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-rw-r--r--busybox/networking/tftp.c584
1 files changed, 584 insertions, 0 deletions
diff --git a/busybox/networking/tftp.c b/busybox/networking/tftp.c
new file mode 100644
index 0000000..3c94731
--- /dev/null
+++ b/busybox/networking/tftp.c
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+/* ------------------------------------------------------------------------- */
+/* 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 */
+/* */
+/* ------------------------------------------------------------------------- */
+
+#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 <arpa/inet.h>
+#include <unistd.h>
+#include <fcntl.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 */
+
+/* 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 *tftp_bb_error_msg[] = {
+ "Undefined error",
+ "File not found",
+ "Access violation",
+ "Disk full or allocation error",
+ "Illegal TFTP operation",
+ "Unknown transfer ID",
+ "File already exists",
+ "No such user"
+};
+
+const int tftp_cmd_get = 1;
+const int tftp_cmd_put = 2;
+
+#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 *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;
+ 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;
+ 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) {
+ bb_perror_msg("socket");
+ return EXIT_FAILURE;
+ }
+
+ len = sizeof(sa);
+
+ memset(&sa, 0, len);
+ bind(socketfd, (struct sockaddr *)&sa, len);
+
+ sa.sin_family = host->h_addrtype;
+ sa.sin_port = port;
+ memcpy(&sa.sin_addr, (struct in_addr *) host->h_addr,
+ sizeof(sa.sin_addr));
+
+ /* build opcode */
+
+ if (cmd_get) {
+ opcode = TFTP_RRQ;
+ }
+
+ if (cmd_put) {
+ opcode = TFTP_WRQ;
+ }
+
+ while (1) {
+
+ cp = buf;
+
+ /* first create the opcode part */
+
+ *((unsigned short *) cp) = htons(opcode);
+
+ cp += 2;
+
+ /* add filename and mode */
+
+ 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 */
+
+ len = strlen(remotefile) + 1;
+
+ if ((cp + len) >= &buf[tftp_bufsize - 1]) {
+ too_long = 1;
+ }
+ else {
+ safe_strncpy(cp, remotefile, len);
+ cp += len;
+ }
+
+ if (too_long || ((&buf[tftp_bufsize - 1] - cp) < 6)) {
+ bb_error_msg("too long remote-filename");
+ break;
+ }
+
+ /* 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 == TFTP_ACK)) ||
+ (cmd_put && (opcode == TFTP_DATA))) {
+
+ *((unsigned short *) cp) = htons(block_nr);
+
+ cp += 2;
+
+ block_nr++;
+
+ if (cmd_put && (opcode == TFTP_DATA)) {
+ len = bb_full_read(localfd, cp, tftp_bufsize - 4);
+
+ if (len < 0) {
+ bb_perror_msg("read");
+ break;
+ }
+
+ if (len != (tftp_bufsize - 4)) {
+ finished++;
+ }
+
+ cp += len;
+ }
+ }
+
+
+ /* send packet */
+
+
+ timeout = bb_tftp_num_retries; /* re-initialize */
+ do {
+
+ 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;
+ }
+
+
+ if (finished && (opcode == TFTP_ACK)) {
+ break;
+ }
+
+ /* receive packet */
+
+ memset(&from, 0, sizeof(from));
+ fromlen = sizeof(from);
+
+ tv.tv_sec = TFTP_TIMEOUT;
+ tv.tv_usec = 0;
+
+ FD_ZERO(&rfds);
+ FD_SET(socketfd, &rfds);
+
+ 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;
+ }
+
+ timeout = 0;
+
+ if (sa.sin_port == port) {
+ sa.sin_port = from.sin_port;
+ }
+ if (sa.sin_port == from.sin_port) {
+ break;
+ }
+
+ /* fall-through for bad packets! */
+ /* discard the packet - treat as timeout */
+ timeout = bb_tftp_num_retries;
+
+ case 0:
+ bb_error_msg("timeout");
+
+ timeout--;
+ if (timeout == 0) {
+ len = -1;
+ bb_error_msg("last timeout");
+ }
+ break;
+
+ default:
+ bb_perror_msg("select");
+ len = -1;
+ }
+
+ } while (timeout && (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
+ fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, tmp);
+#endif
+
+ if (opcode == TFTP_ERROR) {
+ 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 = (char *) 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 = bb_full_write(localfd, &buf[4], len - 4);
+
+ if (len < 0) {
+ bb_perror_msg("write");
+ break;
+ }
+
+ if (len != (tftp_bufsize - 4)) {
+ finished++;
+ }
+
+ opcode = TFTP_ACK;
+ continue;
+ }
+ }
+
+ if (cmd_put && (opcode == TFTP_ACK)) {
+
+ if (tmp == (unsigned short)(block_nr - 1)) {
+ if (finished) {
+ break;
+ }
+
+ opcode = TFTP_DATA;
+ continue;
+ }
+ }
+ }
+
+#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;
+ 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
+#define BS "b:"
+#else
+#define BS
+#endif
+
+#ifdef CONFIG_FEATURE_TFTP_GET
+#define GET "g"
+#else
+#define GET
+#endif
+
+#ifdef CONFIG_FEATURE_TFTP_PUT
+#define PUT "p"
+#else
+#define PUT
+#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;
+#endif
+#ifdef CONFIG_FEATURE_TFTP_GET
+ case 'g':
+ cmd = tftp_cmd_get;
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
+ break;
+#endif
+#ifdef CONFIG_FEATURE_TFTP_PUT
+ case 'p':
+ cmd = tftp_cmd_put;
+ flags = O_RDONLY;
+ break;
+#endif
+ case 'l':
+ localfile = optarg;
+ break;
+ case 'r':
+ remotefile = optarg;
+ break;
+ }
+ }
+
+ if ((cmd == 0) || (optind == argc)) {
+ bb_show_usage();
+ }
+ if(localfile && strcmp(localfile, "-") == 0) {
+ fd = fileno((cmd==tftp_cmd_get)? stdout : stdin);
+ }
+ if(localfile == NULL)
+ localfile = remotefile;
+ if(remotefile == NULL)
+ remotefile = localfile;
+ if (fd==-1) {
+ fd = open(localfile, flags, 0644);
+ }
+ if (fd < 0) {
+ bb_perror_msg_and_die("local file");
+ }
+
+ 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\", "
+ "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
+ if (!(fd == STDOUT_FILENO || fd == STDIN_FILENO)) {
+ close(fd);
+ }
+#endif
+ return(result);
+}
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