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b2a1ff8e54
For some reason (probably by imitation of nmap_getservbyport), protocol numbers, which are byte values 0–255, had htons called on them after being read from nmap-protocols. On little-endian platforms, this turned them into integers 0x0100, 0x0200, 0x0300, etc. protocol_table is supposed to be an array of 256 linked lists, linking all the protocol names of the same number. Because of the above htons conversion, all protocols mapped to bucket 0 on lookup instead. Perhaps in an attempt to work around this broken lookup, all protocols were inserted into bucket 0 on init; all other buckets were empty. This worked on little-endian platforms, but on big-endian platforms where htons is a no-op, all protocol numbers but 0 mapped to an empty linked list. Remove all the htons stuff and just look things up by integers. Use the same mapping on initial insertion and on lookup, so that the buckets are acutally populated. This was noticed by hejianet. http://seclists.org/nmap-dev/2012/q3/1005
222 lines
10 KiB
C++
222 lines
10 KiB
C++
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/***************************************************************************
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* protocols.cc -- Functions relating to the protocol scan and mapping *
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* between IPproto Number <-> name. *
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* *
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***********************IMPORTANT NMAP LICENSE TERMS************************
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* *
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* The Nmap Security Scanner is (C) 1996-2012 Insecure.Com LLC. Nmap is *
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* also a registered trademark of Insecure.Com LLC. This program is free *
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* software; you may redistribute and/or modify it under the terms of the *
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* GNU General Public License as published by the Free Software *
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* Foundation; Version 2 with the clarifications and exceptions described *
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* below. This guarantees your right to use, modify, and redistribute *
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* this software under certain conditions. If you wish to embed Nmap *
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* technology into proprietary software, we sell alternative licenses *
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* (contact sales@insecure.com). Dozens of software vendors already *
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* license Nmap technology such as host discovery, port scanning, OS *
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* detection, version detection, and the Nmap Scripting Engine. *
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* *
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* Note that the GPL places important restrictions on "derived works", yet *
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* it does not provide a detailed definition of that term. To avoid *
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* misunderstandings, we interpret that term as broadly as copyright law *
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* "derivative work" for the purpose of this license if it does any of the *
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* included with Nmap. *
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* *
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***************************************************************************/
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/* $Id$ */
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#include "protocols.h"
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#include "NmapOps.h"
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#include "services.h"
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#include "charpool.h"
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#include "nmap_error.h"
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#include "utils.h"
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extern NmapOps o;
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static int numipprots = 0;
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static struct protocol_list *protocol_table[PROTOCOL_TABLE_SIZE];
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static int protocols_initialized = 0;
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static int nmap_protocols_init() {
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if (protocols_initialized) return 0;
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char filename[512];
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FILE *fp;
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char protocolname[128];
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unsigned short protno;
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char *p;
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char line[1024];
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int lineno = 0;
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struct protocol_list *current, *previous;
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int res;
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if (nmap_fetchfile(filename, sizeof(filename), "nmap-protocols") != 1) {
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error("Unable to find nmap-protocols! Resorting to /etc/protocols");
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strcpy(filename, "/etc/protocols");
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}
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fp = fopen(filename, "r");
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if (!fp) {
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fatal("Unable to open %s for reading protocol information", filename);
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}
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/* Record where this data file was found. */
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o.loaded_data_files["nmap-protocols"] = filename;
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memset(protocol_table, 0, sizeof(protocol_table));
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while(fgets(line, sizeof(line), fp)) {
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lineno++;
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p = line;
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while(*p && isspace((int) (unsigned char) *p))
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p++;
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if (*p == '#')
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continue;
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res = sscanf(line, "%127s %hu", protocolname, &protno);
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if (res !=2)
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continue;
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/* Now we make sure our protocols don't have duplicates */
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for(current = protocol_table[protno % PROTOCOL_TABLE_SIZE], previous = NULL;
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current; current = current->next) {
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if (protno == current->protoent->p_proto) {
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if (o.debugging) {
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error("Protocol %d is duplicated in protocols file %s", ntohs(protno), filename);
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}
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break;
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}
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previous = current;
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}
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if (current)
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continue;
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numipprots++;
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current = (struct protocol_list *) cp_alloc(sizeof(struct protocol_list));
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current->protoent = (struct protoent *) cp_alloc(sizeof(struct protoent));
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current->next = NULL;
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if (previous == NULL) {
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protocol_table[protno % PROTOCOL_TABLE_SIZE] = current;
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} else {
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previous->next = current;
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}
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current->protoent->p_name = cp_strdup(protocolname);
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current->protoent->p_proto = protno;
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current->protoent->p_aliases = NULL;
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}
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fclose(fp);
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protocols_initialized = 1;
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return 0;
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}
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/* Adds protocols whose names match mask to porttbl.
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* Increases the prot_count in ports by the number of protocols added.
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* Returns the number of protocols added.
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*/
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int addprotocolsfromservmask(char *mask, u8 *porttbl) {
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struct protocol_list *current;
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int bucket, t=0;
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if (!protocols_initialized && nmap_protocols_init() == -1)
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fatal("%s: Couldn't get protocol numbers", __func__);
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for(bucket = 0; bucket < PROTOCOL_TABLE_SIZE; bucket++) {
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for(current = protocol_table[bucket % PROTOCOL_TABLE_SIZE]; current; current = current->next) {
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if (wildtest(mask, current->protoent->p_name)) {
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porttbl[ntohs(current->protoent->p_proto)] |= SCAN_PROTOCOLS;
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t++;
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}
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}
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}
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return t;
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}
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struct protoent *nmap_getprotbynum(int num) {
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struct protocol_list *current;
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if (nmap_protocols_init() == -1)
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return NULL;
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for(current = protocol_table[num % PROTOCOL_TABLE_SIZE];
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current; current = current->next) {
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if (num == current->protoent->p_proto)
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return current->protoent;
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}
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/* Couldn't find it ... oh well. */
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return NULL;
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}
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