The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 3 | * Copyright (c) 2006-2012 Roy Marples <roy@marples.name> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 4 | * All rights reserved |
| 5 | |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | */ |
| 27 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 28 | /* Needed define to get at getline for glibc and FreeBSD */ |
| 29 | #ifndef _GNU_SOURCE |
| 30 | # define _GNU_SOURCE |
| 31 | #endif |
| 32 | |
| 33 | #include <sys/cdefs.h> |
| 34 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 35 | #ifdef __APPLE__ |
| 36 | # include <mach/mach_time.h> |
| 37 | # include <mach/kern_return.h> |
| 38 | #endif |
| 39 | |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/time.h> |
| 42 | |
| 43 | #include <errno.h> |
| 44 | #include <fcntl.h> |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 45 | #include <limits.h> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 46 | #ifdef BSD |
| 47 | # include <paths.h> |
| 48 | #endif |
| 49 | #include <stdint.h> |
| 50 | #include <stdio.h> |
| 51 | #include <stdlib.h> |
| 52 | #include <string.h> |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 53 | #include <syslog.h> |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 54 | #include <time.h> |
| 55 | #include <unistd.h> |
| 56 | |
| 57 | #include "common.h" |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 58 | |
| 59 | #ifndef _PATH_DEVNULL |
| 60 | # define _PATH_DEVNULL "/dev/null" |
| 61 | #endif |
| 62 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 63 | int clock_monotonic; |
| 64 | static char *lbuf; |
| 65 | static size_t lbuf_len; |
| 66 | #ifdef DEBUG_MEMORY |
| 67 | static char lbuf_set; |
| 68 | #endif |
| 69 | |
| 70 | #ifdef DEBUG_MEMORY |
| 71 | static void |
| 72 | free_lbuf(void) |
| 73 | { |
| 74 | free(lbuf); |
| 75 | lbuf = NULL; |
| 76 | } |
| 77 | #endif |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 78 | |
| 79 | /* Handy routine to read very long lines in text files. |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 80 | * This means we read the whole line and avoid any nasty buffer overflows. |
| 81 | * We strip leading space and avoid comment lines, making the code that calls |
| 82 | * us smaller. |
| 83 | * As we don't use threads, this API is clean too. */ |
| 84 | char * |
| 85 | get_line(FILE * __restrict fp) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 86 | { |
| 87 | char *p; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 88 | ssize_t bytes; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 89 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 90 | #ifdef DEBUG_MEMORY |
| 91 | if (lbuf_set == 0) { |
| 92 | atexit(free_lbuf); |
| 93 | lbuf_set = 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 94 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 95 | #endif |
| 96 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 97 | do { |
| 98 | bytes = getline(&lbuf, &lbuf_len, fp); |
| 99 | if (bytes == -1) |
| 100 | return NULL; |
| 101 | for (p = lbuf; *p == ' ' || *p == '\t'; p++) |
| 102 | ; |
| 103 | } while (*p == '\0' || *p == '\n' || *p == '#' || *p == ';'); |
| 104 | if (lbuf[--bytes] == '\n') |
| 105 | lbuf[bytes] = '\0'; |
| 106 | return p; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | int |
| 110 | set_cloexec(int fd) |
| 111 | { |
| 112 | int flags; |
| 113 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 114 | if ((flags = fcntl(fd, F_GETFD, 0)) == -1 || |
| 115 | fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 116 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 117 | syslog(LOG_ERR, "fcntl: %m"); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 118 | return -1; |
| 119 | } |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | int |
| 124 | set_nonblock(int fd) |
| 125 | { |
| 126 | int flags; |
| 127 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 128 | if ((flags = fcntl(fd, F_GETFL, 0)) == -1 || |
| 129 | fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 130 | { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 131 | syslog(LOG_ERR, "fcntl: %m"); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 132 | return -1; |
| 133 | } |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | /* Handy function to get the time. |
| 138 | * We only care about time advancements, not the actual time itself |
| 139 | * Which is why we use CLOCK_MONOTONIC, but it is not available on all |
| 140 | * platforms. |
| 141 | */ |
| 142 | #define NO_MONOTONIC "host does not support a monotonic clock - timing can skew" |
| 143 | int |
| 144 | get_monotonic(struct timeval *tp) |
| 145 | { |
| 146 | static int posix_clock_set = 0; |
| 147 | #if defined(_POSIX_MONOTONIC_CLOCK) && defined(CLOCK_MONOTONIC) |
| 148 | struct timespec ts; |
| 149 | static clockid_t posix_clock; |
| 150 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 151 | if (!posix_clock_set) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 152 | if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) { |
| 153 | posix_clock = CLOCK_MONOTONIC; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 154 | clock_monotonic = posix_clock_set = 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 155 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 156 | } |
| 157 | |
| 158 | if (clock_monotonic) { |
| 159 | if (clock_gettime(posix_clock, &ts) == 0) { |
| 160 | tp->tv_sec = ts.tv_sec; |
| 161 | tp->tv_usec = ts.tv_nsec / 1000; |
| 162 | return 0; |
| 163 | } |
| 164 | } |
| 165 | #elif defined(__APPLE__) |
| 166 | #define NSEC_PER_SEC 1000000000 |
| 167 | /* We can use mach kernel functions here. |
| 168 | * This is crap though - why can't they implement clock_gettime?*/ |
| 169 | static struct mach_timebase_info info = { 0, 0 }; |
| 170 | static double factor = 0.0; |
| 171 | uint64_t nano; |
| 172 | long rem; |
| 173 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 174 | if (!posix_clock_set) { |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 175 | if (mach_timebase_info(&info) == KERN_SUCCESS) { |
| 176 | factor = (double)info.numer / (double)info.denom; |
Dmitry Shmidt | 938bc38 | 2010-01-08 10:47:26 -0800 | [diff] [blame] | 177 | clock_monotonic = posix_clock_set = 1; |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 178 | } |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 179 | } |
| 180 | if (clock_monotonic) { |
| 181 | nano = mach_absolute_time(); |
| 182 | if ((info.denom != 1 || info.numer != 1) && factor != 0.0) |
| 183 | nano *= factor; |
| 184 | tp->tv_sec = nano / NSEC_PER_SEC; |
| 185 | rem = nano % NSEC_PER_SEC; |
| 186 | if (rem < 0) { |
| 187 | tp->tv_sec--; |
| 188 | rem += NSEC_PER_SEC; |
| 189 | } |
| 190 | tp->tv_usec = rem / 1000; |
| 191 | return 0; |
| 192 | } |
| 193 | #endif |
| 194 | |
| 195 | /* Something above failed, so fall back to gettimeofday */ |
| 196 | if (!posix_clock_set) { |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 197 | syslog(LOG_WARNING, NO_MONOTONIC); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 198 | posix_clock_set = 1; |
| 199 | } |
| 200 | return gettimeofday(tp, NULL); |
| 201 | } |
| 202 | |
Dmitry Shmidt | a3a2260 | 2012-07-23 16:45:46 -0700 | [diff] [blame] | 203 | ssize_t |
| 204 | setvar(char ***e, const char *prefix, const char *var, const char *value) |
| 205 | { |
| 206 | size_t len = strlen(var) + strlen(value) + 3; |
| 207 | |
| 208 | if (prefix) |
| 209 | len += strlen(prefix) + 1; |
| 210 | **e = xmalloc(len); |
| 211 | if (prefix) |
| 212 | snprintf(**e, len, "%s_%s=%s", prefix, var, value); |
| 213 | else |
| 214 | snprintf(**e, len, "%s=%s", var, value); |
| 215 | (*e)++; |
| 216 | return len; |
| 217 | } |
| 218 | |
| 219 | ssize_t |
| 220 | setvard(char ***e, const char *prefix, const char *var, int value) |
| 221 | { |
| 222 | char buffer[32]; |
| 223 | |
| 224 | snprintf(buffer, sizeof(buffer), "%d", value); |
| 225 | return setvar(e, prefix, var, buffer); |
| 226 | } |
| 227 | |
| 228 | |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 229 | time_t |
| 230 | uptime(void) |
| 231 | { |
| 232 | struct timeval tv; |
| 233 | |
| 234 | if (get_monotonic(&tv) == -1) |
| 235 | return -1; |
| 236 | return tv.tv_sec; |
| 237 | } |
| 238 | |
| 239 | int |
| 240 | writepid(int fd, pid_t pid) |
| 241 | { |
| 242 | char spid[16]; |
| 243 | ssize_t len; |
| 244 | |
| 245 | if (ftruncate(fd, (off_t)0) == -1) |
| 246 | return -1; |
| 247 | snprintf(spid, sizeof(spid), "%u\n", pid); |
| 248 | len = pwrite(fd, spid, strlen(spid), (off_t)0); |
| 249 | if (len != (ssize_t)strlen(spid)) |
| 250 | return -1; |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | void * |
| 255 | xmalloc(size_t s) |
| 256 | { |
| 257 | void *value = malloc(s); |
| 258 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 259 | if (value != NULL) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 260 | return value; |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 261 | syslog(LOG_ERR, "memory exhausted (xalloc %zu bytes)", s); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 262 | exit (EXIT_FAILURE); |
| 263 | /* NOTREACHED */ |
| 264 | } |
| 265 | |
| 266 | void * |
| 267 | xzalloc(size_t s) |
| 268 | { |
| 269 | void *value = xmalloc(s); |
| 270 | |
| 271 | memset(value, 0, s); |
| 272 | return value; |
| 273 | } |
| 274 | |
| 275 | void * |
| 276 | xrealloc(void *ptr, size_t s) |
| 277 | { |
| 278 | void *value = realloc(ptr, s); |
| 279 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 280 | if (value != NULL) |
| 281 | return value; |
| 282 | syslog(LOG_ERR, "memory exhausted (xrealloc %zu bytes)", s); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 283 | exit(EXIT_FAILURE); |
| 284 | /* NOTREACHED */ |
| 285 | } |
| 286 | |
| 287 | char * |
| 288 | xstrdup(const char *str) |
| 289 | { |
| 290 | char *value; |
| 291 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 292 | if (str == NULL) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 293 | return NULL; |
| 294 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 295 | if ((value = strdup(str)) != NULL) |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 296 | return value; |
| 297 | |
Dmitry Shmidt | e86eee1 | 2011-01-24 16:27:51 -0800 | [diff] [blame] | 298 | syslog(LOG_ERR, "memory exhausted (xstrdup)"); |
The Android Open Source Project | f7c5421 | 2009-03-03 19:29:22 -0800 | [diff] [blame] | 299 | exit(EXIT_FAILURE); |
| 300 | /* NOTREACHED */ |
| 301 | } |