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INET_NET(3) Library Functions Manual INET_NET(3) NAME inet_net_ntop, inet_net_pton -- Internet network number manipulation rou- tines LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> char * inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size); int inet_net_pton(int af, const char *src, void *dst, size_t size); DESCRIPTION The inet_net_ntop() function converts an Internet network number from net- work format (usually a struct in_addr or some other binary form, in network byte order) to CIDR presentation format (suitable for external display pur- poses). The bits argument is the number of bits in src that are the net- work number. It returns NULL if a system error occurs (in which case, errno will have been set), or it returns a pointer to the destination string. The inet_net_pton() function converts a presentation format Internet net- work number (that is, printable form as held in a character string) to net- work format (usually a struct in_addr or some other internal binary repre- sentation, in network byte order). It returns the number of bits (either computed based on the class, or specified with /CIDR), or -1 if a failure occurred (in which case errno will have been set. It will be set to ENOENT if the Internet network number was not valid). The currently supported values for af are AF_INET and AF_INET6. The size argument is the size of the result buffer dst. NETWORK NUMBERS (IP VERSION 4) Internet network numbers may be specified in one of the following forms: a.b.c.d/bits a.b.c.d a.b.c a.b a When four parts are specified, each is interpreted as a byte of data and assigned, from left to right, to the four bytes of an Internet network num- ber. Note that when an Internet network number is viewed as a 32-bit inte- ger quantity on a system that uses little-endian byte order (such as the Intel 386, 486, and Pentium processors) the bytes referred to above appear as "d.c.b.a". That is, little-endian bytes are ordered from right to left. When a three part number is specified, the last part is interpreted as a 16-bit quantity and placed in the least significant two bytes of the Inter- net network number. When a two part number is supplied, the last part is interpreted as a 24-bit quantity and placed in the least significant three bytes of the In- ternet network number. When only one part is given, the value is stored directly in the Internet network number without any byte rearrangement. All numbers supplied as "parts" in a `.' notation may be decimal, octal, or hexadecimal, as specified in the C language (i.e., a leading 0x or 0X im- plies hexadecimal; otherwise, a leading 0 implies octal; otherwise, the number is interpreted as decimal). SEE ALSO byteorder(3), inet(3), networks(5) HISTORY The inet_net_ntop() and inet_net_pton() functions appeared in BIND 4.9.4. FreeBSD 14.3 November 9, 2021 INET_NET(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | NETWORK NUMBERS (IP VERSION 4) | SEE ALSO | HISTORY
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