[164] | 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | #ifndef CURL_DISABLE_TFTP
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| 26 |
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| 27 | #ifdef HAVE_NETINET_IN_H
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| 28 | #include <netinet/in.h>
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| 29 | #endif
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| 30 | #ifdef HAVE_NETDB_H
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| 31 | #include <netdb.h>
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| 32 | #endif
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| 33 | #ifdef HAVE_ARPA_INET_H
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| 34 | #include <arpa/inet.h>
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| 35 | #endif
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| 36 | #ifdef HAVE_NET_IF_H
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| 37 | #include <net/if.h>
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| 38 | #endif
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| 39 | #ifdef HAVE_SYS_IOCTL_H
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| 40 | #include <sys/ioctl.h>
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| 41 | #endif
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| 42 |
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| 43 | #ifdef HAVE_SYS_PARAM_H
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| 44 | #include <sys/param.h>
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| 45 | #endif
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| 46 |
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| 47 | #include "urldata.h"
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| 48 | #include <curl/curl.h>
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| 49 | #include "transfer.h"
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| 50 | #include "sendf.h"
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| 51 | #include "tftp.h"
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| 52 | #include "progress.h"
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| 53 | #include "connect.h"
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| 54 | #include "strerror.h"
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| 55 | #include "sockaddr.h" /* required for Curl_sockaddr_storage */
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| 56 | #include "multiif.h"
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| 57 | #include "url.h"
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| 58 | #include "rawstr.h"
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| 59 | #include "speedcheck.h"
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| 60 | #include "curl_printf.h"
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| 61 | #include "select.h"
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| 62 |
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| 63 | /* The last #include files should be: */
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| 64 | #include "curl_memory.h"
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| 65 | #include "memdebug.h"
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| 66 |
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| 67 | /* RFC2348 allows the block size to be negotiated */
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| 68 | #define TFTP_BLKSIZE_DEFAULT 512
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| 69 | #define TFTP_BLKSIZE_MIN 8
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| 70 | #define TFTP_BLKSIZE_MAX 65464
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| 71 | #define TFTP_OPTION_BLKSIZE "blksize"
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| 72 |
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| 73 | /* from RFC2349: */
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| 74 | #define TFTP_OPTION_TSIZE "tsize"
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| 75 | #define TFTP_OPTION_INTERVAL "timeout"
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| 76 |
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| 77 | typedef enum {
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| 78 | TFTP_MODE_NETASCII=0,
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| 79 | TFTP_MODE_OCTET
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| 80 | } tftp_mode_t;
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| 81 |
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| 82 | typedef enum {
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| 83 | TFTP_STATE_START=0,
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| 84 | TFTP_STATE_RX,
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| 85 | TFTP_STATE_TX,
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| 86 | TFTP_STATE_FIN
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| 87 | } tftp_state_t;
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| 88 |
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| 89 | typedef enum {
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| 90 | TFTP_EVENT_NONE = -1,
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| 91 | TFTP_EVENT_INIT = 0,
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| 92 | TFTP_EVENT_RRQ = 1,
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| 93 | TFTP_EVENT_WRQ = 2,
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| 94 | TFTP_EVENT_DATA = 3,
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| 95 | TFTP_EVENT_ACK = 4,
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| 96 | TFTP_EVENT_ERROR = 5,
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| 97 | TFTP_EVENT_OACK = 6,
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| 98 | TFTP_EVENT_TIMEOUT
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| 99 | } tftp_event_t;
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| 100 |
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| 101 | typedef enum {
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| 102 | TFTP_ERR_UNDEF=0,
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| 103 | TFTP_ERR_NOTFOUND,
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| 104 | TFTP_ERR_PERM,
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| 105 | TFTP_ERR_DISKFULL,
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| 106 | TFTP_ERR_ILLEGAL,
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| 107 | TFTP_ERR_UNKNOWNID,
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| 108 | TFTP_ERR_EXISTS,
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| 109 | TFTP_ERR_NOSUCHUSER, /* This will never be triggered by this code */
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| 110 |
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| 111 | /* The remaining error codes are internal to curl */
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| 112 | TFTP_ERR_NONE = -100,
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| 113 | TFTP_ERR_TIMEOUT,
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| 114 | TFTP_ERR_NORESPONSE
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| 115 | } tftp_error_t;
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| 116 |
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| 117 | typedef struct tftp_packet {
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| 118 | unsigned char *data;
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| 119 | } tftp_packet_t;
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| 120 |
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| 121 | typedef struct tftp_state_data {
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| 122 | tftp_state_t state;
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| 123 | tftp_mode_t mode;
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| 124 | tftp_error_t error;
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| 125 | tftp_event_t event;
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| 126 | struct connectdata *conn;
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| 127 | curl_socket_t sockfd;
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| 128 | int retries;
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| 129 | int retry_time;
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| 130 | int retry_max;
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| 131 | time_t start_time;
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| 132 | time_t max_time;
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| 133 | time_t rx_time;
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| 134 | unsigned short block;
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| 135 | struct Curl_sockaddr_storage local_addr;
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| 136 | struct Curl_sockaddr_storage remote_addr;
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| 137 | curl_socklen_t remote_addrlen;
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| 138 | int rbytes;
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| 139 | int sbytes;
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| 140 | int blksize;
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| 141 | int requested_blksize;
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| 142 | tftp_packet_t rpacket;
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| 143 | tftp_packet_t spacket;
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| 144 | } tftp_state_data_t;
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| 145 |
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| 146 |
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| 147 | /* Forward declarations */
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| 148 | static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event);
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| 149 | static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event);
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| 150 | static CURLcode tftp_connect(struct connectdata *conn, bool *done);
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| 151 | static CURLcode tftp_disconnect(struct connectdata *conn,
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| 152 | bool dead_connection);
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| 153 | static CURLcode tftp_do(struct connectdata *conn, bool *done);
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| 154 | static CURLcode tftp_done(struct connectdata *conn,
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| 155 | CURLcode, bool premature);
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| 156 | static CURLcode tftp_setup_connection(struct connectdata * conn);
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| 157 | static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done);
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| 158 | static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done);
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| 159 | static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks,
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| 160 | int numsocks);
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| 161 | static CURLcode tftp_translate_code(tftp_error_t error);
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| 162 |
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| 163 |
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| 164 | /*
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| 165 | * TFTP protocol handler.
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| 166 | */
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| 167 |
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| 168 | const struct Curl_handler Curl_handler_tftp = {
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| 169 | "TFTP", /* scheme */
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| 170 | tftp_setup_connection, /* setup_connection */
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| 171 | tftp_do, /* do_it */
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| 172 | tftp_done, /* done */
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| 173 | ZERO_NULL, /* do_more */
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| 174 | tftp_connect, /* connect_it */
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| 175 | tftp_multi_statemach, /* connecting */
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| 176 | tftp_doing, /* doing */
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| 177 | tftp_getsock, /* proto_getsock */
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| 178 | tftp_getsock, /* doing_getsock */
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| 179 | ZERO_NULL, /* domore_getsock */
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| 180 | ZERO_NULL, /* perform_getsock */
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| 181 | tftp_disconnect, /* disconnect */
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| 182 | ZERO_NULL, /* readwrite */
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| 183 | PORT_TFTP, /* defport */
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| 184 | CURLPROTO_TFTP, /* protocol */
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| 185 | PROTOPT_NONE | PROTOPT_NOURLQUERY /* flags */
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| 186 | };
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| 187 |
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| 188 | /**********************************************************
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| 189 | *
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| 190 | * tftp_set_timeouts -
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| 191 | *
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| 192 | * Set timeouts based on state machine state.
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| 193 | * Use user provided connect timeouts until DATA or ACK
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| 194 | * packet is received, then use user-provided transfer timeouts
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| 195 | *
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| 196 | *
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| 197 | **********************************************************/
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| 198 | static CURLcode tftp_set_timeouts(tftp_state_data_t *state)
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| 199 | {
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| 200 | time_t maxtime, timeout;
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| 201 | long timeout_ms;
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| 202 | bool start = (state->state == TFTP_STATE_START) ? TRUE : FALSE;
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| 203 |
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| 204 | time(&state->start_time);
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| 205 |
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| 206 | /* Compute drop-dead time */
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| 207 | timeout_ms = Curl_timeleft(state->conn->data, NULL, start);
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| 208 |
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| 209 | if(timeout_ms < 0) {
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| 210 | /* time-out, bail out, go home */
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| 211 | failf(state->conn->data, "Connection time-out");
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| 212 | return CURLE_OPERATION_TIMEDOUT;
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| 213 | }
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| 214 |
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| 215 | if(start) {
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| 216 |
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| 217 | maxtime = (time_t)(timeout_ms + 500) / 1000;
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| 218 | state->max_time = state->start_time+maxtime;
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| 219 |
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| 220 | /* Set per-block timeout to total */
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| 221 | timeout = maxtime;
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| 222 |
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| 223 | /* Average restart after 5 seconds */
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| 224 | state->retry_max = (int)timeout/5;
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| 225 |
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| 226 | if(state->retry_max < 1)
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| 227 | /* avoid division by zero below */
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| 228 | state->retry_max = 1;
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| 229 |
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| 230 | /* Compute the re-start interval to suit the timeout */
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| 231 | state->retry_time = (int)timeout/state->retry_max;
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| 232 | if(state->retry_time<1)
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| 233 | state->retry_time=1;
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| 234 |
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| 235 | }
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| 236 | else {
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| 237 | if(timeout_ms > 0)
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| 238 | maxtime = (time_t)(timeout_ms + 500) / 1000;
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| 239 | else
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| 240 | maxtime = 3600;
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| 241 |
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| 242 | state->max_time = state->start_time+maxtime;
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| 243 |
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| 244 | /* Set per-block timeout to total */
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| 245 | timeout = maxtime;
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| 246 |
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| 247 | /* Average reposting an ACK after 5 seconds */
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| 248 | state->retry_max = (int)timeout/5;
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| 249 | }
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| 250 | /* But bound the total number */
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| 251 | if(state->retry_max<3)
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| 252 | state->retry_max=3;
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| 253 |
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| 254 | if(state->retry_max>50)
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| 255 | state->retry_max=50;
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| 256 |
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| 257 | /* Compute the re-ACK interval to suit the timeout */
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| 258 | state->retry_time = (int)(timeout/state->retry_max);
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| 259 | if(state->retry_time<1)
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| 260 | state->retry_time=1;
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| 261 |
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| 262 | infof(state->conn->data,
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| 263 | "set timeouts for state %d; Total %ld, retry %d maxtry %d\n",
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| 264 | (int)state->state, (long)(state->max_time-state->start_time),
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| 265 | state->retry_time, state->retry_max);
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| 266 |
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| 267 | /* init RX time */
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| 268 | time(&state->rx_time);
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| 269 |
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| 270 | return CURLE_OK;
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| 271 | }
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| 272 |
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| 273 | /**********************************************************
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| 274 | *
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| 275 | * tftp_set_send_first
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| 276 | *
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| 277 | * Event handler for the START state
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| 278 | *
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| 279 | **********************************************************/
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| 280 |
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| 281 | static void setpacketevent(tftp_packet_t *packet, unsigned short num)
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| 282 | {
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| 283 | packet->data[0] = (unsigned char)(num >> 8);
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| 284 | packet->data[1] = (unsigned char)(num & 0xff);
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| 285 | }
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| 286 |
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| 287 |
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| 288 | static void setpacketblock(tftp_packet_t *packet, unsigned short num)
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| 289 | {
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| 290 | packet->data[2] = (unsigned char)(num >> 8);
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| 291 | packet->data[3] = (unsigned char)(num & 0xff);
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| 292 | }
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| 293 |
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| 294 | static unsigned short getrpacketevent(const tftp_packet_t *packet)
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| 295 | {
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| 296 | return (unsigned short)((packet->data[0] << 8) | packet->data[1]);
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| 297 | }
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| 298 |
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| 299 | static unsigned short getrpacketblock(const tftp_packet_t *packet)
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| 300 | {
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| 301 | return (unsigned short)((packet->data[2] << 8) | packet->data[3]);
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| 302 | }
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| 303 |
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| 304 | static size_t Curl_strnlen(const char *string, size_t maxlen)
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| 305 | {
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| 306 | const char *end = memchr (string, '\0', maxlen);
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| 307 | return end ? (size_t) (end - string) : maxlen;
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| 308 | }
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| 309 |
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| 310 | static const char *tftp_option_get(const char *buf, size_t len,
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| 311 | const char **option, const char **value)
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| 312 | {
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| 313 | size_t loc;
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| 314 |
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| 315 | loc = Curl_strnlen( buf, len );
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| 316 | loc++; /* NULL term */
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| 317 |
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| 318 | if(loc >= len)
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| 319 | return NULL;
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| 320 | *option = buf;
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| 321 |
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| 322 | loc += Curl_strnlen( buf+loc, len-loc );
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| 323 | loc++; /* NULL term */
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| 324 |
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| 325 | if(loc > len)
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| 326 | return NULL;
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| 327 | *value = &buf[strlen(*option) + 1];
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| 328 |
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| 329 | return &buf[loc];
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| 330 | }
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| 331 |
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| 332 | static CURLcode tftp_parse_option_ack(tftp_state_data_t *state,
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| 333 | const char *ptr, int len)
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| 334 | {
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| 335 | const char *tmp = ptr;
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| 336 | struct SessionHandle *data = state->conn->data;
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| 337 |
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| 338 | /* if OACK doesn't contain blksize option, the default (512) must be used */
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| 339 | state->blksize = TFTP_BLKSIZE_DEFAULT;
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| 340 |
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| 341 | while(tmp < ptr + len) {
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| 342 | const char *option, *value;
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| 343 |
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| 344 | tmp = tftp_option_get(tmp, ptr + len - tmp, &option, &value);
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| 345 | if(tmp == NULL) {
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| 346 | failf(data, "Malformed ACK packet, rejecting");
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| 347 | return CURLE_TFTP_ILLEGAL;
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| 348 | }
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| 349 |
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| 350 | infof(data, "got option=(%s) value=(%s)\n", option, value);
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| 351 |
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| 352 | if(checkprefix(option, TFTP_OPTION_BLKSIZE)) {
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| 353 | long blksize;
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| 354 |
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| 355 | blksize = strtol( value, NULL, 10 );
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| 356 |
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| 357 | if(!blksize) {
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| 358 | failf(data, "invalid blocksize value in OACK packet");
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| 359 | return CURLE_TFTP_ILLEGAL;
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| 360 | }
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| 361 | else if(blksize > TFTP_BLKSIZE_MAX) {
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| 362 | failf(data, "%s (%d)", "blksize is larger than max supported",
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| 363 | TFTP_BLKSIZE_MAX);
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| 364 | return CURLE_TFTP_ILLEGAL;
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| 365 | }
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| 366 | else if(blksize < TFTP_BLKSIZE_MIN) {
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| 367 | failf(data, "%s (%d)", "blksize is smaller than min supported",
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| 368 | TFTP_BLKSIZE_MIN);
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| 369 | return CURLE_TFTP_ILLEGAL;
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| 370 | }
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| 371 | else if(blksize > state->requested_blksize) {
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| 372 | /* could realloc pkt buffers here, but the spec doesn't call out
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| 373 | * support for the server requesting a bigger blksize than the client
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| 374 | * requests */
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| 375 | failf(data, "%s (%ld)",
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| 376 | "server requested blksize larger than allocated", blksize);
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| 377 | return CURLE_TFTP_ILLEGAL;
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| 378 | }
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| 379 |
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| 380 | state->blksize = (int)blksize;
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| 381 | infof(data, "%s (%d) %s (%d)\n", "blksize parsed from OACK",
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| 382 | state->blksize, "requested", state->requested_blksize);
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| 383 | }
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| 384 | else if(checkprefix(option, TFTP_OPTION_TSIZE)) {
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| 385 | long tsize = 0;
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| 386 |
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| 387 | tsize = strtol( value, NULL, 10 );
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| 388 | infof(data, "%s (%ld)\n", "tsize parsed from OACK", tsize);
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| 389 |
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| 390 | /* tsize should be ignored on upload: Who cares about the size of the
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| 391 | remote file? */
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| 392 | if(!data->set.upload) {
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| 393 | if(!tsize) {
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| 394 | failf(data, "invalid tsize -:%s:- value in OACK packet", value);
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| 395 | return CURLE_TFTP_ILLEGAL;
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| 396 | }
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| 397 | Curl_pgrsSetDownloadSize(data, tsize);
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| 398 | }
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| 399 | }
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| 400 | }
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| 401 |
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| 402 | return CURLE_OK;
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| 403 | }
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| 404 |
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| 405 | static size_t tftp_option_add(tftp_state_data_t *state, size_t csize,
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| 406 | char *buf, const char *option)
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| 407 | {
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| 408 | if(( strlen(option) + csize + 1 ) > (size_t)state->blksize)
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| 409 | return 0;
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| 410 | strcpy(buf, option);
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| 411 | return strlen(option) + 1;
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| 412 | }
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| 413 |
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| 414 | static CURLcode tftp_connect_for_tx(tftp_state_data_t *state,
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| 415 | tftp_event_t event)
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| 416 | {
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| 417 | CURLcode result;
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| 418 | #ifndef CURL_DISABLE_VERBOSE_STRINGS
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| 419 | struct SessionHandle *data = state->conn->data;
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| 420 |
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| 421 | infof(data, "%s\n", "Connected for transmit");
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| 422 | #endif
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| 423 | state->state = TFTP_STATE_TX;
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| 424 | result = tftp_set_timeouts(state);
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| 425 | if(result)
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| 426 | return result;
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| 427 | return tftp_tx(state, event);
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| 428 | }
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| 429 |
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| 430 | static CURLcode tftp_connect_for_rx(tftp_state_data_t *state,
|
---|
| 431 | tftp_event_t event)
|
---|
| 432 | {
|
---|
| 433 | CURLcode result;
|
---|
| 434 | #ifndef CURL_DISABLE_VERBOSE_STRINGS
|
---|
| 435 | struct SessionHandle *data = state->conn->data;
|
---|
| 436 |
|
---|
| 437 | infof(data, "%s\n", "Connected for receive");
|
---|
| 438 | #endif
|
---|
| 439 | state->state = TFTP_STATE_RX;
|
---|
| 440 | result = tftp_set_timeouts(state);
|
---|
| 441 | if(result)
|
---|
| 442 | return result;
|
---|
| 443 | return tftp_rx(state, event);
|
---|
| 444 | }
|
---|
| 445 |
|
---|
| 446 | static CURLcode tftp_send_first(tftp_state_data_t *state, tftp_event_t event)
|
---|
| 447 | {
|
---|
| 448 | size_t sbytes;
|
---|
| 449 | ssize_t senddata;
|
---|
| 450 | const char *mode = "octet";
|
---|
| 451 | char *filename;
|
---|
| 452 | char buf[64];
|
---|
| 453 | struct SessionHandle *data = state->conn->data;
|
---|
| 454 | CURLcode result = CURLE_OK;
|
---|
| 455 |
|
---|
| 456 | /* Set ascii mode if -B flag was used */
|
---|
| 457 | if(data->set.prefer_ascii)
|
---|
| 458 | mode = "netascii";
|
---|
| 459 |
|
---|
| 460 | switch(event) {
|
---|
| 461 |
|
---|
| 462 | case TFTP_EVENT_INIT: /* Send the first packet out */
|
---|
| 463 | case TFTP_EVENT_TIMEOUT: /* Resend the first packet out */
|
---|
| 464 | /* Increment the retry counter, quit if over the limit */
|
---|
| 465 | state->retries++;
|
---|
| 466 | if(state->retries>state->retry_max) {
|
---|
| 467 | state->error = TFTP_ERR_NORESPONSE;
|
---|
| 468 | state->state = TFTP_STATE_FIN;
|
---|
| 469 | return result;
|
---|
| 470 | }
|
---|
| 471 |
|
---|
| 472 | if(data->set.upload) {
|
---|
| 473 | /* If we are uploading, send an WRQ */
|
---|
| 474 | setpacketevent(&state->spacket, TFTP_EVENT_WRQ);
|
---|
| 475 | state->conn->data->req.upload_fromhere =
|
---|
| 476 | (char *)state->spacket.data+4;
|
---|
| 477 | if(data->state.infilesize != -1)
|
---|
| 478 | Curl_pgrsSetUploadSize(data, data->state.infilesize);
|
---|
| 479 | }
|
---|
| 480 | else {
|
---|
| 481 | /* If we are downloading, send an RRQ */
|
---|
| 482 | setpacketevent(&state->spacket, TFTP_EVENT_RRQ);
|
---|
| 483 | }
|
---|
| 484 | /* As RFC3617 describes the separator slash is not actually part of the
|
---|
| 485 | file name so we skip the always-present first letter of the path
|
---|
| 486 | string. */
|
---|
| 487 | filename = curl_easy_unescape(data, &state->conn->data->state.path[1], 0,
|
---|
| 488 | NULL);
|
---|
| 489 | if(!filename)
|
---|
| 490 | return CURLE_OUT_OF_MEMORY;
|
---|
| 491 |
|
---|
| 492 | snprintf((char *)state->spacket.data+2,
|
---|
| 493 | state->blksize,
|
---|
| 494 | "%s%c%s%c", filename, '\0', mode, '\0');
|
---|
| 495 | sbytes = 4 + strlen(filename) + strlen(mode);
|
---|
| 496 |
|
---|
| 497 | /* add tsize option */
|
---|
| 498 | if(data->set.upload && (data->state.infilesize != -1))
|
---|
| 499 | snprintf(buf, sizeof(buf), "%" CURL_FORMAT_CURL_OFF_T,
|
---|
| 500 | data->state.infilesize);
|
---|
| 501 | else
|
---|
| 502 | strcpy(buf, "0"); /* the destination is large enough */
|
---|
| 503 |
|
---|
| 504 | sbytes += tftp_option_add(state, sbytes,
|
---|
| 505 | (char *)state->spacket.data+sbytes,
|
---|
| 506 | TFTP_OPTION_TSIZE);
|
---|
| 507 | sbytes += tftp_option_add(state, sbytes,
|
---|
| 508 | (char *)state->spacket.data+sbytes, buf);
|
---|
| 509 | /* add blksize option */
|
---|
| 510 | snprintf( buf, sizeof(buf), "%d", state->requested_blksize );
|
---|
| 511 | sbytes += tftp_option_add(state, sbytes,
|
---|
| 512 | (char *)state->spacket.data+sbytes,
|
---|
| 513 | TFTP_OPTION_BLKSIZE);
|
---|
| 514 | sbytes += tftp_option_add(state, sbytes,
|
---|
| 515 | (char *)state->spacket.data+sbytes, buf );
|
---|
| 516 |
|
---|
| 517 | /* add timeout option */
|
---|
| 518 | snprintf( buf, sizeof(buf), "%d", state->retry_time);
|
---|
| 519 | sbytes += tftp_option_add(state, sbytes,
|
---|
| 520 | (char *)state->spacket.data+sbytes,
|
---|
| 521 | TFTP_OPTION_INTERVAL);
|
---|
| 522 | sbytes += tftp_option_add(state, sbytes,
|
---|
| 523 | (char *)state->spacket.data+sbytes, buf );
|
---|
| 524 |
|
---|
| 525 | /* the typecase for the 3rd argument is mostly for systems that do
|
---|
| 526 | not have a size_t argument, like older unixes that want an 'int' */
|
---|
| 527 | senddata = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
| 528 | (SEND_TYPE_ARG3)sbytes, 0,
|
---|
| 529 | state->conn->ip_addr->ai_addr,
|
---|
| 530 | state->conn->ip_addr->ai_addrlen);
|
---|
| 531 | if(senddata != (ssize_t)sbytes) {
|
---|
| 532 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
| 533 | }
|
---|
| 534 | free(filename);
|
---|
| 535 | break;
|
---|
| 536 |
|
---|
| 537 | case TFTP_EVENT_OACK:
|
---|
| 538 | if(data->set.upload) {
|
---|
| 539 | result = tftp_connect_for_tx(state, event);
|
---|
| 540 | }
|
---|
| 541 | else {
|
---|
| 542 | result = tftp_connect_for_rx(state, event);
|
---|
| 543 | }
|
---|
| 544 | break;
|
---|
| 545 |
|
---|
| 546 | case TFTP_EVENT_ACK: /* Connected for transmit */
|
---|
| 547 | result = tftp_connect_for_tx(state, event);
|
---|
| 548 | break;
|
---|
| 549 |
|
---|
| 550 | case TFTP_EVENT_DATA: /* Connected for receive */
|
---|
| 551 | result = tftp_connect_for_rx(state, event);
|
---|
| 552 | break;
|
---|
| 553 |
|
---|
| 554 | case TFTP_EVENT_ERROR:
|
---|
| 555 | state->state = TFTP_STATE_FIN;
|
---|
| 556 | break;
|
---|
| 557 |
|
---|
| 558 | default:
|
---|
| 559 | failf(state->conn->data, "tftp_send_first: internal error");
|
---|
| 560 | break;
|
---|
| 561 | }
|
---|
| 562 |
|
---|
| 563 | return result;
|
---|
| 564 | }
|
---|
| 565 |
|
---|
| 566 | /* the next blocknum is x + 1 but it needs to wrap at an unsigned 16bit
|
---|
| 567 | boundary */
|
---|
| 568 | #define NEXT_BLOCKNUM(x) (((x)+1)&0xffff)
|
---|
| 569 |
|
---|
| 570 | /**********************************************************
|
---|
| 571 | *
|
---|
| 572 | * tftp_rx
|
---|
| 573 | *
|
---|
| 574 | * Event handler for the RX state
|
---|
| 575 | *
|
---|
| 576 | **********************************************************/
|
---|
| 577 | static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event)
|
---|
| 578 | {
|
---|
| 579 | ssize_t sbytes;
|
---|
| 580 | int rblock;
|
---|
| 581 | struct SessionHandle *data = state->conn->data;
|
---|
| 582 |
|
---|
| 583 | switch(event) {
|
---|
| 584 |
|
---|
| 585 | case TFTP_EVENT_DATA:
|
---|
| 586 | /* Is this the block we expect? */
|
---|
| 587 | rblock = getrpacketblock(&state->rpacket);
|
---|
| 588 | if(NEXT_BLOCKNUM(state->block) == rblock) {
|
---|
| 589 | /* This is the expected block. Reset counters and ACK it. */
|
---|
| 590 | state->retries = 0;
|
---|
| 591 | }
|
---|
| 592 | else if(state->block == rblock) {
|
---|
| 593 | /* This is the last recently received block again. Log it and ACK it
|
---|
| 594 | again. */
|
---|
| 595 | infof(data, "Received last DATA packet block %d again.\n", rblock);
|
---|
| 596 | }
|
---|
| 597 | else {
|
---|
| 598 | /* totally unexpected, just log it */
|
---|
| 599 | infof(data,
|
---|
| 600 | "Received unexpected DATA packet block %d, expecting block %d\n",
|
---|
| 601 | rblock, NEXT_BLOCKNUM(state->block));
|
---|
| 602 | break;
|
---|
| 603 | }
|
---|
| 604 |
|
---|
| 605 | /* ACK this block. */
|
---|
| 606 | state->block = (unsigned short)rblock;
|
---|
| 607 | setpacketevent(&state->spacket, TFTP_EVENT_ACK);
|
---|
| 608 | setpacketblock(&state->spacket, state->block);
|
---|
| 609 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
| 610 | 4, SEND_4TH_ARG,
|
---|
| 611 | (struct sockaddr *)&state->remote_addr,
|
---|
| 612 | state->remote_addrlen);
|
---|
| 613 | if(sbytes < 0) {
|
---|
| 614 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
| 615 | return CURLE_SEND_ERROR;
|
---|
| 616 | }
|
---|
| 617 |
|
---|
| 618 | /* Check if completed (That is, a less than full packet is received) */
|
---|
| 619 | if(state->rbytes < (ssize_t)state->blksize+4) {
|
---|
| 620 | state->state = TFTP_STATE_FIN;
|
---|
| 621 | }
|
---|
| 622 | else {
|
---|
| 623 | state->state = TFTP_STATE_RX;
|
---|
| 624 | }
|
---|
| 625 | time(&state->rx_time);
|
---|
| 626 | break;
|
---|
| 627 |
|
---|
| 628 | case TFTP_EVENT_OACK:
|
---|
| 629 | /* ACK option acknowledgement so we can move on to data */
|
---|
| 630 | state->block = 0;
|
---|
| 631 | state->retries = 0;
|
---|
| 632 | setpacketevent(&state->spacket, TFTP_EVENT_ACK);
|
---|
| 633 | setpacketblock(&state->spacket, state->block);
|
---|
| 634 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
| 635 | 4, SEND_4TH_ARG,
|
---|
| 636 | (struct sockaddr *)&state->remote_addr,
|
---|
| 637 | state->remote_addrlen);
|
---|
| 638 | if(sbytes < 0) {
|
---|
| 639 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
| 640 | return CURLE_SEND_ERROR;
|
---|
| 641 | }
|
---|
| 642 |
|
---|
| 643 | /* we're ready to RX data */
|
---|
| 644 | state->state = TFTP_STATE_RX;
|
---|
| 645 | time(&state->rx_time);
|
---|
| 646 | break;
|
---|
| 647 |
|
---|
| 648 | case TFTP_EVENT_TIMEOUT:
|
---|
| 649 | /* Increment the retry count and fail if over the limit */
|
---|
| 650 | state->retries++;
|
---|
| 651 | infof(data,
|
---|
| 652 | "Timeout waiting for block %d ACK. Retries = %d\n",
|
---|
| 653 | NEXT_BLOCKNUM(state->block), state->retries);
|
---|
| 654 | if(state->retries > state->retry_max) {
|
---|
| 655 | state->error = TFTP_ERR_TIMEOUT;
|
---|
| 656 | state->state = TFTP_STATE_FIN;
|
---|
| 657 | }
|
---|
| 658 | else {
|
---|
| 659 | /* Resend the previous ACK */
|
---|
| 660 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
| 661 | 4, SEND_4TH_ARG,
|
---|
| 662 | (struct sockaddr *)&state->remote_addr,
|
---|
| 663 | state->remote_addrlen);
|
---|
| 664 | if(sbytes<0) {
|
---|
| 665 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
| 666 | return CURLE_SEND_ERROR;
|
---|
| 667 | }
|
---|
| 668 | }
|
---|
| 669 | break;
|
---|
| 670 |
|
---|
| 671 | case TFTP_EVENT_ERROR:
|
---|
| 672 | setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
|
---|
| 673 | setpacketblock(&state->spacket, state->block);
|
---|
| 674 | (void)sendto(state->sockfd, (void *)state->spacket.data,
|
---|
| 675 | 4, SEND_4TH_ARG,
|
---|
| 676 | (struct sockaddr *)&state->remote_addr,
|
---|
| 677 | state->remote_addrlen);
|
---|
| 678 | /* don't bother with the return code, but if the socket is still up we
|
---|
| 679 | * should be a good TFTP client and let the server know we're done */
|
---|
| 680 | state->state = TFTP_STATE_FIN;
|
---|
| 681 | break;
|
---|
| 682 |
|
---|
| 683 | default:
|
---|
| 684 | failf(data, "%s", "tftp_rx: internal error");
|
---|
| 685 | return CURLE_TFTP_ILLEGAL; /* not really the perfect return code for
|
---|
| 686 | this */
|
---|
| 687 | }
|
---|
| 688 | return CURLE_OK;
|
---|
| 689 | }
|
---|
| 690 |
|
---|
| 691 | /**********************************************************
|
---|
| 692 | *
|
---|
| 693 | * tftp_tx
|
---|
| 694 | *
|
---|
| 695 | * Event handler for the TX state
|
---|
| 696 | *
|
---|
| 697 | **********************************************************/
|
---|
| 698 | static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event)
|
---|
| 699 | {
|
---|
| 700 | struct SessionHandle *data = state->conn->data;
|
---|
| 701 | ssize_t sbytes;
|
---|
| 702 | int rblock;
|
---|
| 703 | CURLcode result = CURLE_OK;
|
---|
| 704 | struct SingleRequest *k = &data->req;
|
---|
| 705 |
|
---|
| 706 | switch(event) {
|
---|
| 707 |
|
---|
| 708 | case TFTP_EVENT_ACK:
|
---|
| 709 | case TFTP_EVENT_OACK:
|
---|
| 710 | if(event == TFTP_EVENT_ACK) {
|
---|
| 711 | /* Ack the packet */
|
---|
| 712 | rblock = getrpacketblock(&state->rpacket);
|
---|
| 713 |
|
---|
| 714 | if(rblock != state->block &&
|
---|
| 715 | /* There's a bug in tftpd-hpa that causes it to send us an ack for
|
---|
| 716 | * 65535 when the block number wraps to 0. So when we're expecting
|
---|
| 717 | * 0, also accept 65535. See
|
---|
| 718 | * http://syslinux.zytor.com/archives/2010-September/015253.html
|
---|
| 719 | * */
|
---|
| 720 | !(state->block == 0 && rblock == 65535)) {
|
---|
| 721 | /* This isn't the expected block. Log it and up the retry counter */
|
---|
| 722 | infof(data, "Received ACK for block %d, expecting %d\n",
|
---|
| 723 | rblock, state->block);
|
---|
| 724 | state->retries++;
|
---|
| 725 | /* Bail out if over the maximum */
|
---|
| 726 | if(state->retries>state->retry_max) {
|
---|
| 727 | failf(data, "tftp_tx: giving up waiting for block %d ack",
|
---|
| 728 | state->block);
|
---|
| 729 | result = CURLE_SEND_ERROR;
|
---|
| 730 | }
|
---|
| 731 | else {
|
---|
| 732 | /* Re-send the data packet */
|
---|
| 733 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
| 734 | 4+state->sbytes, SEND_4TH_ARG,
|
---|
| 735 | (struct sockaddr *)&state->remote_addr,
|
---|
| 736 | state->remote_addrlen);
|
---|
| 737 | /* Check all sbytes were sent */
|
---|
| 738 | if(sbytes<0) {
|
---|
| 739 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
| 740 | result = CURLE_SEND_ERROR;
|
---|
| 741 | }
|
---|
| 742 | }
|
---|
| 743 |
|
---|
| 744 | return result;
|
---|
| 745 | }
|
---|
| 746 | /* This is the expected packet. Reset the counters and send the next
|
---|
| 747 | block */
|
---|
| 748 | time(&state->rx_time);
|
---|
| 749 | state->block++;
|
---|
| 750 | }
|
---|
| 751 | else
|
---|
| 752 | state->block = 1; /* first data block is 1 when using OACK */
|
---|
| 753 |
|
---|
| 754 | state->retries = 0;
|
---|
| 755 | setpacketevent(&state->spacket, TFTP_EVENT_DATA);
|
---|
| 756 | setpacketblock(&state->spacket, state->block);
|
---|
| 757 | if(state->block > 1 && state->sbytes < (int)state->blksize) {
|
---|
| 758 | state->state = TFTP_STATE_FIN;
|
---|
| 759 | return CURLE_OK;
|
---|
| 760 | }
|
---|
| 761 |
|
---|
| 762 | result = Curl_fillreadbuffer(state->conn, state->blksize, &state->sbytes);
|
---|
| 763 | if(result)
|
---|
| 764 | return result;
|
---|
| 765 |
|
---|
| 766 | sbytes = sendto(state->sockfd, (void *) state->spacket.data,
|
---|
| 767 | 4 + state->sbytes, SEND_4TH_ARG,
|
---|
| 768 | (struct sockaddr *)&state->remote_addr,
|
---|
| 769 | state->remote_addrlen);
|
---|
| 770 | /* Check all sbytes were sent */
|
---|
| 771 | if(sbytes<0) {
|
---|
| 772 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
| 773 | return CURLE_SEND_ERROR;
|
---|
| 774 | }
|
---|
| 775 | /* Update the progress meter */
|
---|
| 776 | k->writebytecount += state->sbytes;
|
---|
| 777 | Curl_pgrsSetUploadCounter(data, k->writebytecount);
|
---|
| 778 | break;
|
---|
| 779 |
|
---|
| 780 | case TFTP_EVENT_TIMEOUT:
|
---|
| 781 | /* Increment the retry counter and log the timeout */
|
---|
| 782 | state->retries++;
|
---|
| 783 | infof(data, "Timeout waiting for block %d ACK. "
|
---|
| 784 | " Retries = %d\n", NEXT_BLOCKNUM(state->block), state->retries);
|
---|
| 785 | /* Decide if we've had enough */
|
---|
| 786 | if(state->retries > state->retry_max) {
|
---|
| 787 | state->error = TFTP_ERR_TIMEOUT;
|
---|
| 788 | state->state = TFTP_STATE_FIN;
|
---|
| 789 | }
|
---|
| 790 | else {
|
---|
| 791 | /* Re-send the data packet */
|
---|
| 792 | sbytes = sendto(state->sockfd, (void *)state->spacket.data,
|
---|
| 793 | 4+state->sbytes, SEND_4TH_ARG,
|
---|
| 794 | (struct sockaddr *)&state->remote_addr,
|
---|
| 795 | state->remote_addrlen);
|
---|
| 796 | /* Check all sbytes were sent */
|
---|
| 797 | if(sbytes<0) {
|
---|
| 798 | failf(data, "%s", Curl_strerror(state->conn, SOCKERRNO));
|
---|
| 799 | return CURLE_SEND_ERROR;
|
---|
| 800 | }
|
---|
| 801 | /* since this was a re-send, we remain at the still byte position */
|
---|
| 802 | Curl_pgrsSetUploadCounter(data, k->writebytecount);
|
---|
| 803 | }
|
---|
| 804 | break;
|
---|
| 805 |
|
---|
| 806 | case TFTP_EVENT_ERROR:
|
---|
| 807 | state->state = TFTP_STATE_FIN;
|
---|
| 808 | setpacketevent(&state->spacket, TFTP_EVENT_ERROR);
|
---|
| 809 | setpacketblock(&state->spacket, state->block);
|
---|
| 810 | (void)sendto(state->sockfd, (void *)state->spacket.data, 4, SEND_4TH_ARG,
|
---|
| 811 | (struct sockaddr *)&state->remote_addr,
|
---|
| 812 | state->remote_addrlen);
|
---|
| 813 | /* don't bother with the return code, but if the socket is still up we
|
---|
| 814 | * should be a good TFTP client and let the server know we're done */
|
---|
| 815 | state->state = TFTP_STATE_FIN;
|
---|
| 816 | break;
|
---|
| 817 |
|
---|
| 818 | default:
|
---|
| 819 | failf(data, "tftp_tx: internal error, event: %i", (int)(event));
|
---|
| 820 | break;
|
---|
| 821 | }
|
---|
| 822 |
|
---|
| 823 | return result;
|
---|
| 824 | }
|
---|
| 825 |
|
---|
| 826 | /**********************************************************
|
---|
| 827 | *
|
---|
| 828 | * tftp_translate_code
|
---|
| 829 | *
|
---|
| 830 | * Translate internal error codes to CURL error codes
|
---|
| 831 | *
|
---|
| 832 | **********************************************************/
|
---|
| 833 | static CURLcode tftp_translate_code(tftp_error_t error)
|
---|
| 834 | {
|
---|
| 835 | CURLcode result = CURLE_OK;
|
---|
| 836 |
|
---|
| 837 | if(error != TFTP_ERR_NONE) {
|
---|
| 838 | switch(error) {
|
---|
| 839 | case TFTP_ERR_NOTFOUND:
|
---|
| 840 | result = CURLE_TFTP_NOTFOUND;
|
---|
| 841 | break;
|
---|
| 842 | case TFTP_ERR_PERM:
|
---|
| 843 | result = CURLE_TFTP_PERM;
|
---|
| 844 | break;
|
---|
| 845 | case TFTP_ERR_DISKFULL:
|
---|
| 846 | result = CURLE_REMOTE_DISK_FULL;
|
---|
| 847 | break;
|
---|
| 848 | case TFTP_ERR_UNDEF:
|
---|
| 849 | case TFTP_ERR_ILLEGAL:
|
---|
| 850 | result = CURLE_TFTP_ILLEGAL;
|
---|
| 851 | break;
|
---|
| 852 | case TFTP_ERR_UNKNOWNID:
|
---|
| 853 | result = CURLE_TFTP_UNKNOWNID;
|
---|
| 854 | break;
|
---|
| 855 | case TFTP_ERR_EXISTS:
|
---|
| 856 | result = CURLE_REMOTE_FILE_EXISTS;
|
---|
| 857 | break;
|
---|
| 858 | case TFTP_ERR_NOSUCHUSER:
|
---|
| 859 | result = CURLE_TFTP_NOSUCHUSER;
|
---|
| 860 | break;
|
---|
| 861 | case TFTP_ERR_TIMEOUT:
|
---|
| 862 | result = CURLE_OPERATION_TIMEDOUT;
|
---|
| 863 | break;
|
---|
| 864 | case TFTP_ERR_NORESPONSE:
|
---|
| 865 | result = CURLE_COULDNT_CONNECT;
|
---|
| 866 | break;
|
---|
| 867 | default:
|
---|
| 868 | result = CURLE_ABORTED_BY_CALLBACK;
|
---|
| 869 | break;
|
---|
| 870 | }
|
---|
| 871 | }
|
---|
| 872 | else
|
---|
| 873 | result = CURLE_OK;
|
---|
| 874 |
|
---|
| 875 | return result;
|
---|
| 876 | }
|
---|
| 877 |
|
---|
| 878 | /**********************************************************
|
---|
| 879 | *
|
---|
| 880 | * tftp_state_machine
|
---|
| 881 | *
|
---|
| 882 | * The tftp state machine event dispatcher
|
---|
| 883 | *
|
---|
| 884 | **********************************************************/
|
---|
| 885 | static CURLcode tftp_state_machine(tftp_state_data_t *state,
|
---|
| 886 | tftp_event_t event)
|
---|
| 887 | {
|
---|
| 888 | CURLcode result = CURLE_OK;
|
---|
| 889 | struct SessionHandle *data = state->conn->data;
|
---|
| 890 |
|
---|
| 891 | switch(state->state) {
|
---|
| 892 | case TFTP_STATE_START:
|
---|
| 893 | DEBUGF(infof(data, "TFTP_STATE_START\n"));
|
---|
| 894 | result = tftp_send_first(state, event);
|
---|
| 895 | break;
|
---|
| 896 | case TFTP_STATE_RX:
|
---|
| 897 | DEBUGF(infof(data, "TFTP_STATE_RX\n"));
|
---|
| 898 | result = tftp_rx(state, event);
|
---|
| 899 | break;
|
---|
| 900 | case TFTP_STATE_TX:
|
---|
| 901 | DEBUGF(infof(data, "TFTP_STATE_TX\n"));
|
---|
| 902 | result = tftp_tx(state, event);
|
---|
| 903 | break;
|
---|
| 904 | case TFTP_STATE_FIN:
|
---|
| 905 | infof(data, "%s\n", "TFTP finished");
|
---|
| 906 | break;
|
---|
| 907 | default:
|
---|
| 908 | DEBUGF(infof(data, "STATE: %d\n", state->state));
|
---|
| 909 | failf(data, "%s", "Internal state machine error");
|
---|
| 910 | result = CURLE_TFTP_ILLEGAL;
|
---|
| 911 | break;
|
---|
| 912 | }
|
---|
| 913 |
|
---|
| 914 | return result;
|
---|
| 915 | }
|
---|
| 916 |
|
---|
| 917 | /**********************************************************
|
---|
| 918 | *
|
---|
| 919 | * tftp_disconnect
|
---|
| 920 | *
|
---|
| 921 | * The disconnect callback
|
---|
| 922 | *
|
---|
| 923 | **********************************************************/
|
---|
| 924 | static CURLcode tftp_disconnect(struct connectdata *conn, bool dead_connection)
|
---|
| 925 | {
|
---|
| 926 | tftp_state_data_t *state = conn->proto.tftpc;
|
---|
| 927 | (void) dead_connection;
|
---|
| 928 |
|
---|
| 929 | /* done, free dynamically allocated pkt buffers */
|
---|
| 930 | if(state) {
|
---|
| 931 | Curl_safefree(state->rpacket.data);
|
---|
| 932 | Curl_safefree(state->spacket.data);
|
---|
| 933 | free(state);
|
---|
| 934 | }
|
---|
| 935 |
|
---|
| 936 | return CURLE_OK;
|
---|
| 937 | }
|
---|
| 938 |
|
---|
| 939 | /**********************************************************
|
---|
| 940 | *
|
---|
| 941 | * tftp_connect
|
---|
| 942 | *
|
---|
| 943 | * The connect callback
|
---|
| 944 | *
|
---|
| 945 | **********************************************************/
|
---|
| 946 | static CURLcode tftp_connect(struct connectdata *conn, bool *done)
|
---|
| 947 | {
|
---|
| 948 | tftp_state_data_t *state;
|
---|
| 949 | int blksize, rc;
|
---|
| 950 |
|
---|
| 951 | blksize = TFTP_BLKSIZE_DEFAULT;
|
---|
| 952 |
|
---|
| 953 | state = conn->proto.tftpc = calloc(1, sizeof(tftp_state_data_t));
|
---|
| 954 | if(!state)
|
---|
| 955 | return CURLE_OUT_OF_MEMORY;
|
---|
| 956 |
|
---|
| 957 | /* alloc pkt buffers based on specified blksize */
|
---|
| 958 | if(conn->data->set.tftp_blksize) {
|
---|
| 959 | blksize = (int)conn->data->set.tftp_blksize;
|
---|
| 960 | if(blksize > TFTP_BLKSIZE_MAX || blksize < TFTP_BLKSIZE_MIN )
|
---|
| 961 | return CURLE_TFTP_ILLEGAL;
|
---|
| 962 | }
|
---|
| 963 |
|
---|
| 964 | if(!state->rpacket.data) {
|
---|
| 965 | state->rpacket.data = calloc(1, blksize + 2 + 2);
|
---|
| 966 |
|
---|
| 967 | if(!state->rpacket.data)
|
---|
| 968 | return CURLE_OUT_OF_MEMORY;
|
---|
| 969 | }
|
---|
| 970 |
|
---|
| 971 | if(!state->spacket.data) {
|
---|
| 972 | state->spacket.data = calloc(1, blksize + 2 + 2);
|
---|
| 973 |
|
---|
| 974 | if(!state->spacket.data)
|
---|
| 975 | return CURLE_OUT_OF_MEMORY;
|
---|
| 976 | }
|
---|
| 977 |
|
---|
| 978 | /* we don't keep TFTP connections up bascially because there's none or very
|
---|
| 979 | * little gain for UDP */
|
---|
| 980 | connclose(conn, "TFTP");
|
---|
| 981 |
|
---|
| 982 | state->conn = conn;
|
---|
| 983 | state->sockfd = state->conn->sock[FIRSTSOCKET];
|
---|
| 984 | state->state = TFTP_STATE_START;
|
---|
| 985 | state->error = TFTP_ERR_NONE;
|
---|
| 986 | state->blksize = TFTP_BLKSIZE_DEFAULT;
|
---|
| 987 | state->requested_blksize = blksize;
|
---|
| 988 |
|
---|
| 989 | ((struct sockaddr *)&state->local_addr)->sa_family =
|
---|
| 990 | (unsigned short)(conn->ip_addr->ai_family);
|
---|
| 991 |
|
---|
| 992 | tftp_set_timeouts(state);
|
---|
| 993 |
|
---|
| 994 | if(!conn->bits.bound) {
|
---|
| 995 | /* If not already bound, bind to any interface, random UDP port. If it is
|
---|
| 996 | * reused or a custom local port was desired, this has already been done!
|
---|
| 997 | *
|
---|
| 998 | * We once used the size of the local_addr struct as the third argument
|
---|
| 999 | * for bind() to better work with IPv6 or whatever size the struct could
|
---|
| 1000 | * have, but we learned that at least Tru64, AIX and IRIX *requires* the
|
---|
| 1001 | * size of that argument to match the exact size of a 'sockaddr_in' struct
|
---|
| 1002 | * when running IPv4-only.
|
---|
| 1003 | *
|
---|
| 1004 | * Therefore we use the size from the address we connected to, which we
|
---|
| 1005 | * assume uses the same IP version and thus hopefully this works for both
|
---|
| 1006 | * IPv4 and IPv6...
|
---|
| 1007 | */
|
---|
| 1008 | rc = bind(state->sockfd, (struct sockaddr *)&state->local_addr,
|
---|
| 1009 | conn->ip_addr->ai_addrlen);
|
---|
| 1010 | if(rc) {
|
---|
| 1011 | failf(conn->data, "bind() failed; %s",
|
---|
| 1012 | Curl_strerror(conn, SOCKERRNO));
|
---|
| 1013 | return CURLE_COULDNT_CONNECT;
|
---|
| 1014 | }
|
---|
| 1015 | conn->bits.bound = TRUE;
|
---|
| 1016 | }
|
---|
| 1017 |
|
---|
| 1018 | Curl_pgrsStartNow(conn->data);
|
---|
| 1019 |
|
---|
| 1020 | *done = TRUE;
|
---|
| 1021 |
|
---|
| 1022 | return CURLE_OK;
|
---|
| 1023 | }
|
---|
| 1024 |
|
---|
| 1025 | /**********************************************************
|
---|
| 1026 | *
|
---|
| 1027 | * tftp_done
|
---|
| 1028 | *
|
---|
| 1029 | * The done callback
|
---|
| 1030 | *
|
---|
| 1031 | **********************************************************/
|
---|
| 1032 | static CURLcode tftp_done(struct connectdata *conn, CURLcode status,
|
---|
| 1033 | bool premature)
|
---|
| 1034 | {
|
---|
| 1035 | CURLcode result = CURLE_OK;
|
---|
| 1036 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
| 1037 |
|
---|
| 1038 | (void)status; /* unused */
|
---|
| 1039 | (void)premature; /* not used */
|
---|
| 1040 |
|
---|
| 1041 | if(Curl_pgrsDone(conn))
|
---|
| 1042 | return CURLE_ABORTED_BY_CALLBACK;
|
---|
| 1043 |
|
---|
| 1044 | /* If we have encountered an error */
|
---|
| 1045 | if(state)
|
---|
| 1046 | result = tftp_translate_code(state->error);
|
---|
| 1047 |
|
---|
| 1048 | return result;
|
---|
| 1049 | }
|
---|
| 1050 |
|
---|
| 1051 | /**********************************************************
|
---|
| 1052 | *
|
---|
| 1053 | * tftp_getsock
|
---|
| 1054 | *
|
---|
| 1055 | * The getsock callback
|
---|
| 1056 | *
|
---|
| 1057 | **********************************************************/
|
---|
| 1058 | static int tftp_getsock(struct connectdata *conn, curl_socket_t *socks,
|
---|
| 1059 | int numsocks)
|
---|
| 1060 | {
|
---|
| 1061 | if(!numsocks)
|
---|
| 1062 | return GETSOCK_BLANK;
|
---|
| 1063 |
|
---|
| 1064 | socks[0] = conn->sock[FIRSTSOCKET];
|
---|
| 1065 |
|
---|
| 1066 | return GETSOCK_READSOCK(0);
|
---|
| 1067 | }
|
---|
| 1068 |
|
---|
| 1069 | /**********************************************************
|
---|
| 1070 | *
|
---|
| 1071 | * tftp_receive_packet
|
---|
| 1072 | *
|
---|
| 1073 | * Called once select fires and data is ready on the socket
|
---|
| 1074 | *
|
---|
| 1075 | **********************************************************/
|
---|
| 1076 | static CURLcode tftp_receive_packet(struct connectdata *conn)
|
---|
| 1077 | {
|
---|
| 1078 | struct Curl_sockaddr_storage fromaddr;
|
---|
| 1079 | curl_socklen_t fromlen;
|
---|
| 1080 | CURLcode result = CURLE_OK;
|
---|
| 1081 | struct SessionHandle *data = conn->data;
|
---|
| 1082 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
| 1083 | struct SingleRequest *k = &data->req;
|
---|
| 1084 |
|
---|
| 1085 | /* Receive the packet */
|
---|
| 1086 | fromlen = sizeof(fromaddr);
|
---|
| 1087 | state->rbytes = (int)recvfrom(state->sockfd,
|
---|
| 1088 | (void *)state->rpacket.data,
|
---|
| 1089 | state->blksize+4,
|
---|
| 1090 | 0,
|
---|
| 1091 | (struct sockaddr *)&fromaddr,
|
---|
| 1092 | &fromlen);
|
---|
| 1093 | if(state->remote_addrlen==0) {
|
---|
| 1094 | memcpy(&state->remote_addr, &fromaddr, fromlen);
|
---|
| 1095 | state->remote_addrlen = fromlen;
|
---|
| 1096 | }
|
---|
| 1097 |
|
---|
| 1098 | /* Sanity check packet length */
|
---|
| 1099 | if(state->rbytes < 4) {
|
---|
| 1100 | failf(data, "Received too short packet");
|
---|
| 1101 | /* Not a timeout, but how best to handle it? */
|
---|
| 1102 | state->event = TFTP_EVENT_TIMEOUT;
|
---|
| 1103 | }
|
---|
| 1104 | else {
|
---|
| 1105 | /* The event is given by the TFTP packet time */
|
---|
| 1106 | state->event = (tftp_event_t)getrpacketevent(&state->rpacket);
|
---|
| 1107 |
|
---|
| 1108 | switch(state->event) {
|
---|
| 1109 | case TFTP_EVENT_DATA:
|
---|
| 1110 | /* Don't pass to the client empty or retransmitted packets */
|
---|
| 1111 | if(state->rbytes > 4 &&
|
---|
| 1112 | (NEXT_BLOCKNUM(state->block) == getrpacketblock(&state->rpacket))) {
|
---|
| 1113 | result = Curl_client_write(conn, CLIENTWRITE_BODY,
|
---|
| 1114 | (char *)state->rpacket.data+4,
|
---|
| 1115 | state->rbytes-4);
|
---|
| 1116 | if(result) {
|
---|
| 1117 | tftp_state_machine(state, TFTP_EVENT_ERROR);
|
---|
| 1118 | return result;
|
---|
| 1119 | }
|
---|
| 1120 | k->bytecount += state->rbytes-4;
|
---|
| 1121 | Curl_pgrsSetDownloadCounter(data, (curl_off_t) k->bytecount);
|
---|
| 1122 | }
|
---|
| 1123 | break;
|
---|
| 1124 | case TFTP_EVENT_ERROR:
|
---|
| 1125 | state->error = (tftp_error_t)getrpacketblock(&state->rpacket);
|
---|
| 1126 | infof(data, "%s\n", (const char *)state->rpacket.data+4);
|
---|
| 1127 | break;
|
---|
| 1128 | case TFTP_EVENT_ACK:
|
---|
| 1129 | break;
|
---|
| 1130 | case TFTP_EVENT_OACK:
|
---|
| 1131 | result = tftp_parse_option_ack(state,
|
---|
| 1132 | (const char *)state->rpacket.data+2,
|
---|
| 1133 | state->rbytes-2);
|
---|
| 1134 | if(result)
|
---|
| 1135 | return result;
|
---|
| 1136 | break;
|
---|
| 1137 | case TFTP_EVENT_RRQ:
|
---|
| 1138 | case TFTP_EVENT_WRQ:
|
---|
| 1139 | default:
|
---|
| 1140 | failf(data, "%s", "Internal error: Unexpected packet");
|
---|
| 1141 | break;
|
---|
| 1142 | }
|
---|
| 1143 |
|
---|
| 1144 | /* Update the progress meter */
|
---|
| 1145 | if(Curl_pgrsUpdate(conn)) {
|
---|
| 1146 | tftp_state_machine(state, TFTP_EVENT_ERROR);
|
---|
| 1147 | return CURLE_ABORTED_BY_CALLBACK;
|
---|
| 1148 | }
|
---|
| 1149 | }
|
---|
| 1150 | return result;
|
---|
| 1151 | }
|
---|
| 1152 |
|
---|
| 1153 | /**********************************************************
|
---|
| 1154 | *
|
---|
| 1155 | * tftp_state_timeout
|
---|
| 1156 | *
|
---|
| 1157 | * Check if timeouts have been reached
|
---|
| 1158 | *
|
---|
| 1159 | **********************************************************/
|
---|
| 1160 | static long tftp_state_timeout(struct connectdata *conn, tftp_event_t *event)
|
---|
| 1161 | {
|
---|
| 1162 | time_t current;
|
---|
| 1163 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
| 1164 |
|
---|
| 1165 | if(event)
|
---|
| 1166 | *event = TFTP_EVENT_NONE;
|
---|
| 1167 |
|
---|
| 1168 | time(¤t);
|
---|
| 1169 | if(current > state->max_time) {
|
---|
| 1170 | DEBUGF(infof(conn->data, "timeout: %ld > %ld\n",
|
---|
| 1171 | (long)current, (long)state->max_time));
|
---|
| 1172 | state->error = TFTP_ERR_TIMEOUT;
|
---|
| 1173 | state->state = TFTP_STATE_FIN;
|
---|
| 1174 | return 0;
|
---|
| 1175 | }
|
---|
| 1176 | else if(current > state->rx_time+state->retry_time) {
|
---|
| 1177 | if(event)
|
---|
| 1178 | *event = TFTP_EVENT_TIMEOUT;
|
---|
| 1179 | time(&state->rx_time); /* update even though we received nothing */
|
---|
| 1180 | }
|
---|
| 1181 |
|
---|
| 1182 | /* there's a typecast below here since 'time_t' may in fact be larger than
|
---|
| 1183 | 'long', but we estimate that a 'long' will still be able to hold number
|
---|
| 1184 | of seconds even if "only" 32 bit */
|
---|
| 1185 | return (long)(state->max_time - current);
|
---|
| 1186 | }
|
---|
| 1187 |
|
---|
| 1188 | /**********************************************************
|
---|
| 1189 | *
|
---|
| 1190 | * tftp_multi_statemach
|
---|
| 1191 | *
|
---|
| 1192 | * Handle single RX socket event and return
|
---|
| 1193 | *
|
---|
| 1194 | **********************************************************/
|
---|
| 1195 | static CURLcode tftp_multi_statemach(struct connectdata *conn, bool *done)
|
---|
| 1196 | {
|
---|
| 1197 | int rc;
|
---|
| 1198 | tftp_event_t event;
|
---|
| 1199 | CURLcode result = CURLE_OK;
|
---|
| 1200 | struct SessionHandle *data = conn->data;
|
---|
| 1201 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
| 1202 | long timeout_ms = tftp_state_timeout(conn, &event);
|
---|
| 1203 |
|
---|
| 1204 | *done = FALSE;
|
---|
| 1205 |
|
---|
| 1206 | if(timeout_ms <= 0) {
|
---|
| 1207 | failf(data, "TFTP response timeout");
|
---|
| 1208 | return CURLE_OPERATION_TIMEDOUT;
|
---|
| 1209 | }
|
---|
| 1210 | else if(event != TFTP_EVENT_NONE) {
|
---|
| 1211 | result = tftp_state_machine(state, event);
|
---|
| 1212 | if(result)
|
---|
| 1213 | return result;
|
---|
| 1214 | *done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
|
---|
| 1215 | if(*done)
|
---|
| 1216 | /* Tell curl we're done */
|
---|
| 1217 | Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
|
---|
| 1218 | }
|
---|
| 1219 | else {
|
---|
| 1220 | /* no timeouts to handle, check our socket */
|
---|
| 1221 | rc = Curl_socket_ready(state->sockfd, CURL_SOCKET_BAD, 0);
|
---|
| 1222 |
|
---|
| 1223 | if(rc == -1) {
|
---|
| 1224 | /* bail out */
|
---|
| 1225 | int error = SOCKERRNO;
|
---|
| 1226 | failf(data, "%s", Curl_strerror(conn, error));
|
---|
| 1227 | state->event = TFTP_EVENT_ERROR;
|
---|
| 1228 | }
|
---|
| 1229 | else if(rc != 0) {
|
---|
| 1230 | result = tftp_receive_packet(conn);
|
---|
| 1231 | if(result)
|
---|
| 1232 | return result;
|
---|
| 1233 | result = tftp_state_machine(state, state->event);
|
---|
| 1234 | if(result)
|
---|
| 1235 | return result;
|
---|
| 1236 | *done = (state->state == TFTP_STATE_FIN) ? TRUE : FALSE;
|
---|
| 1237 | if(*done)
|
---|
| 1238 | /* Tell curl we're done */
|
---|
| 1239 | Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
|
---|
| 1240 | }
|
---|
| 1241 | /* if rc == 0, then select() timed out */
|
---|
| 1242 | }
|
---|
| 1243 |
|
---|
| 1244 | return result;
|
---|
| 1245 | }
|
---|
| 1246 |
|
---|
| 1247 | /**********************************************************
|
---|
| 1248 | *
|
---|
| 1249 | * tftp_doing
|
---|
| 1250 | *
|
---|
| 1251 | * Called from multi.c while DOing
|
---|
| 1252 | *
|
---|
| 1253 | **********************************************************/
|
---|
| 1254 | static CURLcode tftp_doing(struct connectdata *conn, bool *dophase_done)
|
---|
| 1255 | {
|
---|
| 1256 | CURLcode result;
|
---|
| 1257 | result = tftp_multi_statemach(conn, dophase_done);
|
---|
| 1258 |
|
---|
| 1259 | if(*dophase_done) {
|
---|
| 1260 | DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
---|
| 1261 | }
|
---|
| 1262 | else if(!result) {
|
---|
| 1263 | /* The multi code doesn't have this logic for the DOING state so we
|
---|
| 1264 | provide it for TFTP since it may do the entire transfer in this
|
---|
| 1265 | state. */
|
---|
| 1266 | if(Curl_pgrsUpdate(conn))
|
---|
| 1267 | result = CURLE_ABORTED_BY_CALLBACK;
|
---|
| 1268 | else
|
---|
| 1269 | result = Curl_speedcheck(conn->data, Curl_tvnow());
|
---|
| 1270 | }
|
---|
| 1271 | return result;
|
---|
| 1272 | }
|
---|
| 1273 |
|
---|
| 1274 | /**********************************************************
|
---|
| 1275 | *
|
---|
| 1276 | * tftp_peform
|
---|
| 1277 | *
|
---|
| 1278 | * Entry point for transfer from tftp_do, sarts state mach
|
---|
| 1279 | *
|
---|
| 1280 | **********************************************************/
|
---|
| 1281 | static CURLcode tftp_perform(struct connectdata *conn, bool *dophase_done)
|
---|
| 1282 | {
|
---|
| 1283 | CURLcode result = CURLE_OK;
|
---|
| 1284 | tftp_state_data_t *state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
| 1285 |
|
---|
| 1286 | *dophase_done = FALSE;
|
---|
| 1287 |
|
---|
| 1288 | result = tftp_state_machine(state, TFTP_EVENT_INIT);
|
---|
| 1289 |
|
---|
| 1290 | if((state->state == TFTP_STATE_FIN) || result)
|
---|
| 1291 | return result;
|
---|
| 1292 |
|
---|
| 1293 | tftp_multi_statemach(conn, dophase_done);
|
---|
| 1294 |
|
---|
| 1295 | if(*dophase_done)
|
---|
| 1296 | DEBUGF(infof(conn->data, "DO phase is complete\n"));
|
---|
| 1297 |
|
---|
| 1298 | return result;
|
---|
| 1299 | }
|
---|
| 1300 |
|
---|
| 1301 |
|
---|
| 1302 | /**********************************************************
|
---|
| 1303 | *
|
---|
| 1304 | * tftp_do
|
---|
| 1305 | *
|
---|
| 1306 | * The do callback
|
---|
| 1307 | *
|
---|
| 1308 | * This callback initiates the TFTP transfer
|
---|
| 1309 | *
|
---|
| 1310 | **********************************************************/
|
---|
| 1311 |
|
---|
| 1312 | static CURLcode tftp_do(struct connectdata *conn, bool *done)
|
---|
| 1313 | {
|
---|
| 1314 | tftp_state_data_t *state;
|
---|
| 1315 | CURLcode result;
|
---|
| 1316 |
|
---|
| 1317 | *done = FALSE;
|
---|
| 1318 |
|
---|
| 1319 | if(!conn->proto.tftpc) {
|
---|
| 1320 | result = tftp_connect(conn, done);
|
---|
| 1321 | if(result)
|
---|
| 1322 | return result;
|
---|
| 1323 | }
|
---|
| 1324 |
|
---|
| 1325 | state = (tftp_state_data_t *)conn->proto.tftpc;
|
---|
| 1326 | if(!state)
|
---|
| 1327 | return CURLE_BAD_CALLING_ORDER;
|
---|
| 1328 |
|
---|
| 1329 | result = tftp_perform(conn, done);
|
---|
| 1330 |
|
---|
| 1331 | /* If tftp_perform() returned an error, use that for return code. If it
|
---|
| 1332 | was OK, see if tftp_translate_code() has an error. */
|
---|
| 1333 | if(!result)
|
---|
| 1334 | /* If we have encountered an internal tftp error, translate it. */
|
---|
| 1335 | result = tftp_translate_code(state->error);
|
---|
| 1336 |
|
---|
| 1337 | return result;
|
---|
| 1338 | }
|
---|
| 1339 |
|
---|
| 1340 | static CURLcode tftp_setup_connection(struct connectdata * conn)
|
---|
| 1341 | {
|
---|
| 1342 | struct SessionHandle *data = conn->data;
|
---|
| 1343 | char * type;
|
---|
| 1344 | char command;
|
---|
| 1345 |
|
---|
| 1346 | conn->socktype = SOCK_DGRAM; /* UDP datagram based */
|
---|
| 1347 |
|
---|
| 1348 | /* TFTP URLs support an extension like ";mode=<typecode>" that
|
---|
| 1349 | * we'll try to get now! */
|
---|
| 1350 | type = strstr(data->state.path, ";mode=");
|
---|
| 1351 |
|
---|
| 1352 | if(!type)
|
---|
| 1353 | type = strstr(conn->host.rawalloc, ";mode=");
|
---|
| 1354 |
|
---|
| 1355 | if(type) {
|
---|
| 1356 | *type = 0; /* it was in the middle of the hostname */
|
---|
| 1357 | command = Curl_raw_toupper(type[6]);
|
---|
| 1358 |
|
---|
| 1359 | switch (command) {
|
---|
| 1360 | case 'A': /* ASCII mode */
|
---|
| 1361 | case 'N': /* NETASCII mode */
|
---|
| 1362 | data->set.prefer_ascii = TRUE;
|
---|
| 1363 | break;
|
---|
| 1364 |
|
---|
| 1365 | case 'O': /* octet mode */
|
---|
| 1366 | case 'I': /* binary mode */
|
---|
| 1367 | default:
|
---|
| 1368 | /* switch off ASCII */
|
---|
| 1369 | data->set.prefer_ascii = FALSE;
|
---|
| 1370 | break;
|
---|
| 1371 | }
|
---|
| 1372 | }
|
---|
| 1373 |
|
---|
| 1374 | return CURLE_OK;
|
---|
| 1375 | }
|
---|
| 1376 | #endif
|
---|