Contents of /tags/mkinitrd-6_1_1/busybox/networking/ftpgetput.c
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 16:31:54 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 7543 byte(s)
tagged 'mkinitrd-6_1_1'
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 tarball for details. |
14 | */ |
15 | |
16 | #include "libbb.h" |
17 | |
18 | struct globals { |
19 | const char *user; |
20 | const char *password; |
21 | struct len_and_sockaddr *lsa; |
22 | FILE *control_stream; |
23 | int verbose_flag; |
24 | int do_continue; |
25 | char buf[1]; /* actually [BUFSZ] */ |
26 | }; |
27 | #define G (*(struct globals*)&bb_common_bufsiz1) |
28 | enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) }; |
29 | struct BUG_G_too_big { |
30 | char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1]; |
31 | }; |
32 | #define user (G.user ) |
33 | #define password (G.password ) |
34 | #define lsa (G.lsa ) |
35 | #define control_stream (G.control_stream) |
36 | #define verbose_flag (G.verbose_flag ) |
37 | #define do_continue (G.do_continue ) |
38 | #define buf (G.buf ) |
39 | #define INIT_G() do { } while (0) |
40 | |
41 | |
42 | static void ftp_die(const char *msg) NORETURN; |
43 | static void ftp_die(const char *msg) |
44 | { |
45 | char *cp = buf; /* buf holds peer's response */ |
46 | |
47 | /* Guard against garbage from remote server */ |
48 | while (*cp >= ' ' && *cp < '\x7f') |
49 | cp++; |
50 | *cp = '\0'; |
51 | bb_error_msg_and_die("unexpected server response%s%s: %s", |
52 | (msg ? " to " : ""), (msg ? msg : ""), buf); |
53 | } |
54 | |
55 | static int ftpcmd(const char *s1, const char *s2) |
56 | { |
57 | unsigned n; |
58 | |
59 | if (verbose_flag) { |
60 | bb_error_msg("cmd %s %s", s1, s2); |
61 | } |
62 | |
63 | if (s1) { |
64 | fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3), |
65 | s1, s2); |
66 | fflush(control_stream); |
67 | } |
68 | |
69 | do { |
70 | strcpy(buf, "EOF"); |
71 | if (fgets(buf, BUFSZ - 2, control_stream) == NULL) { |
72 | ftp_die(NULL); |
73 | } |
74 | } while (!isdigit(buf[0]) || buf[3] != ' '); |
75 | |
76 | buf[3] = '\0'; |
77 | n = xatou(buf); |
78 | buf[3] = ' '; |
79 | return n; |
80 | } |
81 | |
82 | static void ftp_login(void) |
83 | { |
84 | /* Connect to the command socket */ |
85 | control_stream = fdopen(xconnect_stream(lsa), "r+"); |
86 | if (control_stream == NULL) { |
87 | /* fdopen failed - extremely unlikely */ |
88 | bb_perror_nomsg_and_die(); |
89 | } |
90 | |
91 | if (ftpcmd(NULL, NULL) != 220) { |
92 | ftp_die(NULL); |
93 | } |
94 | |
95 | /* Login to the server */ |
96 | switch (ftpcmd("USER", user)) { |
97 | case 230: |
98 | break; |
99 | case 331: |
100 | if (ftpcmd("PASS", password) != 230) { |
101 | ftp_die("PASS"); |
102 | } |
103 | break; |
104 | default: |
105 | ftp_die("USER"); |
106 | } |
107 | |
108 | ftpcmd("TYPE I", NULL); |
109 | } |
110 | |
111 | static int xconnect_ftpdata(void) |
112 | { |
113 | char *buf_ptr; |
114 | unsigned port_num; |
115 | |
116 | /* |
117 | TODO: PASV command will not work for IPv6. RFC2428 describes |
118 | IPv6-capable "extended PASV" - EPSV. |
119 | |
120 | "EPSV [protocol]" asks server to bind to and listen on a data port |
121 | in specified protocol. Protocol is 1 for IPv4, 2 for IPv6. |
122 | If not specified, defaults to "same as used for control connection". |
123 | If server understood you, it should answer "229 <some text>(|||port|)" |
124 | where "|" are literal pipe chars and "port" is ASCII decimal port#. |
125 | |
126 | There is also an IPv6-capable replacement for PORT (EPRT), |
127 | but we don't need that. |
128 | |
129 | NB: PASV may still work for some servers even over IPv6. |
130 | For example, vsftp happily answers |
131 | "227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual. |
132 | |
133 | TODO2: need to stop ignoring IP address in PASV response. |
134 | */ |
135 | |
136 | if (ftpcmd("PASV", NULL) != 227) { |
137 | ftp_die("PASV"); |
138 | } |
139 | |
140 | /* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage] |
141 | * Server's IP is N1.N2.N3.N4 (we ignore it) |
142 | * Server's port for data connection is P1*256+P2 */ |
143 | buf_ptr = strrchr(buf, ')'); |
144 | if (buf_ptr) *buf_ptr = '\0'; |
145 | |
146 | buf_ptr = strrchr(buf, ','); |
147 | *buf_ptr = '\0'; |
148 | port_num = xatoul_range(buf_ptr + 1, 0, 255); |
149 | |
150 | buf_ptr = strrchr(buf, ','); |
151 | *buf_ptr = '\0'; |
152 | port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256; |
153 | |
154 | set_nport(lsa, htons(port_num)); |
155 | return xconnect_stream(lsa); |
156 | } |
157 | |
158 | static int pump_data_and_QUIT(int from, int to) |
159 | { |
160 | /* copy the file */ |
161 | if (bb_copyfd_eof(from, to) == -1) { |
162 | /* error msg is already printed by bb_copyfd_eof */ |
163 | return EXIT_FAILURE; |
164 | } |
165 | |
166 | /* close data connection */ |
167 | close(from); /* don't know which one is that, so we close both */ |
168 | close(to); |
169 | |
170 | /* does server confirm that transfer is finished? */ |
171 | if (ftpcmd(NULL, NULL) != 226) { |
172 | ftp_die(NULL); |
173 | } |
174 | ftpcmd("QUIT", NULL); |
175 | |
176 | return EXIT_SUCCESS; |
177 | } |
178 | |
179 | #if !ENABLE_FTPGET |
180 | int ftp_receive(const char *local_path, char *server_path); |
181 | #else |
182 | static |
183 | int ftp_receive(const char *local_path, char *server_path) |
184 | { |
185 | int fd_data; |
186 | int fd_local = -1; |
187 | off_t beg_range = 0; |
188 | |
189 | /* connect to the data socket */ |
190 | fd_data = xconnect_ftpdata(); |
191 | |
192 | if (ftpcmd("SIZE", server_path) != 213) { |
193 | do_continue = 0; |
194 | } |
195 | |
196 | if (LONE_DASH(local_path)) { |
197 | fd_local = STDOUT_FILENO; |
198 | do_continue = 0; |
199 | } |
200 | |
201 | if (do_continue) { |
202 | struct stat sbuf; |
203 | /* lstat would be wrong here! */ |
204 | if (stat(local_path, &sbuf) < 0) { |
205 | bb_perror_msg_and_die("stat"); |
206 | } |
207 | if (sbuf.st_size > 0) { |
208 | beg_range = sbuf.st_size; |
209 | } else { |
210 | do_continue = 0; |
211 | } |
212 | } |
213 | |
214 | if (do_continue) { |
215 | sprintf(buf, "REST %"OFF_FMT"d", beg_range); |
216 | if (ftpcmd(buf, NULL) != 350) { |
217 | do_continue = 0; |
218 | } |
219 | } |
220 | |
221 | if (ftpcmd("RETR", server_path) > 150) { |
222 | ftp_die("RETR"); |
223 | } |
224 | |
225 | /* create local file _after_ we know that remote file exists */ |
226 | if (fd_local == -1) { |
227 | fd_local = xopen(local_path, |
228 | do_continue ? (O_APPEND | O_WRONLY) |
229 | : (O_CREAT | O_TRUNC | O_WRONLY) |
230 | ); |
231 | } |
232 | |
233 | return pump_data_and_QUIT(fd_data, fd_local); |
234 | } |
235 | #endif |
236 | |
237 | #if !ENABLE_FTPPUT |
238 | int ftp_send(const char *server_path, char *local_path); |
239 | #else |
240 | static |
241 | int ftp_send(const char *server_path, char *local_path) |
242 | { |
243 | int fd_data; |
244 | int fd_local; |
245 | int response; |
246 | |
247 | /* connect to the data socket */ |
248 | fd_data = xconnect_ftpdata(); |
249 | |
250 | /* get the local file */ |
251 | fd_local = STDIN_FILENO; |
252 | if (NOT_LONE_DASH(local_path)) |
253 | fd_local = xopen(local_path, O_RDONLY); |
254 | |
255 | response = ftpcmd("STOR", server_path); |
256 | switch (response) { |
257 | case 125: |
258 | case 150: |
259 | break; |
260 | default: |
261 | ftp_die("STOR"); |
262 | } |
263 | |
264 | return pump_data_and_QUIT(fd_local, fd_data); |
265 | } |
266 | #endif |
267 | |
268 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS |
269 | static const char ftpgetput_longopts[] ALIGN1 = |
270 | "continue\0" Required_argument "c" |
271 | "verbose\0" No_argument "v" |
272 | "username\0" Required_argument "u" |
273 | "password\0" Required_argument "p" |
274 | "port\0" Required_argument "P" |
275 | ; |
276 | #endif |
277 | |
278 | int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
279 | int ftpgetput_main(int argc UNUSED_PARAM, char **argv) |
280 | { |
281 | unsigned opt; |
282 | const char *port = "ftp"; |
283 | /* socket to ftp server */ |
284 | |
285 | #if ENABLE_FTPPUT && !ENABLE_FTPGET |
286 | # define ftp_action ftp_send |
287 | #elif ENABLE_FTPGET && !ENABLE_FTPPUT |
288 | # define ftp_action ftp_receive |
289 | #else |
290 | int (*ftp_action)(const char *, char *) = ftp_send; |
291 | |
292 | /* Check to see if the command is ftpget or ftput */ |
293 | if (applet_name[3] == 'g') { |
294 | ftp_action = ftp_receive; |
295 | } |
296 | #endif |
297 | |
298 | INIT_G(); |
299 | /* Set default values */ |
300 | user = "anonymous"; |
301 | password = "busybox@"; |
302 | |
303 | /* |
304 | * Decipher the command line |
305 | */ |
306 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS |
307 | applet_long_options = ftpgetput_longopts; |
308 | #endif |
309 | opt_complementary = "=3:vv:cc"; /* must have 3 params; -v and -c count */ |
310 | opt = getopt32(argv, "cvu:p:P:", &user, &password, &port, |
311 | &verbose_flag, &do_continue); |
312 | argv += optind; |
313 | |
314 | /* We want to do exactly _one_ DNS lookup, since some |
315 | * sites (i.e. ftp.us.debian.org) use round-robin DNS |
316 | * and we want to connect to only one IP... */ |
317 | lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21)); |
318 | if (verbose_flag) { |
319 | printf("Connecting to %s (%s)\n", argv[0], |
320 | xmalloc_sockaddr2dotted(&lsa->u.sa)); |
321 | } |
322 | |
323 | ftp_login(); |
324 | return ftp_action(argv[1], argv[2]); |
325 | } |