From 30ff6afe596eddafacf22b1a5b2d1a3d6254ea15 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 15:14:44 +0200 Subject: Adding upstream version 2.36.1. Signed-off-by: Daniel Baumann --- misc-utils/uuidd.c | 714 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 714 insertions(+) create mode 100644 misc-utils/uuidd.c (limited to 'misc-utils/uuidd.c') diff --git a/misc-utils/uuidd.c b/misc-utils/uuidd.c new file mode 100644 index 0000000..ef95946 --- /dev/null +++ b/misc-utils/uuidd.c @@ -0,0 +1,714 @@ +/* + * uuidd.c --- UUID-generation daemon + * + * Copyright (C) 2007 Theodore Ts'o + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "uuid.h" +#include "uuidd.h" +#include "all-io.h" +#include "c.h" +#include "closestream.h" +#include "strutils.h" +#include "optutils.h" +#include "monotonic.h" +#include "timer.h" + +#ifdef HAVE_LIBSYSTEMD +# include +#endif + +#include "nls.h" + +/* length of binary representation of UUID */ +#define UUID_LEN (sizeof(uuid_t)) + +/* server loop control structure */ +struct uuidd_cxt_t { + const char *cleanup_pidfile; + const char *cleanup_socket; + uint32_t timeout; + unsigned int debug: 1, + quiet: 1, + no_fork: 1, + no_sock: 1; +}; + +static void __attribute__((__noreturn__)) usage(void) +{ + FILE *out = stdout; + fputs(USAGE_HEADER, out); + fprintf(out, _(" %s [options]\n"), program_invocation_short_name); + fputs(USAGE_SEPARATOR, out); + fputs(_("A daemon for generating UUIDs.\n"), out); + fputs(USAGE_OPTIONS, out); + fputs(_(" -p, --pid path to pid file\n"), out); + fputs(_(" -s, --socket path to socket\n"), out); + fputs(_(" -T, --timeout specify inactivity timeout\n"), out); + fputs(_(" -k, --kill kill running daemon\n"), out); + fputs(_(" -r, --random test random-based generation\n"), out); + fputs(_(" -t, --time test time-based generation\n"), out); + fputs(_(" -n, --uuids request number of uuids\n"), out); + fputs(_(" -P, --no-pid do not create pid file\n"), out); + fputs(_(" -F, --no-fork do not daemonize using double-fork\n"), out); + fputs(_(" -S, --socket-activation do not create listening socket\n"), out); + fputs(_(" -d, --debug run in debugging mode\n"), out); + fputs(_(" -q, --quiet turn on quiet mode\n"), out); + fputs(USAGE_SEPARATOR, out); + printf(USAGE_HELP_OPTIONS(25)); + printf(USAGE_MAN_TAIL("uuidd(8)")); + exit(EXIT_SUCCESS); +} + +static void create_daemon(void) +{ + uid_t euid; + + if (daemon(0, 0)) + err(EXIT_FAILURE, "daemon"); + + euid = geteuid(); + if (setreuid(euid, euid) < 0) + err(EXIT_FAILURE, "setreuid"); +} + +static int call_daemon(const char *socket_path, int op, char *buf, + size_t buflen, int *num, const char **err_context) +{ + char op_buf[8]; + int op_len; + int s; + ssize_t ret; + int32_t reply_len = 0; + struct sockaddr_un srv_addr; + + if (((op == UUIDD_OP_BULK_TIME_UUID) || + (op == UUIDD_OP_BULK_RANDOM_UUID)) && !num) { + if (err_context) + *err_context = _("bad arguments"); + errno = EINVAL; + return -1; + } + + if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { + if (err_context) + *err_context = _("socket"); + return -1; + } + + srv_addr.sun_family = AF_UNIX; + assert(strlen(socket_path) < sizeof(srv_addr.sun_path)); + xstrncpy(srv_addr.sun_path, socket_path, sizeof(srv_addr.sun_path)); + + if (connect(s, (const struct sockaddr *) &srv_addr, + sizeof(struct sockaddr_un)) < 0) { + if (err_context) + *err_context = _("connect"); + close(s); + return -1; + } + + if (op == UUIDD_OP_BULK_RANDOM_UUID) { + if ((*num) * UUID_LEN > buflen - 4) + *num = (buflen - 4) / UUID_LEN; + } + op_buf[0] = op; + op_len = 1; + if ((op == UUIDD_OP_BULK_TIME_UUID) || + (op == UUIDD_OP_BULK_RANDOM_UUID)) { + memcpy(op_buf + 1, num, sizeof(int)); + op_len += sizeof(int); + } + + ret = write_all(s, op_buf, op_len); + if (ret < 0) { + if (err_context) + *err_context = _("write"); + close(s); + return -1; + } + + ret = read_all(s, (char *) &reply_len, sizeof(reply_len)); + if (ret < 0) { + if (err_context) + *err_context = _("read count"); + close(s); + return -1; + } + if (reply_len < 0 || (size_t) reply_len > buflen) { + if (err_context) + *err_context = _("bad response length"); + close(s); + return -1; + } + ret = read_all(s, (char *) buf, reply_len); + + if ((ret > 0) && (op == UUIDD_OP_BULK_TIME_UUID)) { + if (reply_len >= (int) (UUID_LEN + sizeof(int))) + memcpy(buf + UUID_LEN, num, sizeof(int)); + else + *num = -1; + } + if ((ret > 0) && (op == UUIDD_OP_BULK_RANDOM_UUID)) { + if (reply_len >= (int) sizeof(int)) + memcpy(buf, num, sizeof(int)); + else + *num = -1; + } + + close(s); + + return ret; +} + +/* + * Exclusively create and open a pid file with path @pidfile_path + * + * Return file descriptor of the created pid_file. + */ +static int create_pidfile(struct uuidd_cxt_t *cxt, const char *pidfile_path) +{ + int fd_pidfile; + struct flock fl; + + fd_pidfile = open(pidfile_path, O_CREAT | O_RDWR, 0664); + if (fd_pidfile < 0) { + if (!cxt->quiet) + warn(_("cannot open %s"), pidfile_path); + exit(EXIT_FAILURE); + } + cxt->cleanup_pidfile = pidfile_path; + + fl.l_type = F_WRLCK; + fl.l_whence = SEEK_SET; + fl.l_start = 0; + fl.l_len = 0; + fl.l_pid = 0; + while (fcntl(fd_pidfile, F_SETLKW, &fl) < 0) { + if ((errno == EAGAIN) || (errno == EINTR)) + continue; + if (!cxt->quiet) + warn(_("cannot lock %s"), pidfile_path); + exit(EXIT_FAILURE); + } + + return fd_pidfile; +} + +/* + * Create AF_UNIX, SOCK_STREAM socket and bind to @socket_path + * + * If @will_fork is true, then make sure the descriptor + * of the socket is >2, so that it won't be later closed + * during create_daemon(). + * + * Return file descriptor corresponding to created socket. + */ +static int create_socket(struct uuidd_cxt_t *uuidd_cxt, + const char *socket_path, int will_fork) +{ + struct sockaddr_un my_addr; + mode_t save_umask; + int s; + + if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { + if (!uuidd_cxt->quiet) + warn(_("couldn't create unix stream socket")); + exit(EXIT_FAILURE); + } + + /* + * Make sure the socket isn't using fd numbers 0-2 to avoid it + * getting closed by create_daemon() + */ + while (will_fork && s <= 2) { + s = dup(s); + if (s < 0) + err(EXIT_FAILURE, "dup"); + } + + /* + * Create the address we will be binding to. + */ + my_addr.sun_family = AF_UNIX; + assert(strlen(socket_path) < sizeof(my_addr.sun_path)); + xstrncpy(my_addr.sun_path, socket_path, sizeof(my_addr.sun_path)); + unlink(socket_path); + save_umask = umask(0); + if (bind(s, (const struct sockaddr *) &my_addr, + sizeof(struct sockaddr_un)) < 0) { + if (!uuidd_cxt->quiet) + warn(_("couldn't bind unix socket %s"), socket_path); + exit(EXIT_FAILURE); + } + umask(save_umask); + uuidd_cxt->cleanup_socket = socket_path; + + return s; +} + +static void __attribute__((__noreturn__)) all_done(const struct uuidd_cxt_t *uuidd_cxt, int ret) +{ + if (uuidd_cxt->cleanup_pidfile) + unlink(uuidd_cxt->cleanup_pidfile); + if (uuidd_cxt->cleanup_socket) + unlink(uuidd_cxt->cleanup_socket); + exit(ret); +} + +static void handle_signal(const struct uuidd_cxt_t *uuidd_cxt, int fd) +{ + struct signalfd_siginfo info; + ssize_t bytes; + + bytes = read(fd, &info, sizeof(info)); + if (bytes != sizeof(info)) { + if (errno == EAGAIN) + return; + warn(_("receiving signal failed")); + info.ssi_signo = 0; + } + if (info.ssi_signo == SIGPIPE) + return; /* ignored */ + all_done(uuidd_cxt, EXIT_SUCCESS); +} + +static void timeout_handler(int sig __attribute__((__unused__)), + siginfo_t * info, + void *context __attribute__((__unused__))) +{ +#ifdef HAVE_TIMER_CREATE + if (info->si_code == SI_TIMER) +#endif + errx(EXIT_FAILURE, _("timed out")); +} + +static void server_loop(const char *socket_path, const char *pidfile_path, + struct uuidd_cxt_t *uuidd_cxt) +{ + struct sockaddr_un from_addr; + socklen_t fromlen; + int32_t reply_len = 0; + uuid_t uu; + char reply_buf[1024], *cp; + char op, str[UUID_STR_LEN]; + int i, ns, len; + int num; /* intentionally uninitialized */ + int s = 0; + int fd_pidfile = -1; + int ret; + struct pollfd pfd[2]; + sigset_t sigmask; + int sigfd; + enum { + POLLFD_SIGNAL = 0, + POLLFD_SOCKET + }; + +#ifdef HAVE_LIBSYSTEMD + if (!uuidd_cxt->no_sock) /* no_sock implies no_fork and no_pid */ +#endif + { + struct ul_timer timer; + struct itimerval timeout; + + memset(&timeout, 0, sizeof timeout); + timeout.it_value.tv_sec = 30; + if (setup_timer(&timer, &timeout, &timeout_handler)) + err(EXIT_FAILURE, _("cannot set up timer")); + if (pidfile_path) + fd_pidfile = create_pidfile(uuidd_cxt, pidfile_path); + ret = call_daemon(socket_path, UUIDD_OP_GETPID, reply_buf, + sizeof(reply_buf), 0, NULL); + cancel_timer(&timer); + if (ret > 0) { + if (!uuidd_cxt->quiet) + warnx(_("uuidd daemon is already running at pid %s"), + reply_buf); + exit(EXIT_FAILURE); + } + + s = create_socket(uuidd_cxt, socket_path, + (!uuidd_cxt->debug || !uuidd_cxt->no_fork)); + if (listen(s, SOMAXCONN) < 0) { + if (!uuidd_cxt->quiet) + warn(_("couldn't listen on unix socket %s"), socket_path); + exit(EXIT_FAILURE); + } + + if (!uuidd_cxt->debug && !uuidd_cxt->no_fork) + create_daemon(); + + if (pidfile_path) { + sprintf(reply_buf, "%8d\n", getpid()); + if (ftruncate(fd_pidfile, 0)) + err(EXIT_FAILURE, _("could not truncate file: %s"), pidfile_path); + write_all(fd_pidfile, reply_buf, strlen(reply_buf)); + if (fd_pidfile > 1 && close_fd(fd_pidfile) != 0) + err(EXIT_FAILURE, _("write failed: %s"), pidfile_path); + } + + } + +#ifdef HAVE_LIBSYSTEMD + if (uuidd_cxt->no_sock) { + const int r = sd_listen_fds(0); + + if (r < 0) { + errno = r * -1; + err(EXIT_FAILURE, _("sd_listen_fds() failed")); + } else if (r == 0) + errx(EXIT_FAILURE, + _("no file descriptors received, check systemctl status uuidd.socket")); + else if (1 < r) + errx(EXIT_FAILURE, + _("too many file descriptors received, check uuidd.socket")); + s = SD_LISTEN_FDS_START + 0; + } +#endif + + sigemptyset(&sigmask); + sigaddset(&sigmask, SIGHUP); + sigaddset(&sigmask, SIGINT); + sigaddset(&sigmask, SIGTERM); + sigaddset(&sigmask, SIGALRM); + sigaddset(&sigmask, SIGPIPE); + /* Block signals so that they aren't handled according to their + * default dispositions */ + sigprocmask(SIG_BLOCK, &sigmask, NULL); + if ((sigfd = signalfd(-1, &sigmask, 0)) < 0) + err(EXIT_FAILURE, _("cannot set signal handler")); + + pfd[POLLFD_SIGNAL].fd = sigfd; + pfd[POLLFD_SOCKET].fd = s; + pfd[POLLFD_SIGNAL].events = pfd[POLLFD_SOCKET].events = POLLIN | POLLERR | POLLHUP; + + while (1) { + ret = poll(pfd, ARRAY_SIZE(pfd), + uuidd_cxt->timeout ? + (int) uuidd_cxt->timeout * 1000 : -1); + if (ret < 0) { + if (errno == EAGAIN) + continue; + warn(_("poll failed")); + all_done(uuidd_cxt, EXIT_FAILURE); + } + if (ret == 0) { /* true when poll() times out */ + if (uuidd_cxt->debug) + fprintf(stderr, _("timeout [%d sec]\n"), uuidd_cxt->timeout), + all_done(uuidd_cxt, EXIT_SUCCESS); + } + if (pfd[POLLFD_SIGNAL].revents != 0) + handle_signal(uuidd_cxt, sigfd); + if (pfd[POLLFD_SOCKET].revents == 0) + continue; + fromlen = sizeof(from_addr); + ns = accept(s, (struct sockaddr *) &from_addr, &fromlen); + if (ns < 0) { + if ((errno == EAGAIN) || (errno == EINTR)) + continue; + err(EXIT_FAILURE, "accept"); + } + len = read(ns, &op, 1); + if (len != 1) { + if (len < 0) + warn(_("read failed")); + else + warnx(_("error reading from client, len = %d"), + len); + goto shutdown_socket; + } + if ((op == UUIDD_OP_BULK_TIME_UUID) || + (op == UUIDD_OP_BULK_RANDOM_UUID)) { + if (read_all(ns, (char *) &num, sizeof(num)) != 4) + goto shutdown_socket; + if (uuidd_cxt->debug) + fprintf(stderr, _("operation %d, incoming num = %d\n"), + op, num); + } else if (uuidd_cxt->debug) + fprintf(stderr, _("operation %d\n"), op); + + switch (op) { + case UUIDD_OP_GETPID: + sprintf(reply_buf, "%d", getpid()); + reply_len = strlen(reply_buf) + 1; + break; + case UUIDD_OP_GET_MAXOP: + sprintf(reply_buf, "%d", UUIDD_MAX_OP); + reply_len = strlen(reply_buf) + 1; + break; + case UUIDD_OP_TIME_UUID: + num = 1; + __uuid_generate_time(uu, &num); + if (uuidd_cxt->debug) { + uuid_unparse(uu, str); + fprintf(stderr, _("Generated time UUID: %s\n"), str); + } + memcpy(reply_buf, uu, sizeof(uu)); + reply_len = sizeof(uu); + break; + case UUIDD_OP_RANDOM_UUID: + num = 1; + __uuid_generate_random(uu, &num); + if (uuidd_cxt->debug) { + uuid_unparse(uu, str); + fprintf(stderr, _("Generated random UUID: %s\n"), str); + } + memcpy(reply_buf, uu, sizeof(uu)); + reply_len = sizeof(uu); + break; + case UUIDD_OP_BULK_TIME_UUID: + __uuid_generate_time(uu, &num); + if (uuidd_cxt->debug) { + uuid_unparse(uu, str); + fprintf(stderr, P_("Generated time UUID %s " + "and %d following\n", + "Generated time UUID %s " + "and %d following\n", num - 1), + str, num - 1); + } + memcpy(reply_buf, uu, sizeof(uu)); + reply_len = sizeof(uu); + memcpy(reply_buf + reply_len, &num, sizeof(num)); + reply_len += sizeof(num); + break; + case UUIDD_OP_BULK_RANDOM_UUID: + if (num < 0) + num = 1; + if (num > 1000) + num = 1000; + if (num * UUID_LEN > (int) (sizeof(reply_buf) - sizeof(num))) + num = (sizeof(reply_buf) - sizeof(num)) / UUID_LEN; + __uuid_generate_random((unsigned char *) reply_buf + + sizeof(num), &num); + if (uuidd_cxt->debug) { + fprintf(stderr, P_("Generated %d UUID:\n", + "Generated %d UUIDs:\n", num), num); + for (i = 0, cp = reply_buf + sizeof(num); + i < num; + i++, cp += UUID_LEN) { + uuid_unparse((unsigned char *)cp, str); + fprintf(stderr, "\t%s\n", str); + } + } + reply_len = (num * UUID_LEN) + sizeof(num); + memcpy(reply_buf, &num, sizeof(num)); + break; + default: + if (uuidd_cxt->debug) + fprintf(stderr, _("Invalid operation %d\n"), op); + goto shutdown_socket; + } + write_all(ns, (char *) &reply_len, sizeof(reply_len)); + write_all(ns, reply_buf, reply_len); + shutdown_socket: + close(ns); + } +} + +static void __attribute__ ((__noreturn__)) unexpected_size(int size) +{ + errx(EXIT_FAILURE, _("Unexpected reply length from server %d"), size); +} + +int main(int argc, char **argv) +{ + const char *socket_path = UUIDD_SOCKET_PATH; + const char *pidfile_path = NULL; + const char *err_context = NULL; + char buf[1024], *cp; + char str[UUID_STR_LEN]; + uuid_t uu; + int i, c, ret; + int do_type = 0, do_kill = 0, num = 0; + int no_pid = 0; + int s_flag = 0; + + struct uuidd_cxt_t uuidd_cxt = { .timeout = 0 }; + + static const struct option longopts[] = { + {"pid", required_argument, NULL, 'p'}, + {"socket", required_argument, NULL, 's'}, + {"timeout", required_argument, NULL, 'T'}, + {"kill", no_argument, NULL, 'k'}, + {"random", no_argument, NULL, 'r'}, + {"time", no_argument, NULL, 't'}, + {"uuids", required_argument, NULL, 'n'}, + {"no-pid", no_argument, NULL, 'P'}, + {"no-fork", no_argument, NULL, 'F'}, + {"socket-activation", no_argument, NULL, 'S'}, + {"debug", no_argument, NULL, 'd'}, + {"quiet", no_argument, NULL, 'q'}, + {"version", no_argument, NULL, 'V'}, + {"help", no_argument, NULL, 'h'}, + {NULL, 0, NULL, 0} + }; + static const ul_excl_t excl[] = { + { 'P', 'p' }, + { 'd', 'q' }, + { 'r', 't' }, + { 0 } + }; + int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + close_stdout_atexit(); + + while ((c = + getopt_long(argc, argv, "p:s:T:krtn:PFSdqVh", longopts, + NULL)) != -1) { + err_exclusive_options(c, longopts, excl, excl_st); + switch (c) { + case 'd': + uuidd_cxt.debug = 1; + break; + case 'k': + do_kill++; + break; + case 'n': + num = strtou32_or_err(optarg, + _("failed to parse --uuids")); + break; + case 'p': + pidfile_path = optarg; + break; + case 'P': + no_pid = 1; + break; + case 'F': + uuidd_cxt.no_fork = 1; + break; + case 'S': +#ifdef HAVE_LIBSYSTEMD + uuidd_cxt.no_sock = 1; + uuidd_cxt.no_fork = 1; + no_pid = 1; +#else + errx(EXIT_FAILURE, _("uuidd has been built without " + "support for socket activation")); +#endif + break; + case 'q': + uuidd_cxt.quiet = 1; + break; + case 'r': + do_type = UUIDD_OP_RANDOM_UUID; + break; + case 's': + socket_path = optarg; + s_flag = 1; + break; + case 't': + do_type = UUIDD_OP_TIME_UUID; + break; + case 'T': + uuidd_cxt.timeout = strtou32_or_err(optarg, + _("failed to parse --timeout")); + break; + + case 'V': + print_version(EXIT_SUCCESS); + case 'h': + usage(); + default: + errtryhelp(EXIT_FAILURE); + } + } + + if (strlen(socket_path) >= sizeof(((struct sockaddr_un *)0)->sun_path)) + errx(EXIT_FAILURE, _("socket name too long: %s"), socket_path); + + if (!no_pid && !pidfile_path) + pidfile_path = UUIDD_PIDFILE_PATH; + + /* custom socket path and socket-activation make no sense */ + if (s_flag && uuidd_cxt.no_sock && !uuidd_cxt.quiet) + warnx(_("Both --socket-activation and --socket specified. " + "Ignoring --socket.")); + + if (num && do_type) { + ret = call_daemon(socket_path, do_type + 2, buf, + sizeof(buf), &num, &err_context); + if (ret < 0) + err(EXIT_FAILURE, _("error calling uuidd daemon (%s)"), + err_context ? : _("unexpected error")); + + if (do_type == UUIDD_OP_TIME_UUID) { + if (ret != sizeof(uu) + sizeof(num)) + unexpected_size(ret); + + uuid_unparse((unsigned char *) buf, str); + + printf(P_("%s and %d subsequent UUID\n", + "%s and %d subsequent UUIDs\n", num - 1), + str, num - 1); + } else { + printf(_("List of UUIDs:\n")); + cp = buf + 4; + if (ret != (int) (sizeof(num) + num * sizeof(uu))) + unexpected_size(ret); + for (i = 0; i < num; i++, cp += UUID_LEN) { + uuid_unparse((unsigned char *) cp, str); + printf("\t%s\n", str); + } + } + return EXIT_SUCCESS; + } + if (do_type) { + ret = call_daemon(socket_path, do_type, (char *) &uu, + sizeof(uu), 0, &err_context); + if (ret < 0) + err(EXIT_FAILURE, _("error calling uuidd daemon (%s)"), + err_context ? : _("unexpected error")); + if (ret != sizeof(uu)) + unexpected_size(ret); + + uuid_unparse(uu, str); + + printf("%s\n", str); + return EXIT_SUCCESS; + } + + if (do_kill) { + ret = call_daemon(socket_path, UUIDD_OP_GETPID, buf, sizeof(buf), 0, NULL); + if ((ret > 0) && ((do_kill = atoi((char *) buf)) > 0)) { + ret = kill(do_kill, SIGTERM); + if (ret < 0) { + if (!uuidd_cxt.quiet) + warn(_("couldn't kill uuidd running " + "at pid %d"), do_kill); + return EXIT_FAILURE; + } + if (!uuidd_cxt.quiet) + printf(_("Killed uuidd running at pid %d.\n"), + do_kill); + } + return EXIT_SUCCESS; + } + + server_loop(socket_path, pidfile_path, &uuidd_cxt); + return EXIT_SUCCESS; +} -- cgit v1.2.3