Re: [Discussion] Retrieving a CID

[Martin Röhricht <ml@xxxxxxxxxxx>]

Am Montag, 24. Oktober 2005 19:36 schrieb John Heffner:
> > Unfortunately I never get to the point "connection not found" -- it looks
> > like I'm stuck in an infinite loop ...
>
> That's what I get for just typing in code and not trying it out. :)
>
> The while loop needs a conn = web100_connectoin_next(conn); at the end.

Great, that thing was missing. And I found another crucial error in my code. I 
shouldn't manipulate the host byte order of the addresses, so when I set the 
spec values, I should write:
        inet_aton(LocalAddress, &src_t);
        spec->src_addr = src_t.s_addr;
        inet_aton(RemoteAddress, &dst_t);
        spec->dst_addr = dst_t.s_addr;
        spec->src_port = LocalPort;
        spec->dst_port = RemotePort;
instead of using the ntohl() function ...

So finally I get the CID *yippiieee* :-)

Here is the code snippet for the archive:
-------------------------8<--------------------------
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <pthread.h>
#include "web100.h"
#include "web100-int.h"


const unsigned int  LocalPort = 0;
const char LocalAddress[13] = "141.3.17.217";
const unsigned int  RemotePort = 1980;
const char RemoteAddress[15] = "84.163.232.249";

int main(int argc, char *argv[]) {
        web100_agent            *agent;
        web100_connection       *conn;
        struct web100_connection_spec   *spec, *spec2;
        int     cid = -1;
        struct  in_addr src_t, dst_t;

        spec = (struct web100_connection_spec*) malloc(sizeof(struct 
web100_connection_spec));
        spec2 = (struct web100_connection_spec*) malloc(sizeof(struct 
web100_connection_spec));

        if((agent = web100_attach(WEB100_AGENT_TYPE_LOCAL, NULL)) == NULL) {
                web100_perror("web100_attach");
                exit(EXIT_FAILURE);
        }

        inet_aton(LocalAddress, &src_t);
        spec->src_addr = src_t.s_addr;
        inet_aton(RemoteAddress, &dst_t);
        spec->dst_addr = dst_t.s_addr;
        spec->src_port = LocalPort;
        spec->dst_port = RemotePort;

        conn = web100_connection_head(agent);

        while(conn) {
                web100_get_connection_spec(conn, spec2);
                if (spec->src_addr == spec2->src_addr &&
                    spec->dst_addr == spec2->dst_addr &&
                    spec->dst_port == spec2->dst_port)
                        break;
                conn = web100_connection_next(conn);
        }
        if(conn == NULL) {
                printf("connection not found\n");
                return 1;
        }

        cid = web100_get_connection_cid(conn);
        printf("Connection ID: %i\n", cid);
        /*
         * Instead of using a local int cid, one could use
         * conn->cid directly.
         */

        return 0;
}
-------------------------8<--------------------------

Further steps include to read the parameters for addresses and ports from a 
file and write a separate function to retrieve the CID.

Now I can go on to get the real work done and read the wanted variables 
periodically into a log file. :-)

Thank you very much, John.

Martin

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