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netaddr.h
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/* * ProFTPD - FTP server daemon * Copyright (c) 2003-2011 The ProFTPD Project team * * 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 2 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA. * * As a special exemption, The ProFTPD Project team and other respective * copyright holders give permission to link this program with OpenSSL, and * distribute the resulting executable, without including the source code for * OpenSSL in the source distribution. */ /* Network address API * $Id: netaddr.h,v 1.28 2011/05/23 20:35:35 castaglia Exp $ */ #ifndef PR_NETADDR_H #define PR_NETADDR_H #include "conf.h" #ifndef HAVE_STRUCT_ADDRINFO struct addrinfo { /* AI_PASSIVE, AI_CANONNAME */ int ai_flags; /* AF/PF_xxx */ int ai_family; /* SOCK_xxx */ int ai_socktype; /* IPPROTO_xxx for IPv4/v6 */ int ai_protocol; /* Length of ai_addr */ int ai_addrlen; /* Canonical name for host */ char *ai_canonname; /* Binary address */ struct sockaddr *ai_addr; /* Next structure in the linked list */ struct addrinfo *ai_next; }; #endif /* HAVE_STRUCT_ADDRINFO */ #if defined(HAVE_GETADDRINFO) && !defined(PR_USE_GETADDRINFO) /* Use the system getaddrinfo(2) and freeaddrinfo(2) by redefining the * 'pr_getaddrinfo' and 'pr_freeaddrinfo' symbols to be 'getaddrinfo' and * 'freeaddrinfo', respectively. */ # define pr_getaddrinfo getaddrinfo # define pr_freeaddrinfo freeaddrinfo #else int pr_getaddrinfo(const char *, const char *, const struct addrinfo *, struct addrinfo **); void pr_freeaddrinfo(struct addrinfo *); #endif /* HAVE_GETNAMEINFO and !PR_USE_GETNAMEINFO */ /* These AI_ defines are for use by getaddrinfo(3). */ /* Indicates that the socket is intended for bind()+listen(). */ #ifndef AI_PASSIVE # define AI_PASSIVE 1 #endif /* AI_PASSIVE */ /* Return the canonical name. */ #ifndef AI_CANONNAME # define AI_CANONNAME 2 #endif /* AI_CANONNAME */ /* The following EAI_ defines are for errors. */ /* Host address family not supported. */ #ifndef EAI_ADDRFAMILY # define EAI_ADDRFAMILY -1 #endif /* EAI_ADDRFAMILY */ /* Temporary failure in name resolution. */ #ifndef EAI_AGAIN # define EAI_AGAIN -2 #endif /* EAI_AGAIN */ /* Invalid value for ai_flags. */ #ifndef EAI_BADFLAGS # define EAI_BADFLAGS -3 #endif /* EAI_BADFLAGS */ /* Non-recoverable failure in name resolution. */ #ifndef EAI_FAIL # define EAI_FAIL -4 #endif /* EAI_FAIL */ /* ai_family not supported. */ #ifndef EAI_FAMILY # define EAI_FAMILY -5 #endif /* EAI_FAMILY */ /* Memory allocation failure. */ #ifndef EAI_MEMORY # define EAI_MEMORY -6 #endif /* EAI_MEMORY */ /* No address associated with host. */ #ifndef EAI_NODATA # define EAI_NODATA -7 #endif /* EAI_NODATA */ /* Host nor service not provided, or not known. */ #ifndef EAI_NONAME # define EAI_NONAME -8 #endif /* EAI_NONAME */ /* Service not supported for ai_socktype. */ #ifndef EAI_SERVICE # define EAI_SERVICE -9 #endif /* EAI_SERVICE */ /* ai_socktype not supported. */ #ifndef EAI_SOCKTYPE # define EAI_SOCKTYPE -10 #endif /* EAI_SOCKTYPE */ /* System error contained in errno. */ #ifndef EAI_SYSTEM # define EAI_SYSTEM -11 #endif /* EAI_SYSTEM */ #if defined(HAVE_GETNAMEINFO) && !defined(PR_USE_GETNAMEINFO) /* Use the system getnameinfo(2) by redefining the 'pr_getnameinfo' symbol * to be simply 'getnameinfo'. */ # define pr_getnameinfo getnameinfo #else int pr_getnameinfo(const struct sockaddr *, socklen_t, char *, size_t, char *, size_t, int); #endif /* HAVE_GETNAMEINFO and !PR_USE_GETNAMEINFO */ /* These NI_ defines are for use by getnameinfo(3). */ /* Max hostname length returned. */ #ifndef NI_MAXHOST # define NI_MAXHOST 1025 #endif /* NI_MAXHOST */ /* Max service name length returned. */ #ifndef NI_MAXSERV # define NI_MAXSERV 32 #endif /* NI_MAXSERV */ /* Do not return FQDNs. */ #ifndef NI_NOFQDN # define NI_NOFQDN 1 #endif /* NI_NOFQDN */ /* Return the numeric form of the hostname. */ #ifndef NI_NUMERICHOST # define NI_NUMERICHOST 2 #endif /* NI_NUMERICHOST */ /* Return an error if hostname is not found. */ #ifndef NI_NAMEREQD # define NI_NAMEREQD 4 #endif /* NI_NAMEREQD */ /* Return the numeric form of the service name. */ #ifndef NI_NUMERICSERV # define NI_NUMERICSERV 8 #endif /* NI_NUMERICSERV */ /* Datagram service for getservbyname(). */ #ifndef NI_DGRAM # define NI_DGRAM 16 #endif /* NI_DGRAM */ #if defined(HAVE_INET_NTOP) /* Use the system inet_ntop(3) by redefining the 'pr_inet_ntop' symbol to be * 'inet_ntop'. */ # define pr_inet_ntop inet_ntop #else const char *pr_inet_ntop(int, const void *, char *, size_t); #endif #if defined(HAVE_INET_PTON) /* Use the system inet_pton(3) by redefining the 'pr_inet_pton' symbol to be * 'inet_pton'. */ # define pr_inet_pton inet_pton #else int pr_inet_pton(int, const char *, void *); #endif /* Network Address API */ /* Allocate an initialized netaddr from the given pool. */ pr_netaddr_t *pr_netaddr_alloc(pool *); /* Duplicate a netaddr using the given pool. */ pr_netaddr_t *pr_netaddr_dup(pool *, pr_netaddr_t *); /* Initialize the given netaddr. */ void pr_netaddr_clear(pr_netaddr_t *); /* Given a name (either an IP address string or a DNS name), return a * pr_netaddr_t * for that name. In the case of DNS names, multiple * addresses might be associated with given name; callers that are interested * in these additional addresses should provide a pointer to an array_header *, * which will be filled with an array_header (allocated from the given pool) * that contains a list of additional pr_netaddr_t *'s. * * If there is a failure in resolving the given name to its address(es), * NULL will be return, and an error logged. */ pr_netaddr_t *pr_netaddr_get_addr(pool *, const char *, array_header **); /* Compare the two given pr_netaddr_ts. In order for the comparison to * be accurate, the pr_netaddr_ts must be of the same family (AF_INET or * AF_INET6). In the case where the pr_netaddr_ts are from different * families, -1 will be returned, with errno set to EINVAL. Otherwise, * the comparison is a fancy memcmp(). */ int pr_netaddr_cmp(const pr_netaddr_t *, const pr_netaddr_t *); /* Compare the first N bits of the two given pr_netaddr_ts. In order for * the comparison to be accurate, the pr_netaddr_ts must be of the same family * (AF_INET or AF_INET6). In the case where the pr_netaddr_ts are from * different families, -1 will be returned, with errno set to EINVAL. * Otherwise, the comparison is a fancy memcmp(). */ int pr_netaddr_ncmp(const pr_netaddr_t *, const pr_netaddr_t *, unsigned int); /* Compare the given pr_netaddr_t against a glob pattern, as intended for * fnmatch(3). The flags parameter is an OR of the following values: * PR_NETADDR_MATCH_DNS and PR_NETADDR_MATCH_IP. If the PR_NETADDR_MATCH_DNS * flag is used, the given pattern will be matched against the DNS string of * the netaddr, if present. If that doesn't match, and if the * PR_NETADDR_MATCH_IP flag is used, a comparison against the IP address string * will be tried. A return value of -1, with errno set to EINVAL, occurs if * the netaddr or pattern are NULL. Otherwise, TRUE is returned if the address * is matched by the pattern, or FALSE if is not matched. */ int pr_netaddr_fnmatch(pr_netaddr_t *, const char *, int); #define PR_NETADDR_MATCH_DNS 0x001 #define PR_NETADDR_MATCH_IP 0x002 /* Returns the size of the contained address (or -1, with errno set to EINVAL, * if NULL is used as the argument). If the pr_netaddr_t is of the AF_INET * family, the size of struct sockaddr_in is returned; if of the AF_INET6 * family, the size of struct sockaddr_in6 is returned. */ size_t pr_netaddr_get_sockaddr_len(const pr_netaddr_t *); /* Returns the size of the contained address (or -1, with errno set to EINVAL, * if NULL is used as the argument). If the pr_netaddr_t is of the AF_INET * family, the size of struct in_addr is returned; if of the AF_INET6 * family, the size of struct in6_addr is returned. */ size_t pr_netaddr_get_inaddr_len(const pr_netaddr_t *); /* Returns the family of the given pr_netaddr_t, either AF_INET or AF_INET6. * A NULL pr_netaddr_t will result in -1 being returned, and errno set to * EINVAL. */ int pr_netaddr_get_family(const pr_netaddr_t *); /* Sets the family on the given pr_netaddr_t. Returns 0 on success, or * -1 on error (as when NULL is used as the argument). */ int pr_netaddr_set_family(pr_netaddr_t *, int); /* Returns a void * pointing to either a struct in_addr (if the family of the * given pr_netaddr_t is AF_INET) or a struct in6_addr (if the family of the * given pr_netaddr_t is AF_INET6). Returns NULL on error. */ void *pr_netaddr_get_inaddr(const pr_netaddr_t *); /* Returns a struct sockaddr * (pointing to either a struct sockaddr_in or * a struct sockaddr_in6, depending on the family), or NULL if there was an * error. */ struct sockaddr *pr_netaddr_get_sockaddr(const pr_netaddr_t *); /* Set the contained sockaddr * in the given pr_netaddr_t to be the * sockaddr given. The family of the pr_netaddr_t must have been set * first. Returns 0 on success, and -1 on error. */ int pr_netaddr_set_sockaddr(pr_netaddr_t *, struct sockaddr *); /* Sets the address of the contained sockaddr to be the wildcard address. * Returns 0 on success, and -1 on error. */ int pr_netaddr_set_sockaddr_any(pr_netaddr_t *); /* Returns the port of the contained struct sockaddr *. */ unsigned int pr_netaddr_get_port(const pr_netaddr_t *); /* Sets the port on the contained struct sockaddr *. Returns 0 on success, * or -1 on error (as when NULL is given as the argument). */ int pr_netaddr_set_port(pr_netaddr_t *, unsigned int); /* Enables or disable use of reverse DNS lookups. Returns the previous * setting. */ int pr_netaddr_set_reverse_dns(int); /* Returns the DNS name associated with the given pr_netaddr_t. If DNS * lookups have been disabled, the returned string will be the IP address. * Returns NULL if there was an error. */ const char *pr_netaddr_get_dnsstr(pr_netaddr_t *); /* Returns the list of DNS names associated with the given pr_netaddr_t. * If DNS lookups have been disabled, an empty list will be returned. * NULL is returned if there is an error. */ array_header *pr_netaddr_get_dnsstr_list(pool *, pr_netaddr_t *); /* Returns the IP address associated with the given pr_netaddr_t. Returns * NULL if there was an error. */ const char *pr_netaddr_get_ipstr(pr_netaddr_t *); /* Returns the name of the local host, as returned by gethostname(2). The * returned string will be dup'd from the given pool, if any. */ const char *pr_netaddr_get_localaddr_str(pool *); /* Sets the name of the local host, overriding the name that would have * been returned by gethostname(2). * * This function is used to avoid using DNS lookups on the gethostname(2) * name in order to determine the IP address to use for the default * 'server config' vhost. */ int pr_netaddr_set_localaddr_str(const char *); uint32_t pr_netaddr_get_addrno(const pr_netaddr_t *); /* Returns TRUE if the given pr_netaddr_t contains a loopback address, * FALSE otherwise. */ int pr_netaddr_is_loopback(const pr_netaddr_t *); /* Returns TRUE if the given pr_netaddr_t is of the AF_INET6 family and * contains an IPv4-mapped IPv6 address; otherwise FALSE is returned. A * return value of -1 is used to indicate an error. */ int pr_netaddr_is_v4mappedv6(const pr_netaddr_t *); /* Given an IPv4-mapped IPv6 netaddr, returns an IPv4 netaddr allocated from * the given pool. Returns -1 if the given netaddr is not an IPv4-mapped * IPv6 address. */ pr_netaddr_t *pr_netaddr_v6tov4(pool *p, const pr_netaddr_t *); /* Returns TRUE if IPv6 support is enabled, FALSE otherwise. */ unsigned char pr_netaddr_use_ipv6(void); /* Disables runtime use of IPv6 functionality (assuming IPv6 is supported). */ void pr_netaddr_disable_ipv6(void); /* Enables runtime use of IPv6 functionality (assuming IPv6 is supported). */ void pr_netaddr_enable_ipv6(void); /* Return pointers to static memory which contains the local and remote * netaddr information for the sesssion. DO NOT MODIFY the pointed-to * memory! Returns NULL if no such session information exists. */ pr_netaddr_t *pr_netaddr_get_sess_local_addr(void); pr_netaddr_t *pr_netaddr_get_sess_remote_addr(void); const char *pr_netaddr_get_sess_remote_name(void); void pr_netaddr_set_sess_addrs(void); /* Clears the cache of netaddr objects. */ void pr_netaddr_clear_cache(void); /* Validates the DNS name returned. */ char *pr_netaddr_validate_dns_str(char *); /* Internal use only. */ void init_netaddr(void); #endif /* PR_NETADDR_H */