-/* ------------------------------------------------------------------------- */
-/* tftp.c */
-/* */
-/* A simple tftp client for busybox. */
-/* Tries to follow RFC1350. */
-/* Only "octet" mode supported. */
-/* Optional blocksize negotiation (RFC2347 + RFC2348) */
-/* */
-/* Copyright (C) 2001 Magnus Damm <damm@opensource.se> */
-/* */
-/* Parts of the code based on: */
-/* */
-/* atftp: Copyright (C) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca> */
-/* and Remi Lefebvre <remi@debian.org> */
-/* */
-/* utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de> */
-/* */
-/* This program is free software; you can redistribute it and/or modify */
-/* it under the terms of the GNU General Public License as published by */
-/* the Free Software Foundation; either version 2 of the License, or */
-/* (at your option) any later version. */
-/* */
-/* This program is distributed in the hope that it will be useful, */
-/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
-/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
-/* General Public License for more details. */
-/* */
-/* You should have received a copy of the GNU General Public License */
-/* along with this program; if not, write to the Free Software */
-/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
-/* */
-/* ------------------------------------------------------------------------- */
+/* vi: set sw=4 ts=4: */
+/* -------------------------------------------------------------------------
+ * tftp.c
+ *
+ * A simple tftp client for busybox.
+ * Tries to follow RFC1350.
+ * Only "octet" mode supported.
+ * Optional blocksize negotiation (RFC2347 + RFC2348)
+ *
+ * Copyright (C) 2001 Magnus Damm <damm@opensource.se>
+ *
+ * Parts of the code based on:
+ *
+ * atftp: Copyright (C) 2000 Jean-Pierre Lefebvre <helix@step.polymtl.ca>
+ * and Remi Lefebvre <remi@debian.org>
+ *
+ * utftp: Copyright (C) 1999 Uwe Ohse <uwe@ohse.de>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * ------------------------------------------------------------------------- */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
-#include <sys/time.h>
#include <sys/stat.h>
#include <netdb.h>
#include <netinet/in.h>
#include "busybox.h"
-//#define CONFIG_FEATURE_TFTP_DEBUG
-#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
-#define TFTP_TIMEOUT 5 /* seconds */
+#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
+#define TFTP_TIMEOUT 5 /* seconds */
+#define TFTP_NUM_RETRIES 5 /* number of retries */
-/* opcodes we support */
+static const char * const MODE_OCTET = "octet";
+#define MODE_OCTET_LEN 6 /* sizeof(MODE_OCTET)*/
+
+static const char * const OPTION_BLOCKSIZE = "blksize";
+#define OPTION_BLOCKSIZE_LEN 8 /* sizeof(OPTION_BLOCKSIZE) */
+/* opcodes we support */
#define TFTP_RRQ 1
#define TFTP_WRQ 2
#define TFTP_DATA 3
#define TFTP_ERROR 5
#define TFTP_OACK 6
-static const char *tftp_error_msg[] = {
+static const char *const tftp_bb_error_msg[] = {
"Undefined error",
"File not found",
"Access violation",
"No such user"
};
-const int tftp_cmd_get = 1;
-const int tftp_cmd_put = 2;
+#define tftp_cmd_get ENABLE_FEATURE_TFTP_GET
+
+#if ENABLE_FEATURE_TFTP_PUT
+# define tftp_cmd_put (tftp_cmd_get+ENABLE_FEATURE_TFTP_PUT)
+#else
+# define tftp_cmd_put 0
+#endif
+
#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
-static int tftp_blocksize_check(int blocksize, int bufsize)
+static int tftp_blocksize_check(int blocksize, int bufsize)
{
- /* Check if the blocksize is valid:
+ /* Check if the blocksize is valid:
* RFC2348 says between 8 and 65464,
* but our implementation makes it impossible
* to use blocksizes smaller than 22 octets.
*/
- if ((bufsize && (blocksize > bufsize)) ||
- (blocksize < 8) || (blocksize > 65464)) {
- error_msg("bad blocksize");
- return 0;
+ if ((bufsize && (blocksize > bufsize)) ||
+ (blocksize < 8) || (blocksize > 65564)) {
+ bb_error_msg("bad blocksize");
+ return 0;
}
return blocksize;
}
-static char *tftp_option_get(char *buf, int len, char *option)
+static char *tftp_option_get(char *buf, int len, const char * const option)
{
- int opt_val = 0;
+ int opt_val = 0;
int opt_found = 0;
int k;
-
+
while (len > 0) {
- /* Make sure the options are terminated correctly */
+ /* Make sure the options are terminated correctly */
- for (k = 0; k < len; k++) {
- if (buf[k] == '\0') {
- break;
+ for (k = 0; k < len; k++) {
+ if (buf[k] == '\0') {
+ break;
}
}
if (k >= len) {
- break;
+ break;
}
if (opt_val == 0) {
if (strcasecmp(buf, option) == 0) {
- opt_found = 1;
+ opt_found = 1;
}
- }
- else {
- if (opt_found) {
+ } else {
+ if (opt_found) {
return buf;
}
}
-
+
k++;
-
+
buf += k;
len -= k;
-
+
opt_val ^= 1;
}
-
+
return NULL;
}
#endif
-static inline int tftp(const int cmd, const struct hostent *host,
- const char *remotefile, int localfd, const int port, int tftp_bufsize)
+static int tftp(const int cmd, const struct hostent *host,
+ const char *remotefile, const int localfd,
+ const unsigned short port, int tftp_bufsize)
{
- const int cmd_get = cmd & tftp_cmd_get;
- const int cmd_put = cmd & tftp_cmd_put;
- const int bb_tftp_num_retries = 5;
-
struct sockaddr_in sa;
struct sockaddr_in from;
struct timeval tv;
socklen_t fromlen;
fd_set rfds;
- char *cp;
- unsigned short tmp;
int socketfd;
int len;
int opcode = 0;
int finished = 0;
- int timeout = bb_tftp_num_retries;
- int block_nr = 1;
+ int timeout = TFTP_NUM_RETRIES;
+ unsigned short block_nr = 1;
+ unsigned short tmp;
+ char *cp;
-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
- int want_option_ack = 0;
-#endif
+ USE_FEATURE_TFTP_BLOCKSIZE(int want_option_ack = 0;)
/* 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);
-
- tftp_bufsize += 4;
+ char *buf=xmalloc(tftp_bufsize += 4);
if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
- perror_msg("socket");
+ /* need to unlink the localfile, so don't use bb_xsocket here. */
+ bb_perror_msg("socket");
return EXIT_FAILURE;
}
len = sizeof(sa);
memset(&sa, 0, len);
- bind(socketfd, (struct sockaddr *)&sa, len);
+ bb_xbind(socketfd, (struct sockaddr *)&sa, len);
sa.sin_family = host->h_addrtype;
- sa.sin_port = htons(port);
+ sa.sin_port = port;
memcpy(&sa.sin_addr, (struct in_addr *) host->h_addr,
sizeof(sa.sin_addr));
/* build opcode */
-
- if (cmd_get) {
+ if (cmd & tftp_cmd_get) {
opcode = TFTP_RRQ;
}
-
- if (cmd_put) {
+ if (cmd & tftp_cmd_put) {
opcode = TFTP_WRQ;
}
cp = buf;
/* first create the opcode part */
-
*((unsigned short *) cp) = htons(opcode);
-
cp += 2;
/* add filename and mode */
+ if (((cmd & tftp_cmd_get) && (opcode == TFTP_RRQ)) ||
+ ((cmd & tftp_cmd_put) && (opcode == TFTP_WRQ)))
+ {
+ int too_long = 0;
- if ((cmd_get && (opcode == TFTP_RRQ)) ||
- (cmd_put && (opcode == TFTP_WRQ))) {
- int too_long = 0;
-
- /* see if the filename fits into buf */
- /* and fill in packet */
-
+ /* see if the filename fits into buf
+ * and fill in packet. */
len = strlen(remotefile) + 1;
if ((cp + len) >= &buf[tftp_bufsize - 1]) {
- too_long = 1;
- }
- else {
- safe_strncpy(cp, remotefile, len);
+ too_long = 1;
+ } else {
+ safe_strncpy(cp, remotefile, len);
cp += len;
}
- if (too_long || ((&buf[tftp_bufsize - 1] - cp) < 6)) {
- error_msg("too long remote-filename");
+ if (too_long || ((&buf[tftp_bufsize - 1] - cp) < MODE_OCTET_LEN)) {
+ bb_error_msg("remote filename too long");
break;
}
/* add "mode" part of the package */
-
- memcpy(cp, "octet", 6);
- cp += 6;
+ memcpy(cp, MODE_OCTET, MODE_OCTET_LEN);
+ cp += MODE_OCTET_LEN;
#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
- len = tftp_bufsize - 4; /* data block size */
+ len = tftp_bufsize - 4; /* data block size */
if (len != TFTP_BLOCKSIZE_DEFAULT) {
- if ((&buf[tftp_bufsize - 1] - cp) < 15) {
- error_msg("too long remote-filename");
+ if ((&buf[tftp_bufsize - 1] - cp) < 15) {
+ bb_error_msg("remote filename too long");
break;
}
/* add "blksize" + number of blocks */
-
- memcpy(cp, "blksize", 8);
- cp += 8;
-
+ memcpy(cp, OPTION_BLOCKSIZE, OPTION_BLOCKSIZE_LEN);
+ cp += OPTION_BLOCKSIZE_LEN;
cp += snprintf(cp, 6, "%d", len) + 1;
want_option_ack = 1;
/* add ack and data */
- if ((cmd_get && (opcode == TFTP_ACK)) ||
- (cmd_put && (opcode == TFTP_DATA))) {
+ if (((cmd & tftp_cmd_get) && (opcode == TFTP_ACK)) ||
+ ((cmd & tftp_cmd_put) && (opcode == TFTP_DATA))) {
*((unsigned short *) cp) = htons(block_nr);
block_nr++;
- if (cmd_put && (opcode == TFTP_DATA)) {
- len = read(localfd, cp, tftp_bufsize - 4);
+ if ((cmd & tftp_cmd_put) && (opcode == TFTP_DATA)) {
+ len = bb_full_read(localfd, cp, tftp_bufsize - 4);
if (len < 0) {
- perror_msg("read");
+ bb_perror_msg(bb_msg_read_error);
break;
}
}
cp += len;
- } else if (finished) {
- break;
}
}
/* send packet */
+ timeout = TFTP_NUM_RETRIES; /* re-initialize */
do {
len = cp - buf;
-#ifdef CONFIG_FEATURE_TFTP_DEBUG
- printf("sending %u bytes\n", len);
+#ifdef CONFIG_DEBUG_TFTP
+ fprintf(stderr, "sending %u bytes\n", len);
for (cp = buf; cp < &buf[len]; cp++)
- printf("%02x ", *cp);
- printf("\n");
+ fprintf(stderr, "%02x ", (unsigned char) *cp);
+ fprintf(stderr, "\n");
#endif
if (sendto(socketfd, buf, len, 0,
- (struct sockaddr *) &sa, sizeof(sa)) < 0) {
- perror_msg("send");
+ (struct sockaddr *) &sa, sizeof(sa)) < 0) {
+ bb_perror_msg("send");
len = -1;
break;
}
- /* receive packet */
+ if (finished && (opcode == TFTP_ACK)) {
+ break;
+ }
+ /* receive packet */
memset(&from, 0, sizeof(from));
fromlen = sizeof(from);
FD_ZERO(&rfds);
FD_SET(socketfd, &rfds);
- switch (select(FD_SETSIZE, &rfds, NULL, NULL, &tv)) {
+ switch (select(socketfd + 1, &rfds, NULL, NULL, &tv)) {
case 1:
len = recvfrom(socketfd, buf, tftp_bufsize, 0,
- (struct sockaddr *) &from, &fromlen);
+ (struct sockaddr *) &from, &fromlen);
if (len < 0) {
- perror_msg("recvfrom");
+ bb_perror_msg("recvfrom");
break;
}
timeout = 0;
- if (sa.sin_port == htons(port)) {
+ if (sa.sin_port == port) {
sa.sin_port = from.sin_port;
}
if (sa.sin_port == from.sin_port) {
/* fall-through for bad packets! */
/* discard the packet - treat as timeout */
- timeout = bb_tftp_num_retries;
-
+ timeout = TFTP_NUM_RETRIES;
case 0:
- error_msg("timeout");
+ bb_error_msg("timeout");
+ timeout--;
if (timeout == 0) {
len = -1;
- error_msg("last timeout");
- } else {
- timeout--;
+ bb_error_msg("last timeout");
}
break;
-
default:
- perror_msg("select");
+ bb_perror_msg("select");
len = -1;
}
} while (timeout && (len >= 0));
- if (len < 0) {
+ if ((finished) || (len < 0)) {
break;
}
/* process received packet */
-
opcode = ntohs(*((unsigned short *) buf));
tmp = ntohs(*((unsigned short *) &buf[2]));
-#ifdef CONFIG_FEATURE_TFTP_DEBUG
- printf("received %d bytes: %04x %04x\n", len, opcode, tmp);
+#ifdef CONFIG_DEBUG_TFTP
+ fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, tmp);
#endif
if (opcode == TFTP_ERROR) {
- char *msg = NULL;
+ const char *msg = NULL;
if (buf[4] != '\0') {
msg = &buf[4];
buf[tftp_bufsize - 1] = '\0';
- } else if (tmp < (sizeof(tftp_error_msg)
- / sizeof(char *))) {
+ } else if (tmp < (sizeof(tftp_bb_error_msg)
+ / sizeof(char *))) {
- msg = (char *) tftp_error_msg[tmp];
+ msg = tftp_bb_error_msg[tmp];
}
if (msg) {
- error_msg("server says: %s", msg);
+ bb_error_msg("server says: %s", msg);
}
break;
}
-
#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
if (want_option_ack) {
- want_option_ack = 0;
+ want_option_ack = 0;
+
+ if (opcode == TFTP_OACK) {
- if (opcode == TFTP_OACK) {
+ /* server seems to support options */
- /* server seems to support options */
+ char *res;
- char *res;
+ res = tftp_option_get(&buf[2], len - 2, OPTION_BLOCKSIZE);
- res = tftp_option_get(&buf[2], len-2,
- "blksize");
+ if (res) {
+ int blksize = atoi(res);
- if (res) {
- int foo = atoi(res);
-
- if (tftp_blocksize_check(foo,
- tftp_bufsize - 4)) {
+ if (tftp_blocksize_check(blksize, tftp_bufsize - 4)) {
- if (cmd_put) {
- opcode = TFTP_DATA;
- }
- else {
- opcode = TFTP_ACK;
- }
-#ifdef CONFIG_FEATURE_TFTP_DEBUG
- printf("using blksize %u\n");
+ if (cmd & tftp_cmd_put) {
+ opcode = TFTP_DATA;
+ } else {
+ opcode = TFTP_ACK;
+ }
+#ifdef CONFIG_DEBUG_TFTP
+ fprintf(stderr, "using %s %u\n", OPTION_BLOCKSIZE,
+ blksize);
#endif
- tftp_bufsize = foo + 4;
- block_nr = 0;
- continue;
- }
- }
- /* FIXME:
- * we should send ERROR 8 */
- error_msg("bad server option");
- break;
- }
-
- error_msg("warning: blksize not supported by server"
- " - reverting to 512");
-
- tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4;
+ 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;
}
#endif
- if (cmd_get && (opcode == TFTP_DATA)) {
+ if ((cmd & tftp_cmd_get) && (opcode == TFTP_DATA)) {
if (tmp == block_nr) {
-
- len = write(localfd, &buf[4], len - 4);
+
+ len = bb_full_write(localfd, &buf[4], len - 4);
if (len < 0) {
- perror_msg("write");
+ bb_perror_msg(bb_msg_write_error);
break;
}
opcode = TFTP_ACK;
continue;
}
+ /* in case the last ack disappeared into the ether */
+ if (tmp == (block_nr - 1)) {
+ --block_nr;
+ opcode = TFTP_ACK;
+ continue;
+ } else if (tmp + 1 == block_nr) {
+ /* Server lost our TFTP_ACK. Resend it */
+ block_nr = tmp;
+ opcode = TFTP_ACK;
+ continue;
+ }
}
- if (cmd_put && (opcode == TFTP_ACK)) {
+ if ((cmd & tftp_cmd_put) && (opcode == TFTP_ACK)) {
- if (tmp == (block_nr - 1)) {
+ if (tmp == (unsigned short) (block_nr - 1)) {
if (finished) {
break;
}
#ifdef CONFIG_FEATURE_CLEAN_UP
close(socketfd);
-
- RELEASE_CONFIG_BUFFER(buf);
+ free(buf);
#endif
return finished ? EXIT_SUCCESS : EXIT_FAILURE;
int tftp_main(int argc, char **argv)
{
struct hostent *host = NULL;
- char *localfile = NULL;
- char *remotefile = NULL;
- int port = 69;
+ const char *localfile = NULL;
+ const char *remotefile = NULL;
+ int port;
int cmd = 0;
int fd = -1;
int flags = 0;
- int opt;
int result;
int blocksize = TFTP_BLOCKSIZE_DEFAULT;
/* figure out what to pass to getopt */
#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+ char *sblocksize = NULL;
+
#define BS "b:"
+#define BS_ARG , &sblocksize
#else
#define BS
+#define BS_ARG
#endif
#ifdef CONFIG_FEATURE_TFTP_GET
#define GET "g"
+#define GET_COMPL ":g"
#else
-#define GET
+#define GET
+#define GET_COMPL
#endif
#ifdef CONFIG_FEATURE_TFTP_PUT
#define PUT "p"
+#define PUT_COMPL ":p"
#else
-#define PUT
+#define PUT
+#define PUT_COMPL
#endif
- while ((opt = getopt(argc, argv, BS GET PUT "l:r:")) != -1) {
- switch (opt) {
-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
- case 'b':
- blocksize = atoi(optarg);
- if (!tftp_blocksize_check(blocksize, 0)) {
- return EXIT_FAILURE;
- }
- break;
+#if defined(CONFIG_FEATURE_TFTP_GET) && defined(CONFIG_FEATURE_TFTP_PUT)
+ bb_opt_complementally = GET_COMPL PUT_COMPL ":?g--p:p--g";
+#elif defined(CONFIG_FEATURE_TFTP_GET) || defined(CONFIG_FEATURE_TFTP_PUT)
+ bb_opt_complementally = GET_COMPL PUT_COMPL;
#endif
+
+
+ cmd = bb_getopt_ulflags(argc, argv, GET PUT "l:r:" BS,
+ &localfile, &remotefile BS_ARG);
+
+ cmd &= (tftp_cmd_get | tftp_cmd_put);
#ifdef CONFIG_FEATURE_TFTP_GET
- case 'g':
- cmd = tftp_cmd_get;
- flags = O_WRONLY | O_CREAT;
- break;
+ if (cmd == tftp_cmd_get)
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
#endif
#ifdef CONFIG_FEATURE_TFTP_PUT
- case 'p':
- cmd = tftp_cmd_put;
- flags = O_RDONLY;
- break;
+ if (cmd == tftp_cmd_put)
+ flags = O_RDONLY;
#endif
- case 'l':
- localfile = xstrdup(optarg);
- break;
- case 'r':
- remotefile = xstrdup(optarg);
- break;
+
+#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+ if (sblocksize) {
+ blocksize = atoi(sblocksize);
+ if (!tftp_blocksize_check(blocksize, 0)) {
+ return EXIT_FAILURE;
}
}
+#endif
- if ((cmd == 0) || (optind == argc)) {
- show_usage();
- }
- if(cmd == tftp_cmd_get)
- if(localfile == NULL)
+ if (localfile == NULL)
localfile = remotefile;
-
- if(cmd == tftp_cmd_put)
- if(remotefile == NULL)
+ if (remotefile == NULL)
remotefile = localfile;
+ if ((localfile == NULL && remotefile == NULL) || (argv[optind] == NULL))
+ bb_show_usage();
- fd = open(localfile, flags, 0644);
+ if (localfile == NULL || strcmp(localfile, "-") == 0) {
+ fd = (cmd == tftp_cmd_get) ? STDOUT_FILENO : STDIN_FILENO;
+ } else {
+ fd = open(localfile, flags, 0644); /* fail below */
+ }
if (fd < 0) {
- perror_msg_and_die("local file");
+ bb_perror_msg_and_die("local file");
}
host = xgethostbyname(argv[optind]);
+ port = bb_lookup_port(argv[optind + 1], "udp", 69);
- if (optind + 2 == argc) {
- port = atoi(argv[optind + 1]);
- }
-
-#ifdef CONFIG_FEATURE_TFTP_DEBUG
- printf("using server \"%s\", remotefile \"%s\", "
- "localfile \"%s\".\n",
- inet_ntoa(*((struct in_addr *) host->h_addr)),
- remotefile, localfile);
+#ifdef CONFIG_DEBUG_TFTP
+ fprintf(stderr, "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);
-#ifdef CONFIG_FEATURE_CLEAN_UP
- close(fd);
-#endif
- return(result);
+ if (!(fd == STDOUT_FILENO || fd == STDIN_FILENO)) {
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
+ if (cmd == tftp_cmd_get && result != EXIT_SUCCESS)
+ unlink(localfile);
+ }
+ return (result);
}
projects / oweals / busybox.git / blobdiff