1 /*
2 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL.
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
slirp_user_init(void * data,void * dev)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
slirp_pre_exec(void * arg)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
slirp_tramp(char ** argv,int fd)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
slirp_open(void * data)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(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 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
slirp_close(int fd,void * data)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
slirp_user_read(int fd,void * buf,int len,struct slirp_data * pri)106 int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
107 {
108 return slip_proto_read(fd, buf, len, &pri->slip);
109 }
110
slirp_user_write(int fd,void * buf,int len,struct slirp_data * pri)111 int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
112 {
113 return slip_proto_write(fd, buf, len, &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