/
mime_headers.c
1956 lines (1725 loc) · 44.6 KB
/
mime_headers.c
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/*-
* Copyright 2016 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mime_headers.h"
#include "smtp_parsers.h"
#include "mime_encoding.h"
#include "contrib/uthash/utlist.h"
#include "libserver/mempool_vars_internal.h"
#include "libserver/url.h"
#include "libserver/cfg_file.h"
#include "libutil/util.h"
#include <unicode/utf8.h>
KHASH_INIT (rspamd_mime_headers_htb, gchar *,
struct rspamd_mime_header *, 1,
rspamd_strcase_hash, rspamd_strcase_equal);
struct rspamd_mime_headers_table {
khash_t(rspamd_mime_headers_htb) htb;
ref_entry_t ref;
};
#define RSPAMD_INET_ADDRESS_PARSE_RECEIVED \
(RSPAMD_INET_ADDRESS_PARSE_REMOTE|RSPAMD_INET_ADDRESS_PARSE_NO_UNIX)
static void
rspamd_mime_header_check_special (struct rspamd_task *task,
struct rspamd_mime_header *rh)
{
guint64 h;
struct rspamd_received_header *recv;
const gchar *p, *end;
gchar *id;
gint max_recipients = -1;
if (task->cfg) {
max_recipients = task->cfg->max_recipients;
}
h = rspamd_icase_hash (rh->name, strlen (rh->name), 0xdeadbabe);
switch (h) {
case 0x88705DC4D9D61ABULL: /* received */
recv = rspamd_mempool_alloc0 (task->task_pool,
sizeof (struct rspamd_received_header));
recv->hdr = rh;
if (rspamd_smtp_received_parse (task, rh->decoded,
strlen (rh->decoded), recv) != -1) {
DL_APPEND (MESSAGE_FIELD (task, received), recv);
}
rh->flags |= RSPAMD_HEADER_RECEIVED;
break;
case 0x76F31A09F4352521ULL: /* to */
MESSAGE_FIELD (task, rcpt_mime) = rspamd_email_address_from_mime (task->task_pool,
rh->value, strlen (rh->value),
MESSAGE_FIELD (task, rcpt_mime), max_recipients);
rh->flags |= RSPAMD_HEADER_TO|RSPAMD_HEADER_RCPT|RSPAMD_HEADER_UNIQUE;
break;
case 0x7EB117C1480B76ULL: /* cc */
MESSAGE_FIELD (task, rcpt_mime) = rspamd_email_address_from_mime (task->task_pool,
rh->value, strlen (rh->value),
MESSAGE_FIELD (task, rcpt_mime), max_recipients);
rh->flags |= RSPAMD_HEADER_CC|RSPAMD_HEADER_RCPT|RSPAMD_HEADER_UNIQUE;
break;
case 0xE4923E11C4989C8DULL: /* bcc */
MESSAGE_FIELD (task, rcpt_mime) = rspamd_email_address_from_mime (task->task_pool,
rh->value, strlen (rh->value),
MESSAGE_FIELD (task, rcpt_mime), max_recipients);
rh->flags |= RSPAMD_HEADER_BCC|RSPAMD_HEADER_RCPT|RSPAMD_HEADER_UNIQUE;
break;
case 0x41E1985EDC1CBDE4ULL: /* from */
MESSAGE_FIELD (task, from_mime) = rspamd_email_address_from_mime (task->task_pool,
rh->value, strlen (rh->value),
MESSAGE_FIELD (task, from_mime), max_recipients);
rh->flags |= RSPAMD_HEADER_FROM|RSPAMD_HEADER_SENDER|RSPAMD_HEADER_UNIQUE;
break;
case 0x43A558FC7C240226ULL: /* message-id */ {
rh->flags = RSPAMD_HEADER_MESSAGE_ID|RSPAMD_HEADER_UNIQUE;
p = rh->decoded;
end = p + strlen (p);
if (*p == '<') {
p++;
}
if (end > p) {
gchar *d;
if (*(end - 1) == '>') {
end --;
}
id = rspamd_mempool_alloc (task->task_pool, end - p + 1);
d = id;
while (p < end) {
if (g_ascii_isgraph (*p)) {
*d++ = *p++;
}
else {
*d++ = '?';
p++;
}
}
*d = '\0';
MESSAGE_FIELD (task, message_id) = id;
}
break;
}
case 0xB91D3910358E8212ULL: /* subject */
if (MESSAGE_FIELD (task, subject) == NULL) {
MESSAGE_FIELD (task, subject) = rh->decoded;
}
rh->flags = RSPAMD_HEADER_SUBJECT|RSPAMD_HEADER_UNIQUE;
break;
case 0xEE4AA2EAAC61D6F4ULL: /* return-path */
if (task->from_envelope == NULL) {
task->from_envelope = rspamd_email_address_from_smtp (rh->decoded,
strlen (rh->decoded));
}
rh->flags = RSPAMD_HEADER_RETURN_PATH|RSPAMD_HEADER_UNIQUE;
break;
case 0xB9EEFAD2E93C2161ULL: /* delivered-to */
if (task->deliver_to == NULL) {
task->deliver_to = rh->decoded;
}
rh->flags = RSPAMD_HEADER_DELIVERED_TO;
break;
case 0x2EC3BFF3C393FC10ULL: /* date */
case 0xAC0DDB1A1D214CAULL: /* sender */
case 0x54094572367AB695ULL: /* in-reply-to */
case 0x81CD9E9131AB6A9AULL: /* content-type */
case 0xC39BD9A75AA25B60ULL: /* content-transfer-encoding */
case 0xB3F6704CB3AD6589ULL: /* references */
rh->flags = RSPAMD_HEADER_UNIQUE;
break;
}
}
static void
rspamd_mime_header_add (struct rspamd_task *task,
khash_t(rspamd_mime_headers_htb) *target,
struct rspamd_mime_header **order_ptr,
struct rspamd_mime_header *rh,
gboolean check_special)
{
khiter_t k;
struct rspamd_mime_header *ex;
int res;
k = kh_put (rspamd_mime_headers_htb, target, rh->name, &res);
if (res == 0) {
ex = kh_value (target, k);
DL_APPEND (ex, rh);
msg_debug_task ("append raw header %s: %s", rh->name, rh->value);
}
else {
kh_value (target, k) = rh;
rh->prev = rh;
rh->next = NULL;
msg_debug_task ("add new raw header %s: %s", rh->name, rh->value);
}
LL_PREPEND2 (*order_ptr, rh, ord_next);
if (check_special) {
rspamd_mime_header_check_special (task, rh);
}
}
/* Convert raw headers to a list of struct raw_header * */
void
rspamd_mime_headers_process (struct rspamd_task *task,
struct rspamd_mime_headers_table *target,
struct rspamd_mime_header **order_ptr,
const gchar *in, gsize len,
gboolean check_newlines)
{
struct rspamd_mime_header *nh = NULL;
const gchar *p, *c, *end;
gchar *tmp, *tp;
gint state = 0, l, next_state = 100, err_state = 100, t_state;
gboolean valid_folding = FALSE;
guint nlines_count[RSPAMD_TASK_NEWLINES_MAX];
guint norder = 0;
p = in;
end = p + len;
c = p;
memset (nlines_count, 0, sizeof (nlines_count));
msg_debug_task ("start processing headers");
while (p < end) {
/* FSM for processing headers */
switch (state) {
case 0:
/* Begin processing headers */
if (!g_ascii_isalpha (*p)) {
/* We have some garbage at the beginning of headers, skip this line */
state = 100;
next_state = 0;
}
else {
state = 1;
c = p;
}
break;
case 1:
/* We got something like header's name */
if (*p == ':') {
nh = rspamd_mempool_alloc0 (task->task_pool,
sizeof (struct rspamd_mime_header));
l = p - c;
tmp = rspamd_mempool_alloc (task->task_pool, l + 1);
rspamd_null_safe_copy (c, l, tmp, l + 1);
nh->name = tmp;
nh->flags |= RSPAMD_HEADER_EMPTY_SEPARATOR;
nh->raw_value = c;
nh->raw_len = p - c; /* Including trailing ':' */
p++;
state = 2;
c = p;
}
else if (g_ascii_isspace (*p)) {
/* Not header but some garbage */
task->flags |= RSPAMD_TASK_FLAG_BROKEN_HEADERS;
state = 100;
next_state = 0;
}
else {
p++;
}
break;
case 2:
/* We got header's name, so skip any \t or spaces */
if (*p == '\t') {
nh->flags &= ~RSPAMD_HEADER_EMPTY_SEPARATOR;
nh->flags |= RSPAMD_HEADER_TAB_SEPARATED;
p++;
}
else if (*p == ' ') {
nh->flags &= ~RSPAMD_HEADER_EMPTY_SEPARATOR;
p++;
}
else if (*p == '\n' || *p == '\r') {
if (check_newlines) {
if (*p == '\n') {
nlines_count[RSPAMD_TASK_NEWLINES_LF] ++;
}
else if (p + 1 < end && *(p + 1) == '\n') {
nlines_count[RSPAMD_TASK_NEWLINES_CRLF] ++;
}
else {
nlines_count[RSPAMD_TASK_NEWLINES_CR] ++;
}
}
/* Process folding */
state = 99;
l = p - c;
if (l > 0) {
tmp = rspamd_mempool_alloc (task->task_pool, l + 1);
rspamd_null_safe_copy (c, l, tmp, l + 1);
nh->separator = tmp;
}
next_state = 3;
err_state = 5;
c = p;
}
else {
/* Process value */
l = p - c;
if (l >= 0) {
tmp = rspamd_mempool_alloc (task->task_pool, l + 1);
rspamd_null_safe_copy (c, l, tmp, l + 1);
nh->separator = tmp;
}
c = p;
state = 3;
}
break;
case 3:
if (*p == '\r' || *p == '\n') {
/* Hold folding */
if (check_newlines) {
if (*p == '\n') {
nlines_count[RSPAMD_TASK_NEWLINES_LF] ++;
}
else if (p + 1 < end && *(p + 1) == '\n') {
nlines_count[RSPAMD_TASK_NEWLINES_CRLF] ++;
}
else {
nlines_count[RSPAMD_TASK_NEWLINES_CR] ++;
}
}
state = 99;
next_state = 3;
err_state = 4;
}
else if (p + 1 == end) {
state = 4;
}
else {
p++;
}
break;
case 4:
/* Copy header's value */
/*
* XXX:
* The original decision to use here null terminated
* strings was extremely poor!
*/
l = p - c;
tmp = rspamd_mempool_alloc (task->task_pool, l + 1);
tp = tmp;
t_state = 0;
while (l--) {
if (t_state == 0) {
/* Before folding */
if (*c == '\n' || *c == '\r') {
t_state = 1;
c++;
*tp++ = ' ';
}
else {
if (*c != '\0') {
*tp++ = *c++;
}
else {
c++;
}
}
}
else if (t_state == 1) {
/* Inside folding */
if (g_ascii_isspace (*c)) {
c++;
}
else {
t_state = 0;
if (*c != '\0') {
*tp++ = *c++;
}
else {
c++;
}
}
}
}
/* Strip last space that can be added by \r\n parsing */
if (tp > tmp && *(tp - 1) == ' ') {
tp--;
}
*tp = '\0';
/* Strip the initial spaces that could also be added by folding */
while (*tmp != '\0' && g_ascii_isspace (*tmp)) {
tmp ++;
}
if (p + 1 == end) {
nh->raw_len = end - nh->raw_value;
}
else {
nh->raw_len = p - nh->raw_value;
}
nh->value = tmp;
gboolean broken_utf = FALSE;
nh->decoded = rspamd_mime_header_decode (task->task_pool,
nh->value, strlen (tmp), &broken_utf);
if (broken_utf) {
task->flags |= RSPAMD_TASK_FLAG_BAD_UNICODE;
}
if (nh->decoded == NULL) {
nh->decoded = "";
}
/* We also validate utf8 and replace all non-valid utf8 chars */
rspamd_mime_charset_utf_enforce (nh->decoded, strlen (nh->decoded));
nh->order = norder ++;
rspamd_mime_header_add (task, &target->htb, order_ptr, nh, check_newlines);
nh = NULL;
state = 0;
break;
case 5:
/* Header has only name, no value */
nh->value = "";
nh->decoded = "";
nh->raw_len = p - nh->raw_value;
nh->order = norder ++;
rspamd_mime_header_add (task, &target->htb, order_ptr, nh, check_newlines);
nh = NULL;
state = 0;
break;
case 99:
/* Folding state */
if (p + 1 == end) {
state = err_state;
}
else {
if (*p == '\r' || *p == '\n') {
p++;
valid_folding = FALSE;
}
else if (*p == '\t' || *p == ' ') {
/* Valid folding */
p++;
valid_folding = TRUE;
}
else {
if (valid_folding) {
debug_task ("go to state: %d->%d", state, next_state);
state = next_state;
}
else {
/* Fall back */
debug_task ("go to state: %d->%d", state, err_state);
state = err_state;
}
}
}
break;
case 100:
/* Fail state, skip line */
if (*p == '\r') {
if (p + 1 < end && *(p + 1) == '\n') {
nlines_count[RSPAMD_TASK_NEWLINES_CRLF] ++;
p++;
}
p++;
state = next_state;
}
else if (*p == '\n') {
nlines_count[RSPAMD_TASK_NEWLINES_LF] ++;
if (p + 1 < end && *(p + 1) == '\r') {
p++;
}
p++;
state = next_state;
}
else if (p + 1 == end) {
state = next_state;
p++;
}
else {
p++;
}
break;
}
}
/* Since we have prepended headers, we need to reverse the list to get the actual order */
LL_REVERSE (*order_ptr);
if (check_newlines) {
guint max_cnt = 0;
gint sel = 0;
rspamd_cryptobox_hash_state_t hs;
guchar hout[rspamd_cryptobox_HASHBYTES], *hexout;
for (gint i = RSPAMD_TASK_NEWLINES_CR; i < RSPAMD_TASK_NEWLINES_MAX; i ++) {
if (nlines_count[i] > max_cnt) {
max_cnt = nlines_count[i];
sel = i;
}
}
MESSAGE_FIELD (task, nlines_type) = sel;
rspamd_cryptobox_hash_init (&hs, NULL, 0);
LL_FOREACH (*order_ptr, nh) {
if (nh->name && nh->flags != RSPAMD_HEADER_RECEIVED) {
rspamd_cryptobox_hash_update (&hs, nh->name, strlen (nh->name));
}
}
rspamd_cryptobox_hash_final (&hs, hout);
hexout = rspamd_mempool_alloc (task->task_pool, sizeof (hout) * 2 + 1);
hexout[sizeof (hout) * 2] = '\0';
rspamd_encode_hex_buf (hout, sizeof (hout), hexout,
sizeof (hout) * 2 + 1);
rspamd_mempool_set_variable (task->task_pool,
RSPAMD_MEMPOOL_HEADERS_HASH,
hexout, NULL);
}
}
static void
rspamd_mime_header_maybe_save_token (rspamd_mempool_t *pool,
GString *out,
GByteArray *token,
GByteArray *decoded_token,
rspamd_ftok_t *old_charset,
rspamd_ftok_t *new_charset)
{
if (new_charset->len == 0) {
g_assert_not_reached ();
}
if (old_charset->len > 0) {
if (rspamd_ftok_casecmp (new_charset, old_charset) == 0) {
rspamd_ftok_t srch;
/*
* Special case for iso-2022-jp:
* https://github.com/vstakhov/rspamd/issues/1669
*/
RSPAMD_FTOK_ASSIGN (&srch, "iso-2022-jp");
if (rspamd_ftok_casecmp (new_charset, &srch) != 0) {
/* We can concatenate buffers, just return */
return;
}
}
}
/* We need to flush and decode old token to out string */
if (rspamd_mime_to_utf8_byte_array (token, decoded_token, pool,
rspamd_mime_detect_charset (new_charset, pool))) {
g_string_append_len (out, decoded_token->data, decoded_token->len);
}
/* We also reset buffer */
g_byte_array_set_size (token, 0);
/*
* Propagate charset
*
* Here are dragons: we save the original charset to allow buffers concat
* in the condition at the beginning of the function.
* However, it will likely cause unnecessary calls for
* `rspamd_mime_detect_charset` which could be relatively expensive.
* But we ignore that for now...
*/
memcpy (old_charset, new_charset, sizeof (*old_charset));
}
static void
rspamd_mime_header_sanity_check (GString *str)
{
gsize i;
gchar t;
for (i = 0; i < str->len; i ++) {
t = str->str[i];
if (!((t & 0x80) || g_ascii_isgraph (t))) {
if (g_ascii_isspace (t)) {
/* Replace spaces characters with plain space */
str->str[i] = ' ';
}
else {
str->str[i] = '?';
}
}
}
}
gchar *
rspamd_mime_header_decode (rspamd_mempool_t *pool, const gchar *in,
gsize inlen, gboolean *invalid_utf)
{
GString *out;
const guchar *c, *p, *end;
const gchar *tok_start = NULL;
gsize tok_len = 0, pos;
GByteArray *token = NULL, *decoded;
rspamd_ftok_t cur_charset = {0, NULL}, old_charset = {0, NULL};
gint encoding;
gssize r;
guint qmarks = 0;
gchar *ret;
enum {
parse_normal = 0,
got_eqsign,
got_encoded_start,
got_more_qmark,
skip_spaces,
} state = parse_normal;
g_assert (in != NULL);
c = in;
p = in;
end = in + inlen;
out = g_string_sized_new (inlen);
token = g_byte_array_sized_new (80);
decoded = g_byte_array_sized_new (122);
while (p < end) {
switch (state) {
case parse_normal:
if (*p == '=') {
g_string_append_len (out, c, p - c);
c = p;
state = got_eqsign;
}
else if (*p >= 128) {
gint off = 0;
UChar32 uc;
/* Unencoded character */
g_string_append_len (out, c, p - c);
/* Check if that's valid UTF8 */
U8_NEXT (p, off, end - p, uc);
if (uc <= 0) {
c = p + 1;
/* 0xFFFD in UTF8 */
g_string_append_len (out, " ", 3);
off = 0;
U8_APPEND_UNSAFE (out->str + out->len - 3,
off, 0xfffd);
if (invalid_utf) {
*invalid_utf = TRUE;
}
}
else {
c = p;
p = p + off;
continue; /* To avoid p ++ after this block */
}
}
p ++;
break;
case got_eqsign:
if (*p == '?') {
state = got_encoded_start;
qmarks = 0;
}
else {
g_string_append_len (out, c, 1);
c = p;
state = parse_normal;
continue; /* Deal with == case */
}
p ++;
break;
case got_encoded_start:
if (*p == '?') {
state = got_more_qmark;
qmarks ++;
}
p ++;
break;
case got_more_qmark:
if (*p == '=') {
if (qmarks < 3) {
state = got_encoded_start;
}
else {
/* Finished encoded boundary */
if (*c == '"') {
/* Quoted string, non-RFC conformant but used by retards */
c ++;
}
if (rspamd_rfc2047_parser (c, p - c + 1, &encoding,
&cur_charset.begin, &cur_charset.len,
&tok_start, &tok_len)) {
/* We have a token, so we can decode it from `encoding` */
if (token->len > 0) {
if (old_charset.len == 0) {
memcpy (&old_charset, &cur_charset,
sizeof (old_charset));
}
rspamd_mime_header_maybe_save_token (pool, out,
token, decoded,
&old_charset, &cur_charset);
}
qmarks = 0;
pos = token->len;
g_byte_array_set_size (token, pos + tok_len);
if (encoding == RSPAMD_RFC2047_QP) {
r = rspamd_decode_qp2047_buf (tok_start, tok_len,
token->data + pos, tok_len);
if (r != -1) {
token->len = pos + r;
} else {
/* Cannot decode qp */
token->len -= tok_len;
}
} else {
if (rspamd_cryptobox_base64_decode (tok_start, tok_len,
token->data + pos, &tok_len)) {
token->len = pos + tok_len;
} else {
/* Cannot decode */
token->len -= tok_len;
}
}
c = p + 1;
state = skip_spaces;
} else {
/* Not encoded-word */
old_charset.len = 0;
if (token->len > 0) {
rspamd_mime_header_maybe_save_token (pool, out,
token, decoded,
&old_charset, &cur_charset);
}
g_string_append_len (out, c, p - c);
c = p;
state = parse_normal;
}
} /* qmarks >= 3 */
} /* p == '=' */
else {
state = got_encoded_start;
}
p ++;
break;
case skip_spaces:
if (g_ascii_isspace (*p)) {
p ++;
}
else if (*p == '=' && p < end - 1 && p[1] == '?') {
/* Next boundary, can glue */
c = p;
p += 2;
state = got_encoded_start;
}
else {
/* Need to save spaces and decoded token */
if (token->len > 0) {
old_charset.len = 0;
rspamd_mime_header_maybe_save_token (pool, out,
token, decoded,
&old_charset, &cur_charset);
}
g_string_append_len (out, c, p - c);
c = p;
state = parse_normal;
}
break;
}
}
/* Leftover */
switch (state) {
case skip_spaces:
if (token->len > 0 && cur_charset.len > 0) {
old_charset.len = 0;
rspamd_mime_header_maybe_save_token (pool, out,
token, decoded,
&old_charset, &cur_charset);
}
break;
default:
/* Just copy leftover */
if (p > c) {
g_string_append_len (out, c, p - c);
}
break;
}
g_byte_array_free (token, TRUE);
g_byte_array_free (decoded, TRUE);
rspamd_mime_header_sanity_check (out);
rspamd_mempool_notify_alloc (pool, out->len);
ret = g_string_free (out, FALSE);
rspamd_mempool_add_destructor (pool, g_free, ret);
return ret;
}
gchar *
rspamd_mime_header_encode (const gchar *in, gsize len)
{
const gchar *p = in, *end = in + len;
gchar *out, encode_buf[80 * sizeof (guint32)];
GString *res;
gboolean need_encoding = FALSE;
/* Check if we need to encode */
while (p < end) {
if ((((guchar)*p) & 0x80) != 0) {
need_encoding = TRUE;
break;
}
p ++;
}
if (!need_encoding) {
out = g_malloc (len + 1);
rspamd_strlcpy (out, in, len + 1);
}
else {
/* Need encode */
gsize ulen, pos;
gint r;
const gchar *prev;
/* Choose step: =?UTF-8?Q?<qp>?= should be less than 76 chars */
guint step = (76 - 12) / 3 + 1;
ulen = g_utf8_strlen (in, len);
res = g_string_sized_new (len * 2 + 1);
pos = 0;
prev = in;
/* Adjust chunk size for unicode average length */
step *= 1.0 * ulen / (gdouble)len;
while (pos < ulen) {
p = g_utf8_offset_to_pointer (in, pos);
if (p > prev) {
/* Encode and print */
r = rspamd_encode_qp2047_buf (prev, p - prev,
encode_buf, sizeof (encode_buf));
if (r != -1) {
if (res->len > 0) {
rspamd_printf_gstring (res, " =?UTF-8?Q?%*s?=", r,
encode_buf);
}
else {
rspamd_printf_gstring (res, "=?UTF-8?Q?%*s?=", r,
encode_buf);
}
}
}
pos += MIN (step, ulen - pos);
prev = p;
}
/* Leftover */
if (prev < end) {
r = rspamd_encode_qp2047_buf (prev, end - prev,
encode_buf, sizeof (encode_buf));
if (r != -1) {
if (res->len > 0) {
rspamd_printf_gstring (res, " =?UTF-8?Q?%*s?=", r,
encode_buf);
}
else {
rspamd_printf_gstring (res, "=?UTF-8?Q?%*s?=", r,
encode_buf);
}
}
}
out = g_string_free (res, FALSE);
}
return out;
}
gchar *
rspamd_mime_message_id_generate (const gchar *fqdn)
{
GString *out;
guint64 rnd, clk;
out = g_string_sized_new (strlen (fqdn) + 22);
rnd = ottery_rand_uint64 ();
clk = rspamd_get_calendar_ticks () * 1e6;
rspamd_printf_gstring (out, "%*bs.%*bs@%s",
(gint)sizeof (guint64) - 3, (guchar *)&clk,
(gint)sizeof (guint64), (gchar *)&rnd,
fqdn);
return g_string_free (out, FALSE);
}
enum rspamd_received_part_type {
RSPAMD_RECEIVED_PART_FROM,
RSPAMD_RECEIVED_PART_BY,
RSPAMD_RECEIVED_PART_FOR,
RSPAMD_RECEIVED_PART_WITH,
RSPAMD_RECEIVED_PART_ID,
RSPAMD_RECEIVED_PART_UNKNOWN,
};
struct rspamd_received_comment {
gchar *data;
gsize dlen;
struct rspamd_received_comment *prev;
};
struct rspamd_received_part {
enum rspamd_received_part_type type;
gchar *data;
gsize dlen;
struct rspamd_received_comment *tail_comment;
struct rspamd_received_comment *head_comment;
struct rspamd_received_part *prev, *next;
};
static void
rspamd_smtp_received_part_set_or_append (struct rspamd_task *task,
const gchar *begin,
gsize len,
gchar **dest,
gsize *destlen)
{
if (len == 0) {
return;
}
if (*dest) {
/* Append */
gsize total_len = *destlen + len;
gchar *new_dest;
new_dest = rspamd_mempool_alloc (task->task_pool, total_len);
memcpy (new_dest, *dest, *destlen);
memcpy (new_dest + *destlen, begin, len);
rspamd_str_lc (new_dest + *destlen, len);
*dest = new_dest;
*destlen = total_len;
}
else {
/* Set */
*dest = rspamd_mempool_alloc (task->task_pool, len);
memcpy (*dest, begin, len);
rspamd_str_lc (*dest, len);
*dest = (gchar *)rspamd_string_len_strip (*dest, &len, " \t");
*destlen = len;
}
}
static struct rspamd_received_part *
rspamd_smtp_received_process_part (struct rspamd_task *task,
const char *data,
size_t len,
enum rspamd_received_part_type type,
goffset *last)
{
struct rspamd_received_part *npart;
const guchar *p, *c, *end;
guint obraces = 0, ebraces = 0;
gboolean seen_tcpinfo = FALSE;
enum _parse_state {
skip_spaces,
in_comment,
read_data,
read_tcpinfo,
all_done
} state, next_state;
npart = rspamd_mempool_alloc0 (task->task_pool, sizeof (*npart));
npart->type = type;
/* In this function, we just process comments and data separately */
p = data;
end = data + len;
c = data;
state = skip_spaces;
next_state = read_data;
while (p < end) {
switch (state) {
case skip_spaces:
if (!g_ascii_isspace (*p)) {
c = p;
state = next_state;
}
else {
p ++;
}