/* $NetBSD: rkpty.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */
/*
* Copyright (c) 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* 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. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*/
#include "config.h"
#ifndef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_PTY_H
#include <pty.h>
#endif
#ifdef HAVE_UTIL_H
#include <util.h>
#endif
#ifdef HAVE_LIBUTIL_H
#include <libutil.h>
#endif
#ifdef STREAMSPTY
#include <stropts.h>
#endif /* STREAMPTY */
#include <krb5/roken.h>
#include <krb5/getarg.h>
struct command {
enum { CMD_EXPECT = 0, CMD_SEND, CMD_PASSWORD } type;
unsigned int lineno;
char *str;
struct command *next;
};
/*
*
*/
static struct command *commands, **next = &commands;
static sig_atomic_t alarmset = 0;
static int timeout = 10;
static int verbose;
static int help_flag;
static int version_flag;
static int master;
static int slave;
static char line[256] = { 0 };
static void
caught_signal(int signo)
{
alarmset = signo;
}
static void
open_pty(void)
{
#ifdef _AIX
printf("implement open_pty\n");
exit(77);
#endif
#if defined(HAVE_OPENPTY) || defined(__osf__) /* XXX */
if(openpty(&master, &slave, line, 0, 0) == 0)
return;
#endif /* HAVE_OPENPTY .... */
#ifdef STREAMSPTY
{
char *clone[] = {
"/dev/ptc",
"/dev/ptmx",
"/dev/ptm",
"/dev/ptym/clone",
NULL
};
char **q;
for(q = clone; *q; q++){
master = open(*q, O_RDWR);
if(master >= 0){
#ifdef HAVE_GRANTPT
grantpt(master);
#endif
#ifdef HAVE_UNLOCKPT
unlockpt(master);
#endif
strlcpy(line, ptsname(master), sizeof(line));
slave = open(line, O_RDWR);
if (slave < 0)
errx(1, "failed to open slave when using %s", *q);
ioctl(slave, I_PUSH, "ptem");
ioctl(slave, I_PUSH, "ldterm");
return;
}
}
}
#endif /* STREAMSPTY */
/* more cases, like open /dev/ptmx, etc */
exit(77);
}
/*
*
*/
static char *
iscmd(const char *buf, const char *s)
{
size_t len = strlen(s);
if (strncmp(buf, s, len) != 0)
return NULL;
return estrdup(buf + len);
}
static void
parse_configuration(const char *fn)
{
struct command *c;
char s[1024];
char *str;
unsigned int lineno = 0;
FILE *cmd;
cmd = fopen(fn, "r");
if (cmd == NULL)
err(1, "open: %s", fn);
while (fgets(s, sizeof(s), cmd) != NULL) {
s[strcspn(s, "#\n")] = '\0';
lineno++;
c = calloc(1, sizeof(*c));
if (c == NULL)
errx(1, "malloc");
c->lineno = lineno;
(*next) = c;
next = &(c->next);
if ((str = iscmd(s, "expect ")) != NULL) {
c->type = CMD_EXPECT;
c->str = str;
} else if ((str = iscmd(s, "send ")) != NULL) {
c->type = CMD_SEND;
c->str = str;
} else if ((str = iscmd(s, "password ")) != NULL) {
c->type = CMD_PASSWORD;
c->str = str;
} else
errx(1, "Invalid command on line %d: %s", lineno, s);
}
fclose(cmd);
}
/*
*
*/
static int
eval_parent(pid_t pid)
{
struct command *c;
char in;
size_t len = 0;
ssize_t sret;
for (c = commands; c != NULL; c = c->next) {
switch(c->type) {
case CMD_EXPECT:
if (verbose)
printf("[expecting %s]", c->str);
len = 0;
alarm(timeout);
while((sret = read(master, &in, sizeof(in))) > 0) {
alarm(timeout);
printf("%c", in);
if (c->str[len] != in) {
len = 0;
continue;
}
len++;
if (c->str[len] == '\0')
break;
}
alarm(0);
if (alarmset == SIGALRM)
errx(1, "timeout waiting for %s (line %u)",
c->str, c->lineno);
else if (alarmset)
errx(1, "got a signal %d waiting for %s (line %u)",
(int)alarmset, c->str, c->lineno);
if (sret <= 0)
errx(1, "end command while waiting for %s (line %u)",
c->str, c->lineno);
break;
case CMD_SEND:
case CMD_PASSWORD: {
size_t i = 0;
const char *msg = (c->type == CMD_PASSWORD) ? "****" : c->str;
if (verbose)
printf("[send %s]", msg);
len = strlen(c->str);
while (i < len) {
if (c->str[i] == '\\' && i < len - 1) {
char ctrl;
i++;
switch(c->str[i]) {
case 'n': ctrl = '\n'; break;
case 'r': ctrl = '\r'; break;
case 't': ctrl = '\t'; break;
default:
errx(1, "unknown control char %c (line %u)",
c->str[i], c->lineno);
}
if (net_write(master, &ctrl, 1) != 1)
errx(1, "command refused input (line %u)", c->lineno);
} else {
if (net_write(master, &c->str[i], 1) != 1)
errx(1, "command refused input (line %u)", c->lineno);
}
i++;
}
break;
}
default:
abort();
}
}
while(read(master, &in, sizeof(in)) > 0)
printf("%c", in);
if (verbose)
printf("[end of program]\n");
/*
* Fetch status from child
*/
{
int ret, status;
ret = waitpid(pid, &status, 0);
if (ret == -1)
err(1, "waitpid");
if (WIFEXITED(status) && WEXITSTATUS(status))
return WEXITSTATUS(status);
else if (WIFSIGNALED(status)) {
printf("killed by signal: %d\n", WTERMSIG(status));
return 1;
}
}
return 0;
}
/*
*
*/
static struct getargs args[] = {
{ "timeout", 't', arg_integer, &timeout, "timout", "seconds" },
{ "verbose", 'v', arg_counter, &verbose, "verbose debugging", NULL },
{ "version", 0, arg_flag, &version_flag, "print version", NULL },
{ "help", 0, arg_flag, &help_flag, NULL, NULL }
};
static void
usage(int ret)
{
arg_printusage (args, sizeof(args)/sizeof(*args), NULL, "infile command..");
exit (ret);
}
int
main(int argc, char **argv)
{
int optidx = 0;
pid_t pid;
setprogname(argv[0]);
if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
usage(1);
if (help_flag)
usage (0);
if (version_flag) {
fprintf (stderr, "%s from %s-%s\n", getprogname(), PACKAGE, VERSION);
return 0;
}
argv += optidx;
argc -= optidx;
if (argc < 2)
usage(1);
parse_configuration(argv[0]);
argv += 1;
open_pty();
pid = fork();
switch (pid) {
case -1:
err(1, "Failed to fork");
case 0:
if(setsid()<0)
err(1, "setsid");
dup2(slave, STDIN_FILENO);
dup2(slave, STDOUT_FILENO);
dup2(slave, STDERR_FILENO);
closefrom(STDERR_FILENO + 1);
execvp(argv[0], argv); /* add NULL to end of array ? */
err(1, "Failed to exec: %s", argv[0]);
default:
close(slave);
{
struct sigaction sa;
sa.sa_handler = caught_signal;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
sigaction(SIGALRM, &sa, NULL);
}
return eval_parent(pid);
}
}