remote.c revision 8108eb18 
1/* $Xorg: remote.c,v 1.5 2001/02/09 02:06:01 xorgcvs Exp $ */
2/******************************************************************************
3
4Copyright 1993, 1998  The Open Group
5
6Permission to use, copy, modify, distribute, and sell this software and its
7documentation for any purpose is hereby granted without fee, provided that
8the above copyright notice appear in all copies and that both that
9copyright notice and this permission notice appear in supporting
10documentation.
11
12The above copyright notice and this permission notice shall be included in
13all copies or substantial portions of the Software.
14
15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
18OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
19AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22Except as contained in this notice, the name of The Open Group shall not be
23used in advertising or otherwise to promote the sale, use or other dealings
24in this Software without prior written authorization from The Open Group.
25******************************************************************************/
26/* $XFree86: xc/programs/xsm/remote.c,v 1.4 2001/01/17 23:46:30 dawes Exp $ */
27
28/*
29 * We use the rstart protocol to restart clients on remote machines.
30 */
31
32#include "xsm.h"
33#include "log.h"
34
35#include <X11/ICE/ICEutil.h>
36
37static char 		*format_rstart_env(char *str);
38
39extern IceAuthDataEntry	*authDataEntries;
40extern int		numTransports;
41
42
43void
44remote_start(char *restart_protocol, char *restart_machine, char *program,
45	     char **args, char *cwd, char **env,
46	     char *non_local_display_env, char *non_local_session_env)
47{
48    FILE *fp;
49    int	 pipefd[2];
50    char msg[256];
51    int  i;
52
53    if (strcmp (restart_protocol, "rstart-rsh") != 0)
54    {
55	if (verbose)
56	    printf ("Only rstart-rsh remote execution protocol supported.\n");
57	return;
58    }
59
60    if (!restart_machine)
61    {
62	if (verbose)
63	    printf ("Bad remote machine specified for remote execute.\n");
64	return;
65    }
66
67    if (verbose)
68	printf ("Attempting to restart remote client on %s\n",
69	    restart_machine);
70
71    if (pipe (pipefd) < 0)
72    {
73	sprintf (msg, "%s: pipe() error during remote start of %s",
74	    Argv[0], program);
75	add_log_text (msg);
76	perror (msg);
77    }
78    else
79    {
80	switch(fork())
81	{
82	case -1:
83
84	    sprintf (msg, "%s: fork() error during remote start of %s",
85		Argv[0], program);
86	    add_log_text (msg);
87	    perror (msg);
88	    break;
89
90	case 0:		/* kid */
91
92	    close (pipefd[1]);
93	    close (0);
94	    dup (pipefd[0]);
95	    close (pipefd[0]);
96
97	    execlp (RSHCMD, restart_machine, "rstartd", (char *) 0);
98
99	    sprintf (msg,
100	        "%s: execlp() of rstartd failed for remote start of %s",
101		Argv[0], program);
102	    perror (msg);
103	    /*
104	     * TODO : We would like to send this log information to the
105	     * log window in the parent.  This would require using the
106	     * pipe between the parent and child.  The child would
107	     * set close-on-exec.  If the exec succeeds, the pipe will
108	     * be closed.  If it fails, the child can write a message
109	     * to the parent.
110	     */
111	    _exit(255);
112
113	default:		/* parent */
114
115	    close (pipefd[0]);
116	    fp = (FILE *) fdopen (pipefd[1], "w");
117
118	    fprintf (fp, "CONTEXT X\n");
119	    fprintf (fp, "DIR %s\n", cwd);
120	    fprintf (fp, "DETACH\n");
121
122	    if (env)
123	    {
124		/*
125		 * The application saved its environment.
126		 */
127
128		for (i = 0; env[i]; i++)
129		{
130		    /*
131		     * rstart requires that any spaces, backslashes, or
132		     * non-printable characters inside of a string be
133		     * represented by octal escape sequences.
134		     */
135
136		    char *temp = format_rstart_env (env[i]);
137		    fprintf (fp, "MISC X %s\n", temp);
138		    if (temp != env[i])
139			XtFree (temp);
140		}
141	    }
142	    else
143	    {
144		/*
145		 * The application did not save its environment.
146		 * The default PATH set up by rstart may not contain
147		 * the program we want to restart.  We play it safe
148		 * and pass xsm's PATH.  This will most likely contain
149		 * the path we need.
150		 */
151
152		char *path = (char *) getenv ("PATH");
153
154		if (path)
155		    fprintf (fp, "MISC X PATH=%s\n", path);
156	    }
157
158	    fprintf (fp, "MISC X %s\n", non_local_display_env);
159	    fprintf (fp, "MISC X %s\n", non_local_session_env);
160
161	    /*
162	     * Pass the authentication data.
163	     * Each transport has auth data for ICE and XSMP.
164	     * Don't pass local auth data.
165	     */
166
167	    for (i = 0; i < numTransports * 2; i++)
168	    {
169		if (Strstr (authDataEntries[i].network_id, "local/"))
170		    continue;
171
172		fprintf (fp, "AUTH ICE %s \"\" %s %s ",
173		    authDataEntries[i].protocol_name,
174		    authDataEntries[i].network_id,
175		    authDataEntries[i].auth_name);
176
177		fprintfhex (fp,
178		    authDataEntries[i].auth_data_length,
179		    authDataEntries[i].auth_data);
180
181		fprintf (fp, "\n");
182	    }
183
184	    /*
185	     * And execute the program
186	     */
187
188	    fprintf (fp, "EXEC %s %s", program, program);
189	    for (i = 1; args[i]; i++)
190		fprintf (fp, " %s", args[i]);
191	    fprintf (fp, "\n\n");
192	    fclose (fp);
193	    break;
194	}
195    }
196}
197
198
199
200/*
201 * rstart requires that any spaces/backslashes/non-printable characters
202 * inside of a string be represented by octal escape sequences.
203 */
204
205static char *
206format_rstart_env(char *str)
207{
208    int escape_count = 0, i;
209    char *temp = str;
210
211    while (*temp != '\0')
212    {
213	if (!isgraph (*temp) || *temp == '\\')
214	    escape_count++;
215	temp++;
216    }
217
218    if (escape_count == 0)
219	return (str);
220    else
221    {
222	int len = strlen (str) + 1 + (escape_count * 3);
223	char *ret = (char *) XtMalloc (len);
224	char *ptr = ret;
225
226	temp = str;
227	while (*temp != '\0')
228	{
229	    if (!isgraph (*temp) || *temp == '\\')
230	    {
231		char octal[3];
232		sprintf (octal, "%o", *temp);
233		*(ptr++) = '\\';
234		for (i = 0; i < (3 - (int) strlen (octal)); i++)
235		    *(ptr++) = '0';
236		strcpy (ptr, octal);
237		ptr += strlen (octal);
238	    }
239	    else
240		*(ptr++) = *temp;
241
242	    temp++;
243	}
244
245	*ptr = '\0';
246	return (ret);
247    }
248}
249