36845477b
 김태훈
네트워크 인터페이스의 IP 주소...
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#include <netdb.h>
#include <string.h>
#include <ifaddrs.h>
#include "inet.h"
static struct sockaddr *find_address_of(char *name, struct ifaddrs *from)
{
struct ifaddrs *ifa;
int n;
for (ifa = from, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
if (strcmp(ifa->ifa_name, name)) {
continue;
}
if (ifa->ifa_addr == NULL) {
continue;
}
int family = ifa->ifa_addr->sa_family;
if (family == AF_INET || family == AF_INET6) {
return ifa->ifa_addr;
}
}
return NULL;
}
static struct sockaddr *find_netmask_of(char *name, struct ifaddrs *from)
{
struct ifaddrs *ifa;
int n;
for (ifa = from, n = 0; ifa != NULL; ifa = ifa->ifa_next, n++) {
if (strcmp(ifa->ifa_name, name)) {
continue;
}
if (ifa->ifa_netmask == NULL) {
continue;
}
int family = ifa->ifa_netmask->sa_family;
if (family == AF_INET || family == AF_INET6) {
return ifa->ifa_netmask;
}
}
return NULL;
}
static int address_to_string(struct sockaddr *addr, char *buffer, int size)
{
return getnameinfo(addr,
(addr->sa_family == AF_INET)
? sizeof(struct sockaddr_in)
: sizeof(struct sockaddr_in6),
buffer, size,
NULL, 0,
NI_NUMERICHOST);
}
int get_ip_addr(char *p_ip, int sz_ip)
{
struct ifaddrs *ifaddr;
if (getifaddrs(&ifaddr) == -1) {
return -1;
}
struct sockaddr *address = find_address_of(IFNAME, ifaddr);
if (address == NULL) {
goto ERROR;
}
int ret = address_to_string(address, p_ip, sz_ip);
if (ret != 0) {
goto ERROR;
}
freeifaddrs(ifaddr);
return 0;
ERROR:
freeifaddrs(ifaddr);
return -1;
}
int get_netmask(char *p_netmask, int sz_netmask)
{
struct ifaddrs *ifaddr;
if (getifaddrs(&ifaddr) == -1) {
return -1;
}
struct sockaddr *netmask = find_netmask_of(IFNAME, ifaddr);
if (netmask == NULL) {
goto ERROR;
}
int ret = address_to_string(netmask, p_netmask, sz_netmask);
if (ret != 0) {
goto ERROR;
}
freeifaddrs(ifaddr);
return 0;
ERROR:
freeifaddrs(ifaddr);
return -1;
}
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