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All Rights Reserved. .\" Portions Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved. .\" .TH INET_NTOP 3XNET "Nov 1, 2003" .SH NAME inet_ntop, inet_pton \- convert IPv4 and IPv6 addresses between binary and text form .SH SYNOPSIS .LP .nf \fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lxnet\fR [ \fIlibrary\fR ... ] #include \fBconst char *\fR\fBinet_ntop\fR(\fBint\fR \fIaf\fR, \fBconst void *restrict\fR \fIsrc\fR, \fBchar *restrict\fR \fIdst\fR, \fBsocklen_t\fR \fIsize\fR); .fi .LP .nf \fBint\fR \fBinet_pton\fR(\fBint\fR \fIaf\fR, \fBconst char *restrict\fR \fIsrc\fR, \fIdst\fR); .fi .SH DESCRIPTION .sp .LP The \fBinet_ntop()\fR function converts a numeric address into a text string suitable for presentation. The \fIaf\fR argument specifies the family of the address. This can be \fBAF_INET\fR or \fBAF_INET6\fR. The \fIsrc\fR argument points to a buffer holding an IPv4 address if the \fIaf\fR argument is \fBAF_INET\fR, or an IPv6 address if the \fIaf\fR argument is \fBAF_INET6\fR. The \fIdst\fR argument points to a buffer where the function stores the resulting text string; it cannot be \fINULL\fR. The \fIsize\fR argument specifies the size of this buffer, which must be large enough to hold the text string (\fBINET_ADDRSTRLEN\fR characters for IPv4, \fBINET6_ADDRSTRLEN\fR characters for IPv6). .sp .LP The \fBinet_pton()\fR function converts an address in its standard text presentation form into its numeric binary form. The \fIaf\fR argument specifies the family of the address. The \fBAF_INET\fR and \fBAF_INET6\fR address families are supported. The \fIsrc\fR argument points to the string being passed in. The \fIdst\fR argument points to a buffer into which the function stores the numeric address; this must be large enough to hold the numeric address (32 bits for \fBAF_INET\fR, 128 bits for \fBAF_INET6\fR). .sp .LP If the \fIaf\fR argument of \fBinet_pton()\fR is \fBAF_INET\fR, the \fIsrc\fR string is in the standard IPv4 dotted-decimal form: .sp .in +2 .nf ddd.ddd.ddd.ddd .fi .in -2 .sp .LP where "\fBddd\fR"is a one to three digit decimal number between 0 and 255 (see \fBinet_addr\fR(3XNET)). The \fBinet_pton()\fR function does not accept other formats (such as the octal numbers, hexadecimal numbers, and fewer than four numbers that \fBinet_addr()\fR accepts). .sp .LP If the \fIaf\fR argument of \fBinet_pton()\fR is \fBAF_INET6\fR, the \fIsrc\fR string is in one of the following standard IPv6 text forms: .RS +4 .TP 1. The preferred form is "\fBx:x:x:x:x:x:x:x\fR", where the '\fBx\fR's are the hexadecimal values of the eight 16-bit pieces of the address. Leading zeros in individual fields can be omitted, but there must be at least one numeral in every field. .RE .RS +4 .TP 2. A string of contiguous zero fields in the preferred form can be shown as "\fB::\fR". The "\fB::\fR" can only appear once in an address. Unspecified addresses ("\fB0:0:0:0:0:0:0:0\fR") can be represented simply as "\fB::\fR". .RE .RS +4 .TP 3. A third form that is sometimes more convenient when dealing with a mixed environment of IPv4 and IPv6 nodes is "\fBx:x:x:x:x:x:d.d.d.d\fR", where the '\fBx\fR's are the hexadecimal values of the six high-order 16-bit pieces of the address, and the '\fBd\fR's are the decimal values of the four low-order 8-bit pieces of the address (standard IPv4 representation). .RE .sp .LP A more extensive description of the standard representations of IPv6 addresses can be found in RFC 2373. .SH RETURN VALUES .sp .LP The \fBinet_ntop()\fR function returns a pointer to the buffer containing the text string if the conversion succeeds. Otherwise it returns \fINULL\fR and sets \fBerrno\fR to indicate the error. .sp .LP The \fBinet_pton()\fR function returns 1 if the conversion succeeds, with the address pointed to by \fIdst\fR in network byte order. It returns 0 if the input is not a valid IPv4 dotted-decimal string or a valid IPv6 address string. It returns \(mi1 and sets \fBerrno\fR to \fBEAFNOSUPPORT\fR if the \fIaf\fR argument is unknown. .SH ERRORS .sp .LP The \fBinet_ntop()\fR and \fBinet_pton()\fR functions will fail if: .sp .ne 2 .na \fB\fBEAFNOSUPPORT\fR\fR .ad .RS 16n The \fIaf\fR argument is invalid. .RE .sp .ne 2 .na \fB\fBENOSPC\fR\fR .ad .RS 16n The size of the \fBinet_ntop()\fR result buffer is inadequate. .RE .SH ATTRIBUTES .sp .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Standard _ MT-Level MT-Safe .TE .SH SEE ALSO .sp .LP .BR inet_addr (3XNET), .BR attributes (7)