/*      $NetBSD: inetd.h,v 1.6 2022/08/10 08:37:53 christos Exp $       */

/*-
* Copyright (c) 1998, 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center and by Matthias Scheler.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* Copyright (c) 1983, 1991, 1993, 1994
*      The Regents of the University of California.  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.
* 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/

#ifndef _INETD_H
#define _INETD_H

#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <sys/queue.h>

#include <arpa/inet.h>

#include <netdb.h>
#include <stdbool.h>

#ifndef NO_RPC
#define RPC
#endif

#include <net/if.h>

#ifdef RPC
#include <rpc/rpc.h>
#include <rpc/rpcb_clnt.h>
#include <netconfig.h>
#endif


#include "pathnames.h"

#ifdef IPSEC
#include <netipsec/ipsec.h>
#ifndef IPSEC_POLICY_IPSEC      /* no ipsec support on old ipsec */
#undef IPSEC
#endif
#include "ipsec.h"
#endif

typedef enum service_type {
       NORM_TYPE = 0,
       MUX_TYPE = 1,
       MUXPLUS_TYPE = 2,
       FAITH_TYPE = 3
} service_type;

#define ISMUXPLUS(sep)  ((sep)->se_type == MUXPLUS_TYPE)
#define ISMUX(sep)      (((sep)->se_type == MUX_TYPE) || ISMUXPLUS(sep))

#define TOOMANY         40              /* don't start more than TOOMANY */

#define CONF_ERROR_FMT "%s line %zu: "

/* Log warning/error with 0 or variadic args with line number and file name */

#define ILV(prio, msg, ...) syslog(prio, CONF_ERROR_FMT msg ".", \
   CONFIG, line_number __VA_OPT__(,) __VA_ARGS__)

#define WRN(msg, ...) ILV(LOG_WARNING, msg __VA_OPT__(,) __VA_ARGS__)
#define ERR(msg, ...) ILV(LOG_ERR, msg __VA_OPT__(,) __VA_ARGS__)

/* Debug logging */
#ifdef DEBUG_ENABLE
#define DPRINTF(fmt, ...) do {\
       if (debug) {\
               fprintf(stderr, fmt "\n" __VA_OPT__(,) __VA_ARGS__);\
       }\
} while (false)
#else
#define DPRINTF(fmt, ...) __nothing
#endif

#define DPRINTCONF(fmt, ...) DPRINTF(CONF_ERROR_FMT fmt,\
       CONFIG, line_number __VA_OPT__(,) __VA_ARGS__)

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)

/* "Unspecified" indicator value for servtabs (mainly used by v2 syntax) */
#define SERVTAB_UNSPEC_VAL -1

#define SERVTAB_UNSPEC_SIZE_T SIZE_MAX

#define SERVTAB_COUNT_MAX (SIZE_MAX - (size_t)1)

/* Standard logging and debug print format for a servtab */
#define SERV_FMT "%s/%s"
#define SERV_PARAMS(sep) sep->se_service,sep->se_proto

/* rate limiting macros */
#define CNT_INTVL       ((time_t)60)    /* servers in CNT_INTVL sec. */
#define RETRYTIME       (60*10)         /* retry after bind or server fail */

struct  servtab {
       char    *se_hostaddr;           /* host address to listen on */
       char    *se_service;            /* name of service */
       int     se_socktype;            /* type of socket to use */
       sa_family_t     se_family;      /* address family */
       char    *se_proto;              /* protocol used */
       int     se_sndbuf;              /* sndbuf size */
       int     se_rcvbuf;              /* rcvbuf size */
       int     se_rpcprog;             /* rpc program number */
       int     se_rpcversl;            /* rpc program lowest version */
       int     se_rpcversh;            /* rpc program highest version */
#define isrpcservice(sep)       ((sep)->se_rpcversl != 0)
       pid_t   se_wait;                /* single threaded server */
       short   se_checked;             /* looked at during merge */
       char    *se_user;               /* user name to run as */
       char    *se_group;              /* group name to run as */
       struct  biltin *se_bi;          /* if built-in, description */
       char    *se_server;             /* server program */
#define MAXARGV 64
       char    *se_argv[MAXARGV+1];    /* program arguments */
#ifdef IPSEC
       char    *se_policy;             /* IPsec poilcy string */
#endif
       struct accept_filter_arg se_accf; /* accept filter for stream service */
       int     se_fd;                  /* open descriptor */
       service_type    se_type;        /* type */
       union {
               /* ensure correctness of C struct initializer */
               struct sockaddr_storage se_ctrladdr_storage;
               struct sockaddr se_ctrladdr;
               struct sockaddr_in      se_ctrladdr_in;
               struct sockaddr_in6     se_ctrladdr_in6; /* in6 is used by bind()/getaddrinfo */
               struct sockaddr_un      se_ctrladdr_un;
       };                              /* bound address */
       socklen_t       se_ctrladdr_size;
       size_t  se_service_max;         /* max # of instances of this service per minute */
       size_t  se_count;               /* number of instances of this service started since se_time */
       size_t  se_ip_max;              /* max # of instances of this service per ip per minute */
       SLIST_HEAD(iplist, rl_ip_node) se_rl_ip_list; /* per-address (IP) rate limting */
       time_t se_time; /* start of se_count and ip_max counts, in seconds from arbitrary point */

       /* TODO convert to using SLIST */
       struct  servtab *se_next;
};

struct rl_ip_node {
       /* Linked list entries */
       SLIST_ENTRY(rl_ip_node) entries;
       /*
        * Number of service spawns from *_addr since se_time (includes
        * attempted starts if greater than se_ip_max).
        */
       size_t count;
       union {
               struct in_addr  ipv4_addr;
#ifdef INET6
               /* align for efficient comparison in rl_try_get, could use 8 instead */
               struct in6_addr ipv6_addr __attribute__((aligned(16)));
#endif
               /*
                * other_addr is used for other address types besides the
                * special cases (IPv4/IPv6), using getnameinfo.
                */
               struct {
                       /* A field is required before the special array member */
                       char _placeholder;
                       /* malloc'd storage varies with length of string */
                       char other_addr[];
               };
       };
       /*
        * Do not declare further members after union, offsetof is used to
        * determine malloc size.
        */
};

/*
* From inetd.c
*/

void    setup(struct servtab *);
void    close_sep(struct servtab *);
void    register_rpc(struct servtab *);
void    unregister_rpc(struct servtab *);
bool    try_biltin(struct servtab *);

/* Global debug mode boolean, enabled with -d */
extern int debug;

/* rate limit or other error timed out flag */
extern int      timingout;

/* servtab linked list */
extern struct servtab *servtab;

/*
* From parse.c
*/

void    config_root(void);
int     parse_protocol(struct servtab *);
int     parse_wait(struct servtab *, int);
int     parse_server(struct servtab *, const char *);
void    parse_socktype(char *, struct servtab *);
void    parse_accept_filter(char *, struct servtab *);
char    *nextline(FILE *);
char    *newstr(const char *);

/* Current line number in current config file */
extern size_t   line_number;

/* Current config file path */
extern const char       *CONFIG;

/* Open config file */
extern FILE     *fconfig;

/* Default listening hostname/IP for current config file */
extern char     *defhost;

/* Default IPsec policy for current config file */
extern char     *policy;

/*
* From ratelimit.c
*/

int     rl_process(struct servtab *, int);
void    rl_clear_ip_list(struct servtab *);

/*
* From parse_v2.c
*/

typedef enum parse_v2_result {V2_SUCCESS, V2_SKIP, V2_ERROR} parse_v2_result;

/*
* Parse a key-values service definition, starting at the token after
* on/off (i.e. parse a series of key-values pairs terminated by a semicolon).
* Fills the provided servtab structure. Does not call freeconfig on error.
*/
parse_v2_result parse_syntax_v2(struct servtab *, char **);

#endif

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