/*************************************************************************** * utils.cc -- Various miscellaneous utility functions which defy * * categorization :) * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2009 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-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. 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 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 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, it is assumed 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. * * * ***************************************************************************/ #include "utils.h" #include "Service.h" /* * Case insensitive memory search - a combination of memmem and strcasestr * Will search for a particular string 'pneedle' in the first 'bytes' of * memory starting at 'haystack' */ char * memsearch(const char *haystack, const char *pneedle, size_t bytes) { char buf[512]; unsigned int needlelen; const char *p; char *needle, *q, *foundto; size_t i; /* 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(*p++))) ; p = haystack - 1; foundto = needle; i = 0; while(i < bytes) { ++p; if(tolower(*p) == *foundto) { if(!*++foundto) { /* Yeah, we found it */ if (needlelen >= sizeof(buf)) free(needle); return (char *) (p - needlelen + 1); } } else foundto = needle; i++; } if (needlelen >= sizeof(buf)) free(needle); return NULL; } /* strtoul with error checking */ unsigned long int Strtoul(const char *nptr) { unsigned long value; char *endp = NULL; value = strtoul(nptr, &endp, 0); if (errno != 0 || *endp != '\0') fatal("Invalid value for number: %s", nptr); return value; } /* * Return a copy of 'size' characters from 'src' string. * Will always null terminate by allocating 1 additional char. */ char * Strndup(const char *src, size_t size) { char *ret; ret = (char *)safe_malloc(size + 1); strncpy(ret, src, size); ret[size] = '\0'; return ret; } /* * Convert string to port (in host-byte order) */ u16 str2port(char *exp) { unsigned long pvalue; char *endp = NULL; errno = 0; pvalue = strtoul(exp, &endp, 0); if (errno != 0 || *endp != '\0') fatal("Invalid port number: %s", exp); if (pvalue > 65535) fatal("Port number too large: %s", exp); return (u16)pvalue; } /* Compare a canonical option name (e.g. "max-scan-delay") with a user-generated option such as "max_scan_delay" and returns 0 if the two values are considered equivalant (for example, - and _ are considered to be the same), nonzero otherwise. */ int optcmp(const char *a, const char *b) { while(*a && *b) { if (*a == '_' || *a == '-') { if (*b != '_' && *b != '-') return 1; } else if (*a != *b) return 1; a++; b++; } if (*a || *b) return 1; return 0; } /* convert string to protocol number */ u8 str2proto(char *str) { if (!strcasecmp(str, "tcp")) return IPPROTO_TCP; else if (!strcasecmp(str, "udp")) return IPPROTO_UDP; else return 0; } /* convert protocol number to string */ char * proto2str(u8 proto) { if (proto == IPPROTO_TCP) return "tcp"; else if (proto == IPPROTO_UDP) return "udp"; else return NULL; }