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tftpd_mcast.c
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tftpd_mcast.c
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/* hey emacs! -*- Mode: C; c-file-style: "k&r"; indent-tabs-mode: nil -*- */
/*
* tftpd_mcast.c
* support routine for multicast server
*
* $Id: tftpd_mcast.c,v 1.6 2003/04/25 00:16:19 jp Exp $
*
* Copyright (c) 2000 Jean-Pierre Lefebvre <[email protected]>
* and Remi Lefebvre <[email protected]>
*
* atftp is free software; you can redistribute them and/or modify them
* 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.
*
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "tftpd.h"
#include "tftp_def.h"
#include "logger.h"
#define START 0
#define GET_ENUM 1
#define GET_GRP 2
#define EXPAND 3
pthread_mutex_t mcast_tid_list = PTHREAD_MUTEX_INITIALIZER;
int parse_ip(char *string, char **res_ip);
int parse_port(char *string, char **res_port);
struct tid {
char *addr;
short port;
int used;
struct tid *next;
};
struct tid *tid_list = NULL;
/*
* Return a free IP/Port for the multicast transfer
*/
int tftpd_mcast_get_tid(char **addr, short *port)
{
struct tid *current = tid_list;
pthread_mutex_lock(&mcast_tid_list);
/* walk the list for a free tid */
while (current != NULL)
{
if (current->used == 0)
{
*addr = current->addr;
*port = current->port;
current->used = 1;
pthread_mutex_unlock(&mcast_tid_list);
return OK;
}
else
current = current->next;
}
pthread_mutex_unlock(&mcast_tid_list);
return ERR;
}
int tftpd_mcast_free_tid(char *addr, short port)
{
struct tid *current = tid_list;
pthread_mutex_lock(&mcast_tid_list);
while (current != NULL)
{
if ((current->used == 1) && (current->port == port) &&
(strcmp(current->addr, addr) == 0))
{
current->used = 0;
pthread_mutex_unlock(&mcast_tid_list);
return OK;
}
else
current = current->next;
}
pthread_mutex_unlock(&mcast_tid_list);
return ERR;
}
/* valid address specification:
239.255.0.0-239.255.0.20
239.255.0.0-20
239.255.0.0,1,2,3,8,10
*/
/* valid port specification
1758
1758-1780
1758,1760,4000
*/
int tftpd_mcast_parse_opt(char *addr, char *ports)
{
char *ip;
char *port;
struct tid *current = NULL;
struct tid *tmp = NULL;
while (1)
{
if (parse_ip(addr, &ip) != OK)
return ERR;
if (ip == NULL)
return OK;
while (1)
{
if (parse_port(ports, &port) != OK)
return ERR;
if (port == NULL)
break;
/* add this ip/port to the tid list */
tmp = malloc(sizeof(struct tid));
tmp->addr = strdup(ip);
tmp->port = (short)atoi(port);
tmp->used = 0;
tmp->next = NULL;
if (tid_list == NULL)
{
tid_list = tmp;
current = tid_list;
}
else
{
current->next = tmp;
current = tmp;
}
}
}
}
void tftpd_mcast_clean(void)
{
}
int parse_ip(char *string, char **res_ip)
{
static int state = START;
static char s[MAXLEN];
static char *saveptr;
static char s2[MAXLEN];
static char *saveptr2;
static int ip[4];
static int tmp_ip[4];
static int i;
int res;
char *tmp = NULL, *tmp2 = NULL;
static char out[MAXLEN];
*res_ip = NULL;
while (1)
{
switch (state)
{
case START:
Strncpy(s, string, MAXLEN);
tmp = strtok_r(s, ",", &saveptr);
if (tmp == NULL)
{
state = START;
return ERR;
}
else
state = GET_GRP;
break;
case GET_ENUM:
tmp = strtok_r(NULL, ",", &saveptr);
if (tmp == NULL)
{
state = START;
return OK;
}
else
state = GET_GRP;
break;
case GET_GRP:
Strncpy(s2, tmp, MAXLEN);
tmp = strtok_r(s2, "-", &saveptr2);
if (tmp == NULL)
{
state = START;
return ERR;
}
res = sscanf(tmp, "%d.%d.%d.%d", &tmp_ip[0], &tmp_ip[1],
&tmp_ip[2], &tmp_ip[3]);
if (res == 4)
{
for (i=0; i < 4; i++)
ip[i] = tmp_ip[i];
}
else
{
if (res == 1)
{
ip[3] = tmp_ip[0];
}
else
{
state = START;
return ERR;
}
}
tmp2 = strtok_r(NULL, "-", &saveptr2);
if (tmp2 == NULL)
{
state = GET_ENUM;
snprintf(out, sizeof(out), "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
*res_ip = out;
return OK;
}
else
{
sscanf(tmp2, "%d", &tmp_ip[0]);
i = ip[3];
if (i >= tmp_ip[0])
{
logger(LOG_ERR, "Bad address range: %d.%d.%d.%d-%d",
ip[0], ip[1], ip[2], ip[3], tmp_ip[0]);
return ERR;
}
state = EXPAND;
}
break;
case EXPAND:
if (i > tmp_ip[0])
{
state = GET_ENUM;
break;
}
snprintf(out, sizeof(out), "%d.%d.%d.%d", ip[0], ip[1], ip[2], i);
i++;
*res_ip = out;
return OK;
break;
}
}
}
int parse_port(char *string, char **res_port)
{
static int state = START;
static char s[MAXLEN];
static char *saveptr;
static char s2[MAXLEN];
static char *saveptr2;
static int port;
static int tmp_port;
static int i;
int res;
char *tmp = NULL, *tmp2 = NULL;
static char out[MAXLEN];
*res_port = NULL;
while (1)
{
switch (state)
{
case START:
Strncpy(s, string, MAXLEN);
tmp = strtok_r(s, ",", &saveptr);
if (tmp == NULL)
{
state = START;
return ERR;
}
else
state = GET_GRP;
break;
case GET_ENUM:
tmp = strtok_r(NULL, ",", &saveptr);
if (tmp == NULL)
{
state = START;
return OK;
}
else
state = GET_GRP;
break;
case GET_GRP:
Strncpy(s2, tmp, MAXLEN);
tmp = strtok_r(s2, "-", &saveptr2);
if (tmp == NULL)
{
state = START;
return ERR;
}
res = sscanf(tmp, "%d", &port);
if (res != 1)
{
state = START;
return ERR;
}
tmp2 = strtok_r(NULL, "-", &saveptr2);
if (tmp2 == NULL)
{
state = GET_ENUM;
snprintf(out, sizeof(out), "%d", port);
*res_port = out;
return OK;
}
else
{
sscanf(tmp2, "%d", &tmp_port);
i = port;
if (i >= tmp_port)
{
logger(LOG_ERR, "Bad port range: %d-%d", i, tmp_port);
return ERR;
}
state = EXPAND;
}
break;
case EXPAND:
if (i > tmp_port)
{
state = GET_ENUM;
break;
}
snprintf(out, sizeof(out), "%d", i);
i++;
*res_port = out;
return OK;
break;
}
}
}