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"
57 struct len_and_sockaddr *lsa;
61 char buf[4]; /* actually [BUFSZ] */
63 #define G (*(struct globals*)&bb_common_bufsiz1)
64 enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
65 struct BUG_G_too_big {
66 char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
68 #define user (G.user )
69 #define password (G.password )
71 #define control_stream (G.control_stream)
72 #define verbose_flag (G.verbose_flag )
73 #define do_continue (G.do_continue )
75 #define INIT_G() do { } while (0)
78 static void ftp_die(const char *msg) NORETURN;
79 static void ftp_die(const char *msg)
81 char *cp = buf; /* buf holds peer's response */
83 /* Guard against garbage from remote server */
84 while (*cp >= ' ' && *cp < '\x7f')
87 bb_error_msg_and_die("unexpected server response%s%s: %s",
88 (msg ? " to " : ""), (msg ? msg : ""), buf);
91 static int ftpcmd(const char *s1, const char *s2)
96 bb_error_msg("cmd %s %s", s1, s2);
100 fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
102 fflush(control_stream);
106 strcpy(buf, "EOF"); /* for ftp_die */
107 if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
110 } while (!isdigit(buf[0]) || buf[3] != ' ');
118 static void ftp_login(void)
120 /* Connect to the command socket */
121 control_stream = fdopen(xconnect_stream(lsa), "r+");
122 if (control_stream == NULL) {
123 /* fdopen failed - extremely unlikely */
124 bb_perror_nomsg_and_die();
127 if (ftpcmd(NULL, NULL) != 220) {
131 /* Login to the server */
132 switch (ftpcmd("USER", user)) {
136 if (ftpcmd("PASS", password) != 230) {
144 ftpcmd("TYPE I", NULL);
147 static int xconnect_ftpdata(void)
153 TODO: PASV command will not work for IPv6. RFC2428 describes
154 IPv6-capable "extended PASV" - EPSV.
156 "EPSV [protocol]" asks server to bind to and listen on a data port
157 in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
158 If not specified, defaults to "same as used for control connection".
159 If server understood you, it should answer "229 <some text>(|||port|)"
160 where "|" are literal pipe chars and "port" is ASCII decimal port#.
162 There is also an IPv6-capable replacement for PORT (EPRT),
163 but we don't need that.
165 NB: PASV may still work for some servers even over IPv6.
166 For example, vsftp happily answers
167 "227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
169 TODO2: need to stop ignoring IP address in PASV response.
172 if (ftpcmd("PASV", NULL) != 227) {
176 /* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
177 * Server's IP is N1.N2.N3.N4 (we ignore it)
178 * Server's port for data connection is P1*256+P2 */
179 buf_ptr = strrchr(buf, ')');
180 if (buf_ptr) *buf_ptr = '\0';
182 buf_ptr = strrchr(buf, ',');
184 port_num = xatoul_range(buf_ptr + 1, 0, 255);
186 buf_ptr = strrchr(buf, ',');
188 port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
190 set_nport(&lsa->u.sa, htons(port_num));
191 return xconnect_stream(lsa);
194 static int pump_data_and_QUIT(int from, int to)
197 if (bb_copyfd_eof(from, to) == -1) {
198 /* error msg is already printed by bb_copyfd_eof */
202 /* close data connection */
203 close(from); /* don't know which one is that, so we close both */
206 /* does server confirm that transfer is finished? */
207 if (ftpcmd(NULL, NULL) != 226) {
210 ftpcmd("QUIT", NULL);
216 int ftp_receive(const char *local_path, char *server_path);
219 int ftp_receive(const char *local_path, char *server_path)
225 /* connect to the data socket */
226 fd_data = xconnect_ftpdata();
228 if (ftpcmd("SIZE", server_path) != 213) {
232 if (LONE_DASH(local_path)) {
233 fd_local = STDOUT_FILENO;
239 /* lstat would be wrong here! */
240 if (stat(local_path, &sbuf) < 0) {
241 bb_perror_msg_and_die("stat");
243 if (sbuf.st_size > 0) {
244 beg_range = sbuf.st_size;
251 sprintf(buf, "REST %"OFF_FMT"u", beg_range);
252 if (ftpcmd(buf, NULL) != 350) {
257 if (ftpcmd("RETR", server_path) > 150) {
261 /* create local file _after_ we know that remote file exists */
262 if (fd_local == -1) {
263 fd_local = xopen(local_path,
264 do_continue ? (O_APPEND | O_WRONLY)
265 : (O_CREAT | O_TRUNC | O_WRONLY)
269 return pump_data_and_QUIT(fd_data, fd_local);
274 int ftp_send(const char *server_path, char *local_path);
277 int ftp_send(const char *server_path, char *local_path)
283 /* connect to the data socket */
284 fd_data = xconnect_ftpdata();
286 /* get the local file */
287 fd_local = STDIN_FILENO;
288 if (NOT_LONE_DASH(local_path))
289 fd_local = xopen(local_path, O_RDONLY);
291 response = ftpcmd("STOR", server_path);
300 return pump_data_and_QUIT(fd_local, fd_data);
304 #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
305 static const char ftpgetput_longopts[] ALIGN1 =
306 "continue\0" Required_argument "c"
307 "verbose\0" No_argument "v"
308 "username\0" Required_argument "u"
309 "password\0" Required_argument "p"
310 "port\0" Required_argument "P"
314 int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
315 int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
317 const char *port = "ftp";
318 /* socket to ftp server */
320 #if ENABLE_FTPPUT && !ENABLE_FTPGET
321 # define ftp_action ftp_send
322 #elif ENABLE_FTPGET && !ENABLE_FTPPUT
323 # define ftp_action ftp_receive
325 int (*ftp_action)(const char *, char *) = ftp_send;
327 /* Check to see if the command is ftpget or ftput */
328 if (applet_name[3] == 'g') {
329 ftp_action = ftp_receive;
334 /* Set default values */
336 password = "busybox@";
339 * Decipher the command line
341 #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
342 applet_long_options = ftpgetput_longopts;
344 opt_complementary = "-2:vv:cc"; /* must have 2 to 3 params; -v and -c count */
345 getopt32(argv, "cvu:p:P:", &user, &password, &port,
346 &verbose_flag, &do_continue);
349 /* We want to do exactly _one_ DNS lookup, since some
350 * sites (i.e. ftp.us.debian.org) use round-robin DNS
351 * and we want to connect to only one IP... */
352 lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
354 printf("Connecting to %s (%s)\n", argv[0],
355 xmalloc_sockaddr2dotted(&lsa->u.sa));
359 return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);