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>INET_NET(3) System Library Functions Manual INET_NET(3)
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>INET_NET(3) System Library Functions Manual INET_NET(3)
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NAME
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NAME
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inet_net_ntop, inet_net_pton - Internet network number manipulation rou-
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inet_net_ntop, inet_net_pton - Internet network number manipulation rou-
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tines
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tines
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SYNOPSIS
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SYNOPSIS
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#include <sys/socket.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/inet.h>
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char *
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char *
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inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size);
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inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size);
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int
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int
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inet_net_pton(int af, const char *src, void *dst, size_t size);
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inet_net_pton(int af, const char *src, void *dst, size_t size);
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DESCRIPTION
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DESCRIPTION
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The inet_net_ntop() function converts an Internet network number from
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The inet_net_ntop() function converts an Internet network number from
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network format (usually a struct in_addr or some other binary form, in
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network format (usually a struct in_addr or some other binary form, in
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network byte order) to CIDR presentation format (suitable for external
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network byte order) to CIDR presentation format (suitable for external
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display purposes). bits is the number of bits in src that are the net-
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display purposes). bits is the number of bits in src that are the net-
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work number. It returns NULL if a system error occurs (in which case,
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work number. It returns NULL if a system error occurs (in which case,
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errno will have been set), or it returns a pointer to the destination
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errno will have been set), or it returns a pointer to the destination
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string.
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string.
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The inet_net_pton() function converts a presentation format Internet net-
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The inet_net_pton() function converts a presentation format Internet net-
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work number (that is, printable form as held in a character string) to
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work number (that is, printable form as held in a character string) to
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network format (usually a struct in_addr or some other internal binary
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network format (usually a struct in_addr or some other internal binary
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representation, in network byte order). It returns the number of bits
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representation, in network byte order). It returns the number of bits
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(either computed based on the class, or specified with /CIDR), or -1 if a
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(either computed based on the class, or specified with /CIDR), or -1 if a
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failure occurred (in which case errno will have been set. It will be set
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failure occurred (in which case errno will have been set. It will be set
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to ENOENT if the Internet network number was not valid).
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to ENOENT if the Internet network number was not valid).
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The only value for af currently supported is AF_INET. size is the size
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The only value for af currently supported is AF_INET. size is the size
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of the result buffer dst.
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of the result buffer dst.
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NETWORK NUMBERS (IP VERSION 4)
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NETWORK NUMBERS (IP VERSION 4)
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Internet network numbers may be specified in one of the following forms:
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Internet network numbers may be specified in one of the following forms:
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a.b.c.d/bits
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a.b.c.d/bits
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a.b.c.d
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a.b.c.d
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a.b.c
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a.b.c
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a.b
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a.b
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a
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a
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When four parts are specified, each is interpreted as a byte of data and
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When four parts are specified, each is interpreted as a byte of data and
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assigned, from left to right, to the four bytes of an Internet network
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assigned, from left to right, to the four bytes of an Internet network
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number. Note that when an Internet network number is viewed as a 32-bit
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number. Note that when an Internet network number is viewed as a 32-bit
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integer quantity on a system that uses little-endian byte order (such as
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integer quantity on a system that uses little-endian byte order (such as
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the Intel 386, 486, and Pentium processors) the bytes referred to above
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the Intel 386, 486, and Pentium processors) the bytes referred to above
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appear as ``d.c.b.a''. That is, little-endian bytes are ordered from
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appear as ``d.c.b.a''. That is, little-endian bytes are ordered from
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right to left.
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right to left.
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When a three part number is specified, the last part is interpreted as a
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When a three part number is specified, the last part is interpreted as a
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16-bit quantity and placed in the rightmost two bytes of the Internet
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16-bit quantity and placed in the rightmost two bytes of the Internet
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network number. This makes the three part number format convenient for
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network number. This makes the three part number format convenient for
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specifying Class B network numbers as ``128.net.host''.
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specifying Class B network numbers as ``128.net.host''.
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|
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When a two part number is supplied, the last part is interpreted as a
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When a two part number is supplied, the last part is interpreted as a
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24-bit quantity and placed in the rightmost three bytes of the Internet
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24-bit quantity and placed in the rightmost three bytes of the Internet
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network number. This makes the two part number format convenient for
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network number. This makes the two part number format convenient for
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specifying Class A network numbers as ``net.host''.
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specifying Class A network numbers as ``net.host''.
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When only one part is given, the value is stored directly in the Internet
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When only one part is given, the value is stored directly in the Internet
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network number without any byte rearrangement.
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network number without any byte rearrangement.
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All numbers supplied as ``parts'' in a `.' notation may be decimal,
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All numbers supplied as ``parts'' in a `.' notation may be decimal,
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octal, or hexadecimal, as specified in the C language (i.e., a leading 0x
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octal, or hexadecimal, as specified in the C language (i.e., a leading 0x
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or 0X implies hexadecimal; otherwise, a leading 0 implies octal; other-
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or 0X implies hexadecimal; otherwise, a leading 0 implies octal; other-
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wise, the number is interpreted as decimal).
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wise, the number is interpreted as decimal).
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SEE ALSO
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SEE ALSO
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byteorder(3), inet(3), networks(5)
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byteorder(3), inet(3), networks(5)
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HISTORY
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HISTORY
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The inet_net_ntop and inet_net_pton functions first appeared in BIND
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The inet_net_ntop and inet_net_pton functions first appeared in BIND
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4.9.4.
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4.9.4.
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BSD June 18, 1997 BSD
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BSD June 18, 1997 BSD
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