diff options
Diffstat (limited to 'cddl/compat/opensolaris/misc/fsshare.c')
| -rw-r--r-- | cddl/compat/opensolaris/misc/fsshare.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/cddl/compat/opensolaris/misc/fsshare.c b/cddl/compat/opensolaris/misc/fsshare.c new file mode 100644 index 000000000000..c3247f91fec4 --- /dev/null +++ b/cddl/compat/opensolaris/misc/fsshare.c @@ -0,0 +1,262 @@ +/*- + * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> + +#include <assert.h> +#include <errno.h> +#include <fcntl.h> +#include <fsshare.h> +#include <libutil.h> +#include <pathnames.h> /* _PATH_MOUNTDPID */ +#include <signal.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#define FILE_HEADER "# !!! DO NOT EDIT THIS FILE MANUALLY !!!\n\n" +#define OPTSSIZE 1024 +#define MAXLINESIZE (PATH_MAX + OPTSSIZE) + +static void +restart_mountd(void) +{ + struct pidfh *pfh; + pid_t mountdpid; + + pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid); + if (pfh != NULL) { + /* Mountd is not running. */ + pidfile_remove(pfh); + return; + } + if (errno != EEXIST) { + /* Cannot open pidfile for some reason. */ + return; + } + /* We have mountd(8) PID in mountdpid varible. */ + kill(mountdpid, SIGHUP); +} + +/* + * Read one line from a file. Skip comments, empty lines and a line with a + * mountpoint specified in the 'skip' argument. + */ +static char * +getline(FILE *fd, const char *skip) +{ + static char line[MAXLINESIZE]; + size_t len, skiplen; + char *s, last; + + if (skip != NULL) + skiplen = strlen(skip); + for (;;) { + s = fgets(line, sizeof(line), fd); + if (s == NULL) + return (NULL); + /* Skip empty lines and comments. */ + if (line[0] == '\n' || line[0] == '#') + continue; + len = strlen(line); + if (line[len - 1] == '\n') + line[len - 1] = '\0'; + last = line[skiplen]; + /* Skip the given mountpoint. */ + if (skip != NULL && strncmp(skip, line, skiplen) == 0 && + (last == '\t' || last == ' ' || last == '\0')) { + continue; + } + break; + } + return (line); +} + +/* + * Function translate options to a format acceptable by exports(5), eg. + * + * -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 freefall.freebsd.org 69.147.83.54 + * + * Accepted input formats: + * + * ro,network=192.168.0.0,mask=255.255.255.0,maproot=0,freefall.freebsd.org + * ro network=192.168.0.0 mask=255.255.255.0 maproot=0 freefall.freebsd.org + * -ro,-network=192.168.0.0,-mask=255.255.255.0,-maproot=0,freefall.freebsd.org + * -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 freefall.freebsd.org + * + * Recognized keywords: + * + * ro, maproot, mapall, mask, network, sec, alldirs, public, webnfs, index, quiet + * + */ +static const char *known_opts[] = { "ro", "maproot", "mapall", "mask", + "network", "sec", "alldirs", "public", "webnfs", "index", "quiet", NULL }; +static char * +translate_opts(const char *shareopts) +{ + static char newopts[OPTSSIZE]; + char oldopts[OPTSSIZE]; + char *o, *s = NULL; + unsigned int i; + size_t len; + + strlcpy(oldopts, shareopts, sizeof(oldopts)); + newopts[0] = '\0'; + s = oldopts; + while ((o = strsep(&s, "-, ")) != NULL) { + if (o[0] == '\0') + continue; + for (i = 0; known_opts[i] != NULL; i++) { + len = strlen(known_opts[i]); + if (strncmp(known_opts[i], o, len) == 0 && + (o[len] == '\0' || o[len] == '=')) { + strlcat(newopts, "-", sizeof(newopts)); + break; + } + } + strlcat(newopts, o, sizeof(newopts)); + strlcat(newopts, " ", sizeof(newopts)); + } + return (newopts); +} + +static int +fsshare_main(const char *file, const char *mountpoint, const char *shareopts, + int share) +{ + char tmpfile[PATH_MAX]; + char *line; + FILE *newfd, *oldfd; + int fd, error; + + newfd = oldfd = NULL; + error = 0; + + /* + * Create temporary file in the same directory, so we can atomically + * rename it. + */ + if (strlcpy(tmpfile, file, sizeof(tmpfile)) >= sizeof(tmpfile)) + return (ENAMETOOLONG); + if (strlcat(tmpfile, ".XXXXXXXX", sizeof(tmpfile)) >= sizeof(tmpfile)) + return (ENAMETOOLONG); + fd = mkstemp(tmpfile); + if (fd == -1) + return (errno); + /* + * File name is random, so we don't really need file lock now, but it + * will be needed after rename(2). + */ + error = flock(fd, LOCK_EX); + assert(error == 0 || (error == -1 && errno == EOPNOTSUPP)); + newfd = fdopen(fd, "r+"); + assert(newfd != NULL); + /* Open old exports file. */ + oldfd = fopen(file, "r"); + if (oldfd == NULL) { + if (share) { + if (errno != ENOENT) { + error = errno; + goto out; + } + } else { + /* If there is no exports file, ignore the error. */ + if (errno == ENOENT) + errno = 0; + error = errno; + goto out; + } + } else { + error = flock(fileno(oldfd), LOCK_EX); + assert(error == 0 || (error == -1 && errno == EOPNOTSUPP)); + error = 0; + } + + /* Place big, fat warning at the begining of the file. */ + fprintf(newfd, "%s", FILE_HEADER); + while (oldfd != NULL && (line = getline(oldfd, mountpoint)) != NULL) + fprintf(newfd, "%s\n", line); + if (oldfd != NULL && ferror(oldfd) != 0) { + error = ferror(oldfd); + goto out; + } + if (ferror(newfd) != 0) { + error = ferror(newfd); + goto out; + } + if (share) { + fprintf(newfd, "%s\t%s\n", mountpoint, + translate_opts(shareopts)); + } + +out: + if (error != 0) + unlink(tmpfile); + else { + if (rename(tmpfile, file) == -1) { + error = errno; + unlink(tmpfile); + } else { + fflush(newfd); + /* + * Send SIGHUP to mountd, but unlock exports file later. + */ + restart_mountd(); + } + } + if (oldfd != NULL) { + flock(fileno(oldfd), LOCK_UN); + fclose(oldfd); + } + if (newfd != NULL) { + flock(fileno(newfd), LOCK_UN); + fclose(newfd); + } + return (error); +} + +/* + * Add the given mountpoint to the given exports file. + */ +int +fsshare(const char *file, const char *mountpoint, const char *shareopts) +{ + + return (fsshare_main(file, mountpoint, shareopts, 1)); +} + +/* + * Remove the given mountpoint from the given exports file. + */ +int +fsunshare(const char *file, const char *mountpoint) +{ + + return (fsshare_main(file, mountpoint, NULL, 0)); +} |