Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2006-2015 Roy Marples <roy@marples.name> |
| 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 | |
| 28 | #ifdef __APPLE__ |
| 29 | # include <mach/mach_time.h> |
| 30 | # include <mach/kern_return.h> |
| 31 | #endif |
| 32 | |
| 33 | #include <sys/param.h> |
| 34 | #include <sys/time.h> |
| 35 | |
| 36 | #include <ctype.h> |
| 37 | #include <err.h> |
| 38 | #include <errno.h> |
| 39 | #include <fcntl.h> |
| 40 | #include <limits.h> |
| 41 | #ifdef BSD |
| 42 | # include <paths.h> |
| 43 | #endif |
| 44 | #include <stdarg.h> |
| 45 | #include <stdint.h> |
| 46 | #include <stdio.h> |
| 47 | #include <stdlib.h> |
| 48 | #include <string.h> |
| 49 | #include <syslog.h> |
| 50 | #include <time.h> |
| 51 | #include <unistd.h> |
| 52 | |
| 53 | #include "common.h" |
| 54 | #include "dhcpcd.h" |
| 55 | #include "if-options.h" |
| 56 | |
| 57 | #ifndef _PATH_DEVNULL |
| 58 | # define _PATH_DEVNULL "/dev/null" |
| 59 | #endif |
| 60 | |
| 61 | const char * |
| 62 | get_hostname(char *buf, size_t buflen, int short_hostname) |
| 63 | { |
| 64 | char *p; |
| 65 | |
| 66 | if (gethostname(buf, buflen) != 0) |
| 67 | return NULL; |
| 68 | buf[buflen - 1] = '\0'; |
| 69 | if (strcmp(buf, "(none)") == 0 || |
| 70 | strcmp(buf, "localhost") == 0 || |
| 71 | strncmp(buf, "localhost.", strlen("localhost.")) == 0 || |
| 72 | buf[0] == '.') |
| 73 | return NULL; |
| 74 | |
| 75 | if (short_hostname) { |
| 76 | p = strchr(buf, '.'); |
| 77 | if (p) |
| 78 | *p = '\0'; |
| 79 | } |
| 80 | |
| 81 | return buf; |
| 82 | } |
| 83 | |
| 84 | /* Handy function to get the time. |
| 85 | * We only care about time advancements, not the actual time itself |
| 86 | * Which is why we use CLOCK_MONOTONIC, but it is not available on all |
| 87 | * platforms. |
| 88 | */ |
| 89 | #define NO_MONOTONIC "host does not support a monotonic clock - timing can skew" |
| 90 | int |
| 91 | get_monotonic(struct timespec *ts) |
| 92 | { |
| 93 | |
| 94 | #if defined(_POSIX_MONOTONIC_CLOCK) && defined(CLOCK_MONOTONIC) |
| 95 | return clock_gettime(CLOCK_MONOTONIC, ts); |
| 96 | #elif defined(__APPLE__) |
| 97 | /* We can use mach kernel functions here. |
| 98 | * This is crap though - why can't they implement clock_gettime?*/ |
| 99 | static struct mach_timebase_info info = { 0, 0 }; |
| 100 | static double factor = 0.0; |
| 101 | uint64_t nano; |
| 102 | long rem; |
| 103 | |
| 104 | if (!posix_clock_set) { |
| 105 | if (mach_timebase_info(&info) == KERN_SUCCESS) { |
| 106 | factor = (double)info.numer / (double)info.denom; |
| 107 | clock_monotonic = posix_clock_set = 1; |
| 108 | } |
| 109 | } |
| 110 | if (clock_monotonic) { |
| 111 | nano = mach_absolute_time(); |
| 112 | if ((info.denom != 1 || info.numer != 1) && factor != 0.0) |
| 113 | nano *= factor; |
| 114 | ts->tv_sec = nano / NSEC_PER_SEC; |
| 115 | ts->tv_nsec = nano % NSEC_PER_SEC; |
| 116 | if (ts->tv_nsec < 0) { |
| 117 | ts->tv_sec--; |
| 118 | ts->tv_nsec += NSEC_PER_SEC; |
| 119 | } |
| 120 | return 0; |
| 121 | } |
| 122 | #endif |
| 123 | |
| 124 | #if 0 |
| 125 | /* Something above failed, so fall back to gettimeofday */ |
| 126 | if (!posix_clock_set) { |
| 127 | logger(NULL, LOG_WARNING, NO_MONOTONIC); |
| 128 | posix_clock_set = 1; |
| 129 | } |
| 130 | #endif |
| 131 | { |
| 132 | struct timeval tv; |
| 133 | if (gettimeofday(&tv, NULL) == 0) { |
| 134 | TIMEVAL_TO_TIMESPEC(&tv, ts); |
| 135 | return 0; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | return -1; |
| 140 | } |
| 141 | |
| 142 | #if USE_LOGFILE |
| 143 | void |
| 144 | logger_open(struct dhcpcd_ctx *ctx) |
| 145 | { |
| 146 | |
| 147 | if (ctx->logfile) { |
| 148 | int f = O_CREAT | O_APPEND | O_TRUNC; |
| 149 | |
| 150 | #ifdef O_CLOEXEC |
| 151 | f |= O_CLOEXEC; |
| 152 | #endif |
| 153 | ctx->log_fd = open(ctx->logfile, O_WRONLY | f, 0644); |
| 154 | if (ctx->log_fd == -1) |
| 155 | warn("open: %s", ctx->logfile); |
| 156 | #ifndef O_CLOEXEC |
| 157 | else { |
| 158 | if (fcntl(ctx->log_fd, F_GETFD, &f) == -1 || |
| 159 | fcntl(ctx->log_fd, F_SETFD, f | FD_CLOEXEC) == -1) |
| 160 | warn("fcntl: %s", ctx->logfile); |
| 161 | } |
| 162 | #endif |
| 163 | } else |
Samuel Tan | e942e09 | 2015-08-13 17:14:37 -0700 | [diff] [blame] | 164 | openlog(PACKAGE, LOG_PID | LOG_PERROR, LOG_DAEMON); |
Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | void |
| 168 | logger_close(struct dhcpcd_ctx *ctx) |
| 169 | { |
| 170 | |
| 171 | if (ctx->log_fd != -1) { |
| 172 | close(ctx->log_fd); |
| 173 | ctx->log_fd = -1; |
| 174 | } |
| 175 | closelog(); |
| 176 | } |
| 177 | |
| 178 | void |
| 179 | logger(struct dhcpcd_ctx *ctx, int pri, const char *fmt, ...) |
| 180 | { |
| 181 | va_list va; |
| 182 | int serrno; |
| 183 | #ifndef HAVE_PRINTF_M |
| 184 | char fmt_cpy[1024]; |
| 185 | #endif |
| 186 | |
| 187 | if (pri >= LOG_DEBUG && ctx && !(ctx->options & DHCPCD_DEBUG)) |
| 188 | return; |
| 189 | |
| 190 | serrno = errno; |
| 191 | va_start(va, fmt); |
| 192 | |
| 193 | #ifndef HAVE_PRINTF_M |
| 194 | /* Print strerrno(errno) in place of %m */ |
| 195 | if (ctx == NULL || !(ctx->options & DHCPCD_QUIET) || ctx->log_fd != -1) |
| 196 | { |
| 197 | const char *p; |
| 198 | char *fp = fmt_cpy, *serr = NULL; |
| 199 | size_t fmt_left = sizeof(fmt_cpy) - 1, fmt_wrote; |
| 200 | |
| 201 | for (p = fmt; *p != '\0'; p++) { |
| 202 | if (p[0] == '%' && p[1] == '%') { |
| 203 | if (fmt_left < 2) |
| 204 | break; |
| 205 | *fp++ = '%'; |
| 206 | *fp++ = '%'; |
| 207 | fmt_left -= 2; |
| 208 | p++; |
| 209 | } else if (p[0] == '%' && p[1] == 'm') { |
| 210 | if (serr == NULL) |
| 211 | serr = strerror(serrno); |
| 212 | fmt_wrote = strlcpy(fp, serr, fmt_left); |
| 213 | if (fmt_wrote > fmt_left) |
| 214 | break; |
| 215 | fp += fmt_wrote; |
| 216 | fmt_left -= fmt_wrote; |
| 217 | p++; |
| 218 | } else { |
| 219 | *fp++ = *p; |
| 220 | --fmt_left; |
| 221 | } |
| 222 | if (fmt_left == 0) |
| 223 | break; |
| 224 | } |
| 225 | *fp++ = '\0'; |
| 226 | fmt = fmt_cpy; |
| 227 | } |
| 228 | |
| 229 | #endif |
| 230 | |
| 231 | if (ctx == NULL || !(ctx->options & DHCPCD_QUIET)) { |
| 232 | va_list vac; |
| 233 | |
| 234 | va_copy(vac, va); |
| 235 | vfprintf(pri <= LOG_ERR ? stderr : stdout, fmt, vac); |
| 236 | fputc('\n', pri <= LOG_ERR ? stderr : stdout); |
| 237 | va_end(vac); |
| 238 | } |
| 239 | |
| 240 | #ifdef HAVE_PRINTF_M |
| 241 | errno = serrno; |
| 242 | #endif |
| 243 | if (ctx && ctx->log_fd != -1) { |
| 244 | struct timeval tv; |
| 245 | char buf[32]; |
| 246 | |
| 247 | /* Write the time, syslog style. month day time - */ |
| 248 | if (gettimeofday(&tv, NULL) != -1) { |
| 249 | time_t now; |
| 250 | struct tm tmnow; |
| 251 | |
| 252 | tzset(); |
| 253 | now = tv.tv_sec; |
| 254 | localtime_r(&now, &tmnow); |
| 255 | strftime(buf, sizeof(buf), "%b %d %T ", &tmnow); |
| 256 | dprintf(ctx->log_fd, "%s", buf); |
| 257 | } |
| 258 | |
| 259 | vdprintf(ctx->log_fd, fmt, va); |
| 260 | dprintf(ctx->log_fd, "\n"); |
| 261 | } else |
| 262 | vsyslog(pri, fmt, va); |
| 263 | va_end(va); |
| 264 | } |
| 265 | #endif |
| 266 | |
| 267 | ssize_t |
| 268 | setvar(struct dhcpcd_ctx *ctx, |
| 269 | char ***e, const char *prefix, const char *var, const char *value) |
| 270 | { |
| 271 | size_t len = strlen(var) + strlen(value) + 3; |
| 272 | |
| 273 | if (prefix) |
| 274 | len += strlen(prefix) + 1; |
| 275 | **e = malloc(len); |
| 276 | if (**e == NULL) { |
| 277 | logger(ctx, LOG_ERR, "%s: %m", __func__); |
| 278 | return -1; |
| 279 | } |
| 280 | if (prefix) |
| 281 | snprintf(**e, len, "%s_%s=%s", prefix, var, value); |
| 282 | else |
| 283 | snprintf(**e, len, "%s=%s", var, value); |
| 284 | (*e)++; |
| 285 | return (ssize_t)len; |
| 286 | } |
| 287 | |
| 288 | ssize_t |
| 289 | setvard(struct dhcpcd_ctx *ctx, |
| 290 | char ***e, const char *prefix, const char *var, size_t value) |
| 291 | { |
| 292 | char buffer[32]; |
| 293 | |
| 294 | snprintf(buffer, sizeof(buffer), "%zu", value); |
| 295 | return setvar(ctx, e, prefix, var, buffer); |
| 296 | } |
| 297 | |
| 298 | |
| 299 | time_t |
| 300 | uptime(void) |
| 301 | { |
| 302 | struct timespec tv; |
| 303 | |
| 304 | if (get_monotonic(&tv) == -1) |
| 305 | return -1; |
| 306 | return tv.tv_sec; |
| 307 | } |
| 308 | |
| 309 | char * |
| 310 | hwaddr_ntoa(const unsigned char *hwaddr, size_t hwlen, char *buf, size_t buflen) |
| 311 | { |
| 312 | char *p; |
| 313 | size_t i; |
| 314 | |
| 315 | if (buf == NULL) { |
| 316 | return NULL; |
| 317 | } |
| 318 | |
| 319 | if (hwlen * 3 > buflen) { |
| 320 | errno = ENOBUFS; |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | p = buf; |
| 325 | for (i = 0; i < hwlen; i++) { |
| 326 | if (i > 0) |
| 327 | *p ++= ':'; |
| 328 | p += snprintf(p, 3, "%.2x", hwaddr[i]); |
| 329 | } |
| 330 | *p ++= '\0'; |
| 331 | return buf; |
| 332 | } |
| 333 | |
| 334 | size_t |
| 335 | hwaddr_aton(unsigned char *buffer, const char *addr) |
| 336 | { |
| 337 | char c[3]; |
| 338 | const char *p = addr; |
| 339 | unsigned char *bp = buffer; |
| 340 | size_t len = 0; |
| 341 | |
| 342 | c[2] = '\0'; |
| 343 | while (*p) { |
| 344 | c[0] = *p++; |
| 345 | c[1] = *p++; |
| 346 | /* Ensure that digits are hex */ |
| 347 | if (isxdigit((unsigned char)c[0]) == 0 || |
| 348 | isxdigit((unsigned char)c[1]) == 0) |
| 349 | { |
| 350 | errno = EINVAL; |
| 351 | return 0; |
| 352 | } |
| 353 | /* We should have at least two entries 00:01 */ |
| 354 | if (len == 0 && *p == '\0') { |
| 355 | errno = EINVAL; |
| 356 | return 0; |
| 357 | } |
| 358 | /* Ensure that next data is EOL or a seperator with data */ |
| 359 | if (!(*p == '\0' || (*p == ':' && *(p + 1) != '\0'))) { |
| 360 | errno = EINVAL; |
| 361 | return 0; |
| 362 | } |
| 363 | if (*p) |
| 364 | p++; |
| 365 | if (bp) |
| 366 | *bp++ = (unsigned char)strtol(c, NULL, 16); |
| 367 | len++; |
| 368 | } |
| 369 | return len; |
| 370 | } |