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/*
* zdev - Modify and display the persistent configuration of devices
*
* Copyright IBM Corp. 2016, 2017
*
* s390-tools is free software; you can redistribute it and/or modify
* it under the terms of the MIT license. See LICENSE for details.
*/
#include <ctype.h>
#include <stdbool.h>
#include <string.h>
#include "devnode.h"
#include "misc.h"
#include "net.h"
#include "path.h"
struct add_linked_cb_data {
struct util_list *list;
const char *prefix;
size_t prefix_len;
bool result;
};
/* Add a devnode to data->list for each sysfs link that indicates a linked
* device. */
static exit_code_t add_linked_cb(const char *abs_path, const char *rel_path,
void *data)
{
struct add_linked_cb_data *cb_data = data;
const char *name;
struct devnode *d;
if (starts_with(rel_path, cb_data->prefix)) {
name = rel_path + cb_data->prefix_len;
d = devnode_new(NETDEV, 0, 0, name);
ptrlist_add(cb_data->list, d);
cb_data->result = true;
}
return EXIT_OK;
}
/* Add devnodes for all networking devices that are linked to @devnode via
* a link starting with @prefix to @list. */
static bool add_devnodes_from_link(struct util_list *list,
struct devnode *devnode, const char *prefix)
{
struct add_linked_cb_data cb_data;
char *path;
cb_data.list = list;
cb_data.prefix = prefix;
cb_data.prefix_len = strlen(prefix);
cb_data.result = false;
path = path_get_sys_class("net", devnode->name);
path_for_each(path, add_linked_cb, &cb_data);
free(path);
return cb_data.result;
}
/* Add devnodes for all devices to @list that are linked as "lower" devices
* of network interface @devnode. */
bool net_add_linked_devnodes(struct util_list *list, struct devnode *devnode)
{
return add_devnodes_from_link(list, devnode, "lower_");
}
#define DEVICE_PREFIX "Device:"
/* If @devnode refers to a vlan device, add a devnode representing its
* base device to @list. */
bool net_add_vlan_base(struct util_list *list, struct devnode *devnode)
{
char *path, *text, *name, *end;
bool rc = false;
path = path_get("/proc/net/vlan/%s", devnode->name);
text = misc_read_text_file(path, 0, err_ignore);
if (!text)
goto out;
name = strstr(text, DEVICE_PREFIX);
if (!name)
goto out;
name += sizeof(DEVICE_PREFIX) - 1;
for (; *name && isspace(*name); name++) ;
for (end = name; *end && !isspace(*end); end++) ;
if (name == end)
goto out;
*end = 0;
ptrlist_add(list, devnode_new(NETDEV, 0, 0, name));
rc = true;
out:
free(text);
free(path);
return rc;
}
/* If @devnode refers to a bonding device, add a devnode representing its
* base device to @list. */
bool net_add_bonding_base(struct util_list *list, struct devnode *devnode)
{
return add_devnodes_from_link(list, devnode, "slave_");
}
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