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/*-
* Copyright 2019 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 "libutil/http_util.h"
#include "libutil/printf.h"
#include "libutil/util.h"
static const gchar *http_week[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
static const gchar *http_month[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
glong
rspamd_http_date_format (gchar *buf, gsize len, time_t time)
{
struct tm tms;
rspamd_gmtime (time, &tms);
return rspamd_snprintf (buf, len, "%s, %02d %s %4d %02d:%02d:%02d GMT",
http_week[tms.tm_wday], tms.tm_mday,
http_month[tms.tm_mon], tms.tm_year + 1900,
tms.tm_hour, tms.tm_min, tms.tm_sec);
}
void
rspamd_http_normalize_path_inplace (gchar *path, guint len, guint *nlen)
{
const gchar *p, *end, *slash = NULL, *dot = NULL;
gchar *o;
enum {
st_normal = 0,
st_got_dot,
st_got_dot_dot,
st_got_slash,
st_got_slash_slash,
} state = st_normal;
p = path;
end = path + len;
o = path;
while (p < end) {
switch (state) {
case st_normal:
if (G_UNLIKELY (*p == '/')) {
state = st_got_slash;
slash = p;
}
else if (G_UNLIKELY (*p == '.')) {
state = st_got_dot;
dot = p;
}
else {
*o++ = *p;
}
p ++;
break;
case st_got_slash:
if (G_UNLIKELY (*p == '/')) {
/* Ignore double slash */
*o++ = *p;
state = st_got_slash_slash;
}
else if (G_UNLIKELY (*p == '.')) {
dot = p;
state = st_got_dot;
}
else {
*o++ = '/';
*o++ = *p;
slash = NULL;
dot = NULL;
state = st_normal;
}
p ++;
break;
case st_got_slash_slash:
if (G_LIKELY (*p != '/')) {
slash = p - 1;
dot = NULL;
state = st_normal;
continue;
}
p ++;
break;
case st_got_dot:
if (G_UNLIKELY (*p == '/')) {
/* Remove any /./ or ./ paths */
if (((o > path && *(o - 1) != '/') || (o == path)) && slash) {
/* Preserve one slash */
*o++ = '/';
}
slash = p;
dot = NULL;
/* Ignore last slash */
state = st_normal;
}
else if (*p == '.') {
/* Double dot character */
state = st_got_dot_dot;
}
else {
/* We have something like .some or /.some */
if (dot && p > dot) {
if (slash == dot - 1 && (o > path && *(o - 1) != '/')) {
/* /.blah */
memmove (o, slash, p - slash);
o += p - slash;
}
else {
memmove (o, dot, p - dot);
o += p - dot;
}
}
slash = NULL;
dot = NULL;
state = st_normal;
continue;
}
p ++;
break;
case st_got_dot_dot:
if (*p == '/') {
/* We have something like /../ or ../ */
if (slash) {
/* We need to remove the last component from o if it is there */
if (o > path + 2 && *(o - 1) == '/') {
slash = rspamd_memrchr (path, '/', o - path - 2);
}
else if (o > path + 1) {
slash = rspamd_memrchr (path, '/', o - path - 1);
}
else {
slash = NULL;
}
if (slash) {
o = (gchar *)slash;
}
/* Otherwise we keep these dots */
slash = p;
state = st_got_slash;
}
else {
/* We have something like bla../, so we need to copy it as is */
if (o > path && dot && p > dot) {
memmove (o, dot, p - dot);
o += p - dot;
}
slash = NULL;
dot = NULL;
state = st_normal;
continue;
}
}
else {
/* We have something like ..bla or ... */
if (slash) {
*o ++ = '/';
}
if (dot && p > dot) {
memmove (o, dot, p - dot);
o += p - dot;
}
slash = NULL;
dot = NULL;
state = st_normal;
continue;
}
p ++;
break;
}
}
/* Leftover */
switch (state) {
case st_got_dot_dot:
/* Trailing .. */
if (slash) {
/* We need to remove the last component from o if it is there */
if (o > path + 2 && *(o - 1) == '/') {
slash = rspamd_memrchr (path, '/', o - path - 2);
}
else if (o > path + 1) {
slash = rspamd_memrchr (path, '/', o - path - 1);
}
else {
if (o == path) {
/* Corner case */
*o++ = '/';
}
slash = NULL;
}
if (slash) {
/* Remove last / */
o = (gchar *)slash;
}
}
else {
/* Corner case */
if (o == path) {
*o++ = '/';
}
else {
if (dot && p > dot) {
memmove (o, dot, p - dot);
o += p - dot;
}
}
}
break;
case st_got_slash:
*o++ = '/';
break;
default:
if (o > path + 1 && *(o - 1) == '/') {
o --;
}
break;
}
if (nlen) {
*nlen = (o - path);
}
}
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