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/* Copyright (C) 2020 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdbool.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdint.h>
#include <unistd.h>
/* Subnet maximum prefix length. */
#define IPV4_PREFIXLEN 32
#define IPV6_PREFIXLEN 128
/* Address string "address[@port]" maximum length. */
#define SOCKADDR_STRLEN_EXT (1 + 6) /* '@', 5 digits number, \0 */
#define SOCKADDR_STRLEN (sizeof(struct sockaddr_un) + SOCKADDR_STRLEN_EXT)
/*!
* \brief Calculate current structure length based on address family.
*
* \param ss Socket address.
*
* \return Number of bytes or error code.
*/
int sockaddr_len(const struct sockaddr_storage *ss);
/*!
* \brief Compare addresses.
*
* \param a First address.
* \param b Second address.
* \param ignore_port Ignore port indication.
*
* \return like memcmp(3)
*/
int sockaddr_cmp(const struct sockaddr_storage *a, const struct sockaddr_storage *b,
bool ignore_port);
/*!
* \brief Set address and port.
*
* \param ss Socket address.
* \param family Address family.
* \param straddr IP address in string format.
* \param port Port.
*
* \return KNOT_EOK on success or an error code.
*/
int sockaddr_set(struct sockaddr_storage *ss, int family, const char *straddr, int port);
/*!
* \brief Return raw network address in network byte order.
*
* \param[in] ss Socket address.
* \param[out] addr_size Address length.
*
* \return Pointer to binary buffer of size addr_size.
*/
void *sockaddr_raw(const struct sockaddr_storage *ss, size_t *addr_size);
/*!
* \brief Set raw address.
*
* \param ss Socket address.
* \param family Address family.
* \param raw_addr IP address in binary format.
* \param raw_addr_size Size of the binary address.
*
* \return KNOT_EOK on success or an error code.
*/
int sockaddr_set_raw(struct sockaddr_storage *ss, int family,
const uint8_t *raw_addr, size_t raw_addr_size);
/*!
* \brief Return string representation of socket address.
*
* \note String format: \<address>[@<port>], f.e. '127.0.0.1@53'
*
* \param buf Destination for string representation.
* \param maxlen Maximum number of written bytes.
* \param ss Socket address.
*
* \return Number of bytes written on success, error code on failure.
*/
int sockaddr_tostr(char *buf, size_t maxlen, const struct sockaddr_storage *ss);
/*!
* \brief Return port number from address.
*
* \param ss Socket address.
*
* \return Port number or error code.
*/
int sockaddr_port(const struct sockaddr_storage *ss);
/*!
* \brief Set port number.
*
* \param ss Socket address.
* \param port Port to set.
*/
void sockaddr_port_set(struct sockaddr_storage *ss, uint16_t port);
/*!
* \brief Get host FQDN address.
*
* \return Hostname string or NULL.
*/
char *sockaddr_hostname(void);
/*!
* \brief Check if address is ANY address.
*
* \param ss Socket address.
*/
bool sockaddr_is_any(const struct sockaddr_storage *ss);
/*!
* \brief Check if two addresses match the given network prefix.
*
* \param ss1 First address.
* \param ss2 Second address.
* \param prefix Prefix length.
*
* \return True on match.
*/
bool sockaddr_net_match(const struct sockaddr_storage *ss1,
const struct sockaddr_storage *ss2,
unsigned prefix);
/*!
* \brief Check if the address is within the given address range (inclusive).
*
* \param ss Address to check.
* \param ss_min Minimum address.
* \param ss_max Maximum address.
*
* \return True on match.
*/
bool sockaddr_range_match(const struct sockaddr_storage *ss,
const struct sockaddr_storage *ss_min,
const struct sockaddr_storage *ss_max);
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