tools: first additions of userspace integration

This is designed to work with a server that follows this:

  struct sockaddr_un addr = {
      .sun_family = AF_UNIX,
      .sun_path = "/var/run/wireguard/wguserspace0.sock"
  };
  int fd, ret;
  ssize_t len;
  socklen_t socklen;
  struct wgdevice *device;

  fd = socket(AF_UNIX, SOCK_DGRAM, 0);
  if (fd < 0)
      exit(1);
  if (bind(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0)
      exit(1);

  for (;;) {
      /* First we look at how big the next message is, so we know how much to
       * allocate. Note on BSD you can instead use ioctl(fd, FIONREAD, &len). */
      len = recv(fd, NULL, 0, MSG_PEEK | MSG_TRUNC);
      if (len < 0) {
          handle_error();
          continue;
      }
      /* Next we allocate a buffer for the received data. */
      device = NULL;
      if (len) {
          device = malloc(len);
          if (!device) {
              handle_error();
              continue;
          }
      }
      /* Finally we receive the data, storing too the return address. */
      socklen = sizeof(addr);
      len = recvfrom(fd, device, len, 0, (struct sockaddr *)&addr, (socklen_t *)&socklen);
      if (len < 0) {
          handle_error();
          free(device);
          continue;
      }
      if (!len) { /* If len is zero, it's a "get" request, so we send our device back. */
          device = get_current_wireguard_device(&len);
          sendto(fd, device, len, 0, (struct sockaddr *)&addr, socklen);
      } else { /* Otherwise, we just received a wgdevice, so we should "set" and send back the return status. */
          ret = set_current_wireguard_device(device);
          sendto(fd, &ret, sizeof(ret), 0, (struct sockaddr *)&addr, socklen);
          free(device);
      }
  }

1 files changed, 5 insertions, 5 deletions

diff --git a/src/tools/show.c b/src/tools/show.c
index 7927534..d606b4e 100644
--- a/src/tools/show.c
+++ b/src/tools/show.c
@@ -326,7 +326,7 @@ int show_main(int argc, char *argv[])
 	}
 
 	if (argc == 1 || !strcmp(argv[1], "all")) {
-		char *interfaces = kernel_get_wireguard_interfaces(), *interface;
+		char *interfaces = get_wireguard_interfaces(), *interface;
 		if (!interfaces) {
 			perror("Unable to get devices");
 			return 1;
@@ -334,7 +334,7 @@ int show_main(int argc, char *argv[])
 		interface = interfaces;
 		for (size_t len = 0; (len = strlen(interface)); interface += len + 1) {
 			struct wgdevice *device = NULL;
-			if (kernel_get_device(&device, interface) < 0) {
+			if (get_device(&device, interface) < 0) {
 				perror("Unable to get device");
 				continue;
 			}
@@ -358,7 +358,7 @@ int show_main(int argc, char *argv[])
 			show_usage();
 			return 1;
 		}
-		interfaces = kernel_get_wireguard_interfaces();
+		interfaces = get_wireguard_interfaces();
 		if (!interfaces) {
 			perror("Unable to get devices");
 			return 1;
@@ -371,12 +371,12 @@ int show_main(int argc, char *argv[])
 		show_usage();
 	else {
 		struct wgdevice *device = NULL;
-		if (!kernel_has_wireguard_interface(argv[1])) {
+		if (!has_wireguard_interface(argv[1])) {
 			fprintf(stderr, "`%s` is not a valid WireGuard interface\n", argv[1]);
 			show_usage();
 			return 1;
 		}
-		if (kernel_get_device(&device, argv[1]) < 0) {
+		if (get_device(&device, argv[1]) < 0) {
 			perror("Unable to get device");
 			show_usage();
 			return 1;