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#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/rtnetlink.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ev.h>
#include "list.h"
#include "log.h"
#include "pingu_burst.h"
#include "pingu_host.h"
#include "pingu_iface.h"
#include "pingu_ping.h"
#include "pingu_netlink.h"
#include "sockaddr_util.h"
static struct list_head iface_list = LIST_INITIALIZER(iface_list);
#define PINGU_ROUTE_TABLE_MIN 1
#define PINGU_ROUTE_TABLE_MAX 253
unsigned char used_route_table[256];
static void pingu_iface_socket_cb(struct ev_loop *loop, struct ev_io *w,
int revents)
{
struct pingu_iface *iface = container_of(w, struct pingu_iface, socket_watcher);
if (revents & EV_READ)
pingu_ping_read_reply(loop, iface);
}
int pingu_iface_bind_socket(struct pingu_iface *iface, int log_error)
{
int r;
if (iface->name[0] == '\0')
return 0;
r = setsockopt(iface->fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name,
strlen(iface->name));
if (r < 0 && log_error)
log_perror(iface->name);
iface->has_binding = (r == 0);
return r;
}
static int pingu_iface_init_socket(struct ev_loop *loop,
struct pingu_iface *iface)
{
iface->fd = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
if (iface->fd < 0) {
log_perror("socket");
return -1;
}
ev_io_init(&iface->socket_watcher, pingu_iface_socket_cb,
iface->fd, EV_READ);
ev_io_start(loop, &iface->socket_watcher);
return 0;
}
int pingu_iface_usable(struct pingu_iface *iface)
{
if (iface->name[0] == '\0')
return 1;
return iface->has_link && iface->has_binding;
}
struct pingu_iface *pingu_iface_get_by_name(const char *name)
{
struct pingu_iface *iface;
list_for_each_entry(iface, &iface_list, iface_list_entry) {
if (name == NULL) {
if (iface->name[0] == '\0')
return iface;
} else if (strncmp(name, iface->name, sizeof(iface->name)) == 0) {
return iface;
}
}
return NULL;
}
struct pingu_iface *pingu_iface_get_by_index(int index)
{
struct pingu_iface *iface;
list_for_each_entry(iface, &iface_list, iface_list_entry) {
if (iface->index == index)
return iface;
}
return NULL;
}
struct pingu_iface *pingu_iface_get_by_name_or_new(const char *name)
{
struct pingu_iface *iface = pingu_iface_get_by_name(name);
if (iface != NULL)
return iface;
iface = calloc(1, sizeof(struct pingu_iface));
if (iface == NULL) {
log_perror("calloc(iface)");
return NULL;
}
if (name != NULL)
strlcpy(iface->name, name, sizeof(iface->name));
list_init(&iface->ping_list);
list_init(&iface->gateway_list);
list_add(&iface->iface_list_entry, &iface_list);
return iface;
}
void pingu_iface_set_addr(struct pingu_iface *iface, int family,
void *data, int len)
{
sockaddr_init(&iface->primary_addr, family, data);
if (len <= 0 || data == NULL) {
pingu_gateway_del_all(&iface->gateway_list);
log_debug("%s: address removed", iface->name);
return;
}
log_debug("%s: new address: %s", iface->name,
inet_ntoa(iface->primary_addr.sin.sin_addr));
}
#if 0
void pingu_gateway_dump(struct pingu_iface *iface)
{
struct pingu_gateway *gw;
list_for_each_entry(gw, &iface->gateway_list, gateway_list_entry) {
char buf[64];
sockaddr_to_string(&gw->gw_addr, buf, sizeof(buf));
log_debug("dump: %s: via %s metric %i", iface->name, buf,
gw->metric);
}
}
#endif
void pingu_iface_gw_action(struct pingu_iface *iface,
struct pingu_gateway *gw, int action)
{
switch (action) {
case RTM_NEWROUTE:
pingu_gateway_add(&iface->gateway_list, gw);
log_debug("%s: added default gateway", iface->name);
break;
case RTM_DELROUTE:
pingu_gateway_del(&iface->gateway_list, gw);
log_debug("%s: removed default gateway", iface->name);
break;
}
kernel_route_multipath(action, &iface_list, RT_TABLE_MAIN);
}
void pingu_iface_update_routes(struct pingu_iface *iface, int action)
{
struct pingu_gateway *route;
list_for_each_entry(route, &iface->gateway_list, gateway_list_entry) {
kernel_route_modify(action, route, iface, RT_TABLE_MAIN);
}
kernel_route_multipath(action, &iface_list, RT_TABLE_MAIN);
}
int pingu_iface_set_route_table(struct pingu_iface *iface, int table)
{
static int initialized = 0;
int i = 1;
if (!initialized) {
memset(used_route_table, 0, sizeof(used_route_table));
initialized = 1;
}
if (table == PINGU_ROUTE_TABLE_AUTO) {
while (i < 253 && used_route_table[i])
i++;
table = i;
}
if (table < PINGU_ROUTE_TABLE_MIN || table >= PINGU_ROUTE_TABLE_MAX) {
log_error("Invalid route table %i", table);
return -1;
}
used_route_table[table] = 1;
iface->route_table = table;
return table;
}
int pingu_iface_init(struct ev_loop *loop)
{
struct pingu_iface *iface;
list_for_each_entry(iface, &iface_list, iface_list_entry) {
if (iface->route_table == 0)
pingu_iface_set_route_table(iface, PINGU_ROUTE_TABLE_AUTO);
if (pingu_iface_init_socket(loop, iface) == -1)
return -1;
}
return 0;
}
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