File: [cvs.NetBSD.org] / src / usr.bin / ftp / fetch.c (download)
Revision 1.65, Sun Aug 22 12:49:00 1999 UTC (24 years, 8 months ago) by lukem
Branch: MAIN
Changes since 1.64: +32 -15
lines
fetch_url() fixes:
- just display the hostname:port of the proxy url, rather than the full url.
this prevents someone `shoulder surfing' a proxy username/password
in $http_proxy. [suggested by perry]
- compact verbose notes for http fetchs; now displays
(via host:port, with authorization, with proxy authorization)
with each component being optional.
(and a couple introduced with the ipv6 mods...)
- don't override host with the canonical name; this prevented fetches from
http/1.1 virtual hosts from working if the virtual host was a CNAME.
[noted by bernd]
- call freeaddrinfo() if res was built with getaddrinfo()
|
/* $NetBSD: fetch.c,v 1.65 1999/08/22 12:49:00 lukem Exp $ */
/*-
* Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: fetch.c,v 1.65 1999/08/22 12:49:00 lukem Exp $");
#endif /* not lint */
/*
* FTP User Program -- Command line file retrieval
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/utsname.h>
#include <netinet/in.h>
#include <arpa/ftp.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <util.h>
#include "ftp_var.h"
typedef enum {
UNKNOWN_URL_T=-1,
HTTP_URL_T,
FTP_URL_T,
FILE_URL_T,
CLASSIC_URL_T
} url_t;
void aborthttp __P((int));
static int auth_url __P((const char *, char **, const char *,
const char *));
static void base64_encode __P((const char *, size_t, char *));
static int go_fetch __P((const char *));
static int fetch_ftp __P((const char *));
static int fetch_url __P((const char *, const char *, char *, char *));
static int parse_url __P((const char *, const char *, url_t *, char **,
char **, char **, char **, char **));
static void url_decode __P((char *));
static int redirect_loop;
#define ABOUT_URL "about:" /* propaganda */
#define FILE_URL "file://" /* file URL prefix */
#define FTP_URL "ftp://" /* ftp URL prefix */
#define HTTP_URL "http://" /* http URL prefix */
#define EMPTYSTRING(x) ((x) == NULL || (*(x) == '\0'))
#define FREEPTR(x) if ((x) != NULL) { free(x); (x) = NULL; }
/*
* Generate authorization response based on given authentication challenge.
* Returns -1 if an error occurred, otherwise 0.
* Sets response to a malloc(3)ed string; caller should free.
*/
static int
auth_url(challenge, response, guser, gpass)
const char *challenge;
char **response;
const char *guser;
const char *gpass;
{
char *cp, *ep, *clear, *line, *realm, *scheme;
char user[BUFSIZ], *pass;
int rval;
size_t len;
*response = NULL;
clear = realm = scheme = NULL;
rval = -1;
line = xstrdup(challenge);
cp = line;
if (debug)
fprintf(ttyout, "auth_url: challenge `%s'\n", challenge);
scheme = strsep(&cp, " ");
#define SCHEME_BASIC "Basic"
if (strncasecmp(scheme, SCHEME_BASIC, sizeof(SCHEME_BASIC) - 1) != 0) {
warnx("Unsupported WWW Authentication challenge - `%s'",
challenge);
goto cleanup_auth_url;
}
cp += strspn(cp, " ");
#define REALM "realm=\""
if (strncasecmp(cp, REALM, sizeof(REALM) - 1) == 0)
cp += sizeof(REALM) - 1;
else {
warnx("Unsupported WWW Authentication challenge - `%s'",
challenge);
goto cleanup_auth_url;
}
if ((ep = strchr(cp, '\"')) != NULL) {
size_t len = ep - cp;
realm = (char *)xmalloc(len + 1);
strncpy(realm, cp, len);
realm[len] = '\0';
} else {
warnx("Unsupported WWW Authentication challenge - `%s'",
challenge);
goto cleanup_auth_url;
}
if (guser != NULL) {
strncpy(user, guser, sizeof(user) - 1);
user[sizeof(user) - 1] = '\0';
} else {
fprintf(ttyout, "Username for `%s': ", realm);
(void)fflush(ttyout);
if (fgets(user, sizeof(user) - 1, stdin) == NULL)
goto cleanup_auth_url;
user[strlen(user) - 1] = '\0';
}
if (gpass != NULL)
pass = (char *)gpass;
else
pass = getpass("Password: ");
len = strlen(user) + strlen(pass) + 2; /* user + ":" + pass + "\0" */
clear = (char *)xmalloc(len);
snprintf(clear, len, "%s:%s", user, pass);
if (gpass == NULL)
memset(pass, '\0', strlen(pass));
/* scheme + " " + enc + "\0" */
len = strlen(scheme) + 1 + (len + 2) * 4 / 3 + 1;
*response = (char *)xmalloc(len);
len = snprintf(*response, len, "%s ", scheme);
base64_encode(clear, strlen(clear), *response + len);
memset(clear, '\0', strlen(clear));
rval = 0;
cleanup_auth_url:
FREEPTR(clear);
FREEPTR(line);
FREEPTR(realm);
return (rval);
}
/*
* Encode len bytes starting at clear using base64 encoding into encoded,
* which should be at least ((len + 2) * 4 / 3 + 1) in size.
*/
void
base64_encode(clear, len, encoded)
const char *clear;
size_t len;
char *encoded;
{
static const char enc[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
char *cp;
int i;
cp = encoded;
for (i = 0; i < len; i += 3) {
*(cp++) = enc[((clear[i + 0] >> 2))];
*(cp++) = enc[((clear[i + 0] << 4) & 0x30)
| ((clear[i + 1] >> 4) & 0x0f)];
*(cp++) = enc[((clear[i + 1] << 2) & 0x3c)
| ((clear[i + 2] >> 6) & 0x03)];
*(cp++) = enc[((clear[i + 2] ) & 0x3f)];
}
*cp = '\0';
while (i-- > len)
*(--cp) = '=';
}
/*
* Decode %xx escapes in given string, `in-place'.
*/
static void
url_decode(url)
char *url;
{
unsigned char *p, *q;
if (EMPTYSTRING(url))
return;
p = q = url;
#define HEXTOINT(x) (x - (isdigit(x) ? '0' : (islower(x) ? 'a' : 'A') - 10))
while (*p) {
if (p[0] == '%'
&& p[1] && isxdigit((unsigned char)p[1])
&& p[2] && isxdigit((unsigned char)p[2])) {
*q++ = HEXTOINT(p[1]) * 16 + HEXTOINT(p[2]);
p+=3;
} else
*q++ = *p++;
}
*q = '\0';
}
/*
* Parse URL of form:
* <type>://[<user>[:<password>@]]<host>[:<port>][/<path>]
* Returns -1 if a parse error occurred, otherwise 0.
* It's the caller's responsibility to url_decode() the returned
* user, pass and path.
*
* Sets type to url_t, each of the given char ** pointers to a
* malloc(3)ed strings of the relevant section, and port to
* the number given, or ftpport if ftp://, or httpport if http://.
*
* If <host> is surrounded by `[' and ']', it's parsed as an
* IPv6 address (as per draft-ietf-ipngwg-url-literal-01.txt).
*
* XXX: this is not totally RFC 1738 compliant; <path> will have the
* leading `/' unless it's an ftp:// URL, as this makes things easier
* for file:// and http:// URLs. ftp:// URLs have the `/' between the
* host and the url-path removed, but any additional leading slashes
* in the url-path are retained (because they imply that we should
* later do "CWD" with a null argument).
*
* Examples:
* input url output path
* --------- -----------
* "ftp://host" NULL
* "http://host/" NULL
* "file://host/dir/file" "dir/file"
* "ftp://host/" ""
* "ftp://host//" NULL
* "ftp://host//dir/file" "/dir/file"
*/
static int
parse_url(url, desc, type, user, pass, host, port, path)
const char *url;
const char *desc;
url_t *type;
char **user;
char **pass;
char **host;
char **port;
char **path;
{
char *cp, *ep, *thost, *tport;
size_t len;
if (url == NULL || desc == NULL || type == NULL || user == NULL
|| pass == NULL || host == NULL || port == NULL || path == NULL)
errx(1, "parse_url: invoked with NULL argument!");
*type = UNKNOWN_URL_T;
*user = *pass = *host = *port = *path = NULL;
tport = NULL;
if (strncasecmp(url, HTTP_URL, sizeof(HTTP_URL) - 1) == 0) {
url += sizeof(HTTP_URL) - 1;
*type = HTTP_URL_T;
tport = httpport;
} else if (strncasecmp(url, FTP_URL, sizeof(FTP_URL) - 1) == 0) {
url += sizeof(FTP_URL) - 1;
*type = FTP_URL_T;
tport = ftpport;
} else if (strncasecmp(url, FILE_URL, sizeof(FILE_URL) - 1) == 0) {
url += sizeof(FILE_URL) - 1;
*type = FILE_URL_T;
} else {
warnx("Invalid %s `%s'", desc, url);
cleanup_parse_url:
FREEPTR(*user);
FREEPTR(*pass);
FREEPTR(*host);
FREEPTR(*port);
FREEPTR(*path);
return (-1);
}
if (*url == '\0')
return (0);
/* find [user[:pass]@]host[:port] */
ep = strchr(url, '/');
if (ep == NULL)
thost = xstrdup(url);
else {
len = ep - url;
thost = (char *)xmalloc(len + 1);
strncpy(thost, url, len);
thost[len] = '\0';
if (*type == FTP_URL_T) /* skip first / for ftp URLs */
ep++;
*path = xstrdup(ep);
}
cp = strchr(thost, '@'); /* look for user[:pass]@ in URLs */
if (cp != NULL) {
if (*type == FTP_URL_T)
anonftp = 0; /* disable anonftp */
*user = thost;
*cp = '\0';
thost = xstrdup(cp + 1);
cp = strchr(*user, ':');
if (cp != NULL) {
*cp = '\0';
*pass = xstrdup(cp + 1);
}
}
#ifdef INET6
/*
* Check if thost is an encoded IPv6 address, as per
* draft-ietf-ipngwg-url-literal-01.txt:
* `[' ipv6-address ']'
*/
if (*thost == '[') {
cp = thost + 1;
if ((ep = strchr(cp, ']')) == NULL ||
(ep[1] != '\0' && ep[1] != '\0')) {
warnx("Invalid address `%s' in %s `%s'",
thost, desc, url);
goto cleanup_parse_url;
}
len = ep - cp; /* change `[xxx]' -> `xxx' */
memmove(thost, thost + 1, len);
thost[len] = '\0';
if (! isipv6addr(thost)) {
warnx("Invalid IPv6 address `%s' in %s `%s'",
thost, desc, url);
goto cleanup_parse_url;
}
cp = ep + 1;
if (*cp == ':')
cp++;
else
cp = NULL;
} else
#endif /* INET6 */
if ((cp = strchr(thost, ':')) != NULL)
*cp++ = '\0';
*host = thost;
/* look for [:port] */
if (cp != NULL) {
long nport;
nport = strtol(cp, &ep, 10);
if (nport < 1 || nport > MAX_IN_PORT_T || *ep != '\0') {
warnx("Invalid port `%s' in %s `%s'", cp, desc, url);
goto cleanup_parse_url;
}
tport = cp;
}
if (tport != NULL);
*port = xstrdup(tport);
if (debug)
fprintf(ttyout,
"parse_url: user `%s' pass `%s' host %s:%s path `%s'\n",
*user ? *user : "<null>", *pass ? *pass : "<null>",
*host ? *host : "<null>", *port ? *port : "<null>",
*path ? *path : "<null>");
return (0);
}
jmp_buf httpabort;
/*
* Retrieve URL, via a proxy if necessary, using HTTP.
* If proxyenv is set, use that for the proxy, otherwise try ftp_proxy or
* http_proxy as appropriate.
* Supports HTTP redirects.
* Returns -1 on failure, 0 on completed xfer, 1 if ftp connection
* is still open (e.g, ftp xfer with trailing /)
*/
static int
fetch_url(url, proxyenv, proxyauth, wwwauth)
const char *url;
const char *proxyenv;
char *proxyauth;
char *wwwauth;
{
struct addrinfo hints, *res;
volatile sig_t oldintr, oldintp;
volatile int s;
int ischunked, isproxy, rval, hcode;
size_t len;
char *cp, *ep, *buf, *savefile;
char *auth, *location, *message;
char *user, *pass, *host, *port, *path, *decodedpath;
char *puser, *ppass;
off_t hashbytes;
int (*closefunc) __P((FILE *));
FILE *fin, *fout;
time_t mtime;
url_t urltype;
in_port_t portnum;
int error;
closefunc = NULL;
fin = fout = NULL;
s = -1;
buf = savefile = NULL;
auth = location = message = NULL;
ischunked = isproxy = hcode = 0;
rval = 1;
res = NULL;
user = pass = host = path = decodedpath = puser = ppass = NULL;
#ifdef __GNUC__ /* shut up gcc warnings */
(void)&closefunc;
(void)&fin;
(void)&fout;
(void)&buf;
(void)&savefile;
(void)&rval;
(void)&isproxy;
(void)&hcode;
(void)&ischunked;
(void)&message;
(void)&location;
(void)&auth;
(void)&decodedpath;
#endif
if (parse_url(url, "URL", &urltype, &user, &pass, &host, &port, &path)
== -1)
goto cleanup_fetch_url;
portnum = strtol(port, NULL, 10);
if (urltype == FILE_URL_T && ! EMPTYSTRING(host)
&& strcasecmp(host, "localhost") != 0) {
warnx("No support for non local file URL `%s'", url);
goto cleanup_fetch_url;
}
if (EMPTYSTRING(path)) {
if (urltype == FTP_URL_T) {
rval = fetch_ftp(url);
goto cleanup_fetch_url;
}
if (urltype != HTTP_URL_T || outfile == NULL) {
warnx("Invalid URL (no file after host) `%s'", url);
goto cleanup_fetch_url;
}
}
decodedpath = xstrdup(path);
url_decode(decodedpath);
if (outfile)
savefile = xstrdup(outfile);
else {
cp = strrchr(decodedpath, '/'); /* find savefile */
if (cp != NULL)
savefile = xstrdup(cp + 1);
else
savefile = xstrdup(decodedpath);
}
if (EMPTYSTRING(savefile)) {
if (urltype == FTP_URL_T) {
rval = fetch_ftp(url);
goto cleanup_fetch_url;
}
warnx("Invalid URL (no file after directory) `%s'", url);
goto cleanup_fetch_url;
} else {
if (debug)
fprintf(ttyout, "got savefile as `%s'\n", savefile);
}
filesize = -1;
mtime = -1;
if (urltype == FILE_URL_T) { /* file:// URLs */
struct stat sb;
direction = "copied";
fin = fopen(decodedpath, "r");
if (fin == NULL) {
warn("Cannot open file `%s'", decodedpath);
goto cleanup_fetch_url;
}
if (fstat(fileno(fin), &sb) == 0) {
mtime = sb.st_mtime;
filesize = sb.st_size;
}
if (verbose)
fprintf(ttyout, "Copying %s\n", decodedpath);
} else { /* ftp:// or http:// URLs */
char *leading;
int hasleading;
if (proxyenv == NULL) {
if (urltype == HTTP_URL_T)
proxyenv = httpproxy;
else if (urltype == FTP_URL_T)
proxyenv = ftpproxy;
}
direction = "retrieved";
if (proxyenv != NULL) { /* use proxy */
url_t purltype;
char *phost, *ppath;
char *pport;
isproxy = 1;
/* check URL against list of no_proxied sites */
if (no_proxy != NULL) {
char *np, *np_copy;
long np_port;
size_t hlen, plen;
np_copy = xstrdup(no_proxy);
hlen = strlen(host);
while ((cp = strsep(&np_copy, " ,")) != NULL) {
if (*cp == '\0')
continue;
if ((np = strrchr(cp, ':')) != NULL) {
*np = '\0';
np_port =
strtol(np + 1, &ep, 10);
if (*ep != '\0')
continue;
if (portnum !=
htons((in_port_t)np_port))
continue;
}
plen = strlen(cp);
if (strncasecmp(host + hlen - plen,
cp, plen) == 0) {
isproxy = 0;
break;
}
}
FREEPTR(np_copy);
}
if (isproxy) {
if (parse_url(proxyenv, "proxy URL", &purltype,
&puser, &ppass, &phost, &pport, &ppath)
== -1)
goto cleanup_fetch_url;
if ((purltype != HTTP_URL_T
&& purltype != FTP_URL_T) ||
EMPTYSTRING(phost) ||
(! EMPTYSTRING(ppath)
&& strcmp(ppath, "/") != 0)) {
warnx("Malformed proxy URL `%s'",
proxyenv);
FREEPTR(phost);
FREEPTR(pport);
FREEPTR(ppath);
goto cleanup_fetch_url;
}
FREEPTR(host);
host = phost;
FREEPTR(port);
port = pport;
FREEPTR(path);
path = xstrdup(url);
FREEPTR(ppath);
}
} /* proxyenv != NULL */
#if 0
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
if (isdigit((unsigned char)host[0])) {
if (inet_aton(host, &sin.sin_addr) == 0) {
warnx("Invalid IP address `%s'", host);
goto cleanup_fetch_url;
}
} else {
hp = gethostbyname(host);
if (hp == NULL) {
warnx("%s: %s", host, hstrerror(h_errno));
goto cleanup_fetch_url;
}
if (hp->h_addrtype != AF_INET) {
warnx("`%s': not an Internet address?", host);
goto cleanup_fetch_url;
}
memcpy(&sin.sin_addr, hp->h_addr, hp->h_length);
}
if (port == NULL) {
warnx("Unknown port for URL `%s'", url);
goto cleanup_fetch_url;
}
sin.sin_port = portnum;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s == -1) {
warn("Can't create socket");
goto cleanup_fetch_url;
}
while (xconnect(s, (struct sockaddr *)&sin,
sizeof(sin)) == -1) {
if (errno == EINTR)
continue;
if (hp && hp->h_addr_list[1]) {
int oerrno = errno;
char *ia;
ia = inet_ntoa(sin.sin_addr);
errno = oerrno;
warn("Connect to address `%s'", ia);
hp->h_addr_list++;
memcpy(&sin.sin_addr, hp->h_addr_list[0],
(size_t)hp->h_length);
if (verbose)
fprintf(ttyout, "Trying %s...\n",
inet_ntoa(sin.sin_addr));
(void)close(s);
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0) {
warn("Can't create socket");
goto cleanup_fetch_url;
}
continue;
}
warn("Can't connect to `%s'", host);
goto cleanup_fetch_url;
}
#else
memset(&hints, 0, sizeof(hints));
hints.ai_flags = 0;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
error = getaddrinfo(host, port, &hints, &res);
if (error) {
warn(gai_strerror(error));
goto cleanup_fetch_url;
}
while (1) {
s = socket(res->ai_family,
res->ai_socktype, res->ai_protocol);
if (s < 0) {
warn("Can't create socket");
goto cleanup_fetch_url;
}
if (xconnect(s, res->ai_addr, res->ai_addrlen) < 0) {
char hbuf[MAXHOSTNAMELEN];
getnameinfo(res->ai_addr, res->ai_addrlen,
hbuf, sizeof(hbuf), NULL, 0,
NI_NUMERICHOST);
warn("Connect to address `%s'", hbuf);
close(s);
res = res->ai_next;
if (res) {
getnameinfo(res->ai_addr,
res->ai_addrlen, hbuf, sizeof(hbuf),
NULL, 0, NI_NUMERICHOST);
if (verbose)
fprintf(ttyout,
"Trying %s...\n", hbuf);
continue;
}
warn("Can't connect to %s", host);
goto cleanup_fetch_url;
}
break;
}
#endif
fin = fdopen(s, "r+");
/*
* Construct and send the request.
*/
if (verbose)
fprintf(ttyout, "Requesting %s\n", url);
leading = " (";
hasleading = 0;
if (isproxy) {
if (verbose) {
fprintf(ttyout, "%svia %s:%s", leading,
host, port);
leading = ", ";
hasleading++;
}
fprintf(fin, "GET %s HTTP/1.0\r\n", path);
if (flushcache)
fprintf(fin, "Pragma: no-cache\r\n");
} else {
struct utsname unam;
fprintf(fin, "GET %s HTTP/1.1\r\n", path);
fprintf(fin, "Host: %s:%s\r\n", host, port);
fprintf(fin, "Accept: */*\r\n");
if (uname(&unam) != -1) {
fprintf(fin, "User-Agent: %s-%s/ftp\r\n",
unam.sysname, unam.release);
}
fprintf(fin, "Connection: close\r\n");
if (flushcache)
fprintf(fin, "Cache-Control: no-cache\r\n");
}
if (wwwauth) {
if (verbose) {
fprintf(ttyout, "%swith authorization",
leading);
leading = ", ";
hasleading++;
}
fprintf(fin, "Authorization: %s\r\n", wwwauth);
}
if (proxyauth) {
if (verbose) {
fprintf(ttyout,
"%swith proxy authorization", leading);
leading = ", ";
hasleading++;
}
fprintf(fin, "Proxy-Authorization: %s\r\n", proxyauth);
}
if (verbose && hasleading)
fputs(")\n", ttyout);
fprintf(fin, "\r\n");
if (fflush(fin) == EOF) {
warn("Writing HTTP request");
goto cleanup_fetch_url;
}
/* Read the response */
if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0)) == NULL) {
warn("Receiving HTTP reply");
goto cleanup_fetch_url;
}
while (len > 0 && (buf[len-1] == '\r' || buf[len-1] == '\n'))
buf[--len] = '\0';
if (debug)
fprintf(ttyout, "received `%s'\n", buf);
/* Determine HTTP response code */
cp = strchr(buf, ' ');
if (cp == NULL)
goto improper;
else
cp++;
hcode = strtol(cp, &ep, 10);
if (*ep != '\0' && !isspace((unsigned char)*ep))
goto improper;
message = xstrdup(cp);
/* Read the rest of the header. */
FREEPTR(buf);
while (1) {
if ((buf = fparseln(fin, &len, NULL, "\0\0\0", 0))
== NULL) {
warn("Receiving HTTP reply");
goto cleanup_fetch_url;
}
while (len > 0 &&
(buf[len-1] == '\r' || buf[len-1] == '\n'))
buf[--len] = '\0';
if (len == 0)
break;
if (debug)
fprintf(ttyout, "received `%s'\n", buf);
/* Look for some headers */
cp = buf;
#define CONTENTLEN "Content-Length: "
if (strncasecmp(cp, CONTENTLEN,
sizeof(CONTENTLEN) - 1) == 0) {
cp += sizeof(CONTENTLEN) - 1;
filesize = strtol(cp, &ep, 10);
if (filesize < 1 || *ep != '\0')
goto improper;
if (debug)
fprintf(ttyout,
#ifndef NO_QUAD
"parsed length as: %qd\n",
(long long)filesize);
#else
"parsed length as: %ld\n",
(long)filesize);
#endif
#define LASTMOD "Last-Modified: "
} else if (strncasecmp(cp, LASTMOD,
sizeof(LASTMOD) - 1) == 0) {
struct tm parsed;
char *t;
cp += sizeof(LASTMOD) - 1;
/* RFC 1123 */
if ((t = strptime(cp,
"%a, %d %b %Y %H:%M:%S GMT",
&parsed))
/* RFC 850 */
|| (t = strptime(cp,
"%a, %d-%b-%y %H:%M:%S GMT",
&parsed))
/* asctime */
|| (t = strptime(cp,
"%a, %b %d %H:%M:%S %Y",
&parsed))) {
parsed.tm_isdst = -1;
if (*t == '\0')
mtime = mkgmtime(&parsed);
if (debug && mtime != -1) {
fprintf(ttyout,
"parsed date as: %s",
ctime(&mtime));
}
}
#define LOCATION "Location: "
} else if (strncasecmp(cp, LOCATION,
sizeof(LOCATION) - 1) == 0) {
cp += sizeof(LOCATION) - 1;
location = xstrdup(cp);
if (debug)
fprintf(ttyout,
"parsed location as: %s\n", cp);
#define TRANSENC "Transfer-Encoding: "
} else if (strncasecmp(cp, TRANSENC,
sizeof(TRANSENC) - 1) == 0) {
cp += sizeof(TRANSENC) - 1;
if (strcasecmp(cp, "chunked") != 0) {
warnx(
"Unsupported transfer encoding - `%s'",
cp);
goto cleanup_fetch_url;
}
ischunked++;
if (debug)
fprintf(ttyout,
"using chunked encoding\n");
#define PROXYAUTH "Proxy-Authenticate: "
} else if (strncasecmp(cp, PROXYAUTH,
sizeof(PROXYAUTH) - 1) == 0) {
cp += sizeof(PROXYAUTH) - 1;
FREEPTR(auth);
auth = xstrdup(cp);
if (debug)
fprintf(ttyout,
"parsed proxy-auth as: %s\n", cp);
#define WWWAUTH "WWW-Authenticate: "
} else if (strncasecmp(cp, WWWAUTH,
sizeof(WWWAUTH) - 1) == 0) {
cp += sizeof(WWWAUTH) - 1;
FREEPTR(auth);
auth = xstrdup(cp);
if (debug)
fprintf(ttyout,
"parsed www-auth as: %s\n", cp);
}
}
/* finished parsing header */
FREEPTR(buf);
switch (hcode) {
case 200:
break;
case 300:
case 301:
case 302:
case 303:
case 305:
if (EMPTYSTRING(location)) {
warnx(
"No redirection Location provided by server");
goto cleanup_fetch_url;
}
if (redirect_loop++ > 5) {
warnx("Too many redirections requested");
goto cleanup_fetch_url;
}
if (hcode == 305) {
if (verbose)
fprintf(ttyout, "Redirected via %s\n",
location);
rval = fetch_url(url, location,
proxyauth, wwwauth);
} else {
if (verbose)
fprintf(ttyout, "Redirected to %s\n",
location);
rval = go_fetch(location);
}
goto cleanup_fetch_url;
case 401:
case 407:
{
char **authp;
char *auser, *apass;
fprintf(ttyout, "%s\n", message);
if (EMPTYSTRING(auth)) {
warnx(
"No authentication challenge provided by server");
goto cleanup_fetch_url;
}
if (hcode == 401) {
authp = &wwwauth;
auser = user;
apass = pass;
} else {
authp = &proxyauth;
auser = puser;
apass = ppass;
}
if (*authp != NULL) {
char reply[10];
fprintf(ttyout,
"Authorization failed. Retry (y/n)? ");
if (fgets(reply, sizeof(reply), stdin) != NULL
&& tolower(reply[0]) != 'y')
goto cleanup_fetch_url;
auser = NULL;
apass = NULL;
}
if (auth_url(auth, authp, auser, apass) == 0) {
rval = fetch_url(url, proxyenv,
proxyauth, wwwauth);
memset(*authp, '\0', strlen(*authp));
FREEPTR(*authp);
}
goto cleanup_fetch_url;
}
default:
if (message)
warnx("Error retrieving file - `%s'", message);
else
warnx("Unknown error retrieving file");
goto cleanup_fetch_url;
}
} /* end of ftp:// or http:// specific setup */
oldintr = oldintp = NULL;
/* Open the output file. */
if (strcmp(savefile, "-") == 0) {
fout = stdout;
} else if (*savefile == '|') {
oldintp = signal(SIGPIPE, SIG_IGN);
fout = popen(savefile + 1, "w");
if (fout == NULL) {
warn("Can't run `%s'", savefile + 1);
goto cleanup_fetch_url;
}
closefunc = pclose;
} else {
fout = fopen(savefile, "w");
if (fout == NULL) {
warn("Can't open `%s'", savefile);
goto cleanup_fetch_url;
}
closefunc = fclose;
}
/* Trap signals */
if (setjmp(httpabort)) {
if (oldintr)
(void)signal(SIGINT, oldintr);
if (oldintp)
(void)signal(SIGPIPE, oldintp);
goto cleanup_fetch_url;
}
oldintr = signal(SIGINT, aborthttp);
bytes = 0;
hashbytes = mark;
progressmeter(-1);
/* Finally, suck down the file. */
buf = xmalloc(BUFSIZ + 1);
do {
ssize_t chunksize;
chunksize = 0;
/* read chunksize */
if (ischunked) {
if (fgets(buf, BUFSIZ, fin) == NULL) {
warnx("Unexpected EOF reading chunksize");
goto cleanup_fetch_url;
}
chunksize = strtol(buf, &ep, 16);
if (strcmp(ep, "\r\n") != 0) {
warnx("Unexpected data following chunksize");
goto cleanup_fetch_url;
}
if (debug)
fprintf(ttyout,
#ifndef NO_QUAD
"got chunksize of %qd\n",
(long long)chunksize);
#else
"got chunksize of %ld\n",
(long)chunksize);
#endif
if (chunksize == 0)
break;
}
/* transfer file or chunk */
while (1) {
struct timeval then, now, td;
off_t bufrem;
(void)gettimeofday(&then, NULL);
bufrem = rate_get ? rate_get : BUFSIZ;
while (bufrem > 0) {
len = fread(buf, sizeof(char),
ischunked ? MIN(chunksize, bufrem) : BUFSIZ,
fin);
if (len <= 0)
goto chunkdone;
bytes += len;
bufrem -= len;
if (fwrite(buf, sizeof(char), len, fout)
!= len) {
warn("Writing `%s'", savefile);
goto cleanup_fetch_url;
}
}
if (hash && !progress) {
while (bytes >= hashbytes) {
(void)putc('#', ttyout);
hashbytes += mark;
}
(void)fflush(ttyout);
}
if (ischunked) {
chunksize -= len;
if (chunksize <= 0)
goto chunkdone;
}
if (rate_get) {
while (1) {
(void)gettimeofday(&now, NULL);
timersub(&now, &then, &td);
if (td.tv_sec > 0)
break;
usleep(1000000 - td.tv_usec);
}
}
}
/* read CRLF after chunk*/
chunkdone:
if (ischunked) {
if (fgets(buf, BUFSIZ, fin) == NULL)
break;
if (strcmp(buf, "\r\n") != 0) {
warnx("Unexpected data following chunk");
goto cleanup_fetch_url;
}
}
} while (ischunked);
if (hash && !progress && bytes > 0) {
if (bytes < mark)
(void)putc('#', ttyout);
(void)putc('\n', ttyout);
}
if (ferror(fin)) {
warn("Reading file");
goto cleanup_fetch_url;
}
progressmeter(1);
(void)fflush(fout);
(void)signal(SIGINT, oldintr);
if (oldintp)
(void)signal(SIGPIPE, oldintp);
if (closefunc == fclose && mtime != -1) {
struct timeval tval[2];
(void)gettimeofday(&tval[0], NULL);
tval[1].tv_sec = mtime;
tval[1].tv_usec = 0;
(*closefunc)(fout);
fout = NULL;
if (utimes(savefile, tval) == -1) {
fprintf(ttyout,
"Can't change modification time to %s",
asctime(localtime(&mtime)));
}
}
if (bytes > 0)
ptransfer(0);
rval = 0;
goto cleanup_fetch_url;
improper:
warnx("Improper response from `%s'", host);
cleanup_fetch_url:
resetsockbufsize();
if (fin != NULL)
fclose(fin);
else if (s != -1)
close(s);
if (closefunc != NULL && fout != NULL)
(*closefunc)(fout);
if (res != NULL)
freeaddrinfo(res);
FREEPTR(savefile);
FREEPTR(user);
FREEPTR(pass);
FREEPTR(host);
FREEPTR(port);
FREEPTR(path);
FREEPTR(decodedpath);
FREEPTR(puser);
FREEPTR(ppass);
FREEPTR(buf);
FREEPTR(auth);
FREEPTR(location);
FREEPTR(message);
return (rval);
}
/*
* Abort a HTTP retrieval
*/
void
aborthttp(notused)
int notused;
{
alarmtimer(0);
fputs("\nHTTP fetch aborted.\n", ttyout);
longjmp(httpabort, 1);
}
/*
* Retrieve ftp URL or classic ftp argument using FTP.
* Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
* is still open (e.g, ftp xfer with trailing /)
*/
static int
fetch_ftp(url)
const char *url;
{
char *cp, *xargv[5], rempath[MAXPATHLEN];
char *host, *path, *dir, *file, *user, *pass;
char *port;
int dirhasglob, filehasglob, oautologin, rval, type, xargc;
url_t urltype;
host = path = dir = file = user = pass = NULL;
port = NULL;
rval = 1;
type = TYPE_I;
if (strncasecmp(url, FTP_URL, sizeof(FTP_URL) - 1) == 0) {
if ((parse_url(url, "URL", &urltype, &user, &pass,
&host, &port, &path) == -1) ||
(user != NULL && *user == '\0') ||
(pass != NULL && *pass == '\0') ||
EMPTYSTRING(host)) {
warnx("Invalid URL `%s'", url);
goto cleanup_fetch_ftp;
}
url_decode(user);
url_decode(pass);
/*
* Note: Don't url_decode(path) here. We need to keep the
* distinction between "/" and "%2F" until later.
*/
/* check for trailing ';type=[aid]' */
if (! EMPTYSTRING(path) && (cp = strrchr(path, ';')) != NULL) {
if (strcasecmp(cp, ";type=a") == 0)
type = TYPE_A;
else if (strcasecmp(cp, ";type=i") == 0)
type = TYPE_I;
else if (strcasecmp(cp, ";type=d") == 0) {
warnx(
"Directory listing via a URL is not supported");
goto cleanup_fetch_ftp;
} else {
warnx("Invalid suffix `%s' in URL `%s'", cp,
url);
goto cleanup_fetch_ftp;
}
*cp = 0;
}
} else { /* classic style `host:file' */
urltype = CLASSIC_URL_T;
host = xstrdup(url);
cp = strchr(host, ':');
if (cp != NULL) {
*cp = '\0';
path = xstrdup(cp + 1);
}
}
if (EMPTYSTRING(host))
goto cleanup_fetch_ftp;
/* Extract the file and (if present) directory name. */
dir = path;
if (! EMPTYSTRING(dir)) {
/*
* If we are dealing with classic `host:path' syntax,
* then a path of the form `/file' (resulting from
* input of the form `host:/file') means that we should
* do "CWD /" before retrieving the file. So we set
* dir="/" and file="file".
*
* But if we are dealing with URLs like
* `ftp://host/path' then a path of the form `/file'
* (resulting from a URL of the form `ftp://host//file')
* means that we should do `CWD ' (with an empty
* argument) before retrieving the file. So we set
* dir="" and file="file".
*
* If the path does not contain / at all, we set
* dir=NULL. (We get a path without any slashes if
* we are dealing with classic `host:file' or URL
* `ftp://host/file'.)
*
* In all other cases, we set dir to a string that does
* not include the final '/' that separates the dir part
* from the file part of the path. (This will be the
* empty string if and only if we are dealing with a
* path of the form `/file' resulting from an URL of the
* form `ftp://host//file'.)
*/
cp = strrchr(dir, '/');
if (cp == dir && urltype == CLASSIC_URL_T) {
file = cp + 1;
dir = "/";
} else if (cp != NULL) {
*cp++ = '\0';
file = cp;
} else {
file = dir;
dir = NULL;
}
} else
dir = NULL;
if (urltype == FTP_URL_T && file != NULL) {
url_decode(file);
/* but still don't url_decode(dir) */
}
if (debug)
fprintf(ttyout,
"fetch_ftp: user `%s' pass `%s' host %s:%s path `%s' dir `%s' file `%s'\n",
user ? user : "<null>", pass ? pass : "<null>",
host ? host : "<null>", port ? port : "<null>",
path ? path : "<null>",
dir ? dir : "<null>", file ? file : "<null>");
dirhasglob = filehasglob = 0;
if (doglob && urltype == CLASSIC_URL_T) {
if (! EMPTYSTRING(dir) && strpbrk(dir, "*?[]{}") != NULL)
dirhasglob = 1;
if (! EMPTYSTRING(file) && strpbrk(file, "*?[]{}") != NULL)
filehasglob = 1;
}
/* Set up the connection */
if (connected)
disconnect(0, NULL);
xargv[0] = __progname;
xargv[1] = host;
xargv[2] = NULL;
xargc = 2;
if (port) {
xargv[2] = port;
xargv[3] = NULL;
xargc = 3;
}
oautologin = autologin;
if (user != NULL)
autologin = 0;
setpeer(xargc, xargv);
autologin = oautologin;
if ((connected == 0) || ((connected == 1)
&& !ftp_login(host, user, pass))) {
warnx("Can't connect or login to host `%s'", host);
goto cleanup_fetch_ftp;
}
switch (type) {
case TYPE_A:
setascii(0, NULL);
break;
case TYPE_I:
setbinary(0, NULL);
break;
default:
errx(1, "fetch_ftp: unknown transfer type %d\n", type);
}
/*
* Change directories, if necessary.
*
* Note: don't use EMPTYSTRING(dir) below, because
* dir=="" means something different from dir==NULL.
*/
if (dir != NULL && !dirhasglob) {
char *nextpart;
/*
* If we are dealing with a classic `host:path' (urltype
* is CLASSIC_URL_T) then we have a raw directory
* name (not encoded in any way) and we can change
* directories in one step.
*
* If we are dealing with an `ftp://host/path' URL
* (urltype is FTP_URL_T), then RFC 1738 says we need to
* send a separate CWD command for each unescaped "/"
* in the path, and we have to interpret %hex escaping
* *after* we find the slashes. It's possible to get
* empty components here, (from multiple adjacent
* slashes in the path) and RFC 1738 says that we should
* still do `CWD ' (with a null argument) in such cases.
*
* Many ftp servers don't support `CWD ', so if there's an
* error performing that command, bail out with a descriptive
* message.
*
* Examples:
*
* host: dir="", urltype=CLASSIC_URL_T
* logged in (to default directory)
* host:file dir=NULL, urltype=CLASSIC_URL_T
* "RETR file"
* host:dir/ dir="dir", urltype=CLASSIC_URL_T
* "CWD dir", logged in
* ftp://host/ dir="", urltype=FTP_URL_T
* logged in (to default directory)
* ftp://host/dir/ dir="dir", urltype=FTP_URL_T
* "CWD dir", logged in
* ftp://host/file dir=NULL, urltype=FTP_URL_T
* "RETR file"
* ftp://host//file dir="", urltype=FTP_URL_T
* "CWD ", "RETR file"
* host:/file dir="/", urltype=CLASSIC_URL_T
* "CWD /", "RETR file"
* ftp://host///file dir="/", urltype=FTP_URL_T
* "CWD ", "CWD ", "RETR file"
* ftp://host/%2F/file dir="%2F", urltype=FTP_URL_T
* "CWD /", "RETR file"
* ftp://host/foo/file dir="foo", urltype=FTP_URL_T
* "CWD foo", "RETR file"
* ftp://host/foo/bar/file dir="foo/bar"
* "CWD foo", "CWD bar", "RETR file"
* ftp://host//foo/bar/file dir="/foo/bar"
* "CWD ", "CWD foo", "CWD bar", "RETR file"
* ftp://host/foo//bar/file dir="foo//bar"
* "CWD foo", "CWD ", "CWD bar", "RETR file"
* ftp://host/%2F/foo/bar/file dir="%2F/foo/bar"
* "CWD /", "CWD foo", "CWD bar", "RETR file"
* ftp://host/%2Ffoo/bar/file dir="%2Ffoo/bar"
* "CWD /foo", "CWD bar", "RETR file"
* ftp://host/%2Ffoo%2Fbar/file dir="%2Ffoo%2Fbar"
* "CWD /foo/bar", "RETR file"
* ftp://host/%2Ffoo%2Fbar%2Ffile dir=NULL
* "RETR /foo/bar/file"
*
* Note that we don't need `dir' after this point.
*/
do {
if (urltype == FTP_URL_T) {
nextpart = strchr(dir, '/');
if (nextpart) {
*nextpart = '\0';
nextpart++;
}
url_decode(dir);
} else
nextpart = NULL;
if (debug)
fprintf(ttyout, "dir `%s', nextpart `%s'\n",
dir ? dir : "<null>",
nextpart ? nextpart : "<null>");
if (urltype == FTP_URL_T || *dir != '\0') {
xargv[0] = "cd";
xargv[1] = dir;
xargv[2] = NULL;
dirchange = 0;
cd(2, xargv);
if (! dirchange) {
if (*dir == '\0' && code == 500)
fprintf(stderr,
"\n"
"ftp: The `CWD ' command (without a directory), which is required by\n"
" RFC 1738 to support the empty directory in the URL pathname (`//'),\n"
" conflicts with the server's conformance to RFC 959.\n"
" Try the same URL without the `//' in the URL pathname.\n"
"\n");
goto cleanup_fetch_ftp;
}
}
dir = nextpart;
} while (dir != NULL);
}
if (EMPTYSTRING(file)) {
rval = -1;
goto cleanup_fetch_ftp;
}
if (dirhasglob) {
snprintf(rempath, sizeof(rempath), "%s/%s", dir, file);
file = rempath;
}
/* Fetch the file(s). */
xargc = 2;
xargv[0] = "get";
xargv[1] = file;
xargv[2] = NULL;
if (dirhasglob || filehasglob) {
int ointeractive;
ointeractive = interactive;
interactive = 0;
xargv[0] = "mget";
mget(xargc, xargv);
interactive = ointeractive;
} else {
if (outfile == NULL) {
cp = strrchr(file, '/'); /* find savefile */
if (cp != NULL)
outfile = cp + 1;
else
outfile = file;
}
xargv[2] = (char *)outfile;
xargv[3] = NULL;
xargc++;
if (restartautofetch)
reget(xargc, xargv);
else
get(xargc, xargv);
}
if ((code / 100) == COMPLETE)
rval = 0;
cleanup_fetch_ftp:
FREEPTR(host);
FREEPTR(path);
FREEPTR(user);
FREEPTR(pass);
return (rval);
}
/*
* Retrieve the given file to outfile.
* Supports arguments of the form:
* "host:path", "ftp://host/path" if $ftpproxy, call fetch_url() else
* call fetch_ftp()
* "http://host/path" call fetch_url() to use HTTP
* "file:///path" call fetch_url() to copy
* "about:..." print a message
*
* Returns 1 on failure, 0 on completed xfer, -1 if ftp connection
* is still open (e.g, ftp xfer with trailing /)
*/
static int
go_fetch(url)
const char *url;
{
#ifndef NO_ABOUT
/*
* Check for about:*
*/
if (strncasecmp(url, ABOUT_URL, sizeof(ABOUT_URL) - 1) == 0) {
url += sizeof(ABOUT_URL) -1;
if (strcasecmp(url, "ftp") == 0) {
fprintf(ttyout, "%s\n%s\n",
"This version of ftp has been enhanced by Luke Mewburn <lukem@netbsd.org>.",
"Execute `man ftp' for more details");
} else if (strcasecmp(url, "netbsd") == 0) {
fprintf(ttyout, "%s\n%s\n",
"NetBSD is a freely available and redistributable UNIX-like operating system.",
"For more information, see http://www.netbsd.org/index.html");
} else {
fprintf(ttyout, "`%s' is an interesting topic.\n", url);
}
return (0);
}
#endif /* NO_ABOUT */
/*
* Check for file:// and http:// URLs.
*/
if (strncasecmp(url, HTTP_URL, sizeof(HTTP_URL) - 1) == 0 ||
strncasecmp(url, FILE_URL, sizeof(FILE_URL) - 1) == 0)
return (fetch_url(url, NULL, NULL, NULL));
/*
* Try FTP URL-style and host:file arguments next.
* If ftpproxy is set with an FTP URL, use fetch_url()
* Othewise, use fetch_ftp().
*/
if (ftpproxy && strncasecmp(url, FTP_URL, sizeof(FTP_URL) - 1) == 0)
return (fetch_url(url, NULL, NULL, NULL));
return (fetch_ftp(url));
}
/*
* Retrieve multiple files from the command line,
* calling go_fetch() for each file.
*
* If an ftp path has a trailing "/", the path will be cd-ed into and
* the connection remains open, and the function will return -1
* (to indicate the connection is alive).
* If an error occurs the return value will be the offset+1 in
* argv[] of the file that caused a problem (i.e, argv[x]
* returns x+1)
* Otherwise, 0 is returned if all files retrieved successfully.
*/
int
auto_fetch(argc, argv)
int argc;
char *argv[];
{
volatile int argpos;
int rval;
argpos = 0;
if (setjmp(toplevel)) {
if (connected)
disconnect(0, NULL);
return (argpos + 1);
}
(void)signal(SIGINT, (sig_t)intr);
(void)signal(SIGPIPE, (sig_t)lostpeer);
/*
* Loop through as long as there's files to fetch.
*/
for (rval = 0; (rval == 0) && (argpos < argc); argpos++) {
if (strchr(argv[argpos], ':') == NULL)
break;
redirect_loop = 0;
anonftp = 1; /* Handle "automatic" transfers. */
rval = go_fetch(argv[argpos]);
if (outfile != NULL && strcmp(outfile, "-") != 0
&& outfile[0] != '|')
outfile = NULL;
if (rval > 0)
rval = argpos + 1;
}
if (connected && rval != -1)
disconnect(0, NULL);
return (rval);
}
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