Exemplos de netlookup em C++ (Cpp)

Exemplo n.º 1

Arquivo: net.c Projeto: Whosemario/libtask-comment

// 链接server:port，链接成功返回fd
int
netdial(int istcp, char *server, int port)
{
	int proto, fd, n;
	uint32_t ip;
	struct sockaddr_in sa;
	socklen_t sn;
	
	if(netlookup(server, &ip) < 0)
		return -1;

	taskstate("netdial");
	proto = istcp ? SOCK_STREAM : SOCK_DGRAM;
	if((fd = socket(AF_INET, proto, 0)) < 0){
		taskstate("socket failed");
		return -1;
	}
	fdnoblock(fd);

	/* for udp */
	if(!istcp){
		n = 1;
		setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &n, sizeof n);
	}
	
	/* start connecting */
	memset(&sa, 0, sizeof sa);
	memmove(&sa.sin_addr, &ip, 4);
	sa.sin_family = AF_INET;
	sa.sin_port = htons(port);
	if(connect(fd, (struct sockaddr*)&sa, sizeof sa) < 0 && errno != EINPROGRESS){
		printf(">>>>>>> connect failed \n");
		taskstate("connect failed");
		close(fd);
		return -1;
	}

	/* wait for finish */	
	fdwait(fd, 'w');
	sn = sizeof sa;
	if(getpeername(fd, (struct sockaddr*)&sa, &sn) >= 0){
		taskstate("connect succeeded");
		return fd;
	}
	
	/* report error */
	sn = sizeof n;
	getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&n, &sn);
	if(n == 0)
		n = ECONNREFUSED;
	close(fd);
	taskstate("connect failed");
	errno = n;
	return -1;
}

Exemplo n.º 2

Arquivo: net.c Projeto: git-hulk/libtask-annotation

// 开启监听
int
netannounce(int istcp, char *server, int port)
{
	int fd, n, proto;
	struct sockaddr_in sa;
	socklen_t sn;
	uint32_t ip;

	taskstate("netannounce");
    // 协议是 tcp 还是 udp
	proto = istcp ? SOCK_STREAM : SOCK_DGRAM;
	memset(&sa, 0, sizeof sa);
	sa.sin_family = AF_INET;
	if(server != nil && strcmp(server, "*") != 0){
        // 根据 server 来获取 ip，server 可以是 ip 或者域名
		if(netlookup(server, &ip) < 0){
			taskstate("netlookup failed");
			return -1;
		}
		memmove(&sa.sin_addr, &ip, 4);
	}
    // 端口转为网络字节序, 忘了是大端还是小端，懒，不想查
	sa.sin_port = htons(port);
    // 设置协议
	if((fd = socket(AF_INET, proto, 0)) < 0){
		taskstate("socket failed");
		return -1;
	}
	
	/* set reuse flag for tcp */
    // 设置 resue 选项, 当 time_wait 过多的时候，可以重用端口
	if(istcp && getsockopt(fd, SOL_SOCKET, SO_TYPE, (void*)&n, &sn) >= 0){
		n = 1;
		setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&n, sizeof n);
	}

    // 绑定监听的地址和端口到 fd
	if(bind(fd, (struct sockaddr*)&sa, sizeof sa) < 0){
		taskstate("bind failed");
		close(fd);
		return -1;
	}

    // 如果是 tcp 就开启监听
	if(proto == SOCK_STREAM)
		listen(fd, 16);

    // 设置为非阻塞
	fdnoblock(fd);
	taskstate("netannounce succeeded");
	return fd;
}

Exemplo n.º 3

Arquivo: net.c Projeto: Whosemario/libtask-comment

// 建立一个socket，绑定本地某个端口，且监听
int
netannounce(int istcp, char *server, int port)
{
	int fd, n, proto;
	struct sockaddr_in sa;
	socklen_t sn;
	uint32_t ip;

	taskstate("netannounce");
	proto = istcp ? SOCK_STREAM : SOCK_DGRAM;
	memset(&sa, 0, sizeof sa);
	sa.sin_family = AF_INET;
	if(server != nil && strcmp(server, "*") != 0){
		if(netlookup(server, &ip) < 0){
			taskstate("netlookup failed");
			return -1;
		}
		memmove(&sa.sin_addr, &ip, 4);
	}
	sa.sin_port = htons(port);
	if((fd = socket(AF_INET, proto, 0)) < 0){
		taskstate("socket failed");
		return -1;
	}
	
	/* set reuse flag for tcp */
	if(istcp && getsockopt(fd, SOL_SOCKET, SO_TYPE, (void*)&n, &sn) >= 0){
		n = 1;
		setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char*)&n, sizeof n);
	}

	if(bind(fd, (struct sockaddr*)&sa, sizeof sa) < 0){
		taskstate("bind failed");
		close(fd);
		return -1;
	}

	if(proto == SOCK_STREAM)
		listen(fd, 16);

	fdnoblock(fd);
	taskstate("netannounce succeeded");
	return fd;
}