sock_ntop_host.c

SocketApi是在netembryo库上修改而成的

/* * 
 *  $Id$
 *  
 *  This file is part of NetEmbryo 
 *
 * NetEmbryo -- default network wrapper 
 *
 *  Copyright (C) 2005 by
 *  	
 *	- Federico Ridolfo	<[e-mail]>
 * 
 *  NetEmbryo 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.
 *
 *  NetEmbryo 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 NetEmbryo; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * this piece of code is taken from NeMeSI
 * */

#include <wsocket.h>

#ifdef HAVE_SOCKADDR_DL_STRUCT
#include <net/if_dl.h>
#endif
#ifdef AF_UNIX
#include <sys/un.h>
#endif

const char *sock_ntop_host(const struct sockaddr *sa, char *str, size_t len)
{
	switch (sa->sa_family) {
	case AF_INET: {
		struct sockaddr_in	*sin = (struct sockaddr_in *) sa;
		return(inet_ntop(AF_INET, &(sin->sin_addr), str, len));
	}

#ifdef	IPV6
	case AF_INET6: {
		struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) sa;
		int a = 0;
		char *tmp = str;
		const char *retval = inet_ntop(AF_INET6, &(sin6->sin6_addr), str, len);
		if (retval) {
			while ((tmp = strchr(tmp, '.'))) {
				a++;
				tmp++;
			}
			if (a == 3) {
				if (!strncmp(str, "::ffff:", 7)) {
					//this is an IPv4 address mapped in IPv6 address space
					memmove (str, &str[7], strlen(str) - 6); // one char more for trailing NUL char
				} else {
					//this is an IPv6 address containg an IPv4 address (like ::127.0.0.1)
					memmove (str, &str[2], strlen(str) - 1);
				}
			}
		}
		return retval;
	}
#endif

#ifdef	AF_UNIX
	case AF_UNIX: {
		struct sockaddr_un *unp = (struct sockaddr_un *) sa;

			/* OK to have no pathname bound to the socket: happens on
			   every connect() unless client calls bind() first. */
		if (unp->sun_path[0] == '\0')
			strncpy(str, "(no pathname bound)", len);
		else
			strncpy(str, unp->sun_path, len);
		return(str);
	}
#endif

#ifdef	HAVE_SOCKADDR_DL_STRUCT
	case AF_LINK: {
		struct sockaddr_dl *sdl = (struct sockaddr_dl *) sa;
		/*if (sdl->sdl_nlen > 0)
			snprintf(str, len, "%*s",
					 sdl->sdl_nlen, &sdl->sdl_data[0]);
		else
			snprintf(str, len, "AF_LINK, index=%d", sdl->sdl_index);*/
		return(str);
	}
#endif
	default:
		break;
	}
    return (NULL);
}