blob: 8ab078fd4501877ec5a7e6a52ab33183d840b4ca
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 | |
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" |
26 | //usage: ) |
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" |
33 | //usage: ) |
34 | //usage: |
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" |
44 | //usage: ) |
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" |
50 | //usage: ) |
51 | |
52 | #include "libbb.h" |
53 | |
54 | struct globals { |
55 | const char *user; |
56 | const char *password; |
57 | struct len_and_sockaddr *lsa; |
58 | FILE *control_stream; |
59 | int verbose_flag; |
60 | int do_continue; |
61 | char buf[4]; /* actually [BUFSZ] */ |
62 | } FIX_ALIASING; |
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]; |
67 | }; |
68 | #define user (G.user ) |
69 | #define password (G.password ) |
70 | #define lsa (G.lsa ) |
71 | #define control_stream (G.control_stream) |
72 | #define verbose_flag (G.verbose_flag ) |
73 | #define do_continue (G.do_continue ) |
74 | #define buf (G.buf ) |
75 | #define INIT_G() do { } while (0) |
76 | |
77 | |
78 | static void ftp_die(const char *msg) NORETURN; |
79 | static void ftp_die(const char *msg) |
80 | { |
81 | char *cp = buf; /* buf holds peer's response */ |
82 | |
83 | /* Guard against garbage from remote server */ |
84 | while (*cp >= ' ' && *cp < '\x7f') |
85 | cp++; |
86 | *cp = '\0'; |
87 | bb_error_msg_and_die("unexpected server response%s%s: %s", |
88 | (msg ? " to " : ""), (msg ? msg : ""), buf); |
89 | } |
90 | |
91 | static int ftpcmd(const char *s1, const char *s2) |
92 | { |
93 | unsigned n; |
94 | |
95 | if (verbose_flag) { |
96 | bb_error_msg("cmd %s %s", s1, s2); |
97 | } |
98 | |
99 | if (s1) { |
100 | fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3), |
101 | s1, s2); |
102 | fflush(control_stream); |
103 | } |
104 | |
105 | do { |
106 | strcpy(buf, "EOF"); /* for ftp_die */ |
107 | if (fgets(buf, BUFSZ - 2, control_stream) == NULL) { |
108 | ftp_die(NULL); |
109 | } |
110 | } while (!isdigit(buf[0]) || buf[3] != ' '); |
111 | |
112 | buf[3] = '\0'; |
113 | n = xatou(buf); |
114 | buf[3] = ' '; |
115 | return n; |
116 | } |
117 | |
118 | static void ftp_login(void) |
119 | { |
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(); |
125 | } |
126 | |
127 | if (ftpcmd(NULL, NULL) != 220) { |
128 | ftp_die(NULL); |
129 | } |
130 | |
131 | /* Login to the server */ |
132 | switch (ftpcmd("USER", user)) { |
133 | case 230: |
134 | break; |
135 | case 331: |
136 | if (ftpcmd("PASS", password) != 230) { |
137 | ftp_die("PASS"); |
138 | } |
139 | break; |
140 | default: |
141 | ftp_die("USER"); |
142 | } |
143 | |
144 | ftpcmd("TYPE I", NULL); |
145 | } |
146 | |
147 | static int xconnect_ftpdata(void) |
148 | { |
149 | char *buf_ptr; |
150 | unsigned port_num; |
151 | |
152 | /* |
153 | TODO: PASV command will not work for IPv6. RFC2428 describes |
154 | IPv6-capable "extended PASV" - EPSV. |
155 | |
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#. |
161 | |
162 | There is also an IPv6-capable replacement for PORT (EPRT), |
163 | but we don't need that. |
164 | |
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. |
168 | |
169 | TODO2: need to stop ignoring IP address in PASV response. |
170 | */ |
171 | |
172 | if (ftpcmd("PASV", NULL) != 227) { |
173 | ftp_die("PASV"); |
174 | } |
175 | |
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'; |
181 | |
182 | buf_ptr = strrchr(buf, ','); |
183 | *buf_ptr = '\0'; |
184 | port_num = xatoul_range(buf_ptr + 1, 0, 255); |
185 | |
186 | buf_ptr = strrchr(buf, ','); |
187 | *buf_ptr = '\0'; |
188 | port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256; |
189 | |
190 | set_nport(&lsa->u.sa, htons(port_num)); |
191 | return xconnect_stream(lsa); |
192 | } |
193 | |
194 | static int pump_data_and_QUIT(int from, int to) |
195 | { |
196 | /* copy the file */ |
197 | if (bb_copyfd_eof(from, to) == -1) { |
198 | /* error msg is already printed by bb_copyfd_eof */ |
199 | return EXIT_FAILURE; |
200 | } |
201 | |
202 | /* close data connection */ |
203 | close(from); /* don't know which one is that, so we close both */ |
204 | close(to); |
205 | |
206 | /* does server confirm that transfer is finished? */ |
207 | if (ftpcmd(NULL, NULL) != 226) { |
208 | ftp_die(NULL); |
209 | } |
210 | ftpcmd("QUIT", NULL); |
211 | |
212 | return EXIT_SUCCESS; |
213 | } |
214 | |
215 | #if !ENABLE_FTPGET |
216 | int ftp_receive(const char *local_path, char *server_path); |
217 | #else |
218 | static |
219 | int ftp_receive(const char *local_path, char *server_path) |
220 | { |
221 | int fd_data; |
222 | int fd_local = -1; |
223 | filesize_t beg_range = 0; |
224 | |
225 | /* connect to the data socket */ |
226 | fd_data = xconnect_ftpdata(); |
227 | |
228 | if (ftpcmd("SIZE", server_path) != 213) { |
229 | do_continue = 0; |
230 | } |
231 | |
232 | if (LONE_DASH(local_path)) { |
233 | fd_local = STDOUT_FILENO; |
234 | do_continue = 0; |
235 | } |
236 | |
237 | if (do_continue) { |
238 | struct stat sbuf; |
239 | /* lstat would be wrong here! */ |
240 | if (stat(local_path, &sbuf) < 0) { |
241 | bb_perror_msg_and_die("stat"); |
242 | } |
243 | if (sbuf.st_size > 0) { |
244 | beg_range = sbuf.st_size; |
245 | } else { |
246 | do_continue = 0; |
247 | } |
248 | } |
249 | |
250 | if (do_continue) { |
251 | sprintf(buf, "REST %"FILESIZE_FMT"u", beg_range); |
252 | if (ftpcmd(buf, NULL) != 350) { |
253 | do_continue = 0; |
254 | } |
255 | } |
256 | |
257 | if (ftpcmd("RETR", server_path) > 150) { |
258 | ftp_die("RETR"); |
259 | } |
260 | |
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) |
266 | ); |
267 | } |
268 | |
269 | return pump_data_and_QUIT(fd_data, fd_local); |
270 | } |
271 | #endif |
272 | |
273 | #if !ENABLE_FTPPUT |
274 | int ftp_send(const char *server_path, char *local_path); |
275 | #else |
276 | static |
277 | int ftp_send(const char *server_path, char *local_path) |
278 | { |
279 | int fd_data; |
280 | int fd_local; |
281 | int response; |
282 | |
283 | /* connect to the data socket */ |
284 | fd_data = xconnect_ftpdata(); |
285 | |
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); |
290 | |
291 | response = ftpcmd("STOR", server_path); |
292 | switch (response) { |
293 | case 125: |
294 | case 150: |
295 | break; |
296 | default: |
297 | ftp_die("STOR"); |
298 | } |
299 | |
300 | return pump_data_and_QUIT(fd_local, fd_data); |
301 | } |
302 | #endif |
303 | |
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" |
311 | ; |
312 | #endif |
313 | |
314 | int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
315 | int ftpgetput_main(int argc UNUSED_PARAM, char **argv) |
316 | { |
317 | const char *port = "ftp"; |
318 | /* socket to ftp server */ |
319 | |
320 | #if ENABLE_FTPPUT && !ENABLE_FTPGET |
321 | # define ftp_action ftp_send |
322 | #elif ENABLE_FTPGET && !ENABLE_FTPPUT |
323 | # define ftp_action ftp_receive |
324 | #else |
325 | int (*ftp_action)(const char *, char *) = ftp_send; |
326 | |
327 | /* Check to see if the command is ftpget or ftput */ |
328 | if (applet_name[3] == 'g') { |
329 | ftp_action = ftp_receive; |
330 | } |
331 | #endif |
332 | |
333 | INIT_G(); |
334 | /* Set default values */ |
335 | user = "anonymous"; |
336 | password = "busybox@"; |
337 | |
338 | /* |
339 | * Decipher the command line |
340 | */ |
341 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS |
342 | applet_long_options = ftpgetput_longopts; |
343 | #endif |
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); |
347 | argv += optind; |
348 | |
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)); |
353 | if (verbose_flag) { |
354 | printf("Connecting to %s (%s)\n", argv[0], |
355 | xmalloc_sockaddr2dotted(&lsa->u.sa)); |
356 | } |
357 | |
358 | ftp_login(); |
359 | return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]); |
360 | } |
361 |