source: MondoRescue/branches/stable/mindi-busybox/networking/ftpgetput.c@ 1770

/* 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 <bug1@iinet.net.au>
 *
 * 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 <getopt.h>
#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 short 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);
int ftpgetput_main(int argc, 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->sa));
    }

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

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