1 /* vi: set sw=4 ts=4: */
3 * A simple tftp client/server for busybox.
4 * Tries to follow RFC1350.
5 * Only "octet" mode supported.
6 * Optional blocksize negotiation (RFC2347 + RFC2348)
8 * Copyright (C) 2001 Magnus Damm <damm@opensource.se>
10 * Parts of the code based on:
12 * atftp: Copyright (C) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca>
13 * and Remi Lefebvre <remi@debian.org>
15 * utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de>
17 * tftpd added by Denys Vlasenko & Vladimir Dronnikov
19 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
23 #if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
25 #define TFTP_BLKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
26 #define TFTP_BLKSIZE_DEFAULT_STR "512"
27 /* Was 50 ms but users asked to bump it up a bit */
28 #define TFTP_TIMEOUT_MS 100
29 #define TFTP_MAXTIMEOUT_MS 2000
30 #define TFTP_NUM_RETRIES 12 /* number of backed-off retries */
32 /* opcodes we support */
40 /* error codes sent over network (we use only 0, 1, 3 and 8) */
41 /* generic (error message is included in the packet) */
45 /* disk full or allocation exceeded */
50 #define ERR_BAD_USER 7
53 /* masks coming from getopt32 */
55 TFTP_OPT_GET = (1 << 0),
56 TFTP_OPT_PUT = (1 << 1),
57 /* pseudo option: if set, it's tftpd */
58 TFTPD_OPT = (1 << 7) * ENABLE_TFTPD,
59 TFTPD_OPT_r = (1 << 8) * ENABLE_TFTPD,
60 TFTPD_OPT_c = (1 << 9) * ENABLE_TFTPD,
61 TFTPD_OPT_u = (1 << 10) * ENABLE_TFTPD,
64 #if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
65 #define IF_GETPUT(...)
66 #define CMD_GET(cmd) 1
67 #define CMD_PUT(cmd) 0
68 #elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
69 #define IF_GETPUT(...)
70 #define CMD_GET(cmd) 0
71 #define CMD_PUT(cmd) 1
73 #define IF_GETPUT(...) __VA_ARGS__
74 #define CMD_GET(cmd) ((cmd) & TFTP_OPT_GET)
75 #define CMD_PUT(cmd) ((cmd) & TFTP_OPT_PUT)
77 /* NB: in the code below
78 * CMD_GET(cmd) and CMD_PUT(cmd) are mutually exclusive
83 /* u16 TFTP_ERROR; u16 reason; both network-endian, then error text: */
84 uint8_t error_pkt[4 + 32];
86 /* used in tftpd_main(), a bit big for stack: */
87 char block_buf[TFTP_BLKSIZE_DEFAULT];
88 #if ENABLE_FEATURE_TFTP_PROGRESS_BAR
95 #define G (*(struct globals*)&bb_common_bufsiz1)
96 struct BUG_G_too_big {
97 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
99 #define block_buf (G.block_buf )
100 #define user_opt (G.user_opt )
101 #define error_pkt (G.error_pkt )
102 #define INIT_G() do { } while (0)
104 #define error_pkt_reason (error_pkt[3])
105 #define error_pkt_str (error_pkt + 4)
107 #if ENABLE_FEATURE_TFTP_PROGRESS_BAR
108 /* SIGALRM logic nicked from the wget applet */
109 static void progress_meter(int flag)
111 /* We can be called from signal handler */
112 int save_errno = errno;
114 if (flag == -1) { /* first call to progress_meter */
115 bb_progress_init(&G.pmt);
118 bb_progress_update(&G.pmt, G.file, 0, G.pos, G.size);
121 /* last call to progress_meter */
123 bb_putchar_stderr('\n');
125 if (flag == -1) { /* first call to progress_meter */
126 signal_SA_RESTART_empty_mask(SIGALRM, progress_meter);
133 static void tftp_progress_init(void)
137 static void tftp_progress_done(void)
143 # define tftp_progress_init() ((void)0)
144 # define tftp_progress_done() ((void)0)
147 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
149 static int tftp_blksize_check(const char *blksize_str, int maxsize)
151 /* Check if the blksize is valid:
152 * RFC2348 says between 8 and 65464,
153 * but our implementation makes it impossible
154 * to use blksizes smaller than 22 octets. */
155 unsigned blksize = bb_strtou(blksize_str, NULL, 10);
157 || (blksize < 24) || (blksize > maxsize)
159 bb_error_msg("bad blocksize '%s'", blksize_str);
162 # if ENABLE_TFTP_DEBUG
163 bb_error_msg("using blksize %u", blksize);
168 static char *tftp_get_option(const char *option, char *buf, int len)
175 * "opt_name<NUL>opt_val<NUL>opt_name2<NUL>opt_val2<NUL>..." */
178 /* Make sure options are terminated correctly */
179 for (k = 0; k < len; k++) {
180 if (buf[k] == '\0') {
186 if (opt_val == 0) { /* it's "name" part */
187 if (strcasecmp(buf, option) == 0) {
190 } else if (opt_found) {
205 static int tftp_protocol(
206 /* NULL if tftp, !NULL if tftpd: */
207 len_and_sockaddr *our_lsa,
208 len_and_sockaddr *peer_lsa,
209 const char *local_file
210 IF_TFTP(, const char *remote_file)
212 # define remote_file NULL
214 /* 1 for tftp; 1/0 for tftpd depending whether client asked about it: */
215 IF_FEATURE_TFTP_BLOCKSIZE(, int want_transfer_size)
216 IF_FEATURE_TFTP_BLOCKSIZE(, int blksize))
218 #if !ENABLE_FEATURE_TFTP_BLOCKSIZE
219 enum { blksize = TFTP_BLKSIZE_DEFAULT };
222 struct pollfd pfd[1];
223 #define socket_fd (pfd[0].fd)
226 IF_FEATURE_TFTP_BLOCKSIZE(smallint expect_OACK = 0;)
227 smallint finished = 0;
231 int open_mode, local_fd;
232 int retries, waittime_ms;
233 int io_bufsize = blksize + 4;
235 /* Can't use RESERVE_CONFIG_BUFFER here since the allocation
236 * size varies meaning BUFFERS_GO_ON_STACK would fail.
238 * We must keep the transmit and receive buffers separate
239 * in case we rcv a garbage pkt - we need to rexmit the last pkt.
241 char *xbuf = xmalloc(io_bufsize);
242 char *rbuf = xmalloc(io_bufsize);
244 socket_fd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0);
245 setsockopt_reuseaddr(socket_fd);
247 if (!ENABLE_TFTP || our_lsa) { /* tftpd */
248 /* Create a socket which is:
249 * 1. bound to IP:port peer sent 1st datagram to,
250 * 2. connected to peer's IP:port
251 * This way we will answer from the IP:port peer
252 * expects, will not get any other packets on
253 * the socket, and also plain read/write will work. */
254 xbind(socket_fd, &our_lsa->u.sa, our_lsa->len);
255 xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
257 /* Is there an error already? Send pkt and bail out */
258 if (error_pkt_reason || error_pkt_str[0])
262 struct passwd *pw = xgetpwnam(user_opt);
263 change_identity(pw); /* initgroups, setgid, setuid */
267 /* Prepare open mode */
268 if (CMD_PUT(option_mask32)) {
269 open_mode = O_RDONLY;
271 open_mode = O_WRONLY | O_TRUNC | O_CREAT;
273 if ((option_mask32 & (TFTPD_OPT+TFTPD_OPT_c)) == TFTPD_OPT) {
274 /* tftpd without -c */
275 open_mode = O_WRONLY | O_TRUNC;
280 /* Examples of network traffic.
281 * Note two cases when ACKs with block# of 0 are sent.
283 * Download without options:
284 * tftp -> "\0\1FILENAME\0octet\0"
285 * "\0\3\0\1FILEDATA..." <- tftpd
288 * Download with option of blksize 16384:
289 * tftp -> "\0\1FILENAME\0octet\0blksize\00016384\0"
290 * "\0\6blksize\00016384\0" <- tftpd
292 * "\0\3\0\1FILEDATA..." <- tftpd
295 * Upload without options:
296 * tftp -> "\0\2FILENAME\0octet\0"
297 * "\0\4\0\0" <- tftpd
298 * tftp -> "\0\3\0\1FILEDATA..."
299 * "\0\4\0\1" <- tftpd
301 * Upload with option of blksize 16384:
302 * tftp -> "\0\2FILENAME\0octet\0blksize\00016384\0"
303 * "\0\6blksize\00016384\0" <- tftpd
304 * tftp -> "\0\3\0\1FILEDATA..."
305 * "\0\4\0\1" <- tftpd
311 if (!ENABLE_TFTP || our_lsa) { /* tftpd */
312 /* Open file (must be after changing user) */
313 local_fd = open(local_file, open_mode, 0666);
315 error_pkt_reason = ERR_NOFILE;
316 strcpy((char*)error_pkt_str, "can't open file");
319 /* gcc 4.3.1 would NOT optimize it out as it should! */
320 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
321 if (blksize != TFTP_BLKSIZE_DEFAULT || want_transfer_size) {
322 /* Create and send OACK packet. */
323 /* For the download case, block_nr is still 1 -
324 * we expect 1st ACK from peer to be for (block_nr-1),
325 * that is, for "block 0" which is our OACK pkt */
327 goto add_blksize_opt;
330 if (CMD_GET(option_mask32)) {
331 /* It's upload and we don't send OACK.
332 * We must ACK 1st packet (with filename)
333 * as if it is "block 0" */
338 /* Open file (must be after changing user) */
339 local_fd = CMD_GET(option_mask32) ? STDOUT_FILENO : STDIN_FILENO;
340 if (NOT_LONE_DASH(local_file))
341 local_fd = xopen(local_file, open_mode);
342 /* Removing #if, or using if() statement instead of #if may lead to
343 * "warning: null argument where non-null required": */
347 /* We can't (and don't really need to) bind the socket:
348 * we don't know from which local IP datagrams will be sent,
349 * but kernel will pick the same IP every time (unless routing
350 * table is changed), thus peer will see dgrams consistently
351 * coming from the same IP.
352 * We would like to connect the socket, but since peer's
353 * UDP code can be less perfect than ours, _peer's_ IP:port
354 * in replies may differ from IP:port we used to send
355 * our first packet. We can connect() only when we get
360 if (CMD_GET(option_mask32)) {
363 /* add filename and mode */
364 /* fill in packet if the filename fits into xbuf */
365 len = strlen(remote_file) + 1;
366 if (2 + len + sizeof("octet") >= io_bufsize) {
367 bb_error_msg("remote filename is too long");
370 strcpy(cp, remote_file);
372 /* add "mode" part of the packet */
374 cp += sizeof("octet");
376 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
377 if (blksize == TFTP_BLKSIZE_DEFAULT && !want_transfer_size)
380 /* Need to add option to pkt */
381 if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN tsize ") + sizeof(off_t)*3) {
382 bb_error_msg("remote filename is too long");
387 #endif /* ENABLE_TFTP */
389 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
391 if (blksize != TFTP_BLKSIZE_DEFAULT) {
392 /* add "blksize", <nul>, blksize, <nul> */
393 strcpy(cp, "blksize");
394 cp += sizeof("blksize");
395 cp += snprintf(cp, 6, "%d", blksize) + 1;
397 if (want_transfer_size) {
398 /* add "tsize", <nul>, size, <nul> (see RFC2349) */
399 /* if tftp and downloading, we send "0" (since we opened local_fd with O_TRUNC)
400 * and this makes server to send "tsize" option with the size */
401 /* if tftp and uploading, we send file size (maybe dont, to not confuse old servers???) */
402 /* if tftpd and downloading, we are answering to client's request */
403 /* if tftpd and uploading: !want_transfer_size, this code is not executed */
406 cp += sizeof("tsize");
408 fstat(local_fd, &st);
409 cp += sprintf(cp, "%"OFF_FMT"u", (off_t)st.st_size) + 1;
410 # if ENABLE_FEATURE_TFTP_PROGRESS_BAR
411 /* Save for progress bar. If 0 (tftp downloading),
412 * we look at server's reply later */
414 if (remote_file && st.st_size)
415 tftp_progress_init();
419 /* First packet is built, so skip packet generation */
423 /* Using mostly goto's - continue/break will be less clear
424 * in where we actually jump to */
426 /* Build ACK or DATA */
428 *((uint16_t*)cp) = htons(block_nr);
432 if (CMD_PUT(option_mask32)) {
434 len = full_read(local_fd, cp, blksize);
436 goto send_read_err_pkt;
438 if (len != blksize) {
445 *((uint16_t*)xbuf) = htons(opcode); /* fill in opcode part */
446 send_len = cp - xbuf;
447 /* NB: send_len value is preserved in code below
448 * for potential resend */
450 retries = TFTP_NUM_RETRIES; /* re-initialize */
451 waittime_ms = TFTP_TIMEOUT_MS;
454 #if ENABLE_TFTP_DEBUG
455 fprintf(stderr, "sending %u bytes\n", send_len);
456 for (cp = xbuf; cp < &xbuf[send_len]; cp++)
457 fprintf(stderr, "%02x ", (unsigned char) *cp);
458 fprintf(stderr, "\n");
460 xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
462 #if ENABLE_FEATURE_TFTP_PROGRESS_BAR
463 if (ENABLE_TFTP && remote_file) { /* tftp */
464 G.pos = (block_nr - 1) * (uoff_t)blksize;
467 /* Was it final ACK? then exit */
468 if (finished && (opcode == TFTP_ACK))
473 /*pfd[0].fd = socket_fd;*/
474 pfd[0].events = POLLIN;
475 switch (safe_poll(pfd, 1, waittime_ms)) {
477 /*bb_perror_msg("poll"); - done in safe_poll */
482 bb_error_msg("timeout");
483 goto ret; /* no err packet sent */
486 /* exponential backoff with limit */
487 waittime_ms += waittime_ms/2;
488 if (waittime_ms > TFTP_MAXTIMEOUT_MS) {
489 waittime_ms = TFTP_MAXTIMEOUT_MS;
492 goto send_again; /* resend last sent pkt */
495 /* tftp (not tftpd!) receiving 1st packet */
496 our_lsa = ((void*)(ptrdiff_t)-1); /* not NULL */
497 len = recvfrom(socket_fd, rbuf, io_bufsize, 0,
498 &peer_lsa->u.sa, &peer_lsa->len);
499 /* Our first dgram went to port 69
500 * but reply may come from different one.
501 * Remember and use this new port (and IP) */
503 xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
505 /* tftpd, or not the very first packet:
506 * socket is connect()ed, can just read from it. */
507 /* Don't full_read()!
508 * This is not TCP, one read == one pkt! */
509 len = safe_read(socket_fd, rbuf, io_bufsize);
512 goto send_read_err_pkt;
514 if (len < 4) { /* too small? */
519 /* Process recv'ed packet */
520 opcode = ntohs( ((uint16_t*)rbuf)[0] );
521 recv_blk = ntohs( ((uint16_t*)rbuf)[1] );
522 #if ENABLE_TFTP_DEBUG
523 fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk);
525 if (opcode == TFTP_ERROR) {
526 static const char errcode_str[] ALIGN1 =
532 "unknown transfer id\0"
533 "file already exists\0"
537 const char *msg = "";
539 if (len > 4 && rbuf[4] != '\0') {
541 rbuf[io_bufsize - 1] = '\0'; /* paranoia */
542 } else if (recv_blk <= 8) {
543 msg = nth_string(errcode_str, recv_blk);
545 bb_error_msg("server error: (%u) %s", recv_blk, msg);
549 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
552 if (opcode == TFTP_OACK) {
553 /* server seems to support options */
556 res = tftp_get_option("blksize", &rbuf[2], len - 2);
558 blksize = tftp_blksize_check(res, blksize);
560 error_pkt_reason = ERR_BAD_OPT;
563 io_bufsize = blksize + 4;
565 # if ENABLE_FEATURE_TFTP_PROGRESS_BAR
566 if (remote_file && G.size == 0) { /* if we don't know it yet */
567 res = tftp_get_option("tsize", &rbuf[2], len - 2);
569 G.size = bb_strtoull(res, NULL, 10);
571 tftp_progress_init();
575 if (CMD_GET(option_mask32)) {
576 /* We'll send ACK for OACK,
577 * such ACK has "block no" of 0 */
583 * "An option not acknowledged by the server
584 * must be ignored by the client and server
585 * as if it were never requested." */
586 if (blksize != TFTP_BLKSIZE_DEFAULT)
587 bb_error_msg("falling back to blocksize "TFTP_BLKSIZE_DEFAULT_STR);
588 blksize = TFTP_BLKSIZE_DEFAULT;
589 io_bufsize = TFTP_BLKSIZE_DEFAULT + 4;
592 /* block_nr is already advanced to next block# we expect
593 * to get / block# we are about to send next time */
595 if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) {
596 if (recv_blk == block_nr) {
597 int sz = full_write(local_fd, &rbuf[4], len - 4);
599 strcpy((char*)error_pkt_str, bb_msg_write_error);
600 error_pkt_reason = ERR_WRITE;
606 continue; /* send ACK */
608 /* Disabled to cope with servers with Sorcerer's Apprentice Syndrome */
610 if (recv_blk == (block_nr - 1)) {
611 /* Server lost our TFTP_ACK. Resend it */
618 if (CMD_PUT(option_mask32) && (opcode == TFTP_ACK)) {
619 /* did peer ACK our last DATA pkt? */
620 if (recv_blk == (uint16_t) (block_nr - 1)) {
623 continue; /* send next block */
626 /* Awww... recv'd packet is not recognized! */
628 /* why recv_again? - rfc1123 says:
629 * "The sender (i.e., the side originating the DATA packets)
630 * must never resend the current DATA packet on receipt
631 * of a duplicate ACK".
632 * DATA pkts are resent ONLY on timeout.
633 * Thus "goto send_again" will ba a bad mistake above.
635 * http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome
637 } /* end of "while (1)" */
639 if (ENABLE_FEATURE_CLEAN_UP) {
645 return finished == 0; /* returns 1 on failure */
648 strcpy((char*)error_pkt_str, bb_msg_read_error);
650 if (error_pkt_str[0])
651 bb_error_msg("%s", (char*)error_pkt_str);
652 error_pkt[1] = TFTP_ERROR;
653 xsendto(socket_fd, error_pkt, 4 + 1 + strlen((char*)error_pkt_str),
654 &peer_lsa->u.sa, peer_lsa->len);
661 int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
662 int tftp_main(int argc UNUSED_PARAM, char **argv)
664 len_and_sockaddr *peer_lsa;
665 const char *local_file = NULL;
666 const char *remote_file = NULL;
667 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
668 const char *blksize_str = TFTP_BLKSIZE_DEFAULT_STR;
677 /* -p or -g is mandatory, and they are mutually exclusive */
678 opt_complementary = "" IF_FEATURE_TFTP_GET("g:") IF_FEATURE_TFTP_PUT("p:")
679 IF_GETPUT("g--p:p--g:");
681 IF_GETPUT(opt =) getopt32(argv,
682 IF_FEATURE_TFTP_GET("g") IF_FEATURE_TFTP_PUT("p")
683 "l:r:" IF_FEATURE_TFTP_BLOCKSIZE("b:"),
684 &local_file, &remote_file
685 IF_FEATURE_TFTP_BLOCKSIZE(, &blksize_str));
688 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
689 /* Check if the blksize is valid:
690 * RFC2348 says between 8 and 65464 */
691 blksize = tftp_blksize_check(blksize_str, 65564);
693 //bb_error_msg("bad block size");
700 const char *slash = strrchr(remote_file, '/');
701 local_file = slash ? slash + 1 : remote_file;
704 remote_file = local_file;
707 /* Error if filename or host is not known */
708 if (!remote_file || !argv[0])
711 port = bb_lookup_port(argv[1], "udp", 69);
712 peer_lsa = xhost2sockaddr(argv[0], port);
714 # if ENABLE_TFTP_DEBUG
715 fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n",
716 xmalloc_sockaddr2dotted(&peer_lsa->u.sa),
717 remote_file, local_file);
720 # if ENABLE_FEATURE_TFTP_PROGRESS_BAR
721 G.file = remote_file;
723 result = tftp_protocol(
724 NULL /*our_lsa*/, peer_lsa,
725 local_file, remote_file
726 IF_FEATURE_TFTP_BLOCKSIZE(, 1 /* want_transfer_size */)
727 IF_FEATURE_TFTP_BLOCKSIZE(, blksize)
729 tftp_progress_done();
731 if (result != EXIT_SUCCESS && NOT_LONE_DASH(local_file) && CMD_GET(opt)) {
737 #endif /* ENABLE_TFTP */
740 int tftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
741 int tftpd_main(int argc UNUSED_PARAM, char **argv)
743 len_and_sockaddr *our_lsa;
744 len_and_sockaddr *peer_lsa;
745 char *local_file, *mode;
746 const char *error_msg;
747 int opt, result, opcode;
748 IF_FEATURE_TFTP_BLOCKSIZE(int blksize = TFTP_BLKSIZE_DEFAULT;)
749 IF_FEATURE_TFTP_BLOCKSIZE(int want_transfer_size = 0;)
753 our_lsa = get_sock_lsa(STDIN_FILENO);
755 /* This is confusing:
756 *bb_error_msg_and_die("stdin is not a socket");
759 /* Help text says that tftpd must be used as inetd service,
760 * which is by far the most usual cause of get_sock_lsa
763 peer_lsa = xzalloc(LSA_LEN_SIZE + our_lsa->len);
764 peer_lsa->len = our_lsa->len;
766 /* Shifting to not collide with TFTP_OPTs */
767 opt = option_mask32 = TFTPD_OPT | (getopt32(argv, "rcu:", &user_opt) << 8);
772 result = recv_from_to(STDIN_FILENO, block_buf, sizeof(block_buf),
774 &peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len);
776 error_msg = "malformed packet";
777 opcode = ntohs(*(uint16_t*)block_buf);
778 if (result < 4 || result >= sizeof(block_buf)
779 || block_buf[result-1] != '\0'
780 || (IF_FEATURE_TFTP_PUT(opcode != TFTP_RRQ) /* not download */
782 IF_FEATURE_TFTP_GET(opcode != TFTP_WRQ) /* not upload */
787 local_file = block_buf + 2;
788 if (local_file[0] == '.' || strstr(local_file, "/.")) {
789 error_msg = "dot in file name";
792 mode = local_file + strlen(local_file) + 1;
793 if (mode >= block_buf + result || strcmp(mode, "octet") != 0) {
796 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
799 char *opt_str = mode + sizeof("octet");
800 int opt_len = block_buf + result - opt_str;
802 res = tftp_get_option("blksize", opt_str, opt_len);
804 blksize = tftp_blksize_check(res, 65564);
806 error_pkt_reason = ERR_BAD_OPT;
807 /* will just send error pkt */
811 if (opcode != TFTP_WRQ /* download? */
812 /* did client ask us about file size? */
813 && tftp_get_option("tsize", opt_str, opt_len)
815 want_transfer_size = 1;
821 if (!ENABLE_FEATURE_TFTP_PUT || opcode == TFTP_WRQ) {
822 if (opt & TFTPD_OPT_r) {
823 /* This would mean "disk full" - not true */
824 /*error_pkt_reason = ERR_WRITE;*/
825 error_msg = bb_msg_write_error;
828 IF_GETPUT(option_mask32 |= TFTP_OPT_GET;) /* will receive file's data */
830 IF_GETPUT(option_mask32 |= TFTP_OPT_PUT;) /* will send file's data */
833 /* NB: if error_pkt_str or error_pkt_reason is set up,
834 * tftp_protocol() just sends one error pkt and returns */
837 close(STDIN_FILENO); /* close old, possibly wildcard socket */
838 /* tftp_protocol() will create new one, bound to particular local IP */
839 result = tftp_protocol(
841 local_file IF_TFTP(, NULL /*remote_file*/)
842 IF_FEATURE_TFTP_BLOCKSIZE(, want_transfer_size)
843 IF_FEATURE_TFTP_BLOCKSIZE(, blksize)
848 strcpy((char*)error_pkt_str, error_msg);
852 #endif /* ENABLE_TFTPD */
854 #endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */