1/* 2 * util.h -- set of various support routines. 3 * 4 * Copyright (c) 2001-2006, NLnet Labs. All rights reserved. 5 * 6 * See LICENSE for the license. 7 * 8 */ 9 10#ifndef UTIL_H 11#define UTIL_H 12 13#include <sys/time.h> 14#include <stdarg.h> 15#include <stdio.h> 16#include <time.h> 17struct rr; 18struct buffer; 19struct region; 20struct nsd; 21 22#ifdef HAVE_SYSLOG_H 23# include <syslog.h> 24#else 25# define LOG_ERR 3 26# define LOG_WARNING 4 27# define LOG_NOTICE 5 28# define LOG_INFO 6 29 30/* Unused, but passed to log_open. */ 31# define LOG_PID 0x01 32# define LOG_DAEMON (3<<3) 33#endif 34 35#define ALIGN_UP(n, alignment) \ 36 (((n) + (alignment) - 1) & (~((alignment) - 1))) 37#define PADDING(n, alignment) \ 38 (ALIGN_UP((n), (alignment)) - (n)) 39 40/* 41 * Initialize the logging system. All messages are logged to stderr 42 * until log_open and log_set_log_function are called. 43 */ 44void log_init(const char *ident); 45 46/* 47 * Open the system log. If FILENAME is not NULL, a log file is opened 48 * as well. 49 */ 50void log_open(int option, int facility, const char *filename); 51 52/* 53 * Reopen the logfile. 54 */ 55void log_reopen(const char *filename, uint8_t verbose); 56 57/* 58 * Finalize the logging system. 59 */ 60void log_finalize(void); 61 62/* 63 * Type of function to use for the actual logging. 64 */ 65typedef void log_function_type(int priority, const char *message); 66 67/* 68 * The function used to log to the log file. 69 */ 70log_function_type log_file; 71 72/* 73 * The function used to log to syslog. The messages are also logged 74 * using log_file. 75 */ 76log_function_type log_syslog; 77 78/* 79 * The function used to log to syslog only. 80 */ 81log_function_type log_only_syslog; 82 83/* 84 * Set the logging function to use (log_file or log_syslog). 85 */ 86void log_set_log_function(log_function_type *log_function); 87 88/* 89 * Log a message using the current log function. 90 */ 91void log_msg(int priority, const char *format, ...) 92 ATTR_FORMAT(printf, 2, 3); 93 94/* 95 * Log a message using the current log function. 96 */ 97void log_vmsg(int priority, const char *format, va_list args); 98 99/* 100 * Verbose output switch 101 */ 102extern int verbosity; 103#define VERBOSITY(level, args) \ 104 do { \ 105 if ((level) <= verbosity) { \ 106 log_msg args ; \ 107 } \ 108 } while (0) 109 110/* 111 * Set the INDEXth bit of BITS to 1. 112 */ 113void set_bit(uint8_t bits[], size_t index); 114 115/* 116 * Set the INDEXth bit of BITS to 0. 117 */ 118void clear_bit(uint8_t bits[], size_t index); 119 120/* 121 * Return the value of the INDEXth bit of BITS. 122 */ 123int get_bit(uint8_t bits[], size_t index); 124 125/* A general purpose lookup table */ 126typedef struct lookup_table lookup_table_type; 127struct lookup_table { 128 int id; 129 const char *name; 130}; 131 132/* 133 * Looks up the table entry by name, returns NULL if not found. 134 */ 135lookup_table_type *lookup_by_name(lookup_table_type table[], const char *name); 136 137/* 138 * Looks up the table entry by id, returns NULL if not found. 139 */ 140lookup_table_type *lookup_by_id(lookup_table_type table[], int id); 141 142/* 143 * (Re-)allocate SIZE bytes of memory. Report an error if the memory 144 * could not be allocated and exit the program. These functions never 145 * return NULL. 146 */ 147void *xalloc(size_t size); 148void *xmallocarray(size_t num, size_t size); 149void *xalloc_zero(size_t size); 150void *xalloc_array_zero(size_t num, size_t size); 151void *xrealloc(void *ptr, size_t size); 152char *xstrdup(const char *src); 153 154/* 155 * Mmap allocator routines. 156 * 157 */ 158#ifdef USE_MMAP_ALLOC 159void *mmap_alloc(size_t size); 160void mmap_free(void *ptr); 161#endif /* USE_MMAP_ALLOC */ 162 163/* 164 * Write SIZE bytes of DATA to FILE. Report an error on failure. 165 * 166 * Returns 0 on failure, 1 on success. 167 */ 168int write_data(FILE *file, const void *data, size_t size); 169 170/* 171 * like write_data, but keeps track of crc 172 */ 173int write_data_crc(FILE *file, const void *data, size_t size, uint32_t* crc); 174 175/* 176 * Write the complete buffer to the socket, irrespective of short 177 * writes or interrupts. This function blocks to write the data. 178 * Returns 0 on error, 1 on success. 179 */ 180int write_socket(int s, const void *data, size_t size); 181 182/* 183 * Copy data allowing for unaligned accesses in network byte order 184 * (big endian). 185 */ 186static inline void 187write_uint16(void *dst, uint16_t data) 188{ 189#ifdef ALLOW_UNALIGNED_ACCESSES 190 * (uint16_t *) dst = htons(data); 191#else 192 uint8_t *p = (uint8_t *) dst; 193 p[0] = (uint8_t) ((data >> 8) & 0xff); 194 p[1] = (uint8_t) (data & 0xff); 195#endif 196} 197 198static inline void 199write_uint32(void *dst, uint32_t data) 200{ 201#ifdef ALLOW_UNALIGNED_ACCESSES 202 * (uint32_t *) dst = htonl(data); 203#else 204 uint8_t *p = (uint8_t *) dst; 205 p[0] = (uint8_t) ((data >> 24) & 0xff); 206 p[1] = (uint8_t) ((data >> 16) & 0xff); 207 p[2] = (uint8_t) ((data >> 8) & 0xff); 208 p[3] = (uint8_t) (data & 0xff); 209#endif 210} 211 212static inline void 213write_uint64(void *dst, uint64_t data) 214{ 215 uint8_t *p = (uint8_t *) dst; 216 p[0] = (uint8_t) ((data >> 56) & 0xff); 217 p[1] = (uint8_t) ((data >> 48) & 0xff); 218 p[2] = (uint8_t) ((data >> 40) & 0xff); 219 p[3] = (uint8_t) ((data >> 32) & 0xff); 220 p[4] = (uint8_t) ((data >> 24) & 0xff); 221 p[5] = (uint8_t) ((data >> 16) & 0xff); 222 p[6] = (uint8_t) ((data >> 8) & 0xff); 223 p[7] = (uint8_t) (data & 0xff); 224} 225 226/* 227 * Copy data allowing for unaligned accesses in network byte order 228 * (big endian). 229 */ 230static inline uint16_t 231read_uint16(const void *src) 232{ 233#ifdef ALLOW_UNALIGNED_ACCESSES 234 return ntohs(* (const uint16_t *) src); 235#else 236 const uint8_t *p = (const uint8_t *) src; 237 return (p[0] << 8) | p[1]; 238#endif 239} 240 241static inline uint32_t 242read_uint32(const void *src) 243{ 244#ifdef ALLOW_UNALIGNED_ACCESSES 245 return ntohl(* (const uint32_t *) src); 246#else 247 const uint8_t *p = (const uint8_t *) src; 248 return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]; 249#endif 250} 251 252static inline uint64_t 253read_uint64(const void *src) 254{ 255 const uint8_t *p = (const uint8_t *) src; 256 return 257 ((uint64_t)p[0] << 56) | 258 ((uint64_t)p[1] << 48) | 259 ((uint64_t)p[2] << 40) | 260 ((uint64_t)p[3] << 32) | 261 ((uint64_t)p[4] << 24) | 262 ((uint64_t)p[5] << 16) | 263 ((uint64_t)p[6] << 8) | 264 (uint64_t)p[7]; 265} 266 267/* 268 * Print debugging information using log_msg, 269 * set the logfile as /dev/stdout or /dev/stderr if you like. 270 * nsd -F 0xFFFF enables all debug facilities. 271 */ 272#define DEBUG_PARSER 0x0001U 273#define DEBUG_ZONEC 0x0002U 274#define DEBUG_QUERY 0x0004U 275#define DEBUG_DBACCESS 0x0008U 276#define DEBUG_NAME_COMPRESSION 0x0010U 277#define DEBUG_XFRD 0x0020U 278#define DEBUG_IPC 0x0040U 279 280extern unsigned nsd_debug_facilities; 281extern int nsd_debug_level; 282#ifdef NDEBUG 283#define DEBUG(facility, level, args) /* empty */ 284#else 285#define DEBUG(facility, level, args) \ 286 do { \ 287 if ((facility) & nsd_debug_facilities && \ 288 (level) <= nsd_debug_level) { \ 289 log_msg args ; \ 290 } \ 291 } while (0) 292#endif 293 294/* set to true to log time prettyprinted, or false to print epoch */ 295extern int log_time_asc; 296 297/* 298 * Timespec functions. 299 */ 300int timespec_compare(const struct timespec *left, const struct timespec *right); 301void timespec_add(struct timespec *left, const struct timespec *right); 302void timespec_subtract(struct timespec *left, const struct timespec *right); 303 304static inline void 305timeval_to_timespec(struct timespec *left, 306 const struct timeval *right) 307{ 308 left->tv_sec = right->tv_sec; 309 left->tv_nsec = 1000 * right->tv_usec; 310} 311 312/* get the time */ 313void get_time(struct timespec* t); 314 315/* 316 * Converts a string representation of a period of time into 317 * a long integer of seconds or serial value. 318 * 319 * Set the endptr to the first illegal character. 320 * 321 * Interface is similar as strtol(3) 322 * 323 * Returns: 324 * LONG_MIN if underflow occurs 325 * LONG_MAX if overflow occurs. 326 * otherwise number of seconds 327 * 328 * XXX These functions do not check the range. 329 * 330 */ 331uint32_t strtoserial(const char *nptr, const char **endptr); 332uint32_t strtottl(const char *nptr, const char **endptr); 333 334/* 335 * Convert binary data to a string of hexadecimal characters. 336 */ 337ssize_t hex_ntop(uint8_t const *src, size_t srclength, char *target, 338 size_t targsize); 339ssize_t hex_pton(const char* src, uint8_t* target, size_t targsize); 340 341/* 342 * convert base32 data from and to string. Returns length. 343 * -1 on error. Use (byte count*8)%5==0. 344 */ 345int b32_pton(char const *src, uint8_t *target, size_t targsize); 346int b32_ntop(uint8_t const *src, size_t srclength, char *target, 347 size_t targsize); 348 349/* 350 * Strip trailing and leading whitespace from str. 351 */ 352void strip_string(char *str); 353 354/* 355 * Convert a single (hexadecimal) digit to its integer value. 356 */ 357int hexdigit_to_int(char ch); 358 359/* 360 * Convert TM to seconds since epoch (midnight, January 1st, 1970). 361 * Like timegm(3), which is not always available. 362 */ 363time_t mktime_from_utc(const struct tm *tm); 364 365/* 366 * Add bytes to given crc. Returns new CRC sum. 367 * Start crc val with 0xffffffff on first call. XOR crc with 368 * 0xffffffff at the end again to get final POSIX 1003.2 checksum. 369 */ 370uint32_t compute_crc(uint32_t crc, uint8_t* data, size_t len); 371 372/* 373 * Compares two 32-bit serial numbers as defined in RFC1982. Returns 374 * <0 if a < b, 0 if a == b, and >0 if a > b. The result is undefined 375 * if a != b but neither is greater or smaller (see RFC1982 section 376 * 3.2.). 377 */ 378int compare_serial(uint32_t a, uint32_t b); 379 380/* 381 * Generate a random query ID. 382 */ 383uint16_t qid_generate(void); 384/* value between 0 .. (max-1) inclusive */ 385int random_generate(int max); 386 387/* 388 * call region_destroy on (region*)data, useful for region_add_cleanup(). 389 */ 390void cleanup_region(void *data); 391 392/* 393 * Region used to store owner and origin of previous RR (used 394 * for pretty printing of zone data). 395 * Keep the same between calls to print_rr. 396 */ 397struct state_pretty_rr { 398 struct region *previous_owner_region; 399 const struct dname *previous_owner; 400 const struct dname *previous_owner_origin; 401}; 402struct state_pretty_rr* create_pretty_rr(struct region* region); 403/* print rr to file, returns 0 on failure(nothing is written) */ 404int print_rr(FILE *out, struct state_pretty_rr* state, struct rr *record, 405 struct region* tmp_region, struct buffer* tmp_buffer); 406 407/* 408 * Convert a numeric rcode value to a human readable string 409 */ 410const char* rcode2str(int rc); 411 412void addr2str( 413#ifdef INET6 414 struct sockaddr_storage *addr 415#else 416 struct sockaddr_in *addr 417#endif 418 , char* str, size_t len); 419 420/* print addr@port */ 421void addrport2str( 422#ifdef INET6 423 struct sockaddr_storage *addr 424#else 425 struct sockaddr_in *addr 426#endif 427 , char* str, size_t len); 428 429/** copy dirname string and append slash. Previous dirname is leaked, 430 * but it is to be used once, at startup, for chroot */ 431void append_trailing_slash(const char** dirname, struct region* region); 432 433/** true if filename starts with chroot or is not absolute */ 434int file_inside_chroot(const char* fname, const char* chr); 435 436/** Something went wrong, give error messages and exit. */ 437void error(const char *format, ...) ATTR_FORMAT(printf, 1, 2) ATTR_NORETURN; 438 439#if HAVE_CPUSET_T 440int number_of_cpus(void); 441int set_cpu_affinity(cpuset_t *set); 442#endif 443 444/* Add a cookie secret. If there are no secrets yet, the secret will become 445 * the active secret. Otherwise it will become the staging secret. 446 * Active secrets are used to both verify and create new DNS Cookies. 447 * Staging secrets are only used to verify DNS Cookies. */ 448void add_cookie_secret(struct nsd* nsd, uint8_t* secret); 449/* Makes the staging cookie secret active and the active secret staging. */ 450void activate_cookie_secret(struct nsd* nsd); 451/* Drop a cookie secret. Drops the staging secret. An active secret will not 452 * be dropped. */ 453void drop_cookie_secret(struct nsd* nsd); 454#endif /* UTIL_H */ 455