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nmap/nbase/nbase.h

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/***************************************************************************
* nbase.h -- The main include file exposing the external API for *
* libnbase, a library of base (often compatibility) routines. Programs *
* using libnbase can guarantee the availability of functions like *
* (v)snprintf and inet_pton. This library also provides consistency and *
* extended features for some functions. It was originally written for *
* use in the Nmap Security Scanner ( http://nmap.org ). *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
* *
* The Nmap Security Scanner is (C) 1996-2015 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 ("GPL"), BUT ONLY WITH ALL OF THE CLARIFICATIONS *
* AND EXCEPTIONS DESCRIBED HEREIN. 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@nmap.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 "derivative 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 with any software or content covered by this license *
* ("Covered Software"): *
* *
* o Integrates source code from Covered Software. *
* *
* o Reads or includes copyrighted data files, such as Nmap's nmap-os-db *
* or nmap-service-probes. *
* *
* o Is designed specifically to execute Covered Software and parse the *
* results (as opposed to typical shell or execution-menu apps, which will *
* execute anything you tell them to). *
* *
* o Includes Covered Software in a proprietary executable installer. The *
* installers produced by InstallShield are an example of this. Including *
* Nmap with other software in compressed or archival form does not *
* trigger this provision, provided appropriate open source decompression *
* or de-archiving software is widely available for no charge. For the *
* purposes of this license, an installer is considered to include Covered *
* Software even if it actually retrieves a copy of Covered Software from *
* another source during runtime (such as by downloading it from the *
* Internet). *
* *
* o Links (statically or dynamically) to a library which does any of the *
* above. *
* *
* o Executes a helper program, module, or script to do any of the above. *
* *
* This list is not exclusive, but is meant to clarify our interpretation *
* of derived works with some common examples. Other people may interpret *
* the plain GPL differently, so we consider this a special exception to *
* the GPL that we apply to Covered Software. Works which meet any of *
* these conditions must conform to all of the terms of this license, *
* particularly including the GPL Section 3 requirements of providing *
* source code and allowing free redistribution of the work as a whole. *
* *
* As another 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. *
* *
* Any redistribution of Covered Software, including any derived works, *
* must obey and carry forward all of the terms of this license, including *
* obeying all GPL rules and restrictions. For example, source code of *
* the whole work must be provided and free redistribution must be *
* allowed. All GPL references to "this License", are to be treated as *
* including the terms and conditions of this license text as well. *
* *
* Because this license imposes special exceptions to the GPL, Covered *
* Work may not be combined (even as part of a larger work) with plain GPL *
* software. The terms, conditions, and exceptions of this license must *
* be included as well. This license is incompatible with some other open *
* source licenses as well. In some cases we can relicense portions of *
* Nmap or grant special permissions to use it in other open source *
* software. Please contact fyodor@nmap.org with any such requests. *
* Similarly, we don't incorporate incompatible open source software into *
* Covered Software without special permission from the copyright holders. *
* *
* If you have any questions about the licensing restrictions on using *
* Nmap in other works, are 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@nmap.com for further *
* information. *
* *
* If you have received a written license agreement or contract for *
* Covered Software stating terms other than these, you may choose to use *
* and redistribute Covered Software under those terms instead of these. *
* *
* 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 send your changes *
* to the dev@nmap.org mailing list 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 Nmap *
* license file for more details (it's in a COPYING file included with *
* Nmap, and also available from https://svn.nmap.org/nmap/COPYING) *
* *
***************************************************************************/
/* $Id$ */
#ifndef NBASE_H
#define NBASE_H
/* NOTE -- libnbase offers the following features that you should probably
* be aware of:
*
* * 'inline' is defined to what is necessary for the C compiler being
* used (which may be nothing)
*
* * snprintf, inet_pton, memcpy, and bzero are
* provided if you don't have them (prototypes for these are
* included either way).
*
* * WORDS_BIGENDIAN is defined if platform is big endian
*
* * Definitions included which give the operating system type. They
* will generally be one of the following: LINUX, FREEBSD, NETBSD,
* OPENBSD, SOLARIS, SUNOS, BSDI, IRIX, NETBSD
*
* * Insures that getopt_* functions exist (such as getopt_long_only)
*
* * Various string functions such as Strncpy() and strcasestr() see protos
* for more info.
*
* * IPv6 structures like 'sockaddr_storage' are provided if they do
* not already exist.
*
* * Various Windows -> UNIX compatibility definitions are added (such as defining EMSGSIZE to WSAEMSGSIZE)
*/
#if HAVE_CONFIG_H
#include "nbase_config.h"
#else
#ifdef WIN32
#include "nbase_winconfig.h"
#endif /* WIN32 */
#endif /* HAVE_CONFIG_H */
#ifdef WIN32
#include "nbase_winunix.h"
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_NETDB_H
#include <netdb.h>
#endif
#if HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#include <stdio.h>
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
#ifndef MAXPATHLEN
#define MAXPATHLEN 2048
#endif
#ifndef HAVE___ATTRIBUTE__
#define __attribute__(args)
#endif
#include <stdarg.h>
/* Keep assert() defined for security reasons */
#undef NDEBUG
/* Integer types */
#include <stdint.h>
typedef uint8_t u8;
typedef int8_t s8;
typedef uint16_t u16;
typedef int16_t s16;
typedef uint32_t u32;
typedef int32_t s32;
typedef uint64_t u64;
typedef int64_t s64;
/* Mathematical MIN/MAX/ABS (absolute value) macros */
#ifndef MAX
#define MAX(x,y) (((x)>(y))?(x):(y))
#endif
#ifndef MIN
#define MIN(x,y) (((x)<(y))?(x):(y))
#endif
#ifndef ABS
#define ABS(x) (((x) >= 0)?(x):-(x))
#endif
/* Timeval subtraction in microseconds */
#define TIMEVAL_SUBTRACT(a,b) (((a).tv_sec - (b).tv_sec) * 1000000 + (a).tv_usec - (b).tv_usec)
/* Timeval subtract in milliseconds */
#define TIMEVAL_MSEC_SUBTRACT(a,b) ((((a).tv_sec - (b).tv_sec) * 1000) + ((a).tv_usec - (b).tv_usec) / 1000)
/* Timeval subtract in seconds; truncate towards zero */
#define TIMEVAL_SEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + (((a).tv_usec < (b).tv_usec) ? - 1 : 0))
/* Timeval subtract in fractional seconds; convert to float */
#define TIMEVAL_FSEC_SUBTRACT(a,b) ((a).tv_sec - (b).tv_sec + (((a).tv_usec - (b).tv_usec)/1000000.0))
/* assign one timeval to another timeval plus some msecs: a = b + msecs */
#define TIMEVAL_MSEC_ADD(a, b, msecs) { (a).tv_sec = (b).tv_sec + ((msecs) / 1000); (a).tv_usec = (b).tv_usec + ((msecs) % 1000) * 1000; (a).tv_sec += (a).tv_usec / 1000000; (a).tv_usec %= 1000000; }
#define TIMEVAL_ADD(a, b, usecs) { (a).tv_sec = (b).tv_sec + ((usecs) / 1000000); (a).tv_usec = (b).tv_usec + ((usecs) % 1000000); (a).tv_sec += (a).tv_usec / 1000000; (a).tv_usec %= 1000000; }
/* Find our if one timeval is before or after another, avoiding the integer
overflow that can result when doing a TIMEVAL_SUBTRACT on two widely spaced
timevals. */
#define TIMEVAL_BEFORE(a, b) (((a).tv_sec < (b).tv_sec) || ((a).tv_sec == (b).tv_sec && (a).tv_usec < (b).tv_usec))
#define TIMEVAL_AFTER(a, b) (((a).tv_sec > (b).tv_sec) || ((a).tv_sec == (b).tv_sec && (a).tv_usec > (b).tv_usec))
/* Convert a timeval to floating point seconds */
#define TIMEVAL_SECS(a) ((double) (a).tv_sec + (double) (a).tv_usec / 1000000)
/* sprintf family */
#if !defined(HAVE_SNPRINTF) && defined(__cplusplus)
extern "C" int snprintf (char *str, size_t sz, const char *format, ...)
__attribute__ ((format (printf, 3, 4)));
#endif
#if !defined(HAVE_VSNPRINTF) && defined(__cplusplus)
extern "C" int vsnprintf (char *str, size_t sz, const char *format,
va_list ap)
__attribute__((format (printf, 3, 0)));
#endif
#if !defined(HAVE_ASPRINTF) && defined(__cplusplus)
extern "C" int asprintf (char **ret, const char *format, ...)
__attribute__ ((format (printf, 2, 3)));
#endif
#if !defined(HAVE_VASPRINTF) && defined(__cplusplus)
extern "C" int vasprintf (char **ret, const char *format, va_list ap)
__attribute__((format (printf, 2, 0)));
#endif
#if !defined(HAVE_ASNPRINTF) && defined(__cplusplus)
extern "C" int asnprintf (char **ret, size_t max_sz, const char *format, ...)
__attribute__ ((format (printf, 3, 4)));
#endif
#if !defined(HAVE_VASNPRINTF) && defined(__cplusplus)
extern "C" int vasnprintf (char **ret, size_t max_sz, const char *format,
va_list ap)
__attribute__((format (printf, 3, 0)));
#endif
#if defined(NEED_SNPRINTF_PROTO) && defined(__cplusplus)
extern "C" int snprintf (char *, size_t, const char *, ...);
#endif
#if defined(NEED_VSNPRINTF_PROTO) && defined(__cplusplus)
extern "C" int vsnprintf (char *, size_t, const char *, va_list);
#endif
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#else
#ifndef HAVE_GETOPT_LONG_ONLY
#include "getopt.h"
#endif
#endif /* HAVE_GETOPT_H */
/* More Windows-specific stuff */
#ifdef WIN32
#define WIN32_LEAN_AND_MEAN /* Whatever this means! From winclude.h*/
/* Apparently Windows doesn't have S_ISDIR */
#ifndef S_ISDIR
#define S_ISDIR(m) (((m) & _S_IFMT) == _S_IFDIR)
#endif
/* Windows doesn't have the access() defines */
#ifndef F_OK
#define F_OK 00
#endif
#ifndef W_OK
#define W_OK 02
#endif
#ifndef R_OK
#define R_OK 04
#endif
/* wtf was ms thinking? */
#define access _access
#define stat _stat
#define execve _execve
#define getpid _getpid
#define dup _dup
#define dup2 _dup2
#define strdup _strdup
#define write _write
#define open _open
#define stricmp _stricmp
#define putenv _putenv
#if !defined(__GNUC__)
#define snprintf _snprintf
#endif
#define strcasecmp _stricmp
#define strncasecmp _strnicmp
#define execv _execv
#endif /* WIN32 */
/* Apparently Windows doesn't like /dev/null */
#ifdef WIN32
#define DEVNULL "NUL"
#else
#define DEVNULL "/dev/null"
#endif
#if defined(_MSC_VER) && !defined(__cplusplus) && !defined(inline)
#define inline __inline
#endif
#if defined(__GNUC__)
#define NORETURN __attribute__((noreturn))
#elif defined(_MSC_VER)
#define NORETURN __declspec(noreturn)
#else
#define NORETURN
#endif
static inline int checked_fd_isset(int fd, fd_set *fds) {
#ifndef WIN32
if (fd >= FD_SETSIZE) {
fprintf(stderr, "Attempt to FD_ISSET fd %d, which is not less than "
"FD_SETSIZE (%d). Try using a lower parallelism.",
fd, FD_SETSIZE);
abort();
}
#endif
return FD_ISSET(fd, fds);
}
static inline void checked_fd_clr(int fd, fd_set *fds) {
#ifndef WIN32
if (fd >= FD_SETSIZE) {
fprintf(stderr, "Attempt to FD_CLR fd %d, which is not less than "
"FD_SETSIZE (%d). Try using a lower parallelism.",
fd, FD_SETSIZE);
abort();
}
#endif
FD_CLR(fd, fds);
}
static inline void checked_fd_set(int fd, fd_set *fds) {
#ifndef WIN32
if (fd >= FD_SETSIZE) {
fprintf(stderr, "Attempt to FD_SET fd %d, which is not less than "
"FD_SETSIZE (%d). Try using a lower parallelism.",
fd, FD_SETSIZE);
abort();
}
#endif
FD_SET(fd, fds);
}
#ifdef __cplusplus
extern "C" {
#endif
/* Returns the UNIX/Windows errno-equivalent. Note that the Windows
call is socket/networking specific. Also, WINDOWS TENDS TO RESET
THE ERROR, so it will return success the next time. So SAVE THE
RESULTS and re-use them, don't keep calling socket_errno(). The
windows error number returned is like WSAMSGSIZE, but nbase.h
includes #defines to correlate many of the common UNIX errors
with their closest Windows equivalents. So you can use EMSGSIZE
or EINTR. */
int socket_errno();
/* We can't just use strerror to get socket errors on Windows because it has
its own set of error codes: WSACONNRESET not ECONNRESET for example. This
function will do the right thing on Windows. Call it like
socket_strerror(socket_errno())
*/
char *socket_strerror(int errnum);
/* The usleep() function is important as well */
#ifndef HAVE_USLEEP
#if defined( HAVE_NANOSLEEP) || defined(WIN32)
void usleep(unsigned long usec);
#endif
#endif
/***************** String functions -- See nbase_str.c ******************/
/* I modified this conditional because !@# Redhat does not easily provide
the prototype even though the function exists */
#if !defined(HAVE_STRCASESTR) || (defined(LINUX) && !defined(__USE_GNU) && !defined(_GNU_SOURCE))
/* strcasestr is like strstr() except case insensitive */
char *strcasestr(const char *haystack, const char *pneedle);
#endif
#ifndef HAVE_STRCASECMP
int strcasecmp(const char *s1, const char *s2);
#endif
#ifndef HAVE_STRNCASECMP
int strncasecmp(const char *s1, const char *s2, size_t n);
#endif
#ifndef HAVE_GETTIMEOFDAY
int gettimeofday(struct timeval *tv, struct timeval *tz);
#endif
#ifndef HAVE_SLEEP
unsigned int sleep(unsigned int seconds);
#endif
/* Strncpy is like strcpy() except it ALWAYS zero-terminates, even if
it must truncate */
int Strncpy(char *dest, const char *src, size_t n);
int Vsnprintf(char *, size_t, const char *, va_list)
__attribute__ ((format (printf, 3, 0)));
int Snprintf(char *, size_t, const char *, ...)
__attribute__ ((format (printf, 3, 4)));
char *mkstr(const char *start, const char *end);
int alloc_vsprintf(char **strp, const char *fmt, va_list va)
__attribute__ ((format (printf, 2, 0)));
char *escape_windows_command_arg(const char *arg);
/* parse_long is like strtol or atoi, but it allows digits only.
No whitespace, sign, or radix prefix. */
long parse_long(const char *s, char **tail);
/* This function takes a byte count and stores a short ascii equivalent
in the supplied buffer. Eg: 0.122MB, 10.322Kb or 128B. */
char *format_bytecount(unsigned long long bytes, char *buf, size_t buflen);
/* 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 equivalent (for example, - and _ are
considered to be the same), nonzero otherwise. */
int optcmp(const char *a, const char *b);
/* Convert non-printable characters to replchar in the string */
void replacenonprintable(char *str, int strlength, char replchar);
/* Returns one if the file pathname given exists, is not a directory and
* is readable by the executing process. Returns two if it is readable
* and is a directory. Otherwise returns 0. */
int file_is_readable(const char *pathname);
/* Portable, incompatible replacements for dirname and basename. */
char *path_get_dirname(const char *path);
char *path_get_basename(const char *path);
/* A few simple wrappers for the most common memory allocation routines which will exit() if the
allocation fails, so you don't always have to check -- see nbase_memalloc.c */
void *safe_malloc(size_t size);
void *safe_realloc(void *ptr, size_t size);
/* Zero-initializing version of safe_malloc */
void *safe_zalloc(size_t size);
/* Some routines for obtaining simple (not secure on systems that
lack /dev/random and friends' "random" numbers */
int get_random_bytes(void *buf, int numbytes);
int get_random_int();
unsigned short get_random_ushort();
unsigned int get_random_uint();
u64 get_random_u64();
u32 get_random_u32();
u16 get_random_u16();
u8 get_random_u8();
u32 get_random_unique_u32();
/* Create a new socket inheritable by subprocesses. On non-Windows systems it's
just a normal socket. */
int inheritable_socket(int af, int style, int protocol);
/* The dup function on Windows works only on file descriptors, not socket
handles. This function accomplishes the same thing for sockets. */
int dup_socket(int sd);
int unblock_socket(int sd);
int block_socket(int sd);
int socket_bindtodevice(int sd, const char *device);
/* CRC32 Cyclic Redundancy Check */
unsigned long nbase_crc32(unsigned char *buf, int len);
/* CRC32C Cyclic Redundancy Check (Castagnoli) */
unsigned long nbase_crc32c(unsigned char *buf, int len);
/* Adler32 Checksum */
unsigned long nbase_adler32(unsigned char *buf, int len);
double tval2secs(const char *tspec);
long tval2msecs(const char *tspec);
const char *tval_unit(const char *tspec);
int fselect(int s, fd_set *rmaster, fd_set *wmaster, fd_set *emaster, struct timeval *tv);
char *hexdump(const u8 *cp, u32 length);
char *executable_path(const char *argv0);
/* addrset management functions and definitions */
/* A set of addresses. Used to match against allow/deny lists. */
struct addrset_elem;
/* A set of addresses. Used to match against allow/deny lists. */
struct addrset {
/* Linked list of struct addset_elem. */
struct addrset_elem *head;
};
void nbase_set_log(void (*log_user_func)(const char *, ...),void (*log_debug_func)(const char *, ...));
extern void addrset_init(struct addrset *set);
extern void addrset_free(struct addrset *set);
extern void addrset_elem_print(FILE *fp, const struct addrset_elem *elem);
extern int addrset_add_spec(struct addrset *set, const char *spec, int af, int dns);
extern int addrset_add_file(struct addrset *set, FILE *fd, int af, int dns);
extern int addrset_contains(const struct addrset *set, const struct sockaddr *sa);
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
#ifndef STDOUT_FILENO
#define STDOUT_FILENO 1
#endif
#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif
#include "nbase_ipv6.h"
#ifdef __cplusplus
}
#endif
#endif /* NBASE_H */
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