commit 8e88dd908d8b5ff07649c375ff638ee6ca964ead
Author: Steve Dickson <steved@xxxxxxxxxx>
Date: Wed Aug 5 16:17:38 2009 -0400
Support routines used to read sections from the configuration file
and parse them into comma separated mount options.
Signed-off-by: Steve Dickson <steved@xxxxxxxxxx>
diff --git a/utils/mount/Makefile.am b/utils/mount/Makefile.am
index 459fa45..a1b56ca 100644
--- a/utils/mount/Makefile.am
+++ b/utils/mount/Makefile.am
@@ -17,6 +17,10 @@ mount_nfs_SOURCES = mount.c error.c network.c
fstab.c token.c \
parse_opt.h parse_dev.h \
nfs4_mount.h nfs_mount4.h stropts.h version.h
+if MOUNT_CONFIG
+mount_nfs_SOURCES += configfile.c
+endif
+
mount_nfs_LDADD = ../../support/nfs/libnfs.a \
../../support/export/libexport.a
diff --git a/utils/mount/configfile.c b/utils/mount/configfile.c
new file mode 100644
index 0000000..cad8c52
--- /dev/null
+++ b/utils/mount/configfile.c
@@ -0,0 +1,317 @@
+/*
+ * configfile.c -- mount configuration file manipulation
+ * Copyright (C) 2008 Red Hat, Inc <nfs@xxxxxxxxxx>
+ *
+ * - Routines use to create mount options from the mount
+ * configuration file.
+ *
+ * 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, 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.
+ *
+ */
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <sys/types.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "xlog.h"
+#include "conffile.h"
+
+#define KBYTES(x) ((x) * (1024))
+#define MEGABYTES(x) ((x) * (1048576))
+#define GIGABYTES(x) ((x) * (1073741824))
+
+#ifndef NFSMOUNT_GLOBAL_OPTS
+#define NFSMOUNT_GLOBAL_OPTS "NFSMount_Global_Options"
+#endif
+
+#ifndef NFSMOUNT_MOUNTPOINT "MountPoint"
+#define NFSMOUNT_MOUNTPOINT "MountPoint"
+#endif
+
+#ifndef NFSMOUNT_SERVER "Server"
+#define NFSMOUNT_SERVER "Server"
+#endif
+
+#ifndef MOUNTOPTS_CONFFILE
+#define MOUNTOPTS_CONFFILE "/etc/nfsmount.conf"
+#endif
+char *conf_path = MOUNTOPTS_CONFFILE;
+enum {
+ MNT_NOARG=0,
+ MNT_INTARG,
+ MNT_STRARG,
+ MNT_SPEC,
+ MNT_UNSET
+};
+struct mnt_alias {
+ char *alias;
+ char *opt;
+ int argtype;
+} mnt_alias_tab[] = {
+ {"background", "bg", MNT_NOARG},
+ {"foreground", "fg", MNT_NOARG},
+ {"sloppy", "sloppy", MNT_NOARG},
+};
+int mnt_alias_sz = (sizeof(mnt_alias_tab)/sizeof(mnt_alias_tab[0]));
+
+/*
+ * See if the option is an alias, if so return the
+ * real mount option along with the argument type.
+ */
+inline static
+char *mountopts_alias(char *opt, int *argtype)
+{
+ int i;
+
+ *argtype = MNT_UNSET;
+ for (i=0; i < mnt_alias_sz; i++) {
+ if (strcasecmp(opt, mnt_alias_tab[i].alias) != 0)
+ continue;
+ *argtype = mnt_alias_tab[i].argtype;
+ return mnt_alias_tab[i].opt;
+ }
+ return opt;
+}
+/*
+ * Convert numeric strings that end with 'k', 'm' or 'g'
+ * into numeric strings with the real value.
+ * Meaning '8k' becomes '8094'.
+ */
+char *mountopts_convert(char *value)
+{
+ unsigned long long factor, num;
+ static char buf[64];
+ char *ch;
+
+ ch = &value[strlen(value)-1];
+ switch (tolower(*ch)) {
+ case 'k':
+ factor = KBYTES(1);
+ break;
+ case 'm':
+ factor = MEGABYTES(1);
+ break;
+ case 'g':
+ factor = GIGABYTES(1);
+ break;
+ default:
+ return value;
+ }
+ *ch = '\0';
+ if (strncmp(value, "0x", 2) == 0) {
+ num = strtol(value, (char **)NULL, 16);
+ } else if (strncmp(value, "0", 1) == 0) {
+ num = strtol(value, (char **)NULL, 8);
+ } else {
+ num = strtol(value, (char **)NULL, 10);
+ }
+ num *= factor;
+ snprintf(buf, 64, "%lld", num);
+
+ return buf;
+}
+
+struct entry {
+ SLIST_ENTRY(entry) entries;
+ char *opt;
+};
+static SLIST_HEAD(shead, entry) head = SLIST_HEAD_INITIALIZER(head);
+static int list_size;
+
+/*
+ * Add option to the link list
+ */
+inline static void
+add_entry(char *opt)
+{
+ struct entry *entry;
+
+ entry = calloc(1, sizeof(struct entry));
+ if (entry == NULL) {
+ xlog_warn("Unable calloc memory for mount configs");
+ return;
+ }
+ entry->opt = strdup(opt);
+ if (entry->opt == NULL) {
+ xlog_warn("Unable calloc memory for mount opts");
+ free(entry);
+ return;
+ }
+ SLIST_INSERT_HEAD(&head, entry, entries);
+}
+/*
+ * See if the given entry exists if the link list,
+ * if so return that entry
+ */
+inline static
+char *lookup_entry(char *opt)
+{
+ struct entry *entry;
+
+ SLIST_FOREACH(entry, &head, entries) {
+ if (strcasecmp(entry->opt, opt) == 0)
+ return opt;
+ }
+ return NULL;
+}
+/*
+ * Free all entries on the link list
+ */
+inline static
+void free_all(void)
+{
+ struct entry *entry;
+
+ while (!SLIST_EMPTY(&head)) {
+ entry = SLIST_FIRST(&head);
+ SLIST_REMOVE_HEAD(&head, entries);
+ free(entry->opt);
+ free(entry);
+ }
+}
+/*
+ * Parse the given section of the configuration
+ * file to if there are any mount options set.
+ * If so, added them to link list.
+ */
+static void
+conf_parse_mntopts(char *section, char *arg, char *opts)
+{
+ struct conf_list *list;
+ struct conf_list_node *node;
+ char buf[BUFSIZ], *value, *field;
+ char *nvalue, *ptr;
+ int argtype;
+
+ list = conf_get_tag_list(section);
+ TAILQ_FOREACH(node, &list->fields, link) {
+ /*
+ * Do not overwrite options if already exists
+ */
+ snprintf(buf, BUFSIZ, "%s=", node->field);
+ if (opts && strstr(opts, buf) != NULL)
+ continue;
+ if (lookup_entry(node->field) != NULL)
+ continue;
+ buf[0] = '\0';
+ value = conf_get_section(section, arg, node->field);
+ if (value == NULL)
+ continue;
+ field = mountopts_alias(node->field, &argtype);
+ if (strcasecmp(value, "false") == 0) {
+ if (argtype != MNT_NOARG)
+ snprintf(buf, BUFSIZ, "no%s", field);
+ } else if (strcasecmp(value, "true") == 0) {
+ snprintf(buf, BUFSIZ, "%s", field);
+ } else {
+ nvalue = strdup(value);
+ ptr = mountopts_convert(nvalue);
+ snprintf(buf, BUFSIZ, "%s=%s", field, ptr);
+ free(nvalue);
+ }
+ if (buf[0] == '\0')
+ continue;
+ /*
+ * Keep a running tally of the list size adding
+ * one for the ',' that will be appened later
+ */
+ list_size += strlen(buf) + 1;
+ add_entry(buf);
+ }
+ conf_free_list(list);
+}
+
+/*
+ * Concatenate options from the configuration file with the
+ * given options by building a link list of options from the
+ * different sections in the conf file. Options that exists
+ * in the either the given options or link list are not
+ * overwritten so it matter which when each section is
+ * parsed.
+ */
+char *conf_get_mntopts(char *spec, char *mount_point,
+ char *mount_opts)
+{
+ struct entry *entry;
+ char *ptr, *server, *config_opts;
+ int optlen = 0;
+
+ SLIST_INIT(&head);
+ list_size = 0;
+ /*
+ * First see if there are any mount options relative
+ * to the mount point.
+ */
+ conf_parse_mntopts(NFSMOUNT_MOUNTPOINT, mount_point, mount_opts);
+
+ /*
+ * Next, see if there are any mount options relative
+ * to the server
+ */
+ server = strdup(spec);
+ if (server == NULL) {
+ xlog_warn("conf_get_mountops: Unable calloc memory for server");
+ free_all();
+ return mount_opts;
+ }
+ if ((ptr = strchr(server, ':')) != NULL)
+ *ptr='\0';
+ conf_parse_mntopts(NFSMOUNT_SERVER, server, mount_opts);
+ free(server);
+
+ /*
+ * Finally process all the global mount options.
+ */
+ conf_parse_mntopts(NFSMOUNT_GLOBAL_OPTS, NULL, mount_opts);
+
+ /*
+ * If no mount options were found in the configuration file
+ * just return what was passed in .
+ */
+ if (SLIST_EMPTY(&head))
+ return mount_opts;
+
+ /*
+ * Found options in the configuration file. So
+ * concatenate the configuration options with the
+ * options that were passed in
+ */
+ if (mount_opts)
+ optlen = strlen(mount_opts);
+
+ /* list_size + optlen + ',' + '\0' */
+ config_opts = calloc(1, (list_size+optlen+2));
+ if (server == NULL) {
+ xlog_warn("conf_get_mountops: Unable calloc memory for
config_opts");
+ free_all();
+ return mount_opts;
+ }
+ if (mount_opts) {
+ strcpy(config_opts, mount_opts);
+ strcat(config_opts, ",");
+ }
+ SLIST_FOREACH(entry, &head, entries) {
+ strcat(config_opts, entry->opt);
+ strcat(config_opts, ",");
+ }
+ *(strrchr(config_opts, ',')) = '\0';
+
+ free_all();
+ if (mount_opts)
+ free(mount_opts);
+
+ return config_opts;
+}
