git.sesse.net Git - jam/blob - jam.c

   1 #include <stdio.h>
   2 #include <math.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <getopt.h>
   6 #include <netdb.h>
   7 #include <unistd.h>
   8 #include <pthread.h>
   9 #include <sys/socket.h>
  10 #include <netinet/in.h>
  11
  12 unsigned short port = 2007;
  13
  14 struct in_addr *destinations = NULL;
  15 unsigned num_destinations = 0;
  16 unsigned room_destinations = 0;
  17
  18 struct in_addr *sources = NULL;
  19 unsigned num_sources = 0;
  20 unsigned room_sources = 0;
  21
  22 unsigned num_senders = 128;
  23 unsigned do_listen = 1;
  24
  25 unsigned long long total_bytes_received = 0;
  26 pthread_mutex_t receive_mutex = PTHREAD_MUTEX_INITIALIZER;
  27
  28 unsigned long long total_bytes_sent = 0;
  29 pthread_mutex_t send_mutex = PTHREAD_MUTEX_INITIALIZER;
  30
  31 const static struct option longopts[] = {
  32         { "source-list", required_argument, NULL, 's' },
  33         { "destination-list", required_argument, NULL, 'd' },
  34         { "num-senders", required_argument, NULL, 'n' },
  35         { "port", required_argument, NULL, 'p' },
  36         { "sender-only", no_argument, NULL, 'o' },
  37         { NULL, 0, NULL, 0 }
  38 };
  39
  40 // generates from [0,1>
  41 double gen_uniform_random()
  42 {
  43         return rand() / (RAND_MAX+1.0);
  44 }
  45
  46 double gen_pareto_random(double min, double k)
  47 {
  48         double u = gen_uniform_random();
  49         return min * pow(u, -1.0 / k);
  50 }
  51
  52 void read_ip_list(char *filename, struct in_addr **addr_list, unsigned *num, unsigned *room)
  53 {
  54         char buf[256];
  55         FILE *in = fopen(filename, "r");
  56         if (in == NULL) {
  57                 perror(filename);
  58                 exit(1);
  59         }
  60
  61         for ( ;; ) {
  62                 char *ptr;
  63                 struct in_addr addr;
  64                 struct hostent *he;
  65
  66                 if (fgets(buf, 256, in) == NULL)
  67                         break;
  68
  69                 ptr = strchr(buf, '\n');
  70                 if (ptr != NULL)
  71                         *ptr = 0;
  72
  73                 ptr = strchr(buf, '\r');
  74                 if (ptr != NULL)
  75                         *ptr = 0;
  76
  77                 ptr = buf + strspn(buf, " \t");
  78
  79                 if (ptr[0] == '#' || ptr[0] == 0)
  80                         continue;
  81
  82                 he = gethostbyname(ptr);
  83                 if (he == NULL) {
  84                         perror(ptr);
  85                         exit(1);
  86                 }
  87
  88                 // just pick the first for now
  89                 memcpy(&addr.s_addr, he->h_addr_list[0], sizeof(addr.s_addr));
  90
  91                 if (*num >= *room) {
  92                         if (*room == 0) {
  93                                 *room = 16;
  94                         } else {
  95                                 *room <<= 1;
  96                         }
  97                         *addr_list = (struct in_addr *)realloc(*addr_list, *room * sizeof(struct in_addr));
  98                 }
  99
 100                 (*addr_list)[*num] = addr;
 101                 ++*num;
 102         }
 103
 104         fclose(in);
 105 }
 106
 107 void parse_options(int argc, char **argv)
 108 {
 109         int option_index = 0;
 110
 111         for ( ;; ) {
 112                 int c = getopt_long(argc, argv, "s:d:n:p:o", longopts, &option_index);
 113                 switch (c) {
 114                 case 's':
 115                         read_ip_list(optarg, &sources, &num_sources, &room_sources);
 116                         break;
 117                 case 'd':
 118                         read_ip_list(optarg, &destinations, &num_destinations, &room_destinations);
 119                         break;
 120                 case 'n':
 121                         num_senders = atoi(optarg);
 122                         break;
 123                 case 'p':
 124                         port = atoi(optarg);
 125                         break;
 126                 case 'o':
 127                         do_listen = 0;
 128                         break;
 129                 case -1:
 130                         return;       // end of argument list
 131                 default:
 132                         fprintf(stderr, "Invalid option\n");
 133                         exit(1);
 134                 }
 135         }
 136 }
 137
 138 void *sender_worker(void *arg)
 139 {
 140         unsigned i;
 141         int sock;
 142         char buf[65536];
 143         unsigned long long bytes_sent = 0;
 144
 145         for (i = 0; i < 65536; ++i)
 146                 buf[i] = rand() & 0xff;
 147
 148         for (i = 0; i < 1000; ++i) {
 149                 unsigned src_num = (unsigned)(num_sources * gen_uniform_random());
 150                 unsigned dst_num = (unsigned)(num_destinations * gen_uniform_random());
 151                 unsigned num_bytes = (unsigned)gen_pareto_random(1048576.0, 1.0);
 152                 struct sockaddr_in sin;
 153
 154                 sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 155                 if (sock == -1) {
 156                         perror("socket()");
 157                         exit(1);
 158                 }
 159
 160                 // FIXME: bind to the right source
 161
 162                 sin.sin_family = AF_INET;
 163                 sin.sin_port = htons(port);
 164                 sin.sin_addr = destinations[dst_num];
 165
 166                 if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
 167                         perror("connect()");
 168                         exit(1);
 169                 }
 170
 171                 while (num_bytes > 0) {
 172                         unsigned bytes_to_send = num_bytes;
 173                         unsigned ret;
 174
 175                         if (bytes_to_send > 65536) {
 176                                 bytes_to_send = 65536;
 177                         }
 178
 179                         ret = send(sock, buf, bytes_to_send, MSG_NOSIGNAL);
 180                         if (ret == -1) {
 181                                 perror("send()");
 182                                 exit(1);
 183                         }
 184
 185                         num_bytes -= ret;
 186                         bytes_sent += ret;
 187
 188                         // update the central counter after every 1MB (8ms
 189                         // at gigabit speeds, should be enough) of sent data
 190                         if (bytes_sent > 1048576) {
 191                                 pthread_mutex_lock(&send_mutex);
 192                                 total_bytes_sent += bytes_sent;
 193                                 pthread_mutex_unlock(&send_mutex);
 194
 195                                 bytes_sent = 0;
 196                         }
 197                 }
 198
 199                 close(sock);
 200         }
 201
 202         pthread_mutex_lock(&send_mutex);
 203         total_bytes_sent += bytes_sent;
 204         pthread_mutex_unlock(&send_mutex);
 205
 206         pthread_exit(0);
 207 }
 208
 209 void *receiver_worker(void *arg)
 210 {
 211         int sock = (int)arg;
 212         char buf[65536];
 213         unsigned long long bytes_received = 0;
 214
 215         for ( ;; ) {
 216                 int ret = read(sock, buf, 65536);
 217                 if (ret == 0)
 218                         break;
 219
 220                 // update the central counter after every 1MB (8ms
 221                 // at gigabit speeds, should be enough) of received data
 222                 if (bytes_received > 1048576) {
 223                         pthread_mutex_lock(&receive_mutex);
 224                         total_bytes_sent += bytes_received;
 225                         pthread_mutex_unlock(&receive_mutex);
 226
 227                         bytes_received = 0;
 228                 }
 229         }
 230
 231         if (close(sock) == -1) {
 232                 perror("close()");
 233                 exit(1);
 234         }
 235
 236         pthread_mutex_lock(&receive_mutex);
 237         total_bytes_received += bytes_received;
 238         pthread_mutex_unlock(&receive_mutex);
 239
 240         pthread_exit(0);
 241 }
 242
 243 void *receiver_dispatcher(void *arg)
 244 {
 245         int server_sock = (int)arg;
 246         pthread_attr_t attr;
 247
 248         // FIXME: these do not really set errno
 249         if (pthread_attr_init(&attr) != 0) {
 250                 perror("pthread_attr_init()");
 251                 exit(1);
 252         }
 253
 254         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
 255                 perror("pthread_attr_setstacksize");
 256                 exit(1);
 257         }
 258
 259         if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
 260                 perror("pthread_attr_setdetachstate");
 261                 exit(1);
 262         }
 263
 264         /*
 265          * Listen for incoming connections, spawning off one receiver
 266          * thread for each (which will just gobble up the data until
 267          * we're done).
 268          */
 269         for ( ;; ) {
 270                 struct sockaddr_in addr;
 271                 socklen_t addr_len = sizeof(addr);
 272                 pthread_t thread;
 273
 274                 int sock = accept(server_sock, (struct sockaddr *)&addr, &addr_len);
 275                 if (sock == -1) {
 276                         perror("accept()");
 277                         exit(1);
 278                 }
 279
 280                 if (pthread_create(&thread, &attr, receiver_worker, (void *)sock) != 0) {
 281                         perror("pthread_create()");
 282                         exit(1);
 283                 }
 284         }
 285 }
 286
 287 int get_server_socket(unsigned short port)
 288 {
 289         int server_sock;
 290         struct sockaddr_in sin;
 291         unsigned one = 1;
 292
 293         server_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 294         if (server_sock == -1) {
 295                 perror("socket()");
 296                 exit(1);
 297         }
 298
 299         if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
 300                 perror("setsocket(SO_REUSEADDR)");
 301                 exit(1);
 302         }
 303
 304         sin.sin_family = AF_INET;
 305         sin.sin_port = htons(port);
 306         sin.sin_addr.s_addr = INADDR_ANY;
 307
 308         if (bind(server_sock, (struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1) {
 309                 perror("bind()");
 310                 exit(1);
 311         }
 312
 313         if (listen(server_sock, 255) == -1) {
 314                 perror("listen()");
 315                 exit(1);
 316         }
 317
 318         return server_sock;
 319 }
 320
 321 int main(int argc, char **argv)
 322 {
 323         int server_sock;
 324         unsigned i;
 325         pthread_attr_t attr;
 326
 327         parse_options(argc, argv);
 328
 329         if (destinations == NULL || sources == NULL) {
 330                 fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n");
 331         }
 332
 333         if (do_listen) {
 334                 server_sock = get_server_socket(port);
 335         }
 336
 337         printf("Sending data on port %u from %u sources to %u destinations.\n\n",
 338                 port, num_sources, num_destinations);
 339
 340         // FIXME: these do not really set errno
 341         if (pthread_attr_init(&attr) != 0) {
 342                 perror("pthread_attr_init()");
 343                 exit(1);
 344         }
 345
 346         if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) {
 347                 perror("pthread_attr_setstacksize");
 348                 exit(1);
 349         }
 350
 351         if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) {
 352                 perror("pthread_attr_setdetachstate");
 353                 exit(1);
 354         }
 355
 356         // Fire off the master receiver.
 357         if (do_listen) {
 358                 pthread_t thread;
 359                 if (pthread_create(&thread, &attr, receiver_dispatcher, (void *)server_sock) != 0) {
 360                         perror("pthread_create()");
 361                         exit(1);
 362                 }
 363         }
 364
 365         // Fire off sender workers.
 366         for (i = 0; i < num_senders; ++i) {
 367                 pthread_t thread;
 368
 369                 if (pthread_create(&thread, &attr, sender_worker, NULL) != 0) {
 370                         perror("pthread_create()");
 371                         exit(1);
 372                 }
 373         }
 374
 375         sleep(3600);
 376
 377         exit(0);
 378 }