FreeBSD-5.3/usr.sbin/ppp/server.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.
*
* $FreeBSD: src/usr.sbin/ppp/server.c,v 1.42 2002/08/27 20:11:58 brian Exp $
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/un.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <termios.h>
#include <unistd.h>
#include "log.h"
#include "descriptor.h"
#include "server.h"
#include "prompt.h"
#include "ncpaddr.h"
#include "probe.h"
static int
server_UpdateSet(struct fdescriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
{
struct server *s = descriptor2server(d);
struct prompt *p;
int sets;
sets = 0;
if (r && s->fd >= 0) {
if (*n < s->fd + 1)
*n = s->fd + 1;
FD_SET(s->fd, r);
log_Printf(LogTIMER, "server: fdset(r) %d\n", s->fd);
sets++;
}
for (p = log_PromptList(); p; p = p->next)
sets += descriptor_UpdateSet(&p->desc, r, w, e, n);
return sets;
}
static int
server_IsSet(struct fdescriptor *d, const fd_set *fdset)
{
struct server *s = descriptor2server(d);
struct prompt *p;
if (s->fd >= 0 && FD_ISSET(s->fd, fdset))
return 1;
for (p = log_PromptList(); p; p = p->next)
if (descriptor_IsSet(&p->desc, fdset))
return 1;
return 0;
}
static void
server_Read(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
{
struct server *s = descriptor2server(d);
struct sockaddr_storage ss;
struct sockaddr *sa = (struct sockaddr *)&ss;
struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
#ifndef NOINET6
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
#endif
int ssize = sizeof ss, wfd;
struct prompt *p;
struct ncpaddr addr;
if (s->fd >= 0 && FD_ISSET(s->fd, fdset)) {
wfd = accept(s->fd, sa, &ssize);
if (wfd < 0)
log_Printf(LogERROR, "server_Read: accept(): %s\n", strerror(errno));
else if (sa->sa_len == 0) {
close(wfd);
wfd = -1;
}
} else
wfd = -1;
if (wfd >= 0)
switch (sa->sa_family) {
case AF_LOCAL:
log_Printf(LogPHASE, "Connected to local client.\n");
break;
case AF_INET:
ncpaddr_setsa(&addr, sa);
if (ntohs(sin->sin_port) < 1024) {
log_Printf(LogALERT, "Rejected client connection from %s:%u"
"(invalid port number) !\n",
ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
close(wfd);
wfd = -1;
break;
}
log_Printf(LogPHASE, "Connected to client from %s:%u\n",
ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
break;
#ifndef NOINET6
case AF_INET6:
ncpaddr_setsa(&addr, sa);
if (ntohs(sin6->sin6_port) < 1024) {
log_Printf(LogALERT, "Rejected client connection from %s:%u"
"(invalid port number) !\n",
ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
close(wfd);
wfd = -1;
break;
}
log_Printf(LogPHASE, "Connected to client from %s:%u\n",
ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
break;
#endif
default:
write(wfd, "Unrecognised access !\n", 22);
close(wfd);
wfd = -1;
break;
}
if (wfd >= 0) {
if ((p = prompt_Create(s, bundle, wfd)) == NULL) {
write(wfd, "Connection refused.\n", 20);
close(wfd);
} else {
switch (sa->sa_family) {
case AF_LOCAL:
p->src.type = "local";
strncpy(p->src.from, s->cfg.sockname, sizeof p->src.from - 1);
p->src.from[sizeof p->src.from - 1] = '\0';
break;
case AF_INET:
p->src.type = "ip";
snprintf(p->src.from, sizeof p->src.from, "%s:%u",
ncpaddr_ntoa(&addr), ntohs(sin->sin_port));
break;
#ifndef NOINET6
case AF_INET6:
p->src.type = "ip6";
snprintf(p->src.from, sizeof p->src.from, "%s:%u",
ncpaddr_ntoa(&addr), ntohs(sin6->sin6_port));
break;
#endif
}
prompt_TtyCommandMode(p);
prompt_Required(p);
}
}
log_PromptListChanged = 0;
for (p = log_PromptList(); p; p = p->next)
if (descriptor_IsSet(&p->desc, fdset)) {
descriptor_Read(&p->desc, bundle, fdset);
if (log_PromptListChanged)
break;
}
}
static int
server_Write(struct fdescriptor *d, struct bundle *bundle, const fd_set *fdset)
{
/* We never want to write here ! */
log_Printf(LogALERT, "server_Write: Internal error: Bad call !\n");
return 0;
}
struct server server = {
{
SERVER_DESCRIPTOR,
server_UpdateSet,
server_IsSet,
server_Read,
server_Write
},
-1
};
enum server_stat
server_Reopen(struct bundle *bundle)
{
char name[sizeof server.cfg.sockname];
struct stat st;
u_short port;
mode_t mask;
enum server_stat ret;
if (server.cfg.sockname[0] != '\0') {
strcpy(name, server.cfg.sockname);
mask = server.cfg.mask;
server_Close(bundle);
if (server.cfg.sockname[0] != '\0' && stat(server.cfg.sockname, &st) == 0)
if (!(st.st_mode & S_IFSOCK) || unlink(server.cfg.sockname) != 0)
return SERVER_FAILED;
ret = server_LocalOpen(bundle, name, mask);
} else if (server.cfg.port != 0) {
port = server.cfg.port;
server_Close(bundle);
ret = server_TcpOpen(bundle, port);
} else
ret = SERVER_UNSET;
return ret;
}
enum server_stat
server_LocalOpen(struct bundle *bundle, const char *name, mode_t mask)
{
struct sockaddr_un ifsun;
mode_t oldmask;
int s;
oldmask = (mode_t)-1; /* Silence compiler */
if (server.cfg.sockname && !strcmp(server.cfg.sockname, name))
server_Close(bundle);
memset(&ifsun, '\0', sizeof ifsun);
ifsun.sun_len = strlen(name);
if (ifsun.sun_len > sizeof ifsun.sun_path - 1) {
log_Printf(LogERROR, "Local: %s: Path too long\n", name);
return SERVER_INVALID;
}
ifsun.sun_family = AF_LOCAL;
strcpy(ifsun.sun_path, name);
s = socket(PF_LOCAL, SOCK_STREAM, 0);
if (s < 0) {
log_Printf(LogERROR, "Local: socket: %s\n", strerror(errno));
goto failed;
}
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
if (mask != (mode_t)-1)
oldmask = umask(mask);
if (bind(s, (struct sockaddr *)&ifsun, sizeof ifsun) < 0) {
if (mask != (mode_t)-1)
umask(oldmask);
log_Printf(LogWARN, "Local: bind: %s\n", strerror(errno));
close(s);
goto failed;
}
if (mask != (mode_t)-1)
umask(oldmask);
if (listen(s, 5) != 0) {
log_Printf(LogERROR, "Local: Unable to listen to socket -"
" BUNDLE overload?\n");
close(s);
unlink(name);
goto failed;
}
server_Close(bundle);
server.fd = s;
server.cfg.port = 0;
strncpy(server.cfg.sockname, ifsun.sun_path, sizeof server.cfg.sockname - 1);
server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
server.cfg.mask = mask;
log_Printf(LogPHASE, "Listening at local socket %s.\n", name);
return SERVER_OK;
failed:
if (server.fd == -1) {
server.fd = -1;
server.cfg.port = 0;
strncpy(server.cfg.sockname, ifsun.sun_path,
sizeof server.cfg.sockname - 1);
server.cfg.sockname[sizeof server.cfg.sockname - 1] = '\0';
server.cfg.mask = mask;
}
return SERVER_FAILED;
}
enum server_stat
server_TcpOpen(struct bundle *bundle, u_short port)
{
struct sockaddr_storage ss;
struct sockaddr_in *sin = (struct sockaddr_in *)&ss;
#ifndef NOINET6
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&ss;
#endif
int s, sz;
if (server.cfg.port == port)
server_Close(bundle);
if (port == 0)
return SERVER_INVALID;
memset(&ss, '\0', sizeof ss);
#ifndef NOINET6
if (probe.ipv6_available) {
sin6->sin6_family = AF_INET6;
sin6->sin6_port = htons(port);
sin6->sin6_len = (u_int8_t)sizeof ss;
sz = sizeof *sin6;
s = socket(PF_INET6, SOCK_STREAM, 0);
} else
#endif
{
sin->sin_family = AF_INET;
sin->sin_port = htons(port);
sin->sin_len = (u_int8_t)sizeof ss;
sin->sin_addr.s_addr = INADDR_ANY;
sz = sizeof *sin;
s = socket(PF_INET, SOCK_STREAM, 0);
}
if (s < 0) {
log_Printf(LogERROR, "Tcp: socket: %s\n", strerror(errno));
goto failed;
}
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &s, sizeof s);
if (bind(s, (struct sockaddr *)&ss, sz) < 0) {
log_Printf(LogWARN, "Tcp: bind: %s\n", strerror(errno));
close(s);
goto failed;
}
if (listen(s, 5) != 0) {
log_Printf(LogERROR, "Tcp: Unable to listen to socket: %s\n",
strerror(errno));
close(s);
goto failed;
}
server_Close(bundle);
server.fd = s;
server.cfg.port = port;
*server.cfg.sockname = '\0';
server.cfg.mask = 0;
log_Printf(LogPHASE, "Listening at port %d.\n", port);
return SERVER_OK;
failed:
if (server.fd == -1) {
server.fd = -1;
server.cfg.port = port;
*server.cfg.sockname = '\0';
server.cfg.mask = 0;
}
return SERVER_FAILED;
}
int
server_Close(struct bundle *bundle)
{
if (server.fd >= 0) {
if (*server.cfg.sockname != '\0') {
struct sockaddr_un un;
int sz = sizeof un;
if (getsockname(server.fd, (struct sockaddr *)&un, &sz) == 0 &&
un.sun_family == AF_LOCAL && sz == sizeof un)
unlink(un.sun_path);
}
close(server.fd);
server.fd = -1;
/* Drop associated prompts */
log_DestroyPrompts(&server);
return 1;
}
return 0;
}
int
server_Clear(struct bundle *bundle)
{
int ret;
ret = server_Close(bundle);
server.fd = -1;
server.cfg.port = 0;
*server.cfg.sockname = '\0';
server.cfg.mask = 0;
return ret;
}