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 #include "um_malloc.h"
  23
  24 struct port_chan {
  25         int raw;
  26         struct termios tt;
  27         void *kernel_data;
  28         char dev[sizeof("32768\0")];
  29 };
  30
  31 static void *port_init(char *str, int device, const struct chan_opts *opts)
  32 {
  33         struct port_chan *data;
  34         void *kern_data;
  35         char *end;
  36         int port;
  37
  38         if(*str != ':'){
  39                 printk("port_init : channel type 'port' must specify a "
  40                        "port number\n");
  41                 return(NULL);
  42         }
  43         str++;
  44         port = strtoul(str, &end, 0);
  45         if((*end != '\0') || (end == str)){
  46                 printk("port_init : couldn't parse port '%s'\n", str);
  47                 return(NULL);
  48         }
  49
  50         kern_data = port_data(port);
  51         if(kern_data == NULL)
  52                 return(NULL);
  53
  54         data = um_kmalloc(sizeof(*data));
  55         if(data == NULL)
  56                 goto err;
  57
  58         *data = ((struct port_chan) { .raw              = opts->raw,
  59                                       .kernel_data      = kern_data });
  60         sprintf(data->dev, "%d", port);
  61
  62         return(data);
  63  err:
  64         port_kern_free(kern_data);
  65         return(NULL);
  66 }
  67
  68 static void port_free(void *d)
  69 {
  70         struct port_chan *data = d;
  71
  72         port_kern_free(data->kernel_data);
  73         kfree(data);
  74 }
  75
  76 static int port_open(int input, int output, int primary, void *d,
  77                      char **dev_out)
  78 {
  79         struct port_chan *data = d;
  80         int fd, err;
  81
  82         fd = port_wait(data->kernel_data);
  83         if((fd >= 0) && data->raw){
  84                 CATCH_EINTR(err = tcgetattr(fd, &data->tt));
  85                 if(err)
  86                         return(err);
  87
  88                 err = raw(fd);
  89                 if(err)
  90                         return(err);
  91         }
  92         *dev_out = data->dev;
  93         return(fd);
  94 }
  95
  96 static void port_close(int fd, void *d)
  97 {
  98         struct port_chan *data = d;
  99
 100         port_remove_dev(data->kernel_data);
 101         os_close_file(fd);
 102 }
 103
 104 const struct chan_ops port_ops = {
 105         .type           = "port",
 106         .init           = port_init,
 107         .open           = port_open,
 108         .close          = port_close,
 109         .read           = generic_read,
 110         .write          = generic_write,
 111         .console_write  = generic_console_write,
 112         .window_size    = generic_window_size,
 113         .free           = port_free,
 114         .winch          = 1,
 115 };
 116
 117 int port_listen_fd(int port)
 118 {
 119         struct sockaddr_in addr;
 120         int fd, err, arg;
 121
 122         fd = socket(PF_INET, SOCK_STREAM, 0);
 123         if(fd == -1)
 124                 return(-errno);
 125
 126         arg = 1;
 127         if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0){
 128                 err = -errno;
 129                 goto out;
 130         }
 131
 132         addr.sin_family = AF_INET;
 133         addr.sin_port = htons(port);
 134         addr.sin_addr.s_addr = htonl(INADDR_ANY);
 135         if(bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0){
 136                 err = -errno;
 137                 goto out;
 138         }
 139
 140         if(listen(fd, 1) < 0){
 141                 err = -errno;
 142                 goto out;
 143         }
 144
 145         err = os_set_fd_block(fd, 0);
 146         if(err < 0)
 147                 goto out;
 148
 149         return(fd);
 150  out:
 151         os_close_file(fd);
 152         return(err);
 153 }
 154
 155 struct port_pre_exec_data {
 156         int sock_fd;
 157         int pipe_fd;
 158 };
 159
 160 void port_pre_exec(void *arg)
 161 {
 162         struct port_pre_exec_data *data = arg;
 163
 164         dup2(data->sock_fd, 0);
 165         dup2(data->sock_fd, 1);
 166         dup2(data->sock_fd, 2);
 167         os_close_file(data->sock_fd);
 168         dup2(data->pipe_fd, 3);
 169         os_shutdown_socket(3, 1, 0);
 170         os_close_file(data->pipe_fd);
 171 }
 172
 173 int port_connection(int fd, int *socket, int *pid_out)
 174 {
 175         int new, err;
 176         char *argv[] = { "/usr/sbin/in.telnetd", "-L",
 177                          "/usr/lib/uml/port-helper", NULL };
 178         struct port_pre_exec_data data;
 179
 180         new = os_accept_connection(fd);
 181         if(new < 0)
 182                 return(new);
 183
 184         err = os_pipe(socket, 0, 0);
 185         if(err < 0)
 186                 goto out_close;
 187
 188         data = ((struct port_pre_exec_data)
 189                 { .sock_fd              = new,
 190                   .pipe_fd              = socket[1] });
 191
 192         err = run_helper(port_pre_exec, &data, argv, NULL);
 193         if(err < 0)
 194                 goto out_shutdown;
 195
 196         *pid_out = err;
 197         return(new);
 198
 199  out_shutdown:
 200         os_shutdown_socket(socket[0], 1, 1);
 201         os_close_file(socket[0]);
 202         os_shutdown_socket(socket[1], 1, 1);
 203         os_close_file(socket[1]);
 204  out_close:
 205         os_close_file(new);
 206         return(err);
 207 }
 208
 209 /*
 210  * Overrides for Emacs so that we follow Linus's tabbing style.
 211  * Emacs will notice this stuff at the end of the file and automatically
 212  * adjust the settings for this buffer only.  This must remain at the end
 213  * of the file.
 214  * ---------------------------------------------------------------------------
 215  * Local variables:
 216  * c-file-style: "linux"
 217  * End:
 218  */