Fix passwd entries, from old format to new.

[minix3.git] / usr.sbin / pwd_mkdb / pwd_mkdb.c

/*      $NetBSD: pwd_mkdb.c,v 1.56 2012/11/26 20:13:54 pooka Exp $      */

/*
 * Copyright (c) 2000, 2009 The NetBSD Foundation, Inc.
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Copyright (c) 1991, 1993, 1994
 *      The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

/*
 * Portions Copyright(C) 1994, Jason Downs.  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(S) ``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(S) 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.
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if !defined(lint)
__COPYRIGHT("@(#) Copyright (c) 2000, 2009\
 The NetBSD Foundation, Inc.  All rights reserved.\
  Copyright (c) 1991, 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
__RCSID("$NetBSD: pwd_mkdb.c,v 1.56 2012/11/26 20:13:54 pooka Exp $");
#endif /* not lint */

#if HAVE_NBTOOL_CONFIG_H
#include "compat_pwd.h"
#else
#include <pwd.h>
#endif

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>

#ifndef HAVE_NBTOOL_CONFIG_H
#include <machine/bswap.h>
#endif

#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>

#ifndef HAVE_NBTOOL_CONFIG_H
#include <util.h>
#endif

#define MAX_CACHESIZE   8*1024*1024
#define MIN_CACHESIZE   2*1024*1024

#define PERM_INSECURE   (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH)
#define PERM_SECURE     (S_IRUSR | S_IWUSR)

#if HAVE_NBTOOL_CONFIG_H
static const char __yp_token[] = "__YP!";
#else
/* Pull this out of the C library. */
extern const char __yp_token[];
#endif

static HASHINFO openinfo = {
        4096,           /* bsize */
        32,             /* ffactor */
        256,            /* nelem */
        0,              /* cachesize */
        NULL,           /* hash() */
        0               /* lorder */
};

#define FILE_INSECURE   0x01
#define FILE_SECURE     0x02
#define FILE_ORIG       0x04


struct pwddb {
        DB *db;
        char dbname[MAX(MAXPATHLEN, LINE_MAX * 2)];
        const char *fname;
        uint32_t rversion;
        uint32_t wversion;
};

static char     *pname;                         /* password file name */
static char     prefix[MAXPATHLEN];
static char     oldpwdfile[MAX(MAXPATHLEN, LINE_MAX * 2)];
static int      lorder = BYTE_ORDER;
static int      logsyslog;
static int      clean;
static int      verbose;
static int      warning;
static struct pwddb sdb, idb;


void    bailout(void) __dead;
void    cp(const char *, const char *, mode_t);
void    deldbent(struct pwddb *, int, void *);
void    mkpw_error(const char *, ...) __dead;
void    mkpw_warning(const char *, ...);
int     getdbent(struct pwddb *, int, void *, struct passwd **);
void    inconsistency(void) __dead;
void    install(const char *, const char *);
int     main(int, char **);
void    putdbents(struct pwddb *, struct passwd *, const char *, int, int,
    u_int, u_int);
void    putyptoken(struct pwddb *);
void    rm(const char *);
int     scan(FILE *, struct passwd *, int *, int *);
void    usage(void) __dead;
void    wr_error(const char *) __dead;
uint32_t getversion(const char *);
void    setversion(struct pwddb *);

#ifndef __lint__
#define SWAP(sw) \
    ((sizeof(sw) == 2 ? (typeof(sw))bswap16((uint16_t)sw) : \
    (sizeof(sw) == 4 ? (typeof(sw))bswap32((uint32_t)sw) : \
    (sizeof(sw) == 8 ? (typeof(sw))bswap64((uint64_t)sw) : (abort(), 0)))))
#else
#define SWAP(sw) sw
#endif

static void
closedb(struct pwddb *db)
{
    if ((*db->db->close)(db->db) < 0)
            wr_error(db->dbname);
}

static void
opendb(struct pwddb *db, const char *dbname, const char *username,
    uint32_t req_version, int flags, mode_t perm)
{
        char buf[MAXPATHLEN];

        (void)snprintf(db->dbname, sizeof(db->dbname), "%s%s.tmp", prefix,
            dbname);

        if (username != NULL) {
                (void)snprintf(buf, sizeof(buf), "%s%s", prefix, dbname);
                cp(buf, db->dbname, perm);
        }

        db->db = dbopen(db->dbname, flags, perm, DB_HASH, &openinfo);
        if (db->db == NULL)
                mkpw_error("Cannot open `%s'", db->dbname);

        db->fname = dbname;
        db->rversion = getversion(dbname);
        if (req_version == ~0U)
                db->wversion = db->rversion;
        else
                db->wversion = req_version;

        if (warning && db->rversion == 0 && db->wversion == 0) {
                mkpw_warning("Database %s is a version %u database.",
                    db->fname, db->rversion);
                mkpw_warning("Use %s -V 1 to upgrade once you've recompiled "
                    "all your binaries.", getprogname());
        }
        if (db->wversion != db->rversion) {
                if (username != NULL) {
                        mkpw_warning("You cannot change a single "
                            "record from version %u to version %u\n",
                            db->rversion, db->wversion);
                        bailout();
                } else if (verbose) {
                    mkpw_warning("Changing %s from version %u to version %u",
                        db->fname, db->rversion, db->wversion);
                }
        } else {
                if (verbose)
                        mkpw_warning("File `%s' version %u requested %u",
                            db->fname, db->rversion, db->wversion);
        }

        setversion(db);
}

int
main(int argc, char *argv[])
{
        int ch, makeold, tfd, lineno, found, rv, hasyp, secureonly;
        struct passwd pwd, *tpwd;
        char *username;
        FILE *fp, *oldfp;
        sigset_t set;
        u_int dbflg, uid_dbflg;
        int newuser, olduid, flags;
        struct stat st;
        u_int cachesize;
        uint32_t req_version;

        prefix[0] = '\0';
        makeold = 0;
        oldfp = NULL;
        username = NULL;
        hasyp = 0;
        secureonly = 0;
        found = 0;
        newuser = 0;
        cachesize = 0;
        verbose = 0;
        warning = 0;
        logsyslog = 0;
        req_version = ~0U;

        while ((ch = getopt(argc, argv, "BLc:d:lpsu:V:vw")) != -1)
                switch (ch) {
                case 'B':                       /* big-endian output */
                        lorder = BIG_ENDIAN;
                        break;
                case 'L':                       /* little-endian output */
                        lorder = LITTLE_ENDIAN;
                        break;
                case 'c':
                        cachesize = atoi(optarg) * 1024 * 1024;
                        break;
                case 'd':                       /* set prefix */
                        (void)strlcpy(prefix, optarg, sizeof(prefix));
                        break;
                case 'l':
                        openlog(getprogname(), LOG_PID, LOG_AUTH);
                        logsyslog = 1;
                        break;
                case 'p':                       /* create V7 "file.orig" */
                        makeold = 1;
                        break;
                case 's':                       /* modify secure db only */
                        secureonly = 1;
                        break;
                case 'u':                       /* modify one user only */
                        username = optarg;
                        break;
                case 'V':
                        req_version = (uint32_t)atoi(optarg);
                        if (req_version > 1) {
                                mkpw_warning("Unknown version %u", req_version);
                                return EXIT_FAILURE;
                        }
                        break;
                case 'v':
                        verbose++;
                        break;
                case 'w':
                        warning++;
                        break;
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (argc != 1)
                usage();
        if (username != NULL)
                if (username[0] == '+' || username[0] == '-')
                        usage();
        if (secureonly)
                makeold = 0;

        /*
         * This could be changed to allow the user to interrupt.
         * Probably not worth the effort.
         */
        (void)sigemptyset(&set);
        (void)sigaddset(&set, SIGTSTP);
        (void)sigaddset(&set, SIGHUP);
        (void)sigaddset(&set, SIGINT);
        (void)sigaddset(&set, SIGQUIT);
        (void)sigaddset(&set, SIGTERM);
        (void)sigprocmask(SIG_BLOCK, &set, NULL);

        /* We don't care what the user wants. */
        (void)umask(0);

        if (username == NULL)
                flags = O_RDWR | O_CREAT | O_EXCL;
        else
                flags = O_RDWR;

        pname = *argv;
        /* Open the original password file */
        if ((fp = fopen(pname, "r")) == NULL)
                mkpw_error("Cannot open `%s'", pname);

        openinfo.lorder = lorder;

        if (fstat(fileno(fp), &st) == -1)
                mkpw_error("Cannot stat `%s'", pname);

        if (cachesize) {
                openinfo.cachesize = cachesize;
        } else {
                /* Tweak openinfo values for large passwd files. */
                cachesize = (u_int)(st.st_size * 20);
                if (cachesize > MAX_CACHESIZE)
                        cachesize = MAX_CACHESIZE;
                else if (cachesize < MIN_CACHESIZE)
                        cachesize = MIN_CACHESIZE;
                openinfo.cachesize = cachesize;
        }

        /* Open the temporary insecure password database. */
        if (!secureonly) {
                opendb(&idb, _PATH_MP_DB, username, req_version,
                    flags, PERM_INSECURE);
                clean |= FILE_INSECURE;
        }
                 

        /* Open the temporary encrypted password database. */
        opendb(&sdb, _PATH_SMP_DB, username, req_version, flags, PERM_SECURE);
        clean |= FILE_SECURE;

        /*
         * Open file for old password file.  Minor trickiness -- don't want to
         * chance the file already existing, since someone (stupidly) might
         * still be using this for permission checking.  So, open it first and
         * fdopen the resulting fd.  The resulting file should be readable by
         * everyone.
         */
        if (makeold) {
                (void)snprintf(oldpwdfile, sizeof(oldpwdfile), "%s.orig",
                    pname);
                if ((tfd = open(oldpwdfile, O_WRONLY | O_CREAT | O_EXCL,
                    PERM_INSECURE)) < 0)
                        mkpw_error("Cannot create `%s'", oldpwdfile);
                clean |= FILE_ORIG;
                if ((oldfp = fdopen(tfd, "w")) == NULL)
                        mkpw_error("Cannot fdopen `%s'", oldpwdfile);
        }

        if (username != NULL) {
                uid_dbflg = 0;
                dbflg = 0;

                /*
                 * Determine if this is a new entry.
                 */
                if (getdbent(&sdb, _PW_KEYBYNAME, username, &tpwd))
                        newuser = 1;
                else {
                        newuser = 0;
                        olduid = tpwd->pw_uid;
                }

        } else {
                uid_dbflg = R_NOOVERWRITE;
                dbflg = R_NOOVERWRITE;
        }

        /*
         * If we see something go by that looks like YP, we save a special
         * pointer record, which if YP is enabled in the C lib, will speed
         * things up.
         */
        for (lineno = 0; scan(fp, &pwd, &flags, &lineno);) {
                /*
                 * Create original format password file entry.
                 */
                if (makeold) {
                        (void)fprintf(oldfp, "%s:*:%d:%d:%s:%s:%s\n",
                            pwd.pw_name, pwd.pw_uid, pwd.pw_gid, pwd.pw_gecos,
                            pwd.pw_dir, pwd.pw_shell);
                        if (ferror(oldfp))
                                wr_error(oldpwdfile);
                }

                if (username == NULL) {
                        /* Look like YP? */
                        if (pwd.pw_name[0] == '+' || pwd.pw_name[0] == '-')
                                hasyp++;

                        /* Warn about potentially unsafe uid/gid overrides. */
                        if (pwd.pw_name[0] == '+') {
                                if ((flags & _PASSWORD_NOUID) == 0 &&
                                    pwd.pw_uid == 0)
                                        mkpw_warning("line %d: superuser "
                                            "override in YP inclusion", lineno);
                                if ((flags & _PASSWORD_NOGID) == 0 &&
                                    pwd.pw_gid == 0)
                                        mkpw_warning("line %d: wheel override "
                                            "in YP inclusion", lineno);
                        }

                        /* Write the database entry out. */
                        if (!secureonly)
                                putdbents(&idb, &pwd, "*", flags, lineno, dbflg,
                                    uid_dbflg);
                        continue;
                } else if (strcmp(username, pwd.pw_name) != 0)
                        continue;

                if (found) {
                        mkpw_warning("user `%s' listed twice in password file",
                            username);
                        bailout();
                }

                /*
                 * Ensure that the text file and database agree on
                 * which line the record is from.
                 */
                rv = getdbent(&sdb, _PW_KEYBYNUM, &lineno, &tpwd);
                if (newuser) {
                        if (rv == 0)
                                inconsistency();
                } else if (rv == 1 || strcmp(username, tpwd->pw_name) != 0)
                        inconsistency();
                else if ((uid_t)olduid != pwd.pw_uid) {
                        /*
                         * If we're changing UID, remove the BYUID
                         * record for the old UID only if it has the
                         * same username.
                         */
                        if (!getdbent(&sdb, _PW_KEYBYUID, &olduid, &tpwd)) {
                                if (strcmp(username, tpwd->pw_name) == 0) {
                                        if (!secureonly)
                                                deldbent(&idb, _PW_KEYBYUID,
                                                    &olduid);
                                        deldbent(&sdb, _PW_KEYBYUID, &olduid);
                                }
                        } else
                                inconsistency();
                }

                /*
                 * If there's an existing BYUID record for the new UID and
                 * the username doesn't match then be sure not to overwrite
                 * it.
                 */
                if (!getdbent(&sdb, _PW_KEYBYUID, &pwd.pw_uid, &tpwd))
                        if (strcmp(username, tpwd->pw_name) != 0)
                                uid_dbflg = R_NOOVERWRITE;

                /* Write the database entries out */
                if (!secureonly)
                        putdbents(&idb, &pwd, "*", flags, lineno, dbflg,
                            uid_dbflg);
                putdbents(&sdb, &pwd, pwd.pw_passwd, flags, lineno, dbflg,
                    uid_dbflg);

                found = 1;
                if (!makeold)
                        break;
        }

        if (!secureonly) {
                /* Store YP token if needed. */
                if (hasyp)
                        putyptoken(&idb);

                /* Close the insecure database. */
                closedb(&idb);
        }

        /*
         * If rebuilding the databases, we re-parse the text file and write
         * the secure entries out in a separate pass.
         */
        if (username == NULL) {
                rewind(fp);
                for (lineno = 0; scan(fp, &pwd, &flags, &lineno);)
                        putdbents(&sdb, &pwd, pwd.pw_passwd, flags,
                            lineno, dbflg, uid_dbflg);

                /* Store YP token if needed. */
                if (hasyp)
                        putyptoken(&sdb);
        } else if (!found) {
                mkpw_warning("user `%s' not found in password file", username);
                bailout();
        }

        /* Close the secure database. */
        closedb(&sdb);

        /* Install as the real password files. */
        if (!secureonly)
                install(idb.dbname, idb.fname);
        install(sdb.dbname, sdb.fname);

        /* Install the V7 password file. */
        if (makeold) {
                if (fflush(oldfp) == EOF)
                        wr_error(oldpwdfile);
                if (fclose(oldfp) == EOF)
                        wr_error(oldpwdfile);
                install(oldpwdfile, _PATH_PASSWD);
        }

        /* Set master.passwd permissions, in case caller forgot. */
        (void)fchmod(fileno(fp), S_IRUSR|S_IWUSR);
        if (fclose(fp) == EOF)
                wr_error(pname);

        /*
         * Move the temporary master password file LAST -- chpass(1),
         * passwd(1), vipw(8) and friends all use its existence to block
         * other incarnations of themselves.  The rename means that
         * everything is unlocked, as the original file can no longer be
         * accessed.
         */
        install(pname, _PATH_MASTERPASSWD);
        exit(EXIT_SUCCESS);
        /* NOTREACHED */
}

int
scan(FILE *fp, struct passwd *pw, int *flags, int *lineno)
{
        static char line[LINE_MAX];
        char *p;
        int oflags;

        if (fgets(line, (int)sizeof(line), fp) == NULL)
                return (0);
        (*lineno)++;

        /*
         * ``... if I swallow anything evil, put your fingers down my
         * throat...''
         *      -- The Who
         */
        if ((p = strchr(line, '\n')) == NULL) {
                errno = EFTYPE; /* XXX */
                mkpw_error("%s, %d: line too long", pname, *lineno);
        }
        *p = '\0';
        if (strcmp(line, "+") == 0) {
                /* pw_scan() can't handle "+" */
                (void)strcpy(line, "+:::::::::");
        }
        oflags = 0;
        if (!pw_scan(line, pw, &oflags)) {
                errno = EFTYPE; /* XXX */
                mkpw_error("%s, %d: Syntax mkpw_error", pname, *lineno);
        }
        *flags = oflags;

        return (1);
}

void
install(const char *from, const char *to)
{
        char buf[MAXPATHLEN];

        (void)snprintf(buf, sizeof(buf), "%s%s", prefix, to);
        if (rename(from, buf))
                mkpw_error("Cannot rename `%s' to `%s'", from, buf);
}

void
rm(const char *victim)
{

        if (unlink(victim) < 0)
                warn("unlink(%s)", victim);
}

void                    
cp(const char *from, const char *to, mode_t mode)              
{               
        static char buf[MAXBSIZE];
        int from_fd, to_fd;
        ssize_t rcount, wcount;

        if ((from_fd = open(from, O_RDONLY, 0)) < 0)
                mkpw_error("Cannot open `%s'", from);
        if ((to_fd = open(to, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
                (void)close(from_fd);
                mkpw_error("Cannot open `%s'", to);
        }
        while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
                wcount = write(to_fd, buf, (size_t)rcount);
                if (rcount != wcount || wcount == -1) {
                        (void)close(from_fd);
                        (void)close(to_fd);
                        goto on_error;
                }
        }

        close(from_fd);
        if (close(to_fd))
                goto on_error;
        if (rcount < 0)
                goto on_error;
        return;

on_error:
        mkpw_error("Cannot copy `%s' to `%s'", from, to);
}

void
wr_error(const char *str)
{
        mkpw_error("Cannot write `%s'", str);
}

void
mkpw_error(const char *fmt, ...)
{
        va_list ap;
        va_start(ap, fmt);
        if (logsyslog) {
                int sverrno = errno;
                char efmt[BUFSIZ];
                snprintf(efmt, sizeof(efmt), "%s (%%m)", fmt);
                errno = sverrno;
                vsyslog(LOG_ERR, efmt, ap);
        } else
                vwarn(fmt, ap);
        va_end(ap);
        bailout();
}

void
mkpw_warning(const char *fmt, ...)
{
        va_list ap;
        va_start(ap, fmt);
        if (logsyslog)
                vsyslog(LOG_WARNING, fmt, ap);
        else
                vwarnx(fmt, ap);
        va_end(ap);
}

void
inconsistency(void)
{

        mkpw_warning("text files and databases are inconsistent");
        mkpw_warning("re-build the databases without -u");
        bailout();
}

void
bailout(void)
{

        if ((clean & FILE_ORIG) != 0)
                rm(oldpwdfile);
        if ((clean & FILE_SECURE) != 0)
                rm(sdb.dbname);
        if ((clean & FILE_INSECURE) != 0)
                rm(idb.dbname);

        exit(EXIT_FAILURE);
}

uint32_t
getversion(const char *fname)
{
        DBT data, key;
        int ret;
        uint32_t version = 0;
        DB *db;

        db = dbopen(fname, O_RDONLY, PERM_INSECURE, DB_HASH, NULL);
        if (db == NULL) {
                /* If we are building on a separate root, assume version 1 */
                if ((errno == EACCES || errno == ENOENT) && prefix[0])
                        return 1;
                mkpw_warning("Cannot open database `%s'", fname);
                bailout();
        }
        key.data = __UNCONST("VERSION");
        key.size = strlen((const char *)key.data) + 1;

        switch (ret = (*db->get)(db, &key, &data, 0)) {
        case -1:        /* Error */
                mkpw_warning("Cannot get VERSION record from database `%s'",
                    fname);
                goto out;
        case 0:
                if (data.size != sizeof(version)) {
                    mkpw_warning("Bad VERSION record in database `%s'", fname);
                    goto out;
                }
                (void)memcpy(&version, data.data, sizeof(version));
                /*FALLTHROUGH*/
        case 1:
                if (ret == 1)
                        mkpw_warning("Database `%s' has no version info",
                            fname);
                (*db->close)(db);
                return version;
        default:
                mkpw_warning("internal mkpw_error db->get returns %d", ret);
                goto out;
        }
out:
        (*db->close)(db);
        bailout();
        /*NOTREACHED*/
}

void
setversion(struct pwddb *db)
{
        DBT data, key;
        key.data = __UNCONST("VERSION");
        key.size = strlen((const char *)key.data) + 1;

        data.data = &db->wversion;
        data.size = sizeof(uint32_t);

        if ((*db->db->put)(db->db, &key, &data, 0) != 0) {
                mkpw_warning("Can't write VERSION record to `%s'", db->dbname);
                bailout();
        }
}


/*
 * Write entries to a database for a single user. 
 *
 * The databases actually contain three copies of the original data.  Each
 * password file entry is converted into a rough approximation of a ``struct
 * passwd'', with the strings placed inline.  This object is then stored as
 * the data for three separate keys.  The first key * is the pw_name field
 * prepended by the _PW_KEYBYNAME character.  The second key is the pw_uid
 * field prepended by the _PW_KEYBYUID character.  The third key is the line
 * number in the original file prepended by the _PW_KEYBYNUM character. 
 * (The special characters are prepended to ensure that the keys do not
 * collide.)
 */
#define COMPACT(e)      for (t = e; (*p++ = *t++) != '\0';)

void
putdbents(struct pwddb *db, struct passwd *pw, const char *passwd, int flags,
      int lineno, u_int dbflg, u_int uid_dbflg)
{
        struct passwd pwd;
        char buf[MAX(MAXPATHLEN, LINE_MAX * 2)], tbuf[1024], *p;
        DBT data, key;
        const char *t;
        u_int32_t x;
        size_t len;

        (void)memcpy(&pwd, pw, sizeof(pwd));
        data.data = (u_char *)buf;
        key.data = (u_char *)tbuf;

        if (lorder != BYTE_ORDER) {
                pwd.pw_uid = SWAP(pwd.pw_uid);
                pwd.pw_gid = SWAP(pwd.pw_gid);
        }

#define WRITEPWTIMEVAR(pwvar) \
        do { \
                if (db->wversion == 0 && \
                    /*CONSTCOND*/sizeof(pwvar) == sizeof(uint64_t)) { \
                        uint32_t tmp = (uint32_t)pwvar; \
                        if (lorder != BYTE_ORDER) \
                                tmp = SWAP(tmp); \
                        (void)memmove(p, &tmp, sizeof(tmp)); \
                        p += sizeof(tmp); \
                } else if (db->wversion == 1 && \
                    /*CONSTCOND*/sizeof(pwvar) == sizeof(uint32_t)) { \
                        uint64_t tmp = pwvar; \
                        if (lorder != BYTE_ORDER) \
                                tmp = SWAP(tmp); \
                        (void)memmove(p, &tmp, sizeof(tmp)); \
                        p += sizeof(tmp); \
                } else { \
                        if (lorder != BYTE_ORDER) \
                                pwvar = SWAP(pwvar); \
                        (void)memmove(p, &pwvar, sizeof(pwvar)); \
                        p += sizeof(pwvar); \
                } \
        } while (/*CONSTCOND*/0)

        /* Create insecure data. */
        p = buf;
        COMPACT(pwd.pw_name);
        COMPACT(passwd);
        (void)memmove(p, &pwd.pw_uid, sizeof(pwd.pw_uid));
        p += sizeof(pwd.pw_uid);
        (void)memmove(p, &pwd.pw_gid, sizeof(pwd.pw_gid));
        p += sizeof(pwd.pw_gid);
        WRITEPWTIMEVAR(pwd.pw_change);
        COMPACT(pwd.pw_class);
        COMPACT(pwd.pw_gecos);
        COMPACT(pwd.pw_dir);
        COMPACT(pwd.pw_shell);
        WRITEPWTIMEVAR(pwd.pw_expire);
        x = flags;
        if (lorder != BYTE_ORDER)
                x = SWAP(x);
        (void)memmove(p, &x, sizeof(x));
        p += sizeof(x);
        data.size = p - buf;

        /* Store insecure by name. */
        tbuf[0] = _PW_KEYBYNAME;
        len = strlen(pwd.pw_name);
        (void)memmove(tbuf + 1, pwd.pw_name, len);
        key.size = len + 1;
        if ((*db->db->put)(db->db, &key, &data, dbflg) == -1)
                wr_error(db->dbname);

        /* Store insecure by number. */
        tbuf[0] = _PW_KEYBYNUM;
        x = lineno;
        if (lorder != BYTE_ORDER)
                x = SWAP(x);
        (void)memmove(tbuf + 1, &x, sizeof(x));
        key.size = sizeof(x) + 1;
        if ((*db->db->put)(db->db, &key, &data, dbflg) == -1)
                wr_error(db->dbname);

        /* Store insecure by uid. */
        tbuf[0] = _PW_KEYBYUID;
        (void)memmove(tbuf + 1, &pwd.pw_uid, sizeof(pwd.pw_uid));
        key.size = sizeof(pwd.pw_uid) + 1;
        if ((*db->db->put)(db->db, &key, &data, uid_dbflg) == -1)
                wr_error(db->dbname);
}

void
deldbent(struct pwddb *db, int type, void *keyp)
{
        char tbuf[1024];
        DBT key;
        u_int32_t x;
        size_t len;

        key.data = (u_char *)tbuf;

        switch (tbuf[0] = type) {
        case _PW_KEYBYNAME:
                len = strlen((char *)keyp);
                (void)memcpy(tbuf + 1, keyp, len);
                key.size = len + 1;
                break;

        case _PW_KEYBYNUM:
        case _PW_KEYBYUID:
                x = *(int *)keyp;
                if (lorder != BYTE_ORDER)
                        x = SWAP(x);
                (void)memmove(tbuf + 1, &x, sizeof(x));
                key.size = sizeof(x) + 1;
                break;
        }

        if ((*db->db->del)(db->db, &key, 0) == -1)
                wr_error(db->dbname);
}

int
getdbent(struct pwddb *db, int type, void *keyp, struct passwd **tpwd)
{
        static char buf[MAX(MAXPATHLEN, LINE_MAX * 2)];
        static struct passwd pwd;
        char tbuf[1024], *p;
        DBT key, data;
        u_int32_t x;
        size_t len;
        int rv;

        data.data = (u_char *)buf;
        data.size = sizeof(buf);
        key.data = (u_char *)tbuf;

        switch (tbuf[0] = type) {
        case _PW_KEYBYNAME:
                len = strlen((char *)keyp);
                (void)memcpy(tbuf + 1, keyp, len);
                key.size = len + 1;
                break;

        case _PW_KEYBYNUM:
        case _PW_KEYBYUID:
                x = *(int *)keyp;
                if (lorder != BYTE_ORDER)
                        x = SWAP(x);
                (void)memmove(tbuf + 1, &x, sizeof(x));
                key.size = sizeof(x) + 1;
                break;
        }

        if ((rv = (*db->db->get)(db->db, &key, &data, 0)) == 1)
                return (rv);
        if (rv == -1)
                mkpw_error("Error getting record from `%s'", db->dbname);

        p = (char *)data.data;

        pwd.pw_name = p;
        while (*p++ != '\0')
                continue;
        pwd.pw_passwd = p;
        while (*p++ != '\0')
                continue;

        (void)memcpy(&pwd.pw_uid, p, sizeof(pwd.pw_uid));
        p += sizeof(pwd.pw_uid);
        (void)memcpy(&pwd.pw_gid, p, sizeof(pwd.pw_gid));
        p += sizeof(pwd.pw_gid);

#define READPWTIMEVAR(pwvar) \
        do { \
                if (db->rversion == 0 && \
                    /*CONSTCOND*/sizeof(pwvar) == sizeof(uint64_t)) { \
                        uint32_t tmp; \
                        (void)memcpy(&tmp, p, sizeof(tmp)); \
                        p += sizeof(tmp); \
                        if (lorder != BYTE_ORDER) \
                                pwvar = SWAP(tmp); \
                        else \
                                pwvar = tmp; \
                } else if (db->rversion == 1 && \
                    /*CONSTCOND*/sizeof(pwvar) == sizeof(uint32_t)) { \
                        uint64_t tmp; \
                        (void)memcpy(&tmp, p, sizeof(tmp)); \
                        p += sizeof(tmp); \
                        if (lorder != BYTE_ORDER) \
                                pwvar = (uint32_t)SWAP(tmp); \
                        else \
                                pwvar = (uint32_t)tmp; \
                } else { \
                        (void)memcpy(&pwvar, p, sizeof(pwvar)); \
                        p += sizeof(pwvar); \
                        if (lorder != BYTE_ORDER) \
                                pwvar = SWAP(pwvar); \
                } \
        } while (/*CONSTCOND*/0)
                
        READPWTIMEVAR(pwd.pw_change);

        pwd.pw_class = p;
        while (*p++ != '\0')
                continue;
        pwd.pw_gecos = p;
        while (*p++ != '\0')
                continue;
        pwd.pw_dir = p;
        while (*p++ != '\0')
                continue;
        pwd.pw_shell = p;
        while (*p++ != '\0')
                continue;

        READPWTIMEVAR(pwd.pw_expire);

        if (lorder != BYTE_ORDER) {
                pwd.pw_uid = SWAP(pwd.pw_uid);
                pwd.pw_gid = SWAP(pwd.pw_gid);
        }

        *tpwd = &pwd;
        return (0);
}

void
putyptoken(struct pwddb *db)
{
        DBT data, key;

        key.data = __UNCONST(__yp_token);
        key.size = strlen(__yp_token);
        data.data = NULL;
        data.size = 0;

        if ((*db->db->put)(db->db, &key, &data, R_NOOVERWRITE) == -1)
                wr_error(db->dbname);
}

void
usage(void)
{

        (void)fprintf(stderr,
            "Usage: %s [-BLlpsvw] [-c cachesize] [-d directory] [-u user] "
            "[-V version] file\n",
            getprogname());
        exit(EXIT_FAILURE);
}