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tftp[d]: fix block# handling on upload with non-default blocksize

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function                                             old     new   delta
tftp_protocol                                       1590    1618     +28

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Atsushi Nemoto 2009-07-24 22:34:47 +02:00 committed by Denys Vlasenko
parent 0e1b626b9a
commit 330d898e99
1 changed files with 43 additions and 40 deletions
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83
networking/tftp.c
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@ -157,7 +157,7 @@ static char *tftp_get_option(const char *option, char *buf, int len)
#endif
static int tftp_protocol(
len_and_sockaddr *our_lsa,
len_and_sockaddr *our_lsa, /* NULL if tftp, !NULL if tftpd */
len_and_sockaddr *peer_lsa,
const char *local_file
IF_TFTP(, const char *remote_file)
@ -165,10 +165,10 @@ static int tftp_protocol(
IF_FEATURE_TFTP_BLOCKSIZE(, int blksize))
{
#if !ENABLE_TFTP
#define remote_file NULL
# define remote_file NULL
#endif
#if !(ENABLE_FEATURE_TFTP_BLOCKSIZE && ENABLE_TFTPD)
#define tsize NULL
# define tsize NULL
#endif
#if !ENABLE_FEATURE_TFTP_BLOCKSIZE
enum { blksize = TFTP_BLKSIZE_DEFAULT };
@ -178,7 +178,7 @@ static int tftp_protocol(
#define socket_fd (pfd[0].fd)
int len;
int send_len;
IF_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;
@ -188,21 +188,18 @@ static int tftp_protocol(
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 */
* 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 - 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;
cp = xbuf + 2;
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
@ -216,19 +213,13 @@ static int tftp_protocol(
if (error_pkt_reason || error_pkt_str[0])
goto send_err_pkt;
if (CMD_GET(option_mask32)) {
/* it's upload - we must ACK 1st packet (with filename)
* as if it's "block 0" */
block_nr = 0;
}
if (user_opt) {
struct passwd *pw = xgetpwnam(user_opt);
change_identity(pw); /* initgroups, setgid, setuid */
}
}
/* Open local file (must be after changing user) */
/* Prepare open mode */
if (CMD_PUT(option_mask32)) {
open_mode = O_RDONLY;
} else {
@ -240,20 +231,18 @@ static int tftp_protocol(
}
#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 {
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);
if (local_fd < 0) {
error_pkt_reason = ERR_NOFILE;
strcpy((char*)error_pkt_str, "can't open file");
goto send_err_pkt;
}
}
if (!ENABLE_TFTP || our_lsa) {
/* gcc 4.3.1 would NOT optimize it out as it should! */
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
if (blksize != TFTP_BLKSIZE_DEFAULT || tsize) {
@ -265,8 +254,19 @@ static int tftp_protocol(
goto add_blksize_opt;
}
#endif
} else {
/* Removing it, or using if() statement instead of #if may lead to
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 */
@ -309,7 +309,7 @@ static int tftp_protocol(
bb_error_msg("remote filename is too long");
goto ret;
}
want_option_ack = 1;
expect_OACK = 1;
#endif
#endif /* ENABLE_TFTP */
@ -457,8 +457,8 @@ static int tftp_protocol(
}
#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;
@ -471,15 +471,18 @@ static int tftp_protocol(
goto send_err_pkt;
}
io_bufsize = blksize + 4;
/* Send ACK for OACK ("block" no: 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 (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." */
bb_error_msg("server only supports blocksize of 512");
blksize = TFTP_BLKSIZE_DEFAULT;
io_bufsize = TFTP_BLKSIZE_DEFAULT + 4;