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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
|
#include <asm-generic/socket.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <getopt.h>
#include "submodule/log.c-patched/src/log.h"
#include <stdint.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>
#include <signal.h>
#include <sys/epoll.h>
#include <sys/wait.h>
#include "config.h"
#define dbgchr(x) log_info("%c", x)
#define MAX_CLIENTS 10;
enum tcpf_mode {
TCPF_SERVER,
TCPF_CLIENT
};
struct poll_queue {
pthread_mutex_t lock;
uint32_t ids;
};
struct runtime_opts {
// enum tcpf_mode mode;
// uint16_t srcport;
uint16_t listenport;
char* addr;
};
struct epoll_fd_queue {
struct epoll_event *eventmode;
int i;
};
struct server_ctx {
int tcpfd;
int epoll_fd;
struct epoll_fd_queue *epoll_fd_queue;
volatile int *need_exit_ptr;
};
volatile int g_need_exit = 0;
static void review_config(struct runtime_opts *r_opts)
{
// printf("dest: %u\n", r_opts->destport);
// printf("src: %u\n", r_opts->srcport);
// printf("%s\n", (r_opts->mode == TCPF_SERVER ? "SERVER" : "CLIENT"));
printf("socks5 server listen at %u\n", r_opts->listenport);
}
static void r_opts_clean(struct runtime_opts *r_opts)
{
free(r_opts->addr);
}
static int setup_addr_storage(struct sockaddr_storage *ss_addr, struct runtime_opts *r_opts)
{
int ret = 0;
struct sockaddr_in *sockaddr_v4 = (struct sockaddr_in*)ss_addr;
memset(sockaddr_v4, 0, sizeof(*sockaddr_v4));
ret = inet_pton(AF_INET, r_opts->addr, &sockaddr_v4->sin_addr);
if (ret == 1) {
sockaddr_v4->sin_family = AF_INET;
sockaddr_v4->sin_port = htons(r_opts->listenport);
return 0;
}
return -1;
}
static int create_sock_ret_fd(struct sockaddr_storage *ss_addr)
{
socklen_t len = sizeof(struct sockaddr_in);
int ret = 0;
int fd;
fd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
if (fd < 0) {
perror("socket()");
return -1;
}
int value = 1;
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &value, sizeof(len));
ret = bind(fd, (struct sockaddr*)ss_addr, len);
if (ret < 0) {
perror("bind()");
close(fd);
return -1;
}
ret = listen(fd, 256);
if (ret < 0) {
perror("listen()");
close(fd);
return -1;
}
return fd;
}
static void signal_cb(int signum)
{
printf("signal detected, exiting...\n");
g_need_exit = 1;
}
static int server_reg_sigaction(void)
{
struct sigaction sa;
int ret;
memset(&sa, 0, sizeof(struct sigaction));
sa.sa_handler = signal_cb;
ret = sigaction(SIGINT, &sa, NULL);
if (ret < 0) {
return -1;
}
return 0;
}
static void setup_epoll(struct server_ctx *srv_ctx)
{
srv_ctx->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
}
static int enter_eventloop(struct server_ctx *srv_ctx)
{
setup_epoll(srv_ctx);
struct epoll_fd_queue *epoll_fd_queue = (struct epoll_fd_queue *)malloc(
sizeof(struct epoll_event) * MAX_ACCEPT_WORKER + sizeof(int));
srv_ctx->epoll_fd_queue = epoll_fd_queue;
for(int i = 0; i < MAX_ACCEPT_WORKER; i++) {
if (fork() == 0) {
_exit(0);
}
}
while(wait(NULL) > 0);
close(srv_ctx->epoll_fd);
free(epoll_fd_queue);
return 0;
}
static int main_server(struct runtime_opts *r_opts)
{
int ret = 0;
struct server_ctx *srv_ctx = (struct server_ctx*)malloc(sizeof(struct server_ctx));
memset(srv_ctx, 0, sizeof(struct server_ctx));
struct sockaddr_storage ss_addr;
/* link our ptr */
srv_ctx->need_exit_ptr = &g_need_exit;
review_config(r_opts);
if (setup_addr_storage(&ss_addr, r_opts) == -1) {
fprintf(stderr, "Invalid ip format\n");
}
if ((ret = create_sock_ret_fd(&ss_addr)) == -1) {
fprintf(stderr, "socket failed\n");
}
if ((ret = server_reg_sigaction()) == -1) {
fprintf(stderr, "signal handler failed\n");
}
srv_ctx->tcpfd = ret;
printf("server listening on %s:%d\n", r_opts->addr, r_opts->listenport);
if ((ret = enter_eventloop(srv_ctx) == -1)) {
fprintf(stderr, "error eventloop\n");
}
r_opts_clean(r_opts);
close(ret);
free(srv_ctx);
return 0;
}
static int parseopt(int argc, char **argv, struct runtime_opts *r_opts)
{
int optcounter = 0;
int c = 0;
static struct option opt_table[] = {
{"listen", required_argument, 0, 'l'},
{"addr", required_argument, 0, 'a'},
{0, 0, 0, 0}
};
while(1) {
c = getopt_long(argc, argv, "l:a:", opt_table, &optcounter);
if (c == -1)
break;
switch (c) {
case 'l':
r_opts->listenport = atoi(optarg);
break;
case 'a':
// strcpy(, optarg);
r_opts->addr = strdup(optarg);
break;
}
}
}
int main(int argc, char **argv)
{
short ret = 0;
struct runtime_opts runtime_opts;
parseopt(argc, argv, &runtime_opts);
// if (runtime_opts.mode == TCPF_SERVER) {
ret = main_server(&runtime_opts);
// }
return ret;
}
|
