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System: rn version 4.3
Patch #: 1
Priority: MEDIUM
Subject: backpage can confuse header parser resulting in bad reply address
From: pmontgom@sdcrdcf.UUCP (Peter Montgomery)

Description:
	If you use the 'b' backpage command to get back to the first page
	of an article, the article header is reparsed wrong, and references
	to %T, %t, %[relay-version], %[posting-version], %[path], and %[from]
	will be incorrect.

Repeat-By:
	Go to an article more than one page long.  Go forward one page, then
	use 'b' to back up.  Then type 'r' to mail a reply.  The address
	passed to Rnmail will consist of all the lines from relay-version to
	from, which needless to say will confuse any mailer ever written.

Fix:	First of all, check to see if there is a "patchlevel" file in your
	rn source directory.  If so, it probably indicates that some of
	the patches have already been applied.

	If there is no patchlevel file, then in order to start recording
	revision levels for the entire rn kit, cd to the rn source
	directory and give the command:

	echo "Patch #: 0" >patchlevel

	If this is done correctly, patch will automatically update the
	patchlevel file to reflect the maximum applied patch number.
	(See the first patch below.)

	From rn, say "| patch -d DIR", where DIR is your rn source directory.
	Outside of rn, say "cd DIR; patch <thisarticle".  If you don't have
	the patch program, apply the following by hand, or get patch.

	Warning: this patch is not reversed.  If the patch program says
	it is, then this patch has already been applied, and you should
	not apply it again.

	If patch indicates that patchlevel is the wrong version the patch has
	already been applied.  See the patchlevel file to find out what
	has been applied.  Don't continue with the patch.

Index: patchlevel
Prereq: 0
1c1
< Patch #: 0
---
> Patch #: 1

Index: art.c
Prereq: 4.3
*** art.c.old	Fri May 10 13:52:54 1985
--- art.c	Fri May 10 13:52:59 1985
***************
*** 1,4
! /* $Header: art.c,v 4.3 85/05/01 11:34:51 lwall Exp $
   *
   * $Log:	art.c,v $
   * Revision 4.3  85/05/01  11:34:51  lwall

--- 1,4 -----
! /* $Header: art.c,v 4.3.1.2 85/05/10 13:46:07 lwall Exp $
   *
   * $Log:	art.c,v $
   * Revision 4.3.1.2  85/05/10  13:46:07  lwall
***************
*** 1,6
  /* $Header: art.c,v 4.3 85/05/01 11:34:51 lwall Exp $
   *
   * $Log:	art.c,v $
   * Revision 4.3  85/05/01  11:34:51  lwall
   * Baseline for release with 4.3bsd.
   * 

--- 1,12 -----
  /* $Header: art.c,v 4.3.1.2 85/05/10 13:46:07 lwall Exp $
   *
   * $Log:	art.c,v $
+  * Revision 4.3.1.2  85/05/10  13:46:07  lwall
+  * Fixed header reparse bug on backpage.
+  * 
+  * Revision 4.3.1.1  85/05/10  11:30:56  lwall
+  * Branch for patches.
+  * 
   * Revision 4.3  85/05/01  11:34:51  lwall
   * Baseline for release with 4.3bsd.
   * 
***************
*** 104,109
  	    artpos = vrdary(artline);
  	    if (artpos < 0)
  		artpos = -artpos;	/* labs(), anyone? */
  	    fseek(artfp,artpos,0);
  	    if (artpos < htype[PAST_HEADER].ht_minpos)
  		in_header = SOME_LINE;

--- 110,117 -----
  	    artpos = vrdary(artline);
  	    if (artpos < 0)
  		artpos = -artpos;	/* labs(), anyone? */
+ 	    if (firstpage)
+ 		artpos = (ART_POS)0;
  	    fseek(artfp,artpos,0);
  	    if (artpos < htype[PAST_HEADER].ht_minpos)
  		in_header = SOME_LINE;

Index: head.c
Prereq: 4.3
*** head.c.old	Fri May 10 13:52:36 1985
--- head.c	Fri May 10 13:52:39 1985
***************
*** 1,4
! /* $Header: head.c,v 4.3 85/05/01 11:38:21 lwall Exp $
   *
   * $Log:	head.c,v $
   * Revision 4.3  85/05/01  11:38:21  lwall

--- 1,4 -----
! /* $Header: head.c,v 4.3.1.2 85/05/10 13:47:25 lwall Exp $
   *
   * $Log:	head.c,v $
   * Revision 4.3.1.2  85/05/10  13:47:25  lwall
***************
*** 1,6
  /* $Header: head.c,v 4.3 85/05/01 11:38:21 lwall Exp $
   *
   * $Log:	head.c,v $
   * Revision 4.3  85/05/01  11:38:21  lwall
   * Baseline for release with 4.3bsd.
   * 

--- 1,12 -----
  /* $Header: head.c,v 4.3.1.2 85/05/10 13:47:25 lwall Exp $
   *
   * $Log:	head.c,v $
+  * Revision 4.3.1.2  85/05/10  13:47:25  lwall
+  * Added debugging stuff.
+  * 
+  * Revision 4.3.1.1  85/05/10  11:32:30  lwall
+  * Branch for patches.
+  * 
   * Revision 4.3  85/05/01  11:38:21  lwall
   * Baseline for release with 4.3bsd.
   * 
***************
*** 28,33
  	htypeix[*htype[i].ht_name - 'a'] = i;
  }
  
  int
  set_line_type(bufptr,colon)
  char *bufptr;

--- 34,56 -----
  	htypeix[*htype[i].ht_name - 'a'] = i;
  }
  
+ #ifdef DEBUGGING
+ dumpheader(where)
+ char *where;
+ {
+     register int i;
+ 
+     printf("header: %d %s", parsed_art, where);
+ 
+     for (i=0; i<HEAD_LAST; i++) {
+ 	printf("%15s %4d %4d %03o\n",htype[i].ht_name,
+ 	    htype[i].ht_minpos,
+ 	    htype[i].ht_maxpos,
+ 	    htype[i].ht_flags) FLUSH;
+     }
+ }
+ #endif
+ 
  int
  set_line_type(bufptr,colon)
  char *bufptr;
***************
*** 68,73
  {
      register int i;
  
      for (i=0; i<HEAD_LAST; i++) {
  	htype[i].ht_minpos = -1;
  	htype[i].ht_maxpos = 0;

--- 91,100 -----
  {
      register int i;
  
+ #ifdef DEBUGGING
+     if (debug & 4)
+ 	dumpheader("start_header\n");
+ #endif
      for (i=0; i<HEAD_LAST; i++) {
  	htype[i].ht_minpos = -1;
  	htype[i].ht_maxpos = 0;
***************
*** 108,113
  	    first_one = (htype[in_header].ht_minpos < 0);
  	    if (first_one)
  		htype[in_header].ht_minpos = artpos;
  	    if (htype[in_header].ht_flags & HT_HIDE)
  		return newhide;
  	}

--- 135,144 -----
  	    first_one = (htype[in_header].ht_minpos < 0);
  	    if (first_one)
  		htype[in_header].ht_minpos = artpos;
+ #ifdef DEBUGGING
+ 	    if (debug & 4)
+ 		dumpheader(art_buf);
+ #endif
  	    if (htype[in_header].ht_flags & HT_HIDE)
  		return newhide;
  	}
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