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