diff options
Diffstat (limited to 'src/shared/parse-helpers.c')
| -rw-r--r-- | src/shared/parse-helpers.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/shared/parse-helpers.c b/src/shared/parse-helpers.c new file mode 100644 index 0000000..9664b9c --- /dev/null +++ b/src/shared/parse-helpers.c @@ -0,0 +1,237 @@ +/* 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 "parse-helpers.h" +#include "parse-util.h" +#include "path-util.h" +#include "utf8.h" + +int path_simplify_and_warn( + char *path, + unsigned flag, + const char *unit, + const char *filename, + unsigned line, + const char *lvalue) { + + bool fatal = flag & PATH_CHECK_FATAL; + + assert(!FLAGS_SET(flag, PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)); + + if (!utf8_is_valid(path)) + return log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, path); + + if (flag & (PATH_CHECK_ABSOLUTE | PATH_CHECK_RELATIVE)) { + bool absolute; + + absolute = path_is_absolute(path); + + if (!absolute && (flag & PATH_CHECK_ABSOLUTE)) + return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), + "%s= path is not absolute%s: %s", + lvalue, fatal ? "" : ", ignoring", path); + + if (absolute && (flag & PATH_CHECK_RELATIVE)) + return log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), + "%s= path is absolute%s: %s", + lvalue, fatal ? "" : ", ignoring", path); + } + + path_simplify_full(path, flag & PATH_KEEP_TRAILING_SLASH ? PATH_SIMPLIFY_KEEP_TRAILING_SLASH : 0); + + if (!path_is_valid(path)) + return log_syntax(unit, LOG_ERR, 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, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL), + "%s= path is not normalized%s: %s", + lvalue, fatal ? "" : ", 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) { + + assert(token); + assert(nr_ports); + assert(port_min); + + if (streq(token, "any")) + *nr_ports = *port_min = 0; + else { + uint16_t mn = 0, mx = 0; + int r = parse_ip_port_range(token, &mn, &mx); + 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); +} |