Merge pull request #622 from juuz0/issue613

Provide HTTP URL for the server

include/server.h

@@ -60,7 +60,9 @@ namespace kiwix
         { m_withTaskbar = withTaskbar; m_withLibraryButton = withLibraryButton; }
        void setBlockExternalLinks(bool blockExternalLinks)
         { m_blockExternalLinks = blockExternalLinks; }
-
+       int getPort();
+       std::string getAddress();
+       
      protected:
        Library* mp_library;
        NameMapper* mp_nameMapper;

include/tools.h

@@ -22,6 +22,7 @@
 
 #include <string>
 #include <vector>
+#include <map>
 
 namespace kiwix {
 
@@ -194,5 +195,17 @@ bool fileExists(const std::string& path);
  * @return mimetype from filename in string format.
  */
 std::string getMimeTypeForFile(const std::string& filename);
+
+/** Provides all available network interfaces
+ * 
+ * This function provides the available IPv4 network interfaces
+ */
+std::map<std::string, std::string> getNetworkInterfaces();
+
+/** Provides the best IP address
+ * This function provides the best IP address from the list given by getNetworkInterfaces
+ */
+std::string getBestPublicIp();
+
 }
 #endif // KIWIX_TOOLS_H

src/server.cpp

@@ -71,4 +71,14 @@ void Server::setRoot(const std::string& root)
   }
 }
 
+int Server::getPort()
+{
+  return mp_server->getPort();
+}
+
+std::string Server::getAddress()
+{
+  return mp_server->getAddress();
+}
+
 }

src/server/internalServer.cpp

@@ -48,6 +48,7 @@ extern "C" {
 #include "tools/regexTools.h"
 #include "tools/stringTools.h"
 #include "tools/archiveTools.h"
+#include "tools/networkTools.h"
 #include "library.h"
 #include "name_mapper.h"
 #include "entry.h"
@@ -159,15 +160,16 @@ bool InternalServer::start() {
   sockAddr.sin_family = AF_INET;
   sockAddr.sin_port = htons(m_port);
   if (m_addr.empty()) {
-    if (0 != INADDR_ANY)
+    if (0 != INADDR_ANY) {
       sockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
+    }
+    m_addr = kiwix::getBestPublicIp();
   } else {
     if (inet_pton(AF_INET, m_addr.c_str(), &(sockAddr.sin_addr.s_addr)) == 0) {
       std::cerr << "Ip address " << m_addr << "  is not a valid ip address" << std::endl;
       return false;
     }
   }
-
   mp_daemon = MHD_start_daemon(flags,
                             m_port,
                             NULL,

src/server/internalServer.h

@@ -67,6 +67,8 @@ class InternalServer {
                                void** cont_cls);
     bool start();
     void stop();
+    std::string getAddress() { return m_addr; }
+    int getPort() { return m_port; } 
 
   private: // functions
     std::unique_ptr<Response> handle_request(const RequestContext& request);

src/tools/networkTools.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright 2012 Emmanuel Engelhart <kelson@kiwix.org>
+ * Copyright 2021 Nikhil Tanwar <2002nikhiltanwar@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU  General Public License as published by
@@ -17,6 +18,7 @@
  * MA 02110-1301, USA.
  */
 
+#include "tools.h"
 #include <tools/networkTools.h>
 
 #include <stdio.h>
@@ -29,6 +31,17 @@
 #include <iostream>
 #include <stdexcept>
 
+#ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <iostream>
+#else
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <netdb.h>
+#endif
 
 size_t write_callback_to_iss(char* ptr, size_t size, size_t nmemb, void* userdata)
 {
@@ -57,3 +70,104 @@ std::string kiwix::download(const std::string& url) {
   }
   return ss.str();
 }
+
+std::map<std::string, std::string> kiwix::getNetworkInterfaces() {
+  std::map<std::string, std::string> interfaces;
+
+#ifdef _WIN32
+  SOCKET sd = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0);
+  if (sd == SOCKET_ERROR) {
+    std::cerr << "Failed to get a socket. Error " << WSAGetLastError() << std::endl;
+    return interfaces;
+  }
+
+  INTERFACE_INFO InterfaceList[20];
+  unsigned long nBytesReturned;
+  if (WSAIoctl(sd, SIO_GET_INTERFACE_LIST, 0, 0, &InterfaceList,
+      sizeof(InterfaceList), &nBytesReturned, 0, 0) == SOCKET_ERROR) {
+    std::cerr << "Failed calling WSAIoctl: error " << WSAGetLastError() << std::endl;
+    return interfaces;
+  }
+
+  int nNumInterfaces = nBytesReturned / sizeof(INTERFACE_INFO);
+  for (int i = 0; i < nNumInterfaces; ++i) {
+    sockaddr_in *pAddress;
+    pAddress = (sockaddr_in *) & (InterfaceList[i].iiAddress.AddressIn);
+    if(pAddress->sin_family == AF_INET) {
+    /* Add to the map */
+    std::string interfaceName = std::string(inet_ntoa(pAddress->sin_addr));
+    interfaces[interfaceName] = interfaceName;
+    }
+  }
+#else
+  /* Get Network interfaces information */
+  char buf[16384];
+  struct ifconf ifconf;
+  int fd = socket(PF_INET, SOCK_DGRAM, 0); /* Only IPV4 */
+  ifconf.ifc_len = sizeof(buf);
+  ifconf.ifc_buf=buf;
+  if(ioctl(fd, SIOCGIFCONF, &ifconf)!=0) {
+    perror("ioctl(SIOCGIFCONF)");
+  }
+
+  /* Go through each interface */
+  struct ifreq *ifreq;
+  ifreq = ifconf.ifc_req;
+  for (int i = 0; i < ifconf.ifc_len; ) {
+    if (ifreq->ifr_addr.sa_family == AF_INET) {
+      /* Get the network interface ip */
+      char host[128] = { 0 };
+      const int error = getnameinfo(&(ifreq->ifr_addr), sizeof(ifreq->ifr_addr),
+                                    host, sizeof(host),
+                                    0, 0, NI_NUMERICHOST);
+      if (!error) {
+        std::string interfaceName = std::string(ifreq->ifr_name);
+        std::string interfaceIp = std::string(host);
+        /* Add to the map */
+        interfaces[interfaceName] = interfaceIp;
+      } else {
+        perror("getnameinfo()");
+      }
+    }
+
+    /* some systems have ifr_addr.sa_len and adjust the length that
+     * way, but not mine. weird */
+    size_t len;
+#ifndef __linux__
+    len = IFNAMSIZ + ifreq->ifr_addr.sa_len;
+#else
+    len = sizeof(*ifreq);
+#endif
+    ifreq = (struct ifreq*)((char*)ifreq+len);
+    i += len;
+  }
+#endif
+  return interfaces;
+}
+
+std::string kiwix::getBestPublicIp() {
+  auto interfaces = getNetworkInterfaces();
+
+#ifndef _WIN32
+  const char* const prioritizedNames[] =
+      { "eth0", "eth1", "wlan0", "wlan1", "en0", "en1" };
+  for(auto name: prioritizedNames) {
+    auto it = interfaces.find(name);
+    if(it != interfaces.end()) {
+      return it->second;
+    }
+  }
+#endif
+
+  const char* const prefixes[] = { "192.168", "172.16.", "10.0" };
+  for(auto prefix : prefixes){
+    for(auto& itr : interfaces) {
+      auto interfaceIp = itr.second;
+      if (interfaceIp.find(prefix) == 0) {
+        return interfaceIp;
+      }
+    }
+  }
+
+  return "127.0.0.1";
+}