44 lines
865 B
C
44 lines
865 B
C
#include <isinetaddr.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
|
|
static int in_range(char buf[4], int min, int max);
|
|
|
|
int
|
|
iscidraddr(const char *str)
|
|
{
|
|
size_t offset = 0;
|
|
size_t len = (str == NULL ? 0 : strnlen(str, 16));
|
|
|
|
for(size_t i = 0; i < len; i++) {
|
|
if(str[i] == '/') {
|
|
offset = i;
|
|
break;
|
|
}
|
|
}
|
|
if (offset == 0) {
|
|
return isinetaddr(str);
|
|
} else {
|
|
char addr[offset], cidr[3];
|
|
char *c = (char*)&str[offset + 1];
|
|
memcpy(addr, str, offset);
|
|
memcpy(cidr, c, 2);
|
|
addr[offset] = '\0';
|
|
return isinetaddr(addr) && in_range(cidr, 0, 32);
|
|
}
|
|
}
|
|
|
|
static int
|
|
in_range(char buf[4], int min, int max)
|
|
{
|
|
char *err;
|
|
long r;
|
|
errno = 0;
|
|
if (strnlen(buf, 1) == 0) {
|
|
return 0;
|
|
} else {
|
|
r = strtol(buf, &err, 10);
|
|
return *err == '\0' && errno == 0 && (r >= min && r <= max);
|
|
}
|
|
}
|