void termination_handler(int sig) {
PRINT_DEBUG("**********Terminating *******");
//shutdown all module threads in backwards order of startup
//rtm_shutdown();
udp_shutdown();
tcp_shutdown();
icmp_shutdown();
ipv4_shutdown();
arp_shutdown();
interface_shutdown(); //TODO finish
daemon_shutdown(); //TODO finish
switch_shutdown(); //TODO finish
//have each module free data & que/sem //TODO finish each of these
//rtm_release();
udp_release();
tcp_release();
icmp_release();
ipv4_release();
arp_release();
interface_release();
daemon_release();
switch_release();
PRINT_DEBUG("FIN");
exit(-1);
}
/*------------------------------------------------------------------------
* xsh_ping - shell command to ping a remote host
*------------------------------------------------------------------------
*/
shellcmd xsh_ping(int nargs, char *args[])
{
uint32 ipaddr; /* IP address in binary */
int32 retval; /* return value */
int32 icmpid; /* ICMP ID to use */
static int32 seq = 0; /* sequence number */
char buf[56]; /* buffer of chars */
int32 i; /* index into buffer */
int32 nextval; /* next value to use */
/* For argument '--help', emit help about the 'ping' command */
if (nargs == 2 && strncmp(args[1], "--help", 7) == 0) {
printf("Use: %s address\n\n", args[0]);
printf("Description:\n");
printf("\tUse ICMP Echo to ping a remote host\n");
printf("Options:\n");
printf("\t--help\t display this help and exit\n");
printf("\taddress\t an IP address in dotted decimal\n");
return 0;
}
/* Check for valid number of arguments */
if (nargs != 2) {
fprintf(stderr, "%s: invalid arguments\n", args[0]);
fprintf(stderr, "Try '%s --help' for more information\n",
args[0]);
return 1;
}
/* convert argument to binary */
retval = dot2ip(args[1], &ipaddr);
if ((int32)retval == SYSERR) {
fprintf(stderr, "%s: invalid IP address\n", args[0]);
return 1;
}
/* Register to receive an ICMP Echo Reply */
icmpid = icmp_register(ipaddr);
if (icmpid == SYSERR) {
fprintf(stderr, "%s: ICMP registration fails\n", args[0]);
return 1;
}
/* Fill the buffer with values - start with low-order byte of */
/* the sequence number and increment */
nextval = seq;
for (i = 0; i<sizeof(buf); i++) {
buf[i] = 0xff & nextval++;
}
/* Send an ICMP Echo Request */
retval = icmp_send(ipaddr, ICMP_ECHOREQST, icmpid, seq++, buf,
sizeof(buf));
if (retval == SYSERR) {
fprintf(stderr, "%s: cannot send a ping\n", args[0]);
icmp_release(icmpid);
return 1;
}
/* Read a reply */
retval = icmp_recv(icmpid, buf, sizeof(buf), 3000);
icmp_release(icmpid);
if (retval == TIMEOUT) {
fprintf(stderr, "%s: no response from %s\n\n", args[0],
args[1]);
return 1;
}
fprintf(stderr, "host %s is alive\n", args[1]);
return 0;
}
