#include <sys/socket.h> if it exists;

Add option to control the max blksize negotiated.

CHANGES

@@ -1,5 +1,10 @@
 $Id$
 
+Changes in 0.35:
+	Add an option to control the maximum value of blksize
+	negotiated.
+
+
 Changes in 0.34:
 	Additional Solaris gcc compiler bug workarounds; these
 	actually make the code somewhat cleaner.

config.h

@@ -96,7 +96,17 @@
 #include <errno.h>
 #include <signal.h>
 
+#ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>
+#else
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>
+#else
+#ifdef HAVE_WINSOCK_H
+#include <winsock.h>
+#endif
+#endif
+#endif
 
 /* Test for EAGAIN/EWOULDBLOCK */
 #ifdef EAGAIN

configure.in

@@ -77,6 +77,9 @@ AC_CHECK_HEADERS(arpa/inet.h)
 AC_HEADER_TIME
 dnl This is needed on some versions of FreeBSD...
 AC_CHECK_HEADERS(machine/param.h)
+AC_CHECK_HEADERS(sys/socket.h)
+AC_CHECK_HEADERS(winsock2.h)
+AC_CHECK_HEADERS(winsock.h)
 
 AC_CHECK_TYPES(intmax_t)
 AC_CHECK_TYPES(long long)
@@ -89,7 +92,7 @@ AC_TYPE_PID_T
 AC_TYPE_MODE_T
 AC_TYPE_SIZE_T
 
-AC_SEARCH_LIBS(socket, socket, , [AC_MSG_ERROR(socket library not found)])
+AC_SEARCH_LIBS(socket, [socket ws2_32 wsock32], , [AC_MSG_ERROR(socket library not found)])
 AC_SEARCH_LIBS(gethostbyname, [nsl resolv], , [AC_MSG_ERROR(gethostbyname not found)])
 AC_SEARCH_LIBS(inet_aton, [nsl resolv], , [AC_MSG_ERROR(inet_aton not found)])
 AC_SEARCH_LIBS(herror, [nsl resolv], , [AC_MSG_ERROR(herror not found)])

tftpd/tftpd.8.in

@@ -150,6 +150,15 @@ This flag can be specified multiple times for even higher verbosity.
 Indicate that a specific RFC 2347 TFTP option should never be
 accepted.
 .TP
+\fB\-B\fP \fImax-block-size\fP
+Specifies the maximum permitted block size.  The permitted range for
+this parameter is from 512 to 65464.  Some embedded clients request
+large block sizes and yet do not handle fragmented packets correctly;
+for these clients, it is recommended to set this value to the smallest
+MTU on your network minus 32 bytes (20 bytes for IP, 8 for UDP, and 4
+for TFTP; less if you use IP options on your network.)  For example,
+on a standard Ethernet (MTU 1500) a value of 1468 is reasonable.
+.TP
 .B \-V
 Print the version number and configuration to standard output, then
 exit gracefully.

tftpd/tftpd.c

@@ -94,6 +94,8 @@ sigjmp_buf    timeoutbuf;
 #define	PKTSIZE	MAX_SEGSIZE+4
 char		buf[PKTSIZE];
 char		ackbuf[PKTSIZE];
+unsigned int	max_blksize = MAX_SEGSIZE;
+
 struct	sockaddr_in from;
 int	fromlen;
 off_t	tsize;
@@ -279,7 +281,7 @@ main(int argc, char **argv)
   
   openlog(__progname, LOG_PID|LOG_NDELAY, LOG_DAEMON);
   
-  while ((c = getopt(argc, argv, "cspvVla:u:U:r:t:T:m:")) != -1)
+  while ((c = getopt(argc, argv, "cspvVla:B:u:U:r:t:T:m:")) != -1)
     switch (c) {
     case 'c':
       cancreate = 1;
@@ -299,6 +301,17 @@ main(int argc, char **argv)
     case 't':
       waittime = atoi(optarg);
       break;
+    case 'B':
+      {
+	char *vp;
+	max_blksize = (unsigned int)strtoul(optarg, &vp, 10);
+	if ( max_blksize < 512 || max_blksize > MAX_SEGSIZE || *vp ) {
+	  syslog(LOG_ERR, "Bad maximum blocksize value (range 512-%d): %s",
+		 MAX_SEGSIZE, optarg);
+	  exit(EX_USAGE);
+	}
+      }
+      break;
     case 'T':
       {
 	char *vp;
@@ -817,8 +830,8 @@ set_blksize(char *val, char **ret)
   
   if (sz < 8)
     return(0);
-  else if (sz > MAX_SEGSIZE)
+  else if (sz > max_blksize)
-    sz = MAX_SEGSIZE;
+    sz = max_blksize;
   
   segsize = sz;
   sprintf(*ret = b_ret, "%u", sz);
@@ -845,8 +858,8 @@ set_blksize2(char *val, char **ret)
   
   if (sz < 8)
     return(0);
-  else if (sz > MAX_SEGSIZE)
+  else if (sz > max_blksize)
-    sz = MAX_SEGSIZE;
+    sz = max_blksize;
   
   /* Convert to a power of two */
   if ( sz & (sz-1) ) {

version

@@ -1 +1 @@
-0.34
+0.35