476 lines
12 KiB
C
476 lines
12 KiB
C
/*
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* Copyright (c) 1985, 1989
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)subr.c 5.24 (Berkeley) 3/2/91";
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static char rcsid[] = "$Id: subr.c,v 8.9 1997/04/25 00:27:19 vixie Exp $";
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#endif /* not lint */
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/*
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*******************************************************************************
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*
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* subr.c --
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*
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* Miscellaneous subroutines for the name server
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* lookup program.
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*
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* Copyright (c) 1985
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* Andrew Cherenson
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* U.C. Berkeley
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* CS298-26 Fall 1985
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*
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*******************************************************************************
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*/
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#include "port_before.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "port_after.h"
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#include "resolv.h"
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#include "res.h"
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/*
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*******************************************************************************
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*
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* IntrHandler --
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*
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* This routine is called whenever a control-C is typed.
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* It performs three main functions:
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* - closes an open socket connection,
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* - closes an open output file (used by LookupHost, et al.),
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* - jumps back to the main read-eval loop.
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*
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* If a user types a ^C in the middle of a routine that uses a socket,
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* the routine would not be able to close the socket. To prevent an
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* overflow of the process's open file table, the socket and output
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* file descriptors are closed by the interrupt handler.
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*
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* Side effects:
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* Open file descriptors are closed.
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* If filePtr is valid, it is closed.
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* Flow of control returns to the main() routine.
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*
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*******************************************************************************
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*/
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SIG_FN
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IntrHandler()
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{
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extern jmp_buf env;
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#if defined(BSD) && BSD >= 199006 && !defined(RISCOS_BSD) && !defined(__osf__)
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extern FILE *yyin; /* scanner input file */
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extern void yyrestart(); /* routine to restart scanner after interrupt */
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#endif
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SendRequest_close();
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ListHost_close();
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if (filePtr != NULL && filePtr != stdout) {
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fclose(filePtr);
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filePtr = NULL;
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}
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printf("\n");
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#if defined(BSD) && BSD >= 199006 && !defined(RISCOS_BSD) && !defined(__osf__)
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yyrestart(yyin);
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#endif
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longjmp(env, 1);
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}
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/*
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*******************************************************************************
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*
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* Malloc --
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* Calloc --
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*
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* Calls the malloc library routine with SIGINT blocked to prevent
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* corruption of malloc's data structures. We need to do this because
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* a control-C doesn't kill the program -- it causes a return to the
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* main command loop.
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*
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* NOTE: This method doesn't prevent the pointer returned by malloc
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* from getting lost, so it is possible to get "core leaks".
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*
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* If malloc fails, the program exits.
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*
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* Results:
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* (address) - address of new buffer.
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*
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*******************************************************************************
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*/
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char *
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Malloc(size)
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int size;
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{
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char *ptr;
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#ifdef SYSV
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#if defined(SVR3) || defined(SVR4)
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sighold(SIGINT);
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ptr = malloc((unsigned) size);
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sigrelse(SIGINT);
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#else
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{ SIG_FN (*old)();
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old = signal(SIGINT, SIG_IGN);
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ptr = malloc((unsigned) size);
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signal(SIGINT, old);
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}
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#endif
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#else
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#ifdef POSIX_SIGNALS
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{ sigset_t sset;
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sigemptyset(&sset);
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sigaddset(&sset,SIGINT);
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sigprocmask(SIG_BLOCK,&sset,NULL);
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ptr = malloc((unsigned) size);
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sigprocmask(SIG_UNBLOCK,&sset,NULL);
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}
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#else
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{ int saveMask;
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saveMask = sigblock(sigmask(SIGINT));
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ptr = malloc((unsigned) size);
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(void) sigsetmask(saveMask);
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}
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#endif
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#endif
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if (ptr == NULL) {
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fflush(stdout);
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fprintf(stderr, "*** Can't allocate memory\n");
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fflush(stderr);
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abort();
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/*NOTREACHED*/
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} else {
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return(ptr);
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}
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}
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char *
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Calloc(num, size)
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register int num, size;
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{
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char *ptr = Malloc(num*size);
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memset(ptr, 0, num*size);
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return(ptr);
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}
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/*
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*******************************************************************************
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*
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* PrintHostInfo --
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*
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* Prints out the HostInfo structure for a host.
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*
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*******************************************************************************
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*/
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void
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PrintHostInfo(file, title, hp)
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FILE *file;
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char *title;
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register HostInfo *hp;
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{
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register char **cp;
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register ServerInfo **sp;
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char comma;
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int i;
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fprintf(file, "%-7s %s", title, hp->name);
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if (hp->addrList != NULL) {
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if (hp->addrList[1] != NULL) {
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fprintf(file, "\nAddresses:");
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} else {
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fprintf(file, "\nAddress:");
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}
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comma = ' ';
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i = 0;
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for (cp = hp->addrList; cp && *cp; cp++) {
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i++;
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if (i > 4) {
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fprintf(file, "\n\t");
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comma = ' ';
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i = 0;
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}
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fprintf(file,"%c %s", comma, inet_ntoa(*(struct in_addr *)*cp));
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comma = ',';
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}
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}
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if (hp->aliases != NULL) {
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fprintf(file, "\nAliases:");
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comma = ' ';
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i = 10;
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for (cp = hp->aliases; cp && *cp && **cp; cp++) {
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i += strlen(*cp) + 2;
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if (i > 75) {
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fprintf(file, "\n\t");
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comma = ' ';
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i = 10;
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}
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fprintf(file, "%c %s", comma, *cp);
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comma = ',';
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}
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}
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if (hp->servers != NULL) {
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fprintf(file, "\nServed by:\n");
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for (sp = hp->servers; *sp != NULL ; sp++) {
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fprintf(file, "- %s\n\t", (*sp)->name);
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comma = ' ';
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i = 0;
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for (cp = (*sp)->addrList; cp && *cp && **cp; cp++) {
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i++;
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if (i > 4) {
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fprintf(file, "\n\t");
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comma = ' ';
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i = 0;
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}
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fprintf(file,
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"%c %s", comma, inet_ntoa(*(struct in_addr *)*cp));
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comma = ',';
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}
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fprintf(file, "\n\t");
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comma = ' ';
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i = 10;
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for (cp = (*sp)->domains; cp && *cp && **cp; cp++) {
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i += strlen(*cp) + 2;
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if (i > 75) {
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fprintf(file, "\n\t");
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comma = ' ';
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i = 10;
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}
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fprintf(file, "%c %s", comma, *cp);
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comma = ',';
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}
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fprintf(file, "\n");
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}
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}
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fprintf(file, "\n\n");
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}
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/*
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*******************************************************************************
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*
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* OpenFile --
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*
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* Parses a command string for a file name and opens
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* the file.
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*
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* Results:
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* file pointer - the open was successful.
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* NULL - there was an error opening the file or
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* the input string was invalid.
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*
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*******************************************************************************
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*/
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FILE *
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OpenFile(string, file)
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char *string;
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char *file;
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{
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char *redirect;
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FILE *tmpPtr;
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/*
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* Open an output file if we see '>' or >>'.
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* Check for overwrite (">") or concatenation (">>").
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*/
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redirect = strchr(string, '>');
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if (redirect == NULL) {
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return(NULL);
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}
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if (redirect[1] == '>') {
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sscanf(redirect, ">> %s", file);
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tmpPtr = fopen(file, "a+");
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} else {
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sscanf(redirect, "> %s", file);
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tmpPtr = fopen(file, "w");
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}
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if (tmpPtr != NULL) {
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redirect[0] = '\0';
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}
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return(tmpPtr);
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}
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/*
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*******************************************************************************
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*
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* DecodeError --
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*
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* Converts an error code into a character string.
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*
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*******************************************************************************
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*/
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const struct res_sym error_syms[] = {
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{ NOERROR, "Success" },
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{ FORMERR, "Format error" },
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{ SERVFAIL, "Server failed" },
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{ NXDOMAIN, "Non-existent host/domain" },
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{ NOTIMP, "Not implemented" },
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{ REFUSED, "Query refused" },
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#ifdef NOCHANGE
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{ NOCHANGE, "No change" },
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#endif
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{ TIME_OUT, "Timed out" },
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{ NO_INFO, "No information" },
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{ ERROR, "Unspecified error" },
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{ NONAUTH, "Non-authoritative answer" },
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{ NO_RESPONSE, "No response from server" },
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{ 0, NULL }
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};
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const char *
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DecodeError(result)
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int result;
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{
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const char *string;
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int success;
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string = sym_ntos(error_syms, result, &success);
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if (success)
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return string;
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return ("BAD ERROR VALUE");
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}
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int
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StringToClass(class, dflt, errorfile)
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char *class;
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int dflt;
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FILE *errorfile;
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{
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int result, success;
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result = sym_ston(__p_class_syms, class, &success);
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if (success)
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return result;
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if (errorfile)
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fprintf(errorfile, "unknown query class: %s\n", class);
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return(dflt);
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}
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/*
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*******************************************************************************
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*
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* StringToType --
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*
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* Converts a string form of a query type name to its
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* corresponding integer value.
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*
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*******************************************************************************
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*/
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int
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StringToType(type, dflt, errorfile)
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char *type;
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int dflt;
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FILE *errorfile;
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{
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int result, success;
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result = sym_ston(__p_type_syms, type, &success);
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if (success)
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return (result);
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if (errorfile)
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fprintf(errorfile, "unknown query type: %s\n", type);
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return (dflt);
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}
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/*
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*******************************************************************************
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*
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* DecodeType --
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*
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* Converts a query type to a descriptive name.
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* (A more verbose form of p_type.)
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*
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*
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*******************************************************************************
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*/
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const char *
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DecodeType(type)
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int type;
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{
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return (sym_ntop(__p_type_syms, type, (int *)0));
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}
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