| 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 | #include "common_bufsiz.h"
|
|---|
| 54 |
|
|---|
| 55 | struct globals {
|
|---|
| 56 | const char *user;
|
|---|
| 57 | const char *password;
|
|---|
| 58 | struct len_and_sockaddr *lsa;
|
|---|
| 59 | FILE *control_stream;
|
|---|
| 60 | int verbose_flag;
|
|---|
| 61 | int do_continue;
|
|---|
| 62 | char buf[4]; /* actually [BUFSZ] */
|
|---|
| 63 | } FIX_ALIASING;
|
|---|
| 64 | #define G (*(struct globals*)bb_common_bufsiz1)
|
|---|
| 65 | enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
|
|---|
| 66 | #define user (G.user )
|
|---|
| 67 | #define password (G.password )
|
|---|
| 68 | #define lsa (G.lsa )
|
|---|
| 69 | #define control_stream (G.control_stream)
|
|---|
| 70 | #define verbose_flag (G.verbose_flag )
|
|---|
| 71 | #define do_continue (G.do_continue )
|
|---|
| 72 | #define buf (G.buf )
|
|---|
| 73 | #define INIT_G() do { \
|
|---|
| 74 | setup_common_bufsiz(); \
|
|---|
| 75 | BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
|
|---|
| 76 | } while (0)
|
|---|
| 77 |
|
|---|
| 78 |
|
|---|
| 79 | static void ftp_die(const char *msg) NORETURN;
|
|---|
| 80 | static void ftp_die(const char *msg)
|
|---|
| 81 | {
|
|---|
| 82 | char *cp = buf; /* buf holds peer's response */
|
|---|
| 83 |
|
|---|
| 84 | /* Guard against garbage from remote server */
|
|---|
| 85 | while (*cp >= ' ' && *cp < '\x7f')
|
|---|
| 86 | cp++;
|
|---|
| 87 | *cp = '\0';
|
|---|
| 88 | bb_error_msg_and_die("unexpected server response%s%s: %s",
|
|---|
| 89 | (msg ? " to " : ""), (msg ? msg : ""), buf);
|
|---|
| 90 | }
|
|---|
| 91 |
|
|---|
| 92 | static int ftpcmd(const char *s1, const char *s2)
|
|---|
| 93 | {
|
|---|
| 94 | unsigned n;
|
|---|
| 95 |
|
|---|
| 96 | if (verbose_flag) {
|
|---|
| 97 | bb_error_msg("cmd %s %s", s1, s2);
|
|---|
| 98 | }
|
|---|
| 99 |
|
|---|
| 100 | if (s1) {
|
|---|
| 101 | fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
|
|---|
| 102 | s1, s2);
|
|---|
| 103 | fflush(control_stream);
|
|---|
| 104 | }
|
|---|
| 105 |
|
|---|
| 106 | do {
|
|---|
| 107 | strcpy(buf, "EOF"); /* for ftp_die */
|
|---|
| 108 | if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
|
|---|
| 109 | ftp_die(NULL);
|
|---|
| 110 | }
|
|---|
| 111 | } while (!isdigit(buf[0]) || buf[3] != ' ');
|
|---|
| 112 |
|
|---|
| 113 | buf[3] = '\0';
|
|---|
| 114 | n = xatou(buf);
|
|---|
| 115 | buf[3] = ' ';
|
|---|
| 116 | return n;
|
|---|
| 117 | }
|
|---|
| 118 |
|
|---|
| 119 | static void ftp_login(void)
|
|---|
| 120 | {
|
|---|
| 121 | /* Connect to the command socket */
|
|---|
| 122 | control_stream = fdopen(xconnect_stream(lsa), "r+");
|
|---|
| 123 | if (control_stream == NULL) {
|
|---|
| 124 | /* fdopen failed - extremely unlikely */
|
|---|
| 125 | bb_perror_nomsg_and_die();
|
|---|
| 126 | }
|
|---|
| 127 |
|
|---|
| 128 | if (ftpcmd(NULL, NULL) != 220) {
|
|---|
| 129 | ftp_die(NULL);
|
|---|
| 130 | }
|
|---|
| 131 |
|
|---|
| 132 | /* Login to the server */
|
|---|
| 133 | switch (ftpcmd("USER", user)) {
|
|---|
| 134 | case 230:
|
|---|
| 135 | break;
|
|---|
| 136 | case 331:
|
|---|
| 137 | if (ftpcmd("PASS", password) != 230) {
|
|---|
| 138 | ftp_die("PASS");
|
|---|
| 139 | }
|
|---|
| 140 | break;
|
|---|
| 141 | default:
|
|---|
| 142 | ftp_die("USER");
|
|---|
| 143 | }
|
|---|
| 144 |
|
|---|
| 145 | ftpcmd("TYPE I", NULL);
|
|---|
| 146 | }
|
|---|
| 147 |
|
|---|
| 148 | static int xconnect_ftpdata(void)
|
|---|
| 149 | {
|
|---|
| 150 | char *buf_ptr;
|
|---|
| 151 | unsigned port_num;
|
|---|
| 152 |
|
|---|
| 153 | /*
|
|---|
| 154 | TODO: PASV command will not work for IPv6. RFC2428 describes
|
|---|
| 155 | IPv6-capable "extended PASV" - EPSV.
|
|---|
| 156 |
|
|---|
| 157 | "EPSV [protocol]" asks server to bind to and listen on a data port
|
|---|
| 158 | in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
|
|---|
| 159 | If not specified, defaults to "same as used for control connection".
|
|---|
| 160 | If server understood you, it should answer "229 <some text>(|||port|)"
|
|---|
| 161 | where "|" are literal pipe chars and "port" is ASCII decimal port#.
|
|---|
| 162 |
|
|---|
| 163 | There is also an IPv6-capable replacement for PORT (EPRT),
|
|---|
| 164 | but we don't need that.
|
|---|
| 165 |
|
|---|
| 166 | NB: PASV may still work for some servers even over IPv6.
|
|---|
| 167 | For example, vsftp happily answers
|
|---|
| 168 | "227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
|
|---|
| 169 |
|
|---|
| 170 | TODO2: need to stop ignoring IP address in PASV response.
|
|---|
| 171 | */
|
|---|
| 172 |
|
|---|
| 173 | if (ftpcmd("PASV", NULL) != 227) {
|
|---|
| 174 | ftp_die("PASV");
|
|---|
| 175 | }
|
|---|
| 176 |
|
|---|
| 177 | /* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
|
|---|
| 178 | * Server's IP is N1.N2.N3.N4 (we ignore it)
|
|---|
| 179 | * Server's port for data connection is P1*256+P2 */
|
|---|
| 180 | buf_ptr = strrchr(buf, ')');
|
|---|
| 181 | if (buf_ptr) *buf_ptr = '\0';
|
|---|
| 182 |
|
|---|
| 183 | buf_ptr = strrchr(buf, ',');
|
|---|
| 184 | *buf_ptr = '\0';
|
|---|
| 185 | port_num = xatoul_range(buf_ptr + 1, 0, 255);
|
|---|
| 186 |
|
|---|
| 187 | buf_ptr = strrchr(buf, ',');
|
|---|
| 188 | *buf_ptr = '\0';
|
|---|
| 189 | port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
|
|---|
| 190 |
|
|---|
| 191 | set_nport(&lsa->u.sa, htons(port_num));
|
|---|
| 192 | return xconnect_stream(lsa);
|
|---|
| 193 | }
|
|---|
| 194 |
|
|---|
| 195 | static int pump_data_and_QUIT(int from, int to)
|
|---|
| 196 | {
|
|---|
| 197 | /* copy the file */
|
|---|
| 198 | if (bb_copyfd_eof(from, to) == -1) {
|
|---|
| 199 | /* error msg is already printed by bb_copyfd_eof */
|
|---|
| 200 | return EXIT_FAILURE;
|
|---|
| 201 | }
|
|---|
| 202 |
|
|---|
| 203 | /* close data connection */
|
|---|
| 204 | close(from); /* don't know which one is that, so we close both */
|
|---|
| 205 | close(to);
|
|---|
| 206 |
|
|---|
| 207 | /* does server confirm that transfer is finished? */
|
|---|
| 208 | if (ftpcmd(NULL, NULL) != 226) {
|
|---|
| 209 | ftp_die(NULL);
|
|---|
| 210 | }
|
|---|
| 211 | ftpcmd("QUIT", NULL);
|
|---|
| 212 |
|
|---|
| 213 | return EXIT_SUCCESS;
|
|---|
| 214 | }
|
|---|
| 215 |
|
|---|
| 216 | #if !ENABLE_FTPGET
|
|---|
| 217 | int ftp_receive(const char *local_path, char *server_path);
|
|---|
| 218 | #else
|
|---|
| 219 | static
|
|---|
| 220 | int ftp_receive(const char *local_path, char *server_path)
|
|---|
| 221 | {
|
|---|
| 222 | int fd_data;
|
|---|
| 223 | int fd_local = -1;
|
|---|
| 224 | off_t beg_range = 0;
|
|---|
| 225 |
|
|---|
| 226 | /* connect to the data socket */
|
|---|
| 227 | fd_data = xconnect_ftpdata();
|
|---|
| 228 |
|
|---|
| 229 | if (ftpcmd("SIZE", server_path) != 213) {
|
|---|
| 230 | do_continue = 0;
|
|---|
| 231 | }
|
|---|
| 232 |
|
|---|
| 233 | if (LONE_DASH(local_path)) {
|
|---|
| 234 | fd_local = STDOUT_FILENO;
|
|---|
| 235 | do_continue = 0;
|
|---|
| 236 | }
|
|---|
| 237 |
|
|---|
| 238 | if (do_continue) {
|
|---|
| 239 | struct stat sbuf;
|
|---|
| 240 | /* lstat would be wrong here! */
|
|---|
| 241 | if (stat(local_path, &sbuf) < 0) {
|
|---|
| 242 | bb_perror_msg_and_die("stat");
|
|---|
| 243 | }
|
|---|
| 244 | if (sbuf.st_size > 0) {
|
|---|
| 245 | beg_range = sbuf.st_size;
|
|---|
| 246 | } else {
|
|---|
| 247 | do_continue = 0;
|
|---|
| 248 | }
|
|---|
| 249 | }
|
|---|
| 250 |
|
|---|
| 251 | if (do_continue) {
|
|---|
| 252 | sprintf(buf, "REST %"OFF_FMT"u", beg_range);
|
|---|
| 253 | if (ftpcmd(buf, NULL) != 350) {
|
|---|
| 254 | do_continue = 0;
|
|---|
| 255 | }
|
|---|
| 256 | }
|
|---|
| 257 |
|
|---|
| 258 | if (ftpcmd("RETR", server_path) > 150) {
|
|---|
| 259 | ftp_die("RETR");
|
|---|
| 260 | }
|
|---|
| 261 |
|
|---|
| 262 | /* create local file _after_ we know that remote file exists */
|
|---|
| 263 | if (fd_local == -1) {
|
|---|
| 264 | fd_local = xopen(local_path,
|
|---|
| 265 | do_continue ? (O_APPEND | O_WRONLY)
|
|---|
| 266 | : (O_CREAT | O_TRUNC | O_WRONLY)
|
|---|
| 267 | );
|
|---|
| 268 | }
|
|---|
| 269 |
|
|---|
| 270 | return pump_data_and_QUIT(fd_data, fd_local);
|
|---|
| 271 | }
|
|---|
| 272 | #endif
|
|---|
| 273 |
|
|---|
| 274 | #if !ENABLE_FTPPUT
|
|---|
| 275 | int ftp_send(const char *server_path, char *local_path);
|
|---|
| 276 | #else
|
|---|
| 277 | static
|
|---|
| 278 | int ftp_send(const char *server_path, char *local_path)
|
|---|
| 279 | {
|
|---|
| 280 | int fd_data;
|
|---|
| 281 | int fd_local;
|
|---|
| 282 | int response;
|
|---|
| 283 |
|
|---|
| 284 | /* connect to the data socket */
|
|---|
| 285 | fd_data = xconnect_ftpdata();
|
|---|
| 286 |
|
|---|
| 287 | /* get the local file */
|
|---|
| 288 | fd_local = STDIN_FILENO;
|
|---|
| 289 | if (NOT_LONE_DASH(local_path))
|
|---|
| 290 | fd_local = xopen(local_path, O_RDONLY);
|
|---|
| 291 |
|
|---|
| 292 | response = ftpcmd("STOR", server_path);
|
|---|
| 293 | switch (response) {
|
|---|
| 294 | case 125:
|
|---|
| 295 | case 150:
|
|---|
| 296 | break;
|
|---|
| 297 | default:
|
|---|
| 298 | ftp_die("STOR");
|
|---|
| 299 | }
|
|---|
| 300 |
|
|---|
| 301 | return pump_data_and_QUIT(fd_local, fd_data);
|
|---|
| 302 | }
|
|---|
| 303 | #endif
|
|---|
| 304 |
|
|---|
| 305 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
|
|---|
| 306 | static const char ftpgetput_longopts[] ALIGN1 =
|
|---|
| 307 | "continue\0" Required_argument "c"
|
|---|
| 308 | "verbose\0" No_argument "v"
|
|---|
| 309 | "username\0" Required_argument "u"
|
|---|
| 310 | "password\0" Required_argument "p"
|
|---|
| 311 | "port\0" Required_argument "P"
|
|---|
| 312 | ;
|
|---|
| 313 | #endif
|
|---|
| 314 |
|
|---|
| 315 | int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 316 | int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 317 | {
|
|---|
| 318 | const char *port = "ftp";
|
|---|
| 319 | /* socket to ftp server */
|
|---|
| 320 |
|
|---|
| 321 | #if ENABLE_FTPPUT && !ENABLE_FTPGET
|
|---|
| 322 | # define ftp_action ftp_send
|
|---|
| 323 | #elif ENABLE_FTPGET && !ENABLE_FTPPUT
|
|---|
| 324 | # define ftp_action ftp_receive
|
|---|
| 325 | #else
|
|---|
| 326 | int (*ftp_action)(const char *, char *) = ftp_send;
|
|---|
| 327 |
|
|---|
| 328 | /* Check to see if the command is ftpget or ftput */
|
|---|
| 329 | if (applet_name[3] == 'g') {
|
|---|
| 330 | ftp_action = ftp_receive;
|
|---|
| 331 | }
|
|---|
| 332 | #endif
|
|---|
| 333 |
|
|---|
| 334 | INIT_G();
|
|---|
| 335 | /* Set default values */
|
|---|
| 336 | user = "anonymous";
|
|---|
| 337 | password = "busybox@";
|
|---|
| 338 |
|
|---|
| 339 | /*
|
|---|
| 340 | * Decipher the command line
|
|---|
| 341 | */
|
|---|
| 342 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
|
|---|
| 343 | applet_long_options = ftpgetput_longopts;
|
|---|
| 344 | #endif
|
|---|
| 345 | opt_complementary = "-2:vv:cc"; /* must have 2 to 3 params; -v and -c count */
|
|---|
| 346 | getopt32(argv, "cvu:p:P:", &user, &password, &port,
|
|---|
| 347 | &verbose_flag, &do_continue);
|
|---|
| 348 | argv += optind;
|
|---|
| 349 |
|
|---|
| 350 | /* We want to do exactly _one_ DNS lookup, since some
|
|---|
| 351 | * sites (i.e. ftp.us.debian.org) use round-robin DNS
|
|---|
| 352 | * and we want to connect to only one IP... */
|
|---|
| 353 | lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
|
|---|
| 354 | if (verbose_flag) {
|
|---|
| 355 | printf("Connecting to %s (%s)\n", argv[0],
|
|---|
| 356 | xmalloc_sockaddr2dotted(&lsa->u.sa));
|
|---|
| 357 | }
|
|---|
| 358 |
|
|---|
| 359 | ftp_login();
|
|---|
| 360 | return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);
|
|---|
| 361 | }
|
|---|
