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| /*************************************************************************** | |
| * charpool.cc -- Handles Nmap's "character pool" memory allocation * | |
| * system. * | |
| * * | |
| ***********************IMPORTANT NMAP LICENSE TERMS************************ | |
| * * | |
| * The Nmap Security Scanner is (C) 1996-2021 Nmap Software LLC ("The Nmap * | |
| * Project"). Nmap is also a registered trademark of the Nmap Project. * | |
| * * | |
| * This program is distributed under the terms of the Nmap Public Source * | |
| * License (NPSL). The exact license text applying to a particular Nmap * | |
| * release or source code control revision is contained in the LICENSE * | |
| * file distributed with that version of Nmap or source code control * | |
| * revision. More Nmap copyright/legal information is available from * | |
| * https://nmap.org/book/man-legal.html, and further information on the * | |
| * NPSL license itself can be found at https://nmap.org/npsl. This header * | |
| * summarizes some key points from the Nmap license, but is no substitute * | |
| * for the actual license text. * | |
| * * | |
| * Nmap is generally free for end users to download and use themselves, * | |
| * including commercial use. It is available from https://nmap.org. * | |
| * * | |
| * The Nmap license generally prohibits companies from using and * | |
| * redistributing Nmap in commercial products, but we sell a special Nmap * | |
| * OEM Edition with a more permissive license and special features for * | |
| * this purpose. See https://nmap.org/oem * | |
| * * | |
| * If you have received a written Nmap license agreement or contract * | |
| * stating terms other than these (such as an Nmap OEM license), you may * | |
| * choose to use and redistribute Nmap under those terms instead. * | |
| * * | |
| * The official Nmap Windows builds include the Npcap software * | |
| * (https://npcap.org) for packet capture and transmission. It is under * | |
| * separate license terms which forbid redistribution without special * | |
| * permission. So the official Nmap Windows builds may not be * | |
| * redistributed without special permission (such as an Nmap OEM * | |
| * license). * | |
| * * | |
| * 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. * | |
| * * | |
| * Source code also allows you to port Nmap to new platforms, fix bugs, * | |
| * and add new features. You are highly encouraged to submit your * | |
| * changes as a Github PR or by email to the [email protected] mailing list * | |
| * for possible incorporation into the main distribution. Unless you * | |
| * specify otherwise, it is understood that you are offering us very * | |
| * broad rights to use your submissions as described in the Nmap Public * | |
| * Source License Contributor Agreement. This is important because we * | |
| * fund the project by selling licenses with various terms, and also * | |
| * because the inability to relicense code has caused devastating * | |
| * problems for other Free Software projects (such as KDE and NASM). * | |
| * * | |
| * The free version of Nmap 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. Warranties, * | |
| * indemnification and commercial support are all available through the * | |
| * Npcap OEM program--see https://nmap.org/oem. * | |
| * * | |
| ***************************************************************************/ | |
| /* $Id$ */ | |
| #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); | |
| } |