1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <unistd.h>
7*4882a593Smuzhiyun #include <errno.h>
8*4882a593Smuzhiyun #include <string.h>
9*4882a593Smuzhiyun #include <sys/wait.h>
10*4882a593Smuzhiyun #include <net_user.h>
11*4882a593Smuzhiyun #include <os.h>
12*4882a593Smuzhiyun #include "slirp.h"
13*4882a593Smuzhiyun
slirp_user_init(void * data,void * dev)14*4882a593Smuzhiyun static int slirp_user_init(void *data, void *dev)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun struct slirp_data *pri = data;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun pri->dev = dev;
19*4882a593Smuzhiyun return 0;
20*4882a593Smuzhiyun }
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun struct slirp_pre_exec_data {
23*4882a593Smuzhiyun int stdin_fd;
24*4882a593Smuzhiyun int stdout_fd;
25*4882a593Smuzhiyun };
26*4882a593Smuzhiyun
slirp_pre_exec(void * arg)27*4882a593Smuzhiyun static void slirp_pre_exec(void *arg)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct slirp_pre_exec_data *data = arg;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun if (data->stdin_fd != -1)
32*4882a593Smuzhiyun dup2(data->stdin_fd, 0);
33*4882a593Smuzhiyun if (data->stdout_fd != -1)
34*4882a593Smuzhiyun dup2(data->stdout_fd, 1);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
slirp_tramp(char ** argv,int fd)37*4882a593Smuzhiyun static int slirp_tramp(char **argv, int fd)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun struct slirp_pre_exec_data pe_data;
40*4882a593Smuzhiyun int pid;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun pe_data.stdin_fd = fd;
43*4882a593Smuzhiyun pe_data.stdout_fd = fd;
44*4882a593Smuzhiyun pid = run_helper(slirp_pre_exec, &pe_data, argv);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun return pid;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
slirp_open(void * data)49*4882a593Smuzhiyun static int slirp_open(void *data)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun struct slirp_data *pri = data;
52*4882a593Smuzhiyun int fds[2], pid, err;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun err = os_pipe(fds, 1, 1);
55*4882a593Smuzhiyun if (err)
56*4882a593Smuzhiyun return err;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun err = slirp_tramp(pri->argw.argv, fds[1]);
59*4882a593Smuzhiyun if (err < 0) {
60*4882a593Smuzhiyun printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
61*4882a593Smuzhiyun goto out;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun pid = err;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun pri->slave = fds[1];
66*4882a593Smuzhiyun pri->slip.pos = 0;
67*4882a593Smuzhiyun pri->slip.esc = 0;
68*4882a593Smuzhiyun pri->pid = err;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun return fds[0];
71*4882a593Smuzhiyun out:
72*4882a593Smuzhiyun close(fds[0]);
73*4882a593Smuzhiyun close(fds[1]);
74*4882a593Smuzhiyun return err;
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
slirp_close(int fd,void * data)77*4882a593Smuzhiyun static void slirp_close(int fd, void *data)
78*4882a593Smuzhiyun {
79*4882a593Smuzhiyun struct slirp_data *pri = data;
80*4882a593Smuzhiyun int err;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun close(fd);
83*4882a593Smuzhiyun close(pri->slave);
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun pri->slave = -1;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun if (pri->pid<1) {
88*4882a593Smuzhiyun printk(UM_KERN_ERR "slirp_close: no child process to shut "
89*4882a593Smuzhiyun "down\n");
90*4882a593Smuzhiyun return;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun #if 0
94*4882a593Smuzhiyun if (kill(pri->pid, SIGHUP)<0) {
95*4882a593Smuzhiyun printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
96*4882a593Smuzhiyun "(%d)\n", pri->pid, errno);
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun #endif
99*4882a593Smuzhiyun err = helper_wait(pri->pid);
100*4882a593Smuzhiyun if (err < 0)
101*4882a593Smuzhiyun return;
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun pri->pid = -1;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun
slirp_user_read(int fd,void * buf,int len,struct slirp_data * pri)106*4882a593Smuzhiyun int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
107*4882a593Smuzhiyun {
108*4882a593Smuzhiyun return slip_proto_read(fd, buf, len, &pri->slip);
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
slirp_user_write(int fd,void * buf,int len,struct slirp_data * pri)111*4882a593Smuzhiyun int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
112*4882a593Smuzhiyun {
113*4882a593Smuzhiyun return slip_proto_write(fd, buf, len, &pri->slip);
114*4882a593Smuzhiyun }
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun const struct net_user_info slirp_user_info = {
117*4882a593Smuzhiyun .init = slirp_user_init,
118*4882a593Smuzhiyun .open = slirp_open,
119*4882a593Smuzhiyun .close = slirp_close,
120*4882a593Smuzhiyun .remove = NULL,
121*4882a593Smuzhiyun .add_address = NULL,
122*4882a593Smuzhiyun .delete_address = NULL,
123*4882a593Smuzhiyun .mtu = BUF_SIZE,
124*4882a593Smuzhiyun .max_packet = BUF_SIZE,
125*4882a593Smuzhiyun };
126