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/* Copyright (c) 1988 The Regents of the University of California. All rights
* reserved.
*
* This code is derived from software written by Ken Arnold and published in
* UNIX Review, Vol. 6, No. 8.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. 2.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution. 3. All advertising
* materials mentioning features or use of this software must display the
* following acknowledgement: This product includes software developed by the
* University of California, Berkeley and its contributors. 4. Neither the
* name of the University nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef lint
static char sccsid[] = "@(#)popen.c 5.9 (Berkeley) 2/25/91";
#endif /* not lint */
#include "config.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_GETRLIMIT
#include <time.h>
#include <sys/resource.h>
#endif
/*
* Special version of popen which avoids call to shell. This insures noone
* may create a pipe to a hidden program as a side effect of a list or dir
* command.
*/
static int *pids;
static int fds;
#define MAX_ARGV 100
#define MAX_GARGV 1000
FILE *
#ifdef __STDC__
ftpd_popen(char *program, char *type, int closestderr)
#else
ftpd_popen(program,type,closestderr)
char *program;
char *type;
int closestderr;
#endif
{
register char *cp;
FILE *iop;
int argc,
gargc,
pdes[2],
pid,i;
char **pop,
*argv[MAX_ARGV],
*gargv[MAX_GARGV],
*vv[2];
#ifdef __STDC__
extern char **ftpglob(register char *v),
**copyblk(register char **v),
*strspl(register char *cp, register char *dp);
#else
extern char **ftpglob(),
**copyblk(),
*strspl();
#endif
#ifdef HAVE_GETRLIMIT
struct rlimit rlp;
rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
if (getrlimit( RLIMIT_NOFILE, &rlp ) )
return(NULL);
fds = rlp.rlim_cur;
#else
#ifdef HAVE_GETDTABLESIZE
if ((fds = getdtablesize()) <= 0)
return (NULL);
#else
#ifdef HAVE_SYSCONF
fds = sysconf(_SC_OPEN_MAX);
#else
#ifdef OPEN_MAX
fds=OPEN_MAX; /* need to include limits.h somehow */
#else
fds = 31; /* XXX -- magic cookie*/
#endif
#endif
#endif
#endif
if (*type != 'r' && *type != 'w' || type[1])
return (NULL);
if (!pids) {
if ((pids = (int *) malloc((u_int) (fds * sizeof(int)))) == NULL)
return (NULL);
#ifdef USG
(void) memset((char *)pids, fds * sizeof(int), 0);
#else
bzero((char *) pids, fds * sizeof(int));
#endif
}
if (pipe(pdes) < 0)
return (NULL);
/* break up string into pieces */
for (argc = 0, cp = program;argc < MAX_ARGV ; cp = NULL)
if (!(argv[argc++] = strtok(cp, " \t\n")))
break;
/* glob each piece */
gargv[0] = argv[0];
for (gargc = argc = 1; argv[argc]; argc++) {
if (!(pop = ftpglob(argv[argc]))) { /* globbing failed */
vv[0] = strspl(argv[argc], "");
vv[1] = NULL;
pop = copyblk(vv);
}
argv[argc] = (char *) pop; /* save to free later */
while (*pop && gargc < (MAX_GARGV - 1 ))
gargv[gargc++] = *pop++;
}
gargv[gargc] = NULL;
iop = NULL;
switch (pid = vfork()) {
case -1: /* error */
(void) close(pdes[0]);
(void) close(pdes[1]);
goto pfree;
/* NOTREACHED */
case 0: /* child */
if (*type == 'r') {
if (pdes[1] != 1) {
dup2(pdes[1], 1);
if (closestderr)
(void) close(2);
else
dup2(pdes[1], 2); /* stderr, too! */
(void) close(pdes[1]);
}
(void) close(pdes[0]);
} else {
if (pdes[0] != 0) {
dup2(pdes[0], 0);
(void) close(pdes[0]);
}
(void) close(pdes[1]);
}
for (i = 3; i < fds; i++)
close(i);
/* begin CERT suggested fixes */
close(0);
i = geteuid();
delay_signaling(); /* we can't allow any signals while euid==0: kinch */
seteuid(0);
setgid(getegid());
setuid(i);
enable_signaling(); /* we can allow signals once again: kinch */
/* end CERT suggested fixes */
execv(gargv[0], gargv);
_exit(1);
}
/* parent; assume fdopen can't fail... */
if (*type == 'r') {
iop = fdopen(pdes[0], type);
(void) close(pdes[1]);
} else {
iop = fdopen(pdes[1], type);
(void) close(pdes[0]);
}
pids[fileno(iop)] = pid;
pfree:for (argc = 1; argv[argc] != NULL; argc++) {
blkfree((char **) argv[argc]);
free((char *) argv[argc]);
}
return (iop);
}
#ifdef __STDC__
ftpd_pclose(FILE * iop)
#else
ftpd_pclose(iop)
FILE * iop;
#endif
{
register int fdes;
int pid;
#if defined (SVR4)
sigset_t sig, omask;
int stat_loc;
sigemptyset(&sig);
sigaddset(&sig, SIGINT); sigaddset(&sig,SIGQUIT); sigaddset(&sig, SIGHUP);
#elif defined (_OSF_SOURCE)
int omask;
int status;
#elif defined(M_UNIX)
int stat_loc;
sigset_t oldmask, newmask;
#else
int omask;
union wait stat_loc;
#endif
/* pclose returns -1 if stream is not associated with a `popened'
* command, or, if already `pclosed'. */
if (pids == 0 || pids[fdes = fileno(iop)] == 0)
return (-1);
(void) fclose(iop);
#ifdef SVR4
sigprocmask( SIG_BLOCK, &sig, &omask);
#elif defined(M_UNIX)
sigemptyset(&newmask);
sigaddset(&newmask, SIGINT);
sigaddset(&newmask, SIGQUIT);
sigaddset(&newmask, SIGHUP);
(void) sigprocmask(SIG_BLOCK, &newmask ,&oldmask);
#else
omask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGHUP));
#endif
#ifdef _OSF_SOURCE
while ((pid = wait(&status)) != pids[fdes] && pid != -1) ;
#else
#ifndef NeXT
while ((pid = wait((int *) &stat_loc)) != pids[fdes] && pid != -1) ;
#else
while ((pid = wait(&stat_loc)) != pids[fdes] && pid != -1) ;
#endif
#endif
pids[fdes] = 0;
#ifdef SVR4
sigprocmask( SIG_SETMASK, &omask, (sigset_t *)NULL);
return(pid == -1 ? -1 : WEXITSTATUS(stat_loc));
#elif defined(M_UNIX)
(void) sigprocmask(SIG_SETMASK, &oldmask, (sigset_t)0);
#else
(void)sigsetmask(omask);
#ifdef _OSF_SOURCE
return (pid == -1 ? -1 : status);
#elif defined(M_UNIX) || defined(LINUX)
return (pid == -1 ? -1 : WEXITSTATUS(stat_loc));
#else
return (pid == -1 ? -1 : stat_loc.w_status);
#endif
#endif
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.