[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * ftpget
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| 4 | *
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| 5 | * Mini implementation of FTP to retrieve a remote file.
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| 6 | *
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| 7 | * Copyright (C) 2002 Jeff Angielski, The PTR Group <jeff@theptrgroup.com>
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| 8 | * Copyright (C) 2002 Glenn McGrath
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| 9 | *
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| 10 | * Based on wget.c by Chip Rosenthal Covad Communications
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| 11 | * <chip@laserlink.net>
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| 12 | *
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| 13 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 14 | */
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| 15 |
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| 16 | #include "libbb.h"
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| 17 |
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| 18 | struct globals {
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| 19 | const char *user;
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| 20 | const char *password;
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| 21 | struct len_and_sockaddr *lsa;
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| 22 | FILE *control_stream;
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| 23 | int verbose_flag;
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| 24 | int do_continue;
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| 25 | char buf[1]; /* actually [BUFSZ] */
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| 26 | } FIX_ALIASING;
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| 27 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 28 | enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
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| 29 | struct BUG_G_too_big {
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| 30 | char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
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| 31 | };
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| 32 | #define user (G.user )
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| 33 | #define password (G.password )
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| 34 | #define lsa (G.lsa )
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| 35 | #define control_stream (G.control_stream)
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| 36 | #define verbose_flag (G.verbose_flag )
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| 37 | #define do_continue (G.do_continue )
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| 38 | #define buf (G.buf )
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| 39 | #define INIT_G() do { } while (0)
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| 40 |
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| 41 |
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| 42 | static void ftp_die(const char *msg) NORETURN;
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| 43 | static void ftp_die(const char *msg)
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| 44 | {
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| 45 | char *cp = buf; /* buf holds peer's response */
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| 46 |
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| 47 | /* Guard against garbage from remote server */
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| 48 | while (*cp >= ' ' && *cp < '\x7f')
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| 49 | cp++;
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| 50 | *cp = '\0';
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| 51 | bb_error_msg_and_die("unexpected server response%s%s: %s",
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| 52 | (msg ? " to " : ""), (msg ? msg : ""), buf);
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| 53 | }
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| 54 |
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| 55 | static int ftpcmd(const char *s1, const char *s2)
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| 56 | {
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| 57 | unsigned n;
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| 58 |
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| 59 | if (verbose_flag) {
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| 60 | bb_error_msg("cmd %s %s", s1, s2);
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| 61 | }
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| 62 |
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| 63 | if (s1) {
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| 64 | fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
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| 65 | s1, s2);
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| 66 | fflush(control_stream);
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| 67 | }
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| 68 |
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| 69 | do {
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| 70 | strcpy(buf, "EOF");
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| 71 | if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
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| 72 | ftp_die(NULL);
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| 73 | }
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| 74 | } while (!isdigit(buf[0]) || buf[3] != ' ');
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| 75 |
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| 76 | buf[3] = '\0';
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| 77 | n = xatou(buf);
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| 78 | buf[3] = ' ';
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| 79 | return n;
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| 80 | }
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| 81 |
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| 82 | static void ftp_login(void)
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| 83 | {
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| 84 | /* Connect to the command socket */
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| 85 | control_stream = fdopen(xconnect_stream(lsa), "r+");
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| 86 | if (control_stream == NULL) {
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| 87 | /* fdopen failed - extremely unlikely */
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| 88 | bb_perror_nomsg_and_die();
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| 89 | }
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| 90 |
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| 91 | if (ftpcmd(NULL, NULL) != 220) {
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| 92 | ftp_die(NULL);
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| 93 | }
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| 94 |
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| 95 | /* Login to the server */
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| 96 | switch (ftpcmd("USER", user)) {
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| 97 | case 230:
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| 98 | break;
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| 99 | case 331:
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| 100 | if (ftpcmd("PASS", password) != 230) {
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| 101 | ftp_die("PASS");
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| 102 | }
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| 103 | break;
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| 104 | default:
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| 105 | ftp_die("USER");
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| 106 | }
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| 107 |
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| 108 | ftpcmd("TYPE I", NULL);
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| 109 | }
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| 110 |
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| 111 | static int xconnect_ftpdata(void)
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| 112 | {
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| 113 | char *buf_ptr;
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| 114 | unsigned port_num;
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| 115 |
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| 116 | /*
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| 117 | TODO: PASV command will not work for IPv6. RFC2428 describes
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| 118 | IPv6-capable "extended PASV" - EPSV.
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| 119 |
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| 120 | "EPSV [protocol]" asks server to bind to and listen on a data port
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| 121 | in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
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| 122 | If not specified, defaults to "same as used for control connection".
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| 123 | If server understood you, it should answer "229 <some text>(|||port|)"
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| 124 | where "|" are literal pipe chars and "port" is ASCII decimal port#.
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| 125 |
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| 126 | There is also an IPv6-capable replacement for PORT (EPRT),
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| 127 | but we don't need that.
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| 128 |
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| 129 | NB: PASV may still work for some servers even over IPv6.
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| 130 | For example, vsftp happily answers
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| 131 | "227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
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| 132 |
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| 133 | TODO2: need to stop ignoring IP address in PASV response.
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| 134 | */
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| 135 |
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| 136 | if (ftpcmd("PASV", NULL) != 227) {
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| 137 | ftp_die("PASV");
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| 138 | }
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| 139 |
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| 140 | /* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
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| 141 | * Server's IP is N1.N2.N3.N4 (we ignore it)
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| 142 | * Server's port for data connection is P1*256+P2 */
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| 143 | buf_ptr = strrchr(buf, ')');
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| 144 | if (buf_ptr) *buf_ptr = '\0';
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| 145 |
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| 146 | buf_ptr = strrchr(buf, ',');
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| 147 | *buf_ptr = '\0';
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| 148 | port_num = xatoul_range(buf_ptr + 1, 0, 255);
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| 149 |
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| 150 | buf_ptr = strrchr(buf, ',');
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| 151 | *buf_ptr = '\0';
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| 152 | port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
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| 153 |
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| 154 | set_nport(lsa, htons(port_num));
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| 155 | return xconnect_stream(lsa);
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| 156 | }
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| 157 |
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| 158 | static int pump_data_and_QUIT(int from, int to)
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| 159 | {
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| 160 | /* copy the file */
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| 161 | if (bb_copyfd_eof(from, to) == -1) {
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| 162 | /* error msg is already printed by bb_copyfd_eof */
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| 163 | return EXIT_FAILURE;
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| 164 | }
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| 165 |
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| 166 | /* close data connection */
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| 167 | close(from); /* don't know which one is that, so we close both */
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| 168 | close(to);
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| 169 |
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| 170 | /* does server confirm that transfer is finished? */
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| 171 | if (ftpcmd(NULL, NULL) != 226) {
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| 172 | ftp_die(NULL);
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| 173 | }
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| 174 | ftpcmd("QUIT", NULL);
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| 175 |
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| 176 | return EXIT_SUCCESS;
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| 177 | }
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| 178 |
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| 179 | #if !ENABLE_FTPGET
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| 180 | int ftp_receive(const char *local_path, char *server_path);
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| 181 | #else
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| 182 | static
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| 183 | int ftp_receive(const char *local_path, char *server_path)
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| 184 | {
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| 185 | int fd_data;
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| 186 | int fd_local = -1;
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| 187 | off_t beg_range = 0;
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| 188 |
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| 189 | /* connect to the data socket */
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| 190 | fd_data = xconnect_ftpdata();
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| 191 |
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| 192 | if (ftpcmd("SIZE", server_path) != 213) {
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| 193 | do_continue = 0;
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| 194 | }
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| 195 |
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| 196 | if (LONE_DASH(local_path)) {
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| 197 | fd_local = STDOUT_FILENO;
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| 198 | do_continue = 0;
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| 199 | }
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| 200 |
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| 201 | if (do_continue) {
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| 202 | struct stat sbuf;
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| 203 | /* lstat would be wrong here! */
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| 204 | if (stat(local_path, &sbuf) < 0) {
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| 205 | bb_perror_msg_and_die("stat");
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| 206 | }
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| 207 | if (sbuf.st_size > 0) {
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| 208 | beg_range = sbuf.st_size;
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| 209 | } else {
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| 210 | do_continue = 0;
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| 211 | }
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| 212 | }
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| 213 |
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| 214 | if (do_continue) {
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| 215 | sprintf(buf, "REST %"OFF_FMT"u", beg_range);
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| 216 | if (ftpcmd(buf, NULL) != 350) {
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| 217 | do_continue = 0;
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| 218 | }
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| 219 | }
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| 220 |
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| 221 | if (ftpcmd("RETR", server_path) > 150) {
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| 222 | ftp_die("RETR");
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| 223 | }
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| 224 |
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| 225 | /* create local file _after_ we know that remote file exists */
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| 226 | if (fd_local == -1) {
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| 227 | fd_local = xopen(local_path,
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| 228 | do_continue ? (O_APPEND | O_WRONLY)
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| 229 | : (O_CREAT | O_TRUNC | O_WRONLY)
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| 230 | );
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| 231 | }
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| 232 |
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| 233 | return pump_data_and_QUIT(fd_data, fd_local);
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| 234 | }
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| 235 | #endif
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| 236 |
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| 237 | #if !ENABLE_FTPPUT
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| 238 | int ftp_send(const char *server_path, char *local_path);
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| 239 | #else
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| 240 | static
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| 241 | int ftp_send(const char *server_path, char *local_path)
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| 242 | {
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| 243 | int fd_data;
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| 244 | int fd_local;
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| 245 | int response;
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| 246 |
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| 247 | /* connect to the data socket */
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| 248 | fd_data = xconnect_ftpdata();
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| 249 |
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| 250 | /* get the local file */
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| 251 | fd_local = STDIN_FILENO;
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| 252 | if (NOT_LONE_DASH(local_path))
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| 253 | fd_local = xopen(local_path, O_RDONLY);
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| 254 |
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| 255 | response = ftpcmd("STOR", server_path);
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| 256 | switch (response) {
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| 257 | case 125:
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| 258 | case 150:
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| 259 | break;
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| 260 | default:
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| 261 | ftp_die("STOR");
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| 262 | }
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| 263 |
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| 264 | return pump_data_and_QUIT(fd_local, fd_data);
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| 265 | }
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| 266 | #endif
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| 267 |
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| 268 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
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| 269 | static const char ftpgetput_longopts[] ALIGN1 =
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| 270 | "continue\0" Required_argument "c"
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| 271 | "verbose\0" No_argument "v"
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| 272 | "username\0" Required_argument "u"
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| 273 | "password\0" Required_argument "p"
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| 274 | "port\0" Required_argument "P"
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| 275 | ;
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| 276 | #endif
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| 277 |
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| 278 | int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 279 | int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
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| 280 | {
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| 281 | unsigned opt;
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| 282 | const char *port = "ftp";
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| 283 | /* socket to ftp server */
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| 284 |
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| 285 | #if ENABLE_FTPPUT && !ENABLE_FTPGET
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| 286 | # define ftp_action ftp_send
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| 287 | #elif ENABLE_FTPGET && !ENABLE_FTPPUT
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| 288 | # define ftp_action ftp_receive
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| 289 | #else
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| 290 | int (*ftp_action)(const char *, char *) = ftp_send;
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| 291 |
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| 292 | /* Check to see if the command is ftpget or ftput */
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| 293 | if (applet_name[3] == 'g') {
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| 294 | ftp_action = ftp_receive;
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| 295 | }
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| 296 | #endif
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| 297 |
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| 298 | INIT_G();
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| 299 | /* Set default values */
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| 300 | user = "anonymous";
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| 301 | password = "busybox@";
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| 302 |
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| 303 | /*
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| 304 | * Decipher the command line
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| 305 | */
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| 306 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
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| 307 | applet_long_options = ftpgetput_longopts;
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| 308 | #endif
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| 309 | opt_complementary = "-2:vv:cc"; /* must have 2 to 3 params; -v and -c count */
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| 310 | opt = getopt32(argv, "cvu:p:P:", &user, &password, &port,
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| 311 | &verbose_flag, &do_continue);
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| 312 | argv += optind;
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| 313 |
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| 314 | /* We want to do exactly _one_ DNS lookup, since some
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| 315 | * sites (i.e. ftp.us.debian.org) use round-robin DNS
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| 316 | * and we want to connect to only one IP... */
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| 317 | lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
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| 318 | if (verbose_flag) {
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| 319 | printf("Connecting to %s (%s)\n", argv[0],
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| 320 | xmalloc_sockaddr2dotted(&lsa->u.sa));
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| 321 | }
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| 322 |
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| 323 | ftp_login();
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| 324 | return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);
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| 325 | }
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