659 lines
15 KiB
C
659 lines
15 KiB
C
/*
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Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef AROS
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#include "aros_compat.h"
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#endif
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#ifdef WIN32
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#include "win32_compat.h"
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#else
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#endif/*WIN32*/
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#ifdef HAVE_SYS_FILIO_H
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#include <sys/filio.h>
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#endif
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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif
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#include <sys/types.h>
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#include "libnfs-zdr.h"
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#include "libnfs.h"
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#include "libnfs-raw.h"
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#include "libnfs-private.h"
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#include "slist.h"
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#ifdef WIN32
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//has to be included after stdlib!!
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#include "win32_errnowrapper.h"
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#endif
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static int rpc_reconnect_requeue(struct rpc_context *rpc);
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static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s);
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static void set_nonblocking(int fd)
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{
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int v = 0;
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#if defined(WIN32)
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long nonblocking=1;
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v = ioctl(fd, FIONBIO, &nonblocking);
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#else
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v = fcntl(fd, F_GETFL, 0);
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fcntl(fd, F_SETFL, v | O_NONBLOCK);
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#endif //FIXME
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}
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int rpc_get_fd(struct rpc_context *rpc)
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{
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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return rpc->fd;
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}
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int rpc_which_events(struct rpc_context *rpc)
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{
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int events;
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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events = rpc->is_connected ? POLLIN : POLLOUT;
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if (rpc->is_udp != 0) {
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/* for udp sockets we only wait for pollin */
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return POLLIN;
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}
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if (rpc->outqueue) {
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events |= POLLOUT;
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}
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return events;
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}
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static int rpc_write_to_socket(struct rpc_context *rpc)
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{
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int32_t count;
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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if (rpc->fd == -1) {
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rpc_set_error(rpc, "trying to write but not connected");
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return -1;
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}
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while (rpc->outqueue != NULL) {
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int64_t total;
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total = rpc->outqueue->outdata.size;
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count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
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if (count == -1) {
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if (errno == EAGAIN || errno == EWOULDBLOCK) {
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return 0;
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}
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rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
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return -1;
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}
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rpc->outqueue->written += count;
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if (rpc->outqueue->written == total) {
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struct rpc_pdu *pdu = rpc->outqueue;
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SLIST_REMOVE(&rpc->outqueue, pdu);
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SLIST_ADD_END(&rpc->waitpdu, pdu);
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}
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}
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return 0;
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}
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static int rpc_read_from_socket(struct rpc_context *rpc)
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{
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int available;
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int size;
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int pdu_size;
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int32_t count;
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
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rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
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return -1;
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}
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if (available == 0) {
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rpc_set_error(rpc, "Socket has been closed");
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return -1;
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}
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if (rpc->is_udp) {
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char *buf;
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socklen_t socklen = sizeof(rpc->udp_src);
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buf = malloc(available);
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if (buf == NULL) {
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rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
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return -1;
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}
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count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
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if (count < 0) {
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rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
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free(buf);
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}
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if (rpc_process_pdu(rpc, buf, count) != 0) {
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rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
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free(buf);
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return -1;
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}
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free(buf);
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return 0;
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}
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/* read record marker, 4 bytes at the beginning of every pdu */
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if (rpc->inbuf == NULL) {
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rpc->insize = 4;
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rpc->inbuf = malloc(rpc->insize);
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if (rpc->inbuf == NULL) {
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rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
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return -1;
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}
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}
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if (rpc->inpos < 4) {
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size = 4 - rpc->inpos;
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count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
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if (count == -1) {
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if (errno == EINTR) {
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return 0;
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}
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rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
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return -1;
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}
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available -= count;
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rpc->inpos += count;
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}
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if (available == 0) {
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return 0;
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}
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pdu_size = rpc_get_pdu_size(rpc->inbuf);
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if (rpc->insize < pdu_size) {
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unsigned char *buf;
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buf = malloc(pdu_size);
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if (buf == NULL) {
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rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
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return -1;
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}
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memcpy(buf, rpc->inbuf, rpc->insize);
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free(rpc->inbuf);
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rpc->inbuf = buf;
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rpc->insize = rpc_get_pdu_size(rpc->inbuf);
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}
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size = available;
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if (size > rpc->insize - rpc->inpos) {
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size = rpc->insize - rpc->inpos;
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}
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count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
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if (count == -1) {
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if (errno == EINTR) {
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return 0;
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}
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rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
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return -1;
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}
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available -= count;
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rpc->inpos += count;
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if (rpc->inpos == rpc->insize) {
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if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
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rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
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return -1;
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}
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free(rpc->inbuf);
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rpc->inbuf = NULL;
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rpc->insize = 0;
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rpc->inpos = 0;
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}
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return 0;
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}
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int rpc_service(struct rpc_context *rpc, int revents)
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{
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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if (revents & POLLERR) {
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#ifdef WIN32
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char err = 0;
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#else
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int err = 0;
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#endif
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socklen_t err_size = sizeof(err);
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if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
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(char *)&err, &err_size) != 0 || err != 0) {
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if (err == 0) {
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err = errno;
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}
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rpc_set_error(rpc, "rpc_service: socket error "
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"%s(%d).",
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strerror(err), err);
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} else {
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rpc_set_error(rpc, "rpc_service: POLLERR, "
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"Unknown socket error.");
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}
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if (rpc->connect_cb != NULL) {
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rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
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}
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return -1;
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}
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if (revents & POLLHUP) {
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rpc_set_error(rpc, "Socket failed with POLLHUP");
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if (rpc->connect_cb != NULL) {
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rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
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}
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return -1;
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}
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if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
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int err = 0;
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socklen_t err_size = sizeof(err);
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if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
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(char *)&err, &err_size) != 0 || err != 0) {
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if (err == 0) {
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err = errno;
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}
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rpc_set_error(rpc, "rpc_service: socket error "
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"%s(%d) while connecting.",
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strerror(err), err);
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if (rpc->connect_cb != NULL) {
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rpc->connect_cb(rpc, RPC_STATUS_ERROR,
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NULL, rpc->connect_data);
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}
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return -1;
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}
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rpc->is_connected = 1;
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if (rpc->connect_cb != NULL) {
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rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
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}
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return 0;
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}
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if (revents & POLLIN) {
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if (rpc_read_from_socket(rpc) != 0) {
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rpc_reconnect_requeue(rpc);
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return 0;
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}
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}
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if (revents & POLLOUT && rpc->outqueue != NULL) {
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if (rpc_write_to_socket(rpc) != 0) {
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rpc_set_error(rpc, "write to socket failed");
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return -1;
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}
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}
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return 0;
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}
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void rpc_set_autoreconnect(struct rpc_context *rpc)
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{
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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rpc->auto_reconnect = 1;
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}
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void rpc_unset_autoreconnect(struct rpc_context *rpc)
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{
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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rpc->auto_reconnect = 0;
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}
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static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
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{
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int socksize;
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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switch (s->ss_family) {
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case AF_INET:
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socksize = sizeof(struct sockaddr_in);
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rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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break;
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default:
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rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
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return -1;
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}
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if (rpc->fd == -1) {
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rpc_set_error(rpc, "Failed to open socket");
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return -1;
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}
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/* Some systems allow you to set capabilities on an executable
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* to allow the file to be executed with privilege to bind to
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* privileged system ports, even if the user is not root.
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*
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* Opportunistically try to bind the socket to a low numbered
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* system port in the hope that the user is either root or the
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* executable has the CAP_NET_BIND_SERVICE.
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*
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* As soon as we fail the bind() with EACCES we know we will never
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* be able to bind to a system port so we terminate the loop.
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*
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* On linux, use
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* sudo setcap 'cap_net_bind_service=+ep' /path/executable
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* to make the executable able to bind to a system port.
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*
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* On Windows, there is no concept of privileged ports. Thus
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* binding will usually succeed.
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*/
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{
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struct sockaddr_in sin;
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static int portOfs = 0;
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const int firstPort = 512; /* >= 512 according to Sun docs */
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const int portCount = IPPORT_RESERVED - firstPort;
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int startOfs, port, rc;
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if (portOfs == 0) {
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portOfs = time(NULL) % 400;
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}
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startOfs = portOfs;
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do {
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rc = -1;
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port = htons(firstPort + portOfs);
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portOfs = (portOfs + 1) % portCount;
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/* skip well-known ports */
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if (!getservbyport(port, "tcp")) {
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memset(&sin, 0, sizeof(sin));
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sin.sin_port = port;
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = 0;
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rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
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#if !defined(WIN32)
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/* we got EACCES, so don't try again */
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if (rc != 0 && errno == EACCES)
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break;
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#endif
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}
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} while (rc != 0 && portOfs != startOfs);
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}
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set_nonblocking(rpc->fd);
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if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
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rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
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return -1;
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}
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return 0;
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}
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int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
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{
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struct sockaddr_in *sin = (struct sockaddr_in *)&rpc->s;
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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if (rpc->fd != -1) {
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rpc_set_error(rpc, "Trying to connect while already connected");
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return -1;
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}
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if (rpc->is_udp != 0) {
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rpc_set_error(rpc, "Trying to connect on UDP socket");
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return -1;
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}
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rpc->auto_reconnect = 0;
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sin->sin_family = AF_INET;
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sin->sin_port = htons(port);
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if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
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rpc_set_error(rpc, "Not a valid server ip address");
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return -1;
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}
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switch (rpc->s.ss_family) {
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case AF_INET:
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#ifdef HAVE_SOCKADDR_LEN
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sin->sin_len = sizeof(struct sockaddr_in);
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#endif
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break;
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}
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rpc->connect_cb = cb;
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rpc->connect_data = private_data;
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if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
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return -1;
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}
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return 0;
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}
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int rpc_disconnect(struct rpc_context *rpc, char *error)
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{
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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rpc_unset_autoreconnect(rpc);
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if (rpc->fd != -1) {
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close(rpc->fd);
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}
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rpc->fd = -1;
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rpc->is_connected = 0;
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rpc_error_all_pdus(rpc, error);
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return 0;
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}
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static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
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{
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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if (status != RPC_STATUS_SUCCESS) {
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rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
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return;
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}
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rpc->is_connected = 1;
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rpc->connect_cb = NULL;
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}
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/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
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static int rpc_reconnect_requeue(struct rpc_context *rpc)
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{
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struct rpc_pdu *pdu;
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assert(rpc->magic == RPC_CONTEXT_MAGIC);
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if (rpc->fd != -1) {
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close(rpc->fd);
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}
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rpc->fd = -1;
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rpc->is_connected = 0;
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/* socket is closed so we will not get any replies to any commands
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* in flight. Move them all over from the waitpdu queue back to the out queue
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*/
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for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
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SLIST_REMOVE(&rpc->waitpdu, pdu);
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SLIST_ADD(&rpc->outqueue, pdu);
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/* we have to re-send the whole pdu again */
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pdu->written = 0;
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}
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if (rpc->auto_reconnect != 0) {
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rpc->connect_cb = reconnect_cb;
|
|
|
|
if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
|
|
rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
|
|
{
|
|
struct addrinfo *ai = NULL;
|
|
char service[6];
|
|
|
|
assert(rpc->magic == RPC_CONTEXT_MAGIC);
|
|
|
|
if (rpc->is_udp == 0) {
|
|
rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
|
|
return -1;
|
|
}
|
|
|
|
sprintf(service, "%d", port);
|
|
if (getaddrinfo(addr, service, NULL, &ai) != 0) {
|
|
rpc_set_error(rpc, "Invalid address:%s. "
|
|
"Can not resolv into IPv4/v6 structure.");
|
|
return -1;
|
|
}
|
|
|
|
switch(ai->ai_family) {
|
|
case AF_INET:
|
|
rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
|
|
if (rpc->fd == -1) {
|
|
rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
|
|
freeaddrinfo(ai);
|
|
return -1;
|
|
}
|
|
|
|
if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
|
|
rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
|
|
freeaddrinfo(ai);
|
|
return -1;
|
|
}
|
|
break;
|
|
default:
|
|
rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
|
|
freeaddrinfo(ai);
|
|
return -1;
|
|
}
|
|
|
|
freeaddrinfo(ai);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
|
|
{
|
|
struct addrinfo *ai = NULL;
|
|
char service[6];
|
|
|
|
assert(rpc->magic == RPC_CONTEXT_MAGIC);
|
|
|
|
if (rpc->is_udp == 0) {
|
|
rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
|
|
return -1;
|
|
}
|
|
|
|
sprintf(service, "%d", port);
|
|
if (getaddrinfo(addr, service, NULL, &ai) != 0) {
|
|
rpc_set_error(rpc, "Invalid address:%s. "
|
|
"Can not resolv into IPv4/v6 structure.");
|
|
return -1;
|
|
}
|
|
|
|
if (rpc->udp_dest) {
|
|
free(rpc->udp_dest);
|
|
rpc->udp_dest = NULL;
|
|
}
|
|
rpc->udp_dest = malloc(ai->ai_addrlen);
|
|
if (rpc->udp_dest == NULL) {
|
|
rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
|
|
freeaddrinfo(ai);
|
|
return -1;
|
|
}
|
|
memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
|
|
freeaddrinfo(ai);
|
|
|
|
rpc->is_broadcast = is_broadcast;
|
|
setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
|
|
{
|
|
assert(rpc->magic == RPC_CONTEXT_MAGIC);
|
|
|
|
return (struct sockaddr *)&rpc->udp_src;
|
|
}
|
|
|
|
int rpc_queue_length(struct rpc_context *rpc)
|
|
{
|
|
int i=0;
|
|
struct rpc_pdu *pdu;
|
|
|
|
assert(rpc->magic == RPC_CONTEXT_MAGIC);
|
|
|
|
for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
|
|
i++;
|
|
}
|
|
for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
|
|
i++;
|
|
}
|
|
return i;
|
|
}
|