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path: root/networking/ftpgetput.c (plain)
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1/* vi: set sw=4 ts=4: */
2/*
3 * ftpget
4 *
5 * Mini implementation of FTP to retrieve a remote file.
6 *
7 * Copyright (C) 2002 Jeff Angielski, The PTR Group <jeff@theptrgroup.com>
8 * Copyright (C) 2002 Glenn McGrath
9 *
10 * Based on wget.c by Chip Rosenthal Covad Communications
11 * <chip@laserlink.net>
12 *
13 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
14 */
15//config:config FTPGET
16//config: bool "ftpget"
17//config: default y
18//config: help
19//config: Retrieve a remote file via FTP.
20//config:
21//config:config FTPPUT
22//config: bool "ftpput"
23//config: default y
24//config: help
25//config: Store a remote file via FTP.
26//config:
27//config:config FEATURE_FTPGETPUT_LONG_OPTIONS
28//config: bool "Enable long options in ftpget/ftpput"
29//config: default y
30//config: depends on LONG_OPTS && (FTPGET || FTPPUT)
31//config: help
32//config: Support long options for the ftpget/ftpput applet.
33
34//applet:IF_FTPGET(APPLET_ODDNAME(ftpget, ftpgetput, BB_DIR_USR_BIN, BB_SUID_DROP, ftpget))
35//applet:IF_FTPPUT(APPLET_ODDNAME(ftpput, ftpgetput, BB_DIR_USR_BIN, BB_SUID_DROP, ftpput))
36
37//kbuild:lib-$(CONFIG_FTPGET) += ftpgetput.o
38//kbuild:lib-$(CONFIG_FTPPUT) += ftpgetput.o
39
40//usage:#define ftpget_trivial_usage
41//usage: "[OPTIONS] HOST [LOCAL_FILE] REMOTE_FILE"
42//usage:#define ftpget_full_usage "\n\n"
43//usage: "Download a file via FTP\n"
44//usage: IF_FEATURE_FTPGETPUT_LONG_OPTIONS(
45//usage: "\n -c,--continue Continue previous transfer"
46//usage: "\n -v,--verbose Verbose"
47//usage: "\n -u,--username USER Username"
48//usage: "\n -p,--password PASS Password"
49//usage: "\n -P,--port NUM Port"
50//usage: )
51//usage: IF_NOT_FEATURE_FTPGETPUT_LONG_OPTIONS(
52//usage: "\n -c Continue previous transfer"
53//usage: "\n -v Verbose"
54//usage: "\n -u USER Username"
55//usage: "\n -p PASS Password"
56//usage: "\n -P NUM Port"
57//usage: )
58//usage:
59//usage:#define ftpput_trivial_usage
60//usage: "[OPTIONS] HOST [REMOTE_FILE] LOCAL_FILE"
61//usage:#define ftpput_full_usage "\n\n"
62//usage: "Upload a file to a FTP server\n"
63//usage: IF_FEATURE_FTPGETPUT_LONG_OPTIONS(
64//usage: "\n -v,--verbose Verbose"
65//usage: "\n -u,--username USER Username"
66//usage: "\n -p,--password PASS Password"
67//usage: "\n -P,--port NUM Port"
68//usage: )
69//usage: IF_NOT_FEATURE_FTPGETPUT_LONG_OPTIONS(
70//usage: "\n -v Verbose"
71//usage: "\n -u USER Username"
72//usage: "\n -p PASS Password"
73//usage: "\n -P NUM Port number"
74//usage: )
75
76#include "libbb.h"
77#include "common_bufsiz.h"
78
79struct globals {
80 const char *user;
81 const char *password;
82 struct len_and_sockaddr *lsa;
83 FILE *control_stream;
84 int verbose_flag;
85 int do_continue;
86 char buf[4]; /* actually [BUFSZ] */
87} FIX_ALIASING;
88#define G (*(struct globals*)bb_common_bufsiz1)
89enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
90#define user (G.user )
91#define password (G.password )
92#define lsa (G.lsa )
93#define control_stream (G.control_stream)
94#define verbose_flag (G.verbose_flag )
95#define do_continue (G.do_continue )
96#define buf (G.buf )
97#define INIT_G() do { \
98 setup_common_bufsiz(); \
99 BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
100} while (0)
101
102
103static void ftp_die(const char *msg) NORETURN;
104static void ftp_die(const char *msg)
105{
106 char *cp = buf; /* buf holds peer's response */
107
108 /* Guard against garbage from remote server */
109 while (*cp >= ' ' && *cp < '\x7f')
110 cp++;
111 *cp = '\0';
112 bb_error_msg_and_die("unexpected server response%s%s: %s",
113 (msg ? " to " : ""), (msg ? msg : ""), buf);
114}
115
116static int ftpcmd(const char *s1, const char *s2)
117{
118 unsigned n;
119
120 if (verbose_flag) {
121 bb_error_msg("cmd %s %s", s1, s2);
122 }
123
124 if (s1) {
125 fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
126 s1, s2);
127 fflush(control_stream);
128 }
129
130 do {
131 strcpy(buf, "EOF"); /* for ftp_die */
132 if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
133 ftp_die(NULL);
134 }
135 } while (!isdigit(buf[0]) || buf[3] != ' ');
136
137 buf[3] = '\0';
138 n = xatou(buf);
139 buf[3] = ' ';
140 return n;
141}
142
143static void ftp_login(void)
144{
145 /* Connect to the command socket */
146 control_stream = fdopen(xconnect_stream(lsa), "r+");
147 if (control_stream == NULL) {
148 /* fdopen failed - extremely unlikely */
149 bb_perror_nomsg_and_die();
150 }
151
152 if (ftpcmd(NULL, NULL) != 220) {
153 ftp_die(NULL);
154 }
155
156 /* Login to the server */
157 switch (ftpcmd("USER", user)) {
158 case 230:
159 break;
160 case 331:
161 if (ftpcmd("PASS", password) != 230) {
162 ftp_die("PASS");
163 }
164 break;
165 default:
166 ftp_die("USER");
167 }
168
169 ftpcmd("TYPE I", NULL);
170}
171
172static int xconnect_ftpdata(void)
173{
174 char *buf_ptr;
175 unsigned port_num;
176
177/*
178TODO: PASV command will not work for IPv6. RFC2428 describes
179IPv6-capable "extended PASV" - EPSV.
180
181"EPSV [protocol]" asks server to bind to and listen on a data port
182in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
183If not specified, defaults to "same as used for control connection".
184If server understood you, it should answer "229 <some text>(|||port|)"
185where "|" are literal pipe chars and "port" is ASCII decimal port#.
186
187There is also an IPv6-capable replacement for PORT (EPRT),
188but we don't need that.
189
190NB: PASV may still work for some servers even over IPv6.
191For example, vsftp happily answers
192"227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
193
194TODO2: need to stop ignoring IP address in PASV response.
195*/
196
197 if (ftpcmd("PASV", NULL) != 227) {
198 ftp_die("PASV");
199 }
200
201 /* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
202 * Server's IP is N1.N2.N3.N4 (we ignore it)
203 * Server's port for data connection is P1*256+P2 */
204 buf_ptr = strrchr(buf, ')');
205 if (buf_ptr) *buf_ptr = '\0';
206
207 buf_ptr = strrchr(buf, ',');
208 *buf_ptr = '\0';
209 port_num = xatoul_range(buf_ptr + 1, 0, 255);
210
211 buf_ptr = strrchr(buf, ',');
212 *buf_ptr = '\0';
213 port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
214
215 set_nport(&lsa->u.sa, htons(port_num));
216 return xconnect_stream(lsa);
217}
218
219static int pump_data_and_QUIT(int from, int to)
220{
221 /* copy the file */
222 if (bb_copyfd_eof(from, to) == -1) {
223 /* error msg is already printed by bb_copyfd_eof */
224 return EXIT_FAILURE;
225 }
226
227 /* close data connection */
228 close(from); /* don't know which one is that, so we close both */
229 close(to);
230
231 /* does server confirm that transfer is finished? */
232 if (ftpcmd(NULL, NULL) != 226) {
233 ftp_die(NULL);
234 }
235 ftpcmd("QUIT", NULL);
236
237 return EXIT_SUCCESS;
238}
239
240#if !ENABLE_FTPGET
241int ftp_receive(const char *local_path, char *server_path);
242#else
243static
244int ftp_receive(const char *local_path, char *server_path)
245{
246 int fd_data;
247 int fd_local = -1;
248 filesize_t beg_range = 0;
249
250 /* connect to the data socket */
251 fd_data = xconnect_ftpdata();
252
253 if (ftpcmd("SIZE", server_path) != 213) {
254 do_continue = 0;
255 }
256
257 if (LONE_DASH(local_path)) {
258 fd_local = STDOUT_FILENO;
259 do_continue = 0;
260 }
261
262 if (do_continue) {
263 struct stat sbuf;
264 /* lstat would be wrong here! */
265 if (stat(local_path, &sbuf) < 0) {
266 bb_perror_msg_and_die("stat");
267 }
268 if (sbuf.st_size > 0) {
269 beg_range = sbuf.st_size;
270 } else {
271 do_continue = 0;
272 }
273 }
274
275 if (do_continue) {
276 sprintf(buf, "REST %"FILESIZE_FMT"u", beg_range);
277 if (ftpcmd(buf, NULL) != 350) {
278 do_continue = 0;
279 }
280 }
281
282 if (ftpcmd("RETR", server_path) > 150) {
283 ftp_die("RETR");
284 }
285
286 /* create local file _after_ we know that remote file exists */
287 if (fd_local == -1) {
288 fd_local = xopen(local_path,
289 do_continue ? (O_APPEND | O_WRONLY)
290 : (O_CREAT | O_TRUNC | O_WRONLY)
291 );
292 }
293
294 return pump_data_and_QUIT(fd_data, fd_local);
295}
296#endif
297
298#if !ENABLE_FTPPUT
299int ftp_send(const char *server_path, char *local_path);
300#else
301static
302int ftp_send(const char *server_path, char *local_path)
303{
304 int fd_data;
305 int fd_local;
306 int response;
307
308 /* connect to the data socket */
309 fd_data = xconnect_ftpdata();
310
311 /* get the local file */
312 fd_local = STDIN_FILENO;
313 if (NOT_LONE_DASH(local_path))
314 fd_local = xopen(local_path, O_RDONLY);
315
316 response = ftpcmd("STOR", server_path);
317 switch (response) {
318 case 125:
319 case 150:
320 break;
321 default:
322 ftp_die("STOR");
323 }
324
325 return pump_data_and_QUIT(fd_local, fd_data);
326}
327#endif
328
329#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
330static const char ftpgetput_longopts[] ALIGN1 =
331 "continue\0" Required_argument "c"
332 "verbose\0" No_argument "v"
333 "username\0" Required_argument "u"
334 "password\0" Required_argument "p"
335 "port\0" Required_argument "P"
336 ;
337#endif
338
339int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
340int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
341{
342 const char *port = "ftp";
343 /* socket to ftp server */
344
345#if ENABLE_FTPPUT && !ENABLE_FTPGET
346# define ftp_action ftp_send
347#elif ENABLE_FTPGET && !ENABLE_FTPPUT
348# define ftp_action ftp_receive
349#else
350 int (*ftp_action)(const char *, char *) = ftp_send;
351
352 /* Check to see if the command is ftpget or ftput */
353 if (applet_name[3] == 'g') {
354 ftp_action = ftp_receive;
355 }
356#endif
357
358 INIT_G();
359 /* Set default values */
360 user = "anonymous";
361 password = "busybox@";
362
363 /*
364 * Decipher the command line
365 */
366#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
367 applet_long_options = ftpgetput_longopts;
368#endif
369 opt_complementary = "-2:vv:cc"; /* must have 2 to 3 params; -v and -c count */
370 getopt32(argv, "cvu:p:P:", &user, &password, &port,
371 &verbose_flag, &do_continue);
372 argv += optind;
373
374 /* We want to do exactly _one_ DNS lookup, since some
375 * sites (i.e. ftp.us.debian.org) use round-robin DNS
376 * and we want to connect to only one IP... */
377 lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
378 if (verbose_flag) {
379 printf("Connecting to %s (%s)\n", argv[0],
380 xmalloc_sockaddr2dotted(&lsa->u.sa));
381 }
382
383 ftp_login();
384 return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);
385}
386
generated by cgit at 2024-05-15 00:15:16 (GMT)