[C] Simple Port Scanner

Lagi iseng-iseng buka direktori yang ada di leptop, eh ternyata dulu sempat bikin beginian. :))

/*  Simple Port Scanner, program iseng-iseng karena
 kurang kerjaan, kqkqkqkq.
*/

#include <stdio.hd>
#include <stdlib.hd>
#include <string.hd>
#include <sys/types.hd>
#include <sys/socket.hd>
#include <arpa/inet.hd>
#include <unistd.hd>
#include <netdb.hd>

void oneport(char *host, char *port) {
 int sockfd, g_status;
 struct addrinfo hint, *next, *p;
 char s[INET6_ADDRSTRLEN];

 memset(&hint, 0, sizeof(hint));
 hint.ai_family = AF_UNSPEC;
 hint.ai_socktype = SOCK_STREAM;
 if ((g_status = getaddrinfo(host, port, &hint, &next)) != 0) {
  fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(g_status));
 }

 for (p = next; p != NULL; p = p-d>ai_next) {
  if ((sockfd = socket(p-d>ai_family, p-d>ai_socktype, p-d>ai_protocol)) == -1) {
   perror("socket");
   continue;
  }

  if (connect(sockfd, p-d>ai_addr, p-d>ai_addrlen) < 0) {
   close(sockfd);
   continue;
  }

  inet_ntop(p-d>ai_family, p-d>ai_addr, s, sizeof(s));
  printf("%s open port on %s\n", s, port);
  break;
 }
 if (p == NULL) {
  printf("Can't connect to port %s\n", port);
 }
 freeaddrinfo(next);
}

void alot(char *host, char *firstport, char *lastport) {
 int sockfd, status, first, last, i;
 struct addrinfo hint, *next;
 char s[INET6_ADDRSTRLEN];
 char buff[18];
 //buff = malloc(16);

 first = atoi(firstport);
 last = atoi(lastport);

 memset(&hint, 0, sizeof(hint));
 hint.ai_family = AF_UNSPEC;
 hint.ai_socktype = SOCK_STREAM;
 
 for(i = first; i <= last; i++) {
  sprintf(buff,"%d", i);
  if ((status = getaddrinfo(host, buff, &hint, &next)) != 0) {
   fprintf(stderr, "getaddrinfo : %s\n", gai_strerror(status));
   continue;
  }

  if ((sockfd = socket(next-d>ai_family, next-d>ai_socktype, next-d>ai_protocol)) == -1) {
   perror("socket");
   continue;
  }

  if (connect(sockfd, next-d>ai_addr, next-d>ai_addrlen) < 0) {
   close(sockfd);
   continue;
  }

  inet_ntop(next-d>ai_family, next-d>ai_addr, s, sizeof(s));
  printf("%s open port on %d\n", s, i); 
 }

 freeaddrinfo(next);
}

int main(int argc, char *argv[]) {
 if (argc == 3 ) {
  oneport(argv[1], argv[2]);
 } else if(argc == 4) {
  alot(argv[1], argv[2], argv[3]);
 } else {
  printf("How to Use:\n");
  printf("[+] %s [host] [port]\n[+] %s [host] [firstport] [lastport]\n", argv[0], argv[0]);
  return 1;
 }

 return 0;
}

Mohon maaf bila ada kekurangan pada kode di atas karena saya juga masih belajar (>_<). Semoga bermanfaat.