diff options
Diffstat (limited to 'mit-pthreads/net/gethostbyaddr.c')
| -rw-r--r-- | mit-pthreads/net/gethostbyaddr.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/mit-pthreads/net/gethostbyaddr.c b/mit-pthreads/net/gethostbyaddr.c new file mode 100644 index 00000000000..f80e47ffd99 --- /dev/null +++ b/mit-pthreads/net/gethostbyaddr.c @@ -0,0 +1,161 @@ +/* + * 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: @(#)gethostbyaddr.c 6.45 (Berkeley) 2/24/91";*/ +static char *rcsid = "$Id$"; +#endif /* LIBC_SCCS and not lint */ + + +#include <pthread.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <netdb.h> +#include <netinet/in.h> +#include <resolv.h> +#include <netinet/in.h> +#include <errno.h> +#include <sys/socket.h> +#include "res_internal.h" + +static struct hostent *file_find_addr(const char *addr, int len, int type, + struct hostent *result, char *buf, + int bufsize, int *errval); + +struct hostent *gethostbyaddr(const char *addr, int len, int type) +{ + struct res_data *data = _res_init(); + + if (!data) + return NULL; + if (!data->buf) { + data->buf = malloc(sizeof(struct hostent) + HOST_BUFSIZE); + if (!data->buf) { + errno = 0; + data->errval = NO_RECOVERY; + return NULL; + } + } + return gethostbyaddr_r(addr, len, type, (struct hostent *) data->buf, + data->buf + sizeof(struct hostent), HOST_BUFSIZE, + &data->errval); +} + +struct hostent *gethostbyaddr_r(const char *addr, int len, int type, + struct hostent *result, char *buf, int bufsize, + int *errval) +{ + struct res_data *data; + querybuf qbuf; + char lookups[MAXDNSLUS], addrbuf[MAXDNAME], *abuf; + struct hostent *hp; + int n, i; + + /* Default failure condition is not a range error and not recoverable. */ + errno = 0; + *errval = NO_RECOVERY; + + data = _res_init(); + if (!data) + return NULL; + + if (type != AF_INET) + return NULL; + sprintf(addrbuf, "%u.%u.%u.%u.in-addr.arpa", + (unsigned)addr[3] & 0xff, (unsigned)addr[2] & 0xff, + (unsigned)addr[1] & 0xff, (unsigned)addr[0] & 0xff); + + memcpy(lookups, data->state.lookups, sizeof(lookups)); + if (*lookups == 0) + strncpy(lookups, "bf", sizeof(lookups)); + + hp = NULL; + for (i = 0; i < MAXDNSLUS && hp == NULL && lookups[i]; i++) { + switch (lookups[i]) { + case 'b': + + /* Allocate space for a one-item list of addresses. */ + abuf = SP(SP(buf, char *, 2), struct in_addr, 1); + if (abuf > buf + bufsize) { + errno = ERANGE; + return NULL; + } + + /* Perform and parse the query. */ + n = res_query(addrbuf, C_IN, T_PTR, (char *)&qbuf, sizeof(qbuf)); + if (n < 0) + break; + hp = _res_parse_answer(&qbuf, n, 1, result, abuf, + bufsize - (abuf - buf), errval); + if (hp == NULL) + break; + + /* Fill in our own address list. */ + result->h_addrtype = type; + result->h_length = len; + result->h_addr_list = (char **) ALIGN(buf, char *); + result->h_addr_list[0] = ALIGN(&result->h_addr_list[2], + struct in_addr); + result->h_addr_list[1] = NULL; + break; + + case 'f': + hp = file_find_addr(addr, len, type, result, buf, bufsize, errval); + break; + } + } + + return hp; +} + +static struct hostent *file_find_addr(const char *addr, int len, int type, + struct hostent *result, char *buf, + int bufsize, int *errval) +{ + FILE *fp = NULL; + + pthread_mutex_lock(&host_iterate_lock); + sethostent(0); + while ((result = gethostent_r(result, buf, bufsize, errval)) != NULL) { + /* Check the entry against the given address. */ + if (result->h_addrtype == type && + memcmp(result->h_addr, addr, len) == 0) + break; + } + pthread_mutex_unlock(&host_iterate_lock); + if (!result && errno != ERANGE) + *errval = HOST_NOT_FOUND; + return result; +} + |