Initial implementation of the tpm2_contextload tool.

Makefile.am

@@ -199,7 +199,8 @@ tpm2_tools = \
     tools/tpm2_ecdhkeygen.c \
     tools/tpm2_ecdhzgen.c \
     tools/tpm2_zgen2phase.c \
-    tools/tpm2_sessionconfig.c
+    tools/tpm2_sessionconfig.c \
+    tools/tpm2_contextload.c
 
 # Create the symlinks for each tool to the tpm2 and optional tss2 bundled executables
 install-exec-hook:

tools/tpm2_contextload.c

@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "files.h"
+#include "log.h"
+#include "pcr.h"
+#include "tpm2_policy.h"
+#include "tpm2_tool.h"
+#include "tpm2_session.h"
+
+typedef struct tpm2_contextload_ctx tpm2_contextload_ctx;
+struct tpm2_contextload_ctx {
+    const char *session_path;
+    tpm2_session *session;
+};
+
+static tpm2_contextload_ctx ctx;
+
+static bool on_option(char key, char *value) {
+
+    switch (key) {
+    case 'S':
+        ctx.session_path = value;
+        break;
+    }
+    return true;
+}
+
+static bool tpm2_tool_onstart(tpm2_options **opts) {
+
+    static struct option topts[] = {
+        { "session",  required_argument,  NULL, 'S' },
+    };
+
+    *opts = tpm2_options_new("S:", ARRAY_LEN(topts), topts, on_option,
+    NULL, 0);
+
+    return *opts != NULL;
+}
+
+static tool_rc tpm2_tool_onrun(ESYS_CONTEXT *ectx, tpm2_option_flags flags) {
+
+    UNUSED(flags);
+
+    bool option_fail = false;
+    if (!ctx.session_path) {
+        LOG_ERR("Must specify -S session file.");
+        option_fail = true;
+    }
+
+    if (option_fail) {
+        return tool_rc_general_error;
+    }
+
+    tool_rc rc = tpm2_session_restore(ectx, ctx.session_path, false,
+            &ctx.session);
+    if (rc != tool_rc_success) {
+        return rc;
+    }
+
+    tpm2_tool_output("session handle: 0x%x\n", tpm2_session_get_handle(ctx.session));
+
+    return rc;
+}
+
+static tool_rc tpm2_tool_onstop(ESYS_CONTEXT *ectx) {
+    UNUSED(ectx);
+
+    return tpm2_session_close(&ctx.session);
+}
+
+// Register this tool with tpm2_tool.c
+TPM2_TOOL_REGISTER("contextload", tpm2_tool_onstart, tpm2_tool_onrun, NULL, NULL)