arch/um/drivers/port_user.c

   1 /*
   2  * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <stddef.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include <unistd.h>
  12 #include <termios.h>
  13 #include <sys/socket.h>
  14 #include <sys/un.h>
  15 #include <netinet/in.h>
  16 #include "user_util.h"
  17 #include "kern_util.h"
  18 #include "user.h"
  19 #include "chan_user.h"
  20 #include "port.h"
  21 #include "os.h"
  22
  23 struct port_chan {
  24         int raw;
  25         struct termios tt;
  26         void *kernel_data;
  27         char dev[sizeof("32768\0")];
  28 };
  29
  30 static void *port_init(char *str, int device, struct chan_opts *opts)
  31 {
  32         struct port_chan *data;
  33         void *kern_data;
  34         char *end;
  35         int port;
  36
  37         if(*str != ':'){
  38                 printk("port_init : channel type 'port' must specify a "
  39                        "port number\n");
  40                 return(NULL);
  41         }
  42         str++;
  43         port = strtoul(str, &end, 0);
  44         if((*end != '\0') || (end == str)){
  45                 printk("port_init : couldn't parse port '%s'\n", str);
  46                 return(NULL);
  47         }
  48
  49         kern_data = port_data(port);
  50         if(kern_data == NULL)
  51                 return(NULL);
  52
  53         data = um_kmalloc(sizeof(*data));
  54         if(data == NULL)
  55                 goto err;
  56
  57         *data = ((struct port_chan) { .raw              = opts->raw,
  58                                       .kernel_data      = kern_data });
  59         sprintf(data->dev, "%d", port);
  60
  61         return(data);
  62  err:
  63         port_kern_free(kern_data);
  64         return(NULL);
  65 }
  66
  67 static void port_free(void *d)
  68 {
  69         struct port_chan *data = d;
  70
  71         port_kern_free(data->kernel_data);
  72         kfree(data);
  73 }
  74
  75 static int port_open(int input, int output, int primary, void *d,
  76                      char **dev_out)
  77 {
  78         struct port_chan *data = d;
  79         int fd, err;
  80
  81         fd = port_wait(data->kernel_data);
  82         if((fd >= 0) && data->raw){
  83                 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
  84                 if(err)
  85                         return(err);
  86
  87                 err = raw(fd);
  88                 if(err)
  89                         return(err);
  90         }
  91         *dev_out = data->dev;
  92         return(fd);
  93 }
  94
  95 static void port_close(int fd, void *d)
  96 {
  97         struct port_chan *data = d;
  98
  99         port_remove_dev(data->kernel_data);
 100         os_close_file(fd);
 101 }
 102
 103 struct chan_ops port_ops = {
 104         .type           = "port",
 105         .init           = port_init,
 106         .open           = port_open,
 107         .close          = port_close,
 108         .read           = generic_read,
 109         .write          = generic_write,
 110         .console_write  = generic_console_write,
 111         .window_size    = generic_window_size,
 112         .free           = port_free,
 113         .winch          = 1,
 114 };
 115
 116 int port_listen_fd(int port)
 117 {
 118         struct sockaddr_in addr;
 119         int fd, err, arg;
 120
 121         fd = socket(PF_INET, SOCK_STREAM, 0);
 122         if(fd == -1)
 123                 return(-errno);
 124
 125         arg = 1;
 126         if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0){
 127                 err = -errno;
 128                 goto out;
 129         }
 130
 131         addr.sin_family = AF_INET;
 132         addr.sin_port = htons(port);
 133         addr.sin_addr.s_addr = htonl(INADDR_ANY);
 134         if(bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0){
 135                 err = -errno;
 136                 goto out;
 137         }
 138
 139         if(listen(fd, 1) < 0){
 140                 err = -errno;
 141                 goto out;
 142         }
 143
 144         err = os_set_fd_block(fd, 0);
 145         if(err < 0)
 146                 goto out;
 147
 148         return(fd);
 149  out:
 150         os_close_file(fd);
 151         return(err);
 152 }
 153
 154 struct port_pre_exec_data {
 155         int sock_fd;
 156         int pipe_fd;
 157 };
 158
 159 void port_pre_exec(void *arg)
 160 {
 161         struct port_pre_exec_data *data = arg;
 162
 163         dup2(data->sock_fd, 0);
 164         dup2(data->sock_fd, 1);
 165         dup2(data->sock_fd, 2);
 166         os_close_file(data->sock_fd);
 167         dup2(data->pipe_fd, 3);
 168         os_shutdown_socket(3, 1, 0);
 169         os_close_file(data->pipe_fd);
 170 }
 171
 172 int port_connection(int fd, int *socket, int *pid_out)
 173 {
 174         int new, err;
 175         char *argv[] = { "/usr/sbin/in.telnetd", "-L",
 176                          "/usr/lib/uml/port-helper", NULL };
 177         struct port_pre_exec_data data;
 178
 179         new = os_accept_connection(fd);
 180         if(new < 0)
 181                 return(new);
 182
 183         err = os_pipe(socket, 0, 0);
 184         if(err < 0)
 185                 goto out_close;
 186
 187         data = ((struct port_pre_exec_data)
 188                 { .sock_fd              = new,
 189                   .pipe_fd              = socket[1] });
 190
 191         err = run_helper(port_pre_exec, &data, argv, NULL);
 192         if(err < 0)
 193                 goto out_shutdown;
 194
 195         *pid_out = err;
 196         return(new);
 197
 198  out_shutdown:
 199         os_shutdown_socket(socket[0], 1, 1);
 200         os_close_file(socket[0]);
 201         os_shutdown_socket(socket[1], 1, 1);
 202         os_close_file(socket[1]);
 203  out_close:
 204         os_close_file(new);
 205         return(err);
 206 }
 207
 208 /*
 209  * Overrides for Emacs so that we follow Linus's tabbing style.
 210  * Emacs will notice this stuff at the end of the file and automatically
 211  * adjust the settings for this buffer only.  This must remain at the end
 212  * of the file.
 213  * ---------------------------------------------------------------------------
 214  * Local variables:
 215  * c-file-style: "linux"
 216  * End:
 217  */