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/* Copyright 2019 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include "buffer.h"
#include "instruction.h"
#include "libcronus_private.h"
int cronus_request(struct cronus_context *cctx,
uint32_t key, uint32_t out_len,
struct cronus_buffer *request,
struct cronus_buffer *reply)
{
uint8_t *buf, *ptr;
size_t len = 0, buflen;
ssize_t n;
int ret;
assert(cctx);
assert(cctx->fd != -1);
ptr = cbuf_finish(request, &len);
assert(len > 0);
buflen = 1024 + out_len;
buf = malloc(buflen);
if (!buf)
return ENOMEM;
n = write(cctx->fd, ptr, len);
if (n == -1) {
free(buf);
ret = errno;
perror("write");
return ret;
}
if (n != len) {
free(buf);
fprintf(stderr, "Short write (%zu of %zu) to server\n", n, len);
return EIO;
}
n = read(cctx->fd, buf, buflen);
if (n == -1) {
free(buf);
ret = errno;
perror("read");
return ret;
}
ret = cbuf_new_from_buf(reply, buf, n);
free(buf);
if (ret)
return ret;
return 0;
}
static int cronus_parse_ecmd_dbuf(struct cronus_buffer *cbuf,
uint32_t size,
struct cronus_reply *reply)
{
reply->data = malloc(size);
if (!reply->data)
return ENOMEM;
reply->data_len = size;
cbuf_read(cbuf, reply->data, reply->data_len);
return 0;
}
static int cronus_parse_instruction_status(struct cronus_buffer *cbuf,
uint32_t size,
struct cronus_reply *reply)
{
uint32_t offset;
if (size < 4 * sizeof(uint32_t))
return EPROTO;
cbuf_read_uint32(cbuf, &reply->status_version);
cbuf_read_uint32(cbuf, &reply->instruction_version);
cbuf_read_uint32(cbuf, &reply->rc);
cbuf_read_uint32(cbuf, &reply->status_len);
offset = 4 * sizeof(uint32_t);
if (size < offset + reply->status_len)
return EPROTO;
reply->status = malloc(reply->status_len);
if (!reply->status)
return ENOMEM;
cbuf_read(cbuf, reply->status, reply->status_len);
return 0;
}
int cronus_parse_reply(uint32_t key,
struct cronus_buffer *cbuf,
struct cronus_reply *reply)
{
uint32_t num_replies;
int i;
memset(reply, 0, sizeof(*reply));
cbuf_read_uint32(cbuf, &num_replies);
if (num_replies != 2) {
fprintf(stderr, "Invalid number of replies (%u) from server\n", num_replies);
return EPROTO;
}
for (i=0; i<num_replies; i++) {
uint32_t rkey, type, size;
int ret = -1;
cbuf_read_uint32(cbuf, &rkey);
if (rkey != key) {
fprintf(stderr, "Wrong key %u, expected %u\n", rkey, key);
return EPROTO;
}
cbuf_read_uint32(cbuf, &type);
cbuf_read_uint32(cbuf, &size);
if (type == RESULT_TYPE_ECMD_DBUF) {
ret = cronus_parse_ecmd_dbuf(cbuf, size, reply);
} else if (type == RESULT_TYPE_INSTRUCTION_STATUS) {
ret = cronus_parse_instruction_status(cbuf, size, reply);
}
if (ret != 0)
return ret;
}
if (reply->rc != SERVER_COMMAND_COMPLETE) {
uint32_t size;
size = cbuf_size(cbuf) - cbuf_offset(cbuf);
reply->error = malloc(size);
if (!reply->error)
return ENOMEM;
cbuf_read(cbuf, (uint8_t *)reply->error, size);
}
return 0;
}
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