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/* ==========================================================================
* unix.c - unix socket connection implementation
* --------------------------------------------------------------------------
* Copyright (C) 2022 zhenwei pi
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
* ==========================================================================
*/
#include "server.h"
#include "connection.h"
static ConnectionType CT_Unix;
static const char *connUnixGetType(connection *conn) {
UNUSED(conn);
return CONN_TYPE_UNIX;
}
static void connUnixEventHandler(struct aeEventLoop *el, int fd, void *clientData, int mask) {
connectionTypeTcp()->ae_handler(el, fd, clientData, mask);
}
static int connUnixAddr(connection *conn, char *ip, size_t ip_len, int *port, int remote) {
return connectionTypeTcp()->addr(conn, ip, ip_len, port, remote);
}
static int connUnixIsLocal(connection *conn) {
UNUSED(conn);
return 1; /* Unix socket is always local connection */
}
static int connUnixListen(connListener *listener) {
int fd;
mode_t *perm = (mode_t *)listener->priv;
if (listener->bindaddr_count == 0)
return C_OK;
/* currently listener->bindaddr_count is always 1, we still use a loop here in case Redis supports multi Unix socket in the future */
for (int j = 0; j < listener->bindaddr_count; j++) {
char *addr = listener->bindaddr[j];
unlink(addr); /* don't care if this fails */
fd = anetUnixServer(server.neterr, addr, *perm, server.tcp_backlog);
if (fd == ANET_ERR) {
serverLog(LL_WARNING, "Failed opening Unix socket: %s", server.neterr);
exit(1);
}
anetNonBlock(NULL, fd);
anetCloexec(fd);
listener->fd[listener->count++] = fd;
}
return C_OK;
}
static connection *connCreateUnix(void) {
connection *conn = zcalloc(sizeof(connection));
conn->type = &CT_Unix;
conn->fd = -1;
conn->iovcnt = IOV_MAX;
return conn;
}
static connection *connCreateAcceptedUnix(int fd, void *priv) {
UNUSED(priv);
connection *conn = connCreateUnix();
conn->fd = fd;
conn->state = CONN_STATE_ACCEPTING;
return conn;
}
static void connUnixAcceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
int cfd, max = MAX_ACCEPTS_PER_CALL;
UNUSED(el);
UNUSED(mask);
UNUSED(privdata);
while(max--) {
cfd = anetUnixAccept(server.neterr, fd);
if (cfd == ANET_ERR) {
if (errno != EWOULDBLOCK)
serverLog(LL_WARNING,
"Accepting client connection: %s", server.neterr);
return;
}
serverLog(LL_VERBOSE,"Accepted connection to %s", server.unixsocket);
acceptCommonHandler(connCreateAcceptedUnix(cfd, NULL),CLIENT_UNIX_SOCKET,NULL);
}
}
static void connUnixShutdown(connection *conn) {
connectionTypeTcp()->shutdown(conn);
}
static void connUnixClose(connection *conn) {
connectionTypeTcp()->close(conn);
}
static int connUnixAccept(connection *conn, ConnectionCallbackFunc accept_handler) {
return connectionTypeTcp()->accept(conn, accept_handler);
}
static int connUnixWrite(connection *conn, const void *data, size_t data_len) {
return connectionTypeTcp()->write(conn, data, data_len);
}
static int connUnixWritev(connection *conn, const struct iovec *iov, int iovcnt) {
return connectionTypeTcp()->writev(conn, iov, iovcnt);
}
static int connUnixRead(connection *conn, void *buf, size_t buf_len) {
return connectionTypeTcp()->read(conn, buf, buf_len);
}
static int connUnixSetWriteHandler(connection *conn, ConnectionCallbackFunc func, int barrier) {
return connectionTypeTcp()->set_write_handler(conn, func, barrier);
}
static int connUnixSetReadHandler(connection *conn, ConnectionCallbackFunc func) {
return connectionTypeTcp()->set_read_handler(conn, func);
}
static const char *connUnixGetLastError(connection *conn) {
return strerror(conn->last_errno);
}
static ssize_t connUnixSyncWrite(connection *conn, char *ptr, ssize_t size, long long timeout) {
return syncWrite(conn->fd, ptr, size, timeout);
}
static ssize_t connUnixSyncRead(connection *conn, char *ptr, ssize_t size, long long timeout) {
return syncRead(conn->fd, ptr, size, timeout);
}
static ssize_t connUnixSyncReadLine(connection *conn, char *ptr, ssize_t size, long long timeout) {
return syncReadLine(conn->fd, ptr, size, timeout);
}
static ConnectionType CT_Unix = {
/* connection type */
.get_type = connUnixGetType,
/* connection type initialize & finalize & configure */
.init = NULL,
.cleanup = NULL,
.configure = NULL,
/* ae & accept & listen & error & address handler */
.ae_handler = connUnixEventHandler,
.accept_handler = connUnixAcceptHandler,
.addr = connUnixAddr,
.is_local = connUnixIsLocal,
.listen = connUnixListen,
/* create/shutdown/close connection */
.conn_create = connCreateUnix,
.conn_create_accepted = connCreateAcceptedUnix,
.shutdown = connUnixShutdown,
.close = connUnixClose,
/* connect & accept */
.connect = NULL,
.blocking_connect = NULL,
.accept = connUnixAccept,
/* IO */
.write = connUnixWrite,
.writev = connUnixWritev,
.read = connUnixRead,
.set_write_handler = connUnixSetWriteHandler,
.set_read_handler = connUnixSetReadHandler,
.get_last_error = connUnixGetLastError,
.sync_write = connUnixSyncWrite,
.sync_read = connUnixSyncRead,
.sync_readline = connUnixSyncReadLine,
/* pending data */
.has_pending_data = NULL,
.process_pending_data = NULL,
};
int RedisRegisterConnectionTypeUnix(void)
{
return connTypeRegister(&CT_Unix);
}
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