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], err;
53
54 err = os_pipe(fds, 1, 1);
55 if (err)
56 return err;
57
58 err = slirp_tramp(pri->argw.argv, fds[1]);
59 if (err < 0) {
60 printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
61 goto out;
62 }
63
64 pri->slave = fds[1];
65 pri->slip.pos = 0;
66 pri->slip.esc = 0;
67 pri->pid = err;
68
69 return fds[0];
70 out:
71 close(fds[0]);
72 close(fds[1]);
73 return err;
74 }
75
76 static void slirp_close(int fd, void *data)
77 {
78 struct slirp_data *pri = data;
79 int err;
80
81 close(fd);
82 close(pri->slave);
83
84 pri->slave = -1;
85
86 if (pri->pid<1) {
87 printk(UM_KERN_ERR "slirp_close: no child process to shut "
88 "down\n");
89 return;
90 }
91
92 #if 0
93 if (kill(pri->pid, SIGHUP)<0) {
94 printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
95 "(%d)\n", pri->pid, errno);
96 }
97 #endif
98 err = helper_wait(pri->pid);
99 if (err < 0)
100 return;
101
102 pri->pid = -1;
103 }
104
105 int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
106 {
107 return slip_proto_read(fd, buf, len, &pri->slip);
108 }
109
110 int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
111 {
112 return slip_proto_write(fd, buf, len, &pri->slip);
113 }
114
115 const struct net_user_info slirp_user_info = {
116 .init = slirp_user_init,
117 .open = slirp_open,
118 .close = slirp_close,
119 .remove = NULL,
120 .add_address = NULL,
121 .delete_address = NULL,
122 .mtu = BUF_SIZE,
123 .max_packet = BUF_SIZE,
124 };
125
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