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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "containers.h"
#include "config.h"
#include "ipc.h"
#include "subcommands.h"
struct peer_origin {
struct wgpeer *peer;
bool from_file;
};
static int peer_cmp(const void *first, const void *second)
{
const struct peer_origin *a = first, *b = second;
int ret = memcmp(a->peer->public_key, b->peer->public_key, WG_KEY_LEN);
if (ret)
return ret;
return a->from_file - b->from_file;
}
static bool sync_conf(struct wgdevice *file)
{
struct wgdevice *runtime;
struct wgpeer *peer;
struct peer_origin *peers;
size_t peer_count = 0, i = 0;
if (!file->first_peer)
return true;
for_each_wgpeer(file, peer)
++peer_count;
if (ipc_get_device(&runtime, file->name) != 0) {
perror("Unable to retrieve current interface configuration");
return false;
}
if (!runtime->first_peer) {
free_wgdevice(runtime);
return true;
}
file->flags &= ~WGDEVICE_REPLACE_PEERS;
for_each_wgpeer(runtime, peer)
++peer_count;
peers = calloc(peer_count, sizeof(*peers));
if (!peers) {
free_wgdevice(runtime);
perror("Peer list allocation");
return false;
}
for_each_wgpeer(file, peer) {
peers[i].peer = peer;
peers[i].from_file = true;
++i;
}
for_each_wgpeer(runtime, peer) {
peers[i].peer = peer;
peers[i].from_file = false;
++i;
}
qsort(peers, peer_count, sizeof(*peers), peer_cmp);
for (i = 0; i < peer_count; ++i) {
if (peers[i].from_file)
continue;
if (i == peer_count - 1 || !peers[i + 1].from_file || memcmp(peers[i].peer->public_key, peers[i + 1].peer->public_key, WG_KEY_LEN)) {
peer = calloc(1, sizeof(struct wgpeer));
if (!peer) {
free_wgdevice(runtime);
free(peers);
perror("Peer allocation");
return false;
}
peer->flags = WGPEER_REMOVE_ME;
memcpy(peer->public_key, peers[i].peer->public_key, WG_KEY_LEN);
peer->next_peer = file->first_peer;
file->first_peer = peer;
if (!file->last_peer)
file->last_peer = peer;
} else if (i < peer_count - 1 && peers[i + 1].from_file &&
(peers[i].peer->flags & WGPEER_HAS_PRESHARED_KEY) && !(peers[i + 1].peer->flags & WGPEER_HAS_PRESHARED_KEY) &&
!memcmp(peers[i].peer->public_key, peers[i + 1].peer->public_key, WG_KEY_LEN)) {
memset(peers[i + 1].peer->preshared_key, 0, WG_KEY_LEN);
peers[i + 1].peer->flags |= WGPEER_HAS_PRESHARED_KEY;
}
}
free_wgdevice(runtime);
free(peers);
return true;
}
int setconf_main(int argc, const char *argv[])
{
struct wgdevice *device = NULL;
struct config_ctx ctx;
FILE *config_input = NULL;
char *config_buffer = NULL;
size_t config_buffer_len = 0;
int ret = 1;
if (argc != 3) {
fprintf(stderr, "Usage: %s %s <interface> <configuration filename>\n", PROG_NAME, argv[0]);
return 1;
}
config_input = fopen(argv[2], "r");
if (!config_input) {
perror("fopen");
return 1;
}
if (!config_read_init(&ctx, !strcmp(argv[0], "addconf"))) {
fclose(config_input);
return 1;
}
while (getline(&config_buffer, &config_buffer_len, config_input) >= 0) {
if (!config_read_line(&ctx, config_buffer)) {
fprintf(stderr, "Configuration parsing error\n");
goto cleanup;
}
}
device = config_read_finish(&ctx);
if (!device) {
fprintf(stderr, "Invalid configuration\n");
goto cleanup;
}
strncpy(device->name, argv[1], IFNAMSIZ - 1);
device->name[IFNAMSIZ - 1] = '\0';
if (!strcmp(argv[0], "syncconf")) {
if (!sync_conf(device))
goto cleanup;
}
if (ipc_set_device(device) != 0) {
perror("Unable to modify interface");
goto cleanup;
}
ret = 0;
cleanup:
if (config_input)
fclose(config_input);
free(config_buffer);
free_wgdevice(device);
return ret;
}
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