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 27 #include <sys/types.h> 28 #include <sys/endian.h> 29 #include <sys/event.h> 30 #include <sys/resource.h> 31 #include <sys/sched.h> 32 #include <sys/socket.h> 33 #include <sys/sysctl.h> 34 #include <sys/time.h> 35 #include <sys/wait.h> 36 37 #include <netinet/in.h> 38 #include <netinet/tcp.h> 39 40 #include <err.h> 41 #include <fcntl.h> 42 #include <inttypes.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #include "tcpp.h" 50 51 /* 52 * Server side -- create a pool of processes, each listening on its own TCP 53 * port number for new connections. The first 8 bytes of each connection 54 * will be a network byte order length, then there will be that number of 55 * bytes of data. We use non-blocking sockets with kqueue to avoid the 56 * overhead of threading or more than one process per processor, which makes 57 * things a bit awkward when dealing with data we care about. As such, we 58 * read into a small character buffer which we then convert to a length once 59 * we have all the data. 60 */ 61 #define CONNECTION_MAGIC 0x6392af27 62 struct connection { 63 uint32_t conn_magic; /* Just magic. */ 64 int conn_fd; 65 struct tcpp_header conn_header; /* Header buffer. */ 66 u_int conn_header_len; /* Bytes so far. */ 67 u_int64_t conn_data_len; /* How much to sink. */ 68 u_int64_t conn_data_received; /* How much so far. */ 69 }; 70 71 static pid_t *pid_list; 72 static int kq; 73 74 static struct connection * 75 tcpp_server_newconn(int listen_fd) 76 { 77 struct connection *conn; 78 struct kevent kev; 79 int fd; 80 81 fd = accept(listen_fd, NULL, NULL); 82 if (fd < 0) { 83 warn("accept"); 84 return (NULL); 85 } 86 87 if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) 88 err(-1, "fcntl"); 89 90 conn = malloc(sizeof(*conn)); 91 if (conn == NULL) 92 return (NULL); 93 bzero(conn, sizeof(*conn)); 94 conn->conn_magic = CONNECTION_MAGIC; 95 conn->conn_fd = fd; 96 97 /* 98 * Register to read on the socket, and set our conn pointer as the 99 * udata so we can find it quickly in the future. 100 */ 101 EV_SET(&kev, fd, EVFILT_READ, EV_ADD, 0, 0, conn); 102 if (kevent(kq, &kev, 1, NULL, 0, NULL) < 0) 103 err(-1, "kevent"); 104 105 return (conn); 106 } 107 108 static void 109 tcpp_server_closeconn(struct connection *conn) 110 { 111 112 /* 113 * Kqueue cleans up after itself once we close the socket, and since 114 * we are processing only one kevent at a time, we don't need to 115 * worry about watching out for future kevents referring to it. 116 * 117 * ... right? 118 */ 119 close(conn->conn_fd); 120 bzero(conn, sizeof(*conn)); 121 free(conn); 122 } 123 124 static u_char buffer[256*1024]; /* Buffer in which to sink data. */ 125 static void 126 tcpp_server_handleconn(struct kevent *kev) 127 { 128 struct connection *conn; 129 ssize_t len; 130 131 conn = kev->udata; 132 if (conn->conn_magic != CONNECTION_MAGIC) 133 errx(-1, "tcpp_server_handleconn: magic"); 134 135 if (conn->conn_header_len < sizeof(conn->conn_header)) { 136 len = read(conn->conn_fd, 137 ((u_char *)&conn->conn_header) + conn->conn_header_len, 138 sizeof(conn->conn_header) - conn->conn_header_len); 139 if (len < 0) { 140 warn("tcpp_server_handleconn: header read"); 141 tcpp_server_closeconn(conn); 142 return; 143 } 144 if (len == 0) { 145 warnx("tcpp_server_handleconn: header premature eof"); 146 tcpp_server_closeconn(conn); 147 return; 148 } 149 conn->conn_header_len += len; 150 if (conn->conn_header_len == sizeof(conn->conn_header)) { 151 tcpp_header_decode(&conn->conn_header); 152 if (conn->conn_header.th_magic != TCPP_MAGIC) { 153 warnx("tcpp_server_handleconn: bad magic"); 154 tcpp_server_closeconn(conn); 155 return; 156 } 157 } 158 } else { 159 /* 160 * Drain up to a buffer from the connection, so that we pay 161 * attention to other connections too. 162 */ 163 len = read(conn->conn_fd, buffer, sizeof(buffer)); 164 if (len < 0) { 165 warn("tcpp_server_handleconn: data bad read"); 166 tcpp_server_closeconn(conn); 167 return; 168 } 169 if (len == 0 && conn->conn_data_received < 170 conn->conn_header.th_len) { 171 warnx("tcpp_server_handleconn: data premature eof"); 172 tcpp_server_closeconn(conn); 173 return; 174 } 175 conn->conn_data_received += len; 176 if (conn->conn_data_received > conn->conn_header.th_len) { 177 warnx("tcpp_server_handleconn: too much data"); 178 tcpp_server_closeconn(conn); 179 return; 180 } 181 if (conn->conn_data_received == conn->conn_header.th_len) { 182 /* 183 * All is well. 184 */ 185 tcpp_server_closeconn(conn); 186 return; 187 } 188 } 189 } 190 191 static void 192 tcpp_server_worker(int workernum) 193 { 194 int i, listen_sock, numevents; 195 struct kevent kev, *kev_array; 196 int kev_bytes; 197 #if defined(CPU_SETSIZE) && 0 198 cpu_set_t mask; 199 int ncpus; 200 ssize_t len; 201 202 if (Pflag) { 203 len = sizeof(ncpus); 204 if (sysctlbyname(SYSCTLNAME_CPUS, &ncpus, &len, NULL, 0) < 0) 205 err(-1, "sysctlbyname: %s", SYSCTLNAME_CPUS); 206 if (len != sizeof(ncpus)) 207 errx(-1, "sysctlbyname: %s: len %jd", SYSCTLNAME_CPUS, 208 (intmax_t)len); 209 210 CPU_ZERO(&mask); 211 CPU_SET(workernum % ncpus, &mask); 212 if (sched_setaffinity(0, CPU_SETSIZE, &mask) < 0) 213 err(-1, "sched_setaffinity"); 214 } 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 #if 0 279 long cp_time_last[CPUSTATES], cp_time_now[CPUSTATES], ticks; 280 size_t size; 281 #endif 282 pid_t pid; 283 int i; 284 285 pid_list = malloc(sizeof(*pid_list) * pflag); 286 if (pid_list == NULL) 287 err(-1, "malloc pid_list"); 288 bzero(pid_list, sizeof(*pid_list) * pflag); 289 290 /* 291 * Start workers. 292 */ 293 for (i = 0; i < pflag; i++) { 294 pid = fork(); 295 if (pid < 0) { 296 warn("fork"); 297 for (i = 0; i < pflag; i++) { 298 if (pid_list[i] != 0) 299 (void)kill(pid_list[i], SIGKILL); 300 } 301 exit(-1); 302 } 303 if (pid == 0) { 304 tcpp_server_worker(i); 305 exit(0); 306 } 307 pid_list[i] = pid; 308 } 309 310 #if 0 311 size = sizeof(cp_time_last); 312 if (sysctlbyname(SYSCTLNAME_CPTIME, &cp_time_last, &size, 313 NULL, 0) < 0) 314 err(-1, "sysctlbyname: %s", SYSCTLNAME_CPTIME); 315 while (1) { 316 sleep(10); 317 size = sizeof(cp_time_last); 318 if (sysctlbyname(SYSCTLNAME_CPTIME, &cp_time_now, 319 &size, NULL, 0) < 0) 320 err(-1, "sysctlbyname: %s", 321 SYSCTLNAME_CPTIME); 322 ticks = 0; 323 for (i = 0; i < CPUSTATES; i++) { 324 cp_time_last[i] = cp_time_now[i] - 325 cp_time_last[i]; 326 ticks += cp_time_last[i]; 327 } 328 printf("user%% %lu nice%% %lu sys%% %lu intr%% %lu " 329 "idle%% %lu\n", 330 (100 * cp_time_last[CP_USER]) / ticks, 331 (100 * cp_time_last[CP_NICE]) / ticks, 332 (100 * cp_time_last[CP_SYS]) / ticks, 333 (100 * cp_time_last[CP_INTR]) / ticks, 334 (100 * cp_time_last[CP_IDLE]) / ticks); 335 bcopy(cp_time_now, cp_time_last, sizeof(cp_time_last)); 336 } 337 #endif 338 339 /* 340 * GC workers. 341 */ 342 for (i = 0; i < pflag; i++) { 343 if (pid_list[i] != 0) { 344 while (waitpid(pid_list[i], NULL, 0) != pid_list[i]); 345 } 346 } 347 } 348