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curl/lib/tftp.c

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C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
#include "setup.h"
#ifndef CURL_DISABLE_TFTP
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#if defined(WIN32)
#include <time.h>
#include <io.h>
#else
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <netinet/in.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <netdb.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#include <sys/ioctl.h>
#include <signal.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#endif /* WIN32 */
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "tftp.h"
#include "progress.h"
#include "connect.h"
#include "strerror.h"
#include "sockaddr.h" /* required for Curl_sockaddr_storage */
#include "url.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "memory.h"
#include "select.h"
/* The last #include file should be: */
#include "memdebug.h"
/* RFC2348 allows the block size to be negotiated, but we don't support that */
#define TFTP_BLOCKSIZE 512
typedef enum {
TFTP_MODE_NETASCII=0,
TFTP_MODE_OCTET
} tftp_mode_t;
typedef enum {
TFTP_STATE_START=0,
TFTP_STATE_RX,
TFTP_STATE_TX,
TFTP_STATE_FIN
} tftp_state_t;
typedef enum {
TFTP_EVENT_INIT=0,
TFTP_EVENT_RRQ = 1,
TFTP_EVENT_WRQ = 2,
TFTP_EVENT_DATA = 3,
TFTP_EVENT_ACK = 4,
TFTP_EVENT_ERROR = 5,
TFTP_EVENT_TIMEOUT
} tftp_event_t;
typedef enum {
TFTP_ERR_UNDEF=0,
TFTP_ERR_NOTFOUND,
TFTP_ERR_PERM,
TFTP_ERR_DISKFULL,
TFTP_ERR_ILLEGAL,
TFTP_ERR_UNKNOWNID,
TFTP_ERR_EXISTS,
TFTP_ERR_NOSUCHUSER, /* This will never be triggered by this code */
/* The remaining error codes are internal to curl */
TFTP_ERR_NONE = -100,
TFTP_ERR_TIMEOUT,
TFTP_ERR_NORESPONSE
} tftp_error_t;
typedef struct tftp_packet {
unsigned char data[2 + 2 + TFTP_BLOCKSIZE];
} tftp_packet_t;
typedef struct tftp_state_data {
tftp_state_t state;
tftp_mode_t mode;
tftp_error_t error;
struct connectdata *conn;
curl_socket_t sockfd;
int retries;
int retry_time;
int retry_max;
time_t start_time;
time_t max_time;
unsigned short block;
struct Curl_sockaddr_storage local_addr;
struct Curl_sockaddr_storage remote_addr;
socklen_t remote_addrlen;
int rbytes;
int sbytes;
tftp_packet_t rpacket;
tftp_packet_t spacket;
} tftp_state_data_t;
/* Forward declarations */
static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event) ;
static CURLcode tftp_tx(tftp_state_data_t *state, tftp_event_t event) ;
/**********************************************************
*
* tftp_set_timeouts -
*
* Set timeouts based on state machine state.
* Use user provided connect timeouts until DATA or ACK
* packet is received, then use user-provided transfer timeouts
*
*
**********************************************************/
static void tftp_set_timeouts(tftp_state_data_t *state)
{
struct SessionHandle *data = state->conn->data;
time_t maxtime, timeout;
time(&state->start_time);
if(state->state == TFTP_STATE_START) {
/* Compute drop-dead time */
maxtime = (time_t)(data->set.connecttimeout/1000L?
data->set.connecttimeout/1000L:30);
state->max_time = state->start_time+maxtime;
/* Set per-block timeout to total */
timeout = maxtime ;
/* Average restart after 5 seconds */
state->retry_max = timeout/5;
if(state->retry_max < 1)
/* avoid division by zero below */
state->retry_max = 1;
/* Compute the re-start interval to suit the timeout */
state->retry_time = timeout/state->retry_max;
if(state->retry_time<1)
state->retry_time=1;
}
else {
/* Compute drop-dead time */
maxtime = (time_t)(data->set.timeout/1000L?
data->set.timeout/1000L:3600);
state->max_time = state->start_time+maxtime;
/* Set per-block timeout to 10% of total */
timeout = maxtime/10 ;
/* Average reposting an ACK after 15 seconds */
state->retry_max = timeout/15;
}
/* But bound the total number */
if(state->retry_max<3)
state->retry_max=3;
if(state->retry_max>50)
state->retry_max=50;
/* Compute the re-ACK interval to suit the timeout */
state->retry_time = timeout/state->retry_max;
if(state->retry_time<1)
state->retry_time=1;
infof(data, "set timeouts for state %d; Total %d, retry %d maxtry %d\n",
state->state, (state->max_time-state->start_time),
state->retry_time, state->retry_max);
}
/**********************************************************
*
* tftp_set_send_first
*
* Event handler for the START state
*
**********************************************************/
static void setpacketevent(tftp_packet_t *packet, unsigned short num)
{
packet->data[0] = (unsigned char)(num >> 8);
packet->data[1] = (unsigned char)(num & 0xff);
}
static void setpacketblock(tftp_packet_t *packet, unsigned short num)
{
packet->data[2] = (unsigned char)(num >> 8);
packet->data[3] = (unsigned char)(num & 0xff);
}
static unsigned short getrpacketevent(const tftp_packet_t *packet)
{
return (unsigned short)((packet->data[0] << 8) | packet->data[1]);
}
static unsigned short getrpacketblock(const tftp_packet_t *packet)
{
return (unsigned short)((packet->data[2] << 8) | packet->data[3]);
}
static CURLcode tftp_send_first(tftp_state_data_t *state, tftp_event_t event)
{
int sbytes;
const char *mode = "octet";
char *filename;
struct SessionHandle *data = state->conn->data;
CURLcode res = CURLE_OK;
/* Set ascii mode if -B flag was used */
if(data->set.prefer_ascii)
mode = "netascii";
switch(event) {
case TFTP_EVENT_INIT: /* Send the first packet out */
case TFTP_EVENT_TIMEOUT: /* Resend the first packet out */
/* Increment the retry counter, quit if over the limit */
state->retries++;
if(state->retries>state->retry_max) {
state->error = TFTP_ERR_NORESPONSE;
state->state = TFTP_STATE_FIN;
return res;
}
if(data->set.upload) {
/* If we are uploading, send an WRQ */
setpacketevent(&state->spacket, TFTP_EVENT_WRQ);
state->conn->data->reqdata.upload_fromhere = (char *)&state->spacket.data[4];
if(data->set.infilesize != -1)
Curl_pgrsSetUploadSize(data, data->set.infilesize);
}
else {
/* If we are downloading, send an RRQ */
setpacketevent(&state->spacket, TFTP_EVENT_RRQ);
}
/* As RFC3617 describes the separator slash is not actually part of the
file name so we skip the always-present first letter of the path string. */
filename = curl_easy_unescape(data, &state->conn->data->reqdata.path[1], 0,
NULL);
if (!filename)
return CURLE_OUT_OF_MEMORY;
snprintf((char *)&state->spacket.data[2],
TFTP_BLOCKSIZE,
"%s%c%s%c", filename, '\0', mode, '\0');
sbytes = 4 + (int)strlen(filename) + (int)strlen(mode);
sbytes = sendto(state->sockfd, (void *)&state->spacket,
sbytes, 0,
state->conn->ip_addr->ai_addr,
state->conn->ip_addr->ai_addrlen);
if(sbytes < 0) {
failf(data, "%s\n", Curl_strerror(state->conn, SOCKERRNO));
}
Curl_safefree(filename);
break;
case TFTP_EVENT_ACK: /* Connected for transmit */
infof(data, "%s\n", "Connected for transmit");
state->state = TFTP_STATE_TX;
tftp_set_timeouts(state);
return tftp_tx(state, event);
case TFTP_EVENT_DATA: /* connected for receive */
infof(data, "%s\n", "Connected for receive");
state->state = TFTP_STATE_RX;
tftp_set_timeouts(state);
return tftp_rx(state, event);
case TFTP_EVENT_ERROR:
state->state = TFTP_STATE_FIN;
break;
default:
failf(state->conn->data, "tftp_send_first: internal error\n");
break;
}
return res;
}
/**********************************************************
*
* tftp_rx
*
* Event handler for the RX state
*
**********************************************************/
static CURLcode tftp_rx(tftp_state_data_t *state, tftp_event_t event)
{
int sbytes;
int rblock;
struct SessionHandle *data = state->conn->data;
switch(event) {
case TFTP_EVENT_DATA:
/* Is this the block we expect? */
rblock = getrpacketblock(&state->rpacket);
if ((state->block+1) != rblock) {
/* No, log it, up the retry count and fail if over the limit */
infof(data,
"Received unexpected DATA packet block %d\n", rblock);
state->retries++;
if (state->retries>state->retry_max) {
failf(data, "tftp_rx: giving up waiting for block %d\n",
state->block+1);
return CURLE_TFTP_ILLEGAL;
}
}
/* This is the expected block. Reset counters and ACK it. */
state->block = (unsigned short)rblock;
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\n", Curl_strerror(state->conn, SOCKERRNO));
return CURLE_SEND_ERROR;
}
/* Check if completed (That is, a less than full packet is received) */
if (state->rbytes < (int)sizeof(state->spacket)){
state->state = TFTP_STATE_FIN;
}
else {
state->state = TFTP_STATE_RX;
}
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\n", 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,
4, SEND_4TH_ARG,
(struct sockaddr *)&state->remote_addr,
state->remote_addrlen);
/* Check all sbytes were sent */
if(sbytes<0) {
failf(data, "%s\n", Curl_strerror(state->conn, SOCKERRNO));
return CURLE_SEND_ERROR;
}
}
break;
case TFTP_EVENT_ERROR:
state->state = TFTP_STATE_FIN;
break;
default:
failf(data, "%s\n", "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(tftp_state_data_t *state, tftp_event_t event)
{
struct SessionHandle *data = state->conn->data;
int sbytes;
int rblock;
CURLcode res = CURLE_OK;
struct Curl_transfer_keeper *k = &data->reqdata.keep;
switch(event) {
case TFTP_EVENT_ACK:
/* Ack the packet */
rblock = getrpacketblock(&state->rpacket);
if(rblock != state->block) {
/* This isn't the expected block. Log it and up the retry counter */
infof(data, "Received ACK for block %d, expecting %d\n",
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);
res = CURLE_SEND_ERROR;
}
else {
/* Re-send the data packet */
sbytes = sendto(state->sockfd, (void *)&state->spacket,
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\n", Curl_strerror(state->conn, SOCKERRNO));
res = CURLE_SEND_ERROR;
}
}
return res;
}
/* This is the expected packet. Reset the counters and send the next
block */
state->block++;
state->retries = 0;
setpacketevent(&state->spacket, TFTP_EVENT_DATA);
setpacketblock(&state->spacket, state->block);
if(state->block > 1 && state->sbytes < TFTP_BLOCKSIZE) {
state->state = TFTP_STATE_FIN;
return CURLE_OK;
}
res = Curl_fillreadbuffer(state->conn, TFTP_BLOCKSIZE, &state->sbytes);
if(res)
return res;
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\n", Curl_strerror(state->conn, SOCKERRNO));
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\n", 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,
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\n", Curl_strerror(state->conn, SOCKERRNO));
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;
break;
default:
failf(data, "%s\n", "tftp_tx: internal error");
break;
}
return res;
}
/**********************************************************
*
* tftp_state_machine
*
* The tftp state machine event dispatcher
*
**********************************************************/
static CURLcode tftp_state_machine(tftp_state_data_t *state,
tftp_event_t event)
{
CURLcode res = CURLE_OK;
struct SessionHandle *data = state->conn->data;
switch(state->state) {
case TFTP_STATE_START:
DEBUGF(infof(data, "TFTP_STATE_START\n"));
res = tftp_send_first(state, event);
break;
case TFTP_STATE_RX:
DEBUGF(infof(data, "TFTP_STATE_RX\n"));
res = tftp_rx(state, event);
break;
case TFTP_STATE_TX:
DEBUGF(infof(data, "TFTP_STATE_TX\n"));
res = tftp_tx(state, event);
break;
case TFTP_STATE_FIN:
infof(data, "%s\n", "TFTP finished");
break;
default:
DEBUGF(infof(data, "STATE: %d\n", state->state));
failf(data, "%s\n", "Internal state machine error");
res = CURLE_TFTP_ILLEGAL;
break;
}
return res;
}
/**********************************************************
*
* Curl_tftp_connect
*
* The connect callback
*
**********************************************************/
CURLcode Curl_tftp_connect(struct connectdata *conn, bool *done)
{
CURLcode code;
tftp_state_data_t *state;
int rc;
state = conn->data->reqdata.proto.tftp = calloc(sizeof(tftp_state_data_t),
1);
if(!state)
return CURLE_OUT_OF_MEMORY;
conn->bits.close = FALSE; /* keep it open if possible */
state->conn = conn;
state->sockfd = state->conn->sock[FIRSTSOCKET];
state->state = TFTP_STATE_START;
state->error = TFTP_ERR_NONE;
((struct sockaddr *)&state->local_addr)->sa_family =
(unsigned short)(conn->ip_addr->ai_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...
*/
rc = bind(state->sockfd, (struct sockaddr *)&state->local_addr,
conn->ip_addr->ai_addrlen);
if(rc) {
failf(conn->data, "bind() failed; %s\n",
Curl_strerror(conn, SOCKERRNO));
return CURLE_COULDNT_CONNECT;
}
conn->bits.bound = TRUE;
}
Curl_pgrsStartNow(conn->data);
*done = TRUE;
code = CURLE_OK;
return(code);
}
/**********************************************************
*
* Curl_tftp_done
*
* The done callback
*
**********************************************************/
CURLcode Curl_tftp_done(struct connectdata *conn, CURLcode status,
bool premature)
{
(void)status; /* unused */
(void)premature; /* not used */
#if 0
free(conn->data->reqdata.proto.tftp);
conn->data->reqdata.proto.tftp = NULL;
#endif
Curl_pgrsDone(conn);
return CURLE_OK;
}
/**********************************************************
*
* Curl_tftp
*
* The do callback
*
* This callback handles the entire TFTP transfer
*
**********************************************************/
CURLcode Curl_tftp(struct connectdata *conn, bool *done)
{
struct SessionHandle *data = conn->data;
tftp_state_data_t *state =
(tftp_state_data_t *) conn->data->reqdata.proto.tftp;
tftp_event_t event;
CURLcode code;
int rc;
struct Curl_sockaddr_storage fromaddr;
socklen_t fromlen;
int check_time = 0;
struct Curl_transfer_keeper *k = &data->reqdata.keep;
*done = TRUE;
/*
Since connections can be re-used between SessionHandles, this might be a
connection already existing but on a fresh SessionHandle struct so we must
make sure we have a good 'struct TFTP' to play with. For new connections,
the struct TFTP is allocated and setup in the Curl_tftp_connect() function.
*/
if(!state) {
code = Curl_tftp_connect(conn, done);
if(code)
return code;
state = (tftp_state_data_t *)conn->data->reqdata.proto.tftp;
}
code = Curl_readwrite_init(conn);
if(code)
return code;
/* Run the TFTP State Machine */
for(code=tftp_state_machine(state, TFTP_EVENT_INIT);
(state->state != TFTP_STATE_FIN) && (code == CURLE_OK);
code=tftp_state_machine(state, event) ) {
/* Wait until ready to read or timeout occurs */
rc=Curl_socket_ready(state->sockfd, CURL_SOCKET_BAD,
state->retry_time * 1000);
if(rc == -1) {
/* bail out */
int error = SOCKERRNO;
failf(data, "%s\n", Curl_strerror(conn, error));
event = TFTP_EVENT_ERROR;
}
else if (rc==0) {
/* A timeout occured */
event = TFTP_EVENT_TIMEOUT;
/* Force a look at transfer timeouts */
check_time = 0;
}
else {
/* Receive the packet */
fromlen=sizeof(fromaddr);
state->rbytes = recvfrom(state->sockfd,
(void *)&state->rpacket, sizeof(state->rpacket),
0, (struct sockaddr *)&fromaddr, &fromlen);
if(state->remote_addrlen==0) {
memcpy(&state->remote_addr, &fromaddr, fromlen);
state->remote_addrlen = fromlen;
}
/* Sanity check packet length */
if (state->rbytes < 4) {
failf(conn->data, "Received too short packet\n");
/* Not a timeout, but how best to handle it? */
event = TFTP_EVENT_TIMEOUT;
}
else {
/* The event is given by the TFTP packet time */
event = (tftp_event_t)getrpacketevent(&state->rpacket);
switch(event) {
case TFTP_EVENT_DATA:
/* Don't pass to the client empty or retransmitted packets */
if (state->rbytes > 4 &&
((state->block+1) == getrpacketblock(&state->rpacket))) {
code = Curl_client_write(conn, CLIENTWRITE_BODY,
(char *)&state->rpacket.data[4],
state->rbytes-4);
if(code)
return code;
k->bytecount += state->rbytes-4;
Curl_pgrsSetDownloadCounter(data, (curl_off_t) k->bytecount);
}
break;
case TFTP_EVENT_ERROR:
state->error = (tftp_error_t)getrpacketblock(&state->rpacket);
infof(conn->data, "%s\n", (char *)&state->rpacket.data[4]);
break;
case TFTP_EVENT_ACK:
break;
case TFTP_EVENT_RRQ:
case TFTP_EVENT_WRQ:
default:
failf(conn->data, "%s\n", "Internal error: Unexpected packet");
break;
}
/* Update the progress meter */
if(Curl_pgrsUpdate(conn))
return CURLE_ABORTED_BY_CALLBACK;
}
}
/* Check for transfer timeout every 10 blocks, or after timeout */
if(check_time%10==0) {
time_t current;
time(&current);
if(current>state->max_time) {
DEBUGF(infof(data, "timeout: %d > %d\n",
current, state->max_time));
state->error = TFTP_ERR_TIMEOUT;
state->state = TFTP_STATE_FIN;
}
}
}
if(code)
return code;
/* Tell curl we're done */
code = Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
if(code)
return code;
/* If we have encountered an error */
if(state->error != TFTP_ERR_NONE) {
/* Translate internal error codes to curl error codes */
switch(state->error) {
case TFTP_ERR_NOTFOUND:
code = CURLE_TFTP_NOTFOUND;
break;
case TFTP_ERR_PERM:
code = CURLE_TFTP_PERM;
break;
case TFTP_ERR_DISKFULL:
code = CURLE_REMOTE_DISK_FULL;
break;
case TFTP_ERR_UNDEF:
case TFTP_ERR_ILLEGAL:
code = CURLE_TFTP_ILLEGAL;
break;
case TFTP_ERR_UNKNOWNID:
code = CURLE_TFTP_UNKNOWNID;
break;
case TFTP_ERR_EXISTS:
code = CURLE_REMOTE_FILE_EXISTS;
break;
case TFTP_ERR_NOSUCHUSER:
code = CURLE_TFTP_NOSUCHUSER;
break;
case TFTP_ERR_TIMEOUT:
code = CURLE_OPERATION_TIMEDOUT;
break;
case TFTP_ERR_NORESPONSE:
code = CURLE_COULDNT_CONNECT;
break;
default:
code= CURLE_ABORTED_BY_CALLBACK;
break;
}
}
else
code = CURLE_OK;
return code;
}
#endif
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