2.4 KiB
2.4 KiB
About
isinetaddr is a clang library that provides a set of functions for IP address validation. The library is guided by testcases that help verify safety and correctness.
Examples
isinetaddr4
The isinetaddr4 function returns true when given a valid IPv4 address:
#include <isinetaddr.h>
#include <stdio.h>
#include <stdlib.h>
const char *ipv4[] = {
/* valid */
"127.0.0.1", "1.1.1.1", "0.0.0.0",
/* invalid */
"0.0.0.0.0", "foobar"
};
int
main(void)
{
for (int i = 0; i < 5; i++) {
if (isinetaddr4(ipv4[i])) {
printf("%s is a valid IPv4 address.\n", ipv4[i]);
} else {
printf("%s is an invalid IPv4 address.\n", ipv4[i]);
}
}
return (EXIT_SUCCESS);
}
iscidraddr4
The iscidraddr4 function supports the same features as isinetaddr4 plus
CIDR notation.
The following example builds on the previous example:
#include <isinetaddr.h>
#include <stdio.h>
#include <stdlib.h>
const char *ipv4[] = {
/* valid */
"127.0.0.1", "192.168.2.1/32", "192.168.2.1/0",
/* invalid */
"192.168.2.1/33", "foobar"
};
int
main(void)
{
for (int i = 0; i < 5; i++) {
if (iscidraddr4(ipv4[i])) {
printf("%s is a valid IPv4 address.\n", ipv4[i]);
} else {
printf("%s is an invalid IPv4 address.\n", ipv4[i]);
}
}
return (EXIT_SUCCESS);
}
isinetaddr6
The isinetaddr6 function returns true when given a valid IPv6 address:
#include <isinetaddr.h>
#include <stdio.h>
#include <stdlib.h>
const char *ipv6[] = {
/* valid */
"::", "::1", "0000:0000:0000:0000:0000:0000:0000:0000",
/* invalid */
"foobar", "00:::0"
};
int
main(void)
{
for (int i = 0; i < 5; i++) {
if (isinetaddr6(ipv6[i])) {
printf("%s is a valid IPv4 address.\n", ipv6[i]);
} else {
printf("%s is an invalid IPv4 address.\n", ipv6[i]);
}
}
return (EXIT_SUCCESS);
}