2 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/usr.sbin/ppp/exec.c,v 1.18.2.6 2002/09/01 02:12:26 brian Exp $
27 * $DragonFly: src/usr.sbin/ppp/exec.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
30 #include <sys/param.h>
31 #include <sys/socket.h>
51 #include "throughput.h"
57 #include "descriptor.h"
69 static struct device execdevice = {
73 { CD_NOTREQUIRED, 0 },
91 exec_iov2device(int type, struct physical *p, struct iovec *iov,
92 int *niov, int maxiov, int *auxfd, int *nauxfd)
94 if (type == EXEC_DEVICE) {
95 free(iov[(*niov)++].iov_base);
96 physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
104 exec_Create(struct physical *p)
106 if (p->fd < 0 && *p->name.full == '!') {
109 p->fd--; /* We own the device but maybe can't use it - change fd */
110 type = physical_IsSync(p) ? SOCK_DGRAM : SOCK_STREAM;
112 if (socketpair(AF_UNIX, type, PF_UNSPEC, fids) < 0)
113 log_Printf(LogPHASE, "Unable to create pipe for line exec: %s\n",
116 static int child_status; /* This variable is abused ! */
117 int stat, argc, i, ret, wret, pidpipe[2];
121 stat = fcntl(fids[0], F_GETFL, 0);
124 fcntl(fids[0], F_SETFL, stat);
127 if (pipe(pidpipe) == -1) {
128 log_Printf(LogPHASE, "Unable to pipe for line exec: %s\n",
131 } else switch ((pid = fork())) {
133 log_Printf(LogPHASE, "Unable to fork for line exec: %s\n",
145 setuid(ID0realuid());
149 switch ((pid = vfork())) {
156 log_Printf(LogPHASE, "Unable to vfork to drop parent: %s\n",
162 write(pidpipe[1], &pid, sizeof pid);
164 _exit(child_status); /* The error from exec() ! */
167 log_Printf(LogDEBUG, "Exec'ing ``%s''\n", p->name.base);
169 if ((argc = MakeArgs(p->name.base, argv, VECSIZE(argv),
170 PARSE_REDUCE|PARSE_NOHASH)) < 0) {
171 log_Printf(LogWARN, "Syntax error in exec command\n");
175 command_Expand(argv, argc, (char const *const *)argv,
176 p->dl->bundle, 0, realpid);
178 dup2(fids[1], STDIN_FILENO);
179 dup2(fids[1], STDOUT_FILENO);
180 dup2(fids[1], STDERR_FILENO);
181 for (i = getdtablesize(); i > STDERR_FILENO; i--)
182 fcntl(i, F_SETFD, 1);
185 child_status = errno; /* Only works for vfork() */
186 printf("execvp failed: %s: %s\r\n", *argv, strerror(child_status));
193 if (read(pidpipe[0], &p->session_owner, sizeof p->session_owner) !=
194 sizeof p->session_owner)
195 p->session_owner = (pid_t)-1;
197 while ((wret = waitpid(pid, &stat, 0)) == -1 && errno == EINTR)
200 log_Printf(LogWARN, "Waiting for child process: %s\n",
203 p->session_owner = (pid_t)-1;
205 } else if (WIFSIGNALED(stat)) {
206 log_Printf(LogWARN, "Child process received sig %d !\n",
209 p->session_owner = (pid_t)-1;
211 } else if (WIFSTOPPED(stat)) {
212 log_Printf(LogWARN, "Child process received stop sig %d !\n",
214 /* I guess that's ok.... */
215 } else if ((ret = WEXITSTATUS(stat))) {
216 log_Printf(LogWARN, "Cannot exec \"%s\": %s\n", p->name.base,
219 p->session_owner = (pid_t)-1;
223 log_Printf(LogDEBUG, "Using descriptor %d for child\n", p->fd);
224 physical_SetupStack(p, execdevice.name, PHYSICAL_NOFORCE);
225 if (p->cfg.cd.necessity != CD_DEFAULT)
226 log_Printf(LogWARN, "Carrier settings ignored\n");