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lighttpd1.4/src/mod_webdav.c

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#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "response.h"
#include "plugin.h"
#include "config.h"
/**
* this is a webdav for a lighttpd plugin
*
* at least a very basic one.
* - for now it is read-only and we only support PROPFIND
*
*/
/* plugin config for all request/connections */
typedef struct {
unsigned short enabled;
unsigned short is_readonly;
} plugin_config;
typedef struct {
PLUGIN_DATA;
buffer *tmp_buf;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
/* init the plugin data */
INIT_FUNC(mod_webdav_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->tmp_buf = buffer_init();
return p;
}
/* detroy the plugin data */
FREE_FUNC(mod_webdav_free) {
plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
if (!s) continue;
free(s);
}
free(p->config_storage);
}
buffer_free(p->tmp_buf);
free(p);
return HANDLER_GO_ON;
}
/* handle plugin config and check values */
SETDEFAULTS_FUNC(mod_webdav_set_defaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ "webdav.activate", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ "webdav.is-readonly", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
if (!p) return HANDLER_ERROR;
p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
cv[0].destination = &(s->enabled);
cv[1].destination = &(s->is_readonly);
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
return HANDLER_ERROR;
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_webdav_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(enabled);
PATCH(is_readonly);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("webdav.activate"))) {
PATCH(enabled);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("webdav.is-readonly"))) {
PATCH(is_readonly);
}
}
}
return 0;
}
#undef PATCH
URIHANDLER_FUNC(mod_webdav_uri_handler) {
plugin_data *p = p_d;
UNUSED(srv);
if (con->uri.path->used == 0) return HANDLER_GO_ON;
mod_webdav_patch_connection(srv, con, p);
if (!p->conf.enabled) return HANDLER_GO_ON;
switch (con->request.http_method) {
case HTTP_METHOD_OPTIONS:
/* we fake a little bit but it makes MS W2k happy and it let's us mount the volume */
response_header_overwrite(srv, con, CONST_STR_LEN("DAV"), CONST_STR_LEN("1,2"));
response_header_overwrite(srv, con, CONST_STR_LEN("MS-Author-Via"), CONST_STR_LEN("DAV"));
if (p->conf.is_readonly) {
response_header_insert(srv, con, CONST_STR_LEN("Allow"), CONST_STR_LEN("PROPFIND"));
} else {
response_header_insert(srv, con, CONST_STR_LEN("Allow"), CONST_STR_LEN("PROPFIND, DELETE, MKCOL"));
}
break;
default:
break;
}
/* not found */
return HANDLER_GO_ON;
}
static int get_response_entry(server *srv, connection *con, plugin_data *p, buffer *b, const char *filename) {
struct stat st;
UNUSED(srv);
buffer_append_string(b,"<D:response xmlns:ns0=\"urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/\">\n");
buffer_append_string(b,"<D:href>\n");
buffer_append_string_buffer(b, con->uri.path);
BUFFER_APPEND_SLASH(b);
buffer_append_string(b, filename);
buffer_append_string(b,"</D:href>\n");
buffer_append_string(b,"<D:propstat>\n");
/* we have to stat now */
buffer_copy_string_buffer(p->tmp_buf, con->physical.path);
BUFFER_APPEND_SLASH(p->tmp_buf);
buffer_append_string(p->tmp_buf, filename);
if (0 == stat(p->tmp_buf->ptr, &st)) {
char ctime_buf[] = "2005-08-18T07:27:16Z";
char mtime_buf[] = "Thu, 18 Aug 2005 07:27:16 GMT";
size_t k;
buffer_append_string(b,"<D:prop>\n");
if (S_ISDIR(st.st_mode)) {
buffer_append_string(b, "<D:resourcetype><D:collection/></D:resourcetype>"
"<D:getcontenttype>httpd/unix-directory</D:getcontenttype>\n");
}
buffer_append_string(b, "<D:creationdate ns0:dt=\"dateTime.tz\">");
strftime(ctime_buf, sizeof(ctime_buf), "%Y-%m-%dT%H:%M:%SZ", gmtime(&st.st_ctime));
buffer_append_string(b, ctime_buf);
buffer_append_string(b, "</D:creationdate>");
buffer_append_string(b,"<D:getlastmodified ns0:dt=\"dateTime.rfc1123\">");
strftime(mtime_buf, sizeof(mtime_buf), "%a, %d %b %Y %H:%M:%S GMT", gmtime(&st.st_mtime));
buffer_append_string(b, mtime_buf);
buffer_append_string(b, "</D:getlastmodified>");
buffer_append_string(b,"<D:getcontentlength>");
buffer_append_off_t(b, st.st_size);
buffer_append_string(b, "</D:getcontentlength>");
buffer_append_string(b,"<D:getcontentlanguage>");
buffer_append_string(b, "en");
buffer_append_string(b, "</D:getcontentlanguage>");
for (k = 0; k < con->conf.mimetypes->used; k++) {
data_string *ds = (data_string *)con->conf.mimetypes->data[k];
if (ds->key->used == 0) continue;
if (buffer_is_equal_right_len(p->tmp_buf, ds->key, ds->key->used - 1)) {
buffer_append_string(b,"<D:contenttype>");
buffer_append_string_buffer(b, ds->value);
buffer_append_string(b, "</D:contenttype>");
break;
}
}
buffer_append_string(b,"</D:prop>\n");
buffer_append_string(b,"<D:status>HTTP/1.1 200 OK</D:status>\n");
} else {
buffer_append_string(b,"<D:status>HTTP/1.1 404 Not Found</D:status>\n");
}
buffer_append_string(b,"</D:propstat>\n");
buffer_append_string(b,"</D:response>\n");
return 0;
}
static int webdav_unlink_dir(server *srv, connection *con, buffer *subdir, buffer *b) {
DIR *dir;
buffer *dirname;
int have_multi_status = 0;
dirname = buffer_init();
buffer_copy_string_buffer(dirname, con->physical.path);
BUFFER_APPEND_SLASH(dirname);
if (subdir) buffer_append_string_buffer(dirname, subdir);
if (NULL != (dir = opendir(dirname->ptr))) {
struct dirent *de;
while(NULL != (de = readdir(dir))) {
if (de->d_name[0] == '.' && de->d_name[1] == '\0') {
/* ignore the current dir */
} else if (de->d_name[0] == '.' && de->d_name[1] == '.' && de->d_name[2] == '\0') {
/* ignore the parent dir */
} else {
struct stat st;
buffer *next_subdir = buffer_init();
int status = 0;
if (subdir) {
buffer_copy_string_buffer(next_subdir, subdir);
} else {
buffer_copy_string(next_subdir, "/");
}
BUFFER_APPEND_SLASH(next_subdir);
buffer_append_string(next_subdir, de->d_name);
/* physical name of the resource */
buffer_copy_string_buffer(dirname, con->physical.path);
BUFFER_APPEND_SLASH(dirname);
buffer_append_string_buffer(dirname, next_subdir);
/* stat and unlink afterwards */
if (-1 == stat(dirname->ptr, &st)) {
/* don't about it yet, unlink will fail too */
} else if (S_ISDIR(st.st_mode)) {
have_multi_status = webdav_unlink_dir(srv, con, next_subdir, b);
/* try to unlink it */
if (-1 == rmdir(dirname->ptr)) {
switch(errno) {
case EACCES:
case EPERM:
/* 403 */
status = 403;
break;
default:
status = 501;
break;
}
} else {
status = 0;
}
} else {
/* try to unlink it */
if (-1 == unlink(dirname->ptr)) {
switch(errno) {
case EACCES:
case EPERM:
/* 403 */
status = 403;
break;
default:
status = 501;
break;
}
} else {
status = 0;
}
}
if (status) {
have_multi_status = 1;
buffer_append_string(b,"<D:response xmlns:ns0=\"urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/\">\n");
buffer_append_string(b,"<D:href>\n");
buffer_append_string_buffer(b, con->uri.path);
BUFFER_APPEND_SLASH(b);
buffer_append_string_buffer(b, next_subdir);
buffer_append_string(b,"</D:href>\n");
buffer_append_string(b,"<D:status>\n");
if (con->request.http_version == HTTP_VERSION_1_1) {
BUFFER_COPY_STRING_CONST(b, "HTTP/1.1 ");
} else {
BUFFER_COPY_STRING_CONST(b, "HTTP/1.0 ");
}
buffer_append_long(b, status);
BUFFER_APPEND_STRING_CONST(b, " ");
buffer_append_string(b, get_http_status_name(status));
buffer_append_string(b,"</D:status>\n");
buffer_append_string(b,"</D:response>\n");
}
buffer_free(next_subdir);
}
}
closedir(dir);
}
buffer_free(dirname);
return have_multi_status;
}
URIHANDLER_FUNC(mod_webdav_subrequest_handler) {
plugin_data *p = p_d;
buffer *b;
DIR *dir;
data_string *ds;
int depth = -1;
struct stat st;
UNUSED(srv);
if (!p->conf.enabled) return HANDLER_GO_ON;
/* physical path is setup */
if (con->physical.path->used == 0) return HANDLER_GO_ON;
/* PROPFIND and DELETE need them */
if (NULL != (ds = (data_string *)array_get_element(con->request.headers, "Depth"))) {
depth = strtol(ds->value->ptr, NULL, 10);
}
switch (con->request.http_method) {
case HTTP_METHOD_PROPFIND:
/* they want to know the properties of the directory */
con->http_status = 207;
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("text/xml; charset=\"utf-8\""));
b = chunkqueue_get_append_buffer(con->write_queue);
buffer_copy_string(b, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
buffer_append_string(b,"<D:multistatus xmlns:D=\"DAV:\">\n");
switch(depth) {
case 0:
/* Depth: 0 */
get_response_entry(srv, con, p, b, "");
break;
case 1:
if (NULL != (dir = opendir(con->physical.path->ptr))) {
struct dirent *de;
while(NULL != (de = readdir(dir))) {
if (de->d_name[0] == '.' && de->d_name[1] == '\0') {
/* ignore the current dir */
} else if (de->d_name[0] == '.' && de->d_name[1] == '.' && de->d_name[2] == '\0') {
/* ignore the parent dir */
} else {
get_response_entry(srv, con, p, b, de->d_name);
}
}
closedir(dir);
}
break;
}
buffer_append_string(b,"</D:multistatus>\n");
con->file_finished = 1;
return HANDLER_FINISHED;
case HTTP_METHOD_MKCOL:
if (p->conf.is_readonly) break;
if (con->request.content_length != 0) {
/* we don't support MKCOL with a body */
con->http_status = 415;
return HANDLER_FINISHED;
}
/* let's create the directory */
if (-1 == mkdir(con->physical.path->ptr, 0700)) {
switch(errno) {
case EPERM:
con->http_status = 403;
break;
case ENOENT:
case ENOTDIR:
con->http_status = 409;
break;
case EEXIST:
default:
con->http_status = 405; /* not allowed */
break;
}
} else {
con->http_status = 201;
}
return HANDLER_FINISHED;
case HTTP_METHOD_DELETE:
if (p->conf.is_readonly) break;
/* stat and unlink afterwards */
if (-1 == stat(con->physical.path->ptr, &st)) {
/* don't about it yet, unlink will fail too */
switch(errno) {
case ENOENT:
con->http_status = 404;
break;
default:
con->http_status = 403;
break;
}
} else if (S_ISDIR(st.st_mode)) {
buffer *multi_status_resp = buffer_init();
if (webdav_unlink_dir(srv, con, NULL, multi_status_resp)) {
/* we got an error somewhere in between, build a 207 */
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("text/xml; charset=\"utf-8\""));
b = chunkqueue_get_append_buffer(con->write_queue);
buffer_copy_string(b, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
buffer_append_string(b,"<D:multistatus xmlns:D=\"DAV:\">\n");
buffer_append_string_buffer(b, multi_status_resp);
buffer_append_string(b,"</D:multistatus>\n");
con->http_status = 207;
con->file_finished = 1;
} else {
/* everything went fine, remove the directory */
if (-1 == rmdir(con->physical.path->ptr)) {
switch(errno) {
case ENOENT:
con->http_status = 404;
break;
default:
con->http_status = 501;
break;
}
} else {
con->http_status = 204;
}
}
buffer_free(multi_status_resp);
} else if (-1 == unlink(con->physical.path->ptr)) {
switch(errno) {
case EPERM:
con->http_status = 403;
break;
case ENOENT:
con->http_status = 404;
break;
default:
con->http_status = 501;
break;
}
} else {
con->http_status = 204;
}
return HANDLER_FINISHED;
default:
break;
}
/* not found */
return HANDLER_GO_ON;
}
/* this function is called at dlopen() time and inits the callbacks */
int mod_webdav_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("webdav");
p->init = mod_webdav_init;
p->handle_uri_clean = mod_webdav_uri_handler;
p->handle_physical = mod_webdav_subrequest_handler;
p->set_defaults = mod_webdav_set_defaults;
p->cleanup = mod_webdav_free;
p->data = NULL;
return 0;
}
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