Is This C Code for Windows or C for Unix?

Question

0.00/5 (No votes)

See more:

<pre lang="cs">

#include "pcap.h"
main()
{
    pcap_if_t *alldevs;
    pcap_if_t *d;
    int i=0;
    char errbuf[PCAP_ERRBUF_SIZE];
    /* Retrieve the device list from the local machine */
    if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL /* auth is not needed */, &alldevs, errbuf) == -1)
    {
        fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
        exit(1);
    }
    /* Print the list */
    for(d= alldevs; d != NULL; d= d->next)
    {
        printf("%d. %s", ++i, d->name);
        if (d->description)
            printf(" (%s)\n", d->description);
        else
            printf(" (No description available)\n");
    }
    if (i == 0)
    {
        printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
        return;
    }
    /* We don't need any more the device list. Free it */
    pcap_freealldevs(alldevs);
}

Posted 13-Apr-11 13:17pm

Member 7766180

Updated 13-Apr-11 13:30pm

LloydA111

v2

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

LloydA111 · Accepted Answer · 2011-04-13T13:30:00

Solution 1

By the looks of it, it is using PCAP. PCAP runs on Windows and *NIX.

Posted 13-Apr-11 13:30pm

LloydA111

Updated 13-Apr-11 13:34pm

v2

Comments

Member 7766180 13-Apr-11 19:31pm

It is PCAP but why won't it compile? I'm getting several errors. Using Borland C++ 5.5.1 Free compiler.

LloydA111 13-Apr-11 19:33pm

Well what errors are you getting?

Member 7766180 13-Apr-11 19:36pm

Here are the errors-------

Error E2451 DEVV.c 5: Undefined symbol 'pcap_if_t' in function main
Error E2451 DEVV.c 5: Undefined symbol 'alldevs' in function main
Error E2451 DEVV.c 6: Undefined symbol 'd' in function main
Error E2140 DEVV.c 7: Declaration is not allowed here in function main
Error E2140 DEVV.c 8: Declaration is not allowed here in function main
Error E2451 DEVV.c 8: Undefined symbol 'PCAP_ERRBUF_SIZE' in function main
Error E2451 DEVV.c 11: Undefined symbol 'PCAP_SRC_IF_STRING' in function main
Error E2451 DEVV.c 11: Undefined symbol 'NULL' in function main
Warning W8065 DEVV.c 11: Call to function 'pcap_findalldevs_ex' with no prototyp
e in function main
Error E2451 DEVV.c 13: Undefined symbol 'stderr' in function main
Warning W8065 DEVV.c 13: Call to function 'fprintf' with no prototype in functio
n main
Warning W8065 DEVV.c 14: Call to function 'exit' with no prototype in function m
ain
Warning W8065 DEVV.c 20: Call to function 'printf' with no prototype in function
main
Warning W8065 DEVV.c 22: Call to function 'printf' with no prototype in function
main
Warning W8065 DEVV.c 24: Call to function 'printf' with no prototype in function
main
Warning W8065 DEVV.c 29: Call to function 'printf' with no prototype in function
main
Warning W8065 DEVV.c 34: Call to function 'pcap_freealldevs' with no prototype i
n function main
Warning W8070 DEVV.c 35: Function should return a value in function main

LloydA111 13-Apr-11 19:39pm

Firstly, you need to #include stdio.h to be able to use printf. (You need to enclose stdio.h with < and > )

Also, are you sure the pcap.h header file exists in the place the compiler is looking?

Member 7766180 13-Apr-11 19:48pm

Down to 8 Errors now. pcap.h is in the same directory.
Thank you for your help.

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\DS>cd\test

C:\TEST>bcc32 devv.c
Borland C++ 5.5.1 for Win32 Copyright (c) 1993, 2000 Borland
DEVV.c:
Error E2209 pcap.h 45: Unable to open include file 'pcap/pcap.h'
Error E2451 DEVV.c 5: Undefined symbol 'pcap_if_t' in function main
Error E2451 DEVV.c 5: Undefined symbol 'alldevs' in function main
Error E2451 DEVV.c 6: Undefined symbol 'd' in function main
Error E2140 DEVV.c 7: Declaration is not allowed here in function main
Error E2140 DEVV.c 8: Declaration is not allowed here in function main
Error E2451 DEVV.c 8: Undefined symbol 'PCAP_ERRBUF_SIZE' in function main
Error E2451 DEVV.c 11: Undefined symbol 'PCAP_SRC_IF_STRING' in function main
Error E2451 DEVV.c 11: Undefined symbol 'NULL' in function main
Warning W8065 DEVV.c 11: Call to function 'pcap_findalldevs_ex' with no prototyp
e in function main
Error E2451 DEVV.c 13: Undefined symbol 'stderr' in function main
Warning W8065 DEVV.c 13: Call to function 'fprintf' with no prototype in functio
n main
Warning W8065 DEVV.c 14: Call to function 'exit' with no prototype in function m
ain
Warning W8065 DEVV.c 20: Call to function 'printf' with no prototype in function
main

Error E2209 pcap.h 45: Unable to open include file 'pcap/pcap.h'
Error E2451 Four.c 6: Undefined symbol 'pcap_if_t' in function main
Error E2451 Four.c 6: Undefined symbol 'alldevs' in function main
Error E2451 Four.c 7: Undefined symbol 'd' in function main
Error E2140 Four.c 8: Declaration is not allowed here in function main
Error E2140 Four.c 9: Declaration is not allowed here in function main
Error E2451 Four.c 9: Undefined symbol 'PCAP_ERRBUF_SIZE' in function main
Error E2451 Four.c 12: Undefined symbol 'PCAP_SRC_IF_STRING' in function main
Warning W8065 Four.c 12: Call to function 'pcap_findalldevs_ex' with no prototyp
e in function main
Warning W8065 Four.c 15: Call to function 'exit' with no prototype in function m
ain
Warning W8065 Four.c 35: Call to function 'pcap_freealldevs' with no prototype i
n function main
Warning W8070 Four.c 36: Function should return a value in function main
*** 8 errors in Compile ***

Albert Holguin · Accepted Answer · 2011-04-13T13:54:00

Solution 2

you're probably not including the .lib file are you?

first, make sure that those functions are defined in pcap.h (which they probably are), make sure you have the #define statements that pcap.h probably needs to compile in windows (I'm sure if you look up info on pcap.h you'll find out, or it may be written at the top of the header, or it may be specified in a document that came with the library), then make sure you're linking the appropriate .lib file.

[edit]
all this is standard C, so it should work regardless of platform.
[/edit]

Posted 13-Apr-11 13:54pm

Albert Holguin

Updated 13-Apr-11 13:58pm

v3

Comments

Member 7766180 13-Apr-11 20:04pm

Ok I think the problem might be the lib files. Which ones do I need? Where do I place and link them? And most important where do I find them. Thank you.
DS

Albert Holguin 13-Apr-11 20:06pm

where did you get this code from? look for an explanation there... the winpcap library is a common library, so you can also google to get some answers. i think the programming you're trying to do is a bit above your head.

Member 7766180 13-Apr-11 20:09pm

Your right, it is above my head at this point. But I don't have a choice to stop, in a deep corneron this one. Got the code from the WinPcap site, they make it sound simple but....
Thanks
DS

Albert Holguin 13-Apr-11 20:11pm

lol... they always make it sound simple... its probably simple for an advanced C/C++ programmer... the real trick will be to look over as much of the documentation as you possibly can.

Albert Holguin 13-Apr-11 20:12pm

here's the link telling you how to build this:
http://www.winpcap.org/docs/docs_40_2/html/group__wpcapsamps.html

Member 7766180 13-Apr-11 20:07pm

Just looked in my pcap.h file There are absolutly no functions to be found! Oh Oh!
DS

Albert Holguin 13-Apr-11 20:08pm

Read this...
http://www.winpcap.org/docs/docs_40_2/html/main.html

Member 7766180 13-Apr-11 20:17pm

Done Include the file pcap.h at the beginning of every source file that uses the functions exported by library.

If your program uses Win32 specific functions of WinPcap, remember to include WPCAP among the preprocessor definitions.

Like this? #Include WPCAP

If your program uses the remote capture capabilities of WinPcap, add HAVE_REMOTE among the preprocessor definitions. Do not include remote-ext.h directly in your source files.
Don't Need this do I?

Set the options of the linker to include the wpcap.lib library file. wpcap.lib can be found in the WinPcap developer's pack.
Where is Linker on notepad?

Set the options of the linker to include the winsock library file ws2_32.lib. This file is distributed with the C compiler and contains the socket functions for Windows. It is needed by some functions used by the samples in the tutorial.
Again, Where is Linker?

Thank you once again.
DS

Albert Holguin 13-Apr-11 20:25pm

answer 1) #define WPCAP
answer 2) you prob don't need HAVE_REMOTE
answer 3) you're going to have to go to borland website to figure out how to set all these settings for that compiler

Member 7766180 13-Apr-11 23:08pm

Hey Hey Hey, Only two errors! Almost there!
error C2065: 'PCAP_SRC_IF_STRING' : undeclared identifier c:\fbcode\winpcaptest\winpcaptest\winpcaptest.cpp 15 1 winpcaptest

error C3861: 'pcap_findalldevs_ex': identifier not found c:\fbcode\winpcaptest\winpcaptest\winpcaptest.cpp 15 1 winpcaptest
Must be missing from the header file or the wrong path?
DS

Albert Holguin 13-Apr-11 23:13pm

PCAP_SRC_IF_STRING sounds like a macro, or enumeration, or typedef. Do a search within the text files and see if you find out what file its defined in, then check the file linkage between the error and the location of the definition (as in make sure it can find that definition). The other one looks like a function, so same thing, just look for where its defined and make sure there's some sort of path there.

Member 7766180 13-Apr-11 23:18pm

Thank you Albert! Your are the best! I appreciate the help! Off to bed will continue tommorrow with your suggestions!
DS

Albert Holguin · Accepted Answer · 2011-04-13T14:22:00

From WinPcap (almighty google took me there):

Creating an application that uses wpcap.dll:

To create an application that uses wpcap.dll with Microsoft Visual C++, follow these steps:
-Include the file pcap.h at the beginning of every source file that uses the functions exported by library.
-If your program uses Win32 specific functions of WinPcap, remember to include WPCAP among the preprocessor definitions.
-If your program uses the remote capture capabilities of WinPcap, add HAVE_REMOTE among the preprocessor definitions. Do not include remote-ext.h directly in your source files.
-Set the options of the linker to include the wpcap.lib library file. wpcap.lib can be found in the WinPcap developer's pack.
-Set the options of the linker to include the winsock library file ws2_32.lib. This file is distributed with the C compiler and contains the socket functions for Windows. It is needed by some functions used by the samples in the tutorial.

Remember that:

-To add a preprocessor definition, you must select Settings from the Project menu, then select C/C++ from the tab control, and under the category General, you must add the definition under the Preprocessor Definitions text box.
-To add a new library to the project with Microsoft Visual C++ 6.0, you must select Settings from the Project menu, then select Link from the tab control, and then add the name of the new library in the Object/library modules edit box.
-To add a new path where Microsoft Visual C++ 6.0 will look for the libraries, you must select Options from the Tools menu, then Directories from the tab control, Library files from the Show directories for combo box, and the add the path in the Directories box.
-To add a new path where Microsoft Visual C++ 6.0 will look for include files, you must select Options from the Tools menu, then Directories from the tab control, Include files from the Show directories for combo box, and the add the path in the Directories box.

...and from looking at the package that they give for development, you're going to have to figure out how to set default include directories for your compiler (I'm not sure how to do it for the compiler you're using) because the files are all linked to one another based on default settings (they #include<> one another).