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/*
* conversion from protocol/port string to protocol and port
* Copyright (C) 2002 Mario Strasser <mast@gmx.net>,
* Zuercher Hochschule Winterthur,
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*
* RCSID $Id: ttoprotoport.c,v 1.1 2004/03/15 20:35:26 as Exp $
*/
#include "internal.h"
#include "freeswan.h"
/*
* ttoprotoport - converts from protocol/port string to protocol and port
*/
err_t
ttoprotoport(src, src_len, proto, port, has_port_wildcard)
char *src; /* input string */
size_t src_len; /* length of input string, use strlen() if 0 */
u_int8_t *proto; /* extracted protocol number */
u_int16_t *port; /* extracted port number if it exists */
int *has_port_wildcard; /* set if port is %any */
{
char *end, *service_name;
char proto_name[16];
int proto_len;
long int l;
struct protoent *protocol;
struct servent *service;
/* get the length of the string */
if (!src_len) src_len = strlen(src);
/* locate delimiter '/' between protocol and port */
end = strchr(src, '/');
if (end != NULL) {
proto_len = end - src;
service_name = end + 1;
} else {
proto_len = src_len;
service_name = src + src_len;
}
/* copy protocol name*/
memset(proto_name, '\0', sizeof(proto_name));
memcpy(proto_name, src, proto_len);
/* extract protocol by trying to resolve it by name */
protocol = getprotobyname(proto_name);
if (protocol != NULL) {
*proto = protocol->p_proto;
}
else /* failed, now try it by number */
{
l = strtol(proto_name, &end, 0);
if (*proto_name && *end)
return "<protocol> is neither a number nor a valid name";
if (l < 0 || l > 0xff)
return "<protocol> must be between 0 and 255";
*proto = (u_int8_t)l;
}
/* is there a port wildcard? */
*has_port_wildcard = (strcmp(service_name, "%any") == 0);
if (*has_port_wildcard)
{
*port = 0;
return NULL;
}
/* extract port by trying to resolve it by name */
service = getservbyname(service_name, NULL);
if (service != NULL) {
*port = ntohs(service->s_port);
}
else /* failed, now try it by number */
{
l = strtol(service_name, &end, 0);
if (*service_name && *end)
return "<port> is neither a number nor a valid name";
if (l < 0 || l > 0xffff)
return "<port> must be between 0 and 65535";
*port = (u_int16_t)l;
}
return NULL;
}
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