1   │ #include <sys/types.h>
   2   │ #include <sys/socket.h>
   3   │ #include <netdb.h>
   4   │ #include <stdio.h>
   5   │ #include <stdlib.h>
   6   │ #include <netinet/in.h>
   7   │ #include <arpa/inet.h>
   8   │
   9   │ enum { MAX_LEN = 1001 };
  10   │
  11   │ char host[MAX_LEN], service[MAX_LEN];
  12   │
  13   │ int main() {
  14   │     struct addrinfo hints = {
  15   │         .ai_family = AF_INET,
  16   │         .ai_socktype = SOCK_STREAM
  17   │     };
  18   │
  19   │     while (scanf("%s%s", host, service) != EOF) {
  20   │         // printf("%s %s\n", host, service);
  21   │         struct addrinfo* result = NULL;
  22   │         int err = getaddrinfo(host, service, &hints, &result);
  23   │         if (err) {
  24   │             printf("%s\n", gai_strerror(err));
  25   │         } else {
  26   │             struct addrinfo* tmp = result;
  27   │             struct sockaddr_in *ans = (struct sockaddr_in *) tmp->ai_addr;
  28   │             while (tmp->ai_next) {
  29   │                 tmp = tmp->ai_next;
  30   │                 struct sockaddr_in *ain = (struct sockaddr_in *) tmp->ai_addr;
  31   │                 // printf("test: %s:%d\n", inet_ntoa(ain->sin_addr), ntohs(ain->sin_port));
  32   │                 if (ntohl(ain->sin_addr.s_addr) < ntohl(ans->sin_addr.s_addr)) {
  33   │                     ans = ain;
  34   │                 }
  35   │             }
  36   │             printf("%s:%d\n", inet_ntoa(ans->sin_addr), ntohs(ans->sin_port));
  37   │         }
  38   │         freeaddrinfo(result);
  39   │     }
  40   │
  41   │ }