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 //config:config MAKEMIME
  10 //config:       bool "makemime (5.6 kb)"
  11 //config:       default y
  12 //config:       help
  13 //config:       Create MIME-formatted messages.
  14
  15 //applet:IF_MAKEMIME(APPLET(makemime, BB_DIR_BIN, BB_SUID_DROP))
  16
  17 //kbuild:lib-$(CONFIG_MAKEMIME) += makemime.o mail.o
  18
  19 #include "libbb.h"
  20 #include "mail.h"
  21
  22 #if 0
  23 # define dbg_error_msg(...) bb_error_msg(__VA_ARGS__)
  24 #else
  25 # define dbg_error_msg(...) ((void)0)
  26 #endif
  27
  28 /*
  29   makemime -c type [-o file] [-e encoding] [-C charset] [-N name] \
  30                    [-a "Header: Contents"] file
  31            -m [ type ] [-o file] [-e encoding] [-a "Header: Contents"] file
  32            -j [-o file] file1 file2
  33            @file
  34
  35    file:  filename    - read or write from filename
  36           -           - read or write from stdin or stdout
  37           &n          - read or write from file descriptor n
  38           \( opts \)  - read from child process, that generates [ opts ]
  39
  40 Options:
  41   -c type         - create a new MIME section from "file" with this
  42                     Content-Type: (default is application/octet-stream).
  43   -C charset      - MIME charset of a new text/plain section.
  44   -N name         - MIME content name of the new mime section.
  45   -m [ type ]     - create a multipart mime section from "file" of this
  46                     Content-Type: (default is multipart/mixed).
  47   -e encoding     - use the given encoding (7bit, 8bit, quoted-printable,
  48                     or base64), instead of guessing.  Omit "-e" and use
  49                     -c auto to set Content-Type: to text/plain or
  50                     application/octet-stream based on picked encoding.
  51   -j file1 file2  - join mime section file2 to multipart section file1.
  52   -o file         - write the result to file, instead of stdout (not
  53                     allowed in child processes).
  54   -a header       - prepend an additional header to the output.
  55
  56   @file - read all of the above options from file, one option or
  57           value on each line.
  58   {which version of makemime is this? What do we support?}
  59 */
  60 /* man makemime:
  61
  62  * -c TYPE: create a (non-multipart) MIME section with Content-Type: TYPE
  63  * makemime -c TYPE [-e ENCODING] [-o OUTFILE] [-C CHARSET] [-N NAME] [-a HEADER...] FILE
  64  * The -C option sets the MIME charset attribute for text/plain content.
  65  * The -N option sets the name attribute for Content-Type:
  66  * Encoding must be one of the following: 7bit, 8bit, quoted-printable, or base64.
  67
  68  * -m multipart/TYPE: create a multipart MIME collection with Content-Type: multipart/TYPE
  69  * makemime -m multipart/TYPE [-e ENCODING] [-o OUTFILE] [-a HEADER...] FILE
  70  * Type must be either "multipart/mixed", "multipart/alternative", or some other MIME multipart content type.
  71  * Additionally, encoding can only be "7bit" or "8bit", and will default to "8bit" if not specified.
  72  * Finally, filename must be a MIME-formatted section, NOT a regular file.
  73  * The -m option creates an initial multipart MIME collection, that contains only one MIME section, taken from filename.
  74  * The collection is written to standard output, or the pipe or to outputfile.
  75
  76  * -j FILE1: add a section to a multipart MIME collection
  77  * makemime -j FILE1 [-o OUTFILE] FILE2
  78  * FILE1 must be a MIME collection that was previously created by the -m option.
  79  * FILE2 must be a MIME section that was previously created by the -c option.
  80  * The -j options adds the MIME section in FILE2 to the MIME collection in FILE1.
  81  */
  82
  83
  84 /* In busybox 1.15.0.svn, makemime generates output like this
  85  * (empty lines are shown exactly!):
  86 {headers added with -a HDR}
  87 Mime-Version: 1.0
  88 Content-Type: multipart/mixed; boundary="24269534-2145583448-1655890676"
  89
  90 --24269534-2145583448-1655890676
  91 Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
  92 Content-Disposition: inline; filename="A"
  93 Content-Transfer-Encoding: base64
  94
  95 ...file A contents...
  96 --24269534-2145583448-1655890676
  97 Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
  98 Content-Disposition: inline; filename="B"
  99 Content-Transfer-Encoding: base64
 100
 101 ...file B contents...
 102 --24269534-2145583448-1655890676--
 103
 104  *
 105  * For reference: here is an example email to LKML which has
 106  * 1st unnamed part (so it serves as an email body)
 107  * and one attached file:
 108 ...other headers...
 109 Content-Type: multipart/mixed; boundary="=-tOfTf3byOS0vZgxEWcX+"
 110 ...other headers...
 111 Mime-Version: 1.0
 112 ...other headers...
 113
 114
 115 --=-tOfTf3byOS0vZgxEWcX+
 116 Content-Type: text/plain
 117 Content-Transfer-Encoding: 7bit
 118
 119 ...email text...
 120 ...email text...
 121
 122
 123 --=-tOfTf3byOS0vZgxEWcX+
 124 Content-Disposition: attachment; filename="xyz"
 125 Content-Type: text/plain; name="xyz"; charset="UTF-8"
 126 Content-Transfer-Encoding: 7bit
 127
 128 ...file contents...
 129 ...file contents...
 130
 131 --=-tOfTf3byOS0vZgxEWcX+--
 132
 133 ...random junk added by mailing list robots and such...
 134 */
 135
 136 //usage:#define makemime_trivial_usage
 137 //usage:       "[OPTIONS] [FILE]..."
 138 //usage:#define makemime_full_usage "\n\n"
 139 //usage:       "Create multipart MIME-encoded message from FILEs\n"
 140 /* //usage:    "Transfer encoding is base64, disposition is inline (not attachment)\n" */
 141 //usage:     "\n        -o FILE Output. Default: stdout"
 142 //usage:     "\n        -a HDR  Add header(s). Examples:"
 143 //usage:     "\n                \"From: user@host.org\", \"Date: `date -R`\""
 144 //usage:     "\n        -c CT   Content type. Default: application/octet-stream"
 145 //usage:     "\n        -C CS   Charset. Default: " CONFIG_FEATURE_MIME_CHARSET
 146 /* //usage:  "\n        -e ENC  Transfer encoding. Ignored. base64 is assumed" */
 147 //usage:     "\n"
 148 //usage:     "\nOther options are silently ignored"
 149
 150 /*
 151  * -c [Content-Type] should create just one MIME section
 152  * with "Content-Type:", "Content-Transfer-Encoding:", and HDRs from "-a HDR".
 153  * NB: without "Content-Disposition:" auto-added, unlike we do now
 154  * NB2: -c has *optional* param which nevertheless _can_ be specified after a space :(
 155  *
 156  * -m [multipart/mixed] should create multipart MIME section
 157  * with "Content-Type:", "Content-Transfer-Encoding:", and HDRs from "-a HDR",
 158  * and add FILE to it _verbatim_:
 159  *  HEADERS
 160  *
 161  *  --=_1_1321709112_1605
 162  *  FILE_CONTENTS
 163  *  --=_1_1321709112_1605
 164  * without any encoding of FILE_CONTENTS. (Basically, it expects that FILE
 165  * is the result of "makemime -c").
 166  *
 167  * -j MULTIPART_FILE1 SINGLE_FILE2 should output MULTIPART_FILE1 + SINGLE_FILE2
 168  *
 169  * Our current behavior is a mutant "-m + -c + -j" one: we create multipart MIME
 170  * and we put "-c" encoded FILEs into many multipart sections.
 171  */
 172
 173 int makemime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 174 int makemime_main(int argc UNUSED_PARAM, char **argv)
 175 {
 176         unsigned opts;
 177         llist_t *opt_headers = NULL, *l;
 178         const char *opt_output;
 179         const char *content_type = "application/octet-stream";
 180 #define boundary opt_output
 181         enum {
 182                 OPT_c = 1 << 0,         // create (non-multipart) section
 183                 OPT_e = 1 << 1,         // Content-Transfer-Encoding. Ignored. Assumed base64
 184                 OPT_o = 1 << 2,         // output to
 185                 OPT_C = 1 << 3,         // charset
 186                 OPT_N = 1 << 4,         // COMPAT
 187                 OPT_a = 1 << 5,         // additional headers
 188                 //OPT_m = 1 << 6,         // create mutipart section
 189                 //OPT_j = 1 << 7,         // join section to multipart section
 190         };
 191
 192         INIT_G();
 193
 194         // parse options
 195         opts = getopt32(argv,
 196                 "c:e:o:C:N:a:*", // "m:j:",
 197                 &content_type, NULL, &opt_output, &G.opt_charset, NULL, &opt_headers //, NULL, NULL
 198         );
 199         //argc -= optind;
 200         argv += optind;
 201
 202         // respect -o output
 203         if (opts & OPT_o)
 204                 freopen(opt_output, "w", stdout);
 205
 206         // no files given on command line? -> use stdin
 207         if (!*argv)
 208                 *--argv = (char *)"-";
 209
 210         // put additional headers
 211         for (l = opt_headers; l; l = l->link)
 212                 puts(l->data);
 213
 214         // make a random string -- it will delimit message parts
 215         srand(monotonic_us());
 216         boundary = xasprintf("%u-%u-%u",
 217                         (unsigned)rand(), (unsigned)rand(), (unsigned)rand());
 218
 219         // put multipart header
 220         printf(
 221                 "Mime-Version: 1.0\n"
 222                 "Content-Type: multipart/mixed; boundary=\"%s\"\n"
 223                 , boundary
 224         );
 225
 226         // put attachments
 227         while (*argv) {
 228                 printf(
 229                         "\n--%s\n"
 230                         "Content-Type: %s; charset=%s\n"
 231                         "Content-Disposition: inline; filename=\"%s\"\n"
 232                         "Content-Transfer-Encoding: base64\n"
 233                         , boundary
 234                         , content_type
 235                         , G.opt_charset
 236                         , bb_get_last_path_component_strip(*argv)
 237                 );
 238                 printfile_base64(*argv++);
 239         }
 240
 241         // put multipart footer
 242         printf("\n--%s--\n" "\n", boundary);
 243
 244         return EXIT_SUCCESS;
 245 #undef boundary
 246 }