NetBSD/libexec/ftpd/popen.c

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1993-03-21 12:45:37 +03:00
/*
* 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
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/*static char sccsid[] = "from: @(#)popen.c 5.9 (Berkeley) 2/25/91";*/
static char rcsid[] = "$Id: popen.c,v 1.2 1993/08/01 18:30:43 mycroft Exp $";
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#endif /* not lint */
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
* 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;
FILE *
ftpd_popen(program, type)
char *program, *type;
{
register char *cp;
FILE *iop;
int argc, gargc, pdes[2], pid;
char **pop, *argv[100], *gargv[1000], *vv[2];
extern char **ftpglob(), **copyblk();
if (*type != 'r' && *type != 'w' || type[1])
return(NULL);
if (!pids) {
if ((fds = getdtablesize()) <= 0)
return(NULL);
if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL)
return(NULL);
bzero((char *)pids, fds * sizeof(int));
}
if (pipe(pdes) < 0)
return(NULL);
/* break up string into pieces */
for (argc = 0, cp = program;; 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] = argv[argc];
vv[1] = NULL;
pop = copyblk(vv);
}
argv[argc] = (char *)pop; /* save to free later */
while (*pop && gargc < 1000)
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);
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]);
}
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);
}
ftpd_pclose(iop)
FILE *iop;
{
register int fdes;
int omask;
union wait stat_loc;
int pid;
/*
* 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);
omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
while ((pid = wait((int *)&stat_loc)) != pids[fdes] && pid != -1);
(void)sigsetmask(omask);
pids[fdes] = 0;
return(pid == -1 ? -1 : stat_loc.w_status);
}