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/*++
/* NAME
/* dns_rr_eq_sa 3
/* SUMMARY
/* compare resource record with socket address
/* SYNOPSIS
/* #include <dns.h>
/*
/* int dns_rr_eq_sa(DNS_RR *rr, struct sockaddr *sa)
/* DNS_RR *rr;
/* struct sockaddr *sa;
/*
/* int DNS_RR_EQ_SA(DNS_RR *rr, struct sockaddr *sa)
/* DNS_RR *rr;
/* struct sockaddr *sa;
/* DESCRIPTION
/* dns_rr_eq_sa() compares a DNS resource record with a socket
/* address. The result is non-zero when the resource type
/* matches the socket address family, and when the network
/* address information is identical.
/*
/* DNS_RR_EQ_SA() is an unsafe macro version for those who live fast.
/*
/* Arguments:
/* .IP rr
/* DNS resource record pointer.
/* .IP sa
/* Binary address pointer.
/* DIAGNOSTICS
/* Panic: unknown socket address family.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System libraries. */
#include <sys_defs.h>
/* Utility library. */
#include <msg.h>
#include <sock_addr.h>
/* DNS library. */
#include <dns.h>
/* dns_rr_eq_sa - compare resource record with socket address */
int dns_rr_eq_sa(DNS_RR *rr, struct sockaddr *sa)
{
const char *myname = "dns_rr_eq_sa";
if (sa->sa_family == AF_INET) {
return (rr->type == T_A
&& SOCK_ADDR_IN_ADDR(sa).s_addr == IN_ADDR(rr->data).s_addr);
#ifdef HAS_IPV6
} else if (sa->sa_family == AF_INET6) {
return (rr->type == T_AAAA
&& memcmp((void *) &SOCK_ADDR_IN6_ADDR(sa),
rr->data, rr->data_len) == 0);
#endif
} else {
msg_panic("%s: unsupported socket address family type: %d",
myname, sa->sa_family);
}
}
/*
* Stand-alone test program.
*/
#ifdef TEST
#include <stdlib.h>
#include <vstream.h>
#include <myaddrinfo.h>
#include <inet_proto.h>
#include <mymalloc.h>
static const char *myname;
static NORETURN usage(void)
{
msg_fatal("usage: %s hostname address", myname);
}
static int compare_family(const void *a, const void *b)
{
struct addrinfo *resa = *(struct addrinfo **) a;
struct addrinfo *resb = *(struct addrinfo **) b;
return (resa->ai_family - resb->ai_family);
}
int main(int argc, char **argv)
{
MAI_HOSTADDR_STR hostaddr;
DNS_RR *rr;
struct addrinfo *res0;
struct addrinfo *res1;
struct addrinfo *res;
struct addrinfo **resv;
size_t len, n;
int aierr;
myname = argv[0];
if (argc < 3)
usage();
inet_proto_init(argv[0], INET_PROTO_NAME_ALL);
while (*++argv) {
if (argv[1] == 0)
usage();
if ((aierr = hostaddr_to_sockaddr(argv[1], (char *) 0, 0, &res1)) != 0)
msg_fatal("host address %s: %s", argv[1], MAI_STRERROR(aierr));
if ((rr = dns_sa_to_rr(argv[1], DNS_RR_NOPREF, res1->ai_addr)) == 0)
msg_fatal("dns_sa_to_rr: %m");
freeaddrinfo(res1);
if ((aierr = hostname_to_sockaddr(argv[0], (char *) 0, 0, &res0)) != 0)
msg_fatal("host name %s: %s", argv[0], MAI_STRERROR(aierr));
for (len = 0, res = res0; res != 0; res = res->ai_next)
len += 1;
resv = (struct addrinfo **) mymalloc(len * sizeof(*resv));
for (len = 0, res = res0; res != 0; res = res->ai_next)
resv[len++] = res;
qsort((void *) resv, len, sizeof(*resv), compare_family);
for (n = 0; n < len; n++) {
SOCKADDR_TO_HOSTADDR(resv[n]->ai_addr, resv[n]->ai_addrlen,
&hostaddr, (MAI_SERVPORT_STR *) 0, 0);
vstream_printf("%s =?= %s\n", hostaddr.buf, argv[1]);
vstream_printf("tested by function: %s\n",
dns_rr_eq_sa(rr, resv[n]->ai_addr) ?
"yes" : "no");
vstream_printf("tested by macro: %s\n",
DNS_RR_EQ_SA(rr, resv[n]->ai_addr) ?
"yes" : "no");
}
dns_rr_free(rr);
freeaddrinfo(res0);
myfree((void *) resv);
vstream_fflush(VSTREAM_OUT);
argv += 1;
}
return (0);
}
#endif
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