[Qemu-devel] [PATCH 01/14] ./block/iscsi/init.c

[ronniesahlberg]

From: Ronnie Sahlberg <address@hidden>

iscsi  client library  : init.c
This file contains functions to create a iscsi context,
destroy a context, error reporting api, as well
as basic functions to manipulate properties of an iscsi context.

...

./block/iscsi/ contains a copy of a general purpose iscsi client
library which is aimed at providing a clientside api for iscsi
for both qemu/kvm as well as otther scsi related utilities.

As such, there is need to make merging across various consumers,
qemu/kvm being one of many here, as easy as possible when features
are added to the library.
As such, no consumer/qemu specific code is used in this library as well
as coding guidelined might not be adhered to 100%

It is the intention that this library will be useful for many
and that iscsi use spawned from this will flourish.

Signed-off-by: Ronnie Sahlberg <address@hidden>
---
 block/iscsi/init.c |  215 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 215 insertions(+), 0 deletions(-)
 create mode 100644 block/iscsi/init.c

diff --git a/block/iscsi/init.c b/block/iscsi/init.c
new file mode 100644
index 0000000..c6ed347
--- /dev/null
+++ b/block/iscsi/init.c
@@ -0,0 +1,215 @@
+/*
+   Copyright (C) 2010 by Ronnie Sahlberg <address@hidden>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <time.h>
+#include "iscsi.h"
+#include "iscsi-private.h"
+#include "slist.h"
+
+
+struct iscsi_context *
+iscsi_create_context(const char *initiator_name)
+{
+       struct iscsi_context *iscsi;
+
+       iscsi = malloc(sizeof(struct iscsi_context));
+       if (iscsi == NULL) {
+               return NULL;
+       }
+
+       bzero(iscsi, sizeof(struct iscsi_context));
+
+       iscsi->initiator_name = strdup(initiator_name);
+       if (iscsi->initiator_name == NULL) {
+               free(iscsi);
+               return NULL;
+       }
+
+       iscsi->fd = -1;
+
+       /* use a "random" isid */
+       srandom(getpid() ^ time(NULL));
+       iscsi_set_random_isid(iscsi);
+
+       return iscsi;
+}
+
+int
+iscsi_set_random_isid(struct iscsi_context *iscsi)
+{
+       iscsi->isid[0] = 0x80;
+       iscsi->isid[1] = random()&0xff;
+       iscsi->isid[2] = random()&0xff;
+       iscsi->isid[3] = random()&0xff;
+       iscsi->isid[4] = 0;
+       iscsi->isid[5] = 0;
+
+       return 0;
+}
+
+int
+iscsi_set_alias(struct iscsi_context *iscsi, const char *alias)
+{
+       if (iscsi->is_loggedin != 0) {
+               iscsi_set_error(iscsi, "Already logged in when adding alias\n");
+               return -2;
+       }
+
+       if (iscsi->alias != NULL) {
+               free(discard_const(iscsi->alias));
+               iscsi->alias = NULL;
+       }
+
+       iscsi->alias = strdup(alias);
+       if (iscsi->alias == NULL) {
+               iscsi_set_error(iscsi, "Failed to allocate alias name\n");
+               return -3;
+       }
+
+       return 0;
+}
+
+int
+iscsi_set_targetname(struct iscsi_context *iscsi, const char *target_name)
+{
+       if (iscsi->is_loggedin != 0) {
+               iscsi_set_error(iscsi, "Already logged in when adding "
+                               "targetname\n");
+               return -2;
+       }
+
+       if (iscsi->target_name != NULL) {
+               free(discard_const(iscsi->target_name));
+               iscsi->target_name = NULL;
+       }
+
+       iscsi->target_name = strdup(target_name);
+       if (iscsi->target_name == NULL) {
+               iscsi_set_error(iscsi, "Failed to allocate target name\n");
+               return -3;
+       }
+
+       return 0;
+}
+
+int
+iscsi_destroy_context(struct iscsi_context *iscsi)
+{
+       struct iscsi_pdu *pdu;
+
+       if (iscsi == NULL) {
+               return 0;
+       }
+       if (iscsi->initiator_name != NULL) {
+               free(discard_const(iscsi->initiator_name));
+               iscsi->initiator_name = NULL;
+       }
+       if (iscsi->target_name != NULL) {
+               free(discard_const(iscsi->target_name));
+               iscsi->target_name = NULL;
+       }
+       if (iscsi->alias != NULL) {
+               free(discard_const(iscsi->alias));
+               iscsi->alias = NULL;
+       }
+       if (iscsi->fd != -1) {
+               iscsi_disconnect(iscsi);
+       }
+
+       if (iscsi->inbuf != NULL) {
+               free(iscsi->inbuf);
+               iscsi->inbuf = NULL;
+               iscsi->insize = 0;
+               iscsi->inpos = 0;
+       }
+
+       while ((pdu = iscsi->outqueue)) {
+               SLIST_REMOVE(&iscsi->outqueue, pdu);
+               pdu->callback(iscsi, SCSI_STATUS_CANCELLED, NULL,
+                             pdu->private_data);
+               iscsi_free_pdu(iscsi, pdu);
+       }
+       while ((pdu = iscsi->waitpdu)) {
+               SLIST_REMOVE(&iscsi->waitpdu, pdu);
+               pdu->callback(iscsi, SCSI_STATUS_CANCELLED, NULL,
+                             pdu->private_data);
+               iscsi_free_pdu(iscsi, pdu);
+       }
+
+       if (iscsi->error_string != NULL) {
+               free(iscsi->error_string);
+       }
+
+       free(iscsi);
+
+       return 0;
+}
+
+
+
+void
+iscsi_set_error(struct iscsi_context *iscsi, const char *error_string, ...)
+{
+       va_list ap;
+       char *str;
+
+       va_start(ap, error_string);
+       if (vasprintf(&str, error_string, ap) < 0) {
+               /* not much we can do here */
+       }
+       if (iscsi->error_string != NULL) {
+               free(iscsi->error_string);
+       }
+       iscsi->error_string = str;
+       va_end(ap);
+}
+
+
+char *
+iscsi_get_error(struct iscsi_context *iscsi)
+{
+       return iscsi->error_string;
+}
+
+int
+iscsi_set_header_digest(struct iscsi_context *iscsi,
+                       enum iscsi_header_digest header_digest)
+{
+       if (iscsi->is_loggedin) {
+               iscsi_set_error(iscsi, "trying to set header digest while "
+                               "logged in\n");
+               return -2;
+       }
+
+       iscsi->want_header_digest = header_digest;
+
+       return 0;
+}
+
+int
+iscsi_is_logged_in(struct iscsi_context *iscsi)
+{
+       return iscsi->is_loggedin;
+}
-- 
1.7.3.1