Objective c 获取连接到套接字的主机的主机名

我正在使用Apple的TCPServer类在侦听传入连接时打开一个套接字。以下是当有人连接到侦听套接字时调用的回调：

static void TCPServerAcceptCallBack(CFSocketRef socket, CFSocketCallBackType type, CFDataRef address, const void *data, void *info) {
TCPServer *server = (TCPServer *)info;
if (kCFSocketAcceptCallBack == type) { 
    // for an AcceptCallBack, the data parameter is a pointer to a CFSocketNativeHandle
    CFSocketNativeHandle nativeSocketHandle = *(CFSocketNativeHandle *)data;
    uint8_t name[SOCK_MAXADDRLEN];
    socklen_t namelen = sizeof(name);
    NSData *peer = nil;
    if (0 == getpeername(nativeSocketHandle, (struct sockaddr *)name, &namelen)) {
        peer = [NSData dataWithBytes:name length:namelen];
    }

    CFReadStreamRef readStream = NULL;
    CFWriteStreamRef writeStream = NULL;
    CFStreamCreatePairWithSocket(kCFAllocatorDefault, nativeSocketHandle, &readStream, &writeStream);
    if (readStream && writeStream) {
        CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
        CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
        [server handleNewConnectionFromAddress:peer inputStream:(NSInputStream *)readStream outputStream:(NSOutputStream *)writeStream];
    } else {
        // on any failure, need to destroy the CFSocketNativeHandle 
        // since we are not going to use it any more
        close(nativeSocketHandle);
    }
    if (readStream) CFRelease(readStream);
    if (writeStream) CFRelease(writeStream);
}
}

有没有办法获取正在连接的设备的主机名？ 当做 科萨

[编辑] 我尝试了类似这样的方法来提取ip：

struct sockaddr_in *s = (struct sockaddr_in*)name;
char *ipstr = malloc(INET_ADDRSTRLEN);         
ipstr = inet_ntoa(s->sin_addr);

NSLog(@"ip = %s", ipstr);

但它给了我0.0.0.0

[编辑] 仍在努力，但仍然没有成功。根据苹果的文档，地址参数为：

一种CFData对象，包含适合于s协议族的结构sockaddr的内容（例如，中的结构sockaddr_或中的结构sockaddr_），用于标识s连接到的远程地址。除kCFSocketAcceptCallBack和kCFSocketDataCallBack回调外，此值为NULL

---

然而，我无法提取除132.20.0.1之外的任何其他IP（这显然不是我期望的IP），我真的很困惑，如果有人能帮我解决这个问题，那就太好了

在尝试按照您的方式获取地址后，我想出了一个适用于我的代码的轻微变体。如果您正在处理IPv6地址，则此代码正常工作，但很容易更改为使用IPv4。无论如何，我必须更改代码才能同时使用这两种代码

- (void)getPublicClientAddress {
    // Get public IP from stream

    // Get hands on appropriate data structures via the socket number
    CFSocketNativeHandle nativeSocketHandle = _socketnumber;
    uint8_t name[SOCK_MAXADDRLEN];
    socklen_t namelen = sizeof(name);
    NSData *peer = nil;
    if (0 == getpeername(nativeSocketHandle, (struct sockaddr *)name, &namelen)) {
        peer = [NSData dataWithBytes:name length:namelen];
    }

    // TODO distiguish between ipv4 and ipv6
    struct sockaddr_in6 *s = (struct sockaddr_in6*)name;

    // convert ip to string
    char *ipstr = malloc(INET6_ADDRSTRLEN);
    struct in6_addr *ipv6addr = &s->sin6_addr;  // used pointer here, but that really should make no difference
    inet_ntop(AF_INET6, ipv6addr, ipstr, sizeof(ipstr)); // used a different function here

    // convert port to int
    int portnumber = s->sin6_port;

    // Save in properties
    _publicIP   = [NSString stringWithFormat:@"%s", ipstr];
    _publicPort = [NSString stringWithFormat:@"%d", portnumber];
}

---

因此，这段代码对我很有用，我希望它能帮助那些在搜索答案时偶然发现这篇文章的人。

TCPServer的定义是什么？TCPServer是持有这种静态方法的类。它可以在iOS开发中心的“witap”示例项目中找到。这个回调在哪里使用？我只能看到

TCPServerDelegate

的用法：“[server handleNewConnectionFromAddress:peer-inputStream:（NSInputStream*）readStream-outputStream:（NSOutputStream*）writeStream]；”调用委托方法。您知道是否有其他方法可以从这里获取传入连接的主机名吗？代码的其余部分不包含任何有用的东西。