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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "src/core/iomgr/sockaddr_utils.h"
#include <arpa/inet.h>
#include <errno.h>
#include <string.h>
#include <grpc/support/host_port.h>
#include <grpc/support/string.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
static const gpr_uint8 kV4MappedPrefix[] = {0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0xff, 0xff};
int grpc_sockaddr_is_v4mapped(const struct sockaddr *addr,
struct sockaddr_in *addr4_out) {
GPR_ASSERT(addr != (struct sockaddr *)addr4_out);
if (addr->sa_family == AF_INET6) {
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *)addr;
if (memcmp(addr6->sin6_addr.s6_addr, kV4MappedPrefix,
sizeof(kV4MappedPrefix)) == 0) {
if (addr4_out != NULL) {
/* Normalize ::ffff:0.0.0.0/96 to IPv4. */
memset(addr4_out, 0, sizeof(*addr4_out));
addr4_out->sin_family = AF_INET;
/* s6_addr32 would be nice, but it's non-standard. */
memcpy(&addr4_out->sin_addr, &addr6->sin6_addr.s6_addr[12], 4);
addr4_out->sin_port = addr6->sin6_port;
}
return 1;
}
}
return 0;
}
int grpc_sockaddr_to_v4mapped(const struct sockaddr *addr,
struct sockaddr_in6 *addr6_out) {
GPR_ASSERT(addr != (struct sockaddr *)addr6_out);
if (addr->sa_family == AF_INET) {
const struct sockaddr_in *addr4 = (const struct sockaddr_in *)addr;
memset(addr6_out, 0, sizeof(*addr6_out));
addr6_out->sin6_family = AF_INET6;
memcpy(&addr6_out->sin6_addr.s6_addr[0], kV4MappedPrefix, 12);
memcpy(&addr6_out->sin6_addr.s6_addr[12], &addr4->sin_addr, 4);
addr6_out->sin6_port = addr4->sin_port;
return 1;
}
return 0;
}
int grpc_sockaddr_is_wildcard(const struct sockaddr *addr, int *port_out) {
struct sockaddr_in addr4_normalized;
if (grpc_sockaddr_is_v4mapped(addr, &addr4_normalized)) {
addr = (struct sockaddr *)&addr4_normalized;
}
if (addr->sa_family == AF_INET) {
/* Check for 0.0.0.0 */
const struct sockaddr_in *addr4 = (const struct sockaddr_in *)addr;
if (addr4->sin_addr.s_addr != 0) {
return 0;
}
*port_out = ntohs(addr4->sin_port);
return 1;
} else if (addr->sa_family == AF_INET6) {
/* Check for :: */
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *)addr;
int i;
for (i = 0; i < 16; i++) {
if (addr6->sin6_addr.s6_addr[i] != 0) {
return 0;
}
}
*port_out = ntohs(addr6->sin6_port);
return 1;
} else {
return 0;
}
}
void grpc_sockaddr_make_wildcards(int port, struct sockaddr_in *wild4_out,
struct sockaddr_in6 *wild6_out) {
memset(wild4_out, 0, sizeof(*wild4_out));
wild4_out->sin_family = AF_INET;
wild4_out->sin_port = htons(port);
memset(wild6_out, 0, sizeof(*wild6_out));
wild6_out->sin6_family = AF_INET6;
wild6_out->sin6_port = htons(port);
}
int grpc_sockaddr_to_string(char **out, const struct sockaddr *addr,
int normalize) {
const int save_errno = errno;
struct sockaddr_in addr_normalized;
char ntop_buf[INET6_ADDRSTRLEN];
const void *ip = NULL;
int port;
int ret;
*out = NULL;
if (normalize && grpc_sockaddr_is_v4mapped(addr, &addr_normalized)) {
addr = (const struct sockaddr *)&addr_normalized;
}
if (addr->sa_family == AF_INET) {
const struct sockaddr_in *addr4 = (const struct sockaddr_in *)addr;
ip = &addr4->sin_addr;
port = ntohs(addr4->sin_port);
} else if (addr->sa_family == AF_INET6) {
const struct sockaddr_in6 *addr6 = (const struct sockaddr_in6 *)addr;
ip = &addr6->sin6_addr;
port = ntohs(addr6->sin6_port);
}
if (ip != NULL &&
inet_ntop(addr->sa_family, ip, ntop_buf, sizeof(ntop_buf)) != NULL) {
ret = gpr_join_host_port(out, ntop_buf, port);
} else {
ret = gpr_asprintf(out, "(sockaddr family=%d)", addr->sa_family);
}
/* This is probably redundant, but we wouldn't want to log the wrong error. */
errno = save_errno;
return ret;
}
int grpc_sockaddr_get_port(const struct sockaddr *addr) {
switch (addr->sa_family) {
case AF_INET:
return ntohs(((struct sockaddr_in *)addr)->sin_port);
case AF_INET6:
return ntohs(((struct sockaddr_in6 *)addr)->sin6_port);
default:
gpr_log(GPR_ERROR, "Unknown socket family %d in %s", addr->sa_family,
__FUNCTION__);
return 0;
}
}
int grpc_sockaddr_set_port(const struct sockaddr *addr, int port) {
switch (addr->sa_family) {
case AF_INET:
((struct sockaddr_in *)addr)->sin_port = htons(port);
return 1;
case AF_INET6:
((struct sockaddr_in6 *)addr)->sin6_port = htons(port);
return 1;
default:
gpr_log(GPR_ERROR, "Unknown socket family %d in %s", addr->sa_family,
__FUNCTION__);
return 0;
}
}
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