Exemple #1
0
/** Read a 'packet' of data from a connection and process it.  Read in
 * 8k chunks to give a better performance rating (for server
 * connections).  Do some tricky stuff for client connections to make
 * sure they don't do any flooding >:-) -avalon
 * @param cptr Client from which to read data.
 * @param socket_ready If non-zero, more data can be read from the client's socket.
 * @return Positive number on success, zero on connection-fatal failure, negative
 *   if user is killed.
 */
static int read_packet(struct Client *cptr, int socket_ready)
{
  unsigned int dolen = 0;
  unsigned int length = 0;

  if (socket_ready &&
      !(IsUser(cptr) &&
	DBufLength(&(cli_recvQ(cptr))) > feature_uint(FEAT_CLIENT_FLOOD))) {
#if defined(USE_SSL)
    switch (client_recv(cptr, readbuf, sizeof(readbuf), &length)) {
#else
    switch (os_recv_nonb(cli_fd(cptr), readbuf, sizeof(readbuf), &length)) {
#endif
    case IO_SUCCESS:
      if (length)
      {
        cli_lasttime(cptr) = CurrentTime;
        ClearPingSent(cptr);
        ClrFlag(cptr, FLAG_NONL);
        if (cli_lasttime(cptr) > cli_since(cptr))
          cli_since(cptr) = cli_lasttime(cptr);
      }
      break;
    case IO_BLOCKED:
      break;
    case IO_FAILURE:
      cli_error(cptr) = errno;
      /* SetFlag(cptr, FLAG_DEADSOCKET); */
      return 0;
    }
  }

  /*
   * For server connections, we process as many as we can without
   * worrying about the time of day or anything :)
   */
  if (length > 0 && IsServer(cptr))
    return server_dopacket(cptr, readbuf, length);
  else if (length > 0 && (IsHandshake(cptr) || IsConnecting(cptr)))
    return connect_dopacket(cptr, readbuf, length);
  else
  {
    /*
     * Before we even think of parsing what we just read, stick
     * it on the end of the receive queue and do it when its
     * turn comes around.
     */
    if (length > 0 && dbuf_put(cptr, &(cli_recvQ(cptr)), readbuf, length) == 0)
      return exit_client(cptr, cptr, &me, "dbuf_put fail");

    if ((DBufLength(&(cli_recvQ(cptr))) > feature_uint(FEAT_CLIENT_FLOOD))
         && !IsChannelService(cptr))
      return exit_client(cptr, cptr, &me, "Excess Flood");

    while (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
           (IsTrusted(cptr) || IsChannelService(cptr) || cli_since(cptr) - CurrentTime < 10))
    {
      dolen = dbuf_getmsg(&(cli_recvQ(cptr)), cli_buffer(cptr), BUFSIZE);
      /*
       * Devious looking...whats it do ? well..if a client
       * sends a *long* message without any CR or LF, then
       * dbuf_getmsg fails and we pull it out using this
       * loop which just gets the next 512 bytes and then
       * deletes the rest of the buffer contents.
       * -avalon
       */
      if (dolen == 0)
      {
        if (DBufLength(&(cli_recvQ(cptr))) < 510)
          SetFlag(cptr, FLAG_NONL);
        else
        {
          /* More than 512 bytes in the line - drop the input and yell
           * at the client.
           */
          DBufClear(&(cli_recvQ(cptr)));
          send_reply(cptr, ERR_INPUTTOOLONG);
        }
      }
      else if (client_dopacket(cptr, dolen) == CPTR_KILLED)
        return CPTR_KILLED;
      /*
       * If it has become registered as a Server
       * then skip the per-message parsing below.
       */
      if (IsHandshake(cptr) || IsServer(cptr))
      {
        while (-1)
        {
          dolen = dbuf_get(&(cli_recvQ(cptr)), readbuf, sizeof(readbuf));
          if (dolen <= 0)
            return 1;
          else if (dolen == 0)
          {
            if (DBufLength(&(cli_recvQ(cptr))) < 510)
              SetFlag(cptr, FLAG_NONL);
            else {
              DBufClear(&(cli_recvQ(cptr)));
              /* send_reply(cptr, ERR_INPUTTOOLONG); */
            }
          }
          else if ((IsServer(cptr) &&
                    server_dopacket(cptr, readbuf, dolen) == CPTR_KILLED) ||
                   (!IsServer(cptr) &&
                    connect_dopacket(cptr, readbuf, dolen) == CPTR_KILLED))
            return CPTR_KILLED;
        }
      }
    }

    /* If there's still data to process, wait 2 seconds first */
    if (DBufLength(&(cli_recvQ(cptr))) && !NoNewLine(cptr) &&
	!t_onqueue(&(cli_proc(cptr))))
    {
      Debug((DEBUG_LIST, "Adding client process timer for %C", cptr));
      cli_freeflag(cptr) |= FREEFLAG_TIMER;
      timer_add(&(cli_proc(cptr)), client_timer_callback, cli_connect(cptr),
		TT_RELATIVE, 2);
    }
  }
  return 1;
}

/** Start a connection to another server.
 * @param aconf Connect block data for target server.
 * @param by Client who requested the connection (if any).
 * @return Non-zero on success; zero on failure.
 */
int connect_server(struct ConfItem* aconf, struct Client* by)
{
  struct Client*   cptr = 0;
  assert(0 != aconf);

  if (aconf->dns_pending) {
    sendto_opmask(0, SNO_OLDSNO, "Server %s connect DNS pending",
                  aconf->name);
    return 0;
  }
  Debug((DEBUG_NOTICE, "Connect to %s[@%s]", aconf->name,
         ircd_ntoa(&aconf->address.addr)));

  if ((cptr = FindClient(aconf->name))) {
    if (IsServer(cptr) || IsMe(cptr)) {
      sendto_opmask(0, SNO_OLDSNO, "Server %s already present from %s",
                    aconf->name, cli_name(cli_from(cptr)));
      if (by && IsUser(by) && !MyUser(by)) {
        sendcmdto_one(&me, CMD_NOTICE, by, "%C :Server %s already present "
                      "from %s", by, aconf->name, cli_name(cli_from(cptr)));
      }
      return 0;
    }
    else if (IsHandshake(cptr) || IsConnecting(cptr)) {
      if (by && IsUser(by)) {
        sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connection to %s already in "
                      "progress", by, cli_name(cptr));
      }
      return 0;
    }
  }
  /*
   * If we don't know the IP# for this host and it is a hostname and
   * not a ip# string, then try and find the appropriate host record.
   */
  if (!irc_in_addr_valid(&aconf->address.addr)
      && !ircd_aton(&aconf->address.addr, aconf->host)) {
    char buf[HOSTLEN + 1];

    host_from_uh(buf, aconf->host, HOSTLEN);
    gethost_byname(buf, connect_dns_callback, aconf);
    aconf->dns_pending = 1;
    return 0;
  }
  cptr = make_client(NULL, STAT_UNKNOWN_SERVER);

  /*
   * Copy these in so we have something for error detection.
   */
  ircd_strncpy(cli_name(cptr), aconf->name, HOSTLEN);
  ircd_strncpy(cli_sockhost(cptr), aconf->host, HOSTLEN);

  /*
   * Attach config entries to client here rather than in
   * completed_connection. This to avoid null pointer references
   */
  attach_confs_byhost(cptr, aconf->host, CONF_SERVER);

  if (!find_conf_byhost(cli_confs(cptr), aconf->host, CONF_SERVER)) {
    sendto_opmask(0, SNO_OLDSNO, "Host %s is not enabled for "
                  "connecting: no Connect block", aconf->name);
    if (by && IsUser(by) && !MyUser(by)) {
      sendcmdto_one(&me, CMD_NOTICE, by, "%C :Connect to host %s failed: no "
                    "Connect block", by, aconf->name);
    }
    det_confs_butmask(cptr, 0);
    free_client(cptr);
    return 0;
  }
  /*
   * attempt to connect to the server in the conf line
   */
  if (!connect_inet(aconf, cptr)) {
    if (by && IsUser(by) && !MyUser(by)) {
      sendcmdto_one(&me, CMD_NOTICE, by, "%C :Couldn't connect to %s", by,
                    cli_name(cptr));
    }
    det_confs_butmask(cptr, 0);
    free_client(cptr);
    return 0;
  }
  /*
   * NOTE: if we're here we have a valid C:Line and the client should
   * have started the connection and stored the remote address/port and
   * ip address name in itself
   *
   * The socket has been connected or connect is in progress.
   */
  make_server(cptr);
  if (by && IsUser(by)) {
    ircd_snprintf(0, cli_serv(cptr)->by, sizeof(cli_serv(cptr)->by), "%s%s",
		  NumNick(by));
    assert(0 == cli_serv(cptr)->user);
    cli_serv(cptr)->user = cli_user(by);
    cli_user(by)->refcnt++;
  }
  else {
    *(cli_serv(cptr))->by = '\0';
    /* strcpy(cptr->serv->by, "Auto"); */
  }
  cli_serv(cptr)->up = &me;
  SetConnecting(cptr);

  if (cli_fd(cptr) > HighestFd)
    HighestFd = cli_fd(cptr);

  LocalClientArray[cli_fd(cptr)] = cptr;

  Count_newunknown(UserStats);
  /* Actually we lie, the connect hasn't succeeded yet, but we have a valid
   * cptr, so we register it now.
   * Maybe these two calls should be merged.
   */
  add_client_to_list(cptr);
  hAddClient(cptr);
/*    nextping = CurrentTime; */

  return (s_state(&cli_socket(cptr)) == SS_CONNECTED) ?
    completed_connection(cptr) : 1;
}

/** Find the real hostname for the host running the server (or one which
 * matches the server's name) and its primary IP#.  Hostname is stored
 * in the client structure passed as a pointer.
 */
void init_server_identity(void)
{
  const struct LocalConf* conf = conf_get_local();
  assert(0 != conf);

  ircd_strncpy(cli_name(&me), conf->name, HOSTLEN);
  SetYXXServerName(&me, conf->numeric);
}

/** Process events on a client socket.
 * @param ev Socket event structure that has a struct Connection as
 *   its associated data.
 */
static void client_sock_callback(struct Event* ev)
{
  struct Client* cptr;
  struct Connection* con;
  char *fmt = "%s";
  char *fallback = 0;

  assert(0 != ev_socket(ev));
  assert(0 != s_data(ev_socket(ev)));

  con = (struct Connection*) s_data(ev_socket(ev));

  assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);

  cptr = con_client(con);

  assert(0 == cptr || con == cli_connect(cptr));

  switch (ev_type(ev)) {
  case ET_DESTROY:
    con_freeflag(con) &= ~FREEFLAG_SOCKET;

    if (!con_freeflag(con) && !cptr)
      free_connection(con);
#if defined(USE_SSL)
    ssl_free(ev_socket(ev));
#endif
    break;

  case ET_CONNECT: /* socket connection completed */
    if (!completed_connection(cptr) || IsDead(cptr))
      fallback = cli_info(cptr);
    break;

  case ET_ERROR: /* an error occurred */
    fallback = cli_info(cptr);
    cli_error(cptr) = ev_data(ev);
    /* If the OS told us we have a bad file descriptor, we should
     * record that for future reference.
     */
    if (cli_error(cptr) == EBADF)
      cli_fd(cptr) = -1;
    if (s_state(&(con_socket(con))) == SS_CONNECTING) {
      completed_connection(cptr);
      /* for some reason, the os_get_sockerr() in completed_connection()
       * can return 0 even when ev_data(ev) indicates a real error, so
       * re-assign the client error here.
       */
      cli_error(cptr) = ev_data(ev);
      break;
    }
    /*FALLTHROUGH*/
  case ET_EOF: /* end of file on socket */
    Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
	   cli_error(cptr)));
    SetFlag(cptr, FLAG_DEADSOCKET);
    if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
      exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
		      cli_name(cptr), cli_serv(cptr)->last_error_msg);
      return;
    } else {
      fmt = "Read error: %s";
      fallback = "EOF from client";
    }
    break;

  case ET_WRITE: /* socket is writable */
    ClrFlag(cptr, FLAG_BLOCKED);
    if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
      list_next_channels(cptr);
    Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
    send_queued(cptr);
    break;

  case ET_READ: /* socket is readable */
    if (!IsDead(cptr)) {
      Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
      if (read_packet(cptr, 1) == 0) /* error while reading packet */
	fallback = "EOF from client";
    }
    break;

  default:
    assert(0 && "Unrecognized socket event in client_sock_callback()");
    break;
  }

  assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));

  if (fallback) {
    const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
    if (!msg)
      msg = "Unknown error";
    exit_client_msg(cptr, cptr, &me, fmt, msg);
  }
}

/** Process a timer on client socket.
 * @param ev Timer event that has a struct Connection as its
 * associated data.
 */
static void client_timer_callback(struct Event* ev)
{
  struct Client* cptr;
  struct Connection* con;

  assert(0 != ev_timer(ev));
  assert(0 != t_data(ev_timer(ev)));
  assert(ET_DESTROY == ev_type(ev) || ET_EXPIRE == ev_type(ev));

  con = (struct Connection*) t_data(ev_timer(ev));

  assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);

  cptr = con_client(con);

  assert(0 == cptr || con == cli_connect(cptr));

  if (ev_type(ev)== ET_DESTROY) {
    con_freeflag(con) &= ~FREEFLAG_TIMER; /* timer has expired... */

    if (!con_freeflag(con) && !cptr)
      free_connection(con); /* client is being destroyed */
  } else {
    Debug((DEBUG_LIST, "Client process timer for %C expired; processing",
	   cptr));
    read_packet(cptr, 0); /* read_packet will re-add timer if needed */
  }

  assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));
}
Exemple #2
0
/*
 * m_list - generic message handler
 *
 * parv[0] = sender prefix
 * parv[1] = channel list or user/time limit
 * parv[2...] = more user/time limits
 */
int m_list(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
  struct Channel *chptr;
  char *name, *p = 0;
  int show_channels = 0, param;
  struct ListingArgs args;

  if (cli_listing(sptr))            /* Already listing ? */
  {
    if (cli_listing(sptr))
    MyFree(cli_listing(sptr));
    cli_listing(sptr) = 0;
    send_reply(sptr, RPL_LISTEND);
    update_write(sptr);
    if (parc < 2 || 0 == ircd_strcmp("STOP", parv[1]))
      return 0;                 /* Let LIST or LIST STOP abort a listing. */
  }

  if (parc < 2)                 /* No arguments given to /LIST ? */
    args = la_default;
  else {
    args = la_init; /* initialize argument to blank slate */

    for (param = 1; parv[param]; param++) { /* process each parameter */
      switch (param_parse(sptr, parv[param], &args, parc == 2)) {
      case LPARAM_ERROR: /* error encountered, usage already sent, return */
	return 0;
	break;

      case LPARAM_CHANNEL: /* show channel instead */
	show_channels++;
	break;

      case LPARAM_SUCCESS: /* parse succeeded */
	break;
      }
    }
  }

  send_reply(sptr, RPL_LISTSTART);

  if (!show_channels)
  {
    if (args.max_users > args.min_users + 1 && args.max_time > args.min_time &&
        args.max_topic_time > args.min_topic_time)      /* Sanity check */
    {
      cli_listing(sptr) = (struct ListingArgs*) MyMalloc(sizeof(struct ListingArgs));
      assert(0 != cli_listing(sptr));
      memcpy(cli_listing(sptr), &args, sizeof(struct ListingArgs));
      list_next_channels(sptr);
      return 0;
    }
    send_reply(sptr, RPL_LISTEND);
    return 0;
  }

  for (; (name = ircd_strtok(&p, parv[1], ",")); parv[1] = 0)
  {
    chptr = FindChannel(name);
    if (!chptr)
        continue;
    if (ShowChannel(sptr, chptr)
        || (IsAnOper(sptr) && HasPriv(sptr, PRIV_LIST_CHAN)))
      send_reply(sptr, RPL_LIST, chptr->chname,
		 chptr->users - number_of_zombies(chptr), chptr->topic);
  }

  send_reply(sptr, RPL_LISTEND);
  return 0;
}
Exemple #3
0
/** Process events on a client socket.
 * @param ev Socket event structure that has a struct Connection as
 *   its associated data.
 */
static void client_sock_callback(struct Event* ev)
{
  struct Client* cptr;
  struct Connection* con;
  char *fmt = "%s";
  char *fallback = 0;

  assert(0 != ev_socket(ev));
  assert(0 != s_data(ev_socket(ev)));

  con = (struct Connection*) s_data(ev_socket(ev));

  assert(0 != con_client(con) || ev_type(ev) == ET_DESTROY);

  cptr = con_client(con);

  assert(0 == cptr || con == cli_connect(cptr));

  switch (ev_type(ev)) {
  case ET_DESTROY:
    con_freeflag(con) &= ~FREEFLAG_SOCKET;

    if (!con_freeflag(con) && !cptr)
      free_connection(con);
    break;

  case ET_CONNECT: /* socket connection completed */
    if (!completed_connection(cptr) || IsDead(cptr))
      fallback = cli_info(cptr);
    break;

  case ET_ERROR: /* an error occurred */
    fallback = cli_info(cptr);
    cli_error(cptr) = ev_data(ev);
    if (s_state(&(con_socket(con))) == SS_CONNECTING) {
      completed_connection(cptr);
      /* for some reason, the os_get_sockerr() in completed_connect()
       * can return 0 even when ev_data(ev) indicates a real error, so
       * re-assign the client error here.
       */
      cli_error(cptr) = ev_data(ev);
      break;
    }
    /*FALLTHROUGH*/
  case ET_EOF: /* end of file on socket */
    Debug((DEBUG_ERROR, "READ ERROR: fd = %d %d", cli_fd(cptr),
	   cli_error(cptr)));
    SetFlag(cptr, FLAG_DEADSOCKET);
    if ((IsServer(cptr) || IsHandshake(cptr)) && cli_error(cptr) == 0) {
      exit_client_msg(cptr, cptr, &me, "Server %s closed the connection (%s)",
		      cli_name(cptr), cli_serv(cptr)->last_error_msg);
      return;
    } else {
      fmt = "Read error: %s";
      fallback = "EOF from client";
    }
    break;

  case ET_WRITE: /* socket is writable */
    ClrFlag(cptr, FLAG_BLOCKED);
    if (cli_listing(cptr) && MsgQLength(&(cli_sendQ(cptr))) < 2048)
      list_next_channels(cptr);
    Debug((DEBUG_SEND, "Sending queued data to %C", cptr));
    send_queued(cptr);
    break;

  case ET_READ: /* socket is readable */
    if (!IsDead(cptr)) {
      Debug((DEBUG_DEBUG, "Reading data from %C", cptr));
      if (read_packet(cptr, 1) == 0) /* error while reading packet */
	fallback = "EOF from client";
    }
    break;

  default:
    assert(0 && "Unrecognized socket event in client_sock_callback()");
    break;
  }

  assert(0 == cptr || 0 == cli_connect(cptr) || con == cli_connect(cptr));

  if (fallback) {
    const char* msg = (cli_error(cptr)) ? strerror(cli_error(cptr)) : fallback;
    if (!msg)
      msg = "Unknown error";
    exit_client_msg(cptr, cptr, &me, fmt, msg);
  }
}