Re: libpcap in Cocoa
Re: libpcap in Cocoa
- Subject: Re: libpcap in Cocoa
- From: Ivan Myrvold <email@hidden>
- Date: Mon, 20 Aug 2001 22:36:22 +0200
I am sorry, but I do not know how to "link against the library" (what
library btw?), nor "add -lpcap to the LDFLAGS". I have not met this sort
of thing before when making ordinary cocoa apps, but I am eager to learn.
Ivan
On mandag, august 20, 2001, at 09:36 , Finlay Dobbie wrote:
You're not linking against the library. Add it to the project, or just
add -lpcap to the LDFLAGS in Target Settings.
-- Finlay
On Monday, August 20, 2001, at 12:16 pm, Ivan Myrvold wrote:
Here is the complete messages from the compile:
Completed phase <DeriveAndCompileSources> for Esther.app
StandaloneExecutable
/Users/imyrvold/Documents/Cocoa/Esther/build/Esther.app/Contents/MacOS/Esther
/usr/bin/ld: warning prebinding disabled because of undefined symbols
/usr/bin/ld: Undefined symbols:
_pcap_lookupdev
/usr/bin/cc -o
"/Users/imyrvold/Documents/Cocoa/Esther/build/Esther.app/Contents/MacOS/
Esther"
"-L/Users/imyrvold/Documents/Cocoa/Esther/build"
"-F/Users/imyrvold/Documents/Cocoa/Esther/build/ProjectHeaders"
"-F/Users/imyrvold/Documents/Cocoa/Esther/build" -filelist
"/Users/imyrvold/Documents/Cocoa/Esther/build/intermediates/Esther.build/
Objects/
LinkFileList" "-arch" "ppc" "-prebind" "-framework" "Cocoa"
...failed StandaloneExecutable.LinkUsingFileList
/Users/imyrvold/Documents/Cocoa/Esther/build/Esther.app/Contents/MacOS/Esther
...
Ivan
On mandag, august 20, 2001, at 11:26 , Ivan Myrvold wrote:
I followed your advice, and compiled libpcap after your earlier
message:
Building libpcap:
% gzip -cd libpcap-0.6.2.tar.gz | tar xf -
tar: Could not create: libpcap-0.6.2/. <File exists> <-- stupid
error
% cd libpcap-0.6.2
% ./configure --prefix=/usr/local/pcap
% make
% mv install install.stupid
% sudo make install
Now, pcap.h is in directory /usr/local/pcap/include,
But I got exactly the same compiler error:
Linking
/Users/imyrvold/Documents/Cocoa/Esther/build/Esther.app/Contents/MacOS/
Esther
(1 error, 1 warning).
warning prebinding disabled because of undefined symbols
Undefined symbols:
I have the feeling that I am missing out on something here. What I am
doing is very simple. In MyWindowController, at the top, I have:
#import "MyWindowController.h"
#import "MySettings.h"
#include "pcap.h"
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/if_ether.h> /* includes net/ethernet.h */
@implementation MyWindowController
// Initialization
etc......
In an IBAction for a button, I put this (only to see that it could
compile OK):
- (IBAction)doCapture:(id)sender {
char *dev; /* name of the device to use */
char errbuf[PCAP_ERRBUF_SIZE];
/* ask pcap to find a valid device for use to sniff on */
dev = pcap_lookupdev(errbuf);
}
That's it. Do I need to do more, to get this to compile (I mean link).
Ivan
On mandag, august 20, 2001, at 02:14 , Todd Heberlein wrote:
But these are defined in pcap.h
What am I doing wrong here?
Not sure, but there may be a mismatch between the pcap package that
you
grabbed the pcap.h file from and the pcap library that you are
linking
against. Apple provides its own pcap library, but since they do not
include any header files, we cannot know what APIs are supported by
the
library. If you are linking against it, you may have some problems.
I would recommend you actually build and install a fresh copy of
pcap,
and then do #import <pcap.h>, set up the appropriate additional
INCLUDE
and LIBRARY paths in your target panes to pick up your installation
paths, and include -lpcap in the target pane as well. That should
pick
up your own build of the package.
I was able to link against it and read tcpdump files from a packet
file.
Todd
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