/* -*- C -*- 
   mboxgrep - scan mailbox for messages matching a regular expression
   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2006  Daniel Spiljar
   
   Mboxgrep 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.
   
   Mboxgrep 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 mboxgrep; if not, write to the Free Software Foundation, 
   Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   
   $Id: scan.c,v 1.32 2006-10-22 23:34:49 dspiljar Exp $ */

#include <config.h>

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif /* HAVE_SYS_NDIR_H */
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif /* HAVE_SYS_DIR_H */
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif /* HAVE_NDIR_H */
#endif /* HAVE_DIRENT_H */

#include <time.h>
#include <errno.h>
#include <string.h>
#define BUFLEN 16384

#include "mboxgrep.h"
#include "scan.h"
#include "mbox.h"
#include "mh.h"
#include "maildir.h"
#include "wrap.h"
#include "md5.h"
#include "misc.h"
#include "re.h"
#ifdef HAVE_FTS_OPEN
# include <sys/stat.h>
# include <fts.h>
#else
# ifdef HAVE_FTW
#  include <ftw.h>
# endif /* HAVE_FTW */
#endif /* HAVE_FTS_OPEN */

#ifdef HAVE_LIBDMALLOC
#include <dmalloc.h>
#endif /* HAVE_LIBDMALLOC */

void scan_mailbox (char path[])
     /* {{{  */
{
  static FILE *outf;
  static mbox_t *mbox, *out;
  static DIR *boxd, *foo;
  static maildir_t *maildird;
  static message_t *msg;
  int delete = 0;
  int isdup = 0;

  if (config.format == MAILDIR && config.action == WRITE)
    {
      foo = opendir (config.outboxname); /* do NOT change this to m_opendir! */
      if (foo == NULL && errno == ENOENT)
	maildir_create (config.outboxname);
      else closedir (foo);

      if (-1 == maildir_check (config.outboxname))
	{
	  if (config.merr)
	    fprintf (stderr, "%s: %s: Not a maildir folder\n", APPNAME, 
		     config.outboxname);
	  exit (2);
	}
    }

  runtime.count = 0;
  if (config.action == DELETE)
    delete = 1;

  if ((config.format == MBOX) || (config.format == ZMBOX) ||
      (config.format == BZ2MBOX))
    {
      mbox = (mbox_t *) mbox_open (path, "r");
      if (mbox == NULL) return;
    }
  else if ((config.format == MH) || (config.format == NNMH) ||
	   (config.format == NNML))
    {
      boxd = mh_open (path);
      if (boxd == NULL) return;
    }
  else if (config.format == MAILDIR)
    {
      maildird = maildir_open (path);
      if (maildird == NULL) return;
    }

  for (;;)
    {
      config.res1 = 1;
      config.res2 = 1;

      if ((config.format == MBOX) || (config.format == ZMBOX) ||
	  (config.format == BZ2MBOX))
	msg = (message_t *) mbox_read_message (mbox);
      else if ((config.format == MH) || (config.format == NNMH) ||
	       (config.format == NNML))
	msg = (message_t *) mh_read_message (boxd);
      else if (config.format == MAILDIR)
	msg = (message_t *) maildir_read_message (maildird);

      if (msg == NULL) break;

      if (msg->from == NULL) msg->from = (char *) xstrdup ("nobody");

#ifdef HAVE_LIBPCRE
      if (config.perl)
	pcre_match (msg);
      else
#endif /* HAVE_LIBPCRE */
	regex_match (msg);

      if (config.dedup)
	isdup = md5_check_message (msg->body, runtime.cs);

      if (((config.res1 == 0) | (config.res2 == 0)) ^
	  ((config.invert ^ delete)) &&
	  ((config.dedup && !isdup) || !config.dedup))
	{
	  if (config.action == DISPLAY)
	    {
	      if (config.format != MBOX && config.format != ZMBOX
		  && config.format != BZ2MBOX
		  && 0 != strncmp ("From ", msg->headers, 5))
		postmark_print (msg);
	      fprintf (stdout, "%s\n%s", msg->headers, msg->body);
	    }
	  else if (config.action == WRITE)
	    {
	      if (config.format == MAILDIR)
		maildir_write_message (msg, config.outboxname);
	      else if (config.format == MH || config.format == NNMH ||
		       config.format == NNML)
		mh_write_message (msg, config.outboxname);
	      else if ((config.format == MBOX) || (config.format == ZMBOX) ||
		       (config.format == BZ2MBOX))
		{
		  out = mbox_open (config.outboxname, "w");
		  /* fprintf (out->fp, "%s\n%s", msg->headers, msg->body); */
		  mbox_write_message (msg, out);
		  mbox_close (out);
		}
	    }
	  else if (config.action == PIPE)
	    {
	      outf = popen (config.pipecmd, "w");
	      if (outf == NULL)
		{
		  if (config.merr)
		    {
		      fprintf (stderr, "%s: %s: ", APPNAME, config.pipecmd);
		      perror (NULL);
		    }
		  exit (2);
		} /* if */
	      fprintf (outf, "%s\n%s", msg->headers, msg->body);
	      pclose (outf);
	    }
	  else if (config.action == COUNT)
	    runtime.count++;
	  else if (config.action == DELETE &&
		   ((config.format == MBOX) || (config.format == ZMBOX) ||
		    (config.format == BZ2MBOX)))
	    mbox_write_message (msg, runtime.tmp_mbox);
	}

      else if (((((config.res1 == 0) | (config.res2 == 0)) ^
		 config.invert) && delete) &&
	       ((config.format == MH) || (config.format == NNMH) || 
		(config.format == NNML) || (config.format == MAILDIR)))
	m_unlink(msg->filename);

      free(msg->body);
      free(msg->headers);
      free(msg);
    } /* for */
  if ((config.format == MBOX) || (config.format == ZMBOX) ||
      (config.format == BZ2MBOX))
    mbox_close (mbox);
  else if ((config.format == MH) || (config.format == NNMH) ||
	   (config.format == NNML))
    mh_close(boxd);
}
/* }}} */

void recursive_scan (char path[])
     /* {{{  */

{
#ifdef HAVE_FTS_OPEN
  FTS *ftsfoo;
  FTSENT *ftsbar;
#endif /* HAVE_FTS_OPEN */

#ifdef HAVE_FTS_OPEN
  {
    char *p[2];

    p[0] = strdup (path);
    p[1] = 0;

    ftsfoo = fts_open (p, FTS_NOCHDIR, NULL);

    if (ftsfoo == NULL)
      {
	/* fixme (?) */
	perror(APPNAME);
	exit (2);
      }

    while ((ftsbar = fts_read (ftsfoo)))
      scan_mailbox (ftsbar->fts_path);

    fts_close (ftsfoo);
  }
#else
  ftw (path, (void *) scan_mailbox, 1);
#endif /* HAVE_FTS_OPEN */
}

/* }}} */

int md5_check_message (char *body, checksum_t *chksum)
     /* {{{  */
{
  struct md5_ctx a;
  char b[16];
  int i;

  md5_init_ctx (&a);
  if (body == NULL)
    md5_process_bytes ("", 0, &a);
  else
    md5_process_bytes (body, strlen(body), &a);
  md5_finish_ctx(&a, b);

  for (i = 0; i < chksum->n; i++)
    {
      if (0 == strncmp ((char *)chksum->md5[i], b, 16)) 
	return 1; 
    }

  chksum->md5 = 
	(char **) xrealloc (chksum->md5, (1 + chksum->n) * sizeof (char *));
  chksum->md5[chksum->n] = xstrdup (b);

  (chksum->n)++;

  return 0;
}
/* }}} */