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 | //usage:#define ftpget_trivial_usage
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17 | //usage: "[OPTIONS] HOST [LOCAL_FILE] REMOTE_FILE"
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18 | //usage:#define ftpget_full_usage "\n\n"
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19 | //usage: "Download a file via FTP\n"
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20 | //usage: IF_FEATURE_FTPGETPUT_LONG_OPTIONS(
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21 | //usage: "\n -c,--continue Continue previous transfer"
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22 | //usage: "\n -v,--verbose Verbose"
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23 | //usage: "\n -u,--username USER Username"
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24 | //usage: "\n -p,--password PASS Password"
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25 | //usage: "\n -P,--port NUM Port"
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26 | //usage: )
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27 | //usage: IF_NOT_FEATURE_FTPGETPUT_LONG_OPTIONS(
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28 | //usage: "\n -c Continue previous transfer"
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29 | //usage: "\n -v Verbose"
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30 | //usage: "\n -u USER Username"
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31 | //usage: "\n -p PASS Password"
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32 | //usage: "\n -P NUM Port"
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33 | //usage: )
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34 | //usage:
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35 | //usage:#define ftpput_trivial_usage
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36 | //usage: "[OPTIONS] HOST [REMOTE_FILE] LOCAL_FILE"
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37 | //usage:#define ftpput_full_usage "\n\n"
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38 | //usage: "Upload a file to a FTP server\n"
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39 | //usage: IF_FEATURE_FTPGETPUT_LONG_OPTIONS(
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40 | //usage: "\n -v,--verbose Verbose"
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41 | //usage: "\n -u,--username USER Username"
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42 | //usage: "\n -p,--password PASS Password"
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43 | //usage: "\n -P,--port NUM Port"
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44 | //usage: )
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45 | //usage: IF_NOT_FEATURE_FTPGETPUT_LONG_OPTIONS(
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46 | //usage: "\n -v Verbose"
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47 | //usage: "\n -u USER Username"
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48 | //usage: "\n -p PASS Password"
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49 | //usage: "\n -P NUM Port number"
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50 | //usage: )
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51 |
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52 | #include "libbb.h"
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53 | #include "common_bufsiz.h"
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54 |
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55 | struct globals {
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56 | const char *user;
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57 | const char *password;
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58 | struct len_and_sockaddr *lsa;
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59 | FILE *control_stream;
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60 | int verbose_flag;
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61 | int do_continue;
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62 | char buf[4]; /* actually [BUFSZ] */
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63 | } FIX_ALIASING;
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64 | #define G (*(struct globals*)bb_common_bufsiz1)
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65 | enum { BUFSZ = COMMON_BUFSIZE - offsetof(struct globals, buf) };
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66 | #define user (G.user )
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67 | #define password (G.password )
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68 | #define lsa (G.lsa )
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69 | #define control_stream (G.control_stream)
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70 | #define verbose_flag (G.verbose_flag )
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71 | #define do_continue (G.do_continue )
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72 | #define buf (G.buf )
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73 | #define INIT_G() do { \
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74 | setup_common_bufsiz(); \
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75 | BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
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76 | } while (0)
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77 |
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78 |
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79 | static void ftp_die(const char *msg) NORETURN;
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80 | static void ftp_die(const char *msg)
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81 | {
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82 | char *cp = buf; /* buf holds peer's response */
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83 |
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84 | /* Guard against garbage from remote server */
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85 | while (*cp >= ' ' && *cp < '\x7f')
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86 | cp++;
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87 | *cp = '\0';
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88 | bb_error_msg_and_die("unexpected server response%s%s: %s",
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89 | (msg ? " to " : ""), (msg ? msg : ""), buf);
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90 | }
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91 |
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92 | static int ftpcmd(const char *s1, const char *s2)
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93 | {
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94 | unsigned n;
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95 |
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96 | if (verbose_flag) {
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97 | bb_error_msg("cmd %s %s", s1, s2);
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98 | }
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99 |
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100 | if (s1) {
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101 | fprintf(control_stream, (s2 ? "%s %s\r\n" : "%s %s\r\n"+3),
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102 | s1, s2);
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103 | fflush(control_stream);
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104 | }
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105 |
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106 | do {
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107 | strcpy(buf, "EOF"); /* for ftp_die */
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108 | if (fgets(buf, BUFSZ - 2, control_stream) == NULL) {
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109 | ftp_die(NULL);
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110 | }
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111 | } while (!isdigit(buf[0]) || buf[3] != ' ');
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112 |
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113 | buf[3] = '\0';
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114 | n = xatou(buf);
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115 | buf[3] = ' ';
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116 | return n;
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117 | }
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118 |
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119 | static void ftp_login(void)
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120 | {
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121 | /* Connect to the command socket */
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122 | control_stream = fdopen(xconnect_stream(lsa), "r+");
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123 | if (control_stream == NULL) {
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124 | /* fdopen failed - extremely unlikely */
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125 | bb_perror_nomsg_and_die();
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126 | }
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127 |
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128 | if (ftpcmd(NULL, NULL) != 220) {
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129 | ftp_die(NULL);
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130 | }
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131 |
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132 | /* Login to the server */
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133 | switch (ftpcmd("USER", user)) {
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134 | case 230:
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135 | break;
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136 | case 331:
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137 | if (ftpcmd("PASS", password) != 230) {
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138 | ftp_die("PASS");
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139 | }
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140 | break;
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141 | default:
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142 | ftp_die("USER");
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143 | }
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144 |
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145 | ftpcmd("TYPE I", NULL);
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146 | }
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147 |
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148 | static int xconnect_ftpdata(void)
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149 | {
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150 | char *buf_ptr;
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151 | unsigned port_num;
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152 |
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153 | /*
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154 | TODO: PASV command will not work for IPv6. RFC2428 describes
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155 | IPv6-capable "extended PASV" - EPSV.
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156 |
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157 | "EPSV [protocol]" asks server to bind to and listen on a data port
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158 | in specified protocol. Protocol is 1 for IPv4, 2 for IPv6.
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159 | If not specified, defaults to "same as used for control connection".
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160 | If server understood you, it should answer "229 <some text>(|||port|)"
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161 | where "|" are literal pipe chars and "port" is ASCII decimal port#.
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162 |
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163 | There is also an IPv6-capable replacement for PORT (EPRT),
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164 | but we don't need that.
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165 |
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166 | NB: PASV may still work for some servers even over IPv6.
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167 | For example, vsftp happily answers
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168 | "227 Entering Passive Mode (0,0,0,0,n,n)" and proceeds as usual.
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169 |
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170 | TODO2: need to stop ignoring IP address in PASV response.
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171 | */
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172 |
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173 | if (ftpcmd("PASV", NULL) != 227) {
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174 | ftp_die("PASV");
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175 | }
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176 |
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177 | /* Response is "NNN garbageN1,N2,N3,N4,P1,P2[)garbage]
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178 | * Server's IP is N1.N2.N3.N4 (we ignore it)
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179 | * Server's port for data connection is P1*256+P2 */
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180 | buf_ptr = strrchr(buf, ')');
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181 | if (buf_ptr) *buf_ptr = '\0';
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182 |
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183 | buf_ptr = strrchr(buf, ',');
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184 | *buf_ptr = '\0';
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185 | port_num = xatoul_range(buf_ptr + 1, 0, 255);
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186 |
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187 | buf_ptr = strrchr(buf, ',');
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188 | *buf_ptr = '\0';
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189 | port_num += xatoul_range(buf_ptr + 1, 0, 255) * 256;
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190 |
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191 | set_nport(&lsa->u.sa, htons(port_num));
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192 | return xconnect_stream(lsa);
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193 | }
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194 |
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195 | static int pump_data_and_QUIT(int from, int to)
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196 | {
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197 | /* copy the file */
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198 | if (bb_copyfd_eof(from, to) == -1) {
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199 | /* error msg is already printed by bb_copyfd_eof */
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200 | return EXIT_FAILURE;
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201 | }
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202 |
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203 | /* close data connection */
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204 | close(from); /* don't know which one is that, so we close both */
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205 | close(to);
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206 |
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207 | /* does server confirm that transfer is finished? */
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208 | if (ftpcmd(NULL, NULL) != 226) {
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209 | ftp_die(NULL);
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210 | }
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211 | ftpcmd("QUIT", NULL);
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212 |
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213 | return EXIT_SUCCESS;
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214 | }
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215 |
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216 | #if !ENABLE_FTPGET
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217 | int ftp_receive(const char *local_path, char *server_path);
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218 | #else
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219 | static
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220 | int ftp_receive(const char *local_path, char *server_path)
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221 | {
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222 | int fd_data;
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223 | int fd_local = -1;
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224 | off_t beg_range = 0;
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225 |
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226 | /* connect to the data socket */
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227 | fd_data = xconnect_ftpdata();
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228 |
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229 | if (ftpcmd("SIZE", server_path) != 213) {
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230 | do_continue = 0;
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231 | }
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232 |
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233 | if (LONE_DASH(local_path)) {
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234 | fd_local = STDOUT_FILENO;
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235 | do_continue = 0;
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236 | }
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237 |
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238 | if (do_continue) {
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239 | struct stat sbuf;
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240 | /* lstat would be wrong here! */
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241 | if (stat(local_path, &sbuf) < 0) {
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242 | bb_perror_msg_and_die("stat");
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243 | }
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244 | if (sbuf.st_size > 0) {
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245 | beg_range = sbuf.st_size;
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246 | } else {
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247 | do_continue = 0;
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248 | }
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249 | }
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250 |
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251 | if (do_continue) {
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252 | sprintf(buf, "REST %"OFF_FMT"u", beg_range);
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253 | if (ftpcmd(buf, NULL) != 350) {
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254 | do_continue = 0;
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255 | }
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256 | }
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257 |
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258 | if (ftpcmd("RETR", server_path) > 150) {
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259 | ftp_die("RETR");
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260 | }
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261 |
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262 | /* create local file _after_ we know that remote file exists */
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263 | if (fd_local == -1) {
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264 | fd_local = xopen(local_path,
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265 | do_continue ? (O_APPEND | O_WRONLY)
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266 | : (O_CREAT | O_TRUNC | O_WRONLY)
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267 | );
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268 | }
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269 |
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270 | return pump_data_and_QUIT(fd_data, fd_local);
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271 | }
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272 | #endif
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273 |
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274 | #if !ENABLE_FTPPUT
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275 | int ftp_send(const char *server_path, char *local_path);
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276 | #else
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277 | static
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278 | int ftp_send(const char *server_path, char *local_path)
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279 | {
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280 | int fd_data;
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281 | int fd_local;
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282 | int response;
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283 |
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284 | /* connect to the data socket */
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285 | fd_data = xconnect_ftpdata();
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286 |
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287 | /* get the local file */
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288 | fd_local = STDIN_FILENO;
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289 | if (NOT_LONE_DASH(local_path))
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290 | fd_local = xopen(local_path, O_RDONLY);
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291 |
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292 | response = ftpcmd("STOR", server_path);
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293 | switch (response) {
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294 | case 125:
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295 | case 150:
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296 | break;
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297 | default:
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298 | ftp_die("STOR");
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299 | }
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300 |
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301 | return pump_data_and_QUIT(fd_local, fd_data);
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302 | }
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303 | #endif
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304 |
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305 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
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306 | static const char ftpgetput_longopts[] ALIGN1 =
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307 | "continue\0" Required_argument "c"
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308 | "verbose\0" No_argument "v"
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309 | "username\0" Required_argument "u"
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310 | "password\0" Required_argument "p"
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311 | "port\0" Required_argument "P"
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312 | ;
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313 | #endif
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314 |
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315 | int ftpgetput_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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316 | int ftpgetput_main(int argc UNUSED_PARAM, char **argv)
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317 | {
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318 | const char *port = "ftp";
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319 | /* socket to ftp server */
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320 |
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321 | #if ENABLE_FTPPUT && !ENABLE_FTPGET
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322 | # define ftp_action ftp_send
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323 | #elif ENABLE_FTPGET && !ENABLE_FTPPUT
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324 | # define ftp_action ftp_receive
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325 | #else
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326 | int (*ftp_action)(const char *, char *) = ftp_send;
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327 |
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328 | /* Check to see if the command is ftpget or ftput */
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329 | if (applet_name[3] == 'g') {
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330 | ftp_action = ftp_receive;
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331 | }
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332 | #endif
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333 |
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334 | INIT_G();
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335 | /* Set default values */
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336 | user = "anonymous";
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337 | password = "busybox@";
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338 |
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339 | /*
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340 | * Decipher the command line
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341 | */
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342 | #if ENABLE_FEATURE_FTPGETPUT_LONG_OPTIONS
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343 | applet_long_options = ftpgetput_longopts;
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344 | #endif
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345 | opt_complementary = "-2:vv:cc"; /* must have 2 to 3 params; -v and -c count */
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346 | getopt32(argv, "cvu:p:P:", &user, &password, &port,
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347 | &verbose_flag, &do_continue);
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348 | argv += optind;
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349 |
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350 | /* We want to do exactly _one_ DNS lookup, since some
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351 | * sites (i.e. ftp.us.debian.org) use round-robin DNS
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352 | * and we want to connect to only one IP... */
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353 | lsa = xhost2sockaddr(argv[0], bb_lookup_port(port, "tcp", 21));
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354 | if (verbose_flag) {
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355 | printf("Connecting to %s (%s)\n", argv[0],
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356 | xmalloc_sockaddr2dotted(&lsa->u.sa));
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357 | }
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358 |
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359 | ftp_login();
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360 | return ftp_action(argv[1], argv[2] ? argv[2] : argv[1]);
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361 | }
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