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71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
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/* Skip over a (potentially compressed) domain name in 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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/* Advances *PTRPTR to skip over the compressed name it points at.
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Returns 0 on success, -1 (with errno set) on failure. */
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int
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___ns_name_skip (const unsigned char **ptrptr, const unsigned char *eom)
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{
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const unsigned char *cp;
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unsigned int n;
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cp = *ptrptr;
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while (cp < eom)
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{
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n = *cp++;
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if (n == 0)
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{
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/* End of domain name without indirection. */
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*ptrptr = cp;
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return 0;
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}
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/* Check for indirection. */
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switch (n & NS_CMPRSFLGS)
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{
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case 0: /* Normal case, n == len. */
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if (eom - cp < n)
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goto malformed;
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cp += n;
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break;
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case NS_CMPRSFLGS: /* Indirection. */
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if (cp == eom)
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/* No room for second indirection byte. */
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goto malformed;
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*ptrptr = cp + 1;
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return 0;
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default: /* Illegal type. */
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goto malformed;
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}
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}
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malformed:
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__set_errno (EMSGSIZE);
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return -1;
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}
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versioned_symbol (libc, ___ns_name_skip, ns_name_skip, GLIBC_2_34);
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versioned_symbol (libc, ___ns_name_skip, __ns_name_skip, GLIBC_PRIVATE);
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libc_hidden_ver (___ns_name_skip, __ns_name_skip)
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#if OTHER_SHLIB_COMPAT (libresolv, GLIBC_2_9, GLIBC_2_34)
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compat_symbol (libresolv, ___ns_name_skip, ns_name_skip, GLIBC_2_9);
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#endif
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