X-Git-Url: https://git.sesse.net/?p=jam;a=blobdiff_plain;f=jam.c;h=1da8fc84f282189882fe5a4eddc6ff732bbd50df;hp=64c993b5333f5638a9193a412955c6fb4792f8a1;hb=7b42e7033fe932eeee2462c7bcfe2dd54889ebb5;hpb=08699598c3cd5e5da9c795c09f47f0a50d889e29 diff --git a/jam.c b/jam.c index 64c993b..1da8fc8 100644 --- a/jam.c +++ b/jam.c @@ -1,17 +1,199 @@ #include +#include +#include #include +#include +#include #include #include #include #include +unsigned short port = 2007; + +struct in_addr *destinations = NULL; +unsigned num_destinations = 0; +unsigned room_destinations = 0; + +struct in_addr *sources = NULL; +unsigned num_sources = 0; +unsigned room_sources = 0; + +unsigned num_senders = 128; +unsigned do_listen = 1; + +const static struct option longopts[] = { + { "source-list", required_argument, NULL, 's' }, + { "destination-list", required_argument, NULL, 'd' }, + { "num-senders", required_argument, NULL, 'n' }, + { "port", required_argument, NULL, 'p' }, + { "sender-only", no_argument, NULL, 'o' }, + { NULL, 0, NULL, 0 } +}; + +// generates from [0,1> +double gen_uniform_random() +{ + return rand() / (RAND_MAX+1.0); +} + +double gen_pareto_random(double min, double k) +{ + double u = gen_uniform_random(); + return min * pow(u, -1.0 / k); +} + +void read_ip_list(char *filename, struct in_addr **addr_list, unsigned *num, unsigned *room) +{ + char buf[256]; + FILE *in = fopen(filename, "r"); + if (in == NULL) { + perror(filename); + exit(1); + } + + for ( ;; ) { + char *ptr; + struct in_addr addr; + struct hostent *he; + + if (fgets(buf, 256, in) == NULL) + break; + + ptr = strchr(buf, '\n'); + if (ptr != NULL) + *ptr = 0; + + ptr = strchr(buf, '\r'); + if (ptr != NULL) + *ptr = 0; + + ptr = buf + strspn(buf, " \t"); + + if (ptr[0] == '#' || ptr[0] == 0) + continue; + + he = gethostbyname(ptr); + if (he == NULL) { + perror(ptr); + exit(1); + } + + // just pick the first for now + memcpy(&addr.s_addr, he->h_addr_list[0], sizeof(addr.s_addr)); + + if (*num >= *room) { + if (*room == 0) { + *room = 16; + } else { + *room <<= 1; + } + *addr_list = (struct in_addr *)realloc(*addr_list, *room * sizeof(struct in_addr)); + } + + (*addr_list)[*num] = addr; + ++*num; + } + + fclose(in); +} + +void parse_options(int argc, char **argv) +{ + int option_index = 0; + + for ( ;; ) { + int c = getopt_long(argc, argv, "s:d:n:p:o", longopts, &option_index); + switch (c) { + case 's': + read_ip_list(optarg, &sources, &num_sources, &room_sources); + break; + case 'd': + read_ip_list(optarg, &destinations, &num_destinations, &room_destinations); + break; + case 'n': + num_senders = atoi(optarg); + break; + case 'p': + port = atoi(optarg); + break; + case 'o': + do_listen = 0; + break; + case -1: + return; // end of argument list + default: + fprintf(stderr, "Invalid option\n"); + exit(1); + } + } +} + +void *sender_worker(void *arg) +{ + unsigned i; + int sock; + char buf[65536]; + + for (i = 0; i < 65536; ++i) + buf[i] = rand() & 0xff; + + for (i = 0; i < 1000; ++i) { + unsigned src_num = (unsigned)(num_sources * gen_uniform_random()); + unsigned dst_num = (unsigned)(num_destinations * gen_uniform_random()); + unsigned num_bytes = (unsigned)gen_pareto_random(1048576.0, 1.0); + struct sockaddr_in sin; + + sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); + if (sock == -1) { + perror("socket()"); + exit(1); + } + + // FIXME: bind to the right source + + sin.sin_family = AF_INET; + sin.sin_port = htons(port); + sin.sin_addr = destinations[dst_num]; + + fprintf(stderr, "connecting %u\n", i); + + if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) == -1) { + perror("connect()"); + exit(1); + } + + fprintf(stderr, "connected\n"); + + while (num_bytes > 0) { + unsigned bytes_to_send = num_bytes; + unsigned ret; + + if (bytes_to_send > 65536) { + bytes_to_send = 65536; + } + + ret = send(sock, buf, bytes_to_send, MSG_NOSIGNAL); + if (ret == -1) { + perror("send()"); + exit(1); + } + + num_bytes -= ret; + } + fprintf(stderr, "sent\n"); + + close(sock); + } + + pthread_exit(0); +} + void *receiver_worker(void *arg) { int sock = (int)arg; char buf[65536]; - printf("Received worker for socket %u\n", sock); - for ( ;; ) { int ret = read(sock, buf, 65536); if (ret == 0) @@ -19,8 +201,6 @@ void *receiver_worker(void *arg) // FIXME: update stats here } - - printf("Socket %u done\n", sock); if (close(sock) == -1) { perror("close()"); @@ -34,6 +214,7 @@ int get_server_socket(unsigned short port) { int server_sock; struct sockaddr_in sin; + unsigned one = 1; server_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); if (server_sock == -1) { @@ -41,6 +222,11 @@ int get_server_socket(unsigned short port) exit(1); } + if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) { + perror("setsocket(SO_REUSEADDR)"); + exit(1); + } + sin.sin_family = AF_INET; sin.sin_port = htons(port); sin.sin_addr.s_addr = INADDR_ANY; @@ -58,17 +244,61 @@ int get_server_socket(unsigned short port) return server_sock; } -int main() +int main(int argc, char **argv) { - int server_sock = get_server_socket(2007); + int server_sock; + unsigned i; + pthread_attr_t attr; + + parse_options(argc, argv); + + if (destinations == NULL || sources == NULL) { + fprintf(stderr, "Missing or empty source or destination host list. Aborting.\n"); + } + + if (do_listen) { + server_sock = get_server_socket(port); + } + + printf("Sending data on port %u from %u sources to %u destinations.\n\n", + port, num_sources, num_destinations); + + // FIXME: these do not really set errno + if (pthread_attr_init(&attr) != 0) { + perror("pthread_attr_init()"); + exit(1); + } - // FIXME: fire off sender workers here + if (pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN + 65536 + 0x4000) != 0) { + perror("pthread_attr_setstacksize"); + exit(1); + } + + if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0) { + perror("pthread_attr_setdetachstate"); + exit(1); + } + + // Fire off sender workers. + for (i = 0; i < num_senders; ++i) { + pthread_t thread; + + if (pthread_create(&thread, &attr, sender_worker, NULL) != 0) { + perror("pthread_create()"); + exit(1); + } + } /* * Listen for incoming connections, spawning off one receiver * thread for each (which will just gobble up the data until * we're done). */ + if (!do_listen) { + sleep(3600); + exit(0); + } + for ( ;; ) { struct sockaddr_in addr; socklen_t addr_len = sizeof(addr); @@ -80,7 +310,7 @@ int main() exit(1); } - if (pthread_create(&thread, NULL, receiver_worker, (void *)sock) == -1) { + if (pthread_create(&thread, &attr, receiver_worker, (void *)sock) != 0) { perror("pthread_create()"); exit(1); }