xsh_udpdump.c

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/* xsh_udpdump.c - xsh_udpdump */

#include <xinu.h>
#include <stdio.h>
#include <string.h>

/*------------------------------------------------------------------------
 * xsh_udpdump - shell command to dump the UDP registered ports
 *------------------------------------------------------------------------
 */
shellcmd xsh_udpdump(int nargs, char *args[])
{
    int32   i;          /* index into udptab        */
    char    *udpstate[] = {     /* names for entry states   */
        "free ", "used ", "recv "};
    struct  udpentry *uptr;     /* ptr to entry in udptab   */
    uint32  remip;          /* variables to hold the info   */
    int32   r1,r2,r3,r4;        /* from an entry for printing   */
    int32   remprt, locprt;
    int32   state;
    pid32   pid;


    /* For argument '--help', emit help about the 'udpdump' command */

    if (nargs == 2 && strncmp(args[1], "--help", 7) == 0) {
        printf("Use: %s\n\n", args[0]);
        printf("Description:\n");
        printf("\tDisplays registerd UDP ports\n");
        printf("Options:\n");
        printf("\t--help\t display this help and exit\n");
        return 0;
    }

    /* Check for valid number of arguments */

    if (nargs > 1) {
        fprintf(stderr, "%s: no argumentd expected\n", args[0]);
        fprintf(stderr, "Try '%s --help' for more information\n",
                args[0]);
        return 1;
    }

    /* Print header for items from UDP table */

    printf("%5s %5s %5s    %9s    %8s %8s %3s %4s\n",
        "Entry", "Iface", "State", "Remote IP", "Rem Port",
        "Loc Port", "Pid", "Pkts");
    printf("%5s %5s %5s %15s %8s %8s %3s %4s\n",
        "-----", "-----", "-----", "---------------", "--------",
        "--------", "---", "----");

    /* Output information for each valid entry in udptab */
    for (i = 0; i < UDP_SLOTS; i++) {
        uptr = &udptab[i];
        if (uptr->udstate == UDP_FREE) {  /* skip unused slots  */
        printf("%3d   ---- slot is free ---\n", i);
        continue;
        }
        remip = uptr->udremip;
        r1 = (remip >> 24) & 0xff;
        r2 = (remip >> 16) & 0xff;
        r3 = (remip >>  8) & 0xff;
        r4 = (remip      ) & 0xff;
        remprt = uptr->udremport;
        locprt = uptr->udlocport;
        pid = uptr->udpid;
        state = uptr->udstate;
        printf("  %4s %3d.%3d.%3d.%3d %5d    %6d%5d%6d\n",
          udpstate[state], r1, r2, r3, r4, remprt, locprt, pid,
                            uptr->udcount);
    }
    return 0;
}