cross compiling tcpdump

[Piotr Kirklewski]

Hi there
I'm compiling tcpdump for my Linksys router.
libcap compiles fine but compiling tcpdump gives me a bunch of errors.

I'm dooing this:

wget http://www.tcpdump.org/release/libpcap-1.0.0.tar.gz

wget http://www.tcpdump.org/release/tcpdump-4.0.0.tar.gz

wget ftp://ftp.dd-wrt.com/others/sourcecode/toolchains/toolchains.x86.debian.sp1.tar.bz2

tar -xvf libpcap-1.0.0.tar.gz

tar -xvf tcpdump-4.0.0.tar.gz

cd /root/libpcap-1.0.0

CC=mipsel-linux-uclibc-gcc ac_cv_linux_vers=2 ./configure --host=mipsel-linux --with-pcap=linux

make

cd ../tcpdump-4.0.0

CC=mipsel-linux-uclibc-gcc ac_cv_linux_vers=2 ./configure --host=mipsel-linux --with-pcap=linux

make

...
./../libpcap-1.0.0/libpcap.a(pcap.o): In function `pcap_datalink_name_to_val':
pcap.c:(.text+0x1b8): multiple definition of `pcap_datalink_name_to_val'
dlnames.o:dlnames.c:(.text+0xe8): first defined here
./../libpcap-1.0.0/libpcap.a(pcap.o): In function `pcap_datalink_val_to_name':
pcap.c:(.text+0x26c): multiple definition of `pcap_datalink_val_to_name'
dlnames.o:dlnames.c:(.text+0x0): first defined here
./../libpcap-1.0.0/libpcap.a(pcap.o): In function `pcap_datalink_val_to_description':
pcap.c:(.text+0x2d4): multiple definition of `pcap_datalink_val_to_description'
dlnames.o:dlnames.c:(.text+0x68): first defined here
./../libpcap-1.0.0/libpcap.a(pcap.o): In function `pcap_list_datalinks':
pcap.c:(.text+0xfbc): multiple definition of `pcap_list_datalinks'
datalinks.o:datalinks.c:(.text+0x0): first defined here
./../libpcap-1.0.0/libpcap.a(savefile.o): In function `pcap_dump_ftell':
savefile.c:(.text+0xd8): multiple definition of `pcap_dump_ftell'
pcap_dump_ftell.o:pcap_dump_ftell.c:(.text+0x0): first defined here
print-enc.o: In function `enc_if_print':
print-enc.c:(.text+0x1e0): undefined reference to `ip6_print'
./../libpcap-1.0.0/libpcap.a(grammar.o): In function `pcap_parse':
grammar.c:(.text+0x5e0): undefined reference to `pcap_lex'
collect2: ld returned 1 exit status
make: *** [tcpdump] Error 1

Anyone knows how to sort it out ?

Regards

Peter

[Dennis Handly · Accepted solution]

What is your host OS? What is your target OS?

You appear to have both duplicate symbols and unsats.
pcap_datalink_name_to_val appears to be in both pcap.c and dlnames.c. Etc.
You are also missing: ip6_print pcap_lex

[Piotr Kirklewski]

Hi
My OS is Red Hat Linux 7.2.
My target OS is a firmware for Linksys WRT54GL called DD-WRT.
I downloaded the toolchains from here: ftp://ftp.dd-wrt.com/others/sourcecode/toolchains/

And I know it works:

touch /root/hello.c

cat > ~/hello.c<< "EOF"

#include

int main ( void ) {
printf( "Hello world!\n" );
}
EOF

mipsel-linux-uclibc-gcc hello.c -o hello

Above commands work fine and the hello program works fine on my router :)

So I'm absolutely sure that it's not broken toolchains that affects me.

I know it's not linux forum but the linux forum does not have a "programming" section.
So I hope somebody will be so kind to help me here.

Can anyone check how the compilation goes on your system ?

I pretty much gave the instructions on what I'm doing in the initial post.

Regards

Peter

[rick jones]

Willingness or no of folks watching this forum to help notwithstanding, you may have better luck going straight to the tcpdump-workers mailing list: tcpdump-workers@lists.tcpdump.org

I cannot recall if one needs to be subscribed first, but I suspect that there will be links off of www.tcpdump.org with that information.