unsigned long deviceIPAddress(const char *itfName, char *hw_address)
{
unsigned long theAddr = LOCALHOST;
InitAddresses();
GetIPAddresses();
GetHWAddresses();
int i = 0;
while(i++ < MAXADDRS)
{
if (ip_addrs[i] == 0)
break;
if (ip_addrs[i] == LOCALHOST)
continue;
if ((if_names[i] != NULL) && strcmp(if_names[i], itfName) == 0)
{
theAddr = ip_addrs[i];
if(hw_address != NULL)
strcpy(hw_address, hw_addrs[i]);
break;
}
}
FreeAddresses();
//this will get you the right IP from your device in format like 198.111.222.444. If you use the for loop above you will se that ip_names array will also contain localhost IP 127.0.0.1 that's why I don't use it. Eventualy this was code from mac that's why it uses arrays for ip_names as macs can have multiple IPs
return theAddr;
}
//-------------------------------------------------------------------------------------------------------
static SOCKET BindAddress( char const *ip, char const *port, int family = AF_UNSPEC, int type = SOCK_STREAM )
{
SOCKET host_sock = INVALID_SOCKET;
addrinfo *addr = AllocAddressesForHost( ip, port, family, type, true );
ForEachAddress( addr, TryToBind, &host_sock );
FreeAddresses(addr);
return host_sock;
}
//-------------------------------------------------------------------------------------------------------
static void NetworkClient( char const *target, char const *port, char const *msg )
{
char const *host_name = AllocLocalHostName();
SOCKET sock = BindAddress(host_name, gClientPort, AF_INET, SOCK_DGRAM);
FreeLocalHostName(host_name);
if (sock == INVALID_SOCKET) {
printf( "Could not bind adddress.\n" );
return;
}
SpamHelper helper;
helper.sock = sock;
helper.msg = msg;
addrinfo *spam = AllocAddressesForHost( target, port, AF_UNSPEC, SOCK_DGRAM, false );
ForEachAddress( spam, SpamMessage, &helper );
FreeAddresses( spam );
closesocket( sock );
}
int GetIPAddresses()
{
int nextAddr = 0;
int len = 0, flags = 0;
char buffer[BUFFERSIZE] = {'\0'}, *ptr = NULL, lastname[IFNAMSIZ] = {'\0'}, *cptr = NULL, temp[80] = {'\0'};
struct ifconf ifc;
struct ifreq *ifr, ifrcopy;
struct sockaddr_in *sin;
int sockfd;
FreeAddresses();
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0) {
return nextAddr;
}
ifc.ifc_len = BUFFERSIZE;
ifc.ifc_buf = buffer;
if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
{
return nextAddr;
}
lastname[0] = 0;
for (ptr = buffer; ptr < buffer + ifc.ifc_len; ) {
ifr = (struct ifreq *)ptr;
len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
ptr += sizeof(ifr->ifr_name) + len; // for next one in buffer
if (ifr->ifr_addr.sa_family != AF_INET) {
continue; // ignore if not desired address family
}
if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL) {
*cptr = 0; // replace colon will null
}
if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0) {
continue; /* already processed this interface */
}
memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
ifrcopy = *ifr;
ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
flags = ifrcopy.ifr_flags;
if ((flags & IFF_UP) == 0) {
continue; // ignore if interface not up
}
if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+1);
if (if_names[nextAddr] == NULL) {
return nextAddr;
}
strcpy(if_names[nextAddr], ifr->ifr_name);
sin = (struct sockaddr_in *)&ifr->ifr_addr;
strcpy(temp, inet_ntoa(sin->sin_addr));
ip_names[nextAddr] = (char *)malloc(strlen(temp)+1);
if (ip_names[nextAddr] == NULL) {
return nextAddr;
}
strcpy(ip_names[nextAddr], temp);
++nextAddr;
}
close(sockfd);
return nextAddr;
}
