-/* ------------------------------------------------------------------------- */
-/* tftp.c */
-/* */
-/* A simple tftp client for busybox. */
-/* Tries to follow RFC1350. */
-/* Only "octet" mode and 512-byte data blocks are supported. */
-/* */
-/* 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 "busybox.h"
-//#define BB_FEATURE_TFTP_DEBUG
+//#define CONFIG_FEATURE_TFTP_DEBUG
-static const char *tftp_error_msg[] = {
+#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
+#define TFTP_TIMEOUT 5 /* seconds */
+
+/* opcodes we support */
+
+#define TFTP_RRQ 1
+#define TFTP_WRQ 2
+#define TFTP_DATA 3
+#define TFTP_ACK 4
+#define TFTP_ERROR 5
+#define TFTP_OACK 6
+
+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;
+#ifdef CONFIG_FEATURE_TFTP_GET
+# define tftp_cmd_get 1
+#else
+# define tftp_cmd_get 0
+#endif
+#ifdef CONFIG_FEATURE_TFTP_PUT
+# define tftp_cmd_put (tftp_cmd_get+1)
+#else
+# define tftp_cmd_put 0
+#endif
+
+
+#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+
+static int tftp_blocksize_check(int blocksize, int bufsize)
+{
+ /* 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)) {
+ bb_error_msg("bad blocksize");
+ return 0;
+ }
+
+ return blocksize;
+}
+
+static char *tftp_option_get(char *buf, int len, char *option)
+{
+ int opt_val = 0;
+ int opt_found = 0;
+ int k;
+
+ while (len > 0) {
+
+ /* Make sure the options are terminated correctly */
+
+ for (k = 0; k < len; k++) {
+ if (buf[k] == '\0') {
+ break;
+ }
+ }
+
+ if (k >= len) {
+ break;
+ }
+
+ if (opt_val == 0) {
+ if (strcasecmp(buf, option) == 0) {
+ opt_found = 1;
+ }
+ }
+ 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 *serverfile, int localfd, const int port, int tftp_bufsize)
+ const char *remotefile, 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;
int opcode = 0;
int finished = 0;
int timeout = bb_tftp_num_retries;
- int block_nr = 1;
- RESERVE_BB_BUFFER(buf, tftp_bufsize + 4); // Why 4 ?
+ unsigned short block_nr = 1;
+
+#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+ int want_option_ack = 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);
tftp_bufsize += 4;
- if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
- perror_msg("socket");
+ if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { /* bb_xsocket? */
+ bb_perror_msg("socket");
return EXIT_FAILURE;
}
bind(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) {
- opcode = 1; // read request = 1
+ opcode = TFTP_RRQ;
}
if (cmd_put) {
- opcode = 2; // write request = 2
+ opcode = TFTP_WRQ;
}
while (1) {
-
- /* build packet of type "opcode" */
-
-
cp = buf;
+ /* first create the opcode part */
+
*((unsigned short *) cp) = htons(opcode);
cp += 2;
/* add filename and mode */
- if ((cmd_get && (opcode == 1)) || // read request = 1
- (cmd_put && (opcode == 2))) { // write request = 2
+ if ((cmd_get && (opcode == TFTP_RRQ)) ||
+ (cmd_put && (opcode == TFTP_WRQ))) {
+ int too_long = 0;
- /* what is this trying to do ? */
- while (cp != &buf[tftp_bufsize - 1]) {
- if ((*cp = *serverfile++) == '\0')
- break;
- cp++;
+ /* 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);
+ cp += len;
}
- /* and this ? */
- if ((*cp != '\0') || (&buf[tftp_bufsize - 1] - cp) < 7) {
- error_msg("too long server-filename");
+
+ if (too_long || ((&buf[tftp_bufsize - 1] - cp) < 6)) {
+ bb_error_msg("too long remote-filename");
break;
}
- memcpy(cp + 1, "octet", 6);
- cp += 7;
+ /* add "mode" part of the package */
+
+ memcpy(cp, "octet", 6);
+ cp += 6;
+
+#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+
+ len = tftp_bufsize - 4; /* data block size */
+
+ if (len != TFTP_BLOCKSIZE_DEFAULT) {
+
+ if ((&buf[tftp_bufsize - 1] - cp) < 15) {
+ bb_error_msg("too long remote-filename");
+ break;
+ }
+
+ /* add "blksize" + number of blocks */
+
+ memcpy(cp, "blksize", 8);
+ cp += 8;
+
+ cp += snprintf(cp, 6, "%d", len) + 1;
+
+ want_option_ack = 1;
+ }
+#endif
}
/* add ack and data */
- if ((cmd_get && (opcode == 4)) || // acknowledgement = 4
- (cmd_put && (opcode == 3))) { // data packet == 3
+ if ((cmd_get && (opcode == TFTP_ACK)) ||
+ (cmd_put && (opcode == TFTP_DATA))) {
*((unsigned short *) cp) = htons(block_nr);
block_nr++;
- if (cmd_put && (opcode == 3)) { // data packet == 3
- len = read(localfd, cp, tftp_bufsize - 4);
+ if (cmd_put && (opcode == TFTP_DATA)) {
+ len = bb_full_read(localfd, cp, tftp_bufsize - 4);
if (len < 0) {
- perror_msg("read");
+ bb_perror_msg("read");
break;
}
}
cp += len;
- } else if (finished) {
- break;
}
}
/* send packet */
+ timeout = bb_tftp_num_retries; /* re-initialize */
do {
len = cp - buf;
-#ifdef BB_FEATURE_TFTP_DEBUG
- printf("sending %u bytes\n", len);
+#ifdef CONFIG_FEATURE_TFTP_DEBUG
+ 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");
+ 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);
- tv.tv_sec = 5; // BB_TFPT_TIMEOUT = 5
+ tv.tv_sec = TFTP_TIMEOUT;
tv.tv_usec = 0;
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);
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) {
timeout = bb_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;
}
opcode = ntohs(*((unsigned short *) buf));
tmp = ntohs(*((unsigned short *) &buf[2]));
-#ifdef BB_FEATURE_TFTP_DEBUG
- printf("received %d bytes: %04x %04x\n", len, opcode, tmp);
+#ifdef CONFIG_FEATURE_TFTP_DEBUG
+ fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, tmp);
#endif
- if (cmd_get && (opcode == 3)) { // data packet == 3
+ if (opcode == TFTP_ERROR) {
+ const char *msg = NULL;
+
+ if (buf[4] != '\0') {
+ msg = &buf[4];
+ buf[tftp_bufsize - 1] = '\0';
+ } else if (tmp < (sizeof(tftp_bb_error_msg)
+ / sizeof(char *))) {
+
+ msg = tftp_bb_error_msg[tmp];
+ }
+
+ if (msg) {
+ bb_error_msg("server says: %s", msg);
+ }
+
+ break;
+ }
+
+#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+ if (want_option_ack) {
+
+ want_option_ack = 0;
+
+ if (opcode == TFTP_OACK) {
+
+ /* server seems to support options */
+
+ char *res;
+
+ res = tftp_option_get(&buf[2], len-2,
+ "blksize");
+
+ if (res) {
+ int blksize = atoi(res);
+
+ if (tftp_blocksize_check(blksize,
+ tftp_bufsize - 4)) {
+
+ if (cmd_put) {
+ opcode = TFTP_DATA;
+ }
+ else {
+ opcode = TFTP_ACK;
+ }
+#ifdef CONFIG_FEATURE_TFTP_DEBUG
+ fprintf(stderr, "using blksize %u\n", blksize);
+#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;
+ }
+#endif
+
+ if (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("write");
break;
}
finished++;
}
- opcode = 4; // acknowledgement = 4
+ 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 == 4)) { // acknowledgement = 4
+ if (cmd_put && (opcode == TFTP_ACK)) {
- if (tmp == (block_nr - 1)) {
+ if (tmp == (unsigned short)(block_nr - 1)) {
if (finished) {
break;
}
- opcode = 3; // data packet == 3
+ opcode = TFTP_DATA;
continue;
}
}
-
- if (opcode == 5) { // error code == 5
- char *msg = NULL;
-
- if (buf[4] != '\0') {
- msg = &buf[4];
- buf[tftp_bufsize - 1] = '\0';
- } else if (tmp < (sizeof(tftp_error_msg) / sizeof(char *))) {
- msg = (char *) tftp_error_msg[tmp];
- }
-
- if (msg) {
- error_msg("server says: %s", msg);
- }
-
- break;
- }
}
+#ifdef CONFIG_FEATURE_CLEAN_UP
close(socketfd);
+ 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 = 512;
+ int blocksize = TFTP_BLOCKSIZE_DEFAULT;
- while ((opt = getopt(argc, argv, "b:gpl:r:")) != -1) {
- switch (opt) {
- case 'b':
- blocksize = atoi(optarg);
- break;
-#ifdef BB_FEATURE_TFTP_GET
- case 'g':
- cmd = tftp_cmd_get;
- flags = O_WRONLY | O_CREAT;
- break;
+ /* 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 BB_FEATURE_TFTP_PUT
- case 'p':
- cmd = tftp_cmd_put;
- flags = O_RDONLY;
- break;
+
+#ifdef CONFIG_FEATURE_TFTP_GET
+#define GET "g"
+#define GET_COMPL ":g"
+#else
+#define GET
+#define GET_COMPL
#endif
- case 'l':
- localfile = xstrdup(optarg);
- break;
- case 'r':
- remotefile = xstrdup(optarg);
- break;
+
+#ifdef CONFIG_FEATURE_TFTP_PUT
+#define PUT "p"
+#define PUT_COMPL ":p"
+#else
+#define PUT
+#define PUT_COMPL
+#endif
+
+#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;
+#else
+ /* XXX: may be should #error ? */
+#endif
+
+
+ cmd = bb_getopt_ulflags(argc, argv, GET PUT "l:r:" BS,
+ &localfile, &remotefile BS_ARG);
+#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();
- }
+ cmd &= (tftp_cmd_get | tftp_cmd_put);
+#ifdef CONFIG_FEATURE_TFTP_GET
+ if(cmd == tftp_cmd_get)
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
+#endif
+#ifdef CONFIG_FEATURE_TFTP_PUT
+ if(cmd == tftp_cmd_put)
+ flags = O_RDONLY;
+#endif
- fd = open(localfile, flags, 0644);
+ if(localfile == NULL)
+ localfile = remotefile;
+ if(remotefile == NULL)
+ remotefile = localfile;
+ /* XXX: I corrected this, but may be wrong too. vodz */
+ if(localfile==NULL || strcmp(localfile, "-") == 0) {
+ fd = fileno((cmd==tftp_cmd_get)? stdout : stdin);
+ } else if (fd==-1) {
+ fd = open(localfile, flags, 0644);
+ }
if (fd < 0) {
- perror_msg_and_die("local file");
+ bb_perror_msg_and_die("local file");
}
+ /* XXX: argv[optind] and/or argv[optind + 1] may be NULL! */
host = xgethostbyname(argv[optind]);
+ port = bb_lookup_port(argv[optind + 1], "udp", 69);
- if (optind + 2 == argc) {
- port = atoi(argv[optind + 1]);
- }
-
-#ifdef BB_FEATURE_TFTP_DEBUG
- printf("using server \"%s\", serverfile \"%s\","
+#ifdef CONFIG_FEATURE_TFTP_DEBUG
+ 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);
- close(fd);
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ if (!(fd == STDOUT_FILENO || fd == STDIN_FILENO)) {
+ close(fd);
+ }
+#endif
return(result);
-}
\ No newline at end of file
+}
projects / oweals / busybox.git / blobdiff