From 69e7805f54e6bcb665668b4c61e3da344c53278a Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Thu, 2 Nov 2000 19:24:48 +0000
Subject: [PATCH] 'openssl engine' can now list engine capabilities.  The
 current implementation is contained in the application, and the capability
 string building part should really be part of the engine library. This is
 therefore an experimental hack, and will be changed in the near future.

---
 CHANGES       |  3 ++
 apps/engine.c | 77 +++++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 66 insertions(+), 14 deletions(-)

diff --git a/CHANGES b/CHANGES
index 6d83cfa2ee..a91bfaeef1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,9 @@
 
  Changes between 0.9.6 and 0.9.7  [xx XXX 2000]
 
+  *) 'openssl engine' can now list capabilities.
+     [Richard Levitte]
+
   *) Better error reporting in 'openssl engine'.
      [Richard Levitte]
 
diff --git a/apps/engine.c b/apps/engine.c
index a66696152f..8abe04e808 100644
--- a/apps/engine.c
+++ b/apps/engine.c
@@ -85,6 +85,38 @@ static void identity(void *ptr)
 	return;
 	}
 
+static int append_buf(char **buf, char *s, int *size, int step)
+	{
+	int l = strlen(s);
+
+	if (*buf == NULL)
+		{
+		*size = step;
+		*buf = OPENSSL_malloc(*size);
+		if (*buf == NULL)
+			return 0;
+		**buf = '\0';
+		}
+
+	if (**buf != '\0')
+		l += 2;		/* ", " */
+
+	if (strlen(*buf) + strlen(s) >= *size)
+		{
+		*size += step;
+		*buf = OPENSSL_realloc(*buf, *size);
+		}
+
+	if (*buf == NULL)
+		return 0;
+
+	if (**buf != '\0')
+		strcat(*buf, ", ");
+	strcat(*buf, s);
+
+	return 1;
+	}
+
 int MAIN(int, char **);
 
 int MAIN(int argc, char **argv)
@@ -117,16 +149,7 @@ int MAIN(int argc, char **argv)
 		if (strcmp(*argv,"-v") == 0)
 			verbose=1;
 		else if (strcmp(*argv,"-c") == 0)
-			{
 			list_cap=1;
-
-			/* When list_cap is implemented. remove the following
-			 * 3 lines.
-			 */
-			BIO_printf(bio_err, "-c not yet supported\n");
-			badops=1;
-			break;
-			}
 		else if (strcmp(*argv,"-t") == 0)
 			test_avail=1;
 		else if ((strncmp(*argv,"-h",2) == 0) ||
@@ -166,20 +189,47 @@ int MAIN(int argc, char **argv)
 			const char *name = ENGINE_get_name(e);
 			BIO_printf(bio_out, "%s (%s)", name, id);
 			if (list_cap || test_avail)
-				BIO_printf(bio_out, ": ");
+				BIO_printf(bio_out, ":");
 			if (test_avail)
 				{
 				if (ENGINE_init(e))
 					{
-					BIO_printf(bio_out, "available");
+					BIO_printf(bio_out, " available");
 					ENGINE_finish(e);
 					}
 				else
 					{
-					BIO_printf(bio_out, "unavailable");
+					BIO_printf(bio_out, " unavailable");
 					ERR_clear_error();
 					}
 				}
+			if (list_cap)
+				{
+				int cap_size = 256;
+				char *cap_buf = NULL;
+
+				if (ENGINE_get_RSA(e) != NULL
+					&& !append_buf(&cap_buf, "RSA",
+						&cap_size, 256))
+					goto end;
+				if (ENGINE_get_DSA(e) != NULL
+					&& !append_buf(&cap_buf, "DSA",
+						&cap_size, 256))
+					goto end;
+				if (ENGINE_get_DH(e) != NULL
+					&& !append_buf(&cap_buf, "DH",
+						&cap_size, 256))
+					goto end;
+				if (ENGINE_get_RAND(e) != NULL
+					&& !append_buf(&cap_buf, "RAND",
+						&cap_size, 256))
+					goto end;
+
+				if (*cap_buf != '\0')
+					BIO_printf(bio_out, " [%s]", cap_buf);
+
+				OPENSSL_free(cap_buf);
+				}
 			BIO_printf(bio_out, "\n");
 			}
 		else
@@ -187,10 +237,9 @@ int MAIN(int argc, char **argv)
 		}
 
 	ret=0;
-	ERR_print_errors(bio_err);
 end:
+	ERR_print_errors(bio_err);
 	sk_pop_free(engines, identity);
 	if (bio_out != NULL) BIO_free_all(bio_out);
 	EXIT(ret);
 	}
-
-- 
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