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diff --git a/src/exec.c b/src/exec.c
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+++ b/src/exec.c
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+/*-
+ * 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: src/usr.sbin/ppp/exec.c,v 1.29.10.1.4.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#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 <sysexits.h>
+#include <sys/wait.h>
+#include <sys/stat.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 "main.h"
+#include "exec.h"
+
+
+struct execdevice {
+ struct device dev; /* What struct physical knows about */
+ int fd_out; /* output descriptor */
+};
+
+#define device2exec(d) ((d)->type == EXEC_DEVICE ? (struct execdevice *)d : NULL)
+
+unsigned
+exec_DeviceSize(void)
+{
+ return sizeof(struct execdevice);
+}
+
+static void
+exec_Free(struct physical *p)
+{
+ struct execdevice *dev = device2exec(p->handler);
+
+ if (dev->fd_out != -1)
+ close(dev->fd_out);
+ free(dev);
+}
+
+static void
+exec_device2iov(struct device *d, struct iovec *iov, int *niov,
+ int maxiov __unused, int *auxfd, int *nauxfd)
+{
+ struct execdevice *dev;
+ int sz = physical_MaxDeviceSize();
+
+ iov[*niov].iov_base = d = realloc(d, sz);
+ if (d == NULL) {
+ log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
+ AbortProgram(EX_OSERR);
+ }
+ iov[*niov].iov_len = sz;
+ (*niov)++;
+
+ dev = device2exec(d);
+ if (dev->fd_out >= 0) {
+ *auxfd = dev->fd_out;
+ (*nauxfd)++;
+ }
+}
+
+static int
+exec_RemoveFromSet(struct physical *p, fd_set *r, fd_set *w, fd_set *e)
+{
+ struct execdevice *dev = device2exec(p->handler);
+ int sets;
+
+ p->handler->removefromset = NULL;
+ sets = physical_RemoveFromSet(p, r, w, e);
+ p->handler->removefromset = exec_RemoveFromSet;
+
+ if (dev->fd_out >= 0) {
+ if (w && FD_ISSET(dev->fd_out, w)) {
+ FD_CLR(dev->fd_out, w);
+ log_Printf(LogTIMER, "%s: fdunset(w) %d\n", p->link.name, dev->fd_out);
+ sets++;
+ }
+ if (e && FD_ISSET(dev->fd_out, e)) {
+ FD_CLR(dev->fd_out, e);
+ log_Printf(LogTIMER, "%s: fdunset(e) %d\n", p->link.name, dev->fd_out);
+ sets++;
+ }
+ }
+
+ return sets;
+}
+
+static ssize_t
+exec_Write(struct physical *p, const void *v, size_t n)
+{
+ struct execdevice *dev = device2exec(p->handler);
+ int fd = dev->fd_out == -1 ? p->fd : dev->fd_out;
+
+ return write(fd, v, n);
+}
+
+static struct device baseexecdevice = {
+ EXEC_DEVICE,
+ "exec",
+ 0,
+ { CD_NOTREQUIRED, 0 },
+ NULL,
+ exec_RemoveFromSet,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ exec_Free,
+ NULL,
+ exec_Write,
+ exec_device2iov,
+ NULL,
+ NULL,
+ NULL
+};
+
+struct device *
+exec_iov2device(int type, struct physical *p, struct iovec *iov,
+ int *niov, int maxiov __unused, int *auxfd, int *nauxfd)
+{
+ if (type == EXEC_DEVICE) {
+ struct execdevice *dev = (struct execdevice *)iov[(*niov)++].iov_base;
+
+ dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */
+ if (dev == NULL) {
+ log_Printf(LogALERT, "Failed to allocate memory: %d\n",
+ (int)(sizeof *dev));
+ AbortProgram(EX_OSERR);
+ }
+
+ if (*nauxfd) {
+ dev->fd_out = *auxfd;
+ (*nauxfd)--;
+ } else
+ dev->fd_out = -1;
+
+ /* Refresh function pointers etc */
+ memcpy(&dev->dev, &baseexecdevice, sizeof dev->dev);
+
+ physical_SetupStack(p, dev->dev.name, PHYSICAL_NOFORCE);
+ return &dev->dev;
+ }
+
+ return NULL;
+}
+
+static int
+exec_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
+{
+ struct physical *p = descriptor2physical(d);
+ struct execdevice *dev = device2exec(p->handler);
+ int result = 0;
+
+ if (w && dev->fd_out >= 0) {
+ FD_SET(dev->fd_out, w);
+ log_Printf(LogTIMER, "%s: fdset(w) %d\n", p->link.name, dev->fd_out);
+ result++;
+ w = NULL;
+ }
+
+ if (e && dev->fd_out >= 0) {
+ FD_SET(dev->fd_out, e);
+ log_Printf(LogTIMER, "%s: fdset(e) %d\n", p->link.name, dev->fd_out);
+ result++;
+ }
+
+ if (result && *n <= dev->fd_out)
+ *n = dev->fd_out + 1;
+
+ return result + physical_doUpdateSet(d, r, w, e, n, 0);
+}
+
+static int
+exec_IsSet(struct fdescriptor *d, const fd_set *fdset)
+{
+ struct physical *p = descriptor2physical(d);
+ struct execdevice *dev = device2exec(p->handler);
+ int result = dev->fd_out >= 0 && FD_ISSET(dev->fd_out, fdset);
+ result += physical_IsSet(d, fdset);
+
+ return result;
+}
+
+struct device *
+exec_Create(struct physical *p)
+{
+ struct execdevice *dev;
+
+ dev = NULL;
+ if (p->fd < 0) {
+ if (*p->name.full == '!') {
+ int fids[2], type;
+
+ if ((dev = malloc(sizeof *dev)) == NULL) {
+ log_Printf(LogWARN, "%s: Cannot allocate an exec device: %s\n",
+ p->link.name, strerror(errno));
+ return NULL;
+ }
+ dev->fd_out = -1;
+
+ 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));
+ free(dev);
+ dev = NULL;
+ } 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]);
+ close(fids[0]);
+ free(dev);
+ dev = NULL;
+ } 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]);
+ close(fids[0]);
+ 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);
+ }
+ }
+ }
+ } else {
+ struct stat st;
+
+ if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFIFO)) {
+ if ((dev = malloc(sizeof *dev)) == NULL)
+ log_Printf(LogWARN, "%s: Cannot allocate an exec device: %s\n",
+ p->link.name, strerror(errno));
+ else if (p->fd == STDIN_FILENO) {
+ log_Printf(LogPHASE, "%s: Using stdin/stdout to communicate with "
+ "parent (pipe mode)\n", p->link.name);
+ dev->fd_out = dup(STDOUT_FILENO);
+
+ /* Hook things up so that we monitor dev->fd_out */
+ p->desc.UpdateSet = exec_UpdateSet;
+ p->desc.IsSet = exec_IsSet;
+ } else
+ dev->fd_out = -1;
+ }
+ }
+
+ if (dev) {
+ memcpy(&dev->dev, &baseexecdevice, sizeof dev->dev);
+ physical_SetupStack(p, dev->dev.name, PHYSICAL_NOFORCE);
+ if (p->cfg.cd.necessity != CD_DEFAULT)
+ log_Printf(LogWARN, "Carrier settings ignored\n");
+ return &dev->dev;
+ }
+
+ return NULL;
+}
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