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Add missing inet_ntop function
This commit is contained in:
Stephen Heumann
parent
ff78ce7134
commit
e39285b030
@ -13,7 +13,8 @@ LIBTELNET_SRCS = \
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libtelnet/sra.c \
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libtelnet/getaddrinfo.c \
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libtelnet/strlcpy.c \
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libtelnet/vasprintf.c
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libtelnet/vasprintf.c \
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libtelnet/inet_ntop.c
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# libtelnet/pk.c
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TELNET_SRCS = \
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@ -48,6 +49,9 @@ HEADERS = \
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libtelnet/misc.h \
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libtelnet/pk.h \
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libtelnet/getaddrinfo.h \
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libtelnet/strlcpy.h \
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libtelnet/vasprintf.h \
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libtelnet/inet_ntop.h \
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telnet/baud.h \
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telnet/defines.h \
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telnet/externs.h \
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204
libtelnet/inet_ntop.c
Normal file
204
libtelnet/inet_ntop.c
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@ -0,0 +1,204 @@
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1996-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef __GNO__
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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$Id: inet_ntop.c,v 1.5 2005/11/03 22:59:52 marka Exp $";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include "libtelnet/strlcpy.h"
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typedef int socklen_t;
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static const char *inet_ntop4(const u_char *src, char *dst, socklen_t size);
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#ifdef INET6
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static const char *inet_ntop6(const u_char *src, char *dst, socklen_t size);
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#endif
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/* const char *
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* inet_ntop(af, src, dst, size)
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* convert a network format address to presentation format.
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* return:
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* pointer to presentation format address (`dst'), or NULL (see errno).
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* author:
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* Paul Vixie, 1996.
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*/
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const char *
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inet_ntop(int af, const void * src, char * dst, socklen_t size)
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{
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switch (af) {
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case AF_INET:
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return (inet_ntop4(src, dst, size));
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#ifdef INET6
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case AF_INET6:
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return (inet_ntop6(src, dst, size));
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#endif
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default:
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errno = EAFNOSUPPORT;
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return (NULL);
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}
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/* NOTREACHED */
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}
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/* const char *
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* inet_ntop4(src, dst, size)
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* format an IPv4 address
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* return:
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* `dst' (as a const)
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* notes:
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* (1) uses no statics
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* (2) takes a u_char* not an in_addr as input
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* author:
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* Paul Vixie, 1996.
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*/
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static const char *
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inet_ntop4(const u_char *src, char *dst, socklen_t size)
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{
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static const char fmt[] = "%u.%u.%u.%u";
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char tmp[16 /*sizeof "255.255.255.255"*/];
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int l;
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l = snprintf(tmp, sizeof(tmp), fmt, src[0], src[1], src[2], src[3]);
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if (l <= 0 || (socklen_t) l >= size) {
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errno = ENOSPC;
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return (NULL);
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}
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strlcpy(dst, tmp, size);
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return (dst);
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}
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#ifdef INET6
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/*%
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* WARNING: Don't even consider trying to compile this on a system where
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* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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*/
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/* const char *
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* inet_ntop6(src, dst, size)
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* convert IPv6 binary address into presentation (printable) format
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* author:
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* Paul Vixie, 1996.
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*/
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static const char *
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inet_ntop6(const u_char *src, char *dst, socklen_t size)
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{
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/*
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* Note that int32_t and int16_t need only be "at least" large enough
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* to contain a value of the specified size. On some systems, like
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* Crays, there is no such thing as an integer variable with 16 bits.
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* Keep this in mind if you think this function should have been coded
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* to use pointer overlays. All the world's not a VAX.
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*/
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char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
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struct { int base, len; } best, cur;
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u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
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int i;
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/*
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* Preprocess:
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* Copy the input (bytewise) array into a wordwise array.
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* Find the longest run of 0x00's in src[] for :: shorthanding.
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*/
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memset(words, '\0', sizeof words);
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for (i = 0; i < NS_IN6ADDRSZ; i++)
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words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
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best.base = -1;
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best.len = 0;
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cur.base = -1;
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cur.len = 0;
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
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if (words[i] == 0) {
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if (cur.base == -1)
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cur.base = i, cur.len = 1;
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else
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cur.len++;
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} else {
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if (cur.base != -1) {
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if (best.base == -1 || cur.len > best.len)
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best = cur;
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cur.base = -1;
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}
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}
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}
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if (cur.base != -1) {
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if (best.base == -1 || cur.len > best.len)
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best = cur;
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}
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if (best.base != -1 && best.len < 2)
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best.base = -1;
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/*
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* Format the result.
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*/
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tp = tmp;
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
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/* Are we inside the best run of 0x00's? */
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if (best.base != -1 && i >= best.base &&
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i < (best.base + best.len)) {
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if (i == best.base)
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*tp++ = ':';
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continue;
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}
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/* Are we following an initial run of 0x00s or any real hex? */
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if (i != 0)
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*tp++ = ':';
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/* Is this address an encapsulated IPv4? */
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if (i == 6 && best.base == 0 && (best.len == 6 ||
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(best.len == 7 && words[7] != 0x0001) ||
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(best.len == 5 && words[5] == 0xffff))) {
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if (!inet_ntop4(src+12, tp, sizeof tmp - (tp - tmp))) {
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errno = ENOSPC;
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return (NULL);
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}
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tp += strlen(tp);
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break;
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}
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tp += sprintf(tp, "%x", words[i]);
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}
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/* Was it a trailing run of 0x00's? */
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if (best.base != -1 && (best.base + best.len) ==
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(NS_IN6ADDRSZ / NS_INT16SZ))
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*tp++ = ':';
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*tp++ = '\0';
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/*
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* Check for overflow, copy, and we're done.
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*/
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if ((socklen_t)(tp - tmp) > size) {
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errno = ENOSPC;
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return (NULL);
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}
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strcpy(dst, tmp);
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return (dst);
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}
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#endif
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#endif
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1
libtelnet/inet_ntop.h
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1
libtelnet/inet_ntop.h
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@ -0,0 +1 @@
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const char *inet_ntop(int af, const void * src, char * dst, int size);
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@ -53,6 +53,7 @@ static const char sccsid[] = "@(#)commands.c 8.4 (Berkeley) 5/30/95";
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#include <netdb.h>
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#ifdef __GNO__
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# include "libtelnet/getaddrinfo.h"
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# include "libtelnet/inet_ntop.h"
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#endif
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#include <pwd.h>
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#include <signal.h>
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