added a BUILD_FROM_FD option, supporting credential parsing from stdin

src/libstrongswan/credentials/builder.c

@@ -17,6 +17,7 @@
 
 ENUM(builder_part_names, BUILD_FROM_FILE, BUILD_END,
 	"BUILD_FROM_FILE",
+	"BUILD_FROM_FD",
 	"BUILD_AGENT_SOCKET",
 	"BUILD_BLOB_ASN1_DER",
 	"BUILD_BLOB_PEM",

src/libstrongswan/credentials/builder.h

@@ -38,8 +38,10 @@ typedef builder_t* (*builder_constructor_t)(int subtype);
  * Parts to build credentials from.
  */
 enum builder_part_t {
-	/** path to a file containing an ASN.1 blob, char* */
+	/** path to a file encoded in any format, char* */
 	BUILD_FROM_FILE,
+	/** file descriptor to read data, encoded in any format, int */
+	BUILD_FROM_FD,
 	/** unix socket of a ssh/pgp agent, char* */
 	BUILD_AGENT_SOCKET,
 	/** DER encoded ASN.1 blob, chunk_t */

src/libstrongswan/credentials/credential_factory.c

@@ -183,6 +183,7 @@ static void* create(private_credential_factory_t *this, credential_type_t type,
 					builder->add(builder, part, va_arg(args, x509_flag_t));
 					continue;
 				case BUILD_KEY_SIZE:
+				case BUILD_FROM_FD:
 					builder->add(builder, part, va_arg(args, u_int));
 					continue;
 				case BUILD_NOT_BEFORE_TIME: