/*
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* tc_exec.c "tc exec".
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Daniel Borkmann <daniel@iogearbox.net>
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include "utils.h"
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#include "tc_util.h"
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#include "tc_common.h"
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static struct exec_util *exec_list;
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static void *BODY;
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static void usage(void)
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{
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fprintf(stderr, "Usage: tc exec [ EXEC_TYPE ] [ help | OPTIONS ]\n");
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fprintf(stderr, "Where:\n");
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fprintf(stderr, "EXEC_TYPE := { bpf | etc. }\n");
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fprintf(stderr, "OPTIONS := ... try tc exec <desired EXEC_KIND> help\n");
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}
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static int parse_noeopt(struct exec_util *eu, int argc, char **argv)
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{
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if (argc) {
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fprintf(stderr, "Unknown exec \"%s\", hence option \"%s\" is unparsable\n",
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eu->id, *argv);
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return -1;
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}
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return 0;
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}
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static struct exec_util *get_exec_kind(const char *name)
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{
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struct exec_util *eu;
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char buf[256];
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void *dlh;
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for (eu = exec_list; eu; eu = eu->next)
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if (strcmp(eu->id, name) == 0)
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return eu;
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snprintf(buf, sizeof(buf), "%s/e_%s.so", get_tc_lib(), name);
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dlh = dlopen(buf, RTLD_LAZY);
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if (dlh == NULL) {
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dlh = BODY;
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if (dlh == NULL) {
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dlh = BODY = dlopen(NULL, RTLD_LAZY);
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if (dlh == NULL)
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goto noexist;
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}
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}
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snprintf(buf, sizeof(buf), "%s_exec_util", name);
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eu = dlsym(dlh, buf);
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if (eu == NULL)
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goto noexist;
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reg:
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eu->next = exec_list;
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exec_list = eu;
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return eu;
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noexist:
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eu = calloc(1, sizeof(*eu));
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if (eu) {
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strncpy(eu->id, name, sizeof(eu->id) - 1);
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eu->parse_eopt = parse_noeopt;
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goto reg;
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}
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return eu;
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}
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int do_exec(int argc, char **argv)
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{
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struct exec_util *eu;
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char kind[16] = {};
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if (argc < 1) {
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fprintf(stderr, "No command given, try \"tc exec help\".\n");
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return -1;
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}
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if (matches(*argv, "help") == 0) {
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usage();
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return 0;
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}
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strncpy(kind, *argv, sizeof(kind) - 1);
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eu = get_exec_kind(kind);
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argc--;
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argv++;
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return eu->parse_eopt(eu, argc, argv);
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}
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