1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/* $OpenBSD: server-tcp.c,v 1.4 2021/07/06 11:50:34 bluhm Exp $ */
/*
* Copyright (c) 2020 Alexander Bluhm <bluhm@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
void __dead usage(void);
int listen_socket(const char *, const char *);
int accept_socket(int);
void __dead
usage(void)
{
fprintf(stderr, "server-tcp [-r rcvmsg] [-s sndmsg] host port\n"
" -E wait for EOF\n"
" -N shutdown write\n"
" -r rcvmsg receive from client and check message\n"
" -s sndmsg send message to client\n");
exit(2);
}
int
main(int argc, char *argv[])
{
const char *host, *port;
struct task todo[100];
size_t tlen = 0;
int ch, s;
while ((ch = getopt(argc, argv, "ENr:s:")) != -1) {
switch (ch) {
case 'E':
case 'N':
case 'r':
case 's':
if (tlen >= sizeof(todo) / sizeof(todo[0]))
errx(1, "too many tasks");
task_enqueue(&todo[tlen], ch, optarg);
tlen++;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc == 2) {
host = argv[0];
port = argv[1];
} else {
usage();
}
alarm(10);
s = listen_socket(host, port);
print_sockname(s);
switch (fork()) {
case -1:
err(1, "fork");
case 0:
/* child continues, set timer for new process */
alarm(10);
break;
default:
/* parent exits and test runs in parallel */
_exit(0);
}
s = accept_socket(s);
task_run(s, todo, tlen);
if (close(s) == -1)
err(1, "close");
return 0;
}
int
listen_socket(const char *host, const char *port)
{
struct addrinfo hints, *res, *res0;
int error;
int save_errno;
int s;
const char *cause = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(host, port, &hints, &res0);
if (error)
errx(1, "%s", gai_strerror(error));
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s == -1) {
cause = "socket";
continue;
}
if (bind(s, res->ai_addr, res->ai_addrlen) == -1) {
cause = "bind";
save_errno = errno;
close(s);
s = -1;
errno = save_errno;
continue;
}
break; /* okay we got one */
}
if (s == -1)
err(1, "%s", cause);
freeaddrinfo(res0);
if (listen(s, 5) == -1)
err(1, "listen");
return s;
}
int
accept_socket(int s)
{
struct sockaddr_storage ss;
socklen_t slen;
char host[NI_MAXHOST], port[NI_MAXSERV];
slen = sizeof(ss);
s = accept(s, (struct sockaddr *)&ss, &slen);
if (s == -1)
err(1, "accept");
if (getnameinfo((struct sockaddr *)&ss, ss.ss_len, host, sizeof(host),
port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV))
errx(1, "getnameinfo");
fprintf(stderr, "peer: %s %s\n", host, port);
return s;
}
|
