net: tftp: fix option validation as per RFCs
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 <rahasij@linux.microsoft.com> Reviewed-By: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Ravik Hasija
Tom Rini
parent
46c8b18734
commit
0813921042
59
net/tftp.c
59
net/tftp.c
@ -70,6 +70,7 @@ 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;
|
||||
@ -113,6 +114,7 @@ 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
|
||||
@ -318,6 +320,7 @@ 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
|
||||
@ -388,6 +391,7 @@ 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:
|
||||
@ -399,11 +403,28 @@ 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
|
||||
@ -424,6 +445,7 @@ 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;
|
||||
@ -480,8 +502,14 @@ 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;
|
||||
/*
|
||||
@ -490,15 +518,32 @@ 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",
|
||||
@ -507,7 +552,7 @@ 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++;
|
||||
@ -522,7 +567,7 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
|
||||
tftp_cur_block = ntohs(*(__be16 *)pkt);
|
||||
|
||||
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) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user