1 files changed, 108 insertions, 0 deletions
diff --git a/tc/tc_exec.c b/tc/tc_exec.c
new file mode 100644
index 0000000..9b912ce
--- /dev/null
+++ b/tc/tc_exec.c
@@ -0,0 +1,108 @@
+/*
+ * tc_exec.c	"tc exec".
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Daniel Borkmann <daniel@iogearbox.net>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+
+#include "utils.h"
+
+#include "tc_util.h"
+#include "tc_common.h"
+
+static struct exec_util *exec_list;
+static void *BODY;
+
+static void usage(void)
+{
+	fprintf(stderr,
+		"Usage: tc exec [ EXEC_TYPE ] [ help | OPTIONS ]\n"
+		"Where:\n"
+		"EXEC_TYPE := { bpf | etc. }\n"
+		"OPTIONS := ... try tc exec <desired EXEC_KIND> help\n");
+}
+
+static int parse_noeopt(struct exec_util *eu, int argc, char **argv)
+{
+	if (argc) {
+		fprintf(stderr, "Unknown exec \"%s\", hence option \"%s\" is unparsable\n",
+			eu->id, *argv);
+		return -1;
+	}
+
+	return 0;
+}
+
+static struct exec_util *get_exec_kind(const char *name)
+{
+	struct exec_util *eu;
+	char buf[256];
+	void *dlh;
+
+	for (eu = exec_list; eu; eu = eu->next)
+		if (strcmp(eu->id, name) == 0)
+			return eu;
+
+	snprintf(buf, sizeof(buf), "%s/e_%s.so", get_tc_lib(), name);
+	dlh = dlopen(buf, RTLD_LAZY);
+	if (dlh == NULL) {
+		dlh = BODY;
+		if (dlh == NULL) {
+			dlh = BODY = dlopen(NULL, RTLD_LAZY);
+			if (dlh == NULL)
+				goto noexist;
+		}
+	}
+
+	snprintf(buf, sizeof(buf), "%s_exec_util", name);
+	eu = dlsym(dlh, buf);
+	if (eu == NULL)
+		goto noexist;
+reg:
+	eu->next = exec_list;
+	exec_list = eu;
+
+	return eu;
+noexist:
+	eu = calloc(1, sizeof(*eu));
+	if (eu) {
+		strncpy(eu->id, name, sizeof(eu->id) - 1);
+		eu->parse_eopt = parse_noeopt;
+		goto reg;
+	}
+
+	return eu;
+}
+
+int do_exec(int argc, char **argv)
+{
+	struct exec_util *eu;
+	char kind[FILTER_NAMESZ] = {};
+
+	if (argc < 1) {
+		fprintf(stderr, "No command given, try \"tc exec help\".\n");
+		return -1;
+	}
+
+	if (matches(*argv, "help") == 0) {
+		usage();
+		return 0;
+	}
+
+	strncpy(kind, *argv, sizeof(kind) - 1);
+
+	eu = get_exec_kind(kind);
+
+	argc--;
+	argv++;
+
+	return eu->parse_eopt(eu, argc, argv);
+}