432 lines
14 KiB
C
432 lines
14 KiB
C
/*
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* util/net_help.h - network help functions
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*
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* Copyright (c) 2007, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* This file contains functions to perform network related tasks.
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*/
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#ifndef NET_HELP_H
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#define NET_HELP_H
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#include "util/log.h"
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struct sock_list;
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struct regional;
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/** DNS constants for uint16_t style flag manipulation. host byteorder.
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* 1 1 1 1 1 1
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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* +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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* |QR| Opcode |AA|TC|RD|RA| Z|AD|CD| RCODE |
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* +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
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*/
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/** CD flag */
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#define BIT_CD 0x0010
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/** AD flag */
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#define BIT_AD 0x0020
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/** Z flag */
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#define BIT_Z 0x0040
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/** RA flag */
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#define BIT_RA 0x0080
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/** RD flag */
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#define BIT_RD 0x0100
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/** TC flag */
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#define BIT_TC 0x0200
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/** AA flag */
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#define BIT_AA 0x0400
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/** QR flag */
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#define BIT_QR 0x8000
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/** get RCODE bits from uint16 flags */
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#define FLAGS_GET_RCODE(f) ((f) & 0xf)
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/** set RCODE bits in uint16 flags */
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#define FLAGS_SET_RCODE(f, r) (f = (((f) & 0xfff0) | (r)))
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/** timeout in milliseconds for UDP queries to auth servers. */
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#define UDP_AUTH_QUERY_TIMEOUT 3000
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/** timeout in milliseconds for TCP queries to auth servers. */
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#define TCP_AUTH_QUERY_TIMEOUT 3000
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/** Advertised version of EDNS capabilities */
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#define EDNS_ADVERTISED_VERSION 0
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/** Advertised size of EDNS capabilities */
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extern uint16_t EDNS_ADVERTISED_SIZE;
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/** bits for EDNS bitfield */
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#define EDNS_DO 0x8000 /* Dnssec Ok */
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/** byte size of ip4 address */
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#define INET_SIZE 4
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/** byte size of ip6 address */
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#define INET6_SIZE 16
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/** DNSKEY zone sign key flag */
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#define DNSKEY_BIT_ZSK 0x0100
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/** DNSKEY secure entry point, KSK flag */
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#define DNSKEY_BIT_SEP 0x0001
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/** minimal responses when positive answer */
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extern int MINIMAL_RESPONSES;
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/** rrset order roundrobin */
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extern int RRSET_ROUNDROBIN;
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/**
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* See if string is ip4 or ip6.
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* @param str: IP specification.
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* @return: true if string addr is an ip6 specced address.
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*/
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int str_is_ip6(const char* str);
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/**
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* Set fd nonblocking.
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* @param s: file descriptor.
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* @return: 0 on error (error is printed to log).
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*/
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int fd_set_nonblock(int s);
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/**
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* Set fd (back to) blocking.
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* @param s: file descriptor.
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* @return: 0 on error (error is printed to log).
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*/
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int fd_set_block(int s);
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/**
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* See if number is a power of 2.
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* @param num: the value.
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* @return: true if the number is a power of 2.
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*/
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int is_pow2(size_t num);
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/**
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* Allocate memory and copy over contents.
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* @param data: what to copy over.
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* @param len: length of data.
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* @return: NULL on malloc failure, or newly malloced data.
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*/
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void* memdup(void* data, size_t len);
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/**
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* Prints the sockaddr in readable format with log_info. Debug helper.
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* @param v: at what verbosity level to print this.
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* @param str: descriptive string printed with it.
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* @param addr: the sockaddr to print. Can be ip4 or ip6.
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* @param addrlen: length of addr.
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*/
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void log_addr(enum verbosity_value v, const char* str,
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struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* Prints zone name and sockaddr in readable format with log_info. Debug.
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* @param v: at what verbosity level to print this.
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* @param str: descriptive string printed with it.
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* @param zone: DNS domain name, uncompressed wireformat.
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* @param addr: the sockaddr to print. Can be ip4 or ip6.
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* @param addrlen: length of addr.
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*/
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void log_name_addr(enum verbosity_value v, const char* str, uint8_t* zone,
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struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* Log errno and addr.
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* @param str: descriptive string printed with it.
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* @param err: errno string to print, i.e. strerror(errno).
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* @param addr: the sockaddr to print. Can be ip4 or ip6.
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* @param addrlen: length of addr.
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*/
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void log_err_addr(const char* str, const char* err,
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struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* Convert address string, with "@port" appendix, to sockaddr.
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* Uses DNS port by default.
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* @param str: the string
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* @param addr: where to store sockaddr.
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* @param addrlen: length of stored sockaddr is returned.
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* @return 0 on error.
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*/
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int extstrtoaddr(const char* str, struct sockaddr_storage* addr,
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socklen_t* addrlen);
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/**
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* Convert ip address string and port to sockaddr.
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* @param ip: ip4 or ip6 address string.
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* @param port: port number, host format.
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* @param addr: where to store sockaddr.
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* @param addrlen: length of stored sockaddr is returned.
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* @return 0 on error.
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*/
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int ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
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socklen_t* addrlen);
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/**
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* Convert ip netblock (ip/netsize) string and port to sockaddr.
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* performs a copy internally to avoid writing over 'ip' string.
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* @param ip: ip4 or ip6 address string.
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* @param port: port number, host format.
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* @param addr: where to store sockaddr.
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* @param addrlen: length of stored sockaddr is returned.
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* @param net: netblock size is returned.
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* @return 0 on error.
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*/
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int netblockstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
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socklen_t* addrlen, int* net);
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/**
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* Convert address string, with "@port" appendix, to sockaddr.
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* It can also have an "#tls-auth-name" appendix (after the port).
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* The returned tls-auth-name string is a pointer into the input string.
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* Uses DNS port by default.
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* @param str: the string
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* @param addr: where to store sockaddr.
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* @param addrlen: length of stored sockaddr is returned.
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* @param auth_name: returned pointer to tls_auth_name, or NULL if none.
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* @return 0 on error.
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*/
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int authextstrtoaddr(char* str, struct sockaddr_storage* addr,
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socklen_t* addrlen, char** auth_name);
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/**
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* Store port number into sockaddr structure
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* @param addr: sockaddr structure, ip4 or ip6.
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* @param addrlen: length of addr.
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* @param port: port number to put into the addr.
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*/
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void sockaddr_store_port(struct sockaddr_storage* addr, socklen_t addrlen,
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int port);
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/**
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* Print string with neat domain name, type and class.
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* @param v: at what verbosity level to print this.
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* @param str: string of message.
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* @param name: domain name uncompressed wireformat.
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* @param type: host format RR type.
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* @param dclass: host format RR class.
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*/
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void log_nametypeclass(enum verbosity_value v, const char* str,
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uint8_t* name, uint16_t type, uint16_t dclass);
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/**
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* Compare two sockaddrs. Imposes an ordering on the addresses.
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* Compares address and port.
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* @param addr1: address 1.
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* @param len1: lengths of addr1.
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* @param addr2: address 2.
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* @param len2: lengths of addr2.
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* @return: 0 if addr1 == addr2. -1 if addr1 is smaller, +1 if larger.
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*/
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int sockaddr_cmp(struct sockaddr_storage* addr1, socklen_t len1,
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struct sockaddr_storage* addr2, socklen_t len2);
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/**
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* Compare two sockaddrs. Compares address, not the port.
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* @param addr1: address 1.
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* @param len1: lengths of addr1.
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* @param addr2: address 2.
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* @param len2: lengths of addr2.
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* @return: 0 if addr1 == addr2. -1 if addr1 is smaller, +1 if larger.
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*/
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int sockaddr_cmp_addr(struct sockaddr_storage* addr1, socklen_t len1,
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struct sockaddr_storage* addr2, socklen_t len2);
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/**
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* Checkout address family.
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* @param addr: the sockaddr to examine.
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* @param len: the length of addr.
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* @return: true if sockaddr is ip6.
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*/
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int addr_is_ip6(struct sockaddr_storage* addr, socklen_t len);
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/**
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* Make sure the sockaddr ends in zeroes. For tree insertion and subsequent
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* comparison.
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* @param addr: the ip4 or ip6 addr.
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* @param len: length of addr.
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* @param net: number of bits to leave untouched, the rest of the netblock
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* address is zeroed.
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*/
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void addr_mask(struct sockaddr_storage* addr, socklen_t len, int net);
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/**
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* See how many bits are shared, equal, between two addrs.
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* @param addr1: first addr.
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* @param net1: netblock size of first addr.
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* @param addr2: second addr.
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* @param net2: netblock size of second addr.
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* @param addrlen: length of first addr and of second addr.
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* They must be of the same length (i.e. same type IP4, IP6).
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* @return: number of bits the same.
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*/
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int addr_in_common(struct sockaddr_storage* addr1, int net1,
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struct sockaddr_storage* addr2, int net2, socklen_t addrlen);
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/**
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* Put address into string, works for IPv4 and IPv6.
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* @param addr: address
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* @param addrlen: length of address
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* @param buf: result string stored here
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* @param len: length of buf.
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* On failure a string with "error" is stored inside.
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*/
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void addr_to_str(struct sockaddr_storage* addr, socklen_t addrlen,
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char* buf, size_t len);
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/**
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* See if sockaddr is an ipv6 mapped ipv4 address, "::ffff:0.0.0.0"
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* @param addr: address
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* @param addrlen: length of address
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* @return true if so
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*/
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int addr_is_ip4mapped(struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* See if sockaddr is 255.255.255.255.
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* @param addr: address
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* @param addrlen: length of address
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* @return true if so
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*/
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int addr_is_broadcast(struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* See if sockaddr is 0.0.0.0 or ::0.
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* @param addr: address
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* @param addrlen: length of address
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* @return true if so
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*/
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int addr_is_any(struct sockaddr_storage* addr, socklen_t addrlen);
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/**
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* Insert new socket list item. If fails logs error.
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* @param list: pointer to pointer to first item.
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* @param addr: address or NULL if 'cache'.
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* @param len: length of addr, or 0 if 'cache'.
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* @param region: where to allocate
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*/
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void sock_list_insert(struct sock_list** list, struct sockaddr_storage* addr,
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socklen_t len, struct regional* region);
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/**
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* Append one list to another. Must both be from same qstate(regional).
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* @param list: pointer to result list that is modified.
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* @param add: item(s) to add. They are prepended to list.
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*/
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void sock_list_prepend(struct sock_list** list, struct sock_list* add);
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/**
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* Find addr in list.
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* @param list: to search in
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* @param addr: address to look for.
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* @param len: length. Can be 0, look for 'cache entry'.
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* @return true if found.
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*/
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int sock_list_find(struct sock_list* list, struct sockaddr_storage* addr,
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socklen_t len);
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/**
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* Merge socklist into another socket list. Allocates the new entries
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* freshly and copies them over, so also performs a region switchover.
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* Allocation failures are logged.
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* @param list: the destination list (checked for duplicates)
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* @param region: where to allocate
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* @param add: the list of entries to add.
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*/
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void sock_list_merge(struct sock_list** list, struct regional* region,
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struct sock_list* add);
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/**
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* Log libcrypto error with descriptive string. Calls log_err().
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* @param str: what failed.
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*/
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void log_crypto_err(const char* str);
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/**
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* Set SSL_OP_NOxxx options on SSL context to disable bad crypto
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* @param ctxt: SSL_CTX*
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* @return false on failure.
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*/
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int listen_sslctx_setup(void* ctxt);
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/**
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* Further setup of listening SSL context, after keys loaded.
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* @param ctxt: SSL_CTX*
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*/
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void listen_sslctx_setup_2(void* ctxt);
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/**
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* create SSL listen context
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* @param key: private key file.
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* @param pem: public key cert.
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* @param verifypem: if nonNULL, verifylocation file.
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* return SSL_CTX* or NULL on failure (logged).
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*/
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void* listen_sslctx_create(char* key, char* pem, char* verifypem);
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/**
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* create SSL connect context
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* @param key: if nonNULL (also pem nonNULL), the client private key.
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* @param pem: client public key (or NULL if key is NULL).
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* @param verifypem: if nonNULL used for verifylocation file.
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* @param wincert: add system certificate store to ctx (add to verifypem ca
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* certs).
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* @return SSL_CTX* or NULL on failure (logged).
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*/
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void* connect_sslctx_create(char* key, char* pem, char* verifypem, int wincert);
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/**
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* accept a new fd and wrap it in a BIO in SSL
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* @param sslctx: the SSL_CTX to use (from listen_sslctx_create()).
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* @param fd: from accept, nonblocking.
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* @return SSL or NULL on alloc failure.
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*/
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void* incoming_ssl_fd(void* sslctx, int fd);
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/**
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* connect a new fd and wrap it in a BIO in SSL
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* @param sslctx: the SSL_CTX to use (from connect_sslctx_create())
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* @param fd: from connect.
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* @return SSL or NULL on alloc failure
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*/
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void* outgoing_ssl_fd(void* sslctx, int fd);
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/**
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* Initialize openssl locking for thread safety
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* @return false on failure (alloc failure).
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*/
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int ub_openssl_lock_init(void);
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/**
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* De-init the allocated openssl locks
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*/
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void ub_openssl_lock_delete(void);
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#endif /* NET_HELP_H */
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