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screen/socket.c
Daniel Baumann e88291c4cd
Adding upstream version 4.9.1. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-22 15:19:57 +02:00

1944 lines
46 KiB
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/* Copyright (c) 2008, 2009
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Micah Cowan (micah@cowan.name)
* Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
* Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Copyright (c) 1987 Oliver Laumann
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING); if not, see
* https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*
****************************************************************
*/
#include "config.h"
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
# include <sys/socket.h>
# ifdef _OpenBSD_
# include <sys/uio.h>
# endif
# include <sys/un.h>
#ifndef SIGINT
# include <signal.h>
#endif
#include "screen.h"
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# include <sys/dir.h>
# define dirent direct
#endif
#ifndef CMSG_LEN
#define CMSG_LEN(length) ((_CMSG_DATA_ALIGN(sizeof(struct cmsghdr))) + (length))
#endif
#ifndef CMSG_SPACE
#define CMSG_SPACE(length) ((_CMSG_DATA_ALIGN(sizeof(struct cmsghdr))) + (_CMSG_DATA_ALIGN(length)))
#endif
#include "extern.h"
#include "list_generic.h"
static int CheckPid __P((int));
static void ExecCreate __P((struct msg *));
static void DoCommandMsg __P((struct msg *));
#if defined(_SEQUENT_)
# define connect sconnect /* _SEQUENT_ has braindamaged connect */
static int sconnect __P((int, struct sockaddr *, int));
#endif
static void FinishAttach __P((struct msg *));
static void FinishDetach __P((struct msg *));
static void AskPassword __P((struct msg *));
extern char *RcFileName, *extra_incap, *extra_outcap;
extern int ServerSocket, real_uid, real_gid, eff_uid, eff_gid;
extern int dflag, iflag, rflag, lsflag, quietflag, wipeflag, xflag;
extern int queryflag;
extern char *attach_tty, *LoginName, HostName[];
extern struct display *display, *displays;
extern struct win *fore, **wtab, *console_window, *windows;
extern struct layer *flayer;
extern struct layout *layout_attach, *layout_last, layout_last_marker;
extern struct NewWindow nwin_undef;
#ifdef MULTIUSER
extern char *multi;
#endif
extern int maxwin;
extern char *getenv();
extern char SockPath[];
extern struct event serv_read;
extern char *rc_name;
extern struct comm comms[];
#ifdef MULTIUSER
# define SOCKMODE (S_IWRITE | S_IREAD | (displays ? S_IEXEC : 0) | (multi ? 1 : 0))
#else
# define SOCKMODE (S_IWRITE | S_IREAD | (displays ? S_IEXEC : 0))
#endif
/*
* Socket directory manager
*
* fdp: pointer to store the first good socket.
* nfoundp: pointer to store the number of sockets found matching.
* notherp: pointer to store the number of sockets not matching.
* match: string to match socket name.
*
* The socket directory must be in SockPath!
* The global variables LoginName, multi, rflag, xflag, dflag,
* quietflag, SockPath are used.
*
* The first good socket is stored in fdp and its name is
* appended to SockPath.
* If none exists or fdp is NULL SockPath is not changed.
*
* Returns: number of good sockets.
*
*/
int
FindSocket(fdp, nfoundp, notherp, match, is_sock)
int *fdp;
int *nfoundp, *notherp;
char *match;
bool *is_sock;
{
DIR *dirp;
struct dirent *dp;
struct stat st;
int mode;
int sdirlen;
int matchlen = 0;
char *name, *n;
int firsts = -1, sockfd;
char *firstn = NULL;
int nfound = 0, ngood = 0, ndead = 0, nwipe = 0, npriv = 0;
int nperfect = 0;
struct sent
{
struct sent *next;
int mode;
char *name;
} *slist, **slisttail, *sent, *nsent;
if (match)
{
matchlen = strlen(match);
#ifdef NAME_MAX
if (matchlen > NAME_MAX)
matchlen = NAME_MAX;
#endif
}
/*
* SockPath contains the socket directory.
* At the end of FindSocket the socket name will be appended to it.
* Thus FindSocket() can only be called once!
*/
sdirlen = strlen(SockPath);
#ifdef USE_SETEUID
xseteuid(real_uid);
xsetegid(real_gid);
#endif
if ((dirp = opendir(SockPath)) == 0)
Panic(errno, "Cannot opendir %s", SockPath);
slist = 0;
slisttail = &slist;
while ((dp = readdir(dirp)))
{
int cmatch = 0;
name = dp->d_name;
debug1("- %s\n", name);
if (*name == 0 || *name == '.' || strlen(name) > 2*MAXSTR)
continue;
if (matchlen)
{
n = name;
/* if we don't want to match digits. Skip them */
if ((*match <= '0' || *match > '9') && (*n > '0' && *n <= '9'))
{
while (*n >= '0' && *n <= '9')
n++;
if (*n == '.')
n++;
}
/* the tty prefix is optional */
if (strncmp(match, "tty", 3) && strncmp(n, "tty", 3) == 0)
n += 3;
if (strncmp(match, n, matchlen))
{
if (n == name && *match > '0' && *match <= '9')
{
while (*n >= '0' && *n <= '9')
n++;
if (*n == '.')
n++;
if (strncmp(match, n, matchlen))
continue;
}
else
continue;
}
else
cmatch = (*(n + matchlen) == 0);
debug1(" -> matched %s\n", match);
}
sprintf(SockPath + sdirlen, "/%s", name);
debug1("stat %s\n", SockPath);
errno = 0;
debug2("uid = %d, gid = %d\n", getuid(), getgid());
debug2("euid = %d, egid = %d\n", geteuid(), getegid());
if (stat(SockPath, &st))
{
debug1("errno = %d\n", errno);
continue;
}
*is_sock = S_ISSOCK(st.st_mode);
if (!(*is_sock) && !S_ISFIFO(st.st_mode))
continue;
debug2("st.st_uid = %d, real_uid = %d\n", st.st_uid, real_uid);
#ifdef SOCKDIR /* if SOCKDIR is not defined, the socket is in $HOME.
in that case it does not make sense to compare uids. */
if ((int)st.st_uid != real_uid)
continue;
#endif
mode = (int)st.st_mode & 0777;
debug1(" has mode 0%03o\n", mode);
#ifdef MULTIUSER
if (multi && ((mode & 0677) != 0601))
{
debug(" is not a MULTI-USER session");
if (strcmp(multi, LoginName))
{
debug(" and we are in a foreign directory.\n");
mode = -4;
}
else
{
debug(", but it is our own session.\n");
}
}
#endif
debug(" store it.\n");
if ((sent = (struct sent *)malloc(sizeof(struct sent))) == 0)
continue;
sent->next = 0;
sent->name = SaveStr(name);
sent->mode = mode;
*slisttail = sent;
slisttail = &sent->next;
nfound++;
sockfd = MakeClientSocket(0, *is_sock);
#ifdef USE_SETEUID
/* MakeClientSocket sets ids back to eff */
xseteuid(real_uid);
xsetegid(real_gid);
#endif
if (sockfd == -1)
{
debug2(" MakeClientSocket failed, unreachable? %d %d\n",
matchlen, wipeflag);
sent->mode = -3;
#ifndef SOCKDIR_IS_LOCAL_TO_HOST
/* Unreachable - it is dead if we detect that it's local
* or we specified a match
*/
n = name + strlen(name) - 1;
while (n != name && *n != '.')
n--;
if (matchlen == 0 && !(*n == '.' && n[1] && strncmp(HostName, n + 1, strlen(n + 1)) == 0))
{
npriv++; /* a good socket that was not for us */
continue;
}
#endif
ndead++;
sent->mode = -1;
if (wipeflag)
{
if (unlink(SockPath) == 0)
{
sent->mode = -2;
nwipe++;
}
}
continue;
}
mode &= 0776;
/* Shall we connect ? */
debug2(" connecting: mode=%03o, rflag=%d, ", mode, rflag);
debug2("xflag=%d, dflag=%d ?\n", xflag, dflag);
/*
* mode 600: socket is detached.
* mode 700: socket is attached.
* xflag implies rflag here.
*
* fail, when socket mode mode is not 600 or 700
* fail, when we want to detach w/o reattach, but it already is detached.
* fail, when we only want to attach, but mode 700 and not xflag.
* fail, if none of dflag, rflag, xflag is set.
*/
if ((mode != 0700 && mode != 0600) ||
(dflag && !rflag && !xflag && mode == 0600) ||
(!dflag && rflag && mode == 0700 && !xflag) ||
(!dflag && !rflag && !xflag))
{
close(sockfd);
debug(" no!\n");
npriv++; /* a good socket that was not for us */
continue;
}
ngood++;
if (cmatch)
nperfect++;
if (fdp && (firsts == -1 || (cmatch && nperfect == 1)))
{
if (firsts != -1)
close(firsts);
firsts = sockfd;
firstn = sent->name;
debug(" taken.\n");
}
else
{
debug(" discarded.\n");
close(sockfd);
}
}
(void)closedir(dirp);
if (!lsflag && nperfect == 1)
ngood = nperfect;
if (nfound && (lsflag || ngood != 1) && !quietflag)
{
switch(ngood)
{
case 0:
Msg(0, nfound > 1 ? "There are screens on:" : "There is a screen on:");
break;
case 1:
Msg(0, nfound > 1 ? "There are several screens on:" : "There is a suitable screen on:");
break;
default:
Msg(0, "There are several suitable screens on:");
break;
}
for (sent = slist; sent; sent = sent->next)
{
switch (sent->mode)
{
case 0700:
printf("\t%s\t(Attached)\n", sent->name);
break;
case 0600:
printf("\t%s\t(Detached)\n", sent->name);
break;
#ifdef MULTIUSER
case 0701:
printf("\t%s\t(Multi, attached)\n", sent->name);
break;
case 0601:
printf("\t%s\t(Multi, detached)\n", sent->name);
break;
#endif
case -1:
/* No trigraphs here! */
printf("\t%s\t(Dead ?%c?)\n", sent->name, '?');
break;
case -2:
printf("\t%s\t(Removed)\n", sent->name);
break;
case -3:
printf("\t%s\t(Remote or dead)\n", sent->name);
break;
case -4:
printf("\t%s\t(Private)\n", sent->name);
break;
}
}
}
if (ndead && !quietflag)
{
char *m = "Remove dead screens with 'screen -wipe'.";
if (wipeflag)
Msg(0, "%d socket%s wiped out.", nwipe, nwipe > 1 ? "s" : "");
else
Msg(0, m, ndead > 1 ? "s" : "", ndead > 1 ? "" : "es"); /* other args for nethack */
}
if (firsts != -1)
{
sprintf(SockPath + sdirlen, "/%s", firstn);
*fdp = firsts;
}
else
SockPath[sdirlen] = 0;
for (sent = slist; sent; sent = nsent)
{
nsent = sent->next;
free(sent->name);
free((char *)sent);
}
#ifdef USE_SETEUID
xseteuid(eff_uid);
xsetegid(eff_gid);
#endif
if (notherp)
*notherp = npriv;
if (nfoundp)
*nfoundp = nfound - nwipe;
return ngood;
}
/* FIFO (legacy mode) */
static int
MakeServerFifo()
{
register int s;
struct stat st;
#ifdef USE_SETEUID
xseteuid(real_uid);
xsetegid(real_gid);
#endif
s = open(SockPath, O_WRONLY | O_NONBLOCK);
if (s >= 0)
{
debug("huii, my fifo already exists??\n");
if (quietflag)
{
Kill(D_userpid, SIG_BYE);
eexit(11);
}
Msg(0, "There is already a screen running on %s.", Filename(SockPath));
if (stat(SockPath, &st) < 0)
Panic(errno, "stat");
#ifdef SOCKDIR /* if SOCKDIR is not defined, the socket is in $HOME. \
in that case it does not make sense to compare uids. */
if ((int)st.st_uid != real_uid)
Panic(0, "Unfortunately you are not its owner.");
#endif
if ((st.st_mode & 0700) == 0600)
Panic(0, "To resume it, use \"screen -r\"");
else
Panic(0, "It is not detached.");
/* NOTREACHED */
}
# ifdef USE_SETEUID
(void) unlink(SockPath);
if (mkfifo(SockPath, SOCKMODE) < 0)
Panic(0, "mkfifo %s failed", SockPath);
# ifdef BROKEN_PIPE
s = open(SockPath, O_RDWR | O_NONBLOCK, 0);
# else
s = open(SockPath, O_RDONLY | O_NONBLOCK, 0);
# endif
if (s < 0)
Panic(errno, "open fifo %s", SockPath);
xseteuid(eff_uid);
xsetegid(eff_gid);
return s;
# else /* !USE_SETEUID */
if (UserContext() > 0)
{
(void) unlink(SockPath);
UserReturn(mkfifo(SockPath, SOCKMODE));
}
if (UserStatus())
Panic(0, "mkfifo %s failed", SockPath);
# ifdef BROKEN_PIPE
s = secopen(SockPath, O_RDWR | O_NONBLOCK, 0);
# else
s = secopen(SockPath, O_RDONLY | O_NONBLOCK, 0);
# endif
if (s < 0)
Panic(errno, "open fifo %s", SockPath);
return s;
# endif /* !USE_SETEUID */
}
static int
MakeClientFifo(err)
int err;
{
register int s = 0;
s = secopen(SockPath, O_WRONLY | O_NONBLOCK, 0);
if (s >= 0)
{
(void) fcntl(s, F_SETFL, 0);
return s;
}
if (err)
Msg(errno, "%s", SockPath);
debug2("MakeClientSocket() open %s failed (%d)\n", SockPath, errno);
return -1;
}
/* Unix Domain Sockets */
static int
MakeServerUnixSocket()
{
register int s;
struct sockaddr_un a;
struct stat st;
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0)
Panic(errno, "socket");
a.sun_family = AF_UNIX;
strncpy(a.sun_path, SockPath, sizeof(a.sun_path));
a.sun_path[sizeof(a.sun_path) - 1] = 0;
# ifdef USE_SETEUID
xseteuid(real_uid);
xsetegid(real_gid);
# endif
if (connect(s, (struct sockaddr *) &a, strlen(SockPath) + 2) != -1)
{
debug("oooooh! socket already is alive!\n");
if (quietflag)
{
Kill(D_userpid, SIG_BYE);
/*
* oh, well. nobody receives that return code. papa
* dies by signal.
*/
eexit(11);
}
Msg(0, "There is already a screen running on %s.", Filename(SockPath));
if (stat(SockPath, &st) < 0)
Panic(errno, "stat");
#ifdef SOCKDIR /* if SOCKDIR is not defined, the socket is in $HOME. \
in that case it does not make sense to compare uids. */
if (st.st_uid != real_uid)
Panic(0, "Unfortunately you are not its owner.");
#endif
if ((st.st_mode & 0700) == 0600)
Panic(0, "To resume it, use \"screen -r\"");
else
Panic(0, "It is not detached.");
/* NOTREACHED */
}
#if defined(m88k) || defined(sysV68)
close(s); /* we get bind: Invalid argument if this is not done */
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0)
Panic(errno, "reopen socket");
#endif
(void) unlink(SockPath);
if (bind(s, (struct sockaddr *) & a, strlen(SockPath) + 2) == -1)
Panic(errno, "bind (%s)", SockPath);
#ifdef SOCK_NOT_IN_FS
{
int f = secopen(SockPath, O_RDWR | O_CREAT, SOCKMODE);
if (f < 0)
Panic(errno, "shadow socket open");
close(f);
}
#else
chmod(SockPath, SOCKMODE);
#ifndef USE_SETEUID
chown(SockPath, real_uid, real_gid);
#endif
#endif /* SOCK_NOT_IN_FS */
if (listen(s, 5) == -1)
Panic(errno, "listen");
#ifdef F_SETOWN
fcntl(s, F_SETOWN, getpid());
debug1("Serversocket owned by %d\n", fcntl(s, F_GETOWN, 0));
#endif /* F_SETOWN */
#ifdef USE_SETEUID
xseteuid(eff_uid);
xsetegid(eff_gid);
#endif
return s;
}
static int
MakeClientUnixSocket(err)
int err;
{
register int s;
struct sockaddr_un a;
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0)
Panic(errno, "socket");
a.sun_family = AF_UNIX;
strncpy(a.sun_path, SockPath, sizeof(a.sun_path));
a.sun_path[sizeof(a.sun_path) - 1] = 0;
#ifdef USE_SETEUID
xseteuid(real_uid);
xsetegid(real_gid);
#else
if (access(SockPath, W_OK))
{
if (err)
Msg(errno, "%s", SockPath);
debug2("MakeClientSocket: access(%s): %d.\n", SockPath, errno);
close(s);
return -1;
}
#endif
if (connect(s, (struct sockaddr *)&a, strlen(SockPath) + 2) == -1)
{
if (err)
Msg(errno, "%s: connect", SockPath);
debug("MakeClientSocket: connect failed.\n");
close(s);
s = -1;
}
#ifdef USE_SETEUID
xseteuid(eff_uid);
xsetegid(eff_gid);
#endif
return s;
}
int
MakeServerSocket(socket)
bool socket;
{
if (socket)
return MakeServerUnixSocket();
return MakeServerFifo();
}
int
MakeClientSocket(err, socket)
int err;
bool socket;
{
if (socket)
return MakeClientUnixSocket(err);
return MakeClientFifo(err);
}
/*
**
** Message send and receive routines
**
*/
void
SendCreateMsg(sty, nwin)
char *sty;
struct NewWindow *nwin;
{
int s;
struct msg m;
register char *p;
register int len, n;
char **av;
bool is_socket;
#ifdef NAME_MAX
if (strlen(sty) > NAME_MAX)
sty[NAME_MAX] = 0;
#endif
if (strlen(sty) > 2 * MAXSTR - 1)
sty[2 * MAXSTR - 1] = 0;
sprintf(SockPath + strlen(SockPath), "/%s", sty);
is_socket = IsSocket(SockPath);
if ((s = MakeClientSocket(1, is_socket)) == -1)
exit(1);
debug1("SendCreateMsg() to '%s'\n", SockPath);
bzero((char *)&m, sizeof(m));
m.type = MSG_CREATE;
strncpy(m.m_tty, attach_tty, sizeof(m.m_tty) - 1);
m.m_tty[sizeof(m.m_tty) - 1] = 0;
p = m.m.create.line;
n = 0;
if (nwin->args != nwin_undef.args)
for (av = nwin->args; *av && n < MAXARGS - 1; ++av, ++n)
{
len = strlen(*av) + 1;
if (p + len >= m.m.create.line + sizeof(m.m.create.line) - 1)
break;
strcpy(p, *av);
p += len;
}
if (nwin->aka != nwin_undef.aka && p + strlen(nwin->aka) + 1 < m.m.create.line + sizeof(m.m.create.line))
strcpy(p, nwin->aka);
else
*p = '\0';
m.m.create.nargs = n;
m.m.create.aflag = nwin->aflag;
m.m.create.flowflag = nwin->flowflag;
m.m.create.lflag = nwin->lflag;
m.m.create.hheight = nwin->histheight;
if (getcwd(m.m.create.dir, sizeof(m.m.create.dir)) == 0)
{
Msg(errno, "getcwd");
goto end;
}
if (nwin->term != nwin_undef.term)
strncpy(m.m.create.screenterm, nwin->term, MAXTERMLEN);
m.m.create.screenterm[MAXTERMLEN] = '\0';
m.protocol_revision = MSG_REVISION;
debug1("SendCreateMsg writing '%s'\n", m.m.create.line);
if (write(s, (char *) &m, sizeof m) != sizeof m)
Msg(errno, "write");
end:
close(s);
}
int
SendErrorMsg(tty, buf)
char *tty, *buf;
{
int s;
struct msg m;
bool is_socket;
debug2("SendErrorMsg: %s %s\n", tty, buf);
strncpy(m.m.message, buf, sizeof(m.m.message) - 1);
m.m.message[sizeof(m.m.message) - 1] = 0;
is_socket = IsSocket(SockPath);
s = MakeClientSocket(0, is_socket);
if (s < 0)
return -1;
m.type = MSG_ERROR;
strncpy(m.m_tty, tty, sizeof(m.m_tty) - 1);
m.m_tty[sizeof(m.m_tty) - 1] = 0;
m.protocol_revision = MSG_REVISION;
debug1("SendErrorMsg(): writing to '%s'\n", SockPath);
(void) write(s, (char *) &m, sizeof m);
close(s);
return 0;
}
static void
ExecCreate(mp)
struct msg *mp;
{
struct NewWindow nwin;
char *args[MAXARGS];
register int n;
register char **pp = args, *p = mp->m.create.line;
char buf[20];
nwin = nwin_undef;
n = mp->m.create.nargs;
if (n > MAXARGS - 1)
n = MAXARGS - 1;
/* ugly hack alert... should be done by the frontend! */
if (n)
{
int l, num;
l = strlen(p);
if (IsNumColon(p, 10, buf, sizeof(buf)))
{
if (*buf)
nwin.aka = buf;
num = atoi(p);
if (num < 0 || num > maxwin - 1)
num = 0;
nwin.StartAt = num;
p += l + 1;
n--;
}
}
for (; n > 0; n--)
{
*pp++ = p;
p += strlen(p) + 1;
}
*pp = 0;
if (*p)
nwin.aka = p;
if (*args)
nwin.args = args;
nwin.aflag = mp->m.create.aflag;
nwin.flowflag = mp->m.create.flowflag;
if (*mp->m.create.dir)
nwin.dir = mp->m.create.dir;
nwin.lflag = mp->m.create.lflag;
nwin.histheight = mp->m.create.hheight;
if (*mp->m.create.screenterm)
nwin.term = mp->m.create.screenterm;
MakeWindow(&nwin);
}
static int
CheckPid(pid)
int pid;
{
debug1("Checking pid %d\n", pid);
if (pid < 2)
return -1;
if (eff_uid == real_uid)
return kill(pid, 0);
if (UserContext() > 0)
UserReturn(kill(pid, 0));
return UserStatus();
}
#ifdef hpux
/*
* From: "F. K. Bruner" <napalm@ugcs.caltech.edu>
* From: "Dan Egnor" <egnor@oracorp.com> Tue Aug 10 06:56:45 1993
* The problem is that under HPUX (and possibly other systems too) there are
* two equivalent device files for each pty/tty device:
* /dev/ttyxx == /dev/pty/ttyxx
* /dev/ptyxx == /dev/ptym/ptyxx
* I didn't look into the exact specifics, but I've run across this problem
* before: Even if you open /dev/ttyxx as fds 0 1 & 2 for a process, if that
* process calls the system to determine its tty, it'll get /dev/pty/ttyxx.
*
* Earlier versions seemed to work -- wonder what they did.
*/
static int
ttycmp(s1, s2)
char *s1, *s2;
{
if (strlen(s1) > 5) s1 += strlen(s1) - 5;
if (strlen(s2) > 5) s2 += strlen(s2) - 5;
return strcmp(s1, s2);
}
# define TTYCMP(a, b) ttycmp(a, b)
#else
# define TTYCMP(a, b) strcmp(a, b)
#endif
static int
CreateTempDisplay(m, recvfd, wi)
struct msg *m;
int recvfd;
struct win *wi;
{
int pid;
int attach;
char *user;
int i;
struct mode Mode;
struct display *olddisplays = displays;
switch (m->type)
{
case MSG_CONT:
case MSG_ATTACH:
pid = m->m.attach.apid;
user = m->m.attach.auser;
attach = 1;
break;
#ifdef REMOTE_DETACH
case MSG_DETACH:
# ifdef POW_DETACH
case MSG_POW_DETACH:
# endif /* POW_DETACH */
pid = m->m.detach.dpid;
user = m->m.detach.duser;
attach = 0;
break;
#endif
default:
return -1;
}
if (CheckPid(pid))
{
Msg(0, "Attach attempt with bad pid(%d)!", pid);
return -1;
}
if (recvfd != -1)
{
int ret;
char ttyname_in_ns[MAXPATHLEN];
char *myttyname;
i = recvfd;
recvfd = -1;
memset(&ttyname_in_ns, 0, sizeof(ttyname_in_ns));
errno = 0;
myttyname = GetPtsPathOrSymlink(i);
if (myttyname && errno == ENODEV)
{
ret = readlink(myttyname, ttyname_in_ns, sizeof(ttyname_in_ns));
if (ret < 0 || (size_t)ret >= sizeof(ttyname_in_ns))
{
Msg(errno, "Could not perform necessary sanity checks on pts device.");
close(i);
Kill(pid, SIG_BYE);
return -1;
}
if (strcmp(ttyname_in_ns, m->m_tty))
{
Msg(errno, "Attach: passed fd does not match tty: %s - %s!", ttyname_in_ns, m->m_tty[0] != '\0' ? m->m_tty : "(null)");
close(i);
Kill(pid, SIG_BYE);
return -1;
}
/* m->m_tty so far contains the actual name of the pts device in the
* its (e.g. /dev/pts/0). This name however is not valid in the
* current namespace. So after we verified that the symlink returned
* by GetPtsPathOrSymlink() refers to the same pts device in this
* namespace we need to update m->m_tty to use that symlink for all
* future operations.
*/
strncpy(m->m_tty, myttyname, sizeof(m->m_tty) - 1);
m->m_tty[sizeof(m->m_tty) - 1] = 0;
}
else if (myttyname == 0 || strcmp(myttyname, m->m_tty))
{
Msg(errno, "Attach: passed fd does not match tty: %s - %s!", m->m_tty, myttyname ? myttyname : "NULL");
close(i);
Kill(pid, SIG_BYE);
return -1;
}
}
else if ((i = secopen(m->m_tty, O_RDWR | O_NONBLOCK, 0)) < 0)
{
Msg(errno, "Attach: Could not open %s!", m->m_tty);
Kill(pid, SIG_BYE);
return -1;
}
#ifdef MULTIUSER
if (attach)
Kill(pid, SIGCONT);
#endif
#if defined(ultrix) || defined(pyr) || defined(NeXT)
brktty(i); /* for some strange reason this must be done */
#endif
if (attach)
{
if (display || wi)
{
write(i, "Attaching from inside of screen?\n", 33);
close(i);
Kill(pid, SIG_BYE);
Msg(0, "Attach msg ignored: coming from inside.");
return -1;
}
#ifdef MULTIUSER
if (strcmp(user, LoginName))
if (*FindUserPtr(user) == 0)
{
write(i, "Access to session denied.\n", 26);
close(i);
Kill(pid, SIG_BYE);
Msg(0, "Attach: access denied for user %s.", user);
return -1;
}
#endif
debug2("RecMsg: apid %d is o.k. and we just opened '%s'\n", pid, m->m_tty);
#ifndef MULTI
if (displays)
{
write(i, "Screen session in use.\n", 23);
close(i);
Kill(pid, SIG_BYE);
return -1;
}
#endif
}
/* create new display */
GetTTY(i, &Mode);
if (MakeDisplay(user, m->m_tty, attach ? m->m.attach.envterm : "", i, pid, &Mode) == 0)
{
write(i, "Could not make display.\n", 24);
close(i);
Msg(0, "Attach: could not make display for user %s", user);
Kill(pid, SIG_BYE);
return -1;
}
#ifdef ENCODINGS
if (attach)
{
# ifdef UTF8
D_encoding = m->m.attach.encoding == 1 ? UTF8 : m->m.attach.encoding ? m->m.attach.encoding - 1 : 0;
# else
D_encoding = m->m.attach.encoding ? m->m.attach.encoding - 1 : 0;
# endif
if (D_encoding < 0 || !EncodingName(D_encoding))
D_encoding = 0;
}
#endif
if (iflag && olddisplays)
{
iflag = 0;
#if defined(TERMIO) || defined(POSIX)
olddisplays->d_NewMode.tio.c_cc[VINTR] = VDISABLE;
olddisplays->d_NewMode.tio.c_lflag &= ~ISIG;
#else /* TERMIO || POSIX */
olddisplays->d_NewMode.m_tchars.t_intrc = -1;
#endif /* TERMIO || POSIX */
SetTTY(olddisplays->d_userfd, &olddisplays->d_NewMode);
}
SetMode(&D_OldMode, &D_NewMode, D_flow, iflag);
SetTTY(D_userfd, &D_NewMode);
if (fcntl(D_userfd, F_SETFL, FNBLOCK))
Msg(errno, "Warning: NBLOCK fcntl failed");
return 0;
}
void
ReceiveMsg()
{
int left, len;
static struct msg m;
char *p;
int ns = ServerSocket;
struct win *wi;
int recvfd = -1;
struct acluser *user;
bool is_socket;
/* Socket specific variables. */
struct sockaddr_un a;
struct msghdr msg;
struct iovec iov;
char control[1024];
is_socket = IsSocket(SockPath);
if (!is_socket)
{
debug("Ha, there was someone knocking on my fifo??\n");
if (fcntl(ServerSocket, F_SETFL, 0) == -1)
Panic(errno, "BLOCK fcntl");
p = (char *)&m;
left = sizeof(m);
}
else
{
len = sizeof(a);
debug("Ha, there was someone knocking on my socket??\n");
if ((ns = accept(ns, (struct sockaddr *)&a, (void *)&len)) < 0)
{
Msg(errno, "accept");
return;
}
p = (char *)&m;
left = sizeof(m);
bzero(&msg, sizeof(msg));
iov.iov_base = &m;
iov.iov_len = left;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_controllen = sizeof(control);
msg.msg_control = &control;
while (left > 0)
{
len = recvmsg(ns, &msg, 0);
if (len < 0 && errno == EINTR)
continue;
if (len < 0)
{
close(ns);
Msg(errno, "read");
return;
}
if (msg.msg_controllen)
{
struct cmsghdr *cmsg;
for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
cmsg = CMSG_NXTHDR(&msg, cmsg))
{
int cl;
char *cp;
if (cmsg->cmsg_level != SOL_SOCKET ||
cmsg->cmsg_type != SCM_RIGHTS)
continue;
cp = (char *)CMSG_DATA(cmsg);
cl = cmsg->cmsg_len;
while (cl >= CMSG_LEN(sizeof(int)))
{
int passedfd;
bcopy(cp, &passedfd, sizeof(int));
if (recvfd >= 0 && passedfd != recvfd)
close(recvfd);
recvfd = passedfd;
cl -= CMSG_LEN(sizeof(int));
}
}
}
p += len;
left -= len;
break;
}
}
while (left > 0)
{
len = read(ns, p, left);
if (len < 0 && errno == EINTR)
continue;
if (len <= 0)
break;
p += len;
left -= len;
}
if (!is_socket)
{
#ifndef BROKEN_PIPE
/* Reopen pipe to prevent EOFs at the select() call */
close(ServerSocket);
if ((ServerSocket = secopen(SockPath, O_RDONLY | O_NONBLOCK, 0)) < 0)
Panic(errno, "reopen fifo %s", SockPath);
evdeq(&serv_read);
serv_read.fd = ServerSocket;
evenq(&serv_read);
#endif
}
else
{
close(ns);
}
if (len < 0)
{
Msg(errno, "read");
if (recvfd != -1)
close(recvfd);
return;
}
if (left > 0)
{
if (left != sizeof(m))
Msg(0, "Message %d of %d bytes too small", left, (int)sizeof(m));
else
debug("No data on socket.\n");
return;
}
if (m.protocol_revision != MSG_REVISION)
{
if (recvfd != -1)
close(recvfd);
Msg(0, "Invalid message (magic 0x%08x).", m.protocol_revision);
return;
}
debug2("*** RecMsg: type %d tty %s\n", m.type, m.m_tty);
if (m.type != MSG_ATTACH && recvfd != -1)
{
close(recvfd);
recvfd = -1;
}
for (display = displays; display; display = display->d_next)
if (TTYCMP(D_usertty, m.m_tty) == 0)
break;
debug2("display: %s display %sfound\n", m.m_tty, display ? "" : "not ");
wi = 0;
if (!display)
{
for (wi = windows; wi; wi = wi->w_next)
if (!TTYCMP(m.m_tty, wi->w_tty))
{
/* XXX: hmmm, rework this? */
display =
wi->w_layer.l_cvlist ? wi->w_layer.l_cvlist->c_display : 0;
debug2("but window %s %sfound.\n", m.m_tty,
display ? "" : "(backfacing)");
break;
}
}
/* Remove the status to prevent garbage on the screen */
if (display && D_status)
RemoveStatus();
if (display && !D_tcinited && m.type != MSG_HANGUP)
{
if (recvfd != -1)
close(recvfd);
return; /* ignore messages for bad displays */
}
switch (m.type)
{
case MSG_WINCH:
if (display)
CheckScreenSize(1); /* Change fore */
break;
case MSG_CREATE:
/*
* the window that issued the create message need not be an
* active
* window. Then we create the window without having a display.
* Resulting in another inactive window.
*/
ExecCreate(&m);
break;
case MSG_CONT:
if (display && D_userpid != 0 && kill(D_userpid, 0) == 0)
break; /* Intruder Alert */
debug2("RecMsg: apid=%d,was %d\n", m.m.attach.apid,
display ? D_userpid : 0);
/* FALLTHROUGH */
case MSG_ATTACH:
if (CreateTempDisplay(&m, recvfd, wi))
break;
#ifdef PASSWORD
if (D_user->u_password && *D_user->u_password)
AskPassword(&m);
else
#endif
FinishAttach(&m);
break;
case MSG_ERROR:
{
int blocked=D_blocked;
if(D_blocked == 4) /* allow error messages while in blanker mode */
D_blocked=0; /* likely they're from failed blanker */
Msg(0, "%s", m.m.message);
D_blocked=blocked;
}
break;
case MSG_HANGUP:
if (!wi) /* ignore hangups from inside */
Hangup();
break;
#ifdef REMOTE_DETACH
case MSG_DETACH:
#ifdef POW_DETACH
case MSG_POW_DETACH:
#endif /* POW_DETACH */
#ifdef PASSWORD
user = *FindUserPtr(m.m.detach.duser);
if (user && user->u_password && *user->u_password)
{
if (CreateTempDisplay(&m, recvfd, 0))
break;
AskPassword(&m);
}
else
#endif /* PASSWORD */
FinishDetach(&m);
break;
#endif
case MSG_QUERY:
{
char *oldSockPath = SaveStr(SockPath);
strcpy(SockPath, m.m.command.writeback);
bool is_socket = IsSocket(SockPath);
int s = MakeClientSocket(0, is_socket);
strcpy(SockPath, oldSockPath);
Free(oldSockPath);
if (s >= 0)
{
queryflag = s;
DoCommandMsg(&m);
close(s);
}
else
queryflag = -1;
if (CheckPid(m.m.command.apid)) {
Msg(0, "Query attempt with bad pid(%d)!", m.m.command.apid);
}
else {
Kill(m.m.command.apid,
(queryflag >= 0)
? SIGCONT
: SIG_BYE); /* Send SIG_BYE if an error happened */
queryflag = -1;
}
}
break;
case MSG_COMMAND:
DoCommandMsg(&m);
break;
default:
Msg(0, "Invalid message (type %d).", m.type);
}
}
void
ReceiveRaw(s)
int s;
{
char rd[256];
int len = 0;
struct sockaddr_un a;
bool is_socket;
is_socket = IsSocket(SockPath);
if (!is_socket)
{
if (fcntl(s, F_SETFL, 0) < 0)
Panic(errno, "BLOCK fcntl");
}
else
{
len = sizeof(a);
s = accept(s, (struct sockaddr *)&a, (void *)&len);
if (s < 0)
{
Msg(errno, "accept");
return;
}
}
while ((len = read(s, rd, 255)) > 0)
{
rd[len] = 0;
printf("%s", rd);
}
close(s);
}
#if defined(_SEQUENT_)
#undef connect
/*
* sequent_ptx socket emulation must have mode 000 on the socket!
*/
static int
sconnect(s, sapp, len)
int s, len;
struct sockaddr *sapp;
{
register struct sockaddr_un *sap;
struct stat st;
int x;
sap = (struct sockaddr_un *)sapp;
if (stat(sap->sun_path, &st))
return -1;
chmod(sap->sun_path, 0);
x = connect(s, (struct sockaddr *) sap, len);
chmod(sap->sun_path, st.st_mode);
return x;
}
#endif
/*
* Set the mode bits of the socket to the current status
*/
int
chsock()
{
int r, euid = geteuid();
if (euid != real_uid)
{
if (UserContext() <= 0)
return UserStatus();
}
r = chmod(SockPath, SOCKMODE);
/*
* Sockets usually reside in the /tmp/ area, where sysadmin scripts
* may be happy to remove old files. We manually prevent the socket
* from becoming old. (chmod does not touch mtime).
*/
(void)utimes(SockPath, NULL);
if (euid != real_uid)
UserReturn(r);
return r;
}
/*
* Try to recreate the socket/pipe
*/
int
RecoverSocket()
{
bool is_socket;
close(ServerSocket);
if ((int)geteuid() != real_uid)
{
if (UserContext() > 0)
UserReturn(unlink(SockPath));
(void)UserStatus();
}
else
(void) unlink(SockPath);
is_socket = IsSocket(SockPath);
if ((ServerSocket = MakeServerSocket(is_socket)) < 0)
return 0;
evdeq(&serv_read);
serv_read.fd = ServerSocket;
evenq(&serv_read);
return 1;
}
static void
FinishAttach(m)
struct msg *m;
{
char *p;
int pid;
int noshowwin;
struct win *wi;
ASSERT(display);
pid = D_userpid;
#ifdef REMOTE_DETACH
if (m->m.attach.detachfirst == MSG_DETACH
# ifdef POW_DETACH
|| m->m.attach.detachfirst == MSG_POW_DETACH
# endif
)
FinishDetach(m);
#endif
#if defined(pyr) || defined(xelos) || defined(sequent)
/*
* Kludge for systems with braindamaged termcap routines,
* which evaluate $TERMCAP, regardless whether it describes
* the correct terminal type or not.
*/
debug("unsetenv(TERMCAP) in case of a different terminal");
unsetenv("TERMCAP");
#endif
/*
* We reboot our Terminal Emulator. Forget all we knew about
* the old terminal, reread the termcap entries in .screenrc
* (and nothing more from .screenrc is read. Mainly because
* I did not check, whether a full reinit is safe. jw)
* and /etc/screenrc, and initialise anew.
*/
if (extra_outcap)
free(extra_outcap);
if (extra_incap)
free(extra_incap);
extra_incap = extra_outcap = 0;
debug2("Message says size (%dx%d)\n", m->m.attach.columns, m->m.attach.lines);
#ifdef ETCSCREENRC
# ifdef ALLOW_SYSSCREENRC
if ((p = getenv("SYSSCREENRC")))
StartRc(p, 1);
else
# endif
StartRc(ETCSCREENRC, 1);
#endif
StartRc(RcFileName, 1);
if (InitTermcap(m->m.attach.columns, m->m.attach.lines))
{
FreeDisplay();
Kill(pid, SIG_BYE);
return;
}
MakeDefaultCanvas();
InitTerm(m->m.attach.adaptflag); /* write init string on fd */
if (displays->d_next == 0)
(void) chsock();
signal(SIGHUP, SigHup);
if (m->m.attach.esc != -1 && m->m.attach.meta_esc != -1)
{
D_user->u_Esc = m->m.attach.esc;
D_user->u_MetaEsc = m->m.attach.meta_esc;
}
#ifdef UTMPOK
/*
* we set the Utmp slots again, if we were detached normally
* and if we were detached by ^Z.
* don't log zomies back in!
*/
RemoveLoginSlot();
if (displays->d_next == 0)
for (wi = windows; wi; wi = wi->w_next)
if (wi->w_ptyfd >= 0 && wi->w_slot != (slot_t) -1)
SetUtmp(wi);
#endif
D_fore = NULL;
if (layout_attach)
{
struct layout *lay = layout_attach;
if (lay == &layout_last_marker)
lay = layout_last;
if (lay)
{
LoadLayout(lay, &D_canvas);
SetCanvasWindow(D_forecv, 0);
}
}
/*
* there may be a window that we remember from last detach:
*/
debug1("D_user->u_detachwin = %d\n", D_user->u_detachwin);
if (D_user->u_detachwin >= 0)
fore = wtab[D_user->u_detachwin];
else
fore = 0;
/* Wayne wants us to restore the other window too. */
if (D_user->u_detachotherwin >= 0)
D_other = wtab[D_user->u_detachotherwin];
noshowwin = 0;
if (*m->m.attach.preselect)
{
if (!strcmp(m->m.attach.preselect, "="))
fore = 0;
else if (!strcmp(m->m.attach.preselect, "-"))
{
fore = 0;
noshowwin = 1;
}
else if (!strcmp(m->m.attach.preselect, "+"))
{
struct action newscreen;
char *na = 0;
newscreen.nr = RC_SCREEN;
newscreen.args = &na;
newscreen.quiet = 0;
DoAction(&newscreen, -1);
}
else
fore = FindNiceWindow(fore, m->m.attach.preselect);
}
else
fore = FindNiceWindow(fore, 0);
if (fore)
SetForeWindow(fore);
else if (!noshowwin)
{
#ifdef MULTIUSER
if (!AclCheckPermCmd(D_user, ACL_EXEC, &comms[RC_WINDOWLIST]))
#endif
{
struct display *olddisplay = display;
flayer = D_forecv->c_layer;
display_windows(1, WLIST_NUM, (struct win *)0);
noshowwin = 1;
display = olddisplay; /* display_windows can change display */
}
}
Activate(0);
ResetIdle();
if (!D_fore && !noshowwin)
ShowWindows(-1);
if (displays->d_next == 0 && console_window)
{
if (TtyGrabConsole(console_window->w_ptyfd, 1, "reattach") == 0)
Msg(0, "console %s is on window %d", HostName, console_window->w_number);
}
debug("activated...\n");
# if defined(DEBUG) && defined(SIG_NODEBUG)
if (!dfp)
{
sleep(1);
debug1("Attacher %d must not debug, as we have debug off.\n", pid);
kill(pid, SIG_NODEBUG);
}
# endif /* SIG_NODEBUG */
}
static void
FinishDetach(m)
struct msg *m;
{
struct display *next, **d, *det;
int pid;
if (m->type == MSG_ATTACH)
pid = D_userpid;
else
pid = m->m.detach.dpid;
/* Remove the temporary display prompting for the password from the list */
for (d = &displays; (det = *d); d = &det->d_next)
{
if (det->d_userpid == pid)
break;
}
if (det)
{
*d = det->d_next;
det->d_next = 0;
}
for (display = displays; display; display = next)
{
next = display->d_next;
# ifdef POW_DETACH
if (m->type == MSG_POW_DETACH)
Detach(D_REMOTE_POWER);
else
# endif /* POW_DETACH */
if (m->type == MSG_DETACH)
Detach(D_REMOTE);
else if (m->type == MSG_ATTACH)
{
#ifdef POW_DETACH
if (m->m.attach.detachfirst == MSG_POW_DETACH)
Detach(D_REMOTE_POWER);
else
#endif
if (m->m.attach.detachfirst == MSG_DETACH)
Detach(D_REMOTE);
}
}
display = displays = det;
if (m->type != MSG_ATTACH)
{
if (display)
FreeDisplay();
Kill(pid, SIGCONT);
}
}
#ifdef PASSWORD
static void PasswordProcessInput __P((char *, int));
struct pwdata {
int l;
char buf[MAXLOGINLEN + 1];
struct msg m;
};
static void
AskPassword(m)
struct msg *m;
{
struct pwdata *pwdata;
ASSERT(display);
pwdata = (struct pwdata *)malloc(sizeof(struct pwdata));
if (!pwdata)
Panic(0, "%s", strnomem);
pwdata->l = 0;
pwdata->m = *m;
D_processinputdata = (char *)pwdata;
D_processinput = PasswordProcessInput;
AddStr("Screen password: ");
}
static void
PasswordProcessInput(ibuf, ilen)
char *ibuf;
int ilen;
{
struct pwdata *pwdata;
int c, l;
char *up;
int pid = D_userpid;
pwdata = (struct pwdata *)D_processinputdata;
l = pwdata->l;
while (ilen-- > 0)
{
c = *(unsigned char *)ibuf++;
if (c == '\r' || c == '\n')
{
char *buf = NULL;
up = D_user->u_password;
pwdata->buf[l] = 0;
buf = crypt(pwdata->buf, up);
if (!buf || strncmp(buf, up, strlen(up)))
{
/* uh oh, user failed */
bzero(pwdata->buf, sizeof(pwdata->buf));
if (!buf)
AddStr("\r\ncrypt() failed.\r\n");
else
AddStr("\r\nPassword incorrect.\r\n");
D_processinputdata = 0; /* otherwise freed by FreeDis */
FreeDisplay();
Msg(0, "Illegal reattach attempt from terminal %s.", pwdata->m.m_tty);
free(pwdata);
Kill(pid, SIG_BYE);
return;
}
/* great, pw matched, all is fine */
bzero(pwdata->buf, sizeof(pwdata->buf));
AddStr("\r\n");
D_processinputdata = 0;
D_processinput = ProcessInput;
#ifdef REMOTE_DETACH
if (pwdata->m.type == MSG_DETACH
# ifdef POW_DETACH
|| pwdata->m.type == MSG_POW_DETACH
# endif
)
FinishDetach(&pwdata->m);
else
#endif
FinishAttach(&pwdata->m);
free(pwdata);
return;
}
if (c == Ctrl('c'))
{
AddStr("\r\n");
FreeDisplay();
Kill(pid, SIG_BYE);
return;
}
if (c == '\b' || c == 0177)
{
if (l > 0)
l--;
continue;
}
if (c == Ctrl('u'))
{
l = 0;
continue;
}
if (l < (int)sizeof(pwdata->buf) - 1)
pwdata->buf[l++] = c;
}
pwdata->l = l;
}
#endif
/* 'end' is exclusive, i.e. you should *not* write in *end */
static char *
strncpy_escape_quote(dst, src, end)
char *dst;
const char *src, *end;
{
while (*src && dst < end)
{
if (*src == '"')
{
if (dst + 2 < end) /* \\ \" \0 */
*dst++ = '\\';
else
return NULL;
}
*dst++ = *src++;
}
if (dst >= end)
return NULL;
*dst = '\0';
return dst;
}
static void
DoCommandMsg(mp)
struct msg *mp;
{
char *args[MAXARGS];
int argl[MAXARGS];
char fullcmd[MAXSTR];
register char *fc;
int n;
register char *p = mp->m.command.cmd;
struct acluser *user;
#ifdef MULTIUSER
extern struct acluser *EffectiveAclUser; /* acls.c */
#else
extern struct acluser *users; /* acls.c */
#endif
n = mp->m.command.nargs;
if (n > MAXARGS - 1)
n = MAXARGS - 1;
for (fc = fullcmd; n > 0; n--)
{
int len = strlen(p);
*fc++ = '"';
if (!(fc = strncpy_escape_quote(fc, p, fullcmd + sizeof(fullcmd) - 2))) /* '"' ' ' */
{
Msg(0, "Remote command too long.");
queryflag = -1;
return;
}
p += len + 1;
*fc++ = '"';
*fc++ = ' ';
}
if (fc != fullcmd)
*--fc = 0;
if (Parse(fullcmd, sizeof fullcmd, args, argl) <= 0)
{
queryflag = -1;
return;
}
#ifdef MULTIUSER
user = *FindUserPtr(mp->m.attach.auser);
if (user == 0)
{
Msg(0, "Unknown user %s tried to send a command!", mp->m.attach.auser);
queryflag = -1;
return;
}
#else
user = users;
#endif
#ifdef PASSWORD
if (user->u_password && *user->u_password)
{
Msg(0, "User %s has a password, cannot use remote commands (using -Q or -X option).", mp->m.attach.auser);
queryflag = -1;
return;
}
#endif
if (!display)
for (display = displays; display; display = display->d_next)
if (D_user == user)
break;
for (fore = windows; fore; fore = fore->w_next)
if (!TTYCMP(mp->m_tty, fore->w_tty))
{
if (!display)
display = fore->w_layer.l_cvlist ? fore->w_layer.l_cvlist->c_display : 0;
/* If the window is not visibile in any display, then do not use the originating window as
* the foreground window for the command. This way, if there is an existing display, then
* the command will execute from the foreground window of that display. This is necessary so
* that commands that are relative to the window (e.g. 'next' etc.) do the right thing. */
if (!fore->w_layer.l_cvlist || !fore->w_layer.l_cvlist->c_display)
fore = NULL;
break;
}
if (!display)
display = displays; /* sigh */
if (*mp->m.command.preselect)
{
int i = -1;
if (strcmp(mp->m.command.preselect, "-"))
{
i = WindowByNoN(mp->m.command.preselect);
if (i < 0 || !wtab[i])
{
Msg(0, "Could not find pre-select window.");
queryflag = -1;
return;
}
}
fore = i >= 0 ? wtab[i] : 0;
}
else if (!fore)
{
if (display && D_user == user)
fore = Layer2Window(display->d_forecv->c_layer);
if (!fore)
{
fore = user->u_detachwin >= 0 ? wtab[user->u_detachwin] : 0;
fore = FindNiceWindow(fore, 0);
}
}
if (!fore)
fore = windows; /* sigh */
#ifdef MULTIUSER
EffectiveAclUser = user;
#endif
if (*args)
{
char *oldrcname = rc_name;
rc_name = "-X";
debug3("Running command on display %lx window %lx (%d)\n", (long)display, (long)fore, fore ? fore->w_number : -1);
flayer = fore ? &fore->w_layer : 0;
if (fore && fore->w_savelayer && (fore->w_blocked || fore->w_savelayer->l_cvlist == 0))
flayer = fore->w_savelayer;
DoCommand(args, argl);
rc_name = oldrcname;
}
#ifdef MULTIUSER
EffectiveAclUser = 0;
#endif
}
int
SendAttachMsg(s, m, fd)
int s;
struct msg *m;
int fd;
{
int r;
struct msghdr msg;
struct iovec iov;
char buf[CMSG_SPACE(sizeof(int))];
struct cmsghdr *cmsg;
iov.iov_base = (char *)m;
iov.iov_len = sizeof(*m);
bzero(&msg, sizeof(msg));
msg.msg_name = 0;
msg.msg_namelen = 0;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
bcopy(&fd, CMSG_DATA(cmsg), sizeof(int));
msg.msg_controllen = cmsg->cmsg_len;
while(1)
{
r = sendmsg(s, &msg, 0);
if (r == -1 && errno == EINTR)
continue;
if (r == -1)
return -1;
return 0;
}
}
bool
IsSocket(path)
const char *path;
{
struct stat st;
if (stat(path, &st) < 0)
return false;
return S_ISSOCK(st.st_mode);
}
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