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
| #include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#define BUFFER_SIZE 1024
static const char* status_line[2] = { "200 OK", "500 Internal server error" };
int main(int argc, char* argv[])
{
if (argc <= 3)
{
printf("usage: %s ip_address port_number filename\n", basename(argv[0]));
return 1;
}
const char* ip = argv[1];
int port = atoi(argv[2]);
const char* file_name = "/opt/test.txt";
struct sockaddr_in address = {0};
address.sin_family = AF_INET;
inet_pton(AF_INET, ip, &address.sin_addr);
address.sin_port = htons(port);
int sock = socket(PF_INET, SOCK_STREAM, 0);
assert(sock >= 0);
int ret = bind(sock, (struct sockaddr*)&address, sizeof(address));
assert(ret != -1);
ret = listen(sock, 5);
assert(ret != -1);
struct sockaddr_in client;
socklen_t client_addrlength = sizeof(client);
int connfd = accept(sock, (struct sockaddr*)&client, &client_addrlength);
if (connfd < 0)
{
printf("errno is: %d\n", errno);
}
else
{
char header_buf[BUFFER_SIZE];
memset(header_buf, '\0', BUFFER_SIZE);
char* file_buf;
struct stat file_stat;
bool valid = true;
int len = 0;
if (stat(file_name, &file_stat) < 0)
{
int nError = errno;
valid = false;
}
else
{
if (S_ISDIR(file_stat.st_mode))
{
valid = false;
}
else if (file_stat.st_mode & S_IROTH)
{
int fd = open(file_name, O_RDONLY);
file_buf = new char[file_stat.st_size + 1];
memset(file_buf, '\0', file_stat.st_size + 1);
if (read(fd, file_buf, file_stat.st_size) < 0)
{
valid = false;
}
}
else
{
valid = false;
}
}
if (valid)
{
ret = snprintf(header_buf, BUFFER_SIZE - 1, "%s %s\r\n", "HTTP/1.1", status_line[0]);
len += ret;
ret = snprintf(header_buf + len, BUFFER_SIZE - 1 - len,
"Content-Length: %d\r\n", file_stat.st_size);
len += ret;
ret = snprintf(header_buf + len, BUFFER_SIZE - 1 - len, "%s", "\r\n");
struct iovec iv[2];
iv[0].iov_base = header_buf;
iv[0].iov_len = strlen(header_buf);
iv[1].iov_base = file_buf;
iv[1].iov_len = file_stat.st_size;
ret = writev(connfd, iv, 2);
}
else
{
ret = snprintf(header_buf, BUFFER_SIZE - 1, "%s %s\r\n", "HTTP/1.1", status_line[1]);
len += ret;
ret = snprintf(header_buf + len, BUFFER_SIZE - 1 - len, "%s", "\r\n");
send(connfd, header_buf, strlen(header_buf), 0);
}
close(connfd);
delete[] file_buf;
}
close(sock);
return 0;
}
|