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#ifndef lint
static char *sccsid = "@(#)$Header: netaux.c,v 1.14 91/02/10 13:59:20 sob Exp $";
#endif
/*
* Routines to deal with network stuff for
* stand-alone version of server.
*/
#include "common.h"
#include <sys/socket.h>
#include <netinet/in.h>
#ifndef EXCELAN
#include <netdb.h>
#endif not EXCELAN
#include <sys/ioctl.h>
#include <signal.h>
#ifdef USG
#include <time.h>
#else not USG
#include <sys/time.h>
#endif USG
#ifdef ALONE
/*
* disassociate this process from the invoker's terminal.
* Close all file descriptors, and then open 0, 1, and 2 to
* somewhere bogus (i.e., "/", O_RDONLY). This way we will know
* that stdin/out/err will at least be claimed.
*
* Parameters: None.
*
* Returns: Nothing.
*
* Side effects: Disassociates this process from
* a terminal; closes file descriptors;
* fd 0-2 opened as O_RDONLY to /.
*/
disassoc()
{
register int i;
#ifdef USG
(void) signal(SIGTERM, SIG_IGN);
(void) signal(SIGINT, SIG_IGN);
(void) signal(SIGQUIT, SIG_IGN);
#endif
if (fork())
exit(0);
for (i = 0; i < 10; i++)
(void) close(i);
#ifdef USG
(void) open("/", 0);
(void) dup2(0, 1);
(void) dup2(0, 2);
setpgrp();
umask(000);
#else /* not USG */
i = open("/dev/tty", O_RDWR);
if (i >= 0) {
ioctl(i, TIOCNOTTY, 0);
(void) close(i);
}
i = open("/", O_RDONLY);
if (i >= 0) {
if (i != 0) { /* should never happen */
(void) dup2(i, 0);
(void) close(i);
}
(void) dup2(0, 1);
(void) dup2(1, 2);
}
#endif /* not USG */
}
/*
* get_socket -- create a socket bound to the appropriate
* port number.
*
* Parameters: None.
*
* Returns: Socket bound to correct address.
*
* Side effects: None.
*
* Errors: Syslogd, cause abortion.
*/
get_socket()
{
int s;
struct sockaddr_in sin;
#ifndef EXCELAN
struct servent *sp;
int on = 1;
sp = getservbyname("nntp", "tcp");
if (sp == NULL) {
#ifdef SYSLOG
syslog(LOG_ERR, "get_socket: tcp/nntp, unknown service.");
#endif
exit(1);
}
#endif /* not EXCELAN */
bzero((char *) &sin, sizeof (sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
#ifndef EXCELAN
sin.sin_port = sp->s_port;
s = socket(AF_INET, SOCK_STREAM, 0);
#else /* EXCELAN */
sin.sin_port = htons(IPPORT_NNTP);
s = 3; /* WTF??? */
s = socket(SOCK_STREAM, (struct sockproto *)0, &sin,
(SO_KEEPALIVE|SO_ACCEPTCONN));
#endif /* EXCELAN */
if (s < 0) {
#ifdef EXCELAN
sleep(5);
return (-1);
#else /* not EXCELAN */
#ifdef SYSLOG
syslog(LOG_ERR, "get_socket: socket: %m");
#endif /* SYSLOG */
exit(1);
#endif /* not EXCELAN */
}
#ifndef EXCELAN
#ifdef SO_REUSEADDR
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(char *) &on, sizeof (on)) < 0)
perror("setsockopt - SO_REUSEADDR");
#endif /* SO_REUSEADDR */
if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) {
#ifdef SYSLOG
syslog(LOG_ERR, "get_socket: bind: %m");
#endif
exit(1);
}
#endif /* not EXCELAN */
return (s);
}
/*
* make_stdio -- make a given socket be our standard input
* and output.
*
* Parameters: "sockt" is the socket we want to
* be file descriptors 0, 1, and 2.
*
* Returns: Nothing.
*
* Side effects: None.
*/
make_stdio(sockt)
int sockt;
{
if (sockt != 0) {
(void) dup2(sockt, 0);
(void) close(sockt);
}
(void) dup2(0, 1);
(void) dup2(1, 2);
}
/*
* set_timer -- set up the interval timer so that
* the active file is read in every so often.
*
* Parameters: None.
*
* Returns: Nothing.
*
* Side effects: Sets interval timer to READINTVL seconds.
* Sets SIGALRM to call read_again.
*/
set_timer()
{
#ifndef USG
struct itimerval new, old;
#endif /* not USG */
extern int read_again();
(void) signal(SIGALRM, read_again);
#ifdef USG
alarm(READINTVL);
#else /* not USG */
new.it_value.tv_sec = READINTVL;
new.it_value.tv_usec = 0;
new.it_interval.tv_sec = READINTVL;
new.it_interval.tv_usec = 0;
old.it_value.tv_sec = 0;
old.it_value.tv_usec = 0;
old.it_interval.tv_sec = 0;
old.it_interval.tv_usec = 0;
if (setitimer(ITIMER_REAL, &new, &old) < 0) {
#ifdef SYSLOG
syslog(LOG_ERR, "set_timer: setitimer: %m\n");
#endif SYSLOG
exit(1);
}
#endif /* not USG */
}
/*
* read_again -- (maybe) read in the active file again,
* if it's changed since the last time we checked.
*
* Parameters: None (called by interrupt).
*
* Returns: Nothing.
*
* Side effects: May change "num_groups" and "group_array".
*/
read_again()
{
static long last_mtime; /* Last time active file was changed */
struct stat statbuf;
if (stat(activefile, &statbuf) < 0)
return;
if (statbuf.st_mtime != last_mtime) {
last_mtime = statbuf.st_mtime;
num_groups = read_groups();
}
}
/*
* reaper -- reap children who are ready to die.
* Called by signal.
*
* Parameters: None.
*
* Returns: Nothing.
*
* Side effects: None.
*/
reaper()
{
#ifndef USG
union wait status;
while (wait3(&status, WNOHANG, (struct rusage *)0) > 0)
;
#endif /* not USG */
}
#else /* not ALONE */
/* Kludge for greenhill's C compiler */
static
netaux_greenkludge()
{
}
#endif /* not ALONE */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.