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117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
// Copyright (c) 2022 Cesanta Software Limited
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// All rights reserved
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//
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// example using MIP and a TUN/TAP interface
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static const char *s_listening_address = "http://0.0.0.0:8000";
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#include <sys/socket.h>
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#ifndef __OpenBSD__
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#else
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#include <net/if.h>
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#include <net/if_tun.h>
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#include <net/if_types.h>
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#endif
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#include <sys/ioctl.h>
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#include "mongoose.h"
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static int s_signo;
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void signal_handler(int signo) {
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s_signo = signo;
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}
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static size_t tap_tx(const void *buf, size_t len, struct mip_if *ifp) {
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ssize_t res = write(*(int*) ifp->driver_data, buf, len);
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if (res < 0) {
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MG_ERROR(("tap_tx failed: %d", errno));
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return 0;
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}
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return (size_t) res;
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}
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static bool tap_up(struct mip_if *ifp) {
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return ifp->driver_data ? true : false;
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}
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static size_t tap_rx(void *buf, size_t len, struct mip_if *ifp) {
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ssize_t received = read(*(int *) ifp->driver_data, buf, len);
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usleep(1); // This is to avoid 100% CPU
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if (received < 0) return 0;
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return (size_t) received;
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}
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int main(int argc, char *argv[]) {
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const char *iface = "tap0"; // Network iface
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const char *mac = "02:00:01:02:03:77"; // MAC address
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// Parse options
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for (int i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-i") == 0 && i + 1 < argc) {
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iface = argv[++i];
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} else if (strcmp(argv[i], "-mac") == 0 && i + 1 < argc) {
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mac = argv[++i];
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} else if (strcmp(argv[i], "-v") == 0 && i + 1 < argc) {
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mg_log_set(atoi(argv[++i]));
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} else {
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MG_ERROR(("unknown option %s", argv[i]));
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return EXIT_FAILURE;
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}
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}
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// Open network interface
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#ifndef __OpenBSD__
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const char* tuntap_device = "/dev/net/tun";
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#else
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const char* tuntap_device = "/dev/tap0";
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#endif
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int fd = open(tuntap_device, O_RDWR);
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, iface, IFNAMSIZ);
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#ifndef __OpenBSD__
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
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MG_ERROR(("Failed to setup TAP interface: %s", ifr.ifr_name));
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abort(); // return EXIT_FAILURE;
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}
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#else
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ifr.ifr_flags = (short)(IFF_UP | IFF_BROADCAST | IFF_MULTICAST);
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if (ioctl(fd, TUNSIFMODE, (void *) &ifr) < 0) {
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MG_ERROR(("Failed to setup TAP interface: %s", ifr.ifr_name));
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abort(); // return EXIT_FAILURE;
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}
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#endif
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fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK); // Non-blocking mode
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MG_INFO(("Opened TAP interface: %s", iface));
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signal(SIGINT, signal_handler);
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signal(SIGTERM, signal_handler);
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struct mg_mgr mgr; // Event manager
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mg_mgr_init(&mgr); // Initialise event manager
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struct mip_driver driver = {.tx = tap_tx, .up = tap_up, .rx = tap_rx};
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struct mip_if mif = {.driver = &driver, .driver_data = &fd};
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sscanf(mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &mif.mac[0], &mif.mac[1],
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&mif.mac[2], &mif.mac[3], &mif.mac[4], &mif.mac[5]);
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mip_init(&mgr, &mif);
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MG_INFO(("Init done, starting main loop"));
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// Start infinite event loop
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MG_INFO(("Mongoose version : v%s", MG_VERSION));
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MG_INFO(("Listening on : %s", s_listening_address));
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extern void device_dashboard_fn(struct mg_connection *, int, void *, void *);
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mg_http_listen(&mgr, s_listening_address, device_dashboard_fn, NULL);
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while (s_signo == 0) mg_mgr_poll(&mgr, 100); // Infinite event loop
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mg_mgr_free(&mgr);
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close(fd);
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printf("Exiting on signal %d\n", s_signo);
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return 0;
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}
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