1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate * CDDL HEADER START
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance
7*0Sstevel@tonic-gate * with the License.
8*0Sstevel@tonic-gate *
9*0Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate * and limitations under the License.
13*0Sstevel@tonic-gate *
14*0Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate *
20*0Sstevel@tonic-gate * CDDL HEADER END
21*0Sstevel@tonic-gate *
22*0Sstevel@tonic-gate * Copyright 1985 Sun Microsystems, Inc. All rights reserved.
23*0Sstevel@tonic-gate * Use is subject to license terms.
24*0Sstevel@tonic-gate */
25*0Sstevel@tonic-gate
26*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI"
27*0Sstevel@tonic-gate
28*0Sstevel@tonic-gate
29*0Sstevel@tonic-gate /*
30*0Sstevel@tonic-gate * under.c - program to execute a command under a given directory
31*0Sstevel@tonic-gate *
32*0Sstevel@tonic-gate */
33*0Sstevel@tonic-gate
34*0Sstevel@tonic-gate #include <errno.h>
35*0Sstevel@tonic-gate #include <signal.h>
36*0Sstevel@tonic-gate #include <stdio.h>
37*0Sstevel@tonic-gate #include <stdlib.h>
38*0Sstevel@tonic-gate #include <string.h>
39*0Sstevel@tonic-gate
40*0Sstevel@tonic-gate #include <rpc/rpc.h>
41*0Sstevel@tonic-gate #include <nfs/nfs.h>
42*0Sstevel@tonic-gate #include <rpcsvc/mount.h>
43*0Sstevel@tonic-gate #include <sys/time.h>
44*0Sstevel@tonic-gate
45*0Sstevel@tonic-gate static char **Argv; /* saved argument vector (for ps) */
46*0Sstevel@tonic-gate static char *LastArgv; /* saved end-of-argument vector */
47*0Sstevel@tonic-gate
48*0Sstevel@tonic-gate int Debug = 0;
49*0Sstevel@tonic-gate
50*0Sstevel@tonic-gate int child = 0; /* pid of the executed process */
51*0Sstevel@tonic-gate int ChildDied = 0; /* true when above is valid */
52*0Sstevel@tonic-gate int HasHelper = 0; /* must kill helpers (interactive mode) */
53*0Sstevel@tonic-gate time_t time_now;
54*0Sstevel@tonic-gate /*
55*0Sstevel@tonic-gate * SETPROCTITLE -- set the title of this process for "ps"
56*0Sstevel@tonic-gate *
57*0Sstevel@tonic-gate * Does nothing if there were not enough arguments on the command
58*0Sstevel@tonic-gate * line for the information.
59*0Sstevel@tonic-gate *
60*0Sstevel@tonic-gate * Side Effects:
61*0Sstevel@tonic-gate * Clobbers argv[] of our main procedure.
62*0Sstevel@tonic-gate */
63*0Sstevel@tonic-gate void
setproctitle(user,host)64*0Sstevel@tonic-gate setproctitle(user, host)
65*0Sstevel@tonic-gate char *user, *host;
66*0Sstevel@tonic-gate {
67*0Sstevel@tonic-gate register char *tohere;
68*0Sstevel@tonic-gate
69*0Sstevel@tonic-gate tohere = Argv[0];
70*0Sstevel@tonic-gate if ((int)(LastArgv == (char *)NULL) ||
71*0Sstevel@tonic-gate (int)(strlen(user)+strlen(host)+3) > (int)(LastArgv - tohere))
72*0Sstevel@tonic-gate return;
73*0Sstevel@tonic-gate *tohere++ = '-'; /* So ps prints (rpc.rexd) */
74*0Sstevel@tonic-gate sprintf(tohere, "%s@%s", user, host);
75*0Sstevel@tonic-gate while (*tohere++) /* Skip to end of printf output */
76*0Sstevel@tonic-gate ;
77*0Sstevel@tonic-gate while (tohere < LastArgv) /* Avoid confusing ps */
78*0Sstevel@tonic-gate *tohere++ = ' ';
79*0Sstevel@tonic-gate }
80*0Sstevel@tonic-gate
81*0Sstevel@tonic-gate
82*0Sstevel@tonic-gate void
main(argc,argv)83*0Sstevel@tonic-gate main(argc, argv)
84*0Sstevel@tonic-gate int argc;
85*0Sstevel@tonic-gate char **argv;
86*0Sstevel@tonic-gate {
87*0Sstevel@tonic-gate static char usage[] = "Usage: under [-d] dir command...\n";
88*0Sstevel@tonic-gate char *dir, *p;
89*0Sstevel@tonic-gate char hostname[255];
90*0Sstevel@tonic-gate char *tmpdir, *subdir, *parsefs();
91*0Sstevel@tonic-gate char dirbuf[1024];
92*0Sstevel@tonic-gate char error[1024];
93*0Sstevel@tonic-gate int status;
94*0Sstevel@tonic-gate int len;
95*0Sstevel@tonic-gate
96*0Sstevel@tonic-gate if (argc < 3)
97*0Sstevel@tonic-gate {
98*0Sstevel@tonic-gate fprintf(stderr, usage);
99*0Sstevel@tonic-gate exit(1);
100*0Sstevel@tonic-gate }
101*0Sstevel@tonic-gate
102*0Sstevel@tonic-gate /*
103*0Sstevel@tonic-gate * argv start and extent for setproctitle()
104*0Sstevel@tonic-gate */
105*0Sstevel@tonic-gate Argv = argv;
106*0Sstevel@tonic-gate if (argc > 0)
107*0Sstevel@tonic-gate LastArgv = argv[argc-1] + strlen(argv[argc-1]);
108*0Sstevel@tonic-gate else
109*0Sstevel@tonic-gate LastArgv = NULL;
110*0Sstevel@tonic-gate
111*0Sstevel@tonic-gate gethostname(hostname, 255);
112*0Sstevel@tonic-gate strcat(hostname, ":/");
113*0Sstevel@tonic-gate len = strlen(hostname);
114*0Sstevel@tonic-gate if ( strcmp( argv[1], "-d" ) == 0 )
115*0Sstevel@tonic-gate {
116*0Sstevel@tonic-gate Debug = 1;
117*0Sstevel@tonic-gate argv++;
118*0Sstevel@tonic-gate }
119*0Sstevel@tonic-gate dir = argv[1];
120*0Sstevel@tonic-gate if ( (int)strlen(dir) > len && (int)strncmp(dir, hostname, len) == 0)
121*0Sstevel@tonic-gate dir = strchr(dir, ':') + 1;
122*0Sstevel@tonic-gate else if (p = strchr(dir, ':'))
123*0Sstevel@tonic-gate {
124*0Sstevel@tonic-gate if (p[1] != '/')
125*0Sstevel@tonic-gate {
126*0Sstevel@tonic-gate fprintf(stderr, "under: %s invalid name\n", dir);
127*0Sstevel@tonic-gate exit(1);
128*0Sstevel@tonic-gate }
129*0Sstevel@tonic-gate
130*0Sstevel@tonic-gate tmpdir = mktemp("/tmp/underXXXXXX");
131*0Sstevel@tonic-gate
132*0Sstevel@tonic-gate if ( Debug && errno )
133*0Sstevel@tonic-gate {
134*0Sstevel@tonic-gate if ( errno != ENOENT )
135*0Sstevel@tonic-gate printf("mktemp of %s returned %d %s\n",
136*0Sstevel@tonic-gate tmpdir, errno, strerror(errno));
137*0Sstevel@tonic-gate }
138*0Sstevel@tonic-gate errno = 0; /* XXX access() call in mktemp sets errno = ENOENT */
139*0Sstevel@tonic-gate
140*0Sstevel@tonic-gate if (mkdir(tmpdir, 0777))
141*0Sstevel@tonic-gate {
142*0Sstevel@tonic-gate perror(tmpdir);
143*0Sstevel@tonic-gate exit(1);
144*0Sstevel@tonic-gate }
145*0Sstevel@tonic-gate
146*0Sstevel@tonic-gate if ( Debug && errno )
147*0Sstevel@tonic-gate printf("mkdir of %s returned %d %s\n",
148*0Sstevel@tonic-gate tmpdir, errno, strerror(errno));
149*0Sstevel@tonic-gate
150*0Sstevel@tonic-gate subdir = parsefs(dir, error);
151*0Sstevel@tonic-gate if (subdir == NULL)
152*0Sstevel@tonic-gate {
153*0Sstevel@tonic-gate exit(1);
154*0Sstevel@tonic-gate }
155*0Sstevel@tonic-gate time_now = time((long *) 0);
156*0Sstevel@tonic-gate if (mount_nfs(dir, tmpdir, error))
157*0Sstevel@tonic-gate {
158*0Sstevel@tonic-gate exit(1);
159*0Sstevel@tonic-gate }
160*0Sstevel@tonic-gate strcpy(dirbuf, tmpdir);
161*0Sstevel@tonic-gate strcat(dirbuf, "/");
162*0Sstevel@tonic-gate strcat(dirbuf, subdir);
163*0Sstevel@tonic-gate status = runcmd(dirbuf, argv[2], &argv[2]);
164*0Sstevel@tonic-gate if (umount_nfs(dir, tmpdir))
165*0Sstevel@tonic-gate fprintf(stderr, "under: couldn't umount %s\n", dir);
166*0Sstevel@tonic-gate rmdir(tmpdir);
167*0Sstevel@tonic-gate exit(status);
168*0Sstevel@tonic-gate }
169*0Sstevel@tonic-gate
170*0Sstevel@tonic-gate setgid(getgid());
171*0Sstevel@tonic-gate setuid(getuid());
172*0Sstevel@tonic-gate if (chdir(dir))
173*0Sstevel@tonic-gate {
174*0Sstevel@tonic-gate perror(dir);
175*0Sstevel@tonic-gate exit(1);
176*0Sstevel@tonic-gate }
177*0Sstevel@tonic-gate execvp(argv[2], &argv[2]);
178*0Sstevel@tonic-gate perror(argv[2]);
179*0Sstevel@tonic-gate exit(1);
180*0Sstevel@tonic-gate /* NOTREACHED */
181*0Sstevel@tonic-gate }
182*0Sstevel@tonic-gate
183*0Sstevel@tonic-gate typedef void (*sig_t)();
184*0Sstevel@tonic-gate
185*0Sstevel@tonic-gate int
runcmd(dir,cmd,args)186*0Sstevel@tonic-gate runcmd(dir, cmd, args)
187*0Sstevel@tonic-gate char *dir;
188*0Sstevel@tonic-gate char *cmd;
189*0Sstevel@tonic-gate char **args;
190*0Sstevel@tonic-gate {
191*0Sstevel@tonic-gate int pid, child, status;
192*0Sstevel@tonic-gate sig_t sigint, sigquit;
193*0Sstevel@tonic-gate
194*0Sstevel@tonic-gate sigint = sigset(SIGINT, SIG_IGN);
195*0Sstevel@tonic-gate sigquit = sigset(SIGQUIT, SIG_IGN);
196*0Sstevel@tonic-gate pid = fork();
197*0Sstevel@tonic-gate if (pid == -1)
198*0Sstevel@tonic-gate return (0177);
199*0Sstevel@tonic-gate if (pid == 0)
200*0Sstevel@tonic-gate {
201*0Sstevel@tonic-gate setgid(getgid());
202*0Sstevel@tonic-gate setuid(getuid());
203*0Sstevel@tonic-gate if (chdir(dir))
204*0Sstevel@tonic-gate {
205*0Sstevel@tonic-gate perror(dir);
206*0Sstevel@tonic-gate exit(1);
207*0Sstevel@tonic-gate }
208*0Sstevel@tonic-gate (void) sigset(SIGINT, sigint);
209*0Sstevel@tonic-gate (void) sigset(SIGQUIT, sigquit);
210*0Sstevel@tonic-gate execvp(cmd, args);
211*0Sstevel@tonic-gate perror(cmd);
212*0Sstevel@tonic-gate exit(1);
213*0Sstevel@tonic-gate }
214*0Sstevel@tonic-gate while ((child = wait(&status)) != pid && child != -1)
215*0Sstevel@tonic-gate ;
216*0Sstevel@tonic-gate (void) sigset(SIGINT, sigint);
217*0Sstevel@tonic-gate (void) sigset(SIGQUIT, sigquit);
218*0Sstevel@tonic-gate if (child == -1)
219*0Sstevel@tonic-gate return (0177);
220*0Sstevel@tonic-gate if (status & 0377)
221*0Sstevel@tonic-gate return (status & 0377);
222*0Sstevel@tonic-gate return ((status >> 8) & 0377);
223*0Sstevel@tonic-gate }
224