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1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
338 lines
8.7 KiB
C
338 lines
8.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1999 Brian Somers <brian@Awfulhak.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 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 AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <termios.h>
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#include <unistd.h>
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#include "layer.h"
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#include "defs.h"
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#include "mbuf.h"
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#include "log.h"
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#include "timer.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "throughput.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "async.h"
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#include "descriptor.h"
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#include "physical.h"
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#include "main.h"
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#include "udp.h"
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#define UDP_CONNECTED 1
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#define UDP_UNCONNECTED 2
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#define UDP_MAYBEUNCONNECTED 3
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struct udpdevice {
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struct device dev; /* What struct physical knows about */
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struct sockaddr_in sock; /* peer address */
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unsigned connected : 2; /* Have we connect()d ? */
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};
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#define device2udp(d) ((d)->type == UDP_DEVICE ? (struct udpdevice *)d : NULL)
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unsigned
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udp_DeviceSize(void)
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{
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return sizeof(struct udpdevice);
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}
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static ssize_t
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udp_Sendto(struct physical *p, const void *v, size_t n)
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{
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struct udpdevice *dev = device2udp(p->handler);
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int ret;
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switch (dev->connected) {
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case UDP_CONNECTED:
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ret = write(p->fd, v, n);
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break;
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case UDP_UNCONNECTED:
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default:
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ret = sendto(p->fd, v, n, 0, (struct sockaddr *)&dev->sock,
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sizeof dev->sock);
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break;
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}
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if (dev->connected == UDP_MAYBEUNCONNECTED) {
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if (ret == -1 && errno == EISCONN) {
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dev->connected = UDP_CONNECTED;
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ret = write(p->fd, v, n);
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} else
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dev->connected = UDP_UNCONNECTED;
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}
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return ret;
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}
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static ssize_t
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udp_Recvfrom(struct physical *p, void *v, size_t n)
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{
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struct udpdevice *dev = device2udp(p->handler);
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int sz, ret;
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if (dev->connected == UDP_CONNECTED)
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return read(p->fd, v, n);
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sz = sizeof dev->sock;
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ret = recvfrom(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, &sz);
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if (*p->name.full == '\0') {
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snprintf(p->name.full, sizeof p->name.full, "%s:%d/udp",
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inet_ntoa(dev->sock.sin_addr), ntohs(dev->sock.sin_port));
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p->name.base = p->name.full;
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}
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return ret;
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}
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static void
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udp_Free(struct physical *p)
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{
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struct udpdevice *dev = device2udp(p->handler);
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free(dev);
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}
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static void
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udp_device2iov(struct device *d, struct iovec *iov, int *niov,
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int maxiov __unused, int *auxfd __unused, int *nauxfd __unused)
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{
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int sz = physical_MaxDeviceSize();
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iov[*niov].iov_base = realloc(d, sz);
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if (iov[*niov].iov_base == NULL) {
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log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
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AbortProgram(EX_OSERR);
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}
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iov[*niov].iov_len = sz;
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(*niov)++;
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}
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static const struct device baseudpdevice = {
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UDP_DEVICE,
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"udp",
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0,
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{ CD_NOTREQUIRED, 0 },
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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udp_Free,
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udp_Recvfrom,
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udp_Sendto,
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udp_device2iov,
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NULL,
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NULL,
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NULL
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};
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struct device *
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udp_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
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int maxiov __unused, int *auxfd __unused, int *nauxfd __unused)
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{
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if (type == UDP_DEVICE) {
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struct udpdevice *dev = (struct udpdevice *)iov[(*niov)++].iov_base;
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dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */
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if (dev == NULL) {
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log_Printf(LogALERT, "Failed to allocate memory: %d\n",
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(int)(sizeof *dev));
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AbortProgram(EX_OSERR);
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}
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/* Refresh function pointers etc */
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memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev);
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physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC);
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return &dev->dev;
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}
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return NULL;
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}
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static struct udpdevice *
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udp_CreateDevice(struct physical *p, char *host, char *port)
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{
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struct udpdevice *dev;
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struct servent *sp;
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if ((dev = malloc(sizeof *dev)) == NULL) {
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log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n",
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p->link.name, strerror(errno));
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return NULL;
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}
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dev->sock.sin_family = AF_INET;
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dev->sock.sin_addr = GetIpAddr(host);
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if (dev->sock.sin_addr.s_addr == INADDR_NONE) {
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log_Printf(LogWARN, "%s: %s: unknown host\n", p->link.name, host);
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free(dev);
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return NULL;
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}
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dev->sock.sin_port = htons(atoi(port));
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if (dev->sock.sin_port == 0) {
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sp = getservbyname(port, "udp");
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if (sp)
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dev->sock.sin_port = sp->s_port;
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else {
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log_Printf(LogWARN, "%s: %s: unknown service\n", p->link.name, port);
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free(dev);
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return NULL;
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}
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}
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log_Printf(LogPHASE, "%s: Connecting to %s:%s/udp\n", p->link.name,
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host, port);
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p->fd = socket(PF_INET, SOCK_DGRAM, 0);
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if (p->fd >= 0) {
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log_Printf(LogDEBUG, "%s: Opened udp socket %s\n", p->link.name,
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p->name.full);
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if (connect(p->fd, (struct sockaddr *)&dev->sock, sizeof dev->sock) == 0) {
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dev->connected = UDP_CONNECTED;
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return dev;
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} else
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log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno));
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} else
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log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno));
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close(p->fd);
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p->fd = -1;
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free(dev);
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return NULL;
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}
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struct device *
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udp_Create(struct physical *p)
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{
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char *cp, *host, *port, *svc;
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struct udpdevice *dev;
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dev = NULL;
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if (p->fd < 0) {
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if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) {
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*cp = '\0';
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host = p->name.full;
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port = cp + 1;
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svc = strchr(port, '/');
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if (svc && strcasecmp(svc, "/udp")) {
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*cp = ':';
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return NULL;
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}
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if (svc) {
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p->fd--; /* We own the device but maybe can't use it - change fd */
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*svc = '\0';
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}
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if (*host && *port)
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dev = udp_CreateDevice(p, host, port);
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*cp = ':';
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if (svc)
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*svc = '/';
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}
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} else {
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/* See if we're a connected udp socket */
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struct stat st;
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if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
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int type, sz;
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sz = sizeof type;
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if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) {
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log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
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close(p->fd);
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p->fd = -1;
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return NULL;
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}
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if (sz == sizeof type && type == SOCK_DGRAM) {
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struct sockaddr_in sock;
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struct sockaddr *sockp = (struct sockaddr *)&sock;
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if ((dev = malloc(sizeof *dev)) == NULL) {
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log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n",
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p->link.name, strerror(errno));
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return NULL;
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}
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if (getpeername(p->fd, sockp, &sz) == 0) {
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log_Printf(LogPHASE, "%s: Link is a connected udp socket\n",
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p->link.name);
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dev->connected = UDP_CONNECTED;
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} else {
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log_Printf(LogPHASE, "%s: Link is a disconnected udp socket\n",
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p->link.name);
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dev->connected = UDP_MAYBEUNCONNECTED;
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if (p->link.lcp.cfg.openmode != OPEN_PASSIVE) {
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log_Printf(LogPHASE, "%s: Changing openmode to PASSIVE\n",
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p->link.name);
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p->link.lcp.cfg.openmode = OPEN_PASSIVE;
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}
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}
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}
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}
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}
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if (dev) {
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memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev);
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physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC);
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if (p->cfg.cd.necessity != CD_DEFAULT)
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log_Printf(LogWARN, "Carrier settings ignored\n");
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return &dev->dev;
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}
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return NULL;
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}
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