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  1. #include <sys/types.h>
  2. #include <sys/socket.h>
  3. #include <netdb.h>
  4. #include <unistd.h>
  5. #include <cstdio>
  6. #include <cerrno>
  7. #include <cstdlib>
  8.  
  9. int main (int ac, char **av) {
  10.  
  11.   if(ac != 3) {
  12.     fprintf(stderr, "Usage: %s hostname portnumber\n", *av);
  13.     return 1;
  14.   }
  15.  
  16.   struct addrinfo *res0;
  17.   struct addrinfo hints = { AI_CANONNAME, 0, SOCK_DGRAM };
  18.   int rc = getaddrinfo(av[1], av[2], &hints, &res0);
  19.   if(rc) {
  20.     fprintf(stderr, "%s/%s: %s\n", av[1], av[2], gai_strerror(rc));
  21.     return 1;
  22.   }
  23.  
  24.   char *name = res0->ai_canonname;
  25.   for(struct addrinfo *res = res0; res; res=res->ai_next) {
  26.     fprintf(stderr, "%s: %04X/%04X/%04X ", name, res->ai_family, res->ai_socktype, res->ai_protocol);
  27.     int fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
  28.     if(fd < 0) {
  29.       perror("socket");
  30.       continue;
  31.     }
  32.  
  33.     rc = connect(fd, res->ai_addr, res->ai_addrlen);
  34.     if(rc < 0) {
  35.       perror("connect");
  36.       continue;
  37.     }
  38.     fprintf(stderr, "Connected (%d)\n", fd);
  39.     *(unsigned short*)res->ai_addr = htons(*(unsigned short*)res->ai_addr);
  40.     rc = send(fd, res->ai_addr, res->ai_addrlen, 0);
  41.     *(unsigned short*)res->ai_addr = ntohs(*(unsigned short*)res->ai_addr);
  42.     if(rc < 0) {
  43.       perror("send");
  44.     }
  45.     close(fd);
  46.   }
  47.   freeaddrinfo(res0);
  48. }
  49.  
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https://ideone.com/n89mu
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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