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-rw-r--r--src/udp.c335
1 files changed, 335 insertions, 0 deletions
diff --git a/src/udp.c b/src/udp.c
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+++ b/src/udp.c
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+/*-
+ * 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.
+ *
+ * $FreeBSD: src/usr.sbin/ppp/udp.c,v 1.20.26.1 2010/12/21 17:10:29 kensmith Exp $
+ */
+
+#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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