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/*
networks.c - NSS lookup functions for networks database
Copyright (C) 2006 West Consulting
Copyright (C) 2006, 2007, 2008, 2010 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) \
(void)tio_close(fp); \
fp=NULL; \
*errnop=ERANGE; \
*h_errnop=TRY_AGAIN; \
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,i;
int readaf;
size_t bufptr=0;
nss_status_t retv=NSS_STATUS_NOTFOUND;
/* 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_TYPE(fp,numaddr,int32_t);
/* go through the address list and filter on af */
i=0;
while (--numaddr>=0)
{
/* read address family and size */
READ_INT32(fp,readaf);
READ_INT32(fp,tmp2int32);
if ((readaf==AF_INET)&&(tmp2int32==4))
{
/* read address and translate to host byte order */
READ_TYPE(fp,tmpint32,int32_t);
result->n_net=ntohl((uint32_t)tmpint32);
/* 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,htonl(addr));
#ifdef NSS_FLAVOUR_GLIBC
/* get a network entry by name */
nss_status_t _nss_ldap_getnetbyname_r(
const char *name,struct netent *result,
char *buffer,size_t buflen,int *errnop,int *h_errnop)
{
NSS_BYNAME(NSLCD_ACTION_NETWORK_BYNAME,buffer,buflen,
name,
read_netent(fp,result,buffer,buflen,errnop,h_errnop));
return retv;
}
/* Note: the af parameter is ignored and is assumed to be AF_INET */
/* TODO: implement handling of af parameter */
nss_status_t _nss_ldap_getnetbyaddr_r(
uint32_t addr,int UNUSED(af),struct netent *result,
char *buffer,size_t buflen,int *errnop,int *h_errnop)
{
NSS_BYGEN(NSLCD_ACTION_NETWORK_BYADDR,buffer,buflen,
WRITE_ADDRESS(fp,addr),
read_netent(fp,result,buffer,buflen,errnop,h_errnop))
return retv;
}
/* thread-local file pointer to an ongoing request */
static __thread TFILE *netentfp;
/* start a request to read all networks */
nss_status_t _nss_ldap_setnetent(int UNUSED(stayopen))
{
NSS_SETENT(netentfp);
}
/* get a single network entry from the stream */
nss_status_t _nss_ldap_getnetent_r(
struct netent *result,
char *buffer,size_t buflen,int *errnop,int *h_errnop)
{
NSS_GETENT(netentfp,NSLCD_ACTION_NETWORK_ALL,buffer,buflen,
read_netent(netentfp,result,buffer,buflen,errnop,h_errnop));
return retv;
}
/* close the stream opened by setnetent() above */
nss_status_t _nss_ldap_endnetent(void)
{
NSS_ENDENT(netentfp);
}
#endif /* NSS_FLAVOUR_GLIBC */
#ifdef NSS_FLAVOUR_SOLARIS
static nss_status_t _nss_nslcd_getnetbyname_r(
const char *name,struct netent *result,char *buffer,
size_t buflen,int *errnop,int *h_errnop)
{
NSS_BYNAME(NSLCD_ACTION_NETWORK_BYNAME,buffer,buflen,
name,
read_netent(fp,result,buffer,buflen,errnop,h_errnop));
return retv;
}
static nss_status_t _xnss_ldap_getnetbyname_r(nss_backend_t UNUSED(*be),void *args)
{
struct netent priv_network;
struct netent *network=NSS_ARGS(args)->buf.result?(struct netent *)NSS_ARGS(args)->buf.result:&priv_network;
char *name=(char *)NSS_ARGS(args)->key.name;
int af=NSS_ARGS(args)->key.netaddr.type;
char *buffer=NSS_ARGS(args)->buf.buffer;
size_t buflen=NSS_ARGS(args)->buf.buflen;
int h_errno;
char *data_ptr;
nss_status_t status;
if (NSS_ARGS(args)->buf.buflen<0)
{
NSS_ARGS(args)->erange=1;
return NSS_STATUS_TRYAGAIN;
}
status=_nss_nslcd_getnetbyname_r(name,network,buffer,
buflen,&errno,&h_errno);
if (status!=NSS_STATUS_SUCCESS)
{
NSS_ARGS(args)->h_errno=h_errno;
return status;
}
if (!NSS_ARGS(args)->buf.result)
{
/* result==NULL, return file format */
struct in_addr priv_in_addr;
priv_in_addr.s_addr = network->n_net;
data_ptr=(char *)malloc(buflen);
sprintf(data_ptr,"%s %s",name,inet_ntoa(priv_in_addr)); /* ipNetworkNumber */
if (network->n_aliases)
{
int i;
for (i=0; network->n_aliases[i]; i++)
{
strcat(data_ptr," ");
strcat(data_ptr,network->n_aliases[i]);
}
}
strcpy(buffer,data_ptr);
free(data_ptr);
NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.buffer;
NSS_ARGS(args)->returnlen=strlen(NSS_ARGS(args)->buf.buffer);
}
else
{
NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.result;
}
NSS_ARGS(args)->h_errno=h_errno;
return status;
}
/* Note: the af parameter is ignored and is assumed to be AF_INET */
/* TODO: implement handling of af parameter */
static nss_status_t _nss_nslcd_getnetbyaddr_r(
uint32_t addr,int UNUSED(af),struct netent *result,
char *buffer,size_t buflen,int *errnop,int *h_errnop)
{
NSS_BYGEN(NSLCD_ACTION_NETWORK_BYADDR,buffer,buflen,
WRITE_ADDRESS(fp,addr),
read_netent(fp,result,buffer,buflen,errnop,h_errnop))
return retv;
}
/* Note: the af parameter is ignored and is assumed to be AF_INET */
/* TODO: implement handling of af parameter */
static nss_status_t _xnss_ldap_getnetbyaddr_r(nss_backend_t UNUSED(*be),void *args)
{
struct netent priv_network;
struct netent *network=NSS_ARGS(args)->buf.result?(struct netent *)NSS_ARGS(args)->buf.result:&priv_network;
int addr=NSS_ARGS(args)->key.netaddr.net; /* is an addr an int? */
int af=NSS_ARGS(args)->key.netaddr.type;
char *buffer=NSS_ARGS(args)->buf.buffer;
size_t buflen=NSS_ARGS(args)->buf.buflen;
int h_errno;
char *data_ptr;
struct in_addr in_addr;
nss_status_t status;
if (NSS_ARGS(args)->buf.buflen<0)
{
NSS_ARGS(args)->erange=1;
return NSS_STATUS_TRYAGAIN;
}
status=_nss_nslcd_getnetbyaddr_r(addr,af,network,buffer,buflen,&errno,&h_errno);
if (status!=NSS_STATUS_SUCCESS)
{
NSS_ARGS(args)->h_errno=h_errno;
return status;
}
if (!NSS_ARGS(args)->buf.result)
{
/* result==NULL, return file format */
(void)memcpy(&in_addr.s_addr,addr,sizeof(in_addr.s_addr));
data_ptr=(char *)malloc(buflen);
sprintf(data_ptr,"%s %s",network->n_name,
inet_ntoa(in_addr)); /* ipNetworkNumber */
if (network->n_aliases)
{
int i;
for (i=0; network->n_aliases[i]; i++)
{
strcat(data_ptr," ");
strcat(data_ptr,network->n_aliases[i]);
}
}
strcpy(buffer,data_ptr);
free(data_ptr);
NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.buffer;
NSS_ARGS(args)->returnlen=strlen(NSS_ARGS(args)->buf.buffer);
}
else
{
NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.result;
}
NSS_ARGS(args)->h_errno=h_errno;
return status;
}
/* thread-local file pointer to an ongoing request */
static __thread TFILE *netentfp;
static nss_status_t _xnss_ldap_setnetent(nss_backend_t UNUSED(*be),void UNUSED(*args))
{
NSS_SETENT(netentfp);
}
static nss_status_t _nss_nslcd_getnetent_r(
struct netent *result,char *buffer,size_t buflen,
int *errnop,int *h_errnop)
{
NSS_GETENT(netentfp,NSLCD_ACTION_NETWORK_ALL,buffer,buflen,
read_netent(netentfp,result,buffer,buflen,errnop,h_errnop));
return retv;
}
static nss_status_t _xnss_ldap_getnetent_r(nss_backend_t UNUSED(*be),void *args)
{
struct netent priv_network;
struct netent *network=NSS_ARGS(args)->buf.result?(struct netent *)NSS_ARGS(args)->buf.result:&priv_network;
char *buffer=NSS_ARGS(args)->buf.buffer;
size_t buflen=NSS_ARGS(args)->buf.buflen;
int h_errno;
char *data_ptr;
nss_status_t status;
if (NSS_ARGS(args)->buf.buflen<0)
{
NSS_ARGS(args)->erange=1;
return NSS_STATUS_TRYAGAIN;
}
status=_nss_nslcd_getnetent_r(network,buffer,buflen,&errno,&h_errno);
if (status!=NSS_STATUS_SUCCESS)
return status;
if (!NSS_ARGS(args)->buf.result)
{
/* result==NULL, return file format */
struct in_addr priv_in_addr;
priv_in_addr.s_addr = network->n_net;
data_ptr=(char *)malloc(buflen);
sprintf(data_ptr,"%s %s",network->n_name,
inet_ntoa(priv_in_addr)); /* ipNetworkNumber */
if (network->n_aliases)
{
int i;
for (i=0; network->n_aliases[i]; i++)
{
strcat(data_ptr," ");
strcat(data_ptr,network->n_aliases[i]);
}
}
strcpy(buffer,data_ptr);
free(data_ptr);
NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.buffer;
NSS_ARGS(args)->returnlen=strlen(NSS_ARGS(args)->buf.buffer);
}
else
{
NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.result;
}
NSS_ARGS(args)->h_errno=h_errno;
return status;
}
static nss_status_t _xnss_ldap_endnetent(nss_backend_t UNUSED(*be),void UNUSED(*args))
{
NSS_ENDENT(netentfp);
}
static nss_status_t _xnss_ldap_networks_destr(nss_backend_t *be,void UNUSED(*args))
{
free(be);
return NSS_STATUS_SUCCESS;
}
static nss_backend_op_t net_ops[]={
_xnss_ldap_networks_destr,
_xnss_ldap_endnetent,
_xnss_ldap_setnetent,
_xnss_ldap_getnetent_r,
_xnss_ldap_getnetbyname_r,
_xnss_ldap_getnetbyaddr_r
};
nss_backend_t *_nss_ldap_networks_constr(const char UNUSED(*db_name),
const char UNUSED(*src_name),const char UNUSED(*cfg_args))
{
nss_backend_t *be;
if (!(be=(nss_backend_t *)malloc(sizeof(*be))))
return NULL;
be->ops=net_ops;
be->n_ops=sizeof(net_ops)/sizeof(nss_backend_op_t);
return (nss_backend_t *)be;
}
#endif /* NSS_FLAVOUR_SOLARIS */
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