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Diffstat (limited to 'libnetutil/RawData.cc')
| -rw-r--r-- | libnetutil/RawData.cc | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/libnetutil/RawData.cc b/libnetutil/RawData.cc new file mode 100644 index 0000000..92500c5 --- /dev/null +++ b/libnetutil/RawData.cc @@ -0,0 +1,172 @@ +/*************************************************************************** + * RawData.cc -- The RawData Class represents a network packet payload. It * + * is essentially a single buffer that may contain either random data or * + * caller supplied data. This class can be used, for example, to be linked * + * to a UDP datagram. * + * * + ***********************IMPORTANT NMAP LICENSE TERMS************************ + * + * The Nmap Security Scanner is (C) 1996-2023 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.com) 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 dev@nmap.org 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/ + * + ***************************************************************************/ +/* This code was originally part of the Nping tool. */ + +#include "RawData.h" + +/******************************************************************************/ +/* CONTRUCTORS, DESTRUCTORS AND INITIALIZATION METHODS */ +/******************************************************************************/ +RawData::RawData(){ + this->reset(); +} /* End of RawData contructor */ + + +RawData::~RawData(){ + if(this->data!=NULL){ + free(this->data); + this->data=NULL; + } +} /* End of RawData destructor */ + + +/** Sets every attribute to its default value */ +void RawData::reset(){ + this->data=NULL; + this->length=0; +} /* End of reset() */ + + +/******************************************************************************/ +/* PacketElement:: OVERWRITTEN METHODS */ +/******************************************************************************/ + +u8 * RawData::getBufferPointer(){ + return this->getBufferPointer(NULL); +} /* End of getBufferPointer() */ + + +u8 * RawData::getBufferPointer(int *mylen){ + if(mylen!=NULL) + *mylen=this->length; + return this->data; +} /* End of getBufferPointer() */ + + +/** Added for consistency with the rest of classes of the PacketElement family. */ +int RawData::storeRecvData(const u8 *buf, size_t len){ + return this->store(buf, len); +} /* End of storeRecvData() */ + + +/* Returns a protocol identifier. This is used by packet parsing funtions + * that return linked lists of PacketElement objects, to determine the protocol + * the object represents. */ +int RawData::protocol_id() const { + return HEADER_TYPE_RAW_DATA; +} /* End of protocol_id() */ + + +/** Determines if the data stored in the object after an storeRecvData() call + * is valid and safe to use. This mainly checks the length of the data but may + * also test the value of certain protocol fields to ensure their correctness. + * @return the length, in bytes, of the header, if its found to be valid or + * OP_FAILURE (-1) otherwise. */ +int RawData::validate(){ + return this->length; +} /* End of validate() */ + + +/** Prints the contents of the header and calls print() on the next protocol + * header in the chain (if there is any). + * @return OP_SUCCESS on success and OP_FAILURE in case of error. */ +int RawData::print(FILE *output, int detail) const { + fprintf(output, "Payload["); + fprintf(output, "%d byte%s]", this->length, (this->length!=1)? "s":""); + if(this->next!=NULL){ + print_separator(output, detail); + next->print(output, detail); + } + return OP_SUCCESS; +} /* End of print() */ + + +/******************************************************************************/ +/* PROTOCOL-SPECIFIC METHODS */ +/******************************************************************************/ + +int RawData::store(const u8 *buf, size_t len){ + /* If buffer had already been set, try to reuse it. */ + if(this->data!=NULL){ + if( this->length >= (int)len ){ + memcpy(this->data, buf, len); + this->length=(int)len; + return OP_SUCCESS; + }else{ + free(this->data); + } + } + if( (this->data=(u8 *)calloc(len, sizeof(u8)))==NULL ) + return OP_FAILURE; + memcpy(this->data, buf, len); + this->length=(int)len; + return OP_SUCCESS; +} /* End of store() */ + + +int RawData::store(const char *str){ + if(str==NULL) + return OP_FAILURE; + else + return this->store((const u8*)str, strlen(str)); +} /* End of store() */ + + |