community/thttpd: fix serving of .gz and .Z files

thttpd erroneously treats these files as a compressed transfer
encoding rather than as a content type. this causes conforming http
clients to strip the compression and save a decompressed version when
downloading. since this was historically a common httpd bug, some web
browsers work around the problem by detecting the .gz extension and
ignoring the server's reported transfer encoding, but others,
including wget 1.19.2, save a decompressed file, breaking file
integrity checking (based on a hash or signature of the original
compressed file) and breaking scripts which pass the -z option to tar
when extracting.

add a patch which removes thttpd's support for extension-based content
transfer encodings, and adds the missing mime types for gzip and
compress. the patch has been written to be minimally invasive to the
program logic, and thus leaves a for loop that breaks on the first
iteration rather than rewriting it.

1 files changed, 169 insertions, 0 deletions

diff --git a/community/thttpd/remove_transfer_encoding.patch b/community/thttpd/remove_transfer_encoding.patch
new file mode 100644
index 0000000000..86df66cd0d
--- /dev/null
+++ b/community/thttpd/remove_transfer_encoding.patch
@@ -0,0 +1,169 @@
+diff --git a/Makefile.in b/Makefile.in
+index ded71e0..f9a6bc1 100644
+--- a/Makefile.in
++++ b/Makefile.in
+@@ -68,7 +68,7 @@ OBJ =		$(SRC:.c=.o) @LIBOBJS@
+ 
+ ALL =		thttpd
+ 
+-GENHDR =	mime_encodings.h mime_types.h
++GENHDR =	mime_types.h
+ 
+ CLEANFILES =	$(ALL) $(OBJ) $(GENSRC) $(GENHDR)
+ 
+@@ -81,12 +81,6 @@ thttpd: $(OBJ)
+ 	@rm -f $@
+ 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJ) $(LIBS) $(NETLIBS)
+ 
+-mime_encodings.h:	mime_encodings.txt
+-	rm -f mime_encodings.h
+-	sed < mime_encodings.txt > mime_encodings.h \
+-	  -e 's/#.*//' -e 's/[ 	]*$$//' -e '/^$$/d' \
+-	  -e 's/[ 	][ 	]*/", 0, "/' -e 's/^/{ "/' -e 's/$$/", 0 },/'
+-
+ mime_types.h:	mime_types.txt
+ 	rm -f mime_types.h
+ 	sed < mime_types.txt > mime_types.h \
+@@ -157,14 +151,14 @@ tar:
+ 	  rm -rf $$name ; \
+ 	  mkdir $$name ; \
+ 	  tar cf - `cat FILES` | ( cd $$name ; tar xfBp - ) ; \
+-	  chmod 644 $$name/Makefile.in $$name/config.h $$name/mime_encodings.txt $$name/mime_types.txt ; \
++	  chmod 644 $$name/Makefile.in $$name/config.h $$name/mime_types.txt ; \
+ 	  chmod 755 $$name/cgi-bin $$name/cgi-src $$name/contrib $$name/contrib/redhat-rpm $$name/extras $$name/scripts ; \
+ 	  tar cf $$name.tar $$name ; \
+ 	  rm -rf $$name ; \
+ 	  gzip $$name.tar
+ 
+ thttpd.o:	config.h version.h libhttpd.h fdwatch.h mmc.h timers.h match.h
+-libhttpd.o:	config.h version.h libhttpd.h mime_encodings.h mime_types.h \
++libhttpd.o:	config.h version.h libhttpd.h mime_types.h \
+ 		mmc.h timers.h match.h tdate_parse.h
+ fdwatch.o:	fdwatch.h
+ mmc.o:		mmc.h libhttpd.h
+diff --git a/libhttpd.c b/libhttpd.c
+index 3814e6a..bbb4e14 100644
+--- a/libhttpd.c
++++ b/libhttpd.c
+@@ -2506,10 +2506,6 @@ struct mime_entry {
+     char* val;
+     size_t val_len;
+     };
+-static struct mime_entry enc_tab[] = {
+-#include "mime_encodings.h"
+-    };
+-static const int n_enc_tab = sizeof(enc_tab) / sizeof(*enc_tab);
+ static struct mime_entry typ_tab[] = {
+ #include "mime_types.h"
+     };
+@@ -2533,15 +2529,9 @@ init_mime( void )
+     int i;
+ 
+     /* Sort the tables so we can do binary search. */
+-    qsort( enc_tab, n_enc_tab, sizeof(*enc_tab), ext_compare );
+     qsort( typ_tab, n_typ_tab, sizeof(*typ_tab), ext_compare );
+ 
+     /* Fill in the lengths. */
+-    for ( i = 0; i < n_enc_tab; ++i )
+-	{
+-	enc_tab[i].ext_len = strlen( enc_tab[i].ext );
+-	enc_tab[i].val_len = strlen( enc_tab[i].val );
+-	}
+     for ( i = 0; i < n_typ_tab; ++i )
+ 	{
+ 	typ_tab[i].ext_len = strlen( typ_tab[i].ext );
+@@ -2561,14 +2551,12 @@ figure_mime( httpd_conn* hc )
+     char* prev_dot;
+     char* dot;
+     char* ext;
+-    int me_indexes[100], n_me_indexes;
+-    size_t ext_len, encodings_len;
++    size_t ext_len;
+     int i, top, bot, mid;
+     int r;
+     char* default_type = "text/plain; charset=%s";
+ 
+     /* Peel off encoding extensions until there aren't any more. */
+-    n_me_indexes = 0;
+     for ( prev_dot = &hc->expnfilename[strlen(hc->expnfilename)]; ; prev_dot = dot )
+ 	{
+ 	for ( dot = prev_dot - 1; dot >= hc->expnfilename && *dot != '.'; --dot )
+@@ -2583,25 +2571,7 @@ figure_mime( httpd_conn* hc )
+ 	    }
+ 	ext = dot + 1;
+ 	ext_len = prev_dot - ext;
+-	/* Search the encodings table.  Linear search is fine here, there
+-	** are only a few entries.
+-	*/
+-	for ( i = 0; i < n_enc_tab; ++i )
+-	    {
+-	    if ( ext_len == enc_tab[i].ext_len && strncasecmp( ext, enc_tab[i].ext, ext_len ) == 0 )
+-		{
+-		if ( n_me_indexes < sizeof(me_indexes)/sizeof(*me_indexes) )
+-		    {
+-		    me_indexes[n_me_indexes] = i;
+-		    ++n_me_indexes;
+-		    }
+-		goto next;
+-		}
+-	    }
+-	/* No encoding extension found.  Break and look for a type extension. */
+ 	break;
+-
+-	next: ;
+ 	}
+ 
+     /* Binary search for a matching type extension. */
+@@ -2632,20 +2602,6 @@ figure_mime( httpd_conn* hc )
+ 
+     /* The last thing we do is actually generate the mime-encoding header. */
+     hc->encodings[0] = '\0';
+-    encodings_len = 0;
+-    for ( i = n_me_indexes - 1; i >= 0; --i )
+-	{
+-	httpd_realloc_str(
+-	    &hc->encodings, &hc->maxencodings,
+-	    encodings_len + enc_tab[me_indexes[i]].val_len + 1 );
+-	if ( hc->encodings[0] != '\0' )
+-	    {
+-	    (void) strcpy( &hc->encodings[encodings_len], "," );
+-	    ++encodings_len;
+-	    }
+-	(void) strcpy( &hc->encodings[encodings_len], enc_tab[me_indexes[i]].val );
+-	encodings_len += enc_tab[me_indexes[i]].val_len;
+-	}
+ 
+     }
+ 
+diff --git a/mime_encodings.txt b/mime_encodings.txt
+deleted file mode 100644
+index 2d3952d..0000000
+--- a/mime_encodings.txt
++++ /dev/null
+@@ -1,8 +0,0 @@
+-# mime_encodings.txt
+-#
+-# A list of file extensions followed by the corresponding MIME encoding.
+-# Extensions not found in the table proceed to the mime_types table.
+-
+-Z	compress
+-gz	gzip
+-uu	x-uuencode
+diff --git a/mime_types.txt b/mime_types.txt
+index d4725d9..3d7ccbd 100644
+--- a/mime_types.txt
++++ b/mime_types.txt
+@@ -50,6 +50,7 @@ fh7	image/x-freehand
+ fhc	image/x-freehand
+ gif	image/gif
+ gtar	application/x-gtar
++gz	application/gzip
+ hdf	application/x-hdf
+ hqx	application/mac-binhex40
+ htm	text/html; charset=%s
+@@ -195,4 +196,5 @@ xpm	image/x-xpixmap
+ xsl	text/xml; charset=%s
+ xwd	image/x-xwindowdump
+ xyz	chemical/x-xyz
++Z	application/x-compress
+ zip	application/zip