-/******************************************************************************/
-/* pfixtools: a collection of postfix related tools */
-/* ~~~~~~~~~ */
-/* ________________________________________________________________________ */
-/* */
-/* 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. */
-/* 3. The names of its contributors may not be used to endorse or promote */
-/* products derived from this software without specific prior written */
-/* permission. */
-/* */
-/* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. */
-/******************************************************************************/
-
-/*
- * Copyright © 2007 Pierre Habouzit
- */
-
-#include <fcntl.h>
-#include <grp.h>
-#include <pwd.h>
-#include <sys/un.h>
-
-#include "common.h"
-
-static int setnonblock(int sock)
-{
- int res = fcntl(sock, F_GETFL);
-
- if (res < 0) {
- UNIXERR("fcntl");
- return -1;
- }
-
- if (fcntl(sock, F_SETFL, res | O_NONBLOCK) < 0) {
- UNIXERR("fcntl");
- return -1;
- }
-
- return 0;
-}
-
-
-int tcp_listen_nonblock(const struct sockaddr *addr, socklen_t len)
-{
- int sock;
-
- switch (addr->sa_family) {
- case AF_UNIX:
- unlink(((struct sockaddr_un *)addr)->sun_path);
- sock = socket(PF_UNIX, SOCK_STREAM, 0);
- break;
- case AF_INET:
- sock = socket(PF_INET, SOCK_STREAM, 0);
- break;
- case AF_INET6:
- sock = socket(PF_INET6, SOCK_STREAM, 0);
- break;
- default:
- errno = EINVAL;
- return -1;
- }
-
- if (sock < 0) {
- UNIXERR("socket");
- return -1;
- }
-
- if (addr->sa_family != AF_UNIX) {
- int v = 1;
- if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) < 0) {
- UNIXERR("setsockopt(SO_REUSEADDR)");
- close(sock);
- return -1;
- }
- }
-
- if (bind(sock, addr, len) < 0) {
- UNIXERR("bind");
- close(sock);
- return -1;
- }
-
- if (setnonblock(sock)) {
- close(sock);
- return -1;
- }
-
- if (listen(sock, 0) < 0) {
- UNIXERR("bind");
- close(sock);
- return -1;
- }
-
- return sock;
-}
-
-int accept_nonblock(int fd)
-{
- int sock = accept(fd, NULL, 0);
-
- if (sock < 0) {
- UNIXERR("accept");
- return -1;
- }
-
- if (setnonblock(sock)) {
- close(sock);
- return -1;
- }
-
- return sock;
-}
-
-int daemon_detach(void)
-{
- pid_t pid;
-
- close(STDIN_FILENO);
- close(STDOUT_FILENO);
- close(STDERR_FILENO);
-
- open("/dev/null", O_RDWR);
- open("/dev/null", O_RDWR);
- open("/dev/null", O_RDWR);
-
- pid = fork();
- if (pid < 0)
- return -1;
- if (pid)
- exit(0);
-
- setsid();
- return 0;
-}
-
-int drop_privileges(const char *user, const char *group)
-{
- if (!geteuid()) {
- struct passwd *pw;
- struct group *gr;
-
- if (group) {
- gr = getgrnam(group);
- if (!gr)
- return -1;
- setgid(gr->gr_gid);
- }
-
- pw = getpwnam(user);
- if (!pw)
- return -1;
- if (!group) {
- setgid(pw->pw_gid);
- }
- setuid(pw->pw_uid);
- }
-
- return 0;
-}