usr.sbin/ppp/tcp.c

   1 /*-
   2  * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/usr.sbin/ppp/tcp.c,v 1.10.2.4 2002/09/01 02:12:32 brian Exp $
  27  * $DragonFly: src/usr.sbin/ppp/tcp.c,v 1.2 2003/06/17 04:30:01 dillon Exp $
  28  */
  29
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32 #include <netinet/in.h>
  33 #include <arpa/inet.h>
  34 #include <netdb.h>
  35
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <sys/stat.h>
  41 #include <sys/uio.h>
  42 #include <termios.h>
  43 #include <unistd.h>
  44
  45 #include "layer.h"
  46 #include "defs.h"
  47 #include "mbuf.h"
  48 #include "log.h"
  49 #include "timer.h"
  50 #include "lqr.h"
  51 #include "hdlc.h"
  52 #include "throughput.h"
  53 #include "fsm.h"
  54 #include "lcp.h"
  55 #include "ccp.h"
  56 #include "link.h"
  57 #include "async.h"
  58 #include "descriptor.h"
  59 #include "physical.h"
  60 #include "tcp.h"
  61
  62 static int
  63 tcp_OpenConnection(const char *name, char *host, char *port)
  64 {
  65   struct sockaddr_in dest;
  66   int sock;
  67   struct servent *sp;
  68
  69   dest.sin_family = AF_INET;
  70   dest.sin_addr = GetIpAddr(host);
  71   if (dest.sin_addr.s_addr == INADDR_NONE) {
  72     log_Printf(LogWARN, "%s: %s: unknown host\n", name, host);
  73     return -2;
  74   }
  75   dest.sin_port = htons(atoi(port));
  76   if (dest.sin_port == 0) {
  77     sp = getservbyname(port, "tcp");
  78     if (sp)
  79       dest.sin_port = sp->s_port;
  80     else {
  81       log_Printf(LogWARN, "%s: %s: unknown service\n", name, port);
  82       return -2;
  83     }
  84   }
  85   log_Printf(LogPHASE, "%s: Connecting to %s:%s/tcp\n", name, host, port);
  86
  87   sock = socket(PF_INET, SOCK_STREAM, 0);
  88   if (sock < 0)
  89     return -2;
  90
  91   if (connect(sock, (struct sockaddr *)&dest, sizeof dest) < 0) {
  92     log_Printf(LogWARN, "%s: connect: %s\n", name, strerror(errno));
  93     close(sock);
  94     return -2;
  95   }
  96
  97   return sock;
  98 }
  99
 100 static struct device tcpdevice = {
 101   TCP_DEVICE,
 102   "tcp",
 103   0,
 104   { CD_NOTREQUIRED, 0 },
 105   NULL,
 106   NULL,
 107   NULL,
 108   NULL,
 109   NULL,
 110   NULL,
 111   NULL,
 112   NULL,
 113   NULL,
 114   NULL,
 115   NULL,
 116   NULL,
 117   NULL,
 118   NULL
 119 };
 120
 121 struct device *
 122 tcp_iov2device(int type, struct physical *p, struct iovec *iov,
 123                int *niov, int maxiov, int *auxfd, int *nauxfd)
 124 {
 125   if (type == TCP_DEVICE) {
 126     free(iov[(*niov)++].iov_base);
 127     physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
 128     return &tcpdevice;
 129   }
 130
 131   return NULL;
 132 }
 133
 134 struct device *
 135 tcp_Create(struct physical *p)
 136 {
 137   char *cp, *host, *port, *svc;
 138
 139   if (p->fd < 0) {
 140     if ((cp = strchr(p->name.full, ':')) != NULL && !strchr(cp + 1, ':')) {
 141       *cp = '\0';
 142       host = p->name.full;
 143       port = cp + 1;
 144       svc = strchr(port, '/');
 145       if (svc && strcasecmp(svc, "/tcp")) {
 146         *cp = ':';
 147         return 0;
 148       }
 149       if (svc) {
 150         p->fd--;     /* We own the device but maybe can't use it - change fd */
 151         *svc = '\0';
 152       }
 153       if (*host && *port) {
 154         p->fd = tcp_OpenConnection(p->link.name, host, port);
 155         *cp = ':';
 156         if (svc)
 157           *svc = '/';
 158         if (p->fd >= 0)
 159           log_Printf(LogDEBUG, "%s: Opened tcp socket %s\n", p->link.name,
 160                      p->name.full);
 161       } else {
 162         if (svc)
 163           *svc = '/';
 164         *cp = ':';
 165       }
 166     }
 167   }
 168
 169   if (p->fd >= 0) {
 170     /* See if we're a tcp socket */
 171     struct stat st;
 172
 173     if (fstat(p->fd, &st) != -1 && (st.st_mode & S_IFSOCK)) {
 174       int type, sz;
 175
 176       sz = sizeof type;
 177       if (getsockopt(p->fd, SOL_SOCKET, SO_TYPE, &type, &sz) == -1) {
 178         log_Printf(LogPHASE, "%s: Link is a closed socket !\n", p->link.name);
 179         close(p->fd);
 180         p->fd = -1;
 181         return NULL;
 182       }
 183
 184       if (sz == sizeof type && type == SOCK_STREAM) {
 185         struct sockaddr_in sock;
 186         struct sockaddr *sockp = (struct sockaddr *)&sock;
 187
 188         if (*p->name.full == '\0') {
 189           sz = sizeof sock;
 190           if (getpeername(p->fd, sockp, &sz) != 0 ||
 191               sz != sizeof(struct sockaddr_in) || sock.sin_family != AF_INET) {
 192             log_Printf(LogDEBUG, "%s: Link is SOCK_STREAM, but not inet\n",
 193                        p->link.name);
 194             return NULL;
 195           }
 196
 197           log_Printf(LogPHASE, "%s: Link is a tcp socket\n", p->link.name);
 198
 199           snprintf(p->name.full, sizeof p->name.full, "%s:%d/tcp",
 200                    inet_ntoa(sock.sin_addr), ntohs(sock.sin_port));
 201           p->name.base = p->name.full;
 202         }
 203         physical_SetupStack(p, tcpdevice.name, PHYSICAL_FORCE_ASYNC);
 204         if (p->cfg.cd.necessity != CD_DEFAULT)
 205           log_Printf(LogWARN, "Carrier settings ignored\n");
 206         return &tcpdevice;
 207       }
 208     }
 209   }
 210
 211   return NULL;
 212 }