1 /* $OpenBSD: res_send.c,v 1.8 2014/03/26 18:13:15 eric Exp $ */ 2 /* 3 * Copyright (c) 2012 Eric Faurot <eric@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/types.h> 19 #include <sys/socket.h> 20 #include <netinet/in.h> 21 #include <netdb.h> 22 23 #include <asr.h> 24 #include <errno.h> 25 #include <resolv.h> 26 #include <string.h> 27 #include <stdlib.h> 28 29 int 30 res_send(const u_char *buf, int buflen, u_char *ans, int anslen) 31 { 32 struct asr_query *as; 33 struct asr_result ar; 34 size_t len; 35 36 res_init(); 37 38 if (ans == NULL || anslen <= 0) { 39 errno = EINVAL; 40 return (-1); 41 } 42 43 as = res_send_async(buf, buflen, NULL); 44 if (as == NULL) 45 return (-1); /* errno set */ 46 47 asr_run_sync(as, &ar); 48 49 if (ar.ar_errno) { 50 errno = ar.ar_errno; 51 return (-1); 52 } 53 54 len = anslen; 55 if (ar.ar_datalen < len) 56 len = ar.ar_datalen; 57 memmove(ans, ar.ar_data, len); 58 free(ar.ar_data); 59 60 return (ar.ar_datalen); 61 } 62