/*      $NetBSD: nis_pw.c,v 1.1.1.2 2012/09/09 16:07:56 christos Exp $  */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996,1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: nis_pw.c,v 1.4 2005/04/27 04:56:33 sra Exp ";
#endif /* LIBC_SCCS and not lint */

/* Imports */

#include "port_before.h"

#if !defined(WANT_IRS_PW) || !defined(WANT_IRS_NIS)
static int __bind_irs_pw_unneeded;
#else

#include <sys/param.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <isc/memcluster.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>

#include <errno.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <isc/memcluster.h>

#include <irs.h>

#include "port_after.h"

#include "irs_p.h"
#include "nis_p.h"

/* Definitions */

struct pvt {
       int             needrewind;
       char *          nis_domain;
       char *          curkey_data;
       int             curkey_len;
       char *          curval_data;
       int             curval_len;
       struct passwd   passwd;
       char *          pwbuf;
};

enum do_what { do_none = 0x0, do_key = 0x1, do_val = 0x2, do_all = 0x3 };

static /*const*/ char passwd_byname[] = "passwd.byname";
static /*const*/ char passwd_byuid[] =  "passwd.byuid";

/* Forward */

static void                     pw_close(struct irs_pw *);
static struct passwd *          pw_next(struct irs_pw *);
static struct passwd *          pw_byname(struct irs_pw *, const char *);
static struct passwd *          pw_byuid(struct irs_pw *, uid_t);
static void                     pw_rewind(struct irs_pw *);
static void                     pw_minimize(struct irs_pw *);

static struct passwd *          makepasswdent(struct irs_pw *);
static void                     nisfree(struct pvt *, enum do_what);

/* Public */

struct irs_pw *
irs_nis_pw(struct irs_acc *this) {
       struct irs_pw *pw;
       struct pvt *pvt;

       if (!(pw = memget(sizeof *pw))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(pw, 0x5e, sizeof *pw);
       if (!(pvt = memget(sizeof *pvt))) {
               memput(pw, sizeof *pw);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       pvt->needrewind = 1;
       pvt->nis_domain = ((struct nis_p *)this->private)->domain;
       pw->private = pvt;
       pw->close = pw_close;
       pw->next = pw_next;
       pw->byname = pw_byname;
       pw->byuid = pw_byuid;
       pw->rewind = pw_rewind;
       pw->minimize = pw_minimize;
       pw->res_get = NULL;
       pw->res_set = NULL;
       return (pw);
}

/* Methods */

static void
pw_close(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       if (pvt->pwbuf)
               free(pvt->pwbuf);
       nisfree(pvt, do_all);
       memput(pvt, sizeof *pvt);
       memput(this, sizeof *this);
}

static struct passwd *
pw_next(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct passwd *rval;
       int r;

       do {
               if (pvt->needrewind) {
                       nisfree(pvt, do_all);
                       r = yp_first(pvt->nis_domain, passwd_byname,
                                    &pvt->curkey_data, &pvt->curkey_len,
                                    &pvt->curval_data, &pvt->curval_len);
                       pvt->needrewind = 0;
               } else {
                       char *newkey_data;
                       int newkey_len;

                       nisfree(pvt, do_val);
                       r = yp_next(pvt->nis_domain, passwd_byname,
                                   pvt->curkey_data, pvt->curkey_len,
                                   &newkey_data, &newkey_len,
                                   &pvt->curval_data, &pvt->curval_len);
                       nisfree(pvt, do_key);
                       pvt->curkey_data = newkey_data;
                       pvt->curkey_len = newkey_len;
               }
               if (r != 0) {
                       errno = ENOENT;
                       return (NULL);
               }
               rval = makepasswdent(this);
       } while (rval == NULL);
       return (rval);
}

static struct passwd *
pw_byname(struct irs_pw *this, const char *name) {
       struct pvt *pvt = (struct pvt *)this->private;
       int r;
       char *tmp;

       nisfree(pvt, do_val);
       DE_CONST(name, tmp);
       r = yp_match(pvt->nis_domain, passwd_byname, tmp, strlen(tmp),
                    &pvt->curval_data, &pvt->curval_len);
       if (r != 0) {
               errno = ENOENT;
               return (NULL);
       }
       return (makepasswdent(this));
}

static struct passwd *
pw_byuid(struct irs_pw *this, uid_t uid) {
       struct pvt *pvt = (struct pvt *)this->private;
       char tmp[sizeof "4294967295"];
       int r;

       nisfree(pvt, do_val);
       (void) sprintf(tmp, "%u", (unsigned int)uid);
       r = yp_match(pvt->nis_domain, passwd_byuid, tmp, strlen(tmp),
                    &pvt->curval_data, &pvt->curval_len);
       if (r != 0) {
               errno = ENOENT;
               return (NULL);
       }
       return (makepasswdent(this));
}

static void
pw_rewind(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

       pvt->needrewind = 1;
}

static void
pw_minimize(struct irs_pw *this) {
       UNUSED(this);
       /* NOOP */
}

/* Private */

static struct passwd *
makepasswdent(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       char *cp;

       memset(&pvt->passwd, 0, sizeof pvt->passwd);
       if (pvt->pwbuf)
               free(pvt->pwbuf);
       pvt->pwbuf = pvt->curval_data;
       pvt->curval_data = NULL;

       cp = pvt->pwbuf;
       pvt->passwd.pw_name = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
#ifdef HAS_PW_CLASS
       pvt->passwd.pw_class = cp;      /*%< Needs to point at a \0. */
#endif
       *cp++ = '\0';

       pvt->passwd.pw_passwd = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_uid = atoi(cp);
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_gid = atoi(cp);
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_gecos = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_dir = cp;
       if (!(cp = strchr(cp, ':')))
               goto cleanup;
       *cp++ = '\0';

       pvt->passwd.pw_shell = cp;

       if ((cp = strchr(cp, '\n')) != NULL)
               *cp = '\0';

       return (&pvt->passwd);

cleanup:
       free(pvt->pwbuf);
       pvt->pwbuf = NULL;
       return (NULL);
}

static void
nisfree(struct pvt *pvt, enum do_what do_what) {
       if ((do_what & do_key) && pvt->curkey_data) {
               free(pvt->curkey_data);
               pvt->curkey_data = NULL;
       }
       if ((do_what & do_val) && pvt->curval_data) {
               free(pvt->curval_data);
               pvt->curval_data = NULL;
       }
}

#endif /* WANT_IRS_PW && WANT_IRS_NIS */
/*! \file */

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