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services.cc

/***************************************************************************
 * services.cc -- Various functions relating to reading the nmap-services  *
 * file and port <-> service mapping                                       *
 *                                                                         *
 ***********************IMPORTANT NMAP LICENSE TERMS************************
 *                                                                         *
 * The Nmap Security Scanner is (C) 1996-2006 Insecure.Com LLC. Nmap is    *
 * also a registered trademark of Insecure.Com LLC.  This program is free  *
 * software; you may redistribute and/or modify it under the terms of the  *
 * GNU General Public License as published by the Free Software            *
 * Foundation; Version 2 with the clarifications and exceptions described  *
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 *   not derivative works.)                                                * 
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 * Source is provided to this software because we believe users have a     *
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 * with Nmap.                                                              *
 *                                                                         *
 ***************************************************************************/

/* $Id: services.cc 3869 2006-08-25 01:47:49Z fyodor $ */

#include "services.h"
#include "NmapOps.h"

extern NmapOps o;
static int numtcpports = 0;
static int numudpports = 0;
static struct service_list *service_table[SERVICE_TABLE_SIZE];

static int nmap_services_init() {
  static int services_initialized = 0;
  if (services_initialized) return 0;

  char filename[512];
  FILE *fp;
  char servicename[128], proto[16];
  u16 portno;
  char *p;
  char line[1024];
  int lineno = 0;
  struct service_list *current, *previous;
  int res;

  if (nmap_fetchfile(filename, sizeof(filename), "nmap-services") == -1) {
#ifndef WIN32
    error("Unable to find nmap-services!  Resorting to /etc/services");
    strcpy(filename, "/etc/services");
#else
      int len, wnt = GetVersion() < 0x80000000;
    error("Unable to find nmap-services!  Resorting to /etc/services");
      if(wnt)
            len = GetSystemDirectory(filename, 480);  //    be safe
      else
            len = GetWindowsDirectory(filename, 480); //    be safe
      if(!len)
            error("Get%sDirectory failed (%d) @#!#@\n",
             wnt ? "System" : "Windows", GetLastError());
      else
      {
            if(wnt)
                  strcpy(filename + len, "\\drivers\\etc\\services");
            else
                  strcpy(filename + len, "\\services");
      }
#endif
  }

  fp = fopen(filename, "r");
  if (!fp) {
    fatal("Unable to open %s for reading service information", filename);
  }

  memset(service_table, 0, sizeof(service_table));
  
  while(fgets(line, sizeof(line), fp)) {
    lineno++;
    p = line;
    while(*p && isspace((int) *p))
      p++;
    if (*p == '#')
      continue;
    res = sscanf(line, "%127s %hu/%15s", servicename, &portno, proto);
    if (res !=3)
      continue;
    portno = htons(portno);

    /* Now we make sure our services doesn't have duplicates */
    for(current = service_table[portno % SERVICE_TABLE_SIZE], previous = NULL;
      current; current = current->next) {
      if (portno == (u16) current->servent->s_port &&
        strcasecmp(proto, current->servent->s_proto) == 0) {
      if (o.debugging) {
        error("Port %d proto %s is duplicated in services file %s", ntohs(portno), proto, filename);
      }
      break;
      }
      previous = current;
    }
    /* Current service in the file was a duplicate, get another one */
    if (current)
      continue;

    if (strncasecmp(proto, "tcp", 3) == 0) {
      numtcpports++;
    } else if (strncasecmp(proto, "udp", 3) == 0) {
      numudpports++;
    } else if (strncasecmp(proto, "ddp", 3) == 0) {
      /* ddp is some apple thing...we don't "do" that */
    } else if (strncasecmp(proto, "divert", 6) == 0) {
      /* divert sockets are for freebsd's natd */
    } else if (strncasecmp(proto, "#", 1) == 0) {
      /* possibly misplaced comment, but who cares? */
    } else {
      if (o.debugging)
      error("Unknown protocol (%s) on line %d of services file %s.", proto, lineno, filename);
      continue;
    }

    current = (struct service_list *) cp_alloc(sizeof(struct service_list));
    current->servent = (struct servent *) cp_alloc(sizeof(struct servent));
    current->next = NULL;
    if (previous == NULL) {
      service_table[portno % SERVICE_TABLE_SIZE] = current;
    } else {
      previous->next = current;
    }
    current->servent->s_name = cp_strdup(servicename);
    current->servent->s_port = portno;
    current->servent->s_proto = cp_strdup(proto);
    current->servent->s_aliases = NULL;
  }
  fclose(fp);
  services_initialized = 1;
  return 0;
}


struct servent *nmap_getservbyport(int port, const char *proto) {
  struct service_list *current;

  if (nmap_services_init() == -1)
    return NULL;

  for(current = service_table[port % SERVICE_TABLE_SIZE];
      current; current = current->next) {
    if (((u16) port == (u16) current->servent->s_port) &&
      strcmp(proto, current->servent->s_proto) == 0)
      return current->servent;
  }

  /* Couldn't find it ... oh well. */
  return NULL;
  
}

/* Be default we do all ports 1-1024 as well as any higher ports
   that are in the services file */
struct scan_lists *getdefaultports(int tcpscan, int udpscan) {
  int tcpportindex = 0;
  int udpportindex = 0;
  struct scan_lists *ports;
  u8 *usedports;
  struct service_list *current;
  int bucket;
  int tcpportsneeded = 0;
  int udpportsneeded = 0;

  if (nmap_services_init() == -1)
    fatal("Getfastports: Couldn't get port numbers");
  
  usedports = (u8 *) safe_zalloc(sizeof(*usedports) * 65536);

  for(bucket = 1; bucket < 1025; bucket++) {  
    if (tcpscan) {
      usedports[bucket] |= SCAN_TCP_PORT;
      tcpportsneeded++;
    }
    if (udpscan) {
      usedports[bucket] |= SCAN_UDP_PORT;
      udpportsneeded++;
    }
  }

  for(bucket = 0; bucket < SERVICE_TABLE_SIZE; bucket++) {  
    for(current = service_table[bucket % SERVICE_TABLE_SIZE];
      current; current = current->next) {
      if (tcpscan &&
        ! (usedports[ntohs(current->servent->s_port)] & SCAN_TCP_PORT) &&
          ! strncmp(current->servent->s_proto, "tcp", 3)) {
      usedports[ntohs(current->servent->s_port)] |= SCAN_TCP_PORT;
      tcpportsneeded++;
      }
      if (udpscan && 
        ! (usedports[ntohs(current->servent->s_port)] & SCAN_UDP_PORT) &&
        !strncmp(current->servent->s_proto, "udp", 3)) {      
      usedports[ntohs(current->servent->s_port)] |= SCAN_UDP_PORT;
      udpportsneeded++;
      }
    }
  }

  ports = (struct scan_lists *) safe_zalloc(sizeof(struct scan_lists));
  if (tcpscan) 
    ports->tcp_ports = (unsigned short *) safe_zalloc((tcpportsneeded) * sizeof(unsigned short));
  if (udpscan) 
    ports->udp_ports = (unsigned short *) safe_zalloc((udpportsneeded) * sizeof(unsigned short));
  ports->tcp_count= tcpportsneeded;
  ports->udp_count= udpportsneeded;

  for(bucket = 0; bucket < 65536; bucket++) {
    if (usedports[bucket] & SCAN_TCP_PORT) 
      ports->tcp_ports[tcpportindex++] = bucket;
    if (usedports[bucket] & SCAN_UDP_PORT) 
      ports->udp_ports[udpportindex++] = bucket;
  }

  free(usedports);
  return ports;
}

struct scan_lists *getfastports(int tcpscan, int udpscan) {
  int tcpportindex = 0;
  int udpportindex = 0;
  struct scan_lists *ports;
  u8 *usedports;
  struct service_list *current;
  int bucket;
  int tcpportsneeded = 0;
  int udpportsneeded = 0;

  if (nmap_services_init() == -1)
    fatal("Getfastports: Couldn't get port numbers");
  
  usedports = (u8 *) safe_zalloc(sizeof(*usedports) * 65536);

  for(bucket = 0; bucket < SERVICE_TABLE_SIZE; bucket++) {  
    for(current = service_table[bucket % SERVICE_TABLE_SIZE];
      current; current = current->next) {
      if (tcpscan  &&
        ! (usedports[ntohs(current->servent->s_port)] & SCAN_TCP_PORT) &&
        !strncmp(current->servent->s_proto, "tcp", 3)) {
      usedports[ntohs(current->servent->s_port)] |= SCAN_TCP_PORT;
      tcpportsneeded++;
      }
      if (udpscan &&
        ! (usedports[ntohs(current->servent->s_port)] & SCAN_UDP_PORT) &&
        !strncmp(current->servent->s_proto, "udp", 3)) {      
      usedports[ntohs(current->servent->s_port)] |= SCAN_UDP_PORT;
      udpportsneeded++;
      }
    }
  }

  ports = (struct scan_lists *) safe_zalloc(sizeof(struct scan_lists));
  if (tcpscan) 
    ports->tcp_ports = (unsigned short *) safe_zalloc((tcpportsneeded) * sizeof(unsigned short));
  if (udpscan)
    ports->udp_ports = (unsigned short *) safe_zalloc((udpportsneeded) * sizeof(unsigned short));
  ports->tcp_count= tcpportsneeded;
  ports->udp_count= udpportsneeded;

  for(bucket = 0; bucket < 65536; bucket++) {
    if (usedports[bucket] & SCAN_TCP_PORT) 
      ports->tcp_ports[tcpportindex++] = bucket;
    if (usedports[bucket] & SCAN_UDP_PORT) 
      ports->udp_ports[udpportindex++] = bucket;
  }

  free(usedports);
  return ports;
}


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