1 /* $OpenBSD: res_query.c,v 1.3 2013/04/30 12:02:39 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 size_t len; 33 34 if (ans == NULL || anslen <= 0) { 35 h_errno = NO_RECOVERY; 36 errno = EINVAL; 37 return (-1); 38 } 39 40 as = res_query_async(name, class, type, NULL); 41 if (as == NULL) { 42 if (errno == EINVAL) 43 h_errno = NO_RECOVERY; 44 else 45 h_errno = NETDB_INTERNAL; 46 return (-1); /* errno set */ 47 } 48 49 async_run_sync(as, &ar); 50 51 if (ar.ar_errno) 52 errno = ar.ar_errno; 53 h_errno = ar.ar_h_errno; 54 55 if (ar.ar_h_errno != NETDB_SUCCESS) 56 return (-1); 57 58 len = anslen; 59 if (ar.ar_datalen < len) 60 len = ar.ar_datalen; 61 memmove(ans, ar.ar_data, len); 62 free(ar.ar_data); 63 64 return (ar.ar_datalen); 65 } 66 67 int 68 res_search(const char *name, int class, int type, u_char *ans, int anslen) 69 { 70 struct async *as; 71 struct async_res ar; 72 size_t len; 73 74 if (ans == NULL || anslen <= 0) { 75 h_errno = NO_RECOVERY; 76 errno = EINVAL; 77 return (-1); 78 } 79 80 as = res_search_async(name, class, type, NULL); 81 if (as == NULL) { 82 if (errno == EINVAL) 83 h_errno = NO_RECOVERY; 84 else 85 h_errno = NETDB_INTERNAL; 86 return (-1); /* errno set */ 87 } 88 89 async_run_sync(as, &ar); 90 91 if (ar.ar_errno) 92 errno = ar.ar_errno; 93 h_errno = ar.ar_h_errno; 94 95 if (ar.ar_h_errno != NETDB_SUCCESS) 96 return (-1); 97 98 len = anslen; 99 if (ar.ar_datalen < len) 100 len = ar.ar_datalen; 101 memmove(ans, ar.ar_data, len); 102 free(ar.ar_data); 103 104 return (ar.ar_datalen); 105 } 106