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 $
34 * $DragonFly: src/lib/libstand/tftp.c,v 1.5 2005/12/11 02:27:26 swildner Exp $
38 * Simple TFTP implementation for libsa.
40 * - socket descriptor (int) at open_file->f_devdata
41 * - server host IP in global servip
44 * - lseek only with SEEK_SET or SEEK_CUR
45 * - no big time differences between transfers (<tftp timeout)
48 #include <sys/param.h>
50 #include <netinet/in.h>
51 #include <netinet/udp.h>
52 #include <netinet/ip.h>
53 #include <netinet/in_systm.h>
54 #include <arpa/tftp.h>
64 static int tftp_open(const char *path, struct open_file *f);
65 static int tftp_close(struct open_file *f);
66 static int tftp_read(struct open_file *f, void *buf, size_t size, size_t *resid);
67 static int tftp_write(struct open_file *f, void *buf, size_t size, size_t *resid);
68 static off_t tftp_seek(struct open_file *f, off_t offset, int where);
69 static int tftp_stat(struct open_file *f, struct stat *sb);
71 struct fs_ops tftp_fsops = {
82 extern struct in_addr servip;
84 static int tftpport = 2000;
86 #define RSPACE 520 /* max data packet, rounded up */
89 struct iodesc *iodesc;
90 int currblock; /* contents of lastdata */
91 int islastblock; /* flag */
94 char *path; /* saved for re-requests */
96 u_char header[HEADER_SIZE];
99 } __packed __aligned(4) lastdata;
102 static int tftperrors[8] = {
114 recvtftp(struct iodesc *d, void *pkt, size_t max_len, time_t tleft)
121 * Note: errno of 0 with -1 return means udp poll failed or
122 * packet was not for us.
124 * We may end up broadcasting the initial TFTP request. Take the
125 * first DATA result and save any ERROR result in case we do not
132 while ((tmp_len = readudp(d, pkt, max_len, tleft)) > 0) {
134 t = (struct tftphdr *)pkt;
135 if (ntohs(t->th_opcode) == DATA)
139 len = readudp(d, pkt, max_len, tleft);
141 if ((int)len < (int)sizeof(*t))
143 t = (struct tftphdr *)pkt;
146 switch (ntohs(t->th_opcode)) {
150 if (htons(t->th_block) != d->xid) {
158 * First data packet from new port. Set destip in
159 * case we got replies from multiple hosts, so only
160 * one host is selected.
165 uh = (struct udphdr *) pkt - 1;
166 ip = (struct ip *)uh - 1;
167 d->destport = uh->uh_sport;
168 d->destip = ip->ip_src;
169 } /* else check uh_sport has not changed??? */
170 got = len - (t->th_data - (char *)t);
174 if ((unsigned) ntohs(t->th_code) >= 8) {
175 printf("illegal tftp error %d\n", ntohs(t->th_code));
179 printf("tftp-error %d\n", ntohs(t->th_code));
181 errno = tftperrors[ntohs(t->th_code)];
186 printf("tftp type %d not handled\n", ntohs(t->th_opcode));
192 /* send request, expect first block (or error) */
194 tftp_makereq(struct tftp_handle *h)
197 u_char header[HEADER_SIZE];
199 u_char space[FNAME_SIZE + 6];
200 } __packed __aligned(4) wbuf;
206 wbuf.t.th_opcode = htons((u_short) RRQ);
207 wtail = wbuf.t.th_stuff;
209 bcopy(h->path, wtail, l + 1);
211 bcopy("octet", wtail, 6);
216 /* h->iodesc->myport = htons(--tftpport); */
217 h->iodesc->myport = htons(tftpport + (getsecs() & 0x3ff));
218 h->iodesc->destport = htons(IPPORT_TFTP);
219 h->iodesc->xid = 1; /* expected block */
221 res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
222 recvtftp, t, sizeof(*t) + RSPACE);
231 h->islastblock = 1; /* very short file */
235 /* ack block, expect next */
237 tftp_getnextblock(struct tftp_handle *h)
240 u_char header[HEADER_SIZE];
242 } __packed __aligned(4) wbuf;
250 wbuf.t.th_opcode = htons((u_short) ACK);
251 wtail = (char *) &wbuf.t.th_block;
252 wbuf.t.th_block = htons((u_short) h->currblock);
257 h->iodesc->xid = h->currblock + 1; /* expected block */
259 res = sendrecv(h->iodesc, sendudp, &wbuf.t, wtail - (char *) &wbuf.t,
260 recvtftp, t, sizeof(*t) + RSPACE);
262 if (res == -1) /* 0 is OK! */
268 h->islastblock = 1; /* EOF */
273 tftp_open(const char *path, struct open_file *f)
275 struct tftp_handle *tftpfile;
279 tftpfile = (struct tftp_handle *) malloc(sizeof(*tftpfile));
283 tftpfile->iodesc = io = socktodesc(*(int *) (f->f_devdata));
289 tftpfile->path = strdup(path);
290 if (tftpfile->path == NULL) {
295 res = tftp_makereq(tftpfile);
298 free(tftpfile->path);
302 f->f_fsdata = (void *) tftpfile;
311 tftp_read(struct open_file *f, void *addr, size_t size, size_t *resid)
313 struct tftp_handle *tftpfile;
315 tftpfile = (struct tftp_handle *) f->f_fsdata;
318 int needblock, count;
323 needblock = tftpfile->off / SEGSIZE + 1;
325 if (tftpfile->currblock > needblock) /* seek backwards */
326 tftp_makereq(tftpfile); /* no error check, it worked
329 while (tftpfile->currblock < needblock) {
332 res = tftp_getnextblock(tftpfile);
333 if (res) { /* no answer */
335 printf("tftp: read error\n");
339 if (tftpfile->islastblock)
343 if (tftpfile->currblock == needblock) {
344 int offinblock, inbuffer;
346 offinblock = tftpfile->off % SEGSIZE;
348 inbuffer = tftpfile->validsize - offinblock;
351 printf("tftp: invalid offset %d\n",
356 count = (size < inbuffer ? size : inbuffer);
357 bcopy(tftpfile->lastdata.t.th_data + offinblock,
360 addr = (char *)addr + count;
361 tftpfile->off += count;
364 if ((tftpfile->islastblock) && (count == inbuffer))
368 printf("tftp: block %d not found\n", needblock);
381 tftp_close(struct open_file *f)
383 struct tftp_handle *tftpfile;
384 tftpfile = (struct tftp_handle *) f->f_fsdata;
386 /* let it time out ... */
389 free(tftpfile->path);
401 tftp_write(struct open_file *f, void *start, size_t size, size_t *resid)
407 tftp_stat(struct open_file *f, struct stat *sb)
409 struct tftp_handle *tftpfile;
410 tftpfile = (struct tftp_handle *) f->f_fsdata;
412 sb->st_mode = 0444 | S_IFREG;
421 tftp_seek(struct open_file *f, off_t offset, int where)
423 struct tftp_handle *tftpfile;
424 tftpfile = (struct tftp_handle *) f->f_fsdata;
428 tftpfile->off = offset;
431 tftpfile->off += offset;
437 return (tftpfile->off);