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service.c
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/* service.c -- skeleton for Cyrus service; calls the real main
*
* Copyright (c) 2000 Carnegie Mellon University. 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.
*
* 3. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: service.c,v 1.15 2001/01/29 20:50:33 leg Exp $ */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <syslog.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdlib.h>
#include <sysexits.h>
#include "service.h"
/* number of times this service has been used */
static int use_count = 0;
static int verbose = 0;
void notify_master(int fd, int msg)
{
if (verbose) syslog(LOG_DEBUG, "telling master %d", msg);
if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) {
syslog(LOG_ERR, "unable to tell master %x: %m", msg);
}
}
#ifdef HAVE_LIBWRAP
#include <tcpd.h>
int allow_severity = LOG_DEBUG;
int deny_severity = LOG_ERR;
static void libwrap_init(struct request_info *r, char *service)
{
request_init(r, RQ_DAEMON, service, 0);
}
static int libwrap_ask(struct request_info *r, int fd)
{
int a;
struct sockaddr_in sin;
socklen_t len = sizeof(sin);
/* is this a connection from the local host? */
if (getpeername(fd, (struct sockaddr *) &sin, &len) == 0) {
if (sin.sin_family == AF_UNIX) {
return 1;
}
}
/* i hope using the sock_* functions are legal; it certainly makes
this code very easy! */
request_set(r, RQ_FILE, fd, 0);
sock_host(r);
a = hosts_access(r);
if (!a) {
syslog(deny_severity, "refused connection from %s", eval_client(r));
}
return a;
}
#else
struct request_info { int x; };
static void libwrap_init(struct request_info *r, char *service)
{
}
static int libwrap_ask(struct request_info *r, int fd)
{
return 1;
}
#endif
extern void config_init(const char *);
int main(int argc, char **argv, char **envp)
{
char name[64];
int fdflags;
int fd;
char *p = NULL;
struct request_info request;
p = getenv("CYRUS_VERBOSE");
if (p) verbose = atoi(p) + 1;
if (verbose > 30) {
syslog(LOG_DEBUG, "waiting 15 seconds for debugger");
sleep(15);
}
snprintf(name, sizeof(name) - 1, "service-%s", argv[0]);
config_init(name);
syslog(LOG_DEBUG, "executed");
/* set close on exec */
fdflags = fcntl(LISTEN_FD, F_GETFD, 0);
if (fdflags != -1) fdflags = fcntl(LISTEN_FD, F_SETFD,
fdflags | FD_CLOEXEC);
if (fdflags == -1) {
syslog(LOG_ERR, "unable to set close on exec: %m");
notify_master(STATUS_FD, MASTER_SERVICE_UNAVAILABLE);
return 1;
}
fdflags = fcntl(STATUS_FD, F_GETFD, 0);
if (fdflags != -1) fdflags = fcntl(STATUS_FD, F_SETFD,
fdflags | FD_CLOEXEC);
if (fdflags == -1) {
syslog(LOG_ERR, "unable to set close on exec: %m");
notify_master(STATUS_FD, MASTER_SERVICE_UNAVAILABLE);
return 1;
}
if (service_init(argc, argv, envp) != 0) {
notify_master(STATUS_FD, MASTER_SERVICE_UNAVAILABLE);
return 1;
}
for (;;) {
/* ok, listen to this socket until someone talks to us */
fd = -1;
while (fd < 0) { /* loop until we succeed */
/* we should probably do a select() here and time out */
fd = accept(LISTEN_FD, NULL, NULL);
if (fd < 0) {
switch (errno) {
case ENETDOWN:
#ifdef EPROTO
case EPROTO:
#endif
case ENOPROTOOPT:
case EHOSTDOWN:
#ifdef ENONET
case ENONET:
#endif
case EHOSTUNREACH:
case EOPNOTSUPP:
case ENETUNREACH:
case EAGAIN:
break;
default:
syslog(LOG_ERR, "accept failed: %m");
notify_master(STATUS_FD, MASTER_SERVICE_UNAVAILABLE);
service_abort();
exit(EX_OSERR);
}
}
}
libwrap_init(&request, argv[0]);
if (!libwrap_ask(&request, fd)) {
/* connection denied! */
close(fd);
continue;
}
syslog(LOG_DEBUG, "accepted connection");
notify_master(STATUS_FD, MASTER_SERVICE_UNAVAILABLE);
if (dup2(fd, 0) < 0) {
syslog(LOG_ERR, "can't duplicate accepted socket: %m");
service_abort();
exit(EX_OSERR);
}
if (dup2(fd, 1) < 0) {
syslog(LOG_ERR, "can't duplicate accepted socket: %m");
service_abort();
exit(EX_OSERR);
}
if (dup2(fd, 2) < 0) {
syslog(LOG_ERR, "can't duplicate accepted socket: %m");
service_abort();
exit(EX_OSERR);
}
close(fd);
use_count++;
service_main(argc, argv, envp);
/* if we returned, we can service another client with this process */
if (use_count >= MAX_USE) break;
notify_master(STATUS_FD, MASTER_SERVICE_AVAILABLE);
}
return 0;
}

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