1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /*
3 * Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
4 */
5
6 #include <string.h>
7 #include <stdlib.h>
8 #include <errno.h>
9 #include "containers.h"
10 #include "ipc.h"
11
12 struct string_list {
13 char *buffer;
14 size_t len;
15 size_t cap;
16 };
17
string_list_add(struct string_list * list,const char * str)18 static int string_list_add(struct string_list *list, const char *str)
19 {
20 size_t len = strlen(str) + 1;
21
22 if (len == 1)
23 return 0;
24
25 if (len >= list->cap - list->len) {
26 char *new_buffer;
27 size_t new_cap = list->cap * 2;
28
29 if (new_cap < list->len + len + 1)
30 new_cap = list->len + len + 1;
31 new_buffer = realloc(list->buffer, new_cap);
32 if (!new_buffer)
33 return -errno;
34 list->buffer = new_buffer;
35 list->cap = new_cap;
36 }
37 memcpy(list->buffer + list->len, str, len);
38 list->len += len;
39 list->buffer[list->len] = '\0';
40 return 0;
41 }
42
43 #include "ipc-uapi.h"
44 #if defined(__linux__)
45 #include "ipc-linux.h"
46 #elif defined(__OpenBSD__)
47 #include "ipc-openbsd.h"
48 #elif defined(__FreeBSD__)
49 #include "ipc-freebsd.h"
50 #elif defined(_WIN32)
51 #include "ipc-windows.h"
52 #endif
53
54 /* first\0second\0third\0forth\0last\0\0 */
ipc_list_devices(void)55 char *ipc_list_devices(void)
56 {
57 struct string_list list = { 0 };
58 int ret;
59
60 #ifdef IPC_SUPPORTS_KERNEL_INTERFACE
61 ret = kernel_get_wireguard_interfaces(&list);
62 if (ret < 0)
63 goto cleanup;
64 #endif
65 ret = userspace_get_wireguard_interfaces(&list);
66 if (ret < 0)
67 goto cleanup;
68
69 cleanup:
70 errno = -ret;
71 if (errno) {
72 free(list.buffer);
73 return NULL;
74 }
75 return list.buffer ?: strdup("\0");
76 }
77
ipc_get_device(struct wgdevice ** dev,const char * iface)78 int ipc_get_device(struct wgdevice **dev, const char *iface)
79 {
80 #ifdef IPC_SUPPORTS_KERNEL_INTERFACE
81 if (userspace_has_wireguard_interface(iface))
82 return userspace_get_device(dev, iface);
83 return kernel_get_device(dev, iface);
84 #else
85 return userspace_get_device(dev, iface);
86 #endif
87 }
88
ipc_set_device(struct wgdevice * dev)89 int ipc_set_device(struct wgdevice *dev)
90 {
91 #ifdef IPC_SUPPORTS_KERNEL_INTERFACE
92 if (userspace_has_wireguard_interface(dev->name))
93 return userspace_set_device(dev);
94 return kernel_set_device(dev);
95 #else
96 return userspace_set_device(dev);
97 #endif
98 }
99