Blame SOURCES/0019-libiscsi-introduce-sessions-API.patch

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From 7671cd56d36a76e954318cbdce3f08fc40aa3fe4 Mon Sep 17 00:00:00 2001
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From: Peter Hatina <phatina@redhat.com>
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Date: Mon, 5 Oct 2015 16:50:36 -0700
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Subject: [PATCH 19/32] libiscsi introduce sessions API
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---
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 libiscsi/libiscsi.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++
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 libiscsi/libiscsi.h |  56 +++++++++++++++++++++++
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 usr/iscsi_sysfs.c   |   6 +++
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 usr/iscsi_sysfs.h   |   2 +
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 4 files changed, 189 insertions(+)
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diff --git a/libiscsi/libiscsi.c b/libiscsi/libiscsi.c
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index 064e4b570d0b..755c18ca8e3b 100644
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--- a/libiscsi/libiscsi.c
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+++ b/libiscsi/libiscsi.c
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@@ -3,6 +3,7 @@
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  *
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  * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
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  * Copyright (C) 2008-2009 Hans de Goede <hdegoede@redhat.com>
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+ * Copyright (C) 2015      Peter Hatina <phatina@redhat.com>
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  * maintained by open-iscsi@googlegroups.com
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  *
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  * This program is free software; you can redistribute it and/or modify
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@@ -469,6 +470,130 @@ leave:
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 	return rc;
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 }
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+struct libiscsi_session_array {
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+	int cnt;
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+	int size;
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+	struct libiscsi_session_info *data;
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+};
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+
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+static void libiscsi_session_array_init(struct libiscsi_session_array *arr)
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+{
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+	arr->cnt = 0;
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+	arr->size = 0;
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+	arr->data = NULL;
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+}
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+
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+static int libiscsi_session_array_grow(struct libiscsi_session_array *arr)
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+{
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+	if (arr->size == 0)
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+		arr->size = 4;
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+	else
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+		arr->size *= 2;
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+
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+	arr->data = (struct libiscsi_session_info *) realloc(
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+		arr->data,
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+		arr->size * sizeof(struct libiscsi_session_info));
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+
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+	return arr->data ? 0 : 1;
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+}
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+
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+static int libiscsi_session_array_grow_ondemand(struct libiscsi_session_array *arr)
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+{
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+	if (arr->size == arr->cnt)
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+		return libiscsi_session_array_grow(arr);
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+	return 0;
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+}
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+
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+static int libiscsi_session_array_resize_precize(struct libiscsi_session_array *arr)
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+{
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+	arr->data = (struct libiscsi_session_info *) realloc(
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+		arr->data,
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+		arr->cnt * sizeof(struct libiscsi_session_info));
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+	arr->size = arr->cnt;
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+
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+	return arr->data ? 0 : 1;
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+}
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+
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+static void copy_session_info_to_libiscsi_session_info(
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+	struct libiscsi_session_info *info,
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+	struct session_info *s_info)
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+{
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+	/* Copy session info to public struct. */
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+	info->sid = s_info->sid;
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+	/* Timeouts */
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+	memcpy(&info->tmo, &s_info->tmo, sizeof(struct libiscsi_session_timeout));
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+	/* CHAP authentication information */
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+	memcpy(&info->chap, &s_info->chap, sizeof(struct libiscsi_chap_auth_info));
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+	/* Target information */
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+	strncpy(info->targetname, s_info->targetname, LIBISCSI_VALUE_MAXLEN);
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+	strncpy(info->address, s_info->address, NI_MAXHOST);
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+	strncpy(info->persistent_address, s_info->persistent_address, NI_MAXHOST);
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+	info->tpgt = s_info->tpgt;
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+	info->persistent_port = s_info->persistent_port;
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+}
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+
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+static int get_sessions_helper(void *data, struct session_info *s_info)
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+{
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+	struct libiscsi_session_array *arr = (struct libiscsi_session_array *) data;
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+
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+	if (libiscsi_session_array_grow_ondemand(arr) != 0)
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+		return 1;
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+
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+	copy_session_info_to_libiscsi_session_info(&arr->data[arr->cnt++], s_info);
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+
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+	return 0;
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+}
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+
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+int libiscsi_get_session_infos(struct libiscsi_context *context,
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+	struct libiscsi_session_info **infos,
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+	int *nr_sessions)
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+{
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+	int rc = 0;
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+	int nr_found = 0;
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+	struct libiscsi_session_array arr;
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+
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+	if (!context || !infos || !nr_sessions)
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+		return 1;
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+
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+	libiscsi_session_array_init(&arr;;
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+
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+	rc = iscsi_sysfs_for_each_session((void *) &arr, &nr_found,
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+		get_sessions_helper, 0);
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+	if (rc != 0 || nr_found == 0) {
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+		strcpy(context->error_str, "No matching session");
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+		return ENODEV;
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+	}
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+
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+	if (libiscsi_session_array_resize_precize(&arr) != 0) {
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+		strcpy(context->error_str, "Can't allocate memory for session infos");
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+		return ENOMEM;
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+	}
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+
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+	*infos = arr.data;
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+	*nr_sessions = nr_found;
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+
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+	return 0;
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+}
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+
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+int libiscsi_get_session_info_by_id(struct libiscsi_context *context,
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+	struct libiscsi_session_info *info,
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+	const char *session)
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+{
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+	struct session_info s_info;
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+
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+	if (!context || !info || !session)
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+		return 1;
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+
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+	if (iscsi_sysfs_get_sessioninfo_by_id(&s_info, (char*) session) != 0) {
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+		strcpy(context->error_str, "No matching session");
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+		return ENODEV;
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+	}
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+
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+	copy_session_info_to_libiscsi_session_info(info, &s_info);
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+
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+	return 0;
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+}
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+
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 int libiscsi_node_set_parameter(struct libiscsi_context *context,
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 	const struct libiscsi_node *node,
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 	const char *parameter, const char *value)
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diff --git a/libiscsi/libiscsi.h b/libiscsi/libiscsi.h
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index 756590e14d8b..a9891f48b7d6 100644
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--- a/libiscsi/libiscsi.h
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+++ b/libiscsi/libiscsi.h
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@@ -3,6 +3,7 @@
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  *
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  * Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
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  * Copyright (C) 2008-2009 Hans de Goede <hdegoede@redhat.com>
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+ * Copyright (C) 2015      Peter Hatina <phatina@redhat.com>
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  * maintained by open-iscsi@googlegroups.com
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  *
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  * This program is free software; you can redistribute it and/or modify
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@@ -56,6 +57,17 @@ enum libiscsi_auth_t {
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  */
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 struct libiscsi_context;
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+/** \brief iSCSI session timeouts
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+ *
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+ * Struct holding session timeouts.
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+ */
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+struct libiscsi_session_timeout {
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+    int abort_tmo;
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+    int lu_reset_tmo;
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+    int recovery_tmo;
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+    int tgt_reset_tmo;
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+};
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+
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 /** \brief iSCSI node record
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  *
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  * Struct holding data uniquely identifying an iSCSI node.
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@@ -84,6 +96,24 @@ struct libiscsi_chap_auth_info {
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     char reverse_password[LIBISCSI_VALUE_MAXLEN] /** Reverse Password */;
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 };
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+/** \brief iSCSI session
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+ *
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+ * Struct hoding iSCSI session information.
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+ */
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+struct libiscsi_session_info {
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+    int sid;
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+
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+    struct libiscsi_session_timeout tmo;
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+    struct libiscsi_chap_auth_info chap;
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+
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+    char targetname[LIBISCSI_VALUE_MAXLEN];
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+    int tpgt;
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+    char address[NI_MAXHOST];
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+    int port;
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+    char persistent_address[NI_MAXHOST];
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+    int persistent_port;
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+};
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+
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 /** \brief generic libiscsi authentication information struct
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  *
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  * Struct holding authentication information for discovery and login.
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@@ -248,6 +278,32 @@ PUBLIC int libiscsi_node_login(struct libiscsi_context *context,
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 PUBLIC int libiscsi_node_logout(struct libiscsi_context *context,
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     const struct libiscsi_node *node);
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+/** \brief Get an array of iSCSI sessions.
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+ *
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+ * Get the array containing iSCSI sessions' information.
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+ *
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+ * \param context       libiscsi context to operate on.
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+ * \param infos         Array of iSCSI sessions' information.
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+ *                      Release with free().
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+ * \param nr_sessions   The number of elements in \e infos.
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+ * \return              0 on success, otherwise a standard error code
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+ *                      (from errno.h).
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+ */
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+PUBLIC int libiscsi_get_session_infos(struct libiscsi_context *context,
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+    struct libiscsi_session_info **infos, int *nr_sessions);
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+
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+/** \brief Get session information by session ID.
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+ *
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+ * \param context       libiscsi context to operate on.
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+ * \param info          iSCSI session information.
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+ * \param session       Session name.
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+ * \return              0 on success, otherwise a standard error code
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+ *                      (from errno.h)
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+ */
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+PUBLIC int libiscsi_get_session_info_by_id(struct libiscsi_context *context,
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+    struct libiscsi_session_info *info,
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+    const char *session);
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+
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 /** \brief Set an iSCSI parameter for the given node
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  *
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  * Set the given nodes iSCSI parameter named by \e parameter to value \e value.
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diff --git a/usr/iscsi_sysfs.c b/usr/iscsi_sysfs.c
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index fdc26c7bd9ba..80b7b0210fd1 100644
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--- a/usr/iscsi_sysfs.c
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+++ b/usr/iscsi_sysfs.c
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@@ -3,6 +3,7 @@
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  *
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  * Copyright (C) 2006 Mike Christie
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  * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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+ * Copyright (C) 2015      Peter Hatina <phatina@redhat.com>
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  *
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  * This program is free software; you can redistribute it and/or modify
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  * it under the terms of the GNU General Public License as published
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@@ -1146,6 +1147,11 @@ free_info:
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 	return rc;
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 }
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+const char *iscsi_sysfs_get_session_path(void)
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+{
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+	return ISCSI_SESSION_DIR;
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+}
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+
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 int iscsi_sysfs_for_each_iface_on_host(void *data, uint32_t host_no,
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 				       int *nr_found,
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 				       iscsi_sysfs_iface_op_fn *fn)
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diff --git a/usr/iscsi_sysfs.h b/usr/iscsi_sysfs.h
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index cdcefa65f683..12ad87f96c8c 100644
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--- a/usr/iscsi_sysfs.h
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+++ b/usr/iscsi_sysfs.h
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@@ -3,6 +3,7 @@
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  *
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  * Copyright (C) 2006 Mike Christie
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  * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
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+ * Copyright (C) 2015      Peter Hatina <phatina@redhat.com>
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  *
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  * This program is free software; you can redistribute it and/or modify
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  * it under the terms of the GNU General Public License as published
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@@ -47,6 +48,7 @@ typedef int (iscsi_sysfs_flashnode_op_fn)(void *, struct flashnode_rec *,
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 					  uint32_t, uint32_t);
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 typedef int (iscsi_sysfs_iface_op_fn)(void *, struct iface_rec *);
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+extern const char *iscsi_sysfs_get_session_path(void);
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 extern int iscsi_sysfs_for_each_iface_on_host(void *data, uint32_t host_no,
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 					      int *nr_found,
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 					      iscsi_sysfs_iface_op_fn *fn);
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-- 
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2.14.4
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