **section,
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, *l))
return 0;
if (startswith(l, ".include ")) {
char *fn;
int r;
fn = file_in_same_dir(filename, strstrip(l+9));
if (!fn)
return -ENOMEM;
r = config_parse(fn, NULL, sections, lookup, table, 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;
}
n = strndup(l+1, k-2);
if (!n)
return -ENOMEM;
if (sections && !nulstr_contains(sections, n)) {
if (!relaxed)
log_info("[%s:%u] Unknown section '%s'. Ignoring.", filename, line, n);
free(n);
*section = NULL;
} else {
free(*section);
*section = n;
}
return 0;
}
if (sections && !*section)
return 0;
e = strchr(l, '=');
if (!e) {
log_error("[%s:%u] Missing '='.", filename, line);
return -EBADMSG;
}
*e = 0;
e++;
return next_assignment(
filename,
line,
lookup,
table,
*section,
strstrip(l),
strstrip(e),
relaxed,
userdata);
}
/* Go through the file and parse each line */
int config_parse(
const char *filename,
FILE *f,
const char *sections,
ConfigItemLookup lookup,
void *table,
bool relaxed,
void *userdata) {
unsigned line = 0;
char *section = NULL;
int r;
bool ours = false;
char *continuation = NULL;
assert(filename);
assert(lookup);
if (!f) {
f = fopen(filename, "re");
if (!f) {
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) {
c = strappend(continuation, l);
if (!c) {
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 {
continuation = strdup(l);
if (!continuation) {
r = -ENOMEM;
goto finish;
}
}
continue;
}
r = parse_line(filename,
++line,
sections,
lookup,
table,
relaxed,
&section,
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, ingoring: %s", filename, line, rvalue);
return 0;
}
return 0;
}
int config_parse_long(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
long *i = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if ((r = safe_atoli(rvalue, i)) < 0) {
log_error("[%s:%u] Failed to parse numeric value, ignoring: %s", filename, line, rvalue);
return 0;
}
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, ignoring: %s", filename, line, rvalue);
return 0;
}
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_bytes_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;
off_t o;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (parse_bytes(rvalue, &o) < 0 || (off_t) (size_t) o != o) {
log_error("[%s:%u] Failed to parse byte value, ignoring: %s", filename, line, rvalue);
return 0;
}
*sz = (size_t) o;
return 0;
}
int config_parse_bytes_off(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
off_t *bytes = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
assert_cc(sizeof(off_t) == sizeof(uint64_t));
if (parse_bytes(rvalue, bytes) < 0) {
log_error("[%s:%u] Failed to parse bytes value, ignoring: %s", filename, line, rvalue);
return 0;
}
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, ignoring: %s", filename, line, rvalue);
return 0;
}
*b = !!k;
return 0;
}
int config_parse_tristate(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
int k;
int *b = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
/* Tristates are like booleans, but can also take the 'default' value, i.e. "-1" */
k = parse_boolean(rvalue);
if (k < 0) {
log_error("[%s:%u] Failed to parse boolean value, ignoring: %s", filename, line, rvalue);
return 0;
}
*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, ignoring: %s", filename, line, rvalue);
return 0;
}
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, ignoring: %s", filename, line, rvalue);
free(n[k]);
continue;
}
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;
}
int config_parse_usec(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
usec_t *usec = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (parse_usec(rvalue, usec) < 0) {
log_error("[%s:%u] Failed to parse time value, ignoring: %s", filename, line, rvalue);
return 0;
}
return 0;
}
int config_parse_mode(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
mode_t *m = data;
long l;
char *x = NULL;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
errno = 0;
l = strtol(rvalue, &x, 8);
if (!x || *x || errno) {
log_error("[%s:%u] Failed to parse mode value, ignoring: %s", filename, line, rvalue);
return 0;
}
if (l < 0000 || l > 07777) {
log_error("[%s:%u] mode value out of range, ignoring: %s", filename, line, rvalue);
return 0;
}
*m = (mode_t) l;
return 0;
}