LXR busybox/networking/ftpgetput.c

   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 (7.8 kb)"
  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 (7.5 kb)"
  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
  32//applet:IF_FTPGET(APPLET_ODDNAME(ftpget, ftpgetput, BB_DIR_USR_BIN, BB_SUID_DROP, ftpget))
  33//applet:IF_FTPPUT(APPLET_ODDNAME(ftpput, ftpgetput, BB_DIR_USR_BIN, BB_SUID_DROP, ftpput))
  34
  35//kbuild:lib-$(CONFIG_FTPGET) += ftpgetput.o
  36//kbuild:lib-$(CONFIG_FTPPUT) += ftpgetput.o
  37
  38//usage:#define ftpget_trivial_usage
  39//usage:       "[OPTIONS] HOST [LOCAL_FILE] REMOTE_FILE"
  40//usage:#define ftpget_full_usage "\n\n"
  41//usage:       "Download a file via FTP\n"
  42//usage:     "\n        -c      Continue previous transfer"
  43//usage:     "\n        -v      Verbose"
  44//usage:     "\n        -u USER Username"
  45//usage:     "\n        -p PASS Password"
  46//usage:     "\n        -P NUM  Port"
  47//usage:
  48//usage:#define ftpput_trivial_usage
  49//usage:       "[OPTIONS] HOST [REMOTE_FILE] LOCAL_FILE"
  50//usage:#define ftpput_full_usage "\n\n"
  51//usage:       "Upload a file to a FTP server\n"
  52//usage:     "\n        -v      Verbose"
  53//usage:     "\n        -u USER Username"
  54//usage:     "\n        -p PASS Password"
  55//usage:     "\n        -P NUM  Port number"
  56
  57#include "libbb.h"
  58#include "common_bufsiz.h"
  59
  60struct globals {
  61        const char *user;
  62        const char *password;
  63        struct len_and_sockaddr *lsa;
  64        FILE *control_stream;
  65        int verbose_flag;
  66        int do_continue;
  67        char buf[4]; /* actually [BUFSZ] */
  68} FIX_ALIASING;
  69#define G (*(struct globals*)bb_common_bufsiz1)
  70enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
  71#define user           (G.user          )
  72#define password       (G.password      )
  73#define lsa            (G.lsa           )
  74#define control_stream (G.control_stream)
  75#define verbose_flag   (G.verbose_flag  )
  76#define do_continue    (G.do_continue   )
  77#define buf            (G.buf           )
  78#define INIT_G() do { \
  79        setup_common_bufsiz(); \
  80        BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
  81} while (0)
  82
  83
  84static void ftp_die(const char *msg) NORETURN;
  85static void ftp_die(const char *msg)
  86{
  87        char *cp = buf; /* buf holds peer's response */
  88
  89        /* Guard against garbage from remote server */
  90        while (*cp >= ' ' && *cp < '\x7f')
  91                cp++;
  92        *cp = '\0';
  93        bb_error_msg_and_die("unexpected server response%s%s: %s",
  94                        (msg ? " to " : ""), (msg ? msg : ""), buf);
  95}
  96
  97static int ftpcmd(const char *s1, const char *s2)
  98{
  99        unsigned n;
 100
 101        if (verbose_flag) {
 102                bb_error_msg("cmd %s %s", s1, s2);
 103        }
 104
 105        if (s1) {
 106                fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
 107                                                s1, s2);
 108                fflush(control_stream);
 109        }
 110
 111        do {
 112                strcpy(buf, "EOF"); /* for ftp_die */
 113                if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
 114                        ftp_die(NULL);
 115                }
 116        } while (!isdigit(buf[0]) || buf[3] != ' ');
 117
 118        buf[3] = '\0';
 119        n = xatou(buf);
 120        buf[3] = ' ';
 121        return n;
 122}
 123
 124static void ftp_login(void)
 125{
 126        /* Connect to the command socket */
 127        control_stream = fdopen(xconnect_stream(lsa), "r+");
 128        if (control_stream == NULL) {
 129                /* fdopen failed - extremely unlikely */
 130                bb_perror_nomsg_and_die();
 131        }
 132
 133        if (ftpcmd(NULL, NULL) != 220) {
 134                ftp_die(NULL);
 135        }
 136
 137        /*  Login to the server */
 138        switch (ftpcmd("USER", user)) {
 139        case 230:
 140                break;
 141        case 331:
 142                if (ftpcmd("PASS", password) != 230) {
 143                        ftp_die("PASS");
 144                }
 145                break;
 146        default:
 147                ftp_die("USER");
 148        }
 149
 150        ftpcmd("TYPE I", NULL);
 151}
 152
 153static int xconnect_ftpdata(void)
 154{
 155        int port_num;
 156
 157        if (ENABLE_FEATURE_IPV6 && ftpcmd("EPSV", NULL) == 229) {
 158                /* good */
 159        } else if (ftpcmd("PASV", NULL) != 227) {
 160                ftp_die("PASV");
 161        }
 162        port_num = parse_pasv_epsv(buf);
 163        if (port_num < 0)
 164                ftp_die("PASV");
 165
 166        set_nport(&lsa->u.sa, htons(port_num));
 167        return xconnect_stream(lsa);
 168}
 169
 170static int pump_data_and_QUIT(int from, int to)
 171{
 172        /* copy the file */
 173        if (bb_copyfd_eof(from, to) == -1) {
 174                /* error msg is already printed by bb_copyfd_eof */
 175                return EXIT_FAILURE;
 176        }
 177
 178        /* close data connection */
 179        close(from); /* don't know which one is that, so we close both */
 180        close(to);
 181
 182        /* does server confirm that transfer is finished? */
 183        if (ftpcmd(NULL, NULL) != 226) {
 184                ftp_die(NULL);
 185        }
 186        ftpcmd("QUIT", NULL);
 187
 188        return EXIT_SUCCESS;
 189}
 190
 191#if !ENABLE_FTPGET
 192int ftp_receive(const char *local_path, char *server_path);
 193#else
 194static
 195int ftp_receive(const char *local_path, char *server_path)
 196{
 197        int fd_data;
 198        int fd_local = -1;
 199        off_t beg_range = 0;
 200
 201        /* connect to the data socket */
 202        fd_data = xconnect_ftpdata();
 203
 204        if (ftpcmd("SIZE", server_path) != 213) {
 205                do_continue = 0;
 206        }
 207
 208        if (LONE_DASH(local_path)) {
 209                fd_local = STDOUT_FILENO;
 210                do_continue = 0;
 211        }
 212
 213        if (do_continue) {
 214                struct stat sbuf;
 215                /* lstat would be wrong here! */
 216                if (stat(local_path, &sbuf) < 0) {
 217                        bb_perror_msg_and_die("stat");
 218                }
 219                if (sbuf.st_size > 0) {
 220                        beg_range = sbuf.st_size;
 221                } else {
 222                        do_continue = 0;
 223                }
 224        }
 225
 226        if (do_continue) {
 227                sprintf(buf, "REST %"OFF_FMT"u", beg_range);
 228                if (ftpcmd(buf, NULL) != 350) {
 229                        do_continue = 0;
 230                }
 231        }
 232
 233        if (ftpcmd("RETR", server_path) > 150) {
 234                ftp_die("RETR");
 235        }
 236
 237        /* create local file _after_ we know that remote file exists */
 238        if (fd_local == -1) {
 239                fd_local = xopen(local_path,
 240                        do_continue ? (O_APPEND | O_WRONLY)
 241                                    : (O_CREAT | O_TRUNC | O_WRONLY)
 242                );
 243        }
 244
 245        return pump_data_and_QUIT(fd_data, fd_local);
 246}
 247#endif
 248
 249#if !ENABLE_FTPPUT
 250int ftp_send(const char *server_path, char *local_path);
 251#else
 252static
 253int ftp_send(const char *server_path, char *local_path)
 254{
 255        int fd_data;
 256        int fd_local;
 257        int response;
 258
 259        /* connect to the data socket */
 260        fd_data = xconnect_ftpdata();
 261
 262        /* get the local file */
 263        fd_local = STDIN_FILENO;
 264        if (NOT_LONE_DASH(local_path))
 265                fd_local = xopen(local_path, O_RDONLY);
 266
 267        response = ftpcmd("STOR", server_path);
 268        switch (response) {
 269        case 125:
 270        case 150:
 271                break;
 272        default:
 273                ftp_die("STOR");
 274        }
 275
 276        return pump_data_and_QUIT(fd_local, fd_data);
 277}
 278#endif
 279
 280#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
 281static const char ftpgetput_longopts[] ALIGN1 =
 282        "continue\0" Required_argument "c"
 283        "verbose\0"  No_argument       "v"
 284        "username\0" Required_argument "u"
 285        "password\0" Required_argument "p"
 286        "port\0"     Required_argument "P"
 287        ;
 288#endif
 289
 290int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 291int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
 292{
 293        const char *port = "ftp";
 294        /* socket to ftp server */
 295
 296#if ENABLE_FTPPUT && !ENABLE_FTPGET
 297# define ftp_action ftp_send
 298#elif ENABLE_FTPGET && !ENABLE_FTPPUT
 299# define ftp_action ftp_receive
 300#else
 301        int (*ftp_action)(const char *, char *) = ftp_send;
 302
 303        /* Check to see if the command is ftpget or ftput */
 304        if (applet_name[3] == 'g') {
 305                ftp_action = ftp_receive;
 306        }
 307#endif
 308
 309        INIT_G();
 310        /* Set default values */
 311        user = "anonymous";
 312        password = "busybox";
 313
 314        /*
 315         * Decipher the command line
 316         */
 317        /* must have 2 to 3 params; -v and -c count */
 318#define OPTSTRING "^cvu:p:P:" "\0" "-2:?3:vv:cc"
 319#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
 320        getopt32long(argv, OPTSTRING, ftpgetput_longopts,
 321#else
 322        getopt32(argv, OPTSTRING,
 323#endif
 324                        &user, &password, &port, &verbose_flag, &do_continue
 325        );
 326        argv += optind;
 327
 328        /* We want to do exactly _one_ DNS lookup, since some
 329         * sites (i.e. ftp.us.debian.org) use round-robin DNS
 330         * and we want to connect to only one IP... */
 331        lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
 332        if (verbose_flag) {
 333                printf("Connecting to %s (%s)\n", argv[0],
 334                        xmalloc_sockaddr2dotted(&lsa->u.sa));
 335        }
 336
 337        ftp_login();
 338        return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);
 339}
 340