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
|
/* wget.c - Simple downloader to get the resource file in HTTP server
*
* Copyright 2016 Lipi C.H. Lee <lipisoft@gmail.com>
*
USE_WGET(NEWTOY(wget, "f:", TOYFLAG_USR|TOYFLAG_BIN))
config WGET
bool "wget"
default n
help
usage: wget -f filename URL
-f filename: specify the filename to be saved
URL: HTTP uniform resource location and only HTTP, not HTTPS
examples:
wget -f index.html http://www.example.com
wget -f sample.jpg http://www.example.com:8080/sample.jpg
*/
#define FOR_wget
#include "toys.h"
GLOBALS(
char *filename;
)
// extract hostname from url
static unsigned get_hn(const char *url, char *hostname) {
unsigned i;
for (i = 0; url[i] != '\0' && url[i] != ':' && url[i] != '/'; i++) {
if(i >= 1024) error_exit("too long hostname in URL");
hostname[i] = url[i];
}
hostname[i] = '\0';
return i;
}
// extract port number
static unsigned get_port(const char *url, char *port, unsigned url_i) {
unsigned i;
for (i = 0; url[i] != '\0' && url[i] != '/'; i++, url_i++) {
if('0' <= url[i] && url[i] <= '9') port[i] = url[i];
else error_exit("wrong decimal port number");
}
if(i <= 6) port[i] = '\0';
else error_exit("too long port number");
return url_i;
}
// get http infos in URL
static void get_info(const char *url, char* hostname, char *port, char *path) {
unsigned i = 7, len;
if (strncmp(url, "http://", i)) error_exit("only HTTP support");
len = get_hn(url+i, hostname);
i += len;
// get port if exists
if (url[i] == ':') {
i++;
i = get_port(url+i, port, i);
} else strcpy(port, "80");
// get uri in URL
if (url[i] == '\0') strcpy(path, "/");
else if (url[i] == '/') {
if (strlen(url+i) < 1024) strcpy(path, url+i);
else error_exit("too long path in URL");
} else error_exit("wrong URL");
}
// connect to any IPv4 or IPv6 server
static int conn_svr(const char *hostname, const char *port) {
struct addrinfo hints, *result, *rp;
int sock;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = 0;
hints.ai_protocol = 0;
if ((errno = getaddrinfo(hostname, port, &hints, &result)))
error_exit("getaddrinfo: %s", gai_strerror(errno));
// try all address list(IPv4 or IPv6) until success
for (rp = result; rp; rp = rp->ai_next) {
if ((sock = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol))
== -1) {
perror_msg("socket error");
continue;
}
if (connect(sock, rp->ai_addr, rp->ai_addrlen) != -1)
break; // succeed in connecting to any server IP
else perror_msg("connect error");
close(sock);
}
freeaddrinfo(result);
if(!rp) error_exit("can't connect");
return sock;
}
// make HTTP request header field
static void mk_fld(char *name, char *value) {
strcat(toybuf, name);
strcat(toybuf, ": ");
strcat(toybuf, value);
strcat(toybuf, "\r\n");
}
// get http response body starting address and its length
static char *get_body(ssize_t len, ssize_t *body_len) {
int i;
for (i = 0; i < len-4; i++)
if (!strncmp(toybuf+i, "\r\n\r\n", 4)) break;
*body_len = len - i - 4;
return toybuf+i+4;
}
void wget_main(void)
{
int sock;
FILE *fp;
ssize_t len, body_len;
char *body, *result, *rc, *r_str;
char ua[18] = "toybox wget/", ver[6], hostname[1024], port[6], path[1024];
// TODO extract filename to be saved from URL
if (!(toys.optflags & FLAG_f)) help_exit("no filename");
if (fopen(TT.filename, "r")) perror_exit("'%s' already exists", TT.filename);
if(!toys.optargs[0]) help_exit("no URL");
get_info(toys.optargs[0], hostname, port, path);
sock = conn_svr(hostname, port);
// compose HTTP request
sprintf(toybuf, "GET %s HTTP/1.1\r\n", path);
mk_fld("Host", hostname);
strncpy(ver, TOYBOX_VERSION, 5);
strcat(ua, ver);
mk_fld("User-Agent", ua);
mk_fld("Connection", "close");
strcat(toybuf, "\r\n");
// send the HTTP request
len = strlen(toybuf);
if (write(sock, toybuf, len) != len) perror_exit("write error");
// read HTTP response
if ((len = read(sock, toybuf, 4096)) == -1) perror_exit("read error");
if (!strstr(toybuf, "\r\n\r\n")) error_exit("too long HTTP response");
body = get_body(len, &body_len);
result = strtok(toybuf, "\r");
strtok(result, " ");
rc = strtok(NULL, " ");
r_str = strtok(NULL, " ");
// HTTP res code check
// TODO handle HTTP 302 Found(Redirection)
if (strcmp(rc, "200")) error_exit("res: %s(%s)", rc, r_str);
if (!(fp = fopen(TT.filename, "w"))) perror_exit("fopen error");
if (fwrite(body, 1, body_len, fp) != body_len)
error_exit("fwrite error");
while ((len = read(sock, toybuf, 4096)) > 0)
if (fwrite(toybuf, 1, len, fp) != len)
error_exit("fwrite error");
if (fclose(fp) == EOF) perror_exit("fclose error");
}
|
