Re: Re: compile failed when using pcap, "undefined reference to `pcap_set_datalink"

[Jan Pomahač <honza () ekc cz>]

Hi Arthur,

if you want libpcap library installed into /usr/lib and headers into
/usr/include you should run

./configure --prefix=/usr

Try ./configure --help for more information.

Honza

----- Original Message ----- 
From: "Arthur Chen" <iamarthur60 () hotmail com>
To: <tcpdump-workers () tcpdump org>
Sent: Friday, November 28, 2003 2:21 PM
Subject: [tcpdump-workers] Re: compile failed when using pcap, "undefined
reference to `pcap_set_datalink"


> Hi all,
>     now I have found part of the error.
> 1) my system is redhat 9.0, and I installed pcap with these steps:
>                 root# ./configure
>                 root# ./make
>                 root# ./make install
>    with these steps, in the Makefile's item 'install:', it showed out
these
> things to do
>            (a) copy libpcap.a to /usr/local/lib,
>            (b)copy pcap.h, pcap-named.h pcap-bpf.h to /usr/local/include
> 2) It seems the 'configure' shell is wrong,
>            (a) copy libpcap.a to /usr/local/lib,----this should be copy to
> /usr/lib
>            (b)copy pcap.h, pcap-named.h pcap-bpf.h to
> /usr/local/include-----this is wrong, should be copy to /usr/include
>
> 3)But after I copied them to the correct place, I still can not compile,
the
> error is still be:
> "undefined reference to 'pcap_set_datalink'"
> I have noticed that under the directory /usr/lib, there are several shared
> library files called libpcap.so,
> libpcap.so.0,libpcap.so.0.6,libpcap.so.0.6.2 , they might be the key
> problem---because when I make and instal the new PCAP library, I didn't
see
> that there were any of these files be createdl:
>
> ----anybody help me!
>
>
>
>
>
>
> > From: "Arthur Chen" <iamarthur60 () hotmail com>
> > To: tcpdump-workers () tcpdump org
> > Subject: [tcpdump-workers] small program compile failed when using pcap,
> > "undefined reference to `pcap_set"
> > Date: Thu, 27 Nov 2003 23:00:02 +0000
> >
> > this small trying program can not compile, It said undefined reference to
> > `pcap_set_datalink', but this function prototype was included in pcap.h
and
> > was implemented in pcap.c! Any idea?
> >
> >     This is the error message:
> >
> > [root@ arthur]# gcc -lpcap -o pcap_test.o pcap_test.c
> > /tmp/ccViVFVU.o(.text+0xbb): In function `main':
> > : undefined reference to `pcap_set_datalink'
> > collect2: ld returned 1 exit status
> > [root@ arthur]#
> >
> >
> >      the source file is:
> >
> > #include <stdio.h>
> > #include <pcap.h>
> > //#include <pcap_int.h>
> > extern int pcap_set_datalink(pcap_t *, int);
> >    int main()
> >    {
> >        pcap_t *handle;                       /* Session handle */
> > //      char *dev;                            /* The device to sniff on
*/
> >        char errbuf[PCAP_ERRBUF_SIZE];        /* Error string */
> >        struct bpf_program filter;            /* The compiled filter */
> > //      char filter_app[] = "port 23";        /* The filter expression */
> >        char filter_app[] = "ether[11]=0xcb || (ether[5]=0xcb)";
> >        bpf_u_int32 mask;                     /* Our netmask */
> >        bpf_u_int32 net;                      /* Our IP */
> >        struct pcap_pkthdr header;            /* The header that pcap
gives
> > us */
> >        const u_char *packet;                 /* The actual packet */
> >        /* Define the device */
> > //        dev = pcap_lookupdev(errbuf);
> > char dev[]="eth0";
> > int errCode=0;
> >
> > bpf_u_int32 counter=0;
> > printf("the dev=%s\n",dev);
> >
> >        /* Find the properties for the device */
> >        pcap_lookupnet(dev, &net, &mask, errbuf);
> > /* Open the session in promiscuous mode */
> >        handle = pcap_open_live(dev, BUFSIZ, 1, 0, errbuf);
> > //printf("The data link is %d",(pcap_datalink(handle)));
> > pcap_set_datalink(handle, DLT_PPP_ETHER);
> >
> > if (errCode)
> > printf("Set data link failed, error code=%d",errCode);
> > else
> > printf("Set data link succeeded, ");
> >
> > /* Compile and apply the filter */
> > //        pcap_compile(handle, &filter, filter_app, 0, net);
> >        pcap_compile(handle, &filter, filter_app, 0, net);
> > pcap_setfilter(handle, &filter);
> >        /* Grab a packet */
> >
> > packet = pcap_next(handle, &header);
> >        /* Print its length */
> >        printf("Jacked a packet with length of [%d]\n", header.len);
> >        /* And close the session */
> > for (; counter<header.len; counter++)
> > printf("%3x", *(packet+counter));
> >
> > pcap_close(handle);
> >
> >        return(0);
> >    }
> >
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