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wireshark/util.c

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/* util.c
* Utility routines
*
* $Id: util.c,v 1.27 2000/01/16 02:47:47 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef NEED_SNPRINTF_H
# ifdef HAVE_STDARG_H
# include <stdarg.h>
# else
# include <varargs.h>
# endif
# include "snprintf.h"
#endif
#ifdef NEED_MKSTEMP
#include "mkstemp.h"
#endif
#include "util.h"
#ifdef HAVE_IO_H
#include <io.h>
typedef int mode_t; /* for win32 */
#endif
#ifdef HAVE_LIBPCAP
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_SOCKIO_H
# include <sys/sockio.h>
#endif
#include "globals.h"
#endif
static char *
setup_tmpdir(char *dir)
{
int len = strlen(dir);
char *newdir;
/* Append slash if necessary */
if (dir[len - 1] == '/') {
newdir = dir;
}
else {
newdir = g_malloc(len + 2);
strcpy(newdir, dir);
strcat(newdir, "/");
}
return newdir;
}
static int
try_tempfile(char *namebuf, int namebuflen, const char *dir, const char *pfx)
{
static const char suffix[] = "XXXXXXXXXX";
int namelen = strlen(dir) + strlen(pfx) + sizeof suffix;
mode_t old_umask;
int tmp_fd;
if (namebuflen < namelen) {
/* Stick in a truncated name, so that if this error is
reported with the file name, you at least get
something. */
snprintf(namebuf, namebuflen, "%s%s%s", dir, pfx, suffix);
errno = ENAMETOOLONG;
return -1;
}
strcpy(namebuf, dir);
strcat(namebuf, pfx);
strcat(namebuf, suffix);
/* The Single UNIX Specification doesn't say that "mkstemp()"
creates the temporary file with mode rw-------, so we
won't assume that all UNIXes will do so; instead, we set
the umask to 0077 to take away all group and other
permissions, attempt to create the file, and then put
the umask back. */
old_umask = umask(0077);
tmp_fd = mkstemp(namebuf);
umask(old_umask);
return tmp_fd;
}
static char *tmpdir = NULL;
#ifdef WIN32
static char *temp = NULL;
#endif
static char *E_tmpdir;
#ifndef P_tmpdir
#define P_tmpdir "/var/tmp"
#endif
int
create_tempfile(char *namebuf, int namebuflen, const char *pfx)
{
char *dir;
int fd;
static gboolean initialized;
if (!initialized) {
if ((dir = getenv("TMPDIR")) != NULL)
tmpdir = setup_tmpdir(dir);
#ifdef WIN32
if ((dir = getenv("TEMP")) != NULL)
temp = setup_tmpdir(dir);
#endif
E_tmpdir = setup_tmpdir(P_tmpdir);
initialized = TRUE;
}
if (tmpdir != NULL) {
fd = try_tempfile(namebuf, namebuflen, tmpdir, pfx);
if (fd != -1)
return fd;
}
#ifdef WIN32
if (temp != NULL) {
fd = try_tempfile(namebuf, namebuflen, temp, pfx);
if (fd != -1)
return fd;
}
#endif
fd = try_tempfile(namebuf, namebuflen, E_tmpdir, pfx);
if (fd != -1)
return fd;
return try_tempfile(namebuf, namebuflen, "/tmp", pfx);
}
/* ASCII/EBCDIC conversion tables from
* http://www.room42.com/store/computer_center/code_tables.shtml
*/
static guint8 ASCII_translate_EBCDIC [ 256 ] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D,
0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8,
0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
0x7D, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88,
0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
0xA8, 0xA9, 0xC0, 0x6A, 0xD0, 0xA1, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B
};
void
ASCII_to_EBCDIC(guint8 *buf, guint bytes)
{
guint i;
guint8 *bufptr;
bufptr = buf;
for (i = 0; i < bytes; i++, bufptr++) {
*bufptr = ASCII_translate_EBCDIC[*bufptr];
}
}
guint8
ASCII_to_EBCDIC1(guint8 c)
{
return ASCII_translate_EBCDIC[c];
}
static guint8 EBCDIC_translate_ASCII [ 256 ] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
0x2E, 0x2E, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x2E, 0x3F,
0x20, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x2E, 0x2E, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
0x26, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x2E, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E,
0x2D, 0x2F, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x2E, 0x7C, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x2E, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
0x2E, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x2E, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
0x72, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x2E, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x7A, 0x2E, 0x2E, 0x2E, 0x5B, 0x2E, 0x2E,
0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x2E, 0x2E, 0x2E, 0x2E, 0x5D, 0x2E, 0x2E,
0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51,
0x52, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x5C, 0x2E, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5A, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
0x39, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E
};
void
EBCDIC_to_ASCII(guint8 *buf, guint bytes)
{
guint i;
guint8 *bufptr;
bufptr = buf;
for (i = 0; i < bytes; i++, bufptr++) {
*bufptr = EBCDIC_translate_ASCII[*bufptr];
}
}
guint8
EBCDIC_to_ASCII1(guint8 c)
{
return EBCDIC_translate_ASCII[c];
}
#ifdef HAVE_LIBPCAP
/*
* If the ability to capture packets is added to Wiretap, these
* routines should be moved to the Wiretap source (with
* "get_interface_list()" and "free_interface_list()" renamed to
* "wtap_get_interface_list()" and "wtap_free_interface_list()",
* and modified to use Wiretap routines to attempt to open the
* interface.
*/
struct search_user_data {
char *name;
int found;
};
static void
search_for_if_cb(gpointer data, gpointer user_data);
static void
free_if_cb(gpointer data, gpointer user_data);
GList *
get_interface_list(int *err, char *err_str)
{
GList *il = NULL;
gint nonloopback_pos = 0;
struct ifreq *ifr, *last;
struct ifconf ifc;
struct ifreq ifrflags;
int sock = socket(AF_INET, SOCK_DGRAM, 0);
struct search_user_data user_data;
pcap_t *pch;
if (sock < 0) {
sprintf(err_str, "Error opening socket: %s",
strerror(errno));
return NULL;
}
/*
* Since we have to grab the interface list all at once, we'll
* make plenty of room.
*/
ifc.ifc_len = 1024 * sizeof(struct ifreq);
ifc.ifc_buf = malloc(ifc.ifc_len);
if (ioctl(sock, SIOCGIFCONF, &ifc) < 0 ||
ifc.ifc_len < sizeof(struct ifreq)) {
sprintf(err_str, "SIOCGIFCONF error getting list of interfaces: %s",
strerror(errno));
goto fail;
}
ifr = (struct ifreq *) ifc.ifc_req;
last = (struct ifreq *) ((char *) ifr + ifc.ifc_len);
while (ifr < last) {
/*
* Skip addresses that begin with "dummy", or that include
* a ":" (the latter are Solaris virtuals).
*/
if (strncmp(ifr->ifr_name, "dummy", 5) == 0 ||
strchr(ifr->ifr_name, ':') != NULL)
goto next;
/*
* If we already have this interface name on the list,
* don't add it (SIOCGIFCONF returns, at least on
* BSD-flavored systems, one entry per interface *address*;
* if an interface has multiple addresses, we get multiple
* entries for it).
*/
user_data.name = ifr->ifr_name;
user_data.found = FALSE;
g_list_foreach(il, search_for_if_cb, &user_data);
if (user_data.found)
goto next;
/*
* Get the interface flags.
*/
memset(&ifrflags, 0, sizeof ifrflags);
strncpy(ifrflags.ifr_name, ifr->ifr_name,
sizeof ifrflags.ifr_name);
if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifrflags) < 0) {
if (errno == ENXIO)
goto next;
sprintf(err_str, "SIOCGIFFLAGS error getting flags for interface %s: %s",
ifr->ifr_name, strerror(errno));
goto fail;
}
/*
* Skip interfaces that aren't up.
*/
if (!(ifrflags.ifr_flags & IFF_UP))
goto next;
/*
* Skip interfaces that we can't open with "libpcap".
* Open with the minimum packet size - it appears that the
* IRIX SIOCSNOOPLEN "ioctl" may fail if the capture length
* supplied is too large, rather than just truncating it.
*/
pch = pcap_open_live(ifr->ifr_name, MIN_PACKET_SIZE, 0, 0,
err_str);
if (pch == NULL)
goto next;
pcap_close(pch);
/*
* If it's a loopback interface, add it at the end of the
* list, otherwise add it after the last non-loopback
* interface, so all loopback interfaces go at the end - we
* don't want a loopback interface to be the default capture
* device unless there are no non-loopback devices.
*/
if ((ifrflags.ifr_flags & IFF_LOOPBACK) ||
strncmp(ifr->ifr_name, "lo", 2) == 0)
il = g_list_insert(il, g_strdup(ifr->ifr_name), -1);
else {
il = g_list_insert(il, g_strdup(ifr->ifr_name),
nonloopback_pos);
/*
* Insert the next non-loopback interface after this
* one.
*/
nonloopback_pos++;
}
next:
#ifdef HAVE_SA_LEN
ifr = (struct ifreq *) ((char *) ifr + ifr->ifr_addr.sa_len + IFNAMSIZ);
#else
ifr = (struct ifreq *) ((char *) ifr + sizeof(struct ifreq));
#endif
}
free(ifc.ifc_buf);
close(sock);
if (il == NULL) {
/*
* No interfaces found.
*/
*err = NO_INTERFACES_FOUND;
}
return il;
fail:
if (il != NULL) {
g_list_foreach(il, free_if_cb, NULL);
g_list_free(il);
}
free(ifc.ifc_buf);
close(sock);
*err = CANT_GET_INTERFACE_LIST;
return NULL;
}
static void
search_for_if_cb(gpointer data, gpointer user_data)
{
struct search_user_data *search_user_data = user_data;
if (strcmp((char *)data, search_user_data->name) == 0)
search_user_data->found = TRUE;
}
static void
free_if_cb(gpointer data, gpointer user_data)
{
g_free(data);
}
void
free_interface_list(GList *if_list)
{
while (if_list != NULL) {
g_free(if_list->data);
if_list = g_list_remove_link(if_list, if_list);
}
}
#endif /* HAVE_LIBPCAP */
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