Netcat C++

Well, that's a good point. The last two exams I took in college focused on that very thing. One, we were given nothing but a manual then asked a bunch of questions; the next, we were given machines that had various things wrong with them, and we had to figure out by ourselves why they weren't working. So I see your point, those who don't figure part if out on their own never truly master it; they just repeat what's told to them.

Oh well, I know less about C++ than any of you guys anyway. I haven't taken a course in it in a few years now, so I've forgotten what little I knew at the time!

Whenever I try to compile it, using Bloodshed dev-c++ version 4, I get these errors:

C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `gethostpoop':
//c/netcat/netcat.c:535: undefined reference to `inet_addr@4'
//c/netcat/netcat.c:540: undefined reference to `gethostbyname@4'
//c/netcat/netcat.c:544: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:548: undefined reference to `inet_ntoa@4'
//c/netcat/netcat.c:556: undefined reference to `gethostbyaddr@12'
//c/netcat/netcat.c:559: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:567: undefined reference to `inet_ntoa@4'
//c/netcat/netcat.c:572: undefined reference to `gethostbyaddr@12'
//c/netcat/netcat.c:575: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:578: undefined reference to `gethostbyname@4'
//c/netcat/netcat.c:580: undefined reference to `WSAGetLastError@0'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `getportpoop':
//c/netcat/netcat.c:628: undefined reference to `htons@4'
//c/netcat/netcat.c:629: undefined reference to `getservbyport@8'
//c/netcat/netcat.c:631: undefined reference to `ntohs@4'
//c/netcat/netcat.c:651: undefined reference to `getservbyname@8'
//c/netcat/netcat.c:654: undefined reference to `ntohs@4'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `doconnect':
//c/netcat/netcat.c:799: undefined reference to `WSASetLastError@4'
//c/netcat/netcat.c:805: undefined reference to `socket@12'
//c/netcat/netcat.c:811: undefined reference to `setsockopt@20'
//c/netcat/netcat.c:836: undefined reference to `htons@4'
//c/netcat/netcat.c:848: undefined reference to `inet_ntoa@4'
//c/netcat/netcat.c:842: undefined reference to `bind@12'
//c/netcat/netcat.c:855: undefined reference to `inet_ntoa@4'
//c/netcat/netcat.c:862: undefined reference to `htons@4'
//c/netcat/netcat.c:938: undefined reference to `connect@12'
//c/netcat/netcat.c:942: undefined reference to `WSASetLastError@4'
//c/netcat/netcat.c:951: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:952: undefined reference to `closesocket@4'
//c/netcat/netcat.c:953: undefined reference to `WSASetLastError@4'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `dolisten':
//c/netcat/netcat.c:987: undefined reference to `listen@8'
//c/netcat/netcat.c:1000: undefined reference to `getsockname@12'
//c/netcat/netcat.c:1005: undefined reference to `inet_ntoa@4'
//c/netcat/netcat.c:1009: undefined reference to `ntohs@4'
//c/netcat/netcat.c:1022: undefined reference to `recvfrom@24'
//c/netcat/netcat.c:1040: undefined reference to `connect@12'
//c/netcat/netcat.c:1048: undefined reference to `accept@12'
//c/netcat/netcat.c:1053: undefined reference to `closesocket@4'
//c/netcat/netcat.c:1104: undefined reference to `getsockname@12'
//c/netcat/netcat.c:1107: undefined reference to `inet_ntoa@4'
//c/netcat/netcat.c:1118: undefined reference to `ntohs@4'
//c/netcat/netcat.c:1119: undefined reference to `inet_ntoa@4'
//c/netcat/netcat.c:1141: undefined reference to `closesocket@4'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `readwrite':
//c/netcat/netcat.c:1444: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:1447: undefined reference to `closesocket@4'
//c/netcat/netcat.c:1417: undefined reference to `WSASetLastError@4'
//c/netcat/netcat.c:1434: undefined reference to `select@20'
//c/netcat/netcat.c:1440: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:1473: undefined reference to `closesocket@4'
//c/netcat/netcat.c:1475: undefined reference to `WSASetLastError@4'
//c/netcat/netcat.c:1484: undefined reference to `__WSAFDIsSet@8'
//c/netcat/netcat.c:1489: undefined reference to `recv@16'
//c/netcat/netcat.c:1603: undefined reference to `send@16'
//c/netcat/netcat.c:1623: undefined reference to `__WSAFDIsSet@8'
//c/netcat/netcat.c:1631: undefined reference to `closesocket@4'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `main':
//c/netcat/netcat.c:230: undefined reference to `WSAStartup@8'
//c/netcat/netcat.c:247: undefined reference to `WSACleanup@0'
//c/netcat/netcat.c:1764: undefined reference to `optarg'
//c/netcat/netcat.c:1775: undefined reference to `optarg'
//c/netcat/netcat.c:1788: undefined reference to `optarg'
//c/netcat/netcat.c:1793: undefined reference to `optarg'
//c/netcat/netcat.c:1800: undefined reference to `optarg'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o://c/netcat/netcat.c:1803: more undefined references to `optarg' follow
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `main':
//c/netcat/netcat.c:1840: undefined reference to `getopt'
//c/netcat/netcat.c:1872: undefined reference to `optind'
//c/netcat/netcat.c:1877: undefined reference to `optind'
//c/netcat/netcat.c:1889: undefined reference to `optind'
//c/netcat/netcat.c:1892: undefined reference to `optind'
//c/netcat/netcat.c:1918: undefined reference to `optind'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o://c/netcat/netcat.c:1920: more undefined references to `optind' follow
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `main':
//c/netcat/netcat.c:1165: undefined reference to `send@16'
//c/netcat/netcat.c:1184: undefined reference to `closesocket@4'
//c/netcat/netcat.c:1193: undefined reference to `send@16'
//c/netcat/netcat.c:1200: undefined reference to `closesocket@4'
//c/netcat/netcat.c:1985: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:1993: undefined reference to `closesocket@4'
//c/netcat/netcat.c:2004: undefined reference to `optind'
//c/netcat/netcat.c:2004: undefined reference to `optind'
//c/netcat/netcat.c:2012: undefined reference to `WSACleanup@0'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `res_init':
//c/netcat/netcat.c:230: undefined reference to `WSAStartup@8'
//c/netcat/netcat.c:247: undefined reference to `WSACleanup@0'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `holler':
//c/netcat/netcat.c:336: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:337: undefined reference to `WSAGetLastError@0'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `bail':
//c/netcat/netcat.c:336: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:337: undefined reference to `WSAGetLastError@0'
//c/netcat/netcat.c:358: undefined reference to `closesocket@4'
C:\DOCUME~1\JAREDJ~1\LOCALS~1\Temp\cc08caaa.o: In function `udptest':
//c/netcat/netcat.c:1165: undefined reference to `send@16'
//c/netcat/netcat.c:1184: undefined reference to `closesocket@4'
//c/netcat/netcat.c:1193: undefined reference to `send@16'
//c/netcat/netcat.c:1200: undefined reference to `closesocket@4'



All I'm doing to compile it is loading Netcat.c and hitting compile, so I'm probably doing it wrong. And to whoever said I should learn to do it myself, I think compiling it with help from you guys is a step in the right direction compared to just running the binary. (Which I'm doing for now)

i dnot think dev-cpp will do it. i have it on this computer but when i go to the folder in dos that contains the nc files and type gcc makefile i get:

C:\nc>gcc makefile
C:\Dev-Cpp\bin\..\lib\gcc-lib\mingw32\3.2\..\..\..\..\mingw32\bin\ld.exe:makefile: file format n
ot recognized; treating as linker script
C:\Dev-Cpp\bin\..\lib\gcc-lib\mingw32\3.2\..\..\..\..\mingw32\bin\ld.exe:makefile:3: parse error

Can you recommend a free compiler that would run on win-xp please? :)

cygwin w/ gcc?

I'd go with gcc.

Quote:

---

Originally posted here by Tedob1
i dnot think dev-cpp will do it. i have it on this computer but when i go to the folder in dos that contains the nc files and type gcc makefile i get:

C:\nc>gcc makefile
C:\Dev-Cpp\bin\..\lib\gcc-lib\mingw32\3.2\..\..\..\..\mingw32\bin\ld.exe:makefile: file format n
ot recognized; treating as linker script
C:\Dev-Cpp\bin\..\lib\gcc-lib\mingw32\3.2\..\..\..\..\mingw32\bin\ld.exe:makefile:3: parse error

---

gcc makefile wont' do anything for you.. You'd need to type 'make -f makefile' and the make file calls gcc to compile the lines. The errors you are getting is because gcc has no idea what to do with a makefile. However you were indirectly correct. GCC will return WINMAIN@16 errors because it's not sure what to do with all the code. The reason for this is that NC 1.1 for Windows was developed using VC++ and must be compiled with VC++ (unless you want to edit the code). I'm no programmer, so there may be a way around this.. but this is how I understand it.

Anyways I decided to start from scratch and forget that I had VS .Net installed. Including download and install time for the packages I needed (and this included googling links for NC source, and all the compile-related apps I needed) took 15 minutes. Now I'm a lowly student, I don't even have a diploma.... so I see no need why this should take any longer for anyone else... Especially since I'm going to provide you with the links and tell you exactly what to do. I will post it in here, and then make take some time and write out a fully detailed tutorial on how to compile NC for Windows (so no one steal my walk-through and copy it :)... I'll kick yer ass)....

Anyways... Let's get all the files we need first.
.Net Framework 1.1 Redistributable Package
.Net Framework SDK V. 1.1
[url=http://www.microsoft.com/downloads/details.aspx?FamilyId=272BE09D-40BB-49FD-9CB0-4BFA122FA91B&displaylang=en]Visual C++ Toolkit 2003
nmake for Windows
NetCat for Windows V 1.1

When you download the SDK It may provide you with nmake. If it doesnt, just add it to the directory that you installed the C++ toolkit (bin directory) to. Also the SDK should provide you with winsock2.h and wsock32.lib (which are needed to compile netcat). However I'm not sure if they were installed or not (having VS installed already seems to have confused things a little.... I'll make a VM later to test if no one has attempted it by tomorrow evening and I'll let you know for sure). Now you should beable to take the .c files, the .h files and the makefile out of the NetCat archive and paste them into your Toolkit bin/ directory. Then simply open a command prompt and browse to the directory and run nmake (you could just double click on it, but then you won't see any error messages). Everything should compile just fine. If you have additional problems check to see what your errors are. A common error may be a file missing (stdio.h, winsock2.h, kernel32.lib, wsock32.lib). If it tells you a file is missing, just search your computer for it.. If you find it go to your command prompt and type the following
Header (.h) Files: set include=%include%;<path to file>
Library (.lib) Files: set lib=%lib%;<path to file>
<path to file> represents the directory location that search returned. It should always be some folder/lib or somefolder/include.. i.e C:\Program Files\Microsoft Visual C++ ToolKit\include

If you have any other types of errors, paste them here and I'll let ya know what to do. Just remember I'm not a programmer, but like I said.. it took me about 15 minutes.

Peace,
HT

[edit]
As chsh so "kindly" pointed out.. I forgot the -f in my 'make makefile'... it's corrected above
[/edit]

Quote:

---

Originally posted here by Tedob1
[B]your right AngelicKnight. this guys done nothing wrong. he asked a question i must admit i dont quite understand.[/q]

---

So let me get this straight, you didn't understand the question, but proceeded to respond anyway? You're just as guilty of giving an idiotic answer as TheSpecialist, lol.

Quote:

---

but im not going to jump on his case because of it. hes been called retarded for not downloading something that he did download and for not compleatly understanding programming.

---

I'm all for helping people who will at least help themselves.

Quote:

---

Originally posted here by Tedob1
when i started playing with nc a windows binary was not available and i only had windows computers. i tried a few times to compile it but keep getting errors from the makefile i didn't understand. btw there are two src files and two header files along with a makefile in the nc archive. not the easiest thing for a newbie used to using windows. if i had to compile everything i used id probably be deep in the rewarding field of manual labor. while unix, linux and their apps needed to be compiled it was all done automatically with a make. so even after installing it i still didn't have a clue. i think we all forget how far we've come

---

There's a difference between knowing something, and being intelligent enough to try and help yourself learn.
I personally don't expect most people to just "know something", but I do expect they be intelligent enough to try and help themselves.

EDIT: Damn, censorship on this board seems to be at an all-time high.

chsh, I think we've already concluded that little debate bro', we're moving on now. You're beating a dead horse. :)

On the makefile thing....you're both suffering from pebcak. I'd strongly suggest you learn how makefile's work. You might also want to pick up the oreilly book on 'autoconf, automake, and the lib tools'.

You don't run the makefile through gcc. And you don't run 'make makefile'. Generally the command is 'make <target>' with target being a specific group of settings inside the makefile.

The most common settings you will use are 'make' 'make install' and 'make clean'. Though it's pretty much open to whatever the developer likes.