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