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1416 lines
41 KiB
1416 lines
41 KiB
/***************************************************************************
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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) 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 https://curl.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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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifndef CURL_DISABLE_TFTP
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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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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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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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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#include "urldata.h"
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#include <curl/curl.h>
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#include "cf-socket.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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#include "multiif.h"
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#include "url.h"
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#include "strcase.h"
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#include "speedcheck.h"
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#include "select.h"
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#include "escape.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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/* RFC2348 allows the block size to be negotiated */
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#define TFTP_BLKSIZE_DEFAULT 512
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#define TFTP_BLKSIZE_MIN 8
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#define TFTP_BLKSIZE_MAX 65464
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#define TFTP_OPTION_BLKSIZE "blksize"
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/* from RFC2349: */
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#define TFTP_OPTION_TSIZE "tsize"
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#define TFTP_OPTION_INTERVAL "timeout"
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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_NONE = -1,
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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_OACK = 6,
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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, /* This will never be triggered by this code */
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/* The remaining error codes are internal to curl */
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TFTP_ERR_NONE = -100,
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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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struct tftp_packet {
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unsigned char *data;
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};
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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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tftp_event_t event;
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struct Curl_easy *data;
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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 rx_time;
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struct Curl_sockaddr_storage local_addr;
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struct Curl_sockaddr_storage remote_addr;
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curl_socklen_t remote_addrlen;
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int rbytes;
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int sbytes;
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int blksize;
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int requested_blksize;
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unsigned short block;
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struct tftp_packet rpacket;
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struct tftp_packet spacket;
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};
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/* Forward declarations */
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static CURLcode tftp_rx(struct tftp_state_data *state, tftp_event_t event);
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static CURLcode tftp_tx(struct tftp_state_data *state, tftp_event_t event);
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static CURLcode tftp_connect(struct Curl_easy *data, bool *done);
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static CURLcode tftp_disconnect(struct Curl_easy *data,
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struct connectdata *conn,
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bool dead_connection);
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static CURLcode tftp_do(struct Curl_easy *data, bool *done);
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static CURLcode tftp_done(struct Curl_easy *data,
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CURLcode, bool premature);
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static CURLcode tftp_setup_connection(struct Curl_easy *data,
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struct connectdata *conn);
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static CURLcode tftp_multi_statemach(struct Curl_easy *data, bool *done);
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static CURLcode tftp_doing(struct Curl_easy *data, bool *dophase_done);
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static int tftp_getsock(struct Curl_easy *data, struct connectdata *conn,
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curl_socket_t *socks);
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static CURLcode tftp_translate_code(tftp_error_t error);
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/*
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* TFTP protocol handler.
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*/
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const struct Curl_handler Curl_handler_tftp = {
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"TFTP", /* scheme */
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tftp_setup_connection, /* setup_connection */
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tftp_do, /* do_it */
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tftp_done, /* done */
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ZERO_NULL, /* do_more */
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tftp_connect, /* connect_it */
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tftp_multi_statemach, /* connecting */
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tftp_doing, /* doing */
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tftp_getsock, /* proto_getsock */
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tftp_getsock, /* doing_getsock */
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ZERO_NULL, /* domore_getsock */
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ZERO_NULL, /* perform_getsock */
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tftp_disconnect, /* disconnect */
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ZERO_NULL, /* readwrite */
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ZERO_NULL, /* connection_check */
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ZERO_NULL, /* attach connection */
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PORT_TFTP, /* defport */
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CURLPROTO_TFTP, /* protocol */
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CURLPROTO_TFTP, /* family */
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PROTOPT_NOTCPPROXY | PROTOPT_NOURLQUERY /* flags */
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};
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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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static CURLcode tftp_set_timeouts(struct tftp_state_data *state)
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{
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time_t maxtime, timeout;
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timediff_t timeout_ms;
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bool start = (state->state == TFTP_STATE_START) ? TRUE : FALSE;
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/* Compute drop-dead time */
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timeout_ms = Curl_timeleft(state->data, NULL, start);
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if(timeout_ms < 0) {
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/* time-out, bail out, go home */
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failf(state->data, "Connection time-out");
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return CURLE_OPERATION_TIMEDOUT;
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}
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if(timeout_ms > 0)
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maxtime = (time_t)(timeout_ms + 500) / 1000;
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else
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maxtime = 3600; /* use for calculating block timeouts */
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/* Set per-block timeout to total */
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timeout = maxtime;
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/* Average reposting an ACK after 5 seconds */
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state->retry_max = (int)timeout/5;
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/* But bound the total number */
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if(state->retry_max<3)
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state->retry_max = 3;
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if(state->retry_max>50)
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state->retry_max = 50;
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/* Compute the re-ACK interval to suit the timeout */
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state->retry_time = (int)(timeout/state->retry_max);
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if(state->retry_time<1)
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state->retry_time = 1;
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infof(state->data,
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"set timeouts for state %d; Total % " CURL_FORMAT_CURL_OFF_T
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", retry %d maxtry %d",
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(int)state->state, timeout_ms, state->retry_time, state->retry_max);
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/* init RX time */
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time(&state->rx_time);
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return CURLE_OK;
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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 setpacketevent(struct tftp_packet *packet, unsigned short num)
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{
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packet->data[0] = (unsigned char)(num >> 8);
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packet->data[1] = (unsigned char)(num & 0xff);
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}
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static void setpacketblock(struct tftp_packet *packet, unsigned short num)
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{
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packet->data[2] = (unsigned char)(num >> 8);
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packet->data[3] = (unsigned char)(num & 0xff);
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}
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static unsigned short getrpacketevent(const struct tftp_packet *packet)
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{
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return (unsigned short)((packet->data[0] << 8) | packet->data[1]);
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}
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static unsigned short getrpacketblock(const struct tftp_packet *packet)
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{
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return (unsigned short)((packet->data[2] << 8) | packet->data[3]);
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}
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static size_t tftp_strnlen(const char *string, size_t maxlen)
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{
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const char *end = memchr(string, '\0', maxlen);
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return end ? (size_t) (end - string) : maxlen;
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}
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static const char *tftp_option_get(const char *buf, size_t len,
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const char **option, const char **value)
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{
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size_t loc;
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loc = tftp_strnlen(buf, len);
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loc++; /* NULL term */
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if(loc >= len)
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return NULL;
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*option = buf;
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loc += tftp_strnlen(buf + loc, len-loc);
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loc++; /* NULL term */
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if(loc > len)
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return NULL;
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*value = &buf[strlen(*option) + 1];
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return &buf[loc];
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}
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static CURLcode tftp_parse_option_ack(struct tftp_state_data *state,
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const char *ptr, int len)
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{
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const char *tmp = ptr;
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struct Curl_easy *data = state->data;
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/* if OACK doesn't contain blksize option, the default (512) must be used */
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state->blksize = TFTP_BLKSIZE_DEFAULT;
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while(tmp < ptr + len) {
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const char *option, *value;
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tmp = tftp_option_get(tmp, ptr + len - tmp, &option, &value);
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if(!tmp) {
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failf(data, "Malformed ACK packet, rejecting");
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return CURLE_TFTP_ILLEGAL;
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}
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infof(data, "got option=(%s) value=(%s)", option, value);
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if(checkprefix(TFTP_OPTION_BLKSIZE, option)) {
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long blksize;
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blksize = strtol(value, NULL, 10);
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if(!blksize) {
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failf(data, "invalid blocksize value in OACK packet");
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return CURLE_TFTP_ILLEGAL;
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}
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if(blksize > TFTP_BLKSIZE_MAX) {
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failf(data, "%s (%d)", "blksize is larger than max supported",
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TFTP_BLKSIZE_MAX);
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return CURLE_TFTP_ILLEGAL;
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}
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else if(blksize < TFTP_BLKSIZE_MIN) {
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failf(data, "%s (%d)", "blksize is smaller than min supported",
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TFTP_BLKSIZE_MIN);
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return CURLE_TFTP_ILLEGAL;
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}
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else if(blksize > state->requested_blksize) {
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/* could realloc pkt buffers here, but the spec doesn't call out
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* support for the server requesting a bigger blksize than the client
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* requests */
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failf(data, "%s (%ld)",
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"server requested blksize larger than allocated", blksize);
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return CURLE_TFTP_ILLEGAL;
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}
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state->blksize = (int)blksize;
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infof(data, "%s (%d) %s (%d)", "blksize parsed from OACK",
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state->blksize, "requested", state->requested_blksize);
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}
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else if(checkprefix(TFTP_OPTION_TSIZE, option)) {
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long tsize = 0;
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tsize = strtol(value, NULL, 10);
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infof(data, "%s (%ld)", "tsize parsed from OACK", tsize);
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/* tsize should be ignored on upload: Who cares about the size of the
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remote file? */
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if(!data->state.upload) {
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if(!tsize) {
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failf(data, "invalid tsize -:%s:- value in OACK packet", value);
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return CURLE_TFTP_ILLEGAL;
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}
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Curl_pgrsSetDownloadSize(data, tsize);
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}
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}
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}
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return CURLE_OK;
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}
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static CURLcode tftp_option_add(struct tftp_state_data *state, size_t *csize,
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char *buf, const char *option)
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{
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if(( strlen(option) + *csize + 1) > (size_t)state->blksize)
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return CURLE_TFTP_ILLEGAL;
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strcpy(buf, option);
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*csize += strlen(option) + 1;
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return CURLE_OK;
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}
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static CURLcode tftp_connect_for_tx(struct tftp_state_data *state,
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tftp_event_t event)
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{
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CURLcode result;
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#ifndef CURL_DISABLE_VERBOSE_STRINGS
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struct Curl_easy *data = state->data;
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infof(data, "%s", "Connected for transmit");
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#endif
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state->state = TFTP_STATE_TX;
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result = tftp_set_timeouts(state);
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if(result)
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return result;
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return tftp_tx(state, event);
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}
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static CURLcode tftp_connect_for_rx(struct tftp_state_data *state,
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tftp_event_t event)
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{
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CURLcode result;
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#ifndef CURL_DISABLE_VERBOSE_STRINGS
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struct Curl_easy *data = state->data;
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infof(data, "%s", "Connected for receive");
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#endif
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state->state = TFTP_STATE_RX;
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result = tftp_set_timeouts(state);
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if(result)
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return result;
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return tftp_rx(state, event);
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}
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static CURLcode tftp_send_first(struct tftp_state_data *state,
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tftp_event_t event)
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{
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size_t sbytes;
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ssize_t senddata;
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const char *mode = "octet";
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char *filename;
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struct Curl_easy *data = state->data;
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CURLcode result = CURLE_OK;
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/* Set ascii mode if -B flag was used */
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if(data->state.prefer_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 result;
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}
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if(data->state.upload) {
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/* If we are uploading, send an WRQ */
|
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setpacketevent(&state->spacket, TFTP_EVENT_WRQ);
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state->data->req.upload_fromhere =
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(char *)state->spacket.data + 4;
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if(data->state.infilesize != -1)
|
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Curl_pgrsSetUploadSize(data, data->state.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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setpacketevent(&state->spacket, TFTP_EVENT_RRQ);
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}
|
|
/* As RFC3617 describes the separator slash is not actually part of the
|
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file name so we skip the always-present first letter of the path
|
|
string. */
|
|
result = Curl_urldecode(&state->data->state.up.path[1], 0,
|
|
&filename, NULL, REJECT_ZERO);
|
|
if(result)
|
|
return result;
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|
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if(strlen(filename) > (state->blksize - strlen(mode) - 4)) {
|
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failf(data, "TFTP file name too long");
|
|
free(filename);
|
|
return CURLE_TFTP_ILLEGAL; /* too long file name field */
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}
|
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|
|
msnprintf((char *)state->spacket.data + 2,
|
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state->blksize,
|
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"%s%c%s%c", filename, '\0', mode, '\0');
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sbytes = 4 + strlen(filename) + strlen(mode);
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|
|
|
/* optional addition of TFTP options */
|
|
if(!data->set.tftp_no_options) {
|
|
char buf[64];
|
|
/* add tsize option */
|
|
if(data->state.upload && (data->state.infilesize != -1))
|
|
msnprintf(buf, sizeof(buf), "%" CURL_FORMAT_CURL_OFF_T,
|
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data->state.infilesize);
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else
|
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strcpy(buf, "0"); /* the destination is large enough */
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|
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result = tftp_option_add(state, &sbytes,
|
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(char *)state->spacket.data + sbytes,
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TFTP_OPTION_TSIZE);
|
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if(result == CURLE_OK)
|
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result = tftp_option_add(state, &sbytes,
|
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(char *)state->spacket.data + sbytes, buf);
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|
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/* add blksize option */
|
|
msnprintf(buf, sizeof(buf), "%d", state->requested_blksize);
|
|
if(result == CURLE_OK)
|
|
result = tftp_option_add(state, &sbytes,
|
|
(char *)state->spacket.data + sbytes,
|
|
TFTP_OPTION_BLKSIZE);
|
|
if(result == CURLE_OK)
|
|
result = tftp_option_add(state, &sbytes,
|
|
(char *)state->spacket.data + sbytes, buf);
|
|
|
|
/* add timeout option */
|
|
msnprintf(buf, sizeof(buf), "%d", state->retry_time);
|
|
if(result == CURLE_OK)
|
|
result = tftp_option_add(state, &sbytes,
|
|
(char *)state->spacket.data + sbytes,
|
|
TFTP_OPTION_INTERVAL);
|
|
if(result == CURLE_OK)
|
|
result = tftp_option_add(state, &sbytes,
|
|
(char *)state->spacket.data + sbytes, buf);
|
|
|
|
if(result != CURLE_OK) {
|
|
failf(data, "TFTP buffer too small for options");
|
|
free(filename);
|
|
return CURLE_TFTP_ILLEGAL;
|
|
}
|
|
}
|
|
|
|
/* the typecase for the 3rd argument is mostly for systems that do
|
|
not have a size_t argument, like older unixes that want an 'int' */
|
|
senddata = sendto(state->sockfd, (void *)state->spacket.data,
|
|
(SEND_TYPE_ARG3)sbytes, 0,
|
|
&data->conn->remote_addr->sa_addr,
|
|
data->conn->remote_addr->addrlen);
|
|
if(senddata != (ssize_t)sbytes) {
|
|
char buffer[STRERROR_LEN];
|
|
failf(data, "%s", Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
|
|
}
|
|
free(filename);
|
|
break;
|
|
|
|
case TFTP_EVENT_OACK:
|
|
if(data->state.upload) {
|
|
result = tftp_connect_for_tx(state, event);
|
|
}
|
|
else {
|
|
result = tftp_connect_for_rx(state, event);
|
|
}
|
|
break;
|
|
|
|
case TFTP_EVENT_ACK: /* Connected for transmit */
|
|
result = tftp_connect_for_tx(state, event);
|
|
break;
|
|
|
|
case TFTP_EVENT_DATA: /* Connected for receive */
|
|
result = tftp_connect_for_rx(state, event);
|
|
break;
|
|
|
|
case TFTP_EVENT_ERROR:
|
|
state->state = TFTP_STATE_FIN;
|
|
break;
|
|
|
|
default:
|
|
failf(state->data, "tftp_send_first: internal error");
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* the next blocknum is x + 1 but it needs to wrap at an unsigned 16bit
|
|
boundary */
|
|
#define NEXT_BLOCKNUM(x) (((x) + 1)&0xffff)
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_rx
|
|
*
|
|
* Event handler for the RX state
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_rx(struct tftp_state_data *state,
|
|
tftp_event_t event)
|
|
{
|
|
ssize_t sbytes;
|
|
int rblock;
|
|
struct Curl_easy *data = state->data;
|
|
char buffer[STRERROR_LEN];
|
|
|
|
switch(event) {
|
|
|
|
case TFTP_EVENT_DATA:
|
|
/* Is this the block we expect? */
|
|
rblock = getrpacketblock(&state->rpacket);
|
|
if(NEXT_BLOCKNUM(state->block) == rblock) {
|
|
/* This is the expected block. Reset counters and ACK it. */
|
|
state->retries = 0;
|
|
}
|
|
else if(state->block == rblock) {
|
|
/* This is the last recently received block again. Log it and ACK it
|
|
again. */
|
|
infof(data, "Received last DATA packet block %d again.", rblock);
|
|
}
|
|
else {
|
|
/* totally unexpected, just log it */
|
|
infof(data,
|
|
"Received unexpected DATA packet block %d, expecting block %d",
|
|
rblock, NEXT_BLOCKNUM(state->block));
|
|
break;
|
|
}
|
|
|
|
/* ACK this block. */
|
|
state->block = (unsigned short)rblock;
|
|
setpacketevent(&state->spacket, TFTP_EVENT_ACK);
|
|
setpacketblock(&state->spacket, state->block);
|
|
sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
|
4, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
if(sbytes < 0) {
|
|
failf(data, "%s", Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
|
|
return CURLE_SEND_ERROR;
|
|
}
|
|
|
|
/* Check if completed (That is, a less than full packet is received) */
|
|
if(state->rbytes < (ssize_t)state->blksize + 4) {
|
|
state->state = TFTP_STATE_FIN;
|
|
}
|
|
else {
|
|
state->state = TFTP_STATE_RX;
|
|
}
|
|
time(&state->rx_time);
|
|
break;
|
|
|
|
case TFTP_EVENT_OACK:
|
|
/* ACK option acknowledgement so we can move on to data */
|
|
state->block = 0;
|
|
state->retries = 0;
|
|
setpacketevent(&state->spacket, TFTP_EVENT_ACK);
|
|
setpacketblock(&state->spacket, state->block);
|
|
sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
|
4, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
if(sbytes < 0) {
|
|
failf(data, "%s", Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
|
|
return CURLE_SEND_ERROR;
|
|
}
|
|
|
|
/* we're ready to RX data */
|
|
state->state = TFTP_STATE_RX;
|
|
time(&state->rx_time);
|
|
break;
|
|
|
|
case TFTP_EVENT_TIMEOUT:
|
|
/* Increment the retry count and fail if over the limit */
|
|
state->retries++;
|
|
infof(data,
|
|
"Timeout waiting for block %d ACK. Retries = %d",
|
|
NEXT_BLOCKNUM(state->block), state->retries);
|
|
if(state->retries > state->retry_max) {
|
|
state->error = TFTP_ERR_TIMEOUT;
|
|
state->state = TFTP_STATE_FIN;
|
|
}
|
|
else {
|
|
/* Resend the previous ACK */
|
|
sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
|
4, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
if(sbytes<0) {
|
|
failf(data, "%s", Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
|
|
return CURLE_SEND_ERROR;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case TFTP_EVENT_ERROR:
|
|
setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
|
|
setpacketblock(&state->spacket, state->block);
|
|
(void)sendto(state->sockfd, (void *)state->spacket.data,
|
|
4, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
/* don't bother with the return code, but if the socket is still up we
|
|
* should be a good TFTP client and let the server know we're done */
|
|
state->state = TFTP_STATE_FIN;
|
|
break;
|
|
|
|
default:
|
|
failf(data, "%s", "tftp_rx: internal error");
|
|
return CURLE_TFTP_ILLEGAL; /* not really the perfect return code for
|
|
this */
|
|
}
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_tx
|
|
*
|
|
* Event handler for the TX state
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_tx(struct tftp_state_data *state, tftp_event_t event)
|
|
{
|
|
struct Curl_easy *data = state->data;
|
|
ssize_t sbytes;
|
|
CURLcode result = CURLE_OK;
|
|
struct SingleRequest *k = &data->req;
|
|
size_t cb; /* Bytes currently read */
|
|
char buffer[STRERROR_LEN];
|
|
|
|
switch(event) {
|
|
|
|
case TFTP_EVENT_ACK:
|
|
case TFTP_EVENT_OACK:
|
|
if(event == TFTP_EVENT_ACK) {
|
|
/* Ack the packet */
|
|
int rblock = getrpacketblock(&state->rpacket);
|
|
|
|
if(rblock != state->block &&
|
|
/* There's a bug in tftpd-hpa that causes it to send us an ack for
|
|
* 65535 when the block number wraps to 0. So when we're expecting
|
|
* 0, also accept 65535. See
|
|
* https://www.syslinux.org/archives/2010-September/015612.html
|
|
* */
|
|
!(state->block == 0 && rblock == 65535)) {
|
|
/* This isn't the expected block. Log it and up the retry counter */
|
|
infof(data, "Received ACK for block %d, expecting %d",
|
|
rblock, state->block);
|
|
state->retries++;
|
|
/* Bail out if over the maximum */
|
|
if(state->retries>state->retry_max) {
|
|
failf(data, "tftp_tx: giving up waiting for block %d ack",
|
|
state->block);
|
|
result = CURLE_SEND_ERROR;
|
|
}
|
|
else {
|
|
/* Re-send the data packet */
|
|
sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
|
4 + state->sbytes, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
/* Check all sbytes were sent */
|
|
if(sbytes<0) {
|
|
failf(data, "%s", Curl_strerror(SOCKERRNO,
|
|
buffer, sizeof(buffer)));
|
|
result = CURLE_SEND_ERROR;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
/* This is the expected packet. Reset the counters and send the next
|
|
block */
|
|
time(&state->rx_time);
|
|
state->block++;
|
|
}
|
|
else
|
|
state->block = 1; /* first data block is 1 when using OACK */
|
|
|
|
state->retries = 0;
|
|
setpacketevent(&state->spacket, TFTP_EVENT_DATA);
|
|
setpacketblock(&state->spacket, state->block);
|
|
if(state->block > 1 && state->sbytes < state->blksize) {
|
|
state->state = TFTP_STATE_FIN;
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* TFTP considers data block size < 512 bytes as an end of session. So
|
|
* in some cases we must wait for additional data to build full (512 bytes)
|
|
* data block.
|
|
* */
|
|
state->sbytes = 0;
|
|
state->data->req.upload_fromhere = (char *)state->spacket.data + 4;
|
|
do {
|
|
result = Curl_fillreadbuffer(data, state->blksize - state->sbytes, &cb);
|
|
if(result)
|
|
return result;
|
|
state->sbytes += (int)cb;
|
|
state->data->req.upload_fromhere += cb;
|
|
} while(state->sbytes < state->blksize && cb);
|
|
|
|
sbytes = sendto(state->sockfd, (void *) state->spacket.data,
|
|
4 + state->sbytes, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
/* Check all sbytes were sent */
|
|
if(sbytes<0) {
|
|
failf(data, "%s", Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
|
|
return CURLE_SEND_ERROR;
|
|
}
|
|
/* Update the progress meter */
|
|
k->writebytecount += state->sbytes;
|
|
Curl_pgrsSetUploadCounter(data, k->writebytecount);
|
|
break;
|
|
|
|
case TFTP_EVENT_TIMEOUT:
|
|
/* Increment the retry counter and log the timeout */
|
|
state->retries++;
|
|
infof(data, "Timeout waiting for block %d ACK. "
|
|
" Retries = %d", NEXT_BLOCKNUM(state->block), state->retries);
|
|
/* Decide if we've had enough */
|
|
if(state->retries > state->retry_max) {
|
|
state->error = TFTP_ERR_TIMEOUT;
|
|
state->state = TFTP_STATE_FIN;
|
|
}
|
|
else {
|
|
/* Re-send the data packet */
|
|
sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
|
4 + state->sbytes, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
/* Check all sbytes were sent */
|
|
if(sbytes<0) {
|
|
failf(data, "%s", Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
|
|
return CURLE_SEND_ERROR;
|
|
}
|
|
/* since this was a re-send, we remain at the still byte position */
|
|
Curl_pgrsSetUploadCounter(data, k->writebytecount);
|
|
}
|
|
break;
|
|
|
|
case TFTP_EVENT_ERROR:
|
|
state->state = TFTP_STATE_FIN;
|
|
setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
|
|
setpacketblock(&state->spacket, state->block);
|
|
(void)sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG,
|
|
(struct sockaddr *)&state->remote_addr,
|
|
state->remote_addrlen);
|
|
/* don't bother with the return code, but if the socket is still up we
|
|
* should be a good TFTP client and let the server know we're done */
|
|
state->state = TFTP_STATE_FIN;
|
|
break;
|
|
|
|
default:
|
|
failf(data, "tftp_tx: internal error, event: %i", (int)(event));
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_translate_code
|
|
*
|
|
* Translate internal error codes to CURL error codes
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_translate_code(tftp_error_t error)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
|
|
if(error != TFTP_ERR_NONE) {
|
|
switch(error) {
|
|
case TFTP_ERR_NOTFOUND:
|
|
result = CURLE_TFTP_NOTFOUND;
|
|
break;
|
|
case TFTP_ERR_PERM:
|
|
result = CURLE_TFTP_PERM;
|
|
break;
|
|
case TFTP_ERR_DISKFULL:
|
|
result = CURLE_REMOTE_DISK_FULL;
|
|
break;
|
|
case TFTP_ERR_UNDEF:
|
|
case TFTP_ERR_ILLEGAL:
|
|
result = CURLE_TFTP_ILLEGAL;
|
|
break;
|
|
case TFTP_ERR_UNKNOWNID:
|
|
result = CURLE_TFTP_UNKNOWNID;
|
|
break;
|
|
case TFTP_ERR_EXISTS:
|
|
result = CURLE_REMOTE_FILE_EXISTS;
|
|
break;
|
|
case TFTP_ERR_NOSUCHUSER:
|
|
result = CURLE_TFTP_NOSUCHUSER;
|
|
break;
|
|
case TFTP_ERR_TIMEOUT:
|
|
result = CURLE_OPERATION_TIMEDOUT;
|
|
break;
|
|
case TFTP_ERR_NORESPONSE:
|
|
result = CURLE_COULDNT_CONNECT;
|
|
break;
|
|
default:
|
|
result = CURLE_ABORTED_BY_CALLBACK;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
result = CURLE_OK;
|
|
|
|
return result;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_state_machine
|
|
*
|
|
* The tftp state machine event dispatcher
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_state_machine(struct tftp_state_data *state,
|
|
tftp_event_t event)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct Curl_easy *data = state->data;
|
|
|
|
switch(state->state) {
|
|
case TFTP_STATE_START:
|
|
DEBUGF(infof(data, "TFTP_STATE_START"));
|
|
result = tftp_send_first(state, event);
|
|
break;
|
|
case TFTP_STATE_RX:
|
|
DEBUGF(infof(data, "TFTP_STATE_RX"));
|
|
result = tftp_rx(state, event);
|
|
break;
|
|
case TFTP_STATE_TX:
|
|
DEBUGF(infof(data, "TFTP_STATE_TX"));
|
|
result = tftp_tx(state, event);
|
|
break;
|
|
case TFTP_STATE_FIN:
|
|
infof(data, "%s", "TFTP finished");
|
|
break;
|
|
default:
|
|
DEBUGF(infof(data, "STATE: %d", state->state));
|
|
failf(data, "%s", "Internal state machine error");
|
|
result = CURLE_TFTP_ILLEGAL;
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_disconnect
|
|
*
|
|
* The disconnect callback
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_disconnect(struct Curl_easy *data,
|
|
struct connectdata *conn, bool dead_connection)
|
|
{
|
|
struct tftp_state_data *state = conn->proto.tftpc;
|
|
(void) data;
|
|
(void) dead_connection;
|
|
|
|
/* done, free dynamically allocated pkt buffers */
|
|
if(state) {
|
|
Curl_safefree(state->rpacket.data);
|
|
Curl_safefree(state->spacket.data);
|
|
free(state);
|
|
}
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_connect
|
|
*
|
|
* The connect callback
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_connect(struct Curl_easy *data, bool *done)
|
|
{
|
|
struct tftp_state_data *state;
|
|
int blksize;
|
|
int need_blksize;
|
|
struct connectdata *conn = data->conn;
|
|
|
|
blksize = TFTP_BLKSIZE_DEFAULT;
|
|
|
|
state = conn->proto.tftpc = calloc(1, sizeof(struct tftp_state_data));
|
|
if(!state)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
/* alloc pkt buffers based on specified blksize */
|
|
if(data->set.tftp_blksize) {
|
|
blksize = (int)data->set.tftp_blksize;
|
|
if(blksize > TFTP_BLKSIZE_MAX || blksize < TFTP_BLKSIZE_MIN)
|
|
return CURLE_TFTP_ILLEGAL;
|
|
}
|
|
|
|
need_blksize = blksize;
|
|
/* default size is the fallback when no OACK is received */
|
|
if(need_blksize < TFTP_BLKSIZE_DEFAULT)
|
|
need_blksize = TFTP_BLKSIZE_DEFAULT;
|
|
|
|
if(!state->rpacket.data) {
|
|
state->rpacket.data = calloc(1, need_blksize + 2 + 2);
|
|
|
|
if(!state->rpacket.data)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
|
|
if(!state->spacket.data) {
|
|
state->spacket.data = calloc(1, need_blksize + 2 + 2);
|
|
|
|
if(!state->spacket.data)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
|
|
/* we don't keep TFTP connections up basically because there's none or very
|
|
* little gain for UDP */
|
|
connclose(conn, "TFTP");
|
|
|
|
state->data = data;
|
|
state->sockfd = conn->sock[FIRSTSOCKET];
|
|
state->state = TFTP_STATE_START;
|
|
state->error = TFTP_ERR_NONE;
|
|
state->blksize = TFTP_BLKSIZE_DEFAULT; /* Unless updated by OACK response */
|
|
state->requested_blksize = blksize;
|
|
|
|
((struct sockaddr *)&state->local_addr)->sa_family =
|
|
(CURL_SA_FAMILY_T)(conn->remote_addr->family);
|
|
|
|
tftp_set_timeouts(state);
|
|
|
|
if(!conn->bits.bound) {
|
|
/* If not already bound, bind to any interface, random UDP port. If it is
|
|
* reused or a custom local port was desired, this has already been done!
|
|
*
|
|
* 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...
|
|
*/
|
|
int rc = bind(state->sockfd, (struct sockaddr *)&state->local_addr,
|
|
conn->remote_addr->addrlen);
|
|
if(rc) {
|
|
char buffer[STRERROR_LEN];
|
|
failf(data, "bind() failed; %s",
|
|
Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
conn->bits.bound = TRUE;
|
|
}
|
|
|
|
Curl_pgrsStartNow(data);
|
|
|
|
*done = TRUE;
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_done
|
|
*
|
|
* The done callback
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_done(struct Curl_easy *data, CURLcode status,
|
|
bool premature)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct connectdata *conn = data->conn;
|
|
struct tftp_state_data *state = conn->proto.tftpc;
|
|
|
|
(void)status; /* unused */
|
|
(void)premature; /* not used */
|
|
|
|
if(Curl_pgrsDone(data))
|
|
return CURLE_ABORTED_BY_CALLBACK;
|
|
|
|
/* If we have encountered an error */
|
|
if(state)
|
|
result = tftp_translate_code(state->error);
|
|
|
|
return result;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_getsock
|
|
*
|
|
* The getsock callback
|
|
*
|
|
**********************************************************/
|
|
static int tftp_getsock(struct Curl_easy *data,
|
|
struct connectdata *conn, curl_socket_t *socks)
|
|
{
|
|
(void)data;
|
|
socks[0] = conn->sock[FIRSTSOCKET];
|
|
return GETSOCK_READSOCK(0);
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_receive_packet
|
|
*
|
|
* Called once select fires and data is ready on the socket
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_receive_packet(struct Curl_easy *data)
|
|
{
|
|
struct Curl_sockaddr_storage fromaddr;
|
|
curl_socklen_t fromlen;
|
|
CURLcode result = CURLE_OK;
|
|
struct connectdata *conn = data->conn;
|
|
struct tftp_state_data *state = conn->proto.tftpc;
|
|
struct SingleRequest *k = &data->req;
|
|
|
|
/* Receive the packet */
|
|
fromlen = sizeof(fromaddr);
|
|
state->rbytes = (int)recvfrom(state->sockfd,
|
|
(void *)state->rpacket.data,
|
|
state->blksize + 4,
|
|
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(data, "Received too short packet");
|
|
/* Not a timeout, but how best to handle it? */
|
|
state->event = TFTP_EVENT_TIMEOUT;
|
|
}
|
|
else {
|
|
/* The event is given by the TFTP packet time */
|
|
unsigned short event = getrpacketevent(&state->rpacket);
|
|
state->event = (tftp_event_t)event;
|
|
|
|
switch(state->event) {
|
|
case TFTP_EVENT_DATA:
|
|
/* Don't pass to the client empty or retransmitted packets */
|
|
if(state->rbytes > 4 &&
|
|
(NEXT_BLOCKNUM(state->block) == getrpacketblock(&state->rpacket))) {
|
|
result = Curl_client_write(data, CLIENTWRITE_BODY,
|
|
(char *)state->rpacket.data + 4,
|
|
state->rbytes-4);
|
|
if(!result) {
|
|
k->bytecount += state->rbytes-4;
|
|
result = Curl_pgrsSetDownloadCounter(data,
|
|
(curl_off_t) k->bytecount);
|
|
}
|
|
if(result) {
|
|
tftp_state_machine(state, TFTP_EVENT_ERROR);
|
|
return result;
|
|
}
|
|
}
|
|
break;
|
|
case TFTP_EVENT_ERROR:
|
|
{
|
|
unsigned short error = getrpacketblock(&state->rpacket);
|
|
char *str = (char *)state->rpacket.data + 4;
|
|
size_t strn = state->rbytes - 4;
|
|
state->error = (tftp_error_t)error;
|
|
if(tftp_strnlen(str, strn) < strn)
|
|
infof(data, "TFTP error: %s", str);
|
|
break;
|
|
}
|
|
case TFTP_EVENT_ACK:
|
|
break;
|
|
case TFTP_EVENT_OACK:
|
|
result = tftp_parse_option_ack(state,
|
|
(const char *)state->rpacket.data + 2,
|
|
state->rbytes-2);
|
|
if(result)
|
|
return result;
|
|
break;
|
|
case TFTP_EVENT_RRQ:
|
|
case TFTP_EVENT_WRQ:
|
|
default:
|
|
failf(data, "%s", "Internal error: Unexpected packet");
|
|
break;
|
|
}
|
|
|
|
/* Update the progress meter */
|
|
if(Curl_pgrsUpdate(data)) {
|
|
tftp_state_machine(state, TFTP_EVENT_ERROR);
|
|
return CURLE_ABORTED_BY_CALLBACK;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_state_timeout
|
|
*
|
|
* Check if timeouts have been reached
|
|
*
|
|
**********************************************************/
|
|
static timediff_t tftp_state_timeout(struct Curl_easy *data,
|
|
tftp_event_t *event)
|
|
{
|
|
time_t current;
|
|
struct connectdata *conn = data->conn;
|
|
struct tftp_state_data *state = conn->proto.tftpc;
|
|
timediff_t timeout_ms;
|
|
|
|
if(event)
|
|
*event = TFTP_EVENT_NONE;
|
|
|
|
timeout_ms = Curl_timeleft(state->data, NULL,
|
|
(state->state == TFTP_STATE_START));
|
|
if(timeout_ms < 0) {
|
|
state->error = TFTP_ERR_TIMEOUT;
|
|
state->state = TFTP_STATE_FIN;
|
|
return 0;
|
|
}
|
|
time(¤t);
|
|
if(current > state->rx_time + state->retry_time) {
|
|
if(event)
|
|
*event = TFTP_EVENT_TIMEOUT;
|
|
time(&state->rx_time); /* update even though we received nothing */
|
|
}
|
|
|
|
return timeout_ms;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_multi_statemach
|
|
*
|
|
* Handle single RX socket event and return
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_multi_statemach(struct Curl_easy *data, bool *done)
|
|
{
|
|
tftp_event_t event;
|
|
CURLcode result = CURLE_OK;
|
|
struct connectdata *conn = data->conn;
|
|
struct tftp_state_data *state = conn->proto.tftpc;
|
|
timediff_t timeout_ms = tftp_state_timeout(data, &event);
|
|
|
|
*done = FALSE;
|
|
|
|
if(timeout_ms < 0) {
|
|
failf(data, "TFTP response timeout");
|
|
return CURLE_OPERATION_TIMEDOUT;
|
|
}
|
|
if(event != TFTP_EVENT_NONE) {
|
|
result = tftp_state_machine(state, event);
|
|
if(result)
|
|
return result;
|
|
*done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
|
|
if(*done)
|
|
/* Tell curl we're done */
|
|
Curl_setup_transfer(data, -1, -1, FALSE, -1);
|
|
}
|
|
else {
|
|
/* no timeouts to handle, check our socket */
|
|
int rc = SOCKET_READABLE(state->sockfd, 0);
|
|
|
|
if(rc == -1) {
|
|
/* bail out */
|
|
int error = SOCKERRNO;
|
|
char buffer[STRERROR_LEN];
|
|
failf(data, "%s", Curl_strerror(error, buffer, sizeof(buffer)));
|
|
state->event = TFTP_EVENT_ERROR;
|
|
}
|
|
else if(rc) {
|
|
result = tftp_receive_packet(data);
|
|
if(result)
|
|
return result;
|
|
result = tftp_state_machine(state, state->event);
|
|
if(result)
|
|
return result;
|
|
*done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
|
|
if(*done)
|
|
/* Tell curl we're done */
|
|
Curl_setup_transfer(data, -1, -1, FALSE, -1);
|
|
}
|
|
/* if rc == 0, then select() timed out */
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_doing
|
|
*
|
|
* Called from multi.c while DOing
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_doing(struct Curl_easy *data, bool *dophase_done)
|
|
{
|
|
CURLcode result;
|
|
result = tftp_multi_statemach(data, dophase_done);
|
|
|
|
if(*dophase_done) {
|
|
DEBUGF(infof(data, "DO phase is complete"));
|
|
}
|
|
else if(!result) {
|
|
/* The multi code doesn't have this logic for the DOING state so we
|
|
provide it for TFTP since it may do the entire transfer in this
|
|
state. */
|
|
if(Curl_pgrsUpdate(data))
|
|
result = CURLE_ABORTED_BY_CALLBACK;
|
|
else
|
|
result = Curl_speedcheck(data, Curl_now());
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_perform
|
|
*
|
|
* Entry point for transfer from tftp_do, starts state mach
|
|
*
|
|
**********************************************************/
|
|
static CURLcode tftp_perform(struct Curl_easy *data, bool *dophase_done)
|
|
{
|
|
CURLcode result = CURLE_OK;
|
|
struct connectdata *conn = data->conn;
|
|
struct tftp_state_data *state = conn->proto.tftpc;
|
|
|
|
*dophase_done = FALSE;
|
|
|
|
result = tftp_state_machine(state, TFTP_EVENT_INIT);
|
|
|
|
if((state->state == TFTP_STATE_FIN) || result)
|
|
return result;
|
|
|
|
tftp_multi_statemach(data, dophase_done);
|
|
|
|
if(*dophase_done)
|
|
DEBUGF(infof(data, "DO phase is complete"));
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
/**********************************************************
|
|
*
|
|
* tftp_do
|
|
*
|
|
* The do callback
|
|
*
|
|
* This callback initiates the TFTP transfer
|
|
*
|
|
**********************************************************/
|
|
|
|
static CURLcode tftp_do(struct Curl_easy *data, bool *done)
|
|
{
|
|
struct tftp_state_data *state;
|
|
CURLcode result;
|
|
struct connectdata *conn = data->conn;
|
|
|
|
*done = FALSE;
|
|
|
|
if(!conn->proto.tftpc) {
|
|
result = tftp_connect(data, done);
|
|
if(result)
|
|
return result;
|
|
}
|
|
|
|
state = conn->proto.tftpc;
|
|
if(!state)
|
|
return CURLE_TFTP_ILLEGAL;
|
|
|
|
result = tftp_perform(data, done);
|
|
|
|
/* If tftp_perform() returned an error, use that for return code. If it
|
|
was OK, see if tftp_translate_code() has an error. */
|
|
if(!result)
|
|
/* If we have encountered an internal tftp error, translate it. */
|
|
result = tftp_translate_code(state->error);
|
|
|
|
return result;
|
|
}
|
|
|
|
static CURLcode tftp_setup_connection(struct Curl_easy *data,
|
|
struct connectdata *conn)
|
|
{
|
|
char *type;
|
|
|
|
conn->transport = TRNSPRT_UDP;
|
|
|
|
/* TFTP URLs support an extension like ";mode=<typecode>" that
|
|
* we'll try to get now! */
|
|
type = strstr(data->state.up.path, ";mode=");
|
|
|
|
if(!type)
|
|
type = strstr(conn->host.rawalloc, ";mode=");
|
|
|
|
if(type) {
|
|
char command;
|
|
*type = 0; /* it was in the middle of the hostname */
|
|
command = Curl_raw_toupper(type[6]);
|
|
|
|
switch(command) {
|
|
case 'A': /* ASCII mode */
|
|
case 'N': /* NETASCII mode */
|
|
data->state.prefer_ascii = TRUE;
|
|
break;
|
|
|
|
case 'O': /* octet mode */
|
|
case 'I': /* binary mode */
|
|
default:
|
|
/* switch off ASCII */
|
|
data->state.prefer_ascii = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return CURLE_OK;
|
|
}
|
|
#endif
|