/*
   passwd.c - NSS lookup functions for passwd 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 "prototypes.h"
#include "common.h"
#include "compat/attrs.h"

/* read a passwd entry from the stream */
static nss_status_t read_passwd(
        TFILE *fp,struct passwd *result,
        char *buffer,size_t buflen,int *errnop)
{
  int32_t tmpint32;
  size_t bufptr=0;
  READ_BUF_STRING(fp,result->pw_name);
  READ_BUF_STRING(fp,result->pw_passwd);
  READ_TYPE(fp,result->pw_uid,uid_t);
  READ_TYPE(fp,result->pw_gid,gid_t);
  READ_BUF_STRING(fp,result->pw_gecos);
  READ_BUF_STRING(fp,result->pw_dir);
  READ_BUF_STRING(fp,result->pw_shell);
  return NSS_STATUS_SUCCESS;
}

#ifdef NSS_FLAVOUR_GLIBC

/* get a single passwd entry by name */
nss_status_t _nss_ldap_getpwnam_r(
        const char *name,struct passwd *result,
        char *buffer,size_t buflen,int *errnop)
{
  NSS_BYNAME(NSLCD_ACTION_PASSWD_BYNAME,
             name,
             read_passwd(fp,result,buffer,buflen,errnop));
}

/* get a single passwd entry by uid */
nss_status_t _nss_ldap_getpwuid_r(
        uid_t uid,struct passwd *result,
        char *buffer,size_t buflen,int *errnop)
{
  NSS_BYTYPE(NSLCD_ACTION_PASSWD_BYUID,
             uid,uid_t,
             read_passwd(fp,result,buffer,buflen,errnop));
}

/* thread-local file pointer to an ongoing request */
static __thread TFILE *pwentfp;

/* open a connection to read all passwd entries */
nss_status_t _nss_ldap_setpwent(int UNUSED(stayopen))
{
  NSS_SETENT(pwentfp);
}

/* read password data from an opened stream */
nss_status_t _nss_ldap_getpwent_r(
        struct passwd *result,
        char *buffer,size_t buflen,int *errnop)
{
  NSS_GETENT(pwentfp,NSLCD_ACTION_PASSWD_ALL,
             read_passwd(pwentfp,result,buffer,buflen,errnop));
}

/* close the stream opened with setpwent() above */
nss_status_t _nss_ldap_endpwent(void)
{
  NSS_ENDENT(pwentfp);
}

#endif /* NSS_FLAVOUR_GLIBC */

#ifdef NSS_FLAVOUR_SOLARIS

#ifdef HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN

static nss_status_t read_passwdstring(TFILE *fp,nss_XbyY_args_t *args)
{
  struct passwd result;
  nss_status_t retv;
  char *buffer;
  size_t buflen;
  /* read the passwd */
  retv=read_passwd(fp,&result,NSS_ARGS(args)->buf.buffer,args->buf.buflen,&errno);
  if (retv!=NSS_STATUS_SUCCESS)
    return retv;
  /* allocate a temporary buffer */
  buflen=args->buf.buflen;
  buffer=(char *)malloc(buflen);
  /* build the formatted string */
  /* FIXME: implement proper buffer size checking */
   sprintf(buffer,"%s:%s:%d:%d:%s:%s:%s",
     result.pw_name,result.pw_passwd,(int)result.pw_uid,(int)result.pw_gid,result.pw_gecos,
     result.pw_dir,result.pw_shell);
  /* copy the result back to the result buffer and free the temporary one */
  strcpy(NSS_ARGS(args)->buf.buffer,buffer);
  free(buffer);
  NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.buffer;
  NSS_ARGS(args)->returnlen=strlen(NSS_ARGS(args)->buf.buffer);
  return NSS_STATUS_SUCCESS;
}

#define READ_RESULT(fp) \
  NSS_ARGS(args)->buf.result? \
    read_passwd(fp,(struct passwd *)NSS_ARGS(args)->buf.result,NSS_ARGS(args)->buf.buffer,NSS_ARGS(args)->buf.buflen,&errno): \
    read_passwdstring(fp,args); \
  if ((NSS_ARGS(args)->buf.result)&&(retv==NSS_STATUS_SUCCESS)) \
    NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.result;

#else /* not HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN */

#define READ_RESULT(fp) \
  read_passwd(fp,(struct passwd *)NSS_ARGS(args)->buf.result,NSS_ARGS(args)->buf.buffer,NSS_ARGS(args)->buf.buflen,&errno); \
  if (retv==NSS_STATUS_SUCCESS) \
    NSS_ARGS(args)->returnval=NSS_ARGS(args)->buf.result;

#endif /* not HAVE_STRUCT_NSS_XBYY_ARGS_RETURNLEN */

static nss_status_t passwd_getpwnam(nss_backend_t UNUSED(*be),void *args)
{
  NSS_BYNAME(NSLCD_ACTION_PASSWD_BYNAME,
             NSS_ARGS(args)->key.name,
             READ_RESULT(fp));
}

static nss_status_t passwd_getpwuid(nss_backend_t UNUSED(*be),void *args)
{
  NSS_BYTYPE(NSLCD_ACTION_PASSWD_BYUID,
             NSS_ARGS(args)->key.uid,uid_t,
             READ_RESULT(fp));
}

/* open a connection to the nslcd and write the request */
static nss_status_t passwd_setpwent(nss_backend_t *be,void UNUSED(*args))
{
  NSS_SETENT(LDAP_BE(be)->fp);
}

/* read password data from an opened stream */
static nss_status_t passwd_getpwent(nss_backend_t *be,void *args)
{
  NSS_GETENT(LDAP_BE(be)->fp,NSLCD_ACTION_PASSWD_ALL,
             READ_RESULT(LDAP_BE(be)->fp));
}

/* close the stream opened with setpwent() above */
static nss_status_t passwd_endpwent(nss_backend_t *be,void UNUSED(*args))
{
  NSS_ENDENT(LDAP_BE(be)->fp);
}

static nss_backend_op_t passwd_ops[]={
  nss_ldap_destructor,
  passwd_endpwent,
  passwd_setpwent,
  passwd_getpwent,
  passwd_getpwnam,
  passwd_getpwuid
};

nss_backend_t *_nss_ldap_passwd_constr(const char UNUSED(*db_name),
                  const char UNUSED(*src_name),const char UNUSED(*cfg_args))
{
  return nss_ldap_constructor(passwd_ops,sizeof(passwd_ops));
}

#endif /* NSS_FLAVOUR_SOLARIS */