attach.c

mutt-1.5.12 源代码。linux 下邮件接受的工具。

/*
 * Copyright (C) 1996-2000 Michael R. Elkins <[e-mail]>
 * Copyright (C) 1999-2000 Thomas Roessler <[e-mail]>
 * 
 *     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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */ 

#if HAVE_CONFIG_H
# include "config.h"
#endif

#include "mutt.h"
#include "mutt_menu.h"
#include "attach.h"
#include "mutt_curses.h"
#include "keymap.h"
#include "rfc1524.h"
#include "mime.h"
#include "pager.h"
#include "mailbox.h"
#include "copy.h"
#include "mx.h"
#include "mutt_crypt.h"

#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>

int mutt_get_tmp_attachment (BODY *a)
{
  char type[STRING];
  char tempfile[_POSIX_PATH_MAX];
  rfc1524_entry *entry = rfc1524_new_entry();
  FILE *fpin = NULL, *fpout = NULL;
  struct stat st;
  
  if(a->unlink)
    return 0;

  snprintf(type, sizeof(type), "%s/%s", TYPE(a), a->subtype);
  rfc1524_mailcap_lookup(a, type, entry, 0);
  rfc1524_expand_filename(entry->nametemplate, a->filename, 
			  tempfile, sizeof(tempfile));
  
  rfc1524_free_entry(&entry);

  if(stat(a->filename, &st) == -1)
    return -1;

  if((fpin = fopen(a->filename, "r")) && (fpout = safe_fopen(tempfile, "w")))  /* __FOPEN_CHECKED__ */
  {
    mutt_copy_stream (fpin, fpout);
    mutt_str_replace (&a->filename, tempfile);
    a->unlink = 1;

    if(a->stamp >= st.st_mtime)
      mutt_stamp_attachment(a);
  }
  else
    mutt_perror(fpin ? tempfile : a->filename);
  
  if(fpin)  fclose(fpin);
  if(fpout) fclose(fpout);
  
  return a->unlink ? 0 : -1;
}


/* return 1 if require full screen redraw, 0 otherwise */
int mutt_compose_attachment (BODY *a)
{
  char type[STRING];
  char command[STRING];
  char newfile[_POSIX_PATH_MAX] = "";
  rfc1524_entry *entry = rfc1524_new_entry ();
  short unlink_newfile = 0;
  int rc = 0;
  
  snprintf (type, sizeof (type), "%s/%s", TYPE (a), a->subtype);
  if (rfc1524_mailcap_lookup (a, type, entry, M_COMPOSE))
  {
    if (entry->composecommand || entry->composetypecommand)
    {

      if (entry->composetypecommand)
	strfcpy (command, entry->composetypecommand, sizeof (command));
      else 
	strfcpy (command, entry->composecommand, sizeof (command));
      if (rfc1524_expand_filename (entry->nametemplate,
				      a->filename, newfile, sizeof (newfile)))
      {
	dprint(1, (debugfile, "oldfile: %s\t newfile: %s\n",
				  a->filename, newfile));
	if (safe_symlink (a->filename, newfile) == -1)
	{
	  if (mutt_yesorno (_("Can't match nametemplate, continue?"), M_YES) != M_YES)
	    goto bailout;
	}
	else
	  unlink_newfile = 1;
      }
      else
	strfcpy(newfile, a->filename, sizeof(newfile));
      
      if (rfc1524_expand_command (a, newfile, type,
				      command, sizeof (command)))
      {
	/* For now, editing requires a file, no piping */
	mutt_error _("Mailcap compose entry requires %%s");
      }
      else
      {
	int r;

	mutt_endwin (NULL);
	if ((r = mutt_system (command)) == -1)
	  mutt_error (_("Error running \"%s\"!"), command);
	
	if (r != -1 && entry->composetypecommand)
	{
	  BODY *b;
	  FILE *fp, *tfp;
	  char tempfile[_POSIX_PATH_MAX];

	  if ((fp = safe_fopen (a->filename, "r")) == NULL)
	  {
	    mutt_perror _("Failure to open file to parse headers.");
	    goto bailout;
	  }

	  b = mutt_read_mime_header (fp, 0);
	  if (b)
	  {
	    if (b->parameter)
	    {
	      mutt_free_parameter (&a->parameter);
	      a->parameter = b->parameter;
	      b->parameter = NULL;
	    }
	    if (b->description) {
	      FREE (&a->description);
	      a->description = b->description;
	      b->description = NULL;
	    }
	    if (b->form_name)
	    {
	      FREE (&a->form_name);
	      a->form_name = b->form_name;
	      b->form_name = NULL;
	    }

	    /* Remove headers by copying out data to another file, then 
	     * copying the file back */
	    fseeko (fp, b->offset, 0);
	    mutt_mktemp (tempfile);
	    if ((tfp = safe_fopen (tempfile, "w")) == NULL)
	    {
	      mutt_perror _("Failure to open file to strip headers.");
	      goto bailout;
	    }
	    mutt_copy_stream (fp, tfp);
	    fclose (fp);
	    fclose (tfp);
	    mutt_unlink (a->filename);  
	    if (mutt_rename_file (tempfile, a->filename) != 0) 
	    {
	      mutt_perror _("Failure to rename file.");
	      goto bailout;
	    }

	    mutt_free_body (&b);
	  }
	}
      }
    }
  }
  else
  {
    rfc1524_free_entry (&entry);
    mutt_message (_("No mailcap compose entry for %s, creating empty file."),
		   type);
    return 1;
  }

  rc = 1;
  
  bailout:
  
  if(unlink_newfile)
    unlink(newfile);

  rfc1524_free_entry (&entry);
  return rc;
}

/* 
 * Currently, this only works for send mode, as it assumes that the 
 * BODY->filename actually contains the information.  I'm not sure
 * we want to deal with editing attachments we've already received,
 * so this should be ok.
 *
 * Returns 1 if editor found, 0 if not (useful to tell calling menu to
 * redraw)
 */
int mutt_edit_attachment (BODY *a)
{
  char type[STRING];
  char command[STRING];
  char newfile[_POSIX_PATH_MAX] = "";
  rfc1524_entry *entry = rfc1524_new_entry ();
  short unlink_newfile = 0;
  int rc = 0;
  
  snprintf (type, sizeof (type), "%s/%s", TYPE (a), a->subtype);
  if (rfc1524_mailcap_lookup (a, type, entry, M_EDIT))
  {
    if (entry->editcommand)
    {

      strfcpy (command, entry->editcommand, sizeof (command));
      if (rfc1524_expand_filename (entry->nametemplate,
				      a->filename, newfile, sizeof (newfile)))
      {
	dprint(1, (debugfile, "oldfile: %s\t newfile: %s\n",
				  a->filename, newfile));
	if (safe_symlink (a->filename, newfile) == -1)
	{
	  if (mutt_yesorno (_("Can't match nametemplate, continue?"), M_YES) != M_YES)
	    goto bailout;
	}
	else
	  unlink_newfile = 1;
      }
      else
	strfcpy(newfile, a->filename, sizeof(newfile));

      if (rfc1524_expand_command (a, newfile, type,
				      command, sizeof (command)))
      {
	/* For now, editing requires a file, no piping */
	mutt_error _("Mailcap Edit entry requires %%s");
        goto bailout;
      }
      else
      {
	mutt_endwin (NULL);
	if (mutt_system (command) == -1)
        {
	  mutt_error (_("Error running \"%s\"!"), command);
          goto bailout;
        }
      }
    }
  }
  else if (a->type == TYPETEXT)
  {
    /* On text, default to editor */
    mutt_edit_file (NONULL (Editor), a->filename);
  }
  else
  {
    rfc1524_free_entry (&entry);
    mutt_error (_("No mailcap edit entry for %s"),type);
    return 0;
  }

  rc = 1;
  
  bailout:
  
  if(unlink_newfile)
    unlink(newfile);
  
  rfc1524_free_entry (&entry);
  return rc;
}


/* for compatibility with metamail */
static int is_mmnoask (const char *buf)
{
  char tmp[LONG_STRING], *p, *q;
  int lng;

  if ((p = getenv ("MM_NOASK")) != NULL && *p)
  {
    if (mutt_strcmp (p, "1") == 0)
      return (1);

    strfcpy (tmp, p, sizeof (tmp));
    p = tmp;

    while ((p = strtok (p, ",")) != NULL)
    {
      if ((q = strrchr (p, '/')) != NULL)
      {
	if (*(q+1) == '*')
	{
	  if (ascii_strncasecmp (buf, p, q-p) == 0)
	    return (1);
	}
	else
	{
	  if (ascii_strcasecmp (buf, p) == 0)
	    return (1);
	}
      }
      else
      {
	lng = mutt_strlen (p);
	if (buf[lng] == '/' && mutt_strncasecmp (buf, p, lng) == 0)
	  return (1);
      }

      p = NULL;
    }
  }

  return (0);
}

void mutt_check_lookup_list (BODY *b, char *type, int len)
{
  LIST *t = MimeLookupList;
  int i;

  for (; t; t = t->next) {
    i = mutt_strlen (t->data) - 1;
    if ((i > 0 && t->data[i-1] == '/' && t->data[i] == '*' && 
	 ascii_strncasecmp (type, t->data, i) == 0) ||
	ascii_strcasecmp (type, t->data) == 0) {

    BODY tmp = {0};
    int n;
    if ((n = mutt_lookup_mime_type (&tmp, b->filename)) != TYPEOTHER) {
      snprintf (type, len, "%s/%s",
                n == TYPEAUDIO ? "audio" :
                n == TYPEAPPLICATION ? "application" :
                n == TYPEIMAGE ? "image" :
                n == TYPEMESSAGE ? "message" :
                n == TYPEMODEL ? "model" :
                n == TYPEMULTIPART ? "multipart" :
                n == TYPETEXT ? "text" :
                n == TYPEVIDEO ? "video" : "other",
                tmp.subtype);
      dprint(1, (debugfile, "mutt_check_lookup_list: \"%s\" -> %s\n", 
        b->filename, type));
    }
    if (tmp.subtype) 
      FREE (&tmp.subtype);
    if (tmp.xtype) 
      FREE (&tmp.xtype);
    }
  }
}

int mutt_is_autoview (BODY *b, const char *type)
{
  LIST *t = AutoViewList;
  char _type[SHORT_STRING];
  int i;

  if (!type)
    snprintf (_type, sizeof (_type), "%s/%s", TYPE (b), b->subtype);
  else
    strncpy (_type, type, sizeof(_type));

  mutt_check_lookup_list (b, _type, sizeof(_type));
  type = _type;

  if (mutt_needs_mailcap (b))
  {
    if (option (OPTIMPLICITAUTOVIEW))
      return 1;
    
    if (is_mmnoask (type))
      return 1;
  }

  for (; t; t = t->next) {
    i = mutt_strlen (t->data) - 1;
    if ((i > 0 && t->data[i-1] == '/' && t->data[i] == '*' && 
	 ascii_strncasecmp (type, t->data, i) == 0) ||
	ascii_strcasecmp (type, t->data) == 0)
      return 1;
  }

  return 0;
}

/* returns -1 on error, 0 or the return code from mutt_do_pager() on success */
int mutt_view_attachment (FILE *fp, BODY *a, int flag, HEADER *hdr,
			  ATTACHPTR **idx, short idxlen)
{
  char tempfile[_POSIX_PATH_MAX] = "";
  char pagerfile[_POSIX_PATH_MAX] = "";
  int is_message;
  int use_mailcap;
  int use_pipe = 0;
  int use_pager = 1;
  char type[STRING];
  char command[STRING];
  char descrip[STRING];
  char *fname;
  rfc1524_entry *entry = NULL;
  int rc = -1;
  int unlink_tempfile = 0;
  
  is_message = mutt_is_message_type(a->type, a->subtype);
  if (WithCrypto && is_message && a->hdr && (a->hdr->security & ENCRYPT) &&
      !crypt_valid_passphrase(a->hdr->security))
    return (rc);
  use_mailcap = (flag == M_MAILCAP ||
		(flag == M_REGULAR && mutt_needs_mailcap (a)));
  snprintf (type, sizeof (type), "%s/%s", TYPE (a), a->subtype);
  
  if (use_mailcap)
  {
    entry = rfc1524_new_entry (); 
    if (!rfc1524_mailcap_lookup (a, type, entry, 0))
    {
      if (flag == M_REGULAR)
      {
	/* fallback to view as text */
	rfc1524_free_entry (&entry);
	mutt_error _("No matching mailcap entry found.  Viewing as text.");
	flag = M_AS_TEXT;
	use_mailcap = 0;
      }
      else
	goto return_error;
    }
  }
  
  if (use_mailcap)
  {
    if (!entry->command)
    {
      mutt_error _("MIME type not defined.  Cannot view attachment.");
      goto return_error;
    }
    strfcpy (command, entry->command, sizeof (command));
    
    if (fp)
    {
      fname = safe_strdup (a->filename);
      mutt_sanitize_filename (fname, 1);
    }
    else
      fname = a->filename;

    if (rfc1524_expand_filename (entry->nametemplate, fname,
				 tempfile, sizeof (tempfile)))
    {
      if (fp == NULL && mutt_strcmp(tempfile, a->filename))
      {
	/* send case: the file is already there */
	if (safe_symlink (a->filename, tempfile) == -1)
	{
	  if (mutt_yesorno (_("Can't match nametemplate, continue?"), M_YES) == M_YES)
	    strfcpy (tempfile, a->filename, sizeof (tempfile));
	  else
	    goto return_error;
	}
	else
	  unlink_tempfile = 1;
      }
    }
    else if (fp == NULL) /* send case */
      strfcpy (tempfile, a->filename, sizeof (tempfile));
    
    if (fp)
    {
      /* recv case: we need to save the attachment to a file */
      FREE (&fname);
      if (mutt_save_attachment (fp, a, tempfile, 0, NULL) == -1)
	goto return_error;
    }

    use_pipe = rfc1524_expand_command (a, tempfile, type,
				       command, sizeof (command));
    use_pager = entry->copiousoutput;
  }
  
  if (use_pager)
  {
    if (fp && !use_mailcap && a->filename)
    {
      /* recv case */
      strfcpy (pagerfile, a->filename, sizeof (pagerfile));
      mutt_adv_mktemp (pagerfile, sizeof(pagerfile));
    }
    else
      mutt_mktemp (pagerfile);
  }
    
  if (use_mailcap)
  {
    pid_t thepid = 0;
    int tempfd = -1, pagerfd = -1;
    
    if (!use_pager)
      mutt_endwin (NULL);

    if (use_pager || use_pipe)
    {
      if (use_pager && ((pagerfd = safe_open (pagerfile, O_CREAT | O_EXCL | O_WRONLY)) == -1))
      {
	mutt_perror ("open");
	goto return_error;
      }
      if (use_pipe && ((tempfd = open (tempfile, 0)) == -1))
      {
	if(pagerfd != -1)
	  close(pagerfd);
	mutt_perror ("open");
	goto return_error;
      }

      if ((thepid = mutt_create_filter_fd (command, NULL, NULL, NULL,
					   use_pipe ? tempfd : -1, use_pager ? pagerfd : -1, -1)) == -1)
      {
	if(pagerfd != -1)
	  close(pagerfd);
	
	if(tempfd != -1)