/*      $NetBSD: yppasswdd_mkpw.c,v 1.18 2011/08/30 17:06:22 plunky Exp $       */

/*
 * Copyright (c) 1996 Jason R. Thorpe <thorpej@NetBSD.org>
 * All rights reserved.
 *
 * Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: yppasswdd_mkpw.c,v 1.18 2011/08/30 17:06:22 plunky Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/wait.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <pwd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <limits.h>

#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <rpcsvc/yppasswd.h>

#include "extern.h"

int     handling_request;               /* simple mutex */

void
make_passwd(yppasswd *argp, struct svc_req *rqstp, SVCXPRT *transp)
{
        struct passwd pw;
        int pfd, tfd;
        char mpwd[MAXPATHLEN];
        char buf[8192]; /* from libutil */
        char *p;
        int lineno;
        FILE *fpw;

#define REPLY(val)      do { \
                int res = (val); \
                if (!svc_sendreply(transp, (xdrproc_t)xdr_int, (caddr_t)&res)) \
                        svcerr_systemerr(transp); \
        } while (0)

#define RETURN(val)     do { \
                REPLY((val)); \
                handling_request = 0; \
                return; \
        } while (0)

        if (handling_request) {
                warnx("already handling request; try again later");
                REPLY(1);
                return;
        }
        handling_request = 1;

        (void)strlcpy(mpwd, pw_getprefix(), sizeof(mpwd));
        (void)strlcat(mpwd, _PATH_MASTERPASSWD, sizeof(mpwd));
        fpw = fopen(mpwd, "r");
        if (fpw == NULL) {
                warnx("%s", mpwd);
                RETURN(1);
        }
        for(lineno = 1; ; lineno++) {
                if (fgets(buf, sizeof(buf), fpw) == NULL) {
                        if (feof(fpw))
                                warnx("%s: %s not found", mpwd,
                                    argp->newpw.pw_name);
                        else
                                warnx("%s: %s", mpwd, strerror(errno));
                        (void)fclose(fpw);
                        RETURN(1);
                }
                if ((p = strchr(buf, '\n')) == NULL) {
                        warnx("line %d too long", lineno);
                        (void)fclose(fpw);
                        RETURN(1);
                }
                /* get rid of trailing \n */
                *p = '\0';
                if (pw_scan(buf, &pw, NULL) == 0)
                        continue;
                if (strncmp(argp->newpw.pw_name, pw.pw_name, MAXLOGNAME) == 0)
                        break;
        }
        fclose(fpw);
        if (*pw.pw_passwd &&
            strcmp(crypt(argp->oldpass, pw.pw_passwd), pw.pw_passwd) != 0)
                RETURN(1);

        pw_init();
        tfd = pw_lock(0);
        if (tfd < 0) {
                warnx("the passwd file is busy.");
                RETURN(1);
        }
        pfd = open(mpwd, O_RDONLY, 0);
        if (pfd < 0) {
                pw_abort();
                warnx("%s", mpwd);
                RETURN(1);
        }

        /*
         * Get the new password.  Reset passwd change time to zero; when
         * classes are implemented, go and get the "offset" value for this
         * class and reset the timer.
         */
        if (!nopw) {
                pw.pw_passwd = argp->newpw.pw_passwd;
                pw.pw_change = 0;
        }
        if (!nogecos)
                pw.pw_gecos = argp->newpw.pw_gecos;
        if (!noshell)
                pw.pw_shell = argp->newpw.pw_shell;

        pw_copy(pfd, tfd, &pw, NULL);

        if (pw_mkdb(pw.pw_name, 0) < 0) {
                warnx("pw_mkdb failed");
                pw_abort();
                RETURN(1);
        }

        /* XXX RESTORE SIGNAL STATE? XXX */

        /* Notify caller we succeeded. */
        REPLY(0);

        /* Update the YP maps. */
        if (chdir("/var/yp"))
                err(EXIT_FAILURE, "/var/yp");
        (void) umask(022);
        (void) system(make_arg);

        handling_request = 0;
}