1 /* $OpenBSD: res_query.c,v 1.1 2012/09/08 11:08:21 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 <netinet/in.h> 20 21 #include <errno.h> 22 #include <resolv.h> 23 #include <string.h> 24 25 #include "asr.h" 26 27 int 28 res_query(const char *name, int class, int type, u_char *ans, int anslen) 29 { 30 struct async *as; 31 struct async_res ar; 32 33 if (ans == NULL || anslen <= 0) { 34 h_errno = NO_RECOVERY; 35 errno = EINVAL; 36 return (-1); 37 } 38 39 as = res_query_async(name, class, type, ans, anslen, NULL); 40 if (as == NULL) { 41 if (errno == EINVAL) 42 h_errno = NO_RECOVERY; 43 else 44 h_errno = NETDB_INTERNAL; 45 return (-1); /* errno set */ 46 } 47 48 async_run_sync(as, &ar); 49 50 if (ar.ar_errno) 51 errno = ar.ar_errno; 52 h_errno = ar.ar_h_errno; 53 54 if (ar.ar_h_errno != NETDB_SUCCESS) 55 return (-1); 56 57 return (ar.ar_datalen); 58 } 59 60 int 61 res_search(const char *name, int class, int type, u_char *ans, int anslen) 62 { 63 struct async *as; 64 struct async_res ar; 65 66 if (ans == NULL || anslen <= 0) { 67 h_errno = NO_RECOVERY; 68 errno = EINVAL; 69 return (-1); 70 } 71 72 as = res_search_async(name, class, type, ans, anslen, NULL); 73 if (as == NULL) { 74 if (errno == EINVAL) 75 h_errno = NO_RECOVERY; 76 else 77 h_errno = NETDB_INTERNAL; 78 return (-1); /* errno set */ 79 } 80 81 async_run_sync(as, &ar); 82 83 if (ar.ar_errno) 84 errno = ar.ar_errno; 85 h_errno = ar.ar_h_errno; 86 87 if (ar.ar_h_errno != NETDB_SUCCESS) 88 return (-1); 89 90 return (ar.ar_datalen); 91 } 92