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/*
* socket.c - this file is part of Geany, a fast and lightweight IDE
*
* Copyright 2006-2012 Enrico Trรถger <enrico(dot)troeger(at)uvena(dot)de>
* Copyright 2006-2012 Nick Treleaven <nick(dot)treleaven(at)btinternet(dot)com>
* Copyright 2006 Hiroyuki Yamamoto (author of Sylpheed)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Socket setup and messages handling.
* The socket allows detection and messages to be sent to the first running instance of Geany.
* Only the first instance loads session files at startup, and opens files from the command-line.
*/
/*
* Little dev doc:
* Each command which is sent between two instances (see send_open_command and
* socket_lock_input_cb) should have the following scheme:
* command name\n
* data\n
* data\n
* ...
* .\n
* The first thing should be the command name followed by the data belonging to the command and
* to mark the end of data send a single '.'. Each message should be ended with \n.
* The command window is only available on Windows and takes no additional data, instead it
* writes back a Windows handle (HWND) for the main window to set it to the foreground (focus).
*
* At the moment the commands window, doclist, open, openro, line and column are available.
*
* About the socket files on Unix-like systems:
* Geany creates a socket in /tmp (or any other directory returned by g_get_tmp_dir()) and
* a symlink in the current configuration to the created socket file. The symlink is named
* geany_socket_<hostname>_<displayname> (displayname is the name of the active X display).
* If the socket file cannot be created in the temporary directory, Geany creates the socket file
* directly in the configuration directory as a fallback.
*
*/
#include "geany.h"
#ifdef HAVE_SOCKET
#ifndef G_OS_WIN32
# include <sys/time.h>
# include <sys/types.h>
# include <sys/socket.h>
# include <sys/un.h>
# include <netinet/in.h>
# include <glib/gstdio.h>
#else
# include <gdk/gdkwin32.h>
# include <windows.h>
# include <winsock2.h>
# include <ws2tcpip.h>
#endif
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif
#include "main.h"
#include "socket.h"
#include "document.h"
#include "support.h"
#include "ui_utils.h"
#include "utils.h"
#include "dialogs.h"
#include "encodings.h"
#include "project.h"
#ifdef G_OS_WIN32
#define REMOTE_CMD_PORT 49876
#define SOCKET_IS_VALID(s) ((s) != INVALID_SOCKET)
#else
#define SOCKET_IS_VALID(s) ((s) >= 0)
#define INVALID_SOCKET (-1)
#endif
#define BUFFER_LENGTH 4096
struct socket_info_struct socket_info;
#ifdef G_OS_WIN32
static gint socket_fd_connect_inet (gushort port);
static gint socket_fd_open_inet (gushort port);
static void socket_init_win32 (void);
#else
static gint socket_fd_connect_unix (const gchar *path);
static gint socket_fd_open_unix (const gchar *path);
#endif
static gint socket_fd_write (gint sock, const gchar *buf, gint len);
static gint socket_fd_write_all (gint sock, const gchar *buf, gint len);
static gint socket_fd_gets (gint sock, gchar *buf, gint len);
static gint socket_fd_check_io (gint fd, GIOCondition cond);
static gint socket_fd_read (gint sock, gchar *buf, gint len);
static gint socket_fd_recv (gint fd, gchar *buf, gint len, gint flags);
static gint socket_fd_close (gint sock);
static void send_open_command(gint sock, gint argc, gchar **argv)
{
gint i;
gchar *filename;
g_return_if_fail(argc > 1);
geany_debug("using running instance of Geany");
if (cl_options.goto_line >= 0)
{
gchar *line = g_strdup_printf("%d\n", cl_options.goto_line);
socket_fd_write_all(sock, "line\n", 5);
socket_fd_write_all(sock, line, strlen(line));
socket_fd_write_all(sock, ".\n", 2);
g_free(line);
}
if (cl_options.goto_column >= 0)
{
gchar *col = g_strdup_printf("%d\n", cl_options.goto_column);
socket_fd_write_all(sock, "column\n", 7);
socket_fd_write_all(sock, col, strlen(col));
socket_fd_write_all(sock, ".\n", 2);
g_free(col);
}
if (cl_options.readonly) /* append "ro" to denote readonly status for new docs */
socket_fd_write_all(sock, "openro\n", 7);
else
socket_fd_write_all(sock, "open\n", 5);
for (i = 1; i < argc && argv[i] != NULL; i++)
{
filename = main_get_argv_filename(argv[i]);
/* if the filename is valid or if a new file should be opened is check on the other side */
if (filename != NULL)
{
socket_fd_write_all(sock, filename, strlen(filename));
socket_fd_write_all(sock, "\n", 1);
}
else
{
g_printerr(_("Could not find file '%s'."), filename);
g_printerr("\n"); /* keep translation from open_cl_files() in main.c. */
}
g_free(filename);
}
socket_fd_write_all(sock, ".\n", 2);
}
#ifndef G_OS_WIN32
static void remove_socket_link_full(void)
{
gchar real_path[512];
gsize len;
real_path[0] = '\0';
/* read the contents of the symbolic link socket_info.file_name and delete it
* readlink should return something like "/tmp/geany_socket.499602d2" */
len = readlink(socket_info.file_name, real_path, sizeof(real_path) - 1);
if ((gint) len > 0)
{
real_path[len] = '\0';
g_unlink(real_path);
}
g_unlink(socket_info.file_name);
}
#endif
static void socket_get_document_list(gint sock)
{
gchar doc_list[BUFFER_LENGTH];
gint doc_list_len;
if (sock < 0)
return;
socket_fd_write_all(sock, "doclist\n", 8);
doc_list_len = socket_fd_read(sock, doc_list, sizeof(doc_list));
if (doc_list_len >= BUFFER_LENGTH)
doc_list_len = BUFFER_LENGTH -1;
doc_list[doc_list_len] = '\0';
/* if we received ETX (end-of-text), there were no open files, so print only otherwise */
if (! utils_str_equal(doc_list, "\3"))
printf("%s", doc_list);
}
#ifndef G_OS_WIN32
static void check_socket_permissions(void)
{
struct stat socket_stat;
if (g_lstat(socket_info.file_name, &socket_stat) == 0)
{ /* If the user id of the process is not the same as the owner of the socket
* file, then ignore this socket and start a new session. */
if (socket_stat.st_uid != getuid())
{
const gchar *msg = _(
/* TODO maybe this message needs a rewording */
"Geany tried to access the Unix Domain socket of another instance running as another user.\n"
"This is a fatal error and Geany will now quit.");
g_warning("%s", msg);
dialogs_show_msgbox(GTK_MESSAGE_ERROR, "%s", msg);
exit(1);
}
}
}
#endif
/* (Unix domain) socket support to replace the old FIFO code
* (taken from Sylpheed, thanks)
* Returns the created socket, -1 if an error occurred or -2 if another socket exists and files
* were sent to it. */
gint socket_init(gint argc, gchar **argv)
{
gint sock;
#ifdef G_OS_WIN32
HANDLE hmutex;
HWND hwnd;
socket_init_win32();
hmutex = CreateMutexA(NULL, FALSE, "Geany");
if (! hmutex)
{
geany_debug("cannot create Mutex\n");
return -1;
}
if (GetLastError() != ERROR_ALREADY_EXISTS)
{
/* To support multiple instances with different configuration directories (as we do on
* non-Windows systems) we would need to use different port number s but it might be
* difficult to get a port number which is unique for a configuration directory (path)
* and which is unused. This port number has to be guessed by the first and new instance
* and the only data is the configuration directory path.
* For now we use one port number, that is we support only one instance at all. */
sock = socket_fd_open_inet(REMOTE_CMD_PORT);
if (sock < 0)
return 0;
return sock;
}
sock = socket_fd_connect_inet(REMOTE_CMD_PORT);
if (sock < 0)
return -1;
#else
gchar *display_name = gdk_get_display();
gchar *hostname = utils_get_hostname();
gchar *p;
if (display_name == NULL)
display_name = g_strdup("NODISPLAY");
/* these lines are taken from dcopc.c in kdelibs */
if ((p = strrchr(display_name, '.')) > strrchr(display_name, ':') && p != NULL)
*p = '\0';
/* remove characters that may not be acceptable in a filename */
for (p = display_name; *p; p++)
{
if (*p == ':' || *p == '/')
*p = '_';
}
if (socket_info.file_name == NULL)
socket_info.file_name = g_strdup_printf("%s%cgeany_socket_%s_%s",
app->configdir, G_DIR_SEPARATOR, hostname, display_name);
g_free(display_name);
g_free(hostname);
/* check whether the real user id is the same as this of the socket file */
check_socket_permissions();
sock = socket_fd_connect_unix(socket_info.file_name);
if (sock < 0)
{
remove_socket_link_full(); /* deletes the socket file and the symlink */
return socket_fd_open_unix(socket_info.file_name);
}
#endif
/* remote command mode, here we have another running instance and want to use it */
#ifdef G_OS_WIN32
/* first we send a request to retrieve the window handle and focus the window */
socket_fd_write_all(sock, "window\n", 7);
if (socket_fd_read(sock, (gchar *)&hwnd, sizeof(hwnd)) == sizeof(hwnd))
SetForegroundWindow(hwnd);
#endif
/* now we send the command line args */
if (argc > 1)
{
send_open_command(sock, argc, argv);
}
if (cl_options.list_documents)
{
socket_get_document_list(sock);
}
socket_fd_close(sock);
return -2;
}
gint socket_finalize(void)
{
if (socket_info.lock_socket < 0)
return -1;
if (socket_info.lock_socket_tag > 0)
g_source_remove(socket_info.lock_socket_tag);
if (socket_info.read_ioc)
{
g_io_channel_shutdown(socket_info.read_ioc, FALSE, NULL);
g_io_channel_unref(socket_info.read_ioc);
socket_info.read_ioc = NULL;
}
#ifdef G_OS_WIN32
WSACleanup();
#else
if (socket_info.file_name != NULL)
{
remove_socket_link_full(); /* deletes the socket file and the symlink */
g_free(socket_info.file_name);
}
#endif
return 0;
}
#ifdef G_OS_UNIX
static gint socket_fd_connect_unix(const gchar *path)
{
gint sock;
struct sockaddr_un addr;
sock = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
{
perror("fd_connect_unix(): socket");
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
{
socket_fd_close(sock);
return -1;
}
return sock;
}
static gint socket_fd_open_unix(const gchar *path)
{
gint sock;
struct sockaddr_un addr;
gint val;
gchar *real_path;
sock = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0)
{
perror("sock_open_unix(): socket");
return -1;
}
val = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0)
{
perror("setsockopt");
socket_fd_close(sock);
return -1;
}
/* fix for #1888561:
* in case the configuration directory is located on a network file system or any other
* file system which doesn't support sockets, we just link the socket there and create the
* real socket in the system's tmp directory assuming it supports sockets */
real_path = g_strdup_printf("%s%cgeany_socket.%08x",
g_get_tmp_dir(), G_DIR_SEPARATOR, g_random_int());
if (utils_is_file_writable(real_path) != 0)
{ /* if real_path is not writable for us, fall back to ~/.config/geany/geany_socket_*_* */
/* instead of creating a symlink and print a warning */
g_warning("Socket %s could not be written, using %s as fallback.", real_path, path);
SETPTR(real_path, g_strdup(path));
}
/* create a symlink in e.g. ~/.config/geany/geany_socket_hostname__0 to /tmp/geany_socket.499602d2 */
else if (symlink(real_path, path) != 0)
{
perror("symlink");
socket_fd_close(sock);
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, real_path, sizeof(addr.sun_path) - 1);
if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
{
perror("bind");
socket_fd_close(sock);
return -1;
}
if (listen(sock, 1) < 0)
{
perror("listen");
socket_fd_close(sock);
return -1;
}
g_chmod(real_path, 0600);
g_free(real_path);
return sock;
}
#endif
static gint socket_fd_close(gint fd)
{
#ifdef G_OS_WIN32
return closesocket(fd);
#else
return close(fd);
#endif
}
#ifdef G_OS_WIN32
static gint socket_fd_open_inet(gushort port)
{
SOCKET sock;
struct sockaddr_in addr;
gchar val;
sock = socket(AF_INET, SOCK_STREAM, 0);
if (G_UNLIKELY(! SOCKET_IS_VALID(sock)))
{
geany_debug("fd_open_inet(): socket() failed: %d\n", WSAGetLastError());
return -1;
}
val = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0)
{
perror("setsockopt");
socket_fd_close(sock);
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (bind(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
{
perror("bind");
socket_fd_close(sock);
return -1;
}
if (listen(sock, 1) < 0)
{
perror("listen");
socket_fd_close(sock);
return -1;
}
return sock;
}
static gint socket_fd_connect_inet(gushort port)
{
SOCKET sock;
struct sockaddr_in addr;
sock = socket(AF_INET, SOCK_STREAM, 0);
if (G_UNLIKELY(! SOCKET_IS_VALID(sock)))
{
geany_debug("fd_connect_inet(): socket() failed: %d\n", WSAGetLastError());
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
{
socket_fd_close(sock);
return -1;
}
return sock;
}
static void socket_init_win32(void)
{
WSADATA wsadata;
if (WSAStartup(MAKEWORD(2, 2), &wsadata) != NO_ERROR)
geany_debug("WSAStartup() failed\n");
return;
}
#endif
static void handle_input_filename(const gchar *buf)
{
gchar *utf8_filename, *locale_filename;
/* we never know how the input is encoded, so do the best auto detection we can */
if (! g_utf8_validate(buf, -1, NULL))
utf8_filename = encodings_convert_to_utf8(buf, -1, NULL);
else
utf8_filename = g_strdup(buf);
locale_filename = utils_get_locale_from_utf8(utf8_filename);
if (locale_filename)
{
if (g_str_has_suffix(locale_filename, ".geany"))
{
if (project_ask_close())
main_load_project_from_command_line(locale_filename, TRUE);
}
else
main_handle_filename(locale_filename);
}
g_free(utf8_filename);
g_free(locale_filename);
}
static gchar *build_document_list(void)
{
GString *doc_list = g_string_new(NULL);
guint i;
const gchar *filename;
foreach_document(i)
{
filename = DOC_FILENAME(documents[i]);
g_string_append(doc_list, filename);
g_string_append_c(doc_list, '\n');
}
return g_string_free(doc_list, FALSE);
}
gboolean socket_lock_input_cb(GIOChannel *source, GIOCondition condition, gpointer data)
{
gint fd, sock;
gchar buf[BUFFER_LENGTH];
struct sockaddr_in caddr;
socklen_t caddr_len = sizeof(caddr);
GtkWidget *window = data;
gboolean popup = FALSE;
fd = g_io_channel_unix_get_fd(source);
sock = accept(fd, (struct sockaddr *)&caddr, &caddr_len);
/* first get the command */
while (socket_fd_gets(sock, buf, sizeof(buf)) != -1)
{
if (strncmp(buf, "open", 4) == 0)
{
cl_options.readonly = strncmp(buf+4, "ro", 2) == 0; /* open in readonly? */
while (socket_fd_gets(sock, buf, sizeof(buf)) != -1 && *buf != '.')
{
gsize buf_len = strlen(buf);
/* remove trailing newline */
if (buf_len > 0 && buf[buf_len - 1] == '\n')
buf[buf_len - 1] = '\0';
handle_input_filename(buf);
}
popup = TRUE;
}
else if (strncmp(buf, "doclist", 7) == 0)
{
gchar *doc_list = build_document_list();
if (!EMPTY(doc_list))
socket_fd_write_all(sock, doc_list, strlen(doc_list));
else
/* send ETX (end-of-text) in case we have no open files, we must send anything
* otherwise the client would hang on reading */
socket_fd_write_all(sock, "\3", 1);
g_free(doc_list);
}
else if (strncmp(buf, "line", 4) == 0)
{
while (socket_fd_gets(sock, buf, sizeof(buf)) != -1 && *buf != '.')
{
g_strstrip(buf); /* remove \n char */
/* on any error we get 0 which should be safe enough as fallback */
cl_options.goto_line = atoi(buf);
}
}
else if (strncmp(buf, "column", 6) == 0)
{
while (socket_fd_gets(sock, buf, sizeof(buf)) != -1 && *buf != '.')
{
g_strstrip(buf); /* remove \n char */
/* on any error we get 0 which should be safe enough as fallback */
cl_options.goto_column = atoi(buf);
}
}
#ifdef G_OS_WIN32
else if (strncmp(buf, "window", 6) == 0)
{
# if GTK_CHECK_VERSION(3, 0, 0)
HWND hwnd = (HWND) gdk_win32_window_get_handle(gtk_widget_get_window(window));
# else
HWND hwnd = (HWND) gdk_win32_drawable_get_handle(
GDK_DRAWABLE(gtk_widget_get_window(window)));
# endif
socket_fd_write(sock, (gchar *)&hwnd, sizeof(hwnd));
}
#endif
}
if (popup)
{
#ifdef GDK_WINDOWING_X11
GdkWindow *x11_window = gtk_widget_get_window(window);
/* Set the proper interaction time on the window. This seems necessary to make
* gtk_window_present() really bring the main window into the foreground on some
* window managers like Gnome's metacity.
* Code taken from Gedit. */
# if GTK_CHECK_VERSION(3, 0, 0)
if (GDK_IS_X11_WINDOW(x11_window))
# endif
{
gdk_x11_window_set_user_time(x11_window, gdk_x11_get_server_time(x11_window));
}
#endif
gtk_window_present(GTK_WINDOW(window));
#ifdef G_OS_WIN32
gdk_window_show(gtk_widget_get_window(window));
#endif
}
socket_fd_close(sock);
return TRUE;
}
static gint socket_fd_gets(gint fd, gchar *buf, gint len)
{
gchar *newline, *bp = buf;
gint n;
if (--len < 1)
return -1;
do
{
if ((n = socket_fd_recv(fd, bp, len, MSG_PEEK)) <= 0)
return -1;
if ((newline = memchr(bp, '\n', n)) != NULL)
n = newline - bp + 1;
if ((n = socket_fd_read(fd, bp, n)) < 0)
return -1;
bp += n;
len -= n;
} while (! newline && len);
*bp = '\0';
return bp - buf;
}
static gint socket_fd_recv(gint fd, gchar *buf, gint len, gint flags)
{
if (socket_fd_check_io(fd, G_IO_IN) < 0)
return -1;
return recv(fd, buf, len, flags);
}
static gint socket_fd_read(gint fd, gchar *buf, gint len)
{
if (socket_fd_check_io(fd, G_IO_IN) < 0)
return -1;
#ifdef G_OS_WIN32
return recv(fd, buf, len, 0);
#else
return read(fd, buf, len);
#endif
}
static gint socket_fd_check_io(gint fd, GIOCondition cond)
{
struct timeval timeout;
fd_set fds;
#ifdef G_OS_UNIX
gint flags;
#endif
timeout.tv_sec = 60;
timeout.tv_usec = 0;
#ifdef G_OS_UNIX
/* checking for non-blocking mode */
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0)
{
perror("fcntl");
return 0;
}
if ((flags & O_NONBLOCK) != 0)
return 0;
#endif
FD_ZERO(&fds);
#ifdef G_OS_WIN32
FD_SET((SOCKET)fd, &fds);
#else
FD_SET(fd, &fds);
#endif
if (cond == G_IO_IN)
{
select(fd + 1, &fds, NULL, NULL, &timeout);
}
else
{
select(fd + 1, NULL, &fds, NULL, &timeout);
}
if (FD_ISSET(fd, &fds))
{
return 0;
}
else
{
geany_debug("Socket IO timeout");
return -1;
}
}
static gint socket_fd_write_all(gint fd, const gchar *buf, gint len)
{
gint n, wrlen = 0;
while (len)
{
n = socket_fd_write(fd, buf, len);
if (n <= 0)
return -1;
len -= n;
wrlen += n;
buf += n;
}
return wrlen;
}
gint socket_fd_write(gint fd, const gchar *buf, gint len)
{
if (socket_fd_check_io(fd, G_IO_OUT) < 0)
return -1;
#ifdef G_OS_WIN32
return send(fd, buf, len, 0);
#else
return write(fd, buf, len);
#endif
}
#endif

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