static int find_slot(sd_id128_t uuid, const char *path, uint16_t *id) {
_cleanup_free_ uint16_t *options = NULL;
int n, i;
n = efi_get_boot_options(&options);
if (n < 0)
return n;
/* find already existing systemd-boot entry */
for (i = 0; i < n; i++)
if (same_entry(options[i], uuid, path)) {
*id = options[i];
return 1;
}
/* find free slot in the sorted BootXXXX variable list */
for (i = 0; i < n; i++)
if (i != options[i]) {
*id = i;
return 1;
}
/* use the next one */
if (i == 0xffff)
return -ENOSPC;
*id = i;
return 0;
}
static int find_slot(sd_id128_t uuid, const char *path, uint16_t *id) {
uint16_t *options = NULL;
int n_options;
int i;
uint16_t new_id = 0;
bool existing = false;
n_options = efi_get_boot_options(&options);
if (n_options < 0)
return n_options;
/* find already existing systemd-boot entry */
for (i = 0; i < n_options; i++)
if (same_entry(options[i], uuid, path)) {
new_id = options[i];
existing = true;
goto finish;
}
/* find free slot in the sorted BootXXXX variable list */
for (i = 0; i < n_options; i++)
if (i != options[i]) {
new_id = i;
goto finish;
}
/* use the next one */
if (i == 0xffff)
return -ENOSPC;
new_id = i;
finish:
*id = new_id;
free(options);
return existing;
}
//RETURN 0 WHEN NO TRIGGER UPDATE IS NEEDED (equal entries)
//RETURN 1 WHEN TRIGGER UPDATE IS NEEDED (not equal entries)
// and replace when better cost
int compare_entries (rip_table_t * table,
rip_route_t * route_aux,
ipv4_addr_t src ) {
int index;
int i;
for (i=0; i<RIP_ROUTE_TABLE_SIZE; i++){
if (table->routes[i] != NULL){
//IS THERE AN EXISTENT ROUTE??
//WE COMPARE DESTINATION ADDRESS
if (same_entry (table->routes[i]->ipv4_addr, route_aux->ipv4_addr)){
//THERE IS AN EXISTENT ROUTE
//COMPARE METRICS
int cmp_metrics = compare_metrics (table->routes[i]->metric, route_aux->metric);
//WE CHECK IF THIS DATAGRAM IS FROM THE SAME ROUTER AS THE EXISTING ROUTE
if (same_entry (table->routes[i]->ipv4_next, src)){
//THIS DATAGRAM IS FROM THE SAME ROUTER AS THE EXISTING ROUTE
//WE REINITIALIZE TIMEOUT
//reset_entry_timer (table->routes[i]);
//WE CHECK IF METRICS ARE DIFFERENT
if (cmp_metrics != 0){
//METRICS ARE DIFFERENT
//CHECK IF METRIC IS 16
if (metric_is_inf (route_aux->metric)){
//METRIC IS 16
//SUBSTITUTE ROUTE AND SET DELETE FLAG
set_delete_flag (table->routes[i]);
index = rip_replace_entry (table, table->routes[i], route_aux, i);
memcpy (table->routes[index]->ipv4_next, src, IPv4_ADDR_SIZE);
return 1;
} else {
//METRIC IS LOWER THAN 16
//SUBSTITUTE ROUTE AND RESET TIMER
index = rip_replace_entry (table, table->routes[i], route_aux, i);
memcpy (table->routes[index]->ipv4_next, src, IPv4_ADDR_SIZE);
reset_entry_timer (table->routes[index]);
return 1;
}
}else{
//METRICS ARE THE SAME
if (!metric_is_inf (route_aux->metric)){
//METRIC IS NOT 16
//RESET TIMER
reset_entry_timer (table->routes[i]);
return 0;
}else{
//METRIC IS 16
set_delete_flag (table->routes[i]);
return 0;
}
}
}else{
//THIS DATAGRAM IS NOT FROM THE SAME ROUTER AS THE EXISTING ROUTE
//WE CHECK IF METRICS ARE DIFFERENT
if (cmp_metrics != 0){
//METRICS ARE DIFFERENT
//WE CHECK IF THE NEW METRIC IS LOWER THAN THE ACTUAL ONE
if (cmp_metrics < 0)
//THE ACTUAL METRIC IS A BETTER OPTION, DO NOTHING
return 0;
else{
//THE NEW METRIC IS A BETTER OPTION, WE ADOPT THE NEW ROUTE
index = rip_replace_entry (table, table->routes[i], route_aux, i);
memcpy (table->routes[index]->ipv4_next, src, IPv4_ADDR_SIZE);
reset_entry_timer (table->routes[index]);
return 1;
}
}else{
//METRICS ARE THE SAME
//WE CHECK IF THE TIMER FOR THE ACTUAL ENTRY IS HALFWAY OR LOWER
if (timer_halfway(table->routes[i])){
//TIMER HALFWAY OR LOWER, SUBSTITUTE ROUTE
index = rip_replace_entry (table, table->routes[i], route_aux, i);
memcpy (table->routes[index]->ipv4_next, src, IPv4_ADDR_SIZE);
reset_entry_timer (table->routes[index]);
return 0;
}else
//TIMER IS FINE, DO NOTHING
return 0;
}
}
}
}
}
//THERE IS NOT AN EXISTENT ROUTE
if (route_aux->metric < 16){
index = rip_route_table_add (table, route_aux);
memcpy (table->routes[index]->ipv4_next, src, IPv4_ADDR_SIZE);
reset_entry_timer (table->routes[index]);
return 1;
}
else
return 0;
}