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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*/
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include <net_user.h>
#include <os.h>
#include "slirp.h"
static int slirp_user_init(void *data, void *dev)
{
struct slirp_data *pri = data;
pri->dev = dev;
return 0;
}
struct slirp_pre_exec_data {
int stdin_fd;
int stdout_fd;
};
static void slirp_pre_exec(void *arg)
{
struct slirp_pre_exec_data *data = arg;
if (data->stdin_fd != -1)
dup2(data->stdin_fd, 0);
if (data->stdout_fd != -1)
dup2(data->stdout_fd, 1);
}
static int slirp_tramp(char **argv, int fd)
{
struct slirp_pre_exec_data pe_data;
int pid;
pe_data.stdin_fd = fd;
pe_data.stdout_fd = fd;
pid = run_helper(slirp_pre_exec, &pe_data, argv);
return pid;
}
static int slirp_open(void *data)
{
struct slirp_data *pri = data;
int fds[2], pid, err;
err = os_pipe(fds, 1, 1);
if (err)
return err;
err = slirp_tramp(pri->argw.argv, fds[1]);
if (err < 0) {
printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
goto out;
}
pid = err;
pri->slave = fds[1];
pri->slip.pos = 0;
pri->slip.esc = 0;
pri->pid = err;
return fds[0];
out:
close(fds[0]);
close(fds[1]);
return err;
}
static void slirp_close(int fd, void *data)
{
struct slirp_data *pri = data;
int err;
close(fd);
close(pri->slave);
pri->slave = -1;
if (pri->pid<1) {
printk(UM_KERN_ERR "slirp_close: no child process to shut "
"down\n");
return;
}
#if 0
if (kill(pri->pid, SIGHUP)<0) {
printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
"(%d)\n", pri->pid, errno);
}
#endif
err = helper_wait(pri->pid);
if (err < 0)
return;
pri->pid = -1;
}
int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
{
return slip_proto_read(fd, buf, len, &pri->slip);
}
int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
{
return slip_proto_write(fd, buf, len, &pri->slip);
}
const struct net_user_info slirp_user_info = {
.init = slirp_user_init,
.open = slirp_open,
.close = slirp_close,
.remove = NULL,
.add_address = NULL,
.delete_address = NULL,
.mtu = BUF_SIZE,
.max_packet = BUF_SIZE,
};
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