summaryrefslogtreecommitdiff
path: root/usr.bin/tmux/server-msg.c
blob: d89831021f0dc6d421d20b92466f6d177ef35abb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
/* $OpenBSD: server-msg.c,v 1.5 2009/07/07 17:24:32 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

int	server_msg_fn_command(struct hdr *, struct client *);
int	server_msg_fn_identify(struct hdr *, struct client *);
int	server_msg_fn_resize(struct hdr *, struct client *);
int	server_msg_fn_exiting(struct hdr *, struct client *);
int	server_msg_fn_unlock(struct hdr *, struct client *);
int	server_msg_fn_wakeup(struct hdr *, struct client *);

void printflike2 server_msg_fn_command_error(
    	    struct cmd_ctx *, const char *, ...);
void printflike2 server_msg_fn_command_print(
    	    struct cmd_ctx *, const char *, ...);
void printflike2 server_msg_fn_command_info(
    	    struct cmd_ctx *, const char *, ...);

struct server_msg {
	enum hdrtype	type;
	int	        (*fn)(struct hdr *, struct client *);
};
const struct server_msg server_msg_table[] = {
	{ MSG_IDENTIFY, server_msg_fn_identify },
	{ MSG_COMMAND, server_msg_fn_command },
	{ MSG_RESIZE, server_msg_fn_resize },
	{ MSG_EXITING, server_msg_fn_exiting },
	{ MSG_UNLOCK, server_msg_fn_unlock },
	{ MSG_WAKEUP, server_msg_fn_wakeup },
};

int
server_msg_dispatch(struct client *c)
{
	struct hdr		 hdr;
	const struct server_msg	*msg;
	u_int		 	 i;
	int			 n;

	for (;;) {
		if (BUFFER_USED(c->in) < sizeof hdr)
			return (0);
		memcpy(&hdr, BUFFER_OUT(c->in), sizeof hdr);
		if (BUFFER_USED(c->in) < (sizeof hdr) + hdr.size)
			return (0);
		buffer_remove(c->in, sizeof hdr);

		for (i = 0; i < nitems(server_msg_table); i++) {
			msg = server_msg_table + i;
			if (msg->type == hdr.type) {
				if ((n = msg->fn(&hdr, c)) != 0)
					return (n);
				break;
			}
		}
		if (i == nitems(server_msg_table))
			fatalx("unexpected message");
	}
}

void printflike2
server_msg_fn_command_error(struct cmd_ctx *ctx, const char *fmt, ...)
{
	va_list	ap;
	char   *msg;

	va_start(ap, fmt);
	xvasprintf(&msg, fmt, ap);
	va_end(ap);

	server_write_client(ctx->cmdclient, MSG_ERROR, msg, strlen(msg));
	xfree(msg);
}

void printflike2
server_msg_fn_command_print(struct cmd_ctx *ctx, const char *fmt, ...)
{
	va_list	ap;
	char   *msg;

	va_start(ap, fmt);
	xvasprintf(&msg, fmt, ap);
	va_end(ap);

	server_write_client(ctx->cmdclient, MSG_PRINT, msg, strlen(msg));
	xfree(msg);
}

void printflike2
server_msg_fn_command_info(struct cmd_ctx *ctx, const char *fmt, ...)
{
	va_list	ap;
	char   *msg;

	if (be_quiet)
		return;

	va_start(ap, fmt);
	xvasprintf(&msg, fmt, ap);
	va_end(ap);

	server_write_client(ctx->cmdclient, MSG_PRINT, msg, strlen(msg));
	xfree(msg);
}

int
server_msg_fn_command(struct hdr *hdr, struct client *c)
{
	struct msg_command_data	data;
	struct cmd_ctx	 	ctx;
	struct cmd_list	       *cmdlist;
	struct cmd	       *cmd;

	if (hdr->size < sizeof data)
		fatalx("bad MSG_COMMAND size");
	buffer_read(c->in, &data, sizeof data);

	cmdlist = cmd_list_recv(c->in);
	server_activity = time(NULL);

	ctx.error = server_msg_fn_command_error;
	ctx.print = server_msg_fn_command_print;
	ctx.info = server_msg_fn_command_info;

	ctx.msgdata = &data;
	ctx.curclient = NULL;
	ctx.cursession = NULL;

	ctx.cmdclient = c;

	if (data.pid != -1) {
		TAILQ_FOREACH(cmd, cmdlist, qentry) {
			if (cmd->entry->flags & CMD_CANTNEST) {
				server_msg_fn_command_error(&ctx,
				    "sessions should be nested with care. "
				    "unset $TMUX to force");
				cmd_list_free(cmdlist);
				server_write_client(c, MSG_EXIT, NULL, 0);
				return (0);
			}
		}
	}

	if (cmd_list_exec(cmdlist, &ctx) != 1)
		server_write_client(c, MSG_EXIT, NULL, 0);
	cmd_list_free(cmdlist);
	return (0);
}

int
server_msg_fn_identify(struct hdr *hdr, struct client *c)
{
	struct msg_identify_data	data;
        char			       *term;

	if (hdr->size < sizeof data)
		fatalx("bad MSG_IDENTIFY size");
	buffer_read(c->in, &data, sizeof data);
	term = cmd_recv_string(c->in);

	log_debug("identify msg from client: %u,%u (%d)",
	    data.sx, data.sy, data.version);

	if (data.version != PROTOCOL_VERSION) {
#define MSG "protocol version mismatch"
		server_write_client(c, MSG_ERROR, MSG, (sizeof MSG) - 1);
#undef MSG
		server_write_client(c, MSG_EXIT, NULL, 0);
		return (0);
	}

	c->tty.sx = data.sx;
	c->tty.sy = data.sy;

	c->cwd = NULL;
	data.cwd[(sizeof data.cwd) - 1] = '\0';
	if (*data.cwd != '\0')
		c->cwd = xstrdup(data.cwd);

	data.tty[(sizeof data.tty) - 1] = '\0';
	tty_init(&c->tty, data.tty, term);
	if (data.flags & IDENTIFY_UTF8)
		c->tty.flags |= TTY_UTF8;
	if (data.flags & IDENTIFY_256COLOURS)
		c->tty.term_flags |= TERM_256COLOURS;
	else if (data.flags & IDENTIFY_88COLOURS)
		c->tty.term_flags |= TERM_88COLOURS;
	if (data.flags & IDENTIFY_HASDEFAULTS)
		c->tty.term_flags |= TERM_HASDEFAULTS;

	if (term != NULL)
		xfree(term);

	c->flags |= CLIENT_TERMINAL;

	return (0);
}

int
server_msg_fn_resize(struct hdr *hdr, struct client *c)
{
	struct msg_resize_data	data;

	if (hdr->size != sizeof data)
		fatalx("bad MSG_RESIZE size");
	buffer_read(c->in, &data, sizeof data);

	log_debug("resize msg from client: %u,%u", data.sx, data.sy);

	c->tty.sx = data.sx;
	if (c->tty.sx == 0)
		c->tty.sx = 80;
	c->tty.sy = data.sy;
	if (c->tty.sy == 0)
		c->tty.sy = 25;

	c->tty.cx = UINT_MAX;
	c->tty.cy = UINT_MAX;
	c->tty.rupper = UINT_MAX;
	c->tty.rlower = UINT_MAX;

	recalculate_sizes();

	/* Always redraw this client. */
	server_redraw_client(c);

	return (0);
}

int
server_msg_fn_exiting(struct hdr *hdr, struct client *c)
{
	if (hdr->size != 0)
		fatalx("bad MSG_EXITING size");

	log_debug("exiting msg from client");

	c->session = NULL;

	tty_close(&c->tty, c->flags & CLIENT_SUSPENDED);

	server_write_client(c, MSG_EXITED, NULL, 0);

	return (0);
}

int
server_msg_fn_unlock(struct hdr *hdr, struct client *c)
{
        char	*pass;

	if (hdr->size == 0)
		fatalx("bad MSG_UNLOCK size");
	pass = cmd_recv_string(c->in);

	log_debug("unlock msg from client");

	if (server_unlock(pass) != 0) {
#define MSG "bad password"
		server_write_client(c, MSG_ERROR, MSG, (sizeof MSG) - 1);
#undef MSG
	}

	server_write_client(c, MSG_EXIT, NULL, 0);

	memset(pass, 0, strlen(pass));
	xfree(pass);

	return (0);
}

int
server_msg_fn_wakeup(struct hdr *hdr, struct client *c)
{
	if (hdr->size != 0)
		fatalx("bad MSG_WAKEUP size");

	log_debug("wakeup msg from client");

	c->flags &= ~CLIENT_SUSPENDED;
	tty_start_tty(&c->tty);
	server_redraw_client(c);

	return (0);
}