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123 lines
4.1 KiB
C
123 lines
4.1 KiB
C
/*
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* SSLsplit - transparent and scalable SSL/TLS interception
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* Copyright (c) 2009-2012, Daniel Roethlisberger <daniel@roe.ch>
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* All rights reserved.
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* http://www.roe.ch/SSLsplit
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include <string.h>
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/*
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* URL encoding functions.
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*/
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/*
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* URL decode insz bytes from in.
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* Returns allocated buffer containing outsz bytes plus a '\0' terminator.
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* If in does not contain valid URL encoded data, returns NULL.
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*/
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char *
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url_dec(const char *in, size_t insz, size_t *outsz)
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{
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static const int hex2dec[] = {
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-1, -1, -1, -1, -1, -1, -1, -1, /* 0 .. 7 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 8 .. 15 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 16 .. 23 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 24 .. 31 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 32 .. 39 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 40 .. 47 */
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0, 1, 2, 3, 4, 5, 6, 7, /* 48 .. 55 */
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8, 9, -1, -1, -1, -1, -1, -1, /* 56 .. 63 */
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-1, 10, 11, 12, 13, 14, 15, -1, /* 64 .. 71 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 72 .. 79 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 80 .. 87 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 88 .. 95 */
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-1, 10, 11, 12, 13, 14, 15, -1, /* 96 .. 103 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 104 .. 111 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 112 .. 119 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 120 .. 127 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 128 .. 135 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 136 .. 143 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 144 .. 151 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 152 .. 159 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 160 .. 167 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 168 .. 175 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 176 .. 183 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 184 .. 191 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 192 .. 199 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 200 .. 207 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 208 .. 215 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 216 .. 223 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 224 .. 231 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 232 .. 239 */
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-1, -1, -1, -1, -1, -1, -1, -1, /* 240 .. 247 */
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-1, -1, -1, -1, -1, -1, -1, -1 }; /* 248 .. 255 */
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size_t i, o;
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int hi, lo;
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char *out;
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if (insz == 0) {
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*outsz = 0;
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return strdup("");
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}
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for (i = 0, o = 0; i < insz; i++)
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if (in[i] == '%')
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o++;
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if (2 * o > insz) {
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*outsz = 0;
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return NULL;
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}
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*outsz = insz - (2 * o);
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if (!(out = malloc((*outsz) + 1))) {
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*outsz = 0;
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return NULL;
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}
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for (i = 0, o = 0; i < insz; i++, o++) {
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if (in[i] != '%') {
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out[o] = in[i];
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continue;
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}
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if (i + 2 >= insz)
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goto leave;
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if ((hi = hex2dec[(unsigned char)in[i + 1]]) == -1)
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goto leave;
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if ((lo = hex2dec[(unsigned char)in[i + 2]]) == -1)
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goto leave;
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out[o] = ((hi & 0xF) << 4) | (lo & 0xF);
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i += 2;
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}
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out[*outsz] = '\0';
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return out;
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leave:
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free(out);
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return NULL;
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}
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/* vim: set noet ft=c: */
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