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-rw-r--r--tc/tc_exec.c108
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);
+}