mirror of
https://github.com/ibm-s390-linux/s390-tools.git
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b627b8d8e1
This commit is based on the s390-tools-1.39.0 version. Changes on top of s390-tools-1.39.0: - Add MIT license to all source files - Add LICENSE file - Transform REAMDE to README.md (markdown) - Add AUTHORS.md file - Add CONTRIBUTING.md file - Move changelog from README to CHANGELOG.md file Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
111 lines
2.2 KiB
C
111 lines
2.2 KiB
C
/*
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* zdev - Modify and display the persistent configuration of devices
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*
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* Copyright IBM Corp. 2016, 2017
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <ctype.h>
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#include <string.h>
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#include "devnode.h"
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#include "iscsi.h"
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#include "misc.h"
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#include "path.h"
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/* Retrieve the IP address of the iSCSI initiator networking portal associated
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* with block device @blkdev. */
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static char *ip_from_blockdev(struct devnode *blkdev)
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{
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char *link, *curr, *end, *path = NULL, *ip = NULL;
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link = devnode_readlink(blkdev);
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if (!link)
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return NULL;
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/* ../../devices/platform/host0/session1/target0:0:0/0:0:0:1/... */
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curr = strstr(link, "/devices/");
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if (!curr)
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goto out;
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curr++;
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/* curr=devices/platform/host0/session1/target0:0:0/0:0:0:1/... */
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end = strstr(curr, "/session");
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if (!end)
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goto out;
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*end = 0;
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/* curr=devices/platform/host0 */
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end = strstr(curr, "/host");
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if (!end)
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goto out;
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end++;
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/* curr=devices/platform/host0
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* end=host0 */
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path = path_get("/sys/%s/iscsi_host/%s/ipaddress", curr, end);
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ip = misc_read_text_file(path, 0, err_ignore);
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out:
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free(path);
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free(link);
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return ip;
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}
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static struct devnode *netdev_from_ip(char *ip)
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{
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char *cmd, *text, *dev, *end;
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struct devnode *devnode = NULL;
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cmd = misc_asprintf("%s -o address show to %s 2>/dev/null", PATH_IP,
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ip);
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text = misc_read_cmd_output(cmd, 0, err_ignore);
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if (!text)
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goto out;
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/* text=2: enccw0.0.f5f0 inet ... */
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for (dev = text; *dev && !isspace(*dev); dev++);
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/* dev= enccw0.0.f5f0 inet ... */
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for (; isspace(*dev); dev++);
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/* dev=enccw0.0.f5f0 inet ... */
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for (end = dev; *end && !isspace(*end); end++);
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if (end == dev)
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goto out;
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*end = 0;
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/* dev=enccw0.0.f5f0 */
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devnode = devnode_new(NETDEV, 0, 0, dev);
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out:
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free(cmd);
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free(text);
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return devnode;
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}
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/* Retrieve the networking device devnode that provides the specified
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* iSCSI block device @blkdev. */
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struct devnode *iscsi_get_net_devnode(struct devnode *blkdev)
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{
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struct devnode *devnode = NULL;
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char *ip;
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if (blkdev->type != BLOCKDEV)
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return NULL;
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ip = ip_from_blockdev(blkdev);
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if (!ip)
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return NULL;
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devnode = netdev_from_ip(ip);
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free(ip);
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return devnode;
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}
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