226 lines
6.5 KiB
C
226 lines
6.5 KiB
C
/*-
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* Copyright (c) 2015
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* Cryptonector LLC. 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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* 3. Cryptonector LLC may not be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#include <config.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifdef WIN32
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#include <io.h>
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#include <stdlib.h>
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#else
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#include <unistd.h>
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#endif
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#include "roken.h"
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#ifdef WIN32
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#define dup2 _dup2
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#endif
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static int pipefds[2] = {-1, -1};
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ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
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roken_detach_prep(int argc, char **argv, char *special_arg)
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{
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ssize_t bytes;
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size_t i;
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pid_t child;
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char **new_argv;
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char buf[1];
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char fildes[21];
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int status;
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pipefds[0] = -1;
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pipefds[1] = -1;
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#ifdef WIN32
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if (_pipe(pipefds, 4, _O_NOINHERIT | O_BINARY) == -1)
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err(1, "failed to setup to detach daemon (_pipe failed)");
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#else
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if (pipe(pipefds) == -1)
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err(1, "failed to setup to detach daemon (pipe failed)");
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#endif
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new_argv = calloc(argc + 3, sizeof(*new_argv));
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if (new_argv == NULL)
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err(1, "Out of memory");
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#ifdef WIN32
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pipefds[1] = _dup(pipefds[1]); /* The new fd will be inherited */
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if (pipefds[1] == -1)
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err(1, "Out of memory");
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#else
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fcntl(pipefds[1], F_SETFD, fcntl(pipefds[1], F_GETFD & ~(O_CLOEXEC)));
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#endif
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if (snprintf(fildes, sizeof(fildes), "%d", pipefds[1]) >= sizeof(fildes))
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err(1, "failed to setup to detach daemon (fd number %d too large)",
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pipefds[1]);
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new_argv[0] = argv[0];
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new_argv[1] = special_arg;
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new_argv[2] = fildes;
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for (i = 1; argv[i] != NULL; i++)
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new_argv[i + 2] = argv[i];
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new_argv[argc + 2] = NULL;
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#ifndef WIN32
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fflush(stdout);
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child = fork();
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#else
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{
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intptr_t child_handle;
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_flushall();
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child_handle = spawnvp(_P_NOWAIT, argv[0], new_argv);
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if (child_handle == -1)
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child = (pid_t)-1;
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else
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child = GetProcessId((HANDLE)child_handle);
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}
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#endif
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if (child == (pid_t)-1)
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err(1, "failed to setup to fork daemon (fork failed)");
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#ifndef WIN32
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if (child == 0) {
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int fd;
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(void) close(pipefds[0]);
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pipefds[0] = -1;
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/*
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* Keep stdout/stderr for now so output and errors prior to
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* detach_finish() can be seen by the user.
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*/
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fd = open(_PATH_DEVNULL, O_RDWR, 0);
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if (fd == -1)
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err(1, "failed to open /dev/null");
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(void) dup2(fd, STDIN_FILENO);
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if (fd > STDERR_FILENO)
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(void) close(fd);
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if (getenv("ROKEN_DETACH_USE_EXEC")) {
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(void) execvp(argv[0], new_argv);
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err(1, "failed to self-re-exec");
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}
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free(new_argv);
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return pipefds[1];
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}
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#endif
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/* Parent */
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free(new_argv);
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(void) close(pipefds[1]);
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pipefds[1] = -1;
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do {
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bytes = read(pipefds[0], buf, sizeof(buf));
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} while (bytes == -1 && errno == EINTR);
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(void) close(pipefds[0]);
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pipefds[0] = -1;
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if (bytes == -1) {
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/*
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* No need to wait for the process. We've killed it. If it
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* doesn't want to exit, we'd have to wait potentially forever,
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* but we want to indicate failure to the user as soon as
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* possible. A wait with timeout would end the same way
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* (attempting to kill the process).
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*/
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err(1, "failed to setup daemon child (read from child pipe)");
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}
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if (bytes == 0) {
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warnx("daemon child preparation failed, waiting for child");
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status = wait_for_process(child);
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if (SE_IS_ERROR(status) || SE_PROCSTATUS(status) != 0)
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errx(SE_PROCSTATUS(status),
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"daemon child preparation failed (child exited)");
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}
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_exit(0);
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/* NOTREACHED */
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return -1;
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}
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#ifdef WIN32
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#ifdef dup2
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#undef dup2
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#endif
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#define dup2 _dup2
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#endif
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ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
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roken_detach_finish(const char *dir, int daemon_child_fd)
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{
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char buf[1] = "";
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ssize_t bytes;
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int fd;
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rk_pidfile(NULL);
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if (pipefds[1] == -1 && daemon_child_fd != -1)
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pipefds[1] = daemon_child_fd;
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if (pipefds[0] != -1)
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(void) close(pipefds[0]);
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if (pipefds[1] == -1)
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return;
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#ifdef HAVE_SETSID
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if (setsid() == -1)
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err(1, "failed to detach from tty");
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#endif
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#ifndef WIN32
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/*
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* Hopefully we've written any pidfiles by now, if they had to be in
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* the current directory...
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*
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* The daemons do re-open logs and so on, therefore this chdir()
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* call needs to be optional for testing.
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*/
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if (dir != NULL && chdir(dir) == -1)
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err(1, "failed to chdir to /");
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#endif
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do {
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bytes = write(pipefds[1], buf, sizeof(buf));
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} while (bytes == -1 && errno == EINTR);
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if (bytes == -1)
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err(1, "failed to signal parent while detaching");
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(void) close(pipefds[1]);
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if (bytes != sizeof(buf))
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errx(1, "failed to signal parent while detaching");
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fd = open(_PATH_DEVNULL, O_RDWR, 0);
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if (fd == -1)
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err(1, "failed to open /dev/null");
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/*
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* Maybe we should check that our output got written, if redirected
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* to a file. File utils normally do this.
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*/
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(void) dup2(fd, STDOUT_FILENO);
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(void) dup2(fd, STDERR_FILENO);
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if (fd > 2)
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(void) close(fd);
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}
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