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#include <stdio.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <unistd.h>
#include "lib/lists.h"
#include "lib/ip.h"
#include "lib/socket.h"
#include "nest/iface.h"
#include "sysdep/unix/unix.h"
#include "sysdep/unix/wg_user.h"
#include "sysdep/linux/wireguard.h"
static
char *get_socket_path(const char *ifname, char *buf, uint size)
{
bsnprintf(buf, size, SOCKET_PATH "%s.sock", ifname);
return buf;
}
bool wg_has_userspace(const char *ifname)
{
struct stat sb;
char tmp[sizeof(struct sockaddr_un)];
if (stat(get_socket_path(ifname, tmp, sizeof(tmp)), &sb) == 0)
return (sb.st_mode & S_IFMT) == S_IFSOCK;
else
{
DBG(L_TRACE "WG: no socket %s", tmp);
return false;
}
}
/* NULL=receiving turned off, returns 1 to clear rx buffer */
static
int user_rx_hook(struct birdsock *sk UNUSED, uint size UNUSED)
{
DBG(L_TRACE "WG: RX %p %d", sk, size);
rfree(sk);
return 1;
}
static
void user_tx_hook(struct birdsock *bs)
{
DBG(L_TRACE "WG: TX %p %d", bs, bs->tpos - bs->ttx);
}
/* errno or zero if EOF */
static
void user_err_hook(struct birdsock *bs, int err)
{
/* if (err == 0) */
/* return; */
log(L_TRACE "WG: ERR %p %d %s", bs, err, bs->err);
rfree(bs);
}
static void
wg_puts(const char *str, byte **buf, uint *size)
{
int len = strlen(str);
if (0 < len && len < (int)*size)
{
strcpy(*buf, str);
*size -= len;
*buf += len;
}
else
*size = 0;
}
static void
wg_put_str(const char *key, const char *value, byte **buf, uint *size)
{
char tmp[128];
int len = snprintf(tmp, sizeof(tmp), "%s=%s\n", key, value);
if (0 < len && len < (int)*size)
{
strcpy(*buf, tmp);
*size -= len;
*buf += len;
}
else
*size = 0;
}
static void
wg_put_u16(const char *key, u16 value, byte **buf, uint *size)
{
char tmp[64];
int len = snprintf(tmp, sizeof(tmp), "%u", value);
if (len > 0)
wg_put_str(key, tmp, buf, size);
else
*size = 0;
}
static void
wg_put_bool(const char *key, bool value, byte **buf, uint *size)
{
if (value)
wg_put_str(key, "true", buf, size);
}
static void
wg_put_key(const char *key, wg_key value, byte **buf, uint *size)
{
char tmp[128];
for (uint i=0; i < sizeof(wg_key); i++)
bsnprintf(tmp+2*i, sizeof(tmp)-2*i, "%02x", value[i]);
wg_put_str(key, tmp, buf, size);
}
static void
wg_put_endpoint(const wg_endpoint *endpoint, byte **buf, uint *size)
{
char tmp[INET6_ADDRSTRLEN + 16];
ip_addr ip;
struct iface *ifa = NULL;
uint port = 0;
if (sockaddr_read((sockaddr*)&endpoint->addr, endpoint->addr.sa_family,
&ip, &ifa, &port) == 0)
{
char *pos = NULL;
if (ipa_is_ip4(ip))
pos = ip4_ntop(ipa_to_ip4(ip), tmp);
else
{
tmp[0] = '[';
pos = ip6_ntop(ipa_to_ip6(ip), tmp + 1);
if (ifa)
pos += bsprintf(pos, "%%%u", ifa->index);
*pos++ = ']';
}
bsprintf(pos, ":%u", port);
wg_put_str("endpoint", tmp, buf, size);
}
}
static void
wg_put_allowedip(wg_allowedip *allowedip, byte **buf, uint *size)
{
char tmp[INET6_ADDRSTRLEN + 10];
ip_addr ip = IP6_NONE;
switch (allowedip->family)
{
case AF_INET:
ip = ipa_from_in4(allowedip->ip4);
break;
case AF_INET6:
ip = ipa_from_in6(allowedip->ip6);
break;
default:
return;
}
int res = bsnprintf(tmp, sizeof(tmp), "%I/%u", ip, allowedip->cidr);
if (res < 0)
{
*size = 0;
return;
}
wg_put_str("allowed_ip", tmp, buf, size);
}
static int
user_put_device(wg_device *dev, byte **buf, uint *size)
{
wg_put_u16("set", 1, buf, size);
wg_put_key("private_key", dev->private_key, buf, size);
wg_put_u16("listen_port", dev->listen_port, buf, size);
wg_put_bool("replace_peers", dev->flags & WGDEVICE_REPLACE_PEERS, buf, size);
wg_peer *peer = NULL;
wg_for_each_peer(dev, peer)
{
wg_put_key("public_key", peer->public_key, buf, size);
wg_put_endpoint(&peer->endpoint, buf, size);
wg_put_bool("replace_allowed_ips", peer->flags & WGPEER_REPLACE_ALLOWEDIPS, buf, size);
wg_allowedip *allowedip = NULL;
wg_for_each_allowedip(peer, allowedip)
{
wg_put_allowedip(allowedip, buf, size);
}
}
wg_puts("\n", buf, size);
if (*size > 0)
return 0;
else
return -1;
}
int
wg_user_set_device(struct pool *pool,
const char *ifname,
struct wg_device *dev)
{
char path[sizeof(struct sockaddr_un)];
bsnprintf(path, sizeof(path), SOCKET_PATH "%s.sock", ifname);
struct birdsock *sock = sk_new(pool);
sock->rx_hook = user_rx_hook;
sock->tx_hook = user_tx_hook;
sock->err_hook = user_err_hook;
int res = sk_connect_unix(sock, path);
DBG(L_TRACE "WG: socket %d %d %s", res, sock->fd, path);
if (res < 0)
{
rfree(sock);
return -1;
}
uint tbsize = 8192;
sk_set_tbsize(sock, tbsize);
sk_set_rbsize(sock, 16);
byte *pos = sock->tbuf;
uint size = tbsize;
int len = user_put_device(dev, &pos, &size);
DBG(L_TRACE "WG: put %d %s", size, sock->tbuf);
if (len < 0)
{
rfree(sock);
return -1;
}
res = sk_send(sock, tbsize - size);
/* Send data, <0=err, >0=ok, 0=sleep */
DBG(L_TRACE "WG: send %d", res);
/* abort(); */
return -1;
}
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