From 4897093455a2bf08f3db3a1132cc2f6f5484d77c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 08:03:02 +0200 Subject: Adding upstream version 1:2.6.4. Signed-off-by: Daniel Baumann --- utils/exportd/Makefile.am | 67 ++++ utils/exportd/Makefile.in | 880 ++++++++++++++++++++++++++++++++++++++++++++++ utils/exportd/exportd.c | 247 +++++++++++++ utils/exportd/exportd.man | 141 ++++++++ 4 files changed, 1335 insertions(+) create mode 100644 utils/exportd/Makefile.am create mode 100644 utils/exportd/Makefile.in create mode 100644 utils/exportd/exportd.c create mode 100644 utils/exportd/exportd.man (limited to 'utils/exportd') diff --git a/utils/exportd/Makefile.am b/utils/exportd/Makefile.am new file mode 100644 index 0000000..26078c9 --- /dev/null +++ b/utils/exportd/Makefile.am @@ -0,0 +1,67 @@ +## Process this file with automake to produce Makefile.in + +OPTLIBS = +if CONFIG_JUNCTION +OPTLIBS += ../../support/junction/libjunction.la $(LIBXML2) +endif + +man8_MANS = exportd.man +EXTRA_DIST = $(man8_MANS) + +NFSPREFIX = nfsv4. +KPREFIX = @kprefix@ +sbin_PROGRAMS = exportd + +exportd_SOURCES = exportd.c +exportd_LDADD = ../../support/export/libexport.a \ + ../../support/nfs/libnfs.la \ + ../../support/misc/libmisc.a \ + ../../support/reexport/libreexport.a \ + $(OPTLIBS) $(LIBBLKID) $(LIBPTHREAD) \ + -luuid + +exportd_CPPFLAGS = $(AM_CPPFLAGS) $(CPPFLAGS) \ + -I$(top_srcdir)/support/export + +MAINTAINERCLEANFILES = Makefile.in + +####################################################################### +# The following allows the current practice of having +# daemons renamed during the install to include NFSPREFIX +# and the KPREFIX +# This could all be done much easier with program_transform_name +# ( program_transform_name = s/^/$(NFSPREFIX)$(KPREFIX)/ ) +# but that also renames the man pages, which the current +# practice does not do. +install-exec-hook: + (cd $(DESTDIR)$(sbindir) && \ + for p in $(sbin_PROGRAMS); 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Default is 1 and + * that's probably enough unless you need hundreds of + * clients to be able to mount at once. */ +static int num_threads = 1; +/* Arbitrary limit on number of threads */ +#define MAX_THREADS 64 + +int manage_gids; +int use_ipaddr = -1; + +static struct option longopts[] = +{ + { "foreground", 0, 0, 'F' }, + { "debug", 1, 0, 'd' }, + { "help", 0, 0, 'h' }, + { "manage-gids", 0, 0, 'g' }, + { "num-threads", 1, 0, 't' }, + { "log-auth", 0, 0, 'l' }, + { "cache-use-ipaddr", 0, 0, 'i' }, + { "ttl", 0, 0, 'T' }, + { NULL, 0, 0, 0 } +}; +static char shortopts[] = "d:fghs:t:liT:"; + +/* + * Signal handlers. + */ +inline static void set_signals(void); + +inline void +cleanup_lockfiles (void) +{ + unlink(etab.lockfn); +} + +static void +killer (int sig) +{ + if (num_threads > 1) { + /* play Kronos and eat our children */ + kill(0, SIGTERM); + cache_wait_for_workers("exportd"); + } + cleanup_lockfiles(); + free_state_path_names(&etab); + xlog (L_NOTICE, "Caught signal %d, exiting.", sig); + + exit(0); +} + +static void +sig_hup (int UNUSED(sig)) +{ + /* don't exit on SIGHUP */ + xlog (L_NOTICE, "Received SIGHUP... Ignoring.\n"); + return; +} + +inline static void +set_signals(void) +{ + struct sigaction sa; + + sa.sa_handler = SIG_IGN; + sa.sa_flags = 0; + sigemptyset(&sa.sa_mask); + sigaction(SIGPIPE, &sa, NULL); + /* WARNING: the following works on Linux and SysV, but not BSD! */ + sigaction(SIGCHLD, &sa, NULL); + + sa.sa_handler = killer; + sigaction(SIGINT, &sa, NULL); + sigaction(SIGTERM, &sa, NULL); + + sa.sa_handler = sig_hup; + sigaction(SIGHUP, &sa, NULL); +} + +static void +usage(const char *prog, int n) +{ + fprintf(stderr, + "Usage: %s [-f|--foreground] [-h|--help] [-d kind|--debug kind]\n" +" [-g|--manage-gids] [-l|--log-auth] [-i|--cache-use-ipaddr] [-T|--ttl ttl]\n" +" [-s|--state-directory-path path]\n" +" [-t num|--num-threads=num]\n", prog); + exit(n); +} + +inline static void +read_exportd_conf(char *progname, char **argv) +{ + char *s; + int ttl; + + conf_init_file(NFS_CONFFILE); + + xlog_set_debug(progname); + + manage_gids = conf_get_bool("exportd", "manage-gids", manage_gids); + num_threads = conf_get_num("exportd", "threads", num_threads); + if (conf_get_bool("mountd", "cache-use-ipaddr", 0)) + use_ipaddr = 2; + + s = conf_get_str("exportd", "state-directory-path"); + if (s && !state_setup_basedir(argv[0], s)) + exit(1); + + ttl = conf_get_num("mountd", "ttl", default_ttl); + if (ttl > 0) + default_ttl = ttl; +} + +int +main(int argc, char **argv) +{ + char *progname; + int foreground = 0; + int c; + int ttl; + + /* Set the basename */ + if ((progname = strrchr(argv[0], '/')) != NULL) + progname++; + else + progname = argv[0]; + + /* Initialize logging. */ + xlog_open(progname); + + /* Read in config setting */ + read_exportd_conf(progname, argv); + + while ((c = getopt_long(argc, argv, shortopts, longopts, NULL)) != EOF) { + switch (c) { + case 'd': + xlog_sconfig(optarg, 1); + break; + case 'l': + xlog_sconfig("auth", 1); + break; + case 'f': + foreground++; + break; + case 'g': + manage_gids = 1; + break; + case 'h': + usage(progname, 0); + break; + case 'i': + use_ipaddr = 2; + break; + case 'T': + ttl = atoi(optarg); + if (ttl <= 0) { + fprintf(stderr, "%s: bad ttl number of seconds: %s\n", + argv[0], optarg); + usage(argv[0], 1); + } + default_ttl = ttl; + break; + case 's': + if (!state_setup_basedir(argv[0], optarg)) + exit(1); + break; + case 't': + num_threads = atoi (optarg); + break; + case '?': + default: + usage(progname, 1); + } + + } + + if (!setup_state_path_names(progname, ETAB, ETABTMP, ETABLCK, &etab)) + return 1; + + if (!foreground) + xlog_stderr(0); + + daemon_init(foreground); + + set_signals(); + daemon_ready(); + + /* silently bounds check num_threads */ + if (foreground) + num_threads = 1; + else if (num_threads < 1) + num_threads = 1; + else if (num_threads > MAX_THREADS) + num_threads = MAX_THREADS; + + /* Open cache channel files BEFORE forking so each upcall is + * only handled by one thread. Kernel provides locking for both + * read and write. + */ + cache_open(); + + if (cache_fork_workers(progname, num_threads) == 0) { + /* We forked, waited, and now need to clean up */ + cleanup_lockfiles(); + free_state_path_names(&etab); + xlog(L_NOTICE, "%s: no more workers, exiting\n", progname); + exit(0); + } + + v4clients_init(); + + /* Process incoming upcalls */ + while (cache_process(NULL) >= 0) + ; + + xlog(L_ERROR, "%s: process loop terminated unexpectedly(%m). Exiting...\n", + progname); + + free_state_path_names(&etab); + exit(1); +} diff --git a/utils/exportd/exportd.man b/utils/exportd/exportd.man new file mode 100644 index 0000000..fae434b --- /dev/null +++ b/utils/exportd/exportd.man @@ -0,0 +1,141 @@ +.\"@(#)nfsv4.exportd.8" +.\" +.\" Copyright (C) 2021 Red Hat +.\" +.TH nfsv4.exportd 8 "02 Feb 2021" +.SH NAME +nfsv4.exportd \- NFSv4 Server Mount Daemon +.SH SYNOPSIS +.BI "/usr/sbin/nfsv4.exportd [" options "]" +.SH DESCRIPTION +The +.B nfsv4.exportd +is used to manage NFSv4 exports. +The NFS server +.RI ( nfsd ) +maintains a cache of authentication and authorization information which +is used to identify the source of each request, and then what access +permissions that source has to any local filesystem. When required +information is not found in the cache, the server sends a request to +.B nfsv4.exportd +to fill in the missing information. +.B nfsv4.exportd +uses a table of information stored in +.B /var/lib/nfs/etab +and maintained by +.BR exportfs (8), +possibly based on the contents of +.BR exports (5), +to respond to each request. +.SH OPTIONS +.TP +.B \-d kind " or " \-\-debug kind +Turn on debugging. Valid kinds are: all, auth, call, general and parse. +.TP +.BR \-l " or " \-\-log\-auth +Enable logging of responses to authentication and access requests from +nfsd. Each response is then cached by the kernel for 30 minutes (or as set by +.B \-\-ttl +below), and will be refreshed after 15 minutes (half the ttl time) if +the relevant client remains active. +Note that +.B -l +is equivalent to +.B "-d auth" +and so can be enabled in +.B /etc/nfs.conf +with +.B "\[dq]debug = auth\[dq]" +in the +.B "[exportd]" +section. +.TP +.BR \-i " or " \-\-cache\-use\-ipaddr +Normally each client IP address is matched against each host identifier +(name, wildcard, netgroup etc) found in +.B /etc/exports +and a combined identity is formed from all matching identifiers. +Often many clients will map to the same combined identity so performing +this mapping reduces the number of distinct access details that the +kernel needs to store. +Specifying the +.B \-i +option suppresses this mapping so that access to each filesystem is +requested and cached separately for each client IP address. Doing this +can increase the burden of updating the cache slightly, but can make the +log messages produced by the +.B -l +option easier to read. +.TP +.B \-T " or " \-\-ttl +Provide a time-to-live (TTL) for cached information given to the kernel. +The kernel will normally request an update if the information is needed +after half of this time has expired. Increasing the provided number, +which is in seconds, reduces the rate of cache update requests, and this +is particularly noticeable when these requests are logged with +.BR \-l . +However increasing also means that changes to hostname to address +mappings can take longer to be noticed. +The default TTL is 1800 (30 minutes). +.TP +.B \-F " or " \-\-foreground +Run in foreground (do not daemonize) +.TP +.B \-h " or " \-\-help +Display usage message. +.TP +.BR "\-t N" " or " "\-\-num\-threads=N " or " \-\-num\-threads N " +This option specifies the number of worker threads that +.B nfsv4.exports +spawns. The default is 1 thread, which is probably enough. More +threads are usually only needed for NFS servers which need to handle +mount storms of hundreds of NFS mounts in a few seconds, or when +your DNS server is slow or unreliable. +.TP +.BR \-g " or " \-\-manage-gids +Accept requests from the kernel to map user id numbers into lists of +group id numbers for use in access control. An NFS request will +normally (except when using Kerberos or other cryptographic +authentication) contain a user-id and a list of group-ids. Due to a +limitation in the NFS protocol, at most 16 groups ids can be listed. +If you use the +.B \-g +flag, then the list of group ids received from the client will be +replaced by a list of group ids determined by an appropriate lookup on +the server. Note that the 'primary' group id is not affected so a +.B newgroup +command on the client will still be effective. This function requires +a Linux Kernel with version at least 2.6.21. +.SH CONFIGURATION FILE +Many of the options that can be set on the command line can also be +controlled through values set in the +.B [exportd] +or, in some cases, the +.B [nfsd] +sections of the +.I /etc/nfs.conf +configuration file. +Values recognized in the +.B [exportd] +section include +.B cache\-use\-ipaddr , +.BR ttl , +.BR manage-gids ", and" +.B debug +which each have the same effect as the option with the same name. +.SH FILES +.TP 2.5i +.I /etc/exports +input file for +.BR exportfs , +listing exports, export options, and access control lists +.SH SEE ALSO +.BR exportfs (8), +.BR exports (5), +.BR showmount (8), +.BR nfs.conf (5), +.BR firewall-cmd (1), +.sp +RFC 7530 - "Network File System (NFS) Version 4 Protocol" +.br +RFC 8881 - "Network File System (NFS) Version 4 Minor Version 1 Protocol" -- cgit v1.2.3