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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* tc_exec.c "tc exec".
*
* 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(const 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);
if (eu == NULL) {
fprintf(stderr, "Allocation failed finding exec\n");
return -1;
}
argc--;
argv++;
return eu->parse_eopt(eu, argc, argv);
}
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