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/* ============================================================================ |
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* Douglas Thrift's Search Engine License |
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* |
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* Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved. |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright notice, |
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* this list of conditions and the following disclaimer in the documentation |
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* and/or other materials provided with the distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, if any, must |
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* include the following acknowledgment: |
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* |
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* "This product includes software developed by Douglas Thrift |
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* (http://computers.douglasthrift.net/searchengine/)." |
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* |
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* Alternately, this acknowledgment may appear in the software itself, if |
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* and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Douglas Thrift" and "Douglas Thrift's Search Engine" must not |
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* be used to endorse or promote products derived from this software without |
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* specific prior written permission. For written permission, please visit |
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* http://www.douglasthrift.net/contact.cgi for contact information. |
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* |
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* 5. Products derived from this software may not be called "Douglas Thrift's |
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* Search Engine", nor may "Douglas Thrift's Search Engine" appear in their |
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* name, without prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, |
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* ============================================================================ |
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*/ |
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// Douglas Thrift's Search Engine HTTP Handler |
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// |
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// Douglas Thrift |
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// |
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// HttpHandler.cpp |
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|
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#include "HttpHandler.h" |
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|
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// Lovely C Sockets! |
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#ifndef _WIN32 |
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// BSD Sockets |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netdb.h> |
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|
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#define INVALID_SOCKET -1 |
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#define SOCKET_ERROR -1 |
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|
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inline int closesocket(SOCKET s) { return close(s); } |
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#endif |
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|
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HttpHandler::HttpHandler() |
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{ |
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buffer = new char[BUFSIZ + 1]; |
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|
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#ifdef _WIN32 |
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if (WSAStartup(MAKEWORD(2, 0), &data) != 0) |
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{ |
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error(program + ": WSAStartup"); |
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exit(1); |
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} |
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#endif // _WIN32 |
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|
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length = 0; |
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chunked = false; |
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} |
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|
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HttpHandler::~HttpHandler() |
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{ |
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delete [] buffer; |
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|
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#ifdef _WIN32 |
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WSACleanup(); |
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#endif // _WIN32 |
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} |
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|
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bool HttpHandler::handle(URL &url, const string referer, bool head) |
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{ |
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bool answer = false; |
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|
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if ((http = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) |
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{ |
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error(program + ": Socket"); |
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exit(1); |
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} |
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|
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sockaddr_in address; |
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hostent* host; |
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|
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address.sin_family = AF_INET; |
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|
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if ((host = gethostbyname(url.getAddress().c_str())) == NULL) |
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{ |
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error(program + ": Host: " + url.getAddress(), true); |
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return answer; |
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} |
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|
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address.sin_addr = *((in_addr*)*host->h_addr_list); |
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address.sin_port = htons(url.getPort()); |
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|
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if (connect(http, (sockaddr*)&address, sizeof(sockaddr_in)) == |
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SOCKET_ERROR) |
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{ |
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error(program + ": Connect"); |
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return answer; |
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} |
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|
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if (head) |
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{ |
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putline("HEAD " + url.getPath() + " HTTP/1.1"); |
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} |
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else |
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{ |
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putline("GET " + url.getPath() + " HTTP/1.1"); |
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} |
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|
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putline("Accept: text/html; text/plain"); |
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putline("User-Agent: " + agent(true) + ' ' + platform()); |
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|
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if (url.getPort() == 80) |
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{ |
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putline("Host: " + url.getAddress()); |
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} |
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else |
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{ |
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char* port = new char[1024]; |
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sprintf(port, "%u", url.getPort()); |
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|
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putline("Host: " + url.getAddress() + ':' + port); |
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|
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delete [] port; |
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} |
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|
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if (referer != "") |
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{ |
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putline("Referer: " + referer); |
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} |
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|
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putline("Connection: close"); |
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putline(); |
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|
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code response; |
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string line; |
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|
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do |
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{ |
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line = getline(); |
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|
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if (line.find("HTTP/") != 0) |
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{ |
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return answer; |
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} |
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|
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unsigned dot = line.find('.'); |
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unsigned space = line.find(' '); |
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|
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unsigned major = strtoul(line.substr(5, dot - 5).c_str(), 0, 10); |
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unsigned minor = strtoul(line.substr(dot + 1, space - dot - 1).c_str(), |
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0, 10); |
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|
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if (major > 1) |
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{ |
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cerr << program << ": Potentially Incompatible Server: HTTP/" << |
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major << "." << minor << "\n"; |
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|
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return answer; |
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} |
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|
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response = code(strtoul(line.substr(space + 1).c_str(), 0, 10)); |
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|
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if (response < ok) do line = getline(); while (line != ""); |
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} |
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while (response < ok); |
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|
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do |
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{ |
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line = getline(); |
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|
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if (line != "") |
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{ |
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unsigned colon = line.find(':'); |
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|
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string field = line.substr(0, colon); |
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string value = line.substr(colon + 1); |
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|
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while (isspace(value[0])) value.erase(0, 1); |
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|
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if (field == "Content-Type") |
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{ |
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type = value; |
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} |
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else if (field == "Content-Length") |
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{ |
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length = strtoul(value.c_str(), 0, 10); |
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} |
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else if (field == "Location") |
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{ |
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location = value; |
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} |
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else if (field == "Transfer-Encoding") |
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{ |
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chunked = value == "chunked"; |
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} |
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} |
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} |
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while (line != ""); |
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|
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switch (response) |
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{ |
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case ok: |
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if (debug) cerr << "response = " << response << "\n"; |
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answer = true; |
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break; |
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case choices: |
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case moved: |
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case found: |
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if (debug) cerr << "response = " << response << "\n" |
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<< "location = " << location << "\n"; |
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location = getLink(location, url); |
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break; |
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case notfound: |
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case internal: |
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if (debug) cerr << "response = " << response << "\n"; |
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break; |
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default: |
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if (debug) cerr << "response = " << response << "\n"; |
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if (response <= 299) |
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{ |
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answer = true; |
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} |
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else if (response <= 399) |
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{ |
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location = getLink(location, url); |
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} |
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break; |
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} |
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|
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if (!head && answer) populate(); |
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|
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return answer; |
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} |
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|
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HttpHandler& HttpHandler::getline(string& line, char endline) |
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{ |
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unsigned end = page.find(endline); |
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unsigned newline = page.find('\n'); |
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|
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if (newline < end || end == string::npos) |
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{ |
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end = newline; |
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} |
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|
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line = page.substr(0, end); |
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page.erase(0, (end == string::npos ? end : end + 1)); |
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|
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return *this; |
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} |
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|
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void HttpHandler::clear() |
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{ |
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closesocket(http); |
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|
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type = ""; |
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length = 0; |
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location = ""; |
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page = ""; |
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chunked = false; |
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} |
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|
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void HttpHandler::populate() |
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{ |
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if (!chunked) |
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{ |
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unsigned left = length; |
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|
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while (left > 0) |
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{ |
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memset(buffer, 0, BUFSIZ + 1); |
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|
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unsigned bytes = left > BUFSIZ ? BUFSIZ : left; |
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unsigned received; |
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|
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while (true) |
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{ |
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if ((received = recv(http, buffer, bytes, 0)) == SOCKET_ERROR) |
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{ |
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error(program + ": Recv"); |
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exit(1); |
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} |
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else if (received != bytes) |
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{ |
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left -= received; |
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page += buffer; |
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|
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memset(buffer, 0, BUFSIZ + 1); |
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|
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bytes -= received; |
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} |
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else |
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{ |
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break; |
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} |
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} |
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|
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page += buffer; |
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left -= bytes; |
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} |
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} |
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else |
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{ |
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unsigned chunk; |
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|
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do |
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{ |
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chunk = strtoul(getline().c_str(), 0, 16); |
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|
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unsigned left = chunk; |
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|
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while (left > 0) |
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{ |
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memset(buffer, 0, BUFSIZ + 1); |
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|
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unsigned bytes = left > BUFSIZ ? BUFSIZ : left; |
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unsigned received; |
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|
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while (true) |
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{ |
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if ((received = recv(http, buffer, bytes, 0)) == |
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SOCKET_ERROR) |
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{ |
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error(program + ": Recv"); |
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exit(1); |
| 349 |
} |
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else if (received != bytes) |
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{ |
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left -= received; |
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page += buffer; |
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|
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memset(buffer, 0, BUFSIZ + 1); |
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|
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bytes -= received; |
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} |
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else |
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{ |
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break; |
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} |
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} |
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|
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page += buffer; |
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left -= bytes; |
| 367 |
} |
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|
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getline(); |
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length += chunk; |
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} |
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while (chunk > 0); |
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} |
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|
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for (unsigned index = 0; index < page.length(); index++) |
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{ |
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if (page[index] == '\r' && (index + 1 < page.length()) ? page[index + |
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1] == '\n' : false) |
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{ |
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page.erase(index, 1); |
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} |
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else if (page[index] == '\r') |
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{ |
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page[index] = '\n'; |
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} |
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} |
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} |
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|
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void HttpHandler::putline(const string line) |
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{ |
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sprintf(buffer, "%s\r\n", line.c_str()); |
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if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR) |
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{ |
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error(program + ": Send"); |
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exit(1); |
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} |
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} |
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|
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string HttpHandler::getline() |
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{ |
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string line; |
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char byte; |
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|
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do |
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{ |
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if (recv(http, &byte, 1, 0) == SOCKET_ERROR) |
| 407 |
{ |
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error(program + ": Recv"); |
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} |
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|
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if (byte != '\r' && byte != '\n') |
| 412 |
{ |
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line += byte; |
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} |
| 415 |
} |
| 416 |
while (byte != '\n'); |
| 417 |
|
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return line; |
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} |
| 420 |
|
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void HttpHandler::error(const string& prefix, bool host) |
| 422 |
{ |
| 423 |
#ifdef _WIN32 |
| 424 |
string error; |
| 425 |
|
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switch (WSAGetLastError()) |
| 427 |
{ |
| 428 |
case WSAEACCES: |
| 429 |
error = "Permission denied."; |
| 430 |
break; |
| 431 |
case WSAEADDRINUSE: |
| 432 |
error = "Address already in use."; |
| 433 |
break; |
| 434 |
case WSAEADDRNOTAVAIL: |
| 435 |
error = "Cannot assign requested address."; |
| 436 |
break; |
| 437 |
case WSAEAFNOSUPPORT: |
| 438 |
error = "Address family not supported by protocol family."; |
| 439 |
break; |
| 440 |
case WSAEALREADY: |
| 441 |
error = "Operation already in progress."; |
| 442 |
break; |
| 443 |
case WSAECONNABORTED: |
| 444 |
error = "Software caused connection abort."; |
| 445 |
break; |
| 446 |
case WSAECONNREFUSED: |
| 447 |
error = "Connection refused."; |
| 448 |
break; |
| 449 |
case WSAECONNRESET: |
| 450 |
error = "Connection reset by peer."; |
| 451 |
break; |
| 452 |
case WSAEDESTADDRREQ: |
| 453 |
error = "Destination address required."; |
| 454 |
break; |
| 455 |
case WSAEFAULT: |
| 456 |
error = "Bad address."; |
| 457 |
break; |
| 458 |
case WSAEHOSTDOWN: |
| 459 |
error = "Host is down."; |
| 460 |
break; |
| 461 |
case WSAEHOSTUNREACH: |
| 462 |
error = "No route to host."; |
| 463 |
break; |
| 464 |
case WSAEINPROGRESS: |
| 465 |
error = "Operation now in progress."; |
| 466 |
break; |
| 467 |
case WSAEINTR: |
| 468 |
error = "Interrupted function call."; |
| 469 |
break; |
| 470 |
case WSAEINVAL: |
| 471 |
error = "Invalid argument."; |
| 472 |
break; |
| 473 |
case WSAEISCONN: |
| 474 |
error = "Socket is already connected."; |
| 475 |
break; |
| 476 |
case WSAEMFILE: |
| 477 |
error = "Too many open files."; |
| 478 |
break; |
| 479 |
case WSAEMSGSIZE: |
| 480 |
error = "Message too long."; |
| 481 |
break; |
| 482 |
case WSAENETDOWN: |
| 483 |
error = "Network is down."; |
| 484 |
break; |
| 485 |
case WSAENETRESET: |
| 486 |
error = "Network dropped connection on reset."; |
| 487 |
break; |
| 488 |
case WSAENETUNREACH: |
| 489 |
error = "Network is unreachable."; |
| 490 |
break; |
| 491 |
case WSAENOBUFS: |
| 492 |
error = "No buffer space available."; |
| 493 |
break; |
| 494 |
case WSAENOPROTOOPT: |
| 495 |
error = "Bad protocol option."; |
| 496 |
break; |
| 497 |
case WSAENOTCONN: |
| 498 |
error = "Socket is not connected."; |
| 499 |
break; |
| 500 |
case WSAENOTSOCK: |
| 501 |
error = "Socket operation on non-socket."; |
| 502 |
break; |
| 503 |
case WSAEOPNOTSUPP: |
| 504 |
error = "Operation not supported."; |
| 505 |
break; |
| 506 |
case WSAEPFNOSUPPORT: |
| 507 |
error = "Protocol family not supported."; |
| 508 |
break; |
| 509 |
case WSAEPROCLIM: |
| 510 |
error = "Too many processes."; |
| 511 |
break; |
| 512 |
case WSAEPROTONOSUPPORT: |
| 513 |
error = "Protocol not supported."; |
| 514 |
break; |
| 515 |
case WSAEPROTOTYPE: |
| 516 |
error = "Protocol wrong type for socket."; |
| 517 |
break; |
| 518 |
case WSAESHUTDOWN: |
| 519 |
error = "Cannot send after socket shutdown."; |
| 520 |
break; |
| 521 |
case WSAESOCKTNOSUPPORT: |
| 522 |
error = "Socket type not supported."; |
| 523 |
break; |
| 524 |
case WSAETIMEDOUT: |
| 525 |
error = "Connection timed out."; |
| 526 |
break; |
| 527 |
case WSATYPE_NOT_FOUND: |
| 528 |
error = "Class type not found."; |
| 529 |
break; |
| 530 |
case WSAEWOULDBLOCK: |
| 531 |
error = "Resource temporarily unavailable."; |
| 532 |
break; |
| 533 |
case WSAHOST_NOT_FOUND: |
| 534 |
error = "Host not found."; |
| 535 |
break; |
| 536 |
case WSA_INVALID_HANDLE: |
| 537 |
error = "Specified event object handle is invalid."; |
| 538 |
break; |
| 539 |
case WSA_INVALID_PARAMETER: |
| 540 |
error = "One or more parameters are invalid."; |
| 541 |
break; |
| 542 |
// case WSAINVALIDPROCTABLE: |
| 543 |
// error = "Invalid procedure table from service provider."; |
| 544 |
// break; |
| 545 |
// case WSAINVALIDPROVIDER: |
| 546 |
// error = "Invalid service provider version number."; |
| 547 |
// break; |
| 548 |
case WSA_IO_INCOMPLETE: |
| 549 |
error = "Overlapped I/O event object not in signaled state."; |
| 550 |
break; |
| 551 |
case WSA_IO_PENDING: |
| 552 |
error = "Overlapped operations will complete later."; |
| 553 |
break; |
| 554 |
case WSA_NOT_ENOUGH_MEMORY: |
| 555 |
error = "Insufficient memory available."; |
| 556 |
break; |
| 557 |
case WSANOTINITIALISED: |
| 558 |
error = "Successful WSAStartup not yet performed."; |
| 559 |
break; |
| 560 |
case WSANO_DATA: |
| 561 |
error = "Valid name, no data record of requested type."; |
| 562 |
break; |
| 563 |
case WSANO_RECOVERY: |
| 564 |
error = "This is a non-recoverable error."; |
| 565 |
break; |
| 566 |
// case WSAPROVIDERFAILEDINIT: |
| 567 |
// error = "Unable to initialize a service provider."; |
| 568 |
// break; |
| 569 |
case WSASYSCALLFAILURE: |
| 570 |
error = "System call failure."; |
| 571 |
break; |
| 572 |
case WSASYSNOTREADY: |
| 573 |
error = "Network subsystem is unavailable."; |
| 574 |
break; |
| 575 |
case WSATRY_AGAIN: |
| 576 |
error = "Non-authoritative host not found."; |
| 577 |
break; |
| 578 |
case WSAVERNOTSUPPORTED: |
| 579 |
error = "WINSOCK.DLL version out of range."; |
| 580 |
break; |
| 581 |
case WSAEDISCON: |
| 582 |
error = "Graceful shutdown in progress."; |
| 583 |
break; |
| 584 |
case WSA_OPERATION_ABORTED: |
| 585 |
error = "Overlapped operation aborted."; |
| 586 |
break; |
| 587 |
default: |
| 588 |
error = "Unknown error."; |
| 589 |
break; |
| 590 |
} |
| 591 |
|
| 592 |
cerr << prefix << ": " << error << "\n"; |
| 593 |
#else |
| 594 |
if (host) |
| 595 |
{ |
| 596 |
string error; |
| 597 |
|
| 598 |
switch (h_errno) |
| 599 |
{ |
| 600 |
case HOST_NOT_FOUND: |
| 601 |
error = "Unknown host"; |
| 602 |
break; |
| 603 |
case TRY_AGAIN: |
| 604 |
error = "Host name lookup failure"; |
| 605 |
break; |
| 606 |
case NO_RECOVERY: |
| 607 |
error = "Unknown server error"; |
| 608 |
break; |
| 609 |
case NO_DATA: |
| 610 |
error = "No address associated with name"; |
| 611 |
break; |
| 612 |
default: |
| 613 |
error = "Unknown error"; |
| 614 |
break; |
| 615 |
} |
| 616 |
|
| 617 |
cerr << prefix << ": " << error << "\n"; |
| 618 |
} |
| 619 |
else |
| 620 |
{ |
| 621 |
perror(prefix.c_str()); |
| 622 |
} |
| 623 |
#endif // _WIN32 |
| 624 |
} |
