freebsd-dev/usr.sbin/ppp/exec.c
1999-08-28 01:35:59 +00:00

167 lines
4.4 KiB
C

/*-
* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/uio.h>
#include <termios.h>
#include <unistd.h>
#include "layer.h"
#include "defs.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "lqr.h"
#include "hdlc.h"
#include "throughput.h"
#include "fsm.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "async.h"
#include "descriptor.h"
#include "physical.h"
#include "mp.h"
#include "chat.h"
#include "command.h"
#include "auth.h"
#include "chap.h"
#include "cbcp.h"
#include "datalink.h"
#include "exec.h"
static struct device execdevice = {
EXEC_DEVICE,
"exec",
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
struct device *
exec_iov2device(int type, struct physical *p, struct iovec *iov,
int *niov, int maxiov)
{
if (type == EXEC_DEVICE) {
free(iov[(*niov)++].iov_base);
physical_SetupStack(p, execdevice.name, PHYSICAL_FORCE_ASYNC);
return &execdevice;
}
return NULL;
}
struct device *
exec_Create(struct physical *p)
{
if (p->fd < 0 && *p->name.full == '!') {
int fids[2];
if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, fids) < 0)
log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n",
strerror(errno));
else {
int stat, argc, i;
pid_t pid, realpid;
char *argv[MAXARGS];
stat = fcntl(fids[0], F_GETFL, 0);
if (stat > 0) {
stat |= O_NONBLOCK;
fcntl(fids[0], F_SETFL, stat);
}
realpid = getpid();
switch ((pid = fork())) {
case -1:
log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n",
strerror(errno));
break;
case 0:
close(fids[0]);
timer_TermService();
setuid(geteuid());
switch (fork()) {
case 0:
break;
case -1:
log_Printf(LogPHASE, "Unable to fork to drop parent: %s\n",
strerror(errno));
default:
_exit(127);
}
log_Printf(LogDEBUG, "Exec'ing ``%s''\n", p->name.base);
dup2(fids[1], STDIN_FILENO);
dup2(fids[1], STDOUT_FILENO);
dup2(fids[1], STDERR_FILENO);
for (i = getdtablesize(); i > STDERR_FILENO; i--)
fcntl(i, F_SETFD, 1);
argc = MakeArgs(p->name.base, argv, VECSIZE(argv));
command_Expand(argv, argc, (char const *const *)argv,
p->dl->bundle, 0, realpid);
execvp(*argv, argv);
printf("execvp failed: %s: %s\r\n", *argv, strerror(errno));
_exit(127);
break;
default:
close(fids[1]);
p->fd = fids[0];
waitpid(pid, &stat, 0);
log_Printf(LogDEBUG, "Using descriptor %d for child\n", p->fd);
physical_SetupStack(p, execdevice.name, PHYSICAL_FORCE_ASYNC);
return &execdevice;
}
}
}
return NULL;
}