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mirror of https://git.FreeBSD.org/src.git synced 2024-12-23 11:18:54 +00:00
freebsd/usr.sbin/ppp/server.c
Brian Somers f4768038f0 o Remove the global CcpInfo. It's now part of the datalink.
Struct bundle will have its own struct ccp in the future
  too.
o The ``set stopped'' command now requires context and doesn't
  work on the IPCP FSM.
o Check if it's time to break out of our top level loop before
  doing a select - otherwise, we'll select forever :-(
o Remove `struct link'::ccp (a temporary hack).  It turns out
  that IpStartOutput() calls link_Output() and link_Output()
  incorrectly calls StartOutput() (really modem_StartOutput)
  requiring the ccp knowledge so that it can call
  IpStartOutput()...  The end result is that the whole IP
  output queue gets dumped into the modem output queue
  and a pile of physical writes are done prematurely.  This
  makes the (original) code in main() actually work in that
  it would not bother selecting() on the tun descriptor when
  our modem queue length was 20 or greater.  Instead, we now
  make that decision based on the overall queue length.

  This will need improvement later.
1998-02-23 00:38:44 +00:00

272 lines
7.0 KiB
C

/*-
* Copyright (c) 1997 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.
*
* $Id: server.c,v 1.16.2.7 1998/02/18 20:39:08 brian Exp $
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/in_systm.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <termios.h>
#include <unistd.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "loadalias.h"
#include "defs.h"
#include "vars.h"
#include "descriptor.h"
#include "server.h"
#include "id.h"
#include "prompt.h"
#include "timer.h"
#include "auth.h"
static int
server_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
{
struct server *s = descriptor2server(d);
LogPrintf(LogDEBUG, "descriptor2server; %p -> %p\n", d, s);
if (r && s->fd >= 0) {
if (*n < s->fd + 1)
*n = s->fd + 1;
FD_SET(s->fd, r);
return 1;
}
return 0;
}
static int
server_IsSet(struct descriptor *d, fd_set *fdset)
{
struct server *s = descriptor2server(d);
LogPrintf(LogDEBUG, "descriptor2server; %p -> %p\n", d, s);
return s->fd >= 0 && FD_ISSET(s->fd, fdset);
}
#define IN_SIZE sizeof(struct sockaddr_in)
#define UN_SIZE sizeof(struct sockaddr_in)
#define ADDRSZ (IN_SIZE > UN_SIZE ? IN_SIZE : UN_SIZE)
static void
server_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
{
struct server *s = descriptor2server(d);
char hisaddr[ADDRSZ];
struct sockaddr *sa = (struct sockaddr *)hisaddr;
struct sockaddr_in *sin = (struct sockaddr_in *)hisaddr;
int ssize = ADDRSZ, wfd;
LogPrintf(LogDEBUG, "descriptor2server; %p -> %p\n", d, s);
wfd = accept(s->fd, sa, &ssize);
if (wfd < 0) {
LogPrintf(LogERROR, "server_Read: accept(): %s\n", strerror(errno));
return;
}
switch (sa->sa_family) {
case AF_LOCAL:
LogPrintf(LogPHASE, "Connected to local client.\n");
break;
case AF_INET:
if (ntohs(sin->sin_port) < 1024) {
LogPrintf(LogALERT, "Rejected client connection from %s:%u"
"(invalid port number) !\n",
inet_ntoa(sin->sin_addr), ntohs(sin->sin_port));
close(wfd);
return;
}
LogPrintf(LogPHASE, "Connected to client from %s:%u\n",
inet_ntoa(sin->sin_addr), sin->sin_port);
break;
default:
write(wfd, "Unrecognised access !\n", 22);
close(wfd);
return;
}
if (!prompt_Init(&prompt, wfd)) {
write(wfd, "Connection already in use.\n", 27);
close(wfd);
} else {
LocalAuthInit();
IsInteractive(1);
prompt_Display(&prompt, bundle);
}
}
static void
server_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
{
/* We never want to write here ! */
LogPrintf(LogERROR, "server_Write: Internal error: Bad call !\n");
}
struct server server = {
{
SERVER_DESCRIPTOR,
NULL,
server_UpdateSet,
server_IsSet,
server_Read,
server_Write
},
-1
};
static struct sockaddr_un ifsun;
static char *rm;
int
ServerLocalOpen(const char *name, mode_t mask)
{
int s;
if (VarLocalAuth == LOCAL_DENY) {
LogPrintf(LogWARN, "Local: Can't open socket %s: No password "
"in ppp.secret\n", name);
return 1;
}
if (mode & MODE_INTER) {
LogPrintf(LogWARN, "Local: Can't open socket in interactive mode\n");
return 1;
}
memset(&ifsun, '\0', sizeof ifsun);
ifsun.sun_len = strlen(name);
if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
LogPrintf(LogERROR, "Local: %s: Path too long\n", name);
return 2;
}
ifsun.sun_family = AF_LOCAL;
strcpy(ifsun.sun_path, name);
s = ID0socket(PF_LOCAL, SOCK_STREAM, 0);
if (s < 0) {
LogPrintf(LogERROR, "Local: socket: %s\n", strerror(errno));
return 3;
}
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
if (mask != (mode_t)-1)
mask = umask(mask);
if (bind(s, (struct sockaddr *)&ifsun, sizeof ifsun) < 0) {
if (mask != (mode_t)-1)
umask(mask);
LogPrintf(LogERROR, "Local: bind: %s\n", strerror(errno));
if (errno == EADDRINUSE)
prompt_Printf(&prompt, "Wait for a while, then try again.\n");
close(s);
return 4;
}
if (mask != (mode_t)-1)
umask(mask);
if (listen(s, 5) != 0) {
LogPrintf(LogERROR, "Local: Unable to listen to socket - BUNDLE overload?\n");
close(s);
ID0unlink(name);
return 5;
}
ServerClose();
server.fd = s;
rm = ifsun.sun_path;
LogPrintf(LogPHASE, "Listening at local socket %s.\n", name);
return 0;
}
int
ServerTcpOpen(int port)
{
struct sockaddr_in ifsin;
int s;
if (VarLocalAuth == LOCAL_DENY) {
LogPrintf(LogWARN, "Tcp: Can't open socket %d: No password "
"in ppp.secret\n", port);
return 6;
}
if (mode & MODE_INTER) {
LogPrintf(LogWARN, "Tcp: Can't open socket in interactive mode\n");
return 6;
}
s = ID0socket(PF_INET, SOCK_STREAM, 0);
if (s < 0) {
LogPrintf(LogERROR, "Tcp: socket: %s\n", strerror(errno));
return 7;
}
memset(&ifsin, '\0', sizeof ifsin);
ifsin.sin_family = AF_INET;
ifsin.sin_addr.s_addr = INADDR_ANY;
ifsin.sin_port = htons(port);
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
if (bind(s, (struct sockaddr *)&ifsin, sizeof ifsin) < 0) {
LogPrintf(LogERROR, "Tcp: bind: %s\n", strerror(errno));
if (errno == EADDRINUSE)
prompt_Printf(&prompt, "Wait for a while, then try again.\n");
close(s);
return 8;
}
if (listen(s, 5) != 0) {
LogPrintf(LogERROR, "Tcp: Unable to listen to socket - BUNDLE overload?\n");
close(s);
return 9;
}
ServerClose();
server.fd = s;
LogPrintf(LogPHASE, "Listening at port %d.\n", port);
return 0;
}
int
ServerClose()
{
if (server.fd >= 0) {
close(server.fd);
if (rm) {
ID0unlink(rm);
rm = 0;
}
server.fd = -1;
return 1;
}
return 0;
}