1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * makemime: create MIME-encoded message
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4 | *
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5 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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6 | *
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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | //kbuild:lib-$(CONFIG_MAKEMIME) += makemime.o mail.o
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11 |
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12 | #include "libbb.h"
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13 | #include "mail.h"
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14 |
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15 | #if 0
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16 | # define dbg_error_msg(...) bb_error_msg(__VA_ARGS__)
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17 | #else
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18 | # define dbg_error_msg(...) ((void)0)
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19 | #endif
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20 |
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21 | /*
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22 | makemime -c type [-o file] [-e encoding] [-C charset] [-N name] \
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23 | [-a "Header: Contents"] file
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24 | -m [ type ] [-o file] [-e encoding] [-a "Header: Contents"] file
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25 | -j [-o file] file1 file2
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26 | @file
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27 |
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28 | file: filename - read or write from filename
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29 | - - read or write from stdin or stdout
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30 | &n - read or write from file descriptor n
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31 | \( opts \) - read from child process, that generates [ opts ]
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32 |
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33 | Options:
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34 | -c type - create a new MIME section from "file" with this
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35 | Content-Type: (default is application/octet-stream).
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36 | -C charset - MIME charset of a new text/plain section.
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37 | -N name - MIME content name of the new mime section.
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38 | -m [ type ] - create a multipart mime section from "file" of this
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39 | Content-Type: (default is multipart/mixed).
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40 | -e encoding - use the given encoding (7bit, 8bit, quoted-printable,
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41 | or base64), instead of guessing. Omit "-e" and use
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42 | -c auto to set Content-Type: to text/plain or
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43 | application/octet-stream based on picked encoding.
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44 | -j file1 file2 - join mime section file2 to multipart section file1.
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45 | -o file - write the result to file, instead of stdout (not
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46 | allowed in child processes).
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47 | -a header - prepend an additional header to the output.
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48 |
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49 | @file - read all of the above options from file, one option or
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50 | value on each line.
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51 | {which version of makemime is this? What do we support?}
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52 | */
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53 | /* man makemime:
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54 |
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55 | * -c TYPE: create a (non-multipart) MIME section with Content-Type: TYPE
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56 | * makemime -c TYPE [-e ENCODING] [-o OUTFILE] [-C CHARSET] [-N NAME] [-a HEADER...] FILE
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57 | * The -C option sets the MIME charset attribute for text/plain content.
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58 | * The -N option sets the name attribute for Content-Type:
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59 | * Encoding must be one of the following: 7bit, 8bit, quoted-printable, or base64.
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60 |
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61 | * -m multipart/TYPE: create a multipart MIME collection with Content-Type: multipart/TYPE
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62 | * makemime -m multipart/TYPE [-e ENCODING] [-o OUTFILE] [-a HEADER...] FILE
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63 | * Type must be either "multipart/mixed", "multipart/alternative", or some other MIME multipart content type.
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64 | * Additionally, encoding can only be "7bit" or "8bit", and will default to "8bit" if not specified.
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65 | * Finally, filename must be a MIME-formatted section, NOT a regular file.
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66 | * The -m option creates an initial multipart MIME collection, that contains only one MIME section, taken from filename.
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67 | * The collection is written to standard output, or the pipe or to outputfile.
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68 |
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69 | * -j FILE1: add a section to a multipart MIME collection
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70 | * makemime -j FILE1 [-o OUTFILE] FILE2
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71 | * FILE1 must be a MIME collection that was previously created by the -m option.
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72 | * FILE2 must be a MIME section that was previously created by the -c option.
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73 | * The -j options adds the MIME section in FILE2 to the MIME collection in FILE1.
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74 | */
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75 |
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76 |
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77 | /* In busybox 1.15.0.svn, makemime generates output like this
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78 | * (empty lines are shown exactly!):
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79 | {headers added with -a HDR}
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80 | Mime-Version: 1.0
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81 | Content-Type: multipart/mixed; boundary="24269534-2145583448-1655890676"
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82 |
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83 | --24269534-2145583448-1655890676
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84 | Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
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85 | Content-Disposition: inline; filename="A"
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86 | Content-Transfer-Encoding: base64
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87 |
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88 | ...file A contents...
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89 | --24269534-2145583448-1655890676
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90 | Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
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91 | Content-Disposition: inline; filename="B"
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92 | Content-Transfer-Encoding: base64
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93 |
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94 | ...file B contents...
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95 | --24269534-2145583448-1655890676--
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96 |
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97 | *
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98 | * For reference: here is an example email to LKML which has
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99 | * 1st unnamed part (so it serves as an email body)
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100 | * and one attached file:
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101 | ...other headers...
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102 | Content-Type: multipart/mixed; boundary="=-tOfTf3byOS0vZgxEWcX+"
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103 | ...other headers...
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104 | Mime-Version: 1.0
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105 | ...other headers...
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106 |
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107 |
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108 | --=-tOfTf3byOS0vZgxEWcX+
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109 | Content-Type: text/plain
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110 | Content-Transfer-Encoding: 7bit
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111 |
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112 | ...email text...
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113 | ...email text...
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114 |
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115 |
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116 | --=-tOfTf3byOS0vZgxEWcX+
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117 | Content-Disposition: attachment; filename="xyz"
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118 | Content-Type: text/plain; name="xyz"; charset="UTF-8"
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119 | Content-Transfer-Encoding: 7bit
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120 |
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121 | ...file contents...
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122 | ...file contents...
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123 |
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124 | --=-tOfTf3byOS0vZgxEWcX+--
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125 |
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126 | ...random junk added by mailing list robots and such...
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127 | */
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128 |
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129 | //usage:#define makemime_trivial_usage
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130 | //usage: "[OPTIONS] [FILE]..."
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131 | //usage:#define makemime_full_usage "\n\n"
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132 | //usage: "Create multipart MIME-encoded message from FILEs\n"
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133 | /* //usage: "Transfer encoding is base64, disposition is inline (not attachment)\n" */
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134 | //usage: "\n -o FILE Output. Default: stdout"
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135 | //usage: "\n -a HDR Add header(s). Examples:"
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136 | //usage: "\n \"From: user@host.org\", \"Date: `date -R`\""
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137 | //usage: "\n -c CT Content type. Default: application/octet-stream"
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138 | //usage: "\n -C CS Charset. Default: " CONFIG_FEATURE_MIME_CHARSET
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139 | /* //usage: "\n -e ENC Transfer encoding. Ignored. base64 is assumed" */
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140 | //usage: "\n"
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141 | //usage: "\nOther options are silently ignored"
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142 |
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143 | /*
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144 | * -c [Content-Type] should create just one MIME section
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145 | * with "Content-Type:", "Content-Transfer-Encoding:", and HDRs from "-a HDR".
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146 | * NB: without "Content-Disposition:" auto-added, unlike we do now
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147 | * NB2: -c has *optional* param which nevertheless _can_ be specified after a space :(
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148 | *
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149 | * -m [multipart/mixed] should create multipart MIME section
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150 | * with "Content-Type:", "Content-Transfer-Encoding:", and HDRs from "-a HDR",
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151 | * and add FILE to it _verbatim_:
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152 | * HEADERS
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153 | *
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154 | * --=_1_1321709112_1605
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155 | * FILE_CONTENTS
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156 | * --=_1_1321709112_1605
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157 | * without any encoding of FILE_CONTENTS. (Basically, it expects that FILE
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158 | * is the result of "makemime -c").
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159 | *
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160 | * -j MULTIPART_FILE1 SINGLE_FILE2 should output MULTIPART_FILE1 + SINGLE_FILE2
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161 | *
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162 | * Our current behavior is a mutant "-m + -c + -j" one: we create multipart MIME
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163 | * and we put "-c" encoded FILEs into many multipart sections.
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164 | */
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165 |
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166 | int makemime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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167 | int makemime_main(int argc UNUSED_PARAM, char **argv)
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168 | {
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169 | llist_t *opt_headers = NULL, *l;
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170 | const char *opt_output;
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171 | const char *content_type = "application/octet-stream";
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172 | #define boundary opt_output
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173 | enum {
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174 | OPT_c = 1 << 0, // create (non-multipart) section
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175 | OPT_e = 1 << 1, // Content-Transfer-Encoding. Ignored. Assumed base64
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176 | OPT_o = 1 << 2, // output to
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177 | OPT_C = 1 << 3, // charset
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178 | OPT_N = 1 << 4, // COMPAT
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179 | OPT_a = 1 << 5, // additional headers
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180 | //OPT_m = 1 << 6, // create mutipart section
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181 | //OPT_j = 1 << 7, // join section to multipart section
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182 | };
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183 |
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184 | INIT_G();
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185 |
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186 | // parse options
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187 | opt_complementary = "a::";
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188 | opts = getopt32(argv,
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189 | "c:e:o:C:N:a:", // "m:j:",
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190 | &content_type, NULL, &opt_output, &G.opt_charset, NULL, &opt_headers //, NULL, NULL
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191 | );
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192 | //argc -= optind;
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193 | argv += optind;
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194 |
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195 | // respect -o output
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196 | if (opts & OPT_o)
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197 | freopen(opt_output, "w", stdout);
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198 |
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199 | // no files given on command line? -> use stdin
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200 | if (!*argv)
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201 | *--argv = (char *)"-";
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202 |
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203 | // put additional headers
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204 | for (l = opt_headers; l; l = l->link)
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205 | puts(l->data);
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206 |
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207 | // make a random string -- it will delimit message parts
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208 | srand(monotonic_us());
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209 | boundary = xasprintf("%u-%u-%u",
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210 | (unsigned)rand(), (unsigned)rand(), (unsigned)rand());
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211 |
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212 | // put multipart header
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213 | printf(
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214 | "Mime-Version: 1.0\n"
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215 | "Content-Type: multipart/mixed; boundary=\"%s\"\n"
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216 | , boundary
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217 | );
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218 |
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219 | // put attachments
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220 | while (*argv) {
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221 | printf(
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222 | "\n--%s\n"
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223 | "Content-Type: %s; charset=%s\n"
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224 | "Content-Disposition: inline; filename=\"%s\"\n"
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225 | "Content-Transfer-Encoding: base64\n"
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226 | , boundary
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227 | , content_type
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228 | , G.opt_charset
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229 | , bb_get_last_path_component_strip(*argv)
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230 | );
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231 | encode_base64(*argv++, (const char *)stdin, "");
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232 | }
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233 |
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234 | // put multipart footer
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235 | printf("\n--%s--\n" "\n", boundary);
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236 |
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237 | return EXIT_SUCCESS;
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238 | #undef boundary
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239 | }
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