/*
* launcher.c -- functions for launching web browsers for browser-switchboard
*
- * Copyright (C) 2009 Steven Luo
+ * Copyright (C) 2009-2010 Steven Luo
* Derived from a Python implementation by Jason Simpson and Steven Luo
*
* This program is free software; you can redistribute it and/or
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
+#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
+#include <sys/stat.h>
+#include <fcntl.h>
#include <dbus/dbus-glib.h>
+#ifdef FREMANTLE
+#include <dbus/dbus.h>
+#include <signal.h>
+#include <sys/ptrace.h>
+#include <sys/inotify.h>
+
+#define DEFAULT_HOMEDIR "/home/user"
+#define MICROB_PROFILE_DIR "/.mozilla/microb"
+#define MICROB_LOCKFILE "lock"
+#endif
+
#include "browser-switchboard.h"
#include "launcher.h"
#include "dbus-server-bindings.h"
+#include "log.h"
+
+#define LAUNCH_DEFAULT_BROWSER launch_microb
+
+#ifdef FREMANTLE
+static int microb_started = 0;
+
+/* Check to see whether MicroB is ready to handle D-Bus requests yet
+ See the comments in launch_microb to understand how this works. */
+static DBusHandlerResult check_microb_started(DBusConnection *connection,
+ DBusMessage *message,
+ void *user_data) {
+ DBusError error;
+ char *name, *old, *new;
+
+ log_msg("Checking to see if MicroB is ready\n");
+ dbus_error_init(&error);
+ if (!dbus_message_get_args(message, &error,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_STRING, &old,
+ DBUS_TYPE_STRING, &new,
+ DBUS_TYPE_INVALID)) {
+ log_msg("%s\n", error.message);
+ dbus_error_free(&error);
+ return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+ }
+ /* If old is an empty string, then the name has been acquired, and
+ MicroB should be ready to handle our request */
+ if (strlen(old) == 0) {
+ log_msg("MicroB ready\n");
+ microb_started = 1;
+ }
+
+ return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+}
+
+/* Get a browserd PID from the corresponding Mozilla profile lockfile */
+static pid_t get_browserd_pid(const char *lockfile) {
+ char buf[256], *tmp;
+
+ /* The lockfile is a symlink pointing to "[ipaddr]:+[pid]", so read in
+ the target of the symlink and parse it that way */
+ memset(buf, '\0', 256);
+ if (readlink(lockfile, buf, 255) == -1)
+ return -errno;
+ if (!(tmp = strstr(buf, ":+")))
+ return 0;
+ tmp += 2; /* Skip over the ":+" */
-#define DEFAULT_BROWSER "/usr/bin/tear"
-#define LAUNCH_DEFAULT_BROWSER launch_tear
+ return atoi(tmp);
+}
+#endif
+
+/* Close stdin/stdout/stderr and replace with /dev/null */
+static int close_stdio(void) {
+ int fd;
+
+ if ((fd = open("/dev/null", O_RDWR)) == -1)
+ return -1;
+
+ if (dup2(fd, 0) == -1 || dup2(fd, 1) == -1 || dup2(fd, 2) == -1)
+ return -1;
+
+ close(fd);
+ return 0;
+}
static void launch_tear(struct swb_context *ctx, char *uri) {
int status;
if (!uri)
uri = "new_window";
- printf("launch_tear with uri '%s'\n", uri);
+ log_msg("launch_tear with uri '%s'\n", uri);
+ /* We should be able to just call the D-Bus service to open Tear ...
+ but if Tear's not open, that cuases D-Bus to start Tear and then
+ pass it the OpenAddress call, which results in two browser windows.
+ Properly fixing this probably requires Tear to provide a D-Bus
+ method that opens an address in an existing window, but for now work
+ around by just invoking Tear with exec() if it's not running. */
status = system("pidof tear > /dev/null");
if (WIFEXITED(status) && !WEXITSTATUS(status)) {
- if (!tear_proxy)
- tear_proxy = dbus_g_proxy_new_for_name(ctx->session_bus,
- "com.nokia.tear", "/com/nokia/tear",
- "com.nokia.Tear");
- dbus_g_proxy_call(tear_proxy, "OpenAddress", &error,
- G_TYPE_STRING, uri, G_TYPE_INVALID);
+ if (!tear_proxy) {
+ if (!(tear_proxy = dbus_g_proxy_new_for_name(
+ ctx->session_bus,
+ "com.nokia.tear",
+ "/com/nokia/tear",
+ "com.nokia.Tear"))) {
+ log_msg("Failed to create proxy for com.nokia.Tear D-Bus interface\n");
+ exit(1);
+ }
+ }
+
+ if (!dbus_g_proxy_call(tear_proxy, "OpenAddress", &error,
+ G_TYPE_STRING, uri, G_TYPE_INVALID,
+ G_TYPE_INVALID)) {
+ log_msg("Opening window failed: %s\n", error->message);
+ exit(1);
+ }
if (!ctx->continuous_mode)
exit(0);
} else {
if (ctx->continuous_mode) {
if ((pid = fork()) != 0) {
/* Parent process or error in fork() */
- printf("child: %d\n", (int)pid);
+ log_msg("child: %d\n", (int)pid);
return;
}
/* Child process */
setsid();
+ close_stdio();
}
execl("/usr/bin/tear", "/usr/bin/tear", uri, (char *)NULL);
}
int kill_browserd = 0;
int status;
pid_t pid;
+#ifdef FREMANTLE
+ char *homedir, *microb_profile_dir, *microb_lockfile;
+ size_t len;
+ int fd, inot_wd;
+ DBusConnection *raw_connection;
+ DBusError dbus_error;
+ DBusHandleMessageFunction filter_func;
+ DBusGProxy *g_proxy;
+ GError *gerror = NULL;
+ int bytes_read;
+ char buf[256], *pos;
+ struct inotify_event *event;
+ pid_t browserd_pid, waited_pid;
+ struct sigaction act, oldact;
+ int ignore_sigstop;
+#endif
if (!uri)
uri = "new_window";
- status = system("pidof /usr/sbin/browserd > /dev/null");
+ log_msg("launch_microb with uri '%s'\n", uri);
+
+ /* Launch browserd if it's not running */
+ status = system("pidof browserd > /dev/null");
if (WIFEXITED(status) && WEXITSTATUS(status)) {
kill_browserd = 1;
- system("/usr/sbin/browserd -d");
+#ifdef FREMANTLE
+ system("/usr/sbin/browserd -d -b > /dev/null 2>&1");
+#else
+ system("/usr/sbin/browserd -d > /dev/null 2>&1");
+#endif
}
+ /* Release the osso_browser D-Bus name so that MicroB can take it */
dbus_release_osso_browser_name(ctx);
+#ifdef FREMANTLE
+ /* Put together the path to the MicroB browserd lockfile */
+ if (!(homedir = getenv("HOME")))
+ homedir = DEFAULT_HOMEDIR;
+ len = strlen(homedir) + strlen(MICROB_PROFILE_DIR) + 1;
+ if (!(microb_profile_dir = calloc(len, sizeof(char)))) {
+ log_msg("calloc() failed\n");
+ exit(1);
+ }
+ snprintf(microb_profile_dir, len, "%s%s",
+ homedir, MICROB_PROFILE_DIR);
+ len = strlen(homedir) + strlen(MICROB_PROFILE_DIR) +
+ strlen("/") + strlen(MICROB_LOCKFILE) + 1;
+ if (!(microb_lockfile = calloc(len, sizeof(char)))) {
+ log_msg("calloc() failed\n");
+ exit(1);
+ }
+ snprintf(microb_lockfile, len, "%s%s/%s",
+ homedir, MICROB_PROFILE_DIR, MICROB_LOCKFILE);
+
+ /* Watch for the creation of a MicroB browserd lockfile
+ NB: The watch has to be set up here, before the browser
+ is launched, to make sure there's no race between browserd
+ starting and us creating the watch */
+ if ((fd = inotify_init()) == -1) {
+ log_perror(errno, "inotify_init");
+ exit(1);
+ }
+ if ((inot_wd = inotify_add_watch(fd, microb_profile_dir,
+ IN_CREATE)) == -1) {
+ log_perror(errno, "inotify_add_watch");
+ exit(1);
+ }
+ free(microb_profile_dir);
+
+ /* Set up the D-Bus eavesdropping we'll use to watch for MicroB
+ acquiring the com.nokia.osso_browser D-Bus name. Again, this needs
+ to happen before the browser is launched, so that there's no race
+ between establishing the watch and browser startup.
+
+ Ideas for how to do this monitoring derived from the dbus-monitor
+ code (tools/dbus-monitor.c in the D-Bus codebase). */
+ dbus_error_init(&dbus_error);
+
+ raw_connection = dbus_bus_get_private(DBUS_BUS_SESSION, &dbus_error);
+ if (!raw_connection) {
+ log_msg("Failed to open connection to session bus: %s\n",
+ dbus_error.message);
+ dbus_error_free(&dbus_error);
+ exit(1);
+ }
+
+ dbus_bus_add_match(raw_connection,
+ "type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='com.nokia.osso_browser'",
+ &dbus_error);
+ if (dbus_error_is_set(&dbus_error)) {
+ log_msg("Failed to set up watch for browser UI start: %s\n",
+ dbus_error.message);
+ dbus_error_free(&dbus_error);
+ exit(1);
+ }
+ filter_func = check_microb_started;
+ if (!dbus_connection_add_filter(raw_connection,
+ filter_func, NULL, NULL)) {
+ log_msg("Failed to set up watch filter!\n");
+ exit(1);
+ }
+
if ((pid = fork()) == -1) {
- perror("fork");
+ log_perror(errno, "fork");
exit(1);
}
+
if (pid > 0) {
/* Parent process */
+ /* Wait for our child to start the browser UI process and
+ for it to acquire the com.nokia.osso_browser D-Bus name,
+ then make the appropriate method call to open the browser
+ window. */
+ microb_started = 0;
+ log_msg("Waiting for MicroB to start\n");
+ while (!microb_started &&
+ dbus_connection_read_write_dispatch(raw_connection,
+ -1));
+ dbus_connection_remove_filter(raw_connection,
+ filter_func, NULL);
+ dbus_bus_remove_match(raw_connection,
+ "type='signal',interface='org.freedesktop.DBus',member='NameOwnerChanged',arg0='com.nokia.osso_browser'",
+ &dbus_error);
+ if (dbus_error_is_set(&dbus_error))
+ /* Don't really care -- about to disconnect from the
+ bus anyhow */
+ dbus_error_free(&dbus_error);
+ dbus_connection_close(raw_connection);
+ dbus_connection_unref(raw_connection);
+
+ /* Browser UI's started, send it the request for a new window
+ via D-Bus */
+ g_proxy = dbus_g_proxy_new_for_name(ctx->session_bus,
+ "com.nokia.osso_browser",
+ "/com/nokia/osso_browser/request",
+ "com.nokia.osso_browser");
+ if (!g_proxy) {
+ log_msg("Couldn't get a com.nokia.osso_browser proxy\n");
+ exit(1);
+ }
+ if (!strcmp(uri, "new_window")) {
+#if 0 /* Since we can't detect when the bookmark window closes, we'd have a
+ corner case where, if the user just closes the bookmark window
+ without opening any browser windows, we don't kill off MicroB or
+ resume handling com.nokia.osso_browser */
+ if (!dbus_g_proxy_call(g_proxy, "top_application",
+ &gerror, G_TYPE_INVALID,
+ G_TYPE_INVALID)) {
+ log_msg("Opening window failed: %s\n",
+ gerror->message);
+ exit(1);
+ }
+#endif
+ if (!dbus_g_proxy_call(g_proxy, "load_url",
+ &gerror,
+ G_TYPE_STRING, "about:blank",
+ G_TYPE_INVALID,
+ G_TYPE_INVALID)) {
+ log_msg("Opening window failed: %s\n",
+ gerror->message);
+ exit(1);
+ }
+ } else {
+ if (!dbus_g_proxy_call(g_proxy, "load_url",
+ &gerror,
+ G_TYPE_STRING, uri,
+ G_TYPE_INVALID,
+ G_TYPE_INVALID)) {
+ log_msg("Opening window failed: %s\n",
+ gerror->message);
+ exit(1);
+ }
+ }
+ g_object_unref(g_proxy);
+
+ /* Workaround: the browser process we started is going to want
+ to hang around forever, hogging the com.nokia.osso_browser
+ D-Bus interface while at it. To fix this, we notice that
+ when the last browser window closes, the browser UI restarts
+ its attached browserd process. Get the browserd process's
+ PID and use ptrace() to watch for process termination.
+
+ This has the problem of not being able to detect whether
+ the bookmark window is open and/or in use, but it's the best
+ that I can think of. Better suggestions would be greatly
+ appreciated. */
+
+ /* Wait for the MicroB browserd lockfile to be created */
+ log_msg("Waiting for browserd lockfile to be created\n");
+ memset(buf, '\0', 256);
+ /* read() blocks until there are events to be read */
+ while ((bytes_read = read(fd, buf, 255)) > 0) {
+ pos = buf;
+ /* Loop until we see the event we're looking for
+ or until all the events are processed */
+ while (pos && (pos-buf) < bytes_read) {
+ event = (struct inotify_event *)pos;
+ len = sizeof(struct inotify_event)
+ + event->len;
+ if (!strcmp(MICROB_LOCKFILE,
+ event->name)) {
+ /* Lockfile created */
+ pos = NULL;
+ break;
+ } else if ((pos-buf) + len < bytes_read)
+ /* More events to process */
+ pos += len;
+ else
+ /* All events processed */
+ break;
+ }
+ if (!pos)
+ /* Event found, stop looking */
+ break;
+ memset(buf, '\0', 256);
+ }
+ inotify_rm_watch(fd, inot_wd);
+ close(fd);
+
+ /* Get the PID of the browserd from the lockfile */
+ if ((browserd_pid = get_browserd_pid(microb_lockfile)) <= 0) {
+ if (browserd_pid == 0)
+ log_msg("Profile lockfile link lacks PID\n");
+ else
+ log_perror(-browserd_pid,
+ "readlink() on lockfile failed");
+ exit(1);
+ }
+ free(microb_lockfile);
+
+ /* Wait for the browserd to close */
+ log_msg("Waiting for MicroB (browserd pid %d) to finish\n",
+ browserd_pid);
+ /* Clear any existing SIGCHLD handler to prevent interference
+ with our wait() */
+ act.sa_handler = SIG_DFL;
+ act.sa_flags = 0;
+ sigemptyset(&(act.sa_mask));
+ if (sigaction(SIGCHLD, &act, &oldact) == -1) {
+ log_perror(errno, "clearing SIGCHLD handler failed");
+ exit(1);
+ }
+
+ /* Trace the browserd to get a close notification */
+ ignore_sigstop = 1;
+ if (ptrace(PTRACE_ATTACH, browserd_pid, NULL, NULL) == -1) {
+ log_perror(errno, "PTRACE_ATTACH");
+ exit(1);
+ }
+ ptrace(PTRACE_CONT, browserd_pid, NULL, NULL);
+ while ((waited_pid = wait(&status)) > 0) {
+ if (waited_pid != browserd_pid)
+ /* Not interested in other processes */
+ continue;
+ if (WIFEXITED(status) || WIFSIGNALED(status))
+ /* browserd exited */
+ break;
+ else if (WIFSTOPPED(status)) {
+ /* browserd was sent a signal
+ We're responsible for making sure this
+ signal gets delivered */
+ if (ignore_sigstop &&
+ WSTOPSIG(status) == SIGSTOP) {
+ /* Ignore the first SIGSTOP received
+ This is raised for some reason
+ immediately after we start tracing
+ the process, and won't be followed
+ by a SIGCONT at any point */
+ log_msg("Ignoring first SIGSTOP\n");
+ ptrace(PTRACE_CONT, browserd_pid,
+ NULL, NULL);
+ ignore_sigstop = 0;
+ continue;
+ }
+ log_msg("Forwarding signal %d to browserd\n",
+ WSTOPSIG(status));
+ ptrace(PTRACE_CONT, browserd_pid,
+ NULL, WSTOPSIG(status));
+ }
+ }
+
+ /* Kill off browser UI
+ XXX: There is a race here with the restarting of the closed
+ browserd; if that happens before we kill the browser UI, the
+ newly started browserd may not close with the UI
+ XXX: Hope we don't cause data loss here! */
+ log_msg("Killing MicroB\n");
+ kill(pid, SIGTERM);
waitpid(pid, &status, 0);
+
+ /* Restore old SIGCHLD handler */
+ if (sigaction(SIGCHLD, &oldact, NULL) == -1) {
+ log_perror(errno,
+ "restoring old SIGCHLD handler failed");
+ exit(1);
+ }
} else {
/* Child process */
+ dbus_connection_close(raw_connection);
+ dbus_connection_unref(raw_connection);
+ close(fd);
+ close_stdio();
+
+ /* exec maemo-invoker directly instead of relying on the
+ /usr/bin/browser symlink, since /usr/bin/browser may have
+ been replaced with a shell script calling us via D-Bus */
+ /* Launch the browser in the background -- our parent will
+ wait for it to claim the D-Bus name and then display the
+ window using D-Bus */
+ execl("/usr/bin/maemo-invoker", "browser", (char *)NULL);
+ }
+#else /* !FREMANTLE */
+ if ((pid = fork()) == -1) {
+ log_perror(errno, "fork");
+ exit(1);
+ }
+
+ if (pid > 0) {
+ /* Parent process */
+ waitpid(pid, &status, 0);
+ } else {
+ /* Child process */
+ close_stdio();
+
+ /* exec maemo-invoker directly instead of relying on the
+ /usr/bin/browser symlink, since /usr/bin/browser may have
+ been replaced with a shell script calling us via D-Bus */
if (!strcmp(uri, "new_window")) {
execl("/usr/bin/maemo-invoker",
"browser", (char *)NULL);
"browser", "--url", uri, (char *)NULL);
}
}
+#endif /* FREMANTLE */
+ /* Kill off browserd if we started it */
if (kill_browserd)
- system("kill `pidof /usr/sbin/browserd`");
+ system("kill `pidof browserd`");
if (!ctx || !ctx->continuous_mode)
exit(0);
if (!uri || !strcmp(uri, "new_window"))
uri = "";
- urilen = strlen(uri);
- if (urilen > 0) {
- /* Quote the URI */
+
+ log_msg("launch_other_browser with uri '%s'\n", uri);
+
+ if ((urilen = strlen(uri)) > 0) {
+ /* Quote the URI to prevent the shell from interpreting it */
/* urilen+3 = length of URI + 2x \' + \0 */
if (!(quoted_uri = calloc(urilen+3, sizeof(char))))
exit(1);
if (!(command = calloc(cmdlen+urilen+1, sizeof(char))))
exit(1);
snprintf(command, cmdlen+urilen+1, ctx->other_browser_cmd, quoted_uri);
- printf("command: '%s'\n", command);
+ log_msg("command: '%s'\n", command);
if (ctx->continuous_mode) {
if (fork() != 0) {
}
/* Child process */
setsid();
+ close_stdio();
}
execl("/bin/sh", "/bin/sh", "-c", command, (char *)NULL);
}
+/* Use launch_other_browser as the default browser launcher, with the string
+ passed in as the other_browser_cmd
+ Resulting other_browser_cmd is always safe to free(), even if a pointer
+ to a string constant is passed in */
static void use_other_browser_cmd(struct swb_context *ctx, char *cmd) {
size_t len = strlen(cmd);
free(ctx->other_browser_cmd);
ctx->other_browser_cmd = calloc(len+1, sizeof(char));
if (!ctx->other_browser_cmd) {
- printf("malloc failed!\n");
+ log_msg("malloc failed!\n");
ctx->default_browser_launcher = LAUNCH_DEFAULT_BROWSER;
} else {
ctx->other_browser_cmd = strncpy(ctx->other_browser_cmd,
return;
if (!default_browser) {
- /* No default_browser configured -- use DEFAULT_BROWSER if
- installed, otherwise launch MicroB */
- if (!access(DEFAULT_BROWSER, X_OK))
- ctx->default_browser_launcher = LAUNCH_DEFAULT_BROWSER;
- else
- ctx->default_browser_launcher = launch_microb;
+ /* No default_browser configured -- use built-in default */
+ ctx->default_browser_launcher = LAUNCH_DEFAULT_BROWSER;
return;
}
else if (!strcmp(default_browser, "microb"))
ctx->default_browser_launcher = launch_microb;
else if (!strcmp(default_browser, "fennec"))
+ /* Cheat and reuse launch_other_browser, since we don't appear
+ to need to do anything special */
use_other_browser_cmd(ctx, "fennec %s");
else if (!strcmp(default_browser, "midori"))
use_other_browser_cmd(ctx, "midori %s");
if (ctx->other_browser_cmd)
ctx->default_browser_launcher = launch_other_browser;
else {
- printf("default_browser is 'other', but no other_browser_cmd set -- using default\n");
+ log_msg("default_browser is 'other', but no other_browser_cmd set -- using default\n");
ctx->default_browser_launcher = LAUNCH_DEFAULT_BROWSER;
}
} else {
- printf("Unknown default_browser %s, using default", default_browser);
+ log_msg("Unknown default_browser %s, using default",
+ default_browser);
ctx->default_browser_launcher = LAUNCH_DEFAULT_BROWSER;
}
}
projects / browser-switch / blobdiff