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-rw-r--r--networking/tftp.c424
1 files changed, 424 insertions, 0 deletions
diff --git a/networking/tftp.c b/networking/tftp.c
new file mode 100644
index 000000000..f56d6562e
--- /dev/null
+++ b/networking/tftp.c
@@ -0,0 +1,424 @@
+/* ------------------------------------------------------------------------- */
+/* 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 */
+/* */
+/* ------------------------------------------------------------------------- */
+
+#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
+
+/* we don't need #ifdefs with these constants and optimization... */
+
+#ifdef BB_FEATURE_TFTP_GET
+#define BB_TFTP_GET (1 << 0)
+#else
+#define BB_TFTP_GET 0
+#endif
+
+#ifdef BB_FEATURE_TFTP_PUT
+#define BB_TFTP_PUT (1 << 1)
+#else
+#define BB_TFTP_PUT 0
+#endif
+
+#ifdef BB_FEATURE_TFTP_DEBUG
+#define BB_TFTP_DEBUG 1
+#else
+#define BB_TFTP_DEBUG 0
+#endif
+
+#define BB_TFTP_NO_RETRIES 5
+#define BB_TFTP_TIMEOUT 5 /* seconds */
+
+#define RRQ 1 /* read request */
+#define WRQ 2 /* write request */
+#define DATA 3 /* data packet */
+#define ACK 4 /* acknowledgement */
+#define ERROR 5 /* error code */
+
+#define BUFSIZE (512+4)
+
+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"
+};
+
+static inline int tftp(int cmd, struct hostent *host,
+ char *serverfile, int localfd, int port)
+{
+ struct sockaddr_in sa;
+ int socketfd;
+ struct timeval tv;
+ fd_set rfds;
+ struct sockaddr_in from;
+ socklen_t fromlen;
+ char *cp;
+ unsigned short tmp;
+ int len, opcode, finished;
+ int timeout, block_nr;
+
+ RESERVE_BB_BUFFER(buf, BUFSIZE);
+
+ opcode = finished = timeout = 0;
+ block_nr = 1;
+
+ if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
+ perror_msg("socket");
+ return 1;
+ }
+
+ len = sizeof(sa);
+
+ memset(&sa, 0, len);
+ bind(socketfd, &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 & BB_TFTP_GET) {
+ opcode = RRQ;
+ }
+
+ if (cmd & BB_TFTP_PUT) {
+ opcode = WRQ;
+ }
+
+ while (1) {
+
+
+ /* build packet of type "opcode" */
+
+
+ cp = buf;
+
+ *((unsigned short *) cp) = htons(opcode);
+
+ cp += 2;
+
+ /* add filename and mode */
+
+ if ((BB_TFTP_GET && (opcode == RRQ)) ||
+ (BB_TFTP_PUT && (opcode == WRQ))) {
+
+ while (cp != &buf[BUFSIZE - 1]) {
+ if ((*cp = *serverfile++) == '\0')
+ break;
+ cp++;
+ }
+
+ if ((*cp != '\0') || (&buf[BUFSIZE - 1] - cp) < 7) {
+ error_msg("too long server-filename.\n");
+ break;
+ }
+
+ memcpy(cp + 1, "octet", 6);
+ cp += 7;
+ }
+
+ /* add ack and data */
+
+ if ((BB_TFTP_GET && (opcode == ACK)) ||
+ (BB_TFTP_PUT && (opcode == DATA))) {
+
+ *((unsigned short *) cp) = htons(block_nr);
+
+ cp += 2;
+
+ block_nr++;
+
+ if (BB_TFTP_PUT && (opcode == DATA)) {
+ len = read(localfd, cp, BUFSIZE - 4);
+
+ if (len < 0) {
+ perror_msg("read");
+ break;
+ }
+
+ if (len != (BUFSIZE - 4)) {
+ finished++;
+ }
+
+ cp += len;
+ } else if (finished) {
+ break;
+ }
+ }
+
+
+ /* send packet */
+
+
+ do {
+
+ len = cp - buf;
+
+ if (BB_TFTP_DEBUG) {
+ printf("sending %u bytes\n", len);
+
+ for (cp = buf; cp < &buf[len]; cp++)
+ printf("%02x ", *cp);
+ printf("\n");
+ }
+
+ 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 = BB_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,
+ 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;
+ break;
+ }
+
+ if (sa.sin_port == from.sin_port) {
+ break;
+ }
+
+ /* fall-through for bad packets! */
+ /* discard the packet - treat as timeout */
+
+ case 0:
+ error_msg("timeout.\n");
+
+ if (!timeout) {
+ timeout = BB_TFTP_NO_RETRIES;
+ } else {
+ timeout--;
+ }
+
+ if (!timeout) {
+ len = -1;
+ error_msg("last timeout!\n");
+ }
+ 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]));
+
+ if (BB_TFTP_DEBUG) {
+ printf("received %d bytes: %04x %04x\n", len, opcode, tmp);
+ }
+
+ if (BB_TFTP_GET && (opcode == DATA)) {
+
+ if (tmp == block_nr) {
+ len = write(localfd, &buf[4], len - 4);
+
+ if (len < 0) {
+ perror_msg("write");
+ break;
+ }
+
+ if (len != (BUFSIZE - 4)) {
+ finished++;
+ }
+
+ opcode = ACK;
+ continue;
+ }
+ }
+
+ if (BB_TFTP_PUT && (opcode == ACK)) {
+
+ if (tmp == (block_nr - 1)) {
+ if (finished) {
+ break;
+ }
+
+ opcode = DATA;
+ continue;
+ }
+ }
+
+ if (opcode == ERROR) {
+ char *msg = NULL;
+
+ if (buf[4] != '\0') {
+ msg = &buf[4];
+ buf[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.\n", msg);
+ }
+
+ break;
+ }
+ }
+
+ close(socketfd);
+
+ if (finished) {
+ return 0;
+ }
+
+ return 1;
+}
+
+int tftp_main(int argc, char **argv)
+{
+ char *cp, *s;
+ char *serverstr;
+ struct hostent *host;
+ char *serverfile;
+ char *localfile;
+ int cmd, flags, fd, bad;
+
+ host = (void *) serverstr = serverfile = localfile = NULL;
+ flags = cmd = 0;
+ bad = 1;
+
+ if (argc > 3) {
+ if (BB_TFTP_GET && (strcmp(argv[1], "get") == 0)) {
+ cmd = BB_TFTP_GET;
+ flags = O_WRONLY | O_CREAT;
+ serverstr = argv[2];
+ localfile = argv[3];
+ }
+
+ if (BB_TFTP_PUT && (strcmp(argv[1], "put") == 0)) {
+ cmd = BB_TFTP_PUT;
+ flags = O_RDONLY;
+ localfile = argv[2];
+ serverstr = argv[3];
+ }
+
+ }
+
+ if (!(cmd & (BB_TFTP_GET | BB_TFTP_PUT))) {
+ show_usage();
+ }
+
+ for (cp = serverstr; *cp != '\0'; cp++)
+ if (*cp == ':')
+ break;
+
+ if (*cp == ':') {
+
+ serverfile = cp + 1;
+
+ if ((s = strdup(serverstr))) {
+ s[cp - serverstr] = '\0';
+
+ if ((host = gethostbyname(s))) {
+ bad = 0;
+ }
+ }
+
+ free(s);
+ }
+ if (bad) {
+ perror_msg_and_die("bad \"server:file\" combination");
+ }
+
+ if (BB_TFTP_DEBUG) {
+ printf("using server \"%s\", serverfile \"%s\","
+ "localfile \"%s\".\n",
+ inet_ntoa(*((struct in_addr *) host->h_addr)),
+ serverfile, localfile);
+ }
+
+ if ((fd = open(localfile, flags, 0644)) < 0) {
+ perror_msg_and_die("local file");
+ }
+
+ flags = tftp(cmd, host, serverfile, fd, 69);
+
+ close(fd);
+
+ return flags;
+}
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