release/src/router/busybox/mailutils/makemime.c

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