/* ctl_cyrusdb.c -- Program to perform operations common to all cyrus DBs
 *
 * Copyright (c) 1994-2008 Carnegie Mellon University.  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. The name "Carnegie Mellon University" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For permission or any legal
 *    details, please contact
 *      Carnegie Mellon University
 *      Center for Technology Transfer and Enterprise Creation
 *      4615 Forbes Avenue
 *      Suite 302
 *      Pittsburgh, PA  15213
 *      (412) 268-7393, fax: (412) 268-7395
 *      innovation@andrew.cmu.edu
 *
 * 4. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by Computing Services
 *     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
 *
 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
 * FOR ANY SPECIAL, 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.
 *
 * $Id: ctl_cyrusdb.c,v 1.33 2010/01/06 17:01:30 murch Exp $
 */

#include <config.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <syslog.h>
#include <errno.h>

#if HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# if HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# if HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif

#include "annotate.h"
#include "cyrusdb.h"
#include "duplicate.h"
#include "global.h"
#include "exitcodes.h"
#include "libcyr_cfg.h"
#include "mboxlist.h"
#include "seen.h"
#include "statuscache.h"
#include "tls.h"
#include "util.h"
#include "xmalloc.h"

#define N(a) (sizeof(a) / sizeof(a[0]))

/* config.c stuff */
const int config_need_data = 0;

struct cyrusdb {
    const char *name;
    struct cyrusdb_backend **backendptr;
    int archive;
} dblist[] = {
    { FNAME_MBOXLIST,		&config_mboxlist_db,	1 },
    { FNAME_QUOTADB,		&config_quota_db,	1 },
    { FNAME_ANNOTATIONS,	&config_annotation_db,	1 },
    { FNAME_DELIVERDB,		&config_duplicate_db,	0 },
    { FNAME_TLSSESSIONS,	&config_tlscache_db,	0 },
    { FNAME_PTSDB,		&config_ptscache_db,	0 },
    { FNAME_STATUSCACHEDB,	&config_statuscache_db,	0 },
    { NULL,			NULL,			0 }
};

static int compdb(const void *v1, const void *v2)
{
    struct cyrusdb *db1 = (struct cyrusdb *) v1;
    struct cyrusdb *db2 = (struct cyrusdb *) v2;
    struct cyrusdb_backend *b1 = *db1->backendptr;
    struct cyrusdb_backend *b2 = *db2->backendptr;

    /* compare archive pointers for sort */
    return (b1->archive - b2->archive);
}

void usage(void)
{
    fprintf(stderr, "ctl_cyrusdb [-C <altconfig>] -c\n");
    fprintf(stderr, "ctl_cyrusdb [-C <altconfig>] -r [-x]\n");
    exit(-1);
}

/* Callback for use by recover_reserved */
static int fixmbox(char *name,
		   int matchlen __attribute__((unused)),
		   int maycreate __attribute__((unused)),
		   void *rock __attribute__((unused)))
{
    struct mboxlist_entry mbentry;
    int r;

    r = mboxlist_lookup(name, &mbentry, NULL);

    /* if MBTYPE_RESERVED, unset it & call mboxlist_delete */
    if(!r && (mbentry.mbtype & MBTYPE_RESERVE)) {
	if(!r) {
	    r = mboxlist_deletemailbox(name, 1, NULL, NULL, 0, 0, 1);
	    if(r) {
		/* log the error */
		syslog(LOG_ERR,
		       "could not remove reserved mailbox '%s': %s",
		       name, error_message(r));
	    } else {
		syslog(LOG_ERR,
		       "removed reserved mailbox '%s'",
		       name);
	    }
	}
    }

    return 0;
}
void recover_reserved() 
{
    char pattern[2] = { '*', '\0' };
    
    mboxlist_init(0);
    mboxlist_open(NULL);

    /* Need annotations.db for mboxlist_deletemailbox() */
    annotatemore_init(0, NULL, NULL);
    annotatemore_open(NULL);

    /* Need quotadb for deleting mailboxes with quotas */
    quotadb_init(0);
    quotadb_open(NULL);

    /* build a list of mailboxes - we're using internal names here */
    mboxlist_findall(NULL, pattern, 1, NULL,
		     NULL, fixmbox, NULL);

    quotadb_close();
    quotadb_done();

    annotatemore_close();
    annotatemore_done();

    mboxlist_close();
    mboxlist_done();
}

static const char *dbfname(struct cyrusdb *db)
{
    static char buf[MAX_MAILBOX_PATH];
    snprintf(buf, MAX_MAILBOX_PATH, "%s%s", config_dir, db->name);
    return buf;
}

static void check_convert(struct cyrusdb *db, const char *fname)
{
    struct cyrusdb_backend *backend = *db->backendptr;
    struct cyrusdb_backend *oldbe;
    const char *detectname = cyrusdb_detect(fname);
    char newfname[MAX_MAILBOX_PATH];
    char backendbuf[100];
    char *p;

    /* unable to detect current type, assume all is good */
    if (!detectname) return;

    /* strip the -nosync from the name if present */
    strncpy(backendbuf, backend->name, 100);
    p = strstr(backendbuf, "-nosync");
    if (p) *p = '\0';

    /* ignore files that are already the right type */
    if (!strcmp(backendbuf, detectname)) return;

    /* otherwise we need to upgrade! */
    syslog(LOG_NOTICE, "converting %s from %s to %s",
	   fname, detectname, backend->name);

    oldbe = cyrusdb_fromname(detectname);

    snprintf(newfname, MAX_MAILBOX_PATH, "%s.NEW", fname);
    cyrusdb_convert(fname, newfname, oldbe, backend);
    if (rename(newfname, fname) == -1)
	syslog(LOG_ERR, "failed to rename upgraded file %s", fname);
}

int main(int argc, char *argv[])
{
    extern char *optarg;
    int opt, r, r2;
    char *alt_config = NULL;
    int reserve_flag = 1;
    enum { RECOVER, CHECKPOINT, NONE } op = NONE;
    char dirname[1024], backup1[1024], backup2[1024];
    char *archive_files[N(dblist)];
    char *msg = "";
    int i, j, rotated = 0;

    if ((geteuid()) == 0 && (become_cyrus() != 0)) {
	fatal("must run as the Cyrus user", EC_USAGE);
    }
    r = r2 = 0;

    while ((opt = getopt(argc, argv, "C:rxc")) != EOF) {
	switch (opt) {
	case 'C': /* alt config file */
	    alt_config = optarg;
	    break;

	case 'r':
	    libcyrus_config_setint(CYRUSOPT_DB_INIT_FLAGS, CYRUSDB_RECOVER);
	    msg = "recovering cyrus databases";
	    if (op == NONE) op = RECOVER;
	    else usage();
	    break;

	case 'c':
	    msg = "checkpointing cyrus databases";
	    if (op == NONE) op = CHECKPOINT;
	    else usage();
	    break;

	case 'x':
	    reserve_flag = 0;
	    break;

	default:
	    usage();
	    break;
	}
    }

    if (op == NONE || (op != RECOVER && !reserve_flag)) {
	usage();
	/* NOTREACHED */
    }

    cyrus_init(alt_config, "ctl_cyrusdb", 0);

    /* create the name of the db directory */
    /* (used by backup directory names) */
    strcpy(dirname, config_dir);
    strcat(dirname, FNAME_DBDIR);

    /* create the names of the backup directories */
    strcpy(backup1, dirname);
    strcat(backup1, ".backup1");
    strcpy(backup2, dirname);
    strcat(backup2, ".backup2");

    syslog(LOG_NOTICE, "%s", msg);

    /* sort dbenvs */
    qsort(dblist, N(dblist)-1, sizeof(struct cyrusdb), &compdb);

    memset(archive_files, 0, N(dblist) * sizeof(char*));
    for (i = 0, j = 0; dblist[i].name != NULL; i++) {
	const char *fname = dbfname(&dblist[i]);
	struct cyrusdb_backend *backend = *dblist[i].backendptr;

	if (op == RECOVER)
	    check_convert(&dblist[i], fname);

	/* if we need to archive this db, add it to the list */
	if (dblist[i].archive) {
	    archive_files[j++] = xstrdup(fname);
	}

	/* deal with each dbenv once */
	if (dblist[i+1].backendptr &&
	   (*(dblist[i+1].backendptr))->archive == backend->archive) continue;

	r = r2 = 0;
	switch (op) {
	case RECOVER:
	    break;
	    
	case CHECKPOINT:
	    r2 = backend->sync();
	    if (r2) {
		syslog(LOG_ERR, "DBERROR: sync %s: %s", dirname,
		       cyrusdb_strerror(r2));
		fprintf(stderr, 
			"ctl_cyrusdb: unable to sync environment\n");
	    }

	    /* ARCHIVE */
	    r2 = 0;

	    if (!rotated) {
		/* rotate the backup directories -- ONE time only */
		char *tail;
		DIR *dirp;
		struct dirent *dirent;

		tail = backup2 + strlen(backup2);

		/* remove db.backup2 */
		dirp = opendir(backup2);
		strcat(tail++, "/");

		if (dirp) {
		    while ((dirent = readdir(dirp)) != NULL) {
			if (dirent->d_name[0] == '.') continue;

			strcpy(tail, dirent->d_name);
			unlink(backup2);
		    }

		    closedir(dirp);
		}
		tail[-1] = '\0';
		r2 = rmdir(backup2);

		/* move db.backup1 to db.backup2 */
		if (r2 == 0 || errno == ENOENT)
		    r2 = rename(backup1, backup2);

		/* make a new db.backup1 */
		if (r2 == 0 || errno == ENOENT)
		    r2 = mkdir(backup1, 0755);

		rotated = 1;
	    }

	    /* do the archive */
	    if (r2 == 0)
		r2 = backend->archive((const char**) archive_files, backup1);

	    if (r2) {
		syslog(LOG_ERR, "DBERROR: archive %s: %s", dirname,
		       cyrusdb_strerror(r2));
		fprintf(stderr, 
			"ctl_cyrusdb: unable to archive environment\n");
	    }

	    break;
	    
	default:
	    break;
	}

	/* free the archive_list */
	while (j > 0) {
	    free(archive_files[--j]);
	    archive_files[j] = NULL;
	}
    }

    if(op == RECOVER && reserve_flag)
	recover_reserved();

    cyrus_done();

    syslog(LOG_NOTICE, "done %s", msg);
    exit(r || r2);
}