trunk/Search/HttpHandler.cpp

/* ============================================================================
 * Douglas Thrift's Search Engine License
 *
 * Copyright (C) 2002, 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
//
// HttpHandler.cpp

#include "HttpHandler.h"

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

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

        length = 0;
        chunked = false;
}

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

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

bool HttpHandler::handle(URL &url, 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;
        }

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

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

        if (url.getPort() == 80)
        {
                putline("Host: " + url.getAddress());
        }
        else
        {
                char* port = new char[1024];
                sprintf(port, "%u", url.getPort());

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

                delete [] port;
        }

//      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 || minor < 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;
}

HttpHandler& HttpHandler::getline(string& line, char endline)
{
        unsigned end = page.find(endline);
        unsigned newline = page.find('\n');

        if (newline < end || end == string::npos)
        {
                end = newline;
        }

        line = page.substr(0, end);
        page.erase(0, (end == string::npos ? end : end + 1));

        return *this;
}

void HttpHandler::clear()
{
        closesocket(http);

        type = "";
        length = 0;
        location = "";
        page = "";
        chunked = false;
}

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

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

                        unsigned bytes = left > BUFSIZ ? BUFSIZ : left;

                        if (recv(http, buffer, bytes, 0) == SOCKET_ERROR)
                        {
                                error(program + ": Recv");
                                exit(1);
                        }

                        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;

                                if (recv(http, buffer, bytes, 0) == SOCKET_ERROR)
                                {
                                        error(program + ": Recv");
                                        exit(1);
                                }

                                page += buffer;
                                left -= bytes;
                        }

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

        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';
                }
        }
}

void HttpHandler::putline(const string line)
{
        sprintf(buffer, "%s\r\n", line.c_str());
        if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
        {
                error(program + ": Send");
                exit(1);
        }
}

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

        do
        {
                if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
                {
                        error(program + ": Recv");
                }

                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)
        {
                herror(prefix.c_str());
        }
        else
        {
                perror(prefix.c_str());
        }
#endif // _WIN32
}
Revision:	21
Committed:	2002-12-10T14:44:50-08:00 (22 years, 6 months ago) by douglas
File size:	12088 byte(s)
Log Message:	Found the bug in private Processor.process() and fixed it.
#	User	Rev	Content
1	douglas	1	/* ============================================================================
2			* Douglas Thrift's Search Engine License
3			*
4			* Copyright (C) 2002, Douglas Thrift. All Rights Reserved.
5			* 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			// HttpHandler.cpp
50
51			#include "HttpHandler.h"
52
53			HttpHandler::HttpHandler()
54			{
55	douglas	14	buffer = new char[BUFSIZ + 1];
56
57	douglas	13	#ifdef _WIN32
58	douglas	14	if (WSAStartup(MAKEWORD(2, 0), &data) != 0)
59	douglas	13	{
60	douglas	17	error(program + ": WSAStartup");
61	douglas	13	exit(1);
62			}
63			#endif // _WIN32
64	douglas	1
65	douglas	18	length = 0;
66			chunked = false;
67	douglas	1	}
68
69			HttpHandler::~HttpHandler()
70			{
71	douglas	14	delete [] buffer;
72
73	douglas	13	#ifdef _WIN32
74			WSACleanup();
75			#endif // _WIN32
76	douglas	1	}
77
78	douglas	14	bool HttpHandler::handle(URL &url, bool head)
79	douglas	1	{
80			bool answer = false;
81
82	douglas	14	if ((http = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
83			{
84			error(program + ": Socket");
85			exit(1);
86			}
87	douglas	1
88	douglas	14	sockaddr_in address;
89			hostent* host;
90	douglas	1
91	douglas	14	address.sin_family = AF_INET;
92	douglas	1
93	douglas	14	if ((host = gethostbyname(url.getAddress().c_str())) == NULL)
94			{
95			error(program + ": Host: " + url.getAddress(), true);
96			return answer;
97			}
98	douglas	1
99	douglas	14	address.sin_addr = ((in_addr)*host->h_addr_list);
100			address.sin_port = htons(url.getPort());
101
102			if (connect(http, (sockaddr*)&address, sizeof(sockaddr_in)) ==
103			SOCKET_ERROR)
104			{
105			error(program + ": Connect");
106			return answer;
107			}
108
109			if (head)
110			{
111			putline("HEAD " + url.getPath() + " HTTP/1.1");
112			}
113			else
114			{
115			putline("GET " + url.getPath() + " HTTP/1.1");
116			}
117
118			putline("Accept: text/html; text/plain");
119			putline("User-Agent: " + agent(true) + ' ' + platform());
120
121			if (url.getPort() == 80)
122			{
123			putline("Host: " + url.getAddress());
124			}
125			else
126			{
127			char* port = new char[1024];
128			sprintf(port, "%u", url.getPort());
129
130			putline("Host: " + url.getAddress() + ':' + port);
131
132			delete [] port;
133			}
134
135	douglas	19	// putline("Referer: " + ?referer?);
136	douglas	18	putline("Connection: close");
137	douglas	14	putline();
138
139	douglas	18	code response;
140			string line;
141	douglas	17
142	douglas	18	do
143	douglas	17	{
144	douglas	18	line = getline();
145	douglas	17
146	douglas	18	if (line.find("HTTP/") != 0)
147			{
148			return answer;
149			}
150	douglas	17
151	douglas	18	unsigned dot = line.find('.');
152			unsigned space = line.find(' ');
153	douglas	17
154	douglas	19	unsigned major = strtoul(line.substr(5, dot - 5).c_str(), 0, 10);
155			unsigned minor = strtoul(line.substr(dot + 1, space - dot - 1).c_str(),
156			0, 10);
157	douglas	17
158	douglas	18	if (major > 1 \|\| minor < 1)
159			{
160	douglas	19	cerr << program << ": Potentially Incompatible Server: HTTP/" <<
161			major << "." << minor << "\n";
162	douglas	18
163			return answer;
164			}
165
166	douglas	19	response = code(strtoul(line.substr(space + 1).c_str(), 0, 10));
167	douglas	18
168			if (response < ok) do line = getline(); while (line != "");
169	douglas	17	}
170	douglas	18	while (response < ok);
171	douglas	17
172			do
173			{
174			line = getline();
175	douglas	18
176			if (line != "")
177			{
178			unsigned colon = line.find(':');
179
180			string field = line.substr(0, colon);
181			string value = line.substr(colon + 1);
182
183			while (isspace(value[0])) value.erase(0, 1);
184
185	douglas	19	if (field == "Content-Type")
186			{
187			type = value;
188			}
189			else if (field == "Content-Length")
190			{
191			length = strtoul(value.c_str(), 0, 10);
192			}
193			else if (field == "Location")
194			{
195			location = value;
196			}
197			else if (field == "Transfer-Encoding")
198			{
199			chunked = value == "chunked";
200			}
201	douglas	18	}
202	douglas	17	}
203			while (line != "");
204
205			switch (response)
206			{
207			case ok:
208	douglas	18	if (debug) cerr << "response = " << response << "\n";
209	douglas	17	answer = true;
210			break;
211	douglas	18	case choices:
212	douglas	17	case moved:
213			case found:
214	douglas	18	if (debug) cerr << "response = " << response << "\n"
215			<< "location = " << location << "\n";
216			location = getLink(location, url);
217	douglas	17	break;
218			case notfound:
219			case internal:
220	douglas	18	if (debug) cerr << "response = " << response << "\n";
221	douglas	17	break;
222			default:
223	douglas	18	if (debug) cerr << "response = " << response << "\n";
224			if (response <= 299)
225			{
226			answer = true;
227			}
228			else if (response <= 399)
229			{
230			location = getLink(location, url);
231			}
232	douglas	17	break;
233			}
234
235	douglas	19	if (!head && answer) populate();
236
237	douglas	1	return answer;
238			}
239
240			HttpHandler& HttpHandler::getline(string& line, char endline)
241			{
242	douglas	21	unsigned end = page.find(endline);
243			unsigned newline = page.find('\n');
244	douglas	1
245			if (newline < end \|\| end == string::npos)
246			{
247			end = newline;
248			}
249
250	douglas	20	line = page.substr(0, end);
251			page.erase(0, (end == string::npos ? end : end + 1));
252	douglas	1
253			return *this;
254			}
255
256			void HttpHandler::clear()
257			{
258	douglas	18	closesocket(http);
259
260	douglas	17	type = "";
261			length = 0;
262			location = "";
263	douglas	1	page = "";
264	douglas	18	chunked = false;
265	douglas	1	}
266
267	douglas	19	void HttpHandler::populate()
268			{
269			if (!chunked)
270			{
271			unsigned left = length;
272
273			while (left > 0)
274			{
275			memset(buffer, 0, BUFSIZ + 1);
276
277			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
278
279			if (recv(http, buffer, bytes, 0) == SOCKET_ERROR)
280			{
281	douglas	20	error(program + ": Recv");
282	douglas	19	exit(1);
283			}
284
285			page += buffer;
286			left -= bytes;
287			}
288			}
289			else
290			{
291	douglas	20	unsigned chunk;
292
293			do
294			{
295			chunk = strtoul(getline().c_str(), 0, 16);
296
297			unsigned left = chunk;
298
299			while (left > 0)
300			{
301			memset(buffer, 0, BUFSIZ + 1);
302
303			unsigned bytes = left > BUFSIZ ? BUFSIZ : left;
304
305			if (recv(http, buffer, bytes, 0) == SOCKET_ERROR)
306			{
307			error(program + ": Recv");
308			exit(1);
309			}
310
311			page += buffer;
312			left -= bytes;
313			}
314
315			getline();
316			length += chunk;
317			}
318			while (chunk > 0);
319	douglas	19	}
320
321	douglas	20	for (unsigned index = 0; index < page.length(); index++)
322			{
323			if (page[index] == '\r' && (index + 1 < page.length()) ? page[index +
324			1] == '\n' : false)
325			{
326			page.erase(index, 1);
327			}
328			else if (page[index] == '\r')
329			{
330			page[index] = '\n';
331			}
332			}
333	douglas	19	}
334
335	douglas	14	void HttpHandler::putline(const string line)
336			{
337			sprintf(buffer, "%s\r\n", line.c_str());
338			if (send(http, buffer, strlen(buffer), 0) == SOCKET_ERROR)
339			{
340			error(program + ": Send");
341			exit(1);
342			}
343			}
344
345	douglas	17	string HttpHandler::getline()
346			{
347			string line;
348			char byte;
349
350			do
351			{
352			if (recv(http, &byte, 1, 0) == SOCKET_ERROR)
353			{
354			error(program + ": Recv");
355			}
356
357			if (byte != '\r' && byte != '\n')
358			{
359			line += byte;
360			}
361			}
362			while (byte != '\n');
363
364			return line;
365			}
366
367	douglas	18	void HttpHandler::error(const string& prefix, bool host)
368	douglas	1	{
369	douglas	13	#ifdef _WIN32
370			string error;
371	douglas	1
372	douglas	13	switch (WSAGetLastError())
373	douglas	1	{
374	douglas	13	case WSAEACCES:
375			error = "Permission denied.";
376			break;
377			case WSAEADDRINUSE:
378			error = "Address already in use.";
379			break;
380			case WSAEADDRNOTAVAIL:
381			error = "Cannot assign requested address.";
382			break;
383			case WSAEAFNOSUPPORT:
384			error = "Address family not supported by protocol family.";
385			break;
386			case WSAEALREADY:
387			error = "Operation already in progress.";
388			break;
389			case WSAECONNABORTED:
390			error = "Software caused connection abort.";
391			break;
392			case WSAECONNREFUSED:
393			error = "Connection refused.";
394			break;
395			case WSAECONNRESET:
396			error = "Connection reset by peer.";
397			break;
398			case WSAEDESTADDRREQ:
399			error = "Destination address required.";
400			break;
401			case WSAEFAULT:
402			error = "Bad address.";
403			break;
404			case WSAEHOSTDOWN:
405			error = "Host is down.";
406			break;
407			case WSAEHOSTUNREACH:
408			error = "No route to host.";
409			break;
410			case WSAEINPROGRESS:
411			error = "Operation now in progress.";
412			break;
413			case WSAEINTR:
414			error = "Interrupted function call.";
415			break;
416			case WSAEINVAL:
417			error = "Invalid argument.";
418			break;
419			case WSAEISCONN:
420			error = "Socket is already connected.";
421			break;
422			case WSAEMFILE:
423			error = "Too many open files.";
424			break;
425			case WSAEMSGSIZE:
426			error = "Message too long.";
427			break;
428			case WSAENETDOWN:
429			error = "Network is down.";
430			break;
431			case WSAENETRESET:
432			error = "Network dropped connection on reset.";
433			break;
434			case WSAENETUNREACH:
435			error = "Network is unreachable.";
436			break;
437			case WSAENOBUFS:
438			error = "No buffer space available.";
439			break;
440			case WSAENOPROTOOPT:
441			error = "Bad protocol option.";
442			break;
443			case WSAENOTCONN:
444			error = "Socket is not connected.";
445			break;
446			case WSAENOTSOCK:
447			error = "Socket operation on non-socket.";
448			break;
449			case WSAEOPNOTSUPP:
450			error = "Operation not supported.";
451			break;
452			case WSAEPFNOSUPPORT:
453			error = "Protocol family not supported.";
454			break;
455			case WSAEPROCLIM:
456			error = "Too many processes.";
457			break;
458			case WSAEPROTONOSUPPORT:
459			error = "Protocol not supported.";
460			break;
461			case WSAEPROTOTYPE:
462			error = "Protocol wrong type for socket.";
463			break;
464			case WSAESHUTDOWN:
465			error = "Cannot send after socket shutdown.";
466			break;
467			case WSAESOCKTNOSUPPORT:
468			error = "Socket type not supported.";
469			break;
470			case WSAETIMEDOUT:
471			error = "Connection timed out.";
472			break;
473			case WSATYPE_NOT_FOUND:
474			error = "Class type not found.";
475			break;
476			case WSAEWOULDBLOCK:
477			error = "Resource temporarily unavailable.";
478			break;
479			case WSAHOST_NOT_FOUND:
480			error = "Host not found.";
481			break;
482			case WSA_INVALID_HANDLE:
483			error = "Specified event object handle is invalid.";
484			break;
485			case WSA_INVALID_PARAMETER:
486			error = "One or more parameters are invalid.";
487			break;
488			// case WSAINVALIDPROCTABLE:
489			// error = "Invalid procedure table from service provider.";
490			// break;
491			// case WSAINVALIDPROVIDER:
492			// error = "Invalid service provider version number.";
493			// break;
494			case WSA_IO_INCOMPLETE:
495			error = "Overlapped I/O event object not in signaled state.";
496			break;
497			case WSA_IO_PENDING:
498			error = "Overlapped operations will complete later.";
499			break;
500			case WSA_NOT_ENOUGH_MEMORY:
501			error = "Insufficient memory available.";
502			break;
503			case WSANOTINITIALISED:
504			error = "Successful WSAStartup not yet performed.";
505			break;
506			case WSANO_DATA:
507			error = "Valid name, no data record of requested type.";
508			break;
509			case WSANO_RECOVERY:
510			error = "This is a non-recoverable error.";
511			break;
512			// case WSAPROVIDERFAILEDINIT:
513			// error = "Unable to initialize a service provider.";
514			// break;
515			case WSASYSCALLFAILURE:
516			error = "System call failure.";
517			break;
518			case WSASYSNOTREADY:
519			error = "Network subsystem is unavailable.";
520			break;
521			case WSATRY_AGAIN:
522			error = "Non-authoritative host not found.";
523			break;
524			case WSAVERNOTSUPPORTED:
525			error = "WINSOCK.DLL version out of range.";
526			break;
527			case WSAEDISCON:
528			error = "Graceful shutdown in progress.";
529			break;
530			case WSA_OPERATION_ABORTED:
531			error = "Overlapped operation aborted.";
532			break;
533			default:
534			error = "Unknown error.";
535			break;
536			}
537	douglas	1
538	douglas	13	cerr << prefix << ": " << error << "\n";
539			#else
540			if (host)
541			{
542			herror(prefix.c_str());
543	douglas	1	}
544			else
545			{
546	douglas	13	perror(prefix.c_str());
547	douglas	1	}
548	douglas	13	#endif // _WIN32
549			}