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
|
#include "file.h"
#include <errno.h>
#include <linux/limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#define FILE_READBUF_SIZE 1024
const char *file_path_for_uri(const char *uri)
{
struct stat statbuf;
char path[PATH_MAX];
size_t result_len;
char *result;
getcwd(path, PATH_MAX);
strncat(path, uri, PATH_MAX - 1);
/* Append 'index.html' if this is a directory */
stat(path, &statbuf);
if (S_ISDIR(statbuf.st_mode))
strcat(path, "index.html");
/* Allocate a string with only the needed size */
result_len = strlen(path);
result = malloc(result_len + 1);
memcpy(result, path, result_len);
result[result_len] = '\0';
return result;
}
enum serve_method file_method_for_path(const char *filepath, enum http_res_code *code)
{
if (access(filepath, F_OK) != 0) {
*code = HTTP_RESPONSE_NOTFOUND;
return SERVE_METHOD_ERROR;
}
*code = HTTP_RESPONSE_OK;
if (strstr(filepath, ".php") != 0)
return SERVE_METHOD_PHP;
return SERVE_METHOD_FILE;
}
static const char *mime_type_for_path(const char *filepath)
{
const char *ext = strrchr(filepath, '.');
if (strcmp(ext, ".html") == 0)
return "text/html";
if (strcmp(ext, ".css") == 0)
return "text/css";
if (strcmp(ext, ".js") == 0)
return "text/javascript";
if (strcmp(ext, ".png") == 0)
return "image/png";
if (strcmp(ext, ".gif") == 0)
return "image/gif";
if (strcmp(ext, ".jpg") == 0 || strcmp(ext, ".jpeg") == 0)
return "image/jpeg";
if (strcmp(ext, ".webp") == 0)
return "image/webp";
return "text/plain";
}
int file_read(const char *filepath, int sockfd)
{
FILE *fp;
char buffer[FILE_READBUF_SIZE];
const char *mime_type;
size_t bytes_read;
fp = fopen(filepath, "rb");
if (fp == NULL) {
perror("Failed to open file");
return 1;
}
mime_type = mime_type_for_path(filepath);
write(sockfd, "Content-Type: ", 14);
write(sockfd, mime_type, strlen(mime_type));
write(sockfd, "\r\n\r\n", 4);
while ((bytes_read = fread(buffer, 1, FILE_READBUF_SIZE, fp)) > 0)
write(sockfd, buffer, bytes_read);
fclose(fp);
return 0;
}
static void cgi_setup_env(const char *filepath, const struct http_request *req)
{
if (req->method == HTTP_METHOD_GET) {
setenv("REQUEST_METHOD", "GET", 1);
} else if (req->method == HTTP_METHOD_POST) {
setenv("REQUEST_METHOD", "POST", 1);
}
setenv("SCRIPT_FILENAME", filepath, 1);
if (req->query_str)
setenv("QUERY_STRING", req->query_str, 1);
if (req->body) {
static char intbuf[20];
static char *content_type = "application/x-www-form-urlencoded";
sprintf(intbuf, "%ld", strlen(req->body));
setenv("CONTENT_LENGTH", intbuf, 1);
setenv("CONTENT_TYPE", content_type, strlen(content_type));
}
}
int file_read_php(const char *filepath, const struct http_request *req, int sockfd)
{
int readfds[2];
int writefds[2];
pid_t pid;
char buffer[FILE_READBUF_SIZE];
size_t bytes_read;
cgi_setup_env(filepath, req);
/* Create pipes for reading from and writing to the child process. */
if (pipe(readfds) == -1) {
perror("read pipe");
return 1;
}
if (req->body && pipe(writefds) == -1) {
perror("write pipe");
return 1;
}
pid = fork();
if (pid == -1) {
perror("fork");
return 1;
}
if (pid == 0) {
close(readfds[0]);
if (readfds[1] != STDOUT_FILENO) {
dup2(readfds[1], STDOUT_FILENO);
close(readfds[1]);
}
if (req->body != NULL) {
close(writefds[1]);
if (writefds[0] != STDIN_FILENO) {
dup2(writefds[0], STDIN_FILENO);
close(writefds[0]);
}
}
execl("/usr/bin/php-cgi", "php-cgi", NULL);
/* We should only end up here if there's an error. */
perror("exec");
exit(1);
}
close(readfds[1]);
if (req->body != NULL) {
/* Write to stdin of child process. */
close(writefds[0]);
write(writefds[1], req->body, strlen(req->body) + 1);
}
/* Read its output from stdout. */
while ((bytes_read = read(readfds[0], buffer, FILE_READBUF_SIZE)) > 0)
write(sockfd, buffer, bytes_read);
unsetenv("QUERY_STRING");
unsetenv("CONTENT");
unsetenv("CONTENT_LENGTH");
close(readfds[0]);
close(writefds[1]);
return 0;
}
|
