RFC2348, RFC2349: - Option string is case in-sensitive. - Client must generate ERR pkt in case option value mismatch in server OACK - Fix debug print for options
Signed-off-by: Ravik Hasija <[email protected]> --- net/tftp.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 52 insertions(+), 7 deletions(-) diff --git a/net/tftp.c b/net/tftp.c index be24e63075..14621e2441 100644 --- a/net/tftp.c +++ b/net/tftp.c @@ -68,6 +68,7 @@ enum { TFTP_ERR_UNEXPECTED_OPCODE = 4, TFTP_ERR_UNKNOWN_TRANSFER_ID = 5, TFTP_ERR_FILE_ALREADY_EXISTS = 6, + TFTP_ERR_OPTION_NEGOTIATION = 8, }; static struct in_addr tftp_remote_ip; @@ -111,6 +112,7 @@ static int tftp_put_final_block_sent; #define STATE_OACK 5 #define STATE_RECV_WRQ 6 #define STATE_SEND_WRQ 7 +#define STATE_INVALID_OPTION 8 /* default TFTP block size */ #define TFTP_BLOCK_SIZE 512 @@ -313,6 +315,7 @@ static void tftp_send(void) uchar *xp; int len = 0; ushort *s; + bool err_pkt = false; /* * We will always be sending some sort of packet, so @@ -383,6 +386,7 @@ static void tftp_send(void) strcpy((char *)pkt, "File too large"); pkt += 14 /*strlen("File too large")*/ + 1; len = pkt - xp; + err_pkt = true; break; case STATE_BAD_MAGIC: @@ -394,11 +398,28 @@ static void tftp_send(void) strcpy((char *)pkt, "File has bad magic"); pkt += 18 /*strlen("File has bad magic")*/ + 1; len = pkt - xp; + err_pkt = true; + break; + + case STATE_INVALID_OPTION: + xp = pkt; + s = (ushort *)pkt; + *s++ = htons(TFTP_ERROR); + *s++ = htons(TFTP_ERR_OPTION_NEGOTIATION); + pkt = (uchar *)s; + strcpy((char *)pkt, "Option Negotiation Failed"); + /* strlen("Option Negotiation Failed") + NULL*/ + pkt += 25 + 1; + len = pkt - xp; + err_pkt = true; break; } net_send_udp_packet(net_server_ethaddr, tftp_remote_ip, tftp_remote_port, tftp_our_port, len); + + if (err_pkt) + net_set_state(NETLOOP_FAIL); } #ifdef CONFIG_CMD_TFTPPUT @@ -419,6 +440,7 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip, __be16 proto; __be16 *s; int i; + u16 timeout_val_rcvd; if (dest != tftp_our_port) { return; @@ -475,8 +497,14 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip, #endif case TFTP_OACK: - debug("Got OACK: %s %s\n", - pkt, pkt + strlen((char *)pkt) + 1); + debug("Got OACK: "); + for (i = 0; i < len; i++) { + if (pkt[i] == '\0') + debug(" "); + else + debug("%c", pkt[i]); + } + debug("\n"); tftp_state = STATE_OACK; tftp_remote_port = src; /* @@ -485,15 +513,32 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip, * something like "len-8" may give a *huge* number */ for (i = 0; i+8 < len; i++) { - if (strcmp((char *)pkt + i, "blksize") == 0) { + if (strcasecmp((char *)pkt + i, "blksize") == 0) { tftp_block_size = (unsigned short) simple_strtoul((char *)pkt + i + 8, NULL, 10); - debug("Blocksize ack: %s, %d\n", + debug("Blocksize oack: %s, %d\n", (char *)pkt + i + 8, tftp_block_size); + if (tftp_block_size > tftp_block_size_option) { + printf("Invalid blk size(=%d)\n", + tftp_block_size); + tftp_state = STATE_INVALID_OPTION; + } + } + if (strcasecmp((char *)pkt + i, "timeout") == 0) { + timeout_val_rcvd = (unsigned short) + simple_strtoul((char *)pkt + i + 8, + NULL, 10); + debug("Timeout oack: %s, %d\n", + (char *)pkt + i + 8, timeout_val_rcvd); + if (timeout_val_rcvd != (timeout_ms / 1000)) { + printf("Invalid timeout val(=%d s)\n", + timeout_val_rcvd); + tftp_state = STATE_INVALID_OPTION; + } } #ifdef CONFIG_TFTP_TSIZE - if (strcmp((char *)pkt+i, "tsize") == 0) { + if (strcasecmp((char *)pkt + i, "tsize") == 0) { tftp_tsize = simple_strtoul((char *)pkt + i + 6, NULL, 10); debug("size = %s, %d\n", @@ -502,7 +547,7 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip, #endif } #ifdef CONFIG_CMD_TFTPPUT - if (tftp_put_active) { + if (tftp_put_active && tftp_state == STATE_OACK) { /* Get ready to send the first block */ tftp_state = STATE_DATA; tftp_cur_block++; @@ -519,7 +564,7 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip, update_block_number(); if (tftp_state == STATE_SEND_RRQ) - debug("Server did not acknowledge timeout option!\n"); + debug("Server did not acknowledge any options!\n"); if (tftp_state == STATE_SEND_RRQ || tftp_state == STATE_OACK || tftp_state == STATE_RECV_WRQ) { -- 2.17.1
