Avoid using length fields in socket addresses

Remove code to set or reference the length fields of socket addresses
(sa_len/sin_len/sin6_len), since they aren't portable and setting them
is not required.  Remove autoconf tests for those fields which are no
longer used or which were never used.

There is one exception: in localaddr.c, we still neeed to reference
sa_len for the definition of ifreq_size on platforms which have
sa_len.  Leave that behind, along with the autoconf test which defines
SA_LEN.

src/clients/klist/klist.c

@@ -822,9 +822,6 @@ void one_addr(a)
         {
             struct sockaddr_in *sinp = ss2sin (&ss);
             sinp->sin_family = AF_INET;
-#ifdef HAVE_SA_LEN
-            sinp->sin_len = sizeof (struct sockaddr_in);
-#endif
             memcpy (&sinp->sin_addr, a->contents, 4);
         }
         break;
@@ -834,9 +831,6 @@ void one_addr(a)
         {
             struct sockaddr_in6 *sin6p = ss2sin6 (&ss);
             sin6p->sin6_family = AF_INET6;
-#ifdef HAVE_SA_LEN
-            sin6p->sin6_len = sizeof (struct sockaddr_in6);
-#endif
             memcpy (&sin6p->sin6_addr, a->contents, 16);
         }
         break;

src/configure.in

@@ -402,9 +402,6 @@ AC_CHECK_HEADER(regexp.h, [], [],
 #define RETURN(c) return(c)
 #define ERROR(c)
 ])
-AC_CHECK_MEMBERS([struct sockaddr_in.sin_len, struct sockaddr.sa_len], , ,
-  [#include <sys/types.h>
-#include <netinet/in.h>])
 AC_CHECK_MEMBERS([struct stat.st_mtimensec,struct stat.st_mtimespec.tv_nsec,struct stat.st_mtim.tv_nsec],,,[#include <sys/types.h>
 #include <sys/stat.h>])
 KRB5_AC_REGEX_FUNCS
@@ -1003,15 +1000,6 @@ else
 fi
 AC_SUBST(GSSRPC__BSD_TYPEALIASES)
 
-# sockaddr length field checks
-
-AC_CHECK_MEMBERS([struct sockaddr_in.sin_len], , ,
-  [#include <sys/types.h>
-@%:@include <netinet/in.h>])
-AC_CHECK_MEMBERS([struct sockaddr.sa_len], , ,
-  [#include <sys/types.h>
-@%:@include <sys/socket.h>])
-
 AC_MSG_CHECKING([return type of setrpcent])
 AC_CACHE_VAL(k5_cv_type_setrpcent,
 [AC_TRY_COMPILE([#include <netdb.h>

src/lib/apputils/net-server.c

@@ -708,16 +708,10 @@ setup_tcp_listener_ports(struct socksetup *data)
 
     memset(&sin4, 0, sizeof(sin4));
     sin4.sin_family = AF_INET;
-#ifdef HAVE_SA_LEN
-    sin4.sin_len = sizeof(sin4);
-#endif
     sin4.sin_addr.s_addr = INADDR_ANY;
 
     memset(&sin6, 0, sizeof(sin6));
     sin6.sin6_family = AF_INET6;
-#ifdef SIN6_LEN
-    sin6.sin6_len = sizeof(sin6);
-#endif
     sin6.sin6_addr = in6addr_any;
 
     FOREACH_ELT (tcp_port_data, i, port) {
@@ -776,16 +770,10 @@ setup_rpc_listener_ports(struct socksetup *data)
 
     memset(&sin4, 0, sizeof(sin4));
     sin4.sin_family = AF_INET;
-#ifdef HAVE_SA_LEN
-    sin4.sin_len = sizeof(sin4);
-#endif
     sin4.sin_addr.s_addr = INADDR_ANY;
 
     memset(&sin6, 0, sizeof(sin6));
     sin6.sin6_family = AF_INET6;
-#ifdef HAVE_SA_LEN
-    sin6.sin6_len = sizeof(sin6);
-#endif
     sin6.sin6_addr = in6addr_any;
 
     FOREACH_ELT (rpc_svc_data, i, svc) {
@@ -846,9 +834,6 @@ setup_udp_pktinfo_ports(struct socksetup *data)
 
         memset(&sa, 0, sizeof(sa));
         sa.sin_family = AF_INET;
-#ifdef HAVE_SA_LEN
-        sa.sin_len = sizeof(sa);
-#endif
         r = setup_udp_port_1(data, (struct sockaddr *)&sa, 4);
         if (r == 0)
             data->do_ipv4_udp_all = FALSE;
@@ -861,9 +846,6 @@ setup_udp_pktinfo_ports(struct socksetup *data)
 
         memset(&sa, 0, sizeof(sa));
         sa.sin6_family = AF_INET6;
-#ifdef HAVE_SA_LEN
-        sa.sin6_len = sizeof(sa);
-#endif
         r = setup_udp_port_1(data, (struct sockaddr *)&sa, 6);
         if (r == 0)
             data->do_ipv6_udp_all = FALSE;

src/lib/krb5/os/localaddr.c

@@ -243,11 +243,6 @@ addr_eq (const struct sockaddr *s1, const struct sockaddr *s2)
 {
     if (s1->sa_family != s2->sa_family)
         return 0;
-#ifdef HAVE_SA_LEN
-    if (s1->sa_len != s2->sa_len)
-        return 0;
-    return !memcmp (s1, s2, s1->sa_len);
-#else
 #define CMPTYPE(T,F) (!memcmp(&((const T*)s1)->F,&((const T*)s2)->F,sizeof(((const T*)s1)->F)))
     switch (s1->sa_family) {
     case AF_INET:
@@ -258,7 +253,6 @@ addr_eq (const struct sockaddr *s1, const struct sockaddr *s2)
         /* Err on side of duplicate listings.  */
         return 0;
     }
-#endif
 }
 #endif
 
@@ -1402,19 +1396,13 @@ get_localaddrs (krb5_context context, krb5_address ***addr, int use_profile)
                 struct sockaddr_in *sinp = ss2sin (&ss);
                 sinp->sin_family = AF_INET;
                 addrp = &sinp->sin_addr;
-#ifdef HAVE_SA_LEN
-                sinp->sin_len = sizeof (struct sockaddr_in);
-#endif
                 break;
             }
             case ADDRTYPE_INET6:
             {
                 struct sockaddr_in6 *sin6p = ss2sin6 (&ss);
                 sin6p->sin6_family = AF_INET6;
                 addrp = &sin6p->sin6_addr;
-#ifdef HAVE_SA_LEN
-                sin6p->sin6_len = sizeof (struct sockaddr_in6);
-#endif
                 break;
             }
             default:

src/lib/rpc/clnt_generic.c

@@ -76,9 +76,6 @@ clnt_create(
 		return (NULL);
 	}
 	memset(&sockin, 0, sizeof(sockin));
-#if HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
-	sockin.sin_len = sizeof(sockin);
-#endif
 	sockin.sin_family = h->h_addrtype;
 	sockin.sin_port = 0;
 	memmove((char*)&sockin.sin_addr, h->h_addr, sizeof(sockin.sin_addr));

src/lib/rpc/clnt_simple.c

@@ -107,9 +107,6 @@ callrpc(
 		memset(&server_addr, 0, sizeof(server_addr));
 		memmove((char *)&server_addr.sin_addr, hp->h_addr,
 			sizeof(server_addr.sin_addr));
-#if HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
-		server_addr.sin_len = sizeof(server_addr);
-#endif
 		server_addr.sin_family = AF_INET;
 		server_addr.sin_port =  0;
 		if ((crp->client = clntudp_create(&server_addr, prognum,

src/lib/rpc/getrpcport.c

@@ -54,9 +54,6 @@ gssrpc_getrpcport(
 		return (0);
 	memset(&addr, 0, sizeof(addr));
 	memmove((char *) &addr.sin_addr, hp->h_addr, sizeof(addr.sin_addr));
-#if HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
-	addr.sin_len = sizeof(addr);
-#endif
 	addr.sin_family = AF_INET;
 	addr.sin_port =  0;
 	return (pmap_getport(&addr, prognum, versnum, proto));

src/lib/rpc/svc_tcp.c

@@ -161,9 +161,6 @@ svctcp_create(
 		madesock = TRUE;
 		memset(&ss, 0, sizeof(ss));
 		sa->sa_family = AF_INET;
-#ifdef HAVE_SA_LEN
-		sa->sa_len = sizeof(struct sockaddr_in);
-#endif
 	} else {
 		len = sizeof(struct sockaddr_storage);
 		if (getsockname(sock, sa, &len) != 0) {

src/lib/rpc/svc_udp.c

@@ -132,9 +132,6 @@ svcudp_bufcreate(
 		madesock = TRUE;
 		memset(&ss, 0, sizeof(ss));
 		sa->sa_family = AF_INET;
-#ifdef HAVE_SA_LEN
-		sa->sa_len = sizeof(struct sockaddr_in);
-#endif
 	} else {
 		len = sizeof(struct sockaddr_storage);
 		if (getsockname(sock, sa, &len) < 0) {

src/tests/resolve/addrinfo-test.c

@@ -266,12 +266,6 @@ int main (int argc, char *argv[])
         return 1;
     }
 
-#if defined(SIN6_LEN)
-    if (ap->ai_addr->sa_len == 0)
-        printf ("BAD: sa_len not set!\n");
-#endif
-
-
     for (ap2 = ap; ap2; ap2 = ap2->ai_next) {
         char hbuf[NI_MAXHOST], pbuf[NI_MAXSERV];
         /* If we don't do this, even AIX's own getnameinfo will reject

src/util/support/fake-addrinfo.c

@@ -566,9 +566,6 @@ static inline int fai_add_entry (struct addrinfo **result, void *addr,
         sin4->sin_family = AF_INET;
         sin4->sin_addr = *(struct in_addr *)addr;
         sin4->sin_port = port;
-#ifdef HAVE_SA_LEN
-        sin4->sin_len = sizeof (struct sockaddr_in);
-#endif
     }
     if (template->ai_family == AF_INET6) {
         struct sockaddr_in6 *sin6;
@@ -580,9 +577,6 @@ static inline int fai_add_entry (struct addrinfo **result, void *addr,
         sin6->sin6_family = AF_INET6;
         sin6->sin6_addr = *(struct in6_addr *)addr;
         sin6->sin6_port = port;
-#ifdef HAVE_SA_LEN
-        sin6->sin6_len = sizeof (struct sockaddr_in6);
-#endif
     }
     n->ai_next = *result;
     *result = n;
@@ -1294,9 +1288,6 @@ getaddrinfo (const char *name, const char *serv, const struct addrinfo *hint,
            just leftover from previous contents of the memory
            block?).  So, always override what libc returned.  */
         ai->ai_addr->sa_family = ai->ai_family;
-#ifdef HAVE_SA_LEN /* always true on AIX, actually */
-        ai->ai_addr->sa_len = ai->ai_addrlen;
-#endif
     }
 #endif