tmux/server-msg.c

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/* $OpenBSD: server-msg.c,v 1.2 2009/06/04 21:43:24 nicm Exp $ */
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/*
* 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>
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#include <stdlib.h>
#include <string.h>
#include <time.h>
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#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 *, ...);
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struct server_msg {
enum hdrtype type;
int (*fn)(struct hdr *, struct client *);
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};
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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 },
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};
int
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server_msg_dispatch(struct client *c)
{
struct hdr hdr;
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const struct server_msg *msg;
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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");
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}
}
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)
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{
struct msg_command_data data;
struct cmd_ctx ctx;
struct cmd_list *cmdlist;
struct cmd *cmd;
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if (hdr->size < sizeof data)
fatalx("bad MSG_COMMAND size");
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buffer_read(c->in, &data, sizeof data);
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cmdlist = cmd_list_recv(c->in);
server_activity = time(NULL);
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ctx.error = server_msg_fn_command_error;
ctx.print = server_msg_fn_command_print;
ctx.info = server_msg_fn_command_info;
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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) {
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server_msg_fn_command_error(&ctx,
"sessions should be nested with care. "
"unset $TMUX to force");
cmd_list_free(cmdlist);
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server_write_client(c, MSG_EXIT, NULL, 0);
return (0);
}
}
}
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if (cmd_list_exec(cmdlist, &ctx) != 1)
server_write_client(c, MSG_EXIT, NULL, 0);
cmd_list_free(cmdlist);
return (0);
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}
int
server_msg_fn_identify(struct hdr *hdr, struct client *c)
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{
struct msg_identify_data data;
char *term;
if (hdr->size < sizeof data)
fatalx("bad MSG_IDENTIFY size");
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buffer_read(c->in, &data, sizeof data);
term = cmd_recv_string(c->in);
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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
return (0);
}
c->tty.sx = data.sx;
c->tty.sy = data.sy;
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c->cwd = NULL;
if (*data.cwd != '\0')
c->cwd = xstrdup(data.cwd);
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data.tty[(sizeof data.tty) - 1] = '\0';
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tty_init(&c->tty, data.tty, term);
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if (data.flags & IDENTIFY_UTF8)
c->tty.flags |= TTY_UTF8;
if (data.flags & IDENTIFY_256COLOURS)
c->tty.term_flags |= TERM_256COLOURS;
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else if (data.flags & IDENTIFY_88COLOURS)
c->tty.term_flags |= TERM_88COLOURS;
if (data.flags & IDENTIFY_HASDEFAULTS)
c->tty.term_flags |= TERM_HASDEFAULTS;
xfree(term);
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c->flags |= CLIENT_TERMINAL;
return (0);
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}
int
server_msg_fn_resize(struct hdr *hdr, struct client *c)
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{
struct msg_resize_data data;
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if (hdr->size != sizeof data)
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fatalx("bad MSG_RESIZE size");
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buffer_read(c->in, &data, sizeof data);
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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;
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c->tty.cx = UINT_MAX;
c->tty.cy = UINT_MAX;
c->tty.rupper = UINT_MAX;
c->tty.rlower = UINT_MAX;
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recalculate_sizes();
/* Always redraw this client. */
server_redraw_client(c);
return (0);
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}
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;
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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);
}