| 1 | /*
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| 2 | Unix SMB/Netbios implementation.
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| 3 | SMB client library implementation
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| 4 | Copyright (C) Andrew Tridgell 1998
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| 5 | Copyright (C) Richard Sharpe 2000, 2002
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| 6 | Copyright (C) John Terpstra 2000
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| 7 | Copyright (C) Tom Jansen (Ninja ISD) 2002
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| 8 | Copyright (C) Derrell Lipman 2003-2008
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| 9 | Copyright (C) Jeremy Allison 2007, 2008
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| 10 |
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| 11 | This program is free software; you can redistribute it and/or modify
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| 12 | it under the terms of the GNU General Public License as published by
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| 13 | the Free Software Foundation; either version 3 of the License, or
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| 14 | (at your option) any later version.
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| 15 |
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| 16 | This program is distributed in the hope that it will be useful,
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| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | GNU General Public License for more details.
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| 20 |
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| 21 | You should have received a copy of the GNU General Public License
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| 22 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 23 | */
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| 24 |
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| 25 | #include "includes.h"
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| 26 | #include "libsmbclient.h"
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| 27 | #include "libsmb_internal.h"
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| 28 |
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| 29 |
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| 30 | /* Used by urldecode_talloc() */
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| 31 | static int
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| 32 | hex2int( unsigned int _char )
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| 33 | {
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| 34 | if ( _char >= 'A' && _char <='F')
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| 35 | return _char - 'A' + 10;
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| 36 | if ( _char >= 'a' && _char <='f')
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| 37 | return _char - 'a' + 10;
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| 38 | if ( _char >= '0' && _char <='9')
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| 39 | return _char - '0';
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| 40 | return -1;
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| 41 | }
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| 42 |
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| 43 | /*
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| 44 | * smbc_urldecode()
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| 45 | * and urldecode_talloc() (internal fn.)
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| 46 | *
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| 47 | * Convert strings of %xx to their single character equivalent. Each 'x' must
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| 48 | * be a valid hexadecimal digit, or that % sequence is left undecoded.
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| 49 | *
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| 50 | * dest may, but need not be, the same pointer as src.
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| 51 | *
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| 52 | * Returns the number of % sequences which could not be converted due to lack
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| 53 | * of two following hexadecimal digits.
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| 54 | */
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| 55 | static int
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| 56 | urldecode_talloc(TALLOC_CTX *ctx, char **pp_dest, const char *src)
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| 57 | {
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| 58 | int old_length = strlen(src);
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| 59 | int i = 0;
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| 60 | int err_count = 0;
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| 61 | size_t newlen = 1;
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| 62 | char *p, *dest;
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| 63 |
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| 64 | if (old_length == 0) {
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| 65 | return 0;
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| 66 | }
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| 67 |
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| 68 | *pp_dest = NULL;
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| 69 | for (i = 0; i < old_length; ) {
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| 70 | unsigned char character = src[i++];
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| 71 |
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| 72 | if (character == '%') {
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| 73 | int a = i+1 < old_length ? hex2int(src[i]) : -1;
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| 74 | int b = i+1 < old_length ? hex2int(src[i+1]) : -1;
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| 75 |
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| 76 | /* Replace valid sequence */
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| 77 | if (a != -1 && b != -1) {
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| 78 | /* Replace valid %xx sequence with %dd */
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| 79 | character = (a * 16) + b;
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| 80 | if (character == '\0') {
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| 81 | break; /* Stop at %00 */
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| 82 | }
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| 83 | i += 2;
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| 84 | } else {
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| 85 | err_count++;
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| 86 | }
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| 87 | }
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| 88 | newlen++;
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| 89 | }
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| 90 |
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| 91 | dest = TALLOC_ARRAY(ctx, char, newlen);
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| 92 | if (!dest) {
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| 93 | return err_count;
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| 94 | }
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| 95 |
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| 96 | err_count = 0;
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| 97 | for (p = dest, i = 0; i < old_length; ) {
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