hush/mailutils/mime.c

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/* vi: set sw=4 ts=4: */
/*
* makemime: create MIME-encoded message
* reformime: parse MIME-encoded message
*
* Copyright (C) 2008 by Vladimir Dronnikov <dronnikov@gmail.com>
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "libbb.h"
#include "mail.h"
/*
makemime -c type [-o file] [-e encoding] [-C charset] [-N name] \
[-a "Header: Contents"] file
-m [ type ] [-o file] [-e encoding] [-a "Header: Contents"] file
-j [-o file] file1 file2
@file
file: filename - read or write from filename
- - read or write from stdin or stdout
&n - read or write from file descriptor n
\( opts \) - read from child process, that generates [ opts ]
Options:
-c type - create a new MIME section from "file" with this
Content-Type: (default is application/octet-stream).
-C charset - MIME charset of a new text/plain section.
-N name - MIME content name of the new mime section.
-m [ type ] - create a multipart mime section from "file" of this
Content-Type: (default is multipart/mixed).
-e encoding - use the given encoding (7bit, 8bit, quoted-printable,
or base64), instead of guessing. Omit "-e" and use
-c auto to set Content-Type: to text/plain or
application/octet-stream based on picked encoding.
-j file1 file2 - join mime section file2 to multipart section file1.
-o file - write the result to file, instead of stdout (not
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allowed in child processes).
-a header - prepend an additional header to the output.
@file - read all of the above options from file, one option or
value on each line.
{which version of makemime is this? What do we support?}
*/
/* In busybox 1.15.0.svn, makemime generates output like this
* (empty lines are shown exactly!):
{headers added with -a HDR}
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="24269534-2145583448-1655890676"
--24269534-2145583448-1655890676
Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
Content-Disposition: inline; filename="A"
Content-Transfer-Encoding: base64
...file A contents...
--24269534-2145583448-1655890676
Content-Type: {set by -c, e.g. text/plain}; charset={set by -C, e.g. us-ascii}
Content-Disposition: inline; filename="B"
Content-Transfer-Encoding: base64
...file B contents...
--24269534-2145583448-1655890676--
*/
/* For reference: here is an example email to LKML which has
* 1st unnamed part (so it serves as an email body)
* and one attached file:
...other headers...
Content-Type: multipart/mixed; boundary="=-tOfTf3byOS0vZgxEWcX+"
...other headers...
Mime-Version: 1.0
...other headers...
--=-tOfTf3byOS0vZgxEWcX+
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
...email text...
...email text...
--=-tOfTf3byOS0vZgxEWcX+
Content-Disposition: attachment; filename="xyz"
Content-Type: text/plain; name="xyz"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
...file contents...
...file contents...
--=-tOfTf3byOS0vZgxEWcX+--
...random junk added by mailing list robots and such...
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*/
int makemime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int makemime_main(int argc UNUSED_PARAM, char **argv)
{
llist_t *opt_headers = NULL, *l;
const char *opt_output;
#define boundary opt_output
enum {
OPT_c = 1 << 0, // Content-Type:
OPT_e = 1 << 1, // Content-Transfer-Encoding. Ignored. Assumed base64
OPT_o = 1 << 2, // output to
OPT_C = 1 << 3, // charset
OPT_N = 1 << 4, // COMPAT
OPT_a = 1 << 5, // additional headers
OPT_m = 1 << 6, // COMPAT
OPT_j = 1 << 7, // COMPAT
};
INIT_G();
// parse options
opt_complementary = "a::";
opts = getopt32(argv,
"c:e:o:C:N:a:m:j:",
&G.content_type, NULL, &opt_output, &G.opt_charset, NULL, &opt_headers, NULL, NULL
);
//argc -= optind;
argv += optind;
// respect -o output
if (opts & OPT_o)
freopen(opt_output, "w", stdout);
// no files given on command line? -> use stdin
if (!*argv)
*--argv = (char *)"-";
// put additional headers
for (l = opt_headers; l; l = l->link)
puts(l->data);
// make a random string -- it will delimit message parts
srand(monotonic_us());
boundary = xasprintf("%u-%u-%u",
(unsigned)rand(), (unsigned)rand(), (unsigned)rand());
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// put multipart header
printf(
"Mime-Version: 1.0\n"
"Content-Type: multipart/mixed; boundary=\"%s\"\n"
, boundary
);
// put attachments
while (*argv) {
printf(
"\n--%s\n"
"Content-Type: %s; charset=%s\n"
"Content-Disposition: inline; filename=\"%s\"\n"
"Content-Transfer-Encoding: base64\n"
, boundary
, G.content_type
, G.opt_charset
, bb_get_last_path_component_strip(*argv)
);
encode_base64(*argv++, (const char *)stdin, "");
}
// put multipart footer
printf("\n--%s--\n" "\n", boundary);
return EXIT_SUCCESS;
#undef boundary
}
static const char *find_token(const char *const string_array[], const char *key, const char *defvalue)
{
const char *r = NULL;
int i;
for (i = 0; string_array[i] != NULL; i++) {
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if (strcasecmp(string_array[i], key) == 0) {
r = (char *)string_array[i+1];
break;
}
}
return (r) ? r : defvalue;
}
static const char *xfind_token(const char *const string_array[], const char *key)
{
const char *r = find_token(string_array, key, NULL);
if (r)
return r;
bb_error_msg_and_die("header: %s", key);
}
enum {
OPT_x = 1 << 0,
OPT_X = 1 << 1,
#if ENABLE_FEATURE_REFORMIME_COMPAT
OPT_d = 1 << 2,
OPT_e = 1 << 3,
OPT_i = 1 << 4,
OPT_s = 1 << 5,
OPT_r = 1 << 6,
OPT_c = 1 << 7,
OPT_m = 1 << 8,
OPT_h = 1 << 9,
OPT_o = 1 << 10,
OPT_O = 1 << 11,
#endif
};
static int parse(const char *boundary, char **argv)
{
char *line, *s, *p;
const char *type;
int boundary_len = strlen(boundary);
const char *delims = " ;\"\t\r\n";
const char *uniq;
int ntokens;
const char *tokens[32]; // 32 is enough
// prepare unique string pattern
uniq = xasprintf("%%llu.%u.%s", (unsigned)getpid(), safe_gethostname());
//bb_info_msg("PARSE[%s]", terminator);
while ((line = xmalloc_fgets_str(stdin, "\r\n\r\n")) != NULL) {
// seek to start of MIME section
// N.B. to avoid false positives let us seek to the _last_ occurance
p = NULL;
s = line;
while ((s = strcasestr(s, "Content-Type:")) != NULL)
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p = s++;
if (!p)
goto next;
//bb_info_msg("L[%s]", p);
// split to tokens
// TODO: strip of comments which are of form: (comment-text)
ntokens = 0;
tokens[ntokens] = NULL;
for (s = strtok(p, delims); s; s = strtok(NULL, delims)) {
tokens[ntokens] = s;
if (ntokens < ARRAY_SIZE(tokens) - 1)
ntokens++;
//bb_info_msg("L[%d][%s]", ntokens, s);
}
tokens[ntokens] = NULL;
//bb_info_msg("N[%d]", ntokens);
// analyse tokens
type = find_token(tokens, "Content-Type:", "text/plain");
//bb_info_msg("T[%s]", type);
if (0 == strncasecmp(type, "multipart/", 10)) {
if (0 == strcasecmp(type+10, "mixed")) {
parse(xfind_token(tokens, "boundary="), argv);
} else
bb_error_msg_and_die("no support of content type '%s'", type);
} else {
pid_t pid = pid;
int rc;
FILE *fp;
// fetch charset
const char *charset = find_token(tokens, "charset=", CONFIG_FEATURE_MIME_CHARSET);
// fetch encoding
const char *encoding = find_token(tokens, "Content-Transfer-Encoding:", "7bit");
// compose target filename
char *filename = (char *)find_token(tokens, "filename=", NULL);
if (!filename)
filename = xasprintf(uniq, monotonic_us());
else
filename = bb_get_last_path_component_strip(xstrdup(filename));
// start external helper, if any
if (opts & OPT_X) {
int fd[2];
xpipe(fd);
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pid = vfork();
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if (0 == pid) {
// child reads from fd[0]
close(fd[1]);
xmove_fd(fd[0], STDIN_FILENO);
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xsetenv("CONTENT_TYPE", type);
xsetenv("CHARSET", charset);
xsetenv("ENCODING", encoding);
xsetenv("FILENAME", filename);
BB_EXECVP(*argv, argv);
_exit(EXIT_FAILURE);
}
// parent dumps to fd[1]
close(fd[0]);
fp = xfdopen_for_write(fd[1]);
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signal(SIGPIPE, SIG_IGN); // ignore EPIPE
// or create a file for dump
} else {
char *fname = xasprintf("%s%s", *argv, filename);
fp = xfopen_for_write(fname);
free(fname);
}
// housekeeping
free(filename);
// dump to fp
if (0 == strcasecmp(encoding, "base64")) {
decode_base64(stdin, fp);
} else if (0 != strcasecmp(encoding, "7bit")
&& 0 != strcasecmp(encoding, "8bit")
) {
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// quoted-printable, binary, user-defined are unsupported so far
bb_error_msg_and_die("no support of encoding '%s'", encoding);
} else {
// N.B. we have written redundant \n. so truncate the file
// The following weird 2-tacts reading technique is due to
// we have to not write extra \n at the end of the file
// In case of -x option we could truncate the resulting file as
// fseek(fp, -1, SEEK_END);
// if (ftruncate(fileno(fp), ftell(fp)))
// bb_perror_msg("ftruncate");
// But in case of -X we have to be much more careful. There is
// no means to truncate what we already have sent to the helper.
p = xmalloc_fgets_str(stdin, "\r\n");
while (p) {
s = xmalloc_fgets_str(stdin, "\r\n");
if (s == NULL)
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break;
if ('-' == s[0]
&& '-' == s[1]
&& 0 == strncmp(s+2, boundary, boundary_len)
) {
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break;
}
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fputs(p, fp);
p = s;
}
/*
while ((s = xmalloc_fgetline_str(stdin, "\r\n")) != NULL) {
if ('-' == s[0] && '-' == s[1]
&& 0 == strncmp(s+2, boundary, boundary_len))
break;
fprintf(fp, "%s\n", s);
}
// N.B. we have written redundant \n. so truncate the file
fseek(fp, -1, SEEK_END);
if (ftruncate(fileno(fp), ftell(fp)))
bb_perror_msg("ftruncate");
*/
}
fclose(fp);
// finalize helper
if (opts & OPT_X) {
signal(SIGPIPE, SIG_DFL);
// exit if helper exited >0
rc = wait4pid(pid);
if (rc)
return rc+20;
}
// check multipart finalized
if (s && '-' == s[2+boundary_len] && '-' == s[2+boundary_len+1]) {
free(line);
break;
}
}
next:
free(line);
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}
//bb_info_msg("ENDPARSE[%s]", boundary);
return EXIT_SUCCESS;
}
/*
Usage: reformime [options]
-d - parse a delivery status notification.
-e - extract contents of MIME section.
-x - extract MIME section to a file.
-X - pipe MIME section to a program.
-i - show MIME info.
-s n.n.n.n - specify MIME section.
-r - rewrite message, filling in missing MIME headers.
-r7 - also convert 8bit/raw encoding to quoted-printable, if possible.
-r8 - also convert quoted-printable encoding to 8bit, if possible.
-c charset - default charset for rewriting, -o, and -O.
-m [file] [file]... - create a MIME message digest.
-h "header" - decode RFC 2047-encoded header.
-o "header" - encode unstructured header using RFC 2047.
-O "header" - encode address list header using RFC 2047.
*/
int reformime_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int reformime_main(int argc UNUSED_PARAM, char **argv)
{
const char *opt_prefix = "";
INIT_G();
// parse options
// N.B. only -x and -X are supported so far
opt_complementary = "x--X:X--x" IF_FEATURE_REFORMIME_COMPAT(":m::");
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opts = getopt32(argv,
"x:X" IF_FEATURE_REFORMIME_COMPAT("deis:r:c:m:h:o:O:"),
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&opt_prefix
IF_FEATURE_REFORMIME_COMPAT(, NULL, NULL, &G.opt_charset, NULL, NULL, NULL, NULL)
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);
//argc -= optind;
argv += optind;
return parse("", (opts & OPT_X) ? argv : (char **)&opt_prefix);
}