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 1.22 2003/07/20 01:46:12 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>
#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 = strtoul(line.substr(5, dot - 5).c_str(), 0, 10);
                unsigned minor = strtoul(line.substr(dot + 1, space - dot - 1).c_str(),
                        0, 10);

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

                        return answer;
                }

                response = code(strtoul(line.substr(space + 1).c_str(), 0, 10));

                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")
                        {
                                length = strtoul(value.c_str(), 0, 10);
                        }
                        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
                {
                        chunk = strtoul(getline().c_str(), 0, 16);

                        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:	211
Committed:	2003-07-19T18:46:12-07:00 (21 years, 11 months ago) by douglas
File size:	16618 byte(s)
Log Message:	OpenSSL stuff should work, made string tolower inline function, fixed size output in Outputer.body().
#	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	211	// $Id: HttpHandler.cpp,v 1.22 2003/07/20 01:46:12 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			#endif
62
63	douglas	1	HttpHandler::HttpHandler()
64			{
65	douglas	14	buffer = new char[BUFSIZ + 1];
66
67	douglas	13	#ifdef _WIN32
68	douglas	14	if (WSAStartup(MAKEWORD(2, 0), &data) != 0)
69	douglas	13	{
70	douglas	17	error(program + ": WSAStartup");
71	douglas	13	exit(1);
72			}
73			#endif // _WIN32
74	douglas	1
75	douglas	208	binary = false;
76	douglas	18	length = 0;
77			chunked = false;
78	douglas	201	#ifdef _OpenSSL_
79			tls = false;
80			#endif
81	douglas	1	}
82
83			HttpHandler::~HttpHandler()
84			{
85	douglas	14	delete [] buffer;
86
87	douglas	13	#ifdef _WIN32
88			WSACleanup();
89			#endif // _WIN32
90	douglas	1	}
91
92	douglas	25	bool HttpHandler::handle(URL &url, const string referer, bool head)
93	douglas	1	{
94			bool answer = false;
95
96	douglas	14	if ((http = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
97			{
98			error(program + ": Socket");
99			exit(1);
100			}
101	douglas	1
102	douglas	14	sockaddr_in address;
103			hostent* host;
104	douglas	1
105	douglas	14	address.sin_family = AF_INET;
106	douglas	1
107	douglas	14	if ((host = gethostbyname(url.getAddress().c_str())) == NULL)
108			{
109			error(program + ": Host: " + url.getAddress(), true);
110			return answer;
111			}
112	douglas	1
113	douglas	14	address.sin_addr = ((in_addr)*host->h_addr_list);
114			address.sin_port = htons(url.getPort());
115
116			if (connect(http, (sockaddr*)&address, sizeof(sockaddr_in)) ==
117			SOCKET_ERROR)
118			{
119			error(program + ": Connect");
120			return answer;
121			}
122
123	douglas	208	#ifdef _OpenSSL_
124			if (url.getTls())
125			{
126			tls = true;
127
128			if (!starttls()) return answer;
129			}
130			#endif
131
132	douglas	14	if (head)
133			{
134			putline("HEAD " + url.getPath() + " HTTP/1.1");
135			}
136			else
137			{
138			putline("GET " + url.getPath() + " HTTP/1.1");
139			}
140
141			putline("Accept: text/html; text/plain");
142	douglas	201	#ifndef _OpenSSL_
143	douglas	14	putline("User-Agent: " + agent(true) + ' ' + platform());
144	douglas	208
145			if (url.getPort() == 80)
146	douglas	201	#else
147			putline("User-Agent: " + agent(true) + ' ' + platform() + ' '
148			+ openssl(true));
149	douglas	208
150			if (url.getPort() == 80 && tls \|\| url.getPort() == 443 && tls)
151	douglas	201	#endif
152	douglas	14	{
153			putline("Host: " + url.getAddress());
154			}
155			else
156			{
157	douglas	208	ostringstream port;
158	douglas	14
159	douglas	208	port << url.getPort();
160	douglas	14
161	douglas	208	putline("Host: " + url.getAddress() + ':' + port.str());
162	douglas	14	}
163
164	douglas	25	if (referer != "")
165			{
166			putline("Referer: " + referer);
167			}
168
169	douglas	18	putline("Connection: close");
170	douglas	14	putline();
171
172	douglas	18	code response;
173			string line;
174	douglas	17
175	douglas	18	do
176	douglas	17	{
177	douglas	18	line = getline();
178	douglas	17
179	douglas	18	if (line.find("HTTP/") != 0)
180			{
181			return answer;
182			}
183	douglas	17
184	douglas	18	unsigned dot = line.find('.');
185			unsigned space = line.find(' ');
186	douglas	17
187	douglas	19	unsigned major = strtoul(line.substr(5, dot - 5).c_str(), 0, 10);
188			unsigned minor = strtoul(line.substr(dot + 1, space - dot - 1).c_str(),
189			0, 10);
190	douglas	17
191	douglas	24	if (major > 1)
192	douglas	18	{
193	douglas	19	cerr << program << ": Potentially Incompatible Server: HTTP/" <<
194			major << "." << minor << "\n";
195	douglas	18
196			return answer;
197			}
198
199	douglas	19	response = code(strtoul(line.substr(space + 1).c_str(), 0, 10));
200	douglas	18
201			if (response < ok) do line = getline(); while (line != "");
202	douglas	17	}
203	douglas	18	while (response < ok);
204	douglas	17
205			do
206			{
207			line = getline();
208	douglas	18
209			if (line != "")
210			{
211			unsigned colon = line.find(':');
212
213			string field = line.substr(0, colon);
214			string value = line.substr(colon + 1);
215
216			while (isspace(value[0])) value.erase(0, 1);
217
218	douglas	19	if (field == "Content-Type")
219			{
220			type = value;
221			}
222			else if (field == "Content-Length")
223			{
224			length = strtoul(value.c_str(), 0, 10);
225			}
226			else if (field == "Location")
227			{
228			location = value;
229			}
230			else if (field == "Transfer-Encoding")
231			{
232			chunked = value == "chunked";
233			}
234	douglas	18	}
235	douglas	17	}
236			while (line != "");
237
238			switch (response)
239			{
240			case ok:
241	douglas	18	if (debug) cerr << "response = " << response << "\n";
242	douglas	17	answer = true;
243			break;
244	douglas	18	case choices:
245	douglas	17	case moved:
246			case found:
247	douglas	18	if (debug) cerr << "response = " << response << "\n"
248			<< "location = " << location << "\n";
249			location = getLink(location, url);
250	douglas	17	break;
251			case notfound:
252			case internal:
253	douglas	18	if (debug) cerr << "response = " << response << "\n";
254	douglas	17	break;
255			default:
256	douglas	18	if (debug) cerr << "response = " << response << "\n";
257			if (response <= 299)
258			{
259			answer = true;
260			}
261			else if (response <= 399)
262			{
263			location = getLink(location, url);
264			}
265	douglas	17	break;
266			}
267
268	douglas	19	if (!head && answer) populate();
269
270	douglas	1	return answer;
271			}
272
273	douglas	208	void HttpHandler::clear()
274	douglas	1	{
275	douglas	208	if (tls)
276	douglas	1	{
277	douglas	208	SSL_shutdown(ssl);
278			SSL_free(ssl);
279			SSL_CTX_free(ctx);
280	douglas	1	}
281
282	douglas	18	closesocket(http);
283
284	douglas	17	type = "";
285			length = 0;
286			location = "";
287	douglas	208	page.clear();
288			page.str("");
289	douglas	18	chunked = false;
290	douglas	201	#ifdef _OpenSSL_
291			tls = false;
292			#endif
293	douglas	1	}
294
295	douglas	19	void HttpHandler::populate()
296			{
297			if (!chunked)
298			{
299			unsigned left = length;
300
301			while (left > 0)
302			{
303			memset(buffer, 0, BUFSIZ + 1);
304
305			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
306	douglas	208	long received;
307	douglas	19
308	douglas	145	while (true)
309	douglas	19	{
310	douglas	208	#ifndef _OpenSSL_
311	douglas	145	if ((received = recv(http, buffer, bytes, 0)) == SOCKET_ERROR)
312	douglas	24	{
313			error(program + ": Recv");
314			exit(1);
315			}
316	douglas	208	#else
317			if ((received = !tls ? recv(http, buffer, bytes, 0) :
318			SSL_read(ssl, buffer, bytes)) <= 0)
319			{
320			!tls ? error(program + ": Recv") : error(program +
321	douglas	209	": SSL Read", int(received));
322	douglas	208	}
323			#endif
324	douglas	145	else if (received != bytes)
325			{
326			left -= received;
327	douglas	208	page << buffer;
328	douglas	145
329			memset(buffer, 0, BUFSIZ + 1);
330
331			bytes -= received;
332			}
333			else
334			{
335			break;
336			}
337	douglas	24	}
338
339	douglas	208	page << buffer;
340	douglas	19	left -= bytes;
341			}
342			}
343			else
344			{
345	douglas	20	unsigned chunk;
346
347			do
348			{
349			chunk = strtoul(getline().c_str(), 0, 16);
350
351			unsigned left = chunk;
352
353			while (left > 0)
354			{
355			memset(buffer, 0, BUFSIZ + 1);
356
357			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
358	douglas	208	long received;
359	douglas	20
360	douglas	145	while (true)
361	douglas	20	{
362	douglas	208	#ifndef _OpenSSL_
363	douglas	145	if ((received = recv(http, buffer, bytes, 0)) ==
364			SOCKET_ERROR)
365	douglas	24	{
366			error(program + ": Recv");
367			exit(1);
368			}
369	douglas	208	#else
370			if ((received = !tls ? recv(http, buffer, bytes, 0) :
371			SSL_read(ssl, buffer, bytes)) <= 0)
372			{
373			!tls ? error(program + ": Recv") : error(program +
374	douglas	209	": SSL Read", int(received));
375	douglas	208	exit(1);
376			}
377			#endif
378	douglas	145	else if (received != bytes)
379			{
380			left -= received;
381	douglas	208	page << buffer;
382	douglas	145
383			memset(buffer, 0, BUFSIZ + 1);
384
385			bytes -= received;
386			}
387			else
388			{
389			break;
390			}
391	douglas	24	}
392
393	douglas	208	page << buffer;
394	douglas	20	left -= bytes;
395			}
396
397			getline();
398			length += chunk;
399			}
400			while (chunk > 0);
401	douglas	19	}
402
403	douglas	208	if (!binary)
404	douglas	20	{
405	douglas	208	string page = this->page.str();
406
407			for (unsigned index = 0; index < page.length(); index++)
408	douglas	20	{
409	douglas	208	if (page[index] == '\r' && (index + 1 < page.length()) ? page[index +
410			1] == '\n' : false)
411			{
412			page.erase(index, 1);
413			}
414			else if (page[index] == '\r')
415			{
416			page[index] = '\n';
417			}
418	douglas	20	}
419	douglas	208
420			this->page.str(page);
421	douglas	20	}
422	douglas	19	}
423
424	douglas	14	void HttpHandler::putline(const string line)
425			{
426			sprintf(buffer, "%s\r\n", line.c_str());
427	douglas	208
428			#ifndef _OpenSSL_
429	douglas	14	if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
430			{
431			error(program + ": Send");
432			exit(1);
433			}
434	douglas	208	#else
435			if (!tls)
436			{
437			if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
438			{
439			error(program + ": Send");
440			exit(1);
441			}
442			}
443			else
444			{
445			int number;
446
447			if ((number = SSL_write(ssl, buffer, strlen(buffer))) <= 0)
448			{
449			error(program + ": SSL Write", number);
450			exit(1);
451			}
452			}
453			#endif
454	douglas	14	}
455
456	douglas	17	string HttpHandler::getline()
457			{
458			string line;
459			char byte;
460
461			do
462			{
463	douglas	208	#ifndef _OpenSSL_
464	douglas	17	if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
465			{
466			error(program + ": Recv");
467			}
468	douglas	208	#else
469			if (!tls)
470			{
471			if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
472			{
473			error(program + ": Recv");
474			}
475			}
476			else
477			{
478			int number;
479	douglas	17
480	douglas	208	if ((number = SSL_read(ssl, &byte, 1)) <= 0)
481			{
482			error(program + ": SSL Read", number);
483			}
484			}
485			#endif
486
487	douglas	17	if (byte != '\r' && byte != '\n')
488			{
489			line += byte;
490			}
491			}
492			while (byte != '\n');
493
494			return line;
495			}
496
497	douglas	18	void HttpHandler::error(const string& prefix, bool host)
498	douglas	1	{
499	douglas	13	#ifdef _WIN32
500			string error;
501	douglas	1
502	douglas	13	switch (WSAGetLastError())
503	douglas	1	{
504	douglas	13	case WSAEACCES:
505	douglas	180	error = "Permission denied";
506	douglas	13	break;
507			case WSAEADDRINUSE:
508	douglas	180	error = "Address already in use";
509	douglas	13	break;
510			case WSAEADDRNOTAVAIL:
511	douglas	180	error = "Cannot assign requested address";
512	douglas	13	break;
513			case WSAEAFNOSUPPORT:
514	douglas	180	error = "Address family not supported by protocol family";
515	douglas	13	break;
516			case WSAEALREADY:
517	douglas	180	error = "Operation already in progress";
518	douglas	13	break;
519			case WSAECONNABORTED:
520	douglas	180	error = "Software caused connection abort";
521	douglas	13	break;
522			case WSAECONNREFUSED:
523	douglas	180	error = "Connection refused";
524	douglas	13	break;
525			case WSAECONNRESET:
526	douglas	180	error = "Connection reset by peer";
527	douglas	13	break;
528			case WSAEDESTADDRREQ:
529	douglas	180	error = "Destination address required";
530	douglas	13	break;
531			case WSAEFAULT:
532	douglas	180	error = "Bad address";
533	douglas	13	break;
534			case WSAEHOSTDOWN:
535	douglas	180	error = "Host is down";
536	douglas	13	break;
537			case WSAEHOSTUNREACH:
538	douglas	180	error = "No route to host";
539	douglas	13	break;
540			case WSAEINPROGRESS:
541	douglas	180	error = "Operation now in progress";
542	douglas	13	break;
543			case WSAEINTR:
544	douglas	180	error = "Interrupted function call";
545	douglas	13	break;
546			case WSAEINVAL:
547	douglas	180	error = "Invalid argument";
548	douglas	13	break;
549			case WSAEISCONN:
550	douglas	180	error = "Socket is already connected";
551	douglas	13	break;
552			case WSAEMFILE:
553	douglas	180	error = "Too many open files";
554	douglas	13	break;
555			case WSAEMSGSIZE:
556	douglas	180	error = "Message too long";
557	douglas	13	break;
558			case WSAENETDOWN:
559	douglas	180	error = "Network is down";
560	douglas	13	break;
561			case WSAENETRESET:
562	douglas	180	error = "Network dropped connection on reset";
563	douglas	13	break;
564			case WSAENETUNREACH:
565	douglas	180	error = "Network is unreachable";
566	douglas	13	break;
567			case WSAENOBUFS:
568	douglas	180	error = "No buffer space available";
569	douglas	13	break;
570			case WSAENOPROTOOPT:
571	douglas	180	error = "Bad protocol option";
572	douglas	13	break;
573			case WSAENOTCONN:
574	douglas	180	error = "Socket is not connected";
575	douglas	13	break;
576			case WSAENOTSOCK:
577	douglas	180	error = "Socket operation on non-socket";
578	douglas	13	break;
579			case WSAEOPNOTSUPP:
580	douglas	180	error = "Operation not supported";
581	douglas	13	break;
582			case WSAEPFNOSUPPORT:
583	douglas	180	error = "Protocol family not supported";
584	douglas	13	break;
585			case WSAEPROCLIM:
586	douglas	180	error = "Too many processes";
587	douglas	13	break;
588			case WSAEPROTONOSUPPORT:
589	douglas	180	error = "Protocol not supported";
590	douglas	13	break;
591			case WSAEPROTOTYPE:
592	douglas	180	error = "Protocol wrong type for socket";
593	douglas	13	break;
594			case WSAESHUTDOWN:
595	douglas	180	error = "Cannot send after socket shutdown";
596	douglas	13	break;
597			case WSAESOCKTNOSUPPORT:
598	douglas	180	error = "Socket type not supported";
599	douglas	13	break;
600			case WSAETIMEDOUT:
601	douglas	180	error = "Connection timed out";
602	douglas	13	break;
603			case WSATYPE_NOT_FOUND:
604	douglas	180	error = "Class type not found";
605	douglas	13	break;
606			case WSAEWOULDBLOCK:
607	douglas	180	error = "Resource temporarily unavailable";
608	douglas	13	break;
609			case WSAHOST_NOT_FOUND:
610	douglas	180	error = "Host not found";
611	douglas	13	break;
612			case WSA_INVALID_HANDLE:
613	douglas	180	error = "Specified event object handle is invalid";
614	douglas	13	break;
615			case WSA_INVALID_PARAMETER:
616	douglas	180	error = "One or more parameters are invalid";
617	douglas	13	break;
618			// case WSAINVALIDPROCTABLE:
619	douglas	180	// error = "Invalid procedure table from service provider";
620	douglas	13	// break;
621			// case WSAINVALIDPROVIDER:
622	douglas	180	// error = "Invalid service provider version number";
623	douglas	13	// break;
624			case WSA_IO_INCOMPLETE:
625	douglas	180	error = "Overlapped I/O event object not in signaled state";
626	douglas	13	break;
627			case WSA_IO_PENDING:
628	douglas	180	error = "Overlapped operations will complete later";
629	douglas	13	break;
630			case WSA_NOT_ENOUGH_MEMORY:
631	douglas	180	error = "Insufficient memory available";
632	douglas	13	break;
633			case WSANOTINITIALISED:
634	douglas	180	error = "Successful WSAStartup not yet performed";
635	douglas	13	break;
636			case WSANO_DATA:
637	douglas	180	error = "Valid name, no data record of requested type";
638	douglas	13	break;
639			case WSANO_RECOVERY:
640	douglas	180	error = "This is a non-recoverable error";
641	douglas	13	break;
642			// case WSAPROVIDERFAILEDINIT:
643	douglas	180	// error = "Unable to initialize a service provider";
644	douglas	13	// break;
645			case WSASYSCALLFAILURE:
646	douglas	180	error = "System call failure";
647	douglas	13	break;
648			case WSASYSNOTREADY:
649	douglas	180	error = "Network subsystem is unavailable";
650	douglas	13	break;
651			case WSATRY_AGAIN:
652	douglas	180	error = "Non-authoritative host not found";
653	douglas	13	break;
654			case WSAVERNOTSUPPORTED:
655	douglas	180	error = "WINSOCK.DLL version out of range";
656	douglas	13	break;
657			case WSAEDISCON:
658	douglas	180	error = "Graceful shutdown in progress";
659	douglas	13	break;
660			case WSA_OPERATION_ABORTED:
661	douglas	180	error = "Overlapped operation aborted";
662	douglas	13	break;
663			default:
664	douglas	180	error = "Unknown error";
665	douglas	13	break;
666			}
667	douglas	1
668	douglas	13	cerr << prefix << ": " << error << "\n";
669			#else
670			if (host)
671			{
672	douglas	179	string error;
673
674			switch (h_errno)
675			{
676			case HOST_NOT_FOUND:
677			error = "Unknown host";
678			break;
679			case TRY_AGAIN:
680			error = "Host name lookup failure";
681			break;
682			case NO_RECOVERY:
683			error = "Unknown server error";
684			break;
685			case NO_DATA:
686			error = "No address associated with name";
687			break;
688			default:
689			error = "Unknown error";
690			break;
691			}
692
693			cerr << prefix << ": " << error << "\n";
694	douglas	1	}
695			else
696			{
697	douglas	13	perror(prefix.c_str());
698	douglas	1	}
699	douglas	13	#endif // _WIN32
700			}
701	douglas	208
702			#ifdef _OpenSSL_
703			void HttpHandler::error(const string& prefix, int number)
704			{
705			string error;
706
707			switch (SSL_get_error(ssl, number))
708			{
709			case SSL_ERROR_NONE:
710			error = "The TLS/SSL I/O operation completed";
711			break;
712			case SSL_ERROR_ZERO_RETURN:
713			error = "The TLS/SSL connection has been closed";
714			break;
715			case SSL_ERROR_WANT_READ:
716			case SSL_ERROR_WANT_WRITE:
717			case SSL_ERROR_WANT_CONNECT:
718			// case SSL_ERROR_WANT_ACCEPT:
719			case SSL_ERROR_WANT_X509_LOOKUP:
720			error = "The operation did not complete";
721			break;
722			case SSL_ERROR_SYSCALL:
723			if (int err = ERR_get_error() != 0)
724			{
725			error = ERR_reason_error_string(err);
726			}
727			else
728			{
729			switch (number)
730			{
731			case 0:
732			error = "An EOF was observed that violates the protocol";
733			break;
734			case -1:
735			this->error(prefix);
736			return;
737			default:
738			error = "Unknown error";
739			break;
740			}
741			}
742			break;
743			case SSL_ERROR_SSL:
744			error = ERR_reason_error_string(ERR_get_error());
745			break;
746			default:
747			error = "Unknown error";
748			break;
749			}
750
751			cerr << prefix << ": " << error << "\n";
752			}
753
754			bool HttpHandler::starttls()
755			{
756			SSL_load_error_strings();
757			SSL_library_init();
758
759	douglas	211	#ifndef _urandomdev_
760			int pid = getpid();
761			int now = time(NULL);
762	douglas	208
763	douglas	211	unsigned seed = now > pid ? now - pid : pid - now;
764
765			char* junk = new char[seed % 30 + 2];
766			junk[0] = pid;
767			junk[seed % 30 + 1] = now;
768
769			srand(seed);
770
771			for (int index = 1; index < seed % 30 + 1; index++)
772			{
773			junk[index] = rand();
774			}
775
776			if (debug)
777			{
778			cerr << "junk = {\n";
779
780			for (int index = 1; index < seed % 30 + 2; index++)
781			{
782			cerr << " [" << index << "] = " << int(junk[index]) << "\n";
783			}
784
785			cerr << "}\n";
786			}
787
788			RAND_seed(junk, seed % 30 + 2);
789
790			delete junk;
791			#endif
792
793			ctx = SSL_CTX_new(TLSv1_client_method());
794
795			if (ctx == NULL)
796			{
797			cerr << program << ": SSL CTX New: "
798			<< ERR_reason_error_string(ERR_get_error()) << "\n";
799			return false;
800			}
801
802			ssl = SSL_new(ctx);
803
804			if (SSL_set_fd(ssl, http) == 0)
805			{
806			cerr << program << ": SSL Set FD: "
807			<< ERR_reason_error_string(ERR_get_error()) << "\n";
808			return false;
809			}
810
811			int number;
812
813			if ((number = SSL_connect(ssl)) <= 0)
814			{
815			error(program + ": SSL Connect", number);
816			return false;
817			}
818
819	douglas	208	return true;
820			}
821			#endif