Adding upstream version 4.94.2.upstream/4.94.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 246 insertions, 0 deletions

diff --git a/src/spool_mbox.c b/src/spool_mbox.c
new file mode 100644
index 0000000..4f3c4d2
--- /dev/null
+++ b/src/spool_mbox.c
@@ -0,0 +1,246 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015
+ * License: GPL
+ * Copyright (c) The Exim Maintainers 2016 - 2020
+ */
+
+/* Code for setting up a MBOX style spool file inside a /scan/<msgid>
+sub directory of exim's spool directory. */
+
+#include "exim.h"
+#ifdef WITH_CONTENT_SCAN
+
+extern int malware_ok;
+extern int spam_ok;
+
+int spool_mbox_ok = 0;
+uschar spooled_message_id[MESSAGE_ID_LENGTH+1];
+
+/*
+Create an MBOX-style message file from the spooled files.
+
+Returns a pointer to the FILE, and puts the size in bytes into mbox_file_size.
+If mbox_fname is non-null, fill in a pointer to the name.
+Normally, source_file_override is NULL
+*/
+
+FILE *
+spool_mbox(unsigned long *mbox_file_size, const uschar *source_file_override,
+  uschar ** mbox_fname)
+{
+uschar message_subdir[2];
+uschar buffer[16384];
+uschar *temp_string;
+uschar *mbox_path;
+FILE *mbox_file = NULL, *l_data_file = NULL, *yield = NULL;
+struct stat statbuf;
+int j;
+rmark reset_point;
+
+mbox_path = string_sprintf("%s/scan/%s/%s.eml",
+  spool_directory, message_id, message_id);
+if (mbox_fname) *mbox_fname = mbox_path;
+
+reset_point = store_mark();
+
+/* Skip creation if already spooled out as mbox file */
+if (!spool_mbox_ok)
+  {
+  /* create temp directory inside scan dir, directory_make works recursively */
+  temp_string = string_sprintf("scan/%s", message_id);
+  if (!directory_make(spool_directory, temp_string, 0750, FALSE))
+    {
+    log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno,
+      "scan directory %s/scan/%s", spool_directory, temp_string));
+    goto OUT;
+    }
+
+  /* open [message_id].eml file for writing */
+
+  if (!(mbox_file = modefopen(mbox_path, "wb", SPOOL_MODE)))
+    {
+    log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno,
+      "scan file %s", mbox_path));
+    goto OUT;
+    }
+
+  /* Generate mailbox headers. The $received_for variable is (up to at least
+  Exim 4.64) never set here, because it is only set when expanding the
+  contents of the Received: header line. However, the code below will use it
+  if it should become available in future. */
+
+  temp_string = expand_string(
+    US"From ${if def:return_path{$return_path}{MAILER-DAEMON}} ${tod_bsdinbox}\n"
+    "${if def:sender_address{X-Envelope-From: <${sender_address}>\n}}"
+    "${if def:recipients{X-Envelope-To: ${recipients}\n}}");
+
+  if (temp_string)
+    if (fwrite(temp_string, Ustrlen(temp_string), 1, mbox_file) != 1)
+      {
+      log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \
+	  mailbox headers to %s", mbox_path);
+      goto OUT;
+      }
+
+  /* write all non-deleted header lines to mbox file */
+
+  for (header_line * my_headerlist = header_list; my_headerlist;
+      my_headerlist = my_headerlist->next)
+    if (my_headerlist->type != '*')
+      if (fwrite(my_headerlist->text, my_headerlist->slen, 1, mbox_file) != 1)
+	{
+	log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \
+	    message headers to %s", mbox_path);
+	goto OUT;
+	}
+
+  /* End headers */
+  if (fwrite("\n", 1, 1, mbox_file) != 1)
+    {
+    log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \
+      message headers to %s", mbox_path);
+    goto OUT;
+    }
+
+  /* Copy body file.  If the main receive still has it open then it is holding
+  a lock, and we must not close it (which releases the lock), so just use the
+  global file handle. */
+  if (source_file_override)
+    l_data_file = Ufopen(source_file_override, "rb");
+  else if (spool_data_file)
+    l_data_file = spool_data_file;
+  else
+    {
+    message_subdir[1] = '\0';
+    for (int i = 0; i < 2; i++)
+      {
+      set_subdir_str(message_subdir, message_id, i);
+      temp_string = spool_fname(US"input", message_subdir, message_id, US"-D");
+      if ((l_data_file = Ufopen(temp_string, "rb"))) break;
+      }
+    }
+
+  if (!l_data_file)
+    {
+    log_write(0, LOG_MAIN|LOG_PANIC, "Could not open datafile for message %s",
+      message_id);
+    goto OUT;
+    }
+
+  /* The code used to use this line, but it doesn't work in Cygwin.
+
+      (void)fread(data_buffer, 1, 18, l_data_file);
+
+     What's happening is that spool_mbox used to use an fread to jump over the
+     file header. That fails under Cygwin because the header is locked, but
+     doing an fseek succeeds. We have to output the leading newline
+     explicitly, because the one in the file is parted of the locked area.  */
+
+  if (!source_file_override)
+    (void)fseek(l_data_file, SPOOL_DATA_START_OFFSET, SEEK_SET);
+
+  do
+    {
+    uschar * s;
+
+    if (!f.spool_file_wireformat || source_file_override)
+      j = fread(buffer, 1, sizeof(buffer), l_data_file);
+    else						/* needs CRLF -> NL */
+      if ((s = US fgets(CS buffer, sizeof(buffer), l_data_file)))
+	{
+	uschar * p = s + Ustrlen(s) - 1;
+
+	if (*p == '\n' && p[-1] == '\r')
+	  *--p = '\n';
+	else if (*p == '\r')
+	  ungetc(*p--, l_data_file);
+
+	j = p - buffer;
+	}
+      else
+	j = 0;
+
+    if (j > 0)
+      if (fwrite(buffer, j, 1, mbox_file) != 1)
+        {
+	log_write(0, LOG_MAIN|LOG_PANIC, "Error/short write while writing \
+	    message body to %s", mbox_path);
+	goto OUT;
+	}
+    } while (j > 0);
+
+  (void)fclose(mbox_file);
+  mbox_file = NULL;
+
+  Ustrncpy(spooled_message_id, message_id, sizeof(spooled_message_id));
+  spooled_message_id[sizeof(spooled_message_id)-1] = '\0';
+  spool_mbox_ok = 1;
+  }
+
+/* get the size of the mbox message and open [message_id].eml file for reading*/
+
+if (  !(yield = Ufopen(mbox_path,"rb"))
+   || fstat(fileno(yield), &statbuf) != 0
+   )
+  log_write(0, LOG_MAIN|LOG_PANIC, "%s", string_open_failed(errno,
+    "scan file %s", mbox_path));
+else
+  *mbox_file_size = statbuf.st_size;
+
+OUT:
+if (l_data_file && !spool_data_file) (void)fclose(l_data_file);
+if (mbox_file) (void)fclose(mbox_file);
+store_reset(reset_point);
+return yield;
+}
+
+
+
+
+
+/* remove mbox spool file and temp directory */
+void
+unspool_mbox(void)
+{
+spam_ok = 0;
+malware_ok = 0;
+
+if (spool_mbox_ok && !f.no_mbox_unspool)
+  {
+  uschar *file_path;
+  DIR *tempdir;
+  rmark reset_point = store_mark();
+  uschar * mbox_path = string_sprintf("%s/scan/%s", spool_directory, spooled_message_id);
+
+  if (!(tempdir = exim_opendir(mbox_path)))
+    {
+    debug_printf("Unable to opendir(%s): %s\n", mbox_path, strerror(errno));
+    /* Just in case we still can: */
+    rmdir(CS mbox_path);
+    return;
+    }
+  /* loop thru dir & delete entries */
+  for (struct dirent *entry; entry = readdir(tempdir); )
+    {
+    uschar *name = US entry->d_name;
+    int dummy;
+    if (Ustrcmp(name, US".") == 0 || Ustrcmp(name, US"..") == 0) continue;
+
+    file_path = string_sprintf("%s/%s", mbox_path, name);
+    debug_printf("unspool_mbox(): unlinking '%s'\n", file_path);
+    dummy = unlink(CS file_path); dummy = dummy;	/* compiler quietening */
+    }
+
+  closedir(tempdir);
+
+  /* remove directory */
+  rmdir(CS mbox_path);
+  store_reset(reset_point);
+  }
+spool_mbox_ok = 0;
+}
+
+#endif