aboutsummaryrefslogtreecommitdiff
path: root/networking/ftpgetput.c
blob: a1ee054263cc79d6e89480cf56291d18392213a9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
/* vi: set sw=4 ts=4: */
/*
 * ftpget
 *
 * Mini implementation of FTP to retrieve a remote file.
 *
 * Copyright (C) 2002 Jeff Angielski, The PTR Group <jeff@theptrgroup.com>
 * Copyright (C) 2002 Glenn McGrath
 *
 * Based on wget.c by Chip Rosenthal Covad Communications
 * <chip@laserlink.net>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

typedef struct ftp_host_info_s {
	const char *user;
	const char *password;
	struct len_and_sockaddr *lsa;
} ftp_host_info_t;

static smallint verbose_flag;
static smallint do_continue;

static void ftp_die(const char *msg, const char *remote) ATTRIBUTE_NORETURN;
static void ftp_die(const char *msg, const char *remote)
{
	/* Guard against garbage from remote server */
	const char *cp = remote;
	while (*cp >= ' ' && *cp < '\x7f') cp++;
	bb_error_msg_and_die("unexpected server response%s%s: %.*s",
			msg ? " to " : "", msg ? msg : "",
			(int)(cp - remote), remote);
}


static int ftpcmd(const char *s1, const char *s2, FILE *stream, char *buf)
{
	unsigned n;
	if (verbose_flag) {
		bb_error_msg("cmd %s %s", s1, s2);
	}

	if (s1) {
		if (s2) {
			fprintf(stream, "%s %s\r\n", s1, s2);
		} else {
			fprintf(stream, "%s\r\n", s1);
		}
	}
	do {
		char *buf_ptr;

		if (fgets(buf, 510, stream) == NULL) {
			bb_perror_msg_and_die("fgets");
		}
		buf_ptr = strstr(buf, "\r\n");
		if (buf_ptr) {
			*buf_ptr = '\0';
		}
	} while (!isdigit(buf[0]) || buf[3] != ' ');

	buf[3] = '\0';
	n = xatou(buf);
	buf[3] = ' ';
	return n;
}

static int xconnect_ftpdata(ftp_host_info_t *server, char *buf)
{
	char *buf_ptr;
	unsigned port_num;

	/* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
	 * Server's IP is N1.N2.N3.N4 (we ignore it)
	 * Server's port for data connection is P1*256+P2 */
	buf_ptr = strrchr(buf, ')');
	if (buf_ptr) *buf_ptr = '\0';

	buf_ptr = strrchr(buf, ',');
	*buf_ptr = '\0';
	port_num = xatoul_range(buf_ptr + 1, 0, 255);

	buf_ptr = strrchr(buf, ',');
	*buf_ptr = '\0';
	port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;

	set_nport(server->lsa, htons(port_num));
	return xconnect_stream(server->lsa);
}

static FILE *ftp_login(ftp_host_info_t *server)
{
	FILE *control_stream;
	char buf[512];

	/* Connect to the command socket */
	control_stream = fdopen(xconnect_stream(server->lsa), "r+");
	if (control_stream == NULL) {
		/* fdopen failed - extremely unlikely */
		bb_perror_nomsg_and_die();
	}

	if (ftpcmd(NULL, NULL, control_stream, buf) != 220) {
		ftp_die(NULL, buf);
	}

	/*  Login to the server */
	switch (ftpcmd("USER", server->user, control_stream, buf)) {
	case 230:
		break;
	case 331:
		if (ftpcmd("PASS", server->password, control_stream, buf) != 230) {
			ftp_die("PASS", buf);
		}
		break;
	default:
		ftp_die("USER", buf);
	}

	ftpcmd("TYPE I", NULL, control_stream, buf);

	return control_stream;
}

#if !ENABLE_FTPGET
int ftp_receive(ftp_host_info_t *server, FILE *control_stream,
		const char *local_path, char *server_path);
#else
static
int ftp_receive(ftp_host_info_t *server, FILE *control_stream,
		const char *local_path, char *server_path)
{
	char buf[512];
/* I think 'filesize' usage here is bogus. Let's see... */
	//off_t filesize = -1;
#define filesize ((off_t)-1)
	int fd_data;
	int fd_local = -1;
	off_t beg_range = 0;

	/* Connect to the data socket */
	if (ftpcmd("PASV", NULL, control_stream, buf) != 227) {
		ftp_die("PASV", buf);
	}
	fd_data = xconnect_ftpdata(server, buf);

	if (ftpcmd("SIZE", server_path, control_stream, buf) == 213) {
		//filesize = BB_STRTOOFF(buf + 4, NULL, 10);
		//if (errno || filesize < 0)
		//	ftp_die("SIZE", buf);
	} else {
		do_continue = 0;
	}

	if (LONE_DASH(local_path)) {
		fd_local = STDOUT_FILENO;
		do_continue = 0;
	}

	if (do_continue) {
		struct stat sbuf;
		if (lstat(local_path, &sbuf) < 0) {
			bb_perror_msg_and_die("lstat");
		}
		if (sbuf.st_size > 0) {
			beg_range = sbuf.st_size;
		} else {
			do_continue = 0;
		}
	}

	if (do_continue) {
		sprintf(buf, "REST %"OFF_FMT"d", beg_range);
		if (ftpcmd(buf, NULL, control_stream, buf) != 350) {
			do_continue = 0;
		} else {
			//if (filesize != -1)
			//	filesize -= beg_range;
		}
	}

	if (ftpcmd("RETR", server_path, control_stream, buf) > 150) {
		ftp_die("RETR", buf);
	}

	/* only make a local file if we know that one exists on the remote server */
	if (fd_local == -1) {
		if (do_continue) {
			fd_local = xopen(local_path, O_APPEND | O_WRONLY);
		} else {
			fd_local = xopen(local_path, O_CREAT | O_TRUNC | O_WRONLY);
		}
	}

	/* Copy the file */
	if (filesize != -1) {
		if (bb_copyfd_size(fd_data, fd_local, filesize) == -1)
			return EXIT_FAILURE;
	} else {
		if (bb_copyfd_eof(fd_data, fd_local) == -1)
			return EXIT_FAILURE;
	}

	/* close it all down */
	close(fd_data);
	if (ftpcmd(NULL, NULL, control_stream, buf) != 226) {
		ftp_die(NULL, buf);
	}
	ftpcmd("QUIT", NULL, control_stream, buf);

	return EXIT_SUCCESS;
}
#endif

#if !ENABLE_FTPPUT
int ftp_send(ftp_host_info_t *server, FILE *control_stream,
		const char *server_path, char *local_path);
#else
static
int ftp_send(ftp_host_info_t *server, FILE *control_stream,
		const char *server_path, char *local_path)
{
	struct stat sbuf;
	char buf[512];
	int fd_data;
	int fd_local;
	int response;

	/*  Connect to the data socket */
	if (ftpcmd("PASV", NULL, control_stream, buf) != 227) {
		ftp_die("PASV", buf);
	}
	fd_data = xconnect_ftpdata(server, buf);

	/* get the local file */
	fd_local = STDIN_FILENO;
	if (NOT_LONE_DASH(local_path)) {
		fd_local = xopen(local_path, O_RDONLY);
		fstat(fd_local, &sbuf);

		sprintf(buf, "ALLO %"OFF_FMT"u", sbuf.st_size);
		response = ftpcmd(buf, NULL, control_stream, buf);
		switch (response) {
		case 200:
		case 202:
			break;
		default:
			close(fd_local);
			ftp_die("ALLO", buf);
			break;
		}
	}
	response = ftpcmd("STOR", server_path, control_stream, buf);
	switch (response) {
	case 125:
	case 150:
		break;
	default:
		close(fd_local);
		ftp_die("STOR", buf);
	}

	/* transfer the file  */
	if (bb_copyfd_eof(fd_local, fd_data) == -1) {
		exit(EXIT_FAILURE);
	}

	/* close it all down */
	close(fd_data);
	if (ftpcmd(NULL, NULL, control_stream, buf) != 226) {
		ftp_die("close", buf);
	}
	ftpcmd("QUIT", NULL, control_stream, buf);

	return EXIT_SUCCESS;
}
#endif

#define FTPGETPUT_OPT_CONTINUE	1
#define FTPGETPUT_OPT_VERBOSE	2
#define FTPGETPUT_OPT_USER	4
#define FTPGETPUT_OPT_PASSWORD	8
#define FTPGETPUT_OPT_PORT	16

#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
static const char ftpgetput_longopts[] ALIGN1 =
	"continue\0" Required_argument "c"
	"verbose\0"  No_argument       "v"
	"username\0" Required_argument "u"
	"password\0" Required_argument "p"
	"port\0"     Required_argument "P"
	;
#endif

int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ftpgetput_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
	/* content-length of the file */
	unsigned opt;
	const char *port = "ftp";
	/* socket to ftp server */
	FILE *control_stream;
	/* continue previous transfer (-c) */
	ftp_host_info_t *server;

#if ENABLE_FTPPUT && !ENABLE_FTPGET
# define ftp_action ftp_send
#elif ENABLE_FTPGET && !ENABLE_FTPPUT
# define ftp_action ftp_receive
#else
	int (*ftp_action)(ftp_host_info_t *, FILE *, const char *, char *) = ftp_send;
	/* Check to see if the command is ftpget or ftput */
	if (applet_name[3] == 'g') {
		ftp_action = ftp_receive;
	}
#endif

	/* Set default values */
	server = xmalloc(sizeof(*server));
	server->user = "anonymous";
	server->password = "busybox@";

	/*
	 * Decipher the command line
	 */
#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
	applet_long_options = ftpgetput_longopts;
#endif
	opt_complementary = "=3"; /* must have 3 params */
	opt = getopt32(argv, "cvu:p:P:", &server->user, &server->password, &port);
	argv += optind;

	/* Process the non-option command line arguments */
	if (opt & FTPGETPUT_OPT_CONTINUE) {
		do_continue = 1;
	}
	if (opt & FTPGETPUT_OPT_VERBOSE) {
		verbose_flag = 1;
	}

	/* We want to do exactly _one_ DNS lookup, since some
	 * sites (i.e. ftp.us.debian.org) use round-robin DNS
	 * and we want to connect to only one IP... */
	server->lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
	if (verbose_flag) {
		printf("Connecting to %s (%s)\n", argv[0],
			xmalloc_sockaddr2dotted(&server->lsa->u.sa));
	}

	/*  Connect/Setup/Configure the FTP session */
	control_stream = ftp_login(server);

	return ftp_action(server, control_stream, argv[1], argv[2]);
}