/* Client process that communicates with GNU Emacs acting as server.
- Copyright (C) 1986, 1987, 1994, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1986, 1987, 1994, 1999, 2000 Free Software Foundation, Inc.
This file is part of GNU Emacs.
#include <unistd.h>
#endif
+#ifdef VMS
+# include "vms-pwd.h"
+#else
+# include <pwd.h>
+#endif /* not VMS */
+
char *getenv (), *getwd ();
char *getcwd ();
{ "no-wait", no_argument, NULL, 'n' },
{ "help", no_argument, NULL, 'H' },
{ "version", no_argument, NULL, 'V' },
+ { "alternate-editor",required_argument, NULL, 'a' },
{ 0 }
};
+
+const char * alternate_editor = NULL;
+
/* Decode the options from argv and argc.
The global variable `optind' will say how many arguments we used up. */
while (1)
{
int opt = getopt_long (argc, argv,
- "VHn", longopts, 0);
+ "VHna:", longopts, 0);
if (opt == EOF)
break;
+ alternate_editor = getenv ("ALTERNATE_EDITOR");
+
switch (opt)
{
case 0:
/* If getopt returns 0, then it has already processed a
long-named option. We should do nothing. */
break;
-
+
+ case 'a':
+ alternate_editor = optarg;
+ break;
+
case 'n':
nowait = 1;
break;
print_help_and_exit ()
{
fprintf (stderr,
- "Usage: %s [-n] [--no-wait] [+LINENUMBER] FILENAME\n",
+ "Usage: %s [-a ALTERNATE-EDITOR] [-n] [--no-wait] [+LINENUMBER] FILENAME\n",
progname);
fprintf (stderr,
"Or %s --version\n",
}
*q++ = 0;
+
return copy;
}
}
return result;
}
+\f
+/*
+ Try to run a different command, or --if no alternate editor is
+ defined-- exit with an errorcode.
+*/
+fail (argc, argv)
+ int argc;
+ char **argv;
+{
+ if (alternate_editor)
+ {
+ int i = optind -1 ;
+ execvp (alternate_editor, argv + i);
+ }
+ else
+ {
+ exit (1);
+ }
+}
+
+
+
\f
#if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
argv[0]);
fprintf (stderr, "on systems with Berkeley sockets or System V IPC.\n");
- exit (1);
+
+ fail (argc, argv);
}
#else /* HAVE_SOCKETS or HAVE_SYSVIPC */
extern char *strerror ();
extern int errno;
+/* Three possibilities:
+ 2 - can't be `stat'ed (sets errno)
+ 1 - isn't owned by us
+ 0 - success: none of the above */
+
+static int
+socket_status (socket_name)
+ char *socket_name;
+{
+ struct stat statbfr;
+
+ if (stat (socket_name, &statbfr) == -1)
+ return 2;
+
+ if (statbfr.st_uid != geteuid ())
+ return 1;
+
+ return 0;
+}
+
int
main (argc, argv)
int argc;
int s, i;
FILE *out, *in;
struct sockaddr_un server;
- char *homedir, *cwd, *str;
+#ifdef SERVER_HOME_DIR
+ char *homedir;
+#endif
+ char *cwd, *str;
char string[BUFSIZ];
progname = argv[0];
{
fprintf (stderr, "%s: ", argv[0]);
perror ("socket");
- exit (1);
+ fail (argc, argv);
}
+
server.sun_family = AF_UNIX;
{
#ifndef SERVER_HOME_DIR
{
- struct stat statbfr;
+ int sock_status = 0;
sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
- if (stat (server.sun_path, &statbfr) == -1)
+ /* See if the socket exists, and if it's owned by us. */
+ sock_status = socket_status (server.sun_path);
+ if (sock_status)
{
- if (errno == ENOENT)
- fprintf (stderr,
- "%s: can't find socket; have you started the server?\n",
- argv[0]);
- else
- fprintf (stderr, "%s: can't stat %s: %s\n",
- argv[0], server.sun_path, strerror (errno));
- exit (1);
- }
- if (statbfr.st_uid != geteuid ())
- {
- fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
- exit (1);
+ /* Failing that, see if LOGNAME or USER exist and differ from
+ our euid. If so, look for a socket based on the UID
+ associated with the name. This is reminiscent of the logic
+ that init_editfns uses to set the global Vuser_full_name. */
+
+ char *user_name = (char *) getenv ("LOGNAME");
+ if (!user_name)
+ user_name = (char *) getenv ("USER");
+
+ if (user_name)
+ {
+ struct passwd *pw = getpwnam (user_name);
+ if (pw && (pw->pw_uid != geteuid ()))
+ {
+ /* We're running under su, apparently. */
+ sprintf (server.sun_path, "/tmp/esrv%d-%s",
+ pw->pw_uid, system_name);
+ sock_status = socket_status (server.sun_path);
+ }
+ }
}
+
+ switch (sock_status)
+ {
+ case 1:
+ /* There's a socket, but it isn't owned by us. This is OK if
+ we are root. */
+ if (0 != geteuid ())
+ {
+ fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
+ fail (argc, argv);
+ }
+ break;
+
+ case 2:
+ /* `stat' failed */
+ if (errno == ENOENT)
+ fprintf (stderr,
+ "%s: can't find socket; have you started the server?\n",
+ argv[0]);
+ else
+ fprintf (stderr, "%s: can't stat %s: %s\n",
+ argv[0], server.sun_path, strerror (errno));
+ fail (argc, argv);
+ break;
+ }
}
#else
if ((homedir = getenv ("HOME")) == NULL)
{
fprintf (stderr, "%s: No home directory\n", argv[0]);
- exit (1);
+ fail (argc, argv);
}
strcpy (server.sun_path, homedir);
strcat (server.sun_path, "/.emacs-server-");
{
fprintf (stderr, "%s: ", argv[0]);
perror ("connect");
- exit (1);
+ fail (argc, argv);
}
/* We use the stream OUT to send our command to the server. */
{
fprintf (stderr, "%s: ", argv[0]);
perror ("fdopen");
- exit (1);
+ fail (argc, argv);
}
/* We use the stream IN to read the response.
{
fprintf (stderr, "%s: ", argv[0]);
perror ("fdopen");
- exit (1);
+ fail (argc, argv);
}
#ifdef BSD_SYSTEM
"Cannot get current working directory",
#endif
strerror (errno));
- exit (1);
+ fail (argc, argv);
}
if (nowait)
fprintf (stderr, "%s: Cannot get current working directory: %s\n",
argv[0], strerror (errno));
#endif
- exit (1);
+ fail (argc, argv);
}
msgp->mtext[0] = 0;
if (strlen (msgp->mtext) >= 512)
{
fprintf (stderr, "%s: args too long for msgsnd\n", progname);
- exit (1);
+ fail (argc, argv);
}
#endif
msgp->mtype = 1;
{
fprintf (stderr, "%s: ", progname);
perror ("msgsnd");
- exit (1);
+ fail (argc, argv);
}
/* Maybe wait for an answer. */