proto.c

/* SPDX-License-Identifier: MIT */
/*
 * Copyright (c) 2005-2014 Rich Felker, et al.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include <sys/socket.h>
#include <netdb.h>
#include <string.h>

/* do we really need all these?? */

static size_t idx;
static const unsigned char protos[] = {
	"\000ip\0"
	"\001icmp\0"
	"\002igmp\0"
	"\003ggp\0"
	"\004ipencap\0"
	"\005st\0"
	"\006tcp\0"
	"\010egp\0"
	"\014pup\0"
	"\021udp\0"
	"\024hmp\0"
	"\026xns-idp\0"
	"\033rdp\0"
	"\035iso-tp4\0"
	"\044xtp\0"
	"\045ddp\0"
	"\046idpr-cmtp\0"
	"\051ipv6\0"
	"\053ipv6-route\0"
	"\054ipv6-frag\0"
	"\055idrp\0"
	"\056rsvp\0"
	"\057gre\0"
	"\062esp\0"
	"\063ah\0"
	"\071skip\0"
	"\072ipv6-icmp\0"
	"\073ipv6-nonxt\0"
	"\074ipv6-opts\0"
	"\111rspf\0"
	"\121vmtp\0"
	"\131ospf\0"
	"\136ipip\0"
	"\142encap\0"
	"\147pim\0"
	"\377raw"
};

void endprotoent(void)
{
	idx = 0;
}

void setprotoent(int stayopen)
{
	idx = 0;
}

struct protoent *getprotoent(void)
{
	static struct protoent p;
	static const char *aliases;

	if (idx >= sizeof(protos))
		return NULL;
	p.p_proto = protos[idx];
	p.p_name = (char *)&protos[idx+1];
	p.p_aliases = (char **)&aliases;
	idx += strlen(p.p_name) + 2;
	return &p;
}

struct protoent *getprotobyname(const char *name)
{
	struct protoent *p;

	endprotoent();
	do p = getprotoent();
	while (p && strcmp(name, p->p_name));
	return p;
}

struct protoent *getprotobynumber(int num)
{
	struct protoent *p;

	endprotoent();
	do p = getprotoent();
	while (p && p->p_proto != num);
	return p;
}