/*
networks.c - NSS lookup functions for networks database
Copyright (C) 2006 West Consulting
Copyright (C) 2006-2015 Arthur de Jong
Copyright (C) 2010 Symas Corporation
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "prototypes.h"
#include "common.h"
#include "compat/attrs.h"
/* Redefine some ERROR_OUT macros as we also want to set h_errnop. */
#undef ERROR_OUT_OPENERROR
#define ERROR_OUT_OPENERROR \
*errnop = ENOENT; \
*h_errnop = HOST_NOT_FOUND; \
return (errno == EAGAIN) ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
#undef ERROR_OUT_READERROR
#define ERROR_OUT_READERROR(fp) \
(void)tio_close(fp); \
fp = NULL; \
*errnop = ENOENT; \
*h_errnop = NO_RECOVERY; \
return NSS_STATUS_UNAVAIL;
#undef ERROR_OUT_BUFERROR
#define ERROR_OUT_BUFERROR(fp) \
*errnop = ERANGE; \
*h_errnop = NETDB_INTERNAL; \
return NSS_STATUS_TRYAGAIN;
#undef ERROR_OUT_WRITEERROR
#define ERROR_OUT_WRITEERROR(fp) \
ERROR_OUT_READERROR(fp)
/* read a single network entry from the stream, ignoring entries
that are not AF_INET (IPv4), result is stored in result */
static nss_status_t read_netent(TFILE *fp, struct netent *result,
char *buffer, size_t buflen, int *errnop,
int *h_errnop)
{
int32_t tmpint32, tmp2int32, tmp3int32;
int32_t numaddr;
int readaf;
size_t bufptr = 0;
nss_status_t retv = NSS_STATUS_NOTFOUND;
memset(result, 0, sizeof(struct netent));
/* read the network entry */
READ_BUF_STRING(fp, result->n_name);
READ_BUF_STRINGLIST(fp, result->n_aliases);
result->n_addrtype = AF_INET;
/* read number of addresses to follow */
READ_INT32(fp, numaddr);
/* go through the address list and filter on af */
while (--numaddr >= 0)
{
/* read address family and size */
READ_INT32(fp, readaf);
READ_INT32(fp, tmp2int32); /* address length */
if ((readaf == AF_INET) && (tmp2int32 == 4))
{
/* read address and translate to host byte order */
READ_INT32(fp, result->n_net);
/* signal that we've read a proper entry */
retv = NSS_STATUS_SUCCESS;
/* don't return here to not upset the stream */
}
else
{
/* skip unsupported address families */
SKIP(fp, tmpint32);
}
}
return retv;
}
/* write an address value */
/* version 2.10 of glibc changed the address from network to host order
(changelog entry 2009-07-01) */
#define WRITE_ADDRESS(fp, addr) \
WRITE_INT32(fp, AF_INET); \
WRITE_INT32(fp, 4); \
WRITE_INT32(fp, addr);
#ifdef NSS_FLAVOUR_GLIBC
/* get a network entry by name */
nss_status_t NSS_NAME(getnetbyname_r)(const char *name,
struct netent *result, char *buffer,
size_t buflen, int *errnop,
int *h_errnop)
{
NSS_GETONE(NSLCD_ACTION_NETWORK_BYNAME,
WRITE_STRING(fp, name),
read_netent(fp, result, buffer, buflen, errnop, h_errnop));
}
/* Note: the af parameter is ignored and is assumed to be AF_INET */
/* TODO: implement handling of af parameter */
nss_status_t NSS_NAME(getnetbyaddr_r)(uint32_t addr, int UNUSED(af),
struct netent *result, char *buffer,
size_t buflen, int *errnop,
int *h_errnop)
{
NSS_GETONE(NSLCD_ACTION_NETWORK_BYADDR,
WRITE_ADDRESS(fp, addr),
read_netent(fp, result, buffer, buflen, errnop, h_errnop));
}
/* thread-local file pointer to an ongoing request */
static TLS TFILE *netentfp;
/* start a request to read all networks */
nss_status_t NSS_NAME(setnetent)(int UNUSED(stayopen))
{
NSS_SETENT(netentfp);
}
/* get a single network entry from the stream */
nss_status_t NSS_NAME(getnetent_r)(struct netent *result,
char *buffer, size_t buflen, int *errnop,
int *h_errnop)
{
NSS_GETENT(netentfp, NSLCD_ACTION_NETWORK_ALL,
read_netent(netentfp, result, buffer, buflen, errnop, h_errnop));
}
/* close the stream opened by setnetent() above */
nss_status_t NSS_NAME(endnetent)(void)
{
NSS_ENDENT(netentfp);
}
#endif /* NSS_FLAVOUR_GLIBC */
#ifdef NSS_FLAVOUR_SOLARIS
#ifdef HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN
static char *netent2str(struct netent *result, char *buffer, size_t buflen)
{
int i, res;
struct in_addr priv_in_addr;
priv_in_addr.s_addr = htonl(result->n_net);
res = snprintf(buffer, buflen, "%s %s", result->n_name, inet_ntoa(priv_in_addr));
if ((res < 0) || (res >= (int)buflen))
return NULL;
if (result->n_aliases)
for (i = 0; result->n_aliases[i]; i++)
{
strlcat(buffer, " ", buflen);
strlcat(buffer, result->n_aliases[i], buflen);
}
if (strlen(buffer) >= buflen - 1)
return NULL;
return buffer;
}
#endif /* HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN */
static nss_status_t read_result(TFILE *fp, nss_XbyY_args_t *args)
{
READ_RESULT(netent, &args->erange, &args->h_errno);
}
/* more of a dirty hack */
#define h_errnop (&(NSS_ARGS(args)->h_errno))
static nss_status_t networks_getnetbyname(nss_backend_t UNUSED(*be), void *args)
{
NSS_GETONE(NSLCD_ACTION_NETWORK_BYNAME,
WRITE_STRING(fp, NSS_ARGS(args)->key.name),
read_result(fp, args));
}
static nss_status_t networks_getnetbyaddr(nss_backend_t UNUSED(*be), void *args)
{
NSS_GETONE(NSLCD_ACTION_NETWORK_BYADDR,
WRITE_ADDRESS(fp, NSS_ARGS(args)->key.netaddr.net),
read_result(fp, args));
}
static nss_status_t networks_setnetent(nss_backend_t *be, void UNUSED(*args))
{
NSS_SETENT(LDAP_BE(be)->fp);
}
static nss_status_t networks_getnetent(nss_backend_t *be, void *args)
{
NSS_GETENT(LDAP_BE(be)->fp, NSLCD_ACTION_NETWORK_ALL,
read_result(LDAP_BE(be)->fp, args));
}
static nss_status_t networks_endnetent(nss_backend_t *be, void UNUSED(*args))
{
NSS_ENDENT(LDAP_BE(be)->fp);
}
static nss_backend_op_t networks_ops[] = {
nss_ldap_destructor,
networks_endnetent,
networks_setnetent,
networks_getnetent,
networks_getnetbyname,
networks_getnetbyaddr
};
nss_backend_t *NSS_NAME(networks_constr)(const char UNUSED(*db_name),
const char UNUSED(*src_name),
const char UNUSED(*cfg_args))
{
return nss_ldap_constructor(networks_ops, sizeof(networks_ops));
}
#endif /* NSS_FLAVOUR_SOLARIS */