contrib: add embeddable wireguard library

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-02-15 13:50:12 +01:00
parent 186df55998
commit 2f42abeb56
6 changed files with 1671 additions and 0 deletions

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test

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CFLAGS += -Wall
test: test.c wireguard.c wireguard.h
clean:
rm -f test
.PHONY: clean

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Embeddable WireGuard C Library
==============================
This is a mini single-file library, meant to be embedded directly into the
source code of your program. It is *not* meant to be built as a shared
library.
Usage
-----
Copy wireguard.c and wireguard.h into your project. They should build with
any C89 compiler. There are no dependencies except libc.
Please see the set of simple functions in wireguard.h for information on
how to use, as well as the example code in test.c.
License
-------
Because this uses code from libmnl, wireguard.c and wireguard.h are licensed
under the LGPL-2.1+.

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/* SPDX-License-Identifier: LGPL-2.1+
*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include "wireguard.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
char *device_names, *device_name;
size_t len;
device_names = wg_list_device_names();
if (!device_names) {
perror("Unable to get device names");
return 1;
}
wg_for_each_device_name(device_names, device_name, len) {
wg_device *device;
wg_peer *peer;
wg_key_b64_string key;
if (wg_get_device(&device, device_name) < 0) {
perror("Unable to get device");
continue;
}
wg_key_to_base64(key, device->public_key);
printf("%s has public key %s\n", device_name, key);
wg_for_each_peer(device, peer) {
wg_key_to_base64(key, peer->public_key);
printf(" - peer %s\n", key);
}
wg_free_device(device);
}
free(device_names);
return 0;
}

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/* SPDX-License-Identifier: LGPL-2.1+
*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#ifndef WIREGUARD_H
#define WIREGUARD_H
#include <net/if.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <time.h>
#include <stdint.h>
#include <stdbool.h>
typedef uint8_t wg_key[32];
typedef char wg_key_b64_string[((sizeof(wg_key) + 2) / 3) * 4 + 1];
typedef struct wg_allowedip {
uint16_t family;
union {
struct in_addr ip4;
struct in6_addr ip6;
};
uint8_t cidr;
struct wg_allowedip *next_allowedip;
} wg_allowedip;
enum wg_peer_flags {
WGPEER_REMOVE_ME = 1U << 0,
WGPEER_REPLACE_ALLOWEDIPS = 1U << 1,
WGPEER_HAS_PUBLIC_KEY = 1U << 2,
WGPEER_HAS_PRESHARED_KEY = 1U << 3,
WGPEER_HAS_PERSISTENT_KEEPALIVE_INTERVAL = 1U << 4
};
typedef struct wg_peer {
enum wg_peer_flags flags;
wg_key public_key;
wg_key preshared_key;
union {
struct sockaddr addr;
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
} endpoint;
struct timespec last_handshake_time;
uint64_t rx_bytes, tx_bytes;
uint16_t persistent_keepalive_interval;
struct wg_allowedip *first_allowedip, *last_allowedip;
struct wg_peer *next_peer;
} wg_peer;
enum wg_device_flags {
WGDEVICE_REPLACE_PEERS = 1U << 0,
WGDEVICE_HAS_PRIVATE_KEY = 1U << 1,
WGDEVICE_HAS_PUBLIC_KEY = 1U << 2,
WGDEVICE_HAS_LISTEN_PORT = 1U << 3,
WGDEVICE_HAS_FWMARK = 1U << 4
};
typedef struct wg_device {
char name[IFNAMSIZ];
uint32_t ifindex;
enum wg_device_flags flags;
wg_key public_key;
wg_key private_key;
uint32_t fwmark;
uint16_t listen_port;
struct wg_peer *first_peer, *last_peer;
} wg_device;
#define wg_for_each_device_name(__names, __name, __len) for ((__name) = (__names), (__len) = 0; ((__len) = strlen(__name)); (__name) += (__len) + 1)
#define wg_for_each_peer(__dev, __peer) for ((__peer) = (__dev)->first_peer; (__peer); (__peer) = (__peer)->next_peer)
#define wg_for_each_allowedip(__peer, __allowedip) for ((__allowedip) = (__peer)->first_allowedip; (__allowedip); (__allowedip) = (__allowedip)->next_allowedip)
int wg_set_device(wg_device *dev);
int wg_get_device(wg_device **dev, const char *device_name);
void wg_free_device(wg_device *dev);
char *wg_list_device_names(void); /* first\0second\0third\0forth\0last\0\0 */
void wg_key_to_base64(wg_key_b64_string base64, const wg_key key);
int wg_key_from_base64(wg_key key, const wg_key_b64_string base64);
bool wg_key_is_zero(const wg_key key);
#endif