busybox/networking/ftpgetput.c

342 lines
7.9 KiB
C

/* 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 "busybox.h"
#include <getopt.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 xatou(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 = xatoul_range(buf_ptr + 1, 0, 255);
buf_ptr = strrchr(buf, ',');
*buf_ptr = '\0';
port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
server->s_in->sin_port = htons(port_num);
return xconnect_tcp_v4(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_tcp_v4(server->s_in), "r+");
if (control_stream == NULL) {
bb_perror_msg_and_die("cannot 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
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];
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) {
if (SAFE_STRTOOFF(buf + 4, &filesize))
bb_error_msg_and_die("SIZE error: %s", buf + 4);
} 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("lstat");
}
if (sbuf.st_size > 0) {
beg_range = sbuf.st_size;
} else {
do_continue = 0;
}
}
if (do_continue) {
sprintf(buf, "REST "OFF_FMT, 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 = xopen(local_path, O_APPEND | O_WRONLY);
} else {
fd_local = xopen3(local_path, O_CREAT | O_TRUNC | O_WRONLY, 0666);
}
}
/* 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
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) {
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 = 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 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 || applet_name[3] == 'p')) {
ftp_action = ftp_send;
}
if (ENABLE_FTPGET && (!ENABLE_FTPPUT || 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)
applet_long_options = ftpgetput_long_options;
opt = getopt32(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]));
}