aboutsummaryrefslogtreecommitdiff
path: root/lib/libc/inet/inet_net_ntop.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/libc/inet/inet_net_ntop.c')
-rw-r--r--lib/libc/inet/inet_net_ntop.c206
1 files changed, 52 insertions, 154 deletions
diff --git a/lib/libc/inet/inet_net_ntop.c b/lib/libc/inet/inet_net_ntop.c
index 9d98dbb5ca99..30dd5c0571f2 100644
--- a/lib/libc/inet/inet_net_ntop.c
+++ b/lib/libc/inet/inet_net_ntop.c
@@ -1,20 +1,23 @@
-/*-
- * SPDX-License-Identifier: ISC
+/* $OpenBSD: inet_net_ntop.c,v 1.9 2019/07/03 03:24:04 deraadt Exp $ */
+
+/*
+ * Copyright (c) 2012 by Gilles Chehade <gilles@openbsd.org>
+ * Copyright (c) 1996 by Internet Software Consortium.
*
- * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
- * Copyright (c) 1996,1999 by Internet Software Consortium.
+ * SPDX-License-Identifier: ISC
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
- * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
- * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
*/
#include "port_before.h"
@@ -31,18 +34,10 @@
#include "port_after.h"
-#ifdef SPRINTF_CHAR
-# define SPRINTF(x) strlen(sprintf/**/x)
-#else
-# define SPRINTF(x) ((size_t)sprintf x)
-#endif
-
-static char * inet_net_ntop_ipv4(const u_char *src, int bits, char *dst,
- size_t size);
-static char * inet_net_ntop_ipv6(const u_char *src, int bits, char *dst,
- size_t size);
+static char *inet_net_ntop_ipv4(const u_char *, int, char *, size_t);
+static char *inet_net_ntop_ipv6(const u_char *, int, char *, size_t);
-/*%
+/*
* char *
* inet_net_ntop(af, src, bits, dst, size)
* convert network number from network to presentation format.
@@ -66,7 +61,7 @@ inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
}
}
-/*%
+/*
* static char *
* inet_net_ntop_ipv4(src, bits, dst, size)
* convert IPv4 network number from network to presentation format.
@@ -83,53 +78,63 @@ static char *
inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
{
char *odst = dst;
- char *t;
u_int m;
int b;
+ char *ep;
+ int advance;
+
+ ep = dst + size;
+ if (ep <= dst)
+ goto emsgsize;
if (bits < 0 || bits > 32) {
errno = EINVAL;
return (NULL);
}
-
if (bits == 0) {
- if (size < sizeof "0")
+ if (ep - dst < sizeof "0")
goto emsgsize;
*dst++ = '0';
- size--;
*dst = '\0';
}
/* Format whole octets. */
for (b = bits / 8; b > 0; b--) {
- if (size <= sizeof "255.")
+ if (ep - dst < sizeof "255.")
+ goto emsgsize;
+ advance = snprintf(dst, ep - dst, "%u", *src++);
+ if (advance <= 0 || advance >= ep - dst)
goto emsgsize;
- t = dst;
- dst += SPRINTF((dst, "%u", *src++));
+ dst += advance;
if (b > 1) {
+ if (dst + 1 >= ep)
+ goto emsgsize;
*dst++ = '.';
*dst = '\0';
}
- size -= (size_t)(dst - t);
}
/* Format partial octet. */
b = bits % 8;
if (b > 0) {
- if (size <= sizeof ".255")
+ if (ep - dst < sizeof ".255")
goto emsgsize;
- t = dst;
if (dst != odst)
*dst++ = '.';
m = ((1 << b) - 1) << (8 - b);
- dst += SPRINTF((dst, "%u", *src & m));
- size -= (size_t)(dst - t);
+ advance = snprintf(dst, ep - dst, "%u", *src & m);
+ if (advance <= 0 || advance >= ep - dst)
+ goto emsgsize;
+ dst += advance;
}
/* Format CIDR /width. */
- if (size <= sizeof "/32")
+ if (ep - dst < sizeof "/32")
+ goto emsgsize;
+ advance = snprintf(dst, ep - dst, "/%u", bits);
+ if (advance <= 0 || advance >= ep - dst)
goto emsgsize;
- dst += SPRINTF((dst, "/%u", bits));
+ dst += advance;
return (odst);
emsgsize:
@@ -137,132 +142,27 @@ inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
return (NULL);
}
-/*%
- * static char *
- * inet_net_ntop_ipv6(src, bits, fakebits, dst, size)
- * convert IPv6 network number from network to presentation format.
- * generates CIDR style result always. Picks the shortest representation
- * unless the IP is really IPv4.
- * always prints specified number of bits (bits).
- * return:
- * pointer to dst, or NULL if an error occurred (check errno).
- * note:
- * network byte order assumed. this means 192.5.5.240/28 has
- * 0b11110000 in its fourth octet.
- * author:
- * Vadim Kogan (UCB), June 2001
- * Original version (IPv4) by Paul Vixie (ISC), July 1996
- */
-
static char *
-inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size) {
- u_int m;
- int b;
- int p;
- int zero_s, zero_l, tmp_zero_s, tmp_zero_l;
- int i;
- int is_ipv4 = 0;
- unsigned char inbuf[16];
- char outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")];
- char *cp;
- int words;
- u_char *s;
+inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
+{
+ int ret;
+ char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255:255:255:255/128")];
if (bits < 0 || bits > 128) {
errno = EINVAL;
return (NULL);
}
- cp = outbuf;
-
- if (bits == 0) {
- *cp++ = ':';
- *cp++ = ':';
- *cp = '\0';
- } else {
- /* Copy src to private buffer. Zero host part. */
- p = (bits + 7) / 8;
- memcpy(inbuf, src, p);
- memset(inbuf + p, 0, 16 - p);
- b = bits % 8;
- if (b != 0) {
- m = ~0 << (8 - b);
- inbuf[p-1] &= m;
- }
-
- s = inbuf;
-
- /* how many words need to be displayed in output */
- words = (bits + 15) / 16;
- if (words == 1)
- words = 2;
-
- /* Find the longest substring of zero's */
- zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0;
- for (i = 0; i < (words * 2); i += 2) {
- if ((s[i] | s[i+1]) == 0) {
- if (tmp_zero_l == 0)
- tmp_zero_s = i / 2;
- tmp_zero_l++;
- } else {
- if (tmp_zero_l && zero_l < tmp_zero_l) {
- zero_s = tmp_zero_s;
- zero_l = tmp_zero_l;
- tmp_zero_l = 0;
- }
- }
- }
-
- if (tmp_zero_l && zero_l < tmp_zero_l) {
- zero_s = tmp_zero_s;
- zero_l = tmp_zero_l;
- }
-
- if (zero_l != words && zero_s == 0 && ((zero_l == 6) ||
- ((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) ||
- ((zero_l == 7 && s[14] != 0 && s[15] != 1)))))
- is_ipv4 = 1;
-
- /* Format whole words. */
- for (p = 0; p < words; p++) {
- if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l) {
- /* Time to skip some zeros */
- if (p == zero_s)
- *cp++ = ':';
- if (p == words - 1)
- *cp++ = ':';
- s++;
- s++;
- continue;
- }
+ if (inet_ntop(AF_INET6, src, buf, size) == NULL)
+ return (NULL);
- if (is_ipv4 && p > 5 ) {
- *cp++ = (p == 6) ? ':' : '.';
- cp += SPRINTF((cp, "%u", *s++));
- /* we can potentially drop the last octet */
- if (p != 7 || bits > 120) {
- *cp++ = '.';
- cp += SPRINTF((cp, "%u", *s++));
- }
- } else {
- if (cp != outbuf)
- *cp++ = ':';
- cp += SPRINTF((cp, "%x", *s * 256 + s[1]));
- s += 2;
- }
- }
+ ret = snprintf(dst, size, "%s/%d", buf, bits);
+ if (ret < 0 || ret >= size) {
+ errno = EMSGSIZE;
+ return (NULL);
}
- /* Format CIDR /width. */
- sprintf(cp, "/%u", bits);
- if (strlen(outbuf) + 1 > size)
- goto emsgsize;
- strcpy(dst, outbuf);
return (dst);
-
-emsgsize:
- errno = EMSGSIZE;
- return (NULL);
}
/*
@@ -271,5 +171,3 @@ emsgsize:
*/
#undef inet_net_ntop
__weak_reference(__inet_net_ntop, inet_net_ntop);
-
-/*! \file */
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-19 09:00:00 +0000