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 #define TFTP_TIMEOUT_MS 50
28 #define TFTP_MAXTIMEOUT_MS 2000
29 #define TFTP_NUM_RETRIES 12 /* number of backed-off retries */
31 /* opcodes we support */
39 /* error codes sent over network (we use only 0, 1, 3 and 8) */
40 /* generic (error message is included in the packet) */
44 /* disk full or allocation exceeded */
49 #define ERR_BAD_USER 7
52 /* masks coming from getopt32 */
54 TFTP_OPT_GET = (1 << 0),
55 TFTP_OPT_PUT = (1 << 1),
56 /* pseudo option: if set, it's tftpd */
57 TFTPD_OPT = (1 << 7) * ENABLE_TFTPD,
58 TFTPD_OPT_r = (1 << 8) * ENABLE_TFTPD,
59 TFTPD_OPT_c = (1 << 9) * ENABLE_TFTPD,
60 TFTPD_OPT_u = (1 << 10) * ENABLE_TFTPD,
63 #if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
64 #define IF_GETPUT(...)
65 #define CMD_GET(cmd) 1
66 #define CMD_PUT(cmd) 0
67 #elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
68 #define IF_GETPUT(...)
69 #define CMD_GET(cmd) 0
70 #define CMD_PUT(cmd) 1
72 #define IF_GETPUT(...) __VA_ARGS__
73 #define CMD_GET(cmd) ((cmd) & TFTP_OPT_GET)
74 #define CMD_PUT(cmd) ((cmd) & TFTP_OPT_PUT)
76 /* NB: in the code below
77 * CMD_GET(cmd) and CMD_PUT(cmd) are mutually exclusive
82 /* u16 TFTP_ERROR; u16 reason; both network-endian, then error text: */
83 uint8_t error_pkt[4 + 32];
85 /* used in tftpd_main(), a bit big for stack: */
86 char block_buf[TFTP_BLKSIZE_DEFAULT];
87 #if ENABLE_FEATURE_TFTP_PROGRESS_BAR
94 #define G (*(struct globals*)&bb_common_bufsiz1)
95 struct BUG_G_too_big {
96 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
98 #define block_buf (G.block_buf )
99 #define user_opt (G.user_opt )
100 #define error_pkt (G.error_pkt )
101 #define INIT_G() do { } while (0)
103 #define error_pkt_reason (error_pkt[3])
104 #define error_pkt_str (error_pkt + 4)
106 #if ENABLE_FEATURE_TFTP_PROGRESS_BAR
107 /* SIGALRM logic nicked from the wget applet */
108 static void progress_meter(int flag)
110 /* We can be called from signal handler */
111 int save_errno = errno;
113 if (flag == -1) { /* first call to progress_meter */
114 bb_progress_init(&G.pmt);
117 bb_progress_update(&G.pmt, G.file, 0, G.pos, G.size);
120 /* last call to progress_meter */
124 if (flag == -1) { /* first call to progress_meter */
125 signal_SA_RESTART_empty_mask(SIGALRM, progress_meter);
132 static void tftp_progress_init(void)
136 static void tftp_progress_done(void)
141 # define tftp_progress_init() ((void)0)
142 # define tftp_progress_done() ((void)0)
145 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
147 static int tftp_blksize_check(const char *blksize_str, int maxsize)
149 /* Check if the blksize is valid:
150 * RFC2348 says between 8 and 65464,
151 * but our implementation makes it impossible
152 * to use blksizes smaller than 22 octets. */
153 unsigned blksize = bb_strtou(blksize_str, NULL, 10);
155 || (blksize < 24) || (blksize > maxsize)
157 bb_error_msg("bad blocksize '%s'", blksize_str);
160 # if ENABLE_TFTP_DEBUG
161 bb_error_msg("using blksize %u", blksize);
166 static char *tftp_get_option(const char *option, char *buf, int len)
173 * "opt_name<NUL>opt_val<NUL>opt_name2<NUL>opt_val2<NUL>..." */
176 /* Make sure options are terminated correctly */
177 for (k = 0; k < len; k++) {
178 if (buf[k] == '\0') {
184 if (opt_val == 0) { /* it's "name" part */
185 if (strcasecmp(buf, option) == 0) {
188 } else if (opt_found) {
203 static int tftp_protocol(
204 /* NULL if tftp, !NULL if tftpd: */
205 len_and_sockaddr *our_lsa,
206 len_and_sockaddr *peer_lsa,
207 const char *local_file
208 IF_TFTP(, const char *remote_file)
210 # define remote_file NULL
212 /* 1 for tftp; 1/0 for tftpd depending whether client asked about it: */
213 IF_FEATURE_TFTP_BLOCKSIZE(, int want_transfer_size)
214 IF_FEATURE_TFTP_BLOCKSIZE(, int blksize))
216 #if !ENABLE_FEATURE_TFTP_BLOCKSIZE
217 enum { blksize = TFTP_BLKSIZE_DEFAULT };
220 struct pollfd pfd[1];
221 #define socket_fd (pfd[0].fd)
224 IF_FEATURE_TFTP_BLOCKSIZE(smallint expect_OACK = 0;)
225 smallint finished = 0;
229 int open_mode, local_fd;
230 int retries, waittime_ms;
231 int io_bufsize = blksize + 4;
233 /* Can't use RESERVE_CONFIG_BUFFER here since the allocation
234 * size varies meaning BUFFERS_GO_ON_STACK would fail.
236 * We must keep the transmit and receive buffers separate
237 * in case we rcv a garbage pkt - we need to rexmit the last pkt.
239 char *xbuf = xmalloc(io_bufsize);
240 char *rbuf = xmalloc(io_bufsize);
242 socket_fd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0);
243 setsockopt_reuseaddr(socket_fd);
245 if (!ENABLE_TFTP || our_lsa) { /* tftpd */
246 /* Create a socket which is:
247 * 1. bound to IP:port peer sent 1st datagram to,
248 * 2. connected to peer's IP:port
249 * This way we will answer from the IP:port peer
250 * expects, will not get any other packets on
251 * the socket, and also plain read/write will work. */
252 xbind(socket_fd, &our_lsa->u.sa, our_lsa->len);
253 xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
255 /* Is there an error already? Send pkt and bail out */
256 if (error_pkt_reason || error_pkt_str[0])
260 struct passwd *pw = xgetpwnam(user_opt);
261 change_identity(pw); /* initgroups, setgid, setuid */
265 /* Prepare open mode */
266 if (CMD_PUT(option_mask32)) {
267 open_mode = O_RDONLY;
269 open_mode = O_WRONLY | O_TRUNC | O_CREAT;
271 if ((option_mask32 & (TFTPD_OPT+TFTPD_OPT_c)) == TFTPD_OPT) {
272 /* tftpd without -c */
273 open_mode = O_WRONLY | O_TRUNC;
278 /* Examples of network traffic.
279 * Note two cases when ACKs with block# of 0 are sent.
281 * Download without options:
282 * tftp -> "\0\1FILENAME\0octet\0"
283 * "\0\3\0\1FILEDATA..." <- tftpd
286 * Download with option of blksize 16384:
287 * tftp -> "\0\1FILENAME\0octet\0blksize\00016384\0"
288 * "\0\6blksize\00016384\0" <- tftpd
290 * "\0\3\0\1FILEDATA..." <- tftpd
293 * Upload without options:
294 * tftp -> "\0\2FILENAME\0octet\0"
295 * "\0\4\0\0" <- tftpd
296 * tftp -> "\0\3\0\1FILEDATA..."
297 * "\0\4\0\1" <- tftpd
299 * Upload with option of blksize 16384:
300 * tftp -> "\0\2FILENAME\0octet\0blksize\00016384\0"
301 * "\0\6blksize\00016384\0" <- tftpd
302 * tftp -> "\0\3\0\1FILEDATA..."
303 * "\0\4\0\1" <- tftpd
309 if (!ENABLE_TFTP || our_lsa) { /* tftpd */
310 /* Open file (must be after changing user) */
311 local_fd = open(local_file, open_mode);
313 error_pkt_reason = ERR_NOFILE;
314 strcpy((char*)error_pkt_str, "can't open file");
317 /* gcc 4.3.1 would NOT optimize it out as it should! */
318 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
319 if (blksize != TFTP_BLKSIZE_DEFAULT || want_transfer_size) {
320 /* Create and send OACK packet. */
321 /* For the download case, block_nr is still 1 -
322 * we expect 1st ACK from peer to be for (block_nr-1),
323 * that is, for "block 0" which is our OACK pkt */
325 goto add_blksize_opt;
328 if (CMD_GET(option_mask32)) {
329 /* It's upload and we don't send OACK.
330 * We must ACK 1st packet (with filename)
331 * as if it is "block 0" */
336 /* Open file (must be after changing user) */
337 local_fd = CMD_GET(option_mask32) ? STDOUT_FILENO : STDIN_FILENO;
338 if (NOT_LONE_DASH(local_file))
339 local_fd = xopen(local_file, open_mode);
340 /* Removing #if, or using if() statement instead of #if may lead to
341 * "warning: null argument where non-null required": */
345 /* We can't (and don't really need to) bind the socket:
346 * we don't know from which local IP datagrams will be sent,
347 * but kernel will pick the same IP every time (unless routing
348 * table is changed), thus peer will see dgrams consistently
349 * coming from the same IP.
350 * We would like to connect the socket, but since peer's
351 * UDP code can be less perfect than ours, _peer's_ IP:port
352 * in replies may differ from IP:port we used to send
353 * our first packet. We can connect() only when we get
358 if (CMD_GET(option_mask32)) {
361 /* add filename and mode */
362 /* fill in packet if the filename fits into xbuf */
363 len = strlen(remote_file) + 1;
364 if (2 + len + sizeof("octet") >= io_bufsize) {
365 bb_error_msg("remote filename is too long");
368 strcpy(cp, remote_file);
370 /* add "mode" part of the packet */
372 cp += sizeof("octet");
374 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
375 if (blksize == TFTP_BLKSIZE_DEFAULT && !want_transfer_size)
378 /* Need to add option to pkt */
379 if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN tsize ") + sizeof(off_t)*3) {
380 bb_error_msg("remote filename is too long");
385 #endif /* ENABLE_TFTP */
387 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
389 if (blksize != TFTP_BLKSIZE_DEFAULT) {
390 /* add "blksize", <nul>, blksize, <nul> */
391 strcpy(cp, "blksize");
392 cp += sizeof("blksize");
393 cp += snprintf(cp, 6, "%d", blksize) + 1;
395 if (want_transfer_size) {
396 /* add "tsize", <nul>, size, <nul> (see RFC2349) */
397 /* if tftp and downloading, we send "0" (since we opened local_fd with O_TRUNC)
398 * and this makes server to send "tsize" option with the size */
399 /* if tftp and uploading, we send file size (maybe dont, to not confuse old servers???) */
400 /* if tftpd and downloading, we are answering to client's request */
401 /* if tftpd and uploading: !want_transfer_size, this code is not executed */
404 cp += sizeof("tsize");
406 fstat(local_fd, &st);
407 cp += sprintf(cp, "%"OFF_FMT"u", (off_t)st.st_size) + 1;
408 # if ENABLE_FEATURE_TFTP_PROGRESS_BAR
409 /* Save for progress bar. If 0 (tftp downloading),
410 * we look at server's reply later */
412 if (remote_file && st.st_size)
413 tftp_progress_init();
417 /* First packet is built, so skip packet generation */
421 /* Using mostly goto's - continue/break will be less clear
422 * in where we actually jump to */
424 /* Build ACK or DATA */
426 *((uint16_t*)cp) = htons(block_nr);
430 if (CMD_PUT(option_mask32)) {
432 len = full_read(local_fd, cp, blksize);
434 goto send_read_err_pkt;
436 if (len != blksize) {
443 *((uint16_t*)xbuf) = htons(opcode); /* fill in opcode part */
444 send_len = cp - xbuf;
445 /* NB: send_len value is preserved in code below
446 * for potential resend */
448 retries = TFTP_NUM_RETRIES; /* re-initialize */
449 waittime_ms = TFTP_TIMEOUT_MS;
452 #if ENABLE_TFTP_DEBUG
453 fprintf(stderr, "sending %u bytes\n", send_len);
454 for (cp = xbuf; cp < &xbuf[send_len]; cp++)
455 fprintf(stderr, "%02x ", (unsigned char) *cp);
456 fprintf(stderr, "\n");
458 xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
460 #if ENABLE_FEATURE_TFTP_PROGRESS_BAR
461 if (ENABLE_TFTP && remote_file) { /* tftp */
462 G.pos = (block_nr - 1) * (uoff_t)blksize;
465 /* Was it final ACK? then exit */
466 if (finished && (opcode == TFTP_ACK))
471 /*pfd[0].fd = socket_fd;*/
472 pfd[0].events = POLLIN;
473 switch (safe_poll(pfd, 1, waittime_ms)) {
475 /*bb_perror_msg("poll"); - done in safe_poll */
480 bb_error_msg("timeout");
481 goto ret; /* no err packet sent */
484 /* exponential backoff with limit */
485 waittime_ms += waittime_ms/2;
486 if (waittime_ms > TFTP_MAXTIMEOUT_MS) {
487 waittime_ms = TFTP_MAXTIMEOUT_MS;
490 goto send_again; /* resend last sent pkt */
493 /* tftp (not tftpd!) receiving 1st packet */
494 our_lsa = ((void*)(ptrdiff_t)-1); /* not NULL */
495 len = recvfrom(socket_fd, rbuf, io_bufsize, 0,
496 &peer_lsa->u.sa, &peer_lsa->len);
497 /* Our first dgram went to port 69
498 * but reply may come from different one.
499 * Remember and use this new port (and IP) */
501 xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
503 /* tftpd, or not the very first packet:
504 * socket is connect()ed, can just read from it. */
505 /* Don't full_read()!
506 * This is not TCP, one read == one pkt! */
507 len = safe_read(socket_fd, rbuf, io_bufsize);
510 goto send_read_err_pkt;
512 if (len < 4) { /* too small? */
517 /* Process recv'ed packet */
518 opcode = ntohs( ((uint16_t*)rbuf)[0] );
519 recv_blk = ntohs( ((uint16_t*)rbuf)[1] );
520 #if ENABLE_TFTP_DEBUG
521 fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk);
523 if (opcode == TFTP_ERROR) {
524 static const char errcode_str[] ALIGN1 =
530 "unknown transfer id\0"
531 "file already exists\0"
535 const char *msg = "";
537 if (len > 4 && rbuf[4] != '\0') {
539 rbuf[io_bufsize - 1] = '\0'; /* paranoia */
540 } else if (recv_blk <= 8) {
541 msg = nth_string(errcode_str, recv_blk);
543 bb_error_msg("server error: (%u) %s", recv_blk, msg);
547 #if ENABLE_FEATURE_TFTP_BLOCKSIZE
550 if (opcode == TFTP_OACK) {
551 /* server seems to support options */
554 res = tftp_get_option("blksize", &rbuf[2], len - 2);
556 blksize = tftp_blksize_check(res, blksize);
558 error_pkt_reason = ERR_BAD_OPT;
561 io_bufsize = blksize + 4;
563 # if ENABLE_FEATURE_TFTP_PROGRESS_BAR
564 if (remote_file && G.size == 0) { /* if we don't know it yet */
565 res = tftp_get_option("tsize", &rbuf[2], len - 2);
567 G.size = bb_strtoull(res, NULL, 10);
569 tftp_progress_init();
573 if (CMD_GET(option_mask32)) {
574 /* We'll send ACK for OACK,
575 * such ACK has "block no" of 0 */
581 * "An option not acknowledged by the server
582 * must be ignored by the client and server
583 * as if it were never requested." */
584 bb_error_msg("server only supports blocksize of 512");
585 blksize = TFTP_BLKSIZE_DEFAULT;
586 io_bufsize = TFTP_BLKSIZE_DEFAULT + 4;
589 /* block_nr is already advanced to next block# we expect
590 * to get / block# we are about to send next time */
592 if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) {
593 if (recv_blk == block_nr) {
594 int sz = full_write(local_fd, &rbuf[4], len - 4);
596 strcpy((char*)error_pkt_str, bb_msg_write_error);
597 error_pkt_reason = ERR_WRITE;
603 continue; /* send ACK */
605 /* Disabled to cope with servers with Sorcerer's Apprentice Syndrome */
607 if (recv_blk == (block_nr - 1)) {
608 /* Server lost our TFTP_ACK. Resend it */
615 if (CMD_PUT(option_mask32) && (opcode == TFTP_ACK)) {
616 /* did peer ACK our last DATA pkt? */
617 if (recv_blk == (uint16_t) (block_nr - 1)) {
620 continue; /* send next block */
623 /* Awww... recv'd packet is not recognized! */
625 /* why recv_again? - rfc1123 says:
626 * "The sender (i.e., the side originating the DATA packets)
627 * must never resend the current DATA packet on receipt
628 * of a duplicate ACK".
629 * DATA pkts are resent ONLY on timeout.
630 * Thus "goto send_again" will ba a bad mistake above.
632 * http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome
634 } /* end of "while (1)" */
636 if (ENABLE_FEATURE_CLEAN_UP) {
642 return finished == 0; /* returns 1 on failure */
645 strcpy((char*)error_pkt_str, bb_msg_read_error);
647 if (error_pkt_str[0])
648 bb_error_msg("%s", (char*)error_pkt_str);
649 error_pkt[1] = TFTP_ERROR;
650 xsendto(socket_fd, error_pkt, 4 + 1 + strlen((char*)error_pkt_str),
651 &peer_lsa->u.sa, peer_lsa->len);
658 int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
659 int tftp_main(int argc UNUSED_PARAM, char **argv)
661 len_and_sockaddr *peer_lsa;
662 const char *local_file = NULL;
663 const char *remote_file = NULL;
664 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
665 const char *blksize_str = TFTP_BLKSIZE_DEFAULT_STR;
674 /* -p or -g is mandatory, and they are mutually exclusive */
675 opt_complementary = "" IF_FEATURE_TFTP_GET("g:") IF_FEATURE_TFTP_PUT("p:")
676 IF_GETPUT("g--p:p--g:");
678 IF_GETPUT(opt =) getopt32(argv,
679 IF_FEATURE_TFTP_GET("g") IF_FEATURE_TFTP_PUT("p")
680 "l:r:" IF_FEATURE_TFTP_BLOCKSIZE("b:"),
681 &local_file, &remote_file
682 IF_FEATURE_TFTP_BLOCKSIZE(, &blksize_str));
685 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
686 /* Check if the blksize is valid:
687 * RFC2348 says between 8 and 65464 */
688 blksize = tftp_blksize_check(blksize_str, 65564);
690 //bb_error_msg("bad block size");
697 const char *slash = strrchr(remote_file, '/');
698 local_file = slash ? slash + 1 : remote_file;
701 remote_file = local_file;
704 /* Error if filename or host is not known */
705 if (!remote_file || !argv[0])
708 port = bb_lookup_port(argv[1], "udp", 69);
709 peer_lsa = xhost2sockaddr(argv[0], port);
711 # if ENABLE_TFTP_DEBUG
712 fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n",
713 xmalloc_sockaddr2dotted(&peer_lsa->u.sa),
714 remote_file, local_file);
717 # if ENABLE_FEATURE_TFTP_PROGRESS_BAR
718 G.file = remote_file;
720 result = tftp_protocol(
721 NULL /*our_lsa*/, peer_lsa,
722 local_file, remote_file
723 IF_FEATURE_TFTP_BLOCKSIZE(, 1 /* want_transfer_size */)
724 IF_FEATURE_TFTP_BLOCKSIZE(, blksize)
726 tftp_progress_done();
728 if (result != EXIT_SUCCESS && NOT_LONE_DASH(local_file) && CMD_GET(opt)) {
734 #endif /* ENABLE_TFTP */
737 int tftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
738 int tftpd_main(int argc UNUSED_PARAM, char **argv)
740 len_and_sockaddr *our_lsa;
741 len_and_sockaddr *peer_lsa;
742 char *local_file, *mode;
743 const char *error_msg;
744 int opt, result, opcode;
745 IF_FEATURE_TFTP_BLOCKSIZE(int blksize = TFTP_BLKSIZE_DEFAULT;)
746 IF_FEATURE_TFTP_BLOCKSIZE(int want_transfer_size = 0;)
750 our_lsa = get_sock_lsa(STDIN_FILENO);
752 /* This is confusing:
753 *bb_error_msg_and_die("stdin is not a socket");
756 /* Help text says that tftpd must be used as inetd service,
757 * which is by far the most usual cause of get_sock_lsa
760 peer_lsa = xzalloc(LSA_LEN_SIZE + our_lsa->len);
761 peer_lsa->len = our_lsa->len;
763 /* Shifting to not collide with TFTP_OPTs */
764 opt = option_mask32 = TFTPD_OPT | (getopt32(argv, "rcu:", &user_opt) << 8);
769 result = recv_from_to(STDIN_FILENO, block_buf, sizeof(block_buf),
771 &peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len);
773 error_msg = "malformed packet";
774 opcode = ntohs(*(uint16_t*)block_buf);
775 if (result < 4 || result >= sizeof(block_buf)
776 || block_buf[result-1] != '\0'
777 || (IF_FEATURE_TFTP_PUT(opcode != TFTP_RRQ) /* not download */
779 IF_FEATURE_TFTP_GET(opcode != TFTP_WRQ) /* not upload */
784 local_file = block_buf + 2;
785 if (local_file[0] == '.' || strstr(local_file, "/.")) {
786 error_msg = "dot in file name";
789 mode = local_file + strlen(local_file) + 1;
790 if (mode >= block_buf + result || strcmp(mode, "octet") != 0) {
793 # if ENABLE_FEATURE_TFTP_BLOCKSIZE
796 char *opt_str = mode + sizeof("octet");
797 int opt_len = block_buf + result - opt_str;
799 res = tftp_get_option("blksize", opt_str, opt_len);
801 blksize = tftp_blksize_check(res, 65564);
803 error_pkt_reason = ERR_BAD_OPT;
804 /* will just send error pkt */
808 if (opcode != TFTP_WRQ /* download? */
809 /* did client ask us about file size? */
810 && tftp_get_option("tsize", opt_str, opt_len)
812 want_transfer_size = 1;
818 if (!ENABLE_FEATURE_TFTP_PUT || opcode == TFTP_WRQ) {
819 if (opt & TFTPD_OPT_r) {
820 /* This would mean "disk full" - not true */
821 /*error_pkt_reason = ERR_WRITE;*/
822 error_msg = bb_msg_write_error;
825 IF_GETPUT(option_mask32 |= TFTP_OPT_GET;) /* will receive file's data */
827 IF_GETPUT(option_mask32 |= TFTP_OPT_PUT;) /* will send file's data */
830 /* NB: if error_pkt_str or error_pkt_reason is set up,
831 * tftp_protocol() just sends one error pkt and returns */
834 close(STDIN_FILENO); /* close old, possibly wildcard socket */
835 /* tftp_protocol() will create new one, bound to particular local IP */
836 result = tftp_protocol(
838 local_file IF_TFTP(, NULL /*remote_file*/)
839 IF_FEATURE_TFTP_BLOCKSIZE(, want_transfer_size)
840 IF_FEATURE_TFTP_BLOCKSIZE(, blksize)
845 strcpy((char*)error_pkt_str, error_msg);
849 #endif /* ENABLE_TFTPD */
851 #endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */