From 40dbee86f3043aff8a8c2055521e270318e33068 Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@g10code.com>
Date: Tue, 24 Nov 2015 18:39:30 +0100
Subject: tools: Add encryption and decryption support to gpgtar.

* tools/Makefile.am: Amend CFLAGS and LDADD.
* tools/gpgtar-create.c (gpgtar_create): Add encrypt flag and encrypt
stream if requested.
* tools/gpgtar-extract.c (gpgtar_extract): Likewise for decryption.
* tools/gpgtar-list.c (gpgtar_list): Likewise.
* tools/gpgtar.c (main): Initialize npth and assuan.  Parse recipient
and local user, and note which flags are currently ignored.  Adapt
calls to gpgtar_list and friends.
(tar_and_encrypt): Drop stub function and prototype.
(decrypt_and_untar): Likewise.
(decrypt_and_list): Likewise.
* tools/gpgtar.h (gpgtar_{create,extract,list}): Add encryption or
decryption argument.

Signed-off-by: Justus Winter <justus@g10code.com>
---
 tools/gpgtar-list.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'tools/gpgtar-list.c')

diff --git a/tools/gpgtar-list.c b/tools/gpgtar-list.c
index d525d24d7..41e08dbe1 100644
--- a/tools/gpgtar-list.c
+++ b/tools/gpgtar-list.c
@@ -26,6 +26,7 @@
 
 #include "i18n.h"
 #include "gpgtar.h"
+#include "../common/call-gpg.h"
 
 
 
@@ -267,10 +268,11 @@ print_header (tar_header_t header, estream_t out)
 /* List the tarball FILENAME or, if FILENAME is NULL, the tarball read
    from stdin.  */
 void
-gpgtar_list (const char *filename)
+gpgtar_list (const char *filename, int decrypt)
 {
   gpg_error_t err;
   estream_t stream;
+  estream_t cipher_stream = NULL;
   tar_header_t header;
 
   if (filename)
@@ -292,6 +294,24 @@ gpgtar_list (const char *filename)
   if (stream == es_stdin)
     es_set_binary (es_stdin);
 
+  if (decrypt)
+    {
+      cipher_stream = stream;
+      stream = es_fopenmem (0, "rwb");
+      if (! stream)
+        {
+          err = gpg_error_from_syserror ();
+          goto leave;
+        }
+      err = gpg_decrypt_stream (NULL, NULL, cipher_stream, stream);
+      if (err)
+        goto leave;
+
+      err = es_fseek (stream, 0, SEEK_SET);
+      if (err)
+        goto leave;
+    }
+
   for (;;)
     {
       header = read_header (stream);
@@ -311,6 +331,8 @@ gpgtar_list (const char *filename)
   xfree (header);
   if (stream != es_stdin)
     es_fclose (stream);
+  if (stream != cipher_stream)
+    es_fclose (cipher_stream);
   return;
 }
 
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