# Vortex wargame: Level 0

# cat v0.c
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>

int main(int argc,char *argv[]){
 int sfd,s;
 struct addrinfo server_hints;
 struct addrinfo *server_result;
 memset(&server_hints,0,sizeof(struct addrinfo));
 server_hints.ai_family=AF_UNSPEC;
 server_hints.ai_socktype=SOCK_STREAM;
 server_hints.ai_protocol=0;
 getaddrinfo(argv[1],argv[2],&server_hints,&server_result);
 sfd=socket(server_result->ai_family,server_result->ai_socktype,server_result->ai_protocol);
 if(connect(sfd,server_result->ai_addr,server_result->ai_addrlen)!=-1){
  freeaddrinfo(server_result);
  int i,result,uint[4];
  char credentials[64];
  bzero(credentials,sizeof(credentials));
  result=0;
  for(i=0;i<4;i++){
   recv(sfd,&uint[i],sizeof(int),0);
   printf("uint[%d] = %d\n",i,uint[i]);
   result+=uint[i];
  }
  send(sfd,&result,sizeof(int),0);
  recv(sfd,credentials,sizeof(credentials),0);
  printf("%s\n",credentials);
  close(sfd);
 }
 return 0;
}
# gcc -o v0 v0.c
# ./v0 vortex.labs.overthewire.org 5842
uint[0] = 1643010444
uint[1] = 1050412351
uint[2] = 559062867
uint[3] = 556524630
Username: vortex1 Password: 477123717533624633