diff options
| -rw-r--r-- | networking/tftp.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/networking/tftp.c b/networking/tftp.c index 23a24139b..25001c22c 100644 --- a/networking/tftp.c +++ b/networking/tftp.c @@ -16,7 +16,7 @@ * * utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de> * - * tftpd added by Denys Vlasenko + * tftpd added by Denys Vlasenko & Vladimir Dronnikov * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * ------------------------------------------------------------------------- */ @@ -145,9 +145,9 @@ static int tftp_protocol( 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 */ - block_nr = 0; /* Create a socket which is: * 1. bound to IP:port peer sent 1st datagram to, @@ -158,9 +158,17 @@ static int tftp_protocol( 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; + } + #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" */ opcode = TFTP_OACK; cp = xbuf + 2; goto add_blksize_opt; @@ -169,7 +177,6 @@ static int tftp_protocol( #endif } else { /* tftp */ - block_nr = 1; /* We can't (and don't really need to) bind the socket: * we don't know from which local IP datagrams will be sent, @@ -288,6 +295,8 @@ static int tftp_protocol( bb_perror_msg("read"); goto ret; } + if (len < 4) /* too small? */ + goto recv_again; goto process_pkt; case 0: retries--; |