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/*
* Copyright (C) Michel Arboi 2002
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include "system.h"
#ifndef RLIM_INFINITY
#define RLIM_INFINITY (1024*1024*1024)
#endif
FILE*
nessus_popen4(const char* cmd, char *const args[], pid_t* ppid, int inice)
{
int fd, pipes[2];
pid_t son;
FILE *fp;
#if DEBUG
int i;
fprintf(stderr, "nessus_popen: running %s -", cmd);
for (i = 0; args[i] != NULL; i ++)
fprintf(stderr, " %s", args[i]);
fputc('\n', stderr);
#endif
#if 0
{
char buffer[1024], *p;
int n, sz = sizeof(buffer)-1;
n = snprintf(buffer, sz, "%s", cmd);
if (n > 0)
{
p = buffer + n;
sz -= n;
}
for (i = 0; args[i] != NULL && sz > 0; i ++)
{
n = snprintf(p, sz, " %s", args[i]);
if (n > 0)
{
p = buffer + n;
sz -= n;
}
}
*p ++ = '\0';
log_write("nessus_popen: %s", buffer);
}
#endif
/* pipe() does not always work well on some OS */
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipes) < 0)
{
perror("socketpair");
return NULL;
/* filedes[0] is for reading, filedes[1] is for writing. */
}
if ((son = fork()) < 0)
{
perror("fork");
close(pipes[0]); close(pipes[1]);
return NULL;
}
if (son == 0)
{
struct rlimit rl;
int i;
/* Child process */
if (inice)
{
errno = 0;
/* Some systems returned the new nice value => it may be < 0 */
if (nice(inice) < 0 && errno)
perror("nice");
}
/* Memory usage: unlimited */
rl.rlim_cur = rl.rlim_max = RLIM_INFINITY;
#ifdef RLIMIT_DATA
if (setrlimit(RLIMIT_DATA, &rl) < 0) perror("RLIMIT_DATA");
#endif
#ifdef RLIMIT_RSS
if (setrlimit(RLIMIT_RSS, &rl) < 0) perror("RLIMIT_RSS");
#endif
#ifdef RLIMIT_STACK
if (setrlimit(RLIMIT_STACK, &rl) < 0) perror("RLIMIT_STACK");
#endif
/* We could probably limit the CPU time, but to which value? */
if ((fd = open("/dev/null", O_RDONLY)) < 0)
{
perror("/dev/null");
exit(1);
}
close(0);
if (dup2(fd, 0) < 0)
{
perror("dup2");
exit(1);
}
close(fd);
close(1);
close(2);
if (dup2(pipes[1], 1) < 0 ||
dup2(pipes[1], 2) < 0)
{
/* Cannot print error as 2 is closed! */
exit(1);
}
/*
* Close all the fd's
*/
for(i=3;i<256;i++)
{
close(i);
}
signal(SIGTERM, _exit);
signal(SIGPIPE, _exit);
execvp(cmd, args);
perror("execvp");
_exit(1);
}
close(pipes[1]);
if ((fp = fdopen(pipes[0], "r")) == NULL)
{
perror("fdopen");
close(pipes[0]);
return NULL;
}
if (ppid != NULL) *ppid = son;
return fp;
}
FILE*
nessus_popen(const char* cmd, char *const args[], pid_t* ppid)
{
return nessus_popen4(cmd, args, ppid, 0);
}
int
nessus_pclose(FILE* fp, pid_t pid)
{
if (pid > 0)
if (waitpid(pid, NULL, WNOHANG) == 0)
if (kill(pid, SIGTERM) >= 0)
if (waitpid(pid, NULL, WNOHANG) == 0)
{
usleep(400);
(void) kill(pid, SIGKILL);
(void) waitpid(pid, NULL, WNOHANG);
}
return fclose(fp);
}
/* Code taken from ptycall by Jordan Hrycaj */
char** append_argv(char **argv, char *opt)
{
int argc, n ;
/* special case */
if (opt == 0) {
if (argv == 0)
(argv = emalloc(sizeof (char*))) [0] = 0 ;
return argv ;
}
if (argv == 0) {
argc = 1 ;
argv = emalloc(2 * sizeof (char*));
} else {
/* calculate dim (argv) - 1 */
argc = 0 ;
while (argv [argc ++] != 0)
;
/* append one more item */
n = (++ argc) * sizeof (char*) ;
argv = erealloc(argv, n) ;
argv [-- argc] = 0 ;
}
/* append one duplicated item before the NULL entry */
argv [-- argc] = estrdup(opt);
return argv ;
}
void destroy_argv(char **argv)
{
int argc ;
if (argv == 0)
return ;
for (argc = 0; argv [argc] != 0; argc ++)
efree (&argv [argc]) ;
efree (&argv);
}
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