miniupnpc_example.c

#include <miniupnpc/miniupnpc.h>
#include <miniupnpc/upnpcommands.h>
#include <miniupnpc/upnperrors.h>
#include <stdio.h>

int main() {
  struct UPNPUrls upnp_urls;
  struct IGDdatas upnp_data;
  struct UPNPDev *upnp_dev = 0;
  char aLanAddr[64];
  const char *pPort = "8000";

  int error = 0;
  upnp_dev = upnpDiscover(2000, NULL, NULL, 0, 0, 2, &error);
  // Retrieve a valid Internet Gateway Device
  int status = UPNP_GetValidIGD(upnp_dev, &upnp_urls, &upnp_data, aLanAddr,
                                sizeof(aLanAddr));
  printf("status=%d, lan_addr=%s\n", status, aLanAddr);

  if (status == 1) {
    printf("found valid IGD: %s\n", upnp_urls.controlURL);
    error =
        UPNP_AddPortMapping(upnp_urls.controlURL, upnp_data.first.servicetype,
                            pPort, // external port
                            pPort, // internal port
                            aLanAddr, "My Application Name", "UDP",
                            0,  // remote host
                            "0" // lease duration, recommended 0 as some NAT
                                // implementations may not support another value
        );

    if (error) {
      printf("failed to map port\n");
      printf("error: %s\n", strupnperror(error));
    } else
      printf("successfully mapped port\n");
  } else {
    printf("no valid IGD found\n");
  }

  // Open a socket bound to the internal port and do your stuff.

  // Cleanup

  error = UPNP_DeletePortMapping(upnp_urls.controlURL, upnp_data.first.servicetype,
                         pPort, "UDP", 0);

  if(error != 0) {
	  printf("port map deletion error: %s\n", strupnperror(error));
  }

  FreeUPNPUrls(&upnp_urls);
  freeUPNPDevlist(upnp_dev);
  return 0;
}