229 lines
6.8 KiB
C
229 lines
6.8 KiB
C
/*-
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* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/wait.h>
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#include <sys/uio.h>
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#include <termios.h>
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#include <unistd.h>
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#include "layer.h"
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#include "defs.h"
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#include "mbuf.h"
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#include "log.h"
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#include "timer.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "throughput.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "async.h"
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#include "descriptor.h"
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#include "physical.h"
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#include "mp.h"
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#include "chat.h"
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#include "command.h"
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#include "auth.h"
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#include "chap.h"
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#include "cbcp.h"
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#include "datalink.h"
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#include "id.h"
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#include "exec.h"
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static struct device execdevice = {
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EXEC_DEVICE,
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"exec",
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{ CD_NOTREQUIRED, 0 },
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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};
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struct device *
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exec_iov2device(int type, struct physical *p, struct iovec *iov,
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int *niov, int maxiov, int *auxfd, int *nauxfd)
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{
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if (type == EXEC_DEVICE) {
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free(iov[(*niov)++].iov_base);
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physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
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return &execdevice;
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}
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return NULL;
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}
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struct device *
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exec_Create(struct physical *p)
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{
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if (p->fd < 0 && *p->name.full == '!') {
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int fids[2], type;
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p->fd--; /* We own the device but maybe can't use it - change fd */
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type = physical_IsSync(p) ? SOCK_DGRAM : SOCK_STREAM;
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if (socketpair(AF_UNIX, type, PF_UNSPEC, fids) < 0)
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log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n",
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strerror(errno));
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else {
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static int child_status; /* This variable is abused ! */
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int stat, argc, i, ret, wret, pidpipe[2];
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pid_t pid, realpid;
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char *argv[MAXARGS];
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stat = fcntl(fids[0], F_GETFL, 0);
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if (stat > 0) {
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stat |= O_NONBLOCK;
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fcntl(fids[0], F_SETFL, stat);
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}
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realpid = getpid();
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if (pipe(pidpipe) == -1) {
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log_Printf(LogPHASE, "Unable to pipe for line exec: %s\n",
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strerror(errno));
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close(fids[1]);
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} else switch ((pid = fork())) {
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case -1:
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log_Printf(LogPHASE, "Unable to fork for line exec: %s\n",
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strerror(errno));
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close(pidpipe[0]);
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close(pidpipe[1]);
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close(fids[1]);
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break;
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case 0:
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close(pidpipe[0]);
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close(fids[0]);
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timer_TermService();
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setuid(ID0realuid());
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child_status = 0;
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switch ((pid = vfork())) {
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case 0:
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close(pidpipe[1]);
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break;
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case -1:
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ret = errno;
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log_Printf(LogPHASE, "Unable to vfork to drop parent: %s\n",
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strerror(errno));
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close(pidpipe[1]);
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_exit(ret);
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default:
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write(pidpipe[1], &pid, sizeof pid);
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close(pidpipe[1]);
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_exit(child_status); /* The error from exec() ! */
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}
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log_Printf(LogDEBUG, "Exec'ing ``%s''\n", p->name.base);
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if ((argc = MakeArgs(p->name.base, argv, VECSIZE(argv),
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PARSE_REDUCE|PARSE_NOHASH)) < 0) {
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log_Printf(LogWARN, "Syntax error in exec command\n");
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_exit(ESRCH);
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}
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command_Expand(argv, argc, (char const *const *)argv,
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p->dl->bundle, 0, realpid);
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dup2(fids[1], STDIN_FILENO);
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dup2(fids[1], STDOUT_FILENO);
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dup2(fids[1], STDERR_FILENO);
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for (i = getdtablesize(); i > STDERR_FILENO; i--)
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fcntl(i, F_SETFD, 1);
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execvp(*argv, argv);
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child_status = errno; /* Only works for vfork() */
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printf("execvp failed: %s: %s\r\n", *argv, strerror(child_status));
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_exit(child_status);
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break;
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default:
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close(pidpipe[1]);
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close(fids[1]);
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if (read(pidpipe[0], &p->session_owner, sizeof p->session_owner) !=
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sizeof p->session_owner)
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p->session_owner = (pid_t)-1;
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close(pidpipe[0]);
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while ((wret = waitpid(pid, &stat, 0)) == -1 && errno == EINTR)
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;
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if (wret == -1) {
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log_Printf(LogWARN, "Waiting for child process: %s\n",
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strerror(errno));
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close(fids[0]);
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p->session_owner = (pid_t)-1;
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break;
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} else if (WIFSIGNALED(stat)) {
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log_Printf(LogWARN, "Child process received sig %d !\n",
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WTERMSIG(stat));
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close(fids[0]);
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p->session_owner = (pid_t)-1;
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break;
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} else if (WIFSTOPPED(stat)) {
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log_Printf(LogWARN, "Child process received stop sig %d !\n",
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WSTOPSIG(stat));
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/* I guess that's ok.... */
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} else if ((ret = WEXITSTATUS(stat))) {
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log_Printf(LogWARN, "Cannot exec \"%s\": %s\n", p->name.base,
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strerror(ret));
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close(fids[0]);
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p->session_owner = (pid_t)-1;
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break;
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}
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p->fd = fids[0];
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log_Printf(LogDEBUG, "Using descriptor %d for child\n", p->fd);
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physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
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if (p->cfg.cd.necessity != CD_DEFAULT)
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log_Printf(LogWARN, "Carrier settings ignored\n");
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return &execdevice;
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}
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close(fids[0]);
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}
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}
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return NULL;
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}
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