maildirquota.c

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/*
 * $Id: maildirquota.c,v 1.7 2003/12/19 05:16:36 tomcollins Exp $
 * Copyright (C) 1999-2003 Inter7 Internet Technologies, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *
 */

/* include files */
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <time.h>
#include <sys/uio.h>
#include "vauth.h"
#include "vpopmail.h"
#include "vlimits.h"
#include "maildirquota.h"
#include "config.h"

/* private functions - no name clashes with courier */
static char *makenewmaildirsizename(const char *, int *);
static int countcurnew(const char *, time_t *, off_t *, unsigned *);
static int countsubdir(const char *, const char *,
		time_t *, off_t *, unsigned *);
static int statcurnew(const char *, time_t *);
static int statsubdir(const char *, const char *, time_t *);
static int doaddquota(const char *, int, const char *, long, int, int);
static int docheckquota(const char *dir, int *maildirsize_fdptr,
	const char *quota_type, long xtra_size, int xtra_cnt, int *percentage);
static int docount(const char *, time_t *, off_t *, unsigned *);
static int maildir_checkquota(const char *dir, int *maildirsize_fdptr,
	const char *quota_type, long xtra_size, int xtra_cnt);
static int maildir_addquota(const char *dir, int maildirsize_fd,
	const char *quota_type, long maildirsize_size, int maildirsize_cnt);
static int maildir_safeopen(const char *path, int mode, int perm);
static char *str_pid_t(pid_t t, char *arg);
static char *str_time_t(time_t t, char *arg);
static int maildir_parsequota(const char *n, unsigned long *s);


#define  NUMBUFSIZE      60
#define	MDQUOTA_SIZE	'S'	/* Total size of all messages in maildir */
#define	MDQUOTA_BLOCKS	'B'	/* Total # of blocks for all messages in
				maildir -- NOT IMPLEMENTED */
#define	MDQUOTA_COUNT	'C'	/* Total number of messages in maildir */


/* bk: add domain limits functionality */
int domain_over_maildirquota(const char *userdir)
{
struct  stat    stat_buf;
char	domdir[MAX_PW_DIR];
char	*p;
char	domain[256];
unsigned long size = 0;
unsigned long maxsize = 0;
int	cnt = 0;
int	maxcnt = 0;
struct vlimits limits;

        if (fstat(0, &stat_buf) == 0 && S_ISREG(stat_buf.st_mode) &&
                stat_buf.st_size > 0)
        {

		/* locate the domain directory */
		p = maildir_to_email(userdir);
		if (p == NULL) return -1;

		p = strchr (p, '@');
		if (p == NULL) return -1;

		strcpy(domain, p + 1);

		/* get the domain quota */
		if (vget_limits(domain, &limits)) return 0;
		/* convert from MB to bytes */
		maxsize = limits.diskquota * 1024 * 1024;
		maxcnt = limits.maxmsgcount;

		if (vget_assign (domain, domdir, sizeof(domdir), NULL, NULL) == NULL)
			return -1;

		/* get the domain usage */
		if (readdomainquota(domdir, &size, &cnt)) return -1;

		/* check if either quota (size/count) would be exceeded */
		if (maxsize > 0 && (size + stat_buf.st_size) > maxsize) return 1;
		else if (maxcnt > 0 && cnt >= maxcnt) return 1;
        }

        return 0;
}

int readdomainquota(const char *dir, long *sizep, int *cntp)
{
int tries;
char	checkdir[256];
DIR	*dirp;
struct dirent *de;


	if (dir == NULL || sizep == NULL || cntp == NULL)
		return -1;

	*sizep = 0;
	*cntp = 0;

	dirp=opendir(dir);
	while (dirp && (de=readdir(dirp)) != 0)
	{
		if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
			continue;

#ifdef USERS_BIG_DIR
		if (strlen(de->d_name) == 1) {
			/* recursive call for hashed directory */
			snprintf (checkdir, sizeof(checkdir), "%s/%s", dir, de->d_name);
			if (readdomainquota (checkdir, sizep, cntp) == -1) {
				return -1;
			}
		} else
#endif
		{
			snprintf(checkdir, sizeof(checkdir), "%s/%s/Maildir/", dir, de->d_name);
			tries = 5;
			while (tries-- && readuserquota(checkdir, sizep, cntp))
			{
				if (errno != EAGAIN) return -1;
				sleep(1);
			}
			if (tries <= 0)
				return -1;
		}
	}
	if (dirp)
	{
#if	CLOSEDIR_VOID
		closedir(dirp);
#else
		if (closedir(dirp))
		{
			return (-1);
		}
#endif
	}

	return 0;
}

int wrapreaduserquota(const char* dir, off_t *sizep, int *cntp)
{
time_t	tm;
time_t	maxtime;
DIR	*dirp;
struct dirent *de;

	maxtime=0;

	if (countcurnew(dir, &maxtime, sizep, cntp))
	{
		return (-1);
	}

	dirp=opendir(dir);
	while (dirp && (de=readdir(dirp)) != 0)
	{
		if (countsubdir(dir, de->d_name, &maxtime, sizep, cntp))
		{
			closedir(dirp);
			return (-1);
		}
	}
	if (dirp)
	{
#if	CLOSEDIR_VOID
		closedir(dirp);
#else
		if (closedir(dirp))
		{
			return (-1);
		}
#endif
	}

	/* make sure nothing changed while calculating this... */
	tm=0;

	if (statcurnew(dir, &tm))
	{
		return (-1);
	}

	dirp=opendir(dir);
	while (dirp && (de=readdir(dirp)) != 0)
	{
		if (statsubdir(dir, de->d_name, &tm))
		{
			closedir(dirp);
			return (-1);
		}
	}
	if (dirp)
	{
#if	CLOSEDIR_VOID
		closedir(dirp);
#else
		if (closedir(dirp))
		{
			return (-1);
		}
#endif
	}

	if (tm != maxtime)	/* Race condition, someone changed something */
	{
		errno=EAGAIN;
		return (-1);
	}
	errno=0;

	return 0;
}
int readuserquota(const char* dir, long *sizep, int *cntp)
{
	int retval;
	off_t s;
	
	s = (off_t) *sizep;
	retval = wrapreaduserquota(dir, &s, cntp);
	*sizep = (long) s;
	return retval;
}

int user_over_maildirquota( const char *dir, const char *q)
{
struct  stat    stat_buf;
int     quotafd;
int     ret_value;

        if (fstat(0, &stat_buf) == 0 && S_ISREG(stat_buf.st_mode) &&
                stat_buf.st_size > 0 && *q)
        {
                if (maildir_checkquota(dir, &quotafd, q, stat_buf.st_size, 1)
                        && errno != EAGAIN)
                {
                        if (quotafd >= 0)       close(quotafd);
                        ret_value = 1;
                } else {
                        maildir_addquota(dir, quotafd, q, stat_buf.st_size, 1);
                        if (quotafd >= 0)       close(quotafd);
                        ret_value = 0;
                }
        } else {
                ret_value = 0;
        }

        return(ret_value);
}

void add_warningsize_to_quota( const char *dir, const char *q)
{
struct  stat    stat_buf;
int     quotafd;
char    quotawarnmsg[500];

        snprintf(quotawarnmsg, sizeof(quotawarnmsg), "%s/%s/.quotawarn.msg", VPOPMAILDIR, DOMAINS_DIR);

        if (stat(quotawarnmsg, &stat_buf) == 0 && S_ISREG(stat_buf.st_mode) &&
                stat_buf.st_size > 0 && *q)
        {
                maildir_checkquota(dir, &quotafd, q, stat_buf.st_size, 1);
                if (quotafd >= 0)       close(quotafd);
                maildir_addquota(dir, quotafd, q, 
                    stat_buf.st_size, 1);
                if (quotafd >= 0)       close(quotafd);
        }
}

/* Read the maildirsize file */

static int maildirsize_read(const char *filename,	/* The filename */
	int *fdptr,	/* Keep the file descriptor open */
	off_t *sizeptr,	/* Grand total of maildir size */
	unsigned *cntptr, /* Grand total of message count */
	unsigned *nlines, /* # of lines in maildirsize */
	struct stat *statptr)	/* The stats on maildirsize */
{
 char buf[5120];
 int f;
 char *p;
 unsigned l;
 int n;
 int first;

	if ((f=maildir_safeopen(filename, O_RDWR|O_APPEND, 0)) < 0)
		return (-1);
	p=buf;
	l=sizeof(buf);

	while (l)
	{
		n=read(f, p, l);
		if (n < 0)
		{
			close(f);
			return (-1);
		}
		if (n == 0)	break;
		p += n;
		l -= n;
	}
	if (l == 0 || fstat(f, statptr))	/* maildir too big */
	{
		close(f);
		return (-1);
	}

	*sizeptr=0;
	*cntptr=0;
	*nlines=0;
	*p=0;
	p=buf;
	first=1;
	while (*p)
	{
	long n=0;
	int c=0;
	char	*q=p;

		while (*p)
			if (*p++ == '\n')
			{
				p[-1]=0;
				break;
			}

		if (first)
		{
			first=0;
			continue;
		}
		sscanf(q, "%ld %d", &n, &c);
		*sizeptr += n;
		*cntptr += c;
		++ *nlines;
	}
	*fdptr=f;
	return (0);
}

static int qcalc(off_t s, unsigned n, const char *quota, int *percentage)
{
off_t i;
int	spercentage=0;
int	npercentage=0;

	errno=ENOSPC;
	while (quota && *quota)
	{
		int x=1;

		if (*quota < '0' || *quota > '9')
		{
			++quota;
			continue;
		}
		i=0;
		while (*quota >= '0' && *quota <= '9')
			i=i*10 + (*quota++ - '0');
		switch (*quota)	{
		default:
			if (i < s)
			{
				*percentage=100;
				return (-1);
			}

			/*
			** For huge quotas, over 20mb,
			** divide numerator & denominator by 1024 to prevent
			** an overflow when multiplying by 100
			*/

			x=1;
			if (i > 20000000) x=1024;

			spercentage = i ? (s/x) * 100 / (i/x):100;
			break;
		case 'C':

			if (i < n)
			{
				*percentage=100;
				return (-1);
			}

			/* Ditto */

			x=1;
			if (i > 20000000) x=1024;

			npercentage = i ? ((off_t)n/x) * 100 / (i/x):100;
			break;
		}
	}
	*percentage = spercentage > npercentage ? spercentage:npercentage;
	return (0);
}


static int maildir_checkquota(const char *dir,
	int *maildirsize_fdptr,
	const char *quota_type,
	long xtra_size,
	int xtra_cnt)
{
int	dummy;

	return (docheckquota(dir, maildirsize_fdptr, quota_type,
		xtra_size, xtra_cnt, &dummy));
}

int vmaildir_readquota(const char *dir, const char *quota_type)
{
int	percentage=0;
int	fd=-1;

	(void)docheckquota(dir, &fd, quota_type, 0, 0, &percentage);
	if (fd >= 0)
		close(fd);
	return (percentage);
}

static int docheckquota(const char *dir,
	int *maildirsize_fdptr,
	const char *quota_type,
	long xtra_size,
	int xtra_cnt,
	int *percentage)
{
char	*checkfolder=(char *)malloc(strlen(dir)+sizeof("/maildirfolder"));
char	*newmaildirsizename;
struct stat stat_buf;
int	maildirsize_fd;
off_t	maildirsize_size;
unsigned maildirsize_cnt;
unsigned maildirsize_nlines;
int	n;
time_t	tm;
time_t	maxtime;
DIR	*dirp;
struct dirent *de;

	if (checkfolder == 0)	return (-1);
	*maildirsize_fdptr= -1;
	strcat(strcpy(checkfolder, dir), "/maildirfolder");
	if (stat(checkfolder, &stat_buf) == 0)	/* Go to parent */
	{
		strcat(strcpy(checkfolder, dir), "/..");
		n=docheckquota(checkfolder, maildirsize_fdptr,
			quota_type, xtra_size, xtra_cnt, percentage);
		free(checkfolder);
		return (n);
	}
	if (!quota_type || !*quota_type)	return (0);

	strcat(strcpy(checkfolder, dir), "/maildirsize");
	time(&tm);
	if (maildirsize_read(checkfolder, &maildirsize_fd,
		&maildirsize_size, &maildirsize_cnt,
		&maildirsize_nlines, &stat_buf) == 0)
	{
		n=qcalc(maildirsize_size+xtra_size, maildirsize_cnt+xtra_cnt,
			quota_type, percentage);

		if (n == 0)
		{
			free(checkfolder);
			*maildirsize_fdptr=maildirsize_fd;
			return (0);
		}
		close(maildirsize_fd);