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/* $Id$ */
/***
Copyright 2004 Lennart Poettering
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 <sys/types.h>
#include <attr/xattr.h>
#include <ctype.h>
#include "httpd.h"
#include "http_config.h"
#include "http_core.h"
#include "http_log.h"
#include "http_main.h"
#include "http_protocol.h"
#include "http_request.h"
#include "ap_config.h"
#define XATTR_NAME_MIMETYPE "user.mime_type"
#define XATTR_NAME_MIMETYPE2 "user.mime-type"
#define XATTR_NAME_ENCODING "user.mime_encoding"
#define XATTR_NAME_ENCODING2 "user.mime-encoding"
#define XATTR_NAME_CHARSET "user.charset"
#define XATTR_NAME_HANDLER "user.apache_handler"
#define XATTR_NAME_HANDLER2 "user.apache-handler"
module MODULE_VAR_EXPORT mime_xattr_module;
struct mime_xattr_dir_config {
int enable_mime_type;
int enable_handler;
};
static void* create_mime_xattr_dir_config(pool *p, char*dummy) {
struct mime_xattr_dir_config *c = (struct mime_xattr_dir_config*) ap_palloc(p, sizeof(struct mime_xattr_dir_config));
c->enable_mime_type = 0;
c->enable_handler = 0;
return c;
}
static const char *enable_xattr_mime_type(cmd_parms *parms, void *mconfig, int flag) {
struct mime_xattr_dir_config *c = (struct mime_xattr_dir_config*) mconfig;
c->enable_mime_type = flag;
return NULL;
}
static const char *enable_xattr_handler(cmd_parms *parms, void *mconfig, int flag) {
struct mime_xattr_dir_config *c = (struct mime_xattr_dir_config*) mconfig;
c->enable_handler = flag;
return NULL;
}
static const command_rec mime_xattr_cmds[] = {
{"XAttrMimeType",
enable_xattr_mime_type,
NULL,
OR_FILEINFO,
FLAG,
"Requires 'On' or 'Off' for enabling resp. disabling usage of file system extended attribute data for MIME type detection." },
{"XAttrHandler",
enable_xattr_handler,
NULL,
OR_FILEINFO,
FLAG,
"Requires 'On' or 'Off' for enabling resp. disabling usage of file system extended attribute data for handler detection." },
{ NULL }
};
static char* get_xattr(pool *p, const char *fn, const char *attr) {
char v[256];
ssize_t l;
if ((l = lgetxattr(fn, attr, v, sizeof(v)-1)) < 0)
if ((l = getxattr(fn, attr, v, sizeof(v)-1)) < 0)
return NULL;
v[l] = 0;
return ap_pstrdup(p, v);
}
static char* validate_charset(char *f) {
char *c;
for (c = f; *c; c++) {
*c = tolower(*c);
if (!(*c >= 'a' && *c <= 'z') && !(*c >= '0' && *c <= '9') && *c != '-')
return NULL;
}
return c > f ? f : NULL;
}
#define validate_encoding(f) validate_charset(f)
#define validate_handler(f) validate_charset(f)
static char* validate_mime_type(char *f) {
char *c, *slash = NULL;
for (c = f; *c; c++) {
*c = tolower(*c);
if (*c == '/') {
if (!slash && c > f) {
slash = c;
continue;
} else
return NULL;
}
if (!(*c >= 'a' && *c <= 'z') && !(*c >= '0' && *c <= '9') && *c != '-')
return NULL;
}
return c > f && slash && slash < c-1 ? f : NULL;
}
static int find_ct(request_rec *r) {
int result = DECLINED;
struct mime_xattr_dir_config* c;
if (r->finfo.st_mode == 0 || !r->filename || !S_ISREG(r->finfo.st_mode))
return DECLINED;
c = (struct mime_xattr_dir_config*) ap_get_module_config(r->per_dir_config, &mime_xattr_module);
if (c->enable_mime_type) {
char *mime_type, *charset, *encoding;
if ((charset = get_xattr(r->pool, r->filename, XATTR_NAME_CHARSET)))
if (!(charset = validate_charset(charset)))
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r->server, "mod_mime_xattr: bad charset specification on file <%s>", r->filename);
if (!(mime_type = get_xattr(r->pool, r->filename, XATTR_NAME_MIMETYPE)))
mime_type = get_xattr(r->pool, r->filename, XATTR_NAME_MIMETYPE2);
if (mime_type) {
if (!(mime_type = validate_mime_type(mime_type)))
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r->server, "mod_mime_xattr: bad mime type specification on file <%s>", r->filename);
else {
if (charset)
mime_type = ap_psprintf(r->pool, "%s; charset=%s", mime_type, charset);
r->content_type = mime_type;
result = OK;
}
}
if (charset && !mime_type && r->content_type) {
char *a, *ct = ap_pstrdup(r->pool, r->content_type);
static const char spec[] = "; charset=";
if ((a = strstr(ct, spec))) {
char *e;
e = a+strlen(spec);
e += strcspn(e, "; ");
*a = 0;
r->content_type = ap_psprintf(r->pool, "%s; charset=%s%s", ct, charset, e);
} else
r->content_type = ap_psprintf(r->pool, "%s; charset=%s", ct, charset);
}
if (!(encoding = get_xattr(r->pool, r->filename, XATTR_NAME_ENCODING)))
encoding = get_xattr(r->pool, r->filename, XATTR_NAME_ENCODING2);
if (encoding) {
if (!(encoding = validate_encoding(encoding)))
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r->server, "mod_mime_xattr: bad encoding specification on file <%s>", r->filename);
else
r->content_encoding = encoding;
}
}
if (c->enable_handler) {
char *handler;
if (!(handler = get_xattr(r->pool, r->filename, XATTR_NAME_HANDLER)))
handler = get_xattr(r->pool, r->filename, XATTR_NAME_HANDLER2);
if (handler) {
if (!(handler = validate_handler(handler)))
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r->server, "mod_mime_xattr: bad apache handler specification on file <%s>", r->filename);
else {
r->handler = handler;
result = OK;
}
}
}
return result;
}
/* Dispatch list for API hooks */
module MODULE_VAR_EXPORT mime_xattr_module = {
STANDARD_MODULE_STUFF,
NULL, /* module initializer */
create_mime_xattr_dir_config, /* create per-dir config structures */
NULL, /* merge per-dir config structures */
NULL, /* create per-server config structures */
NULL, /* merge per-server config structures */
mime_xattr_cmds, /* table of config file commands */
NULL, /* [#8] MIME-typed-dispatched handlers */
NULL, /* [#1] URI to filename translation */
NULL, /* [#4] validate user id from request */
NULL, /* [#5] check if the user is ok _here_ */
NULL, /* [#3] check access by host address */
find_ct, /* [#6] determine MIME type */
NULL, /* [#7] pre-run fixups */
NULL, /* [#9] log a transaction */
NULL, /* [#2] header parser */
NULL, /* child_init */
NULL, /* child_exit */
NULL /* [#0] post read-request */
#ifdef EAPI
,NULL, /* EAPI: add_module */
NULL, /* EAPI: remove_module */
NULL, /* EAPI: rewrite_command */
NULL /* EAPI: new_connection */
#endif
};
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