/*
* Return the name of the network whose address is given.
* The address is assumed to be that of a net or subnet, not a host.
*/
char *
netname(uint32_t in, uint32_t mask)
{
char *cp = 0;
static char line[MAXHOSTNAMELEN];
uint32_t omask, dmask;
uint32_t i;
i = ntohl(in);
dmask = forgemask(i);
omask = mask;
if (cp)
strncpy(line, cp, sizeof(line) - 1);
else {
switch (dmask) {
case IN_CLASSA_NET:
if ((i & IN_CLASSA_HOST) == 0) {
sprintf(line, "%u", C(i >> 24));
break;
}
/* FALLTHROUGH */
case IN_CLASSB_NET:
if ((i & IN_CLASSB_HOST) == 0) {
sprintf(line, "%u.%u",
C(i >> 24), C(i >> 16));
break;
}
/* FALLTHROUGH */
case IN_CLASSC_NET:
if ((i & IN_CLASSC_HOST) == 0) {
sprintf(line, "%u.%u.%u",
C(i >> 24), C(i >> 16), C(i >> 8));
break;
}
/*
* Return the name of the network whose address is given.
* The address is assumed to be that of a net or subnet, not a host.
*/
char *
netname(u_long in, u_long mask)
{
char *cp = 0;
static char line[MAXHOSTNAMELEN];
struct netent *np = 0;
u_long dmask;
u_long i;
#define NSHIFT(m) ( \
(m) == IN_CLASSA_NET ? IN_CLASSA_NSHIFT : \
(m) == IN_CLASSB_NET ? IN_CLASSB_NSHIFT : \
(m) == IN_CLASSC_NET ? IN_CLASSC_NSHIFT : \
0)
i = ntohl(in);
dmask = forgemask(i);
if (!numeric_addr && i) {
np = getnetbyaddr(i >> NSHIFT(mask), AF_INET);
if (np == NULL && mask == 0)
np = getnetbyaddr(i >> NSHIFT(dmask), AF_INET);
if (np != NULL) {
cp = np->n_name;
trimdomain(cp, strlen(cp));
}
}
static void
domask(char *dst, uint32_t addr, uint32_t mask)
{
int b, i;
if (!mask || (forgemask(addr) == mask)) {
*dst = '\0';
return;
}
i = 0;
for (b = 0; b < 32; b++)
if (mask & (1 << b)) {
int bb;
i = b;
for (bb = b+1; bb < 32; bb++)
if (!(mask & (1 << bb))) {
i = -1; /* noncontig */
break;
}
break;
}
if (i == -1)
sprintf(dst, "&0x%x", mask);
else
sprintf(dst, "/%d", 32-i);
}
/*
* Return the name of the network whose address is given.
* The address is assumed to be that of a net or subnet, not a host.
*/
char *
netname(u_long in, u_long mask)
{
char *cp = 0;
static char line[MAXHOSTNAMELEN];
struct netent *np = 0;
u_long dmask;
u_long i;
#define NSHIFT(m) ( \
(m) == IN_CLASSA_NET ? IN_CLASSA_NSHIFT : \
(m) == IN_CLASSB_NET ? IN_CLASSB_NSHIFT : \
(m) == IN_CLASSC_NET ? IN_CLASSC_NSHIFT : \
0)
i = ntohl(in);
dmask = forgemask(i);
if (!numeric_addr && i)
{
//np = getnetbyaddr(i >> NSHIFT(mask), AF_INET);
//if (np == NULL && mask == 0)
// np = getnetbyaddr(i >> NSHIFT(dmask), AF_INET);
//if (np != NULL) {
// cp = np->n_name;
//trimdomain(cp, strlen(cp));
// printf("LUOYU cp is %s\n", cp);
//}
}
#undef NSHIFT
#define C(x) (unsigned)((x) & 0xff)
if (cp != NULL)
{
strncpy(line, cp, sizeof(line) - 1);
line[sizeof(line) - 1] = '\0';
}
else
{
switch (dmask)
{
case IN_CLASSA_NET:
if ((i & IN_CLASSA_HOST) == 0)
{
sprintf(line, "%lu", C(i >> 24));
break;
}
/* FALLTHROUGH */
case IN_CLASSB_NET:
if ((i & IN_CLASSB_HOST) == 0)
{
sprintf(line, "%lu.%lu",
C(i >> 24), C(i >> 16));
break;
}
/* FALLTHROUGH */
case IN_CLASSC_NET:
if ((i & IN_CLASSC_HOST) == 0)
{
sprintf(line, "%lu.%lu.%lu",
C(i >> 24), C(i >> 16), C(i >> 8));
break;
}