-/* ------------------------------------------------------------------------- */
-/* 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 */
+/* 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 "libbb.h"
+
+#if ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT
+
+#define TFTP_BLOCKSIZE_DEFAULT 512 /* according to RFC 1350, don't change */
+#define TFTP_TIMEOUT_MS 50
+#define TFTP_MAXTIMEOUT_MS 2000
+#define TFTP_NUM_RETRIES 12 /* number of backed-off retries */
/* opcodes we support */
-
#define TFTP_RRQ 1
#define TFTP_WRQ 2
#define TFTP_DATA 3
#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"
-};
+#if ENABLE_FEATURE_TFTP_GET && !ENABLE_FEATURE_TFTP_PUT
+#define USE_GETPUT(...)
+#define CMD_GET(cmd) 1
+#define CMD_PUT(cmd) 0
+#elif !ENABLE_FEATURE_TFTP_GET && ENABLE_FEATURE_TFTP_PUT
+#define USE_GETPUT(...)
+#define CMD_GET(cmd) 0
+#define CMD_PUT(cmd) 1
+#else
+#define USE_GETPUT(...) __VA_ARGS__
+/* masks coming from getpot32 */
+#define CMD_GET(cmd) ((cmd) & 1)
+#define CMD_PUT(cmd) ((cmd) & 2)
+#endif
+/* NB: in the code below
+ * CMD_GET(cmd) and CMD_PUT(cmd) are mutually exclusive
+ */
-static const int tftp_cmd_get = 1;
-static const int tftp_cmd_put = 2;
-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
static int tftp_blocksize_check(int blocksize, int bufsize)
{
- /* Check if the blocksize is valid:
+ /* 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;
+ 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, char *option)
+static char *tftp_option_get(char *buf, int len, const char *option)
{
- int opt_val = 0;
+ 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;
+ /* Make sure the options are terminated correctly */
+ for (k = 0; k < len; k++) {
+ if (buf[k] == '\0') {
+ goto nul_found;
}
}
-
- if (k >= len) {
- break;
- }
-
+ return NULL;
+ nul_found:
if (opt_val == 0) {
if (strcasecmp(buf, option) == 0) {
- opt_found = 1;
- }
- }
- else {
- if (opt_found) {
- return buf;
+ opt_found = 1;
}
+ } else if (opt_found) {
+ return buf;
}
k++;
-
buf += k;
len -= k;
-
opt_val ^= 1;
}
#endif
-static inline int tftp(const int cmd, const struct hostent *host,
- const char *remotefile, int localfd, const unsigned short port, int tftp_bufsize)
+static int tftp( USE_GETPUT(const int cmd,)
+ len_and_sockaddr *peer_lsa,
+ const char *remotefile, const int localfd,
+ unsigned 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;
+ struct pollfd pfd[1];
+#define socketfd (pfd[0].fd)
int len;
- int opcode = 0;
- int finished = 0;
- int timeout = bb_tftp_num_retries;
- unsigned short block_nr = 1;
+ int send_len;
+ USE_FEATURE_TFTP_BLOCKSIZE(smallint want_option_ack = 0;)
+ smallint finished = 0;
+ uint16_t opcode;
+ uint16_t block_nr = 1;
+ uint16_t recv_blk;
+ int retries, waittime_ms;
+ char *cp;
-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
- int want_option_ack = 0;
-#endif
+ unsigned org_port;
+ len_and_sockaddr *const from = alloca(offsetof(len_and_sockaddr, sa) + peer_lsa->len);
/* 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);
+ /* 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);
- memset(&sa, 0, len);
- bind(socketfd, (struct sockaddr *)&sa, len);
+ port = org_port = htons(port);
- sa.sin_family = host->h_addrtype;
- sa.sin_port = port;
- memcpy(&sa.sin_addr, (struct in_addr *) host->h_addr,
- sizeof(sa.sin_addr));
+ socketfd = xsocket(peer_lsa->sa.sa_family, SOCK_DGRAM, 0);
/* build opcode */
-
- if (cmd_get) {
+ opcode = TFTP_WRQ;
+ if (CMD_GET(cmd)) {
opcode = TFTP_RRQ;
}
-
- if (cmd_put) {
- opcode = TFTP_WRQ;
+ cp = xbuf + 2;
+ /* add filename and mode */
+ /* fill in packet if the filename fits into xbuf */
+ len = strlen(remotefile) + 1;
+ if (2 + len + sizeof("octet") >= tftp_bufsize) {
+ bb_error_msg("remote filename is too long");
+ goto ret;
}
+ strcpy(cp, remotefile);
+ cp += len;
+ /* add "mode" part of the package */
+ strcpy(cp, "octet");
+ cp += sizeof("octet");
+
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ len = tftp_bufsize - 4; /* data block size */
+ if (len != TFTP_BLOCKSIZE_DEFAULT) {
+ /* rfc2348 says that 65464 is a max allowed value */
+ if ((&xbuf[tftp_bufsize - 1] - cp) < sizeof("blksize NNNNN")) {
+ bb_error_msg("remote filename is too long");
+ goto ret;
+ }
+ /* add "blksize", <nul>, blocksize */
+ strcpy(cp, "blksize");
+ cp += sizeof("blksize");
+ cp += snprintf(cp, 6, "%d", len) + 1;
+ want_option_ack = 1;
+ }
+#endif
+ /* First packet is built, so skip packet generation */
+ goto send_pkt;
- while (1) {
-
- cp = buf;
-
- /* first create the opcode part */
-
- *((unsigned short *) cp) = htons(opcode);
+ /* Using mostly goto's - continue/break will be less clear
+ * in where we actually jump to */
+ while (1) {
+ /* Build ACK or DATA */
+ cp = xbuf + 2;
+ *((uint16_t*)cp) = htons(block_nr);
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;
+ block_nr++;
+ opcode = TFTP_ACK;
+ if (CMD_PUT(cmd)) {
+ opcode = TFTP_DATA;
+ len = full_read(localfd, cp, tftp_bufsize - 4);
+ if (len < 0) {
+ bb_perror_msg(bb_msg_read_error);
+ goto ret;
}
-
- 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;
+ if (len != (tftp_bufsize - 4)) {
+ finished = 1;
}
+ 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");
+ send_pkt:
+ /* Send packet */
+ *((uint16_t*)xbuf) = htons(opcode); /* fill in opcode part */
+ send_len = cp - xbuf;
+ /* NB: send_len value is preserved in code below
+ * for potential resend */
+
+ retries = TFTP_NUM_RETRIES; /* re-initialize */
+ waittime_ms = TFTP_TIMEOUT_MS;
+
+ send_again:
+#if ENABLE_DEBUG_TFTP
+ fprintf(stderr, "sending %u bytes\n", send_len);
+ for (cp = xbuf; cp < &xbuf[send_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;
+ xsendto(socketfd, xbuf, send_len, &peer_lsa->sa, peer_lsa->len);
+ /* Was it final ACK? then exit */
+ if (finished && (opcode == TFTP_ACK))
+ goto ret;
+
+ recv_again:
+ /* Receive packet */
+ /*pfd[0].fd = socketfd;*/
+ pfd[0].events = POLLIN;
+ switch (safe_poll(pfd, 1, waittime_ms)) {
+ unsigned from_port;
+ case 1:
+ from->len = peer_lsa->len;
+ memset(&from->sa, 0, peer_lsa->len);
+ len = recvfrom(socketfd, rbuf, tftp_bufsize, 0,
+ &from->sa, &from->len);
+ if (len < 0) {
+ bb_perror_msg("recvfrom");
+ goto ret;
}
-
-
- if (finished && (opcode == TFTP_ACK)) {
- break;
+ from_port = get_nport(&from->sa);
+ if (port == org_port) {
+ /* Our first query went to port 69
+ * but reply will come from different one.
+ * Remember and use this new port */
+ port = from_port;
+ set_nport(peer_lsa, from_port);
}
-
- /* 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(socketfd + 1, &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:
+ if (port != from_port)
+ goto recv_again;
+ goto process_pkt;
+ case 0:
+ retries--;
+ if (retries == 0) {
bb_error_msg("timeout");
-
- timeout--;
- if (timeout == 0) {
- len = -1;
- bb_error_msg("last timeout");
- }
- break;
-
- default:
- bb_perror_msg("select");
- len = -1;
+ goto ret;
}
- } while (timeout && (len >= 0));
+ /* exponential backoff with limit */
+ waittime_ms += waittime_ms/2;
+ if (waittime_ms > TFTP_MAXTIMEOUT_MS) {
+ waittime_ms = TFTP_MAXTIMEOUT_MS;
+ }
- if ((finished) || (len < 0)) {
- break;
+ goto send_again; /* resend last sent pkt */
+ default:
+ /*bb_perror_msg("poll"); - done in safe_poll */
+ goto ret;
}
+ process_pkt:
+ /* Process recv'ed packet */
+ opcode = ntohs( ((uint16_t*)rbuf)[0] );
+ recv_blk = ntohs( ((uint16_t*)rbuf)[1] );
- /* 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);
+#if ENABLE_DEBUG_TFTP
+ fprintf(stderr, "received %d bytes: %04x %04x\n", len, opcode, recv_blk);
#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];
+ static const char *const errcode_str[] = {
+ "",
+ "file not found",
+ "access violation",
+ "disk full",
+ "illegal TFTP operation",
+ "unknown transfer id",
+ "file already exists",
+ "no such user",
+ "bad option"
+ };
+
+ const char *msg = "";
+
+ if (rbuf[4] != '\0') {
+ msg = &rbuf[4];
+ rbuf[tftp_bufsize - 1] = '\0';
+ } else if (recv_blk < ARRAY_SIZE(errcode_str)) {
+ msg = errcode_str[recv_blk];
}
-
- if (msg) {
- bb_error_msg("server says: %s", msg);
- }
-
- break;
+ bb_error_msg("server error: (%u) %s", recv_blk, msg);
+ goto ret;
}
-#ifdef CONFIG_FEATURE_TFTP_BLOCKSIZE
+#if ENABLE_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);
+ want_option_ack = 0;
+
+ if (opcode == TFTP_OACK) {
+ /* server seems to support options */
+ char *res;
+
+ res = tftp_option_get(&rbuf[2], len - 2, "blksize");
+ if (res) {
+ int blksize = xatoi_u(res);
+ if (!tftp_blocksize_check(blksize, tftp_bufsize - 4)) {
+ /* send ERROR 8 to server... */
+ /* htons can be impossible to use in const initializer: */
+ /*static const uint16_t error_8[2] = { htons(TFTP_ERROR), htons(8) };*/
+ /* thus we open-code big-endian layout */
+ static const uint8_t error_8[4] = { 0,TFTP_ERROR, 0,8 };
+ xsendto(socketfd, error_8, 4, &peer_lsa->sa, peer_lsa->len);
+ bb_error_msg("server proposes bad blksize %d, exiting", blksize);
+ goto ret;
+ }
+#if ENABLE_DEBUG_TFTP
+ 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;
+ tftp_bufsize = blksize + 4;
+ /* Send ACK for OACK ("block" no: 0) */
+ block_nr = 0;
+ continue;
+ }
+ /* rfc2347:
+ * "An option not acknowledged by the server
+ * must be ignored by the client and server
+ * as if it were never requested." */
+ }
+
+ bb_error_msg("blksize is not supported by server"
+ " - reverting to 512");
+ tftp_bufsize = TFTP_BLOCKSIZE_DEFAULT + 4;
}
#endif
+ /* block_nr is already advanced to next block# we expect
+ * to get / block# we are about to send next time */
- if (cmd_get && (opcode == TFTP_DATA)) {
-
- if (tmp == block_nr) {
-
- len = bb_full_write(localfd, &buf[4], len - 4);
-
+ if (CMD_GET(cmd) && (opcode == TFTP_DATA)) {
+ if (recv_blk == block_nr) {
+ len = full_write(localfd, &rbuf[4], len - 4);
if (len < 0) {
- bb_perror_msg("write");
- break;
+ bb_perror_msg(bb_msg_write_error);
+ goto ret;
}
-
if (len != (tftp_bufsize - 4)) {
- finished++;
+ finished = 1;
}
-
- opcode = TFTP_ACK;
- continue;
+ continue; /* send ACK */
}
- /* 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) {
+ if (recv_blk == (block_nr - 1)) {
/* Server lost our TFTP_ACK. Resend it */
- block_nr = tmp;
- opcode = TFTP_ACK;
+ block_nr = recv_blk;
continue;
}
}
- if (cmd_put && (opcode == TFTP_ACK)) {
-
- if (tmp == (unsigned short)(block_nr - 1)) {
- if (finished) {
- break;
- }
-
- opcode = TFTP_DATA;
- continue;
+ if (CMD_PUT(cmd) && (opcode == TFTP_ACK)) {
+ /* did server ACK our last DATA pkt? */
+ if (recv_blk == (uint16_t) (block_nr - 1)) {
+ if (finished)
+ goto ret;
+ continue; /* send next block */
}
}
+ /* Awww... recv'd packet is not recognized! */
+ goto recv_again;
+ /* why recv_again? - rfc1123 says:
+ * "The sender (i.e., the side originating the DATA packets)
+ * must never resend the current DATA packet on receipt
+ * of a duplicate ACK".
+ * DATA pkts are resent ONLY on timeout.
+ * Thus "goto send_again" will ba a bad mistake above.
+ * See:
+ * http://en.wikipedia.org/wiki/Sorcerer's_Apprentice_Syndrome
+ */
}
-
-#ifdef CONFIG_FEATURE_CLEAN_UP
- close(socketfd);
-
- free(buf);
-#endif
-
- return finished ? EXIT_SUCCESS : EXIT_FAILURE;
+ ret:
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ close(socketfd);
+ free(xbuf);
+ free(rbuf);
+ }
+ return finished == 0; /* returns 1 on failure */
}
+int tftp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int tftp_main(int argc, char **argv)
{
- struct hostent *host = NULL;
+ len_and_sockaddr *peer_lsa;
const char *localfile = NULL;
const char *remotefile = NULL;
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ const char *sblocksize = NULL;
+#endif
int port;
- int cmd = 0;
+ USE_GETPUT(int cmd;)
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;
+ /* -p or -g is mandatory, and they are mutually exclusive */
+ opt_complementary = "" USE_FEATURE_TFTP_GET("g:") USE_FEATURE_TFTP_PUT("p:")
+ USE_GETPUT("?g--p:p--g");
+
+ USE_GETPUT(cmd =) getopt32(argv,
+ USE_FEATURE_TFTP_GET("g") USE_FEATURE_TFTP_PUT("p")
+ "l:r:" USE_FEATURE_TFTP_BLOCKSIZE("b:"),
+ &localfile, &remotefile
+ USE_FEATURE_TFTP_BLOCKSIZE(, &sblocksize));
+ argv += optind;
+
+ flags = O_RDONLY;
+ if (CMD_GET(cmd))
+ flags = O_WRONLY | O_CREAT | O_TRUNC;
+
+#if ENABLE_FEATURE_TFTP_BLOCKSIZE
+ if (sblocksize) {
+ blocksize = xatoi_u(sblocksize);
+ if (!tftp_blocksize_check(blocksize, 0)) {
+ return EXIT_FAILURE;
}
}
+#endif
- if ((cmd == 0) || (optind == argc)) {
+ if (!localfile)
+ localfile = remotefile;
+ if (!remotefile)
+ remotefile = localfile;
+ /* Error if filename or host is not known */
+ if (!remotefile || !argv[0])
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");
+
+ fd = CMD_GET(cmd) ? STDOUT_FILENO : STDIN_FILENO;
+ if (!LONE_DASH(localfile)) {
+ fd = xopen(localfile, flags);
}
- host = xgethostbyname(argv[optind]);
- port = bb_lookup_port(argv[optind + 1], "udp", 69);
+ port = bb_lookup_port(argv[1], "udp", 69);
+ peer_lsa = xhost2sockaddr(argv[0], port);
-#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);
+#if ENABLE_DEBUG_TFTP
+ fprintf(stderr, "using server '%s', remotefile '%s', localfile '%s'\n",
+ xmalloc_sockaddr2dotted(&peer_lsa->sa),
+ remotefile, localfile);
#endif
- result = tftp(cmd, host, remotefile, fd, port, blocksize);
+ result = tftp( USE_GETPUT(cmd,) peer_lsa, remotefile, fd, port, blocksize);
-#ifdef CONFIG_FEATURE_CLEAN_UP
- if (!(fd == STDOUT_FILENO || fd == STDIN_FILENO)) {
- close(fd);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
+ if (result != EXIT_SUCCESS && !LONE_DASH(localfile) && CMD_GET(cmd)) {
+ unlink(localfile);
}
-#endif
- return(result);
+ return result;
}
+
+#endif /* ENABLE_FEATURE_TFTP_GET || ENABLE_FEATURE_TFTP_PUT */
projects / oweals / busybox.git / blobdiff