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xapidb.c
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xapidb.c
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/*
* Copyright (c) Citrix Systems, Inc
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT
* HOLDER 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 <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <backend.h>
#include <debug.h>
#include <xapidb.h>
#include "option.h"
/* Path to the file used for resuming. */
static char *arg_resume;
/* Path to the file used for saving. */
static char *arg_save;
static bool
xapidb_parse_arg(const char *name, const char *val)
{
if (!strcmp(name, "resume"))
arg_resume = strdup(val);
else if (!strcmp(name, "save"))
arg_save = strdup(val);
else if (!strcmp(name, "uuid"))
xapidb_arg_uuid = strdup(val);
else if (!strcmp(name, "socket"))
xapidb_arg_socket = strdup(val);
else
return false;
return true;
}
static bool
xapidb_check_args(void)
{
if (!xapidb_arg_uuid) {
fprintf(stderr, "Backend arg 'uuid' is required\n");
return false;
}
if (!opt_resume && arg_resume) {
fprintf(stderr, "Backend arg 'resume' is invalid when not resuming\n");
return false;
}
return true;
}
static bool
xapidb_save(void)
{
FILE *f;
uint8_t *buf;
size_t len;
if (!arg_save)
return true;
if (!xapidb_serialize_variables(&buf, &len, false))
return false;
f = fopen(arg_save, "w");
if (!f) {
DBG("Failed to open '%s'\n", arg_save);
free(buf);
return false;
}
if (fwrite(buf, 1, len, f) != len) {
DBG("Failed to write to '%s': %s\n", arg_save, strerror(errno));
fclose(f);
free(buf);
return false;
}
free(buf);
fclose(f);
return true;
}
static bool
xapidb_resume(void)
{
FILE *f;
struct stat st;
uint8_t *buf, *ptr;
bool ret;
if (!arg_resume)
return true;
f = fopen(arg_resume, "r");
if (!f) {
DBG("Failed to open '%s'\n", arg_resume);
return false;
}
if (fstat(fileno(f), &st) == -1 || st.st_size < DB_HEADER_LEN ||
st.st_size > MAX_FILE_SIZE) {
DBG("Save file size is invalid\n");
fclose(f);
return false;
}
buf = malloc(st.st_size);
if (!buf) {
DBG("Failed to allocate memory\n");
fclose(f);
return false;
}
if (fread(buf, 1, st.st_size, f) != st.st_size) {
DBG("Failed to read from '%s'\n", arg_resume);
free(buf);
fclose(f);
return false;
}
fclose(f);
ptr = buf;
ret = xapidb_parse_blob(&ptr, st.st_size);
free(buf);
return ret;
}
const struct backend xapidb = {
.parse_arg = xapidb_parse_arg,
.check_args = xapidb_check_args,
.init = xapidb_init,
.save = xapidb_save,
.resume = xapidb_resume,
.set_variable = xapidb_set_variable,
.sb_notify = xapidb_sb_notify,
};