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/*
* string.c - ssh string functions
*
* This file is part of the SSH Library
*
* Copyright (c) 2003-2008 by Aris Adamantiadis
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The SSH Library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SSH Library; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#include <stdlib.h>
#include <string.h>
#ifndef _WIN32
#include <arpa/inet.h>
#endif
#include "libssh/priv.h"
#include "libssh/string.h"
/** \defgroup ssh_string SSH Strings
* \brief string manipulations
*/
/** \addtogroup ssh_string
* @{ */
/**
* \brief Creates a new SSH String object
* \param size size of the string
* \return the newly allocated string
*/
struct ssh_string_struct *string_new(size_t size) {
struct ssh_string_struct *str = NULL;
str = malloc(size + 4);
if (str == NULL) {
return NULL;
}
str->size = htonl(size);
return str;
}
/**
* @brief Fill a string with given data. The string should be big enough.
*
* @param s An allocated string to fill with data.
*
* @param data The data to fill the string with.
*
* @param len Size of data.
*
* @return 0 on success, < 0 on error.
*/
int string_fill(struct ssh_string_struct *s, const void *data, size_t len) {
if ((s == NULL) || (data == NULL) ||
(len == 0) || (len > s->size)) {
return -1;
}
memcpy(s->string, data, len);
return 0;
}
/**
* \brief Creates a ssh stream using a C string
* \param what source 0-terminated C string
* \return the newly allocated string.
* \warning The nul byte is not copied nor counted in the ouput string.
*/
struct ssh_string_struct *string_from_char(const char *what) {
struct ssh_string_struct *ptr = NULL;
size_t len = strlen(what);
ptr = malloc(4 + len);
if (ptr == NULL) {
return NULL;
}
ptr->size = htonl(len);
memcpy(ptr->string, what, len);
return ptr;
}
/**
* \brief returns the size of a SSH string
* \param s the input SSH string
* \return size of the content of str, 0 on error
*/
size_t string_len(struct ssh_string_struct *s) {
if (s == NULL) {
return ntohl(0);
}
return ntohl(s->size);
}
/**
* \brief convert a SSH string to a C nul-terminated string
* \param s the input SSH string
* \return a malloc'ed string pointer.
* \warning If the input SSH string contains zeroes, some parts of
* the output string may not be readable with regular libc functions.
*/
char *string_to_char(struct ssh_string_struct *s) {
size_t len = ntohl(s->size) + 1;
char *new = malloc(len);
if (new == NULL) {
return NULL;
}
memcpy(new, s->string, len - 1);
new[len - 1] = '\0';
return new;
}
/**
* @brief Copy a string, return a newly allocated string. The caller has to
* free the string.
*
* @param s String to copy.
*
* @return Newly allocated copy of the string, NULL on error.
*/
struct ssh_string_struct *string_copy(struct ssh_string_struct *s) {
struct ssh_string_struct *new = malloc(ntohl(s->size) + 4);
if (new == NULL) {
return NULL;
}
new->size = s->size;
memcpy(new->string, s->string, ntohl(s->size));
return new;
}
/** \brief destroy data in a string so it couldn't appear in a core dump
* \param s string to burn
*/
void string_burn(struct ssh_string_struct *s) {
if (s == NULL) {
return;
}
memset(s->string, 'X', string_len(s));
}
/**
* @brief Get the payload of the string.
*
* @param s The string to get the data from.
*
* @return Return the data of the string or NULL on error.
*/
void *string_data(struct ssh_string_struct *s) {
if (s == NULL) {
return NULL;
}
return s->string;
}
/**
* \brief deallocate a STRING object
* \param s String to delete
*/
void string_free(struct ssh_string_struct *s) {
SAFE_FREE(s);
}
/** @} */
/* vim: set ts=2 sw=2 et cindent: */
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