Fix some timeout-related bugs; allow the user to set the default timeout.

CHANGES

@@ -1,5 +1,14 @@
 $Id$
 
+Changes in 0.31:
+	Put in a check to make sure xinetd (in particular) doesn't
+	pass us an IPv6 socket.
+
+	Fix some problems related to timeout negotiation.
+
+	Allow the user to set the default timeout speed.
+
+
 Changes in 0.30:
 	(Hopefully) better timeout algorithm.
 

tftpd/tftpd.8.in

@@ -31,7 +31,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"----------------------------------------------------------------------- */
-.TH TFTPD 8 "16 November 2001" "tftp-hpa @@VERSION@@" "UNIX System Manager's Manual"
+.TH TFTPD 8 "23 October 2002" "tftp-hpa @@VERSION@@" "System Manager's Manual"
 .SH NAME
 .B tftpd
 \- IPv4 Trivial File Transfer Protocol server
@@ -125,6 +125,14 @@ before terminating the server.
 will then respawn the server when another request comes in.  The
 default is 900 (15 minutes.)
 .TP
+\fB\-T\fP \fItimeout\fP
+Determine the default timeout, in microseconds, before the first
+packet is retransmitted.  This can be modified by the client if the
+.B timeout
+or
+.B utimeout
+option is negotiated.  The default is 1000000 (1 second.)
+.TP
 \fB\-m\fP \fIremap-file\fP
 Specify the use of filename remapping.  The
 .I remap-file
@@ -149,25 +157,44 @@ exit gracefully.
 This version of
 .B tftpd
 supports RFC 2347 option negotation.  Currently implemented options
-are
+are:
-.B blksize
+.TP
-(RFC 2348),
+\fBblksize\fP (RFC 2348)
-.B blksize2
+Set the transfer block size to anything less than or equal to the
-(nonstandard),
+specified option.  This version of
+.B tftpd
+can support any block size up to the theoretical maximum of 65464
+bytes.
+.TP
+\fBblksize2\fP (nonstandard)
+Set the transfer block size to anything less than or equal to the
+specified option, but restrict the possible responses to powers of 2.
+The maximum is 32768 bytes (the largest power of 2 less than or equal
+to 65464.)
+.TP
+\fBtsize\fP (RFC 2349)
+Report the size of the file that is about to be transferred.  This
+version of
+.B tftpd
+only supports the
 .B tsize
-(RFC 2349), and
+option for binary (octet) mode transfers.
-.B timeout
+.TP
-(RFC 2349).  The nonstandard
+\fBtimeout\fP (RFC 2349)
-.B blksize2
+Set the time before the server retransmits a packet, in seconds.
-TFTP option is functionally identical to the
+.TP
-.B blksize
+\fButimeout\fP (nonstandard)
-option, with the additional constraint that the
+Set the time before the server retransmits a packet, in microseconds.
-blocksize is constrained to be a power of 2.
+and
 .PP
 The
 .B \-r
 option can be used to disable specific options; this may be necessary
-to work around bugs in specific TFTP client implementations.
+to work around bugs in specific TFTP client implementations.  For
+example, some TFTP clients have been found to request the
+.B blksize
+option, but crash with an error if they actually get the option
+accepted by the server.
 .SH "FILENAME REMAPPING"
 The
 .B \-m

tftpd/tftpd.c

@@ -79,17 +79,17 @@ int allow_severity	= -1;	/* Don't log at all */
 struct request_info wrap_request;
 #endif
 
-#define	TIMEOUT 1000		/* Default timeout (ms) */
+#define	TIMEOUT 1000000		/* Default timeout (us) */
 #define TRIES   6		/* Number of attempts to send each packet */
 #define TIMEOUT_LIMIT ((1 << TRIES)-1)
 
-char   *__progname;
+const char    *__progname;
-int	peer;
+int	      peer;
-int	timeout    = TIMEOUT;	/* Current timeout value */
+unsigned long timeout    = TIMEOUT;	/* Current timeout value */
-int     timeout_quit = 0;
+unsigned long rexmtval   = TIMEOUT;	/* Basic timeout value */
-int	rexmtval   = TIMEOUT;	/* Basic timeout value */
+unsigned long maxtimeout = TIMEOUT_LIMIT*TIMEOUT;
-int	maxtimeout = TIMEOUT_LIMIT*TIMEOUT;
+int           timeout_quit = 0;
-sigjmp_buf	timeoutbuf;
+sigjmp_buf    timeoutbuf;
 
 #define	PKTSIZE	MAX_SEGSIZE+4
 char	buf[PKTSIZE];
@@ -160,7 +160,7 @@ timer(int sig)
 static void
 usage(void)
 {
-  syslog(LOG_ERR, "Usage: %s [-vcl][-a address][-m mappings][-u user][-t timeout][-r option...] [-s] [directory ...]",
+  syslog(LOG_ERR, "Usage: %s [-vcl][-a address][-m mappings][-u user][-t inetd_timeout][-T pkt_timeout][-r option...] [-s] [directory ...]",
 	 __progname);
   exit(EX_USAGE);
 }
@@ -208,7 +208,7 @@ set_socket_nonblock(int fd, int flag)
  * Receive packet with synchronous timeout
  */
 static int recv_time(int s, void *rbuf, int len, unsigned int flags,
-		     unsigned long timeout_ms)
+		     unsigned long timeout_us)
 {
   fd_set fdset;
   struct timeval tmv;
@@ -218,8 +218,8 @@ static int recv_time(int s, void *rbuf, int len, unsigned int flags,
     FD_ZERO(&fdset);
     FD_SET(s, &fdset);
     
-    tmv.tv_sec  = timeout_ms/1000;
+    tmv.tv_sec  = timeout_us / 1000000;
-    tmv.tv_usec = (timeout_ms%1000)*1000;
+    tmv.tv_usec = timeout_us % 1000000;
     
     do {
       rv = select(s+1, &fdset, NULL, NULL, &tmv);
@@ -278,7 +278,7 @@ main(int argc, char **argv)
   
   openlog(__progname, LOG_PID|LOG_NDELAY, LOG_DAEMON);
   
-  while ((c = getopt(argc, argv, "cspvVla:u:U:r:t:m:")) != -1)
+  while ((c = getopt(argc, argv, "cspvVla:u:U:r:t:T:m:")) != -1)
     switch (c) {
     case 'c':
       cancreate = 1;
@@ -298,6 +298,18 @@ main(int argc, char **argv)
     case 't':
       waittime = atoi(optarg);
       break;
+    case 'T':
+      {
+	char *vp;
+	unsigned long tov = strtoul(optarg, &vp, 10);
+	if ( tov < 10000UL || tov > 255000000UL || *vp ) {
+	  syslog(LOG_ERR, "Bad timeout value: %s", optarg);
+	  exit(EX_USAGE);
+	}
+	rexmtval = timeout = tov;
+	maxtimeout = rexmtval*TIMEOUT_LIMIT;
+      }
+      break;
     case 'u':
       user = optarg;
       break;
@@ -888,7 +900,7 @@ set_timeout(char *val, char **ret)
   if ( to < 1 || to > 255 || *vend )
     return 0;
   
-  rexmtval = timeout = to;
+  rexmtval = timeout = to*1000000UL;
   maxtimeout = rexmtval*TIMEOUT_LIMIT;
   
   sprintf(*ret = b_ret, "%lu", to);
@@ -908,7 +920,7 @@ set_utimeout(char *val, char **ret)
   if ( to < 10000UL || to > 255000000UL || *vend )
     return 0;
   
-  rexmtval = timeout = to/1000UL;
+  rexmtval = timeout = to;
   maxtimeout = rexmtval*TIMEOUT_LIMIT;
   
   sprintf(*ret = b_ret, "%lu", to);