1 /*- 2 * Copyright (c) 2008-2009 Robert N. M. Watson 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/types.h> 30 #include <sys/endian.h> 31 #include <sys/event.h> 32 #include <sys/resource.h> 33 #include <sys/sched.h> 34 #include <sys/socket.h> 35 #include <sys/sysctl.h> 36 #include <sys/time.h> 37 #include <sys/wait.h> 38 39 #include <netinet/in.h> 40 #include <netinet/tcp.h> 41 42 #include <err.h> 43 #include <fcntl.h> 44 #include <inttypes.h> 45 #include <signal.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include "tcpp.h" 52 53 /* 54 * Server side -- create a pool of processes, each listening on its own TCP 55 * port number for new connections. The first 8 bytes of each connection 56 * will be a network byte order length, then there will be that number of 57 * bytes of data. We use non-blocking sockets with kqueue to to avoid the 58 * overhead of threading or more than one process per processor, which makes 59 * things a bit awkward when dealing with data we care about. As such, we 60 * read into a small character buffer which we then convert to a length once 61 * we have all the data. 62 */ 63 #define CONNECTION_MAGIC 0x6392af27 64 struct connection { 65 uint32_t conn_magic; /* Just magic. */ 66 int conn_fd; 67 struct tcpp_header conn_header; /* Header buffer. */ 68 u_int conn_header_len; /* Bytes so far. */ 69 u_int64_t conn_data_len; /* How much to sink. */ 70 u_int64_t conn_data_received; /* How much so far. */ 71 }; 72 73 static pid_t *pid_list; 74 static int kq; 75 76 static struct connection * 77 tcpp_server_newconn(int listen_fd) 78 { 79 struct connection *conn; 80 struct kevent kev; 81 int fd; 82 83 fd = accept(listen_fd, NULL, NULL); 84 if (fd < 0) { 85 warn("accept"); 86 return (NULL); 87 } 88 89 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 90 err(-1, "fcntl"); 91 92 conn = malloc(sizeof(*conn)); 93 if (conn == NULL) 94 return (NULL); 95 bzero(conn, sizeof(*conn)); 96 conn->conn_magic = CONNECTION_MAGIC; 97 conn->conn_fd = fd; 98 99 /* 100 * Register to read on the socket, and set our conn pointer as the 101 * udata so we can find it quickly in the future. 102 */ 103 EV_SET(&kev, fd, EVFILT_READ, EV_ADD, 0, 0, conn); 104 if (kevent(kq, &kev, 1, NULL, 0, NULL) < 0) 105 err(-1, "kevent"); 106 107 return (conn); 108 } 109 110 static void 111 tcpp_server_closeconn(struct connection *conn) 112 { 113 114 /* 115 * Kqueue cleans up after itself once we close the socket, and since 116 * we are processing only one kevent at a time, we don't need to 117 * worry about watching out for future kevents referring to it. 118 * 119 * ... right? 120 */ 121 close(conn->conn_fd); 122 bzero(conn, sizeof(*conn)); 123 free(conn); 124 } 125 126 static u_char buffer[256*1024]; /* Buffer in which to sink data. */ 127 static void 128 tcpp_server_handleconn(struct kevent *kev) 129 { 130 struct connection *conn; 131 ssize_t len; 132 133 conn = kev->udata; 134 if (conn->conn_magic != CONNECTION_MAGIC) 135 errx(-1, "tcpp_server_handleconn: magic"); 136 137 if (conn->conn_header_len < sizeof(conn->conn_header)) { 138 len = read(conn->conn_fd, 139 ((u_char *)&conn->conn_header) + conn->conn_header_len, 140 sizeof(conn->conn_header) - conn->conn_header_len); 141 if (len < 0) { 142 warn("tcpp_server_handleconn: header read"); 143 tcpp_server_closeconn(conn); 144 return; 145 } 146 if (len == 0) { 147 warnx("tcpp_server_handleconn: header premature eof"); 148 tcpp_server_closeconn(conn); 149 return; 150 } 151 conn->conn_header_len += len; 152 if (conn->conn_header_len == sizeof(conn->conn_header)) { 153 tcpp_header_decode(&conn->conn_header); 154 if (conn->conn_header.th_magic != TCPP_MAGIC) { 155 warnx("tcpp_server_handleconn: bad magic"); 156 tcpp_server_closeconn(conn); 157 return; 158 } 159 } 160 } else { 161 /* 162 * Drain up to a buffer from the connection, so that we pay 163 * attention to other connections too. 164 */ 165 len = read(conn->conn_fd, buffer, sizeof(buffer)); 166 if (len < 0) { 167 warn("tcpp_server_handleconn: data bad read"); 168 tcpp_server_closeconn(conn); 169 return; 170 } 171 if (len == 0 && conn->conn_data_received < 172 conn->conn_header.th_len) { 173 warnx("tcpp_server_handleconn: data premature eof"); 174 tcpp_server_closeconn(conn); 175 return; 176 } 177 conn->conn_data_received += len; 178 if (conn->conn_data_received > conn->conn_header.th_len) { 179 warnx("tcpp_server_handleconn: too much data"); 180 tcpp_server_closeconn(conn); 181 return; 182 } 183 if (conn->conn_data_received == conn->conn_header.th_len) { 184 /* 185 * All is well. 186 */ 187 tcpp_server_closeconn(conn); 188 return; 189 } 190 } 191 } 192 193 static void 194 tcpp_server_worker(int workernum) 195 { 196 int i, listen_sock, numevents; 197 struct kevent kev, *kev_array; 198 int kev_bytes; 199 #if defined(CPU_SETSIZE) && 0 200 cpu_set_t mask; 201 int ncpus; 202 ssize_t len; 203 204 len = sizeof(ncpus); 205 if (sysctlbyname(SYSCTLNAME_CPUS, &ncpus, &len, NULL, 0) < 0) 206 err(-1, "sysctlbyname: %s", SYSCTLNAME_CPUS); 207 if (len != sizeof(ncpus)) 208 errx(-1, "sysctlbyname: %s: len %jd", SYSCTLNAME_CPUS, 209 (intmax_t)len); 210 211 CPU_ZERO(&mask); 212 CPU_SET(workernum % ncpus, &mask); 213 if (sched_setaffinity(0, CPU_SETSIZE, &mask) < 0) 214 err(-1, "sched_setaffinity"); 215 #endif 216 setproctitle("tcpp_server %d", workernum); 217 218 /* Allow an extra kevent for the listen socket. */ 219 kev_bytes = sizeof(*kev_array) * (mflag + 1); 220 kev_array = malloc(kev_bytes); 221 if (kev_array == NULL) 222 err(-1, "malloc"); 223 bzero(kev_array, kev_bytes); 224 225 /* XXXRW: Want to set and pin the CPU here. */ 226 227 /* 228 * Add the worker number to the local port. 229 */ 230 localipbase.sin_port = htons(rflag + workernum); 231 232 listen_sock = socket(PF_INET, SOCK_STREAM, 0); 233 if (listen_sock < 0) 234 err(-1, "socket"); 235 i = 1; 236 if (setsockopt(listen_sock, SOL_SOCKET, SO_NOSIGPIPE, &i, sizeof(i)) 237 < 0) 238 err(-1, "setsockopt"); 239 i = 1; 240 if (setsockopt(listen_sock, SOL_SOCKET, SO_REUSEPORT, &i, sizeof(i)) 241 < 0) 242 err(-1, "setsockopt"); 243 i = 1; 244 if (setsockopt(listen_sock, IPPROTO_TCP, TCP_NODELAY, &i, sizeof(i)) 245 < 0) 246 err(-1, "setsockopt"); 247 if (bind(listen_sock, (struct sockaddr *)&localipbase, 248 sizeof(localipbase)) < 0) 249 err(-1, "bind"); 250 if (listen(listen_sock, 16384)) 251 err(-1, "listen"); 252 if (fcntl(listen_sock, F_SETFL, O_NONBLOCK) < 0) 253 err(-1, "fcntl"); 254 255 kq = kqueue(); 256 if (kq < 0) 257 err(-1, "kqueue"); 258 259 EV_SET(&kev, listen_sock, EVFILT_READ, EV_ADD, 0, 0, NULL); 260 if (kevent(kq, &kev, 1, NULL, 0, NULL) < 0) 261 err(-1, "kevent"); 262 263 while ((numevents = kevent(kq, NULL, 0, kev_array, mflag + 1, NULL)) 264 > 0) { 265 for (i = 0; i < numevents; i++) { 266 if (kev_array[i].ident == (u_int)listen_sock) 267 (void)tcpp_server_newconn(listen_sock); 268 else 269 tcpp_server_handleconn(&kev_array[i]); 270 } 271 } 272 printf("Worker %d done\n", workernum); 273 } 274 275 void 276 tcpp_server(void) 277 { 278 long cp_time_last[CPUSTATES], cp_time_now[CPUSTATES], ticks; 279 size_t size; 280 pid_t pid; 281 int i; 282 283 pid_list = malloc(sizeof(*pid_list) * pflag); 284 if (pid_list == NULL) 285 err(-1, "malloc pid_list"); 286 bzero(pid_list, sizeof(*pid_list) * pflag); 287 288 /* 289 * Start workers. 290 */ 291 for (i = 0; i < pflag; i++) { 292 pid = fork(); 293 if (pid < 0) { 294 warn("fork"); 295 for (i = 0; i < pflag; i++) { 296 if (pid_list[i] != 0) 297 (void)kill(pid_list[i], SIGKILL); 298 } 299 exit(-1); 300 } 301 if (pid == 0) { 302 tcpp_server_worker(i); 303 exit(0); 304 } 305 pid_list[i] = pid; 306 } 307 308 if (Tflag) { 309 size = sizeof(cp_time_last); 310 if (sysctlbyname(SYSCTLNAME_CPTIME, &cp_time_last, &size, 311 NULL, 0) < 0) 312 err(-1, "sysctlbyname: %s", SYSCTLNAME_CPTIME); 313 while (1) { 314 sleep(10); 315 size = sizeof(cp_time_last); 316 if (sysctlbyname(SYSCTLNAME_CPTIME, &cp_time_now, 317 &size, NULL, 0) < 0) 318 err(-1, "sysctlbyname: %s", 319 SYSCTLNAME_CPTIME); 320 ticks = 0; 321 for (i = 0; i < CPUSTATES; i++) { 322 cp_time_last[i] = cp_time_now[i] - 323 cp_time_last[i]; 324 ticks += cp_time_last[i]; 325 } 326 printf("user%% %lu nice%% %lu sys%% %lu intr%% %lu " 327 "idle%% %lu\n", 328 (100 * cp_time_last[CP_USER]) / ticks, 329 (100 * cp_time_last[CP_NICE]) / ticks, 330 (100 * cp_time_last[CP_SYS]) / ticks, 331 (100 * cp_time_last[CP_INTR]) / ticks, 332 (100 * cp_time_last[CP_IDLE]) / ticks); 333 bcopy(cp_time_now, cp_time_last, sizeof(cp_time_last)); 334 } 335 } 336 337 /* 338 * GC workers. 339 */ 340 for (i = 0; i < pflag; i++) { 341 if (pid_list[i] != 0) { 342 while (waitpid(pid_list[i], NULL, 0) != pid_list[i]); 343 } 344 } 345 } 346