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authorGravatar Glenn L McGrath <bug1@ihug.co.nz>2004-03-05 15:52:57 +0000
committerGravatar Glenn L McGrath <bug1@ihug.co.nz>2004-03-05 15:52:57 +0000
commitdb6ee81c994c7571a80a5e37c6a331a69e5dccde (patch)
tree4063bb110b5b3e46bc9ba936c130128aa47fb85d /patches
parentec58bce3638b73013f7bbdce3047ce0797de079c (diff)
downloadbusybox-db6ee81c994c7571a80a5e37c6a331a69e5dccde.tar.gz
busybox-db6ee81c994c7571a80a5e37c6a331a69e5dccde.tar.bz2
Patch from John Powers, adds multicast (rfc2090) and timeout (rfc2349)
options
Diffstat (limited to 'patches')
-rw-r--r--patches/tftp_timeout_multicast.diff1053
1 files changed, 1053 insertions, 0 deletions
diff --git a/patches/tftp_timeout_multicast.diff b/patches/tftp_timeout_multicast.diff
new file mode 100644
index 000000000..a76a18c61
--- /dev/null
+++ b/patches/tftp_timeout_multicast.diff
@@ -0,0 +1,1053 @@
+Index: AUTHORS
+===================================================================
+RCS file: /var/cvs/busybox/AUTHORS,v
+retrieving revision 1.40
+diff -u -r1.40 AUTHORS
+--- a/AUTHORS 9 Oct 2003 21:19:21 -0000 1.40
++++ b/AUTHORS 5 Mar 2004 15:45:47 -0000
+@@ -92,6 +92,9 @@
+ Original author of BusyBox in 1995, 1996. Some of his code can
+ still be found hiding here and there...
+
++John Powers <jpp@ti.com>
++ Added multicast option (rfc2090) and timeout option (rfc2349) to tftp.
++
+ Tim Riker <Tim@Rikers.org>
+ bug fixes, member of fan club
+
+Index: include/usage.h
+===================================================================
+RCS file: /var/cvs/busybox/include/usage.h,v
+retrieving revision 1.191
+diff -u -r1.191 usage.h
+--- a/include/usage.h 25 Feb 2004 10:35:55 -0000 1.191
++++ b/include/usage.h 5 Mar 2004 15:45:59 -0000
+@@ -2492,6 +2492,21 @@
+ #else
+ #define USAGE_TFTP_BS(a)
+ #endif
++#ifdef CONFIG_FEATURE_TFTP_TIMEOUT
++ #define USAGE_TFTP_TIMEOUT(a) a
++#else
++ #define USAGE_TFTP_TIMEOUT(a)
++#endif
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ #define USAGE_TFTP_MULTICAST(a) a
++#else
++ #define USAGE_TFTP_MULTICAST(a)
++#endif
++#ifdef CONFIG_FEATURE_TFTP_DEBUG
++ #define USAGE_TFTP_DEBUG(a) a
++#else
++ #define USAGE_TFTP_DEBUG(a)
++#endif
+
+ #define tftp_trivial_usage \
+ "[OPTION]... HOST [PORT]"
+@@ -2508,6 +2523,16 @@
+ ) \
+ USAGE_TFTP_BS( \
+ "\t-b SIZE\tTransfer blocks of SIZE octets.\n" \
++ ) \
++ USAGE_TFTP_TIMEOUT( \
++ "\t-T SEC\tClient timeout SEC seconds (default: 5).\n" \
++ "\t-t SEC\tServer timeout SEC seconds\n" \
++ ) \
++ USAGE_TFTP_MULTICAST( \
++ "\t-m\tMulticast get file.\n" \
++ ) \
++ USAGE_TFTP_DEBUG( \
++ "\t-D\tPrint debug messages.\n" \
+ )
+ #define time_trivial_usage \
+ "[OPTION]... COMMAND [ARGS...]"
+Index: networking/Config.in
+===================================================================
+RCS file: /var/cvs/busybox/networking/Config.in,v
+retrieving revision 1.27
+diff -u -r1.27 Config.in
+--- a/networking/Config.in 22 Feb 2004 12:25:47 -0000 1.27
++++ b/networking/Config.in 5 Mar 2004 15:45:59 -0000
+@@ -522,6 +522,13 @@
+ Add support for the GET command within the TFTP client. This allows
+ a client to retrieve a file from a TFTP server.
+
++config CONFIG_FEATURE_TFTP_MULTICAST
++ bool " Enable \"multicast\" option"
++ default n
++ depends on CONFIG_FEATURE_TFTP_GET
++ help
++ Allow the client to receive multicast file transfers.
++
+ config CONFIG_FEATURE_TFTP_PUT
+ bool " Enable \"put\" command"
+ default y
+@@ -531,12 +538,19 @@
+ a client to transfer a file to a TFTP server.
+
+ config CONFIG_FEATURE_TFTP_BLOCKSIZE
+- bool " Enable \"blocksize\" command"
++ bool " Enable \"blksize\" option"
+ default n
+ depends on CONFIG_TFTP
+ help
+ Allow the client to specify the desired block size for transfers.
+
++config CONFIG_FEATURE_TFTP_TIMEOUT
++ bool " Enable \"timeout\" option"
++ default n
++ depends on CONFIG_TFTP
++ help
++ Allow the client to negotiate timeout option with server.
++
+ config CONFIG_FEATURE_TFTP_DEBUG
+ bool " Enable debug"
+ default n
+Index: networking/tftp.c
+===================================================================
+RCS file: /var/cvs/busybox/networking/tftp.c,v
+retrieving revision 1.25
+diff -u -r1.25 tftp.c
+--- a/networking/tftp.c 5 Mar 2004 13:04:39 -0000 1.25
++++ b/networking/tftp.c 5 Mar 2004 15:46:00 -0000
+@@ -1,11 +1,26 @@
++/* vi: set sw=4 ts=4: */
+ /* ------------------------------------------------------------------------- */
+ /* tftp.c */
++/* Copyright (c) 2003, 2004 Texas Instruments */
++/* */
++/* This package is free software; you can redistribute it and/or */
++/* modify it under the terms of the license found in the file */
++/* named COPYING that should have accompanied this file. */
++/* */
++/* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
++/* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
++/* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */
+ /* */
+ /* A simple tftp client for busybox. */
+ /* Tries to follow RFC1350. */
+ /* Only "octet" mode supported. */
+ /* Optional blocksize negotiation (RFC2347 + RFC2348) */
+ /* */
++/* New features added at Texas Instruments, October 2003 */
++/* Author: John Powers */
++/* Multicast option: rfc2090 */
++/* Timeout option: rfc2349 */
++/* */
+ /* Copyright (C) 2001 Magnus Damm <damm@opensource.se> */
+ /* */
+ /* Parts of the code based on: */
+@@ -46,8 +61,20 @@
+
+ #include "busybox.h"
+
++#if defined(CONFIG_FEATURE_TFTP_BLOCKSIZE) || defined(CONFIG_FEATURE_TFTP_MULTICAST) || defined(CONFIG_FEATURE_TFTP_TIMEOUT)
++ #define TFTP_OPTIONS
++#endif
++
+ //#define CONFIG_FEATURE_TFTP_DEBUG
+
++#ifdef CONFIG_FEATURE_TFTP_DEBUG
++ static void printtime(void);
++ #define dprintf(fmt...) if (debug) {printtime(); printf(fmt);}
++ int debug = 0;
++#else
++ #define dprintf(fmt...)
++#endif
++
+ #define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
+ #define TFTP_TIMEOUT 5 /* seconds */
+
+@@ -68,12 +95,24 @@
+ "Illegal TFTP operation",
+ "Unknown transfer ID",
+ "File already exists",
+- "No such user"
++ "No such user",
++#ifdef TFTP_OPTIONS
++ "Unsupported option",
++#endif
+ };
+
+ const int tftp_cmd_get = 1;
+ const int tftp_cmd_put = 2;
+
++
++struct tftp_option {
++ int multicast;
++ int blksize;
++ int client_timeout;
++ int server_timeout;
++};
++
++
+ #ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+
+ static int tftp_blocksize_check(int blocksize, int bufsize)
+@@ -93,16 +132,158 @@
+ return blocksize;
+ }
+
++#endif
++
++#ifdef CONFIG_FEATURE_TFTP_TIMEOUT
++
++static int
++tftp_timeout_check(int timeout)
++{
++ /* Check if timeout seconds is valid:
++ * RFC2349 says between 1 and 255.
++ */
++
++ if (timeout < 1 || timeout > 255) {
++ bb_error_msg("bad timeout value");
++ return 0;
++ }
++ return timeout;
++}
++
++#endif
++
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++static int
++tftp_multicast_check(const char *opt, char **phost, unsigned short *pport, int *pactive)
++{
++ /* Option string contains comma delimited addr,port,active.
++ * addr = multicast IP address
++ * port = port number
++ * active = 1 if active client
++ * 0 if passive client
++ *
++ * Addr and port will be empty fields when the server notifies a
++ * passive client that it is now the active client.
++ *
++ * The host address string must be freed by the caller. Neither host
++ * nor port will be set/changed if the input fields are empty.
++ *
++ * If any tokenization errors occur in the opt string, the host
++ * address string is automatically freed.
++ *
++ * Return 0 if any tokenization error, 1 if all parameters are good.
++ */
++
++ char *token = NULL;
++ char *parse_buf = NULL;
++ char *tokenv = NULL;
++ char *host = NULL;
++ int port;
++ int active;
++
++ parse_buf = bb_xstrdup(opt);
++
++ dprintf("multicast option=%s\n", opt);
++
++ /* IP address */
++ if ((token = strtok_r(parse_buf, ",", &tokenv)) == NULL) {
++ dprintf("tftp_multicast_check: cannot parse IP address from %s\n", parse_buf);
++ free(parse_buf);
++ return 0;
++ }
++ if (strlen(token) > 0)
++ *phost = host = bb_xstrdup(token);
++
++ /* Port */
++ if ((token = strtok_r(NULL, ",", &tokenv)) == NULL) {
++ dprintf("tftp_multicast_check: cannot parse port number from %s\n", tokenv);
++ goto token_error;
++ }
++ if (strlen(token) > 0) {
++ port = atoi(token);
++ if (port < 0 || port > 0xFFFF) {
++ dprintf("tftp_multicast_check: bad port number (%d)\n", port);
++ goto token_error;
++ }
++ *pport = htons(port);
++ }
++
++ /* Active/passive */
++ if ((token = strtok_r(NULL, ",", &tokenv)) == NULL) {
++ dprintf("tftp_multicast_check: cannot parse active/passive from %s\n", tokenv);
++ goto token_error;
++ }
++ active = atoi(token);
++ if (active != 0 && active != 1) {
++ dprintf("tftp_multicast_check: bad active/passive flag (%d)\n", active);
++ goto token_error;
++ }
++ *pactive = active;
++
++ free(parse_buf);
++ return 1;
++
++token_error:
++ free(parse_buf);
++ if (host != NULL)
++ free(host);
++ *phost = NULL;
++ return 0;
++
++}
++
++#define VECTOR_QUANTUM_WIDTH 8
++#define VECTOR_QUANTUM_ALL_ONES ((1<<VECTOR_QUANTUM_WIDTH)-1)
++
++static void inline
++bit_set(int bit, unsigned char *vector)
++{
++ int offset = bit / VECTOR_QUANTUM_WIDTH;
++ int mask = 1 << (bit % VECTOR_QUANTUM_WIDTH);
++ vector[offset] |= mask;
++}
++
++static int inline
++bit_isset(int bit, const unsigned char *vector)
++{
++ int offset = bit / VECTOR_QUANTUM_WIDTH;
++ int mask = 1 << (bit % VECTOR_QUANTUM_WIDTH);
++ return vector[offset] & mask ? 1 : 0;
++}
++
++static int inline
++bit_lmz(const unsigned char *vector)
++{
++ /* Return number of left-most zero in bit vector */
++ const unsigned char *vp = vector;
++ int i;
++ unsigned char velem;
++
++ while (*vp == VECTOR_QUANTUM_ALL_ONES)
++ vp++;
++ velem = *vp;
++ for (i = 0; i < VECTOR_QUANTUM_WIDTH; i++) {
++ if ((velem & (1 << i)) == 0)
++ break;
++ }
++ dprintf("bit_lmz: block=%d\n", (vp - vector)*VECTOR_QUANTUM_WIDTH + i);
++ return (vp - vector)*VECTOR_QUANTUM_WIDTH + i;
++}
++
++#endif
++
++
++
++#ifdef TFTP_OPTIONS
++
+ static char *tftp_option_get(char *buf, int len, char *option)
+ {
+- int opt_val = 0;
++ int opt_val = 0;
+ int opt_found = 0;
+ int k;
+-
+- while (len > 0) {
+
++ while (len > 0) {
+ /* Make sure the options are terminated correctly */
+-
+ for (k = 0; k < len; k++) {
+ if (buf[k] == '\0') {
+ break;
+@@ -117,9 +298,8 @@
+ if (strcasecmp(buf, option) == 0) {
+ opt_found = 1;
+ }
+- }
+- else {
+- if (opt_found) {
++ } else {
++ if (opt_found) {
+ return buf;
+ }
+ }
+@@ -138,7 +318,8 @@
+ #endif
+
+ static inline int tftp(const int cmd, const struct hostent *host,
+- const char *remotefile, int localfd, const unsigned short port, int tftp_bufsize)
++ const char *remotefile, int localfd, const unsigned short port,
++ struct tftp_option *option)
+ {
+ const int cmd_get = cmd & tftp_cmd_get;
+ const int cmd_put = cmd & tftp_cmd_put;
+@@ -155,18 +336,29 @@
+ int len;
+ int opcode = 0;
+ int finished = 0;
+- int timeout = bb_tftp_num_retries;
++ int retry = bb_tftp_num_retries;
+ unsigned short block_nr = 1;
+
+-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+- int want_option_ack = 0;
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ struct hostent *mchost;
++ struct sockaddr_in mcsa;
++ char *mchostname;
++ unsigned short mcport;
++ unsigned char *mcblockmap = NULL;
++ int master_client = 1;
++ int mcfd = -1;
++ int mcmaxblock = 0x10000;
++ int ack_oack = 0;
++#else
++ #define master_client 1
++ #define ack_oack 0
+ #endif
+
+ /* Can't use RESERVE_CONFIG_BUFFER here since the allocation
+ * size varies meaning BUFFERS_GO_ON_STACK would fail */
+- char *buf=xmalloc(tftp_bufsize + 4);
++ char *buf=xmalloc(option->blksize + 4);
+
+- tftp_bufsize += 4;
++ int tftp_bufsize = option->blksize + 4;
+
+ if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
+ bb_perror_msg("socket");
+@@ -183,15 +375,21 @@
+ memcpy(&sa.sin_addr, (struct in_addr *) host->h_addr,
+ sizeof(sa.sin_addr));
+
+- /* build opcode */
+-
+- if (cmd_get) {
+- opcode = TFTP_RRQ;
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ if (option->multicast) {
++ const int bmsize = 0x10000 / VECTOR_QUANTUM_WIDTH;
++ if ((mcfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
++ bb_perror_msg("multicast socket");
++ return EXIT_FAILURE;
++ }
++ mcblockmap = xmalloc(bmsize+1);
++ memset(mcblockmap, 0, bmsize+1);
+ }
++#endif
+
+- if (cmd_put) {
+- opcode = TFTP_WRQ;
+- }
++ /* build opcode */
++
++ opcode = cmd_get ? TFTP_RRQ : TFTP_WRQ;
+
+ while (1) {
+
+@@ -203,7 +401,7 @@
+
+ cp += 2;
+
+- /* add filename and mode */
++ /* First packet of file transfer includes file name, mode, and options */
+
+ if ((cmd_get && (opcode == TFTP_RRQ)) ||
+ (cmd_put && (opcode == TFTP_WRQ))) {
+@@ -223,7 +421,7 @@
+ }
+
+ if (too_long || ((&buf[tftp_bufsize - 1] - cp) < 6)) {
+- bb_error_msg("too long remote-filename");
++ bb_error_msg("too long: remote filename");
+ break;
+ }
+
+@@ -238,8 +436,8 @@
+
+ if (len != TFTP_BLOCKSIZE_DEFAULT) {
+
+- if ((&buf[tftp_bufsize - 1] - cp) < 15) {
+- bb_error_msg("too long remote-filename");
++ if ((&buf[tftp_bufsize - 1] - cp) < 15) {
++ bb_error_msg("buffer too small for blksize option");
+ break;
+ }
+
+@@ -249,16 +447,65 @@
+ cp += 8;
+
+ cp += snprintf(cp, 6, "%d", len) + 1;
++ }
++#endif
++
++
++
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++
++ if (option->multicast) {
++ if ((&buf[tftp_bufsize - 1] - cp) < 12) {
++ bb_error_msg("buffer too small for multicast option");
++ break;
++ }
++
++ /* add "multicast" option */
+
+- want_option_ack = 1;
++ memcpy(cp, "multicast\0", 11);
++ cp += 11;
++
++ option->multicast = 0; /* turn back on when server accepts option */
++ ack_oack = 1; /* acknowledge OACK */
+ }
++
+ #endif
++
++#ifdef CONFIG_FEATURE_TFTP_TIMEOUT
++
++ if (option->server_timeout != TFTP_TIMEOUT) {
++ if ((&buf[tftp_bufsize - 1] - cp) < 12) {
++ bb_error_msg("buffer too small for timeout option");
++ break;
++ }
++
++ /* add "timeout" option */
++
++ memcpy(cp, "timeout", 8);
++ cp += 8;
++
++ cp += snprintf(cp, 4, "%d", option->server_timeout) + 1;
++ }
++#endif
++
+ }
+
+ /* add ack and data */
+
+- if ((cmd_get && (opcode == TFTP_ACK)) ||
+- (cmd_put && (opcode == TFTP_DATA))) {
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ else if (option->multicast && opcode == TFTP_ACK) {
++ if (master_client || ack_oack) {
++ int blocknum = bit_lmz(mcblockmap);
++ *((unsigned short *) cp) = htons(blocknum);
++ cp += 2;
++ if (blocknum >= mcmaxblock)
++ finished = 1;
++ dprintf("ack block %d/%d %s\n", blocknum, mcmaxblock, finished? "finished": "");
++ }
++ }
++#endif
++ else if ((cmd_get && opcode == TFTP_ACK) ||
++ (cmd_put && opcode == TFTP_DATA)) {
+
+ *((unsigned short *) cp) = htons(block_nr);
+
+@@ -275,7 +522,7 @@
+ }
+
+ if (len != (tftp_bufsize - 4)) {
+- finished++;
++ finished = 1;
+ }
+
+ cp += len;
+@@ -283,82 +530,119 @@
+ }
+
+
+- /* send packet */
++ /* send packet and receive reply */
+
+
+- timeout = bb_tftp_num_retries; /* re-initialize */
++ retry = bb_tftp_num_retries; /* re-initialize */
+ do {
+-
++ int selectrc;
+ len = cp - buf;
+
+-#ifdef CONFIG_FEATURE_TFTP_DEBUG
+- fprintf(stderr, "sending %u bytes\n", len);
+- for (cp = buf; cp < &buf[len]; cp++)
+- fprintf(stderr, "%02x ", (unsigned char)*cp);
+- fprintf(stderr, "\n");
+-#endif
+- if (sendto(socketfd, buf, len, 0,
+- (struct sockaddr *) &sa, sizeof(sa)) < 0) {
+- bb_perror_msg("send");
+- len = -1;
+- break;
+- }
+-
++ /* send packet */
++ if ((len > 2) && (! option->multicast || master_client || ack_oack)) {
+
+- if (finished && (opcode == TFTP_ACK)) {
+- break;
++#ifdef CONFIG_FEATURE_TFTP_DEBUG
++ dprintf("sending %u bytes\n", len);
++ for (cp = buf; cp < &buf[len]; cp++)
++ if (debug)
++ printf("%02x ", *(unsigned char *)cp);
++ if (debug)
++ printf("\n");
++#endif
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ ack_oack = 0;
++#endif
++ if (sendto(socketfd, buf, len, 0, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
++ bb_perror_msg("send");
++ len = -1;
++ break;
++ }
++ if (finished && opcode == TFTP_ACK) {
++ break;
++ }
+ }
+
+- /* receive packet */
++ /* receive reply packet */
+
+ memset(&from, 0, sizeof(from));
+ fromlen = sizeof(from);
+
+- tv.tv_sec = TFTP_TIMEOUT;
++ tv.tv_sec = option->client_timeout;
+ tv.tv_usec = 0;
+
+ FD_ZERO(&rfds);
+ FD_SET(socketfd, &rfds);
++ dprintf("set to receive from socketfd (%d)\n", socketfd);
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ if (option->multicast) {
++ FD_SET(mcfd, &rfds);
++ dprintf("set to receive from mcfd (%d)\n", mcfd);
++ }
++#endif
+
+- switch (select(FD_SETSIZE, &rfds, NULL, NULL, &tv)) {
+- case 1:
+- len = recvfrom(socketfd, buf, tftp_bufsize, 0,
+- (struct sockaddr *) &from, &fromlen);
+-
+- if (len < 0) {
+- bb_perror_msg("recvfrom");
+- break;
++ dprintf("select\n");
++ selectrc = select(FD_SETSIZE, &rfds, NULL, NULL, &tv);
++ if (selectrc > 0) {
++ /* A packet was received */
++ if (FD_ISSET(socketfd, &rfds)) { /* Unicast packet */
++ dprintf("from socketfd\n");
++ len = recvfrom(socketfd, buf, tftp_bufsize, 0, (struct sockaddr *) &from, &fromlen);
++
++ if (len < 0) {
++ bb_perror_msg("recvfrom");
++ } else {
++ if (sa.sin_port == port) {
++ sa.sin_port = from.sin_port;
++ }
++ if (sa.sin_port == from.sin_port) {
++ retry = 0;
++ } else {
++ /* bad packet */
++ /* discard the packet - treat as timeout */
++ retry = bb_tftp_num_retries;
++ bb_error_msg("timeout");
++ }
++ }
+ }
+
+- timeout = 0;
+-
+- if (sa.sin_port == port) {
+- sa.sin_port = from.sin_port;
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ else if (option->multicast && FD_ISSET(mcfd, &rfds)) { /* Multicast packet */
++ dprintf("from mcfd\n");
++ len = recvfrom(mcfd, buf, tftp_bufsize, 0, (struct sockaddr *) &from, &fromlen);
++ if (len < 0) {
++ bb_perror_msg("multicast recvfrom");
++ } else {
++ if (mcsa.sin_port == mcport) {
++ mcsa.sin_port = from.sin_port;
++ }
++ if (mcsa.sin_port == from.sin_port) {
++ retry = 0;
++ } else {
++ retry = bb_tftp_num_retries;
++ bb_error_msg("multicast timeout");
++ }
++ }
+ }
+- if (sa.sin_port == from.sin_port) {
+- break;
+- }
+-
+- /* fall-through for bad packets! */
+- /* discard the packet - treat as timeout */
+- timeout = bb_tftp_num_retries;
++#endif
+
+- case 0:
++ } else if (selectrc == 0) {
++ /* Time out */
++ dprintf("timeout\n");
+ bb_error_msg("timeout");
+
+- timeout--;
+- if (timeout == 0) {
++ retry--;
++ if (retry == 0) {
+ len = -1;
+ bb_error_msg("last timeout");
+ }
+- break;
+-
+- default:
++ } else {
++ /* Error condition */
++ dprintf("error\n");
+ bb_perror_msg("select");
+ len = -1;
+ }
+
+- } while (timeout && (len >= 0));
++ } while (retry && len >= 0);
+
+ if ((finished) || (len < 0)) {
+ break;
+@@ -370,9 +654,8 @@
+ opcode = ntohs(*((unsigned short *) buf));
+ tmp = ntohs(*((unsigned short *) &buf[2]));
+
+-#ifdef CONFIG_FEATURE_TFTP_DEBUG
+- fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, tmp);
+-#endif
++ dprintf("received %d bytes: %04x %04x\n", len, opcode, tmp);
++ dprintf("master_client=%d\n", master_client);
+
+ if (opcode == TFTP_ERROR) {
+ char *msg = NULL;
+@@ -393,55 +676,116 @@
+ break;
+ }
+
+-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+- if (want_option_ack) {
++#ifdef TFTP_OPTIONS
+
+- want_option_ack = 0;
++ if (opcode == TFTP_OACK) {
+
+- if (opcode == TFTP_OACK) {
++ /* server seems to support options */
+
+- /* server seems to support options */
++ char *res;
++
++ block_nr = 0; /* acknowledge option packet with block number 0 */
++ opcode = cmd_put ? TFTP_DATA : TFTP_ACK;
+
+- char *res;
+
+- res = tftp_option_get(&buf[2], len-2,
+- "blksize");
++#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
++ res = tftp_option_get(&buf[2], len-2, "blksize");
+
+- if (res) {
+- int blksize = atoi(res);
+-
+- if (tftp_blocksize_check(blksize,
+- tftp_bufsize - 4)) {
++ if (res) {
++ int blksize = atoi(res);
+
+- if (cmd_put) {
+- opcode = TFTP_DATA;
+- }
+- else {
+- opcode = TFTP_ACK;
+- }
+-#ifdef CONFIG_FEATURE_TFTP_DEBUG
+- fprintf(stderr, "using blksize %u\n", blksize);
++ if (tftp_blocksize_check(blksize, tftp_bufsize - 4)) {
++ dprintf("using blksize %d\n", blksize);
++ tftp_bufsize = blksize + 4;
++ free(buf);
++ buf = xmalloc(tftp_bufsize);
++ } else {
++ bb_error_msg("bad blksize %d", blksize);
++ break;
++ }
++ }
+ #endif
+- tftp_bufsize = blksize + 4;
+- block_nr = 0;
+- continue;
+- }
+- }
+- /* FIXME:
+- * we should send ERROR 8 */
+- bb_error_msg("bad server option");
+- break;
+- }
+
+- bb_error_msg("warning: blksize not supported by server"
+- " - reverting to 512");
+
+- tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4;
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ res = tftp_option_get(&buf[2], len-2, "multicast");
++
++ if (res) {
++ ack_oack = 1;
++ if (tftp_multicast_check(res, &mchostname, &mcport, &master_client)) {
++ struct ip_mreq mreq;
++ struct in_addr mcaddr;
++
++ dprintf("using multicast\n");
++
++ mchost = xgethostbyname(mchostname);
++ if (mchost) {
++ memcpy(&mcaddr, mchost->h_addr, mchost->h_length);
++ if (! IN_MULTICAST(ntohl(mcaddr.s_addr))) {
++ bb_error_msg("bad multicast address: %s", mchostname);
++ break;
++ }
++ } else {
++ bb_error_msg("bad multicast address: %s", mchostname);
++ break;
++ }
++
++ memset(&mcsa, 0, sizeof(mcsa));
++ mcsa.sin_family = AF_INET;
++ mcsa.sin_addr.s_addr = htonl(INADDR_ANY);
++ mcsa.sin_port = mcport;
++
++ bind(mcfd, (struct sockaddr *)&mcsa, sizeof(mcsa));
++
++ mreq.imr_multiaddr.s_addr = mcaddr.s_addr;
++ mreq.imr_interface.s_addr = htonl(INADDR_ANY);
++
++ if (setsockopt(mcfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
++ {
++ bb_error_msg("setsockopt");
++ break;
++ }
++
++ option->multicast = 1;
++ } else {
++ bb_error_msg("bad multicast option value: %s", res);
++ break;
++ }
++ }
++#endif
++
+ }
++ else
+ #endif
+
+ if (cmd_get && (opcode == TFTP_DATA)) {
+
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ if (option->multicast) {
++ int bn = tmp - 1;
++ /* Do I need this block? */
++ if (! bit_isset(bn, mcblockmap)) {
++ lseek(localfd, bn*(tftp_bufsize-4), SEEK_SET);
++ len = write(localfd, &buf[4], len-4);
++ if (len < 0) {
++ bb_perror_msg("write");
++ break;
++ }
++ bit_set(bn, mcblockmap);
++ if (len != (tftp_bufsize-4)) {
++ mcmaxblock = tmp;
++ dprintf("mcmaxblock=%d, (len(%d) != tftp_bufsize-4(%d))\n", mcmaxblock, len, tftp_bufsize-4);
++ }
++ opcode = TFTP_ACK;
++ }
++ /* Do not acknowledge block if I already have a copy of the block. A situation can arise when the server
++ * and client timeout nearly simultaneously. The server retransmits the block at the same time the client
++ * re-requests the block. From then on out, each block is transmitted twice--not a good use of bandwidth.
++ */
++ }
++ else
++#endif
++
+ if (tmp == block_nr) {
+
+ len = write(localfd, &buf[4], len - 4);
+@@ -452,15 +796,14 @@
+ }
+
+ if (len != (tftp_bufsize - 4)) {
+- finished++;
++ finished = 1;
+ }
+
+ opcode = TFTP_ACK;
+- continue;
+ }
+ }
+
+- if (cmd_put && (opcode == TFTP_ACK)) {
++ else if (cmd_put && opcode == TFTP_ACK) {
+
+ if (tmp == (unsigned short)(block_nr - 1)) {
+ if (finished) {
+@@ -468,15 +811,19 @@
+ }
+
+ opcode = TFTP_DATA;
+- continue;
+ }
+ }
+ }
+
+ #ifdef CONFIG_FEATURE_CLEAN_UP
+ close(socketfd);
++ free(buf);
++
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ if (mcblockmap != NULL)
++ free(mcblockmap);
++#endif
+
+- free(buf);
+ #endif
+
+ return finished ? EXIT_SUCCESS : EXIT_FAILURE;
+@@ -487,13 +834,18 @@
+ struct hostent *host = NULL;
+ char *localfile = NULL;
+ char *remotefile = NULL;
+- int port;
++ unsigned short port;
+ int cmd = 0;
+ int fd = -1;
+ int flags = 0;
+ int opt;
+ int result;
+- int blocksize = TFTP_BLOCKSIZE_DEFAULT;
++ struct tftp_option option = {
++ .multicast = 0,
++ .blksize = TFTP_BLOCKSIZE_DEFAULT,
++ .client_timeout = TFTP_TIMEOUT,
++ .server_timeout = TFTP_TIMEOUT,
++ };
+
+ /* figure out what to pass to getopt */
+
+@@ -515,13 +867,45 @@
+ #define PUT
+ #endif
+
+- while ((opt = getopt(argc, argv, BS GET PUT "l:r:")) != -1) {
++#ifdef CONFIG_FEATURE_TFTP_TIMEOUT
++#define TO "T:t:"
++#else
++#define TO
++#endif
++
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++#define MC "m"
++#else
++#define MC
++#endif
++
++#ifdef CONFIG_FEATURE_TFTP_DEBUG
++#define DB "D"
++#else
++#define DB
++#endif
++
++ while ((opt = getopt(argc, argv, BS GET PUT TO MC DB "l:r:")) != -1) {
+ switch (opt) {
+ #ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+ case 'b':
+- blocksize = atoi(optarg);
+- if (!tftp_blocksize_check(blocksize, 0)) {
+- return EXIT_FAILURE;
++ option.blksize = atoi(optarg);
++ if (!tftp_blocksize_check(option.blksize, 0)) {
++ return EXIT_FAILURE;
++ }
++ break;
++#endif
++#ifdef CONFIG_FEATURE_TFTP_TIMEOUT
++ case 'T':
++ option.client_timeout = atoi(optarg);
++ if (!tftp_timeout_check(option.client_timeout)) {
++ return EXIT_FAILURE;
++ }
++ break;
++ case 't':
++ option.server_timeout = atoi(optarg);
++ if (!tftp_timeout_check(option.server_timeout)) {
++ return EXIT_FAILURE;
+ }
+ break;
+ #endif
+@@ -537,18 +921,34 @@
+ flags = O_RDONLY;
+ break;
+ #endif
++#ifdef CONFIG_FEATURE_TFTP_MULTICAST
++ case 'm':
++ option.multicast = 1; /* receive multicast file */
++ break;
++#endif
++#ifdef CONFIG_FEATURE_TFTP_DEBUG
++ case 'D':
++ debug = 1;
++ break;
++#endif
+ case 'l':
+ localfile = bb_xstrdup(optarg);
+ break;
+ case 'r':
+ remotefile = bb_xstrdup(optarg);
+ break;
++ default:
++ bb_show_usage();
+ }
+ }
+
+ if ((cmd == 0) || (optind == argc)) {
+ bb_show_usage();
+ }
++ if (cmd == tftp_cmd_put && option.multicast) {
++ fprintf(stderr, "Multicast (-m) invalid option with put (-p) command\n");
++ exit(EXIT_FAILURE);
++ }
+ if(localfile && strcmp(localfile, "-") == 0) {
+ fd = fileno((cmd==tftp_cmd_get)? stdout : stdin);
+ }
+@@ -566,14 +966,12 @@
+ host = xgethostbyname(argv[optind]);
+ port = bb_lookup_port(argv[optind + 1], "udp", 69);
+
+-#ifdef CONFIG_FEATURE_TFTP_DEBUG
+- fprintf(stderr, "using server \"%s\", remotefile \"%s\", "
++ dprintf("using server \"%s\", remotefile \"%s\", "
+ "localfile \"%s\".\n",
+ inet_ntoa(*((struct in_addr *) host->h_addr)),
+ remotefile, localfile);
+-#endif
+
+- result = tftp(cmd, host, remotefile, fd, port, blocksize);
++ result = tftp(cmd, host, remotefile, fd, port, &option);
+
+ #ifdef CONFIG_FEATURE_CLEAN_UP
+ if (!(fd == fileno(stdout) || fd == fileno(stdin))) {
+@@ -582,3 +980,18 @@
+ #endif
+ return(result);
+ }
++
++
++#ifdef CONFIG_FEATURE_TFTP_DEBUG
++
++#include <sys/time.h>
++
++static void
++printtime(void)
++{
++ struct timeval tv;
++ gettimeofday(&tv, NULL);
++ printf("%11lu.%06lu ", tv.tv_sec, tv.tv_usec);
++}
++
++#endif