| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdarg.h> |
| #include <unistd.h> |
| #include <limits.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sys/poll.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <sys/mman.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <netdb.h> |
| #include <syslog.h> |
| |
| #include "fio.h" |
| #include "server.h" |
| #include "crc/crc16.h" |
| |
| int fio_net_port = 8765; |
| |
| int exit_backend = 0; |
| |
| static char *job_buf; |
| static unsigned int job_cur_len; |
| static unsigned int job_max_len; |
| |
| static int server_fd = -1; |
| |
| int fio_send_data(int sk, const void *p, unsigned int len) |
| { |
| assert(len <= sizeof(struct fio_net_cmd) + FIO_SERVER_MAX_PDU); |
| |
| do { |
| int ret = send(sk, p, len, 0); |
| |
| if (ret > 0) { |
| len -= ret; |
| if (!len) |
| break; |
| p += ret; |
| continue; |
| } else if (!ret) |
| break; |
| else if (errno == EAGAIN || errno == EINTR) |
| continue; |
| } while (!exit_backend); |
| |
| if (!len) |
| return 0; |
| |
| return 1; |
| } |
| |
| int fio_recv_data(int sk, void *p, unsigned int len) |
| { |
| do { |
| int ret = recv(sk, p, len, MSG_WAITALL); |
| |
| if (ret > 0) { |
| len -= ret; |
| if (!len) |
| break; |
| p += ret; |
| continue; |
| } else if (!ret) |
| break; |
| else if (errno == EAGAIN || errno == EINTR) |
| continue; |
| } while (!exit_backend); |
| |
| if (!len) |
| return 0; |
| |
| return -1; |
| } |
| |
| static int verify_convert_cmd(struct fio_net_cmd *cmd) |
| { |
| uint16_t crc; |
| |
| cmd->cmd_crc16 = le16_to_cpu(cmd->cmd_crc16); |
| cmd->pdu_crc16 = le16_to_cpu(cmd->pdu_crc16); |
| |
| crc = crc16(cmd, FIO_NET_CMD_CRC_SZ); |
| if (crc != cmd->cmd_crc16) { |
| log_err("fio: server bad crc on command (got %x, wanted %x)\n", |
| cmd->cmd_crc16, crc); |
| return 1; |
| } |
| |
| cmd->version = le16_to_cpu(cmd->version); |
| cmd->opcode = le16_to_cpu(cmd->opcode); |
| cmd->flags = le32_to_cpu(cmd->flags); |
| cmd->serial = le64_to_cpu(cmd->serial); |
| cmd->pdu_len = le32_to_cpu(cmd->pdu_len); |
| |
| switch (cmd->version) { |
| case FIO_SERVER_VER1: |
| break; |
| default: |
| log_err("fio: bad server cmd version %d\n", cmd->version); |
| return 1; |
| } |
| |
| if (cmd->pdu_len > FIO_SERVER_MAX_PDU) { |
| log_err("fio: command payload too large: %u\n", cmd->pdu_len); |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| struct fio_net_cmd *fio_net_cmd_read(int sk) |
| { |
| struct fio_net_cmd cmd, *ret = NULL; |
| uint16_t crc; |
| |
| if (fio_recv_data(sk, &cmd, sizeof(cmd))) |
| return NULL; |
| |
| /* We have a command, verify it and swap if need be */ |
| if (verify_convert_cmd(&cmd)) |
| return NULL; |
| |
| /* Command checks out, alloc real command and fill in */ |
| ret = malloc(sizeof(cmd) + cmd.pdu_len); |
| memcpy(ret, &cmd, sizeof(cmd)); |
| |
| if (!ret->pdu_len) |
| return ret; |
| |
| /* There's payload, get it */ |
| if (fio_recv_data(sk, (void *) ret + sizeof(*ret), ret->pdu_len)) { |
| free(ret); |
| return NULL; |
| } |
| |
| /* Verify payload crc */ |
| crc = crc16(ret->payload, ret->pdu_len); |
| if (crc != ret->pdu_crc16) { |
| log_err("fio: server bad crc on payload (got %x, wanted %x)\n", |
| ret->pdu_crc16, crc); |
| free(ret); |
| return NULL; |
| } |
| |
| return ret; |
| } |
| |
| void fio_net_cmd_crc(struct fio_net_cmd *cmd) |
| { |
| uint32_t pdu_len; |
| |
| cmd->cmd_crc16 = cpu_to_le16(crc16(cmd, FIO_NET_CMD_CRC_SZ)); |
| |
| pdu_len = le32_to_cpu(cmd->pdu_len); |
| if (pdu_len) |
| cmd->pdu_crc16 = cpu_to_le16(crc16(cmd->payload, pdu_len)); |
| } |
| |
| int fio_net_send_cmd(int fd, uint16_t opcode, const char *buf, off_t size) |
| { |
| struct fio_net_cmd *cmd; |
| size_t this_len; |
| int ret; |
| |
| do { |
| this_len = size; |
| if (this_len > FIO_SERVER_MAX_PDU) |
| this_len = FIO_SERVER_MAX_PDU; |
| |
| cmd = malloc(sizeof(*cmd) + this_len); |
| |
| fio_init_net_cmd(cmd, opcode, buf, this_len); |
| |
| if (this_len < size) |
| cmd->flags = cpu_to_le32(FIO_NET_CMD_F_MORE); |
| |
| fio_net_cmd_crc(cmd); |
| |
| ret = fio_send_data(fd, cmd, sizeof(*cmd) + this_len); |
| free(cmd); |
| size -= this_len; |
| buf += this_len; |
| } while (!ret && size); |
| |
| return ret; |
| } |
| |
| static int send_simple_command(int sk, uint16_t opcode, uint64_t serial) |
| { |
| struct fio_net_cmd cmd = { |
| .version = cpu_to_le16(FIO_SERVER_VER1), |
| .opcode = cpu_to_le16(opcode), |
| .serial = cpu_to_le64(serial), |
| }; |
| |
| fio_net_cmd_crc(&cmd); |
| |
| return fio_send_data(sk, &cmd, sizeof(cmd)); |
| } |
| |
| /* |
| * Send an ack for this command |
| */ |
| static int ack_command(int sk, struct fio_net_cmd *cmd) |
| { |
| #if 0 |
| return send_simple_command(sk, FIO_NET_CMD_ACK, cmd->serial); |
| #else |
| return 0; |
| #endif |
| } |
| |
| #if 0 |
| static int nak_command(int sk, struct fio_net_cmd *cmd) |
| { |
| return send_simple_command(sk, FIO_NET_CMD_NAK, cmd->serial); |
| } |
| #endif |
| |
| static int send_quit_command(void) |
| { |
| dprint(FD_NET, "server: sending quit\n"); |
| return send_simple_command(server_fd, FIO_NET_CMD_QUIT, 0); |
| } |
| |
| static int handle_cur_job(struct fio_net_cmd *cmd) |
| { |
| unsigned int left = job_max_len - job_cur_len; |
| int ret = 0; |
| |
| if (left < cmd->pdu_len) { |
| job_buf = realloc(job_buf, job_max_len + 2 * cmd->pdu_len); |
| job_max_len += 2 * cmd->pdu_len; |
| } |
| |
| memcpy(job_buf + job_cur_len, cmd->payload, cmd->pdu_len); |
| job_cur_len += cmd->pdu_len; |
| |
| /* |
| * More data coming for this job |
| */ |
| if (cmd->flags & FIO_NET_CMD_F_MORE) |
| return 0; |
| |
| parse_jobs_ini(job_buf, 1, 0); |
| ret = exec_run(); |
| send_quit_command(); |
| reset_fio_state(); |
| free(job_buf); |
| job_buf = NULL; |
| job_cur_len = job_max_len = 0; |
| return ret; |
| } |
| |
| static int handle_command(struct fio_net_cmd *cmd) |
| { |
| int ret; |
| |
| dprint(FD_NET, "server: got opcode %d\n", cmd->opcode); |
| |
| switch (cmd->opcode) { |
| case FIO_NET_CMD_QUIT: |
| return 1; |
| case FIO_NET_CMD_EXIT: |
| exit_backend = 1; |
| return 1; |
| case FIO_NET_CMD_ACK: |
| return 0; |
| case FIO_NET_CMD_NAK: |
| return 1; |
| case FIO_NET_CMD_JOB: |
| ret = handle_cur_job(cmd); |
| break; |
| default: |
| log_err("fio: unknown opcode: %d\n", cmd->opcode); |
| ret = 1; |
| } |
| |
| return ret; |
| } |
| |
| static int handle_connection(int sk) |
| { |
| struct fio_net_cmd *cmd = NULL; |
| int ret = 0; |
| |
| /* read forever */ |
| while (!exit_backend) { |
| cmd = fio_net_cmd_read(sk); |
| if (!cmd) { |
| ret = 1; |
| break; |
| } |
| |
| ret = ack_command(sk, cmd); |
| if (ret) |
| break; |
| |
| ret = handle_command(cmd); |
| if (ret) |
| break; |
| |
| free(cmd); |
| cmd = NULL; |
| } |
| |
| if (cmd) |
| free(cmd); |
| |
| return ret; |
| } |
| |
| static int accept_loop(int listen_sk) |
| { |
| struct sockaddr addr; |
| unsigned int len = sizeof(addr); |
| struct pollfd pfd; |
| int ret, sk, flags, exitval = 0; |
| |
| flags = fcntl(listen_sk, F_GETFL); |
| flags |= O_NONBLOCK; |
| fcntl(listen_sk, F_SETFL, flags); |
| again: |
| pfd.fd = listen_sk; |
| pfd.events = POLLIN; |
| do { |
| ret = poll(&pfd, 1, 100); |
| if (ret < 0) { |
| if (errno == EINTR) |
| break; |
| log_err("fio: poll: %s\n", strerror(errno)); |
| goto out; |
| } else if (!ret) |
| continue; |
| |
| if (pfd.revents & POLLIN) |
| break; |
| } while (!exit_backend); |
| |
| if (exit_backend) |
| goto out; |
| |
| sk = accept(listen_sk, &addr, &len); |
| if (sk < 0) { |
| log_err("fio: accept: %s\n", strerror(errno)); |
| return -1; |
| } |
| |
| dprint(FD_NET, "server got a connection\n"); |
| |
| server_fd = sk; |
| |
| exitval = handle_connection(sk); |
| |
| server_fd = -1; |
| close(sk); |
| |
| if (!exit_backend) |
| goto again; |
| |
| out: |
| return exitval; |
| } |
| |
| static int fio_server(void) |
| { |
| struct sockaddr_in saddr_in; |
| struct sockaddr addr; |
| unsigned int len; |
| int sk, opt, ret; |
| |
| dprint(FD_NET, "starting server\n"); |
| |
| sk = socket(AF_INET, SOCK_STREAM, 0); |
| if (sk < 0) { |
| log_err("fio: socket: %s\n", strerror(errno)); |
| return -1; |
| } |
| |
| opt = 1; |
| if (setsockopt(sk, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) { |
| log_err("fio: setsockopt: %s\n", strerror(errno)); |
| return -1; |
| } |
| #ifdef SO_REUSEPORT |
| if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &opt, sizeof(opt)) < 0) { |
| log_err("fio: setsockopt: %s\n", strerror(errno)); |
| return 1; |
| } |
| #endif |
| |
| saddr_in.sin_family = AF_INET; |
| saddr_in.sin_addr.s_addr = htonl(INADDR_ANY); |
| saddr_in.sin_port = htons(fio_net_port); |
| |
| if (bind(sk, (struct sockaddr *) &saddr_in, sizeof(saddr_in)) < 0) { |
| log_err("fio: bind: %s\n", strerror(errno)); |
| return -1; |
| } |
| |
| if (listen(sk, 1) < 0) { |
| log_err("fio: listen: %s\n", strerror(errno)); |
| return -1; |
| } |
| |
| len = sizeof(addr); |
| if (getsockname(sk, &addr, &len) < 0) { |
| log_err("fio: getsockname: %s\n", strerror(errno)); |
| return -1; |
| } |
| |
| ret = accept_loop(sk); |
| close(sk); |
| return ret; |
| } |
| |
| int fio_server_text_output(const char *buf, unsigned int len) |
| { |
| if (server_fd != -1) |
| return fio_net_send_cmd(server_fd, FIO_NET_CMD_TEXT, buf, len); |
| |
| return 0; |
| } |
| |
| int fio_server_log(const char *format, ...) |
| { |
| char buffer[1024]; |
| va_list args; |
| size_t len; |
| |
| va_start(args, format); |
| len = vsnprintf(buffer, sizeof(buffer), format, args); |
| va_end(args); |
| |
| return fio_server_text_output(buffer, len); |
| } |
| |
| int fio_start_server(int daemonize) |
| { |
| pid_t pid; |
| |
| if (!daemonize) |
| return fio_server(); |
| |
| openlog("fio", LOG_NDELAY|LOG_NOWAIT|LOG_PID, LOG_USER); |
| pid = fork(); |
| if (pid < 0) { |
| syslog(LOG_ERR, "failed server fork"); |
| return 1; |
| } else if (pid) |
| exit(0); |
| |
| setsid(); |
| close(STDIN_FILENO); |
| close(STDOUT_FILENO); |
| close(STDERR_FILENO); |
| f_out = NULL; |
| f_err = NULL; |
| log_syslog = 1; |
| return fio_server(); |
| } |