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1 | #include <assert.h> |
2 | #include <ctype.h> |
3 | #include <errno.h> |
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4 | #include <math.h> |
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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> |
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19 | #include <mLib/macros.h> |
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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 | |
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31 | #define sin saddrin |
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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 | |
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38 | static void IGNORABLE timers(void); |
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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); |
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81 | } |
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82 | newconn(b); |
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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++) ; |
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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); |
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102 | assert(t != t->next); |
103 | t = t->next; |
104 | } |
105 | puts(""); |
106 | } |
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107 | |
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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); |
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116 | sel_addtimer(&sel, &b->t, &tv, timeout, b); |
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117 | if (conn_init(&b->c, &sel, fd, (struct sockaddr *)&sin, sizeof(sin), |
118 | connected, b)) |
119 | goto fail; |
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120 | return; |
121 | |
122 | fail: |
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123 | sel_rmtimer(&b->t); |
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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) { |
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156 | pquis(stderr, "Usage: $ [-t TIME] [-n COUNT] HOST PORT\n"); |
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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 | } |