diff options
Diffstat (limited to 'lib/libc/asr/res_mkquery.c')
| -rw-r--r-- | lib/libc/asr/res_mkquery.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/lib/libc/asr/res_mkquery.c b/lib/libc/asr/res_mkquery.c new file mode 100644 index 00000000000..dedf558cb48 --- /dev/null +++ b/lib/libc/asr/res_mkquery.c @@ -0,0 +1,104 @@ +/* $OpenBSD: res_mkquery.c,v 1.1 2012/09/08 11:08:21 eric Exp $ */ +/* + * Copyright (c) 2012 Eric Faurot <eric@openbsd.org> + * + * 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 THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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. + */ + +#include <sys/types.h> +#include <netinet/in.h> + +#include <arpa/nameser.h> /* for MAXDNAME */ +#include <errno.h> +#include <resolv.h> +#include <string.h> + +#include "asr.h" +#include "asr_private.h" + +/* This function is apparently needed by some ports. */ +int +res_mkquery(int op, const char *dname, int class, int type, + const unsigned char *data, int datalen, const unsigned char *newrr, + unsigned char *buf, int buflen) +{ + struct asr_ctx *ac; + struct packed p; + struct header h; + char fqdn[MAXDNAME]; + char dn[MAXDNAME]; + + /* we currently only support QUERY */ + if (op != QUERY || data) + return (-1); + + if (dname[0] == '\0' || dname[strlen(dname) - 1] != '.') { + strlcpy(fqdn, dname, sizeof fqdn); + if (strlcat(fqdn, ".", sizeof fqdn) >= sizeof fqdn) + return (-1); + dname = fqdn; + } + + if (dname_from_fqdn(dname, dn, sizeof(dn)) == -1) + return (-1); + + ac = asr_use_resolver(NULL); + + memset(&h, 0, sizeof h); + h.id = res_randomid(); + if (ac->ac_options & RES_RECURSE) + h.flags |= RD_MASK; + h.qdcount = 1; + + packed_init(&p, buf, buflen); + pack_header(&p, &h); + pack_query(&p, type, class, dn); + + asr_ctx_unref(ac); + + if (p.err) + return (-1); + + return (p.offset); +} + +/* + * This function is not documented, but used by sendmail. + * Put here because it uses asr_private.h too. + */ +int +res_querydomain(const char *name, + const char *domain, + int class, + int type, + u_char *answer, + int anslen) +{ + char fqdn[MAXDNAME], ndom[MAXDNAME]; + size_t n; + + /* we really want domain to end with a dot for now */ + if (domain && ((n = strlen(domain)) == 0 || domain[n - 1 ] != '.')) { + domain = ndom; + strlcpy(ndom, domain, sizeof ndom); + strlcat(ndom, ".", sizeof ndom); + } + + if (asr_make_fqdn(name, domain, fqdn, sizeof fqdn) == 0) { + h_errno = NO_RECOVERY; + errno = EINVAL; + return (-1); + } + + return (res_query(fqdn, class, type, answer, anslen)); +} |