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Diffstat (limited to 'edns-subnet/edns-subnet.c')
| -rw-r--r-- | edns-subnet/edns-subnet.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/edns-subnet/edns-subnet.c b/edns-subnet/edns-subnet.c new file mode 100644 index 0000000000000..4c93192faf38e --- /dev/null +++ b/edns-subnet/edns-subnet.c @@ -0,0 +1,65 @@ +/* + * edns-subnet/edns-subnet.c - Subnet option related constants + * + * Copyright (c) 2013, NLnet Labs. All rights reserved. + * + * This software is open source. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of the NLNET LABS nor the names of its contributors may + * be used to endorse or promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ +/** + * \file + * Subnet option related constants. + */ + +#include "config.h" + +#ifdef CLIENT_SUBNET /* keeps splint happy */ +#include "edns-subnet/edns-subnet.h" +#include <string.h> + +int +copy_clear(uint8_t* dst, size_t dstlen, uint8_t* src, size_t srclen, size_t n) +{ + size_t intpart = n / 8; /* bytes */ + size_t fracpart = n % 8; /* bits */ + size_t written = intpart; + if (intpart > dstlen || intpart > srclen) + return 1; + if (fracpart && (intpart+1 > dstlen || intpart+1 > srclen)) + return 1; + memcpy(dst, src, intpart); + if (fracpart) { + dst[intpart] = src[intpart] & ~(0xFF >> fracpart); + written++; + } + memset(dst + written, 0, dstlen - written); + return 0; +} + +#endif /* CLIENT_SUBNET */ |