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/* hey emacs! -*- Mode: C; c-file-style: "k&r"; indent-tabs-mode: nil -*- */
/*
* options.c
* Set of functions to deal with the options structure and for parsing
* options in TFTP data buffer.
*
* $Id: options.c,v 1.16 2003/04/25 00:16:18 jp Exp $
*
* Copyright (c) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca>
* and Remi Lefebvre <remi@debian.org>
*
* 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 <unistd.h>
#include <syslog.h>
#if HAVE_ARGZ
#include <argz.h>
#else
#include "argz.h"
#endif
#include <arpa/tftp.h>
#include <string.h>
#include "options.h"
/*
* Fill a structure with the request packet of the client.
*/
int opt_parse_request(char *data, int data_size, struct tftp_opt *options)
{
char *entry = NULL;
char *tmp;
struct tftphdr *tftp_data = (struct tftphdr *)data;
size_t size = data_size - sizeof(tftp_data->th_opcode);
/* read filename */
entry = argz_next(tftp_data->th_stuff, size, entry);
if (!entry)
return ERR;
else
opt_set_options(options, "filename", entry);
/* read mode */
entry = argz_next(tftp_data->th_stuff, size, entry);
if (!entry)
return ERR;
else
opt_set_options(options, "mode", entry);
/* scan for options */
// FIXME: we should use opt_parse_options() here
while ((entry = argz_next(tftp_data->th_stuff, size, entry)))
{
tmp = entry;
entry = argz_next(tftp_data->th_stuff, size, entry);
if (!entry)
return ERR;
else
opt_set_options(options, tmp, entry);
}
return OK;
}
/*
* Fill a structure looking only at TFTP options.
*/
int opt_parse_options(char *data, int data_size, struct tftp_opt *options)
{
char *entry = NULL;
char *tmp;
struct tftphdr *tftp_data = (struct tftphdr *)data;
size_t size = data_size - sizeof(tftp_data->th_opcode);
while ((entry = argz_next(tftp_data->th_stuff, size, entry)))
{
tmp = entry;
entry = argz_next(tftp_data->th_stuff, size, entry);
if (!entry)
return ERR;
else
opt_set_options(options, tmp, entry);
}
return OK;
}
/*
* Set an option by name in the structure.
* name is the name of the option as in tftp_def.c.
* name is it's new value, that must comply with the rfc's.
* When setting an option, it is marked as specified.
*
*/
int opt_set_options(struct tftp_opt *options, char *name, char *value)
{
int i;
for (i = 0; i < OPT_NUMBER; i++)
{
if (strncasecmp(name, options[i].option, OPT_SIZE) == 0)
{
options[i].specified = 1;
if (value)
Strncpy(options[i].value, value, VAL_SIZE);
else
Strncpy(options[i].value, tftp_default_options[i].value,
VAL_SIZE);
return OK;
}
}
return ERR;
}
/*
* Return "value" for a given option name in the given option
* structure.
*/
int opt_get_options(struct tftp_opt *options, char *name, char *value)
{
int i;
for (i = 0; i < OPT_NUMBER; i++)
{
if (strncasecmp(name, options[i].option, OPT_SIZE) == 0)
{
if (options[i].enabled)
Strncpy(value, options[i].value, VAL_SIZE);
else
return ERR;
return OK;
}
}
return ERR;
}
/*
* Disable an option by name.
*/
int opt_disable_options(struct tftp_opt *options, char *name)
{
int i;
for (i = 2; i < OPT_NUMBER; i++)
{
if (name == NULL)
options[i].specified = 0;
else
{
if (strncasecmp(name, options[i].option, OPT_SIZE) == 0)
{
options[i].specified = 0;
return OK;
}
}
}
if (name == NULL)
return OK;
return ERR;
}
/*
* Return 1 if one or more options are specified in the options structure.
*/
int opt_support_options(struct tftp_opt *options)
{
int i;
int support = 0;
for (i = 2; i < OPT_NUMBER; i++)
{
if (options[i].specified)
support = 1;
}
return support;
}
/*
* The next few functions deal with TFTP options. Function's name are self
* explicative.
*/
int opt_get_tsize(struct tftp_opt *options)
{
int tsize;
if (options[OPT_TSIZE].enabled && options[OPT_TSIZE].specified)
{
tsize = atoi(options[OPT_TSIZE].value);
return tsize;
}
return ERR;
}
int opt_get_timeout(struct tftp_opt *options)
{
int timeout;
if (options[OPT_TIMEOUT].enabled && options[OPT_TIMEOUT].specified)
{
timeout = atoi(options[OPT_TIMEOUT].value);
return timeout;
}
return ERR;
}
int opt_get_blksize(struct tftp_opt *options)
{
int blksize;
if (options[OPT_BLKSIZE].enabled && options[OPT_BLKSIZE].specified)
{
blksize = atoi(options[OPT_BLKSIZE].value);
return blksize;
}
return ERR;
}
int opt_get_multicast(struct tftp_opt *options, char *addr, int *port, int *mc)
{
char *token = NULL;
char *string = NULL;
char *temp = NULL;
if (options[OPT_MULTICAST].enabled && options[OPT_MULTICAST].specified)
{
string = strdup(options[OPT_MULTICAST].value);
/* get first argument */
if ((token = strtok_r(string, ",", &temp)) == NULL)
{
free(string);
return ERR;
}
else
Strncpy(addr, token, IPADDRLEN);
/* get second argument */
if ((token = strtok_r(NULL, ",", &temp)) == NULL)
{
free(string);
return ERR;
}
else
{
*port = atoi(token);
if ((*port < 0) || (*port > 65536))
{
free(string);
return ERR;
}
}
/* get third (last) argument */
if ((token = strtok_r(NULL, ",", &temp)) == NULL)
{
free(string);
return ERR;
}
else
{
*mc = atoi(token);
if ((*mc != 0) && (*mc != 1))
{
free(string);
return ERR;
}
}
free(string);
return *mc;
}
return ERR;
}
void opt_set_tsize(int tsize, struct tftp_opt *options)
{
snprintf(options[OPT_TSIZE].value, VAL_SIZE, "%d", tsize);
}
void opt_set_timeout(int timeout, struct tftp_opt *options)
{
snprintf(options[OPT_TIMEOUT].value, VAL_SIZE, "%d", timeout);
}
void opt_set_blksize(int blksize, struct tftp_opt *options)
{
snprintf(options[OPT_BLKSIZE].value, VAL_SIZE, "%d", blksize);
}
void opt_set_multicast(struct tftp_opt *options, char *addr, int port, int mc)
{
snprintf(options[OPT_MULTICAST].value, VAL_SIZE, "%s,%d,%d", addr, port,
mc);
}
/*
* Format the content of the options structure (this is the content of a
* read or write request) to a string.
*/
void opt_request_to_string(struct tftp_opt *options, char *string, int len)
{
int i, index = 0;
for (i = 0; i < 2; i++)
{
if ((index + strlen(options[i].option) + 2) < len)
{
Strncpy(string + index, options[i].option, len - index);
index += strlen(options[i].option);
Strncpy(string + index, ": ", len - index);
index += 2;
}
if ((index + strlen(options[i].value) + 2) < len)
{
Strncpy(string + index, options[i].value, len - index);
index += strlen(options[i].value);
Strncpy(string + index, ", ", len - index);
index += 2;
}
}
opt_options_to_string(options, string + index, len - index);
}
/*
* Convert the options structure to a string.
*/
void opt_options_to_string(struct tftp_opt *options, char *string, int len)
{
int i, index = 0;
for (i = 2; i < OPT_NUMBER; i++)
{
if (options[i].specified && options[i].enabled)
{
if ((index + strlen(options[i].option) + 2) < len)
{
Strncpy(string + index, options[i].option, len - index);
index += strlen(options[i].option);
Strncpy(string + index, ": ", len - index);
index += 2;
}
if ((index + strlen(options[i].value) + 2) < len)
{
Strncpy(string + index, options[i].value, len - index);
index += strlen(options[i].value);
Strncpy(string + index, ", ", len - index);
index += 2;
}
}
}
if (index > 0)
string[index - 2] = 0;
else
string[0] = 0;
}
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