C - HTTP Socket Programming Post: 302307509

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Top Forums Programming C - HTTP Socket Programming Post 302307509 by Corona688 on Wednesday 15th of April 2009 02:28:43 PM

04-15-2009

Registered User

Quote:

Originally Posted by kev_1234

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

Could you rephrase that? I'm not sure what you were trying to say.

Quote:

1. Client sends a request to the Server for "GET /index.html HTTP/1.1\r\n\r\n".

Oh, you want to make a web server? The client needs to send() this information over the socket, see man 2 send.

Quote:

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.

This leaves out a whole bunch of steps, which may be why you're stymied.

Accept the connection
Read from it until \r\n\r\n -- recv() cares not about linefeeds, it just gives you chunks of data, so you may need to do a loop reading one character at a time in order to spot when the line ends.
Process the request -- you need to break "GET /index.html HTTP/1.1" into its component parts. You may be able to do this with sscanf():
Code:
```
char code[64], url[512], standard[64];
sscanf(buf, "%s %s %s", code, url, standard);
```
This is a fairly quick-and-dirty solution. A better way may be to use strtok().
Convert /index.html into /path/to/webroot/index.html -- standard C string functions should do here.
Code:
```
char filename[512];
FILE *fp;
strcpy(filename, "/path/to/webroot/");
strcat(filename, webfile);
```

Open the given file, read from it, and send it to the socket

Code:

size_t sent;
char buf[512];
FILE *fp=fopen(filename, "r");
if(fp == NULL)
{
  fprintf(stderr, "Couldn't open %s\n", filename);
  return(1);
}

while( (sent=fread(buf, 512, 1 fp)) > 0)
{
  send(sock, buf, sent, 0);
}

fclose(fp);

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