qsmtpd.c File Reference

main part of Qsmtpd More...

#include <qsmtpd/qsmtpd.h>
#include <control.h>
#include <diropen.h>
#include <log.h>
#include <mmap.h>
#include <netio.h>
#include <qdns.h>
#include <qmaildir.h>
#include <qsmtpd/antispam.h>
#include <qsmtpd/commands.h>
#include <qsmtpd/qsauth.h>
#include <qsmtpd/qsdata.h>
#include <qsmtpd/starttls.h>
#include <qsmtpd/syntax.h>
#include <qsmtpd/userconf.h>
#include <sstring.h>
#include <tls.h>
#include <version.h>
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <syslog.h>
#include <unistd.h>

Macros
#define	_C(c, m, f, s, o)   { .name = c, .len = sizeof(c) - 1, .mask = m, .func = f, .state = s, .flags = o }

Functions
int	err_control (const char *fn)
	write and log error message if opening config file leads to an error More...
int	err_control2 (const char *msg, const char *fn)
	write and log error message if opening config file leads to an error More...
void	dieerror (int error)
static int	setup (void)
static int	connsetup (void)
void	freedata (void)
	free all ressources allocated for mail transaction
pid_t	fork_clean ()
	fork() but clean up internal structures More...
void	conn_cleanup (const int rc)
	clean up the allocated data and exit the process More...
static int	smtp_temperror (void)
static int	line_valid ()
static void	smtploop (void)
int	main (int argc, char **argv)

Variables
struct smtpcomm *	current_command
static struct smtpcomm	commands []
unsigned int	rcptcount
int	relayclient
char *	rcpthosts
off_t	rcpthsize
unsigned long	sslauth
unsigned long	databytes
unsigned int	goodrcpt
int	badbounce
struct xmitstat	xmitstat
const char **	globalconf
string	heloname
string	msgidhost
string	liphost
int	socketd = 1
unsigned long	comstate = 0x001
int	authhide
int	submission_mode
struct recip *	thisrecip
static int	flagbogus

Detailed Description

main part of Qsmtpd

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

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

static int connsetup ( void  )

static

initialize variables related to this connection

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

int err_control2	(	const char *	msg,
		const char *	fn
	)

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

Parameters

msg	additional message to log
fn	name of the file that caused the error

See also

err_control

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.

static int line_valid ( )

static

line_valid - check if input line contains only syntactically correct characters

Returns

: 0 on success, else error code

Variable Documentation

int authhide

hide source of authenticated mail

int badbounce

bounce message with more than one recipient

struct smtpcomm commands[]

static

Initial value:

= {
        _C("NOOP",      0xffff, smtp_noop,      -1, 0), 
        _C("QUIT",      0xfffd, smtp_quit,       0, 0), 
        _C("RSET",      0xfffd, smtp_rset,     0x1, 0),  
        _C("HELO",      0xfffd, smtp_helo,       0, 5), 
        _C("EHLO",      0xfffd, smtp_ehlo,       0, 5), 
        _C("MAIL FROM:",0x0018, smtp_from,       0, 3), 
        _C("RCPT TO:",  0x0060, smtp_rcpt,       0, 1), 
        _C("DATA",      0x0040, smtp_data,    0x10, 0),  
        _C("STARTTLS",  0x0010, smtp_starttls, 0x1, 0), 
        _C("AUTH",      0x0010, smtp_auth,      -1, 5), 
        _C("VRFY",      0xffff, smtp_vrfy,      -1, 5), 



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

unsigned long comstate = 0x001

status of the command state machine, initialized to noop

struct smtpcomm* current_command

the SMTP command currently processed

unsigned long databytes

maximum message size

const char** globalconf

contents of the global "filterconf" file (or NULL)

unsigned int goodrcpt

number of valid recipients

string heloname

the fqdn to show in helo

string liphost

replacement domain if TO address is <foo@[ip]>

string msgidhost

the fqdn to use if a message-id is added

unsigned int rcptcount

number of recipients in lists including rejected

char* rcpthosts

memory mapping of control/rcpthosts

off_t rcpthsize

sizeof("control/rcpthosts")

int relayclient

flag if this client is allowed to relay by IP: 0 unchecked, 1 allowed, 2 denied

int socketd = 1

the descriptor where messages to network are written to

unsigned long sslauth

if SMTP AUTH is only allowed after STARTTLS

int submission_mode

if we should act as message submission agent

struct xmitstat xmitstat

This contains some flags describing the transmission and it's status.