5 This file is part of catta.
7 catta is free software; you can redistribute it and/or modify it
8 under the terms of the GNU Lesser General Public License as
9 published by the Free Software Foundation; either version 2.1 of the
10 License, or (at your option) any later version.
12 catta is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
15 Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with catta; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
23 /** \file address.h Definitions and functions to manipulate IP addresses. */
26 #include <sys/types.h>
28 #include <catta/cdecl.h>
32 /** Protocol family specification, takes the values CATTA_PROTO_INET, CATTA_PROTO_INET6, CATTA_PROTO_UNSPEC */
33 typedef int CattaProtocol;
35 /** Numeric network interface index. Takes OS dependent values and the special constant CATTA_IF_UNSPEC */
36 typedef int CattaIfIndex;
38 /** Values for CattaProtocol */
40 CATTA_PROTO_INET = 0, /**< IPv4 */
41 CATTA_PROTO_INET6 = 1, /**< IPv6 */
42 CATTA_PROTO_UNSPEC = -1 /**< Unspecified/all protocol(s) */
45 /** Special values for CattaIfIndex */
47 CATTA_IF_UNSPEC = -1 /**< Unspecified/all interface(s) */
50 /** Maximum size of an address in string form */
51 #define CATTA_ADDRESS_STR_MAX 40 /* IPv6 Max = 4*8 + 7 + 1 for NUL */
53 /** Return TRUE if the specified interface index is valid */
54 #define CATTA_IF_VALID(iface) (((iface) >= 0) || ((iface) == CATTA_IF_UNSPEC))
56 /** Return TRUE if the specified protocol is valid */
57 #define CATTA_PROTO_VALID(protocol) (((protocol) == CATTA_PROTO_INET) || ((protocol) == CATTA_PROTO_INET6) || ((protocol) == CATTA_PROTO_UNSPEC))
59 /** An IPv4 address */
60 typedef struct CattaIPv4Address {
61 uint32_t address; /**< Address data in network byte order. */
64 /** An IPv6 address */
65 typedef struct CattaIPv6Address {
66 uint8_t address[16]; /**< Address data */
69 /** Protocol (address family) independent address structure */
70 typedef struct CattaAddress {
71 CattaProtocol proto; /**< Address family */
74 CattaIPv6Address ipv6; /**< Address when IPv6 */
75 CattaIPv4Address ipv4; /**< Address when IPv4 */
76 uint8_t data[1]; /**< Type-independent data field */
80 /** @{ \name Comparison */
82 /** Compare two addresses. Returns 0 when equal, a negative value when a < b, a positive value when a > b. */
83 int catta_address_cmp(const CattaAddress *a, const CattaAddress *b);
87 /** @{ \name String conversion */
89 /** Convert the specified address *a to a human readable character string, use CATTA_ADDRESS_STR_MAX to allocate an array of the right size */
90 char *catta_address_snprint(char *ret_s, size_t length, const CattaAddress *a);
92 /** Convert the specified human readable character string to an
93 * address structure. Set af to CATTA_UNSPEC for automatic address
94 * family detection. */
95 CattaAddress *catta_address_parse(const char *s, CattaProtocol af, CattaAddress *ret_addr);
100 /** Generate the DNS reverse lookup name for an IPv4 or IPv6 address. */
101 char* catta_reverse_lookup_name(const CattaAddress *a, char *ret_s, size_t length);
104 /** @{ \name Protocol/address family handling */
106 /** Map CATTA_PROTO_xxx constants to Unix AF_xxx constants */
107 int catta_proto_to_af(CattaProtocol proto);
109 /** Map Unix AF_xxx constants to CATTA_PROTO_xxx constants */
110 CattaProtocol catta_af_to_proto(int af);
112 /** Return a textual representation of the specified protocol number. i.e. "IPv4", "IPv6" or "UNSPEC" */
113 const char* catta_proto_to_string(CattaProtocol proto);