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deb-mbse/lib/dbfdb.c

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2004-05-03 12:35:58 +00:00
/*****************************************************************************
*
* $Id$
* Purpose ...............: Files database functions
*
*****************************************************************************
* Copyright (C) 1997-2004
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS 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, or (at your option) any
* later version.
*
* MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include "mbselib.h"
#include "users.h"
#include "mbsedb.h"
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/*
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* Open files database Area number. Do some checks and abort
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* if they fail.
*/
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struct _fdbarea *mbsedb_OpenFDB(long Area, int Timeout)
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{
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char *temp;
struct _fdbarea *fdb_area = NULL;
int Tries = 0;
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FILE *fp;
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temp = calloc(PATH_MAX, sizeof(char));
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fdb_area = malloc(sizeof(struct _fdbarea)); /* Will be freed by CloseFDB */
sprintf(temp, "%s/var/fdb/file%ld.data", getenv("MBSE_ROOT"), Area);
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/*
* Open the file database, if it's locked, just wait.
*/
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while (((fp = fopen(temp, "r+")) == NULL) && ((errno == EACCES) || (errno == EAGAIN))) {
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if (++Tries >= (Timeout * 4)) {
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WriteError("Can't open file area %ld, timeout", Area);
free(temp);
return NULL;
}
msleep(250);
Syslog('f', "Open file area %ld, try %d", Area, Tries);
}
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if (fp == NULL) {
if (errno == ENOENT) {
Syslog('+', "Create empty FDB for area %ld", Area);
fdbhdr.hdrsize = sizeof(fdbhdr);
fdbhdr.recsize = sizeof(fdb);
if ((fp = fopen(temp, "w+"))) {
fwrite(&fdbhdr, sizeof(fdbhdr), 1, fp);
}
}
} else {
fread(&fdbhdr, sizeof(fdbhdr), 1, fp);
}
/*
* If still not open, it's fatal.
*/
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if (fp == NULL) {
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WriteError("$Can't open %s", temp);
free(temp);
return NULL;
}
/*
* Fix attributes if needed
*/
chmod(temp, 0660);
free(temp);
if ((fdbhdr.hdrsize != sizeof(fdbhdr)) || (fdbhdr.recsize != sizeof(fdb))) {
WriteError("Files database header in area %d is corrupt (%d:%d)", Area, fdbhdr.hdrsize, fdbhdr.recsize);
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fclose(fdb_area->fp);
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return NULL;
}
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fseek(fp, 0, SEEK_END);
if ((ftell(fp) - fdbhdr.hdrsize) % fdbhdr.recsize) {
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WriteError("Files database area %ld is corrupt, unalligned records", Area);
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fclose(fp);
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return NULL;
}
/*
* Point to the first record
*/
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fseek(fp, fdbhdr.hdrsize, SEEK_SET);
fdb_area->fp = fp;
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fdb_area->locked = 0;
fdb_area->area = Area;
return fdb_area;
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}
/*
* Close current open file area
*/
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int mbsedb_CloseFDB(struct _fdbarea *fdb_area)
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{
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fclose(fdb_area->fp);
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free(fdb_area);
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return TRUE;
}
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/*
* Lock Files DataBase
*/
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int mbsedb_LockFDB(struct _fdbarea *fdb_area, int Timeout)
{
int rc, Tries = 0;
struct flock fl;
fl.l_type = F_WRLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0L;
fl.l_len = 1L;
fl.l_pid = getpid();
while ((rc = fcntl(fileno(fdb_area->fp), F_SETLK, &fl)) && ((errno == EACCES) || (errno == EAGAIN))) {
if (++Tries >= (Timeout * 4)) {
fcntl(fileno(fdb_area->fp), F_GETLK, &fl);
WriteError("FDB %ld is locked by pid %d", fdb_area->area, fl.l_pid);
return FALSE;
}
msleep(250);
Syslog('f', "FDB lock attempt %d", Tries);
}
if (rc) {
WriteError("$FDB %ld lock error", fdb_area->area);
return FALSE;
}
fdb_area->locked = 1;
return TRUE;
}
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/*
* Unlock Files DataBase
*/
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int mbsedb_UnlockFDB(struct _fdbarea *fdb_area)
{
struct flock fl;
fl.l_type = F_UNLCK;
fl.l_whence = SEEK_SET;
fl.l_start = 0L;
fl.l_len = 1L;
fl.l_pid = getpid();
if (fcntl(fileno(fdb_area->fp), F_SETLK, &fl)) {
WriteError("$Can't unlock FDB area %ld", fdb_area->area);
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}
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fdb_area->locked = 0;
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return TRUE;
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}
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int mbsedb_InsertFDB(struct _fdbarea *fdb_area, struct FILE_record frec, int AddAlpha)
{
char *temp, *temp2;
int i, Insert, Done = FALSE, Found = FALSE, rc;
FILE *fp;
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Syslog('f', "mbsedb_InsertFDB: \"%s\", magic \"%s\"", frec.LName, frec.Magic);
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if (mbsedb_LockFDB(fdb_area, 30) == FALSE)
return FALSE;
fseek(fdb_area->fp, 0, SEEK_END);
if (ftell(fdb_area->fp) == fdbhdr.hdrsize) {
/*
* No records yet, simply append this first record.
*/
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fwrite(&frec, fdbhdr.recsize, 1, fdb_area->fp);
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mbsedb_UnlockFDB(fdb_area);
return TRUE;
}
/*
* There are files, search the insert point.
*/
temp = calloc(PATH_MAX, sizeof(char));
temp2 = calloc(PATH_MAX, sizeof(char));
sprintf(temp, "%s/var/fdb/file%ld.temp", getenv("MBSE_ROOT"), fdb_area->area);
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fseek(fdb_area->fp, fdbhdr.hdrsize, SEEK_SET);
Insert = 0;
do {
if (fread(&fdb, fdbhdr.recsize, 1, fdb_area->fp) != 1)
Done = TRUE;
if (!Done) {
if (strcmp(frec.LName, fdb.LName) == 0) {
Found = TRUE;
Insert++;
} else if (strcmp(frec.LName, fdb.LName) < 0)
Found = TRUE;
else
Insert++;
}
} while ((!Found) && (!Done));
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Syslog('f', "mbsedb_InsertFDB: insertpoint=%d, found=%s, done=%s", Insert, Found?"true":"false", Done?"true":"false");
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if (Found) {
if ((fp = fopen(temp, "a+")) == NULL) {
WriteError("$Can't create %s", temp);
mbsedb_UnlockFDB(fdb_area);
free(temp);
return FALSE;
}
fwrite(&fdbhdr, sizeof(fdbhdr), 1, fp);
fseek(fdb_area->fp, fdbhdr.hdrsize, SEEK_SET);
/*
* Copy entries untill the insert point.
*/
for (i = 0; i < Insert; i++) {
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fread(&fdb, fdbhdr.recsize, 1, fdb_area->fp);
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/*
* If we see a magic that is the new magic, remove
* the old one.
*/
if (strlen(frec.Magic) && (strcmp(fdb.Magic, frec.Magic) == 0)) {
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Syslog('f', "Clear magic %s file %s", fdb.Magic, fdb.LName);
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memset(&fdb.Magic, 0, sizeof(fdb.Magic));
}
/*
* Check if we are importing a file with the same
* name, if so, don't copy the original database
* record. The file is also overwritten.
*/
if (strcmp(fdb.LName, frec.LName) != 0)
fwrite(&fdb, fdbhdr.recsize, 1, fp);
}
if (AddAlpha) {
/*
* Insert new entry
*/
fwrite(&frec, fdbhdr.recsize, 1, fp);
}
/*
* Append the rest of the entries
*/
while (fread(&fdb, fdbhdr.recsize, 1, fdb_area->fp) == 1) {
/*
* If we see a magic that is the new magic, remove
* the old one.
*/
if (strlen(frec.Magic) && (strcmp(fdb.Magic, frec.Magic) == 0)) {
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Syslog('f', "Clear magic %s file %s", fdb.Magic, fdb.LName);
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memset(&fdb.Magic, 0, sizeof(fdb.Magic));
}
/*
* Check if we are importing a file with the same
* name, if so, don't copy the original database
* record. The file is also overwritten.
*/
if (strcmp(fdb.LName, frec.LName) != 0)
fwrite(&fdb, fdbhdr.recsize, 1, fp);
}
if (! AddAlpha) {
/*
* Append
*/
fwrite(&frec, fdbhdr.recsize, 1, fp);
}
/*
* Now the trick, some might be waiting for a lock on the original file,
* we will give that a new name on disk. Then we move the temp in place.
* Finaly remove the old (still locked) original file.
*/
sprintf(temp2, "%s/var/fdb/file%ld.data", getenv("MBSE_ROOT"), fdb_area->area);
sprintf(temp, "%s/var/fdb/file%ld.xxxx", getenv("MBSE_ROOT"), fdb_area->area);
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rc = rename(temp2, temp);
sprintf(temp, "%s/var/fdb/file%ld.temp", getenv("MBSE_ROOT"), fdb_area->area);
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rc = rename(temp, temp2);
sprintf(temp, "%s/var/fdb/file%ld.xxxx", getenv("MBSE_ROOT"), fdb_area->area);
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rc = unlink(temp);
fdb_area->fp = fp;
fdb_area->locked = 0;
} else {
/*
* Append new entry
*/
fseek(fdb_area->fp, 0, SEEK_END);
fwrite(&frec, fdbhdr.recsize, 1, fdb_area->fp);
}
free(temp);
free(temp2);
return TRUE;
}
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/*
* Return -1 if error, else number of purged records
*/
int mbsedb_PackFDB(struct _fdbarea *fdb_area)
{
char *temp, *temp2;
FILE *fp;
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int count = 0;
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fseek(fdb_area->fp, 0, SEEK_END);
if (ftell(fdb_area->fp) == fdbhdr.hdrsize) {
return 0;
}
if (mbsedb_LockFDB(fdb_area, 30) == FALSE)
return -1;
/*
* There are files, copy the remaining entries
*/
temp = calloc(PATH_MAX, sizeof(char));
temp2 = calloc(PATH_MAX, sizeof(char));
sprintf(temp, "%s/var/fdb/file%ld.temp", getenv("MBSE_ROOT"), fdb_area->area);
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if ((fp = fopen(temp, "a+")) == NULL) {
WriteError("$Can't create %s", temp);
mbsedb_UnlockFDB(fdb_area);
return -1;
}
fwrite(&fdbhdr, fdbhdr.hdrsize, 1, fp);
fseek(fdb_area->fp, fdbhdr.hdrsize, SEEK_SET);
while (fread(&fdb, fdbhdr.recsize, 1, fdb_area->fp) == 1) {
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if ((!fdb.Deleted) && (!fdb.Double) && (strcmp(fdb.Name, "") != 0))
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fwrite(&fdb, fdbhdr.recsize, 1, fp);
else
count++;
}
/*
* Now the trick, some might be waiting for a lock on the original file,
* we will give that a new name on disk. Then we move the temp in place.
* Finaly remove the old (still locked) original file.
*/
sprintf(temp2, "%s/var/fdb/file%ld.data", getenv("MBSE_ROOT"), fdb_area->area);
sprintf(temp, "%s/var/fdb/file%ld.xxxx", getenv("MBSE_ROOT"), fdb_area->area);
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rename(temp2, temp);
sprintf(temp, "%s/var/fdb/file%ld.temp", getenv("MBSE_ROOT"), fdb_area->area);
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rename(temp, temp2);
sprintf(temp, "%s/var/fdb/file%ld.xxxx", getenv("MBSE_ROOT"), fdb_area->area);
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unlink(temp);
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fdb_area->fp = fp;
fdb_area->locked = 0;
free(temp);
free(temp2);
return count;
}
typedef struct _fdbs {
struct _fdbs *next;
struct FILE_record filrec;
} fdbs;
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void fill_fdbs(struct FILE_record, fdbs **);
void fill_fdbs(struct FILE_record filrec, fdbs **fap)
{
fdbs *tmp;
tmp = (fdbs *)malloc(sizeof(fdbs));
tmp->next = *fap;
tmp->filrec = filrec;
*fap = tmp;
}
void tidy_fdbs(fdbs **);
void tidy_fdbs(fdbs **fap)
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{
fdbs *tmp, *old;
for (tmp = *fap; tmp; tmp = old) {
old = tmp->next;
free(tmp);
}
*fap = NULL;
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}
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int comp_fdbs(fdbs **, fdbs **);
void sort_fdbs(fdbs **);
void sort_fdbs(fdbs **fap)
{
fdbs *ta, **vector;
size_t n = 0, i;
if (*fap == NULL)
return;
for (ta = *fap; ta; ta = ta->next)
n++;
vector = (fdbs **)malloc(n * sizeof(fdbs *));
i = 0;
for (ta = *fap; ta; ta = ta->next)
vector[i++] = ta;
qsort(vector, n, sizeof(fdbs *), (int(*)(const void*, const void *))comp_fdbs);
(*fap) = vector[0];
i = 1;
for (ta = *fap; ta; ta = ta->next) {
if (i < n)
ta->next = vector[i++];
else
ta->next = NULL;
}
free(vector);
return;
}
int comp_fdbs(fdbs **fap1, fdbs **fap2)
{
return strcasecmp((*fap1)->filrec.LName, (*fap2)->filrec.LName);
}
/*
* Sort a files database using the long filenames.
*/
int mbsedb_SortFDB(struct _fdbarea *fdb_area)
{
fdbs *fdx = NULL, *tmp;
char *temp, *temp2;
FILE *fp;
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int count = 0;
fseek(fdb_area->fp, 0, SEEK_END);
if (ftell(fdb_area->fp) <= (fdbhdr.hdrsize + fdbhdr.recsize)) {
return 0;
}
fseek(fdb_area->fp, fdbhdr.hdrsize, SEEK_SET);
while (fread(&fdb, fdbhdr.recsize, 1, fdb_area->fp) == 1) {
fill_fdbs(fdb, &fdx);
}
sort_fdbs(&fdx);
/*
* Now the most timeconsuming part is done, lock the database and
* write the new sorted version.
*/
if (mbsedb_LockFDB(fdb_area, 30) == FALSE) {
tidy_fdbs(&fdx);
return -1;
}
temp = calloc(PATH_MAX, sizeof(char));
sprintf(temp, "%s/var/fdb/file%ld.temp", getenv("MBSE_ROOT"), fdb_area->area);
if ((fp = fopen(temp, "a+")) == NULL) {
WriteError("$Can't create %s", temp);
mbsedb_UnlockFDB(fdb_area);
tidy_fdbs(&fdx);
free(temp);
return -1;
}
fwrite(&fdbhdr, fdbhdr.hdrsize, 1, fp);
/*
* Write sorted files to temp database
*/
for (tmp = fdx; tmp; tmp = tmp->next) {
fwrite(&tmp->filrec, fdbhdr.recsize, 1, fp);
count++;
}
tidy_fdbs(&fdx);
/*
* Now the trick, some might be waiting for a lock on the original file,
* we will give that a new name on disk. Then we move the temp in place.
* Finaly remove the old (still locked) original file.
*/
temp2 = calloc(PATH_MAX, sizeof(char));
sprintf(temp2, "%s/var/fdb/file%ld.data", getenv("MBSE_ROOT"), fdb_area->area);
sprintf(temp, "%s/var/fdb/file%ld.xxxx", getenv("MBSE_ROOT"), fdb_area->area);
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rename(temp2, temp);
sprintf(temp, "%s/var/fdb/file%ld.temp", getenv("MBSE_ROOT"), fdb_area->area);
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rename(temp, temp2);
sprintf(temp, "%s/var/fdb/file%ld.xxxx", getenv("MBSE_ROOT"), fdb_area->area);
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unlink(temp);
fdb_area->fp = fp;
fdb_area->locked = 0;
free(temp);
free(temp2);
return count;
}
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