| 1 | #include <assert.h> |
| 2 | #include <ctype.h> |
| 3 | #include <errno.h> |
| 4 | #include <math.h> |
| 5 | #include <stdio.h> |
| 6 | #include <stdlib.h> |
| 7 | #include <string.h> |
| 8 | |
| 9 | #include <sys/types.h> |
| 10 | #include <sys/time.h> |
| 11 | #include <unistd.h> |
| 12 | #include <sys/socket.h> |
| 13 | #include <netinet/in.h> |
| 14 | #include <arpa/inet.h> |
| 15 | #include <netdb.h> |
| 16 | |
| 17 | #include <mLib/alloc.h> |
| 18 | #include <mLib/conn.h> |
| 19 | #include <mLib/macros.h> |
| 20 | #include <mLib/mdwopt.h> |
| 21 | #include <mLib/quis.h> |
| 22 | #include <mLib/report.h> |
| 23 | #include <mLib/sel.h> |
| 24 | #include <mLib/tv.h> |
| 25 | |
| 26 | typedef struct blast { |
| 27 | conn c; |
| 28 | sel_timer t; |
| 29 | } blast; |
| 30 | |
| 31 | #define sin saddrin |
| 32 | static struct sockaddr_in sin; |
| 33 | static sel_state sel; |
| 34 | static struct timeval ctv = { 0, 500000 }; |
| 35 | static sel_timer sec; |
| 36 | static unsigned count = 0; |
| 37 | |
| 38 | static void IGNORABLE timers(void); |
| 39 | |
| 40 | static void stats(struct timeval *tv, void *p) |
| 41 | { |
| 42 | static char baton[5] = "/-\\|"; |
| 43 | static char *bt = baton; |
| 44 | struct timeval ttv; |
| 45 | printf("\r%c %u connections/second", *bt++, count); |
| 46 | if (!*bt) |
| 47 | bt = baton; |
| 48 | fflush(stdout); |
| 49 | count = 0; |
| 50 | TV_ADDL(&ttv, tv, 1, 0); |
| 51 | sel_addtimer(&sel, &sec, &ttv, stats, p); |
| 52 | } |
| 53 | |
| 54 | static void newconn(blast *b); |
| 55 | |
| 56 | static void retry(struct timeval *tv, void *p) |
| 57 | { |
| 58 | blast *b = p; |
| 59 | newconn(b); |
| 60 | } |
| 61 | |
| 62 | static void backoff(blast *b) |
| 63 | { |
| 64 | struct timeval tv; |
| 65 | unsigned r = rand(); |
| 66 | double q = RAND_MAX / 5; |
| 67 | gettimeofday(&tv, 0); |
| 68 | TV_ADDL(&tv, &tv, r / q, (r % (unsigned)q) * (MILLION / q)); |
| 69 | sel_addtimer(&sel, &b->t, &tv, retry, b); |
| 70 | } |
| 71 | |
| 72 | static void connected(int fd, void *p) |
| 73 | { |
| 74 | blast *b = p; |
| 75 | sel_rmtimer(&b->t); |
| 76 | if (fd == -1) |
| 77 | backoff(b); |
| 78 | else { |
| 79 | count++; |
| 80 | close(fd); |
| 81 | } |
| 82 | newconn(b); |
| 83 | } |
| 84 | |
| 85 | static void timeout(struct timeval *tv, void *p) |
| 86 | { |
| 87 | blast *b = p; |
| 88 | conn_kill(&b->c); |
| 89 | newconn(b); |
| 90 | } |
| 91 | |
| 92 | static void timers(void) |
| 93 | { |
| 94 | struct tab { void (*func)(struct timeval *tv, void *p); const char *name; } |
| 95 | tab[] = { { retry, "retry" }, {timeout, "timeout"}, { stats, "stats" }, { 0, |
| 96 | 0 }}; |
| 97 | sel_timer *t = sel.timers; |
| 98 | while (t) { |
| 99 | struct tab *q; for (q = tab; q->func != t->func; q++) ; |
| 100 | /* assert(t->prev->next == t); */ |
| 101 | printf("%lu.%06lu %p %s\n", t->tv.tv_sec, t->tv.tv_usec, t->p, q->name); |
| 102 | assert(t != t->next); |
| 103 | t = t->next; |
| 104 | } |
| 105 | puts(""); |
| 106 | } |
| 107 | |
| 108 | static void newconn(blast *b) |
| 109 | { |
| 110 | int fd = socket(PF_INET, SOCK_STREAM, 0); |
| 111 | struct timeval tv; |
| 112 | if (fd < 0) |
| 113 | goto fail; |
| 114 | gettimeofday(&tv, 0); |
| 115 | TV_ADD(&tv, &tv, &ctv); |
| 116 | sel_addtimer(&sel, &b->t, &tv, timeout, b); |
| 117 | if (conn_init(&b->c, &sel, fd, (struct sockaddr *)&sin, sizeof(sin), |
| 118 | connected, b)) |
| 119 | goto fail; |
| 120 | return; |
| 121 | |
| 122 | fail: |
| 123 | sel_rmtimer(&b->t); |
| 124 | backoff(b); |
| 125 | } |
| 126 | |
| 127 | int main(int argc, char *argv[]) |
| 128 | { |
| 129 | blast *b; |
| 130 | size_t n = 256; |
| 131 | |
| 132 | ego(argv[0]); |
| 133 | |
| 134 | for (;;) { |
| 135 | int i = getopt(argc, argv, "t:n:"); |
| 136 | if (i < 0) |
| 137 | break; |
| 138 | switch (i) { |
| 139 | case 't': { |
| 140 | double t = strtod(optarg, 0); |
| 141 | double s = modf(t, &t); |
| 142 | ctv.tv_sec = t; |
| 143 | ctv.tv_usec = s * MILLION; |
| 144 | } break; |
| 145 | case 'n': |
| 146 | n = atoi(optarg); |
| 147 | break; |
| 148 | default: |
| 149 | exit(1); |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | argv += optind; |
| 154 | argc -= optind; |
| 155 | if (argc != 2) { |
| 156 | pquis(stderr, "Usage: $ [-t TIME] [-n COUNT] HOST PORT\n"); |
| 157 | exit(1); |
| 158 | } |
| 159 | |
| 160 | sel_init(&sel); |
| 161 | sin.sin_family = AF_INET; |
| 162 | |
| 163 | { |
| 164 | struct hostent *h = gethostbyname(argv[0]); |
| 165 | if (!h) |
| 166 | die(1, "bad hostname `%s'", argv[0]); |
| 167 | memcpy(&sin.sin_addr, h->h_addr, sizeof(struct in_addr)); |
| 168 | } |
| 169 | |
| 170 | if (isdigit((unsigned char)argv[1][0])) |
| 171 | sin.sin_port = htons(atoi(argv[1])); |
| 172 | else { |
| 173 | struct servent *s = getservbyname(argv[1], "tcp"); |
| 174 | if (!s) |
| 175 | die(1, "bad service name `%s'", argv[1]); |
| 176 | sin.sin_port = s->s_port; |
| 177 | } |
| 178 | |
| 179 | b = xmalloc(n * sizeof(blast)); |
| 180 | |
| 181 | { |
| 182 | int i; |
| 183 | for (i = 0; i < n; i++) |
| 184 | newconn(&b[i]); |
| 185 | } |
| 186 | |
| 187 | { |
| 188 | struct timeval tv; |
| 189 | gettimeofday(&tv, 0); |
| 190 | tv.tv_sec++; |
| 191 | sel_addtimer(&sel, &sec, &tv, stats, 0); |
| 192 | } |
| 193 | |
| 194 | for (;;) { |
| 195 | sel_select(&sel); |
| 196 | } |
| 197 | } |