0b626a289e
This way we know how to connect to secondary node when we are primary. The same variable is used by the secondary node - it only accepts connections from the address stored in 'remote' variable. In cluster configurations it is common that each node has its individual IP address and there is one addtional shared IP address which is assigned to primary node. It seems it is possible that if the shared IP address is from the same network as the individual IP address it might be choosen by the kernel as a source address for connection with the secondary node. Such connection will be rejected by secondary, as it doesn't come from primary node individual IP. Add 'source' variable that allows to specify source IP address we want to bind to before connecting to the secondary node. MFC after: 1 week
362 lines
8.2 KiB
C
362 lines
8.2 KiB
C
/*-
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* UDS - UNIX Domain Socket */
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#include <sys/types.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "hast.h"
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#include "pjdlog.h"
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#include "proto_impl.h"
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#define UDS_CTX_MAGIC 0xd541c
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struct uds_ctx {
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int uc_magic;
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struct sockaddr_un uc_sun;
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int uc_fd;
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int uc_side;
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#define UDS_SIDE_CLIENT 0
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#define UDS_SIDE_SERVER_LISTEN 1
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#define UDS_SIDE_SERVER_WORK 2
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pid_t uc_owner;
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};
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static void uds_close(void *ctx);
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static int
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uds_addr(const char *addr, struct sockaddr_un *sunp)
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{
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if (addr == NULL)
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return (-1);
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if (strncasecmp(addr, "uds://", 6) == 0)
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addr += 6;
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else if (strncasecmp(addr, "unix://", 7) == 0)
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addr += 7;
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else if (addr[0] == '/' && /* If it starts from /... */
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strstr(addr, "://") == NULL)/* ...and there is no prefix... */
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; /* ...we assume its us. */
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else
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return (-1);
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sunp->sun_family = AF_UNIX;
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if (strlcpy(sunp->sun_path, addr, sizeof(sunp->sun_path)) >=
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sizeof(sunp->sun_path)) {
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return (ENAMETOOLONG);
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}
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sunp->sun_len = SUN_LEN(sunp);
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return (0);
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}
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static int
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uds_common_setup(const char *addr, void **ctxp, int side)
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{
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struct uds_ctx *uctx;
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int ret;
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uctx = malloc(sizeof(*uctx));
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if (uctx == NULL)
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return (errno);
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/* Parse given address. */
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if ((ret = uds_addr(addr, &uctx->uc_sun)) != 0) {
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free(uctx);
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return (ret);
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}
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uctx->uc_fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (uctx->uc_fd == -1) {
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ret = errno;
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free(uctx);
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return (ret);
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}
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uctx->uc_side = side;
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uctx->uc_owner = 0;
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uctx->uc_magic = UDS_CTX_MAGIC;
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*ctxp = uctx;
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return (0);
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}
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static int
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uds_client(const char *srcaddr, const char *dstaddr, void **ctxp)
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{
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int ret;
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ret = uds_common_setup(dstaddr, ctxp, UDS_SIDE_CLIENT);
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if (ret != 0)
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return (ret);
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PJDLOG_ASSERT(srcaddr == NULL);
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return (0);
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}
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static int
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uds_connect(void *ctx, int timeout)
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{
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struct uds_ctx *uctx = ctx;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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PJDLOG_ASSERT(uctx->uc_side == UDS_SIDE_CLIENT);
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PJDLOG_ASSERT(uctx->uc_fd >= 0);
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PJDLOG_ASSERT(timeout >= -1);
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if (connect(uctx->uc_fd, (struct sockaddr *)&uctx->uc_sun,
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sizeof(uctx->uc_sun)) < 0) {
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return (errno);
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}
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return (0);
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}
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static int
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uds_connect_wait(void *ctx, int timeout)
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{
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struct uds_ctx *uctx = ctx;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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PJDLOG_ASSERT(uctx->uc_side == UDS_SIDE_CLIENT);
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PJDLOG_ASSERT(uctx->uc_fd >= 0);
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PJDLOG_ASSERT(timeout >= 0);
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return (0);
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}
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static int
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uds_server(const char *addr, void **ctxp)
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{
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struct uds_ctx *uctx;
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int ret;
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ret = uds_common_setup(addr, ctxp, UDS_SIDE_SERVER_LISTEN);
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if (ret != 0)
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return (ret);
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uctx = *ctxp;
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(void)unlink(uctx->uc_sun.sun_path);
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if (bind(uctx->uc_fd, (struct sockaddr *)&uctx->uc_sun,
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sizeof(uctx->uc_sun)) < 0) {
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ret = errno;
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uds_close(uctx);
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return (ret);
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}
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uctx->uc_owner = getpid();
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if (listen(uctx->uc_fd, 8) < 0) {
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ret = errno;
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uds_close(uctx);
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return (ret);
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}
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return (0);
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}
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static int
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uds_accept(void *ctx, void **newctxp)
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{
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struct uds_ctx *uctx = ctx;
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struct uds_ctx *newuctx;
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socklen_t fromlen;
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int ret;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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PJDLOG_ASSERT(uctx->uc_side == UDS_SIDE_SERVER_LISTEN);
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PJDLOG_ASSERT(uctx->uc_fd >= 0);
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newuctx = malloc(sizeof(*newuctx));
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if (newuctx == NULL)
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return (errno);
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fromlen = sizeof(newuctx->uc_sun);
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newuctx->uc_fd = accept(uctx->uc_fd,
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(struct sockaddr *)&newuctx->uc_sun, &fromlen);
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if (newuctx->uc_fd < 0) {
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ret = errno;
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free(newuctx);
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return (ret);
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}
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newuctx->uc_side = UDS_SIDE_SERVER_WORK;
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newuctx->uc_magic = UDS_CTX_MAGIC;
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*newctxp = newuctx;
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return (0);
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}
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static int
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uds_send(void *ctx, const unsigned char *data, size_t size, int fd)
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{
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struct uds_ctx *uctx = ctx;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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PJDLOG_ASSERT(uctx->uc_fd >= 0);
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return (proto_common_send(uctx->uc_fd, data, size, fd));
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}
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static int
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uds_recv(void *ctx, unsigned char *data, size_t size, int *fdp)
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{
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struct uds_ctx *uctx = ctx;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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PJDLOG_ASSERT(uctx->uc_fd >= 0);
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return (proto_common_recv(uctx->uc_fd, data, size, fdp));
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}
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static int
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uds_descriptor(const void *ctx)
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{
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const struct uds_ctx *uctx = ctx;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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return (uctx->uc_fd);
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}
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static void
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uds_local_address(const void *ctx, char *addr, size_t size)
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{
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const struct uds_ctx *uctx = ctx;
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struct sockaddr_un sun;
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socklen_t sunlen;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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PJDLOG_ASSERT(addr != NULL);
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sunlen = sizeof(sun);
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if (getsockname(uctx->uc_fd, (struct sockaddr *)&sun, &sunlen) < 0) {
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PJDLOG_VERIFY(strlcpy(addr, "N/A", size) < size);
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return;
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}
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PJDLOG_ASSERT(sun.sun_family == AF_UNIX);
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if (sun.sun_path[0] == '\0') {
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PJDLOG_VERIFY(strlcpy(addr, "N/A", size) < size);
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return;
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}
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PJDLOG_VERIFY(snprintf(addr, size, "uds://%s", sun.sun_path) < (ssize_t)size);
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}
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static void
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uds_remote_address(const void *ctx, char *addr, size_t size)
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{
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const struct uds_ctx *uctx = ctx;
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struct sockaddr_un sun;
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socklen_t sunlen;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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PJDLOG_ASSERT(addr != NULL);
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sunlen = sizeof(sun);
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if (getpeername(uctx->uc_fd, (struct sockaddr *)&sun, &sunlen) < 0) {
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PJDLOG_VERIFY(strlcpy(addr, "N/A", size) < size);
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return;
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}
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PJDLOG_ASSERT(sun.sun_family == AF_UNIX);
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if (sun.sun_path[0] == '\0') {
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PJDLOG_VERIFY(strlcpy(addr, "N/A", size) < size);
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return;
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}
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snprintf(addr, size, "uds://%s", sun.sun_path);
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}
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static void
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uds_close(void *ctx)
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{
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struct uds_ctx *uctx = ctx;
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PJDLOG_ASSERT(uctx != NULL);
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PJDLOG_ASSERT(uctx->uc_magic == UDS_CTX_MAGIC);
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if (uctx->uc_fd >= 0)
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close(uctx->uc_fd);
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/*
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* Unlink the socket only if we are the owner and this is descriptor
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* we listen on.
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*/
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if (uctx->uc_side == UDS_SIDE_SERVER_LISTEN &&
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uctx->uc_owner == getpid()) {
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PJDLOG_ASSERT(uctx->uc_sun.sun_path[0] != '\0');
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if (unlink(uctx->uc_sun.sun_path) == -1) {
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pjdlog_errno(LOG_WARNING,
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"Unable to unlink socket file %s",
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uctx->uc_sun.sun_path);
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}
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}
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uctx->uc_owner = 0;
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uctx->uc_magic = 0;
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free(uctx);
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}
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static struct hast_proto uds_proto = {
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.hp_name = "uds",
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.hp_client = uds_client,
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.hp_connect = uds_connect,
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.hp_connect_wait = uds_connect_wait,
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.hp_server = uds_server,
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.hp_accept = uds_accept,
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.hp_send = uds_send,
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.hp_recv = uds_recv,
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.hp_descriptor = uds_descriptor,
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.hp_local_address = uds_local_address,
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.hp_remote_address = uds_remote_address,
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.hp_close = uds_close
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};
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static __constructor void
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uds_ctor(void)
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{
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proto_register(&uds_proto, false);
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}
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