mirror of
https://github.com/sheumann/hush.git
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function old new delta tftp_protocol 1316 1466 +150 packed_usage 23774 23798 +24 tftpd_main 509 502 -7 tftp_main 311 252 -59 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/2 up/down: 174/-66) Total: 108 bytes text data bss dec hex filename 797700 641 7380 805721 c4b59 busybox_old 797833 641 7380 805854 c4bde busybox_unstripped
716 lines
19 KiB
C
716 lines
19 KiB
C
/* vi: set sw=4 ts=4: */
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/* -------------------------------------------------------------------------
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* tftp.c
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*
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* A simple tftp client/server for busybox.
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* Tries to follow RFC1350.
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* Only "octet" mode supported.
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* Optional blocksize negotiation (RFC2347 + RFC2348)
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*
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* Copyright (C) 2001 Magnus Damm <damm@opensource.se>
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*
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* Parts of the code based on:
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*
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* atftp: Copyright (C) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca>
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* and Remi Lefebvre <remi@debian.org>
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*
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* utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de>
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*
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* tftpd added by Denys Vlasenko & Vladimir Dronnikov
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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* ------------------------------------------------------------------------- */
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#include "libbb.h"
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#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
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#define TFTP_BLKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
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#define TFTP_TIMEOUT_MS 50
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#define TFTP_MAXTIMEOUT_MS 2000
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#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */
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/* opcodes we support */
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#define TFTP_RRQ 1
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#define TFTP_WRQ 2
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#define TFTP_DATA 3
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#define TFTP_ACK 4
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#define TFTP_ERROR 5
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#define TFTP_OACK 6
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/* error codes sent over network (we use only 0, 3 and 8) */
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/* generic (error message is included in the packet) */
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#define ERR_UNSPEC 0
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#define ERR_NOFILE 1
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#define ERR_ACCESS 2
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/* disk full or allocation exceeded */
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#define ERR_WRITE 3
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#define ERR_OP 4
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#define ERR_BAD_ID 5
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#define ERR_EXIST 6
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#define ERR_BAD_USER 7
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#define ERR_BAD_OPT 8
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/* masks coming from getopt32 */
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enum {
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TFTP_OPT_GET = (1 << 0),
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TFTP_OPT_PUT = (1 << 1),
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/* pseudo option: if set, it's tftpd */
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TFTPD_OPT = (1 << 7) * ENABLE_TFTPD,
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TFTPD_OPT_r = (1 << 8) * ENABLE_TFTPD,
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TFTPD_OPT_c = (1 << 9) * ENABLE_TFTPD,
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TFTPD_OPT_u = (1 << 10) * ENABLE_TFTPD,
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};
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#if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
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#define USE_GETPUT(...)
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#define CMD_GET(cmd) 1
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#define CMD_PUT(cmd) 0
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#elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
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#define USE_GETPUT(...)
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#define CMD_GET(cmd) 0
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#define CMD_PUT(cmd) 1
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#else
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#define USE_GETPUT(...) __VA_ARGS__
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#define CMD_GET(cmd) ((cmd) & TFTP_OPT_GET)
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#define CMD_PUT(cmd) ((cmd) & TFTP_OPT_PUT)
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#endif
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/* NB: in the code below
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* CMD_GET(cmd) and CMD_PUT(cmd) are mutually exclusive
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*/
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struct globals {
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/* u16 TFTP_ERROR; u16 reason; both network-endian, then error text: */
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uint8_t error_pkt[4 + 32];
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#if ENABLE_TFTPD
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char *user_opt;
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#endif
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/* used in tftpd_main(), a bit big for stack: */
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char block_buf[TFTP_BLKSIZE_DEFAULT];
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};
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define block_buf (G.block_buf )
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#define user_opt (G.user_opt )
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#define error_pkt (G.error_pkt )
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#define INIT_G() \
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do { \
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} while (0)
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#define error_pkt_reason (error_pkt[3])
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#define error_pkt_str (error_pkt + 4)
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#if ENABLE_FEATURE_TFTP_BLOCKSIZE
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static int tftp_blksize_check(const char *blksize_str, int maxsize)
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{
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/* Check if the blksize is valid:
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* RFC2348 says between 8 and 65464,
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* but our implementation makes it impossible
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* to use blksizes smaller than 22 octets. */
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unsigned blksize = bb_strtou(blksize_str, NULL, 10);
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if (errno
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|| (blksize < 24) || (blksize > maxsize)
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) {
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bb_error_msg("bad blocksize '%s'", blksize_str);
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return -1;
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}
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#if ENABLE_DEBUG_TFTP
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bb_error_msg("using blksize %u", blksize);
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#endif
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return blksize;
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}
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static char *tftp_get_blksize(char *buf, int len)
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{
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#define option "blksize"
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int opt_val = 0;
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int opt_found = 0;
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int k;
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/* buf points to:
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* "opt_name<NUL>opt_val<NUL>opt_name2<NUL>opt_val2<NUL>..." */
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while (len > 0) {
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/* Make sure options are terminated correctly */
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for (k = 0; k < len; k++) {
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if (buf[k] == '\0') {
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goto nul_found;
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}
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}
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return NULL;
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nul_found:
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if (opt_val == 0) { /* it's "name" part */
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if (strcasecmp(buf, option) == 0) {
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opt_found = 1;
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}
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} else if (opt_found) {
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return buf;
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}
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k++;
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buf += k;
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len -= k;
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opt_val ^= 1;
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}
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return NULL;
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#undef option
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}
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#endif
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static int tftp_protocol(
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len_and_sockaddr *our_lsa,
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len_and_sockaddr *peer_lsa,
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const char *local_file,
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USE_TFTP(const char *remote_file,)
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int blksize)
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{
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#if !ENABLE_TFTP
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#define remote_file NULL
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#endif
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struct pollfd pfd[1];
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#define socket_fd (pfd[0].fd)
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int len;
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int send_len;
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USE_FEATURE_TFTP_BLOCKSIZE(smallint want_option_ack = 0;)
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smallint finished = 0;
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uint16_t opcode;
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uint16_t block_nr;
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uint16_t recv_blk;
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int open_mode, local_fd;
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int retries, waittime_ms;
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int io_bufsize = blksize + 4;
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char *cp;
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/* Can't use RESERVE_CONFIG_BUFFER here since the allocation
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* size varies meaning BUFFERS_GO_ON_STACK would fail */
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/* We must keep the transmit and receive buffers seperate */
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/* In case we rcv a garbage pkt and we need to rexmit the last pkt */
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char *xbuf = xmalloc(io_bufsize);
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char *rbuf = xmalloc(io_bufsize);
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socket_fd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0);
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setsockopt_reuseaddr(socket_fd);
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#if ENABLE_TFTPD
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if (user_opt) {
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struct passwd *pw = getpwnam(user_opt); /* initgroups, setgid, setuid */
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if (!pw)
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bb_error_msg_and_die("unknown user '%s'", user_opt);
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change_identity(pw);
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}
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#endif
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if (CMD_PUT(option_mask32)) {
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open_mode = O_RDONLY;
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} else {
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open_mode = O_WRONLY | O_TRUNC | O_CREAT;
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#if ENABLE_TFTPD
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if ((option_mask32 & (TFTPD_OPT+TFTPD_OPT_c)) == TFTPD_OPT) {
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/* tftpd without -c */
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open_mode = O_WRONLY | O_TRUNC;
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}
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#endif
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}
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if (!(option_mask32 & TFTPD_OPT)) {
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local_fd = CMD_GET(option_mask32) ? STDOUT_FILENO : STDIN_FILENO;
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if (NOT_LONE_DASH(local_file))
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local_fd = xopen(local_file, open_mode);
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} else {
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local_fd = open_or_warn(local_file, open_mode);
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if (local_fd < 0) {
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/*error_pkt_reason = ERR_NOFILE/ERR_ACCESS?*/
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strcpy(error_pkt_str, "can't open file");
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goto send_err_pkt;
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}
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}
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block_nr = 1;
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if (!ENABLE_TFTP || our_lsa) {
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/* tftpd */
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/* Create a socket which is:
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* 1. bound to IP:port peer sent 1st datagram to,
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* 2. connected to peer's IP:port
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* This way we will answer from the IP:port peer
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* expects, will not get any other packets on
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* the socket, and also plain read/write will work. */
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xbind(socket_fd, &our_lsa->u.sa, our_lsa->len);
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xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
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/* Is there an error already? Send pkt and bail out */
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if (error_pkt_reason || error_pkt_str[0])
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goto send_err_pkt;
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if (CMD_GET(option_mask32)) {
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/* it's upload - we must ACK 1st packet (with filename)
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* as if it's "block 0" */
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block_nr = 0;
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}
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#if ENABLE_FEATURE_TFTP_BLOCKSIZE
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if (blksize != TFTP_BLKSIZE_DEFAULT) {
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/* Create and send OACK packet */
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/* For the download case, block_nr is still 1 -
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* we expect 1st ACK from peer to be for (block_nr-1),
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* that is, for "block 0" which is our OACK pkt */
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opcode = TFTP_OACK;
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cp = xbuf + 2;
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goto add_blksize_opt;
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}
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/* else: just fall into while (1) loop below */
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#endif
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} else {
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/* tftp */
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/* We can't (and don't really need to) bind the socket:
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* we don't know from which local IP datagrams will be sent,
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* but kernel will pick the same IP every time (unless routing
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* table is changed), thus peer will see dgrams consistently
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* coming from the same IP.
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* We would like to connect the socket, but since peer's
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* UDP code can be less perfect than ours, _peer's_ IP:port
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* in replies may differ from IP:port we used to send
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* our first packet. We can connect() only when we get
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* first reply. */
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/* build opcode */
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opcode = TFTP_WRQ;
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if (CMD_GET(option_mask32)) {
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opcode = TFTP_RRQ;
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}
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cp = xbuf + 2;
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/* add filename and mode */
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/* fill in packet if the filename fits into xbuf */
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len = strlen(remote_file) + 1;
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if (2 + len + sizeof("octet") >= io_bufsize) {
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bb_error_msg("remote filename is too long");
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goto ret;
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}
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strcpy(cp, remote_file);
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cp += len;
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/* add "mode" part of the package */
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strcpy(cp, "octet");
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cp += sizeof("octet");
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#if ENABLE_FEATURE_TFTP_BLOCKSIZE
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if (blksize != TFTP_BLKSIZE_DEFAULT) {
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/* rfc2348 says that 65464 is a max allowed value */
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if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN")) {
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bb_error_msg("remote filename is too long");
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goto ret;
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}
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want_option_ack = 1;
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add_blksize_opt:
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/* add "blksize", <nul>, blksize, <nul> */
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strcpy(cp, "blksize");
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cp += sizeof("blksize");
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cp += snprintf(cp, 6, "%d", blksize) + 1;
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}
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#endif
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/* First packet is built, so skip packet generation */
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goto send_pkt;
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}
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/* Using mostly goto's - continue/break will be less clear
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* in where we actually jump to */
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while (1) {
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/* Build ACK or DATA */
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cp = xbuf + 2;
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*((uint16_t*)cp) = htons(block_nr);
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cp += 2;
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block_nr++;
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opcode = TFTP_ACK;
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if (CMD_PUT(option_mask32)) {
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opcode = TFTP_DATA;
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len = full_read(local_fd, cp, blksize);
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if (len < 0) {
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goto send_read_err_pkt;
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}
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if (len != blksize) {
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finished = 1;
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}
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cp += len;
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}
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send_pkt:
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/* Send packet */
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*((uint16_t*)xbuf) = htons(opcode); /* fill in opcode part */
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send_len = cp - xbuf;
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/* NB: send_len value is preserved in code below
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* for potential resend */
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retries = TFTP_NUM_RETRIES; /* re-initialize */
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waittime_ms = TFTP_TIMEOUT_MS;
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send_again:
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#if ENABLE_DEBUG_TFTP
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fprintf(stderr, "sending %u bytes\n", send_len);
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for (cp = xbuf; cp < &xbuf[send_len]; cp++)
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fprintf(stderr, "%02x ", (unsigned char) *cp);
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fprintf(stderr, "\n");
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#endif
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xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
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/* Was it final ACK? then exit */
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if (finished && (opcode == TFTP_ACK))
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goto ret;
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recv_again:
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/* Receive packet */
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/*pfd[0].fd = socket_fd;*/
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pfd[0].events = POLLIN;
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switch (safe_poll(pfd, 1, waittime_ms)) {
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default:
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/*bb_perror_msg("poll"); - done in safe_poll */
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goto ret;
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case 0:
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retries--;
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if (retries == 0) {
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bb_error_msg("timeout");
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goto ret; /* no err packet sent */
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}
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/* exponential backoff with limit */
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waittime_ms += waittime_ms/2;
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if (waittime_ms > TFTP_MAXTIMEOUT_MS) {
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waittime_ms = TFTP_MAXTIMEOUT_MS;
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}
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goto send_again; /* resend last sent pkt */
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case 1:
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if (!our_lsa) {
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/* tftp (not tftpd!) receiving 1st packet */
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our_lsa = ((void*)(ptrdiff_t)-1); /* not NULL */
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len = recvfrom(socket_fd, rbuf, io_bufsize, 0,
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&peer_lsa->u.sa, &peer_lsa->len);
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/* Our first dgram went to port 69
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* but reply may come from different one.
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* Remember and use this new port (and IP) */
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if (len >= 0)
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xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
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} else {
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/* tftpd, or not the very first packet:
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* socket is connect()ed, can just read from it. */
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/* Don't full_read()!
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* This is not TCP, one read == one pkt! */
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len = safe_read(socket_fd, rbuf, io_bufsize);
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}
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if (len < 0) {
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goto send_read_err_pkt;
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}
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if (len < 4) { /* too small? */
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goto recv_again;
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}
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}
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/* Process recv'ed packet */
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opcode = ntohs( ((uint16_t*)rbuf)[0] );
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recv_blk = ntohs( ((uint16_t*)rbuf)[1] );
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#if ENABLE_DEBUG_TFTP
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fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk);
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#endif
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if (opcode == TFTP_ERROR) {
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static const char errcode_str[] =
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"\0"
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"file not found\0"
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"access violation\0"
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"disk full\0"
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"bad operation\0"
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"unknown transfer id\0"
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"file already exists\0"
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"no such user\0"
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"bad option";
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const char *msg = "";
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if (len > 4 && rbuf[4] != '\0') {
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msg = &rbuf[4];
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rbuf[io_bufsize - 1] = '\0'; /* paranoia */
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} else if (recv_blk <= 8) {
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msg = nth_string(errcode_str, recv_blk);
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}
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bb_error_msg("server error: (%u) %s", recv_blk, msg);
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goto ret;
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}
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#if ENABLE_FEATURE_TFTP_BLOCKSIZE
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if (want_option_ack) {
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want_option_ack = 0;
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if (opcode == TFTP_OACK) {
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/* server seems to support options */
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char *res;
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res = tftp_get_blksize(&rbuf[2], len - 2);
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if (res) {
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blksize = tftp_blksize_check(res, blksize);
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if (blksize < 0) {
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error_pkt_reason = ERR_BAD_OPT;
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goto send_err_pkt;
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}
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io_bufsize = blksize + 4;
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/* Send ACK for OACK ("block" no: 0) */
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block_nr = 0;
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continue;
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}
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/* rfc2347:
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* "An option not acknowledged by the server
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* must be ignored by the client and server
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* as if it were never requested." */
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}
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bb_error_msg("server only supports blocksize of 512");
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blksize = TFTP_BLKSIZE_DEFAULT;
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io_bufsize = TFTP_BLKSIZE_DEFAULT + 4;
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}
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#endif
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/* block_nr is already advanced to next block# we expect
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* to get / block# we are about to send next time */
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if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) {
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if (recv_blk == block_nr) {
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int sz = full_write(local_fd, &rbuf[4], len - 4);
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if (sz != len - 4) {
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strcpy(error_pkt_str, bb_msg_write_error);
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error_pkt_reason = ERR_WRITE;
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goto send_err_pkt;
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}
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if (sz != blksize) {
|
|
finished = 1;
|
|
}
|
|
continue; /* send ACK */
|
|
}
|
|
if (recv_blk == (block_nr - 1)) {
|
|
/* Server lost our TFTP_ACK. Resend it */
|
|
block_nr = recv_blk;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (CMD_PUT(option_mask32) && (opcode == TFTP_ACK)) {
|
|
/* did peer ACK our last DATA pkt? */
|
|
if (recv_blk == (uint16_t) (block_nr - 1)) {
|
|
if (finished)
|
|
goto ret;
|
|
continue; /* send next block */
|
|
}
|
|
}
|
|
/* Awww... recv'd packet is not recognized! */
|
|
goto recv_again;
|
|
/* why recv_again? - rfc1123 says:
|
|
* "The sender (i.e., the side originating the DATA packets)
|
|
* must never resend the current DATA packet on receipt
|
|
* of a duplicate ACK".
|
|
* DATA pkts are resent ONLY on timeout.
|
|
* Thus "goto send_again" will ba a bad mistake above.
|
|
* See:
|
|
* http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome
|
|
*/
|
|
} /* end of "while (1)" */
|
|
ret:
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
|
close(local_fd);
|
|
close(socket_fd);
|
|
free(xbuf);
|
|
free(rbuf);
|
|
}
|
|
return finished == 0; /* returns 1 on failure */
|
|
|
|
send_read_err_pkt:
|
|
strcpy(error_pkt_str, bb_msg_read_error);
|
|
send_err_pkt:
|
|
if (error_pkt_str[0])
|
|
bb_error_msg(error_pkt_str);
|
|
error_pkt[1] = TFTP_ERROR;
|
|
xsendto(socket_fd, error_pkt, 4 + 1 + strlen(error_pkt_str),
|
|
&peer_lsa->u.sa, peer_lsa->len);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
#if ENABLE_TFTP
|
|
|
|
int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int tftp_main(int argc ATTRIBUTE_UNUSED, char **argv)
|
|
{
|
|
len_and_sockaddr *peer_lsa;
|
|
const char *local_file = NULL;
|
|
const char *remote_file = NULL;
|
|
const char *blksize_str = "512";
|
|
int blksize;
|
|
int result;
|
|
int port;
|
|
USE_GETPUT(int opt;)
|
|
|
|
INIT_G();
|
|
|
|
/* -p or -g is mandatory, and they are mutually exclusive */
|
|
opt_complementary = "" USE_FEATURE_TFTP_GET("g:") USE_FEATURE_TFTP_PUT("p:")
|
|
USE_GETPUT("g--p:p--g:");
|
|
|
|
USE_GETPUT(opt =) getopt32(argv,
|
|
USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p")
|
|
"l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"),
|
|
&local_file, &remote_file
|
|
USE_FEATURE_TFTP_BLOCKSIZE(, &blksize_str));
|
|
argv += optind;
|
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
|
/* Check if the blksize is valid:
|
|
* RFC2348 says between 8 and 65464 */
|
|
blksize = tftp_blksize_check(blksize_str, 65564);
|
|
if (blksize < 0) {
|
|
//bb_error_msg("bad block size");
|
|
return EXIT_FAILURE;
|
|
}
|
|
#endif
|
|
|
|
if (!local_file)
|
|
local_file = remote_file;
|
|
if (!remote_file)
|
|
remote_file = local_file;
|
|
/* Error if filename or host is not known */
|
|
if (!remote_file || !argv[0])
|
|
bb_show_usage();
|
|
|
|
port = bb_lookup_port(argv[1], "udp", 69);
|
|
peer_lsa = xhost2sockaddr(argv[0], port);
|
|
|
|
#if ENABLE_DEBUG_TFTP
|
|
fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n",
|
|
xmalloc_sockaddr2dotted(&peer_lsa->u.sa),
|
|
remote_file, local_file);
|
|
#endif
|
|
|
|
result = tftp_protocol(
|
|
NULL /* our_lsa*/, peer_lsa,
|
|
local_file, remote_file,
|
|
blksize);
|
|
|
|
if (result != EXIT_SUCCESS && NOT_LONE_DASH(local_file) && CMD_GET(opt)) {
|
|
unlink(local_file);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#endif /* ENABLE_TFTP */
|
|
|
|
#if ENABLE_TFTPD
|
|
|
|
/* TODO: libbb candidate? */
|
|
static len_and_sockaddr *get_sock_lsa(int s)
|
|
{
|
|
len_and_sockaddr *lsa;
|
|
socklen_t len = 0;
|
|
|
|
if (getsockname(s, NULL, &len) != 0)
|
|
return NULL;
|
|
lsa = xzalloc(LSA_LEN_SIZE + len);
|
|
lsa->len = len;
|
|
getsockname(s, &lsa->u.sa, &lsa->len);
|
|
return lsa;
|
|
}
|
|
|
|
int tftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int tftpd_main(int argc ATTRIBUTE_UNUSED, char **argv)
|
|
{
|
|
len_and_sockaddr *our_lsa;
|
|
len_and_sockaddr *peer_lsa;
|
|
char *local_file, *mode;
|
|
const char *error_msg;
|
|
int opt, result, opcode;
|
|
int local_fd = local_fd; /* for compiler */
|
|
int blksize = blksize;
|
|
USE_GETPUT(int cmd = cmd;)
|
|
|
|
INIT_G();
|
|
|
|
our_lsa = get_sock_lsa(STDIN_FILENO);
|
|
if (!our_lsa)
|
|
bb_perror_msg_and_die("stdin is not a socket");
|
|
peer_lsa = xzalloc(LSA_LEN_SIZE + our_lsa->len);
|
|
peer_lsa->len = our_lsa->len;
|
|
|
|
/* Shifting to not collide with TFTP_OPTs */
|
|
opt = option_mask32 = TFTPD_OPT | (getopt32(argv, "rcu:", &user_opt) << 8);
|
|
argv += optind;
|
|
if (argv[0])
|
|
xchdir(argv[0]);
|
|
|
|
result = recv_from_to(STDIN_FILENO, block_buf, sizeof(block_buf),
|
|
0 /* flags */,
|
|
&peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len);
|
|
|
|
error_msg = "malformed packet";
|
|
opcode = ntohs(*(uint16_t*)block_buf);
|
|
if (result < 4 || result >= sizeof(block_buf)
|
|
|| block_buf[result-1] != '\0'
|
|
|| (USE_FEATURE_TFTP_GET(opcode != TFTP_RRQ) /* not download */
|
|
USE_GETPUT(&&)
|
|
USE_FEATURE_TFTP_GET(opcode != TFTP_WRQ) /* not upload */
|
|
)
|
|
) {
|
|
goto err;
|
|
}
|
|
local_file = block_buf + 2;
|
|
if (local_file[0] == '.' || strstr(local_file, "/.")) {
|
|
error_msg = "dot in local_file";
|
|
goto err;
|
|
}
|
|
mode = local_file + strlen(local_file) + 1;
|
|
if (mode >= block_buf + result || strcmp(mode, "octet") != 0) {
|
|
goto err;
|
|
}
|
|
blksize = TFTP_BLKSIZE_DEFAULT;
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
|
{
|
|
char *res;
|
|
char *opt_str = mode + sizeof("octet");
|
|
int opt_len = block_buf + result - opt_str;
|
|
if (opt_len > 0) {
|
|
res = tftp_get_blksize(opt_str, opt_len);
|
|
if (res) {
|
|
blksize = tftp_blksize_check(res, 65564);
|
|
if (blksize < 0) {
|
|
error_pkt_reason = ERR_BAD_OPT;
|
|
/* will just send error pkt */
|
|
goto do_proto;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (!ENABLE_FEATURE_TFTP_PUT || opcode == TFTP_WRQ) {
|
|
if (opt & TFTPD_OPT_r) {
|
|
/* This would mean "disk full" - not true */
|
|
/*error_pkt_reason = ERR_WRITE;*/
|
|
error_msg = bb_msg_write_error;
|
|
goto err;
|
|
}
|
|
USE_GETPUT(option_mask32 |= TFTP_OPT_GET;) /* will receive file's data */
|
|
} else {
|
|
USE_GETPUT(option_mask32 |= TFTP_OPT_PUT;) /* will send file's data */
|
|
}
|
|
|
|
close(STDIN_FILENO); /* close old, possibly wildcard socket */
|
|
/* tftp_protocol() will create new one, bound to particular local IP */
|
|
|
|
/* NB: if error_pkt_str or error_pkt_reason is set up,
|
|
* tftp_protocol() just sends one error pkt and returns */
|
|
do_proto:
|
|
result = tftp_protocol(
|
|
our_lsa, peer_lsa,
|
|
local_file, USE_TFTP(NULL /*remote_file*/,)
|
|
blksize
|
|
);
|
|
|
|
return result;
|
|
err:
|
|
strcpy(error_pkt_str, error_msg);
|
|
goto do_proto;
|
|
}
|
|
|
|
#endif /* ENABLE_TFTPD */
|
|
|
|
#endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */
|