diff options
Diffstat (limited to 'support/misc')
| -rw-r--r-- | support/misc/Makefile.am | 7 | ||||
| -rw-r--r-- | support/misc/Makefile.in | 712 | ||||
| -rw-r--r-- | support/misc/file.c | 115 | ||||
| -rw-r--r-- | support/misc/from_local.c | 268 | ||||
| -rw-r--r-- | support/misc/mountpoint.c | 46 | ||||
| -rw-r--r-- | support/misc/nfsd_path.c | 409 | ||||
| -rw-r--r-- | support/misc/tcpwrapper.c | 270 | ||||
| -rw-r--r-- | support/misc/workqueue.c | 228 | ||||
| -rw-r--r-- | support/misc/xstat.c | 114 |
9 files changed, 2169 insertions, 0 deletions
diff --git a/support/misc/Makefile.am b/support/misc/Makefile.am new file mode 100644 index 0000000..f9993e3 --- /dev/null +++ b/support/misc/Makefile.am @@ -0,0 +1,7 @@ +## Process this file with automake to produce Makefile.in + +noinst_LIBRARIES = libmisc.a +libmisc_a_SOURCES = tcpwrapper.c from_local.c mountpoint.c file.c \ + nfsd_path.c workqueue.c xstat.c + +MAINTAINERCLEANFILES = Makefile.in diff --git a/support/misc/Makefile.in b/support/misc/Makefile.in new file mode 100644 index 0000000..0636156 --- /dev/null +++ b/support/misc/Makefile.in @@ -0,0 +1,712 @@ +# Makefile.in generated by automake 1.16.5 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2021 Free Software Foundation, Inc. + +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +VPATH = @srcdir@ +am__is_gnu_make = { \ + if test -z '$(MAKELEVEL)'; then \ + false; \ + elif test -n '$(MAKE_HOST)'; then \ + true; \ + elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \ + true; \ + else \ + false; \ + fi; \ +} +am__make_running_with_option = \ + case $${target_option-} in \ + ?) ;; \ + *) echo "am__make_running_with_option: internal error: invalid" \ + "target option '$${target_option-}' specified" >&2; \ + exit 1;; \ + esac; \ + has_opt=no; \ + sane_makeflags=$$MAKEFLAGS; \ + if $(am__is_gnu_make); then \ + sane_makeflags=$$MFLAGS; \ + else \ + case $$MAKEFLAGS in \ + *\\[\ \ ]*) \ + bs=\\; \ + sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \ + | sed "s/$$bs$$bs[$$bs $$bs ]*//g"`;; \ + esac; \ + fi; \ + skip_next=no; \ + strip_trailopt () \ + { \ + flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \ + }; \ + for flg in $$sane_makeflags; do \ + test $$skip_next = yes && { skip_next=no; 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\ + cscopelist-am ctags ctags-am distclean distclean-compile \ + distclean-generic distclean-libtool distclean-tags distdir dvi \ + dvi-am html html-am info info-am install install-am \ + install-data install-data-am install-dvi install-dvi-am \ + install-exec install-exec-am install-html install-html-am \ + install-info install-info-am install-man install-pdf \ + install-pdf-am install-ps install-ps-am install-strip \ + installcheck installcheck-am installdirs maintainer-clean \ + maintainer-clean-generic mostlyclean mostlyclean-compile \ + mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \ + tags tags-am uninstall uninstall-am + +.PRECIOUS: Makefile + + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/support/misc/file.c b/support/misc/file.c new file mode 100644 index 0000000..06f6bb2 --- /dev/null +++ b/support/misc/file.c @@ -0,0 +1,115 @@ +/* + * Copyright 2009 Oracle. All rights reserved. + * Copyright 2017 Red Hat, Inc. All rights reserved. + * + * This file is part of nfs-utils. + * + * nfs-utils 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. + * + * nfs-utils 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 nfs-utils. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <sys/stat.h> + +#include <string.h> +#include <libgen.h> +#include <stdio.h> +#include <errno.h> +#include <dirent.h> +#include <stdlib.h> +#include <stdbool.h> +#include <limits.h> + +#include "xlog.h" +#include "misc.h" + +/* + * Returns a dynamically allocated, '\0'-terminated buffer + * containing an appropriate pathname, or NULL if an error + * occurs. Caller must free the returned result with free(3). + */ +__attribute__((__malloc__)) +char * +generic_make_pathname(const char *base, const char *leaf) +{ + size_t size; + char *path; + int len; + + size = strlen(base) + strlen(leaf) + 2; + if (size > PATH_MAX) + return NULL; + + path = malloc(size); + if (path == NULL) + return NULL; + + len = snprintf(path, size, "%s/%s", base, leaf); + if ((len < 0) || ((size_t)len >= size)) { + free(path); + return NULL; + } + + return path; +} + + +/** + * generic_setup_basedir - set up basedir + * @progname: C string containing name of program, for error messages + * @parentdir: C string containing pathname to on-disk state, or NULL + * @base: character buffer to contain the basedir that is set up + * @baselen: size of @base in bytes + * + * This runs before logging is set up, so error messages are directed + * to stderr. + * + * Returns true and sets up our basedir, if @parentdir was valid + * and usable; otherwise false is returned. + */ +_Bool +generic_setup_basedir(const char *progname, const char *parentdir, char *base, + const size_t baselen) +{ + static char buf[PATH_MAX]; + struct stat st; + char *path; + + /* First: test length of name and whether it exists */ + if ((strlen(parentdir) >= baselen) || (strlen(parentdir) >= PATH_MAX)) { + (void)fprintf(stderr, "%s: Directory name too long: %s", + progname, parentdir); + return false; + } + if (lstat(parentdir, &st) == -1) { + (void)fprintf(stderr, "%s: Failed to stat %s: %s", + progname, parentdir, strerror(errno)); + return false; + } + + /* Ensure we have a clean directory pathname */ + strncpy(buf, parentdir, sizeof(buf)-1); + path = dirname(buf); + if (*path == '.') { + (void)fprintf(stderr, "%s: Unusable directory %s", + progname, parentdir); + return false; + } + + xlog(D_CALL, "Using %s as the state directory", parentdir); + strcpy(base, parentdir); + return true; +} diff --git a/support/misc/from_local.c b/support/misc/from_local.c new file mode 100644 index 0000000..e2de969 --- /dev/null +++ b/support/misc/from_local.c @@ -0,0 +1,268 @@ + /* + * Check if an address belongs to the local system. Adapted from: + * + * @(#)pmap_svc.c 1.32 91/03/11 Copyright 1984,1990 Sun Microsystems, Inc. + * @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC. + */ + +/* + * Copyright (c) 2009, Sun Microsystems, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * - Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * - Neither the name of Sun Microsystems, Inc. nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#if 0 +static char sccsid[] = "@(#) from_local.c 1.3 96/05/31 15:52:57"; +#endif + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <sys/types.h> +#include <sys/socket.h> +#include <stdbool.h> +#include <stdio.h> +#include <unistd.h> +#include <netdb.h> +#include <netinet/in.h> +#include <net/if.h> +#include <sys/ioctl.h> +#include <stdlib.h> +#include <string.h> + +#include "sockaddr.h" +#include "tcpwrapper.h" +#include "xlog.h" + +#ifndef TRUE +#define TRUE 1 +#define FALSE 0 +#endif + +#ifdef HAVE_GETIFADDRS + +#include <ifaddrs.h> +#include <time.h> + +/** + * from_local - determine whether request comes from the local system + * @sap: pointer to socket address to check + * + * With virtual hosting, each hardware network interface can have + * multiple network addresses. On such machines the number of machine + * addresses can be surprisingly large. + * + * We also expect the local network configuration to change over time, + * so call getifaddrs(3) more than once, but not too often. + * + * Returns TRUE if the sockaddr contains an address of one of the local + * network interfaces. Otherwise FALSE is returned. + */ +int +from_local(const struct sockaddr *sap) +{ + static struct ifaddrs *ifaddr = NULL; + static time_t last_update = 0; + struct ifaddrs *ifa; + unsigned int count; + time_t now; + + if (time(&now) == ((time_t)-1)) { + xlog(L_ERROR, "%s: time(2): %m", __func__); + + /* If we don't know what time it is, use the + * existing ifaddr list, if one exists */ + now = last_update; + if (ifaddr == NULL) + now++; + } + if (now != last_update) { + xlog(D_GENERAL, "%s: updating local if addr list", __func__); + + if (ifaddr) + freeifaddrs(ifaddr); + + if (getifaddrs(&ifaddr) == -1) { + xlog(L_ERROR, "%s: getifaddrs(3): %m", __func__); + return FALSE; + } + + last_update = now; + } + + count = 0; + for (ifa = ifaddr; ifa; ifa = ifa->ifa_next) { + if ((ifa->ifa_flags & IFF_UP) && + nfs_compare_sockaddr(sap, ifa->ifa_addr)) { + xlog(D_GENERAL, "%s: incoming address matches " + "local interface address", __func__); + return TRUE; + } else + count++; + } + + xlog(D_GENERAL, "%s: checked %u local if addrs; " + "incoming address not found", __func__, count); + return FALSE; +} + +#else /* !HAVE_GETIFADDRS */ + +static int num_local; +static int num_addrs; +static struct in_addr *addrs; + +/* grow_addrs - extend list of local interface addresses */ + +static int grow_addrs(void) +{ + struct in_addr *new_addrs; + int new_num; + + /* + * Keep the previous result if we run out of memory. The system would + * really get hosed if we simply give up. + */ + new_num = (addrs == 0) ? 1 : num_addrs + num_addrs; + new_addrs = (struct in_addr *) malloc(sizeof(*addrs) * new_num); + if (new_addrs == 0) { + xlog_warn("%s: out of memory", __func__); + return (0); + } else { + if (addrs != 0) { + memcpy((char *) new_addrs, (char *) addrs, + sizeof(*addrs) * num_addrs); + free((char *) addrs); + } + num_addrs = new_num; + addrs = new_addrs; + return (1); + } +} + +/* find_local - find all IP addresses for this host */ +static int +find_local(void) +{ + struct ifconf ifc; + struct ifreq ifreq; + struct ifreq *ifr; + struct ifreq *the_end; + int sock; + char buf[BUFSIZ]; + + /* + * Get list of network interfaces. We use a huge buffer to allow for the + * presence of non-IP interfaces. + */ + + if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { + xlog_warn("%s: socket(2): %m", __func__); + return (0); + } + ifc.ifc_len = sizeof(buf); + ifc.ifc_buf = buf; + if (ioctl(sock, SIOCGIFCONF, (char *) &ifc) < 0) { + xlog_warn("%s: ioctl(SIOCGIFCONF): %m", __func__); + (void) close(sock); + return (0); + } + /* Get IP address of each active IP network interface. */ + + the_end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); + num_local = 0; + for (ifr = ifc.ifc_req; ifr < the_end; ifr++) { + if (ifr->ifr_addr.sa_family == AF_INET) { /* IP net interface */ + ifreq = *ifr; + if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) { + xlog_warn("%s: ioctl(SIOCGIFFLAGS): %m", __func__); + } else if (ifreq.ifr_flags & IFF_UP) { /* active interface */ + if (ioctl(sock, SIOCGIFADDR, (char *) &ifreq) < 0) { + xlog_warn("%s: ioctl(SIOCGIFADDR): %m", __func__); + } else { + if (num_local >= num_addrs) + if (grow_addrs() == 0) + break; + addrs[num_local++] = ((struct sockaddr_in *) + & ifreq.ifr_addr)->sin_addr; + } + } + } + /* Support for variable-length addresses. */ +#ifdef HAS_SA_LEN + ifr = (struct ifreq *) ((caddr_t) ifr + + ifr->ifr_addr.sa_len - sizeof(struct sockaddr)); +#endif + } + (void) close(sock); + return (num_local); +} + +/** + * from_local - determine whether request comes from the local system + * @sap: pointer to socket address to check + * + * With virtual hosting, each hardware network interface can have + * multiple network addresses. On such machines the number of machine + * addresses can be surprisingly large. + * + * Returns TRUE if the sockaddr contains an address of one of the local + * network interfaces. Otherwise FALSE is returned. + */ +int +from_local(const struct sockaddr *sap) +{ + const struct sockaddr_in *addr = (const struct sockaddr_in *)sap; + int i; + + if (sap->sa_family != AF_INET) + return (FALSE); + + if (addrs == 0 && find_local() == 0) + xlog(L_ERROR, "Cannot find any active local network interfaces"); + + for (i = 0; i < num_local; i++) { + if (memcmp((char *) &(addr->sin_addr), (char *) &(addrs[i]), + sizeof(struct in_addr)) == 0) + return (TRUE); + } + return (FALSE); +} + +#ifdef TEST + +int main(void) +{ + int i; + + find_local(); + for (i = 0; i < num_local; i++) + printf("%s\n", inet_ntoa(addrs[i])); +} + +#endif /* TEST */ + +#endif /* !HAVE_GETIFADDRS */ diff --git a/support/misc/mountpoint.c b/support/misc/mountpoint.c new file mode 100644 index 0000000..14d6731 --- /dev/null +++ b/support/misc/mountpoint.c @@ -0,0 +1,46 @@ + +/* + * check if a given path is a mountpoint + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <string.h> +#include "xcommon.h" +#include <sys/stat.h> +#include "misc.h" + +int +check_is_mountpoint(const char *path, int (mystat)(const char *, struct stat *)) +{ + if (!mystat) + mystat = lstat; + /* Check if 'path' is a current mountpoint. + * Possibly we should also check it is the mountpoint of the + * filesystem holding the target directory, but there doesn't + * seem a lot of point. + * + * We deem it to be a mountpoint if appending a ".." gives a different + * device or the same inode number. + */ + char *dotdot; + struct stat stb, pstb; + int rv; + + dotdot = xmalloc(strlen(path)+4); + + strcat(strcpy(dotdot, path), "/.."); + if (mystat(path, &stb) != 0 || + mystat(dotdot, &pstb) != 0) + rv = 0; + else + if (stb.st_dev != pstb.st_dev || + stb.st_ino == pstb.st_ino) + rv = 1; + else + rv = 0; + free(dotdot); + return rv; +} diff --git a/support/misc/nfsd_path.c b/support/misc/nfsd_path.c new file mode 100644 index 0000000..c3dea4f --- /dev/null +++ b/support/misc/nfsd_path.c @@ -0,0 +1,409 @@ +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <errno.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <sys/vfs.h> +#include <fcntl.h> +#include <limits.h> +#include <stdlib.h> +#include <unistd.h> + +#include "conffile.h" +#include "xmalloc.h" +#include "xlog.h" +#include "xstat.h" +#include "nfslib.h" +#include "nfsd_path.h" +#include "workqueue.h" + +static struct xthread_workqueue *nfsd_wq; + +static int +nfsd_path_isslash(const char *path) +{ + return path[0] == '/' && path[1] == '/'; +} + +static int +nfsd_path_isdot(const char *path) +{ + return path[0] == '.' && path[1] == '/'; +} + +static const char * +nfsd_path_strip(const char *path) +{ + if (!path || *path == '\0') + goto out; + for (;;) { + if (nfsd_path_isslash(path)) { + path++; + continue; + } + if (nfsd_path_isdot(path)) { + path += 2; + continue; + } + break; + } +out: + return path; +} + +const char * +nfsd_path_nfsd_rootdir(void) +{ + const char *rootdir; + + rootdir = nfsd_path_strip(conf_get_str("exports", "rootdir")); + if (!rootdir || rootdir[0] == '\0') + return NULL; + if (rootdir[0] == '/' && rootdir[1] == '\0') + return NULL; + return rootdir; +} + +char * +nfsd_path_strip_root(char *pathname) +{ + char buffer[PATH_MAX]; + const char *dir = nfsd_path_nfsd_rootdir(); + + if (!dir) + goto out; + + if (realpath(dir, buffer)) + return strstr(pathname, buffer) == pathname ? + pathname + strlen(buffer) : NULL; + + xlog(D_GENERAL, "%s: failed to resolve path %s: %m", __func__, dir); +out: + return pathname; +} + +char * +nfsd_path_prepend_dir(const char *dir, const char *pathname) +{ + size_t len, dirlen; + char *ret; + + dirlen = strlen(dir); + while (dirlen > 0 && dir[dirlen - 1] == '/') + dirlen--; + if (!dirlen) + return NULL; + while (pathname[0] == '/') + pathname++; + len = dirlen + strlen(pathname) + 1; + ret = xmalloc(len + 1); + snprintf(ret, len+1, "%.*s/%s", (int)dirlen, dir, pathname); + return ret; +} + +static void +nfsd_setup_workqueue(void) +{ + const char *rootdir = nfsd_path_nfsd_rootdir(); + + if (!rootdir) + return; + + nfsd_wq = xthread_workqueue_alloc(); + if (!nfsd_wq) + return; + xthread_workqueue_chroot(nfsd_wq, rootdir); +} + +void +nfsd_path_init(void) +{ + nfsd_setup_workqueue(); +} + +struct nfsd_stat_data { + const char *pathname; + struct stat *statbuf; + int ret; + int err; +}; + +static void +nfsd_statfunc(void *data) +{ + struct nfsd_stat_data *d = data; + + d->ret = xstat(d->pathname, d->statbuf); + if (d->ret < 0) + d->err = errno; +} + +static void +nfsd_lstatfunc(void *data) +{ + struct nfsd_stat_data *d = data; + + d->ret = xlstat(d->pathname, d->statbuf); + if (d->ret < 0) + d->err = errno; +} + +static int +nfsd_run_stat(struct xthread_workqueue *wq, + void (*func)(void *), + const char *pathname, + struct stat *statbuf) +{ + struct nfsd_stat_data data = { + pathname, + statbuf, + 0, + 0 + }; + xthread_work_run_sync(wq, func, &data); + if (data.ret < 0) + errno = data.err; + return data.ret; +} + +int +nfsd_path_stat(const char *pathname, struct stat *statbuf) +{ + if (!nfsd_wq) + return xstat(pathname, statbuf); + return nfsd_run_stat(nfsd_wq, nfsd_statfunc, pathname, statbuf); +} + +int +nfsd_path_lstat(const char *pathname, struct stat *statbuf) +{ + if (!nfsd_wq) + return xlstat(pathname, statbuf); + return nfsd_run_stat(nfsd_wq, nfsd_lstatfunc, pathname, statbuf); +} + +struct nfsd_statfs_data { + const char *pathname; + struct statfs *statbuf; + int ret; + int err; +}; + +static void +nfsd_statfsfunc(void *data) +{ + struct nfsd_statfs_data *d = data; + + d->ret = statfs(d->pathname, d->statbuf); + if (d->ret < 0) + d->err = errno; +} + +static int +nfsd_run_statfs(struct xthread_workqueue *wq, + const char *pathname, + struct statfs *statbuf) +{ + struct nfsd_statfs_data data = { + pathname, + statbuf, + 0, + 0 + }; + xthread_work_run_sync(wq, nfsd_statfsfunc, &data); + if (data.ret < 0) + errno = data.err; + return data.ret; +} + +int +nfsd_path_statfs(const char *pathname, struct statfs *statbuf) +{ + if (!nfsd_wq) + return statfs(pathname, statbuf); + return nfsd_run_statfs(nfsd_wq, pathname, statbuf); +} + +struct nfsd_realpath_data { + const char *pathname; + char *resolved; + int err; +}; + +static void +nfsd_realpathfunc(void *data) +{ + struct nfsd_realpath_data *d = data; + + d->resolved = realpath(d->pathname, d->resolved); + if (!d->resolved) + d->err = errno; +} + +char * +nfsd_realpath(const char *path, char *resolved_path) +{ + struct nfsd_realpath_data data = { + path, + resolved_path, + 0 + }; + + if (!nfsd_wq) + return realpath(path, resolved_path); + + xthread_work_run_sync(nfsd_wq, nfsd_realpathfunc, &data); + if (!data.resolved) + errno = data.err; + return data.resolved; +} + +struct nfsd_read_data { + int fd; + char *buf; + size_t len; + ssize_t ret; + int err; +}; + +static void +nfsd_readfunc(void *data) +{ + struct nfsd_read_data *d = data; + + d->ret = read(d->fd, d->buf, d->len); + if (d->ret < 0) + d->err = errno; +} + +static ssize_t +nfsd_run_read(struct xthread_workqueue *wq, int fd, char *buf, size_t len) +{ + struct nfsd_read_data data = { + fd, + buf, + len, + 0, + 0 + }; + xthread_work_run_sync(wq, nfsd_readfunc, &data); + if (data.ret < 0) + errno = data.err; + return data.ret; +} + +ssize_t +nfsd_path_read(int fd, char *buf, size_t len) +{ + if (!nfsd_wq) + return read(fd, buf, len); + return nfsd_run_read(nfsd_wq, fd, buf, len); +} + +struct nfsd_write_data { + int fd; + const char *buf; + size_t len; + ssize_t ret; + int err; +}; + +static void +nfsd_writefunc(void *data) +{ + struct nfsd_write_data *d = data; + + d->ret = write(d->fd, d->buf, d->len); + if (d->ret < 0) + d->err = errno; +} + +static ssize_t +nfsd_run_write(struct xthread_workqueue *wq, int fd, const char *buf, size_t len) +{ + struct nfsd_write_data data = { + fd, + buf, + len, + 0, + 0 + }; + xthread_work_run_sync(wq, nfsd_writefunc, &data); + if (data.ret < 0) + errno = data.err; + return data.ret; +} + +ssize_t +nfsd_path_write(int fd, const char *buf, size_t len) +{ + if (!nfsd_wq) + return write(fd, buf, len); + return nfsd_run_write(nfsd_wq, fd, buf, len); +} + +#if defined(HAVE_NAME_TO_HANDLE_AT) +struct nfsd_handle_data { + int fd; + const char *path; + struct file_handle *fh; + int *mount_id; + int flags; + int ret; + int err; +}; + +static void +nfsd_name_to_handle_func(void *data) +{ + struct nfsd_handle_data *d = data; + + d->ret = name_to_handle_at(d->fd, d->path, + d->fh, d->mount_id, d->flags); + if (d->ret < 0) + d->err = errno; +} + +static int +nfsd_run_name_to_handle_at(struct xthread_workqueue *wq, + int fd, const char *path, struct file_handle *fh, + int *mount_id, int flags) +{ + struct nfsd_handle_data data = { + fd, + path, + fh, + mount_id, + flags, + 0, + 0 + }; + + xthread_work_run_sync(wq, nfsd_name_to_handle_func, &data); + if (data.ret < 0) + errno = data.err; + return data.ret; +} + +int +nfsd_name_to_handle_at(int fd, const char *path, struct file_handle *fh, + int *mount_id, int flags) +{ + if (!nfsd_wq) + return name_to_handle_at(fd, path, fh, mount_id, flags); + + return nfsd_run_name_to_handle_at(nfsd_wq, fd, path, fh, + mount_id, flags); +} +#else +int +nfsd_name_to_handle_at(int UNUSED(fd), const char *UNUSED(path), + struct file_handle *UNUSED(fh), + int *UNUSED(mount_id), int UNUSED(flags)) +{ + errno = ENOSYS; + return -1; +} +#endif diff --git a/support/misc/tcpwrapper.c b/support/misc/tcpwrapper.c new file mode 100644 index 0000000..3128053 --- /dev/null +++ b/support/misc/tcpwrapper.c @@ -0,0 +1,270 @@ +/* This is copied from portmap 4.0-29 in RedHat. */ + + /* + * pmap_check - additional portmap security. + * + * Always reject non-local requests to update the portmapper tables. + * + * Refuse to forward mount requests to the nfs mount daemon. Otherwise, the + * requests would appear to come from the local system, and nfs export + * restrictions could be bypassed. + * + * Refuse to forward requests to the nfsd process. + * + * Refuse to forward requests to NIS (YP) daemons; The only exception is the + * YPPROC_DOMAIN_NONACK broadcast rpc call that is used to establish initial + * contact with the NIS server. + * + * Always allocate an unprivileged port when forwarding a request. + * + * If compiled with -DCHECK_PORT, require that requests to register or + * unregister a privileged port come from a privileged port. This makes it + * more difficult to replace a critical service by a trojan. + * + * If compiled with -DHOSTS_ACCESS, reject requests from hosts that are not + * authorized by the /etc/hosts.{allow,deny} files. The local system is + * always treated as an authorized host. The access control tables are never + * consulted for requests from the local system, and are always consulted + * for requests from other hosts. + * + * Author: Wietse Venema (wietse@wzv.win.tue.nl), dept. of Mathematics and + * Computing Science, Eindhoven University of Technology, The Netherlands. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#ifdef HAVE_LIBWRAP +#include <unistd.h> +#include <string.h> +#include <rpc/rpc.h> +#include <rpc/pmap_prot.h> +#include <netdb.h> +#include <pwd.h> +#include <sys/types.h> +#include <sys/signal.h> +#include <sys/queue.h> +#include <sys/stat.h> +#include <tcpd.h> + +#include "sockaddr.h" +#include "tcpwrapper.h" +#include "xlog.h" + +#ifdef SYSV40 +#include <netinet/in.h> +#include <rpc/rpcent.h> +#endif /* SYSV40 */ + +#define ALLOW 1 +#define DENY 0 + +#ifdef IPV6_SUPPORTED +static void +present_address(const struct sockaddr *sap, char *buf, const size_t buflen) +{ + const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; + const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sap; + socklen_t len = (socklen_t)buflen; + + switch (sap->sa_family) { + case AF_INET: + if (inet_ntop(AF_INET, &sin->sin_addr, buf, len) != 0) + return; + break; + case AF_INET6: + if (inet_ntop(AF_INET6, &sin6->sin6_addr, buf, len) != 0) + return; + } + + memset(buf, 0, buflen); + strncpy(buf, "unrecognized caller", buflen); +} +#else /* !IPV6_SUPPORTED */ +static void +present_address(const struct sockaddr *sap, char *buf, const size_t buflen) +{ + const struct sockaddr_in *sin = (const struct sockaddr_in *)sap; + socklen_t len = (socklen_t)buflen; + + if (sap->sa_family == AF_INET) + if (inet_ntop(AF_INET, &sin->sin_addr, buf, len) != 0) + return; + + memset(buf, 0, buflen); + strncpy(buf, "unrecognized caller", (size_t)buflen); +} +#endif /* !IPV6_SUPPORTED */ + +typedef struct _haccess_t { + TAILQ_ENTRY(_haccess_t) list; + int allowed; + union nfs_sockaddr address; +} haccess_t; + +#define HASH_TABLE_SIZE 1021 +typedef struct _hash_head { + TAILQ_HEAD(host_list, _haccess_t) h_head; +} hash_head; + +static hash_head haccess_tbl[HASH_TABLE_SIZE]; + +static unsigned long +strtoint(const char *str) +{ + unsigned long i, n = 0; + size_t len = strlen(str); + + for (i = 0; i < len; i++) + n += (unsigned char)str[i] * i; + + return n; +} + +static unsigned int +hashint(const unsigned long num) +{ + return (unsigned int)(num % HASH_TABLE_SIZE); +} + +static unsigned int +HASH(const char *addr, const unsigned long program) +{ + return hashint(strtoint(addr) + program); +} + +static void +haccess_add(const struct sockaddr *sap, const char *address, + const unsigned long program, const int allowed) +{ + hash_head *head; + haccess_t *hptr; + unsigned int hash; + + hptr = (haccess_t *)malloc(sizeof(haccess_t)); + if (hptr == NULL) + return; + + hash = HASH(address, program); + head = &(haccess_tbl[hash]); + + hptr->allowed = allowed; + memcpy(&hptr->address, sap, (size_t)nfs_sockaddr_length(sap)); + + if (TAILQ_EMPTY(&head->h_head)) + TAILQ_INSERT_HEAD(&head->h_head, hptr, list); + else + TAILQ_INSERT_TAIL(&head->h_head, hptr, list); +} + +static haccess_t * +haccess_lookup(const struct sockaddr *sap, const char *address, + const unsigned long program) +{ + hash_head *head; + haccess_t *hptr; + unsigned int hash; + + hash = HASH(address, program); + head = &(haccess_tbl[hash]); + + TAILQ_FOREACH(hptr, &head->h_head, list) { + if (nfs_compare_sockaddr(&hptr->address.sa, sap)) + return hptr; + } + return NULL; +} + +static void +logit(const char *address) +{ + xlog_warn("connect from %s denied: request from unauthorized host", + address); +} + +static int +good_client(char *name, struct sockaddr *sap) +{ + struct request_info req; + + request_init(&req, RQ_DAEMON, name, RQ_CLIENT_SIN, sap, 0); + sock_methods(&req); + + if (hosts_access(&req)) + return ALLOW; + + return DENY; +} + +static int +check_files(void) +{ + static time_t allow_mtime, deny_mtime; + struct stat astat, dstat; + int changed = 0; + + if (stat("/etc/hosts.allow", &astat) < 0) + astat.st_mtime = 0; + if (stat("/etc/hosts.deny", &dstat) < 0) + dstat.st_mtime = 0; + + if(!astat.st_mtime || !dstat.st_mtime) + return changed; + + if (astat.st_mtime != allow_mtime) + changed = 1; + else if (dstat.st_mtime != deny_mtime) + changed = 1; + + allow_mtime = astat.st_mtime; + deny_mtime = dstat.st_mtime; + + return changed; +} + +/** + * check_default - additional checks for NULL, DUMP, GETPORT and unknown + * @name: pointer to '\0'-terminated ASCII string containing name of the + * daemon requesting the access check + * @sap: pointer to sockaddr containing network address of caller + * @program: RPC program number caller is attempting to access + * + * Returns TRUE if the caller is allowed access; otherwise FALSE is returned. + */ +int +check_default(char *name, struct sockaddr *sap, const unsigned long program) +{ + haccess_t *acc = NULL; + int changed = check_files(); + char buf[INET6_ADDRSTRLEN]; + + present_address(sap, buf, sizeof(buf)); + + acc = haccess_lookup(sap, buf, program); + if (acc != NULL && changed == 0) { + xlog(D_GENERAL, "%s: access by %s %s (cached)", __func__, + buf, acc->allowed ? "ALLOWED" : "DENIED"); + return acc->allowed; + } + + if (!(from_local(sap) || good_client(name, sap))) { + logit(buf); + if (acc != NULL) + acc->allowed = FALSE; + else + haccess_add(sap, buf, program, FALSE); + xlog(D_GENERAL, "%s: access by %s DENIED", __func__, buf); + return (FALSE); + } + + if (acc != NULL) + acc->allowed = TRUE; + else + haccess_add(sap, buf, program, TRUE); + xlog(D_GENERAL, "%s: access by %s ALLOWED", __func__, buf); + + return (TRUE); +} + +#endif /* HAVE_LIBWRAP */ diff --git a/support/misc/workqueue.c b/support/misc/workqueue.c new file mode 100644 index 0000000..8043268 --- /dev/null +++ b/support/misc/workqueue.c @@ -0,0 +1,228 @@ +#include <stdlib.h> +#include <unistd.h> + +#include "config.h" +#include "workqueue.h" +#include "xlog.h" + +#if defined(HAVE_SCHED_H) && defined(HAVE_LIBPTHREAD) && defined(HAVE_UNSHARE) +#include <sched.h> +#include <pthread.h> + +struct xwork_struct { + struct xwork_struct *next; + void (*fn)(void *); + void *data; +}; + +struct xwork_queue { + struct xwork_struct *head; + struct xwork_struct **tail; + + unsigned char shutdown : 1; +}; + +static void xwork_queue_init(struct xwork_queue *queue) +{ + queue->head = NULL; + queue->tail = &queue->head; + queue->shutdown = 0; +} + +static void xwork_enqueue(struct xwork_queue *queue, + struct xwork_struct *entry) +{ + entry->next = NULL; + *queue->tail = entry; + queue->tail = &entry->next; +} + +static struct xwork_struct *xwork_dequeue(struct xwork_queue *queue) +{ + struct xwork_struct *entry = NULL; + if (queue->head) { + entry = queue->head; + queue->head = entry->next; + if (!queue->head) + queue->tail = &queue->head; + } + return entry; +} + +struct xthread_work { + struct xwork_struct work; + + pthread_cond_t cond; +}; + +struct xthread_workqueue { + struct xwork_queue queue; + + pthread_mutex_t mutex; + pthread_cond_t cond; +}; + +static void xthread_workqueue_init(struct xthread_workqueue *wq) +{ + xwork_queue_init(&wq->queue); + pthread_mutex_init(&wq->mutex, NULL); + pthread_cond_init(&wq->cond, NULL); +} + +static void xthread_workqueue_fini(struct xthread_workqueue *wq) +{ + pthread_cond_destroy(&wq->cond); + pthread_mutex_destroy(&wq->mutex); +} + +static int xthread_work_enqueue(struct xthread_workqueue *wq, + struct xthread_work *work) +{ + xwork_enqueue(&wq->queue, &work->work); + pthread_cond_signal(&wq->cond); + return 0; +} + +static struct xthread_work *xthread_work_dequeue(struct xthread_workqueue *wq) +{ + return (struct xthread_work *)xwork_dequeue(&wq->queue); +} + +static void xthread_workqueue_do_work(struct xthread_workqueue *wq) +{ + struct xthread_work *work; + + pthread_mutex_lock(&wq->mutex); + /* Signal the caller that we're up and running */ + pthread_cond_signal(&wq->cond); + for (;;) { + work = xthread_work_dequeue(wq); + if (work) { + work->work.fn(work->work.data); + pthread_cond_signal(&work->cond); + continue; + } + if (wq->queue.shutdown) + break; + pthread_cond_wait(&wq->cond, &wq->mutex); + } + pthread_mutex_unlock(&wq->mutex); +} + +void xthread_workqueue_shutdown(struct xthread_workqueue *wq) +{ + pthread_mutex_lock(&wq->mutex); + wq->queue.shutdown = 1; + pthread_cond_signal(&wq->cond); + pthread_mutex_unlock(&wq->mutex); +} + +static void xthread_workqueue_free(struct xthread_workqueue *wq) +{ + xthread_workqueue_fini(wq); + free(wq); +} + +static void xthread_workqueue_cleanup(void *data) +{ + xthread_workqueue_free(data); +} + +static void *xthread_workqueue_worker(void *data) +{ + pthread_cleanup_push(xthread_workqueue_cleanup, data); + xthread_workqueue_do_work(data); + pthread_cleanup_pop(1); + return NULL; +} + +struct xthread_workqueue *xthread_workqueue_alloc(void) +{ + struct xthread_workqueue *ret; + pthread_t thread; + + ret = malloc(sizeof(*ret)); + if (ret) { + xthread_workqueue_init(ret); + + pthread_mutex_lock(&ret->mutex); + if (pthread_create(&thread, NULL, + xthread_workqueue_worker, + ret) == 0) { + /* Wait for thread to start */ + pthread_cond_wait(&ret->cond, &ret->mutex); + pthread_mutex_unlock(&ret->mutex); + return ret; + } + pthread_mutex_unlock(&ret->mutex); + xthread_workqueue_free(ret); + ret = NULL; + } + return NULL; +} + +void xthread_work_run_sync(struct xthread_workqueue *wq, + void (*fn)(void *), void *data) +{ + struct xthread_work work = { + { + NULL, + fn, + data + }, + PTHREAD_COND_INITIALIZER, + }; + pthread_mutex_lock(&wq->mutex); + xthread_work_enqueue(wq, &work); + pthread_cond_wait(&work.cond, &wq->mutex); + pthread_mutex_unlock(&wq->mutex); + pthread_cond_destroy(&work.cond); +} + +static void xthread_workqueue_do_chroot(void *data) +{ + const char *path = data; + + if (unshare(CLONE_FS) != 0) { + xlog_err("unshare() failed: %m"); + return; + } + if (chroot(path) != 0) + xlog_err("chroot(%s) failed: %m", path); +} + +void xthread_workqueue_chroot(struct xthread_workqueue *wq, + const char *path) +{ + xthread_work_run_sync(wq, xthread_workqueue_do_chroot, (void *)path); +} + +#else + +struct xthread_workqueue { +}; + +static struct xthread_workqueue ret; + +struct xthread_workqueue *xthread_workqueue_alloc(void) +{ + return &ret; +} + +void xthread_workqueue_shutdown(struct xthread_workqueue *wq) +{ +} + +void xthread_work_run_sync(struct xthread_workqueue *wq, + void (*fn)(void *), void *data) +{ + fn(data); +} + +void xthread_workqueue_chroot(struct xthread_workqueue *wq, + const char *path) +{ + xlog_err("Unable to run as chroot"); +} + +#endif /* defined(HAVE_SCHED_H) && defined(HAVE_LIBPTHREAD) && defined(HAVE_UNSHARE) */ diff --git a/support/misc/xstat.c b/support/misc/xstat.c new file mode 100644 index 0000000..6f751f7 --- /dev/null +++ b/support/misc/xstat.c @@ -0,0 +1,114 @@ +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <errno.h> +#include <sys/types.h> +#include <fcntl.h> +#include <sys/stat.h> +#include <sys/sysmacros.h> +#include <unistd.h> + +#include "nfslib.h" +#include "xstat.h" + +#ifdef HAVE_FSTATAT +#ifdef HAVE_STATX + +static void +statx_copy(struct stat *stbuf, const struct statx *stxbuf) +{ + stbuf->st_dev = makedev(stxbuf->stx_dev_major, stxbuf->stx_dev_minor); + stbuf->st_ino = stxbuf->stx_ino; + stbuf->st_mode = stxbuf->stx_mode; + stbuf->st_nlink = stxbuf->stx_nlink; + stbuf->st_uid = stxbuf->stx_uid; + stbuf->st_gid = stxbuf->stx_gid; + stbuf->st_rdev = makedev(stxbuf->stx_rdev_major, stxbuf->stx_rdev_minor); + stbuf->st_size = stxbuf->stx_size; + stbuf->st_blksize = stxbuf->stx_blksize; + stbuf->st_blocks = stxbuf->stx_blocks; + stbuf->st_atim.tv_sec = stxbuf->stx_atime.tv_sec; + stbuf->st_atim.tv_nsec = stxbuf->stx_atime.tv_nsec; + stbuf->st_mtim.tv_sec = stxbuf->stx_mtime.tv_sec; + stbuf->st_mtim.tv_nsec = stxbuf->stx_mtime.tv_nsec; + stbuf->st_ctim.tv_sec = stxbuf->stx_ctime.tv_sec; + stbuf->st_ctim.tv_nsec = stxbuf->stx_ctime.tv_nsec; +} + +static int +statx_do_stat(int fd, const char *pathname, struct stat *statbuf, int flags) +{ + static int statx_supported = 1; + struct statx stxbuf; + int ret; + + if (statx_supported) { + ret = statx(fd, pathname, flags, + STATX_BASIC_STATS, + &stxbuf); + if (ret == 0) { + statx_copy(statbuf, &stxbuf); + return 0; + } + /* glibc emulation doesn't support AT_STATX_DONT_SYNC */ + if (errno == EINVAL) + errno = ENOSYS; + if (errno == ENOSYS) + statx_supported = 0; + } else + errno = ENOSYS; + return -1; +} + +static int +statx_stat_nosync(int fd, const char *pathname, struct stat *statbuf, int flags) +{ + return statx_do_stat(fd, pathname, statbuf, flags | AT_STATX_DONT_SYNC); +} + +#else + +static int +statx_stat_nosync(int UNUSED(fd), const char *UNUSED(pathname), struct stat *UNUSED(statbuf), int UNUSED(flags)) +{ + errno = ENOSYS; + return -1; +} + +#endif /* HAVE_STATX */ + +int xlstat(const char *pathname, struct stat *statbuf) +{ + if (statx_stat_nosync(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT| + AT_SYMLINK_NOFOLLOW) == 0) + return 0; + else if (errno != ENOSYS) + return -1; + errno = 0; + return fstatat(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT | + AT_SYMLINK_NOFOLLOW); +} + +int xstat(const char *pathname, struct stat *statbuf) +{ + if (statx_stat_nosync(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT) == 0) + return 0; + else if (errno != ENOSYS) + return -1; + errno = 0; + return fstatat(AT_FDCWD, pathname, statbuf, AT_NO_AUTOMOUNT); +} + +#else + +int xlstat(const char *pathname, struct stat *statbuf) +{ + return lstat(pathname, statbuf); +} + +int xstat(const char *pathname, struct stat *statbuf) +{ + return stat(pathname, statbuf); +} +#endif |