Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2009 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 <stdio.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <stdarg.h> |
| 20 | #include <string.h> |
| 21 | #include <errno.h> |
| 22 | #include <sys/types.h> |
| 23 | #include <sys/socket.h> |
| 24 | #include <sys/poll.h> |
| 25 | #include <sys/wait.h> |
| 26 | #include <netdb.h> |
| 27 | #include <signal.h> |
| 28 | #include <unistd.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <time.h> |
| 31 | |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 32 | #ifdef ANDROID_CHANGES |
| 33 | #include <android/log.h> |
| 34 | #include <cutils/sockets.h> |
| 35 | #endif |
| 36 | |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 37 | #include "mtpd.h" |
| 38 | |
| 39 | int the_socket = -1; |
| 40 | |
| 41 | extern struct protocol l2tp; |
Chia-chi Yeh | 063bb92 | 2009-06-15 14:43:38 +0800 | [diff] [blame^] | 42 | extern struct protocol pptp; |
| 43 | static struct protocol *protocols[] = {&l2tp, &pptp, NULL}; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 44 | static struct protocol *the_protocol; |
| 45 | |
| 46 | static int pppd_argc; |
| 47 | static char **pppd_argv; |
| 48 | static pid_t pppd_pid; |
| 49 | |
| 50 | /* We redirect signals to a pipe in order to prevent race conditions. */ |
| 51 | static int signals[2]; |
| 52 | |
| 53 | static void interrupt(int signal) |
| 54 | { |
| 55 | write(signals[1], &signal, sizeof(int)); |
| 56 | } |
| 57 | |
| 58 | static int initialize(int argc, char **argv) |
| 59 | { |
| 60 | int timeout = 0; |
| 61 | int i; |
| 62 | |
| 63 | for (i = 2; i < argc; ++i) { |
| 64 | if (!argv[i][0]) { |
| 65 | pppd_argc = argc - i - 1; |
| 66 | pppd_argv = &argv[i + 1]; |
| 67 | argc = i; |
| 68 | break; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | if (argc >= 2) { |
| 73 | for (i = 0; protocols[i]; ++i) { |
| 74 | if (!strcmp(argv[1], protocols[i]->name)) { |
| 75 | log_print(INFO, "Using protocol %s", protocols[i]->name); |
| 76 | the_protocol = protocols[i]; |
| 77 | timeout = the_protocol->connect(argc - 2, &argv[2]); |
| 78 | break; |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | if (!the_protocol || timeout == -USAGE_ERROR) { |
| 84 | printf("Usage: %s <protocol-args> '' <pppd-args>, " |
| 85 | "where protocol-args are one of:\n", argv[0]); |
| 86 | for (i = 0; protocols[i]; ++i) { |
| 87 | printf(" %s %s\n", protocols[i]->name, protocols[i]->usage); |
| 88 | } |
| 89 | exit(USAGE_ERROR); |
| 90 | } |
| 91 | return timeout; |
| 92 | } |
| 93 | |
| 94 | static void stop_pppd() |
| 95 | { |
| 96 | if (pppd_pid) { |
| 97 | log_print(INFO, "Sending signal to pppd (pid = %d)", pppd_pid); |
| 98 | kill(pppd_pid, SIGTERM); |
| 99 | sleep(5); |
| 100 | pppd_pid = 0; |
| 101 | } |
| 102 | } |
| 103 | |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 104 | #ifdef ANDROID_CHANGES |
| 105 | |
| 106 | static int get_control_and_arguments(int *argc, char ***argv) |
| 107 | { |
| 108 | static char *args[256]; |
| 109 | int control; |
| 110 | int i; |
| 111 | |
Chia-chi Yeh | 063bb92 | 2009-06-15 14:43:38 +0800 | [diff] [blame^] | 112 | if ((i = android_get_control_socket("mtpd")) == -1) { |
| 113 | return -1; |
| 114 | } |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 115 | log_print(DEBUG, "Waiting for control socket"); |
Chia-chi Yeh | 063bb92 | 2009-06-15 14:43:38 +0800 | [diff] [blame^] | 116 | if (listen(i, 1) == -1 || (control = accept(i, NULL, 0)) == -1) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 117 | log_print(FATAL, "Cannot get control socket"); |
| 118 | exit(SYSTEM_ERROR); |
| 119 | } |
| 120 | close(i); |
| 121 | fcntl(control, F_SETFD, FD_CLOEXEC); |
| 122 | |
| 123 | args[0] = (*argv)[0]; |
| 124 | for (i = 1; i < 256; ++i) { |
| 125 | unsigned char length; |
| 126 | if (recv(control, &length, 1, 0) != 1) { |
| 127 | log_print(FATAL, "Cannot get argument length"); |
| 128 | exit(SYSTEM_ERROR); |
| 129 | } |
| 130 | if (length == 0xFF) { |
| 131 | break; |
| 132 | } else { |
| 133 | int offset = 0; |
| 134 | args[i] = malloc(length + 1); |
| 135 | while (offset < length) { |
| 136 | int n = recv(control, &args[i][offset], length - offset, 0); |
| 137 | if (n > 0) { |
| 138 | offset += n; |
| 139 | } else { |
| 140 | log_print(FATAL, "Cannot get argument value"); |
| 141 | exit(SYSTEM_ERROR); |
| 142 | } |
| 143 | } |
| 144 | args[i][length] = 0; |
| 145 | } |
| 146 | } |
| 147 | log_print(DEBUG, "Received %d arguments", i - 1); |
| 148 | |
| 149 | *argc = i; |
| 150 | *argv = args; |
| 151 | return control; |
| 152 | } |
| 153 | |
| 154 | #endif |
| 155 | |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 156 | int main(int argc, char **argv) |
| 157 | { |
| 158 | struct pollfd pollfds[2]; |
| 159 | int timeout; |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 160 | int status; |
| 161 | #ifdef ANDROID_CHANGES |
| 162 | unsigned char code; |
| 163 | int control = get_control_and_arguments(&argc, &argv); |
| 164 | code = argc - 1; |
| 165 | send(control, &code, 1, 0); |
| 166 | #endif |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 167 | |
| 168 | srandom(time(NULL)); |
| 169 | |
| 170 | if (pipe(signals) == -1) { |
| 171 | log_print(FATAL, "Pipe() %s", strerror(errno)); |
| 172 | exit(SYSTEM_ERROR); |
| 173 | } |
| 174 | |
| 175 | signal(SIGHUP, interrupt); |
| 176 | signal(SIGINT, interrupt); |
| 177 | signal(SIGTERM, interrupt); |
| 178 | signal(SIGCHLD, interrupt); |
| 179 | signal(SIGPIPE, SIG_IGN); |
| 180 | atexit(stop_pppd); |
| 181 | |
| 182 | timeout = initialize(argc, argv); |
| 183 | pollfds[0].fd = signals[0]; |
| 184 | pollfds[0].events = POLLIN; |
| 185 | pollfds[1].fd = the_socket; |
| 186 | pollfds[1].events = POLLIN; |
| 187 | |
| 188 | while (timeout >= 0) { |
| 189 | if (poll(pollfds, 2, timeout ? timeout : -1) == -1 && errno != EINTR) { |
| 190 | log_print(FATAL, "Poll() %s", strerror(errno)); |
| 191 | exit(SYSTEM_ERROR); |
| 192 | } |
| 193 | if (pollfds[0].revents) { |
| 194 | break; |
| 195 | } |
| 196 | timeout = pollfds[1].revents ? |
| 197 | the_protocol->process() : the_protocol->timeout(); |
| 198 | } |
| 199 | |
| 200 | if (timeout < 0) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 201 | status = -timeout; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 202 | } else { |
| 203 | int signal; |
| 204 | read(signals[0], &signal, sizeof(int)); |
| 205 | log_print(INFO, "Received signal %d", signal); |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 206 | if (signal == SIGCHLD && waitpid(pppd_pid, &status, WNOHANG) == pppd_pid |
| 207 | && WIFEXITED(status)) { |
| 208 | status = WEXITSTATUS(status); |
| 209 | log_print(INFO, "Pppd is terminated (status = %d)", status); |
| 210 | status += PPPD_EXITED; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 211 | pppd_pid = 0; |
| 212 | } else { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 213 | status = USER_REQUESTED; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 214 | } |
| 215 | } |
| 216 | |
| 217 | stop_pppd(); |
| 218 | the_protocol->shutdown(); |
| 219 | |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 220 | #ifdef ANDROID_CHANGES |
| 221 | code = status; |
| 222 | send(control, &code, 1, 0); |
| 223 | #endif |
| 224 | log_print(INFO, "Mtpd is terminated (status = %d)", status); |
| 225 | return status; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | void log_print(int level, char *format, ...) |
| 229 | { |
| 230 | if (level >= 0 && level <= LOG_MAX) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 231 | #ifdef ANDROID_CHANGES |
| 232 | static int levels[5] = { |
| 233 | ANDROID_LOG_DEBUG, ANDROID_LOG_INFO, ANDROID_LOG_WARN, |
| 234 | ANDROID_LOG_ERROR, ANDROID_LOG_FATAL |
| 235 | }; |
| 236 | va_list ap; |
| 237 | va_start(ap, format); |
| 238 | __android_log_vprint(levels[level], "mtpd", format, ap); |
| 239 | va_end(ap); |
| 240 | #else |
| 241 | static char *levels = "DIWEF"; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 242 | va_list ap; |
| 243 | fprintf(stderr, "%c: ", levels[level]); |
| 244 | va_start(ap, format); |
| 245 | vfprintf(stderr, format, ap); |
| 246 | va_end(ap); |
| 247 | fputc('\n', stderr); |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 248 | #endif |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 249 | } |
| 250 | } |
| 251 | |
| 252 | void create_socket(int family, int type, char *server, char *port) |
| 253 | { |
| 254 | struct addrinfo hints = { |
| 255 | .ai_flags = AI_NUMERICSERV, |
| 256 | .ai_family = family, |
| 257 | .ai_socktype = type, |
| 258 | }; |
| 259 | struct addrinfo *records; |
| 260 | struct addrinfo *r; |
| 261 | int error; |
| 262 | |
| 263 | log_print(INFO, "Connecting to %s port %s", server, port); |
| 264 | |
| 265 | error = getaddrinfo(server, port, &hints, &records); |
| 266 | if (error) { |
| 267 | log_print(FATAL, "Getaddrinfo() %s", (error == EAI_SYSTEM) ? |
| 268 | strerror(errno) : gai_strerror(error)); |
| 269 | exit(NETWORK_ERROR); |
| 270 | } |
| 271 | |
| 272 | for (r = records; r; r = r->ai_next) { |
| 273 | the_socket = socket(r->ai_family, r->ai_socktype, r->ai_protocol); |
| 274 | if (the_socket != -1 |
| 275 | && connect(the_socket, r->ai_addr, r->ai_addrlen) == 0) { |
| 276 | break; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | freeaddrinfo(records); |
| 281 | |
| 282 | if (the_socket == -1) { |
| 283 | log_print(FATAL, "Connect() %s", strerror(errno)); |
| 284 | exit(NETWORK_ERROR); |
| 285 | } |
| 286 | |
| 287 | fcntl(the_socket, F_SETFD, FD_CLOEXEC); |
| 288 | log_print(INFO, "Connection established (socket = %d)", the_socket); |
| 289 | } |
| 290 | |
| 291 | void start_pppd(int pppox) |
| 292 | { |
| 293 | if (pppd_pid) { |
| 294 | log_print(WARNING, "Pppd is already started (pid = %d)", pppd_pid); |
| 295 | close(pppox); |
| 296 | return; |
| 297 | } |
| 298 | |
| 299 | log_print(INFO, "Starting pppd (pppox = %d)", pppox); |
| 300 | |
| 301 | pppd_pid = fork(); |
| 302 | if (pppd_pid < 0) { |
| 303 | log_print(FATAL, "Fork() %s", strerror(errno)); |
| 304 | exit(SYSTEM_ERROR); |
| 305 | } |
| 306 | |
| 307 | if (!pppd_pid) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 308 | char *args[pppd_argc + 5]; |
| 309 | char number[12]; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 310 | |
| 311 | sprintf(number, "%d", pppox); |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 312 | args[0] = "pppd"; |
| 313 | args[1] = "nodetach"; |
| 314 | args[2] = "pppox"; |
| 315 | args[3] = number; |
| 316 | memcpy(&args[4], pppd_argv, sizeof(char *) * pppd_argc); |
| 317 | args[4 + pppd_argc] = NULL; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 318 | |
| 319 | execvp("pppd", args); |
| 320 | log_print(FATAL, "Exec() %s", strerror(errno)); |
| 321 | exit(1); /* Pretending a fatal error in pppd. */ |
| 322 | } |
| 323 | |
| 324 | log_print(INFO, "Pppd started (pid = %d)", pppd_pid); |
| 325 | close(pppox); |
| 326 | } |