sock_ntop.c 1.85 KB
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/*
 * Copyright (c) 2000-2002 University of Utah and the Flux Group.
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 * 
 * {{{EMULAB-LICENSE
 * 
 * This file is part of the Emulab network testbed software.
 * 
 * This file is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * This file 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 Affero General Public
 * License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this file.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * }}}
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 */

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/* 
 * This is a very slightly modified version of
 * example code from Unix Netwok Programming, edition 2.
 */

#include "discvr.h"

#include <net/if_dl.h>

char *
sock_ntop(const struct sockaddr *sa, socklen_t salen)
{
    char		portstr[7];
    static char str[128];		/* Unix domain is largest */

	switch (sa->sa_family) {
	case AF_INET: {
		struct sockaddr_in	*sin = (struct sockaddr_in *) sa;

		if (inet_ntop(AF_INET, &sin->sin_addr, str, sizeof(str)) == NULL)
			return(NULL);
		if (ntohs(sin->sin_port) != 0) {
			snprintf(portstr, sizeof(portstr), ".%d", ntohs(sin->sin_port));
			strcat(str, portstr);
		}
		return(str);
	}

	case AF_LINK: {
		struct sockaddr_dl	*sdl = (struct sockaddr_dl *) sa;

		if (sdl->sdl_nlen > 0)
			snprintf(str, sizeof(str), "%*s",
					 sdl->sdl_nlen, &sdl->sdl_data[0]);
		else
			snprintf(str, sizeof(str), "AF_LINK, index=%d", sdl->sdl_index);
		return(str);
	}

	default:
		snprintf(str, sizeof(str), "sock_ntop: unknown AF_xxx: %d, len %d",
				 sa->sa_family, salen);
		return(str);
	}
    return (NULL);
}