--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/smtp_in.c	Fri Sep 26 17:05:23 2008 +0200
@@ -0,0 +1,358 @@
+/*  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