1999-02-25 23:21:08 +03:00
|
|
|
/* $NetBSD: tftp.c,v 1.2 1999/02/25 20:21:08 ross Exp $ */
|
1999-02-24 22:24:56 +03:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Copyright (c) 1996
|
|
|
|
* Matthias Drochner. All rights reserved.
|
|
|
|
*
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
* modification, are permitted provided that the following conditions
|
|
|
|
* are met:
|
|
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer.
|
|
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
|
|
* documentation and/or other materials provided with the distribution.
|
|
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
|
|
* must display the following acknowledgement:
|
|
|
|
* This product includes software developed for the NetBSD Project
|
|
|
|
* by Matthias Drochner.
|
|
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
|
|
* derived from this software without specific prior written permission.
|
|
|
|
*
|
|
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Simple TFTP implementation for libsa.
|
|
|
|
* Assumes:
|
|
|
|
* - socket descriptor (int) at open_file->f_devdata
|
|
|
|
* - server host IP in global servip
|
|
|
|
* Restrictions:
|
|
|
|
* - read only
|
|
|
|
* - lseek only with SEEK_SET or SEEK_CUR
|
|
|
|
* - no big time differences between transfers (<tftp timeout)
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include <sys/stat.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <netinet/udp.h>
|
|
|
|
#include <netinet/in_systm.h>
|
1999-02-25 23:21:08 +03:00
|
|
|
#include <lib/libkern/libkern.h>
|
1999-02-24 22:24:56 +03:00
|
|
|
#ifdef _STANDALONE
|
|
|
|
#include "/usr/include/arpa/tftp.h" /* XXX */
|
|
|
|
#else
|
|
|
|
#include <arpa/tftp.h>
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#include "stand.h"
|
|
|
|
#include "net.h"
|
|
|
|
#include "netif.h"
|
|
|
|
|
|
|
|
#include "tftp.h"
|
|
|
|
|
|
|
|
extern struct in_addr servip;
|
|
|
|
|
|
|
|
static int tftpport = 2000;
|
|
|
|
|
|
|
|
#define RSPACE 520 /* max data packet, rounded up */
|
|
|
|
|
|
|
|
struct tftp_handle {
|
|
|
|
struct iodesc *iodesc;
|
|
|
|
int currblock; /* contents of lastdata */
|
|
|
|
int islastblock; /* flag */
|
|
|
|
int validsize;
|
|
|
|
int off;
|
|
|
|
char *path; /* saved for re-requests */
|
|
|
|
struct {
|
|
|
|
u_char header[HEADER_SIZE];
|
|
|
|
struct tftphdr t;
|
|
|
|
u_char space[RSPACE];
|
|
|
|
} lastdata;
|
|
|
|
};
|
|
|
|
|
|
|
|
static int tftperrors[8] = {
|
|
|
|
0, /* ??? */
|
|
|
|
ENOENT,
|
|
|
|
EPERM,
|
|
|
|
ENOSPC,
|
|
|
|
EINVAL, /* ??? */
|
|
|
|
EINVAL, /* ??? */
|
|
|
|
EEXIST,
|
|
|
|
EINVAL /* ??? */
|
|
|
|
};
|
|
|
|
|
|
|
|
static ssize_t
|
|
|
|
recvtftp(d, pkt, len, tleft)
|
|
|
|
register struct iodesc *d;
|
|
|
|
register void *pkt;
|
|
|
|
register ssize_t len;
|
|
|
|
time_t tleft;
|
|
|
|
{
|
|
|
|
struct tftphdr *t;
|
|
|
|
|
|
|
|
errno = 0;
|
|
|
|
|
|
|
|
len = readudp(d, pkt, len, tleft);
|
|
|
|
|
|
|
|
if (len < 4)
|
|
|
|
return (-1);
|
|
|
|
|
|
|
|
t = (struct tftphdr *) pkt;
|
|
|
|
switch (ntohs(t->th_opcode)) {
|
|
|
|
case DATA: {
|
|
|
|
int got;
|
|
|
|
|
|
|
|
if (htons(t->th_block) != d->xid) {
|
|
|
|
/*
|
|
|
|
* Expected block?
|
|
|
|
*/
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
if (d->xid == 1) {
|
|
|
|
/*
|
|
|
|
* First data packet from new port.
|
|
|
|
*/
|
|
|
|
register struct udphdr *uh;
|
|
|
|
uh = (struct udphdr *) pkt - 1;
|
|
|
|
d->destport = uh->uh_sport;
|
|
|
|
} /* else check uh_sport has not changed??? */
|
|
|
|
got = len - (t->th_data - (char *) t);
|
|
|
|
return got;
|
|
|
|
}
|
|
|
|
case ERROR:
|
|
|
|
if ((unsigned) ntohs(t->th_code) >= 8) {
|
|
|
|
printf("illegal tftp error %d\n", ntohs(t->th_code));
|
|
|
|
errno = EIO;
|
|
|
|
} else {
|
|
|
|
#ifdef DEBUG
|
|
|
|
printf("tftp-error %d\n", ntohs(t->th_code));
|
|
|
|
#endif
|
|
|
|
errno = tftperrors[ntohs(t->th_code)];
|
|
|
|
}
|
|
|
|
return (-1);
|
|
|
|
default:
|
|
|
|
#ifdef DEBUG
|
|
|
|
printf("tftp type %d not handled\n", ntohs(t->th_opcode));
|
|
|
|
#endif
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* send request, expect first block (or error) */
|
|
|
|
static int
|
|
|
|
tftp_makereq(h)
|
|
|
|
struct tftp_handle *h;
|
|
|
|
{
|
|
|
|
struct {
|
|
|
|
u_char header[HEADER_SIZE];
|
|
|
|
struct tftphdr t;
|
|
|
|
u_char space[FNAME_SIZE + 6];
|
|
|
|
} wbuf;
|
|
|
|
char *wtail;
|
|
|
|
int l;
|
|
|
|
ssize_t res;
|
|
|
|
struct tftphdr *t;
|
|
|
|
|
|
|
|
wbuf.t.th_opcode = htons((u_short) RRQ);
|
|
|
|
wtail = wbuf.t.th_stuff;
|
|
|
|
l = strlen(h->path);
|
|
|
|
bcopy(h->path, wtail, l + 1);
|
|
|
|
wtail += l + 1;
|
|
|
|
bcopy("octet", wtail, 6);
|
|
|
|
wtail += 6;
|
|
|
|
|
|
|
|
t = &h->lastdata.t;
|
|
|
|
|
|
|
|
/* h->iodesc->myport = htons(--tftpport); */
|
|
|
|
h->iodesc->myport = htons(tftpport + (getsecs() & 0x3ff));
|
|
|
|
h->iodesc->destport = htons(IPPORT_TFTP);
|
|
|
|
h->iodesc->xid = 1; /* expected block */
|
|
|
|
|
|
|
|
res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
|
|
|
|
recvtftp, t, sizeof(*t) + RSPACE);
|
|
|
|
|
|
|
|
if (res == -1)
|
|
|
|
return (errno);
|
|
|
|
|
|
|
|
h->currblock = 1;
|
|
|
|
h->validsize = res;
|
|
|
|
h->islastblock = 0;
|
|
|
|
if (res < SEGSIZE)
|
|
|
|
h->islastblock = 1; /* very short file */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* ack block, expect next */
|
|
|
|
static int
|
|
|
|
tftp_getnextblock(h)
|
|
|
|
struct tftp_handle *h;
|
|
|
|
{
|
|
|
|
struct {
|
|
|
|
u_char header[HEADER_SIZE];
|
|
|
|
struct tftphdr t;
|
|
|
|
} wbuf;
|
|
|
|
char *wtail;
|
|
|
|
int res;
|
|
|
|
struct tftphdr *t;
|
|
|
|
|
|
|
|
wbuf.t.th_opcode = htons((u_short) ACK);
|
|
|
|
wbuf.t.th_block = htons((u_short) h->currblock);
|
|
|
|
wtail = (char *) &wbuf.t.th_data;
|
|
|
|
|
|
|
|
t = &h->lastdata.t;
|
|
|
|
|
|
|
|
h->iodesc->xid = h->currblock + 1; /* expected block */
|
|
|
|
|
|
|
|
res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
|
|
|
|
recvtftp, t, sizeof(*t) + RSPACE);
|
|
|
|
|
|
|
|
if (res == -1) /* 0 is OK! */
|
|
|
|
return (errno);
|
|
|
|
|
|
|
|
h->currblock++;
|
|
|
|
h->validsize = res;
|
|
|
|
if (res < SEGSIZE)
|
|
|
|
h->islastblock = 1; /* EOF */
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifndef TFTP_NOTERMINATE
|
|
|
|
static void
|
|
|
|
tftp_terminate(h)
|
|
|
|
struct tftp_handle *h;
|
|
|
|
{
|
|
|
|
struct {
|
|
|
|
u_char header[HEADER_SIZE];
|
|
|
|
struct tftphdr t;
|
|
|
|
} wbuf;
|
|
|
|
char *wtail;
|
|
|
|
|
|
|
|
if (h->islastblock) {
|
|
|
|
wbuf.t.th_opcode = htons((u_short) ACK);
|
|
|
|
wbuf.t.th_block = htons((u_short) h->currblock);
|
|
|
|
} else {
|
|
|
|
wbuf.t.th_opcode = htons((u_short) ERROR);
|
|
|
|
wbuf.t.th_code = htons((u_short) ENOSPACE); /* ??? */
|
|
|
|
}
|
|
|
|
wtail = (char *) &wbuf.t.th_data;
|
|
|
|
|
|
|
|
(void) sendudp(h->iodesc, &wbuf.t, wtail - (char *) &wbuf.t);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
int
|
|
|
|
tftp_open(path, f)
|
|
|
|
char *path;
|
|
|
|
struct open_file *f;
|
|
|
|
{
|
|
|
|
struct tftp_handle *tftpfile;
|
|
|
|
struct iodesc *io;
|
|
|
|
int res;
|
|
|
|
|
|
|
|
tftpfile = (struct tftp_handle *) alloc(sizeof(*tftpfile));
|
|
|
|
if (!tftpfile)
|
|
|
|
return (ENOMEM);
|
|
|
|
|
|
|
|
tftpfile->iodesc = io = socktodesc(*(int *) (f->f_devdata));
|
|
|
|
io->destip = servip;
|
|
|
|
tftpfile->off = 0;
|
|
|
|
tftpfile->path = path; /* XXXXXXX we hope it's static */
|
|
|
|
|
|
|
|
res = tftp_makereq(tftpfile, path);
|
|
|
|
|
|
|
|
if (res) {
|
|
|
|
free(tftpfile, sizeof(*tftpfile));
|
|
|
|
return (res);
|
|
|
|
}
|
|
|
|
f->f_fsdata = (void *) tftpfile;
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
tftp_read(f, addr, size, resid)
|
|
|
|
struct open_file *f;
|
|
|
|
void *addr;
|
|
|
|
size_t size;
|
|
|
|
size_t *resid; /* out */
|
|
|
|
{
|
|
|
|
struct tftp_handle *tftpfile;
|
|
|
|
static int tc = 0;
|
|
|
|
tftpfile = (struct tftp_handle *) f->f_fsdata;
|
|
|
|
|
|
|
|
while (size > 0) {
|
|
|
|
int needblock, count;
|
|
|
|
|
|
|
|
if (!(tc++ % 16))
|
|
|
|
twiddle();
|
|
|
|
|
|
|
|
needblock = tftpfile->off / SEGSIZE + 1;
|
|
|
|
|
|
|
|
if (tftpfile->currblock > needblock) { /* seek backwards */
|
|
|
|
#ifndef TFTP_NOTERMINATE
|
|
|
|
tftp_terminate(tftpfile);
|
|
|
|
#endif
|
|
|
|
tftp_makereq(tftpfile); /* no error check, it worked
|
|
|
|
* for open */
|
|
|
|
}
|
|
|
|
|
|
|
|
while (tftpfile->currblock < needblock) {
|
|
|
|
int res;
|
|
|
|
|
|
|
|
res = tftp_getnextblock(tftpfile);
|
|
|
|
if (res) { /* no answer */
|
|
|
|
#ifdef DEBUG
|
|
|
|
printf("tftp: read error (block %d->%d)\n",
|
|
|
|
tftpfile->currblock, needblock);
|
|
|
|
#endif
|
|
|
|
return (res);
|
|
|
|
}
|
|
|
|
if (tftpfile->islastblock)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (tftpfile->currblock == needblock) {
|
|
|
|
int offinblock, inbuffer;
|
|
|
|
|
|
|
|
offinblock = tftpfile->off % SEGSIZE;
|
|
|
|
|
|
|
|
inbuffer = tftpfile->validsize - offinblock;
|
|
|
|
if (inbuffer < 0) {
|
|
|
|
#ifdef DEBUG
|
|
|
|
printf("tftp: invalid offset %d\n",
|
|
|
|
tftpfile->off);
|
|
|
|
#endif
|
|
|
|
return (EINVAL);
|
|
|
|
}
|
|
|
|
count = (size < inbuffer ? size : inbuffer);
|
|
|
|
bcopy(tftpfile->lastdata.t.th_data + offinblock,
|
|
|
|
addr, count);
|
|
|
|
|
|
|
|
addr += count;
|
|
|
|
tftpfile->off += count;
|
|
|
|
size -= count;
|
|
|
|
|
|
|
|
if ((tftpfile->islastblock) && (count == inbuffer))
|
|
|
|
break; /* EOF */
|
|
|
|
} else {
|
|
|
|
#ifdef DEBUG
|
|
|
|
printf("tftp: block %d not found\n", needblock);
|
|
|
|
#endif
|
|
|
|
return (EINVAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
if (resid)
|
|
|
|
*resid = size;
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
tftp_close(f)
|
|
|
|
struct open_file *f;
|
|
|
|
{
|
|
|
|
struct tftp_handle *tftpfile;
|
|
|
|
tftpfile = (struct tftp_handle *) f->f_fsdata;
|
|
|
|
|
|
|
|
#ifdef TFTP_NOTERMINATE
|
|
|
|
/* let it time out ... */
|
|
|
|
#else
|
|
|
|
tftp_terminate(tftpfile);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
free(tftpfile, sizeof(*tftpfile));
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
tftp_write(f, start, size, resid)
|
|
|
|
struct open_file *f;
|
|
|
|
void *start;
|
|
|
|
size_t size;
|
|
|
|
size_t *resid; /* out */
|
|
|
|
{
|
|
|
|
return (EROFS);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
tftp_stat(f, sb)
|
|
|
|
struct open_file *f;
|
|
|
|
struct stat *sb;
|
|
|
|
{
|
|
|
|
struct tftp_handle *tftpfile;
|
|
|
|
tftpfile = (struct tftp_handle *) f->f_fsdata;
|
|
|
|
|
|
|
|
sb->st_mode = 0444;
|
|
|
|
sb->st_nlink = 1;
|
|
|
|
sb->st_uid = 0;
|
|
|
|
sb->st_gid = 0;
|
|
|
|
sb->st_size = -1;
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
off_t
|
|
|
|
tftp_seek(f, offset, where)
|
|
|
|
struct open_file *f;
|
|
|
|
off_t offset;
|
|
|
|
int where;
|
|
|
|
{
|
|
|
|
struct tftp_handle *tftpfile;
|
|
|
|
tftpfile = (struct tftp_handle *) f->f_fsdata;
|
|
|
|
|
|
|
|
switch (where) {
|
|
|
|
case SEEK_SET:
|
|
|
|
tftpfile->off = offset;
|
|
|
|
break;
|
|
|
|
case SEEK_CUR:
|
|
|
|
tftpfile->off += offset;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
errno = EOFFSET;
|
|
|
|
return (-1);
|
|
|
|
}
|
|
|
|
return (tftpfile->off);
|
|
|
|
}
|