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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [lib/] [tftpDriver.c] - Blame information for rev 173

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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
 *
 *  $Id: tftpDriver.c,v 1.2 2001-09-27 12:01:52 chris Exp $
 */
 
#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/rtems_bsdnet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
 
#ifndef set_errno_and_return_minus_one
#define set_errno_and_return_minus_one( _error ) \
  do { errno = (_error); return -1; } while(0)
#endif
 
 
/*
 * Range of UDP ports to try
 */
#define UDP_PORT_BASE   3180
 
/*
 * Pathname prefix
 */
#define TFTP_PATHNAME_PREFIX    "/TFTP/"
 
/*
 * Default limits
 */
#define PACKET_REPLY_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 received
         */
        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;
};
 
/*
 * 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 */
};
 
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 = NULL;
 
  /*
   *  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)
    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_ONLY,
     NULL,
     TFTP_PATHNAME_PREFIX
  );
 
  if ( status )
    perror( "TFTP mount failed" );
 
  return status;
}
 
/*
 * Set error message
 * This RTEMS/UNIX error mapping needs to be fixed!
 */
static void
tftpSetErrno (struct tftpStream *tp)
{
        unsigned int tftpError;
        static const int errorMap[] = {
                0,
                ENOENT,
                EPERM,
                ENOSPC,
                EINVAL,
                ENXIO,
                EEXIST,
                ESRCH,
                0,
        };
 
        tftpError = ntohs (tp->pkbuf.tftpERROR.errorCode);
        if (tftpError < (sizeof errorMap / sizeof errorMap[0]))
                errno = errorMap[tftpError];
        else
                errno = 1000 + tftpError;
}
 
/*
 * Send a message to make the other end shut up
 */
static void
sendStifle (struct tftpStream *tp, struct sockaddr_in *to)
{
        int len;
 
        /*
         * Create the error packet (Unknown transfer ID).
         */
        tp->pkbuf.tftpERROR.opcode = htons (TFTP_OPCODE_ERROR);
        tp->pkbuf.tftpERROR.errorCode = htons (5);
        len = sizeof tp->pkbuf.tftpERROR.opcode +
                                sizeof tp->pkbuf.tftpERROR.errorCode + 1;
        len += sprintf (tp->pkbuf.tftpERROR.errorMessage, "GO AWAY");
 
        /*
         * Send it
         */
        sendto (tp->socket, (char *)&tp->pkbuf, len, 0,
                                        (struct sockaddr *)to, sizeof *to);
}
 
/*
 * Wait for a data packet
 */
static int
getPacket (struct tftpStream *tp)
{
        int len;
        struct timeval tv;
 
        tv.tv_sec = PACKET_REPLY_MILLISECONDS / 1000;
        tv.tv_usec = (PACKET_REPLY_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);
        return len;
}
 
/*
 * Send an acknowledgement
 */
static int
sendAck (struct tftpStream *tp)
{
        /*
         * 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);
}
 
int rtems_tftp_evaluate_for_make(
   const char                         *path,       /* IN     */
   rtems_filesystem_location_info_t   *pathloc,    /* IN/OUT */
   const char                        **name        /* OUT    */
)
{
  set_errno_and_return_minus_one( EIO );
}
 
/*
 * XXX - Fix return values.
 */
 
int rtems_tftp_eval_path(
  const char                        *pathname,     /* IN     */
  int                                flags,        /* IN     */
  rtems_filesystem_location_info_t  *pathloc       /* IN/OUT */
)
{
 
  /*
   * Read-only for now
   */
 
  if ( (flags & O_WRONLY) == O_WRONLY )
    set_errno_and_return_minus_one( ENOENT );
 
  /*
   * The File system is mounted at TFTP_PATHNAME_PREFIX
   * the caller of this routine has striped off this part of the
   * name. Save the remainder of the name for use by the open routine.
   */
 
  pathloc->node_access = (void * ) pathname;
  pathloc->handlers    = &rtems_tftp_handlers;
 
  return 0;
}
 
 
int rtems_tftp_open(
  rtems_libio_t *iop,
  const char    *new_name,
  unsigned32     flag,
  unsigned32     mode
)
{
  struct tftpStream  *tp;
  int                 retryCount;
  rtems_unsigned32    farAddress;
  int                 s;
  int                 len;
  char               *cp1;
  char               *cp2;
  char               *remoteFilename;
  rtems_interval      now;
  rtems_status_code   sc;
  char               *hostname;
 
  /*
   * This came from the evaluate path.
   */
 
  cp2 = iop->file_info;
 
  cp1 = cp2;
  while (*cp2 != '/') {
    if (*cp2 == '\0')
      return ENOENT;
    cp2++;
  }
 
  len = cp2 - cp1;
  hostname = malloc (len + 1);
  if (hostname == NULL)
    return ENOMEM;
 
  strncpy (hostname, cp1, len);
  hostname[len] = '\0';
  farAddress = inet_addr (hostname);
  free (hostname);
 
  if ((farAddress == 0) || (farAddress == ~0))
    return ENOENT;
 
  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.s_addr = farAddress;
  tp->farAddress.sin_port = htons (69);
 
  /*
   * Start the transfer
   */
  tp->firstReply = 1;
  for (;;) {
    /*
     * Create the request
     */
    tp->pkbuf.tftpRWRQ.opcode = htons (TFTP_OPCODE_RRQ);
    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);
    if (len >= (int) sizeof tp->pkbuf.tftpACK) {
      int opcode = ntohs (tp->pkbuf.tftpDATA.opcode);
      if ((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 (opcode == TFTP_OPCODE_ERROR) {
        tftpSetErrno (tp);
        close (tp->socket);
        releaseStream (s);
        return EIO;
      }
    }
 
    /*
     * Keep trying
     */
    if (++retryCount >= OPEN_RETRY_LIMIT) {
      close (tp->socket);
      releaseStream (s);
      return EIO;
    }
  }
 
  return 0;
}
 
/*
 * Read from a TFTP stream
 */
 
int rtems_tftp_read(
  rtems_libio_t *iop,
  void          *buffer,
  unsigned32     count
)
{
  char              *bp;
  struct tftpStream *tp;
  int                retryCount;
  int                nwant;
 
  tp = iop->data1;
 
  /*
   * Read till user request is satisfied or EOF is reached
   */
 
  bp = buffer;
  nwant = count;
  while (nwant) {
    if (tp->nleft) {
      int count;
      if (nwant < tp->nleft)
        count = nwant;
      else
        count = tp->nleft;
      memcpy (bp, &tp->pkbuf.tftpDATA.data[tp->nused], count);
      tp->nused += count;
      tp->nleft -= count;
      bp += count;
      nwant -= count;
      if (nwant == 0)
        break;
    }
    if (tp->eof)
      break;
 
    /*
     * Wait for the next packet
     */
    retryCount = 0;
    for (;;) {
      int len = getPacket (tp);
      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)
            set_errno_and_return_minus_one( EIO );
          break;
        }
        if (opcode == TFTP_OPCODE_ERROR) {
          tftpSetErrno (tp);
          return RTEMS_INTERNAL_ERROR;
        }
      }
 
      /*
       * Keep trying?
       */
      if (++retryCount == IO_RETRY_LIMIT)
        set_errno_and_return_minus_one( EIO );
      if (sendAck (tp) != 0)
        set_errno_and_return_minus_one( EIO );
    }
  }
 
 /*
  * XXX - Eric is this right?
  *
  */
  return count - nwant;
}
 
/*
 * Close a TFTP stream
 */
int rtems_tftp_close(
  rtems_libio_t *iop
)
{
  struct tftpStream *tp = iop->data1;;
 
  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;
}
 
int rtems_tftp_write(
  rtems_libio_t *iop,
  const void    *buffer,
  unsigned32     count
)
{
  return RTEMS_NOT_CONFIGURED;
}
 
rtems_device_driver rtems_tftp_control(
  rtems_device_major_number major,
  rtems_device_minor_number minor,
  void *pargp
)
{
  return RTEMS_NOT_CONFIGURED;
}
 
rtems_filesystem_node_types_t rtems_tftp_node_type(
   rtems_filesystem_location_info_t    *pathloc         /* IN */
)
{
  return RTEMS_FILESYSTEM_MEMORY_FILE;
}
 
 
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 */
  NULL,                            /* 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,
  rtems_tftp_close,
  rtems_tftp_read,
  rtems_tftp_write,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
};

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [lib/] [tftpDriver.c] - Blame information for rev 173

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* Trivial File Transfer Protocol (RFC 1350)`
3			`*`
4			`* Transfer file to/from remote host`
5			`*`
6			`* W. Eric Norum`
7			`* Saskatchewan Accelerator Laboratory`
8			`* University of Saskatchewan`
9			`* Saskatoon, Saskatchewan, CANADA`
10			`* eric@skatter.usask.ca`
11			`*`
12			`* $Id: tftpDriver.c,v 1.2 2001-09-27 12:01:52 chris Exp $`
13			`*/`
14
15			`#include <stdio.h>`
16			`#include <stdlib.h>`
17			`#include <errno.h>`
18			`#include <malloc.h>`
19			`#include <string.h>`
20			`#include <unistd.h>`
21			`#include <fcntl.h>`
22			`#include <rtems.h>`
23			`#include <rtems/libio.h>`
24			`#include <rtems/rtems_bsdnet.h>`
25			`#include <sys/types.h>`
26			`#include <sys/socket.h>`
27			`#include <netinet/in.h>`
28			`#include <arpa/inet.h>`
29
30			`#ifndef set_errno_and_return_minus_one`
31			`#define set_errno_and_return_minus_one( _error ) \`
32			`do { errno = (_error); return -1; } while(0)`
33			`#endif`
34
35
36			`/*`
37			`* Range of UDP ports to try`
38			`*/`
39			`#define UDP_PORT_BASE 3180`
40
41			`/*`
42			`* Pathname prefix`
43			`*/`
44			`#define TFTP_PATHNAME_PREFIX "/TFTP/"`
45
46			`/*`
47			`* Default limits`
48			`*/`
49			`#define PACKET_REPLY_MILLISECONDS 6000`
50			`#define OPEN_RETRY_LIMIT 10`
51			`#define IO_RETRY_LIMIT 10`
52
53			`/*`
54			`* TFTP opcodes`
55			`*/`
56			`#define TFTP_OPCODE_RRQ 1`
57			`#define TFTP_OPCODE_WRQ 2`
58			`#define TFTP_OPCODE_DATA 3`
59			`#define TFTP_OPCODE_ACK 4`
60			`#define TFTP_OPCODE_ERROR 5`
61
62			`/*`
63			`* Largest data transfer`
64			`*/`
65			`#define TFTP_BUFSIZE 512`
66
67			`/*`
68			`* Packets transferred between machines`
69			`*/`
70			`union tftpPacket {`
71			`/*`
72			`* RRQ/WRQ packet`
73			`*/`
74			`struct tftpRWRQ {`
75			`rtems_unsigned16 opcode;`
76			`char filename_mode[TFTP_BUFSIZE];`
77			`} tftpRWRQ;`
78
79			`/*`
80			`* DATA packet`
81			`*/`
82			`struct tftpDATA {`
83			`rtems_unsigned16 opcode;`
84			`rtems_unsigned16 blocknum;`
85			`rtems_unsigned8 data[TFTP_BUFSIZE];`
86			`} tftpDATA;`
87
88			`/*`
89			`* ACK packet`
90			`*/`
91			`struct tftpACK {`
92			`rtems_unsigned16 opcode;`
93			`rtems_unsigned16 blocknum;`
94			`} tftpACK;`
95
96			`/*`
97			`* ERROR packet`
98			`*/`
99			`struct tftpERROR {`
100			`rtems_unsigned16 opcode;`
101			`rtems_unsigned16 errorCode;`
102			`char errorMessage[TFTP_BUFSIZE];`
103			`} tftpERROR;`
104			`};`
105
106			`/*`
107			`* State of each TFTP stream`
108			`*/`
109			`struct tftpStream {`
110			`/*`
111			`* Buffer for storing most recently-received packet`
112			`*/`
113			`union tftpPacket pkbuf;`
114
115			`/*`
116			`* Last block number received`
117			`*/`
118			`rtems_unsigned16 blocknum;`
119
120			`/*`
121			`* Data transfer socket`
122			`*/`
123			`int socket;`
124			`struct sockaddr_in myAddress;`
125			`struct sockaddr_in farAddress;`
126
127			`/*`
128			`* Indices into buffer`
129			`*/`
130			`int nleft;`
131			`int nused;`
132
133			`/*`
134			`* Flags`
135			`*/`
136			`int firstReply;`
137			`int eof;`
138			`};`
139
140			`/*`
141			`* Number of streams open at the same time`
142			`*/`
143
144			`static rtems_id tftp_mutex;`
145			`static int nStreams;`
146			`static struct tftpStream ** volatile tftpStreams;`
147
148			`typedef const char *tftp_node;`
149			`extern rtems_filesystem_operations_table rtems_tftp_ops;`
150			`extern rtems_filesystem_file_handlers_r rtems_tftp_handlers;`
151
152			`/*`
153			`* Direct copy from the IMFS. Look at this.`
154			`*/`
155
156			`rtems_filesystem_limits_and_options_t rtems_tftp_limits_and_options = {`
157			`5, /* link_max */`
158			`6, /* max_canon */`
159			`7, /* max_input */`
160			`255, /* name_max */`
161			`255, /* path_max */`
162			`2, /* pipe_buf */`
163			`1, /* posix_async_io */`
164			`2, /* posix_chown_restrictions */`
165			`3, /* posix_no_trunc */`
166			`4, /* posix_prio_io */`
167			`5, /* posix_sync_io */`
168			`6 /* posix_vdisable */`
169			`};`
170
171			`int rtems_tftp_mount_me(`
172			`rtems_filesystem_mount_table_entry_t *temp_mt_entry`
173			`)`
174			`{`
175			`rtems_status_code sc;`
176
177			`temp_mt_entry->mt_fs_root.handlers = &rtems_tftp_handlers;`
178			`temp_mt_entry->mt_fs_root.ops = &rtems_tftp_ops;`
179
180			`/*`
181			`* We have no tftp filesystem specific data to maintain. This`
182			`* filesystem may only be mounted ONCE.`
183			`*`
184			`* And we maintain no real filesystem nodes, so there is no real root.`
185			`*/`
186
187			`temp_mt_entry->fs_info = NULL;`
188			`temp_mt_entry->mt_fs_root.node_access = NULL;`
189
190			`/*`
191			`* These need to be looked at for full POSIX semantics.`
192			`*/`
193
194			`temp_mt_entry->pathconf_limits_and_options = rtems_tftp_limits_and_options;`
195
196
197			`/*`
198			`* Now allocate a semaphore for mutual exclusion.`
199			`*`
200			`* NOTE: This could be in an fsinfo for this filesystem type.`
201			`*/`
202
203			`sc = rtems_semaphore_create (`
204			`rtems_build_name('T', 'F', 'T', 'P'),`
205			`1,`
206			`RTEMS_FIFO \|`
207			`RTEMS_BINARY_SEMAPHORE \|`
208			`RTEMS_NO_INHERIT_PRIORITY \|`
209			`RTEMS_NO_PRIORITY_CEILING \|`
210			`RTEMS_LOCAL,`
211			`0,`
212			`&tftp_mutex`
213			`);`
214
215			`if (sc != RTEMS_SUCCESSFUL)`
216			`set_errno_and_return_minus_one( ENOMEM );`
217
218			`return 0;`
219			`}`
220
221			`/*`
222			`* Initialize the TFTP driver`
223			`*/`
224
225			`int rtems_bsdnet_initialize_tftp_filesystem ()`
226			`{`
227			`int status;`
228			`rtems_filesystem_mount_table_entry_t *entry;`
229
230			`status = mkdir( TFTP_PATHNAME_PREFIX, S_IRWXU \| S_IRWXG \| S_IRWXO );`
231			`if ( status == -1 )`
232			`return status;`
233
234			`status = mount(`
235			`&entry,`
236			`&rtems_tftp_ops,`
237			`RTEMS_FILESYSTEM_READ_ONLY,`
238			`NULL,`
239			`TFTP_PATHNAME_PREFIX`
240			`);`
241
242			`if ( status )`
243			`perror( "TFTP mount failed" );`
244
245			`return status;`
246			`}`
247
248			`/*`
249			`* Set error message`
250			`* This RTEMS/UNIX error mapping needs to be fixed!`
251			`*/`
252			`static void`
253			`tftpSetErrno (struct tftpStream *tp)`
254			`{`
255			`unsigned int tftpError;`
256			`static const int errorMap[] = {`
257			`0,`
258			`ENOENT,`
259			`EPERM,`
260			`ENOSPC,`
261			`EINVAL,`
262			`ENXIO,`
263			`EEXIST,`
264			`ESRCH,`
265			`0,`
266			`};`
267
268			`tftpError = ntohs (tp->pkbuf.tftpERROR.errorCode);`
269			`if (tftpError < (sizeof errorMap / sizeof errorMap[0]))`
270			`errno = errorMap[tftpError];`
271			`else`
272			`errno = 1000 + tftpError;`
273			`}`
274
275			`/*`
276			`* Send a message to make the other end shut up`
277			`*/`
278			`static void`
279			`sendStifle (struct tftpStream tp, struct sockaddr_in to)`
280			`{`
281			`int len;`
282
283			`/*`
284			`* Create the error packet (Unknown transfer ID).`
285			`*/`
286			`tp->pkbuf.tftpERROR.opcode = htons (TFTP_OPCODE_ERROR);`
287			`tp->pkbuf.tftpERROR.errorCode = htons (5);`
288			`len = sizeof tp->pkbuf.tftpERROR.opcode +`
289			`sizeof tp->pkbuf.tftpERROR.errorCode + 1;`
290			`len += sprintf (tp->pkbuf.tftpERROR.errorMessage, "GO AWAY");`
291
292			`/*`
293			`* Send it`
294			`*/`
295			`sendto (tp->socket, (char *)&tp->pkbuf, len, 0,`
296			`(struct sockaddr )to, sizeof to);`
297			`}`
298
299			`/*`
300			`* Wait for a data packet`
301			`*/`
302			`static int`
303			`getPacket (struct tftpStream *tp)`
304			`{`
305			`int len;`
306			`struct timeval tv;`
307
308			`tv.tv_sec = PACKET_REPLY_MILLISECONDS / 1000;`
309			`tv.tv_usec = (PACKET_REPLY_MILLISECONDS % 1000) * 1000;`
310			`setsockopt (tp->socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv);`
311			`for (;;) {`
312			`union {`
313			`struct sockaddr s;`
314			`struct sockaddr_in i;`
315			`} from;`
316			`int fromlen = sizeof from;`
317			`len = recvfrom (tp->socket, (char *)&tp->pkbuf,`
318			`sizeof tp->pkbuf, 0,`
319			`&from.s, &fromlen);`
320			`if (len < 0)`
321			`break;`
322			`if (from.i.sin_addr.s_addr == tp->farAddress.sin_addr.s_addr) {`
323			`if (tp->firstReply) {`
324			`tp->firstReply = 0;`
325			`tp->farAddress.sin_port = from.i.sin_port;`
326			`}`
327			`if (tp->farAddress.sin_port == from.i.sin_port)`
328			`break;`
329			`}`
330
331			`/*`
332			`* Packet is from someone with whom we are`
333			`* not interested. Tell them to go away.`
334			`*/`
335			`sendStifle (tp, &from.i);`
336			`}`
337			`tv.tv_sec = 0;`
338			`tv.tv_usec = 0;`
339			`setsockopt (tp->socket, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof tv);`
340			`return len;`
341			`}`
342
343			`/*`
344			`* Send an acknowledgement`
345			`*/`
346			`static int`
347			`sendAck (struct tftpStream *tp)`
348			`{`
349			`/*`
350			`* Create the acknowledgement`
351			`*/`
352			`tp->pkbuf.tftpACK.opcode = htons (TFTP_OPCODE_ACK);`
353			`tp->pkbuf.tftpACK.blocknum = htons (tp->blocknum);`
354
355			`/*`
356			`* Send it`
357			`*/`
358			`if (sendto (tp->socket, (char *)&tp->pkbuf, sizeof tp->pkbuf.tftpACK, 0,`
359			`(struct sockaddr *)&tp->farAddress,`
360			`sizeof tp->farAddress) < 0)`
361			`return errno;`
362			`return 0;`
363			`}`
364
365			`/*`
366			`* Release a stream and clear the pointer to it`
367			`*/`
368			`static void`
369			`releaseStream (int s)`
370			`{`
371			`rtems_semaphore_obtain (tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);`
372			`free (tftpStreams[s]);`
373			`tftpStreams[s] = NULL;`
374			`rtems_semaphore_release (tftp_mutex);`
375			`}`
376
377			`int rtems_tftp_evaluate_for_make(`
378			`const char path, / IN */`
379			`rtems_filesystem_location_info_t pathloc, / IN/OUT */`
380			`const char *name / OUT */`
381			`)`
382			`{`
383			`set_errno_and_return_minus_one( EIO );`
384			`}`
385
386			`/*`
387			`* XXX - Fix return values.`
388			`*/`
389
390			`int rtems_tftp_eval_path(`
391			`const char pathname, / IN */`
392			`int flags, /* IN */`
393			`rtems_filesystem_location_info_t pathloc / IN/OUT */`
394			`)`
395			`{`
396
397			`/*`
398			`* Read-only for now`
399			`*/`
400
401			`if ( (flags & O_WRONLY) == O_WRONLY )`
402			`set_errno_and_return_minus_one( ENOENT );`
403
404			`/*`
405			`* The File system is mounted at TFTP_PATHNAME_PREFIX`
406			`* the caller of this routine has striped off this part of the`
407			`* name. Save the remainder of the name for use by the open routine.`
408			`*/`
409
410			`pathloc->node_access = (void * ) pathname;`
411			`pathloc->handlers = &rtems_tftp_handlers;`
412
413			`return 0;`
414			`}`
415
416
417			`int rtems_tftp_open(`
418			`rtems_libio_t *iop,`
419			`const char *new_name,`
420			`unsigned32 flag,`
421			`unsigned32 mode`
422			`)`
423			`{`
424			`struct tftpStream *tp;`
425			`int retryCount;`
426			`rtems_unsigned32 farAddress;`
427			`int s;`
428			`int len;`
429			`char *cp1;`
430			`char *cp2;`
431			`char *remoteFilename;`
432			`rtems_interval now;`
433			`rtems_status_code sc;`
434			`char *hostname;`
435
436			`/*`
437			`* This came from the evaluate path.`
438			`*/`
439
440			`cp2 = iop->file_info;`
441
442			`cp1 = cp2;`
443			`while (*cp2 != '/') {`
444			`if (*cp2 == '\0')`
445			`return ENOENT;`
446			`cp2++;`
447			`}`
448
449			`len = cp2 - cp1;`
450			`hostname = malloc (len + 1);`
451			`if (hostname == NULL)`
452			`return ENOMEM;`
453
454			`strncpy (hostname, cp1, len);`
455			`hostname[len] = '\0';`
456			`farAddress = inet_addr (hostname);`
457			`free (hostname);`
458
459			`if ((farAddress == 0) \|\| (farAddress == ~0))`
460			`return ENOENT;`
461
462			`if (*++cp2 == '\0')`
463			`return ENOENT;`
464
465			`remoteFilename = cp2;`
466			`if (strlen (remoteFilename) > (TFTP_BUFSIZE - 10))`
467			`return ENOENT;`
468
469			`/*`
470			`* Find a free stream`
471			`*/`
472
473			`sc = rtems_semaphore_obtain (tftp_mutex, RTEMS_WAIT, RTEMS_NO_TIMEOUT);`
474			`if (sc != RTEMS_SUCCESSFUL)`
475			`return EBUSY;`
476
477			`for (s = 0 ; s < nStreams ; s++) {`
478			`if (tftpStreams[s] == NULL)`
479			`break;`
480			`}`
481
482			`if (s == nStreams) {`
483			`/*`
484			`* Reallocate stream pointers`
485			`* Guard against the case where realloc() returns NULL.`
486			`*/`
487			`struct tftpStream **np;`
488
489			`np = realloc (tftpStreams, ++nStreams * sizeof *tftpStreams);`
490			`if (np == NULL) {`
491			`rtems_semaphore_release (tftp_mutex);`
492			`return ENOMEM;`
493			`}`
494			`tftpStreams = np;`
495			`}`
496
497			`tp = tftpStreams[s] = malloc (sizeof (struct tftpStream));`
498			`rtems_semaphore_release (tftp_mutex);`
499			`if (tp == NULL)`
500			`return ENOMEM;`
501			`iop->data0 = s;`
502			`iop->data1 = tp;`
503
504			`/*`
505			`* Create the socket`
506			`*/`
507
508			`if ((tp->socket = socket (AF_INET, SOCK_DGRAM, 0)) < 0) {`
509			`releaseStream (s);`
510			`return ENOMEM;`
511			`}`
512
513			`/*`
514			`* Bind the socket to a local address`
515			`*/`
516
517			`retryCount = 0;`
518			`rtems_clock_get (RTEMS_CLOCK_GET_TICKS_SINCE_BOOT, &now);`
519			`for (;;) {`
520			`int try = (now + retryCount) % 10;`
521
522			`tp->myAddress.sin_family = AF_INET;`
523			`tp->myAddress.sin_port = htons (UDP_PORT_BASE + nStreams * try + s);`
524			`tp->myAddress.sin_addr.s_addr = htonl (INADDR_ANY);`
525			`if (bind (tp->socket, (struct sockaddr *)&tp->myAddress, sizeof tp->myAddress) >= 0)`
526			`break;`
527			`if (++retryCount == 10) {`
528			`close (tp->socket);`
529			`releaseStream (s);`
530			`return EBUSY;`
531			`}`
532			`}`
533
534			`/*`
535			`* Set the UDP destination to the TFTP server`
536			`* port on the remote machine.`
537			`*/`
538			`tp->farAddress.sin_family = AF_INET;`
539			`tp->farAddress.sin_addr.s_addr = farAddress;`
540			`tp->farAddress.sin_port = htons (69);`
541
542			`/*`
543			`* Start the transfer`
544			`*/`
545			`tp->firstReply = 1;`
546			`for (;;) {`
547			`/*`
548			`* Create the request`
549			`*/`
550			`tp->pkbuf.tftpRWRQ.opcode = htons (TFTP_OPCODE_RRQ);`
551			`cp1 = (char *) tp->pkbuf.tftpRWRQ.filename_mode;`
552			`cp2 = (char *) remoteFilename;`
553			`while ((cp1++ = cp2++) != '\0')`
554			`continue;`
555			`cp2 = "octet";`
556			`while ((cp1++ = cp2++) != '\0')`
557			`continue;`
558			`len = cp1 - (char *)&tp->pkbuf.tftpRWRQ;`
559
560			`/*`
561			`* Send the request`
562			`*/`
563			`if (sendto (tp->socket, (char *)&tp->pkbuf, len, 0,`
564			`(struct sockaddr *)&tp->farAddress,`
565			`sizeof tp->farAddress) < 0) {`
566			`close (tp->socket);`
567			`releaseStream (s);`
568			`return EIO;`
569			`}`
570
571			`/*`
572			`* Get reply`
573			`*/`
574			`len = getPacket (tp);`
575			`if (len >= (int) sizeof tp->pkbuf.tftpACK) {`
576			`int opcode = ntohs (tp->pkbuf.tftpDATA.opcode);`
577			`if ((opcode == TFTP_OPCODE_DATA)`
578			`&& (ntohs (tp->pkbuf.tftpDATA.blocknum) == 1)) {`
579			`tp->nused = 0;`
580			`tp->blocknum = 1;`
581			`tp->nleft = len - 2 * sizeof (rtems_unsigned16);`
582			`tp->eof = (tp->nleft < TFTP_BUFSIZE);`
583			`if (sendAck (tp) != 0) {`
584			`close (tp->socket);`
585			`releaseStream (s);`
586			`return EIO;`
587			`}`
588			`break;`
589			`}`
590			`if (opcode == TFTP_OPCODE_ERROR) {`
591			`tftpSetErrno (tp);`
592			`close (tp->socket);`
593			`releaseStream (s);`
594			`return EIO;`
595			`}`
596			`}`
597
598			`/*`
599			`* Keep trying`
600			`*/`
601			`if (++retryCount >= OPEN_RETRY_LIMIT) {`
602			`close (tp->socket);`
603			`releaseStream (s);`
604			`return EIO;`
605			`}`
606			`}`
607
608			`return 0;`
609			`}`
610
611			`/*`
612			`* Read from a TFTP stream`
613			`*/`
614
615			`int rtems_tftp_read(`
616			`rtems_libio_t *iop,`
617			`void *buffer,`
618			`unsigned32 count`
619			`)`
620			`{`
621			`char *bp;`
622			`struct tftpStream *tp;`
623			`int retryCount;`
624			`int nwant;`
625
626			`tp = iop->data1;`
627
628			`/*`
629			`* Read till user request is satisfied or EOF is reached`
630			`*/`
631
632			`bp = buffer;`
633			`nwant = count;`
634			`while (nwant) {`
635			`if (tp->nleft) {`
636			`int count;`
637			`if (nwant < tp->nleft)`
638			`count = nwant;`
639			`else`
640			`count = tp->nleft;`
641			`memcpy (bp, &tp->pkbuf.tftpDATA.data[tp->nused], count);`
642			`tp->nused += count;`
643			`tp->nleft -= count;`
644			`bp += count;`
645			`nwant -= count;`
646			`if (nwant == 0)`
647			`break;`
648			`}`
649			`if (tp->eof)`
650			`break;`
651
652			`/*`
653			`* Wait for the next packet`
654			`*/`
655			`retryCount = 0;`
656			`for (;;) {`
657			`int len = getPacket (tp);`
658			`if (len >= (int)sizeof tp->pkbuf.tftpACK) {`
659			`int opcode = ntohs (tp->pkbuf.tftpDATA.opcode);`
660			`rtems_unsigned16 nextBlock = tp->blocknum + 1;`
661			`if ((opcode == TFTP_OPCODE_DATA)`
662			`&& (ntohs (tp->pkbuf.tftpDATA.blocknum) == nextBlock)) {`
663			`tp->nused = 0;`
664			`tp->nleft = len - 2 * sizeof (rtems_unsigned16);`
665			`tp->eof = (tp->nleft < TFTP_BUFSIZE);`
666			`tp->blocknum++;`
667			`if (sendAck (tp) != 0)`
668			`set_errno_and_return_minus_one( EIO );`
669			`break;`
670			`}`
671			`if (opcode == TFTP_OPCODE_ERROR) {`
672			`tftpSetErrno (tp);`
673			`return RTEMS_INTERNAL_ERROR;`
674			`}`
675			`}`
676
677			`/*`
678			`* Keep trying?`
679			`*/`
680			`if (++retryCount == IO_RETRY_LIMIT)`
681			`set_errno_and_return_minus_one( EIO );`
682			`if (sendAck (tp) != 0)`
683			`set_errno_and_return_minus_one( EIO );`
684			`}`
685			`}`
686
687			`/*`
688			`* XXX - Eric is this right?`
689			`*`
690			`*/`
691			`return count - nwant;`
692			`}`
693
694			`/*`
695			`* Close a TFTP stream`
696			`*/`
697			`int rtems_tftp_close(`
698			`rtems_libio_t *iop`
699			`)`
700			`{`
701			`struct tftpStream *tp = iop->data1;;`
702
703			`if (!tp->eof && !tp->firstReply) {`
704			`/*`
705			`* Tell the other end to stop`
706			`*/`
707			`rtems_interval ticksPerSecond;`
708			`sendStifle (tp, &tp->farAddress);`
709			`rtems_clock_get (RTEMS_CLOCK_GET_TICKS_PER_SECOND, &ticksPerSecond);`
710			`rtems_task_wake_after (1 + ticksPerSecond / 10);`
711			`}`
712			`close (tp->socket);`
713			`releaseStream (iop->data0);`
714			`return RTEMS_SUCCESSFUL;`
715			`}`
716
717			`int rtems_tftp_write(`
718			`rtems_libio_t *iop,`
719			`const void *buffer,`
720			`unsigned32 count`
721			`)`
722			`{`
723			`return RTEMS_NOT_CONFIGURED;`
724			`}`
725
726			`rtems_device_driver rtems_tftp_control(`
727			`rtems_device_major_number major,`
728			`rtems_device_minor_number minor,`
729			`void *pargp`
730			`)`
731			`{`
732			`return RTEMS_NOT_CONFIGURED;`
733			`}`
734
735			`rtems_filesystem_node_types_t rtems_tftp_node_type(`
736			`rtems_filesystem_location_info_t pathloc / IN */`
737			`)`
738			`{`
739			`return RTEMS_FILESYSTEM_MEMORY_FILE;`
740			`}`
741
742
743			`rtems_filesystem_operations_table rtems_tftp_ops = {`
744			`rtems_tftp_eval_path, /* eval_path */`
745			`rtems_tftp_evaluate_for_make, /* evaluate_for_make */`
746			`NULL, /* link */`
747			`NULL, /* unlink */`
748			`rtems_tftp_node_type, /* node_type */`
749			`NULL, /* mknod */`
750			`NULL, /* chown */`
751			`NULL, /* freenodinfo */`
752			`NULL, /* mount */`
753			`rtems_tftp_mount_me, /* initialize */`
754			`NULL, /* unmount */`
755			`NULL, /* fsunmount */`
756			`NULL, /* utime, */`
757			`NULL, /* evaluate_link */`
758			`NULL, /* symlink */`
759			`NULL, /* readlin */`
760			`};`
761
762			`rtems_filesystem_file_handlers_r rtems_tftp_handlers = {`
763			`rtems_tftp_open,`
764			`rtems_tftp_close,`
765			`rtems_tftp_read,`
766			`rtems_tftp_write,`
767			`NULL,`
768			`NULL,`
769			`NULL,`
770			`NULL,`
771			`NULL,`
772			`NULL,`
773			`NULL,`
774			`NULL,`
775			`};`