617 lines
19 KiB
C
617 lines
19 KiB
C
#if 0
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#include <gpxe/init.h>
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#include <gpxe/in.h>
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/* NOTE: the NFS code is heavily inspired by the NetBSD netboot code (read:
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* large portions are copied verbatim) as distributed in OSKit 0.97. A few
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* changes were necessary to adapt the code to Etherboot and to fix several
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* inconsistencies. Also the RPC message preparation is done "by hand" to
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* avoid adding netsprintf() which I find hard to understand and use. */
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/* NOTE 2: Etherboot does not care about things beyond the kernel image, so
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* it loads the kernel image off the boot server (ARP_SERVER) and does not
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* access the client root disk (root-path in dhcpd.conf), which would use
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* ARP_ROOTSERVER. The root disk is something the operating system we are
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* about to load needs to use. This is different from the OSKit 0.97 logic. */
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/* NOTE 3: Symlink handling introduced by Anselm M Hoffmeister, 2003-July-14
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* If a symlink is encountered, it is followed as far as possible (recursion
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* possible, maximum 16 steps). There is no clearing of ".."'s inside the
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* path, so please DON'T DO THAT. thx. */
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#define START_OPORT 700 /* mountd usually insists on secure ports */
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#define OPORT_SWEEP 200 /* make sure we don't leave secure range */
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static int oport = START_OPORT;
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static struct sockaddr_in mount_server;
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static struct sockaddr_in nfs_server;
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static unsigned long rpc_id;
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/**************************************************************************
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RPC_INIT - set up the ID counter to something fairly random
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**************************************************************************/
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void rpc_init(void)
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{
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unsigned long t;
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t = currticks();
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rpc_id = t ^ (t << 8) ^ (t << 16);
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}
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/**************************************************************************
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RPC_PRINTERROR - Print a low level RPC error message
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**************************************************************************/
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static void rpc_printerror(struct rpc_t *rpc)
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{
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if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
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rpc->u.reply.astatus) {
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/* rpc_printerror() is called for any RPC related error,
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* suppress output if no low level RPC error happened. */
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DBG("RPC error: (%ld,%ld,%ld)\n", ntohl(rpc->u.reply.rstatus),
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ntohl(rpc->u.reply.verifier),
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ntohl(rpc->u.reply.astatus));
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}
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}
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/**************************************************************************
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AWAIT_RPC - Wait for an rpc packet
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**************************************************************************/
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static int await_rpc(int ival, void *ptr,
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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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{
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struct rpc_t *rpc;
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if (!udp)
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return 0;
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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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if (nic.packetlen < ETH_HLEN + sizeof(struct iphdr) + sizeof(struct udphdr) + 8)
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return 0;
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rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
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if (*(unsigned long *)ptr != ntohl(rpc->u.reply.id))
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return 0;
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if (MSG_REPLY != ntohl(rpc->u.reply.type))
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return 0;
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return 1;
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}
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/**************************************************************************
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RPC_LOOKUP - Lookup RPC Port numbers
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**************************************************************************/
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static int rpc_lookup(struct sockaddr_in *addr, int prog, int ver, int sport)
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{
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struct rpc_t buf, *rpc;
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unsigned long id;
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int retries;
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long *p;
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id = rpc_id++;
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buf.u.call.id = htonl(id);
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buf.u.call.type = htonl(MSG_CALL);
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buf.u.call.rpcvers = htonl(2); /* use RPC version 2 */
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buf.u.call.prog = htonl(PROG_PORTMAP);
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buf.u.call.vers = htonl(2); /* portmapper is version 2 */
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buf.u.call.proc = htonl(PORTMAP_GETPORT);
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p = (long *)buf.u.call.data;
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*p++ = 0; *p++ = 0; /* auth credential */
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*p++ = 0; *p++ = 0; /* auth verifier */
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*p++ = htonl(prog);
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*p++ = htonl(ver);
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*p++ = htonl(IP_UDP);
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*p++ = 0;
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for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
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long timeout;
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udp_transmit(addr->sin_addr.s_addr, sport, addr->sin_port,
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(char *)p - (char *)&buf, &buf);
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timeout = rfc2131_sleep_interval(TIMEOUT, retries);
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if (await_reply(await_rpc, sport, &id, timeout)) {
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rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
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if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
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rpc->u.reply.astatus) {
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rpc_printerror(rpc);
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return 0;
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} else {
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return ntohl(rpc->u.reply.data[0]);
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}
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}
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}
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return 0;
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}
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/**************************************************************************
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RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
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**************************************************************************/
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static long *rpc_add_credentials(long *p)
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{
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int hl;
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/* Here's the executive summary on authentication requirements of the
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* various NFS server implementations: Linux accepts both AUTH_NONE
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* and AUTH_UNIX authentication (also accepts an empty hostname field
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* in the AUTH_UNIX scheme). *BSD refuses AUTH_NONE, but accepts
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* AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
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* scheme). To be safe, use AUTH_UNIX and pass the hostname if we have
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* it (if the BOOTP/DHCP reply didn't give one, just use an empty
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* hostname). */
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hl = (hostnamelen + 3) & ~3;
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/* Provide an AUTH_UNIX credential. */
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*p++ = htonl(1); /* AUTH_UNIX */
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*p++ = htonl(hl+20); /* auth length */
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*p++ = htonl(0); /* stamp */
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*p++ = htonl(hostnamelen); /* hostname string */
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if (hostnamelen & 3) {
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*(p + hostnamelen / 4) = 0; /* add zero padding */
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}
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memcpy(p, hostname, hostnamelen);
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p += hl / 4;
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*p++ = 0; /* uid */
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*p++ = 0; /* gid */
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*p++ = 0; /* auxiliary gid list */
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/* Provide an AUTH_NONE verifier. */
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*p++ = 0; /* AUTH_NONE */
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*p++ = 0; /* auth length */
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return p;
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}
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/**************************************************************************
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NFS_PRINTERROR - Print a NFS error message
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**************************************************************************/
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static void nfs_printerror(int err)
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{
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switch (-err) {
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case NFSERR_PERM:
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printf("Not owner\n");
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break;
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case NFSERR_NOENT:
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printf("No such file or directory\n");
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break;
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case NFSERR_ACCES:
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printf("Permission denied\n");
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break;
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case NFSERR_ISDIR:
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printf("Directory given where filename expected\n");
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break;
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case NFSERR_INVAL:
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printf("Invalid filehandle\n");
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break; // INVAL is not defined in NFSv2, some NFS-servers
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// seem to use it in answers to v2 nevertheless.
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case 9998:
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printf("low-level RPC failure (parameter decoding problem?)\n");
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break;
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case 9999:
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printf("low-level RPC failure (authentication problem?)\n");
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break;
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default:
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printf("Unknown NFS error %d\n", -err);
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}
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}
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/**************************************************************************
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NFS_MOUNT - Mount an NFS Filesystem
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**************************************************************************/
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static int nfs_mount(struct sockaddr_in *server, char *path, char *fh, int sport)
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{
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struct rpc_t buf, *rpc;
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unsigned long id;
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int retries;
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long *p;
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int pathlen = strlen(path);
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id = rpc_id++;
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buf.u.call.id = htonl(id);
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buf.u.call.type = htonl(MSG_CALL);
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buf.u.call.rpcvers = htonl(2); /* use RPC version 2 */
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buf.u.call.prog = htonl(PROG_MOUNT);
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buf.u.call.vers = htonl(1); /* mountd is version 1 */
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buf.u.call.proc = htonl(MOUNT_ADDENTRY);
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p = rpc_add_credentials((long *)buf.u.call.data);
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*p++ = htonl(pathlen);
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if (pathlen & 3) {
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*(p + pathlen / 4) = 0; /* add zero padding */
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}
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memcpy(p, path, pathlen);
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p += (pathlen + 3) / 4;
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for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
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long timeout;
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udp_transmit(server->sin_addr.s_addr, sport, server->sin_port,
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(char *)p - (char *)&buf, &buf);
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timeout = rfc2131_sleep_interval(TIMEOUT, retries);
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if (await_reply(await_rpc, sport, &id, timeout)) {
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rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
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if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
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rpc->u.reply.astatus || rpc->u.reply.data[0]) {
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rpc_printerror(rpc);
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if (rpc->u.reply.rstatus) {
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/* RPC failed, no verifier, data[0] */
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return -9999;
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}
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if (rpc->u.reply.astatus) {
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/* RPC couldn't decode parameters */
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return -9998;
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}
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return -ntohl(rpc->u.reply.data[0]);
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} else {
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memcpy(fh, rpc->u.reply.data + 1, NFS_FHSIZE);
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return 0;
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}
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}
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}
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return -1;
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}
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/**************************************************************************
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NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
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**************************************************************************/
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static void nfs_umountall(struct sockaddr_in *server)
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{
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struct rpc_t buf, *rpc;
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unsigned long id;
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int retries;
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long *p;
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id = rpc_id++;
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buf.u.call.id = htonl(id);
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buf.u.call.type = htonl(MSG_CALL);
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buf.u.call.rpcvers = htonl(2); /* use RPC version 2 */
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buf.u.call.prog = htonl(PROG_MOUNT);
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buf.u.call.vers = htonl(1); /* mountd is version 1 */
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buf.u.call.proc = htonl(MOUNT_UMOUNTALL);
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p = rpc_add_credentials((long *)buf.u.call.data);
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for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
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long timeout = rfc2131_sleep_interval(TIMEOUT, retries);
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udp_transmit(server->sin_addr.s_addr, oport, server->sin_port,
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(char *)p - (char *)&buf, &buf);
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if (await_reply(await_rpc, oport, &id, timeout)) {
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rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
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if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
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rpc->u.reply.astatus) {
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rpc_printerror(rpc);
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}
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break;
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}
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}
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}
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/**************************************************************************
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NFS_RESET - Reset the NFS subsystem
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**************************************************************************/
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static void nfs_reset ( void ) {
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/* If we have a mount server, call nfs_umountall() */
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if ( mount_server.sin_addr.s_addr ) {
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nfs_umountall ( &mount_server );
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}
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/* Zero the data structures */
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memset ( &mount_server, 0, sizeof ( mount_server ) );
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memset ( &nfs_server, 0, sizeof ( nfs_server ) );
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}
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/***************************************************************************
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* NFS_READLINK (AH 2003-07-14)
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* This procedure is called when read of the first block fails -
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* this probably happens when it's a directory or a symlink
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* In case of successful readlink(), the dirname is manipulated,
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* so that inside the nfs() function a recursion can be done.
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**************************************************************************/
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static int nfs_readlink(struct sockaddr_in *server, char *fh __unused,
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char *path, char *nfh, int sport)
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{
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struct rpc_t buf, *rpc;
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unsigned long id;
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long *p;
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int retries;
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int pathlen = strlen(path);
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id = rpc_id++;
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buf.u.call.id = htonl(id);
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buf.u.call.type = htonl(MSG_CALL);
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buf.u.call.rpcvers = htonl(2); /* use RPC version 2 */
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buf.u.call.prog = htonl(PROG_NFS);
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buf.u.call.vers = htonl(2); /* nfsd is version 2 */
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buf.u.call.proc = htonl(NFS_READLINK);
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p = rpc_add_credentials((long *)buf.u.call.data);
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memcpy(p, nfh, NFS_FHSIZE);
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p += (NFS_FHSIZE / 4);
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for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
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long timeout = rfc2131_sleep_interval(TIMEOUT, retries);
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udp_transmit(server->sin_addr.s_addr, sport, server->sin_port,
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(char *)p - (char *)&buf, &buf);
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if (await_reply(await_rpc, sport, &id, timeout)) {
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rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
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if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
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rpc->u.reply.astatus || rpc->u.reply.data[0]) {
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rpc_printerror(rpc);
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if (rpc->u.reply.rstatus) {
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/* RPC failed, no verifier, data[0] */
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return -9999;
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}
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if (rpc->u.reply.astatus) {
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/* RPC couldn't decode parameters */
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return -9998;
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}
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return -ntohl(rpc->u.reply.data[0]);
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} else {
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// It *is* a link.
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// If it's a relative link, append everything to dirname, filename TOO!
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retries = strlen ( (char *)(&(rpc->u.reply.data[2]) ));
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if ( *((char *)(&(rpc->u.reply.data[2]))) != '/' ) {
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path[pathlen++] = '/';
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while ( ( retries + pathlen ) > 298 ) {
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retries--;
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}
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if ( retries > 0 ) {
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memcpy(path + pathlen, &(rpc->u.reply.data[2]), retries + 1);
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} else { retries = 0; }
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path[pathlen + retries] = 0;
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} else {
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// Else make it the only path.
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if ( retries > 298 ) { retries = 298; }
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memcpy ( path, &(rpc->u.reply.data[2]), retries + 1 );
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path[retries] = 0;
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}
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return 0;
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}
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}
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}
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return -1;
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}
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/**************************************************************************
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NFS_LOOKUP - Lookup Pathname
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**************************************************************************/
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static int nfs_lookup(struct sockaddr_in *server, char *fh, char *path, char *nfh,
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int sport)
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{
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struct rpc_t buf, *rpc;
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unsigned long id;
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long *p;
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int retries;
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int pathlen = strlen(path);
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id = rpc_id++;
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buf.u.call.id = htonl(id);
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buf.u.call.type = htonl(MSG_CALL);
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buf.u.call.rpcvers = htonl(2); /* use RPC version 2 */
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buf.u.call.prog = htonl(PROG_NFS);
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buf.u.call.vers = htonl(2); /* nfsd is version 2 */
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buf.u.call.proc = htonl(NFS_LOOKUP);
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p = rpc_add_credentials((long *)buf.u.call.data);
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memcpy(p, fh, NFS_FHSIZE);
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p += (NFS_FHSIZE / 4);
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*p++ = htonl(pathlen);
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if (pathlen & 3) {
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*(p + pathlen / 4) = 0; /* add zero padding */
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}
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memcpy(p, path, pathlen);
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p += (pathlen + 3) / 4;
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for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
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long timeout = rfc2131_sleep_interval(TIMEOUT, retries);
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udp_transmit(server->sin_addr.s_addr, sport, server->sin_port,
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(char *)p - (char *)&buf, &buf);
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if (await_reply(await_rpc, sport, &id, timeout)) {
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rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
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if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
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rpc->u.reply.astatus || rpc->u.reply.data[0]) {
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rpc_printerror(rpc);
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if (rpc->u.reply.rstatus) {
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/* RPC failed, no verifier, data[0] */
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return -9999;
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}
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if (rpc->u.reply.astatus) {
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/* RPC couldn't decode parameters */
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return -9998;
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}
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return -ntohl(rpc->u.reply.data[0]);
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} else {
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memcpy(nfh, rpc->u.reply.data + 1, NFS_FHSIZE);
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return 0;
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}
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}
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}
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return -1;
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}
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/**************************************************************************
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NFS_READ - Read File on NFS Server
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**************************************************************************/
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static int nfs_read(struct sockaddr_in *server, char *fh, int offset, int len,
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int sport)
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{
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struct rpc_t buf, *rpc;
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unsigned long id;
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int retries;
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long *p;
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static int tokens=0;
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/*
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* Try to implement something similar to a window protocol in
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* terms of response to losses. On successful receive, increment
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* the number of tokens by 1 (cap at 256). On failure, halve it.
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* When the number of tokens is >= 2, use a very short timeout.
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*/
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id = rpc_id++;
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buf.u.call.id = htonl(id);
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buf.u.call.type = htonl(MSG_CALL);
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buf.u.call.rpcvers = htonl(2); /* use RPC version 2 */
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buf.u.call.prog = htonl(PROG_NFS);
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buf.u.call.vers = htonl(2); /* nfsd is version 2 */
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buf.u.call.proc = htonl(NFS_READ);
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p = rpc_add_credentials((long *)buf.u.call.data);
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memcpy(p, fh, NFS_FHSIZE);
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p += NFS_FHSIZE / 4;
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*p++ = htonl(offset);
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*p++ = htonl(len);
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*p++ = 0; /* unused parameter */
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for (retries = 0; retries < MAX_RPC_RETRIES; retries++) {
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long timeout = rfc2131_sleep_interval(TIMEOUT, retries);
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if (tokens >= 2)
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timeout = TICKS_PER_SEC/2;
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udp_transmit(server->sin_addr.s_addr, sport, server->sin_port,
|
|
(char *)p - (char *)&buf, &buf);
|
|
if (await_reply(await_rpc, sport, &id, timeout)) {
|
|
if (tokens < 256)
|
|
tokens++;
|
|
rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
|
|
if (rpc->u.reply.rstatus || rpc->u.reply.verifier ||
|
|
rpc->u.reply.astatus || rpc->u.reply.data[0]) {
|
|
rpc_printerror(rpc);
|
|
if (rpc->u.reply.rstatus) {
|
|
/* RPC failed, no verifier, data[0] */
|
|
return -9999;
|
|
}
|
|
if (rpc->u.reply.astatus) {
|
|
/* RPC couldn't decode parameters */
|
|
return -9998;
|
|
}
|
|
return -ntohl(rpc->u.reply.data[0]);
|
|
} else {
|
|
return 0;
|
|
}
|
|
} else
|
|
tokens >>= 1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**************************************************************************
|
|
NFS - Download extended BOOTP data, or kernel image from NFS server
|
|
**************************************************************************/
|
|
static int nfs ( char *url __unused, struct sockaddr_in *server,
|
|
char *name, struct buffer *buffer ) {
|
|
static int recursion = 0;
|
|
int sport;
|
|
int err, namelen = strlen(name);
|
|
char dirname[300], *fname;
|
|
char dirfh[NFS_FHSIZE]; /* file handle of directory */
|
|
char filefh[NFS_FHSIZE]; /* file handle of kernel image */
|
|
int rlen, size, offs, len;
|
|
struct rpc_t *rpc;
|
|
|
|
sport = oport++;
|
|
if (oport > START_OPORT+OPORT_SWEEP) {
|
|
oport = START_OPORT;
|
|
}
|
|
|
|
mount_server.sin_addr = nfs_server.sin_addr = server->sin_addr;
|
|
mount_server.sin_port = rpc_lookup(server, PROG_MOUNT, 1, sport);
|
|
if ( ! mount_server.sin_port ) {
|
|
DBG ( "Cannot get mount port from %s:%d\n",
|
|
inet_ntoa ( server->sin_addr ), server->sin_port );
|
|
return 0;
|
|
}
|
|
nfs_server.sin_port = rpc_lookup(server, PROG_NFS, 2, sport);
|
|
if ( ! mount_server.sin_port ) {
|
|
DBG ( "Cannot get nfs port from %s:%d\n",
|
|
inet_ntoa ( server->sin_addr ), server->sin_port );
|
|
return 0;
|
|
}
|
|
|
|
if ( name != dirname ) {
|
|
memcpy(dirname, name, namelen + 1);
|
|
}
|
|
recursion = 0;
|
|
nfssymlink:
|
|
if ( recursion > NFS_MAXLINKDEPTH ) {
|
|
DBG ( "\nRecursion: More than %d symlinks followed. Abort.\n",
|
|
NFS_MAXLINKDEPTH );
|
|
return 0;
|
|
}
|
|
recursion++;
|
|
fname = dirname + (namelen - 1);
|
|
while (fname >= dirname) {
|
|
if (*fname == '/') {
|
|
*fname = '\0';
|
|
fname++;
|
|
break;
|
|
}
|
|
fname--;
|
|
}
|
|
if (fname < dirname) {
|
|
DBG("can't parse file name %s\n", name);
|
|
return 0;
|
|
}
|
|
|
|
err = nfs_mount(&mount_server, dirname, dirfh, sport);
|
|
if (err) {
|
|
DBG("mounting %s: ", dirname);
|
|
nfs_printerror(err);
|
|
/* just to be sure... */
|
|
nfs_reset();
|
|
return 0;
|
|
}
|
|
|
|
err = nfs_lookup(&nfs_server, dirfh, fname, filefh, sport);
|
|
if (err) {
|
|
DBG("looking up %s: ", fname);
|
|
nfs_printerror(err);
|
|
nfs_reset();
|
|
return 0;
|
|
}
|
|
|
|
offs = 0;
|
|
size = -1; /* will be set properly with the first reply */
|
|
len = NFS_READ_SIZE; /* first request is always full size */
|
|
do {
|
|
err = nfs_read(&nfs_server, filefh, offs, len, sport);
|
|
if ((err <= -NFSERR_ISDIR)&&(err >= -NFSERR_INVAL) && (offs == 0)) {
|
|
// An error occured. NFS servers tend to sending
|
|
// errors 21 / 22 when symlink instead of real file
|
|
// is requested. So check if it's a symlink!
|
|
if ( nfs_readlink(&nfs_server, dirfh, dirname,
|
|
filefh, sport) == 0 ) {
|
|
printf("\nLoading symlink:%s ..",dirname);
|
|
goto nfssymlink;
|
|
}
|
|
nfs_printerror(err);
|
|
nfs_reset();
|
|
return 0;
|
|
}
|
|
if (err) {
|
|
printf("\nError reading at offset %d: ", offs);
|
|
nfs_printerror(err);
|
|
nfs_reset();
|
|
return 0;
|
|
}
|
|
|
|
rpc = (struct rpc_t *)&nic.packet[ETH_HLEN];
|
|
|
|
/* size must be found out early to allow EOF detection */
|
|
if (size == -1) {
|
|
size = ntohl(rpc->u.reply.data[6]);
|
|
}
|
|
rlen = ntohl(rpc->u.reply.data[18]);
|
|
if (rlen > len) {
|
|
rlen = len; /* shouldn't happen... */
|
|
}
|
|
|
|
if ( ! fill_buffer ( buffer, &rpc->u.reply.data[19],
|
|
offs, rlen ) ) {
|
|
nfs_reset();
|
|
return 0;
|
|
}
|
|
|
|
offs += rlen;
|
|
/* last request is done with matching requested read size */
|
|
if (size-offs < NFS_READ_SIZE) {
|
|
len = size-offs;
|
|
}
|
|
} while (len != 0);
|
|
/* len == 0 means that all the file has been read */
|
|
return 1;
|
|
}
|
|
|
|
struct protocol nfs_protocol __protocol = {
|
|
.name = "nfs",
|
|
.default_port = SUNRPC_PORT,
|
|
.load = nfs,
|
|
};
|
|
|
|
#endif
|