/*************************************************************************** * protocols.cc -- Functions relating to the protocol scan and mapping     * * between IPproto Number <-> name.                                        * *                                                                         * ***********************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  * * below.  This guarantees your right to use, modify, and redistribute     * * this software under certain conditions.  If you wish to embed Nmap      * * technology into proprietary software, we sell alternative licenses      * * (contact sales@insecure.com).  Dozens of software vendors already       * * license Nmap technology such as host discovery, port scanning, OS       * * detection, and version detection.                                       * *                                                                         * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term.  To avoid       * * misunderstandings, we consider an application to constitute a           * * "derivative work" for the purpose of this license if it does any of the * * following:                                                              * * o Integrates source code from Nmap                                      * * o Reads or includes Nmap copyrighted data files, such as                * *   nmap-os-fingerprints or nmap-service-probes.                          * * o Executes Nmap and parses the results (as opposed to typical shell or  * *   execution-menu apps, which simply display raw Nmap output and so are  * *   not derivative works.)                                                *  * o Integrates/includes/aggregates Nmap into a proprietary executable     * *   installer, such as those produced by InstallShield.                   * * o Links to a library or executes a program that does any of the above   * *                                                                         * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap.  This list is not exclusive, but is just meant to        * * clarify our interpretation of derived works with some common examples.  * * These restrictions only apply when you actually redistribute Nmap.  For * * example, nothing stops you from writing and selling a proprietary       * * front-end to Nmap.  Just distribute it by itself, and point people to   * * http://insecure.org/nmap/ to download Nmap.                             * *                                                                         * * We don't consider these to be added restrictions on top of the GPL, but * * just a clarification of how we interpret "derived works" as it applies  * * to our GPL-licensed Nmap product.  This is similar to the way Linus     * * Torvalds has announced his interpretation of how "derived works"        * * applies to Linux kernel modules.  Our interpretation refers only to     * * Nmap - we don't speak for any other GPL products.                       * *                                                                         * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help.  As mentioned above,  * * we also offer alternative license to integrate Nmap into proprietary    * * applications and appliances.  These contracts have been sold to dozens  * * of software vendors, and generally include a perpetual license as well  * * as providing for priority support and updates as well as helping to     * * fund the continued development of Nmap technology.  Please email        * * sales@insecure.com for further information.                             * *                                                                         * * As a special exception to the GPL terms, Insecure.Com LLC grants        * * permission to link the code of this program with any version of the     * * OpenSSL library which is distributed under a license identical to that  * * listed in the included Copying.OpenSSL file, and distribute linked      * * combinations including the two. You must obey the GNU GPL in all        * * respects for all of the code used other than OpenSSL.  If you modify    * * this file, you may extend this exception to your version of the file,   * * but you are not obligated to do so.                                     * *                                                                         * * If you received these files with a written license agreement or         * * contract stating terms other than the terms above, then that            * * alternative license agreement takes precedence over these comments.     * *                                                                         * * Source is provided to this software because we believe users have a     * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes (none     * * have been found so far).                                                * *                                                                         * * Source code also allows you to port Nmap to new platforms, fix bugs,    * * and add new features.  You are highly encouraged to send your changes   * * to fyodor@insecure.org for possible incorporation into the main         * * distribution.  By sending these changes to Fyodor or one the            * * Insecure.Org development mailing lists, it is assumed that you are      * * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right * * to reuse, modify, and relicense the code.  Nmap will always be          * * available Open Source, but this is important because the inability to   * * relicense code has caused devastating problems for other Free Software  * * projects (such as KDE and NASM).  We also occasionally relicense the    * * code to third parties as discussed above.  If you wish to specify       * * special license conditions of your contributions, just say so when you  * * send them.                                                              * *                                                                         * * This program is distributed in the hope that it will be useful, but     * * WITHOUT ANY WARRANTY; without even the implied warranty of              * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       * * General Public License for more details at                              * * http://www.gnu.org/copyleft/gpl.html , or in the COPYING file included  * * with Nmap.                                                              * *                                                                         * ***************************************************************************//* $Id: protocols.cc 3943 2006-09-05 08:39:32Z fyodor $ */#include "protocols.h"#include "NmapOps.h"extern NmapOps o;static int numipprots = 0;static struct protocol_list *protocol_table[PROTOCOL_TABLE_SIZE];static int nmap_protocols_init() {  static int protocols_initialized = 0;  if (protocols_initialized) return 0;  char filename[512];  FILE *fp;  char protocolname[128];  unsigned short protno;  char *p;  char line[1024];  int lineno = 0;  struct protocol_list *current, *previous;  int res;  if (nmap_fetchfile(filename, sizeof(filename), "nmap-protocols") == -1) {    error("Unable to find nmap-protocols!  Resorting to /etc/protocol");    strcpy(filename, "/etc/protocols");  }  fp = fopen(filename, "r");  if (!fp) {    fatal("Unable to open %s for reading protocol information", filename);  }  memset(protocol_table, 0, sizeof(protocol_table));    while(fgets(line, sizeof(line), fp)) {    lineno++;    p = line;    while(*p && isspace((int) *p))      p++;    if (*p == '#')      continue;    res = sscanf(line, "%127s %hu", protocolname, &protno);    if (res !=2)      continue;    protno = htons(protno);    /* Now we make sure our protocols don't have duplicates */    for(current = protocol_table[0], previous = NULL;	current; current = current->next) {      if (protno == current->protoent->p_proto) {	if (o.debugging) {	  error("Protocol %d is duplicated in protocols file %s", ntohs(protno), filename);	}	break;      }      previous = current;    }    if (current)      continue;    numipprots++;    current = (struct protocol_list *) cp_alloc(sizeof(struct protocol_list));    current->protoent = (struct protoent *) cp_alloc(sizeof(struct protoent));    current->next = NULL;    if (previous == NULL) {      protocol_table[protno] = current;    } else {      previous->next = current;    }    current->protoent->p_name = cp_strdup(protocolname);    current->protoent->p_proto = protno;    current->protoent->p_aliases = NULL;  }  fclose(fp);  protocols_initialized = 1;  return 0;}struct protoent *nmap_getprotbynum(int num) {  struct protocol_list *current;  if (nmap_protocols_init() == -1)    return NULL;  for(current = protocol_table[num % PROTOCOL_TABLE_SIZE];      current; current = current->next) {    if (num == current->protoent->p_proto)      return current->protoent;  }  /* Couldn't find it ... oh well. */  return NULL;  }/* By default we do all prots 0-255. */struct scan_lists *getdefaultprots(void) {  int protindex = 0;  struct scan_lists *scanlist;  /*struct protocol_list *current;*/  int bucket;  int protsneeded = 256;  if (nmap_protocols_init() == -1)    fatal("getdefaultprots(): Couldn't get protocol numbers");    scanlist = (struct scan_lists *) safe_zalloc(sizeof(struct scan_lists));  scanlist->prots = (unsigned short *) safe_zalloc((protsneeded) * sizeof(unsigned short));  scanlist->prot_count = protsneeded;  for(bucket = 0; bucket < protsneeded; bucket++) {    scanlist->prots[protindex++] = bucket;  }  return scanlist;}struct scan_lists *getfastprots(void) {  int protindex = 0;  struct scan_lists *scanlist;  char usedprots[256];  struct protocol_list *current;  int bucket;  int protsneeded = 0;  if (nmap_protocols_init() == -1)    fatal("Getfastprots: Couldn't get protocol numbers");    memset(usedprots, 0, sizeof(usedprots));  for(bucket = 0; bucket < PROTOCOL_TABLE_SIZE; bucket++) {      for(current = protocol_table[bucket % PROTOCOL_TABLE_SIZE];	current; current = current->next) {      if (!usedprots[ntohs(current->protoent->p_proto)])	usedprots[ntohs(current->protoent->p_proto)] = 1;	protsneeded++;    }  }  scanlist = (struct scan_lists *) safe_zalloc(sizeof(struct scan_lists));  scanlist->prots = (unsigned short *) safe_zalloc((protsneeded ) * sizeof(unsigned short));  scanlist->prot_count = protsneeded;  for(bucket = 0; bucket < 256; bucket++) {    if (usedprots[bucket])      scanlist->prots[protindex++] = bucket;  }  return scanlist;}