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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "af-list.h"
#include "extract-word.h"
#include "ip-protocol-list.h"
#include "log.h"
#include "mountpoint-util.h"
#include "parse-helpers.h"
#include "parse-util.h"
#include "path-util.h"
#include "utf8.h"
static bool validate_api_vfs(const char *path, PathSimplifyWarnFlags flags) {
assert(path);
if ((flags & (PATH_CHECK_NON_API_VFS|PATH_CHECK_NON_API_VFS_DEV_OK)) == 0)
return true;
if (!path_below_api_vfs(path))
return true;
if (FLAGS_SET(flags, PATH_CHECK_NON_API_VFS_DEV_OK) && path_startswith(path, "/dev"))
return true;
return false;
}
int path_simplify_and_warn(
char *path,
PathSimplifyWarnFlags flags,
const char *unit,
const char *filename,
unsigned line,
const char *lvalue) {
bool fatal = flags & PATH_CHECK_FATAL;
int level = fatal ? LOG_ERR : LOG_WARNING;
assert(path);
assert(!FLAGS_SET(flags, PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE));
assert(!FLAGS_SET(flags, PATH_CHECK_NON_API_VFS | PATH_CHECK_NON_API_VFS_DEV_OK));
assert(lvalue);
if (!utf8_is_valid(path))
return log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, path);
if (flags & (PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)) {
bool absolute;
absolute = path_is_absolute(path);
if (!absolute && (flags & PATH_CHECK_ABSOLUTE))
return log_syntax(unit, level, filename, line, SYNTHETIC_ERRNO(EINVAL),
"%s= path is not absolute%s: %s",
lvalue, fatal ? "" : ", ignoring", path);
if (absolute && (flags & PATH_CHECK_RELATIVE))
return log_syntax(unit, level, filename, line, SYNTHETIC_ERRNO(EINVAL),
"%s= path is absolute%s: %s",
lvalue, fatal ? "" : ", ignoring", path);
}
path_simplify_full(path, flags & PATH_KEEP_TRAILING_SLASH ? PATH_SIMPLIFY_KEEP_TRAILING_SLASH : 0);
if (!path_is_valid(path))
return log_syntax(unit, level, filename, line, SYNTHETIC_ERRNO(EINVAL),
"%s= path has invalid length (%zu bytes)%s.",
lvalue, strlen(path), fatal ? "" : ", ignoring");
if (!path_is_normalized(path))
return log_syntax(unit, level, filename, line, SYNTHETIC_ERRNO(EINVAL),
"%s= path is not normalized%s: %s",
lvalue, fatal ? "" : ", ignoring", path);
if (!validate_api_vfs(path, flags))
return log_syntax(unit, level, filename, line, SYNTHETIC_ERRNO(EINVAL),
"%s= path is below API VFS%s: %s",
lvalue, fatal ? ", refusing" : ", ignoring",
path);
return 0;
}
static int parse_af_token(
const char *token,
int *family,
int *ip_protocol,
uint16_t *nr_ports,
uint16_t *port_min) {
int af;
assert(token);
assert(family);
af = af_from_ipv4_ipv6(token);
if (af == AF_UNSPEC)
return -EINVAL;
*family = af;
return 0;
}
static int parse_ip_protocol_token(
const char *token,
int *family,
int *ip_protocol,
uint16_t *nr_ports,
uint16_t *port_min) {
int proto;
assert(token);
assert(ip_protocol);
proto = ip_protocol_from_tcp_udp(token);
if (proto < 0)
return -EINVAL;
*ip_protocol = proto;
return 0;
}
static int parse_ip_ports_token(
const char *token,
int *family,
int *ip_protocol,
uint16_t *nr_ports,
uint16_t *port_min) {
int r;
assert(token);
assert(nr_ports);
assert(port_min);
if (streq(token, "any"))
*nr_ports = *port_min = 0;
else {
uint16_t mn = 0, mx = 0;
r = parse_ip_port_range(token, &mn, &mx, /* allow_zero = */ true);
if (r < 0)
return r;
*nr_ports = mx - mn + 1;
*port_min = mn;
}
return 0;
}
typedef int (*parse_token_f)(
const char *,
int *,
int *,
uint16_t *,
uint16_t *);
int parse_socket_bind_item(
const char *str,
int *address_family,
int *ip_protocol,
uint16_t *nr_ports,
uint16_t *port_min) {
/* Order of token parsers is important. */
const parse_token_f parsers[] = {
&parse_af_token,
&parse_ip_protocol_token,
&parse_ip_ports_token,
};
parse_token_f const *parser_ptr = parsers;
int af = AF_UNSPEC, proto = 0, r;
uint16_t nr = 0, mn = 0;
const char *p = ASSERT_PTR(str);
assert(address_family);
assert(ip_protocol);
assert(nr_ports);
assert(port_min);
if (isempty(p))
return -EINVAL;
for (;;) {
_cleanup_free_ char *token = NULL;
r = extract_first_word(&p, &token, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
if (r == 0)
break;
if (r < 0)
return r;
if (isempty(token))
return -EINVAL;
while (parser_ptr != parsers + ELEMENTSOF(parsers)) {
r = (*parser_ptr)(token, &af, &proto, &nr, &mn);
if (r == -ENOMEM)
return r;
++parser_ptr;
/* Continue to next token if parsing succeeded,
* otherwise apply next parser to the same token.
*/
if (r >= 0)
break;
}
if (parser_ptr == parsers + ELEMENTSOF(parsers))
break;
}
/* Failed to parse a token. */
if (r < 0)
return r;
/* Parsers applied successfully, but end of the string not reached. */
if (p)
return -EINVAL;
*address_family = af;
*ip_protocol = proto;
*nr_ports = nr;
*port_min = mn;
return 0;
}
int config_parse_path_or_ignore(
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) {
_cleanup_free_ char *n = NULL;
bool fatal = ltype;
char **s = ASSERT_PTR(data);
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue))
goto finalize;
n = strdup(rvalue);
if (!n)
return log_oom();
if (streq(n, "-"))
goto finalize;
r = path_simplify_and_warn(n, PATH_CHECK_ABSOLUTE | (fatal ? PATH_CHECK_FATAL : 0), unit, filename, line, lvalue);
if (r < 0)
return fatal ? -ENOEXEC : 0;
finalize:
return free_and_replace(*s, n);
}
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