/***************************************************************************
 * portlist.cc -- Functions for manipulating various lists of ports        *
 * maintained internally by Nmap.                                          *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
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 * also a registered trademark of Insecure.Com LLC.  This program is free  *
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 ***************************************************************************/

/* $Id: portlist.cc 12776 2009-03-31 04:16:12Z fyodor $ */


#include "portlist.h"
#include "nmap_error.h"
#include "nmap.h"
#include "NmapOps.h"
#include "services.h"
#include "nmap_rpc.h"
#include "tcpip.h"

using namespace std;

#if HAVE_STRINGS_H
#include <strings.h>
#endif /* HAVE_STRINGS_H */

extern NmapOps o;  /* option structure */

Port::Port() {
  portno = proto = 0;
  owner = NULL;
  rpc_status = RPC_STATUS_UNTESTED;
  rpc_program = rpc_lowver = rpc_highver = 0;
  state = 0;
  next = NULL;
  serviceprobe_results = PROBESTATE_INITIAL;
  serviceprobe_service = NULL;
  serviceprobe_product = serviceprobe_version = serviceprobe_extrainfo = NULL;
  serviceprobe_hostname = serviceprobe_ostype = serviceprobe_devicetype = NULL;
  serviceprobe_tunnel = SERVICE_TUNNEL_NONE;
  serviceprobe_fp = NULL;
  state_reason_init(&reason);
}

Port::~Port() {
 if (owner)
   free(owner);
 if (serviceprobe_product)
   free(serviceprobe_product);
 if (serviceprobe_version)
   free(serviceprobe_version);
 if (serviceprobe_extrainfo)
   free(serviceprobe_extrainfo);
 if (serviceprobe_hostname)
   free(serviceprobe_hostname);
 if (serviceprobe_ostype)
   free(serviceprobe_ostype);
 if (serviceprobe_devicetype)
   free(serviceprobe_devicetype);
 if (serviceprobe_service)
   free(serviceprobe_service);
 if (serviceprobe_fp)
   free(serviceprobe_fp);
}

// Uses the sd->{product,version,extrainfo} if available to fill
// out sd->fullversion.  If unavailable, it will be set to zero length.
static void populateFullVersionString(struct serviceDeductions *sd) {
  char *dst = sd->fullversion;
  unsigned int spaceleft = sizeof(sd->fullversion) - 1;

  dst[0] = '\0';

  if (sd->product && spaceleft >= strlen(sd->product)) {
    strncat(dst, sd->product, spaceleft);
    spaceleft -= strlen(sd->product);
  }

  if (sd->version && spaceleft >= (strlen(sd->version) + 1)) {
    strncat(dst, " ", spaceleft);
    strncat(dst, sd->version, spaceleft);
    spaceleft -= strlen(sd->version) + 1;
  }

  if (sd->extrainfo && spaceleft >= (strlen(sd->extrainfo) + 3)) {
    strncat(dst, " (", spaceleft);
    strncat(dst, sd->extrainfo, spaceleft);
    strncat(dst, ")", spaceleft);
    spaceleft -= strlen(sd->extrainfo) + 3;
  }

}


// pass in an allocated struct serviceDeductions (don't worry about
// initializing, and you don't have to free any internal ptrs.  See the
// serviceDeductions definition for the fields that are populated.
// Returns 0 if at least a name is available.
int Port::getServiceDeductions(struct serviceDeductions *sd) {
  struct servent *service;

  assert(sd);
  memset(sd, 0, sizeof(struct serviceDeductions));
  sd->service_fp = serviceprobe_fp;
  sd->service_tunnel = serviceprobe_tunnel;
  sd->rpc_status = rpc_status;
  sd->rpc_program = rpc_program;
  sd->rpc_lowver = rpc_lowver;
  sd->rpc_highver = rpc_highver;

  // First priority is RPC
  if (rpc_status == RPC_STATUS_UNKNOWN || rpc_status == RPC_STATUS_GOOD_PROG ) {
    assert(serviceprobe_service);
    sd->name = serviceprobe_service;
    sd->name_confidence = (rpc_status == RPC_STATUS_UNKNOWN)? 8 : 10;
    sd->dtype = SERVICE_DETECTION_PROBED; // RPC counts as probed
    sd->version = serviceprobe_version;
    sd->extrainfo = serviceprobe_extrainfo;
    sd->hostname = serviceprobe_hostname;
    sd->ostype = serviceprobe_ostype;
    sd->devicetype = serviceprobe_devicetype;
    populateFullVersionString(sd);
    return 0;
  } else if (serviceprobe_results == PROBESTATE_FINISHED_HARDMATCHED
	     || serviceprobe_results == PROBESTATE_FINISHED_SOFTMATCHED) {
    assert(serviceprobe_service);
    sd->dtype = SERVICE_DETECTION_PROBED;
    sd->name = serviceprobe_service;
    sd->name_confidence = 10;
    sd->product = serviceprobe_product;
    sd->version = serviceprobe_version;
    sd->extrainfo = serviceprobe_extrainfo;
    sd->hostname = serviceprobe_hostname;
    sd->ostype = serviceprobe_ostype;
    sd->devicetype = serviceprobe_devicetype;
    populateFullVersionString(sd);
    return 0;
  } else if (serviceprobe_results == PROBESTATE_EXCLUDED) {
    service = nmap_getservbyport(htons(portno), (proto == IPPROTO_TCP)? "tcp" : "udp");

    if (service) sd->name = service->s_name;

    sd->name_confidence = 2;  // Since we didn't even check it, we aren't very confident
    sd->dtype = SERVICE_DETECTION_TABLE;
    sd->product = serviceprobe_product;  // Should have a string that says port was excluded
    populateFullVersionString(sd);
    return 0;
  } else if (serviceprobe_results == PROBESTATE_FINISHED_TCPWRAPPED) {
    sd->dtype = SERVICE_DETECTION_PROBED;
    sd->name = "tcpwrapped";
    sd->name_confidence = 8;
    return 0;
  }

  // So much for service detection or RPC.  Maybe we can find it in the file
  service = nmap_getservbyport(htons(portno), (proto == IPPROTO_TCP)? "tcp" : "udp");
  if (service) {
    sd->dtype = SERVICE_DETECTION_TABLE;
    sd->name = service->s_name;
    sd->name_confidence = 3;
    return 0;
  }
  
  // Couldn't find it.  [shrug]
  return -1;

}


// sname should be NULL if sres is not
// PROBESTATE_FINISHED_MATCHED. product,version, and/or extrainfo
// will be NULL if unavailable. Note that this function makes its
// own copy of sname and product/version/extrainfo.  This function
// also takes care of truncating the version strings to a
// 'reasonable' length if neccessary, and cleaning up any unprintable
// chars. (these tests are to avoid annoying DOS (or other) attacks
// by malicious services).  The fingerprint should be NULL unless
// one is available and the user should submit it.  tunnel must be
// SERVICE_TUNNEL_NULL (normal) or SERVICE_TUNNEL_SSL (means ssl was
// detected and we tried to tunnel through it ).

char* Port::cstringSanityCheck(const char* string, int len) {
	char* result;
  int slen;

  if(!string)
	  return NULL;

  slen = strlen(string);
  if (slen > len) slen = len;
  result = (char *) safe_malloc(slen + 1);
  memcpy(result, string, slen);
  result[slen] = '\0';
  replacenonprintable(result, slen, '.'); 
  return result;
}

void Port::setServiceProbeResults(enum serviceprobestate sres, 
				  const char *sname,	
				  enum service_tunnel_type tunnel, 
				  const char *product, const char *version, 
				  const char *extrainfo, const char *hostname,
				  const char *ostype, const char *devicetype,
				  const char *fingerprint) {

	serviceprobe_results = sres;
	serviceprobe_tunnel = tunnel;

	if (sname) 
		serviceprobe_service = strdup(sname);
	else
		sname = NULL;

	if (fingerprint) 
		serviceprobe_fp = strdup(fingerprint);
	else 
		serviceprobe_fp = NULL;

	serviceprobe_product = cstringSanityCheck(product, 64);
	serviceprobe_version = cstringSanityCheck(version, 64);
	serviceprobe_extrainfo = cstringSanityCheck(extrainfo, 128);
	serviceprobe_hostname = cstringSanityCheck(hostname, 64);
	serviceprobe_ostype = cstringSanityCheck(ostype, 64);
	serviceprobe_devicetype = cstringSanityCheck(devicetype, 64);
}

/* Sets the results of an RPC scan.  if rpc_status is not
   RPC_STATUS_GOOD_PROGRAM, pass 0 for the other args.  This function
   takes care of setting the port's service and version appropriately. */
void Port::setRPCProbeResults(int rpcs, unsigned long rpcp, 
			unsigned int rpcl, unsigned int rpch) {
  rpc_status = rpcs;
  const char *newsvc;
  char verbuf[128];

  rpc_status = rpcs;
  if (rpc_status == RPC_STATUS_GOOD_PROG) {
    rpc_program = rpcp;
    rpc_lowver = rpcl;
    rpc_highver = rpch;

    // Now set the service/version info
    newsvc = nmap_getrpcnamebynum(rpcp);
    if (!newsvc) newsvc = "rpc.unknownprog"; // should never happen
    if (serviceprobe_service)
      free(serviceprobe_service);
    serviceprobe_service = strdup(newsvc);
    serviceprobe_product = strdup(newsvc);
    if (rpc_lowver == rpc_highver)
      Snprintf(verbuf, sizeof(verbuf), "%i", rpc_lowver);
    else
      Snprintf(verbuf, sizeof(verbuf), "%i-%i", rpc_lowver, rpc_highver);
    serviceprobe_version = strdup(verbuf);
    Snprintf(verbuf, sizeof(verbuf), "rpc #%li", rpc_program);
    serviceprobe_extrainfo = strdup(verbuf);
  } else if (rpc_status == RPC_STATUS_UNKNOWN) {
    if (serviceprobe_service)
      free(serviceprobe_service);
    
    serviceprobe_service = strdup("rpc.unknown");
  }
}

/*****************************************************************************/
/* Convert protocol name from in.h to enum portlist_proto.
 * So IPPROTO_TCP will be changed to PORTLIST_PROTO_TCP and so on. */
#define INPROTO2PORTLISTPROTO(p)		\
  ((p)==IPPROTO_TCP ? PORTLIST_PROTO_TCP :	\
   (p)==IPPROTO_UDP ? PORTLIST_PROTO_UDP :	\
   PORTLIST_PROTO_IP)


PortList::PortList() {
  int proto;
  memset(state_counts_proto, 0, sizeof(state_counts_proto));
  memset(port_list, 0, sizeof(port_list));

  for(proto=0; proto < PORTLIST_PROTO_MAX; proto++) {
    if(port_list_count[proto] > 0)
      port_list[proto] = (Port**) safe_zalloc(sizeof(Port*)*port_list_count[proto]);
  }

  numports = 0;
  numscriptresults = 0;
  idstr = NULL;
}

PortList::~PortList() {
  int proto, i;

  if (idstr) { 
    free(idstr);
    idstr = NULL;
  }

  for(proto=0; proto < PORTLIST_PROTO_MAX; proto++) { // for every protocol
    if(port_list[proto]) {
      for(i=0; i < port_list_count[proto]; i++) { // free every Port 
        if(port_list[proto][i]) 
          delete port_list[proto][i];
      }
      free(port_list[proto]);
    }
  }
}


int PortList::addPort(u16 portno, u8 protocol, char *owner, int state) {
  Port *current;
  char msg[128];
  int proto = INPROTO2PORTLISTPROTO(protocol);

  assert(state < PORT_HIGHEST_STATE);

  if ((state == PORT_OPEN && o.verbose) || (o.debugging > 1)) {
    if (owner && *owner) {
      Snprintf(msg, sizeof(msg), " (owner: %s)", owner);
    } else msg[0] = '\0';
    
    log_write(LOG_STDOUT, "Discovered %s port %hu/%s%s%s\n",
	      statenum2str(state), portno, 
	      proto2ascii(protocol), msg, idstr? idstr : "");
    log_flush(LOG_STDOUT);
  }


  /* Make sure state is OK */
  if (state != PORT_OPEN && state != PORT_CLOSED && state != PORT_FILTERED &&
      state != PORT_UNFILTERED && state != PORT_OPENFILTERED && 
      state != PORT_CLOSEDFILTERED)
    fatal("%s: attempt to add port number %d with illegal state %d\n", __func__, portno, state);

  assert(protocol!=IPPROTO_IP || portno<256);

  current = getPortEntry(portno, protocol);
  if (current) {
    /* We must discount our statistics from the old values.  Also warn
       if a complete duplicate */
    if (o.debugging && current->state == state && (!owner || !*owner)) {
      error("Duplicate port (%hu/%s)", portno, proto2ascii(protocol));
    } 
    state_counts_proto[proto][current->state]--;
  } else {
    current = new Port();
    current->portno = portno;
    current->proto = protocol;
    numports++;
    
    setPortEntry(portno, protocol, current);
  }
  
  current->state = state;
  state_counts_proto[proto][state]++;

  if (owner && *owner) {
    if (current->owner)
      free(current->owner);
    current->owner = strdup(owner);
  }
 
  if(state == PORT_FILTERED || state == PORT_OPENFILTERED)
  	setStateReason(portno, protocol, ER_NORESPONSE, 0, 0); 
  return 0; /*success */
}

int PortList::removePort(u16 portno, u8 protocol) {
  Port *answer = NULL;

  log_write(LOG_PLAIN, "Removed %d\n", portno);

  answer = getPortEntry(portno, protocol);
  if (!answer)
    return -1;

  setPortEntry(portno, protocol, NULL);

  if (o.verbose) {  
    log_write(LOG_STDOUT, "Deleting port %hu/%s, which we thought was %s\n",
	      portno, proto2ascii(answer->proto),
	      statenum2str(answer->state));
    log_flush(LOG_STDOUT);
  }    

  /* Discount statistics */
  state_counts_proto[INPROTO2PORTLISTPROTO(protocol)][answer->state]--;
  numports--;

  delete answer;
  return 0;
}

  /* Saves an identification string for the target containing these
     ports (an IP address might be a good example, but set what you
     want).  Only used when printing new port updates.  Optional.  A
     copy is made. */
void PortList::setIdStr(const char *id) {
  int len = 0;
  if (idstr) free(idstr);
  if (!id) { idstr = NULL; return; }
  len = strlen(id);
  len += 5; // " on " + \0
  idstr = (char *) safe_malloc(len);
  Snprintf(idstr, len, " on %s", id);
}


int PortList::getStateCounts(int protocol, int state){
  return(state_counts_proto[INPROTO2PORTLISTPROTO(protocol)][state]);
}

int PortList::getStateCounts(int state){
  int sum=0, proto;
  for(proto=0; proto < PORTLIST_PROTO_MAX; proto++)
    sum += state_counts_proto[proto][state];
  return(sum);
}

  /* A function for iterating through the ports.  Give NULL for the
   first "afterthisport".  Then supply the most recent returned port
   for each subsequent call.  When no more matching ports remain, NULL
   will be returned.  To restrict returned ports to just one protocol,
   specify IPPROTO_TCP or IPPROTO_UDP for allowed_protocol. A TCPANDUDP
   for allowed_protocol matches either. A 0 for allowed_state matches 
   all possible states. This function returns ports in numeric
   order from lowest to highest, except that if you ask for both TCP &
   UDP, every TCP port will be returned before we start returning UDP
   ports */
Port *PortList::nextPort(Port *afterthisport, 
			 int allowed_protocol, int allowed_state) {
  int proto;
  int mapped_pno;
  Port *port;
  
  if(afterthisport) {
    proto = INPROTO2PORTLISTPROTO(afterthisport->proto);
    assert(port_map[proto]!=NULL); // Hmm, it's not posible to handle port that doesn't have anything in map
    assert(afterthisport->proto!=IPPROTO_IP || afterthisport->portno<256);
    mapped_pno = port_map[proto][afterthisport->portno];
    mapped_pno++; //  we're interested in next port after current
  }else { // running for the first time
    if(allowed_protocol == TCPANDUDP)	// if both protocols, then first search TCP
      proto = INPROTO2PORTLISTPROTO(IPPROTO_TCP);
    else
      proto = INPROTO2PORTLISTPROTO(allowed_protocol);
    mapped_pno = 0;
  }
  
  if(port_list[proto] != NULL) {
    for(;mapped_pno < port_list_count[proto]; mapped_pno++) {
      port = port_list[proto][mapped_pno];
      if(port && (allowed_state==0 || port->state==allowed_state))
        return(port);
    }
  }
  
  /* if all protocols, than after TCP search UDP */
  if(allowed_protocol == TCPANDUDP && proto == INPROTO2PORTLISTPROTO(IPPROTO_TCP))
    return(nextPort(NULL, IPPROTO_UDP, allowed_state));
  
  return(NULL); 
}
      
Port *PortList::getPortEntry(u16 portno, u8 protocol) {
  int proto = INPROTO2PORTLISTPROTO(protocol);
  int mapped_pno;

  assert(protocol!=IPPROTO_IP || portno<256);
  if(port_map[proto]==NULL || port_list[proto]==NULL)
    fatal("%s(%i,%i): you're trying to access uninitialized protocol", __func__, portno, protocol);
  mapped_pno = port_map[proto][portno];

  assert(mapped_pno < port_list_count[proto]);
  assert(mapped_pno >= 0);
  
  /* The ugly hack: we allow only port 0 to be mapped to 0 position */
  if(mapped_pno==0 && portno!=0) {
    error("WARNING: %s(%i,%i): this port was not mapped", __func__, portno, protocol);
    return(NULL);
  }else
    return(port_list[proto][mapped_pno]);
}

void PortList::setPortEntry(u16 portno, u8 protocol, Port *port) {
  int proto = INPROTO2PORTLISTPROTO(protocol);
  int mapped_pno;

  assert(protocol!=IPPROTO_IP || portno<256);
  if(port_map[proto]==NULL || port_list[proto]==NULL)
    fatal("%s(%i,%i): you're trying to access uninitialized protocol", __func__, portno, protocol);
  mapped_pno = port_map[proto][portno];

  assert(mapped_pno < port_list_count[proto]);
  assert(mapped_pno >= 0);
  
  /* The ugly hack: we allow only port 0 to be mapped to 0 position */
  if(mapped_pno==0 && portno!=0) {
    error("WARNING: %s(%i,%i): this port was not mapped", __func__, portno, protocol);
    return;
  }
  
  port_list[proto][mapped_pno] = port;
}

/* Just free memory used by PortList::port_map[]. Should be done somewhere 
 * before closing nmap. */
void PortList::freePortMap(){
  int proto;
  for(proto=0; proto < PORTLIST_PROTO_MAX; proto++)
    if(port_map[proto]){
      free(port_map[proto]);
      port_map[proto] = NULL;
  }
}
  

u16 *PortList::port_map[PORTLIST_PROTO_MAX];
int PortList::port_list_count[PORTLIST_PROTO_MAX];

/* This function must be runned before any PortList object is created.
 * It must be runned for every used protocol. The data in "ports" 
 * should be sorted. */
void PortList::initializePortMap(int protocol, u16 *ports, int portcount) {
  int i;
  int unused_zero;	// aren't we using 0 port?
  int ports_max = (protocol == IPPROTO_IP) ? 256 : 65536;
  int proto = INPROTO2PORTLISTPROTO(protocol);
  
  if(port_map[proto]!=NULL)
    fatal("%s: portmap for protocol %i already initialized", __func__, protocol);

  assert(port_list_count[proto]==0);
  
  /* this memory will never be freed, but this is the way it has to be. */
  port_map[proto] = (u16*) safe_zalloc(sizeof(u16)*ports_max);

  /* Is zero port to be unused? */
  if(portcount==0 || ports[0]!=0)
    unused_zero = 1;
  else
    unused_zero = 0;
  
  /* The ugly hack: if we don't use 0 port, than we need one more extra element. */
  port_list_count[proto] = portcount + unused_zero;
  
  for(i=0; i < portcount; i++) {
    /* The ugly hack: if we don't use 0 port, than we must start counting from 1 */
    port_map[proto][ports[i]] = i + unused_zero; // yes, this is the key line
  }
  /* So now port_map should have such structure (lets scan 2nd,4th and 6th port):
   * 	port_map[0,0,1,0,2,0,3,...]	        <- indexes to port_list structure
   * 	port_list[0,port_2,port_4,port_6]
   * But if we scan 0, 2, and 4 port:
   * 	port_map[0,0,1,0,2,...]		// yes, this 0 in first place isn't mistake
   * 	port_list[port_0,port_2,port_4] 
   * And in both cases we scan three ports. Ugly, isn't it? :) */
}

  /* Cycles through the 0 or more "ignored" ports which should be
   consolidated for Nmap output.  They are returned sorted by the
   number of prots in the state, starting with the most common.  It
   should first be called with PORT_UNKNOWN to obtain the most popular
   ignored state (if any).  Then call with that state to get the next
   most popular one.  Returns the state if there is one, but returns
   PORT_UNKNOWN if there are no (more) states which qualify for
   consolidation */
int PortList::nextIgnoredState(int prevstate) {

  int beststate = PORT_UNKNOWN;
  
  for(int state=0; state < PORT_HIGHEST_STATE; state++) {
    /* The state must be ignored */
    if (!isIgnoredState(state)) 
      continue;

    /* We can't give the same state again ... */
    if (state == prevstate) continue;

    /* If a previous state was given, we must have fewer ports than
       that one, or be tied but be a larger state number */
    if (prevstate != PORT_UNKNOWN && 
	(getStateCounts(state) > getStateCounts(prevstate) ||
	 (getStateCounts(state) == getStateCounts(prevstate) && state <= prevstate)))
      continue;

    /* We only qualify if we have more ports than the current best */
    if (beststate != PORT_UNKNOWN && getStateCounts(beststate) >= getStateCounts(state))
      continue;

    /* Yay!  We found the best state so far ... */
    beststate = state;
  }

  return beststate;
}

/* Returns true if a state should be ignored (consolidated), false otherwise */
bool PortList::isIgnoredState(int state) {

  if (o.debugging > 2)
    return false;

  if (state == PORT_OPEN || state == PORT_UNKNOWN || state == PORT_TESTING ||
      state == PORT_FRESH)
    return false; /* Cannot be ignored */

  if (state == PORT_OPENFILTERED && (o.verbose > 2 || o.debugging > 2))
    return false;

  /* If openonly, we always ignore states that don't at least have open
     as a possibility. */
  if (o.openOnly() && state != PORT_OPENFILTERED && state != PORT_UNFILTERED 
      && getStateCounts(state) > 0)
    return true;

  int max_per_state = 25; // Ignore states with more ports than this
  /* We will show more ports when verbosity is requested */
  if (o.verbose || o.debugging) {
    if (o.ipprotscan)
      max_per_state *= (o.verbose + 3 * o.debugging);
    else
      max_per_state *= (o.verbose + 20 * o.debugging);
  }

  if (getStateCounts(state) > max_per_state)
    return true;

  return false;
}

int PortList::numIgnoredStates() {
  int numstates = 0;
  for(int state=0; state < PORT_HIGHEST_STATE; state++) {
    if (isIgnoredState(state))
      numstates++;
  }
  return numstates;
}

int PortList::numIgnoredPorts() {

  int numports = 0;
  for(int state=0; state < PORT_HIGHEST_STATE; state++) {
    if (isIgnoredState(state))
      numports += getStateCounts(state);
  }
  return numports;
}

int PortList::setStateReason(u16 portno, u8 proto, reason_t reason, u8 ttl, u32 ip_addr) {
    Port *answer = NULL;

    if(!(answer = getPortEntry(portno, proto))) 
       	return -1;
    if(reason > ER_MAX)
        return -1;

    /* set new reason and increment its count */
    answer->reason.reason_id = reason;
    answer->reason.ip_addr.s_addr = ip_addr;
	answer->reason.ttl = ttl;
    answer->reason.state = answer->state;
    setPortEntry(portno, proto, answer);
    return 0;
}

// Move some popular TCP ports to the beginning of the portlist, because
// that can speed up certain scans.  You should have already done any port
// randomization, this should prevent the ports from always coming out in the
// same order.
void random_port_cheat(u16 *ports, int portcount) {
  int allportidx = 0;
  int popportidx = 0;
  int earlyreplidx = 0;
  /* Updated 2008-12-19 from nmap-services-all.
     Top 25 open TCP ports plus 113, 554, and 256 */
  u16 pop_ports[] = {
    80, 23, 443, 21, 22, 25, 3389, 110, 445, 139,
    143, 53, 135, 3306, 8080, 1723, 111, 995, 993, 5900,
    1025, 587, 8888, 199, 1720,
    113, 554, 256
  };
  int num_pop_ports = sizeof(pop_ports) / sizeof(u16);

  for(allportidx = 0; allportidx < portcount; allportidx++) {
    // see if the currentport is a popular port
    for(popportidx = 0; popportidx < num_pop_ports; popportidx++) {
      if (ports[allportidx] == pop_ports[popportidx]) {
	// This one is popular!  Swap it near to the beginning.
	if (allportidx != earlyreplidx) {
	  ports[allportidx] = ports[earlyreplidx];
	  ports[earlyreplidx] = pop_ports[popportidx];
	}
	earlyreplidx++;
	break;
      }
    }
  }
}

