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 | * reformime: parse MIME-encoded message
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5 | *
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6 | * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
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7 | *
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8 | * Licensed under GPLv2, see file LICENSE in this source tree.
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9 | */
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10 | #include "libbb.h"
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11 | #include "mail.h"
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12 |
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13 | /*
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14 | makemime -c type [-o file] [-e encoding] [-C charset] [-N name] \
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15 | [-a "Header: Contents"] file
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16 | -m [ type ] [-o file] [-e encoding] [-a "Header: Contents"] file
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17 | -j [-o file] file1 file2
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18 | @file
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19 |
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20 | file: filename - read or write from filename
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21 | - - read or write from stdin or stdout
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22 | &n - read or write from file descriptor n
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23 | \( opts \) - read from child process, that generates [ opts ]
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24 |
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25 | Options:
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26 |
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27 | -c type - create a new MIME section from "file" with this
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28 | Content-Type: (default is application/octet-stream).
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29 | -C charset - MIME charset of a new text/plain section.
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30 | -N name - MIME content name of the new mime section.
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31 | -m [ type ] - create a multipart mime section from "file" of this
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32 | Content-Type: (default is multipart/mixed).
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33 | -e encoding - use the given encoding (7bit, 8bit, quoted-printable,
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34 | or base64), instead of guessing. Omit "-e" and use
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35 | -c auto to set Content-Type: to text/plain or
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36 | application/octet-stream based on picked encoding.
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37 | -j file1 file2 - join mime section file2 to multipart section file1.
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38 | -o file - write the result to file, instead of stdout (not
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39 | allowed in child processes).
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40 | -a header - prepend an additional header to the output.
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41 |
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42 | @file - read all of the above options from file, one option or
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43 | value on each line.
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44 | {which version of makemime is this? What do we support?}
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45 | */
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46 |
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47 |
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48 | /* In busybox 1.15.0.svn, makemime generates output like this
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49 | * (empty lines are shown exactly!):
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50 | {headers added with -a HDR}
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51 | Mime-Version: 1.0
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52 | Content-Type: multipart/mixed; boundary="24269534-2145583448-1655890676"
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53 |
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54 | --24269534-2145583448-1655890676
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55 | Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
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56 | Content-Disposition: inline; filename="A"
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57 | Content-Transfer-Encoding: base64
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58 |
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59 | ...file A contents...
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60 | --24269534-2145583448-1655890676
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61 | Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
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62 | Content-Disposition: inline; filename="B"
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63 | Content-Transfer-Encoding: base64
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64 |
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65 | ...file B contents...
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66 | --24269534-2145583448-1655890676--
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67 |
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68 | */
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69 |
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70 |
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71 | /* For reference: here is an example email to LKML which has
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72 | * 1st unnamed part (so it serves as an email body)
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73 | * and one attached file:
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74 | ...other headers...
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75 | Content-Type: multipart/mixed; boundary="=-tOfTf3byOS0vZgxEWcX+"
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76 | ...other headers...
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77 | Mime-Version: 1.0
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78 | ...other headers...
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79 |
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80 |
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81 | --=-tOfTf3byOS0vZgxEWcX+
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82 | Content-Type: text/plain
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83 | Content-Transfer-Encoding: 7bit
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84 |
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85 | ...email text...
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86 | ...email text...
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87 |
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88 |
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89 | --=-tOfTf3byOS0vZgxEWcX+
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90 | Content-Disposition: attachment; filename="xyz"
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91 | Content-Type: text/plain; name="xyz"; charset="UTF-8"
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92 | Content-Transfer-Encoding: 7bit
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93 |
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94 | ...file contents...
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95 | ...file contents...
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96 |
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97 | --=-tOfTf3byOS0vZgxEWcX+--
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98 |
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99 | ...random junk added by mailing list robots and such...
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100 | */
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101 |
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102 | int makemime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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103 | int makemime_main(int argc UNUSED_PARAM, char **argv)
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104 | {
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105 | llist_t *opt_headers = NULL, *l;
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106 | const char *opt_output;
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107 | #define boundary opt_output
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108 |
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109 | enum {
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110 | OPT_c = 1 << 0, // Content-Type:
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111 | OPT_e = 1 << 1, // Content-Transfer-Encoding. Ignored. Assumed base64
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112 | OPT_o = 1 << 2, // output to
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113 | OPT_C = 1 << 3, // charset
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114 | OPT_N = 1 << 4, // COMPAT
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115 | OPT_a = 1 << 5, // additional headers
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116 | OPT_m = 1 << 6, // COMPAT
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117 | OPT_j = 1 << 7, // COMPAT
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118 | };
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119 |
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120 | INIT_G();
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121 |
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122 | // parse options
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123 | opt_complementary = "a::";
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124 | opts = getopt32(argv,
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125 | "c:e:o:C:N:a:m:j:",
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126 | &G.content_type, NULL, &opt_output, &G.opt_charset, NULL, &opt_headers, NULL, NULL
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127 | );
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128 | //argc -= optind;
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129 | argv += optind;
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130 |
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131 | // respect -o output
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132 | if (opts & OPT_o)
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133 | freopen(opt_output, "w", stdout);
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134 |
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135 | // no files given on command line? -> use stdin
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136 | if (!*argv)
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137 | *--argv = (char *)"-";
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138 |
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139 | // put additional headers
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140 | for (l = opt_headers; l; l = l->link)
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141 | puts(l->data);
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142 |
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143 | // make a random string -- it will delimit message parts
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144 | srand(monotonic_us());
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145 | boundary = xasprintf("%u-%u-%u",
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146 | (unsigned)rand(), (unsigned)rand(), (unsigned)rand());
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147 |
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148 | // put multipart header
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149 | printf(
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150 | "Mime-Version: 1.0\n"
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151 | "Content-Type: multipart/mixed; boundary=\"%s\"\n"
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152 | , boundary
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153 | );
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154 |
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155 | // put attachments
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156 | while (*argv) {
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157 | printf(
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158 | "\n--%s\n"
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159 | "Content-Type: %s; charset=%s\n"
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160 | "Content-Disposition: inline; filename=\"%s\"\n"
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161 | "Content-Transfer-Encoding: base64\n"
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162 | , boundary
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163 | , G.content_type
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164 | , G.opt_charset
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165 | , bb_get_last_path_component_strip(*argv)
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166 | );
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167 | encode_base64(*argv++, (const char *)stdin, "");
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168 | }
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169 |
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170 | // put multipart footer
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171 | printf("\n--%s--\n" "\n", boundary);
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172 |
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173 | return EXIT_SUCCESS;
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174 | #undef boundary
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175 | }
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176 |
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177 | static const char *find_token(const char *const string_array[], const char *key, const char *defvalue)
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178 | {
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179 | const char *r = NULL;
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180 | int i;
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181 | for (i = 0; string_array[i] != NULL; i++) {
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182 | if (strcasecmp(string_array[i], key) == 0) {
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183 | r = (char *)string_array[i+1];
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184 | break;
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185 | }
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186 | }
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187 | return (r) ? r : defvalue;
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188 | }
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189 |
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190 | static const char *xfind_token(const char *const string_array[], const char *key)
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191 | {
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192 | const char *r = find_token(string_array, key, NULL);
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193 | if (r)
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194 | return r;
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195 | bb_error_msg_and_die("header: %s", key);
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196 | }
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197 |
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198 | enum {
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199 | OPT_x = 1 << 0,
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200 | OPT_X = 1 << 1,
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201 | #if ENABLE_FEATURE_REFORMIME_COMPAT
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202 | OPT_d = 1 << 2,
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203 | OPT_e = 1 << 3,
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204 | OPT_i = 1 << 4,
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205 | OPT_s = 1 << 5,
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206 | OPT_r = 1 << 6,
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207 | OPT_c = 1 << 7,
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208 | OPT_m = 1 << 8,
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209 | OPT_h = 1 << 9,
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210 | OPT_o = 1 << 10,
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211 | OPT_O = 1 << 11,
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212 | #endif
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213 | };
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214 |
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215 | static int parse(const char *boundary, char **argv)
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216 | {
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217 | char *line, *s, *p;
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218 | const char *type;
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219 | int boundary_len = strlen(boundary);
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220 | const char *delims = " ;\"\t\r\n";
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221 | const char *uniq;
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222 | int ntokens;
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223 | const char *tokens[32]; // 32 is enough
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224 |
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225 | // prepare unique string pattern
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226 | uniq = xasprintf("%%llu.%u.%s", (unsigned)getpid(), safe_gethostname());
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227 |
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228 | //bb_info_msg("PARSE[%s]", uniq);
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229 |
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230 | while ((line = xmalloc_fgets_str(stdin, "\r\n\r\n")) != NULL) {
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231 |
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232 | // seek to start of MIME section
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233 | // N.B. to avoid false positives let us seek to the _last_ occurance
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234 | p = NULL;
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235 | s = line;
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236 | while ((s = strcasestr(s, "Content-Type:")) != NULL)
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237 | p = s++;
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238 | if (!p)
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239 | goto next;
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240 | //bb_info_msg("L[%s]", p);
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241 |
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242 | // split to tokens
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243 | // TODO: strip of comments which are of form: (comment-text)
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244 | ntokens = 0;
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245 | tokens[ntokens] = NULL;
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246 | for (s = strtok(p, delims); s; s = strtok(NULL, delims)) {
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247 | tokens[ntokens] = s;
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248 | if (ntokens < ARRAY_SIZE(tokens) - 1)
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249 | ntokens++;
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250 | //bb_info_msg("L[%d][%s]", ntokens, s);
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251 | }
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252 | tokens[ntokens] = NULL;
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253 | //bb_info_msg("N[%d]", ntokens);
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254 |
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255 | // analyse tokens
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256 | type = find_token(tokens, "Content-Type:", "text/plain");
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257 | //bb_info_msg("T[%s]", type);
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258 | if (0 == strncasecmp(type, "multipart/", 10)) {
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259 | if (0 == strcasecmp(type+10, "mixed")) {
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260 | parse(xfind_token(tokens, "boundary="), argv);
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261 | } else
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262 | bb_error_msg_and_die("no support of content type '%s'", type);
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263 | } else {
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264 | pid_t pid = pid;
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265 | int rc;
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266 | FILE *fp;
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267 | // fetch charset
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268 | const char *charset = find_token(tokens, "charset=", CONFIG_FEATURE_MIME_CHARSET);
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269 | // fetch encoding
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270 | const char *encoding = find_token(tokens, "Content-Transfer-Encoding:", "7bit");
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271 | // compose target filename
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272 | char *filename = (char *)find_token(tokens, "filename=", NULL);
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273 | if (!filename)
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274 | filename = xasprintf(uniq, monotonic_us());
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275 | else
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276 | filename = bb_get_last_path_component_strip(xstrdup(filename));
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277 |
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278 | // start external helper, if any
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279 | if (opts & OPT_X) {
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280 | int fd[2];
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281 | xpipe(fd);
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282 | pid = vfork();
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283 | if (0 == pid) {
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284 | // child reads from fd[0]
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285 | close(fd[1]);
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286 | xmove_fd(fd[0], STDIN_FILENO);
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287 | xsetenv("CONTENT_TYPE", type);
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288 | xsetenv("CHARSET", charset);
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289 | xsetenv("ENCODING", encoding);
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290 | xsetenv("FILENAME", filename);
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291 | BB_EXECVP_or_die(argv);
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292 | }
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293 | // parent dumps to fd[1]
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294 | close(fd[0]);
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295 | fp = xfdopen_for_write(fd[1]);
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296 | signal(SIGPIPE, SIG_IGN); // ignore EPIPE
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297 | // or create a file for dump
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298 | } else {
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299 | char *fname = xasprintf("%s%s", *argv, filename);
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300 | fp = xfopen_for_write(fname);
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301 | free(fname);
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302 | }
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303 |
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304 | // housekeeping
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305 | free(filename);
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306 |
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307 | // dump to fp
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308 | if (0 == strcasecmp(encoding, "base64")) {
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309 | read_base64(stdin, fp, '-');
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310 | } else if (0 != strcasecmp(encoding, "7bit")
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311 | && 0 != strcasecmp(encoding, "8bit")
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312 | ) {
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313 | // quoted-printable, binary, user-defined are unsupported so far
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314 | bb_error_msg_and_die("no support of encoding '%s'", encoding);
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315 | } else {
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316 | // N.B. we have written redundant \n. so truncate the file
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317 | // The following weird 2-tacts reading technique is due to
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318 | // we have to not write extra \n at the end of the file
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319 | // In case of -x option we could truncate the resulting file as
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320 | // fseek(fp, -1, SEEK_END);
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321 | // if (ftruncate(fileno(fp), ftell(fp)))
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322 | // bb_perror_msg("ftruncate");
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323 | // But in case of -X we have to be much more careful. There is
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324 | // no means to truncate what we already have sent to the helper.
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325 | p = xmalloc_fgets_str(stdin, "\r\n");
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326 | while (p) {
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327 | s = xmalloc_fgets_str(stdin, "\r\n");
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328 | if (s == NULL)
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329 | break;
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330 | if ('-' == s[0]
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331 | && '-' == s[1]
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332 | && 0 == strncmp(s+2, boundary, boundary_len)
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333 | ) {
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334 | break;
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335 | }
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336 | fputs(p, fp);
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337 | p = s;
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338 | }
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339 |
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340 | /*
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341 | while ((s = xmalloc_fgetline_str(stdin, "\r\n")) != NULL) {
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342 | if ('-' == s[0] && '-' == s[1]
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343 | && 0 == strncmp(s+2, boundary, boundary_len))
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344 | break;
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345 | fprintf(fp, "%s\n", s);
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346 | }
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347 | // N.B. we have written redundant \n. so truncate the file
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348 | fseek(fp, -1, SEEK_END);
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349 | if (ftruncate(fileno(fp), ftell(fp)))
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350 | bb_perror_msg("ftruncate");
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351 | */
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352 | }
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353 | fclose(fp);
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354 |
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355 | // finalize helper
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356 | if (opts & OPT_X) {
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357 | signal(SIGPIPE, SIG_DFL);
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358 | // exit if helper exited >0
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359 | rc = (wait4pid(pid) & 0xff);
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360 | if (rc)
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361 | return rc+20;
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362 | }
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363 |
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364 | // check multipart finalized
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365 | if (s && '-' == s[2+boundary_len] && '-' == s[2+boundary_len+1]) {
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366 | free(line);
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367 | break;
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368 | }
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369 | }
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370 | next:
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371 | free(line);
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372 | }
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373 |
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374 | //bb_info_msg("ENDPARSE[%s]", boundary);
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375 |
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376 | return EXIT_SUCCESS;
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377 | }
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378 |
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379 | /*
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380 | Usage: reformime [options]
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381 | -d - parse a delivery status notification.
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382 | -e - extract contents of MIME section.
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383 | -x - extract MIME section to a file.
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384 | -X - pipe MIME section to a program.
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385 | -i - show MIME info.
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386 | -s n.n.n.n - specify MIME section.
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387 | -r - rewrite message, filling in missing MIME headers.
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388 | -r7 - also convert 8bit/raw encoding to quoted-printable, if possible.
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389 | -r8 - also convert quoted-printable encoding to 8bit, if possible.
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390 | -c charset - default charset for rewriting, -o, and -O.
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391 | -m [file] [file]... - create a MIME message digest.
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392 | -h "header" - decode RFC 2047-encoded header.
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393 | -o "header" - encode unstructured header using RFC 2047.
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394 | -O "header" - encode address list header using RFC 2047.
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395 | */
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396 |
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397 | int reformime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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398 | int reformime_main(int argc UNUSED_PARAM, char **argv)
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399 | {
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400 | const char *opt_prefix = "";
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401 |
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402 | INIT_G();
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403 |
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404 | // parse options
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405 | // N.B. only -x and -X are supported so far
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406 | opt_complementary = "x--X:X--x" IF_FEATURE_REFORMIME_COMPAT(":m::");
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407 | opts = getopt32(argv,
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408 | "x:X" IF_FEATURE_REFORMIME_COMPAT("deis:r:c:m:h:o:O:"),
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409 | &opt_prefix
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410 | IF_FEATURE_REFORMIME_COMPAT(, NULL, NULL, &G.opt_charset, NULL, NULL, NULL, NULL)
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411 | );
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412 | //argc -= optind;
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413 | argv += optind;
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414 |
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415 | return parse("", (opts & OPT_X) ? argv : (char **)&opt_prefix);
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416 | }
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