mirror of
https://github.com/moparisthebest/curl
synced 2024-12-22 16:18:48 -05:00
767 lines
21 KiB
C
767 lines
21 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2006, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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#include "setup.h"
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#ifndef CURL_DISABLE_TFTP
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/* -- WIN32 approved -- */
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <ctype.h>
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#include <errno.h>
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#if defined(WIN32)
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#include <time.h>
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#include <io.h>
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#else
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <netinet/in.h>
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#include <sys/time.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <netdb.h>
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#include <sys/ioctl.h>
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#include <signal.h>
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#endif
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#include "urldata.h"
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#include <curl/curl.h>
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#include "transfer.h"
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#include "sendf.h"
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#include "tftp.h"
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#include "progress.h"
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#include "connect.h"
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#include "strerror.h"
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#include "sockaddr.h" /* required for Curl_sockaddr_storage */
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#include "memory.h"
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#include "select.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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typedef enum {
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TFTP_MODE_NETASCII=0,
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TFTP_MODE_OCTET
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} tftp_mode_t;
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typedef enum {
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TFTP_STATE_START=0,
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TFTP_STATE_RX,
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TFTP_STATE_TX,
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TFTP_STATE_FIN
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} tftp_state_t;
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typedef enum {
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TFTP_EVENT_INIT=0,
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TFTP_EVENT_RRQ = 1,
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TFTP_EVENT_WRQ = 2,
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TFTP_EVENT_DATA = 3,
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TFTP_EVENT_ACK = 4,
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TFTP_EVENT_ERROR = 5,
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TFTP_EVENT_TIMEOUT
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} tftp_event_t;
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typedef enum {
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TFTP_ERR_UNDEF=0,
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TFTP_ERR_NOTFOUND,
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TFTP_ERR_PERM,
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TFTP_ERR_DISKFULL,
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TFTP_ERR_ILLEGAL,
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TFTP_ERR_UNKNOWNID,
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TFTP_ERR_EXISTS,
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TFTP_ERR_NOSUCHUSER,
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TFTP_ERR_TIMEOUT,
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TFTP_ERR_NORESPONSE
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} tftp_error_t;
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typedef struct tftp_packet {
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unsigned short event;
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union {
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struct {
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unsigned char data[512];
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} request;
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struct {
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unsigned short block;
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unsigned char data[512];
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} data;
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struct {
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unsigned short block;
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} ack;
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struct {
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unsigned short code;
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unsigned char data[512];
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} error;
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} u;
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} tftp_packet_t;
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typedef struct tftp_state_data {
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tftp_state_t state;
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tftp_mode_t mode;
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tftp_error_t error;
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struct connectdata *conn;
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curl_socket_t sockfd;
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int retries;
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int retry_time;
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int retry_max;
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time_t start_time;
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time_t max_time;
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unsigned short block;
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struct Curl_sockaddr_storage local_addr;
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socklen_t local_addrlen;
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struct Curl_sockaddr_storage remote_addr;
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socklen_t remote_addrlen;
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int rbytes;
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int sbytes;
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tftp_packet_t rpacket;
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tftp_packet_t spacket;
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} tftp_state_data_t;
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/* Forward declarations */
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static void tftp_rx(tftp_state_data_t *state, tftp_event_t event) ;
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static void tftp_tx(tftp_state_data_t *state, tftp_event_t event) ;
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void tftp_set_timeouts(tftp_state_data_t *state) ;
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/**********************************************************
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*
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* tftp_set_timeouts -
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*
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* Set timeouts based on state machine state.
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* Use user provided connect timeouts until DATA or ACK
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* packet is received, then use user-provided transfer timeouts
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*
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*
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**********************************************************/
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void tftp_set_timeouts(tftp_state_data_t *state)
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{
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struct SessionHandle *data = state->conn->data;
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time_t maxtime, timeout;
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time(&state->start_time);
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if(state->state == TFTP_STATE_START) {
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/* Compute drop-dead time */
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maxtime = (time_t)(data->set.connecttimeout?data->set.connecttimeout:30);
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state->max_time = state->start_time+maxtime;
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/* Set per-block timeout to total */
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timeout = maxtime ;
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/* Average restart after 5 seconds */
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state->retry_max = timeout/5;
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/* Compute the re-start interval to suit the timeout */
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state->retry_time = timeout/state->retry_max;
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if(state->retry_time<1) state->retry_time=1;
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}
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else {
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/* Compute drop-dead time */
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maxtime = (time_t)(data->set.timeout?data->set.timeout:3600);
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state->max_time = state->start_time+maxtime;
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/* Set per-block timeout to 10% of total */
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timeout = maxtime/10 ;
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/* Average reposting an ACK after 15 seconds */
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state->retry_max = timeout/15;
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}
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/* But bound the total number */
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if(state->retry_max<3) state->retry_max=3;
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if(state->retry_max>50) state->retry_max=50;
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/* Compute the re-ACK interval to suit the timeout */
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state->retry_time = timeout/state->retry_max;
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if(state->retry_time<1) state->retry_time=1;
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infof(data, "set timeouts for state %d; Total %d, retry %d maxtry %d\n",
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state->state, (state->max_time-state->start_time),
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state->retry_time, state->retry_max);
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}
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/**********************************************************
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*
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* tftp_set_send_first
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*
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* Event handler for the START state
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*
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**********************************************************/
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static void tftp_send_first(tftp_state_data_t *state, tftp_event_t event)
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{
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int sbytes;
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const char *mode = "octet";
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char *filename = state->conn->path;
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struct SessionHandle *data = state->conn->data;
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/* Set ascii mode if -B flag was used */
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if(data->set.ftp_ascii)
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mode = "netascii";
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switch(event) {
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case TFTP_EVENT_INIT: /* Send the first packet out */
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case TFTP_EVENT_TIMEOUT: /* Resend the first packet out */
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/* Increment the retry counter, quit if over the limit */
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state->retries++;
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if(state->retries>state->retry_max) {
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state->error = TFTP_ERR_NORESPONSE;
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state->state = TFTP_STATE_FIN;
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return;
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}
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if(data->set.upload) {
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/* If we are uploading, send an WRQ */
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state->spacket.event = htons(TFTP_EVENT_WRQ);
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filename = curl_easy_unescape(data, filename, 0, NULL);
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state->conn->upload_fromhere = (char *)state->spacket.u.data.data;
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if(data->set.infilesize != -1)
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Curl_pgrsSetUploadSize(data, data->set.infilesize);
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}
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else {
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/* If we are downloading, send an RRQ */
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state->spacket.event = htons(TFTP_EVENT_RRQ);
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}
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snprintf((char *)state->spacket.u.request.data,
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sizeof(state->spacket.u.request.data),
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"%s%c%s%c", filename, '\0', mode, '\0');
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sbytes = 4 + (int)strlen(filename) + (int)strlen(mode);
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sbytes = sendto(state->sockfd, (void *)&state->spacket,
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sbytes, 0,
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state->conn->ip_addr->ai_addr,
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state->conn->ip_addr->ai_addrlen);
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if(sbytes < 0) {
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failf(data, "%s\n", strerror(errno));
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}
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break;
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case TFTP_EVENT_ACK: /* Connected for transmit */
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infof(data, "%s\n", "Connected for transmit");
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state->state = TFTP_STATE_TX;
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tftp_set_timeouts(state);
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tftp_tx(state, event);
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break;
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case TFTP_EVENT_DATA: /* connected for receive */
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infof(data, "%s\n", "Connected for receive");
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state->state = TFTP_STATE_RX;
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tftp_set_timeouts(state);
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tftp_rx(state, event);
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break;
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case TFTP_EVENT_ERROR:
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state->state = TFTP_STATE_FIN;
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break;
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default:
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failf(state->conn->data, "tftp_send_first: internal error\n");
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break;
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}
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}
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/**********************************************************
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*
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* tftp_rx
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*
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* Event handler for the RX state
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*
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**********************************************************/
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static void tftp_rx(tftp_state_data_t *state, tftp_event_t event)
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{
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int sbytes;
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int rblock;
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struct SessionHandle *data = state->conn->data;
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switch(event) {
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case TFTP_EVENT_DATA:
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/* Is this the block we expect? */
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rblock = ntohs(state->rpacket.u.data.block);
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if ((state->block+1) != rblock) {
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/* No, log it, up the retry count and fail if over the limit */
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infof(data,
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"Received unexpected DATA packet block %d\n", rblock);
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state->retries++;
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if (state->retries>state->retry_max) {
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failf(data, "tftp_rx: giving up waiting for block %d\n",
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state->block+1);
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return;
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}
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}
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/* This is the expected block. Reset counters and ACK it. */
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state->block = rblock;
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state->retries = 0;
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state->spacket.event = htons(TFTP_EVENT_ACK);
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state->spacket.u.ack.block = htons(state->block);
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sbytes = sendto(state->sockfd, (void *)&state->spacket,
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4, SEND_4TH_ARG,
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(struct sockaddr *)&state->remote_addr,
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state->remote_addrlen);
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if(sbytes < 0) {
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failf(data, "%s\n", strerror(errno));
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}
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/* Check if completed (That is, a less than full packet is recieved) */
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if (state->rbytes < (int)sizeof(state->spacket)){
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state->state = TFTP_STATE_FIN;
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}
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else {
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state->state = TFTP_STATE_RX;
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}
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break;
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case TFTP_EVENT_TIMEOUT:
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/* Increment the retry count and fail if over the limit */
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state->retries++;
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infof(data,
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"Timeout waiting for block %d ACK. Retries = %d\n", state->retries);
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if(state->retries > state->retry_max) {
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state->error = TFTP_ERR_TIMEOUT;
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state->state = TFTP_STATE_FIN;
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} else {
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/* Resend the previous ACK */
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sbytes = sendto(state->sockfd, (void *)&state->spacket,
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4, SEND_4TH_ARG,
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(struct sockaddr *)&state->remote_addr,
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state->remote_addrlen);
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/* Check all sbytes were sent */
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if(sbytes<0) {
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failf(data, "%s\n", strerror(errno));
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}
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}
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break;
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case TFTP_EVENT_ERROR:
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state->state = TFTP_STATE_FIN;
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break;
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default:
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failf(data, "%s\n", "tftp_rx: internal error");
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break;
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}
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Curl_pgrsSetDownloadCounter(data,
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(curl_off_t) state->block*512);
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}
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/**********************************************************
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*
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* tftp_tx
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*
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* Event handler for the TX state
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*
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**********************************************************/
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static void tftp_tx(tftp_state_data_t *state, tftp_event_t event)
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{
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struct SessionHandle *data = state->conn->data;
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int sbytes;
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int rblock;
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switch(event) {
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case TFTP_EVENT_ACK:
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/* Ack the packet */
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rblock = ntohs(state->rpacket.u.data.block);
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if(rblock != state->block) {
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/* This isn't the expected block. Log it and up the retry counter */
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infof(data, "Received ACK for block %d, expecting %d\n",
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rblock, state->block);
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state->retries++;
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/* Bail out if over the maximum */
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if(state->retries>state->retry_max) {
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failf(data, "%s\n",
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"tftp_tx: giving up waiting for block %d ack",
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state->block);
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}
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return;
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}
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/* This is the expected packet. Reset the counters and send the next
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block */
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state->block++;
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state->retries = 0;
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state->spacket.event = htons(TFTP_EVENT_DATA);
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state->spacket.u.ack.block = htons(state->block);
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if(state->block > 1 && state->sbytes < 512) {
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state->state = TFTP_STATE_FIN;
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return;
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}
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Curl_fillreadbuffer(state->conn, 512, &state->sbytes);
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sbytes = sendto(state->sockfd, (void *)&state->spacket,
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4+state->sbytes, SEND_4TH_ARG,
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(struct sockaddr *)&state->remote_addr,
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state->remote_addrlen);
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/* Check all sbytes were sent */
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if(sbytes<0) {
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failf(data, "%s\n", strerror(errno));
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}
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break;
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case TFTP_EVENT_TIMEOUT:
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/* Increment the retry counter and log the timeout */
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state->retries++;
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infof(data, "Timeout waiting for block %d ACK. "
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" Retries = %d\n", state->retries);
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/* Decide if we've had enough */
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if(state->retries > state->retry_max) {
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state->error = TFTP_ERR_TIMEOUT;
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state->state = TFTP_STATE_FIN;
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} else {
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/* Re-send the data packet */
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sbytes = sendto(state->sockfd, (void *)&state->spacket,
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4+state->sbytes, SEND_4TH_ARG,
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(struct sockaddr *)&state->remote_addr,
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state->remote_addrlen);
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/* Check all sbytes were sent */
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if(sbytes<0) {
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failf(data, "%s\n", strerror(errno));
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}
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}
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break;
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case TFTP_EVENT_ERROR:
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state->state = TFTP_STATE_FIN;
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break;
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default:
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failf(data, "%s\n", "tftp_tx: internal error");
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break;
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}
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/* Update the progress meter */
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Curl_pgrsSetUploadCounter(data, (curl_off_t) state->block*512);
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}
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/**********************************************************
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*
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* tftp_state_machine
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*
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* The tftp state machine event dispatcher
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*
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**********************************************************/
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static CURLcode tftp_state_machine(tftp_state_data_t *state,
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tftp_event_t event)
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{
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struct SessionHandle *data = state->conn->data;
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switch(state->state) {
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case TFTP_STATE_START:
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DEBUGF(infof(data, "TFTP_STATE_START\n"));
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tftp_send_first(state, event);
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break;
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case TFTP_STATE_RX:
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DEBUGF(infof(data, "TFTP_STATE_RX\n"));
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tftp_rx(state, event);
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break;
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case TFTP_STATE_TX:
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DEBUGF(infof(data, "TFTP_STATE_TX\n"));
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tftp_tx(state, event);
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break;
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case TFTP_STATE_FIN:
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infof(data, "%s\n", "TFTP finished");
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break;
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default:
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DEBUGF(infof(data, "STATE: %d\n", state->state));
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failf(data, "%s\n", "Internal state machine error");
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break;
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}
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return CURLE_OK;
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}
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/**********************************************************
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*
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* Curl_tftp_connect
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*
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* The connect callback
|
|
*
|
|
**********************************************************/
|
|
CURLcode Curl_tftp_connect(struct connectdata *conn, bool *done)
|
|
{
|
|
CURLcode code;
|
|
tftp_state_data_t *state;
|
|
int rc;
|
|
|
|
/*
|
|
* The TFTP code is not portable because it sends C structs directly over
|
|
* the wire. Since C gives compiler writers a wide latitude in padding and
|
|
* aligning structs, this fails on many architectures (e.g. ARM).
|
|
*
|
|
* The only portable way to fix this is to copy each struct item into a
|
|
* flat buffer and send the flat buffer instead of the struct. The
|
|
* alternative, trying to get the compiler to eliminate padding bytes
|
|
* within the struct, is a nightmare to maintain (each compiler does it
|
|
* differently), and is still not guaranteed to work because some
|
|
* architectures can't handle the resulting alignment.
|
|
*
|
|
* This check can be removed once the code has been fixed.
|
|
*/
|
|
if(sizeof(struct tftp_packet) != 516) {
|
|
failf(conn->data, "tftp not supported on this architecture");
|
|
return CURLE_FAILED_INIT;
|
|
}
|
|
|
|
if((state = conn->proto.tftp = calloc(sizeof(tftp_state_data_t), 1))==NULL) {
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
|
|
state->conn = conn;
|
|
state->sockfd = state->conn->sock[FIRSTSOCKET];
|
|
state->state = TFTP_STATE_START;
|
|
|
|
#ifdef WIN32
|
|
/* AF_UNSPEC == 0 (from above calloc) doesn't work on Winsock */
|
|
|
|
/* NOTE: this blatantly assumes IPv4. This should be fixed! */
|
|
((struct sockaddr_in*)&state->local_addr)->sin_family =
|
|
conn->ip_addr->ai_family;
|
|
#endif
|
|
|
|
tftp_set_timeouts(state);
|
|
|
|
/* Bind to any interface, random UDP port.
|
|
*
|
|
* We once used the size of the local_addr struct as the third argument for
|
|
* bind() to better work with IPv6 or whatever size the struct could have,
|
|
* but we learned that at least Tru64, AIX and IRIX *requires* the size of
|
|
* that argument to match the exact size of a 'sockaddr_in' struct when
|
|
* running IPv4-only.
|
|
*
|
|
* Therefore we use the size from the address we connected to, which we
|
|
* assume uses the same IP version and thus hopefully this works for both
|
|
* IPv4 and IPv6...
|
|
*/
|
|
rc = bind(state->sockfd, (struct sockaddr *)&state->local_addr,
|
|
conn->ip_addr->ai_addrlen);
|
|
if(rc) {
|
|
failf(conn->data, "bind() failed; %s\n",
|
|
Curl_strerror(conn,Curl_ourerrno()));
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
|
|
Curl_pgrsStartNow(conn->data);
|
|
|
|
*done = TRUE;
|
|
code = CURLE_OK;
|
|
return(code);
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* Curl_tftp_done
|
|
*
|
|
* The done callback
|
|
*
|
|
**********************************************************/
|
|
CURLcode Curl_tftp_done(struct connectdata *conn, CURLcode status)
|
|
{
|
|
(void)status; /* unused */
|
|
|
|
free(conn->proto.tftp);
|
|
conn->proto.tftp = NULL;
|
|
Curl_pgrsDone(conn);
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
|
|
/**********************************************************
|
|
*
|
|
* Curl_tftp
|
|
*
|
|
* The do callback
|
|
*
|
|
* This callback handles the entire TFTP transfer
|
|
*
|
|
**********************************************************/
|
|
|
|
CURLcode Curl_tftp(struct connectdata *conn, bool *done)
|
|
{
|
|
struct SessionHandle *data = conn->data;
|
|
tftp_state_data_t *state = (tftp_state_data_t *)(conn->proto.tftp);
|
|
tftp_event_t event;
|
|
CURLcode code;
|
|
int rc;
|
|
struct Curl_sockaddr_storage fromaddr;
|
|
socklen_t fromlen;
|
|
int check_time = 0;
|
|
|
|
(void)done; /* prevent compiler warning */
|
|
|
|
/* Run the TFTP State Machine */
|
|
for(tftp_state_machine(state, TFTP_EVENT_INIT);
|
|
state->state != TFTP_STATE_FIN;
|
|
tftp_state_machine(state, event) ) {
|
|
|
|
/* Wait until ready to read or timeout occurs */
|
|
rc=Curl_select(state->sockfd, CURL_SOCKET_BAD, state->retry_time * 1000);
|
|
|
|
if(rc == -1) {
|
|
/* bail out */
|
|
int error = Curl_ourerrno();
|
|
failf(data, "%s\n", Curl_strerror(conn, error));
|
|
event = TFTP_EVENT_ERROR;
|
|
}
|
|
else if (rc==0) {
|
|
/* A timeout occured */
|
|
event = TFTP_EVENT_TIMEOUT;
|
|
|
|
/* Force a look at transfer timeouts */
|
|
check_time = 0;
|
|
|
|
}
|
|
else {
|
|
|
|
/* Receive the packet */
|
|
fromlen=sizeof(fromaddr);
|
|
state->rbytes = recvfrom(state->sockfd,
|
|
(void *)&state->rpacket, sizeof(state->rpacket),
|
|
0, (struct sockaddr *)&fromaddr, &fromlen);
|
|
if(state->remote_addrlen==0) {
|
|
memcpy(&state->remote_addr, &fromaddr, fromlen);
|
|
state->remote_addrlen = fromlen;
|
|
}
|
|
|
|
/* Sanity check packet length */
|
|
if (state->rbytes < 4)
|
|
{
|
|
failf(conn->data, "Received too short packet\n");
|
|
/* Not a timeout, but how best to handle it? */
|
|
event = TFTP_EVENT_TIMEOUT;
|
|
} else {
|
|
|
|
/* The event is given by the TFTP packet time */
|
|
event = (tftp_event_t)ntohs(state->rpacket.event);
|
|
|
|
switch(event) {
|
|
case TFTP_EVENT_DATA:
|
|
if (state->rbytes > 4)
|
|
Curl_client_write(data, CLIENTWRITE_BODY,
|
|
(char *)state->rpacket.u.data.data, state->rbytes-4);
|
|
break;
|
|
case TFTP_EVENT_ERROR:
|
|
state->error = (tftp_error_t)ntohs(state->rpacket.u.error.code);
|
|
infof(conn->data, "%s\n", (char *)state->rpacket.u.error.data);
|
|
break;
|
|
case TFTP_EVENT_ACK:
|
|
break;
|
|
case TFTP_EVENT_RRQ:
|
|
case TFTP_EVENT_WRQ:
|
|
default:
|
|
failf(conn->data, "%s\n", "Internal error: Unexpected packet");
|
|
break;
|
|
}
|
|
|
|
/* Update the progress meter */
|
|
Curl_pgrsUpdate(conn);
|
|
|
|
}
|
|
}
|
|
|
|
/* Check for transfer timeout every 10 blocks, or after timeout */
|
|
if(check_time%10==0) {
|
|
time_t current;
|
|
time(¤t);
|
|
if(current>state->max_time) {
|
|
DEBUGF(infof(data, "timeout: %d > %d\n",
|
|
current, state->max_time));
|
|
state->error = TFTP_ERR_TIMEOUT;
|
|
state->state = TFTP_STATE_FIN;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/* Tell curl we're done */
|
|
Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
|
|
|
|
/* If we have encountered an error */
|
|
if(state->error) {
|
|
|
|
/* Translate internal error codes to curl error codes */
|
|
switch(state->error) {
|
|
case TFTP_ERR_NOTFOUND:
|
|
code = CURLE_TFTP_NOTFOUND;
|
|
break;
|
|
case TFTP_ERR_PERM:
|
|
code = CURLE_TFTP_PERM;
|
|
break;
|
|
case TFTP_ERR_DISKFULL:
|
|
code = CURLE_TFTP_DISKFULL;
|
|
break;
|
|
case TFTP_ERR_ILLEGAL:
|
|
code = CURLE_TFTP_ILLEGAL;
|
|
break;
|
|
case TFTP_ERR_UNKNOWNID:
|
|
code = CURLE_TFTP_UNKNOWNID;
|
|
break;
|
|
case TFTP_ERR_EXISTS:
|
|
code = CURLE_TFTP_EXISTS;
|
|
break;
|
|
case TFTP_ERR_NOSUCHUSER:
|
|
code = CURLE_TFTP_NOSUCHUSER;
|
|
break;
|
|
case TFTP_ERR_TIMEOUT:
|
|
code = CURLE_OPERATION_TIMEOUTED;
|
|
break;
|
|
case TFTP_ERR_NORESPONSE:
|
|
code = CURLE_COULDNT_CONNECT;
|
|
break;
|
|
default:
|
|
code= CURLE_ABORTED_BY_CALLBACK;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
code = CURLE_OK;
|
|
return code;
|
|
}
|
|
#endif
|