2006-04-12 23:25:51 +05:30
|
|
|
/* vi: set sw=4 ts=4: */
|
|
|
|
/* -------------------------------------------------------------------------
|
|
|
|
* tftp.c
|
|
|
|
*
|
2008-03-17 14:40:39 +05:30
|
|
|
* A simple tftp client/server for busybox.
|
2006-04-12 23:25:51 +05:30
|
|
|
* Tries to follow RFC1350.
|
|
|
|
* Only "octet" mode supported.
|
|
|
|
* Optional blocksize negotiation (RFC2347 + RFC2348)
|
|
|
|
*
|
|
|
|
* Copyright (C) 2001 Magnus Damm <damm@opensource.se>
|
|
|
|
*
|
|
|
|
* Parts of the code based on:
|
|
|
|
*
|
|
|
|
* atftp: Copyright (C) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca>
|
|
|
|
* and Remi Lefebvre <remi@debian.org>
|
|
|
|
*
|
|
|
|
* utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de>
|
|
|
|
*
|
2008-03-18 05:41:46 +05:30
|
|
|
* tftpd added by Denys Vlasenko & Vladimir Dronnikov
|
2008-03-17 14:40:39 +05:30
|
|
|
*
|
2006-04-12 23:25:51 +05:30
|
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
|
|
* ------------------------------------------------------------------------- */
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2007-05-27 00:30:18 +05:30
|
|
|
#include "libbb.h"
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2007-01-20 22:24:19 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
|
|
|
|
|
2008-03-21 23:59:01 +05:30
|
|
|
#define TFTP_BLKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
|
|
|
|
#define TFTP_BLKSIZE_DEFAULT_STR "512"
|
|
|
|
#define TFTP_TIMEOUT_MS 50
|
|
|
|
#define TFTP_MAXTIMEOUT_MS 2000
|
|
|
|
#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2006-06-10 19:45:03 +05:30
|
|
|
/* opcodes we support */
|
2001-10-05 10:10:37 +05:30
|
|
|
#define TFTP_RRQ 1
|
|
|
|
#define TFTP_WRQ 2
|
|
|
|
#define TFTP_DATA 3
|
|
|
|
#define TFTP_ACK 4
|
|
|
|
#define TFTP_ERROR 5
|
|
|
|
#define TFTP_OACK 6
|
|
|
|
|
2008-06-16 12:42:19 +05:30
|
|
|
/* error codes sent over network (we use only 0, 1, 3 and 8) */
|
2008-03-19 15:13:50 +05:30
|
|
|
/* generic (error message is included in the packet) */
|
2008-03-19 10:30:05 +05:30
|
|
|
#define ERR_UNSPEC 0
|
|
|
|
#define ERR_NOFILE 1
|
|
|
|
#define ERR_ACCESS 2
|
2008-03-19 15:13:50 +05:30
|
|
|
/* disk full or allocation exceeded */
|
2008-03-19 10:30:05 +05:30
|
|
|
#define ERR_WRITE 3
|
|
|
|
#define ERR_OP 4
|
|
|
|
#define ERR_BAD_ID 5
|
|
|
|
#define ERR_EXIST 6
|
|
|
|
#define ERR_BAD_USER 7
|
|
|
|
#define ERR_BAD_OPT 8
|
|
|
|
|
2008-03-19 18:37:00 +05:30
|
|
|
/* masks coming from getopt32 */
|
|
|
|
enum {
|
|
|
|
TFTP_OPT_GET = (1 << 0),
|
|
|
|
TFTP_OPT_PUT = (1 << 1),
|
|
|
|
/* pseudo option: if set, it's tftpd */
|
|
|
|
TFTPD_OPT = (1 << 7) * ENABLE_TFTPD,
|
|
|
|
TFTPD_OPT_r = (1 << 8) * ENABLE_TFTPD,
|
|
|
|
TFTPD_OPT_c = (1 << 9) * ENABLE_TFTPD,
|
|
|
|
TFTPD_OPT_u = (1 << 10) * ENABLE_TFTPD,
|
|
|
|
};
|
|
|
|
|
2007-01-11 22:20:23 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
|
2007-05-09 18:20:08 +05:30
|
|
|
#define USE_GETPUT(...)
|
2007-01-11 22:20:23 +05:30
|
|
|
#define CMD_GET(cmd) 1
|
|
|
|
#define CMD_PUT(cmd) 0
|
|
|
|
#elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
|
2007-05-09 18:20:08 +05:30
|
|
|
#define USE_GETPUT(...)
|
2007-01-11 22:20:23 +05:30
|
|
|
#define CMD_GET(cmd) 0
|
|
|
|
#define CMD_PUT(cmd) 1
|
2005-10-17 16:17:19 +05:30
|
|
|
#else
|
2007-05-09 18:20:08 +05:30
|
|
|
#define USE_GETPUT(...) __VA_ARGS__
|
2008-03-19 18:37:00 +05:30
|
|
|
#define CMD_GET(cmd) ((cmd) & TFTP_OPT_GET)
|
|
|
|
#define CMD_PUT(cmd) ((cmd) & TFTP_OPT_PUT)
|
2005-10-17 16:17:19 +05:30
|
|
|
#endif
|
2007-01-11 22:20:23 +05:30
|
|
|
/* NB: in the code below
|
2007-05-09 04:42:21 +05:30
|
|
|
* CMD_GET(cmd) and CMD_PUT(cmd) are mutually exclusive
|
2007-01-11 22:20:23 +05:30
|
|
|
*/
|
2005-10-17 16:17:19 +05:30
|
|
|
|
2008-03-19 10:30:05 +05:30
|
|
|
|
|
|
|
struct globals {
|
|
|
|
/* u16 TFTP_ERROR; u16 reason; both network-endian, then error text: */
|
|
|
|
uint8_t error_pkt[4 + 32];
|
2008-03-19 18:37:00 +05:30
|
|
|
char *user_opt;
|
2008-03-19 15:13:50 +05:30
|
|
|
/* used in tftpd_main(), a bit big for stack: */
|
2008-03-19 10:30:05 +05:30
|
|
|
char block_buf[TFTP_BLKSIZE_DEFAULT];
|
|
|
|
};
|
|
|
|
#define G (*(struct globals*)&bb_common_bufsiz1)
|
|
|
|
#define block_buf (G.block_buf )
|
2008-03-19 18:37:00 +05:30
|
|
|
#define user_opt (G.user_opt )
|
2008-03-19 10:30:05 +05:30
|
|
|
#define error_pkt (G.error_pkt )
|
2008-06-25 15:23:17 +05:30
|
|
|
#define INIT_G() do { } while (0)
|
2008-03-19 10:30:05 +05:30
|
|
|
|
|
|
|
#define error_pkt_reason (error_pkt[3])
|
|
|
|
#define error_pkt_str (error_pkt + 4)
|
2008-03-18 06:43:11 +05:30
|
|
|
|
2001-08-20 23:17:49 +05:30
|
|
|
|
2006-11-21 15:45:25 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2008-03-19 10:30:05 +05:30
|
|
|
static int tftp_blksize_check(const char *blksize_str, int maxsize)
|
2001-10-05 10:10:37 +05:30
|
|
|
{
|
2008-03-19 10:30:05 +05:30
|
|
|
/* Check if the blksize is valid:
|
2001-10-05 10:10:37 +05:30
|
|
|
* RFC2348 says between 8 and 65464,
|
|
|
|
* but our implementation makes it impossible
|
2008-03-19 10:30:05 +05:30
|
|
|
* to use blksizes smaller than 22 octets. */
|
|
|
|
unsigned blksize = bb_strtou(blksize_str, NULL, 10);
|
|
|
|
if (errno
|
|
|
|
|| (blksize < 24) || (blksize > maxsize)
|
2007-01-11 22:20:23 +05:30
|
|
|
) {
|
2008-03-19 10:30:05 +05:30
|
|
|
bb_error_msg("bad blocksize '%s'", blksize_str);
|
|
|
|
return -1;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
2008-03-19 10:30:05 +05:30
|
|
|
#if ENABLE_DEBUG_TFTP
|
|
|
|
bb_error_msg("using blksize %u", blksize);
|
|
|
|
#endif
|
|
|
|
return blksize;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
|
|
|
|
2008-06-16 12:42:19 +05:30
|
|
|
static char *tftp_get_option(const char *option, char *buf, int len)
|
2001-10-05 10:10:37 +05:30
|
|
|
{
|
2006-01-25 05:38:53 +05:30
|
|
|
int opt_val = 0;
|
2001-10-05 10:10:37 +05:30
|
|
|
int opt_found = 0;
|
|
|
|
int k;
|
2004-03-15 13:59:22 +05:30
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
/* buf points to:
|
|
|
|
* "opt_name<NUL>opt_val<NUL>opt_name2<NUL>opt_val2<NUL>..." */
|
|
|
|
|
2001-10-05 10:10:37 +05:30
|
|
|
while (len > 0) {
|
2008-03-17 14:40:39 +05:30
|
|
|
/* Make sure options are terminated correctly */
|
2006-06-10 19:45:03 +05:30
|
|
|
for (k = 0; k < len; k++) {
|
|
|
|
if (buf[k] == '\0') {
|
2007-05-09 04:42:21 +05:30
|
|
|
goto nul_found;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
return NULL;
|
|
|
|
nul_found:
|
2008-03-17 14:40:39 +05:30
|
|
|
if (opt_val == 0) { /* it's "name" part */
|
2001-10-05 10:10:37 +05:30
|
|
|
if (strcasecmp(buf, option) == 0) {
|
2006-06-10 19:45:03 +05:30
|
|
|
opt_found = 1;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
} else if (opt_found) {
|
|
|
|
return buf;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
2004-03-15 13:59:22 +05:30
|
|
|
|
2001-10-05 10:10:37 +05:30
|
|
|
k++;
|
|
|
|
buf += k;
|
|
|
|
len -= k;
|
|
|
|
opt_val ^= 1;
|
|
|
|
}
|
2004-03-15 13:59:22 +05:30
|
|
|
|
2001-10-05 10:10:37 +05:30
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
static int tftp_protocol(
|
|
|
|
len_and_sockaddr *our_lsa,
|
2007-02-08 04:50:32 +05:30
|
|
|
len_and_sockaddr *peer_lsa,
|
2008-06-16 12:42:19 +05:30
|
|
|
const char *local_file
|
|
|
|
USE_TFTP(, const char *remote_file)
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(USE_TFTPD(, void *tsize))
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(, int blksize))
|
2001-03-03 00:38:50 +05:30
|
|
|
{
|
2008-03-17 14:40:39 +05:30
|
|
|
#if !ENABLE_TFTP
|
|
|
|
#define remote_file NULL
|
|
|
|
#endif
|
2008-06-16 12:42:19 +05:30
|
|
|
#if !(ENABLE_FEATURE_TFTP_BLOCKSIZE && ENABLE_TFTPD)
|
|
|
|
#define tsize NULL
|
|
|
|
#endif
|
|
|
|
#if !ENABLE_FEATURE_TFTP_BLOCKSIZE
|
|
|
|
enum { blksize = TFTP_BLKSIZE_DEFAULT };
|
|
|
|
#endif
|
|
|
|
|
2007-09-07 19:13:28 +05:30
|
|
|
struct pollfd pfd[1];
|
2008-03-17 14:40:39 +05:30
|
|
|
#define socket_fd (pfd[0].fd)
|
2006-06-10 20:02:56 +05:30
|
|
|
int len;
|
2007-05-09 04:42:21 +05:30
|
|
|
int send_len;
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(smallint want_option_ack = 0;)
|
|
|
|
smallint finished = 0;
|
|
|
|
uint16_t opcode;
|
2008-03-17 14:40:39 +05:30
|
|
|
uint16_t block_nr;
|
2007-05-09 04:42:21 +05:30
|
|
|
uint16_t recv_blk;
|
2008-03-19 18:37:00 +05:30
|
|
|
int open_mode, local_fd;
|
2007-09-07 19:13:28 +05:30
|
|
|
int retries, waittime_ms;
|
2008-03-19 10:30:05 +05:30
|
|
|
int io_bufsize = blksize + 4;
|
2008-03-21 23:59:01 +05:30
|
|
|
char *cp;
|
2001-11-10 16:46:39 +05:30
|
|
|
/* Can't use RESERVE_CONFIG_BUFFER here since the allocation
|
|
|
|
* size varies meaning BUFFERS_GO_ON_STACK would fail */
|
2006-12-17 06:44:08 +05:30
|
|
|
/* We must keep the transmit and receive buffers seperate */
|
|
|
|
/* In case we rcv a garbage pkt and we need to rexmit the last pkt */
|
2008-03-19 10:30:05 +05:30
|
|
|
char *xbuf = xmalloc(io_bufsize);
|
|
|
|
char *rbuf = xmalloc(io_bufsize);
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
socket_fd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0);
|
|
|
|
setsockopt_reuseaddr(socket_fd);
|
2007-01-12 16:05:23 +05:30
|
|
|
|
2008-03-18 05:41:46 +05:30
|
|
|
block_nr = 1;
|
2008-03-21 23:59:01 +05:30
|
|
|
cp = xbuf + 2;
|
2008-03-19 18:54:13 +05:30
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
if (!ENABLE_TFTP || our_lsa) {
|
|
|
|
/* tftpd */
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
/* Create a socket which is:
|
|
|
|
* 1. bound to IP:port peer sent 1st datagram to,
|
|
|
|
* 2. connected to peer's IP:port
|
|
|
|
* This way we will answer from the IP:port peer
|
|
|
|
* expects, will not get any other packets on
|
|
|
|
* the socket, and also plain read/write will work. */
|
|
|
|
xbind(socket_fd, &our_lsa->u.sa, our_lsa->len);
|
|
|
|
xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2008-03-19 10:30:05 +05:30
|
|
|
/* Is there an error already? Send pkt and bail out */
|
|
|
|
if (error_pkt_reason || error_pkt_str[0])
|
|
|
|
goto send_err_pkt;
|
|
|
|
|
2008-03-19 18:37:00 +05:30
|
|
|
if (CMD_GET(option_mask32)) {
|
2008-03-18 05:41:46 +05:30
|
|
|
/* it's upload - we must ACK 1st packet (with filename)
|
|
|
|
* as if it's "block 0" */
|
|
|
|
block_nr = 0;
|
|
|
|
}
|
|
|
|
|
2008-03-19 18:54:13 +05:30
|
|
|
if (user_opt) {
|
|
|
|
struct passwd *pw = getpwnam(user_opt);
|
|
|
|
if (!pw)
|
2008-07-21 20:11:33 +05:30
|
|
|
bb_error_msg_and_die("unknown user %s", user_opt);
|
2008-03-19 18:54:13 +05:30
|
|
|
change_identity(pw); /* initgroups, setgid, setuid */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Open local file (must be after changing user) */
|
|
|
|
if (CMD_PUT(option_mask32)) {
|
|
|
|
open_mode = O_RDONLY;
|
|
|
|
} else {
|
|
|
|
open_mode = O_WRONLY | O_TRUNC | O_CREAT;
|
|
|
|
#if ENABLE_TFTPD
|
|
|
|
if ((option_mask32 & (TFTPD_OPT+TFTPD_OPT_c)) == TFTPD_OPT) {
|
|
|
|
/* tftpd without -c */
|
|
|
|
open_mode = O_WRONLY | O_TRUNC;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
if (!(option_mask32 & TFTPD_OPT)) {
|
|
|
|
local_fd = CMD_GET(option_mask32) ? STDOUT_FILENO : STDIN_FILENO;
|
|
|
|
if (NOT_LONE_DASH(local_file))
|
|
|
|
local_fd = xopen(local_file, open_mode);
|
|
|
|
} else {
|
2008-06-16 12:42:19 +05:30
|
|
|
local_fd = open(local_file, open_mode);
|
2008-03-19 18:54:13 +05:30
|
|
|
if (local_fd < 0) {
|
2008-06-16 12:42:19 +05:30
|
|
|
error_pkt_reason = ERR_NOFILE;
|
2008-05-19 03:58:26 +05:30
|
|
|
strcpy((char*)error_pkt_str, "can't open file");
|
2008-03-19 18:54:13 +05:30
|
|
|
goto send_err_pkt;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!ENABLE_TFTP || our_lsa) {
|
2008-06-16 13:02:40 +05:30
|
|
|
/* gcc 4.3.1 would NOT optimize it out as it should! */
|
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
2008-06-16 12:42:19 +05:30
|
|
|
if (blksize != TFTP_BLKSIZE_DEFAULT || tsize) {
|
2008-03-21 23:59:01 +05:30
|
|
|
/* Create and send OACK packet. */
|
|
|
|
/* For the download case, block_nr is still 1 -
|
|
|
|
* we expect 1st ACK from peer to be for (block_nr-1),
|
|
|
|
* that is, for "block 0" which is our OACK pkt */
|
|
|
|
opcode = TFTP_OACK;
|
2008-03-17 14:40:39 +05:30
|
|
|
goto add_blksize_opt;
|
|
|
|
}
|
2008-06-16 13:02:40 +05:30
|
|
|
#endif
|
2008-06-16 12:42:19 +05:30
|
|
|
} else {
|
|
|
|
/* Removing it, or using if() statement instead of #if may lead to
|
2008-03-21 23:59:01 +05:30
|
|
|
* "warning: null argument where non-null required": */
|
|
|
|
#if ENABLE_TFTP
|
2008-03-17 14:40:39 +05:30
|
|
|
/* tftp */
|
|
|
|
|
|
|
|
/* We can't (and don't really need to) bind the socket:
|
|
|
|
* we don't know from which local IP datagrams will be sent,
|
|
|
|
* but kernel will pick the same IP every time (unless routing
|
|
|
|
* table is changed), thus peer will see dgrams consistently
|
|
|
|
* coming from the same IP.
|
|
|
|
* We would like to connect the socket, but since peer's
|
|
|
|
* UDP code can be less perfect than ours, _peer's_ IP:port
|
|
|
|
* in replies may differ from IP:port we used to send
|
|
|
|
* our first packet. We can connect() only when we get
|
|
|
|
* first reply. */
|
|
|
|
|
|
|
|
/* build opcode */
|
|
|
|
opcode = TFTP_WRQ;
|
2008-03-19 18:37:00 +05:30
|
|
|
if (CMD_GET(option_mask32)) {
|
2008-03-17 14:40:39 +05:30
|
|
|
opcode = TFTP_RRQ;
|
|
|
|
}
|
|
|
|
/* add filename and mode */
|
|
|
|
/* fill in packet if the filename fits into xbuf */
|
|
|
|
len = strlen(remote_file) + 1;
|
2008-03-19 10:30:05 +05:30
|
|
|
if (2 + len + sizeof("octet") >= io_bufsize) {
|
2007-05-09 04:42:21 +05:30
|
|
|
bb_error_msg("remote filename is too long");
|
|
|
|
goto ret;
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
2008-03-17 14:40:39 +05:30
|
|
|
strcpy(cp, remote_file);
|
|
|
|
cp += len;
|
|
|
|
/* add "mode" part of the package */
|
|
|
|
strcpy(cp, "octet");
|
|
|
|
cp += sizeof("octet");
|
|
|
|
|
2008-06-16 13:02:40 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
2008-03-21 23:59:01 +05:30
|
|
|
if (blksize == TFTP_BLKSIZE_DEFAULT)
|
|
|
|
goto send_pkt;
|
|
|
|
|
|
|
|
/* Non-standard blocksize: add option to pkt */
|
|
|
|
if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN")) {
|
|
|
|
bb_error_msg("remote filename is too long");
|
|
|
|
goto ret;
|
2008-03-17 14:40:39 +05:30
|
|
|
}
|
2008-06-16 13:02:40 +05:30
|
|
|
want_option_ack = 1;
|
|
|
|
#endif
|
2008-03-21 23:59:01 +05:30
|
|
|
#endif /* ENABLE_TFTP */
|
|
|
|
|
2008-06-16 13:02:40 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
2008-03-21 23:59:01 +05:30
|
|
|
add_blksize_opt:
|
2008-06-16 12:42:19 +05:30
|
|
|
#if ENABLE_TFTPD
|
|
|
|
if (tsize) {
|
|
|
|
struct stat st;
|
|
|
|
/* add "tsize", <nul>, size, <nul> */
|
|
|
|
strcpy(cp, "tsize");
|
|
|
|
cp += sizeof("tsize");
|
|
|
|
fstat(local_fd, &st);
|
|
|
|
cp += snprintf(cp, 10, "%u", (int) st.st_size) + 1;
|
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
#endif
|
2008-06-16 12:42:19 +05:30
|
|
|
if (blksize != TFTP_BLKSIZE_DEFAULT) {
|
|
|
|
/* add "blksize", <nul>, blksize, <nul> */
|
|
|
|
strcpy(cp, "blksize");
|
|
|
|
cp += sizeof("blksize");
|
|
|
|
cp += snprintf(cp, 6, "%d", blksize) + 1;
|
|
|
|
}
|
2008-06-16 13:02:40 +05:30
|
|
|
#endif
|
2008-03-17 14:40:39 +05:30
|
|
|
/* First packet is built, so skip packet generation */
|
|
|
|
goto send_pkt;
|
|
|
|
}
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2007-05-09 18:20:08 +05:30
|
|
|
/* Using mostly goto's - continue/break will be less clear
|
|
|
|
* in where we actually jump to */
|
2007-05-09 04:42:21 +05:30
|
|
|
while (1) {
|
|
|
|
/* Build ACK or DATA */
|
|
|
|
cp = xbuf + 2;
|
|
|
|
*((uint16_t*)cp) = htons(block_nr);
|
|
|
|
cp += 2;
|
|
|
|
block_nr++;
|
|
|
|
opcode = TFTP_ACK;
|
2008-03-19 18:37:00 +05:30
|
|
|
if (CMD_PUT(option_mask32)) {
|
2007-05-09 04:42:21 +05:30
|
|
|
opcode = TFTP_DATA;
|
2008-03-19 10:30:05 +05:30
|
|
|
len = full_read(local_fd, cp, blksize);
|
2007-05-09 04:42:21 +05:30
|
|
|
if (len < 0) {
|
2008-03-19 10:30:05 +05:30
|
|
|
goto send_read_err_pkt;
|
2007-05-09 04:42:21 +05:30
|
|
|
}
|
2008-03-19 10:30:05 +05:30
|
|
|
if (len != blksize) {
|
2007-05-09 04:42:21 +05:30
|
|
|
finished = 1;
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
cp += len;
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
send_pkt:
|
|
|
|
/* Send packet */
|
|
|
|
*((uint16_t*)xbuf) = htons(opcode); /* fill in opcode part */
|
2007-05-09 18:20:08 +05:30
|
|
|
send_len = cp - xbuf;
|
|
|
|
/* NB: send_len value is preserved in code below
|
|
|
|
* for potential resend */
|
2007-09-06 23:22:22 +05:30
|
|
|
|
|
|
|
retries = TFTP_NUM_RETRIES; /* re-initialize */
|
2007-09-07 19:13:28 +05:30
|
|
|
waittime_ms = TFTP_TIMEOUT_MS;
|
2007-09-06 23:22:22 +05:30
|
|
|
|
2007-05-09 04:42:21 +05:30
|
|
|
send_again:
|
2006-11-21 15:45:25 +05:30
|
|
|
#if ENABLE_DEBUG_TFTP
|
2007-05-09 18:20:08 +05:30
|
|
|
fprintf(stderr, "sending %u bytes\n", send_len);
|
|
|
|
for (cp = xbuf; cp < &xbuf[send_len]; cp++)
|
|
|
|
fprintf(stderr, "%02x ", (unsigned char) *cp);
|
|
|
|
fprintf(stderr, "\n");
|
2001-08-20 23:17:49 +05:30
|
|
|
#endif
|
2008-03-17 14:40:39 +05:30
|
|
|
xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
|
2007-05-09 18:20:08 +05:30
|
|
|
/* Was it final ACK? then exit */
|
|
|
|
if (finished && (opcode == TFTP_ACK))
|
|
|
|
goto ret;
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2007-01-12 20:27:37 +05:30
|
|
|
recv_again:
|
2007-05-09 18:20:08 +05:30
|
|
|
/* Receive packet */
|
2008-03-17 14:40:39 +05:30
|
|
|
/*pfd[0].fd = socket_fd;*/
|
2007-09-07 19:13:28 +05:30
|
|
|
pfd[0].events = POLLIN;
|
2007-09-27 15:39:59 +05:30
|
|
|
switch (safe_poll(pfd, 1, waittime_ms)) {
|
2008-03-19 10:30:05 +05:30
|
|
|
default:
|
|
|
|
/*bb_perror_msg("poll"); - done in safe_poll */
|
|
|
|
goto ret;
|
|
|
|
case 0:
|
|
|
|
retries--;
|
|
|
|
if (retries == 0) {
|
|
|
|
bb_error_msg("timeout");
|
|
|
|
goto ret; /* no err packet sent */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* exponential backoff with limit */
|
|
|
|
waittime_ms += waittime_ms/2;
|
|
|
|
if (waittime_ms > TFTP_MAXTIMEOUT_MS) {
|
|
|
|
waittime_ms = TFTP_MAXTIMEOUT_MS;
|
|
|
|
}
|
|
|
|
|
|
|
|
goto send_again; /* resend last sent pkt */
|
2007-05-09 18:20:08 +05:30
|
|
|
case 1:
|
2008-03-17 14:40:39 +05:30
|
|
|
if (!our_lsa) {
|
|
|
|
/* tftp (not tftpd!) receiving 1st packet */
|
|
|
|
our_lsa = ((void*)(ptrdiff_t)-1); /* not NULL */
|
2008-03-19 10:30:05 +05:30
|
|
|
len = recvfrom(socket_fd, rbuf, io_bufsize, 0,
|
2008-03-17 14:40:39 +05:30
|
|
|
&peer_lsa->u.sa, &peer_lsa->len);
|
|
|
|
/* Our first dgram went to port 69
|
|
|
|
* but reply may come from different one.
|
|
|
|
* Remember and use this new port (and IP) */
|
|
|
|
if (len >= 0)
|
|
|
|
xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
|
|
|
|
} else {
|
|
|
|
/* tftpd, or not the very first packet:
|
|
|
|
* socket is connect()ed, can just read from it. */
|
2008-03-19 10:30:05 +05:30
|
|
|
/* Don't full_read()!
|
|
|
|
* This is not TCP, one read == one pkt! */
|
|
|
|
len = safe_read(socket_fd, rbuf, io_bufsize);
|
2008-03-17 14:40:39 +05:30
|
|
|
}
|
2007-05-09 18:20:08 +05:30
|
|
|
if (len < 0) {
|
2008-03-19 10:30:05 +05:30
|
|
|
goto send_read_err_pkt;
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
2008-03-19 10:30:05 +05:30
|
|
|
if (len < 4) { /* too small? */
|
2008-03-18 05:41:46 +05:30
|
|
|
goto recv_again;
|
2007-05-09 18:20:08 +05:30
|
|
|
}
|
|
|
|
}
|
2008-03-19 10:30:05 +05:30
|
|
|
|
2007-05-09 04:42:21 +05:30
|
|
|
/* Process recv'ed packet */
|
2007-01-11 22:20:23 +05:30
|
|
|
opcode = ntohs( ((uint16_t*)rbuf)[0] );
|
2007-05-09 04:42:21 +05:30
|
|
|
recv_blk = ntohs( ((uint16_t*)rbuf)[1] );
|
2006-11-21 15:45:25 +05:30
|
|
|
#if ENABLE_DEBUG_TFTP
|
2007-05-09 04:42:21 +05:30
|
|
|
fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk);
|
2001-08-20 23:17:49 +05:30
|
|
|
#endif
|
2001-10-05 10:10:37 +05:30
|
|
|
if (opcode == TFTP_ERROR) {
|
2008-06-16 12:42:19 +05:30
|
|
|
static const char errcode_str[] ALIGN1 =
|
2008-03-19 10:30:05 +05:30
|
|
|
"\0"
|
|
|
|
"file not found\0"
|
|
|
|
"access violation\0"
|
|
|
|
"disk full\0"
|
|
|
|
"bad operation\0"
|
|
|
|
"unknown transfer id\0"
|
|
|
|
"file already exists\0"
|
|
|
|
"no such user\0"
|
|
|
|
"bad option";
|
2007-06-25 16:25:35 +05:30
|
|
|
|
2007-05-09 04:42:21 +05:30
|
|
|
const char *msg = "";
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2008-03-18 06:43:11 +05:30
|
|
|
if (len > 4 && rbuf[4] != '\0') {
|
2006-12-17 06:44:08 +05:30
|
|
|
msg = &rbuf[4];
|
2008-03-19 10:30:05 +05:30
|
|
|
rbuf[io_bufsize - 1] = '\0'; /* paranoia */
|
|
|
|
} else if (recv_blk <= 8) {
|
|
|
|
msg = nth_string(errcode_str, recv_blk);
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
bb_error_msg("server error: (%u) %s", recv_blk, msg);
|
|
|
|
goto ret;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
|
2006-11-21 15:45:25 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
2001-10-05 10:10:37 +05:30
|
|
|
if (want_option_ack) {
|
2006-06-10 19:45:03 +05:30
|
|
|
want_option_ack = 0;
|
|
|
|
if (opcode == TFTP_OACK) {
|
|
|
|
/* server seems to support options */
|
|
|
|
char *res;
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2008-06-16 12:42:19 +05:30
|
|
|
res = tftp_get_option("blksize", &rbuf[2], len - 2);
|
2006-06-10 19:45:03 +05:30
|
|
|
if (res) {
|
2008-03-19 10:30:05 +05:30
|
|
|
blksize = tftp_blksize_check(res, blksize);
|
|
|
|
if (blksize < 0) {
|
|
|
|
error_pkt_reason = ERR_BAD_OPT;
|
|
|
|
goto send_err_pkt;
|
2007-05-09 04:42:21 +05:30
|
|
|
}
|
2008-03-19 10:30:05 +05:30
|
|
|
io_bufsize = blksize + 4;
|
2007-05-09 18:20:08 +05:30
|
|
|
/* Send ACK for OACK ("block" no: 0) */
|
|
|
|
block_nr = 0;
|
2007-05-09 04:42:21 +05:30
|
|
|
continue;
|
2006-06-10 19:45:03 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
/* rfc2347:
|
|
|
|
* "An option not acknowledged by the server
|
|
|
|
* must be ignored by the client and server
|
|
|
|
* as if it were never requested." */
|
2006-06-10 19:45:03 +05:30
|
|
|
}
|
2008-03-19 10:30:05 +05:30
|
|
|
bb_error_msg("server only supports blocksize of 512");
|
|
|
|
blksize = TFTP_BLKSIZE_DEFAULT;
|
|
|
|
io_bufsize = TFTP_BLKSIZE_DEFAULT + 4;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
|
|
|
#endif
|
2007-05-09 04:42:21 +05:30
|
|
|
/* block_nr is already advanced to next block# we expect
|
|
|
|
* to get / block# we are about to send next time */
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2008-03-19 18:37:00 +05:30
|
|
|
if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) {
|
2007-05-09 04:42:21 +05:30
|
|
|
if (recv_blk == block_nr) {
|
2008-03-19 15:13:50 +05:30
|
|
|
int sz = full_write(local_fd, &rbuf[4], len - 4);
|
|
|
|
if (sz != len - 4) {
|
2008-05-19 03:58:26 +05:30
|
|
|
strcpy((char*)error_pkt_str, bb_msg_write_error);
|
2008-03-19 10:30:05 +05:30
|
|
|
error_pkt_reason = ERR_WRITE;
|
|
|
|
goto send_err_pkt;
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
2008-03-19 15:13:50 +05:30
|
|
|
if (sz != blksize) {
|
2007-05-09 04:42:21 +05:30
|
|
|
finished = 1;
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
continue; /* send ACK */
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
if (recv_blk == (block_nr - 1)) {
|
2005-07-21 01:19:15 +05:30
|
|
|
/* Server lost our TFTP_ACK. Resend it */
|
2007-05-09 04:42:21 +05:30
|
|
|
block_nr = recv_blk;
|
2005-07-21 01:19:15 +05:30
|
|
|
continue;
|
2007-05-30 05:59:55 +05:30
|
|
|
}
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
|
|
|
|
2008-03-19 18:37:00 +05:30
|
|
|
if (CMD_PUT(option_mask32) && (opcode == TFTP_ACK)) {
|
2008-03-17 14:40:39 +05:30
|
|
|
/* did peer ACK our last DATA pkt? */
|
2007-05-09 04:42:21 +05:30
|
|
|
if (recv_blk == (uint16_t) (block_nr - 1)) {
|
|
|
|
if (finished)
|
|
|
|
goto ret;
|
|
|
|
continue; /* send next block */
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
/* 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
|
|
|
|
*/
|
2008-03-17 14:40:39 +05:30
|
|
|
} /* end of "while (1)" */
|
2007-05-09 04:42:21 +05:30
|
|
|
ret:
|
2007-01-12 20:27:37 +05:30
|
|
|
if (ENABLE_FEATURE_CLEAN_UP) {
|
2008-03-19 18:37:00 +05:30
|
|
|
close(local_fd);
|
2008-03-17 14:40:39 +05:30
|
|
|
close(socket_fd);
|
2007-01-12 20:27:37 +05:30
|
|
|
free(xbuf);
|
|
|
|
free(rbuf);
|
|
|
|
}
|
2007-05-09 04:42:21 +05:30
|
|
|
return finished == 0; /* returns 1 on failure */
|
2008-03-19 10:30:05 +05:30
|
|
|
|
|
|
|
send_read_err_pkt:
|
2008-05-19 03:58:26 +05:30
|
|
|
strcpy((char*)error_pkt_str, bb_msg_read_error);
|
2008-03-19 10:30:05 +05:30
|
|
|
send_err_pkt:
|
2008-03-19 15:13:50 +05:30
|
|
|
if (error_pkt_str[0])
|
2008-05-19 03:58:26 +05:30
|
|
|
bb_error_msg((char*)error_pkt_str);
|
2008-03-19 10:30:05 +05:30
|
|
|
error_pkt[1] = TFTP_ERROR;
|
2008-05-19 03:58:26 +05:30
|
|
|
xsendto(socket_fd, error_pkt, 4 + 1 + strlen((char*)error_pkt_str),
|
2008-03-19 10:30:05 +05:30
|
|
|
&peer_lsa->u.sa, peer_lsa->len);
|
|
|
|
return EXIT_FAILURE;
|
2008-06-16 12:42:19 +05:30
|
|
|
#undef remote_file
|
|
|
|
#undef tsize
|
2001-03-03 00:38:50 +05:30
|
|
|
}
|
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
#if ENABLE_TFTP
|
|
|
|
|
2007-10-11 15:35:36 +05:30
|
|
|
int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
2008-07-05 14:48:54 +05:30
|
|
|
int tftp_main(int argc UNUSED_PARAM, char **argv)
|
2001-03-03 00:38:50 +05:30
|
|
|
{
|
2007-01-11 22:20:23 +05:30
|
|
|
len_and_sockaddr *peer_lsa;
|
2008-03-17 14:40:39 +05:30
|
|
|
const char *local_file = NULL;
|
|
|
|
const char *remote_file = NULL;
|
2008-03-21 23:59:01 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
|
|
|
const char *blksize_str = TFTP_BLKSIZE_DEFAULT_STR;
|
2008-03-19 18:37:00 +05:30
|
|
|
int blksize;
|
2008-06-16 12:42:19 +05:30
|
|
|
#endif
|
2008-03-19 18:37:00 +05:30
|
|
|
int result;
|
|
|
|
int port;
|
|
|
|
USE_GETPUT(int opt;)
|
2008-03-19 10:30:05 +05:30
|
|
|
|
|
|
|
INIT_G();
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2007-01-11 22:20:23 +05:30
|
|
|
/* -p or -g is mandatory, and they are mutually exclusive */
|
|
|
|
opt_complementary = "" USE_FEATURE_TFTP_GET("g:") USE_FEATURE_TFTP_PUT("p:")
|
2008-03-19 10:30:05 +05:30
|
|
|
USE_GETPUT("g--p:p--g:");
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2008-03-19 18:37:00 +05:30
|
|
|
USE_GETPUT(opt =) getopt32(argv,
|
2007-01-11 22:20:23 +05:30
|
|
|
USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p")
|
|
|
|
"l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"),
|
2008-03-17 14:40:39 +05:30
|
|
|
&local_file, &remote_file
|
2008-03-19 10:30:05 +05:30
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(, &blksize_str));
|
2007-05-09 04:42:21 +05:30
|
|
|
argv += optind;
|
2001-10-05 10:10:37 +05:30
|
|
|
|
2006-11-21 15:45:25 +05:30
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
2008-03-19 10:30:05 +05:30
|
|
|
/* 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");
|
2008-03-17 14:39:09 +05:30
|
|
|
return EXIT_FAILURE;
|
2008-03-19 10:30:05 +05:30
|
|
|
}
|
2006-06-10 19:45:03 +05:30
|
|
|
#endif
|
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
if (!local_file)
|
|
|
|
local_file = remote_file;
|
|
|
|
if (!remote_file)
|
|
|
|
remote_file = local_file;
|
2007-05-09 04:42:21 +05:30
|
|
|
/* Error if filename or host is not known */
|
2008-03-17 14:40:39 +05:30
|
|
|
if (!remote_file || !argv[0])
|
2006-06-10 19:45:03 +05:30
|
|
|
bb_show_usage();
|
|
|
|
|
2007-05-09 04:42:21 +05:30
|
|
|
port = bb_lookup_port(argv[1], "udp", 69);
|
|
|
|
peer_lsa = xhost2sockaddr(argv[0], port);
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2006-11-21 15:45:25 +05:30
|
|
|
#if ENABLE_DEBUG_TFTP
|
2008-03-17 14:40:39 +05:30
|
|
|
fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n",
|
2008-01-29 16:03:34 +05:30
|
|
|
xmalloc_sockaddr2dotted(&peer_lsa->u.sa),
|
2008-03-17 14:40:39 +05:30
|
|
|
remote_file, local_file);
|
2001-08-20 23:17:49 +05:30
|
|
|
#endif
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
result = tftp_protocol(
|
2008-06-16 12:42:19 +05:30
|
|
|
NULL /*our_lsa*/, peer_lsa,
|
|
|
|
local_file, remote_file
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(USE_TFTPD(, NULL /*tsize*/))
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(, blksize)
|
|
|
|
);
|
2001-03-03 00:38:50 +05:30
|
|
|
|
2008-03-19 18:37:00 +05:30
|
|
|
if (result != EXIT_SUCCESS && NOT_LONE_DASH(local_file) && CMD_GET(opt)) {
|
2008-03-17 14:40:39 +05:30
|
|
|
unlink(local_file);
|
2002-04-13 15:00:25 +05:30
|
|
|
}
|
2006-10-06 04:42:49 +05:30
|
|
|
return result;
|
2001-10-05 10:10:37 +05:30
|
|
|
}
|
2007-01-20 22:24:19 +05:30
|
|
|
|
2008-03-17 14:40:39 +05:30
|
|
|
#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;
|
2008-07-05 14:48:54 +05:30
|
|
|
int tftpd_main(int argc UNUSED_PARAM, char **argv)
|
2008-03-17 14:40:39 +05:30
|
|
|
{
|
|
|
|
len_and_sockaddr *our_lsa;
|
|
|
|
len_and_sockaddr *peer_lsa;
|
2008-03-19 18:37:00 +05:30
|
|
|
char *local_file, *mode;
|
2008-03-19 10:30:05 +05:30
|
|
|
const char *error_msg;
|
2008-03-19 18:37:00 +05:30
|
|
|
int opt, result, opcode;
|
2008-06-16 12:42:19 +05:30
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(int blksize = TFTP_BLKSIZE_DEFAULT;)
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(char *tsize = NULL;)
|
2008-03-19 10:30:05 +05:30
|
|
|
|
|
|
|
INIT_G();
|
2008-03-17 14:40:39 +05:30
|
|
|
|
|
|
|
our_lsa = get_sock_lsa(STDIN_FILENO);
|
2008-11-01 05:52:24 +05:30
|
|
|
if (!our_lsa) {
|
|
|
|
/* This is confusing:
|
|
|
|
*bb_error_msg_and_die("stdin is not a socket");
|
|
|
|
* Better: */
|
|
|
|
bb_show_usage();
|
|
|
|
/* Help text says that tftpd must be used as inetd service,
|
|
|
|
* which is by far the most usual cause of get_sock_lsa
|
|
|
|
* failure */
|
|
|
|
}
|
2008-03-17 14:40:39 +05:30
|
|
|
peer_lsa = xzalloc(LSA_LEN_SIZE + our_lsa->len);
|
|
|
|
peer_lsa->len = our_lsa->len;
|
|
|
|
|
2008-03-19 18:37:00 +05:30
|
|
|
/* Shifting to not collide with TFTP_OPTs */
|
|
|
|
opt = option_mask32 = TFTPD_OPT | (getopt32(argv, "rcu:", &user_opt) << 8);
|
2008-03-18 06:43:11 +05:30
|
|
|
argv += optind;
|
|
|
|
if (argv[0])
|
|
|
|
xchdir(argv[0]);
|
2008-03-17 14:40:39 +05:30
|
|
|
|
|
|
|
result = recv_from_to(STDIN_FILENO, block_buf, sizeof(block_buf),
|
|
|
|
0 /* flags */,
|
|
|
|
&peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len);
|
|
|
|
|
2008-03-19 10:30:05 +05:30
|
|
|
error_msg = "malformed packet";
|
2008-03-17 14:40:39 +05:30
|
|
|
opcode = ntohs(*(uint16_t*)block_buf);
|
|
|
|
if (result < 4 || result >= sizeof(block_buf)
|
|
|
|
|| block_buf[result-1] != '\0'
|
2008-03-21 23:59:01 +05:30
|
|
|
|| (USE_FEATURE_TFTP_PUT(opcode != TFTP_RRQ) /* not download */
|
2008-03-18 06:43:11 +05:30
|
|
|
USE_GETPUT(&&)
|
|
|
|
USE_FEATURE_TFTP_GET(opcode != TFTP_WRQ) /* not upload */
|
|
|
|
)
|
2008-03-17 14:40:39 +05:30
|
|
|
) {
|
2008-03-19 10:30:05 +05:30
|
|
|
goto err;
|
2008-03-17 14:40:39 +05:30
|
|
|
}
|
2008-03-19 18:37:00 +05:30
|
|
|
local_file = block_buf + 2;
|
|
|
|
if (local_file[0] == '.' || strstr(local_file, "/.")) {
|
2008-03-20 05:07:32 +05:30
|
|
|
error_msg = "dot in file name";
|
2008-03-19 10:30:05 +05:30
|
|
|
goto err;
|
2008-03-17 14:40:39 +05:30
|
|
|
}
|
2008-03-19 18:37:00 +05:30
|
|
|
mode = local_file + strlen(local_file) + 1;
|
|
|
|
if (mode >= block_buf + result || strcmp(mode, "octet") != 0) {
|
2008-03-19 10:30:05 +05:30
|
|
|
goto err;
|
2008-03-17 14:40:39 +05:30
|
|
|
}
|
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
2008-03-19 10:30:05 +05:30
|
|
|
{
|
|
|
|
char *res;
|
|
|
|
char *opt_str = mode + sizeof("octet");
|
|
|
|
int opt_len = block_buf + result - opt_str;
|
|
|
|
if (opt_len > 0) {
|
2008-06-16 12:42:19 +05:30
|
|
|
res = tftp_get_option("blksize", opt_str, opt_len);
|
2008-03-19 10:30:05 +05:30
|
|
|
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;
|
|
|
|
}
|
|
|
|
}
|
2008-06-16 12:42:19 +05:30
|
|
|
/* did client ask us about file size? */
|
|
|
|
tsize = tftp_get_option("tsize", opt_str, opt_len);
|
2008-03-17 14:40:39 +05:30
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
2008-03-18 06:43:11 +05:30
|
|
|
|
|
|
|
if (!ENABLE_FEATURE_TFTP_PUT || opcode == TFTP_WRQ) {
|
2008-03-19 18:37:00 +05:30
|
|
|
if (opt & TFTPD_OPT_r) {
|
2008-03-19 15:13:50 +05:30
|
|
|
/* This would mean "disk full" - not true */
|
|
|
|
/*error_pkt_reason = ERR_WRITE;*/
|
|
|
|
error_msg = bb_msg_write_error;
|
|
|
|
goto err;
|
2008-03-19 10:30:05 +05:30
|
|
|
}
|
2008-03-19 18:37:00 +05:30
|
|
|
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 */
|
2008-03-19 10:30:05 +05:30
|
|
|
}
|
2008-03-17 14:40:39 +05:30
|
|
|
|
2008-03-19 10:30:05 +05:30
|
|
|
/* NB: if error_pkt_str or error_pkt_reason is set up,
|
|
|
|
* tftp_protocol() just sends one error pkt and returns */
|
2008-06-16 12:42:19 +05:30
|
|
|
|
2008-03-19 10:30:05 +05:30
|
|
|
do_proto:
|
2008-06-16 12:42:19 +05:30
|
|
|
close(STDIN_FILENO); /* close old, possibly wildcard socket */
|
|
|
|
/* tftp_protocol() will create new one, bound to particular local IP */
|
2008-03-17 14:40:39 +05:30
|
|
|
result = tftp_protocol(
|
|
|
|
our_lsa, peer_lsa,
|
2008-06-16 12:42:19 +05:30
|
|
|
local_file USE_TFTP(, NULL /*remote_file*/)
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(, tsize)
|
|
|
|
USE_FEATURE_TFTP_BLOCKSIZE(, blksize)
|
2008-03-17 14:40:39 +05:30
|
|
|
);
|
|
|
|
|
|
|
|
return result;
|
2008-03-19 18:37:00 +05:30
|
|
|
err:
|
2008-05-19 03:58:26 +05:30
|
|
|
strcpy((char*)error_pkt_str, error_msg);
|
2008-03-19 18:37:00 +05:30
|
|
|
goto do_proto;
|
2008-03-17 14:40:39 +05:30
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* ENABLE_TFTPD */
|
|
|
|
|
2007-01-20 22:24:19 +05:30
|
|
|
#endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */
|