netdisp.c

Mrxvt是一个小巧

/*--------------------------------*-C-*---------------------------------*
 * File:	netdisp.c
 *----------------------------------------------------------------------*
 *
 * All portions of code are copyright by their respective author/s.
 * Copyright (c) 1996        Chuck Blake <[e-mail]>
 * Copyright (c) 1996        mj olesen <[e-mail]>
 * Copyright (c) 1997,1998   Oezguer Kesim <[e-mail]>
 * Copyright (c) 2004        Jingmin Zhou <[e-mail]>
 *
 * 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.
 *----------------------------------------------------------------------*/

#include "../config.h"
#include "rxvt.h"


#ifdef DEBUG_VERBOSE
#define DEBUG_LEVEL 1
#else 
#define DEBUG_LEVEL 0
#endif

#if DEBUG_LEVEL
#define DBG_MSG(d,x) if(d <= DEBUG_LEVEL) fprintf x
#else
#define DBG_MSG(d,x)
#endif


#ifdef DISPLAY_IS_IP

/*----------------------------------------------------------------------*/
/* return NULL a pointer to buffer which may be freed */
/* EXTPROTO */
char*
rxvt_network_display (const char *display)
{
    char            buffer[1024], *rval = NULL;
    struct ifconf   ifc;
    struct ifreq   *ifr;
    int             i, skfd;

    if (display[0] != ':' && STRNCMP(display, "unix:", 5))
		return (char *) 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) {
				int			l;
				char*		colon = STRCHR(display, ':');

				if (colon == NULL)
				    colon = ":0.0";

				/* possible integer overflow */
				l = 16 + STRLEN(colon);
				if (l <= 0 || l > 1024)
					l = 1024;

				rval = rxvt_malloc(l);
				snprintf(rval, "%d.%d.%d.%d%s", l-1
					(int)((addr >> 030) & 0xFF),
					(int)((addr >> 020) & 0xFF),
					(int)((addr >> 010) & 0xFF),
					(int)(addr & 0xFF), colon);
				rval[l-1] = (char) 0;
				break;
		    }
		}
    }

    close(skfd);
    return rval;
}
#endif				/* DISPLAY_IS_IP */
/*----------------------- end-of-file (C source) -----------------------*/