430 lines
14 KiB
C
430 lines
14 KiB
C
/*
|
|
* util/net_help.h - network help functions
|
|
*
|
|
* Copyright (c) 2007, NLnet Labs. All rights reserved.
|
|
*
|
|
* This software is open source.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* Neither the name of the NLNET LABS nor the names of its contributors may
|
|
* be used to endorse or promote products derived from this software without
|
|
* specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
|
|
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
|
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
*
|
|
* This file contains functions to perform network related tasks.
|
|
*/
|
|
|
|
#ifndef NET_HELP_H
|
|
#define NET_HELP_H
|
|
#include "util/log.h"
|
|
struct sock_list;
|
|
struct regional;
|
|
|
|
/** DNS constants for uint16_t style flag manipulation. host byteorder.
|
|
* 1 1 1 1 1 1
|
|
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
|
* +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
|
* |QR| Opcode |AA|TC|RD|RA| Z|AD|CD| RCODE |
|
|
* +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
|
*/
|
|
/** CD flag */
|
|
#define BIT_CD 0x0010
|
|
/** AD flag */
|
|
#define BIT_AD 0x0020
|
|
/** Z flag */
|
|
#define BIT_Z 0x0040
|
|
/** RA flag */
|
|
#define BIT_RA 0x0080
|
|
/** RD flag */
|
|
#define BIT_RD 0x0100
|
|
/** TC flag */
|
|
#define BIT_TC 0x0200
|
|
/** AA flag */
|
|
#define BIT_AA 0x0400
|
|
/** QR flag */
|
|
#define BIT_QR 0x8000
|
|
/** get RCODE bits from uint16 flags */
|
|
#define FLAGS_GET_RCODE(f) ((f) & 0xf)
|
|
/** set RCODE bits in uint16 flags */
|
|
#define FLAGS_SET_RCODE(f, r) (f = (((f) & 0xfff0) | (r)))
|
|
|
|
/** timeout in seconds for UDP queries to auth servers. */
|
|
#define UDP_AUTH_QUERY_TIMEOUT 4
|
|
/** timeout in seconds for TCP queries to auth servers. */
|
|
#define TCP_AUTH_QUERY_TIMEOUT 30
|
|
/** Advertised version of EDNS capabilities */
|
|
#define EDNS_ADVERTISED_VERSION 0
|
|
/** Advertised size of EDNS capabilities */
|
|
extern uint16_t EDNS_ADVERTISED_SIZE;
|
|
/** bits for EDNS bitfield */
|
|
#define EDNS_DO 0x8000 /* Dnssec Ok */
|
|
/** byte size of ip4 address */
|
|
#define INET_SIZE 4
|
|
/** byte size of ip6 address */
|
|
#define INET6_SIZE 16
|
|
|
|
/** DNSKEY zone sign key flag */
|
|
#define DNSKEY_BIT_ZSK 0x0100
|
|
/** DNSKEY secure entry point, KSK flag */
|
|
#define DNSKEY_BIT_SEP 0x0001
|
|
|
|
/** minimal responses when positive answer */
|
|
extern int MINIMAL_RESPONSES;
|
|
|
|
/** rrset order roundrobin */
|
|
extern int RRSET_ROUNDROBIN;
|
|
|
|
/**
|
|
* See if string is ip4 or ip6.
|
|
* @param str: IP specification.
|
|
* @return: true if string addr is an ip6 specced address.
|
|
*/
|
|
int str_is_ip6(const char* str);
|
|
|
|
/**
|
|
* Set fd nonblocking.
|
|
* @param s: file descriptor.
|
|
* @return: 0 on error (error is printed to log).
|
|
*/
|
|
int fd_set_nonblock(int s);
|
|
|
|
/**
|
|
* Set fd (back to) blocking.
|
|
* @param s: file descriptor.
|
|
* @return: 0 on error (error is printed to log).
|
|
*/
|
|
int fd_set_block(int s);
|
|
|
|
/**
|
|
* See if number is a power of 2.
|
|
* @param num: the value.
|
|
* @return: true if the number is a power of 2.
|
|
*/
|
|
int is_pow2(size_t num);
|
|
|
|
/**
|
|
* Allocate memory and copy over contents.
|
|
* @param data: what to copy over.
|
|
* @param len: length of data.
|
|
* @return: NULL on malloc failure, or newly malloced data.
|
|
*/
|
|
void* memdup(void* data, size_t len);
|
|
|
|
/**
|
|
* Prints the sockaddr in readable format with log_info. Debug helper.
|
|
* @param v: at what verbosity level to print this.
|
|
* @param str: descriptive string printed with it.
|
|
* @param addr: the sockaddr to print. Can be ip4 or ip6.
|
|
* @param addrlen: length of addr.
|
|
*/
|
|
void log_addr(enum verbosity_value v, const char* str,
|
|
struct sockaddr_storage* addr, socklen_t addrlen);
|
|
|
|
/**
|
|
* Prints zone name and sockaddr in readable format with log_info. Debug.
|
|
* @param v: at what verbosity level to print this.
|
|
* @param str: descriptive string printed with it.
|
|
* @param zone: DNS domain name, uncompressed wireformat.
|
|
* @param addr: the sockaddr to print. Can be ip4 or ip6.
|
|
* @param addrlen: length of addr.
|
|
*/
|
|
void log_name_addr(enum verbosity_value v, const char* str, uint8_t* zone,
|
|
struct sockaddr_storage* addr, socklen_t addrlen);
|
|
|
|
/**
|
|
* Log errno and addr.
|
|
* @param str: descriptive string printed with it.
|
|
* @param err: errno string to print, i.e. strerror(errno).
|
|
* @param addr: the sockaddr to print. Can be ip4 or ip6.
|
|
* @param addrlen: length of addr.
|
|
*/
|
|
void log_err_addr(const char* str, const char* err,
|
|
struct sockaddr_storage* addr, socklen_t addrlen);
|
|
|
|
/**
|
|
* Convert address string, with "@port" appendix, to sockaddr.
|
|
* Uses DNS port by default.
|
|
* @param str: the string
|
|
* @param addr: where to store sockaddr.
|
|
* @param addrlen: length of stored sockaddr is returned.
|
|
* @return 0 on error.
|
|
*/
|
|
int extstrtoaddr(const char* str, struct sockaddr_storage* addr,
|
|
socklen_t* addrlen);
|
|
|
|
/**
|
|
* Convert ip address string and port to sockaddr.
|
|
* @param ip: ip4 or ip6 address string.
|
|
* @param port: port number, host format.
|
|
* @param addr: where to store sockaddr.
|
|
* @param addrlen: length of stored sockaddr is returned.
|
|
* @return 0 on error.
|
|
*/
|
|
int ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
|
|
socklen_t* addrlen);
|
|
|
|
/**
|
|
* Convert ip netblock (ip/netsize) string and port to sockaddr.
|
|
* performs a copy internally to avoid writing over 'ip' string.
|
|
* @param ip: ip4 or ip6 address string.
|
|
* @param port: port number, host format.
|
|
* @param addr: where to store sockaddr.
|
|
* @param addrlen: length of stored sockaddr is returned.
|
|
* @param net: netblock size is returned.
|
|
* @return 0 on error.
|
|
*/
|
|
int netblockstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
|
|
socklen_t* addrlen, int* net);
|
|
|
|
/**
|
|
* Convert address string, with "@port" appendix, to sockaddr.
|
|
* It can also have an "#tls-auth-name" appendix (after the port).
|
|
* The returned tls-auth-name string is a pointer into the input string.
|
|
* Uses DNS port by default.
|
|
* @param str: the string
|
|
* @param addr: where to store sockaddr.
|
|
* @param addrlen: length of stored sockaddr is returned.
|
|
* @param auth_name: returned pointer to tls_auth_name, or NULL if none.
|
|
* @return 0 on error.
|
|
*/
|
|
int authextstrtoaddr(char* str, struct sockaddr_storage* addr,
|
|
socklen_t* addrlen, char** auth_name);
|
|
|
|
/**
|
|
* Store port number into sockaddr structure
|
|
* @param addr: sockaddr structure, ip4 or ip6.
|
|
* @param addrlen: length of addr.
|
|
* @param port: port number to put into the addr.
|
|
*/
|
|
void sockaddr_store_port(struct sockaddr_storage* addr, socklen_t addrlen,
|
|
int port);
|
|
|
|
/**
|
|
* Print string with neat domain name, type and class.
|
|
* @param v: at what verbosity level to print this.
|
|
* @param str: string of message.
|
|
* @param name: domain name uncompressed wireformat.
|
|
* @param type: host format RR type.
|
|
* @param dclass: host format RR class.
|
|
*/
|
|
void log_nametypeclass(enum verbosity_value v, const char* str,
|
|
uint8_t* name, uint16_t type, uint16_t dclass);
|
|
|
|
/**
|
|
* Compare two sockaddrs. Imposes an ordering on the addresses.
|
|
* Compares address and port.
|
|
* @param addr1: address 1.
|
|
* @param len1: lengths of addr1.
|
|
* @param addr2: address 2.
|
|
* @param len2: lengths of addr2.
|
|
* @return: 0 if addr1 == addr2. -1 if addr1 is smaller, +1 if larger.
|
|
*/
|
|
int sockaddr_cmp(struct sockaddr_storage* addr1, socklen_t len1,
|
|
struct sockaddr_storage* addr2, socklen_t len2);
|
|
|
|
/**
|
|
* Compare two sockaddrs. Compares address, not the port.
|
|
* @param addr1: address 1.
|
|
* @param len1: lengths of addr1.
|
|
* @param addr2: address 2.
|
|
* @param len2: lengths of addr2.
|
|
* @return: 0 if addr1 == addr2. -1 if addr1 is smaller, +1 if larger.
|
|
*/
|
|
int sockaddr_cmp_addr(struct sockaddr_storage* addr1, socklen_t len1,
|
|
struct sockaddr_storage* addr2, socklen_t len2);
|
|
|
|
/**
|
|
* Checkout address family.
|
|
* @param addr: the sockaddr to examine.
|
|
* @param len: the length of addr.
|
|
* @return: true if sockaddr is ip6.
|
|
*/
|
|
int addr_is_ip6(struct sockaddr_storage* addr, socklen_t len);
|
|
|
|
/**
|
|
* Make sure the sockaddr ends in zeroes. For tree insertion and subsequent
|
|
* comparison.
|
|
* @param addr: the ip4 or ip6 addr.
|
|
* @param len: length of addr.
|
|
* @param net: number of bits to leave untouched, the rest of the netblock
|
|
* address is zeroed.
|
|
*/
|
|
void addr_mask(struct sockaddr_storage* addr, socklen_t len, int net);
|
|
|
|
/**
|
|
* See how many bits are shared, equal, between two addrs.
|
|
* @param addr1: first addr.
|
|
* @param net1: netblock size of first addr.
|
|
* @param addr2: second addr.
|
|
* @param net2: netblock size of second addr.
|
|
* @param addrlen: length of first addr and of second addr.
|
|
* They must be of the same length (i.e. same type IP4, IP6).
|
|
* @return: number of bits the same.
|
|
*/
|
|
int addr_in_common(struct sockaddr_storage* addr1, int net1,
|
|
struct sockaddr_storage* addr2, int net2, socklen_t addrlen);
|
|
|
|
/**
|
|
* Put address into string, works for IPv4 and IPv6.
|
|
* @param addr: address
|
|
* @param addrlen: length of address
|
|
* @param buf: result string stored here
|
|
* @param len: length of buf.
|
|
* On failure a string with "error" is stored inside.
|
|
*/
|
|
void addr_to_str(struct sockaddr_storage* addr, socklen_t addrlen,
|
|
char* buf, size_t len);
|
|
|
|
/**
|
|
* See if sockaddr is an ipv6 mapped ipv4 address, "::ffff:0.0.0.0"
|
|
* @param addr: address
|
|
* @param addrlen: length of address
|
|
* @return true if so
|
|
*/
|
|
int addr_is_ip4mapped(struct sockaddr_storage* addr, socklen_t addrlen);
|
|
|
|
/**
|
|
* See if sockaddr is 255.255.255.255.
|
|
* @param addr: address
|
|
* @param addrlen: length of address
|
|
* @return true if so
|
|
*/
|
|
int addr_is_broadcast(struct sockaddr_storage* addr, socklen_t addrlen);
|
|
|
|
/**
|
|
* See if sockaddr is 0.0.0.0 or ::0.
|
|
* @param addr: address
|
|
* @param addrlen: length of address
|
|
* @return true if so
|
|
*/
|
|
int addr_is_any(struct sockaddr_storage* addr, socklen_t addrlen);
|
|
|
|
/**
|
|
* Insert new socket list item. If fails logs error.
|
|
* @param list: pointer to pointer to first item.
|
|
* @param addr: address or NULL if 'cache'.
|
|
* @param len: length of addr, or 0 if 'cache'.
|
|
* @param region: where to allocate
|
|
*/
|
|
void sock_list_insert(struct sock_list** list, struct sockaddr_storage* addr,
|
|
socklen_t len, struct regional* region);
|
|
|
|
/**
|
|
* Append one list to another. Must both be from same qstate(regional).
|
|
* @param list: pointer to result list that is modified.
|
|
* @param add: item(s) to add. They are prepended to list.
|
|
*/
|
|
void sock_list_prepend(struct sock_list** list, struct sock_list* add);
|
|
|
|
/**
|
|
* Find addr in list.
|
|
* @param list: to search in
|
|
* @param addr: address to look for.
|
|
* @param len: length. Can be 0, look for 'cache entry'.
|
|
* @return true if found.
|
|
*/
|
|
int sock_list_find(struct sock_list* list, struct sockaddr_storage* addr,
|
|
socklen_t len);
|
|
|
|
/**
|
|
* Merge socklist into another socket list. Allocates the new entries
|
|
* freshly and copies them over, so also performs a region switchover.
|
|
* Allocation failures are logged.
|
|
* @param list: the destination list (checked for duplicates)
|
|
* @param region: where to allocate
|
|
* @param add: the list of entries to add.
|
|
*/
|
|
void sock_list_merge(struct sock_list** list, struct regional* region,
|
|
struct sock_list* add);
|
|
|
|
/**
|
|
* Log libcrypto error with descriptive string. Calls log_err().
|
|
* @param str: what failed.
|
|
*/
|
|
void log_crypto_err(const char* str);
|
|
|
|
/**
|
|
* Set SSL_OP_NOxxx options on SSL context to disable bad crypto
|
|
* @param ctxt: SSL_CTX*
|
|
* @return false on failure.
|
|
*/
|
|
int listen_sslctx_setup(void* ctxt);
|
|
|
|
/**
|
|
* Further setup of listening SSL context, after keys loaded.
|
|
* @param ctxt: SSL_CTX*
|
|
*/
|
|
void listen_sslctx_setup_2(void* ctxt);
|
|
|
|
/**
|
|
* create SSL listen context
|
|
* @param key: private key file.
|
|
* @param pem: public key cert.
|
|
* @param verifypem: if nonNULL, verifylocation file.
|
|
* return SSL_CTX* or NULL on failure (logged).
|
|
*/
|
|
void* listen_sslctx_create(char* key, char* pem, char* verifypem);
|
|
|
|
/**
|
|
* create SSL connect context
|
|
* @param key: if nonNULL (also pem nonNULL), the client private key.
|
|
* @param pem: client public key (or NULL if key is NULL).
|
|
* @param verifypem: if nonNULL used for verifylocation file.
|
|
* @return SSL_CTX* or NULL on failure (logged).
|
|
*/
|
|
void* connect_sslctx_create(char* key, char* pem, char* verifypem);
|
|
|
|
/**
|
|
* accept a new fd and wrap it in a BIO in SSL
|
|
* @param sslctx: the SSL_CTX to use (from listen_sslctx_create()).
|
|
* @param fd: from accept, nonblocking.
|
|
* @return SSL or NULL on alloc failure.
|
|
*/
|
|
void* incoming_ssl_fd(void* sslctx, int fd);
|
|
|
|
/**
|
|
* connect a new fd and wrap it in a BIO in SSL
|
|
* @param sslctx: the SSL_CTX to use (from connect_sslctx_create())
|
|
* @param fd: from connect.
|
|
* @return SSL or NULL on alloc failure
|
|
*/
|
|
void* outgoing_ssl_fd(void* sslctx, int fd);
|
|
|
|
/**
|
|
* Initialize openssl locking for thread safety
|
|
* @return false on failure (alloc failure).
|
|
*/
|
|
int ub_openssl_lock_init(void);
|
|
|
|
/**
|
|
* De-init the allocated openssl locks
|
|
*/
|
|
void ub_openssl_lock_delete(void);
|
|
|
|
#endif /* NET_HELP_H */
|