2 * Copyright (c) 1988 The Regents of the University of California.
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by the University of California, Berkeley. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 /* this came out of the ftpd sources; it's been modified to avoid the
23 * globbing stuff since we don't need it. also execvp instead of execv.
27 static const char rcsid[] =
28 "$Id: popen.c,v 1.3 1998/08/14 00:32:41 vixie Exp $";
30 static const char sccsid[] = "@(#)popen.c 5.7 (Berkeley) 2/14/89";
35 #if defined(LOGIN_CAP)
36 # include <login_cap.h>
40 #define WANT_GLOBBING 0
43 * Special version of popen which avoids call to shell. This insures no one
44 * may create a pipe to a hidden program as a side effect of a list or dir
51 cron_popen(char *program, char *type, entry *e, PID_T *pidptr)
58 char *argv[MAX_ARGS + 1];
59 # if defined(LOGIN_CAP)
67 extern char **glob(), **copyblk();
70 if ((*type != 'r' && *type != 'w') || type[1] != '\0')
74 if ((fds = sysconf(_SC_OPEN_MAX)) <= 0)
76 if (!(pids = calloc(fds, sizeof(PID_T))))
82 /* break up string into pieces */
83 for (argc = 0, cp = program; argc < MAX_ARGS; cp = NULL)
84 if (!(argv[argc++] = strtok(cp, " \t\n")))
86 argv[MAX_ARGS] = NULL;
91 for (gargc = argc = 1; argv[argc]; argc++) {
92 if (!(pop = glob(argv[argc]))) { /* globbing failed */
97 argv[argc] = (char *)pop; /* save to free later */
98 while (*pop && gargc < 1000)
99 gargv[gargc++] = *pop++;
105 switch(pid = fork()) {
107 (void)close(pdes[0]);
108 (void)close(pdes[1]);
117 /* get new pgrp, void tty, etc.
122 /* Do not share our parent's stdin */
124 (void)open(_PATH_DEVNULL, O_RDWR);
127 dup2(pdes[1], 2); /* stderr, too! */
128 (void)close(pdes[1]);
130 (void)close(pdes[0]);
134 (void)close(pdes[0]);
136 /* Hack: stdout gets revoked */
138 (void)open(_PATH_DEVNULL, O_RDWR);
140 (void)open(_PATH_DEVNULL, O_RDWR);
141 (void)close(pdes[1]);
144 /* Set user's entire context, but skip the environment
145 * as cron provides a separate interface for this
147 usernm = env_get("LOGNAME", e->envp);
148 # if defined(LOGIN_CAP)
149 if ((pwd = getpwnam(usernm)) == NULL)
150 pwd = getpwuid(e->uid);
153 pwd->pw_gid = e->gid;
154 if (e->class != NULL)
155 lc = login_getclass(e->class);
158 setusercontext(lc, pwd, e->uid,
159 LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETENV)) == 0)
162 /* fall back to the old method */
166 * Set our directory, uid and gid. Set gid
167 * first since once we set uid, we've lost
170 if (setgid(e->gid) != 0)
173 if (initgroups(usernm, e->gid) != 0)
176 if (setlogin(usernm) != 0)
178 if (setuid(e->uid) != 0)
180 /* we aren't root after this..*/
181 #if defined(LOGIN_CAP)
186 chdir(env_get("HOME", e->envp));
189 execvp(gargv[0], gargv);
191 execvp(argv[0], argv);
195 /* parent; assume fdopen can't fail... */
197 iop = fdopen(pdes[0], type);
198 (void)close(pdes[1]);
200 iop = fdopen(pdes[1], type);
201 (void)close(pdes[0]);
203 pids[fileno(iop)] = pid;
207 for (argc = 1; argv[argc] != NULL; argc++) {
208 /* blkfree((char **)argv[argc]); */
209 free((char *)argv[argc]);
219 cron_pclose(FILE *iop)
227 * pclose returns -1 if stream is not associated with a
228 * `popened' command, or, if already `pclosed'.
230 if (pids == 0 || pids[fdes = fileno(iop)] == 0)
233 omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
234 while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1)
236 (void)sigsetmask(omask);
238 return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));