/*
* Retrieves a BIGNUM from the buffer.
*/
int
buffer_get_bignum_ret(Buffer *buffer, BIGNUM *value)
{
u_int bits, bytes;
u_char buf[2], *bin;
/* Get the number of bits. */
if (buffer_get_ret(buffer, (char *) buf, 2) == -1) {
error("buffer_get_bignum_ret: invalid length");
return (-1);
}
bits = get_u16(buf);
/* Compute the number of binary bytes that follow. */
bytes = (bits + 7) / 8;
if (bytes > 8 * 1024) {
error("buffer_get_bignum_ret: cannot handle BN of size %d", bytes);
return (-1);
}
if (buffer_len(buffer) < bytes) {
error("buffer_get_bignum_ret: input buffer too small");
return (-1);
}
bin = buffer_ptr(buffer);
if (BN_bin2bn(bin, bytes, value) == NULL) {
error("buffer_get_bignum_ret: BN_bin2bn failed");
return (-1);
}
if (buffer_consume_ret(buffer, bytes) == -1) {
error("buffer_get_bignum_ret: buffer_consume failed");
return (-1);
}
return (0);
}
/*
* Returns an arbitrary binary string from the buffer. The string cannot
* be longer than 256k. The returned value points to memory allocated
* with xmalloc; it is the responsibility of the calling function to free
* the data. If length_ptr is non-NULL, the length of the returned data
* will be stored there. A null character will be automatically appended
* to the returned string, and is not counted in length.
*/
void *
buffer_get_string_ret(Buffer *buffer, u_int *length_ptr)
{
u_char *value;
u_int len;
/* Get the length. */
if (buffer_get_int_ret(&len, buffer) != 0) {
error("buffer_get_string_ret: cannot extract length");
return (NULL);
}
if (len > 256 * 1024) {
error("buffer_get_string_ret: bad string length %u", len);
return (NULL);
}
/* Allocate space for the string. Add one byte for a null character. */
value = xmalloc(len + 1);
/* Get the string. */
if (buffer_get_ret(buffer, value, len) == -1) {
error("buffer_get_string_ret: buffer_get failed");
free(value);
return (NULL);
}
/* Append a null character to make processing easier. */
value[len] = '\0';
/* Optionally return the length of the string. */
if (length_ptr)
*length_ptr = len;
return (value);
}
void *buffer_get_string_ret(Buffer *buffer, unsigned int *length_ptr)
{
unsigned char *value;
unsigned int len;
/* Get the length. */
len = buffer_get_int(buffer);
if (len > 256 * 1024) {
error("buffer_get_string_ret: bad string length %u", len);
return (NULL);
}
/* Allocate space for the string. Add one byte for a null character. */
value = (unsigned char *)malloc(len + 1);
/* Get the string. */
if (buffer_get_ret(buffer, value, len) == -1) {
error("buffer_get_string_ret: buffer_get failed");
free(value);
return (NULL);
}
/* Append a null character to make processing easier. */
value[len] = 0;
/* Optionally return the length of the string. */
if (length_ptr)
*length_ptr = len;
return (value);
}
unsigned int buffer_get_int(Buffer *buffer)
{
u_char buf[4];
if (buffer_get_ret(buffer, (char *) buf, 4) == -1)
return (-1);
return get_u32(buf);
}
int buffer_get_char_ret(char *ret, Buffer *buffer)
{
if (buffer_get_ret(buffer, ret, 1) == -1) {
error("buffer_get_char_ret: buffer_get_ret failed");
return (-1);
}
return (0);
}
int
buffer_get_short_ret(u_short *ret, Buffer *buffer)
{
u_char buf[2];
if (buffer_get_ret(buffer, (char *) buf, 2) == -1)
return (-1);
*ret = get_u16(buf);
return (0);
}
int
buffer_get_int_ret(u_int *ret, Buffer *buffer)
{
u_char buf[4];
if (buffer_get_ret(buffer, (char *) buf, 4) == -1)
return (-1);
*ret = get_u32(buf);
return (0);
}
int
buffer_get_int64_ret(u_int64_t *ret, Buffer *buffer)
{
u_char buf[8];
if (buffer_get_ret(buffer, (char *) buf, 8) == -1)
return (-1);
*ret = get_u64(buf);
return (0);
}
void
buffer_get(Buffer *buffer, void *buf, u_int len)
{
if (buffer_get_ret(buffer, buf, len) == -1)
fatal("buffer_get: buffer error");
}
void
buffer_get(Buffer *buffer, void *buf, u_int len)
{
if (buffer_get_ret(buffer, buf, len) == -1)
fatal("%s: buffer error", __func__);
}
void
buffer_get(Buffer *buffer, void *buf, uint32_t len)
{
if (buffer_get_ret(buffer, buf, len) == -1)
croak("buffer_get: buffer error");
}