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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, "(no-check-certificate)O:", TOYFLAG_USR|TOYFLAG_BIN))
config WGET
bool "wget"
default n
help
usage: wget -O filename URL
-O filename: specify output filename
URL: uniform resource location, FTP/HTTP only, not HTTPS
examples:
wget -O index.html http://www.example.com
wget -O sample.jpg ftp://ftp.example.com:21/sample.jpg
*/
#define FOR_wget
#include "toys.h"
GLOBALS(
char *filename;
)
// extract hostname and port from url
static unsigned get_hn(const char *url, char *hostname) {
unsigned i;
for (i = 0; url[i] != '\0' && 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;
}
static void strip_v6_brackets(char* hostname) {
size_t len = strlen(hostname);
if (len > 1023) {
error_exit("hostname too long, %d bytes\n", len);
}
char * closing_bracket = strchr(hostname, ']');
if (closing_bracket && closing_bracket == hostname + len - 1) {
if (strchr(hostname, '[') == hostname) {
hostname[len-1] = 0;
memmove(hostname, hostname + 1, len - 1);
}
}
}
// get http infos in URL
static void get_info(const char *url, char* hostname, char *port, char *path) {
unsigned i = 7, len;
char ftp = !strncmp(url, "ftp://", 6);
if (ftp) i--;
else if (strncmp(url, "http://", i)) error_exit("only FTP/HTTP support");
len = get_hn(url+i, hostname);
i += len;
// `hostname` now contains `host:port`, where host can be any of: a raw IPv4
// address; a bracketed, raw IPv6 address, or a hostname. Extract port, if it exists,
// by searching for the last ':' in the hostname string.
char *port_delim = strrchr(hostname, ':');
char use_default_port = 1;
if (port_delim) {
// Found a colon; is there a closing bracket after it? If so,
// then this colon was in the middle of a bracketed IPv6 address
if (!strchr(port_delim, ']')) {
// No closing bracket; this is a real port
use_default_port = 0;
get_port(port_delim + 1, port, 0);
// Mark the new end of the hostname string
*port_delim = 0;
}
}
if (use_default_port) {
strcpy(port, "80");
}
// This is a NOP if hostname is not a bracketed IPv6 address
strip_v6_brackets(hostname);
// 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");
if (ftp) xexec((char *[]){"ftpget", hostname, TT.filename, path, 0});
}
// 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, redirects = 10;
FILE *fp;
ssize_t len, body_len;
char *body, *result, *rc, *r_str, *redir_loc = 0;
char ua[] = "toybox wget/" TOYBOX_VERSION, hostname[1024], port[6], path[1024];
// TODO extract filename to be saved from URL
if (!(toys.optflags & FLAG_O)) 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);
for (;; redirects--) {
sock = conn_svr(hostname, port);
// compose HTTP request
sprintf(toybuf, "GET %s HTTP/1.1\r\n", path);
mk_fld("Host", hostname);
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);
redir_loc = strstr(toybuf, "Location: ");
result = strtok(toybuf, "\r");
strtok(result, " ");
rc = strtok(NULL, " ");
r_str = strtok(NULL, " ");
// HTTP res code check
if (!strcmp(rc, "301") || !strcmp(rc, "302")) {
char* eol = 0;
if ((eol = strchr(redir_loc, '\r')) > 0) *eol = 0;
else if (redir_loc) error_exit("Could not parse redirect URL");
if (redirects < 0) error_exit("Too many redirects");
printf("Redirection: %s %s \n", rc, r_str);
printf("%s \n", redir_loc);
redir_loc = redir_loc+strlen("Location: ");
close(sock);
get_info(redir_loc, hostname, port, path);
} else if (!strcmp(rc, "200")) break;
else 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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