http://www.hackerschool.org/HS_Boards/zboard.php?id=Free_Lectures&no=636 [º¹»ç]
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Netcat(°£´ÜÇÏ°Ô nc¶ó°íµµ ÇÔ)Àº http://www.l0pht.com/users/10pht/nc110.tgz ¿¡¼ ±¸ÇÒ ¼ö ÀÖ½À´Ï´Ù.
NetcatÀº TCP³ª UDP ³×Æ®¿öÅ© ¿¬°áÀ» ÅëÇؼ µ¥ÀÌÅ͸¦ Àаųª ¾µ ¼ö ÀÖµµ·Ï ¸¸µç ÇÁ·Î±×·¥ÀÔ´Ï´Ù.
Ưº°ÇÏ°Ô ½© ½ºÅ©¸³Æ®³ª ´Ù¸¥ ÇÁ·Î±×·¥¿¡¼ »ç¿ëÇϵµ·Ï ¸¸µç "Back-end" ÅøÀÔ´Ï´Ù.
±×¿Í µ¿½Ã¿¡ ¾à°£ÀÇ Àç¹ÌÀÖ´Â ¿©·¯°¡Áö ¿¬°á·Î ³×Æ®¿öÅ©¸¦ µð¹ö±ëÇÏ°í Á¶»çÇÒ ¼ö ÀÖ°Ô ¸¸µç ÅøÀÔ´Ï´Ù.
NetcatÀº ½ÇÁ¦·Î nc¶ó´Â ÇÁ·Î±×·¥À̸§À» °¡Áö°í ÀÖ½À´Ï´Ù.
¿¹ÀüºÎÅÍ ½Åºñ·ÓÁö¸¸ Ç¥ÁØÀûÀÎ À¯´Ð½º Åø·Î Á¦°øµÇ¾ú½À´Ï´Ù. ( ±×·±°¡ -_-;;)
°£´ÜÇÑ »ç¿ë¹ýÀ¸·Î "nc host port" Çϸé ÁÖ¾îÁø È£½ºÆ®ÀÇ Æ¯Á¤ Æ÷Æ®·Î TCP ¿¬°áÀ» ÇÕ´Ï´Ù. ±×¸®°í
¿©·¯ºÐÀÇ Ç¥ÁØ ÀÔ·ÂÀ» ±× ÂÊÀ¸·Î º¸³À´Ï´Ù. ±×¸®°í Ç¥ÁØ Ãâ·ÂÀ» ¿¬°áÀ» ÅëÇؼ
ÀÌÂÊ¿¡ º¸¿©ÁÝ´Ï´Ù. ÀÌ°Ç ÇÑÂÊ ³×Æ®¿öÅ©°¡ ´Ù¿î µÉ¶§±îÁö °è¼ÓÇÒ ¼ö ÀÖ½À´Ï´Ù. end-of-fileÀ»
ÀÔ·ÂÇϸé Á¾·áµÇ´Â ´Ù¸¥ ÇÁ·Î±×·¥°ú ´Ù¸£°Ô °è¼Ó ÀÛµ¿ÇÕ´Ï´Ù.
¶ÇÇÑ NetCatÀº ¼¹ö·Î »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù. ÁöÁ¤ÇÑ Æ÷Æ®·Î µé¾î¿À´Â ¿¬°áÀ» ±â´Ù¸®µµ·Ï »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù.
±×¸®°í UDP¸¦ ÅëÇؼµµ ÀÌ·¸°Ô ÇÒ ¼ö ÀÖ½À´Ï´Ù. TCP º¸´Ù ´ú ½Å·ÚµÇ°í ¾î¶²
½Ã½ºÅÛ¿¡¼´Â ¸¹Àº µ¥ÀÌÅ͸¦ º¸³¾ ¼ö ¾øÁö¸¸ À¯¿ëÇÒ ¶§°¡ ÀÖ½À´Ï´Ù.
NetCatÀÌ ÇÒ ¼ö ÀÖ´Â ´ëÇ¥ÀûÀÎ ÀϷδÂ
Outbound or inbound connections, TCP or UDP, to or from any ports
Full DNS forward/reverse checking, with appropriate warnings
Ability to use any local source port
Ability to use any locally-configured network source address
Built-in port-scanning capabilities, with randomizer
Built-in loose source-routing capability
Can read command line arguments from standard input
Slow-send mode, one line every N seconds
Hex dump of transmitted and received data
Optional ability to let another program service established connections
Optional telnet-options responder
ÀÌ°ÍÀÌ ÀÖ½À´Ï´Ù. (ÀÌ°Ç ¿©·¯ºÐ °¢ÀÚ°¡ ¹ø¿ªÇØ º¸¼¼¿ä.)
¸¸µå´Â ¹ý
http://www.l0pht.com/users/10pht/nc110.tgz ¿¡¼ ±¸ÇÒ ¼ö ÀÖ½À´Ï´Ù.
¾ÐÃàÀ» Ç®°í
Ưº°ÇÏ°Ô ¼³Á¤ÇÒ °Ç ¾ø°í
Makefile¿¡¼ -DGAPING_SECURITY_HOLE ÀÌ ºÎºÐÀ» Ãß°¡ ½ÃÄÑÁÖ´Â°Ô Áß¿äÇÕ´Ï´Ù.
ÀÌ°Ô ¾øÀ¸¸é À¯¿ëÇÑ -e ¿É¼ÇÀ» ¾²Áö ¸øÇÕ´Ï´Ù.
### HARD TARGETS
nc: netcat.c
$(LD) $(DFLAGS) $(XFLAGS) $(STATIC) -DGAPING_SECURITY_HOLE -o nc netcat.c $(XLIBS)
°íÄ£´ÙÀ½ make linux ÇÏ¸é µË´Ï´Ù.
ÀÚ »ç¿ëÇØ º¸±â Àü¿¡ µµ¿ò¸»À» º¾½Ã´Ù.
$ ./nc -h
[v1.10]
¾î´À °÷¿¡ Á¢¼ÓÇÒ¶§: nc [-¿É¼Ç] hostname port[s] [ports] ...
Á¢¼ÓÀ» ±â´Ù¸±¶§: nc -l -p port [-options] [hostname] [port]
options:
-e prog ÇÁ·Î±×·¥ Á¢¼ÓÈÄ ÇÁ·Î±×·¥À» ½ÇÇàÇÑ´Ù. [ À§Çè ]
-g gateway source-routing hop point[s], up to 8
-G num source-routing pointer: 4, 8, 12, ...
-h µµ¿ò¸»
-i secs ¶óÀÎÀ» º¸³¾ ¶§ ¸¶´Ù secs ¸¸Å ½®´Ù. ½ºÄµÇÒ¶§ »ç¿ë
-l listen ¸ðµå , µé¾î¿À´Â ÆÐŶ¿¡ ¹ÝÀÀÇÑ´Ù.
-n DNS¸¦ ÀÌ¿ëÇÏÁö ¾Ê°í IP ÁÖ¼Ò¸¦ »ç¿ëÇÑ´Ù.
-o file ³»¿ëÀ» file¿¡ ±â·ÏÇÑ´Ù.
-p port ·ÎÄà Æ÷Æ® ¹øÈ£
-r ÄÄÇ»ÅÍ°¡ ¸¶À½´ë·Î Æ÷Æ®¸¦ ÁöÁ¤ÇÑ´Ù.
-s addr local source address
-u UDP ¸ðµå
-v Ãâ·ÂÀ» ÀÚ¼¼ÇÏ°Ô ÇÑ´Ù.
-w secs ¸¶Áö¸·À¸·Î ÀÐÀº ´ÙÀ½ secs ÈÄ¿¡ Á¾·áÇÑ´Ù.
-z ¾Æ¹« µ¥ÀÌÅ͵µ ¾È º¸³½´Ù. scan ¶§ »ç¿ë
Æ÷Æ®´Â ÇϳªÇϳª ÁöÁ¤Çϰųª ¹üÀ§¸¦ ¾µ ¼ö ÀÖ½À´Ï´Ù. ³·Àº Æ÷Æ®-³ôÀº Æ÷Æ®
ÀÌ ¹®¼¸¦ ¾²½Ç ¶§ Ãâó(http://security.xmecca.com)¸¦ ²À Àû¾î Áֽøé
¾î´À °÷À̳ª ¾²½Ç ¼ö ÀÖ½À´Ï´Ù.
BBS¿¡ ±Û±îÁö ³²°ÜÁÖ½Ã¸é ´õ¿í °í¸¿°Ú½À´Ï´Ù.
Netcat ReadMe¸¦ ºÎºÐºÎºÐ ¹ø¿ªÇß½À´Ï´Ù.
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Hit : 11272 Date : 2007/02/22 04:00
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