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/*
* Copyright (c) 1988, 1993, 1994
* 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.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
RCSID("$Id: popen.c,v 1.26 2002/04/02 11:57:39 joda Exp $");
#endif
#include <sys/types.h>
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#elif defined(HAVE_SYS_TIME_H)
#include <sys/time.h>
#else
#include <time.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#include <sys/wait.h>
#include <errno.h>
#include <glob.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <roken.h>
#include "extern.h"
/*
* Special version of popen which avoids call to shell. This ensures
* no one may create a pipe to a hidden program as a side effect of a
* list or dir command.
*/
static int *pids;
static int fds;
extern int dochroot;
/* return path prepended with ~ftp if that file exists, otherwise
* return path unchanged
*/
const char *
ftp_rooted(const char *path)
{
static char home[MaxPathLen] = "";
static char newpath[MaxPathLen];
struct passwd *pwd;
if(!home[0])
if((pwd = k_getpwnam("ftp")))
strlcpy(home, pwd->pw_dir, sizeof(home));
snprintf(newpath, sizeof(newpath), "%s/%s", home, path);
if(access(newpath, X_OK))
strlcpy(newpath, path, sizeof(newpath));
return newpath;
}
#define MAXARGS 100
#define MAXGLOBS 1000
FILE *
ftpd_popen(char *program, char *type, int do_stderr, int no_glob)
{
char *cp;
FILE *iop;
int argc, gargc, pdes[2], pid;
char **pop, *argv[MAXARGS], *gargv[MAXGLOBS];
char *foo;
if (strcmp(type, "r") && strcmp(type, "w"))
return (NULL);
if (!pids) {
/* This function is ugly and should be rewritten, in
* modern unices there is no such thing as a maximum
* filedescriptor.
*/
fds = getdtablesize();
pids = (int*)calloc(fds, sizeof(int));
if(!pids)
return NULL;
}
if (pipe(pdes) < 0)
return (NULL);
/* break up string into pieces */
foo = NULL;
for (argc = 0, cp = program; argc < MAXARGS - 1; cp = NULL) {
if (!(argv[argc++] = strtok_r(cp, " \t\n", &foo)))
break;
}
argv[MAXARGS - 1] = NULL;
gargv[0] = (char*)ftp_rooted(argv[0]);
/* glob each piece */
for (gargc = argc = 1; argv[argc] && gargc < MAXGLOBS - 1; argc++) {
glob_t gl;
int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE
|
#ifdef GLOB_MAXPATH
GLOB_MAXPATH
#else
GLOB_LIMIT
#endif
;
memset(&gl, 0, sizeof(gl));
if (no_glob ||
glob(argv[argc], flags, NULL, &gl) ||
gl.gl_pathc == 0)
gargv[gargc++] = strdup(argv[argc]);
else
for (pop = gl.gl_pathv;
*pop && gargc < MAXGLOBS - 1;
pop++)
gargv[gargc++] = strdup(*pop);
globfree(&gl);
}
gargv[gargc] = NULL;
iop = NULL;
switch(pid = fork()) {
case -1: /* error */
close(pdes[0]);
close(pdes[1]);
goto pfree;
/* NOTREACHED */
case 0: /* child */
if (*type == 'r') {
if (pdes[1] != STDOUT_FILENO) {
dup2(pdes[1], STDOUT_FILENO);
close(pdes[1]);
}
if(do_stderr)
dup2(STDOUT_FILENO, STDERR_FILENO);
close(pdes[0]);
} else {
if (pdes[0] != STDIN_FILENO) {
dup2(pdes[0], STDIN_FILENO);
close(pdes[0]);
}
close(pdes[1]);
}
execv(gargv[0], gargv);
gargv[0] = argv[0];
execv(gargv[0], gargv);
_exit(1);
}
/* parent; assume fdopen can't fail... */
if (*type == 'r') {
iop = fdopen(pdes[0], type);
close(pdes[1]);
} else {
iop = fdopen(pdes[1], type);
close(pdes[0]);
}
pids[fileno(iop)] = pid;
pfree:
for (argc = 1; gargv[argc] != NULL; argc++)
free(gargv[argc]);
return (iop);
}
int
ftpd_pclose(FILE *iop)
{
int fdes, status;
pid_t pid;
sigset_t sigset, osigset;
/*
* 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);
fclose(iop);
sigemptyset(&sigset);
sigaddset(&sigset, SIGINT);
sigaddset(&sigset, SIGQUIT);
sigaddset(&sigset, SIGHUP);
sigprocmask(SIG_BLOCK, &sigset, &osigset);
while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
continue;
sigprocmask(SIG_SETMASK, &osigset, NULL);
pids[fdes] = 0;
if (pid < 0)
return (pid);
if (WIFEXITED(status))
return (WEXITSTATUS(status));
return (1);
}
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