diff options
Diffstat (limited to 'lib/libpthread/net/res_search.c')
| -rw-r--r-- | lib/libpthread/net/res_search.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/lib/libpthread/net/res_search.c b/lib/libpthread/net/res_search.c deleted file mode 100644 index 64cddea20d4..00000000000 --- a/lib/libpthread/net/res_search.c +++ /dev/null @@ -1,168 +0,0 @@ -/* - * Copyright (c) 1985, 1988 Regents of the University of California. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#if defined(LIBC_SCCS) && !defined(lint) -/*static char *sccsid = "from: @(#)res_search.c 6.45 (Berkeley) 2/24/91";*/ -static char *rcsid = "$Id: res_search.c,v 1.1 1998/07/21 13:19:47 peter Exp $"; -#endif /* LIBC_SCCS and not lint */ - -#include <pthread.h> -#include <string.h> -#include <stdio.h> -#include <stdlib.h> -#include <resolv.h> -#include <netdb.h> -#include "res_internal.h" - -static char *search_aliases(const char *name, char *buf, int bufsize); - -int res_search(const char *name, int class, int type, unsigned char *answer, - int anslen) -{ - struct res_data *data; - const char *p; - int num_dots, len, result, no_data = 0, error; - char buf[2 * MAXDNAME + 2], *domain, **dptr, *alias; - - data = _res_init(); - if (!data) - return -1; - - /* Count the dots in name, and get a pointer to the end of name. */ - num_dots = 0; - for (p = name; *p; p++) { - if (*p == '.') - num_dots++; - } - len = p - name; - - /* If there aren't any dots, check to see if name is an alias for - * another host. If so, try the resolved alias as a fully-qualified - * name. */ - alias = search_aliases(name, buf, sizeof(buf)); - if (alias != NULL) - return res_query(alias, class, type, answer, anslen); - - /* If there's a trailing dot, try to strip it off and query the name. */ - if (len > 0 && p[-1] == '.') { - if (len > sizeof(buf)) { - /* It's too long; just query the original name. */ - return res_query(name, class, type, answer, anslen); - } else { - /* Copy the name without the trailing dot and query. */ - memcpy(buf, name, len - 1); - buf[len] = 0; - return res_query(buf, class, type, answer, anslen); - } - } - - if (data->state.options & RES_DNSRCH) { - /* If RES_DNSRCH is set, query all the domains until we get a - * definitive answer. */ - for (dptr = data->state.dnsrch; *dptr; dptr++) { - domain = *dptr; - sprintf(buf, "%.*s.%.*s", MAXDNAME, name, MAXDNAME, domain); - result = res_query(buf, class, type, answer, anslen); - if (result > 0) - return result; - if (data->errval == NO_DATA) - no_data = 1; - else if (data->errval != HOST_NOT_FOUND) - break; - } - } else if (num_dots == 0 && data->state.options & RES_DEFNAMES) { - /* If RES_DEFNAMES is set and there is no dot, query the default - * domain. */ - domain = data->state.defdname; - sprintf(buf, "%.*s.%.%s", MAXDNAME, name, MAXDNAME, domain); - result = res_query(buf, class, type, answer, anslen); - if (result > 0) - return result; - if (data->errval == NO_DATA) - no_data = 1; - } - - /* If all the domain queries failed, try the name as fully-qualified. - * Only do this if there is at least one dot in the name. */ - if (num_dots > 0) { - result = res_query(name, class, type, answer, anslen); - if (result > 0) - return result; - } - - if (no_data) - data->errval = NO_DATA; - - return -1; -} - -static char *search_aliases(const char *name, char *buf, int bufsize) -{ - FILE *fp; - char *filename, *p; - int len; - - filename = getenv("HOSTALIASES"); - if (filename == NULL) - return NULL; - - fp = fopen(filename, "r"); - if (fp == NULL) - return NULL; - - len = strlen(name); - while (fgets(buf, bufsize, fp)) { - - /* Get the first word from the buffer. */ - p = buf; - while (*p && !isspace(*p)) - p++; - if (!*p) - break; - - /* Null-terminate the first word and compare it with the name. */ - *p = 0; - if (strcasecmp(buf, name) != 0) - continue; - - p++; - while (isspace(*p)) - p++; - fclose(fp); - return (*p) ? p : NULL; - } - - fclose(fp); - return NULL; -} - |