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Using popen() and gunzip() to open file in HTTPServer

Posted on 2016-11-27
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Last Modified: 2016-11-28
My program should simulate a simple httpServer replying to clients requests. It should answer both .html and .html.gz requests. My problem is when I receive a .gz request. Currently execute_script is handling that request and it unzips the file but I can't send it back to the client. What's the problem with my code?

    void execute_script(int socket)
    {
   
          FILE *gp;
          char temp[SIZE_BUF];
          
          // Searchs for page in directory htdocs
          sprintf(buf_tmp,"htdocs/%s",req_buf);
          sprintf(temp, "gunzip -k %s", buf_tmp);

          // Verifies if file exists
          if((gp=popen(temp,"r"))==NULL) {
                // Page not found, send error to client
                printf("send_page: page %s not found, alerting client\n",buf_tmp);
                not_found(socket);
          }
          else {
                // Page found, send to client
          
                // First send HTTP header back to client
                send_header(socket);
   
                printf("send_page: sending page %s to client\n",buf_tmp);
                while(fgets(buf_tmp,SIZE_BUF,gp)!=NULL)
                      send(socket,buf_tmp,strlen(buf_tmp),0);
                
                // Close file
                pclose(gp);
          }
   
   
          
          return;
    }
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Question by:José Santos
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6 Comments
 
LVL 31

Accepted Solution

by:
Zoppo earned 500 total points
ID: 41903696
Hi José Santos,

I think this only can work if the gunzip writes the output to stdout so you can retrieve the result via the pipe. To do so I think you need to add -c or --stdout as argument to the gunzip call.

Hope this helps,

ZOPPO
1
 

Author Closing Comment

by:José Santos
ID: 41903991
Thank you ZOPPO, your solution solved my problem and the server is now working!
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 41903996
You're welcome, I'm glad I could help.

Have a nice day,

best regards,

ZOPPO
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 

Author Comment

by:José Santos
ID: 41903997
Can you just tell me what's the difference between -c and --stdout?
0
 
LVL 31

Expert Comment

by:Zoppo
ID: 41904003
There's no difference, it is very common for Linux-tool to offer some or all options in two forms, a short-form with a single character prefixed by one - and a self-explanatory long-form prefixed by a double --.
1
 

Author Comment

by:José Santos
ID: 41904007
Thank you again, I had no idea it worked that way.

Have a nice day,

José Santos
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

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