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|
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*-
*
* Copyright (C) 2011,2013 Colin Walters <walters@verbum.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <libsoup/soup.h>
#include "ot-builtins.h"
#include "ostree.h"
#include "otutil.h"
#include <sys/socket.h>
static char *opt_port_file = NULL;
static gboolean opt_daemonize;
static gboolean opt_autoexit;
static gboolean opt_force_ranges;
typedef struct {
GFile *root;
gboolean running;
} OtTrivialHttpd;
static GOptionEntry options[] = {
{ "daemonize", 'd', 0, G_OPTION_ARG_NONE, &opt_daemonize, "Fork into background when ready", NULL },
{ "autoexit", 0, 0, G_OPTION_ARG_NONE, &opt_autoexit, "Automatically exit when directory is deleted", NULL },
{ "port-file", 'p', 0, G_OPTION_ARG_FILENAME, &opt_port_file, "Write port number to PATH (- for standard output)", "PATH" },
{ "force-range-requests", 0, 0, G_OPTION_ARG_NONE, &opt_force_ranges, "Force range requests by only serving half of files", NULL },
{ NULL }
};
static int
compare_strings (gconstpointer a, gconstpointer b)
{
const char **sa = (const char **)a;
const char **sb = (const char **)b;
return strcmp (*sa, *sb);
}
static GString *
get_directory_listing (const char *path)
{
GPtrArray *entries;
GString *listing;
char *escaped;
DIR *dir;
struct dirent *dent;
int i;
entries = g_ptr_array_new ();
dir = opendir (path);
if (dir)
{
while ((dent = readdir (dir)))
{
if (!strcmp (dent->d_name, ".") ||
(!strcmp (dent->d_name, "..") &&
!strcmp (path, "./")))
continue;
escaped = g_markup_escape_text (dent->d_name, -1);
g_ptr_array_add (entries, escaped);
}
closedir (dir);
}
g_ptr_array_sort (entries, (GCompareFunc)compare_strings);
listing = g_string_new ("<html>\r\n");
escaped = g_markup_escape_text (strchr (path, '/'), -1);
g_string_append_printf (listing, "<head><title>Index of %s</title></head>\r\n", escaped);
g_string_append_printf (listing, "<body><h1>Index of %s</h1>\r\n<p>\r\n", escaped);
g_free (escaped);
for (i = 0; i < entries->len; i++)
{
g_string_append_printf (listing, "<a href=\"%s\">%s</a><br>\r\n",
(char *)entries->pdata[i],
(char *)entries->pdata[i]);
g_free (entries->pdata[i]);
}
g_string_append (listing, "</body>\r\n</html>\r\n");
g_ptr_array_free (entries, TRUE);
return listing;
}
/* Only allow reading files that have o+r, and for directories, o+x.
* This makes this server relatively safe to use on multiuser
* machines.
*/
static gboolean
is_safe_to_access (struct stat *stbuf)
{
/* Only regular files or directores */
if (!(S_ISREG (stbuf->st_mode) || S_ISDIR (stbuf->st_mode)))
return FALSE;
/* Must be o+r */
if (!(stbuf->st_mode & S_IROTH))
return FALSE;
/* For directories, must be o+x */
if (S_ISDIR (stbuf->st_mode) && !(stbuf->st_mode & S_IXOTH))
return FALSE;
return TRUE;
}
static void
close_socket (SoupMessage *msg, gpointer user_data)
{
SoupSocket *sock = user_data;
int sockfd;
/* Actually calling soup_socket_disconnect() here would cause
* us to leak memory, so just shutdown the socket instead.
*/
sockfd = soup_socket_get_fd (sock);
#ifdef G_OS_WIN32
shutdown (sockfd, SD_SEND);
#else
shutdown (sockfd, SHUT_WR);
#endif
}
static void
do_get (OtTrivialHttpd *self,
SoupServer *server,
SoupMessage *msg,
const char *path,
SoupClientContext *context)
{
char *slash;
int ret;
struct stat stbuf;
gs_free char *safepath = NULL;
if (strstr (path, "../") != NULL)
{
soup_message_set_status (msg, SOUP_STATUS_FORBIDDEN);
goto out;
}
if (path[0] == '/')
path++;
safepath = g_build_filename (gs_file_get_path_cached (self->root), path, NULL);
do
ret = stat (safepath, &stbuf);
while (ret == -1 && errno == EINTR);
if (ret == -1)
{
if (errno == EPERM)
soup_message_set_status (msg, SOUP_STATUS_FORBIDDEN);
else if (errno == ENOENT)
soup_message_set_status (msg, SOUP_STATUS_NOT_FOUND);
else
soup_message_set_status (msg, SOUP_STATUS_INTERNAL_SERVER_ERROR);
goto out;
}
if (!is_safe_to_access (&stbuf))
{
soup_message_set_status (msg, SOUP_STATUS_FORBIDDEN);
goto out;
}
if (S_ISDIR (stbuf.st_mode))
{
slash = strrchr (safepath, '/');
if (!slash || slash[1])
{
gs_free char *redir_uri = NULL;
redir_uri = g_strdup_printf ("%s/", soup_message_get_uri (msg)->path);
soup_message_set_redirect (msg, SOUP_STATUS_MOVED_PERMANENTLY,
redir_uri);
}
else
{
gs_free char *index_realpath = g_strconcat (safepath, "/index.html", NULL);
if (stat (index_realpath, &stbuf) != -1)
{
gs_free char *index_path = g_strconcat (path, "/index.html", NULL);
do_get (self, server, msg, index_path, context);
}
else
{
GString *listing = get_directory_listing (safepath);
soup_message_set_response (msg, "text/html",
SOUP_MEMORY_TAKE,
listing->str, listing->len);
g_string_free (listing, FALSE);
}
}
}
else
{
if (!S_ISREG (stbuf.st_mode))
{
soup_message_set_status (msg, SOUP_STATUS_FORBIDDEN);
goto out;
}
if (msg->method == SOUP_METHOD_GET)
{
GMappedFile *mapping;
SoupBuffer *buffer;
gsize buffer_length, file_size;
SoupRange *ranges;
int ranges_length;
gboolean have_ranges;
mapping = g_mapped_file_new (safepath, FALSE, NULL);
if (!mapping)
{
soup_message_set_status (msg, SOUP_STATUS_INTERNAL_SERVER_ERROR);
goto out;
}
file_size = g_mapped_file_get_length (mapping);
have_ranges = soup_message_headers_get_ranges(msg->request_headers, file_size, &ranges, &ranges_length);
if (opt_force_ranges && !have_ranges && g_strrstr (path, "/objects") != NULL)
{
SoupSocket *sock;
buffer_length = file_size/2;
soup_message_headers_set_content_length (msg->response_headers, file_size);
soup_message_headers_append (msg->response_headers,
"Connection", "close");
/* soup-message-io will wait for us to add
* another chunk after the first, to fill out
* the declared Content-Length. Instead, we
* forcibly close the socket at that point.
*/
sock = soup_client_context_get_socket (context);
g_signal_connect (msg, "wrote-chunk", G_CALLBACK (close_socket), sock);
}
else
buffer_length = file_size;
if (have_ranges)
{
if (ranges_length > 0 && ranges[0].start >= file_size)
{
soup_message_set_status (msg, SOUP_STATUS_REQUESTED_RANGE_NOT_SATISFIABLE);
soup_message_headers_free_ranges (msg->request_headers, ranges);
goto out;
}
soup_message_headers_free_ranges (msg->request_headers, ranges);
}
buffer = soup_buffer_new_with_owner (g_mapped_file_get_contents (mapping),
buffer_length,
mapping, (GDestroyNotify)g_mapped_file_unref);
soup_message_body_append_buffer (msg->response_body, buffer);
soup_buffer_free (buffer);
}
else /* msg->method == SOUP_METHOD_HEAD */
{
gs_free char *length = NULL;
/* We could just use the same code for both GET and
* HEAD (soup-message-server-io.c will fix things up).
* But we'll optimize and avoid the extra I/O.
*/
length = g_strdup_printf ("%lu", (gulong)stbuf.st_size);
soup_message_headers_append (msg->response_headers,
"Content-Length", length);
}
soup_message_set_status (msg, SOUP_STATUS_OK);
}
out:
return;
}
static void
httpd_callback (SoupServer *server, SoupMessage *msg,
const char *path, GHashTable *query,
SoupClientContext *context, gpointer data)
{
OtTrivialHttpd *self = data;
SoupMessageHeadersIter iter;
soup_message_headers_iter_init (&iter, msg->request_headers);
if (msg->method == SOUP_METHOD_GET || msg->method == SOUP_METHOD_HEAD)
do_get (self, server, msg, path, context);
else
soup_message_set_status (msg, SOUP_STATUS_NOT_IMPLEMENTED);
}
static void
on_dir_changed (GFileMonitor *mon,
GFile *file,
GFile *other,
GFileMonitorEvent event,
gpointer user_data)
{
OtTrivialHttpd *self = user_data;
if (event == G_FILE_MONITOR_EVENT_DELETED)
{
self->running = FALSE;
g_main_context_wakeup (NULL);
}
}
gboolean
ostree_builtin_trivial_httpd (int argc, char **argv, OstreeRepo *repo, GCancellable *cancellable, GError **error)
{
gboolean ret = FALSE;
GOptionContext *context;
const char *dirpath;
OtTrivialHttpd appstruct = { 0, };
OtTrivialHttpd *app = &appstruct;
gs_unref_object SoupServer *server = NULL;
gs_unref_object GFileMonitor *dirmon = NULL;
context = g_option_context_new ("[DIR] - Simple webserver");
g_option_context_add_main_entries (context, options, NULL);
if (!g_option_context_parse (context, &argc, &argv, error))
goto out;
if (argc > 1)
dirpath = argv[1];
else
dirpath = ".";
app->root = g_file_new_for_path (dirpath);
#if SOUP_CHECK_VERSION(2, 48, 0)
server = soup_server_new (SOUP_SERVER_SERVER_HEADER, "ostree-httpd ", NULL);
if (!soup_server_listen_local (server, 0, 0, error))
goto out;
#else
server = soup_server_new (SOUP_SERVER_PORT, 0,
SOUP_SERVER_SERVER_HEADER, "ostree-httpd ",
NULL);
#endif
soup_server_add_handler (server, NULL, httpd_callback, app, NULL);
if (opt_port_file)
{
gs_free char *portstr = NULL;
#if SOUP_CHECK_VERSION(2, 48, 0)
GSList *listeners = soup_server_get_listeners (server);
gs_unref_object GSocket *listener = NULL;
gs_unref_object GSocketAddress *addr = NULL;
g_assert (listeners);
listener = g_object_ref (listeners->data);
g_slist_free (listeners);
listeners = NULL;
addr = g_socket_get_local_address (listener, error);
if (!addr)
goto out;
g_assert (G_IS_INET_ADDRESS (addr));
g_strdup_printf ("%u\n", g_inet_socket_address_get_port ((GInetSocketAddress*)addr));
#else
g_strdup_printf ("%u\n", soup_server_get_port (server));
#endif
if (g_strcmp0 ("-", opt_port_file) == 0)
{
fputs (portstr, stdout); // not g_print - this must go to stdout, not a handler
fflush (stdout);
}
else if (!g_file_set_contents (opt_port_file, portstr, strlen (portstr), error))
goto out;
}
#if !SOUP_CHECK_VERSION(2, 48, 0)
soup_server_run_async (server);
#endif
if (opt_daemonize)
{
pid_t pid = fork();
if (pid == -1)
{
int errsv = errno;
g_set_error_literal (error, G_IO_ERROR, g_io_error_from_errno (errsv),
g_strerror (errsv));
goto out;
}
else if (pid > 0)
{
/* Parent */
_exit (0);
}
/* Child, continue */
/* Daemonising: close stdout/stderr so $() et al work on us */
fclose (stdout);
fclose (stdin);
}
app->running = TRUE;
if (opt_autoexit)
{
gboolean is_symlink = FALSE;
gs_unref_object GFileInfo *info = NULL;
info = g_file_query_info (app->root,
G_FILE_ATTRIBUTE_STANDARD_IS_SYMLINK,
G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
cancellable, error);
if (!info)
goto out;
is_symlink = g_file_info_get_is_symlink (info);
if (is_symlink)
dirmon = g_file_monitor_file (app->root, 0, cancellable, error);
else
dirmon = g_file_monitor_directory (app->root, 0, cancellable, error);
if (!dirmon)
goto out;
g_signal_connect (dirmon, "changed", G_CALLBACK (on_dir_changed), app);
}
while (app->running)
g_main_context_iteration (NULL, TRUE);
ret = TRUE;
out:
g_clear_object (&app->root);
if (context)
g_option_context_free (context);
return ret;
}
|
