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/*
* proxy_dev.c - Proxy interface specific code in diald.
* The proxy interface is used to monitor packets
* when the physical link is down.
*
* Copyright (c) 1999 Mike Jagdis.
* All rights reserved. Please see the file LICENSE which should be
* distributed with this software for terms of use.
*/
#include "diald.h"
static char *current_proxy;
#ifdef HAVE_AF_PACKET
static int current_proxy_index;
#endif
static int proxy_dev_send(proxy_t *proxy,
unsigned short wprot, unsigned char *p, size_t len);
static int proxy_dev_recv(proxy_t *proxy, unsigned char *p, size_t len);
static void proxy_dev_start(proxy_t *proxy);
static void proxy_dev_stop(proxy_t *proxy);
static void proxy_dev_close(proxy_t *proxy);
static void proxy_dev_release(proxy_t *proxy);
int proxy_dev_init(proxy_t *proxy, char *proxydev);
static int
proxy_dev_send(proxy_t *proxy,
unsigned short wprot, unsigned char *p, size_t len)
{
struct sockaddr *to;
size_t to_len;
struct sockaddr_pkt sp;
#ifdef HAVE_AF_PACKET
struct sockaddr_ll sl;
if (af_packet) {
memset(&sl, 0, sizeof(sl));
sl.sll_family = AF_PACKET;
sl.sll_protocol = wprot;
sl.sll_ifindex = current_proxy_index;
to = (struct sockaddr *)&sl;
to_len = sizeof(sl);
} else
#endif
{
memset(&sp, 0, sizeof(sp));
sp.spkt_family = AF_INET;
strcpy(sp.spkt_device, current_proxy);
sp.spkt_protocol = wprot;
to = (struct sockaddr *)&sp;
to_len = sizeof(sp);
}
return sendto(proxy->fd, p, len, 0, to, to_len);
}
static int
proxy_dev_recv(proxy_t *proxy, unsigned char *p, size_t len)
{
union {
struct sockaddr sa;
#ifdef HAVE_AF_PACKET
struct sockaddr_ll sl;
#endif
} from;
size_t flen = sizeof(from);
unsigned char *q = p + sizeof(unsigned short);
size_t qlen = len - sizeof(unsigned short);
len = recvfrom(proxy->fd, q, qlen, 0, (struct sockaddr *)&from, &flen);
if (len <= 0)
return 0;
*(unsigned short *)p =
#ifdef HAVE_AF_PACKET
af_packet ? from.sl.sll_protocol :
#endif
htons(ETH_P_IP);
return len + sizeof(unsigned short);
}
static void
proxy_dev_start(proxy_t *proxy)
{
if (current_dev && !strcmp(current_proxy, current_dev)) {
if (proxy->fd >= 0) {
close(proxy->fd);
proxy->fd = -1;
}
proxy_dev_init(proxy, current_proxy);
return;
}
iface_start("proxy", proxy->iftype, proxy->ifunit,
orig_local_ip, orig_remote_ip, orig_broadcast_ip, metric+1);
}
static void
proxy_dev_stop(proxy_t *proxy)
{
if (current_dev && !strcmp(current_proxy, current_dev)) {
if (proxy->fd >= 0) {
close(proxy->fd);
proxy->fd = -1;
}
return;
}
iface_stop("proxy", proxy->iftype, proxy->ifunit,
orig_local_ip, orig_remote_ip, orig_broadcast_ip, metric+1);
}
static void
proxy_dev_close(proxy_t *proxy)
{
if (proxy->fd >= 0) {
close(proxy->fd);
proxy->fd = -1;
}
/* Do not remove the lock file here. If we do every time we fork
* a child we drop the lock. Instead we just let the lock go stale
* when we have finished. We should handle this better...
*/
}
static void
proxy_dev_release(proxy_t *proxy)
{
proxy_dev_stop(proxy);
if (!(current_dev && !strcmp(current_proxy, current_dev)))
iface_down("proxy", proxy->iftype, proxy->ifunit,
orig_local_ip, orig_remote_ip, orig_broadcast_ip, metric+1);
proxy_dev_close(proxy);
}
int
proxy_dev_init(proxy_t *proxy, char *proxydev)
{
int d, n;
#ifdef HAVE_AF_PACKET
if (!af_packet || (d = socket(AF_PACKET, SOCK_DGRAM, 0)) < 0)
#endif
{
af_packet = 0;
if ((d = socket(AF_INET, SOCK_PACKET, htons(ETH_P_ALL))) < 0) {
mon_syslog(LOG_ERR, "Could not get socket to do packet monitoring: %m");
return -1;
}
}
fcntl(d, F_SETFD, FD_CLOEXEC);
#ifdef HAVE_AF_PACKET
if (af_packet) {
struct ifreq ifr;
struct sockaddr_ll to;
strncpy(ifr.ifr_name, proxydev, IFNAMSIZ);
if (ioctl(d, SIOCGIFINDEX, &ifr) < 0) {
mon_syslog(LOG_ERR, "Proxy interface %s: %m", proxydev);
close(d);
return -1;
}
current_proxy_index = ifr.ifr_ifindex;
memset(&to, 0, sizeof(to));
to.sll_family = AF_PACKET;
to.sll_protocol = htons(ETH_P_ALL);
to.sll_ifindex = ifr.ifr_ifindex;
if (bind(d, (struct sockaddr *)&to, sizeof(to)) < 0) {
mon_syslog(LOG_ERR, "Bind to proxy interface %s: %m", proxydev);
close(d);
return -1;
}
} else
#endif
{
struct sockaddr to;
to.sa_family = AF_INET;
strcpy(to.sa_data, proxydev);
if (bind(d, (struct sockaddr *)&to, sizeof(to)) < 0) {
mon_syslog(LOG_ERR, "Bind to proxy interface %s: %m", proxydev);
close(d);
return -1;
}
}
current_proxy = proxydev;
n = strcspn(proxydev, "0123456789" );
proxy->ifunit = atoi(proxydev + n);
if (n > sizeof(proxy->iftype)-1)
n = sizeof(proxy->iftype)-1;
strncpy(proxy->iftype, proxydev, n);
proxy->iftype[n] = '\0';
proxy->send = proxy_dev_send;
proxy->recv = proxy_dev_recv;
proxy->init = proxy_dev_init;
proxy->start = proxy_dev_start;
proxy->stop = proxy_dev_stop;
proxy->close = proxy_dev_close;
proxy->release = proxy_dev_release;
proxy->fd = d;
return n;
}
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