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POC Socket Programming: HTTP request not working continously
 

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  1. POC Socket Programming: HTTP request not working continously
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    <p>I am a newbie to c socket programming and c itself. I have written a small piece of code that reads raw input from another internet socket and post the data to a webserver. the received data is always numeric. however the problem seems that the http post request happens only once instead of running in a loop and the program terminates.</p> <p>following is the code example</p> <pre><code>#include &lt;sys/types.h&gt; #include &lt;sys/socket.h&gt; #include &lt;netinet/in.h&gt; #include &lt;arpa/inet.h&gt; #include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;unistd.h&gt; #include &lt;errno.h&gt; #include &lt;string.h&gt; #include &lt;netdb.h&gt; //define server parameters #define WEBIP "172.16.100.2" int main() { //declare variables struct sockaddr_in my_addr,client_addr,server_addr; struct hostent *server_host; int true=1; int client_socket_id,server_socket_id; int client_id;int sin_size; int client_bytes_received; char send_data [1024],recv_data[1024],post_data[1024]; server_host=gethostbyname(WEBIP2); //create a socket to listen to client if ((client_socket_id = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("Error Creating Socket"); exit(1); } if (setsockopt(client_socket_id,SOL_SOCKET,SO_REUSEADDR,&amp;true,sizeof(int)) == -1) { perror("Setsockopt"); exit(1); } //create socket to connect to webserver if ((server_socket_id = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("Error Creating Webserver Socket"); exit(1); } my_addr.sin_family = AF_INET; my_addr.sin_port = htons(7070); my_addr.sin_addr.s_addr = INADDR_ANY; //bzero(&amp;(my_addr.sin_zero),8); bzero(&amp;(server_addr.sin_zero),8); server_addr.sin_family = AF_INET; server_addr.sin_port = htons(WEBPORT); server_addr.sin_addr = *((struct in_addr *)server_host-&gt;h_addr); //bind to a socket if (bind(client_socket_id, (struct sockaddr *)&amp;my_addr, sizeof(struct sockaddr))== -1) { perror("Unable to bind"); exit(1); } //listen to socket if (listen(client_socket_id, 5) == -1) { perror("Error Listening to Socket"); exit(1); } printf("\n\r Waiting for client on port 7070"); fflush(stdout); while(1) { sin_size = sizeof(struct sockaddr_in); client_id = accept(client_socket_id, (struct sockaddr *)&amp;client_addr,&amp;sin_size); printf("\n I got a connection from (%s , %d)", inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port)); //connect to remote server if (connect(server_socket_id, (struct sockaddr *)&amp;server_addr,sizeof(struct sockaddr)) == -1) { perror("Error Connecting to Web Server"); exit(1); } while(1){ //send some data to client send(client_id,"Hello, World!",13, 0); //receive some data from client client_bytes_received=recv(client_id,recv_data,1024,0); recv_data[client_bytes_received] = '\0'; //print received_data int c_length=strlen(recv_data)+11; printf("\n\rRecieved data (%d bytes %d words)= %s " , client_bytes_received,c_length,recv_data); //post dta to webserver fflush(stdout); bzero(&amp;post_data,1024); sprintf(post_data,"POST /environment.php HTTP/1.1\r\n" "Host: 172.16.100.2\r\n" "User-Agent: C Example Client\r\n" "Content-Type: application/x-www-form-urlencoded\r\n" "Content-Length: %d\r\n\r\n" "track_data=%s",c_length,recv_data); write(server_socket_id,post_data,strlen(post_data)+1); bzero(&amp;recv_data,1024); while((client_bytes_received=read(server_socket_id,recv_data,1024))&gt;0){ recv_data[client_bytes_received] = '\0'; if (fputs(recv_data,stdout)==EOF) perror("web server read_error"); } //print received_data printf("\n\rRecieved data from webserver (%d)= %s " , client_bytes_received,recv_data); // bzero(&amp;recv_data,1024); fflush(stdout); } } close(client_id); close(client_socket_id); return 0; } </code></pre>
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    1. USIshan Karve
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      1. VTUpMod
    1. CODiagnostic details, please. You have a lot of nice `perror()`'s in the code; surely you won't mind sharing with us the reason the program gave for stopping, would you?
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      1. POC Socket Programming: HTTP request not working continously
      1. USatzz
 

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