v15i050: Updated IEN-116 namesever
Rich Salz
rsalz at uunet.uu.net
Thu Jun 9 05:44:38 AEST 1988
Submitted-by: Jerry Aguirre <jerry at oliveb.atc.olivetti.com>
Posting-number: Volume 15, Issue 50
Archive-name: ien116
[ I used an earlier version in playing with some PC networking code
at my old job. --r$ ]
This program implements the IEN 116 nameserver protocol. A driver is
provided, its first argument is the network name of the host running the
nameserver, arguments 2-n are names to request the IP address of. This
program is of use primarily for Bridge terminal servers, many of which
use this protocol in requesting machine addresses. For further
information, see the document itself.
#! /bin/sh
# This is a shell archive, meaning:
# 1. Remove everything above the #! /bin/sh line.
# 2. Save the resulting text in a file.
# 3. Execute the file with /bin/sh (not csh) to create the files:
# README
# nameserver.8
# Makefile
# ien116.h
# nameserver.c
# driver.c
export PATH; PATH=/bin:$PATH
echo shar: extracting "'README'" '(805 characters)'
if test -f 'README'
then
echo shar: will not over-write existing file "'README'"
else
sed 's/^X//' << \SHAR_EOF > 'README'
XThis program implements the IEN 116 nameserver protocol. A driver is
Xprovided, its first argument is the network name of the host running the
Xnameserver, arguments 2-n are names to request the IP address of. This
Xprogram is of use primarily for Bridge terminal servers, many of which
Xuse this protocol in requesting machine addresses. For further
Xinformation, see the document itself.
X
XTo compile, the command:
X % make
Xis sufficient. This will build the nameserver and the driver. The
Xcommand:
X % make install
Xwill install the nameserver daemon in /etc. Start it by hand initially
Xand then modify your rc.local file to run it at boot time.
X
XIt is only known that this works on a 4.3BSD Vax, but it is likely that
Xit will function on any compatable UNIX(*) machine.
X
X(*) UNIX is a trademark of AT&T.
SHAR_EOF
if test 805 -ne "`wc -c < 'README'`"
then
echo shar: error transmitting "'README'" '(should have been 805 characters)'
fi
fi # end of overwriting check
echo shar: extracting "'nameserver.8'" '(702 characters)'
if test -f 'nameserver.8'
then
echo shar: will not over-write existing file "'nameserver.8'"
else
sed 's/^X//' << \SHAR_EOF > 'nameserver.8'
X.TH nameserver 8 "Local \- June 24, 1987" "M. I. Bushnell"
X.SH NAME
Xnameserver \- process IEN 116 requests
X.SH SYNOPSIS
X.B nameserver
X.SH DESCRIPTION
X\fBNameserver\fR processes requests for network addresses using the IEN 116
Xprotocol.
X.SH SEE ALSO
XIEN 116 \- Internet Name Server (J. Postel)
X.SH DIAGNOSTICS
XVarious messages logged by syslog using LOG_CRIT and LOG_ERR.
XMainly self-explanatory. Errors such as
X.RS .5i
XError sending error \fIn\fR: ....
X.RE
Xrefer to errors in the transmission of error messages back to the requestor.
XFor explanation of the numbers, see the source.
X.SH BUGS
XWill not properly detach from the terminal if the terminal is opened on
Xany descriptor other than 0, 1, or 2.
SHAR_EOF
if test 702 -ne "`wc -c < 'nameserver.8'`"
then
echo shar: error transmitting "'nameserver.8'" '(should have been 702 characters)'
fi
fi # end of overwriting check
echo shar: extracting "'Makefile'" '(352 characters)'
if test -f 'Makefile'
then
echo shar: will not over-write existing file "'Makefile'"
else
sed 's/^X//' << \SHAR_EOF > 'Makefile'
X# Makefile for the IEN116 datagram server.
X
XCFLAGS=-O
X
Xall: nameserver driver
X
Xnameserver: nameserver.c
X $(CC) $(CFLAGS) -o nameserver nameserver.c
X
Xdriver: driver.c
X $(CC) $(CFLAGS) -o driver driver.c
X
X# installer needs write access to /etc/nameserver (root)
Xinstall: /etc/nameserver
X/etc/nameserver: nameserver
X install -c nameserver /etc/nameserver
SHAR_EOF
if test 352 -ne "`wc -c < 'Makefile'`"
then
echo shar: error transmitting "'Makefile'" '(should have been 352 characters)'
fi
fi # end of overwriting check
echo shar: extracting "'ien116.h'" '(393 characters)'
if test -f 'ien116.h'
then
echo shar: will not over-write existing file "'ien116.h'"
else
sed 's/^X//' << \SHAR_EOF > 'ien116.h'
X/* defines for the ien116 name server */
X
X#define PORT 42 /* Port for the server */
X
X/* Message types from IEN 116 */
X#define ADDR_REQ 1 /* Address Request */
X#define ADDR_ANS 2 /* Address Request Answer */
X#define ERR 3 /* Error */
X
X/* Error types from IEN 116 */
X#define UNK_ERR 0 /* Unknown Error */
X#define HOST_UNK 1 /* Host Unknown */
X#define SYNT_ERR 2 /* Syntax Error */
SHAR_EOF
if test 393 -ne "`wc -c < 'ien116.h'`"
then
echo shar: error transmitting "'ien116.h'" '(should have been 393 characters)'
fi
fi # end of overwriting check
echo shar: extracting "'nameserver.c'" '(13854 characters)'
if test -f 'nameserver.c'
then
echo shar: will not over-write existing file "'nameserver.c'"
else
sed 's/^X//' << \SHAR_EOF > 'nameserver.c'
X#ifndef lint
X static char *RCSid = "$Header: nameserver.c,v 2.3.1 88/02/26 jerry Rel $";
X#endif
X
X/* nameserver --
X Use the IEN 116 protocol to respond to nameserver requests.
X
X Modified by Jerry Aguirre. 21Mar1988
X Count in header does not include header bytes. Added a "glob"
X capability so "*" returns all host names. Removed fatal abort if no
X tty so daemon can be started from rc.local.
X
X Written by Michael I. Bushnell.
X Copyright (c) 1987 Michael I. Bushnell
X You are hereby granted permission to use this program however you wish,
X including copying and distribution. However, you are obligated not to sell
X it or any part of it. Anyone who obtains this program receives the right
X to do the same. This statement may not be removed from this program.
X*/
X
X/*
X * $Source: /u1/staff/mike/src/nameserver/RCS/nameserver.c,v $
X * $Revision: 2.3 $
X * $Date: 87/06/24 15:02:59 $
X * $State: Rel $
X * $Author: mike $
X * $Locker: $
X * $Log: nameserver.c,v $
X * Revision 2.3.1 88/02/26 Jerry Aguirre
X * Modified to work with Bridge terminal server version 1300. The field
X * size doesn't include the 2 byte header. Also added a glob capability
X * so '*' or 'xyz*' works. The '*' may not return all hosts because the
X * sendto limits the size I can send.
X *
X * Revision 2.3 87/06/24 15:02:59 mike
X * Final preparations for release. Addeed Copyright.
X *
X * Revision 2.2 87/06/24 14:54:29 mike
X * de-lintified. Lint, stupidly, doesn't pick up the definition of h_errno f
X * from libc.a. Sigh. Prepared for release.
X *
X * Revision 2.1 87/06/24 14:48:14 mike
X * Better comments.
X *
X * Revision 2.0 87/06/23 16:55:03 mike
X * Split it up into different functions.
X *
X * Revision 1.9 87/06/23 16:14:09 mike
X * Added stuff to divorce process from shell and control terminal.
X *
X * Revision 1.8 87/06/19 16:59:36 mike
X * Uses syslog instead of perror.
X * Lots of symbolic constants.
X *
X * Revision 1.7 87/06/19 14:43:49 mike
X * Fixed bug... need to initialize addrlen to sizeof(hisname).
X *
X * Revision 1.6 87/06/16 16:08:04 mike
X * Changed all "sizeof (hisaddr)" to "addrlen."
X * Still a bug...the last sendto is returning EINVAL???
X *
X * Revision 1.5 87/06/16 15:57:07 mike
X * Actually...you need to return the raw bytes. So I changed it back.
X * Also added bookoo error checking.
X *
X * Revision 1.4 87/06/15 13:50:22 mike
X * Fixed bug...need to cast the argument of inet_ntoa into a struct in_addr.
X *
X * Revision 1.3 87/06/08 14:16:56 mike
X * Uses a PORT number instead of system chosen default...now its 5001.
X *
X * Revision 1.2 87/06/08 14:10:33 mike
X * Now it compiles.
X *
X * Revision 1.1 87/06/08 13:42:20 mike
X * Initial revision
X *
X */
X
X#include <sys/file.h>
X#include <sgtty.h>
X
X#include <signal.h>
X#include <syslog.h>
X
X#include <sys/types.h>
X#include <sys/socket.h>
X#include <netinet/in.h>
X#include <netdb.h>
X
X#include <stdio.h>
X#include <ctype.h>
X
X#include "ien116.h"
X
X/* Generic constants */
X#define BUFLEN 512 /* Length of I/O buffers */
X#define RBUFLEN 1400 /* Length of glob reply buffer */
X /* note that there is a limit on size of sendto */
X#define DEF_PROTO 0 /* Use default protocol */
X#define NO_FLAGS 0 /* No flags on recvfrom/sendto */
X
X/* Message lengths */
X#define RET_MSG_LEN 6 /* Length of what we add to buf */
X#define ERR_MSG_LEN 3 /* Length of error messages */
X
Xchar buf[BUFLEN]; /* Input/Output buffer */
Xextern int errno, h_errno;
Xextern char *sys_errlist[];
X
Xint debug;
X
Xmain(argc, argv) int argc; char *argv[];
X{
X int sock; /* Datagram socket */
X struct sockaddr_in hisname; /* Address of requestor */
X int addrlen; /* Length of his address */
X struct hostent *hp, *gethostbyname(); /* Host inquired of */
X char *name; /* Name of the machine requested */
X int msglen; /* Length of the message received */
X char *nameloc();
X int arg, i;
X
X for (arg = 1; arg < argc; arg++) {
X if (argv[arg][0] == '-') {
X for (i = 1; argv[arg][i]; i++) {
X switch (argv[arg][i]) {
X case 'd':
X if (isdigit(argv[arg][i+1])) {
X debug = atoi(&argv[arg][i+1]);
X break;
X } else debug = 1;
X continue;
X
X default:
X fprintf(stderr, "nameserver: unknown option \'-%c\'.\n",
X argv[arg][i]);
X }
X break;
X }
X } else {
X fprintf(stderr, "nameserver: unexpected argument \"%s\".\n",
X argv[arg]);
X }
X }
X
X if (!debug) setupsig(); /* Set up signal handling */
X setuplog(); /* Set up the syslog connection */
X if (!debug) divorce(); /* Divorce ourselves from terminal and shell */
X sock = makesocket(); /* make and bind the socket */
X
X addrlen = sizeof(hisname);
X
X /* Main loop */
X restart:
X while (1)
X {
X /* Read a message */
X msglen = recvfrom(sock, buf, BUFLEN - RET_MSG_LEN,
X NO_FLAGS, (struct sockaddr *)&hisname, &addrlen);
X if (debug) fprintf(stderr, "nameserver: got a request\n");
X if (msglen == -1)
X {
X syslog(LOG_ERR, "Error on incoming message: %s\n",
X sys_errlist[errno]);
X if (debug) fprintf(stderr, "Error on incoming message: %s\n",
X sys_errlist[errno]);
X goto restart;
X }
X
X /* Find the name */
X name = nameloc(buf, BUFLEN, msglen, &hisname, addrlen, sock);
X if ((int) name == -1) {
X if (debug) fprintf(stderr, "nameserver: namelog() returned -1\n");
X goto restart;
X }
X
X if (isglob(name)) {
X if (debug) fprintf(stderr, "nameserver: looking up pattern \"%s\".\n",
X name);
X doglob(name, &hisname, addrlen, sock);
X goto restart;
X }
X
X if (debug) fprintf(stderr, "nameserver: looking up host \"%s\".\n",
X name);
X /* Get the host entry */
X if ((hp = gethostbyname(name))== NULL)
X {
X /* Send error message */
X buf[msglen] = ERR;
X buf[msglen+1] = ERR_MSG_LEN - 2;
X if (h_errno == HOST_NOT_FOUND ||
X h_errno == TRY_AGAIN ||
X h_errno == NO_ADDRESS)
X buf[msglen+2] = HOST_UNK;
X else
X buf[msglen+2] = UNK_ERR;
X if (sendto(sock, buf, msglen+ERR_MSG_LEN, NO_FLAGS,
X (struct sockaddr *)&hisname, addrlen)==-1)
X {
X syslog(LOG_ERR, "Error sending error 3: %s\n", sys_errlist[errno]);
X goto restart;
X }
X }
X else
X {
X /* Send the reply */
X buf[msglen] = ADDR_ANS;
X buf[msglen+1] = RET_MSG_LEN - 2;
X buf[msglen+2] = hp->h_addr_list[0][0];
X buf[msglen+3] = hp->h_addr_list[0][1];
X buf[msglen+4] = hp->h_addr_list[0][2];
X buf[msglen+5] = hp->h_addr_list[0][3];
X
X if (debug) fprintf(stderr, "nameserver: return IP %d.%d.%d.%d\n",
X hp->h_addr_list[0][0] & 0xff,
X hp->h_addr_list[0][1] & 0xff,
X hp->h_addr_list[0][2] & 0xff,
X hp->h_addr_list[0][3] & 0xff);
X
X if (sendto(sock, buf, msglen+RET_MSG_LEN, NO_FLAGS,
X (struct sockaddr *)&hisname, addrlen)==-1)
X {
X syslog(LOG_ERR, "Error sending reply: %s\n", sys_errlist[errno]);
X goto restart;
X }
X }
X }
X}
X
X
X/* setupsig -- Set all signals to be ignored. Those which cannot be ignored
X will be left at the default. */
Xsetupsig()
X{
X int i; /* Index of signals */
X
X for (i=0; i < NSIG; ++i)
X (void) signal(i, SIG_IGN);
X}
X
X
X/* setuplog -- set up the syslog connection */
Xsetuplog()
X{
X openlog("nameserver", LOG_PID | LOG_CONS, LOG_DAEMON);
X}
X
X
X/* divorce -- Divorce ourselves from the terminal and the shell */
Xdivorce()
X{
X int term; /* Terminal filed */
X
X /* First the shell */
X switch(fork())
X {
X case -1:
X syslog(LOG_CRIT, "Cannot fork: %s\n", sys_errlist[errno]);
X exit(1);
X break;
X case 0:
X break;
X default:
X exit(0);
X break;
X }
X
X /* Now the files */
X /* POTENTIAL BUG-- ASSUMES THAT THE TERMINAL IS ONLY OPEN ON FILEDS 0,1,2 */
X (void) close (0);
X (void) close (1);
X (void) close (2);
X /* Now the terminal */
X /* if started from rc.local, crontab, etc. there is no tty */
X if ((term = open("/dev/tty", O_RDWR, 0)) >= 0)
X {
X if (ioctl(term, TIOCNOTTY, (char *) 0) == -1)
X {
X syslog(LOG_CRIT, "Cannot divorce from control terminal: %s\n",
X sys_errlist[errno]);
X exit(1);
X }
X (void) close(term);
X }
X}
X
X
X/* makesocket -- return the filed of a new bound socket */
Xmakesocket()
X{
X int sock; /* Socket */
X struct sockaddr_in ourname; /* Our name */
X
X /* create the socket */
X sock = socket(AF_INET, SOCK_DGRAM, DEF_PROTO);
X if (sock < 0)
X {
X syslog(LOG_CRIT, "Error opening socket: %s\n", sys_errlist[errno]);
X exit(1);
X }
X ourname.sin_family = AF_INET;
X ourname.sin_port = htons((u_short)PORT);
X ourname.sin_addr.s_addr = INADDR_ANY;
X if (bind(sock, &ourname, sizeof(ourname)))
X
X {
X syslog(LOG_CRIT, "Error binding socket: %s\n", sys_errlist[errno]);
X exit(1);
X }
X return sock;
X}
X
X
X/* nameloc -- return the address of a null-terminated string which is the
X name to be looked up. Report syntax errors to reportto through sock.
X If an error occurs, return (char *) -1. If an error occurs, buf will be
X changed. */
Xchar *
Xnameloc(buf, buflen, msglen, reportto, addrlen, sock)
X char *buf; /* Buffer holding the request */
X int buflen, /* Length of the buffer */
X msglen, /* Length of the message in the buffer */
X sock, /* Socket for error replies */
X addrlen; /* Length of reportto */
X struct sockaddr_in *reportto; /* Who we report errors to */
X{
X char *name; /* Address of the name */
X int code; /* Type of request */
X
X buf[msglen] = '\0';
X /* Check type */
X code = buf[0];
X if (code != ADDR_REQ)
X if (code !=ADDR_ANS && code !=ERR)
X {
X /* Send error message */
X buf[0] = ERR;
X buf[1] = ERR_MSG_LEN - 2;
X buf[2] = SYNT_ERR;
X if (sendto(sock, buf, ERR_MSG_LEN, NO_FLAGS,
X (struct sockaddr *)&reportto, addrlen)==-1)
X {
X syslog(LOG_ERR, "Error sending error 0: %s\n", sys_errlist[errno]);
X return (char *) -1;
X }
X }
X else
X return (char *) -1;
X
X /* Put name at the start of a null-terminated string */
X if (buf[2]!='!')
X name=buf+2;
X else
X {
X for(name=buf+2; *name!='!'; ++name)
X if (name-buf >= buflen)
X {
X /* Send error packet */
X buf[0] = ERR;
X buf[1] = ERR_MSG_LEN - 2;
X buf[2] = SYNT_ERR;
X if (sendto(sock, buf, ERR_MSG_LEN, NO_FLAGS,
X (struct sockaddr *)&reportto, addrlen)==-1)
X {
X syslog(LOG_ERR, "Error sending error 1: %s\n",
X sys_errlist[errno]);
X return (char *) -1;
X }
X }
X for(++name; *name!='!'; ++name)
X if (name-buf >= buflen)
X {
X /* Send error packet */
X buf[0] = ERR;
X buf[1] = ERR_MSG_LEN - 2;
X buf[2] = SYNT_ERR;
X if (sendto(sock, buf, ERR_MSG_LEN, NO_FLAGS,
X (struct sockaddr *)&reportto, addrlen)==-1)
X {
X syslog(LOG_ERR, "Error sending error 2: %s\n",
X sys_errlist[errno]);
X return (char *) -1;
X }
X }
X ++name;
X }
X return name;
X}
X
Xint
Xisglob(s) char *s; /* true if string s has pattern characters */
X{
X while (*s) {
X switch (*s++) {
X case '*': return 1;
X }
X }
X return 0;
X}
X
X/* check all hosts against pattern 's'. To reduce clutter only the
X * primary host name is checked, aliases are ignored.
X */
Xdoglob(s, reportto, addrlen, sock)
X char *s; /* string containing pattern */
X struct sockaddr_in *reportto; /* Who we report errors to */
X int addrlen; /* Length of reportto */
X int sock; /* Socket for error replies */
X{
X struct hostent *hp, *gethostent();
X int i, l, n;
X char buf[RBUFLEN]; /* Output buffer */
X
X if (s[0] == '\0') { /* null pattern is illegal */
X reterror(ADDR_REQ, s, SYNT_ERR, reportto, addrlen, sock);
X return 0;
X }
X sethostent(1);
X i = 0; n = 0;
X while ((i < RBUFLEN) && (hp = gethostent())) {
X if (requ(s, hp->h_name)) { /* we found a match */
X n++;
X l = strlen(hp->h_name);
X if (l > 255) l = 255;
X if ((i + 2 + l + 2 + 4) >= RBUFLEN) break;
X buf[i++] = ADDR_REQ;
X buf[i++] = l;
X strncpy(buf+i, hp->h_name, l);
X i += l;
X buf[i++] = ADDR_ANS;
X buf[i++] = 4;
X buf[i++] = hp->h_addr_list[0][0];
X buf[i++] = hp->h_addr_list[0][1];
X buf[i++] = hp->h_addr_list[0][2];
X buf[i++] = hp->h_addr_list[0][3];
X }
X }
X endhostent();
X if (n == 0) {
X reterror(ADDR_REQ, s, HOST_UNK, reportto, addrlen, sock);
X return 1;
X }
X if (i > 0) {
X if (sendto(sock, buf, i, NO_FLAGS,
X (struct sockaddr *)reportto, addrlen)==-1) {
X syslog(LOG_ERR, "Error sending reply: %s\n", sys_errlist[errno]);
X return 0;
X }
X }
X return 1;
X}
X
Xreterror(rcode, rs, ecode, reportto, addrlen, sock)
X int rcode; /* type of request containing error */
X char *rs; /* string for above request */
X int ecode; /* error code to return */
X struct sockaddr_in *reportto; /* Who we report errors to */
X int addrlen; /* Length of reportto */
X int sock; /* Socket for error replies */
X{
X int i;
X char buf[BUFLEN]; /* Output buffer */
X
X buf[0] = rcode;
X i = strlen(rs);
X if (i > 255) i = 255;
X buf[1] = i;
X strncpy(buf+2, rs, i);
X i += 2;
X buf[i++] = ERR;
X buf[i++] = 1;
X buf[i++] = ecode;
X if (sendto(sock, buf, i, NO_FLAGS,
X (struct sockaddr *)&reportto, addrlen)==-1) {
X syslog(LOG_ERR, "Error sending error %d: %s\n",
X ecode, sys_errlist[errno]);
X return 0;
X }
X return 1;
X}
X
X/* Compare pattern 'p' to string 's'. Pattern can contain '*'
X * characters that will match 0 or more characters in string. Otherwise
X * the strings are compared on a character by character basis. Returns
X * non-zero for a match.
X */
Xint
Xrequ(p, s) register char *p, *s;
X{
X while (*p) {
X if (*p == '*') {
X do {
X if (requ(p+1, s)) return 1; /* match */
X } while (*s++);
X return 0; /* no match */
X }
X else if (*s == '\0') return 0; /* no match */
X else if (*p != *s) return 0; /* no match */
X p++; s++; /* they match so far */
X }
X if (*s) return 0; /* no match */
X return 1; /* reached end of both strings, match */
X}
SHAR_EOF
if test 13854 -ne "`wc -c < 'nameserver.c'`"
then
echo shar: error transmitting "'nameserver.c'" '(should have been 13854 characters)'
fi
fi # end of overwriting check
echo shar: extracting "'driver.c'" '(4768 characters)'
if test -f 'driver.c'
then
echo shar: will not over-write existing file "'driver.c'"
else
sed 's/^X//' << \SHAR_EOF > 'driver.c'
X#ifndef lint
X static char *RCSid = "$Header: driver.c,v 1.5.1 88/02/26 jerry Rel $";
X#endif
X
X/* driver --
X drive the IEN 116 nameserver.
X
X Modified by Jerry Aguirre. 21Mar1988
X First argument is name of server to use. Other arguments are names
X to find. More extensive display of responses.
X
X Written by Michael I. Bushnell.
X Copyright (c) 1987 Michael I. Bushnell
X You are hereby granted permission to use this program however you wish,
X including copying and distribution. However, you are obligated not to sell
X it or any part of it. Anyone who obtains this program receives the right
X to do the same. This statement may not be removed from this program.
X*/
X
X/*
X * $Source: /u1/staff/mike/src/nameserver/RCS/driver.c,v $
X * $Revision: 1.5 $
X * $Date: 87/06/24 15:02:38 $
X * $State: Rel $
X * $Author: mike $
X * $Locker: $
X * $Log: driver.c,v $
X * Revision 1.5.1 88/02/26 Jerry Aguirre <jerry at olivetti.com>
X * Field sizes don't include 2 byte header. First arg is now name
X * of server to request from. Structure of response message is displayed.
X *
X * Revision 1.5 87/06/24 15:02:38 mike
X * Prepared for final release. Added Copyright.
X *
X * Revision 1.4 87/06/19 17:00:05 mike
X * More toying around.
X *
X * Revision 1.3 87/06/19 14:44:13 mike
X * Toyed around.
X *
X * Revision 1.2 87/06/15 13:50:51 mike
X * Changed the host it asks for
X *
X * Revision 1.1 87/06/12 13:42:29 mike
X * Initial revision
X *
X */
X
X#include <sys/types.h>
X#include <sys/socket.h>
X#include <netinet/in.h>
X#include <stdio.h>
X#include <netdb.h>
X
X#include "ien116.h"
X
X#define BUFLEN 2000
Xchar buf[BUFLEN];
X
X/* Driver for the IEN 116 nameserver */
X
Xmain(argc, argv) int argc; char *argv[];
X{
X int sock; /* Datagram socket */
X struct sockaddr_in from; /* Where we got the reply from */
X struct sockaddr_in server; /* Server's address */
X struct sockaddr_in ourname; /* Our address */
X int addrlen; /* Address length */
X int c,i; /* Generic counters */
X int arg;
X struct hostent *hp, *gethostbyname(); /* Host inquired of */
X char *hostname;
X int j, k;
X int code, length;
X
X if (argc < 3) {
X printf("usage: driver server name ...");
X exit(1);
X }
X
X sock = socket(AF_INET, SOCK_DGRAM, 0);
X if (sock < 0)
X {
X perror("driver: opening socket");
X exit (1);
X }
X ourname.sin_family = AF_INET;
X ourname.sin_port = 0;
X ourname.sin_addr.s_addr = INADDR_ANY;
X if (bind(sock, (struct sockaddr *)&ourname, sizeof(ourname)))
X {
X perror("driver: binding socket");
X exit(1);
X }
X
X /* server.sin_family = AF_INET; */
X server.sin_port = htons((u_short)PORT);
X /* server.sin_addr.s_addr = INADDR_ANY; */
X server.sin_addr.s_addr = INADDR_ANY;
X hp = gethostbyname(argv[1]);
X if (hp) {
X server.sin_family = hp->h_addrtype;
X#ifndef NOT43
X bcopy(hp->h_addr_list[0], (caddr_t)&server.sin_addr,
X hp->h_length);
X#else NOT43
X bcopy(hp->h_addr, (caddr_t)&server.sin_addr,
X hp->h_length);
X#endif NOT43
X hostname = hp->h_name;
X } else {
X printf("%s: unknown host\n", argv[1]);
X exit(1);
X }
X
X for (arg = 2; arg < argc; arg++) {
X i = strlen(argv[arg]);
X buf[0] = ADDR_REQ; /* Code for request */
X buf[1] = i; /* Length of message */
X strcpy(buf+2, argv[arg]); /* name */
X
X if (sendto(sock, buf, i+2, 0, (struct sockaddr *)&server, sizeof(server))==-1)
X {
X perror("driver: sending message");
X exit(1);
X }
X
X if ((c=recvfrom(sock, buf, BUFLEN, 0, (struct sockaddr *)&from, sizeof(from)))==-1)
X {
X perror("driver: getting message");
X exit(1);
X }
X
X printf("response for \"%s\" (%d bytes):\n", argv[arg], c);
X for(i=0;(i + 1) <c;) {
X putchar('\t');
X code = buf[i++] & 0xff;
X length = buf[i++] & 0xff;
X switch (code) {
X case ADDR_REQ:
X printf("ADDR_REQ: length %d \"", length);
X for (k = 0; k < length; k++) {
X if ((buf[i+k] >= ' ') && (buf[i+k] <= '~')) putchar(buf[i+k]);
X else printf("\\%3.3o", buf[i+k] & 0xff);
X }
X printf("\"");
X break;
X case ADDR_ANS:
X printf("ADDR_ANS: length %d", length);
X for (k = 0; k < length; k++) {
X if (k == 0) printf(" %d", buf[i+k] & 0xff);
X else printf(".%d", buf[i+k] & 0xff);
X }
X break;
X case ERR:
X printf("ERR: length %d", length);
X for (k = 0; k < length; k++) {
X j = buf[i+k] & 0xff;
X printf(" error code %d", j);
X switch (j) {
X case UNK_ERR:
X printf(" UNK_ERR");
X break;
X case HOST_UNK:
X printf(" HOST_UNK");
X break;
X case SYNT_ERR:
X printf(" SYNT_ERR");
X break;
X default:
X printf("????");
X }
X }
X break;
X default:
X printf("Unknown response code 0x%x, length %d.", buf[i] & 0xff, length);
X break;
X }
X i += length;
X printf("\n");
X }
X } /* for each arg */
X}
SHAR_EOF
if test 4768 -ne "`wc -c < 'driver.c'`"
then
echo shar: error transmitting "'driver.c'" '(should have been 4768 characters)'
fi
fi # end of overwriting check
# End of shell archive
exit 0
--
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