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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2025 Didi Technology Co., Tao Chen */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <mntent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "json_writer.h"
#include "main.h"
#define MOUNTS_FILE "/proc/mounts"
static struct {
const char *header;
const char *key;
} sets[] = {
{"allowed_cmds", "delegate_cmds"},
{"allowed_maps", "delegate_maps"},
{"allowed_progs", "delegate_progs"},
{"allowed_attachs", "delegate_attachs"},
};
static bool has_delegate_options(const char *mnt_ops)
{
return strstr(mnt_ops, "delegate_cmds") ||
strstr(mnt_ops, "delegate_maps") ||
strstr(mnt_ops, "delegate_progs") ||
strstr(mnt_ops, "delegate_attachs");
}
static char *get_delegate_value(char *opts, const char *key)
{
char *token, *rest, *ret = NULL;
if (!opts)
return NULL;
for (token = strtok_r(opts, ",", &rest); token;
token = strtok_r(NULL, ",", &rest)) {
if (strncmp(token, key, strlen(key)) == 0 &&
token[strlen(key)] == '=') {
ret = token + strlen(key) + 1;
break;
}
}
return ret;
}
static void print_items_per_line(char *input, int items_per_line)
{
char *str, *rest;
int cnt = 0;
if (!input)
return;
for (str = strtok_r(input, ":", &rest); str;
str = strtok_r(NULL, ":", &rest)) {
if (cnt % items_per_line == 0)
printf("\n\t ");
printf("%-20s", str);
cnt++;
}
}
#define ITEMS_PER_LINE 4
static void show_token_info_plain(struct mntent *mntent)
{
size_t i;
printf("token_info %s", mntent->mnt_dir);
for (i = 0; i < ARRAY_SIZE(sets); i++) {
char *opts, *value;
printf("\n\t%s:", sets[i].header);
opts = strdup(mntent->mnt_opts);
value = get_delegate_value(opts, sets[i].key);
print_items_per_line(value, ITEMS_PER_LINE);
free(opts);
}
printf("\n");
}
static void split_json_array_str(char *input)
{
char *str, *rest;
if (!input) {
jsonw_start_array(json_wtr);
jsonw_end_array(json_wtr);
return;
}
jsonw_start_array(json_wtr);
for (str = strtok_r(input, ":", &rest); str;
str = strtok_r(NULL, ":", &rest)) {
jsonw_string(json_wtr, str);
}
jsonw_end_array(json_wtr);
}
static void show_token_info_json(struct mntent *mntent)
{
size_t i;
jsonw_start_object(json_wtr);
jsonw_string_field(json_wtr, "token_info", mntent->mnt_dir);
for (i = 0; i < ARRAY_SIZE(sets); i++) {
char *opts, *value;
jsonw_name(json_wtr, sets[i].header);
opts = strdup(mntent->mnt_opts);
value = get_delegate_value(opts, sets[i].key);
split_json_array_str(value);
free(opts);
}
jsonw_end_object(json_wtr);
}
static int __show_token_info(struct mntent *mntent)
{
if (json_output)
show_token_info_json(mntent);
else
show_token_info_plain(mntent);
return 0;
}
static int show_token_info(void)
{
FILE *fp;
struct mntent *ent;
fp = setmntent(MOUNTS_FILE, "r");
if (!fp) {
p_err("Failed to open: %s", MOUNTS_FILE);
return -1;
}
if (json_output)
jsonw_start_array(json_wtr);
while ((ent = getmntent(fp)) != NULL) {
if (strncmp(ent->mnt_type, "bpf", 3) == 0) {
if (has_delegate_options(ent->mnt_opts))
__show_token_info(ent);
}
}
if (json_output)
jsonw_end_array(json_wtr);
endmntent(fp);
return 0;
}
static int do_show(int argc, char **argv)
{
if (argc)
return BAD_ARG();
return show_token_info();
}
static int do_help(int argc, char **argv)
{
if (json_output) {
jsonw_null(json_wtr);
return 0;
}
fprintf(stderr,
"Usage: %1$s %2$s { show | list }\n"
" %1$s %2$s help\n"
" " HELP_SPEC_OPTIONS " }\n"
"\n"
"",
bin_name, argv[-2]);
return 0;
}
static const struct cmd cmds[] = {
{ "show", do_show },
{ "list", do_show },
{ "help", do_help },
{ 0 }
};
int do_token(int argc, char **argv)
{
return cmd_select(cmds, argc, argv, do_help);
}
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