path: root/e-util/e-mktemp.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@ximian.com>
 *
 *  Copyright 2001 Ximian, Inc. (www.ximian.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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.
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <glib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <time.h>

#include <e-util/e-util.h>

#include "e-mktemp.h"

#define d(x)

/* define to put temporary files in ~/evolution/cache/tmp */
#define TEMP_HOME (1)

/* how old things need to be to expire */
#define TEMP_EXPIRE (60*60*2)
/* dont scan more often than this */
#define TEMP_SCAN (60)

static int
expire_dir_rec(const char *base, time_t now)
{
    DIR *dir;
    struct dirent *d;
    GString *path;
    size_t len;
    struct stat st;
    int count = 0;

    d(printf("expire dir '%s'\n", base));

    dir = opendir(base);
    if (dir == NULL)
        return 0;

    path = g_string_new(base);
    len = path->len;

    while ( (d = readdir(dir)) ) {
        if (strcmp(d->d_name, ".") == 0
            || strcmp(d->d_name, "..") == 0)
            continue;

        g_string_truncate(path, len);
        g_string_append_printf(path, "/%s", d->d_name);
        d(printf("Checking '%s' for expiry\n", path->str));

        if (stat(path->str, &st) == 0
            && st.st_atime + TEMP_EXPIRE < now) {
            if (S_ISDIR(st.st_mode)) {
                if (expire_dir_rec(path->str, now) == 0) {
                    d(printf("Removing dir '%s'\n", path->str));
                    rmdir(path->str);
                } else {
                    count++;
                }
            } else if (unlink(path->str) == -1) {
                d(printf("expiry failed: %s\n", strerror(errno)));
                count++;
            } else {
                d(printf("expired %s\n", path->str));
            }
        } else {
            count++;
        }
    }
    g_string_free(path, TRUE);
    closedir(dir);

    d(printf("expire dir '%s' %d remaining files\n", base, count));

    return count;
}

static GString *
get_dir (gboolean make)
{
    GString *path;
    time_t now = time(0);
    static time_t last = 0;
    
#ifdef TEMP_HOME
    path = g_string_new (g_get_home_dir());
    g_string_append_printf(path, "/.evolution/cache/tmp");
    if (make && e_mkdir_hier(path->str, 0777) == -1) {
        g_string_free(path, TRUE);
        path = NULL;
    }
#else
    path = g_string_new("/tmp/evolution-");
    g_string_append_printf (path, "%d", (int) getuid ());
    if (make) {
        int ret;
        
        /* shoot now, ask questions later */
        ret = mkdir (path->str, S_IRWXU);
        if (ret == -1) {
            if (errno == EEXIST) {
                struct stat st;
                
                if (stat (path->str, &st) == -1) {
                    /* reset errno */
                    errno = EEXIST;
                    g_string_free (path, TRUE);
                    return NULL;
                }
                
                /* make sure this is a directory and belongs to us... */
                if (!S_ISDIR (st.st_mode) || st.st_uid != getuid ()) {
                    /* eek! this is bad... */
                    g_string_free (path, TRUE);
                    return NULL;
                }
            } else {
                /* some other error...do not pass go, do not collect $200 */
                g_string_free (path, TRUE);
                return NULL;
            }
        }
    }
#endif  

    d(printf("temp dir '%s'\n", path ? path->str : "(null)"));

    /* fire off an expirey attempt no more often than TEMP_SCAN seconds */
    if (path && (last+TEMP_SCAN) < now) {
        last = now;
        expire_dir_rec(path->str, now);
    }

    return path;
}

char *
e_mktemp (const char *template)
{
    GString *path;
    char *ret;
    
    path = get_dir (TRUE);
    if (!path)
        return NULL;
    
    g_string_append_c (path, '/');
    if (template)
        g_string_append (path, template);
    else
        g_string_append (path, "unknown-XXXXXX");
    
    ret = mktemp (path->str);
    g_string_free(path, ret == NULL);
    
    return ret;
}


int
e_mkstemp (const char *template)
{
    GString *path;
    int fd;
    
    path = get_dir (TRUE);
    if (!path)
        return -1;
    
    g_string_append_c (path, '/');
    if (template)
        g_string_append (path, template);
    else
        g_string_append (path, "unknown-XXXXXX");
    
    fd = mkstemp (path->str);
    g_string_free(path, TRUE);
    
    return fd;
}


char *
e_mkdtemp (const char *template)
{
    GString *path;
    char *tmpdir;
    
    path = get_dir (TRUE);
    if (!path)
        return NULL;
    
    g_string_append_c (path, '/');
    if (template)
        g_string_append (path, template);
    else
        g_string_append (path, "unknown-XXXXXX");
    
#ifdef HAVE_MKDTEMP
    tmpdir = mkdtemp (path->str);
#else
    tmpdir = mktemp (path->str);
    if (tmpdir) {
        if (mkdir (tmpdir, S_IRWXU) == -1)
            tmpdir = NULL;
    }
#endif
    g_string_free(path, tmpdir == NULL);
    
    return tmpdir;
}