diff options
Diffstat (limited to 'src/basic/in-addr-util.h')
| -rw-r--r-- | src/basic/in-addr-util.h | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h new file mode 100644 index 0000000..19fa35f --- /dev/null +++ b/src/basic/in-addr-util.h @@ -0,0 +1,193 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +#pragma once + +#include <arpa/inet.h> +#include <netinet/in.h> +#include <stddef.h> +#include <sys/socket.h> + +#include "hash-funcs.h" +#include "macro.h" +#include "util.h" + +union in_addr_union { + struct in_addr in; + struct in6_addr in6; + uint8_t bytes[CONST_MAX(sizeof(struct in_addr), sizeof(struct in6_addr))]; +}; + +struct in_addr_data { + int family; + union in_addr_union address; +}; + +bool in4_addr_is_null(const struct in_addr *a); +static inline bool in4_addr_is_set(const struct in_addr *a) { + return !in4_addr_is_null(a); +} +bool in6_addr_is_null(const struct in6_addr *a); +static inline bool in6_addr_is_set(const struct in6_addr *a) { + return !in6_addr_is_null(a); +} +int in_addr_is_null(int family, const union in_addr_union *u); +static inline bool in_addr_is_set(int family, const union in_addr_union *u) { + return in_addr_is_null(family, u) == 0; +} +static inline int in_addr_data_is_null(const struct in_addr_data *a) { + assert(a); + return in_addr_is_null(a->family, &a->address); +} +static inline bool in_addr_data_is_set(const struct in_addr_data *a) { + return in_addr_data_is_null(a); +} + +int in_addr_is_multicast(int family, const union in_addr_union *u); + +bool in4_addr_is_link_local(const struct in_addr *a); +bool in4_addr_is_link_local_dynamic(const struct in_addr *a); +bool in6_addr_is_link_local(const struct in6_addr *a); +int in_addr_is_link_local(int family, const union in_addr_union *u); +bool in6_addr_is_link_local_all_nodes(const struct in6_addr *a); + +bool in4_addr_is_localhost(const struct in_addr *a); +int in_addr_is_localhost(int family, const union in_addr_union *u); +int in_addr_is_localhost_one(int family, const union in_addr_union *u); + +bool in4_addr_is_local_multicast(const struct in_addr *a); +bool in4_addr_is_non_local(const struct in_addr *a); +bool in6_addr_is_ipv4_mapped_address(const struct in6_addr *a); + +bool in4_addr_equal(const struct in_addr *a, const struct in_addr *b); +bool in6_addr_equal(const struct in6_addr *a, const struct in6_addr *b); +int in_addr_equal(int family, const union in_addr_union *a, const union in_addr_union *b); +int in_addr_prefix_intersect(int family, const union in_addr_union *a, unsigned aprefixlen, const union in_addr_union *b, unsigned bprefixlen); +int in_addr_prefix_next(int family, union in_addr_union *u, unsigned prefixlen); +int in_addr_prefix_nth(int family, union in_addr_union *u, unsigned prefixlen, uint64_t nth); +int in_addr_random_prefix(int family, union in_addr_union *u, unsigned prefixlen_fixed_part, unsigned prefixlen); +int in_addr_prefix_range( + int family, + const union in_addr_union *in, + unsigned prefixlen, + union in_addr_union *ret_start, + union in_addr_union *ret_end); + +int in_addr_to_string(int family, const union in_addr_union *u, char **ret); +static inline int in6_addr_to_string(const struct in6_addr *u, char **ret) { + return in_addr_to_string(AF_INET6, (const union in_addr_union*) u, ret); +} + +static inline const char* typesafe_inet_ntop(int family, const union in_addr_union *a, char *buf, size_t len) { + return inet_ntop(family, a, buf, len); +} +static inline const char* typesafe_inet_ntop4(const struct in_addr *a, char *buf, size_t len) { + return inet_ntop(AF_INET, a, buf, len); +} +static inline const char* typesafe_inet_ntop6(const struct in6_addr *a, char *buf, size_t len) { + return inet_ntop(AF_INET6, a, buf, len); +} + +/* Note: the lifetime of the compound literal is the immediately surrounding block, + * see C11 ยง6.5.2.5, and + * https://stackoverflow.com/questions/34880638/compound-literal-lifetime-and-if-blocks */ +#define IN_ADDR_MAX CONST_MAX(INET_ADDRSTRLEN, INET6_ADDRSTRLEN) +#define IN_ADDR_TO_STRING(family, addr) typesafe_inet_ntop(family, addr, (char[IN_ADDR_MAX]){}, IN_ADDR_MAX) +#define IN4_ADDR_TO_STRING(addr) typesafe_inet_ntop4(addr, (char[INET_ADDRSTRLEN]){}, INET_ADDRSTRLEN) +#define IN6_ADDR_TO_STRING(addr) typesafe_inet_ntop6(addr, (char[INET6_ADDRSTRLEN]){}, INET6_ADDRSTRLEN) + +int in_addr_prefix_to_string( + int family, + const union in_addr_union *u, + unsigned prefixlen, + char *buf, + size_t buf_len); + +static inline const char* _in_addr_prefix_to_string( + int family, + const union in_addr_union *u, + unsigned prefixlen, + char *buf, + size_t buf_len) { + /* We assume that this is called with an appropriately sized buffer and can never fail. */ + assert_se(in_addr_prefix_to_string(family, u, prefixlen, buf, buf_len) == 0); + return buf; +} +static inline const char* _in4_addr_prefix_to_string(const struct in_addr *a, unsigned prefixlen, char *buf, size_t buf_len) { + return _in_addr_prefix_to_string(AF_INET, (const union in_addr_union *) a, prefixlen, buf, buf_len); +} +static inline const char* _in6_addr_prefix_to_string(const struct in6_addr *a, unsigned prefixlen, char *buf, size_t buf_len) { + return _in_addr_prefix_to_string(AF_INET6, (const union in_addr_union *) a, prefixlen, buf, buf_len); +} + +#define PREFIX_SUFFIX_MAX (1 + DECIMAL_STR_MAX(unsigned)) +#define IN_ADDR_PREFIX_TO_STRING(family, addr, prefixlen) \ + _in_addr_prefix_to_string(family, addr, prefixlen, (char[IN_ADDR_MAX + PREFIX_SUFFIX_MAX]){}, IN_ADDR_MAX + PREFIX_SUFFIX_MAX) +#define IN4_ADDR_PREFIX_TO_STRING(addr, prefixlen) \ + _in4_addr_prefix_to_string(addr, prefixlen, (char[INET_ADDRSTRLEN + PREFIX_SUFFIX_MAX]){}, INET_ADDRSTRLEN + PREFIX_SUFFIX_MAX) +#define IN6_ADDR_PREFIX_TO_STRING(addr, prefixlen) \ + _in6_addr_prefix_to_string(addr, prefixlen, (char[INET6_ADDRSTRLEN + PREFIX_SUFFIX_MAX]){}, INET6_ADDRSTRLEN + PREFIX_SUFFIX_MAX) + +int in_addr_port_ifindex_name_to_string(int family, const union in_addr_union *u, uint16_t port, int ifindex, const char *server_name, char **ret); +static inline int in_addr_ifindex_to_string(int family, const union in_addr_union *u, int ifindex, char **ret) { + return in_addr_port_ifindex_name_to_string(family, u, 0, ifindex, NULL, ret); +} +static inline int in_addr_port_to_string(int family, const union in_addr_union *u, uint16_t port, char **ret) { + return in_addr_port_ifindex_name_to_string(family, u, port, 0, NULL, ret); +} +int in_addr_from_string(int family, const char *s, union in_addr_union *ret); +int in_addr_from_string_auto(const char *s, int *ret_family, union in_addr_union *ret); + +unsigned char in4_addr_netmask_to_prefixlen(const struct in_addr *addr); +struct in_addr* in4_addr_prefixlen_to_netmask(struct in_addr *addr, unsigned char prefixlen); +struct in6_addr* in6_addr_prefixlen_to_netmask(struct in6_addr *addr, unsigned char prefixlen); +int in_addr_prefixlen_to_netmask(int family, union in_addr_union *addr, unsigned char prefixlen); +int in4_addr_default_prefixlen(const struct in_addr *addr, unsigned char *prefixlen); +int in4_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mask); +int in4_addr_mask(struct in_addr *addr, unsigned char prefixlen); +int in6_addr_mask(struct in6_addr *addr, unsigned char prefixlen); +int in_addr_mask(int family, union in_addr_union *addr, unsigned char prefixlen); +int in4_addr_prefix_covers(const struct in_addr *prefix, unsigned char prefixlen, const struct in_addr *address); +int in6_addr_prefix_covers(const struct in6_addr *prefix, unsigned char prefixlen, const struct in6_addr *address); +int in_addr_prefix_covers(int family, const union in_addr_union *prefix, unsigned char prefixlen, const union in_addr_union *address); +int in_addr_parse_prefixlen(int family, const char *p, unsigned char *ret); +int in_addr_prefix_from_string(const char *p, int family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen); + +typedef enum InAddrPrefixLenMode { + PREFIXLEN_FULL, /* Default to prefixlen of address size, 32 for IPv4 or 128 for IPv6, if not specified. */ + PREFIXLEN_REFUSE, /* Fail with -ENOANO if prefixlen is not specified. */ + PREFIXLEN_LEGACY, /* Default to legacy default prefixlen calculation from address if not specified. */ +} InAddrPrefixLenMode; + +int in_addr_prefix_from_string_auto_internal(const char *p, InAddrPrefixLenMode mode, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen); +static inline int in_addr_prefix_from_string_auto(const char *p, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen) { + return in_addr_prefix_from_string_auto_internal(p, PREFIXLEN_FULL, ret_family, ret_prefix, ret_prefixlen); +} + +static inline size_t FAMILY_ADDRESS_SIZE(int family) { + assert(IN_SET(family, AF_INET, AF_INET6)); + return family == AF_INET6 ? 16 : 4; +} + +#define FAMILY_ADDRESS_SIZE_SAFE(f) \ + ({ \ + int _f = (f); \ + _f == AF_INET ? sizeof(struct in_addr) : \ + _f == AF_INET6 ? sizeof(struct in6_addr) : 0; \ + }) + +/* Workaround for clang, explicitly specify the maximum-size element here. + * See also oss-fuzz#11344. */ +#define IN_ADDR_NULL ((union in_addr_union) { .in6 = {} }) + +void in6_addr_hash_func(const struct in6_addr *addr, struct siphash *state); +int in6_addr_compare_func(const struct in6_addr *a, const struct in6_addr *b); + +extern const struct hash_ops in_addr_data_hash_ops; +extern const struct hash_ops in6_addr_hash_ops; +extern const struct hash_ops in6_addr_hash_ops_free; + +#define IPV4_ADDRESS_FMT_STR "%u.%u.%u.%u" +#define IPV4_ADDRESS_FMT_VAL(address) \ + be32toh((address).s_addr) >> 24, \ + (be32toh((address).s_addr) >> 16) & 0xFFu, \ + (be32toh((address).s_addr) >> 8) & 0xFFu, \ + be32toh((address).s_addr) & 0xFFu |