c8b9fb53a1
allow MRU/MTU negotiations to exceed 1492. Add an optional ``max'' specifier to ``set m[rt]u'', ie. set mtu max 1480 Bump the ppp version number. Sponsored by: Monzoon Networks AG and FreeBSD Services Limited
232 lines
6.8 KiB
C
232 lines
6.8 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 "id.h"
|
|
#include "exec.h"
|
|
|
|
static struct device execdevice = {
|
|
EXEC_DEVICE,
|
|
"exec",
|
|
0,
|
|
{ CD_NOTREQUIRED, 0 },
|
|
NULL,
|
|
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, int *auxfd, int *nauxfd)
|
|
{
|
|
if (type == EXEC_DEVICE) {
|
|
free(iov[(*niov)++].iov_base);
|
|
physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
|
|
return &execdevice;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct device *
|
|
exec_Create(struct physical *p)
|
|
{
|
|
if (p->fd < 0 && *p->name.full == '!') {
|
|
int fids[2], type;
|
|
|
|
p->fd--; /* We own the device but maybe can't use it - change fd */
|
|
type = physical_IsSync(p) ? SOCK_DGRAM : SOCK_STREAM;
|
|
|
|
if (socketpair(AF_UNIX, type, PF_UNSPEC, fids) < 0)
|
|
log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n",
|
|
strerror(errno));
|
|
else {
|
|
static int child_status; /* This variable is abused ! */
|
|
int stat, argc, i, ret, wret, pidpipe[2];
|
|
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();
|
|
if (pipe(pidpipe) == -1) {
|
|
log_Printf(LogPHASE, "Unable to pipe for line exec: %s\n",
|
|
strerror(errno));
|
|
close(fids[1]);
|
|
} else switch ((pid = fork())) {
|
|
case -1:
|
|
log_Printf(LogPHASE, "Unable to fork for line exec: %s\n",
|
|
strerror(errno));
|
|
close(pidpipe[0]);
|
|
close(pidpipe[1]);
|
|
close(fids[1]);
|
|
break;
|
|
|
|
case 0:
|
|
close(pidpipe[0]);
|
|
close(fids[0]);
|
|
timer_TermService();
|
|
#ifndef NOSUID
|
|
setuid(ID0realuid());
|
|
#endif
|
|
|
|
child_status = 0;
|
|
switch ((pid = vfork())) {
|
|
case 0:
|
|
close(pidpipe[1]);
|
|
break;
|
|
|
|
case -1:
|
|
ret = errno;
|
|
log_Printf(LogPHASE, "Unable to vfork to drop parent: %s\n",
|
|
strerror(errno));
|
|
close(pidpipe[1]);
|
|
_exit(ret);
|
|
|
|
default:
|
|
write(pidpipe[1], &pid, sizeof pid);
|
|
close(pidpipe[1]);
|
|
_exit(child_status); /* The error from exec() ! */
|
|
}
|
|
|
|
log_Printf(LogDEBUG, "Exec'ing ``%s''\n", p->name.base);
|
|
|
|
if ((argc = MakeArgs(p->name.base, argv, VECSIZE(argv),
|
|
PARSE_REDUCE|PARSE_NOHASH)) < 0) {
|
|
log_Printf(LogWARN, "Syntax error in exec command\n");
|
|
_exit(ESRCH);
|
|
}
|
|
|
|
command_Expand(argv, argc, (char const *const *)argv,
|
|
p->dl->bundle, 0, realpid);
|
|
|
|
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);
|
|
|
|
execvp(*argv, argv);
|
|
child_status = errno; /* Only works for vfork() */
|
|
printf("execvp failed: %s: %s\r\n", *argv, strerror(child_status));
|
|
_exit(child_status);
|
|
break;
|
|
|
|
default:
|
|
close(pidpipe[1]);
|
|
close(fids[1]);
|
|
if (read(pidpipe[0], &p->session_owner, sizeof p->session_owner) !=
|
|
sizeof p->session_owner)
|
|
p->session_owner = (pid_t)-1;
|
|
close(pidpipe[0]);
|
|
while ((wret = waitpid(pid, &stat, 0)) == -1 && errno == EINTR)
|
|
;
|
|
if (wret == -1) {
|
|
log_Printf(LogWARN, "Waiting for child process: %s\n",
|
|
strerror(errno));
|
|
close(fids[0]);
|
|
p->session_owner = (pid_t)-1;
|
|
break;
|
|
} else if (WIFSIGNALED(stat)) {
|
|
log_Printf(LogWARN, "Child process received sig %d !\n",
|
|
WTERMSIG(stat));
|
|
close(fids[0]);
|
|
p->session_owner = (pid_t)-1;
|
|
break;
|
|
} else if (WIFSTOPPED(stat)) {
|
|
log_Printf(LogWARN, "Child process received stop sig %d !\n",
|
|
WSTOPSIG(stat));
|
|
/* I guess that's ok.... */
|
|
} else if ((ret = WEXITSTATUS(stat))) {
|
|
log_Printf(LogWARN, "Cannot exec \"%s\": %s\n", p->name.base,
|
|
strerror(ret));
|
|
close(fids[0]);
|
|
p->session_owner = (pid_t)-1;
|
|
break;
|
|
}
|
|
p->fd = fids[0];
|
|
log_Printf(LogDEBUG, "Using descriptor %d for child\n", p->fd);
|
|
physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
|
|
if (p->cfg.cd.necessity != CD_DEFAULT)
|
|
log_Printf(LogWARN, "Carrier settings ignored\n");
|
|
return &execdevice;
|
|
}
|
|
close(fids[0]);
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|