Systemd/src/shared/conf-parser.c
Michal Schmidt f3910003bc shared, libsystemd-daemon: check for empty strings in strto*l conversions
strtol() and friends may set EINVAL if no conversion was performed, but
they are not required to do so. In practice they don't. We need to check
for it.

https://bugzilla.redhat.com/show_bug.cgi?id=870577
2012-10-30 10:30:04 +01:00

1008 lines
26 KiB
C

/*-*- 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 <assert.h>
#include <stdlib.h>
#include "conf-parser.h"
#include "util.h"
#include "macro.h"
#include "strv.h"
#include "log.h"
#include "utf8.h"
#include "path-util.h"
#include "set.h"
#include "exit-status.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 = 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 *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) {
if (!relaxed)
log_info("[%s:%u] Assignment outside of section. Ignoring.", filename, line);
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);
n = strdup(rvalue);
if (!n)
return -ENOMEM;
if (!utf8_is_valid(n)) {
log_error("[%s:%u] String is not UTF-8 clean, ignoring assignment: %s", filename, line, rvalue);
free(n);
return 0;
}
free(*s);
if (*n)
*s = n;
else {
free(n);
*s = NULL;
}
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 (!utf8_is_valid(rvalue)) {
log_error("[%s:%u] Path is not UTF-8 clean, ignoring assignment: %s", filename, line, rvalue);
return 0;
}
if (!path_is_absolute(rvalue)) {
log_error("[%s:%u] Not an absolute path, ignoring: %s", filename, line, rvalue);
return 0;
}
n = strdup(rvalue);
if (!n)
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;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
k = strv_length(*sv);
FOREACH_WORD_QUOTED(w, l, rvalue, state)
k++;
n = new(char*, k+1);
if (!n)
return -ENOMEM;
if (*sv)
for (k = 0; (*sv)[k]; k++)
n[k] = (*sv)[k];
else
k = 0;
FOREACH_WORD_QUOTED(w, l, rvalue, state) {
n[k] = cunescape_length(w, l);
if (!n[k]) {
r = -ENOMEM;
goto fail;
}
if (!utf8_is_valid(n[k])) {
log_error("[%s:%u] String is not UTF-8 clean, ignoring assignment: %s", filename, line, rvalue);
free(n[k]);
continue;
}
k++;
}
n[k] = NULL;
free(*sv);
*sv = n;
return 0;
fail:
for (; k > 0; k--)
free(n[k-1]);
free(n);
return r;
}
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++;
n = new(char*, k+1);
if (!n)
return -ENOMEM;
k = 0;
if (*sv)
for (; (*sv)[k]; k++)
n[k] = (*sv)[k];
FOREACH_WORD_QUOTED(w, l, rvalue, state) {
n[k] = strndup(w, l);
if (!n[k]) {
r = -ENOMEM;
goto fail;
}
if (!utf8_is_valid(n[k])) {
log_error("[%s:%u] Path is not UTF-8 clean, ignoring assignment: %s", filename, line, rvalue);
free(n[k]);
continue;
}
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:
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_nsec(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
nsec_t *nsec = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (parse_nsec(rvalue, nsec) < 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 == rvalue || *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;
}
int config_parse_facility(
const char *filename,
unsigned line,
const char *section,
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_error("[%s:%u] Failed to parse log facility, ignoring: %s", filename, line, rvalue);
return 0;
}
*o = (x << 3) | LOG_PRI(*o);
return 0;
}
int config_parse_level(
const char *filename,
unsigned line,
const char *section,
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_error("[%s:%u] Failed to parse log level, ignoring: %s", filename, line, rvalue);
return 0;
}
*o = (*o & LOG_FACMASK) | x;
return 0;
}
int config_parse_set_status(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char *w;
size_t l;
char *state;
int r;
ExitStatusSet *status_set = data;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
FOREACH_WORD(w, l, rvalue, state) {
int val;
char *temp;
temp = strndup(w, l);
if (!temp)
return log_oom();
r = safe_atoi(temp, &val);
if (r < 0) {
val = signal_from_string_try_harder(temp);
free(temp);
if (val > 0) {
r = set_ensure_allocated(&status_set->signal, trivial_hash_func, trivial_compare_func);
if (r < 0)
return log_oom();
r = set_put(status_set->signal, INT_TO_PTR(val));
if (r < 0) {
log_error("[%s:%u] Unable to store: %s", filename, line, w);
return r;
}
} else {
log_error("[%s:%u] Failed to parse value, ignoring: %s", filename, line, w);
return 0;
}
} else {
free(temp);
if (val < 0 || val > 255)
log_warning("[%s:%u] Value %d is outside range 0-255, ignoring", filename, line, val);
else {
r = set_ensure_allocated(&status_set->code, trivial_hash_func, trivial_compare_func);
if (r < 0)
return log_oom();
r = set_put(status_set->code, INT_TO_PTR(val));
if (r < 0) {
log_error("[%s:%u] Unable to store: %s", filename, line, w);
return r;
}
}
}
}
return 0;
}