1 /*
2  * Copyright (c) 2010-2015 Reyk Floeter <reyk@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 /* imsg */
18 struct imsgev {
19 	struct imsgbuf		 ibuf;
20 	void			(*handler)(int, short, void *);
21 	struct event		 ev;
22 	struct privsep_proc	*proc;
23 	void			*data;
24 	short			 events;
25 };
26 
27 #define IMSG_SIZE_CHECK(imsg, p) do {					\
28 	if (IMSG_DATA_SIZE(imsg) < sizeof(*p))				\
29 		fatalx("bad length imsg received (%s)",	#p);		\
30 } while (0)
31 #define IMSG_DATA_SIZE(imsg)	((imsg)->hdr.len - IMSG_HEADER_SIZE)
32 
33 #define PROC_PARENT_SOCK_FILENO	3
34 
35 /* privsep */
36 enum privsep_procid {
37 	PROC_PARENT,
38 	PROC_SERVER,
39 	PROC_LOGGER,
40 	PROC_MAX,
41 };
42 
43 #define CONFIG_RELOAD		0x00
44 #define CONFIG_SOCKS		0x01
45 #define CONFIG_ALL		0xff
46 
47 struct privsep_pipes {
48 	int				*pp_pipes[PROC_MAX];
49 };
50 
51 struct privsep {
52 	struct privsep_pipes		*ps_pipes[PROC_MAX];
53 	struct privsep_pipes		*ps_pp;
54 
55 	struct imsgev			*ps_ievs[PROC_MAX];
56 	const char			*ps_title[PROC_MAX];
57 	uint8_t				 ps_what[PROC_MAX];
58 
59 	struct passwd			*ps_pw;
60 	int				 ps_noaction;
61 
62 	unsigned int			 ps_instances[PROC_MAX];
63 	unsigned int			 ps_instance;
64 
65 	/* Event and signal handlers */
66 	struct event			 ps_evsigint;
67 	struct event			 ps_evsigterm;
68 	struct event			 ps_evsigchld;
69 	struct event			 ps_evsighup;
70 
71 	void				*ps_env;
72 };
73 
74 struct privsep_proc {
75 	const char		*p_title;
76 	enum privsep_procid	 p_id;
77 	int			(*p_cb)(int, struct privsep_proc *,
78 				    struct imsg *);
79 	void			(*p_init)(struct privsep *,
80 				    struct privsep_proc *);
81 	void			(*p_shutdown)(void);
82 	const char		*p_chroot;
83 	struct passwd		*p_pw;
84 	struct privsep		*p_ps;
85 };
86 
87 struct privsep_fd {
88 	enum privsep_procid		 pf_procid;
89 	unsigned int			 pf_instance;
90 };
91 
92 /* proc.c */
93 void	 proc_init(struct privsep *, struct privsep_proc *, unsigned int,
94 	    int, int, char **, enum privsep_procid);
95 void	 proc_kill(struct privsep *);
96 void	 proc_connect(struct privsep *ps);
97 void	 proc_dispatch(int, short event, void *);
98 void	 proc_range(struct privsep *, enum privsep_procid, int *, int *);
99 void	 proc_run(struct privsep *, struct privsep_proc *,
100 	    struct privsep_proc *, unsigned int,
101 	    void (*)(struct privsep *, struct privsep_proc *, void *), void *);
102 void	 imsg_event_add(struct imsgev *);
103 int	 imsg_compose_event(struct imsgev *, uint16_t, uint32_t,
104 	    pid_t, int, void *, uint16_t);
105 int	 imsg_composev_event(struct imsgev *, uint16_t, uint32_t,
106 	    pid_t, int, const struct iovec *, int);
107 int	 proc_compose_imsg(struct privsep *, enum privsep_procid, int,
108 	    uint16_t, uint32_t, int, void *, uint16_t);
109 int	 proc_compose(struct privsep *, enum privsep_procid,
110 	    uint16_t, void *data, uint16_t);
111 int	 proc_composev_imsg(struct privsep *, enum privsep_procid, int,
112 	    uint16_t, uint32_t, int, const struct iovec *, int);
113 int	 proc_composev(struct privsep *, enum privsep_procid,
114 	    uint16_t, const struct iovec *, int);
115 int	 proc_forward_imsg(struct privsep *, struct imsg *,
116 	    enum privsep_procid, int);
117 struct imsgbuf *
118 	 proc_ibuf(struct privsep *, enum privsep_procid, int);
119 struct imsgev *
120 	 proc_iev(struct privsep *, enum privsep_procid, int);
121 enum privsep_procid
122 	 proc_getid(struct privsep_proc *, unsigned int, const char *);
123 int	 proc_flush_imsg(struct privsep *, enum privsep_procid, int);