| 1 | /* |
| 2 | * Copyright (c) 2011 David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <assert.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <ctype.h> |
| 22 | #include <limits.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/socket.h> |
| 25 | #include <signal.h> |
| 26 | #include <netinet/in.h> |
| 27 | #include <arpa/inet.h> |
| 28 | |
| 29 | #include <common/error.h> |
| 30 | #include <common/utils.h> |
| 31 | |
| 32 | #include "conf.h" |
| 33 | #include "utils.h" |
| 34 | #include "command.h" |
| 35 | |
| 36 | static const char *str_kernel = "Kernel"; |
| 37 | static const char *str_ust = "UST"; |
| 38 | static const char *str_jul = "JUL"; |
| 39 | |
| 40 | /* |
| 41 | * get_session_name |
| 42 | * |
| 43 | * Return allocated string with the session name found in the config |
| 44 | * directory. |
| 45 | */ |
| 46 | char *get_session_name(void) |
| 47 | { |
| 48 | char *path, *session_name = NULL; |
| 49 | |
| 50 | /* Get path to config file */ |
| 51 | path = utils_get_home_dir(); |
| 52 | if (path == NULL) { |
| 53 | goto error; |
| 54 | } |
| 55 | |
| 56 | /* Get session name from config */ |
| 57 | session_name = config_read_session_name(path); |
| 58 | if (session_name == NULL) { |
| 59 | goto error; |
| 60 | } |
| 61 | |
| 62 | DBG2("Config file path found: %s", path); |
| 63 | DBG("Session name found: %s", session_name); |
| 64 | return session_name; |
| 65 | |
| 66 | error: |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * list_commands |
| 72 | * |
| 73 | * List commands line by line. This is mostly for bash auto completion and to |
| 74 | * avoid difficult parsing. |
| 75 | */ |
| 76 | void list_commands(struct cmd_struct *commands, FILE *ofp) |
| 77 | { |
| 78 | int i = 0; |
| 79 | struct cmd_struct *cmd = NULL; |
| 80 | |
| 81 | cmd = &commands[i]; |
| 82 | while (cmd->name != NULL) { |
| 83 | fprintf(ofp, "%s\n", cmd->name); |
| 84 | i++; |
| 85 | cmd = &commands[i]; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * list_cmd_options |
| 91 | * |
| 92 | * Prints a simple list of the options available to a command. This is intended |
| 93 | * to be easily parsed for bash completion. |
| 94 | */ |
| 95 | void list_cmd_options(FILE *ofp, struct poptOption *options) |
| 96 | { |
| 97 | int i; |
| 98 | struct poptOption *option = NULL; |
| 99 | |
| 100 | for (i = 0; options[i].longName != NULL; i++) { |
| 101 | option = &options[i]; |
| 102 | |
| 103 | fprintf(ofp, "--%s\n", option->longName); |
| 104 | |
| 105 | if (isprint(option->shortName)) { |
| 106 | fprintf(ofp, "-%c\n", option->shortName); |
| 107 | } |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * fls: returns the position of the most significant bit. |
| 113 | * Returns 0 if no bit is set, else returns the position of the most |
| 114 | * significant bit (from 1 to 32 on 32-bit, from 1 to 64 on 64-bit). |
| 115 | */ |
| 116 | #if defined(__i386) || defined(__x86_64) |
| 117 | static inline |
| 118 | unsigned int fls_u32(uint32_t x) |
| 119 | { |
| 120 | int r; |
| 121 | |
| 122 | asm("bsrl %1,%0\n\t" |
| 123 | "jnz 1f\n\t" |
| 124 | "movl $-1,%0\n\t" |
| 125 | "1:\n\t" |
| 126 | : "=r" (r) : "rm" (x)); |
| 127 | return r + 1; |
| 128 | } |
| 129 | #define HAS_FLS_U32 |
| 130 | #endif |
| 131 | |
| 132 | #if defined(__x86_64) |
| 133 | static inline |
| 134 | unsigned int fls_u64(uint64_t x) |
| 135 | { |
| 136 | long r; |
| 137 | |
| 138 | asm("bsrq %1,%0\n\t" |
| 139 | "jnz 1f\n\t" |
| 140 | "movq $-1,%0\n\t" |
| 141 | "1:\n\t" |
| 142 | : "=r" (r) : "rm" (x)); |
| 143 | return r + 1; |
| 144 | } |
| 145 | #define HAS_FLS_U64 |
| 146 | #endif |
| 147 | |
| 148 | #ifndef HAS_FLS_U64 |
| 149 | static __attribute__((unused)) |
| 150 | unsigned int fls_u64(uint64_t x) |
| 151 | { |
| 152 | unsigned int r = 64; |
| 153 | |
| 154 | if (!x) |
| 155 | return 0; |
| 156 | |
| 157 | if (!(x & 0xFFFFFFFF00000000ULL)) { |
| 158 | x <<= 32; |
| 159 | r -= 32; |
| 160 | } |
| 161 | if (!(x & 0xFFFF000000000000ULL)) { |
| 162 | x <<= 16; |
| 163 | r -= 16; |
| 164 | } |
| 165 | if (!(x & 0xFF00000000000000ULL)) { |
| 166 | x <<= 8; |
| 167 | r -= 8; |
| 168 | } |
| 169 | if (!(x & 0xF000000000000000ULL)) { |
| 170 | x <<= 4; |
| 171 | r -= 4; |
| 172 | } |
| 173 | if (!(x & 0xC000000000000000ULL)) { |
| 174 | x <<= 2; |
| 175 | r -= 2; |
| 176 | } |
| 177 | if (!(x & 0x8000000000000000ULL)) { |
| 178 | x <<= 1; |
| 179 | r -= 1; |
| 180 | } |
| 181 | return r; |
| 182 | } |
| 183 | #endif |
| 184 | |
| 185 | #ifndef HAS_FLS_U32 |
| 186 | static __attribute__((unused)) |
| 187 | unsigned int fls_u32(uint32_t x) |
| 188 | { |
| 189 | unsigned int r = 32; |
| 190 | |
| 191 | if (!x) |
| 192 | return 0; |
| 193 | if (!(x & 0xFFFF0000U)) { |
| 194 | x <<= 16; |
| 195 | r -= 16; |
| 196 | } |
| 197 | if (!(x & 0xFF000000U)) { |
| 198 | x <<= 8; |
| 199 | r -= 8; |
| 200 | } |
| 201 | if (!(x & 0xF0000000U)) { |
| 202 | x <<= 4; |
| 203 | r -= 4; |
| 204 | } |
| 205 | if (!(x & 0xC0000000U)) { |
| 206 | x <<= 2; |
| 207 | r -= 2; |
| 208 | } |
| 209 | if (!(x & 0x80000000U)) { |
| 210 | x <<= 1; |
| 211 | r -= 1; |
| 212 | } |
| 213 | return r; |
| 214 | } |
| 215 | #endif |
| 216 | |
| 217 | static |
| 218 | unsigned int fls_ulong(unsigned long x) |
| 219 | { |
| 220 | #if (CAA_BITS_PER_LONG == 32) |
| 221 | return fls_u32(x); |
| 222 | #else |
| 223 | return fls_u64(x); |
| 224 | #endif |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * Return the minimum order for which x <= (1UL << order). |
| 229 | * Return -1 if x is 0. |
| 230 | */ |
| 231 | int get_count_order_u32(uint32_t x) |
| 232 | { |
| 233 | if (!x) |
| 234 | return -1; |
| 235 | |
| 236 | return fls_u32(x - 1); |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Return the minimum order for which x <= (1UL << order). |
| 241 | * Return -1 if x is 0. |
| 242 | */ |
| 243 | int get_count_order_u64(uint64_t x) |
| 244 | { |
| 245 | if (!x) |
| 246 | return -1; |
| 247 | |
| 248 | return fls_u64(x - 1); |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * Return the minimum order for which x <= (1UL << order). |
| 253 | * Return -1 if x is 0. |
| 254 | */ |
| 255 | int get_count_order_ulong(unsigned long x) |
| 256 | { |
| 257 | if (!x) |
| 258 | return -1; |
| 259 | |
| 260 | return fls_ulong(x - 1); |
| 261 | } |
| 262 | |
| 263 | const char *get_domain_str(enum lttng_domain_type domain) |
| 264 | { |
| 265 | const char *str_dom; |
| 266 | |
| 267 | switch (domain) { |
| 268 | case LTTNG_DOMAIN_KERNEL: |
| 269 | str_dom = str_kernel; |
| 270 | break; |
| 271 | case LTTNG_DOMAIN_UST: |
| 272 | str_dom = str_ust; |
| 273 | break; |
| 274 | case LTTNG_DOMAIN_JUL: |
| 275 | str_dom = str_jul; |
| 276 | break; |
| 277 | default: |
| 278 | /* Should not have an unknown domain or else define it. */ |
| 279 | assert(0); |
| 280 | } |
| 281 | |
| 282 | return str_dom; |
| 283 | } |
| 284 | |
| 285 | /* |
| 286 | * Spawn a lttng relayd daemon by forking and execv. |
| 287 | */ |
| 288 | int spawn_relayd(const char *pathname, int port) |
| 289 | { |
| 290 | int ret = 0; |
| 291 | pid_t pid; |
| 292 | char url[255]; |
| 293 | |
| 294 | if (!port) { |
| 295 | port = DEFAULT_NETWORK_VIEWER_PORT; |
| 296 | } |
| 297 | |
| 298 | ret = snprintf(url, sizeof(url), "tcp://localhost:%d", port); |
| 299 | if (ret < 0) { |
| 300 | goto end; |
| 301 | } |
| 302 | |
| 303 | MSG("Spawning a relayd daemon"); |
| 304 | pid = fork(); |
| 305 | if (pid == 0) { |
| 306 | /* |
| 307 | * Spawn session daemon and tell |
| 308 | * it to signal us when ready. |
| 309 | */ |
| 310 | execlp(pathname, "lttng-relayd", "-L", url, NULL); |
| 311 | /* execlp only returns if error happened */ |
| 312 | if (errno == ENOENT) { |
| 313 | ERR("No relayd found. Use --relayd-path."); |
| 314 | } else { |
| 315 | perror("execlp"); |
| 316 | } |
| 317 | kill(getppid(), SIGTERM); /* wake parent */ |
| 318 | exit(EXIT_FAILURE); |
| 319 | } else if (pid > 0) { |
| 320 | goto end; |
| 321 | } else { |
| 322 | perror("fork"); |
| 323 | ret = -1; |
| 324 | goto end; |
| 325 | } |
| 326 | |
| 327 | end: |
| 328 | return ret; |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Check if relayd is alive. |
| 333 | * |
| 334 | * Return 1 if found else 0 if NOT found. Negative value on error. |
| 335 | */ |
| 336 | int check_relayd(void) |
| 337 | { |
| 338 | int ret, fd; |
| 339 | struct sockaddr_in sin; |
| 340 | |
| 341 | fd = socket(AF_INET, SOCK_STREAM, 0); |
| 342 | if (fd < 0) { |
| 343 | perror("socket check relayd"); |
| 344 | goto error; |
| 345 | } |
| 346 | |
| 347 | sin.sin_family = AF_INET; |
| 348 | sin.sin_port = htons(DEFAULT_NETWORK_VIEWER_PORT); |
| 349 | ret = inet_pton(sin.sin_family, "127.0.0.1", &sin.sin_addr); |
| 350 | if (ret < 1) { |
| 351 | perror("inet_pton check relayd"); |
| 352 | goto error; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * A successful connect means the relayd exists thus returning 0 else a |
| 357 | * negative value means it does NOT exists. |
| 358 | */ |
| 359 | ret = connect(fd, &sin, sizeof(sin)); |
| 360 | if (ret < 0) { |
| 361 | /* Not found. */ |
| 362 | ret = 0; |
| 363 | } else { |
| 364 | /* Already spawned. */ |
| 365 | ret = 1; |
| 366 | } |
| 367 | |
| 368 | return ret; |
| 369 | |
| 370 | error: |
| 371 | return -1; |
| 372 | } |