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slirp_user.c

/*
 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL.
 */

#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
#include "kern_constants.h"
#include "net_user.h"
#include "os.h"
#include "slirp.h"
#include "user.h"

static int slirp_user_init(void *data, void *dev)
{
      struct slirp_data *pri = data;

      pri->dev = dev;
      return 0;
}

struct slirp_pre_exec_data {
      int stdin;
      int stdout;
};

static void slirp_pre_exec(void *arg)
{
      struct slirp_pre_exec_data *data = arg;

      if (data->stdin != -1)
            dup2(data->stdin, 0);
      if (data->stdout != -1)
            dup2(data->stdout, 1);
}

static int slirp_tramp(char **argv, int fd)
{
      struct slirp_pre_exec_data pe_data;
      int pid;

      pe_data.stdin = fd;
      pe_data.stdout = fd;
      pid = run_helper(slirp_pre_exec, &pe_data, argv);

      return pid;
}

static int slirp_open(void *data)
{
      struct slirp_data *pri = data;
      int fds[2], pid, err;

      err = os_pipe(fds, 1, 1);
      if (err)
            return err;

      err = slirp_tramp(pri->argw.argv, fds[1]);
      if (err < 0) {
            printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
            goto out;
      }
      pid = err;

      pri->slave = fds[1];
      pri->slip.pos = 0;
      pri->slip.esc = 0;
      pri->pid = err;

      return fds[0];
out:
      close(fds[0]);
      close(fds[1]);
      return err;
}

static void slirp_close(int fd, void *data)
{
      struct slirp_data *pri = data;
      int err;

      close(fd);
      close(pri->slave);

      pri->slave = -1;

      if (pri->pid<1) {
            printk(UM_KERN_ERR "slirp_close: no child process to shut "
                   "down\n");
            return;
      }

#if 0
      if (kill(pri->pid, SIGHUP)<0) {
            printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
                   "(%d)\n", pri->pid, errno);
      }
#endif
      err = helper_wait(pri->pid);
      if (err < 0)
            return;

      pri->pid = -1;
}

int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
{
      return slip_proto_read(fd, buf, len, &pri->slip);
}

int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
{
      return slip_proto_write(fd, buf, len, &pri->slip);
}

const struct net_user_info slirp_user_info = {
      .init       = slirp_user_init,
      .open       = slirp_open,
      .close            = slirp_close,
      .remove           = NULL,
      .add_address      = NULL,
      .delete_address = NULL,
      .mtu        = BUF_SIZE,
      .max_packet = BUF_SIZE,
};

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