tmux/server-msg.c

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/* $OpenBSD$ */
/*
* 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"
void server_msg_fn_command(struct hdr *, struct client *);
void server_msg_fn_identify(struct hdr *, struct client *);
void server_msg_fn_resize(struct hdr *, struct client *);
void server_msg_fn_exiting(struct hdr *, struct client *);
void server_msg_fn_unlock(struct hdr *, struct client *);
void 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;
void (*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;
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) {
msg->fn(&hdr, c);
break;
}
}
if (i == nitems(server_msg_table))
fatalx("unexpected message");
}
}
void printflike2
server_msg_fn_command_error(struct cmd_ctx *ctx, const char *fmt, ...)
{
struct msg_print_data data;
va_list ap;
va_start(ap, fmt);
xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
va_end(ap);
server_write_client(ctx->cmdclient, MSG_ERROR, &data, sizeof data);
}
void printflike2
server_msg_fn_command_print(struct cmd_ctx *ctx, const char *fmt, ...)
{
struct msg_print_data data;
va_list ap;
va_start(ap, fmt);
xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
va_end(ap);
server_write_client(ctx->cmdclient, MSG_PRINT, &data, sizeof data);
}
void printflike2
server_msg_fn_command_info(struct cmd_ctx *ctx, const char *fmt, ...)
{
struct msg_print_data data;
va_list ap;
if (be_quiet)
return;
va_start(ap, fmt);
xvsnprintf(data.msg, sizeof data.msg, fmt, ap);
va_end(ap);
server_write_client(ctx->cmdclient, MSG_PRINT, &data, sizeof data);
}
void
server_msg_fn_command(struct hdr *hdr, struct client *c)
{
struct msg_command_data data;
struct cmd_ctx ctx;
struct cmd_list *cmdlist = NULL;
struct cmd *cmd;
int argc;
char **argv, *cause;
if (hdr->size < sizeof data)
fatalx("bad MSG_COMMAND size");
buffer_read(c->in, &data, sizeof data);
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;
argc = data.argc;
data.argv[(sizeof data.argv) - 1] = '\0';
if (cmd_unpack_argv(data.argv, sizeof data.argv, argc, &argv) != 0) {
server_msg_fn_command_error(&ctx, "command too long");
goto error;
}
if (argc == 0) {
argc = 1;
argv = xcalloc(1, sizeof *argv);
*argv = xstrdup("new-session");
}
if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
server_msg_fn_command_error(&ctx, "%s", cause);
cmd_free_argv(argc, argv);
goto error;
}
cmd_free_argv(argc, argv);
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");
goto error;
}
}
}
if (cmd_list_exec(cmdlist, &ctx) != 1)
server_write_client(c, MSG_EXIT, NULL, 0);
cmd_list_free(cmdlist);
return;
error:
if (cmdlist != NULL)
cmd_list_free(cmdlist);
server_write_client(c, MSG_EXIT, NULL, 0);
}
void
server_msg_fn_identify(struct hdr *hdr, struct client *c)
{
struct msg_identify_data data;
if (hdr->size < sizeof data)
fatalx("bad MSG_IDENTIFY size");
buffer_read(c->in, &data, sizeof data);
log_debug("identify msg from client: %u,%u (%d)",
data.sx, data.sy, data.version);
if (data.version != PROTOCOL_VERSION) {
server_write_error(c, "protocol version mismatch");
return;
}
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';
data.term[(sizeof data.term) - 1] = '\0';
tty_init(&c->tty, data.tty, data.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;
c->flags |= CLIENT_TERMINAL;
}
void
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);
}
void
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);
}
void
server_msg_fn_unlock(struct hdr *hdr, struct client *c)
{
struct msg_unlock_data data;
if (hdr->size != sizeof data)
fatalx("bad MSG_UNLOCK size");
buffer_read(c->in, &data, sizeof data);
log_debug("unlock msg from client");
data.pass[(sizeof data.pass) - 1] = '\0';
if (server_unlock(data.pass) != 0)
server_write_error(c, "bad password");
memset(&data, 0, sizeof data);
server_write_client(c, MSG_EXIT, NULL, 0);
}
void
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);
}