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/***************************************************************************
* charpool.cc -- Handles Nmap's "character pool" memory allocation *
* system. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2012 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, version detection, and the Nmap Scripting Engine. *
* *
* 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 interpret that term as broadly as copyright law *
* allows. For example, 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-db 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, as well as other software we distribute under this *
* license such as Zenmap, Ncat, and Nping. This list is not exclusive, *
* but is meant to clarify our interpretation of derived works with some *
* common examples. Our interpretation applies only to Nmap--we don't *
* speak for other people's GPL works. *
* *
* 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. They also fund the *
* continued development of Nmap. 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 docs/licenses/OpenSSL.txt 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 nmap-dev@insecure.org for possible incorporation into the main *
* distribution. By sending these changes to Fyodor or one of the *
* Insecure.Org development mailing lists, or checking them into the Nmap *
* source code repository, it is understood (unless you specify otherwise) *
* that you are offering the Nmap Project (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 v2.0 for more details at *
* http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file *
* included with Nmap. *
* *
***************************************************************************/
/* $Id: charpool.cc 28192 2012-03-01 06:53:35Z fyodor $ */
#include <stddef.h>
#include "nbase.h"
/* Character pool memory allocation */
#include "charpool.h"
#include "nmap_error.h"
static char *charpool[16];
static int currentcharpool;
static int currentcharpoolsz;
static char *nextchar;
/* Allocated blocks are allocated to multiples of ALIGN_ON. This is the
definition used by the malloc in Glibc 2.7, which says that it "suffices for
nearly all current machines and C compilers." */
#define ALIGN_ON (2 * sizeof(size_t))
static int cp_init(void) {
static int charpool_initialized = 0;
if (charpool_initialized) return 0;
/* Create our char pool */
currentcharpool = 0;
currentcharpoolsz = 16384;
nextchar = charpool[0] = (char *) safe_malloc(currentcharpoolsz);
charpool_initialized = 1;
return 0;
}
void cp_free(void) {
int ccp;
for(ccp=0; ccp <= currentcharpool; ccp++)
if(charpool[ccp]){
free(charpool[ccp]);
charpool[ccp] = NULL;
}
currentcharpool = 0;
}
static inline void cp_grow(void) {
/* Doh! We've got to make room */
if (++currentcharpool > 15) {
fatal("Character Pool is out of buckets!");
}
currentcharpoolsz <<= 1;
nextchar = charpool[currentcharpool] = (char *)
safe_malloc(currentcharpoolsz);
}
void *cp_alloc(int sz) {
char *p;
int modulus;
cp_init();
if ((modulus = sz % ALIGN_ON))
sz += ALIGN_ON - modulus;
if ((nextchar - charpool[currentcharpool]) + sz <= currentcharpoolsz) {
p = nextchar;
nextchar += sz;
return p;
}
/* Doh! We've got to make room */
cp_grow();
return cp_alloc(sz);
}
char *cp_strdup(const char *src) {
const char *p;
char *q;
/* end points to the first illegal char */
char *end;
int modulus;
cp_init();
end = charpool[currentcharpool] + currentcharpoolsz;
q = nextchar;
p = src;
while((nextchar < end) && *p) {
*nextchar++ = *p++;
}
if (nextchar < end) {
/* Goody, we have space */
*nextchar++ = '\0';
if ((modulus = (nextchar - q) % ALIGN_ON))
nextchar += ALIGN_ON - modulus;
return q;
}
/* Doh! We ran out -- need to allocate more */
cp_grow();
return cp_strdup(src);
}
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