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/* Copyright 2001, 2002 Jeff Dike and others
* Licensed under the GPL
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/ioctl.h>
#include "host.h"
#include "output.h"
static void slip_up(int fd, char *gate_addr, char *remote_addr,
char *netmask, struct output *output)
{
char slip_name[sizeof("slxxxx\0")];
char *up_argv[] = { "ifconfig", slip_name, gate_addr, "mtu", "1500", "up",
NULL };
int disc, sencap, n;
disc = N_SLIP;
if((n = ioctl(fd, TIOCSETD, &disc)) < 0){
output_errno(output, "Setting slip line discipline");
write_output(1, output);
exit(1);
}
sencap = 0;
if(ioctl(fd, SIOCSIFENCAP, &sencap) < 0){
output_errno(output, "Setting slip encapsulation");
write_output(1, output);
exit(1);
}
snprintf(slip_name, sizeof(slip_name) - 1, "sl%d", n);
if(do_exec(up_argv, 1, output)){
write_output(1, output);
exit(1);
}
forward_ip(output);
if(remote_addr != NULL)
route_and_arp(slip_name, remote_addr, netmask, 0, output);
}
static void slip_down(char *dev, char *remote_addr, char *netmask,
struct output *output)
{
char *down_argv[] = { "ifconfig", dev, "0.0.0.0", "down", NULL };
if(remote_addr != NULL)
no_route_and_arp(dev, remote_addr, netmask, output);
if(do_exec(down_argv, 1, output)){
write_output(1, output);
exit(1);
}
}
static void slip_name(int fd, char *name, struct output *output)
{
if(ioctl(fd, SIOCGIFNAME, name) < 0){
output_errno(output, "Getting slip line discipline");
write_output(1, output);
exit(1);
}
}
void slip_v0_v2(int argc, char **argv)
{
char *op = argv[0], dev[sizeof("slnnnnn\0")];
if(setreuid(0, 0) < 0){
perror("slip - setreuid failed");
exit(1);
}
if(!strcmp(op, "up"))
slip_up(atoi(argv[1]), argv[2], argv[3], NULL, NULL);
else if(!strcmp(op, "down")){
slip_name(atoi(argv[1]), dev, NULL);
slip_down(dev, argv[2], NULL, NULL);
}
else {
printf("slip - Unknown op '%s'\n", op);
exit(1);
}
}
void slip_v3(int argc, char **argv)
{
struct output output = INIT_OUTPUT;
char *op = argv[0], dev[sizeof("slnnnnn\0")];
if(setreuid(0, 0) < 0){
output_errno(&output, "slip - setreuid failed");
exit(1);
}
if(!strcmp(op, "up"))
slip_up(atoi(argv[1]), argv[2], argv[3], NULL, &output);
else if(!strcmp(op, "down")){
slip_name(atoi(argv[1]), dev, &output);
slip_down(dev, argv[2], NULL, &output);
}
else {
printf("slip - Unknown op '%s'\n", op);
exit(1);
}
write_output(1, &output);
}
void slip_v4(int argc, char **argv)
{
struct output output = INIT_OUTPUT;
char *op, dev[sizeof("slnnnnn\0")];
if(setreuid(0, 0) < 0){
output_errno(&output, "slip - setreuid failed");
exit(1);
}
if(argc < 1){
add_output(&output, "uml_net : too few arguments to slip_v4\n", -1);
write_output(1, &output);
exit(1);
}
op = argv[0];
if(argc < 2){
add_output(&output, "uml_net : too few arguments to slip_v4\n", -1);
write_output(1, &output);
exit(1);
}
if(!strcmp(op, "up")){
slip_up(0, argv[1], NULL, NULL, &output);
}
else if(!strcmp(op, "down")){
/* We now pass the interface to the "down" command as an open FD, rather
* than as a name, because the latter allowed anybody to use uml_net to down
* a interface he didn't own.
*
* Instead, as Steve Schmidtke said, an open FD is a proof that you own the
* interface, so this way we should be safe. */
slip_name(0, dev, &output);
slip_down(dev, NULL, NULL, &output);
}
else {
printf("slip - Unknown op '%s'\n", op);
exit(1);
}
write_output(1, &output);
}
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