131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/*----------------------------------------------------------------------*
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* support for resolving the actual IP number of the host for remote
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* DISPLAYs. When the display is local (i.e. :0), we add support for
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* sending the first non-loopback interface IP number as the DISPLAY
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* instead of just sending the incorrect ":0". This way telnet/rlogin
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* shells can actually get the correct information into DISPLAY for
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* xclients.
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*
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* Copyright 1996 Chuck Blake <cblake@BBN.COM>
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*
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+ * Cleaned up somewhat by mj olesen <olesen@me.queensu.ca>
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+ *
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* You can do what you like with this source code as long as you don't try
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* to make money out of it and you include an unaltered copy of this
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* message (including the copyright).
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*
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* As usual, the author accepts no responsibility for anything, nor does
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* he guarantee anything whatsoever.
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*----------------------------------------------------------------------*/
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static const char cvs_ident[] = "$Id$";
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#include "config.h"
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#include "feature.h"
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#ifdef DISPLAY_IS_IP
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#ifdef HAVE_FCNTL_H
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# include <fcntl.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <sys/socket.h>
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#ifdef HAVE_SYS_SOCKIO_H
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# include <sys/sockio.h>
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#endif
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#ifdef HAVE_SYS_BYTEORDER_H
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# include <sys/byteorder.h>
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#endif
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#ifdef TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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# include <sys/ioctl.h>
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#endif
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include "startup.h"
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/* return a pointer to a static buffer */
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char *
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network_display(const char *display)
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{
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static char ipaddress[32] = "";
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char buffer[1024], *rval = NULL;
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struct ifconf ifc;
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struct ifreq *ifr;
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int i, skfd;
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if (display[0] != ':' && strncmp(display, "unix:", 5))
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return display; /* nothing to do */
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ifc.ifc_len = sizeof(buffer); /* Get names of all ifaces */
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ifc.ifc_buf = buffer;
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if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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perror("socket");
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return NULL;
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}
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if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
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perror("SIOCGIFCONF");
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close(skfd);
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return NULL;
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}
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for (i = 0, ifr = ifc.ifc_req; i < (ifc.ifc_len / sizeof(struct ifreq)); i++, ifr++) {
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struct ifreq ifr2;
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strcpy(ifr2.ifr_name, ifr->ifr_name);
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if (ioctl(skfd, SIOCGIFADDR, &ifr2) >= 0) {
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unsigned long addr;
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struct sockaddr_in *p_addr;
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p_addr = (struct sockaddr_in *) &(ifr2.ifr_addr);
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addr = htonl((unsigned long) p_addr->sin_addr.s_addr);
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/*
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* not "0.0.0.0" or "127.0.0.1" - so format the address
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*/
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if (addr && addr != 0x7F000001) {
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char *colon = strchr(display, ':');
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if (colon == NULL)
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colon = ":0.0";
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sprintf(ipaddress, "%d.%d.%d.%d%s",
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(int) ((addr >> 030) & 0xFF),
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(int) ((addr >> 020) & 0xFF),
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(int) ((addr >> 010) & 0xFF),
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(int) (addr & 0xFF), colon);
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rval = ipaddress;
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break;
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}
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}
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}
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close(skfd);
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return rval;
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}
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#endif /* DISPLAY_IS_IP */
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/*----------------------- end-of-file (C source) -----------------------*/
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