linux/arch/um/drivers/port_user.c
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   1/*
   2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
   3 * Licensed under the GPL
   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
  17struct port_chan {
  18        int raw;
  19        struct termios tt;
  20        void *kernel_data;
  21        char dev[sizeof("32768\0")];
  22};
  23
  24static 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
  62static 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
  70static 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
  90static 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
  98const 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
 111int 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
 149struct port_pre_exec_data {
 150        int sock_fd;
 151        int pipe_fd;
 152};
 153
 154static 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
 167int port_connection(int fd, int *socket, int *pid_out)
 168{
 169        int new, err;
 170        char *argv[] = { "/usr/sbin/in.telnetd", "-L",
 171                         "/usr/lib/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
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