1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1991, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/time.h>
33#include <sys/socket.h>
34#include <sys/un.h>
35#include <sys/queue.h>
36
37#include <netinet/in.h>
38
39#include <stdio.h>
40
41#define BUFSIZE 8192
42#define LINESIZ 72
43
44#define NORM_TYPE	0
45#define MUX_TYPE	1
46#define MUXPLUS_TYPE	2
47#define FAITH_TYPE	4
48#define ISMUX(sep)	(((sep)->se_type == MUX_TYPE) || \
49			 ((sep)->se_type == MUXPLUS_TYPE))
50#define ISMUXPLUS(sep)	((sep)->se_type == MUXPLUS_TYPE)
51
52struct procinfo {
53	LIST_ENTRY(procinfo) pr_link;
54	pid_t		pr_pid;		/* child pid */
55	struct conninfo	*pr_conn;
56};
57
58struct conninfo {
59	LIST_ENTRY(conninfo) co_link;
60	struct sockaddr_storage	co_addr;	/* source address */
61	int		co_numchild;	/* current number of children */
62	struct procinfo	**co_proc;	/* array of child proc entry */
63};
64
65#define PERIPSIZE	256
66
67struct	stabchild {
68	LIST_ENTRY(stabchild)	sc_link;
69	pid_t			sc_pid;
70};
71
72struct	servtab {
73	char	*se_service;		/* name of service */
74	int	se_socktype;		/* type of socket to use */
75	int	se_family;		/* address family */
76	char	*se_proto;		/* protocol used */
77	int	se_maxchild;		/* max number of children */
78	int	se_maxcpm;		/* max connects per IP per minute */
79	int	se_numchild;		/* current number of children */
80	char	*se_user;		/* user name to run as */
81	char    *se_group;              /* group name to run as */
82#ifdef  LOGIN_CAP
83	char    *se_class;              /* login class name to run with */
84#endif
85	struct	biltin *se_bi;		/* if built-in, description */
86	char	*se_server;		/* server program */
87	char	*se_server_name;	/* server program without path */
88#define	MAXARGV 20
89	char	*se_argv[MAXARGV+1];	/* program arguments */
90#ifdef IPSEC
91	char	*se_policy;		/* IPsec policy string */
92#endif
93	int	se_fd;			/* open descriptor */
94	union {				/* bound address */
95		struct	sockaddr se_un_ctrladdr;
96		struct	sockaddr_in se_un_ctrladdr4;
97		struct	sockaddr_in6 se_un_ctrladdr6;
98	        struct  sockaddr_un se_un_ctrladdr_un;
99	} se_un;
100#define se_ctrladdr	se_un.se_un_ctrladdr
101#define se_ctrladdr4	se_un.se_un_ctrladdr4
102#define se_ctrladdr6	se_un.se_un_ctrladdr6
103#define se_ctrladdr_un   se_un.se_un_ctrladdr_un
104  	socklen_t	se_ctrladdr_size;
105	uid_t	se_sockuid;		/* Owner for unix domain socket */
106	gid_t	se_sockgid;		/* Group for unix domain socket */
107	mode_t	se_sockmode;		/* Mode for unix domain socket */
108	u_char	se_type;		/* type: normal, mux, or mux+ */
109	u_char	se_checked;		/* looked at during merge */
110	u_char	se_accept;		/* i.e., wait/nowait mode */
111	u_char	se_rpc;			/* ==1 if RPC service */
112	int	se_rpc_prog;		/* RPC program number */
113	u_int	se_rpc_lowvers;		/* RPC low version */
114	u_int	se_rpc_highvers;	/* RPC high version */
115	int	se_count;		/* number started since se_time */
116	struct	timespec se_time;	/* start of se_count */
117	struct	servtab *se_next;
118	struct se_flags {
119		u_int se_nomapped : 1;
120		u_int se_reset : 1;
121	} se_flags;
122	int	se_maxperip;		/* max number of children per src */
123	LIST_HEAD(, conninfo) se_conn[PERIPSIZE];
124	LIST_HEAD(, stabchild) se_children;
125};
126
127#define	se_nomapped		se_flags.se_nomapped
128#define	se_reset		se_flags.se_reset
129
130#define	SERVTAB_AT_LIMIT(sep)		\
131	((sep)->se_maxchild > 0 && (sep)->se_numchild == (sep)->se_maxchild)
132#define	SERVTAB_EXCEEDS_LIMIT(sep)	\
133	((sep)->se_maxchild > 0 && (sep)->se_numchild >= (sep)->se_maxchild)
134
135int		check_loop(const struct sockaddr *, const struct servtab *sep);
136void		inetd_setproctitle(const char *, int);
137struct servtab *tcpmux(int);
138
139extern int	 debug;
140extern struct servtab *servtab;
141
142typedef void (bi_fn_t)(int, struct servtab *);
143
144struct biltin {
145	const char *bi_service;		/* internally provided service name */
146	int	bi_socktype;		/* type of socket supported */
147	short	bi_fork;		/* 1 if should fork before call */
148	int	bi_maxchild;		/* max number of children, -1=default */
149	bi_fn_t	*bi_fn;			/* function which performs it */
150};
151extern struct biltin biltins[];
152