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This commit is contained in:
Martin Baulig
1998-06-14 14:09:34 +00:00
parent 794a8efaed
commit 215ab9f17b
3 changed files with 1753 additions and 0 deletions
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620
src/daemon/gnuclient.c Normal file
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/* -*-C-*-
Client code to allow local and remote editing of files by XEmacs.
Copyright (C) 1989 Free Software Foundation, Inc.
Copyright (C) 1995 Sun Microsystems, Inc.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of XEmacs.
XEmacs 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 2, or (at your option) any
later version.
XEmacs 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 XEmacs; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
Author: Andy Norman (ange@hplb.hpl.hp.com), based on
'etc/emacsclient.c' from the GNU Emacs 18.52 distribution.
Please mail bugs and suggestions to the author at the above address.
*/
/*
* This file incorporates new features added by Bob Weiner <weiner@mot.com>,
* Darrell Kindred <dkindred@cmu.edu> and Arup Mukherjee <arup@cmu.edu>.
* GNUATTACH support added by Ben Wing <wing@xemacs.org>.
* Please see the note at the end of the README file for details.
*
* (If gnuserv came bundled with your emacs, the README file is probably
* ../etc/gnuserv.README relative to the directory containing this file)
*/
#if 0
/* Hand-munged RCS header */
static char rcsid [] = "!Header: gnuclient.c,v 2.2 95/12/12 01:39:21 wing nene !";
#endif
#include "gnuserv.h"
#include "getopt.h"
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <signal.h>
#if !defined(SYSV_IPC) && !defined(UNIX_DOMAIN_SOCKETS) && \
!defined(INTERNET_DOMAIN_SOCKETS)
int
main (int argc, char *argv[])
{
fprintf (stderr, "Sorry, the Emacs server is only "
"supported on systems that have\n");
fprintf (stderr, "Unix Domain sockets, Internet Domain "
"sockets or System V IPC.\n");
exit (1);
} /* main */
#else /* SYSV_IPC || UNIX_DOMAIN_SOCKETS || INTERNET_DOMAIN_SOCKETS */
static char cwd[MAXPATHLEN+2]; /* current working directory when calculated */
static char *cp = NULL; /* ptr into valid bit of cwd above */
static pid_t emacs_pid; /* Process id for emacs process */
void initialize_signals (void);
static void
tell_emacs_to_resume (int sig)
{
char buffer[GSERV_BUFSZ+1];
int s; /* socket / msqid to server */
int connect_type; /* CONN_UNIX, CONN_INTERNET, or
ONN_IPC */
/* Why is SYSV so retarded? */
/* We want emacs to realize that we are resuming */
signal(SIGCONT, tell_emacs_to_resume);
connect_type = make_connection (NULL, (u_short) 0, &s);
sprintf(buffer,"(gnuserv-eval '(resume-pid-console %d))", (int)getpid());
send_string(s, buffer);
#ifdef SYSV_IPC
if (connect_type == (int) CONN_IPC)
disconnect_from_ipc_server (s, msgp, FALSE);
#else /* !SYSV_IPC */
if (connect_type != (int) CONN_IPC)
disconnect_from_server (s, FALSE);
#endif /* !SYSV_IPC */
}
static void
pass_signal_to_emacs (int sig)
{
if (kill (emacs_pid, sig) == -1)
{
fprintf (stderr, "gnuattach: Could not pass signal to emacs process\n");
exit (1);
}
initialize_signals ();
}
void
initialize_signals ()
{
/* Set up signal handler to pass relevant signals to emacs process.
We used to send SIGSEGV, SIGBUS, SIGPIPE, SIGILL and others to
Emacs, but I think it's better not to. I can see no reason why
Emacs should SIGSEGV whenever gnuclient SIGSEGV-s, etc. */
signal (SIGHUP, pass_signal_to_emacs);
signal (SIGQUIT, pass_signal_to_emacs);
signal (SIGINT, pass_signal_to_emacs);
#ifdef SIGWINCH
signal (SIGWINCH, pass_signal_to_emacs);
#endif
/* We want emacs to realize that we are resuming */
signal (SIGCONT, tell_emacs_to_resume);
}
/*
get_current_working_directory -- return the cwd.
*/
static char *
get_current_working_directory (void)
{
if (cp == NULL)
{ /* haven't calculated it yet */
#ifdef BSD
if (getwd (cwd) == 0)
#else /* !BSD */
if (getcwd (cwd,MAXPATHLEN) == NULL)
#endif /* !BSD */
{
perror (progname);
fprintf (stderr, "%s: unable to get current working directory\n",
progname);
exit (1);
} /* if */
/* on some systems, cwd can look like '@machine/' ... */
/* ignore everything before the first '/' */
for (cp = cwd; *cp && *cp != '/'; ++cp)
;
} /* if */
return cp;
} /* get_current_working_directory */
/*
filename_expand -- try to convert the given filename into a fully-qualified
pathname.
*/
static void
filename_expand (char *fullpath, char *filename)
/* fullpath - returned full pathname */
/* filename - filename to expand */
{
int len;
fullpath[0] = '\0';
if (filename[0] && filename[0] != '/')
{ /* relative filename */
strcat (fullpath, get_current_working_directory ());
len = strlen (fullpath);
if (len > 0 && fullpath[len-1] == '/') /* trailing slash already? */
; /* yep */
else
strcat (fullpath, "/"); /* nope, append trailing slash */
} /* if */
strcat (fullpath,filename);
} /* filename_expand */
/* Encase the string in quotes, escape all the backslashes and quotes
in string. */
static char *
clean_string (CONST char *s)
{
int i = 0;
char *p, *res;
for (p = s; *p; p++, i++)
{
if (*p == '\\' || *p == '\"')
++i;
else if (*p == '\004')
i += 3;
}
p = res = (char *)malloc (i + 2 + 1);
*p++ = '\"';
for (; *s; p++, s++)
{
switch (*s)
{
case '\\':
*p++ = '\\';
*p = '\\';
break;
case '\"':
*p++ = '\\';
*p = '\"';
break;
case '\004':
*p++ = '\\';
*p++ = 'C';
*p++ = '-';
*p = 'd';
break;
default:
*p = *s;
}
}
*p++ = '\"';
*p = '\0';
return res;
}
#define GET_ARGUMENT(var, desc) do { \
if (*(p + 1)) (var) = p + 1; \
else \
{ \
if (!argv[++i]) \
{ \
fprintf (stderr, "%s: `%s' must be followed by an argument\n", \
progname, desc); \
exit (1); \
} \
(var) = argv[i]; \
} \
over = 1; \
} while (0)
/* A strdup immitation. */
static char *
my_strdup (CONST char *s)
{
char *new = malloc (strlen (s) + 1);
if (new)
strcpy (new, s);
return new;
}
int
main (int argc, char *argv[])
{
int starting_line = 1; /* line to start editing at */
char command[MAXPATHLEN+50]; /* emacs command buffer */
char fullpath[MAXPATHLEN+1]; /* full pathname to file */
char *eval_form = NULL; /* form to evaluate with `-eval' */
char *eval_function = NULL; /* function to evaluate with `-f' */
char *load_library = NULL; /* library to load */
int quick = 0; /* quick edit, don't wait for user to
finish */
int batch = 0; /* batch mode */
int view = 0; /* view only. */
int nofiles = 0;
int errflg = 0; /* option error */
int s; /* socket / msqid to server */
int connect_type; /* CONN_UNIX, CONN_INTERNET, or
* CONN_IPC */
int suppress_windows_system = 0;
char *display = NULL;
#ifdef INTERNET_DOMAIN_SOCKETS
char *hostarg = NULL; /* remote hostname */
char *remotearg;
char thishost[HOSTNAMSZ]; /* this hostname */
char remotepath[MAXPATHLEN+1]; /* remote pathname */
char *path;
int rflg = 0; /* pathname given on cmdline */
char *portarg;
u_short port = 0; /* port to server */
#endif /* INTERNET_DOMAIN_SOCKETS */
#ifdef SYSV_IPC
struct msgbuf *msgp; /* message */
#endif /* SYSV_IPC */
char *tty = NULL;
char buffer[GSERV_BUFSZ + 1]; /* buffer to read pid */
char result[GSERV_BUFSZ + 1];
int i;
#ifdef INTERNET_DOMAIN_SOCKETS
memset (remotepath, 0, sizeof (remotepath));
#endif /* INTERNET_DOMAIN_SOCKETS */
progname = strrchr (argv[0], '/');
if (progname)
++progname;
else
progname = argv[0];
display = getenv ("DISPLAY");
if (!display)
suppress_windows_system = 1;
else
display = my_strdup (display);
for (i = 1; argv[i] && !errflg; i++)
{
if (*argv[i] != '-')
break;
else if (*argv[i] == '-'
&& (*(argv[i] + 1) == '\0'
|| (*(argv[i] + 1) == '-' && *(argv[i] + 2) == '\0')))
{
/* `-' or `--' */
++i;
break;
}
if (!strcmp (argv[i], "-batch") || !strcmp (argv[i], "--batch"))
batch = 1;
else if (!strcmp (argv[i], "-eval") || !strcmp (argv[i], "--eval"))
{
if (!argv[++i])
{
fprintf (stderr, "%s: `-eval' must be followed by an argument\n",
progname);
exit (1);
}
eval_form = argv[i];
}
else if (!strcmp (argv[i], "-display") || !strcmp (argv[i], "--display"))
{
suppress_windows_system = 0;
if (!argv[++i])
{
fprintf (stderr,
"%s: `-display' must be followed by an argument\n",
progname);
exit (1);
}
if (display)
free (display);
/* no need to strdup. */
display = argv[i];
}
else if (!strcmp (argv[i], "-nw"))
suppress_windows_system = 1;
else
{
/* Iterate over one-letter options. */
char *p;
int over = 0;
for (p = argv[i] + 1; *p && !over; p++)
{
switch (*p)
{
case 'q':
quick = 1;
break;
case 'v':
view = 1;
break;
case 'f':
GET_ARGUMENT (eval_function, "-f");
break;
case 'l':
GET_ARGUMENT (load_library, "-l");
break;
#ifdef INTERNET_DOMAIN_SOCKETS
case 'h':
GET_ARGUMENT (hostarg, "-h");
break;
case 'p':
GET_ARGUMENT (portarg, "-p");
port = atoi (portarg);
break;
case 'r':
GET_ARGUMENT (remotearg, "-r");
strcpy (remotepath, remotearg);
rflg = 1;
break;
#endif /* INTERNET_DOMAIN_SOCKETS */
default:
errflg = 1;
}
} /* for */
} /* else */
} /* for */
if (errflg)
{
fprintf (stderr,
#ifdef INTERNET_DOMAIN_SOCKETS
"usage: %s [-nw] [-display display] [-q] [-v] [-l library]\n"
" [-batch] [-f function] [-eval form]\n"
" [-h host] [-p port] [-r remote-path] [[+line] file] ...\n",
#else /* !INTERNET_DOMAIN_SOCKETS */
"usage: %s [-nw] [-q] [-v] [-l library] [-f function] [-eval form] "
"[[+line] path] ...\n",
#endif /* !INTERNET_DOMAIN_SOCKETS */
progname);
exit (1);
}
if (batch && argv[i])
{
fprintf (stderr, "%s: Cannot specify `-batch' with file names\n",
progname);
exit (1);
}
if (suppress_windows_system && hostarg)
{
fprintf (stderr, "%s: Remote editing is available only on X\n",
progname);
exit (1);
}
*result = '\0';
if (eval_function || eval_form || load_library)
{
#if defined(INTERNET_DOMAIN_SOCKETS)
connect_type = make_connection (hostarg, port, &s);
#else
connect_type = make_connection (NULL, (u_short) 0, &s);
#endif
sprintf (command, "(gnuserv-eval%s '(progn ", quick ? "-quickly" : "");
send_string (s, command);
if (load_library)
{
sprintf (command, " (load-library %s)", clean_string (load_library));
send_string (s, command);
}
if (eval_form)
{
sprintf (command, " %s", eval_form);
send_string (s, command);
}
if (eval_function)
{
sprintf (command, " (%s)", eval_function);
send_string (s, command);
}
send_string (s, "))");
send_string (s, EOT_STR);
if (read_line (s, result) == 0)
{
fprintf (stderr, "%s: Could not read\n", progname);
exit (1);
}
} /* eval_function || eval_form || load_library */
else if (batch)
{
fprintf (stderr, "%s: `-batch' requires an evaluation\n",
progname);
exit (1);
}
if (!batch)
{
if (suppress_windows_system)
{
tty = ttyname (0);
if (!tty)
{
fprintf (stderr, "%s: Not connected to a tty", progname);
exit (1);
}
#if defined(INTERNET_DOMAIN_SOCKETS)
connect_type = make_connection (hostarg, port, &s);
#else
connect_type = make_connection (NULL, (u_short) 0, &s);
#endif
send_string (s, "(gnuserv-eval '(emacs-pid))");
send_string (s, EOT_STR);
if (read_line (s, buffer) == 0)
{
fprintf (stderr, "%s: Could not establish Emacs procces id\n",
progname);
exit (1);
}
/* Don't do disconnect_from_server becasue we have already read
data, and disconnect doesn't do anything else. */
#ifndef INTERNET_DOMAIN_SOCKETS
if (connect_type == (int) CONN_IPC)
disconnect_from_ipc_server (s, msgp, FALSE);
#endif /* !SYSV_IPC */
emacs_pid = (pid_t)atol(buffer);
initialize_signals();
} /* suppress_windows_system */
#if defined(INTERNET_DOMAIN_SOCKETS)
connect_type = make_connection (hostarg, port, &s);
#else
connect_type = make_connection (NULL, (u_short) 0, &s);
#endif
#ifdef INTERNET_DOMAIN_SOCKETS
if (connect_type == (int) CONN_INTERNET)
{
char *ptr;
gethostname (thishost, HOSTNAMSZ);
if (!rflg)
{ /* attempt to generate a path
* to this machine */
if ((ptr = getenv ("GNU_NODE")) != NULL)
/* user specified a path */
strcpy (remotepath, ptr);
}
#if 0 /* This is really bogus... re-enable it if you must have it! */
#if defined (hp9000s300) || defined (hp9000s800)
else if (strcmp (thishost,hostarg))
{ /* try /net/thishost */
strcpy (remotepath, "/net/"); /* (this fails using internet
addresses) */
strcat (remotepath, thishost);
}
#endif
#endif
}
else
{ /* same machines, no need for path */
remotepath[0] = '\0'; /* default is the empty path */
}
#endif /* INTERNET_DOMAIN_SOCKETS */
#ifdef SYSV_IPC
if ((msgp = (struct msgbuf *)
malloc (sizeof *msgp + GSERV_BUFSZ)) == NULL)
{
fprintf (stderr, "%s: not enough memory for message buffer\n", progname);
exit (1);
} /* if */
msgp->mtext[0] = '\0'; /* ready for later strcats */
#endif /* SYSV_IPC */
if (suppress_windows_system)
{
char *term = getenv ("TERM");
if (!term)
{
fprintf (stderr, "%s: unknown terminal type\n", progname);
exit (1);
}
sprintf (command, "(gnuserv-edit-files '(tty %s %s %d) '(",
clean_string (tty), clean_string (term), (int)getpid ());
}
else /* !suppress_windows_system */
{
sprintf (command, "(gnuserv-edit-files '(x %s) '(",
clean_string (display));
} /* !suppress_windows_system */
send_string (s, command);
if (!argv[i])
nofiles = 1;
for (; argv[i]; i++)
{
if (i < argc - 1 && *argv[i] == '+')
starting_line = atoi (argv[i++]);
else
starting_line = 1;
/* If the last argument is +something, treat it as a file. */
if (i == argc)
{
starting_line = 1;
--i;
}
filename_expand (fullpath, argv[i]);
#ifdef INTERNET_DOMAIN_SOCKETS
path = malloc (strlen (remotepath) + strlen (fullpath) + 1);
sprintf (path, "%s%s", remotepath, fullpath);
#else
path = my_strdup (fullpath);
#endif
sprintf (command, "(%d . %s)", starting_line, clean_string (path));
send_string (s, command);
free (path);
} /* for */
sprintf (command, ")%s%s",
(quick || (nofiles && !suppress_windows_system)) ? " 'quick" : "",
view ? " 'view" : "");
send_string (s, command);
send_string (s, ")");
#ifdef SYSV_IPC
if (connect_type == (int) CONN_IPC)
disconnect_from_ipc_server (s, msgp, FALSE);
#else /* !SYSV_IPC */
if (connect_type != (int) CONN_IPC)
disconnect_from_server (s, FALSE);
#endif /* !SYSV_IPC */
} /* not batch */
if (batch && !quick)
printf ("%s\n", result);
return 0;
} /* main */
#endif /* SYSV_IPC || UNIX_DOMAIN_SOCKETS || INTERNET_DOMAIN_SOCKETS */

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/* -*-C-*-
Server code for handling requests from clients and forwarding them
on to the GNU Emacs process.
This file is part of GNU Emacs.
Copying is permitted under those conditions described by the GNU
General Public License.
Copyright (C) 1989 Free Software Foundation, Inc.
Author: Andy Norman (ange@hplb.hpl.hp.com), based on 'etc/server.c'
from the 18.52 GNU Emacs distribution.
Please mail bugs and suggestions to the author at the above address.
*/
/* HISTORY
* 11-Nov-1990 bristor@simba
* Added EOT stuff.
*/
/*
* This file incorporates new features added by Bob Weiner <weiner@mot.com>,
* Darrell Kindred <dkindred@cmu.edu> and Arup Mukherjee <arup@cmu.edu>.
* Please see the note at the end of the README file for details.
*
* (If gnuserv came bundled with your emacs, the README file is probably
* ../etc/gnuserv.README relative to the directory containing this file)
*/
#if 0
static char rcsid [] = "!Header: gnuserv.c,v 2.1 95/02/16 11:58:27 arup alpha !";
#endif
#include "gnuserv.h"
#ifdef USE_LITOUT
#ifdef linux
#include <bsd/sgtty.h>
#else
#include <sgtty.h>
#endif
#endif
#ifdef AIX
#include <sys/select.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#if !defined(SYSV_IPC) && !defined(UNIX_DOMAIN_SOCKETS) && \
!defined(INTERNET_DOMAIN_SOCKETS)
main ()
{
fprintf (stderr,"Sorry, the Emacs server is only supported on systems that have\n");
fprintf (stderr,"Unix Domain sockets, Internet Domain sockets or System V IPC\n");
exit (1);
} /* main */
#else /* SYSV_IPC || UNIX_DOMAIN_SOCKETS || INTERNET_DOMAIN_SOCKETS */
#ifdef SYSV_IPC
int ipc_qid = 0; /* ipc message queue id */
int ipc_wpid = 0; /* watchdog task pid */
/*
ipc_exit -- clean up the queue id and queue, then kill the watchdog task
if it exists. exit with the given status.
*/
void
ipc_exit (int stat)
{
msgctl (ipc_qid,IPC_RMID,0);
if (ipc_wpid != 0)
kill (ipc_wpid, SIGKILL);
exit (stat);
} /* ipc_exit */
/*
ipc_handle_signal -- catch the signal given and clean up.
*/
void
ipc_handle_signal(int sig)
{
ipc_exit (0);
} /* ipc_handle_signal */
/*
ipc_spawn_watchdog -- spawn a watchdog task to clean up the message queue should the
server process die.
*/
void
ipc_spawn_watchdog (void)
{
if ((ipc_wpid = fork ()) == 0)
{ /* child process */
int ppid = getppid (); /* parent's process id */
setpgrp(); /* gnu kills process group on exit */
while (1)
{
if (kill (ppid, 0) < 0) /* ppid is no longer valid, parent
may have died */
{
ipc_exit (0);
} /* if */
sleep(10); /* have another go later */
} /* while */
} /* if */
} /* ipc_spawn_watchdog */
/*
ipc_init -- initialize server, setting the global msqid that can be listened on.
*/
void
ipc_init (struct msgbuf **msgpp)
{
key_t key; /* messge key */
char buf[GSERV_BUFSZ]; /* pathname for key */
sprintf (buf,"/tmp/gsrv%d",(int)geteuid ());
creat (buf,0600);
key = ftok (buf,1);
if ((ipc_qid = msgget (key,0600|IPC_CREAT)) == -1)
{
perror (progname);
fprintf (stderr, "%s: unable to create msg queue\n", progname);
ipc_exit (1);
} /* if */
ipc_spawn_watchdog ();
signal (SIGTERM,ipc_handle_signal);
signal (SIGINT,ipc_handle_signal);
if ((*msgpp = (struct msgbuf *)
malloc (sizeof **msgpp + GSERV_BUFSZ)) == NULL)
{
fprintf (stderr,
"%s: unable to allocate space for message buffer\n", progname);
ipc_exit(1);
} /* if */
} /* ipc_init */
/*
handle_ipc_request -- accept a request from a client, pass the request on
to the GNU Emacs process, then wait for its reply and
pass that on to the client.
*/
void
handle_ipc_request (struct msgbuf *msgp)
{
struct msqid_ds msg_st; /* message status */
char buf[GSERV_BUFSZ];
int len; /* length of message / read */
int s, result_len; /* tag fields on the response from emacs */
int offset = 0;
int total = 1; /* # bytes that will actually be sent off */
if ((len = msgrcv (ipc_qid, msgp, GSERV_BUFSZ - 1, 1, 0)) < 0)
{
perror (progname);
fprintf (stderr, "%s: unable to receive\n", progname);
ipc_exit (1);
} /* if */
msgctl (ipc_qid, IPC_STAT, &msg_st);
strncpy (buf, msgp->mtext, len);
buf[len] = '\0'; /* terminate */
printf ("%d %s", ipc_qid, buf);
fflush (stdout);
/* now for the response from gnu */
msgp->mtext[0] = '\0';
#if 0
if ((len = read(0,buf,GSERV_BUFSZ-1)) < 0)
{
perror (progname);
fprintf (stderr, "%s: unable to read\n", progname);
ipc_exit (1);
} /* if */
sscanf (buf, "%d:%[^\n]\n", &junk, msgp->mtext);
#else
/* read in "n/m:" (n=client fd, m=message length) */
while (offset < (GSERV_BUFSZ-1) &&
((len = read (0, buf + offset, 1)) > 0) &&
buf[offset] != ':')
{
offset += len;
}
if (len < 0)
{
perror (progname);
fprintf (stderr, "%s: unable to read\n", progname);
exit(1);
}
/* parse the response from emacs, getting client fd & result length */
buf[offset] = '\0';
sscanf (buf, "%d/%d", &s, &result_len);
while (result_len > 0)
{
if ((len = read(0, buf, min2 (result_len, GSERV_BUFSZ - 1))) < 0)
{
perror (progname);
fprintf (stderr, "%s: unable to read\n", progname);
exit (1);
}
/* Send this string off, but only if we have enough space */
if (GSERV_BUFSZ > total)
{
if (total + len <= GSERV_BUFSZ)
buf[len] = 0;
else
buf[GSERV_BUFSZ - total] = 0;
send_string(s,buf);
total += strlen(buf);
}
result_len -= len;
}
/* eat the newline */
while ((len = read (0,buf,1)) == 0)
;
if (len < 0)
{
perror(progname);
fprintf (stderr,"%s: unable to read\n", progname);
exit (1);
}
if (buf[0] != '\n')
{
fprintf (stderr,"%s: garbage after result [%c]\n", progname, buf[0]);
exit (1);
}
#endif
/* Send a response back to the client. */
msgp->mtype = msg_st.msg_lspid;
if (msgsnd (ipc_qid,msgp,strlen(msgp->mtext)+1,0) < 0)
perror ("msgsend(gnuserv)");
} /* handle_ipc_request */
#endif /* SYSV_IPC */
#if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
/*
echo_request -- read request from a given socket descriptor, and send the information
to stdout (the gnu process).
*/
static void
echo_request (int s)
{
char buf[GSERV_BUFSZ];
int len;
printf("%d ",s);
/* read until we get a newline or no characters */
while ((len = recv(s,buf,GSERV_BUFSZ-1,0)) > 0) {
buf[len] = '\0';
printf("%s",buf);
if (buf[len-1] == EOT_CHR) {
fflush(stdout);
break; /* end of message */
}
} /* while */
if (len < 0) {
perror(progname);
fprintf(stderr,"%s: unable to recv\n",progname);
exit(1);
} /* if */
} /* echo_request */
/*
handle_response -- accept a response from stdin (the gnu process) and pass the
information on to the relevant client.
*/
static void
handle_response (void)
{
char buf[GSERV_BUFSZ+1];
int offset=0;
int s;
int len;
int result_len;
/* read in "n/m:" (n=client fd, m=message length) */
while (offset < GSERV_BUFSZ &&
((len = read(0,buf+offset,1)) > 0) &&
buf[offset] != ':') {
offset += len;
}
if (len < 0) {
perror(progname);
fprintf(stderr,"%s: unable to read\n",progname);
exit(1);
}
/* parse the response from emacs, getting client fd & result length */
buf[offset] = '\0';
sscanf(buf,"%d/%d", &s, &result_len);
while (result_len > 0) {
if ((len = read(0,buf,min2(result_len,GSERV_BUFSZ))) < 0) {
perror(progname);
fprintf(stderr,"%s: unable to read\n",progname);
exit(1);
}
buf[len] = '\0';
send_string(s,buf);
result_len -= len;
}
/* eat the newline */
while ((len = read(0,buf,1)) == 0)
;
if (len < 0)
{
perror(progname);
fprintf(stderr,"%s: unable to read\n",progname);
exit(1);
}
if (buf[0] != '\n')
{
fprintf(stderr,"%s: garbage after result\n",progname);
exit(1);
}
/* send the newline */
buf[1] = '\0';
send_string(s,buf);
close(s);
} /* handle_response */
#endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
#ifdef INTERNET_DOMAIN_SOCKETS
struct entry {
u_long host_addr;
struct entry *next;
};
struct entry *permitted_hosts[TABLE_SIZE];
#ifdef AUTH_MAGIC_COOKIE
# include <X11/X.h>
# include <X11/Xauth.h>
static Xauth *server_xauth = NULL;
#endif
static int
timed_read (int fd, char *buf, int max, int timeout, int one_line)
{
fd_set rmask;
struct timeval tv; /* = {timeout, 0}; */
char c = 0;
int nbytes = 0;
int r;
tv.tv_sec = timeout;
tv.tv_usec = 0;
FD_ZERO(&rmask);
FD_SET(fd, &rmask);
do
{
r = select(fd + 1, &rmask, NULL, NULL, &tv);
if (r > 0)
{
if (read (fd, &c, 1) == 1 )
{
*buf++ = c;
++nbytes;
}
else
{
printf ("read error on socket\004\n");
return -1;
}
}
else if (r == 0)
{
printf ("read timed out\004\n");
return -1;
}
else
{
printf ("error in select\004\n");
return -1;
}
} while ((nbytes < max) && !(one_line && (c == '\n')));
--buf;
if (one_line && *buf == '\n')
{
*buf = 0;
}
return nbytes;
}
/*
permitted -- return whether a given host is allowed to connect to the server.
*/
static int
permitted (u_long host_addr, int fd)
{
int key;
struct entry *entry;
char auth_protocol[128];
char buf[1024];
int auth_data_len;
if (fd > 0)
{
/* we are checking permission on a real connection */
/* Read auth protocol name */
if (timed_read(fd, auth_protocol, AUTH_NAMESZ, AUTH_TIMEOUT, 1) <= 0)
return FALSE;
if (strcmp (auth_protocol, DEFAUTH_NAME) &&
strcmp (auth_protocol, MCOOKIE_NAME))
{
printf ("authentication protocol (%s) from client is invalid...\n",
auth_protocol);
printf ("... Was the client an old version of gnuclient/gnudoit?\004\n");
return FALSE;
}
if (!strcmp(auth_protocol, MCOOKIE_NAME))
{
/*
* doing magic cookie auth
*/
if (timed_read(fd, buf, 10, AUTH_TIMEOUT, 1) <= 0)
return FALSE;
auth_data_len = atoi(buf);
if (timed_read(fd, buf, auth_data_len, AUTH_TIMEOUT, 0) != auth_data_len)
return FALSE;
#ifdef AUTH_MAGIC_COOKIE
if (server_xauth && server_xauth->data &&
!memcmp(buf, server_xauth->data, auth_data_len))
{
return TRUE;
}
#else
printf ("client tried Xauth, but server is not compiled with Xauth\n");
#endif
/*
* auth failed, but allow this to fall through to the GNU_SECURE
* protocol....
*/
printf ("Xauth authentication failed, trying GNU_SECURE auth...\004\n");
}
/* Other auth protocols go here, and should execute only if the
* auth_protocol name matches.
*/
}
/* Now, try the old GNU_SECURE stuff... */
/* First find the hash key */
key = HASH(host_addr) % TABLE_SIZE;
/* Now check the chain for that hash key */
for(entry=permitted_hosts[key]; entry != NULL; entry=entry->next)
if (host_addr == entry->host_addr)
return(TRUE);
return(FALSE);
} /* permitted */
/*
add_host -- add the given host to the list of permitted hosts, provided it isn't
already there.
*/
static void
add_host (u_long host_addr)
{
int key;
struct entry *new_entry;
if (!permitted(host_addr, -1))
{
if ((new_entry = (struct entry *) malloc(sizeof(struct entry))) == NULL) {
fprintf(stderr,"%s: unable to malloc space for permitted host entry\n",
progname);
exit(1);
} /* if */
new_entry->host_addr = host_addr;
key = HASH(host_addr) % TABLE_SIZE;
new_entry->next = permitted_hosts[key];
permitted_hosts[key] = new_entry;
} /* if */
} /* add_host */
/*
setup_table -- initialise the table of hosts allowed to contact the server,
by reading from the file specified by the GNU_SECURE
environment variable
Put in the local machine, and, if a security file is specifed,
add each host that is named in the file.
Return the number of hosts added.
*/
static int
setup_table (void)
{
FILE *host_file;
char *file_name;
char hostname[HOSTNAMSZ];
u_int host_addr;
int i, hosts=0;
/* Make sure every entry is null */
for (i=0; i<TABLE_SIZE; i++)
permitted_hosts[i] = NULL;
gethostname(hostname,HOSTNAMSZ);
if ((host_addr = internet_addr(hostname)) == -1)
{
fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP",
progname,hostname);
exit(1);
} /* if */
#ifdef AUTH_MAGIC_COOKIE
server_xauth = XauGetAuthByAddr (FamilyInternet,
sizeof(host_addr), (char *)&host_addr,
strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
hosts++;
#endif /* AUTH_MAGIC_COOKIE */
#if 0 /* Don't even want to allow access from the local host by default */
add_host(host_addr); /* add local host */
#endif
if (((file_name = getenv("GNU_SECURE")) != NULL && /* security file */
(host_file = fopen(file_name,"r")) != NULL)) /* opened ok */
{
while ((fscanf(host_file,"%s",hostname) != EOF)) /* find a host */
if ((host_addr = internet_addr(hostname)) != -1)/* get its addr */
{
add_host(host_addr); /* add the addr */
hosts++;
}
fclose(host_file);
} /* if */
return hosts;
} /* setup_table */
/*
internet_init -- initialize server, returning an internet socket that can
be listened on.
*/
static int
internet_init (void)
{
int ls; /* socket descriptor */
struct servent *sp; /* pointer to service information */
struct sockaddr_in server; /* for local socket address */
char *ptr; /* ptr to return from getenv */
if (setup_table() == 0)
return -1;
/* clear out address structure */
memset((char *)&server,0,sizeof(struct sockaddr_in));
/* Set up address structure for the listen socket. */
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
/* Find the information for the gnu server
* in order to get the needed port number.
*/
if ((ptr=getenv("GNU_PORT")) != NULL)
server.sin_port = htons(atoi(ptr));
else if ((sp = getservbyname ("gnuserv", "tcp")) == NULL)
server.sin_port = htons(DEFAULT_PORT+getuid());
else
server.sin_port = sp->s_port;
/* Create the listen socket. */
if ((ls = socket (AF_INET,SOCK_STREAM, 0)) == -1)
{
perror(progname);
fprintf(stderr,"%s: unable to create socket\n",progname);
exit(1);
} /* if */
/* Bind the listen address to the socket. */
if (bind(ls,(struct sockaddr *) &server,sizeof(struct sockaddr_in)) == -1)
{
perror(progname);
fprintf(stderr,"%s: unable to bind socket\n",progname);
exit(1);
} /* if */
/* Initiate the listen on the socket so remote users
* can connect.
*/
if (listen(ls,20) == -1)
{
perror(progname);
fprintf(stderr,"%s: unable to listen\n",progname);
exit(1);
} /* if */
return(ls);
} /* internet_init */
/*
handle_internet_request -- accept a request from a client and send the information
to stdout (the gnu process).
*/
static void
handle_internet_request (int ls)
{
int s;
size_t addrlen = sizeof(struct sockaddr_in);
struct sockaddr_in peer; /* for peer socket address */
memset((char *)&peer,0,sizeof(struct sockaddr_in));
if ((s = accept(ls,(struct sockaddr *)&peer, (void *) &addrlen)) == -1)
{
perror(progname);
fprintf(stderr,"%s: unable to accept\n",progname);
exit(1);
} /* if */
/* Check that access is allowed - if not return crud to the client */
if (!permitted(peer.sin_addr.s_addr, s))
{
send_string(s,"gnudoit: Connection refused\ngnudoit: unable to connect to remote");
close(s);
printf("Refused connection from %s\004\n", inet_ntoa(peer.sin_addr));
return;
} /* if */
echo_request(s);
} /* handle_internet_request */
#endif /* INTERNET_DOMAIN_SOCKETS */
#ifdef UNIX_DOMAIN_SOCKETS
/*
unix_init -- initialize server, returning an unix-domain socket that can
be listened on.
*/
static int
unix_init (void)
{
int ls; /* socket descriptor */
struct sockaddr_un server; /* unix socket address */
int bindlen;
if ((ls = socket(AF_UNIX,SOCK_STREAM, 0)) < 0)
{
perror(progname);
fprintf(stderr,"%s: unable to create socket\n",progname);
exit(1);
} /* if */
/* Set up address structure for the listen socket. */
#ifdef HIDE_UNIX_SOCKET
sprintf(server.sun_path,"/tmp/gsrvdir%d",(int)geteuid());
if (mkdir(server.sun_path, 0700) < 0)
{
/* assume it already exists, and try to set perms */
if (chmod(server.sun_path, 0700) < 0)
{
perror(progname);
fprintf(stderr,"%s: can't set permissions on %s\n",
progname, server.sun_path);
exit(1);
}
}
strcat(server.sun_path,"/gsrv");
unlink(server.sun_path); /* remove old file if it exists */
#else /* HIDE_UNIX_SOCKET */
sprintf(server.sun_path,"/tmp/gsrv%d",(int)geteuid());
unlink(server.sun_path); /* remove old file if it exists */
#endif /* HIDE_UNIX_SOCKET */
server.sun_family = AF_UNIX;
#ifdef HAVE_SOCKADDR_SUN_LEN
/* See W. R. Stevens "Advanced Programming in the Unix Environment"
p. 502 */
bindlen = (sizeof (server.sun_len) + sizeof (server.sun_family)
+ strlen (server.sun_path) + 1);
server.sun_len = bindlen;
#else
bindlen = strlen (server.sun_path) + sizeof (server.sun_family);
#endif
if (bind(ls,(struct sockaddr *)&server,bindlen) < 0)
{
perror(progname);
fprintf(stderr,"%s: unable to bind socket\n",progname);
exit(1);
} /* if */
chmod(server.sun_path,0700); /* only this user can send commands */
if (listen(ls,20) < 0) {
perror(progname);
fprintf(stderr,"%s: unable to listen\n",progname);
exit(1);
} /* if */
/* #### there are also better ways of dealing with this when
sigvec() is present. */
#if defined (HAVE_SIGPROCMASK)
{
sigset_t _mask;
sigemptyset (&_mask);
sigaddset (&_mask, SIGPIPE);
sigprocmask (SIG_BLOCK, &_mask, NULL);
}
#else
signal(SIGPIPE,SIG_IGN); /* in case user kills client */
#endif
return(ls);
} /* unix_init */
/*
handle_unix_request -- accept a request from a client and send the information
to stdout (the gnu process).
*/
static void
handle_unix_request (int ls)
{
int s;
size_t len = sizeof(struct sockaddr_un);
struct sockaddr_un server; /* for unix socket address */
server.sun_family = AF_UNIX;
if ((s = accept(ls,(struct sockaddr *)&server, (void *)&len)) < 0)
{
perror(progname);
fprintf(stderr,"%s: unable to accept\n",progname);
} /* if */
echo_request(s);
} /* handle_unix_request */
#endif /* UNIX_DOMAIN_SOCKETS */
int
main(argc,argv)
int argc;
char *argv[];
{
int chan; /* temporary channel number */
#ifdef INTERNET_DOMAIN_SOCKETS
int ils = -1; /* internet domain listen socket */
#endif
#ifdef UNIX_DOMAIN_SOCKETS
int uls = -1; /* unix domain listen socket */
#endif
#ifdef SYSV_IPC
struct msgbuf *msgp; /* message buffer */
#endif /* SYSV_IPC */
progname = argv[0];
for(chan=3; chan < _NFILE; close(chan++)) /* close unwanted channels */
;
#ifdef USE_LITOUT
{
/* this is to allow ^D to pass to emacs */
int d = LLITOUT;
(void) ioctl(fileno(stdout), TIOCLBIS, &d);
}
#endif
#ifdef SYSV_IPC
ipc_init(&msgp); /* get a msqid to listen on, and a message buffer */
#endif /* SYSV_IPC */
#ifdef INTERNET_DOMAIN_SOCKETS
ils = internet_init(); /* get a internet domain socket to listen on */
#endif /* INTERNET_DOMAIN_SOCKETS */
#ifdef UNIX_DOMAIN_SOCKETS
uls = unix_init(); /* get a unix domain socket to listen on */
#endif /* UNIX_DOMAIN_SOCKETS */
while (1) {
#ifdef SYSV_IPC
handle_ipc_request(msgp);
#else /* NOT SYSV_IPC */
fd_set rmask;
FD_ZERO(&rmask);
FD_SET(fileno(stdin), &rmask);
if (uls >= 0)
FD_SET(uls, &rmask);
if (ils >= 0)
FD_SET(ils, &rmask);
if (select(max2(fileno(stdin),max2(uls,ils)) + 1, &rmask,
(fd_set *)NULL, (fd_set *)NULL, (struct timeval *)NULL) < 0)
{
perror(progname);
fprintf(stderr,"%s: unable to select\n",progname);
exit(1);
} /* if */
#ifdef UNIX_DOMAIN_SOCKETS
if (uls > 0 && FD_ISSET(uls, &rmask))
handle_unix_request(uls);
#endif
#ifdef INTERNET_DOMAIN_SOCKETS
if (ils > 0 && FD_ISSET(ils, &rmask))
handle_internet_request(ils);
#endif /* INTERNET_DOMAIN_SOCKETS */
if (FD_ISSET(fileno(stdin), &rmask)) /* from stdin (gnu process) */
handle_response();
#endif /* NOT SYSV_IPC */
} /* while */
return 0;
} /* main */
#endif /* SYSV_IPC || UNIX_DOMAIN_SOCKETS || INTERNET_DOMAIN_SOCKETS */

220
src/daemon/gnuserv.h Normal file
View File

@@ -0,0 +1,220 @@
/* -*-C-*-
Header file for the GNU Emacs server and client C code.
This file is part of GNU Emacs.
Copying is permitted under those conditions described by the GNU
General Public License.
Copyright (C) 1989 Free Software Foundation, Inc.
Author: Andy Norman (ange@hplb.hpl.hp.com), based on
'etc/server.c' and 'etc/emacsclient.c' from the 18.52 GNU
Emacs distribution.
Please mail bugs and suggestions to the author at the above address.
*/
/* HISTORY
* 11-Nov-1990 bristor@simba
* Added EOT stuff.
*/
/*
* This file incorporates new features added by Bob Weiner <weiner@mot.com>,
* Darrell Kindred <dkindred@cmu.edu> and Arup Mukherjee <arup@cmu.edu>.
* Please see the note at the end of the README file for details.
*
* (If gnuserv came bundled with your emacs, the README file is probably
* ../etc/gnuserv.README relative to the directory containing this file)
*/
#if 0
static char header_rcsid [] = "!Header: gnuserv.h,v 2.4 95/02/16 11:58:11 arup alpha !";
#endif
#define NO_SHORTNAMES
#define PATCHLEVEL 2
#define NO_SHORTNAMES
/* gnuserv should not be compiled using SOCKS */
#define DO_NOT_SOCKSIFY
#include <../src/config.h>
#undef read
#undef write
#undef open
#undef close
#undef signal
/* Define the communication method between server and clients:
* You can have either or both kinds of sockets, but you can't mix
* sockets with sysv ipc
*/
#define INTERNET_DOMAIN_SOCKETS
#define UNIX_DOMAIN_SOCKETS
/* #define SYSV_IPC */
/*
* Define additional authentication protocols to be used. These methods will
* be tried before falling back to the default gnuserv protocol (based on
* the GNU_SECURE environment variable). Currently, only MIT-MAGIC-COOKIE-1
* is also supported.
*
* Comment out the next line(s) if you don't want to enable the
* appropriate authentication protocol.
*/
#if defined (HAVE_XAUTH)
#define AUTH_MAGIC_COOKIE
#endif /* HAVE_XAUTH */
/*
* stuff related to supporting MIT-MAGIC-COOKIE-1
*/
#define MCOOKIE_SCREEN "999" /* screen # to use as the gnuserv cookie */
#define MCOOKIE_NAME "MAGIC-1" /* authentication protocol name */
#define MCOOKIE_X_NAME "MIT-MAGIC-COOKIE-1" /* as needed by X */
#define DEFAUTH_NAME "GNU-SECURE" /* name of default auth protocol */
#define AUTH_TIMEOUT 15 /* # seconds to wait for auth data */
#define AUTH_NAMESZ 15 /* max allows auth protocol name size */
/*
* Pick a default communication scheme, if none was specified.
*/
#if !defined(SYSV_IPC) && !defined(UNIX_DOMAIN_SOCKETS) && !defined(INTERNET_DOMAIN_SOCKETS)
#ifdef HAVE_SYSVIPC
#define SYSV_IPC /* SYSV systems use SYSV IPC by default */
#endif /* HAVE_SYSVIPC */
#ifdef BSD
#define UNIX_DOMAIN_SOCKETS /* BSD systems use Unix Domain sockets by default */
#endif /* BSD */
#endif /* No communication method pre-defined */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
/*
* If you are using SYSV_IPC, you might want to make the buffer size bigger
* since it limits the size of requests and responses. Don't make it bigger
* than your system's max message size though (usually a couple of k) or else
* msgsend will start failing. For sockets, using the system BUFSIZ is usually
* what you want.
*/
# define GSERV_BUFSZ BUFSIZ
#ifdef SYSV_IPC
#include <sys/ipc.h>
#include <sys/msg.h>
#define send_string(s,str) \
if (strlen(msgp->mtext) + strlen(str) < GSERV_BUFSZ) \
strcat(msgp->mtext,str); \
else \
{ \
fprintf(stderr,"%s: not enough message buffer space\n",progname); \
exit(1); \
} \
#endif /* SYSV_IPC */
#if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
#include <sys/socket.h>
#endif /* INTERNET_DOMAIN_SOCKETS || UNIX_DOMAIN_SOCKETS */
#ifdef INTERNET_DOMAIN_SOCKETS
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define TABLE_SIZE 101 /* The number of entries in the hash table */
#define HASH(host) host /* Rather simplistic hash function */
#define DEFAULT_PORT 21490 /* default port number to use is
* DEFAULT_PORT + uid */
#endif /* INTERNET_DOMAIN_SOCKETS */
#ifdef UNIX_DOMAIN_SOCKETS
#include <sys/un.h>
#define HIDE_UNIX_SOCKET /* put the unix socket in a protected dir */
#endif /* UNIX_DOMAIN_SOCKETS */
/* On some platforms, we need to do the equivalent of "stty litout" to get
* characters like ^D to pass through to emacs. This problem has only
* been observed under emacs18; fsf19 and lemacs are probably okay without it.
*/
#ifndef DONT_USE_LITOUT
#if !defined(HAVE_TERMIO) && !defined(HAVE_TERMIOS) && !defined(VMS)
#if !defined(MSDOS) && !defined(BSD4_1)
#define USE_LITOUT
#endif
#endif
#endif
#define HOSTNAMSZ 255 /* max size of a hostname */
#define REPLYSIZ 300 /* max size of reply from server to client */
#undef FALSE
#define FALSE 0
#undef TRUE
#define TRUE 1
extern char *optarg;
extern int optind;
extern char *progname;
/* The casts shut Sun's compiler up and are safe in the context these
are actually used. */
#define max2(x,y) (((int) (x) > (int) (y)) ? (x) : (y))
#define min2(x,y) (((int) (x) < (int) (y)) ? (x) : (y))
#ifndef _NFILE /* rough guess at maximum number of open files */
#define _NFILE 20
#endif
#define EOT_STR "\004"
#define EOT_CHR '\004'
/* connection types */
#define CONN_UNIX 0
#define CONN_INTERNET 1
#define CONN_IPC 2
/* function declarations */
int make_connection (char *hostarg, int portarg, int *s);
#ifdef SYSV_IPC
void disconnect_from_ipc_server();
#endif
#if defined(INTERNET_DOMAIN_SOCKETS) || defined(UNIX_DOMAIN_SOCKETS)
void send_string (int s, CONST char *msg);
void disconnect_from_server (int s, int echo);
int read_line (int s, char *dest);
#endif
#ifdef INTERNET_DOMAIN_SOCKETS
int internet_addr (char *host);
#endif