freebsd-dev/usr.sbin/bluetooth/rfcomm_pppd/rfcomm_pppd.c
2009-02-04 22:04:06 +00:00

472 lines
12 KiB
C

/*
* rfcomm_pppd.c
*/
/*-
* Copyright (c) 2001-2008 Maksim Yevmenkin <m_evmenkin@yahoo.com>
* 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: rfcomm_pppd.c,v 1.5 2003/09/07 18:32:11 max Exp $
* $FreeBSD$
*/
#include <bluetooth.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <sdp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#define RFCOMM_PPPD "rfcomm_pppd"
int rfcomm_channel_lookup (bdaddr_t const *local,
bdaddr_t const *remote,
int service, int *channel, int *error);
static void exec_ppp (int s, char *unit, char *label);
static void sighandler (int s);
static void usage (void);
static int done;
/* Main */
int
main(int argc, char *argv[])
{
struct sockaddr_rfcomm sock_addr;
char *label = NULL, *unit = NULL, *ep = NULL;
bdaddr_t addr;
int s, channel, detach, server, service,
regdun, regsp;
pid_t pid;
memcpy(&addr, NG_HCI_BDADDR_ANY, sizeof(addr));
channel = 0;
detach = 1;
server = 0;
service = 0;
regdun = 0;
regsp = 0;
/* Parse command line arguments */
while ((s = getopt(argc, argv, "a:cC:dDhl:sSu:")) != -1) {
switch (s) {
case 'a': /* BDADDR */
if (!bt_aton(optarg, &addr)) {
struct hostent *he = NULL;
if ((he = bt_gethostbyname(optarg)) == NULL)
errx(1, "%s: %s", optarg, hstrerror(h_errno));
memcpy(&addr, he->h_addr, sizeof(addr));
}
break;
case 'c': /* client */
server = 0;
break;
case 'C': /* RFCOMM channel */
channel = strtoul(optarg, &ep, 10);
if (*ep != '\0') {
channel = 0;
switch (tolower(optarg[0])) {
case 'd': /* DialUp Networking */
service = SDP_SERVICE_CLASS_DIALUP_NETWORKING;
break;
case 'l': /* LAN Access Using PPP */
service = SDP_SERVICE_CLASS_LAN_ACCESS_USING_PPP;
break;
}
}
break;
case 'd': /* do not detach */
detach = 0;
break;
case 'D': /* Register DUN service as well as LAN service */
regdun = 1;
break;
case 'l': /* PPP label */
label = optarg;
break;
case 's': /* server */
server = 1;
break;
case 'S': /* Register SP service as well as LAN service */
regsp = 1;
break;
case 'u': /* PPP -unit option */
strtoul(optarg, &ep, 10);
if (*ep != '\0')
usage();
/* NOT REACHED */
unit = optarg;
break;
case 'h':
default:
usage();
/* NOT REACHED */
}
}
/* Check if we got everything we wanted */
if (label == NULL)
errx(1, "Must specify PPP label");
if (!server) {
if (memcmp(&addr, NG_HCI_BDADDR_ANY, sizeof(addr)) == 0)
errx(1, "Must specify server BD_ADDR");
/* Check channel, if was not set then obtain it via SDP */
if (channel == 0 && service != 0)
if (rfcomm_channel_lookup(NULL, &addr, service,
&channel, &s) != 0)
errc(1, s, "Could not obtain RFCOMM channel");
}
if (channel <= 0 || channel > 30)
errx(1, "Invalid RFCOMM channel number %d", channel);
openlog(RFCOMM_PPPD, LOG_PID | LOG_PERROR | LOG_NDELAY, LOG_USER);
if (detach && daemon(0, 0) < 0) {
syslog(LOG_ERR, "Could not daemon(0, 0). %s (%d)",
strerror(errno), errno);
exit(1);
}
s = socket(PF_BLUETOOTH, SOCK_STREAM, BLUETOOTH_PROTO_RFCOMM);
if (s < 0) {
syslog(LOG_ERR, "Could not create socket. %s (%d)",
strerror(errno), errno);
exit(1);
}
if (server) {
struct sigaction sa;
void *ss = NULL;
sdp_lan_profile_t lan;
/* Install signal handler */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sighandler;
if (sigaction(SIGTERM, &sa, NULL) < 0) {
syslog(LOG_ERR, "Could not sigaction(SIGTERM). %s (%d)",
strerror(errno), errno);
exit(1);
}
if (sigaction(SIGHUP, &sa, NULL) < 0) {
syslog(LOG_ERR, "Could not sigaction(SIGHUP). %s (%d)",
strerror(errno), errno);
exit(1);
}
if (sigaction(SIGINT, &sa, NULL) < 0) {
syslog(LOG_ERR, "Could not sigaction(SIGINT). %s (%d)",
strerror(errno), errno);
exit(1);
}
sa.sa_handler = SIG_IGN;
sa.sa_flags = SA_NOCLDWAIT;
if (sigaction(SIGCHLD, &sa, NULL) < 0) {
syslog(LOG_ERR, "Could not sigaction(SIGCHLD). %s (%d)",
strerror(errno), errno);
exit(1);
}
/* bind socket and listen for incoming connections */
sock_addr.rfcomm_len = sizeof(sock_addr);
sock_addr.rfcomm_family = AF_BLUETOOTH;
memcpy(&sock_addr.rfcomm_bdaddr, &addr,
sizeof(sock_addr.rfcomm_bdaddr));
sock_addr.rfcomm_channel = channel;
if (bind(s, (struct sockaddr *) &sock_addr,
sizeof(sock_addr)) < 0) {
syslog(LOG_ERR, "Could not bind socket. %s (%d)",
strerror(errno), errno);
exit(1);
}
if (listen(s, 10) < 0) {
syslog(LOG_ERR, "Could not listen on socket. %s (%d)",
strerror(errno), errno);
exit(1);
}
ss = sdp_open_local(NULL);
if (ss == NULL) {
syslog(LOG_ERR, "Unable to create local SDP session");
exit(1);
}
if (sdp_error(ss) != 0) {
syslog(LOG_ERR, "Unable to open local SDP session. " \
"%s (%d)", strerror(sdp_error(ss)),
sdp_error(ss));
exit(1);
}
memset(&lan, 0, sizeof(lan));
lan.server_channel = channel;
if (sdp_register_service(ss,
SDP_SERVICE_CLASS_LAN_ACCESS_USING_PPP,
&addr, (void *) &lan, sizeof(lan), NULL) != 0) {
syslog(LOG_ERR, "Unable to register LAN service with " \
"local SDP daemon. %s (%d)",
strerror(sdp_error(ss)), sdp_error(ss));
exit(1);
}
/*
* Register DUN (Dial-Up Networking) service on the same
* RFCOMM channel if requested. There is really no good reason
* to not to support this. AT-command exchange can be faked
* with chat script in ppp.conf
*/
if (regdun) {
sdp_dun_profile_t dun;
memset(&dun, 0, sizeof(dun));
dun.server_channel = channel;
if (sdp_register_service(ss,
SDP_SERVICE_CLASS_DIALUP_NETWORKING,
&addr, (void *) &dun, sizeof(dun),
NULL) != 0) {
syslog(LOG_ERR, "Unable to register DUN " \
"service with local SDP daemon. " \
"%s (%d)", strerror(sdp_error(ss)),
sdp_error(ss));
exit(1);
}
}
/*
* Register SP (Serial Port) service on the same RFCOMM channel
* if requested. It appears that some cell phones are using so
* called "callback mechanism". In this scenario user is trying
* to connect his cell phone to the Internet, and, user's host
* computer is acting as the gateway server. It seems that it
* is not possible to tell the phone to just connect and start
* using the LAN service. Instead the user's host computer must
* "jump start" the phone by connecting to the phone's SP
* service. What happens next is the phone kills the existing
* connection and opens another connection back to the user's
* host computer. The phone really wants to use LAN service,
* but for whatever reason it looks for SP service on the
* user's host computer. This brain damaged behavior was
* reported for Nokia 6600 and Sony/Ericsson P900. Both phones
* are Symbian-based phones. Perhaps this is a Symbian problem?
*/
if (regsp) {
sdp_sp_profile_t sp;
memset(&sp, 0, sizeof(sp));
sp.server_channel = channel;
if (sdp_register_service(ss,
SDP_SERVICE_CLASS_SERIAL_PORT,
&addr, (void *) &sp, sizeof(sp),
NULL) != 0) {
syslog(LOG_ERR, "Unable to register SP " \
"service with local SDP daemon. " \
"%s (%d)", strerror(sdp_error(ss)),
sdp_error(ss));
exit(1);
}
}
for (done = 0; !done; ) {
socklen_t len = sizeof(sock_addr);
int s1 = accept(s, (struct sockaddr *) &sock_addr, &len);
if (s1 < 0) {
syslog(LOG_ERR, "Could not accept connection " \
"on socket. %s (%d)", strerror(errno),
errno);
exit(1);
}
pid = fork();
if (pid == (pid_t) -1) {
syslog(LOG_ERR, "Could not fork(). %s (%d)",
strerror(errno), errno);
exit(1);
}
if (pid == 0) {
sdp_close(ss);
close(s);
/* Reset signal handler */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_DFL;
sigaction(SIGTERM, &sa, NULL);
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGCHLD, &sa, NULL);
/* Become daemon */
daemon(0, 0);
/*
* XXX Make sure user does not shoot himself
* in the foot. Do not pass unit option to the
* PPP when operating in the server mode.
*/
exec_ppp(s1, NULL, label);
} else
close(s1);
}
} else {
sock_addr.rfcomm_len = sizeof(sock_addr);
sock_addr.rfcomm_family = AF_BLUETOOTH;
memcpy(&sock_addr.rfcomm_bdaddr, NG_HCI_BDADDR_ANY,
sizeof(sock_addr.rfcomm_bdaddr));
sock_addr.rfcomm_channel = 0;
if (bind(s, (struct sockaddr *) &sock_addr,
sizeof(sock_addr)) < 0) {
syslog(LOG_ERR, "Could not bind socket. %s (%d)",
strerror(errno), errno);
exit(1);
}
memcpy(&sock_addr.rfcomm_bdaddr, &addr,
sizeof(sock_addr.rfcomm_bdaddr));
sock_addr.rfcomm_channel = channel;
if (connect(s, (struct sockaddr *) &sock_addr,
sizeof(sock_addr)) < 0) {
syslog(LOG_ERR, "Could not connect socket. %s (%d)",
strerror(errno), errno);
exit(1);
}
exec_ppp(s, unit, label);
}
exit(0);
} /* main */
/*
* Redirects stdin/stdout to s, stderr to /dev/null and exec
* 'ppp -direct -quiet [-unit N] label'. Never returns.
*/
static void
exec_ppp(int s, char *unit, char *label)
{
char ppp[] = "/usr/sbin/ppp";
char *ppp_args[] = { ppp, "-direct", "-quiet",
NULL, NULL, NULL, NULL };
close(0);
if (dup(s) < 0) {
syslog(LOG_ERR, "Could not dup(0). %s (%d)",
strerror(errno), errno);
exit(1);
}
close(1);
if (dup(s) < 0) {
syslog(LOG_ERR, "Could not dup(1). %s (%d)",
strerror(errno), errno);
exit(1);
}
close(2);
open("/dev/null", O_RDWR);
if (unit != NULL) {
ppp_args[3] = "-unit";
ppp_args[4] = unit;
ppp_args[5] = label;
} else
ppp_args[3] = label;
if (execv(ppp, ppp_args) < 0) {
syslog(LOG_ERR, "Could not exec(%s -direct -quiet%s%s %s). " \
"%s (%d)", ppp, (unit != NULL)? " -unit " : "",
(unit != NULL)? unit : "", label,
strerror(errno), errno);
exit(1);
}
} /* run_ppp */
/* Signal handler */
static void
sighandler(int s)
{
done = 1;
} /* sighandler */
/* Display usage and exit */
static void
usage(void)
{
fprintf(stdout,
"Usage: %s options\n" \
"Where options are:\n" \
"\t-a address Address to listen on or connect to (required for client)\n" \
"\t-c Act as a clinet (default)\n" \
"\t-C channel RFCOMM channel to listen on or connect to (required)\n" \
"\t-d Run in foreground\n" \
"\t-D Register Dial-Up Networking service (server mode only)\n" \
"\t-l label Use PPP label (required)\n" \
"\t-s Act as a server\n" \
"\t-S Register Serial Port service (server mode only)\n" \
"\t-u N Tell PPP to operate on /dev/tunN (client mode only)\n" \
"\t-h Display this message\n", RFCOMM_PPPD);
exit(255);
} /* usage */