-/* ------------------------------------------------------------------------- */
-/* 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>
+/* 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 "busybox.h"
-//#define BB_FEATURE_TFTP_DEBUG
-/* we don't need #ifdefs with these constants and optimization... */
+#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 */
-#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
+static const char * const MODE_OCTET = "octet";
+#define MODE_OCTET_LEN 6 /* sizeof(MODE_OCTET)*/
-#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 */
+static const char * const OPTION_BLOCKSIZE = "blksize";
+#define OPTION_BLOCKSIZE_LEN 8 /* sizeof(OPTION_BLOCKSIZE) */
-#define RRQ 1 /* read request */
-#define WRQ 2 /* write request */
-#define DATA 3 /* data packet */
-#define ACK 4 /* acknowledgement */
-#define ERROR 5 /* error code */
+/* 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
-#define BUFSIZE (512+4)
-
-static const char *tftp_error_msg[] = {
+static const char *const tftp_bb_error_msg[] = {
"Undefined error",
"File not found",
"Access violation",
"No such user"
};
-static inline int tftp(int cmd, struct hostent *host,
- char *serverfile, int localfd, int port)
+#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
+
+
+#if ENABLE_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 > 65564)) {
+ bb_error_msg("bad blocksize");
+ return 0;
+ }
+
+ return blocksize;
+}
+
+static char *tftp_option_get(char *buf, int len, const char * const 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 int tftp(const int cmd, const struct hostent *host,
+ const char *remotefile, const int localfd,
+ const unsigned short port, int tftp_bufsize)
{
struct sockaddr_in sa;
- int socketfd;
- struct timeval tv;
- fd_set rfds;
struct sockaddr_in from;
+ struct timeval tv;
socklen_t fromlen;
- char *cp;
+ fd_set rfds;
+ int socketfd;
+ int len;
+ int opcode = 0;
+ int finished = 0;
+ int timeout = TFTP_NUM_RETRIES;
+ unsigned short block_nr = 1;
unsigned short tmp;
- int len, opcode, finished;
- int timeout, block_nr;
+ char *cp;
- RESERVE_BB_BUFFER(buf, BUFSIZE);
+ USE_FEATURE_TFTP_BLOCKSIZE(int want_option_ack = 0;)
- opcode = finished = timeout = 0;
- block_nr = 1;
+ /* Can't use RESERVE_CONFIG_BUFFER here since the allocation
+ * size varies meaning BUFFERS_GO_ON_STACK would fail */
+ /* We must keep the transmit and receive buffers seperate */
+ /* In case we rcv a garbage pkt and we need to rexmit the last pkt */
+ char *xbuf = xmalloc(tftp_bufsize += 4);
+ char *rbuf = xmalloc(tftp_bufsize);
if ((socketfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
- perror_msg("socket");
+ /* need to unlink the localfile, so don't use xsocket here. */
+ bb_perror_msg("socket");
return EXIT_FAILURE;
}
len = sizeof(sa);
memset(&sa, 0, len);
- bind(socketfd, (struct sockaddr *)&sa, len);
+ 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 & BB_TFTP_GET) {
- opcode = RRQ;
+ if (cmd & tftp_cmd_get) {
+ opcode = TFTP_RRQ;
}
-
- if (cmd & BB_TFTP_PUT) {
- opcode = WRQ;
+ if (cmd & tftp_cmd_put) {
+ opcode = TFTP_WRQ;
}
while (1) {
+ cp = xbuf;
- /* build packet of type "opcode" */
+ /* 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;
+
+ /* see if the filename fits into xbuf
+ * and fill in packet. */
+ len = strlen(remotefile) + 1;
+
+ if ((cp + len) >= &xbuf[tftp_bufsize - 1]) {
+ too_long = 1;
+ } else {
+ safe_strncpy(cp, remotefile, len);
+ cp += len;
+ }
- cp = buf;
+ if (too_long || ((&xbuf[tftp_bufsize - 1] - cp) < MODE_OCTET_LEN)) {
+ bb_error_msg("remote filename too long");
+ break;
+ }
- *((unsigned short *) cp) = htons(opcode);
+ /* add "mode" part of the package */
+ memcpy(cp, MODE_OCTET, MODE_OCTET_LEN);
+ cp += MODE_OCTET_LEN;
- cp += 2;
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
- /* add filename and mode */
+ len = tftp_bufsize - 4; /* data block size */
- if ((BB_TFTP_GET && (opcode == RRQ)) ||
- (BB_TFTP_PUT && (opcode == WRQ))) {
+ if (len != TFTP_BLOCKSIZE_DEFAULT) {
- while (cp != &buf[BUFSIZE - 1]) {
- if ((*cp = *serverfile++) == '\0')
+ if ((&xbuf[tftp_bufsize - 1] - cp) < 15) {
+ bb_error_msg("remote filename too long");
break;
- cp++;
- }
+ }
- if ((*cp != '\0') || (&buf[BUFSIZE - 1] - cp) < 7) {
- error_msg("too long server-filename");
- break;
- }
+ /* add "blksize" + number of blocks */
+ memcpy(cp, OPTION_BLOCKSIZE, OPTION_BLOCKSIZE_LEN);
+ cp += OPTION_BLOCKSIZE_LEN;
+ cp += snprintf(cp, 6, "%d", len) + 1;
- memcpy(cp + 1, "octet", 6);
- cp += 7;
+ want_option_ack = 1;
+ }
+#endif
}
/* add ack and data */
- if ((BB_TFTP_GET && (opcode == ACK)) ||
- (BB_TFTP_PUT && (opcode == 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 (BB_TFTP_PUT && (opcode == DATA)) {
- len = read(localfd, cp, BUFSIZE - 4);
+ if ((cmd & tftp_cmd_put) && (opcode == TFTP_DATA)) {
+ len = full_read(localfd, cp, tftp_bufsize - 4);
if (len < 0) {
- perror_msg("read");
+ bb_perror_msg(bb_msg_read_error);
break;
}
- if (len != (BUFSIZE - 4)) {
+ if (len != (tftp_bufsize - 4)) {
finished++;
}
cp += len;
- } else if (finished) {
- break;
}
}
/* send packet */
+ timeout = TFTP_NUM_RETRIES; /* re-initialize */
do {
- len = cp - buf;
+ len = cp - xbuf;
- 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,
+#if ENABLE_DEBUG_TFTP
+ fprintf(stderr, "sending %u bytes\n", len);
+ for (cp = xbuf; cp < &xbuf[len]; cp++)
+ fprintf(stderr, "%02x ", (unsigned char) *cp);
+ fprintf(stderr, "\n");
+#endif
+ if (sendto(socketfd, xbuf, 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 = BB_TFTP_TIMEOUT;
+ 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,
- BUFSIZE, 0,
+ len = recvfrom(socketfd, rbuf, 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;
- break;
}
-
if (sa.sin_port == from.sin_port) {
break;
}
/* fall-through for bad packets! */
/* discard the packet - treat as timeout */
-
+ timeout = TFTP_NUM_RETRIES;
case 0:
- error_msg("timeout");
+ bb_error_msg("timeout");
- if (!timeout) {
- timeout = BB_TFTP_NO_RETRIES;
- } else {
- timeout--;
- }
-
- if (!timeout) {
+ timeout--;
+ if (timeout == 0) {
len = -1;
- error_msg("last 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 *) rbuf));
+ tmp = ntohs(*((unsigned short *) &rbuf[2]));
- opcode = ntohs(*((unsigned short *) buf));
- tmp = ntohs(*((unsigned short *) &buf[2]));
+#if ENABLE_DEBUG_TFTP
+ fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, tmp);
+#endif
+
+ if (opcode == TFTP_ERROR) {
+ const char *msg = NULL;
+
+ if (rbuf[4] != '\0') {
+ msg = &rbuf[4];
+ rbuf[tftp_bufsize - 1] = '\0';
+ } else if (tmp < (sizeof(tftp_bb_error_msg)
+ / sizeof(char *))) {
+
+ msg = tftp_bb_error_msg[tmp];
+ }
- if (BB_TFTP_DEBUG) {
- printf("received %d bytes: %04x %04x\n", len, opcode, tmp);
+ if (msg) {
+ bb_error_msg("server says: %s", msg);
+ }
+
+ break;
}
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ if (want_option_ack) {
- if (BB_TFTP_GET && (opcode == DATA)) {
+ want_option_ack = 0;
+
+ if (opcode == TFTP_OACK) {
+
+ /* server seems to support options */
+
+ char *res;
+
+ res = tftp_option_get(&rbuf[2], len - 2, OPTION_BLOCKSIZE);
+
+ if (res) {
+ int blksize = xatoi_u(res);
+
+ if (tftp_blocksize_check(blksize, tftp_bufsize - 4)) {
+
+ if (cmd & tftp_cmd_put) {
+ opcode = TFTP_DATA;
+ } else {
+ opcode = TFTP_ACK;
+ }
+#if ENABLE_DEBUG_TFTP
+ fprintf(stderr, "using %s %u\n", OPTION_BLOCKSIZE,
+ 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 & tftp_cmd_get) && (opcode == TFTP_DATA)) {
if (tmp == block_nr) {
- len = write(localfd, &buf[4], len - 4);
+
+ len = full_write(localfd, &rbuf[4], len - 4);
if (len < 0) {
- perror_msg("write");
+ bb_perror_msg(bb_msg_write_error);
break;
}
- if (len != (BUFSIZE - 4)) {
+ if (len != (tftp_bufsize - 4)) {
finished++;
}
- opcode = ACK;
+ 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 (BB_TFTP_PUT && (opcode == ACK)) {
+ if ((cmd & tftp_cmd_put) && (opcode == TFTP_ACK)) {
- if (tmp == (block_nr - 1)) {
+ if (tmp == (unsigned short) (block_nr - 1)) {
if (finished) {
break;
}
- opcode = DATA;
+ opcode = TFTP_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", msg);
- }
-
- break;
- }
}
+#if ENABLE_FEATURE_CLEAN_UP
close(socketfd);
+ free(xbuf);
+ free(rbuf);
+#endif
return finished ? EXIT_SUCCESS : EXIT_FAILURE;
}
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];
- }
-
- }
+ struct hostent *host = NULL;
+ const char *localfile = NULL;
+ const char *remotefile = NULL;
+ int port;
+ int cmd = 0;
+ int fd = -1;
+ int flags = 0;
+ int result;
+ int blocksize = TFTP_BLOCKSIZE_DEFAULT;
+
+ /* figure out what to pass to getopt */
+
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ char *sblocksize = NULL;
+
+#define BS "b:"
+#define BS_ARG , &sblocksize
+#else
+#define BS
+#define BS_ARG
+#endif
- if (!(cmd & (BB_TFTP_GET | BB_TFTP_PUT))) {
- show_usage();
- }
+#if ENABLE_FEATURE_TFTP_GET
+#define GET "g"
+#define GET_COMPL ":g"
+#else
+#define GET
+#define GET_COMPL
+#endif
- for (cp = serverstr; *cp != '\0'; cp++)
- if (*cp == ':')
- break;
+#if ENABLE_FEATURE_TFTP_PUT
+#define PUT "p"
+#define PUT_COMPL ":p"
+#else
+#define PUT
+#define PUT_COMPL
+#endif
- if (*cp == ':') {
+#if defined(CONFIG_FEATURE_TFTP_GET) && defined(CONFIG_FEATURE_TFTP_PUT)
+ opt_complementary = GET_COMPL PUT_COMPL ":?g--p:p--g";
+#elif defined(CONFIG_FEATURE_TFTP_GET) || defined(CONFIG_FEATURE_TFTP_PUT)
+ opt_complementary = GET_COMPL PUT_COMPL;
+#endif
- serverfile = cp + 1;
+ cmd = getopt32(argc, argv, GET PUT "l:r:" BS, &localfile, &remotefile BS_ARG);
- s = xstrdup(serverstr);
- s[cp - serverstr] = '\0';
+ cmd &= (tftp_cmd_get | tftp_cmd_put);
+#if ENABLE_FEATURE_TFTP_GET
+ if (cmd == tftp_cmd_get)
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
+#endif
+#if ENABLE_FEATURE_TFTP_PUT
+ if (cmd == tftp_cmd_put)
+ flags = O_RDONLY;
+#endif
- if ((host = gethostbyname(s))) {
- bad = 0;
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ if (sblocksize) {
+ blocksize = xatoi_u(sblocksize);
+ if (!tftp_blocksize_check(blocksize, 0)) {
+ return EXIT_FAILURE;
}
-
- free(s);
- }
- if (bad) {
- error_msg_and_die("bad \"server:file\" combination");
}
+#endif
- if (BB_TFTP_DEBUG) {
- printf("using server \"%s\", serverfile \"%s\","
- "localfile \"%s\".\n",
- inet_ntoa(*((struct in_addr *) host->h_addr)),
- serverfile, localfile);
+ if (localfile == NULL)
+ localfile = remotefile;
+ if (remotefile == NULL)
+ remotefile = localfile;
+ if ((localfile == NULL && remotefile == NULL) || (argv[optind] == NULL))
+ bb_show_usage();
+
+ if (localfile == NULL || LONE_DASH(localfile)) {
+ fd = (cmd == tftp_cmd_get) ? STDOUT_FILENO : STDIN_FILENO;
+ } else {
+ fd = open(localfile, flags, 0644); /* fail below */
}
-
- if ((fd = open(localfile, flags, 0644)) < 0) {
- perror_msg_and_die("local file");
+ if (fd < 0) {
+ bb_perror_msg_and_die("local file");
}
- flags = tftp(cmd, host, serverfile, fd, 69);
+ host = xgethostbyname(argv[optind]);
+ port = bb_lookup_port(argv[optind + 1], "udp", 69);
+
+#if ENABLE_DEBUG_TFTP
+ fprintf(stderr, "using server \"%s\", remotefile \"%s\", "
+ "localfile \"%s\".\n",
+ inet_ntoa(*((struct in_addr *) host->h_addr)),
+ remotefile, localfile);
+#endif
- close(fd);
+ result = tftp(cmd, host, remotefile, fd, port, blocksize);
- return flags;
+ 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