Fix log line corruption for DKIM status

[exim.git] / src / exim_monitor / em_main.c

diff --git a/src/exim_monitor/em_main.c b/src/exim_monitor/em_main.c
index f86494aeb040b9814aaeae425d9cf3f466c16b5b..3034a041ced68139fc26900b38ca2a498880e898 100644 (file)
--- a/src/exim_monitor/em_main.c
+++ b/src/exim_monitor/em_main.c
@@ -1,10 +1,8 @@
-/* $Cambridge: exim/src/exim_monitor/em_main.c,v 1.4 2006/02/07 11:18:59 ph10 Exp $ */
-
 /*************************************************
 *                  Exim Monitor                  *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2016 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -168,7 +166,7 @@ Returns:    nothing
 */
 
 void
-log_write(unsigned int selector, int flags, char *format, ...)
+log_write(unsigned int selector, int flags, const char *format, ...)
 {
 va_list ap;
 va_start(ap, format);
@@ -615,7 +613,6 @@ message_subdir[1] = 0;
 constructing file names and things. This call will initialize
 the store_get() function. */
 
-big_buffer_size = 1024;
 big_buffer = store_get(big_buffer_size);
 
 /* Set up the version string and date and output them */
@@ -645,8 +642,8 @@ stripchart_init();
 only, and we can't tail the log. If not, open the log file and position to the
 end of it. Before doing so, we have to detect whether the log files are
 datestamped, and if so, sort out the name. The string in log_file already has
-%s replaced by "main"; if datestamping is occurring, %D will be present. In
-fact, we don't need to test explicitly - just process the string with
+%s replaced by "main"; if datestamping is occurring, %D or %M will be present.
+In fact, we don't need to test explicitly - just process the string with
 string_format.
 
 Once opened, save the file's inode so that we can detect when the file is
@@ -656,6 +653,8 @@ today.) */
 
 if (log_file[0] != 0)
   {
+  /* Do *not* use "%s" here, we need the %D datestamp in the log_file to
+  be expanded! */
   (void)string_format(log_file_open, sizeof(log_file_open), CS log_file);
   log_datestamping = string_datestamp_offset >= 0;
 
@@ -670,8 +669,14 @@ if (log_file[0] != 0)
     {
     fseek(LOG, 0, SEEK_END);
     log_position = ftell(LOG);
-    fstat(fileno(LOG), &statdata);
-    log_inode = statdata.st_ino;
+    if (fstat(fileno(LOG), &statdata))
+      {
+      perror("log file fstat");
+      fclose(LOG);
+      LOG=NULL;
+      }
+    else
+      log_inode = statdata.st_ino;
     }
   }
 else