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/*
* squid_session: Squid external acl helper for tracking sessions
*
* Copyright (C) 2006 Henrik Nordstrom <henrik@henriknordstrom.net>
*
* 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, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#if defined(HAVE_DB_185_H)
#include <db_185.h>
#elif defined(HAVE_DB_H)
#include <db.h>
#else
#include <db_185.h>
#endif
static int session_ttl = 3600;
char *db_path = NULL;
const char *program_name;
DB *db = NULL;
static void init_db(void)
{
db = dbopen(db_path, O_CREAT | O_RDWR, 0666, DB_BTREE, NULL);
if (!db) {
fprintf(stderr, "%s: Failed to open session db '%s'\n", program_name, db_path);
exit(1);
}
}
static void shutdown_db(void)
{
db->close(db);
}
int session_is_active = 0;
static int session_active(const char *details)
{
DBT key, data;
key.data = (void *)details;
key.size = strlen(details);
if (db->get(db, &key, &data, 0) == 0) {
time_t timestamp;
if (data.size != sizeof(timestamp)) {
fprintf(stderr, "%s: CORRUPTED DATABASE (%s)\n", program_name, details);
db->del(db, &key, 0);
return 0;
}
memcpy(×tamp, data.data, sizeof(timestamp));
if (timestamp + session_ttl >= time(NULL))
return 1;
}
return 0;
}
static void session_login(const char *details)
{
DBT key, data;
time_t now = time(NULL);
key.data = (void *)details;
key.size = strlen(details);
data.data = &now;
data.size = sizeof(now);
db->put(db, &key, &data, 0);
}
static void session_logout(const char *details)
{
DBT key;
key.data = (void *)details;
key.size = strlen(details);
db->del(db, &key, 0);
}
static void usage(void)
{
fprintf(stderr, "Usage: %s [-t session_timeout] [-b dbpath] [-a]\n", program_name);
fprintf(stderr, " -t sessiontimeout Idle timeout after which sessions will be forgotten\n");
fprintf(stderr, " -b dbpath Path where persistent session database will be kept\n");
fprintf(stderr, " -a Active mode requiring LOGIN argument to start a session\n");
}
int main(int argc, char **argv)
{
char request[256];
int opt;
int default_action = 1;
program_name = argv[0];
while ((opt = getopt(argc, argv, "t:b:a?")) != -1) {
switch(opt) {
case 't':
session_ttl = strtol(optarg, NULL, 0);
break;
case 'b':
db_path = optarg;
break;
case 'a':
default_action = 0;
break;
case '?':
usage();
exit(0);
break;
}
}
setbuf(stdout, NULL);
init_db();
while (fgets(request, sizeof(request), stdin)) {
const char *index, *detail;
char *lastdetail;
int action = 0;
index = strtok(request, " \n");
detail = strtok(NULL, "\n");
lastdetail = strrchr(detail, ' ');
if (lastdetail) {
if (strcmp(lastdetail, " LOGIN") == 0) {
*lastdetail++ = '\0';
action = 1;
} else if (strcmp(lastdetail, " LOGOUT") == 0) {
action = -1;
*lastdetail++ = '\0';
}
}
if (action == -1) {
session_logout(detail);
printf("%s OK message=\"Bye\"\n", index);
} else if (action == 1) {
session_login(detail);
printf("%s OK message=\"Welcome\"\n", index);
} else if (session_active(detail)) {
session_login(detail);
printf("%s OK\n", index);
} else if (default_action == 1) {
session_login(detail);
printf("%s ERR message=\"Welcome\"\n", index);
} else {
printf("%s ERR message=\"No session available\"\n", index);
}
}
shutdown_db();
return 0;
}
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