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325 lines
8.3 KiB
C
325 lines
8.3 KiB
C
/*-
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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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int
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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, int *auxfd, int *nauxfd)
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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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{ 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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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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};
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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, int *auxfd, int *nauxfd)
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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.s_addr = inet_addr(host);
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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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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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/* We can't getpeername().... */
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dev->connected = UDP_MAYBEUNCONNECTED;
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log_Printf(LogPHASE, "%s: Link is a udp socket\n", p->link.name);
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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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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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