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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 06:03:02 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 06:03:02 +0000 |
commit | 4897093455a2bf08f3db3a1132cc2f6f5484d77c (patch) | |
tree | 9e6373544263f003139431fb4b08f9766e1ed530 /utils/nfsdcltrack | |
parent | Initial commit. (diff) | |
download | nfs-utils-4897093455a2bf08f3db3a1132cc2f6f5484d77c.tar.xz nfs-utils-4897093455a2bf08f3db3a1132cc2f6f5484d77c.zip |
Adding upstream version 1:2.6.4.upstream/1%2.6.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'utils/nfsdcltrack')
-rw-r--r-- | utils/nfsdcltrack/Makefile.am | 22 | ||||
-rw-r--r-- | utils/nfsdcltrack/Makefile.in | 823 | ||||
-rw-r--r-- | utils/nfsdcltrack/nfsdcltrack.c | 639 | ||||
-rw-r--r-- | utils/nfsdcltrack/nfsdcltrack.man | 112 | ||||
-rw-r--r-- | utils/nfsdcltrack/sqlite.c | 604 | ||||
-rw-r--r-- | utils/nfsdcltrack/sqlite.h | 32 |
6 files changed, 2232 insertions, 0 deletions
diff --git a/utils/nfsdcltrack/Makefile.am b/utils/nfsdcltrack/Makefile.am new file mode 100644 index 0000000..769e4a4 --- /dev/null +++ b/utils/nfsdcltrack/Makefile.am @@ -0,0 +1,22 @@ +## Process this file with automake to produce Makefile.in + +# These binaries go in /sbin (not /usr/sbin) as the kernel "knows" the +# /sbin name. 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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 + * of the License, or (at your option) any later version. + * + * 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., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif /* HAVE_CONFIG_H */ + +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <errno.h> +#include <stdbool.h> +#include <getopt.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <fcntl.h> +#include <inttypes.h> +#include <unistd.h> +#include <libgen.h> +#include <sys/inotify.h> +#include <dirent.h> +#include <limits.h> +#ifdef HAVE_SYS_CAPABILITY_H +#include <sys/prctl.h> +#include <sys/capability.h> +#endif + +#include "conffile.h" +#include "xlog.h" +#include "sqlite.h" + +#ifndef CLD_DEFAULT_STORAGEDIR +#define CLD_DEFAULT_STORAGEDIR NFS_STATEDIR "/nfsdcltrack" +#endif + +#define NFSD_END_GRACE_FILE "/proc/fs/nfsd/v4_end_grace" + +/* defined by RFC 3530 */ +#define NFS4_OPAQUE_LIMIT 1024 + +/* private data structures */ +struct cltrack_cmd { + char *name; + bool needs_arg; + int (*func)(const char *arg); +}; + +/* forward declarations */ +static int cltrack_init(const char *unused); +static int cltrack_create(const char *id); +static int cltrack_remove(const char *id); +static int cltrack_check(const char *id); +static int cltrack_gracedone(const char *gracetime); + +/* global variables */ +static struct option longopts[] = +{ + { "help", 0, NULL, 'h' }, + { "debug", 0, NULL, 'd' }, + { "foreground", 0, NULL, 'f' }, + { "storagedir", 1, NULL, 's' }, + { NULL, 0, 0, 0 }, +}; + +static struct cltrack_cmd commands[] = +{ + { "init", false, cltrack_init }, + { "create", true, cltrack_create }, + { "remove", true, cltrack_remove }, + { "check", true, cltrack_check }, + { "gracedone", true, cltrack_gracedone }, + { NULL, false, NULL }, +}; + +static char *storagedir = CLD_DEFAULT_STORAGEDIR; + +/* common buffer for holding id4 blobs */ +static unsigned char blob[NFS4_OPAQUE_LIMIT]; + +static void +usage(char *progname) +{ + printf("Usage: %s [ -hfd ] [ -s dir ] < cmd > < arg >\n", progname); + printf("Where < cmd > is one of the following and takes the following < arg >:\n"); + printf(" init\n"); + printf(" create <nfs_client_id4>\n"); + printf(" remove <nfs_client_id4>\n"); + printf(" check <nfs_client_id4>\n"); + printf(" gracedone <epoch time>\n"); +} + + +/** + * hex_to_bin - convert a hex digit to its real value + * @ch: ascii character represents hex digit + * + * hex_to_bin() converts one hex digit to its actual value or -1 in case of bad + * input. + * + * Note: borrowed from lib/hexdump.c in the Linux kernel sources. + */ +static int +hex_to_bin(char ch) +{ + if ((ch >= '0') && (ch <= '9')) + return ch - '0'; + ch = tolower(ch); + if ((ch >= 'a') && (ch <= 'f')) + return ch - 'a' + 10; + return -1; +} + +/** + * hex_str_to_bin - convert a hexidecimal string into a binary blob + * + * @src: string of hex digit pairs + * @dst: destination buffer to hold binary data + * @dstsize: size of the destination buffer + * + * Walk a string of hex digit pairs and convert them into binary data. Returns + * the resulting length of the binary data or a negative error code. If the + * data will not fit in the buffer, it returns -ENOBUFS (but will likely have + * clobbered the dst buffer in the process of determining that). If there are + * non-hexidecimal characters in the src, or an odd number of them then it + * returns -EINVAL. + */ +static ssize_t +hex_str_to_bin(const char *src, unsigned char *dst, ssize_t dstsize) +{ + unsigned char *tmpdst = dst; + + while (*src) { + int hi, lo; + + /* make sure we don't overrun the dst buffer */ + if ((tmpdst - dst) >= dstsize) + return -ENOBUFS; + + hi = hex_to_bin(*src++); + + /* did we get an odd number of characters? */ + if (!*src) + return -EINVAL; + lo = hex_to_bin(*src++); + + /* one of the characters isn't a hex digit */ + if (hi < 0 || lo < 0) + return -EINVAL; + + /* now place it in the dst buffer */ + *tmpdst++ = (hi << 4) | lo; + } + + return (ssize_t)(tmpdst - dst); +} + +/* + * This program will almost always be run with root privileges since the + * kernel will call out to run it. Drop all capabilities prior to doing + * anything important to limit the exposure to potential compromise. + * + * FIXME: should we setuid to a different user early on instead? + */ +static int +cltrack_set_caps(void) +{ + int ret = 0; +#ifdef HAVE_SYS_CAPABILITY_H + unsigned long i; + cap_t caps; + + /* prune the bounding set to nothing */ + for (i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0 ; ++i) { + ret = prctl(PR_CAPBSET_DROP, i, 0, 0, 0); + if (ret) { + xlog(L_ERROR, "Unable to prune capability %lu from " + "bounding set: %m", i); + return -errno; + } + } + + /* get a blank capset */ + caps = cap_init(); + if (caps == NULL) { + xlog(L_ERROR, "Unable to get blank capability set: %m"); + return -errno; + } + + /* reset the process capabilities */ + if (cap_set_proc(caps) != 0) { + xlog(L_ERROR, "Unable to set process capabilities: %m"); + ret = -errno; + } + cap_free(caps); +#endif + return ret; +} + +/* Inform the kernel that it's OK to lift nfsd's grace period */ +static void +cltrack_lift_grace_period(void) +{ + int fd; + + fd = open(NFSD_END_GRACE_FILE, O_WRONLY); + if (fd < 0) { + /* Don't warn if file isn't present */ + if (errno != ENOENT) + xlog(L_WARNING, "Unable to open %s: %m", + NFSD_END_GRACE_FILE); + return; + } + + if (write(fd, "Y", 1) < 0) + xlog(L_WARNING, "Unable to write to %s: %m", + NFSD_END_GRACE_FILE); + + close(fd); + return; +} + +/* + * Fetch the contents of the NFSDCLTRACK_GRACE_START env var. If it's not set + * or there's an error converting it to time_t, then return LONG_MAX. + */ +static time_t +cltrack_get_grace_start(void) +{ + time_t grace_start; + char *end; + char *grace_start_str = getenv("NFSDCLTRACK_GRACE_START"); + + if (!grace_start_str) + return LONG_MAX; + + errno = 0; + grace_start = strtol(grace_start_str, &end, 0); + /* Problem converting or value is too large? */ + if (errno) + return LONG_MAX; + + return grace_start; +} + +static bool +cltrack_reclaims_complete(void) +{ + time_t grace_start = cltrack_get_grace_start(); + + /* Don't query DB if we didn't get a valid boot time */ + if (grace_start == LONG_MAX) + return false; + + return !sqlite_query_reclaiming(grace_start); +} + +static int +cltrack_init(const char __attribute__((unused)) *unused) +{ + int ret; + + /* + * see if the storagedir is writable by root w/o CAP_DAC_OVERRIDE. + * If it isn't then give the user a warning but proceed as if + * everything is OK. If the DB has already been created, then + * everything might still work. If it doesn't exist at all, then + * assume that the maindb init will be able to create it. Fail on + * anything else. + */ + if (access(storagedir, W_OK) == -1) { + switch (errno) { + case EACCES: + xlog(L_WARNING, "Storage directory %s is not writable. " + "Should be owned by root and writable " + "by owner!", storagedir); + break; + case ENOENT: + /* ignore and assume that we can create dir as root */ + break; + default: + xlog(L_ERROR, "Unexpected error when checking access " + "on %s: %m", storagedir); + return -errno; + } + } + + /* set up storage db */ + ret = sqlite_prepare_dbh(storagedir); + if (ret) { + xlog(L_ERROR, "Failed to init database: %d", ret); + /* + * Convert any error here into -EACCES. It's not truly + * accurate in all cases, but it should cause the kernel to + * stop upcalling until the problem is resolved. + */ + ret = -EACCES; + } else { + if (cltrack_reclaims_complete()) + cltrack_lift_grace_period(); + } + + return ret; +} + +/* + * Fetch the contents of the NFSDCLTRACK_CLIENT_HAS_SESSION env var. If + * it's set and the first character is 'Y' then return true. Otherwise + * return false. + */ +static bool +cltrack_client_has_session(void) +{ + char *has_session = getenv("NFSDCLTRACK_CLIENT_HAS_SESSION"); + + if (has_session && *has_session == 'Y') + return true; + + return false; +} + +static int +cltrack_create(const char *id) +{ + int ret; + ssize_t len; + bool has_session; + + xlog(D_GENERAL, "%s: create client record.", __func__); + + ret = sqlite_prepare_dbh(storagedir); + if (ret) + return ret; + + len = hex_str_to_bin(id, blob, sizeof(blob)); + if (len < 0) + return (int)len; + + has_session = cltrack_client_has_session(); + + ret = sqlite_insert_client(blob, len, has_session, false); + + if (!ret && has_session && cltrack_reclaims_complete()) + cltrack_lift_grace_period(); + + return ret ? -EREMOTEIO : ret; +} + +static int +cltrack_remove(const char *id) +{ + int ret; + ssize_t len; + + xlog(D_GENERAL, "%s: remove client record.", __func__); + + ret = sqlite_prepare_dbh(storagedir); + if (ret) + return ret; + + len = hex_str_to_bin(id, blob, sizeof(blob)); + if (len < 0) + return (int)len; + + ret = sqlite_remove_client(blob, len); + + return ret ? -EREMOTEIO : ret; +} + +static int +cltrack_check_legacy(const unsigned char *blob, const ssize_t len, + bool has_session) +{ + int ret; + struct stat st; + char *recdir = getenv("NFSDCLTRACK_LEGACY_RECDIR"); + + if (!recdir) { + xlog(D_GENERAL, "No NFSDCLTRACK_LEGACY_RECDIR env var"); + return -EOPNOTSUPP; + } + + /* fail recovery on any stat failure */ + ret = stat(recdir, &st); + if (ret) { + xlog(D_GENERAL, "Unable to stat %s: %d", recdir, errno); + return -errno; + } + + /* fail if it isn't a directory */ + if (!S_ISDIR(st.st_mode)) { + xlog(D_GENERAL, "%s is not a directory: mode=0%o", recdir + , st.st_mode); + return -ENOTDIR; + } + + /* Dir exists, try to insert record into db */ + ret = sqlite_insert_client(blob, len, has_session, has_session); + if (ret) { + xlog(D_GENERAL, "Failed to insert client: %d", ret); + return -EREMOTEIO; + } + + /* remove the legacy recoverydir */ + ret = rmdir(recdir); + if (ret) { + xlog(D_GENERAL, "Failed to rmdir %s: %d", recdir, errno); + return -errno; + } + return 0; +} + +static int +cltrack_check(const char *id) +{ + int ret; + ssize_t len; + bool has_session; + + xlog(D_GENERAL, "%s: check client record", __func__); + + ret = sqlite_prepare_dbh(storagedir); + if (ret) + return ret; + + len = hex_str_to_bin(id, blob, sizeof(blob)); + if (len < 0) + return (int)len; + + has_session = cltrack_client_has_session(); + + ret = sqlite_check_client(blob, len, has_session); + if (ret) + ret = cltrack_check_legacy(blob, len, has_session); + + return ret ? -EPERM : ret; +} + +/* Clean out the v4recoverydir -- best effort here */ +static void +cltrack_legacy_gracedone(void) +{ + DIR *v4recovery; + struct dirent *entry; + char *dirname = getenv("NFSDCLTRACK_LEGACY_TOPDIR"); + + if (!dirname) + return; + + v4recovery = opendir(dirname); + if (!v4recovery) + return; + + while ((entry = readdir(v4recovery))) { + int len; + + /* skip "." and ".." */ + if (entry->d_name[0] == '.') { + switch (entry->d_name[1]) { + case '\0': + continue; + case '.': + if (entry->d_name[2] == '\0') + continue; + } + } + + /* borrow the clientid blob for this */ + len = snprintf((char *)blob, sizeof(blob), "%s/%s", dirname, + entry->d_name); + + /* if there's a problem, then skip this entry */ + if (len < 0 || (size_t)len >= sizeof(blob)) { + xlog(L_WARNING, "%s: unable to build filename for %s!", + __func__, entry->d_name); + continue; + } + + len = rmdir((char *)blob); + if (len) + xlog(L_WARNING, "%s: unable to rmdir %s: %d", __func__, + (char *)blob, len); + } + + closedir(v4recovery); +} + +static int +cltrack_gracedone(const char *timestr) +{ + int ret; + char *tail; + uint64_t gracetime; + + + ret = sqlite_prepare_dbh(storagedir); + if (ret) + return ret; + + errno = 0; + gracetime = strtol(timestr, &tail, 0); + + /* did the resulting value overflow? (Probably -ERANGE here) */ + if (errno) + return -errno; + + /* string wasn't fully converted */ + if (*tail) + return -EINVAL; + + xlog(D_GENERAL, "%s: grace done. gracetime=%"PRIu64, __func__, gracetime); + + ret = sqlite_remove_unreclaimed(gracetime); + + cltrack_legacy_gracedone(); + + return ret ? -EREMOTEIO : ret; +} + +static struct cltrack_cmd * +find_cmd(char *cmdname) +{ + struct cltrack_cmd *current = &commands[0]; + + while (current->name) { + if (!strcmp(cmdname, current->name)) + return current; + ++current; + } + + xlog(L_ERROR, "%s: '%s' doesn't match any known command", + __func__, cmdname); + return NULL; +} +inline static void +read_nfsdcltrack_conf(void) +{ + char *val; + + conf_init_file(NFS_CONFFILE); + xlog_set_debug("nfsdcltrack"); + val = conf_get_str("nfsdcltrack", "storagedir"); + if (val) + storagedir = val; +} +int +main(int argc, char **argv) +{ + int arg; + int rc = 0; + char *progname, *cmdarg = NULL; + struct cltrack_cmd *cmd; + + progname = basename(argv[0]); + + xlog_syslog(1); + xlog_stderr(0); + + /* Read in config setting */ + read_nfsdcltrack_conf(); + + /* process command-line options */ + while ((arg = getopt_long(argc, argv, "hdfs:", longopts, + NULL)) != EOF) { + switch (arg) { + case 'd': + xlog_config(D_ALL, 1); + break; + case 'f': + xlog_syslog(0); + xlog_stderr(1); + break; + case 's': + storagedir = optarg; + break; + default: + usage(progname); + return 1; + } + } + + xlog_open(progname); + + /* we expect a command, at least */ + if (optind >= argc) { + xlog(L_ERROR, "Missing command name\n"); + rc = -EINVAL; + goto out; + } + + /* drop all capabilities */ + rc = cltrack_set_caps(); + if (rc) + goto out; + + cmd = find_cmd(argv[optind]); + if (!cmd) { + /* + * In the event that we get a command that we don't understand + * then return a distinct error. The kernel can use this to + * determine a new kernel/old userspace situation and cope + * with it. + */ + rc = -ENOSYS; + goto out; + } + + /* populate arg var if command needs it */ + if (cmd->needs_arg) { + if (optind + 1 >= argc) { + xlog(L_ERROR, "Command %s requires an argument\n", + cmd->name); + rc = -EINVAL; + goto out; + } + cmdarg = argv[optind + 1]; + } + rc = cmd->func(cmdarg); +out: + return rc; +} diff --git a/utils/nfsdcltrack/nfsdcltrack.man b/utils/nfsdcltrack/nfsdcltrack.man new file mode 100644 index 0000000..cc24b7a --- /dev/null +++ b/utils/nfsdcltrack/nfsdcltrack.man @@ -0,0 +1,112 @@ +.ie \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.el \{\ +. de IX +.. +.\} +.IX Title "NFSDCLTRACK 8" +.TH NFSDCLTRACK 8 "2012-10-24" "" "" +.\" For nroff, turn off justification. Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.if n .ad l +.nh +.SH "NAME" +nfsdcltrack \- NFSv4 Client Tracking Callout Program +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +nfsdcltrack [\-d] [\-f] [\-s stable storage dir] <command> <args...> +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +nfsdcltrack is the NFSv4 client tracking callout program. It is not necessary +to install this program on machines that are not acting as NFSv4 servers. +.PP +When a network partition is combined with a server reboot, there are +edge conditions that can cause the server to grant lock reclaims when +other clients have taken conflicting locks in the interim. A more detailed +explanation of this issue is described in \s-1RFC\s0 3530, section 8.6.3 +and in \s-1RFC\s0 5661, section 8.4.3. +.PP +In order to prevent these problems, the server must track a small amount +of per-client information on stable storage. This program provides the +userspace piece of that functionality. When the kernel needs to manipulate +the database that stores this info, it will execute this program to handle +it. +.SH "OPTIONS" +.IX Header "OPTIONS" +.IP "\fB\-d\fR, \fB\-\-debug\fR" 4 +.IX Item "-d, --debug" +Enable debug level logging. +.IP "\fB\-f\fR, \fB\-\-foreground\fR" 4 +.IX Item "-f, --foreground" +Log to stderr instead of syslog. +.IP "\fB\-s\fR \fIstoragedir\fR, \fB\-\-storagedir\fR=\fIstorage_dir\fR" 4 +.IX Item "-s storagedir, --storagedir=storage_dir" +Directory where stable storage information should be kept. The default +value is \fI/var/lib/nfs/nfsdcltrack\fR. +.SH "COMMANDS" +.IX Header "COMMANDS" +nfsdcltrack requires a command for each invocation. Supported commands +are: +.IP "\fBinit\fR" 4 +.IX Item "init" +Initialize the database. This command requires no argument. +.IP "\fBcreate\fR" 4 +.IX Item "create" +Create a new client record (or update the timestamp on an existing one). This command requires a hex-encoded nfs_client_id4 as an argument. +.IP "\fBremove\fR" 4 +.IX Item "remove" +Remove a client record from the database. This command requires a hex-encoded nfs_client_id4 as an argument. +.IP "\fBcheck\fR" 4 +.IX Item "check" +Check to see if a nfs_client_id4 is allowed to reclaim. This command requires a hex-encoded nfs_client_id4 as an argument. +.IP "\fBgracedone\fR" 4 +.IX Item "gracedone" +Remove any unreclaimed client records from the database. This command requires a epoch boot time as an argument. +.SH "EXTERNAL CONFIGURATION" +The directory for stable storage information can be set via the file +.B /etc/nfs.conf +by setting the +.B storagedir +value in the +.B nfsdcltrack +section. For example: +.in +5 +[nfsdcltrack] +.br + storagedir = /shared/nfs/nfsdcltrack +.in -5 +Debuging to syslog can also be enabled by setting "debug = 1" in this file. +.SH "LEGACY TRANSITION MECHANISM" +.IX Header "LEGACY TRANSITION MECHANISM" +The Linux kernel NFSv4 server has historically tracked this information +on stable storage by manipulating information on the filesystem +directly, in the directory to which \fI/proc/fs/nfsd/nfsv4recoverydir\fR +points. If the kernel passes the correct information, then nfsdcltrack +can use it to allow a seamless transition from the old client tracking +scheme to the new one. +.PP +On a \fBcheck\fR operation, if there is no record of the client in the +database, nfsdcltrack will look to see if the \fB\s-1NFSDCLTRACK_LEGACY_RECDIR\s0\fR +environment variable is set. If it is, then it will fetch that value and +see if a directory exists by that name. If it does, then the check +operation will succeed and the directory will be removed. +.PP +On a \fBgracedone\fR operation, nfsdcltrack will look to see if the +\&\fB\s-1NFSDCLTRACK_LEGACY_TOPDIR\s0\fR environment variable is set. If it is, then +it will attempt to clean out that directory prior to exiting. +.PP +Note that this transition is one-way. If the machine subsequently reboots +back into an older kernel that does not support the nfsdcltrack upcall +then the clients will not be able to recover their state. +.SH "NOTES" +.IX Header "NOTES" +This program requires a kernel that supports the nfsdcltrack usermodehelper +upcall. This support was first added to mainline kernels in 3.8. +.SH "AUTHORS" +.IX Header "AUTHORS" +nfsdcltrack was developed by Jeff Layton <jlayton@redhat.com>. diff --git a/utils/nfsdcltrack/sqlite.c b/utils/nfsdcltrack/sqlite.c new file mode 100644 index 0000000..cf0c6a4 --- /dev/null +++ b/utils/nfsdcltrack/sqlite.c @@ -0,0 +1,604 @@ +/* + * Copyright (C) 2011 Red Hat, Jeff Layton <jlayton@redhat.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 + * of the License, or (at your option) any later version. + * + * 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., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +/* + * Explanation: + * + * This file contains the code to manage the sqlite backend database for the + * nfsdcltrack usermodehelper upcall program. + * + * The main database is called main.sqlite and contains the following tables: + * + * parameters: simple key/value pairs for storing database info + * + * clients: an "id" column containing a BLOB with the long-form clientid as + * sent by the client, a "time" column containing a timestamp (in + * epoch seconds) of when the record was last updated, and a + * "has_session" column containing a boolean value indicating + * whether the client has sessions (v4.1+) or not (v4.0). + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif /* HAVE_CONFIG_H */ + +#include <dirent.h> +#include <errno.h> +#include <stdio.h> +#include <stdbool.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <fcntl.h> +#include <inttypes.h> +#include <unistd.h> +#include <sqlite3.h> +#include <linux/limits.h> + +#include "xlog.h" +#include "sqlite.h" + +#define CLTRACK_SQLITE_LATEST_SCHEMA_VERSION 2 + +/* in milliseconds */ +#define CLTRACK_SQLITE_BUSY_TIMEOUT 10000 + +/* private data structures */ + +/* global variables */ + +/* reusable pathname and sql command buffer */ +static char buf[PATH_MAX]; + +/* global database handle */ +static sqlite3 *dbh; + +/* forward declarations */ + +/* make a directory, ignoring EEXIST errors unless it's not a directory */ +static int +mkdir_if_not_exist(const char *dirname) +{ + int ret; + struct stat statbuf; + + ret = mkdir(dirname, S_IRWXU); + if (ret && errno != EEXIST) + return -errno; + + ret = stat(dirname, &statbuf); + if (ret) + return -errno; + + if (!S_ISDIR(statbuf.st_mode)) + ret = -ENOTDIR; + + return ret; +} + +static int +sqlite_query_schema_version(void) +{ + int ret; + sqlite3_stmt *stmt = NULL; + + /* prepare select query */ + ret = sqlite3_prepare_v2(dbh, + "SELECT value FROM parameters WHERE key == \"version\";", + -1, &stmt, NULL); + if (ret != SQLITE_OK) { + xlog(D_GENERAL, "Unable to prepare select statement: %s", + sqlite3_errmsg(dbh)); + ret = 0; + goto out; + } + + /* query schema version */ + ret = sqlite3_step(stmt); + if (ret != SQLITE_ROW) { + xlog(D_GENERAL, "Select statement execution failed: %s", + sqlite3_errmsg(dbh)); + ret = 0; + goto out; + } + + ret = sqlite3_column_int(stmt, 0); +out: + sqlite3_finalize(stmt); + return ret; +} + +static int +sqlite_maindb_update_v1_to_v2(void) +{ + int ret, ret2; + char *err; + + /* begin transaction */ + ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL, + &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to begin transaction: %s", err); + goto rollback; + } + + /* + * Check schema version again. This time, under an exclusive + * transaction to guard against racing DB setup attempts + */ + ret = sqlite_query_schema_version(); + switch (ret) { + case 1: + /* Still at v1 -- do conversion */ + break; + case CLTRACK_SQLITE_LATEST_SCHEMA_VERSION: + /* Someone else raced in and set it up */ + ret = 0; + goto rollback; + default: + /* Something went wrong -- fail! */ + ret = -EINVAL; + goto rollback; + } + + /* create v2 clients table */ + ret = sqlite3_exec(dbh, "ALTER TABLE clients ADD COLUMN " + "has_session INTEGER;", + NULL, NULL, &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to update clients table: %s", err); + goto rollback; + } + + ret = snprintf(buf, sizeof(buf), "UPDATE parameters SET value = %d " + "WHERE key = \"version\";", + CLTRACK_SQLITE_LATEST_SCHEMA_VERSION); + if (ret < 0) { + xlog(L_ERROR, "sprintf failed!"); + goto rollback; + } else if ((size_t)ret >= sizeof(buf)) { + xlog(L_ERROR, "sprintf output too long! (%d chars)", ret); + ret = -EINVAL; + goto rollback; + } + + ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to update schema version: %s", err); + goto rollback; + } + + ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to commit transaction: %s", err); + goto rollback; + } +out: + sqlite3_free(err); + return ret; +rollback: + ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err); + if (ret2 != SQLITE_OK) + xlog(L_ERROR, "Unable to rollback transaction: %s", err); + goto out; +} + +/* + * Start an exclusive transaction and recheck the DB schema version. If it's + * still zero (indicating a new database) then set it up. If that all works, + * then insert schema version into the parameters table and commit the + * transaction. On any error, rollback the transaction. + */ +static int +sqlite_maindb_init_v2(void) +{ + int ret, ret2; + char *err = NULL; + + /* Start a transaction */ + ret = sqlite3_exec(dbh, "BEGIN EXCLUSIVE TRANSACTION;", NULL, NULL, + &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to begin transaction: %s", err); + if (err) + sqlite3_free(err); + return ret; + } + + /* + * Check schema version again. This time, under an exclusive + * transaction to guard against racing DB setup attempts + */ + ret = sqlite_query_schema_version(); + switch (ret) { + case 0: + /* Query failed again -- set up DB */ + break; + case CLTRACK_SQLITE_LATEST_SCHEMA_VERSION: + /* Someone else raced in and set it up */ + ret = 0; + goto rollback; + default: + /* Something went wrong -- fail! */ + ret = -EINVAL; + goto rollback; + } + + ret = sqlite3_exec(dbh, "CREATE TABLE parameters " + "(key TEXT PRIMARY KEY, value TEXT);", + NULL, NULL, &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to create parameter table: %s", err); + goto rollback; + } + + /* create the "clients" table */ + ret = sqlite3_exec(dbh, "CREATE TABLE clients (id BLOB PRIMARY KEY, " + "time INTEGER, has_session INTEGER);", + NULL, NULL, &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to create clients table: %s", err); + goto rollback; + } + + + /* insert version into parameters table */ + ret = snprintf(buf, sizeof(buf), "INSERT OR FAIL INTO parameters " + "values (\"version\", \"%d\");", + CLTRACK_SQLITE_LATEST_SCHEMA_VERSION); + if (ret < 0) { + xlog(L_ERROR, "sprintf failed!"); + goto rollback; + } else if ((size_t)ret >= sizeof(buf)) { + xlog(L_ERROR, "sprintf output too long! (%d chars)", ret); + ret = -EINVAL; + goto rollback; + } + + ret = sqlite3_exec(dbh, (const char *)buf, NULL, NULL, &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to insert into parameter table: %s", err); + goto rollback; + } + + ret = sqlite3_exec(dbh, "COMMIT TRANSACTION;", NULL, NULL, &err); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to commit transaction: %s", err); + goto rollback; + } +out: + sqlite3_free(err); + return ret; + +rollback: + /* Attempt to rollback the transaction */ + ret2 = sqlite3_exec(dbh, "ROLLBACK TRANSACTION;", NULL, NULL, &err); + if (ret2 != SQLITE_OK) + xlog(L_ERROR, "Unable to rollback transaction: %s", err); + goto out; +} + +/* Open the database and set up the database handle for it */ +int +sqlite_prepare_dbh(const char *topdir) +{ + int ret; + + /* Do nothing if the database handle is already set up */ + if (dbh) + return 0; + + ret = snprintf(buf, PATH_MAX - 1, "%s/main.sqlite", topdir); + if (ret < 0) + return ret; + + buf[PATH_MAX - 1] = '\0'; + + /* open a new DB handle */ + ret = sqlite3_open(buf, &dbh); + if (ret != SQLITE_OK) { + /* try to create the dir */ + ret = mkdir_if_not_exist(topdir); + if (ret) + goto out_close; + + /* retry open */ + ret = sqlite3_open(buf, &dbh); + if (ret != SQLITE_OK) + goto out_close; + } + + /* set busy timeout */ + ret = sqlite3_busy_timeout(dbh, CLTRACK_SQLITE_BUSY_TIMEOUT); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "Unable to set sqlite busy timeout: %s", + sqlite3_errmsg(dbh)); + goto out_close; + } + + ret = sqlite_query_schema_version(); + switch (ret) { + case CLTRACK_SQLITE_LATEST_SCHEMA_VERSION: + /* DB is already set up. Do nothing */ + ret = 0; + break; + case 1: + /* Old DB -- update to new schema */ + ret = sqlite_maindb_update_v1_to_v2(); + if (ret) + goto out_close; + break; + case 0: + /* Query failed -- try to set up new DB */ + ret = sqlite_maindb_init_v2(); + if (ret) + goto out_close; + break; + default: + /* Unknown DB version -- downgrade? Fail */ + xlog(L_ERROR, "Unsupported database schema version! " + "Expected %d, got %d.", + CLTRACK_SQLITE_LATEST_SCHEMA_VERSION, ret); + ret = -EINVAL; + goto out_close; + } + + return ret; +out_close: + sqlite3_close(dbh); + dbh = NULL; + return ret; +} + +/* + * Create a client record + * + * Returns a non-zero sqlite error code, or SQLITE_OK (aka 0) + */ +int +sqlite_insert_client(const unsigned char *clname, const size_t namelen, + const bool has_session, const bool zerotime) +{ + int ret; + sqlite3_stmt *stmt = NULL; + + if (zerotime) + ret = sqlite3_prepare_v2(dbh, "INSERT OR REPLACE INTO clients " + "VALUES (?, 0, ?);", -1, &stmt, NULL); + else + ret = sqlite3_prepare_v2(dbh, "INSERT OR REPLACE INTO clients " + "VALUES (?, strftime('%s', 'now'), ?);", -1, + &stmt, NULL); + + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: insert statement prepare failed: %s", + __func__, sqlite3_errmsg(dbh)); + return ret; + } + + ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen, + SQLITE_STATIC); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: bind blob failed: %s", __func__, + sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_bind_int(stmt, 2, (int)has_session); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: bind int failed: %s", __func__, + sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_step(stmt); + if (ret == SQLITE_DONE) + ret = SQLITE_OK; + else + xlog(L_ERROR, "%s: unexpected return code from insert: %s", + __func__, sqlite3_errmsg(dbh)); + +out_err: + xlog(D_GENERAL, "%s: returning %d", __func__, ret); + sqlite3_finalize(stmt); + return ret; +} + +/* Remove a client record */ +int +sqlite_remove_client(const unsigned char *clname, const size_t namelen) +{ + int ret; + sqlite3_stmt *stmt = NULL; + + ret = sqlite3_prepare_v2(dbh, "DELETE FROM clients WHERE id==?", -1, + &stmt, NULL); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: statement prepare failed: %s", + __func__, sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen, + SQLITE_STATIC); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: bind blob failed: %s", __func__, + sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_step(stmt); + if (ret == SQLITE_DONE) + ret = SQLITE_OK; + else + xlog(L_ERROR, "%s: unexpected return code from delete: %d", + __func__, ret); + +out_err: + xlog(D_GENERAL, "%s: returning %d", __func__, ret); + sqlite3_finalize(stmt); + return ret; +} + +/* + * Is the given clname in the clients table? If so, then update its timestamp + * and return success. If the record isn't present, or the update fails, then + * return an error. + */ +int +sqlite_check_client(const unsigned char *clname, const size_t namelen, + const bool has_session) +{ + int ret; + sqlite3_stmt *stmt = NULL; + + ret = sqlite3_prepare_v2(dbh, "SELECT count(*) FROM clients WHERE " + "id==?", -1, &stmt, NULL); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: unable to prepare update statement: %s", + __func__, sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen, + SQLITE_STATIC); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: bind blob failed: %s", + __func__, sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_step(stmt); + if (ret != SQLITE_ROW) { + xlog(L_ERROR, "%s: unexpected return code from select: %d", + __func__, ret); + goto out_err; + } + + ret = sqlite3_column_int(stmt, 0); + xlog(D_GENERAL, "%s: select returned %d rows", __func__, ret); + if (ret != 1) { + ret = -EACCES; + goto out_err; + } + + /* Only update timestamp for v4.0 clients */ + if (has_session) { + ret = SQLITE_OK; + goto out_err; + } + + sqlite3_finalize(stmt); + stmt = NULL; + ret = sqlite3_prepare_v2(dbh, "UPDATE OR FAIL clients SET " + "time=strftime('%s', 'now') WHERE id==?", + -1, &stmt, NULL); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: unable to prepare update statement: %s", + __func__, sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_bind_blob(stmt, 1, (const void *)clname, namelen, + SQLITE_STATIC); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: bind blob failed: %s", + __func__, sqlite3_errmsg(dbh)); + goto out_err; + } + + ret = sqlite3_step(stmt); + if (ret == SQLITE_DONE) + ret = SQLITE_OK; + else + xlog(L_ERROR, "%s: unexpected return code from update: %s", + __func__, sqlite3_errmsg(dbh)); + +out_err: + xlog(D_GENERAL, "%s: returning %d", __func__, ret); + sqlite3_finalize(stmt); + return ret; +} + +/* + * remove any client records that were not reclaimed since grace_start. + */ +int +sqlite_remove_unreclaimed(uint64_t grace_start) +{ + int ret; + char *err = NULL; + + ret = snprintf(buf, sizeof(buf), "DELETE FROM clients WHERE time < %"PRIu64, + grace_start); + if (ret < 0) { + return ret; + } else if ((size_t)ret >= sizeof(buf)) { + ret = -EINVAL; + return ret; + } + + ret = sqlite3_exec(dbh, buf, NULL, NULL, &err); + if (ret != SQLITE_OK) + xlog(L_ERROR, "%s: delete failed: %s", __func__, err); + + xlog(D_GENERAL, "%s: returning %d", __func__, ret); + sqlite3_free(err); + return ret; +} + +/* + * Are there any clients that are possibly still reclaiming? Return a positive + * integer (usually number of clients) if so. If not, then return 0. On any + * error, return non-zero. + */ +int +sqlite_query_reclaiming(const time_t grace_start) +{ + int ret; + sqlite3_stmt *stmt = NULL; + + ret = sqlite3_prepare_v2(dbh, "SELECT count(*) FROM clients WHERE " + "time < ? OR has_session != 1", -1, &stmt, NULL); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: unable to prepare select statement: %s", + __func__, sqlite3_errmsg(dbh)); + return ret; + } + + ret = sqlite3_bind_int64(stmt, 1, (sqlite3_int64)grace_start); + if (ret != SQLITE_OK) { + xlog(L_ERROR, "%s: bind int64 failed: %s", + __func__, sqlite3_errmsg(dbh)); + return ret; + } + + ret = sqlite3_step(stmt); + if (ret != SQLITE_ROW) { + xlog(L_ERROR, "%s: unexpected return code from select: %s", + __func__, sqlite3_errmsg(dbh)); + return ret; + } + + ret = sqlite3_column_int(stmt, 0); + sqlite3_finalize(stmt); + xlog(D_GENERAL, "%s: there are %d clients that have not completed " + "reclaim", __func__, ret); + return ret; +} diff --git a/utils/nfsdcltrack/sqlite.h b/utils/nfsdcltrack/sqlite.h new file mode 100644 index 0000000..ba8cdfa --- /dev/null +++ b/utils/nfsdcltrack/sqlite.h @@ -0,0 +1,32 @@ +/* + * Copyright (C) 2011 Red Hat, Jeff Layton <jlayton@redhat.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 + * of the License, or (at your option) any later version. + * + * 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., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + */ + +#ifndef _SQLITE_H_ +#define _SQLITE_H_ + +int sqlite_prepare_dbh(const char *topdir); +int sqlite_insert_client(const unsigned char *clname, const size_t namelen, + const bool has_session, const bool zerotime); +int sqlite_remove_client(const unsigned char *clname, const size_t namelen); +int sqlite_check_client(const unsigned char *clname, const size_t namelen, + const bool has_session); +int sqlite_remove_unreclaimed(const uint64_t grace_start); +int sqlite_query_reclaiming(const time_t grace_start); + +#endif /* _SQLITE_H */ |