3311ff84ea
ntp 4.2.8p5 Reviewed by: cy, roberto Relnotes: yes Differential Revision: https://reviews.freebsd.org/D4828
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
/*
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* socktoa - return a numeric host name from a sockaddr_storage structure
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*/
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#include <config.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#include <arpa/inet.h>
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#include <stdio.h>
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#include "ntp_fp.h"
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#include "lib_strbuf.h"
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#include "ntp_stdlib.h"
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#include "ntp.h"
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#include "ntp_debug.h"
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const char *
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socktohost(
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const sockaddr_u *sock
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)
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{
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const char svc[] = "ntp";
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char * pbuf;
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char * pliar;
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int gni_flags;
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struct addrinfo hints;
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struct addrinfo * alist;
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struct addrinfo * ai;
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sockaddr_u addr;
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size_t octets;
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int a_info;
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int saved_errno;
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saved_errno = socket_errno();
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/* reverse the address to purported DNS name */
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LIB_GETBUF(pbuf);
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gni_flags = NI_DGRAM | NI_NAMEREQD;
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if (getnameinfo(&sock->sa, SOCKLEN(sock), pbuf, LIB_BUFLENGTH,
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NULL, 0, gni_flags)) {
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errno = saved_errno;
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return stoa(sock); /* use address */
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}
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TRACE(1, ("%s reversed to %s\n", stoa(sock), pbuf));
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/*
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* Resolve the reversed name and make sure the reversed address
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* is among the results.
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*/
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ZERO(hints);
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hints.ai_family = AF(sock);
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hints.ai_protocol = IPPROTO_UDP;
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hints.ai_socktype = SOCK_DGRAM;
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hints.ai_flags = 0;
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alist = NULL;
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a_info = getaddrinfo(pbuf, svc, &hints, &alist);
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if (a_info == EAI_NONAME
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#ifdef EAI_NODATA
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|| a_info == EAI_NODATA
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#endif
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) {
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hints.ai_flags = AI_CANONNAME;
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#ifdef AI_ADDRCONFIG
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hints.ai_flags |= AI_ADDRCONFIG;
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#endif
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a_info = getaddrinfo(pbuf, svc, &hints, &alist);
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}
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#ifdef AI_ADDRCONFIG
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/* Some older implementations don't like AI_ADDRCONFIG. */
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if (a_info == EAI_BADFLAGS) {
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hints.ai_flags &= ~AI_ADDRCONFIG;
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a_info = getaddrinfo(pbuf, svc, &hints, &alist);
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}
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#endif
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if (a_info)
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goto forward_fail;
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INSIST(alist != NULL);
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for (ai = alist; ai != NULL; ai = ai->ai_next) {
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/*
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* Make a convenience sockaddr_u copy from ai->ai_addr
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* because casting from sockaddr * to sockaddr_u * is
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* risking alignment problems on platforms where
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* sockaddr_u has stricter alignment than sockaddr,
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* such as sparc.
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*/
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ZERO_SOCK(&addr);
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octets = min(sizeof(addr), ai->ai_addrlen);
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memcpy(&addr, ai->ai_addr, octets);
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if (SOCK_EQ(sock, &addr))
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break;
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}
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freeaddrinfo(alist);
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if (ai != NULL) {
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errno = saved_errno;
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return pbuf; /* forward check passed */
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}
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forward_fail:
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TRACE(1, ("%s forward check lookup fail: %s\n", pbuf,
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gai_strerror(a_info)));
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LIB_GETBUF(pliar);
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snprintf(pliar, LIB_BUFLENGTH, "%s (%s)", stoa(sock), pbuf);
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errno = saved_errno;
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return pliar;
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}
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