Re: configure script problem while working on extention

[Christian via tcpdump-workers <tcpdump-workers () lists tcpdump org>]

> --- Begin Message ---
>
>
> From: Christian <chris () argonautx net>
>
> Date: Mon, 15 Aug 2022 14:31:18 +0200
>
> > > Then I opened the tcpdump.zip archive
> > (.zip?  Not .tar.gz?  The current releases from
> >
> >         https://www.tcpdump.org/index.html#latest-releases
> >
> > are provided in .tar.gz form, as are all the other release in
> >
> >         https://www.tcpdump.org/release/
> >
> > Gzipped tarballs are probably easier to extract on a UN*X, as they're likely to have either a version of tar that reads gzipped files or 
> > have gzcat and tar; to unpack a zip archive requires a command such as unzip or a GUI tool that unpacks zip archives.  Perhaps you mean 
> > ".zip archive" in a metaphorical sense of "some form of archive"?  Or is this a ZIP archive provided by somebody other than 
> > tcpdump.org?)
>
>
> Okay I was not quite consequent, got the sources of libpcap from git but 
> tcpdump from the zip archive of github. But today I tried it again with 
> git. And this time I didn't put it into the libpcap directory but into 
> the parent directory, so that they have the same parent. But the result 
> remains the same.
>
> > No, they're not attached.  Either you forgot to attach them or some mail software stripped the attachments.  
> > Michael/Denis/François - do we strip attachments at any point before sending messages to the list?
>
> Okay bad idea of mine, attached files are hard to comment in a list anyway.
>
> Now I paste it here:
>
> pcap-kpnode.c
>
> #include <stdlib.h>
> #include "pcap-int.h"
> #include <limits.h>
> #include <string.h>
> #include <stdio.h>
>
> #define LINUX_KPNODE_DEV "/dev/kpnode0"
> #define KPNODE_IFACE "kpnode"
> #define KPNODE_LINE_LEN 4096
>
> struct pcap_kpnode {
>
> };
>
>
> /* facility to add an USB device to the device list*/
> static int
> kpnode_dev_add(pcap_if_list_t *devlistp, int n, char *err_str)
> {
>     char dev_name[10];
>     char dev_descr[30];
>     snprintf(dev_name, 10, KPNODE_IFACE"%d", n);
>     /*
>      * XXX - is there any notion of "up" and "running"?
>      */
>     /*
>      * As this refers to all buses, there's no notion of
>      * "connected" vs. "disconnected", as that's a property
>      * that would apply to a particular USB interface.
>      */
>     if (add_dev(devlistp, dev_name,
>         PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE,
>         "Open kpnode interface ", err_str) == NULL)
>         return -1;
>
>
>     return 0;
> }
>
> int
> kpnode_findalldevs(pcap_if_list_t *devlistp, char *err_str)
> {
>     char kpnode_dev[PATH_MAX];
>     char *kpnode_prefix;
>     //size_t usb_mon_prefix_len;
>     //struct dirent* data;
>     // int ret = 0;
>     //DIR* dir;
>     //int n;
>     //char* name;
>
>     /*
>      * We require 2.6.27 or later kernels, so we have binary-mode support.
>      * What do the device names look like?
>      * Split LINUX_USB_MON_DEV into a directory that we'll
>      * scan and a file name prefix that we'll check for.
>      */
>     pcap_strlcpy(kpnode_dev, LINUX_KPNODE_DEV, sizeof kpnode_dev);
>     kpnode_prefix = strrchr(kpnode_dev, '0');
>     if (kpnode_prefix == NULL) {
>         /*
>          * This "shouldn't happen".  Just give up if it
>          * does.
>          */
>         return 0;
>     }
>     *kpnode_prefix++ = '\0';
>     //usb_mon_prefix_len = strlen(usb_mon_prefix);
>
>     /*
>      * Open the directory and scan it.
>      */
> //    dir = opendir(usb_mon_dir);
> //    if (dir != NULL) {
> //        while ((ret == 0) && ((data = readdir(dir)) != 0)) {
> //            name = data->d_name;
> //
> //            /*
> //             * Is this a usbmon device?
> //             */
> //            if (strncmp(name, usb_mon_prefix, usb_mon_prefix_len) != 0)
> //                continue;    /* no */
> //
> //            /*
> //             * What's the device number?
> //             */
> //            if (sscanf(&name[usb_mon_prefix_len], "%d", &n) == 0)
> //                continue;    /* failed */
> //
> //            ret = kpnode_dev_add(devlistp, n, err_str);
> //        }
> //
> //        closedir(dir);
>
>     kpnode_dev_add(devlistp, 0, err_str);
>
>     return 0;
> } /* kpnode_findalldevs */
>
> pcap_t *
> kpnode_create(const char *device, char *ebuf, int *is_ours)
> {
>     const char *cp;
>     char *cpend;
>     long devnum;
>     pcap_t *p;
>
>     /* Does this look like a USB monitoring device? */
>     cp = strrchr(device, '/');
>     if (cp == NULL)
>         cp = device;
>     /* Does it begin with USB_IFACE? */
>     if (strncmp(cp, KPNODE_IFACE, sizeof KPNODE_IFACE - 1) != 0) {
>         /* Nope, doesn't begin with USB_IFACE */
>         *is_ours = 0;
>         return NULL;
>     }
>     /* Yes - is USB_IFACE followed by a number? */
>     cp += sizeof KPNODE_IFACE - 1;
>     devnum = strtol(cp, &cpend, 10);
>     if (cpend == cp || *cpend != '\0') {
>         /* Not followed by a number. */
>         *is_ours = 0;
>         return NULL;
>     }
>     if (devnum < 0) {
>         /* Followed by a non-valid number. */
>         *is_ours = 0;
>         return NULL;
>     }
>
>     /* OK, it's probably ours. */
>     *is_ours = 1;
>
>     p = PCAP_CREATE_COMMON(ebuf, struct pcap_kpnode);
>     if (p == NULL)
>         return (NULL);
>
>     //p->activate_op = usb_activate;
>     return (p);
> } /* kpnode_create */
>
> and pcap-kpnode.h
>
> int kpnode_findalldevs(pcap_if_list_t *devlistp, char *err_str);
> pcap_t *kpnode_create(const char *device, char *ebuf, int *is_ours);
>
> > > further I added into pcap.c:
> > >
> > > 100: #include "pcap-kpnode.h"
> > >
> > > 690: {kpnode_findalldevs, kpnode_create }
> > >
> > > and in Makefile.in I added my sourcefiles
> > >
> > > after that, I evoked make clean and the configure call again like that one before with all these switches. Then make 
> > > and make install. The library was successfully build, also with my changes. Then I unzipped the tcpdump archive again 
> > > to start from scratch and this time ./configure leads to that error message about no pcap_loop support. I added the 
> > > config.log as well.
>
> --- End Message ---
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