1 /*
2  * Copyright 2022 Garmin Ltd. or its subsidiaries
3  *
4  * SPDX-License-Identifier: GPL-2.0
5  *
6  * Attempts to find and exec the host qemu-bridge-helper program
7  */
8 
9 #include <stdio.h>
10 #include <string.h>
11 #include <unistd.h>
12 #include <stdlib.h>
13 
14 void try_program(char const* path, char** args) {
15     if (access(path, X_OK) == 0) {
16         execv(path, args);
17     }
18 }
19 
20 int main(int argc, char** argv) {
21     char* var;
22 
23     var = getenv("QEMU_BRIDGE_HELPER");
24     if (var && var[0] != '\0') {
25         execvp(var, argv);
26         return 1;
27     }
28 
29     if (argc == 2 && strcmp(argv[1], "--help") == 0) {
30         fprintf(stderr, "Helper function to find and exec qemu-bridge-helper. Set QEMU_BRIDGE_HELPER to override default search path\n");
31         return 0;
32     }
33 
34     try_program("/usr/libexec/qemu-bridge-helper", argv);
35     try_program("/usr/lib/qemu/qemu-bridge-helper", argv);
36 
37     fprintf(stderr, "No bridge helper found\n");
38     return 1;
39 }
40 
41