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/*
* P3Scan v2.3.2
*
* (C) 2003-2005 by Jack S. Lai <laitcg@cox.net>
*
* It's intent is to provide a follow on program to POP3-Virusscan-Proxy 0.4
* by Folke Ashberg <folke@ashberg.de>.
*
* It is based upon his program but provides numerous changes to include
* scanning pop3 mail for spam, hardening the program, addaption to todays
* email environment, and many other changes.
*
* The initial release of p3scan includes patches made and submitted to the
* original project but were never incorporated. Please see the README for
* further information.
*
* 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
*
* This program is released under the GPL with the additional exemption that
* compiling, linking, and/or using OpenSSL is allowed."
* (http://www.openssl.org/support/faq.html#LEGAL2)
*
*/
#include <stdio.h>
#include <malloc.h>
#include <sys/un.h>
#include <sys/socket.h>
/* we need p3scan.h */
#include "p3scan.h"
/* place some definitions */
#define DEFAULT_SOCKET_PATH "/var/run/xyz-scanner.sock"
extern void * w_malloc(size_t bytes);
extern void w_free(void *f_address);
/* usually we need p3scan's config, so make it global */
struct configuration_t * config;
/* if you need some globals, make them static! */
static int connected;
struct sockaddr_un scanner_socket;
/* if you need some functions, make them static */
static int function(void){
return 0;
}
/* If you need initialization, use init1 . It is called after config parsing,
* setuid and daemonizing. You can check the parameters (config->xxxx), set
* defaults if nothing is given, and so on.
*
* Return values:
* -1 : Error. Scanning will be completely disabled.
* No further functions (init2, scan, uninit1, uninit2) will be called
* 0 : OK
*/
static int init1(void){
do_log(LOG_DEBUG, "SAMPLE Init1");
if (strlen(NONULL(config->virusscanner))<1){
do_log(LOG_CRIT, "no scanner was defined. we're using " DEFAULT_SOCKET_PATH);
config->virusscanner=strdup(DEFAULT_SOCKET_PATH);
}
do_log(LOG_DEBUG, "AVP Init1 Done");
return 0;
}
/* If you need initialization before scanning, use init2. Init2 is called before
* the first mail has to be scanned (not when a client only checks if he has new
* mails). Here you can connect for example to a socket (which makes more sense
* then doing that in init1).
*
* Return values:
* -1 : Error. Scanning is temporarily disabled for further mails over that
* connection.
* No further functions (scan, uninit2) will be called, but uninit1.
* 0 : OK
*/
static int init2(struct proxycontext *p){
do_log(LOG_DEBUG, "Init2");
/* Connect to socket */
if (socket_connect(p)!=0) return -1;
do_log(LOG_DEBUG, "Init2 Done");
return 0;
}
/* if you need to uninitialize what init2 has initialized, use uninit2, which is
* called only if init2 is set and init2 was called!
*/
static void uninit2(struct proxycontext *p){
socket_close();
}
/* if you need to uninitialize when pop3vscan terminates, use uninit1, which is
* called only if init1 has returned 0 OR was not set.
*/
static void uninit1(void){
}
/* now the scanner...
* Depending on demime (can be configured by user) and dirscan (can only be set
* below in scanner_t by you) we have to scan the mailfile, a directory or the
* deMIMEd files.
*
* +--------+---------+--------------------------------------------------------+
* | demime | dirscan | |
* +--------+---------+--------------------------------------------------------+
* | 0 | 0 | scan is called once, p->scanthis points to p->mailfile |
* +--------+---------+--------------------------------------------------------+
* | 1 | 0 | scan is called for every MIME-file |
* | | | p->scanthis points to the actual file in maildir |
* +--------+---------+--------------------------------------------------------+
* | 1 | 1 | scan is called once, p->scanthis points to maildir |
* +--------+---------+--------------------------------------------------------+
* | 0 | 1 | when the user have not set dirscan, you will get |
* | | | p->scanthis pointing to mailfile |
* +--------+---------+--------------------------------------------------------+
*
* You can set virname to a description of the virus. If scan is invoked
* multiple times and if you should find more than one virus we append all
* virusnames together (seperated with ' & '). virname is not malloced (it
* wouldn't be char**). If you can't examime the virusname set it to NULL, when
* no virus is found you can let them untouched.
*
* Return Codes:
* SCANNER_RET_VIRUS : The file contains a virus
* SCANNER_RET_OK : The file contains NO virus
* SCANNER_RET_ERR : Can't say if it's a virus
*
* If scan is invoked multiple times, we automatically collect the returncodes,
* that means that if one of the files has a virus, then anything else is
* ignored (further ERRs and OKs).
*
*/
static int scan(struct proxycontext *p, char **virname){
int ret;
do_log(LOG_DEBUG, "SAMPLE scanner says hello");
ret=scanfile(p->scanthis, virname);
if (ret==3 || ret==4) ret = SCANNER_RET_VIRUS; /* virus */
else if (ret<0) ret=SCANNER_RET_ERR;
else ret = SCANNER_RET_OK;
do_log(LOG_DEBUG, "SAMPLE scanner says goodbye");
return ret;
}
/* Tell us your name (used for scannertype) and a brief description (shown at
* startup and in --help). Set the functions you need, or just NULL if not (and
* remove the above functions). For infos about dirscan see the scan()
* description above.
*
*/
scanner_t scanner_sample = {
"sample", /* name */
"A sample scanner frontend", /* description */
&init1, /* init1 (once, after startup) */
&init2, /* init2 (every connection before first mail) */
&scan, /* scan */
&uninit2, /* uninit2 */
&uninit1, /* uninit1 */
0 /* dirscan */
};
/*
* to tell p3scan that we exist, add scanner_sample.o to Makefile
* (append to OBJECTS) and define scanner_sample as extern in scanner.h and
* place them in scannerlist[]
*
* That's all! Happy coding! :)
*
*/
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