X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udevd.c;h=e227a64d71de32ee82a29f85ed6def978e33709f;hp=53c7bf3df1bd0055b46c24d1caaeb02f042f57f3;hb=129979643f5ae0363cef23978bce5d546be2f77d;hpb=085cce379a4256cd039ccda3c8198aba058c8720 diff --git a/udevd.c b/udevd.c index 53c7bf3df..e227a64d7 100644 --- a/udevd.c +++ b/udevd.c @@ -1,7 +1,7 @@ /* - * udevd.c - hotplug event serializer + * udevd.c - event listener and serializer * - * Copyright (C) 2004 Kay Sievers + * Copyright (C) 2004-2005 Kay Sievers * Copyright (C) 2004 Chris Friesen * * @@ -21,7 +21,6 @@ */ #include -#include #include #include #include @@ -31,14 +30,20 @@ #include #include #include +#include +#include +#include #include #include #include #include #include #include +#include +#include #include "list.h" +#include "udev_libc_wrapper.h" #include "udev.h" #include "udev_version.h" #include "udev_utils.h" @@ -46,88 +51,99 @@ #include "logging.h" /* global variables*/ -static int udevsendsock; +static int udevd_sock; +static int uevent_netlink_sock; static pid_t sid; -static int pipefds[2]; -static long startup_time; -static unsigned long long expected_seqnum = 0; +static int signal_pipe[2] = {-1, -1}; static volatile int sigchilds_waiting; static volatile int run_msg_q; -static volatile int sig_flag; +static volatile int udev_exit; +static int init_phase = 1; static int run_exec_q; +static int stop_exec_q; +static char *udev_bin; +static int event_timeout; +static int max_childs; +static int max_childs_running; +static unsigned long long expected_seqnum; +static char log[32]; static LIST_HEAD(msg_list); static LIST_HEAD(exec_list); static LIST_HEAD(running_list); -static void exec_queue_manager(void); -static void msg_queue_manager(void); -static void user_sighandler(void); -static void reap_sigchilds(void); -char *udev_bin; -#ifdef LOG -void log_message (int level, const char *format, ...) +#ifdef USE_LOG +void log_message (int priority, const char *format, ...) { - va_list args; + va_list args; + + if (priority > udev_log_priority) + return; va_start(args, format); - vsyslog(level, format, args); + vsyslog(priority, format, args); va_end(args); } #endif -#define msg_dump(msg) \ - dbg("msg_dump: sequence %llu, '%s', '%s', '%s'", \ - msg->seqnum, msg->action, msg->devpath, msg->subsystem); - static void msg_dump_queue(void) { #ifdef DEBUG - struct hotplug_msg *msg; + struct uevent_msg *msg; - list_for_each_entry(msg, &msg_list, list) + list_for_each_entry(msg, &msg_list, node) dbg("sequence %llu in queue", msg->seqnum); #endif } -static void run_queue_delete(struct hotplug_msg *msg) +static void msg_queue_delete(struct uevent_msg *msg) { - list_del(&msg->list); + list_del(&msg->node); free(msg); } /* orders the message in the queue by sequence number */ -static void msg_queue_insert(struct hotplug_msg *msg) +static void msg_queue_insert(struct uevent_msg *msg) { - struct hotplug_msg *loop_msg; + struct uevent_msg *loop_msg; struct sysinfo info; if (msg->seqnum == 0) { dbg("no SEQNUM, move straight to the exec queue"); - list_add(&msg->list, &exec_list); + list_add_tail(&msg->node, &exec_list); run_exec_q = 1; return; } + /* store timestamp of queuing */ + sysinfo(&info); + msg->queue_time = info.uptime; + + /* with the first event we provide a phase of shorter timeout */ + if (init_phase) { + static long init_time; + + if (init_time == 0) + init_time = info.uptime; + if (info.uptime - init_time >= UDEVD_INIT_TIME) + init_phase = 0; + } + /* sort message by sequence number into list */ - list_for_each_entry_reverse(loop_msg, &msg_list, list) { + list_for_each_entry_reverse(loop_msg, &msg_list, node) { if (loop_msg->seqnum < msg->seqnum) break; if (loop_msg->seqnum == msg->seqnum) { dbg("ignoring duplicate message seq %llu", msg->seqnum); + free(msg); return; } } - - /* store timestamp of queuing */ - sysinfo(&info); - msg->queue_time = info.uptime; - - list_add(&msg->list, &loop_msg->list); - dbg("queued message seq %llu", msg->seqnum); + list_add(&msg->node, &loop_msg->node); + info("seq %llu queued, '%s' '%s'", msg->seqnum, msg->action, msg->devpath); /* run msg queue manager */ run_msg_q = 1; @@ -136,30 +152,33 @@ static void msg_queue_insert(struct hotplug_msg *msg) } /* forks event and removes event from run queue when finished */ -static void udev_run(struct hotplug_msg *msg) +static void udev_event_run(struct uevent_msg *msg) { char *const argv[] = { "udev", msg->subsystem, NULL }; pid_t pid; + struct sysinfo info; pid = fork(); switch (pid) { case 0: /* child */ - close(udevsendsock); + if (uevent_netlink_sock != -1) + close(uevent_netlink_sock); + close(udevd_sock); logging_close(); - setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY); execve(udev_bin, argv, msg->envp); - dbg("exec of child failed"); + err("exec of child failed"); _exit(1); - break; case -1: - dbg("fork of child failed"); - run_queue_delete(msg); + err("fork of child failed"); + msg_queue_delete(msg); break; default: /* get SIGCHLD in main loop */ - dbg("==> exec seq %llu [%d] working at '%s'", msg->seqnum, pid, msg->devpath); + sysinfo(&info); + info("seq %llu forked, pid [%d], '%s' '%s', %ld seconds old", + msg->seqnum, pid, msg->action, msg->subsystem, info.uptime - msg->queue_time); msg->pid = pid; } } @@ -176,7 +195,7 @@ static int running_processes(void) if (f == -1) return -1; - len = read(f, buf, sizeof(buf)); + len = read(f, buf, sizeof(buf)-1); close(f); if (len <= 0) @@ -225,7 +244,7 @@ static int running_processes_in_session(pid_t session, int limit) if (f == -1) continue; - len = read(f, line, sizeof(line)); + len = read(f, line, sizeof(line)-1); close(f); if (len <= 0) @@ -262,7 +281,7 @@ static int compare_devpath(const char *running, const char *waiting) { int i; - for (i = 0; i < DEVPATH_SIZE; i++) { + for (i = 0; i < PATH_SIZE; i++) { /* identical device event found */ if (running[i] == '\0' && waiting[i] == '\0') return 1; @@ -284,71 +303,86 @@ static int compare_devpath(const char *running, const char *waiting) } /* returns still running task for the same device, its parent or its physical device */ -static struct hotplug_msg *running_with_devpath(struct hotplug_msg *msg) +static int running_with_devpath(struct uevent_msg *msg, int limit) { - struct hotplug_msg *loop_msg; + struct uevent_msg *loop_msg; + int childs_count = 0; if (msg->devpath == NULL) - return NULL; + return 0; - list_for_each_entry(loop_msg, &running_list, list) { + /* skip any events with a timeout set */ + if (msg->timeout != 0) + return 0; + + list_for_each_entry(loop_msg, &running_list, node) { + if (limit && childs_count++ > limit) { + dbg("%llu, maximum number (%i) of child reached", msg->seqnum, childs_count); + return 1; + } if (loop_msg->devpath == NULL) continue; /* return running parent/child device event */ - if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) - return loop_msg; + if (compare_devpath(loop_msg->devpath, msg->devpath) != 0) { + dbg("%llu, child device event still running %llu (%s)", + msg->seqnum, loop_msg->seqnum, loop_msg->devpath); + return 2; + } /* return running physical device event */ if (msg->physdevpath && msg->action && strcmp(msg->action, "add") == 0) - if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) - return loop_msg; + if (compare_devpath(loop_msg->devpath, msg->physdevpath) != 0) { + dbg("%llu, physical device event still running %llu (%s)", + msg->seqnum, loop_msg->seqnum, loop_msg->devpath); + return 3; + } } - return NULL; + return 0; } /* exec queue management routine executes the events and serializes events in the same sequence */ static void exec_queue_manager(void) { - struct hotplug_msg *loop_msg; - struct hotplug_msg *tmp_msg; - struct hotplug_msg *msg; + struct uevent_msg *loop_msg; + struct uevent_msg *tmp_msg; int running; + if (list_empty(&exec_list)) + return; + running = running_processes(); dbg("%d processes runnning on system", running); if (running < 0) - running = THROTTLE_MAX_RUNNING_CHILDS; + running = max_childs_running; - list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, list) { + list_for_each_entry_safe(loop_msg, tmp_msg, &exec_list, node) { /* check running processes in our session and possibly throttle */ - if (running >= THROTTLE_MAX_RUNNING_CHILDS) { - running = running_processes_in_session(sid, THROTTLE_MAX_RUNNING_CHILDS+10); - dbg("%d processes running in session", running); - if (running >= THROTTLE_MAX_RUNNING_CHILDS) { - dbg("delay seq %llu, cause too many processes already running", loop_msg->seqnum); + if (running >= max_childs_running) { + running = running_processes_in_session(sid, max_childs_running+10); + dbg("at least %d processes running in session", running); + if (running >= max_childs_running) { + dbg("delay seq %llu, cause too many processes already running", + loop_msg->seqnum); return; } } - msg = running_with_devpath(loop_msg); - if (!msg) { + if (running_with_devpath(loop_msg, max_childs) == 0) { /* move event to run list */ - list_move_tail(&loop_msg->list, &running_list); - udev_run(loop_msg); + list_move_tail(&loop_msg->node, &running_list); + udev_event_run(loop_msg); running++; dbg("moved seq %llu to running list", loop_msg->seqnum); - } else { - dbg("delay seq %llu (%s), cause seq %llu (%s) is still running", - loop_msg->seqnum, loop_msg->devpath, msg->seqnum, msg->devpath); - } + } else + dbg("delay seq %llu (%s)", loop_msg->seqnum, loop_msg->devpath); } } -static void msg_move_exec(struct hotplug_msg *msg) +static void msg_move_exec(struct uevent_msg *msg) { - list_move_tail(&msg->list, &exec_list); + list_move_tail(&msg->node, &exec_list); run_exec_q = 1; expected_seqnum = msg->seqnum+1; dbg("moved seq %llu to exec, next expected is %llu", @@ -358,31 +392,29 @@ static void msg_move_exec(struct hotplug_msg *msg) /* msg queue management routine handles the timeouts and dispatches the events */ static void msg_queue_manager(void) { - struct hotplug_msg *loop_msg; - struct hotplug_msg *tmp_msg; + struct uevent_msg *loop_msg; + struct uevent_msg *tmp_msg; struct sysinfo info; long msg_age = 0; - static int timeout = EVENT_INIT_TIMEOUT_SEC; - static int init = 1; + int timeout = event_timeout; dbg("msg queue manager, next expected is %llu", expected_seqnum); recheck: - list_for_each_entry_safe(loop_msg, tmp_msg, &msg_list, list) { + sysinfo(&info); + list_for_each_entry_safe(loop_msg, tmp_msg, &msg_list, node) { /* move event with expected sequence to the exec list */ if (loop_msg->seqnum == expected_seqnum) { msg_move_exec(loop_msg); continue; } - /* see if we are in the initialization phase and wait for the very first events */ - if (init && (info.uptime - startup_time >= INIT_TIME_SEC)) { - init = 0; - timeout = EVENT_TIMEOUT_SEC; - dbg("initialization phase passed, set timeout to %i seconds", EVENT_TIMEOUT_SEC); + /* limit timeout during initialization phase */ + if (init_phase) { + timeout = UDEVD_INIT_EVENT_TIMEOUT; + dbg("initialization phase, limit timeout to %i seconds", UDEVD_INIT_EVENT_TIMEOUT); } /* move event with expired timeout to the exec list */ - sysinfo(&info); msg_age = info.uptime - loop_msg->queue_time; dbg("seq %llu is %li seconds old", loop_msg->seqnum, msg_age); if (msg_age >= timeout) { @@ -396,20 +428,69 @@ recheck: msg_dump_queue(); /* set timeout for remaining queued events */ - if (list_empty(&msg_list) == 0) { + if (!list_empty(&msg_list)) { struct itimerval itv = {{0, 0}, {timeout - msg_age, 0}}; - dbg("next event expires in %li seconds", timeout - msg_age); + info("next event expires in %li seconds", timeout - msg_age); setitimer(ITIMER_REAL, &itv, NULL); } } -/* receive the udevsend message and do some sanity checks */ -static struct hotplug_msg *get_udevsend_msg(void) +static struct uevent_msg *get_msg_from_envbuf(const char *buf, int buf_size) { - static struct udevsend_msg usend_msg; - struct hotplug_msg *msg; int bufpos; int i; + struct uevent_msg *msg; + int major = 0; + int minor = 0; + + msg = malloc(sizeof(struct uevent_msg) + buf_size); + if (msg == NULL) + return NULL; + memset(msg, 0x00, sizeof(struct uevent_msg) + buf_size); + + /* copy environment buffer and reconstruct envp */ + memcpy(msg->envbuf, buf, buf_size); + bufpos = 0; + for (i = 0; (bufpos < buf_size) && (i < UEVENT_NUM_ENVP-2); i++) { + int keylen; + char *key; + + key = &msg->envbuf[bufpos]; + keylen = strlen(key); + msg->envp[i] = key; + bufpos += keylen + 1; + dbg("add '%s' to msg.envp[%i]", msg->envp[i], i); + + /* remember some keys for further processing */ + if (strncmp(key, "ACTION=", 7) == 0) + msg->action = &key[7]; + else if (strncmp(key, "DEVPATH=", 8) == 0) + msg->devpath = &key[8]; + else if (strncmp(key, "SUBSYSTEM=", 10) == 0) + msg->subsystem = &key[10]; + else if (strncmp(key, "SEQNUM=", 7) == 0) + msg->seqnum = strtoull(&key[7], NULL, 10); + else if (strncmp(key, "PHYSDEVPATH=", 12) == 0) + msg->physdevpath = &key[12]; + else if (strncmp(key, "MAJOR=", 6) == 0) + major = strtoull(&key[6], NULL, 10); + else if (strncmp(key, "MINOR=", 6) == 0) + minor = strtoull(&key[6], NULL, 10); + else if (strncmp(key, "TIMEOUT=", 8) == 0) + msg->timeout = strtoull(&key[8], NULL, 10); + } + msg->devt = makedev(major, minor); + msg->envp[i++] = "UDEVD_EVENT=1"; + msg->envp[i] = NULL; + + return msg; +} + +/* receive the udevd message from userspace */ +static struct uevent_msg *get_udevd_msg(void) +{ + static struct udevd_msg usend_msg; + struct uevent_msg *msg; ssize_t size; struct msghdr smsg; struct cmsghdr *cmsg; @@ -417,10 +498,11 @@ static struct hotplug_msg *get_udevsend_msg(void) struct ucred *cred; char cred_msg[CMSG_SPACE(sizeof(struct ucred))]; int envbuf_size; + int *intval; - memset(&usend_msg, 0x00, sizeof(struct udevsend_msg)); + memset(&usend_msg, 0x00, sizeof(struct udevd_msg)); iov.iov_base = &usend_msg; - iov.iov_len = sizeof(struct udevsend_msg); + iov.iov_len = sizeof(struct udevd_msg); memset(&smsg, 0x00, sizeof(struct msghdr)); smsg.msg_iov = &iov; @@ -428,114 +510,155 @@ static struct hotplug_msg *get_udevsend_msg(void) smsg.msg_control = cred_msg; smsg.msg_controllen = sizeof(cred_msg); - size = recvmsg(udevsendsock, &smsg, 0); + size = recvmsg(udevd_sock, &smsg, 0); if (size < 0) { if (errno != EINTR) - dbg("unable to receive udevsend message"); + err("unable to receive udevd message"); return NULL; } cmsg = CMSG_FIRSTHDR(&smsg); cred = (struct ucred *) CMSG_DATA(cmsg); if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) { - dbg("no sender credentials received, message ignored"); + err("no sender credentials received, message ignored"); return NULL; } if (cred->uid != 0) { - dbg("sender uid=%i, message ignored", cred->uid); + err("sender uid=%i, message ignored", cred->uid); return NULL; } if (strncmp(usend_msg.magic, UDEV_MAGIC, sizeof(UDEV_MAGIC)) != 0 ) { - dbg("message magic '%s' doesn't match, ignore it", usend_msg.magic); + err("message magic '%s' doesn't match, ignore it", usend_msg.magic); return NULL; } - envbuf_size = size - offsetof(struct udevsend_msg, envbuf); - dbg("envbuf_size=%i", envbuf_size); - msg = malloc(sizeof(struct hotplug_msg) + envbuf_size); - if (msg == NULL) - return NULL; - - memset(msg, 0x00, sizeof(struct hotplug_msg) + envbuf_size); + switch (usend_msg.type) { + case UDEVD_UEVENT_UDEVSEND: + case UDEVD_UEVENT_INITSEND: + info("udevd event message received"); + envbuf_size = size - offsetof(struct udevd_msg, envbuf); + dbg("envbuf_size=%i", envbuf_size); + msg = get_msg_from_envbuf(usend_msg.envbuf, envbuf_size); + if (msg == NULL) + return NULL; + msg->type = usend_msg.type; + return msg; + case UDEVD_STOP_EXEC_QUEUE: + info("udevd message (STOP_EXEC_QUEUE) received"); + stop_exec_q = 1; + break; + case UDEVD_START_EXEC_QUEUE: + info("udevd message (START_EXEC_QUEUE) received"); + stop_exec_q = 0; + exec_queue_manager(); + break; + case UDEVD_SET_LOG_LEVEL: + intval = (int *) usend_msg.envbuf; + info("udevd message (SET_LOG_PRIORITY) received, udev_log_priority=%i", *intval); + udev_log_priority = *intval; + sprintf(log, "UDEV_LOG=%i", udev_log_priority); + putenv(log); + break; + case UDEVD_SET_MAX_CHILDS: + intval = (int *) usend_msg.envbuf; + info("udevd message (UDEVD_SET_MAX_CHILDS) received, max_childs=%i", *intval); + max_childs = *intval; + break; + default: + dbg("unknown message type"); + } + return NULL; +} - /* copy environment buffer and reconstruct envp */ - memcpy(msg->envbuf, usend_msg.envbuf, envbuf_size); - bufpos = 0; - for (i = 0; (bufpos < envbuf_size) && (i < HOTPLUG_NUM_ENVP-2); i++) { - int keylen; - char *key; +/* receive the kernel user event message and do some sanity checks */ +static struct uevent_msg *get_netlink_msg(void) +{ + struct uevent_msg *msg; + int bufpos; + ssize_t size; + static char buffer[UEVENT_BUFFER_SIZE + 512]; + char *pos; - key = &msg->envbuf[bufpos]; - keylen = strlen(key); - msg->envp[i] = key; - bufpos += keylen + 1; - dbg("add '%s' to msg.envp[%i]", msg->envp[i], i); + size = recv(uevent_netlink_sock, &buffer, sizeof(buffer), 0); + if (size < 0) { + if (errno != EINTR) + err("unable to receive udevd message"); + return NULL; + } - /* remember some keys for further processing */ - if (strncmp(key, "ACTION=", 7) == 0) - msg->action = &key[7]; + if ((size_t)size > sizeof(buffer)-1) + size = sizeof(buffer)-1; + buffer[size] = '\0'; + dbg("uevent_size=%zi", size); - if (strncmp(key, "DEVPATH=", 8) == 0) - msg->devpath = &key[8]; + /* start of event payload */ + bufpos = strlen(buffer)+1; + msg = get_msg_from_envbuf(&buffer[bufpos], size-bufpos); + if (msg == NULL) + return NULL; + msg->type = UDEVD_UEVENT_NETLINK; - if (strncmp(key, "SUBSYSTEM=", 10) == 0) - msg->subsystem = &key[10]; + /* validate message */ + pos = strchr(buffer, '@'); + if (pos == NULL) { + err("invalid uevent '%s'", buffer); + free(msg); + return NULL; + } + pos[0] = '\0'; - if (strncmp(key, "SEQNUM=", 7) == 0) - msg->seqnum = strtoull(&key[7], NULL, 10); + if (msg->action == NULL) { + err("no ACTION in payload found, skip event '%s'", buffer); + free(msg); + return NULL; + } - if (strncmp(key, "PHYSDEVPATH=", 12) == 0) - msg->physdevpath = &key[12]; + if (strcmp(msg->action, buffer) != 0) { + err("ACTION in payload does not match uevent, skip event '%s'", buffer); + free(msg); + return NULL; } - msg->envp[i++] = "UDEVD_EVENT=1"; - msg->envp[i] = NULL; return msg; } static void asmlinkage sig_handler(int signum) { - int rc; - switch (signum) { case SIGINT: case SIGTERM: - exit(20 + signum); + udev_exit = 1; break; case SIGALRM: /* set flag, then write to pipe if needed */ run_msg_q = 1; - goto do_write; break; case SIGCHLD: /* set flag, then write to pipe if needed */ sigchilds_waiting = 1; - goto do_write; break; } -do_write: - /* if pipe is empty, write to pipe to force select to return - * immediately when it gets called - */ - if (!sig_flag) { - rc = write(pipefds[1],&signum,sizeof(signum)); - if (rc >= 0) - sig_flag = 1; - } + /* write to pipe, which will wakeup select() in our mainloop */ + write(signal_pipe[WRITE_END], "", 1); } static void udev_done(int pid) { /* find msg associated with pid and delete it */ - struct hotplug_msg *msg; + struct uevent_msg *msg; + struct sysinfo info; - list_for_each_entry(msg, &running_list, list) { + list_for_each_entry(msg, &running_list, node) { if (msg->pid == pid) { - dbg("<== exec seq %llu came back", msg->seqnum); - run_queue_delete(msg); + sysinfo(&info); + if (msg->queue_time) + info("seq %llu, pid [%d] exit, %ld seconds old", msg->seqnum, msg->pid, info.uptime - msg->queue_time); + else + info("seq 0, pid [%d] exit", msg->pid); + msg_queue_delete(msg); /* we want to run the exec queue manager since there may * be events waiting with the devpath of the one that @@ -549,33 +672,20 @@ static void udev_done(int pid) static void reap_sigchilds(void) { - while(1) { - int pid = waitpid(-1, NULL, WNOHANG); - if ((pid == -1) || (pid == 0)) - break; - udev_done(pid); - } -} - -/* just read everything from the pipe and clear the flag, - * the flags was set in the signal handler - */ -static void user_sighandler(void) -{ - int sig; + pid_t pid; - while(1) { - int rc = read(pipefds[0], &sig, sizeof(sig)); - if (rc < 0) + while (1) { + pid = waitpid(-1, NULL, WNOHANG); + if (pid <= 0) break; - - sig_flag = 0; + udev_done(pid); } } -static int init_udevsend_socket(void) +static int init_udevd_socket(void) { struct sockaddr_un saddr; + const int buffersize = 1024 * 1024; socklen_t addrlen; const int feature_on = 1; int retval; @@ -586,46 +696,110 @@ static int init_udevsend_socket(void) strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH); addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1; - udevsendsock = socket(AF_LOCAL, SOCK_DGRAM, 0); - if (udevsendsock == -1) { - dbg("error getting socket, %s", strerror(errno)); + udevd_sock = socket(AF_LOCAL, SOCK_DGRAM, 0); + if (udevd_sock == -1) { + err("error getting socket, %s", strerror(errno)); return -1; } + /* set receive buffersize */ + setsockopt(udevd_sock, SOL_SOCKET, SO_RCVBUF, &buffersize, sizeof(buffersize)); + /* the bind takes care of ensuring only one copy running */ - retval = bind(udevsendsock, (struct sockaddr *) &saddr, addrlen); + retval = bind(udevd_sock, (struct sockaddr *) &saddr, addrlen); if (retval < 0) { - dbg("bind failed, %s", strerror(errno)); - close(udevsendsock); + err("bind failed, %s", strerror(errno)); + close(udevd_sock); return -1; } /* enable receiving of the sender credentials */ - setsockopt(udevsendsock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on)); + setsockopt(udevd_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on)); + + return 0; +} + +static int init_uevent_netlink_sock(void) +{ + struct sockaddr_nl snl; + const int buffersize = 1024 * 1024; + int retval; + + memset(&snl, 0x00, sizeof(struct sockaddr_nl)); + snl.nl_family = AF_NETLINK; + snl.nl_pid = getpid(); + snl.nl_groups = 0xffffffff; + + uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT); + if (uevent_netlink_sock == -1) { + err("error getting socket, %s", strerror(errno)); + return -1; + } + + /* set receive buffersize */ + setsockopt(uevent_netlink_sock, SOL_SOCKET, SO_RCVBUF, &buffersize, sizeof(buffersize)); + + retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl, + sizeof(struct sockaddr_nl)); + if (retval < 0) { + err("bind failed, %s", strerror(errno)); + close(uevent_netlink_sock); + uevent_netlink_sock = -1; + return -1; + } return 0; } int main(int argc, char *argv[], char *envp[]) { - struct sysinfo info; - int maxsockplus; int retval; - int fd; + int devnull; struct sigaction act; fd_set readfds; - const char *udevd_expected_seqnum; + const char *value; + int uevent_netlink_active = 0; + int daemonize = 0; + int i; + + /* set std fd's to /dev/null, if the kernel forks us, we don't have them at all */ + devnull = open("/dev/null", O_RDWR); + if (devnull >= 0) { + if (devnull != STDIN_FILENO) + dup2(devnull, STDIN_FILENO); + if (devnull != STDOUT_FILENO) + dup2(devnull, STDOUT_FILENO); + if (devnull != STDERR_FILENO) + dup2(devnull, STDERR_FILENO); + if (devnull > STDERR_FILENO) + close(devnull); + } logging_init("udevd"); + if (devnull < 0) + err("fatal, could not open /dev/null"); + + udev_init_config(); dbg("version %s", UDEV_VERSION); if (getuid() != 0) { - dbg("need to be root, exit"); + err("need to be root, exit"); goto exit; } - /* daemonize on request */ - if (argc == 2 && strcmp(argv[1], "-d") == 0) { + for (i = 1 ; i < argc; i++) { + char *arg = argv[i]; + if (strcmp(arg, "--daemon") == 0 || strcmp(arg, "-d") == 0) { + info("will daemonize"); + daemonize = 1; + } + if (strcmp(arg, "--stop-exec-queue") == 0) { + info("will not execute events until START_EXEC_QUEUE is received"); + stop_exec_q = 1; + } + } + + if (daemonize) { pid_t pid; pid = fork(); @@ -634,7 +808,7 @@ int main(int argc, char *argv[], char *envp[]) dbg("damonized fork running"); break; case -1: - dbg("fork of daemon failed"); + err("fork of daemon failed"); goto exit; default: logging_close(); @@ -646,110 +820,151 @@ int main(int argc, char *argv[], char *envp[]) sid = setsid(); dbg("our session is %d", sid); - /* make sure we don't lock any path */ chdir("/"); umask(umask(077) | 022); - /*set a reasonable scheduling priority for the daemon */ + /* set a reasonable scheduling priority for the daemon */ setpriority(PRIO_PROCESS, 0, UDEVD_PRIORITY); - /* Set fds to dev/null */ - fd = open( "/dev/null", O_RDWR ); - if (fd >= 0) { - dup2(fd, 0); - dup2(fd, 1); - dup2(fd, 2); - if (fd > 2) - close(fd); - } else - dbg("error opening /dev/null %s", strerror(errno)); - /* setup signal handler pipe */ - retval = pipe(pipefds); + retval = pipe(signal_pipe); if (retval < 0) { - dbg("error getting pipes: %s", strerror(errno)); + err("error getting pipes: %s", strerror(errno)); goto exit; } - - retval = fcntl(pipefds[0], F_SETFL, O_NONBLOCK); + retval = fcntl(signal_pipe[READ_END], F_SETFL, O_NONBLOCK); if (retval < 0) { - dbg("error fcntl on read pipe: %s", strerror(errno)); + err("error fcntl on read pipe: %s", strerror(errno)); goto exit; } - retval = fcntl(pipefds[0], F_SETFD, FD_CLOEXEC); + retval = fcntl(signal_pipe[READ_END], F_SETFD, FD_CLOEXEC); if (retval < 0) - dbg("error fcntl on read pipe: %s", strerror(errno)); - - retval = fcntl(pipefds[1], F_SETFL, O_NONBLOCK); + err("error fcntl on read pipe: %s", strerror(errno)); + retval = fcntl(signal_pipe[WRITE_END], F_SETFL, O_NONBLOCK); if (retval < 0) { - dbg("error fcntl on write pipe: %s", strerror(errno)); + err("error fcntl on write pipe: %s", strerror(errno)); goto exit; } - retval = fcntl(pipefds[1], F_SETFD, FD_CLOEXEC); + retval = fcntl(signal_pipe[WRITE_END], F_SETFD, FD_CLOEXEC); if (retval < 0) - dbg("error fcntl on write pipe: %s", strerror(errno)); + err("error fcntl on write pipe: %s", strerror(errno)); /* set signal handlers */ - act.sa_handler = (void (*) (int))sig_handler; + memset(&act, 0x00, sizeof(struct sigaction)); + act.sa_handler = (void (*)(int)) sig_handler; sigemptyset(&act.sa_mask); act.sa_flags = SA_RESTART; sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); sigaction(SIGALRM, &act, NULL); sigaction(SIGCHLD, &act, NULL); + sigaction(SIGHUP, &act, NULL); - if (init_udevsend_socket() < 0) { + if (init_udevd_socket() < 0) { if (errno == EADDRINUSE) dbg("another udevd running, exit"); else - dbg("error initialising udevsend socket: %s", strerror(errno)); + dbg("error initialising udevd socket: %s", strerror(errno)); goto exit; } - /* possible override of udev binary, used for testing */ + if (init_uevent_netlink_sock() < 0) + info("uevent socket not available"); + + /* override of forked udev binary, used for testing */ udev_bin = getenv("UDEV_BIN"); if (udev_bin != NULL) - dbg("udev binary is set to '%s'", udev_bin); + info("udev binary is set to '%s'", udev_bin); else udev_bin = UDEV_BIN; - /* possible init of expected_seqnum value */ - udevd_expected_seqnum = getenv("UDEVD_EXPECTED_SEQNUM"); - if (udevd_expected_seqnum != NULL) { - expected_seqnum = strtoull(udevd_expected_seqnum, NULL, 10); - dbg("initialize expected_seqnum to %llu", expected_seqnum); + /* init of expected_seqnum value */ + value = getenv("UDEVD_EXPECTED_SEQNUM"); + if (value) { + expected_seqnum = strtoull(value, NULL, 10); + info("initialize expected_seqnum to %llu", expected_seqnum); } - /* get current time to provide shorter timeout on startup */ - sysinfo(&info); - startup_time = info.uptime; + /* timeout to wait for missing events */ + value = getenv("UDEVD_EVENT_TIMEOUT"); + if (value) + event_timeout = strtoul(value, NULL, 10); + else + event_timeout = UDEVD_EVENT_TIMEOUT; + info("initialize event_timeout to %u", event_timeout); - FD_ZERO(&readfds); - FD_SET(udevsendsock, &readfds); - FD_SET(pipefds[0], &readfds); - maxsockplus = udevsendsock+1; - while (1) { - struct hotplug_msg *msg; + /* maximum limit of forked childs */ + value = getenv("UDEVD_MAX_CHILDS"); + if (value) + max_childs = strtoul(value, NULL, 10); + else + max_childs = UDEVD_MAX_CHILDS; + info("initialize max_childs to %u", max_childs); + + /* start to throttle forking if maximum number of _running_ childs is reached */ + value = getenv("UDEVD_MAX_CHILDS_RUNNING"); + if (value) + max_childs_running = strtoull(value, NULL, 10); + else + max_childs_running = UDEVD_MAX_CHILDS_RUNNING; + info("initialize max_childs_running to %u", max_childs_running); + + /* export log_priority , as called programs may want to follow that setting */ + sprintf(log, "UDEV_LOG=%i", udev_log_priority); + putenv(log); + + while (!udev_exit) { + struct uevent_msg *msg; + int fdcount; - fd_set workreadfds = readfds; - retval = select(maxsockplus, &workreadfds, NULL, NULL, NULL); + FD_ZERO(&readfds); + FD_SET(signal_pipe[READ_END], &readfds); + FD_SET(udevd_sock, &readfds); + if (uevent_netlink_sock > 0) + FD_SET(uevent_netlink_sock, &readfds); - if (retval < 0) { + fdcount = select(UDEV_MAX(udevd_sock, uevent_netlink_sock)+1, &readfds, NULL, NULL, NULL); + if (fdcount < 0) { if (errno != EINTR) dbg("error in select: %s", strerror(errno)); continue; } - if (FD_ISSET(udevsendsock, &workreadfds)) { - msg = get_udevsend_msg(); - if (msg) + /* get user socket message */ + if (FD_ISSET(udevd_sock, &readfds)) { + msg = get_udevd_msg(); + if (msg) { + /* discard kernel messages if netlink is active */ + if (uevent_netlink_active && msg->type == UDEVD_UEVENT_UDEVSEND && msg->seqnum != 0) { + info("skip uevent_helper message with SEQNUM, netlink is active"); + free(msg); + } else + msg_queue_insert(msg); + } + } + + /* get kernel netlink message */ + if ((uevent_netlink_sock > 0) && FD_ISSET(uevent_netlink_sock, &readfds)) { + msg = get_netlink_msg(); + if (msg) { msg_queue_insert(msg); + /* disable udevsend with first netlink message */ + if (!uevent_netlink_active) { + info("uevent_nl message received, disable udevsend messages"); + uevent_netlink_active = 1; + } + } } - if (FD_ISSET(pipefds[0], &workreadfds)) - user_sighandler(); + /* received a signal, clear our notification pipe */ + if (FD_ISSET(signal_pipe[READ_END], &readfds)) { + char buf[256]; + + read(signal_pipe[READ_END], &buf, sizeof(buf)); + } + /* forked child have returned */ if (sigchilds_waiting) { sigchilds_waiting = 0; reap_sigchilds(); @@ -768,11 +983,23 @@ int main(int argc, char *argv[], char *envp[]) } run_exec_q = 0; - exec_queue_manager(); + if (!stop_exec_q) + exec_queue_manager(); } } exit: + if (signal_pipe[READ_END] > 0) + close(signal_pipe[READ_END]); + if (signal_pipe[WRITE_END] > 0) + close(signal_pipe[WRITE_END]); + + if (udevd_sock > 0) + close(udevd_sock); + if (uevent_netlink_sock > 0) + close(uevent_netlink_sock); + logging_close(); - return 1; + + return 0; }