errsock.c

/*
 * A dummy Socket implementation which just holds an error message.
 */

#include <stdio.h>
#include <assert.h>

#define DEFINE_PLUG_METHOD_MACROS
#include "tree234.h"
#include "putty.h"
#include "network.h"

typedef struct Socket_error_tag *Error_Socket;

struct Socket_error_tag {
  const struct socket_function_table *fn;
  /* the above variable absolutely *must* be the first in this structure */

  char *error;
  Plug plug;
};

static Plug sk_error_plug(Socket s, Plug p)
{
  Error_Socket ps = (Error_Socket)s;
  Plug ret = ps->plug;
  if (p)
    ps->plug = p;
  return ret;
}

static void sk_error_close(Socket s)
{
  Error_Socket ps = (Error_Socket)s;

  sfree(ps->error);
  sfree(ps);
}

static const char *sk_error_socket_error(Socket s)
{
  Error_Socket ps = (Error_Socket)s;
  return ps->error;
}

static char *sk_error_peer_info(Socket s)
{
  return NULL;
}

Socket new_error_socket(const char *errmsg, Plug plug)
{
  static const struct socket_function_table socket_fn_table = {
      sk_error_plug,
      sk_error_close,
      NULL /* write */,
      NULL /* write_oob */,
      NULL /* write_eof */,
      NULL /* flush */,
      NULL /* set_frozen */,
      sk_error_socket_error,
      sk_error_peer_info,
  };

  Error_Socket ret;

  ret = snew(struct Socket_error_tag);
  ret->fn = &socket_fn_table;
  ret->plug = plug;
  ret->error = dupstr(errmsg);

  return (Socket)ret;
}