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/*
*****************************************************************************
*
* File: fko_message.c
*
* Author: Damien S. Stuart
*
* Purpose: Set/Get the spa message (access req/command/etc) based
* on the current spa data.
*
* Copyright 2009-2010 Damien Stuart (dstuart@dstuart.org)
*
* License (GNU Public License):
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*****************************************************************************
*/
#include "fko_common.h"
#include "fko.h"
/* SPA message format validation functions.
* (These called from the spa_message function here only).
*/
int validate_cmd_msg(const char *msg);
int validate_access_msg(const char *msg);
int validate_proto_port_spec(const char *msg);
int validate_nat_access_msg(const char *msg);
int got_allow_ip(const char *msg);
/* Set the SPA message type.
*/
int
fko_set_spa_message_type(fko_ctx_t ctx, const short msg_type)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return FKO_ERROR_CTX_NOT_INITIALIZED;
if(msg_type < 0 || msg_type >= FKO_LAST_MSG_TYPE)
return(FKO_ERROR_INVALID_DATA);
ctx->message_type = msg_type;
ctx->state |= FKO_SPA_MSG_TYPE_MODIFIED;
return(FKO_SUCCESS);
}
/* Return the SPA message type.
*/
int
fko_get_spa_message_type(fko_ctx_t ctx, short *msg_type)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return FKO_ERROR_CTX_NOT_INITIALIZED;
*msg_type = ctx->message_type;
return(FKO_SUCCESS);
}
/* Set the SPA MESSAGE data
*/
int
fko_set_spa_message(fko_ctx_t ctx, const char *msg)
{
int res = FKO_ERROR_UNKNOWN;
/* Context must be initialized.
*/
if(!CTX_INITIALIZED(ctx))
return FKO_ERROR_CTX_NOT_INITIALIZED;
/* Gotta have a valid string.
*/
if(msg == NULL || strlen(msg) == 0)
return(FKO_ERROR_INVALID_DATA);
/* --DSS XXX: Bail out for now. But consider just
* truncating in the future...
*/
if(strlen(msg) > MAX_SPA_MESSAGE_SIZE)
return(FKO_ERROR_DATA_TOO_LARGE);
/* Basic message type and format checking...
*/
switch(ctx->message_type)
{
case FKO_COMMAND_MSG:
res = validate_cmd_msg(msg);
break;
case FKO_ACCESS_MSG:
case FKO_CLIENT_TIMEOUT_ACCESS_MSG:
res = validate_access_msg(msg);
break;
case FKO_NAT_ACCESS_MSG:
case FKO_LOCAL_NAT_ACCESS_MSG:
case FKO_CLIENT_TIMEOUT_NAT_ACCESS_MSG:
case FKO_CLIENT_TIMEOUT_LOCAL_NAT_ACCESS_MSG:
res = validate_nat_access_msg(msg);
break;
}
if(res != FKO_SUCCESS)
return(res);
/* Just in case this is a subsquent call to this function. We
* do not want to be leaking memory.
*/
if(ctx->message != NULL)
free(ctx->message);
ctx->message = strdup(msg);
ctx->state |= FKO_DATA_MODIFIED;
if(ctx->message == NULL)
return(FKO_ERROR_MEMORY_ALLOCATION);
return(FKO_SUCCESS);
}
/* Return the SPA message data.
*/
int
fko_get_spa_message(fko_ctx_t ctx, char **msg)
{
/* Must be initialized
*/
if(!CTX_INITIALIZED(ctx))
return(FKO_ERROR_CTX_NOT_INITIALIZED);
*msg = ctx->message;
return(FKO_SUCCESS);
}
/* Validate a command message format.
*/
int
validate_cmd_msg(const char *msg)
{
const char *ndx;
int res = FKO_SUCCESS;
int startlen = strlen(msg);
/* Should have a valid allow IP.
*/
if((res = got_allow_ip(msg)) != FKO_SUCCESS)
return(res);
/* Commands are fairly free-form so all we can really verify is
* there is something at all. Get past the IP and comma, and make
* sure we have some string leftover...
*/
ndx = strchr(msg, ',');
if(ndx == NULL || (1+(ndx - msg)) >= startlen)
return(FKO_ERROR_INVALID_SPA_COMMAND_MSG);
return(FKO_SUCCESS);
}
int
validate_access_msg(const char *msg)
{
const char *ndx;
int res = FKO_SUCCESS;
int startlen = strlen(msg);
/* Should have a valid allow IP.
*/
if((res = got_allow_ip(msg)) != FKO_SUCCESS)
return(res);
/* Position ourselves beyond the allow IP and make sure we are
* still good.
*/
ndx = strchr(msg, ',');
if(ndx == NULL || (1+(ndx - msg)) >= startlen)
return(FKO_ERROR_INVALID_SPA_ACCESS_MSG);
/* Look for a comma to see if this is a multi-part access request.
*/
do {
ndx++;
res = validate_proto_port_spec(ndx);
} while((ndx = strchr(ndx, ',')));
return(res);
}
int
validate_proto_port_spec(const char *msg)
{
int startlen = strlen(msg);
const char *ndx = msg;
/* Now check for proto/port string. Currenly we only allow protos
* 'tcp', 'udp', and 'icmp'.
*/
if(strncmp(ndx, "tcp", 3)
&& strncmp(ndx, "udp", 3)
&& strncmp(ndx, "icmp", 4)
&& strncmp(ndx, "none", 4))
return(FKO_ERROR_INVALID_SPA_ACCESS_MSG);
ndx = strchr(ndx, '/');
if(ndx == NULL || (1+(ndx - msg)) >= startlen)
return(FKO_ERROR_INVALID_SPA_ACCESS_MSG);
/* Skip over the ',' and make sure we only have digits.
*/
ndx++;
while(*ndx != '\0')
{
if(isdigit(*ndx) == 0)
return(FKO_ERROR_INVALID_SPA_ACCESS_MSG);
ndx++;
}
return(FKO_SUCCESS);
}
int
validate_nat_access_msg(const char *msg)
{
int res = FKO_SUCCESS;
/* Should have a valid access message.
*/
if((res = validate_access_msg(msg)) != FKO_SUCCESS)
return(res);
// --DSS TODO: XXX: Put nat_access validation code here
return(FKO_SUCCESS);
}
int
got_allow_ip(const char *msg)
{
const char *ndx = msg;
int dot_cnt = 0;
int res = FKO_SUCCESS;
while(*ndx != ',' && *ndx != '\0')
{
if(*ndx == '.')
dot_cnt++;
else if(isdigit(*ndx) == 0)
{
res = FKO_ERROR_INVALID_ALLOW_IP;
break;
}
ndx++;
}
if(dot_cnt != 3)
res = FKO_ERROR_INVALID_ALLOW_IP;
return(res);
}
/***EOF***/
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