| 1 | /*
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| 2 | Linux DNS client library implementation
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| 3 |
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| 4 | Copyright (C) 2006 Krishna Ganugapati <krishnag@centeris.com>
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| 5 | Copyright (C) 2006 Gerald Carter <jerry@samba.org>
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| 6 |
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| 7 | ** NOTE! The following LGPL license applies to the libaddns
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| 8 | ** library. This does NOT imply that all of Samba is released
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| 9 | ** under the LGPL
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| 10 |
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| 11 | This library is free software; you can redistribute it and/or
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| 12 | modify it under the terms of the GNU Lesser General Public
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| 13 | License as published by the Free Software Foundation; either
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| 14 | version 2.1 of the License, or (at your option) any later version.
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| 15 |
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| 16 | This library 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 GNU
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| 19 | Lesser 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 Lesser General Public
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| 22 | License along with this library; if not, see <http://www.gnu.org/licenses/>.
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| 23 | */
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| 24 |
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| 25 | #include "dns.h"
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| 26 | #include <ctype.h>
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| 27 |
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| 28 | static DNS_ERROR LabelList( TALLOC_CTX *mem_ctx,
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| 29 | const char *name,
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| 30 | struct dns_domain_label **presult )
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| 31 | {
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| 32 | struct dns_domain_label *result;
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| 33 | const char *dot;
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| 34 |
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| 35 | for (dot = name; *dot != '\0'; dot += 1) {
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| 36 | char c = *dot;
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| 37 |
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| 38 | if (c == '.')
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| 39 | break;
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| 40 |
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| 41 | if (c == '-') continue;
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| 42 | if ((c >= 'a') && (c <= 'z')) continue;
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| 43 | if ((c >= 'A') && (c <= 'Z')) continue;
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| 44 | if ((c >= '0') && (c <= '9')) continue;
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| 45 |
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| 46 | return ERROR_DNS_INVALID_NAME;
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| 47 | }
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| 48 |
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| 49 | if ((dot - name) > 63) {
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| 50 | /*
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| 51 | * DNS labels can only be 63 chars long
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| 52 | */
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| 53 | return ERROR_DNS_INVALID_NAME;
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| 54 | }
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| 55 |
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| 56 | if (!(result = TALLOC_ZERO_P(mem_ctx, struct dns_domain_label))) {
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| 57 | return ERROR_DNS_NO_MEMORY;
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| 58 | }
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| 59 |
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| 60 | if (*dot == '\0') {
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| 61 | /*
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| 62 | * No dot around, so this is the last component
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| 63 | */
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| 64 |
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| 65 | if (!(result->label = talloc_strdup(result, name))) {
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| 66 | TALLOC_FREE(result);
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| 67 | return ERROR_DNS_NO_MEMORY;
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| 68 | }
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| 69 | result->len = strlen(result->label);
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| 70 | *presult = result;
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| 71 | return ERROR_DNS_SUCCESS;
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| 72 | }
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| 73 |
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| 74 | if (dot[1] == '.') {
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| 75 | /*
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| 76 | * Two dots in a row, reject
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| 77 | */
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| 78 |
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| 79 | TALLOC_FREE(result);
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| 80 | return ERROR_DNS_INVALID_NAME;
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| 81 | }
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| 82 |
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| 83 | if (dot[1] != '\0') {
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| 84 | /*
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| 85 | * Something follows, get the rest
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| 86 | */
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| 87 |
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| 88 | DNS_ERROR err = LabelList(result, dot+1, &result->next);
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| 89 |
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| 90 | if (!ERR_DNS_IS_OK(err)) {
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| 91 | TALLOC_FREE(result);
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| 92 | return err;
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| 93 | }
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| 94 | }
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| 95 |
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| 96 | result->len = (dot - name);
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| 97 |
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| 98 | if (!(result->label = talloc_strndup(result, name, result->len))) {
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| 99 | TALLOC_FREE(result);
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| 100 | return ERROR_DNS_NO_MEMORY;
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| 101 | }
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| 102 |
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| 103 | *presult = result;
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| 104 | return ERROR_DNS_SUCCESS;
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| 105 | }
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| 106 |
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| 107 | DNS_ERROR dns_domain_name_from_string( TALLOC_CTX *mem_ctx,
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| 108 | const char *pszDomainName,
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| 109 | struct dns_domain_name **presult )
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| 110 | {
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| 111 | struct dns_domain_name *result;
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| 112 | DNS_ERROR err;
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| 113 |
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| 114 | if (!(result = talloc(mem_ctx, struct dns_domain_name))) {
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| 115 | return ERROR_DNS_NO_MEMORY;
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| 116 | }
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| 117 |
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| 118 | err = LabelList( result, pszDomainName, &result->pLabelList );
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| 119 | if (!ERR_DNS_IS_OK(err)) {
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| 120 | TALLOC_FREE(result);
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| 121 | return err;
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| 122 | }
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| 123 |
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| 124 | *presult = result;
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| 125 | return ERROR_DNS_SUCCESS;
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| 126 | }
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| 127 |
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| 128 | /*********************************************************************
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| 129 | *********************************************************************/
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| 130 |
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| 131 | char *dns_generate_keyname( TALLOC_CTX *mem_ctx )
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| 132 | {
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| 133 | char *result = NULL;
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| 134 | #if defined(WITH_DNS_UPDATES)
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| 135 |
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| 136 | uuid_t uuid;
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| 137 |
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| 138 | /*
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| 139 | * uuid_unparse gives 36 bytes plus '\0'
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| 140 | */
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| 141 | if (!(result = TALLOC_ARRAY(mem_ctx, char, 37))) {
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| 142 | return NULL;
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| 143 | }
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| 144 |
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| 145 | uuid_generate( uuid );
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| 146 | uuid_unparse( uuid, result );
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| 147 |
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| 148 | #endif
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| 149 |
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| 150 | return result;
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| 151 | }
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