| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <stdarg.h> |
| 4 | #include <unistd.h> |
| 5 | #include <limits.h> |
| 6 | #include <errno.h> |
| 7 | #include <fcntl.h> |
| 8 | #include <sys/poll.h> |
| 9 | #include <sys/types.h> |
| 10 | #include <sys/wait.h> |
| 11 | #include <sys/mman.h> |
| 12 | #include <netinet/in.h> |
| 13 | #include <arpa/inet.h> |
| 14 | #include <netdb.h> |
| 15 | #include <syslog.h> |
| 16 | |
| 17 | #include "fio.h" |
| 18 | #include "server.h" |
| 19 | #include "crc/crc16.h" |
| 20 | |
| 21 | int fio_net_port = 8765; |
| 22 | |
| 23 | int exit_backend = 0; |
| 24 | |
| 25 | static char *job_buf; |
| 26 | static unsigned int job_cur_len; |
| 27 | static unsigned int job_max_len; |
| 28 | |
| 29 | static int server_fd = -1; |
| 30 | |
| 31 | int fio_send_data(int sk, const void *p, unsigned int len) |
| 32 | { |
| 33 | assert(len <= sizeof(struct fio_net_cmd) + FIO_SERVER_MAX_PDU); |
| 34 | |
| 35 | do { |
| 36 | int ret = send(sk, p, len, 0); |
| 37 | |
| 38 | if (ret > 0) { |
| 39 | len -= ret; |
| 40 | if (!len) |
| 41 | break; |
| 42 | p += ret; |
| 43 | continue; |
| 44 | } else if (!ret) |
| 45 | break; |
| 46 | else if (errno == EAGAIN || errno == EINTR) |
| 47 | continue; |
| 48 | } while (!exit_backend); |
| 49 | |
| 50 | if (!len) |
| 51 | return 0; |
| 52 | |
| 53 | return 1; |
| 54 | } |
| 55 | |
| 56 | int fio_recv_data(int sk, void *p, unsigned int len) |
| 57 | { |
| 58 | do { |
| 59 | int ret = recv(sk, p, len, MSG_WAITALL); |
| 60 | |
| 61 | if (ret > 0) { |
| 62 | len -= ret; |
| 63 | if (!len) |
| 64 | break; |
| 65 | p += ret; |
| 66 | continue; |
| 67 | } else if (!ret) |
| 68 | break; |
| 69 | else if (errno == EAGAIN || errno == EINTR) |
| 70 | continue; |
| 71 | } while (!exit_backend); |
| 72 | |
| 73 | if (!len) |
| 74 | return 0; |
| 75 | |
| 76 | return -1; |
| 77 | } |
| 78 | |
| 79 | static int verify_convert_cmd(struct fio_net_cmd *cmd) |
| 80 | { |
| 81 | uint16_t crc; |
| 82 | |
| 83 | cmd->cmd_crc16 = le16_to_cpu(cmd->cmd_crc16); |
| 84 | cmd->pdu_crc16 = le16_to_cpu(cmd->pdu_crc16); |
| 85 | |
| 86 | crc = crc16(cmd, FIO_NET_CMD_CRC_SZ); |
| 87 | if (crc != cmd->cmd_crc16) { |
| 88 | log_err("fio: server bad crc on command (got %x, wanted %x)\n", |
| 89 | cmd->cmd_crc16, crc); |
| 90 | return 1; |
| 91 | } |
| 92 | |
| 93 | cmd->version = le16_to_cpu(cmd->version); |
| 94 | cmd->opcode = le16_to_cpu(cmd->opcode); |
| 95 | cmd->flags = le32_to_cpu(cmd->flags); |
| 96 | cmd->serial = le64_to_cpu(cmd->serial); |
| 97 | cmd->pdu_len = le32_to_cpu(cmd->pdu_len); |
| 98 | |
| 99 | switch (cmd->version) { |
| 100 | case FIO_SERVER_VER1: |
| 101 | break; |
| 102 | default: |
| 103 | log_err("fio: bad server cmd version %d\n", cmd->version); |
| 104 | return 1; |
| 105 | } |
| 106 | |
| 107 | if (cmd->pdu_len > FIO_SERVER_MAX_PDU) { |
| 108 | log_err("fio: command payload too large: %u\n", cmd->pdu_len); |
| 109 | return 1; |
| 110 | } |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | struct fio_net_cmd *fio_net_cmd_read(int sk) |
| 116 | { |
| 117 | struct fio_net_cmd cmd, *ret = NULL; |
| 118 | uint16_t crc; |
| 119 | |
| 120 | if (fio_recv_data(sk, &cmd, sizeof(cmd))) |
| 121 | return NULL; |
| 122 | |
| 123 | /* We have a command, verify it and swap if need be */ |
| 124 | if (verify_convert_cmd(&cmd)) |
| 125 | return NULL; |
| 126 | |
| 127 | /* Command checks out, alloc real command and fill in */ |
| 128 | ret = malloc(sizeof(cmd) + cmd.pdu_len); |
| 129 | memcpy(ret, &cmd, sizeof(cmd)); |
| 130 | |
| 131 | if (!ret->pdu_len) |
| 132 | return ret; |
| 133 | |
| 134 | /* There's payload, get it */ |
| 135 | if (fio_recv_data(sk, (void *) ret + sizeof(*ret), ret->pdu_len)) { |
| 136 | free(ret); |
| 137 | return NULL; |
| 138 | } |
| 139 | |
| 140 | /* Verify payload crc */ |
| 141 | crc = crc16(ret->payload, ret->pdu_len); |
| 142 | if (crc != ret->pdu_crc16) { |
| 143 | log_err("fio: server bad crc on payload (got %x, wanted %x)\n", |
| 144 | ret->pdu_crc16, crc); |
| 145 | free(ret); |
| 146 | return NULL; |
| 147 | } |
| 148 | |
| 149 | return ret; |
| 150 | } |
| 151 | |
| 152 | void fio_net_cmd_crc(struct fio_net_cmd *cmd) |
| 153 | { |
| 154 | uint32_t pdu_len; |
| 155 | |
| 156 | cmd->cmd_crc16 = cpu_to_le16(crc16(cmd, FIO_NET_CMD_CRC_SZ)); |
| 157 | |
| 158 | pdu_len = le32_to_cpu(cmd->pdu_len); |
| 159 | if (pdu_len) |
| 160 | cmd->pdu_crc16 = cpu_to_le16(crc16(cmd->payload, pdu_len)); |
| 161 | } |
| 162 | |
| 163 | int fio_net_send_cmd(int fd, uint16_t opcode, const char *buf, off_t size) |
| 164 | { |
| 165 | struct fio_net_cmd *cmd; |
| 166 | size_t this_len; |
| 167 | int ret; |
| 168 | |
| 169 | do { |
| 170 | this_len = size; |
| 171 | if (this_len > FIO_SERVER_MAX_PDU) |
| 172 | this_len = FIO_SERVER_MAX_PDU; |
| 173 | |
| 174 | cmd = malloc(sizeof(*cmd) + this_len); |
| 175 | |
| 176 | fio_init_net_cmd(cmd, opcode, buf, this_len); |
| 177 | |
| 178 | if (this_len < size) |
| 179 | cmd->flags = cpu_to_le32(FIO_NET_CMD_F_MORE); |
| 180 | |
| 181 | fio_net_cmd_crc(cmd); |
| 182 | |
| 183 | ret = fio_send_data(fd, cmd, sizeof(*cmd) + this_len); |
| 184 | free(cmd); |
| 185 | size -= this_len; |
| 186 | buf += this_len; |
| 187 | } while (!ret && size); |
| 188 | |
| 189 | return ret; |
| 190 | } |
| 191 | |
| 192 | static int send_simple_command(int sk, uint16_t opcode, uint64_t serial) |
| 193 | { |
| 194 | struct fio_net_cmd cmd = { |
| 195 | .version = cpu_to_le16(FIO_SERVER_VER1), |
| 196 | .opcode = cpu_to_le16(opcode), |
| 197 | .serial = cpu_to_le64(serial), |
| 198 | }; |
| 199 | |
| 200 | fio_net_cmd_crc(&cmd); |
| 201 | |
| 202 | return fio_send_data(sk, &cmd, sizeof(cmd)); |
| 203 | } |
| 204 | |
| 205 | /* |
| 206 | * Send an ack for this command |
| 207 | */ |
| 208 | static int ack_command(int sk, struct fio_net_cmd *cmd) |
| 209 | { |
| 210 | #if 0 |
| 211 | return send_simple_command(sk, FIO_NET_CMD_ACK, cmd->serial); |
| 212 | #else |
| 213 | return 0; |
| 214 | #endif |
| 215 | } |
| 216 | |
| 217 | #if 0 |
| 218 | static int nak_command(int sk, struct fio_net_cmd *cmd) |
| 219 | { |
| 220 | return send_simple_command(sk, FIO_NET_CMD_NAK, cmd->serial); |
| 221 | } |
| 222 | #endif |
| 223 | |
| 224 | static int send_quit_command(void) |
| 225 | { |
| 226 | dprint(FD_NET, "server: sending quit\n"); |
| 227 | return send_simple_command(server_fd, FIO_NET_CMD_QUIT, 0); |
| 228 | } |
| 229 | |
| 230 | static int handle_cur_job(struct fio_net_cmd *cmd) |
| 231 | { |
| 232 | unsigned int left = job_max_len - job_cur_len; |
| 233 | int ret = 0; |
| 234 | |
| 235 | if (left < cmd->pdu_len) { |
| 236 | job_buf = realloc(job_buf, job_max_len + 2 * cmd->pdu_len); |
| 237 | job_max_len += 2 * cmd->pdu_len; |
| 238 | } |
| 239 | |
| 240 | memcpy(job_buf + job_cur_len, cmd->payload, cmd->pdu_len); |
| 241 | job_cur_len += cmd->pdu_len; |
| 242 | |
| 243 | /* |
| 244 | * More data coming for this job |
| 245 | */ |
| 246 | if (cmd->flags & FIO_NET_CMD_F_MORE) |
| 247 | return 0; |
| 248 | |
| 249 | parse_jobs_ini(job_buf, 1, 0); |
| 250 | ret = exec_run(); |
| 251 | send_quit_command(); |
| 252 | reset_fio_state(); |
| 253 | free(job_buf); |
| 254 | job_buf = NULL; |
| 255 | job_cur_len = job_max_len = 0; |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | static int handle_command(struct fio_net_cmd *cmd) |
| 260 | { |
| 261 | int ret; |
| 262 | |
| 263 | dprint(FD_NET, "server: got opcode %d\n", cmd->opcode); |
| 264 | |
| 265 | switch (cmd->opcode) { |
| 266 | case FIO_NET_CMD_QUIT: |
| 267 | return 1; |
| 268 | case FIO_NET_CMD_EXIT: |
| 269 | exit_backend = 1; |
| 270 | return 1; |
| 271 | case FIO_NET_CMD_ACK: |
| 272 | return 0; |
| 273 | case FIO_NET_CMD_NAK: |
| 274 | return 1; |
| 275 | case FIO_NET_CMD_JOB: |
| 276 | ret = handle_cur_job(cmd); |
| 277 | break; |
| 278 | default: |
| 279 | log_err("fio: unknown opcode: %d\n", cmd->opcode); |
| 280 | ret = 1; |
| 281 | } |
| 282 | |
| 283 | return ret; |
| 284 | } |
| 285 | |
| 286 | static int handle_connection(int sk) |
| 287 | { |
| 288 | struct fio_net_cmd *cmd = NULL; |
| 289 | int ret = 0; |
| 290 | |
| 291 | /* read forever */ |
| 292 | while (!exit_backend) { |
| 293 | cmd = fio_net_cmd_read(sk); |
| 294 | if (!cmd) { |
| 295 | ret = 1; |
| 296 | break; |
| 297 | } |
| 298 | |
| 299 | ret = ack_command(sk, cmd); |
| 300 | if (ret) |
| 301 | break; |
| 302 | |
| 303 | ret = handle_command(cmd); |
| 304 | if (ret) |
| 305 | break; |
| 306 | |
| 307 | free(cmd); |
| 308 | cmd = NULL; |
| 309 | } |
| 310 | |
| 311 | if (cmd) |
| 312 | free(cmd); |
| 313 | |
| 314 | return ret; |
| 315 | } |
| 316 | |
| 317 | static int accept_loop(int listen_sk) |
| 318 | { |
| 319 | struct sockaddr addr; |
| 320 | unsigned int len = sizeof(addr); |
| 321 | struct pollfd pfd; |
| 322 | int ret, sk, flags, exitval = 0; |
| 323 | |
| 324 | flags = fcntl(listen_sk, F_GETFL); |
| 325 | flags |= O_NONBLOCK; |
| 326 | fcntl(listen_sk, F_SETFL, flags); |
| 327 | again: |
| 328 | pfd.fd = listen_sk; |
| 329 | pfd.events = POLLIN; |
| 330 | do { |
| 331 | ret = poll(&pfd, 1, 100); |
| 332 | if (ret < 0) { |
| 333 | if (errno == EINTR) |
| 334 | break; |
| 335 | log_err("fio: poll: %s\n", strerror(errno)); |
| 336 | goto out; |
| 337 | } else if (!ret) |
| 338 | continue; |
| 339 | |
| 340 | if (pfd.revents & POLLIN) |
| 341 | break; |
| 342 | } while (!exit_backend); |
| 343 | |
| 344 | if (exit_backend) |
| 345 | goto out; |
| 346 | |
| 347 | sk = accept(listen_sk, &addr, &len); |
| 348 | if (sk < 0) { |
| 349 | log_err("fio: accept: %s\n", strerror(errno)); |
| 350 | return -1; |
| 351 | } |
| 352 | |
| 353 | dprint(FD_NET, "server got a connection\n"); |
| 354 | |
| 355 | server_fd = sk; |
| 356 | |
| 357 | exitval = handle_connection(sk); |
| 358 | |
| 359 | server_fd = -1; |
| 360 | close(sk); |
| 361 | |
| 362 | if (!exit_backend) |
| 363 | goto again; |
| 364 | |
| 365 | out: |
| 366 | return exitval; |
| 367 | } |
| 368 | |
| 369 | static int fio_server(void) |
| 370 | { |
| 371 | struct sockaddr_in saddr_in; |
| 372 | struct sockaddr addr; |
| 373 | unsigned int len; |
| 374 | int sk, opt, ret; |
| 375 | |
| 376 | dprint(FD_NET, "starting server\n"); |
| 377 | |
| 378 | sk = socket(AF_INET, SOCK_STREAM, 0); |
| 379 | if (sk < 0) { |
| 380 | log_err("fio: socket: %s\n", strerror(errno)); |
| 381 | return -1; |
| 382 | } |
| 383 | |
| 384 | opt = 1; |
| 385 | if (setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) { |
| 386 | log_err("fio: setsockopt: %s\n", strerror(errno)); |
| 387 | return -1; |
| 388 | } |
| 389 | #ifdef SO_REUSEPORT |
| 390 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt)) < 0) { |
| 391 | log_err("fio: setsockopt: %s\n", strerror(errno)); |
| 392 | return 1; |
| 393 | } |
| 394 | #endif |
| 395 | |
| 396 | saddr_in.sin_family = AF_INET; |
| 397 | saddr_in.sin_addr.s_addr = htonl(INADDR_ANY); |
| 398 | saddr_in.sin_port = htons(fio_net_port); |
| 399 | |
| 400 | if (bind(sk, (struct sockaddr *) &saddr_in, sizeof(saddr_in)) < 0) { |
| 401 | log_err("fio: bind: %s\n", strerror(errno)); |
| 402 | return -1; |
| 403 | } |
| 404 | |
| 405 | if (listen(sk, 1) < 0) { |
| 406 | log_err("fio: listen: %s\n", strerror(errno)); |
| 407 | return -1; |
| 408 | } |
| 409 | |
| 410 | len = sizeof(addr); |
| 411 | if (getsockname(sk, &addr, &len) < 0) { |
| 412 | log_err("fio: getsockname: %s\n", strerror(errno)); |
| 413 | return -1; |
| 414 | } |
| 415 | |
| 416 | ret = accept_loop(sk); |
| 417 | close(sk); |
| 418 | return ret; |
| 419 | } |
| 420 | |
| 421 | int fio_server_text_output(const char *buf, unsigned int len) |
| 422 | { |
| 423 | if (server_fd != -1) |
| 424 | return fio_net_send_cmd(server_fd, FIO_NET_CMD_TEXT, buf, len); |
| 425 | |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | int fio_server_log(const char *format, ...) |
| 430 | { |
| 431 | char buffer[1024]; |
| 432 | va_list args; |
| 433 | size_t len; |
| 434 | |
| 435 | va_start(args, format); |
| 436 | len = vsnprintf(buffer, sizeof(buffer), format, args); |
| 437 | va_end(args); |
| 438 | |
| 439 | return fio_server_text_output(buffer, len); |
| 440 | } |
| 441 | |
| 442 | int fio_start_server(int daemonize) |
| 443 | { |
| 444 | pid_t pid; |
| 445 | |
| 446 | if (!daemonize) |
| 447 | return fio_server(); |
| 448 | |
| 449 | openlog("fio", LOG_NDELAY|LOG_NOWAIT|LOG_PID, LOG_USER); |
| 450 | pid = fork(); |
| 451 | if (pid < 0) { |
| 452 | syslog(LOG_ERR, "failed server fork"); |
| 453 | return 1; |
| 454 | } else if (pid) |
| 455 | exit(0); |
| 456 | |
| 457 | setsid(); |
| 458 | close(STDIN_FILENO); |
| 459 | close(STDOUT_FILENO); |
| 460 | close(STDERR_FILENO); |
| 461 | f_out = NULL; |
| 462 | f_err = NULL; |
| 463 | log_syslog = 1; |
| 464 | return fio_server(); |
| 465 | } |