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/* ----------------------------------------------------------------------- *
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*
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* lookup_dir.c - module for including master files in a directory.
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*
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* Copyright 2011 Red Hat, Inc. All rights reserved.
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* Copyright 2011 Masatake YAMATO <yamato@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA 02139,
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* USA; either version 2 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* ----------------------------------------------------------------------- */
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#include <stdio.h>
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#include <malloc.h>
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#include <pwd.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#define MODULE_LOOKUP
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#include "automount.h"
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#include "nsswitch.h"
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#define MODPREFIX "lookup(dir): "
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#define MAX_INCLUDE_DEPTH 16
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#define AUTOFS_DIR_EXT ".autofs"
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#define AUTOFS_DIR_EXTSIZ (sizeof(AUTOFS_DIR_EXT) - 1)
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/* Work around non-GNU systems that don't provide versionsort */
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#ifdef WITHOUT_VERSIONSORT
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#define versionsort alphasort
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#endif
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struct lookup_context {
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const char *mapname;
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};
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int lookup_version = AUTOFS_LOOKUP_VERSION; /* Required by protocol */
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static int do_init(const char *mapfmt,
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int argc, const char *const *argv,
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struct lookup_context *ctxt)
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{
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struct stat st;
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if (argc < 1) {
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logerr(MODPREFIX "No map name");
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return 1;
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}
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ctxt->mapname = argv[0];
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if (ctxt->mapname[0] != '/') {
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logmsg(MODPREFIX
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"dir map %s is not an absolute pathname", argv[0]);
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return 1;
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}
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if (access(ctxt->mapname, R_OK)) {
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warn(LOGOPT_NONE, MODPREFIX
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"dir map %s missing or not readable", argv[0]);
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return 1;
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}
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if (stat(ctxt->mapname, &st)) {
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warn(LOGOPT_NONE, MODPREFIX
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"dir map %s, could not stat", argv[0]);
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return 1;
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}
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if ((!S_ISDIR(st.st_mode)) && (!S_ISLNK(st.st_mode))) {
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warn(LOGOPT_NONE, MODPREFIX
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"dir map %s, is not a directory", argv[0]);
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return 1;
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}
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return 0;
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}
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int lookup_init(const char *mapfmt,
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int argc, const char *const *argv, void **context)
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{
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struct lookup_context *ctxt;
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char buf[MAX_ERR_BUF];
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*context = NULL;
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ctxt = malloc(sizeof(struct lookup_context));
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if (!ctxt) {
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char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
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logerr(MODPREFIX "malloc: %s", estr);
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return 1;
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}
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memset(ctxt, 0, sizeof(struct lookup_context));
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if (do_init(mapfmt, argc, argv, ctxt)) {
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free(ctxt);
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return 1;
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}
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*context = ctxt;
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return 0;
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}
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int lookup_reinit(const char *mapfmt,
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int argc, const char *const *argv, void **context)
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{
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struct lookup_context *ctxt = (struct lookup_context *) *context;
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struct lookup_context new;
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int ret;
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ret = do_init(mapfmt, argc, argv, &new;;
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if (ret)
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return 1;
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ctxt->mapname = new.mapname;
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return 0;
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}
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static int acceptable_dirent_p(const struct dirent *e)
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{
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size_t namesz;
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namesz = strlen(e->d_name);
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if (!namesz)
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return 0;
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if (e->d_name[0] == '.')
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return 0;
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if (namesz < AUTOFS_DIR_EXTSIZ + 1 ||
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strcmp(e->d_name + (namesz - AUTOFS_DIR_EXTSIZ),
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AUTOFS_DIR_EXT))
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return 0;
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return 1;
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}
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static int include_file(struct master *master, time_t age, struct lookup_context* ctxt, struct dirent *e)
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{
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unsigned int logopt = master->logopt;
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char included_path[PATH_MAX + 1];
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int included_path_len;
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char *save_name;
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int status;
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included_path_len = snprintf(included_path,
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PATH_MAX + 1,
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"%s/%s",
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ctxt->mapname,
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e->d_name);
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if (included_path_len > PATH_MAX)
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return NSS_STATUS_NOTFOUND;
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save_name = master->name;
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master->name = included_path;
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master->depth++;
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debug(logopt, MODPREFIX "include: %s", master->name);
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status = lookup_nss_read_master(master, age);
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if (status != NSS_STATUS_SUCCESS) {
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warn(logopt,
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MODPREFIX
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"failed to read included master map %s",
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master->name);
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}
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master->depth--;
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master->name = save_name;
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return NSS_STATUS_SUCCESS;
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}
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int lookup_read_master(struct master *master, time_t age, void *context)
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{
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int n, i;
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struct dirent **namelist = NULL;
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struct lookup_context *ctxt = (struct lookup_context *) context;
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unsigned int logopt = master->logopt;
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char buf[MAX_ERR_BUF];
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if (master->depth > MAX_INCLUDE_DEPTH) {
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error(logopt, MODPREFIX
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"maximum include depth exceeded %s", master->name);
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return NSS_STATUS_UNAVAIL;
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}
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debug(logopt, MODPREFIX "scandir: %s", ctxt->mapname);
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n = scandir(ctxt->mapname, &namelist, acceptable_dirent_p, versionsort);
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if (n < 0) {
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char *estr = strerror_r(errno, buf, MAX_ERR_BUF);
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error(logopt,
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MODPREFIX "could not scan master map dir %s: %s",
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ctxt->mapname,
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estr);
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return NSS_STATUS_UNAVAIL;
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}
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for (i = 0; i < n; i++) {
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struct dirent *e = namelist[i];
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include_file(master, age, ctxt, e);
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free(e);
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}
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free(namelist);
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return NSS_STATUS_SUCCESS;
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}
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int lookup_read_map(struct autofs_point *ap, time_t age, void *context)
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{
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ap->entry->current = NULL;
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master_source_current_signal(ap->entry);
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return NSS_STATUS_UNKNOWN;
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}
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int lookup_mount(struct autofs_point *ap, const char *name, int name_len, void *context)
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{
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ap->entry->current = NULL;
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master_source_current_signal(ap->entry);
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return NSS_STATUS_UNKNOWN;
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}
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int lookup_done(void *context)
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{
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struct lookup_context *ctxt = (struct lookup_context *) context;
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free(ctxt);
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return 0;
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}
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