ares_create_query.c (2702B)
1 /* MIT License 2 * 3 * Copyright (c) 2023 Brad House 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a copy 6 * of this software and associated documentation files (the "Software"), to deal 7 * in the Software without restriction, including without limitation the rights 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 * copies of the Software, and to permit persons to whom the Software is 10 * furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 22 * SOFTWARE. 23 * 24 * SPDX-License-Identifier: MIT 25 */ 26 27 #include "ares_private.h" 28 29 static int ares_create_query_int(const char *name, int dnsclass, int type, 30 unsigned short id, int rd, 31 unsigned char **bufp, int *buflenp, 32 int max_udp_size) 33 { 34 ares_status_t status; 35 ares_dns_record_t *dnsrec = NULL; 36 size_t len; 37 ares_dns_flags_t rd_flag = rd ? ARES_FLAG_RD : 0; 38 39 if (name == NULL || bufp == NULL || buflenp == NULL) { 40 status = ARES_EFORMERR; 41 goto done; 42 } 43 44 *bufp = NULL; 45 *buflenp = 0; 46 47 status = ares_dns_record_create_query( 48 &dnsrec, name, (ares_dns_class_t)dnsclass, (ares_dns_rec_type_t)type, id, 49 rd_flag, (size_t)max_udp_size); 50 if (status != ARES_SUCCESS) { 51 goto done; 52 } 53 54 status = ares_dns_write(dnsrec, bufp, &len); 55 if (status != ARES_SUCCESS) { 56 goto done; 57 } 58 59 *buflenp = (int)len; 60 61 done: 62 ares_dns_record_destroy(dnsrec); 63 return (int)status; 64 } 65 66 int ares_create_query(const char *name, int dnsclass, int type, 67 unsigned short id, int rd, unsigned char **bufp, 68 int *buflenp, int max_udp_size) 69 { 70 return ares_create_query_int(name, dnsclass, type, id, rd, bufp, buflenp, 71 max_udp_size); 72 } 73 74 int ares_mkquery(const char *name, int dnsclass, int type, unsigned short id, 75 int rd, unsigned char **buf, int *buflen) 76 { 77 return ares_create_query_int(name, dnsclass, type, id, rd, buf, buflen, 0); 78 }