786 lines
18 KiB
C
786 lines
18 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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struct tftp_handle;
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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_parse_oack(struct tftp_handle *h, char *buf, size_t len);
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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_set_blksize(struct tftp_handle *h, const char *str);
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static int tftp_stat(struct open_file *f, struct stat *sb);
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static ssize_t sendrecv_tftp(struct tftp_handle *h,
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ssize_t (*sproc)(struct iodesc *, void *, size_t),
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void *sbuf, size_t ssize,
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ssize_t (*rproc)(struct tftp_handle *h, void **, void **, time_t, unsigned short *),
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void **, void **, unsigned short *rtype);
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struct fs_ops tftp_fsops = {
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"tftp",
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tftp_open,
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tftp_close,
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tftp_read,
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tftp_write,
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tftp_seek,
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tftp_stat,
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null_readdir
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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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static int is_open = 0;
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/*
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* The legacy TFTP_BLKSIZE value was SEGSIZE(512).
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* TFTP_REQUESTED_BLKSIZE of 1428 is (Ethernet MTU, less the TFTP, UDP and
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* IP header lengths).
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*/
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#define TFTP_REQUESTED_BLKSIZE 1428
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/*
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* Choose a blksize big enough so we can test with Ethernet
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* Jumbo frames in the future.
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*/
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#define TFTP_MAX_BLKSIZE 9008
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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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unsigned int tftp_blksize;
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unsigned long tftp_tsize;
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void *pkt;
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struct tftphdr *tftp_hdr;
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};
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#define TFTP_MAX_ERRCODE EOPTNEG
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static const int tftperrors[TFTP_MAX_ERRCODE + 1] = {
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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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EINVAL, /* Option negotiation failed. */
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};
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static int tftp_getnextblock(struct tftp_handle *h);
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/* send error message back. */
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static void
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tftp_senderr(struct tftp_handle *h, u_short errcode, const char *msg)
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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[63]; /* +1 from t */
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} __packed __aligned(4) wbuf;
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char *wtail;
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int len;
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len = strlen(msg);
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if (len > sizeof(wbuf.space))
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len = sizeof(wbuf.space);
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wbuf.t.th_opcode = htons((u_short) ERROR);
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wbuf.t.th_code = htons(errcode);
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wtail = wbuf.t.th_msg;
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bcopy(msg, wtail, len);
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wtail[len] = '\0';
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wtail += len + 1;
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sendudp(h->iodesc, &wbuf.t, wtail - (char *) &wbuf.t);
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}
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static void
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tftp_sendack(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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} __packed __aligned(4) wbuf;
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char *wtail;
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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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sendudp(h->iodesc, &wbuf.t, wtail - (char *) &wbuf.t);
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}
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static ssize_t
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recvtftp(struct tftp_handle *h, void **pkt, void **payload, time_t tleft,
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unsigned short *rtype)
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{
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struct iodesc *d = h->iodesc;
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struct tftphdr *t;
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void *ptr = NULL;
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ssize_t len;
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errno = 0;
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len = readudp(d, &ptr, (void **)&t, tleft);
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if (len < 4) {
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free(ptr);
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return (-1);
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}
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*rtype = ntohs(t->th_opcode);
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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) != (u_short) d->xid) {
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/*
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* Expected block?
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*/
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free(ptr);
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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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struct udphdr *uh;
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uh = (struct udphdr *) t - 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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*pkt = ptr;
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*payload = 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) > TFTP_MAX_ERRCODE) {
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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 TFTP_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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free(ptr);
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return (-1);
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case OACK: {
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struct udphdr *uh;
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int tftp_oack_len;
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/*
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* Unexpected OACK. TFTP transfer already in progress.
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* Drop the pkt.
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*/
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if (d->xid != 1) {
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free(ptr);
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return (-1);
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}
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/*
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* Remember which port this OACK came from, because we need
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* to send the ACK or errors back to it.
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*/
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uh = (struct udphdr *) t - 1;
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d->destport = uh->uh_sport;
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/* Parse options ACK-ed by the server. */
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tftp_oack_len = len - sizeof(t->th_opcode);
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if (tftp_parse_oack(h, t->th_u.tu_stuff, tftp_oack_len) != 0) {
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tftp_senderr(h, EOPTNEG, "Malformed OACK");
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errno = EIO;
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free(ptr);
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return (-1);
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}
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*pkt = ptr;
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*payload = t;
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return (0);
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}
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default:
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#ifdef TFTP_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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free(ptr);
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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(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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} __packed __aligned(4) wbuf;
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char *wtail;
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int l;
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ssize_t res;
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void *pkt;
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struct tftphdr *t;
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char *tftp_blksize = NULL;
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int blksize_l;
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unsigned short rtype = 0;
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/*
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* Allow overriding default TFTP block size by setting
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* a tftp.blksize environment variable.
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*/
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if ((tftp_blksize = getenv("tftp.blksize")) != NULL) {
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tftp_set_blksize(h, tftp_blksize);
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}
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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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#ifdef TFTP_PREPEND_PATH
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if (l > FNAME_SIZE - (sizeof(TFTP_PREPEND_PATH) - 1))
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return (ENAMETOOLONG);
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bcopy(TFTP_PREPEND_PATH, wtail, sizeof(TFTP_PREPEND_PATH) - 1);
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wtail += sizeof(TFTP_PREPEND_PATH) - 1;
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#else
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if (l > FNAME_SIZE)
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return (ENAMETOOLONG);
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#endif
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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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bcopy("blksize", wtail, 8);
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wtail += 8;
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blksize_l = sprintf(wtail, "%d", h->tftp_blksize);
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wtail += blksize_l + 1;
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bcopy("tsize", wtail, 6);
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wtail += 6;
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bcopy("0", wtail, 2);
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wtail += 2;
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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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h->currblock = 0;
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h->islastblock = 0;
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h->validsize = 0;
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pkt = NULL;
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res = sendrecv_tftp(h, &sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
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&recvtftp, &pkt, (void **)&t, &rtype);
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if (res == -1) {
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free(pkt);
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return (errno);
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}
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free(h->pkt);
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h->pkt = pkt;
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h->tftp_hdr = t;
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if (rtype == OACK)
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return (tftp_getnextblock(h));
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/* Server ignored our blksize request, revert to TFTP default. */
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h->tftp_blksize = SEGSIZE;
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switch (rtype) {
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case DATA: {
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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 < h->tftp_blksize) {
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h->islastblock = 1; /* very short file */
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tftp_sendack(h);
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}
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return (0);
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}
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case ERROR:
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default:
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return (errno);
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}
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}
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/* ack block, expect next */
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static int
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tftp_getnextblock(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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} __packed __aligned(4) wbuf;
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char *wtail;
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int res;
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void *pkt;
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struct tftphdr *t;
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unsigned short rtype = 0;
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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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h->iodesc->xid = h->currblock + 1; /* expected block */
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pkt = NULL;
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res = sendrecv_tftp(h, &sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
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&recvtftp, &pkt, (void **)&t, &rtype);
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if (res == -1) { /* 0 is OK! */
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free(pkt);
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return (errno);
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}
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free(h->pkt);
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h->pkt = pkt;
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h->tftp_hdr = t;
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h->currblock++;
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h->validsize = res;
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if (res < h->tftp_blksize)
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h->islastblock = 1; /* EOF */
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if (h->islastblock == 1) {
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/* Send an ACK for the last block */
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wbuf.t.th_block = htons((u_short) h->currblock);
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sendudp(h->iodesc, &wbuf.t, wtail - (char *)&wbuf.t);
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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_open(const char *path, 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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size_t pathsize;
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const char *extraslash;
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if (netproto != NET_TFTP)
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return (EINVAL);
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if (f->f_dev->dv_type != DEVT_NET)
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return (EINVAL);
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if (is_open)
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return (EBUSY);
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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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memset(tftpfile, 0, sizeof(*tftpfile));
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tftpfile->tftp_blksize = TFTP_REQUESTED_BLKSIZE;
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tftpfile->iodesc = io = socktodesc(*(int *) (f->f_devdata));
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if (io == NULL)
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return (EINVAL);
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io->destip = servip;
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tftpfile->off = 0;
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pathsize = (strlen(rootpath) + 1 + strlen(path) + 1) * sizeof(char);
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tftpfile->path = malloc(pathsize);
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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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if (rootpath[strlen(rootpath) - 1] == '/' || path[0] == '/')
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extraslash = "";
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else
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extraslash = "/";
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res = snprintf(tftpfile->path, pathsize, "%s%s%s",
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rootpath, extraslash, path);
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if (res < 0 || res > pathsize) {
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free(tftpfile->path);
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free(tftpfile);
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return(ENOMEM);
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}
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res = tftp_makereq(tftpfile);
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if (res) {
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free(tftpfile->path);
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free(tftpfile->pkt);
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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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is_open = 1;
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return (0);
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}
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static int
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tftp_read(struct open_file *f, void *addr, 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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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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twiddle(32);
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needblock = tftpfile->off / tftpfile->tftp_blksize + 1;
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if (tftpfile->currblock > needblock) { /* seek backwards */
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tftp_senderr(tftpfile, 0, "No error: read aborted");
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tftp_makereq(tftpfile); /* no error check, it worked
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* for open */
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}
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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 TFTP_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 % tftpfile->tftp_blksize;
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inbuffer = tftpfile->validsize - offinblock;
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if (inbuffer < 0) {
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#ifdef TFTP_DEBUG
|
|
printf("tftp: invalid offset %d\n",
|
|
tftpfile->off);
|
|
#endif
|
|
return (EINVAL);
|
|
}
|
|
count = (size < inbuffer ? size : inbuffer);
|
|
bcopy(tftpfile->tftp_hdr->th_data + offinblock,
|
|
addr, count);
|
|
|
|
addr = (char *)addr + count;
|
|
tftpfile->off += count;
|
|
size -= count;
|
|
|
|
if ((tftpfile->islastblock) && (count == inbuffer))
|
|
break; /* EOF */
|
|
} else {
|
|
#ifdef TFTP_DEBUG
|
|
printf("tftp: block %d not found\n", needblock);
|
|
#endif
|
|
return (EINVAL);
|
|
}
|
|
|
|
}
|
|
|
|
if (resid)
|
|
*resid = size;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
tftp_close(struct open_file *f)
|
|
{
|
|
struct tftp_handle *tftpfile;
|
|
tftpfile = (struct tftp_handle *) f->f_fsdata;
|
|
|
|
/* let it time out ... */
|
|
|
|
if (tftpfile) {
|
|
free(tftpfile->path);
|
|
free(tftpfile->pkt);
|
|
free(tftpfile);
|
|
}
|
|
is_open = 0;
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
tftp_write(struct open_file *f __unused, void *start __unused, size_t size __unused,
|
|
size_t *resid __unused /* out */)
|
|
{
|
|
return (EROFS);
|
|
}
|
|
|
|
static int
|
|
tftp_stat(struct open_file *f, struct stat *sb)
|
|
{
|
|
struct tftp_handle *tftpfile;
|
|
tftpfile = (struct tftp_handle *) f->f_fsdata;
|
|
|
|
sb->st_mode = 0444 | S_IFREG;
|
|
sb->st_nlink = 1;
|
|
sb->st_uid = 0;
|
|
sb->st_gid = 0;
|
|
sb->st_size = (off_t) tftpfile->tftp_tsize;
|
|
return (0);
|
|
}
|
|
|
|
static off_t
|
|
tftp_seek(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);
|
|
}
|
|
|
|
static ssize_t
|
|
sendrecv_tftp(struct tftp_handle *h,
|
|
ssize_t (*sproc)(struct iodesc *, void *, size_t),
|
|
void *sbuf, size_t ssize,
|
|
ssize_t (*rproc)(struct tftp_handle *, void **, void **, time_t,
|
|
unsigned short *),
|
|
void **pkt, void **payload, unsigned short *rtype)
|
|
{
|
|
struct iodesc *d = h->iodesc;
|
|
ssize_t cc;
|
|
time_t t, t1, tleft;
|
|
|
|
#ifdef TFTP_DEBUG
|
|
if (debug)
|
|
printf("sendrecv: called\n");
|
|
#endif
|
|
|
|
tleft = MINTMO;
|
|
t = t1 = getsecs();
|
|
for (;;) {
|
|
if ((getsecs() - t) > MAXTMO) {
|
|
errno = ETIMEDOUT;
|
|
return -1;
|
|
}
|
|
|
|
cc = (*sproc)(d, sbuf, ssize);
|
|
if (cc != -1 && cc < ssize)
|
|
panic("sendrecv: short write! (%zd < %zu)",
|
|
cc, ssize);
|
|
|
|
if (cc == -1) {
|
|
/* Error on transmit; wait before retrying */
|
|
while ((getsecs() - t1) < tleft);
|
|
continue;
|
|
}
|
|
|
|
recvnext:
|
|
/* Try to get a packet and process it. */
|
|
cc = (*rproc)(h, pkt, payload, tleft, rtype);
|
|
/* Return on data, EOF or real error. */
|
|
if (cc != -1 || errno != 0)
|
|
return (cc);
|
|
if ((getsecs() - t1) < tleft) {
|
|
goto recvnext;
|
|
}
|
|
|
|
/* Timed out or didn't get the packet we're waiting for */
|
|
tleft += MINTMO;
|
|
if (tleft > (2 * MINTMO)) {
|
|
tleft = (2 * MINTMO);
|
|
}
|
|
t1 = getsecs();
|
|
}
|
|
}
|
|
|
|
static int
|
|
tftp_set_blksize(struct tftp_handle *h, const char *str)
|
|
{
|
|
char *endptr;
|
|
int new_blksize;
|
|
int ret = 0;
|
|
|
|
if (h == NULL || str == NULL)
|
|
return (ret);
|
|
|
|
new_blksize =
|
|
(unsigned int)strtol(str, &endptr, 0);
|
|
|
|
/*
|
|
* Only accept blksize value if it is numeric.
|
|
* RFC2348 specifies that acceptable values are 8-65464.
|
|
* Let's choose a limit less than MAXRSPACE.
|
|
*/
|
|
if (*endptr == '\0' && new_blksize >= 8
|
|
&& new_blksize <= TFTP_MAX_BLKSIZE) {
|
|
h->tftp_blksize = new_blksize;
|
|
ret = 1;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* In RFC2347, the TFTP Option Acknowledgement package (OACK)
|
|
* is used to acknowledge a client's option negotiation request.
|
|
* The format of an OACK packet is:
|
|
* +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+
|
|
* | opc | opt1 | 0 | value1 | 0 | optN | 0 | valueN | 0 |
|
|
* +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+
|
|
*
|
|
* opc
|
|
* The opcode field contains a 6, for Option Acknowledgment.
|
|
*
|
|
* opt1
|
|
* The first option acknowledgment, copied from the original
|
|
* request.
|
|
*
|
|
* value1
|
|
* The acknowledged value associated with the first option. If
|
|
* and how this value may differ from the original request is
|
|
* detailed in the specification for the option.
|
|
*
|
|
* optN, valueN
|
|
* The final option/value acknowledgment pair.
|
|
*/
|
|
static int
|
|
tftp_parse_oack(struct tftp_handle *h, char *buf, size_t len)
|
|
{
|
|
/*
|
|
* We parse the OACK strings into an array
|
|
* of name-value pairs.
|
|
*/
|
|
char *tftp_options[128] = { 0 };
|
|
char *val = buf;
|
|
int i = 0;
|
|
int option_idx = 0;
|
|
int blksize_is_set = 0;
|
|
int tsize = 0;
|
|
|
|
unsigned int orig_blksize;
|
|
|
|
while (option_idx < 128 && i < len) {
|
|
if (buf[i] == '\0') {
|
|
if (&buf[i] > val) {
|
|
tftp_options[option_idx] = val;
|
|
val = &buf[i] + 1;
|
|
++option_idx;
|
|
}
|
|
}
|
|
++i;
|
|
}
|
|
|
|
/* Save the block size we requested for sanity check later. */
|
|
orig_blksize = h->tftp_blksize;
|
|
|
|
/*
|
|
* Parse individual TFTP options.
|
|
* * "blksize" is specified in RFC2348.
|
|
* * "tsize" is specified in RFC2349.
|
|
*/
|
|
for (i = 0; i < option_idx; i += 2) {
|
|
if (strcasecmp(tftp_options[i], "blksize") == 0) {
|
|
if (i + 1 < option_idx)
|
|
blksize_is_set =
|
|
tftp_set_blksize(h, tftp_options[i + 1]);
|
|
} else if (strcasecmp(tftp_options[i], "tsize") == 0) {
|
|
if (i + 1 < option_idx)
|
|
tsize = strtol(tftp_options[i + 1], (char **)NULL, 10);
|
|
if (tsize != 0)
|
|
h->tftp_tsize = tsize;
|
|
} else {
|
|
/* Do not allow any options we did not expect to be ACKed. */
|
|
printf("unexpected tftp option '%s'\n", tftp_options[i]);
|
|
return (-1);
|
|
}
|
|
}
|
|
|
|
if (!blksize_is_set) {
|
|
/*
|
|
* If TFTP blksize was not set, try defaulting
|
|
* to the legacy TFTP blksize of SEGSIZE(512)
|
|
*/
|
|
h->tftp_blksize = SEGSIZE;
|
|
} else if (h->tftp_blksize > orig_blksize) {
|
|
/*
|
|
* Server should not be proposing block sizes that
|
|
* exceed what we said we can handle.
|
|
*/
|
|
printf("unexpected blksize %u\n", h->tftp_blksize);
|
|
return (-1);
|
|
}
|
|
|
|
#ifdef TFTP_DEBUG
|
|
printf("tftp_blksize: %u\n", h->tftp_blksize);
|
|
printf("tftp_tsize: %lu\n", h->tftp_tsize);
|
|
#endif
|
|
return 0;
|
|
}
|