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/* $OpenBSD: res_query.c,v 1.9 2015/10/05 02:57:16 guenther Exp $ */ |
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/* |
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* Copyright (c) 2012 Eric Faurot <eric@openbsd.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netdb.h> |
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#include <asr.h> |
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#include <errno.h> |
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#include <resolv.h> |
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#include <string.h> |
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#include <stdlib.h> |
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int |
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res_query(const char *name, int class, int type, u_char *ans, int anslen) |
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{ |
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struct asr_query *as; |
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struct asr_result ar; |
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size_t len; |
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res_init(); |
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if (ans == NULL || anslen <= 0) { |
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h_errno = NO_RECOVERY; |
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errno = EINVAL; |
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return (-1); |
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} |
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as = res_query_async(name, class, type, NULL); |
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if (as == NULL) { |
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if (errno == EINVAL) |
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h_errno = NO_RECOVERY; |
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else |
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h_errno = NETDB_INTERNAL; |
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return (-1); /* errno set */ |
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} |
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asr_run_sync(as, &ar); |
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if (ar.ar_errno) |
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errno = ar.ar_errno; |
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h_errno = ar.ar_h_errno; |
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if (ar.ar_h_errno != NETDB_SUCCESS) |
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return (-1); |
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len = anslen; |
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if (ar.ar_datalen < len) |
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len = ar.ar_datalen; |
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memmove(ans, ar.ar_data, len); |
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free(ar.ar_data); |
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return (ar.ar_datalen); |
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} |
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DEF_WEAK(res_query); |
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int |
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res_search(const char *name, int class, int type, u_char *ans, int anslen) |
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{ |
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struct asr_query *as; |
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struct asr_result ar; |
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size_t len; |
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res_init(); |
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if (ans == NULL || anslen <= 0) { |
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h_errno = NO_RECOVERY; |
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errno = EINVAL; |
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return (-1); |
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} |
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as = res_search_async(name, class, type, NULL); |
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if (as == NULL) { |
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if (errno == EINVAL) |
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h_errno = NO_RECOVERY; |
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else |
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h_errno = NETDB_INTERNAL; |
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return (-1); /* errno set */ |
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} |
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asr_run_sync(as, &ar); |
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if (ar.ar_errno) |
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errno = ar.ar_errno; |
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h_errno = ar.ar_h_errno; |
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if (ar.ar_h_errno != NETDB_SUCCESS) |
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return (-1); |
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len = anslen; |
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if (ar.ar_datalen < len) |
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len = ar.ar_datalen; |
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memmove(ans, ar.ar_data, len); |
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free(ar.ar_data); |
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return (ar.ar_datalen); |
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} |