[exim-cvs] cvs commit: exim/exim-doc/doc-txt ChangeLog NewSt…

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Autor: Phil Pennock
Datum:  
To: exim-cvs
Betreff: [exim-cvs] cvs commit: exim/exim-doc/doc-txt ChangeLog NewStuff exim/exim-src/src acl.c exim.c functions.h log.c macros.h
pdp 2010/06/06 01:27:52 BST

  Modified files:
    exim-doc/doc-txt     ChangeLog NewStuff 
    exim-src/src         acl.c exim.c functions.h log.c macros.h 
  Log:
  Implement "control = debug" ACL control.  Fixes: #937


  Revision  Changes    Path
  1.623     +3 -0      exim/exim-doc/doc-txt/ChangeLog
  1.170     +12 -0     exim/exim-doc/doc-txt/NewStuff
  1.88      +28 -0     exim/exim-src/src/acl.c
  1.67      +3 -152    exim/exim-src/src/exim.c
  1.51      +3 -0      exim/exim-src/src/functions.h
  1.15      +237 -9    exim/exim-src/src/log.c
  1.40      +3 -0      exim/exim-src/src/macros.h


  Index: ChangeLog
  ===================================================================
  RCS file: /home/cvs/exim/exim-doc/doc-txt/ChangeLog,v
  retrieving revision 1.622
  retrieving revision 1.623
  diff -u -r1.622 -r1.623
  --- ChangeLog    5 Jun 2010 23:50:18 -0000    1.622
  +++ ChangeLog    6 Jun 2010 00:27:52 -0000    1.623
  @@ -1,9 +1,10 @@
  -$Cambridge: exim/exim-doc/doc-txt/ChangeLog,v 1.622 2010/06/05 23:50:18 pdp Exp $
  +$Cambridge: exim/exim-doc/doc-txt/ChangeLog,v 1.623 2010/06/06 00:27:52 pdp Exp $


Change log file for Exim from version 4.21
-------------------------------------------

Exim version 4.73
+-----------------

   PP/01 Date: & Message-Id: revert to normally being appended to a message,
         only prepend for the Resent-* case.  Fixes regression introduced in
  @@ -33,6 +34,8 @@


PP/09 Implemented reverse_ip expansion operator.

+PP/10 Bugzilla 937: provide a "debug" ACL control.
+

Exim version 4.72
-----------------

  Index: NewStuff
  ===================================================================
  RCS file: /home/cvs/exim/exim-doc/doc-txt/NewStuff,v
  retrieving revision 1.169
  retrieving revision 1.170
  diff -u -r1.169 -r1.170
  --- NewStuff    5 Jun 2010 23:50:18 -0000    1.169
  +++ NewStuff    6 Jun 2010 00:27:52 -0000    1.170
  @@ -1,4 +1,4 @@
  -$Cambridge: exim/exim-doc/doc-txt/NewStuff,v 1.169 2010/06/05 23:50:18 pdp Exp $
  +$Cambridge: exim/exim-doc/doc-txt/NewStuff,v 1.170 2010/06/06 00:27:52 pdp Exp $


   New Features in Exim
   --------------------
  @@ -51,6 +51,18 @@
         ${reverse_ip:2001:0db8:c42:9:1:abcd:192.0.2.3}
          -> 3.0.2.0.0.0.0.c.d.c.b.a.1.0.0.0.9.0.0.0.2.4.c.0.8.b.d.0.1.0.0.2


  + 6. There is a new ACL control called "debug", to enable debug logging.
  +    This allows selective logging of certain incoming transactions within
  +    production environments, with some care.  It takes two options, "tag"
  +    and "opts"; "tag" is included in the filename of the log and "opts"
  +    is used as per the -d<options> command-line option.  Examples, which
  +    don't all make sense in all contexts:
  +
  +      control = debug
  +      control = debug/tag=.$sender_host_address
  +      control = debug/opts=+expand+acl
  +      control = debug/tag=.$message_exim_id/opts=+expand
  +


Version 4.72
------------

  Index: acl.c
  ===================================================================
  RCS file: /home/cvs/exim/exim-src/src/acl.c,v
  retrieving revision 1.87
  retrieving revision 1.88
  diff -u -r1.87 -r1.88
  --- acl.c    16 Nov 2009 19:50:36 -0000    1.87
  +++ acl.c    6 Jun 2010 00:27:52 -0000    1.88
  @@ -1,4 +1,4 @@
  -/* $Cambridge: exim/exim-src/src/acl.c,v 1.87 2009/11/16 19:50:36 nm4 Exp $ */
  +/* $Cambridge: exim/exim-src/src/acl.c,v 1.88 2010/06/06 00:27:52 pdp Exp $ */


   /*************************************************
   *     Exim - an Internet mail transport agent    *
  @@ -171,6 +171,7 @@
     #ifdef EXPERIMENTAL_BRIGHTMAIL
     CONTROL_BMI_RUN,
     #endif
  +  CONTROL_DEBUG,
     #ifndef DISABLE_DKIM
     CONTROL_DKIM_VERIFY,
     #endif
  @@ -204,6 +205,7 @@
     #ifdef EXPERIMENTAL_BRIGHTMAIL
     US"bmi_run",
     #endif
  +  US"debug",
     #ifndef DISABLE_DKIM
     US"dkim_disable_verify",
     #endif
  @@ -517,6 +519,8 @@
     0,                                               /* bmi_run */
     #endif


  +  0,                                               /* debug */
  +
     #ifndef DISABLE_DKIM
     (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)|      /* dkim_disable_verify */
       (1<<ACL_WHERE_NOTSMTP_START),
  @@ -598,6 +602,7 @@
   #ifdef EXPERIMENTAL_BRIGHTMAIL
     { US"bmi_run",                 CONTROL_BMI_RUN, FALSE },
   #endif
  +  { US"debug",                   CONTROL_DEBUG, TRUE },
   #ifndef DISABLE_DKIM
     { US"dkim_disable_verify",     CONTROL_DKIM_VERIFY, FALSE },
   #endif
  @@ -2416,6 +2421,8 @@
   {
   uschar *user_message = NULL;
   uschar *log_message = NULL;
  +uschar *debug_tag = NULL;
  +uschar *debug_opts = NULL;
   uschar *p = NULL;
   int rc = OK;
   #ifdef WITH_CONTENT_SCAN
  @@ -2703,6 +2710,27 @@
           }
         break;


  +      case CONTROL_DEBUG:
  +      while (*p == '/')
  +        {
  +        if (Ustrncmp(p, "/tag=", 5) == 0)
  +          {
  +          uschar *pp = p + 5;
  +          while (*pp != '\0' && *pp != '/') pp++;
  +          debug_tag = string_copyn(p+5, pp-p-5);
  +          p = pp;
  +          }
  +        else if (Ustrncmp(p, "/opts=", 6) == 0)
  +          {
  +          uschar *pp = p + 6;
  +          while (*pp != '\0' && *pp != '/') pp++;
  +          debug_opts = string_copyn(p+6, pp-p-6);
  +          p = pp;
  +          }
  +        }
  +        debug_logging_activate(debug_tag, debug_opts);
  +      break;
  +
         case CONTROL_SUPPRESS_LOCAL_FIXUPS:
         suppress_local_fixups = TRUE;
         break;


  Index: exim.c
  ===================================================================
  RCS file: /home/cvs/exim/exim-src/src/exim.c,v
  retrieving revision 1.66
  retrieving revision 1.67
  diff -u -r1.66 -r1.67
  --- exim.c    5 Jun 2010 11:13:29 -0000    1.66
  +++ exim.c    6 Jun 2010 00:27:52 -0000    1.67
  @@ -1,4 +1,4 @@
  -/* $Cambridge: exim/exim-src/src/exim.c,v 1.66 2010/06/05 11:13:29 pdp Exp $ */
  +/* $Cambridge: exim/exim-src/src/exim.c,v 1.67 2010/06/06 00:27:52 pdp Exp $ */


   /*************************************************
   *     Exim - an Internet mail transport agent    *
  @@ -682,155 +682,6 @@



   /*************************************************
  -*         Decode bit settings for log/debug      *
  -*************************************************/
  -
  -/* This function decodes a string containing bit settings in the form of +name
  -and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
  -also recognizes a numeric setting of the form =<number>, but this is not
  -intended for user use. It's an easy way for Exim to pass the debug settings
  -when it is re-exec'ed.
  -
  -The log options are held in two unsigned ints (because there became too many
  -for one). The top bit in the table means "put in 2nd selector". This does not
  -yet apply to debug options, so the "=" facility sets only the first selector.
  -
  -The "all" selector, which must be equal to 0xffffffff, is recognized specially.
  -It sets all the bits in both selectors. However, there is a facility for then
  -unsetting certain bits, because we want to turn off "memory" in the debug case.
  -
  -A bad value for a debug setting is treated as an unknown option - error message
  -to stderr and die. For log settings, which come from the configuration file,
  -we write to the log on the way out...
  -
  -Arguments:
  -  selector1      address of the first bit string
  -  selector2      address of the second bit string, or NULL
  -  notall1        bits to exclude from "all" for selector1
  -  notall2        bits to exclude from "all" for selector2
  -  string         the configured string
  -  options        the table of option names
  -  count          size of table
  -  which          "log" or "debug"
  -
  -Returns:         nothing on success - bomb out on failure
  -*/
  -
  -static void
  -decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
  -  int notall2, uschar *string, bit_table *options, int count, uschar *which)
  -{
  -uschar *errmsg;
  -if (string == NULL) return;
  -
  -if (*string == '=')
  -  {
  -  char *end;    /* Not uschar */
  -  *selector1 = strtoul(CS string+1, &end, 0);
  -  if (*end == 0) return;
  -  errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
  -    string);
  -  goto ERROR_RETURN;
  -  }
  -
  -/* Handle symbolic setting */
  -
  -else for(;;)
  -  {
  -  BOOL adding;
  -  uschar *s;
  -  int len;
  -  bit_table *start, *end;
  -
  -  while (isspace(*string)) string++;
  -  if (*string == 0) return;
  -
  -  if (*string != '+' && *string != '-')
  -    {
  -    errmsg = string_sprintf("malformed %s_selector setting: "
  -      "+ or - expected but found \"%s\"", which, string);
  -    goto ERROR_RETURN;
  -    }
  -
  -  adding = *string++ == '+';
  -  s = string;
  -  while (isalnum(*string) || *string == '_') string++;
  -  len = string - s;
  -
  -  start = options;
  -  end = options + count;
  -
  -  while (start < end)
  -    {
  -    bit_table *middle = start + (end - start)/2;
  -    int c = Ustrncmp(s, middle->name, len);
  -    if (c == 0)
  -      {
  -      if (middle->name[len] != 0) c = -1; else
  -        {
  -        unsigned int bit = middle->bit;
  -        unsigned int *selector;
  -
  -        /* The value with all bits set means "force all bits in both selectors"
  -        in the case where two are being handled. However, the top bit in the
  -        second selector is never set. When setting, some bits can be excluded.
  -        */
  -
  -        if (bit == 0xffffffff)
  -          {
  -          if (adding)
  -            {
  -            *selector1 = 0xffffffff ^ notall1;
  -            if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
  -            }
  -          else
  -            {
  -            *selector1 = 0;
  -            if (selector2 != NULL) *selector2 = 0;
  -            }
  -          }
  -
  -        /* Otherwise, the 0x80000000 bit means "this value, without the top
  -        bit, belongs in the second selector". */
  -
  -        else
  -          {
  -          if ((bit & 0x80000000) != 0)
  -            {
  -            selector = selector2;
  -            bit &= 0x7fffffff;
  -            }
  -          else selector = selector1;
  -          if (adding) *selector |= bit; else *selector &= ~bit;
  -          }
  -        break;  /* Out of loop to match selector name */
  -        }
  -      }
  -    if (c < 0) end = middle; else start = middle + 1;
  -    }  /* Loop to match selector name */
  -
  -  if (start >= end)
  -    {
  -    errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
  -      adding? '+' : '-', len, s);
  -    goto ERROR_RETURN;
  -    }
  -  }    /* Loop for selector names */
  -
  -/* Handle disasters */
  -
  -ERROR_RETURN:
  -if (Ustrcmp(which, "debug") == 0)
  -  {
  -  fprintf(stderr, "exim: %s\n", errmsg);
  -  exit(EXIT_FAILURE);
  -  }
  -else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
  -}
  -
  -
  -
  -/*************************************************
   *          Show supported features               *
   *************************************************/


  @@ -2080,7 +1931,7 @@
           }
         if (*argrest != 0)
           decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
  -          debug_options_count, US"debug");
  +          debug_options_count, US"debug", 0);
         debug_selector = selector;
         }
       break;
  @@ -3249,8 +3100,8 @@


/* Handle the decoding of logging options. */

-decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
- log_options, log_options_count, US"log");
+decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
+ log_selector_string, log_options, log_options_count, US"log", 0);

   DEBUG(D_any)
     {


  Index: functions.h
  ===================================================================
  RCS file: /home/cvs/exim/exim-src/src/functions.h,v
  retrieving revision 1.50
  retrieving revision 1.51
  diff -u -r1.50 -r1.51
  --- functions.h    5 Jun 2010 23:50:18 -0000    1.50
  +++ functions.h    6 Jun 2010 00:27:52 -0000    1.51
  @@ -1,4 +1,4 @@
  -/* $Cambridge: exim/exim-src/src/functions.h,v 1.50 2010/06/05 23:50:18 pdp Exp $ */
  +/* $Cambridge: exim/exim-src/src/functions.h,v 1.51 2010/06/06 00:27:52 pdp Exp $ */


   /*************************************************
   *     Exim - an Internet mail transport agent    *
  @@ -72,11 +72,14 @@
   extern int     dcc_process(uschar **);
   #endif


  +extern void    debug_logging_activate(uschar *, uschar *);
   extern void    debug_print_argv(uschar **);
   extern void    debug_print_ids(uschar *);
   extern void    debug_print_string(uschar *);
   extern void    debug_print_tree(tree_node *);
   extern void    debug_vprintf(char *, va_list);
  +extern void    decode_bits(unsigned int *, unsigned int *,
  +                  int, int, uschar *, bit_table *, int, uschar *, int);
   extern address_item *deliver_make_addr(uschar *, BOOL);
   extern int     deliver_message(uschar *, BOOL, BOOL);
   extern void    deliver_msglog(const char *, ...);


  Index: log.c
  ===================================================================
  RCS file: /home/cvs/exim/exim-src/src/log.c,v
  retrieving revision 1.14
  retrieving revision 1.15
  diff -u -r1.14 -r1.15
  --- log.c    16 Nov 2009 19:50:37 -0000    1.14
  +++ log.c    6 Jun 2010 00:27:52 -0000    1.15
  @@ -1,4 +1,4 @@
  -/* $Cambridge: exim/exim-src/src/log.c,v 1.14 2009/11/16 19:50:37 nm4 Exp $ */
  +/* $Cambridge: exim/exim-src/src/log.c,v 1.15 2010/06/06 00:27:52 pdp Exp $ */


   /*************************************************
   *     Exim - an Internet mail transport agent    *
  @@ -19,9 +19,9 @@
   #define LOG_MODE_FILE   1
   #define LOG_MODE_SYSLOG 2


-enum { lt_main, lt_reject, lt_panic, lt_process };
+enum { lt_main, lt_reject, lt_panic, lt_debug, lt_process };

-static uschar *log_names[] = { US"main", US"reject", US"panic", US"process" };
+static uschar *log_names[] = { US"main", US"reject", US"panic", US"debug", US"process" };



@@ -31,6 +31,7 @@

static uschar mainlog_name[LOG_NAME_SIZE];
static uschar rejectlog_name[LOG_NAME_SIZE];
+static uschar debuglog_name[LOG_NAME_SIZE];

static uschar *mainlog_datestamp = NULL;
static uschar *rejectlog_datestamp = NULL;
@@ -226,16 +227,17 @@

   Arguments:
     fd         where to return the resulting file descriptor
  -  type       lt_main, lt_reject, lt_panic, or lt_process
  +  type       lt_main, lt_reject, lt_panic, lt_debug or lt_process
  +  tag        optional tag to include in the name (only hooked up for debug)


Returns: nothing
*/

static void
-open_log(int *fd, int type)
+open_log(int *fd, int type, uschar *tag)
{
uid_t euid;
-BOOL ok;
+BOOL ok, ok2;
uschar buffer[LOG_NAME_SIZE];

   /* Sort out the file name. This depends on the type of log we are opening. The
  @@ -282,6 +284,22 @@
       rejectlog_datestamp = rejectlog_name + string_datestamp_offset;
       }


  +  /* and deal with the debug log (which keeps the datestamp, but does not
  +  update it) */
  +
  +  else if (type == lt_debug)
  +    {
  +    Ustrcpy(debuglog_name, buffer);
  +    if (tag)
  +      {
  +      /* this won't change the offset of the datestamp */
  +      ok2 = string_format(buffer, sizeof(buffer), "%s%s",
  +          debuglog_name, tag);
  +      if (ok2)
  +        Ustrcpy(debuglog_name, buffer);
  +      }
  +    }
  +
     /* Remove any datestamp if this is the panic log. This is rare, so there's no
     need to optimize getting the datestamp length. We remove one non-alphanumeric
     char afterwards if at the start, otherwise one before. */
  @@ -860,7 +878,7 @@


       if (mainlogfd < 0)
         {
  -      open_log(&mainlogfd, lt_main);     /* No return on error */
  +      open_log(&mainlogfd, lt_main, NULL);     /* No return on error */
         if (fstat(mainlogfd, &statbuf) >= 0) mainlog_inode = statbuf.st_ino;
         }


@@ -984,7 +1002,7 @@

       if (rejectlogfd < 0)
         {
  -      open_log(&rejectlogfd, lt_reject); /* No return on error */
  +      open_log(&rejectlogfd, lt_reject, NULL); /* No return on error */
         if (fstat(rejectlogfd, &statbuf) >= 0) rejectlog_inode = statbuf.st_ino;
         }


  @@ -1005,7 +1023,7 @@
   if ((flags & LOG_PROCESS) != 0)
     {
     int processlogfd;
  -  open_log(&processlogfd, lt_process);  /* No return on error */
  +  open_log(&processlogfd, lt_process, NULL);  /* No return on error */
     if ((rc = write(processlogfd, log_buffer, length)) != length)
       {
       log_write_failed(US"process log", length, rc);
  @@ -1036,7 +1054,7 @@
     if ((logging_mode & LOG_MODE_FILE) != 0)
       {
       panic_recurseflag = TRUE;
  -    open_log(&paniclogfd, lt_panic);  /* Won't return on failure */
  +    open_log(&paniclogfd, lt_panic, NULL);  /* Won't return on failure */
       panic_recurseflag = FALSE;


       if (panic_save_buffer != NULL)
  @@ -1079,4 +1097,214 @@
   syslog_open = FALSE;
   }


  +
  +
  +/*************************************************
  +*         Decode bit settings for log/debug      *
  +*************************************************/
  +
  +/* This function decodes a string containing bit settings in the form of +name
  +and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
  +also recognizes a numeric setting of the form =<number>, but this is not
  +intended for user use. It's an easy way for Exim to pass the debug settings
  +when it is re-exec'ed.
  +
  +The log options are held in two unsigned ints (because there became too many
  +for one). The top bit in the table means "put in 2nd selector". This does not
  +yet apply to debug options, so the "=" facility sets only the first selector.
  +
  +The "all" selector, which must be equal to 0xffffffff, is recognized specially.
  +It sets all the bits in both selectors. However, there is a facility for then
  +unsetting certain bits, because we want to turn off "memory" in the debug case.
  +
  +The action taken for bad values varies depending upon why we're here.
  +For log messages, or if the debugging is triggered from config, then we write
  +to the log on the way out.  For debug setting triggered from the command-line,
  +we treat it as an unknown option: error message to stderr and die.
  +
  +Arguments:
  +  selector1      address of the first bit string
  +  selector2      address of the second bit string, or NULL
  +  notall1        bits to exclude from "all" for selector1
  +  notall2        bits to exclude from "all" for selector2
  +  string         the configured string
  +  options        the table of option names
  +  count          size of table
  +  which          "log" or "debug"
  +  flags          DEBUG_FROM_CONFIG
  +
  +Returns:         nothing on success - bomb out on failure
  +*/
  +
  +void
  +decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
  +  int notall2, uschar *string, bit_table *options, int count, uschar *which,
  +  int flags)
  +{
  +uschar *errmsg;
  +if (string == NULL) return;
  +
  +if (*string == '=')
  +  {
  +  char *end;    /* Not uschar */
  +  *selector1 = strtoul(CS string+1, &end, 0);
  +  if (*end == 0) return;
  +  errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
  +    string);
  +  goto ERROR_RETURN;
  +  }
  +
  +/* Handle symbolic setting */
  +
  +else for(;;)
  +  {
  +  BOOL adding;
  +  uschar *s;
  +  int len;
  +  bit_table *start, *end;
  +
  +  while (isspace(*string)) string++;
  +  if (*string == 0) return;
  +
  +  if (*string != '+' && *string != '-')
  +    {
  +    errmsg = string_sprintf("malformed %s_selector setting: "
  +      "+ or - expected but found \"%s\"", which, string);
  +    goto ERROR_RETURN;
  +    }
  +
  +  adding = *string++ == '+';
  +  s = string;
  +  while (isalnum(*string) || *string == '_') string++;
  +  len = string - s;
  +
  +  start = options;
  +  end = options + count;
  +
  +  while (start < end)
  +    {
  +    bit_table *middle = start + (end - start)/2;
  +    int c = Ustrncmp(s, middle->name, len);
  +    if (c == 0)
  +      {
  +      if (middle->name[len] != 0) c = -1; else
  +        {
  +        unsigned int bit = middle->bit;
  +        unsigned int *selector;
  +
  +        /* The value with all bits set means "force all bits in both selectors"
  +        in the case where two are being handled. However, the top bit in the
  +        second selector is never set. When setting, some bits can be excluded.
  +        */
  +
  +        if (bit == 0xffffffff)
  +          {
  +          if (adding)
  +            {
  +            *selector1 = 0xffffffff ^ notall1;
  +            if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
  +            }
  +          else
  +            {
  +            *selector1 = 0;
  +            if (selector2 != NULL) *selector2 = 0;
  +            }
  +          }
  +
  +        /* Otherwise, the 0x80000000 bit means "this value, without the top
  +        bit, belongs in the second selector". */
  +
  +        else
  +          {
  +          if ((bit & 0x80000000) != 0)
  +            {
  +            selector = selector2;
  +            bit &= 0x7fffffff;
  +            }
  +          else selector = selector1;
  +          if (adding) *selector |= bit; else *selector &= ~bit;
  +          }
  +        break;  /* Out of loop to match selector name */
  +        }
  +      }
  +    if (c < 0) end = middle; else start = middle + 1;
  +    }  /* Loop to match selector name */
  +
  +  if (start >= end)
  +    {
  +    errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
  +      adding? '+' : '-', len, s);
  +    goto ERROR_RETURN;
  +    }
  +  }    /* Loop for selector names */
  +
  +/* Handle disasters */
  +
  +ERROR_RETURN:
  +if (Ustrcmp(which, "debug") == 0)
  +  {
  +  if (flags & DEBUG_FROM_CONFIG)
  +    {
  +    log_write(0, LOG_CONFIG|LOG_PANIC, "%s", errmsg);
  +    return;
  +    }
  +  fprintf(stderr, "exim: %s\n", errmsg);
  +  exit(EXIT_FAILURE);
  +  }
  +else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
  +}
  +
  +
  +
  +/*************************************************
  +*        Activate a debug logfile (late)         *
  +*************************************************/
  +
  +/* Normally, debugging is activated from the command-line; it may be useful
  +within the configuration to activate debugging later, based on certain
  +conditions.  If debugging is already in progress, we return early, no action
  +taken (besides debug-logging that we wanted debug-logging).
  +
  +Failures in options are not fatal but will result in paniclog entries for the
  +misconfiguration.
  +
  +The first use of this is in ACL logic, "control = debug/tag=foo/opts=+expand"
  +which can be combined with conditions, etc, to activate extra logging only
  +for certain sources. */
  +
  +void
  +debug_logging_activate(uschar *tag_name, uschar *opts)
  +{
  +int fd = -1;
  +
  +if (debug_file)
  +  {
  +  debug_printf("DEBUGGING ACTIVATED FROM WITHIN CONFIG.\n"
  +      "DEBUG: Tag=\"%s\" Opts=\"%s\"\n", tag_name, opts);
  +  return;
  +  }
  +
  +if (tag_name != NULL && (Ustrchr(tag_name, '/') != NULL))
  +  {
  +  log_write(0, LOG_MAIN|LOG_PANIC, "debug tag may not contain a '/' in: %s",
  +      tag_name);
  +  return;
  +  }
  +
  +debug_selector = D_default;
  +if (opts)
  +  {
  +  decode_bits(&debug_selector, NULL, D_memory, 0, opts,
  +      debug_options, debug_options_count, US"debug", DEBUG_FROM_CONFIG);
  +  }
  +
  +open_log(&fd, lt_debug, tag_name);
  +
  +if (fd != -1)
  +  debug_file = fdopen(fd, "w");
  +else
  +  log_write(0, LOG_MAIN|LOG_PANIC, "unable to open debug log");
  +}
  +
  +
   /* End of log.c */


  Index: macros.h
  ===================================================================
  RCS file: /home/cvs/exim/exim-src/src/macros.h,v
  retrieving revision 1.39
  retrieving revision 1.40
  diff -u -r1.39 -r1.40
  --- macros.h    16 Nov 2009 19:50:37 -0000    1.39
  +++ macros.h    6 Jun 2010 00:27:52 -0000    1.40
  @@ -1,4 +1,4 @@
  -/* $Cambridge: exim/exim-src/src/macros.h,v 1.39 2009/11/16 19:50:37 nm4 Exp $ */
  +/* $Cambridge: exim/exim-src/src/macros.h,v 1.40 2010/06/06 00:27:52 pdp Exp $ */


   /*************************************************
   *     Exim - an Internet mail transport agent    *
  @@ -707,6 +707,9 @@
   #define LOG_CONFIG_FOR  (256+128) /* Add " for" instead of ":\n" */
   #define LOG_CONFIG_IN   (512+128) /* Add " in line x[ of file y]" */


  +/* and for debug_bits() logging action control: */
  +#define DEBUG_FROM_CONFIG       0x0001
  +
   /* SMTP command identifiers for the smtp_connection_had field that records the
   most recent SMTP commands. Must be kept in step with the list of names in
   smtp_in.c that is used for creating the smtp_no_mail logging action. SCH_NONE