uid.c 15.4 KB
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/**
 * \file uid.c -- UIDL handling for POP3 servers without LAST
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 *
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 * For license terms, see the file COPYING in this directory.
 */

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#include "config.h"
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#include <sys/stat.h>
#include <errno.h>
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#include <stdio.h>
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#include <limits.h>
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#if defined(STDC_HEADERS)
#include <stdlib.h>
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#include <string.h>
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#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif

#include "fetchmail.h"
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#include "i18n.h"
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#include "sdump.h"
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/*
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 * Machinery for handling UID lists live here.  This is currently used
 * by POP3, but may also be useful for making the IMAP4 querying logic
 * UID-oriented.
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 *
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 * These functions are also used by the rest of the code to maintain
 * string lists.
 *
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 * Here's the theory:
 *
 * At start of a query, we have a (possibly empty) list of UIDs to be
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 * considered seen in `oldsaved'.  These are messages that were left in
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 * the mailbox and *not deleted* on previous queries (we don't need to
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 * remember the UIDs of deleted messages because ... well, they're gone!)
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 * This list is initially set up by initialize_saved_list() from the
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 * .fetchids file.
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 *
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 * Early in the query, during the execution of the protocol-specific
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 * getrange code, the driver expects that the host's `newsaved' member
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 * will be filled with a list of UIDs and message numbers representing
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 * the mailbox state.  If this list is empty, the server did
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 * not respond to the request for a UID listing.
 *
 * Each time a message is fetched, we can check its UID against the
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 * `oldsaved' list to see if it is old.
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 *
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 * Each time a message-id is seen, we mark it with MARK_SEEN.
 *
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 * Each time a message is deleted, we mark its id UID_DELETED in the
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 * `newsaved' member.  When we want to assert that an expunge has been
 * done on the server, we call expunge_uid() to register that all
 * deleted messages are gone by marking them UID_EXPUNGED.
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 *
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 * At the end of the query, the `newsaved' member becomes the
 * `oldsaved' list.  The old `oldsaved' list is freed.
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 *
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 * At the end of the fetchmail run, seen and non-EXPUNGED members of all
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 * current `oldsaved' lists are flushed out to the .fetchids file to
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 * be picked up by the next run.  If there are no un-expunged
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 * messages, the file is deleted.
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 *
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 * One disadvantage of UIDL is that all the UIDs have to be downloaded
 * before a search for new messages can be done. Typically, new messages
 * are appended to mailboxes. Hence, downloading all UIDs just to download
 * a few new mails is a waste of bandwidth. If new messages are always at
 * the end of the mailbox, fast UIDL will decrease the time required to
 * download new mails.
 *
 * During fast UIDL, the UIDs of all messages are not downloaded! The first
 * unseen message is searched for by using a binary search on UIDs. UIDs
 * after the first unseen message are downloaded as and when needed.
 *
 * The advantages of fast UIDL are (this is noticeable only when the
 * mailbox has too many mails):
 *
 * - There is no need to download the UIDs of all mails right at the start.
 * - There is no need to save all the UIDs in memory separately in
 * `newsaved' list.
 * - There is no need to download the UIDs of seen mail (except for the
 * first binary search).
 * - The first new mail is downloaded considerably faster.
 *
 * The disadvantages are:
 *
 * - Since all UIDs are not downloaded, it is not possible to swap old and
 * new list. The current state of the mailbox is essentially a merged state
 * of old and new mails.
 * - If an intermediate mail has been temporarily refused (say, due to 4xx
 * code from the smtp server), this mail may not get downloaded.
 * - If 'flush' is used, such intermediate mails will also get deleted.
 *
 * The first two disadvantages can be overcome by doing a linear search
 * once in a while (say, every 10th poll). Also, with flush, fast UIDL
 * should be disabled.
 *
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 * Note: some comparisons (those used for DNS address lists) are caseblind!
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 */

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int dofastuidl = 0;

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#ifdef POP3_ENABLE
/** UIDs associated with un-queried hosts */
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static struct idlist *scratchlist;

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/** Read saved IDs from \a idfile and attach to each host in \a hostlist. */
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static int dump_saved_uid(struct uid_db_record *rec, void *unused)
{
    char *t;

    (void)unused;

    t = sdump(rec->id, rec->id_len);
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    report_build(stdout, " %s\n", t);
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    free(t);

    return 0;
}

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/** Read saved IDs from \a idfile and attach to each host in \a hostlist. */
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void initialize_saved_lists(struct query *hostlist, const char *idfile)
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{
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    struct stat statbuf;
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    FILE	*tmpfp;
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    struct query *ctl;
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    /* make sure lists are initially empty */
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    for (ctl = hostlist; ctl; ctl = ctl->next) {
	ctl->skipped = (struct idlist *)NULL;
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	init_uid_db(&ctl->oldsaved);
	init_uid_db(&ctl->newsaved);
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    }
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    errno = 0;

    /*
     * Croak if the uidl directory does not exist.
     * This probably means an NFS mount failed and we can't
     * see a uidl file that ought to be there.
     * Question: is this a portable check? It's not clear
     * that all implementations of lstat() will return ENOTDIR
     * rather than plain ENOENT in this case...
     */
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    if (lstat(idfile, &statbuf) < 0) {
	if (errno == ENOTDIR)
	{
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	    report(stderr, "lstat: %s: %s\n", idfile, strerror(errno));
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	    exit(PS_IOERR);
	}
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    }

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    /* let's get stored message UIDs from previous queries */
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    if ((tmpfp = fopen(idfile, "r")) != (FILE *)NULL)
    {
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	char buf[POPBUFSIZE+1];
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	char *host = NULL;	/* pacify -Wall */
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	char *user;
	char *id;
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	char *atsign;	/* temp pointer used in parsing user and host */
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	char *delimp1;
	char saveddelim1;
	char *delimp2;
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	char saveddelim2 = '\0';	/* pacify -Wall */
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	while (fgets(buf, POPBUFSIZE, tmpfp) != (char *)NULL)
	{
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	    /*
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	     * At this point, we assume the bug has two fields -- a user@host
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	     * part, and an ID part. Either field may contain spurious @ signs.
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	     * The previous version of this code presumed one could split at
	     * the rightmost '@'.  This is not correct, as InterMail puts an
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	     * '@' in the UIDL.
	     */
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	    /* first, skip leading spaces */
	    user = buf + strspn(buf, " \t");
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	    /*
	     * First, we split the buf into a userhost part and an id
	     * part ... but id doesn't necessarily start with a '<',
	     * espescially if the POP server returns an X-UIDL header
	     * instead of a Message-ID, as GMX's (www.gmx.net) POP3
	     * StreamProxy V1.0 does.
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	     *
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	     * this is one other trick. The userhost part
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	     * may contain ' ' in the user part, at least in
	     * the lotus notes case.
	     * So we start looking for the '@' after which the
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	     * host will follow with the ' ' separator with the id.
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	     *
	     * XXX FIXME: There is a case this code cannot handle:
	     * the user name cannot have blanks after a '@'.
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	     */
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	    if ((delimp1 = strchr(user, '@')) != NULL &&
		(id = strchr(delimp1,' ')) != NULL)
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	    {
	        for (delimp1 = id; delimp1 >= user; delimp1--)
		    if ((*delimp1 != ' ') && (*delimp1 != '\t'))
			break;
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		/*
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		 * It should be safe to assume that id starts after
		 * the " " - after all, we're writing the " "
		 * ourselves in write_saved_lists() :-)
		 */
		id = id + strspn(id, " ");

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		delimp1++; /* but what if there is only white space ?!? */
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		/* we have at least one @, else we are not in this branch */
		saveddelim1 = *delimp1;		/* save char after token */
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		*delimp1 = '\0';		/* delimit token with \0 */
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		/* now remove trailing white space chars from id */
		if ((delimp2 = strpbrk(id, " \t\n")) != NULL ) {
		    saveddelim2 = *delimp2;
		    *delimp2 = '\0';
		}

		atsign = strrchr(user, '@');
		/* we have at least one @, else we are not in this branch */
		*atsign = '\0';
		host = atsign + 1;

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		/* find uidl db and save it */
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		for (ctl = hostlist; ctl; ctl = ctl->next) {
		    if (strcasecmp(host, ctl->server.queryname) == 0
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			    && strcasecmp(user, ctl->remotename) == 0) {
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			uid_db_insert(&ctl->oldsaved, id, UID_SEEN);
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			break;
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		    }
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		}
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		/*
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		 * If it's not in a host we're querying,
		 * save it anyway.  Otherwise we'd lose UIDL
		 * information any time we queried an explicit
		 * subset of hosts.
		 */
		if (ctl == (struct query *)NULL) {
		    /* restore string */
		    *delimp1 = saveddelim1;
		    *atsign = '@';
		    if (delimp2 != NULL) {
			*delimp2 = saveddelim2;
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		    }
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		    save_str(&scratchlist, buf, UID_SEEN);
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		}
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	    }
	}
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	fclose(tmpfp);	/* not checking should be safe, mode was "r" */
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    }
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    if (outlevel >= O_DEBUG)
    {
	struct idlist	*idp;

	for (ctl = hostlist; ctl; ctl = ctl->next)
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	    {
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		report_build(stdout, GT_("Old UID list from %s:\n"),
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			     ctl->server.pollname);
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		if (!uid_db_n_records(&ctl->oldsaved))
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		    report_build(stdout, "%s\n", GT_(" <empty>"));
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		else
		    traverse_uid_db(&ctl->oldsaved, dump_saved_uid, NULL);

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		report_complete(stdout, "\n");
	    }

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	report_build(stdout, GT_("Scratch list of UIDs:\n"));
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	if (!scratchlist)
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		report_build(stdout, "%s\n", GT_(" <empty>"));
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	else for (idp = scratchlist; idp; idp = idp->next) {
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		char *t = sdump(idp->id, strlen(idp->id)-1);
		report_build(stdout, " %s\n", t);
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		free(t);
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	}
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	report_complete(stdout, "\n");
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    }
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}
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/** Assert that all UIDs marked deleted in query \a ctl have actually been
expunged. */
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static int mark_as_expunged_if(struct uid_db_record *rec, void *unused)
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{
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    (void)unused;
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    if (rec->status == UID_DELETED) rec->status = UID_EXPUNGED;
    return 0;
}

void expunge_uids(struct query *ctl)
{
    traverse_uid_db(dofastuidl ? &ctl->oldsaved : &ctl->newsaved,
		     mark_as_expunged_if, NULL);
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}

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static const char *str_uidmark(int mark)
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{
	static char buf[20];

	switch(mark) {
		case UID_UNSEEN:
			return "UNSEEN";
		case UID_SEEN:
			return "SEEN";
		case UID_EXPUNGED:
			return "EXPUNGED";
		case UID_DELETED:
			return "DELETED";
		default:
			if (snprintf(buf, sizeof(buf), "MARK=%d", mark) < 0)
				return "ERROR";
			else
				return buf;
	}
}

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static int dump_uid_db_record(struct uid_db_record *rec, void *arg)
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{
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	unsigned *n_recs;
	char *t;

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	n_recs = (unsigned int *)arg;
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	--*n_recs;

	t = sdump(rec->id, rec->id_len);
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	report_build(stdout, " %s = %s\n", t, str_uidmark(rec->status));
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	free(t);

	return 0;
}

static void dump_uid_db(struct uid_db *db)
{
	unsigned n_recs;

	n_recs = uid_db_n_records(db);
	if (!n_recs) {
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		report_build(stdout, GT_(" <empty>"));
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		return;
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	}
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	traverse_uid_db(db, dump_uid_db_record, &n_recs);
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}

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/** Finish a successful query */
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void uid_swap_lists(struct query *ctl)
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{
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    /* debugging code */
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    if (outlevel >= O_DEBUG)
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    {
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	if (dofastuidl) {
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	    report_build(stdout, GT_("Merged UID list from %s:\n"), ctl->server.pollname);
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	    dump_uid_db(&ctl->oldsaved);
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	} else {
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	    report_build(stdout, GT_("New UID list from %s:\n"), ctl->server.pollname);
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	    dump_uid_db(&ctl->newsaved);
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	}
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	report_complete(stdout, "\n");
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    }
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    /*
     * Don't swap UID lists unless we've actually seen UIDLs.
     * This is necessary in order to keep UIDL information
     * from being heedlessly deleted later on.
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     *
     * Older versions of fetchmail did
     *
     *     free_str_list(&scratchlist);
     *
     * after swap.  This was wrong; we need to preserve the UIDL information
     * from unqueried hosts.  Unfortunately, not doing this means that
     * under some circumstances UIDLs can end up being stored forever --
     * specifically, if a user description is removed from .fetchmailrc
     * with UIDLs from that account in .fetchids, there is no way for
     * them to ever get garbage-collected.
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     */
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    if (uid_db_n_records(&ctl->newsaved))
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    {
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	swap_uid_db_data(&ctl->newsaved, &ctl->oldsaved);
	clear_uid_db(&ctl->newsaved);
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    }
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    /* in fast uidl, there is no need to swap lists: the old state of
     * mailbox cannot be discarded! */
    else if (outlevel >= O_DEBUG && !dofastuidl)
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	report(stdout, GT_("not swapping UID lists, no UIDs seen this query\n"));
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}

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/** Finish a query which had errors */
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void uid_discard_new_list(struct query *ctl)
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{
    /* debugging code */
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    if (outlevel >= O_DEBUG)
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    {
	/* this is now a merged list! the mails which were seen in this
	 * poll are marked here. */
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	report_build(stdout, GT_("Merged UID list from %s:\n"), ctl->server.pollname);
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	dump_uid_db(&ctl->oldsaved);
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	report_complete(stdout, "\n");
    }

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    if (uid_db_n_records(&ctl->newsaved))
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    {
	/* new state of mailbox is not reliable */
	if (outlevel >= O_DEBUG)
	    report(stdout, GT_("discarding new UID list\n"));
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	clear_uid_db(&ctl->newsaved);
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    }
}

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/** Reset the number associated with each id */
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void uid_reset_num(struct query *ctl)
{
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    reset_uid_db_nums(&ctl->oldsaved);
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}

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/** Write list of seen messages, at end of run. */
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static int count_seen_deleted(struct uid_db_record *rec, void *arg)
{
    if (rec->status == UID_SEEN || rec->status == UID_DELETED)
	++*(long *)arg;
    return 0;
}

struct write_saved_info {
    struct query *ctl;
    FILE *fp;
};

static int write_uid_db_record(struct uid_db_record *rec, void *arg)
{
    struct write_saved_info *info;
    int rc;

    if (!(rec->status == UID_SEEN || rec->status == UID_DELETED))
	return 0;

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    info = (struct write_saved_info *)arg;
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    rc = fprintf(info->fp, "%s@%s %s\n",
		 info->ctl->remotename, info->ctl->server.queryname,
		 rec->id);
    return rc < 0 ? -1 : 0;
}

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/** Write new list of UIDs (state) to \a idfile. */
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void write_saved_lists(struct query *hostlist, const char *idfile)
{
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    long	idcount;
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    FILE	*tmpfp;
    struct query *ctl;
    struct idlist *idp;
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    /* if all lists are empty, nuke the file */
    idcount = 0;
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    for (ctl = hostlist; ctl; ctl = ctl->next)
	traverse_uid_db(&ctl->oldsaved, count_seen_deleted, &idcount);
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    /* either nuke the file or write updated last-seen IDs */
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    if (!idcount && !scratchlist)
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    {
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	if (outlevel >= O_DEBUG) {
	    if (access(idfile, F_OK) == 0)
		    report(stdout, GT_("Deleting fetchids file.\n"));
	}
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	if (unlink(idfile) && errno != ENOENT)
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	    report(stderr, GT_("Error deleting %s: %s\n"), idfile, strerror(errno));
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    } else {
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	char *newnam = (char *)xmalloc(strlen(idfile) + 2);
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	mode_t old_umask;
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	strcpy(newnam, idfile);
	strcat(newnam, "_");
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	if (outlevel >= O_DEBUG)
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	    report(stdout, GT_("Writing fetchids file.\n"));
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	(void)unlink(newnam); /* remove file/link first */
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	old_umask = umask(S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH | S_IXOTH);
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	if ((tmpfp = fopen(newnam, "w")) != (FILE *)NULL) {
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	    struct write_saved_info info;
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	    int errflg = 0;
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	    info.fp = tmpfp;

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	    for (ctl = hostlist; ctl; ctl = ctl->next) {
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		info.ctl = ctl;

		if (traverse_uid_db(&ctl->oldsaved, write_uid_db_record, &info) < 0) {
		    int e = errno;
		    report(stderr, GT_("Write error on fetchids file %s: %s\n"), newnam, strerror(e));
		    errflg = 1;
		    goto bailout;
		}
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	    }
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	    for (idp = scratchlist; idp; idp = idp->next)
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		if (EOF == fputs(idp->id, tmpfp)) {
			    int e = errno;
			    report(stderr, GT_("Write error on fetchids file %s: %s\n"), newnam, strerror(e));
			    errflg = 1;
			    goto bailout;
		}

bailout:
	    (void)fflush(tmpfp); /* return code ignored, we check ferror instead */
	    errflg |= ferror(tmpfp);
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	    errflg |= fclose(tmpfp);
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	    /* if we could write successfully, move into place;
	     * otherwise, drop */
	    if (errflg) {
		report(stderr, GT_("Error writing to fetchids file %s, old file left in place.\n"), newnam);
		unlink(newnam);
	    } else {
		if (rename(newnam, idfile)) {
		    report(stderr, GT_("Cannot rename fetchids file %s to %s: %s\n"), newnam, idfile, strerror(errno));
		}
	    }
	} else {
	    report(stderr, GT_("Cannot open fetchids file %s for writing: %s\n"), newnam, strerror(errno));
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	}
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	free(newnam);
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	(void)umask(old_umask);
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    }
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}
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#endif /* POP3_ENABLE */
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/* uid.c ends here */