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/*----------------------------------------------------------------------*
* 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.
*
* Copyright 1996 Chuck Blake <cblake@BBN.COM>
*
+ * Cleaned up somewhat by mj olesen <olesen@me.queensu.ca>
+ *
* You can do what you like with this source code as long as you don't try
* to make money out of it and you include an unaltered copy of this
* message (including the copyright).
*
* As usual, the author accepts no responsibility for anything, nor does
* he guarantee anything whatsoever.
*----------------------------------------------------------------------*/
static const char cvs_ident[] = "$Id$";
#include "config.h"
#include "feature.h"
#ifdef DISPLAY_IS_IP
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SOCKIO_H
# include <sys/sockio.h>
#endif
#ifdef HAVE_SYS_BYTEORDER_H
# include <sys/byteorder.h>
#endif
#ifdef TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include "startup.h"
/* return a pointer to a static buffer */
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;
snprintf(ifr2.ifr_name, sizeof(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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