summaryrefslogtreecommitdiffstats
path: root/usbmuxd/main.c
diff options
context:
space:
mode:
Diffstat (limited to 'usbmuxd/main.c')
-rw-r--r--usbmuxd/main.c548
1 files changed, 0 insertions, 548 deletions
diff --git a/usbmuxd/main.c b/usbmuxd/main.c
deleted file mode 100644
index dde99c2..0000000
--- a/usbmuxd/main.c
+++ /dev/null
@@ -1,548 +0,0 @@
-/*
- usbmuxd - iPhone/iPod Touch USB multiplex server daemon
-
-Copyright (C) 2009 Hector Martin "marcan" <hector@marcansoft.com>
-
-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 or version 3.
-
-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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-
-*/
-
-#define _BSD_SOURCE
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <signal.h>
-#include <unistd.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <getopt.h>
-#include <pwd.h>
-#include <grp.h>
-
-#include "log.h"
-#include "usb.h"
-#include "device.h"
-#include "client.h"
-
-static const char *socket_path = "/var/run/usbmuxd";
-static const char *lockfile = "/var/run/usbmuxd.pid";
-
-int should_exit;
-
-static int verbose = 0;
-static int foreground = 0;
-static int drop_privileges = 0;
-static const char *drop_user = "usbmux";
-static int opt_udev = 0;
-static int opt_exit = 0;
-static int exit_signal = 0;
-static int daemon_pipe;
-
-static int report_to_parent = 0;
-
-int create_socket(void) {
- struct sockaddr_un bind_addr;
- int listenfd;
-
- if(unlink(socket_path) == -1 && errno != ENOENT) {
- usbmuxd_log(LL_FATAL, "unlink(%s) failed: %s", socket_path, strerror(errno));
- return -1;
- }
-
- listenfd = socket(AF_UNIX, SOCK_STREAM, 0);
- if (listenfd == -1) {
- usbmuxd_log(LL_FATAL, "socket() failed: %s", strerror(errno));
- return -1;
- }
-
- bzero(&bind_addr, sizeof(bind_addr));
- bind_addr.sun_family = AF_UNIX;
- strcpy(bind_addr.sun_path, socket_path);
- if (bind(listenfd, (struct sockaddr*)&bind_addr, sizeof(bind_addr)) != 0) {
- usbmuxd_log(LL_FATAL, "bind() failed: %s", strerror(errno));
- return -1;
- }
-
- // Start listening
- if (listen(listenfd, 5) != 0) {
- usbmuxd_log(LL_FATAL, "listen() failed: %s", strerror(errno));
- return -1;
- }
-
- chmod(socket_path, 0666);
-
- return listenfd;
-}
-
-void handle_signal(int sig)
-{
- if (sig != SIGUSR1) {
- usbmuxd_log(LL_NOTICE,"Caught signal %d, exiting", sig);
- should_exit = 1;
- } else {
- if(opt_udev) {
- usbmuxd_log(LL_INFO, "Caught SIGUSR1, checking if we can terminate (no more devices attached)...");
- if (device_get_count() > 0) {
- // we can't quit, there are still devices attached.
- usbmuxd_log(LL_NOTICE, "Refusing to terminate, there are still devices attached. Kill me with signal 15 (TERM) to force quit.");
- } else {
- // it's safe to quit
- should_exit = 1;
- }
- } else {
- usbmuxd_log(LL_INFO, "Caught SIGUSR1 but we weren't started in --udev mode, ignoring");
- }
- }
-}
-
-void set_signal_handlers(void)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(struct sigaction));
- sa.sa_handler = handle_signal;
- sigaction(SIGINT, &sa, NULL);
- sigaction(SIGQUIT, &sa, NULL);
- sigaction(SIGTERM, &sa, NULL);
- sigaction(SIGUSR1, &sa, NULL);
-}
-
-int main_loop(int listenfd)
-{
- int to, cnt, i, dto;
- struct fdlist pollfds;
-
- while(!should_exit) {
- usbmuxd_log(LL_FLOOD, "main_loop iteration");
- to = usb_get_timeout();
- usbmuxd_log(LL_FLOOD, "USB timeout is %d ms", to);
- dto = device_get_timeout();
- usbmuxd_log(LL_FLOOD, "Device timeout is %d ms", to);
- if(dto < to)
- to = dto;
-
- fdlist_create(&pollfds);
- fdlist_add(&pollfds, FD_LISTEN, listenfd, POLLIN);
- usb_get_fds(&pollfds);
- client_get_fds(&pollfds);
- usbmuxd_log(LL_FLOOD, "fd count is %d", pollfds.count);
-
- cnt = poll(pollfds.fds, pollfds.count, to);
- usbmuxd_log(LL_FLOOD, "poll() returned %d", cnt);
-
- if(cnt == -1) {
- if(errno == EINTR && should_exit) {
- usbmuxd_log(LL_INFO, "event processing interrupted");
- fdlist_free(&pollfds);
- return 0;
- }
- } else if(cnt == 0) {
- if(usb_process() < 0) {
- usbmuxd_log(LL_FATAL, "usb_process() failed");
- fdlist_free(&pollfds);
- return -1;
- }
- device_check_timeouts();
- } else {
- int done_usb = 0;
- for(i=0; i<pollfds.count; i++) {
- if(pollfds.fds[i].revents) {
- if(!done_usb && pollfds.owners[i] == FD_USB) {
- if(usb_process() < 0) {
- usbmuxd_log(LL_FATAL, "usb_process() failed");
- fdlist_free(&pollfds);
- return -1;
- }
- done_usb = 1;
- }
- if(pollfds.owners[i] == FD_LISTEN) {
- if(client_accept(listenfd) < 0) {
- usbmuxd_log(LL_FATAL, "client_accept() failed");
- fdlist_free(&pollfds);
- return -1;
- }
- }
- if(pollfds.owners[i] == FD_CLIENT) {
- client_process(pollfds.fds[i].fd, pollfds.fds[i].revents);
- }
- }
- }
- }
- fdlist_free(&pollfds);
- }
- return 0;
-}
-
-/**
- * make this program run detached from the current console
- */
-static int daemonize(void)
-{
- pid_t pid;
- pid_t sid;
- int pfd[2];
- int res;
-
- // already a daemon
- if (getppid() == 1)
- return 0;
-
- if((res = pipe(pfd)) < 0) {
- usbmuxd_log(LL_FATAL, "pipe() failed.");
- return res;
- }
-
- pid = fork();
- if (pid < 0) {
- usbmuxd_log(LL_FATAL, "fork() failed.");
- return pid;
- }
-
- if (pid > 0) {
- // exit parent process
- int status;
- close(pfd[1]);
-
- if((res = read(pfd[0],&status,sizeof(int))) != sizeof(int)) {
- fprintf(stderr, "usbmuxd: ERROR: Failed to get init status from child, check syslog for messages.\n");
- exit(1);
- }
- if(status != 0)
- fprintf(stderr, "usbmuxd: ERROR: Child process exited with error %d, check syslog for messages.\n", status);
- exit(status);
- }
- // At this point we are executing as the child process
- // but we need to do one more fork
-
- daemon_pipe = pfd[1];
- close(pfd[0]);
- report_to_parent = 1;
-
- // Change the file mode mask
- umask(0);
-
- // Create a new SID for the child process
- sid = setsid();
- if (sid < 0) {
- usbmuxd_log(LL_FATAL, "setsid() failed.");
- return -1;
- }
-
- pid = fork();
- if (pid < 0) {
- usbmuxd_log(LL_FATAL, "fork() failed (second).");
- return pid;
- }
-
- if (pid > 0) {
- // exit parent process
- close(daemon_pipe);
- exit(0);
- }
-
- // Change the current working directory.
- if ((chdir("/")) < 0) {
- usbmuxd_log(LL_FATAL, "chdir() failed");
- return -2;
- }
- // Redirect standard files to /dev/null
- if (!freopen("/dev/null", "r", stdin)) {
- usbmuxd_log(LL_FATAL, "Redirection of stdin failed.");
- return -3;
- }
- if (!freopen("/dev/null", "w", stdout)) {
- usbmuxd_log(LL_FATAL, "Redirection of stdout failed.");
- return -3;
- }
-
- return 0;
-}
-
-static int notify_parent(int status)
-{
- int res;
-
- report_to_parent = 0;
- if ((res = write(daemon_pipe, &status, sizeof(int))) != sizeof(int)) {
- usbmuxd_log(LL_FATAL, "Could not notify parent!");
- if(res >= 0)
- return -2;
- else
- return res;
- }
- close(daemon_pipe);
- if (!freopen("/dev/null", "w", stderr)) {
- usbmuxd_log(LL_FATAL, "Redirection of stderr failed.");
- return -1;
- }
- return 0;
-}
-
-static void usage()
-{
- printf("usage: usbmuxd [options]\n");
- printf("\t-h|--help Print this message.\n");
- printf("\t-v|--verbose Be verbose (use twice or more to increase).\n");
- printf("\t-f|--foreground Do not daemonize (implies one -v).\n");
- printf("\t-U|--user[=USER] Change to this user after startup (needs usb privileges).\n");
- printf("\t If USER is not specified, defaults to usbmux.\n");
- printf("\t-u|--udev Run in udev operation mode.\n");
- printf("\t-x|--exit Tell a running instance to exit if there are no devices\n");
- printf("\t connected (must be in udev mode).\n");
- printf("\t-X|--force-exit Tell a running instance to exit, even if there are still\n");
- printf("\t devices connected (always works).\n");
- printf("\n");
-}
-
-static void parse_opts(int argc, char **argv)
-{
- static struct option longopts[] = {
- {"help", 0, NULL, 'h'},
- {"foreground", 0, NULL, 'f'},
- {"verbose", 0, NULL, 'v'},
- {"user", 2, NULL, 'U'},
- {"udev", 0, NULL, 'u'},
- {"exit", 0, NULL, 'x'},
- {"force-exit", 0, NULL, 'X'},
- {NULL, 0, NULL, 0}
- };
- int c;
-
- while (1) {
- c = getopt_long(argc, argv, "hfvuU::xX", longopts, (int *) 0);
- if (c == -1) {
- break;
- }
-
- switch (c) {
- case 'h':
- usage();
- exit(0);
- case 'f':
- foreground = 1;
- break;
- case 'v':
- ++verbose;
- break;
- case 'U':
- drop_privileges = 1;
- if(optarg)
- drop_user = optarg;
- break;
- case 'u':
- opt_udev = 1;
- break;
- case 'x':
- opt_exit = 1;
- exit_signal = SIGUSR1;
- break;
- case 'X':
- opt_exit = 1;
- exit_signal = SIGTERM;
- break;
- default:
- usage();
- exit(2);
- }
- }
-}
-
-int main(int argc, char *argv[])
-{
- int listenfd;
- int res = 0;
- int lfd;
- struct flock lock;
- char pids[10];
-
- parse_opts(argc, argv);
-
- argc -= optind;
- argv += optind;
-
- if (!foreground) {
- verbose += LL_WARNING;
- log_enable_syslog();
- } else {
- verbose += LL_NOTICE;
- }
-
- /* set log level to specified verbosity */
- log_level = verbose;
-
- usbmuxd_log(LL_NOTICE, "usbmux v0.1 starting up");
- should_exit = 0;
-
- set_signal_handlers();
-
- res = lfd = open(lockfile, O_WRONLY|O_CREAT, 0644);
- if(res == -1) {
- usbmuxd_log(LL_FATAL, "Could not open lockfile");
- goto terminate;
- }
- lock.l_type = F_WRLCK;
- lock.l_whence = SEEK_SET;
- lock.l_start = 0;
- lock.l_len = 0;
- fcntl(lfd, F_GETLK, &lock);
- close(lfd);
- if (lock.l_type != F_UNLCK) {
- if (opt_exit) {
- if (lock.l_pid && !kill(lock.l_pid, 0)) {
- usbmuxd_log(LL_NOTICE, "Sending signal %d to instance with pid %d", exit_signal, lock.l_pid);
- res = 0;
- if (kill(lock.l_pid, exit_signal) < 0) {
- usbmuxd_log(LL_FATAL, "Could not deliver signal %d to pid %d", exit_signal, lock.l_pid);
- res = -1;
- }
- goto terminate;
- } else {
- usbmuxd_log(LL_ERROR, "Could not determine pid of the other running instance!");
- res = -1;
- goto terminate;
- }
- } else {
- if (!opt_udev) {
- usbmuxd_log(LL_ERROR, "Another instance is already running (pid %d). exiting.", lock.l_pid);
- res = -1;
- } else {
- usbmuxd_log(LL_NOTICE, "Another instance is already running (pid %d). exiting.", lock.l_pid);
- res = 0;
- }
- goto terminate;
- }
- }
- unlink(lockfile);
-
- if (opt_exit) {
- usbmuxd_log(LL_NOTICE, "No running instance found, none killed. exiting.");
- goto terminate;
- }
-
- if (!foreground) {
- if ((res = daemonize()) < 0) {
- fprintf(stderr, "usbmuxd: FATAL: Could not daemonize!\n");
- usbmuxd_log(LL_FATAL, "Could not daemonize!");
- goto terminate;
- }
- }
-
- // now open the lockfile and place the lock
- res = lfd = open(lockfile, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL, 0644);
- if(res < 0) {
- usbmuxd_log(LL_FATAL, "Could not open lockfile");
- goto terminate;
- }
- lock.l_type = F_WRLCK;
- lock.l_whence = SEEK_SET;
- lock.l_start = 0;
- lock.l_len = 0;
- if ((res = fcntl(lfd, F_SETLK, &lock)) < 0) {
- usbmuxd_log(LL_FATAL, "Lockfile locking failed!");
- goto terminate;
- }
- sprintf(pids, "%d", getpid());
- if ((res = write(lfd, pids, strlen(pids))) != strlen(pids)) {
- usbmuxd_log(LL_FATAL, "Could not write pidfile!");
- if(res >= 0)
- res = -2;
- goto terminate;
- }
-
- usbmuxd_log(LL_INFO, "Creating socket");
- res = listenfd = create_socket();
- if(listenfd < 0)
- goto terminate;
-
- // drop elevated privileges
- if (drop_privileges && (getuid() == 0 || geteuid() == 0)) {
- struct passwd *pw = getpwnam(drop_user);
- if (!pw) {
- usbmuxd_log(LL_FATAL, "Dropping privileges failed, check if user '%s' exists!", drop_user);
- res = -1;
- goto terminate;
- }
-
- if ((res = initgroups(drop_user, pw->pw_gid)) < 0) {
- usbmuxd_log(LL_FATAL, "Failed to drop privileges (cannot set supplementary groups)");
- goto terminate;
- }
- if ((res = setgid(pw->pw_gid)) < 0) {
- usbmuxd_log(LL_FATAL, "Failed to drop privileges (cannot set group ID to %d)", pw->pw_gid);
- goto terminate;
- }
- if ((res = setuid(pw->pw_uid)) < 0) {
- usbmuxd_log(LL_FATAL, "Failed to drop privileges (cannot set user ID to %d)", pw->pw_uid);
- goto terminate;
- }
-
- // security check
- if (setuid(0) != -1) {
- usbmuxd_log(LL_FATAL, "Failed to drop privileges properly!");
- res = -1;
- goto terminate;
- }
- if (getuid() != pw->pw_uid || getgid() != pw->pw_gid) {
- usbmuxd_log(LL_FATAL, "Failed to drop privileges properly!");
- res = -1;
- goto terminate;
- }
- usbmuxd_log(LL_NOTICE, "Successfully dropped privileges to '%s'", drop_user);
- }
-
- client_init();
- device_init();
- usbmuxd_log(LL_INFO, "Initializing USB");
- if((res = usb_init()) < 0)
- goto terminate;
-
- usbmuxd_log(LL_INFO, "%d device%s detected", res, (res==1)?"":"s");
-
- usbmuxd_log(LL_NOTICE, "Initialization complete");
-
- if (report_to_parent)
- if((res = notify_parent(0)) < 0)
- goto terminate;
-
- res = main_loop(listenfd);
- if(res < 0)
- usbmuxd_log(LL_FATAL, "main_loop failed");
-
- usbmuxd_log(LL_NOTICE, "usbmux shutting down");
- device_kill_connections();
- usb_shutdown();
- device_shutdown();
- client_shutdown();
- usbmuxd_log(LL_NOTICE, "Shutdown complete");
-
-terminate:
- log_disable_syslog();
-
- if (res < 0)
- res = -res;
- else
- res = 0;
- if (report_to_parent)
- notify_parent(res);
-
- return res;
-}
© 2009-2020 libimobiledevice.org - All rights reserved - Generated by cgit - Icons from Tango - Uses Google Analytics