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/cvs/rxvt-unicode/src/netdisp.C
Revision: 1.2
Committed: Mon Nov 24 17:31:27 2003 UTC (20 years, 6 months ago) by pcg
Content type: text/plain
Branch: MAIN
CVS Tags: rel-1-3, rel-1-2
Changes since 1.1: +0 -0 lines
Log Message:
*** empty log message ***

File Contents

# User Rev Content
1 pcg 1.1 /*--------------------------------*-C-*---------------------------------*
2     * File: netdisp.c
3     *----------------------------------------------------------------------*
4     * $Id: netdisp.C,v 1.1 2003/11/18 14:22:17 root Exp $
5     *
6     * All portions of code are copyright by their respective author/s.
7     * Copyright (c) 1996 Chuck Blake <cblake@BBN.COM>
8     * - original version
9     * Copyright (c) 1997 mj olesen <olesen@me.queensu.ca>
10     * Copyright (c) 1997,1998 Oezguer Kesim <kesim@math.fu-berlin.de>
11     *
12     * This program is free software; you can redistribute it and/or modify
13     * it under the terms of the GNU General Public License as published by
14     * the Free Software Foundation; either version 2 of the License, or
15     * (at your option) any later version.
16     *
17     * This program is distributed in the hope that it will be useful,
18     * but WITHOUT ANY WARRANTY; without even the implied warranty of
19     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20     * GNU General Public License for more details.
21     *
22     * You should have received a copy of the GNU General Public License
23     * along with this program; if not, write to the Free Software
24     * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25     *----------------------------------------------------------------------*/
26     /*----------------------------------------------------------------------*
27     * support for resolving the actual IP number of the host for remote
28     * DISPLAYs. When the display is local (i.e. :0), we add support for
29     * sending the first non-loopback interface IP number as the DISPLAY
30     * instead of just sending the incorrect ":0". This way telnet/rlogin
31     * shells can actually get the correct information into DISPLAY for
32     * xclients.
33     *----------------------------------------------------------------------*/
34    
35     #include "../config.h" /* NECESSARY */
36     #include "rxvt.h" /* NECESSARY */
37    
38     #ifdef DISPLAY_IS_IP
39     #include "netdisp.h"
40    
41     /*----------------------------------------------------------------------*/
42     /* return NULL a pointer to buffer which may be freed */
43     /* EXTPROTO */
44     char *
45     rxvt_network_display(const char *display)
46     {
47     char buffer[1024], *rval = NULL;
48     struct ifconf ifc;
49     struct ifreq *ifr;
50     int i, skfd;
51    
52     if (display[0] != ':' && STRNCMP(display, "unix:", 5))
53     return (char *) display; /* nothing to do */
54    
55     ifc.ifc_len = sizeof(buffer); /* Get names of all ifaces */
56     ifc.ifc_buf = buffer;
57    
58     if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
59     perror("socket");
60     return NULL;
61     }
62     if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
63     perror("SIOCGIFCONF");
64     close(skfd);
65     return NULL;
66     }
67     for (i = 0, ifr = ifc.ifc_req;
68     i < (ifc.ifc_len / sizeof(struct ifreq));
69     i++, ifr++) {
70     struct ifreq ifr2;
71    
72     STRCPY(ifr2.ifr_name, ifr->ifr_name);
73     if (ioctl(skfd, SIOCGIFADDR, &ifr2) >= 0) {
74     unsigned long addr;
75     struct sockaddr_in *p_addr;
76    
77     p_addr = (struct sockaddr_in *)&(ifr2.ifr_addr);
78     addr = htonl((unsigned long)p_addr->sin_addr.s_addr);
79    
80     /*
81     * not "0.0.0.0" or "127.0.0.1" - so format the address
82     */
83     if (addr && addr != 0x7F000001) {
84     char *colon = STRCHR(display, ':');
85    
86     if (colon == NULL)
87     colon = ":0.0";
88    
89     rval = rxvt_malloc(STRLEN(colon) + 16);
90     sprintf(rval, "%d.%d.%d.%d%s",
91     (int)((addr >> 030) & 0xFF),
92     (int)((addr >> 020) & 0xFF),
93     (int)((addr >> 010) & 0xFF),
94     (int)(addr & 0xFF), colon);
95     break;
96     }
97     }
98     }
99    
100     close(skfd);
101     return rval;
102     }
103     #endif /* DISPLAY_IS_IP */
104     /*----------------------- end-of-file (C source) -----------------------*/