Skip to content

Instantly share code, notes, and snippets.

@berlinbrown

berlinbrown/gist:4583728

Created January 21, 2013 05:05
Show Gist options
  • Save berlinbrown/4583728 to your computer and use it in GitHub Desktop.
Save berlinbrown/4583728 to your computer and use it in GitHub Desktop.
Download ZIP
Simplest Possible Web Crawler with C++
Raw
gistfile1.cpp
//============================================================================
// Name : OctaneCrawler.cpp
// Author : Berlin Brown (berlin dot brown at gmail.com)
// Version :
// Copyright : Copyright Berlin Brown 2012-2013
// License : BSD
// Description : This is the simplest possible web crawler in C++
// Uses boost_regex and boost_algorithm
//============================================================================
#include <iostream>
#include <string>
#include <typeinfo>
#include <cstdarg>
#include <iostream>
#include <fstream>
#include <boost/regex.hpp>
#include <boost/algorithm/string.hpp>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
using namespace std;
using namespace boost;
const int DELAY = 12;
const int MAXRECV = 140 * 1024;
const std::string WRITE_DIR_PATH = "/home/bbrown/public/example.com/public/octane_bot_store";
class WebPage {
public:
std::string hostname;
std::string page;
WebPage() {
hostname = "";
page = "";
}
std::string parseHttp(const std::string str) {
const boost::regex re("(?i)http://(.*)/?(.*)");
boost::smatch what;
if (boost::regex_match(str, what, re)) {
std::string hst = what[1];
boost::algorithm::to_lower(hst);
return hst;
}
return "";
} // End of method //
void parseHref(const std::string orig_host, const std::string str) {
const boost::regex re("(?i)http://(.*)/(.*)");
boost::smatch what;
if (boost::regex_match(str, what, re)) {
// We found a full URL, parse out the 'hostname'
// Then parse out the page
hostname = what[1];
boost::algorithm::to_lower(hostname);
page = what[2];
} else {
// We could not find the 'page' but we can build the hostname
hostname = orig_host;
page = "";
} // End of the if - else //
} // End of method //
void parse(const std::string orig_host, const std::string hrf) {
const std::string hst = parseHttp(hrf);
if (!hst.empty()) {
// If we have a HTTP prefix
// We could end up with a 'hostname' and page
parseHref(hst, hrf);
} else {
hostname = orig_host;
page = hrf;
}
// hostname and page are constructed,
// perform post analysis
if (page.length() == 0) {
page = "/";
} // End of the if //
} // End of the method
}; // End of the class
std::string string_format(const std::string &fmt, ...) {
int size = 255;
std::string str;
va_list ap;
while (1) {
str.resize(size);
va_start(ap, fmt);
int n = vsnprintf((char *) str.c_str(), size, fmt.c_str(), ap);
va_end(ap);
if (n > -1 && n < size) {
str.resize(n);
return str;
}
if (n > -1)
size = n + 1;
else
size *= 2;
} // End of the while //
return str;
} // End of the function //
std::string request(std::string host, std::string path) {
std::string request = "GET ";
request.append(path);
request.append(" HTTP/1.1\r\n");
request.append("Host: ");
request.append(host);
request.append("\r\n");
request.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.81\r\n");
request.append("User-Agent: Mozilla/5.0 (compatible; octanebot/1.0; http://code.google.com/p/octane-crawler/)\r\n");
request.append("Connection: close\r\n");
request.append("\r\n");
return request;
} // End of the function //
std::string clean_href(const std::string host, const std::string path) {
// Clean the href to save to file //
std::string full_url = host;
full_url.append("/");
full_url.append(path);
const boost::regex rmv_all("[^a-zA-Z0-9]");
const std::string s2 = boost::regex_replace(full_url, rmv_all, "_");
cout << s2 << endl;
return s2;
}
int connect(const std::string host, const std::string path) {
const int port = 80;
// Setup the msock
int m_sock;
sockaddr_in m_addr;
memset(&m_addr, 0, sizeof(m_addr));
m_sock = socket(AF_INET, SOCK_STREAM, 0);
int on = 1;
if (setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, (const char*) &on, sizeof(on)) == -1) {
return false;
}
// Connect //
m_addr.sin_family = AF_INET;
m_addr.sin_port = htons(port);
int status = inet_pton(AF_INET, host.c_str(), &m_addr.sin_addr);
if (errno == EAFNOSUPPORT) {
return false;
}
status = ::connect(m_sock, (sockaddr *) &m_addr, sizeof(m_addr));
// HTTP/1.1 defines the "close" connection option for
// the sender to signal that the connection will be closed
// after completion of the response.
std::string req = request(host, path);
// End of building the request //
status = ::send(m_sock, req.c_str(), req.size(), MSG_NOSIGNAL);
char buf[MAXRECV];
cout << "Request: " << req << endl;
cout << "=========================" << endl;
std::string recv = "";
while (status != 0) {
memset(buf, 0, MAXRECV);
status = ::recv(m_sock, buf, MAXRECV, 0);
recv.append(buf);
} // End of the while //
cout << "Response:" << recv << endl;
cout << "---------------------------" << endl;
// Attempt to write to file //
const std::string html_file_write = string_format("%s/%s", WRITE_DIR_PATH.c_str(), clean_href(host, path).c_str());
cout << "Writing to file : " << html_file_write << endl;
ofstream outfile(html_file_write.c_str());
outfile << recv << endl;
outfile.close();
// Parse the data //
try {
const boost::regex rmv_all("[\\r|\\n]");
const std::string s2 = boost::regex_replace(recv, rmv_all, "");
const std::string s = s2;
// Use this regex expression, allow for mixed-case
// Search for the anchor tag but not the '>'
// Where (.+?) match anything
//const boost::regex re("<a([^>]+) href='(.+?)'>");
const boost::regex re("<a\\s+href\\s*=\\s*(\"([^\"]*)\")|('([^']*)')\\s*>");
boost::cmatch matches;
// Using token iterator with sub-matches
const int subs[] = { 2, 4 };
boost::sregex_token_iterator i(s.begin(), s.end(), re, subs);
boost::sregex_token_iterator j;
for (; i != j; i++) {
// Iterate through the listed HREFs and
// move to next request //
const std::string href = *i;
if (href.length() != 0) {
WebPage* page = new WebPage();
page->parse(host, href);
const char* hrefc = page->page.c_str();
cout << "Connecting to HTTP server with : " << page->hostname << " page=" << hrefc << endl;
sleep(DELAY);
connect(page->hostname, string_format("/%s", hrefc));
delete page;
} // End of the if ///
} // End of the for //
} catch (boost::regex_error& e) {
cout << "Error: " << e.what() << "\n";
} // End of the try - catch //
return 1;
} // End of the function //
int main() {
cout << "Launching program" << endl;
connect("localhost", "/");
cout << "Done" << endl;
return 0;
} // End of the function //
@abhimanyu1310
Copy link

Please also mention how to compile this code ?

@go-ive
Copy link

go-ive commented Jan 29, 2015

I found a solution how to compile it:

You need libboost installed (on linux mint 17: sudo apt-get install libboost-all-dev). You don't need all packages, but it also doesn't hurt. Then run "g++ main.cpp -lboost_regex".

@gauravsinha7
Copy link

the connection is not getting established . What to do ?

@Dvdhyh
Copy link

Dvdhyh commented May 29, 2016 •
edited
Loading

For Window users add the following

include winsock2.h

include WS2tcpip.h

include conio.h //Sleep

pragma comment(lib, "ws2_32.lib")

A small note
int connect(const std::string host, const std::string path) This is one of the custom functions.
The function connect(), inside of it he also calls the built-in function called connect()

@ohhmm
Copy link

ohhmm commented Mar 19, 2017

consider using boost::asio

@gamenite
Copy link

gamenite commented Apr 7, 2020 •
edited
Loading

remove boost

//============================================================================
// Name        : OctaneCrawler.cpp
// Author      : Berlin Brown (berlin dot brown at gmail.com)
// Version     :
// Copyright   : Copyright Berlin Brown 2012-2013
// License     : BSD
// Description : This is the simplest possible web crawler in C++
//               Uses boost_regex and boost_algorithm
//============================================================================

#include <iostream>
#include <string>
#include <typeinfo>
#include <cstdarg>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <regex>

// #include <boost/regex.hpp>
// #include <boost/algorithm/string.hpp>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>

using namespace std;
// using namespace boost;

const int DELAY = 12;
const int MAXRECV = 140 * 1024;
const std::string WRITE_DIR_PATH = "/home/bbrown/public/example.com/public/octane_bot_store";

class WebPage {
public:
    std::string hostname;
    std::string page;

    WebPage() {
        hostname = "";
        page = "";
    }

    std::string parseHttp(const std::string str) {
        const regex re("(?i)http://(.*)/?(.*)");
        smatch what;
        if (regex_match(str, what, re)) {
            std::string hst = what[1];
            for_each(hst.begin(),hst.end(),[](char& c){c=tolower(c);});
            return hst;
        }
        return "";
    } // End of method //

    void parseHref(const std::string orig_host, const std::string str) {
        const regex re("(?i)http://(.*)/(.*)");
        smatch what;
        if (regex_match(str, what, re)) {
            // We found a full URL, parse out the 'hostname'
            // Then parse out the page
            hostname = what[1];
            for_each(hostname.begin(),hostname.end(),[](char& c){c=tolower(c);});

            page = what[2];
        } else {
            // We could not find the 'page' but we can build the hostname
            hostname = orig_host;
            page = "";
        } // End of the if - else //
    } // End of method //

    void parse(const std::string orig_host, const std::string hrf) {
        const std::string hst = parseHttp(hrf);
        if (!hst.empty()) {
            // If we have a HTTP prefix
            // We could end up with a 'hostname' and page
            parseHref(hst, hrf);
        } else {
            hostname = orig_host;
            page = hrf;
        }
        // hostname and page are constructed,
        // perform post analysis
        if (page.length() == 0) {
            page = "/";
        } // End of the if //
    } // End of the method
}; // End of the class

std::string string_format(const std::string &fmt, ...) {
    int size = 255;
    std::string str;
    va_list ap;
    while (1) {
        str.resize(size);
        va_start(ap, fmt);
        int n = vsnprintf((char *) str.c_str(), size, fmt.c_str(), ap);
        va_end(ap);
        if (n > -1 && n < size) {
            str.resize(n);
            return str;
        }
        if (n > -1)
            size = n + 1;
        else
            size *= 2;
    } // End of the while //
    return str;
} // End of the function //

std::string request(std::string host, std::string path) {
    std::string request = "GET ";
    request.append(path);
    request.append(" HTTP/1.1\r\n");
    request.append("Host: ");
    request.append(host);
    request.append("\r\n");
    request.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.81\r\n");
    request.append("User-Agent: Mozilla/5.0 (compatible; octanebot/1.0; http://code.google.com/p/octane-crawler/)\r\n");
    request.append("Connection: close\r\n");
    request.append("\r\n");
    return request;
} // End of the function //

std::string clean_href(const std::string host, const std::string path) {
    // Clean the href to save to file //
    std::string full_url = host;
    full_url.append("/");
    full_url.append(path);
    const regex rmv_all("[^a-zA-Z0-9]");
    const std::string s2 = regex_replace(full_url, rmv_all, "_");
    cout << s2 << endl;
    return s2;
}

int connect(const std::string host, const std::string path) {
    const int port = 80;

    // Setup the msock
    int m_sock;
    sockaddr_in m_addr;
    memset(&m_addr, 0, sizeof(m_addr));
    m_sock = socket(AF_INET, SOCK_STREAM, 0);

    int on = 1;
    if (setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, (const char*) &on, sizeof(on)) == -1) {
        return false;
    }

    // Connect //
    m_addr.sin_family = AF_INET;
    m_addr.sin_port = htons(port);
    int status = inet_pton(AF_INET, host.c_str(), &m_addr.sin_addr);

    if (errno == EAFNOSUPPORT) {
        return false;
    }
    status = ::connect(m_sock, (sockaddr *) &m_addr, sizeof(m_addr));

    // HTTP/1.1 defines the "close" connection option for
    // the sender to signal that the connection will be closed
    // after completion of the response.
    std::string req = request(host, path);
    // End of building the request //

    status = ::send(m_sock, req.c_str(), req.size(), MSG_NOSIGNAL);
    char buf[MAXRECV];

    cout << "Request: " << req << endl;
    cout << "=========================" << endl;

    std::string recv = "";
    while (status != 0) {
        memset(buf, 0, MAXRECV);
        status = ::recv(m_sock, buf, MAXRECV, 0);
        recv.append(buf);
    } // End of the while //
    cout << "Response:" << recv << endl;
    cout << "---------------------------" << endl;

    // Attempt to write to file //
    const std::string html_file_write = string_format("%s/%s", WRITE_DIR_PATH.c_str(), clean_href(host, path).c_str());
    cout << "Writing to file : " << html_file_write << endl;
    ofstream outfile(html_file_write.c_str());
    outfile << recv << endl;
    outfile.close();

    // Parse the data //
    try {
        const regex rmv_all("[\\r|\\n]");
        const std::string s2 = regex_replace(recv, rmv_all, "");
        const std::string s = s2;
        // Use this regex expression, allow for mixed-case
        // Search for the anchor tag but not the '>'
        // Where (.+?) match anything
        //const regex re("<a([^>]+) href='(.+?)'>");
        const regex re("<a\\s+href\\s*=\\s*(\"([^\"]*)\")|('([^']*)')\\s*>");
        cmatch matches;
        // Using token iterator with sub-matches
        const int subs[] = { 2, 4 };
        sregex_token_iterator i(s.begin(), s.end(), re, subs);
        sregex_token_iterator j;
        for (; i != j; i++) {
            // Iterate through the listed HREFs and
            // move to next request //
            const std::string href = *i;
            if (href.length() != 0) {
                WebPage* page = new WebPage();
                page->parse(host, href);
                const char* hrefc = page->page.c_str();
                cout << "Connecting to HTTP server with : " << page->hostname << " page=" << hrefc  << endl;
                sleep(DELAY);
                connect(page->hostname, string_format("/%s", hrefc));
                delete page;
            } // End of the if ///
        } // End of the for //
    } catch (regex_error& e) {
        cout << "Error: " << e.what() << "\n";
    } // End of the try - catch //
    return 1;
} // End of the function //

int main() {
    cout << "Launching program" << endl;
    connect("localhost", "/");
    cout << "Done" << endl;
    return 0;
} // End of the function //

@FFC12
Copy link

FFC12 commented Apr 24, 2020

remove boost

//============================================================================
// Name        : OctaneCrawler.cpp
// Author      : Berlin Brown (berlin dot brown at gmail.com)
// Version     :
// Copyright   : Copyright Berlin Brown 2012-2013
// License     : BSD
// Description : This is the simplest possible web crawler in C++
//               Uses boost_regex and boost_algorithm
//============================================================================

#include <iostream>
#include <string>
#include <typeinfo>
#include <cstdarg>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <regex>

// #include <boost/regex.hpp>
// #include <boost/algorithm/string.hpp>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>

using namespace std;
// using namespace boost;

const int DELAY = 12;
const int MAXRECV = 140 * 1024;
const std::string WRITE_DIR_PATH = "/home/bbrown/public/example.com/public/octane_bot_store";

class WebPage {
public:
    std::string hostname;
    std::string page;

    WebPage() {
        hostname = "";
        page = "";
    }

    std::string parseHttp(const std::string str) {
        const regex re("(?i)http://(.*)/?(.*)");
        smatch what;
        if (regex_match(str, what, re)) {
            std::string hst = what[1];
            for_each(hst.begin(),hst.end(),[](char& c){c=tolower(c);});
            return hst;
        }
        return "";
    } // End of method //

    void parseHref(const std::string orig_host, const std::string str) {
        const regex re("(?i)http://(.*)/(.*)");
        smatch what;
        if (regex_match(str, what, re)) {
            // We found a full URL, parse out the 'hostname'
            // Then parse out the page
            hostname = what[1];
            for_each(hostname.begin(),hostname.end(),[](char& c){c=tolower(c);});

            page = what[2];
        } else {
            // We could not find the 'page' but we can build the hostname
            hostname = orig_host;
            page = "";
        } // End of the if - else //
    } // End of method //

    void parse(const std::string orig_host, const std::string hrf) {
        const std::string hst = parseHttp(hrf);
        if (!hst.empty()) {
            // If we have a HTTP prefix
            // We could end up with a 'hostname' and page
            parseHref(hst, hrf);
        } else {
            hostname = orig_host;
            page = hrf;
        }
        // hostname and page are constructed,
        // perform post analysis
        if (page.length() == 0) {
            page = "/";
        } // End of the if //
    } // End of the method
}; // End of the class

std::string string_format(const std::string &fmt, ...) {
    int size = 255;
    std::string str;
    va_list ap;
    while (1) {
        str.resize(size);
        va_start(ap, fmt);
        int n = vsnprintf((char *) str.c_str(), size, fmt.c_str(), ap);
        va_end(ap);
        if (n > -1 && n < size) {
            str.resize(n);
            return str;
        }
        if (n > -1)
            size = n + 1;
        else
            size *= 2;
    } // End of the while //
    return str;
} // End of the function //

std::string request(std::string host, std::string path) {
    std::string request = "GET ";
    request.append(path);
    request.append(" HTTP/1.1\r\n");
    request.append("Host: ");
    request.append(host);
    request.append("\r\n");
    request.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.81\r\n");
    request.append("User-Agent: Mozilla/5.0 (compatible; octanebot/1.0; http://code.google.com/p/octane-crawler/)\r\n");
    request.append("Connection: close\r\n");
    request.append("\r\n");
    return request;
} // End of the function //

std::string clean_href(const std::string host, const std::string path) {
    // Clean the href to save to file //
    std::string full_url = host;
    full_url.append("/");
    full_url.append(path);
    const regex rmv_all("[^a-zA-Z0-9]");
    const std::string s2 = regex_replace(full_url, rmv_all, "_");
    cout << s2 << endl;
    return s2;
}

int connect(const std::string host, const std::string path) {
    const int port = 80;

    // Setup the msock
    int m_sock;
    sockaddr_in m_addr;
    memset(&m_addr, 0, sizeof(m_addr));
    m_sock = socket(AF_INET, SOCK_STREAM, 0);

    int on = 1;
    if (setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, (const char*) &on, sizeof(on)) == -1) {
        return false;
    }

    // Connect //
    m_addr.sin_family = AF_INET;
    m_addr.sin_port = htons(port);
    int status = inet_pton(AF_INET, host.c_str(), &m_addr.sin_addr);

    if (errno == EAFNOSUPPORT) {
        return false;
    }
    status = ::connect(m_sock, (sockaddr *) &m_addr, sizeof(m_addr));

    // HTTP/1.1 defines the "close" connection option for
    // the sender to signal that the connection will be closed
    // after completion of the response.
    std::string req = request(host, path);
    // End of building the request //

    status = ::send(m_sock, req.c_str(), req.size(), MSG_NOSIGNAL);
    char buf[MAXRECV];

    cout << "Request: " << req << endl;
    cout << "=========================" << endl;

    std::string recv = "";
    while (status != 0) {
        memset(buf, 0, MAXRECV);
        status = ::recv(m_sock, buf, MAXRECV, 0);
        recv.append(buf);
    } // End of the while //
    cout << "Response:" << recv << endl;
    cout << "---------------------------" << endl;

    // Attempt to write to file //
    const std::string html_file_write = string_format("%s/%s", WRITE_DIR_PATH.c_str(), clean_href(host, path).c_str());
    cout << "Writing to file : " << html_file_write << endl;
    ofstream outfile(html_file_write.c_str());
    outfile << recv << endl;
    outfile.close();

    // Parse the data //
    try {
        const regex rmv_all("[\\r|\\n]");
        const std::string s2 = regex_replace(recv, rmv_all, "");
        const std::string s = s2;
        // Use this regex expression, allow for mixed-case
        // Search for the anchor tag but not the '>'
        // Where (.+?) match anything
        //const regex re("<a([^>]+) href='(.+?)'>");
        const regex re("<a\\s+href\\s*=\\s*(\"([^\"]*)\")|('([^']*)')\\s*>");
        cmatch matches;
        // Using token iterator with sub-matches
        const int subs[] = { 2, 4 };
        sregex_token_iterator i(s.begin(), s.end(), re, subs);
        sregex_token_iterator j;
        for (; i != j; i++) {
            // Iterate through the listed HREFs and
            // move to next request //
            const std::string href = *i;
            if (href.length() != 0) {
                WebPage* page = new WebPage();
                page->parse(host, href);
                const char* hrefc = page->page.c_str();
                cout << "Connecting to HTTP server with : " << page->hostname << " page=" << hrefc  << endl;
                sleep(DELAY);
                connect(page->hostname, string_format("/%s", hrefc));
                delete page;
            } // End of the if ///
        } // End of the for //
    } catch (regex_error& e) {
        cout << "Error: " << e.what() << "\n";
    } // End of the try - catch //
    return 1;
} // End of the function //

int main() {
    cout << "Launching program" << endl;
    connect("localhost", "/");
    cout << "Done" << endl;
    return 0;
} // End of the function //

+1

@wisdomb
Copy link

wisdomb commented Apr 6, 2021

Hello, please someone help with the

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

headers. I added the glibc-2.33 library, but from 8 errors it gets to 4400 errors. What am I doing wrong?

@M4N0V3Y
Copy link

M4N0V3Y commented Apr 22, 2022

consider using boost::asio

I use boost::asio for that

@liukuo362573
Copy link

liukuo362573 commented May 7, 2022 •
edited
Loading

for windows

#include <winsock2.h>
#include <WS2tcpip.h>
#include <conio.h> //Sleep
#pragma comment(lib, "ws2_32.lib")
#include <iostream>
#include <string>
#include <typeinfo>
#include <cstdarg>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <regex>

// #include <boost/regex.hpp>
// #include <boost/algorithm/string.hpp>

#include <sys/types.h>
//#include <sys/socket.h>
//#include <netinet/in.h>
//#include <arpa/inet.h>

#include <errno.h>
#include <fcntl.h>
//#include <netdb.h>
//#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>

using namespace std;
// using namespace boost;

const int DELAY = 12;
const int MAXRECV = 140 * 1024;
const std::string WRITE_DIR_PATH = "/home/bbrown/public/example.com/public/octane_bot_store";

class WebPage {
public:
	std::string hostname;
	std::string page;

	WebPage() {
		hostname = "";
		page = "";
	}

	std::string parseHttp(const std::string str) {
		const regex re("(?i)http://(.*)/?(.*)");
		smatch what;
		if (regex_match(str, what, re)) {
			std::string hst = what[1];
			for_each(hst.begin(), hst.end(), [](char& c) {c = tolower(c); });
			return hst;
		}
		return "";
	} // End of method //

	void parseHref(const std::string orig_host, const std::string str) {
		const regex re("(?i)http://(.*)/(.*)");
		smatch what;
		if (regex_match(str, what, re)) {
			// We found a full URL, parse out the 'hostname'
			// Then parse out the page
			hostname = what[1];
			for_each(hostname.begin(), hostname.end(), [](char& c) {c = tolower(c); });

			page = what[2];
		}
		else {
			// We could not find the 'page' but we can build the hostname
			hostname = orig_host;
			page = "";
		} // End of the if - else //
	} // End of method //

	void parse(const std::string orig_host, const std::string hrf) {
		const std::string hst = parseHttp(hrf);
		if (!hst.empty()) {
			// If we have a HTTP prefix
			// We could end up with a 'hostname' and page
			parseHref(hst, hrf);
		}
		else {
			hostname = orig_host;
			page = hrf;
		}
		// hostname and page are constructed,
		// perform post analysis
		if (page.length() == 0) {
			page = "/";
		} // End of the if //
	} // End of the method
}; // End of the class

std::string string_format(const std::string& fmt, ...) {
	int size = 255;
	std::string str;
	va_list ap;
	while (1) {
		str.resize(size);
		va_start(ap, fmt);
		int n = vsnprintf((char*)str.c_str(), size, fmt.c_str(), ap);
		va_end(ap);
		if (n > -1 && n < size) {
			str.resize(n);
			return str;
		}
		if (n > -1)
			size = n + 1;
		else
			size *= 2;
	} // End of the while //
	return str;
} // End of the function //

std::string request(std::string host, std::string path) {
	std::string request = "GET ";
	request.append(path);
	request.append(" HTTP/1.1\r\n");
	request.append("Host: ");
	request.append(host);
	request.append("\r\n");
	request.append("Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.81\r\n");
	request.append("User-Agent: Mozilla/5.0 (compatible; octanebot/1.0; http://code.google.com/p/octane-crawler/)\r\n");
	request.append("Connection: close\r\n");
	request.append("\r\n");
	return request;
} // End of the function //

std::string clean_href(const std::string host, const std::string path) {
	// Clean the href to save to file //
	std::string full_url = host;
	full_url.append("/");
	full_url.append(path);
	const regex rmv_all("[^a-zA-Z0-9]");
	const std::string s2 = regex_replace(full_url, rmv_all, "_");
	cout << s2 << endl;
	return s2;
}

int connect(const std::string host, const std::string path) {
	const int port = 80;

	WSADATA WSAData;
	WSAStartup(MAKEWORD(2, 0), &WSAData);
	// Setup the msock
	int m_sock;
	sockaddr_in m_addr;
	memset(&m_addr, 0, sizeof(m_addr));
	m_sock = socket(AF_INET, SOCK_STREAM, 0);

	int on = 1;
	if (setsockopt(m_sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&on, sizeof(on)) == -1) {
		return false;
	}

	// Connect //
	m_addr.sin_family = AF_INET;
	m_addr.sin_port = htons(port);
	int status = inet_pton(AF_INET, host.c_str(), &m_addr.sin_addr);

	if (errno == EAFNOSUPPORT) {
		return false;
	}
	status = ::connect(m_sock, (sockaddr*)&m_addr, sizeof(m_addr));

	// HTTP/1.1 defines the "close" connection option for
	// the sender to signal that the connection will be closed
	// after completion of the response.
	std::string req = request(host, path);
	// End of building the request //

	status = ::send(m_sock, req.c_str(), req.size(), 0);
	char buf[MAXRECV];

	cout << "Request: " << req << endl;
	cout << "=========================" << endl;

	std::string recv = "";
	while (status != 0) {
		memset(buf, 0, MAXRECV);
		status = ::recv(m_sock, buf, MAXRECV, 0);
		recv.append(buf);
	} // End of the while //
	cout << "Response:" << recv << endl;
	cout << "---------------------------" << endl;

	// Attempt to write to file //
	const std::string html_file_write = string_format("%s/%s", WRITE_DIR_PATH.c_str(), clean_href(host, path).c_str());
	cout << "Writing to file : " << html_file_write << endl;
	ofstream outfile(html_file_write.c_str());
	outfile << recv << endl;
	outfile.close();

	// Parse the data //
	try {
		const regex rmv_all("[\\r|\\n]");
		const std::string s2 = regex_replace(recv, rmv_all, "");
		const std::string s = s2;
		// Use this regex expression, allow for mixed-case
		// Search for the anchor tag but not the '>'
		// Where (.+?) match anything
		//const regex re("<a([^>]+) href='(.+?)'>");
		const regex re("<a\\s+href\\s*=\\s*(\"([^\"]*)\")|('([^']*)')\\s*>");
		cmatch matches;
		// Using token iterator with sub-matches
		const int subs[] = { 2, 4 };
		sregex_token_iterator i(s.begin(), s.end(), re, subs);
		sregex_token_iterator j;
		for (; i != j; i++) {
			// Iterate through the listed HREFs and
			// move to next request //
			const std::string href = *i;
			if (href.length() != 0) {
				WebPage* page = new WebPage();
				page->parse(host, href);
				const char* hrefc = page->page.c_str();
				cout << "Connecting to HTTP server with : " << page->hostname << " page=" << hrefc << endl;
				// sleep(DELAY);
				connect(page->hostname, string_format("/%s", hrefc));
				delete page;
			} // End of the if ///
		} // End of the for //
	}
	catch (regex_error& e) {
		cout << "Error: " << e.what() << "\n";
	} // End of the try - catch //
	WSACleanup();
	return 1;
} // End of the function //

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment