/* vi: set sw=4 ts=4: */
-/* -------------------------------------------------------------------------
- * tftp.c
- *
+/*
* A simple tftp client/server for busybox.
* Tries to follow RFC1350.
* Only "octet" mode supported.
*
* tftpd added by Denys Vlasenko & Vladimir Dronnikov
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- * ------------------------------------------------------------------------- */
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+//usage:#define tftp_trivial_usage
+//usage: "[OPTIONS] HOST [PORT]"
+//usage:#define tftp_full_usage "\n\n"
+//usage: "Transfer a file from/to tftp server\n"
+//usage: "\n -l FILE Local FILE"
+//usage: "\n -r FILE Remote FILE"
+//usage: IF_FEATURE_TFTP_GET(
+//usage: "\n -g Get file"
+//usage: )
+//usage: IF_FEATURE_TFTP_PUT(
+//usage: "\n -p Put file"
+//usage: )
+//usage: IF_FEATURE_TFTP_BLOCKSIZE(
+//usage: "\n -b SIZE Transfer blocks of SIZE octets"
+//usage: )
+//usage:
+//usage:#define tftpd_trivial_usage
+//usage: "[-cr] [-u USER] [DIR]"
+//usage:#define tftpd_full_usage "\n\n"
+//usage: "Transfer a file on tftp client's request\n"
+//usage: "\n"
+//usage: "tftpd should be used as an inetd service.\n"
+//usage: "tftpd's line for inetd.conf:\n"
+//usage: " 69 dgram udp nowait root tftpd tftpd -l /files/to/serve\n"
+//usage: "It also can be ran from udpsvd:\n"
+//usage: " udpsvd -vE 0.0.0.0 69 tftpd /files/to/serve\n"
+//usage: "\n -r Prohibit upload"
+//usage: "\n -c Allow file creation via upload"
+//usage: "\n -u Access files as USER"
+//usage: "\n -l Log to syslog (inetd mode requires this)"
#include "libbb.h"
+#include <syslog.h>
#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
-#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
-#define TFTP_TIMEOUT_MS 50
-#define TFTP_MAXTIMEOUT_MS 2000
-#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */
+#define TFTP_BLKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
+#define TFTP_BLKSIZE_DEFAULT_STR "512"
+/* Was 50 ms but users asked to bump it up a bit */
+#define TFTP_TIMEOUT_MS 100
+#define TFTP_MAXTIMEOUT_MS 2000
+#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */
/* opcodes we support */
#define TFTP_RRQ 1
#define TFTP_ERROR 5
#define TFTP_OACK 6
+/* error codes sent over network (we use only 0, 1, 3 and 8) */
+/* generic (error message is included in the packet) */
+#define ERR_UNSPEC 0
+#define ERR_NOFILE 1
+#define ERR_ACCESS 2
+/* disk full or allocation exceeded */
+#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
+
+/* 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,
+ TFTPD_OPT_l = (1 << 11) * ENABLE_TFTPD,
+};
+
#if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
-#define USE_GETPUT(...)
+#define IF_GETPUT(...)
#define CMD_GET(cmd) 1
#define CMD_PUT(cmd) 0
#elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
-#define USE_GETPUT(...)
+#define IF_GETPUT(...)
#define CMD_GET(cmd) 0
#define CMD_PUT(cmd) 1
#else
-#define USE_GETPUT(...) __VA_ARGS__
-/* masks coming from getopt32 */
-#define CMD_GET(cmd) ((cmd) & 1)
-#define CMD_PUT(cmd) ((cmd) & 2)
+#define IF_GETPUT(...) __VA_ARGS__
+#define CMD_GET(cmd) ((cmd) & TFTP_OPT_GET)
+#define CMD_PUT(cmd) ((cmd) & TFTP_OPT_PUT)
#endif
/* NB: in the code below
* CMD_GET(cmd) and CMD_PUT(cmd) are mutually exclusive
*/
-// TODO: emit error packets before dying
+struct globals {
+ /* u16 TFTP_ERROR; u16 reason; both network-endian, then error text: */
+ uint8_t error_pkt[4 + 32];
+ struct passwd *pw;
+ /* used in tftpd_main(), a bit big for stack: */
+ char block_buf[TFTP_BLKSIZE_DEFAULT];
+#if ENABLE_FEATURE_TFTP_PROGRESS_BAR
+ off_t pos;
+ off_t size;
+ const char *file;
+ bb_progress_t pmt;
+#endif
+} FIX_ALIASING;
+#define G (*(struct globals*)&bb_common_bufsiz1)
+struct BUG_G_too_big {
+ char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
+};
+#define INIT_G() do { } while (0)
+
+#define G_error_pkt_reason (G.error_pkt[3])
+#define G_error_pkt_str ((char*)(G.error_pkt + 4))
+
+#if ENABLE_FEATURE_TFTP_PROGRESS_BAR
+static void tftp_progress_update(void)
+{
+ bb_progress_update(&G.pmt, 0, G.pos, G.size);
+}
+static void tftp_progress_init(void)
+{
+ bb_progress_init(&G.pmt, G.file);
+ tftp_progress_update();
+}
+static void tftp_progress_done(void)
+{
+ if (is_bb_progress_inited(&G.pmt)) {
+ tftp_progress_update();
+ bb_putchar_stderr('\n');
+ bb_progress_free(&G.pmt);
+ }
+}
+#else
+# define tftp_progress_init() ((void)0)
+# define tftp_progress_done() ((void)0)
+#endif
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
-static int tftp_blocksize_check(int blocksize, int bufsize)
+static int tftp_blksize_check(const char *blksize_str, int maxsize)
{
- /* Check if the blocksize is valid:
+ /* Check if the blksize is valid:
* RFC2348 says between 8 and 65464,
* but our implementation makes it impossible
- * to use blocksizes smaller than 22 octets.
- */
- if ((bufsize && (blocksize > bufsize))
- || (blocksize < 24) || (blocksize > 65564)
+ * to use blksizes smaller than 22 octets. */
+ unsigned blksize = bb_strtou(blksize_str, NULL, 10);
+ if (errno
+ || (blksize < 24) || (blksize > maxsize)
) {
- bb_error_msg("bad blocksize");
- return 0;
+ bb_error_msg("bad blocksize '%s'", blksize_str);
+ return -1;
}
- return blocksize;
+# if ENABLE_TFTP_DEBUG
+ bb_error_msg("using blksize %u", blksize);
+# endif
+ return blksize;
}
-static char *tftp_option_get(char *buf, int len, const char *option)
+static char *tftp_get_option(const char *option, char *buf, int len)
{
int opt_val = 0;
int opt_found = 0;
#endif
static int tftp_protocol(
- USE_GETPUT(int cmd,)
+ /* NULL if tftp, !NULL if tftpd: */
len_and_sockaddr *our_lsa,
len_and_sockaddr *peer_lsa,
- USE_TFTP(const char *remote_file,)
- int local_fd,
- int blocksize)
-{
+ const char *local_file
+ IF_TFTP(, const char *remote_file)
#if !ENABLE_TFTP
-#define remote_file NULL
+# define remote_file NULL
+#endif
+ /* 1 for tftp; 1/0 for tftpd depending whether client asked about it: */
+ IF_FEATURE_TFTP_BLOCKSIZE(, int want_transfer_size)
+ IF_FEATURE_TFTP_BLOCKSIZE(, int blksize))
+{
+#if !ENABLE_FEATURE_TFTP_BLOCKSIZE
+ enum { blksize = TFTP_BLKSIZE_DEFAULT };
#endif
+
struct pollfd pfd[1];
#define socket_fd (pfd[0].fd)
int len;
int send_len;
- USE_FEATURE_TFTP_BLOCKSIZE(smallint want_option_ack = 0;)
+ IF_FEATURE_TFTP_BLOCKSIZE(smallint expect_OACK = 0;)
smallint finished = 0;
uint16_t opcode;
uint16_t block_nr;
uint16_t recv_blk;
+ int open_mode, local_fd;
int retries, waittime_ms;
- int tftp_bufsize = blocksize + 4;
+ int io_bufsize = blksize + 4;
char *cp;
/* Can't use RESERVE_CONFIG_BUFFER here since the allocation
- * size varies meaning BUFFERS_GO_ON_STACK would fail */
- /* We must keep the transmit and receive buffers seperate */
- /* In case we rcv a garbage pkt and we need to rexmit the last pkt */
- char *xbuf = xmalloc(tftp_bufsize);
- char *rbuf = xmalloc(tftp_bufsize);
+ * size varies meaning BUFFERS_GO_ON_STACK would fail.
+ *
+ * We must keep the transmit and receive buffers separate
+ * in case we rcv a garbage pkt - we need to rexmit the last pkt.
+ */
+ char *xbuf = xmalloc(io_bufsize);
+ char *rbuf = xmalloc(io_bufsize);
socket_fd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0);
setsockopt_reuseaddr(socket_fd);
- block_nr = 1;
- if (!ENABLE_TFTP || our_lsa) {
- /* tftpd */
-
+ if (!ENABLE_TFTP || our_lsa) { /* tftpd */
/* Create a socket which is:
* 1. bound to IP:port peer sent 1st datagram to,
* 2. connected to peer's IP:port
xbind(socket_fd, &our_lsa->u.sa, our_lsa->len);
xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
- if (CMD_GET(cmd)) {
- /* it's upload - we must ACK 1st packet (with filename)
- * as if it's "block 0" */
- block_nr = 0;
+ /* Is there an error already? Send pkt and bail out */
+ if (G_error_pkt_reason || G_error_pkt_str[0])
+ goto send_err_pkt;
+
+ if (G.pw) {
+ change_identity(G.pw); /* initgroups, setgid, setuid */
}
+ }
+
+ /* Prepare open mode */
+ 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
+ }
+ /* Examples of network traffic.
+ * Note two cases when ACKs with block# of 0 are sent.
+ *
+ * Download without options:
+ * tftp -> "\0\1FILENAME\0octet\0"
+ * "\0\3\0\1FILEDATA..." <- tftpd
+ * tftp -> "\0\4\0\1"
+ * ...
+ * Download with option of blksize 16384:
+ * tftp -> "\0\1FILENAME\0octet\0blksize\00016384\0"
+ * "\0\6blksize\00016384\0" <- tftpd
+ * tftp -> "\0\4\0\0"
+ * "\0\3\0\1FILEDATA..." <- tftpd
+ * tftp -> "\0\4\0\1"
+ * ...
+ * Upload without options:
+ * tftp -> "\0\2FILENAME\0octet\0"
+ * "\0\4\0\0" <- tftpd
+ * tftp -> "\0\3\0\1FILEDATA..."
+ * "\0\4\0\1" <- tftpd
+ * ...
+ * Upload with option of blksize 16384:
+ * tftp -> "\0\2FILENAME\0octet\0blksize\00016384\0"
+ * "\0\6blksize\00016384\0" <- tftpd
+ * tftp -> "\0\3\0\1FILEDATA..."
+ * "\0\4\0\1" <- tftpd
+ * ...
+ */
+ block_nr = 1;
+ cp = xbuf + 2;
+
+ if (!ENABLE_TFTP || our_lsa) { /* tftpd */
+ /* Open file (must be after changing user) */
+ local_fd = open(local_file, open_mode, 0666);
+ if (local_fd < 0) {
+ G_error_pkt_reason = ERR_NOFILE;
+ strcpy(G_error_pkt_str, "can't open file");
+ goto send_err_pkt;
+ }
+/* gcc 4.3.1 would NOT optimize it out as it should! */
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
- if (blocksize != TFTP_BLOCKSIZE_DEFAULT) {
- /* Create and send OACK packet */
- /* block_nr is still 1, we expect ACK to (block_nr-1),
- * that is, to "block 0" */
+ if (blksize != TFTP_BLKSIZE_DEFAULT || want_transfer_size) {
+ /* 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;
- cp = xbuf + 2;
goto add_blksize_opt;
}
- /* else: just fall into while (1) loop below */
#endif
- } else {
+ if (CMD_GET(option_mask32)) {
+ /* It's upload and we don't send OACK.
+ * We must ACK 1st packet (with filename)
+ * as if it is "block 0" */
+ block_nr = 0;
+ }
+
+ } else { /* tftp */
+ /* Open file (must be after changing user) */
+ local_fd = CMD_GET(option_mask32) ? STDOUT_FILENO : STDIN_FILENO;
+ if (NOT_LONE_DASH(local_file))
+ local_fd = xopen(local_file, open_mode);
+/* Removing #if, or using if() statement instead of #if may lead to
+ * "warning: null argument where non-null required": */
+#if ENABLE_TFTP
/* tftp */
/* We can't (and don't really need to) bind the socket:
/* build opcode */
opcode = TFTP_WRQ;
- if (CMD_GET(cmd)) {
+ if (CMD_GET(option_mask32)) {
opcode = TFTP_RRQ;
}
- cp = xbuf + 2;
/* add filename and mode */
/* fill in packet if the filename fits into xbuf */
len = strlen(remote_file) + 1;
- if (2 + len + sizeof("octet") >= tftp_bufsize) {
+ if (2 + len + sizeof("octet") >= io_bufsize) {
bb_error_msg("remote filename is too long");
goto ret;
}
strcpy(cp, remote_file);
cp += len;
- /* add "mode" part of the package */
+ /* add "mode" part of the packet */
strcpy(cp, "octet");
cp += sizeof("octet");
+# if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ if (blksize == TFTP_BLKSIZE_DEFAULT && !want_transfer_size)
+ goto send_pkt;
+
+ /* Need to add option to pkt */
+ if ((&xbuf[io_bufsize - 1] - cp) < sizeof("blksize NNNNN tsize ") + sizeof(off_t)*3) {
+ bb_error_msg("remote filename is too long");
+ goto ret;
+ }
+ expect_OACK = 1;
+# endif
+#endif /* ENABLE_TFTP */
+
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
- if (blocksize != TFTP_BLOCKSIZE_DEFAULT) {
- /* rfc2348 says that 65464 is a max allowed value */
- if ((&xbuf[tftp_bufsize - 1] - cp) < sizeof("blksize NNNNN")) {
- bb_error_msg("remote filename is too long");
- goto ret;
- }
- want_option_ack = 1;
add_blksize_opt:
- /* add "blksize", <nul>, blocksize, <nul> */
+ if (blksize != TFTP_BLKSIZE_DEFAULT) {
+ /* add "blksize", <nul>, blksize, <nul> */
strcpy(cp, "blksize");
cp += sizeof("blksize");
- cp += snprintf(cp, 6, "%d", blocksize) + 1;
+ cp += snprintf(cp, 6, "%d", blksize) + 1;
+ }
+ if (want_transfer_size) {
+ /* add "tsize", <nul>, size, <nul> (see RFC2349) */
+ /* if tftp and downloading, we send "0" (since we opened local_fd with O_TRUNC)
+ * and this makes server to send "tsize" option with the size */
+ /* if tftp and uploading, we send file size (maybe dont, to not confuse old servers???) */
+ /* if tftpd and downloading, we are answering to client's request */
+ /* if tftpd and uploading: !want_transfer_size, this code is not executed */
+ struct stat st;
+ strcpy(cp, "tsize");
+ cp += sizeof("tsize");
+ st.st_size = 0;
+ fstat(local_fd, &st);
+ cp += sprintf(cp, "%"OFF_FMT"u", (off_t)st.st_size) + 1;
+# if ENABLE_FEATURE_TFTP_PROGRESS_BAR
+ /* Save for progress bar. If 0 (tftp downloading),
+ * we look at server's reply later */
+ G.size = st.st_size;
+ if (remote_file && st.st_size)
+ tftp_progress_init();
+# endif
}
#endif
/* First packet is built, so skip packet generation */
cp += 2;
block_nr++;
opcode = TFTP_ACK;
- if (CMD_PUT(cmd)) {
+ if (CMD_PUT(option_mask32)) {
opcode = TFTP_DATA;
- len = full_read(local_fd, cp, tftp_bufsize - 4);
+ len = full_read(local_fd, cp, blksize);
if (len < 0) {
- bb_perror_msg(bb_msg_read_error);
- goto ret;
+ goto send_read_err_pkt;
}
- if (len != (tftp_bufsize - 4)) {
+ if (len != blksize) {
finished = 1;
}
cp += len;
+ IF_FEATURE_TFTP_PROGRESS_BAR(G.pos += len;)
}
send_pkt:
/* Send packet */
/* NB: send_len value is preserved in code below
* for potential resend */
- retries = TFTP_NUM_RETRIES; /* re-initialize */
+ retries = TFTP_NUM_RETRIES; /* re-initialize */
waittime_ms = TFTP_TIMEOUT_MS;
send_again:
-#if ENABLE_DEBUG_TFTP
+#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;
/*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, tftp_bufsize, 0,
+ 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.
} else {
/* tftpd, or not the very first packet:
* socket is connect()ed, can just read from it. */
- len = safe_read(socket_fd, rbuf, tftp_bufsize);
+ /* Don't full_read()!
+ * This is not TCP, one read == one pkt! */
+ len = safe_read(socket_fd, rbuf, io_bufsize);
}
if (len < 0) {
- bb_perror_msg("read");
- goto ret;
+ goto send_read_err_pkt;
}
- if (len < 4) /* too small? */
+ if (len < 4) { /* too small? */
goto recv_again;
- goto process_pkt;
- case 0:
- retries--;
- if (retries == 0) {
- bb_error_msg("timeout");
- goto ret;
}
-
- /* 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 */
- default:
- /*bb_perror_msg("poll"); - done in safe_poll */
- goto ret;
}
- process_pkt:
+
/* Process recv'ed packet */
opcode = ntohs( ((uint16_t*)rbuf)[0] );
recv_blk = ntohs( ((uint16_t*)rbuf)[1] );
-
-#if ENABLE_DEBUG_TFTP
+#if ENABLE_TFTP_DEBUG
fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk);
#endif
-
if (opcode == TFTP_ERROR) {
- static const char *const errcode_str[] = {
- "",
- "file not found",
- "access violation",
- "disk full",
- "illegal TFTP operation",
- "unknown transfer id",
- "file already exists",
- "no such user",
- "bad option"
- };
+ 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[tftp_bufsize - 1] = '\0';
- } else if (recv_blk < ARRAY_SIZE(errcode_str)) {
- msg = errcode_str[recv_blk];
+ 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 (want_option_ack) {
- want_option_ack = 0;
-
+ if (expect_OACK) {
+ expect_OACK = 0;
if (opcode == TFTP_OACK) {
/* server seems to support options */
char *res;
- res = tftp_option_get(&rbuf[2], len - 2, "blksize");
+ res = tftp_get_option("blksize", &rbuf[2], len - 2);
if (res) {
- int blksize = xatoi_u(res);
- if (!tftp_blocksize_check(blksize, tftp_bufsize - 4)) {
- /* send ERROR 8 to server... */
- /* htons can be impossible to use in const initializer: */
- /*static const uint16_t error_8[2] = { htons(TFTP_ERROR), htons(8) };*/
- /* thus we open-code big-endian layout */
- static const uint8_t error_8[4] = { 0,TFTP_ERROR, 0,8 };
- xsendto(socket_fd, error_8, 4, &peer_lsa->u.sa, peer_lsa->len);
- bb_error_msg("server proposes bad blksize %d, exiting", blksize);
- goto ret;
+ blksize = tftp_blksize_check(res, blksize);
+ if (blksize < 0) {
+ G_error_pkt_reason = ERR_BAD_OPT;
+ goto send_err_pkt;
}
-#if ENABLE_DEBUG_TFTP
- fprintf(stderr, "using blksize %u\n",
- blksize);
-#endif
- tftp_bufsize = blksize + 4;
- /* Send ACK for OACK ("block" no: 0) */
+ 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." */
+ continue;
}
-
- bb_error_msg("blksize is not supported by server"
- " - reverting to 512");
- tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4;
+ /* 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(cmd) && (opcode == TFTP_DATA)) {
+ if (CMD_GET(option_mask32) && (opcode == TFTP_DATA)) {
if (recv_blk == block_nr) {
- len = full_write(local_fd, &rbuf[4], len - 4);
- if (len < 0) {
- bb_perror_msg(bb_msg_write_error);
- goto ret;
+ 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 (len != (tftp_bufsize - 4)) {
+ 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(cmd) && (opcode == TFTP_ACK)) {
+ 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)
} /* 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 ATTRIBUTE_UNUSED, char **argv)
+int tftp_main(int argc UNUSED_PARAM, char **argv)
{
len_and_sockaddr *peer_lsa;
const char *local_file = NULL;
const char *remote_file = NULL;
- int port;
- USE_GETPUT(int cmd;)
- int local_fd;
- int flags = 0;
+# if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ const char *blksize_str = TFTP_BLKSIZE_DEFAULT_STR;
+ int blksize;
+# endif
int result;
- int blocksize = TFTP_BLOCKSIZE_DEFAULT;
+ int port;
+ IF_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_FEATURE_TFTP_BLOCKSIZE("b+");
+ opt_complementary = "" IF_FEATURE_TFTP_GET("g:") IF_FEATURE_TFTP_PUT("p:")
+ IF_GETPUT("g--p:p--g:");
- USE_GETPUT(cmd =) getopt32(argv,
- USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p")
- "l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"),
+ 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
- USE_FEATURE_TFTP_BLOCKSIZE(, &blocksize));
+ IF_FEATURE_TFTP_BLOCKSIZE(, &blksize_str));
argv += optind;
- flags = O_RDONLY;
- if (CMD_GET(cmd))
- flags = O_WRONLY | O_CREAT | O_TRUNC;
-
-#if ENABLE_FEATURE_TFTP_BLOCKSIZE
- if (!tftp_blocksize_check(blocksize, 0))
+# 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
+ }
+# endif
- if (!local_file)
- local_file = remote_file;
- if (!remote_file)
+ 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();
- local_fd = CMD_GET(cmd) ? STDOUT_FILENO : STDIN_FILENO;
- if (!LONE_DASH(local_file)) {
- local_fd = xopen(local_file, flags);
- }
-
port = bb_lookup_port(argv[1], "udp", 69);
peer_lsa = xhost2sockaddr(argv[0], port);
-#if ENABLE_DEBUG_TFTP
+# 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
+# endif
+# if ENABLE_FEATURE_TFTP_PROGRESS_BAR
+ G.file = remote_file;
+# endif
result = tftp_protocol(
- USE_GETPUT(cmd,)
- NULL /* our_lsa*/,
- peer_lsa,
- remote_file, local_fd, blocksize);
+ 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 (ENABLE_FEATURE_CLEAN_UP)
- close(local_fd);
- if (result != EXIT_SUCCESS && !LONE_DASH(local_file) && CMD_GET(cmd)) {
+ 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)
+int tftpd_main(int argc UNUSED_PARAM, char **argv)
{
- char block_buf[TFTP_BLOCKSIZE_DEFAULT];
len_and_sockaddr *our_lsa;
len_and_sockaddr *peer_lsa;
- char *filename, *mode, *opt_str;
- int opt_r, result, opcode, open_mode, local_fd, blksize;
- USE_GETPUT(int cmd;)
+ 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)
- bb_perror_msg_and_die("stdin is not a socket");
+ 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;
- opt_r = getopt32(argv, "r");
+ /* Shifting to not collide with TFTP_OPTs */
+ opt = option_mask32 = TFTPD_OPT | (getopt32(argv, "rcu:l", &user_opt) << 8);
argv += optind;
- if (argv[0])
- xchdir(argv[0]);
+ 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, block_buf, sizeof(block_buf),
+ result = recv_from_to(STDIN_FILENO, G.block_buf, sizeof(G.block_buf),
0 /* flags */,
&peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len);
- 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 */
+ 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'
+ || (IF_FEATURE_TFTP_PUT(opcode != TFTP_RRQ) /* not download */
+ IF_GETPUT(&&)
+ IF_FEATURE_TFTP_GET(opcode != TFTP_WRQ) /* not upload */
)
) {
- bb_error_msg_and_die("malformed packet");
+ goto err;
}
- filename = block_buf + 2;
- if (filename[0] == '.' || strstr(filename, "/.")) {
- bb_error_msg_and_die("dot in filename");
+ local_file = G.block_buf + 2;
+ if (local_file[0] == '.' || strstr(local_file, "/.")) {
+ error_msg = "dot in file name";
+ goto err;
}
- mode = filename + strlen(filename) + 1;
- if (mode >= block_buf + sizeof(block_buf)
- || strcmp(mode, "octet") != 0
- ) {
- bb_error_msg_and_die("malformed packet");
+ 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;
}
- blksize = TFTP_BLOCKSIZE_DEFAULT;
-#if ENABLE_FEATURE_TFTP_BLOCKSIZE
- opt_str = mode + 6;
- if (opt_str < block_buf + sizeof(block_buf)) {
- char *res = tftp_option_get(opt_str, block_buf + sizeof(block_buf) - opt_str, "blksize");
- if (res) {
- int sz = xatoi_u(res);
- if (tftp_blocksize_check(sz, 0))
- blksize = sz;
+# 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
+# endif
-#if ENABLE_FEATURE_TFTP_PUT
- /* in case opcode is TFTP_RRQ: */
- USE_GETPUT(cmd = 2;) /* CMD_PUT: we will send file's data */
- open_mode = O_RDONLY;
-#endif
-#if ENABLE_FEATURE_TFTP_GET
if (!ENABLE_FEATURE_TFTP_PUT || opcode == TFTP_WRQ) {
- if (opt_r)
- bb_error_msg_and_die("upload is prohibited");
- USE_GETPUT(cmd = 1;) /* CMD_GET: we will receive file's data */
- open_mode = O_WRONLY | O_TRUNC;
+ 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 */
}
-#endif
- local_fd = xopen(filename, open_mode);
+ /* 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(
- USE_GETPUT(cmd,)
our_lsa, peer_lsa,
- USE_TFTP(NULL /*remote_file*/,)
- local_fd,
- blksize
+ 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 */