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/* Copyright (c) 1998-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@suse.de>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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6c4009 |
modify it under the terms of the GNU Lesser General Public
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6c4009 |
License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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6c4009 |
Lesser General Public License for more details.
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6c4009 |
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* This file defines everything that client code should need to
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know to talk to the nscd daemon. */
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#ifndef _NSCD_CLIENT_H
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#define _NSCD_CLIENT_H 1
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <atomic.h>
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#include <nscd-types.h>
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#include <sys/uio.h>
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/* Version number of the daemon interface */
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#define NSCD_VERSION 2
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/* Path of the file where the PID of the running system is stored. */
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#define _PATH_NSCDPID "/var/run/nscd/nscd.pid"
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/* Path for the Unix domain socket. */
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#define _PATH_NSCDSOCKET "/var/run/nscd/socket"
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/* Path for the configuration file. */
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#define _PATH_NSCDCONF "/etc/nscd.conf"
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/* Maximum allowed length for the key. */
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#define MAXKEYLEN 1024
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/* Available services. */
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typedef enum
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{
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GETPWBYNAME,
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GETPWBYUID,
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GETGRBYNAME,
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GETGRBYGID,
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GETHOSTBYNAME,
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GETHOSTBYNAMEv6,
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GETHOSTBYADDR,
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GETHOSTBYADDRv6,
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SHUTDOWN, /* Shut the server down. */
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GETSTAT, /* Get the server statistic. */
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INVALIDATE, /* Invalidate one special cache. */
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GETFDPW,
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GETFDGR,
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GETFDHST,
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GETAI,
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INITGROUPS,
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GETSERVBYNAME,
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GETSERVBYPORT,
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GETFDSERV,
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GETNETGRENT,
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INNETGR,
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GETFDNETGR,
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LASTREQ
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} request_type;
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/* Header common to all requests */
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typedef struct
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{
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int32_t version; /* Version number of the daemon interface. */
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request_type type; /* Service requested. */
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int32_t key_len; /* Key length. */
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} request_header;
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/* Structure sent in reply to password query. Note that this struct is
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sent also if the service is disabled or there is no record found. */
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typedef struct
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{
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int32_t version;
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int32_t found;
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nscd_ssize_t pw_name_len;
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nscd_ssize_t pw_passwd_len;
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uid_t pw_uid;
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gid_t pw_gid;
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nscd_ssize_t pw_gecos_len;
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nscd_ssize_t pw_dir_len;
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nscd_ssize_t pw_shell_len;
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} pw_response_header;
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/* Structure sent in reply to group query. Note that this struct is
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sent also if the service is disabled or there is no record found. */
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typedef struct
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{
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int32_t version;
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int32_t found;
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nscd_ssize_t gr_name_len;
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nscd_ssize_t gr_passwd_len;
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gid_t gr_gid;
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nscd_ssize_t gr_mem_cnt;
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} gr_response_header;
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/* Structure sent in reply to host query. Note that this struct is
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sent also if the service is disabled or there is no record found. */
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typedef struct
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{
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int32_t version;
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int32_t found;
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nscd_ssize_t h_name_len;
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nscd_ssize_t h_aliases_cnt;
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int32_t h_addrtype;
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int32_t h_length;
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nscd_ssize_t h_addr_list_cnt;
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int32_t error;
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} hst_response_header;
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/* Structure sent in reply to addrinfo query. Note that this struct is
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sent also if the service is disabled or there is no record found. */
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typedef struct
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{
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int32_t version;
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int32_t found;
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nscd_ssize_t naddrs;
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nscd_ssize_t addrslen;
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nscd_ssize_t canonlen;
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int32_t error;
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} ai_response_header;
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/* Structure filled in by __nscd_getai. */
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struct nscd_ai_result
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{
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int naddrs;
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char *canon;
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uint8_t *family;
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char *addrs;
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};
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/* Structure sent in reply to initgroups query. Note that this struct is
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sent also if the service is disabled or there is no record found. */
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typedef struct
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{
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int32_t version;
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int32_t found;
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nscd_ssize_t ngrps;
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} initgr_response_header;
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/* Structure sent in reply to services query. Note that this struct is
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sent also if the service is disabled or there is no record found. */
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typedef struct
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{
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int32_t version;
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int32_t found;
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nscd_ssize_t s_name_len;
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nscd_ssize_t s_proto_len;
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nscd_ssize_t s_aliases_cnt;
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int32_t s_port;
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} serv_response_header;
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/* Structure send in reply to netgroup query. Note that this struct is
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sent also if the service is disabled or there is no record found. */
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typedef struct
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{
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int32_t version;
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int32_t found;
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nscd_ssize_t nresults;
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nscd_ssize_t result_len;
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} netgroup_response_header;
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typedef struct
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{
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int32_t version;
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int32_t found;
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int32_t result;
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} innetgroup_response_header;
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/* Type for offsets in data part of database. */
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typedef uint32_t ref_t;
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/* Value for invalid/no reference. */
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#define ENDREF UINT32_MAX
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/* Timestamp type. */
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typedef uint64_t nscd_time_t;
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/* Maximum timestamp. */
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#define MAX_TIMEOUT_VALUE \
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(sizeof (time_t) == sizeof (long int) ? LONG_MAX : INT_MAX)
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/* Alignment requirement of the beginning of the data region. */
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#define ALIGN 16
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/* Head of record in data part of database. */
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struct datahead
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{
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nscd_ssize_t allocsize; /* Allocated Bytes. */
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nscd_ssize_t recsize; /* Size of the record. */
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nscd_time_t timeout; /* Time when this entry becomes invalid. */
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uint8_t notfound; /* Nonzero if data has not been found. */
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uint8_t nreloads; /* Reloads without use. */
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uint8_t usable; /* False if the entry must be ignored. */
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uint8_t unused; /* Unused. */
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uint32_t ttl; /* TTL value used. */
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/* We need to have the following element aligned for the response
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header data types and their use in the 'struct dataset' types
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defined in the XXXcache.c files. */
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union
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{
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pw_response_header pwdata;
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gr_response_header grdata;
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hst_response_header hstdata;
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ai_response_header aidata;
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initgr_response_header initgrdata;
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serv_response_header servdata;
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netgroup_response_header netgroupdata;
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innetgroup_response_header innetgroupdata;
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nscd_ssize_t align1;
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nscd_time_t align2;
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} data[0];
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};
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static inline time_t
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datahead_init_common (struct datahead *head, nscd_ssize_t allocsize,
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nscd_ssize_t recsize, uint32_t ttl)
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{
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/* Initialize so that we don't write out junk in uninitialized data to the
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cache. */
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memset (head, 0, sizeof (*head));
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head->allocsize = allocsize;
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head->recsize = recsize;
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head->usable = true;
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head->ttl = ttl;
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/* Compute and return the timeout time. */
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return head->timeout = time (NULL) + ttl;
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}
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6c4009 |
|
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static inline time_t
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datahead_init_pos (struct datahead *head, nscd_ssize_t allocsize,
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nscd_ssize_t recsize, uint8_t nreloads, uint32_t ttl)
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{
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time_t ret = datahead_init_common (head, allocsize, recsize, ttl);
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6c4009 |
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head->notfound = false;
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head->nreloads = nreloads;
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6c4009 |
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6c4009 |
return ret;
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6c4009 |
}
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6c4009 |
|
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6c4009 |
static inline time_t
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6c4009 |
datahead_init_neg (struct datahead *head, nscd_ssize_t allocsize,
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nscd_ssize_t recsize, uint32_t ttl)
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{
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6c4009 |
time_t ret = datahead_init_common (head, allocsize, recsize, ttl);
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6c4009 |
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6c4009 |
/* We don't need to touch nreloads here since it is set to our desired value
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6c4009 |
(0) when we clear the structure. */
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6c4009 |
head->notfound = true;
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6c4009 |
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6c4009 |
return ret;
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6c4009 |
}
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6c4009 |
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6c4009 |
/* Structure for one hash table entry. */
|
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6c4009 |
struct hashentry
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6c4009 |
{
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Packit |
6c4009 |
request_type type:8; /* Which type of dataset. */
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6c4009 |
bool first; /* True if this was the original key. */
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Packit |
6c4009 |
nscd_ssize_t len; /* Length of key. */
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Packit |
6c4009 |
ref_t key; /* Pointer to key. */
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Packit |
6c4009 |
int32_t owner; /* If secure table, this is the owner. */
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Packit |
6c4009 |
ref_t next; /* Next entry in this hash bucket list. */
|
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Packit |
6c4009 |
ref_t packet; /* Records for the result. */
|
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Packit |
6c4009 |
union
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6c4009 |
{
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Packit |
6c4009 |
struct hashentry *dellist; /* Next record to be deleted. This can be a
|
|
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6c4009 |
pointer since only nscd uses this field. */
|
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6c4009 |
ref_t *prevp; /* Pointer to field containing forward
|
|
Packit |
6c4009 |
reference. */
|
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Packit |
6c4009 |
};
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6c4009 |
};
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6c4009 |
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6c4009 |
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6c4009 |
/* Current persistent database version. */
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6c4009 |
#define DB_VERSION 2
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6c4009 |
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6c4009 |
/* Maximum time allowed between updates of the timestamp. */
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6c4009 |
#define MAPPING_TIMEOUT (5 * 60)
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6c4009 |
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6c4009 |
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6c4009 |
/* Used indices for the EXTRA_DATA element of 'database_pers_head'.
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Each database has its own indices. */
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6c4009 |
#define NSCD_HST_IDX_CONF_TIMESTAMP 0
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6c4009 |
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6c4009 |
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6c4009 |
/* Header of persistent database file. */
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6c4009 |
struct database_pers_head
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6c4009 |
{
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6c4009 |
int32_t version;
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6c4009 |
int32_t header_size;
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6c4009 |
volatile int32_t gc_cycle;
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6c4009 |
volatile int32_t nscd_certainly_running;
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6c4009 |
volatile nscd_time_t timestamp;
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6c4009 |
/* Room for extensions. */
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6c4009 |
volatile uint32_t extra_data[4];
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6c4009 |
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6c4009 |
nscd_ssize_t module;
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6c4009 |
nscd_ssize_t data_size;
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6c4009 |
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6c4009 |
nscd_ssize_t first_free; /* Offset of first free byte in data area. */
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6c4009 |
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6c4009 |
nscd_ssize_t nentries;
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nscd_ssize_t maxnentries;
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6c4009 |
nscd_ssize_t maxnsearched;
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6c4009 |
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6c4009 |
uint64_t poshit;
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6c4009 |
uint64_t neghit;
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6c4009 |
uint64_t posmiss;
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6c4009 |
uint64_t negmiss;
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6c4009 |
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6c4009 |
uint64_t rdlockdelayed;
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6c4009 |
uint64_t wrlockdelayed;
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6c4009 |
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6c4009 |
uint64_t addfailed;
|
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6c4009 |
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6c4009 |
ref_t array[0];
|
|
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6c4009 |
};
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6c4009 |
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6c4009 |
|
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6c4009 |
/* Mapped database record. */
|
|
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6c4009 |
struct mapped_database
|
|
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6c4009 |
{
|
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6c4009 |
const struct database_pers_head *head;
|
|
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6c4009 |
const char *data;
|
|
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6c4009 |
size_t mapsize;
|
|
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6c4009 |
int counter; /* > 0 indicates it is usable. */
|
|
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6c4009 |
size_t datasize;
|
|
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6c4009 |
};
|
|
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6c4009 |
#define NO_MAPPING ((struct mapped_database *) -1l)
|
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6c4009 |
|
|
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6c4009 |
struct locked_map_ptr
|
|
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6c4009 |
{
|
|
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6c4009 |
int lock;
|
|
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6c4009 |
struct mapped_database *mapped;
|
|
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6c4009 |
};
|
|
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6c4009 |
#define libc_locked_map_ptr(class, name) class struct locked_map_ptr name
|
|
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6c4009 |
|
|
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6c4009 |
/* Try acquiring lock for mapptr, returns true if it succeeds, false
|
|
Packit |
6c4009 |
if not. */
|
|
Packit |
6c4009 |
static inline bool
|
|
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6c4009 |
__nscd_acquire_maplock (volatile struct locked_map_ptr *mapptr)
|
|
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6c4009 |
{
|
|
Packit |
6c4009 |
int cnt = 0;
|
|
Packit |
6c4009 |
while (__builtin_expect (atomic_compare_and_exchange_val_acq (&mapptr->lock,
|
|
Packit |
6c4009 |
1, 0) != 0, 0))
|
|
Packit |
6c4009 |
{
|
|
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6c4009 |
// XXX Best number of rounds?
|
|
Packit |
6c4009 |
if (__glibc_unlikely (++cnt > 5))
|
|
Packit |
6c4009 |
return false;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
atomic_spin_nop ();
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return true;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
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6c4009 |
/* Open socket connection to nscd server. */
|
|
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6c4009 |
extern int __nscd_open_socket (const char *key, size_t keylen,
|
|
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6c4009 |
request_type type, void *response,
|
|
Packit |
6c4009 |
size_t responselen) attribute_hidden;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Try to get a file descriptor for the shared meory segment
|
|
Packit |
6c4009 |
containing the database. */
|
|
Packit |
6c4009 |
extern struct mapped_database *__nscd_get_mapping (request_type type,
|
|
Packit |
6c4009 |
const char *key,
|
|
Packit |
6c4009 |
struct mapped_database **mappedp) attribute_hidden;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Get reference of mapping. */
|
|
Packit |
6c4009 |
extern struct mapped_database *__nscd_get_map_ref (request_type type,
|
|
Packit |
6c4009 |
const char *name,
|
|
Packit |
6c4009 |
volatile struct locked_map_ptr *mapptr,
|
|
Packit |
6c4009 |
int *gc_cyclep)
|
|
Packit |
6c4009 |
attribute_hidden;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Unmap database. */
|
|
Packit |
6c4009 |
extern void __nscd_unmap (struct mapped_database *mapped)
|
|
Packit |
6c4009 |
attribute_hidden;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Drop reference of mapping. */
|
|
Packit |
6c4009 |
static int
|
|
Packit |
6c4009 |
__attribute__ ((unused))
|
|
Packit |
6c4009 |
__nscd_drop_map_ref (struct mapped_database *map, int *gc_cycle)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (map != NO_MAPPING)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
int now_cycle = map->head->gc_cycle;
|
|
Packit |
6c4009 |
if (__glibc_unlikely (now_cycle != *gc_cycle))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
/* We might have read inconsistent data. */
|
|
Packit |
6c4009 |
*gc_cycle = now_cycle;
|
|
Packit |
6c4009 |
return -1;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (atomic_decrement_val (&map->counter) == 0)
|
|
Packit |
6c4009 |
__nscd_unmap (map);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
return 0;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Search the mapped database. */
|
|
Packit |
6c4009 |
extern struct datahead *__nscd_cache_search (request_type type,
|
|
Packit |
6c4009 |
const char *key,
|
|
Packit |
6c4009 |
size_t keylen,
|
|
Packit |
6c4009 |
const struct mapped_database *mapped,
|
|
Packit |
6c4009 |
size_t datalen)
|
|
Packit |
6c4009 |
attribute_hidden;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Wrappers around read, readv and write that only read/write less than LEN
|
|
Packit |
6c4009 |
bytes on error or EOF. */
|
|
Packit |
6c4009 |
extern ssize_t __readall (int fd, void *buf, size_t len)
|
|
Packit |
6c4009 |
attribute_hidden;
|
|
Packit |
6c4009 |
extern ssize_t __readvall (int fd, const struct iovec *iov, int iovcnt)
|
|
Packit |
6c4009 |
attribute_hidden;
|
|
Packit |
6c4009 |
extern ssize_t writeall (int fd, const void *buf, size_t len)
|
|
Packit |
6c4009 |
attribute_hidden;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Get netlink timestamp counter from mapped area or zero. */
|
|
Packit |
6c4009 |
extern uint32_t __nscd_get_nl_timestamp (void)
|
|
Packit |
6c4009 |
attribute_hidden;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#endif /* nscd.h */
|