Author: tsoome
Date: Wed Aug 31 09:23:09 2016
New Revision: 305116
URL: https://svnweb.freebsd.org/changeset/base/305116

Log:
  recvtftp() is broken for large files, report file size
  
  The tftp download for large files will cause internal block id
  to wrap to 0 as the data type is unsigned short.
  
  Also provide file size information for stat.
  
  PR:           200500
  Reported by:  tsoome
  Reviewed by:  allanjude
  Approved by:  allanjude (mentor)
  Differential Revision:        https://reviews.freebsd.org/D7660

Modified:
  head/lib/libstand/tftp.c

Modified: head/lib/libstand/tftp.c
==============================================================================
--- head/lib/libstand/tftp.c    Wed Aug 31 07:42:46 2016        (r305115)
+++ head/lib/libstand/tftp.c    Wed Aug 31 09:23:09 2016        (r305116)
@@ -200,7 +200,7 @@ recvtftp(struct tftp_handle *h, void *pk
        case DATA: {
                int got;
 
-               if (htons(t->th_block) != d->xid) {
+               if (htons(t->th_block) != (u_short) d->xid) {
                        /*
                         * Expected block?
                         */
@@ -560,7 +560,7 @@ tftp_stat(struct open_file *f, struct st
        sb->st_nlink = 1;
        sb->st_uid = 0;
        sb->st_gid = 0;
-       sb->st_size = -1;
+       sb->st_size = (off_t) tftpfile->tftp_tsize;
        return (0);
 }
 
@@ -731,6 +731,8 @@ tftp_parse_oack(struct tftp_handle *h, c
            } else if (strcasecmp(tftp_options[i], "tsize") == 0) {
                if (i + 1 < option_idx)
                        tsize = strtol(tftp_options[i + 1], (char **)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]);
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