| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <assert.h> |
| 21 | #include <limits.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <unistd.h> |
| 28 | #include <errno.h> |
| 29 | |
| 30 | #include <common/common.h> |
| 31 | |
| 32 | #include "sessiond-comm.h" |
| 33 | |
| 34 | /* For Unix socket */ |
| 35 | #include "unix.h" |
| 36 | /* For Inet socket */ |
| 37 | #include "inet.h" |
| 38 | /* For Inet6 socket */ |
| 39 | #include "inet6.h" |
| 40 | |
| 41 | #define NETWORK_TIMEOUT_ENV "LTTNG_NETWORK_SOCKET_TIMEOUT" |
| 42 | |
| 43 | static struct lttcomm_net_family net_families[] = { |
| 44 | { LTTCOMM_INET, lttcomm_create_inet_sock }, |
| 45 | { LTTCOMM_INET6, lttcomm_create_inet6_sock }, |
| 46 | }; |
| 47 | |
| 48 | /* |
| 49 | * Human readable error message. |
| 50 | */ |
| 51 | static const char *lttcomm_readable_code[] = { |
| 52 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) ] = "consumerd command socket ready", |
| 53 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SUCCESS_RECV_FD) ] = "consumerd success on receiving fds", |
| 54 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_ERROR_RECV_FD) ] = "consumerd error on receiving fds", |
| 55 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_ERROR_RECV_CMD) ] = "consumerd error on receiving command", |
| 56 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_POLL_ERROR) ] = "consumerd error in polling thread", |
| 57 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_POLL_NVAL) ] = "consumerd polling on closed fd", |
| 58 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_POLL_HUP) ] = "consumerd all fd hung up", |
| 59 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_EXIT_SUCCESS) ] = "consumerd exiting normally", |
| 60 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_EXIT_FAILURE) ] = "consumerd exiting on error", |
| 61 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_OUTFD_ERROR) ] = "consumerd error opening the tracefile", |
| 62 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_EBADF) ] = "consumerd splice EBADF", |
| 63 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_EINVAL) ] = "consumerd splice EINVAL", |
| 64 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_ENOMEM) ] = "consumerd splice ENOMEM", |
| 65 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_SPLICE_ESPIPE) ] = "consumerd splice ESPIPE", |
| 66 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_ENOMEM) ] = "Consumer is out of memory", |
| 67 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_ERROR_METADATA) ] = "Error with metadata", |
| 68 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_FATAL) ] = "Fatal error", |
| 69 | [ LTTCOMM_ERR_INDEX(LTTCOMM_CONSUMERD_RELAYD_FAIL) ] = "Error on remote relayd", |
| 70 | |
| 71 | /* Last element */ |
| 72 | [ LTTCOMM_ERR_INDEX(LTTCOMM_NR) ] = "Unknown error code" |
| 73 | }; |
| 74 | |
| 75 | static unsigned long network_timeout; |
| 76 | |
| 77 | /* |
| 78 | * Return ptr to string representing a human readable error code from the |
| 79 | * lttcomm_return_code enum. |
| 80 | * |
| 81 | * These code MUST be negative in other to treat that as an error value. |
| 82 | */ |
| 83 | LTTNG_HIDDEN |
| 84 | const char *lttcomm_get_readable_code(enum lttcomm_return_code code) |
| 85 | { |
| 86 | code = -code; |
| 87 | |
| 88 | if (code < LTTCOMM_CONSUMERD_COMMAND_SOCK_READY || code > LTTCOMM_NR) { |
| 89 | code = LTTCOMM_NR; |
| 90 | } |
| 91 | |
| 92 | return lttcomm_readable_code[LTTCOMM_ERR_INDEX(code)]; |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | * Create socket from an already allocated lttcomm socket structure and init |
| 97 | * sockaddr in the lttcomm sock. |
| 98 | */ |
| 99 | LTTNG_HIDDEN |
| 100 | int lttcomm_create_sock(struct lttcomm_sock *sock) |
| 101 | { |
| 102 | int ret, _sock_type, _sock_proto, domain; |
| 103 | |
| 104 | assert(sock); |
| 105 | |
| 106 | domain = sock->sockaddr.type; |
| 107 | if (domain != LTTCOMM_INET && domain != LTTCOMM_INET6) { |
| 108 | ERR("Create socket of unknown domain %d", domain); |
| 109 | ret = -1; |
| 110 | goto error; |
| 111 | } |
| 112 | |
| 113 | switch (sock->proto) { |
| 114 | case LTTCOMM_SOCK_UDP: |
| 115 | _sock_type = SOCK_DGRAM; |
| 116 | _sock_proto = IPPROTO_UDP; |
| 117 | break; |
| 118 | case LTTCOMM_SOCK_TCP: |
| 119 | _sock_type = SOCK_STREAM; |
| 120 | _sock_proto = IPPROTO_TCP; |
| 121 | break; |
| 122 | default: |
| 123 | ret = -1; |
| 124 | goto error; |
| 125 | } |
| 126 | |
| 127 | ret = net_families[domain].create(sock, _sock_type, _sock_proto); |
| 128 | if (ret < 0) { |
| 129 | goto error; |
| 130 | } |
| 131 | |
| 132 | error: |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Return allocated lttcomm socket structure. |
| 138 | */ |
| 139 | LTTNG_HIDDEN |
| 140 | struct lttcomm_sock *lttcomm_alloc_sock(enum lttcomm_sock_proto proto) |
| 141 | { |
| 142 | struct lttcomm_sock *sock; |
| 143 | |
| 144 | sock = zmalloc(sizeof(struct lttcomm_sock)); |
| 145 | if (sock == NULL) { |
| 146 | PERROR("zmalloc create sock"); |
| 147 | goto end; |
| 148 | } |
| 149 | |
| 150 | sock->proto = proto; |
| 151 | sock->fd = -1; |
| 152 | |
| 153 | end: |
| 154 | return sock; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Return an allocated lttcomm socket structure and copy src content into |
| 159 | * the newly created socket. |
| 160 | * |
| 161 | * This is mostly useful when lttcomm_sock are passed between process where the |
| 162 | * fd and ops have to be changed within the correct address space. |
| 163 | */ |
| 164 | LTTNG_HIDDEN |
| 165 | struct lttcomm_sock *lttcomm_alloc_copy_sock(struct lttcomm_sock *src) |
| 166 | { |
| 167 | struct lttcomm_sock *sock; |
| 168 | |
| 169 | /* Safety net */ |
| 170 | assert(src); |
| 171 | |
| 172 | sock = lttcomm_alloc_sock(src->proto); |
| 173 | if (sock == NULL) { |
| 174 | goto alloc_error; |
| 175 | } |
| 176 | |
| 177 | lttcomm_copy_sock(sock, src); |
| 178 | |
| 179 | alloc_error: |
| 180 | return sock; |
| 181 | } |
| 182 | |
| 183 | /* |
| 184 | * Create and copy socket from an allocated lttcomm socket structure. |
| 185 | * |
| 186 | * This is mostly useful when lttcomm_sock are passed between process where the |
| 187 | * fd and ops have to be changed within the correct address space. |
| 188 | */ |
| 189 | LTTNG_HIDDEN |
| 190 | void lttcomm_copy_sock(struct lttcomm_sock *dst, struct lttcomm_sock *src) |
| 191 | { |
| 192 | /* Safety net */ |
| 193 | assert(dst); |
| 194 | assert(src); |
| 195 | |
| 196 | dst->proto = src->proto; |
| 197 | dst->fd = src->fd; |
| 198 | dst->ops = src->ops; |
| 199 | /* Copy sockaddr information from original socket */ |
| 200 | memcpy(&dst->sockaddr, &src->sockaddr, sizeof(dst->sockaddr)); |
| 201 | } |
| 202 | |
| 203 | /* |
| 204 | * Init IPv4 sockaddr structure. |
| 205 | */ |
| 206 | LTTNG_HIDDEN |
| 207 | int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr *sockaddr, |
| 208 | const char *ip, unsigned int port) |
| 209 | { |
| 210 | int ret; |
| 211 | |
| 212 | assert(sockaddr); |
| 213 | assert(ip); |
| 214 | assert(port > 0 && port <= 65535); |
| 215 | |
| 216 | memset(sockaddr, 0, sizeof(struct lttcomm_sockaddr)); |
| 217 | |
| 218 | sockaddr->type = LTTCOMM_INET; |
| 219 | sockaddr->addr.sin.sin_family = AF_INET; |
| 220 | sockaddr->addr.sin.sin_port = htons(port); |
| 221 | ret = inet_pton(sockaddr->addr.sin.sin_family, ip, |
| 222 | &sockaddr->addr.sin.sin_addr); |
| 223 | if (ret < 1) { |
| 224 | ret = -1; |
| 225 | ERR("%s with port %d: unrecognized IPv4 address", ip, port); |
| 226 | goto error; |
| 227 | } |
| 228 | memset(sockaddr->addr.sin.sin_zero, 0, sizeof(sockaddr->addr.sin.sin_zero)); |
| 229 | |
| 230 | error: |
| 231 | return ret; |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Init IPv6 sockaddr structure. |
| 236 | */ |
| 237 | LTTNG_HIDDEN |
| 238 | int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr *sockaddr, |
| 239 | const char *ip, unsigned int port) |
| 240 | { |
| 241 | int ret; |
| 242 | |
| 243 | assert(sockaddr); |
| 244 | assert(ip); |
| 245 | assert(port > 0 && port <= 65535); |
| 246 | |
| 247 | memset(sockaddr, 0, sizeof(struct lttcomm_sockaddr)); |
| 248 | |
| 249 | sockaddr->type = LTTCOMM_INET6; |
| 250 | sockaddr->addr.sin6.sin6_family = AF_INET6; |
| 251 | sockaddr->addr.sin6.sin6_port = htons(port); |
| 252 | ret = inet_pton(sockaddr->addr.sin6.sin6_family, ip, |
| 253 | &sockaddr->addr.sin6.sin6_addr); |
| 254 | if (ret < 1) { |
| 255 | ret = -1; |
| 256 | goto error; |
| 257 | } |
| 258 | |
| 259 | error: |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Return allocated lttcomm socket structure from lttng URI. |
| 265 | */ |
| 266 | LTTNG_HIDDEN |
| 267 | struct lttcomm_sock *lttcomm_alloc_sock_from_uri(struct lttng_uri *uri) |
| 268 | { |
| 269 | int ret; |
| 270 | int _sock_proto; |
| 271 | struct lttcomm_sock *sock = NULL; |
| 272 | |
| 273 | /* Safety net */ |
| 274 | assert(uri); |
| 275 | |
| 276 | /* Check URI protocol */ |
| 277 | if (uri->proto == LTTNG_TCP) { |
| 278 | _sock_proto = LTTCOMM_SOCK_TCP; |
| 279 | } else { |
| 280 | ERR("Relayd invalid URI proto: %d", uri->proto); |
| 281 | goto alloc_error; |
| 282 | } |
| 283 | |
| 284 | sock = lttcomm_alloc_sock(_sock_proto); |
| 285 | if (sock == NULL) { |
| 286 | goto alloc_error; |
| 287 | } |
| 288 | |
| 289 | /* Check destination type */ |
| 290 | if (uri->dtype == LTTNG_DST_IPV4) { |
| 291 | ret = lttcomm_init_inet_sockaddr(&sock->sockaddr, uri->dst.ipv4, |
| 292 | uri->port); |
| 293 | if (ret < 0) { |
| 294 | goto error; |
| 295 | } |
| 296 | } else if (uri->dtype == LTTNG_DST_IPV6) { |
| 297 | ret = lttcomm_init_inet6_sockaddr(&sock->sockaddr, uri->dst.ipv6, |
| 298 | uri->port); |
| 299 | if (ret < 0) { |
| 300 | goto error; |
| 301 | } |
| 302 | } else { |
| 303 | /* Command URI is invalid */ |
| 304 | ERR("Relayd invalid URI dst type: %d", uri->dtype); |
| 305 | goto error; |
| 306 | } |
| 307 | |
| 308 | return sock; |
| 309 | |
| 310 | error: |
| 311 | lttcomm_destroy_sock(sock); |
| 312 | alloc_error: |
| 313 | return NULL; |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * Destroy and free lttcomm socket. |
| 318 | */ |
| 319 | LTTNG_HIDDEN |
| 320 | void lttcomm_destroy_sock(struct lttcomm_sock *sock) |
| 321 | { |
| 322 | free(sock); |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Allocate and return a relayd socket object using a given URI to initialize |
| 327 | * it and the major/minor version of the supported protocol. |
| 328 | * |
| 329 | * On error, NULL is returned. |
| 330 | */ |
| 331 | LTTNG_HIDDEN |
| 332 | struct lttcomm_relayd_sock *lttcomm_alloc_relayd_sock(struct lttng_uri *uri, |
| 333 | uint32_t major, uint32_t minor) |
| 334 | { |
| 335 | int ret; |
| 336 | struct lttcomm_sock *tmp_sock = NULL; |
| 337 | struct lttcomm_relayd_sock *rsock = NULL; |
| 338 | |
| 339 | assert(uri); |
| 340 | |
| 341 | rsock = zmalloc(sizeof(*rsock)); |
| 342 | if (!rsock) { |
| 343 | PERROR("zmalloc relayd sock"); |
| 344 | goto error; |
| 345 | } |
| 346 | |
| 347 | /* Allocate socket object from URI */ |
| 348 | tmp_sock = lttcomm_alloc_sock_from_uri(uri); |
| 349 | if (tmp_sock == NULL) { |
| 350 | goto error_free; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Create socket object which basically sets the ops according to the |
| 355 | * socket protocol. |
| 356 | */ |
| 357 | lttcomm_copy_sock(&rsock->sock, tmp_sock); |
| 358 | /* Temporary socket pointer not needed anymore. */ |
| 359 | lttcomm_destroy_sock(tmp_sock); |
| 360 | ret = lttcomm_create_sock(&rsock->sock); |
| 361 | if (ret < 0) { |
| 362 | goto error_free; |
| 363 | } |
| 364 | |
| 365 | rsock->major = major; |
| 366 | rsock->minor = minor; |
| 367 | |
| 368 | return rsock; |
| 369 | |
| 370 | error_free: |
| 371 | free(rsock); |
| 372 | error: |
| 373 | return NULL; |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Set socket receiving timeout. |
| 378 | */ |
| 379 | LTTNG_HIDDEN |
| 380 | int lttcomm_setsockopt_rcv_timeout(int sock, unsigned int msec) |
| 381 | { |
| 382 | int ret; |
| 383 | struct timeval tv; |
| 384 | |
| 385 | tv.tv_sec = msec / 1000; |
| 386 | tv.tv_usec = (msec % 1000) * 1000; |
| 387 | |
| 388 | ret = setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)); |
| 389 | if (ret < 0) { |
| 390 | PERROR("setsockopt SO_RCVTIMEO"); |
| 391 | } |
| 392 | |
| 393 | return ret; |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Set socket sending timeout. |
| 398 | */ |
| 399 | LTTNG_HIDDEN |
| 400 | int lttcomm_setsockopt_snd_timeout(int sock, unsigned int msec) |
| 401 | { |
| 402 | int ret; |
| 403 | struct timeval tv; |
| 404 | |
| 405 | tv.tv_sec = msec / 1000; |
| 406 | tv.tv_usec = (msec % 1000) * 1000; |
| 407 | |
| 408 | ret = setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); |
| 409 | if (ret < 0) { |
| 410 | PERROR("setsockopt SO_SNDTIMEO"); |
| 411 | } |
| 412 | |
| 413 | return ret; |
| 414 | } |
| 415 | |
| 416 | LTTNG_HIDDEN |
| 417 | void lttcomm_init(void) |
| 418 | { |
| 419 | const char *env; |
| 420 | |
| 421 | env = getenv(NETWORK_TIMEOUT_ENV); |
| 422 | if (env) { |
| 423 | long timeout; |
| 424 | |
| 425 | errno = 0; |
| 426 | timeout = strtol(env, NULL, 0); |
| 427 | if (errno != 0 || timeout < -1L) { |
| 428 | PERROR("Network timeout"); |
| 429 | } else { |
| 430 | if (timeout > 0) { |
| 431 | network_timeout = timeout; |
| 432 | } |
| 433 | } |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | LTTNG_HIDDEN |
| 438 | unsigned long lttcomm_get_network_timeout(void) |
| 439 | { |
| 440 | return network_timeout; |
| 441 | } |