1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
4 */
5
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <errno.h>
9 #include <termios.h>
10 #include <unistd.h>
11 #include <netinet/in.h>
12 #include "chan_user.h"
13 #include <os.h>
14 #include "port.h"
15 #include <um_malloc.h>
16
17 struct port_chan {
18 int raw;
19 struct termios tt;
20 void *kernel_data;
21 char dev[sizeof("32768\0")];
22 };
23
port_init(char * str,int device,const struct chan_opts * opts)24 static void *port_init(char *str, int device, const struct chan_opts *opts)
25 {
26 struct port_chan *data;
27 void *kern_data;
28 char *end;
29 int port;
30
31 if (*str != ':') {
32 printk(UM_KERN_ERR "port_init : channel type 'port' must "
33 "specify a port number\n");
34 return NULL;
35 }
36 str++;
37 port = strtoul(str, &end, 0);
38 if ((*end != '\0') || (end == str)) {
39 printk(UM_KERN_ERR "port_init : couldn't parse port '%s'\n",
40 str);
41 return NULL;
42 }
43
44 kern_data = port_data(port);
45 if (kern_data == NULL)
46 return NULL;
47
48 data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
49 if (data == NULL)
50 goto err;
51
52 *data = ((struct port_chan) { .raw = opts->raw,
53 .kernel_data = kern_data });
54 sprintf(data->dev, "%d", port);
55
56 return data;
57 err:
58 port_kern_free(kern_data);
59 return NULL;
60 }
61
port_free(void * d)62 static void port_free(void *d)
63 {
64 struct port_chan *data = d;
65
66 port_kern_free(data->kernel_data);
67 kfree(data);
68 }
69
port_open(int input,int output,int primary,void * d,char ** dev_out)70 static int port_open(int input, int output, int primary, void *d,
71 char **dev_out)
72 {
73 struct port_chan *data = d;
74 int fd, err;
75
76 fd = port_wait(data->kernel_data);
77 if ((fd >= 0) && data->raw) {
78 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
79 if (err)
80 return err;
81
82 err = raw(fd);
83 if (err)
84 return err;
85 }
86 *dev_out = data->dev;
87 return fd;
88 }
89
port_close(int fd,void * d)90 static void port_close(int fd, void *d)
91 {
92 struct port_chan *data = d;
93
94 port_remove_dev(data->kernel_data);
95 os_close_file(fd);
96 }
97
98 const struct chan_ops port_ops = {
99 .type = "port",
100 .init = port_init,
101 .open = port_open,
102 .close = port_close,
103 .read = generic_read,
104 .write = generic_write,
105 .console_write = generic_console_write,
106 .window_size = generic_window_size,
107 .free = port_free,
108 .winch = 1,
109 };
110
port_listen_fd(int port)111 int port_listen_fd(int port)
112 {
113 struct sockaddr_in addr;
114 int fd, err, arg;
115
116 fd = socket(PF_INET, SOCK_STREAM, 0);
117 if (fd == -1)
118 return -errno;
119
120 arg = 1;
121 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0) {
122 err = -errno;
123 goto out;
124 }
125
126 addr.sin_family = AF_INET;
127 addr.sin_port = htons(port);
128 addr.sin_addr.s_addr = htonl(INADDR_ANY);
129 if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
130 err = -errno;
131 goto out;
132 }
133
134 if (listen(fd, 1) < 0) {
135 err = -errno;
136 goto out;
137 }
138
139 err = os_set_fd_block(fd, 0);
140 if (err < 0)
141 goto out;
142
143 return fd;
144 out:
145 close(fd);
146 return err;
147 }
148
149 struct port_pre_exec_data {
150 int sock_fd;
151 int pipe_fd;
152 };
153
port_pre_exec(void * arg)154 static void port_pre_exec(void *arg)
155 {
156 struct port_pre_exec_data *data = arg;
157
158 dup2(data->sock_fd, 0);
159 dup2(data->sock_fd, 1);
160 dup2(data->sock_fd, 2);
161 close(data->sock_fd);
162 dup2(data->pipe_fd, 3);
163 shutdown(3, SHUT_RD);
164 close(data->pipe_fd);
165 }
166
port_connection(int fd,int * socket,int * pid_out)167 int port_connection(int fd, int *socket, int *pid_out)
168 {
169 int new, err;
170 char *argv[] = { "/usr/sbin/in.telnetd", "-L",
171 OS_LIB_PATH "/uml/port-helper", NULL };
172 struct port_pre_exec_data data;
173
174 new = accept(fd, NULL, 0);
175 if (new < 0)
176 return -errno;
177
178 err = os_pipe(socket, 0, 0);
179 if (err < 0)
180 goto out_close;
181
182 data = ((struct port_pre_exec_data)
183 { .sock_fd = new,
184 .pipe_fd = socket[1] });
185
186 err = run_helper(port_pre_exec, &data, argv);
187 if (err < 0)
188 goto out_shutdown;
189
190 *pid_out = err;
191 return new;
192
193 out_shutdown:
194 shutdown(socket[0], SHUT_RDWR);
195 close(socket[0]);
196 shutdown(socket[1], SHUT_RDWR);
197 close(socket[1]);
198 out_close:
199 close(new);
200 return err;
201 }
202