[2286] | 1 | /**********************************************************************
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| 2 | *
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| 3 | * netio.cpp
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| 4 | * Copyright (C) 1996
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| 5 | *
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| 6 | * A component of the fnord webserver written by [email protected].
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| 7 | *
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| 8 | * Altered for use with the Greenstone digital library software by the
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| 9 | * New Zealand Digital Library Project at the University of Waikato,
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| 10 | * New Zealand.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or modify
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| 13 | * it under the terms of the GNU General Public License as published by
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| 14 | * the Free Software Foundation; either version 2 of the License, or
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| 15 | * (at your option) any later version.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful,
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| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 20 | * GNU General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, write to the Free Software
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| 24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 25 | *
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| 26 | *********************************************************************/
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[611] | 27 |
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| 28 | #include <windows.h>
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| 29 | #include <stdlib.h>
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| 30 | #include <stdio.h>
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| 31 | #include <string.h>
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| 32 | #include <memory.h>
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| 33 | #pragma hdrstop
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| 34 | #include "netio.h"
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| 35 | #include "locate.h"
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| 36 | #include "d_winsock.h"
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[19210] | 37 | #include "settings.h"
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[611] | 38 |
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| 39 | //Private Variables and Declarations
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| 40 |
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| 41 | //Max string size for a host name
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| 42 | #define MAXHOSTNAME 100
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| 43 |
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| 44 | //Timeout for waiting between "packets" in seconds
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| 45 | #define NETIO_CONN_TIMEOUT 20 //3 sec was 180 @@@@@ WJR
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| 46 |
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| 47 | #define HTTP_DNS_MSG WM_USER + 1
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| 48 | int dns_msg_received = 0;
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| 49 | int dns_msg_error = 0;
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| 50 |
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| 51 | DWORD LocalIPNumber;
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| 52 | char LocalName[MAXHOSTNAME];
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| 53 |
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| 54 | //Private Function Declarations
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| 55 | DWORD GetHostID();
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| 56 |
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| 57 | // returns 0 on success,
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| 58 | // WSASYSNOTREADY, WSAVERNOTSUPPORTED, or WSAEINVAL on failure
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| 59 | int InitNetIO() {
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[2286] | 60 | WSADATA Data;
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| 61 |
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| 62 | // Load Winsock
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| 63 | int err = d_WSAStartup(MAKEWORD(1, 1), &Data);
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| 64 |
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| 65 | // get local IP number
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| 66 | if (err == 0) LocalIPNumber = GetHostID();
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| 67 | else LocalIPNumber = INADDR_ANY;
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| 68 |
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| 69 | // set the Local Name to "" for now
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| 70 | LocalName[0] = 0;
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| 71 |
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| 72 | return err;
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[611] | 73 | }
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| 74 |
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| 75 |
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| 76 | void CleanUpNetIO() {
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[2286] | 77 | //Experimental, heard this will better clean up, especialy if a call is
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| 78 | //blocking....
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| 79 | d_WSAUnhookBlockingHook();
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[611] | 80 |
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[2286] | 81 | //Clean up Winsock
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[2353] | 82 | d_WSACleanup();
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[611] | 83 | }
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| 84 |
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| 85 |
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| 86 | void ResetNetIO() {
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[2286] | 87 | //Figure out the local name on first querry, set to "" until then...
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| 88 | LocalName[0] = 0;
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[611] | 89 | }
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| 90 |
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| 91 |
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| 92 | DWORD GetLocalIP() {
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[2286] | 93 | return LocalIPNumber;
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[611] | 94 | }
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| 95 |
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[28758] | 96 | LRESULT __stdcall DNSWindowProc(HWND hWnd,UINT wMsg, WPARAM wParam, LPARAM lParam) {
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[2286] | 97 | if (wMsg == HTTP_DNS_MSG) {
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| 98 | dns_msg_received = 1;
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| 99 | dns_msg_error = WSAGETASYNCERROR(lParam);
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| 100 | return 0;
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| 101 | }
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| 102 |
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| 103 | return DefWindowProc(hWnd, wMsg, wParam, lParam);
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[611] | 104 | }
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| 105 |
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[1203] | 106 | char *GetLocalName(HINSTANCE hInstance) {
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[2286] | 107 | // static in case it is written to after the function has finished
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| 108 | // (I did not error checking on WSACancelAsyncRequest)
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| 109 | static char buf[MAXGETHOSTSTRUCT];
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[611] | 110 |
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[2286] | 111 | if (LocalName[0] == 0) {
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| 112 | hostent *DNSResult = NULL;
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| 113 | in_addr LocalInAddr;
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| 114 |
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| 115 | // if we failed to get the local IP number
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| 116 | // use the loop-back device
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| 117 | if (LocalIPNumber == INADDR_ANY) {
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| 118 | strcpy(LocalName, "127.0.0.1"); // loop-back device
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| 119 | return LocalName;
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| 120 | }
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| 121 |
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| 122 | //Convert the number to an in_addr struct
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| 123 | LocalInAddr.s_addr = LocalIPNumber;
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| 124 |
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| 125 | // if we fail to find the domain name we will
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| 126 | // still want the IP address
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| 127 | strcpy(LocalName, d_inet_ntoa(LocalInAddr));
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| 128 |
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| 129 | // make sure they actually passed in an instance handle
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| 130 | if (hInstance == NULL) return LocalName;
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| 131 |
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| 132 | // do a async domain name lookup so that we
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| 133 | // can control the timeout
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| 134 |
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| 135 | // create a window class and window to handle the async messages
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| 136 | WNDCLASS wc; HWND hwndDNS;
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| 137 |
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| 138 | wc.style = 0;
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| 139 | wc.lpfnWndProc = DNSWindowProc;
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| 140 | wc.cbClsExtra = 0;
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| 141 | wc.cbWndExtra = 0;
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| 142 | wc.hInstance = hInstance;
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| 143 | wc.hIcon = NULL;
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| 144 | wc.hCursor = NULL;
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| 145 | wc.hbrBackground = NULL;
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| 146 | wc.lpszMenuName = NULL;
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| 147 | wc.lpszClassName = "GSDL DNS Window";
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| 148 | if (!RegisterClass(&wc)) return LocalName;
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| 149 |
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| 150 | hwndDNS = CreateWindow("GSDL DNS Window", "",
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| 151 | WS_OVERLAPPEDWINDOW, 0, 0, 100, 100,
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| 152 | NULL, NULL, hInstance, NULL);
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| 153 | if (!hwndDNS) return LocalName;
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| 154 |
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| 155 | // process all messages currently on the queue
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| 156 | MSG Message;
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| 157 | while (PeekMessage(&Message, NULL, 0, 0, PM_REMOVE)) {
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| 158 | TranslateMessage(&Message); /* translate keyboard messages */
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| 159 | DispatchMessage(&Message); /* return control to Windows NT */
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| 160 | }
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| 161 |
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| 162 | //Do a async DNS lookup on the IP number
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| 163 | dns_msg_received = 0;
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| 164 | dns_msg_error = 0;
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| 165 | HANDLE asyncGetHostReq = d_WSAAsyncGetHostByAddr(
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| 166 | hwndDNS, HTTP_DNS_MSG, (char *)&(LocalInAddr),
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| 167 | 4, PF_INET, buf, MAXGETHOSTSTRUCT);
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| 168 |
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| 169 | if (asyncGetHostReq != NULL) {
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| 170 | // wait 5 seconds for the request to complete
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| 171 | int now = GetTickCount();
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| 172 | while ((DiffTickCounts(now, GetTickCount()) < 5000) && !dns_msg_received) {
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| 173 | if (PeekMessage(&Message, NULL, 0, 0, PM_REMOVE)) {
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| 174 | TranslateMessage(&Message); /* translate keyboard messages */
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| 175 | DispatchMessage(&Message); /* return control to Windows NT */
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| 176 | } else {
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| 177 | Sleep(1);
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| 178 | }
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| 179 | }
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| 180 | if (!dns_msg_received)
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| 181 | d_WSACancelAsyncRequest(asyncGetHostReq);
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| 182 | }
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| 183 |
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| 184 | DestroyWindow(hwndDNS);
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| 185 |
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| 186 | if (dns_msg_received && (dns_msg_error == 0)) {
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| 187 | //Worked, use the primary name
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| 188 | strcpy(LocalName, ((hostent *)(buf))->h_name);
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| 189 | //Convert it to lower case for cosmedic reasons
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| 190 | CharLower(LocalName);
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| 191 | }
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| 192 | }
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| 193 | return LocalName;
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[611] | 194 | }
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| 195 |
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| 196 |
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| 197 | // returns 0 on success, and a WSA error message on failure.
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| 198 | // possible error messages include:
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| 199 | // WSANOTINITIALISED, WSAENETDOWN, WSAEAFNOSUPPORT, WSAEINPROGRESS, WSAEMFILE,
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| 200 | // WSAENOBUFS, WSAEPROTONOSUPPORT, WSAEPROTOTYPE, WSAESOCKTNOSUPPORT,
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| 201 | // WSAEADDRINUSE, WSAEINVAL, WSAEISCONN, WSAENOTSOCK, WSAEOPNOTSUPP
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| 202 |
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| 203 | #define MAXBINDCOUNT 4096
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[2286] | 204 | int CreateListeningSocket(int &PortNum, HWND MsgWindow,
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| 205 | WORD SocketMsg, SOCKET &ServerSocket) {
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| 206 | int err = 0;
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| 207 | SOCKADDR_IN ServerSockAddr;
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| 208 | int bind_port, bind_count;
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| 209 |
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| 210 | //Create the Server Socket
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| 211 | ServerSocket = d_socket(AF_INET, SOCK_STREAM, 0);
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| 212 | if (ServerSocket == INVALID_SOCKET) return d_WSAGetLastError();
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| 213 |
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| 214 | bind_port = PortNum;
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[9598] | 215 | for (bind_count=0; bind_count < MAXBINDCOUNT; ++bind_count) {
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[2286] | 216 | // Set up the Server Socket Address
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| 217 | memset(&ServerSockAddr, 0, sizeof(ServerSockAddr)); //Needed?
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| 218 | ServerSockAddr.sin_port = d_htons( (WORD) bind_port);
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| 219 | ServerSockAddr.sin_family = AF_INET;
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[19210] | 220 | if (gsdl_external_access) {
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| 221 | ServerSockAddr.sin_addr.s_addr = d_htonl(INADDR_ANY);
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| 222 | }
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| 223 | else {
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| 224 | ServerSockAddr.sin_addr.s_addr = d_htonl(INADDR_LOOPBACK);
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| 225 | }
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| 226 |
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| 227 |
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[2286] | 228 | // Try to bind the socket with the address
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| 229 | if (d_bind(ServerSocket, (LPSOCKADDR) &ServerSockAddr,
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| 230 | sizeof(ServerSockAddr)) != SOCKET_ERROR) {
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| 231 | PortNum = bind_port;
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| 232 | break;
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| 233 | }
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| 234 |
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| 235 | // make sure it failed to bind because it was
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| 236 | // already bound
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| 237 | err = d_WSAGetLastError ();
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| 238 | if (err != WSAEADDRINUSE) return err;
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| 239 |
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| 240 | // Or choose another port number to try
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[30565] | 241 | if (bind_port == 80) bind_port = IPPORT_RESERVED+1;
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[30561] | 242 | else if (bind_count == 0) bind_port = 8282;
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[9598] | 243 | else ++bind_port;
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[2286] | 244 | }
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| 245 |
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| 246 | // return an error in we couldn't find a valid port
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| 247 | if (bind_count == MAXBINDCOUNT) return WSAEADDRINUSE;
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| 248 |
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| 249 | // Start listening for connections
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| 250 | if (d_listen(ServerSocket, SOMAXCONN) == SOCKET_ERROR)
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| 251 | return d_WSAGetLastError ();
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| 252 |
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| 253 | // Set up event for new connections
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| 254 | if (d_WSAAsyncSelect(ServerSocket, MsgWindow, SocketMsg, FD_ACCEPT) == SOCKET_ERROR)
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| 255 | return d_WSAGetLastError ();
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| 256 |
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| 257 | return 0;
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[611] | 258 | }
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| 259 |
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| 260 |
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[2286] | 261 | int AnswerListeningSocket(SOCKET ServerSocket, SOCKET &ClientSocket,
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| 262 | SOCKADDR_IN &ClientSockAddr, int AddrLen) {
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| 263 | if (d_WSAIsBlocking()) {
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| 264 | log_message("rejected connect due blocking\n");
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| 265 | return -1;
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| 266 | }
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| 267 |
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| 268 | ClientSocket = d_accept(ServerSocket, (LPSOCKADDR) &ClientSockAddr, &AddrLen);
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| 269 | if (ClientSocket == INVALID_SOCKET) {
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| 270 | log_message("accept failed - connection lost\n");
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| 271 | return -1;
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| 272 | }
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| 273 |
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| 274 | log_message("accept success - connection made\n");
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| 275 | return 0;
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[611] | 276 | }
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| 277 |
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| 278 | void DestroyListeningSocket(SOCKET &ServerSocket, HWND MsgWindow) {
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[2286] | 279 | //Remove any message notification
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| 280 | d_WSAAsyncSelect(ServerSocket, MsgWindow, 0, 0);
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| 281 |
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| 282 | //Close the socket
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| 283 | CloseSocket(ServerSocket);
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[611] | 284 | }
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| 285 |
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| 286 | void CloseSocket(SOCKET &TargetSocket) {
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[2286] | 287 | if (TargetSocket != INVALID_SOCKET) {
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| 288 | //Since we're closing the socket, there's not much I can do about errors
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| 289 | //now so I'm not gonna bother checking...
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| 290 |
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| 291 | //Shutdown both ends, assume we have all data...
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| 292 | d_shutdown(TargetSocket, 2);
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| 293 |
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| 294 | d_closesocket(TargetSocket);
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| 295 |
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| 296 | //Make sure we can't use the old handle again...
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| 297 | TargetSocket = INVALID_SOCKET;
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| 298 | }
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[611] | 299 | }
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| 300 |
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| 301 | int GetData(SOCKET ClientSocket, BYTE *IOBuffer, int IOBufferSize,
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[2286] | 302 | int ThreadNum) {
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| 303 |
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| 304 | int NumRecv;
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| 305 | int Error;
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| 306 | struct timeval Timeout;
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| 307 | fd_set SocketSet;
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| 308 |
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| 309 | //Set up a socket set structure with just ClientSocket for select(..)
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| 310 | FD_ZERO(&SocketSet);
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| 311 | FD_SET(ClientSocket, &SocketSet);
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| 312 |
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| 313 | //set timeout
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| 314 | Timeout.tv_sec = NETIO_CONN_TIMEOUT;
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| 315 | Timeout.tv_usec = 0;
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| 316 |
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| 317 | do {
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| 318 | NumRecv = d_recv(ClientSocket, (char *) IOBuffer, IOBufferSize, 0);
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| 319 | if (NumRecv == 0) {
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| 320 | //Lost connect
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| 321 | return -1;
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| 322 |
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| 323 | } else if (NumRecv == SOCKET_ERROR) {
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| 324 | Error = d_WSAGetLastError();
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| 325 | if (Error == WSAEWOULDBLOCK) {
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| 326 | NumRecv = 0;
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| 327 | //Wait for socket to be readable
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| 328 | if (d_select(0, &SocketSet, NULL, NULL, &Timeout) != 1) {
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| 329 | //Timeout
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| 330 | return -1;
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| 331 | }
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| 332 |
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| 333 | } else {
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| 334 | //Assume connection terminated
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| 335 | return -1;
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| 336 | }
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| 337 | }
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| 338 | } while(NumRecv == 0);
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| 339 | return NumRecv;
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[611] | 340 | }
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| 341 |
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[3810] | 342 | int GetLine(text_t &OutStr, SOCKET ClientSocket, BYTE *IOBuffer, int IOBufferSize,
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[2286] | 343 | int &BufferIndex, int &DataInBuffer, int ThreadNum) {
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[3810] | 344 |
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| 345 | OutStr.clear();
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[2286] | 346 | char CurChar;
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| 347 |
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| 348 | do {
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| 349 | if (BufferIndex == DataInBuffer) { //Need more data
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| 350 | DataInBuffer = GetData(ClientSocket, IOBuffer, IOBufferSize, ThreadNum);
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| 351 | if (DataInBuffer == -1) {
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| 352 | //Lost connect
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| 353 | return -1;
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| 354 | }
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| 355 | BufferIndex = 0;
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| 356 | }
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| 357 | CurChar = IOBuffer[BufferIndex];
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[9598] | 358 | ++BufferIndex;
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[2286] | 359 | if ((CurChar != 10) && (CurChar != 13)) {
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[3810] | 360 | OutStr.push_back(CurChar);
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[2286] | 361 | }
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[3810] | 362 | } while (CurChar != 10);
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[2286] | 363 |
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| 364 | return 0;
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[611] | 365 | }
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| 366 |
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| 367 | int SendData(SOCKET ClientSocket, BYTE *SendBuffer, int NumToSend,
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[2286] | 368 | int ThreadNum) {
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| 369 |
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| 370 | int NumSent = 0;
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| 371 | int Error;
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| 372 | struct timeval Timeout;
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| 373 | fd_set SocketSet;
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| 374 |
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| 375 | char NumSentStr[50];
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| 376 | itoa(NumToSend, NumSentStr, 10);
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| 377 |
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| 378 | //Set up a socket set structure with just ClientSocket for select(..)
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| 379 | FD_ZERO(&SocketSet);
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| 380 | FD_SET(ClientSocket, &SocketSet);
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| 381 | //set timeout
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| 382 | Timeout.tv_sec = NETIO_CONN_TIMEOUT;
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| 383 | Timeout.tv_usec = 0;
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| 384 |
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| 385 | while (NumToSend > 0) {
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| 386 | NumSent = d_send(ClientSocket, (char *) SendBuffer + NumSent, NumToSend, 0);
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| 387 | if (NumSent == 0) {
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| 388 | //Lost connect
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| 389 | return -1;
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| 390 | }
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| 391 | else if (NumSent == SOCKET_ERROR) {
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| 392 | Error = d_WSAGetLastError();
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| 393 | if (Error == WSAEWOULDBLOCK) {
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| 394 | NumSent = 0;
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| 395 | if (d_select(0, NULL, &SocketSet, NULL, &Timeout) != 1) {
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| 396 | //Timeout
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| 397 | return -1;
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[611] | 398 | }
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[2286] | 399 | }
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| 400 | else {
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| 401 | //Lost Connection
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| 402 | return -1;
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| 403 | }
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| 404 | }
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| 405 | NumToSend -= NumSent;
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| 406 | }
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| 407 | return 0;
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[611] | 408 | }
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| 409 |
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| 410 |
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| 411 | /******************************************************************************/
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| 412 | //Private Functions
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| 413 | /******************************************************************************/
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| 414 | /*-----------------------------------------------------------
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| 415 | * Function: GetHostID()
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| 416 | *
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| 417 | * Description:
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| 418 | * Get the Local IP address using the following algorithm:
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| 419 | * - get local hostname with gethostname()
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| 420 | * - attempt to resolve local hostname with gethostbyname()
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| 421 | * if that fails:
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| 422 | * - get a UDP socket
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| 423 | * - connect UDP socket to arbitrary address and port
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| 424 | * - use getsockname() to get local address
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| 425 | *
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| 426 | * Notes: Copyright by Bob Quinn, 1995, taken from his Winsock library
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| 427 | * was removed from its original module unmodified
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| 428 | */
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| 429 | DWORD GetHostID () {
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[2286] | 430 | char szLclHost [MAXHOSTNAME];
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| 431 | LPHOSTENT lpstHostent;
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| 432 | SOCKADDR_IN stLclAddr;
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| 433 | SOCKADDR_IN stRmtAddr;
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| 434 | int nAddrSize = sizeof(SOCKADDR);
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| 435 | SOCKET hSock;
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| 436 | int nRet;
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| 437 |
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| 438 | /* Init local address (to zero) */
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| 439 | stLclAddr.sin_addr.s_addr = INADDR_ANY;
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| 440 |
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| 441 | /* Get the local hostname */
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| 442 | nRet = d_gethostname(szLclHost, MAXHOSTNAME);
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| 443 | if (nRet != SOCKET_ERROR) {
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| 444 | /* Resolve hostname for local address */
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| 445 | lpstHostent = d_gethostbyname((LPSTR)szLclHost);
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| 446 | if (lpstHostent)
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| 447 | stLclAddr.sin_addr.s_addr = *((u_long FAR*) (lpstHostent->h_addr));
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| 448 | }
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| 449 |
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| 450 | /* If still not resolved, then try second strategy */
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| 451 | if (stLclAddr.sin_addr.s_addr == INADDR_ANY) {
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| 452 | /* Get a UDP socket */
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| 453 | hSock = d_socket(AF_INET, SOCK_DGRAM, 0);
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| 454 | if (hSock != INVALID_SOCKET) {
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| 455 | /* Connect to arbitrary port and address (NOT loopback) */
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| 456 | stRmtAddr.sin_family = AF_INET;
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| 457 | stRmtAddr.sin_port = d_htons(IPPORT_ECHO);
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| 458 | stRmtAddr.sin_addr.s_addr = d_inet_addr("128.127.50.1");
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| 459 | nRet = d_connect(hSock,
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| 460 | (LPSOCKADDR)&stRmtAddr,
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| 461 | sizeof(SOCKADDR));
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| 462 | if (nRet != SOCKET_ERROR) {
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| 463 | /* Get local address */
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| 464 | d_getsockname(hSock,
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| 465 | (LPSOCKADDR)&stLclAddr,
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| 466 | (int FAR*)&nAddrSize);
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| 467 | }
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| 468 | d_closesocket(hSock); /* we're done with the socket */
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| 469 | }
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| 470 | }
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| 471 | return (stLclAddr.sin_addr.s_addr);
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[611] | 472 | }
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