1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * wget - retrieve a file using HTTP or FTP
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4 | *
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5 | * Chip Rosenthal Covad Communications <chip@laserlink.net>
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6 | * Licensed under GPLv2, see file LICENSE in this source tree.
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7 | *
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8 | * Copyright (C) 2010 Bradley M. Kuhn <bkuhn@ebb.org>
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9 | * Kuhn's copyrights are licensed GPLv2-or-later. File as a whole remains GPLv2.
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10 | */
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11 |
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12 | //usage:#define wget_trivial_usage
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13 | //usage: IF_FEATURE_WGET_LONG_OPTIONS(
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14 | //usage: "[-c|--continue] [-s|--spider] [-q|--quiet] [-O|--output-document FILE]\n"
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15 | //usage: " [--header 'header: value'] [-Y|--proxy on/off] [-P DIR]\n"
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16 | /* Since we ignore these opts, we don't show them in --help */
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17 | /* //usage: " [--no-check-certificate] [--no-cache]" */
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18 | //usage: " [-U|--user-agent AGENT]" IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
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19 | //usage: )
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20 | //usage: IF_NOT_FEATURE_WGET_LONG_OPTIONS(
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21 | //usage: "[-csq] [-O FILE] [-Y on/off] [-P DIR] [-U AGENT]"
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22 | //usage: IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
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23 | //usage: )
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24 | //usage:#define wget_full_usage "\n\n"
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25 | //usage: "Retrieve files via HTTP or FTP\n"
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26 | //usage: "\n -s Spider mode - only check file existence"
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27 | //usage: "\n -c Continue retrieval of aborted transfer"
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28 | //usage: "\n -q Quiet"
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29 | //usage: "\n -P DIR Save to DIR (default .)"
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30 | //usage: IF_FEATURE_WGET_TIMEOUT(
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31 | //usage: "\n -T SEC Network read timeout is SEC seconds"
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32 | //usage: )
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33 | //usage: "\n -O FILE Save to FILE ('-' for stdout)"
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34 | //usage: "\n -U STR Use STR for User-Agent header"
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35 | //usage: "\n -Y Use proxy ('on' or 'off')"
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36 |
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37 | #include "libbb.h"
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38 |
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39 | #if 0
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40 | # define log_io(...) bb_error_msg(__VA_ARGS__)
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41 | #else
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42 | # define log_io(...) ((void)0)
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43 | #endif
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44 |
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45 |
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46 | struct host_info {
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47 | char *allocated;
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48 | const char *path;
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49 | const char *user;
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50 | char *host;
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51 | int port;
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52 | smallint is_ftp;
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53 | };
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54 |
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55 |
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56 | /* Globals */
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57 | struct globals {
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58 | off_t content_len; /* Content-length of the file */
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59 | off_t beg_range; /* Range at which continue begins */
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60 | #if ENABLE_FEATURE_WGET_STATUSBAR
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61 | off_t transferred; /* Number of bytes transferred so far */
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62 | const char *curfile; /* Name of current file being transferred */
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63 | bb_progress_t pmt;
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64 | #endif
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65 | char *dir_prefix;
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66 | #if ENABLE_FEATURE_WGET_LONG_OPTIONS
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67 | char *post_data;
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68 | char *extra_headers;
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69 | #endif
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70 | char *fname_out; /* where to direct output (-O) */
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71 | const char *proxy_flag; /* Use proxies if env vars are set */
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72 | const char *user_agent; /* "User-Agent" header field */
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73 | #if ENABLE_FEATURE_WGET_TIMEOUT
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74 | unsigned timeout_seconds;
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75 | #endif
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76 | int output_fd;
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77 | int o_flags;
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78 | smallint chunked; /* chunked transfer encoding */
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79 | smallint got_clen; /* got content-length: from server */
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80 | /* Local downloads do benefit from big buffer.
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81 | * With 512 byte buffer, it was measured to be
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82 | * an order of magnitude slower than with big one.
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83 | */
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84 | uint64_t just_to_align_next_member;
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85 | char wget_buf[CONFIG_FEATURE_COPYBUF_KB*1024];
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86 | } FIX_ALIASING;
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87 | #define G (*ptr_to_globals)
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88 | #define INIT_G() do { \
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89 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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90 | IF_FEATURE_WGET_TIMEOUT(G.timeout_seconds = 900;) \
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91 | } while (0)
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92 |
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93 |
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94 | /* Must match option string! */
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95 | enum {
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96 | WGET_OPT_CONTINUE = (1 << 0),
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97 | WGET_OPT_SPIDER = (1 << 1),
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98 | WGET_OPT_QUIET = (1 << 2),
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99 | WGET_OPT_OUTNAME = (1 << 3),
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100 | WGET_OPT_PREFIX = (1 << 4),
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101 | WGET_OPT_PROXY = (1 << 5),
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102 | WGET_OPT_USER_AGENT = (1 << 6),
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103 | WGET_OPT_NETWORK_READ_TIMEOUT = (1 << 7),
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104 | WGET_OPT_RETRIES = (1 << 8),
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105 | WGET_OPT_PASSIVE = (1 << 9),
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106 | WGET_OPT_HEADER = (1 << 10) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
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107 | WGET_OPT_POST_DATA = (1 << 11) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
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108 | };
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109 |
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110 | enum {
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111 | PROGRESS_START = -1,
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112 | PROGRESS_END = 0,
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113 | PROGRESS_BUMP = 1,
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114 | };
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115 | #if ENABLE_FEATURE_WGET_STATUSBAR
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116 | static void progress_meter(int flag)
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117 | {
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118 | if (option_mask32 & WGET_OPT_QUIET)
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119 | return;
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120 |
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121 | if (flag == PROGRESS_START)
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122 | bb_progress_init(&G.pmt, G.curfile);
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123 |
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124 | bb_progress_update(&G.pmt,
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125 | G.beg_range,
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126 | G.transferred,
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127 | (G.chunked || !G.got_clen) ? 0 : G.beg_range + G.transferred + G.content_len
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128 | );
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129 |
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130 | if (flag == PROGRESS_END) {
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131 | bb_progress_free(&G.pmt);
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132 | bb_putchar_stderr('\n');
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133 | G.transferred = 0;
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134 | }
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135 | }
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136 | #else
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137 | static ALWAYS_INLINE void progress_meter(int flag UNUSED_PARAM) { }
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138 | #endif
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139 |
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140 |
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141 | /* IPv6 knows scoped address types i.e. link and site local addresses. Link
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142 | * local addresses can have a scope identifier to specify the
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143 | * interface/link an address is valid on (e.g. fe80::1%eth0). This scope
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144 | * identifier is only valid on a single node.
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145 | *
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146 | * RFC 4007 says that the scope identifier MUST NOT be sent across the wire,
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147 | * unless all nodes agree on the semantic. Apache e.g. regards zone identifiers
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148 | * in the Host header as invalid requests, see
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149 | * https://issues.apache.org/bugzilla/show_bug.cgi?id=35122
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150 | */
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151 | static void strip_ipv6_scope_id(char *host)
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152 | {
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153 | char *scope, *cp;
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154 |
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155 | /* bbox wget actually handles IPv6 addresses without [], like
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156 | * wget "http://::1/xxx", but this is not standard.
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157 | * To save code, _here_ we do not support it. */
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158 |
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159 | if (host[0] != '[')
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160 | return; /* not IPv6 */
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161 |
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162 | scope = strchr(host, '%');
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163 | if (!scope)
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164 | return;
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165 |
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166 | /* Remove the IPv6 zone identifier from the host address */
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167 | cp = strchr(host, ']');
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168 | if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
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169 | /* malformed address (not "[xx]:nn" or "[xx]") */
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170 | return;
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171 | }
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172 |
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173 | /* cp points to "]...", scope points to "%eth0]..." */
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174 | overlapping_strcpy(scope, cp);
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175 | }
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176 |
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177 | #if ENABLE_FEATURE_WGET_AUTHENTICATION
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178 | /* Base64-encode character string. */
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179 | static char *base64enc(const char *str)
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180 | {
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181 | unsigned len = strlen(str);
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182 | if (len > sizeof(G.wget_buf)/4*3 - 10) /* paranoia */
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183 | len = sizeof(G.wget_buf)/4*3 - 10;
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184 | bb_uuencode(G.wget_buf, str, len, bb_uuenc_tbl_base64);
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185 | return G.wget_buf;
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186 | }
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187 | #endif
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188 |
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189 | static char* sanitize_string(char *s)
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190 | {
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191 | unsigned char *p = (void *) s;
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192 | while (*p >= ' ')
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193 | p++;
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194 | *p = '\0';
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195 | return s;
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196 | }
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197 |
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198 | static FILE *open_socket(len_and_sockaddr *lsa)
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199 | {
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200 | FILE *fp;
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201 |
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202 | /* glibc 2.4 seems to try seeking on it - ??! */
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203 | /* hopefully it understands what ESPIPE means... */
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204 | fp = fdopen(xconnect_stream(lsa), "r+");
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205 | if (fp == NULL)
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206 | bb_perror_msg_and_die(bb_msg_memory_exhausted);
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207 |
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208 | return fp;
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209 | }
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210 |
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211 | /* Returns '\n' if it was seen, else '\0'. Trims at first '\r' or '\n' */
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212 | static char fgets_and_trim(FILE *fp)
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213 | {
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214 | char c;
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215 | char *buf_ptr;
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216 |
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217 | if (fgets(G.wget_buf, sizeof(G.wget_buf) - 1, fp) == NULL)
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218 | bb_perror_msg_and_die("error getting response");
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219 |
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220 | buf_ptr = strchrnul(G.wget_buf, '\n');
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221 | c = *buf_ptr;
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222 | *buf_ptr = '\0';
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223 | buf_ptr = strchrnul(G.wget_buf, '\r');
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224 | *buf_ptr = '\0';
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225 |
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226 | log_io("< %s", G.wget_buf);
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227 |
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228 | return c;
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229 | }
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230 |
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231 | static int ftpcmd(const char *s1, const char *s2, FILE *fp)
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232 | {
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233 | int result;
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234 | if (s1) {
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235 | if (!s2)
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236 | s2 = "";
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237 | fprintf(fp, "%s%s\r\n", s1, s2);
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238 | fflush(fp);
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239 | log_io("> %s%s", s1, s2);
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240 | }
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241 |
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242 | do {
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243 | fgets_and_trim(fp);
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244 | } while (!isdigit(G.wget_buf[0]) || G.wget_buf[3] != ' ');
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245 |
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246 | G.wget_buf[3] = '\0';
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247 | result = xatoi_positive(G.wget_buf);
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248 | G.wget_buf[3] = ' ';
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249 | return result;
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250 | }
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251 |
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252 | static void parse_url(const char *src_url, struct host_info *h)
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253 | {
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254 | char *url, *p, *sp;
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255 |
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256 | free(h->allocated);
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257 | h->allocated = url = xstrdup(src_url);
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258 |
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259 | if (strncmp(url, "http://", 7) == 0) {
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260 | h->port = bb_lookup_port("http", "tcp", 80);
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261 | h->host = url + 7;
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262 | h->is_ftp = 0;
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263 | } else if (strncmp(url, "ftp://", 6) == 0) {
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264 | h->port = bb_lookup_port("ftp", "tcp", 21);
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265 | h->host = url + 6;
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266 | h->is_ftp = 1;
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267 | } else
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268 | bb_error_msg_and_die("not an http or ftp url: %s", sanitize_string(url));
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269 |
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270 | // FYI:
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271 | // "Real" wget 'http://busybox.net?var=a/b' sends this request:
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272 | // 'GET /?var=a/b HTTP 1.0'
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273 | // and saves 'index.html?var=a%2Fb' (we save 'b')
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274 | // wget 'http://busybox.net?login=john@doe':
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275 | // request: 'GET /?login=john@doe HTTP/1.0'
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276 | // saves: 'index.html?login=john@doe' (we save '?login=john@doe')
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277 | // wget 'http://busybox.net#test/test':
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278 | // request: 'GET / HTTP/1.0'
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279 | // saves: 'index.html' (we save 'test')
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280 | //
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281 | // We also don't add unique .N suffix if file exists...
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282 | sp = strchr(h->host, '/');
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283 | p = strchr(h->host, '?'); if (!sp || (p && sp > p)) sp = p;
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284 | p = strchr(h->host, '#'); if (!sp || (p && sp > p)) sp = p;
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285 | if (!sp) {
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286 | h->path = "";
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287 | } else if (*sp == '/') {
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288 | *sp = '\0';
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289 | h->path = sp + 1;
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290 | } else { // '#' or '?'
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291 | // http://busybox.net?login=john@doe is a valid URL
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292 | // memmove converts to:
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293 | // http:/busybox.nett?login=john@doe...
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294 | memmove(h->host - 1, h->host, sp - h->host);
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295 | h->host--;
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296 | sp[-1] = '\0';
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297 | h->path = sp;
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298 | }
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299 |
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300 | // We used to set h->user to NULL here, but this interferes
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301 | // with handling of code 302 ("object was moved")
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302 |
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303 | sp = strrchr(h->host, '@');
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304 | if (sp != NULL) {
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305 | // URL-decode "user:password" string before base64-encoding:
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306 | // wget http://test:my%20pass@example.com should send
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307 | // Authorization: Basic dGVzdDpteSBwYXNz
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308 | // which decodes to "test:my pass".
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309 | // Standard wget and curl do this too.
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310 | *sp = '\0';
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311 | h->user = percent_decode_in_place(h->host, /*strict:*/ 0);
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312 | h->host = sp + 1;
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313 | }
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314 |
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315 | sp = h->host;
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316 | }
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317 |
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318 | static char *gethdr(FILE *fp)
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319 | {
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320 | char *s, *hdrval;
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321 | int c;
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322 |
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323 | /* retrieve header line */
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324 | c = fgets_and_trim(fp);
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325 |
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326 | /* end of the headers? */
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327 | if (G.wget_buf[0] == '\0')
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328 | return NULL;
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329 |
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330 | /* convert the header name to lower case */
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331 | for (s = G.wget_buf; isalnum(*s) || *s == '-' || *s == '.'; ++s) {
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332 | /* tolower for "A-Z", no-op for "0-9a-z-." */
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333 | *s |= 0x20;
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334 | }
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335 |
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336 | /* verify we are at the end of the header name */
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337 | if (*s != ':')
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338 | bb_error_msg_and_die("bad header line: %s", sanitize_string(G.wget_buf));
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339 |
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340 | /* locate the start of the header value */
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341 | *s++ = '\0';
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342 | hdrval = skip_whitespace(s);
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343 |
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344 | if (c != '\n') {
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345 | /* Rats! The buffer isn't big enough to hold the entire header value */
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346 | while (c = getc(fp), c != EOF && c != '\n')
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347 | continue;
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348 | }
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349 |
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350 | return hdrval;
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351 | }
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352 |
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353 | static void reset_beg_range_to_zero(void)
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354 | {
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355 | bb_error_msg("restart failed");
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356 | G.beg_range = 0;
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357 | xlseek(G.output_fd, 0, SEEK_SET);
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358 | /* Done at the end instead: */
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359 | /* ftruncate(G.output_fd, 0); */
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360 | }
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361 |
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362 | static FILE* prepare_ftp_session(FILE **dfpp, struct host_info *target, len_and_sockaddr *lsa)
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363 | {
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364 | FILE *sfp;
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365 | char *str;
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366 | int port;
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367 |
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368 | if (!target->user)
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369 | target->user = xstrdup("anonymous:busybox@");
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370 |
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371 | sfp = open_socket(lsa);
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372 | if (ftpcmd(NULL, NULL, sfp) != 220)
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373 | bb_error_msg_and_die("%s", sanitize_string(G.wget_buf + 4));
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374 |
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375 | /*
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376 | * Splitting username:password pair,
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377 | * trying to log in
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378 | */
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379 | str = strchr(target->user, ':');
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380 | if (str)
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381 | *str++ = '\0';
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382 | switch (ftpcmd("USER ", target->user, sfp)) {
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383 | case 230:
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384 | break;
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385 | case 331:
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386 | if (ftpcmd("PASS ", str, sfp) == 230)
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387 | break;
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388 | /* fall through (failed login) */
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389 | default:
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390 | bb_error_msg_and_die("ftp login: %s", sanitize_string(G.wget_buf + 4));
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391 | }
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392 |
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393 | ftpcmd("TYPE I", NULL, sfp);
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394 |
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395 | /*
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396 | * Querying file size
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397 | */
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398 | if (ftpcmd("SIZE ", target->path, sfp) == 213) {
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399 | G.content_len = BB_STRTOOFF(G.wget_buf + 4, NULL, 10);
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400 | if (G.content_len < 0 || errno) {
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401 | bb_error_msg_and_die("SIZE value is garbage");
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402 | }
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403 | G.got_clen = 1;
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404 | }
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405 |
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406 | /*
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407 | * Entering passive mode
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408 | */
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409 | if (ftpcmd("PASV", NULL, sfp) != 227) {
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410 | pasv_error:
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411 | bb_error_msg_and_die("bad response to %s: %s", "PASV", sanitize_string(G.wget_buf));
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412 | }
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413 | // Response is "227 garbageN1,N2,N3,N4,P1,P2[)garbage]
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414 | // Server's IP is N1.N2.N3.N4 (we ignore it)
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415 | // Server's port for data connection is P1*256+P2
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416 | str = strrchr(G.wget_buf, ')');
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417 | if (str) str[0] = '\0';
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418 | str = strrchr(G.wget_buf, ',');
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419 | if (!str) goto pasv_error;
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420 | port = xatou_range(str+1, 0, 255);
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421 | *str = '\0';
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422 | str = strrchr(G.wget_buf, ',');
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423 | if (!str) goto pasv_error;
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424 | port += xatou_range(str+1, 0, 255) * 256;
|
---|
425 | set_nport(&lsa->u.sa, htons(port));
|
---|
426 |
|
---|
427 | *dfpp = open_socket(lsa);
|
---|
428 |
|
---|
429 | if (G.beg_range != 0) {
|
---|
430 | sprintf(G.wget_buf, "REST %"OFF_FMT"u", G.beg_range);
|
---|
431 | if (ftpcmd(G.wget_buf, NULL, sfp) == 350)
|
---|
432 | G.content_len -= G.beg_range;
|
---|
433 | else
|
---|
434 | reset_beg_range_to_zero();
|
---|
435 | }
|
---|
436 |
|
---|
437 | if (ftpcmd("RETR ", target->path, sfp) > 150)
|
---|
438 | bb_error_msg_and_die("bad response to %s: %s", "RETR", sanitize_string(G.wget_buf));
|
---|
439 |
|
---|
440 | return sfp;
|
---|
441 | }
|
---|
442 |
|
---|
443 | static void NOINLINE retrieve_file_data(FILE *dfp)
|
---|
444 | {
|
---|
445 | #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
|
---|
446 | # if ENABLE_FEATURE_WGET_TIMEOUT
|
---|
447 | unsigned second_cnt = G.timeout_seconds;
|
---|
448 | # endif
|
---|
449 | struct pollfd polldata;
|
---|
450 |
|
---|
451 | polldata.fd = fileno(dfp);
|
---|
452 | polldata.events = POLLIN | POLLPRI;
|
---|
453 | #endif
|
---|
454 | progress_meter(PROGRESS_START);
|
---|
455 |
|
---|
456 | if (G.chunked)
|
---|
457 | goto get_clen;
|
---|
458 |
|
---|
459 | /* Loops only if chunked */
|
---|
460 | while (1) {
|
---|
461 |
|
---|
462 | #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
|
---|
463 | /* Must use nonblocking I/O, otherwise fread will loop
|
---|
464 | * and *block* until it reads full buffer,
|
---|
465 | * which messes up progress bar and/or timeout logic.
|
---|
466 | * Because of nonblocking I/O, we need to dance
|
---|
467 | * very carefully around EAGAIN. See explanation at
|
---|
468 | * clearerr() calls.
|
---|
469 | */
|
---|
470 | ndelay_on(polldata.fd);
|
---|
471 | #endif
|
---|
472 | while (1) {
|
---|
473 | int n;
|
---|
474 | unsigned rdsz;
|
---|
475 |
|
---|
476 | #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
|
---|
477 | /* fread internally uses read loop, which in our case
|
---|
478 | * is usually exited when we get EAGAIN.
|
---|
479 | * In this case, libc sets error marker on the stream.
|
---|
480 | * Need to clear it before next fread to avoid possible
|
---|
481 | * rare false positive ferror below. Rare because usually
|
---|
482 | * fread gets more than zero bytes, and we don't fall
|
---|
483 | * into if (n <= 0) ...
|
---|
484 | */
|
---|
485 | clearerr(dfp);
|
---|
486 | #endif
|
---|
487 | errno = 0;
|
---|
488 | rdsz = sizeof(G.wget_buf);
|
---|
489 | if (G.got_clen) {
|
---|
490 | if (G.content_len < (off_t)sizeof(G.wget_buf)) {
|
---|
491 | if ((int)G.content_len <= 0)
|
---|
492 | break;
|
---|
493 | rdsz = (unsigned)G.content_len;
|
---|
494 | }
|
---|
495 | }
|
---|
496 | n = fread(G.wget_buf, 1, rdsz, dfp);
|
---|
497 |
|
---|
498 | if (n > 0) {
|
---|
499 | xwrite(G.output_fd, G.wget_buf, n);
|
---|
500 | #if ENABLE_FEATURE_WGET_STATUSBAR
|
---|
501 | G.transferred += n;
|
---|
502 | #endif
|
---|
503 | if (G.got_clen) {
|
---|
504 | G.content_len -= n;
|
---|
505 | if (G.content_len == 0)
|
---|
506 | break;
|
---|
507 | }
|
---|
508 | #if ENABLE_FEATURE_WGET_TIMEOUT
|
---|
509 | second_cnt = G.timeout_seconds;
|
---|
510 | #endif
|
---|
511 | continue;
|
---|
512 | }
|
---|
513 |
|
---|
514 | /* n <= 0.
|
---|
515 | * man fread:
|
---|
516 | * If error occurs, or EOF is reached, the return value
|
---|
517 | * is a short item count (or zero).
|
---|
518 | * fread does not distinguish between EOF and error.
|
---|
519 | */
|
---|
520 | if (errno != EAGAIN) {
|
---|
521 | if (ferror(dfp)) {
|
---|
522 | progress_meter(PROGRESS_END);
|
---|
523 | bb_perror_msg_and_die(bb_msg_read_error);
|
---|
524 | }
|
---|
525 | break; /* EOF, not error */
|
---|
526 | }
|
---|
527 |
|
---|
528 | #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
|
---|
529 | /* It was EAGAIN. There is no data. Wait up to one second
|
---|
530 | * then abort if timed out, or update the bar and try reading again.
|
---|
531 | */
|
---|
532 | if (safe_poll(&polldata, 1, 1000) == 0) {
|
---|
533 | # if ENABLE_FEATURE_WGET_TIMEOUT
|
---|
534 | if (second_cnt != 0 && --second_cnt == 0) {
|
---|
535 | progress_meter(PROGRESS_END);
|
---|
536 | bb_error_msg_and_die("download timed out");
|
---|
537 | }
|
---|
538 | # endif
|
---|
539 | /* We used to loop back to poll here,
|
---|
540 | * but there is no great harm in letting fread
|
---|
541 | * to try reading anyway.
|
---|
542 | */
|
---|
543 | }
|
---|
544 | /* Need to do it _every_ second for "stalled" indicator
|
---|
545 | * to be shown properly.
|
---|
546 | */
|
---|
547 | progress_meter(PROGRESS_BUMP);
|
---|
548 | #endif
|
---|
549 | } /* while (reading data) */
|
---|
550 |
|
---|
551 | #if ENABLE_FEATURE_WGET_STATUSBAR || ENABLE_FEATURE_WGET_TIMEOUT
|
---|
552 | clearerr(dfp);
|
---|
553 | ndelay_off(polldata.fd); /* else fgets can get very unhappy */
|
---|
554 | #endif
|
---|
555 | if (!G.chunked)
|
---|
556 | break;
|
---|
557 |
|
---|
558 | fgets_and_trim(dfp); /* Eat empty line */
|
---|
559 | get_clen:
|
---|
560 | fgets_and_trim(dfp);
|
---|
561 | G.content_len = STRTOOFF(G.wget_buf, NULL, 16);
|
---|
562 | /* FIXME: error check? */
|
---|
563 | if (G.content_len == 0)
|
---|
564 | break; /* all done! */
|
---|
565 | G.got_clen = 1;
|
---|
566 | /*
|
---|
567 | * Note that fgets may result in some data being buffered in dfp.
|
---|
568 | * We loop back to fread, which will retrieve this data.
|
---|
569 | * Also note that code has to be arranged so that fread
|
---|
570 | * is done _before_ one-second poll wait - poll doesn't know
|
---|
571 | * about stdio buffering and can result in spurious one second waits!
|
---|
572 | */
|
---|
573 | }
|
---|
574 |
|
---|
575 | /* If -c failed, we restart from the beginning,
|
---|
576 | * but we do not truncate file then, we do it only now, at the end.
|
---|
577 | * This lets user to ^C if his 99% complete 10 GB file download
|
---|
578 | * failed to restart *without* losing the almost complete file.
|
---|
579 | */
|
---|
580 | {
|
---|
581 | off_t pos = lseek(G.output_fd, 0, SEEK_CUR);
|
---|
582 | if (pos != (off_t)-1)
|
---|
583 | ftruncate(G.output_fd, pos);
|
---|
584 | }
|
---|
585 |
|
---|
586 | /* Draw full bar and free its resources */
|
---|
587 | G.chunked = 0; /* makes it show 100% even for chunked download */
|
---|
588 | G.got_clen = 1; /* makes it show 100% even for download of (formerly) unknown size */
|
---|
589 | progress_meter(PROGRESS_END);
|
---|
590 | }
|
---|
591 |
|
---|
592 | static void download_one_url(const char *url)
|
---|
593 | {
|
---|
594 | bool use_proxy; /* Use proxies if env vars are set */
|
---|
595 | int redir_limit;
|
---|
596 | len_and_sockaddr *lsa;
|
---|
597 | FILE *sfp; /* socket to web/ftp server */
|
---|
598 | FILE *dfp; /* socket to ftp server (data) */
|
---|
599 | char *proxy = NULL;
|
---|
600 | char *fname_out_alloc;
|
---|
601 | char *redirected_path = NULL;
|
---|
602 | struct host_info server;
|
---|
603 | struct host_info target;
|
---|
604 |
|
---|
605 | server.allocated = NULL;
|
---|
606 | target.allocated = NULL;
|
---|
607 | server.user = NULL;
|
---|
608 | target.user = NULL;
|
---|
609 |
|
---|
610 | parse_url(url, &target);
|
---|
611 |
|
---|
612 | /* Use the proxy if necessary */
|
---|
613 | use_proxy = (strcmp(G.proxy_flag, "off") != 0);
|
---|
614 | if (use_proxy) {
|
---|
615 | proxy = getenv(target.is_ftp ? "ftp_proxy" : "http_proxy");
|
---|
616 | use_proxy = (proxy && proxy[0]);
|
---|
617 | if (use_proxy)
|
---|
618 | parse_url(proxy, &server);
|
---|
619 | }
|
---|
620 | if (!use_proxy) {
|
---|
621 | server.port = target.port;
|
---|
622 | if (ENABLE_FEATURE_IPV6) {
|
---|
623 | //free(server.allocated); - can't be non-NULL
|
---|
624 | server.host = server.allocated = xstrdup(target.host);
|
---|
625 | } else {
|
---|
626 | server.host = target.host;
|
---|
627 | }
|
---|
628 | }
|
---|
629 |
|
---|
630 | if (ENABLE_FEATURE_IPV6)
|
---|
631 | strip_ipv6_scope_id(target.host);
|
---|
632 |
|
---|
633 | /* If there was no -O FILE, guess output filename */
|
---|
634 | fname_out_alloc = NULL;
|
---|
635 | if (!(option_mask32 & WGET_OPT_OUTNAME)) {
|
---|
636 | G.fname_out = bb_get_last_path_component_nostrip(target.path);
|
---|
637 | /* handle "wget http://kernel.org//" */
|
---|
638 | if (G.fname_out[0] == '/' || !G.fname_out[0])
|
---|
639 | G.fname_out = (char*)"index.html";
|
---|
640 | /* -P DIR is considered only if there was no -O FILE */
|
---|
641 | if (G.dir_prefix)
|
---|
642 | G.fname_out = fname_out_alloc = concat_path_file(G.dir_prefix, G.fname_out);
|
---|
643 | else {
|
---|
644 | /* redirects may free target.path later, need to make a copy */
|
---|
645 | G.fname_out = fname_out_alloc = xstrdup(G.fname_out);
|
---|
646 | }
|
---|
647 | }
|
---|
648 | #if ENABLE_FEATURE_WGET_STATUSBAR
|
---|
649 | G.curfile = bb_get_last_path_component_nostrip(G.fname_out);
|
---|
650 | #endif
|
---|
651 |
|
---|
652 | /* Determine where to start transfer */
|
---|
653 | G.beg_range = 0;
|
---|
654 | if (option_mask32 & WGET_OPT_CONTINUE) {
|
---|
655 | G.output_fd = open(G.fname_out, O_WRONLY);
|
---|
656 | if (G.output_fd >= 0) {
|
---|
657 | G.beg_range = xlseek(G.output_fd, 0, SEEK_END);
|
---|
658 | }
|
---|
659 | /* File doesn't exist. We do not create file here yet.
|
---|
660 | * We are not sure it exists on remote side */
|
---|
661 | }
|
---|
662 |
|
---|
663 | redir_limit = 5;
|
---|
664 | resolve_lsa:
|
---|
665 | lsa = xhost2sockaddr(server.host, server.port);
|
---|
666 | if (!(option_mask32 & WGET_OPT_QUIET)) {
|
---|
667 | char *s = xmalloc_sockaddr2dotted(&lsa->u.sa);
|
---|
668 | fprintf(stderr, "Connecting to %s (%s)\n", server.host, s);
|
---|
669 | free(s);
|
---|
670 | }
|
---|
671 | establish_session:
|
---|
672 | /*G.content_len = 0; - redundant, got_clen = 0 is enough */
|
---|
673 | G.got_clen = 0;
|
---|
674 | G.chunked = 0;
|
---|
675 | if (use_proxy || !target.is_ftp) {
|
---|
676 | /*
|
---|
677 | * HTTP session
|
---|
678 | */
|
---|
679 | char *str;
|
---|
680 | int status;
|
---|
681 |
|
---|
682 |
|
---|
683 | /* Open socket to http server */
|
---|
684 | sfp = open_socket(lsa);
|
---|
685 |
|
---|
686 | /* Send HTTP request */
|
---|
687 | if (use_proxy) {
|
---|
688 | fprintf(sfp, "GET %stp://%s/%s HTTP/1.1\r\n",
|
---|
689 | target.is_ftp ? "f" : "ht", target.host,
|
---|
690 | target.path);
|
---|
691 | } else {
|
---|
692 | if (option_mask32 & WGET_OPT_POST_DATA)
|
---|
693 | fprintf(sfp, "POST /%s HTTP/1.1\r\n", target.path);
|
---|
694 | else
|
---|
695 | fprintf(sfp, "GET /%s HTTP/1.1\r\n", target.path);
|
---|
696 | }
|
---|
697 |
|
---|
698 | fprintf(sfp, "Host: %s\r\nUser-Agent: %s\r\n",
|
---|
699 | target.host, G.user_agent);
|
---|
700 |
|
---|
701 | /* Ask server to close the connection as soon as we are done
|
---|
702 | * (IOW: we do not intend to send more requests)
|
---|
703 | */
|
---|
704 | fprintf(sfp, "Connection: close\r\n");
|
---|
705 |
|
---|
706 | #if ENABLE_FEATURE_WGET_AUTHENTICATION
|
---|
707 | if (target.user) {
|
---|
708 | fprintf(sfp, "Proxy-Authorization: Basic %s\r\n"+6,
|
---|
709 | base64enc(target.user));
|
---|
710 | }
|
---|
711 | if (use_proxy && server.user) {
|
---|
712 | fprintf(sfp, "Proxy-Authorization: Basic %s\r\n",
|
---|
713 | base64enc(server.user));
|
---|
714 | }
|
---|
715 | #endif
|
---|
716 |
|
---|
717 | if (G.beg_range != 0)
|
---|
718 | fprintf(sfp, "Range: bytes=%"OFF_FMT"u-\r\n", G.beg_range);
|
---|
719 |
|
---|
720 | #if ENABLE_FEATURE_WGET_LONG_OPTIONS
|
---|
721 | if (G.extra_headers)
|
---|
722 | fputs(G.extra_headers, sfp);
|
---|
723 |
|
---|
724 | if (option_mask32 & WGET_OPT_POST_DATA) {
|
---|
725 | fprintf(sfp,
|
---|
726 | "Content-Type: application/x-www-form-urlencoded\r\n"
|
---|
727 | "Content-Length: %u\r\n"
|
---|
728 | "\r\n"
|
---|
729 | "%s",
|
---|
730 | (int) strlen(G.post_data), G.post_data
|
---|
731 | );
|
---|
732 | } else
|
---|
733 | #endif
|
---|
734 | {
|
---|
735 | fprintf(sfp, "\r\n");
|
---|
736 | }
|
---|
737 |
|
---|
738 | fflush(sfp);
|
---|
739 |
|
---|
740 | /*
|
---|
741 | * Retrieve HTTP response line and check for "200" status code.
|
---|
742 | */
|
---|
743 | read_response:
|
---|
744 | fgets_and_trim(sfp);
|
---|
745 |
|
---|
746 | str = G.wget_buf;
|
---|
747 | str = skip_non_whitespace(str);
|
---|
748 | str = skip_whitespace(str);
|
---|
749 | // FIXME: no error check
|
---|
750 | // xatou wouldn't work: "200 OK"
|
---|
751 | status = atoi(str);
|
---|
752 | switch (status) {
|
---|
753 | case 0:
|
---|
754 | case 100:
|
---|
755 | while (gethdr(sfp) != NULL)
|
---|
756 | /* eat all remaining headers */;
|
---|
757 | goto read_response;
|
---|
758 | case 200:
|
---|
759 | /*
|
---|
760 | Response 204 doesn't say "null file", it says "metadata
|
---|
761 | has changed but data didn't":
|
---|
762 |
|
---|
763 | "10.2.5 204 No Content
|
---|
764 | The server has fulfilled the request but does not need to return
|
---|
765 | an entity-body, and might want to return updated metainformation.
|
---|
766 | The response MAY include new or updated metainformation in the form
|
---|
767 | of entity-headers, which if present SHOULD be associated with
|
---|
768 | the requested variant.
|
---|
769 |
|
---|
770 | If the client is a user agent, it SHOULD NOT change its document
|
---|
771 | view from that which caused the request to be sent. This response
|
---|
772 | is primarily intended to allow input for actions to take place
|
---|
773 | without causing a change to the user agent's active document view,
|
---|
774 | although any new or updated metainformation SHOULD be applied
|
---|
775 | to the document currently in the user agent's active view.
|
---|
776 |
|
---|
777 | The 204 response MUST NOT include a message-body, and thus
|
---|
778 | is always terminated by the first empty line after the header fields."
|
---|
779 |
|
---|
780 | However, in real world it was observed that some web servers
|
---|
781 | (e.g. Boa/0.94.14rc21) simply use code 204 when file size is zero.
|
---|
782 | */
|
---|
783 | case 204:
|
---|
784 | if (G.beg_range != 0) {
|
---|
785 | /* "Range:..." was not honored by the server.
|
---|
786 | * Restart download from the beginning.
|
---|
787 | */
|
---|
788 | reset_beg_range_to_zero();
|
---|
789 | }
|
---|
790 | break;
|
---|
791 | case 300: /* redirection */
|
---|
792 | case 301:
|
---|
793 | case 302:
|
---|
794 | case 303:
|
---|
795 | break;
|
---|
796 | case 206: /* Partial Content */
|
---|
797 | if (G.beg_range != 0)
|
---|
798 | /* "Range:..." worked. Good. */
|
---|
799 | break;
|
---|
800 | /* Partial Content even though we did not ask for it??? */
|
---|
801 | /* fall through */
|
---|
802 | default:
|
---|
803 | bb_error_msg_and_die("server returned error: %s", sanitize_string(G.wget_buf));
|
---|
804 | }
|
---|
805 |
|
---|
806 | /*
|
---|
807 | * Retrieve HTTP headers.
|
---|
808 | */
|
---|
809 | while ((str = gethdr(sfp)) != NULL) {
|
---|
810 | static const char keywords[] ALIGN1 =
|
---|
811 | "content-length\0""transfer-encoding\0""location\0";
|
---|
812 | enum {
|
---|
813 | KEY_content_length = 1, KEY_transfer_encoding, KEY_location
|
---|
814 | };
|
---|
815 | smalluint key;
|
---|
816 |
|
---|
817 | /* gethdr converted "FOO:" string to lowercase */
|
---|
818 |
|
---|
819 | /* strip trailing whitespace */
|
---|
820 | char *s = strchrnul(str, '\0') - 1;
|
---|
821 | while (s >= str && (*s == ' ' || *s == '\t')) {
|
---|
822 | *s = '\0';
|
---|
823 | s--;
|
---|
824 | }
|
---|
825 | key = index_in_strings(keywords, G.wget_buf) + 1;
|
---|
826 | if (key == KEY_content_length) {
|
---|
827 | G.content_len = BB_STRTOOFF(str, NULL, 10);
|
---|
828 | if (G.content_len < 0 || errno) {
|
---|
829 | bb_error_msg_and_die("content-length %s is garbage", sanitize_string(str));
|
---|
830 | }
|
---|
831 | G.got_clen = 1;
|
---|
832 | continue;
|
---|
833 | }
|
---|
834 | if (key == KEY_transfer_encoding) {
|
---|
835 | if (strcmp(str_tolower(str), "chunked") != 0)
|
---|
836 | bb_error_msg_and_die("transfer encoding '%s' is not supported", sanitize_string(str));
|
---|
837 | G.chunked = 1;
|
---|
838 | }
|
---|
839 | if (key == KEY_location && status >= 300) {
|
---|
840 | if (--redir_limit == 0)
|
---|
841 | bb_error_msg_and_die("too many redirections");
|
---|
842 | fclose(sfp);
|
---|
843 | if (str[0] == '/') {
|
---|
844 | free(redirected_path);
|
---|
845 | target.path = redirected_path = xstrdup(str+1);
|
---|
846 | /* lsa stays the same: it's on the same server */
|
---|
847 | } else {
|
---|
848 | parse_url(str, &target);
|
---|
849 | if (!use_proxy) {
|
---|
850 | free(server.allocated);
|
---|
851 | server.allocated = NULL;
|
---|
852 | server.host = target.host;
|
---|
853 | /* strip_ipv6_scope_id(target.host); - no! */
|
---|
854 | /* we assume remote never gives us IPv6 addr with scope id */
|
---|
855 | server.port = target.port;
|
---|
856 | free(lsa);
|
---|
857 | goto resolve_lsa;
|
---|
858 | } /* else: lsa stays the same: we use proxy */
|
---|
859 | }
|
---|
860 | goto establish_session;
|
---|
861 | }
|
---|
862 | }
|
---|
863 | // if (status >= 300)
|
---|
864 | // bb_error_msg_and_die("bad redirection (no Location: header from server)");
|
---|
865 |
|
---|
866 | /* For HTTP, data is pumped over the same connection */
|
---|
867 | dfp = sfp;
|
---|
868 |
|
---|
869 | } else {
|
---|
870 | /*
|
---|
871 | * FTP session
|
---|
872 | */
|
---|
873 | sfp = prepare_ftp_session(&dfp, &target, lsa);
|
---|
874 | }
|
---|
875 |
|
---|
876 | free(lsa);
|
---|
877 |
|
---|
878 | if (!(option_mask32 & WGET_OPT_SPIDER)) {
|
---|
879 | if (G.output_fd < 0)
|
---|
880 | G.output_fd = xopen(G.fname_out, G.o_flags);
|
---|
881 | retrieve_file_data(dfp);
|
---|
882 | if (!(option_mask32 & WGET_OPT_OUTNAME)) {
|
---|
883 | xclose(G.output_fd);
|
---|
884 | G.output_fd = -1;
|
---|
885 | }
|
---|
886 | }
|
---|
887 |
|
---|
888 | if (dfp != sfp) {
|
---|
889 | /* It's ftp. Close data connection properly */
|
---|
890 | fclose(dfp);
|
---|
891 | if (ftpcmd(NULL, NULL, sfp) != 226)
|
---|
892 | bb_error_msg_and_die("ftp error: %s", sanitize_string(G.wget_buf + 4));
|
---|
893 | /* ftpcmd("QUIT", NULL, sfp); - why bother? */
|
---|
894 | }
|
---|
895 | fclose(sfp);
|
---|
896 |
|
---|
897 | free(server.allocated);
|
---|
898 | free(target.allocated);
|
---|
899 | free(fname_out_alloc);
|
---|
900 | free(redirected_path);
|
---|
901 | }
|
---|
902 |
|
---|
903 | int wget_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
904 | int wget_main(int argc UNUSED_PARAM, char **argv)
|
---|
905 | {
|
---|
906 | #if ENABLE_FEATURE_WGET_LONG_OPTIONS
|
---|
907 | static const char wget_longopts[] ALIGN1 =
|
---|
908 | /* name, has_arg, val */
|
---|
909 | "continue\0" No_argument "c"
|
---|
910 | //FIXME: -s isn't --spider, it's --save-headers!
|
---|
911 | "spider\0" No_argument "s"
|
---|
912 | "quiet\0" No_argument "q"
|
---|
913 | "output-document\0" Required_argument "O"
|
---|
914 | "directory-prefix\0" Required_argument "P"
|
---|
915 | "proxy\0" Required_argument "Y"
|
---|
916 | "user-agent\0" Required_argument "U"
|
---|
917 | #if ENABLE_FEATURE_WGET_TIMEOUT
|
---|
918 | "timeout\0" Required_argument "T"
|
---|
919 | #endif
|
---|
920 | /* Ignored: */
|
---|
921 | // "tries\0" Required_argument "t"
|
---|
922 | /* Ignored (we always use PASV): */
|
---|
923 | "passive-ftp\0" No_argument "\xff"
|
---|
924 | "header\0" Required_argument "\xfe"
|
---|
925 | "post-data\0" Required_argument "\xfd"
|
---|
926 | /* Ignored (we don't do ssl) */
|
---|
927 | "no-check-certificate\0" No_argument "\xfc"
|
---|
928 | /* Ignored (we don't support caching) */
|
---|
929 | "no-cache\0" No_argument "\xfb"
|
---|
930 | ;
|
---|
931 | #endif
|
---|
932 |
|
---|
933 | #if ENABLE_FEATURE_WGET_LONG_OPTIONS
|
---|
934 | llist_t *headers_llist = NULL;
|
---|
935 | #endif
|
---|
936 |
|
---|
937 | INIT_G();
|
---|
938 |
|
---|
939 | IF_FEATURE_WGET_TIMEOUT(G.timeout_seconds = 900;)
|
---|
940 | G.proxy_flag = "on"; /* use proxies if env vars are set */
|
---|
941 | G.user_agent = "Wget"; /* "User-Agent" header field */
|
---|
942 |
|
---|
943 | #if ENABLE_FEATURE_WGET_LONG_OPTIONS
|
---|
944 | applet_long_options = wget_longopts;
|
---|
945 | #endif
|
---|
946 | opt_complementary = "-1" IF_FEATURE_WGET_TIMEOUT(":T+") IF_FEATURE_WGET_LONG_OPTIONS(":\xfe::");
|
---|
947 | getopt32(argv, "csqO:P:Y:U:T:" /*ignored:*/ "t:",
|
---|
948 | &G.fname_out, &G.dir_prefix,
|
---|
949 | &G.proxy_flag, &G.user_agent,
|
---|
950 | IF_FEATURE_WGET_TIMEOUT(&G.timeout_seconds) IF_NOT_FEATURE_WGET_TIMEOUT(NULL),
|
---|
951 | NULL /* -t RETRIES */
|
---|
952 | IF_FEATURE_WGET_LONG_OPTIONS(, &headers_llist)
|
---|
953 | IF_FEATURE_WGET_LONG_OPTIONS(, &G.post_data)
|
---|
954 | );
|
---|
955 | argv += optind;
|
---|
956 |
|
---|
957 | #if ENABLE_FEATURE_WGET_LONG_OPTIONS
|
---|
958 | if (headers_llist) {
|
---|
959 | int size = 1;
|
---|
960 | char *cp;
|
---|
961 | llist_t *ll = headers_llist;
|
---|
962 | while (ll) {
|
---|
963 | size += strlen(ll->data) + 2;
|
---|
964 | ll = ll->link;
|
---|
965 | }
|
---|
966 | G.extra_headers = cp = xmalloc(size);
|
---|
967 | while (headers_llist) {
|
---|
968 | cp += sprintf(cp, "%s\r\n", (char*)llist_pop(&headers_llist));
|
---|
969 | }
|
---|
970 | }
|
---|
971 | #endif
|
---|
972 |
|
---|
973 | G.output_fd = -1;
|
---|
974 | G.o_flags = O_WRONLY | O_CREAT | O_TRUNC | O_EXCL;
|
---|
975 | if (G.fname_out) { /* -O FILE ? */
|
---|
976 | if (LONE_DASH(G.fname_out)) { /* -O - ? */
|
---|
977 | G.output_fd = 1;
|
---|
978 | option_mask32 &= ~WGET_OPT_CONTINUE;
|
---|
979 | }
|
---|
980 | /* compat with wget: -O FILE can overwrite */
|
---|
981 | G.o_flags = O_WRONLY | O_CREAT | O_TRUNC;
|
---|
982 | }
|
---|
983 |
|
---|
984 | while (*argv)
|
---|
985 | download_one_url(*argv++);
|
---|
986 |
|
---|
987 | if (G.output_fd >= 0)
|
---|
988 | xclose(G.output_fd);
|
---|
989 |
|
---|
990 | return EXIT_SUCCESS;
|
---|
991 | }
|
---|