main part of Qsmtpd More...

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/file.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <syslog.h>
#include <dirent.h>
#include <signal.h>
#include "antispam.h"
#include "log.h"
#include "netio.h"
#include "qdns.h"
#include "control.h"
#include "userfilters.h"
#include "tls.h"
#include "sstring.h"
#include "qsmtpd.h"
#include "version.h"
#include "vpop.h"
#include "qsauth.h"
#include "qsdata.h"
#include "xtext.h"
#include "fmt.h"
#include "qmaildir.h"
#include "syntax.h"

Defines
#define	_C(c, l, m, f, s, o) { .name = c, .len = l, .mask = m, .func = f, .state = s, .flags = o }
#define	MAXRCPT 500
Functions
int	smtp_noop (void)
int	smtp_quit (void)
int	smtp_rset (void)
int	smtp_helo (void)
int	smtp_ehlo (void)
int	smtp_from (void)
int	smtp_rcpt (void)
int	smtp_vrfy (void)
int	smtp_starttls (void)
int	http_post (void)
int	err_control (const char *fn)
	write and log error message if opening config file leads to an error
void	dieerror (int error)
void	freedata (void)
	free all ressources allocated for mail transaction
pid_t	fork_clean ()
	fork() but clean up internal structures
void	conn_cleanup (const int rc)
	clean up the allocated data and exit the process
int	main (int argc, char **argv)
Variables
struct smtpcomm	commands []
int	relayclient
unsigned long	sslauth
unsigned long	databytes
unsigned int	goodrcpt
int	badbounce
struct xmitstat	xmitstat
char *	protocol
const char *	auth_host
const char *	auth_check
const char **	auth_sub
const char **	globalconf
string	heloname
string	msgidhost
string	liphost
int	socketd = 1
long	comstate = 0x001
int	authhide
int	submission_mode
struct recip *	thisrecip

Detailed Description

main part of Qsmtpd

This file contains the main function and the basic commands of Qsmtpd SMTP server.

Define Documentation

#define MAXRCPT 500

maximum number of recipients in a single mail

Function Documentation

void conn_cleanup ( const int rc )

clean up the allocated data and exit the process

Parameters:

rc	desired return code of the process

void dieerror ( int error )

log error message and terminate program

Parameters:

error error code that caused the program termination

int err_control ( const char * fn )

write and log error message if opening config file leads to an error

Parameters:

fn	name of the file that caused the error

See also:: err_control2

pid_t fork_clean ( )

fork() but clean up internal structures

This will work exactly like fork(). If it returns 0 (i.e. you are the child) it will also clean the memory mappings etc. of the Qsmtpd process that the child doesn't need.

int http_post ( void )

http_post - handle HTTP POST request

This has nothing to do with SMTP at all. But I have seen many proxy attempts trying to send spam and beginning the connection with a sequence like this:

> POST / HTTP/1.0 > Via: 1.0 SERVEUR > Host: mail.sf-mail.de:25 > Content-Length: 1255 > Content-Type: text/plain > Connection: Keep-Alive > > RSET

This function is only there to handle this connections and drop them as early as possible to save our traffic.

int smtp_starttls ( void )

initialize STARTTLS mode

Returns:: 0 on successful initialization, else error code

Variable Documentation

const char* auth_check

checkpassword or one of his friends for auth

const char* auth_host

hostname for auth

const char** auth_sub

subprogram to be invoked by auth_check (usually /bin/true)

int authhide

hide source of authenticated mail

int badbounce

bounce message with more than one recipient

struct smtpcomm commands[]

Initial value:

 {
        _C("NOOP",       4, 0xffff, smtp_noop,     -1, 0),  
        _C("QUIT",       4, 0xfffd, smtp_quit,      0, 0),  
        _C("RSET",       4, 0xfffd, smtp_rset,    0x1, 0),   
        _C("HELO",       4, 0xfffd, smtp_helo,      0, 1),  
        _C("EHLO",       4, 0xfffd, smtp_ehlo,      0, 1),  
        _C("MAIL FROM:",10, 0x0018, smtp_from,      0, 3),  
        _C("RCPT TO:",   8, 0x0060, smtp_rcpt,      0, 1),  
        _C("DATA",       4, 0x0040, smtp_data,   0x10, 0),   
        _C("STARTTLS",   8, 0x0010, smtp_starttls, 0x1, 0), 
        _C("AUTH",       4, 0x0010, smtp_auth,     -1, 1),  
        _C("VRFY",       4, 0xffff, smtp_vrfy,     -1, 1),  



        _C("POST",       4, 0xffff, http_post,     -1, 1)    
}