1 /* vi: set sw=4 ts=4: */
5 * Mini implementation of FTP to retrieve a remote file.
7 * Copyright (C) 2002 Jeff Angielski, The PTR Group <jeff@theptrgroup.com>
8 * Copyright (C) 2002 Glenn McGrath
10 * Based on wget.c by Chip Rosenthal Covad Communications
11 * <chip@laserlink.net>
13 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
16 //usage:#define ftpget_trivial_usage
17 //usage: "[OPTIONS] HOST [LOCAL_FILE] REMOTE_FILE"
18 //usage:#define ftpget_full_usage "\n\n"
19 //usage: "Download a file via FTP\n"
20 //usage: IF_FEATURE_FTPGETPUT_LONG_OPTIONS(
21 //usage: "\n -c,--continue Continue previous transfer"
22 //usage: "\n -v,--verbose Verbose"
23 //usage: "\n -u,--username USER Username"
24 //usage: "\n -p,--password PASS Password"
25 //usage: "\n -P,--port NUM Port"
27 //usage: IF_NOT_FEATURE_FTPGETPUT_LONG_OPTIONS(
28 //usage: "\n -c Continue previous transfer"
29 //usage: "\n -v Verbose"
30 //usage: "\n -u USER Username"
31 //usage: "\n -p PASS Password"
32 //usage: "\n -P NUM Port"
35 //usage:#define ftpput_trivial_usage
36 //usage: "[OPTIONS] HOST [REMOTE_FILE] LOCAL_FILE"
37 //usage:#define ftpput_full_usage "\n\n"
38 //usage: "Upload a file to a FTP server\n"
39 //usage: IF_FEATURE_FTPGETPUT_LONG_OPTIONS(
40 //usage: "\n -v,--verbose Verbose"
41 //usage: "\n -u,--username USER Username"
42 //usage: "\n -p,--password PASS Password"
43 //usage: "\n -P,--port NUM Port"
45 //usage: IF_NOT_FEATURE_FTPGETPUT_LONG_OPTIONS(
46 //usage: "\n -v Verbose"
47 //usage: "\n -u USER Username"
48 //usage: "\n -p PASS Password"
49 //usage: "\n -P NUM Port number"
53 #include "common_bufsiz.h"
58 struct len_and_sockaddr *lsa;
62 char buf[4]; /* actually [BUFSZ] */
64 #define G (*(struct globals*)bb_common_bufsiz1)
65 enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
66 #define user (G.user )
67 #define password (G.password )
69 #define control_stream (G.control_stream)
70 #define verbose_flag (G.verbose_flag )
71 #define do_continue (G.do_continue )
73 #define INIT_G() do { \
74 setup_common_bufsiz(); \
75 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
79 static void ftp_die(const char *msg) NORETURN;
80 static void ftp_die(const char *msg)
82 char *cp = buf; /* buf holds peer's response */
84 /* Guard against garbage from remote server */
85 while (*cp >= ' ' && *cp < '\x7f')
88 bb_error_msg_and_die("unexpected server response%s%s: %s",
89 (msg ? " to " : ""), (msg ? msg : ""), buf);
92 static int ftpcmd(const char *s1, const char *s2)
97 bb_error_msg("cmd %s %s", s1, s2);
101 fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
103 fflush(control_stream);
107 strcpy(buf, "EOF"); /* for ftp_die */
108 if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
111 } while (!isdigit(buf[0]) || buf[3] != ' ');
119 static void ftp_login(void)
121 /* Connect to the command socket */
122 control_stream = fdopen(xconnect_stream(lsa), "r+");
123 if (control_stream == NULL) {
124 /* fdopen failed - extremely unlikely */
125 bb_perror_nomsg_and_die();
128 if (ftpcmd(NULL, NULL) != 220) {
132 /* Login to the server */
133 switch (ftpcmd("USER", user)) {
137 if (ftpcmd("PASS", password) != 230) {
145 ftpcmd("TYPE I", NULL);
148 static int xconnect_ftpdata(void)
154 TODO: PASV command will not work for IPv6. RFC2428 describes
155 IPv6-capable "extended PASV" - EPSV.
157 "EPSV [protocol]" asks server to bind to and listen on a data port
158 in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
159 If not specified, defaults to "same as used for control connection".
160 If server understood you, it should answer "229 <some text>(|||port|)"
161 where "|" are literal pipe chars and "port" is ASCII decimal port#.
163 There is also an IPv6-capable replacement for PORT (EPRT),
164 but we don't need that.
166 NB: PASV may still work for some servers even over IPv6.
167 For example, vsftp happily answers
168 "227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
170 TODO2: need to stop ignoring IP address in PASV response.
173 if (ftpcmd("PASV", NULL) != 227) {
177 /* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
178 * Server's IP is N1.N2.N3.N4 (we ignore it)
179 * Server's port for data connection is P1*256+P2 */
180 buf_ptr = strrchr(buf, ')');
181 if (buf_ptr) *buf_ptr = '\0';
183 buf_ptr = strrchr(buf, ',');
185 port_num = xatoul_range(buf_ptr + 1, 0, 255);
187 buf_ptr = strrchr(buf, ',');
189 port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
191 set_nport(&lsa->u.sa, htons(port_num));
192 return xconnect_stream(lsa);
195 static int pump_data_and_QUIT(int from, int to)
198 if (bb_copyfd_eof(from, to) == -1) {
199 /* error msg is already printed by bb_copyfd_eof */
203 /* close data connection */
204 close(from); /* don't know which one is that, so we close both */
207 /* does server confirm that transfer is finished? */
208 if (ftpcmd(NULL, NULL) != 226) {
211 ftpcmd("QUIT", NULL);
217 int ftp_receive(const char *local_path, char *server_path);
220 int ftp_receive(const char *local_path, char *server_path)
226 /* connect to the data socket */
227 fd_data = xconnect_ftpdata();
229 if (ftpcmd("SIZE", server_path) != 213) {
233 if (LONE_DASH(local_path)) {
234 fd_local = STDOUT_FILENO;
240 /* lstat would be wrong here! */
241 if (stat(local_path, &sbuf) < 0) {
242 bb_perror_msg_and_die("stat");
244 if (sbuf.st_size > 0) {
245 beg_range = sbuf.st_size;
252 sprintf(buf, "REST %"OFF_FMT"u", beg_range);
253 if (ftpcmd(buf, NULL) != 350) {
258 if (ftpcmd("RETR", server_path) > 150) {
262 /* create local file _after_ we know that remote file exists */
263 if (fd_local == -1) {
264 fd_local = xopen(local_path,
265 do_continue ? (O_APPEND | O_WRONLY)
266 : (O_CREAT | O_TRUNC | O_WRONLY)
270 return pump_data_and_QUIT(fd_data, fd_local);
275 int ftp_send(const char *server_path, char *local_path);
278 int ftp_send(const char *server_path, char *local_path)
284 /* connect to the data socket */
285 fd_data = xconnect_ftpdata();
287 /* get the local file */
288 fd_local = STDIN_FILENO;
289 if (NOT_LONE_DASH(local_path))
290 fd_local = xopen(local_path, O_RDONLY);
292 response = ftpcmd("STOR", server_path);
301 return pump_data_and_QUIT(fd_local, fd_data);
305 #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
306 static const char ftpgetput_longopts[] ALIGN1 =
307 "continue\0" Required_argument "c"
308 "verbose\0" No_argument "v"
309 "username\0" Required_argument "u"
310 "password\0" Required_argument "p"
311 "port\0" Required_argument "P"
315 int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
316 int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
318 const char *port = "ftp";
319 /* socket to ftp server */
321 #if ENABLE_FTPPUT && !ENABLE_FTPGET
322 # define ftp_action ftp_send
323 #elif ENABLE_FTPGET && !ENABLE_FTPPUT
324 # define ftp_action ftp_receive
326 int (*ftp_action)(const char *, char *) = ftp_send;
328 /* Check to see if the command is ftpget or ftput */
329 if (applet_name[3] == 'g') {
330 ftp_action = ftp_receive;
335 /* Set default values */
337 password = "busybox@";
340 * Decipher the command line
342 #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
343 applet_long_options = ftpgetput_longopts;
345 opt_complementary = "-2:vv:cc"; /* must have 2 to 3 params; -v and -c count */
346 getopt32(argv, "cvu:p:P:", &user, &password, &port,
347 &verbose_flag, &do_continue);
350 /* We want to do exactly _one_ DNS lookup, since some
351 * sites (i.e. ftp.us.debian.org) use round-robin DNS
352 * and we want to connect to only one IP... */
353 lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
355 printf("Connecting to %s (%s)\n", argv[0],
356 xmalloc_sockaddr2dotted(&lsa->u.sa));
360 return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);