int udp_server_bind(int port, int num, void (*callback)(char * ip, int port, int sock_id, int event, void * buf, int len, void * callbackdata),void *callbackdata)
{
struct server_arg * arg;
struct sockaddr_in local;
arg = (struct server_arg *)malloc(sizeof(struct server_arg));
udp_startup();
arg->cb.callback = callback;
arg->cb.callbackdata= callbackdata;
local.sin_family=AF_INET;
local.sin_port=htons(port); ///监听端口
local.sin_addr.s_addr=INADDR_ANY; ///本机
arg->socket=socket(AF_INET,SOCK_DGRAM,0);
bind(arg->socket, (struct sockaddr*)&local, sizeof(local));
if( create_thread(&arg->thread, server_th, arg) ) {
closesocket(arg->socket);
WSACleanup();
free(arg);
return -1;
printf("udp bind error\n");
}
return 0;
}
t_stat udp_create (DEVICE *dptr, char *premote, int32 *pln)
{
// Create a logical UDP link to the specified remote system. The "remote"
// string specifies both the remote host name or IP and a port number. The
// port number is both the port we send datagrams to, and also the port we
// listen on for incoming datagrams. UDP doesn't have any real concept of a
// "connection" of course, and this routine simply creates the necessary
// sockets in this host. We have no way of knowing whether the remote host is
// listening or even if it exists.
//
// We return SCPE_OK if we're successful and an error code if we aren't. If
// we are successful, then the ln parameter is assigned the link number,
// which is a handle used to identify this connection to all future udp_xyz()
// calls.
t_stat ret;
int32 link = udp_find_free_link();
if (link < 0) return SCPE_MEM;
// Make sure WINSOCK is initialized ...
if ((ret = udp_startup(dptr)) != SCPE_OK) return ret;
// Parse the remote name and set up the ipaddr and port ...
if ((ret = udp_parse_remote(link, premote)) != SCPE_OK) return ret;
// Create the sockets for the transmitter and receiver ...
if ((ret = udp_create_rx_socket(link)) != SCPE_OK) return ret;
if ((ret = udp_create_tx_socket(link)) != SCPE_OK) return ret;
// All done - mark the TCP_LINK data as "used" and return the index.
udp_links[link].used = TRUE; *pln = link;
sim_debug(IMP_DBG_UDP, dptr, "link %d - listening on port %d and sending to %s\n", link, udp_links[link].rxport, udp_format_remote(link));
return SCPE_OK;
}
int udp_send(char * ip, int port, void *buf ,int len) {
SOCKET SendingSocket;
SOCKADDR_IN ReceiverAddr;
udp_startup();
//创建一个新的套接字来接收数据报
if((SendingSocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)) == INVALID_SOCKET) {
printf("ERROR:SOCKET failed with %d/n",WSAGetLastError());
WSACleanup();
return 1;
}
//建立一个SOCKADDR_IN结构，来识别发送数据报的目的地
ReceiverAddr.sin_family = AF_INET;
ReceiverAddr.sin_port = htons(port);
ReceiverAddr.sin_addr.s_addr = inet_addr(ip);
//把一个数据报发送到接收者
return sendto(SendingSocket,(char *)buf,len,0,(SOCKADDR *)&ReceiverAddr,sizeof(ReceiverAddr)) ;
closesocket(SendingSocket);
}
