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/* IPSec VPN client compatible with Cisco equipment.
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 <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
#include <unistd.h>
#include <errno.h>
#include "sysdep.h"
#include "crypto.h"
#define MSG_SIZE 200
void crypto_error_set(crypto_error **error,
int code,
int in_errno,
const char *fmt, ...)
{
va_list args;
if (!error)
return;
if (*error) {
fprintf(stderr, "%s: called with non-NULL *error\n", __func__);
return;
}
*error = calloc(1, sizeof(crypto_error));
if (!*error)
return;
(*error)->code = code;
(*error)->err = in_errno;
(*error)->msg = malloc(MSG_SIZE);
if (!(*error)->msg) {
fprintf(stderr, "%s: not enough memory for error message\n", __func__);
crypto_error_clear(error);
return;
}
va_start(args, fmt);
if (vsnprintf((*error)->msg, MSG_SIZE, fmt, args) == -1)
(*error)->msg[0] = '\0';
va_end(args);
}
void crypto_error_free(crypto_error *error)
{
if (error) {
if (error->msg)
free(error->msg);
memset(error, 0, sizeof(crypto_error));
free(error);
}
}
void crypto_error_clear(crypto_error **error)
{
if (error && *error) {
crypto_error_free(*error);
*error = NULL;
}
}
void crypto_call_error(crypto_error *err)
{
if (err)
error(err->code, err->err, "%s\n", err->msg);
else
error(1, 0, "unknown error");
}
unsigned char *
crypto_read_file(const char *path, size_t *out_len, crypto_error **error)
{
struct stat st;
int fd;
ssize_t bytes_read;
size_t file_size;
unsigned char *data = NULL;
*out_len = 0;
fd = open(path, O_RDONLY);
if (fd < 0) {
crypto_error_set(error, 1, errno, "failed to open file '%s'", path);
return NULL;
}
if (fstat(fd, &st) < 0) {
crypto_error_set(error, 1, errno, "failed to stat file '%s'", path);
goto out;
}
if (st.st_size <= 0 || st.st_size > INT_MAX) {
crypto_error_set(error, 1, errno, "invalid file '%s' length %ld", path, st.st_size);
goto out;
}
file_size = st.st_size;
data = malloc(file_size);
if (!data) {
crypto_error_set(error, 1, ENOMEM, "not enough memory to read file '%s'", path);
goto out;
}
do {
bytes_read = read(fd, &(data[*out_len]), (st.st_size - *out_len));
if (bytes_read < 0) {
free(data);
data = NULL;
*out_len = 0;
crypto_error_set(error, 1, errno, "failed to read file '%s'", path);
goto out;
}
*out_len += bytes_read;
} while ((bytes_read > 0) && (*out_len <= file_size));
out:
close(fd);
return data;
}
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