iscsiadm: add host mode

This prints out the info for iSCSI hosts in the system.

EXAMPLE
-------
iscsiadm -m host
cxgb3i: [9] 10.10.15.50,[00:07:43:05:97:07],eth3 <empty>

$TRANSPORT: [$HOST_NO] $HOST_IP,[$MAC},$NETDEV $INITIATORNAME

EXAMPLE
---------
iscsiadm -m host -P 2
Host Number: 9
        State: running
        Transport: cxgb3i
        Initiatorname: <empty>
        IPaddress: 10.10.15.50
        HWaddress: 00:07:43:05:97:07
        Netdev: eth3
        *********
        Sessions:
        *********
        Target: iqn.2001-04.com.home:meanminna
                Current Portal: 10.10.15.10:3260,1
                Persistent Portal: 10.10.15.10:3260,1
                        **********
                        Interface:
                        **********
                        Iface Name: cxgb3i
                        Iface Transport: cxgb3i
                        Iface Initiatorname: iqn.2005-06.com.redhat:noisymax
                        Iface IPaddress: 10.10.15.50
                        Iface HWaddress: 00:07:43:05:97:07
                        Iface Netdev: eth3
                        SID: 8
                        iSCSI Connection State: LOGGED IN
                        iSCSI Session State: LOGGED_IN
                        Internal iscsid Session State: NO CHANGE

                        **********
                        Interface:
                        **********
                        Iface Name: cxgb3i.def
                        Iface Transport: cxgb3i
                        Iface Initiatorname: iqn.2005-06.com.redhat:madmax
                        Iface IPaddress: 10.10.15.50
                        Iface HWaddress: 00:07:43:05:97:07
                        Iface Netdev: eth3
                        SID: 9
                        iSCSI Connection State: LOGGED IN
                        iSCSI Session State: LOGGED_IN
                        Internal iscsid Session State: NO CHANGE

1 files changed, 212 insertions, 0 deletions

diff --git a/usr/host.c b/usr/host.c
new file mode 100644
index 0000000..1f6ffb2
--- /dev/null
+++ b/usr/host.c
@@ -0,0 +1,212 @@
+/*
+ * iSCSI host helpers
+ *
+ * Copyright (C) 2008 Mike Christie
+ * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
+ * maintained by open-iscsi@@googlegroups.com
+ *
+ * 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.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "list.h"
+#include "util.h"
+#include "log.h"
+#include "iscsi_sysfs.h"
+#include "version.h"
+#include "iscsi_settings.h"
+#include "mgmt_ipc.h"
+#include "host.h"
+#include "session_info.h"
+#include "transport.h"
+#include "initiator.h"
+#include "iface.h"
+
+static int match_host_to_session(void *data, struct session_info *info)
+{
+	uint32_t host_no = *(uint32_t *) data;
+	uint32_t info_host_no;
+	int rc;
+
+	info_host_no = iscsi_sysfs_get_host_no_from_sid(info->sid, &rc);
+	if (rc) {
+		log_error("could not get host_no for session%d err %d.",
+			  info->sid, rc);
+		return 0;
+	}
+
+	return host_no == info_host_no;
+}
+
+static void print_host_info(struct iface_rec *iface, char *prefix)
+{
+	if (strlen(iface->transport_name))
+		printf("%sTransport: %s\n", prefix,
+		      iface->transport_name);
+	else
+		printf("%sTransport: %s\n", prefix, UNKNOWN_VALUE);
+
+	if (strlen(iface->iname))
+		printf("%sInitiatorname: %s\n", prefix,
+		      iface->iname);
+	else
+		printf("%sInitiatorname: %s\n", prefix, UNKNOWN_VALUE);
+
+	if (!strlen(iface->ipaddress))
+		printf("%sIPaddress: %s\n", prefix, UNKNOWN_VALUE);
+	else if (strchr(iface->ipaddress, '.'))
+		printf("%sIPaddress: %s\n", prefix, iface->ipaddress);
+	else
+		printf("%sIPaddress: [%s]\n", prefix, iface->ipaddress);
+
+	if (strlen(iface->hwaddress))
+		printf("%sHWaddress: %s\n", prefix, iface->hwaddress);
+	else
+		printf("%sHWaddress: %s\n", prefix, UNKNOWN_VALUE);
+
+	if (strlen(iface->netdev))
+		printf("%sNetdev: %s\n", prefix, iface->netdev);
+	else
+		printf("%sNetdev: %s\n", prefix, UNKNOWN_VALUE);
+}
+
+static int host_info_print_flat(void *data, struct host_info *hinfo)
+{
+	struct iface_rec *iface = &hinfo->iface;
+
+	if (strlen(iface->transport_name))
+		printf("%s: ", iface->transport_name);
+	else
+		printf("%s: ", UNKNOWN_VALUE);
+
+	printf("[%u] ", hinfo->host_no);
+
+	if (!strlen(iface->ipaddress))
+		printf("%s,", UNKNOWN_VALUE);
+	else if (strchr(iface->ipaddress, '.'))
+		printf("%s,", iface->ipaddress);
+	else
+		printf("[%s],", iface->ipaddress);
+
+	if (strlen(iface->hwaddress))
+		printf("[%s],", iface->hwaddress);
+	else
+		printf("[%s],", UNKNOWN_VALUE);
+
+	if (strlen(iface->netdev))
+		printf("%s ", iface->netdev);
+	else
+		printf("%s ", UNKNOWN_VALUE);
+
+	if (strlen(iface->iname))
+		printf("%s\n", iface->iname);
+	else
+		printf("%s\n", UNKNOWN_VALUE);
+	return 0;
+}
+
+static int host_info_print_tree(void *data, struct host_info *hinfo)
+{
+	struct list_head sessions;
+	struct session_link_info link_info;
+	int err, num_found = 0;
+	unsigned int session_info_flags = *(unsigned int *)data;
+	char state[SCSI_MAX_STATE_VALUE];
+
+	INIT_LIST_HEAD(&sessions);
+
+	printf("Host Number: %u\n", hinfo->host_no);
+	if (!iscsi_sysfs_get_host_state(state, hinfo->host_no))
+		printf("\tState: %s\n", state);
+	else
+		printf("\tState: Unknown\n");
+	print_host_info(&hinfo->iface, "\t");
+
+	if (!session_info_flags)
+		return 0;
+
+	link_info.list = &sessions;
+	link_info.match_fn = match_host_to_session;
+	link_info.data = &hinfo->host_no;
+
+	err = iscsi_sysfs_for_each_session(&link_info, &num_found,
+					   session_info_create_list);
+	if (err || !num_found)
+		return 0;
+
+	printf("\t*********\n");
+	printf("\tSessions:\n");
+	printf("\t*********\n");
+
+	session_info_print_tree(&sessions, "\t", session_info_flags);
+	session_info_free_list(&sessions);
+	return 0;
+}
+
+int host_info_print(int info_level, uint32_t host_no)
+{
+	int num_found = 0, err = 0;
+	char *version;
+	unsigned int flags = 0;
+
+	switch (info_level) {
+	case 0:
+	case -1:
+		err = iscsi_sysfs_for_each_host(NULL, &num_found,
+						host_info_print_flat);
+		break;
+	case 4:
+		version = iscsi_sysfs_get_iscsi_kernel_version();
+		if (version) {
+			printf("iSCSI Transport Class version %s\n",
+			       version);
+			printf("version %s\n", ISCSI_VERSION_STR);
+		}
+
+		flags |= SESSION_INFO_SCSI_DEVS;
+		/* fall through */
+	case 3:
+		flags |= SESSION_INFO_ISCSI_PARAMS;
+		/* fall through */
+	case 2:
+		flags |= SESSION_INFO_ISCSI_STATE | SESSION_INFO_IFACE;
+		/* fall through */
+	case 1:
+		if (host_no != -1) {
+			struct host_info hinfo;
+
+			memset(&hinfo, 0, sizeof(struct host_info));
+			hinfo.host_no = host_no;
+			iscsi_sysfs_get_hostinfo_by_host_no(&hinfo);
+			host_info_print_tree(&flags, &hinfo);
+			num_found = 1;
+			break;
+		}
+
+		err = iscsi_sysfs_for_each_host(&flags, &num_found,
+						host_info_print_tree);
+		break;
+	default:
+		log_error("Invalid info level %d. Try 0 - 4.", info_level);
+		return EINVAL;
+	}
+
+	if (err) {
+		log_error("Can not get list of iSCSI hosts (%d)", err);
+		return err;
+	} else if (!num_found)
+		log_error("No iSCSI hosts.");
+	return 0;
+}