PppController.cpp revision 1881762f345d011d079ee318d31f0a8d8ee5891e 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdlib.h>
18#include <errno.h>
19#include <fcntl.h>
20
21#include <sys/socket.h>
22#include <sys/stat.h>
23#include <sys/types.h>
24#include <sys/wait.h>
25
26#include <dirent.h>
27
28#include <netinet/in.h>
29#include <arpa/inet.h>
30
31#define LOG_TAG "PppController"
32#include <cutils/log.h>
33
34#include "PppController.h"
35
36extern "C" int logwrap(int argc, const char **argv, int background);
37
38PppController::PppController() {
39    mTtys = new TtyCollection();
40    mPid = 0;
41}
42
43PppController::~PppController() {
44    TtyCollection::iterator it;
45
46    for (it = mTtys->begin(); it != mTtys->end(); ++it) {
47        free(*it);
48    }
49    mTtys->clear();
50}
51
52int PppController::attachPppd(const char *tty, struct in_addr local,
53                              struct in_addr remote) {
54    pid_t pid;
55
56    if (mPid) {
57        LOGE("Multiple PPPD instances not currently supported");
58        errno = EBUSY;
59        return -1;
60    }
61
62    TtyCollection::iterator it;
63    for (it = mTtys->begin(); it != mTtys->end(); ++it) {
64        if (!strcmp(tty, *it)) {
65            break;
66        }
67    }
68    if (it == mTtys->end()) {
69        LOGE("Invalid tty '%s' specified", tty);
70        errno = -EINVAL;
71        return -1;
72    }
73
74    if ((pid = fork()) < 0) {
75        LOGE("fork failed (%s)", strerror(errno));
76        return -1;
77    }
78
79    if (!pid) {
80        char *l = strdup(inet_ntoa(local));
81        char *r = strdup(inet_ntoa(remote));
82        char dev[32];
83        char *lr;
84
85        asprintf(&lr, "%s:%s", l, r);
86
87        snprintf(dev, sizeof(dev), "/dev/%s", tty);
88
89        // TODO: Deal with pppd bailing out after 99999 seconds of being started
90        // but not getting a connection
91        if (execl("/system/bin/pppd", "/system/bin/pppd", "-detach", dev,
92                  "115200", lr, "debug", "lcp-max-configure", "99999", (char *) NULL)) {
93            LOGE("execl failed (%s)", strerror(errno));
94        }
95        LOGE("Should never get here!");
96        return 0;
97    } else {
98        mPid = pid;
99    }
100    return 0;
101}
102
103int PppController::detachPppd(const char *tty) {
104
105    if (mPid == 0) {
106        LOGE("PPPD already stopped");
107        return 0;
108    }
109
110    LOGD("Stopping PPPD services on port %s", tty);
111    kill(mPid, SIGTERM);
112    waitpid(mPid, NULL, 0);
113    mPid = 0;
114    LOGD("PPPD services on port %s stopped", tty);
115    return 0;
116}
117
118TtyCollection *PppController::getTtyList() {
119    updateTtyList();
120    return mTtys;
121}
122
123int PppController::updateTtyList() {
124    TtyCollection::iterator it;
125
126    for (it = mTtys->begin(); it != mTtys->end(); ++it) {
127        free(*it);
128    }
129    mTtys->clear();
130
131    DIR *d = opendir("/sys/class/tty");
132    if (!d) {
133        LOGE("Error opening /sys/class/tty (%s)", strerror(errno));
134        return -1;
135    }
136
137    struct dirent *de;
138    while ((de = readdir(d))) {
139        if (de->d_name[0] == '.')
140            continue;
141        if ((!strncmp(de->d_name, "tty", 3)) && (strlen(de->d_name) > 3)) {
142            mTtys->push_back(strdup(de->d_name));
143        }
144    }
145    closedir(d);
146    return 0;
147}
148
149