1375 lines
30 KiB
C
1375 lines
30 KiB
C
/*
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* Copyright (c) 1986 Regents of the University of California
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* All Rights Reserved
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that this notice is preserved and that due credit is given
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* to the University of California at Berkeley. The name of the University
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* may not be used to endorse or promote products derived from this
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* software without specific prior written permission. This software
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* is provided ``as is'' without express or implied warranty.
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*/
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/*
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* Actually, this program is from Rutgers University, however it is
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* based on nslookup and other pieces of named tools, so it needs
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* that copyright notice.
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <arpa/nameser.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <resolv.h>
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#include <sys/param.h>
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#include <strings.h>
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#include <ctype.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/ioc_net.h>
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#include <net/netlib.h>
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#include <net/gen/in.h>
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#include <net/gen/tcp.h>
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#include <net/gen/tcp_io.h>
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extern int h_errno;
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#define NUMMX 50
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#define SUCCESS 0
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#define TIME_OUT -1
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#define NO_INFO -2
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#define ERROR -3
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#define NONAUTH -4
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#define NAME_LEN 256
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#ifndef T_TXT
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#define T_TXT 16
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#endif
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#ifndef NO_DATA
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#define NO_DATA NO_ADDRESS
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#endif
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#ifndef C_HS
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#define C_HS 4
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#endif
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#ifndef NOCHANGE
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#define NOCHANGE 0xf
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#endif
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FILE *filePtr;
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static struct __res_state orig;
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static u8_t *cname = NULL;
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int getclass = C_IN;
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int gettype, getdeftype = T_A;
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int verbose = 0;
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int list = 0;
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int server_specified = 0;
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union querybuf;
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int main( int c, char *v[] );
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static int parsetype( char *s );
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static int parseclass( char *s );
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static void hperror( int err_no );
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static void printanswer( struct hostent *hp );
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static int ListHosts( char *namePtr, int queryType );
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static int gethostinfo( char *name );
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static int getdomaininfo( char *name, char *domain );
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static int getinfo( char *name, char *domain, int type );
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static int printinfo( union querybuf *answer, u8_t *eom, int filter, int
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isls );
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static char *DecodeError( int result );
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static u8_t *pr_rr( u8_t *cp, u8_t *msg, FILE *file, int filter );
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static u8_t * pr_cdname( u8_t *cp, u8_t *msg, u8_t *name, int namelen );
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static char *pr_class( int class );
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static char *pr_type( int type );
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static int tcpip_writeall( int fd, char *buf, unsigned siz );
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int
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main(c, v)
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int c;
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char **v;
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{
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char *domain;
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struct in_addr addr;
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register struct hostent *hp;
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register char *s, *p;
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register int inverse = 0;
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register int waitmode = 0;
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u8_t *oldcname;
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int ncnames;
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int isaddr;
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res_init();
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_res.retrans = 5;
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if (c < 2) {
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fprintf(stderr, "Usage: host [-w] [-v] [-r] [-d] [-V] [-t querytype] [-c class] [-a] host [server]\n -w to wait forever until reply\n -v for verbose output\n -r to disable recursive processing\n -d to turn on debugging output\n -t querytype to look for a specific type of information\n -c class to look for non-Internet data\n -a is equivalent to '-v -t *'\n -V to always use a virtual circuit\n");
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exit(1);
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}
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while (c > 2 && v[1][0] == '-') {
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if (strcmp (v[1], "-w") == 0) {
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_res.retry = 1;
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_res.retrans = 15;
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waitmode = 1;
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v++;
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c--;
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}
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else if (strcmp (v[1], "-r") == 0) {
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_res.options &= ~RES_RECURSE;
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v++;
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c--;
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}
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else if (strcmp (v[1], "-d") == 0) {
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_res.options |= RES_DEBUG;
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v++;
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c--;
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}
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else if (strcmp (v[1], "-v") == 0) {
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verbose = 1;
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v++;
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c--;
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}
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else if (strcmp (v[1], "-l") == 0) {
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list = 1;
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v++;
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c--;
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}
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else if (strncmp (v[1], "-t", 2) == 0) {
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v++;
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c--;
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gettype = parsetype(v[1]);
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v++;
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c--;
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}
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else if (strncmp (v[1], "-c", 2) == 0) {
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v++;
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c--;
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getclass = parseclass(v[1]);
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v++;
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c--;
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}
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else if (strcmp (v[1], "-a") == 0) {
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verbose = 1;
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gettype = T_ANY;
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v++;
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c--;
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}
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else if (strcmp (v[1], "-V") == 0) {
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_res.options |= RES_USEVC;
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v++;
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c--;
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}
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}
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if (c > 2) {
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s = v[2];
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server_specified++;
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if ((p = strchr(s, ':')) != NULL) *p++ = 0;
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isaddr = inet_aton(s, &addr);
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if (p != NULL) p[-1] = ':';
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if (!isaddr) {
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hp = gethostbyname(s);
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if (hp == NULL) {
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fprintf(stderr,"Error in looking up server name:\n");
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hperror(h_errno);
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exit(1);
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}
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memcpy(&_res.nsaddr.sin_addr, hp->h_addr, NS_INADDRSZ);
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printf("Using domain server:\n");
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printanswer(hp);
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}
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else {
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_res.nsaddr.sin_family = AF_INET;
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_res.nsaddr.sin_addr = addr;
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_res.nsaddr.sin_port = htons(NAMESERVER_PORT);
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printf("Using domain server %s:\n",
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inet_ntoa(_res.nsaddr.sin_addr));
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}
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}
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domain = v[1];
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if (strcmp (domain, ".") != 0 && inet_aton(domain, &addr)) {
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static char ipname[sizeof("255.255.255.255.in-addr.arpa.")];
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sprintf(ipname, "%d.%d.%d.%d.in-addr.arpa.",
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((unsigned char *) &addr)[3],
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((unsigned char *) &addr)[2],
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((unsigned char *) &addr)[1],
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((unsigned char *) &addr)[0]);
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domain = ipname;
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getdeftype = T_PTR;
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}
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hp = NULL;
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h_errno = TRY_AGAIN;
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/*
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* we handle default domains ourselves, thank you
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*/
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_res.options &= ~RES_DEFNAMES;
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if (list)
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exit(ListHosts(domain, gettype ? gettype : getdeftype));
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oldcname = NULL;
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ncnames = 5;
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while (hp == NULL && h_errno == TRY_AGAIN) {
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cname = NULL;
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if (oldcname == NULL)
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hp = (struct hostent *)gethostinfo(domain);
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else
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hp = (struct hostent *)gethostinfo((char *)oldcname);
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if (cname) {
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if (ncnames-- == 0) {
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printf("Too many cnames. Possible loop.\n");
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exit(1);
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}
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oldcname = cname;
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hp = NULL;
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h_errno = TRY_AGAIN;
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continue;
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}
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if (!waitmode)
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break;
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}
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if (hp == NULL) {
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hperror(h_errno);
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exit(1);
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}
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exit(0);
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}
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static int
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parsetype(s)
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char *s;
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{
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if (strcmp(s,"a") == 0)
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return(1);
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if (strcmp(s,"ns") == 0)
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return(2);
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if (strcmp(s,"md") == 0)
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return(3);
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if (strcmp(s,"mf") == 0)
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return(4);
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if (strcmp(s,"cname") == 0)
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return(5);
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if (strcmp(s,"soa") == 0)
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return(6);
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if (strcmp(s,"mb") == 0)
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return(7);
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if (strcmp(s,"mg") == 0)
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return(8);
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if (strcmp(s,"mr") == 0)
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return(9);
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if (strcmp(s,"null") == 0)
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return(10);
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if (strcmp(s,"wks") == 0)
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return(11);
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if (strcmp(s,"ptr") == 0)
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return(12);
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if (strcmp(s,"hinfo") == 0)
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return(13);
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if (strcmp(s,"minfo") == 0)
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return(14);
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if (strcmp(s,"mx") == 0)
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return(15);
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if (strcmp(s,"txt") == 0) /* Roy */
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return(T_TXT); /* Roy */
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if (strcmp(s,"uinfo") == 0)
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return(100);
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if (strcmp(s,"uid") == 0)
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return(101);
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if (strcmp(s,"gid") == 0)
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return(102);
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if (strcmp(s,"unspec") == 0)
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return(103);
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if (strcmp(s,"any") == 0)
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return(255);
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if (strcmp(s,"*") == 0)
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return(255);
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if (atoi(s))
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return(atoi(s));
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fprintf(stderr, "Invalid query type: %s\n", s);
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exit(2);
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}
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static int
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parseclass(s)
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char *s;
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{
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if (strcmp(s,"in") == 0)
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return(C_IN);
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if (strcmp(s,"chaos") == 0)
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return(C_CHAOS);
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if (strcmp(s,"hs") == 0)
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return(C_HS);
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if (strcmp(s,"any") == 0)
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return(C_ANY);
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if (atoi(s))
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return(atoi(s));
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fprintf(stderr, "Invalid query class: %s\n", s);
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exit(2);
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}
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static void
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printanswer(hp)
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register struct hostent *hp;
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{
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register char **cp;
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struct in_addr **hptr;
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printf("Name: %s\n", hp->h_name);
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printf("Address:");
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for (hptr = (struct in_addr **)hp->h_addr_list; *hptr; hptr++)
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printf(" %s", inet_ntoa(**hptr));
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printf("\nAliases:");
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for (cp = hp->h_aliases; cp && *cp && **cp; cp++)
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printf(" %s", *cp);
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printf("\n\n");
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}
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||
|
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static void
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hperror(err_no)
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int err_no;
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{
|
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switch(err_no) {
|
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case HOST_NOT_FOUND:
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fprintf(stderr,"Host not found.\n");
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break;
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||
case TRY_AGAIN:
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fprintf(stderr,"Host not found, try again.\n");
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break;
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case NO_RECOVERY:
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fprintf(stderr,"No recovery, Host not found.\n");
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break;
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||
case NO_ADDRESS:
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fprintf(stderr,"There is an entry for this host, but it doesn't have what you requested.\n");
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||
break;
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||
}
|
||
}
|
||
|
||
typedef union querybuf {
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HEADER qb1;
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u8_t qb2[PACKETSZ];
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} querybuf_t;
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||
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||
static u8_t hostbuf[BUFSIZ+1];
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||
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static int
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gethostinfo(name)
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char *name;
|
||
{
|
||
register char *cp, **domain;
|
||
int n;
|
||
int hp;
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||
int nDomain;
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if (strcmp(name, ".") == 0)
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return(getdomaininfo(name, NULL));
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for (cp = name, n = 0; *cp; cp++)
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if (*cp == '.')
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n++;
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if (n && cp[-1] == '.') {
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if (cp[-1] == '.')
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cp[-1] = 0;
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hp = getdomaininfo(name, (char *)NULL);
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if (cp[-1] == 0)
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cp[-1] = '.';
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return (hp);
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}
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||
if (n == 0 && (cp = __hostalias(name))) {
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||
if (verbose)
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printf("Aliased to \"%s\"\n", cp);
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_res.options |= RES_DEFNAMES;
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||
return (getdomaininfo(cp, (char *)NULL));
|
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}
|
||
#ifdef MAXDS
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||
for (nDomain = 0;
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_res.defdname_list[nDomain][0] != 0;
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nDomain++) {
|
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for (domain = _res.dnsrch_list[nDomain]; *domain; domain++) {
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if (verbose)
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printf("Trying domain \"%s\"\n", *domain);
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hp = getdomaininfo(name, *domain);
|
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if (hp)
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return (hp);
|
||
}
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||
}
|
||
#else
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for (domain = _res.dnsrch; *domain; domain++) {
|
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if (verbose)
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printf("Trying domain \"%s\"\n", *domain);
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||
hp = getdomaininfo(name, *domain);
|
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if (hp)
|
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return (hp);
|
||
}
|
||
#endif
|
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if (h_errno != HOST_NOT_FOUND ||
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||
(_res.options & RES_DNSRCH) == 0)
|
||
return (0);
|
||
if (verbose)
|
||
printf("Trying null domain\n");
|
||
return (getdomaininfo(name, (char *)NULL));
|
||
}
|
||
|
||
static int
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||
getdomaininfo(name, domain)
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||
char *name, *domain;
|
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{
|
||
return getinfo(name, domain, gettype ? gettype : getdeftype);
|
||
}
|
||
|
||
static int
|
||
getinfo(name, domain, type)
|
||
char *name, *domain;
|
||
{
|
||
|
||
HEADER *hp;
|
||
u8_t *eom, *bp, *cp;
|
||
querybuf_t buf, answer;
|
||
int n, n1, i, j, nmx, ancount, nscount, arcount, qdcount, buflen;
|
||
char host[2*MAXDNAME+2];
|
||
|
||
if (domain == NULL)
|
||
(void)sprintf(host, "%.*s", MAXDNAME, name);
|
||
else
|
||
(void)sprintf(host, "%.*s.%.*s", MAXDNAME, name, MAXDNAME, domain);
|
||
|
||
n = res_mkquery(QUERY, host, getclass, type, (char *)NULL, 0, NULL,
|
||
(char *)&buf, sizeof(buf));
|
||
if (n < 0) {
|
||
if (_res.options & RES_DEBUG)
|
||
printf("res_mkquery failed\n");
|
||
h_errno = NO_RECOVERY;
|
||
return(0);
|
||
}
|
||
n = res_send((char *)&buf, n, (char *)&answer, sizeof(answer));
|
||
if (n < 0) {
|
||
if (_res.options & RES_DEBUG)
|
||
printf("res_send failed\n");
|
||
h_errno = TRY_AGAIN;
|
||
return (0);
|
||
}
|
||
eom = (u8_t *)&answer + n;
|
||
return(printinfo(&answer, eom, T_ANY, 0));
|
||
}
|
||
|
||
static int
|
||
printinfo(answer, eom, filter, isls)
|
||
querybuf_t *answer;
|
||
u8_t *eom;
|
||
int filter;
|
||
int isls;
|
||
{
|
||
HEADER *hp;
|
||
u8_t *bp, *cp;
|
||
int nmx, ancount, nscount, arcount, qdcount, buflen;
|
||
|
||
/*
|
||
* find first satisfactory answer
|
||
*/
|
||
hp = (HEADER *) answer;
|
||
ancount = ntohs(hp->ancount);
|
||
qdcount = ntohs(hp->qdcount);
|
||
nscount = ntohs(hp->nscount);
|
||
arcount = ntohs(hp->arcount);
|
||
if (_res.options & RES_DEBUG || (verbose && isls == 0))
|
||
printf("rcode = %d (%s), ancount=%d\n",
|
||
hp->rcode,
|
||
DecodeError(hp->rcode),
|
||
ancount);
|
||
if (hp->rcode != NOERROR || (ancount+nscount+arcount) == 0) {
|
||
switch (hp->rcode) {
|
||
case NXDOMAIN:
|
||
/* Check if it's an authoritive answer */
|
||
if (hp->aa) {
|
||
h_errno = HOST_NOT_FOUND;
|
||
return(0);
|
||
} else {
|
||
h_errno = TRY_AGAIN;
|
||
return(0);
|
||
}
|
||
case SERVFAIL:
|
||
h_errno = TRY_AGAIN;
|
||
return(0);
|
||
#ifdef OLDJEEVES
|
||
/*
|
||
* Jeeves (TOPS-20 server) still does not
|
||
* support MX records. For the time being,
|
||
* we must accept FORMERRs as the same as
|
||
* NOERROR.
|
||
*/
|
||
case FORMERR:
|
||
#endif /* OLDJEEVES */
|
||
case NOERROR:
|
||
/* TpB - set a return error for this case. NO_DATA */
|
||
h_errno = NO_DATA;
|
||
return(0); /* was 1,but now indicates exception */
|
||
#ifndef OLDJEEVES
|
||
case FORMERR:
|
||
#endif /* OLDJEEVES */
|
||
case NOTIMP:
|
||
case REFUSED:
|
||
h_errno = NO_RECOVERY;
|
||
return(0);
|
||
}
|
||
return (0);
|
||
}
|
||
bp = hostbuf;
|
||
nmx = 0;
|
||
buflen = sizeof(hostbuf);
|
||
cp = (u8_t *)answer + sizeof(HEADER);
|
||
if (qdcount) {
|
||
cp += dn_skipname((u8_t *)cp,(u8_t *)eom) + QFIXEDSZ;
|
||
while (--qdcount > 0)
|
||
cp += dn_skipname((u8_t *)cp,(u8_t *)eom) + QFIXEDSZ;
|
||
}
|
||
if (ancount) {
|
||
if (!hp->aa)
|
||
if (verbose && isls == 0)
|
||
printf("The following answer is not authoritative:\n");
|
||
while (--ancount >= 0 && cp && cp < eom) {
|
||
cp = pr_rr(cp, (u8_t *)answer, stdout, filter);
|
||
/*
|
||
* When we ask for address and there is a CNAME, it seems to return
|
||
* both the CNAME and the address. Since we trace down the CNAME
|
||
* chain ourselves, we don't really want to print the address at
|
||
* this point.
|
||
*/
|
||
if (cname && ! verbose)
|
||
return (1);
|
||
}
|
||
}
|
||
if (! verbose)
|
||
return (1);
|
||
if (nscount) {
|
||
printf("For authoritative answers, see:\n");
|
||
while (--nscount >= 0 && cp && cp < eom) {
|
||
cp = pr_rr(cp, (u8_t *)answer, stdout, filter);
|
||
}
|
||
}
|
||
if (arcount) {
|
||
printf("Additional information:\n");
|
||
while (--arcount >= 0 && cp && cp < eom) {
|
||
cp = pr_rr(cp, (u8_t *)answer, stdout, filter);
|
||
}
|
||
}
|
||
return(1);
|
||
}
|
||
|
||
static u8_t cnamebuf[MAXDNAME];
|
||
|
||
/*
|
||
* Print resource record fields in human readable form.
|
||
*/
|
||
static u8_t *
|
||
pr_rr(cp, msg, file, filter)
|
||
u8_t *cp, *msg;
|
||
FILE *file;
|
||
int filter;
|
||
{
|
||
int type, class, dlen, n, c, proto, ttl;
|
||
struct in_addr inaddr;
|
||
u8_t *cp1;
|
||
struct protoent *protop;
|
||
struct servent *servp;
|
||
char punc;
|
||
int doprint;
|
||
u8_t name[MAXDNAME];
|
||
|
||
if ((cp = pr_cdname(cp, msg, name, sizeof(name))) == NULL)
|
||
return (NULL); /* compression error */
|
||
|
||
type = _getshort(cp);
|
||
cp += sizeof(u_short);
|
||
|
||
class = _getshort(cp);
|
||
cp += sizeof(u_short);
|
||
|
||
ttl = _getlong(cp);
|
||
cp += sizeof(u_long);
|
||
|
||
if (filter == type || filter == T_ANY ||
|
||
(filter == T_A && (type == T_PTR || type == T_NS)))
|
||
doprint = 1;
|
||
else
|
||
doprint = 0;
|
||
|
||
if (doprint)
|
||
if (verbose)
|
||
fprintf(file,"%s\t%d%s\t%s",
|
||
name, ttl, pr_class(class), pr_type(type));
|
||
else {
|
||
fprintf(file,"%s%s %s",name, pr_class(class), pr_type(type));
|
||
}
|
||
if (verbose)
|
||
punc = '\t';
|
||
else
|
||
punc = ' ';
|
||
|
||
dlen = _getshort(cp);
|
||
cp += sizeof(u_short);
|
||
cp1 = cp;
|
||
/*
|
||
* Print type specific data, if appropriate
|
||
*/
|
||
switch (type) {
|
||
case T_A:
|
||
switch (class) {
|
||
case C_IN:
|
||
bcopy((char *)cp, (char *)&inaddr, sizeof(inaddr));
|
||
if (dlen == 4) {
|
||
if (doprint)
|
||
fprintf(file,"%c%s", punc,
|
||
inet_ntoa(inaddr));
|
||
cp += dlen;
|
||
} else if (dlen == 7) {
|
||
if (doprint) {
|
||
fprintf(file,"%c%s", punc,
|
||
inet_ntoa(inaddr));
|
||
fprintf(file,", protocol = %d", cp[4]);
|
||
fprintf(file,", port = %d",
|
||
(cp[5] << 8) + cp[6]);
|
||
}
|
||
cp += dlen;
|
||
}
|
||
break;
|
||
}
|
||
break;
|
||
case T_CNAME:
|
||
if (dn_expand(msg, msg + 512, cp, cnamebuf,
|
||
sizeof(cnamebuf)-1) >= 0) {
|
||
strcat((char *) cnamebuf, ".");
|
||
if (gettype != T_CNAME && gettype != T_ANY)
|
||
cname = cnamebuf;
|
||
}
|
||
case T_MB:
|
||
#ifdef OLDRR
|
||
case T_MD:
|
||
case T_MF:
|
||
#endif /* OLDRR */
|
||
case T_MG:
|
||
case T_MR:
|
||
case T_NS:
|
||
case T_PTR:
|
||
cp = pr_cdname(cp, msg, name, sizeof(name));
|
||
if (doprint)
|
||
fprintf(file,"%c%s",punc, name);
|
||
break;
|
||
|
||
case T_HINFO:
|
||
if ((n = *cp++)) {
|
||
if (doprint)
|
||
fprintf(file,"%c%.*s", punc, n, cp);
|
||
cp += n;
|
||
}
|
||
if ((n = *cp++)) {
|
||
if (doprint)
|
||
fprintf(file,"%c%.*s", punc, n, cp);
|
||
cp += n;
|
||
}
|
||
break;
|
||
|
||
case T_SOA:
|
||
cp = pr_cdname(cp, msg, name, sizeof(name));
|
||
if (doprint)
|
||
fprintf(file,"\t%s", name);
|
||
cp = pr_cdname(cp, msg, name, sizeof(name));
|
||
if (doprint)
|
||
fprintf(file," %s", name);
|
||
if (doprint)
|
||
fprintf(file,"(\n\t\t\t%d\t;serial (version)", _getlong(cp));
|
||
cp += sizeof(u_long);
|
||
if (doprint)
|
||
fprintf(file,"\n\t\t\t%d\t;refresh period", _getlong(cp));
|
||
cp += sizeof(u_long);
|
||
if (doprint)
|
||
fprintf(file,"\n\t\t\t%d\t;retry refresh this often", _getlong(cp));
|
||
cp += sizeof(u_long);
|
||
if (doprint)
|
||
fprintf(file,"\n\t\t\t%d\t;expiration period", _getlong(cp));
|
||
cp += sizeof(u_long);
|
||
if (doprint)
|
||
fprintf(file,"\n\t\t\t%d\t;minimum TTL\n\t\t\t)", _getlong(cp));
|
||
cp += sizeof(u_long);
|
||
break;
|
||
|
||
case T_MX:
|
||
if (doprint) {
|
||
if (verbose)
|
||
fprintf(file,"\t%d ",_getshort(cp));
|
||
else
|
||
fprintf(file," (pri=%d) by ",_getshort(cp));
|
||
}
|
||
cp += sizeof(u_short);
|
||
cp = pr_cdname(cp, msg, name, sizeof(name));
|
||
if (doprint)
|
||
fprintf(file, "%s", name);
|
||
break;
|
||
|
||
case T_MINFO:
|
||
cp = pr_cdname(cp, msg, name, sizeof(name));
|
||
if (doprint)
|
||
fprintf(file,"%c%s",punc, name);
|
||
cp = pr_cdname(cp, msg, name, sizeof(name));
|
||
if (doprint)
|
||
fprintf(file," %s", name);
|
||
break;
|
||
|
||
/* Roy start */
|
||
case T_TXT:
|
||
if ((n = *cp++)) {
|
||
if (doprint)
|
||
fprintf(file,"%c%.*s", punc, n, cp);
|
||
cp += n;
|
||
}
|
||
break;
|
||
/* Roy end */
|
||
case T_WKS:
|
||
if (dlen < sizeof(u_long) + 1)
|
||
break;
|
||
bcopy((char *)cp, (char *)&inaddr, sizeof(inaddr));
|
||
cp += sizeof(u_long);
|
||
proto = *cp++;
|
||
protop = getprotobynumber(proto);
|
||
if (doprint)
|
||
if (protop)
|
||
fprintf(file,"%c%s %s", punc,
|
||
inet_ntoa(inaddr), protop->p_name);
|
||
else
|
||
fprintf(file,"%c%s %d", punc,
|
||
inet_ntoa(inaddr), proto);
|
||
|
||
n = 0;
|
||
while (cp < cp1 + dlen) {
|
||
c = *cp++;
|
||
do {
|
||
if (c & 0200) {
|
||
servp = NULL;
|
||
if (protop)
|
||
servp = getservbyport (htons(n),
|
||
protop->p_name);
|
||
if (doprint)
|
||
if (servp)
|
||
fprintf(file, " %s", servp->s_name);
|
||
else
|
||
fprintf(file, " %d", n);
|
||
}
|
||
c <<= 1;
|
||
} while (++n & 07);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
if (doprint)
|
||
fprintf(file,"%c???", punc);
|
||
cp += dlen;
|
||
}
|
||
if (cp != cp1 + dlen)
|
||
fprintf(file,"packet size error (%#x != %#x)\n", cp, cp1+dlen);
|
||
if (doprint)
|
||
fprintf(file,"\n");
|
||
return (cp);
|
||
}
|
||
|
||
static char nbuf[20];
|
||
|
||
/*
|
||
* Return a string for the type
|
||
*/
|
||
static char *
|
||
pr_type(type)
|
||
int type;
|
||
{
|
||
switch (type) {
|
||
case T_A:
|
||
return(verbose? "A" : "has address");
|
||
case T_NS: /* authoritative server */
|
||
return("NS");
|
||
#ifdef OLDRR
|
||
case T_MD: /* mail destination */
|
||
return("MD");
|
||
case T_MF: /* mail forwarder */
|
||
return("MF");
|
||
#endif /* OLDRR */
|
||
case T_CNAME: /* connonical name */
|
||
return(verbose? "CNAME" : "is a nickname for");
|
||
case T_SOA: /* start of authority zone */
|
||
return("SOA");
|
||
case T_MB: /* mailbox domain name */
|
||
return("MB");
|
||
case T_MG: /* mail group member */
|
||
return("MG");
|
||
case T_MX: /* mail routing info */
|
||
return(verbose? "MX" : "mail is handled");
|
||
/* Roy start */
|
||
case T_TXT: /* TXT - descriptive info */
|
||
return(verbose? "TXT" : "descriptive text");
|
||
/* Roy end */
|
||
case T_MR: /* mail rename name */
|
||
return("MR");
|
||
case T_NULL: /* null resource record */
|
||
return("NULL");
|
||
case T_WKS: /* well known service */
|
||
return("WKS");
|
||
case T_PTR: /* domain name pointer */
|
||
return("PTR");
|
||
case T_HINFO: /* host information */
|
||
return("HINFO");
|
||
case T_MINFO: /* mailbox information */
|
||
return("MINFO");
|
||
case T_AXFR: /* zone transfer */
|
||
return("AXFR");
|
||
case T_MAILB: /* mail box */
|
||
return("MAILB");
|
||
case T_MAILA: /* mail address */
|
||
return("MAILA");
|
||
case T_ANY: /* matches any type */
|
||
return("ANY");
|
||
default:
|
||
return (sprintf(nbuf, "%d", type) == EOF ? NULL : nbuf);
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Return a mnemonic for class
|
||
*/
|
||
static char *
|
||
pr_class(class)
|
||
int class;
|
||
{
|
||
|
||
switch (class) {
|
||
case C_IN: /* internet class */
|
||
return(verbose? " IN" : "");
|
||
case C_CHAOS: /* chaos class */
|
||
return(verbose? " CHAOS" : "");
|
||
case C_HS: /* Hesiod class */
|
||
return(verbose? " HS" : "");
|
||
case C_ANY: /* matches any class */
|
||
return(" ANY");
|
||
default:
|
||
return (sprintf(nbuf," %d", class) == EOF ? NULL : nbuf);
|
||
}
|
||
}
|
||
|
||
static u8_t *
|
||
pr_cdname(cp, msg, name, namelen)
|
||
u8_t *cp, *msg;
|
||
u8_t *name;
|
||
int namelen;
|
||
{
|
||
int n;
|
||
|
||
if ((n = dn_expand(msg, msg + 512, cp, name, namelen - 2)) < 0)
|
||
return (NULL);
|
||
if (name[0] == '\0') {
|
||
name[0] = '.';
|
||
name[1] = '\0';
|
||
}
|
||
return (cp + n);
|
||
}
|
||
|
||
char *resultcodes[] = {
|
||
"NOERROR",
|
||
"FORMERR",
|
||
"SERVFAIL",
|
||
"NXDOMAIN",
|
||
"NOTIMP",
|
||
"REFUSED",
|
||
"6",
|
||
"7",
|
||
"8",
|
||
"9",
|
||
"10",
|
||
"11",
|
||
"12",
|
||
"13",
|
||
"14",
|
||
"NOCHANGE",
|
||
};
|
||
|
||
|
||
|
||
/*
|
||
******************************************************************************
|
||
*
|
||
* ListHosts --
|
||
*
|
||
* Requests the name server to do a zone transfer so we
|
||
* find out what hosts it knows about.
|
||
*
|
||
* Results:
|
||
* SUCCESS the listing was successful.
|
||
* ERROR the server could not be contacted because
|
||
* a socket could not be obtained or an error
|
||
* occured while receiving, or the output file
|
||
* could not be opened.
|
||
*
|
||
******************************************************************************
|
||
*/
|
||
|
||
static int
|
||
ListHosts(namePtr, queryType)
|
||
char *namePtr;
|
||
int queryType; /* e.g. T_A */
|
||
{
|
||
querybuf_t buf, answer;
|
||
HEADER *headerPtr;
|
||
|
||
int msglen;
|
||
int amtToRead;
|
||
int numRead;
|
||
int i;
|
||
int numAnswers = 0;
|
||
int result;
|
||
int soacnt = 0;
|
||
u_short len;
|
||
int dlen;
|
||
int type;
|
||
int nscount;
|
||
u8_t *cp, *nmp;
|
||
u8_t name[NAME_LEN];
|
||
char dname[2][NAME_LEN];
|
||
u8_t domain[NAME_LEN];
|
||
/* names and addresses of name servers to try */
|
||
#define NUMNS 8
|
||
char nsname[NUMNS][NAME_LEN];
|
||
int nshaveaddr[NUMNS];
|
||
#define IPADDRSIZE 4
|
||
#define NUMNSADDR 16
|
||
char nsipaddr[NUMNSADDR][IPADDRSIZE];
|
||
int numns;
|
||
int numnsaddr;
|
||
int thisns;
|
||
struct hostent *hp;
|
||
enum {
|
||
NO_ERRORS,
|
||
ERR_READING_LEN,
|
||
ERR_READING_MSG,
|
||
ERR_PRINTING
|
||
} error = NO_ERRORS;
|
||
char *tcp_serv_name;
|
||
int tcp_fd;
|
||
nwio_tcpconf_t tcpconf;
|
||
nwio_tcpcl_t clopt;
|
||
int terrno;
|
||
|
||
/*
|
||
* normalize to not have trailing dot. We do string compares below
|
||
* of info from name server, and it won't have trailing dots.
|
||
*/
|
||
i = strlen(namePtr);
|
||
if (namePtr[i-1] == '.')
|
||
namePtr[i-1] = 0;
|
||
|
||
if (server_specified) {
|
||
bcopy((char *)&_res.nsaddr, nsipaddr[0], IPADDRSIZE);
|
||
numnsaddr = 1;
|
||
}
|
||
else {
|
||
|
||
/*
|
||
* First we have to find out where to look. This needs a NS query,
|
||
* possibly followed by looking up addresses for some of the names.
|
||
*/
|
||
|
||
msglen = res_mkquery(QUERY, namePtr, C_IN, T_NS,
|
||
(char *)0, 0, (struct rrec *)0,
|
||
(char *)&buf, sizeof(buf));
|
||
|
||
if (msglen < 0) {
|
||
printf("res_mkquery failed\n");
|
||
return (ERROR);
|
||
}
|
||
|
||
msglen = res_send((char *)&buf,msglen,(char *)&answer, sizeof(answer));
|
||
|
||
if (msglen < 0) {
|
||
printf("Unable to get to nameserver -- try again later\n");
|
||
return (ERROR);
|
||
}
|
||
if (_res.options & RES_DEBUG || verbose)
|
||
printf("rcode = %d (%s), ancount=%d\n",
|
||
answer.qb1.rcode,
|
||
DecodeError(answer.qb1.rcode),
|
||
ntohs(answer.qb1.ancount));
|
||
|
||
/*
|
||
* Analyze response to our NS lookup
|
||
*/
|
||
|
||
nscount = ntohs(answer.qb1.ancount) +
|
||
ntohs(answer.qb1.nscount) +
|
||
ntohs(answer.qb1.arcount);
|
||
|
||
|
||
if (answer.qb1.rcode != NOERROR || nscount == 0) {
|
||
switch (answer.qb1.rcode) {
|
||
case NXDOMAIN:
|
||
/* Check if it's an authoritive answer */
|
||
if (answer.qb1.aa) {
|
||
printf("No such domain\n");
|
||
} else {
|
||
printf("Unable to get information about domain -- try again later.\n");
|
||
}
|
||
break;
|
||
case SERVFAIL:
|
||
printf("Unable to get information about that domain -- try again later.\n");
|
||
break;
|
||
case NOERROR:
|
||
printf("That domain exists, but seems to be a leaf node.\n");
|
||
break;
|
||
case FORMERR:
|
||
case NOTIMP:
|
||
case REFUSED:
|
||
printf("Unrecoverable error looking up domain name.\n");
|
||
break;
|
||
}
|
||
return (0);
|
||
}
|
||
|
||
cp = answer.qb2 + sizeof(HEADER);
|
||
if (ntohs(answer.qb1.qdcount) > 0)
|
||
cp += dn_skipname(cp, answer.qb2 + msglen) + QFIXEDSZ;
|
||
|
||
numns = 0;
|
||
numnsaddr = 0;
|
||
|
||
/*
|
||
* Look at response from NS lookup for NS and A records.
|
||
*/
|
||
|
||
for (;nscount; nscount--) {
|
||
cp += dn_expand(answer.qb2, answer.qb2 + msglen, cp,
|
||
domain, sizeof(domain));
|
||
type = _getshort(cp);
|
||
cp += sizeof(u_short) + sizeof(u_short) + sizeof(u_long);
|
||
dlen = _getshort(cp);
|
||
cp += sizeof(u_short);
|
||
if (type == T_NS) {
|
||
if (dn_expand(answer.qb2, answer.qb2 + msglen, cp,
|
||
name, sizeof(name)) >= 0) {
|
||
if (numns < NUMNS && strcasecmp((char *)domain, namePtr) == 0) {
|
||
for (i = 0; i < numns; i++)
|
||
if (strcasecmp(nsname[i], (char *)name) == 0)
|
||
break; /* duplicate */
|
||
if (i >= numns) {
|
||
strncpy(nsname[numns], (char *)name, sizeof(name));
|
||
nshaveaddr[numns] = 0;
|
||
numns++;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
else if (type == T_A) {
|
||
if (numnsaddr < NUMNSADDR)
|
||
for (i = 0; i < numns; i++) {
|
||
if (strcasecmp(nsname[i], (char *)domain) == 0) {
|
||
nshaveaddr[i]++;
|
||
bcopy((char *)cp, nsipaddr[numnsaddr],IPADDRSIZE);
|
||
numnsaddr++;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
cp += dlen;
|
||
}
|
||
|
||
/*
|
||
* Usually we'll get addresses for all the servers in the additional
|
||
* info section. But in case we don't, look up their addresses.
|
||
*/
|
||
|
||
for (i = 0; i < numns; i++) {
|
||
if (! nshaveaddr[i]) {
|
||
register long **hptr;
|
||
int numaddrs = 0;
|
||
|
||
hp = gethostbyname(nsname[i]);
|
||
if (hp) {
|
||
for (hptr = (long **)hp->h_addr_list; *hptr; hptr++)
|
||
if (numnsaddr < NUMNSADDR) {
|
||
bcopy((char *)*hptr, nsipaddr[numnsaddr],IPADDRSIZE);
|
||
numnsaddr++;
|
||
numaddrs++;
|
||
}
|
||
}
|
||
if (_res.options & RES_DEBUG || verbose)
|
||
printf("Found %d addresses for %s by extra query\n",
|
||
numaddrs, nsname[i]);
|
||
}
|
||
else
|
||
if (_res.options & RES_DEBUG || verbose)
|
||
printf("Found %d addresses for %s\n",
|
||
nshaveaddr[i], nsname[i]);
|
||
}
|
||
}
|
||
/*
|
||
* Now nsipaddr has numnsaddr addresses for name servers that
|
||
* serve the requested domain. Now try to find one that will
|
||
* accept a zone transfer.
|
||
*/
|
||
|
||
thisns = 0;
|
||
|
||
again:
|
||
|
||
numAnswers = 0;
|
||
soacnt = 0;
|
||
|
||
/*
|
||
* Create a query packet for the requested domain name.
|
||
*
|
||
*/
|
||
msglen = res_mkquery(QUERY, namePtr, getclass, T_AXFR,
|
||
(char *)0, 0, (struct rrec *)0,
|
||
(char *) &buf, sizeof(buf));
|
||
if (msglen < 0) {
|
||
if (_res.options & RES_DEBUG) {
|
||
fprintf(stderr, "ListHosts: Res_mkquery failed\n");
|
||
}
|
||
return (ERROR);
|
||
}
|
||
|
||
/*
|
||
* Set up a virtual circuit to the server.
|
||
*/
|
||
|
||
tcp_serv_name= getenv("TCP_DEVICE");
|
||
if (!tcp_serv_name)
|
||
tcp_serv_name= TCP_DEVICE;
|
||
for (;thisns < numnsaddr; thisns++)
|
||
{
|
||
tcp_fd= open(tcp_serv_name, O_RDWR);
|
||
if (tcp_fd == -1)
|
||
{
|
||
fprintf(stderr, "unable to open '%s': %s\n", tcp_serv_name,
|
||
strerror(errno));
|
||
return ERROR;
|
||
}
|
||
|
||
tcpconf.nwtc_flags= NWTC_EXCL | NWTC_LP_SEL | NWTC_SET_RA |
|
||
NWTC_SET_RP;
|
||
tcpconf.nwtc_remaddr= *(ipaddr_t *)nsipaddr[thisns];
|
||
tcpconf.nwtc_remport= _res.nsaddr.sin_port;
|
||
result= ioctl(tcp_fd, NWIOSTCPCONF, &tcpconf);
|
||
if (result == -1)
|
||
{
|
||
fprintf(stderr, "tcp_ioc_setconf failed: %s\n",
|
||
strerror(errno));
|
||
close(tcp_fd);
|
||
return ERROR;
|
||
}
|
||
if (_res.options & RES_DEBUG || verbose)
|
||
printf("Trying %s\n", inet_ntoa(tcpconf.nwtc_remaddr));
|
||
clopt.nwtcl_flags= 0;
|
||
result= ioctl(tcp_fd, NWIOTCPCONN, &clopt);
|
||
if (result == 0)
|
||
break;
|
||
terrno= errno;
|
||
if (verbose)
|
||
fprintf(stderr,
|
||
"Connection failed, trying next server: %s\n",
|
||
strerror(errno));
|
||
close(tcp_fd);
|
||
}
|
||
if (thisns >= numnsaddr) {
|
||
printf("No server for that domain responded\n");
|
||
if (!verbose)
|
||
fprintf(stderr, "Error from the last server was: %s\n",
|
||
strerror(terrno));
|
||
return(ERROR);
|
||
}
|
||
|
||
/*
|
||
* Send length & message for zone transfer
|
||
*/
|
||
|
||
len = htons(msglen);
|
||
|
||
result= tcpip_writeall(tcp_fd, (char *)&len, sizeof(len));
|
||
if (result != sizeof(len))
|
||
{
|
||
fprintf(stderr, "write failed: %s\n", strerror(errno));
|
||
close(tcp_fd);
|
||
return ERROR;
|
||
}
|
||
result= tcpip_writeall(tcp_fd, (char *)&buf, msglen);
|
||
if (result != msglen)
|
||
{
|
||
fprintf(stderr, "write failed: %s\n",
|
||
strerror(errno));
|
||
close(tcp_fd);
|
||
return ERROR;
|
||
}
|
||
filePtr = stdout;
|
||
|
||
while (1) {
|
||
|
||
/*
|
||
* Read the length of the response.
|
||
*/
|
||
|
||
cp = (u8_t *) &buf;
|
||
amtToRead = sizeof(u_short);
|
||
while(amtToRead > 0)
|
||
{
|
||
result = read(tcp_fd, (char *)cp, amtToRead);
|
||
if (result <= 0)
|
||
break;
|
||
cp += result;
|
||
amtToRead -= result;
|
||
}
|
||
if (amtToRead) {
|
||
error = ERR_READING_LEN;
|
||
break;
|
||
}
|
||
|
||
if ((len = htons(*(u_short *)&buf)) == 0) {
|
||
break; /* nothing left to read */
|
||
}
|
||
|
||
/*
|
||
* Read the response.
|
||
*/
|
||
|
||
amtToRead = len;
|
||
cp = (u8_t *) &buf;
|
||
while(amtToRead > 0)
|
||
{
|
||
result = read(tcp_fd, (char *)cp, amtToRead);
|
||
if (result<= 0)
|
||
break;
|
||
cp += result;
|
||
amtToRead -= result;
|
||
}
|
||
if (amtToRead) {
|
||
error = ERR_READING_MSG;
|
||
break;
|
||
}
|
||
|
||
i = buf.qb1.rcode;
|
||
|
||
if (i != NOERROR || ntohs(buf.qb1.ancount) == 0) {
|
||
if ((thisns+1) < numnsaddr &&
|
||
(i == SERVFAIL || i == NOTIMP || i == REFUSED)) {
|
||
if (_res.options & RES_DEBUG || verbose)
|
||
printf("Server failed, trying next server: %s\n",
|
||
i != NOERROR ?
|
||
DecodeError(i) : "Premature end of data");
|
||
close(tcp_fd);
|
||
thisns++;
|
||
goto again;
|
||
}
|
||
printf("Server failed: %s\n",
|
||
i != NOERROR ? DecodeError(i) : "Premature end of data");
|
||
break;
|
||
}
|
||
|
||
|
||
result = printinfo(&buf, cp, queryType, 1);
|
||
if (! result) {
|
||
error = ERR_PRINTING;
|
||
break;
|
||
}
|
||
numAnswers++;
|
||
cp = buf.qb2 + sizeof(HEADER);
|
||
if (ntohs(buf.qb1.qdcount) > 0)
|
||
cp += dn_skipname(cp, buf.qb2 + len) + QFIXEDSZ;
|
||
|
||
nmp = cp;
|
||
cp += dn_skipname(cp, (u_char *)&buf + len);
|
||
if ((_getshort(cp) == T_SOA)) {
|
||
dn_expand(buf.qb2, buf.qb2 + len, nmp, (u8_t *)dname[soacnt],
|
||
sizeof(dname[0]));
|
||
if (soacnt) {
|
||
if (strcmp(dname[0], dname[1]) == 0)
|
||
break;
|
||
} else
|
||
soacnt++;
|
||
}
|
||
}
|
||
|
||
close(tcp_fd);
|
||
|
||
switch (error) {
|
||
case NO_ERRORS:
|
||
return (SUCCESS);
|
||
|
||
case ERR_READING_LEN:
|
||
return(ERROR);
|
||
|
||
case ERR_PRINTING:
|
||
fprintf(stderr,"*** Error during listing of %s: %s\n",
|
||
namePtr, DecodeError(result));
|
||
return(result);
|
||
|
||
case ERR_READING_MSG:
|
||
headerPtr = (HEADER *) &buf;
|
||
fprintf(stderr,"ListHosts: error receiving zone transfer:\n");
|
||
fprintf(stderr,
|
||
" result: %s, answers = %d, authority = %d, additional = %d\n",
|
||
resultcodes[headerPtr->rcode],
|
||
ntohs(headerPtr->ancount),
|
||
ntohs(headerPtr->nscount),
|
||
ntohs(headerPtr->arcount));
|
||
return(ERROR);
|
||
default:
|
||
return(ERROR);
|
||
}
|
||
}
|
||
|
||
static char *
|
||
DecodeError(result)
|
||
int result;
|
||
{
|
||
switch(result) {
|
||
case NOERROR: return("Success"); break;
|
||
case FORMERR: return("Format error"); break;
|
||
case SERVFAIL: return("Server failed"); break;
|
||
case NXDOMAIN: return("Non-existent domain"); break;
|
||
case NOTIMP: return("Not implemented"); break;
|
||
case REFUSED: return("Query refused"); break;
|
||
case NOCHANGE: return("No change"); break;
|
||
case NO_INFO: return("No information"); break;
|
||
case ERROR: return("Unspecified error"); break;
|
||
case TIME_OUT: return("Timed out"); break;
|
||
case NONAUTH: return("Non-authoritative answer"); break;
|
||
default: break;
|
||
}
|
||
return("BAD ERROR VALUE");
|
||
}
|
||
|
||
static int tcpip_writeall(fd, buf, siz)
|
||
int fd;
|
||
char *buf;
|
||
unsigned siz;
|
||
{
|
||
unsigned siz_org;
|
||
int nbytes;
|
||
|
||
siz_org= siz;
|
||
|
||
while (siz)
|
||
{
|
||
nbytes= write(fd, buf, siz);
|
||
if (nbytes == -1)
|
||
return nbytes;
|
||
assert(siz >= nbytes);
|
||
buf += nbytes;
|
||
siz -= nbytes;
|
||
}
|
||
return siz_org;
|
||
}
|