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maildirquota.c
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/*
* Copyright (C) 1999-2009 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"
#include "conf.h"
#include "storage.h"
#include "client.h"
/* private functions - no name clashes with courier */
static char *makenewmaildirsizename(const char *, int *);
static int countcurnew(const char *dir, time_t *maxtime, storage_t *sizep, storage_t *cntp);
static int countsubdir(const char *dir, const char *subdir, time_t *maxtime, storage_t *sizep, storage_t *cntp);
static int statcurnew(const char *dir, time_t *maxtimestamp);
static int statsubdir(const char *dir, const char *subdir, time_t *maxtime);
static int doaddquota(const char *dir, int maildirsize_fd, const char *quota_type,
storage_t maildirsize_size, storage_t maildirsize_cnt, int isnew);
static int docheckquota(const char *dir, int *maildirsize_fdptr, const char *quota_type,
storage_t xtra_size, storage_t xtra_cnt, int *percentage);
static int docount(const char *dir, time_t *dirstamp, storage_t *sizep, storage_t *cntp);
static int maildir_checkquota(const char *dir, int *maildirsize_fdptr, const char *quota_type, storage_t xtra_size, storage_t xtra_cnt);
/* moved into maildirquota.h as non-static
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, storage_t *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 */
int quota_mtos(const char *, storage_t *, storage_t *);
int quota_user_usage(const char *, storage_t *, storage_t *);
/* 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], qb[256] = { 0 };
storage_t size = 0;
storage_t maxsize = 0;
storage_t cnt = 0;
int ret = 0;
storage_t maxcnt = 0;
struct vlimits limits;
storage_t susage = 0, cusage = 0;
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;
/* only check the quota if one is set */
if(( maxsize==0 ) && (maxcnt==0)) return 0;
if (vget_assign (domain, domdir, sizeof(domdir), NULL, NULL) == NULL)
return -1;
/* get the domain usage */
ret = strlen(domain);
if ((ret + 2) < sizeof(qb)) {
*qb = '@';
memcpy((qb + 1), domain, ret);
*(qb + ret + 1) = '\0';
ret = client_query_quick(qb, &susage, &cusage);
if (ret) {
if ((susage + stat_buf.st_size) > maxsize)
return 1;
if ((maxcnt) && (cusage >= maxcnt))
return 1;
return 0;
}
}
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, storage_t *sizep, storage_t *cntp)
{
int tries;
char checkdir[256];
DIR *dirp;
struct dirent *de;
int r;
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 */
r = snprintf (checkdir, sizeof(checkdir), "%s/%s", dir, de->d_name);
if (r == -1) {
return -1;
}
if (readdomainquota (checkdir, sizep, cntp) == -1) {
return -1;
}
} else
#endif
{
r = snprintf(checkdir, sizeof(checkdir), "%s/%s/Maildir/", dir, de->d_name);
if (r == -1) {
return -1;
}
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, storage_t *sizep, storage_t *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, storage_t *sizep, storage_t *cntp)
{
int retval;
storage_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 = -1;
int ret_value = 0;
// stat file is regular file size > 0 what is q?
if (fstat(0, &stat_buf) == 0 && S_ISREG(stat_buf.st_mode) && stat_buf.st_size > 0 && *q)
{ // check the quota, and not again error
if (maildir_checkquota(dir, "afd, 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, "afd, 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 */
storage_t *sizeptr, /* Grand total of maildir size */
storage_t *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;
storage_t n;
int first;
int ret = 0;
if ((f=maildir_safeopen(filename, O_RDWR|O_APPEND, 0)) < 0)
return (-1);
p=buf;
l=sizeof(buf);
/*
Maildir++ specification says to rebuild the maildirsize file if the
file is 5120 or more bytes, or is more than 15 minutes old
*/
ret = fstat(f, statptr);
if ((ret != -1) && ((statptr->st_size >= 5120) || (time(NULL) > statptr->st_mtime + (15*60)))) {
unlink(filename);
close(f);
return -1;
}
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 || ret) /* maildir too big */
{
close(f);
return (-1);
}
*sizeptr=0;
*cntptr=0;
*nlines=0;
*p=0;
p=buf;
first=1;
while (*p)
{
storage_t n=0;
storage_t c=0;
char *q=p;
while (*p)
if (*p++ == '\n')
{
p[-1]=0;
break;
}
if (first)
{
first=0;
continue;
}
sscanf(q, "%" PRIu64 " %" PRIu64 "", &n, &c);
*sizeptr += n;
*cntptr += c;
++ *nlines;
}
*fdptr=f;
return (0);
}
static int qcalc(storage_t s, storage_t n, const char *quota, int *percentage)
{
storage_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);
}
#if 0
/*
** 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;
#endif
spercentage = i ? (s/x) * 100 / (i/x):100;
break;
case 'C':
if (i < n)
{
*percentage=100;
return (-1);
}
#if 0
/* Ditto */
x=1;
if (i > 20000000) x=1024;
#endif
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,
storage_t xtra_size,
storage_t xtra_cnt)
{
int dummy, ret = 0;
if ((xtra_size == 0) || (xtra_cnt == 0))
return 0;
/*
Ping the daemon
*/
ret = client_query_quick(" ", NULL, NULL);
if (ret) {
ret = vmaildir_readquota(dir, quota_type);
if (ret >= 100)
return -1;
return 0;
}
/*
Fall back
*/
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;
int ret = 0;
char *email = NULL;
storage_t uusage = 0, dusage = 0, usquota = 0, ucquota = 0;
/*
Get user usage
*/
email = maildir_to_email(dir);
ret = client_query_quick(email, &uusage, &dusage);
if (ret) {
if (uusage != -1) {
/*
Convert quota string to integers
*/
quota_mtos(quota_type, &usquota, &ucquota);
/*
Return percentage
*/
fd = (int)((long double)((long double)uusage/(long double)usquota) * (long double)100.0);
if (fd > 100)
fd = 100;
if (fd < 0)
fd = 0;
return fd;
}
return 0;
}
/*
If usage daemon is not running, fall back on old methods
*/
(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,
storage_t xtra_size,
storage_t xtra_cnt,
int *percentage)
{
char *checkfolder=(char *)malloc(strlen(dir)+sizeof("/maildirfolder"));
char *newmaildirsizename;
struct stat stat_buf;
int maildirsize_fd = -1;
storage_t maildirsize_size;
storage_t 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);
if (maildirsize_nlines == 1 && tm < stat_buf.st_mtime + 15*60)
return (n);
}
/* rebuild the maildirsizefile */
maxtime=0;
maildirsize_size=0;
maildirsize_cnt=0;
if (countcurnew(dir, &maxtime, &maildirsize_size, &maildirsize_cnt))
{
free(checkfolder);
return (-1);
}
dirp=opendir(dir);
while (dirp && (de=readdir(dirp)) != 0)
{
if (countsubdir(dir, de->d_name, &maxtime, &maildirsize_size,
&maildirsize_cnt))
{
free(checkfolder);
closedir(dirp);
return (-1);
}
}
if (dirp)
{
#if CLOSEDIR_VOID
closedir(dirp);
#else
if (closedir(dirp))
{
free(checkfolder);
return (-1);
}
#endif
}
newmaildirsizename=makenewmaildirsizename(dir, &maildirsize_fd);
if (!newmaildirsizename)
{
free(checkfolder);
return (-1);
}
chown(newmaildirsizename, VPOPMAILUID, VPOPMAILGID);
*maildirsize_fdptr=maildirsize_fd;
if (doaddquota(dir, maildirsize_fd, quota_type, maildirsize_size,
maildirsize_cnt, 1))
{
close(maildirsize_fd);
unlink(newmaildirsizename);
*maildirsize_fdptr= -1;
free(newmaildirsizename);
free(checkfolder);
return (-1);
}
strcat(strcpy(checkfolder, dir), "/maildirsize");
if (rename(newmaildirsizename, checkfolder))
{
unlink(newmaildirsizename);
close(maildirsize_fd);
*maildirsize_fdptr= -1;
}
free(checkfolder);
free(newmaildirsizename);
tm=0;
if (statcurnew(dir, &tm))
{
close(maildirsize_fd);
*maildirsize_fdptr= -1;
return (-1);
}
dirp=opendir(dir);
while (dirp && (de=readdir(dirp)) != 0)
{
if (statsubdir(dir, de->d_name, &tm))
{
close(maildirsize_fd);
*maildirsize_fdptr= -1;
closedir(dirp);
return (-1);
}
}
if (dirp)
{
#if CLOSEDIR_VOID
closedir(dirp);
#else
if (closedir(dirp))
{
close(maildirsize_fd);
*maildirsize_fdptr= -1;
return (-1);
}
#endif
}
if (tm != maxtime) /* Race condition, someone changed something */
{
errno=EAGAIN;
return (-1);
}
return (qcalc(maildirsize_size+xtra_size, maildirsize_cnt+xtra_cnt,
quota_type, percentage));
}
int maildir_addquota(const char *dir, int maildirsize_fd,
const char *quota_type, storage_t maildirsize_size, storage_t maildirsize_cnt)
{
int ret = 0;
/*
Ping the usage daemon
If it's running, we're done here.
*/
ret = client_query_quick(" ", NULL, NULL);
if (ret)
return 0;
/*
Fall back
*/
if (!quota_type || !*quota_type) return (0);
return (doaddquota(dir, maildirsize_fd, quota_type, maildirsize_size,
maildirsize_cnt, 0));
}
static int doaddquota(const char *dir, int maildirsize_fd,
const char *quota_type, storage_t maildirsize_size, storage_t maildirsize_cnt,
int isnew)
{
union {
char buf[100];
struct stat stat_buf;
} u; /* Scrooge */
char *newname2=0;
char *newmaildirsizename=0;
struct iovec iov[3];
int niov;
struct iovec *p;
int n;
niov=0;
if ( maildirsize_fd < 0)
{
newname2=(char *)malloc(strlen(dir)+sizeof("/maildirfolder"));
if (!newname2) return (-1);
strcat(strcpy(newname2, dir), "/maildirfolder");
if (stat(newname2, &u.stat_buf) == 0)
{
strcat(strcpy(newname2, dir), "/..");
n=doaddquota(newname2, maildirsize_fd, quota_type,
maildirsize_size, maildirsize_cnt,
isnew);
free(newname2);
return (n);
}
strcat(strcpy(newname2, dir), "/maildirsize");
if ((maildirsize_fd=maildir_safeopen(newname2,
O_RDWR|O_APPEND, 0644)) < 0)
{
newmaildirsizename=makenewmaildirsizename(dir, &maildirsize_fd);
if (!newmaildirsizename)
{
free(newname2);
return (-1);
}
maildirsize_fd=maildir_safeopen(newmaildirsizename,
O_CREAT|O_RDWR|O_APPEND, 0644);
if (maildirsize_fd < 0)
{
free(newname2);
return (-1);
}
isnew=1;
}
}
if (isnew)
{
iov[0].iov_base=(void *)quota_type;
iov[0].iov_len=strlen(quota_type);
iov[1].iov_base="\n";
iov[1].iov_len=1;
niov=2;
}
sprintf(u.buf, "%" PRIu64 " %" PRIu64 "\n", maildirsize_size, maildirsize_cnt);
iov[niov].iov_base=u.buf;
iov[niov].iov_len=strlen(u.buf);
p=iov;
++niov;
n=0;
while (niov)
{
if (n)
{
if (n < p->iov_len)
{
p->iov_base=
((char *)p->iov_base + n);
p->iov_len -= n;
}
else
{
n -= p->iov_len;
++p;
--niov;
continue;
}
}
n=writev( maildirsize_fd, p, niov);
if (n <= 0)
{
if (newname2)
{
close(maildirsize_fd);
free(newname2);
}
return (-1);
}
}
if (newname2)
{
close(maildirsize_fd);
if (newmaildirsizename)
{
rename(newmaildirsizename, newname2);
free(newmaildirsizename);
}
free(newname2);
}
return (0);
}
/* New maildirsize is built in the tmp subdirectory */
static char *makenewmaildirsizename(const char *dir, int *fd)
{
char hostname[256];
struct stat stat_buf;
time_t t;
char *p;
int i;
hostname[0]=0;
hostname[sizeof(hostname)-1]=0;
gethostname(hostname, sizeof(hostname)-1);
p=(char *)malloc(strlen(dir)+strlen(hostname)+130);
if (!p) return (0);
/* do not hang forever */
for (i=0;i<3;++i)
{
char tbuf[NUMBUFSIZE];
char pbuf[NUMBUFSIZE];
time(&t);
strcat(strcpy(p, dir), "/tmp/");
sprintf(p+strlen(p), "%s.%s_NeWmAiLdIrSiZe.%s",
str_time_t(t, tbuf),
str_pid_t(getpid(), pbuf), hostname);
if (stat( (const char *)p, &stat_buf) < 0 &&
(*fd=maildir_safeopen(p,
O_CREAT|O_RDWR|O_APPEND, 0644)) >= 0)
break;
usleep(100);
}
return (p);
}
static int statcurnew(const char *dir, time_t *maxtimestamp)
{
char *p=(char *)malloc(strlen(dir)+5);
struct stat stat_buf;
if (!p) return (-1);
strcat(strcpy(p, dir), "/cur");
if ( stat(p, &stat_buf) == 0 && stat_buf.st_mtime > *maxtimestamp)
*maxtimestamp=stat_buf.st_mtime;
strcat(strcpy(p, dir), "/new");
if ( stat(p, &stat_buf) == 0 && stat_buf.st_mtime > *maxtimestamp)
*maxtimestamp=stat_buf.st_mtime;
free(p);
return (0);
}
static int statsubdir(const char *dir, const char *subdir, time_t *maxtime)
{
char *p;
int n;
if ( *subdir != '.' || strcmp(subdir, ".") == 0 ||
strcmp(subdir, "..") == 0 || strcmp(subdir, ".Trash") == 0)
return (0);
p=(char *)malloc(strlen(dir)+strlen(subdir)+2);
if (!p) return (-1);
strcat(strcat(strcpy(p, dir), "/"), subdir);
n=statcurnew(p, maxtime);
free(p);
return (n);
}
static int countcurnew(const char *dir, time_t *maxtime, storage_t *sizep, storage_t *cntp)
{
char *p=(char *)malloc(strlen(dir)+5);
int n;
if (!p) return (-1);
strcat(strcpy(p, dir), "/new");
n=docount(p, maxtime, sizep, cntp);
if (n == 0)
{
strcat(strcpy(p, dir), "/cur");
n=docount(p, maxtime, sizep, cntp);
}
free(p);
return (n);
}
static int countsubdir(const char *dir, const char *subdir, time_t *maxtime, storage_t *sizep, storage_t *cntp)
{
char *p;
int n;
if ( *subdir != '.' || strcmp(subdir, ".") == 0 ||
strcmp(subdir, "..") == 0 || strcmp(subdir, ".Trash") == 0)
return (0);
p=(char *)malloc(strlen(dir)+strlen(subdir)+2);
if (!p) return (2);
strcat(strcat(strcpy(p, dir), "/"), subdir);
n=countcurnew(p, maxtime, sizep, cntp);
free(p);
return (n);
}
static int docount(const char *dir, time_t *dirstamp, storage_t *sizep, storage_t *cntp)
{
struct stat stat_buf;
char *p;
DIR *dirp;
struct dirent *de;
storage_t s;
if (stat(dir, &stat_buf)) return (0); /* Ignore */
if (stat_buf.st_mtime > *dirstamp) *dirstamp=stat_buf.st_mtime;
if ((dirp=opendir(dir)) == 0) return (0);
while ((de=readdir(dirp)) != 0)
{
const char *n=de->d_name;
if (*n == '.') continue;
/* PATCH - do not count msgs marked as deleted */
for ( ; *n; n++)
{
if (n[0] != ':' || n[1] != '2' ||
n[2] != ',') continue;
n += 3;
while (*n >= 'A' && *n <= 'Z')
{
if (*n == 'T') break;
++n;
}
break;
}