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 39 PppController::PppController() { 40 mTtys = new TtyCollection(); 41 mPid = 0; 42 } 43 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 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 } 106 107 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 } 121 122 TtyCollection *PppController::getTtyList() { 123 updateTtyList(); 124 return mTtys; 125 } 126 127 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
