--- tftpd/src/srv.c	2014/02/17 14:28:29	1.2
+++ tftpd/src/srv.c	2014/02/20 14:15:57	1.2.2.4
@@ -63,7 +63,14 @@ txData(sched_task_t *task)
 	n = htons(cli.seq);
 	rpack_uint16(pkt, &n, 0);
 
-	len = pread(cli.fd, RPACK_NEXT(pkt), cli.siz, (cli.seq - 1) * cli.siz);
+	/* max file size check */
+	if (cli.tsiz && cli.tsiz <= cli.seq * cli.siz) {
+		len = MAX(0, cli.tsiz - (cli.seq - 1) * cli.siz);
+		cli.close = 42;	/* last sended packet, should be close! */
+	} else
+		len = cli.siz;
+
+	len = pread(cli.fd, RPACK_NEXT(pkt), len, (cli.seq - 1) * cli.siz);
 	if (len == -1) {
 		ESYSERR(0);
 		code = htole16(3);
@@ -116,7 +123,86 @@ txAck(sched_task_t *task)
 	taskExit(task, NULL);
 }
 
+static int
+getOpts(rpack_t * __restrict pkt)
+{
+	char *opt, *val;
+	int len;
+
+	do {
+		/* option */
+		len = str_getString(RPACK_NEXT(pkt), RPACK_REMAIN(pkt), NULL);
+		if (len == -1)
+			return -1;
+		opt = (char*) rpack_rnext(pkt, len);
+		if (!opt)
+			return -1;
+		/* value */
+		len = str_getString(RPACK_NEXT(pkt), RPACK_REMAIN(pkt), NULL);
+		if (len == -1)
+			return -1;
+		val = (char*) rpack_rnext(pkt, len);
+		if (!val)
+			return -1;
+
+		if (!strcasecmp(opt, TFTP_OPT_BLKSIZE)) {
+			len = strtol(val, NULL, 10);
+			if (len > TFTP_LOAD_MAX)
+				cli.siz = len;
+		} else if (!strcasecmp(opt, TFTP_OPT_TSIZE))
+			cli.tsiz = strtoll(val, NULL, 10);
+		else if (!strcasecmp(opt, TFTP_OPT_TIMEOUT))
+			cli.tout = strtol(val, NULL, 10);
+		else
+			return -1;
+	} while (!RPACK_ISEND(pkt));
+
+	EVERBOSE(4, "blksize=%u tsize=%llu timeout=%u", cli.siz, cli.tsiz, cli.tout);
+	return 0;
+}
+
 static void *
+txOack(sched_task_t *task)
+{
+	rpack_t *pkt = TASK_DATA(task);
+	u_short n = htons(TFTP_OPC_OACK);
+	struct stat sb;
+	char szStr[STRSIZ];
+
+	ETRACE();
+
+	RPACK_REWIND(pkt);
+	rpack_uint16(pkt, &n, 0);
+
+	/* if opcode is RRQ and tsize is 0 then we must return file size to client */
+	if (cli.opc == TFTP_OPC_RRQ && !cli.tsiz && stat(cli.file, &sb) != -1)
+		cli.tsiz = sb.st_size;
+
+	if (cli.siz > TFTP_LOAD_MAX) {
+		memset(szStr, 0, sizeof szStr);
+		snprintf(szStr, sizeof szStr, "%u", cli.siz);
+		rpack_rdata(pkt, TFTP_OPT_BLKSIZE, strlen(TFTP_OPT_BLKSIZE) + 1);
+		rpack_rdata(pkt, szStr, strlen(szStr) + 1);
+	}
+	if (cli.tsiz) {
+		memset(szStr, 0, sizeof szStr);
+		snprintf(szStr, sizeof szStr, "%llu", cli.tsiz);
+		rpack_rdata(pkt, TFTP_OPT_TSIZE, strlen(TFTP_OPT_TSIZE) + 1);
+		rpack_rdata(pkt, szStr, strlen(szStr) + 1);
+	}
+	if (cli.tout) {
+		memset(szStr, 0, sizeof szStr);
+		snprintf(szStr, sizeof szStr, "%u", cli.tout);
+		rpack_rdata(pkt, TFTP_OPT_TIMEOUT, strlen(TFTP_OPT_TIMEOUT) + 1);
+		rpack_rdata(pkt, szStr, strlen(szStr) + 1);
+	}
+
+	schedEvent(TASK_ROOT(task), txPkt, NULL, TASK_FD(task), 
+			TASK_DATA(task), RPACK_OFF(pkt));
+	taskExit(task, NULL);
+}
+
+static void *
 RQ(sched_task_t *task)
 {
 	rpack_t *pkt = TASK_DATA(task);
@@ -168,6 +254,11 @@ RQ(sched_task_t *task)
 			EVERBOSE(2, "WRQ:: file=%s mode=%s\n", cli.file, cli.mode);
 			break;
 	}
+
+	if (!RPACK_ISEND(pkt) && !getOpts(pkt))
+		schedEvent(TASK_ROOT(task), txOack, NULL, TASK_FD(task), 
+				TASK_DATA(task), 0);
+
 	cli.fd = open(cli.file, code, 0644);
 	if (cli.fd == -1) {
 		if (errno == EACCES)
@@ -283,7 +374,10 @@ DATA(sched_task_t *task)
 	} else
 		cli.seq = ntohs(code);
 
+	/* max file size check */
 	len = TASK_DATLEN(task) - RPACK_OFF(pkt);
+	if (cli.tsiz && cli.tsiz <= cli.seq * cli.siz)
+		len = MIN(len, cli.tsiz - (cli.seq - 1) * cli.siz);
 	if (len < cli.siz)
 		cli.close = 42;	/* last received packet, should be close! */