source: npl/mailserver/dspam/dspam-3.10.2/src/daemon.c @ 28afc38

/* $Id: daemon.c,v 1.23 2012/02/09 22:05:07 sbajic Exp $ */

/*
 DSPAM
 COPYRIGHT (C) 2002-2012 DSPAM PROJECT

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as
 published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.

 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

/*
 * daemon.c - server daemon codebase (for operating in client/daemon mode)
 *
 * DESCRIPTION
 *   The code in this section is responsible for managing the DSPAM agent as
 *   a server-side process when --daemon is called. It ties in with many
 *   standard agent processing functions..
 */

#ifdef HAVE_CONFIG_H
#include <auto-config.h>
#endif

#ifdef DAEMON

#define RSET(A) ( A && !strcmp(A, "RSET") )

#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <error.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/resource.h>
#include <sys/un.h>
#include <netdb.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <signal.h>

#ifndef _WIN32
#include <unistd.h>
#include <pwd.h>
#endif

#include <stdio.h>
#include <fcntl.h>

#include "daemon.h"
#include "client.h"
#include "dspam.h"
#include "libdspam.h"
#include "config.h"
#include "util.h"
#include "buffer.h"
#include "language.h"

/*
 * daemon_listen(DRIVER_CTX *DTX)
 *
 * DESCRIPTION
 *   primary daemon loop
 *
 *   this function is called by the agent when --daemon is specified on the
 *   commandline, and is responsible for innitializing and managing core daemon
 *   services. these include listening for and accepting incoming connections
 *   and spawning new protocol handler threads.
 *
 * INPUT ARGUMENTS
 *     DTX    driver context (containing cached database connections)
 *
 * RETURN VALUES
 *   returns 0 on success
 */

int daemon_listen(DRIVER_CTX *DTX) {
  struct sockaddr_in local_addr, remote_addr;
  THREAD_CTX *TTX = NULL;
  fd_set master, read_fds;
  pthread_attr_t attr;
  struct timeval tv;
  int fdmax, yes = 1;
  int domain = 0;               /* listening on domain socket? */
  int listener;                 /* listener fd */
  int i;
  int port = 24, queue = 32;    /* default port and queue size */

  signal(SIGPIPE, SIG_IGN);
  signal(SIGINT,  process_signal);
  signal(SIGTERM, process_signal);
  signal(SIGHUP,  process_signal);

  if (_ds_read_attribute(agent_config, "ServerPort"))
    port = atoi(_ds_read_attribute(agent_config, "ServerPort"));

  if (_ds_read_attribute(agent_config, "ServerQueueSize"))
    queue = atoi(_ds_read_attribute(agent_config, "ServerQueueSize"));

  if (_ds_read_attribute(agent_config, "ServerDomainSocketPath"))
    domain = 1;

  /* initialize */

  FD_ZERO(&master);
  FD_ZERO(&read_fds);

  pthread_attr_init(&attr);
  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

  /* Bind (domain socket) */

  if (domain) {
    struct sockaddr_un saun;
    char *address = _ds_read_attribute(agent_config, "ServerDomainSocketPath");
    mode_t mask;
    int len;

    mask = umask (000);

    listener = socket(AF_UNIX, SOCK_STREAM, 0);
    if (listener == -1) {
      LOG(LOG_CRIT, ERR_DAEMON_SOCKET, strerror(errno));
      umask (mask);
      return(EFAILURE);
    }

    memset(&saun, 0, sizeof(struct sockaddr_un));
    saun.sun_family = AF_UNIX;
    strcpy(saun.sun_path, address);

    unlink(address);
    len = sizeof(saun.sun_family) + strlen(saun.sun_path) + 1;

    LOGDEBUG(INFO_DAEMON_DOMAINSOCK, address);
  
    if (bind(listener, (struct sockaddr *) &saun, len)<0) {
      close(listener);
      LOG(LOG_CRIT, INFO_DAEMON_DOMAINSOCK, address, strerror(errno));
      umask (mask);
      return EFAILURE;
    }    

    umask (mask);

  /* Bind to a TCP socket */

  } else {
    listener = socket(AF_INET, SOCK_STREAM, 0);
    if (listener == -1) {
      LOG(LOG_CRIT, ERR_DAEMON_SOCKET, strerror(errno));
      return(EFAILURE);
    }

    if (setsockopt(listener,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
      close(listener);
      LOG(LOG_CRIT, ERR_DAEMON_SOCKOPT, "SO_REUSEADDR", strerror(errno));
      return(EFAILURE);
    }

    memset(&local_addr, 0, sizeof(struct sockaddr_in));
    local_addr.sin_family = AF_INET;
    local_addr.sin_port = htons(port);
    if (_ds_read_attribute(agent_config, "ServerHost")) {
      char *host = _ds_read_attribute(agent_config, "ServerHost");
      local_addr.sin_addr.s_addr = inet_addr(host);
      LOGDEBUG(INFO_DAEMON_BIND, host, port);
    } else {
      local_addr.sin_addr.s_addr = INADDR_ANY;
      LOGDEBUG(INFO_DAEMON_BIND, "*", port);
    }

    if (bind(listener, (struct sockaddr *)&local_addr, 
             sizeof(struct sockaddr)) == -1) 
    {
      close(listener);
      LOG(LOG_CRIT, ERR_DAEMON_BIND, port, strerror(errno));
      return(EFAILURE);
    }
  }

  /* Listen */

  if (listen(listener, queue) == -1) {
    close(listener);
    LOG(LOG_CRIT, ERR_DAEMON_LISTEN, strerror(errno));
    return(EFAILURE);
  }

  FD_SET(listener, &master);
  fdmax = listener;

  /* Process new connections (until death or reload) */

  for(;;) {
    read_fds = master;
    tv.tv_sec = 2;
    tv.tv_usec = 0;

    if (__daemon_run == 0) {
      close(listener);

      if (_ds_read_attribute(agent_config, "ServerDomainSocketPath"))
        unlink (_ds_read_attribute(agent_config, "ServerDomainSocketPath"));
      
      return 0; 
    }

    if (select(fdmax+1, &read_fds, NULL, NULL, &tv)>0) {

      /* Process read-ready connections */

      for(i=0;i<=fdmax;i++) {
        if (FD_ISSET(i, &read_fds)) {

          /* Accept new connections */

          if (i == listener) {
            int newfd;
            int addrlen = sizeof(remote_addr);

            if ((newfd = accept(listener, 
                                (struct sockaddr *)&remote_addr, 
                                (socklen_t *) &addrlen)) == -1)
            {
              LOG(LOG_WARNING, ERR_DAEMON_ACCEPT, strerror(errno));
              continue;
#ifdef DEBUG
            } else if (!domain) {
              char buff[32];
              LOGDEBUG("connection id %d from %s.", newfd, 
#ifdef HAVE_INET_NTOA_R_2
                       inet_ntoa_r(remote_addr.sin_addr, buff)
#else
                       inet_ntoa_r(remote_addr.sin_addr, buff, sizeof(buff))
#endif
                      );
#endif
            }
            fcntl(newfd, F_SETFL, O_RDWR);
            setsockopt(newfd,SOL_SOCKET,TCP_NODELAY,&yes,sizeof(int));

            /* 
             * Since processing time varies, each new connection gets its own 
             * thread, so we create a new thread context and send it on its way 
             *
             */

            TTX = calloc(1, sizeof(THREAD_CTX));
            if (TTX == NULL) {
              LOG(LOG_CRIT, ERR_MEM_ALLOC);
              close(newfd);
              continue;
            } else {
              TTX->sockfd = newfd;
              TTX->DTX = DTX;
              memcpy(&TTX->remote_addr, &remote_addr, sizeof(remote_addr));

              increment_thread_count();
              if (pthread_create(&TTX->thread, 
                                 &attr, process_connection, (void *) TTX))
              {
                decrement_thread_count();
                LOG(LOG_CRIT, ERR_DAEMON_THREAD, strerror(errno));
                close(TTX->sockfd);
                free(TTX);
                continue;
              }
            }
          } /* if i == listener */
        } /* if FD_SET else */
      } /* for(i.. */
    }  /* if (select)... */
  } /* for(;;) */

  /* Shutdown - we should never get here, but who knows */

  close(listener);
  pthread_attr_destroy(&attr);
  return 0;
}

/*
 * process_connection(void *ptr)
 *
 * DESCRIPTION
 *   process a connection after establishment
 *
 *  this function instantiates for each thread at the beginning of a connection
 *  and is the hub for a connection's processing.
 *
 * INPUT ARGUMENTS
 *      ptr    thread context (TTX)
 *
 * RETURN VALUES
 *   returns NULL on success
 *
 */

void *process_connection(void *ptr) {
  char *server_ident = _ds_read_attribute(agent_config, "ServerIdent");
  THREAD_CTX *TTX = (THREAD_CTX *) ptr;
  AGENT_CTX *ATX = NULL;
  char *input, *cmdline = NULL, *token, *ptrptr;
  buffer *message = NULL;
  char *parms=NULL, *p=NULL;
  int i, locked = -1, invalid = 0;
  int server_mode = SSM_DSPAM;
  char *argv[64];
  char buf[1024];
  int tries = 0;
  int argc = 0;
  FILE *fd = 0;

  if (_ds_read_attribute(agent_config, "ServerMode") &&
      !strcasecmp(_ds_read_attribute(agent_config, "ServerMode"), "standard"))
  {
    server_mode = SSM_STANDARD;
  }

  if (_ds_read_attribute(agent_config, "ServerMode") &&
      !strcasecmp(_ds_read_attribute(agent_config, "ServerMode"), "auto"))
  {
    server_mode = SSM_AUTO;
  }

  /* Initialize a file descriptor hook for dspam to use as stdout */

  fd = fdopen(TTX->sockfd, "w");
  if (!fd) {
    close(TTX->sockfd);
    goto CLOSE;
  }
  setbuf(fd, NULL);

  TTX->packet_buffer = buffer_create(NULL);
  if (TTX->packet_buffer == NULL)
    goto CLOSE;

  /* 
   *  Send greeting banner
   *  in auto mode, we want to look like a regular LMTP server so we don't
   *  cause any compatibility problems. in dspam mode, we can change this.  
   */

  snprintf(buf, sizeof(buf), "%d DSPAM %sLMTP %s %s", 
    LMTP_GREETING, 
    (server_mode == SSM_DSPAM) ? "D" : "",
    VERSION, 
    (server_mode == SSM_DSPAM) ? "Authentication Required" : "Ready");
  if (send_socket(TTX, buf)<=0) 
    goto CLOSE;

  TTX->authenticated = 0;

  /* LHLO */

  input = daemon_expect(TTX, "LHLO");
  if (input == NULL)
    goto CLOSE;
  if (server_mode == SSM_AUTO && input[4]) {
    char buff[128];

    /*
     *  Auto-detect the server mode based on whether or not the ident is
     *  assigned a password in dspam.conf 
     */

    snprintf(buff, sizeof(buff), "ServerPass.%s", input + 5);
    chomp(buff);
    if (_ds_read_attribute(agent_config, buff))
      server_mode = SSM_DSPAM;
    else
      server_mode = SSM_STANDARD;
  }
  free(input);

  /* Advertise extensions */

  if (daemon_extension(TTX, (server_ident) ? server_ident : 
      "localhost.localdomain")<=0)
    goto CLOSE;

  if (daemon_extension(TTX, "PIPELINING")<=0)
    goto CLOSE;

  if (daemon_extension(TTX, "ENHANCEDSTATUSCODES")<=0)
    goto CLOSE;

  if (server_mode == SSM_DSPAM)
    if (daemon_extension(TTX, "DSPAMPROCESSMODE")<=0)
      goto CLOSE;

  if (daemon_extension(TTX, "8BITMIME")<=0)
    goto CLOSE;

  if (daemon_reply(TTX, LMTP_OK, "", "SIZE")<=0)
    goto CLOSE;

  /* Main protocol loop */

  while(1) {
    char processmode[256];
    parms = NULL;

    /* Configure a new agent context for each pass */

    ATX = calloc(1, sizeof(AGENT_CTX));
    if (ATX == NULL) {
      LOG(LOG_CRIT, ERR_MEM_ALLOC);
      daemon_reply(TTX, LMTP_TEMP_FAIL, "4.3.0", ERR_MEM_ALLOC);
      goto CLOSE;
    }

    if (initialize_atx(ATX)) {
      LOG(LOG_ERR, ERR_AGENT_INIT_ATX);
      daemon_reply(TTX, LMTP_BAD_CMD, "5.3.0", ERR_AGENT_INIT_ATX);
      goto CLOSE;
    }

    /* MAIL FROM (and authentication, if SSM_DSPAM) */

    processmode[0] = 0;
    while(!TTX->authenticated) {
      input = daemon_expect(TTX, "MAIL FROM");

      if (RSET(input))
        goto RSET;

      if (input == NULL) 
        goto CLOSE;
      else {
        char *pass, *ident;
        chomp(input);

        if (server_mode == SSM_STANDARD) {
          TTX->authenticated = 1;

          ATX->mailfrom[0] = 0;
          _ds_extract_address(ATX->mailfrom, input, sizeof(ATX->mailfrom));

          if (daemon_reply(TTX, LMTP_OK, "2.1.0", "OK")<=0) {
            free(input);
            goto CLOSE;
          }
        } else {
          char id[256];
          pass = ident = NULL;
          id[0] = 0;
          if (!_ds_extract_address(id, input, sizeof(id))) {
            pass = strtok_r(id, "@", &ptrptr);
            ident = strtok_r(NULL, "@", &ptrptr);
          }

          if (pass && ident) {
            char *serverpass;
            char *ptr, *ptr2, *ptr3;
  
            snprintf(buf, sizeof(buf), "ServerPass.%s", ident);
            serverpass = _ds_read_attribute(agent_config, buf);
  
            snprintf(buf, sizeof(buf), "ServerPass.%s", ident);
            if (serverpass && !strcmp(pass, serverpass)) {
              TTX->authenticated = 1;

              /* Parse PROCESSMODE service tag */
 
              ptr = strstr(input, "DSPAMPROCESSMODE=\"");
              if (ptr) {
                char *mode;
                int i;
                ptr2 = strchr(ptr, '"')+1;
                mode = ptr2;
                while((ptr3 = strstr(ptr2, "\\\""))) 
                  ptr2 = ptr3+2;
                ptr3 = strchr(ptr2+2, '"');
                if (ptr3)
                  ptr3[0] = 0;
                strlcpy(processmode, mode, sizeof(processmode)); 
                
                ptr = processmode;
                for(i=0;ptr[i];i++) {
                  if (ptr[i] == '\\' && ptr[i+1] == '"') {
                    strcpy(ptr+i, ptr+i+1);
                  }
                }
                LOGDEBUG("process mode: '%s'", processmode);
              }
                
              if (daemon_reply(TTX, LMTP_OK, "2.1.0", "OK")<=0) {
                free(input);
                goto CLOSE;
              }
            } 
          }
        }

        free(input);
        if (!TTX->authenticated) {
          LOGDEBUG("fd %d authentication failure.", TTX->sockfd);

          if (daemon_reply(TTX, LMTP_AUTH_ERROR, "5.1.0", 
              "Authentication Required")<=0) 
          {
            free(input);
            goto CLOSE;
          }
         
          tries++;
          if (tries>=3) {
            struct timeval tv;
            tv.tv_sec = 5;
            tv.tv_usec = 0;
            select(0, NULL, NULL, NULL, &tv);
            goto CLOSE;
          }
        }
      }
    }
  
    /* MAIL FROM response */

    snprintf(buf, sizeof(buf), "%d OK", LMTP_OK);

    argc = 1;
    argv[0] = "dspam";
    argv[1] = 0;

    /* Load open-LMTP configuration parameters */

    if (server_mode == SSM_STANDARD) {
      parms = _ds_read_attribute(agent_config, "ServerParameters");
      if (parms) {
        p = strdup(parms);
        if (p) {
          token = strtok_r(p, " ", &ptrptr);
          while(token != NULL && argc<63) {
            argv[argc] = token;
            argc++;
            argv[argc] = 0;
            token = strtok_r(NULL, " ", &ptrptr);
          }
        }
      }
    }

    /* RCPT TO */

    while(ATX->users->items == 0 || invalid) {
      free(cmdline);
      cmdline = daemon_getline(TTX, 300);
 
      while(cmdline && 
            (!strncasecmp(cmdline, "RCPT TO:", 8) ||
             !strncasecmp(cmdline, "RSET", 4)))
      {
        char username[256];
        char *at = NULL;

        if (!strncasecmp(cmdline, "RSET", 4)) {
          snprintf(buf, sizeof(buf), "%d OK", LMTP_OK);
          if (send_socket(TTX, buf)<=0)
            goto CLOSE; 
          goto RSET;
        }

        if (_ds_extract_address(username, cmdline, sizeof(username)) ||
            username[0] == 0 || username[0] == '-' || username[0] == '@')
        {
          if ((server_mode == SSM_DSPAM) || (server_mode == SSM_STANDARD && _ds_validate_address(username) == 0)) {
            daemon_reply(TTX, LMTP_BAD_CMD, "5.1.2", ERR_LMTP_BAD_RCPT);
            goto GETCMD;
          }
        }

        if (_ds_match_attribute(agent_config, "Broken", "case"))
          lc(username, username);

        /* Chop of @.* from the recipient */
        if (_ds_match_attribute(agent_config, "StripRcptDomain", "on")) {
          at = strchr(username, '@');
          if (at != NULL)
            *at = '\0';
        }

        if (server_mode == SSM_DSPAM) {
          nt_add(ATX->users, username);
        }
        else {
          if (!parms || !strstr(parms, "--user ")) 
            nt_add(ATX->users, username);

          if (!ATX->recipients) {
            ATX->recipients = nt_create(NT_CHAR);
            if (ATX->recipients == NULL) {
              LOG(LOG_CRIT, ERR_MEM_ALLOC);
              goto CLOSE;
            }
          }
          if (at != NULL)
            *at = '@'; /* always add complete address (user@domain) to recipient list */
          nt_add(ATX->recipients, username);
        }

        if (daemon_reply(TTX, LMTP_OK, "2.1.5", "OK")<=0)
          goto CLOSE;

GETCMD:
        free(cmdline);
        cmdline = daemon_getline(TTX, 300);
      }

      if (cmdline == NULL)
        goto CLOSE;

      if (!strncasecmp(cmdline, "RSET", 4)) {
        snprintf(buf, sizeof(buf), "%d OK", LMTP_OK);
        if (send_socket(TTX, buf)<=0)
          goto CLOSE;
        goto RSET;
      }

      if (!strncasecmp(cmdline, "quit", 4)) {
        daemon_reply(TTX, LMTP_OK, "2.0.0", "OK");
        goto CLOSE;
      }

      /* Parse DSPAMPROCESSMODE input and set up process arguments */
 
      if (server_mode == SSM_DSPAM && processmode[0] != 0) {
        token = strtok_r(processmode, " ", &ptrptr);
        while(token != NULL && argc<63) {
          argv[argc] = token;
          argc++;
          argv[argc] = 0;
          token = strtok_r(NULL, " ", &ptrptr);
        }
      }

      invalid = 0;
      if (process_arguments(ATX, argc, argv) || apply_defaults(ATX))
      {
        LOG(LOG_ERR, ERR_AGENT_INIT_ATX);
        daemon_reply(TTX, LMTP_NO_RCPT, "5.1.0", ERR_AGENT_INIT_ATX);
        invalid = 1;
      } else if (ATX->users->items == 0) {
        daemon_reply(TTX, LMTP_NO_RCPT, "5.1.1", ERR_AGENT_USER_UNDEFINED);
      }
    }

    ATX->sockfd = fd;
    ATX->sockfd_output = 0;

    /* Something's terribly misconfigured */

    if (check_configuration(ATX)) {
      LOG(LOG_ERR, ERR_AGENT_MISCONFIGURED);
      daemon_reply(TTX, LMTP_BAD_CMD, "5.3.5", ERR_AGENT_MISCONFIGURED);
      goto CLOSE;
    }

    /* DATA */

    if (cmdline != NULL) {
      if (strncasecmp(cmdline, "DATA", 4)) {
        if (daemon_reply(TTX, LMTP_BAD_CMD, "5.0.0", "Need DATA Here")<0)
          goto CLOSE;
        input = daemon_expect(TTX, "DATA");
        if (input == NULL)
          goto CLOSE;
        if (RSET(input))
          goto RSET;
      }
    }

    if (daemon_reply(TTX, LMTP_DATA, "", INFO_LMTP_DATA)<=0)
      goto CLOSE;
  
    /*
     *  Read in the message from a DATA. I personally like to just hang up on
     *  a client stupid enough to pass in a NULL message for DATA, but you're 
     *  welcome to do whatever you want. 
     */

    message = read_sock(TTX, ATX);
    if (message == NULL || message->data == NULL || message->used == 0) {
      daemon_reply(TTX, LMTP_FAILURE, "5.2.0", ERR_LMTP_MSG_NULL);
      goto CLOSE;
    }

    /*
     *  Lock a database handle. We currently use the modulus of the socket
     *  id against the number of database connections in the cache. This 
     *  seems to work rather well, as we would need to lock up the entire
     *  cache to wrap back around. And if we do wrap back around, that means
     *  we're busy enough to justify spinning on the current lock (vs. seeking
     *  out a free handle, which there likely are none).
     */

    i = (TTX->sockfd % TTX->DTX->connection_cache);
    LOGDEBUG("using database handle id %d", i);
    if (TTX->DTX->flags & DRF_RWLOCK) {
      if (ATX->operating_mode == DSM_CLASSIFY || 
          ATX->training_mode == DST_NOTRAIN   ||
          (ATX->training_mode == DST_TOE && ATX->classification == DSR_NONE))
      {
        pthread_rwlock_rdlock(&TTX->DTX->connections[i]->rwlock);
      } else {
        pthread_rwlock_wrlock(&TTX->DTX->connections[i]->rwlock);
      }
    } else {
      pthread_mutex_lock(&TTX->DTX->connections[i]->lock);
    }
    LOGDEBUG("handle locked");
    ATX->dbh = TTX->DTX->connections[i]->dbh;
    locked = i;

    /* Process the message by tying back into the agent functions */

    ATX->results = nt_create(NT_PTR);
    if (ATX->results == NULL) {
      LOG(LOG_CRIT, ERR_MEM_ALLOC);
      goto CLOSE;
    } 
    /* FIXME: this sends the message back to the client, but doesnt do the appropiate dot stuffing. */
    process_users(ATX, message);
  
    /*
     *  Unlock the database handle as soon as we're done. We also need to
     *  refresh our handle index with a new handle if for some reason we
     *  had to re-establish a dewedged connection.
     */

    if (TTX->DTX->connections[locked]->dbh != ATX->dbh) 
      TTX->DTX->connections[locked]->dbh = ATX->dbh;

    if (TTX->DTX->flags & DRF_RWLOCK) {
      pthread_rwlock_unlock(&TTX->DTX->connections[locked]->rwlock);
    } else {
      pthread_mutex_unlock(&TTX->DTX->connections[locked]->lock);
    }
    locked = -1;

    /* Send a terminating '.' if --stdout in 'dspam' mode */

    if (ATX->sockfd_output) {
      if (send_socket(TTX, ".")<=0)
        goto CLOSE;

    /* Otherwise, produce standard delivery results */

    } else {
      struct nt_node *node_nt, *node_res = NULL;
      struct nt_c c_nt;
      if (ATX->recipients)
        node_nt = c_nt_first(ATX->recipients, &c_nt);
      else
        node_nt = c_nt_first(ATX->users, &c_nt);

      if (ATX->results)
        node_res = ATX->results->first;

      while(node_res && node_nt != NULL) {
        agent_result_t result = (agent_result_t) node_res->ptr;

        if (result != NULL && result->exitcode == ERC_SUCCESS)
        {
          if (server_mode == SSM_DSPAM) {
            snprintf(buf, sizeof(buf),
                    "%d 2.6.0 <%s> Message accepted for delivery: %s",
                    LMTP_OK, (char *) node_nt->ptr, 
              (result->classification == DSR_ISSPAM) ? "SPAM" : "INNOCENT");
          } else {
            snprintf(buf, sizeof(buf),
                    "%d 2.6.0 <%s> Message accepted for delivery",
                    LMTP_OK, (char *) node_nt->ptr);
          }
        } 
        else
        {
          if (result != NULL && result->exitcode == ERC_PERMANENT_DELIVERY) {
            snprintf(buf, sizeof(buf), "%d 5.3.0 <%s> %s",
                 LMTP_FAILURE, (char *) node_nt->ptr,
                 (result->text[0]) ? result->text : "Permanent error occured");
          } else {
            if (result != NULL && result->text[0]) {
              snprintf(buf, sizeof(buf),
                       "%d 4.3.0 <%s> %s",
                       LMTP_TEMP_FAIL, (char *) node_nt->ptr, result->text);
            } else {
              snprintf(buf, sizeof(buf),
                       "%d 4.3.0 <%s> Error occured during %s", 
                       LMTP_TEMP_FAIL, (char *) node_nt->ptr,
                (result != NULL && result->exitcode == ERC_DELIVERY) ? "delivery" : "processing");
            }
          }
        }

        if (send_socket(TTX, buf)<=0) 
          goto CLOSE;
        if (ATX->recipients)
          node_nt = c_nt_next(ATX->recipients, &c_nt);
        else
          node_nt = c_nt_next(ATX->users, &c_nt);
        if (node_res)
          node_res = node_res->next;
      }
    }

    /* Cleanup and get ready for another message */

RSET:
    fflush(fd);

    buffer_destroy(message);
    message = NULL;
    if (ATX != NULL) {
      nt_destroy(ATX->users);
      nt_destroy(ATX->recipients);
      nt_destroy(ATX->results);
      free(ATX);
      ATX = NULL;
      free(cmdline);
      cmdline = NULL;
      TTX->authenticated = 0;
      /* argc = 0; */
    }

    free(p);
    p = NULL;

  } /* while(1) */

  /* Close connection and return */

CLOSE:
  if (locked>=0)
    pthread_mutex_unlock(&TTX->DTX->connections[locked]->lock);
  if (fd)
    fclose(fd);
  buffer_destroy(TTX->packet_buffer);
  if (message) 
    buffer_destroy(message);
  if (ATX != NULL) {
    nt_destroy(ATX->users);
    nt_destroy(ATX->recipients);
    nt_destroy(ATX->results);
  }
  free(ATX);
  free(cmdline);
  free(TTX);
  decrement_thread_count();
  pthread_exit(0);
  return 0;
}

/*
 * read_sock(THREAD_CTX *TTX, AGENT_CTX *ATX)
 *
 * DESCRIPTION
 *   read in a message via socket and perform standard parseto services
 *   this is a daemonized version of read_stdin, adding in timeouts and
 *   termination via '.'
 *
 * INPUT ARGUMENTS
 *      TTX    thread context
 *      ATX    agent context
 *
 * RETURN VALUES
 *   pointer to allocated buffer containing the message
 */

buffer * read_sock(THREAD_CTX *TTX, AGENT_CTX *ATX) {
  buffer *message;
  int body = 0, line = 1;
  char *buf;
  int strip = _ds_match_attribute(agent_config, "Broken", "lineStripping");
  int parseto = _ds_match_attribute(agent_config, "ParseToHeaders", "on");

  message = buffer_create(NULL);
  if (message == NULL) {
    LOG(LOG_CRIT, ERR_MEM_ALLOC);
    return NULL;
  }

  if (_ds_match_attribute(agent_config, "DataSource", "document")) {
    buffer_cat(message, ".\n\n");
    body = 1;
  }

  while ((buf = daemon_getline(TTX, 300))!=NULL) {
    chomp(buf);

    if (!strcmp(buf, ".")) {
      free(buf);
      return message;
    }

    if (strip) {
      size_t len = strlen(buf);
  
      while (len>1 && buf[len-2]=='\n') {
        buf[len-2] = buf[len-1];
        buf[len-1] = 0;
        len--;
      }
    }
  
    if (line > 1 || strncmp (buf, "From QUARANTINE", 15))
    {
      if (parseto) {
        if (buf[0] == 0)
          body = 1;
        if (!body && !strncasecmp(buf, "To: ", 4))
          process_parseto(ATX, buf);
      }

      /* remove dot stuffing, if needed */
      /* FIXME: we SHOULD remove dot stuffing, but because i couldn't find a simple way to re-add dot stuffing in the return message. However this currently leads to truncated messages which is very bad.
         As a workaround i disabled the dot-stuffing routing below, resulting in dspam seeing and trarining the extra dots in some messages.
         Edwin Eefting - edwin@datux.nl
         
      if((buf[0] && buf[0]=='.') && (buf[1] && buf[1]=='.')) {
        size_t i, len = strlen(buf);
        for(i=0;i<len;i++){
          buf[i]=buf[i+1];
        }
        buf[len-1]=0;
      }
      */

      if (buffer_cat (message, buf) || buffer_cat(message, "\n"))
      {
        LOG (LOG_CRIT, ERR_MEM_ALLOC);
        goto bail;
      }
    }

    /* Use the original user id if we are reversing a false positive */
    if (ATX->source         == DSS_ERROR      &&
        ATX->classification == DSR_ISINNOCENT &&
        ATX->operating_mode == DSM_PROCESS    &&
        !strncasecmp (buf, "X-DSPAM-User: ", 14))
    {
      char user[MAX_USERNAME_LENGTH];
      strlcpy (user, buf + 14, sizeof (user));
      chomp (user);
      nt_destroy (ATX->users);
      ATX->users = nt_create (NT_CHAR);
      if (ATX->users == NULL)
      {
        LOG(LOG_CRIT, ERR_MEM_ALLOC);
        goto bail;
      }
      nt_add (ATX->users, user);
    }

    free(buf);
    line++;
  }

  return NULL;

bail:
  buffer_destroy(message);
  return NULL;
}

/*
 * daemon_expect(THREAD_CTX *TTX, const char *command) {
 *
 * DESCRIPTION
 *   wait for the right command ot be issued by the client
 *   if any other command is issued, give them an error
 *
 * INPUT ARGUMENTS
 *      TTX        thread context
 *      command    command to wait for
 *
 * RETURN VALUES
 *   pointer to allocated character array containing the input line
 */

char *daemon_expect(THREAD_CTX *TTX, const char *command) {
  char buf[128];
  char *cmd;

  cmd = daemon_getline(TTX, 300);
  if (cmd == NULL)
    return NULL;

  while(strncasecmp(cmd, command, strlen(command))) {
    if (!strncasecmp(cmd, "QUIT", 4)) {
      free(cmd);
      daemon_reply(TTX, LMTP_QUIT, "2.0.0", "OK");
      return NULL;
    } else if (!strncasecmp(cmd, "RSET", 4)) {
      snprintf(buf, sizeof(buf), "%d OK", LMTP_OK);
      if (send_socket(TTX, buf)<=0)
        return NULL;
      free(cmd);
      if (!strncasecmp(command, "LHLO", 4)) {
        cmd = daemon_getline(TTX, 300);
        if (cmd == NULL)
          return NULL;
      } else {
        return "RSET";
      }
    } else {
      snprintf(buf, sizeof(buf), "%d 5.0.0 Need %s here.", LMTP_BAD_CMD, command);
      if (send_socket(TTX, buf)<=0)
        return NULL;
      free(cmd);
      cmd = daemon_getline(TTX, 300);
      if (cmd == NULL)
        return NULL;
    }
  }
  return cmd;
}

/*
 * daemon_reply(THREAD_CTX *TTX, int reply, const char *ecode, const char *text)
 *
 * DESCRIPTION
 *   send a formatted response to the client
 *
 * INPUT ARGUMENTS
 *      TTX      thread context
 *      reply    numeric response code
 *      ecode    enhanced status code
 *      text     info text to send
 *
 * RETURN VALUES
 *    returns 0 on success
 */

int daemon_reply(
  THREAD_CTX *TTX, 
  int reply, 
  const char *ecode, 
  const char *text)
{
  char buf[128];
  snprintf(buf, sizeof(buf), "%d %s%s%s", 
           reply, ecode, (ecode[0]) ? " " : "", text);
  return send_socket(TTX, buf);
}


/*
 * daemon_extension(THREAD_CTX *TTX, const char *extension)
 *
 * DESCRIPTION
 *   advertise a supported LMTP extension
 *
 * INPUT ARGUMENTS
 *       TTX          thread context
 *       extension    extension name
 *
 * RETURN VALUES
 *   returns 0 on success
 */

int daemon_extension(THREAD_CTX *TTX, const char *extension) {
  char buf[128];
  snprintf(buf, sizeof(buf), "%d-%s", LMTP_OK, extension);
  return send_socket(TTX, buf);
}

/*
 * process_signal(int sig)
 *
 *  DESCRIPTION
 *    terminate daemon or perform a reload (signal handler)
 *
 *  INPUT ARGUMENTS
 *      sig    signal code
 *
 */

void process_signal(int sig) {
  __daemon_run = 0;
  if (sig == SIGHUP) {
    LOG(LOG_INFO, INFO_DAEMON_RELOAD);
    __hup = 1;
  } else {
    LOG(LOG_WARNING, ERR_DAEMON_TERMINATE, sig);
    __hup = 0;
  } 

  return;
}

/*
 *  daemon_getline(THREAD_CTX *TTX, int timeout)
 *
 * DESCRIPTION
 *   retrieves a full line of text from a socket
 *
 * INPUT ARGUMENTS
 *      TTX        thread context
 *      timeout    timeout to enforce in waiting for complete line
 *
 * RETURN VALUES
 *   pointer to allocated character array containing line of input
 */

char *daemon_getline(THREAD_CTX *TTX, int timeout) {
  struct timeval tv;
  char *p, *q, *pop;
  char buf[1024];
  int total_wait = 0;
  long recv_len;
  fd_set fds;
  int i;

  pop = pop_buffer(TTX);
  while(!pop && total_wait<timeout) {
    if (__daemon_run == 0) 
      return NULL;
    total_wait++;
    tv.tv_sec = 1;
    tv.tv_usec = 0;
    FD_ZERO(&fds);
    FD_SET(TTX->sockfd, &fds);
    i = select(TTX->sockfd+1, &fds, NULL, NULL, &tv);
    if (i<=0)
      continue;

    recv_len = recv(TTX->sockfd, buf, sizeof(buf)-1, 0);
    buf[recv_len] = 0;
    if (recv_len == 0)
      return NULL;
    for(p=q=buf,i=0;i<recv_len;i++) {
      if (*q) {
        *p = *q;
        p++;
      }
      q++;
    }
    *p = 0;
    buffer_cat(TTX->packet_buffer, buf);
    pop = pop_buffer(TTX);
  }

#ifdef VERBOSE
  LOGDEBUG("SRECV: %s", pop);
#endif

  return pop;
}

/*
 * {increment,decrement}_thread_count
 *
 * DESCRIPTION
 *   keep track of running thread count
 *
 *  in order to reload or terminate, all threads must complete and exit. 
 *  these functions are called whenever a thread spawns or ends and bumps the
 *  thread counter in the appropriate direction
 *
 * RETURN VALUES
 *   pointer to allocated character array containing line of input
 */

void increment_thread_count(void) {
  pthread_mutex_lock(&__lock);
  __num_threads++;
  pthread_mutex_unlock(&__lock);
}

void decrement_thread_count(void) {
  pthread_mutex_lock(&__lock);
  __num_threads--;
  pthread_mutex_unlock(&__lock);
}

#endif