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deb-mbse/lib/client.c
2003-07-07 19:20:51 +00:00

215 lines
5.3 KiB
C

/*****************************************************************************
*
* $Id$
* Purpose ...............: MBSE Deamon Client
*
*****************************************************************************
* Copyright (C) 1993-2003
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* MBSE BBS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MB BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*****************************************************************************/
#include "../config.h"
#include "libs.h"
#include "memwatch.h"
#include "clcomm.h"
static int sock = -1; /* Unix Datagram socket */
struct sockaddr_un clntaddr; /* Client socket address */
struct sockaddr_un servaddr; /* Server socket address */
struct sockaddr_un from; /* From socket address */
int fromlen;
static char *myname='\0'; /* my program name */
char spath[108]; /* Server socket path */
char cpath[108]; /* Client socket path */
/************************************************************************
*
* Connect to Unix Datagram socket, return -1 if error or socket no.
*/
int socket_connect(char *user, char *prg, char *city)
{
int s;
static char buf[SS_BUFSIZE];
char tty[18];
myname = prg;
/*
* Create Unix Datagram socket for the client.
*/
s = socket(AF_UNIX, SOCK_DGRAM, 0);
if (s == -1) {
perror(myname);
printf("Unable to create Unix Datagram socket\n");
return -1;
}
/*
* Client will bind to an address so the server will get
* an address in its recvfrom call and use it to send
* data back to the client.
*/
memset(&clntaddr, 0, sizeof(clntaddr));
clntaddr.sun_family = AF_UNIX;
strcpy(clntaddr.sun_path, cpath);
if (bind(s, (struct sockaddr *)&clntaddr, sizeof(clntaddr)) < 0) {
close(s);
perror(myname);
printf("Can't bind socket %s\n", cpath);
return -1;
}
/*
* If running seteuid as another user, chown to mbse.bbs
*/
if (getuid() != geteuid()) {
chown(cpath, getuid(), getgid());
} else {
chmod(cpath, 0775);
}
/*
* Setup address structure for the server socket.
*/
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sun_family = AF_UNIX;
strcpy(servaddr.sun_path, spath);
/*
* Now that we have an connection, we gather
* information to tell the server who we are.
*/
if (isatty(1) && (ttyname(1) != NULL)) {
strcpy(tty, ttyname(1));
if (strchr(tty, 'p'))
strcpy(tty, index(tty, 'p'));
else if (strchr(tty, 't'))
strcpy(tty, index(tty, 't'));
else if (strchr(tty, 'c'))
strcpy(tty, index(tty, 'c'));
} else {
strcpy(tty, "-");
}
sock = s;
/*
* Send the information to the server.
*/
sprintf(buf, "AINI:5,%d,%s,%s,%s,%s;", getpid(), tty, user, prg, city);
if (socket_send(buf) != 0) {
sock = -1;
return -1;
}
strcpy(buf, socket_receive());
if (strncmp(buf, "100:0;", 6) != 0) {
printf("AINI not acknowledged by the server\n");
sock = -1;
return -1;
}
return s;
}
/*
* Send data via internet domain socket
*/
int socket_send(char *buf)
{
if (sock == -1)
return -1;
if (sendto(sock, buf, strlen(buf), 0, (struct sockaddr *)&servaddr, sizeof(servaddr)) != strlen(buf)) {
printf("Socket send failed error %d\n", errno);
return -1;
}
return 0;
}
/*
* Return an empty buffer if somthing went wrong, else the complete
* dataline is returned.
*/
char *socket_receive(void)
{
static char buf[SS_BUFSIZE];
int rlen;
memset((char *)&buf, 0, SS_BUFSIZE);
fromlen = sizeof(from);
rlen = recvfrom(sock, buf, SS_BUFSIZE, 0, (struct sockaddr *)&from, &fromlen);
if (rlen == -1) {
perror("recv");
printf("Error reading socket\n");
memset((char *)&buf, 0, SS_BUFSIZE);
return buf;
}
return buf;
}
/***************************************************************************
*
* Shutdown the socket, first send the server the close command so this
* application will be removed from the servers active clients list.
* There must be a parameter with the pid so that client applications
* where the shutdown will be done by a child process is able to give
* the parent pid as an identifier.
*/
int socket_shutdown(pid_t pid)
{
static char buf[SS_BUFSIZE];
if (sock == -1)
return 0;
sprintf(buf, "ACLO:1,%d;", pid);
if (socket_send(buf) == 0) {
strcpy(buf, socket_receive());
if (strncmp(buf, "107:0;", 6) != 0) {
printf("Shutdown not acknowledged by the server\n");
printf("Got \"%s\"\n", buf);
}
}
if (shutdown(sock, 1) == -1) {
perror(myname);
printf("Cannot shutdown socket\n");
return -1;
}
sock = -1;
return 0;
}