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* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyaddr_r): Use union type to avoid strict aliasing problem. (_nss_dns_gethostbyname2_r): Likewise. * resolv/nss_dns/dns-network.c (_nss_dns_getnetbyaddr_r): Likewise. (_nss_dns_getnetbyname_r): Likewise.
* resolv/gethnamaddr.c (_gethtent): Likewise. (gethostbyname2): Likewise.
This commit is contained in:
Andreas Jaeger
parent
ee2a5ae875
commit
16b6606283
@ -510,7 +510,12 @@ gethostbyname2(name, af)
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const char *name;
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int af;
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{
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querybuf *buf, *origbuf;
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union
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{
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querybuf *buf;
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u_char *ptr;
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} buf;
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querybuf *origbuf;
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register const char *cp;
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char *bp;
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int n, size, type, len;
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@ -616,20 +621,20 @@ gethostbyname2(name, af)
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break;
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}
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buf = origbuf = (querybuf *) alloca (1024);
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buf.buf = origbuf = (querybuf *) alloca (1024);
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if ((n = __libc_res_nsearch(&_res, name, C_IN, type, buf->buf, 1024,
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(u_char **) &buf)) < 0) {
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if (buf != origbuf)
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free (buf);
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if ((n = __libc_res_nsearch(&_res, name, C_IN, type, buf.buf->buf, 1024,
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&buf.ptr)) < 0) {
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if (buf.buf != origbuf)
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free (buf.buf);
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dprintf("res_nsearch failed (%d)\n", n);
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if (errno == ECONNREFUSED)
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return (_gethtbyname2(name, af));
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return (NULL);
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}
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ret = getanswer(buf, n, name, type);
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if (buf != origbuf)
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free (buf);
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ret = getanswer(buf.buf, n, name, type);
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if (buf.buf != origbuf)
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free (buf.buf);
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return ret;
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}
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@ -644,7 +649,12 @@ gethostbyaddr(addr, len, af)
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static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
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int n;
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socklen_t size;
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querybuf *buf, *orig_buf;
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union
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{
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querybuf *buf;
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u_char *ptr;
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} buf;
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querybuf *orig_buf;
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register struct hostent *hp;
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char qbuf[MAXDNAME+1], *qp = NULL;
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#ifdef SUNSECURITY
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@ -706,27 +716,27 @@ gethostbyaddr(addr, len, af)
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abort();
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}
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buf = orig_buf = (querybuf *) alloca (1024);
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buf.buf = orig_buf = (querybuf *) alloca (1024);
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n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf->buf, 1024,
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(u_char **) &buf);
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n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf.buf->buf, 1024,
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&buf.ptr);
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if (n < 0 && af == AF_INET6) {
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strcpy(qp, "ip6.int");
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n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf->buf,
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buf != orig_buf ? MAXPACKET : 1024,
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(u_char **) &buf);
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n = __libc_res_nquery(&_res, qbuf, C_IN, T_PTR, buf.buf->buf,
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buf.buf != orig_buf ? MAXPACKET : 1024,
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&buf.ptr);
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}
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if (n < 0) {
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if (buf != orig_buf)
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free (buf);
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if (buf.buf != orig_buf)
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free (buf.buf);
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dprintf("res_nquery failed (%d)\n", n);
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if (errno == ECONNREFUSED)
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return (_gethtbyaddr(addr, len, af));
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return (NULL);
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}
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hp = getanswer(buf, n, qbuf, T_PTR);
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if (buf != orig_buf)
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free (buf);
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hp = getanswer(buf.buf, n, qbuf, T_PTR);
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if (buf.buf != orig_buf)
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free (buf.buf);
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if (!hp)
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return (NULL); /* h_errno was set by getanswer() */
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#ifdef SUNSECURITY
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@ -132,7 +132,12 @@ _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result,
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char *buffer, size_t buflen, int *errnop,
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int *h_errnop)
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{
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querybuf *host_buffer, *orig_host_buffer;
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union
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{
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querybuf *buf;
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u_char *ptr;
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} host_buffer;
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querybuf *orig_host_buffer;
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char tmp[NS_MAXDNAME];
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int size, type, n;
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const char *cp;
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@ -170,10 +175,10 @@ _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result,
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&& (cp = res_hostalias (&_res, name, tmp, sizeof (tmp))) != NULL)
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name = cp;
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host_buffer = orig_host_buffer = (querybuf *) alloca (1024);
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host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024);
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n = __libc_res_nsearch (&_res, name, C_IN, type, host_buffer->buf,
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1024, (u_char **) &host_buffer);
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n = __libc_res_nsearch (&_res, name, C_IN, type, host_buffer.buf->buf,
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1024, &host_buffer.ptr);
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if (n < 0)
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{
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enum nss_status status = (errno == ECONNREFUSED
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@ -188,14 +193,14 @@ _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result,
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by having the RES_USE_INET6 bit in _res.options set, we try
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another lookup. */
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if (af == AF_INET6 && (_res.options & RES_USE_INET6))
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n = __libc_res_nsearch (&_res, name, C_IN, T_A, host_buffer->buf,
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host_buffer != orig_host_buffer
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? MAXPACKET : 1024, (u_char **) &host_buffer);
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n = __libc_res_nsearch (&_res, name, C_IN, T_A, host_buffer.buf->buf,
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host_buffer.buf != orig_host_buffer
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? MAXPACKET : 1024, &host_buffer.ptr);
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if (n < 0)
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{
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if (host_buffer != orig_host_buffer)
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free (host_buffer);
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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return status;
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}
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@ -205,10 +210,10 @@ _nss_dns_gethostbyname2_r (const char *name, int af, struct hostent *result,
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result->h_length = INADDRSZ;;
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}
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status = getanswer_r (host_buffer, n, name, type, result, buffer, buflen,
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status = getanswer_r (host_buffer.buf, n, name, type, result, buffer, buflen,
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errnop, h_errnop, map);
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if (host_buffer != orig_host_buffer)
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free (host_buffer);
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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return status;
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}
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@ -247,7 +252,12 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
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char *h_addr_ptrs[MAX_NR_ADDRS + 1];
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char linebuffer[0];
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} *host_data = (struct host_data *) buffer;
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querybuf *host_buffer, *orig_host_buffer;
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union
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{
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querybuf *buf;
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u_char *ptr;
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} host_buffer;
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querybuf *orig_host_buffer;
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char qbuf[MAXDNAME+1], *qp = NULL;
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size_t size;
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int n, status;
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@ -305,30 +315,30 @@ _nss_dns_gethostbyaddr_r (const void *addr, socklen_t len, int af,
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break;
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}
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host_buffer = orig_host_buffer = (querybuf *) alloca (1024);
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host_buffer.buf = orig_host_buffer = (querybuf *) alloca (1024);
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n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer->buf,
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1024, (u_char **) &host_buffer);
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n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf,
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1024, &host_buffer.ptr);
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if (n < 0 && af == AF_INET6)
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{
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strcpy (qp, "ip6.int");
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n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer->buf,
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host_buffer != orig_host_buffer
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? MAXPACKET : 1024, (u_char **) &host_buffer);
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n = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, host_buffer.buf->buf,
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host_buffer.buf != orig_host_buffer
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? MAXPACKET : 1024, &host_buffer.ptr);
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}
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if (n < 0)
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{
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*h_errnop = h_errno;
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__set_errno (olderr);
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if (host_buffer != orig_host_buffer)
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free (host_buffer);
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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return errno == ECONNREFUSED ? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
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}
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status = getanswer_r (host_buffer, n, qbuf, T_PTR, result, buffer, buflen,
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status = getanswer_r (host_buffer.buf, n, qbuf, T_PTR, result, buffer, buflen,
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errnop, h_errnop, 0 /* XXX */);
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if (host_buffer != orig_host_buffer)
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free (host_buffer);
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if (host_buffer.buf != orig_host_buffer)
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free (host_buffer.buf);
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if (status != NSS_STATUS_SUCCESS)
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{
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*h_errnop = h_errno;
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@ -110,7 +110,12 @@ _nss_dns_getnetbyname_r (const char *name, struct netent *result,
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int *herrnop)
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{
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/* Return entry for network with NAME. */
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querybuf *net_buffer, *orig_net_buffer;
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union
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{
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querybuf *buf;
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u_char *ptr;
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} net_buffer;
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querybuf *orig_net_buffer;
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int anslen;
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char *qbuf;
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enum nss_status status;
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@ -120,25 +125,25 @@ _nss_dns_getnetbyname_r (const char *name, struct netent *result,
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qbuf = strdupa (name);
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net_buffer = orig_net_buffer = (querybuf *) alloca (1024);
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net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
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anslen = __libc_res_nsearch (&_res, qbuf, C_IN, T_PTR, net_buffer->buf,
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1024, (u_char **) &net_buffer);
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anslen = __libc_res_nsearch (&_res, qbuf, C_IN, T_PTR, net_buffer.buf->buf,
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1024, &net_buffer.ptr);
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if (anslen < 0)
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{
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/* Nothing found. */
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*errnop = errno;
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if (net_buffer != orig_net_buffer)
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free (net_buffer);
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if (net_buffer.buf != orig_net_buffer)
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free (net_buffer.buf);
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return (errno == ECONNREFUSED
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|| errno == EPFNOSUPPORT
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|| errno == EAFNOSUPPORT)
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? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
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}
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status = getanswer_r (net_buffer, anslen, result, buffer, buflen, BYNAME);
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if (net_buffer != orig_net_buffer)
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free (net_buffer);
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status = getanswer_r (net_buffer.buf, anslen, result, buffer, buflen, BYNAME);
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if (net_buffer.buf != orig_net_buffer)
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free (net_buffer.buf);
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return status;
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}
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@ -150,7 +155,12 @@ _nss_dns_getnetbyaddr_r (uint32_t net, int type, struct netent *result,
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{
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/* Return entry for network with NAME. */
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enum nss_status status;
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querybuf *net_buffer, *orig_net_buffer;
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union
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{
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querybuf *buf;
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u_char *ptr;
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} net_buffer;
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querybuf *orig_net_buffer;
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unsigned int net_bytes[4];
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char qbuf[MAXDNAME];
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int cnt, anslen;
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@ -190,26 +200,26 @@ _nss_dns_getnetbyaddr_r (uint32_t net, int type, struct netent *result,
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break;
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}
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net_buffer = orig_net_buffer = (querybuf *) alloca (1024);
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net_buffer.buf = orig_net_buffer = (querybuf *) alloca (1024);
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anslen = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, net_buffer->buf,
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1024, (u_char **) &net_buffer);
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anslen = __libc_res_nquery (&_res, qbuf, C_IN, T_PTR, net_buffer.buf->buf,
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1024, &net_buffer.ptr);
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if (anslen < 0)
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{
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/* Nothing found. */
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int err = errno;
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__set_errno (olderr);
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if (net_buffer != orig_net_buffer)
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free (net_buffer);
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if (net_buffer.buf != orig_net_buffer)
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free (net_buffer.buf);
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return (err == ECONNREFUSED
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|| err == EPFNOSUPPORT
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|| err == EAFNOSUPPORT)
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? NSS_STATUS_UNAVAIL : NSS_STATUS_NOTFOUND;
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}
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status = getanswer_r (net_buffer, anslen, result, buffer, buflen, BYADDR);
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if (net_buffer != orig_net_buffer)
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free (net_buffer);
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status = getanswer_r (net_buffer.buf, anslen, result, buffer, buflen, BYADDR);
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if (net_buffer.buf != orig_net_buffer)
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free (net_buffer.buf);
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if (status == NSS_STATUS_SUCCESS)
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{
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/* Strip trailing zeros. */
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