/*-
* Copyright (c) 2003 Poul-Henning Kamp
* All rights reserved.
*
* 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.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <stdint.h>
#include <sys/types.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <paths.h>
#include <sys/queue.h>
#define GCTL_TABLE 1
#include <libgeom.h>
/*
* Global pointer to a string that is used to avoid an errorneous free in
* gctl_free.
*/
static char nomemmsg[] = "Could not allocate memory";
void
gctl_dump(struct gctl_req *req, FILE *f)
{
unsigned int i;
int j;
struct gctl_req_arg *ap;
if (req == NULL) {
fprintf(f, "Dump of gctl request at NULL\n");
return;
}
fprintf(f, "Dump of gctl request at %p:\n", req);
if (req->error != NULL)
fprintf(f, " error:\t\"%s\"\n", req->error);
else
fprintf(f, " error:\tNULL\n");
for (i = 0; i < req->narg; i++) {
ap = &req->arg[i];
fprintf(f, " param:\t\"%s\" (%d)", ap->name, ap->nlen);
fprintf(f, " [%s%s",
ap->flag & GCTL_PARAM_RD ? "R" : "",
ap->flag & GCTL_PARAM_WR ? "W" : "");
fflush(f);
if (ap->flag & GCTL_PARAM_ASCII)
fprintf(f, "%d] = \"%s\"", ap->len, (char *)ap->value);
else if (ap->len > 0) {
fprintf(f, "%d] = ", ap->len);
fflush(f);
for (j = 0; j < ap->len; j++) {
fprintf(f, " %02x", ((u_char *)ap->value)[j]);
}
} else {
fprintf(f, "0] = %p", ap->value);
}
fprintf(f, "\n");
}
}
/*
* Set an error message, if one does not already exist.
*/
static void
gctl_set_error(struct gctl_req *req, const char *error, ...)
{
va_list ap;
if (req->error != NULL)
return;
va_start(ap, error);
vasprintf(&req->error, error, ap);
va_end(ap);
}
/*
* Check that a malloc operation succeeded, and set a consistent error
* message if not.
*/
static void
gctl_check_alloc(struct gctl_req *req, void *ptr)
{
if (ptr != NULL)
return;
gctl_set_error(req, nomemmsg);
if (req->error == NULL)
req->error = nomemmsg;
}
/*
* Allocate a new request handle of the specified type.
* XXX: Why bother checking the type ?
*/
struct gctl_req *
gctl_get_handle(void)
{
return (calloc(1, sizeof(struct gctl_req)));
}
/*
* Allocate space for another argument.
*/
static struct gctl_req_arg *
gctl_new_arg(struct gctl_req *req)
{
struct gctl_req_arg *ap;
req->narg++;
req->arg = reallocf(req->arg, sizeof *ap * req->narg);
gctl_check_alloc(req, req->arg);
if (req->arg == NULL) {
req->narg = 0;
return (NULL);
}
ap = req->arg + (req->narg - 1);
memset(ap, 0, sizeof *ap);
return (ap);
}
static void
gctl_param_add(struct gctl_req *req, const char *name, int len, void *value,
int flag)
{
struct gctl_req_arg *ap;
if (req == NULL || req->error != NULL)
return;
ap = gctl_new_arg(req);
if (ap == NULL)
return;
ap->name = strdup(name);
gctl_check_alloc(req, ap->name);
if (ap->name == NULL)
return;
ap->nlen = strlen(ap->name) + 1;
ap->value = value;
ap->flag = flag;
if (len >= 0)
ap->len = len;
else if (len < 0) {
ap->flag |= GCTL_PARAM_ASCII;
ap->len = strlen(value) + 1;
}
}
void
gctl_ro_param(struct gctl_req *req, const char *name, int len, const void* value)
{
gctl_param_add(req, name, len, __DECONST(void *, value), GCTL_PARAM_RD);
}
void
gctl_rw_param(struct gctl_req *req, const char *name, int len, void *value)
{
gctl_param_add(req, name, len, value, GCTL_PARAM_RW);
}
const char *
gctl_issue(struct gctl_req *req)
{
int fd, error;
if (req == NULL)
return ("NULL request pointer");
if (req->error != NULL)
return (req->error);
req->version = GCTL_VERSION;
req->lerror = BUFSIZ; /* XXX: arbitrary number */
req->error = calloc(1, req->lerror);
if (req->error == NULL) {
gctl_check_alloc(req, req->error);
return (req->error);
}
req->lerror--;
fd = open(_PATH_DEV PATH_GEOM_CTL, O_RDONLY);
if (fd < 0)
return(strerror(errno));
error = ioctl(fd, GEOM_CTL, req);
close(fd);
if (req->error[0] != '\0')
return (req->error);
if (error != 0)
return(strerror(errno));
return (NULL);
}
void
gctl_free(struct gctl_req *req)
{
unsigned int i;
if (req == NULL)
return;
for (i = 0; i < req->narg; i++) {
if (req->arg[i].name != NULL)
free(req->arg[i].name);
}
free(req->arg);
if (req->error != NULL && req->error != nomemmsg)
free(req->error);
free(req);
}
