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-rw-r--r--usr/src/boot/libsa/tftp.c754
1 files changed, 754 insertions, 0 deletions
diff --git a/usr/src/boot/libsa/tftp.c b/usr/src/boot/libsa/tftp.c
new file mode 100644
index 0000000000..f324bf20e7
--- /dev/null
+++ b/usr/src/boot/libsa/tftp.c
@@ -0,0 +1,754 @@
+/* $NetBSD: tftp.c,v 1.4 1997/09/17 16:57:07 drochner Exp $ */
+
+/*
+ * Copyright (c) 1996
+ * Matthias Drochner. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed for the NetBSD Project
+ * by Matthias Drochner.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+
+/*
+ * Simple TFTP implementation for libsa.
+ * Assumes:
+ * - socket descriptor (int) at dev->d_opendata, dev stored at
+ * open_file->f_devdata
+ * - server host IP in global rootip
+ * Restrictions:
+ * - read only
+ * - lseek only with SEEK_SET or SEEK_CUR
+ * - no big time differences between transfers (<tftp timeout)
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <netinet/udp.h>
+#include <netinet/in_systm.h>
+#include <arpa/tftp.h>
+
+#include <string.h>
+
+#include "stand.h"
+#include "net.h"
+#include "netif.h"
+
+#include "tftp.h"
+
+struct tftp_handle;
+struct tftprecv_extra;
+
+static ssize_t recvtftp(struct iodesc *, void **, void **, time_t, void *);
+static int tftp_open(const char *, struct open_file *);
+static int tftp_close(struct open_file *);
+static int tftp_parse_oack(struct tftp_handle *, char *, size_t);
+static int tftp_read(struct open_file *, void *, size_t, size_t *);
+static off_t tftp_seek(struct open_file *, off_t, int);
+static int tftp_set_blksize(struct tftp_handle *, const char *);
+static int tftp_stat(struct open_file *, struct stat *);
+
+struct fs_ops tftp_fsops = {
+ .fs_name = "tftp",
+ .fo_open = tftp_open,
+ .fo_close = tftp_close,
+ .fo_read = tftp_read,
+ .fo_write = null_write,
+ .fo_seek = tftp_seek,
+ .fo_stat = tftp_stat,
+ .fo_readdir = null_readdir
+};
+
+static int tftpport = 2000;
+static int is_open = 0;
+
+/*
+ * The legacy TFTP_BLKSIZE value was SEGSIZE(512).
+ * TFTP_REQUESTED_BLKSIZE of 1428 is (Ethernet MTU, less the TFTP, UDP and
+ * IP header lengths).
+ */
+#define TFTP_REQUESTED_BLKSIZE 1428
+
+/*
+ * Choose a blksize big enough so we can test with Ethernet
+ * Jumbo frames in the future.
+ */
+#define TFTP_MAX_BLKSIZE 9008
+
+struct tftp_handle {
+ struct iodesc *iodesc;
+ int currblock; /* contents of lastdata */
+ int islastblock; /* flag */
+ int validsize;
+ int off;
+ char *path; /* saved for re-requests */
+ unsigned int tftp_blksize;
+ unsigned long tftp_tsize;
+ void *pkt;
+ struct tftphdr *tftp_hdr;
+};
+
+struct tftprecv_extra {
+ struct tftp_handle *tftp_handle;
+ unsigned short rtype; /* Received type */
+};
+
+#define TFTP_MAX_ERRCODE EOPTNEG
+static const int tftperrors[TFTP_MAX_ERRCODE + 1] = {
+ 0, /* ??? */
+ ENOENT,
+ EPERM,
+ ENOSPC,
+ EINVAL, /* ??? */
+ EINVAL, /* ??? */
+ EEXIST,
+ EINVAL, /* ??? */
+ EINVAL, /* Option negotiation failed. */
+};
+
+static int tftp_getnextblock(struct tftp_handle *h);
+
+/* send error message back. */
+static void
+tftp_senderr(struct tftp_handle *h, ushort_t errcode, const char *msg)
+{
+ struct {
+ uchar_t header[HEADER_SIZE];
+ struct tftphdr t;
+ uchar_t space[63]; /* +1 from t */
+ } __packed __aligned(4) wbuf;
+ char *wtail;
+ int len;
+
+ len = strlen(msg);
+ if (len > sizeof (wbuf.space))
+ len = sizeof (wbuf.space);
+
+ wbuf.t.th_opcode = htons((ushort_t)ERROR);
+ wbuf.t.th_code = htons(errcode);
+
+ wtail = wbuf.t.th_msg;
+ bcopy(msg, wtail, len);
+ wtail[len] = '\0';
+ wtail += len + 1;
+
+ sendudp(h->iodesc, &wbuf.t, wtail - (char *)&wbuf.t);
+}
+
+static void
+tftp_sendack(struct tftp_handle *h, ushort_t block)
+{
+ struct {
+ uchar_t header[HEADER_SIZE];
+ struct tftphdr t;
+ } __packed __aligned(4) wbuf;
+ char *wtail;
+
+ wbuf.t.th_opcode = htons((ushort_t)ACK);
+ wtail = (char *)&wbuf.t.th_block;
+ wbuf.t.th_block = htons(block);
+ wtail += 2;
+
+ sendudp(h->iodesc, &wbuf.t, wtail - (char *)&wbuf.t);
+}
+
+static ssize_t
+recvtftp(struct iodesc *d, void **pkt, void **payload, time_t tleft,
+ void *recv_extra)
+{
+ struct tftprecv_extra *extra;
+ struct tftp_handle *h;
+ struct tftphdr *t;
+ void *ptr = NULL;
+ ssize_t len;
+
+ errno = 0;
+ extra = recv_extra;
+ h = extra->tftp_handle;
+
+ len = readudp(d, &ptr, (void **)&t, tleft);
+
+ if (len < 4) {
+ free(ptr);
+ return (-1);
+ }
+
+ extra->rtype = ntohs(t->th_opcode);
+ switch (ntohs(t->th_opcode)) {
+ case DATA: {
+ int got;
+
+ if (htons(t->th_block) < (ushort_t)d->xid) {
+ /*
+ * Apparently our ACK was missed, re-send.
+ */
+ tftp_sendack(h, htons(t->th_block));
+ free(ptr);
+ return (-1);
+ }
+ if (htons(t->th_block) != (ushort_t)d->xid) {
+ /*
+ * Packet from the future, drop this.
+ */
+ free(ptr);
+ return (-1);
+ }
+ if (d->xid == 1) {
+ /*
+ * First data packet from new port.
+ */
+ struct udphdr *uh;
+ uh = (struct udphdr *)t - 1;
+ d->destport = uh->uh_sport;
+ }
+ got = len - (t->th_data - (char *)t);
+ *pkt = ptr;
+ *payload = t;
+ return (got);
+ }
+ case ERROR:
+ if ((unsigned)ntohs(t->th_code) > TFTP_MAX_ERRCODE) {
+ printf("illegal tftp error %d\n", ntohs(t->th_code));
+ errno = EIO;
+ } else {
+#ifdef TFTP_DEBUG
+ printf("tftp-error %d\n", ntohs(t->th_code));
+#endif
+ errno = tftperrors[ntohs(t->th_code)];
+ }
+ free(ptr);
+ return (-1);
+ case OACK: {
+ struct udphdr *uh;
+ int tftp_oack_len;
+
+ /*
+ * Unexpected OACK. TFTP transfer already in progress.
+ * Drop the pkt.
+ */
+ if (d->xid != 1) {
+ free(ptr);
+ return (-1);
+ }
+
+ /*
+ * Remember which port this OACK came from, because we need
+ * to send the ACK or errors back to it.
+ */
+ uh = (struct udphdr *)t - 1;
+ d->destport = uh->uh_sport;
+
+ /* Parse options ACK-ed by the server. */
+ tftp_oack_len = len - sizeof (t->th_opcode);
+ if (tftp_parse_oack(h, t->th_u.tu_stuff, tftp_oack_len) != 0) {
+ tftp_senderr(h, EOPTNEG, "Malformed OACK");
+ errno = EIO;
+ free(ptr);
+ return (-1);
+ }
+ *pkt = ptr;
+ *payload = t;
+ return (0);
+ }
+ default:
+#ifdef TFTP_DEBUG
+ printf("tftp type %d not handled\n", ntohs(t->th_opcode));
+#endif
+ free(ptr);
+ return (-1);
+ }
+}
+
+/* send request, expect first block (or error) */
+static int
+tftp_makereq(struct tftp_handle *h)
+{
+ struct {
+ uchar_t header[HEADER_SIZE];
+ struct tftphdr t;
+ uchar_t space[FNAME_SIZE + 6];
+ } __packed __aligned(4) wbuf;
+ struct tftprecv_extra recv_extra;
+ char *wtail;
+ int l;
+ ssize_t res;
+ void *pkt;
+ struct tftphdr *t;
+ char *tftp_blksize = NULL;
+ int blksize_l;
+
+ /*
+ * Allow overriding default TFTP block size by setting
+ * a tftp.blksize environment variable.
+ */
+ if ((tftp_blksize = getenv("tftp.blksize")) != NULL) {
+ tftp_set_blksize(h, tftp_blksize);
+ }
+
+ wbuf.t.th_opcode = htons((ushort_t)RRQ);
+ wtail = wbuf.t.th_stuff;
+ l = strlen(h->path);
+#ifdef TFTP_PREPEND_PATH
+ if (l > FNAME_SIZE - (sizeof (TFTP_PREPEND_PATH) - 1))
+ return (ENAMETOOLONG);
+ bcopy(TFTP_PREPEND_PATH, wtail, sizeof (TFTP_PREPEND_PATH) - 1);
+ wtail += sizeof (TFTP_PREPEND_PATH) - 1;
+#else
+ if (l > FNAME_SIZE)
+ return (ENAMETOOLONG);
+#endif
+ bcopy(h->path, wtail, l + 1);
+ wtail += l + 1;
+ bcopy("octet", wtail, 6);
+ wtail += 6;
+ bcopy("blksize", wtail, 8);
+ wtail += 8;
+ blksize_l = sprintf(wtail, "%d", h->tftp_blksize);
+ wtail += blksize_l + 1;
+ bcopy("tsize", wtail, 6);
+ wtail += 6;
+ bcopy("0", wtail, 2);
+ wtail += 2;
+
+ h->iodesc->myport = htons(tftpport + (getsecs() & 0x3ff));
+ h->iodesc->destport = htons(IPPORT_TFTP);
+ h->iodesc->xid = 1; /* expected block */
+
+ h->currblock = 0;
+ h->islastblock = 0;
+ h->validsize = 0;
+
+ pkt = NULL;
+ recv_extra.tftp_handle = h;
+ res = sendrecv(h->iodesc, &sendudp, &wbuf.t, wtail - (char *)&wbuf.t,
+ &recvtftp, &pkt, (void **)&t, &recv_extra);
+ if (res == -1) {
+ free(pkt);
+ return (errno);
+ }
+
+ free(h->pkt);
+ h->pkt = pkt;
+ h->tftp_hdr = t;
+
+ if (recv_extra.rtype == OACK)
+ return (tftp_getnextblock(h));
+
+ /* Server ignored our blksize request, revert to TFTP default. */
+ h->tftp_blksize = SEGSIZE;
+
+ switch (recv_extra.rtype) {
+ case DATA: {
+ h->currblock = 1;
+ h->validsize = res;
+ h->islastblock = 0;
+ if (res < h->tftp_blksize) {
+ h->islastblock = 1; /* very short file */
+ tftp_sendack(h, h->currblock);
+ }
+ return (0);
+ }
+ case ERROR:
+ default:
+ return (errno);
+ }
+
+}
+
+/* ack block, expect next */
+static int
+tftp_getnextblock(struct tftp_handle *h)
+{
+ struct {
+ uchar_t header[HEADER_SIZE];
+ struct tftphdr t;
+ } __packed __aligned(4) wbuf;
+ struct tftprecv_extra recv_extra;
+ char *wtail;
+ int res;
+ void *pkt;
+ struct tftphdr *t;
+
+ wbuf.t.th_opcode = htons((ushort_t)ACK);
+ wtail = (char *)&wbuf.t.th_block;
+ wbuf.t.th_block = htons((ushort_t)h->currblock);
+ wtail += 2;
+
+ h->iodesc->xid = h->currblock + 1; /* expected block */
+
+ pkt = NULL;
+ recv_extra.tftp_handle = h;
+ res = sendrecv(h->iodesc, &sendudp, &wbuf.t, wtail - (char *)&wbuf.t,
+ &recvtftp, &pkt, (void **)&t, &recv_extra);
+
+ if (res == -1) { /* 0 is OK! */
+ free(pkt);
+ return (errno);
+ }
+
+ free(h->pkt);
+ h->pkt = pkt;
+ h->tftp_hdr = t;
+ h->currblock++;
+ h->validsize = res;
+ if (res < h->tftp_blksize)
+ h->islastblock = 1; /* EOF */
+
+ if (h->islastblock == 1) {
+ /* Send an ACK for the last block */
+ wbuf.t.th_block = htons((ushort_t)h->currblock);
+ sendudp(h->iodesc, &wbuf.t, wtail - (char *)&wbuf.t);
+ }
+
+ return (0);
+}
+
+static int
+tftp_open(const char *path, struct open_file *f)
+{
+ struct devdesc *dev;
+ struct tftp_handle *tftpfile;
+ struct iodesc *io;
+ int res;
+ size_t pathsize;
+ const char *extraslash;
+
+ if (netproto != NET_TFTP)
+ return (EINVAL);
+
+ if (f->f_dev->dv_type != DEVT_NET)
+ return (EINVAL);
+
+ if (is_open)
+ return (EBUSY);
+
+ tftpfile = calloc(1, sizeof (*tftpfile));
+ if (!tftpfile)
+ return (ENOMEM);
+
+ tftpfile->tftp_blksize = TFTP_REQUESTED_BLKSIZE;
+ dev = f->f_devdata;
+ tftpfile->iodesc = io = socktodesc(*(int *)(dev->d_opendata));
+ if (io == NULL) {
+ free(tftpfile);
+ return (EINVAL);
+ }
+
+ io->destip = rootip;
+ tftpfile->off = 0;
+ pathsize = (strlen(rootpath) + 1 + strlen(path) + 1) * sizeof (char);
+ tftpfile->path = malloc(pathsize);
+ if (tftpfile->path == NULL) {
+ free(tftpfile);
+ return (ENOMEM);
+ }
+ if (rootpath[strlen(rootpath) - 1] == '/' || path[0] == '/')
+ extraslash = "";
+ else
+ extraslash = "/";
+ res = snprintf(tftpfile->path, pathsize, "%s%s%s",
+ rootpath, extraslash, path);
+ if (res < 0 || res > pathsize) {
+ free(tftpfile->path);
+ free(tftpfile);
+ return (ENOMEM);
+ }
+
+ res = tftp_makereq(tftpfile);
+
+ if (res) {
+ free(tftpfile->path);
+ free(tftpfile->pkt);
+ free(tftpfile);
+ return (res);
+ }
+ f->f_fsdata = tftpfile;
+ is_open = 1;
+ return (0);
+}
+
+static int
+tftp_read(struct open_file *f, void *addr, size_t size,
+ size_t *resid /* out */)
+{
+ struct tftp_handle *tftpfile;
+ size_t res;
+ int rc;
+
+ rc = 0;
+ res = size;
+ tftpfile = f->f_fsdata;
+
+ /* Make sure we will not read past file end */
+ if (tftpfile->tftp_tsize > 0 &&
+ tftpfile->off + size > tftpfile->tftp_tsize) {
+ size = tftpfile->tftp_tsize - tftpfile->off;
+ }
+
+ while (size > 0) {
+ int needblock, count;
+
+ twiddle(32);
+
+ needblock = tftpfile->off / tftpfile->tftp_blksize + 1;
+
+ if (tftpfile->currblock > needblock) { /* seek backwards */
+ tftp_senderr(tftpfile, 0, "No error: read aborted");
+ rc = tftp_makereq(tftpfile);
+ if (rc != 0)
+ break;
+ }
+
+ while (tftpfile->currblock < needblock) {
+
+ rc = tftp_getnextblock(tftpfile);
+ if (rc) { /* no answer */
+#ifdef TFTP_DEBUG
+ printf("tftp: read error\n");
+#endif
+ return (rc);
+ }
+ if (tftpfile->islastblock)
+ break;
+ }
+
+ if (tftpfile->currblock == needblock) {
+ int offinblock, inbuffer;
+
+ offinblock = tftpfile->off % tftpfile->tftp_blksize;
+
+ inbuffer = tftpfile->validsize - offinblock;
+ if (inbuffer < 0) {
+#ifdef TFTP_DEBUG
+ printf("tftp: invalid offset %d\n",
+ tftpfile->off);
+#endif
+ return (EINVAL);
+ }
+ count = (size < inbuffer ? size : inbuffer);
+ bcopy(tftpfile->tftp_hdr->th_data + offinblock,
+ addr, count);
+
+ addr = (char *)addr + count;
+ tftpfile->off += count;
+ size -= count;
+ res -= count;
+
+ if ((tftpfile->islastblock) && (count == inbuffer))
+ break; /* EOF */
+ } else {
+#ifdef TFTP_DEBUG
+ printf("tftp: block %d not found\n", needblock);
+#endif
+ return (EINVAL);
+ }
+
+ }
+
+ if (resid != NULL)
+ *resid = res;
+ return (rc);
+}
+
+static int
+tftp_close(struct open_file *f)
+{
+ struct tftp_handle *tftpfile;
+ tftpfile = f->f_fsdata;
+
+ /* let it time out ... */
+
+ if (tftpfile) {
+ free(tftpfile->path);
+ free(tftpfile->pkt);
+ free(tftpfile);
+ }
+ is_open = 0;
+ return (0);
+}
+
+static int
+tftp_stat(struct open_file *f, struct stat *sb)
+{
+ struct tftp_handle *tftpfile;
+ tftpfile = f->f_fsdata;
+
+ sb->st_mode = 0444 | S_IFREG;
+ sb->st_nlink = 1;
+ sb->st_uid = 0;
+ sb->st_gid = 0;
+ sb->st_size = tftpfile->tftp_tsize;
+ return (0);
+}
+
+static off_t
+tftp_seek(struct open_file *f, off_t offset, int where)
+{
+ struct tftp_handle *tftpfile;
+ tftpfile = f->f_fsdata;
+
+ switch (where) {
+ case SEEK_SET:
+ tftpfile->off = offset;
+ break;
+ case SEEK_CUR:
+ tftpfile->off += offset;
+ break;
+ default:
+ errno = EOFFSET;
+ return (-1);
+ }
+ return (tftpfile->off);
+}
+
+static int
+tftp_set_blksize(struct tftp_handle *h, const char *str)
+{
+ char *endptr;
+ int new_blksize;
+ int ret = 0;
+
+ if (h == NULL || str == NULL)
+ return (ret);
+
+ new_blksize =
+ (unsigned int)strtol(str, &endptr, 0);
+
+ /*
+ * Only accept blksize value if it is numeric.
+ * RFC2348 specifies that acceptable values are 8-65464.
+ * Let's choose a limit less than MAXRSPACE.
+ */
+ if (*endptr == '\0' && new_blksize >= 8 &&
+ new_blksize <= TFTP_MAX_BLKSIZE) {
+ h->tftp_blksize = new_blksize;
+ ret = 1;
+ }
+
+ return (ret);
+}
+
+/*
+ * In RFC2347, the TFTP Option Acknowledgement package (OACK)
+ * is used to acknowledge a client's option negotiation request.
+ * The format of an OACK packet is:
+ * +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+
+ * | opc | opt1 | 0 | value1 | 0 | optN | 0 | valueN | 0 |
+ * +-------+---~~---+---+---~~---+---+---~~---+---+---~~---+---+
+ *
+ * opc
+ * The opcode field contains a 6, for Option Acknowledgment.
+ *
+ * opt1
+ * The first option acknowledgment, copied from the original
+ * request.
+ *
+ * value1
+ * The acknowledged value associated with the first option. If
+ * and how this value may differ from the original request is
+ * detailed in the specification for the option.
+ *
+ * optN, valueN
+ * The final option/value acknowledgment pair.
+ */
+static int
+tftp_parse_oack(struct tftp_handle *h, char *buf, size_t len)
+{
+ /*
+ * We parse the OACK strings into an array
+ * of name-value pairs.
+ */
+ char *tftp_options[128] = { 0 };
+ char *val = buf;
+ int i = 0;
+ int option_idx = 0;
+ int blksize_is_set = 0;
+ int tsize = 0;
+
+ unsigned int orig_blksize;
+
+ while (option_idx < 128 && i < len) {
+ if (buf[i] == '\0') {
+ if (&buf[i] > val) {
+ tftp_options[option_idx] = val;
+ val = &buf[i] + 1;
+ ++option_idx;
+ }
+ }
+ ++i;
+ }
+
+ /* Save the block size we requested for sanity check later. */
+ orig_blksize = h->tftp_blksize;
+
+ /*
+ * Parse individual TFTP options.
+ * * "blksize" is specified in RFC2348.
+ * * "tsize" is specified in RFC2349.
+ */
+ for (i = 0; i < option_idx; i += 2) {
+ if (strcasecmp(tftp_options[i], "blksize") == 0) {
+ if (i + 1 < option_idx)
+ blksize_is_set =
+ tftp_set_blksize(h, tftp_options[i + 1]);
+ } else if (strcasecmp(tftp_options[i], "tsize") == 0) {
+ if (i + 1 < option_idx)
+ tsize = strtol(tftp_options[i + 1], NULL, 10);
+ if (tsize != 0)
+ h->tftp_tsize = tsize;
+ } else {
+ /*
+ * Do not allow any options we did not expect to be
+ * ACKed.
+ */
+ printf("unexpected tftp option '%s'\n",
+ tftp_options[i]);
+ return (-1);
+ }
+ }
+
+ if (!blksize_is_set) {
+ /*
+ * If TFTP blksize was not set, try defaulting
+ * to the legacy TFTP blksize of SEGSIZE(512)
+ */
+ h->tftp_blksize = SEGSIZE;
+ } else if (h->tftp_blksize > orig_blksize) {
+ /*
+ * Server should not be proposing block sizes that
+ * exceed what we said we can handle.
+ */
+ printf("unexpected blksize %u\n", h->tftp_blksize);
+ return (-1);
+ }
+
+#ifdef TFTP_DEBUG
+ printf("tftp_blksize: %u\n", h->tftp_blksize);
+ printf("tftp_tsize: %lu\n", h->tftp_tsize);
+#endif
+ return (0);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 13:37:17 +0000