/avm2_env/usr/src/lib/libc/net/getnetbydns.c
C | 465 lines | 356 code | 30 blank | 79 comment | 87 complexity | 22ee8eb688f3a24ffe6c582875a17780 MD5 | raw file
Possible License(s): GPL-3.0, Apache-2.0, CC-BY-SA-3.0, LGPL-3.0, MPL-2.0-no-copyleft-exception, GPL-2.0, LGPL-2.1, AGPL-1.0, BSD-3-Clause, LGPL-2.0
- /*-
- * Copyright (c) 1985, 1988, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * -
- * Portions Copyright (c) 1993 by Digital Equipment Corporation.
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies, and that
- * the name of Digital Equipment Corporation not be used in advertising or
- * publicity pertaining to distribution of the document or software without
- * specific, written prior permission.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
- * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
- * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
- * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
- * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
- * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
- * SOFTWARE.
- * -
- * --Copyright--
- */
- /* Portions Copyright (c) 1993 Carlos Leandro and Rui Salgueiro
- * Dep. Matematica Universidade de Coimbra, Portugal, Europe
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- */
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)gethostnamadr.c 8.1 (Berkeley) 6/4/93";
- #endif /* LIBC_SCCS and not lint */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD: src/lib/libc/net/getnetbydns.c,v 1.34.10.2.2.1 2010/12/21 17:09:25 kensmith Exp $");
- #include <sys/param.h>
- #include <sys/socket.h>
- #include <netinet/in.h>
- #include <arpa/inet.h>
- #include <arpa/nameser.h>
- #include <errno.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <netdb.h>
- #include <resolv.h>
- #include <ctype.h>
- #include <string.h>
- #include <unistd.h>
- #include <syslog.h>
- #include <stdarg.h>
- #include <nsswitch.h>
- #include "netdb_private.h"
- #include "res_config.h"
- #define BYADDR 0
- #define BYNAME 1
- #define MAXPACKET (64*1024)
- typedef union {
- HEADER hdr;
- u_char buf[MAXPACKET];
- } querybuf;
- typedef union {
- long al;
- char ac;
- } align;
- /*
- * Reverse the order of first four dotted entries of in.
- * Out must contain space for at least strlen(in) characters.
- * The result does not include any leading 0s of in.
- */
- static void
- ipreverse(char *in, char *out)
- {
- char *pos[4];
- int len[4];
- char *p, *start;
- int i = 0;
- int leading = 1;
- /* Fill-in element positions and lengths: pos[], len[]. */
- start = p = in;
- for (;;) {
- if (*p == '.' || *p == '\0') {
- /* Leading 0? */
- if (leading && p - start == 1 && *start == '0')
- len[i] = 0;
- else {
- len[i] = p - start;
- leading = 0;
- }
- pos[i] = start;
- start = p + 1;
- i++;
- }
- if (i == 4)
- break;
- if (*p == 0) {
- for (; i < 4; i++) {
- pos[i] = p;
- len[i] = 0;
- }
- break;
- }
- p++;
- }
- /* Copy the entries in reverse order */
- p = out;
- leading = 1;
- for (i = 3; i >= 0; i--) {
- memcpy(p, pos[i], len[i]);
- if (len[i])
- leading = 0;
- p += len[i];
- /* Need a . separator? */
- if (!leading && i > 0 && len[i - 1])
- *p++ = '.';
- }
- *p = '\0';
- }
- static int
- getnetanswer(querybuf *answer, int anslen, int net_i, struct netent *ne,
- struct netent_data *ned, res_state statp)
- {
- HEADER *hp;
- u_char *cp;
- int n;
- u_char *eom;
- int type, class, ancount, qdcount, haveanswer;
- char aux[MAXHOSTNAMELEN];
- char ans[MAXHOSTNAMELEN];
- char *in, *bp, *ep, **ap;
- /*
- * find first satisfactory answer
- *
- * answer --> +------------+ ( MESSAGE )
- * | Header |
- * +------------+
- * | Question | the question for the name server
- * +------------+
- * | Answer | RRs answering the question
- * +------------+
- * | Authority | RRs pointing toward an authority
- * | Additional | RRs holding additional information
- * +------------+
- */
- eom = answer->buf + anslen;
- hp = &answer->hdr;
- ancount = ntohs(hp->ancount); /* #/records in the answer section */
- qdcount = ntohs(hp->qdcount); /* #/entries in the question section */
- bp = ned->netbuf;
- ep = ned->netbuf + sizeof(ned->netbuf);
- cp = answer->buf + HFIXEDSZ;
- if (!qdcount) {
- if (hp->aa)
- RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
- else
- RES_SET_H_ERRNO(statp, TRY_AGAIN);
- return (-1);
- }
- while (qdcount-- > 0)
- cp += __dn_skipname(cp, eom) + QFIXEDSZ;
- ap = ned->net_aliases;
- *ap = NULL;
- ne->n_aliases = ned->net_aliases;
- haveanswer = 0;
- while (--ancount >= 0 && cp < eom) {
- n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
- if ((n < 0) || !res_dnok(bp))
- break;
- cp += n;
- ans[0] = '\0';
- (void)strncpy(&ans[0], bp, sizeof(ans) - 1);
- ans[sizeof(ans) - 1] = '\0';
- GETSHORT(type, cp);
- GETSHORT(class, cp);
- cp += INT32SZ; /* TTL */
- GETSHORT(n, cp);
- if (class == C_IN && type == T_PTR) {
- n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
- if ((n < 0) || !res_hnok(bp)) {
- cp += n;
- return (-1);
- }
- cp += n;
- *ap++ = bp;
- n = strlen(bp) + 1;
- bp += n;
- ne->n_addrtype = (class == C_IN) ? AF_INET : AF_UNSPEC;
- haveanswer++;
- }
- }
- if (haveanswer) {
- *ap = NULL;
- switch (net_i) {
- case BYADDR:
- ne->n_name = *ne->n_aliases;
- ne->n_net = 0L;
- break;
- case BYNAME:
- in = *ne->n_aliases;
- n = strlen(ans) + 1;
- if (ep - bp < n) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- errno = ENOBUFS;
- return (-1);
- }
- strlcpy(bp, ans, ep - bp);
- ne->n_name = bp;
- if (strlen(in) + 1 > sizeof(aux)) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- errno = ENOBUFS;
- return (-1);
- }
- ipreverse(in, aux);
- ne->n_net = inet_network(aux);
- break;
- }
- ne->n_aliases++;
- return (0);
- }
- RES_SET_H_ERRNO(statp, TRY_AGAIN);
- return (-1);
- }
- int
- _dns_getnetbyaddr(void *rval, void *cb_data, va_list ap)
- {
- uint32_t net;
- int net_type;
- char *buffer;
- size_t buflen;
- int *errnop, *h_errnop;
- struct netent *nptr, ne;
- struct netent_data *ned;
- unsigned int netbr[4];
- int nn, anslen, error;
- querybuf *buf;
- char qbuf[MAXDNAME];
- uint32_t net2;
- res_state statp;
- net = va_arg(ap, uint32_t);
- net_type = va_arg(ap, int);
- nptr = va_arg(ap, struct netent *);
- buffer = va_arg(ap, char *);
- buflen = va_arg(ap, size_t);
- errnop = va_arg(ap, int *);
- h_errnop = va_arg(ap, int *);
- statp = __res_state();
- if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_UNAVAIL);
- }
- if ((ned = __netent_data_init()) == NULL) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_UNAVAIL);
- }
- *((struct netent **)rval) = NULL;
- if (net_type != AF_INET) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_UNAVAIL);
- }
- for (nn = 4, net2 = net; net2; net2 >>= 8)
- netbr[--nn] = net2 & 0xff;
- switch (nn) {
- case 3: /* Class A */
- sprintf(qbuf, "0.0.0.%u.in-addr.arpa", netbr[3]);
- break;
- case 2: /* Class B */
- sprintf(qbuf, "0.0.%u.%u.in-addr.arpa", netbr[3], netbr[2]);
- break;
- case 1: /* Class C */
- sprintf(qbuf, "0.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
- netbr[1]);
- break;
- case 0: /* Class D - E */
- sprintf(qbuf, "%u.%u.%u.%u.in-addr.arpa", netbr[3], netbr[2],
- netbr[1], netbr[0]);
- break;
- }
- if ((buf = malloc(sizeof(*buf))) == NULL) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_NOTFOUND);
- }
- anslen = res_nquery(statp, qbuf, C_IN, T_PTR, (u_char *)buf,
- sizeof(*buf));
- if (anslen < 0) {
- free(buf);
- #ifdef DEBUG
- if (statp->options & RES_DEBUG)
- printf("res_nsearch failed\n");
- #endif
- *h_errnop = statp->res_h_errno;
- return (NS_UNAVAIL);
- } else if (anslen > sizeof(*buf)) {
- free(buf);
- #ifdef DEBUG
- if (statp->options & RES_DEBUG)
- printf("res_nsearch static buffer too small\n");
- #endif
- *h_errnop = statp->res_h_errno;
- return (NS_UNAVAIL);
- }
- error = getnetanswer(buf, anslen, BYADDR, &ne, ned, statp);
- free(buf);
- if (error == 0) {
- /* Strip trailing zeros */
- while ((net & 0xff) == 0 && net != 0)
- net >>= 8;
- ne.n_net = net;
- if (__copy_netent(&ne, nptr, buffer, buflen) != 0) {
- *errnop = errno;
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_RETURN);
- }
- *((struct netent **)rval) = nptr;
- return (NS_SUCCESS);
- }
- *h_errnop = statp->res_h_errno;
- return (NS_NOTFOUND);
- }
- int
- _dns_getnetbyname(void *rval, void *cb_data, va_list ap)
- {
- const char *net;
- char *buffer;
- size_t buflen;
- int *errnop, *h_errnop;
- struct netent *nptr, ne;
- struct netent_data *ned;
- int anslen, error;
- querybuf *buf;
- char qbuf[MAXDNAME];
- res_state statp;
- net = va_arg(ap, const char *);
- nptr = va_arg(ap, struct netent *);
- buffer = va_arg(ap, char *);
- buflen = va_arg(ap, size_t);
- errnop = va_arg(ap, int *);
- h_errnop = va_arg(ap, int *);
- statp = __res_state();
- if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_UNAVAIL);
- }
- if ((ned = __netent_data_init()) == NULL) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_UNAVAIL);
- }
- if ((buf = malloc(sizeof(*buf))) == NULL) {
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_NOTFOUND);
- }
- *((struct netent **)rval) = NULL;
- strncpy(qbuf, net, sizeof(qbuf) - 1);
- qbuf[sizeof(qbuf) - 1] = '\0';
- anslen = res_nsearch(statp, qbuf, C_IN, T_PTR, (u_char *)buf,
- sizeof(*buf));
- if (anslen < 0) {
- free(buf);
- #ifdef DEBUG
- if (statp->options & RES_DEBUG)
- printf("res_nsearch failed\n");
- #endif
- return (NS_UNAVAIL);
- } else if (anslen > sizeof(*buf)) {
- free(buf);
- #ifdef DEBUG
- if (statp->options & RES_DEBUG)
- printf("res_search static buffer too small\n");
- #endif
- return (NS_UNAVAIL);
- }
- error = getnetanswer(buf, anslen, BYNAME, &ne, ned, statp);
- free(buf);
- if (error != 0) {
- *h_errnop = statp->res_h_errno;
- return (NS_NOTFOUND);
- }
- if (__copy_netent(&ne, nptr, buffer, buflen) != 0) {
- *errnop = errno;
- RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
- *h_errnop = statp->res_h_errno;
- return (NS_RETURN);
- }
- *((struct netent **)rval) = nptr;
- return (NS_SUCCESS);
- }
- void
- _setnetdnsent(int stayopen)
- {
- res_state statp;
- statp = __res_state();
- if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1)
- return;
- if (stayopen)
- statp->options |= RES_STAYOPEN | RES_USEVC;
- }
- void
- _endnetdnsent()
- {
- res_state statp;
- statp = __res_state();
- statp->options &= ~(RES_STAYOPEN | RES_USEVC);
- res_nclose(statp);
- }