/* Copyright (c) 2003-2004, Roger Dingledine * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. * Copyright (c) 2007-2012, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** * \file address.h * \brief Headers for address.h **/ #ifndef _TOR_ADDRESS_H #define _TOR_ADDRESS_H #include "orconfig.h" #include "torint.h" #include "compat.h" /** The number of bits from an address to consider while doing a masked * comparison. */ typedef uint8_t maskbits_t; struct in_addr; /** Holds an IPv4 or IPv6 address. (Uses less memory than struct * sockaddr_storage.) */ typedef struct tor_addr_t { sa_family_t family; union { struct in_addr in_addr; struct in6_addr in6_addr; } addr; } tor_addr_t; /** Holds an IP address and a TCP/UDP port. */ typedef struct tor_addr_port_t { tor_addr_t addr; uint16_t port; } tor_addr_port_t; #define TOR_ADDR_NULL {AF_UNSPEC, {{0}}}; static INLINE const struct in6_addr *tor_addr_to_in6(const tor_addr_t *a); static INLINE uint32_t tor_addr_to_ipv4n(const tor_addr_t *a); static INLINE uint32_t tor_addr_to_ipv4h(const tor_addr_t *a); static INLINE uint32_t tor_addr_to_mapped_ipv4h(const tor_addr_t *a); static INLINE sa_family_t tor_addr_family(const tor_addr_t *a); static INLINE const struct in_addr *tor_addr_to_in(const tor_addr_t *a); static INLINE int tor_addr_eq_ipv4h(const tor_addr_t *a, uint32_t u); socklen_t tor_addr_to_sockaddr(const tor_addr_t *a, uint16_t port, struct sockaddr *sa_out, socklen_t len); int tor_addr_from_sockaddr(tor_addr_t *a, const struct sockaddr *sa, uint16_t *port_out); void tor_addr_make_unspec(tor_addr_t *a); char *tor_sockaddr_to_str(const struct sockaddr *sa); /** Return an in6_addr* equivalent to a, or NULL if a is not * an IPv6 address. */ static INLINE const struct in6_addr * tor_addr_to_in6(const tor_addr_t *a) { return a->family == AF_INET6 ? &a->addr.in6_addr : NULL; } /** Given an IPv6 address x, yield it as an array of uint8_t. * * Requires that x is actually an IPv6 address. */ #define tor_addr_to_in6_addr8(x) tor_addr_to_in6(x)->s6_addr /** Given an IPv6 address x, yield it as an array of uint16_t. * * Requires that x is actually an IPv6 address. */ #define tor_addr_to_in6_addr16(x) S6_ADDR16(*tor_addr_to_in6(x)) /** Given an IPv6 address x, yield it as an array of uint32_t. * * Requires that x is actually an IPv6 address. */ #define tor_addr_to_in6_addr32(x) S6_ADDR32(*tor_addr_to_in6(x)) /** Return an IPv4 address in network order for a, or 0 if * a is not an IPv4 address. */ static INLINE uint32_t tor_addr_to_ipv4n(const tor_addr_t *a) { return a->family == AF_INET ? a->addr.in_addr.s_addr : 0; } /** Return an IPv4 address in host order for a, or 0 if * a is not an IPv4 address. */ static INLINE uint32_t tor_addr_to_ipv4h(const tor_addr_t *a) { return ntohl(tor_addr_to_ipv4n(a)); } /** Given an IPv6 address, return its mapped IPv4 address in host order, or * 0 if a is not an IPv6 address. * * (Does not check whether the address is really a mapped address */ static INLINE uint32_t tor_addr_to_mapped_ipv4h(const tor_addr_t *a) { return a->family == AF_INET6 ? ntohl(tor_addr_to_in6_addr32(a)[3]) : 0; } /** Return the address family of a. Possible values are: * AF_INET6, AF_INET, AF_UNSPEC. */ static INLINE sa_family_t tor_addr_family(const tor_addr_t *a) { return a->family; } /** Return an in_addr* equivalent to a, or NULL if a is not * an IPv4 address. */ static INLINE const struct in_addr * tor_addr_to_in(const tor_addr_t *a) { return a->family == AF_INET ? &a->addr.in_addr : NULL; } /** Return true iff a is an IPv4 address equal to the host-ordered * address in u. */ static INLINE int tor_addr_eq_ipv4h(const tor_addr_t *a, uint32_t u) { return a->family == AF_INET ? (tor_addr_to_ipv4h(a) == u) : 0; } /** Length of a buffer that you need to allocate to be sure you can encode * any tor_addr_t. * * This allows enough space for * "[ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255]", * plus a terminating NUL. */ #define TOR_ADDR_BUF_LEN 48 int tor_addr_lookup(const char *name, uint16_t family, tor_addr_t *addr_out); char *tor_dup_addr(const tor_addr_t *addr) ATTR_MALLOC; /** Wrapper function of fmt_addr_impl(). It does not decorate IPv6 * addresses. */ #define fmt_addr(a) fmt_addr_impl((a), 0) /** Wrapper function of fmt_addr_impl(). It decorates IPv6 * addresses. */ #define fmt_and_decorate_addr(a) fmt_addr_impl((a), 1) const char *fmt_addr_impl(const tor_addr_t *addr, int decorate); const char * fmt_addr32(uint32_t addr); int get_interface_address6(int severity, sa_family_t family, tor_addr_t *addr); /** Flag to specify how to do a comparison between addresses. In an "exact" * comparison, addresses are equivalent only if they are in the same family * with the same value. In a "semantic" comparison, IPv4 addresses match all * IPv6 encodings of those addresses. */ typedef enum { CMP_EXACT, CMP_SEMANTIC, } tor_addr_comparison_t; int tor_addr_compare(const tor_addr_t *addr1, const tor_addr_t *addr2, tor_addr_comparison_t how); int tor_addr_compare_masked(const tor_addr_t *addr1, const tor_addr_t *addr2, maskbits_t mask, tor_addr_comparison_t how); /** Return true iff a and b are the same address. The comparison is done * "exactly". */ #define tor_addr_eq(a,b) (0==tor_addr_compare((a),(b),CMP_EXACT)) unsigned int tor_addr_hash(const tor_addr_t *addr); int tor_addr_is_v4(const tor_addr_t *addr); int tor_addr_is_internal(const tor_addr_t *ip, int for_listening); /** Longest length that can be required for a reverse lookup name. */ /* 32 nybbles, 32 dots, 8 characters of "ip6.arpa", 1 NUL: 73 characters. */ #define REVERSE_LOOKUP_NAME_BUF_LEN 73 int tor_addr_to_PTR_name(char *out, size_t outlen, const tor_addr_t *addr); int tor_addr_parse_PTR_name(tor_addr_t *result, const char *address, int family, int accept_regular); int tor_addr_port_lookup(const char *s, tor_addr_t *addr_out, uint16_t *port_out); int tor_addr_parse_mask_ports(const char *s, tor_addr_t *addr_out, maskbits_t *mask_out, uint16_t *port_min_out, uint16_t *port_max_out); const char * tor_addr_to_str(char *dest, const tor_addr_t *addr, size_t len, int decorate); int tor_addr_parse(tor_addr_t *addr, const char *src); void tor_addr_copy(tor_addr_t *dest, const tor_addr_t *src); void tor_addr_from_ipv4n(tor_addr_t *dest, uint32_t v4addr); /** Set dest to the IPv4 address encoded in v4addr in host * order. */ #define tor_addr_from_ipv4h(dest, v4addr) \ tor_addr_from_ipv4n((dest), htonl(v4addr)) void tor_addr_from_ipv6_bytes(tor_addr_t *dest, const char *bytes); /** Set dest to the IPv4 address incoded in in. */ #define tor_addr_from_in(dest, in) \ tor_addr_from_ipv4n((dest), (in)->s_addr); void tor_addr_from_in6(tor_addr_t *dest, const struct in6_addr *in6); int tor_addr_is_null(const tor_addr_t *addr); int tor_addr_is_loopback(const tor_addr_t *addr); int tor_addr_port_split(int severity, const char *addrport, char **address_out, uint16_t *port_out); int tor_addr_hostname_is_local(const char *name); /* IPv4 helpers */ int is_internal_IP(uint32_t ip, int for_listening); int addr_port_lookup(int severity, const char *addrport, char **address, uint32_t *addr, uint16_t *port_out); int parse_port_range(const char *port, uint16_t *port_min_out, uint16_t *port_max_out); int parse_addr_and_port_range(const char *s, uint32_t *addr_out, maskbits_t *maskbits_out, uint16_t *port_min_out, uint16_t *port_max_out); int addr_mask_get_bits(uint32_t mask); int addr_mask_cmp_bits(uint32_t a1, uint32_t a2, maskbits_t bits); /** Length of a buffer to allocate to hold the results of tor_inet_ntoa.*/ #define INET_NTOA_BUF_LEN 16 int tor_inet_ntoa(const struct in_addr *in, char *buf, size_t buf_len); char *tor_dup_ip(uint32_t addr) ATTR_MALLOC; int get_interface_address(int severity, uint32_t *addr); #endif