mirror of
https://github.com/sheumann/hush.git
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326 lines
7.4 KiB
C
326 lines
7.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* ftpget
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*
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* Mini implementation of FTP to retrieve a remote file.
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*
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* Copyright (C) 2002 Jeff Angielski, The PTR Group <jeff@theptrgroup.com>
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* Copyright (C) 2002 Glenn McGrath
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*
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* Based on wget.c by Chip Rosenthal Covad Communications
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* <chip@laserlink.net>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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struct globals {
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const char *user;
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const char *password;
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struct len_and_sockaddr *lsa;
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FILE *control_stream;
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int verbose_flag;
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int do_continue;
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char buf[1]; /* actually [BUFSZ] */
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
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struct BUG_G_too_big {
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char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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};
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#define user (G.user )
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#define password (G.password )
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#define lsa (G.lsa )
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#define control_stream (G.control_stream)
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#define verbose_flag (G.verbose_flag )
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#define do_continue (G.do_continue )
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#define buf (G.buf )
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#define INIT_G() do { } while (0)
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static void ftp_die(const char *msg) NORETURN;
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static void ftp_die(const char *msg)
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{
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char *cp = buf; /* buf holds peer's response */
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/* Guard against garbage from remote server */
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while (*cp >= ' ' && *cp < '\x7f')
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cp++;
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*cp = '\0';
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bb_error_msg_and_die("unexpected server response%s%s: %s",
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(msg ? " to " : ""), (msg ? msg : ""), buf);
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}
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static int ftpcmd(const char *s1, const char *s2)
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{
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unsigned n;
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if (verbose_flag) {
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bb_error_msg("cmd %s %s", s1, s2);
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}
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if (s1) {
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fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
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s1, s2);
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fflush(control_stream);
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}
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do {
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strcpy(buf, "EOF");
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if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
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ftp_die(NULL);
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}
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} while (!isdigit(buf[0]) || buf[3] != ' ');
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buf[3] = '\0';
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n = xatou(buf);
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buf[3] = ' ';
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return n;
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}
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static void ftp_login(void)
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{
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/* Connect to the command socket */
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control_stream = fdopen(xconnect_stream(lsa), "r+");
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if (control_stream == NULL) {
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/* fdopen failed - extremely unlikely */
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bb_perror_nomsg_and_die();
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}
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if (ftpcmd(NULL, NULL) != 220) {
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ftp_die(NULL);
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}
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/* Login to the server */
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switch (ftpcmd("USER", user)) {
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case 230:
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break;
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case 331:
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if (ftpcmd("PASS", password) != 230) {
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ftp_die("PASS");
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}
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break;
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default:
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ftp_die("USER");
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}
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ftpcmd("TYPE I", NULL);
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}
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static int xconnect_ftpdata(void)
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{
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char *buf_ptr;
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unsigned port_num;
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/*
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TODO: PASV command will not work for IPv6. RFC2428 describes
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IPv6-capable "extended PASV" - EPSV.
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"EPSV [protocol]" asks server to bind to and listen on a data port
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in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
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If not specified, defaults to "same as used for control connection".
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If server understood you, it should answer "229 <some text>(|||port|)"
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where "|" are literal pipe chars and "port" is ASCII decimal port#.
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There is also an IPv6-capable replacement for PORT (EPRT),
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but we don't need that.
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NB: PASV may still work for some servers even over IPv6.
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For example, vsftp happily answers
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"227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
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TODO2: need to stop ignoring IP address in PASV response.
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*/
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if (ftpcmd("PASV", NULL) != 227) {
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ftp_die("PASV");
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}
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/* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
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* Server's IP is N1.N2.N3.N4 (we ignore it)
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* Server's port for data connection is P1*256+P2 */
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buf_ptr = strrchr(buf, ')');
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if (buf_ptr) *buf_ptr = '\0';
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buf_ptr = strrchr(buf, ',');
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*buf_ptr = '\0';
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port_num = xatoul_range(buf_ptr + 1, 0, 255);
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buf_ptr = strrchr(buf, ',');
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*buf_ptr = '\0';
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port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
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set_nport(lsa, htons(port_num));
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return xconnect_stream(lsa);
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}
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static int pump_data_and_QUIT(int from, int to)
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{
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/* copy the file */
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if (bb_copyfd_eof(from, to) == -1) {
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/* error msg is already printed by bb_copyfd_eof */
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return EXIT_FAILURE;
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}
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/* close data connection */
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close(from); /* don't know which one is that, so we close both */
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close(to);
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/* does server confirm that transfer is finished? */
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if (ftpcmd(NULL, NULL) != 226) {
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ftp_die(NULL);
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}
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ftpcmd("QUIT", NULL);
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return EXIT_SUCCESS;
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}
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#if !ENABLE_FTPGET
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int ftp_receive(const char *local_path, char *server_path);
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#else
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static
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int ftp_receive(const char *local_path, char *server_path)
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{
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int fd_data;
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int fd_local = -1;
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off_t beg_range = 0;
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/* connect to the data socket */
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fd_data = xconnect_ftpdata();
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if (ftpcmd("SIZE", server_path) != 213) {
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do_continue = 0;
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}
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if (LONE_DASH(local_path)) {
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fd_local = STDOUT_FILENO;
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do_continue = 0;
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}
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if (do_continue) {
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struct stat sbuf;
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/* lstat would be wrong here! */
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if (stat(local_path, &sbuf) < 0) {
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bb_perror_msg_and_die("stat");
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}
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if (sbuf.st_size > 0) {
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beg_range = sbuf.st_size;
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} else {
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do_continue = 0;
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}
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}
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if (do_continue) {
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sprintf(buf, "REST %"OFF_FMT"u", beg_range);
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if (ftpcmd(buf, NULL) != 350) {
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do_continue = 0;
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}
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}
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if (ftpcmd("RETR", server_path) > 150) {
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ftp_die("RETR");
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}
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/* create local file _after_ we know that remote file exists */
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if (fd_local == -1) {
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fd_local = xopen(local_path,
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do_continue ? (O_APPEND | O_WRONLY)
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: (O_CREAT | O_TRUNC | O_WRONLY)
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);
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}
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return pump_data_and_QUIT(fd_data, fd_local);
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}
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#endif
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#if !ENABLE_FTPPUT
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int ftp_send(const char *server_path, char *local_path);
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#else
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static
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int ftp_send(const char *server_path, char *local_path)
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{
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int fd_data;
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int fd_local;
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int response;
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/* connect to the data socket */
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fd_data = xconnect_ftpdata();
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/* get the local file */
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fd_local = STDIN_FILENO;
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if (NOT_LONE_DASH(local_path))
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fd_local = xopen(local_path, O_RDONLY);
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response = ftpcmd("STOR", server_path);
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switch (response) {
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case 125:
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case 150:
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break;
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default:
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ftp_die("STOR");
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}
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return pump_data_and_QUIT(fd_local, fd_data);
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}
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#endif
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#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
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static const char ftpgetput_longopts[] ALIGN1 =
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"continue\0" Required_argument "c"
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"verbose\0" No_argument "v"
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"username\0" Required_argument "u"
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"password\0" Required_argument "p"
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"port\0" Required_argument "P"
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;
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#endif
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int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opt;
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const char *port = "ftp";
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/* socket to ftp server */
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#if ENABLE_FTPPUT && !ENABLE_FTPGET
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# define ftp_action ftp_send
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#elif ENABLE_FTPGET && !ENABLE_FTPPUT
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# define ftp_action ftp_receive
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#else
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int (*ftp_action)(const char *, char *) = ftp_send;
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/* Check to see if the command is ftpget or ftput */
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if (applet_name[3] == 'g') {
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ftp_action = ftp_receive;
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}
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#endif
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INIT_G();
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/* Set default values */
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user = "anonymous";
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password = "busybox@";
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/*
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* Decipher the command line
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*/
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#if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
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applet_long_options = ftpgetput_longopts;
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#endif
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opt_complementary = "-2:vv:cc"; /* must have 2 to 3 params; -v and -c count */
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opt = getopt32(argv, "cvu:p:P:", &user, &password, &port,
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&verbose_flag, &do_continue);
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argv += optind;
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/* We want to do exactly _one_ DNS lookup, since some
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* sites (i.e. ftp.us.debian.org) use round-robin DNS
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* and we want to connect to only one IP... */
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lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
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if (verbose_flag) {
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printf("Connecting to %s (%s)\n", argv[0],
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xmalloc_sockaddr2dotted(&lsa->u.sa));
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}
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ftp_login();
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return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);
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}
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