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/* $Id: interface.c 2423 2010-03-13 07:09:49Z aturner $ */
/*
* Copyright (c) 2007-2010 Aaron Turner.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright owners nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include "config.h"
#include "defines.h"
#include "common.h"
#include "interface.h"
/**
* Method takes a user specified device name and returns
* the canonical name for that device. This allows me to
* create named interface aliases on platforms like Windows
* which use horrifically long interface names
*
* Returns NULL on error
*
* On success, it *may* malloc() memory equal to the length of *alias.
*/
char *
get_interface(interface_list_t *list, const char *alias)
{
interface_list_t *ptr;
char *name;
assert(alias);
if (list != NULL) {
ptr = list;
do {
/* check both the alias & name fields */
if (strcmp(alias, ptr->alias) == 0)
return(ptr->name);
if (strcmp(alias, ptr->name) == 0)
return(ptr->name);
ptr = ptr->next;
} while (ptr != NULL);
} else {
name = (char *)safe_malloc(strlen(alias) + 1);
strlcpy(name, alias, sizeof(name));
return(name);
}
return(NULL);
}
/**
* Get all available interfaces as an interface_list *
*/
interface_list_t *
get_interface_list(void)
{
interface_list_t *list_head, *list_ptr;
char ebuf[PCAP_ERRBUF_SIZE];
pcap_if_t *pcap_if, *pcap_if_ptr;
int i = 0;
#ifndef HAVE_WIN32
/* Unix just has a warning about being root */
if (geteuid() != 0)
warn("May need to run as root to get complete list.");
#endif
if (pcap_findalldevs(&pcap_if, ebuf) < 0)
errx(-1, "Error: %s", ebuf);
pcap_if_ptr = pcap_if;
list_head = (interface_list_t *)safe_malloc(sizeof(interface_list_t));
list_ptr = list_head;
while (pcap_if_ptr != NULL) {
if (i > 0) {
list_ptr->next = (interface_list_t *)safe_malloc(sizeof(interface_list_t));
list_ptr = list_ptr->next;
}
strlcpy(list_ptr->name, pcap_if_ptr->name, sizeof(list_ptr->name));
/* description is usually null under Unix */
if (pcap_if_ptr->description != NULL)
strlcpy(list_ptr->description, pcap_if_ptr->description, sizeof(list_ptr->description));
sprintf(list_ptr->alias, "%%%d", i++);
list_ptr->flags = pcap_if_ptr->flags;
pcap_if_ptr = pcap_if_ptr->next;
}
pcap_freealldevs(pcap_if);
return(list_head);
}
/**
* Prints all the available interfaces found by get_interface_list()
*/
void
list_interfaces(interface_list_t *list)
{
interface_list_t *ptr;
if (list == NULL) {
printf("No network interfaces available");
return;
}
printf("Available network interfaces:\n");
#ifdef HAVE_WIN32 /* Win32 has alias/name/description */
printf("Alias\tName\tDescription\n");
#endif
ptr = list;
do {
if (! ptr->flags & PCAP_IF_LOOPBACK) {
#ifdef HAVE_WIN32
printf("%s\t%s\n\t%s\n", ptr->alias, ptr->name, ptr->description);
#else
printf("%s\n", ptr->name);
#endif
}
ptr = ptr->next;
} while (ptr != NULL);
}
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