/*
* Receive a packet.
*/
int artnet_net_recv(node n, artnet_packet p, int delay) {
ssize_t len;
struct sockaddr_in cliAddr;
socklen_t cliLen = sizeof(cliAddr);
fd_set rset;
struct timeval tv;
int maxfdp1 = n->sd + 1;
FD_ZERO(&rset);
FD_SET((unsigned int) n->sd, &rset);
tv.tv_usec = 0;
tv.tv_sec = delay;
p->length = 0;
switch (select(maxfdp1, &rset, NULL, NULL, &tv)) {
case 0:
// timeout
return RECV_NO_DATA;
break;
case -1:
if ( errno != EINTR) {
artnet_error("Select error %s", artnet_net_last_error());
return ARTNET_ENET;
}
return ARTNET_EOK;
break;
default:
break;
}
// need a check here for the amount of data read
// should prob allow an extra byte after data, and pass the size as sizeof(Data) +1
// then check the size read and if equal to size(data)+1 we have an error
len = recvfrom(n->sd,
(char*) &(p->data), // char* for win32
sizeof(p->data),
0,
(SA*) &cliAddr,
&cliLen);
if (len < 0) {
artnet_error("Recvfrom error %s", artnet_net_last_error());
return ARTNET_ENET;
}
if (cliAddr.sin_addr.s_addr == n->state.ip_addr.s_addr ||
ntohl(cliAddr.sin_addr.s_addr) == LOOPBACK_IP) {
p->length = 0;
return ARTNET_EOK;
}
p->length = len;
memcpy(&(p->from), &cliAddr.sin_addr, sizeof(struct in_addr));
// should set to in here if we need it
return ARTNET_EOK;
}
/*
* Convert a string to an in_addr
*/
int artnet_net_inet_aton(const char *ip_address, struct in_addr *address) {
#ifdef HAVE_INET_ATON
if (!inet_aton(ip_address, address)) {
#else
in_addr_t *addr = (in_addr_t*) address;
if ((*addr = inet_addr(ip_address)) == INADDR_NONE) {
#endif
artnet_error("IP conversion from %s failed", ip_address);
return ARTNET_EARG;
}
return ARTNET_EOK;
}
/*
*
*/
const char *artnet_net_last_error() {
#ifdef WIN32
static char error_str[10];
int error = WSAGetLastError();
snprintf(error_str, sizeof(error_str), "%d", error);
return error_str;
#else
return strerror(errno);
#endif
}
/*
* Set if_head to point to a list of iface_t structures which represent the
* interfaces on this machine
* @param ift_head the address of the pointer to the head of the list
*/
static int get_ifaces(iface_t **if_head) {
struct ifaddrs *ifa_list, *ifa_iter;
iface_t *if_tail, *if_iter;
// struct sockaddr_in *sin;
char *if_name, *cptr;
*if_head = if_tail = NULL;
// struct sockaddr_dl *dl;
if (getifaddrs(&ifa_list) != 0) {
artnet_error("Error getting interfaces: %s", strerror(errno));
return ARTNET_ENET;
}
// // for (ifa_iter = ifa_list; ifa_iter; ifa_iter = ifa_iter->ifa_next)
// iface = new_iface(if_head, &if_tail);
for (ifa_iter = ifa_list; ifa_iter; ifa_iter = ifa_iter->ifa_next)
add_iface_if_needed(if_head, &if_tail, ifa_iter);
// Match up the interfaces with the corrosponding AF_PACKET interface
// to fetch the hw addresses
//
// TODO: Will probably not work on OS X, it should
// return AF_LINK -type sockaddr
for (if_iter = *if_head; if_iter; if_iter = if_iter->next) {
if_name = strdup(if_iter->if_name);
// if this is an alias, get mac of real interface
if ((cptr = strchr(if_name, ':')))
*cptr = 0;
// Find corresponding iface_t structure
for (ifa_iter = ifa_list; ifa_iter; ifa_iter = ifa_iter->ifa_next) {
if ((!ifa_iter->ifa_addr) || ifa_iter->ifa_addr->sa_family != AF_INET)
continue;
// if (strncmp(if_name, ifa_iter->ifa_name, IFNAME_SIZE) == 0) {
// // Found matching hw-address
//// sll = (struct sockaddr_ll*) ifa_iter->ifa_addr;
//// memcpy(if_iter->hw_addr, sll->sll_addr, ARTNET_MAC_SIZE);
// break;
// }
}
// // Find corresponding iface_t structure
// for (ifa_iter = ifa_list; ifa_iter; ifa_iter = ifa_iter->ifa_next) {
// if ((!ifa_iter->ifa_addr) || ifa_iter->ifa_addr->sa_family != AF_INET)
// continue;
//
// // if (strncmp(if_name, ifa_iter->ifa_name, IFNAME_SIZE) == 0) {
// // Found matching hw-address
// dl = (struct sockaddr_dl*)ifa_iter->ifa_addr;
// sin = (struct sockaddr_in *) ifa_iter->ifa_addr;
// iface->ip_addr.sin_addr = sin->sin_addr;
// sin = (struct sockaddr_in *) ifa_iter->ifa_dstaddr;
// iface->bcast_addr.sin_addr = sin->sin_addr;
// }
free(if_name);
}
freeifaddrs(ifa_list);
return 0;
}
/*
* Set if_head to point to a list of iface_t structures which represent the
* interfaces on this machine
* @param ift_head the address of the pointer to the head of the list
*/
static int get_ifaces(iface_t **if_head) {
iface_t *if_tail, *iface;
PIP_ADAPTER_INFO pAdapter = NULL;
PIP_ADAPTER_INFO pAdapterInfo;
IP_ADDR_STRING *ipAddress;
DWORD status;
ULONG ulOutBufLen = sizeof(IP_ADAPTER_INFO);
unsigned long net, mask;
if_tail = NULL;
while (1) {
pAdapterInfo = (IP_ADAPTER_INFO*) malloc(ulOutBufLen);
if (!pAdapterInfo) {
artnet_error("Error allocating memory needed for GetAdaptersinfo");
return ARTNET_EMEM;
}
status= GetAdaptersInfo(pAdapterInfo, &ulOutBufLen);
if (status == NO_ERROR)
break;
free(pAdapterInfo);
if (status != ERROR_BUFFER_OVERFLOW) {
printf("GetAdaptersInfo failed with error: %d\n", (int) status);
return ARTNET_ENET;
}
}
for (pAdapter = pAdapterInfo;
pAdapter && pAdapter < pAdapterInfo + ulOutBufLen;
pAdapter = pAdapter->Next) {
if(pAdapter->Type != MIB_IF_TYPE_ETHERNET)
continue;
for (ipAddress = &pAdapter->IpAddressList; ipAddress;
ipAddress = ipAddress->Next) {
net = inet_addr(ipAddress->IpAddress.String);
if (net) {
// Windows doesn't seem to have the notion of an interface being 'up'
// so we check if this interface has an address assigned.
iface = new_iface(if_head, &if_tail);
if (!iface)
continue;
mask = inet_addr(ipAddress->IpMask.String);
strncpy(iface->if_name, pAdapter->AdapterName, IFNAME_SIZE);
memcpy(iface->hw_addr, pAdapter->Address, ARTNET_MAC_SIZE);
iface->ip_addr.sin_addr.s_addr = net;
iface->bcast_addr.sin_addr.s_addr = (
(net & mask) | (0xFFFFFFFF ^ mask));
}
}
}
free(pAdapterInfo);
return (ARTNET_EOK);
}
/*
* Send a packet.
*/
int artnet_net_send(node n, artnet_packet p) {
struct sockaddr_in addr;
int ret;
if (n->state.mode != ARTNET_ON)
return ARTNET_EACTION;
addr.sin_family = AF_INET;
addr.sin_port = htons(ARTNET_PORT);
addr.sin_addr = p->to;
p->from = n->state.ip_addr;
if (n->state.verbose) {
//printf("sending to %s\n" , inet_ntoa(addr.sin_addr));
}
ret = sendto(n->sd,
(char*) &p->data, // char* required for win32
p->length,
0,
(SA*) &addr,
sizeof(addr));
if (ret == -1) {
artnet_error("Sendto failed: %s", artnet_net_last_error());
n->state.report_code = ARTNET_RCUDPFAIL;
return ARTNET_ENET;
} else if (p->length != ret) {
artnet_error("failed to send full datagram");
n->state.report_code = ARTNET_RCSOCKETWR1;
return ARTNET_ENET;
}
if (n->callbacks.send.fh) {
get_type(p);
n->callbacks.send.fh(n, p, n->callbacks.send.data);
}
return ARTNET_EOK;
}
/*
* Close a socket
*/
int artnet_net_close(int sock) {
#ifdef WIN32
shutdown(sock, SD_BOTH);
closesocket(sock);
//WSACancelBlockingCall();
WSACleanup();
#else
if (close(sock)) {
artnet_error(artnet_net_last_error());
return ARTNET_ENET;
}
#endif
return ARTNET_EOK;
}
/*
* Add a new interface to an interface list
* @param head pointer to the head of the list
* @param tail pointer to the end of the list
* @return a new iface_t or void
*/
static iface_t *new_iface(iface_t **head, iface_t **tail) {
iface_t *iface = (iface_t*) calloc(1, sizeof(iface_t));
if (!iface) {
artnet_error("%s: calloc error %s" , __FUNCTION__, strerror(errno));
return NULL;
}
memset(iface, 0, sizeof(iface_t));
if (!*head) {
*head = *tail = iface;
} else {
(*tail)->next = iface;
*tail = iface;
}
return iface;
}
/*
* Start listening on the socket
*/
int artnet_net_start(node n) {
int sock;
struct sockaddr_in servAddr;
int true_flag = TRUE;
node tmp;
// only attempt to bind if we are the group master
if (n->peering.master == TRUE) {
#ifdef WIN32
// check winsock version
WSADATA wsaData;
u_long _true = 1;
WORD wVersionRequested = MAKEWORD(2, 2);
if (WSAStartup(wVersionRequested, &wsaData) != 0)
return (-1);
if (wsaData.wVersion != wVersionRequested)
return (-2);
#endif
// create socket
sock = socket(PF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
artnet_error("Could not create socket %s", artnet_net_last_error());
return ARTNET_ENET;
}
memset(&servAddr, 0x00, sizeof(servAddr));
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(ARTNET_PORT);
servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
if (n->state.verbose)
printf("Binding to %s \n", inet_ntoa(servAddr.sin_addr));
// bind sockets
if (bind(sock, (SA *) &servAddr, sizeof(servAddr)) == -1) {
artnet_error("Failed to bind to socket %s", artnet_net_last_error());
artnet_net_close(sock);
return ARTNET_ENET;
}
// allow bcasting
if (setsockopt(sock,
SOL_SOCKET,
SO_BROADCAST,
(char*) &true_flag, // char* for win32
sizeof(int)) == -1) {
artnet_error("Failed to bind to socket %s", artnet_net_last_error());
artnet_net_close(sock);
return ARTNET_ENET;
}
#ifdef WIN32
// ### LH - 22.08.2008
// make it possible to reuse port, if SO_REUSEADDR
// exists on operating system
// NEVER USE SO_EXCLUSIVEADDRUSE, as that freezes the application
// on WinXP, if port is in use !
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *) &true_flag,
sizeof(true_flag)) < 0) {
artnet_error("Set reuse failed", artnet_net_last_error());
artnet_net_close(sock);
return ARTNET_ENET;
}
if (SOCKET_ERROR == ioctlsocket(sock, FIONBIO, &_true)) {
artnet_error("ioctlsocket", artnet_net_last_error());
artnet_net_close(sock);
return ARTNET_ENET;
}
#endif
n->sd = sock;
// Propagate the socket to all our peers
for (tmp = n->peering.peer; tmp && tmp != n; tmp = tmp->peering.peer)
tmp->sd = sock;
}
return ARTNET_EOK;
}
/*
* Scan for interfaces, and work out which one the user wanted to use.
*/
int artnet_net_init(node n, const char *preferred_ip) {
iface_t *ift, *ift_head = NULL;
struct in_addr wanted_ip;
int found = FALSE;
int i;
int ret = ARTNET_EOK;
if ((ret = get_ifaces(&ift_head)))
goto e_return;
if (n->state.verbose) {
printf("#### INTERFACES FOUND ####\n");
for (ift = ift_head; ift != NULL; ift = ift->next) {
printf("IP: %s\n", inet_ntoa(ift->ip_addr.sin_addr));
printf(" bcast: %s\n" , inet_ntoa(ift->bcast_addr.sin_addr));
printf(" hwaddr: ");
for (i = 0; i < ARTNET_MAC_SIZE; i++) {
if (i)
printf(":");
printf("%02x", (uint8_t) ift->hw_addr[i]);
}
printf("\n");
}
printf("#########################\n");
}
if (preferred_ip) {
// search through list of interfaces for one with the correct address
ret = artnet_net_inet_aton(preferred_ip, &wanted_ip);
if (ret)
goto e_cleanup;
for (ift = ift_head; ift != NULL; ift = ift->next) {
if (ift->ip_addr.sin_addr.s_addr == wanted_ip.s_addr) {
found = TRUE;
n->state.ip_addr = ift->ip_addr.sin_addr;
n->state.bcast_addr = ift->bcast_addr.sin_addr;
memcpy(&n->state.hw_addr, &ift->hw_addr, ARTNET_MAC_SIZE);
break;
}
}
if (!found) {
artnet_error("Cannot find interface by ip %s", preferred_ip);
ret = ARTNET_ENET;
goto e_cleanup;
}
} else {
if (ift_head) {
// pick first address
// copy ip address, bcast address and hardware address
n->state.ip_addr = ift_head->ip_addr.sin_addr;
n->state.bcast_addr = ift_head->bcast_addr.sin_addr;
memcpy(&n->state.hw_addr, &ift_head->hw_addr, ARTNET_MAC_SIZE);
} else {
artnet_error("No interfaces found!");
ret = ARTNET_ENET;
}
}
e_cleanup:
free_ifaces(ift_head);
e_return :
return ret;
}
/*
* Set if_head to point to a list of iface_t structures which represent the
* interfaces on this machine
* @param ift_head the address of the pointer to the head of the list
*/
static int get_ifaces(iface_t **if_head) {
struct ifconf ifc;
struct ifreq *ifr, ifrcopy;
struct sockaddr_in *sin;
int len, lastlen, flags;
char *buf, *ptr;
iface_t *if_tail, *iface;
int ret = ARTNET_EOK;
int sd;
*if_head = if_tail = NULL;
// create socket to get iface config
sd = socket(PF_INET, SOCK_DGRAM, 0);
if (sd < 0) {
artnet_error("%s : Could not create socket %s", __FUNCTION__, strerror(errno));
ret = ARTNET_ENET;
goto e_return;
}
// first use ioctl to get a listing of interfaces
lastlen = 0;
len = INITIAL_IFACE_COUNT * sizeof(struct ifreq);
for (;;) {
buf = malloc(len);
if (buf == NULL) {
artnet_error_malloc();
ret = ARTNET_EMEM;
goto e_free;
}
ifc.ifc_len = len;
ifc.ifc_buf = buf;
if (ioctl(sd, SIOCGIFCONF, &ifc) < 0) {
if (errno != EINVAL || lastlen != 0) {
artnet_error("%s : ioctl error %s", __FUNCTION__, strerror(errno));
ret = ARTNET_ENET;
goto e_free;
}
} else {
if (ifc.ifc_len == lastlen)
break;
lastlen = ifc.ifc_len;
}
len += IFACE_COUNT_INC * sizeof(struct ifreq);
free(buf);
}
// loop through each iface
for (ptr = buf; ptr < buf + ifc.ifc_len;) {
ifr = (struct ifreq*) ptr;
// work out length here
#ifdef HAVE_SOCKADDR_SA_LEN
len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
#else
switch (ifr->ifr_addr.sa_family) {
#ifdef IPV6
case AF_INET6:
len = sizeof(struct sockaddr_in6);
break;
#endif
case AF_INET:
default:
len = sizeof(SA);
break;
}
#endif
ptr += sizeof(ifr->ifr_name) + len;
// look for AF_INET interfaces
if (ifr->ifr_addr.sa_family == AF_INET) {
ifrcopy = *ifr;
if (ioctl(sd, SIOCGIFFLAGS, &ifrcopy) < 0) {
artnet_error("%s : ioctl error %s" , __FUNCTION__, strerror(errno));
ret = ARTNET_ENET;
goto e_free_list;
}
flags = ifrcopy.ifr_flags;
if ((flags & IFF_UP) == 0)
continue; //skip down interfaces
if ((flags & IFF_LOOPBACK))
continue; //skip lookback
iface = new_iface(if_head, &if_tail);
if (!iface)
goto e_free_list;
sin = (struct sockaddr_in *) &ifr->ifr_addr;
iface->ip_addr.sin_addr = sin->sin_addr;
// fetch bcast address
#ifdef SIOCGIFBRDADDR
if (flags & IFF_BROADCAST) {
if (ioctl(sd, SIOCGIFBRDADDR, &ifrcopy) < 0) {
artnet_error("%s : ioctl error %s" , __FUNCTION__, strerror(errno));
ret = ARTNET_ENET;
goto e_free_list;
}
sin = (struct sockaddr_in *) &ifrcopy.ifr_broadaddr;
iface->bcast_addr.sin_addr = sin->sin_addr;
}
#endif
// fetch hardware address
#ifdef SIOCGIFHWADDR
if (flags & SIOCGIFHWADDR) {
if (ioctl(sd, SIOCGIFHWADDR, &ifrcopy) < 0) {
artnet_error("%s : ioctl error %s", __FUNCTION__, strerror(errno));
ret = ARTNET_ENET;
goto e_free_list;
}
memcpy(&iface->hw_addr, ifrcopy.ifr_hwaddr.sa_data, ARTNET_MAC_SIZE);
}
#endif
/* ok, if that all failed we should prob try and use sysctl to work out the bcast
* and hware addresses
* i'll leave that for another day
*/
}
}
free(buf);
return ARTNET_EOK;
e_free_list:
free_ifaces(*if_head);
e_free:
free(buf);
close(sd);
e_return:
return ret;
}