source: MondoRescue/branches/stable/mindi-busybox/networking/ftpgetput.c@ 821

/* 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 <sys/ioctl.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>

#include <sys/socket.h>

#include "busybox.h"

typedef struct ftp_host_info_s {
    char *user;
    char *password;
    struct sockaddr_in *s_in;
} ftp_host_info_t;

static char verbose_flag = 0;
static char do_continue = 0;

static int ftpcmd(const char *s1, const char *s2, FILE *stream, char *buf)
{
    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] != ' ');

    return atoi(buf);
}

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

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

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

    server->s_in->sin_port=htons(port_num);
    return(xconnect(server->s_in));
}

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

    /* Connect to the command socket */
    control_stream = fdopen(xconnect(server->s_in), "r+");
    if (control_stream == NULL) {
        bb_perror_msg_and_die("Couldnt open control stream");
    }

    if (ftpcmd(NULL, NULL, control_stream, buf) != 220) {
        bb_error_msg_and_die("%s", buf + 4);
    }

    /*  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) {
            bb_error_msg_and_die("PASS error: %s", buf + 4);
        }
        break;
    default:
        bb_error_msg_and_die("USER error: %s", buf + 4);
    }

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

    return(control_stream);
}

#if !ENABLE_FTPGET
#define ftp_receive 0
#else
static int ftp_receive(ftp_host_info_t *server, FILE *control_stream,
        const char *local_path, char *server_path)
{
    char buf[512];
    off_t filesize = 0;
    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) {
        bb_error_msg_and_die("PASV error: %s", buf + 4);
    }
    fd_data = xconnect_ftpdata(server, buf);

    if (ftpcmd("SIZE ", server_path, control_stream, buf) == 213) {
        unsigned long value=filesize;
        if (safe_strtoul(buf + 4, &value))
            bb_error_msg_and_die("SIZE error: %s", buf + 4);
        filesize = value;
    } else {
        filesize = -1;
        do_continue = 0;
    }

    if ((local_path[0] == '-') && (local_path[1] == '\0')) {
        fd_local = STDOUT_FILENO;
        do_continue = 0;
    }

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

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

    if (ftpcmd("RETR ", server_path, control_stream, buf) > 150) {
        bb_error_msg_and_die("RETR error: %s", buf + 4);
    }

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

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

    /* close it all down */
    close(fd_data);
    if (ftpcmd(NULL, NULL, control_stream, buf) != 226) {
        bb_error_msg_and_die("ftp error: %s", buf + 4);
    }
    ftpcmd("QUIT", NULL, control_stream, buf);

    return(EXIT_SUCCESS);
}
#endif

#if !ENABLE_FTPPUT
#define ftp_send 0
#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) {
        bb_error_msg_and_die("PASV error: %s", buf + 4);
    }
    fd_data = xconnect_ftpdata(server, buf);

    /* get the local file */
    if ((local_path[0] == '-') && (local_path[1] == '\0')) {
        fd_local = STDIN_FILENO;
    } else {
        fd_local = bb_xopen(local_path, O_RDONLY);
        fstat(fd_local, &sbuf);

        sprintf(buf, "ALLO %lu", (unsigned long)sbuf.st_size);
        response = ftpcmd(buf, NULL, control_stream, buf);
        switch (response) {
        case 200:
        case 202:
            break;
        default:
            close(fd_local);
            bb_error_msg_and_die("ALLO error: %s", buf + 4);
            break;
        }
    }
    response = ftpcmd("STOR ", server_path, control_stream, buf);
    switch (response) {
    case 125:
    case 150:
        break;
    default:
        close(fd_local);
        bb_error_msg_and_die("STOR error: %s", buf + 4);
    }

    /* 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) {
        bb_error_msg_and_die("error: %s", buf + 4);
    }
    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 struct option ftpgetput_long_options[] = {
    {"continue", 1, NULL, 'c'},
    {"verbose", 0, NULL, 'v'},
    {"username", 1, NULL, 'u'},
    {"password", 1, NULL, 'p'},
    {"port", 1, NULL, 'P'},
    {0, 0, 0, 0}
};
#else
#define ftpgetput_long_options 0
#endif

int ftpgetput_main(int argc, char **argv)
{
    /* content-length of the file */
    unsigned long opt;
    char *port = "ftp";

    /* socket to ftp server */
    FILE *control_stream;
    struct sockaddr_in s_in;

    /* continue a prev transfer (-c) */
    ftp_host_info_t *server;

    int (*ftp_action)(ftp_host_info_t *, FILE *, const char *, char *) = NULL;

    /* Check to see if the command is ftpget or ftput */
    if (ENABLE_FTPPUT && (!ENABLE_FTPGET || bb_applet_name[3] == 'p')) {
        ftp_action = ftp_send;
    }
    if (ENABLE_FTPGET && (!ENABLE_FTPPUT || bb_applet_name[3] == 'g')) {
        ftp_action = ftp_receive;
    }

    /* Set default values */
    server = xmalloc(sizeof(ftp_host_info_t));
    server->user = "anonymous";
    server->password = "busybox@";
    verbose_flag = 0;

    /*
     * Decipher the command line
     */
    if (ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS)
        bb_applet_long_options = ftpgetput_long_options;

    opt = bb_getopt_ulflags(argc, argv, "cvu:p:P:", &server->user, &server->password, &port);

    /* Process the non-option command line arguments */
    if (argc - optind != 3) {
        bb_show_usage();
    }

    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->s_in = &s_in;
    bb_lookup_host(&s_in, argv[optind]);
    s_in.sin_port = bb_lookup_port(port, "tcp", 21);
    if (verbose_flag) {
        printf("Connecting to %s[%s]:%d\n",
                argv[optind], inet_ntoa(s_in.sin_addr), ntohs(s_in.sin_port));
    }

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

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