158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/* Convert a DNS domain name from presentation to wire format.
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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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#include <arpa/nameser.h>
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#include <errno.h>
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#include <shlib-compat.h>
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/* Converts an ASCII string into an encoded domain name as per
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RFC1035. Returns -1 if it fails, 1 if string was fully qualified,
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0 is string was not fully qualified. Enforces label and domain
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length limits. */
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int
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___ns_name_pton (const char *src, unsigned char *dst, size_t dstsiz)
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{
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unsigned char *label, *bp, *eom;
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int c, n, escaped;
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escaped = 0;
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bp = dst;
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eom = dst + dstsiz;
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label = bp++;
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while ((c = *src++) != 0)
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{
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if (escaped)
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{
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if ('0' <= c && c <= '9')
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{
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n = (c - '0') * 100;
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if ((c = *src++) == 0 || c < '0' || c > '9')
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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n += (c - '0') * 10;
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if ((c = *src++) == 0 || c < '0' || c > '9')
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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n += c - '0';
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if (n > 255)
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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c = n;
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}
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escaped = 0;
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}
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else if (c == '\\')
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{
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escaped = 1;
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continue;
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}
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else if (c == '.')
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{
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c = (bp - label - 1);
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if ((c & NS_CMPRSFLGS) != 0) /* Label too big. */
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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if (label >= eom)
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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*label = c;
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/* Fully qualified ? */
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if (*src == '\0')
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{
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if (c != 0)
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{
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if (bp >= eom)
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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*bp++ = '\0';
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}
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if ((bp - dst) > MAXCDNAME)
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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return 1;
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}
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if (c == 0 || *src == '.')
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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label = bp++;
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continue;
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}
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if (bp >= eom)
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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*bp++ = (unsigned char) c;
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}
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if (escaped) /* Trailing backslash. */
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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c = (bp - label - 1);
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if ((c & NS_CMPRSFLGS) != 0) /* Label too big. */
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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if (label >= eom)
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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*label = c;
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if (c != 0)
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{
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if (bp >= eom)
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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*bp++ = 0;
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}
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if ((bp - dst) > MAXCDNAME) /* src too big. */
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{
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__set_errno (EMSGSIZE);
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return -1;
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}
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return 0;
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}
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versioned_symbol (libc, ___ns_name_pton, ns_name_pton, GLIBC_2_34);
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versioned_symbol (libc, ___ns_name_pton, __ns_name_pton, GLIBC_PRIVATE);
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libc_hidden_ver (___ns_name_pton, __ns_name_pton)
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#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34)
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compat_symbol (libresolv, ___ns_name_pton, ns_name_pton, GLIBC_2_9);
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#endif
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