freebsd-dev/contrib/wireguard-tools/ipc.c

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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 <string.h>
#include <stdlib.h>
#include <errno.h>
#include "containers.h"
#include "ipc.h"
struct string_list {
char *buffer;
size_t len;
size_t cap;
};
static int string_list_add(struct string_list *list, const char *str)
{
size_t len = strlen(str) + 1;
if (len == 1)
return 0;
if (len >= list->cap - list->len) {
char *new_buffer;
size_t new_cap = list->cap * 2;
if (new_cap < list->len + len + 1)
new_cap = list->len + len + 1;
new_buffer = realloc(list->buffer, new_cap);
if (!new_buffer)
return -errno;
list->buffer = new_buffer;
list->cap = new_cap;
}
memcpy(list->buffer + list->len, str, len);
list->len += len;
list->buffer[list->len] = '\0';
return 0;
}
#include "ipc-uapi.h"
#if defined(__linux__)
#include "ipc-linux.h"
#elif defined(__OpenBSD__)
#include "ipc-openbsd.h"
#elif defined(__FreeBSD__)
#include "ipc-freebsd.h"
#elif defined(_WIN32)
#include "ipc-windows.h"
#endif
/* first\0second\0third\0forth\0last\0\0 */
char *ipc_list_devices(void)
{
struct string_list list = { 0 };
int ret;
#ifdef IPC_SUPPORTS_KERNEL_INTERFACE
ret = kernel_get_wireguard_interfaces(&list);
if (ret < 0)
goto cleanup;
#endif
ret = userspace_get_wireguard_interfaces(&list);
if (ret < 0)
goto cleanup;
cleanup:
errno = -ret;
if (errno) {
free(list.buffer);
return NULL;
}
return list.buffer ?: strdup("\0");
}
int ipc_get_device(struct wgdevice **dev, const char *iface)
{
#ifdef IPC_SUPPORTS_KERNEL_INTERFACE
if (userspace_has_wireguard_interface(iface))
return userspace_get_device(dev, iface);
return kernel_get_device(dev, iface);
#else
return userspace_get_device(dev, iface);
#endif
}
int ipc_set_device(struct wgdevice *dev)
{
#ifdef IPC_SUPPORTS_KERNEL_INTERFACE
if (userspace_has_wireguard_interface(dev->name))
return userspace_set_device(dev);
return kernel_set_device(dev);
#else
return userspace_set_device(dev);
#endif
}