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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