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/* Copyright (c) 2006-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "rfc822-parser.h"
#include "message-id.h"
static bool get_untokenized_msgid(const char **msgid_p, string_t *msgid)
{
struct rfc822_parser_context parser;
int ret;
bool success = FALSE;
rfc822_parser_init(&parser, (const unsigned char *)*msgid_p,
strlen(*msgid_p), NULL);
/*
msg-id = [CFWS] "<" id-left "@" id-right ">" [CFWS]
id-left = dot-atom-text / no-fold-quote / obs-id-left
id-right = dot-atom-text / no-fold-literal / obs-id-right
no-fold-quote = DQUOTE *(qtext / quoted-pair) DQUOTE
no-fold-literal = "[" *(dtext / quoted-pair) "]"
*/
rfc822_skip_lwsp(&parser);
if (*parser.data == '"')
ret = rfc822_parse_quoted_string(&parser, msgid);
else
ret = rfc822_parse_dot_atom(&parser, msgid);
if (ret > 0 && *parser.data == '@') {
str_append_c(msgid, '@');
parser.data++;
rfc822_skip_lwsp(&parser);
if (rfc822_parse_dot_atom(&parser, msgid) > 0 &&
*parser.data == '>') {
*msgid_p = (const char *)parser.data + 1;
success = TRUE;
}
}
rfc822_parser_deinit(&parser);
return success;
}
static void strip_lwsp(char *str)
{
/* @UNSAFE */
char *dest;
/* find the first lwsp */
while (*str != ' ' && *str != '\t' && *str != '\r' && *str != '\n') {
if (*str == '\0')
return;
str++;
}
for (dest = str; *str != '\0'; str++) {
if (*str != ' ' && *str != '\t' && *str != '\r' && *str != '\n')
*dest++ = *str;
}
*dest = '\0';
}
const char *message_id_get_next(const char **msgid_p)
{
const char *msgid = *msgid_p;
const char *p;
string_t *str = NULL;
bool found_at;
if (*msgid_p == NULL)
return NULL;
for (;;) {
/* skip until '<' */
while (*msgid != '<') {
if (*msgid == '\0') {
*msgid_p = msgid;
return NULL;
}
msgid++;
}
msgid++;
/* check it through quickly to see if it's already normalized */
p = msgid; found_at = FALSE;
for (;; p++) {
if ((unsigned char)*p >= 'A') /* matches most */
continue;
if (*p == '@')
found_at = TRUE;
if (*p == '>' || *p == '"' || *p == '(' || *p == '[')
break;
if (*p == '\0') {
*msgid_p = p;
return NULL;
}
}
if (*p == '>') {
*msgid_p = p+1;
if (found_at) {
char *s;
s = p_strdup_until(unsafe_data_stack_pool,
msgid, p);
strip_lwsp(s);
return s;
}
} else {
/* ok, do it the slow way */
*msgid_p = msgid;
if (str == NULL) {
/* allocate only once, so we don't leak
with multiple invalid message IDs */
str = t_str_new(256);
}
if (get_untokenized_msgid(msgid_p, str))
return str_c(str);
}
/* invalid message id, see if there's another valid one */
msgid = *msgid_p;
}
}
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