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 | { |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 60 | int i; |
| 61 | |
Chia-chi Yeh | 7b66d20 | 2011-06-28 16:39:23 -0700 | [diff] [blame] | 62 | for (i = 0; protocols[i]; ++i) { |
| 63 | struct protocol *p = protocols[i]; |
| 64 | if (argc - 2 >= p->arguments && !strcmp(argv[1], p->name)) { |
| 65 | log_print(INFO, "Using protocol %s", p->name); |
| 66 | the_protocol = p; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 67 | break; |
| 68 | } |
| 69 | } |
| 70 | |
Chia-chi Yeh | 7b66d20 | 2011-06-28 16:39:23 -0700 | [diff] [blame] | 71 | if (!the_protocol) { |
| 72 | printf("Usages:\n"); |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 73 | for (i = 0; protocols[i]; ++i) { |
Chia-chi Yeh | 7b66d20 | 2011-06-28 16:39:23 -0700 | [diff] [blame] | 74 | struct protocol *p = protocols[i]; |
| 75 | printf(" %s %s %s pppd-arguments\n", argv[0], p->name, p->usage); |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 76 | } |
Chia-chi Yeh | 7b66d20 | 2011-06-28 16:39:23 -0700 | [diff] [blame] | 77 | exit(0); |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 78 | } |
| 79 | |
Chia-chi Yeh | 7b66d20 | 2011-06-28 16:39:23 -0700 | [diff] [blame] | 80 | pppd_argc = argc - 2 - the_protocol->arguments; |
| 81 | pppd_argv = &argv[2 + the_protocol->arguments]; |
| 82 | return the_protocol->connect(&argv[2]); |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | static void stop_pppd() |
| 86 | { |
| 87 | if (pppd_pid) { |
| 88 | log_print(INFO, "Sending signal to pppd (pid = %d)", pppd_pid); |
| 89 | kill(pppd_pid, SIGTERM); |
| 90 | sleep(5); |
| 91 | pppd_pid = 0; |
| 92 | } |
| 93 | } |
| 94 | |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 95 | #ifdef ANDROID_CHANGES |
| 96 | |
| 97 | static int get_control_and_arguments(int *argc, char ***argv) |
| 98 | { |
Chia-chi Yeh | 7b66d20 | 2011-06-28 16:39:23 -0700 | [diff] [blame] | 99 | static char *args[32]; |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 100 | int control; |
| 101 | int i; |
| 102 | |
Chia-chi Yeh | 063bb92 | 2009-06-15 14:43:38 +0800 | [diff] [blame] | 103 | if ((i = android_get_control_socket("mtpd")) == -1) { |
| 104 | return -1; |
| 105 | } |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 106 | log_print(DEBUG, "Waiting for control socket"); |
Chia-chi Yeh | 063bb92 | 2009-06-15 14:43:38 +0800 | [diff] [blame] | 107 | if (listen(i, 1) == -1 || (control = accept(i, NULL, 0)) == -1) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 108 | log_print(FATAL, "Cannot get control socket"); |
| 109 | exit(SYSTEM_ERROR); |
| 110 | } |
| 111 | close(i); |
| 112 | fcntl(control, F_SETFD, FD_CLOEXEC); |
| 113 | |
| 114 | args[0] = (*argv)[0]; |
Chia-chi Yeh | 7b66d20 | 2011-06-28 16:39:23 -0700 | [diff] [blame] | 115 | for (i = 1; i < 32; ++i) { |
Chia-chi Yeh | 41ab620 | 2011-06-28 16:52:02 -0700 | [diff] [blame^] | 116 | unsigned char bytes[2]; |
| 117 | if (recv(control, &bytes[0], 1, 0) != 1 |
| 118 | || recv(control, &bytes[1], 1, 0) != 1) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 119 | log_print(FATAL, "Cannot get argument length"); |
| 120 | exit(SYSTEM_ERROR); |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 121 | } else { |
Chia-chi Yeh | 41ab620 | 2011-06-28 16:52:02 -0700 | [diff] [blame^] | 122 | int length = bytes[0] << 8 | bytes[1]; |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 123 | int offset = 0; |
Chia-chi Yeh | 41ab620 | 2011-06-28 16:52:02 -0700 | [diff] [blame^] | 124 | |
| 125 | if (length == 0xFFFF) { |
| 126 | break; |
| 127 | } |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 128 | args[i] = malloc(length + 1); |
| 129 | while (offset < length) { |
| 130 | int n = recv(control, &args[i][offset], length - offset, 0); |
| 131 | if (n > 0) { |
| 132 | offset += n; |
| 133 | } else { |
| 134 | log_print(FATAL, "Cannot get argument value"); |
| 135 | exit(SYSTEM_ERROR); |
| 136 | } |
| 137 | } |
| 138 | args[i][length] = 0; |
| 139 | } |
| 140 | } |
| 141 | log_print(DEBUG, "Received %d arguments", i - 1); |
| 142 | |
| 143 | *argc = i; |
| 144 | *argv = args; |
| 145 | return control; |
| 146 | } |
| 147 | |
| 148 | #endif |
| 149 | |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 150 | int main(int argc, char **argv) |
| 151 | { |
| 152 | struct pollfd pollfds[2]; |
| 153 | int timeout; |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 154 | int status; |
| 155 | #ifdef ANDROID_CHANGES |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 156 | int control = get_control_and_arguments(&argc, &argv); |
Chia-chi Yeh | fa04c31 | 2009-07-11 01:01:33 +0800 | [diff] [blame] | 157 | unsigned char code = argc - 1; |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 158 | send(control, &code, 1, 0); |
| 159 | #endif |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 160 | |
| 161 | srandom(time(NULL)); |
| 162 | |
| 163 | if (pipe(signals) == -1) { |
| 164 | log_print(FATAL, "Pipe() %s", strerror(errno)); |
| 165 | exit(SYSTEM_ERROR); |
| 166 | } |
Chia-chi Yeh | 2d24765 | 2009-06-23 09:13:45 +0800 | [diff] [blame] | 167 | fcntl(signals[0], F_SETFD, FD_CLOEXEC); |
| 168 | fcntl(signals[1], F_SETFD, FD_CLOEXEC); |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 169 | |
Chia-chi Yeh | a777654 | 2009-06-19 16:36:32 +0800 | [diff] [blame] | 170 | timeout = initialize(argc, argv); |
| 171 | |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 172 | signal(SIGHUP, interrupt); |
| 173 | signal(SIGINT, interrupt); |
| 174 | signal(SIGTERM, interrupt); |
| 175 | signal(SIGCHLD, interrupt); |
| 176 | signal(SIGPIPE, SIG_IGN); |
| 177 | atexit(stop_pppd); |
| 178 | |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 179 | pollfds[0].fd = signals[0]; |
| 180 | pollfds[0].events = POLLIN; |
| 181 | pollfds[1].fd = the_socket; |
| 182 | pollfds[1].events = POLLIN; |
| 183 | |
| 184 | while (timeout >= 0) { |
| 185 | if (poll(pollfds, 2, timeout ? timeout : -1) == -1 && errno != EINTR) { |
| 186 | log_print(FATAL, "Poll() %s", strerror(errno)); |
| 187 | exit(SYSTEM_ERROR); |
| 188 | } |
| 189 | if (pollfds[0].revents) { |
| 190 | break; |
| 191 | } |
| 192 | timeout = pollfds[1].revents ? |
| 193 | the_protocol->process() : the_protocol->timeout(); |
| 194 | } |
| 195 | |
| 196 | if (timeout < 0) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 197 | status = -timeout; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 198 | } else { |
| 199 | int signal; |
| 200 | read(signals[0], &signal, sizeof(int)); |
| 201 | log_print(INFO, "Received signal %d", signal); |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 202 | if (signal == SIGCHLD && waitpid(pppd_pid, &status, WNOHANG) == pppd_pid |
| 203 | && WIFEXITED(status)) { |
| 204 | status = WEXITSTATUS(status); |
| 205 | log_print(INFO, "Pppd is terminated (status = %d)", status); |
| 206 | status += PPPD_EXITED; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 207 | pppd_pid = 0; |
| 208 | } else { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 209 | status = USER_REQUESTED; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 210 | } |
| 211 | } |
| 212 | |
| 213 | stop_pppd(); |
| 214 | the_protocol->shutdown(); |
| 215 | |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 216 | #ifdef ANDROID_CHANGES |
| 217 | code = status; |
| 218 | send(control, &code, 1, 0); |
| 219 | #endif |
| 220 | log_print(INFO, "Mtpd is terminated (status = %d)", status); |
| 221 | return status; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | void log_print(int level, char *format, ...) |
| 225 | { |
| 226 | if (level >= 0 && level <= LOG_MAX) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 227 | #ifdef ANDROID_CHANGES |
| 228 | static int levels[5] = { |
| 229 | ANDROID_LOG_DEBUG, ANDROID_LOG_INFO, ANDROID_LOG_WARN, |
| 230 | ANDROID_LOG_ERROR, ANDROID_LOG_FATAL |
| 231 | }; |
| 232 | va_list ap; |
| 233 | va_start(ap, format); |
| 234 | __android_log_vprint(levels[level], "mtpd", format, ap); |
| 235 | va_end(ap); |
| 236 | #else |
| 237 | static char *levels = "DIWEF"; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 238 | va_list ap; |
| 239 | fprintf(stderr, "%c: ", levels[level]); |
| 240 | va_start(ap, format); |
| 241 | vfprintf(stderr, format, ap); |
| 242 | va_end(ap); |
| 243 | fputc('\n', stderr); |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 244 | #endif |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 245 | } |
| 246 | } |
| 247 | |
| 248 | void create_socket(int family, int type, char *server, char *port) |
| 249 | { |
| 250 | struct addrinfo hints = { |
| 251 | .ai_flags = AI_NUMERICSERV, |
| 252 | .ai_family = family, |
| 253 | .ai_socktype = type, |
| 254 | }; |
| 255 | struct addrinfo *records; |
| 256 | struct addrinfo *r; |
| 257 | int error; |
| 258 | |
| 259 | log_print(INFO, "Connecting to %s port %s", server, port); |
| 260 | |
| 261 | error = getaddrinfo(server, port, &hints, &records); |
| 262 | if (error) { |
| 263 | log_print(FATAL, "Getaddrinfo() %s", (error == EAI_SYSTEM) ? |
| 264 | strerror(errno) : gai_strerror(error)); |
| 265 | exit(NETWORK_ERROR); |
| 266 | } |
| 267 | |
| 268 | for (r = records; r; r = r->ai_next) { |
| 269 | the_socket = socket(r->ai_family, r->ai_socktype, r->ai_protocol); |
Chia-chi Yeh | a777654 | 2009-06-19 16:36:32 +0800 | [diff] [blame] | 270 | if (the_socket != -1) { |
| 271 | if (connect(the_socket, r->ai_addr, r->ai_addrlen) == 0) { |
| 272 | break; |
| 273 | } |
| 274 | close(the_socket); |
Chia-chi Yeh | fa04c31 | 2009-07-11 01:01:33 +0800 | [diff] [blame] | 275 | the_socket = -1; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 276 | } |
| 277 | } |
| 278 | |
| 279 | freeaddrinfo(records); |
| 280 | |
| 281 | if (the_socket == -1) { |
| 282 | log_print(FATAL, "Connect() %s", strerror(errno)); |
| 283 | exit(NETWORK_ERROR); |
| 284 | } |
| 285 | |
| 286 | fcntl(the_socket, F_SETFD, FD_CLOEXEC); |
| 287 | log_print(INFO, "Connection established (socket = %d)", the_socket); |
| 288 | } |
| 289 | |
| 290 | void start_pppd(int pppox) |
| 291 | { |
| 292 | if (pppd_pid) { |
| 293 | log_print(WARNING, "Pppd is already started (pid = %d)", pppd_pid); |
| 294 | close(pppox); |
| 295 | return; |
| 296 | } |
| 297 | |
| 298 | log_print(INFO, "Starting pppd (pppox = %d)", pppox); |
| 299 | |
| 300 | pppd_pid = fork(); |
| 301 | if (pppd_pid < 0) { |
| 302 | log_print(FATAL, "Fork() %s", strerror(errno)); |
| 303 | exit(SYSTEM_ERROR); |
| 304 | } |
| 305 | |
| 306 | if (!pppd_pid) { |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 307 | char *args[pppd_argc + 5]; |
| 308 | char number[12]; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 309 | |
| 310 | sprintf(number, "%d", pppox); |
Chia-chi Yeh | 84e3195 | 2009-06-08 14:11:34 +0800 | [diff] [blame] | 311 | args[0] = "pppd"; |
| 312 | args[1] = "nodetach"; |
| 313 | args[2] = "pppox"; |
| 314 | args[3] = number; |
| 315 | memcpy(&args[4], pppd_argv, sizeof(char *) * pppd_argc); |
| 316 | args[4 + pppd_argc] = NULL; |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 317 | |
Chia-chi Yeh | 4a721df | 2009-12-15 03:53:47 +0800 | [diff] [blame] | 318 | #ifdef ANDROID_CHANGES |
| 319 | { |
| 320 | char envargs[65536]; |
| 321 | char *tail = envargs; |
| 322 | int i; |
| 323 | /* Hex encode the arguments using [A-P] instead of [0-9A-F]. */ |
| 324 | for (i = 0; args[i]; ++i) { |
| 325 | char *p = args[i]; |
| 326 | do { |
| 327 | *tail++ = 'A' + ((*p >> 4) & 0x0F); |
| 328 | *tail++ = 'A' + (*p & 0x0F); |
| 329 | } while (*p++); |
| 330 | } |
| 331 | *tail = 0; |
| 332 | setenv("envargs", envargs, 1); |
| 333 | args[1] = NULL; |
| 334 | } |
| 335 | #endif |
Chia-chi Yeh | 79e6232 | 2009-06-02 08:49:55 +0800 | [diff] [blame] | 336 | execvp("pppd", args); |
| 337 | log_print(FATAL, "Exec() %s", strerror(errno)); |
| 338 | exit(1); /* Pretending a fatal error in pppd. */ |
| 339 | } |
| 340 | |
| 341 | log_print(INFO, "Pppd started (pid = %d)", pppd_pid); |
| 342 | close(pppox); |
| 343 | } |