/
nc.c
240 lines (212 loc) · 6.19 KB
/
nc.c
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/*
* network client
*
* @build: make examples
* @server bin/httpd -s restart -d
* @usage: bin/nc 127.0.0.1 8080
* > GET / HTTP/1.1
* > Connection: close
* > [Enter]
* > GET / HTTP/1.1
* > Connection: keep-alive
* > [Enter]
*/
/*
* @test udp client
* @build ./configure && make examples
* @client bin/nc -u 127.0.0.1 1234
*
*/
/*
* @test ssl client
* @build ./configure --with-openssl && make clean && make
* @client bin/nc -s 127.0.0.1 1234
*
*/
/*
* @test kcp client
* @build ./configure --with-kcp && make clean && make
* @client bin/nc -k 127.0.0.1 1234
*
*/
#include "hloop.h"
#include "hbase.h"
#include "hsocket.h"
#include "hssl.h"
#define RECV_BUFSIZE 8192
static char recvbuf[RECV_BUFSIZE];
static char protocol = 't';
static const char* protocolname = "tcp";
// for stdin
static hio_t* stdinio = NULL;
// for socket
static hio_t* sockio = NULL;
static int verbose = 0;
static void send_heartbeat(hio_t* io) {
static char buf[] = "PING\r\n";
// printf("send_heartbeat %s", buf);
hio_write(io, buf, 6);
}
static void on_recv(hio_t* io, void* buf, int readbytes) {
// printf("on_recv fd=%d readbytes=%d\n", hio_fd(io), readbytes);
if (verbose) {
char localaddrstr[SOCKADDR_STRLEN] = {0};
char peeraddrstr[SOCKADDR_STRLEN] = {0};
printf("[%s] <=> [%s]\n",
SOCKADDR_STR(hio_localaddr(io), localaddrstr),
SOCKADDR_STR(hio_peeraddr(io), peeraddrstr));
}
printf("%.*s", readbytes, (char*)buf);
// test hio_set_readbuf in hread_cb
#if 0
static int total_readbytes = 0;
total_readbytes += readbytes;
if (total_readbytes >= RECV_BUFSIZE) {
total_readbytes = 0;
}
hio_set_readbuf(io, recvbuf + total_readbytes, RECV_BUFSIZE - total_readbytes);
printf("%.*s", total_readbytes, recvbuf);
#endif
fflush(stdout);
}
static void on_stdin(hio_t* io, void* buf, int readbytes) {
// printf("on_stdin fd=%d readbytes=%d\n", hio_fd(io), readbytes);
// printf("> %s\n", buf);
char* str = (char*)buf;
// test hio_read_start/hio_read_stop/hio_close/hloop_stop
#if 1
if (strncmp(str, "start", 5) == 0) {
printf("call hio_read_start\n");
hio_read_start(sockio);
return;
}
else if (strncmp(str, "stop", 4) == 0) {
printf("call hio_read_stop\n");
hio_read_stop(sockio);
return;
}
else if (strncmp(str, "close", 5) == 0) {
printf("call hio_close\n");
hio_close(sockio);
return;
}
else if (strncmp(str, "quit", 4) == 0) {
printf("call hloop_stop\n");
hloop_stop(hevent_loop(io));
return;
}
#endif
// CR|LF => CRLF for test most protocols
char eol = str[readbytes-1];
if (eol == '\n' || eol == '\r') {
if (readbytes > 1 && str[readbytes-2] == '\r' && eol == '\n') {
// have been CRLF
}
else {
++readbytes;
str[readbytes - 2] = '\r';
str[readbytes - 1] = '\n';
}
}
hio_write(sockio, buf, readbytes);
if (strncmp(str, "CLOSE", 5) == 0) {
printf("call hio_close\n");
hio_close(sockio);
}
}
static void on_close(hio_t* io) {
// printf("on_close fd=%d error=%d\n", hio_fd(io), hio_error(io));
hio_del(stdinio, HV_READ);
}
static void on_connect(hio_t* io) {
// printf("on_connect fd=%d\n", hio_fd(io));
if (verbose) {
char localaddrstr[SOCKADDR_STRLEN] = {0};
char peeraddrstr[SOCKADDR_STRLEN] = {0};
printf("connect connfd=%d [%s] => [%s]\n", hio_fd(io),
SOCKADDR_STR(hio_localaddr(io), localaddrstr),
SOCKADDR_STR(hio_peeraddr(io), peeraddrstr));
}
hio_read_start(io);
// uncomment to test heartbeat
// hio_set_heartbeat(sockio, 3000, send_heartbeat);
}
int main(int argc, char** argv) {
if (argc < 3) {
printf("\
Usage: nc [-tusk] host port\n\
Options:\n\
-t Use tcp protocol (default)\n\
-u Use udp protocol\n\
-s Use ssl protocol\n\
-k Use kcp protocol\n\
Examples: nc 127.0.0.1 80\n\
nc -u 127.0.0.1 80\n");
return -10;
}
int index = 1;
if (argv[1][0] == '-') {
protocol = argv[1][1];
switch(protocol) {
case 't': protocolname = "tcp"; break;
case 'u': protocolname = "udp"; break;
case 's': protocolname = "ssl"; break;
case 'k': protocolname = "kcp"; break;
default: fprintf(stderr, "Unsupported protocol '%c'\n", protocol); exit(1);
}
++index;
}
const char* host = argv[index++];
int port = atoi(argv[index++]);
if (verbose) {
printf("%s %s %d\n", protocolname, host, port);
}
HV_MEMCHECK;
hloop_t* loop = hloop_new(HLOOP_FLAG_QUIT_WHEN_NO_ACTIVE_EVENTS);
// stdin use default readbuf
stdinio = hread(loop, 0, NULL, 0, on_stdin);
if (stdinio == NULL) {
return -20;
}
// socket
if (protocol == 't' || protocol == 's') {
// tcp
sockio = hloop_create_tcp_client(loop, host, port, on_connect, on_close);
if (sockio == NULL) {
return -20;
}
if (protocol == 's') {
if (strcmp(hssl_backend(), "nossl") == 0) {
fprintf(stderr, "Please recompile WITH_SSL!\n");
exit(1);
}
hio_enable_ssl(sockio);
}
}
else if (protocol == 'u' || protocol == 'k') {
// udp
sockio = hloop_create_udp_client(loop, host, port);
if (sockio == NULL) {
return -20;
}
if (protocol == 'k') {
#if WITH_KCP
static kcp_setting_t s_kcp_setting;
kcp_setting_init_with_normal_mode(&s_kcp_setting);
s_kcp_setting.conv = hv_rand(1, 999999);
hio_set_kcp(sockio, &s_kcp_setting);
#else
fprintf(stderr, "Please recompile WITH_KCP!\n");
exit(1);
#endif
}
hio_read(sockio);
}
// printf("sockfd=%d\n", hio_fd(sockio));
hio_setcb_close(sockio, on_close);
hio_setcb_read(sockio, on_recv);
hio_set_readbuf(sockio, recvbuf, RECV_BUFSIZE);
hloop_run(loop);
hloop_free(&loop);
return 0;
}