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curl/lib/tftp.c
Dan Fandrich 9f44a95522 Renamed several libcurl error codes and options to make them more general 
and allow reuse by multiple protocols. Several unused error codes were
removed.  In all cases, macros were added to preserve source (and binary)
compatibility with the old names.  These macros are subject to removal at
a future date, but probably not before 2009.  An application can be
tested to see if it is using any obsolete code by compiling it with the
CURL_NO_OLDIES macro defined.

Documented some newer error codes in libcurl-error(3)
2007-08-30 20:34:57 +00:00

834 lines
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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 */
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;
((struct sockaddr *)&state->local_addr)->sa_family =
(unsigned short)(conn->ip_addr->ai_family);
tftp_set_timeouts(state);
if(!conn->bits.reuse) {
/* If not reused, bind to any interface, random UDP port. If it is reused,
* 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;
}
}
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) {
/* 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_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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