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/*********************************************************************\
* Copyright (c) 2005 by Radim Kolar (hsn-sendmail.cz) *
* *
* You may copy or modify this file in any manner you wish, provided *
* that this notice is always included, and that you hold the author *
* harmless for any loss or damage resulting from the installation or *
* use of this software. *
* *
* This file provides support for FSP v2 protocol written from scratch *
* by Radim Kolar, FSP project leader. *
* *
* ABOUT FSP *
* FSP is a lightweight file transfer protocol and is being used for *
* booting, Internet firmware updates, embedded devices and in *
* wireless applications. FSP is very easy to implement; contact Radim *
* Kolar if you need hand optimized assembler FSP stacks for various *
* microcontrollers, CPUs or consultations. *
* http://fsp.sourceforge.net/ *
* *
* REVISION HISTORY *
* 1.0 2005-03-17 rkolar Initial coding *
* 1.1 2005-03-24 rkolar We really need to send CC_BYE to the server *
* at end of transfer, because next stage boot *
* loader is unable to contact FSP server *
* until session timeouts. *
* 1.2 2005-03-26 rkolar We need to query filesize in advance, *
* because NBI loader do not reads file until *
* eof is reached.
* REMARKS *
* there is no support for selecting port number of fsp server, maybe *
* we should parse fsp:// URLs in boot image filename. *
* this implementation has filename limit 255 chars. *
\*********************************************************************/
#ifdef DOWNLOAD_PROTO_FSP
#define FSP_PORT 21
/* FSP commands */
#define CC_GET_FILE 0x42
#define CC_BYE 0x4A
#define CC_ERR 0x40
#define CC_STAT 0x4D
/* etherboot limits */
#define FSP_MAXFILENAME 255
struct fsp_info {
in_addr server_ip;
uint16_t server_port;
uint16_t local_port;
const char *filename;
int (*fnc)(unsigned char *, unsigned int, unsigned int, int);
};
struct fsp_header {
uint8_t cmd;
uint8_t sum;
uint16_t key;
uint16_t seq;
uint16_t len;
uint32_t pos;
} PACKED;
#define FSP_MAXPAYLOAD (ETH_MAX_MTU - \
(sizeof(struct iphdr) + sizeof(struct udphdr) + sizeof(struct fsp_header)))
static struct fsp_request {
struct iphdr ip;
struct udphdr udp;
struct fsp_header fsp;
unsigned char data[FSP_MAXFILENAME + 1 + 2];
} request;
struct fsp_reply {
struct iphdr ip;
struct udphdr udp;
struct fsp_header fsp;
unsigned char data[FSP_MAXPAYLOAD];
} PACKED;
static int await_fsp(int ival, void *ptr, unsigned short ptype __unused,
struct iphdr *ip, struct udphdr *udp)
{
if(!udp)
return 0;
if (ip->dest.s_addr != arptable[ARP_CLIENT].ipaddr.s_addr)
return 0;
if (ntohs(udp->dest) != ival)
return 0;
if (ntohs(udp->len) < 12+sizeof(struct udphdr))
return 0;
return 1;
}
static int proto_fsp(struct fsp_info *info)
{
uint32_t filepos;
uint32_t filelength=0;
int i,retry;
uint16_t reqlen;
struct fsp_reply *reply;
int block=1;
/* prepare FSP request packet */
filepos=0;
i=strlen(info->filename);
if(i>FSP_MAXFILENAME)
{
printf("Boot filename is too long.\n");
return 0;
}
strcpy(request.data,info->filename);
*(uint16_t *)(request.data+i+1)=htons(FSP_MAXPAYLOAD);
request.fsp.len=htons(i+1);
reqlen=i+3+12;
rx_qdrain();
retry=0;
/* main loop */
for(;;) {
int sum;
long timeout;
/* query filelength if not known */
if(filelength == 0)
request.fsp.cmd=CC_STAT;
/* prepare request packet */
request.fsp.pos=htonl(filepos);
request.fsp.seq=random();
request.fsp.sum=0;
for(i=0,sum=reqlen;i<reqlen;i++)
{
sum += ((uint8_t *)&request.fsp)[i];
}
request.fsp.sum= sum + (sum >> 8);
/* send request */
if (!udp_transmit(info->server_ip.s_addr, info->local_port,
info->server_port, sizeof(request.ip) +
sizeof(request.udp) + reqlen, &request))
return (0);
/* wait for retry */
#ifdef CONGESTED
timeout =
rfc2131_sleep_interval(filepos ? TFTP_REXMT : TIMEOUT, retry);
#else
timeout = rfc2131_sleep_interval(TIMEOUT, retry);
#endif
retry++;
if (!await_reply(await_fsp, info->local_port, NULL, timeout))
continue;
reply=(struct fsp_reply *) &nic.packet[ETH_HLEN];
/* check received packet */
if (reply->fsp.seq != request.fsp.seq)
continue;
reply->udp.len=ntohs(reply->udp.len)-sizeof(struct udphdr);
if(reply->udp.len < ntohs(reply->fsp.len) + 12 )
continue;
sum=-reply->fsp.sum;
for(i=0;i<reply->udp.len;i++)
{
sum += ((uint8_t *)&(reply->fsp))[i];
}
sum = (sum + (sum >> 8)) & 0xff;
if(sum != reply->fsp.sum)
{
printf("FSP checksum failed. computed %d, but packet has %d.\n",sum,reply->fsp.sum);
continue;
}
if(reply->fsp.cmd == CC_ERR)
{
printf("\nFSP error: %s",info->filename);
if(reply->fsp.len)
printf(" [%s]",reply->data);
printf("\n");
return 0;
}
if(reply->fsp.cmd == CC_BYE && filelength == 1)
{
info->fnc(request.data,block,1,1);
return 1;
}
if(reply->fsp.cmd == CC_STAT)
{
if(reply->data[8] == 0)
{
/* file not found, etc. */
filelength=0xffffffff;
} else
{
filelength= ntohl(*((uint32_t *)&reply->data[4]));
}
request.fsp.cmd = CC_GET_FILE;
request.fsp.key = reply->fsp.key;
retry=0;
continue;
}
if(reply->fsp.cmd == CC_GET_FILE)
{
if(ntohl(reply->fsp.pos) != filepos)
continue;
request.fsp.key = reply->fsp.key;
retry=0;
i=ntohs(reply->fsp.len);
if(i == 1)
{
request.fsp.cmd=CC_BYE;
request.data[0]=reply->data[0];
continue;
}
/* let last byte alone */
if(i >= filelength)
i = filelength - 1;
if(!info->fnc(reply->data,block++,i,0))
return 0;
filepos += i;
filelength -= i;
}
}
return 0;
}
int url_fsp(const char *name, int (*fnc)(unsigned char *, unsigned int, unsigned int, int))
{
struct fsp_info info;
/* Set the defaults */
info.server_ip.s_addr = arptable[ARP_SERVER].ipaddr.s_addr;
info.server_port = FSP_PORT;
info.local_port = 1024 + random() & 0xfbff;
info.fnc = fnc;
/* Now parse the url */
/* printf("fsp-URI: [%s]\n", name); */
/* quick hack for now */
info.filename=name;
return proto_fsp(&info);
}
#endif
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