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handler.c
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handler.c
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/*
* This file is a part of plotnetcfg, a tool to visualize network config.
* Copyright (C) 2014 Red Hat, Inc. -- Jiri Benc <jbenc@redhat.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.
*/
#include <stdlib.h>
#include <string.h>
#include "netns.h"
#include "if.h"
#include "handler.h"
static struct handler *handlers = NULL;
static struct handler *handlers_tail = NULL;
static struct global_handler *ghandlers = NULL;
static struct global_handler *ghandlers_tail = NULL;
void handler_register(struct handler *h)
{
h->next = NULL;
if (!handlers) {
handlers = handlers_tail = h;
return;
}
handlers_tail->next = h;
handlers_tail = h;
}
static int driver_match(struct handler *h, struct if_entry *e)
{
return !h->driver || (e->driver && !strcmp(h->driver, e->driver));
}
#define handler_err_loop(err, method, entry, ...) \
{ \
struct handler *ptr; \
\
for (ptr = handlers; ptr; ptr = ptr->next) { \
if (!ptr->method || !driver_match(ptr, entry)) \
continue; \
err = ptr->method(entry, ##__VA_ARGS__); \
if (err) \
break; \
} \
}
#define handler_loop(method, entry, ...) \
{ \
struct handler *ptr; \
\
for (ptr = handlers; ptr; ptr = ptr->next) { \
if (!ptr->method || !driver_match(ptr, entry)) \
continue; \
ptr->method(entry, ##__VA_ARGS__); \
} \
}
int handler_netlink(struct if_entry *entry, struct rtattr **tb)
{
int err = 0;
handler_err_loop(err, netlink, entry, tb);
return err;
}
int handler_scan(struct if_entry *entry)
{
int err = 0;
handler_err_loop(err, scan, entry);
return err;
}
int handler_post(struct netns_entry *root)
{
struct netns_entry *ns;
struct if_entry *entry;
int err = 0;
for (ns = root; ns; ns = ns->next) {
for (entry = ns->ifaces; entry; entry = entry->next) {
handler_err_loop(err, post, entry, root);
if (err)
return err;
}
}
return 0;
}
void handler_cleanup(struct if_entry *entry)
{
handler_loop(cleanup, entry);
}
void handler_generic_cleanup(struct if_entry *entry)
{
free(entry->handler_private);
}
#define ghandler_loop(method, ...) \
{ \
struct global_handler *ptr; \
\
for (ptr = ghandlers; ptr; ptr = ptr->next) { \
if (!ptr->method) \
continue; \
ptr->method(__VA_ARGS__); \
} \
}
void global_handler_register(struct global_handler *h)
{
h->next = NULL;
if (!ghandlers) {
ghandlers = ghandlers_tail = h;
return;
}
ghandlers_tail->next = h;
ghandlers_tail = h;
}
void global_handler_init(void)
{
ghandler_loop(init);
}
int global_handler_post(struct netns_entry *root)
{
struct global_handler *h;
int err;
for (h = ghandlers; h; h = h->next) {
if (!h->post)
continue;
err = h->post(root);
if (err)
return err;
}
return 0;
}
void global_handler_cleanup(struct netns_entry *root)
{
ghandler_loop(cleanup, root);
}