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 #include <string.h>
21
22 #include <sys/socket.h>
23 #include <sys/stat.h>
24 #include <sys/types.h>
25 #include <sys/wait.h>
26
27 #include <dirent.h>
28
29 #include <netinet/in.h>
30 #include <arpa/inet.h>
31
32 #define LOG_TAG "PppController"
33 #include <cutils/log.h>
34
35 #include "PppController.h"
36
37 extern "C" int logwrap(int argc, const char **argv, int background);
38
PppController()39 PppController::PppController() {
40 mTtys = new TtyCollection();
41 mPid = 0;
42 }
43
~PppController()44 PppController::~PppController() {
45 TtyCollection::iterator it;
46
47 for (it = mTtys->begin(); it != mTtys->end(); ++it) {
48 free(*it);
49 }
50 mTtys->clear();
51 }
52
attachPppd(const char * tty,struct in_addr local,struct in_addr remote,struct in_addr dns1,struct in_addr dns2)53 int PppController::attachPppd(const char *tty, struct in_addr local,
54 struct in_addr remote, struct in_addr dns1,
55 struct in_addr dns2) {
56 pid_t pid;
57
58 if (mPid) {
59 LOGE("Multiple PPPD instances not currently supported");
60 errno = EBUSY;
61 return -1;
62 }
63
64 TtyCollection::iterator it;
65 for (it = mTtys->begin(); it != mTtys->end(); ++it) {
66 if (!strcmp(tty, *it)) {
67 break;
68 }
69 }
70 if (it == mTtys->end()) {
71 LOGE("Invalid tty '%s' specified", tty);
72 errno = -EINVAL;
73 return -1;
74 }
75
76 if ((pid = fork()) < 0) {
77 LOGE("fork failed (%s)", strerror(errno));
78 return -1;
79 }
80
81 if (!pid) {
82 char *l = strdup(inet_ntoa(local));
83 char *r = strdup(inet_ntoa(remote));
84 char *d1 = strdup(inet_ntoa(dns1));
85 char *d2 = strdup(inet_ntoa(dns2));
86 char dev[32];
87 char *lr;
88
89 asprintf(&lr, "%s:%s", l, r);
90
91 snprintf(dev, sizeof(dev), "/dev/%s", tty);
92
93 // TODO: Deal with pppd bailing out after 99999 seconds of being started
94 // but not getting a connection
95 if (execl("/system/bin/pppd", "/system/bin/pppd", "-detach", dev, "115200",
96 lr, "ms-dns", d1, "ms-dns", d2, "lcp-max-configure", "99999", (char *) NULL)) {
97 LOGE("execl failed (%s)", strerror(errno));
98 }
99 LOGE("Should never get here!");
100 return 0;
101 } else {
102 mPid = pid;
103 }
104 return 0;
105 }
106
detachPppd(const char * tty)107 int PppController::detachPppd(const char *tty) {
108
109 if (mPid == 0) {
110 LOGE("PPPD already stopped");
111 return 0;
112 }
113
114 LOGD("Stopping PPPD services on port %s", tty);
115 kill(mPid, SIGTERM);
116 waitpid(mPid, NULL, 0);
117 mPid = 0;
118 LOGD("PPPD services on port %s stopped", tty);
119 return 0;
120 }
121
getTtyList()122 TtyCollection *PppController::getTtyList() {
123 updateTtyList();
124 return mTtys;
125 }
126
updateTtyList()127 int PppController::updateTtyList() {
128 TtyCollection::iterator it;
129
130 for (it = mTtys->begin(); it != mTtys->end(); ++it) {
131 free(*it);
132 }
133 mTtys->clear();
134
135 DIR *d = opendir("/sys/class/tty");
136 if (!d) {
137 LOGE("Error opening /sys/class/tty (%s)", strerror(errno));
138 return -1;
139 }
140
141 struct dirent *de;
142 while ((de = readdir(d))) {
143 if (de->d_name[0] == '.')
144 continue;
145 if ((!strncmp(de->d_name, "tty", 3)) && (strlen(de->d_name) > 3)) {
146 mTtys->push_back(strdup(de->d_name));
147 }
148 }
149 closedir(d);
150 return 0;
151 }
152