#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
# ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
# endif
# include <sys/time.h>
#include "ntpd.h"
#include "ntp_io.h"
#include "ntp_if.h"
#include "ntp_stdlib.h"
#ifndef MAXMONMEM
#define MAXMONMEM 600
#endif
#ifndef MONMEMINC
#define MONMEMINC 40
#endif
#define MON_HASH_SIZE 128
#define MON_HASH_MASK (MON_HASH_SIZE-1)
#define MON_HASH(addr) ((int)(ntohl((addr)) & MON_HASH_MASK))
static struct mon_data *mon_hash[MON_HASH_SIZE];
struct mon_data mon_mru_list;
struct mon_data mon_fifo_list;
static struct mon_data *mon_free;
static int mon_total_mem;
static int mon_mem_increments;
int mon_enabled;
static int mon_have_memory;
static void mon_getmoremem P((void));
static void remove_from_hash P((struct mon_data *));
void
init_mon(void)
{
mon_enabled = MON_OFF;
mon_have_memory = 0;
mon_total_mem = 0;
mon_mem_increments = 0;
mon_free = NULL;
memset((char *)&mon_hash[0], 0, sizeof mon_hash);
memset((char *)&mon_mru_list, 0, sizeof mon_mru_list);
memset((char *)&mon_fifo_list, 0, sizeof mon_fifo_list);
}
void
mon_start(
int mode
)
{
if (mon_enabled != MON_OFF) {
mon_enabled |= mode;
return;
}
if (mode == MON_OFF)
return;
if (!mon_have_memory) {
mon_total_mem = 0;
mon_mem_increments = 0;
mon_free = NULL;
mon_getmoremem();
mon_have_memory = 1;
}
mon_mru_list.mru_next = &mon_mru_list;
mon_mru_list.mru_prev = &mon_mru_list;
mon_fifo_list.fifo_next = &mon_fifo_list;
mon_fifo_list.fifo_prev = &mon_fifo_list;
mon_enabled = mode;
}
void
mon_stop(
int mode
)
{
register struct mon_data *md, *md_next;
register int i;
if (mon_enabled == MON_OFF)
return;
if ((mon_enabled & mode) == 0 || mode == MON_OFF)
return;
mon_enabled &= ~mode;
if (mon_enabled != MON_OFF)
return;
for (i = 0; i < MON_HASH_SIZE; i++) {
md = mon_hash[i];
mon_hash[i] = NULL;
while (md != NULL) {
md_next = md->hash_next;
md->hash_next = mon_free;
mon_free = md;
md = md_next;
}
}
mon_mru_list.mru_next = &mon_mru_list;
mon_mru_list.mru_prev = &mon_mru_list;
mon_fifo_list.fifo_next = &mon_fifo_list;
mon_fifo_list.fifo_prev = &mon_fifo_list;
}
void
ntp_monitor(
struct recvbuf *rbufp
)
{
register struct pkt *pkt;
register struct mon_data *md;
register u_long netnum;
register int hash;
register int mode;
if (mon_enabled == MON_OFF)
return;
pkt = &rbufp->recv_pkt;
netnum = NSRCADR(&rbufp->recv_srcadr);
hash = MON_HASH(netnum);
mode = PKT_MODE(pkt->li_vn_mode);
md = mon_hash[hash];
while (md != NULL) {
if (md->rmtadr == netnum &&
md->mode == (u_char)mode) {
md->lasttime = current_time;
md->count++;
md->version = PKT_VERSION(pkt->li_vn_mode);
md->rmtport = NSRCPORT(&rbufp->recv_srcadr);
md->mru_next->mru_prev = md->mru_prev;
md->mru_prev->mru_next = md->mru_next;
md->mru_next = mon_mru_list.mru_next;
md->mru_prev = &mon_mru_list;
mon_mru_list.mru_next->mru_prev = md;
mon_mru_list.mru_next = md;
return;
}
md = md->hash_next;
}
if (mon_free == NULL && mon_total_mem >= MAXMONMEM) {
md = mon_mru_list.mru_prev;
md->mru_prev->mru_next = &mon_mru_list;
mon_mru_list.mru_prev = md->mru_prev;
remove_from_hash(md);
md->fifo_prev->fifo_next = md->fifo_next;
md->fifo_next->fifo_prev = md->fifo_prev;
} else {
if (mon_free == NULL)
mon_getmoremem();
md = mon_free;
mon_free = md->hash_next;
}
md->lasttime = md->firsttime = current_time;
md->lastdrop = 0;
md->count = 1;
md->rmtadr = netnum;
md->rmtport = NSRCPORT(&rbufp->recv_srcadr);
md->mode = (u_char) mode;
md->version = PKT_VERSION(pkt->li_vn_mode);
md->interface = rbufp->dstadr;
md->cast_flags = ((rbufp->dstadr->flags & INT_MULTICAST) &&
rbufp->fd == md->interface->fd) ? MDF_MCAST: rbufp->fd ==
md->interface->bfd ? MDF_BCAST : MDF_UCAST;
md->hash_next = mon_hash[hash];
mon_hash[hash] = md;
md->mru_next = mon_mru_list.mru_next;
md->mru_prev = &mon_mru_list;
mon_mru_list.mru_next->mru_prev = md;
mon_mru_list.mru_next = md;
md->fifo_prev = mon_fifo_list.fifo_prev;
md->fifo_next = &mon_fifo_list;
mon_fifo_list.fifo_prev->fifo_next = md;
mon_fifo_list.fifo_prev = md;
}
static void
mon_getmoremem(void)
{
register struct mon_data *md;
register int i;
struct mon_data *freedata;
md = (struct mon_data *)emalloc(MONMEMINC * sizeof(struct mon_data));
freedata = mon_free;
mon_free = md;
for (i = 0; i < (MONMEMINC-1); i++) {
md->hash_next = (md + 1);
md++;
}
md->hash_next = freedata;
mon_total_mem += MONMEMINC;
mon_mem_increments++;
}
static void
remove_from_hash(
struct mon_data *md
)
{
register int hash;
register struct mon_data *md_prev;
hash = MON_HASH(md->rmtadr);
if (mon_hash[hash] == md) {
mon_hash[hash] = md->hash_next;
} else {
md_prev = mon_hash[hash];
while (md_prev->hash_next != md) {
md_prev = md_prev->hash_next;
if (md_prev == NULL) {
return;
}
}
md_prev->hash_next = md->hash_next;
}
}