/*************************************************************************** * nbase_str.c -- string related functings in the nbase library. These * * were written by fyodor@insecure.org . * * * ***********************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. * * * ***************************************************************************/ /* $Id$ */ #include "nbase.h" #include #include #include #ifndef HAVE_STRCASESTR char *strcasestr(const char *haystack, const char *pneedle) { char buf[512]; unsigned int needlelen; const char *p; char *needle, *q, *foundto; /* Should crash if !pneedle -- this is OK */ if (!*pneedle) return (char *) haystack; if (!haystack) return NULL; needlelen = (unsigned int) strlen(pneedle); if (needlelen >= sizeof(buf)) { needle = (char *) safe_malloc(needlelen + 1); } else needle = buf; p = pneedle; q = needle; while((*q++ = tolower((int) (unsigned char) *p++))) ; p = haystack - 1; foundto = needle; while(*++p) { if(tolower((int) (unsigned char) *p) == *foundto) { if(!*++foundto) { /* Yeah, we found it */ if (needlelen >= sizeof(buf)) free(needle); return (char *) (p - needlelen + 1); } } else foundto = needle; } if (needlelen >= sizeof(buf)) free(needle); return NULL; } #endif int Strncpy(char *dest, const char *src, size_t n) { strncpy(dest, src, n); if (dest[n-1] == '\0') return 0; dest[n-1] = '\0'; return -1; } int Vsnprintf(char *s, size_t n, const char *fmt, va_list ap) { int ret; ret = vsnprintf(s, n, fmt, ap); if (ret < 0 || (unsigned) ret >= n) s[n - 1] = '\0'; return ret; } int Snprintf(char *s, size_t n, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = Vsnprintf(s, n, fmt, ap); va_end(ap); return ret; } /* vsprintf into a dynamically allocated buffer, similar to asprintf in Glibc. Return the length of the buffer or -1 on error. */ int alloc_vsprintf(char **strp, const char *fmt, va_list va) { va_list va_tmp; char *s; int size = 32; int n; s = NULL; size = 32; for (;;) { s = (char *) safe_realloc(s, size); #ifdef WIN32 va_tmp = va; #else va_copy(va_tmp, va); #endif n = vsnprintf(s, size, fmt, va_tmp); if (n >= size) size = n + 1; else if (n < 0) size = size * 2; else break; } *strp = s; return n; } /* Trivial function that returns nonzero if all characters in str of length strlength are printable (as defined by isprint()) */ int stringisprintable(const char *str, int strlength) { int i; for(i=0; i < strlength; i++) if (!isprint((int) (unsigned char) str[i])) return 0; return 1; } /* Convert non-printable characters to replchar in the string */ void replacenonprintable(char *str, int strlength, char replchar) { int i; for(i=0; i < strlength; i++) if (!isprint((int) (unsigned char) str[i])) str[i] = replchar; return; } /* Returns the position of the last directory separator (slash, also backslash on Win32) in a path. Returns -1 if none was found. */ static int find_last_path_separator(const char *path) { #ifndef WIN32 const char *PATH_SEPARATORS = "/"; #else const char *PATH_SEPARATORS = "\\/"; #endif const char *p; p = path + strlen(path) - 1; while (p >= path) { if (strchr(PATH_SEPARATORS, *p) != NULL) return (int)(p - path); p--; } return -1; } /* Returns the directory name part of a path (everything up to the last directory separator). If there is no separator, returns ".". If there is only one separator and it is the first character, returns "/". Returns NULL on error. The returned string must be freed. */ char *path_get_dirname(const char *path) { char *result; int i; i = find_last_path_separator(path); if (i == -1) return strdup("."); if (i == 0) return strdup("/"); result = (char *) safe_malloc(i + 1); strncpy(result, path, i); result[i] = '\0'; return result; } /* Returns the file name part of a path (everything after the last directory separator). Returns NULL on error. The returned string must be freed. */ char *path_get_basename(const char *path) { int i; i = find_last_path_separator(path); return strdup(path + i + 1); }