1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
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 #include <sys/socket.h>
18 #include <sys/un.h>
19 
20 #include <err.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <syslog.h>
25 #include <unistd.h>
26 
27 #include "ctl_parser.h"
28 #include "kamid.h"
29 #include "log.h"
30 
31 __dead void	 usage(void);
32 
33 struct imsgbuf	*ibuf;
34 
35 __dead void
36 usage(void)
37 {
38 	/*
39 	 * XXX: this will print `kamid' if compat/getprogname.c is
40 	 * used.
41 	 */
42 	fprintf(stderr, "usage: %s [-s socket] command [argument ...]\n",
43 	    getprogname());
44 	exit(1);
45 }
46 
47 int
48 main(int argc, char **argv)
49 {
50 	struct sockaddr_un	 sun;
51 	struct parse_result	*res;
52 	struct imsg		 imsg;
53 	int			 ctl_sock;
54 	int			 done = 0;
55 	int			 n, verbose = 0;
56 	int			 ch;
57 	const char		*sockname;
58 
59 	log_init(1, LOG_DAEMON); /* Log to stderr. */
60 
61 	sockname = KD_SOCKET;
62 	while ((ch = getopt(argc, argv, "s:")) != -1) {
63 		switch (ch) {
64 		case 's':
65 			sockname = optarg;
66 			break;
67 		default:
68 			usage();
69 		}
70 	}
71 	argc -= optind;
72 	argv += optind;
73 
74 	/* parse command line */
75 	if ((res = parse(argc, argv)) == NULL)
76 		exit(1);
77 
78 	/* connect to control socket */
79 	if ((ctl_sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
80 		err(1, "socket");
81 
82 	memset(&sun, 0, sizeof(sun));
83 	sun.sun_family = AF_UNIX;
84 	strlcpy(sun.sun_path, sockname, sizeof(sun.sun_path));
85 
86 	if (connect(ctl_sock, (struct sockaddr*)&sun, sizeof(sun)) == -1)
87 		err(1, "connect: %s", sockname);
88 
89 #ifdef __OpenBSD__
90 	if (pledge("stdio", NULL) == -1)
91 		err(1, "pledge");
92 #endif
93 
94 	if ((ibuf = calloc(1, sizeof(*ibuf))) == NULL)
95 		err(1, NULL);
96 	imsg_init(ibuf, ctl_sock);
97 	done = 0;
98 
99 	/* process user request */
100 	switch (res->action) {
101 	case LOG_VERBOSE:
102 		verbose = 1;
103 		/* fallthrough */
104 	case LOG_BRIEF:
105 		imsg_compose(ibuf, IMSG_CTL_LOG_VERBOSE, 0, 0, -1,
106 		    &verbose, sizeof(verbose));
107 		puts("logging request sent.");
108 		done = 1;
109 		break;
110 	case RELOAD:
111 		imsg_compose(ibuf, IMSG_CTL_RELOAD, 0, 0, -1, NULL, 0);
112 		puts("reload request sent.");
113 		done = 1;
114 		break;
115 	default:
116 		usage();
117 	}
118 
119 	imsg_flush(ibuf);
120 
121 	/*
122 	 * Later we may add commands which requires a response.
123 	 */
124 	while (!done) {
125 		if ((n = imsg_get(ibuf, &imsg)) == -1)
126 			errx(1, "imsg_get error");
127 		if (n == 0)
128 			break;
129 
130 		switch (res->action) {
131 		default:
132 			break;
133 		}
134 		imsg_free(&imsg);
135 	}
136 	close(ctl_sock);
137 	free(ibuf);
138 
139 	return 0;
140 }