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nbtscan.c

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <sys/time.h>
#include <string.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
#include "statusq.h"
#include "range.h"
#include "list.h"
#include "errors.h"
#include "time.h"

int quiet=0;

print_banner() {
  printf("\nNBTscan version 1.5.1. Copyright (C) 1999-2003 Alla Bezroutchko.\n");
  printf("This is a free software and it comes with absolutely no warranty.\n");
  printf("You can use, distribute and modify it under terms of GNU GPL.\n\n");
}

void usage(void) {
  printf("Usage:\nnbtscan [-v] [-d] [-e] [-l] [-t timeout] [-b bandwidth] [-r] [-q] [-s separator] [-m retransmits] (-f filename)|(<scan_range>) \n");
  printf("\t-v\t\tverbose output. Print all names received\n");
  printf("\t\t\tfrom each host\n");
  printf("\t-d\t\tdump packets. Print whole packet contents.\n");
  printf("\t-e\t\tFormat output in /etc/hosts format.\n");
  printf("\t-l\t\tFormat output in lmhosts format.\n");
  printf("\t\t\tCannot be used with -v, -s or -h options.\n");
  printf("\t-t timeout\twait timeout milliseconds for response.\n");
  printf("\t\t\tDefault 1000.\n");
  printf("\t-b bandwidth\tOutput throttling. Slow down output\n");
  printf("\t\t\tso that it uses no more that bandwidth bps.\n");
  printf("\t\t\tUseful on slow links, so that ougoing queries\n");
  printf("\t\t\tdon't get dropped.\n");
  printf("\t-r\t\tuse local port 137 for scans. Win95 boxes\n");
  printf("\t\t\trespond to this only.\n");
  printf("\t\t\tYou need to be root to use this option on Unix.\n");
  printf("\t-q\t\tSuppress banners and error messages,\n");
  printf("\t-s separator\tScript-friendly output. Don't print\n");
  printf("\t\t\tcolumn and record headers, separate fields with separator.\n");
  printf("\t-h\t\tPrint human-readable names for services.\n");
  printf("\t\t\tCan only be used with -v option.\n");
  printf("\t-m retransmits\tNumber of retransmits. Default 0.\n");
  printf("\t-f filename\tTake IP addresses to scan from file filename.\n");
  printf("\t\t\t-f - makes nbtscan take IP addresses from stdin.\n");
  printf("\t<scan_range>\twhat to scan. Can either be single IP\n");
  printf("\t\t\tlike 192.168.1.1 or\n");
  printf("\t\t\trange of addresses in one of two forms: \n");
  printf("\t\t\txxx.xxx.xxx.xxx/xx or xxx.xxx.xxx.xxx-xxx.\n");
  printf("Examples:\n");
  printf("\tnbtscan -r 192.168.1.0/24\n");
  printf("\t\tScans the whole C-class network.\n");
  printf("\tnbtscan 192.168.1.25-137\n");
  printf("\t\tScans a range from 192.168.1.25 to 192.168.1.137\n");
  printf("\tnbtscan -v -s : 192.168.1.0/24\n");
  printf("\t\tScans C-class network. Prints results in script-friendly\n");
  printf("\t\tformat using colon as field separator.\n"); 
  printf("\t\tProduces output like that:\n");
  printf("\t\t192.168.0.1:NT_SERVER:00U\n");
  printf("\t\t192.168.0.1:MY_DOMAIN:00G\n");
  printf("\t\t192.168.0.1:ADMINISTRATOR:03U\n");
  printf("\t\t192.168.0.2:OTHER_BOX:00U\n");
  printf("\t\t...\n");
  printf("\tnbtscan -f iplist\n");
  printf("\t\tScans IP addresses specified in file iplist.\n");
  exit(2);
};

int set_range(char* range_str, struct ip_range* range_struct) {
  if(is_ip(range_str, range_struct)) return 1;
  if(is_range1(range_str, range_struct)) return 1;
  if(is_range2(range_str, range_struct)) return 1;
  return 0;
};

int print_header() {
  printf("%-17s%-17s%-10s%-17s%-17s\n", "IP address", "NetBIOS Name", 
       "Server", "User", "MAC address");
  printf("------------------------------------------------------------------------------\n");
};

int d_print_hostinfo(struct in_addr addr, const struct nb_host_info* hostinfo) {
  int i;
  unsigned char service; /* 16th byte of NetBIOS name */
  char name[16];

  printf("\nPacket dump for Host %s:\n\n", inet_ntoa(addr));
  if(hostinfo->is_broken) printf("Incomplete packet, %d bytes long.\n", hostinfo->is_broken);
      
  if(hostinfo->header) {
    printf("Transaction ID: 0x%04x (%1$d)\n", hostinfo->header->transaction_id);
    printf("Flags: 0x%04x (%1$d)\n", hostinfo->header->flags);
    printf("Question count: 0x%04x (%1$d)\n", hostinfo->header->question_count);
    printf("Answer count: 0x%04x (%1$d)\n", hostinfo->header->answer_count);
    printf("Name service count: 0x%04x (%1$d)\n", hostinfo->header->name_service_count);
    printf("Additional record count: 0x%04x (%1$d)\n", hostinfo->header->additional_record_count);
    printf("Question name: %s\n", hostinfo->header->question_name);
    printf("Question type: 0x%04x (%1$d)\n", hostinfo->header->question_type);
    printf("Question class: 0x%04x (%1$d)\n", hostinfo->header->question_class);
    printf("Time to live: 0x%08x (%1$d)\n", hostinfo->header->ttl);
    printf("Rdata length: 0x%04x (%1$d)\n", hostinfo->header->rdata_length);
    printf("Number of names: 0x%02x (%1$d)\n", hostinfo->header->number_of_names);
  };
      
  if(hostinfo->names) {
    printf("Names received:\n");
    for(i=0; i< hostinfo->header->number_of_names; i++) {
      service = hostinfo->names[i].ascii_name[15];
      strncpy(name, hostinfo->names[i].ascii_name, 15);
      name[16]=0; 
      printf("%-17s Service: 0x%02x Flags: 0x%04x\n", name, service, hostinfo->names[i].rr_flags);
    }
  };
      
  if(hostinfo->footer) {
    printf("Adapter address: %02x-%02x-%02x-%02x-%02x-%02x\n", 
         hostinfo->footer->adapter_address[0], hostinfo->footer->adapter_address[1],
         hostinfo->footer->adapter_address[2], hostinfo->footer->adapter_address[3],
         hostinfo->footer->adapter_address[4], hostinfo->footer->adapter_address[5]); 
    printf("Version major: 0x%02x (%1$d)\n", hostinfo->footer->version_major);
    printf("Version minor: 0x%02x (%1$d)\n", hostinfo->footer->version_minor);
    printf("Duration: 0x%04x (%1$d)\n", hostinfo->footer->duration);
    printf("FRMRs Received: 0x%04 (%1$d)\n", hostinfo->footer->frmps_received);
    printf("FRMRs Transmitted: 0x%04 (%1$d)\n", hostinfo->footer->frmps_transmitted);
    printf("IFrame Receive errors: 0x%04 (%1$d)\n", hostinfo->footer->iframe_receive_errors);
    printf("Transmit aborts: 0x%04 (%1$d)\n", hostinfo->footer->transmit_aborts);
    printf("Transmitted: 0x%08 (%1$d)\n", hostinfo->footer->transmitted);
    printf("Received: 0x%08 (%1$d)\n", hostinfo->footer->received);
    printf("IFrame transmit errors: 0x%04 (%1$d)\n", hostinfo->footer->iframe_transmit_errors);
    printf("No receive buffers: 0x%04 (%1$d)\n", hostinfo->footer->no_receive_buffer);
    printf("tl timeouts: 0x%04 (%1$d)\n", hostinfo->footer->tl_timeouts);
    printf("ti timeouts: 0x%04 (%1$d)\n", hostinfo->footer->ti_timeouts);
    printf("Free NCBS: 0x%04 (%1$d)\n", hostinfo->footer->free_ncbs);        
    printf("NCBS: 0x%04 (%1$d)\n", hostinfo->footer->ncbs);
    printf("Max NCBS: 0x%04 (%1$d)\n", hostinfo->footer->max_ncbs);
    printf("No transmit buffers: 0x%04 (%1$d)\n", hostinfo->footer->no_transmit_buffers);
    printf("Max datagram: 0x%04 (%1$d)\n", hostinfo->footer->max_datagram);
    printf("Pending sessions: 0x%04 (%1$d)\n", hostinfo->footer->pending_sessions);
    printf("Max sessions: 0x%04 (%1$d)\n", hostinfo->footer->max_sessions);
    printf("Packet sessions: 0x%04 (%1$d)\n", hostinfo->footer->packet_sessions);
  };
};


int v_print_hostinfo(struct in_addr addr, const struct nb_host_info* hostinfo, char* sf, int hr) {
  int i, unique;
  my_uint8_t service; /* 16th byte of NetBIOS name */
  char name[16];
  char* sname;

  if(!sf) {
    printf("\nNetBIOS Name Table for Host %s:\n\n", inet_ntoa(addr));
    if(hostinfo->is_broken) 
      printf("Incomplete packet, %d bytes long.\n", hostinfo->is_broken);

    printf("%-17s%-17s%-17s\n", "Name", "Service", "Type");
    printf("----------------------------------------\n");
  };
  if(hostinfo->header && hostinfo->names) {
    for(i=0; i< hostinfo->header->number_of_names; i++) {
      service = hostinfo->names[i].ascii_name[15];
      strncpy(name, hostinfo->names[i].ascii_name, 15);
      name[16]=0;
      unique = !(hostinfo->names[i].rr_flags & 0x0080);
      if(sf) {
      printf("%s%s%s%s", inet_ntoa(addr), sf, name, sf);
      if(hr) printf("%s\n", (char*)getnbservicename(service, unique, name));
      else {
        printf("%02x", service);
        if(unique) printf("U\n");
        else printf("G\n");
      }
      } else {
      printf("%-17s",  name);
      if(hr) printf("%s\n", (char*)getnbservicename(service, unique, name));
      else {      
        printf("<%02x>", service);
        if(unique)  printf("             UNIQUE\n");
        else printf("              GROUP\n");
      };
      }
    };
  };
      
  if(hostinfo->footer) {
    if(sf) printf("%s%sMAC%s", inet_ntoa(addr), sf, sf); 
    else printf("\nAdapter address: ");
    printf("%02x-%02x-%02x-%02x-%02x-%02x\n",
         hostinfo->footer->adapter_address[0], hostinfo->footer->adapter_address[1],
         hostinfo->footer->adapter_address[2], hostinfo->footer->adapter_address[3],
         hostinfo->footer->adapter_address[4], hostinfo->footer->adapter_address[5]);     
  };
  if(!sf) printf("----------------------------------------\n");
  return 1;
};

int print_hostinfo(struct in_addr addr, struct nb_host_info* hostinfo, char* sf) {
  int i;
  unsigned char service; /* 16th byte of NetBIOS name */
  char comp_name[16], user_name[16];
  int is_server=0;
  int unique;
  int first_name=1;

  strncpy(comp_name,"<unknown>",15);
  strncpy(user_name,"<unknown>",15);
  if(hostinfo->header && hostinfo->names) {
    for(i=0; i< hostinfo->header->number_of_names; i++) {
      service = hostinfo->names[i].ascii_name[15];
      unique = ! (hostinfo->names[i].rr_flags & 0x0080);
      if(service == 0  && unique && first_name) {
                        /* Unique name, workstation service - this is computer name */ 
      strncpy(comp_name, hostinfo->names[i].ascii_name, 15);
      comp_name[15] = 0;
      first_name = 0;
      };
      if(service == 0x20 && unique) {
      is_server=1;
      }
      if(service == 0x03 && unique) {
      strncpy(user_name, hostinfo->names[i].ascii_name, 15);
      user_name[15]=0;
      };
    };
  };

  if(sf) {
    printf("%s%s%s%s", inet_ntoa(addr), sf, comp_name, sf);
    if(is_server) printf("<server>");
    printf("%s%s%s", sf, user_name, sf);
  } else {
    printf("%-17s%-17s",inet_ntoa(addr),comp_name);
    if(is_server) printf("%-10s", "<server>"); else printf("%-10s","");
    printf("%-17s", user_name);
  };
  if(hostinfo->footer) {
    printf("%02x-%02x-%02x-%02x-%02x-%02x\n",
         hostinfo->footer->adapter_address[0], hostinfo->footer->adapter_address[1],
         hostinfo->footer->adapter_address[2], hostinfo->footer->adapter_address[3],
         hostinfo->footer->adapter_address[4], hostinfo->footer->adapter_address[5]);
  } else {
    printf("\n");
  };
  return 1;
};

/* Print hostinfo in /etc/hosts or lmhosts format */
/* If l is true adds #PRE to each line of output (for lmhosts) */

int l_print_hostinfo(struct in_addr addr, struct nb_host_info* hostinfo, int l) {
  int i;
  unsigned char service; /* 16th byte of NetBIOS name */
  char comp_name[16];
  int is_server=0;
  int unique;
  int first_name=1;

  strncpy(comp_name,"<unknown>",15);

  if(hostinfo->header && hostinfo->names) {
    for(i=0; i< hostinfo->header->number_of_names; i++) {
      service = hostinfo->names[i].ascii_name[15];
      unique = ! (hostinfo->names[i].rr_flags & 0x0080);
      if(service == 0  && unique && first_name) {
                        /* Unique name, workstation service - this is computer name */ 
      strncpy(comp_name, hostinfo->names[i].ascii_name, 15);
      comp_name[15]=0;
      first_name = 0;
      };
    };
  };
  printf("%s\t%s", inet_ntoa(addr), comp_name);
  if(l) printf("\t#PRE");
  printf("\n");
}

      
#define BUFFSIZE 1024

int main(int argc, char *argv[]) {
  int timeout=1000, verbose=0, use137=0, ch, dump=0, bandwidth=0, send_ok=0, hr=0, etc_hosts=0, lmhosts=0;
  extern char *optarg;
  extern int optind;
  char* target_string;
  char* sf=NULL;
  char* filename =NULL;
  struct ip_range range;
  void *buff;
  int sock, addr_size;
  struct sockaddr_in src_sockaddr, dest_sockaddr;
  struct  in_addr *prev_in_addr=NULL;
  struct  in_addr *next_in_addr;
  struct timeval select_timeout, last_send_time, current_time, diff_time, send_interval;
  struct timeval transmit_started, now, recv_time;
  struct nb_host_info* hostinfo;
  fd_set* fdsr;
  fd_set* fdsw;
  int sel, size;
  struct list* scanned;
  my_uint32_t rtt_base; /* Base time (seconds) for round trip time calculations */
  float rtt; /* most recent measured RTT, seconds */
  float srtt=0; /* smoothed rtt estimator, seconds */
  float rttvar=0.75; /* smoothed mean deviation, seconds */ 
  double delta; /* used in retransmit timeout calculations */
  int rto, retransmits=0, more_to_send=1, i;
  char errmsg[80];
  char str[80];
  FILE* targetlist=NULL;

  /* Parse supplied options */
  /**************************/
  if(argc<2) { 
    print_banner(); 
    usage();
  };

  while ((ch = getopt(argc, argv, "vrdelqhm:s:t:b:f:")) != -1)
    switch (ch) {
    case 'v':
      verbose = 1;
      break;
    case 't':
      timeout=atoi(optarg);
      if(timeout==0) { 
      printf("Bad timeout value: %s\n", optarg);
      usage();
      };
      break;
    case 'r':
#if defined WINDOWS
      printf("Warning: -r option not supported under Windows. Running without it.\n\n");
#else
      use137=1;
#endif
      break;
    case 'd':
      dump=1;
      break;
    case 'e':
      etc_hosts=1;
      break;
    case 'l':
      lmhosts=1;
      break;
    case 'q':
      quiet=1; /* Global variable */
      break;
    case 'b':
      bandwidth=atoi(optarg);
      if(bandwidth==0) err_print("Bad bandwidth value, ignoring it", quiet);
      break;
    case 'h':
      hr=1; /* human readable service names instead of hex codes */
      break;
    case 's':
      sf=optarg; /* script-friendly output format */
      break;
    case 'm':
      retransmits=atoi(optarg);
      if(retransmits==0) { 
      printf("Bad number of retransmits: %s\n", optarg);
      usage();
      };
      break;
    case 'f':
      filename = optarg;
      break;
    default:
      print_banner();
      usage();
    };

  if(dump && verbose) {
    printf("Cannot be used with both dump (-d) and verbose (-v) options.\n");
    usage();
  };  

  if(dump && sf) {
    printf("Cannot be used with both dump (-d) and script-friendly (-s) options.\n");
    usage();
  };

  if(dump && lmhosts) {
    printf("Cannot be used with both dump (-d) and lmhosts (-l) options.\n");
    usage;
  };

  if(dump && etc_hosts) {
    printf("Cannot be used with both dump (-d) and /etc/hosts (-e) options.\n");
    usage;
  };

  if(verbose && lmhosts){
    printf("Cannot be used with both verbose (-v) and lmhosts (-l) options.\n");
    usage;
  };

  if(verbose && etc_hosts){
    printf("Cannot be used with both verbose (-v) and /etc/hosts (-e) options.\n");
    usage;
  };

  if(lmhosts && etc_hosts){
    printf("Cannot be used with both lmhosts (-l) and /etc/hosts (-e) options.\n");
    usage;
  };

      
  if(dump && hr) {
    printf("Cannot be used with both dump (-d) and \"human-readable service names\" (-h) options.\n");
    usage();
  };

  if(hr && !verbose) {
    printf("\"Human-readable service names\" (-h) option cannot be used without verbose (-v) option.\n");
    usage();
  };

  if(filename) {
    if(strcmp(filename, "-") == 0) { /* Get IP addresses from stdin */
      targetlist = stdin; 
      target_string = "STDIN";
    } else {
      targetlist=fopen(filename,"r");
      target_string = filename;
    };
    if(!targetlist) {
      snprintf(errmsg, 80, "Cannot open file %s", filename);
      err_die(errmsg, quiet);
    }  
  } else {  
    argc -= optind;
    argv += optind;
    if(argc!=1) usage();

    if((target_string=strdup(argv[0]))==NULL) 
      err_die("Malloc failed.\n", quiet);
    
    if(!set_range(target_string, &range)) {
      printf("Error: %s is not an IP address or address range.\n", target_string);
      free(target_string);
      usage();
    };
  }

      
  if(!(quiet || sf || lmhosts || etc_hosts)) printf("Doing NBT name scan for addresses from %s\n\n", target_string);

  /* Finished with options */
  /*************************/

  /* Prepare socket and address structures */
  /*****************************************/
  sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  if (sock < 0) 
    err_die("Failed to create socket", quiet);

  bzero((void*)&src_sockaddr, sizeof(src_sockaddr));
  src_sockaddr.sin_family = AF_INET;
  if(use137) src_sockaddr.sin_port = htons(NB_DGRAM);
  if (bind(sock, (struct sockaddr *)&src_sockaddr, sizeof(src_sockaddr)) == -1) 
    err_die("Failed to bind", quiet);
        
  fdsr=malloc(sizeof(fd_set));
  if(!fdsr)  err_die("Malloc failed", quiet);
  FD_ZERO(fdsr);
  FD_SET(sock, fdsr);
        
  fdsw=malloc(sizeof(fd_set));
  if(!fdsw) err_die("Malloc failed", quiet);
  FD_ZERO(fdsw);
  FD_SET(sock, fdsw);

  /* timeout is in milliseconds */
  select_timeout.tv_sec = timeout / 1000;
  select_timeout.tv_usec = (timeout % 1000) * 1000; /* Microseconds */

  addr_size = sizeof(struct sockaddr_in);

  next_in_addr = malloc(sizeof(struct  in_addr));
  if(!next_in_addr) err_die("Malloc failed", quiet);

  buff=malloc(BUFFSIZE);
  if(!buff) err_die("Malloc failed", quiet);
      
  /* Calculate interval between subsequent sends */

  timerclear(&send_interval);
  if(bandwidth) send_interval.tv_usec = 
              (NBNAME_REQUEST_SIZE + UDP_HEADER_SIZE + IP_HEADER_SIZE)*8*1000000 /
              bandwidth;  /* Send interval in microseconds */
  else /* Assuming 10baseT bandwidth */
    send_interval.tv_usec = 1; /* for 10baseT interval should be about 1 ms */
  if (send_interval.tv_usec >= 1000000) {
    send_interval.tv_sec = send_interval.tv_usec / 1000000;
    send_interval.tv_usec = send_interval.tv_usec % 1000000;
  }
      
  gettimeofday(&last_send_time, NULL); /* Get current time */

  rtt_base = last_send_time.tv_sec; 

  /* Send queries, receive answers and print results */
  /***************************************************/
      
  scanned = new_list();

  if(!(quiet || verbose || dump || sf || lmhosts || etc_hosts)) print_header();
      
  for(i=0; i <= retransmits; i++) {
    gettimeofday(&transmit_started, NULL);
    while ( (select(sock+1, fdsr, fdsw, NULL, &select_timeout)) > 0) {
      if(FD_ISSET(sock, fdsr)) {
      if ( (size = recvfrom(sock, buff, BUFFSIZE, 0,
                        (struct sockaddr*)&dest_sockaddr, &addr_size)) <= 0 ) {
        snprintf(errmsg, 80, "%s\tRecvfrom failed", inet_ntoa(dest_sockaddr.sin_addr));
        err_print(errmsg, quiet);
        continue;
      };
      gettimeofday(&recv_time, NULL);
      hostinfo = (struct nb_host_info*)parse_response(buff, size);
      if(!hostinfo) {
        err_print("parse_response returned NULL", quiet);
        continue;
      };
                        /* If this packet isn't a duplicate */
      if(insert(scanned, ntohl(dest_sockaddr.sin_addr.s_addr))) {
        rtt = recv_time.tv_sec + 
          recv_time.tv_usec/1000000 - rtt_base - 
          hostinfo->header->transaction_id/1000;
        /* Using algorithm described in Stevens' 
           Unix Network Programming */
        delta = rtt - srtt;
        srtt += delta / 8;
        if(delta < 0.0) delta = - delta;
        rttvar += (delta - rttvar) / 4 ;
                        
        if (verbose) 
          v_print_hostinfo(dest_sockaddr.sin_addr, hostinfo, sf, hr);
        else if (dump) 
          d_print_hostinfo(dest_sockaddr.sin_addr, hostinfo);
        else if (etc_hosts)
          l_print_hostinfo(dest_sockaddr.sin_addr, hostinfo, 0);
        else if (lmhosts)
          l_print_hostinfo(dest_sockaddr.sin_addr, hostinfo, 1);
        else 
          print_hostinfo(dest_sockaddr.sin_addr, hostinfo,sf);
      };
      free(hostinfo);
      };

      FD_ZERO(fdsr);
      FD_SET(sock, fdsr);           

      /* check if send_interval time passed since last send */
      gettimeofday(&current_time, NULL);
      timersub(&current_time, &last_send_time, &diff_time);
      send_ok = timercmp(&diff_time, &send_interval, >=);
                  
            
      if(more_to_send && FD_ISSET(sock, fdsw) && send_ok) {
      if(targetlist) {
        if(fgets(str, 80, targetlist)) {
          if(!inet_aton(str, next_in_addr)) {
            /* if(!inet_pton(AF_INET, str, next_in_addr)) { */
            fprintf(stderr,"%s - bad IP address\n", str);
          } else {
            if(!in_list(scanned, ntohl(next_in_addr->s_addr))) 
              send_query(sock, *next_in_addr, rtt_base);
          }
        } else {
          if(feof(targetlist)) {
            more_to_send=0; 
            FD_ZERO(fdsw);
              /* timeout is in milliseconds */
            select_timeout.tv_sec = timeout / 1000;
              select_timeout.tv_usec = (timeout % 1000) * 1000; /* Microseconds */
            continue;
          } else {
            snprintf(errmsg, 80, "Read failed from file %s", filename);
            err_die(errmsg, quiet);
          }
        }
      } else if(next_address(&range, prev_in_addr, next_in_addr) ) {
        if(!in_list(scanned, ntohl(next_in_addr->s_addr))) 
          send_query(sock, *next_in_addr, rtt_base);
        prev_in_addr=next_in_addr;
        /* Update last send time */
        gettimeofday(&last_send_time, NULL); 
      } else { /* No more queries to send */
        more_to_send=0; 
        FD_ZERO(fdsw);
          /* timeout is in milliseconds */
          select_timeout.tv_sec = timeout / 1000;
          select_timeout.tv_usec = (timeout % 1000) * 1000; /* Microseconds */
        continue;
      };
      };    
      if(more_to_send) {
      FD_ZERO(fdsw);
      FD_SET(sock, fdsw);
      };
    };

    if (i>=retransmits) break; /* If we are not going to retransmit
                         we can finish right now without waiting */

    rto = (srtt + 4 * rttvar) * (i+1);

    if ( rto < 2.0 ) rto = 2.0;
    if ( rto > 60.0 ) rto = 60.0;
    gettimeofday(&now, NULL);
            
    if(now.tv_sec < (transmit_started.tv_sec+rto)) 
      sleep((transmit_started.tv_sec+rto)-now.tv_sec);
    prev_in_addr = NULL ;
    more_to_send=1;
    FD_ZERO(fdsw);
    FD_SET(sock, fdsw);
    FD_ZERO(fdsr);
    FD_SET(sock, fdsr);
  };

  delete_list(scanned);
  exit(0);
};


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