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// SPDX-License-Identifier: GPL-2.0
/*
* rv tool, the interface for the Linux kernel RV subsystem and home of
* user-space controlled monitors.
*
* Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org>
*/
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <trace.h>
#include <utils.h>
#include <in_kernel.h>
static int stop_session;
/*
* stop_rv - tell monitors to stop
*/
static void stop_rv(int sig)
{
stop_session = 1;
}
/**
* should_stop - check if the monitor should stop.
*
* Returns 1 if the monitor should stop, 0 otherwise.
*/
int should_stop(void)
{
return stop_session;
}
/*
* rv_list - list all available monitors
*/
static void rv_list(int argc, char **argv)
{
static const char *const usage[] = {
"",
" usage: rv list [-h]",
"",
" list all available monitors",
"",
" -h/--help: print this menu",
NULL,
};
int i;
if (argc > 1) {
fprintf(stderr, "rv version %s\n", VERSION);
/* more than 1 is always usage */
for (i = 0; usage[i]; i++)
fprintf(stderr, "%s\n", usage[i]);
/* but only -h is valid */
if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))
exit(0);
else
exit(1);
}
ikm_list_monitors();
exit(0);
}
/*
* rv_mon - try to run a monitor passed as argument
*/
static void rv_mon(int argc, char **argv)
{
char *monitor_name;
int i, run = 0;
static const char *const usage[] = {
"",
" usage: rv mon [-h] monitor [monitor options]",
"",
" run a monitor",
"",
" -h/--help: print this menu",
"",
" monitor [monitor options]: the monitor, passing",
" the arguments to the [monitor options]",
NULL,
};
/* requires at least one argument */
if (argc == 1) {
fprintf(stderr, "rv version %s\n", VERSION);
for (i = 0; usage[i]; i++)
fprintf(stderr, "%s\n", usage[i]);
exit(1);
} else if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
fprintf(stderr, "rv version %s\n", VERSION);
for (i = 0; usage[i]; i++)
fprintf(stderr, "%s\n", usage[i]);
exit(0);
}
monitor_name = argv[1];
/*
* Call all possible monitor implementations, looking
* for the [monitor].
*/
run += ikm_run_monitor(monitor_name, argc-1, &argv[1]);
if (!run)
err_msg("rv: monitor %s does not exist\n", monitor_name);
exit(!run);
}
static void usage(int exit_val, const char *fmt, ...)
{
char message[1024];
va_list ap;
int i;
static const char *const usage[] = {
"",
" usage: rv command [-h] [command_options]",
"",
" -h/--help: print this menu",
"",
" command: run one of the following command:",
" list: list all available monitors",
" mon: run a monitor",
"",
" [command options]: each command has its own set of options",
" run rv command -h for further information",
NULL,
};
va_start(ap, fmt);
vsnprintf(message, sizeof(message), fmt, ap);
va_end(ap);
fprintf(stderr, "rv version %s: %s\n", VERSION, message);
for (i = 0; usage[i]; i++)
fprintf(stderr, "%s\n", usage[i]);
exit(exit_val);
}
/*
* main - select which main sending the command
*
* main itself redirects the arguments to the sub-commands
* to handle the options.
*
* subcommands should exit.
*/
int main(int argc, char **argv)
{
if (geteuid())
usage(1, "%s needs root permission", argv[0]);
if (argc <= 1)
usage(1, "%s requires a command", argv[0]);
if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))
usage(0, "help");
if (!strcmp(argv[1], "list"))
rv_list(--argc, &argv[1]);
if (!strcmp(argv[1], "mon")) {
/*
* monitor's main should monitor should_stop() function.
* and exit.
*/
signal(SIGINT, stop_rv);
rv_mon(argc - 1, &argv[1]);
}
/* invalid sub-command */
usage(1, "%s does not know the %s command, old version?", argv[0], argv[1]);
}
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