move to new skeleton

tutorials/tcpip/tap-driver/main.c

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+// Copyright (c) 2022 Cesanta Software Limited
+// All rights reserved
+//
+// example using built-in TCP/IP stack and TUN/TAP interface
+
+#include <sys/socket.h>
+#ifndef __OpenBSD__
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#else
+#include <net/if.h>
+#include <net/if_tun.h>
+#include <net/if_types.h>
+#endif
+#include <sys/ioctl.h>
+
+#include "mongoose.h"
+#include "net.h"
+
+static int s_signo;
+void signal_handler(int signo) {
+  s_signo = signo;
+}
+
+static size_t tap_tx(const void *buf, size_t len, struct mg_tcpip_if *ifp) {
+  ssize_t res = write(*(int *) ifp->driver_data, buf, len);
+  if (res < 0) {
+    MG_ERROR(("tap_tx failed: %d", errno));
+    return 0;
+  }
+  return (size_t) res;
+}
+
+static bool tap_up(struct mg_tcpip_if *ifp) {
+  return ifp->driver_data ? true : false;
+}
+
+static size_t tap_rx(void *buf, size_t len, struct mg_tcpip_if *ifp) {
+  ssize_t received = read(*(int *) ifp->driver_data, buf, len);
+  usleep(1);  // This is to avoid 100% CPU
+  if (received < 0) return 0;
+  return (size_t) received;
+}
+
+int main(int argc, char *argv[]) {
+  const char *iface = "tap0";             // Network iface
+  const char *mac = "02:00:01:02:03:77";  // MAC address
+
+  // Parse options
+  for (int i = 1; i < argc; i++) {
+    if (strcmp(argv[i], "-i") == 0 && i + 1 < argc) {
+      iface = argv[++i];
+    } else if (strcmp(argv[i], "-mac") == 0 && i + 1 < argc) {
+      mac = argv[++i];
+    } else if (strcmp(argv[i], "-v") == 0 && i + 1 < argc) {
+      mg_log_set(atoi(argv[++i]));
+    } else {
+      MG_ERROR(("unknown option %s", argv[i]));
+      return EXIT_FAILURE;
+    }
+  }
+
+  // Open network interface
+#ifndef __OpenBSD__
+  const char *tuntap_device = "/dev/net/tun";
+#else
+  const char *tuntap_device = "/dev/tap0";
+#endif
+  int fd = open(tuntap_device, O_RDWR);
+  struct ifreq ifr;
+  memset(&ifr, 0, sizeof(ifr));
+  strncpy(ifr.ifr_name, iface, IFNAMSIZ);
+#ifndef __OpenBSD__
+  ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+  if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
+    MG_ERROR(("Failed to setup TAP interface: %s", ifr.ifr_name));
+    abort();  // return EXIT_FAILURE;
+  }
+#else
+  ifr.ifr_flags = (short) (IFF_UP | IFF_BROADCAST | IFF_MULTICAST);
+  if (ioctl(fd, TUNSIFMODE, (void *) &ifr) < 0) {
+    MG_ERROR(("Failed to setup TAP interface: %s", ifr.ifr_name));
+    abort();  // return EXIT_FAILURE;
+  }
+#endif
+  fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);  // Non-blocking mode
+
+  MG_INFO(("Opened TAP interface: %s", iface));
+  signal(SIGINT, signal_handler);
+  signal(SIGTERM, signal_handler);
+
+  struct mg_mgr mgr;  // Event manager
+  mg_mgr_init(&mgr);  // Initialise event manager
+
+  struct mg_tcpip_driver driver = {.tx = tap_tx, .up = tap_up, .rx = tap_rx};
+  struct mg_tcpip_if mif = {.driver = &driver, .driver_data = &fd};
+  sscanf(mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &mif.mac[0], &mif.mac[1],
+         &mif.mac[2], &mif.mac[3], &mif.mac[4], &mif.mac[5]);
+  mg_tcpip_init(&mgr, &mif);
+  MG_INFO(("Init done, starting main loop"));
+
+  // Start infinite event loop
+  MG_INFO(("Mongoose version : v%s", MG_VERSION));
+  MG_INFO(("Listening on     : %s", HTTP_URL));
+  MG_INFO(("Listening on     : %s", HTTPS_URL));
+
+  web_init(&mgr);
+  while (s_signo == 0) mg_mgr_poll(&mgr, 100);  // Infinite event loop
+
+  mg_mgr_free(&mgr);
+  close(fd);
+  printf("Exiting on signal %d\n", s_signo);
+
+  return 0;
+}