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eb7753437ff858ebe34a08baef7dfdb45eb0f018
rtems/cpukit/libnetworking/lib/tftpDriver.c
Sebastian Huber eb7753437f Filesystem: Delete unused fsmountme_h handler
2015-02-09 15:38:48 +01:00

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/*
* Trivial File Transfer Protocol (RFC 1350)
*
* Transfer file to/from remote host
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*
* Modifications to support reference counting in the file system are
* Copyright (c) 2012 embedded brains GmbH.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <malloc.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <rtems.h>
#include <rtems/libio_.h>
#include <rtems/seterr.h>
#include <rtems/rtems_bsdnet.h>
#include <rtems/tftp.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifdef RTEMS_TFTP_DRIVER_DEBUG
int rtems_tftp_driver_debug = 1;
#endif
/*
* Range of UDP ports to try
*/
#define UDP_PORT_BASE 3180
/*
* Default limits
*/
#define PACKET_FIRST_TIMEOUT_MILLISECONDS 400L
#define PACKET_TIMEOUT_MILLISECONDS 6000L
#define OPEN_RETRY_LIMIT 10
#define IO_RETRY_LIMIT 10
/*
* TFTP opcodes
*/
#define TFTP_OPCODE_RRQ 1
#define TFTP_OPCODE_WRQ 2
#define TFTP_OPCODE_DATA 3
#define TFTP_OPCODE_ACK 4
#define TFTP_OPCODE_ERROR 5
/*
* Largest data transfer
*/
#define TFTP_BUFSIZE 512
/*
* Packets transferred between machines
*/
union tftpPacket {
/*
* RRQ/WRQ packet
*/
struct tftpRWRQ {
uint16_t opcode;
char filename_mode[TFTP_BUFSIZE];
} tftpRWRQ;
/*
* DATA packet
*/
struct tftpDATA {
uint16_t opcode;
uint16_t blocknum;
uint8_t data[TFTP_BUFSIZE];
} tftpDATA;
/*
* ACK packet
*/
struct tftpACK {
uint16_t opcode;
uint16_t blocknum;
} tftpACK;
/*
* ERROR packet
*/
struct tftpERROR {
uint16_t opcode;
uint16_t errorCode;
char errorMessage[TFTP_BUFSIZE];
} tftpERROR;
};
/*
* State of each TFTP stream
*/
struct tftpStream {
/*
* Buffer for storing most recently-received packet
*/
union tftpPacket pkbuf;
/*
* Last block number transferred
*/
uint16_t blocknum;
/*
* Data transfer socket
*/
int socket;
struct sockaddr_in myAddress;
struct sockaddr_in farAddress;
/*
* Indices into buffer
*/
int nleft;
int nused;
/*
* Flags
*/
int firstReply;
int eof;
int writing;
};
/*
* Flags for filesystem info.
*/
#define TFTPFS_VERBOSE (1 << 0)
/*
* TFTP File system info.
*/
typedef struct tftpfs_info_s {
uint32_t flags;
rtems_id tftp_mutex;
int nStreams;
struct tftpStream ** volatile tftpStreams;
} tftpfs_info_t;
#define tftpfs_info_mount_table(_mt) ((tftpfs_info_t*) ((_mt)->fs_info))
#define tftpfs_info_pathloc(_pl) ((tftpfs_info_t*) ((_pl)->mt_entry->fs_info))
#define tftpfs_info_iop(_iop) (tftpfs_info_pathloc (&((_iop)->pathinfo)))
/*
* Number of streams open at the same time
*/
static const rtems_filesystem_operations_table rtems_tftp_ops;
static const rtems_filesystem_file_handlers_r rtems_tftp_handlers;
static bool rtems_tftp_is_directory(
const char *path,
size_t pathlen
)
{
return path [pathlen - 1] == '/';
}
int rtems_tftpfs_initialize(
rtems_filesystem_mount_table_entry_t *mt_entry,
const void *data
)
{
rtems_status_code sc;
const char *device = mt_entry->dev;
size_t devicelen = strlen (device);
tftpfs_info_t *fs;
char *root_path;
if (devicelen == 0)
rtems_set_errno_and_return_minus_one (ENXIO);
fs = malloc (sizeof (*fs));
root_path = malloc (devicelen + 2);
if (root_path == NULL || fs == NULL)
goto error;
root_path = memcpy (root_path, device, devicelen);
root_path [devicelen] = '/';
root_path [devicelen + 1] = '\0';
fs->flags = 0;
fs->nStreams = 0;
fs->tftpStreams = 0;
mt_entry->fs_info = fs;
mt_entry->mt_fs_root->location.node_access = root_path;
mt_entry->mt_fs_root->location.handlers = &rtems_tftp_handlers;
mt_entry->ops = &rtems_tftp_ops;
/*
* Now allocate a semaphore for mutual exclusion.
*
* NOTE: This could be in an fsinfo for this filesystem type.
*/
sc = rtems_semaphore_create (
rtems_build_name('T', 'F', 'T', 'P'),
1,
RTEMS_FIFO |
RTEMS_BINARY_SEMAPHORE |
RTEMS_NO_INHERIT_PRIORITY |
RTEMS_NO_PRIORITY_CEILING |
RTEMS_LOCAL,
0,
&fs->tftp_mutex
);
if (sc != RTEMS_SUCCESSFUL)
goto error;
if (data) {
char* config = (char*) data;
char* token;
char* saveptr;
token = strtok_r (config, " ", &saveptr);
while (token) {
if (strcmp (token, "verbose") == 0)
fs->flags |= TFTPFS_VERBOSE;
token = strtok_r (NULL, " ", &saveptr);
}
}
return 0;
error:
free (fs);
free (root_path);
rtems_set_errno_and_return_minus_one (ENOMEM);
}
/*
* Release a stream and clear the pointer to it
*/
static void
releaseStream (tftpfs_info_t *fs, int s)
{
if (fs->tftpStreams[s] && (fs->tftpStreams[s]->socket >= 0))
close (fs->tftpStreams[s]->socket);
rtems_semaphore_obtain (fs->tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
free (fs->tftpStreams[s]);
fs->tftpStreams[s] = NULL;
rtems_semaphore_release (fs->tftp_mutex);
}
static void
rtems_tftpfs_shutdown (rtems_filesystem_mount_table_entry_t* mt_entry)
{
tftpfs_info_t *fs = tftpfs_info_mount_table (mt_entry);
int s;
for (s = 0; s < fs->nStreams; s++)
releaseStream (fs, s);
rtems_semaphore_delete (fs->tftp_mutex);
free (fs);
free (mt_entry->mt_fs_root->location.node_access);
}
/*
* Map error message
*/
static int
tftpErrno (struct tftpStream *tp)
{
unsigned int tftpError;
static const int errorMap[] = {
EINVAL,
ENOENT,
EPERM,
ENOSPC,
EINVAL,
ENXIO,
EEXIST,
ESRCH,
};
tftpError = ntohs (tp->pkbuf.tftpERROR.errorCode);
if (tftpError < (sizeof errorMap / sizeof errorMap[0]))
return errorMap[tftpError];
else
return 1000 + tftpError;
}
/*
* Send a message to make the other end shut up
*/
static void
sendStifle (struct tftpStream *tp, struct sockaddr_in *to)
{
int len;
struct {
uint16_t opcode;
uint16_t errorCode;
char errorMessage[12];
} msg;
/*
* Create the error packet (Unknown transfer ID).
*/
msg.opcode = htons (TFTP_OPCODE_ERROR);
msg.errorCode = htons (5);
len = sizeof msg.opcode + sizeof msg.errorCode + 1;
len += sprintf (msg.errorMessage, "GO AWAY");
/*
* Send it
*/
sendto (tp->socket, (char *)&msg, len, 0, (struct sockaddr *)to, sizeof *to);
}
/*
* Wait for a data packet
*/
static int
getPacket (struct tftpStream *tp, int retryCount)
{
int len;
struct timeval tv;
if (retryCount == 0) {
tv.tv_sec = PACKET_FIRST_TIMEOUT_MILLISECONDS / 1000L;
tv.tv_usec = (PACKET_FIRST_TIMEOUT_MILLISECONDS % 1000L) * 1000L;
}
else {
tv.tv_sec = PACKET_TIMEOUT_MILLISECONDS / 1000L;
tv.tv_usec = (PACKET_TIMEOUT_MILLISECONDS % 1000L) * 1000L;
}
setsockopt (tp->socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv);
for (;;) {
union {
struct sockaddr s;
struct sockaddr_in i;
} from;
socklen_t fromlen = sizeof from;
len = recvfrom (tp->socket, &tp->pkbuf,
sizeof tp->pkbuf, 0,
&from.s, &fromlen);
if (len < 0)
break;
if (from.i.sin_addr.s_addr == tp->farAddress.sin_addr.s_addr) {
if (tp->firstReply) {
tp->firstReply = 0;
tp->farAddress.sin_port = from.i.sin_port;
}
if (tp->farAddress.sin_port == from.i.sin_port)
break;
}
/*
* Packet is from someone with whom we are
* not interested. Tell them to go away.
*/
sendStifle (tp, &from.i);
}
tv.tv_sec = 0;
tv.tv_usec = 0;
setsockopt (tp->socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv);
#ifdef RTEMS_TFTP_DRIVER_DEBUG
if (rtems_tftp_driver_debug) {
if (len >= (int) sizeof tp->pkbuf.tftpACK) {
int opcode = ntohs (tp->pkbuf.tftpDATA.opcode);
switch (opcode) {
default:
printf ("TFTP: OPCODE %d\n", opcode);
break;
case TFTP_OPCODE_DATA:
printf ("TFTP: RECV %d\n", ntohs (tp->pkbuf.tftpDATA.blocknum));
break;
case TFTP_OPCODE_ACK:
printf ("TFTP: GOT ACK %d\n", ntohs (tp->pkbuf.tftpACK.blocknum));
break;
}
}
else {
printf ("TFTP: %d-byte packet\n", len);
}
}
#endif
return len;
}
/*
* Send an acknowledgement
*/
static int
sendAck (struct tftpStream *tp)
{
#ifdef RTEMS_TFTP_DRIVER_DEBUG
if (rtems_tftp_driver_debug)
printf ("TFTP: ACK %d\n", tp->blocknum);
#endif
/*
* Create the acknowledgement
*/
tp->pkbuf.tftpACK.opcode = htons (TFTP_OPCODE_ACK);
tp->pkbuf.tftpACK.blocknum = htons (tp->blocknum);
/*
* Send it
*/
if (sendto (tp->socket, (char *)&tp->pkbuf, sizeof tp->pkbuf.tftpACK, 0,
(struct sockaddr *)&tp->farAddress,
sizeof tp->farAddress) < 0)
return errno;
return 0;
}
/*
* Convert a path to canonical form
*/
static void
fixPath (char *path)
{
char *inp, *outp, *base;
outp = inp = path;
base = NULL;
for (;;) {
if (inp[0] == '.') {
if (inp[1] == '\0')
break;
if (inp[1] == '/') {
inp += 2;
continue;
}
if (inp[1] == '.') {
if (inp[2] == '\0') {
if ((base != NULL) && (outp > base)) {
outp--;
while ((outp > base) && (outp[-1] != '/'))
outp--;
}
break;
}
if (inp[2] == '/') {
inp += 3;
if (base == NULL)
continue;
if (outp > base) {
outp--;
while ((outp > base) && (outp[-1] != '/'))
outp--;
}
continue;
}
}
}
if (base == NULL)
base = inp;
while (inp[0] != '/') {
if ((*outp++ = *inp++) == '\0')
return;
}
*outp++ = '/';
while (inp[0] == '/')
inp++;
}
*outp = '\0';
return;
}
static void rtems_tftp_eval_path(rtems_filesystem_eval_path_context_t *self)
{
int eval_flags = rtems_filesystem_eval_path_get_flags (self);
if ((eval_flags & RTEMS_FS_MAKE) == 0) {
int rw = RTEMS_FS_PERMS_READ | RTEMS_FS_PERMS_WRITE;
if ((eval_flags & rw) != rw) {
rtems_filesystem_location_info_t *currentloc =
rtems_filesystem_eval_path_get_currentloc (self);
char *current = currentloc->node_access;
size_t currentlen = strlen (current);
const char *path = rtems_filesystem_eval_path_get_path (self);
size_t pathlen = rtems_filesystem_eval_path_get_pathlen (self);
size_t len = currentlen + pathlen;
rtems_filesystem_eval_path_clear_path (self);
current = realloc (current, len + 1);
if (current != NULL) {
memcpy (current + currentlen, path, pathlen);
current [len] = '\0';
if (!rtems_tftp_is_directory (current, len)) {
fixPath (current);
}
currentloc->node_access = current;
} else {
rtems_filesystem_eval_path_error (self, ENOMEM);
}
} else {
rtems_filesystem_eval_path_error (self, EINVAL);
}
} else {
rtems_filesystem_eval_path_error (self, EIO);
}
}
/*
* The routine which does most of the work for the IMFS open handler
*/
static int rtems_tftp_open_worker(
rtems_libio_t *iop,
char *full_path_name,
int oflag
)
{
tftpfs_info_t *fs;
struct tftpStream *tp;
int retryCount;
struct in_addr farAddress;
int s;
int len;
char *cp1;
char *cp2;
char *remoteFilename;
rtems_interval now;
rtems_status_code sc;
char *hostname;
/*
* Get the file system info.
*/
fs = tftpfs_info_iop (iop);
/*
* Extract the host name component
*/
hostname = full_path_name;
cp1 = strchr (full_path_name, ':');
if (!cp1)
hostname = "BOOTP_HOST";
else {
*cp1 = '\0';
++cp1;
}
/*
* Convert hostname to Internet address
*/
if (strcmp (hostname, "BOOTP_HOST") == 0)
farAddress = rtems_bsdnet_bootp_server_address;
else if (inet_aton (hostname, &farAddress) == 0) {
struct hostent *he = gethostbyname(hostname);
if (he == NULL)
return ENOENT;
memcpy (&farAddress, he->h_addr, sizeof (farAddress));
}
/*
* Extract file pathname component
*/
if (strcmp (cp1, "BOOTP_FILE") == 0) {
cp1 = rtems_bsdnet_bootp_boot_file_name;
}
if (*cp1 == '\0')
return ENOENT;
remoteFilename = cp1;
if (strlen (remoteFilename) > (TFTP_BUFSIZE - 10))
return ENOENT;
/*
* Find a free stream
*/
sc = rtems_semaphore_obtain (fs->tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
return EBUSY;
for (s = 0 ; s < fs->nStreams ; s++) {
if (fs->tftpStreams[s] == NULL)
break;
}
if (s == fs->nStreams) {
/*
* Reallocate stream pointers
* Guard against the case where realloc() returns NULL.
*/
struct tftpStream **np;
np = realloc (fs->tftpStreams, ++fs->nStreams * sizeof *fs->tftpStreams);
if (np == NULL) {
rtems_semaphore_release (fs->tftp_mutex);
return ENOMEM;
}
fs->tftpStreams = np;
}
tp = fs->tftpStreams[s] = malloc (sizeof (struct tftpStream));
rtems_semaphore_release (fs->tftp_mutex);
if (tp == NULL)
return ENOMEM;
iop->data0 = s;
iop->data1 = tp;
/*
* Create the socket
*/
if ((tp->socket = socket (AF_INET, SOCK_DGRAM, 0)) < 0) {
releaseStream (fs, s);
return ENOMEM;
}
/*
* Bind the socket to a local address
*/
retryCount = 0;
now = rtems_clock_get_ticks_since_boot();
for (;;) {
int try = (now + retryCount) % 10;
tp->myAddress.sin_family = AF_INET;
tp->myAddress.sin_port = htons (UDP_PORT_BASE + fs->nStreams * try + s);
tp->myAddress.sin_addr.s_addr = htonl (INADDR_ANY);
if (bind (tp->socket, (struct sockaddr *)&tp->myAddress, sizeof tp->myAddress) >= 0)
break;
if (++retryCount == 10) {
releaseStream (fs, s);
return EBUSY;
}
}
/*
* Set the UDP destination to the TFTP server
* port on the remote machine.
*/
tp->farAddress.sin_family = AF_INET;
tp->farAddress.sin_addr = farAddress;
tp->farAddress.sin_port = htons (69);
/*
* Start the transfer
*/
tp->firstReply = 1;
retryCount = 0;
for (;;) {
/*
* Create the request
*/
if ((oflag & O_ACCMODE) == O_RDONLY) {
tp->writing = 0;
tp->pkbuf.tftpRWRQ.opcode = htons (TFTP_OPCODE_RRQ);
}
else {
tp->writing = 1;
tp->pkbuf.tftpRWRQ.opcode = htons (TFTP_OPCODE_WRQ);
}
cp1 = (char *) tp->pkbuf.tftpRWRQ.filename_mode;
cp2 = (char *) remoteFilename;
while ((*cp1++ = *cp2++) != '\0')
continue;
cp2 = "octet";
while ((*cp1++ = *cp2++) != '\0')
continue;
len = cp1 - (char *)&tp->pkbuf.tftpRWRQ;
/*
* Send the request
*/
if (sendto (tp->socket, (char *)&tp->pkbuf, len, 0,
(struct sockaddr *)&tp->farAddress,
sizeof tp->farAddress) < 0) {
releaseStream (fs, s);
return EIO;
}
/*
* Get reply
*/
len = getPacket (tp, retryCount);
if (len >= (int) sizeof tp->pkbuf.tftpACK) {
int opcode = ntohs (tp->pkbuf.tftpDATA.opcode);
if (!tp->writing
&& (opcode == TFTP_OPCODE_DATA)
&& (ntohs (tp->pkbuf.tftpDATA.blocknum) == 1)) {
tp->nused = 0;
tp->blocknum = 1;
tp->nleft = len - 2 * sizeof (uint16_t );
tp->eof = (tp->nleft < TFTP_BUFSIZE);
if (sendAck (tp) != 0) {
releaseStream (fs, s);
return EIO;
}
break;
}
if (tp->writing
&& (opcode == TFTP_OPCODE_ACK)
&& (ntohs (tp->pkbuf.tftpACK.blocknum) == 0)) {
tp->nused = 0;
tp->blocknum = 1;
break;
}
if (opcode == TFTP_OPCODE_ERROR) {
int e = tftpErrno (tp);
releaseStream (fs, s);
return e;
}
}
/*
* Keep trying
*/
if (++retryCount >= OPEN_RETRY_LIMIT) {
releaseStream (fs, s);
return EIO;
}
}
return 0;
}
static int rtems_tftp_open(
rtems_libio_t *iop,
const char *new_name,
int oflag,
mode_t mode
)
{
tftpfs_info_t *fs;
char *full_path_name;
int err;
full_path_name = iop->pathinfo.node_access;
if (rtems_tftp_is_directory (full_path_name, strlen (full_path_name))) {
rtems_set_errno_and_return_minus_one (ENOTSUP);
}
/*
* Get the file system info.
*/
fs = tftpfs_info_iop (iop);
if (fs->flags & TFTPFS_VERBOSE)
printf ("TFTPFS: %s\n", full_path_name);
err = rtems_tftp_open_worker (iop, full_path_name, oflag);
if (err != 0) {
rtems_set_errno_and_return_minus_one (err);
}
return 0;
}
/*
* Read from a TFTP stream
*/
static ssize_t rtems_tftp_read(
rtems_libio_t *iop,
void *buffer,
size_t count
)
{
char *bp;
struct tftpStream *tp = iop->data1;
int retryCount;
int nwant;
if (!tp)
rtems_set_errno_and_return_minus_one( EIO );
/*
* Read till user request is satisfied or EOF is reached
*/
bp = buffer;
nwant = count;
while (nwant) {
if (tp->nleft) {
int ncopy;
if (nwant < tp->nleft)
ncopy = nwant;
else
ncopy = tp->nleft;
memcpy (bp, &tp->pkbuf.tftpDATA.data[tp->nused], ncopy);
tp->nused += ncopy;
tp->nleft -= ncopy;
bp += ncopy;
nwant -= ncopy;
if (nwant == 0)
break;
}
if (tp->eof)
break;
/*
* Wait for the next packet
*/
retryCount = 0;
for (;;) {
int len = getPacket (tp, retryCount);
if (len >= (int)sizeof tp->pkbuf.tftpACK) {
int opcode = ntohs (tp->pkbuf.tftpDATA.opcode);
uint16_t nextBlock = tp->blocknum + 1;
if ((opcode == TFTP_OPCODE_DATA)
&& (ntohs (tp->pkbuf.tftpDATA.blocknum) == nextBlock)) {
tp->nused = 0;
tp->nleft = len - 2 * sizeof (uint16_t);
tp->eof = (tp->nleft < TFTP_BUFSIZE);
tp->blocknum++;
if (sendAck (tp) != 0)
rtems_set_errno_and_return_minus_one (EIO);
break;
}
if (opcode == TFTP_OPCODE_ERROR)
rtems_set_errno_and_return_minus_one (tftpErrno (tp));
}
/*
* Keep trying?
*/
if (++retryCount == IO_RETRY_LIMIT)
rtems_set_errno_and_return_minus_one (EIO);
if (sendAck (tp) != 0)
rtems_set_errno_and_return_minus_one (EIO);
}
}
return count - nwant;
}
/*
* Flush a write buffer and wait for acknowledgement
*/
static int rtems_tftp_flush (struct tftpStream *tp)
{
int wlen, rlen;
int retryCount = 0;
wlen = tp->nused + 2 * sizeof (uint16_t );
for (;;) {
tp->pkbuf.tftpDATA.opcode = htons (TFTP_OPCODE_DATA);
tp->pkbuf.tftpDATA.blocknum = htons (tp->blocknum);
#ifdef RTEMS_TFTP_DRIVER_DEBUG
if (rtems_tftp_driver_debug)
printf ("TFTP: SEND %d (%d)\n", tp->blocknum, tp->nused);
#endif
if (sendto (tp->socket, (char *)&tp->pkbuf, wlen, 0,
(struct sockaddr *)&tp->farAddress,
sizeof tp->farAddress) < 0)
return EIO;
rlen = getPacket (tp, retryCount);
/*
* Our last packet won't necessarily be acknowledged!
*/
if ((rlen < 0) && (tp->nused < sizeof tp->pkbuf.tftpDATA.data))
return 0;
if (rlen >= (int)sizeof tp->pkbuf.tftpACK) {
int opcode = ntohs (tp->pkbuf.tftpACK.opcode);
if ((opcode == TFTP_OPCODE_ACK)
&& (ntohs (tp->pkbuf.tftpACK.blocknum) == tp->blocknum)) {
tp->nused = 0;
tp->blocknum++;
return 0;
}
if (opcode == TFTP_OPCODE_ERROR)
return tftpErrno (tp);
}
/*
* Keep trying?
*/
if (++retryCount == IO_RETRY_LIMIT)
return EIO;
}
}
/*
* Close a TFTP stream
*/
static int rtems_tftp_close(
rtems_libio_t *iop
)
{
tftpfs_info_t *fs;
struct tftpStream *tp = iop->data1;
int e = 0;
/*
* Get the file system info.
*/
fs = tftpfs_info_iop (iop);
if (!tp)
rtems_set_errno_and_return_minus_one (EIO);
if (tp->writing)
e = rtems_tftp_flush (tp);
if (!tp->eof && !tp->firstReply) {
/*
* Tell the other end to stop
*/
rtems_interval ticksPerSecond;
sendStifle (tp, &tp->farAddress);
ticksPerSecond = rtems_clock_get_ticks_per_second();
rtems_task_wake_after (1 + ticksPerSecond / 10);
}
releaseStream (fs, iop->data0);
rtems_set_errno_and_return_minus_one (e);
}
static ssize_t rtems_tftp_write(
rtems_libio_t *iop,
const void *buffer,
size_t count
)
{
const char *bp;
struct tftpStream *tp = iop->data1;
int nleft, nfree, ncopy;
/*
* Bail out if an error has occurred
*/
if (!tp->writing)
rtems_set_errno_and_return_minus_one (EIO);
/*
* Write till user request is satisfied
* Notice that the buffer is flushed as soon as it is filled rather
* than waiting for the next write or a close. This ensures that
* the flush in close writes a less than full buffer so the far
* end can detect the end-of-file condition.
*/
bp = buffer;
nleft = count;
while (nleft) {
nfree = sizeof tp->pkbuf.tftpDATA.data - tp->nused;
if (nleft < nfree)
ncopy = nleft;
else
ncopy = nfree;
memcpy (&tp->pkbuf.tftpDATA.data[tp->nused], bp, ncopy);
tp->nused += ncopy;
nleft -= ncopy;
bp += ncopy;
if (tp->nused == sizeof tp->pkbuf.tftpDATA.data) {
int e = rtems_tftp_flush (tp);
if (e) {
tp->writing = 0;
rtems_set_errno_and_return_minus_one (e);
}
}
}
return count;
}
/*
* Dummy version to let fopen(xxxx,"w") work properly.
*/
static int rtems_tftp_ftruncate(
rtems_libio_t *iop __attribute__((unused)),
off_t count __attribute__((unused))
)
{
return 0;
}
static int rtems_tftp_fstat(
const rtems_filesystem_location_info_t *loc,
struct stat *buf
)
{
const char *path = loc->node_access;
size_t pathlen = strlen (path);
buf->st_mode = S_IRWXU | S_IRWXG | S_IRWXO
| (rtems_tftp_is_directory (path, pathlen) ? S_IFDIR : S_IFREG);
return 0;
}
static int rtems_tftp_clone(
rtems_filesystem_location_info_t *loc
)
{
int rv = 0;
loc->node_access = strdup (loc->node_access);
if (loc->node_access == NULL) {
errno = ENOMEM;
rv = -1;
}
return rv;
}
static void rtems_tftp_free_node_info(
const rtems_filesystem_location_info_t *loc
)
{
free (loc->node_access);
}
static bool rtems_tftp_are_nodes_equal(
const rtems_filesystem_location_info_t *a,
const rtems_filesystem_location_info_t *b
)
{
return strcmp (a->node_access, b->node_access) == 0;
}
static const rtems_filesystem_operations_table rtems_tftp_ops = {
.lock_h = rtems_filesystem_default_lock,
.unlock_h = rtems_filesystem_default_unlock,
.eval_path_h = rtems_tftp_eval_path,
.link_h = rtems_filesystem_default_link,
.are_nodes_equal_h = rtems_tftp_are_nodes_equal,
.mknod_h = rtems_filesystem_default_mknod,
.rmnod_h = rtems_filesystem_default_rmnod,
.fchmod_h = rtems_filesystem_default_fchmod,
.chown_h = rtems_filesystem_default_chown,
.clonenod_h = rtems_tftp_clone,
.freenod_h = rtems_tftp_free_node_info,
.mount_h = rtems_filesystem_default_mount,
.unmount_h = rtems_filesystem_default_unmount,
.fsunmount_me_h = rtems_tftpfs_shutdown,
.utime_h = rtems_filesystem_default_utime,
.symlink_h = rtems_filesystem_default_symlink,
.readlink_h = rtems_filesystem_default_readlink,
.rename_h = rtems_filesystem_default_rename,
.statvfs_h = rtems_filesystem_default_statvfs
};
static const rtems_filesystem_file_handlers_r rtems_tftp_handlers = {
.open_h = rtems_tftp_open,
.close_h = rtems_tftp_close,
.read_h = rtems_tftp_read,
.write_h = rtems_tftp_write,
.ioctl_h = rtems_filesystem_default_ioctl,
.lseek_h = rtems_filesystem_default_lseek,
.fstat_h = rtems_tftp_fstat,
.ftruncate_h = rtems_tftp_ftruncate,
.fsync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync,
.fcntl_h = rtems_filesystem_default_fcntl,
.kqfilter_h = rtems_filesystem_default_kqfilter,
.poll_h = rtems_filesystem_default_poll,
.readv_h = rtems_filesystem_default_readv,
.writev_h = rtems_filesystem_default_writev
};
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