#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"

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;

}

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;

}

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);

}

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 = cunescape(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 || 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;

}