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Question

我很难将主机名转换为ping版本的traceroute (traceroute -I)的IP地址。

我想我可能不正确地转换我的指针，我试图访问sin_port的sockaddr_in结构，和s_addr的in_addr结构。

struct addrinfo * addrptr

...call getaddrinfo an start scanning results

if(addrptr->ai_family == AF_INET
      && addrptr->(struct sockaddr_in *)ai_addr->sin_port == 0 
      && addrptr->(struct in_addr *)ai_addr->s_addr == INADDR_ANY){

错误发生在：

               & addrptr->(struct sockaddr_in *)ai_addr->sin_port == 0 
                          ^

Answer 1

((struct sockaddr_in *)(addrptr->ai_addr))->sin_port
((struct sockaddr_in *)(addrptr->ai_addr))->s_addr