Jorge Lucangeli Obes | a6b034d | 2012-08-07 15:29:20 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| 2 | * Use of this source code is governed by a BSD-style license that can be |
| 3 | * found in the LICENSE file. |
| 4 | */ |
| 5 | |
Jorge Lucangeli Obes | 0b20877 | 2017-04-19 14:15:46 -0400 | [diff] [blame] | 6 | #include "util.h" |
| 7 | |
Jorge Lucangeli Obes | a6b034d | 2012-08-07 15:29:20 -0700 | [diff] [blame] | 8 | #include <ctype.h> |
Jorge Lucangeli Obes | f205fff | 2016-08-06 09:06:21 -0400 | [diff] [blame] | 9 | #include <errno.h> |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 10 | #include <limits.h> |
Luis Hector Chavez | 114a930 | 2017-09-05 20:36:58 -0700 | [diff] [blame] | 11 | #include <stdarg.h> |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 12 | #include <stdbool.h> |
Martin Pelikán | ab9eb44 | 2017-01-25 11:53:58 +1100 | [diff] [blame] | 13 | #include <stdint.h> |
Luis Hector Chavez | 40b2574 | 2013-09-22 19:44:06 -0700 | [diff] [blame] | 14 | #include <stdio.h> |
Jorge Lucangeli Obes | a6b034d | 2012-08-07 15:29:20 -0700 | [diff] [blame] | 15 | #include <string.h> |
Jorge Lucangeli Obes | a6b034d | 2012-08-07 15:29:20 -0700 | [diff] [blame] | 16 | |
Luis Hector Chavez | 40b2574 | 2013-09-22 19:44:06 -0700 | [diff] [blame] | 17 | #include "libconstants.h" |
Jorge Lucangeli Obes | a6b034d | 2012-08-07 15:29:20 -0700 | [diff] [blame] | 18 | #include "libsyscalls.h" |
| 19 | |
Mike Frysinger | fccb4c9 | 2013-10-19 02:42:07 -0400 | [diff] [blame] | 20 | /* |
| 21 | * These are syscalls used by the syslog() C library call. You can find them |
| 22 | * by running a simple test program. See below for x86_64 behavior: |
| 23 | * $ cat test.c |
Jorge Lucangeli Obes | b98ad29 | 2016-01-25 15:07:30 -0800 | [diff] [blame] | 24 | * #include <syslog.h> |
Mike Frysinger | fccb4c9 | 2013-10-19 02:42:07 -0400 | [diff] [blame] | 25 | * main() { syslog(0, "foo"); } |
| 26 | * $ gcc test.c -static |
| 27 | * $ strace ./a.out |
| 28 | * ... |
| 29 | * socket(PF_FILE, SOCK_DGRAM|SOCK_CLOEXEC, 0) = 3 <- look for socket connection |
| 30 | * connect(...) <- important |
| 31 | * sendto(...) <- important |
| 32 | * exit_group(0) <- finish! |
| 33 | */ |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 34 | #if defined(__x86_64__) |
Jorge Lucangeli Obes | b98ad29 | 2016-01-25 15:07:30 -0800 | [diff] [blame] | 35 | #if defined(__ANDROID__) |
| 36 | const char *log_syscalls[] = {"socket", "connect", "fcntl", "writev"}; |
Alex Deymo | 7c6899c | 2016-01-27 18:24:19 -0800 | [diff] [blame] | 37 | #else |
Zach Reizner | b1f517e | 2018-03-30 16:44:26 -0700 | [diff] [blame] | 38 | const char *log_syscalls[] = {"socket", "connect", "sendto", "writev"}; |
Jorge Lucangeli Obes | b98ad29 | 2016-01-25 15:07:30 -0800 | [diff] [blame] | 39 | #endif |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 40 | #elif defined(__i386__) |
Jeff Vander Stoep | 1482f20 | 2016-01-07 11:21:31 -0800 | [diff] [blame] | 41 | #if defined(__ANDROID__) |
Jorge Lucangeli Obes | b98ad29 | 2016-01-25 15:07:30 -0800 | [diff] [blame] | 42 | const char *log_syscalls[] = {"socketcall", "writev", "fcntl64", |
| 43 | "clock_gettime"}; |
Jeff Vander Stoep | 1482f20 | 2016-01-07 11:21:31 -0800 | [diff] [blame] | 44 | #else |
Sonny Rao | 33d4985 | 2018-05-18 13:38:43 -0700 | [diff] [blame] | 45 | const char *log_syscalls[] = {"socketcall", "time", "writev"}; |
Jeff Vander Stoep | 1482f20 | 2016-01-07 11:21:31 -0800 | [diff] [blame] | 46 | #endif |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 47 | #elif defined(__arm__) |
Jeff Vander Stoep | d38f399 | 2015-12-02 10:54:51 -0800 | [diff] [blame] | 48 | #if defined(__ANDROID__) |
Jorge Lucangeli Obes | b98ad29 | 2016-01-25 15:07:30 -0800 | [diff] [blame] | 49 | const char *log_syscalls[] = {"clock_gettime", "connect", "fcntl64", "socket", |
| 50 | "writev"}; |
Jeff Vander Stoep | d38f399 | 2015-12-02 10:54:51 -0800 | [diff] [blame] | 51 | #else |
Sonny Rao | 33d4985 | 2018-05-18 13:38:43 -0700 | [diff] [blame] | 52 | const char *log_syscalls[] = {"socket", "connect", "gettimeofday", "send", |
| 53 | "writev"}; |
Jeff Vander Stoep | d38f399 | 2015-12-02 10:54:51 -0800 | [diff] [blame] | 54 | #endif |
| 55 | #elif defined(__aarch64__) |
| 56 | #if defined(__ANDROID__) |
Jorge Lucangeli Obes | b98ad29 | 2016-01-25 15:07:30 -0800 | [diff] [blame] | 57 | const char *log_syscalls[] = {"connect", "fcntl", "sendto", "socket", "writev"}; |
Jeff Vander Stoep | d38f399 | 2015-12-02 10:54:51 -0800 | [diff] [blame] | 58 | #else |
Sonny Rao | 33d4985 | 2018-05-18 13:38:43 -0700 | [diff] [blame] | 59 | const char *log_syscalls[] = {"socket", "connect", "send", "writev"}; |
Jeff Vander Stoep | d38f399 | 2015-12-02 10:54:51 -0800 | [diff] [blame] | 60 | #endif |
Jorge Lucangeli Obes | b98ad29 | 2016-01-25 15:07:30 -0800 | [diff] [blame] | 61 | #elif defined(__powerpc__) || defined(__ia64__) || defined(__hppa__) || \ |
| 62 | defined(__sparc__) || defined(__mips__) |
Mike Frysinger | 0956086 | 2017-09-27 01:13:15 -0400 | [diff] [blame] | 63 | const char *log_syscalls[] = {"socket", "connect", "send"}; |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 64 | #else |
| 65 | #error "Unsupported platform" |
| 66 | #endif |
| 67 | |
Mike Frysinger | 404d2bb | 2017-01-17 19:29:00 -0500 | [diff] [blame] | 68 | const size_t log_syscalls_len = ARRAY_SIZE(log_syscalls); |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 69 | |
Luis Hector Chavez | 114a930 | 2017-09-05 20:36:58 -0700 | [diff] [blame] | 70 | /* clang-format off */ |
| 71 | static struct logging_config_t { |
| 72 | /* The logging system to use. The default is syslog. */ |
| 73 | enum logging_system_t logger; |
| 74 | |
| 75 | /* File descriptor to log to. Only used when logger is LOG_TO_FD. */ |
| 76 | int fd; |
| 77 | |
| 78 | /* Minimum priority to log. Only used when logger is LOG_TO_FD. */ |
| 79 | int min_priority; |
| 80 | } logging_config = { |
| 81 | .logger = LOG_TO_SYSLOG, |
| 82 | }; |
| 83 | /* clang-format on */ |
| 84 | |
Luis Hector Chavez | cc559e8 | 2018-07-09 13:26:31 -0700 | [diff] [blame] | 85 | #if defined(USE_EXIT_ON_DIE) |
| 86 | #define do_abort() exit(1) |
| 87 | #else |
| 88 | #define do_abort() abort() |
| 89 | #endif |
| 90 | |
Luis Hector Chavez | 31b0265 | 2018-07-09 14:14:49 -0700 | [diff] [blame] | 91 | #if defined(__clang__) |
| 92 | #define attribute_no_optimize __attribute__((optnone)) |
| 93 | #else |
| 94 | #define attribute_no_optimize __attribute__((__optimize__(0))) |
| 95 | #endif |
| 96 | |
| 97 | /* Forces the compiler to perform no optimizations on |var|. */ |
| 98 | static void attribute_no_optimize alias(const void *var) |
| 99 | { |
| 100 | (void)var; |
| 101 | } |
| 102 | |
Luis Hector Chavez | cc559e8 | 2018-07-09 13:26:31 -0700 | [diff] [blame] | 103 | void do_fatal_log(int priority, const char *format, ...) |
| 104 | { |
Luis Hector Chavez | 31b0265 | 2018-07-09 14:14:49 -0700 | [diff] [blame] | 105 | va_list args, stack_args; |
Luis Hector Chavez | cc559e8 | 2018-07-09 13:26:31 -0700 | [diff] [blame] | 106 | va_start(args, format); |
Luis Hector Chavez | 31b0265 | 2018-07-09 14:14:49 -0700 | [diff] [blame] | 107 | va_copy(stack_args, args); |
Luis Hector Chavez | cc559e8 | 2018-07-09 13:26:31 -0700 | [diff] [blame] | 108 | if (logging_config.logger == LOG_TO_SYSLOG) { |
| 109 | vsyslog(priority, format, args); |
| 110 | } else { |
| 111 | vdprintf(logging_config.fd, format, args); |
| 112 | dprintf(logging_config.fd, "\n"); |
| 113 | } |
| 114 | va_end(args); |
Luis Hector Chavez | 31b0265 | 2018-07-09 14:14:49 -0700 | [diff] [blame] | 115 | |
| 116 | /* |
| 117 | * Write another copy of the first few characters of the message into a |
| 118 | * stack-based buffer so that it can appear in minidumps. Choosing a |
| 119 | * small-ish buffer size since breakpad will only pick up the first few |
| 120 | * kilobytes of each stack, so that will prevent this buffer from |
| 121 | * kicking out other stack frames. |
| 122 | */ |
| 123 | char log_line[512]; |
| 124 | vsnprintf(log_line, sizeof(log_line), format, stack_args); |
| 125 | va_end(stack_args); |
| 126 | alias(log_line); |
Luis Hector Chavez | cc559e8 | 2018-07-09 13:26:31 -0700 | [diff] [blame] | 127 | do_abort(); |
| 128 | } |
| 129 | |
Luis Hector Chavez | 114a930 | 2017-09-05 20:36:58 -0700 | [diff] [blame] | 130 | void do_log(int priority, const char *format, ...) |
| 131 | { |
| 132 | if (logging_config.logger == LOG_TO_SYSLOG) { |
| 133 | va_list args; |
| 134 | va_start(args, format); |
| 135 | vsyslog(priority, format, args); |
| 136 | va_end(args); |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | if (logging_config.min_priority < priority) |
| 141 | return; |
| 142 | |
| 143 | va_list args; |
| 144 | va_start(args, format); |
| 145 | vdprintf(logging_config.fd, format, args); |
| 146 | va_end(args); |
| 147 | dprintf(logging_config.fd, "\n"); |
| 148 | } |
| 149 | |
Jorge Lucangeli Obes | a6b034d | 2012-08-07 15:29:20 -0700 | [diff] [blame] | 150 | int lookup_syscall(const char *name) |
| 151 | { |
| 152 | const struct syscall_entry *entry = syscall_table; |
| 153 | for (; entry->name && entry->nr >= 0; ++entry) |
| 154 | if (!strcmp(entry->name, name)) |
| 155 | return entry->nr; |
| 156 | return -1; |
| 157 | } |
| 158 | |
| 159 | const char *lookup_syscall_name(int nr) |
| 160 | { |
| 161 | const struct syscall_entry *entry = syscall_table; |
| 162 | for (; entry->name && entry->nr >= 0; ++entry) |
| 163 | if (entry->nr == nr) |
| 164 | return entry->name; |
| 165 | return NULL; |
| 166 | } |
| 167 | |
Jorge Lucangeli Obes | 7b2e29c | 2016-08-04 12:21:03 -0400 | [diff] [blame] | 168 | long int parse_single_constant(char *constant_str, char **endptr) |
| 169 | { |
| 170 | const struct constant_entry *entry = constant_table; |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 171 | long int res = 0; |
Jorge Lucangeli Obes | 7b2e29c | 2016-08-04 12:21:03 -0400 | [diff] [blame] | 172 | for (; entry->name; ++entry) { |
| 173 | if (!strcmp(entry->name, constant_str)) { |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 174 | *endptr = constant_str + strlen(constant_str); |
Jorge Lucangeli Obes | 7b2e29c | 2016-08-04 12:21:03 -0400 | [diff] [blame] | 175 | return entry->value; |
| 176 | } |
| 177 | } |
| 178 | |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 179 | errno = 0; |
| 180 | res = strtol(constant_str, endptr, 0); |
| 181 | if (errno == ERANGE) { |
| 182 | if (res == LONG_MAX) { |
| 183 | /* See if the constant fits in an unsigned long int. */ |
| 184 | errno = 0; |
| 185 | res = strtoul(constant_str, endptr, 0); |
| 186 | if (errno == ERANGE) { |
| 187 | /* |
| 188 | * On unsigned overflow, use the same convention |
| 189 | * as when strtol(3) finds no digits: set |
| 190 | * |*endptr| to |constant_str| and return 0. |
| 191 | */ |
| 192 | warn("unsigned overflow: '%s'", constant_str); |
| 193 | *endptr = constant_str; |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 194 | return 0; |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 195 | } |
| 196 | } else if (res == LONG_MIN) { |
| 197 | /* |
| 198 | * Same for signed underflow: set |*endptr| to |
| 199 | * |constant_str| and return 0. |
| 200 | */ |
| 201 | warn("signed underflow: '%s'", constant_str); |
| 202 | *endptr = constant_str; |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 203 | return 0; |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 204 | } |
| 205 | } |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 206 | if (**endptr != '\0') { |
| 207 | warn("trailing garbage after constant: '%s'", constant_str); |
| 208 | *endptr = constant_str; |
| 209 | return 0; |
| 210 | } |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 211 | return res; |
Jorge Lucangeli Obes | 7b2e29c | 2016-08-04 12:21:03 -0400 | [diff] [blame] | 212 | } |
| 213 | |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 214 | static char *tokenize_parenthesized_expression(char **stringp) |
| 215 | { |
| 216 | char *ret = NULL, *found = NULL; |
| 217 | size_t paren_count = 1; |
| 218 | |
| 219 | /* If the string is NULL, there are no parens to be found. */ |
| 220 | if (stringp == NULL || *stringp == NULL) |
| 221 | return NULL; |
| 222 | |
| 223 | /* If the string is not on an open paren, the results are undefined. */ |
| 224 | if (**stringp != '(') |
| 225 | return NULL; |
| 226 | |
| 227 | for (found = *stringp + 1; *found; ++found) { |
| 228 | switch (*found) { |
| 229 | case '(': |
| 230 | ++paren_count; |
| 231 | break; |
| 232 | case ')': |
| 233 | --paren_count; |
| 234 | if (!paren_count) { |
| 235 | *found = '\0'; |
| 236 | ret = *stringp + 1; |
| 237 | *stringp = found + 1; |
| 238 | return ret; |
| 239 | } |
| 240 | break; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | /* We got to the end without finding the closing paren. */ |
| 245 | warn("unclosed parenthesis: '%s'", *stringp); |
| 246 | return NULL; |
| 247 | } |
| 248 | |
Luis Hector Chavez | 40b2574 | 2013-09-22 19:44:06 -0700 | [diff] [blame] | 249 | long int parse_constant(char *constant_str, char **endptr) |
| 250 | { |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 251 | long int value = 0, current_value; |
Luis Hector Chavez | 2122455 | 2015-06-27 18:10:39 +0000 | [diff] [blame] | 252 | char *group, *lastpos = constant_str; |
Luis Hector Chavez | 2122455 | 2015-06-27 18:10:39 +0000 | [diff] [blame] | 253 | |
| 254 | /* |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 255 | * If |endptr| is provided, parsing errors are signaled as |endptr| |
| 256 | * pointing to |constant_str|. |
| 257 | */ |
| 258 | if (endptr) |
| 259 | *endptr = constant_str; |
| 260 | |
| 261 | /* |
| 262 | * Try to parse constant expressions. Valid constant expressions are: |
| 263 | * |
| 264 | * - A number that can be parsed with strtol(3). |
| 265 | * - A named constant expression. |
| 266 | * - A parenthesized, valid constant expression. |
| 267 | * - A valid constant expression prefixed with the unary bitwise |
| 268 | * complement operator ~. |
| 269 | * - A series of valid constant expressions separated by pipes. Note |
| 270 | * that since |constant_str| is an atom, there can be no spaces |
| 271 | * between the constant and the pipe. |
Luis Hector Chavez | 2122455 | 2015-06-27 18:10:39 +0000 | [diff] [blame] | 272 | * |
| 273 | * If there is an error parsing any of the constants, the whole process |
| 274 | * fails. |
| 275 | */ |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 276 | while (constant_str && *constant_str) { |
| 277 | bool negate = false; |
| 278 | if (*constant_str == '~') { |
| 279 | negate = true; |
| 280 | ++constant_str; |
Luis Hector Chavez | 2122455 | 2015-06-27 18:10:39 +0000 | [diff] [blame] | 281 | } |
Luis Hector Chavez | 466f231 | 2018-10-31 10:44:43 -0700 | [diff] [blame] | 282 | if (*constant_str == '(') { |
| 283 | group = |
| 284 | tokenize_parenthesized_expression(&constant_str); |
| 285 | if (group == NULL) |
| 286 | return 0; |
| 287 | char *end = group; |
| 288 | /* Recursively parse the parenthesized subexpression. */ |
| 289 | current_value = parse_constant(group, &end); |
| 290 | if (end == group) |
| 291 | return 0; |
| 292 | if (constant_str && *constant_str) { |
| 293 | /* |
| 294 | * If this is not the end of the atom, there |
| 295 | * should be another | followed by more stuff. |
| 296 | */ |
| 297 | if (*constant_str != '|') { |
| 298 | warn("unterminated constant " |
| 299 | "expression: '%s'", |
| 300 | constant_str); |
| 301 | return 0; |
| 302 | } |
| 303 | ++constant_str; |
| 304 | if (*constant_str == '\0') { |
| 305 | warn("unterminated constant " |
| 306 | "expression: '%s'", |
| 307 | constant_str); |
| 308 | return 0; |
| 309 | } |
| 310 | } |
| 311 | lastpos = end; |
| 312 | } else { |
| 313 | group = tokenize(&constant_str, "|"); |
| 314 | char *end = group; |
| 315 | current_value = parse_single_constant(group, &end); |
| 316 | if (end == group) |
| 317 | return 0; |
| 318 | lastpos = end; |
| 319 | } |
| 320 | if (negate) |
| 321 | current_value = ~current_value; |
| 322 | value |= current_value; |
Luis Hector Chavez | 2122455 | 2015-06-27 18:10:39 +0000 | [diff] [blame] | 323 | } |
| 324 | if (endptr) |
| 325 | *endptr = lastpos; |
| 326 | return value; |
| 327 | } |
| 328 | |
Martin Pelikán | ab9eb44 | 2017-01-25 11:53:58 +1100 | [diff] [blame] | 329 | /* |
| 330 | * parse_size, specified as a string with a decimal number in bytes, |
| 331 | * possibly with one 1-character suffix like "10K" or "6G". |
| 332 | * Assumes both pointers are non-NULL. |
| 333 | * |
| 334 | * Returns 0 on success, negative errno on failure. |
| 335 | * Only writes to result on success. |
| 336 | */ |
| 337 | int parse_size(size_t *result, const char *sizespec) |
| 338 | { |
| 339 | const char prefixes[] = "KMGTPE"; |
| 340 | size_t i, multiplier = 1, nsize, size = 0; |
| 341 | unsigned long long parsed; |
| 342 | const size_t len = strlen(sizespec); |
| 343 | char *end; |
| 344 | |
| 345 | if (len == 0 || sizespec[0] == '-') |
| 346 | return -EINVAL; |
| 347 | |
| 348 | for (i = 0; i < sizeof(prefixes); ++i) { |
| 349 | if (sizespec[len - 1] == prefixes[i]) { |
| 350 | #if __WORDSIZE == 32 |
| 351 | if (i >= 3) |
| 352 | return -ERANGE; |
| 353 | #endif |
| 354 | multiplier = 1024; |
| 355 | while (i-- > 0) |
| 356 | multiplier *= 1024; |
| 357 | break; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | /* We only need size_t but strtoul(3) is too small on IL32P64. */ |
| 362 | parsed = strtoull(sizespec, &end, 10); |
| 363 | if (parsed == ULLONG_MAX) |
| 364 | return -errno; |
| 365 | if (parsed >= SIZE_MAX) |
| 366 | return -ERANGE; |
| 367 | if ((multiplier != 1 && end != sizespec + len - 1) || |
| 368 | (multiplier == 1 && end != sizespec + len)) |
| 369 | return -EINVAL; |
| 370 | size = (size_t)parsed; |
| 371 | |
| 372 | nsize = size * multiplier; |
| 373 | if (nsize / multiplier != size) |
| 374 | return -ERANGE; |
| 375 | *result = nsize; |
| 376 | return 0; |
| 377 | } |
| 378 | |
Jorge Lucangeli Obes | a6b034d | 2012-08-07 15:29:20 -0700 | [diff] [blame] | 379 | char *strip(char *s) |
| 380 | { |
| 381 | char *end; |
| 382 | while (*s && isblank(*s)) |
| 383 | s++; |
| 384 | end = s + strlen(s) - 1; |
| 385 | while (end >= s && *end && (isblank(*end) || *end == '\n')) |
| 386 | end--; |
| 387 | *(end + 1) = '\0'; |
| 388 | return s; |
| 389 | } |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 390 | |
Jorge Lucangeli Obes | c8b21e1 | 2014-06-13 14:26:16 -0700 | [diff] [blame] | 391 | char *tokenize(char **stringp, const char *delim) |
| 392 | { |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 393 | char *ret = NULL; |
| 394 | |
Mike Frysinger | b4c7e77 | 2018-01-17 17:40:15 -0500 | [diff] [blame] | 395 | /* If the string is NULL, there are no tokens to be found. */ |
| 396 | if (stringp == NULL || *stringp == NULL) |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 397 | return NULL; |
| 398 | |
| 399 | /* |
| 400 | * If the delimiter is NULL or empty, |
| 401 | * the full string makes up the only token. |
| 402 | */ |
| 403 | if (delim == NULL || *delim == '\0') { |
| 404 | ret = *stringp; |
| 405 | *stringp = NULL; |
| 406 | return ret; |
| 407 | } |
| 408 | |
Mike Frysinger | b4c7e77 | 2018-01-17 17:40:15 -0500 | [diff] [blame] | 409 | char *found = strstr(*stringp, delim); |
| 410 | if (!found) { |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 411 | /* |
Mike Frysinger | b4c7e77 | 2018-01-17 17:40:15 -0500 | [diff] [blame] | 412 | * The delimiter was not found, so the full string |
| 413 | * makes up the only token, and we're done. |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 414 | */ |
Mike Frysinger | b4c7e77 | 2018-01-17 17:40:15 -0500 | [diff] [blame] | 415 | ret = *stringp; |
| 416 | *stringp = NULL; |
| 417 | } else { |
| 418 | /* There's a token here, possibly empty. That's OK. */ |
| 419 | *found = '\0'; |
| 420 | ret = *stringp; |
| 421 | *stringp = found + strlen(delim); |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 422 | } |
| 423 | |
| 424 | return ret; |
| 425 | } |
Jorge Lucangeli Obes | 7b2e29c | 2016-08-04 12:21:03 -0400 | [diff] [blame] | 426 | |
Jorge Lucangeli Obes | 7b2e29c | 2016-08-04 12:21:03 -0400 | [diff] [blame] | 427 | char *path_join(const char *external_path, const char *internal_path) |
| 428 | { |
| 429 | char *path; |
| 430 | size_t pathlen; |
| 431 | |
| 432 | /* One extra char for '/' and one for '\0', hence + 2. */ |
| 433 | pathlen = strlen(external_path) + strlen(internal_path) + 2; |
| 434 | path = malloc(pathlen); |
| 435 | snprintf(path, pathlen, "%s/%s", external_path, internal_path); |
| 436 | |
| 437 | return path; |
| 438 | } |
| 439 | |
| 440 | void *consumebytes(size_t length, char **buf, size_t *buflength) |
| 441 | { |
| 442 | char *p = *buf; |
| 443 | if (length > *buflength) |
| 444 | return NULL; |
| 445 | *buf += length; |
| 446 | *buflength -= length; |
| 447 | return p; |
| 448 | } |
| 449 | |
| 450 | char *consumestr(char **buf, size_t *buflength) |
| 451 | { |
| 452 | size_t len = strnlen(*buf, *buflength); |
| 453 | if (len == *buflength) |
| 454 | /* There's no null-terminator. */ |
| 455 | return NULL; |
| 456 | return consumebytes(len + 1, buf, buflength); |
| 457 | } |
Luis Hector Chavez | 114a930 | 2017-09-05 20:36:58 -0700 | [diff] [blame] | 458 | |
| 459 | void init_logging(enum logging_system_t logger, int fd, int min_priority) |
| 460 | { |
| 461 | logging_config.logger = logger; |
| 462 | logging_config.fd = fd; |
| 463 | logging_config.min_priority = min_priority; |
| 464 | } |