diff options
Diffstat (limited to 'newlib/libc/sys/linux/net/res_send.c')
| -rw-r--r-- | newlib/libc/sys/linux/net/res_send.c | 1116 |
1 files changed, 0 insertions, 1116 deletions
diff --git a/newlib/libc/sys/linux/net/res_send.c b/newlib/libc/sys/linux/net/res_send.c deleted file mode 100644 index 5c2bcf746..000000000 --- a/newlib/libc/sys/linux/net/res_send.c +++ /dev/null @@ -1,1116 +0,0 @@ -/* - * Copyright (c) 1985, 1989, 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. - */ - -/* - * Portions Copyright (c) 1996-1999 by Internet Software Consortium. - * - * 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. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS - * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE - * CONSORTIUM 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. - */ - -#if defined(LIBC_SCCS) && !defined(lint) -static const char sccsid[] = "@(#)res_send.c 8.1 (Berkeley) 6/4/93"; -static const char rcsid[] = "$BINDId: res_send.c,v 8.38 2000/03/30 20:16:51 vixie Exp $"; -#endif /* LIBC_SCCS and not lint */ - -#define s6_addr32 __u6_addr.__u6_addr32 -/* - * Send query to name server and wait for reply. - */ - -#include <assert.h> -#include <sys/types.h> -#include <sys/param.h> -#include <sys/time.h> -#include <sys/socket.h> -#include <sys/uio.h> -#include <sys/poll.h> - -#include <netinet/in.h> -#include <arpa/nameser.h> -#include <arpa/inet.h> -#include <sys/ioctl.h> - -#include <errno.h> -#include <fcntl.h> -#include <netdb.h> -#include <resolv.h> -#include <signal.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include "libc-symbols.h" - -#if PACKETSZ > 65536 -#define MAXPACKET PACKETSZ -#else -#define MAXPACKET 65536 -#endif - - -/* From ev_streams.c. */ - -static inline void -__attribute ((always_inline)) -evConsIovec(void *buf, size_t cnt, struct iovec *vec) { - memset(vec, 0xf5, sizeof (*vec)); - vec->iov_base = buf; - vec->iov_len = cnt; -} - -/* From ev_timers.c. */ - -#define BILLION 1000000000 - -static inline void -evConsTime(struct timespec *res, time_t sec, long nsec) { - res->tv_sec = sec; - res->tv_nsec = nsec; -} - -static inline void -evAddTime(struct timespec *res, const struct timespec *addend1, - const struct timespec *addend2) { - res->tv_sec = addend1->tv_sec + addend2->tv_sec; - res->tv_nsec = addend1->tv_nsec + addend2->tv_nsec; - if (res->tv_nsec >= BILLION) { - res->tv_sec++; - res->tv_nsec -= BILLION; - } -} - -static inline void -evSubTime(struct timespec *res, const struct timespec *minuend, - const struct timespec *subtrahend) { - res->tv_sec = minuend->tv_sec - subtrahend->tv_sec; - if (minuend->tv_nsec >= subtrahend->tv_nsec) - res->tv_nsec = minuend->tv_nsec - subtrahend->tv_nsec; - else { - res->tv_nsec = (BILLION - - subtrahend->tv_nsec + minuend->tv_nsec); - res->tv_sec--; - } -} - -static inline int -evCmpTime(struct timespec a, struct timespec b) { - long x = a.tv_sec - b.tv_sec; - - if (x == 0L) - x = a.tv_nsec - b.tv_nsec; - return (x < 0L ? (-1) : x > 0L ? (1) : (0)); -} - -static inline void -evNowTime(struct timespec *res) { - struct timeval now; - - if (gettimeofday(&now, NULL) < 0) - evConsTime(res, 0, 0); - else - TIMEVAL_TO_TIMESPEC (&now, res); -} - - -/* Options. Leave them on. */ -/* #undef DEBUG */ -#include "res_debug.h" - -#define EXT(res) ((res)->_u._ext) - -/* Forward. */ - -static int send_vc(res_state, const u_char *, int, - u_char **, int *, int *, int, u_char **); -static int send_dg(res_state, const u_char *, int, - u_char **, int *, int *, int, - int *, int *, u_char **); -#ifdef DEBUG -static void Aerror(const res_state, FILE *, const char *, int, - const struct sockaddr *); -static void Perror(const res_state, FILE *, const char *, int); -#endif -static int sock_eq(struct sockaddr_in6 *, struct sockaddr_in6 *); - -/* Reachover. */ - -static void convaddr4to6(struct sockaddr_in6 *sa); -void res_pquery(const res_state, const u_char *, int, FILE *); - -/* Public. */ - -/* int - * res_isourserver(ina) - * looks up "ina" in _res.ns_addr_list[] - * returns: - * 0 : not found - * >0 : found - * author: - * paul vixie, 29may94 - */ -int -res_ourserver_p(const res_state statp, const struct sockaddr_in6 *inp) -{ - int ns; - - if (inp->sin6_family == AF_INET) { - struct sockaddr_in *in4p = (struct sockaddr_in *) inp; - in_port_t port = in4p->sin_port; - in_addr_t addr = in4p->sin_addr.s_addr; - - for (ns = 0; ns < MAXNS; ns++) { - const struct sockaddr_in *srv = - (struct sockaddr_in *)EXT(statp).nsaddrs[ns]; - - if ((srv != NULL) && (srv->sin_family == AF_INET) && - (srv->sin_port == port) && - (srv->sin_addr.s_addr == INADDR_ANY || - srv->sin_addr.s_addr == addr)) - return (1); - } - } else if (inp->sin6_family == AF_INET6) { - for (ns = 0; ns < MAXNS; ns++) { - const struct sockaddr_in6 *srv = EXT(statp).nsaddrs[ns]; - if ((srv != NULL) && (srv->sin6_family == AF_INET6) && - (srv->sin6_port == inp->sin6_port) && - !(memcmp(&srv->sin6_addr, &in6addr_any, - sizeof (struct in6_addr)) && - memcmp(&srv->sin6_addr, &inp->sin6_addr, - sizeof (struct in6_addr)))) - return (1); - } - } - return (0); -} - -/* int - * res_nameinquery(name, type, class, buf, eom) - * look for (name,type,class) in the query section of packet (buf,eom) - * requires: - * buf + HFIXEDSZ <= eom - * returns: - * -1 : format error - * 0 : not found - * >0 : found - * author: - * paul vixie, 29may94 - */ -int -res_nameinquery(const char *name, int type, int class, - const u_char *buf, const u_char *eom) -{ - const u_char *cp = buf + HFIXEDSZ; - int qdcount = ntohs(((HEADER*)buf)->qdcount); - - while (qdcount-- > 0) { - char tname[MAXDNAME+1]; - int n, ttype, tclass; - - n = dn_expand(buf, eom, cp, tname, sizeof tname); - if (n < 0) - return (-1); - cp += n; - if (cp + 2 * INT16SZ > eom) - return (-1); - ttype = ns_get16(cp); cp += INT16SZ; - tclass = ns_get16(cp); cp += INT16SZ; - if (ttype == type && tclass == class && - ns_samename(tname, name) == 1) - return (1); - } - return (0); -} -libresolv_hidden_def (res_nameinquery) - -/* int - * res_queriesmatch(buf1, eom1, buf2, eom2) - * is there a 1:1 mapping of (name,type,class) - * in (buf1,eom1) and (buf2,eom2)? - * returns: - * -1 : format error - * 0 : not a 1:1 mapping - * >0 : is a 1:1 mapping - * author: - * paul vixie, 29may94 - */ -int -res_queriesmatch(const u_char *buf1, const u_char *eom1, - const u_char *buf2, const u_char *eom2) -{ - const u_char *cp = buf1 + HFIXEDSZ; - int qdcount = ntohs(((HEADER*)buf1)->qdcount); - - if (buf1 + HFIXEDSZ > eom1 || buf2 + HFIXEDSZ > eom2) - return (-1); - - /* - * Only header section present in replies to - * dynamic update packets. - */ - if ((((HEADER *)buf1)->opcode == ns_o_update) && - (((HEADER *)buf2)->opcode == ns_o_update)) - return (1); - - if (qdcount != ntohs(((HEADER*)buf2)->qdcount)) - return (0); - while (qdcount-- > 0) { - char tname[MAXDNAME+1]; - int n, ttype, tclass; - - n = dn_expand(buf1, eom1, cp, tname, sizeof tname); - if (n < 0) - return (-1); - cp += n; - if (cp + 2 * INT16SZ > eom1) - return (-1); - ttype = ns_get16(cp); cp += INT16SZ; - tclass = ns_get16(cp); cp += INT16SZ; - if (!res_nameinquery(tname, ttype, tclass, buf2, eom2)) - return (0); - } - return (1); -} -libresolv_hidden_def (res_queriesmatch) - -int -__libc_res_nsend(res_state statp, const u_char *buf, int buflen, - u_char *ans, int anssiz, u_char **ansp) -{ - int gotsomewhere, terrno, try, v_circuit, resplen, ns, n; - - if (statp->nscount == 0) { - __set_errno (ESRCH); - return (-1); - } - - if (anssiz < HFIXEDSZ) { - __set_errno (EINVAL); - return (-1); - } - - if ((statp->qhook || statp->rhook) && anssiz < MAXPACKET && ansp) { - u_char *buf = malloc (MAXPACKET); - if (buf == NULL) - return (-1); - memcpy (buf, ans, HFIXEDSZ); - *ansp = buf; - ans = buf; - anssiz = MAXPACKET; - } - - DprintQ((statp->options & RES_DEBUG) || (statp->pfcode & RES_PRF_QUERY), - (stdout, ";; res_send()\n"), buf, buflen); - v_circuit = (statp->options & RES_USEVC) || buflen > PACKETSZ; - gotsomewhere = 0; - terrno = ETIMEDOUT; - - /* - * If the ns_addr_list in the resolver context has changed, then - * invalidate our cached copy and the associated timing data. - */ - if (EXT(statp).nsinit) { - int needclose = 0; - - if (EXT(statp).nscount != statp->nscount) - needclose++; - else - for (ns = 0; ns < MAXNS; ns++) { - unsigned int map = EXT(statp).nsmap[ns]; - if (map < MAXNS - && !sock_eq((struct sockaddr_in6 *) - &statp->nsaddr_list[map], - EXT(statp).nsaddrs[ns])) - { - needclose++; - break; - } - } - if (needclose) - res_nclose(statp); - } - - /* - * Maybe initialize our private copy of the ns_addr_list. - */ - if (EXT(statp).nsinit == 0) { - unsigned char map[MAXNS]; - - memset (map, MAXNS, sizeof (map)); - for (n = 0; n < MAXNS; n++) { - ns = EXT(statp).nsmap[n]; - if (ns < statp->nscount) - map[ns] = n; - else if (ns < MAXNS) { - free(EXT(statp).nsaddrs[n]); - EXT(statp).nsaddrs[n] = NULL; - EXT(statp).nsmap[n] = MAXNS; - } - } - n = statp->nscount; - if (statp->nscount > EXT(statp).nscount) - for (n = EXT(statp).nscount, ns = 0; - n < statp->nscount; n++) { - while (ns < MAXNS - && EXT(statp).nsmap[ns] != MAXNS) - ns++; - if (ns == MAXNS) - break; - EXT(statp).nsmap[ns] = n; - map[n] = ns++; - } - EXT(statp).nscount = n; - for (ns = 0; ns < EXT(statp).nscount; ns++) { - n = map[ns]; - if (EXT(statp).nsaddrs[n] == NULL) - EXT(statp).nsaddrs[n] = - malloc(sizeof (struct sockaddr_in6)); - if (EXT(statp).nsaddrs[n] != NULL) { - memcpy(EXT(statp).nsaddrs[n], - &statp->nsaddr_list[ns], - sizeof (struct sockaddr_in)); - EXT(statp).nssocks[n] = -1; - n++; - } - } - EXT(statp).nsinit = 1; - } - - /* - * Some resolvers want to even out the load on their nameservers. - * Note that RES_BLAST overrides RES_ROTATE. - */ - if ((statp->options & RES_ROTATE) != 0 && - (statp->options & RES_BLAST) == 0) { - struct sockaddr_in6 *ina; - unsigned int map; - - n = 0; - while (n < MAXNS && EXT(statp).nsmap[n] == MAXNS) - n++; - if (n < MAXNS) { - ina = EXT(statp).nsaddrs[n]; - map = EXT(statp).nsmap[n]; - for (;;) { - ns = n + 1; - while (ns < MAXNS - && EXT(statp).nsmap[ns] == MAXNS) - ns++; - if (ns == MAXNS) - break; - EXT(statp).nsaddrs[n] = EXT(statp).nsaddrs[ns]; - EXT(statp).nsmap[n] = EXT(statp).nsmap[ns]; - n = ns; - } - EXT(statp).nsaddrs[n] = ina; - EXT(statp).nsmap[n] = map; - } - } - - /* - * Send request, RETRY times, or until successful. - */ - for (try = 0; try < statp->retry; try++) { - for (ns = 0; ns < MAXNS; ns++) - { - struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns]; - - if (nsap == NULL) - goto next_ns; - same_ns: - if (statp->qhook) { - int done = 0, loops = 0; - - do { - res_sendhookact act; - - struct sockaddr_in *nsap4; - nsap4 = (struct sockaddr_in *) nsap; - act = (*statp->qhook)(&nsap4, &buf, &buflen, - ans, anssiz, &resplen); - nsap = (struct sockaddr_in6 *) nsap4; - switch (act) { - case res_goahead: - done = 1; - break; - case res_nextns: - res_nclose(statp); - goto next_ns; - case res_done: - return (resplen); - case res_modified: - /* give the hook another try */ - if (++loops < 42) /*doug adams*/ - break; - /*FALLTHROUGH*/ - case res_error: - /*FALLTHROUGH*/ - default: - return (-1); - } - } while (!done); - } - -#ifdef DEBUG - char tmpbuf[40]; -#endif - Dprint(statp->options & RES_DEBUG, - (stdout, ";; Querying server (# %d) address = %s\n", - ns + 1, inet_ntop(AF_INET6, &nsap->sin6_addr, - tmpbuf, sizeof (tmpbuf)))); - - if (v_circuit) { - /* Use VC; at most one attempt per server. */ - try = statp->retry; - n = send_vc(statp, buf, buflen, &ans, &anssiz, &terrno, - ns, ansp); - if (n < 0) - return (-1); - if (n == 0) - goto next_ns; - resplen = n; - } else { - /* Use datagrams. */ - n = send_dg(statp, buf, buflen, &ans, &anssiz, &terrno, - ns, &v_circuit, &gotsomewhere, ansp); - if (n < 0) - return (-1); - if (n == 0) - goto next_ns; - if (v_circuit) - goto same_ns; - resplen = n; - } - - Dprint((statp->options & RES_DEBUG) || - ((statp->pfcode & RES_PRF_REPLY) && - (statp->pfcode & RES_PRF_HEAD1)), - (stdout, ";; got answer:\n")); - - DprintQ((statp->options & RES_DEBUG) || - (statp->pfcode & RES_PRF_REPLY), - (stdout, "%s", ""), - ans, (resplen > anssiz) ? anssiz : resplen); - - /* - * If we have temporarily opened a virtual circuit, - * or if we haven't been asked to keep a socket open, - * close the socket. - */ - if ((v_circuit && (statp->options & RES_USEVC) == 0) || - (statp->options & RES_STAYOPEN) == 0) { - res_nclose(statp); - } - if (statp->rhook) { - int done = 0, loops = 0; - - do { - res_sendhookact act; - - act = (*statp->rhook)((struct sockaddr_in *) - nsap, buf, buflen, - ans, anssiz, &resplen); - switch (act) { - case res_goahead: - case res_done: - done = 1; - break; - case res_nextns: - res_nclose(statp); - goto next_ns; - case res_modified: - /* give the hook another try */ - if (++loops < 42) /*doug adams*/ - break; - /*FALLTHROUGH*/ - case res_error: - /*FALLTHROUGH*/ - default: - return (-1); - } - } while (!done); - - } - return (resplen); - next_ns: ; - } /*foreach ns*/ - } /*foreach retry*/ - res_nclose(statp); - if (!v_circuit) { - if (!gotsomewhere) - __set_errno (ECONNREFUSED); /* no nameservers found */ - else - __set_errno (ETIMEDOUT); /* no answer obtained */ - } else - __set_errno (terrno); - return (-1); -} - -int -res_nsend(res_state statp, - const u_char *buf, int buflen, u_char *ans, int anssiz) -{ - return __libc_res_nsend(statp, buf, buflen, ans, anssiz, NULL); -} -libresolv_hidden_def (res_nsend) - -/* Private */ - -static int -send_vc(res_state statp, - const u_char *buf, int buflen, u_char **ansp, int *anssizp, - int *terrno, int ns, u_char **anscp) -{ - const HEADER *hp = (HEADER *) buf; - u_char *ans = *ansp; - int anssiz = *anssizp; - HEADER *anhp = (HEADER *) ans; - struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns]; - int truncating, connreset, resplen, n; - struct iovec iov[2]; - u_short len; - u_char *cp; - - connreset = 0; - same_ns: - truncating = 0; - - /* Are we still talking to whom we want to talk to? */ - if (statp->_vcsock >= 0 && (statp->_flags & RES_F_VC) != 0) { - struct sockaddr_in6 peer; - int size = sizeof peer; - - if (getpeername(statp->_vcsock, - (struct sockaddr *)&peer, &size) < 0 || - !sock_eq(&peer, nsap)) { - res_nclose(statp); - statp->_flags &= ~RES_F_VC; - } - } - - if (statp->_vcsock < 0 || (statp->_flags & RES_F_VC) == 0) { - if (statp->_vcsock >= 0) - res_nclose(statp); - - statp->_vcsock = socket(nsap->sin6_family, SOCK_STREAM, 0); - if (statp->_vcsock < 0) { - *terrno = errno; - Perror(statp, stderr, "socket(vc)", errno); - return (-1); - } - __set_errno (0); - if (connect(statp->_vcsock, (struct sockaddr *)nsap, - sizeof *nsap) < 0) { - *terrno = errno; - Aerror(statp, stderr, "connect/vc", errno, - (struct sockaddr *) nsap); - res_nclose(statp); - return (0); - } - statp->_flags |= RES_F_VC; - } - - /* - * Send length & message - */ - putshort((u_short)buflen, (u_char*)&len); - evConsIovec(&len, INT16SZ, &iov[0]); - evConsIovec((void*)buf, buflen, &iov[1]); - if (TEMP_FAILURE_RETRY (writev(statp->_vcsock, iov, 2)) - != (INT16SZ + buflen)) { - *terrno = errno; - Perror(statp, stderr, "write failed", errno); - res_nclose(statp); - return (0); - } - /* - * Receive length & response - */ - read_len: - cp = ans; - len = INT16SZ; - while ((n = TEMP_FAILURE_RETRY (read(statp->_vcsock, (char *)cp, - (int)len))) > 0) { - cp += n; - if ((len -= n) <= 0) - break; - } - if (n <= 0) { - *terrno = errno; - Perror(statp, stderr, "read failed", errno); - res_nclose(statp); - /* - * A long running process might get its TCP - * connection reset if the remote server was - * restarted. Requery the server instead of - * trying a new one. When there is only one - * server, this means that a query might work - * instead of failing. We only allow one reset - * per query to prevent looping. - */ - if (*terrno == ECONNRESET && !connreset) { - connreset = 1; - res_nclose(statp); - goto same_ns; - } - res_nclose(statp); - return (0); - } - resplen = ns_get16(ans); - if (resplen > anssiz) { - if (anscp) { - ans = malloc (MAXPACKET); - if (ans == NULL) { - *terrno = ENOMEM; - res_nclose(statp); - return (0); - } - anssiz = MAXPACKET; - *anssizp = MAXPACKET; - *ansp = ans; - *anscp = ans; - anhp = (HEADER *) ans; - len = resplen; - } else { - Dprint(statp->options & RES_DEBUG, - (stdout, ";; response truncated\n") - ); - truncating = 1; - len = anssiz; - } - } else - len = resplen; - if (len < HFIXEDSZ) { - /* - * Undersized message. - */ - Dprint(statp->options & RES_DEBUG, - (stdout, ";; undersized: %d\n", len)); - *terrno = EMSGSIZE; - res_nclose(statp); - return (0); - } - cp = ans; - while (len != 0 && (n = read(statp->_vcsock, (char *)cp, (int)len)) > 0){ - cp += n; - len -= n; - } - if (n <= 0) { - *terrno = errno; - Perror(statp, stderr, "read(vc)", errno); - res_nclose(statp); - return (0); - } - if (truncating) { - /* - * Flush rest of answer so connection stays in synch. - */ - anhp->tc = 1; - len = resplen - anssiz; - while (len != 0) { - char junk[PACKETSZ]; - - n = read(statp->_vcsock, junk, - (len > sizeof junk) ? sizeof junk : len); - if (n > 0) - len -= n; - else - break; - } - } - /* - * If the calling applicating has bailed out of - * a previous call and failed to arrange to have - * the circuit closed or the server has got - * itself confused, then drop the packet and - * wait for the correct one. - */ - if (hp->id != anhp->id) { - DprintQ((statp->options & RES_DEBUG) || - (statp->pfcode & RES_PRF_REPLY), - (stdout, ";; old answer (unexpected):\n"), - ans, (resplen > anssiz) ? anssiz: resplen); - goto read_len; - } - - /* - * All is well, or the error is fatal. Signal that the - * next nameserver ought not be tried. - */ - return (resplen); -} - -static int -send_dg(res_state statp, - const u_char *buf, int buflen, u_char **ansp, int *anssizp, - int *terrno, int ns, int *v_circuit, int *gotsomewhere, u_char **anscp) -{ - const HEADER *hp = (HEADER *) buf; - u_char *ans = *ansp; - int anssiz = *anssizp; - HEADER *anhp = (HEADER *) ans; - struct sockaddr_in6 *nsap = EXT(statp).nsaddrs[ns]; - struct timespec now, timeout, finish; - struct pollfd pfd[1]; - int ptimeout; - struct sockaddr_in6 from; - static int socket_pf = 0; - int fromlen, resplen, seconds, n; - - if (EXT(statp).nssocks[ns] == -1) { - /* only try IPv6 if IPv6 NS and if not failed before */ - if ((EXT(statp).nscount6 > 0) && (socket_pf != PF_INET)) { - EXT(statp).nssocks[ns] = - socket(PF_INET6, SOCK_DGRAM, 0); - socket_pf = EXT(statp).nssocks[ns] < 0 ? PF_INET - : PF_INET6; - } - if (EXT(statp).nssocks[ns] < 0) - EXT(statp).nssocks[ns] = socket(PF_INET, SOCK_DGRAM, 0); - if (EXT(statp).nssocks[ns] < 0) { - *terrno = errno; - Perror(statp, stderr, "socket(dg)", errno); - return (-1); - } - /* If IPv6 socket and nsap is IPv4, make it IPv4-mapped */ - if ((socket_pf == PF_INET6) && (nsap->sin6_family == AF_INET)) - convaddr4to6(nsap); - /* - * On a 4.3BSD+ machine (client and server, - * actually), sending to a nameserver datagram - * port with no nameserver will cause an - * ICMP port unreachable message to be returned. - * If our datagram socket is "connected" to the - * server, we get an ECONNREFUSED error on the next - * socket operation, and select returns if the - * error message is received. We can thus detect - * the absence of a nameserver without timing out. - */ - if (connect(EXT(statp).nssocks[ns], (struct sockaddr *)nsap, - sizeof *nsap) < 0) { - Aerror(statp, stderr, "connect(dg)", errno, - (struct sockaddr *) nsap); - res_nclose(statp); - return (0); - } - /* Make socket non-blocking. */ - int fl = fcntl (EXT(statp).nssocks[ns], F_GETFL); - if (fl != -1) - fcntl (EXT(statp).nssocks[ns], F_SETFL, - fl | O_NONBLOCK); - Dprint(statp->options & RES_DEBUG, - (stdout, ";; new DG socket\n")) - } - - /* - * Compute time for the total operation. - */ - seconds = (statp->retrans << ns); - if (ns > 0) - seconds /= statp->nscount; - if (seconds <= 0) - seconds = 1; - evNowTime(&now); - evConsTime(&timeout, seconds, 0); - evAddTime(&finish, &now, &timeout); - int need_recompute = 0; - int nwritten = 0; - pfd[0].fd = EXT(statp).nssocks[ns]; - pfd[0].events = POLLOUT; - wait: - if (need_recompute) { - evNowTime(&now); - if (evCmpTime(finish, now) <= 0) { - Perror(statp, stderr, "select", errno); - res_nclose(statp); - return (0); - } - evSubTime(&timeout, &finish, &now); - } - /* Convert struct timespec in milliseconds. */ - ptimeout = timeout.tv_sec * 1000 + timeout.tv_nsec / 1000000; - - n = 0; - if (nwritten == 0) - n = poll (pfd, 1, 0); - if (__builtin_expect (n == 0, 0)) { - n = poll (pfd, 1, ptimeout); - need_recompute = 1; - } - if (n == 0) { - Dprint(statp->options & RES_DEBUG, (stdout, - ";; timeout sending\n")); - *gotsomewhere = 1; - return (0); - } - if (n < 0) { - if (errno == EINTR) { - recompute_resend: - evNowTime(&now); - if (evCmpTime(finish, now) > 0) { - evSubTime(&timeout, &finish, &now); - goto wait; - } - } - Perror(statp, stderr, "poll", errno); - res_nclose(statp); - return (0); - } - __set_errno (0); - if (pfd[0].revents & POLLOUT) { - if (send(pfd[0].fd, (char*)buf, buflen, 0) != buflen) { - if (errno == EINTR || errno == EAGAIN) - goto recompute_resend; - Perror(statp, stderr, "send", errno); - res_nclose(statp); - return (0); - } - pfd[0].events = POLLIN; - ++nwritten; - goto wait; - } else if (pfd[0].revents & POLLIN) { - fromlen = sizeof(struct sockaddr_in6); - if (anssiz < MAXPACKET - && anscp - && (ioctl (pfd[0].fd, FIONREAD, &resplen) < 0 - || anssiz < resplen)) { - ans = malloc (MAXPACKET); - if (ans == NULL) - ans = *ansp; - else { - anssiz = MAXPACKET; - *anssizp = MAXPACKET; - *ansp = ans; - *anscp = ans; - anhp = (HEADER *) ans; - } - } - resplen = recvfrom(pfd[0].fd, (char*)ans, anssiz,0, - (struct sockaddr *)&from, &fromlen); - if (resplen <= 0) { - if (errno == EINTR || errno == EAGAIN) { - need_recompute = 1; - goto wait; - } - Perror(statp, stderr, "recvfrom", errno); - res_nclose(statp); - return (0); - } - *gotsomewhere = 1; - if (resplen < HFIXEDSZ) { - /* - * Undersized message. - */ - Dprint(statp->options & RES_DEBUG, - (stdout, ";; undersized: %d\n", - resplen)); - *terrno = EMSGSIZE; - res_nclose(statp); - return (0); - } - if (hp->id != anhp->id) { - /* - * response from old query, ignore it. - * XXX - potential security hazard could - * be detected here. - */ - DprintQ((statp->options & RES_DEBUG) || - (statp->pfcode & RES_PRF_REPLY), - (stdout, ";; old answer:\n"), - ans, (resplen > anssiz) ? anssiz : resplen); - goto wait; - } - if (!(statp->options & RES_INSECURE1) && - !res_ourserver_p(statp, &from)) { - /* - * response from wrong server? ignore it. - * XXX - potential security hazard could - * be detected here. - */ - DprintQ((statp->options & RES_DEBUG) || - (statp->pfcode & RES_PRF_REPLY), - (stdout, ";; not our server:\n"), - ans, (resplen > anssiz) ? anssiz : resplen); - goto wait; - } - if (!(statp->options & RES_INSECURE2) && - !res_queriesmatch(buf, buf + buflen, - ans, ans + anssiz)) { - /* - * response contains wrong query? ignore it. - * XXX - potential security hazard could - * be detected here. - */ - DprintQ((statp->options & RES_DEBUG) || - (statp->pfcode & RES_PRF_REPLY), - (stdout, ";; wrong query name:\n"), - ans, (resplen > anssiz) ? anssiz : resplen); - goto wait; - } - if (anhp->rcode == SERVFAIL || - anhp->rcode == NOTIMP || - anhp->rcode == REFUSED) { - DprintQ(statp->options & RES_DEBUG, - (stdout, "server rejected query:\n"), - ans, (resplen > anssiz) ? anssiz : resplen); - res_nclose(statp); - /* don't retry if called from dig */ - if (!statp->pfcode) - return (0); - } - if (!(statp->options & RES_IGNTC) && anhp->tc) { - /* - * To get the rest of answer, - * use TCP with same server. - */ - Dprint(statp->options & RES_DEBUG, - (stdout, ";; truncated answer\n")); - *v_circuit = 1; - res_nclose(statp); - return (1); - } - /* - * All is well, or the error is fatal. Signal that the - * next nameserver ought not be tried. - */ - return (resplen); - } else if (pfd[0].revents & (POLLERR | POLLHUP | POLLNVAL)) { - /* Something went wrong. We can stop trying. */ - res_nclose(statp); - return (0); - } -} - -#ifdef DEBUG -static void -Aerror(const res_state statp, FILE *file, const char *string, int error, - const struct sockaddr *address) -{ - int save = errno; - - if ((statp->options & RES_DEBUG) != 0) { - char tmp[sizeof "xxxx.xxxx.xxxx.255.255.255.255"]; - - fprintf(file, "res_send: %s ([%s].%u): %s\n", - string, - inet_ntop(address->sa_family, address->sa_data, - tmp, sizeof tmp), - (address->sa_family == AF_INET - ? ntohs(((struct sockaddr_in *) address)->sin_port) - : address->sa_family == AF_INET6 - ? ntohs(((struct sockaddr_in6 *) address)->sin6_port) - : 0), - strerror(error)); - } - __set_errno (save); -} - -static void -Perror(const res_state statp, FILE *file, const char *string, int error) { - int save = errno; - - if ((statp->options & RES_DEBUG) != 0) - fprintf(file, "res_send: %s: %s\n", - string, strerror(error)); - __set_errno (save); -} -#endif - -static int -sock_eq(struct sockaddr_in6 *a1, struct sockaddr_in6 *a2) { - if (a1->sin6_family == a2->sin6_family) { - if (a1->sin6_family == AF_INET) - return ((((struct sockaddr_in *)a1)->sin_port == - ((struct sockaddr_in *)a2)->sin_port) && - (((struct sockaddr_in *)a1)->sin_addr.s_addr == - ((struct sockaddr_in *)a2)->sin_addr.s_addr)); - else - return ((a1->sin6_port == a2->sin6_port) && - !memcmp(&a1->sin6_addr, &a2->sin6_addr, - sizeof (struct in6_addr))); - } - if (a1->sin6_family == AF_INET) { - struct sockaddr_in6 *sap = a1; - a1 = a2; - a2 = sap; - } /* assumes that AF_INET and AF_INET6 are the only possibilities */ - return ((a1->sin6_port == ((struct sockaddr_in *)a2)->sin_port) && - IN6_IS_ADDR_V4MAPPED(&a1->sin6_addr) && - (a1->sin6_addr.s6_addr32[3] == - ((struct sockaddr_in *)a2)->sin_addr.s_addr)); -} - -/* - * Converts IPv4 family, address and port to - * IPv6 family, IPv4-mapped IPv6 address and port. - */ -static void -convaddr4to6(struct sockaddr_in6 *sa) -{ - struct sockaddr_in *sa4p = (struct sockaddr_in *) sa; - in_port_t port = sa4p->sin_port; - in_addr_t addr = sa4p->sin_addr.s_addr; - - sa->sin6_family = AF_INET6; - sa->sin6_port = port; - sa->sin6_addr.s6_addr32[0] = 0; - sa->sin6_addr.s6_addr32[1] = 0; - sa->sin6_addr.s6_addr32[2] = htonl(0xFFFF); - sa->sin6_addr.s6_addr32[3] = addr; -} |