8f1bc28408
The TFTP OACK code trusts that the incoming packet is formated as ASCII text and can be processed by string functions. It also has a loop limit overflow bug where if the packet length is less than 8, it ends up looping over *all* of memory to find the 'blksize' string. This patch solves the problem by forcing the packet to be null terminated and using strstr() to search for the sub string. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
618 lines
14 KiB
C
618 lines
14 KiB
C
/*
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* Copyright 1994, 1995, 2000 Neil Russell.
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* (See License)
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* Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
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*/
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#include <common.h>
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#include <command.h>
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#include <net.h>
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#include "tftp.h"
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#include "bootp.h"
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#undef ET_DEBUG
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#if defined(CONFIG_CMD_NET)
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#define WELL_KNOWN_PORT 69 /* Well known TFTP port # */
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#define TIMEOUT 5 /* Seconds to timeout for a lost pkt */
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#ifndef CONFIG_NET_RETRY_COUNT
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# define TIMEOUT_COUNT 10 /* # of timeouts before giving up */
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#else
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# define TIMEOUT_COUNT (CONFIG_NET_RETRY_COUNT * 2)
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#endif
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/* (for checking the image size) */
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#define HASHES_PER_LINE 65 /* Number of "loading" hashes per line */
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/*
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* TFTP operations.
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*/
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#define TFTP_RRQ 1
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#define TFTP_WRQ 2
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#define TFTP_DATA 3
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#define TFTP_ACK 4
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#define TFTP_ERROR 5
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#define TFTP_OACK 6
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static int TftpServerPort; /* The UDP port at their end */
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static int TftpOurPort; /* The UDP port at our end */
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static int TftpTimeoutCount;
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static ulong TftpBlock; /* packet sequence number */
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static ulong TftpLastBlock; /* last packet sequence number received */
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static ulong TftpBlockWrap; /* count of sequence number wraparounds */
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static ulong TftpBlockWrapOffset; /* memory offset due to wrapping */
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static int TftpState;
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#define STATE_RRQ 1
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#define STATE_DATA 2
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#define STATE_TOO_LARGE 3
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#define STATE_BAD_MAGIC 4
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#define STATE_OACK 5
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#define TFTP_BLOCK_SIZE 512 /* default TFTP block size */
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#define TFTP_SEQUENCE_SIZE ((ulong)(1<<16)) /* sequence number is 16 bit */
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#define DEFAULT_NAME_LEN (8 + 4 + 1)
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static char default_filename[DEFAULT_NAME_LEN];
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static char *tftp_filename;
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#ifdef CFG_DIRECT_FLASH_TFTP
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extern flash_info_t flash_info[];
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#endif
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/* 512 is poor choice for ethernet, MTU is typically 1500.
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* Minus eth.hdrs thats 1468. Can get 2x better throughput with
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* almost-MTU block sizes. At least try... fall back to 512 if need be.
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*/
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#define TFTP_MTU_BLOCKSIZE 1468
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static unsigned short TftpBlkSize=TFTP_BLOCK_SIZE;
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static unsigned short TftpBlkSizeOption=TFTP_MTU_BLOCKSIZE;
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#ifdef CONFIG_MCAST_TFTP
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#include <malloc.h>
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#define MTFTP_BITMAPSIZE 0x1000
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static unsigned *Bitmap;
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static int PrevBitmapHole,Mapsize=MTFTP_BITMAPSIZE;
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static uchar ProhibitMcast=0, MasterClient=0;
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static uchar Multicast=0;
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extern IPaddr_t Mcast_addr;
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static int Mcast_port;
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static ulong TftpEndingBlock; /* can get 'last' block before done..*/
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static void parse_multicast_oack(char *pkt,int len);
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static void
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mcast_cleanup(void)
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{
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if (Mcast_addr) eth_mcast_join(Mcast_addr, 0);
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if (Bitmap) free(Bitmap);
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Bitmap=NULL;
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Mcast_addr = Multicast = Mcast_port = 0;
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TftpEndingBlock = -1;
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}
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#endif /* CONFIG_MCAST_TFTP */
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static __inline__ void
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store_block (unsigned block, uchar * src, unsigned len)
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{
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ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
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ulong newsize = offset + len;
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#ifdef CFG_DIRECT_FLASH_TFTP
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int i, rc = 0;
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for (i=0; i<CFG_MAX_FLASH_BANKS; i++) {
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/* start address in flash? */
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if (load_addr + offset >= flash_info[i].start[0]) {
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rc = 1;
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break;
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}
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}
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if (rc) { /* Flash is destination for this packet */
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rc = flash_write ((char *)src, (ulong)(load_addr+offset), len);
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if (rc) {
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flash_perror (rc);
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NetState = NETLOOP_FAIL;
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return;
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}
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}
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else
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#endif /* CFG_DIRECT_FLASH_TFTP */
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{
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(void)memcpy((void *)(load_addr + offset), src, len);
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}
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast)
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ext2_set_bit(block, Bitmap);
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#endif
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if (NetBootFileXferSize < newsize)
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NetBootFileXferSize = newsize;
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}
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static void TftpSend (void);
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static void TftpTimeout (void);
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/**********************************************************************/
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static void
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TftpSend (void)
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{
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volatile uchar * pkt;
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volatile uchar * xp;
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int len = 0;
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volatile ushort *s;
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#ifdef CONFIG_MCAST_TFTP
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/* Multicast TFTP.. non-MasterClients do not ACK data. */
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if (Multicast
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&& (TftpState == STATE_DATA)
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&& (MasterClient == 0))
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return;
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#endif
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/*
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* We will always be sending some sort of packet, so
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* cobble together the packet headers now.
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*/
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pkt = NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
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switch (TftpState) {
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case STATE_RRQ:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_RRQ);
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pkt = (uchar *)s;
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strcpy ((char *)pkt, tftp_filename);
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pkt += strlen(tftp_filename) + 1;
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strcpy ((char *)pkt, "octet");
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pkt += 5 /*strlen("octet")*/ + 1;
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strcpy ((char *)pkt, "timeout");
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pkt += 7 /*strlen("timeout")*/ + 1;
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sprintf((char *)pkt, "%d", TIMEOUT);
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#ifdef ET_DEBUG
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printf("send option \"timeout %s\"\n", (char *)pkt);
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#endif
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pkt += strlen((char *)pkt) + 1;
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/* try for more effic. blk size */
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pkt += sprintf((char *)pkt,"blksize%c%d%c",
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0,TftpBlkSizeOption,0);
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#ifdef CONFIG_MCAST_TFTP
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/* Check all preconditions before even trying the option */
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if (!ProhibitMcast
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&& (Bitmap=malloc(Mapsize))
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&& eth_get_dev()->mcast) {
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free(Bitmap);
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Bitmap=NULL;
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pkt += sprintf((char *)pkt,"multicast%c%c",0,0);
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}
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#endif /* CONFIG_MCAST_TFTP */
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len = pkt - xp;
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break;
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case STATE_OACK:
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#ifdef CONFIG_MCAST_TFTP
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/* My turn! Start at where I need blocks I missed.*/
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if (Multicast)
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TftpBlock=ext2_find_next_zero_bit(Bitmap,(Mapsize*8),0);
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/*..falling..*/
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#endif
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case STATE_DATA:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_ACK);
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*s++ = htons(TftpBlock);
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pkt = (uchar *)s;
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len = pkt - xp;
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break;
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case STATE_TOO_LARGE:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_ERROR);
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*s++ = htons(3);
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pkt = (uchar *)s;
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strcpy ((char *)pkt, "File too large");
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pkt += 14 /*strlen("File too large")*/ + 1;
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len = pkt - xp;
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break;
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case STATE_BAD_MAGIC:
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xp = pkt;
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s = (ushort *)pkt;
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*s++ = htons(TFTP_ERROR);
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*s++ = htons(2);
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pkt = (uchar *)s;
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strcpy ((char *)pkt, "File has bad magic");
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pkt += 18 /*strlen("File has bad magic")*/ + 1;
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len = pkt - xp;
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break;
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}
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NetSendUDPPacket(NetServerEther, NetServerIP, TftpServerPort, TftpOurPort, len);
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}
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static void
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TftpHandler (uchar * pkt, unsigned dest, unsigned src, unsigned len)
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{
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char * blksize;
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ushort proto;
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ushort *s;
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if (dest != TftpOurPort) {
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast
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&& (!Mcast_port || (dest != Mcast_port)))
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#endif
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return;
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}
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if (TftpState != STATE_RRQ && src != TftpServerPort) {
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return;
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}
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if (len < 2) {
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return;
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}
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len -= 2;
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/* warning: don't use increment (++) in ntohs() macros!! */
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s = (ushort *)pkt;
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proto = *s++;
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pkt = (uchar *)s;
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switch (ntohs(proto)) {
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case TFTP_RRQ:
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case TFTP_WRQ:
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case TFTP_ACK:
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break;
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default:
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break;
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case TFTP_OACK:
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#ifdef ET_DEBUG
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printf("Got OACK:\n");
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print_buffer (0, pkt, 1, len, 16);
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#endif
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TftpState = STATE_OACK;
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TftpServerPort = src;
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/* Check for 'blksize' option */
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pkt[len] = 0; /* NULL terminate so string ops work */
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blksize = strstr((char*)pkt, "blksize");
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if ((blksize) && (blksize + 8 < (char*)pkt + len)) {
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TftpBlkSize = simple_strtoul(blksize + 8, NULL, 10);
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#ifdef ET_DEBUG
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printf("Blocksize ack: %d\n", TftpBlkSize);
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#endif
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}
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#ifdef CONFIG_MCAST_TFTP
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parse_multicast_oack((char *)pkt,len-1);
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if ((Multicast) && (!MasterClient))
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TftpState = STATE_DATA; /* passive.. */
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else
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#endif
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TftpSend (); /* Send ACK */
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break;
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case TFTP_DATA:
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if (len < 2)
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return;
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len -= 2;
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TftpBlock = ntohs(*(ushort *)pkt);
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/*
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* RFC1350 specifies that the first data packet will
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* have sequence number 1. If we receive a sequence
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* number of 0 this means that there was a wrap
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* around of the (16 bit) counter.
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*/
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if (TftpBlock == 0) {
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TftpBlockWrap++;
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TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
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printf ("\n\t %lu MB received\n\t ", TftpBlockWrapOffset>>20);
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} else {
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if (((TftpBlock - 1) % 10) == 0) {
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putc ('#');
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} else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0) {
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puts ("\n\t ");
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}
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}
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#ifdef ET_DEBUG
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if (TftpState == STATE_RRQ) {
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puts ("Server did not acknowledge timeout option!\n");
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}
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#endif
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if (TftpState == STATE_RRQ || TftpState == STATE_OACK) {
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/* first block received */
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TftpState = STATE_DATA;
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TftpServerPort = src;
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TftpLastBlock = 0;
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TftpBlockWrap = 0;
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TftpBlockWrapOffset = 0;
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast) { /* start!=1 common if mcast */
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TftpLastBlock = TftpBlock - 1;
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} else
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#endif
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if (TftpBlock != 1) { /* Assertion */
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printf ("\nTFTP error: "
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"First block is not block 1 (%ld)\n"
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"Starting again\n\n",
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TftpBlock);
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NetStartAgain ();
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break;
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}
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}
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if (TftpBlock == TftpLastBlock) {
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/*
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* Same block again; ignore it.
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*/
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break;
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}
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TftpLastBlock = TftpBlock;
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NetSetTimeout (TIMEOUT * CFG_HZ, TftpTimeout);
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store_block (TftpBlock - 1, pkt + 2, len);
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/*
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* Acknoledge the block just received, which will prompt
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* the server for the next one.
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*/
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#ifdef CONFIG_MCAST_TFTP
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/* if I am the MasterClient, actively calculate what my next
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* needed block is; else I'm passive; not ACKING
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*/
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if (Multicast) {
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if (len < TftpBlkSize) {
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TftpEndingBlock = TftpBlock;
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} else if (MasterClient) {
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TftpBlock = PrevBitmapHole =
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ext2_find_next_zero_bit(
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Bitmap,
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(Mapsize*8),
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PrevBitmapHole);
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if (TftpBlock > ((Mapsize*8) - 1)) {
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printf ("tftpfile too big\n");
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/* try to double it and retry */
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Mapsize<<=1;
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mcast_cleanup();
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NetStartAgain ();
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return;
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}
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TftpLastBlock = TftpBlock;
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}
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}
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#endif
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TftpSend ();
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#ifdef CONFIG_MCAST_TFTP
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if (Multicast) {
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if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
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puts ("\nMulticast tftp done\n");
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mcast_cleanup();
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NetState = NETLOOP_SUCCESS;
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}
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}
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else
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#endif
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if (len < TftpBlkSize) {
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/*
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* We received the whole thing. Try to
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* run it.
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*/
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puts ("\ndone\n");
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NetState = NETLOOP_SUCCESS;
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}
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break;
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case TFTP_ERROR:
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printf ("\nTFTP error: '%s' (%d)\n",
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pkt + 2, ntohs(*(ushort *)pkt));
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puts ("Starting again\n\n");
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#ifdef CONFIG_MCAST_TFTP
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mcast_cleanup();
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#endif
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NetStartAgain ();
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break;
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}
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}
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static void
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TftpTimeout (void)
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{
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if (++TftpTimeoutCount > TIMEOUT_COUNT) {
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puts ("\nRetry count exceeded; starting again\n");
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#ifdef CONFIG_MCAST_TFTP
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mcast_cleanup();
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#endif
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NetStartAgain ();
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} else {
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puts ("T ");
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NetSetTimeout (TIMEOUT * CFG_HZ, TftpTimeout);
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TftpSend ();
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}
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}
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void
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TftpStart (void)
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{
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#ifdef CONFIG_TFTP_PORT
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char *ep; /* Environment pointer */
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#endif
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if (BootFile[0] == '\0') {
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sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
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NetOurIP & 0xFF,
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(NetOurIP >> 8) & 0xFF,
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(NetOurIP >> 16) & 0xFF,
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(NetOurIP >> 24) & 0xFF );
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tftp_filename = default_filename;
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printf ("*** Warning: no boot file name; using '%s'\n",
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tftp_filename);
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} else {
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tftp_filename = BootFile;
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}
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#if defined(CONFIG_NET_MULTI)
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printf ("Using %s device\n", eth_get_name());
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#endif
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puts ("TFTP from server "); print_IPaddr (NetServerIP);
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puts ("; our IP address is "); print_IPaddr (NetOurIP);
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/* Check if we need to send across this subnet */
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if (NetOurGatewayIP && NetOurSubnetMask) {
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IPaddr_t OurNet = NetOurIP & NetOurSubnetMask;
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IPaddr_t ServerNet = NetServerIP & NetOurSubnetMask;
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if (OurNet != ServerNet) {
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puts ("; sending through gateway ");
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print_IPaddr (NetOurGatewayIP) ;
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}
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}
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putc ('\n');
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printf ("Filename '%s'.", tftp_filename);
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if (NetBootFileSize) {
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printf (" Size is 0x%x Bytes = ", NetBootFileSize<<9);
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print_size (NetBootFileSize<<9, "");
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}
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putc ('\n');
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printf ("Load address: 0x%lx\n", load_addr);
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puts ("Loading: *\b");
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NetSetTimeout (TIMEOUT * CFG_HZ, TftpTimeout);
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NetSetHandler (TftpHandler);
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TftpServerPort = WELL_KNOWN_PORT;
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TftpTimeoutCount = 0;
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TftpState = STATE_RRQ;
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/* Use a pseudo-random port unless a specific port is set */
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TftpOurPort = 1024 + (get_timer(0) % 3072);
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#ifdef CONFIG_TFTP_PORT
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if ((ep = getenv("tftpdstp")) != NULL) {
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TftpServerPort = simple_strtol(ep, NULL, 10);
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}
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if ((ep = getenv("tftpsrcp")) != NULL) {
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TftpOurPort= simple_strtol(ep, NULL, 10);
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}
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#endif
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TftpBlock = 0;
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/* zero out server ether in case the server ip has changed */
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memset(NetServerEther, 0, 6);
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/* Revert TftpBlkSize to dflt */
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TftpBlkSize = TFTP_BLOCK_SIZE;
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#ifdef CONFIG_MCAST_TFTP
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mcast_cleanup();
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#endif
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TftpSend ();
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}
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#ifdef CONFIG_MCAST_TFTP
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/* Credits: atftp project.
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*/
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/* pick up BcastAddr, Port, and whether I am [now] the master-client. *
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|
* Frame:
|
|
* +-------+-----------+---+-------~~-------+---+
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|
* | opc | multicast | 0 | addr, port, mc | 0 |
|
|
* +-------+-----------+---+-------~~-------+---+
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|
* The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
|
|
* I am the new master-client so must send ACKs to DataBlocks. If I am not
|
|
* master-client, I'm a passive client, gathering what DataBlocks I may and
|
|
* making note of which ones I got in my bitmask.
|
|
* In theory, I never go from master->passive..
|
|
* .. this comes in with pkt already pointing just past opc
|
|
*/
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|
static void parse_multicast_oack(char *pkt, int len)
|
|
{
|
|
int i;
|
|
IPaddr_t addr;
|
|
char *mc_adr, *port, *mc;
|
|
|
|
mc_adr=port=mc=NULL;
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|
/* march along looking for 'multicast\0', which has to start at least
|
|
* 14 bytes back from the end.
|
|
*/
|
|
for (i=0;i<len-14;i++)
|
|
if (strcmp (pkt+i,"multicast") == 0)
|
|
break;
|
|
if (i >= (len-14)) /* non-Multicast OACK, ign. */
|
|
return;
|
|
|
|
i+=10; /* strlen multicast */
|
|
mc_adr = pkt+i;
|
|
for (;i<len;i++) {
|
|
if (*(pkt+i) == ',') {
|
|
*(pkt+i) = '\0';
|
|
if (port) {
|
|
mc = pkt+i+1;
|
|
break;
|
|
} else {
|
|
port = pkt+i+1;
|
|
}
|
|
}
|
|
}
|
|
if (!port || !mc_adr || !mc ) return;
|
|
if (Multicast && MasterClient) {
|
|
printf ("I got a OACK as master Client, WRONG!\n");
|
|
return;
|
|
}
|
|
/* ..I now accept packets destined for this MCAST addr, port */
|
|
if (!Multicast) {
|
|
if (Bitmap) {
|
|
printf ("Internal failure! no mcast.\n");
|
|
free(Bitmap);
|
|
Bitmap=NULL;
|
|
ProhibitMcast=1;
|
|
return ;
|
|
}
|
|
/* I malloc instead of pre-declare; so that if the file ends
|
|
* up being too big for this bitmap I can retry
|
|
*/
|
|
if (!(Bitmap = malloc (Mapsize))) {
|
|
printf ("No Bitmap, no multicast. Sorry.\n");
|
|
ProhibitMcast=1;
|
|
return;
|
|
}
|
|
memset (Bitmap,0,Mapsize);
|
|
PrevBitmapHole = 0;
|
|
Multicast = 1;
|
|
}
|
|
addr = string_to_ip(mc_adr);
|
|
if (Mcast_addr != addr) {
|
|
if (Mcast_addr)
|
|
eth_mcast_join(Mcast_addr, 0);
|
|
if (eth_mcast_join(Mcast_addr=addr, 1)) {
|
|
printf ("Fail to set mcast, revert to TFTP\n");
|
|
ProhibitMcast=1;
|
|
mcast_cleanup();
|
|
NetStartAgain();
|
|
}
|
|
}
|
|
MasterClient = (unsigned char)simple_strtoul((char *)mc,NULL,10);
|
|
Mcast_port = (unsigned short)simple_strtoul(port,NULL,10);
|
|
printf ("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
|
|
return;
|
|
}
|
|
|
|
#endif /* Multicast TFTP */
|
|
|
|
#endif
|