forked from nrfconnect/sdk-nrf
-
Notifications
You must be signed in to change notification settings - Fork 45
/
main.c
200 lines (159 loc) · 4.57 KB
/
main.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
/*
* Copyright (c) 2018 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
*/
#include <zephyr.h>
#include <net/socket.h>
#include <stdio.h>
#include <uart.h>
#include <string.h>
#define RECV_BUF_SIZE 1024
char recv_buf[RECV_BUF_SIZE];
u32_t inet_addr(u8_t a, u8_t b, u8_t c, u8_t d)
{
u32_t value = 0;
value |= (u32_t)((((u8_t)(d)) << 24) & 0xFF000000);
value |= (u32_t)((((u8_t)(c)) << 16) & 0x00FF0000);
value |= (u32_t)((((u8_t)(b)) << 8) & 0x0000FF00);
value |= (u32_t)((((u8_t)(a)) << 0) & 0x000000FF);
return value;
}
int blocking_recv(int fd, u8_t *buf, u32_t size, u32_t flags)
{
int err;
do {
err = recv(fd, buf, size, flags);
} while (err < 0 && errno == EAGAIN);
return err;
}
int blocking_send(int fd, u8_t *buf, u32_t size, u32_t flags)
{
int err;
do {
err = send(fd, buf, size, flags);
} while (err < 0 && errno == EAGAIN);
return err;
}
int blocking_connect(int fd, struct sockaddr *local_addr, socklen_t len)
{
int err;
do {
err = connect(fd, local_addr, len);
} while (err < 0 && errno == EAGAIN);
return err;
}
void app_socket_start(void)
{
struct sockaddr_in remote_addr;
struct sockaddr_in local_addr;
remote_addr.sin_family = AF_INET;
remote_addr.sin_port = htons(21);
/* ftp.uninett.no */
remote_addr.sin_addr.s_addr = inet_addr(129, 240, 118, 47);
local_addr.sin_family = AF_INET;
local_addr.sin_port = htons(0);
local_addr.sin_addr.s_addr = 0;
int client_fd = socket(AF_INET, SOCK_STREAM, 0);
if (client_fd <= 0) {
printk("client_fd: %d\r\n", client_fd);
return;
}
int err = bind(client_fd, (struct sockaddr *)&local_addr,
sizeof(local_addr));
if (err < 0) {
printk("bind err: %d\r\n", errno);
return;
}
if (blocking_connect(client_fd, (struct sockaddr *)&remote_addr,
sizeof(remote_addr)) < 0) {
printk("connect err: %d\r\n", errno);
return;
}
if (blocking_recv(client_fd, recv_buf, sizeof(recv_buf), 0) < 0) {
printk("recv err: %d\r\n", errno);
return;
}
if (blocking_send(client_fd, "USER anonymous\r\n",
strlen("USER anonymous\r\n"), 0) < 0) {
printk("send err: %d\r\n", errno);
return;
}
if (blocking_recv(client_fd, recv_buf, sizeof(recv_buf), 0) < 0) {
printk("recv err: %d\r\n", errno);
return;
}
if (blocking_send(client_fd, "PASS anonymous\r\n",
strlen("PASS anonymous\r\n"), 0) < 0) {
printk("write err: %d\r\n", errno);
return;
}
if (blocking_recv(client_fd, recv_buf, sizeof(recv_buf), 0) < 0) {
printk("recv err: %d\r\n", errno);
return;
}
if (blocking_send(client_fd, "EPSV\r\n", strlen("EPSV\r\n"), 0) < 0) {
printk("write err: %d\r\n", errno);
return;
}
if (blocking_recv(client_fd, recv_buf, sizeof(recv_buf), 0) < 0) {
printk("recv err: %d\r\n", errno);
return;
}
/* Parse port we get back, and open up a new socket with this port
* Expected string by FTP server:
* "229 Entering Extended Passive Mode (|||PORT_NUMBER|).\r\n"
*/
const char start_pattern[] = "(|||";
const char end_pattern[] = "|)";
char *start_ptr = strstr(recv_buf, start_pattern);
char *stop_ptr = strstr(recv_buf, end_pattern);
/* Calculate the length of the returned PORT to use */
int string_size =
((stop_ptr - start_ptr) - (sizeof(start_pattern) - 1));
/* five chars max + \0 at the end */
char port_num_ascii[6] = { 0 };
memcpy(port_num_ascii, start_ptr + (sizeof(start_pattern) - 1),
string_size);
/* Convert from ASCII to integer */
int port_num = atoi(port_num_ascii);
/* Create a new socket for DATA transfer */
int data_fd = socket(AF_INET, SOCK_STREAM, 0);
if (data_fd <= 0) {
printk("data_fd: %d\r\n", errno);
return;
}
/* Update the PORT given by the PASV/EPSV command */
remote_addr.sin_port = htons(port_num);
/* Connect to the PORT before issuing the DATA transfer */
err = blocking_connect(data_fd, (struct sockaddr *)&remote_addr,
sizeof(remote_addr));
if (err < 0) {
printk("connect err: %d\r\n", errno);
return;
}
char send_buf[] = "RETR robots.txt\r\n";
if (blocking_send(client_fd, send_buf, strlen(send_buf), 0) < 0) {
printk("write err: %d\r\n", errno);
return;
}
/* Clear buffer as we've reused it for previous command transfers */
memset(recv_buf, 0, sizeof(recv_buf));
/* Note: using data_fd for all data transfers! */
if (blocking_recv(data_fd, recv_buf, RECV_BUF_SIZE, 0) < 0) {
printk("recv err: %d\r\n", errno);
return;
}
/* recv_buf shall hold: "User-agent: *\nDisallow: /\n" */
printk("recv_buf:\n\r%s\n\r", recv_buf);
(void)close(client_fd);
(void)close(data_fd);
}
int main(void)
{
printk("FTP example\n\r");
app_socket_start();
while (1) {
;
}
}