tftp functions moved to proto/tftp.c
This commit is contained in:
Michael Brown
parent
5f45f14b5f
commit
167c26c92b
160
src/core/nic.c
160
src/core/nic.c
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@ -342,7 +342,7 @@ int download_url ( char *url,
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unparse_url ( &url_info );
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/* Call protocol's method to download the file */
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return proto->load ( url, &server, process );
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return proto->load ( url, &server, url_info.file, process );
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error_out:
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unparse_url ( &url_info );
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@ -659,161 +659,6 @@ void rx_qdrain(void)
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}
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#ifdef DOWNLOAD_PROTO_TFTP
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/**************************************************************************
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TFTP - Download extended BOOTP data, or kernel image
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**************************************************************************/
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static int await_tftp(int ival, void *ptr __unused,
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unsigned short ptype __unused, struct iphdr *ip, struct udphdr *udp,
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struct tcphdr *tcp __unused)
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{
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if (!udp) {
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return 0;
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}
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if (arptable[ARP_CLIENT].ipaddr.s_addr != ip->dest.s_addr)
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return 0;
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if (ntohs(udp->dest) != ival)
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return 0;
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return 1;
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}
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int tftp ( const char *name,
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int (*fnc)(unsigned char *, unsigned int, unsigned int, int) )
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{
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struct tftpreq_info_t request_data =
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{ name, TFTP_PORT, TFTP_MAX_PACKET };
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struct tftpreq_info_t *request = &request_data;
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struct tftpblk_info_t block;
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int rc;
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while ( tftp_block ( request, &block ) ) {
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request = NULL; /* Send request only once */
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rc = fnc ( block.data, block.block, block.len, block.eof );
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if ( rc <= 0 ) return (rc);
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if ( block.eof ) {
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/* fnc should not have returned */
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printf ( "TFTP download complete, but\n" );
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return (0);
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}
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}
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return (0);
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}
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int tftp_block ( struct tftpreq_info_t *request, struct tftpblk_info_t *block )
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{
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static unsigned short lport = 2000; /* local port */
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static unsigned short rport = TFTP_PORT; /* remote port */
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struct tftp_t *rcvd = NULL;
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static struct tftpreq_t xmit;
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static unsigned short xmitlen = 0;
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static unsigned short blockidx = 0; /* Last block received */
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static unsigned short retry = 0; /* Retry attempts on last block */
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static int blksize = 0;
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unsigned short recvlen = 0;
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/* If this is a new request (i.e. if name is set), fill in
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* transmit block with RRQ and send it.
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*/
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if ( request ) {
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rx_qdrain(); /* Flush receive queue */
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xmit.opcode = htons(TFTP_RRQ);
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xmitlen = (void*)&xmit.u.rrq - (void*)&xmit +
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sprintf((char*)xmit.u.rrq, "%s%coctet%cblksize%c%d",
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request->name, 0, 0, 0, request->blksize)
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+ 1; /* null terminator */
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blockidx = 0; /* Reset counters */
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retry = 0;
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blksize = TFTP_DEFAULTSIZE_PACKET;
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lport++; /* Use new local port */
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rport = request->port;
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if ( !udp_transmit(arptable[ARP_SERVER].ipaddr.s_addr, lport,
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rport, xmitlen, &xmit) )
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return (0);
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}
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/* Exit if no transfer in progress */
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if ( !blksize ) return (0);
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/* Loop to wait until we get a packet we're interested in */
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block->data = NULL; /* Used as flag */
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while ( block->data == NULL ) {
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long timeout = rfc2131_sleep_interval ( blockidx ? TFTP_REXMT :
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TIMEOUT, retry );
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if ( !await_reply(await_tftp, lport, NULL, timeout) ) {
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/* No packet received */
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if ( retry++ > MAX_TFTP_RETRIES ) break;
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/* Retransmit last packet */
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if ( !blockidx ) lport++; /* New lport if new RRQ */
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if ( !udp_transmit(arptable[ARP_SERVER].ipaddr.s_addr,
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lport, rport, xmitlen, &xmit) )
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return (0);
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continue; /* Back to waiting for packet */
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}
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/* Packet has been received */
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rcvd = (struct tftp_t *)&nic.packet[ETH_HLEN];
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recvlen = ntohs(rcvd->udp.len) - sizeof(struct udphdr)
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- sizeof(rcvd->opcode);
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rport = ntohs(rcvd->udp.src);
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retry = 0; /* Reset retry counter */
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switch ( htons(rcvd->opcode) ) {
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case TFTP_ERROR : {
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printf ( "TFTP error %d (%s)\n",
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ntohs(rcvd->u.err.errcode),
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rcvd->u.err.errmsg );
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return (0); /* abort */
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}
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case TFTP_OACK : {
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const char *p = rcvd->u.oack.data;
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const char *e = p + recvlen - 10; /* "blksize\0\d\0" */
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*((char*)(p+recvlen-1)) = '\0'; /* Force final 0 */
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if ( blockidx || !request ) break; /* Too late */
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if ( recvlen <= TFTP_MAX_PACKET ) /* sanity */ {
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/* Check for blksize option honoured */
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while ( p < e ) {
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if ( strcasecmp("blksize",p) == 0 &&
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p[7] == '\0' ) {
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blksize = strtoul(p+8,&p,10);
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p++; /* skip null */
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}
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while ( *(p++) ) {};
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}
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}
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if ( blksize < TFTP_DEFAULTSIZE_PACKET || blksize > request->blksize ) {
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/* Incorrect blksize - error and abort */
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xmit.opcode = htons(TFTP_ERROR);
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xmit.u.err.errcode = 8;
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xmitlen = (void*)&xmit.u.err.errmsg
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- (void*)&xmit
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+ sprintf((char*)xmit.u.err.errmsg,
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"RFC1782 error")
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+ 1;
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udp_transmit(
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arptable[ARP_SERVER].ipaddr.s_addr,
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lport, rport, xmitlen, &xmit);
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return (0);
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}
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} break;
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case TFTP_DATA :
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if ( ntohs(rcvd->u.data.block) != ( blockidx + 1 ) )
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break; /* Re-ACK last block sent */
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if ( recvlen > ( blksize+sizeof(rcvd->u.data.block) ) )
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break; /* Too large; ignore */
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block->data = rcvd->u.data.download;
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block->block = ++blockidx;
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block->len = recvlen - sizeof(rcvd->u.data.block);
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block->eof = ( (unsigned short)block->len < blksize );
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/* If EOF, zero blksize to indicate transfer done */
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if ( block->eof ) blksize = 0;
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break;
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default: break; /* Do nothing */
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}
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/* Send ACK */
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xmit.opcode = htons(TFTP_ACK);
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xmit.u.ack.block = htons(blockidx);
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xmitlen = TFTP_MIN_PACKET;
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udp_transmit ( arptable[ARP_SERVER].ipaddr.s_addr,
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lport, rport, xmitlen, &xmit );
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}
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return ( block->data ? 1 : 0 );
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}
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#endif /* DOWNLOAD_PROTO_TFTP */
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#ifdef RARP_NOT_BOOTP
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@ -1778,7 +1623,8 @@ int decode_rfc1533(unsigned char *p, unsigned int block, unsigned int len, int e
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memcpy(fname, extpath+2, TAG_LEN(extpath));
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fname[(int)TAG_LEN(extpath)] = '\0';
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printf("Loading BOOTP-extension file: %s\n",fname);
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tftp(fname, decode_rfc1533);
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#warning "BOOTP extension files are broken"
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/* tftp(fname, decode_rfc1533); */
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}
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return 1; /* proceed with next block */
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}
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@ -0,0 +1,174 @@
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#include "etherboot.h"
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#include "in.h"
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#include "nic.h"
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#include "proto.h"
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#include "tftp.h"
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/* Utility function for tftp_block() */
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static int await_tftp ( int ival, void *ptr __unused,
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unsigned short ptype __unused, struct iphdr *ip,
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struct udphdr *udp, struct tcphdr *tcp __unused ) {
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if ( ! udp ) {
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return 0;
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}
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if ( arptable[ARP_CLIENT].ipaddr.s_addr != ip->dest.s_addr )
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return 0;
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if ( ntohs ( udp->dest ) != ival )
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return 0;
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return 1;
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}
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/*
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* Download a single block via TFTP. This function is non-static so
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* that pxe_export.c can call it.
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*
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*/
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int tftp_block ( struct tftpreq_info_t *request,
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struct tftpblk_info_t *block ) {
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static struct sockaddr_in server;
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static unsigned short lport = 2000; /* local port */
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struct tftp_t *rcvd = NULL;
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static struct tftpreq_t xmit;
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static unsigned short xmitlen = 0;
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static unsigned short blockidx = 0; /* Last block received */
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static unsigned short retry = 0; /* Retry attempts on last block */
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static int blksize = 0;
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unsigned short recvlen = 0;
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/* If this is a new request (i.e. if name is set), fill in
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* transmit block with RRQ and send it.
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*/
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if ( request ) {
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rx_qdrain(); /* Flush receive queue */
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xmit.opcode = htons(TFTP_RRQ);
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xmitlen = (void*)&xmit.u.rrq - (void*)&xmit +
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sprintf((char*)xmit.u.rrq, "%s%coctet%cblksize%c%d",
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request->name, 0, 0, 0, request->blksize)
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+ 1; /* null terminator */
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blockidx = 0; /* Reset counters */
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retry = 0;
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blksize = TFTP_DEFAULTSIZE_PACKET;
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lport++; /* Use new local port */
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server = *(request->server);
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if ( ! server.sin_port )
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server.sin_port = TFTP_PORT;
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if ( !udp_transmit(server.sin_addr.s_addr, lport,
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server.sin_port, xmitlen, &xmit) )
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return (0);
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}
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/* Exit if no transfer in progress */
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if ( !blksize ) return (0);
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/* Loop to wait until we get a packet we're interested in */
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block->data = NULL; /* Used as flag */
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while ( block->data == NULL ) {
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long timeout = rfc2131_sleep_interval ( blockidx ? TFTP_REXMT :
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TIMEOUT, retry );
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if ( !await_reply(await_tftp, lport, NULL, timeout) ) {
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/* No packet received */
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if ( retry++ > MAX_TFTP_RETRIES ) break;
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/* Retransmit last packet */
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if ( !blockidx ) lport++; /* New lport if new RRQ */
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if ( !udp_transmit(server.sin_addr.s_addr, lport,
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server.sin_port, xmitlen, &xmit) )
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return (0);
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continue; /* Back to waiting for packet */
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}
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/* Packet has been received */
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rcvd = (struct tftp_t *)&nic.packet[ETH_HLEN];
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recvlen = ntohs(rcvd->udp.len) - sizeof(struct udphdr)
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- sizeof(rcvd->opcode);
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server.sin_port = ntohs(rcvd->udp.src);
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retry = 0; /* Reset retry counter */
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switch ( htons(rcvd->opcode) ) {
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case TFTP_ERROR : {
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printf ( "TFTP error %d (%s)\n",
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ntohs(rcvd->u.err.errcode),
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rcvd->u.err.errmsg );
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return (0); /* abort */
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}
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case TFTP_OACK : {
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const char *p = rcvd->u.oack.data;
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const char *e = p + recvlen - 10; /* "blksize\0\d\0" */
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*((char*)(p+recvlen-1)) = '\0'; /* Force final 0 */
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if ( blockidx || !request ) break; /* Too late */
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if ( recvlen <= TFTP_MAX_PACKET ) /* sanity */ {
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/* Check for blksize option honoured */
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while ( p < e ) {
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if ( strcasecmp("blksize",p) == 0 &&
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p[7] == '\0' ) {
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blksize = strtoul(p+8,&p,10);
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p++; /* skip null */
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}
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while ( *(p++) ) {};
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}
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}
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if ( blksize < TFTP_DEFAULTSIZE_PACKET ||
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blksize > request->blksize ) {
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/* Incorrect blksize - error and abort */
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xmit.opcode = htons(TFTP_ERROR);
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xmit.u.err.errcode = 8;
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xmitlen = (void*)&xmit.u.err.errmsg
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- (void*)&xmit
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+ sprintf((char*)xmit.u.err.errmsg,
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"RFC1782 error")
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+ 1;
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udp_transmit(server.sin_addr.s_addr, lport,
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server.sin_port, xmitlen, &xmit);
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return (0);
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}
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} break;
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case TFTP_DATA :
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if ( ntohs(rcvd->u.data.block) != ( blockidx + 1 ) )
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break; /* Re-ACK last block sent */
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if ( recvlen > ( blksize+sizeof(rcvd->u.data.block) ) )
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break; /* Too large; ignore */
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block->data = rcvd->u.data.download;
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block->block = ++blockidx;
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block->len = recvlen - sizeof(rcvd->u.data.block);
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block->eof = ( (unsigned short)block->len < blksize );
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/* If EOF, zero blksize to indicate transfer done */
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if ( block->eof ) blksize = 0;
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break;
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default: break; /* Do nothing */
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}
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/* Send ACK */
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xmit.opcode = htons(TFTP_ACK);
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xmit.u.ack.block = htons(blockidx);
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xmitlen = TFTP_MIN_PACKET;
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udp_transmit ( server.sin_addr.s_addr, lport, server.sin_port,
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xmitlen, &xmit );
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}
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return ( block->data ? 1 : 0 );
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}
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/*
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* Download a file via TFTP
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*
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*/
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int tftp ( char *url __unused,
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struct sockaddr_in *server,
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char *file,
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int ( * process ) ( unsigned char *data,
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unsigned int blocknum,
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unsigned int len, int eof ) ) {
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struct tftpreq_info_t request_data = {
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.server = server,
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.name = file,
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.blksize = TFTP_MAX_PACKET,
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};
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struct tftpreq_info_t *request = &request_data;
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struct tftpblk_info_t block;
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int rc;
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while ( tftp_block ( request, &block ) ) {
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request = NULL; /* Send request only once */
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rc = process ( block.data, block.block, block.len, block.eof );
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if ( rc <= 0 ) return ( rc );
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}
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return 0;
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}
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struct protocol tftp_protocol __default_protocol = {
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"tftp", tftp
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};
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