sync_support.c
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	/* sync_support.c -- Cyrus synchonization support functions
	*
	* 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: sync_support.c,v 1.25 2010/01/06 17:01:41 murch Exp $
	*/

	#include <config.h>

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

	#include "global.h"
	#include "assert.h"
	#include "bsearch.h"
	#include "mboxlist.h"
	#include "exitcodes.h"
	#include "imap/imap_err.h"
	#include "mailbox.h"
	#include "quota.h"
	#include "xmalloc.h"
	#include "acl.h"
	#include "seen.h"
	#include "mboxname.h"
	#include "map.h"
	#include "imapd.h"
	#include "message.h"
	#include "util.h"
	#include "user.h"
	#include "retry.h"
	#include "cyr_lock.h"
	#include "prot.h"
	#include "dlist.h"

	#include "message_guid.h"
	#include "sync_support.h"
	#include "sync_log.h"

	/* Parse routines */

	char *sync_encode_options(int options)
	{
	static char buf[4];
	int i = 0;

	if (options & OPT_POP3_NEW_UIDL)
	buf[i++] = 'P';
	if (options & OPT_IMAP_SHAREDSEEN)
	buf[i++] = 'S';
	if (options & OPT_IMAP_DUPDELIVER)
	buf[i++] = 'D';
	buf[i] = '\0';

	return buf;
	}

	int sync_parse_options(const char *options)
	{
	int res = 0;
	const char *p = options;

	if (!options) return 0;

	while (*p) {
	switch(*p) {
	case 'P':
	res \|= OPT_POP3_NEW_UIDL;
	break;
	case 'S':
	res \|= OPT_IMAP_SHAREDSEEN;
	break;
	case 'D':
	res \|= OPT_IMAP_DUPDELIVER;
	break;
	}
	p++;
	}

	return res;
	}

	/* Get a simple line (typically error text) */
	static int sync_getline(struct protstream in, struct buf buf)
	{
	int c;

	buf_reset(buf);

	for (;;) {
	c = prot_getc(in);

	if (c == EOF \|\| (c == '\r') \|\| (c == '\n')) {
	/* Munch optional LF after CR */
	if (c == '\r' && ((c = prot_getc(in)) != EOF && c != '\n')) {
	prot_ungetc(c, in);
	c = '\r';
	}
	buf_cstring(buf);
	return c;
	}
	if (buf->len > config_maxword)
	fatal("word too long", EC_IOERR);
	buf_putc(buf, c);
	}
	return c;
	}

	/* ====================================================================== */

	void sync_print_flags(struct dlist *kl,
	struct mailbox *mailbox,
	struct index_record *record)
	{
	int flag;
	struct dlist *fl = dlist_newlist(kl, "FLAGS");

	if (record->system_flags & FLAG_DELETED)
	dlist_setflag(fl, "FLAG", "\\Deleted");
	if (record->system_flags & FLAG_ANSWERED)
	dlist_setflag(fl, "FLAG", "\\Answered");
	if (record->system_flags & FLAG_FLAGGED)
	dlist_setflag(fl, "FLAG", "\\Flagged");
	if (record->system_flags & FLAG_DRAFT)
	dlist_setflag(fl, "FLAG", "\\Draft");
	if (record->system_flags & FLAG_EXPUNGED)
	dlist_setflag(fl, "FLAG", "\\Expunged");
	if (record->system_flags & FLAG_SEEN)
	dlist_setflag(fl, "FLAG", "\\Seen");

	/* print user flags in mailbox order */
	for (flag = 0; flag < MAX_USER_FLAGS; flag++) {
	if (!mailbox->flagname[flag])
	continue;
	if (!(record->user_flags[flag/32] & (1<<(flag&31))))
	continue;
	dlist_setflag(fl, "FLAG", mailbox->flagname[flag]);
	}
	}

	int sync_getflags(struct dlist *kl,
	struct mailbox *mailbox,
	struct index_record *record)
	{
	struct dlist *ki;
	int userflag;

	for (ki = kl->head; ki; ki = ki->next) {
	char *s = xstrdup(ki->sval);

	if (s[0] == '\\') {
	/* System flags */
	lcase(s);
	if (!strcmp(s, "\\seen")) {
	record->system_flags \|= FLAG_SEEN;
	} else if (!strcmp(s, "\\expunged")) {
	record->system_flags \|= FLAG_EXPUNGED;
	} else if (!strcmp(s, "\\answered")) {
	record->system_flags \|= FLAG_ANSWERED;
	} else if (!strcmp(s, "\\flagged")) {
	record->system_flags \|= FLAG_FLAGGED;
	} else if (!strcmp(s, "\\deleted")) {
	record->system_flags \|= FLAG_DELETED;
	} else if (!strcmp(s, "\\draft")) {
	record->system_flags \|= FLAG_DRAFT;
	} else {
	syslog(LOG_ERR, "Unknown system flag: %s", s);
	}
	}
	else {
	if (mailbox_user_flag(mailbox, s, &userflag, 1)) {
	syslog(LOG_ERR, "Unable to record user flag: %s", s);
	free(s);
	return IMAP_IOERROR;
	}
	record->user_flags[userflag/32] \|= 1<<(userflag&31);
	}

	free(s);
	}

	return 0;
	}

	int parse_upload(struct dlist kr, struct mailbox mailbox,
	struct index_record *record,
	struct sync_annot_list **salp)
	{
	struct dlist *fl;
	struct message_guid *tmpguid;
	int r;

	memset(record, 0, sizeof(struct index_record));

	if (!dlist_getnum32(kr, "UID", &record->uid))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getnum64(kr, "MODSEQ", &record->modseq))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getdate(kr, "LAST_UPDATED", &record->last_updated))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getlist(kr, "FLAGS", &fl))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getdate(kr, "INTERNALDATE", &record->internaldate))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getnum32(kr, "SIZE", &record->size))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getguid(kr, "GUID", &tmpguid))
	return IMAP_PROTOCOL_BAD_PARAMETERS;

	record->guid = *tmpguid;

	/* parse the flags */
	r = sync_getflags(fl, mailbox, record);
	if (r) return r;

	/* the ANNOTATIONS list is optional too */
	if (salp && dlist_getlist(kr, "ANNOTATIONS", &fl))
	decode_annotations(fl, salp);

	return 0;
	}


	/* ====================================================================== */

	struct sync_msgid_list *sync_msgid_list_create(int hash_size)
	{
	struct sync_msgid_list *l = xzmalloc(sizeof (struct sync_msgid_list));

	/* Pick a sensible default if no size given */
	if (hash_size == 0)
	hash_size = 256;

	l->head = NULL;
	l->tail = NULL;
	l->hash_size = hash_size;
	l->hash = xzmalloc(hash_size * sizeof(struct sync_msgid *));
	l->count = 0;
	l->toupload = 0;

	return(l);
	}

	struct sync_msgid sync_msgid_insert(struct sync_msgid_list l,
	struct message_guid *guid)
	{
	struct sync_msgid *msgid;
	int offset;

	if (message_guid_isnull(guid))
	return NULL;

	offset = message_guid_hash(guid, l->hash_size);

	/* do we already have it? Don't add it again */
	for (msgid = l->hash[offset] ; msgid ; msgid = msgid->hash_next) {
	if (message_guid_equal(&msgid->guid, guid))
	return msgid;
	}

	msgid = xzmalloc(sizeof(struct sync_msgid));
	msgid->need_upload = 1;
	message_guid_copy(&msgid->guid, guid);

	l->count++;
	l->toupload++;

	if (l->tail)
	l->tail = l->tail->next = msgid;
	else
	l->head = l->tail = msgid;

	/* Insert at start of list */
	msgid->hash_next = l->hash[offset];
	l->hash[offset] = msgid;

	return msgid;
	}

	void sync_msgid_list_free(struct sync_msgid_list **lp)
	{
	struct sync_msgid_list l = lp;
	struct sync_msgid current, next;

	current = l->head;
	while (current) {
	next = current->next;
	free(current);
	current = next;
	}
	free(l->hash);
	free(l);

	*lp = NULL;
	}

	struct sync_msgid sync_msgid_lookup(struct sync_msgid_list l,
	struct message_guid *guid)
	{
	int offset = message_guid_hash(guid, l->hash_size);
	struct sync_msgid *msgid;

	if (message_guid_isnull(guid))
	return(NULL);

	for (msgid = l->hash[offset] ; msgid ; msgid = msgid->hash_next) {
	if (message_guid_equal(&msgid->guid, guid))
	return(msgid);
	}

	return(NULL);
	}

	struct sync_reserve_list *sync_reserve_list_create(int hash_size)
	{
	struct sync_reserve_list *l = xmalloc(sizeof(struct sync_reserve_list));

	l->head = NULL;
	l->tail = NULL;
	l->hash_size = hash_size;

	return l;
	}

	struct sync_msgid_list sync_reserve_partlist(struct sync_reserve_list l,
	const char *part)
	{
	struct sync_reserve *item;

	for (item = l->head; item; item = item->next) {
	if (!strcmp(item->part, part))
	return item->list;
	}

	/* not found, create it */
	item = xmalloc(sizeof(struct sync_reserve));
	item->part = xstrdup(part);
	item->next = NULL;
	item->list = sync_msgid_list_create(l->hash_size);

	if (l->tail)
	l->tail = l->tail->next = item;
	else
	l->tail = l->head = item;

	return item->list;
	}

	void sync_reserve_list_free(struct sync_reserve_list **lp)
	{
	struct sync_reserve_list l = lp;
	struct sync_reserve current, next;

	current = l->head;
	while (current) {
	next = current->next;
	sync_msgid_list_free(&current->list);
	free(current->part);
	free(current);
	current = next;
	}
	free(l);

	*lp = NULL;
	}

	/* ====================================================================== */

	struct sync_folder_list *sync_folder_list_create(void)
	{
	struct sync_folder_list *l = xzmalloc(sizeof (struct sync_folder_list));

	l->head = NULL;
	l->tail = NULL;
	l->count = 0;

	return(l);
	}

	struct sync_folder sync_folder_list_add(struct sync_folder_list l,
	const char uniqueid, const char name,
	const char part, const char acl,
	uint32_t options,
	uint32_t uidvalidity,
	uint32_t last_uid,
	modseq_t highestmodseq,
	uint32_t crc,
	uint32_t recentuid,
	time_t recenttime,
	time_t pop3_last_login,
	const char *specialuse,
	time_t pop3_show_after,
	struct sync_annot_list *annots)
	{
	struct sync_folder *result = xzmalloc(sizeof(struct sync_folder));

	if (l->tail)
	l->tail = l->tail->next = result;
	else
	l->head = l->tail = result;

	l->count++;

	result->next = NULL;

	result->uniqueid = xstrdupnull(uniqueid);
	result->name = xstrdupnull(name);
	result->part = xstrdupnull(part);
	result->acl = xstrdupnull(acl);
	result->uidvalidity = uidvalidity;
	result->last_uid = last_uid;
	result->highestmodseq = highestmodseq;
	result->options = options;
	result->sync_crc = crc;
	result->recentuid = recentuid;
	result->recenttime = recenttime;
	result->pop3_last_login = pop3_last_login;
	result->specialuse = xstrdupnull(specialuse);
	result->pop3_show_after = pop3_show_after;
	result->annots = annots; /* NOTE: not a copy! */

	result->mark = 0;
	result->reserve = 0;

	return(result);
	}

	struct sync_folder sync_folder_lookup(struct sync_folder_list l,
	const char *uniqueid)
	{
	struct sync_folder *p;

	for (p = l->head; p; p = p->next) {
	if (!strcmp(p->uniqueid, uniqueid))
	return p;
	}
	return NULL;
	}

	void sync_folder_list_free(struct sync_folder_list **lp)
	{
	struct sync_folder_list l = lp;
	struct sync_folder current, next;

	if (!l) return;

	current = l->head;
	while (current) {
	next = current->next;
	free(current->uniqueid);
	free(current->name);
	free(current->part);
	free(current->acl);
	free(current->specialuse);
	sync_annot_list_free(&current->annots);
	free(current);
	current = next;
	}
	free(l);
	*lp = NULL;
	}

	/* ====================================================================== */

	struct sync_rename_list *sync_rename_list_create(void)
	{
	struct sync_rename_list *l = xzmalloc(sizeof(struct sync_rename_list));

	l->head = NULL;
	l->tail = NULL;
	l->count = 0;
	l->done = 0;

	return(l);
	}

	struct sync_rename sync_rename_list_add(struct sync_rename_list l,
	const char uniqueid, const char oldname,
	const char newname, const char partition,
	unsigned uidvalidity)
	{
	struct sync_rename *result
	= xzmalloc(sizeof(struct sync_rename));

	if (l->tail)
	l->tail = l->tail->next = result;
	else
	l->head = l->tail = result;

	l->count++;

	result->next = NULL;
	result->uniqueid = xstrdup(uniqueid);
	result->oldname = xstrdup(oldname);
	result->newname = xstrdup(newname);
	result->part = xstrdup(partition);
	result->uidvalidity = uidvalidity;
	result->done = 0;

	return result;
	}

	struct sync_rename sync_rename_lookup(struct sync_rename_list l,
	const char *oldname)
	{
	struct sync_rename *p;

	for (p = l->head; p; p = p->next) {
	if (!strcmp(p->oldname, oldname))
	return p;
	}

	return NULL;
	}

	void sync_rename_list_free(struct sync_rename_list **lp)
	{
	struct sync_rename_list l = lp;
	struct sync_rename current, next;

	if (!l) return;

	current = l->head;
	while (current) {
	next = current->next;
	free(current->uniqueid);
	free(current->oldname);
	free(current->newname);
	free(current->part);
	free(current);
	current = next;
	}
	free(l);
	*lp = NULL;
	}

	/* ====================================================================== */

	struct sync_quota_list *sync_quota_list_create(void)
	{
	struct sync_quota_list *l = xzmalloc(sizeof(struct sync_quota_list));

	l->head = NULL;
	l->tail = NULL;
	l->count = 0;
	l->done = 0;

	return(l);
	}

	struct sync_quota sync_quota_list_add(struct sync_quota_list l,
	const char *root)
	{
	struct sync_quota *result
	= xzmalloc(sizeof(struct sync_quota));
	int res;

	if (l->tail)
	l->tail = l->tail->next = result;
	else
	l->head = l->tail = result;

	l->count++;

	result->next = NULL;
	result->root = xstrdup(root);
	for (res = 0 ; res < QUOTA_NUMRESOURCES ; res++)
	result->limits[res] = QUOTA_UNLIMITED;
	result->done = 0;

	return result;
	}

	struct sync_quota sync_quota_lookup(struct sync_quota_list l,
	const char *name)
	{
	struct sync_quota *p;

	for (p = l->head; p; p = p->next) {
	if (!strcmp(p->root, name))
	return p;
	}

	return NULL;
	}

	void sync_quota_list_free(struct sync_quota_list **lp)
	{
	struct sync_quota_list l = lp;
	struct sync_quota current, next;

	if (!l) return;

	current = l->head;
	while (current) {
	next = current->next;
	free(current->root);
	free(current);
	current = next;
	}
	free(l);
	*lp = NULL;
	}

	void sync_encode_quota_limits(struct dlist *kl, const int limits[QUOTA_NUMRESOURCES])
	{
	int res;

	/*
	* For backwards compatibility, we encode the STORAGE limit as LIMIT
	* and we always report it even if it's QUOTA_UNLIMITED. This is
	* kinda screwed up but should work. For QUOTA_UNLIMITED < 0, we
	* send a very large unsigned number across the wire, and parse it
	* back as QUOTA_UNLIMITED at the other end. Spit and string.
	*/
	dlist_setnum32(kl, "LIMIT", limits[QUOTA_STORAGE]);

	for (res = 0 ; res < QUOTA_NUMRESOURCES ; res++) {
	if (limits[res] >= 0)
	dlist_setnum32(kl, quota_names[res], limits[res]);
	}
	}

	void sync_decode_quota_limits(/const/ struct dlist *kl, int limits[QUOTA_NUMRESOURCES])
	{
	uint32_t limit = 0;
	int res;

	for (res = 0 ; res < QUOTA_NUMRESOURCES ; res++)
	limits[res] = QUOTA_UNLIMITED;

	/* For backwards compatibility */
	if (dlist_getnum32(kl, "LIMIT", &limit))
	limits[QUOTA_STORAGE] = limit;

	for (res = 0 ; res < QUOTA_NUMRESOURCES ; res++) {
	if (dlist_getnum32(kl, quota_names[res], &limit))
	limits[res] = limit;
	}
	}

	/* ====================================================================== */

	struct sync_sieve_list *sync_sieve_list_create(void)
	{
	struct sync_sieve_list *l = xzmalloc(sizeof (struct sync_sieve_list));

	l->head = NULL;
	l->tail = NULL;
	l->count = 0;

	return l;
	}

	void sync_sieve_list_add(struct sync_sieve_list l, const char name,
	time_t last_update, struct message_guid *guidp,
	int active)
	{
	struct sync_sieve *item = xzmalloc(sizeof(struct sync_sieve));

	item->name = xstrdup(name);
	item->last_update = last_update;
	item->active = active;
	message_guid_copy(&item->guid, guidp);
	item->mark = 0;

	if (l->tail)
	l->tail = l->tail->next = item;
	else
	l->head = l->tail = item;

	l->count++;
	}

	struct sync_sieve sync_sieve_lookup(struct sync_sieve_list l, const char *name)
	{
	struct sync_sieve *p;

	for (p = l->head; p; p = p->next) {
	if (!strcmp(p->name, name))
	return p;
	}

	return NULL;
	}

	void sync_sieve_list_set_active(struct sync_sieve_list l, const char name)
	{
	struct sync_sieve *item;

	for (item = l->head; item; item = item->next) {
	if (!strcmp(item->name, name)) {
	item->active = 1;
	break;
	}
	}
	}

	void sync_sieve_list_free(struct sync_sieve_list **lp)
	{
	struct sync_sieve_list l = lp;
	struct sync_sieve current, next;

	current = l->head;
	while (current) {
	next = current->next;
	free(current->name);
	free(current);
	current = next;
	}
	free(l);
	*lp = NULL;
	}

	struct sync_sieve_list sync_sieve_list_generate(const char userid)
	{
	struct sync_sieve_list *list = sync_sieve_list_create();
	const char *sieve_path = user_sieve_path(userid);
	char filename[2048];
	char active[2048];
	DIR *mbdir;
	struct dirent *next = NULL;
	struct stat sbuf;
	int count;

	mbdir = opendir(sieve_path);
	if (!mbdir) return list;

	active[0] = '\0';
	while((next = readdir(mbdir)) != NULL) {
	uint32_t size;
	char *result;
	struct message_guid guid;
	if (!strcmp(next->d_name, ".") \|\| !strcmp(next->d_name, ".."))
	continue;

	snprintf(filename, sizeof(filename), "%s/%s",
	sieve_path, next->d_name);

	if (stat(filename, &sbuf) < 0)
	continue;

	if (!strcmp(next->d_name, "defaultbc")) {
	if (sbuf.st_mode & S_IFLNK) {
	count = readlink(filename, active, 2047);

	if (count >= 0) {
	active[count] = '\0';
	} else {
	/* XXX Report problem? */
	}
	}
	continue;
	}

	/* calculate the sha1 on the fly, relatively cheap */
	result = sync_sieve_read(userid, next->d_name, &size);
	if (!result) continue;
	message_guid_generate(&guid, result, size);

	sync_sieve_list_add(list, next->d_name, sbuf.st_mtime, &guid, 0);
	free(result);
	}
	closedir(mbdir);

	if (active[0])
	sync_sieve_list_set_active(list, active);

	return list;
	}

	char sync_sieve_read(const char userid, const char name, uint32_t sizep)
	{
	const char *sieve_path = user_sieve_path(userid);
	char filename[2048];
	FILE *file;
	struct stat sbuf;
	char result, s;
	uint32_t count;
	int c;

	if (sizep)
	*sizep = 0;

	snprintf(filename, sizeof(filename), "%s/%s", sieve_path, name);

	file = fopen(filename, "r");
	if (!file) return NULL;

	if (fstat(fileno(file), &sbuf) < 0) {
	fclose(file);
	return(NULL);
	}

	count = sbuf.st_size;
	s = result = xmalloc(count+1);

	if (sizep)
	*sizep = count;

	while (count > 0) {
	if ((c=fgetc(file)) == EOF)
	break;
	*s++ = c;
	count--;
	}
	fclose(file);
	*s = '\0';

	return(result);
	}

	int sync_sieve_upload(const char userid, const char name,
	time_t last_update, const char *content,
	size_t len)
	{
	const char *sieve_path = user_sieve_path(userid);
	char tmpname[2048];
	char newname[2048];
	FILE *file;
	int r = 0;
	struct stat sbuf;
	struct utimbuf utimbuf;

	if (stat(sieve_path, &sbuf) == -1 && errno == ENOENT) {
	if (cyrus_mkdir(sieve_path, 0755) == -1) return IMAP_IOERROR;
	if (mkdir(sieve_path, 0755) == -1 && errno != EEXIST) {
	syslog(LOG_ERR, "Failed to create %s:%m", sieve_path);
	return IMAP_IOERROR;
	}
	}

	snprintf(tmpname, sizeof(tmpname), "%s/sync_tmp-%lu",
	sieve_path, (unsigned long)getpid());
	snprintf(newname, sizeof(newname), "%s/%s", sieve_path, name);

	if ((file=fopen(tmpname, "w")) == NULL) {
	return(IMAP_IOERROR);
	}

	/* XXX - error handling */
	fwrite(content, 1, len, file);

	if ((fflush(file) != 0) \|\| (fsync(fileno(file)) < 0))
	r = IMAP_IOERROR;

	fclose(file);

	utimbuf.actime = time(NULL);
	utimbuf.modtime = last_update;

	if (!r && (utime(tmpname, &utimbuf) < 0))
	r = IMAP_IOERROR;

	if (!r && (rename(tmpname, newname) < 0))
	r = IMAP_IOERROR;

	sync_log_sieve(userid);

	return r;
	}

	int sync_sieve_activate(const char userid, const char name)
	{
	const char *sieve_path = user_sieve_path(userid);
	char target[2048];
	char active[2048];

	snprintf(target, sizeof(target), "%s", name);
	snprintf(active, sizeof(active), "%s/%s", sieve_path, "defaultbc");
	unlink(active);

	if (symlink(target, active) < 0)
	return(IMAP_IOERROR);

	sync_log_sieve(userid);

	return(0);
	}

	int sync_sieve_deactivate(const char *userid)
	{
	const char *sieve_path = user_sieve_path(userid);
	char active[2048];

	snprintf(active, sizeof(active), "%s/%s", sieve_path, "defaultbc");
	unlink(active);

	sync_log_sieve(userid);

	return(0);
	}

	int sync_sieve_delete(const char userid, const char name)
	{
	const char *sieve_path = user_sieve_path(userid);
	char filename[2048];
	char active[2048];
	DIR *mbdir;
	struct dirent *next = NULL;
	struct stat sbuf;
	int is_default = 0;
	int count;

	if (!(mbdir = opendir(sieve_path)))
	return(IMAP_IOERROR);

	while((next = readdir(mbdir)) != NULL) {
	if(!strcmp(next->d_name, ".") \|\| !strcmp(next->d_name, ".."))
	continue;

	snprintf(filename, sizeof(filename), "%s/%s",
	sieve_path, next->d_name);

	if (stat(filename, &sbuf) < 0)
	continue;

	if (!strcmp(next->d_name, "defaultbc")) {
	if (sbuf.st_mode & S_IFLNK) {
	count = readlink(filename, active, 2047);

	if (count >= 0) {
	active[count] = '\0';
	if (!strcmp(active, name))
	is_default = 1;
	}
	}
	continue;
	}
	}
	closedir(mbdir);

	if (is_default) {
	snprintf(filename, sizeof(filename), "%s/defaultbc", sieve_path);
	unlink(filename);
	}

	snprintf(filename, sizeof(filename), "%s/%s", sieve_path, name);
	unlink(filename);

	sync_log_sieve(userid);

	return(0);
	}

	/* ====================================================================== */

	struct sync_name_list *sync_name_list_create(void)
	{
	struct sync_name_list *l = xzmalloc(sizeof (struct sync_name_list));
	l->head = NULL;
	l->tail = NULL;
	l->count = 0;
	l->marked = 0;
	return l;
	}

	struct sync_name sync_name_list_add(struct sync_name_list l,
	const char *name)
	{
	struct sync_name *item = xzmalloc(sizeof(struct sync_name));

	if (l->tail)
	l->tail = l->tail->next = item;
	else
	l->head = l->tail = item;

	l->count++;

	item->next = NULL;
	item->name = xstrdup(name);
	item->mark = 0;

	return item;
	}

	struct sync_name sync_name_lookup(struct sync_name_list l,
	const char *name)
	{
	struct sync_name *p;

	for (p = l->head; p; p = p->next)
	if (!strcmp(p->name, name))
	return p;

	return NULL;
	}

	void sync_name_list_free(struct sync_name_list **lp)
	{
	struct sync_name current, next;

	current = (*lp)->head;
	while (current) {
	next = current->next;
	free(current->name);
	free(current);
	current = next;
	}
	free(*lp);
	*lp = NULL;
	}

	/* ====================================================================== */

	struct sync_seen_list *sync_seen_list_create(void)
	{
	struct sync_seen_list *l = xzmalloc(sizeof (struct sync_seen_list));
	l->head = NULL;
	l->tail = NULL;
	l->count = 0;
	return l;
	}

	struct sync_seen sync_seen_list_add(struct sync_seen_list l,
	const char *uniqueid, time_t lastread,
	unsigned lastuid, time_t lastchange,
	const char *seenuids)
	{
	struct sync_seen *item = xzmalloc(sizeof(struct sync_seen));

	if (l->tail)
	l->tail = l->tail->next = item;
	else
	l->head = l->tail = item;

	l->count++;

	item->next = NULL;
	item->uniqueid = xstrdup(uniqueid);
	item->sd.lastread = lastread;
	item->sd.lastuid = lastuid;
	item->sd.lastchange = lastchange;
	item->sd.seenuids = xstrdup(seenuids);
	item->mark = 0;

	return item;
	}

	struct sync_seen sync_seen_list_lookup(struct sync_seen_list l,
	const char *uniqueid)
	{
	struct sync_seen *p;

	for (p = l->head; p; p = p->next)
	if (!strcmp(p->uniqueid, uniqueid))
	return p;

	return NULL;
	}

	void sync_seen_list_free(struct sync_seen_list **lp)
	{
	struct sync_seen current, next;

	current = (*lp)->head;
	while (current) {
	next = current->next;
	free(current->uniqueid);
	seen_freedata(&current->sd);
	free(current);
	current = next;
	}
	free(*lp);
	*lp = NULL;
	}

	/* ====================================================================== */

	struct sync_annot_list *sync_annot_list_create(void)
	{
	struct sync_annot_list *l = xzmalloc(sizeof (struct sync_annot_list));

	l->head = NULL;
	l->tail = NULL;
	l->count = 0;
	return(l);
	}

	void sync_annot_list_add(struct sync_annot_list *l,
	const char entry, const char userid,
	const struct buf *value)
	{
	struct sync_annot *item = xzmalloc(sizeof(struct sync_annot));

	item->entry = xstrdup(entry);
	item->userid = xstrdup(userid);
	buf_copy(&item->value, value);
	item->mark = 0;

	if (l->tail)
	l->tail = l->tail->next = item;
	else
	l->head = l->tail = item;

	l->count++;
	}

	void sync_annot_list_free(struct sync_annot_list **lp)
	{
	struct sync_annot_list l = lp;
	struct sync_annot current, next;

	if (!l)
	return;
	current = l->head;
	while (current) {
	next = current->next;
	if (current->entry) free(current->entry);
	if (current->userid) free(current->userid);
	buf_free(&current->value);
	free(current);
	current = next;
	}
	free(l);
	*lp = NULL;
	}

	/* ====================================================================== */

	struct sync_action_list *sync_action_list_create(void)
	{
	struct sync_action_list *l = xzmalloc(sizeof (struct sync_action_list));

	l->head = NULL;
	l->tail = NULL;
	l->count = 0;

	return(l);
	}

	void sync_action_list_add(struct sync_action_list *l,
	const char name, const char user)
	{
	struct sync_action *current;

	if (!name && !user) return;

	for (current = l->head ; current ; current = current->next) {
	if ((!name \|\| (current->name && !strcmp(current->name, name))) &&
	(!user \|\| (current->user && !strcmp(current->user, user)))) {
	current->active = 1; /* Make sure active */
	return;
	} else {
	/* name and/or user don't match current: no match possible */
	}
	}

	current = xzmalloc(sizeof(struct sync_action));
	current->next = NULL;
	current->name = xstrdupnull(name);
	current->user = xstrdupnull(user);
	current->active = 1;

	if (l->tail)
	l->tail = l->tail->next = current;
	else
	l->head = l->tail = current;

	l->count++;

	}

	void sync_action_list_free(struct sync_action_list **lp)
	{
	struct sync_action_list l = lp;
	struct sync_action current, next;

	current = l->head;
	while (current) {
	next = current->next;

	if (current->name) free(current->name);
	if (current->user) free(current->user);

	free(current);
	current = next;
	}
	free(l);
	*lp = NULL;
	}

	/* simple binary search */
	unsigned sync_mailbox_finduid(struct mailbox *mailbox, unsigned uid)
	{
	unsigned low=1, high=mailbox->i.num_records, mid;
	struct index_record record;

	while (low <= high) {
	mid = (high - low)/2 + low;
	if (mailbox_read_index_record(mailbox, mid, &record))
	return 0;

	if (record.uid == uid)
	return mid;
	else if (record.uid > uid)
	high = mid - 1;
	else
	low = mid + 1;
	}
	return 0;
	}

	int addmbox(char *name,
	int matchlen __attribute__((unused)),
	int maycreate __attribute__((unused)),
	void *rock)
	{
	struct sync_name_list list = (struct sync_name_list ) rock;
	struct mboxlist_entry *mbentry = NULL;

	if (mboxlist_lookup(name, &mbentry, NULL))
	return 0;

	/* only want normal mailboxes... */
	if (!(mbentry->mbtype & (MBTYPE_RESERVE \| MBTYPE_MOVING \| MBTYPE_REMOTE)))
	sync_name_list_add(list, name);

	mboxlist_entry_free(&mbentry);

	return 0;
	}

	int addmbox_sub(void rock, const char key, size_t keylen,
	const char *data __attribute__((unused)),
	size_t datalen __attribute__((unused)))
	{
	struct sync_name_list list = (struct sync_name_list ) rock;

	/* XXX - double malloc because of list_add, clean up later */
	char *name = xstrndup(key, keylen);
	sync_name_list_add(list, name);
	free(name);

	return 0;
	}

	/* NOTE - we don't prot_flush here, as we always send an OK at the
	* end of a response anyway */
	void sync_send_response(struct dlist kl, struct protstream out)
	{
	prot_printf(out, "* ");
	dlist_print(kl, 1, out);
	prot_printf(out, "\r\n");
	}

	/* these are one-shot commands for get and apply, so flush the stream
	* after sending */
	void sync_send_apply(struct dlist kl, struct protstream out)
	{
	prot_printf(out, "APPLY ");
	dlist_print(kl, 1, out);
	prot_printf(out, "\r\n");
	prot_flush(out);
	}

	void sync_send_lookup(struct dlist kl, struct protstream out)
	{
	prot_printf(out, "GET ");
	dlist_print(kl, 1, out);
	prot_printf(out, "\r\n");
	prot_flush(out);
	}

	void sync_send_set(struct dlist kl, struct protstream out)
	{
	prot_printf(out, "SET ");
	dlist_print(kl, 1, out);
	prot_printf(out, "\r\n");
	prot_flush(out);
	}

	struct dlist sync_parseline(struct protstream in)
	{
	struct dlist *dl = NULL;
	char c;

	c = dlist_parse(&dl, 1, in);

	/* end line - or fail */
	if (c == '\r') c = prot_getc(in);
	if (c == '\n') return dl;

	dlist_free(&dl);
	eatline(in, c);
	return NULL;
	}

	static int sync_send_file(struct mailbox *mailbox,
	struct index_record *record,
	struct sync_msgid_list *part_list,
	struct dlist *kupload)
	{
	struct sync_msgid *msgid = sync_msgid_insert(part_list, &record->guid);
	const char *fname;

	/* already uploaded, great */
	if (!msgid->need_upload)
	return 0;

	/* we'll trust that it exists - if not, we'll bail later,
	* but right now we're under locks, so be fast */
	fname = mailbox_message_fname(mailbox, record->uid);
	if (!fname) return IMAP_MAILBOX_BADNAME;

	dlist_setfile(kupload, "MESSAGE", mailbox->part,
	&record->guid, record->size, fname);

	/* note that we will be sending it, so it doesn't need to be
	* sent again */
	msgid->need_upload = 0;
	part_list->toupload--;

	return 0;
	}

	int sync_mailbox(struct mailbox *mailbox,
	struct sync_folder *remote,
	struct sync_msgid_list *part_list,
	struct dlist kl, struct dlist kupload,
	int printrecords)
	{
	int r = 0;

	dlist_setatom(kl, "UNIQUEID", mailbox->uniqueid);
	dlist_setatom(kl, "MBOXNAME", mailbox->name);
	dlist_setnum32(kl, "LAST_UID", mailbox->i.last_uid);
	dlist_setnum64(kl, "HIGHESTMODSEQ", mailbox->i.highestmodseq);
	dlist_setnum32(kl, "RECENTUID", mailbox->i.recentuid);
	dlist_setdate(kl, "RECENTTIME", mailbox->i.recenttime);
	dlist_setdate(kl, "LAST_APPENDDATE", mailbox->i.last_appenddate);
	dlist_setdate(kl, "POP3_LAST_LOGIN", mailbox->i.pop3_last_login);
	dlist_setdate(kl, "POP3_SHOW_AFTER", mailbox->i.pop3_show_after);
	dlist_setnum32(kl, "UIDVALIDITY", mailbox->i.uidvalidity);
	dlist_setatom(kl, "PARTITION", mailbox->part);
	dlist_setatom(kl, "ACL", mailbox->acl);
	dlist_setatom(kl, "OPTIONS", sync_encode_options(mailbox->i.options));
	dlist_setnum32(kl, "SYNC_CRC", sync_crc_calc(mailbox, /force/0));
	if (mailbox->quotaroot)
	dlist_setatom(kl, "QUOTAROOT", mailbox->quotaroot);
	if (mailbox->specialuse)
	dlist_setatom(kl, "SPECIALUSE", mailbox->specialuse);

	if (printrecords) {
	struct index_record record;
	struct dlist *il;
	struct dlist *rl = dlist_newlist(kl, "RECORD");
	uint32_t recno;
	int send_file;
	uint32_t prevuid = 0;
	struct sync_annot_list *annots = NULL;

	for (recno = 1; recno <= mailbox->i.num_records; recno++) {
	/* we can't send bogus records */
	if (mailbox_read_index_record(mailbox, recno, &record)) {
	syslog(LOG_ERR, "SYNCERROR: corrupt mailbox %s %u, IOERROR",
	mailbox->name, recno);
	return IMAP_IOERROR;
	}

	if (record.uid <= prevuid) {
	syslog(LOG_ERR, "SYNCERROR: corrupt mailbox %s %u, ordering",
	mailbox->name, recno);
	return IMAP_IOERROR;
	}
	prevuid = record.uid;

	/* start off thinking we're sending the file too */
	send_file = 1;

	/* seen it already! SKIP */
	if (remote && record.modseq <= remote->highestmodseq)
	continue;

	/* does it exist at the other end? Don't send it */
	if (remote && record.uid <= remote->last_uid)
	send_file = 0;

	/* if we're not uploading messages... don't send file */
	if (!part_list \|\| !kupload)
	send_file = 0;

	/* if we don't HAVE the file we can't send it */
	if (record.system_flags & FLAG_UNLINKED)
	send_file = 0;

	if (send_file) {
	r = sync_send_file(mailbox, &record, part_list, kupload);
	if (r) goto done;
	}

	il = dlist_newkvlist(rl, "RECORD");
	dlist_setnum32(il, "UID", record.uid);
	dlist_setnum64(il, "MODSEQ", record.modseq);
	dlist_setdate(il, "LAST_UPDATED", record.last_updated);
	sync_print_flags(il, mailbox, &record);
	dlist_setdate(il, "INTERNALDATE", record.internaldate);
	dlist_setnum32(il, "SIZE", record.size);
	dlist_setatom(il, "GUID", message_guid_encode(&record.guid));

	r = read_annotations(mailbox, &record, &annots);
	if (r) goto done;

	if (annots) {
	encode_annotations(il, annots);
	sync_annot_list_free(&annots);
	}
	}

	r = read_annotations(mailbox, NULL, &annots);
	if (r) goto done;

	if (annots) {
	encode_annotations(kl, annots);
	sync_annot_list_free(&annots);
	}
	}

	done:
	return r;
	}

	int sync_parse_response(const char cmd, struct protstream in,
	struct dlist **klp)
	{
	static struct buf response; /* BSS */
	static struct buf errmsg;
	struct dlist *kl = NULL;
	int c;

	if ((c = getword(in, &response)) == EOF) {
	syslog(LOG_ERR, "IOERROR: zero length response to %s (%s)",
	cmd, prot_error(in));
	return IMAP_PROTOCOL_ERROR;
	}

	if (c != ' ') goto parse_err;

	kl = dlist_newlist(NULL, cmd);
	while (!strcmp(response.s, "*")) {
	struct dlist *item = sync_parseline(in);
	if (!item) goto parse_err;
	dlist_stitch(kl, item);
	if ((c = getword(in, &response)) == EOF)
	goto parse_err;
	}

	if (!strcmp(response.s, "OK")) {
	if (klp) *klp = kl;
	else dlist_free(&kl);
	eatline(in, c);
	return 0;
	}
	if (!strcmp(response.s, "NO")) {
	dlist_free(&kl);
	sync_getline(in, &errmsg);
	syslog(LOG_ERR, "%s received NO response: %s", cmd, errmsg.s);

	/* Slight hack to transform certain error strings into equivalent
	* imap_err value so that caller has some idea of cause. Match
	* this to the logic at print_response in sync_server */
	if (!strncmp(errmsg.s, "IMAP_INVALID_USER ",
	strlen("IMAP_INVALID_USER ")))
	return IMAP_INVALID_USER;
	else if (!strncmp(errmsg.s, "IMAP_MAILBOX_NONEXISTENT ",
	strlen("IMAP_MAILBOX_NONEXISTENT ")))
	return IMAP_MAILBOX_NONEXISTENT;
	else if (!strncmp(errmsg.s, "IMAP_SYNC_CHECKSUM ",
	strlen("IMAP_SYNC_CHECKSUM ")))
	return IMAP_SYNC_CHECKSUM;
	else if (!strncmp(errmsg.s, "IMAP_PROTOCOL_ERROR ",
	strlen("IMAP_PROTOCOL_ERROR ")))
	return IMAP_PROTOCOL_ERROR;
	else if (!strncmp(errmsg.s, "IMAP_PROTOCOL_BAD_PARAMETERS ",
	strlen("IMAP_PROTOCOL_BAD_PARAMETERS ")))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	else
	return IMAP_REMOTE_DENIED;
	}

	parse_err:
	dlist_free(&kl);
	sync_getline(in, &errmsg);
	syslog(LOG_ERR, "IOERROR: %s received %s response: %s",
	cmd, response.s, errmsg.s);
	return IMAP_PROTOCOL_ERROR;
	}

	int sync_append_copyfile(struct mailbox *mailbox,
	struct index_record *record,
	const struct sync_annot_list *annots)
	{
	const char fname, destname;
	struct message_guid tmp_guid;
	int r;

	message_guid_copy(&tmp_guid, &record->guid);

	fname = dlist_reserve_path(mailbox->part, &tmp_guid);
	if (!fname) {
	r = IMAP_IOERROR;
	syslog(LOG_ERR, "IOERROR: Failed to reserve file %s",
	message_guid_encode(&tmp_guid));
	return r;
	}

	r = message_parse(fname, record);
	if (r) {
	/* deal with unlinked master records */
	if (record->system_flags & FLAG_EXPUNGED) {
	record->system_flags \|= FLAG_UNLINKED;
	goto just_write;
	}
	syslog(LOG_ERR, "IOERROR: failed to parse %s", fname);
	return r;
	}

	if (!message_guid_equal(&tmp_guid, &record->guid)) {
	syslog(LOG_ERR, "IOERROR: guid mismatch on parse %s (%s)",
	fname, message_guid_encode(&record->guid));
	return IMAP_IOERROR;
	}

	destname = mailbox_message_fname(mailbox, record->uid);
	cyrus_mkdir(destname, 0755);
	r = mailbox_copyfile(fname, destname, 0);
	if (r) {
	syslog(LOG_ERR, "IOERROR: Failed to copy %s to %s",
	fname, destname);
	return r;
	}

	/* apply the remote annotations */
	r = apply_annotations(mailbox, record, NULL, annots, 0);
	if (r) {
	syslog(LOG_ERR, "Failed to apply annotations: %s",
	error_message(r));
	return r;
	}

	just_write:
	return mailbox_append_index_record(mailbox, record);
	}

	/* ====================================================================== */

	static int read_one_annot(const char *mailbox __attribute__((unused)),
	uint32_t uid __attribute__((unused)),
	const char *entry,
	const char *userid,
	const struct buf *value,
	void *rock)
	{
	struct sync_annot_list salp = (struct sync_annot_list )rock;

	if (!*salp)
	*salp = sync_annot_list_create();
	sync_annot_list_add(*salp, entry, userid, value);
	return 0;
	}

	/*
	* Read all the annotations in the local annotations database
	* for the message given by @mailbox and @record, returning them
	* as a new sync_annot_list. The caller should free the new
	* list with sync_annot_list_free().
	* If record is NULL, return the mailbox annotations
	*
	* Returns: non-zero on error,
	* resulting sync_annot_list in *@resp
	*/
	int read_annotations(const struct mailbox *mailbox,
	const struct index_record *record,
	struct sync_annot_list **resp)
	{
	*resp = NULL;
	return annotatemore_findall(mailbox->name, record ? record->uid : 0,
	/* all entries/"",
	read_one_annot, (void *)resp);
	}

	/*
	* Encode the given list of annotations @sal as a dlist
	* structure with the given @parent.
	*/
	void encode_annotations(struct dlist *parent,
	const struct sync_annot_list *sal)
	{
	const struct sync_annot *sa;
	struct dlist *annots = NULL;
	struct dlist *aa;

	if (!sal)
	return;
	for (sa = sal->head ; sa ; sa = sa->next) {
	if (!annots)
	annots = dlist_newlist(parent, "ANNOTATIONS");

	aa = dlist_newkvlist(annots, "A");
	dlist_setatom(aa, "ENTRY", sa->entry);
	dlist_setatom(aa, "USERID", sa->userid);
	dlist_setmap(aa, "VALUE", sa->value.s, sa->value.len);
	}
	}

	/*
	* Decode the given list of encoded annotations @annots and create
	* a new sync_annot_list in *@salp, which the caller should free
	* with sync_annot_list_free().
	*
	* Returns: zero on success or Cyrus error code.
	*/
	int decode_annotations(/const/struct dlist *annots,
	struct sync_annot_list **salp)
	{
	struct dlist *aa;
	const char *entry;
	const char *userid;
	const char *v;
	size_t l;
	struct buf value = BUF_INITIALIZER;

	*salp = NULL;
	if (strcmp(annots->name, "ANNOTATIONS"))
	return IMAP_PROTOCOL_BAD_PARAMETERS;

	for (aa = annots->head ; aa ; aa = aa->next) {
	if (!*salp)
	*salp = sync_annot_list_create();
	if (!dlist_getatom(aa, "ENTRY", &entry))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getatom(aa, "USERID", &userid))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	if (!dlist_getmap(aa, "VALUE", &v, &l))
	return IMAP_PROTOCOL_BAD_PARAMETERS;
	buf_init_ro(&value, v, l);
	sync_annot_list_add(*salp, entry, userid, &value);
	}
	return 0;
	}

	/*
	* Merge a local and remote list of annotations, and apply the resulting
	* list of annotations to the local annotation database, storing new values
	* or deleting old values as necessary. Manages its own annotations
	* transaction.
	* Record may be null, to process mailbox annotations.
	*/

	static int diff_annotation(const struct sync_annot *a,
	const struct sync_annot *b,
	int diff_value)
	{
	int diff = 0;

	if (!a && !b) return 0;

	if (a)
	diff--;
	if (b)
	diff++;

	if (!diff)
	diff = strcmp(a->entry, b->entry);
	if (!diff)
	diff = strcmp(a->userid, b->userid);
	if (!diff && diff_value)
	diff = buf_cmp(&a->value, &b->value);

	return diff;
	}

	int diff_annotations(const struct sync_annot_list *local_annots,
	const struct sync_annot_list *remote_annots)
	{
	const struct sync_annot *local = (local_annots ? local_annots->head : NULL);
	const struct sync_annot *remote = (remote_annots ? remote_annots->head : NULL);
	while (local \|\| remote) {
	int r = diff_annotation(local, remote, 1);
	if (r) return r;
	if (local) local = local->next;
	if (remote) remote = remote->next;
	}

	return 0;
	}

	int apply_annotations(struct mailbox *mailbox,
	const struct index_record *record,
	const struct sync_annot_list *local_annots,
	const struct sync_annot_list *remote_annots,
	int local_wins)
	{
	const struct sync_annot *local = (local_annots ? local_annots->head : NULL);
	const struct sync_annot *remote = (remote_annots ? remote_annots->head : NULL);
	const struct sync_annot *chosen;
	static const struct buf novalue = BUF_INITIALIZER;
	const struct buf *value;
	int r = 0;
	int diff;
	annotate_state_t *astate = NULL;

	if (record) {
	r = mailbox_get_annotate_state(mailbox, record->uid, &astate);
	}
	else {
	astate = annotate_state_new();
	r = annotate_state_set_mailbox(astate, mailbox);
	}
	if (r) goto out;

	/*
	* We rely here on the database scan order resulting in lists
	* of annotations that are ordered lexically on entry then userid.
	* We walk over both lists at once, choosing an annotation from
	* either the local list only (diff < 0), the remote list only
	* (diff > 0), or both lists (diff == 0).
	*/
	while (local \|\| remote) {
	diff = diff_annotation(local, remote, 0);
	chosen = 0;
	if (diff < 0) {
	chosen = local;
	value = (local_wins ? &local->value : &novalue);
	local = local->next;
	}
	else if (diff > 0) {
	chosen = remote;
	value = (local_wins ? &novalue : &remote->value);
	remote = remote->next;
	}
	else {
	chosen = remote;
	value = (local_wins ? &local->value : &remote->value);
	diff = buf_cmp(&local->value, &remote->value);
	local = local->next;
	remote = remote->next;
	if (!diff)
	continue; /* same value, skip */
	}

	r = annotate_state_write(astate, chosen->entry,
	chosen->userid, value);
	if (r)
	break;
	}

	out:
	if (!record) {
	/* need to manage our own txn for the global db */
	if (!r)
	r = annotate_state_commit(&astate);
	else
	annotate_state_abort(&astate);
	}
	/* else, the struct mailbox manages it for us */

	return r;
	}

	/* ====================================================================== */

	static unsigned sync_crc_vers;

	int sync_crc_setup(unsigned minvers, unsigned maxvers, int strict)
	{
	sync_crc_vers = mailbox_best_crcvers(minvers, maxvers);
	if (strict) {
	if (sync_crc_vers < minvers \|\| sync_crc_vers > maxvers) {
	syslog(LOG_ERR, "IOERROR: failed to negotiate CRC: %u (%u %u)",
	sync_crc_vers, minvers, maxvers);
	return IMAP_PROTOCOL_ERROR;
	}
	}

	return sync_crc_vers;
	}

	uint32_t sync_crc_calc(struct mailbox *mailbox, int force)
	{
	return mailbox_sync_crc(mailbox, sync_crc_vers, force);
	}

	/* ====================================================================== */

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