[API break] Move all the tools in the tools directory instead of common.

The `common` name is from the time where kiwix was only one repository
for all the project (android, desktop, server...).

Now we have split the repositories and kiwix-lib is the "common" repo,
the "common" directory is somehow nonsense.

src/tools/networkTools.cpp

@@ -0,0 +1,209 @@
+/*
+ * Copyright 2012 Emmanuel Engelhart <kelson@kiwix.org>
+ *
+ * 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
+ * the Free Software Foundation; either version 3 of the License, or
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <tools/networkTools.h>
+
+#ifdef _WIN32
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#else
+#include <net/if.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+#include <curl/curl.h>
+
+#include <sstream>
+#include <iostream>
+
+
+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)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);
+
+    /* Add to the map */
+    std::string interfaceName = std::string(inet_ntoa(pAddress->sin_addr));
+    std::string interfaceIp = std::string(inet_ntoa(pAddress->sin_addr));
+    interfaces.insert(
+        std::pair<std::string, std::string>(interfaceName, interfaceIp));
+  }
+#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)");
+    exit(EXIT_FAILURE);
+  }
+
+  /* Go through each interface */
+  int i;
+  size_t len;
+  struct ifreq* ifreq;
+  ifreq = ifconf.ifc_req;
+  for (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.insert(
+            std::pair<std::string, std::string>(interfaceName, interfaceIp));
+      } else {
+        perror("getnameinfo()");
+      }
+    }
+
+/* some systems have ifr_addr.sa_len and adjust the length that
+ * way, but not mine. weird */
+#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()
+{
+  std::map<std::string, std::string> interfaces = kiwix::getNetworkInterfaces();
+
+#ifndef _WIN32
+  const char* const prioritizedNames[]
+      = {"eth0", "eth1", "wlan0", "wlan1", "en0", "en1"};
+  const int count = (sizeof prioritizedNames) / (sizeof prioritizedNames[0]);
+  for (int i = 0; i < count; ++i) {
+    std::map<std::string, std::string>::const_iterator it
+        = interfaces.find(prioritizedNames[i]);
+    if (it != interfaces.end()) {
+      return it->second;
+    }
+  }
+#endif
+
+  for (std::map<std::string, std::string>::iterator iter = interfaces.begin();
+       iter != interfaces.end();
+       ++iter) {
+    std::string interfaceIp = iter->second;
+    if (interfaceIp.length() >= 7 && interfaceIp.substr(0, 7) == "192.168") {
+      return interfaceIp;
+    }
+  }
+
+  for (std::map<std::string, std::string>::iterator iter = interfaces.begin();
+       iter != interfaces.end();
+       ++iter) {
+    std::string interfaceIp = iter->second;
+    if (interfaceIp.length() >= 7 && interfaceIp.substr(0, 7) == "172.16.") {
+      return interfaceIp;
+    }
+  }
+
+  for (std::map<std::string, std::string>::iterator iter = interfaces.begin();
+       iter != interfaces.end();
+       ++iter) {
+    std::string interfaceIp = iter->second;
+    if (interfaceIp.length() >= 3 && interfaceIp.substr(0, 3) == "10.") {
+      return interfaceIp;
+    }
+  }
+
+  return "127.0.0.1";
+}
+
+size_t write_callback_to_iss(char* ptr, size_t size, size_t nmemb, void* userdata)
+{
+  auto str = static_cast<std::stringstream*>(userdata);
+  str->write(ptr, nmemb);
+  return nmemb;
+}
+
+std::string kiwix::download(const std::string& url) {
+  auto curl = curl_easy_init();
+  std::stringstream ss;
+  curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
+  curl_easy_setopt(curl, CURLOPT_HTTPGET, 1L);
+  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &write_callback_to_iss);
+  curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ss);
+  auto res = curl_easy_perform(curl);
+  if (res != CURLE_OK) {
+    curl_easy_cleanup(curl);
+    throw std::runtime_error("Cannot perform request");
+  }
+  long response_code;
+  curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
+  curl_easy_cleanup(curl);
+  if (response_code != 200) {
+    throw std::runtime_error("Invalid return code from server");
+  }
+  return ss.str();
+}