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Current Path: /usr/src/contrib/tcp_wrappers

📁 ..
📄 BLURB(1.7 KB)
📄 Banners.Makefile(2.17 KB)
📄 CHANGES(18.75 KB)
📄 DISCLAIMER(1.21 KB)
📄 Makefile(32.68 KB)
📄 README(47.08 KB)
📄 README.IRIX(2.57 KB)
📄 README.NIS(6.52 KB)
📄 clean_exit.c(1.07 KB)
📄 diag.c(1.44 KB)
📄 environ.c(4.75 KB)
📄 eval.c(3.59 KB)
📄 fakelog.c(1012 B)
📄 fix_options.c(3.7 KB)
📄 fromhost.c(1.37 KB)
📄 hosts_access.3(3.52 KB)
📄 hosts_access.5(15.97 KB)
📄 hosts_access.c(14.13 KB)
📄 hosts_ctl.c(1.08 KB)
📄 hosts_options.5(6.5 KB)
📄 inetcf.c(8.03 KB)
📄 inetcf.h(516 B)
📄 misc.c(1.9 KB)
📄 miscd.c(3.07 KB)
📄 mystdarg.h(571 B)
📄 myvsyslog.c(766 B)
📄 ncr.c(2.52 KB)
📄 options.c(13.85 KB)
📄 patchlevel.h(88 B)
📄 percent_m.c(797 B)
📄 percent_x.c(2.37 KB)
📄 printf.ck(39 B)
📄 ptx.c(2.65 KB)
📄 refuse.c(911 B)
📄 rfc931.c(5.95 KB)
📄 safe_finger.c(4.98 KB)
📄 scaffold.c(6.38 KB)
📄 scaffold.h(370 B)
📄 setenv.c(931 B)
📄 shell_cmd.c(2.13 KB)
📄 socket.c(12.06 KB)
📄 strcasecmp.c(3.78 KB)
📄 tcpd.8(6.86 KB)
📄 tcpd.c(3.49 KB)
📄 tcpd.h(8.18 KB)
📄 tcpdchk.8(2.51 KB)
📄 tcpdchk.c(12.84 KB)
📄 tcpdmatch.8(3.18 KB)
📄 tcpdmatch.c(10.69 KB)
📄 tli-sequent.c(4.85 KB)
📄 tli-sequent.h(411 B)
📄 tli.c(10.34 KB)
📄 try-from.c(2.01 KB)
📄 update.c(3.05 KB)
📄 vfprintf.c(3.12 KB)
📄 workarounds.c(7.57 KB)

Editing: shell_cmd.c

/*
  * shell_cmd() takes a shell command after %<character> substitutions. The
  * command is executed by a /bin/sh child process, with standard input,
  * standard output and standard error connected to /dev/null.
  * 
  * Diagnostics are reported through syslog(3).
  * 
  * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  */

#ifndef lint
static char sccsid[] = "@(#) shell_cmd.c 1.5 94/12/28 17:42:44";
#endif

/* System libraries. */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdio.h>
#include <syslog.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

extern void exit();

/* Local stuff. */

#include "tcpd.h"

/* Forward declarations. */

static void do_child(char *command);

/* shell_cmd - execute shell command */

void    shell_cmd(command)
char   *command;
{
    int     child_pid;
    int     wait_pid;

/*
     * Most of the work is done within the child process, to minimize the
     * risk of damage to the parent.
     */

switch (child_pid = fork()) {
    case -1:					/* error */
	tcpd_warn("cannot fork: %m");
	break;
    case 00:					/* child */
	do_child(command);
	/* NOTREACHED */
    default:					/* parent */
	while ((wait_pid = wait((int *) 0)) != -1 && wait_pid != child_pid)
	     /* void */ ;
    }
}

/* do_child - exec command with { stdin, stdout, stderr } to /dev/null */

static void do_child(char *command)
{
    char   *error;
    int     tmp_fd;

/*
     * Systems with POSIX sessions may send a SIGHUP to grandchildren if the
     * child exits first. This is sick, sessions were invented for terminals.
     */

signal(SIGHUP, SIG_IGN);

/* Set up new stdin, stdout, stderr, and exec the shell command. */

for (tmp_fd = 0; tmp_fd < 3; tmp_fd++)
	(void) close(tmp_fd);
    if (open("/dev/null", 2) != 0) {
	error = "open /dev/null: %m";
    } else if (dup(0) != 1 || dup(0) != 2) {
	error = "dup: %m";
    } else {
	(void) execl("/bin/sh", "sh", "-c", command, (char *) 0);
	error = "execl /bin/sh: %m";
    }

/* Something went wrong. We MUST terminate the child process. */

tcpd_warn(error);
    _exit(0);
}

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Editing: shell_cmd.c

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