1 /* $NetBSD: tftp.c,v 1.4 1997/09/17 16:57:07 drochner Exp $ */
5 * Matthias Drochner. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed for the NetBSD Project
18 * by Matthias Drochner.
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $FreeBSD: src/lib/libstand/tftp.c,v 1.2.6.4 2001/07/14 14:00:03 mikeh Exp $
37 * Simple TFTP implementation for libsa.
39 * - socket descriptor (int) at open_file->f_devdata
40 * - server host IP in global servip
43 * - lseek only with SEEK_SET or SEEK_CUR
44 * - no big time differences between transfers (<tftp timeout)
47 #include <sys/types.h>
49 #include <netinet/in.h>
50 #include <netinet/udp.h>
51 #include <netinet/in_systm.h>
52 #include <arpa/tftp.h>
62 static int tftp_open(const char *path, struct open_file *f);
63 static int tftp_close(struct open_file *f);
64 static int tftp_read(struct open_file *f, void *buf, size_t size, size_t *resid);
65 static int tftp_write(struct open_file *f, void *buf, size_t size, size_t *resid);
66 static off_t tftp_seek(struct open_file *f, off_t offset, int where);
67 static int tftp_stat(struct open_file *f, struct stat *sb);
69 struct fs_ops tftp_fsops = {
80 extern struct in_addr servip;
82 static int tftpport = 2000;
84 #define RSPACE 520 /* max data packet, rounded up */
87 struct iodesc *iodesc;
88 int currblock; /* contents of lastdata */
89 int islastblock; /* flag */
92 char *path; /* saved for re-requests */
94 u_char header[HEADER_SIZE];
100 static int tftperrors[8] = {
112 recvtftp(d, pkt, len, tleft)
113 register struct iodesc *d;
115 register ssize_t len;
122 len = readudp(d, pkt, len, tleft);
127 t = (struct tftphdr *) pkt;
128 switch (ntohs(t->th_opcode)) {
132 if (htons(t->th_block) != d->xid) {
140 * First data packet from new port.
142 register struct udphdr *uh;
143 uh = (struct udphdr *) pkt - 1;
144 d->destport = uh->uh_sport;
145 } /* else check uh_sport has not changed??? */
146 got = len - (t->th_data - (char *) t);
150 if ((unsigned) ntohs(t->th_code) >= 8) {
151 printf("illegal tftp error %d\n", ntohs(t->th_code));
155 printf("tftp-error %d\n", ntohs(t->th_code));
157 errno = tftperrors[ntohs(t->th_code)];
162 printf("tftp type %d not handled\n", ntohs(t->th_opcode));
168 /* send request, expect first block (or error) */
171 struct tftp_handle *h;
174 u_char header[HEADER_SIZE];
176 u_char space[FNAME_SIZE + 6];
183 wbuf.t.th_opcode = htons((u_short) RRQ);
184 wtail = wbuf.t.th_stuff;
186 bcopy(h->path, wtail, l + 1);
188 bcopy("octet", wtail, 6);
193 /* h->iodesc->myport = htons(--tftpport); */
194 h->iodesc->myport = htons(tftpport + (getsecs() & 0x3ff));
195 h->iodesc->destport = htons(IPPORT_TFTP);
196 h->iodesc->xid = 1; /* expected block */
198 res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
199 recvtftp, t, sizeof(*t) + RSPACE);
208 h->islastblock = 1; /* very short file */
212 /* ack block, expect next */
215 struct tftp_handle *h;
218 u_char header[HEADER_SIZE];
225 wbuf.t.th_opcode = htons((u_short) ACK);
226 wtail = (char *) &wbuf.t.th_block;
227 wbuf.t.th_block = htons((u_short) h->currblock);
232 h->iodesc->xid = h->currblock + 1; /* expected block */
234 res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
235 recvtftp, t, sizeof(*t) + RSPACE);
237 if (res == -1) /* 0 is OK! */
243 h->islastblock = 1; /* EOF */
252 struct tftp_handle *tftpfile;
256 tftpfile = (struct tftp_handle *) malloc(sizeof(*tftpfile));
260 tftpfile->iodesc = io = socktodesc(*(int *) (f->f_devdata));
266 tftpfile->path = strdup(path);
267 if (tftpfile->path == NULL) {
272 res = tftp_makereq(tftpfile, path);
275 free(tftpfile->path);
279 f->f_fsdata = (void *) tftpfile;
284 tftp_read(f, addr, size, resid)
288 size_t *resid; /* out */
290 struct tftp_handle *tftpfile;
292 tftpfile = (struct tftp_handle *) f->f_fsdata;
295 int needblock, count;
300 needblock = tftpfile->off / SEGSIZE + 1;
302 if (tftpfile->currblock > needblock) /* seek backwards */
303 tftp_makereq(tftpfile); /* no error check, it worked
306 while (tftpfile->currblock < needblock) {
309 res = tftp_getnextblock(tftpfile);
310 if (res) { /* no answer */
312 printf("tftp: read error\n");
316 if (tftpfile->islastblock)
320 if (tftpfile->currblock == needblock) {
321 int offinblock, inbuffer;
323 offinblock = tftpfile->off % SEGSIZE;
325 inbuffer = tftpfile->validsize - offinblock;
328 printf("tftp: invalid offset %d\n",
333 count = (size < inbuffer ? size : inbuffer);
334 bcopy(tftpfile->lastdata.t.th_data + offinblock,
338 tftpfile->off += count;
341 if ((tftpfile->islastblock) && (count == inbuffer))
345 printf("tftp: block %d not found\n", needblock);
361 struct tftp_handle *tftpfile;
362 tftpfile = (struct tftp_handle *) f->f_fsdata;
364 /* let it time out ... */
367 free(tftpfile->path);
374 tftp_write(f, start, size, resid)
378 size_t *resid; /* out */
388 struct tftp_handle *tftpfile;
389 tftpfile = (struct tftp_handle *) f->f_fsdata;
391 sb->st_mode = 0444 | S_IFREG;
400 tftp_seek(f, offset, where)
405 struct tftp_handle *tftpfile;
406 tftpfile = (struct tftp_handle *) f->f_fsdata;
410 tftpfile->off = offset;
413 tftpfile->off += offset;
419 return (tftpfile->off);