409 lines
9.1 KiB
C
409 lines
9.1 KiB
C
/* $NetBSD: tftp.c,v 1.4 1997/09/17 16:57:07 drochner Exp $ */
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/*
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* Copyright (c) 1996
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* Matthias Drochner. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by Matthias Drochner.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Simple TFTP implementation for libsa.
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* Assumes:
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* - socket descriptor (int) at open_file->f_devdata
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* - server host IP in global servip
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* Restrictions:
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* - read only
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* - lseek only with SEEK_SET or SEEK_CUR
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* - no big time differences between transfers (<tftp timeout)
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <netinet/udp.h>
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#include <netinet/in_systm.h>
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#include <arpa/tftp.h>
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#include <string.h>
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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#include "tftp.h"
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static int tftp_open(const char *path, struct open_file *f);
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static int tftp_close(struct open_file *f);
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static int tftp_read(struct open_file *f, void *buf, size_t size, size_t *resid);
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static int tftp_write(struct open_file *f, void *buf, size_t size, size_t *resid);
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static off_t tftp_seek(struct open_file *f, off_t offset, int where);
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static int tftp_stat(struct open_file *f, struct stat *sb);
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struct fs_ops tftp_fsops = {
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"tftp", tftp_open, tftp_close, tftp_read, tftp_write, tftp_seek, tftp_stat
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};
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extern struct in_addr servip;
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static int tftpport = 2000;
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#define RSPACE 520 /* max data packet, rounded up */
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struct tftp_handle {
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struct iodesc *iodesc;
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int currblock; /* contents of lastdata */
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int islastblock; /* flag */
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int validsize;
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int off;
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char *path; /* saved for re-requests */
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struct {
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u_char header[HEADER_SIZE];
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struct tftphdr t;
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u_char space[RSPACE];
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} lastdata;
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};
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static int tftperrors[8] = {
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0, /* ??? */
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ENOENT,
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EPERM,
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ENOSPC,
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EINVAL, /* ??? */
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EINVAL, /* ??? */
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EEXIST,
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EINVAL /* ??? */
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};
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static ssize_t
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recvtftp(d, pkt, len, tleft)
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register struct iodesc *d;
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register void *pkt;
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register ssize_t len;
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time_t tleft;
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{
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struct tftphdr *t;
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len = readudp(d, pkt, len, tleft);
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if (len < 8)
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return (-1);
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t = (struct tftphdr *) pkt;
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switch (ntohs(t->th_opcode)) {
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case DATA: {
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int got;
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if (htons(t->th_block) != d->xid) {
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/*
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* Expected block?
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*/
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return (-1);
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}
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if (d->xid == 1) {
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/*
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* First data packet from new port.
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*/
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register struct udphdr *uh;
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uh = (struct udphdr *) pkt - 1;
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d->destport = uh->uh_sport;
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} /* else check uh_sport has not changed??? */
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got = len - (t->th_data - (char *) t);
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return got;
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}
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case ERROR:
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if ((unsigned) ntohs(t->th_code) >= 8) {
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printf("illegal tftp error %d\n", ntohs(t->th_code));
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errno = EIO;
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} else {
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#ifdef DEBUG
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printf("tftp-error %d\n", ntohs(t->th_code));
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#endif
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errno = tftperrors[ntohs(t->th_code)];
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}
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return (-1);
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default:
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#ifdef DEBUG
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printf("tftp type %d not handled\n", ntohs(t->th_opcode));
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#endif
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return (-1);
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}
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}
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/* send request, expect first block (or error) */
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static int
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tftp_makereq(h)
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struct tftp_handle *h;
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{
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struct {
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u_char header[HEADER_SIZE];
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struct tftphdr t;
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u_char space[FNAME_SIZE + 6];
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} wbuf;
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char *wtail;
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int l;
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ssize_t res;
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struct tftphdr *t;
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wbuf.t.th_opcode = htons((u_short) RRQ);
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wtail = wbuf.t.th_stuff;
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l = strlen(h->path);
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bcopy(h->path, wtail, l + 1);
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wtail += l + 1;
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bcopy("octet", wtail, 6);
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wtail += 6;
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t = &h->lastdata.t;
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/* h->iodesc->myport = htons(--tftpport); */
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h->iodesc->myport = htons(tftpport + (getsecs() & 0x3ff));
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h->iodesc->destport = htons(IPPORT_TFTP);
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h->iodesc->xid = 1; /* expected block */
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res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
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recvtftp, t, sizeof(*t) + RSPACE);
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if (res == -1)
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return (errno);
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h->currblock = 1;
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h->validsize = res;
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h->islastblock = 0;
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if (res < SEGSIZE)
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h->islastblock = 1; /* very short file */
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return (0);
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}
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/* ack block, expect next */
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static int
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tftp_getnextblock(h)
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struct tftp_handle *h;
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{
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struct {
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u_char header[HEADER_SIZE];
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struct tftphdr t;
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} wbuf;
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char *wtail;
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int res;
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struct tftphdr *t;
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wbuf.t.th_opcode = htons((u_short) ACK);
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wtail = (char *) &wbuf.t.th_block;
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wbuf.t.th_block = htons((u_short) h->currblock);
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wtail += 2;
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t = &h->lastdata.t;
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h->iodesc->xid = h->currblock + 1; /* expected block */
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res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
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recvtftp, t, sizeof(*t) + RSPACE);
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if (res == -1) /* 0 is OK! */
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return (errno);
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h->currblock++;
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h->validsize = res;
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if (res < SEGSIZE)
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h->islastblock = 1; /* EOF */
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return (0);
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}
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static int
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tftp_open(path, f)
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const char *path;
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struct open_file *f;
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{
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struct tftp_handle *tftpfile;
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struct iodesc *io;
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int res;
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tftpfile = (struct tftp_handle *) malloc(sizeof(*tftpfile));
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if (!tftpfile)
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return (ENOMEM);
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tftpfile->iodesc = io = socktodesc(*(int *) (f->f_devdata));
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io->destip = servip;
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tftpfile->off = 0;
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tftpfile->path = strdup(path);
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if (tftpfile->path == NULL) {
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free(tftpfile);
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return(ENOMEM);
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}
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res = tftp_makereq(tftpfile, path);
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if (res) {
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free(tftpfile->path);
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free(tftpfile);
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return (res);
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}
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f->f_fsdata = (void *) tftpfile;
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return (0);
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}
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static int
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tftp_read(f, addr, size, resid)
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struct open_file *f;
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void *addr;
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size_t size;
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size_t *resid; /* out */
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{
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struct tftp_handle *tftpfile;
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static int tc = 0;
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tftpfile = (struct tftp_handle *) f->f_fsdata;
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while (size > 0) {
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int needblock, count;
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if (!(tc++ % 16))
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twiddle();
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needblock = tftpfile->off / SEGSIZE + 1;
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if (tftpfile->currblock > needblock) /* seek backwards */
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tftp_makereq(tftpfile); /* no error check, it worked
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* for open */
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while (tftpfile->currblock < needblock) {
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int res;
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res = tftp_getnextblock(tftpfile);
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if (res) { /* no answer */
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#ifdef DEBUG
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printf("tftp: read error\n");
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#endif
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return (res);
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}
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if (tftpfile->islastblock)
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break;
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}
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if (tftpfile->currblock == needblock) {
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int offinblock, inbuffer;
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offinblock = tftpfile->off % SEGSIZE;
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inbuffer = tftpfile->validsize - offinblock;
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if (inbuffer < 0) {
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#ifdef DEBUG
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printf("tftp: invalid offset %d\n",
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tftpfile->off);
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#endif
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return (EINVAL);
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}
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count = (size < inbuffer ? size : inbuffer);
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bcopy(tftpfile->lastdata.t.th_data + offinblock,
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addr, count);
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addr += count;
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tftpfile->off += count;
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size -= count;
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if ((tftpfile->islastblock) && (count == inbuffer))
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break; /* EOF */
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} else {
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#ifdef DEBUG
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printf("tftp: block %d not found\n", needblock);
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#endif
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return (EINVAL);
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}
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}
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if (resid)
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*resid = size;
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return (0);
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}
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static int
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tftp_close(f)
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struct open_file *f;
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{
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struct tftp_handle *tftpfile;
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tftpfile = (struct tftp_handle *) f->f_fsdata;
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/* let it time out ... */
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if (tftpfile) {
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free(tftpfile->path);
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free(tftpfile);
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}
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return (0);
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}
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static int
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tftp_write(f, start, size, resid)
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struct open_file *f;
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void *start;
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size_t size;
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size_t *resid; /* out */
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{
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return (EROFS);
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}
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static int
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tftp_stat(f, sb)
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struct open_file *f;
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struct stat *sb;
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{
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struct tftp_handle *tftpfile;
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tftpfile = (struct tftp_handle *) f->f_fsdata;
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sb->st_mode = 0444 | S_IFREG;
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sb->st_nlink = 1;
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sb->st_uid = 0;
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sb->st_gid = 0;
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sb->st_size = -1;
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return (0);
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}
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static off_t
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tftp_seek(f, offset, where)
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struct open_file *f;
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off_t offset;
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int where;
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{
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struct tftp_handle *tftpfile;
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tftpfile = (struct tftp_handle *) f->f_fsdata;
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switch (where) {
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case SEEK_SET:
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tftpfile->off = offset;
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break;
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case SEEK_CUR:
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tftpfile->off += offset;
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break;
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default:
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errno = EOFFSET;
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return (-1);
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}
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return (tftpfile->off);
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}
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