tmux/server-fn.c
Tiago Cunha 39afe3fc2a Sync OpenBSD patchset 388:
Set the current window pointer to NULL when killing a winlink that is to be
replaced with link-window -k. This prevents it being pushed onto the last
window stack and causing a use-after-free.

Only took me an hour to find this :-/...
2009-10-12 00:37:41 +00:00

374 lines
8.1 KiB
C

/* $Id: server-fn.c,v 1.94 2009-10-12 00:37:41 tcunha 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 <string.h>
#include <time.h>
#include <unistd.h>
#include "tmux.h"
void
server_fill_environ(struct session *s, struct environ *env)
{
char tmuxvar[MAXPATHLEN], *term;
u_int idx;
if (session_index(s, &idx) != 0)
fatalx("session not found");
xsnprintf(tmuxvar, sizeof tmuxvar,
"%s,%ld,%u", socket_path, (long) getpid(), idx);
environ_set(env, "TMUX", tmuxvar);
term = options_get_string(&s->options, "default-terminal");
environ_set(env, "TERM", term);
}
void
server_write_error(struct client *c, const char *msg)
{
struct msg_print_data printdata;
strlcpy(printdata.msg, msg, sizeof printdata.msg);
server_write_client(c, MSG_ERROR, &printdata, sizeof printdata);
}
void
server_write_client(
struct client *c, enum msgtype type, const void *buf, size_t len)
{
struct imsgbuf *ibuf = &c->ibuf;
if (c->flags & CLIENT_BAD)
return;
log_debug("writing %d to client %d", type, c->ibuf.fd);
imsg_compose(ibuf, type, PROTOCOL_VERSION, -1, -1, (void *) buf, len);
}
void
server_write_session(
struct session *s, enum msgtype type, const void *buf, size_t len)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session == s)
server_write_client(c, type, buf, len);
}
}
void
server_redraw_client(struct client *c)
{
c->flags |= CLIENT_REDRAW;
}
void
server_status_client(struct client *c)
{
c->flags |= CLIENT_STATUS;
}
void
server_redraw_session(struct session *s)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session == s)
server_redraw_client(c);
}
}
void
server_redraw_session_group(struct session *s)
{
struct session_group *sg;
if ((sg = session_group_find(s)) == NULL)
server_redraw_session(s);
else {
TAILQ_FOREACH(s, &sg->sessions, gentry)
server_redraw_session(s);
}
}
void
server_status_session(struct session *s)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session == s)
server_status_client(c);
}
}
void
server_status_session_group(struct session *s)
{
struct session_group *sg;
if ((sg = session_group_find(s)) == NULL)
server_status_session(s);
else {
TAILQ_FOREACH(s, &sg->sessions, gentry)
server_status_session(s);
}
}
void
server_redraw_window(struct window *w)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
if (c->session->curw->window == w)
server_redraw_client(c);
}
w->flags |= WINDOW_REDRAW;
}
void
server_status_window(struct window *w)
{
struct session *s;
u_int i;
/*
* This is slightly different. We want to redraw the status line of any
* clients containing this window rather than any where it is the
* current window.
*/
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
s = ARRAY_ITEM(&sessions, i);
if (s != NULL && session_has(s, w))
server_status_session(s);
}
}
void
server_lock(void)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
server_lock_client(c);
}
}
void
server_lock_session(struct session *s)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL || c->session != s)
continue;
server_lock_client(c);
}
}
void
server_lock_client(struct client *c)
{
const char *cmd;
size_t cmdlen;
struct msg_lock_data lockdata;
if (c->flags & CLIENT_SUSPENDED)
return;
cmd = options_get_string(&c->session->options, "lock-command");
cmdlen = strlcpy(lockdata.cmd, cmd, sizeof lockdata.cmd);
if (cmdlen >= sizeof lockdata.cmd)
return;
tty_stop_tty(&c->tty);
tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_SMCUP));
tty_raw(&c->tty, tty_term_string(c->tty.term, TTYC_CLEAR));
c->flags |= CLIENT_SUSPENDED;
server_write_client(c, MSG_LOCK, &lockdata, sizeof lockdata);
}
void
server_kill_window(struct window *w)
{
struct session *s;
struct winlink *wl;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
s = ARRAY_ITEM(&sessions, i);
if (s == NULL || !session_has(s, w))
continue;
if ((wl = winlink_find_by_window(&s->windows, w)) == NULL)
continue;
if (session_detach(s, wl))
server_destroy_session_group(s);
else {
server_redraw_session(s);
server_status_session_group(s);
}
}
}
int
server_link_window(struct session *src, struct winlink *srcwl,
struct session *dst, int dstidx, int killflag, int selectflag, char **cause)
{
struct winlink *dstwl;
struct session_group *srcsg, *dstsg;
srcsg = session_group_find(src);
dstsg = session_group_find(dst);
if (src != dst && srcsg != NULL && dstsg != NULL && srcsg == dstsg) {
xasprintf(cause, "sessions are grouped");
return (-1);
}
dstwl = NULL;
if (dstidx != -1)
dstwl = winlink_find_by_index(&dst->windows, dstidx);
if (dstwl != NULL) {
if (dstwl->window == srcwl->window)
return (0);
if (killflag) {
/*
* Can't use session_detach as it will destroy session
* if this makes it empty.
*/
session_alert_cancel(dst, dstwl);
winlink_stack_remove(&dst->lastw, dstwl);
winlink_remove(&dst->windows, dstwl);
/* Force select/redraw if current. */
if (dstwl == dst->curw) {
selectflag = 1;
dst->curw = NULL;
}
}
}
if (dstidx == -1)
dstidx = -1 - options_get_number(&dst->options, "base-index");
dstwl = session_attach(dst, srcwl->window, dstidx, cause);
if (dstwl == NULL)
return (-1);
if (selectflag)
session_select(dst, dstwl->idx);
server_redraw_session_group(dst);
return (0);
}
void
server_unlink_window(struct session *s, struct winlink *wl)
{
if (session_detach(s, wl))
server_destroy_session_group(s);
else
server_redraw_session_group(s);
}
void
server_destroy_session_group(struct session *s)
{
struct session_group *sg;
if ((sg = session_group_find(s)) == NULL)
server_destroy_session(s);
else {
TAILQ_FOREACH(s, &sg->sessions, gentry)
server_destroy_session(s);
TAILQ_REMOVE(&session_groups, sg, entry);
xfree(sg);
}
}
void
server_destroy_session(struct session *s)
{
struct client *c;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session != s)
continue;
c->session = NULL;
server_write_client(c, MSG_EXIT, NULL, 0);
}
}
void
server_set_identify(struct client *c)
{
struct timeval tv;
int delay;
delay = options_get_number(&c->session->options, "display-panes-time");
tv.tv_sec = delay / 1000;
tv.tv_usec = (delay % 1000) * 1000L;
if (gettimeofday(&c->identify_timer, NULL) != 0)
fatal("gettimeofday failed");
timeradd(&c->identify_timer, &tv, &c->identify_timer);
c->flags |= CLIENT_IDENTIFY;
c->tty.flags |= (TTY_FREEZE|TTY_NOCURSOR);
server_redraw_client(c);
}
void
server_clear_identify(struct client *c)
{
if (c->flags & CLIENT_IDENTIFY) {
c->flags &= ~CLIENT_IDENTIFY;
c->tty.flags &= ~(TTY_FREEZE|TTY_NOCURSOR);
server_redraw_client(c);
}
}