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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <sched.h>
#include <string.h>
#include <errno.h>
#include <sys/termios.h>
#include <sys/wait.h>
#include <sys/signal.h>
#include "kern_util.h"
#include "user.h"
#include "net_user.h"
#include "slip.h"
#include "slip_common.h"
#include "os.h"
#include "um_malloc.h"
#include "kern_constants.h"
static int slip_user_init(void *data, void *dev)
{
struct slip_data *pri = data;
pri->dev = dev;
return 0;
}
static int set_up_tty(int fd)
{
int i;
struct termios tios;
if (tcgetattr(fd, &tios) < 0) {
printk("could not get initial terminal attributes\n");
return(-1);
}
tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
tios.c_iflag = IGNBRK | IGNPAR;
tios.c_oflag = 0;
tios.c_lflag = 0;
for (i = 0; i < NCCS; i++)
tios.c_cc[i] = 0;
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
cfsetospeed(&tios, B38400);
cfsetispeed(&tios, B38400);
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
printk("failed to set terminal attributes\n");
return(-1);
}
return(0);
}
struct slip_pre_exec_data {
int stdin;
int stdout;
int close_me;
};
static void slip_pre_exec(void *arg)
{
struct slip_pre_exec_data *data = arg;
if(data->stdin >= 0) dup2(data->stdin, 0);
dup2(data->stdout, 1);
if(data->close_me >= 0) os_close_file(data->close_me);
}
static int slip_tramp(char **argv, int fd)
{
struct slip_pre_exec_data pe_data;
char *output;
int status, pid, fds[2], err, output_len;
err = os_pipe(fds, 1, 0);
if(err < 0){
printk("slip_tramp : pipe failed, err = %d\n", -err);
goto out;
}
err = 0;
pe_data.stdin = fd;
pe_data.stdout = fds[1];
pe_data.close_me = fds[0];
err = run_helper(slip_pre_exec, &pe_data, argv);
if(err < 0)
goto out_close;
pid = err;
output_len = UM_KERN_PAGE_SIZE;
output = kmalloc(output_len, UM_GFP_KERNEL);
if(output == NULL){
printk("slip_tramp : failed to allocate output buffer\n");
os_kill_process(pid, 1);
err = -ENOMEM;
goto out_free;
}
os_close_file(fds[1]);
read_output(fds[0], output, output_len);
printk("%s", output);
CATCH_EINTR(err = waitpid(pid, &status, 0));
if(err < 0)
err = errno;
else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
printk("'%s' didn't exit with status 0\n", argv[0]);
err = -EINVAL;
}
else err = 0;
os_close_file(fds[0]);
out_free:
kfree(output);
return err;
out_close:
os_close_file(fds[0]);
os_close_file(fds[1]);
out:
return err;
}
static int slip_open(void *data)
{
struct slip_data *pri = data;
char version_buf[sizeof("nnnnn\0")];
char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
NULL };
int sfd, mfd, err;
err = get_pty();
if(err < 0){
printk("slip-open : Failed to open pty, err = %d\n", -err);
goto out;
}
mfd = err;
err = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0);
if(err < 0){
printk("Couldn't open tty for slip line, err = %d\n", -err);
goto out_close;
}
sfd = err;
if(set_up_tty(sfd))
goto out_close2;
pri->slave = sfd;
pri->slip.pos = 0;
pri->slip.esc = 0;
if(pri->gate_addr != NULL){
sprintf(version_buf, "%d", UML_NET_VERSION);
strcpy(gate_buf, pri->gate_addr);
err = slip_tramp(argv, sfd);
if(err < 0){
printk("slip_tramp failed - err = %d\n", -err);
goto out_close2;
}
err = os_get_ifname(pri->slave, pri->name);
if(err < 0){
printk("get_ifname failed, err = %d\n", -err);
goto out_close2;
}
iter_addresses(pri->dev, open_addr, pri->name);
}
else {
err = os_set_slip(sfd);
if(err < 0){
printk("Failed to set slip discipline encapsulation - "
"err = %d\n", -err);
goto out_close2;
}
}
return(mfd);
out_close2:
os_close_file(sfd);
out_close:
os_close_file(mfd);
out:
return err;
}
static void slip_close(int fd, void *data)
{
struct slip_data *pri = data;
char version_buf[sizeof("nnnnn\0")];
char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
NULL };
int err;
if(pri->gate_addr != NULL)
iter_addresses(pri->dev, close_addr, pri->name);
sprintf(version_buf, "%d", UML_NET_VERSION);
err = slip_tramp(argv, pri->slave);
if(err != 0)
printk("slip_tramp failed - errno = %d\n", -err);
os_close_file(fd);
os_close_file(pri->slave);
pri->slave = -1;
}
int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
{
return slip_proto_read(fd, buf, len, &pri->slip);
}
int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
{
return slip_proto_write(fd, buf, len, &pri->slip);
}
static int slip_set_mtu(int mtu, void *data)
{
return(mtu);
}
static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
void *data)
{
struct slip_data *pri = data;
if(pri->slave < 0) return;
open_addr(addr, netmask, pri->name);
}
static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
void *data)
{
struct slip_data *pri = data;
if(pri->slave < 0) return;
close_addr(addr, netmask, pri->name);
}
const struct net_user_info slip_user_info = {
.init = slip_user_init,
.open = slip_open,
.close = slip_close,
.remove = NULL,
.set_mtu = slip_set_mtu,
.add_address = slip_add_addr,
.delete_address = slip_del_addr,
.max_packet = BUF_SIZE
};
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