This spec can be used to parse utmp, wtmp and other similar as created by IBM AIX.
This page hosts a formal specification of utmp log file, IBM AIX version using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for C++98/STL generated by Kaitai Struct depends on the C++/STL runtime library. You have to install it before you can parse data.
For C++, the easiest way is to clone the runtime library sources and build them along with your project.
Using Kaitai Struct in C++/STL usually consists of 3 steps.
std::istream). One can open local file for that, or use existing std::string or char* buffer.
#include <fstream>
std::ifstream is("path/to/local/file.bin", std::ifstream::binary);
#include <sstream>
std::istringstream is(str);
#include <sstream>
const char buf[] = { ... };
std::string str(buf, sizeof buf);
std::istringstream is(str);
#include "kaitai/kaitaistream.h"
kaitai::kstream ks(&is);
aix_utmp_t data(&ks);
After that, one can get various attributes from the structure by invoking getter methods like:
data.records() // => get records
#ifndef AIX_UTMP_H_
#define AIX_UTMP_H_
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
#include "kaitai/kaitaistruct.h"
#include <stdint.h>
#include <vector>
#if KAITAI_STRUCT_VERSION < 9000L
#error "Incompatible Kaitai Struct C++/STL API: version 0.9 or later is required"
#endif
/**
* This spec can be used to parse utmp, wtmp and other similar as created by IBM AIX.
* \sa https://www.ibm.com/docs/en/aix/7.1?topic=files-utmph-file Source
*/
class aix_utmp_t : public kaitai::kstruct {
public:
class record_t;
class exit_status_t;
enum entry_type_t {
ENTRY_TYPE_EMPTY = 0,
ENTRY_TYPE_RUN_LVL = 1,
ENTRY_TYPE_BOOT_TIME = 2,
ENTRY_TYPE_OLD_TIME = 3,
ENTRY_TYPE_NEW_TIME = 4,
ENTRY_TYPE_INIT_PROCESS = 5,
ENTRY_TYPE_LOGIN_PROCESS = 6,
ENTRY_TYPE_USER_PROCESS = 7,
ENTRY_TYPE_DEAD_PROCESS = 8,
ENTRY_TYPE_ACCOUNTING = 9
};
aix_utmp_t(kaitai::kstream* p__io, kaitai::kstruct* p__parent = 0, aix_utmp_t* p__root = 0);
private:
void _read();
void _clean_up();
public:
~aix_utmp_t();
class record_t : public kaitai::kstruct {
public:
record_t(kaitai::kstream* p__io, aix_utmp_t* p__parent = 0, aix_utmp_t* p__root = 0);
private:
void _read();
void _clean_up();
public:
~record_t();
private:
std::string m_user;
std::string m_inittab_id;
std::string m_device;
uint64_t m_pid;
entry_type_t m_type;
int64_t m_timestamp;
exit_status_t* m_exit_status;
std::string m_hostname;
int32_t m_dbl_word_pad;
std::string m_reserved_a;
std::string m_reserved_v;
aix_utmp_t* m__root;
aix_utmp_t* m__parent;
public:
/**
* User login name
*/
std::string user() const { return m_user; }
/**
* /etc/inittab id
*/
std::string inittab_id() const { return m_inittab_id; }
/**
* device name (console, lnxx)
*/
std::string device() const { return m_device; }
/**
* process id
*/
uint64_t pid() const { return m_pid; }
/**
* Type of login
*/
entry_type_t type() const { return m_type; }
/**
* time entry was made
*/
int64_t timestamp() const { return m_timestamp; }
/**
* the exit status of a process marked as DEAD PROCESS
*/
exit_status_t* exit_status() const { return m_exit_status; }
/**
* host name
*/
std::string hostname() const { return m_hostname; }
int32_t dbl_word_pad() const { return m_dbl_word_pad; }
std::string reserved_a() const { return m_reserved_a; }
std::string reserved_v() const { return m_reserved_v; }
aix_utmp_t* _root() const { return m__root; }
aix_utmp_t* _parent() const { return m__parent; }
};
class exit_status_t : public kaitai::kstruct {
public:
exit_status_t(kaitai::kstream* p__io, aix_utmp_t::record_t* p__parent = 0, aix_utmp_t* p__root = 0);
private:
void _read();
void _clean_up();
public:
~exit_status_t();
private:
int16_t m_termination_code;
int16_t m_exit_code;
aix_utmp_t* m__root;
aix_utmp_t::record_t* m__parent;
public:
/**
* process termination status
*/
int16_t termination_code() const { return m_termination_code; }
/**
* process exit status
*/
int16_t exit_code() const { return m_exit_code; }
aix_utmp_t* _root() const { return m__root; }
aix_utmp_t::record_t* _parent() const { return m__parent; }
};
private:
std::vector<record_t*>* m_records;
aix_utmp_t* m__root;
kaitai::kstruct* m__parent;
public:
std::vector<record_t*>* records() const { return m_records; }
aix_utmp_t* _root() const { return m__root; }
kaitai::kstruct* _parent() const { return m__parent; }
};
#endif // AIX_UTMP_H_
// This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
#include "aix_utmp.h"
aix_utmp_t::aix_utmp_t(kaitai::kstream* p__io, kaitai::kstruct* p__parent, aix_utmp_t* p__root) : kaitai::kstruct(p__io) {
m__parent = p__parent;
m__root = this;
m_records = 0;
try {
_read();
} catch(...) {
_clean_up();
throw;
}
}
void aix_utmp_t::_read() {
m_records = new std::vector<record_t*>();
{
int i = 0;
while (!m__io->is_eof()) {
m_records->push_back(new record_t(m__io, this, m__root));
i++;
}
}
}
aix_utmp_t::~aix_utmp_t() {
_clean_up();
}
void aix_utmp_t::_clean_up() {
if (m_records) {
for (std::vector<record_t*>::iterator it = m_records->begin(); it != m_records->end(); ++it) {
delete *it;
}
delete m_records; m_records = 0;
}
}
aix_utmp_t::record_t::record_t(kaitai::kstream* p__io, aix_utmp_t* p__parent, aix_utmp_t* p__root) : kaitai::kstruct(p__io) {
m__parent = p__parent;
m__root = p__root;
m_exit_status = 0;
try {
_read();
} catch(...) {
_clean_up();
throw;
}
}
void aix_utmp_t::record_t::_read() {
m_user = kaitai::kstream::bytes_to_str(m__io->read_bytes(256), std::string("ascii"));
m_inittab_id = kaitai::kstream::bytes_to_str(m__io->read_bytes(14), std::string("ascii"));
m_device = kaitai::kstream::bytes_to_str(m__io->read_bytes(64), std::string("ascii"));
m_pid = m__io->read_u8be();
m_type = static_cast<aix_utmp_t::entry_type_t>(m__io->read_s2be());
m_timestamp = m__io->read_s8be();
m_exit_status = new exit_status_t(m__io, this, m__root);
m_hostname = kaitai::kstream::bytes_to_str(m__io->read_bytes(256), std::string("ascii"));
m_dbl_word_pad = m__io->read_s4be();
m_reserved_a = m__io->read_bytes(8);
m_reserved_v = m__io->read_bytes(24);
}
aix_utmp_t::record_t::~record_t() {
_clean_up();
}
void aix_utmp_t::record_t::_clean_up() {
if (m_exit_status) {
delete m_exit_status; m_exit_status = 0;
}
}
aix_utmp_t::exit_status_t::exit_status_t(kaitai::kstream* p__io, aix_utmp_t::record_t* p__parent, aix_utmp_t* p__root) : kaitai::kstruct(p__io) {
m__parent = p__parent;
m__root = p__root;
try {
_read();
} catch(...) {
_clean_up();
throw;
}
}
void aix_utmp_t::exit_status_t::_read() {
m_termination_code = m__io->read_s2be();
m_exit_code = m__io->read_s2be();
}
aix_utmp_t::exit_status_t::~exit_status_t() {
_clean_up();
}
void aix_utmp_t::exit_status_t::_clean_up() {
}