452 lines
10 KiB
C
452 lines
10 KiB
C
/*-
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* Copyright (c) 1994, Garrett Wollman
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include "reentrant.h"
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <nsswitch.h>
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#include "un-namespace.h"
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#include "netdb_private.h"
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#ifdef NS_CACHING
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#include "nscache.h"
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#endif
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/* Network lookup order if nsswitch.conf is broken or nonexistent */
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static const ns_src default_src[] = {
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{ NSSRC_FILES, NS_SUCCESS },
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{ NSSRC_DNS, NS_SUCCESS },
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{ 0 }
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};
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NETDB_THREAD_ALLOC(netent_data)
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NETDB_THREAD_ALLOC(netdata)
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#ifdef NS_CACHING
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static int
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net_id_func(char *buffer, size_t *buffer_size, va_list ap, void *cache_mdata)
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{
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char *name;
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uint32_t net;
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int type;
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size_t desired_size, size;
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enum nss_lookup_type lookup_type;
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int res = NS_UNAVAIL;
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lookup_type = (enum nss_lookup_type)cache_mdata;
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switch (lookup_type) {
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case nss_lt_name:
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name = va_arg(ap, char *);
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size = strlen(name);
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desired_size = sizeof(enum nss_lookup_type) + size + 1;
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if (desired_size > *buffer_size) {
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res = NS_RETURN;
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goto fin;
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}
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memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
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memcpy(buffer + sizeof(enum nss_lookup_type), name, size + 1);
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res = NS_SUCCESS;
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break;
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case nss_lt_id:
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net = va_arg(ap, uint32_t);
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type = va_arg(ap, int);
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desired_size = sizeof(enum nss_lookup_type) +
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sizeof(uint32_t) + sizeof(int);
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if (desired_size > *buffer_size) {
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res = NS_RETURN;
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goto fin;
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}
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memcpy(buffer, &lookup_type, sizeof(enum nss_lookup_type));
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memcpy(buffer + sizeof(enum nss_lookup_type), &net,
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sizeof(uint32_t));
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memcpy(buffer + sizeof(enum nss_lookup_type) + sizeof(uint32_t),
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&type, sizeof(int));
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res = NS_SUCCESS;
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break;
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default:
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/* should be unreachable */
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return (NS_UNAVAIL);
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}
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fin:
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*buffer_size = desired_size;
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return (res);
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}
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static int
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net_marshal_func(char *buffer, size_t *buffer_size, void *retval, va_list ap,
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void *cache_mdata)
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{
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char *name;
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uint32_t net;
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int type;
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struct netent *ne;
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char *orig_buf;
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size_t orig_buf_size;
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struct netent new_ne;
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size_t desired_size, size, aliases_size;
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char *p;
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char **alias;
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switch ((enum nss_lookup_type)cache_mdata) {
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case nss_lt_name:
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name = va_arg(ap, char *);
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break;
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case nss_lt_id:
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net = va_arg(ap, uint32_t);
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type = va_arg(ap, int);
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break;
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case nss_lt_all:
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break;
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default:
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/* should be unreachable */
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return (NS_UNAVAIL);
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}
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ne = va_arg(ap, struct netent *);
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orig_buf = va_arg(ap, char *);
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orig_buf_size = va_arg(ap, size_t);
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desired_size = _ALIGNBYTES + sizeof(struct netent) + sizeof(char *);
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if (ne->n_name != NULL)
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desired_size += strlen(ne->n_name) + 1;
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if (ne->n_aliases != NULL) {
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aliases_size = 0;
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for (alias = ne->n_aliases; *alias; ++alias) {
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desired_size += strlen(*alias) + 1;
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++aliases_size;
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}
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desired_size += _ALIGNBYTES +
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(aliases_size + 1) * sizeof(char *);
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}
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if (*buffer_size < desired_size) {
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/* this assignment is here for future use */
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*buffer_size = desired_size;
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return (NS_RETURN);
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}
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memcpy(&new_ne, ne, sizeof(struct netent));
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*buffer_size = desired_size;
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memset(buffer, 0, desired_size);
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p = buffer + sizeof(struct netent) + sizeof(char *);
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memcpy(buffer + sizeof(struct netent), &p, sizeof(char *));
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p = (char *)_ALIGN(p);
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if (new_ne.n_name != NULL) {
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size = strlen(new_ne.n_name);
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memcpy(p, new_ne.n_name, size);
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new_ne.n_name = p;
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p += size + 1;
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}
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if (new_ne.n_aliases != NULL) {
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p = (char *)_ALIGN(p);
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memcpy(p, new_ne.n_aliases, sizeof(char *) * aliases_size);
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new_ne.n_aliases = (char **)p;
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p += sizeof(char *) * (aliases_size + 1);
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for (alias = new_ne.n_aliases; *alias; ++alias) {
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size = strlen(*alias);
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memcpy(p, *alias, size);
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*alias = p;
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p += size + 1;
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}
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}
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memcpy(buffer, &new_ne, sizeof(struct netent));
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return (NS_SUCCESS);
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}
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static int
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net_unmarshal_func(char *buffer, size_t buffer_size, void *retval, va_list ap,
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void *cache_mdata)
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{
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char *name;
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uint32_t net;
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int type;
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struct netent *ne;
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char *orig_buf;
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size_t orig_buf_size;
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int *ret_errno;
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char *p;
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char **alias;
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switch ((enum nss_lookup_type)cache_mdata) {
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case nss_lt_name:
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name = va_arg(ap, char *);
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break;
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case nss_lt_id:
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net = va_arg(ap, uint32_t);
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type = va_arg(ap, int);
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break;
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case nss_lt_all:
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break;
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default:
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/* should be unreachable */
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return (NS_UNAVAIL);
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}
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ne = va_arg(ap, struct netent *);
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orig_buf = va_arg(ap, char *);
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orig_buf_size = va_arg(ap, size_t);
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ret_errno = va_arg(ap, int *);
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if (orig_buf_size <
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buffer_size - sizeof(struct netent) - sizeof(char *)) {
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*ret_errno = ERANGE;
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return (NS_RETURN);
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}
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memcpy(ne, buffer, sizeof(struct netent));
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memcpy(&p, buffer + sizeof(struct netent), sizeof(char *));
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orig_buf = (char *)_ALIGN(orig_buf);
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memcpy(orig_buf, buffer + sizeof(struct netent) + sizeof(char *) +
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_ALIGN(p) - (size_t)p,
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buffer_size - sizeof(struct netent) - sizeof(char *) -
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_ALIGN(p) + (size_t)p);
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p = (char *)_ALIGN(p);
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NS_APPLY_OFFSET(ne->n_name, orig_buf, p, char *);
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if (ne->n_aliases != NULL) {
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NS_APPLY_OFFSET(ne->n_aliases, orig_buf, p, char **);
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for (alias = ne->n_aliases; *alias; ++alias)
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NS_APPLY_OFFSET(*alias, orig_buf, p, char *);
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}
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if (retval != NULL)
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*((struct netent **)retval) = ne;
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return (NS_SUCCESS);
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}
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#endif /* NS_CACHING */
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static void
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netent_data_free(void *ptr)
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{
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struct netent_data *ned = ptr;
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if (ned == NULL)
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return;
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ned->stayopen = 0;
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_endnethtent(ned);
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free(ned);
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}
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static void
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netdata_free(void *ptr)
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{
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free(ptr);
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}
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int
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__copy_netent(struct netent *ne, struct netent *nptr, char *buf, size_t buflen)
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{
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char *cp;
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int i, n;
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int numptr, len;
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/* Find out the amount of space required to store the answer. */
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numptr = 1; /* NULL ptr */
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len = (char *)ALIGN(buf) - buf;
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for (i = 0; ne->n_aliases[i]; i++, numptr++) {
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len += strlen(ne->n_aliases[i]) + 1;
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}
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len += strlen(ne->n_name) + 1;
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len += numptr * sizeof(char*);
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if (len > (int)buflen) {
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errno = ERANGE;
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return (-1);
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}
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/* copy net value and type */
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nptr->n_addrtype = ne->n_addrtype;
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nptr->n_net = ne->n_net;
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cp = (char *)ALIGN(buf) + numptr * sizeof(char *);
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/* copy official name */
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n = strlen(ne->n_name) + 1;
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strcpy(cp, ne->n_name);
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nptr->n_name = cp;
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cp += n;
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/* copy aliases */
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nptr->n_aliases = (char **)ALIGN(buf);
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for (i = 0 ; ne->n_aliases[i]; i++) {
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n = strlen(ne->n_aliases[i]) + 1;
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strcpy(cp, ne->n_aliases[i]);
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nptr->n_aliases[i] = cp;
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cp += n;
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}
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nptr->n_aliases[i] = NULL;
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return (0);
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}
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int
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getnetbyname_r(const char *name, struct netent *ne, char *buffer,
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size_t buflen, struct netent **result, int *h_errorp)
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{
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#ifdef NS_CACHING
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static const nss_cache_info cache_info =
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NS_COMMON_CACHE_INFO_INITIALIZER(
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networks, (void *)nss_lt_name,
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net_id_func, net_marshal_func, net_unmarshal_func);
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#endif
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_ht_getnetbyname, NULL)
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{ NSSRC_DNS, _dns_getnetbyname, NULL },
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NS_NIS_CB(_nis_getnetbyname, NULL) /* force -DHESIOD */
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#ifdef NS_CACHING
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NS_CACHE_CB(&cache_info)
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#endif
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{ 0 }
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};
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int rval, ret_errno = 0;
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rval = _nsdispatch((void *)result, dtab, NSDB_NETWORKS,
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"getnetbyname_r", default_src, name, ne, buffer, buflen,
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&ret_errno, h_errorp);
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if (rval != NS_SUCCESS) {
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errno = ret_errno;
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return ((ret_errno != 0) ? ret_errno : -1);
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}
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return (0);
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}
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int
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getnetbyaddr_r(uint32_t addr, int af, struct netent *ne, char *buffer,
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size_t buflen, struct netent **result, int *h_errorp)
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{
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#ifdef NS_CACHING
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static const nss_cache_info cache_info =
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NS_COMMON_CACHE_INFO_INITIALIZER(
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networks, (void *)nss_lt_id,
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net_id_func, net_marshal_func, net_unmarshal_func);
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#endif
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static const ns_dtab dtab[] = {
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NS_FILES_CB(_ht_getnetbyaddr, NULL)
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{ NSSRC_DNS, _dns_getnetbyaddr, NULL },
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NS_NIS_CB(_nis_getnetbyaddr, NULL) /* force -DHESIOD */
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#ifdef NS_CACHING
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NS_CACHE_CB(&cache_info)
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#endif
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{ 0 }
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};
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int rval, ret_errno = 0;
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rval = _nsdispatch((void *)result, dtab, NSDB_NETWORKS,
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"getnetbyaddr_r", default_src, addr, af, ne, buffer, buflen,
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&ret_errno, h_errorp);
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if (rval != NS_SUCCESS) {
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errno = ret_errno;
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return ((ret_errno != 0) ? ret_errno : -1);
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}
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return (0);
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}
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struct netent *
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getnetbyname(const char *name)
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{
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struct netdata *nd;
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struct netent *rval;
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int ret_h_errno;
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if ((nd = __netdata_init()) == NULL)
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return (NULL);
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if (getnetbyname_r(name, &nd->net, nd->data, sizeof(nd->data), &rval,
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&ret_h_errno) != 0)
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return (NULL);
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return (rval);
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}
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struct netent *
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getnetbyaddr(uint32_t addr, int af)
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{
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struct netdata *nd;
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struct netent *rval;
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int ret_h_errno;
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if ((nd = __netdata_init()) == NULL)
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return (NULL);
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if (getnetbyaddr_r(addr, af, &nd->net, nd->data, sizeof(nd->data),
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&rval, &ret_h_errno) != 0)
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return (NULL);
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return (rval);
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}
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void
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setnetent(int stayopen)
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{
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struct netent_data *ned;
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if ((ned = __netent_data_init()) == NULL)
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return;
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_setnethtent(stayopen, ned);
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_setnetdnsent(stayopen);
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}
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void
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endnetent(void)
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{
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struct netent_data *ned;
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if ((ned = __netent_data_init()) == NULL)
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return;
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_endnethtent(ned);
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_endnetdnsent();
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}
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