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C - HTTP Socket Programming

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# 8  
Old 04-14-2009
[quote]
Quote:
Originally Posted by Corona688
Code:
#include <netdb.h>
...
    echoServAddr.sin_family      = AF_INET;             /* Internet address family */
    {
      struct in_addr a;
      struct hostent *h=gethostbyname(servIP);
      if(h == NULL)
        DieWithError("Unknown host");

      memcpy(&a, h->h_addr_list[0], sizeof(a));

      servIP=inet_ntoa(a);
    }
    echoServAddr.sin_addr.s_addr = inet_addr(servIP);   /* Server IP address */
...

After that I can already get limited output from web pages:
Code:
$ ./client mywebsite 'GET /
' 80
Received: 
<!-- Beginning of page_begin() output -->
<html><head>
  <titl
$

Notice the newline at the end of 'GET /', that is necessary.
Oh no I understand clearly what you mean by teaching/learning.....Smilie

The code you gave me earlier is exactly what I am after.......but I would like to extract all the information in the index.html..etc file in html format.

The purely reason for this is to understand how C sockets is able to extract
the dataSmilie
Quote:

Yes, I understand that's what you want to do, I'm wondering what's the sticking point in doing so. Are you having trouble figuring out where in the program logic these things need to be put? Are you trying to figure out how to accept a parameter on the command line? Are the finer points of printf a problem? Or am I off the mark and you need some other information? As is you're asking me to do everything and the idea is to teach...
# 9  
Old 04-14-2009
Quote:
Originally Posted by kev_1234
The purely reason for this is to understand how C sockets is able to extract the dataSmilie
They work much the same as C files, you just read from them. You read data from them with the recv() system call instead of the read() one but it's the same idea. You can see its manual page via 'man recv'.
# 10  
Old 04-14-2009
Quote:
Originally Posted by Corona688
They work much the same as C files, you just read from them. You read data from them with the recv() system call instead of the read() one but it's the same idea. You can see its manual page via 'man recv'.
OkaySmilie

Also in the code below which u posted earlier y does it only extracting the first three lines on the html part? How can it extract the whole content of the html file?

Thanks

Code:
$ ./client mywebsite 'GET /
' 80
Received: 
<!-- Beginning of page_begin() output -->
<html><head>
  <titl
$

# 11  
Old 04-14-2009
recv() is not guaranteed to get all the data at once; the data stream might not have been completely sent yet, or didn't all fit in the buffer you gave it, and so on. Just call recv() again to get more data.
# 12  
Old 04-14-2009
Quote:
Originally Posted by Corona688
recv() is not guaranteed to get all the data at once; the data stream might not have been completely sent yet, or didn't all fit in the buffer you gave it, and so on. Just call recv() again to get more data.
You were right about the buffer......I increased the size from 64 to 500Smilie

It is getting interestingSmilie

So anyways, say if a host has a file called test.html! Could I simply use fprintf(), fopen() etc functions????

Also please guide me as to how I could apply it to my code?
# 13  
Old 04-15-2009
Quote:
Originally Posted by kev_1234
You were right about the buffer......I increased the size from 64 to 500Smilie
If you've only received 64 bytes out of the 5 megabytes in transit, a larger buffer size won't help you. Streams can't tell how much is left to be received. So you still need multiple reads unless you know for a fact exactly how much the other end is sending and when.
Quote:
So anyways, say if a host has a file called test.html! Could I simply use fprintf(), fopen() etc functions?
To do what? You can't open a socket with fopen(), if that's what you mean.
Last edited by Corona688; 04-15-2009 at 02:21 AM..
# 14  
Old 04-15-2009
Ok SIR!Smilie

Well I am not really fussed about how much I get back host as long as I get back some info.Smilie

-----------------------------------------------------------------------

At the moment I can connect to a server as a client.

but how could I acheive the following:

1. Client sends a request to the Server for "GET /index.html HTTP/1.1\r\n\r\n".
2. Server accepts the connection and then sends the requested material back to the client basically dumping the information of index.htmlo on the client.

I am not asking you to post a solution but just for your professional guidance!

Thanks
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