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contrib: embedded-wg-library: add ability to add and del interfaces 

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2018-02-21 02:53:06 +01:00
parent d29e0bad7d
commit 295c9ff274
3 changed files with 109 additions and 3 deletions
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39
contrib/embeddable-wg-library/test.c
View File

@ -8,7 +8,7 @@
#include <string.h>
#include <stdlib.h>
int main(int argc, char *argv[])
void list_devices(void)
{
char *device_names, *device_name;
size_t len;
@ -16,7 +16,7 @@ int main(int argc, char *argv[])
device_names = wg_list_device_names();
if (!device_names) {
perror("Unable to get device names");
return 1;
exit(1);
}
wg_for_each_device_name(device_names, device_name, len) {
wg_device *device;
@ -36,5 +36,40 @@ int main(int argc, char *argv[])
wg_free_device(device);
}
free(device_names);
}
int main(int argc, char *argv[])
{
wg_peer new_peer = {
.flags = WGPEER_HAS_PUBLIC_KEY | WGPEER_REPLACE_ALLOWEDIPS
};
wg_device new_device = {
.name = "wgtest0",
.listen_port = 1234,
.flags = WGDEVICE_HAS_PRIVATE_KEY | WGDEVICE_HAS_LISTEN_PORT,
.first_peer = &new_peer,
.last_peer = &new_peer
};
wg_key_from_base64(new_device.private_key, "SFLKy56SOiFoAvQDSCBRrH/nyYonuAQnyr/JTQRPDlU=");
wg_key_from_base64(new_peer.public_key, "aNoLvvCfgbtTf4f2Eb/CWVNvIc5AJt/4C4pKrxMUZlM=");
if (wg_add_device(new_device.name) < 0) {
perror("Unable to add device");
exit(1);
}
if (wg_set_device(&new_device) < 0) {
perror("Unable to set device");
exit(1);
}
list_devices();
if (wg_del_device(new_device.name) < 0) {
perror("Unable to delete device");
exit(1);
}
return 0;
}

71
contrib/embeddable-wg-library/wireguard.c
View File

@ -910,7 +910,7 @@ static int parse_linkinfo(const struct nlattr *attr, void *data)
{
struct inflatable_buffer *buffer = data;
if (mnl_attr_get_type(attr) == IFLA_INFO_KIND && !strcmp("wireguard", mnl_attr_get_str(attr)))
if (mnl_attr_get_type(attr) == IFLA_INFO_KIND && !strcmp(WG_GENL_NAME, mnl_attr_get_str(attr)))
buffer->good = true;
return MNL_CB_OK;
}
@ -1006,6 +1006,65 @@ cleanup:
return ret;
}
static int add_del_iface(const char *ifname, bool add)
{
struct mnl_socket *nl = NULL;
char *rtnl_buffer;
ssize_t len;
int ret;
struct nlmsghdr *nlh;
struct ifinfomsg *ifm;
struct nlattr *nest;
rtnl_buffer = calloc(MNL_SOCKET_BUFFER_SIZE, 1);
if (!rtnl_buffer) {
ret = -ENOMEM;
goto cleanup;
}
nl = mnl_socket_open(NETLINK_ROUTE);
if (!nl) {
ret = -errno;
goto cleanup;
}
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
ret = -errno;
goto cleanup;
}
nlh = mnl_nlmsg_put_header(rtnl_buffer);
nlh->nlmsg_type = add ? RTM_NEWLINK : RTM_DELLINK;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | (add ? NLM_F_CREATE | NLM_F_EXCL : 0);
nlh->nlmsg_seq = time(NULL);
ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm));
ifm->ifi_family = AF_UNSPEC;
mnl_attr_put_strz(nlh, IFLA_IFNAME, ifname);
nest = mnl_attr_nest_start(nlh, IFLA_LINKINFO);
mnl_attr_put_strz(nlh, IFLA_INFO_KIND, WG_GENL_NAME);
mnl_attr_nest_end(nlh, nest);
if (mnl_socket_sendto(nl, rtnl_buffer, nlh->nlmsg_len) < 0) {
ret = -errno;
goto cleanup;
}
if ((len = mnl_socket_recvfrom(nl, rtnl_buffer, MNL_SOCKET_BUFFER_SIZE)) < 0) {
ret = -errno;
goto cleanup;
}
if (mnl_cb_run(rtnl_buffer, len, nlh->nlmsg_seq, mnl_socket_get_portid(nl), NULL, NULL) < 0) {
ret = -errno;
goto cleanup;
}
ret = 0;
cleanup:
free(rtnl_buffer);
if (nl)
mnl_socket_close(nl);
return ret;
}
int wg_set_device(wg_device *dev)
{
int ret = 0;
@ -1424,6 +1483,16 @@ err:
return buffer.buffer;
}
int wg_add_device(const char *device_name)
{
return add_del_iface(device_name, true);
}
int wg_del_device(const char *device_name)
{
return add_del_iface(device_name, false);
}
void wg_free_device(wg_device *dev)
{
wg_peer *peer, *np;

2
contrib/embeddable-wg-library/wireguard.h
View File

@ -83,6 +83,8 @@ typedef struct wg_device {
int wg_set_device(wg_device *dev);
int wg_get_device(wg_device **dev, const char *device_name);
int wg_add_device(const char *device_name);
int wg_del_device(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);