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 "compat.h"
18 
19 #include <sys/types.h>
20 #include <sys/socket.h>
21 #include <sys/uio.h>
22 #include <sys/un.h>
23 
24 #include <errno.h>
25 #include <inttypes.h>
26 #include <stdint.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <syslog.h>
31 #include <unistd.h>
32 
33 #include "ctl_parser.h"
34 #include "kamid.h"
35 #include "log.h"
36 
37 __dead void	 usage(void);
38 
39 struct imsgbuf	*ibuf;
40 
41 __dead void
42 usage(void)
43 {
44 	/*
45 	 * XXX: this will print `kamid' if compat/getprogname.c is
46 	 * used.
47 	 */
48 	fprintf(stderr, "usage: %s [-s socket] command [argument ...]\n",
49 	    getprogname());
50 	exit(1);
51 }
52 
53 int
54 main(int argc, char **argv)
55 {
56 	struct sockaddr_un	 sun;
57 	struct parse_result	*res;
58 	struct imsg		 imsg;
59 	int			 ctl_sock;
60 	int			 done = 0;
61 	int			 n, verbose = 0;
62 	int			 ch;
63 	const char		*sockname;
64 
65 	log_init(1, LOG_DAEMON); /* Log to stderr. */
66 
67 	sockname = KD_SOCKET;
68 	while ((ch = getopt(argc, argv, "s:")) != -1) {
69 		switch (ch) {
70 		case 's':
71 			sockname = optarg;
72 			break;
73 		default:
74 			usage();
75 		}
76 	}
77 	argc -= optind;
78 	argv += optind;
79 
80 	/* parse command line */
81 	if ((res = parse(argc, argv)) == NULL)
82 		exit(1);
83 
84 	/* connect to control socket */
85 	if ((ctl_sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
86 		err(1, "socket");
87 
88 	memset(&sun, 0, sizeof(sun));
89 	sun.sun_family = AF_UNIX;
90 	strlcpy(sun.sun_path, sockname, sizeof(sun.sun_path));
91 
92 	if (connect(ctl_sock, (struct sockaddr*)&sun, sizeof(sun)) == -1)
93 		err(1, "connect: %s", sockname);
94 
95 #ifdef __OpenBSD__
96 	if (pledge("stdio", NULL) == -1)
97 		err(1, "pledge");
98 #endif
99 
100 	if ((ibuf = calloc(1, sizeof(*ibuf))) == NULL)
101 		err(1, NULL);
102 	imsg_init(ibuf, ctl_sock);
103 	done = 0;
104 
105 	/* process user request */
106 	switch (res->action) {
107 	case LOG_VERBOSE:
108 		verbose = 1;
109 		/* fallthrough */
110 	case LOG_BRIEF:
111 		imsg_compose(ibuf, IMSG_CTL_LOG_VERBOSE, 0, 0, -1,
112 		    &verbose, sizeof(verbose));
113 		puts("logging request sent.");
114 		done = 1;
115 		break;
116 	case RELOAD:
117 		imsg_compose(ibuf, IMSG_CTL_RELOAD, 0, 0, -1, NULL, 0);
118 		puts("reload request sent.");
119 		done = 1;
120 		break;
121 	case DEBUG:
122 		imsg_compose(ibuf, IMSG_CTL_DEBUG, 0, getpid(), -1, NULL, 0);
123 		break;
124 	default:
125 		usage();
126 	}
127 
128 	if (imsg_flush(ibuf) == -1)
129 		err(1, "imsg_flush");
130 
131 	while (!done) {
132 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
133 			errx(1, "write error");
134 		if (n == 0)
135 			errx(0, "pipe closed");
136 
137 		while (!done) {
138 			if ((n = imsg_get(ibuf, &imsg)) == -1)
139 				errx(1, "imsg_get error");
140 			if (n == 0)
141 				break;
142 
143 			switch (res->action) {
144 			case DEBUG: {
145 				struct kd_debug_info d;
146 
147 				if (imsg.hdr.type == IMSG_CTL_DEBUG_END) {
148 					done = 1;
149 					break;
150 				}
151 
152 				if (imsg.hdr.type != IMSG_CTL_DEBUG_BACK ||
153 				    IMSG_DATA_SIZE(imsg) != sizeof(d))
154 					errx(1, "got invalid reply (%d)",
155 					    imsg.hdr.type);
156 
157 				memcpy(&d, imsg.data, sizeof(d));
158 				if (d.path[sizeof(d.path)-1] != '\0')
159 					errx(1, "got invalid reply");
160 
161 				printf("%"PRIu32"\t%"PRIu32"\t%s\n",
162 				    d.client_id, d.fid, d.path);
163 				break;
164 			}
165 			default:
166 				break;
167 			}
168 			imsg_free(&imsg);
169 		}
170 	}
171 	close(ctl_sock);
172 	free(ibuf);
173 
174 	return 0;
175 }