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156 lines
3.8 KiB
156 lines
3.8 KiB
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <dirent.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#define LOG_TAG "PppController"
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#include <log/log.h>
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#include "PppController.h"
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PppController::PppController() {
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mTtys = new TtyCollection();
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mPid = 0;
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}
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PppController::~PppController() {
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TtyCollection::iterator it;
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for (it = mTtys->begin(); it != mTtys->end(); ++it) {
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free(*it);
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}
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mTtys->clear();
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}
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int PppController::attachPppd(const char *tty, struct in_addr local,
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struct in_addr remote, struct in_addr dns1,
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struct in_addr dns2) {
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pid_t pid;
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if (mPid) {
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ALOGE("Multiple PPPD instances not currently supported");
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errno = EBUSY;
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return -1;
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}
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TtyCollection::iterator it;
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for (it = mTtys->begin(); it != mTtys->end(); ++it) {
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if (!strcmp(tty, *it)) {
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break;
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}
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}
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if (it == mTtys->end()) {
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ALOGE("Invalid tty '%s' specified", tty);
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errno = -EINVAL;
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return -1;
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}
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if ((pid = fork()) < 0) {
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ALOGE("fork failed (%s)", strerror(errno));
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return -1;
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}
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if (!pid) {
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char *l = strdup(inet_ntoa(local));
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char *r = strdup(inet_ntoa(remote));
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char *d1 = strdup(inet_ntoa(dns1));
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char *d2 = strdup(inet_ntoa(dns2));
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char dev[32];
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char *lr;
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asprintf(&lr, "%s:%s", l, r);
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free(l);
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free(r);
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snprintf(dev, sizeof(dev), "/dev/%s", tty);
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// TODO: Deal with pppd bailing out after 99999 seconds of being started
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// but not getting a connection
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if (execl("/system/bin/pppd", "/system/bin/pppd", "-detach", dev, "115200",
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lr, "ms-dns", d1, "ms-dns", d2, "lcp-max-configure", "99999", (char *) nullptr)) {
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ALOGE("execl failed (%s)", strerror(errno));
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}
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free(lr);
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free(d1);
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free(d2);
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ALOGE("Should never get here!");
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return 0;
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} else {
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mPid = pid;
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}
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return 0;
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}
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int PppController::detachPppd(const char *tty) {
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if (mPid == 0) {
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ALOGE("PPPD already stopped");
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return 0;
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}
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ALOGD("Stopping PPPD services on port %s", tty);
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kill(mPid, SIGTERM);
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waitpid(mPid, nullptr, 0);
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mPid = 0;
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ALOGD("PPPD services on port %s stopped", tty);
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return 0;
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}
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TtyCollection *PppController::getTtyList() {
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updateTtyList();
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return mTtys;
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}
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int PppController::updateTtyList() {
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TtyCollection::iterator it;
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for (it = mTtys->begin(); it != mTtys->end(); ++it) {
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free(*it);
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}
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mTtys->clear();
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DIR *d = opendir("/sys/class/tty");
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if (!d) {
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ALOGE("Error opening /sys/class/tty (%s)", strerror(errno));
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return -1;
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}
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struct dirent *de;
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while ((de = readdir(d))) {
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if (de->d_name[0] == '.')
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continue;
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if ((!strncmp(de->d_name, "tty", 3)) && (strlen(de->d_name) > 3)) {
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mTtys->push_back(strdup(de->d_name));
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}
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}
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closedir(d);
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return 0;
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}
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