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/*
* The contents of this file are subject to the AOLserver Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://aolserver.com/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is AOLserver Code and related documentation
* distributed by AOL.
*
* The Initial Developer of the Original Code is America Online,
* Inc. Portions created by AOL are Copyright (C) 1999 America Online,
* Inc. All Rights Reserved.
*
* Alternatively, the contents of this file may be used under the terms
* of the GNU General Public License (the "GPL"), in which case the
* provisions of GPL are applicable instead of those above. If you wish
* to allow use of your version of this file only under the terms of the
* GPL and not to allow others to use your version of this file under the
* License, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the GPL.
* If you do not delete the provisions above, a recipient may use your
* version of this file under either the License or the GPL.
*/
/*
* listen.c --
*
* Listen for the external driver.
*/
static const char *RCSID = "@(#) $Header: /cvsroot/aolserver/aolserver/nspd/listen.c,v 1.3 2000/08/02 23:38:25 kriston Exp $, compiled: " __DATE__ " " __TIME__;
#include "pd.h"
#define DEV_NULL "/dev/null"
#ifndef WCOREDUMP
#define WCOREDUMP(s) (s & 0200)
#endif
/*
* Local functions defined in this file
*/
static void PdNewConn(int sock, int new);
static int fdNull;
/*
*==========================================================================
* API functions
*==========================================================================
*/
/*
*----------------------------------------------------------------------
*
* PdListen --
*
* Listen on a port and then handshake with the external driver
* when it connects.
*
* Results:
* None.
*
* Side effects:
* May exit on error; never returns.
*
*----------------------------------------------------------------------
*/
void
PdListen(int port)
{
int sock, new;
struct sockaddr_in sa;
int n;
fdNull = open(DEV_NULL, O_WRONLY);
if (fdNull < 0) {
Ns_FatalErrno("open");
}
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == INVALID_SOCKET) {
Ns_FatalSock("Socket");
}
memset(&sa, 0, sizeof(struct sockaddr_in));
sa.sin_family = AF_INET;
sa.sin_addr.s_addr = htonl(INADDR_ANY);
sa.sin_port = htons((unsigned short) port);
n = 1;
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n));
if (bind(sock, (struct sockaddr *) &sa, sizeof(struct sockaddr_in)) != 0) {
Ns_FatalSock("bind");
}
if (listen(sock, 5) != 0) {
Ns_FatalSock("listen");
}
if (port == 0) {
fd_set set;
struct timeval tv;
char buf[10];
n = sizeof(sa);
getsockname(sock, (struct sockaddr *) &sa, &n);
sprintf(buf, "%d", ntohs(sa.sin_port));
write(1, buf, strlen(buf) + 1);
close(1);
FD_ZERO(&set);
FD_SET(sock, &set);
tv.tv_sec = 30;
tv.tv_usec = 0;
if (select(sock + 1, &set, NULL, NULL, &tv) != 1 ||
!FD_ISSET(sock, &set)) {
Ns_FatalSock("select");
}
}
do {
new = accept(sock, NULL, 0);
if (new == INVALID_SOCKET) {
Ns_FatalSock("accept");
}
PdNewConn(sock, new);
} while (port != 0);
}
/*
*----------------------------------------------------------------------
*
* PdNewConn --
*
* Accept a new connection and run PdMainLoop on it.
*
* Results:
* None.
*
* Side effects:
* Forks and exits.
*
*----------------------------------------------------------------------
*/
static void
PdNewConn(int sock, int new)
{
int pid, status;
pid = fork();
if (pid < 0) {
Ns_FatalErrno("fork");
} else if (pid == 0) {
pid = fork();
if (pid < 0) {
Ns_FatalErrno("fork");
} else if (pid > 0) {
exit(0);
}
close(sock);
if (fdNull != 2) {
if (dup2(fdNull, 2) == -1) {
Ns_FatalErrno("dup2");
}
close(fdNull);
}
if (new != 0 && dup2(new, 0) == -1) {
Ns_FatalErrno("dup2");
}
if (new != 1 && dup2(new, 1) == -1) {
Ns_FatalErrno("dup2");
}
if (new > 2) {
close(new);
}
PdMainLoop();
Ns_PdExit(0);
} else {
close(new);
if (waitpid(pid, &status, 0) != pid) {
Ns_FatalErrno("waitpid");
} else if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
Ns_PdLog(Error, "PdNewConn: "
"child pid %d returned non-zero status: %d",
pid, WEXITSTATUS(status));
} else if (WIFSIGNALED(status)) {
Ns_PdLog(Error, "PdNewConn: child pid %d exited from signal %d%s",
pid, WTERMSIG(status),
WCOREDUMP(status) ? " - core dumped" : "");
}
}
}
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