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/* $OpenBSD: misc.c,v 1.8 2017/12/18 09:12:49 job Exp $ */
/*
* Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include "bgplg.h"
static volatile pid_t child = -1;
int
lg_checkperm(struct cmd *cmd)
{
struct stat stbuf;
/* No external command to execute, this is always valid */
if (cmd->earg[0] == NULL)
return (1);
/*
* Skip commands if the executable is missing or
* the permission mode has been set to zero (the default
* in a CGI environment).
*/
if (stat(cmd->earg[0], &stbuf) != 0 ||
(stbuf.st_mode & ~S_IFMT) == 0)
return (0);
return (1);
}
int
lg_help(struct cmd *cmds, char **argv)
{
u_int i;
printf("valid commands:\n");
for (i = 0; cmds[i].name != NULL; i++) {
if (!lg_checkperm(&cmds[i]))
continue;
printf(" %s", cmds[i].name);
if (cmds[i].minargs > 0)
printf(" { arg }");
else if (cmds[i].maxargs > 0)
printf(" [ arg ]");
printf("\n");
}
return (0);
}
void
lg_sig_alarm(int sig)
{
if (child != -1) {
/* Forcibly kill the child, no excuse... */
kill(child, SIGKILL);
}
}
int
lg_exec(const char *file, char **new_argv)
{
int status = 0, ret = 0;
sig_t save_quit, save_int, save_chld;
struct itimerval it;
if (new_argv == NULL)
return (EFAULT);
save_quit = signal(SIGQUIT, SIG_IGN);
save_int = signal(SIGINT, SIG_IGN);
save_chld = signal(SIGCHLD, SIG_DFL);
switch (child = fork()) {
case -1:
ret = errno;
goto done;
case 0:
signal(SIGQUIT, SIG_DFL);
signal(SIGINT, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
execvp(file, new_argv);
_exit(127);
break;
default:
/* Kill the process after a timeout */
signal(SIGALRM, lg_sig_alarm);
bzero(&it, sizeof(it));
it.it_value.tv_sec = BGPLG_TIMEOUT;
setitimer(ITIMER_REAL, &it, NULL);
waitpid(child, &status, 0);
break;
}
switch (ret) {
case -1:
ret = ECHILD;
break;
default:
if (WIFEXITED(status))
ret = WEXITSTATUS(status);
else
ret = ECHILD;
}
done:
/* Disable the process timeout timer */
bzero(&it, sizeof(it));
setitimer(ITIMER_REAL, &it, NULL);
child = -1;
signal(SIGQUIT, save_quit);
signal(SIGINT, save_int);
signal(SIGCHLD, save_chld);
signal(SIGALRM, SIG_DFL);
return (ret);
}
ssize_t
lg_strip(char *str)
{
size_t len;
if ((len = strlen(str)) < 1)
return (0); /* XXX EINVAL? */
if (isspace((unsigned char)str[len - 1])) {
str[len - 1] = '\0';
return (lg_strip(str));
}
return (strlen(str));
}
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