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/*-
* Copyright (c) 2009-2010 The FreeBSD Foundation
* Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>
* All rights reserved.
*
* This software was developed by Pawel Jakub Dawidek under sponsorship from
* the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/endian.h>
#include <errno.h>
#include <strings.h>
#include <hast.h>
#include <ebuf.h>
#include <nv.h>
#include <pjdlog.h>
#include <proto.h>
#ifdef HAVE_CRYPTO
#include "hast_checksum.h"
#endif
#include "hast_compression.h"
#include "hast_proto.h"
struct hast_main_header {
/* Protocol version. */
uint8_t version;
/* Size of nv headers. */
uint32_t size;
} __packed;
typedef int hps_send_t(const struct hast_resource *, struct nv *nv, void **,
size_t *, bool *);
typedef int hps_recv_t(const struct hast_resource *, struct nv *nv, void **,
size_t *, bool *);
struct hast_pipe_stage {
const char *hps_name;
hps_send_t *hps_send;
hps_recv_t *hps_recv;
};
static struct hast_pipe_stage pipeline[] = {
{ "compression", compression_send, compression_recv },
#ifdef HAVE_CRYPTO
{ "checksum", checksum_send, checksum_recv }
#endif
};
/*
* Send the given nv structure via conn.
* We keep headers in nv structure and pass data in separate argument.
* There can be no data at all (data is NULL then).
*/
int
hast_proto_send(const struct hast_resource *res, struct proto_conn *conn,
struct nv *nv, const void *data, size_t size)
{
struct hast_main_header hdr;
struct ebuf *eb;
bool freedata;
void *dptr, *hptr;
size_t hsize;
int ret;
dptr = (void *)(uintptr_t)data;
freedata = false;
ret = -1;
if (data != NULL) {
unsigned int ii;
for (ii = 0; ii < sizeof(pipeline) / sizeof(pipeline[0]);
ii++) {
(void)pipeline[ii].hps_send(res, nv, &dptr, &size,
&freedata);
}
nv_add_uint32(nv, size, "size");
if (nv_error(nv) != 0) {
errno = nv_error(nv);
goto end;
}
}
eb = nv_hton(nv);
if (eb == NULL)
goto end;
hdr.version = res != NULL ? res->hr_version : HAST_PROTO_VERSION;
hdr.size = htole32((uint32_t)ebuf_size(eb));
if (ebuf_add_head(eb, &hdr, sizeof(hdr)) == -1)
goto end;
hptr = ebuf_data(eb, &hsize);
if (proto_send(conn, hptr, hsize) == -1)
goto end;
if (data != NULL && proto_send(conn, dptr, size) == -1)
goto end;
ret = 0;
end:
if (freedata)
free(dptr);
return (ret);
}
int
hast_proto_recv_hdr(const struct proto_conn *conn, struct nv **nvp)
{
struct hast_main_header hdr;
struct nv *nv;
struct ebuf *eb;
void *hptr;
eb = NULL;
nv = NULL;
if (proto_recv(conn, &hdr, sizeof(hdr)) == -1)
goto fail;
if (hdr.version > HAST_PROTO_VERSION) {
errno = ERPCMISMATCH;
goto fail;
}
hdr.size = le32toh(hdr.size);
eb = ebuf_alloc(hdr.size);
if (eb == NULL)
goto fail;
if (ebuf_add_tail(eb, NULL, hdr.size) == -1)
goto fail;
hptr = ebuf_data(eb, NULL);
PJDLOG_ASSERT(hptr != NULL);
if (proto_recv(conn, hptr, hdr.size) == -1)
goto fail;
nv = nv_ntoh(eb);
if (nv == NULL)
goto fail;
*nvp = nv;
return (0);
fail:
if (eb != NULL)
ebuf_free(eb);
return (-1);
}
int
hast_proto_recv_data(const struct hast_resource *res, struct proto_conn *conn,
struct nv *nv, void *data, size_t size)
{
unsigned int ii;
bool freedata;
size_t dsize;
void *dptr;
int ret;
PJDLOG_ASSERT(data != NULL);
PJDLOG_ASSERT(size > 0);
ret = -1;
freedata = false;
dptr = data;
dsize = nv_get_uint32(nv, "size");
if (dsize > size) {
errno = EINVAL;
goto end;
} else if (dsize == 0) {
(void)nv_set_error(nv, 0);
} else {
if (proto_recv(conn, data, dsize) == -1)
goto end;
for (ii = sizeof(pipeline) / sizeof(pipeline[0]); ii > 0;
ii--) {
ret = pipeline[ii - 1].hps_recv(res, nv, &dptr,
&dsize, &freedata);
if (ret == -1)
goto end;
}
ret = -1;
if (dsize > size) {
errno = EINVAL;
goto end;
}
if (dptr != data)
bcopy(dptr, data, dsize);
}
ret = 0;
end:
if (freedata)
free(dptr);
return (ret);
}
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