busybox/networking/ftpgetput.c

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/* vi: set sw=4 ts=4: */
/*
* ftpget
*
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* Mini implementation of FTP to retrieve a remote file.
*
* Copyright (C) 2002 Jeff Angielski, The PTR Group <jeff@theptrgroup.com>
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* Copyright (C) 2002 Glenn McGrath
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*
* 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.
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*/
#include "libbb.h"
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typedef struct ftp_host_info_s {
const char *user;
const char *password;
struct len_and_sockaddr *lsa;
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} ftp_host_info_t;
static smallint verbose_flag;
static smallint do_continue;
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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);
}
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static int ftpcmd(const char *s1, const char *s2, FILE *stream, char *buf)
{
unsigned n;
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if (verbose_flag) {
bb_error_msg("cmd %s %s", s1, s2);
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}
if (s1) {
if (s2) {
fprintf(stream, "%s %s\r\n", s1, s2);
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} else {
fprintf(stream, "%s\r\n", s1);
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}
}
do {
char *buf_ptr;
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if (fgets(buf, 510, stream) == NULL) {
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bb_perror_msg_and_die("fgets");
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}
buf_ptr = strstr(buf, "\r\n");
if (buf_ptr) {
*buf_ptr = '\0';
}
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} while (!isdigit(buf[0]) || buf[3] != ' ');
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buf[3] = '\0';
n = xatou(buf);
buf[3] = ' ';
return n;
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}
static int xconnect_ftpdata(ftp_host_info_t *server, char *buf)
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{
char *buf_ptr;
unsigned port_num;
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/* 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';
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buf_ptr = strrchr(buf, ',');
*buf_ptr = '\0';
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port_num = xatoul_range(buf_ptr + 1, 0, 255);
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buf_ptr = strrchr(buf, ',');
*buf_ptr = '\0';
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port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
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set_nport(server->lsa, htons(port_num));
return xconnect_stream(server->lsa);
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}
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+");
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if (control_stream == NULL) {
/* fdopen failed - extremely unlikely */
bb_perror_nomsg_and_die();
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}
if (ftpcmd(NULL, NULL, control_stream, buf) != 220) {
ftp_die(NULL, buf);
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}
/* Login to the server */
switch (ftpcmd("USER", server->user, control_stream, buf)) {
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case 230:
break;
case 331:
if (ftpcmd("PASS", server->password, control_stream, buf) != 230) {
ftp_die("PASS", buf);
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}
break;
default:
ftp_die("USER", buf);
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}
ftpcmd("TYPE I", NULL, control_stream, buf);
return control_stream;
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}
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#if !ENABLE_FTPGET
int ftp_receive(ftp_host_info_t *server, FILE *control_stream,
const char *local_path, char *server_path);
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#else
static
int ftp_receive(ftp_host_info_t *server, FILE *control_stream,
const char *local_path, char *server_path)
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{
char buf[512];
/* I think 'filesize' usage here is bogus. Let's see... */
//off_t filesize = -1;
#define filesize ((off_t)-1)
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int fd_data;
int fd_local = -1;
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off_t beg_range = 0;
/* Connect to the data socket */
if (ftpcmd("PASV", NULL, control_stream, buf) != 227) {
ftp_die("PASV", buf);
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}
fd_data = xconnect_ftpdata(server, buf);
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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;
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}
if (LONE_DASH(local_path)) {
fd_local = STDOUT_FILENO;
do_continue = 0;
}
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if (do_continue) {
struct stat sbuf;
if (lstat(local_path, &sbuf) < 0) {
bb_perror_msg_and_die("lstat");
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}
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);
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if (ftpcmd(buf, NULL, control_stream, buf) != 350) {
do_continue = 0;
} else {
//if (filesize != -1)
// filesize -= beg_range;
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}
}
if (ftpcmd("RETR", server_path, control_stream, buf) > 150) {
ftp_die("RETR", buf);
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}
/* 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);
}
}
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/* 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;
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}
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/* close it all down */
close(fd_data);
if (ftpcmd(NULL, NULL, control_stream, buf) != 226) {
ftp_die(NULL, buf);
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}
ftpcmd("QUIT", NULL, control_stream, buf);
return EXIT_SUCCESS;
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}
#endif
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#if !ENABLE_FTPPUT
int ftp_send(ftp_host_info_t *server, FILE *control_stream,
const char *server_path, char *local_path);
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#else
static
int ftp_send(ftp_host_info_t *server, FILE *control_stream,
const char *server_path, char *local_path)
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{
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);
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}
fd_data = xconnect_ftpdata(server, buf);
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/* 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;
}
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}
response = ftpcmd("STOR", server_path, control_stream, buf);
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switch (response) {
case 125:
case 150:
break;
default:
close(fd_local);
ftp_die("STOR", buf);
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}
/* transfer the file */
if (bb_copyfd_eof(fd_local, fd_data) == -1) {
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exit(EXIT_FAILURE);
}
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/* close it all down */
close(fd_data);
if (ftpcmd(NULL, NULL, control_stream, buf) != 226) {
ftp_die("close", buf);
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}
ftpcmd("QUIT", NULL, control_stream, buf);
return EXIT_SUCCESS;
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}
#endif
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#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 =
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"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
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int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ftpgetput_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
/* content-length of the file */
unsigned opt;
const char *port = "ftp";
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/* socket to ftp server */
FILE *control_stream;
/* continue previous transfer (-c) */
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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;
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}
#endif
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/* Set default values */
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server = xmalloc(sizeof(*server));
server->user = "anonymous";
server->password = "busybox@";
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/*
* Decipher the command line
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*/
#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
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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 */
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if (opt & FTPGETPUT_OPT_CONTINUE) {
do_continue = 1;
}
if (opt & FTPGETPUT_OPT_VERBOSE) {
verbose_flag = 1;
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}
/* 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... */
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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 */
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control_stream = ftp_login(server);
return ftp_action(server, control_stream, argv[1], argv[2]);
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}