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