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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;
)
// 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")) error_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");
}
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