mirror of
https://git.kernel.org/pub/scm/bluetooth/bluez.git
synced 2024-12-02 08:34:26 +08:00
152 lines
2.7 KiB
C
152 lines
2.7 KiB
C
/*
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*
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* BlueZ - Bluetooth protocol stack for Linux
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*
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* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
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* Copyright (C) 2002-2008 Marcel Holtmann <marcel@holtmann.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <setjmp.h>
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#include <string.h>
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#include "lib.h"
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#define MS_PPP 2
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#define MS_SUCCESS 1
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#define MS_FAILED -1
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#define MS_TIMEOUT -2
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static sigjmp_buf jmp;
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static int retry;
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static int timeout;
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static void sig_alarm(int sig)
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{
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siglongjmp(jmp, MS_TIMEOUT);
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}
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static int w4_str(int fd, char *str)
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{
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char buf[40];
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int r, len = 0;
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while (1) {
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r = read(fd, buf + len, sizeof(buf) - len - 1);
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if (r < 0) {
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if (errno == EINTR || errno == EAGAIN)
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continue;
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break;
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}
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if (!r)
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break;
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len += r;
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if (len < strlen(str))
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continue;
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buf[len] = 0;
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if (strstr(buf, str))
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return MS_SUCCESS;
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/* Detect PPP */
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if (strchr(buf, '~'))
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return MS_PPP;
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}
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return MS_FAILED;
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}
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static int ms_server(int fd)
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{
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switch (w4_str(fd, "CLIENT")) {
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case MS_SUCCESS:
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write_n(fd, "CLIENTSERVER", 12);
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case MS_PPP:
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return MS_SUCCESS;
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default:
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return MS_FAILED;
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}
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}
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static int ms_client(int fd)
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{
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write_n(fd, "CLIENT", 6);
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return w4_str(fd, "CLIENTSERVER");
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}
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int ms_dun(int fd, int server, int timeo)
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{
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sig_t osig;
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retry = 4;
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timeout = timeo;
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if (!server)
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timeout /= retry;
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osig = signal(SIGALRM, sig_alarm);
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while (1) {
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int r = sigsetjmp(jmp, 1);
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if (r) {
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if (r == MS_TIMEOUT && !server && --retry)
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continue;
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alarm(0);
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signal(SIGALRM, osig);
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switch (r) {
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case MS_SUCCESS:
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case MS_PPP:
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errno = 0;
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return 0;
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case MS_FAILED:
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errno = EPROTO;
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break;
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case MS_TIMEOUT:
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errno = ETIMEDOUT;
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break;
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}
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return -1;
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}
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alarm(timeout);
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if (server)
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r = ms_server(fd);
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else
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r = ms_client(fd);
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siglongjmp(jmp, r);
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}
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}
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