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/*--------------------------------*-C-*---------------------------------*
* File: netdisp.c
*----------------------------------------------------------------------*
* Copyright (C) 1997,1998 Oezguer Kesim <kesim@math.fu-berlin.de>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*
* Originally written:
* 1996 Chuck Blake <cblake@BBN.COM>
* Modifications:
* 1997 mj olesen <olesen@me.queensu.ca>
*----------------------------------------------------------------------*/
/*----------------------------------------------------------------------*
* support for resolving the actual IP number of the host for remote
* DISPLAYs. When the display is local (i.e. :0), we add support for
* sending the first non-loopback interface IP number as the DISPLAY
* instead of just sending the incorrect ":0". This way telnet/rlogin
* shells can actually get the correct information into DISPLAY for
* xclients.
*----------------------------------------------------------------------*/
#ifndef lint
static const char rcsid[] = "$Id: netdisp.c,v 1.1.1.1 2004/11/10 17:21:46 sasha Exp $";
#endif
#include "rxvt.h" /* NECESSARY */
/* compile an empty file if this option is disabled. */
#ifndef DISPLAY_IS_IP
/* char * network_display (const char * display) { return display; } */
#endif
#ifdef DISPLAY_IS_IP
/* On Solaris link with -lsocket and -lnsl */
#include <sys/types.h>
#include <sys/socket.h>
/* these next two are probably only on Sun (not Solaris) */
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#ifdef HAVE_SYS_BYTEORDER_H
#include <sys/byteorder.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_arp.h>
/*}}} */
/* extern functions referenced */
/* extern variables referenced */
/* extern variables declared here */
/* local variables */
/* local functions referenced */
/*----------------------------------------------------------------------*/
/* return a pointer to a static buffer */
/* PROTO */
char *
network_display(const char *display)
{
static char ipaddress[32] = "";
char buffer[1024], *rval = NULL;
struct ifconf ifc;
struct ifreq *ifr;
int i, skfd;
if (display[0] != ':' && strncmp(display, "unix:", 5))
return display; /* nothing to do */
ifc.ifc_len = sizeof(buffer); /* Get names of all ifaces */
ifc.ifc_buf = buffer;
if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
return NULL;
}
if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
perror("SIOCGIFCONF");
close(skfd);
return NULL;
}
for (i = 0, ifr = ifc.ifc_req;
i < (ifc.ifc_len / sizeof(struct ifreq));
i++, ifr++) {
struct ifreq ifr2;
STRCPY(ifr2.ifr_name, ifr->ifr_name);
if (ioctl(skfd, SIOCGIFADDR, &ifr2) >= 0) {
unsigned long addr;
struct sockaddr_in *p_addr;
p_addr = (struct sockaddr_in *)&(ifr2.ifr_addr);
addr = htonl((unsigned long)p_addr->sin_addr.s_addr);
/*
* not "0.0.0.0" or "127.0.0.1" - so format the address
*/
if (addr && addr != 0x7F000001) {
char *colon = strchr(display, ':');
if (colon == NULL)
colon = ":0.0";
sprintf(ipaddress, "%d.%d.%d.%d%s",
(int)((addr >> 030) & 0xFF),
(int)((addr >> 020) & 0xFF),
(int)((addr >> 010) & 0xFF),
(int)(addr & 0xFF), colon);
rval = ipaddress;
break;
}
}
}
close(skfd);
return rval;
}
#endif /* DISPLAY_IS_IP */
/*----------------------- end-of-file (C source) -----------------------*/
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