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Old 01-20-2006, 07:57 PM   #1
AmigaEd
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Default Example of C source code for getting web page.

Hello,
I'm trying to learn C and I am wondering if someone out there might have a very simple example of some C source code that will grab a web page and display it or even just save it as a file.

I've looked at a few programs on aminet, but I can't seem to make sense out of them.

Thank you,
AmigaEd
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Old 01-20-2006, 08:05 PM   #2
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Default Re: Example of C source code for getting web page.

Quote:
AmigaEd wrote:
Hello,
I'm trying to learn C and I am wondering if someone out there might have a very simple example of some C source code that will grab a web page and display it or even just save it as a file.

I've looked at a few programs on aminet, but I can't seem to make sense out of them.

Thank you,
AmigaEd
This isnt too bad achttp://www.google.com/search?hl=en&q=software+hut&btnG=Google+Searchtual ly. Learn your tcp library. All you have to do is issue one simple string. something like "GET HTTP 1.0 /" <cr><cr>

then the web server simply spits back the result.

so it goes like this:

create socket
set sock addr
set sock port
open socket
send socket ( request_string )
receive result

then write the input uffer to standard output or to a file, what ever

obviously the libs are different for every os

check out the rfc for http for more detial on what you can do with it http://www.faqs.org/rfcs/rfc2616.html

sorry i cant help you with the tcp stuff on amiga, as i have never used socket library on amigaos.


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Old 01-20-2006, 08:53 PM   #3
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Default Re: Example of C source code for getting web page.

Ive written a simple program that does what you are talking about, for linux. Theres still a small problem with it though, compiler is telling me that it doesnt know the size for socket_detials....

Code:
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

int main ( void ) {
        int socket_handle ;
        struct sockaddr_in socket_detials ;
        char * input_buffer;
        char * httpget = "GET HTTP 1.1 / \r\r" ;

        input_buffer = malloc(20000);

        socket_handle = socket ( AF_INET, SOCK_STREAM, 0) ;
        socket_detials.sin_family = AF_INET ;
        socket_detials.sin_addr.s_addr=inet_addr("68.90.68.66");
        socket_detials.sin_port = htons(80);

        connect (socket_handle,(struct sockaddr*)&socket_detials, sizeof ( struct sockaddr));
        send ( socket_handle , httpget, strlen(httpget), 0 ) ;
        recv ( socket_handle , input_buffer , 20000, 0 ) ;
        printf ( "%s\n", input_buffer ) ;

        return 0 ;
}
you may want to check out the simple socket library from http://mysite.verizon.net/astronaut/ssl/

It supports a lot of os's and i seem to remember saying it supported amiga... Socket programming with training wheels
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Old 01-20-2006, 08:59 PM   #4
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Default Re: Example of C source code for getting web page.

Quote:
by koaftder on 2006/1/20 22:05:10
This isnt too bad achttp://www.google.com/search?hl=en...+Searchtually. Learn your tcp library. All you have to do is issue one simple string. something like "GET HTTP 1.0 /" <cr><cr>
Hi koaftder,
The link you posted seems to take me to a bunch of links to software hut on google.

Can you please post the link again or point me to the correct site.

Thank you,
AmigaEd



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Old 01-20-2006, 09:04 PM   #5
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Default Re: Example of C source code for getting web page.

Quote:
AmigaEd wrote:
Quote:
by koaftder on 2006/1/20 22:05:10
This isnt too bad achttp://www.google.com/search?hl=en...+Searchtually. Learn your tcp library. All you have to do is issue one simple string. something like "GET HTTP 1.0 /" <cr><cr>
Hi koaftder,
The link you posted seems to take me to a bunch of links to software hut on google.

Can you please post the link again or point me to the correct site.

Thank you,
AmigaEd


Sorry ): i must have hit paste when i typed that. Only link i meant to post on that comment was http://www.faqs.org/rfcs/rfc2616.html for the http protocol specification. I was on the hunt for zip ram, i figure if i cant figure out which order they need to be piled up in the sockets, i'll just fill up every socket.
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Old 01-20-2006, 09:21 PM   #6
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Default Re: Example of C source code for getting web page.

"Ive written a simple program that does what you are talking about, for linux. Theres still a small problem with it though, compiler is telling me that it doesnt know the size for socket_detials...."

Shouldn't that be socket_details ? Maybe that's why it doesn't know the size, incorrect syntax? Not sure, just guessing... Looked like a typo, and I ran it through some search engines to check, got 0 hits - there are relevent tcp texts mentioning what I listed though.. Just curious.
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Old 01-20-2006, 09:32 PM   #7
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Default Re: Example of C source code for getting web page.

Quote:
koaftder wrote:

you may want to check out the simple socket library from http://mysite.verizon.net/astronaut/ssl/

It supports a lot of os's and i seem to remember saying it supported amiga... Socket programming with training wheels
The word "Amiga" does not exist on that site.

I cannot find any evidence that it has ever been ported to AmigaOS.

Have you personally used Simple Socket Library?
Is it reliable?
Does it limit you in some way?
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Old 01-20-2006, 09:34 PM   #8
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Default Re: Example of C source code for getting web page.

The request-string should be "GET / HTTP/1.0\r\n\r\n" to get the default page. For another page "GET /somedir/somefile.html HTTP/1.0\r\n\r\n". This will make the HTTP-server respond with a header and then the content.

The easiest way to get the default page is to skip the HTTP-version and make the request-string just "GET /\r\n". This will make the server assume a HTTP/0.9 client and just send the file without any header before it.

When writing a simple client, I would recommend sending "HTTP/1.0" as version, because then you will get the header plus have the possibility to support virtual hosts (which almost all webservers use to share many sites on one the same ip-adress), but not have to support chunked transfer mode.

For example this site requires the client to tell what site he is referring to, as the server is using virtual hosts to host several sites. A request to get the default page of amiga.org would look like this:
Code:
GET / HTTP/1.0\r\n
Host: amiga.org\r\n\r\n
Without supplying the "Host: amiga.org"-line, the webserver wont know what site you are asking for and will return some default page - try entering the ip-adress for amiga.org in a browser and see what happens then.

\r = Carriage Return (CR = 0x0D)
\n = Line Feed (LF = 0x0A)

This page, when working, has some rather good information.

(edit): Removed errors.


/Patrik
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Old 01-20-2006, 09:40 PM   #9
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Default Re: Example of C source code for getting web page.

ok, finally got my code to work
Code:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

int main ( void ) {
        int socket_handle ;
        struct sockaddr_in socket_detials ;
        char * input_buffer;
        char * httpget = "GET HTTP 1.1 / \x0D\x0A\n\x0D\x0A\n" ;

        input_buffer = malloc(20000);

        socket_handle = socket ( AF_INET, SOCK_STREAM, 0) ;
        socket_detials.sin_family = AF_INET ;
        socket_detials.sin_addr.s_addr=inet_addr("68.90.68.66");
        socket_detials.sin_port = htons(80);
        bzero ( &(socket_detials.sin_zero), 8 ) ;

        if ( connect (socket_handle,(struct sockaddr*)&socket_detials, sizeof ( struct sockaddr)) == -1 ){
                printf ( "Couldnt connect to server\n" ) ;
        }
        printf ( "Sending %d bytes\n",  send ( socket_handle , httpget, strlen(httpget), 0 ) ) ;
        printf ( "Received %d bytes\n", recv ( socket_handle , input_buffer , 20000, 0 ) ) ;
        printf ( "%s\n", input_buffer ) ;

        return 0 ;
}
and when i run it i get :

Code:
koft@macdev:~$ ./socket
Sending 21 bytes
Received 658 bytes
HTTP/1.1 400 Bad Request
Date: Sat, 21 Jan 2006 04:37:48 GMT
Server: Apache/1.3.34 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 PHP/4.4.1 FrontPage/5.0.2.2635 mod_ssl/2.8.25 OpenSSL/0.9.7a
Connection: close
Content-Type: text/html; charset=iso-8859-1

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML><HEAD>
<TITLE>400 Bad Request</TITLE>
</HEAD><BODY>
<H1>Bad Request</H1>
Your browser sent a request that this server could not understand.<P>
The request line contained invalid characters following the protocol string.<P>
<P>
<HR>
<ADDRESS>Apache/1.3.34 Server at cpanel1.betterbox.net Port 80</ADDRESS>
</BODY></HTML>

koft@macdev:~$
Tip, when things arent working, use ethereal to view your traffic. I spent some time watching the program hang because i wasnt sending it the right stuff after the get. ( i tried 0d0a0d0a but that didnt do it.... ) I wasnt even sure it actually send the packet to the server, or at the right address or port, untill i fired up ethereal and saw for sure what was really going on.
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Old 01-20-2006, 09:44 PM   #10
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Default Re: Example of C source code for getting web page.

@koaftder:

The reason why you are getting a "400 Bad Request" response is because you are specifying that your client is a HTTP/1.1 client, which requires you to supply the "Host: something.com" header-line, which is optional in HTTP/1.0, but required for virtual hosts to work, so it is definately recommended to supply it anyhow.

With a simple client, there is no advantage in telling the server that your client supports HTTP/1.1 instead of HTTP/1.0, rather disadvantages as then the server is allowed to send you dynamic pages as chunks using the so called "chunked transfer-coding".


/Patrik
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Old 01-20-2006, 10:17 PM   #11
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Default Re: Example of C source code for getting web page.

Quote:
patrik wrote:
@koaftder:

The reason why you are getting a "400 Bad Request" response is because you are specifying that your client is a HTTP/1.1 client, which requires you to supply the "Host: something.com" header-line, which is optional in HTTP/1.0, but required for virtual hosts to work, so it is definately recommended to supply it anyhow.

With a simple client, there is no advantage in telling the server that your client supports HTTP/1.1 instead of HTTP/1.0, rather disadvantages as then the server is allowed to send you dynamic pages as chunks using the so called "chunked transfer-coding".


/Patrik
ok, so i will just capture what fire fox sends out when i goto amiga.org, here is the fix :-)

Code:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

int main ( void ) {
        int socket_handle ;
        struct sockaddr_in socket_detials ;
        char * input_buffer;
        char * httpget =

          "GET / HTTP/1.1\r\n"
          "Host: www.amiga.org\r\n"
          "User-Agent: Mozilla/5.0 (X11; U; Linux ppc; en-US; rv:1.7.10) Gecko/20050825 Firefox/1.0.6 (Ubuntu package 1.0.6)\r\n"
          "Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\r\n"
          "Accept-Language: en-us,en;q=0.5\r\n"
          "Accept-Encoding: gzip,deflate\r\n"
          "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n"
          "Keep-Alive: 300\r\n"
          "Connection: keep-alive\r\n"
          "Referer: http://www.amiga.org/gallery/index.php?n=896=33\r\n"
          "Cookie: PHPSESSID=442105507b7dca6d4042a641fc132c8f; AO_Session=442105507b7dca6d4042a641fc132c8f\r\n"
          "Cache-Control: max-age=0\r\n"
          "\r\n";

        input_buffer = malloc(20000);

        socket_handle = socket ( AF_INET, SOCK_STREAM, 0) ;
        socket_detials.sin_family = AF_INET ;
        socket_detials.sin_addr.s_addr=inet_addr("68.90.68.66");
        socket_detials.sin_port = htons(80);
        bzero ( &(socket_detials.sin_zero), 8 ) ;

        if ( connect (socket_handle,(struct sockaddr*)&socket_detials, sizeof ( struct sockaddr)) == -1 ){
                printf ( "Couldnt connect to server\n" ) ;
        }
        printf ( "Sending %d bytes\n",  send ( socket_handle , httpget, strlen(httpget), 0 ) ) ;
        printf ( "Received %d bytes\n", recv ( socket_handle , input_buffer , 20000, 0 ) ) ;
        printf ( "%s\n", input_buffer ) ;

        return 0 ;
}
and it returns the following now:

Code:
koft@macdev:~$ ./socket
Sending 612 bytes
Received 1460 bytes
HTTP/1.1 200 OK
Date: Sat, 21 Jan 2006 05:03:13 GMT
Server: Apache/1.3.34 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 PHP/4.4.1 FrontPage/5.0.2.2635 mod_ssl/2.8.25 OpenSSL/0.9.7a
X-Powered-By: PHP/4.4.1
Set-Cookie: PHPSESSID=442105507b7dca6d4042a641fc132c8f; path=/
Expires: Mon, 26 Jul 1997 05:00:00 GMT
Cache-Control: private, no-cache
Pragma: no-cache
Set-Cookie: AO_Session=442105507b7dca6d4042a641fc132c8f; expires=Saturday, 28-Jan-06 05:03:14 GMT; path=/
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=ISO-8859-1

d19
<!DOCTYPE html public "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="content-language" content="en">
<meta name="robots" content="index,follow">
<meta name="keywords" content="Amiga, commodore, Wayne Hunt, Amiga.org, computing, multimedia, gaming, games, desktop, video, Toaster, flyer, Power PC, ppc, Motorola, AmigaDE, Digital, Environment, AmigaOS, MorphOS, Pegasos, Barkanoid 2, No Gravity, Crimson Fields, c=, Jay Miner, Carl Sassenrath, 1985, 68k, 68000, 68010, 68020, 68030, 68040, 68050, 68060, Bill McEwen, Fleecy Moss, Gary Peake, Paula, Denise, Agnes, Eric Schwartz, Sabrina Online, music mod, mp3, ugn, user group, news, events, forum, tech support, eyetech, 600, 1000, 1200, 2000, 3000, 3000T, 4000, 500, emulator, U
Code:
koft@macdev:~$
i broke up one of thoes lines because it was annoying

Writing network code can be a lot of fun, though it can be a major undertaking if you have to write something more than some hacks for a hobby project.

I have a few books about socket programming for windows and linux, they cover a lot of material but dont seem to dig into some detials i'd like to fill in without having to experiment for years and write mountians of code. Multithreaded socket programming comes into mind, most books seem to skirt around the subject. If i'm writing a server daemon for something, i'm going to need to handle a lot of simultaneous connections. Do i use blocking or non blocking sockets? Do i spawn off a thread for each socket, and make it a blocking socket? Should i spawn of a thread for every 10 sockets and do non blocking io? Should i fork the daemon 5 times and load balance the connections accross the processes? How do i effectively deal with resource starvation caused by jerks who write scripts that keep opening hundreds of connections and letting them hang? Thoes are the topics i'd like to see covered in a book, performance strategies and security issues. I really really dont have time to read all the socket code for apache.
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Old 01-20-2006, 10:39 PM   #12
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Default Re: Example of C source code for getting web page.

Quote:
by ChaosLord on 2006/1/20 23:32:26
The word "Amiga" does not exist on that site.
I agree I looked that site all over and could find no reference to "Amiga".

I really need some code that I can compile and run on an Amiga. Linux is just not an option for me right now.

Best Regards,
AmigaEd
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Old 01-20-2006, 10:45 PM   #13
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Default Re: Example of C source code for getting web page.

@koaftder:

Dude, no need to send so much! Check my earlier example for amiga.org, which is the only stuff you need to send and should send to make it work with all servers plus make it as easy as possible for you when coding a client. If you dont advertise that your client supports wierd encodings and transfer modes, the server wont utilize such.

This page is rather good regarding what pitfalls there are when designing high performance server software.


/Patrik
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Old 01-20-2006, 11:35 PM   #14
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Default Re: Example of C source code for getting web page.

@AmigaEd:

If targetting for the Amiga, you should take a look at the AmiTCP-SDK which gives you the necessary headers to work with bsdsocket.library (also link-libraries that can do some misc stuff for you, but they are not needed) which is the standard implementation of the BSD sockets API amongst Amiga TCP/IP stacks.

Using bsdsocket.library is not hard, you need to add the AmiTCP-SDKs in your include-path and include <bsdsocket.h>, <netdb.h> and <proto/socket.h>. Its like using any other shared library - you can utilize its functions after opening it with exec.library/OpenLibrary(). After that, it is more or less identical to programming the BSD sockets API, as far as the networking is concerned.

There are also some examples with the AmiTCP-SDK, even a small HTTP/GET client. If you are new to C, they might not be too straightforward though.


/Patrik
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Old 01-20-2006, 11:36 PM   #15
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Default Re: Example of C source code for getting web page.

@patrik

You are right about the extraneous stuff i had put in there. I just wanted to demonstrate the connection and retrieving some stuff, no need to confuse people.

That document you pointed out is a wonderful read.

@AmigaEd

Sorry to point you off into a wrong direction. I grabbed the package and sure enough, doesnt support amiga ): It's a really nice easy lib to work with. It supported dos/windows/os2/unix/linux/vms, etc. I guess i just thought it ran on amiga cause the guy who wrote it is a nasa geek and everybody seems to mention about how much amiga was used in that organisation.
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Old 01-21-2006, 05:37 AM   #16
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Default Re: Example of C source code for getting web page.

"If targetting for the Amiga, you should take a look at the AmiTCP-SDK which gives you the necessary headers to work with bsdsocket.library (also link-libraries that can do some misc stuff for you, but they are not needed) which is the standard implementation of the BSD sockets API amongst Amiga TCP/IP stacks."

Even Roadshow ?
I'm asking this cause I'm planning on learning some network stuff too. About a year I got a book from Uni's library on networking but got completely let down by the amount of all the different protocols. I guess one doesn't need to know TCP/IP to do some basic network coding, only if I was to do my own stack. But since many hacks one see desbribed on the net imply some TCP/IP knowledge I'd like to learn it to understand it 8-)
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Old 01-21-2006, 05:45 AM   #17
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Default Re: Example of C source code for getting web page.

@koaftder,
Hey no problem, no need to be sorry. All of the information that you have posted has been very helpful and I'm sure that eventually I will also give this a try on windoze or unix (for work purposes of course ) ;-)

Best Regards,
AmigaEd
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Old 01-21-2006, 06:08 AM   #18
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Default Re: Example of C source code for getting web page.

@Jose:

Yes, all TCP/IP-stacks on the Amiga, except the obselete AS225, gives you access through bsdsocket.library, even Roadshow - else no existing network applications would work with it.

It is always good to have atleast some knowledge about the protocols you are going to use. Not necessary all the nitty gritty details, but it will give you a much better understanding of how to create applications that are suited for them if you have a fair amount of knowledge about how they work, what their strongpoints and drawbacks are, etc.


/Patrik
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Old 01-21-2006, 08:08 AM   #19
Piru
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Default Re: Example of C source code for getting web page.

@koaftder

Bugs:

- You don't check if malloc() fails, but just crash if it does.
- You don't check if socket() fails, but just continue instead.
- bzero ( &(socket_detials.sin_zero), 8 ) ; is wrong. It assumes knowlege of the struct sockaddr_in, which can be different between platforms. Typecally it is 8 though, but there is no guarantee of this.
- You don't bail out if connect() fails, but just continue.
- You don't check if send() succeeds.
- You don't check how much data you manage to recv().
- You limit the recv size to 20000 bytes. If more data would be available you just truncate input.
- There is no guarantee single recv() will get all the input at once. You might get just the header for the 1st call, or part of the header. You should call recv() till -1 (error) or 0 (eof) is returned.
- You printf %s the input buffer, even though it is not '\0' terminated.
- Sending fixed cookies will not work. Esp PHPSESSID will just fail once the session id has expired.
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Old 01-21-2006, 09:03 AM   #20
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Default Re: Example of C source code for getting web page.

Nothing gets past Piru. :-D
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