/*
setup_table -- initialize the table of hosts allowed to contact the server,
by reading from the file specified by the GNU_SECURE
environment variable
Put in the local machine, and, if a security file is specifed,
add each host that is named in the file.
Return the number of hosts added.
*/
static int
setup_table (void)
{
FILE *host_file;
char *file_name;
char hostname[HOSTNAMSZ];
unsigned int host_addr;
int i, hosts=0;
/* Make sure every entry is null */
for (i=0; i<TABLE_SIZE; i++)
permitted_hosts[i] = NULL;
gethostname(hostname,HOSTNAMSZ);
if ((host_addr = internet_addr (hostname)) == (unsigned int) -1)
{
fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP",
progname,hostname);
exit(1);
} /* if */
#ifdef AUTH_MAGIC_COOKIE
server_xauth = XauGetAuthByAddr (FamilyInternet,
sizeof(host_addr), (char *)&host_addr,
strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
hosts++;
#endif /* AUTH_MAGIC_COOKIE */
#if 0 /* Don't even want to allow access from the local host by default */
add_host(host_addr); /* add local host */
#endif
if (((file_name = getenv("GNU_SECURE")) != NULL && /* security file */
(host_file = fopen(file_name,"r")) != NULL)) /* opened ok */
{
while ((fscanf(host_file,"%s",hostname) != EOF)) /* find a host */
if ((host_addr = internet_addr(hostname)) != (unsigned int) -1)
/* get its addr */
{
add_host(host_addr); /* add the addr */
hosts++;
}
fclose(host_file);
} /* if */
return hosts;
} /* setup_table */
/*
connect_to_internet_server -- establish connection with server process via
an internet domain socket. Returns socket
descriptor for server if successful.
*/
static int
connect_to_internet_server (char *serverhost, unsigned short port)
{
int s; /* connected socket descriptor */
struct servent *sp; /* pointer to service information */
struct sockaddr_in peeraddr_in; /* for peer socket address */
char buf[512]; /* temporary buffer */
int t;
/* clear out address structures */
memset((char *)&peeraddr_in,0,sizeof(struct sockaddr_in));
/* Set up the peer address to which we will connect. */
peeraddr_in.sin_family = AF_INET;
/* look up the server host's internet address */
if ((t = internet_addr(serverhost)) == -1) {
fprintf(stderr,"%s: unable to find %s in /etc/hosts or from YP\n",
progname,serverhost);
exit(1);
} else {
peeraddr_in.sin_addr.s_addr = t;
}; /* if */
if (port == 0) {
if ((sp = getservbyname ("gnuserv","tcp")) == NULL)
peeraddr_in.sin_port = htons(DEFAULT_PORT+getuid());
else
peeraddr_in.sin_port = sp->s_port;
} /* if */
else
peeraddr_in.sin_port = htons(port);
/* Create the socket. */
if ((s = socket (AF_INET,SOCK_STREAM, 0))== -1) {
perror(progname);
fprintf(stderr,"%s: unable to create socket\n",progname);
exit(1);
}; /* if */
/* Try to connect to the remote server at the address
* which was just built into peeraddr.
*/
if (connect(s, (struct sockaddr *)&peeraddr_in,
sizeof(struct sockaddr_in)) == -1) {
perror(progname);
fprintf(stderr, "%s: unable to connect to remote\n",progname);
exit(1);
}; /* if */
#ifdef AUTH_MAGIC_COOKIE
/* send credentials using MIT-MAGIC-COOKIE-1 protocol */
server_xauth =
XauGetAuthByAddr(FamilyInternet,
sizeof(peeraddr_in.sin_addr.s_addr),
(char *) &peeraddr_in.sin_addr.s_addr,
strlen(MCOOKIE_SCREEN), MCOOKIE_SCREEN,
strlen(MCOOKIE_X_NAME), MCOOKIE_X_NAME);
if (server_xauth && server_xauth->data) {
sprintf(buf, "%s\n%d\n", MCOOKIE_NAME, server_xauth->data_length);
write (s, buf, strlen(buf));
write (s, server_xauth->data, server_xauth->data_length);
return (s);
}
#endif /* AUTH_MAGIC_COOKIE */
sprintf (buf, "%s\n", DEFAUTH_NAME);
write (s, buf, strlen(buf));
return(s);
} /* connect_to_internet_server */