aboutsummaryrefslogtreecommitdiff
path: root/tftp.c
diff options
context:
space:
mode:
Diffstat (limited to 'tftp.c')
-rw-r--r--tftp.c574
1 files changed, 0 insertions, 574 deletions
diff --git a/tftp.c b/tftp.c
deleted file mode 100644
index 530b3d134..000000000
--- a/tftp.c
+++ /dev/null
@@ -1,574 +0,0 @@
-/* ------------------------------------------------------------------------- */
-/* 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 BB_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_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 BB_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)) {
- 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 int 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;
-
-#ifdef BB_FEATURE_TFTP_BLOCKSIZE
- int want_option_ack = 0;
-#endif
-
- RESERVE_BB_BUFFER(buf, tftp_bufsize + 4); /* Opcode + Block # + Data */
-
- tftp_bufsize += 4;
-
- if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
- 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 = htons(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)) {
- error_msg("too long remote-filename");
- break;
- }
-
- /* add "mode" part of the package */
-
- memcpy(cp, "octet", 6);
- cp += 6;
-
-#ifdef BB_FEATURE_TFTP_BLOCKSIZE
-
- 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");
- 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 = read(localfd, cp, tftp_bufsize - 4);
-
- if (len < 0) {
- perror_msg("read");
- break;
- }
-
- if (len != (tftp_bufsize - 4)) {
- finished++;
- }
-
- cp += len;
- } else if (finished) {
- break;
- }
- }
-
-
- /* send packet */
-
-
- do {
-
- len = cp - buf;
-
-#ifdef BB_FEATURE_TFTP_DEBUG
- printf("sending %u bytes\n", len);
- for (cp = buf; cp < &buf[len]; cp++)
- printf("%02x ", *cp);
- printf("\n");
-#endif
- if (sendto(socketfd, buf, len, 0,
- (struct sockaddr *) &sa, sizeof(sa)) < 0) {
- perror_msg("send");
- len = -1;
- 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) {
- perror_msg("recvfrom");
- break;
- }
-
- timeout = 0;
-
- if (sa.sin_port == htons(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:
- error_msg("timeout");
-
- if (timeout == 0) {
- len = -1;
- error_msg("last timeout");
- } else {
- timeout--;
- }
- break;
-
- default:
- perror_msg("select");
- len = -1;
- }
-
- } while (timeout && (len >= 0));
-
- if (len < 0) {
- break;
- }
-
- /* process received packet */
-
-
- 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);
-#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_error_msg)
- / sizeof(char *))) {
-
- msg = (char *) tftp_error_msg[tmp];
- }
-
- if (msg) {
- error_msg("server says: %s", msg);
- }
-
- break;
- }
-
-#ifdef BB_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 foo = atoi(res);
-
- if (tftp_blocksize_check(foo,
- tftp_bufsize - 4)) {
-
- if (cmd_put) {
- opcode = TFTP_DATA;
- }
- else {
- opcode = TFTP_ACK;
- }
-#ifdef BB_FEATURE_TFTP_DEBUG
- printf("using blksize %u\n");
-#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;
- }
-#endif
-
- if (cmd_get && (opcode == TFTP_DATA)) {
-
- if (tmp == block_nr) {
-
- len = write(localfd, &buf[4], len - 4);
-
- if (len < 0) {
- perror_msg("write");
- break;
- }
-
- if (len != (tftp_bufsize - 4)) {
- finished++;
- }
-
- opcode = TFTP_ACK;
- continue;
- }
- }
-
- if (cmd_put && (opcode == TFTP_ACK)) {
-
- if (tmp == (block_nr - 1)) {
- if (finished) {
- break;
- }
-
- opcode = TFTP_DATA;
- continue;
- }
- }
- }
-
-#ifdef BB_FEATURE_CLEAN_UP
- close(socketfd);
-
- RELEASE_BB_BUFFER(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;
- 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 BB_FEATURE_TFTP_BLOCKSIZE
-#define BS "b:"
-#else
-#define BS
-#endif
-
-#ifdef BB_FEATURE_TFTP_GET
-#define GET "g"
-#else
-#define GET
-#endif
-
-#ifdef BB_FEATURE_TFTP_PUT
-#define PUT "p"
-#else
-#define PUT
-#endif
-
- while ((opt = getopt(argc, argv, BS GET PUT "l:r:")) != -1) {
- switch (opt) {
-#ifdef BB_FEATURE_TFTP_BLOCKSIZE
- case 'b':
- blocksize = atoi(optarg);
- if (!tftp_blocksize_check(blocksize, 0)) {
- return EXIT_FAILURE;
- }
- break;
-#endif
-#ifdef BB_FEATURE_TFTP_GET
- case 'g':
- cmd = tftp_cmd_get;
- flags = O_WRONLY | O_CREAT;
- break;
-#endif
-#ifdef BB_FEATURE_TFTP_PUT
- case 'p':
- cmd = tftp_cmd_put;
- flags = O_RDONLY;
- break;
-#endif
- case 'l':
- localfile = xstrdup(optarg);
- break;
- case 'r':
- remotefile = xstrdup(optarg);
- break;
- }
- }
-
- if ((cmd == 0) || (optind == argc)) {
- show_usage();
- }
-
- fd = open(localfile, flags, 0644);
- if (fd < 0) {
- perror_msg_and_die("local file");
- }
-
- host = xgethostbyname(argv[optind]);
-
- if (optind + 2 == argc) {
- port = atoi(argv[optind + 1]);
- }
-
-#ifdef BB_FEATURE_TFTP_DEBUG
- printf("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 BB_FEATURE_CLEAN_UP
- close(fd);
-#endif
- return(result);
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 11:10:43 +0000