获取到达数据包的IP地址

Question

所以我正在创建一个输入套接字

CFSocketCreateWithSocketSignature (NULL, &signature, kCFSocketDataCallBack, receiveData, &socket_context);

在receiveData函数(正确调用)中,我试图使用该CFDataRef address参数找出这个"包"的发件人地址.

发送方PC的IP地址为192.168.1.2.

我正在使用

char buffer[INET_ADDRSTRLEN]; NSLog([NSString stringWithFormat:@"incoming connection from: %s", inet_ntop(AF_INET, address, buffer, INET_ADDRSTRLEN)]);

但是我总是从日志中得到192.6.105.48.是什么赋予了？我在Cocoa/C网络方面真的不大,所以非常感谢任何帮助/解释.

提前致谢!

Answer 1

这是我为我的一个项目实现的NSData的Category类.使用CFDataRef和NSData之间的免费网桥,您可以使用以下类.

@implementation NSData (Additions)

- (int)port
{
    int port;
    struct sockaddr *addr;

    addr = (struct sockaddr *)[self bytes];
    if(addr->sa_family == AF_INET)
        // IPv4 family
        port = ntohs(((struct sockaddr_in *)addr)->sin_port);
    else if(addr->sa_family == AF_INET6)
        // IPv6 family
        port = ntohs(((struct sockaddr_in6 *)addr)->sin6_port);
    else
        // The family is neither IPv4 nor IPv6. Can't handle.
        port = 0;

    return port;
}


- (NSString *)host
{
    struct sockaddr *addr = (struct sockaddr *)[self bytes];
    if(addr->sa_family == AF_INET) {
        char *address = 
          inet_ntoa(((struct sockaddr_in *)addr)->sin_addr);
        if (address)
            return [NSString stringWithCString: address];
    }
    else if(addr->sa_family == AF_INET6) {
        struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
        char straddr[INET6_ADDRSTRLEN];
        inet_ntop(AF_INET6, &(addr6->sin6_addr), straddr, 
            sizeof(straddr));
        return [NSString stringWithCString: straddr];
    }
    return nil;
}

@end