android_system_netd/PppController.cpp at ics · mitman/android_system_netd · GitHub

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

#include <stdlib.h>

#include <errno.h>

#include <fcntl.h>

#include <string.h>

#include <sys/socket.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <dirent.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#define LOG_TAG "PppController"

#include <cutils/log.h>

#include "PppController.h"

extern "C" int logwrap(int argc, const char **argv, int background);

PppController::PppController() {

mTtys = new TtyCollection();

mPid = 0;

}

PppController::~PppController() {

TtyCollection::iterator it;

for (it = mTtys->begin(); it != mTtys->end(); ++it) {

free(*it);

}

mTtys->clear();

}

int PppController::attachPppd(const char *tty, struct in_addr local,

struct in_addr remote, struct in_addr dns1,

struct in_addr dns2) {

pid_t pid;

if (mPid) {

LOGE("Multiple PPPD instances not currently supported");

errno = EBUSY;

return -1;

}

TtyCollection::iterator it;

for (it = mTtys->begin(); it != mTtys->end(); ++it) {

if (!strcmp(tty, *it)) {

break;

}

if (it == mTtys->end()) {

LOGE("Invalid tty '%s' specified", tty);

errno = -EINVAL;

return -1;

}

if ((pid = fork()) < 0) {

LOGE("fork failed (%s)", strerror(errno));

return -1;

}

if (!pid) {

char *l = strdup(inet_ntoa(local));

char *r = strdup(inet_ntoa(remote));

char *d1 = strdup(inet_ntoa(dns1));

char *d2 = strdup(inet_ntoa(dns2));

char dev[32];

char *lr;

asprintf(&lr, "%s:%s", l, r);

snprintf(dev, sizeof(dev), "/dev/%s", tty);

// TODO: Deal with pppd bailing out after 99999 seconds of being started

// but not getting a connection

if (execl("/system/bin/pppd", "/system/bin/pppd", "-detach", dev, "115200",

lr, "ms-dns", d1, "ms-dns", d2, "lcp-max-configure", "99999", (char *) NULL)) {

LOGE("execl failed (%s)", strerror(errno));

}

LOGE("Should never get here!");

return 0;

} else {

mPid = pid;

}

return 0;

}

int PppController::detachPppd(const char *tty) {

if (mPid == 0) {

LOGE("PPPD already stopped");

return 0;

}

LOGD("Stopping PPPD services on port %s", tty);

kill(mPid, SIGTERM);

waitpid(mPid, NULL, 0);

mPid = 0;

LOGD("PPPD services on port %s stopped", tty);

return 0;

}

TtyCollection *PppController::getTtyList() {

updateTtyList();

return mTtys;

}

int PppController::updateTtyList() {

TtyCollection::iterator it;

for (it = mTtys->begin(); it != mTtys->end(); ++it) {

free(*it);

}

mTtys->clear();

DIR *d = opendir("/sys/class/tty");

if (!d) {

LOGE("Error opening /sys/class/tty (%s)", strerror(errno));

return -1;

}

struct dirent *de;

while ((de = readdir(d))) {

if (de->d_name[0] == '.')

continue;

if ((!strncmp(de->d_name, "tty", 3)) && (strlen(de->d_name) > 3)) {

mTtys->push_back(strdup(de->d_name));

}

closedir(d);

return 0;

}

android_system_netd/PppController.cpp at ics · mitman/android_system_netd · GitHub

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