/* MasqMail
Copyright (C) 1999-2001 Oliver Kurth
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.
*/
#include "masqmail.h"
#include "readsock.h"
/*
I always forget these rfc numbers:
RFC 821 (SMTP)
RFC 1869 (ESMTP)
RFC 1870 (ESMTP SIZE)
RFC 2197 (ESMTP PIPELINE)
RFC 2554 (ESMTP AUTH)
*/
#ifdef ENABLE_SMTP_SERVER
smtp_cmd smtp_cmds[] =
{
{ SMTP_HELO, "HELO", },
{ SMTP_EHLO, "EHLO", },
{ SMTP_MAIL_FROM, "MAIL FROM:", },
{ SMTP_RCPT_TO, "RCPT TO:", },
{ SMTP_DATA, "DATA", },
{ SMTP_QUIT, "QUIT", },
{ SMTP_RSET, "RSET", },
{ SMTP_NOOP, "NOOP", },
{ SMTP_HELP, "HELP" },
};
static
smtp_cmd_id get_id(const gchar *line)
{
gint i;
for(i = 0; i < SMTP_NUM_IDS; i++){
if(strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0)
return (smtp_cmd_id)i;
}
return SMTP_ERROR;
}
/* this is a quick hack: we expect the address to be syntactically correct
and containing the mailbox only:
*/
static
gboolean get_address(gchar *line, gchar *addr)
{
gchar *p = line, *q = addr;
/* skip MAIL FROM: and RCPT TO: */
while(*p && (*p != ':')) p++;
p++;
/* skip spaces: */
while(*p && isspace(*p)) p++;
/* get address: */
while(*p && !isspace(*p) && (q < addr+MAX_ADDRESS-1)) *(q++) = *(p++);
*q = 0;
return TRUE;
}
static
smtp_connection *create_base(gchar *remote_host)
{
smtp_connection *base = g_malloc(sizeof(smtp_connection));
if(base){
base->remote_host = g_strdup(remote_host);
base->prot = PROT_SMTP;
base->next_id = 0;
base->helo_seen = 0;
base->from_seen = 0;
base->rcpt_seen = 0;
base->msg = NULL;
return base;
}
return NULL;
}
static
void smtp_printf(FILE *out, gchar *fmt, ...)
{
va_list args;
va_start(args, fmt);
DEBUG(4){
gchar buf[256];
va_list args_copy;
va_copy(args_copy, args);
vsnprintf(buf, 255, fmt, args_copy);
va_end(args_copy);
debugf(">>>%s", buf);
}
vfprintf(out, fmt, args); fflush(out);
va_end(args);
}
void smtp_in(FILE *in, FILE *out, gchar *remote_host, gchar *ident)
{
gchar *buffer;
smtp_cmd_id cmd_id;
message *msg = NULL;
smtp_connection *psc;
int len;
DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);
psc = create_base(remote_host);
psc->msg = msg;
buffer = (gchar *)g_malloc(BUF_LEN);
if(buffer){
/* send greeting string, containing ESMTP: */
smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n",
conf.host_name, VERSION);
while((len = read_sockline(in, buffer, BUF_LEN, 5*60, READSOCKL_CHUG)) >= 0){
cmd_id = get_id(buffer);
switch(cmd_id){
case SMTP_EHLO:
psc->prot = PROT_ESMTP;
/* fall through */
case SMTP_HELO:
psc->helo_seen = TRUE;
if(!conf.defer_all){ /* I need this to debug delivery failures */
if(psc->prot == PROT_ESMTP){
smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n",
conf.host_name);
/* not yet: fprintf(out, "250-SIZE\r\n"); */
smtp_printf(out,
"250-PIPELINING\r\n"
"250 HELP\r\n");
}else{
smtp_printf(out, "250 %s pretty old mailer, huh?\r\n",
conf.host_name);
}
break;
}else{
smtp_printf(out, "421 %s service temporarily unavailable.\r\n",
conf.host_name);
}
case SMTP_MAIL_FROM:
if(psc->helo_seen && !psc->from_seen){
gchar buf[MAX_ADDRESS];
address *addr;
msg = create_message();
msg->received_host = remote_host ? g_strdup(remote_host) : NULL;
msg->received_prot = psc->prot;
msg->ident = ident ? g_strdup(ident) : NULL;
/* get transfer id and increment for next one */
msg->transfer_id = (psc->next_id)++;
get_address(buffer, buf);
if((addr = remote_host ?
create_address(buf, TRUE) :
create_address_qualified(buf, TRUE, conf.host_name))){
if(addr->domain != NULL){
psc->from_seen = TRUE;
msg->return_path = addr;
smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);
}else{
smtp_printf(out,
"501 return path must be qualified.\r\n", buf);
}
}else{
smtp_printf(out, "501 %s: syntax error.\r\n", buf);
}
}else{
if(!psc->helo_seen)
smtp_printf(out, "503 need HELO or EHLO\r\n");
else
smtp_printf(out, "503 MAIL FROM: already given.\r\n");
}
break;
case SMTP_RCPT_TO:
if(psc->helo_seen && psc->from_seen){
char buf[MAX_ADDRESS];
address *addr;
get_address(buffer, buf);
if((addr = remote_host ?
create_address(buf, TRUE) :
create_address_qualified(buf, TRUE, conf.host_name))){
if(addr->local_part[0] != '|'){
if(addr->domain != NULL){
gboolean do_relay = conf.do_relay;
if(!do_relay){
if((do_relay = addr_is_local(msg->return_path)));
if(!do_relay){
do_relay = addr_is_local(addr);
}
}
if(do_relay){
psc->rcpt_seen = TRUE;
msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);
}else{
smtp_printf(out, "550 relaying to %s denied.\r\n",
addr_string(addr));
}
}else{
smtp_printf(out,
"501 recipient address must be qualified.\r\n", buf);
}
}else
smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);
}else{
smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);
}
}else{
if(!psc->helo_seen)
smtp_printf(out, "503 need HELO or EHLO.\r\n");
else
smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");
}
break;
case SMTP_DATA:
if(psc->helo_seen && psc->rcpt_seen){
accept_error err;
smtp_printf(out, "354 okay, and do not forget the dot\r\n");
if((err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0))
== AERR_OK){
if(spool_write(msg, TRUE)){
pid_t pid;
smtp_printf(out, "250 OK id=%s\r\n", msg->uid);
if(remote_host != NULL)
logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n",
msg->uid, msg->return_path->local_part,
msg->return_path->domain, remote_host,
prot_names[psc->prot]);
else
logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n",
msg->uid, msg->return_path->local_part,
msg->return_path->domain,
prot_names[psc->prot]);
if(!conf.do_queue){
if((pid = fork()) == 0){
if(deliver(msg))
_exit(EXIT_SUCCESS);
else
_exit(EXIT_FAILURE);
}else if(pid < 0){
logwrite(LOG_ALERT, "could not fork for delivery, id = %s",
msg->uid);
}
}else{
DEBUG(1) debugf("queuing forced by configuration or option.\n");
}
}else{
smtp_printf(out, "451 Could not write spool file\r\n");
return;
}
}else{
switch(err){
case AERR_TIMEOUT:
return;
case AERR_EOF:
return;
default:
/* should never happen: */
smtp_printf(out, "451 Unknown error\r\n");
return;
}
}
psc->rcpt_seen = psc->from_seen = FALSE;
destroy_message(msg);
msg = NULL;
}else{
if(!psc->helo_seen)
smtp_printf(out, "503 need HELO or EHLO.\r\n");
else
smtp_printf(out, "503 need RCPT TO: before DATA\r\n");
}
break;
case SMTP_QUIT:
smtp_printf(out, "221 goodbye\r\n");
if(msg != NULL) destroy_message(msg);
return;
case SMTP_RSET:
psc->from_seen = psc->rcpt_seen = FALSE;
if(msg != NULL)
destroy_message(msg);
msg = NULL;
smtp_printf(out, "250 OK\r\n");
break;
case SMTP_NOOP:
smtp_printf(out, "250 OK\r\n");
break;
case SMTP_HELP:
{
int i;
smtp_printf(out, "214-supported commands:\r\n");
for(i = 0; i < SMTP_NUM_IDS-1; i++){
smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);
}
smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);
}
break;
default:
smtp_printf(out, "501 command not recognized\r\n");
DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);
break;
}
}
switch(len){
case -3:
logwrite(LOG_NOTICE, "connection timed out\n");
break;
case -2:
logwrite(LOG_NOTICE, "line overflow\n");
break;
case -1:
logwrite(LOG_NOTICE, "received EOF\n");
break;
default:
break;
}
}
}
#endif
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