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tftpd: new applet (mostly using existing code for tftp)

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function                                             old     new   delta
tftp_protocol                                          -    1173   +1173
tftpd_main                                             -     500    +500
tftp_option_get                                        -     102    +102
packed_usage                                       23650   23662     +12
applet_names                                        1809    1815      +6
applet_main                                         1100    1104      +4
applet_nameofs                                       550     552      +2
tftp_main                                            302     301      -1
get_nport                                             32       -     -32
tftp                                                1172       -   -1172
------------------------------------------------------------------------------
(add/remove: 3/2 grow/shrink: 4/1 up/down: 1799/-1205)        Total: 594 bytes
   text    data     bss     dec     hex filename
 796479     662    7420  804561   c46d1 busybox_old
 797153     662    7420  805235   c4973 busybox_unstripped
This commit is contained in:
Denis Vlasenko 2008-03-17 09:10:39 +00:00
parent 1d42665b6b
commit aa9b1828b9
9 changed files with 274 additions and 103 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
TODO_config_nommu
View File

@ -835,14 +835,14 @@ CONFIG_SOFTLIMIT=y
# CONFIG_SESTATUS is not set
#
# print support
# Print Utilities
#
CONFIG_LPD=y
CONFIG_LPR=y
CONFIG_LPQ=y
#
# ipsvd utilities
# ipsvd Utilities
#
CONFIG_TCPSVD=y
CONFIG_UDPSVD=y

1
include/applets.h
View File

@ -355,6 +355,7 @@ USE_TELNETD(APPLET(telnetd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
USE_TEST(APPLET_NOEXEC(test, test, _BB_DIR_USR_BIN, _BB_SUID_NEVER, test))
#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
USE_TFTP(APPLET(tftp, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_TFTPD(APPLET(tftpd, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
#endif
USE_TIME(APPLET(time, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_TOP(APPLET(top, _BB_DIR_USR_BIN, _BB_SUID_NEVER))

8
include/usage.h
View File

@ -3961,7 +3961,7 @@
#define tftp_trivial_usage \
"[OPTION]... HOST [PORT]"
#define tftp_full_usage \
"Transfer a file from/to tftp server using \"octet\" mode\n" \
"Transfer a file from/to tftp server\n" \
"\nOptions:" \
"\n -l FILE Local FILE" \
"\n -r FILE Remote FILE" \
@ -3974,6 +3974,12 @@
USE_FEATURE_TFTP_BLOCKSIZE( \
"\n -b SIZE Transfer blocks of SIZE octets" \
)
#define tftpd_trivial_usage \
"[DIR]"
#define tftpd_full_usage \
"Transfer a file on request from a tftp client" \
#define time_trivial_usage \
"[OPTION]... COMMAND [ARGS...]"
#define time_full_usage \

2
ipsvd/Config.in
View File

@ -3,7 +3,7 @@
# see scripts/kbuild/config-language.txt.
#
menu "ipsvd utilities"
menu "ipsvd Utilities"
config TCPSVD
bool "tcpsvd"

2
ipsvd/tcpudp.c
View File

@ -322,7 +322,7 @@ int tcpudpsvd_main(int argc ATTRIBUTE_UNUSED, char **argv)
/* In case recv_from_to won't be able to recover local addr.
* Also sets port - recv_from_to is unable to do it. */
local = *lsa;
conn = recv_from_to(sock, NULL, 0, MSG_DONTWAIT | MSG_PEEK,
conn = recv_from_to(sock, NULL, 0, MSG_PEEK,
&remote.u.sa, &local.u.sa, sa_len);
}
sig_block(SIGCHLD);

23
networking/Config.in
View File

@ -774,28 +774,41 @@ config TFTP
is usually used for simple, small transfers such as a root image
for a network-enabled bootloader.
config TFTPD
bool "tftpd"
default n
help
This enables the Trivial File Transfer Protocol server program.
It expects that stdin is a datagram socket and a packet
is already pending on it. It will exit after one transfer.
In other words: it should be run from inetd in nowait mode,
or from udpsvd. Example: "udpsvd -E 0 69 tftpd DIR"
config FEATURE_TFTP_GET
bool "Enable \"get\" command"
default y
depends on TFTP
depends on TFTP || TFTPD
help
Add support for the GET command within the TFTP client. This allows
a client to retrieve a file from a TFTP server.
Also enable upload support in tftpd, if tftpd is selected.
config FEATURE_TFTP_PUT
bool "Enable \"put\" command"
default y
depends on TFTP
depends on TFTP || TFTPD
help
Add support for the PUT command within the TFTP client. This allows
a client to transfer a file to a TFTP server.
Also enable download support in tftpd, if tftpd is selected.
config FEATURE_TFTP_BLOCKSIZE
bool "Enable \"blocksize\" command"
bool "Enable \"blksize\" protocol option"
default n
depends on TFTP
depends on TFTP || TFTPD
help
Allow the client to specify the desired block size for transfers.
Allow tftp to specify block size, and tftpd to understand
"blksize" option.
config DEBUG_TFTP
bool "Enable debug"

1
networking/Kbuild
View File

@ -35,6 +35,7 @@ lib-$(CONFIG_SLATTACH) += slattach.o
lib-$(CONFIG_TELNET) += telnet.o
lib-$(CONFIG_TELNETD) += telnetd.o
lib-$(CONFIG_TFTP) += tftp.o
lib-$(CONFIG_TFTPD) += tftp.o
lib-$(CONFIG_TRACEROUTE) += traceroute.o
lib-$(CONFIG_VCONFIG) += vconfig.o
lib-$(CONFIG_WGET) += wget.o

334
networking/tftp.c
View File

@ -2,7 +2,7 @@
/* -------------------------------------------------------------------------
* tftp.c
*
* A simple tftp client for busybox.
* A simple tftp client/server for busybox.
* Tries to follow RFC1350.
* Only "octet" mode supported.
* Optional blocksize negotiation (RFC2347 + RFC2348)
@ -16,6 +16,8 @@
*
* utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de>
*
* tftpd added by Denys Vlasenko
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
* ------------------------------------------------------------------------- */
@ -46,7 +48,7 @@
#define CMD_PUT(cmd) 1
#else
#define USE_GETPUT(...) __VA_ARGS__
/* masks coming from getpot32 */
/* masks coming from getopt32 */
#define CMD_GET(cmd) ((cmd) & 1)
#define CMD_PUT(cmd) ((cmd) & 2)
#endif
@ -64,14 +66,12 @@ static int tftp_blocksize_check(int blocksize, int bufsize)
* but our implementation makes it impossible
* to use blocksizes smaller than 22 octets.
*/
if ((bufsize && (blocksize > bufsize))
|| (blocksize < 8) || (blocksize > 65564)
|| (blocksize < 24) || (blocksize > 65564)
) {
bb_error_msg("bad blocksize");
return 0;
}
return blocksize;
}
@ -81,8 +81,11 @@ static char *tftp_option_get(char *buf, int len, const char *option)
int opt_found = 0;
int k;
/* buf points to:
* "opt_name<NUL>opt_val<NUL>opt_name2<NUL>opt_val2<NUL>..." */
while (len > 0) {
/* Make sure the options are terminated correctly */
/* Make sure options are terminated correctly */
for (k = 0; k < len; k++) {
if (buf[k] == '\0') {
goto nul_found;
@ -90,7 +93,7 @@ static char *tftp_option_get(char *buf, int len, const char *option)
}
return NULL;
nul_found:
if (opt_val == 0) {
if (opt_val == 0) { /* it's "name" part */
if (strcasecmp(buf, option) == 0) {
opt_found = 1;
}
@ -109,77 +112,116 @@ static char *tftp_option_get(char *buf, int len, const char *option)
#endif
static int tftp( USE_GETPUT(const int cmd,)
static int tftp_protocol(
USE_GETPUT(int cmd,)
len_and_sockaddr *our_lsa,
len_and_sockaddr *peer_lsa,
const char *remotefile, const int localfd,
unsigned port, int tftp_bufsize)
USE_TFTP(const char *remote_file,)
int local_fd,
int blocksize)
{
#if !ENABLE_TFTP
#define remote_file NULL
#endif
struct pollfd pfd[1];
#define socketfd (pfd[0].fd)
#define socket_fd (pfd[0].fd)
int len;
int send_len;
USE_FEATURE_TFTP_BLOCKSIZE(smallint want_option_ack = 0;)
smallint finished = 0;
uint16_t opcode;
uint16_t block_nr = 1;
uint16_t block_nr;
uint16_t recv_blk;
int retries, waittime_ms;
int tftp_bufsize = blocksize + 4;
char *cp;
unsigned org_port;
len_and_sockaddr *const from = alloca(LSA_LEN_SIZE + peer_lsa->len);
/* Can't use RESERVE_CONFIG_BUFFER here since the allocation
* size varies meaning BUFFERS_GO_ON_STACK would fail */
/* We must keep the transmit and receive buffers seperate */
/* In case we rcv a garbage pkt and we need to rexmit the last pkt */
char *xbuf = xmalloc(tftp_bufsize += 4);
char *xbuf = xmalloc(tftp_bufsize);
char *rbuf = xmalloc(tftp_bufsize);
port = org_port = htons(port);
socket_fd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0);
setsockopt_reuseaddr(socket_fd);
socketfd = xsocket(peer_lsa->u.sa.sa_family, SOCK_DGRAM, 0);
if (!ENABLE_TFTP || our_lsa) {
/* tftpd */
block_nr = 0;
/* build opcode */
opcode = TFTP_WRQ;
if (CMD_GET(cmd)) {
opcode = TFTP_RRQ;
}
cp = xbuf + 2;
/* add filename and mode */
/* fill in packet if the filename fits into xbuf */
len = strlen(remotefile) + 1;
if (2 + len + sizeof("octet") >= tftp_bufsize) {
bb_error_msg("remote filename is too long");
goto ret;
}
strcpy(cp, remotefile);
cp += len;
/* add "mode" part of the package */
strcpy(cp, "octet");
cp += sizeof("octet");
/* Create a socket which is:
* 1. bound to IP:port peer sent 1st datagram to,
* 2. connected to peer's IP:port
* This way we will answer from the IP:port peer
* expects, will not get any other packets on
* the socket, and also plain read/write will work. */
xbind(socket_fd, &our_lsa->u.sa, our_lsa->len);
xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
len = tftp_bufsize - 4; /* data block size */
if (len != TFTP_BLOCKSIZE_DEFAULT) {
/* rfc2348 says that 65464 is a max allowed value */
if ((&xbuf[tftp_bufsize - 1] - cp) < sizeof("blksize NNNNN")) {
if (blocksize != TFTP_BLOCKSIZE_DEFAULT) {
/* Create and send OACK packet */
opcode = TFTP_OACK;
cp = xbuf + 2;
goto add_blksize_opt;
}
/* else: just fall into while (1) loop below */
#endif
} else {
/* tftp */
block_nr = 1;
/* We can't (and don't really need to) bind the socket:
* we don't know from which local IP datagrams will be sent,
* but kernel will pick the same IP every time (unless routing
* table is changed), thus peer will see dgrams consistently
* coming from the same IP.
* We would like to connect the socket, but since peer's
* UDP code can be less perfect than ours, _peer's_ IP:port
* in replies may differ from IP:port we used to send
* our first packet. We can connect() only when we get
* first reply. */
/* build opcode */
opcode = TFTP_WRQ;
if (CMD_GET(cmd)) {
opcode = TFTP_RRQ;
}
cp = xbuf + 2;
/* add filename and mode */
/* fill in packet if the filename fits into xbuf */
len = strlen(remote_file) + 1;
if (2 + len + sizeof("octet") >= tftp_bufsize) {
bb_error_msg("remote filename is too long");
goto ret;
}
/* add "blksize", <nul>, blocksize */
strcpy(cp, "blksize");
cp += sizeof("blksize");
cp += snprintf(cp, 6, "%d", len) + 1;
want_option_ack = 1;
}
strcpy(cp, remote_file);
cp += len;
/* add "mode" part of the package */
strcpy(cp, "octet");
cp += sizeof("octet");
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
if (blocksize != TFTP_BLOCKSIZE_DEFAULT) {
/* rfc2348 says that 65464 is a max allowed value */
if ((&xbuf[tftp_bufsize - 1] - cp) < sizeof("blksize NNNNN")) {
bb_error_msg("remote filename is too long");
goto ret;
}
want_option_ack = 1;
add_blksize_opt:
/* add "blksize", <nul>, blocksize, <nul> */
strcpy(cp, "blksize");
cp += sizeof("blksize");
cp += snprintf(cp, 6, "%d", blocksize) + 1;
}
#endif
/* First packet is built, so skip packet generation */
goto send_pkt;
/* First packet is built, so skip packet generation */
goto send_pkt;
}
/* Using mostly goto's - continue/break will be less clear
* in where we actually jump to */
while (1) {
/* Build ACK or DATA */
cp = xbuf + 2;
@ -189,7 +231,7 @@ static int tftp( USE_GETPUT(const int cmd,)
opcode = TFTP_ACK;
if (CMD_PUT(cmd)) {
opcode = TFTP_DATA;
len = full_read(localfd, cp, tftp_bufsize - 4);
len = full_read(local_fd, cp, tftp_bufsize - 4);
if (len < 0) {
bb_perror_msg(bb_msg_read_error);
goto ret;
@ -216,36 +258,36 @@ static int tftp( USE_GETPUT(const int cmd,)
fprintf(stderr, "%02x ", (unsigned char) *cp);
fprintf(stderr, "\n");
#endif
xsendto(socketfd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
xsendto(socket_fd, xbuf, send_len, &peer_lsa->u.sa, peer_lsa->len);
/* Was it final ACK? then exit */
if (finished && (opcode == TFTP_ACK))
goto ret;
recv_again:
/* Receive packet */
/*pfd[0].fd = socketfd;*/
/*pfd[0].fd = socket_fd;*/
pfd[0].events = POLLIN;
switch (safe_poll(pfd, 1, waittime_ms)) {
unsigned from_port;
case 1:
from->len = peer_lsa->len;
memset(&from->u.sa, 0, peer_lsa->len);
len = recvfrom(socketfd, rbuf, tftp_bufsize, 0,
&from->u.sa, &from->len);
if (!our_lsa) {
/* tftp (not tftpd!) receiving 1st packet */
our_lsa = ((void*)(ptrdiff_t)-1); /* not NULL */
len = recvfrom(socket_fd, rbuf, tftp_bufsize, 0,
&peer_lsa->u.sa, &peer_lsa->len);
/* Our first dgram went to port 69
* but reply may come from different one.
* Remember and use this new port (and IP) */
if (len >= 0)
xconnect(socket_fd, &peer_lsa->u.sa, peer_lsa->len);
} else {
/* tftpd, or not the very first packet:
* socket is connect()ed, can just read from it. */
len = safe_read(socket_fd, rbuf, tftp_bufsize);
}
if (len < 0) {
bb_perror_msg("recvfrom");
bb_perror_msg("read");
goto ret;
}
from_port = get_nport(&from->u.sa);
if (port == org_port) {
/* Our first query went to port 69
* but reply will come from different one.
* Remember and use this new port */
port = from_port;
set_nport(peer_lsa, from_port);
}
if (port != from_port)
goto recv_again;
goto process_pkt;
case 0:
retries--;
@ -316,7 +358,7 @@ static int tftp( USE_GETPUT(const int cmd,)
/*static const uint16_t error_8[2] = { htons(TFTP_ERROR), htons(8) };*/
/* thus we open-code big-endian layout */
static const uint8_t error_8[4] = { 0,TFTP_ERROR, 0,8 };
xsendto(socketfd, error_8, 4, &peer_lsa->u.sa, peer_lsa->len);
xsendto(socket_fd, error_8, 4, &peer_lsa->u.sa, peer_lsa->len);
bb_error_msg("server proposes bad blksize %d, exiting", blksize);
goto ret;
}
@ -345,7 +387,7 @@ static int tftp( USE_GETPUT(const int cmd,)
if (CMD_GET(cmd) && (opcode == TFTP_DATA)) {
if (recv_blk == block_nr) {
len = full_write(localfd, &rbuf[4], len - 4);
len = full_write(local_fd, &rbuf[4], len - 4);
if (len < 0) {
bb_perror_msg(bb_msg_write_error);
goto ret;
@ -363,7 +405,7 @@ static int tftp( USE_GETPUT(const int cmd,)
}
if (CMD_PUT(cmd) && (opcode == TFTP_ACK)) {
/* did server ACK our last DATA pkt? */
/* did peer ACK our last DATA pkt? */
if (recv_blk == (uint16_t) (block_nr - 1)) {
if (finished)
goto ret;
@ -381,25 +423,27 @@ static int tftp( USE_GETPUT(const int cmd,)
* See:
* http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome
*/
}
} /* end of "while (1)" */
ret:
if (ENABLE_FEATURE_CLEAN_UP) {
close(socketfd);
close(socket_fd);
free(xbuf);
free(rbuf);
}
return finished == 0; /* returns 1 on failure */
}
#if ENABLE_TFTP
int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tftp_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
len_and_sockaddr *peer_lsa;
const char *localfile = NULL;
const char *remotefile = NULL;
const char *local_file = NULL;
const char *remote_file = NULL;
int port;
USE_GETPUT(int cmd;)
int fd = -1;
int local_fd;
int flags = 0;
int result;
int blocksize = TFTP_BLOCKSIZE_DEFAULT;
@ -412,7 +456,7 @@ int tftp_main(int argc ATTRIBUTE_UNUSED, char **argv)
USE_GETPUT(cmd =) getopt32(argv,
USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p")
"l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"),
&localfile, &remotefile
&local_file, &remote_file
USE_FEATURE_TFTP_BLOCKSIZE(, &blocksize));
argv += optind;
@ -425,36 +469,142 @@ int tftp_main(int argc ATTRIBUTE_UNUSED, char **argv)
return EXIT_FAILURE;
#endif
if (!localfile)
localfile = remotefile;
if (!remotefile)
remotefile = localfile;
if (!local_file)
local_file = remote_file;
if (!remote_file)
remote_file = local_file;
/* Error if filename or host is not known */
if (!remotefile || !argv[0])
if (!remote_file || !argv[0])
bb_show_usage();
fd = CMD_GET(cmd) ? STDOUT_FILENO : STDIN_FILENO;
if (!LONE_DASH(localfile)) {
fd = xopen(localfile, flags);
local_fd = CMD_GET(cmd) ? STDOUT_FILENO : STDIN_FILENO;
if (!LONE_DASH(local_file)) {
local_fd = xopen(local_file, flags);
}
port = bb_lookup_port(argv[1], "udp", 69);
peer_lsa = xhost2sockaddr(argv[0], port);
#if ENABLE_DEBUG_TFTP
fprintf(stderr, "using server '%s', remotefile '%s', localfile '%s'\n",
fprintf(stderr, "using server '%s', remote_file '%s', local_file '%s'\n",
xmalloc_sockaddr2dotted(&peer_lsa->u.sa),
remotefile, localfile);
remote_file, local_file);
#endif
result = tftp( USE_GETPUT(cmd,) peer_lsa, remotefile, fd, port, blocksize);
result = tftp_protocol(
USE_GETPUT(cmd,)
NULL /* our_lsa*/,
peer_lsa,
remote_file, local_fd, blocksize);
if (ENABLE_FEATURE_CLEAN_UP)
close(fd);
if (result != EXIT_SUCCESS && !LONE_DASH(localfile) && CMD_GET(cmd)) {
unlink(localfile);
close(local_fd);
if (result != EXIT_SUCCESS && !LONE_DASH(local_file) && CMD_GET(cmd)) {
unlink(local_file);
}
return result;
}
#endif /* ENABLE_TFTP */
#if ENABLE_TFTPD
/* TODO: libbb candidate? */
static len_and_sockaddr *get_sock_lsa(int s)
{
len_and_sockaddr *lsa;
socklen_t len = 0;
if (getsockname(s, NULL, &len) != 0)
return NULL;
lsa = xzalloc(LSA_LEN_SIZE + len);
lsa->len = len;
getsockname(s, &lsa->u.sa, &lsa->len);
return lsa;
}
int tftpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tftpd_main(int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
{
struct stat statbuf;
char block_buf[TFTP_BLOCKSIZE_DEFAULT];
len_and_sockaddr *our_lsa;
len_and_sockaddr *peer_lsa;
char *filename, *mode, *opt_str;
int result, opcode, cmd, req_modebits, open_mode, local_fd, blksize;
our_lsa = get_sock_lsa(STDIN_FILENO);
if (!our_lsa)
bb_perror_msg_and_die("stdin is not a socket");
peer_lsa = xzalloc(LSA_LEN_SIZE + our_lsa->len);
peer_lsa->len = our_lsa->len;
if (argv[1])
xchdir(argv[1]);
result = recv_from_to(STDIN_FILENO, block_buf, sizeof(block_buf),
0 /* flags */,
&peer_lsa->u.sa, &our_lsa->u.sa, our_lsa->len);
opcode = ntohs(*(uint16_t*)block_buf);
if (result < 4 || result >= sizeof(block_buf)
|| block_buf[result-1] != '\0'
|| (opcode != TFTP_RRQ && opcode != TFTP_WRQ)
) {
bb_error_msg_and_die("malformed packet");
}
filename = block_buf + 2;
if (filename[0] == '.' || strstr(filename, "/.")) {
bb_error_msg_and_die("dot in filename");
}
mode = filename + strlen(filename) + 1;
if (mode >= block_buf + sizeof(block_buf)
|| strcmp(mode, "octet") != 0
) {
bb_error_msg_and_die("malformed packet");
}
blksize = TFTP_BLOCKSIZE_DEFAULT;
#if ENABLE_FEATURE_TFTP_BLOCKSIZE
opt_str = mode + 6;
if (opt_str < block_buf + sizeof(block_buf)) {
char *res = tftp_option_get(opt_str, block_buf + sizeof(block_buf) - opt_str, "blksize");
if (res) {
int sz = xatoi_u(res);
if (tftp_blocksize_check(sz, 0))
blksize = sz;
}
}
#endif
xstat(filename, &statbuf);
/* if opcode == TFTP_WRQ: */
cmd = 1; /* CMD_GET: we will receive file's data */
req_modebits = 0222; /* writable by anyone */
open_mode = O_WRONLY | O_TRUNC;
if (opcode == TFTP_RRQ) {
cmd = 2; /* CMD_PUT */
req_modebits = 0444; /* readable by anyone */
open_mode = O_RDONLY;
}
if (!S_ISREG(statbuf.st_mode)
|| (statbuf.st_mode & req_modebits) != req_modebits
) {
bb_error_msg_and_die("access to '%s' is denied", filename);
}
local_fd = xopen(filename, open_mode);
close(STDIN_FILENO); /* close old, possibly wildcard socket */
/* tftp_protocol() will create new one, bound to particular local IP */
result = tftp_protocol(
USE_GETPUT(cmd,)
our_lsa, peer_lsa,
USE_TFTP(NULL /*remote_file*/,)
local_fd,
blksize
);
return result;
}
#endif /* ENABLE_TFTPD */
#endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */

2
printutils/Config.in
View File

@ -1,4 +1,4 @@
menu "print support"
menu "Print Utilities"
config LPD
bool "lpd"