trunk/Search/HttpHandler.cpp

/* ============================================================================
 * Douglas Thrift's Search Engine License
 *
 * Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The end-user documentation included with the redistribution, if any, must
 *    include the following acknowledgment:
 *
 *       "This product includes software developed by Douglas Thrift
 *       (http://computers.douglasthrift.net/searchengine/)."
 *
 *    Alternately, this acknowledgment may appear in the software itself, if
 *    and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Douglas Thrift" and "Douglas Thrift's Search Engine" must not
 *    be used to endorse or promote products derived from this software without
 *    specific prior written permission.  For written permission, please visit
 *    http://www.douglasthrift.net/contact.cgi for contact information.
 *
 * 5. Products derived from this software may not be called "Douglas Thrift's
 *    Search Engine", nor may "Douglas Thrift's Search Engine" appear in their
 *    name, without prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * ============================================================================
 */
// Douglas Thrift's Search Engine HTTP Handler
//
// Douglas Thrift
//
// $Id: HttpHandler.cpp,v 1.24 2003/07/20 04:07:54 douglas Exp $

#include "HttpHandler.h"

// Lovely C Sockets!
#ifndef _WIN32
// BSD Sockets
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

inline int closesocket(SOCKET s) { return close(s); }
#endif

HttpHandler::HttpHandler()
{
        buffer = new char[BUFSIZ + 1];

#ifdef _WIN32
        if (WSAStartup(MAKEWORD(2, 0), &data) != 0)
        {
                error(program + ": WSAStartup");
                exit(1);
        }
#endif // _WIN32

        binary = false;
        length = 0;
        chunked = false;
#ifdef _OpenSSL_
        tls = false;
#endif
}

HttpHandler::~HttpHandler()
{
        delete [] buffer;

#ifdef _WIN32
        WSACleanup();
#endif // _WIN32
}

bool HttpHandler::handle(URL &url, const string referer, bool head)
{
        bool answer = false;

        if ((http = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
        {
                error(program + ": Socket");
                exit(1);
        }

        sockaddr_in address;
        hostent* host;

        address.sin_family = AF_INET;

        if ((host = gethostbyname(url.getAddress().c_str())) == NULL)
        {
                error(program + ": Host: " + url.getAddress(), true);
                return answer;
        }

        address.sin_addr = *((in_addr*)*host->h_addr_list);
        address.sin_port = htons(url.getPort());

        if (connect(http, (sockaddr*)&address, sizeof(sockaddr_in)) ==
                SOCKET_ERROR)
        {
                error(program + ": Connect");
                return answer;
        }

#ifdef _OpenSSL_
        if (url.getTls())
        {
                tls = true;

                if (!starttls()) return answer;
        }
#endif

        if (head)
        {
                putline("HEAD " + url.getPath() + " HTTP/1.1");
        }
        else
        {
                putline("GET " + url.getPath() + " HTTP/1.1");
        }

        putline("Accept: text/html; text/plain");
#ifndef _OpenSSL_
        putline("User-Agent: " + agent(true) + ' ' + platform());

        if (url.getPort() == 80)
#else
        putline("User-Agent: " + agent(true) + ' ' + platform() + ' '
                + openssl(true));

        if (url.getPort() == 80 && tls || url.getPort() == 443 && tls)
#endif
        {
                putline("Host: " + url.getAddress());
        }
        else
        {
                ostringstream port;

                port << url.getPort();

                putline("Host: " + url.getAddress() + ':' + port.str());
        }

        if (referer != "")
        {
                putline("Referer: " + referer);
        }

        putline("Connection: close");
        putline();

        code response;
        string line;

        do
        {
                line = getline();

                if (line.find("HTTP/") != 0)
                {
                        return answer;
                }

                unsigned dot = line.find('.');
                unsigned space = line.find(' ');

                unsigned major;
                unsigned minor;

                istringstream number(line.substr(5, dot - 5) + " " + line.substr(dot
                        + 1, space - dot - 1));

                number >> major;
                number >> minor;

                if (major > 1)
                {
                        cerr << program << ": Potentially Incompatible Server: HTTP/" <<
                                major << "." << minor << "\n";

                        return answer;
                }

                number.clear();
                number.str(line.substr(space + 1, 3));
                number >> response;

                if (response < ok) do line = getline(); while (line != "");
        }
        while (response < ok);

        do
        {
                line = getline();

                if (line != "")
                {
                        unsigned colon = line.find(':');

                        string field = line.substr(0, colon);
                        string value = line.substr(colon + 1);

                        while (isspace(value[0])) value.erase(0, 1);

                        if (field == "Content-Type")
                        {
                                type = value;
                        }
                        else if (field == "Content-Length")
                        {
                                istringstream number(value);

                                number >> length;
                        }
                        else if (field == "Location")
                        {
                                location = value;
                        }
                        else if (field == "Transfer-Encoding")
                        {
                                chunked = value == "chunked";
                        }
                }
        }
        while (line != "");

        switch (response)
        {
        case ok:
                if (debug) cerr << "response = " << response << "\n";
                answer = true;
                break;
        case choices:
        case moved:
        case found:
                if (debug) cerr << "response = " << response << "\n"
                        << "location = " << location << "\n";
                location = getLink(location, url);
                break;
        case notfound:
        case internal:
                if (debug) cerr << "response = " << response << "\n";
                break;
        default:
                if (debug) cerr << "response = " << response << "\n";
                if (response <= 299)
                {
                        answer = true;
                }
                else if (response <= 399)
                {
                        location = getLink(location, url);
                }
                break;
        }

        if (!head && answer) populate();

        return answer;
}

void HttpHandler::clear()
{
        if (tls)
        {
                SSL_shutdown(ssl);
                SSL_free(ssl);
                SSL_CTX_free(ctx);
        }

        closesocket(http);

        type = "";
        length = 0;
        location = "";
        page.clear();
        page.str("");
        chunked = false;
#ifdef _OpenSSL_
        tls = false;
#endif
}

void HttpHandler::populate()
{
        if (!chunked)
        {
                unsigned left = length;

                while (left > 0)
                {
                        memset(buffer, 0, BUFSIZ + 1);

                        unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
                        long received;

                        while (true)
                        {
#ifndef _OpenSSL_
                                if ((received = recv(http, buffer, bytes, 0)) == SOCKET_ERROR)
                                {
                                        error(program + ": Recv");
                                        exit(1);
                                }
#else
                                if ((received = !tls ? recv(http, buffer, bytes, 0) :
                                        SSL_read(ssl, buffer, bytes)) <= 0)
                                {
                                        !tls ? error(program + ": Recv") : error(program +
                                                ": SSL Read", int(received));
                                }
#endif
                                else if (received != bytes)
                                {
                                        left -= received;
                                        page << buffer;

                                        memset(buffer, 0, BUFSIZ + 1);

                                        bytes -= received;
                                }
                                else
                                {
                                        break;
                                }
                        }

                        page << buffer;
                        left -= bytes;
                }
        }
        else
        {
                unsigned chunk;

                do
                {
                        istringstream number(getline());

                        number.setf(ios_base::hex, ios_base::basefield);
                        number >> chunk;

                        unsigned left = chunk;

                        while (left > 0)
                        {
                                memset(buffer, 0, BUFSIZ + 1);

                                unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
                                long received;

                                while (true)
                                {
#ifndef _OpenSSL_
                                        if ((received = recv(http, buffer, bytes, 0)) ==
                                                SOCKET_ERROR)
                                        {
                                                error(program + ": Recv");
                                                exit(1);
                                        }
#else
                                        if ((received = !tls ? recv(http, buffer, bytes, 0) :
                                                SSL_read(ssl, buffer, bytes)) <= 0)
                                        {
                                                !tls ? error(program + ": Recv") : error(program +
                                                        ": SSL Read", int(received));
                                                exit(1);
                                        }
#endif
                                        else if (received != bytes)
                                        {
                                                left -= received;
                                                page << buffer;

                                                memset(buffer, 0, BUFSIZ + 1);

                                                bytes -= received;
                                        }
                                        else
                                        {
                                                break;
                                        }
                                }

                                page << buffer;
                                left -= bytes;
                        }

                        getline();
                        length += chunk;
                }
                while (chunk > 0);
        }

        if (!binary)
        {
                string page = this->page.str();

                for (unsigned index = 0; index < page.length(); index++)
                {
                        if (page[index] == '\r' && (index + 1 < page.length()) ? page[index +
                                1] == '\n' : false)
                        {
                                page.erase(index, 1);
                        }
                        else if (page[index] == '\r')
                        {
                                page[index] = '\n';
                        }
                }

                this->page.str(page);
        }
}

void HttpHandler::putline(const string line)
{
        sprintf(buffer, "%s\r\n", line.c_str());

#ifndef _OpenSSL_
        if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
        {
                error(program + ": Send");
                exit(1);
        }
#else
        if (!tls)
        {
                if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
                {
                        error(program + ": Send");
                        exit(1);
                }
        }
        else
        {
                int number;

                if ((number = SSL_write(ssl, buffer, strlen(buffer))) <= 0)
                {
                        error(program + ": SSL Write", number);
                        exit(1);
                }
        }
#endif
}

string HttpHandler::getline()
{
        string line;
        char byte;

        do
        {
#ifndef _OpenSSL_
                if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
                {
                        error(program + ": Recv");
                }
#else
                if (!tls)
                {
                        if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
                        {
                                error(program + ": Recv");
                        }
                }
                else
                {
                        int number;

                        if ((number = SSL_read(ssl, &byte, 1)) <= 0)
                        {
                                error(program + ": SSL Read", number);
                        }
                }
#endif

                if (byte != '\r' && byte != '\n')
                {
                        line += byte;
                }
        }
        while (byte != '\n');

        return line;
}

void HttpHandler::error(const string& prefix, bool host)
{
#ifdef _WIN32
        string error;

        switch (WSAGetLastError())
        {
        case WSAEACCES:
                error = "Permission denied";
                break;
        case WSAEADDRINUSE:
                error = "Address already in use";
                break;
        case WSAEADDRNOTAVAIL:
                error = "Cannot assign requested address";
                break;
        case WSAEAFNOSUPPORT:
                error = "Address family not supported by protocol family";
                break;
        case WSAEALREADY:
                error = "Operation already in progress";
                break;
        case WSAECONNABORTED:
                error = "Software caused connection abort";
                break;
        case WSAECONNREFUSED:
                error = "Connection refused";
                break;
        case WSAECONNRESET:
                error = "Connection reset by peer";
                break;
        case WSAEDESTADDRREQ:
                error = "Destination address required";
                break;
        case WSAEFAULT:
                error = "Bad address";
                break;
        case WSAEHOSTDOWN:
                error = "Host is down";
                break;
        case WSAEHOSTUNREACH:
                error = "No route to host";
                break;
        case WSAEINPROGRESS:
                error = "Operation now in progress";
                break;
        case WSAEINTR:
                error = "Interrupted function call";
                break;
        case WSAEINVAL:
                error = "Invalid argument";
                break;
        case WSAEISCONN:
                error = "Socket is already connected";
                break;
        case WSAEMFILE:
                error = "Too many open files";
                break;
        case WSAEMSGSIZE:
                error = "Message too long";
                break;
        case WSAENETDOWN:
                error = "Network is down";
                break;
        case WSAENETRESET:
                error = "Network dropped connection on reset";
                break;
        case WSAENETUNREACH:
                error = "Network is unreachable";
                break;
        case WSAENOBUFS:
                error = "No buffer space available";
                break;
        case WSAENOPROTOOPT:
                error = "Bad protocol option";
                break;
        case WSAENOTCONN:
                error = "Socket is not connected";
                break;
        case WSAENOTSOCK:
                error = "Socket operation on non-socket";
                break;
        case WSAEOPNOTSUPP:
                error = "Operation not supported";
                break;
        case WSAEPFNOSUPPORT:
                error = "Protocol family not supported";
                break;
        case WSAEPROCLIM:
                error = "Too many processes";
                break;
        case WSAEPROTONOSUPPORT:
                error = "Protocol not supported";
                break;
        case WSAEPROTOTYPE:
                error = "Protocol wrong type for socket";
                break;
        case WSAESHUTDOWN:
                error = "Cannot send after socket shutdown";
                break;
        case WSAESOCKTNOSUPPORT:
                error = "Socket type not supported";
                break;
        case WSAETIMEDOUT:
                error = "Connection timed out";
                break;
        case WSATYPE_NOT_FOUND:
                error = "Class type not found";
                break;
        case WSAEWOULDBLOCK:
                error = "Resource temporarily unavailable";
                break;
        case WSAHOST_NOT_FOUND:
                error = "Host not found";
                break;
        case WSA_INVALID_HANDLE:
                error = "Specified event object handle is invalid";
                break;
        case WSA_INVALID_PARAMETER:
                error = "One or more parameters are invalid";
                break;
//      case WSAINVALIDPROCTABLE:
//              error = "Invalid procedure table from service provider";
//              break;
//      case WSAINVALIDPROVIDER:
//              error = "Invalid service provider version number";
//              break;
        case WSA_IO_INCOMPLETE:
                error = "Overlapped I/O event object not in signaled state";
                break;
        case WSA_IO_PENDING:
                error = "Overlapped operations will complete later";
                break;
        case WSA_NOT_ENOUGH_MEMORY:
                error = "Insufficient memory available";
                break;
        case WSANOTINITIALISED:
                error = "Successful WSAStartup not yet performed";
                break;
        case WSANO_DATA:
                error = "Valid name, no data record of requested type";
                break;
        case WSANO_RECOVERY:
                error = "This is a non-recoverable error";
                break;
//      case WSAPROVIDERFAILEDINIT:
//              error = "Unable to initialize a service provider";
//              break;
        case WSASYSCALLFAILURE:
                error = "System call failure";
                break;
        case WSASYSNOTREADY:
                error = "Network subsystem is unavailable";
                break;
        case WSATRY_AGAIN:
                error = "Non-authoritative host not found";
                break;
        case WSAVERNOTSUPPORTED:
                error = "WINSOCK.DLL version out of range";
                break;
        case WSAEDISCON:
                error = "Graceful shutdown in progress";
                break;
        case WSA_OPERATION_ABORTED:
                error = "Overlapped operation aborted";
                break;
        default:
                error = "Unknown error";
                break;
        }

        cerr << prefix << ": " << error << "\n";
#else
        if (host)
        {
                string error;

                switch (h_errno)
                {
                case HOST_NOT_FOUND:
                        error = "Unknown host";
                        break;
                case TRY_AGAIN:
                        error = "Host name lookup failure";
                        break;
                case NO_RECOVERY:
                        error = "Unknown server error";
                        break;
                case NO_DATA:
                        error = "No address associated with name";
                        break;
                default:
                        error = "Unknown error";
                        break;
                }

                cerr << prefix << ": " << error << "\n";
        }
        else
        {
                perror(prefix.c_str());
        }
#endif // _WIN32
}

#ifdef _OpenSSL_
void HttpHandler::error(const string& prefix, int number)
{
        string error;

        switch (SSL_get_error(ssl, number))
        {
        case SSL_ERROR_NONE:
                error = "The TLS/SSL I/O operation completed";
                break;
        case SSL_ERROR_ZERO_RETURN:
                error = "The TLS/SSL connection has been closed";
                break;
        case SSL_ERROR_WANT_READ:
        case SSL_ERROR_WANT_WRITE:
        case SSL_ERROR_WANT_CONNECT:
//      case SSL_ERROR_WANT_ACCEPT:
        case SSL_ERROR_WANT_X509_LOOKUP:
                error = "The operation did not complete";
                break;
        case SSL_ERROR_SYSCALL:
                if (int err = ERR_get_error() != 0)
                {
                        error = ERR_reason_error_string(err);
                }
                else
                {
                        switch (number)
                        {
                        case 0:
                                error = "An EOF was observed that violates the protocol";
                                break;
                        case -1:
                                this->error(prefix);
                                return;
                        default:
                                error = "Unknown error";
                                break;
                        }
                }
                break;
        case SSL_ERROR_SSL:
                error = ERR_reason_error_string(ERR_get_error());
                break;
        default:
                error = "Unknown error";
                break;
        }

        cerr << prefix << ": " << error << "\n";
}

bool HttpHandler::starttls()
{
        SSL_load_error_strings();
        SSL_library_init();

#ifndef _urandomdev_
        int pid = getpid();
        int now = time(NULL);

        unsigned seed = now > pid ? now - pid : pid - now;

        char* junk = new char[seed % 30 + 2];
        junk[0] = pid;
        junk[seed % 30 + 1] = now;

        srand(seed);

        for (int index = 1; index < seed % 30 + 1; index++)
        {
                junk[index] = rand();
        }

        if (debug)
        {
                cerr << "junk = {\n";

                for (int index = 1; index < seed % 30 + 2; index++)
                {
                        cerr << "   [" << index << "] = " << int(junk[index]) << "\n";
                }

                cerr << "}\n";
        }

        RAND_seed(junk, seed % 30 + 2);

        delete junk;
#endif

        ctx = SSL_CTX_new(TLSv1_client_method());

        if (ctx == NULL)
        {
                cerr << program << ": SSL CTX New: "
                        << ERR_reason_error_string(ERR_get_error()) << "\n";
                return false;
        }

        ssl = SSL_new(ctx);

        if (SSL_set_fd(ssl, http) == 0)
        {
                cerr << program << ": SSL Set FD: "
                        << ERR_reason_error_string(ERR_get_error()) << "\n";
                return false;
        }

        int number;

        if ((number = SSL_connect(ssl)) <= 0)
        {
                error(program + ": SSL Connect", number);
                return false;
        }

        return true;
}
#endif
Revision:	213
Committed:	2003-07-19T21:07:54-07:00 (21 years, 11 months ago) by douglas
File size:	16783 byte(s)
Log Message:	Fixed >> for code in HttpHandler.
#	User	Rev	Content
1	douglas	1	/* ============================================================================
2			* Douglas Thrift's Search Engine License
3			*
4	douglas	28	* Copyright (C) 2002-2003, Douglas Thrift. All Rights Reserved.
5	douglas	1	* Redistribution and use in source and binary forms, with or without
6			* modification, are permitted provided that the following conditions are met:
7			*
8			* 1. Redistributions of source code must retain the above copyright notice,
9			* this list of conditions and the following disclaimer.
10			*
11			* 2. Redistributions in binary form must reproduce the above copyright notice,
12			* this list of conditions and the following disclaimer in the documentation
13			* and/or other materials provided with the distribution.
14			*
15			* 3. The end-user documentation included with the redistribution, if any, must
16			* include the following acknowledgment:
17			*
18			* "This product includes software developed by Douglas Thrift
19			* (http://computers.douglasthrift.net/searchengine/)."
20			*
21			* Alternately, this acknowledgment may appear in the software itself, if
22			* and wherever such third-party acknowledgments normally appear.
23			*
24			* 4. The names "Douglas Thrift" and "Douglas Thrift's Search Engine" must not
25			* be used to endorse or promote products derived from this software without
26			* specific prior written permission. For written permission, please visit
27			* http://www.douglasthrift.net/contact.cgi for contact information.
28			*
29			* 5. Products derived from this software may not be called "Douglas Thrift's
30			* Search Engine", nor may "Douglas Thrift's Search Engine" appear in their
31			* name, without prior written permission.
32			*
33			* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
34			* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
35			* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
36			* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
37			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
38			* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
39			* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
40			* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
41			* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
42			* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43			* ============================================================================
44			*/
45			// Douglas Thrift's Search Engine HTTP Handler
46			//
47			// Douglas Thrift
48			//
49	douglas	213	// $Id: HttpHandler.cpp,v 1.24 2003/07/20 04:07:54 douglas Exp $
50	douglas	1
51			#include "HttpHandler.h"
52
53	douglas	179	// Lovely C Sockets!
54	douglas	178	#ifndef _WIN32
55	douglas	179	// BSD Sockets
56	douglas	178	#include <unistd.h>
57			#include <sys/types.h>
58			#include <sys/socket.h>
59			#include <netinet/in.h>
60			#include <netdb.h>
61	douglas	212
62			inline int closesocket(SOCKET s) { return close(s); }
63	douglas	178	#endif
64
65	douglas	1	HttpHandler::HttpHandler()
66			{
67	douglas	14	buffer = new char[BUFSIZ + 1];
68
69	douglas	13	#ifdef _WIN32
70	douglas	14	if (WSAStartup(MAKEWORD(2, 0), &data) != 0)
71	douglas	13	{
72	douglas	17	error(program + ": WSAStartup");
73	douglas	13	exit(1);
74			}
75			#endif // _WIN32
76	douglas	1
77	douglas	208	binary = false;
78	douglas	18	length = 0;
79			chunked = false;
80	douglas	201	#ifdef _OpenSSL_
81			tls = false;
82			#endif
83	douglas	1	}
84
85			HttpHandler::~HttpHandler()
86			{
87	douglas	14	delete [] buffer;
88
89	douglas	13	#ifdef _WIN32
90			WSACleanup();
91			#endif // _WIN32
92	douglas	1	}
93
94	douglas	25	bool HttpHandler::handle(URL &url, const string referer, bool head)
95	douglas	1	{
96			bool answer = false;
97
98	douglas	14	if ((http = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
99			{
100			error(program + ": Socket");
101			exit(1);
102			}
103	douglas	1
104	douglas	14	sockaddr_in address;
105			hostent* host;
106	douglas	1
107	douglas	14	address.sin_family = AF_INET;
108	douglas	1
109	douglas	14	if ((host = gethostbyname(url.getAddress().c_str())) == NULL)
110			{
111			error(program + ": Host: " + url.getAddress(), true);
112			return answer;
113			}
114	douglas	1
115	douglas	14	address.sin_addr = ((in_addr)*host->h_addr_list);
116			address.sin_port = htons(url.getPort());
117
118			if (connect(http, (sockaddr*)&address, sizeof(sockaddr_in)) ==
119			SOCKET_ERROR)
120			{
121			error(program + ": Connect");
122			return answer;
123			}
124
125	douglas	208	#ifdef _OpenSSL_
126			if (url.getTls())
127			{
128			tls = true;
129
130			if (!starttls()) return answer;
131			}
132			#endif
133
134	douglas	14	if (head)
135			{
136			putline("HEAD " + url.getPath() + " HTTP/1.1");
137			}
138			else
139			{
140			putline("GET " + url.getPath() + " HTTP/1.1");
141			}
142
143			putline("Accept: text/html; text/plain");
144	douglas	201	#ifndef _OpenSSL_
145	douglas	14	putline("User-Agent: " + agent(true) + ' ' + platform());
146	douglas	208
147			if (url.getPort() == 80)
148	douglas	201	#else
149			putline("User-Agent: " + agent(true) + ' ' + platform() + ' '
150			+ openssl(true));
151	douglas	208
152			if (url.getPort() == 80 && tls \|\| url.getPort() == 443 && tls)
153	douglas	201	#endif
154	douglas	14	{
155			putline("Host: " + url.getAddress());
156			}
157			else
158			{
159	douglas	208	ostringstream port;
160	douglas	14
161	douglas	208	port << url.getPort();
162	douglas	14
163	douglas	208	putline("Host: " + url.getAddress() + ':' + port.str());
164	douglas	14	}
165
166	douglas	25	if (referer != "")
167			{
168			putline("Referer: " + referer);
169			}
170
171	douglas	18	putline("Connection: close");
172	douglas	14	putline();
173
174	douglas	18	code response;
175			string line;
176	douglas	17
177	douglas	18	do
178	douglas	17	{
179	douglas	18	line = getline();
180	douglas	17
181	douglas	18	if (line.find("HTTP/") != 0)
182			{
183			return answer;
184			}
185	douglas	17
186	douglas	18	unsigned dot = line.find('.');
187			unsigned space = line.find(' ');
188	douglas	17
189	douglas	212	unsigned major;
190			unsigned minor;
191	douglas	17
192	douglas	212	istringstream number(line.substr(5, dot - 5) + " " + line.substr(dot
193			+ 1, space - dot - 1));
194
195			number >> major;
196			number >> minor;
197
198	douglas	24	if (major > 1)
199	douglas	18	{
200	douglas	19	cerr << program << ": Potentially Incompatible Server: HTTP/" <<
201			major << "." << minor << "\n";
202	douglas	18
203			return answer;
204			}
205
206	douglas	212	number.clear();
207			number.str(line.substr(space + 1, 3));
208			number >> response;
209	douglas	18
210			if (response < ok) do line = getline(); while (line != "");
211	douglas	17	}
212	douglas	18	while (response < ok);
213	douglas	17
214			do
215			{
216			line = getline();
217	douglas	18
218			if (line != "")
219			{
220			unsigned colon = line.find(':');
221
222			string field = line.substr(0, colon);
223			string value = line.substr(colon + 1);
224
225			while (isspace(value[0])) value.erase(0, 1);
226
227	douglas	19	if (field == "Content-Type")
228			{
229			type = value;
230			}
231			else if (field == "Content-Length")
232			{
233	douglas	212	istringstream number(value);
234
235			number >> length;
236	douglas	19	}
237			else if (field == "Location")
238			{
239			location = value;
240			}
241			else if (field == "Transfer-Encoding")
242			{
243			chunked = value == "chunked";
244			}
245	douglas	18	}
246	douglas	17	}
247			while (line != "");
248
249			switch (response)
250			{
251			case ok:
252	douglas	18	if (debug) cerr << "response = " << response << "\n";
253	douglas	17	answer = true;
254			break;
255	douglas	18	case choices:
256	douglas	17	case moved:
257			case found:
258	douglas	18	if (debug) cerr << "response = " << response << "\n"
259			<< "location = " << location << "\n";
260			location = getLink(location, url);
261	douglas	17	break;
262			case notfound:
263			case internal:
264	douglas	18	if (debug) cerr << "response = " << response << "\n";
265	douglas	17	break;
266			default:
267	douglas	18	if (debug) cerr << "response = " << response << "\n";
268			if (response <= 299)
269			{
270			answer = true;
271			}
272			else if (response <= 399)
273			{
274			location = getLink(location, url);
275			}
276	douglas	17	break;
277			}
278
279	douglas	19	if (!head && answer) populate();
280
281	douglas	1	return answer;
282			}
283
284	douglas	208	void HttpHandler::clear()
285	douglas	1	{
286	douglas	208	if (tls)
287	douglas	1	{
288	douglas	208	SSL_shutdown(ssl);
289			SSL_free(ssl);
290			SSL_CTX_free(ctx);
291	douglas	1	}
292
293	douglas	18	closesocket(http);
294
295	douglas	17	type = "";
296			length = 0;
297			location = "";
298	douglas	208	page.clear();
299			page.str("");
300	douglas	18	chunked = false;
301	douglas	201	#ifdef _OpenSSL_
302			tls = false;
303			#endif
304	douglas	1	}
305
306	douglas	19	void HttpHandler::populate()
307			{
308			if (!chunked)
309			{
310			unsigned left = length;
311
312			while (left > 0)
313			{
314			memset(buffer, 0, BUFSIZ + 1);
315
316			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
317	douglas	208	long received;
318	douglas	19
319	douglas	145	while (true)
320	douglas	19	{
321	douglas	208	#ifndef _OpenSSL_
322	douglas	145	if ((received = recv(http, buffer, bytes, 0)) == SOCKET_ERROR)
323	douglas	24	{
324			error(program + ": Recv");
325			exit(1);
326			}
327	douglas	208	#else
328			if ((received = !tls ? recv(http, buffer, bytes, 0) :
329			SSL_read(ssl, buffer, bytes)) <= 0)
330			{
331			!tls ? error(program + ": Recv") : error(program +
332	douglas	209	": SSL Read", int(received));
333	douglas	208	}
334			#endif
335	douglas	145	else if (received != bytes)
336			{
337			left -= received;
338	douglas	208	page << buffer;
339	douglas	145
340			memset(buffer, 0, BUFSIZ + 1);
341
342			bytes -= received;
343			}
344			else
345			{
346			break;
347			}
348	douglas	24	}
349
350	douglas	208	page << buffer;
351	douglas	19	left -= bytes;
352			}
353			}
354			else
355			{
356	douglas	20	unsigned chunk;
357
358			do
359			{
360	douglas	212	istringstream number(getline());
361	douglas	20
362	douglas	212	number.setf(ios_base::hex, ios_base::basefield);
363			number >> chunk;
364
365	douglas	20	unsigned left = chunk;
366
367			while (left > 0)
368			{
369			memset(buffer, 0, BUFSIZ + 1);
370
371			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
372	douglas	208	long received;
373	douglas	20
374	douglas	145	while (true)
375	douglas	20	{
376	douglas	208	#ifndef _OpenSSL_
377	douglas	145	if ((received = recv(http, buffer, bytes, 0)) ==
378			SOCKET_ERROR)
379	douglas	24	{
380			error(program + ": Recv");
381			exit(1);
382			}
383	douglas	208	#else
384			if ((received = !tls ? recv(http, buffer, bytes, 0) :
385			SSL_read(ssl, buffer, bytes)) <= 0)
386			{
387			!tls ? error(program + ": Recv") : error(program +
388	douglas	209	": SSL Read", int(received));
389	douglas	208	exit(1);
390			}
391			#endif
392	douglas	145	else if (received != bytes)
393			{
394			left -= received;
395	douglas	208	page << buffer;
396	douglas	145
397			memset(buffer, 0, BUFSIZ + 1);
398
399			bytes -= received;
400			}
401			else
402			{
403			break;
404			}
405	douglas	24	}
406
407	douglas	208	page << buffer;
408	douglas	20	left -= bytes;
409			}
410
411			getline();
412			length += chunk;
413			}
414			while (chunk > 0);
415	douglas	19	}
416
417	douglas	208	if (!binary)
418	douglas	20	{
419	douglas	208	string page = this->page.str();
420
421			for (unsigned index = 0; index < page.length(); index++)
422	douglas	20	{
423	douglas	208	if (page[index] == '\r' && (index + 1 < page.length()) ? page[index +
424			1] == '\n' : false)
425			{
426			page.erase(index, 1);
427			}
428			else if (page[index] == '\r')
429			{
430			page[index] = '\n';
431			}
432	douglas	20	}
433	douglas	208
434			this->page.str(page);
435	douglas	20	}
436	douglas	19	}
437
438	douglas	14	void HttpHandler::putline(const string line)
439			{
440			sprintf(buffer, "%s\r\n", line.c_str());
441	douglas	208
442			#ifndef _OpenSSL_
443	douglas	14	if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
444			{
445			error(program + ": Send");
446			exit(1);
447			}
448	douglas	208	#else
449			if (!tls)
450			{
451			if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
452			{
453			error(program + ": Send");
454			exit(1);
455			}
456			}
457			else
458			{
459			int number;
460
461			if ((number = SSL_write(ssl, buffer, strlen(buffer))) <= 0)
462			{
463			error(program + ": SSL Write", number);
464			exit(1);
465			}
466			}
467			#endif
468	douglas	14	}
469
470	douglas	17	string HttpHandler::getline()
471			{
472			string line;
473			char byte;
474
475			do
476			{
477	douglas	208	#ifndef _OpenSSL_
478	douglas	17	if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
479			{
480			error(program + ": Recv");
481			}
482	douglas	208	#else
483			if (!tls)
484			{
485			if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
486			{
487			error(program + ": Recv");
488			}
489			}
490			else
491			{
492			int number;
493	douglas	17
494	douglas	208	if ((number = SSL_read(ssl, &byte, 1)) <= 0)
495			{
496			error(program + ": SSL Read", number);
497			}
498			}
499			#endif
500
501	douglas	17	if (byte != '\r' && byte != '\n')
502			{
503			line += byte;
504			}
505			}
506			while (byte != '\n');
507
508			return line;
509			}
510
511	douglas	18	void HttpHandler::error(const string& prefix, bool host)
512	douglas	1	{
513	douglas	13	#ifdef _WIN32
514			string error;
515	douglas	1
516	douglas	13	switch (WSAGetLastError())
517	douglas	1	{
518	douglas	13	case WSAEACCES:
519	douglas	180	error = "Permission denied";
520	douglas	13	break;
521			case WSAEADDRINUSE:
522	douglas	180	error = "Address already in use";
523	douglas	13	break;
524			case WSAEADDRNOTAVAIL:
525	douglas	180	error = "Cannot assign requested address";
526	douglas	13	break;
527			case WSAEAFNOSUPPORT:
528	douglas	180	error = "Address family not supported by protocol family";
529	douglas	13	break;
530			case WSAEALREADY:
531	douglas	180	error = "Operation already in progress";
532	douglas	13	break;
533			case WSAECONNABORTED:
534	douglas	180	error = "Software caused connection abort";
535	douglas	13	break;
536			case WSAECONNREFUSED:
537	douglas	180	error = "Connection refused";
538	douglas	13	break;
539			case WSAECONNRESET:
540	douglas	180	error = "Connection reset by peer";
541	douglas	13	break;
542			case WSAEDESTADDRREQ:
543	douglas	180	error = "Destination address required";
544	douglas	13	break;
545			case WSAEFAULT:
546	douglas	180	error = "Bad address";
547	douglas	13	break;
548			case WSAEHOSTDOWN:
549	douglas	180	error = "Host is down";
550	douglas	13	break;
551			case WSAEHOSTUNREACH:
552	douglas	180	error = "No route to host";
553	douglas	13	break;
554			case WSAEINPROGRESS:
555	douglas	180	error = "Operation now in progress";
556	douglas	13	break;
557			case WSAEINTR:
558	douglas	180	error = "Interrupted function call";
559	douglas	13	break;
560			case WSAEINVAL:
561	douglas	180	error = "Invalid argument";
562	douglas	13	break;
563			case WSAEISCONN:
564	douglas	180	error = "Socket is already connected";
565	douglas	13	break;
566			case WSAEMFILE:
567	douglas	180	error = "Too many open files";
568	douglas	13	break;
569			case WSAEMSGSIZE:
570	douglas	180	error = "Message too long";
571	douglas	13	break;
572			case WSAENETDOWN:
573	douglas	180	error = "Network is down";
574	douglas	13	break;
575			case WSAENETRESET:
576	douglas	180	error = "Network dropped connection on reset";
577	douglas	13	break;
578			case WSAENETUNREACH:
579	douglas	180	error = "Network is unreachable";
580	douglas	13	break;
581			case WSAENOBUFS:
582	douglas	180	error = "No buffer space available";
583	douglas	13	break;
584			case WSAENOPROTOOPT:
585	douglas	180	error = "Bad protocol option";
586	douglas	13	break;
587			case WSAENOTCONN:
588	douglas	180	error = "Socket is not connected";
589	douglas	13	break;
590			case WSAENOTSOCK:
591	douglas	180	error = "Socket operation on non-socket";
592	douglas	13	break;
593			case WSAEOPNOTSUPP:
594	douglas	180	error = "Operation not supported";
595	douglas	13	break;
596			case WSAEPFNOSUPPORT:
597	douglas	180	error = "Protocol family not supported";
598	douglas	13	break;
599			case WSAEPROCLIM:
600	douglas	180	error = "Too many processes";
601	douglas	13	break;
602			case WSAEPROTONOSUPPORT:
603	douglas	180	error = "Protocol not supported";
604	douglas	13	break;
605			case WSAEPROTOTYPE:
606	douglas	180	error = "Protocol wrong type for socket";
607	douglas	13	break;
608			case WSAESHUTDOWN:
609	douglas	180	error = "Cannot send after socket shutdown";
610	douglas	13	break;
611			case WSAESOCKTNOSUPPORT:
612	douglas	180	error = "Socket type not supported";
613	douglas	13	break;
614			case WSAETIMEDOUT:
615	douglas	180	error = "Connection timed out";
616	douglas	13	break;
617			case WSATYPE_NOT_FOUND:
618	douglas	180	error = "Class type not found";
619	douglas	13	break;
620			case WSAEWOULDBLOCK:
621	douglas	180	error = "Resource temporarily unavailable";
622	douglas	13	break;
623			case WSAHOST_NOT_FOUND:
624	douglas	180	error = "Host not found";
625	douglas	13	break;
626			case WSA_INVALID_HANDLE:
627	douglas	180	error = "Specified event object handle is invalid";
628	douglas	13	break;
629			case WSA_INVALID_PARAMETER:
630	douglas	180	error = "One or more parameters are invalid";
631	douglas	13	break;
632			// case WSAINVALIDPROCTABLE:
633	douglas	180	// error = "Invalid procedure table from service provider";
634	douglas	13	// break;
635			// case WSAINVALIDPROVIDER:
636	douglas	180	// error = "Invalid service provider version number";
637	douglas	13	// break;
638			case WSA_IO_INCOMPLETE:
639	douglas	180	error = "Overlapped I/O event object not in signaled state";
640	douglas	13	break;
641			case WSA_IO_PENDING:
642	douglas	180	error = "Overlapped operations will complete later";
643	douglas	13	break;
644			case WSA_NOT_ENOUGH_MEMORY:
645	douglas	180	error = "Insufficient memory available";
646	douglas	13	break;
647			case WSANOTINITIALISED:
648	douglas	180	error = "Successful WSAStartup not yet performed";
649	douglas	13	break;
650			case WSANO_DATA:
651	douglas	180	error = "Valid name, no data record of requested type";
652	douglas	13	break;
653			case WSANO_RECOVERY:
654	douglas	180	error = "This is a non-recoverable error";
655	douglas	13	break;
656			// case WSAPROVIDERFAILEDINIT:
657	douglas	180	// error = "Unable to initialize a service provider";
658	douglas	13	// break;
659			case WSASYSCALLFAILURE:
660	douglas	180	error = "System call failure";
661	douglas	13	break;
662			case WSASYSNOTREADY:
663	douglas	180	error = "Network subsystem is unavailable";
664	douglas	13	break;
665			case WSATRY_AGAIN:
666	douglas	180	error = "Non-authoritative host not found";
667	douglas	13	break;
668			case WSAVERNOTSUPPORTED:
669	douglas	180	error = "WINSOCK.DLL version out of range";
670	douglas	13	break;
671			case WSAEDISCON:
672	douglas	180	error = "Graceful shutdown in progress";
673	douglas	13	break;
674			case WSA_OPERATION_ABORTED:
675	douglas	180	error = "Overlapped operation aborted";
676	douglas	13	break;
677			default:
678	douglas	180	error = "Unknown error";
679	douglas	13	break;
680			}
681	douglas	1
682	douglas	13	cerr << prefix << ": " << error << "\n";
683			#else
684			if (host)
685			{
686	douglas	179	string error;
687
688			switch (h_errno)
689			{
690			case HOST_NOT_FOUND:
691			error = "Unknown host";
692			break;
693			case TRY_AGAIN:
694			error = "Host name lookup failure";
695			break;
696			case NO_RECOVERY:
697			error = "Unknown server error";
698			break;
699			case NO_DATA:
700			error = "No address associated with name";
701			break;
702			default:
703			error = "Unknown error";
704			break;
705			}
706
707			cerr << prefix << ": " << error << "\n";
708	douglas	1	}
709			else
710			{
711	douglas	13	perror(prefix.c_str());
712	douglas	1	}
713	douglas	13	#endif // _WIN32
714			}
715	douglas	208
716			#ifdef _OpenSSL_
717			void HttpHandler::error(const string& prefix, int number)
718			{
719			string error;
720
721			switch (SSL_get_error(ssl, number))
722			{
723			case SSL_ERROR_NONE:
724			error = "The TLS/SSL I/O operation completed";
725			break;
726			case SSL_ERROR_ZERO_RETURN:
727			error = "The TLS/SSL connection has been closed";
728			break;
729			case SSL_ERROR_WANT_READ:
730			case SSL_ERROR_WANT_WRITE:
731			case SSL_ERROR_WANT_CONNECT:
732			// case SSL_ERROR_WANT_ACCEPT:
733			case SSL_ERROR_WANT_X509_LOOKUP:
734			error = "The operation did not complete";
735			break;
736			case SSL_ERROR_SYSCALL:
737			if (int err = ERR_get_error() != 0)
738			{
739			error = ERR_reason_error_string(err);
740			}
741			else
742			{
743			switch (number)
744			{
745			case 0:
746			error = "An EOF was observed that violates the protocol";
747			break;
748			case -1:
749			this->error(prefix);
750			return;
751			default:
752			error = "Unknown error";
753			break;
754			}
755			}
756			break;
757			case SSL_ERROR_SSL:
758			error = ERR_reason_error_string(ERR_get_error());
759			break;
760			default:
761			error = "Unknown error";
762			break;
763			}
764
765			cerr << prefix << ": " << error << "\n";
766			}
767
768			bool HttpHandler::starttls()
769			{
770			SSL_load_error_strings();
771			SSL_library_init();
772
773	douglas	211	#ifndef _urandomdev_
774			int pid = getpid();
775			int now = time(NULL);
776	douglas	208
777	douglas	211	unsigned seed = now > pid ? now - pid : pid - now;
778
779			char* junk = new char[seed % 30 + 2];
780			junk[0] = pid;
781			junk[seed % 30 + 1] = now;
782
783			srand(seed);
784
785			for (int index = 1; index < seed % 30 + 1; index++)
786			{
787			junk[index] = rand();
788			}
789
790			if (debug)
791			{
792			cerr << "junk = {\n";
793
794			for (int index = 1; index < seed % 30 + 2; index++)
795			{
796			cerr << " [" << index << "] = " << int(junk[index]) << "\n";
797			}
798
799			cerr << "}\n";
800			}
801
802			RAND_seed(junk, seed % 30 + 2);
803
804			delete junk;
805			#endif
806
807			ctx = SSL_CTX_new(TLSv1_client_method());
808
809			if (ctx == NULL)
810			{
811			cerr << program << ": SSL CTX New: "
812			<< ERR_reason_error_string(ERR_get_error()) << "\n";
813			return false;
814			}
815
816			ssl = SSL_new(ctx);
817
818			if (SSL_set_fd(ssl, http) == 0)
819			{
820			cerr << program << ": SSL Set FD: "
821			<< ERR_reason_error_string(ERR_get_error()) << "\n";
822			return false;
823			}
824
825			int number;
826
827			if ((number = SSL_connect(ssl)) <= 0)
828			{
829			error(program + ": SSL Connect", number);
830			return false;
831			}
832
833	douglas	208	return true;
834			}
835			#endif