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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struct globals {
const char *user;
const char *password;
struct len_and_sockaddr *lsa;
FILE *control_stream;
int verbose_flag;
int do_continue;
char buf[1]; /* actually [BUFSZ] */
};
#define G (*(struct globals*)&bb_common_bufsiz1)
enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
struct BUG_G_too_big {
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char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
};
#define user (G.user )
#define password (G.password )
#define lsa (G.lsa )
#define control_stream (G.control_stream)
#define verbose_flag (G.verbose_flag )
#define do_continue (G.do_continue )
#define buf (G.buf )
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#define INIT_G() do { } while (0)
static void ftp_die(const char *msg) ATTRIBUTE_NORETURN;
static void ftp_die(const char *msg)
{
char *cp = buf; /* buf holds peer's response */
/* Guard against garbage from remote server */
while (*cp >= ' ' && *cp < '\x7f')
cp++;
*cp = '\0';
bb_error_msg_and_die("unexpected server response%s%s: %s",
(msg ? " to " : ""), (msg ? msg : ""), buf);
}
static int ftpcmd(const char *s1, const char *s2)
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{
unsigned n;
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if (verbose_flag) {
bb_error_msg("cmd %s %s", s1, s2);
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}
if (s1) {
fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
s1, s2);
fflush(control_stream);
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}
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do {
strcpy(buf, "EOF");
if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
ftp_die(NULL);
}
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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 void ftp_login(void)
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{
/* Connect to the command socket */
control_stream = fdopen(xconnect_stream(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) != 220) {
ftp_die(NULL);
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}
/* Login to the server */
switch (ftpcmd("USER", user)) {
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case 230:
break;
case 331:
if (ftpcmd("PASS", password) != 230) {
ftp_die("PASS");
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}
break;
default:
ftp_die("USER");
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}
ftpcmd("TYPE I", NULL);
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}
static int xconnect_ftpdata(void)
{
char *buf_ptr;
unsigned port_num;
/*
TODO: PASV command will not work for IPv6. RFC2428 describes
IPv6-capable "extended PASV" - EPSV.
"EPSV [protocol]" asks server to bind to and listen on a data port
in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
If not specified, defaults to "same as used for control connection".
If server understood you, it should answer "229 <some text>(|||port|)"
where "|" are literal pipe chars and "port" is ASCII decimal port#.
There is also an IPv6-capable replacement for PORT (EPRT),
but we don't need that.
NB: PASV may still work for some servers even over IPv6.
For example, vsftp happily answers
"227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
TODO2: need to stop ignoring IP address in PASV response.
*/
if (ftpcmd("PASV", NULL) != 227) {
ftp_die("PASV");
}
/* 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(lsa, htons(port_num));
return xconnect_stream(lsa);
}
static int pump_data_and_QUIT(int from, int to)
{
/* copy the file */
if (bb_copyfd_eof(from, to) == -1) {
/* error msg is already printed by bb_copyfd_eof */
return EXIT_FAILURE;
}
/* close data connection */
close(from); /* don't know which one is that, so we close both */
close(to);
/* does server confirm that transfer is finished? */
if (ftpcmd(NULL, NULL) != 226) {
ftp_die(NULL);
}
ftpcmd("QUIT", NULL);
return EXIT_SUCCESS;
}
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#if !ENABLE_FTPGET
int ftp_receive(const char *local_path, char *server_path);
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#else
static
int ftp_receive(const char *local_path, char *server_path)
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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 */
fd_data = xconnect_ftpdata();
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if (ftpcmd("SIZE", server_path) != 213) {
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;
/* lstat would be wrong here! */
if (stat(local_path, &sbuf) < 0) {
bb_perror_msg_and_die("stat");
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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);
if (ftpcmd(buf, NULL) != 350) {
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do_continue = 0;
}
}
if (ftpcmd("RETR", server_path) > 150) {
ftp_die("RETR");
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}
/* create local file _after_ we know that remote file exists */
if (fd_local == -1) {
fd_local = xopen(local_path,
do_continue ? (O_APPEND | O_WRONLY)
: (O_CREAT | O_TRUNC | O_WRONLY)
);
}
return pump_data_and_QUIT(fd_data, fd_local);
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}
#endif
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#if !ENABLE_FTPPUT
int ftp_send(const char *server_path, char *local_path);
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#else
static
int ftp_send(const char *server_path, char *local_path)
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{
int fd_data;
int fd_local;
int response;
/* connect to the data socket */
fd_data = xconnect_ftpdata();
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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);
response = ftpcmd("STOR", server_path);
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switch (response) {
case 125:
case 150:
break;
default:
ftp_die("STOR");
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}
return pump_data_and_QUIT(fd_local, fd_data);
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}
#endif
#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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{
unsigned opt;
const char *port = "ftp";
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/* socket to ftp 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)(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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INIT_G();
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/* Set default values */
user = "anonymous";
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:vv:cc"; /* must have 3 params; -v and -c count */
opt = getopt32(argv, "cvu:p:P:", &user, &password, &port,
&verbose_flag, &do_continue);
argv += optind;
/* 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... */
lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
if (verbose_flag) {
printf("Connecting to %s (%s)\n", argv[0],
xmalloc_sockaddr2dotted(&lsa->u.sa));
}
ftp_login();
return ftp_action(argv[1], argv[2]);
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}