Created
March 23, 2018 15:07
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#include <arpa/inet.h> | |
#include <net/if.h> | |
#include <ifaddrs.h> | |
#include <netdb.h> | |
#include <stdio.h> | |
int main(int argc, char* argv[], char* envp[]) { | |
struct ifaddrs *ifa=NULL,*ifEntry=NULL; | |
void *addPtr = NULL; | |
int rc = 0; | |
int family, addrLen, ret; | |
char addressBuffer[INET6_ADDRSTRLEN]; | |
char hostnameBuffer[255]; | |
rc = getifaddrs(&ifa); | |
if (rc == 0) { | |
for (ifEntry=ifa; ifEntry!=NULL; ifEntry=ifEntry->ifa_next) { | |
if (ifEntry->ifa_addr == NULL) { | |
continue; | |
} | |
if (!(ifEntry->ifa_flags & IFF_UP)) { | |
continue; | |
} | |
if(ifEntry->ifa_addr->sa_data == NULL) { | |
continue; | |
} | |
family = ifEntry->ifa_addr->sa_family; | |
addrLen = (family == AF_INET) ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6); | |
if (family == AF_INET) { | |
addPtr = &((struct sockaddr_in *)ifEntry->ifa_addr)->sin_addr; | |
} else if(family == AF_INET6) { | |
addPtr = &((struct sockaddr_in6 *)ifEntry->ifa_addr)->sin6_addr; | |
} else { | |
continue; | |
} | |
const char *a = inet_ntop(family, addPtr, addressBuffer, sizeof(addressBuffer)); | |
ret = getnameinfo(ifEntry->ifa_addr, addrLen, hostnameBuffer, sizeof(hostnameBuffer), NULL, 0, NI_NAMEREQD); | |
if (ret != 0) { | |
errx(1, "%s", gai_strerror(ret)); | |
} else | |
printf("%s %s\n", addressBuffer, hostnameBuffer); | |
} | |
} | |
freeifaddrs(ifa); | |
return 0; | |
} |
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