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NetBSD/usr.bin/mail/mime_decode.c

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/* $NetBSD: mime_decode.c,v 1.5 2006/11/28 18:46:04 christos Exp $ */
/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Anon Ymous.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef MIME_SUPPORT
#include <sys/cdefs.h>
#ifndef __lint__
__RCSID("$NetBSD: mime_decode.c,v 1.5 2006/11/28 18:46:04 christos Exp $");
#endif /* not __lint__ */
#include <assert.h>
#include <err.h>
#include <fcntl.h>
#include <libgen.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <iconv.h>
#include "def.h"
#include "extern.h"
#ifdef USE_EDITLINE
#include "complete.h"
#endif
#ifdef MIME_SUPPORT
#include "mime.h"
#include "mime_child.h"
#include "mime_codecs.h"
#include "mime_header.h"
#include "mime_detach.h"
#endif
#include "glob.h"
#include "thread.h"
#if 0
#ifndef __lint__
/*
* XXX - This block for debugging only and eventually should go away.
*/
static void
show_one_mime_info(FILE *fp, struct mime_info *mip)
{
#define XX(a) (a) ? (a) : "<null>"
(void)fprintf(fp, ">> --------\n");
(void)fprintf(fp, "mip %d:\n", mip->mi_partnum);
(void)fprintf(fp, "** Version: %s\n", XX(mip->mi_version));
(void)fprintf(fp, "** type: %s\n", XX(mip->mi_type));
(void)fprintf(fp, "** subtype: %s\n", XX(mip->mi_subtype));
(void)fprintf(fp, "** boundary: %s\n", XX(mip->mi_boundary));
(void)fprintf(fp, "** charset: %s\n", XX(mip->mi_charset));
(void)fprintf(fp, "** encoding: %s\n", XX(mip->mi_encoding));
(void)fprintf(fp, "** disposition: %s\n", XX(mip->mi_disposition));
(void)fprintf(fp, "** filename: %s\n", XX(mip->mi_filename));
(void)fprintf(fp, "** %p: flag: 0x%x, block: %ld, offset: %d, size: %lld, lines: %ld:%ld\n",
mip->mp,
mip->mp->m_flag,
mip->mp->m_block, mip->mp->m_offset, mip->mp->m_size,
mip->mp->m_lines, mip->mp->m_blines);
(void)fprintf(fp, "** mip: %p\n", mip);
(void)fprintf(fp, "** mi_flink: %p\n", mip->mi_flink);
(void)fprintf(fp, "** mi_blink: %p\n", mip->mi_blink);
(void)fprintf(fp, "** mip %p, mp %p, parent_mip %p, parent_mp %p\n",
mip, mip->mp, mip->mi_parent.mip, mip->mi_parent.mp);
(void)fprintf(fp, "** mi_fo %p, mi_head_end %p, mi_pipe_end %p\n",
mip->mi_fo, mip->mi_head_end, mip->mi_pipe_end);
(void)fprintf(fp, "** mi_ignore_body: %d\n", mip->mi_ignore_body);
(void)fprintf(fp, "** mi_partnum: %d\n", mip->mi_partnum);
(void)fprintf(fp, "** mi_partstr: %s\n", mip->mi_partstr);
(void)fprintf(fp, "** mi_msgstr: %d\n", mip->mi_msgstr);
(void)fflush(fp);
#undef XX
}
__unused
static void
show_mime_info(FILE *fp, struct mime_info *mip, struct mime_info *end_mip)
{
for (/* EMTPY */; mip != end_mip; mip = mip->mi_flink)
show_one_mime_info(fp, mip);
(void)fprintf(fp, "++ =========\n");
(void)fflush(fp);
}
#endif /* __lint__ */
#endif /* #if */
/*
* Our interface to the file registry in popen.c
*/
PUBLIC FILE *
pipe_end(struct mime_info *mip)
{
FILE *fp;
fp = last_registered_file(mip->mi_detachdir ? 0 : 1); /* get last registered pipe */
if (fp == NULL)
fp = mip->mi_fo;
return fp;
}
/*
* Copy the first ';' delimited substring from 'src' (null terminated)
* into 'dst', expanding quotes and removing comments (as per RFC
* 822). Returns a pointer in src to the next non-white character
* following ';'. The caller is responsible for ensuring 'dst' is
* sufficiently large to hold the result.
*/
static char *
get_param(char *dst, char *src)
{
char *lastq;
char *cp;
char *cp2;
int nesting;
cp2 = dst;
lastq = dst;
for (cp = src; *cp && *cp != ';'; cp++) {
switch (*cp) {
case '"': /* start of quoted string */
for (cp++; *cp; cp++) {
if (*cp == '"')
break;
if (*cp == '\\' && cp[1] != '\0')
++cp;
*cp2++ = *cp;
}
lastq = cp2-1;
break;
case '(': /* start of comment */
nesting = 1;
while (nesting > 0 && *++cp) {
if (*cp == '\\' && cp[1] != '\0')
cp++;
if (*cp == '(')
nesting++;
if (*cp == ')')
nesting--;
}
break;
default:
*cp2++ = *cp;
break;
}
}
/* remove trailing white space */
while (cp2 > lastq && isblank((unsigned char)cp2[-1]))
cp2--;
*cp2 = '\0';
if (*cp == ';')
cp++;
cp = skip_blank(cp);
return cp;
}
/*
* Content parameter
* if field is NULL, return the content "specifier".
*/
static char*
cparam(const char field[], char *src, int downcase)
{
char *cp;
char *dst;
if (src == NULL)
return NULL;
dst = salloc(strlen(src) + 1); /* large enough for any param in src */
cp = skip_blank(src);
cp = get_param(dst, cp);
if (field == NULL)
return dst;
while (*cp != '\0') {
size_t len = strlen(field);
cp = get_param(dst, cp);
if (strncasecmp(dst, field, len) == 0 && dst[len] == '=') {
char *cp2;
cp2 = dst + len + 1;
if (downcase)
istrcpy(cp2, cp2);
return cp2;
}
}
return NULL;
}
static void
get_content(struct mime_info *mip)
{
char *mime_disposition_field;
char *mime_type_field;
char *filename;
struct message *mp;
char *cp;
mp = mip->mp;
mip->mi_version = cparam(NULL, hfield(MIME_HDR_VERSION, mp), 0);
mip->mi_encoding = cparam(NULL, hfield(MIME_HDR_ENCODING, mp), 1);
mime_type_field = hfield(MIME_HDR_TYPE, mp);
mip->mi_type = cparam(NULL, mime_type_field, 1);
if (mip->mi_type) {
cp = strchr(mip->mi_type, '/');
if (cp)
*cp++ = '\0';
mip->mi_subtype = cp;
}
mip->mi_boundary = cparam("boundary", mime_type_field, 0);
mip->mi_charset = cparam("charset", mime_type_field, 1);
mime_disposition_field = hfield(MIME_HDR_DISPOSITION, mp);
mip->mi_disposition = cparam(NULL, mime_disposition_field, 1);
/*
* The type field typically has a "name" parameter for "image"
* and "video" types, and I assume for other types as well.
* We grab it, but override it if the disposition field has a
* filename parameter as it often does for "attachments".
* More careful analysis could be done, but this seems to work
* pretty well.
*/
filename = cparam("name", mime_type_field, 0);
if ((cp = cparam("filename", mime_disposition_field, 0)) != NULL)
filename = cp;
if (filename) {
filename = basename(filename); /* avoid absolute pathnames */
filename = savestr(filename); /* save it! */
}
mip->mi_filename = filename;
}
static struct message *
salloc_message(int flag, long block, short offset)
{
struct message *mp;
/* use csalloc in case someone adds a field someday! */
mp = csalloc(1, sizeof(*mp));
mp->m_flag = flag;
mp->m_block = block;
mp->m_offset = offset;
#if 0
mp->m_lines = 0;
mp->m_size = 0;
mp->m_blines = 0;
#endif
return mp;
}
static struct mime_info *
insert_new_mip(struct mime_info *this_mip, struct mime_info *top_mip,
struct message *top_mp, off_t end_pos, int partnum)
{
struct mime_info *new_mip;
new_mip = csalloc(1, sizeof(*new_mip));
new_mip->mi_blink = this_mip;
new_mip->mi_flink = this_mip->mi_flink;
this_mip->mi_flink = new_mip;
new_mip->mp = salloc_message(this_mip->mp->m_flag,
(long)blockof(end_pos), offsetof(end_pos));
new_mip->mi_parent.mip = top_mip;
new_mip->mi_parent.mp = top_mp;
new_mip->mi_partnum = partnum;
return new_mip;
}
static void
split_multipart(struct mime_info *top_mip)
{
FILE *fp;
struct message *top_mp;
struct message *this_mp;
struct mime_info *this_mip;
off_t beg_pos;
const char *boundary;
size_t boundary_len;
long lines_left; /* must be signed and same size as m_lines */
int partnum;
int in_header;
top_mp = top_mip->mp;
this_mp = salloc_message(top_mp->m_flag, top_mp->m_block, top_mp->m_offset);
this_mip = top_mip;
this_mip->mp = this_mp;
partnum = 1;
/* top_mip->mi_partnum = partnum++; */ /* Keep the number set by the caller */
in_header = 1;
boundary = top_mip->mi_boundary;
boundary_len = boundary ? strlen(boundary) : 0;
fp = setinput(top_mp);
beg_pos = ftello(fp);
#if 0
warnx("beg_pos: %lld, m_lines: %ld, m_blines: %ld",
beg_pos, top_mp->m_lines, top_mp->m_blines);
#endif
for (lines_left = top_mp->m_lines - 1; lines_left >= 0; lines_left--) {
char *line;
size_t line_len;
line = fgetln(fp, &line_len);
this_mp->m_lines++; /* count the message lines */
if (!in_header)
this_mp->m_blines++; /* count the body lines */
if (lines_left == 0 || (
!in_header &&
line_len >= boundary_len + 2 &&
line[0] == '-' && line[1] == '-' &&
strncmp(line + 2, boundary, boundary_len) == 0)) {
off_t cur_pos;
off_t end_pos;
cur_pos = ftello(fp);
/* the boundary belongs to the next part */
end_pos = cur_pos - line_len;
this_mp->m_lines -= 1;
this_mp->m_blines -= 1;
this_mp->m_size = end_pos - beg_pos;
#if 0
warnx("end_pos: %lld, m_lines: %ld, m_blines: %ld",
end_pos, this_mp->m_lines, this_mp->m_blines);
#endif
if (line[boundary_len + 2] == '-' &&
line[boundary_len + 3] == '-') {/* end of multipart */
/* do a sanity check on the EOM */
if (lines_left != 1) {
/*
* XXX - this can happen!
* Should we display the
* trailing garbage or check
* that it is blank or just
* ignore it?
*/
#if 0
(void)printf("EOM: lines left: %ld\n", lines_left);
#endif
}
break; /* XXX - stop at this point or grab the rest? */
}
this_mip = insert_new_mip(this_mip, top_mip, top_mp, end_pos, partnum++);
this_mp = this_mip->mp;
this_mp->m_lines = 1; /* already read the first line in the header! */
beg_pos = end_pos;
in_header = 1;
}
if (line_len == 1)
in_header = 0;
}
}
static void
split_message(struct mime_info *top_mip)
{
struct mime_info *this_mip;
struct message *top_mp;
struct message *this_mp;
FILE *fp;
off_t beg_pos;
long lines_left; /* must be same size as m_lines */
int in_header;
top_mp = top_mip->mp;
this_mp = salloc_message(top_mp->m_flag, top_mp->m_block, top_mp->m_offset);
this_mip = top_mip;
this_mip->mp = this_mp;
in_header = 1;
fp = setinput(top_mp);
beg_pos = ftello(fp);
for (lines_left = top_mp->m_lines; lines_left > 0; lines_left--) {
size_t line_len;
(void)fgetln(fp, &line_len);
this_mp->m_lines++; /* count the message lines */
if (!in_header)
this_mp->m_blines++; /* count the body lines */
if (in_header && line_len == 1) { /* end of header */
off_t end_pos;
end_pos = ftello(fp);
this_mp->m_size = end_pos - beg_pos;
this_mip = insert_new_mip(this_mip, top_mip,top_mp, end_pos, 0);
this_mp = this_mip->mp;
this_mp->m_lines = 1; /* we already counted one line in the header! */
beg_pos = end_pos;
in_header = 0; /* never in header again */
}
}
/* close the last message */
this_mp->m_size = ftello(fp) - beg_pos;
}
static const char *
get_command_hook(struct mime_info *mip, const char *domain)
{
char *key;
char *cmd;
if (mip->mi_type == NULL)
return NULL;
/* XXX - should we use easprintf() here? We are probably
* hosed elsewhere if this fails anyway. */
cmd = NULL;
if (mip->mi_subtype) {
if (asprintf(&key, "mime%s-%s-%s",
domain, mip->mi_type, mip->mi_subtype) == -1) {
warn("get_command_hook: subtupe: asprintf");
return NULL;
}
cmd = value(key);
free(key);
}
if (cmd == NULL) {
if (asprintf(&key, "mime%s-%s", domain, mip->mi_type) == -1) {
warn("get_command_hook: type: asprintf");
return NULL;
}
cmd = value(key);
free(key);
}
return cmd;
}
static int
is_basic_alternative(struct mime_info *mip)
{
return
strcasecmp(mip->mi_type, "text") == 0 &&
strcasecmp(mip->mi_subtype, "plain") == 0;
}
static struct mime_info *
select_alternative(struct mime_info *top_mip, struct mime_info *end_mip)
{
struct mime_info *the_mip; /* the chosen alternate */
struct mime_info *this_mip;
/*
* The alternates are supposed to occur in order of
* increasing "complexity". So: if there is at least
* one alternate of type "text/plain", use the last
* one, otherwise default to the first alternate.
*/
the_mip = top_mip->mi_flink;
for (this_mip = top_mip->mi_flink;
this_mip != end_mip;
this_mip = this_mip->mi_flink) {
const char *cmd;
if (this_mip->mi_type == NULL ||
this_mip->mi_subtype == NULL)
continue;
if (is_basic_alternative(this_mip))
the_mip = this_mip;
else if (
(cmd = get_command_hook(this_mip, "-hook")) ||
(cmd = get_command_hook(this_mip, "-head")) ||
(cmd = get_command_hook(this_mip, "-body"))) {
int flags;
/* just get the flags. */
flags = mime_run_command(cmd, NULL);
if ((flags & CMD_FLAG_ALTERNATIVE) != 0)
the_mip = this_mip;
}
}
return the_mip;
}
static inline int
is_multipart(struct mime_info *mip)
{
return mip->mi_type &&
strcasecmp("multipart", mip->mi_type) == 0;
}
static inline int
is_message(struct mime_info *mip)
{
return mip->mi_type &&
strcasecmp("message", mip->mi_type) == 0;
}
static inline int
is_alternative(struct mime_info *mip)
{
return mip->mi_subtype &&
strcasecmp("alternative", mip->mi_subtype) == 0;
}
/*
* Take a mime_info pointer and expand it recursively into all its
* mime parts. Only "multipart" and "message" types recursed into;
* they are handled separately.
*/
static struct mime_info *
expand_mip(struct mime_info *top_mip)
{
struct mime_info *this_mip;
struct mime_info *next_mip;
if (top_mip->mi_partnum == 0) {
if (top_mip->mi_blink)
top_mip->mi_partstr = top_mip->mi_blink->mi_partstr;
}
else if (top_mip->mi_parent.mip) {
const char *prefix;
char *cp;
prefix = top_mip->mi_parent.mip->mi_partstr;
(void)sasprintf(&cp, "%s%s%d", prefix,
*prefix ? "." : "", top_mip->mi_partnum);
top_mip->mi_partstr = cp;
}
next_mip = top_mip->mi_flink;
if (is_multipart(top_mip)) {
top_mip->mi_ignore_body = 1; /* the first body is ignored */
split_multipart(top_mip);
for (this_mip = top_mip->mi_flink;
this_mip != next_mip;
this_mip = this_mip->mi_flink) {
get_content(this_mip);
}
if (is_alternative(top_mip)) {
this_mip = select_alternative(top_mip, next_mip);
this_mip->mi_partnum = 0; /* suppress partnum display */
this_mip->mi_flink = next_mip;
this_mip->mi_blink = top_mip;
top_mip->mi_flink = this_mip;
}
/*
* Recurse into each part.
*/
for (this_mip = top_mip->mi_flink;
this_mip != next_mip;
this_mip = expand_mip(this_mip))
continue;
}
else if (is_message(top_mip)) {
top_mip->mi_ignore_body = 1; /* the first body is ignored */
split_message(top_mip);
this_mip = top_mip->mi_flink;
if (this_mip) {
get_content(this_mip);
/*
* If the one part is MIME encoded, recurse into it.
* XXX - Should this be conditional on subtype "rcs822"?
*/
if (this_mip->mi_type &&
this_mip->mi_version &&
equal(this_mip->mi_version, MIME_VERSION)) {
this_mip->mi_partnum = 0;
(void)expand_mip(this_mip);
}
}
}
return next_mip;
}
#if 0
static int
show_partnum(FILE *fp, struct mime_info *mip)
{
int need_dot;
need_dot = 0;
if (mip->mi_parent.mip && mip->mi_parent.mip->mi_parent.mip)
need_dot = show_partnum(fp, mip->mi_parent.mip);
if (mip->mi_partnum) {
(void)fprintf(fp, "%s%d", need_dot ? "." : "", mip->mi_partnum);
need_dot = 1;
}
return need_dot;
}
#endif
PUBLIC struct mime_info *
mime_decode_open(struct message *mp)
{
struct mime_info *mip;
struct mime_info *p;
mip = csalloc(1, sizeof(*mip));
mip->mp = salloc(sizeof(*mip->mp));
*mip->mp = *mp; /* copy this so we don't trash the master mp */
get_content(mip);
/* RFC 2049 - sec 2 item 1 */
if (mip->mi_version == NULL ||
!equal(mip->mi_version, MIME_VERSION))
return NULL;
mip->mi_partstr = "";
if (mip->mi_type)
(void)expand_mip(mip);
/*
* Get the pipe_end and propagate it down the chain.
*/
mip->mi_pipe_end = last_registered_file(0); /* for mime_decode_close() */
for (p = mip->mi_flink; p; p = p->mi_flink)
p->mi_pipe_end = mip->mi_pipe_end;
/* show_mime_info(stderr, mip, NULL); */
return mip;
}
PUBLIC void
mime_decode_close(struct mime_info *mip)
{
if (mip)
close_top_files(mip->mi_pipe_end);
}
struct prefix_line_args_s {
const char *prefix;
size_t prefixlen;
};
static void
prefix_line(FILE *fi, FILE *fo, void *cookie)
{
struct prefix_line_args_s *args;
const char *line;
const char *prefix;
size_t prefixlen;
size_t length;
args = cookie;
prefix = args->prefix;
prefixlen = args->prefixlen;
while ((line = fgetln(fi, &length)) != NULL) {
if (length > 1)
(void)fputs(prefix, fo);
else
(void)fwrite(prefix, sizeof *prefix,
prefixlen, fo);
(void)fwrite(line, sizeof(*line), length, fo);
}
(void)fflush(fo);
}
PUBLIC int
mime_sendmessage(struct message *mp, FILE *obuf, struct ignoretab *igntab,
const char *prefix, struct mime_info *mip)
{
int error;
int detachall_flag;
const char *detachdir;
FILE *end_of_prefix;
if (mip == NULL)
return obuf ? /* were we trying to detach? */
sendmessage(mp, obuf, igntab, prefix, NULL) : 0;
/*
* The prefix has two meanigs which we handle here:
* 1) If obuf == NULL, then we are detaching to the 'prefix' director.
* 2) If obuf != NULL, then the prefix is prepended to each line.
*/
detachdir = NULL;
detachall_flag = igntab == detachall;
if (obuf == NULL) {
assert(prefix != NULL); /* coding error! */
obuf = stdout;
detachdir = prefix;
prefix = NULL;
igntab = ignoreall; /* always ignore the headers */
}
/*
* Set this early so pipe_end() will work!
*/
mip->mi_fo = obuf;
(void)fflush(obuf); /* Be safe and flush! XXX - necessary? */
/*
* Handle the prefix as a pipe stage so it doesn't get seen by
* any decoding or hooks.
*/
if (prefix != NULL) {
static struct prefix_line_args_s prefix_line_args;
const char *dp, *dp2 = NULL;
for (dp = prefix; *dp; dp++)
if (*dp != ' ' && *dp != '\t')
dp2 = dp;
prefix_line_args.prefixlen = dp2 == 0 ? 0 : dp2 - prefix + 1;
prefix_line_args.prefix = prefix;
mime_run_function(prefix_line, pipe_end(mip), (void*)&prefix_line_args);
}
end_of_prefix = last_registered_file(0);
error = 0;
for (/* EMPTY */; mip; mip = mip->mi_flink) {
mip->mi_fo = obuf;
mip->mi_detachdir = detachdir;
mip->mi_detachall = detachall_flag;
error |= sendmessage(mip->mp, pipe_end(mip), igntab, NULL, mip);
close_top_files(end_of_prefix); /* don't close the prefixer! */
}
return error;
}
#ifdef CHARSET_SUPPORT
/**********************************************
* higher level interface to run mime_ficonv().
*/
static void
run_mime_ficonv(struct mime_info *mip, const char *charset)
{
FILE *fo;
iconv_t cd;
fo = pipe_end(mip);
if (charset == NULL ||
mip->mi_charset == NULL ||
strcasecmp(mip->mi_charset, charset) == 0 ||
strcasecmp(mip->mi_charset, "unknown") == 0)
return;
cd = iconv_open(charset, mip->mi_charset);
if (cd == (iconv_t)-1) {
(void)fprintf(fo, "\t [ iconv_open failed: %s ]\n\n",
strerror(errno));
(void)fflush(fo); /* flush here or see double! */
return;
}
if (mip->mi_detachdir == NULL && /* don't contaminate the detach! */
value(ENAME_MIME_CHARSET_VERBOSE))
(void)fprintf(fo, "\t[ converting %s -> %s ]\n\n",
mip->mi_charset, charset);
mime_run_function(mime_ficonv, fo, cd);
(void)iconv_close(cd);
}
#endif /* CHARSET_SUPPORT */
PUBLIC void
run_decoder(struct mime_info *mip, void(*fn)(FILE*, FILE*, void *))
{
#ifdef CHARSET_SUPPORT
char *charset;
charset = value(ENAME_MIME_CHARSET);
if (charset && mip->mi_type && strcasecmp(mip->mi_type, "text") == 0)
run_mime_ficonv(mip, charset);
#endif /* CHARSET_SUPPORT */
if (mip->mi_detachdir == NULL &&
fn == mime_fio_copy)/* XXX - avoid an extra unnecessary pipe stage */
return;
mime_run_function(fn, pipe_end(mip),
mip->mi_detachdir ? NULL : __UNCONST("add_lf"));
}
/*
* Determine how to handle the display based on the type and subtype
* fields.
*/
enum dispmode_e {
DM_IGNORE = 0x00, /* silently ignore part - must be zero! */
DM_DISPLAY, /* decode and display the part */
DM_UNKNOWN, /* unknown display */
DM_BINARY, /* indicate binary data */
DM_PGPSIGN, /* OpenPGP signed part */
DM_PGPENCR, /* OpenPGP encrypted part */
DM_PGPKEYS /* OpenPGP keys part */
};
#define APPLICATION_OCTET_STREAM DM_BINARY
static enum dispmode_e
get_display_mode(struct mime_info *mip, mime_codec_t dec)
{
struct mime_subtype_s {
const char *st_name;
enum dispmode_e st_dispmode;
};
struct mime_type_s {
const char *mt_type;
const struct mime_subtype_s *mt_subtype;
enum dispmode_e mt_dispmode; /* default if NULL subtype */
};
static const struct mime_subtype_s text_subtype_tbl[] = {
{ "plain", DM_DISPLAY },
{ "html", DM_DISPLAY }, /* rfc2854 */
{ "rfc822-headers", DM_DISPLAY },
{ "css", DM_DISPLAY }, /* rfc2318 */
{ "enriched", DM_DISPLAY }, /* rfc1523/rfc1563/rfc1896 */
{ "graphics", DM_DISPLAY }, /* rfc0553 */
{ "nroff", DM_DISPLAY }, /* rfc4263 */
{ "red", DM_DISPLAY }, /* rfc4102 */
{ NULL, DM_DISPLAY } /* default */
};
static const struct mime_subtype_s image_subtype_tbl[] = {
{ "tiff", DM_BINARY }, /* rfc2302/rfc3302 */
{ "tiff-fx", DM_BINARY }, /* rfc3250/rfc3950 */
{ "t38", DM_BINARY }, /* rfc3362 */
{ NULL, DM_BINARY } /* default */
};
static const struct mime_subtype_s audio_subtype_tbl[] = {
{ "mpeg", DM_BINARY }, /* rfc3003 */
{ "t38", DM_BINARY }, /* rfc4612 */
{ NULL, DM_BINARY } /* default */
};
static const struct mime_subtype_s video_subtype_tbl[] = {
{ NULL, DM_BINARY } /* default */
};
static const struct mime_subtype_s application_subtype_tbl[] = {
{ "octet-stream", APPLICATION_OCTET_STREAM },
{ "pgp-encrypted", DM_PGPENCR }, /* rfc3156 */
{ "pgp-keys", DM_PGPKEYS }, /* rfc3156 */
{ "pgp-signature", DM_PGPSIGN }, /* rfc3156 */
{ "pdf", DM_BINARY }, /* rfc3778 */
{ "whoispp-query", DM_UNKNOWN }, /* rfc2957 */
{ "whoispp-response", DM_UNKNOWN }, /* rfc2958 */
{ "font-tdpfr", DM_UNKNOWN }, /* rfc3073 */
{ "xhtml+xml", DM_UNKNOWN }, /* rfc3236 */
{ "ogg", DM_UNKNOWN }, /* rfc3534 */
{ "rdf+xml", DM_UNKNOWN }, /* rfc3870 */
{ "soap+xml", DM_UNKNOWN }, /* rfc3902 */
{ "mbox", DM_UNKNOWN }, /* rfc4155 */
{ "xv+xml", DM_UNKNOWN }, /* rfc4374 */
{ "smil", DM_UNKNOWN }, /* rfc4536 */
{ "smil+xml", DM_UNKNOWN }, /* rfc4536 */
{ "json", DM_UNKNOWN }, /* rfc4627 */
{ "voicexml+xml", DM_UNKNOWN }, /* rfc4267 */
{ "ssml+xml", DM_UNKNOWN }, /* rfc4267 */
{ "srgs", DM_UNKNOWN }, /* rfc4267 */
{ "srgs+xml", DM_UNKNOWN }, /* rfc4267 */
{ "ccxml+xml", DM_UNKNOWN }, /* rfc4267 */
{ "pls+xml.", DM_UNKNOWN }, /* rfc4267 */
{ NULL, APPLICATION_OCTET_STREAM } /* default */
};
static const struct mime_type_s mime_type_tbl[] = {
{ "text", text_subtype_tbl, DM_DISPLAY },
{ "image", image_subtype_tbl, DM_IGNORE },
{ "audio", audio_subtype_tbl, DM_IGNORE },
{ "video", video_subtype_tbl, DM_IGNORE },
{ "application", application_subtype_tbl, APPLICATION_OCTET_STREAM },
{ "NULL", NULL, DM_UNKNOWN }, /* default */
};
const struct mime_type_s *mtp;
const struct mime_subtype_s *stp;
const char *mi_type;
const char *mi_subtype;
/*
* Silently ignore all multipart bodies.
* 1) In the case of "multipart" types, this typically
* contains a message for non-mime enabled mail readers.
* 2) In the case of "message" type, there should be no body.
*/
if (mip->mi_ignore_body) /*is_multipart(mip) || is_message(mip))*/
return DM_IGNORE;
/*
* If the encoding type given but not recognized, treat block
* as "application/octet-stream". rfc 2049 sec 2 part 2.
*/
if (mip->mi_encoding && dec == NULL)
return APPLICATION_OCTET_STREAM;
mi_type = mip->mi_type;
mi_subtype = mip->mi_type ? mip->mi_subtype : NULL;
/*
* If there was no type specified, display anyway so we don't
* miss anything. (The encoding type is known.)
*/
if (mi_type == NULL)
return DM_DISPLAY; /* XXX - default to something safe! */
for (mtp = mime_type_tbl; mtp->mt_type; mtp++) {
if (strcasecmp(mtp->mt_type, mi_type) == 0) {
if (mi_subtype == NULL)
return mtp->mt_dispmode;
for (stp = mtp->mt_subtype; stp->st_name; stp++) {
if (strcasecmp(stp->st_name, mi_subtype) == 0)
return stp->st_dispmode;
}
return stp->st_dispmode;
}
}
return mtp->mt_dispmode;
}
PUBLIC FILE *
mime_decode_body(struct mime_info *mip)
{
static enum dispmode_e dispmode;
mime_codec_t dec;
const char *cmd;
/* close anything left over from mime_decode_head() */
close_top_files(mip->mi_head_end);
/*
* Make sure we flush everything down the pipe so children
* don't see it.
*/
(void)fflush(pipe_end(mip));
if (mip->mi_detachdir) /* We are detaching! Ignore the hooks. */
return mime_detach_parts(mip);
cmd = NULL;
if (mip->mi_command_hook == NULL)
cmd = get_command_hook(mip, "-body");
dec = mime_fio_decoder(mip->mi_encoding);
/*
* If there is a filter running, we need to send the message
* to it. Otherwise, get the default display mode for this body.
*/
dispmode = cmd || mip->mi_command_hook ? DM_DISPLAY : get_display_mode(mip, dec);
if (dec == NULL) /* make sure we have a usable decoder */
dec = mime_fio_decoder(MIME_TRANSFER_7BIT);
if (dispmode == DM_DISPLAY) {
int flags;
if (cmd == NULL)
/* just get the flags */
flags = mime_run_command(mip->mi_command_hook, NULL);
else
flags = mime_run_command(cmd, pipe_end(mip));
if ((flags & CMD_FLAG_NO_DECODE) == 0)
run_decoder(mip, dec);
return pipe_end(mip);
}
else {
static const struct msg_tbl_s {
enum dispmode_e dm;
const char *msg;
} msg_tbl[] = {
{ DM_BINARY, "binary content" },
{ DM_PGPSIGN, "OpenPGP signature" },
{ DM_PGPENCR, "OpenPGP encrypted" },
{ DM_PGPKEYS, "OpenPGP keys" },
{ DM_UNKNOWN, "unknown data" },
{ DM_IGNORE, NULL },
{ -1, NULL },
};
const struct msg_tbl_s *mp;
for (mp = msg_tbl; mp->dm != -1; mp++)
if (mp->dm == dispmode)
break;
assert(mp->dm != -1); /* msg_tbl is short if this happens! */
if (mp->msg)
(void)fprintf(pipe_end(mip), " [%s]\n\n", mp->msg);
return NULL;
}
}
/************************************************************************
* Higher level header decoding interface.
*
* The core routines are in mime_header.c.
*/
PUBLIC char *
mime_decode_hfield(char *linebuf, size_t bufsize, char *hdrstr)
{
hfield_decoder_t decode;
decode = mime_hfield_decoder(hdrstr);
if (decode) {
decode(linebuf, bufsize, hdrstr);
return linebuf;
}
return hdrstr;
}
/*
* Return the next header field found in the given message.
* Return >= 0 if something found, < 0 elsewise.
* "colon" is set to point to the colon in the header.
*/
static int
get_folded_hfield(FILE *f, char *linebuf, size_t bufsize, int rem, char **colon)
{
char *cp, *cp2;
char *line;
size_t len;
for (;;) {
if (--rem <= 0)
return -1;
if ((cp = fgetln(f, &len)) == NULL)
return -1;
for (cp2 = cp; isprint((unsigned char)*cp2) &&
!isblank((unsigned char)*cp2) && *cp2 != ':'; cp2++)
continue;
len = MIN(bufsize - 1, len);
bufsize -= len;
(void)memcpy(linebuf, cp, len);
*colon = *cp2 == ':' ? linebuf + (cp2 - cp) : NULL;
line = linebuf + len;
for (/*EMPTY*/; rem > 0; rem--) {
int c;
(void)ungetc(c = getc(f), f);
if (c == EOF || !isblank((unsigned char)c))
break;
if ((cp = fgetln(f, &len)) == NULL)
break;
len = MIN(bufsize - 1, len);
bufsize -= len;
if (len == 0)
break;
(void)memcpy(line, cp, len);
line += len;
}
*line = 0;
return rem;
/* NOTREACHED */
}
}
static void
decode_header(FILE *fi, FILE *fo, void *cookie __unused)
{
char linebuf[LINESIZE];
char *colon;
#ifdef __lint__
cookie = cookie;
#endif
while(get_folded_hfield(fi, linebuf, sizeof(linebuf), INT_MAX, &colon) >= 0) {
char decbuf[LINESIZE];
char *hdrstr;
hdrstr = linebuf;
if (colon)
hdrstr = mime_decode_hfield(decbuf, sizeof(decbuf), hdrstr);
(void)fprintf(fo, hdrstr);
}
}
PUBLIC FILE *
mime_decode_header(struct mime_info *mip)
{
int flags;
const char *cmd;
FILE *fo;
fo = pipe_end(mip);
if (mip->mi_detachdir) { /* We are detaching. Don't run anything! */
(void)fflush(fo);
return pipe_end(mip);
}
if (mip->mi_partnum)
(void)fprintf(fo, "----- Part %s -----\n", mip->mi_partstr);
(void)fflush(fo); /* Flush so the childern don't see it. */
/*
* install the message hook before the head hook.
*/
cmd = get_command_hook(mip, "-hook");
mip->mi_command_hook = cmd;
if (cmd) {
flags = mime_run_command(cmd, pipe_end(mip));
mip->mi_head_end = last_registered_file(0);
}
else {
cmd = get_command_hook(mip, "-head");
mip->mi_head_end = last_registered_file(0);
flags = mime_run_command(cmd, pipe_end(mip));
}
if (value(ENAME_MIME_DECODE_HDR) && (flags & CMD_FLAG_NO_DECODE) == 0)
mime_run_function(decode_header, pipe_end(mip), NULL);
return pipe_end(mip);
}
#endif /* MIME_SUPPORT */
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