362 lines
8.4 KiB
C
362 lines
8.4 KiB
C
/*
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* Copyright 2016 Jakub Klama <jceel@FreeBSD.org>
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* All rights reserved
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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 providing 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <assert.h>
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#include <sys/types.h>
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#ifdef __APPLE__
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# include "../apple_endian.h"
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#else
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# include <sys/endian.h>
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#endif
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#include <sys/socket.h>
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#include <sys/event.h>
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#include <sys/uio.h>
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#include <netdb.h>
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#include "../lib9p.h"
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#include "../lib9p_impl.h"
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#include "../log.h"
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#include "socket.h"
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struct l9p_socket_softc
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{
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struct l9p_connection *ls_conn;
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struct sockaddr ls_sockaddr;
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socklen_t ls_socklen;
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pthread_t ls_thread;
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int ls_fd;
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};
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static int l9p_socket_readmsg(struct l9p_socket_softc *, void **, size_t *);
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static int l9p_socket_get_response_buffer(struct l9p_request *,
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struct iovec *, size_t *, void *);
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static int l9p_socket_send_response(struct l9p_request *, const struct iovec *,
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const size_t, const size_t, void *);
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static void l9p_socket_drop_response(struct l9p_request *, const struct iovec *,
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size_t, void *);
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static void *l9p_socket_thread(void *);
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static ssize_t xread(int, void *, size_t);
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static ssize_t xwrite(int, void *, size_t);
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int
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l9p_start_server(struct l9p_server *server, const char *host, const char *port)
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{
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struct addrinfo *res, *res0, hints;
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struct kevent kev[2];
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struct kevent event[2];
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int err, kq, i, val, evs, nsockets = 0;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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err = getaddrinfo(host, port, &hints, &res0);
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if (err)
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return (-1);
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for (res = res0; res; res = res->ai_next) {
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int s = socket(res->ai_family, res->ai_socktype,
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res->ai_protocol);
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val = 1;
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
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if (s < 0)
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continue;
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if (bind(s, res->ai_addr, res->ai_addrlen) < 0) {
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close(s);
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continue;
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}
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EV_SET(&kev[nsockets++], s, EVFILT_READ, EV_ADD | EV_ENABLE, 0,
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0, 0);
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listen(s, 10);
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}
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if (nsockets < 1) {
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L9P_LOG(L9P_ERROR, "bind(): %s", strerror(errno));
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return(-1);
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}
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kq = kqueue();
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if (kevent(kq, kev, nsockets, NULL, 0, NULL) < 0) {
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L9P_LOG(L9P_ERROR, "kevent(): %s", strerror(errno));
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return (-1);
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}
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for (;;) {
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evs = kevent(kq, NULL, 0, event, nsockets, NULL);
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if (evs < 0) {
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if (errno == EINTR)
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continue;
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L9P_LOG(L9P_ERROR, "kevent(): %s", strerror(errno));
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return (-1);
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}
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for (i = 0; i < evs; i++) {
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struct sockaddr client_addr;
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socklen_t client_addr_len = sizeof(client_addr);
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int news = accept((int)event[i].ident, &client_addr,
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&client_addr_len);
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if (news < 0) {
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L9P_LOG(L9P_WARNING, "accept(): %s",
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strerror(errno));
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continue;
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}
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l9p_socket_accept(server, news, &client_addr,
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client_addr_len);
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}
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}
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}
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void
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l9p_socket_accept(struct l9p_server *server, int conn_fd,
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struct sockaddr *client_addr, socklen_t client_addr_len)
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{
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struct l9p_socket_softc *sc;
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struct l9p_connection *conn;
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char host[NI_MAXHOST + 1];
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char serv[NI_MAXSERV + 1];
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int err;
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err = getnameinfo(client_addr, client_addr_len, host, NI_MAXHOST, serv,
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NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV);
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if (err != 0) {
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L9P_LOG(L9P_WARNING, "cannot look up client name: %s",
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gai_strerror(err));
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} else {
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L9P_LOG(L9P_INFO, "new connection from %s:%s", host, serv);
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}
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if (l9p_connection_init(server, &conn) != 0) {
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L9P_LOG(L9P_ERROR, "cannot create new connection");
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return;
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}
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sc = l9p_calloc(1, sizeof(*sc));
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sc->ls_conn = conn;
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sc->ls_fd = conn_fd;
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/*
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* Fill in transport handler functions and aux argument.
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*/
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conn->lc_lt.lt_aux = sc;
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conn->lc_lt.lt_get_response_buffer = l9p_socket_get_response_buffer;
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conn->lc_lt.lt_send_response = l9p_socket_send_response;
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conn->lc_lt.lt_drop_response = l9p_socket_drop_response;
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err = pthread_create(&sc->ls_thread, NULL, l9p_socket_thread, sc);
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if (err) {
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L9P_LOG(L9P_ERROR,
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"pthread_create (for connection from %s:%s): error %s",
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host, serv, strerror(err));
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l9p_connection_close(sc->ls_conn);
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free(sc);
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}
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}
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static void *
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l9p_socket_thread(void *arg)
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{
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struct l9p_socket_softc *sc = (struct l9p_socket_softc *)arg;
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struct iovec iov;
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void *buf;
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size_t length;
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for (;;) {
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if (l9p_socket_readmsg(sc, &buf, &length) != 0)
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break;
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iov.iov_base = buf;
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iov.iov_len = length;
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l9p_connection_recv(sc->ls_conn, &iov, 1, NULL);
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free(buf);
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}
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L9P_LOG(L9P_INFO, "connection closed");
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l9p_connection_close(sc->ls_conn);
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free(sc);
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return (NULL);
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}
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static int
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l9p_socket_readmsg(struct l9p_socket_softc *sc, void **buf, size_t *size)
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{
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uint32_t msize;
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size_t toread;
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ssize_t ret;
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void *buffer;
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int fd = sc->ls_fd;
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assert(fd > 0);
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buffer = l9p_malloc(sizeof(uint32_t));
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ret = xread(fd, buffer, sizeof(uint32_t));
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if (ret < 0) {
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L9P_LOG(L9P_ERROR, "read(): %s", strerror(errno));
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return (-1);
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}
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if (ret != sizeof(uint32_t)) {
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if (ret == 0)
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L9P_LOG(L9P_DEBUG, "%p: EOF", (void *)sc->ls_conn);
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else
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L9P_LOG(L9P_ERROR,
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"short read: %zd bytes of %zd expected",
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ret, sizeof(uint32_t));
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return (-1);
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}
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msize = le32toh(*(uint32_t *)buffer);
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toread = msize - sizeof(uint32_t);
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buffer = l9p_realloc(buffer, msize);
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ret = xread(fd, (char *)buffer + sizeof(uint32_t), toread);
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if (ret < 0) {
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L9P_LOG(L9P_ERROR, "read(): %s", strerror(errno));
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return (-1);
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}
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if (ret != (ssize_t)toread) {
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L9P_LOG(L9P_ERROR, "short read: %zd bytes of %zd expected",
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ret, toread);
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return (-1);
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}
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*size = msize;
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*buf = buffer;
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L9P_LOG(L9P_INFO, "%p: read complete message, buf=%p size=%d",
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(void *)sc->ls_conn, buffer, msize);
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return (0);
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}
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static int
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l9p_socket_get_response_buffer(struct l9p_request *req, struct iovec *iov,
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size_t *niovp, void *arg __unused)
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{
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size_t size = req->lr_conn->lc_msize;
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void *buf;
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buf = l9p_malloc(size);
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iov[0].iov_base = buf;
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iov[0].iov_len = size;
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*niovp = 1;
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return (0);
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}
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static int
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l9p_socket_send_response(struct l9p_request *req __unused,
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const struct iovec *iov, const size_t niov __unused, const size_t iolen,
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void *arg)
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{
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struct l9p_socket_softc *sc = (struct l9p_socket_softc *)arg;
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assert(sc->ls_fd >= 0);
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L9P_LOG(L9P_DEBUG, "%p: sending reply, buf=%p, size=%d", arg,
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iov[0].iov_base, iolen);
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if (xwrite(sc->ls_fd, iov[0].iov_base, iolen) != (int)iolen) {
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L9P_LOG(L9P_ERROR, "short write: %s", strerror(errno));
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return (-1);
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}
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free(iov[0].iov_base);
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return (0);
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}
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static void
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l9p_socket_drop_response(struct l9p_request *req __unused,
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const struct iovec *iov, size_t niov __unused, void *arg __unused)
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{
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L9P_LOG(L9P_DEBUG, "%p: drop buf=%p", arg, iov[0].iov_base);
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free(iov[0].iov_base);
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}
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static ssize_t
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xread(int fd, void *buf, size_t count)
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{
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size_t done = 0;
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ssize_t ret;
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while (done < count) {
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ret = read(fd, (char *)buf + done, count - done);
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if (ret < 0) {
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if (errno == EINTR)
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continue;
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return (-1);
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}
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if (ret == 0)
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return ((ssize_t)done);
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done += (size_t)ret;
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}
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return ((ssize_t)done);
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}
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static ssize_t
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xwrite(int fd, void *buf, size_t count)
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{
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size_t done = 0;
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ssize_t ret;
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while (done < count) {
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ret = write(fd, (char *)buf + done, count - done);
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if (ret < 0) {
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if (errno == EINTR)
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continue;
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return (-1);
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}
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if (ret == 0)
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return ((ssize_t)done);
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done += (size_t)ret;
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}
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return ((ssize_t)done);
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}
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