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5e7ac031f5
* dirmngr/dns-stuff.c (resolve_name_standard): On failure retry by first resolving the CNAME. (get_dns_cname): New. * dirmngr/t-dns-stuff.c (main): Add option --cname. -- At least the getaddrinfo implementation in glibc 2.19-13 from Debian returns EAI_NONAME if the CNAME points to a too long list of A/AAAA addresses. Looking at the wire the data is correctly returned from the server but getaddrinfo seems to get confused by truncation and retry. To fix this we resolve the CNAME again and call getaddrinfo again with the canonical name. Signed-off-by: Werner Koch <wk@gnupg.org>
127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/* dns-stuff.c - DNS related code including CERT RR (rfc-4398)
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* Copyright (C) 2006 Free Software Foundation, Inc.
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* Copyright (C) 2006, 2015 Werner Koch
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GNUPG_DIRMNGR_DNS_STUFF_H
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#define GNUPG_DIRMNGR_DNS_STUFF_H
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#ifdef HAVE_W32_SYSTEM
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# ifdef HAVE_WINSOCK2_H
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# include <winsock2.h>
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# endif
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# include <windows.h>
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#else
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# include <sys/types.h>
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# include <sys/socket.h>
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#endif
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/*
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* Flags used with resolve_dns_addr.
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*/
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#define DNS_NUMERICHOST 1 /* Force numeric output format. */
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#define DNS_WITHBRACKET 2 /* Put brackets around numeric v6
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addresses. */
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/*
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* Constants for use with get_dns_cert.
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*/
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#define DNS_CERTTYPE_ANY 0 /* Internal catch all type. */
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/* Certificate types according to RFC-4398: */
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#define DNS_CERTTYPE_PKIX 1 /* X.509 as per PKIX. */
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#define DNS_CERTTYPE_SPKI 2 /* SPKI certificate. */
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#define DNS_CERTTYPE_PGP 3 /* OpenPGP packet. */
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#define DNS_CERTTYPE_IPKIX 4 /* The URL of an X.509 data object. */
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#define DNS_CERTTYPE_ISPKI 5 /* The URL of an SPKI certificate. */
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#define DNS_CERTTYPE_IPGP 6 /* The fingerprint
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and URL of an OpenPGP packet. */
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#define DNS_CERTTYPE_ACPKIX 7 /* Attribute Certificate. */
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#define DNS_CERTTYPE_IACPKIX 8 /* The URL of an Attribute Certificate. */
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#define DNS_CERTTYPE_URI 253 /* URI private. */
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#define DNS_CERTTYPE_OID 254 /* OID private. */
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/* Hacks for our implementation. */
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#define DNS_CERTTYPE_RRBASE 1024 /* Base of special constants. */
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#define DNS_CERTTYPE_RR61 (DNS_CERTTYPE_RRBASE + 61)
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struct dns_addrinfo_s;
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typedef struct dns_addrinfo_s *dns_addrinfo_t;
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struct dns_addrinfo_s
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{
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dns_addrinfo_t next;
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int family;
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int socktype;
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int protocol;
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int addrlen;
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struct sockaddr addr[1];
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};
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struct srventry
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{
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unsigned short priority;
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unsigned short weight;
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unsigned short port;
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int run_count;
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char target[1025];
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};
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/* Calling this function switches the DNS code into Tor mode if
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possibe. Return 0 on success. */
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gpg_error_t enable_dns_tormode (void);
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void free_dns_addrinfo (dns_addrinfo_t ai);
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/* Function similar to getaddrinfo. */
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gpg_error_t resolve_dns_name (const char *name, unsigned short port,
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int want_family, int want_socktype,
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dns_addrinfo_t *r_dai, char **r_canonname);
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/* Function similar to getnameinfo. */
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gpg_error_t resolve_dns_addr (const struct sockaddr *addr, int addrlen,
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unsigned int flags, char **r_name);
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/* Return true if NAME is a numerical IP address. */
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int is_ip_address (const char *name);
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/* Get the canonical name for NAME. */
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gpg_error_t get_dns_cname (const char *name, char **r_cname);
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/* Return a CERT record or an arbitray RR. */
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gpg_error_t get_dns_cert (const char *name, int want_certtype,
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void **r_key, size_t *r_keylen,
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unsigned char **r_fpr, size_t *r_fprlen,
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char **r_url);
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int getsrv (const char *name,struct srventry **list);
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#endif /*GNUPG_DIRMNGR_DNS_STUFF_H*/
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