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/* 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;
)
#define HN_LEN 128 // HOSTNAME MAX LENGTH
#define PATH_LEN 256 // PATH MAX LENGTH
struct httpinfo {
char hostname[HN_LEN];
char port[6]; // MAX port value: 65535
char path[PATH_LEN];
};
// extract hostname from url
static unsigned int get_hn(char *url, char *hn) {
unsigned int i;
for (i = 0; url[i] != '\0' && url[i] != ':' && url[i] != '/'; i++) {
if(i >= HN_LEN)
error_exit("The hostname's length is lower than %d.", HN_LEN);
hn[i] = url[i];
}
hn[i] = '\0';
return i;
}
// extract port number
static void get_port(char *url, char *port, unsigned int *url_i) {
unsigned int 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("Port is invalid");
}
if(i <= 6) port[i] = '\0';
else error_exit("Port number is too long");
}
// get http infos in URL
static void get_info(struct httpinfo *hi, char *url) {
unsigned int i = 7, len;
if (strncmp(url, "http://", i)) error_exit("Only HTTP can be supported.");
len = get_hn(url+i, hi->hostname);
i += len;
// get port if exists
if (url[i] == ':') {
i++;
get_port(url+i, hi->port, &i);
} else strcpy(hi->port, "80");
// get uri in URL
if (url[i] == '\0') strcpy(hi->path, "/");
else if (url[i] == '/') {
if (strlen(url+i) < PATH_LEN) strcpy(hi->path, url+i);
else error_exit("The URL path's length is less than %d.", PATH_LEN);
} else error_exit("The URL is NOT valid.");
}
// 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 not connect to HTTP server");
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");
}
// make http request
static void mk_rq(char *path) {
strcpy(toybuf, "GET ");
strcat(toybuf, path);
strcat(toybuf, " HTTP/1.1\r\n");
}
// get http response body starting address and its length
static char *get_body(size_t len, size_t *body_len) {
unsigned 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;
struct httpinfo hi;
FILE *fp;
size_t len, body_len;
char *body, *result, *rc, *r_str, ua[18] = "toybox wget/", ver[6];
// TODO extract filename to be saved from URL
if (!(toys.optflags & FLAG_f))
help_exit("The filename to be saved should be needed.");
if (fopen(TT.filename, "r"))
error_exit("The file(%s) you specified already exists.", TT.filename);
if(!toys.optargs[0]) help_exit("The URL should be specified.");
get_info(&hi, toys.optargs[0]);
sock = conn_svr(hi.hostname, hi.port);
// compose HTTP request
mk_rq(hi.path);
mk_fld("Host", hi.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("HTTP GET failed.");
// read HTTP response
if ((len = read(sock, toybuf, 4096)) == -1)
perror_exit("HTTP response failed.");
if (!strstr(toybuf, "\r\n\r\n"))
error_exit("HTTP response header is too long.");
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("HTTP response: %s(%s).", rc, r_str);
if (!(fp = fopen(TT.filename, "w"))) perror_exit("File write error");
if (fwrite(body, sizeof(char), body_len, fp) != body_len)
error_exit("File write is not successful.");
while ((len = read(sock, toybuf, 4096)) > 0)
if (fwrite(toybuf, sizeof(char), len, fp) != len)
error_exit("File write is not successful.");
if (fclose(fp) == EOF) perror_exit("File Close Error");
}
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