1 /* vi: set sw=4 ts=4: */
3 * makemime: create MIME-encoded message
4 * reformime: parse MIME-encoded message
6 * Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
8 * Licensed under GPLv2, see file LICENSE in this source tree.
14 makemime -c type [-o file] [-e encoding] [-C charset] [-N name] \
15 [-a "Header: Contents"] file
16 -m [ type ] [-o file] [-e encoding] [-a "Header: Contents"] file
17 -j [-o file] file1 file2
20 file: filename - read or write from filename
21 - - read or write from stdin or stdout
22 &n - read or write from file descriptor n
23 \( opts \) - read from child process, that generates [ opts ]
27 -c type - create a new MIME section from "file" with this
28 Content-Type: (default is application/octet-stream).
29 -C charset - MIME charset of a new text/plain section.
30 -N name - MIME content name of the new mime section.
31 -m [ type ] - create a multipart mime section from "file" of this
32 Content-Type: (default is multipart/mixed).
33 -e encoding - use the given encoding (7bit, 8bit, quoted-printable,
34 or base64), instead of guessing. Omit "-e" and use
35 -c auto to set Content-Type: to text/plain or
36 application/octet-stream based on picked encoding.
37 -j file1 file2 - join mime section file2 to multipart section file1.
38 -o file - write the result to file, instead of stdout (not
39 allowed in child processes).
40 -a header - prepend an additional header to the output.
42 @file - read all of the above options from file, one option or
44 {which version of makemime is this? What do we support?}
48 /* In busybox 1.15.0.svn, makemime generates output like this
49 * (empty lines are shown exactly!):
50 {headers added with -a HDR}
52 Content-Type: multipart/mixed; boundary="24269534-2145583448-1655890676"
54 --24269534-2145583448-1655890676
55 Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
56 Content-Disposition: inline; filename="A"
57 Content-Transfer-Encoding: base64
60 --24269534-2145583448-1655890676
61 Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
62 Content-Disposition: inline; filename="B"
63 Content-Transfer-Encoding: base64
66 --24269534-2145583448-1655890676--
71 /* For reference: here is an example email to LKML which has
72 * 1st unnamed part (so it serves as an email body)
73 * and one attached file:
75 Content-Type: multipart/mixed; boundary="=-tOfTf3byOS0vZgxEWcX+"
81 --=-tOfTf3byOS0vZgxEWcX+
82 Content-Type: text/plain
83 Content-Transfer-Encoding: 7bit
89 --=-tOfTf3byOS0vZgxEWcX+
90 Content-Disposition: attachment; filename="xyz"
91 Content-Type: text/plain; name="xyz"; charset="UTF-8"
92 Content-Transfer-Encoding: 7bit
97 --=-tOfTf3byOS0vZgxEWcX+--
99 ...random junk added by mailing list robots and such...
104 * -c TYPE: create a (non-multipart) MIME section with Content-Type: TYPE
105 * makemime -c TYPE [-e ENCODING] [-o OUTFILE] [-C CHARSET] [-N NAME] [-a HEADER...] FILE
106 * The -C option sets the MIME charset attribute for text/plain content.
107 * The -N option sets the name attribute for Content-Type:
108 * Encoding must be one of the following: 7bit, 8bit, quoted-printable, or base64.
110 * -m multipart/TYPE: create a multipart MIME collection with Content-Type: multipart/TYPE
111 * makemime -m multipart/TYPE [-e ENCODING] [-o OUTFILE] [-a HEADER...] FILE
112 * Type must be either "multipart/mixed", "multipart/alternative", or some other MIME multipart content type.
113 * Additionally, encoding can only be "7bit" or "8bit", and will default to "8bit" if not specified.
114 * Finally, filename must be a MIME-formatted section, NOT a regular file.
115 * The -m option creates an initial multipart MIME collection, that contains only one MIME section, taken from filename.
116 * The collection is written to standard output, or the pipe or to outputfile.
118 * -j FILE1: add a section to a multipart MIME collection
119 * makemime -j FILE1 [-o OUTFILE] FILE2
120 * FILE1 must be a MIME collection that was previously created by the -m option.
121 * FILE2 must be a MIME section that was previously created by the -c option.
122 * The -j options adds the MIME section in FILE2 to the MIME collection in FILE1.
124 int makemime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
125 int makemime_main(int argc UNUSED_PARAM, char **argv)
127 llist_t *opt_headers = NULL, *l;
128 const char *opt_output;
129 #define boundary opt_output
132 OPT_c = 1 << 0, // create (non-multipart) section
133 OPT_e = 1 << 1, // Content-Transfer-Encoding. Ignored. Assumed base64
134 OPT_o = 1 << 2, // output to
135 OPT_C = 1 << 3, // charset
136 OPT_N = 1 << 4, // COMPAT
137 OPT_a = 1 << 5, // additional headers
138 //OPT_m = 1 << 6, // create mutipart section
139 //OPT_j = 1 << 7, // join section to multipart section
145 opt_complementary = "a::";
146 opts = getopt32(argv,
147 "c:e:o:C:N:a", //:m:j:",
148 &G.content_type, NULL, &opt_output, &G.opt_charset, NULL, &opt_headers //, NULL, NULL
155 freopen(opt_output, "w", stdout);
157 // no files given on command line? -> use stdin
159 *--argv = (char *)"-";
161 // put additional headers
162 for (l = opt_headers; l; l = l->link)
165 // make a random string -- it will delimit message parts
166 srand(monotonic_us());
167 boundary = xasprintf("%u-%u-%u",
168 (unsigned)rand(), (unsigned)rand(), (unsigned)rand());
170 // put multipart header
172 "Mime-Version: 1.0\n"
173 "Content-Type: multipart/mixed; boundary=\"%s\"\n"
181 "Content-Type: %s; charset=%s\n"
182 "Content-Disposition: inline; filename=\"%s\"\n"
183 "Content-Transfer-Encoding: base64\n"
187 , bb_get_last_path_component_strip(*argv)
189 encode_base64(*argv++, (const char *)stdin, "");
192 // put multipart footer
193 printf("\n--%s--\n" "\n", boundary);
199 static const char *find_token(const char *const string_array[], const char *key, const char *defvalue)
201 const char *r = NULL;
203 for (i = 0; string_array[i] != NULL; i++) {
204 if (strcasecmp(string_array[i], key) == 0) {
205 r = (char *)string_array[i+1];
209 return (r) ? r : defvalue;
212 static const char *xfind_token(const char *const string_array[], const char *key)
214 const char *r = find_token(string_array, key, NULL);
217 bb_error_msg_and_die("header: %s", key);
223 #if ENABLE_FEATURE_REFORMIME_COMPAT
237 static int parse(const char *boundary, char **argv)
241 int boundary_len = strlen(boundary);
242 const char *delims = " ;\"\t\r\n";
245 const char *tokens[32]; // 32 is enough
247 // prepare unique string pattern
248 uniq = xasprintf("%%llu.%u.%s", (unsigned)getpid(), safe_gethostname());
250 //bb_info_msg("PARSE[%s]", uniq);
252 while ((line = xmalloc_fgets_str(stdin, "\r\n\r\n")) != NULL) {
254 // seek to start of MIME section
255 // N.B. to avoid false positives let us seek to the _last_ occurance
258 while ((s = strcasestr(s, "Content-Type:")) != NULL)
262 //bb_info_msg("L[%s]", p);
265 // TODO: strip of comments which are of form: (comment-text)
267 tokens[ntokens] = NULL;
268 for (s = strtok(p, delims); s; s = strtok(NULL, delims)) {
270 if (ntokens < ARRAY_SIZE(tokens) - 1)
272 //bb_info_msg("L[%d][%s]", ntokens, s);
274 tokens[ntokens] = NULL;
275 //bb_info_msg("N[%d]", ntokens);
278 type = find_token(tokens, "Content-Type:", "text/plain");
279 //bb_info_msg("T[%s]", type);
280 if (0 == strncasecmp(type, "multipart/", 10)) {
281 if (0 == strcasecmp(type+10, "mixed")) {
282 parse(xfind_token(tokens, "boundary="), argv);
284 bb_error_msg_and_die("no support of content type '%s'", type);
290 const char *charset = find_token(tokens, "charset=", CONFIG_FEATURE_MIME_CHARSET);
292 const char *encoding = find_token(tokens, "Content-Transfer-Encoding:", "7bit");
293 // compose target filename
294 char *filename = (char *)find_token(tokens, "filename=", NULL);
296 filename = xasprintf(uniq, monotonic_us());
298 filename = bb_get_last_path_component_strip(xstrdup(filename));
300 // start external helper, if any
306 // child reads from fd[0]
308 xmove_fd(fd[0], STDIN_FILENO);
309 xsetenv("CONTENT_TYPE", type);
310 xsetenv("CHARSET", charset);
311 xsetenv("ENCODING", encoding);
312 xsetenv("FILENAME", filename);
313 BB_EXECVP_or_die(argv);
315 // parent dumps to fd[1]
317 fp = xfdopen_for_write(fd[1]);
318 signal(SIGPIPE, SIG_IGN); // ignore EPIPE
319 // or create a file for dump
321 char *fname = xasprintf("%s%s", *argv, filename);
322 fp = xfopen_for_write(fname);
330 if (0 == strcasecmp(encoding, "base64")) {
331 read_base64(stdin, fp, '-');
332 } else if (0 != strcasecmp(encoding, "7bit")
333 && 0 != strcasecmp(encoding, "8bit")
335 // quoted-printable, binary, user-defined are unsupported so far
336 bb_error_msg_and_die("no support of encoding '%s'", encoding);
338 // N.B. we have written redundant \n. so truncate the file
339 // The following weird 2-tacts reading technique is due to
340 // we have to not write extra \n at the end of the file
341 // In case of -x option we could truncate the resulting file as
342 // fseek(fp, -1, SEEK_END);
343 // if (ftruncate(fileno(fp), ftell(fp)))
344 // bb_perror_msg("ftruncate");
345 // But in case of -X we have to be much more careful. There is
346 // no means to truncate what we already have sent to the helper.
347 p = xmalloc_fgets_str(stdin, "\r\n");
349 s = xmalloc_fgets_str(stdin, "\r\n");
354 && 0 == strncmp(s+2, boundary, boundary_len)
363 while ((s = xmalloc_fgetline_str(stdin, "\r\n")) != NULL) {
364 if ('-' == s[0] && '-' == s[1]
365 && 0 == strncmp(s+2, boundary, boundary_len))
367 fprintf(fp, "%s\n", s);
369 // N.B. we have written redundant \n. so truncate the file
370 fseek(fp, -1, SEEK_END);
371 if (ftruncate(fileno(fp), ftell(fp)))
372 bb_perror_msg("ftruncate");
379 signal(SIGPIPE, SIG_DFL);
380 // exit if helper exited >0
381 rc = (wait4pid(pid) & 0xff);
386 // check multipart finalized
387 if (s && '-' == s[2+boundary_len] && '-' == s[2+boundary_len+1]) {
396 //bb_info_msg("ENDPARSE[%s]", boundary);
402 Usage: reformime [options]
403 -d - parse a delivery status notification.
404 -e - extract contents of MIME section.
405 -x - extract MIME section to a file.
406 -X - pipe MIME section to a program.
408 -s n.n.n.n - specify MIME section.
409 -r - rewrite message, filling in missing MIME headers.
410 -r7 - also convert 8bit/raw encoding to quoted-printable, if possible.
411 -r8 - also convert quoted-printable encoding to 8bit, if possible.
412 -c charset - default charset for rewriting, -o, and -O.
413 -m [file] [file]... - create a MIME message digest.
414 -h "header" - decode RFC 2047-encoded header.
415 -o "header" - encode unstructured header using RFC 2047.
416 -O "header" - encode address list header using RFC 2047.
419 int reformime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
420 int reformime_main(int argc UNUSED_PARAM, char **argv)
422 const char *opt_prefix = "";
427 // N.B. only -x and -X are supported so far
428 opt_complementary = "x--X:X--x" IF_FEATURE_REFORMIME_COMPAT(":m::");
429 opts = getopt32(argv,
430 "x:X" IF_FEATURE_REFORMIME_COMPAT("deis:r:c:m:h:o:O:"),
432 IF_FEATURE_REFORMIME_COMPAT(, NULL, NULL, &G.opt_charset, NULL, NULL, NULL, NULL)
437 return parse("", (opts & OPT_X) ? argv : (char **)&opt_prefix);