diff options
Diffstat (limited to 'resolv/nss_dns/dns-host.c')
| -rw-r--r-- | resolv/nss_dns/dns-host.c | 84 |
1 files changed, 56 insertions, 28 deletions
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c index 483e791801..e99d964203 100644 --- a/resolv/nss_dns/dns-host.c +++ b/resolv/nss_dns/dns-host.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. +/* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Extended from original form by Ulrich Drepper <drepper@cygnus.com>, 1996. @@ -114,15 +114,16 @@ typedef union querybuf /* These functions are defined in res_comp.c. */ #define NS_MAXCDNAME 255 /* maximum compressed domain name */ -extern int __ns_name_ntop __P ((const u_char *, char *, size_t)); -extern int __ns_name_unpack __P ((const u_char *, const u_char *, - const u_char *, u_char *, size_t)); +extern int __ns_name_ntop (const u_char *, char *, size_t); +extern int __ns_name_unpack (const u_char *, const u_char *, + const u_char *, u_char *, size_t); static enum nss_status getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, struct hostent *result, char *buffer, - size_t buflen, int *errnop, int *h_errnop); + size_t buflen, int *errnop, int *h_errnop, + int map); enum nss_status _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result, @@ -132,6 +133,7 @@ _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result, querybuf host_buffer; int size, type, n; const char *cp; + int map = 0; if ((_res.options & RES_INIT) == 0 && __res_ninit (&_res) == -1) return NSS_STATUS_UNAVAIL; @@ -166,13 +168,29 @@ _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result, sizeof (host_buffer.buf)); if (n < 0) { + enum nss_status status = (errno == ECONNREFUSED + ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND); *h_errnop = h_errno; - *errnop = *h_errnop == TRY_AGAIN ? EAGAIN : ENOENT; - return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND; + *errnop = h_errno == TRY_AGAIN ? EAGAIN : ENOENT; + + /* If we are looking for a IPv6 address and mapping is enabled + by having the RES_USE_INET6 bit in _res.options set, we try + another lookup. */ + if (af == AF_INET6 && (_res.options & RES_USE_INET6)) + n = res_nsearch (&_res, name, C_IN, T_A, host_buffer.buf, + sizeof (host_buffer.buf)); + + if (n < 0) + return status; + + map = 1; + + result->h_addrtype = AF_INET; + result->h_length = INADDRSZ;; } return getanswer_r (&host_buffer, n, name, type, result, buffer, buflen, - errnop, h_errnop); + errnop, h_errnop, map); } @@ -276,7 +294,7 @@ _nss_dns_gethostbyaddr_r (const char *addr, size_t len, int af, } status = getanswer_r (&host_buffer, n, qbuf, T_PTR, result, buffer, buflen, - errnop, h_errnop); + errnop, h_errnop, 0 /* XXX */); if (status != NSS_STATUS_SUCCESS) { *h_errnop = h_errno; @@ -294,6 +312,9 @@ _nss_dns_gethostbyaddr_r (const char *addr, size_t len, int af, memcpy (host_data->host_addr, addr, len); host_data->h_addr_ptrs[0] = (char *) host_data->host_addr; host_data->h_addr_ptrs[1] = NULL; +#if 0 + /* XXX I think this is wrong. Why should an IPv4 address be + converted to IPv6 if the user explicitly asked for IPv4? */ if (af == AF_INET && (_res.options & RES_USE_INET6)) { map_v4v6_address ((char *) host_data->host_addr, @@ -301,6 +322,7 @@ _nss_dns_gethostbyaddr_r (const char *addr, size_t len, int af, result->h_addrtype = AF_INET6; result->h_length = IN6ADDRSZ; } +#endif *h_errnop = NETDB_SUCCESS; return NSS_STATUS_SUCCESS; } @@ -309,7 +331,7 @@ _nss_dns_gethostbyaddr_r (const char *addr, size_t len, int af, static enum nss_status getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, struct hostent *result, char *buffer, size_t buflen, - int *errnop, int *h_errnop) + int *errnop, int *h_errnop, int map) { struct host_data { @@ -326,10 +348,11 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, char *bp, **ap, **hap; char tbuf[MAXDNAME]; const char *tname; - int (*name_ok) __P ((const char *)); + int (*name_ok) (const char *); u_char packtmp[NS_MAXCDNAME]; + int have_to_map = 0; - if (linebuflen < 0) + if (__builtin_expect (linebuflen, 0) < 0) { /* The buffer is too small. */ too_small: @@ -363,7 +386,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, ancount = ntohs (hp->ancount); qdcount = ntohs (hp->qdcount); cp = answer->buf + HFIXEDSZ; - if (qdcount != 1) + if (__builtin_expect (qdcount, 1) != 1) { *h_errnop = NO_RECOVERY; *errnop = ENOENT; @@ -374,7 +397,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, packtmp, sizeof packtmp); if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) { - if (errno == EMSGSIZE) + if (__builtin_expect (errno, 0) == EMSGSIZE) goto too_small; n = -1; @@ -430,7 +453,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, packtmp, sizeof packtmp); if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) { - if (errno == EMSGSIZE) + if (__builtin_expect (errno, 0) == EMSGSIZE) goto too_small; n = -1; @@ -469,7 +492,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, /* Store alias. */ *ap++ = bp; n = strlen (bp) + 1; /* For the \0. */ - if (n >= MAXHOSTNAMELEN) + if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) { ++had_error; continue; @@ -478,9 +501,9 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, linebuflen -= n; /* Get canonical name. */ n = strlen (tbuf) + 1; /* For the \0. */ - if (n > linebuflen) + if (__builtin_expect (n > linebuflen, 0)) goto too_small; - if (n >= MAXHOSTNAMELEN) + if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) { ++had_error; continue; @@ -502,9 +525,9 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, cp += n; /* Get canonical name. */ n = strlen (tbuf) + 1; /* For the \0. */ - if (n > linebuflen) + if (__builtin_expect (n > linebuflen, 0)) goto too_small; - if (n >= MAXHOSTNAMELEN) + if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) { ++had_error; continue; @@ -514,7 +537,9 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, linebuflen -= n; continue; } - if (type == T_SIG || type == T_KEY || type == T_NXT) + if (__builtin_expect (type == T_SIG, 0) + || __builtin_expect (type == T_KEY, 0) + || __builtin_expect (type == T_NXT, 0)) { /* We don't support DNSSEC yet. For now, ignore the record and send a low priority message to syslog. */ @@ -524,7 +549,10 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, cp += n; continue; } - if (type != qtype) + + if (type == T_A && qtype == T_AAAA && map) + have_to_map = 1; + else if (__builtin_expect (type != qtype, 0)) { syslog (LOG_NOTICE | LOG_AUTH, "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"", @@ -547,7 +575,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, packtmp, sizeof packtmp); if (n != -1 && __ns_name_ntop (packtmp, bp, linebuflen) == -1) { - if (errno == EMSGSIZE) + if (__builtin_expect (errno, 0) == EMSGSIZE) goto too_small; n = -1; @@ -569,7 +597,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, if (n != -1) { n = strlen (bp) + 1; /* for the \0 */ - if (n >= MAXHOSTNAMELEN) + if (__builtin_expect (n, 0) >= MAXHOSTNAMELEN) { ++had_error; break; @@ -580,7 +608,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, break; #else result->h_name = bp; - if (_res.options & RES_USE_INET6) + if (have_to_map) { n = strlen (bp) + 1; /* for the \0 */ if (n >= MAXHOSTNAMELEN) @@ -597,7 +625,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, #endif case T_A: case T_AAAA: - if (strcasecmp (result->h_name, bp) != 0) + if (__builtin_expect (strcasecmp (result->h_name, bp), 0) != 0) { syslog (LOG_NOTICE | LOG_AUTH, AskedForGot, result->h_name, bp); cp += n; @@ -621,7 +649,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, linebuflen -= sizeof (align) - ((u_long) bp % sizeof (align)); bp += sizeof (align) - ((u_long) bp % sizeof (align)); - if (n > linebuflen) + if (__builtin_expect (n > linebuflen, 0)) goto too_small; if (hap >= &host_data->h_addr_ptrs[MAX_NR_ADDRS-1]) { @@ -665,7 +693,7 @@ getanswer_r (const querybuf *answer, int anslen, const char *qname, int qtype, linebuflen -= n; } - if (_res.options & RES_USE_INET6) + if (have_to_map) map_v4v6_hostent (result, &bp, &linebuflen); *h_errnop = NETDB_SUCCESS; return NSS_STATUS_SUCCESS; |