/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <termios.h>
#include <unistd.h>
#include "layer.h"
#include "defs.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "lqr.h"
#include "hdlc.h"
#include "throughput.h"
#include "fsm.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "async.h"
#include "descriptor.h"
#include "physical.h"
#include "main.h"
#include "udp.h"
#define UDP_CONNECTED 1
#define UDP_UNCONNECTED 2
#define UDP_MAYBEUNCONNECTED 3
struct udpdevice {
struct device dev; /* What struct physical knows about */
struct sockaddr_in sock; /* peer address */
unsigned connected : 2; /* Have we connect()d ? */
};
#define device2udp(d) ((d)->type == UDP_DEVICE ? (struct udpdevice *)d : NULL)
unsigned
udp_DeviceSize(void)
{
return sizeof(struct udpdevice);
}
static ssize_t
udp_Sendto(struct physical *p, const void *v, size_t n)
{
struct udpdevice *dev = device2udp(p->handler);
int ret;
switch (dev->connected) {
case UDP_CONNECTED:
ret = write(p->fd, v, n);
break;
case UDP_UNCONNECTED:
default:
ret = sendto(p->fd, v, n, 0, (struct sockaddr *)&dev->sock,
sizeof dev->sock);
break;
}
if (dev->connected == UDP_MAYBEUNCONNECTED) {
if (ret == -1 && errno == EISCONN) {
dev->connected = UDP_CONNECTED;
ret = write(p->fd, v, n);
} else
dev->connected = UDP_UNCONNECTED;
}
return ret;
}
static ssize_t
udp_Recvfrom(struct physical *p, void *v, size_t n)
{
struct udpdevice *dev = device2udp(p->handler);
int sz, ret;
if (dev->connected == UDP_CONNECTED)
return read(p->fd, v, n);
sz = sizeof dev->sock;
ret = recvfrom(p->fd, v, n, 0, (struct sockaddr *)&dev->sock, &sz);
if (*p->name.full == '\0') {
snprintf(p->name.full, sizeof p->name.full, "%s:%d/udp",
inet_ntoa(dev->sock.sin_addr), ntohs(dev->sock.sin_port));
p->name.base = p->name.full;
}
return ret;
}
static void
udp_Free(struct physical *p)
{
struct udpdevice *dev = device2udp(p->handler);
free(dev);
}
static void
udp_device2iov(struct device *d, struct iovec *iov, int *niov,
int maxiov __unused, int *auxfd __unused, int *nauxfd __unused)
{
int sz = physical_MaxDeviceSize();
iov[*niov].iov_base = realloc(d, sz);
if (iov[*niov].iov_base == NULL) {
log_Printf(LogALERT, "Failed to allocate memory: %d\n", sz);
AbortProgram(EX_OSERR);
}
iov[*niov].iov_len = sz;
(*niov)++;
}
static const struct device baseudpdevice = {
UDP_DEVICE,
"udp",
0,
{ CD_NOTREQUIRED, 0 },
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
udp_Free,
udp_Recvfrom,
udp_Sendto,
udp_device2iov,
NULL,
NULL,
NULL
};
struct device *
udp_iov2device(int type, struct physical *p, struct iovec *iov, int *niov,
int maxiov __unused, int *auxfd __unused, int *nauxfd __unused)
{
if (type == UDP_DEVICE) {
struct udpdevice *dev = (struct udpdevice *)iov[(*niov)++].iov_base;
dev = realloc(dev, sizeof *dev); /* Reduce to the correct size */
if (dev == NULL) {
log_Printf(LogALERT, "Failed to allocate memory: %d\n",
(int)(sizeof *dev));
AbortProgram(EX_OSERR);
}
/* Refresh function pointers etc */
memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev);
physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC);
return &dev->dev;
}
return NULL;
}
static struct udpdevice *
udp_CreateDevice(struct physical *p, char *host, char *port)
{
struct udpdevice *dev;
struct servent *sp;
if ((dev = malloc(sizeof *dev)) == NULL) {
log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n",
p->link.name, strerror(errno));
return NULL;
}
dev->sock.sin_family = AF_INET;
dev->sock.sin_addr = GetIpAddr(host);
if (dev->sock.sin_addr.s_addr == INADDR_NONE) {
log_Printf(LogWARN, "%s: %s: unknown host\n", p->link.name, host);
free(dev);
return NULL;
}
dev->sock.sin_port = htons(atoi(port));
if (dev->sock.sin_port == 0) {
sp = getservbyname(port, "udp");
if (sp)
dev->sock.sin_port = sp->s_port;
else {
log_Printf(LogWARN, "%s: %s: unknown service\n", p->link.name, port);
free(dev);
return NULL;
}
}
log_Printf(LogPHASE, "%s: Connecting to %s:%s/udp\n", p->link.name,
host, port);
p->fd = socket(PF_INET, SOCK_DGRAM, 0);
if (p->fd >= 0) {
log_Printf(LogDEBUG, "%s: Opened udp socket %s\n", p->link.name,
p->name.full);
if (connect(p->fd, (struct sockaddr *)&dev->sock, sizeof dev->sock) == 0) {
dev->connected = UDP_CONNECTED;
return dev;
} else
log_Printf(LogWARN, "%s: connect: %s\n", p->name.full, strerror(errno));
} else
log_Printf(LogWARN, "%s: socket: %s\n", p->name.full, strerror(errno));
close(p->fd);
p->fd = -1;
free(dev);
return NULL;
}
struct device *
udp_Create(struct physical *p)
{
char *cp, *host, *port, *svc;
struct udpdevice *dev;
dev = NULL;
if (p->fd < 0) {
if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) {
*cp = '\0';
host = p->name.full;
port = cp + 1;
svc = strchr(port, '/');
if (svc && strcasecmp(svc, "/udp")) {
*cp = ':';
return NULL;
}
if (svc) {
p->fd--; /* We own the device but maybe can't use it - change fd */
*svc = '\0';
}
if (*host && *port)
dev = udp_CreateDevice(p, host, port);
*cp = ':';
if (svc)
*svc = '/';
}
} else {
/* See if we're a connected udp socket */
struct stat st;
if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
int type, sz;
sz = sizeof type;
if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) {
log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
close(p->fd);
p->fd = -1;
return NULL;
}
if (sz == sizeof type && type == SOCK_DGRAM) {
struct sockaddr_in sock;
struct sockaddr *sockp = (struct sockaddr *)&sock;
if ((dev = malloc(sizeof *dev)) == NULL) {
log_Printf(LogWARN, "%s: Cannot allocate a udp device: %s\n",
p->link.name, strerror(errno));
return NULL;
}
if (getpeername(p->fd, sockp, &sz) == 0) {
log_Printf(LogPHASE, "%s: Link is a connected udp socket\n",
p->link.name);
dev->connected = UDP_CONNECTED;
} else {
log_Printf(LogPHASE, "%s: Link is a disconnected udp socket\n",
p->link.name);
dev->connected = UDP_MAYBEUNCONNECTED;
if (p->link.lcp.cfg.openmode != OPEN_PASSIVE) {
log_Printf(LogPHASE, "%s: Changing openmode to PASSIVE\n",
p->link.name);
p->link.lcp.cfg.openmode = OPEN_PASSIVE;
}
}
}
}
}
if (dev) {
memcpy(&dev->dev, &baseudpdevice, sizeof dev->dev);
physical_SetupStack(p, dev->dev.name, PHYSICAL_FORCE_SYNC);
if (p->cfg.cd.necessity != CD_DEFAULT)
log_Printf(LogWARN, "Carrier settings ignored\n");
return &dev->dev;
}
return NULL;
}
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