host_addr.c File Reference

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Detailed Description

Host address functions.

Author:

Christian Biere

Date:

2005

#include "common.h"
#include "host_addr.h"
#include "misc.h"
#include "endian.h"
#include "walloc.h"
#include "override.h"

Functions
	RCSID ("$Id:host_addr.c, v 1.16 2005/12/20 13:28:42 cbiere Exp $")
gboolean	is_private_addr (const host_addr_t ha)
	Checks for RFC1918 private addresses.
gboolean	ipv4_addr_is_routable (guint32 ip)
gboolean	host_addr_is_loopback (const host_addr_t addr)
	Checks whether the given address is 127.0.0.1 or ::1.
gboolean	host_addr_is_routable (const host_addr_t addr)
	Check whether host can be reached from the Internet.
size_t	host_addr_to_string_buf (const host_addr_t ha, gchar *dst, size_t size)
	Prints the host address ``ha'' to ``dst''.
const gchar *	host_addr_to_string (const host_addr_t ha)
	Prints the host address ``ha'' to a static buffer.
size_t	host_addr_port_to_string_buf (const host_addr_t ha, guint16 port, gchar *dst, size_t size)
	Prints the host address ``ha'' followed by ``port'' to ``dst''.
const gchar *	host_addr_port_to_string (const host_addr_t ha, guint16 port)
	Prints the host address ``ha'' followed by ``port'' to a static buffer.
host_addr_t	string_to_host_addr (const char *s, const gchar **endptr)
	Parses IPv4 and IPv6 addresses.
gboolean	string_to_host_or_addr (const char *s, const gchar **endptr, host_addr_t *ha)
	Parses the NUL-terminated string ``s'' for a host address or a hostname.
gboolean	string_to_host_addr_port (const gchar *str, const gchar **endptr, host_addr_t *addr_ptr, guint16 *port_ptr)
void	gethostbyname_error (const gchar *host)
const gchar *	host_addr_to_name (const host_addr_t addr)
	Resolves an IP address to a hostname per DNS.
host_addr_t	name_to_host_addr (const gchar *host)
	Resolves a hostname to an IP address per DNS.
guint	host_addr_hash_func (gconstpointer key)
gboolean	host_addr_eq_func (gconstpointer p, gconstpointer q)
void	wfree_host_addr (gpointer key, gpointer unused_data)

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Function Documentation

void gethostbyname_error (  const gchar *  host  )  [static]

gboolean host_addr_eq_func (  gconstpointer  p, gconstpointer  q )

guint host_addr_hash_func (  gconstpointer  key  )

gboolean host_addr_is_loopback (  const host_addr_t  addr  )

Checks whether the given address is 127.0.0.1 or ::1.

gboolean host_addr_is_routable (  const host_addr_t  addr  )

Check whether host can be reached from the Internet. We rule out IPs of private networks, plus some other invalid combinations.

const gchar* host_addr_port_to_string (  const host_addr_t  ha, guint16  port )

Prints the host address ``ha'' followed by ``port'' to a static buffer. Parameters: ha  the host address. port  the port number. Returns: a pointer to a static buffer holding a NUL-terminated string representing the given host address and port.

size_t host_addr_port_to_string_buf (  const host_addr_t  ha, guint16  port, gchar *  dst, size_t  size )

Prints the host address ``ha'' followed by ``port'' to ``dst''. The string written to ``dst'' is always NUL-terminated unless ``size'' is zero. If ``size'' is too small, the string will be truncated. Parameters: dst  the destination buffer; may be NULL iff ``size'' is zero. ha  the host address. port  the port number. size  the size of ``dst'' in bytes. Returns: The length of the resulting string assuming ``size'' is sufficient.

const gchar* host_addr_to_name (  const host_addr_t  addr  )

Resolves an IP address to a hostname per DNS. Todo: TODO: Use getnameinfo() if available. Parameters: ha  The host address to resolve. Returns: On success, the hostname is returned. Otherwise, NULL is returned. The resulting string points to a static buffer.

const gchar* host_addr_to_string (  const host_addr_t  ha  )

Prints the host address ``ha'' to a static buffer. Parameters: ha  the host address. Returns: a pointer to a static buffer holding a NUL-terminated string representing the given host address.

size_t host_addr_to_string_buf (  const host_addr_t  ha, gchar *  dst, size_t  size )

Prints the host address ``ha'' to ``dst''. The string written to ``dst'' is always NUL-terminated unless ``size'' is zero. If ``size'' is too small, the string will be truncated. Parameters: dst  the destination buffer; may be NULL iff ``size'' is zero. ha  the host address. size  the size of ``dst'' in bytes. Returns: The length of the resulting string assuming ``size'' is sufficient.

gboolean ipv4_addr_is_routable (  guint32  ip  )  [inline, static]

gboolean is_private_addr (  const host_addr_t  ha  )

Checks for RFC1918 private addresses. Returns: TRUE if is a private address.

host_addr_t name_to_host_addr (  const gchar *  host  )

Resolves a hostname to an IP address per DNS. Todo: TODO: This should return all resolved address not just the first and it should be possible to request only IPv4 or IPv6 addresses. Parameters: host  A NUL-terminated string holding the hostname to resolve. Returns: On success, the first address IPv4 or IPv6 address is returned. On failure, zero_host_addr is returned.

RCSID (  "$Id:host_addr.  c, v 1.16 2005/12/20 13:28:42 cbiere Exp $"  )

host_addr_t string_to_host_addr (  const char *  s, const gchar **  endptr )

Parses IPv4 and IPv6 addresses. The latter requires IPv6 support to be enabled. "0.0.0.0" and "::" cannot be distinguished from unparsable addresses. Parameters: s  The string to parse. endptr  This will point to the first character after the parsed address. Returns: Returns the host address or ``zero_host_addr'' on failure.

gboolean string_to_host_addr_port (  const gchar *  str, const gchar **  endptr, host_addr_t *  addr_ptr, guint16 *  port_ptr )

gboolean string_to_host_or_addr (  const char *  s, const gchar **  endptr, host_addr_t *  ha )

Parses the NUL-terminated string ``s'' for a host address or a hostname. If ``s'' points to a parsable address, ``*ha'' will be set to it. Otherwise, ``*ha'' is set to ``zero_host_addr''. If the string is a possible hostname the function returns TRUE nonetheless and ``*endptr'' will point to the first character after hostname. If IPv6 support is disabled, "[::]" will be considered a hostname rather than a host address. Parameters: s  the string to parse. endptr  if not NULL, it will point the first character after the parsed host address or hostname. ha  if not NULL, it is set to the parsed host address or ``zero_host_addr'' on failure. Returns: TRUE if the string points to host address or is a possible hostname.

void wfree_host_addr (  gpointer  key, gpointer  unused_data )

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