891 lines
25 KiB
C
891 lines
25 KiB
C
/* vi: set sw=4 ts=4: */
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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 source tree.
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*/
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//usage:#define tftp_trivial_usage
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//usage: "[OPTIONS] HOST [PORT]"
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//usage:#define tftp_full_usage "\n\n"
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//usage: "Transfer a file from/to tftp server\n"
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//usage: "\n -l FILE Local FILE"
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//usage: "\n -r FILE Remote FILE"
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//usage: IF_FEATURE_TFTP_GET(
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//usage: "\n -g Get file"
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//usage: )
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//usage: IF_FEATURE_TFTP_PUT(
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//usage: "\n -p Put file"
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//usage: )
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//usage: IF_FEATURE_TFTP_BLOCKSIZE(
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//usage: "\n -b SIZE Transfer blocks of SIZE octets"
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//usage: )
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//usage:
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//usage:#define tftpd_trivial_usage
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//usage: "[-cr] [-u USER] [DIR]"
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//usage:#define tftpd_full_usage "\n\n"
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//usage: "Transfer a file on tftp client's request\n"
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//usage: "\n"
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//usage: "tftpd should be used as an inetd service.\n"
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//usage: "tftpd's line for inetd.conf:\n"
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//usage: " 69 dgram udp nowait root tftpd tftpd -l /files/to/serve\n"
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//usage: "It also can be ran from udpsvd:\n"
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//usage: " udpsvd -vE 0.0.0.0 69 tftpd /files/to/serve\n"
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//usage: "\n -r Prohibit upload"
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//usage: "\n -c Allow file creation via upload"
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//usage: "\n -u Access files as USER"
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//usage: "\n -l Log to syslog (inetd mode requires this)"
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#include "libbb.h"
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#include <syslog.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_BLKSIZE_DEFAULT_STR "512"
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/* Was 50 ms but users asked to bump it up a bit */
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#define TFTP_TIMEOUT_MS 100
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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, 1, 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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TFTPD_OPT_l = (1 << 11) * ENABLE_TFTPD,
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};
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#if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
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#define IF_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 IF_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 IF_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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struct passwd *pw;
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/* Used in tftpd_main() for initial packet */
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/* Some HP PA-RISC firmware always sends fixed 516-byte requests */
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char block_buf[516];
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char block_buf_tail[1];
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#if ENABLE_FEATURE_TFTP_PROGRESS_BAR
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off_t pos;
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off_t size;
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const char *file;
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bb_progress_t pmt;
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#endif
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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struct BUG_G_too_big {
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char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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};
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#define INIT_G() do { } while (0)
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#define G_error_pkt_reason (G.error_pkt[3])
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#define G_error_pkt_str ((char*)(G.error_pkt + 4))
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#if ENABLE_FEATURE_TFTP_PROGRESS_BAR
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static void tftp_progress_update(void)
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{
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bb_progress_update(&G.pmt, 0, G.pos, G.size);
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}
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static void tftp_progress_init(void)
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{
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bb_progress_init(&G.pmt, G.file);
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tftp_progress_update();
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}
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static void tftp_progress_done(void)
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{
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if (is_bb_progress_inited(&G.pmt)) {
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tftp_progress_update();
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bb_putchar_stderr('\n');
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bb_progress_free(&G.pmt);
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}
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}
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#else
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# define tftp_progress_init() ((void)0)
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# define tftp_progress_done() ((void)0)
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#endif
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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_TFTP_DEBUG
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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_option(const char *option, char *buf, int len)
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{
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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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}
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#endif
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static int tftp_protocol(
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/* NULL if tftp, !NULL if tftpd: */
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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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IF_TFTP(, const char *remote_file)
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#if !ENABLE_TFTP
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# define remote_file NULL
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#endif
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/* 1 for tftp; 1/0 for tftpd depending whether client asked about it: */
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IF_FEATURE_TFTP_BLOCKSIZE(, int want_transfer_size)
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IF_FEATURE_TFTP_BLOCKSIZE(, int blksize))
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{
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#if !ENABLE_FEATURE_TFTP_BLOCKSIZE
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enum { blksize = TFTP_BLKSIZE_DEFAULT };
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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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IF_FEATURE_TFTP_BLOCKSIZE(smallint expect_OACK = 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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*
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* We must keep the transmit and receive buffers separate
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* in case we rcv a garbage pkt - we need to rexmit the last pkt.
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*/
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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_TFTP || our_lsa) { /* 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 (G_error_pkt_reason || G_error_pkt_str[0])
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goto send_err_pkt;
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if (G.pw) {
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change_identity(G.pw); /* initgroups, setgid, setuid */
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}
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}
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/* Prepare open mode */
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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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/* Examples of network traffic.
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* Note two cases when ACKs with block# of 0 are sent.
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*
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* Download without options:
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* tftp -> "\0\1FILENAME\0octet\0"
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* "\0\3\0\1FILEDATA..." <- tftpd
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* tftp -> "\0\4\0\1"
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* ...
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* Download with option of blksize 16384:
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* tftp -> "\0\1FILENAME\0octet\0blksize\00016384\0"
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* "\0\6blksize\00016384\0" <- tftpd
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* tftp -> "\0\4\0\0"
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* "\0\3\0\1FILEDATA..." <- tftpd
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* tftp -> "\0\4\0\1"
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* ...
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* Upload without options:
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* tftp -> "\0\2FILENAME\0octet\0"
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* "\0\4\0\0" <- tftpd
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* tftp -> "\0\3\0\1FILEDATA..."
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* "\0\4\0\1" <- tftpd
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* ...
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* Upload with option of blksize 16384:
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* tftp -> "\0\2FILENAME\0octet\0blksize\00016384\0"
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* "\0\6blksize\00016384\0" <- tftpd
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* tftp -> "\0\3\0\1FILEDATA..."
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* "\0\4\0\1" <- tftpd
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* ...
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*/
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block_nr = 1;
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cp = xbuf + 2;
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if (!ENABLE_TFTP || our_lsa) { /* tftpd */
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/* Open file (must be after changing user) */
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local_fd = open(local_file, open_mode, 0666);
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if (local_fd < 0) {
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G_error_pkt_reason = ERR_NOFILE;
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strcpy(G_error_pkt_str, "can't open file");
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goto send_err_pkt;
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}
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/* gcc 4.3.1 would NOT optimize it out as it should! */
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#if ENABLE_FEATURE_TFTP_BLOCKSIZE
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if (blksize != TFTP_BLKSIZE_DEFAULT || want_transfer_size) {
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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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goto add_blksize_opt;
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}
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#endif
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if (CMD_GET(option_mask32)) {
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/* It's upload and we don't send OACK.
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* We must ACK 1st packet (with filename)
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* as if it is "block 0" */
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block_nr = 0;
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}
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} else { /* tftp */
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/* Open file (must be after changing user) */
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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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/* Removing #if, or using if() statement instead of #if may lead to
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* "warning: null argument where non-null required": */
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#if ENABLE_TFTP
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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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/* 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 packet */
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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 && !want_transfer_size)
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goto send_pkt;
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/* Need to add option to pkt */
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if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN tsize ") + sizeof(off_t)*3) {
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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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expect_OACK = 1;
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# endif
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#endif /* ENABLE_TFTP */
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#if ENABLE_FEATURE_TFTP_BLOCKSIZE
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add_blksize_opt:
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if (blksize != TFTP_BLKSIZE_DEFAULT) {
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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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if (want_transfer_size) {
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/* add "tsize", <nul>, size, <nul> (see RFC2349) */
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/* if tftp and downloading, we send "0" (since we opened local_fd with O_TRUNC)
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* and this makes server to send "tsize" option with the size */
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/* if tftp and uploading, we send file size (maybe dont, to not confuse old servers???) */
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/* if tftpd and downloading, we are answering to client's request */
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/* if tftpd and uploading: !want_transfer_size, this code is not executed */
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struct stat st;
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strcpy(cp, "tsize");
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cp += sizeof("tsize");
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st.st_size = 0;
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fstat(local_fd, &st);
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cp += sprintf(cp, "%"OFF_FMT"u", (off_t)st.st_size) + 1;
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# if ENABLE_FEATURE_TFTP_PROGRESS_BAR
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/* Save for progress bar. If 0 (tftp downloading),
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* we look at server's reply later */
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G.size = st.st_size;
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if (remote_file && st.st_size)
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tftp_progress_init();
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# endif
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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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IF_FEATURE_TFTP_PROGRESS_BAR(G.pos += 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
|
|
* for potential resend */
|
|
|
|
retries = TFTP_NUM_RETRIES; /* re-initialize */
|
|
waittime_ms = TFTP_TIMEOUT_MS;
|
|
|
|
send_again:
|
|
#if ENABLE_TFTP_DEBUG
|
|
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");
|
|
#endif
|
|
xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
|
|
|
|
#if ENABLE_FEATURE_TFTP_PROGRESS_BAR
|
|
if (is_bb_progress_inited(&G.pmt))
|
|
tftp_progress_update();
|
|
#endif
|
|
/* Was it final ACK? then exit */
|
|
if (finished && (opcode == TFTP_ACK))
|
|
goto ret;
|
|
|
|
recv_again:
|
|
/* Receive packet */
|
|
/*pfd[0].fd = socket_fd;*/
|
|
pfd[0].events = POLLIN;
|
|
switch (safe_poll(pfd, 1, waittime_ms)) {
|
|
default:
|
|
/*bb_perror_msg("poll"); - done in safe_poll */
|
|
goto ret;
|
|
case 0:
|
|
retries--;
|
|
if (retries == 0) {
|
|
tftp_progress_done();
|
|
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 */
|
|
case 1:
|
|
if (!our_lsa) {
|
|
/* tftp (not tftpd!) receiving 1st packet */
|
|
our_lsa = ((void*)(ptrdiff_t)-1); /* not NULL */
|
|
len = recvfrom(socket_fd, rbuf, io_bufsize, 0,
|
|
&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. */
|
|
/* Don't full_read()!
|
|
* This is not TCP, one read == one pkt! */
|
|
len = safe_read(socket_fd, rbuf, io_bufsize);
|
|
}
|
|
if (len < 0) {
|
|
goto send_read_err_pkt;
|
|
}
|
|
if (len < 4) { /* too small? */
|
|
goto recv_again;
|
|
}
|
|
}
|
|
|
|
/* Process recv'ed packet */
|
|
opcode = ntohs( ((uint16_t*)rbuf)[0] );
|
|
recv_blk = ntohs( ((uint16_t*)rbuf)[1] );
|
|
#if ENABLE_TFTP_DEBUG
|
|
fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk);
|
|
#endif
|
|
if (opcode == TFTP_ERROR) {
|
|
static const char errcode_str[] ALIGN1 =
|
|
"\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";
|
|
|
|
const char *msg = "";
|
|
|
|
if (len > 4 && rbuf[4] != '\0') {
|
|
msg = &rbuf[4];
|
|
rbuf[io_bufsize - 1] = '\0'; /* paranoia */
|
|
} else if (recv_blk <= 8) {
|
|
msg = nth_string(errcode_str, recv_blk);
|
|
}
|
|
bb_error_msg("server error: (%u) %s", recv_blk, msg);
|
|
goto ret;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
|
if (expect_OACK) {
|
|
expect_OACK = 0;
|
|
if (opcode == TFTP_OACK) {
|
|
/* server seems to support options */
|
|
char *res;
|
|
|
|
res = tftp_get_option("blksize", &rbuf[2], len - 2);
|
|
if (res) {
|
|
blksize = tftp_blksize_check(res, blksize);
|
|
if (blksize < 0) {
|
|
G_error_pkt_reason = ERR_BAD_OPT;
|
|
goto send_err_pkt;
|
|
}
|
|
io_bufsize = blksize + 4;
|
|
}
|
|
# if ENABLE_FEATURE_TFTP_PROGRESS_BAR
|
|
if (remote_file && G.size == 0) { /* if we don't know it yet */
|
|
res = tftp_get_option("tsize", &rbuf[2], len - 2);
|
|
if (res) {
|
|
G.size = bb_strtoull(res, NULL, 10);
|
|
if (G.size)
|
|
tftp_progress_init();
|
|
}
|
|
}
|
|
# endif
|
|
if (CMD_GET(option_mask32)) {
|
|
/* We'll send ACK for OACK,
|
|
* such ACK has "block no" of 0 */
|
|
block_nr = 0;
|
|
}
|
|
continue;
|
|
}
|
|
/* rfc2347:
|
|
* "An option not acknowledged by the server
|
|
* must be ignored by the client and server
|
|
* as if it were never requested." */
|
|
if (blksize != TFTP_BLKSIZE_DEFAULT)
|
|
bb_error_msg("falling back to blocksize "TFTP_BLKSIZE_DEFAULT_STR);
|
|
blksize = TFTP_BLKSIZE_DEFAULT;
|
|
io_bufsize = TFTP_BLKSIZE_DEFAULT + 4;
|
|
}
|
|
#endif
|
|
/* block_nr is already advanced to next block# we expect
|
|
* to get / block# we are about to send next time */
|
|
|
|
if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) {
|
|
if (recv_blk == block_nr) {
|
|
int sz = full_write(local_fd, &rbuf[4], len - 4);
|
|
if (sz != len - 4) {
|
|
strcpy(G_error_pkt_str, bb_msg_write_error);
|
|
G_error_pkt_reason = ERR_WRITE;
|
|
goto send_err_pkt;
|
|
}
|
|
if (sz != blksize) {
|
|
finished = 1;
|
|
}
|
|
IF_FEATURE_TFTP_PROGRESS_BAR(G.pos += sz;)
|
|
continue; /* send ACK */
|
|
}
|
|
/* Disabled to cope with servers with Sorcerer's Apprentice Syndrome */
|
|
#if 0
|
|
if (recv_blk == (block_nr - 1)) {
|
|
/* Server lost our TFTP_ACK. Resend it */
|
|
block_nr = recv_blk;
|
|
continue;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
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(G_error_pkt_str, bb_msg_read_error);
|
|
send_err_pkt:
|
|
if (G_error_pkt_str[0])
|
|
bb_error_msg("%s", G_error_pkt_str);
|
|
G.error_pkt[1] = TFTP_ERROR;
|
|
xsendto(socket_fd, G.error_pkt, 4 + 1 + strlen(G_error_pkt_str),
|
|
&peer_lsa->u.sa, peer_lsa->len);
|
|
return EXIT_FAILURE;
|
|
#undef remote_file
|
|
}
|
|
|
|
#if ENABLE_TFTP
|
|
|
|
int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int tftp_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
len_and_sockaddr *peer_lsa;
|
|
const char *local_file = NULL;
|
|
const char *remote_file = NULL;
|
|
# if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
|
const char *blksize_str = TFTP_BLKSIZE_DEFAULT_STR;
|
|
int blksize;
|
|
# endif
|
|
int result;
|
|
int port;
|
|
IF_GETPUT(int opt;)
|
|
|
|
INIT_G();
|
|
|
|
/* -p or -g is mandatory, and they are mutually exclusive */
|
|
opt_complementary = "" IF_FEATURE_TFTP_GET("g:") IF_FEATURE_TFTP_PUT("p:")
|
|
IF_GETPUT("g--p:p--g:");
|
|
|
|
IF_GETPUT(opt =) getopt32(argv,
|
|
IF_FEATURE_TFTP_GET("g") IF_FEATURE_TFTP_PUT("p")
|
|
"l:r:" IF_FEATURE_TFTP_BLOCKSIZE("b:"),
|
|
&local_file, &remote_file
|
|
IF_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 (remote_file) {
|
|
if (!local_file) {
|
|
const char *slash = strrchr(remote_file, '/');
|
|
local_file = slash ? slash + 1 : remote_file;
|
|
}
|
|
} else {
|
|
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_TFTP_DEBUG
|
|
fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n",
|
|
xmalloc_sockaddr2dotted(&peer_lsa->u.sa),
|
|
remote_file, local_file);
|
|
# endif
|
|
|
|
# if ENABLE_FEATURE_TFTP_PROGRESS_BAR
|
|
G.file = remote_file;
|
|
# endif
|
|
result = tftp_protocol(
|
|
NULL /*our_lsa*/, peer_lsa,
|
|
local_file, remote_file
|
|
IF_FEATURE_TFTP_BLOCKSIZE(, 1 /* want_transfer_size */)
|
|
IF_FEATURE_TFTP_BLOCKSIZE(, blksize)
|
|
);
|
|
tftp_progress_done();
|
|
|
|
if (result != EXIT_SUCCESS && NOT_LONE_DASH(local_file) && CMD_GET(opt)) {
|
|
unlink(local_file);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#endif /* ENABLE_TFTP */
|
|
|
|
#if ENABLE_TFTPD
|
|
int tftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int tftpd_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
len_and_sockaddr *our_lsa;
|
|
len_and_sockaddr *peer_lsa;
|
|
char *local_file, *mode, *user_opt;
|
|
const char *error_msg;
|
|
int opt, result, opcode;
|
|
IF_FEATURE_TFTP_BLOCKSIZE(int blksize = TFTP_BLKSIZE_DEFAULT;)
|
|
IF_FEATURE_TFTP_BLOCKSIZE(int want_transfer_size = 0;)
|
|
|
|
INIT_G();
|
|
|
|
our_lsa = get_sock_lsa(STDIN_FILENO);
|
|
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 */
|
|
}
|
|
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:l", &user_opt) << 8);
|
|
argv += optind;
|
|
if (opt & TFTPD_OPT_l) {
|
|
openlog(applet_name, LOG_PID, LOG_DAEMON);
|
|
logmode = LOGMODE_SYSLOG;
|
|
}
|
|
if (opt & TFTPD_OPT_u) {
|
|
/* Must be before xchroot */
|
|
G.pw = xgetpwnam(user_opt);
|
|
}
|
|
if (argv[0]) {
|
|
xchroot(argv[0]);
|
|
}
|
|
|
|
result = recv_from_to(STDIN_FILENO,
|
|
G.block_buf, sizeof(G.block_buf) + 1,
|
|
/* ^^^ sizeof+1 to reliably detect oversized input */
|
|
0 /* flags */,
|
|
&peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len);
|
|
|
|
error_msg = "malformed packet";
|
|
opcode = ntohs(*(uint16_t*)G.block_buf);
|
|
if (result < 4 || result > sizeof(G.block_buf)
|
|
/*|| G.block_buf[result-1] != '\0' - bug compatibility, see below */
|
|
|| (IF_FEATURE_TFTP_PUT(opcode != TFTP_RRQ) /* not download */
|
|
IF_GETPUT(&&)
|
|
IF_FEATURE_TFTP_GET(opcode != TFTP_WRQ) /* not upload */
|
|
)
|
|
) {
|
|
goto err;
|
|
}
|
|
/* Some HP PA-RISC firmware always sends fixed 516-byte requests,
|
|
* with trailing garbage.
|
|
* Support that by not requiring NUL to be the last byte (see above).
|
|
* To make strXYZ() ops safe, force NUL termination:
|
|
*/
|
|
G.block_buf_tail[0] = '\0';
|
|
|
|
local_file = G.block_buf + 2;
|
|
if (local_file[0] == '.' || strstr(local_file, "/.")) {
|
|
error_msg = "dot in file name";
|
|
goto err;
|
|
}
|
|
mode = local_file + strlen(local_file) + 1;
|
|
/* RFC 1350 says mode string is case independent */
|
|
if (mode >= G.block_buf + result || strcasecmp(mode, "octet") != 0) {
|
|
goto err;
|
|
}
|
|
# if ENABLE_FEATURE_TFTP_BLOCKSIZE
|
|
{
|
|
char *res;
|
|
char *opt_str = mode + sizeof("octet");
|
|
int opt_len = G.block_buf + result - opt_str;
|
|
if (opt_len > 0) {
|
|
res = tftp_get_option("blksize", opt_str, opt_len);
|
|
if (res) {
|
|
blksize = tftp_blksize_check(res, 65564);
|
|
if (blksize < 0) {
|
|
G_error_pkt_reason = ERR_BAD_OPT;
|
|
/* will just send error pkt */
|
|
goto do_proto;
|
|
}
|
|
}
|
|
if (opcode != TFTP_WRQ /* download? */
|
|
/* did client ask us about file size? */
|
|
&& tftp_get_option("tsize", opt_str, opt_len)
|
|
) {
|
|
want_transfer_size = 1;
|
|
}
|
|
}
|
|
}
|
|
# endif
|
|
|
|
if (!ENABLE_FEATURE_TFTP_PUT || opcode == TFTP_WRQ) {
|
|
if (opt & TFTPD_OPT_r) {
|
|
/* This would mean "disk full" - not true */
|
|
/*G_error_pkt_reason = ERR_WRITE;*/
|
|
error_msg = bb_msg_write_error;
|
|
goto err;
|
|
}
|
|
IF_GETPUT(option_mask32 |= TFTP_OPT_GET;) /* will receive file's data */
|
|
} else {
|
|
IF_GETPUT(option_mask32 |= TFTP_OPT_PUT;) /* will send file's data */
|
|
}
|
|
|
|
/* NB: if G_error_pkt_str or G_error_pkt_reason is set up,
|
|
* tftp_protocol() just sends one error pkt and returns */
|
|
|
|
do_proto:
|
|
close(STDIN_FILENO); /* close old, possibly wildcard socket */
|
|
/* tftp_protocol() will create new one, bound to particular local IP */
|
|
result = tftp_protocol(
|
|
our_lsa, peer_lsa,
|
|
local_file IF_TFTP(, NULL /*remote_file*/)
|
|
IF_FEATURE_TFTP_BLOCKSIZE(, want_transfer_size)
|
|
IF_FEATURE_TFTP_BLOCKSIZE(, blksize)
|
|
);
|
|
|
|
return result;
|
|
err:
|
|
strcpy(G_error_pkt_str, error_msg);
|
|
goto do_proto;
|
|
}
|
|
|
|
#endif /* ENABLE_TFTPD */
|
|
|
|
#endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */
|