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rtems/cpukit/libnetworking/lib/tftpDriver.c
Joel Sherrill cf42e73556 2001-01-16 Eric Norum <eric.norum@usask.ca> 
* lib/tftpDriver.clib/tftpDriver.c: Fix TFTP block number checking.
2002-01-16 22:50:04 +00:00

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/*
* vim: set expandtab tabstop=4 shiftwidth=4 ai :
*
* 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
*
* $Id$
*
*/
#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/libio_.h>
#include <rtems/seterr.h>
#include <rtems/rtems_bsdnet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef RTEMS_TFTP_DRIVER_DEBUG
int rtems_tftp_driver_debug = 1;
#endif
/*
* Range of UDP ports to try
*/
#define UDP_PORT_BASE 3180
/*
* Pathname prefix
*/
#define TFTP_PATHNAME_PREFIX "/TFTP/"
/*
* Root node_access value
* By using the address of a local static variable
* we ensure a unique value for this identifier.
*/
#define ROOT_NODE_ACCESS (&tftp_mutex)
/*
* Default limits
*/
#define PACKET_FIRST_TIMEOUT_MILLISECONDS 400
#define PACKET_TIMEOUT_MILLISECONDS 6000
#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 {
rtems_unsigned16 opcode;
char filename_mode[TFTP_BUFSIZE];
} tftpRWRQ;
/*
* DATA packet
*/
struct tftpDATA {
rtems_unsigned16 opcode;
rtems_unsigned16 blocknum;
rtems_unsigned8 data[TFTP_BUFSIZE];
} tftpDATA;
/*
* ACK packet
*/
struct tftpACK {
rtems_unsigned16 opcode;
rtems_unsigned16 blocknum;
} tftpACK;
/*
* ERROR packet
*/
struct tftpERROR {
rtems_unsigned16 opcode;
rtems_unsigned16 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
*/
rtems_unsigned16 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;
};
/*
* Number of streams open at the same time
*/
static rtems_id tftp_mutex;
static int nStreams;
static struct tftpStream ** volatile tftpStreams;
typedef const char *tftp_node;
extern rtems_filesystem_operations_table rtems_tftp_ops;
extern rtems_filesystem_file_handlers_r rtems_tftp_handlers;
/*
* Direct copy from the IMFS. Look at this.
*/
rtems_filesystem_limits_and_options_t rtems_tftp_limits_and_options = {
5, /* link_max */
6, /* max_canon */
7, /* max_input */
255, /* name_max */
255, /* path_max */
2, /* pipe_buf */
1, /* posix_async_io */
2, /* posix_chown_restrictions */
3, /* posix_no_trunc */
4, /* posix_prio_io */
5, /* posix_sync_io */
6 /* posix_vdisable */
};
static int rtems_tftp_mount_me(
rtems_filesystem_mount_table_entry_t *temp_mt_entry
)
{
rtems_status_code sc;
temp_mt_entry->mt_fs_root.handlers = &rtems_tftp_handlers;
temp_mt_entry->mt_fs_root.ops = &rtems_tftp_ops;
/*
* We have no tftp filesystem specific data to maintain. This
* filesystem may only be mounted ONCE.
*
* And we maintain no real filesystem nodes, so there is no real root.
*/
temp_mt_entry->fs_info = NULL;
temp_mt_entry->mt_fs_root.node_access = ROOT_NODE_ACCESS;
/*
* These need to be looked at for full POSIX semantics.
*/
temp_mt_entry->pathconf_limits_and_options = rtems_tftp_limits_and_options;
/*
* 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,
&tftp_mutex
);
if (sc != RTEMS_SUCCESSFUL)
rtems_set_errno_and_return_minus_one( ENOMEM );
return 0;
}
/*
* Initialize the TFTP driver
*/
int rtems_bsdnet_initialize_tftp_filesystem ()
{
int status;
rtems_filesystem_mount_table_entry_t *entry;
status = mkdir( TFTP_PATHNAME_PREFIX, S_IRWXU | S_IRWXG | S_IRWXO );
if ( status == -1 )
return status;
status = mount(
&entry,
&rtems_tftp_ops,
RTEMS_FILESYSTEM_READ_WRITE,
NULL,
TFTP_PATHNAME_PREFIX
);
if ( status )
perror( "TFTP mount failed" );
return status;
}
/*
* 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 {
rtems_unsigned16 opcode;
rtems_unsigned16 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 / 1000;
tv.tv_usec = (PACKET_FIRST_TIMEOUT_MILLISECONDS % 1000) * 1000;
}
else {
tv.tv_sec = PACKET_TIMEOUT_MILLISECONDS / 1000;
tv.tv_usec = (PACKET_TIMEOUT_MILLISECONDS % 1000) * 1000;
}
setsockopt (tp->socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv);
for (;;) {
union {
struct sockaddr s;
struct sockaddr_in i;
} from;
int fromlen = sizeof from;
len = recvfrom (tp->socket, (char *)&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;
}
/*
* Release a stream and clear the pointer to it
*/
static void
releaseStream (int s)
{
rtems_semaphore_obtain (tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
free (tftpStreams[s]);
tftpStreams[s] = NULL;
rtems_semaphore_release (tftp_mutex);
}
static int rtems_tftp_evaluate_for_make(
const char *path, /* IN */
rtems_filesystem_location_info_t *pathloc, /* IN/OUT */
const char **name /* OUT */
)
{
pathloc->node_access = NULL;
rtems_set_errno_and_return_minus_one( EIO );
}
/*
* 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 int rtems_tftp_eval_path(
const char *pathname, /* IN */
int flags, /* IN */
rtems_filesystem_location_info_t *pathloc /* IN/OUT */
)
{
pathloc->handlers = &rtems_tftp_handlers;
/*
* Hack to provide the illusion of directories inside the TFTP file system.
* Paths ending in a / are assumed to be directories.
*/
if (pathname[strlen(pathname)-1] == '/') {
int isRelative = (pathloc->node_access != ROOT_NODE_ACCESS);
char *cp;
/*
* Reject attempts to open() directories
*/
if (flags & RTEMS_LIBIO_PERMS_RDWR)
rtems_set_errno_and_return_minus_one( EISDIR );
if (isRelative) {
cp = malloc (strlen(pathloc->node_access)+strlen(pathname)+1);
if (cp == NULL)
rtems_set_errno_and_return_minus_one( ENOMEM );
strcpy (cp, pathloc->node_access);
strcat (cp, pathname);
}
else {
cp = strdup (pathname);
if (cp == NULL)
rtems_set_errno_and_return_minus_one( ENOMEM );
}
fixPath (cp);
pathloc->node_access = cp;
return 0;
}
if (pathloc->node_access != ROOT_NODE_ACCESS)
pathloc->node_access = 0;
/*
* Reject it if it's not read-only or write-only.
*/
flags &= RTEMS_LIBIO_PERMS_READ | RTEMS_LIBIO_PERMS_WRITE;
if ((flags != RTEMS_LIBIO_PERMS_READ) && (flags != RTEMS_LIBIO_PERMS_WRITE) )
rtems_set_errno_and_return_minus_one( EINVAL );
return 0;
}
/*
* 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,
unsigned32 flags,
unsigned32 mode
)
{
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;
/*
* Extract the host name component
*/
cp2 = full_path_name;
while (*cp2 == '/')
cp2++;
hostname = cp2;
while (*cp2 != '/') {
if (*cp2 == '\0')
return ENOENT;
cp2++;
}
*cp2++ = '\0';
/*
* Convert hostname to Internet address
*/
if (strcmp (hostname, "BOOTP_HOST") == 0)
farAddress = rtems_bsdnet_bootp_server_address;
else
farAddress.s_addr = inet_addr (hostname);
if ((farAddress.s_addr == 0) || (farAddress.s_addr == ~0))
return ENOENT;
/*
* Extract file pathname component
*/
while (*cp2 == '/')
cp2++;
if (strcmp (cp2, "BOOTP_FILE") == 0) {
cp2 = rtems_bsdnet_bootp_boot_file_name;
while (*cp2 == '/')
cp2++;
}
if (*cp2 == '\0')
return ENOENT;
remoteFilename = cp2;
if (strlen (remoteFilename) > (TFTP_BUFSIZE - 10))
return ENOENT;
/*
* Find a free stream
*/
sc = rtems_semaphore_obtain (tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
if (sc != RTEMS_SUCCESSFUL)
return EBUSY;
for (s = 0 ; s < nStreams ; s++) {
if (tftpStreams[s] == NULL)
break;
}
if (s == nStreams) {
/*
* Reallocate stream pointers
* Guard against the case where realloc() returns NULL.
*/
struct tftpStream **np;
np = realloc (tftpStreams, ++nStreams * sizeof *tftpStreams);
if (np == NULL) {
rtems_semaphore_release (tftp_mutex);
return ENOMEM;
}
tftpStreams = np;
}
tp = tftpStreams[s] = malloc (sizeof (struct tftpStream));
rtems_semaphore_release (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 (s);
return ENOMEM;
}
/*
* Bind the socket to a local address
*/
retryCount = 0;
rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);
for (;;) {
int try = (now + retryCount) % 10;
tp->myAddress.sin_family = AF_INET;
tp->myAddress.sin_port = htons (UDP_PORT_BASE + 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) {
close (tp->socket);
releaseStream (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 ((flags & 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) {
close (tp->socket);
releaseStream (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 (rtems_unsigned16);
tp->eof = (tp->nleft < TFTP_BUFSIZE);
if (sendAck (tp) != 0) {
close (tp->socket);
releaseStream (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);
close (tp->socket);
releaseStream (s);
return e;
}
}
/*
* Keep trying
*/
if (++retryCount >= OPEN_RETRY_LIMIT) {
close (tp->socket);
releaseStream (s);
return EIO;
}
}
return 0;
}
/*
* The IMFS open handler
*/
static int rtems_tftp_open(
rtems_libio_t *iop,
const char *new_name,
unsigned32 flags,
unsigned32 mode
)
{
char *full_path_name;
char *s1;
int err;
/*
* Tack the `current directory' on to relative paths.
* We know that the current directory ends in a / character.
*/
if (*new_name == '/') {
/*
* Skip the TFTP filesystem prefix.
*/
int len = strlen (TFTP_PATHNAME_PREFIX);
if (strncmp (new_name, TFTP_PATHNAME_PREFIX, len))
return ENOENT;
new_name += len;
s1 = "";
}
else {
s1 = rtems_filesystem_current.node_access;
}
full_path_name = malloc (strlen (s1) + strlen (new_name) + 1);
if (full_path_name == NULL)
return ENOMEM;
strcpy (full_path_name, s1);
strcat (full_path_name, new_name);
fixPath (full_path_name);
err = rtems_tftp_open_worker (iop, full_path_name, flags, mode);
free (full_path_name);
return err;
}
/*
* Read from a TFTP stream
*/
static int rtems_tftp_read(
rtems_libio_t *iop,
void *buffer,
unsigned32 count
)
{
char *bp;
struct tftpStream *tp = iop->data1;
int retryCount;
int nwant;
/*
* 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);
rtems_unsigned16 nextBlock = tp->blocknum + 1;
if ((opcode == TFTP_OPCODE_DATA)
&& (ntohs (tp->pkbuf.tftpDATA.blocknum) == nextBlock)) {
tp->nused = 0;
tp->nleft = len - 2 * sizeof (rtems_unsigned16);
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 (rtems_unsigned16);
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
)
{
struct tftpStream *tp = iop->data1;;
if (tp->writing)
rtems_tftp_flush (tp);
if (!tp->eof && !tp->firstReply) {
/*
* Tell the other end to stop
*/
rtems_interval ticksPerSecond;
sendStifle (tp, &tp->farAddress);
rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticksPerSecond);
rtems_task_wake_after (1 + ticksPerSecond / 10);
}
close (tp->socket);
releaseStream (iop->data0);
return RTEMS_SUCCESSFUL;
}
static int rtems_tftp_write(
rtems_libio_t *iop,
const void *buffer,
unsigned32 count
)
{
const char *bp;
struct tftpStream *tp = iop->data1;
int nleft, nfree, ncopy;
/*
* Bail out if an error has occurred
*/
if (!tp->writing)
return 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,
off_t count
)
{
return 0;
}
static rtems_filesystem_node_types_t rtems_tftp_node_type(
rtems_filesystem_location_info_t *pathloc /* IN */
)
{
if ((pathloc->node_access == NULL)
|| (pathloc->node_access == ROOT_NODE_ACCESS))
return RTEMS_FILESYSTEM_MEMORY_FILE;
return RTEMS_FILESYSTEM_DIRECTORY;
}
static int rtems_tftp_free_node_info(
rtems_filesystem_location_info_t *pathloc /* IN */
)
{
if (pathloc->node_access && (pathloc->node_access != ROOT_NODE_ACCESS)) {
free (pathloc->node_access);
pathloc->node_access = NULL;
}
return 0;
}
rtems_filesystem_operations_table rtems_tftp_ops = {
rtems_tftp_eval_path, /* eval_path */
rtems_tftp_evaluate_for_make, /* evaluate_for_make */
NULL, /* link */
NULL, /* unlink */
rtems_tftp_node_type, /* node_type */
NULL, /* mknod */
NULL, /* chown */
rtems_tftp_free_node_info, /* freenodinfo */
NULL, /* mount */
rtems_tftp_mount_me, /* initialize */
NULL, /* unmount */
NULL, /* fsunmount */
NULL, /* utime, */
NULL, /* evaluate_link */
NULL, /* symlink */
NULL, /* readlin */
};
rtems_filesystem_file_handlers_r rtems_tftp_handlers = {
rtems_tftp_open, /* open */
rtems_tftp_close, /* close */
rtems_tftp_read, /* read */
rtems_tftp_write, /* write */
NULL, /* ioctl */
NULL, /* lseek */
NULL, /* fstat */
NULL, /* fchmod */
rtems_tftp_ftruncate, /* ftruncate */
NULL, /* fpathconf */
NULL, /* fsync */
NULL, /* fdatasync */
NULL, /* fcntl */
NULL /* rmnod */
};
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